drivers/scsi/scsi_transport_iscsi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * iSCSI transport class definitions
   4  *
   5  * Copyright (C) IBM Corporation, 2004
   6  * Copyright (C) Mike Christie, 2004 - 2005
   7  * Copyright (C) Dmitry Yusupov, 2004 - 2005
   8  * Copyright (C) Alex Aizman, 2004 - 2005
   9  */
  10 #include <linux/module.h>
  11 #include <linux/mutex.h>
  12 #include <linux/slab.h>
  13 #include <linux/bsg-lib.h>
  14 #include <linux/idr.h>
  15 #include <net/tcp.h>
  16 #include <scsi/scsi.h>
  17 #include <scsi/scsi_host.h>
  18 #include <scsi/scsi_device.h>
  19 #include <scsi/scsi_transport.h>
  20 #include <scsi/scsi_transport_iscsi.h>
  21 #include <scsi/iscsi_if.h>
  22 #include <scsi/scsi_cmnd.h>
  23 #include <scsi/scsi_bsg_iscsi.h>
  24
  25 #define ISCSI_TRANSPORT_VERSION "2.0-870"
  26
  27 #define ISCSI_SEND_MAX_ALLOWED  10
  28
  29 #define CREATE_TRACE_POINTS
  30 #include <trace/events/iscsi.h>
  31
  32 /*
  33  * Export tracepoint symbols to be used by other modules.
  34  */
  35 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_conn);
  36 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_eh);
  37 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_session);
  38 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_tcp);
  39 EXPORT_TRACEPOINT_SYMBOL_GPL(iscsi_dbg_sw_tcp);
  40
  41 static int dbg_session;
  42 module_param_named(debug_session, dbg_session, int,
  43                    S_IRUGO | S_IWUSR);
  44 MODULE_PARM_DESC(debug_session,
  45                  "Turn on debugging for sessions in scsi_transport_iscsi "
  46                  "module. Set to 1 to turn on, and zero to turn off. Default "
  47                  "is off.");
  48
  49 static int dbg_conn;
  50 module_param_named(debug_conn, dbg_conn, int,
  51                    S_IRUGO | S_IWUSR);
  52 MODULE_PARM_DESC(debug_conn,
  53                  "Turn on debugging for connections in scsi_transport_iscsi "
  54                  "module. Set to 1 to turn on, and zero to turn off. Default "
  55                  "is off.");
  56
  57 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)              \
  58         do {                                                            \
  59                 if (dbg_session)                                        \
  60                         iscsi_cls_session_printk(KERN_INFO, _session,   \
  61                                                  "%s: " dbg_fmt,        \
  62                                                  __func__, ##arg);      \
  63                 iscsi_dbg_trace(trace_iscsi_dbg_trans_session,          \
  64                                 &(_session)->dev,                       \
  65                                 "%s " dbg_fmt, __func__, ##arg);        \
  66         } while (0);
  67
  68 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)                    \
  69         do {                                                            \
  70                 if (dbg_conn)                                           \
  71                         iscsi_cls_conn_printk(KERN_INFO, _conn,         \
  72                                               "%s: " dbg_fmt,           \
  73                                               __func__, ##arg);         \
  74                 iscsi_dbg_trace(trace_iscsi_dbg_trans_conn,             \
  75                                 &(_conn)->dev,                          \
  76                                 "%s " dbg_fmt, __func__, ##arg);        \
  77         } while (0);
  78
  79 struct iscsi_internal {
  80         struct scsi_transport_template t;
  81         struct iscsi_transport *iscsi_transport;
  82         struct list_head list;
  83         struct device dev;
  84
  85         struct transport_container conn_cont;
  86         struct transport_container session_cont;
  87 };
  88
  89 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  90 static struct workqueue_struct *iscsi_eh_timer_workq;
  91
  92 static DEFINE_IDA(iscsi_sess_ida);
  93 /*
  94  * list of registered transports and lock that must
  95  * be held while accessing list. The iscsi_transport_lock must
  96  * be acquired after the rx_queue_mutex.
  97  */
  98 static LIST_HEAD(iscsi_transports);
  99 static DEFINE_SPINLOCK(iscsi_transport_lock);
 100
 101 #define to_iscsi_internal(tmpl) \
 102         container_of(tmpl, struct iscsi_internal, t)
 103
 104 #define dev_to_iscsi_internal(_dev) \
 105         container_of(_dev, struct iscsi_internal, dev)
 106
 107 static void iscsi_transport_release(struct device *dev)
 108 {
 109         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 110         kfree(priv);
 111 }
 112
 113 /*
 114  * iscsi_transport_class represents the iscsi_transports that are
 115  * registered.
 116  */
 117 static struct class iscsi_transport_class = {
 118         .name = "iscsi_transport",
 119         .dev_release = iscsi_transport_release,
 120 };
 121
 122 static ssize_t
 123 show_transport_handle(struct device *dev, struct device_attribute *attr,
 124                       char *buf)
 125 {
 126         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 127         return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
 128 }
 129 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 130
 131 #define show_transport_attr(name, format)                               \
 132 static ssize_t                                                          \
 133 show_transport_##name(struct device *dev,                               \
 134                       struct device_attribute *attr,char *buf)          \
 135 {                                                                       \
 136         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 137         return sprintf(buf, format"\n", priv->iscsi_transport->name);   \
 138 }                                                                       \
 139 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 140
 141 show_transport_attr(caps, "0x%x");
 142
 143 static struct attribute *iscsi_transport_attrs[] = {
 144         &dev_attr_handle.attr,
 145         &dev_attr_caps.attr,
 146         NULL,
 147 };
 148
 149 static struct attribute_group iscsi_transport_group = {
 150         .attrs = iscsi_transport_attrs,
 151 };
 152
 153 /*
 154  * iSCSI endpoint attrs
 155  */
 156 #define iscsi_dev_to_endpoint(_dev) \
 157         container_of(_dev, struct iscsi_endpoint, dev)
 158
 159 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 160 struct device_attribute dev_attr_##_prefix##_##_name =  \
 161         __ATTR(_name,_mode,_show,_store)
 162
 163 static void iscsi_endpoint_release(struct device *dev)
 164 {
 165         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 166         kfree(ep);
 167 }
 168
 169 static struct class iscsi_endpoint_class = {
 170         .name = "iscsi_endpoint",
 171         .dev_release = iscsi_endpoint_release,
 172 };
 173
 174 static ssize_t
 175 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 176 {
 177         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 178         return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
 179 }
 180 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 181
 182 static struct attribute *iscsi_endpoint_attrs[] = {
 183         &dev_attr_ep_handle.attr,
 184         NULL,
 185 };
 186
 187 static struct attribute_group iscsi_endpoint_group = {
 188         .attrs = iscsi_endpoint_attrs,
 189 };
 190
 191 #define ISCSI_MAX_EPID -1
 192
 193 static int iscsi_match_epid(struct device *dev, const void *data)
 194 {
 195         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 196         const uint64_t *epid = data;
 197
 198         return *epid == ep->id;
 199 }
 200
 201 struct iscsi_endpoint *
 202 iscsi_create_endpoint(int dd_size)
 203 {
 204         struct device *dev;
 205         struct iscsi_endpoint *ep;
 206         uint64_t id;
 207         int err;
 208
 209         for (id = 1; id < ISCSI_MAX_EPID; id++) {
 210                 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
 211                                         iscsi_match_epid);
 212                 if (!dev)
 213                         break;
 214                 else
 215                         put_device(dev);
 216         }
 217         if (id == ISCSI_MAX_EPID) {
 218                 printk(KERN_ERR "Too many connections. Max supported %u\n",
 219                        ISCSI_MAX_EPID - 1);
 220                 return NULL;
 221         }
 222
 223         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 224         if (!ep)
 225                 return NULL;
 226
 227         ep->id = id;
 228         ep->dev.class = &iscsi_endpoint_class;
 229         dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
 230         err = device_register(&ep->dev);
 231         if (err)
 232                 goto free_ep;
 233
 234         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 235         if (err)
 236                 goto unregister_dev;
 237
 238         if (dd_size)
 239                 ep->dd_data = &ep[1];
 240         return ep;
 241
 242 unregister_dev:
 243         device_unregister(&ep->dev);
 244         return NULL;
 245
 246 free_ep:
 247         kfree(ep);
 248         return NULL;
 249 }
 250 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 251
 252 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 253 {
 254         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 255         device_unregister(&ep->dev);
 256 }
 257 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 258
 259 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 260 {
 261         struct iscsi_endpoint *ep;
 262         struct device *dev;
 263
 264         dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
 265                                 iscsi_match_epid);
 266         if (!dev)
 267                 return NULL;
 268
 269         ep = iscsi_dev_to_endpoint(dev);
 270         /*
 271          * we can drop this now because the interface will prevent
 272          * removals and lookups from racing.
 273          */
 274         put_device(dev);
 275         return ep;
 276 }
 277 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 278
 279 /*
 280  * Interface to display network param to sysfs
 281  */
 282
 283 static void iscsi_iface_release(struct device *dev)
 284 {
 285         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 286         struct device *parent = iface->dev.parent;
 287
 288         kfree(iface);
 289         put_device(parent);
 290 }
 291
 292
 293 static struct class iscsi_iface_class = {
 294         .name = "iscsi_iface",
 295         .dev_release = iscsi_iface_release,
 296 };
 297
 298 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)  \
 299 struct device_attribute dev_attr_##_prefix##_##_name =          \
 300         __ATTR(_name, _mode, _show, _store)
 301
 302 /* iface attrs show */
 303 #define iscsi_iface_attr_show(type, name, param_type, param)            \
 304 static ssize_t                                                          \
 305 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 306                      char *buf)                                         \
 307 {                                                                       \
 308         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);            \
 309         struct iscsi_transport *t = iface->transport;                   \
 310         return t->get_iface_param(iface, param_type, param, buf);       \
 311 }                                                                       \
 312
 313 #define iscsi_iface_net_attr(type, name, param)                         \
 314         iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)       \
 315 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 316
 317 #define iscsi_iface_attr(type, name, param)                             \
 318         iscsi_iface_attr_show(type, name, ISCSI_IFACE_PARAM, param)     \
 319 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 320
 321 /* generic read only ipv4 attribute */
 322 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 323 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 324 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 325 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 326 iscsi_iface_net_attr(ipv4_iface, dhcp_dns_address_en,
 327                      ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN);
 328 iscsi_iface_net_attr(ipv4_iface, dhcp_slp_da_info_en,
 329                      ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN);
 330 iscsi_iface_net_attr(ipv4_iface, tos_en, ISCSI_NET_PARAM_IPV4_TOS_EN);
 331 iscsi_iface_net_attr(ipv4_iface, tos, ISCSI_NET_PARAM_IPV4_TOS);
 332 iscsi_iface_net_attr(ipv4_iface, grat_arp_en,
 333                      ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN);
 334 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id_en,
 335                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN);
 336 iscsi_iface_net_attr(ipv4_iface, dhcp_alt_client_id,
 337                      ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID);
 338 iscsi_iface_net_attr(ipv4_iface, dhcp_req_vendor_id_en,
 339                      ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN);
 340 iscsi_iface_net_attr(ipv4_iface, dhcp_use_vendor_id_en,
 341                      ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN);
 342 iscsi_iface_net_attr(ipv4_iface, dhcp_vendor_id,
 343                      ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID);
 344 iscsi_iface_net_attr(ipv4_iface, dhcp_learn_iqn_en,
 345                      ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN);
 346 iscsi_iface_net_attr(ipv4_iface, fragment_disable,
 347                      ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE);
 348 iscsi_iface_net_attr(ipv4_iface, incoming_forwarding_en,
 349                      ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN);
 350 iscsi_iface_net_attr(ipv4_iface, ttl, ISCSI_NET_PARAM_IPV4_TTL);
 351
 352 /* generic read only ipv6 attribute */
 353 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 354 iscsi_iface_net_attr(ipv6_iface, link_local_addr,
 355                      ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 356 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 357 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 358                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 359 iscsi_iface_net_attr(ipv6_iface, link_local_autocfg,
 360                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 361 iscsi_iface_net_attr(ipv6_iface, link_local_state,
 362                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE);
 363 iscsi_iface_net_attr(ipv6_iface, router_state,
 364                      ISCSI_NET_PARAM_IPV6_ROUTER_STATE);
 365 iscsi_iface_net_attr(ipv6_iface, grat_neighbor_adv_en,
 366                      ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN);
 367 iscsi_iface_net_attr(ipv6_iface, mld_en, ISCSI_NET_PARAM_IPV6_MLD_EN);
 368 iscsi_iface_net_attr(ipv6_iface, flow_label, ISCSI_NET_PARAM_IPV6_FLOW_LABEL);
 369 iscsi_iface_net_attr(ipv6_iface, traffic_class,
 370                      ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS);
 371 iscsi_iface_net_attr(ipv6_iface, hop_limit, ISCSI_NET_PARAM_IPV6_HOP_LIMIT);
 372 iscsi_iface_net_attr(ipv6_iface, nd_reachable_tmo,
 373                      ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO);
 374 iscsi_iface_net_attr(ipv6_iface, nd_rexmit_time,
 375                      ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME);
 376 iscsi_iface_net_attr(ipv6_iface, nd_stale_tmo,
 377                      ISCSI_NET_PARAM_IPV6_ND_STALE_TMO);
 378 iscsi_iface_net_attr(ipv6_iface, dup_addr_detect_cnt,
 379                      ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT);
 380 iscsi_iface_net_attr(ipv6_iface, router_adv_link_mtu,
 381                      ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU);
 382
 383 /* common read only iface attribute */
 384 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 385 iscsi_iface_net_attr(iface, vlan_id, ISCSI_NET_PARAM_VLAN_ID);
 386 iscsi_iface_net_attr(iface, vlan_priority, ISCSI_NET_PARAM_VLAN_PRIORITY);
 387 iscsi_iface_net_attr(iface, vlan_enabled, ISCSI_NET_PARAM_VLAN_ENABLED);
 388 iscsi_iface_net_attr(iface, mtu, ISCSI_NET_PARAM_MTU);
 389 iscsi_iface_net_attr(iface, port, ISCSI_NET_PARAM_PORT);
 390 iscsi_iface_net_attr(iface, ipaddress_state, ISCSI_NET_PARAM_IPADDR_STATE);
 391 iscsi_iface_net_attr(iface, delayed_ack_en, ISCSI_NET_PARAM_DELAYED_ACK_EN);
 392 iscsi_iface_net_attr(iface, tcp_nagle_disable,
 393                      ISCSI_NET_PARAM_TCP_NAGLE_DISABLE);
 394 iscsi_iface_net_attr(iface, tcp_wsf_disable, ISCSI_NET_PARAM_TCP_WSF_DISABLE);
 395 iscsi_iface_net_attr(iface, tcp_wsf, ISCSI_NET_PARAM_TCP_WSF);
 396 iscsi_iface_net_attr(iface, tcp_timer_scale, ISCSI_NET_PARAM_TCP_TIMER_SCALE);
 397 iscsi_iface_net_attr(iface, tcp_timestamp_en, ISCSI_NET_PARAM_TCP_TIMESTAMP_EN);
 398 iscsi_iface_net_attr(iface, cache_id, ISCSI_NET_PARAM_CACHE_ID);
 399 iscsi_iface_net_attr(iface, redirect_en, ISCSI_NET_PARAM_REDIRECT_EN);
 400
 401 /* common iscsi specific settings attributes */
 402 iscsi_iface_attr(iface, def_taskmgmt_tmo, ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO);
 403 iscsi_iface_attr(iface, header_digest, ISCSI_IFACE_PARAM_HDRDGST_EN);
 404 iscsi_iface_attr(iface, data_digest, ISCSI_IFACE_PARAM_DATADGST_EN);
 405 iscsi_iface_attr(iface, immediate_data, ISCSI_IFACE_PARAM_IMM_DATA_EN);
 406 iscsi_iface_attr(iface, initial_r2t, ISCSI_IFACE_PARAM_INITIAL_R2T_EN);
 407 iscsi_iface_attr(iface, data_seq_in_order,
 408                  ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN);
 409 iscsi_iface_attr(iface, data_pdu_in_order, ISCSI_IFACE_PARAM_PDU_INORDER_EN);
 410 iscsi_iface_attr(iface, erl, ISCSI_IFACE_PARAM_ERL);
 411 iscsi_iface_attr(iface, max_recv_dlength, ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH);
 412 iscsi_iface_attr(iface, first_burst_len, ISCSI_IFACE_PARAM_FIRST_BURST);
 413 iscsi_iface_attr(iface, max_outstanding_r2t, ISCSI_IFACE_PARAM_MAX_R2T);
 414 iscsi_iface_attr(iface, max_burst_len, ISCSI_IFACE_PARAM_MAX_BURST);
 415 iscsi_iface_attr(iface, chap_auth, ISCSI_IFACE_PARAM_CHAP_AUTH_EN);
 416 iscsi_iface_attr(iface, bidi_chap, ISCSI_IFACE_PARAM_BIDI_CHAP_EN);
 417 iscsi_iface_attr(iface, discovery_auth_optional,
 418                  ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL);
 419 iscsi_iface_attr(iface, discovery_logout,
 420                  ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN);
 421 iscsi_iface_attr(iface, strict_login_comp_en,
 422                  ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN);
 423 iscsi_iface_attr(iface, initiator_name, ISCSI_IFACE_PARAM_INITIATOR_NAME);
 424
 425 static umode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 426                                           struct attribute *attr, int i)
 427 {
 428         struct device *dev = container_of(kobj, struct device, kobj);
 429         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 430         struct iscsi_transport *t = iface->transport;
 431         int param;
 432         int param_type;
 433
 434         if (attr == &dev_attr_iface_enabled.attr)
 435                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
 436         else if (attr == &dev_attr_iface_vlan_id.attr)
 437                 param = ISCSI_NET_PARAM_VLAN_ID;
 438         else if (attr == &dev_attr_iface_vlan_priority.attr)
 439                 param = ISCSI_NET_PARAM_VLAN_PRIORITY;
 440         else if (attr == &dev_attr_iface_vlan_enabled.attr)
 441                 param = ISCSI_NET_PARAM_VLAN_ENABLED;
 442         else if (attr == &dev_attr_iface_mtu.attr)
 443                 param = ISCSI_NET_PARAM_MTU;
 444         else if (attr == &dev_attr_iface_port.attr)
 445                 param = ISCSI_NET_PARAM_PORT;
 446         else if (attr == &dev_attr_iface_ipaddress_state.attr)
 447                 param = ISCSI_NET_PARAM_IPADDR_STATE;
 448         else if (attr == &dev_attr_iface_delayed_ack_en.attr)
 449                 param = ISCSI_NET_PARAM_DELAYED_ACK_EN;
 450         else if (attr == &dev_attr_iface_tcp_nagle_disable.attr)
 451                 param = ISCSI_NET_PARAM_TCP_NAGLE_DISABLE;
 452         else if (attr == &dev_attr_iface_tcp_wsf_disable.attr)
 453                 param = ISCSI_NET_PARAM_TCP_WSF_DISABLE;
 454         else if (attr == &dev_attr_iface_tcp_wsf.attr)
 455                 param = ISCSI_NET_PARAM_TCP_WSF;
 456         else if (attr == &dev_attr_iface_tcp_timer_scale.attr)
 457                 param = ISCSI_NET_PARAM_TCP_TIMER_SCALE;
 458         else if (attr == &dev_attr_iface_tcp_timestamp_en.attr)
 459                 param = ISCSI_NET_PARAM_TCP_TIMESTAMP_EN;
 460         else if (attr == &dev_attr_iface_cache_id.attr)
 461                 param = ISCSI_NET_PARAM_CACHE_ID;
 462         else if (attr == &dev_attr_iface_redirect_en.attr)
 463                 param = ISCSI_NET_PARAM_REDIRECT_EN;
 464         else if (attr == &dev_attr_iface_def_taskmgmt_tmo.attr)
 465                 param = ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO;
 466         else if (attr == &dev_attr_iface_header_digest.attr)
 467                 param = ISCSI_IFACE_PARAM_HDRDGST_EN;
 468         else if (attr == &dev_attr_iface_data_digest.attr)
 469                 param = ISCSI_IFACE_PARAM_DATADGST_EN;
 470         else if (attr == &dev_attr_iface_immediate_data.attr)
 471                 param = ISCSI_IFACE_PARAM_IMM_DATA_EN;
 472         else if (attr == &dev_attr_iface_initial_r2t.attr)
 473                 param = ISCSI_IFACE_PARAM_INITIAL_R2T_EN;
 474         else if (attr == &dev_attr_iface_data_seq_in_order.attr)
 475                 param = ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN;
 476         else if (attr == &dev_attr_iface_data_pdu_in_order.attr)
 477                 param = ISCSI_IFACE_PARAM_PDU_INORDER_EN;
 478         else if (attr == &dev_attr_iface_erl.attr)
 479                 param = ISCSI_IFACE_PARAM_ERL;
 480         else if (attr == &dev_attr_iface_max_recv_dlength.attr)
 481                 param = ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH;
 482         else if (attr == &dev_attr_iface_first_burst_len.attr)
 483                 param = ISCSI_IFACE_PARAM_FIRST_BURST;
 484         else if (attr == &dev_attr_iface_max_outstanding_r2t.attr)
 485                 param = ISCSI_IFACE_PARAM_MAX_R2T;
 486         else if (attr == &dev_attr_iface_max_burst_len.attr)
 487                 param = ISCSI_IFACE_PARAM_MAX_BURST;
 488         else if (attr == &dev_attr_iface_chap_auth.attr)
 489                 param = ISCSI_IFACE_PARAM_CHAP_AUTH_EN;
 490         else if (attr == &dev_attr_iface_bidi_chap.attr)
 491                 param = ISCSI_IFACE_PARAM_BIDI_CHAP_EN;
 492         else if (attr == &dev_attr_iface_discovery_auth_optional.attr)
 493                 param = ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL;
 494         else if (attr == &dev_attr_iface_discovery_logout.attr)
 495                 param = ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN;
 496         else if (attr == &dev_attr_iface_strict_login_comp_en.attr)
 497                 param = ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN;
 498         else if (attr == &dev_attr_iface_initiator_name.attr)
 499                 param = ISCSI_IFACE_PARAM_INITIATOR_NAME;
 500         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 501                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 502                         param = ISCSI_NET_PARAM_IPV4_ADDR;
 503                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 504                         param = ISCSI_NET_PARAM_IPV4_GW;
 505                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 506                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
 507                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 508                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
 509                 else if (attr ==
 510                          &dev_attr_ipv4_iface_dhcp_dns_address_en.attr)
 511                         param = ISCSI_NET_PARAM_IPV4_DHCP_DNS_ADDR_EN;
 512                 else if (attr ==
 513                          &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr)
 514                         param = ISCSI_NET_PARAM_IPV4_DHCP_SLP_DA_EN;
 515                 else if (attr == &dev_attr_ipv4_iface_tos_en.attr)
 516                         param = ISCSI_NET_PARAM_IPV4_TOS_EN;
 517                 else if (attr == &dev_attr_ipv4_iface_tos.attr)
 518                         param = ISCSI_NET_PARAM_IPV4_TOS;
 519                 else if (attr == &dev_attr_ipv4_iface_grat_arp_en.attr)
 520                         param = ISCSI_NET_PARAM_IPV4_GRAT_ARP_EN;
 521                 else if (attr ==
 522                          &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr)
 523                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID_EN;
 524                 else if (attr == &dev_attr_ipv4_iface_dhcp_alt_client_id.attr)
 525                         param = ISCSI_NET_PARAM_IPV4_DHCP_ALT_CLIENT_ID;
 526                 else if (attr ==
 527                          &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr)
 528                         param = ISCSI_NET_PARAM_IPV4_DHCP_REQ_VENDOR_ID_EN;
 529                 else if (attr ==
 530                          &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr)
 531                         param = ISCSI_NET_PARAM_IPV4_DHCP_USE_VENDOR_ID_EN;
 532                 else if (attr == &dev_attr_ipv4_iface_dhcp_vendor_id.attr)
 533                         param = ISCSI_NET_PARAM_IPV4_DHCP_VENDOR_ID;
 534                 else if (attr ==
 535                          &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr)
 536                         param = ISCSI_NET_PARAM_IPV4_DHCP_LEARN_IQN_EN;
 537                 else if (attr ==
 538                          &dev_attr_ipv4_iface_fragment_disable.attr)
 539                         param = ISCSI_NET_PARAM_IPV4_FRAGMENT_DISABLE;
 540                 else if (attr ==
 541                          &dev_attr_ipv4_iface_incoming_forwarding_en.attr)
 542                         param = ISCSI_NET_PARAM_IPV4_IN_FORWARD_EN;
 543                 else if (attr == &dev_attr_ipv4_iface_ttl.attr)
 544                         param = ISCSI_NET_PARAM_IPV4_TTL;
 545                 else
 546                         return 0;
 547         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 548                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 549                         param = ISCSI_NET_PARAM_IPV6_ADDR;
 550                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 551                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
 552                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 553                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
 554                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 555                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
 556                 else if (attr == &dev_attr_ipv6_iface_link_local_autocfg.attr)
 557                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
 558                 else if (attr == &dev_attr_ipv6_iface_link_local_state.attr)
 559                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_STATE;
 560                 else if (attr == &dev_attr_ipv6_iface_router_state.attr)
 561                         param = ISCSI_NET_PARAM_IPV6_ROUTER_STATE;
 562                 else if (attr ==
 563                          &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr)
 564                         param = ISCSI_NET_PARAM_IPV6_GRAT_NEIGHBOR_ADV_EN;
 565                 else if (attr == &dev_attr_ipv6_iface_mld_en.attr)
 566                         param = ISCSI_NET_PARAM_IPV6_MLD_EN;
 567                 else if (attr == &dev_attr_ipv6_iface_flow_label.attr)
 568                         param = ISCSI_NET_PARAM_IPV6_FLOW_LABEL;
 569                 else if (attr == &dev_attr_ipv6_iface_traffic_class.attr)
 570                         param = ISCSI_NET_PARAM_IPV6_TRAFFIC_CLASS;
 571                 else if (attr == &dev_attr_ipv6_iface_hop_limit.attr)
 572                         param = ISCSI_NET_PARAM_IPV6_HOP_LIMIT;
 573                 else if (attr == &dev_attr_ipv6_iface_nd_reachable_tmo.attr)
 574                         param = ISCSI_NET_PARAM_IPV6_ND_REACHABLE_TMO;
 575                 else if (attr == &dev_attr_ipv6_iface_nd_rexmit_time.attr)
 576                         param = ISCSI_NET_PARAM_IPV6_ND_REXMIT_TIME;
 577                 else if (attr == &dev_attr_ipv6_iface_nd_stale_tmo.attr)
 578                         param = ISCSI_NET_PARAM_IPV6_ND_STALE_TMO;
 579                 else if (attr == &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr)
 580                         param = ISCSI_NET_PARAM_IPV6_DUP_ADDR_DETECT_CNT;
 581                 else if (attr == &dev_attr_ipv6_iface_router_adv_link_mtu.attr)
 582                         param = ISCSI_NET_PARAM_IPV6_RTR_ADV_LINK_MTU;
 583                 else
 584                         return 0;
 585         } else {
 586                 WARN_ONCE(1, "Invalid iface attr");
 587                 return 0;
 588         }
 589
 590         switch (param) {
 591         case ISCSI_IFACE_PARAM_DEF_TASKMGMT_TMO:
 592         case ISCSI_IFACE_PARAM_HDRDGST_EN:
 593         case ISCSI_IFACE_PARAM_DATADGST_EN:
 594         case ISCSI_IFACE_PARAM_IMM_DATA_EN:
 595         case ISCSI_IFACE_PARAM_INITIAL_R2T_EN:
 596         case ISCSI_IFACE_PARAM_DATASEQ_INORDER_EN:
 597         case ISCSI_IFACE_PARAM_PDU_INORDER_EN:
 598         case ISCSI_IFACE_PARAM_ERL:
 599         case ISCSI_IFACE_PARAM_MAX_RECV_DLENGTH:
 600         case ISCSI_IFACE_PARAM_FIRST_BURST:
 601         case ISCSI_IFACE_PARAM_MAX_R2T:
 602         case ISCSI_IFACE_PARAM_MAX_BURST:
 603         case ISCSI_IFACE_PARAM_CHAP_AUTH_EN:
 604         case ISCSI_IFACE_PARAM_BIDI_CHAP_EN:
 605         case ISCSI_IFACE_PARAM_DISCOVERY_AUTH_OPTIONAL:
 606         case ISCSI_IFACE_PARAM_DISCOVERY_LOGOUT_EN:
 607         case ISCSI_IFACE_PARAM_STRICT_LOGIN_COMP_EN:
 608         case ISCSI_IFACE_PARAM_INITIATOR_NAME:
 609                 param_type = ISCSI_IFACE_PARAM;
 610                 break;
 611         default:
 612                 param_type = ISCSI_NET_PARAM;
 613         }
 614
 615         return t->attr_is_visible(param_type, param);
 616 }
 617
 618 static struct attribute *iscsi_iface_attrs[] = {
 619         &dev_attr_iface_enabled.attr,
 620         &dev_attr_iface_vlan_id.attr,
 621         &dev_attr_iface_vlan_priority.attr,
 622         &dev_attr_iface_vlan_enabled.attr,
 623         &dev_attr_ipv4_iface_ipaddress.attr,
 624         &dev_attr_ipv4_iface_gateway.attr,
 625         &dev_attr_ipv4_iface_subnet.attr,
 626         &dev_attr_ipv4_iface_bootproto.attr,
 627         &dev_attr_ipv6_iface_ipaddress.attr,
 628         &dev_attr_ipv6_iface_link_local_addr.attr,
 629         &dev_attr_ipv6_iface_router_addr.attr,
 630         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 631         &dev_attr_ipv6_iface_link_local_autocfg.attr,
 632         &dev_attr_iface_mtu.attr,
 633         &dev_attr_iface_port.attr,
 634         &dev_attr_iface_ipaddress_state.attr,
 635         &dev_attr_iface_delayed_ack_en.attr,
 636         &dev_attr_iface_tcp_nagle_disable.attr,
 637         &dev_attr_iface_tcp_wsf_disable.attr,
 638         &dev_attr_iface_tcp_wsf.attr,
 639         &dev_attr_iface_tcp_timer_scale.attr,
 640         &dev_attr_iface_tcp_timestamp_en.attr,
 641         &dev_attr_iface_cache_id.attr,
 642         &dev_attr_iface_redirect_en.attr,
 643         &dev_attr_iface_def_taskmgmt_tmo.attr,
 644         &dev_attr_iface_header_digest.attr,
 645         &dev_attr_iface_data_digest.attr,
 646         &dev_attr_iface_immediate_data.attr,
 647         &dev_attr_iface_initial_r2t.attr,
 648         &dev_attr_iface_data_seq_in_order.attr,
 649         &dev_attr_iface_data_pdu_in_order.attr,
 650         &dev_attr_iface_erl.attr,
 651         &dev_attr_iface_max_recv_dlength.attr,
 652         &dev_attr_iface_first_burst_len.attr,
 653         &dev_attr_iface_max_outstanding_r2t.attr,
 654         &dev_attr_iface_max_burst_len.attr,
 655         &dev_attr_iface_chap_auth.attr,
 656         &dev_attr_iface_bidi_chap.attr,
 657         &dev_attr_iface_discovery_auth_optional.attr,
 658         &dev_attr_iface_discovery_logout.attr,
 659         &dev_attr_iface_strict_login_comp_en.attr,
 660         &dev_attr_iface_initiator_name.attr,
 661         &dev_attr_ipv4_iface_dhcp_dns_address_en.attr,
 662         &dev_attr_ipv4_iface_dhcp_slp_da_info_en.attr,
 663         &dev_attr_ipv4_iface_tos_en.attr,
 664         &dev_attr_ipv4_iface_tos.attr,
 665         &dev_attr_ipv4_iface_grat_arp_en.attr,
 666         &dev_attr_ipv4_iface_dhcp_alt_client_id_en.attr,
 667         &dev_attr_ipv4_iface_dhcp_alt_client_id.attr,
 668         &dev_attr_ipv4_iface_dhcp_req_vendor_id_en.attr,
 669         &dev_attr_ipv4_iface_dhcp_use_vendor_id_en.attr,
 670         &dev_attr_ipv4_iface_dhcp_vendor_id.attr,
 671         &dev_attr_ipv4_iface_dhcp_learn_iqn_en.attr,
 672         &dev_attr_ipv4_iface_fragment_disable.attr,
 673         &dev_attr_ipv4_iface_incoming_forwarding_en.attr,
 674         &dev_attr_ipv4_iface_ttl.attr,
 675         &dev_attr_ipv6_iface_link_local_state.attr,
 676         &dev_attr_ipv6_iface_router_state.attr,
 677         &dev_attr_ipv6_iface_grat_neighbor_adv_en.attr,
 678         &dev_attr_ipv6_iface_mld_en.attr,
 679         &dev_attr_ipv6_iface_flow_label.attr,
 680         &dev_attr_ipv6_iface_traffic_class.attr,
 681         &dev_attr_ipv6_iface_hop_limit.attr,
 682         &dev_attr_ipv6_iface_nd_reachable_tmo.attr,
 683         &dev_attr_ipv6_iface_nd_rexmit_time.attr,
 684         &dev_attr_ipv6_iface_nd_stale_tmo.attr,
 685         &dev_attr_ipv6_iface_dup_addr_detect_cnt.attr,
 686         &dev_attr_ipv6_iface_router_adv_link_mtu.attr,
 687         NULL,
 688 };
 689
 690 static struct attribute_group iscsi_iface_group = {
 691         .attrs = iscsi_iface_attrs,
 692         .is_visible = iscsi_iface_attr_is_visible,
 693 };
 694
 695 /* convert iscsi_ipaddress_state values to ascii string name */
 696 static const struct {
 697         enum iscsi_ipaddress_state      value;
 698         char                            *name;
 699 } iscsi_ipaddress_state_names[] = {
 700         {ISCSI_IPDDRESS_STATE_UNCONFIGURED,     "Unconfigured" },
 701         {ISCSI_IPDDRESS_STATE_ACQUIRING,        "Acquiring" },
 702         {ISCSI_IPDDRESS_STATE_TENTATIVE,        "Tentative" },
 703         {ISCSI_IPDDRESS_STATE_VALID,            "Valid" },
 704         {ISCSI_IPDDRESS_STATE_DISABLING,        "Disabling" },
 705         {ISCSI_IPDDRESS_STATE_INVALID,          "Invalid" },
 706         {ISCSI_IPDDRESS_STATE_DEPRECATED,       "Deprecated" },
 707 };
 708
 709 char *iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state)
 710 {
 711         int i;
 712         char *state = NULL;
 713
 714         for (i = 0; i < ARRAY_SIZE(iscsi_ipaddress_state_names); i++) {
 715                 if (iscsi_ipaddress_state_names[i].value == port_state) {
 716                         state = iscsi_ipaddress_state_names[i].name;
 717                         break;
 718                 }
 719         }
 720         return state;
 721 }
 722 EXPORT_SYMBOL_GPL(iscsi_get_ipaddress_state_name);
 723
 724 /* convert iscsi_router_state values to ascii string name */
 725 static const struct {
 726         enum iscsi_router_state value;
 727         char                    *name;
 728 } iscsi_router_state_names[] = {
 729         {ISCSI_ROUTER_STATE_UNKNOWN,            "Unknown" },
 730         {ISCSI_ROUTER_STATE_ADVERTISED,         "Advertised" },
 731         {ISCSI_ROUTER_STATE_MANUAL,             "Manual" },
 732         {ISCSI_ROUTER_STATE_STALE,              "Stale" },
 733 };
 734
 735 char *iscsi_get_router_state_name(enum iscsi_router_state router_state)
 736 {
 737         int i;
 738         char *state = NULL;
 739
 740         for (i = 0; i < ARRAY_SIZE(iscsi_router_state_names); i++) {
 741                 if (iscsi_router_state_names[i].value == router_state) {
 742                         state = iscsi_router_state_names[i].name;
 743                         break;
 744                 }
 745         }
 746         return state;
 747 }
 748 EXPORT_SYMBOL_GPL(iscsi_get_router_state_name);
 749
 750 struct iscsi_iface *
 751 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 752                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 753 {
 754         struct iscsi_iface *iface;
 755         int err;
 756
 757         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 758         if (!iface)
 759                 return NULL;
 760
 761         iface->transport = transport;
 762         iface->iface_type = iface_type;
 763         iface->iface_num = iface_num;
 764         iface->dev.release = iscsi_iface_release;
 765         iface->dev.class = &iscsi_iface_class;
 766         /* parent reference released in iscsi_iface_release */
 767         iface->dev.parent = get_device(&shost->shost_gendev);
 768         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 769                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 770                              iface_num);
 771         else
 772                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 773                              iface_num);
 774
 775         err = device_register(&iface->dev);
 776         if (err)
 777                 goto free_iface;
 778
 779         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 780         if (err)
 781                 goto unreg_iface;
 782
 783         if (dd_size)
 784                 iface->dd_data = &iface[1];
 785         return iface;
 786
 787 unreg_iface:
 788         device_unregister(&iface->dev);
 789         return NULL;
 790
 791 free_iface:
 792         put_device(iface->dev.parent);
 793         kfree(iface);
 794         return NULL;
 795 }
 796 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 797
 798 void iscsi_destroy_iface(struct iscsi_iface *iface)
 799 {
 800         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 801         device_unregister(&iface->dev);
 802 }
 803 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 804
 805 /*
 806  * Interface to display flash node params to sysfs
 807  */
 808
 809 #define ISCSI_FLASHNODE_ATTR(_prefix, _name, _mode, _show, _store)      \
 810 struct device_attribute dev_attr_##_prefix##_##_name =                  \
 811         __ATTR(_name, _mode, _show, _store)
 812
 813 /* flash node session attrs show */
 814 #define iscsi_flashnode_sess_attr_show(type, name, param)               \
 815 static ssize_t                                                          \
 816 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 817                      char *buf)                                         \
 818 {                                                                       \
 819         struct iscsi_bus_flash_session *fnode_sess =                    \
 820                                         iscsi_dev_to_flash_session(dev);\
 821         struct iscsi_transport *t = fnode_sess->transport;              \
 822         return t->get_flashnode_param(fnode_sess, param, buf);          \
 823 }                                                                       \
 824
 825
 826 #define iscsi_flashnode_sess_attr(type, name, param)                    \
 827         iscsi_flashnode_sess_attr_show(type, name, param)               \
 828 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
 829                             show_##type##_##name, NULL);
 830
 831 /* Flash node session attributes */
 832
 833 iscsi_flashnode_sess_attr(fnode, auto_snd_tgt_disable,
 834                           ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE);
 835 iscsi_flashnode_sess_attr(fnode, discovery_session,
 836                           ISCSI_FLASHNODE_DISCOVERY_SESS);
 837 iscsi_flashnode_sess_attr(fnode, portal_type, ISCSI_FLASHNODE_PORTAL_TYPE);
 838 iscsi_flashnode_sess_attr(fnode, entry_enable, ISCSI_FLASHNODE_ENTRY_EN);
 839 iscsi_flashnode_sess_attr(fnode, immediate_data, ISCSI_FLASHNODE_IMM_DATA_EN);
 840 iscsi_flashnode_sess_attr(fnode, initial_r2t, ISCSI_FLASHNODE_INITIAL_R2T_EN);
 841 iscsi_flashnode_sess_attr(fnode, data_seq_in_order,
 842                           ISCSI_FLASHNODE_DATASEQ_INORDER);
 843 iscsi_flashnode_sess_attr(fnode, data_pdu_in_order,
 844                           ISCSI_FLASHNODE_PDU_INORDER);
 845 iscsi_flashnode_sess_attr(fnode, chap_auth, ISCSI_FLASHNODE_CHAP_AUTH_EN);
 846 iscsi_flashnode_sess_attr(fnode, discovery_logout,
 847                           ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN);
 848 iscsi_flashnode_sess_attr(fnode, bidi_chap, ISCSI_FLASHNODE_BIDI_CHAP_EN);
 849 iscsi_flashnode_sess_attr(fnode, discovery_auth_optional,
 850                           ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL);
 851 iscsi_flashnode_sess_attr(fnode, erl, ISCSI_FLASHNODE_ERL);
 852 iscsi_flashnode_sess_attr(fnode, first_burst_len, ISCSI_FLASHNODE_FIRST_BURST);
 853 iscsi_flashnode_sess_attr(fnode, def_time2wait, ISCSI_FLASHNODE_DEF_TIME2WAIT);
 854 iscsi_flashnode_sess_attr(fnode, def_time2retain,
 855                           ISCSI_FLASHNODE_DEF_TIME2RETAIN);
 856 iscsi_flashnode_sess_attr(fnode, max_outstanding_r2t, ISCSI_FLASHNODE_MAX_R2T);
 857 iscsi_flashnode_sess_attr(fnode, isid, ISCSI_FLASHNODE_ISID);
 858 iscsi_flashnode_sess_attr(fnode, tsid, ISCSI_FLASHNODE_TSID);
 859 iscsi_flashnode_sess_attr(fnode, max_burst_len, ISCSI_FLASHNODE_MAX_BURST);
 860 iscsi_flashnode_sess_attr(fnode, def_taskmgmt_tmo,
 861                           ISCSI_FLASHNODE_DEF_TASKMGMT_TMO);
 862 iscsi_flashnode_sess_attr(fnode, targetalias, ISCSI_FLASHNODE_ALIAS);
 863 iscsi_flashnode_sess_attr(fnode, targetname, ISCSI_FLASHNODE_NAME);
 864 iscsi_flashnode_sess_attr(fnode, tpgt, ISCSI_FLASHNODE_TPGT);
 865 iscsi_flashnode_sess_attr(fnode, discovery_parent_idx,
 866                           ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX);
 867 iscsi_flashnode_sess_attr(fnode, discovery_parent_type,
 868                           ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE);
 869 iscsi_flashnode_sess_attr(fnode, chap_in_idx, ISCSI_FLASHNODE_CHAP_IN_IDX);
 870 iscsi_flashnode_sess_attr(fnode, chap_out_idx, ISCSI_FLASHNODE_CHAP_OUT_IDX);
 871 iscsi_flashnode_sess_attr(fnode, username, ISCSI_FLASHNODE_USERNAME);
 872 iscsi_flashnode_sess_attr(fnode, username_in, ISCSI_FLASHNODE_USERNAME_IN);
 873 iscsi_flashnode_sess_attr(fnode, password, ISCSI_FLASHNODE_PASSWORD);
 874 iscsi_flashnode_sess_attr(fnode, password_in, ISCSI_FLASHNODE_PASSWORD_IN);
 875 iscsi_flashnode_sess_attr(fnode, is_boot_target, ISCSI_FLASHNODE_IS_BOOT_TGT);
 876
 877 static struct attribute *iscsi_flashnode_sess_attrs[] = {
 878         &dev_attr_fnode_auto_snd_tgt_disable.attr,
 879         &dev_attr_fnode_discovery_session.attr,
 880         &dev_attr_fnode_portal_type.attr,
 881         &dev_attr_fnode_entry_enable.attr,
 882         &dev_attr_fnode_immediate_data.attr,
 883         &dev_attr_fnode_initial_r2t.attr,
 884         &dev_attr_fnode_data_seq_in_order.attr,
 885         &dev_attr_fnode_data_pdu_in_order.attr,
 886         &dev_attr_fnode_chap_auth.attr,
 887         &dev_attr_fnode_discovery_logout.attr,
 888         &dev_attr_fnode_bidi_chap.attr,
 889         &dev_attr_fnode_discovery_auth_optional.attr,
 890         &dev_attr_fnode_erl.attr,
 891         &dev_attr_fnode_first_burst_len.attr,
 892         &dev_attr_fnode_def_time2wait.attr,
 893         &dev_attr_fnode_def_time2retain.attr,
 894         &dev_attr_fnode_max_outstanding_r2t.attr,
 895         &dev_attr_fnode_isid.attr,
 896         &dev_attr_fnode_tsid.attr,
 897         &dev_attr_fnode_max_burst_len.attr,
 898         &dev_attr_fnode_def_taskmgmt_tmo.attr,
 899         &dev_attr_fnode_targetalias.attr,
 900         &dev_attr_fnode_targetname.attr,
 901         &dev_attr_fnode_tpgt.attr,
 902         &dev_attr_fnode_discovery_parent_idx.attr,
 903         &dev_attr_fnode_discovery_parent_type.attr,
 904         &dev_attr_fnode_chap_in_idx.attr,
 905         &dev_attr_fnode_chap_out_idx.attr,
 906         &dev_attr_fnode_username.attr,
 907         &dev_attr_fnode_username_in.attr,
 908         &dev_attr_fnode_password.attr,
 909         &dev_attr_fnode_password_in.attr,
 910         &dev_attr_fnode_is_boot_target.attr,
 911         NULL,
 912 };
 913
 914 static umode_t iscsi_flashnode_sess_attr_is_visible(struct kobject *kobj,
 915                                                     struct attribute *attr,
 916                                                     int i)
 917 {
 918         struct device *dev = container_of(kobj, struct device, kobj);
 919         struct iscsi_bus_flash_session *fnode_sess =
 920                                                 iscsi_dev_to_flash_session(dev);
 921         struct iscsi_transport *t = fnode_sess->transport;
 922         int param;
 923
 924         if (attr == &dev_attr_fnode_auto_snd_tgt_disable.attr) {
 925                 param = ISCSI_FLASHNODE_AUTO_SND_TGT_DISABLE;
 926         } else if (attr == &dev_attr_fnode_discovery_session.attr) {
 927                 param = ISCSI_FLASHNODE_DISCOVERY_SESS;
 928         } else if (attr == &dev_attr_fnode_portal_type.attr) {
 929                 param = ISCSI_FLASHNODE_PORTAL_TYPE;
 930         } else if (attr == &dev_attr_fnode_entry_enable.attr) {
 931                 param = ISCSI_FLASHNODE_ENTRY_EN;
 932         } else if (attr == &dev_attr_fnode_immediate_data.attr) {
 933                 param = ISCSI_FLASHNODE_IMM_DATA_EN;
 934         } else if (attr == &dev_attr_fnode_initial_r2t.attr) {
 935                 param = ISCSI_FLASHNODE_INITIAL_R2T_EN;
 936         } else if (attr == &dev_attr_fnode_data_seq_in_order.attr) {
 937                 param = ISCSI_FLASHNODE_DATASEQ_INORDER;
 938         } else if (attr == &dev_attr_fnode_data_pdu_in_order.attr) {
 939                 param = ISCSI_FLASHNODE_PDU_INORDER;
 940         } else if (attr == &dev_attr_fnode_chap_auth.attr) {
 941                 param = ISCSI_FLASHNODE_CHAP_AUTH_EN;
 942         } else if (attr == &dev_attr_fnode_discovery_logout.attr) {
 943                 param = ISCSI_FLASHNODE_DISCOVERY_LOGOUT_EN;
 944         } else if (attr == &dev_attr_fnode_bidi_chap.attr) {
 945                 param = ISCSI_FLASHNODE_BIDI_CHAP_EN;
 946         } else if (attr == &dev_attr_fnode_discovery_auth_optional.attr) {
 947                 param = ISCSI_FLASHNODE_DISCOVERY_AUTH_OPTIONAL;
 948         } else if (attr == &dev_attr_fnode_erl.attr) {
 949                 param = ISCSI_FLASHNODE_ERL;
 950         } else if (attr == &dev_attr_fnode_first_burst_len.attr) {
 951                 param = ISCSI_FLASHNODE_FIRST_BURST;
 952         } else if (attr == &dev_attr_fnode_def_time2wait.attr) {
 953                 param = ISCSI_FLASHNODE_DEF_TIME2WAIT;
 954         } else if (attr == &dev_attr_fnode_def_time2retain.attr) {
 955                 param = ISCSI_FLASHNODE_DEF_TIME2RETAIN;
 956         } else if (attr == &dev_attr_fnode_max_outstanding_r2t.attr) {
 957                 param = ISCSI_FLASHNODE_MAX_R2T;
 958         } else if (attr == &dev_attr_fnode_isid.attr) {
 959                 param = ISCSI_FLASHNODE_ISID;
 960         } else if (attr == &dev_attr_fnode_tsid.attr) {
 961                 param = ISCSI_FLASHNODE_TSID;
 962         } else if (attr == &dev_attr_fnode_max_burst_len.attr) {
 963                 param = ISCSI_FLASHNODE_MAX_BURST;
 964         } else if (attr == &dev_attr_fnode_def_taskmgmt_tmo.attr) {
 965                 param = ISCSI_FLASHNODE_DEF_TASKMGMT_TMO;
 966         } else if (attr == &dev_attr_fnode_targetalias.attr) {
 967                 param = ISCSI_FLASHNODE_ALIAS;
 968         } else if (attr == &dev_attr_fnode_targetname.attr) {
 969                 param = ISCSI_FLASHNODE_NAME;
 970         } else if (attr == &dev_attr_fnode_tpgt.attr) {
 971                 param = ISCSI_FLASHNODE_TPGT;
 972         } else if (attr == &dev_attr_fnode_discovery_parent_idx.attr) {
 973                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_IDX;
 974         } else if (attr == &dev_attr_fnode_discovery_parent_type.attr) {
 975                 param = ISCSI_FLASHNODE_DISCOVERY_PARENT_TYPE;
 976         } else if (attr == &dev_attr_fnode_chap_in_idx.attr) {
 977                 param = ISCSI_FLASHNODE_CHAP_IN_IDX;
 978         } else if (attr == &dev_attr_fnode_chap_out_idx.attr) {
 979                 param = ISCSI_FLASHNODE_CHAP_OUT_IDX;
 980         } else if (attr == &dev_attr_fnode_username.attr) {
 981                 param = ISCSI_FLASHNODE_USERNAME;
 982         } else if (attr == &dev_attr_fnode_username_in.attr) {
 983                 param = ISCSI_FLASHNODE_USERNAME_IN;
 984         } else if (attr == &dev_attr_fnode_password.attr) {
 985                 param = ISCSI_FLASHNODE_PASSWORD;
 986         } else if (attr == &dev_attr_fnode_password_in.attr) {
 987                 param = ISCSI_FLASHNODE_PASSWORD_IN;
 988         } else if (attr == &dev_attr_fnode_is_boot_target.attr) {
 989                 param = ISCSI_FLASHNODE_IS_BOOT_TGT;
 990         } else {
 991                 WARN_ONCE(1, "Invalid flashnode session attr");
 992                 return 0;
 993         }
 994
 995         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
 996 }
 997
 998 static struct attribute_group iscsi_flashnode_sess_attr_group = {
 999         .attrs = iscsi_flashnode_sess_attrs,
1000         .is_visible = iscsi_flashnode_sess_attr_is_visible,
1001 };
1002
1003 static const struct attribute_group *iscsi_flashnode_sess_attr_groups[] = {
1004         &iscsi_flashnode_sess_attr_group,
1005         NULL,
1006 };
1007
1008 static void iscsi_flashnode_sess_release(struct device *dev)
1009 {
1010         struct iscsi_bus_flash_session *fnode_sess =
1011                                                 iscsi_dev_to_flash_session(dev);
1012
1013         kfree(fnode_sess->targetname);
1014         kfree(fnode_sess->targetalias);
1015         kfree(fnode_sess->portal_type);
1016         kfree(fnode_sess);
1017 }
1018
1019 static const struct device_type iscsi_flashnode_sess_dev_type = {
1020         .name = "iscsi_flashnode_sess_dev_type",
1021         .groups = iscsi_flashnode_sess_attr_groups,
1022         .release = iscsi_flashnode_sess_release,
1023 };
1024
1025 /* flash node connection attrs show */
1026 #define iscsi_flashnode_conn_attr_show(type, name, param)               \
1027 static ssize_t                                                          \
1028 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
1029                      char *buf)                                         \
1030 {                                                                       \
1031         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);\
1032         struct iscsi_bus_flash_session *fnode_sess =                    \
1033                                 iscsi_flash_conn_to_flash_session(fnode_conn);\
1034         struct iscsi_transport *t = fnode_conn->transport;              \
1035         return t->get_flashnode_param(fnode_sess, param, buf);          \
1036 }                                                                       \
1037
1038
1039 #define iscsi_flashnode_conn_attr(type, name, param)                    \
1040         iscsi_flashnode_conn_attr_show(type, name, param)               \
1041 static ISCSI_FLASHNODE_ATTR(type, name, S_IRUGO,                        \
1042                             show_##type##_##name, NULL);
1043
1044 /* Flash node connection attributes */
1045
1046 iscsi_flashnode_conn_attr(fnode, is_fw_assigned_ipv6,
1047                           ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6);
1048 iscsi_flashnode_conn_attr(fnode, header_digest, ISCSI_FLASHNODE_HDR_DGST_EN);
1049 iscsi_flashnode_conn_attr(fnode, data_digest, ISCSI_FLASHNODE_DATA_DGST_EN);
1050 iscsi_flashnode_conn_attr(fnode, snack_req, ISCSI_FLASHNODE_SNACK_REQ_EN);
1051 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_stat,
1052                           ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT);
1053 iscsi_flashnode_conn_attr(fnode, tcp_nagle_disable,
1054                           ISCSI_FLASHNODE_TCP_NAGLE_DISABLE);
1055 iscsi_flashnode_conn_attr(fnode, tcp_wsf_disable,
1056                           ISCSI_FLASHNODE_TCP_WSF_DISABLE);
1057 iscsi_flashnode_conn_attr(fnode, tcp_timer_scale,
1058                           ISCSI_FLASHNODE_TCP_TIMER_SCALE);
1059 iscsi_flashnode_conn_attr(fnode, tcp_timestamp_enable,
1060                           ISCSI_FLASHNODE_TCP_TIMESTAMP_EN);
1061 iscsi_flashnode_conn_attr(fnode, fragment_disable,
1062                           ISCSI_FLASHNODE_IP_FRAG_DISABLE);
1063 iscsi_flashnode_conn_attr(fnode, keepalive_tmo, ISCSI_FLASHNODE_KEEPALIVE_TMO);
1064 iscsi_flashnode_conn_attr(fnode, port, ISCSI_FLASHNODE_PORT);
1065 iscsi_flashnode_conn_attr(fnode, ipaddress, ISCSI_FLASHNODE_IPADDR);
1066 iscsi_flashnode_conn_attr(fnode, max_recv_dlength,
1067                           ISCSI_FLASHNODE_MAX_RECV_DLENGTH);
1068 iscsi_flashnode_conn_attr(fnode, max_xmit_dlength,
1069                           ISCSI_FLASHNODE_MAX_XMIT_DLENGTH);
1070 iscsi_flashnode_conn_attr(fnode, local_port, ISCSI_FLASHNODE_LOCAL_PORT);
1071 iscsi_flashnode_conn_attr(fnode, ipv4_tos, ISCSI_FLASHNODE_IPV4_TOS);
1072 iscsi_flashnode_conn_attr(fnode, ipv6_traffic_class, ISCSI_FLASHNODE_IPV6_TC);
1073 iscsi_flashnode_conn_attr(fnode, ipv6_flow_label,
1074                           ISCSI_FLASHNODE_IPV6_FLOW_LABEL);
1075 iscsi_flashnode_conn_attr(fnode, redirect_ipaddr,
1076                           ISCSI_FLASHNODE_REDIRECT_IPADDR);
1077 iscsi_flashnode_conn_attr(fnode, max_segment_size,
1078                           ISCSI_FLASHNODE_MAX_SEGMENT_SIZE);
1079 iscsi_flashnode_conn_attr(fnode, link_local_ipv6,
1080                           ISCSI_FLASHNODE_LINK_LOCAL_IPV6);
1081 iscsi_flashnode_conn_attr(fnode, tcp_xmit_wsf, ISCSI_FLASHNODE_TCP_XMIT_WSF);
1082 iscsi_flashnode_conn_attr(fnode, tcp_recv_wsf, ISCSI_FLASHNODE_TCP_RECV_WSF);
1083 iscsi_flashnode_conn_attr(fnode, statsn, ISCSI_FLASHNODE_STATSN);
1084 iscsi_flashnode_conn_attr(fnode, exp_statsn, ISCSI_FLASHNODE_EXP_STATSN);
1085
1086 static struct attribute *iscsi_flashnode_conn_attrs[] = {
1087         &dev_attr_fnode_is_fw_assigned_ipv6.attr,
1088         &dev_attr_fnode_header_digest.attr,
1089         &dev_attr_fnode_data_digest.attr,
1090         &dev_attr_fnode_snack_req.attr,
1091         &dev_attr_fnode_tcp_timestamp_stat.attr,
1092         &dev_attr_fnode_tcp_nagle_disable.attr,
1093         &dev_attr_fnode_tcp_wsf_disable.attr,
1094         &dev_attr_fnode_tcp_timer_scale.attr,
1095         &dev_attr_fnode_tcp_timestamp_enable.attr,
1096         &dev_attr_fnode_fragment_disable.attr,
1097         &dev_attr_fnode_max_recv_dlength.attr,
1098         &dev_attr_fnode_max_xmit_dlength.attr,
1099         &dev_attr_fnode_keepalive_tmo.attr,
1100         &dev_attr_fnode_port.attr,
1101         &dev_attr_fnode_ipaddress.attr,
1102         &dev_attr_fnode_redirect_ipaddr.attr,
1103         &dev_attr_fnode_max_segment_size.attr,
1104         &dev_attr_fnode_local_port.attr,
1105         &dev_attr_fnode_ipv4_tos.attr,
1106         &dev_attr_fnode_ipv6_traffic_class.attr,
1107         &dev_attr_fnode_ipv6_flow_label.attr,
1108         &dev_attr_fnode_link_local_ipv6.attr,
1109         &dev_attr_fnode_tcp_xmit_wsf.attr,
1110         &dev_attr_fnode_tcp_recv_wsf.attr,
1111         &dev_attr_fnode_statsn.attr,
1112         &dev_attr_fnode_exp_statsn.attr,
1113         NULL,
1114 };
1115
1116 static umode_t iscsi_flashnode_conn_attr_is_visible(struct kobject *kobj,
1117                                                     struct attribute *attr,
1118                                                     int i)
1119 {
1120         struct device *dev = container_of(kobj, struct device, kobj);
1121         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1122         struct iscsi_transport *t = fnode_conn->transport;
1123         int param;
1124
1125         if (attr == &dev_attr_fnode_is_fw_assigned_ipv6.attr) {
1126                 param = ISCSI_FLASHNODE_IS_FW_ASSIGNED_IPV6;
1127         } else if (attr == &dev_attr_fnode_header_digest.attr) {
1128                 param = ISCSI_FLASHNODE_HDR_DGST_EN;
1129         } else if (attr == &dev_attr_fnode_data_digest.attr) {
1130                 param = ISCSI_FLASHNODE_DATA_DGST_EN;
1131         } else if (attr == &dev_attr_fnode_snack_req.attr) {
1132                 param = ISCSI_FLASHNODE_SNACK_REQ_EN;
1133         } else if (attr == &dev_attr_fnode_tcp_timestamp_stat.attr) {
1134                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_STAT;
1135         } else if (attr == &dev_attr_fnode_tcp_nagle_disable.attr) {
1136                 param = ISCSI_FLASHNODE_TCP_NAGLE_DISABLE;
1137         } else if (attr == &dev_attr_fnode_tcp_wsf_disable.attr) {
1138                 param = ISCSI_FLASHNODE_TCP_WSF_DISABLE;
1139         } else if (attr == &dev_attr_fnode_tcp_timer_scale.attr) {
1140                 param = ISCSI_FLASHNODE_TCP_TIMER_SCALE;
1141         } else if (attr == &dev_attr_fnode_tcp_timestamp_enable.attr) {
1142                 param = ISCSI_FLASHNODE_TCP_TIMESTAMP_EN;
1143         } else if (attr == &dev_attr_fnode_fragment_disable.attr) {
1144                 param = ISCSI_FLASHNODE_IP_FRAG_DISABLE;
1145         } else if (attr == &dev_attr_fnode_max_recv_dlength.attr) {
1146                 param = ISCSI_FLASHNODE_MAX_RECV_DLENGTH;
1147         } else if (attr == &dev_attr_fnode_max_xmit_dlength.attr) {
1148                 param = ISCSI_FLASHNODE_MAX_XMIT_DLENGTH;
1149         } else if (attr == &dev_attr_fnode_keepalive_tmo.attr) {
1150                 param = ISCSI_FLASHNODE_KEEPALIVE_TMO;
1151         } else if (attr == &dev_attr_fnode_port.attr) {
1152                 param = ISCSI_FLASHNODE_PORT;
1153         } else if (attr == &dev_attr_fnode_ipaddress.attr) {
1154                 param = ISCSI_FLASHNODE_IPADDR;
1155         } else if (attr == &dev_attr_fnode_redirect_ipaddr.attr) {
1156                 param = ISCSI_FLASHNODE_REDIRECT_IPADDR;
1157         } else if (attr == &dev_attr_fnode_max_segment_size.attr) {
1158                 param = ISCSI_FLASHNODE_MAX_SEGMENT_SIZE;
1159         } else if (attr == &dev_attr_fnode_local_port.attr) {
1160                 param = ISCSI_FLASHNODE_LOCAL_PORT;
1161         } else if (attr == &dev_attr_fnode_ipv4_tos.attr) {
1162                 param = ISCSI_FLASHNODE_IPV4_TOS;
1163         } else if (attr == &dev_attr_fnode_ipv6_traffic_class.attr) {
1164                 param = ISCSI_FLASHNODE_IPV6_TC;
1165         } else if (attr == &dev_attr_fnode_ipv6_flow_label.attr) {
1166                 param = ISCSI_FLASHNODE_IPV6_FLOW_LABEL;
1167         } else if (attr == &dev_attr_fnode_link_local_ipv6.attr) {
1168                 param = ISCSI_FLASHNODE_LINK_LOCAL_IPV6;
1169         } else if (attr == &dev_attr_fnode_tcp_xmit_wsf.attr) {
1170                 param = ISCSI_FLASHNODE_TCP_XMIT_WSF;
1171         } else if (attr == &dev_attr_fnode_tcp_recv_wsf.attr) {
1172                 param = ISCSI_FLASHNODE_TCP_RECV_WSF;
1173         } else if (attr == &dev_attr_fnode_statsn.attr) {
1174                 param = ISCSI_FLASHNODE_STATSN;
1175         } else if (attr == &dev_attr_fnode_exp_statsn.attr) {
1176                 param = ISCSI_FLASHNODE_EXP_STATSN;
1177         } else {
1178                 WARN_ONCE(1, "Invalid flashnode connection attr");
1179                 return 0;
1180         }
1181
1182         return t->attr_is_visible(ISCSI_FLASHNODE_PARAM, param);
1183 }
1184
1185 static struct attribute_group iscsi_flashnode_conn_attr_group = {
1186         .attrs = iscsi_flashnode_conn_attrs,
1187         .is_visible = iscsi_flashnode_conn_attr_is_visible,
1188 };
1189
1190 static const struct attribute_group *iscsi_flashnode_conn_attr_groups[] = {
1191         &iscsi_flashnode_conn_attr_group,
1192         NULL,
1193 };
1194
1195 static void iscsi_flashnode_conn_release(struct device *dev)
1196 {
1197         struct iscsi_bus_flash_conn *fnode_conn = iscsi_dev_to_flash_conn(dev);
1198
1199         kfree(fnode_conn->ipaddress);
1200         kfree(fnode_conn->redirect_ipaddr);
1201         kfree(fnode_conn->link_local_ipv6_addr);
1202         kfree(fnode_conn);
1203 }
1204
1205 static const struct device_type iscsi_flashnode_conn_dev_type = {
1206         .name = "iscsi_flashnode_conn_dev_type",
1207         .groups = iscsi_flashnode_conn_attr_groups,
1208         .release = iscsi_flashnode_conn_release,
1209 };
1210
1211 static struct bus_type iscsi_flashnode_bus;
1212
1213 int iscsi_flashnode_bus_match(struct device *dev,
1214                                      struct device_driver *drv)
1215 {
1216         if (dev->bus == &iscsi_flashnode_bus)
1217                 return 1;
1218         return 0;
1219 }
1220 EXPORT_SYMBOL_GPL(iscsi_flashnode_bus_match);
1221
1222 static struct bus_type iscsi_flashnode_bus = {
1223         .name = "iscsi_flashnode",
1224         .match = &iscsi_flashnode_bus_match,
1225 };
1226
1227 /**
1228  * iscsi_create_flashnode_sess - Add flashnode session entry in sysfs
1229  * @shost: pointer to host data
1230  * @index: index of flashnode to add in sysfs
1231  * @transport: pointer to transport data
1232  * @dd_size: total size to allocate
1233  *
1234  * Adds a sysfs entry for the flashnode session attributes
1235  *
1236  * Returns:
1237  *  pointer to allocated flashnode sess on success
1238  *  %NULL on failure
1239  */
1240 struct iscsi_bus_flash_session *
1241 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index,
1242                             struct iscsi_transport *transport,
1243                             int dd_size)
1244 {
1245         struct iscsi_bus_flash_session *fnode_sess;
1246         int err;
1247
1248         fnode_sess = kzalloc(sizeof(*fnode_sess) + dd_size, GFP_KERNEL);
1249         if (!fnode_sess)
1250                 return NULL;
1251
1252         fnode_sess->transport = transport;
1253         fnode_sess->target_id = index;
1254         fnode_sess->dev.type = &iscsi_flashnode_sess_dev_type;
1255         fnode_sess->dev.bus = &iscsi_flashnode_bus;
1256         fnode_sess->dev.parent = &shost->shost_gendev;
1257         dev_set_name(&fnode_sess->dev, "flashnode_sess-%u:%u",
1258                      shost->host_no, index);
1259
1260         err = device_register(&fnode_sess->dev);
1261         if (err)
1262                 goto free_fnode_sess;
1263
1264         if (dd_size)
1265                 fnode_sess->dd_data = &fnode_sess[1];
1266
1267         return fnode_sess;
1268
1269 free_fnode_sess:
1270         kfree(fnode_sess);
1271         return NULL;
1272 }
1273 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_sess);
1274
1275 /**
1276  * iscsi_create_flashnode_conn - Add flashnode conn entry in sysfs
1277  * @shost: pointer to host data
1278  * @fnode_sess: pointer to the parent flashnode session entry
1279  * @transport: pointer to transport data
1280  * @dd_size: total size to allocate
1281  *
1282  * Adds a sysfs entry for the flashnode connection attributes
1283  *
1284  * Returns:
1285  *  pointer to allocated flashnode conn on success
1286  *  %NULL on failure
1287  */
1288 struct iscsi_bus_flash_conn *
1289 iscsi_create_flashnode_conn(struct Scsi_Host *shost,
1290                             struct iscsi_bus_flash_session *fnode_sess,
1291                             struct iscsi_transport *transport,
1292                             int dd_size)
1293 {
1294         struct iscsi_bus_flash_conn *fnode_conn;
1295         int err;
1296
1297         fnode_conn = kzalloc(sizeof(*fnode_conn) + dd_size, GFP_KERNEL);
1298         if (!fnode_conn)
1299                 return NULL;
1300
1301         fnode_conn->transport = transport;
1302         fnode_conn->dev.type = &iscsi_flashnode_conn_dev_type;
1303         fnode_conn->dev.bus = &iscsi_flashnode_bus;
1304         fnode_conn->dev.parent = &fnode_sess->dev;
1305         dev_set_name(&fnode_conn->dev, "flashnode_conn-%u:%u:0",
1306                      shost->host_no, fnode_sess->target_id);
1307
1308         err = device_register(&fnode_conn->dev);
1309         if (err)
1310                 goto free_fnode_conn;
1311
1312         if (dd_size)
1313                 fnode_conn->dd_data = &fnode_conn[1];
1314
1315         return fnode_conn;
1316
1317 free_fnode_conn:
1318         kfree(fnode_conn);
1319         return NULL;
1320 }
1321 EXPORT_SYMBOL_GPL(iscsi_create_flashnode_conn);
1322
1323 /**
1324  * iscsi_is_flashnode_conn_dev - verify passed device is to be flashnode conn
1325  * @dev: device to verify
1326  * @data: pointer to data containing value to use for verification
1327  *
1328  * Verifies if the passed device is flashnode conn device
1329  *
1330  * Returns:
1331  *  1 on success
1332  *  0 on failure
1333  */
1334 static int iscsi_is_flashnode_conn_dev(struct device *dev, void *data)
1335 {
1336         return dev->bus == &iscsi_flashnode_bus;
1337 }
1338
1339 static int iscsi_destroy_flashnode_conn(struct iscsi_bus_flash_conn *fnode_conn)
1340 {
1341         device_unregister(&fnode_conn->dev);
1342         return 0;
1343 }
1344
1345 static int flashnode_match_index(struct device *dev, void *data)
1346 {
1347         struct iscsi_bus_flash_session *fnode_sess = NULL;
1348         int ret = 0;
1349
1350         if (!iscsi_flashnode_bus_match(dev, NULL))
1351                 goto exit_match_index;
1352
1353         fnode_sess = iscsi_dev_to_flash_session(dev);
1354         ret = (fnode_sess->target_id == *((int *)data)) ? 1 : 0;
1355
1356 exit_match_index:
1357         return ret;
1358 }
1359
1360 /**
1361  * iscsi_get_flashnode_by_index -finds flashnode session entry by index
1362  * @shost: pointer to host data
1363  * @idx: index to match
1364  *
1365  * Finds the flashnode session object for the passed index
1366  *
1367  * Returns:
1368  *  pointer to found flashnode session object on success
1369  *  %NULL on failure
1370  */
1371 static struct iscsi_bus_flash_session *
1372 iscsi_get_flashnode_by_index(struct Scsi_Host *shost, uint32_t idx)
1373 {
1374         struct iscsi_bus_flash_session *fnode_sess = NULL;
1375         struct device *dev;
1376
1377         dev = device_find_child(&shost->shost_gendev, &idx,
1378                                 flashnode_match_index);
1379         if (dev)
1380                 fnode_sess = iscsi_dev_to_flash_session(dev);
1381
1382         return fnode_sess;
1383 }
1384
1385 /**
1386  * iscsi_find_flashnode_sess - finds flashnode session entry
1387  * @shost: pointer to host data
1388  * @data: pointer to data containing value to use for comparison
1389  * @fn: function pointer that does actual comparison
1390  *
1391  * Finds the flashnode session object comparing the data passed using logic
1392  * defined in passed function pointer
1393  *
1394  * Returns:
1395  *  pointer to found flashnode session device object on success
1396  *  %NULL on failure
1397  */
1398 struct device *
1399 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data,
1400                           int (*fn)(struct device *dev, void *data))
1401 {
1402         return device_find_child(&shost->shost_gendev, data, fn);
1403 }
1404 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_sess);
1405
1406 /**
1407  * iscsi_find_flashnode_conn - finds flashnode connection entry
1408  * @fnode_sess: pointer to parent flashnode session entry
1409  *
1410  * Finds the flashnode connection object comparing the data passed using logic
1411  * defined in passed function pointer
1412  *
1413  * Returns:
1414  *  pointer to found flashnode connection device object on success
1415  *  %NULL on failure
1416  */
1417 struct device *
1418 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess)
1419 {
1420         return device_find_child(&fnode_sess->dev, NULL,
1421                                  iscsi_is_flashnode_conn_dev);
1422 }
1423 EXPORT_SYMBOL_GPL(iscsi_find_flashnode_conn);
1424
1425 static int iscsi_iter_destroy_flashnode_conn_fn(struct device *dev, void *data)
1426 {
1427         if (!iscsi_is_flashnode_conn_dev(dev, NULL))
1428                 return 0;
1429
1430         return iscsi_destroy_flashnode_conn(iscsi_dev_to_flash_conn(dev));
1431 }
1432
1433 /**
1434  * iscsi_destroy_flashnode_sess - destroy flashnode session entry
1435  * @fnode_sess: pointer to flashnode session entry to be destroyed
1436  *
1437  * Deletes the flashnode session entry and all children flashnode connection
1438  * entries from sysfs
1439  */
1440 void iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess)
1441 {
1442         int err;
1443
1444         err = device_for_each_child(&fnode_sess->dev, NULL,
1445                                     iscsi_iter_destroy_flashnode_conn_fn);
1446         if (err)
1447                 pr_err("Could not delete all connections for %s. Error %d.\n",
1448                        fnode_sess->dev.kobj.name, err);
1449
1450         device_unregister(&fnode_sess->dev);
1451 }
1452 EXPORT_SYMBOL_GPL(iscsi_destroy_flashnode_sess);
1453
1454 static int iscsi_iter_destroy_flashnode_fn(struct device *dev, void *data)
1455 {
1456         if (!iscsi_flashnode_bus_match(dev, NULL))
1457                 return 0;
1458
1459         iscsi_destroy_flashnode_sess(iscsi_dev_to_flash_session(dev));
1460         return 0;
1461 }
1462
1463 /**
1464  * iscsi_destroy_all_flashnode - destroy all flashnode session entries
1465  * @shost: pointer to host data
1466  *
1467  * Destroys all the flashnode session entries and all corresponding children
1468  * flashnode connection entries from sysfs
1469  */
1470 void iscsi_destroy_all_flashnode(struct Scsi_Host *shost)
1471 {
1472         device_for_each_child(&shost->shost_gendev, NULL,
1473                               iscsi_iter_destroy_flashnode_fn);
1474 }
1475 EXPORT_SYMBOL_GPL(iscsi_destroy_all_flashnode);
1476
1477 /*
1478  * BSG support
1479  */
1480 /**
1481  * iscsi_bsg_host_dispatch - Dispatch command to LLD.
1482  * @job: bsg job to be processed
1483  */
1484 static int iscsi_bsg_host_dispatch(struct bsg_job *job)
1485 {
1486         struct Scsi_Host *shost = iscsi_job_to_shost(job);
1487         struct iscsi_bsg_request *req = job->request;
1488         struct iscsi_bsg_reply *reply = job->reply;
1489         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1490         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
1491         int ret;
1492
1493         /* check if we have the msgcode value at least */
1494         if (job->request_len < sizeof(uint32_t)) {
1495                 ret = -ENOMSG;
1496                 goto fail_host_msg;
1497         }
1498
1499         /* Validate the host command */
1500         switch (req->msgcode) {
1501         case ISCSI_BSG_HST_VENDOR:
1502                 cmdlen += sizeof(struct iscsi_bsg_host_vendor);
1503                 if ((shost->hostt->vendor_id == 0L) ||
1504                     (req->rqst_data.h_vendor.vendor_id !=
1505                         shost->hostt->vendor_id)) {
1506                         ret = -ESRCH;
1507                         goto fail_host_msg;
1508                 }
1509                 break;
1510         default:
1511                 ret = -EBADR;
1512                 goto fail_host_msg;
1513         }
1514
1515         /* check if we really have all the request data needed */
1516         if (job->request_len < cmdlen) {
1517                 ret = -ENOMSG;
1518                 goto fail_host_msg;
1519         }
1520
1521         ret = i->iscsi_transport->bsg_request(job);
1522         if (!ret)
1523                 return 0;
1524
1525 fail_host_msg:
1526         /* return the errno failure code as the only status */
1527         BUG_ON(job->reply_len < sizeof(uint32_t));
1528         reply->reply_payload_rcv_len = 0;
1529         reply->result = ret;
1530         job->reply_len = sizeof(uint32_t);
1531         bsg_job_done(job, ret, 0);
1532         return 0;
1533 }
1534
1535 /**
1536  * iscsi_bsg_host_add - Create and add the bsg hooks to receive requests
1537  * @shost: shost for iscsi_host
1538  * @ihost: iscsi_cls_host adding the structures to
1539  */
1540 static int
1541 iscsi_bsg_host_add(struct Scsi_Host *shost, struct iscsi_cls_host *ihost)
1542 {
1543         struct device *dev = &shost->shost_gendev;
1544         struct iscsi_internal *i = to_iscsi_internal(shost->transportt);
1545         struct request_queue *q;
1546         char bsg_name[20];
1547
1548         if (!i->iscsi_transport->bsg_request)
1549                 return -ENOTSUPP;
1550
1551         snprintf(bsg_name, sizeof(bsg_name), "iscsi_host%d", shost->host_no);
1552         q = bsg_setup_queue(dev, bsg_name, iscsi_bsg_host_dispatch, NULL, 0);
1553         if (IS_ERR(q)) {
1554                 shost_printk(KERN_ERR, shost, "bsg interface failed to "
1555                              "initialize - no request queue\n");
1556                 return PTR_ERR(q);
1557         }
1558         __scsi_init_queue(shost, q);
1559
1560         ihost->bsg_q = q;
1561         return 0;
1562 }
1563
1564 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
1565                             struct device *cdev)
1566 {
1567         struct Scsi_Host *shost = dev_to_shost(dev);
1568         struct iscsi_cls_host *ihost = shost->shost_data;
1569
1570         memset(ihost, 0, sizeof(*ihost));
1571         atomic_set(&ihost->nr_scans, 0);
1572         mutex_init(&ihost->mutex);
1573
1574         iscsi_bsg_host_add(shost, ihost);
1575         /* ignore any bsg add error - we just can't do sgio */
1576
1577         return 0;
1578 }
1579
1580 static int iscsi_remove_host(struct transport_container *tc,
1581                              struct device *dev, struct device *cdev)
1582 {
1583         struct Scsi_Host *shost = dev_to_shost(dev);
1584         struct iscsi_cls_host *ihost = shost->shost_data;
1585
1586         bsg_remove_queue(ihost->bsg_q);
1587         return 0;
1588 }
1589
1590 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
1591                                "iscsi_host",
1592                                iscsi_setup_host,
1593                                iscsi_remove_host,
1594                                NULL);
1595
1596 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
1597                                "iscsi_session",
1598                                NULL,
1599                                NULL,
1600                                NULL);
1601
1602 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
1603                                "iscsi_connection",
1604                                NULL,
1605                                NULL,
1606                                NULL);
1607
1608 static struct sock *nls;
1609 static DEFINE_MUTEX(rx_queue_mutex);
1610
1611 static LIST_HEAD(sesslist);
1612 static DEFINE_SPINLOCK(sesslock);
1613 static LIST_HEAD(connlist);
1614 static DEFINE_SPINLOCK(connlock);
1615
1616 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
1617 {
1618         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
1619         return sess->sid;
1620 }
1621
1622 /*
1623  * Returns the matching session to a given sid
1624  */
1625 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
1626 {
1627         unsigned long flags;
1628         struct iscsi_cls_session *sess;
1629
1630         spin_lock_irqsave(&sesslock, flags);
1631         list_for_each_entry(sess, &sesslist, sess_list) {
1632                 if (sess->sid == sid) {
1633                         spin_unlock_irqrestore(&sesslock, flags);
1634                         return sess;
1635                 }
1636         }
1637         spin_unlock_irqrestore(&sesslock, flags);
1638         return NULL;
1639 }
1640
1641 /*
1642  * Returns the matching connection to a given sid / cid tuple
1643  */
1644 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
1645 {
1646         unsigned long flags;
1647         struct iscsi_cls_conn *conn;
1648
1649         spin_lock_irqsave(&connlock, flags);
1650         list_for_each_entry(conn, &connlist, conn_list) {
1651                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
1652                         spin_unlock_irqrestore(&connlock, flags);
1653                         return conn;
1654                 }
1655         }
1656         spin_unlock_irqrestore(&connlock, flags);
1657         return NULL;
1658 }
1659
1660 /*
1661  * The following functions can be used by LLDs that allocate
1662  * their own scsi_hosts or by software iscsi LLDs
1663  */
1664 static struct {
1665         int value;
1666         char *name;
1667 } iscsi_session_state_names[] = {
1668         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
1669         { ISCSI_SESSION_FAILED,         "FAILED" },
1670         { ISCSI_SESSION_FREE,           "FREE" },
1671 };
1672
1673 static const char *iscsi_session_state_name(int state)
1674 {
1675         int i;
1676         char *name = NULL;
1677
1678         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
1679                 if (iscsi_session_state_names[i].value == state) {
1680                         name = iscsi_session_state_names[i].name;
1681                         break;
1682                 }
1683         }
1684         return name;
1685 }
1686
1687 int iscsi_session_chkready(struct iscsi_cls_session *session)
1688 {
1689         unsigned long flags;
1690         int err;
1691
1692         spin_lock_irqsave(&session->lock, flags);
1693         switch (session->state) {
1694         case ISCSI_SESSION_LOGGED_IN:
1695                 err = 0;
1696                 break;
1697         case ISCSI_SESSION_FAILED:
1698                 err = DID_IMM_RETRY << 16;
1699                 break;
1700         case ISCSI_SESSION_FREE:
1701                 err = DID_TRANSPORT_FAILFAST << 16;
1702                 break;
1703         default:
1704                 err = DID_NO_CONNECT << 16;
1705                 break;
1706         }
1707         spin_unlock_irqrestore(&session->lock, flags);
1708         return err;
1709 }
1710 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
1711
1712 int iscsi_is_session_online(struct iscsi_cls_session *session)
1713 {
1714         unsigned long flags;
1715         int ret = 0;
1716
1717         spin_lock_irqsave(&session->lock, flags);
1718         if (session->state == ISCSI_SESSION_LOGGED_IN)
1719                 ret = 1;
1720         spin_unlock_irqrestore(&session->lock, flags);
1721         return ret;
1722 }
1723 EXPORT_SYMBOL_GPL(iscsi_is_session_online);
1724
1725 static void iscsi_session_release(struct device *dev)
1726 {
1727         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
1728         struct Scsi_Host *shost;
1729
1730         shost = iscsi_session_to_shost(session);
1731         scsi_host_put(shost);
1732         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
1733         kfree(session);
1734 }
1735
1736 int iscsi_is_session_dev(const struct device *dev)
1737 {
1738         return dev->release == iscsi_session_release;
1739 }
1740 EXPORT_SYMBOL_GPL(iscsi_is_session_dev);
1741
1742 static int iscsi_iter_session_fn(struct device *dev, void *data)
1743 {
1744         void (* fn) (struct iscsi_cls_session *) = data;
1745
1746         if (!iscsi_is_session_dev(dev))
1747                 return 0;
1748         fn(iscsi_dev_to_session(dev));
1749         return 0;
1750 }
1751
1752 void iscsi_host_for_each_session(struct Scsi_Host *shost,
1753                                  void (*fn)(struct iscsi_cls_session *))
1754 {
1755         device_for_each_child(&shost->shost_gendev, fn,
1756                               iscsi_iter_session_fn);
1757 }
1758 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
1759
1760 /**
1761  * iscsi_scan_finished - helper to report when running scans are done
1762  * @shost: scsi host
1763  * @time: scan run time
1764  *
1765  * This function can be used by drives like qla4xxx to report to the scsi
1766  * layer when the scans it kicked off at module load time are done.
1767  */
1768 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
1769 {
1770         struct iscsi_cls_host *ihost = shost->shost_data;
1771         /*
1772          * qla4xxx will have kicked off some session unblocks before calling
1773          * scsi_scan_host, so just wait for them to complete.
1774          */
1775         return !atomic_read(&ihost->nr_scans);
1776 }
1777 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
1778
1779 struct iscsi_scan_data {
1780         unsigned int channel;
1781         unsigned int id;
1782         u64 lun;
1783         enum scsi_scan_mode rescan;
1784 };
1785
1786 static int iscsi_user_scan_session(struct device *dev, void *data)
1787 {
1788         struct iscsi_scan_data *scan_data = data;
1789         struct iscsi_cls_session *session;
1790         struct Scsi_Host *shost;
1791         struct iscsi_cls_host *ihost;
1792         unsigned long flags;
1793         unsigned int id;
1794
1795         if (!iscsi_is_session_dev(dev))
1796                 return 0;
1797
1798         session = iscsi_dev_to_session(dev);
1799
1800         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
1801
1802         shost = iscsi_session_to_shost(session);
1803         ihost = shost->shost_data;
1804
1805         mutex_lock(&ihost->mutex);
1806         spin_lock_irqsave(&session->lock, flags);
1807         if (session->state != ISCSI_SESSION_LOGGED_IN) {
1808                 spin_unlock_irqrestore(&session->lock, flags);
1809                 goto user_scan_exit;
1810         }
1811         id = session->target_id;
1812         spin_unlock_irqrestore(&session->lock, flags);
1813
1814         if (id != ISCSI_MAX_TARGET) {
1815                 if ((scan_data->channel == SCAN_WILD_CARD ||
1816                      scan_data->channel == 0) &&
1817                     (scan_data->id == SCAN_WILD_CARD ||
1818                      scan_data->id == id))
1819                         scsi_scan_target(&session->dev, 0, id,
1820                                          scan_data->lun, scan_data->rescan);
1821         }
1822
1823 user_scan_exit:
1824         mutex_unlock(&ihost->mutex);
1825         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
1826         return 0;
1827 }
1828
1829 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
1830                            uint id, u64 lun)
1831 {
1832         struct iscsi_scan_data scan_data;
1833
1834         scan_data.channel = channel;
1835         scan_data.id = id;
1836         scan_data.lun = lun;
1837         scan_data.rescan = SCSI_SCAN_MANUAL;
1838
1839         return device_for_each_child(&shost->shost_gendev, &scan_data,
1840                                      iscsi_user_scan_session);
1841 }
1842
1843 static void iscsi_scan_session(struct work_struct *work)
1844 {
1845         struct iscsi_cls_session *session =
1846                         container_of(work, struct iscsi_cls_session, scan_work);
1847         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1848         struct iscsi_cls_host *ihost = shost->shost_data;
1849         struct iscsi_scan_data scan_data;
1850
1851         scan_data.channel = 0;
1852         scan_data.id = SCAN_WILD_CARD;
1853         scan_data.lun = SCAN_WILD_CARD;
1854         scan_data.rescan = SCSI_SCAN_RESCAN;
1855
1856         iscsi_user_scan_session(&session->dev, &scan_data);
1857         atomic_dec(&ihost->nr_scans);
1858 }
1859
1860 /**
1861  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
1862  * @cmd: scsi cmd passed to scsi eh handler
1863  *
1864  * If the session is down this function will wait for the recovery
1865  * timer to fire or for the session to be logged back in. If the
1866  * recovery timer fires then FAST_IO_FAIL is returned. The caller
1867  * should pass this error value to the scsi eh.
1868  */
1869 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
1870 {
1871         struct iscsi_cls_session *session =
1872                         starget_to_session(scsi_target(cmd->device));
1873         unsigned long flags;
1874         int ret = 0;
1875
1876         spin_lock_irqsave(&session->lock, flags);
1877         while (session->state != ISCSI_SESSION_LOGGED_IN) {
1878                 if (session->state == ISCSI_SESSION_FREE) {
1879                         ret = FAST_IO_FAIL;
1880                         break;
1881                 }
1882                 spin_unlock_irqrestore(&session->lock, flags);
1883                 msleep(1000);
1884                 spin_lock_irqsave(&session->lock, flags);
1885         }
1886         spin_unlock_irqrestore(&session->lock, flags);
1887         return ret;
1888 }
1889 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
1890
1891 static void session_recovery_timedout(struct work_struct *work)
1892 {
1893         struct iscsi_cls_session *session =
1894                 container_of(work, struct iscsi_cls_session,
1895                              recovery_work.work);
1896         unsigned long flags;
1897
1898         iscsi_cls_session_printk(KERN_INFO, session,
1899                                  "session recovery timed out after %d secs\n",
1900                                  session->recovery_tmo);
1901
1902         spin_lock_irqsave(&session->lock, flags);
1903         switch (session->state) {
1904         case ISCSI_SESSION_FAILED:
1905                 session->state = ISCSI_SESSION_FREE;
1906                 break;
1907         case ISCSI_SESSION_LOGGED_IN:
1908         case ISCSI_SESSION_FREE:
1909                 /* we raced with the unblock's flush */
1910                 spin_unlock_irqrestore(&session->lock, flags);
1911                 return;
1912         }
1913         spin_unlock_irqrestore(&session->lock, flags);
1914
1915         if (session->transport->session_recovery_timedout)
1916                 session->transport->session_recovery_timedout(session);
1917
1918         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
1919         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
1920         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
1921 }
1922
1923 static void __iscsi_unblock_session(struct work_struct *work)
1924 {
1925         struct iscsi_cls_session *session =
1926                         container_of(work, struct iscsi_cls_session,
1927                                      unblock_work);
1928         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1929         struct iscsi_cls_host *ihost = shost->shost_data;
1930         unsigned long flags;
1931
1932         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
1933         /*
1934          * The recovery and unblock work get run from the same workqueue,
1935          * so try to cancel it if it was going to run after this unblock.
1936          */
1937         cancel_delayed_work(&session->recovery_work);
1938         spin_lock_irqsave(&session->lock, flags);
1939         session->state = ISCSI_SESSION_LOGGED_IN;
1940         spin_unlock_irqrestore(&session->lock, flags);
1941         /* start IO */
1942         scsi_target_unblock(&session->dev, SDEV_RUNNING);
1943         /*
1944          * Only do kernel scanning if the driver is properly hooked into
1945          * the async scanning code (drivers like iscsi_tcp do login and
1946          * scanning from userspace).
1947          */
1948         if (shost->hostt->scan_finished) {
1949                 if (scsi_queue_work(shost, &session->scan_work))
1950                         atomic_inc(&ihost->nr_scans);
1951         }
1952         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
1953 }
1954
1955 /**
1956  * iscsi_unblock_session - set a session as logged in and start IO.
1957  * @session: iscsi session
1958  *
1959  * Mark a session as ready to accept IO.
1960  */
1961 void iscsi_unblock_session(struct iscsi_cls_session *session)
1962 {
1963         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
1964         /*
1965          * make sure all the events have completed before tell the driver
1966          * it is safe
1967          */
1968         flush_workqueue(iscsi_eh_timer_workq);
1969 }
1970 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
1971
1972 static void __iscsi_block_session(struct work_struct *work)
1973 {
1974         struct iscsi_cls_session *session =
1975                         container_of(work, struct iscsi_cls_session,
1976                                      block_work);
1977         unsigned long flags;
1978
1979         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
1980         spin_lock_irqsave(&session->lock, flags);
1981         session->state = ISCSI_SESSION_FAILED;
1982         spin_unlock_irqrestore(&session->lock, flags);
1983         scsi_target_block(&session->dev);
1984         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
1985         if (session->recovery_tmo >= 0)
1986                 queue_delayed_work(iscsi_eh_timer_workq,
1987                                    &session->recovery_work,
1988                                    session->recovery_tmo * HZ);
1989 }
1990
1991 void iscsi_block_session(struct iscsi_cls_session *session)
1992 {
1993         queue_work(iscsi_eh_timer_workq, &session->block_work);
1994 }
1995 EXPORT_SYMBOL_GPL(iscsi_block_session);
1996
1997 static void __iscsi_unbind_session(struct work_struct *work)
1998 {
1999         struct iscsi_cls_session *session =
2000                         container_of(work, struct iscsi_cls_session,
2001                                      unbind_work);
2002         struct Scsi_Host *shost = iscsi_session_to_shost(session);
2003         struct iscsi_cls_host *ihost = shost->shost_data;
2004         unsigned long flags;
2005         unsigned int target_id;
2006
2007         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
2008
2009         /* Prevent new scans and make sure scanning is not in progress */
2010         mutex_lock(&ihost->mutex);
2011         spin_lock_irqsave(&session->lock, flags);
2012         if (session->target_id == ISCSI_MAX_TARGET) {
2013                 spin_unlock_irqrestore(&session->lock, flags);
2014                 mutex_unlock(&ihost->mutex);
2015                 return;
2016         }
2017
2018         target_id = session->target_id;
2019         session->target_id = ISCSI_MAX_TARGET;
2020         spin_unlock_irqrestore(&session->lock, flags);
2021         mutex_unlock(&ihost->mutex);
2022
2023         if (session->ida_used)
2024                 ida_simple_remove(&iscsi_sess_ida, target_id);
2025
2026         scsi_remove_target(&session->dev);
2027         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
2028         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
2029 }
2030
2031 struct iscsi_cls_session *
2032 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2033                     int dd_size)
2034 {
2035         struct iscsi_cls_session *session;
2036
2037         session = kzalloc(sizeof(*session) + dd_size,
2038                           GFP_KERNEL);
2039         if (!session)
2040                 return NULL;
2041
2042         session->transport = transport;
2043         session->creator = -1;
2044         session->recovery_tmo = 120;
2045         session->recovery_tmo_sysfs_override = false;
2046         session->state = ISCSI_SESSION_FREE;
2047         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
2048         INIT_LIST_HEAD(&session->sess_list);
2049         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
2050         INIT_WORK(&session->block_work, __iscsi_block_session);
2051         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
2052         INIT_WORK(&session->scan_work, iscsi_scan_session);
2053         spin_lock_init(&session->lock);
2054
2055         /* this is released in the dev's release function */
2056         scsi_host_get(shost);
2057         session->dev.parent = &shost->shost_gendev;
2058         session->dev.release = iscsi_session_release;
2059         device_initialize(&session->dev);
2060         if (dd_size)
2061                 session->dd_data = &session[1];
2062
2063         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
2064         return session;
2065 }
2066 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
2067
2068 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
2069 {
2070         unsigned long flags;
2071         int id = 0;
2072         int err;
2073
2074         session->sid = atomic_add_return(1, &iscsi_session_nr);
2075
2076         if (target_id == ISCSI_MAX_TARGET) {
2077                 id = ida_simple_get(&iscsi_sess_ida, 0, 0, GFP_KERNEL);
2078
2079                 if (id < 0) {
2080                         iscsi_cls_session_printk(KERN_ERR, session,
2081                                         "Failure in Target ID Allocation\n");
2082                         return id;
2083                 }
2084                 session->target_id = (unsigned int)id;
2085                 session->ida_used = true;
2086         } else
2087                 session->target_id = target_id;
2088
2089         dev_set_name(&session->dev, "session%u", session->sid);
2090         err = device_add(&session->dev);
2091         if (err) {
2092                 iscsi_cls_session_printk(KERN_ERR, session,
2093                                          "could not register session's dev\n");
2094                 goto release_ida;
2095         }
2096         transport_register_device(&session->dev);
2097
2098         spin_lock_irqsave(&sesslock, flags);
2099         list_add(&session->sess_list, &sesslist);
2100         spin_unlock_irqrestore(&sesslock, flags);
2101
2102         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
2103         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
2104         return 0;
2105
2106 release_ida:
2107         if (session->ida_used)
2108                 ida_simple_remove(&iscsi_sess_ida, session->target_id);
2109
2110         return err;
2111 }
2112 EXPORT_SYMBOL_GPL(iscsi_add_session);
2113
2114 /**
2115  * iscsi_create_session - create iscsi class session
2116  * @shost: scsi host
2117  * @transport: iscsi transport
2118  * @dd_size: private driver data size
2119  * @target_id: which target
2120  *
2121  * This can be called from a LLD or iscsi_transport.
2122  */
2123 struct iscsi_cls_session *
2124 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
2125                      int dd_size, unsigned int target_id)
2126 {
2127         struct iscsi_cls_session *session;
2128
2129         session = iscsi_alloc_session(shost, transport, dd_size);
2130         if (!session)
2131                 return NULL;
2132
2133         if (iscsi_add_session(session, target_id)) {
2134                 iscsi_free_session(session);
2135                 return NULL;
2136         }
2137         return session;
2138 }
2139 EXPORT_SYMBOL_GPL(iscsi_create_session);
2140
2141 static void iscsi_conn_release(struct device *dev)
2142 {
2143         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
2144         struct device *parent = conn->dev.parent;
2145
2146         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
2147         kfree(conn);
2148         put_device(parent);
2149 }
2150
2151 static int iscsi_is_conn_dev(const struct device *dev)
2152 {
2153         return dev->release == iscsi_conn_release;
2154 }
2155
2156 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
2157 {
2158         if (!iscsi_is_conn_dev(dev))
2159                 return 0;
2160         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
2161 }
2162
2163 void iscsi_remove_session(struct iscsi_cls_session *session)
2164 {
2165         unsigned long flags;
2166         int err;
2167
2168         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
2169
2170         spin_lock_irqsave(&sesslock, flags);
2171         list_del(&session->sess_list);
2172         spin_unlock_irqrestore(&sesslock, flags);
2173
2174         /* make sure there are no blocks/unblocks queued */
2175         flush_workqueue(iscsi_eh_timer_workq);
2176         /* make sure the timedout callout is not running */
2177         if (!cancel_delayed_work(&session->recovery_work))
2178                 flush_workqueue(iscsi_eh_timer_workq);
2179         /*
2180          * If we are blocked let commands flow again. The lld or iscsi
2181          * layer should set up the queuecommand to fail commands.
2182          * We assume that LLD will not be calling block/unblock while
2183          * removing the session.
2184          */
2185         spin_lock_irqsave(&session->lock, flags);
2186         session->state = ISCSI_SESSION_FREE;
2187         spin_unlock_irqrestore(&session->lock, flags);
2188
2189         scsi_target_unblock(&session->dev, SDEV_TRANSPORT_OFFLINE);
2190         /* flush running scans then delete devices */
2191         flush_work(&session->scan_work);
2192         /* flush running unbind operations */
2193         flush_work(&session->unbind_work);
2194         __iscsi_unbind_session(&session->unbind_work);
2195
2196         /* hw iscsi may not have removed all connections from session */
2197         err = device_for_each_child(&session->dev, NULL,
2198                                     iscsi_iter_destroy_conn_fn);
2199         if (err)
2200                 iscsi_cls_session_printk(KERN_ERR, session,
2201                                          "Could not delete all connections "
2202                                          "for session. Error %d.\n", err);
2203
2204         transport_unregister_device(&session->dev);
2205
2206         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
2207         device_del(&session->dev);
2208 }
2209 EXPORT_SYMBOL_GPL(iscsi_remove_session);
2210
2211 void iscsi_free_session(struct iscsi_cls_session *session)
2212 {
2213         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
2214         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
2215         put_device(&session->dev);
2216 }
2217 EXPORT_SYMBOL_GPL(iscsi_free_session);
2218
2219 /**
2220  * iscsi_create_conn - create iscsi class connection
2221  * @session: iscsi cls session
2222  * @dd_size: private driver data size
2223  * @cid: connection id
2224  *
2225  * This can be called from a LLD or iscsi_transport. The connection
2226  * is child of the session so cid must be unique for all connections
2227  * on the session.
2228  *
2229  * Since we do not support MCS, cid will normally be zero. In some cases
2230  * for software iscsi we could be trying to preallocate a connection struct
2231  * in which case there could be two connection structs and cid would be
2232  * non-zero.
2233  */
2234 struct iscsi_cls_conn *
2235 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
2236 {
2237         struct iscsi_transport *transport = session->transport;
2238         struct iscsi_cls_conn *conn;
2239         unsigned long flags;
2240         int err;
2241
2242         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
2243         if (!conn)
2244                 return NULL;
2245         if (dd_size)
2246                 conn->dd_data = &conn[1];
2247
2248         mutex_init(&conn->ep_mutex);
2249         INIT_LIST_HEAD(&conn->conn_list);
2250         conn->transport = transport;
2251         conn->cid = cid;
2252
2253         /* this is released in the dev's release function */
2254         if (!get_device(&session->dev))
2255                 goto free_conn;
2256
2257         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
2258         conn->dev.parent = &session->dev;
2259         conn->dev.release = iscsi_conn_release;
2260         err = device_register(&conn->dev);
2261         if (err) {
2262                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
2263                                          "register connection's dev\n");
2264                 goto release_parent_ref;
2265         }
2266         transport_register_device(&conn->dev);
2267
2268         spin_lock_irqsave(&connlock, flags);
2269         list_add(&conn->conn_list, &connlist);
2270         spin_unlock_irqrestore(&connlock, flags);
2271
2272         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
2273         return conn;
2274
2275 release_parent_ref:
2276         put_device(&session->dev);
2277 free_conn:
2278         kfree(conn);
2279         return NULL;
2280 }
2281
2282 EXPORT_SYMBOL_GPL(iscsi_create_conn);
2283
2284 /**
2285  * iscsi_destroy_conn - destroy iscsi class connection
2286  * @conn: iscsi cls session
2287  *
2288  * This can be called from a LLD or iscsi_transport.
2289  */
2290 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
2291 {
2292         unsigned long flags;
2293
2294         spin_lock_irqsave(&connlock, flags);
2295         list_del(&conn->conn_list);
2296         spin_unlock_irqrestore(&connlock, flags);
2297
2298         transport_unregister_device(&conn->dev);
2299         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
2300         device_unregister(&conn->dev);
2301         return 0;
2302 }
2303 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
2304
2305 /*
2306  * iscsi interface functions
2307  */
2308 static struct iscsi_internal *
2309 iscsi_if_transport_lookup(struct iscsi_transport *tt)
2310 {
2311         struct iscsi_internal *priv;
2312         unsigned long flags;
2313
2314         spin_lock_irqsave(&iscsi_transport_lock, flags);
2315         list_for_each_entry(priv, &iscsi_transports, list) {
2316                 if (tt == priv->iscsi_transport) {
2317                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2318                         return priv;
2319                 }
2320         }
2321         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2322         return NULL;
2323 }
2324
2325 static int
2326 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
2327 {
2328         return nlmsg_multicast(nls, skb, 0, group, gfp);
2329 }
2330
2331 static int
2332 iscsi_unicast_skb(struct sk_buff *skb, u32 portid)
2333 {
2334         return nlmsg_unicast(nls, skb, portid);
2335 }
2336
2337 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
2338                    char *data, uint32_t data_size)
2339 {
2340         struct nlmsghdr *nlh;
2341         struct sk_buff *skb;
2342         struct iscsi_uevent *ev;
2343         char *pdu;
2344         struct iscsi_internal *priv;
2345         int len = nlmsg_total_size(sizeof(*ev) + sizeof(struct iscsi_hdr) +
2346                                    data_size);
2347
2348         priv = iscsi_if_transport_lookup(conn->transport);
2349         if (!priv)
2350                 return -EINVAL;
2351
2352         skb = alloc_skb(len, GFP_ATOMIC);
2353         if (!skb) {
2354                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
2355                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
2356                                       "control PDU: OOM\n");
2357                 return -ENOMEM;
2358         }
2359
2360         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2361         ev = nlmsg_data(nlh);
2362         memset(ev, 0, sizeof(*ev));
2363         ev->transport_handle = iscsi_handle(conn->transport);
2364         ev->type = ISCSI_KEVENT_RECV_PDU;
2365         ev->r.recv_req.cid = conn->cid;
2366         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
2367         pdu = (char*)ev + sizeof(*ev);
2368         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
2369         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
2370
2371         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2372 }
2373 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
2374
2375 int iscsi_offload_mesg(struct Scsi_Host *shost,
2376                        struct iscsi_transport *transport, uint32_t type,
2377                        char *data, uint16_t data_size)
2378 {
2379         struct nlmsghdr *nlh;
2380         struct sk_buff *skb;
2381         struct iscsi_uevent *ev;
2382         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2383
2384         skb = alloc_skb(len, GFP_ATOMIC);
2385         if (!skb) {
2386                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
2387                 return -ENOMEM;
2388         }
2389
2390         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2391         ev = nlmsg_data(nlh);
2392         memset(ev, 0, sizeof(*ev));
2393         ev->type = type;
2394         ev->transport_handle = iscsi_handle(transport);
2395         switch (type) {
2396         case ISCSI_KEVENT_PATH_REQ:
2397                 ev->r.req_path.host_no = shost->host_no;
2398                 break;
2399         case ISCSI_KEVENT_IF_DOWN:
2400                 ev->r.notify_if_down.host_no = shost->host_no;
2401                 break;
2402         }
2403
2404         memcpy((char *)ev + sizeof(*ev), data, data_size);
2405
2406         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
2407 }
2408 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
2409
2410 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
2411 {
2412         struct nlmsghdr *nlh;
2413         struct sk_buff  *skb;
2414         struct iscsi_uevent *ev;
2415         struct iscsi_internal *priv;
2416         int len = nlmsg_total_size(sizeof(*ev));
2417
2418         priv = iscsi_if_transport_lookup(conn->transport);
2419         if (!priv)
2420                 return;
2421
2422         skb = alloc_skb(len, GFP_ATOMIC);
2423         if (!skb) {
2424                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2425                                       "conn error (%d)\n", error);
2426                 return;
2427         }
2428
2429         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2430         ev = nlmsg_data(nlh);
2431         ev->transport_handle = iscsi_handle(conn->transport);
2432         ev->type = ISCSI_KEVENT_CONN_ERROR;
2433         ev->r.connerror.error = error;
2434         ev->r.connerror.cid = conn->cid;
2435         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
2436
2437         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2438
2439         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
2440                               error);
2441 }
2442 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
2443
2444 void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
2445                             enum iscsi_conn_state state)
2446 {
2447         struct nlmsghdr *nlh;
2448         struct sk_buff  *skb;
2449         struct iscsi_uevent *ev;
2450         struct iscsi_internal *priv;
2451         int len = nlmsg_total_size(sizeof(*ev));
2452
2453         priv = iscsi_if_transport_lookup(conn->transport);
2454         if (!priv)
2455                 return;
2456
2457         skb = alloc_skb(len, GFP_ATOMIC);
2458         if (!skb) {
2459                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
2460                                       "conn login (%d)\n", state);
2461                 return;
2462         }
2463
2464         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2465         ev = nlmsg_data(nlh);
2466         ev->transport_handle = iscsi_handle(conn->transport);
2467         ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
2468         ev->r.conn_login.state = state;
2469         ev->r.conn_login.cid = conn->cid;
2470         ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
2471         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
2472
2473         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
2474                               state);
2475 }
2476 EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
2477
2478 void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
2479                            enum iscsi_host_event_code code, uint32_t data_size,
2480                            uint8_t *data)
2481 {
2482         struct nlmsghdr *nlh;
2483         struct sk_buff *skb;
2484         struct iscsi_uevent *ev;
2485         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2486
2487         skb = alloc_skb(len, GFP_NOIO);
2488         if (!skb) {
2489                 printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
2490                        host_no, code);
2491                 return;
2492         }
2493
2494         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2495         ev = nlmsg_data(nlh);
2496         ev->transport_handle = iscsi_handle(transport);
2497         ev->type = ISCSI_KEVENT_HOST_EVENT;
2498         ev->r.host_event.host_no = host_no;
2499         ev->r.host_event.code = code;
2500         ev->r.host_event.data_size = data_size;
2501
2502         if (data_size)
2503                 memcpy((char *)ev + sizeof(*ev), data, data_size);
2504
2505         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2506 }
2507 EXPORT_SYMBOL_GPL(iscsi_post_host_event);
2508
2509 void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
2510                            uint32_t status, uint32_t pid, uint32_t data_size,
2511                            uint8_t *data)
2512 {
2513         struct nlmsghdr *nlh;
2514         struct sk_buff *skb;
2515         struct iscsi_uevent *ev;
2516         int len = nlmsg_total_size(sizeof(*ev) + data_size);
2517
2518         skb = alloc_skb(len, GFP_NOIO);
2519         if (!skb) {
2520                 printk(KERN_ERR "gracefully ignored ping comp: OOM\n");
2521                 return;
2522         }
2523
2524         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2525         ev = nlmsg_data(nlh);
2526         ev->transport_handle = iscsi_handle(transport);
2527         ev->type = ISCSI_KEVENT_PING_COMP;
2528         ev->r.ping_comp.host_no = host_no;
2529         ev->r.ping_comp.status = status;
2530         ev->r.ping_comp.pid = pid;
2531         ev->r.ping_comp.data_size = data_size;
2532         memcpy((char *)ev + sizeof(*ev), data, data_size);
2533
2534         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_NOIO);
2535 }
2536 EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
2537
2538 static int
2539 iscsi_if_send_reply(u32 portid, int type, void *payload, int size)
2540 {
2541         struct sk_buff  *skb;
2542         struct nlmsghdr *nlh;
2543         int len = nlmsg_total_size(size);
2544
2545         skb = alloc_skb(len, GFP_ATOMIC);
2546         if (!skb) {
2547                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
2548                 return -ENOMEM;
2549         }
2550
2551         nlh = __nlmsg_put(skb, 0, 0, type, (len - sizeof(*nlh)), 0);
2552         memcpy(nlmsg_data(nlh), payload, size);
2553         return iscsi_unicast_skb(skb, portid);
2554 }
2555
2556 static int
2557 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
2558 {
2559         struct iscsi_uevent *ev = nlmsg_data(nlh);
2560         struct iscsi_stats *stats;
2561         struct sk_buff *skbstat;
2562         struct iscsi_cls_conn *conn;
2563         struct nlmsghdr *nlhstat;
2564         struct iscsi_uevent *evstat;
2565         struct iscsi_internal *priv;
2566         int len = nlmsg_total_size(sizeof(*ev) +
2567                                    sizeof(struct iscsi_stats) +
2568                                    sizeof(struct iscsi_stats_custom) *
2569                                    ISCSI_STATS_CUSTOM_MAX);
2570         int err = 0;
2571
2572         priv = iscsi_if_transport_lookup(transport);
2573         if (!priv)
2574                 return -EINVAL;
2575
2576         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
2577         if (!conn)
2578                 return -EEXIST;
2579
2580         do {
2581                 int actual_size;
2582
2583                 skbstat = alloc_skb(len, GFP_ATOMIC);
2584                 if (!skbstat) {
2585                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
2586                                               "deliver stats: OOM\n");
2587                         return -ENOMEM;
2588                 }
2589
2590                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
2591                                       (len - sizeof(*nlhstat)), 0);
2592                 evstat = nlmsg_data(nlhstat);
2593                 memset(evstat, 0, sizeof(*evstat));
2594                 evstat->transport_handle = iscsi_handle(conn->transport);
2595                 evstat->type = nlh->nlmsg_type;
2596                 evstat->u.get_stats.cid =
2597                         ev->u.get_stats.cid;
2598                 evstat->u.get_stats.sid =
2599                         ev->u.get_stats.sid;
2600                 stats = (struct iscsi_stats *)
2601                         ((char*)evstat + sizeof(*evstat));
2602                 memset(stats, 0, sizeof(*stats));
2603
2604                 transport->get_stats(conn, stats);
2605                 actual_size = nlmsg_total_size(sizeof(struct iscsi_uevent) +
2606                                                sizeof(struct iscsi_stats) +
2607                                                sizeof(struct iscsi_stats_custom) *
2608                                                stats->custom_length);
2609                 actual_size -= sizeof(*nlhstat);
2610                 actual_size = nlmsg_msg_size(actual_size);
2611                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
2612                 nlhstat->nlmsg_len = actual_size;
2613
2614                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
2615                                           GFP_ATOMIC);
2616         } while (err < 0 && err != -ECONNREFUSED);
2617
2618         return err;
2619 }
2620
2621 /**
2622  * iscsi_session_event - send session destr. completion event
2623  * @session: iscsi class session
2624  * @event: type of event
2625  */
2626 int iscsi_session_event(struct iscsi_cls_session *session,
2627                         enum iscsi_uevent_e event)
2628 {
2629         struct iscsi_internal *priv;
2630         struct Scsi_Host *shost;
2631         struct iscsi_uevent *ev;
2632         struct sk_buff  *skb;
2633         struct nlmsghdr *nlh;
2634         int rc, len = nlmsg_total_size(sizeof(*ev));
2635
2636         priv = iscsi_if_transport_lookup(session->transport);
2637         if (!priv)
2638                 return -EINVAL;
2639         shost = iscsi_session_to_shost(session);
2640
2641         skb = alloc_skb(len, GFP_KERNEL);
2642         if (!skb) {
2643                 iscsi_cls_session_printk(KERN_ERR, session,
2644                                          "Cannot notify userspace of session "
2645                                          "event %u\n", event);
2646                 return -ENOMEM;
2647         }
2648
2649         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
2650         ev = nlmsg_data(nlh);
2651         ev->transport_handle = iscsi_handle(session->transport);
2652
2653         ev->type = event;
2654         switch (event) {
2655         case ISCSI_KEVENT_DESTROY_SESSION:
2656                 ev->r.d_session.host_no = shost->host_no;
2657                 ev->r.d_session.sid = session->sid;
2658                 break;
2659         case ISCSI_KEVENT_CREATE_SESSION:
2660                 ev->r.c_session_ret.host_no = shost->host_no;
2661                 ev->r.c_session_ret.sid = session->sid;
2662                 break;
2663         case ISCSI_KEVENT_UNBIND_SESSION:
2664                 ev->r.unbind_session.host_no = shost->host_no;
2665                 ev->r.unbind_session.sid = session->sid;
2666                 break;
2667         default:
2668                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
2669                                          "%u.\n", event);
2670                 kfree_skb(skb);
2671                 return -EINVAL;
2672         }
2673
2674         /*
2675          * this will occur if the daemon is not up, so we just warn
2676          * the user and when the daemon is restarted it will handle it
2677          */
2678         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
2679         if (rc == -ESRCH)
2680                 iscsi_cls_session_printk(KERN_ERR, session,
2681                                          "Cannot notify userspace of session "
2682                                          "event %u. Check iscsi daemon\n",
2683                                          event);
2684
2685         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
2686                                 event, rc);
2687         return rc;
2688 }
2689 EXPORT_SYMBOL_GPL(iscsi_session_event);
2690
2691 static int
2692 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
2693                         struct iscsi_uevent *ev, pid_t pid,
2694                         uint32_t initial_cmdsn, uint16_t cmds_max,
2695                         uint16_t queue_depth)
2696 {
2697         struct iscsi_transport *transport = priv->iscsi_transport;
2698         struct iscsi_cls_session *session;
2699         struct Scsi_Host *shost;
2700
2701         session = transport->create_session(ep, cmds_max, queue_depth,
2702                                             initial_cmdsn);
2703         if (!session)
2704                 return -ENOMEM;
2705
2706         session->creator = pid;
2707         shost = iscsi_session_to_shost(session);
2708         ev->r.c_session_ret.host_no = shost->host_no;
2709         ev->r.c_session_ret.sid = session->sid;
2710         ISCSI_DBG_TRANS_SESSION(session,
2711                                 "Completed creating transport session\n");
2712         return 0;
2713 }
2714
2715 static int
2716 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2717 {
2718         struct iscsi_cls_conn *conn;
2719         struct iscsi_cls_session *session;
2720
2721         session = iscsi_session_lookup(ev->u.c_conn.sid);
2722         if (!session) {
2723                 printk(KERN_ERR "iscsi: invalid session %d.\n",
2724                        ev->u.c_conn.sid);
2725                 return -EINVAL;
2726         }
2727
2728         conn = transport->create_conn(session, ev->u.c_conn.cid);
2729         if (!conn) {
2730                 iscsi_cls_session_printk(KERN_ERR, session,
2731                                          "couldn't create a new connection.");
2732                 return -ENOMEM;
2733         }
2734
2735         ev->r.c_conn_ret.sid = session->sid;
2736         ev->r.c_conn_ret.cid = conn->cid;
2737
2738         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
2739         return 0;
2740 }
2741
2742 static int
2743 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2744 {
2745         struct iscsi_cls_conn *conn;
2746
2747         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
2748         if (!conn)
2749                 return -EINVAL;
2750
2751         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
2752         if (transport->destroy_conn)
2753                 transport->destroy_conn(conn);
2754
2755         return 0;
2756 }
2757
2758 static int
2759 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2760 {
2761         char *data = (char*)ev + sizeof(*ev);
2762         struct iscsi_cls_conn *conn;
2763         struct iscsi_cls_session *session;
2764         int err = 0, value = 0;
2765
2766         session = iscsi_session_lookup(ev->u.set_param.sid);
2767         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
2768         if (!conn || !session)
2769                 return -EINVAL;
2770
2771         switch (ev->u.set_param.param) {
2772         case ISCSI_PARAM_SESS_RECOVERY_TMO:
2773                 sscanf(data, "%d", &value);
2774                 if (!session->recovery_tmo_sysfs_override)
2775                         session->recovery_tmo = value;
2776                 break;
2777         default:
2778                 err = transport->set_param(conn, ev->u.set_param.param,
2779                                            data, ev->u.set_param.len);
2780         }
2781
2782         return err;
2783 }
2784
2785 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
2786                                struct iscsi_uevent *ev, int msg_type)
2787 {
2788         struct iscsi_endpoint *ep;
2789         struct sockaddr *dst_addr;
2790         struct Scsi_Host *shost = NULL;
2791         int non_blocking, err = 0;
2792
2793         if (!transport->ep_connect)
2794                 return -EINVAL;
2795
2796         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
2797                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
2798                 if (!shost) {
2799                         printk(KERN_ERR "ep connect failed. Could not find "
2800                                "host no %u\n",
2801                                ev->u.ep_connect_through_host.host_no);
2802                         return -ENODEV;
2803                 }
2804                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
2805         } else
2806                 non_blocking = ev->u.ep_connect.non_blocking;
2807
2808         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2809         ep = transport->ep_connect(shost, dst_addr, non_blocking);
2810         if (IS_ERR(ep)) {
2811                 err = PTR_ERR(ep);
2812                 goto release_host;
2813         }
2814
2815         ev->r.ep_connect_ret.handle = ep->id;
2816 release_host:
2817         if (shost)
2818                 scsi_host_put(shost);
2819         return err;
2820 }
2821
2822 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
2823                                   u64 ep_handle)
2824 {
2825         struct iscsi_cls_conn *conn;
2826         struct iscsi_endpoint *ep;
2827
2828         if (!transport->ep_disconnect)
2829                 return -EINVAL;
2830
2831         ep = iscsi_lookup_endpoint(ep_handle);
2832         if (!ep)
2833                 return -EINVAL;
2834         conn = ep->conn;
2835         if (conn) {
2836                 mutex_lock(&conn->ep_mutex);
2837                 conn->ep = NULL;
2838                 mutex_unlock(&conn->ep_mutex);
2839         }
2840
2841         transport->ep_disconnect(ep);
2842         return 0;
2843 }
2844
2845 static int
2846 iscsi_if_transport_ep(struct iscsi_transport *transport,
2847                       struct iscsi_uevent *ev, int msg_type)
2848 {
2849         struct iscsi_endpoint *ep;
2850         int rc = 0;
2851
2852         switch (msg_type) {
2853         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
2854         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
2855                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
2856                 break;
2857         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
2858                 if (!transport->ep_poll)
2859                         return -EINVAL;
2860
2861                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
2862                 if (!ep)
2863                         return -EINVAL;
2864
2865                 ev->r.retcode = transport->ep_poll(ep,
2866                                                    ev->u.ep_poll.timeout_ms);
2867                 break;
2868         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
2869                 rc = iscsi_if_ep_disconnect(transport,
2870                                             ev->u.ep_disconnect.ep_handle);
2871                 break;
2872         }
2873         return rc;
2874 }
2875
2876 static int
2877 iscsi_tgt_dscvr(struct iscsi_transport *transport,
2878                 struct iscsi_uevent *ev)
2879 {
2880         struct Scsi_Host *shost;
2881         struct sockaddr *dst_addr;
2882         int err;
2883
2884         if (!transport->tgt_dscvr)
2885                 return -EINVAL;
2886
2887         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
2888         if (!shost) {
2889                 printk(KERN_ERR "target discovery could not find host no %u\n",
2890                        ev->u.tgt_dscvr.host_no);
2891                 return -ENODEV;
2892         }
2893
2894
2895         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2896         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
2897                                    ev->u.tgt_dscvr.enable, dst_addr);
2898         scsi_host_put(shost);
2899         return err;
2900 }
2901
2902 static int
2903 iscsi_set_host_param(struct iscsi_transport *transport,
2904                      struct iscsi_uevent *ev)
2905 {
2906         char *data = (char*)ev + sizeof(*ev);
2907         struct Scsi_Host *shost;
2908         int err;
2909
2910         if (!transport->set_host_param)
2911                 return -ENOSYS;
2912
2913         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
2914         if (!shost) {
2915                 printk(KERN_ERR "set_host_param could not find host no %u\n",
2916                        ev->u.set_host_param.host_no);
2917                 return -ENODEV;
2918         }
2919
2920         err = transport->set_host_param(shost, ev->u.set_host_param.param,
2921                                         data, ev->u.set_host_param.len);
2922         scsi_host_put(shost);
2923         return err;
2924 }
2925
2926 static int
2927 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2928 {
2929         struct Scsi_Host *shost;
2930         struct iscsi_path *params;
2931         int err;
2932
2933         if (!transport->set_path)
2934                 return -ENOSYS;
2935
2936         shost = scsi_host_lookup(ev->u.set_path.host_no);
2937         if (!shost) {
2938                 printk(KERN_ERR "set path could not find host no %u\n",
2939                        ev->u.set_path.host_no);
2940                 return -ENODEV;
2941         }
2942
2943         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
2944         err = transport->set_path(shost, params);
2945
2946         scsi_host_put(shost);
2947         return err;
2948 }
2949
2950 static int
2951 iscsi_set_iface_params(struct iscsi_transport *transport,
2952                        struct iscsi_uevent *ev, uint32_t len)
2953 {
2954         char *data = (char *)ev + sizeof(*ev);
2955         struct Scsi_Host *shost;
2956         int err;
2957
2958         if (!transport->set_iface_param)
2959                 return -ENOSYS;
2960
2961         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
2962         if (!shost) {
2963                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
2964                        ev->u.set_iface_params.host_no);
2965                 return -ENODEV;
2966         }
2967
2968         err = transport->set_iface_param(shost, data, len);
2969         scsi_host_put(shost);
2970         return err;
2971 }
2972
2973 static int
2974 iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
2975 {
2976         struct Scsi_Host *shost;
2977         struct sockaddr *dst_addr;
2978         int err;
2979
2980         if (!transport->send_ping)
2981                 return -ENOSYS;
2982
2983         shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
2984         if (!shost) {
2985                 printk(KERN_ERR "iscsi_ping could not find host no %u\n",
2986                        ev->u.iscsi_ping.host_no);
2987                 return -ENODEV;
2988         }
2989
2990         dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
2991         err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
2992                                    ev->u.iscsi_ping.iface_type,
2993                                    ev->u.iscsi_ping.payload_size,
2994                                    ev->u.iscsi_ping.pid,
2995                                    dst_addr);
2996         scsi_host_put(shost);
2997         return err;
2998 }
2999
3000 static int
3001 iscsi_get_chap(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3002 {
3003         struct iscsi_uevent *ev = nlmsg_data(nlh);
3004         struct Scsi_Host *shost = NULL;
3005         struct iscsi_chap_rec *chap_rec;
3006         struct iscsi_internal *priv;
3007         struct sk_buff *skbchap;
3008         struct nlmsghdr *nlhchap;
3009         struct iscsi_uevent *evchap;
3010         uint32_t chap_buf_size;
3011         int len, err = 0;
3012         char *buf;
3013
3014         if (!transport->get_chap)
3015                 return -EINVAL;
3016
3017         priv = iscsi_if_transport_lookup(transport);
3018         if (!priv)
3019                 return -EINVAL;
3020
3021         chap_buf_size = (ev->u.get_chap.num_entries * sizeof(*chap_rec));
3022         len = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3023
3024         shost = scsi_host_lookup(ev->u.get_chap.host_no);
3025         if (!shost) {
3026                 printk(KERN_ERR "%s: failed. Could not find host no %u\n",
3027                        __func__, ev->u.get_chap.host_no);
3028                 return -ENODEV;
3029         }
3030
3031         do {
3032                 int actual_size;
3033
3034                 skbchap = alloc_skb(len, GFP_KERNEL);
3035                 if (!skbchap) {
3036                         printk(KERN_ERR "can not deliver chap: OOM\n");
3037                         err = -ENOMEM;
3038                         goto exit_get_chap;
3039                 }
3040
3041                 nlhchap = __nlmsg_put(skbchap, 0, 0, 0,
3042                                       (len - sizeof(*nlhchap)), 0);
3043                 evchap = nlmsg_data(nlhchap);
3044                 memset(evchap, 0, sizeof(*evchap));
3045                 evchap->transport_handle = iscsi_handle(transport);
3046                 evchap->type = nlh->nlmsg_type;
3047                 evchap->u.get_chap.host_no = ev->u.get_chap.host_no;
3048                 evchap->u.get_chap.chap_tbl_idx = ev->u.get_chap.chap_tbl_idx;
3049                 evchap->u.get_chap.num_entries = ev->u.get_chap.num_entries;
3050                 buf = (char *)evchap + sizeof(*evchap);
3051                 memset(buf, 0, chap_buf_size);
3052
3053                 err = transport->get_chap(shost, ev->u.get_chap.chap_tbl_idx,
3054                                     &evchap->u.get_chap.num_entries, buf);
3055
3056                 actual_size = nlmsg_total_size(sizeof(*ev) + chap_buf_size);
3057                 skb_trim(skbchap, NLMSG_ALIGN(actual_size));
3058                 nlhchap->nlmsg_len = actual_size;
3059
3060                 err = iscsi_multicast_skb(skbchap, ISCSI_NL_GRP_ISCSID,
3061                                           GFP_KERNEL);
3062         } while (err < 0 && err != -ECONNREFUSED);
3063
3064 exit_get_chap:
3065         scsi_host_put(shost);
3066         return err;
3067 }
3068
3069 static int iscsi_set_chap(struct iscsi_transport *transport,
3070                           struct iscsi_uevent *ev, uint32_t len)
3071 {
3072         char *data = (char *)ev + sizeof(*ev);
3073         struct Scsi_Host *shost;
3074         int err = 0;
3075
3076         if (!transport->set_chap)
3077                 return -ENOSYS;
3078
3079         shost = scsi_host_lookup(ev->u.set_path.host_no);
3080         if (!shost) {
3081                 pr_err("%s could not find host no %u\n",
3082                        __func__, ev->u.set_path.host_no);
3083                 return -ENODEV;
3084         }
3085
3086         err = transport->set_chap(shost, data, len);
3087         scsi_host_put(shost);
3088         return err;
3089 }
3090
3091 static int iscsi_delete_chap(struct iscsi_transport *transport,
3092                              struct iscsi_uevent *ev)
3093 {
3094         struct Scsi_Host *shost;
3095         int err = 0;
3096
3097         if (!transport->delete_chap)
3098                 return -ENOSYS;
3099
3100         shost = scsi_host_lookup(ev->u.delete_chap.host_no);
3101         if (!shost) {
3102                 printk(KERN_ERR "%s could not find host no %u\n",
3103                        __func__, ev->u.delete_chap.host_no);
3104                 return -ENODEV;
3105         }
3106
3107         err = transport->delete_chap(shost, ev->u.delete_chap.chap_tbl_idx);
3108         scsi_host_put(shost);
3109         return err;
3110 }
3111
3112 static const struct {
3113         enum iscsi_discovery_parent_type value;
3114         char                            *name;
3115 } iscsi_discovery_parent_names[] = {
3116         {ISCSI_DISC_PARENT_UNKNOWN,     "Unknown" },
3117         {ISCSI_DISC_PARENT_SENDTGT,     "Sendtarget" },
3118         {ISCSI_DISC_PARENT_ISNS,        "isns" },
3119 };
3120
3121 char *iscsi_get_discovery_parent_name(int parent_type)
3122 {
3123         int i;
3124         char *state = "Unknown!";
3125
3126         for (i = 0; i < ARRAY_SIZE(iscsi_discovery_parent_names); i++) {
3127                 if (iscsi_discovery_parent_names[i].value & parent_type) {
3128                         state = iscsi_discovery_parent_names[i].name;
3129                         break;
3130                 }
3131         }
3132         return state;
3133 }
3134 EXPORT_SYMBOL_GPL(iscsi_get_discovery_parent_name);
3135
3136 static int iscsi_set_flashnode_param(struct iscsi_transport *transport,
3137                                      struct iscsi_uevent *ev, uint32_t len)
3138 {
3139         char *data = (char *)ev + sizeof(*ev);
3140         struct Scsi_Host *shost;
3141         struct iscsi_bus_flash_session *fnode_sess;
3142         struct iscsi_bus_flash_conn *fnode_conn;
3143         struct device *dev;
3144         uint32_t idx;
3145         int err = 0;
3146
3147         if (!transport->set_flashnode_param) {
3148                 err = -ENOSYS;
3149                 goto exit_set_fnode;
3150         }
3151
3152         shost = scsi_host_lookup(ev->u.set_flashnode.host_no);
3153         if (!shost) {
3154                 pr_err("%s could not find host no %u\n",
3155                        __func__, ev->u.set_flashnode.host_no);
3156                 err = -ENODEV;
3157                 goto put_host;
3158         }
3159
3160         idx = ev->u.set_flashnode.flashnode_idx;
3161         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3162         if (!fnode_sess) {
3163                 pr_err("%s could not find flashnode %u for host no %u\n",
3164                        __func__, idx, ev->u.set_flashnode.host_no);
3165                 err = -ENODEV;
3166                 goto put_host;
3167         }
3168
3169         dev = iscsi_find_flashnode_conn(fnode_sess);
3170         if (!dev) {
3171                 err = -ENODEV;
3172                 goto put_sess;
3173         }
3174
3175         fnode_conn = iscsi_dev_to_flash_conn(dev);
3176         err = transport->set_flashnode_param(fnode_sess, fnode_conn, data, len);
3177         put_device(dev);
3178
3179 put_sess:
3180         put_device(&fnode_sess->dev);
3181
3182 put_host:
3183         scsi_host_put(shost);
3184
3185 exit_set_fnode:
3186         return err;
3187 }
3188
3189 static int iscsi_new_flashnode(struct iscsi_transport *transport,
3190                                struct iscsi_uevent *ev, uint32_t len)
3191 {
3192         char *data = (char *)ev + sizeof(*ev);
3193         struct Scsi_Host *shost;
3194         int index;
3195         int err = 0;
3196
3197         if (!transport->new_flashnode) {
3198                 err = -ENOSYS;
3199                 goto exit_new_fnode;
3200         }
3201
3202         shost = scsi_host_lookup(ev->u.new_flashnode.host_no);
3203         if (!shost) {
3204                 pr_err("%s could not find host no %u\n",
3205                        __func__, ev->u.new_flashnode.host_no);
3206                 err = -ENODEV;
3207                 goto put_host;
3208         }
3209
3210         index = transport->new_flashnode(shost, data, len);
3211
3212         if (index >= 0)
3213                 ev->r.new_flashnode_ret.flashnode_idx = index;
3214         else
3215                 err = -EIO;
3216
3217 put_host:
3218         scsi_host_put(shost);
3219
3220 exit_new_fnode:
3221         return err;
3222 }
3223
3224 static int iscsi_del_flashnode(struct iscsi_transport *transport,
3225                                struct iscsi_uevent *ev)
3226 {
3227         struct Scsi_Host *shost;
3228         struct iscsi_bus_flash_session *fnode_sess;
3229         uint32_t idx;
3230         int err = 0;
3231
3232         if (!transport->del_flashnode) {
3233                 err = -ENOSYS;
3234                 goto exit_del_fnode;
3235         }
3236
3237         shost = scsi_host_lookup(ev->u.del_flashnode.host_no);
3238         if (!shost) {
3239                 pr_err("%s could not find host no %u\n",
3240                        __func__, ev->u.del_flashnode.host_no);
3241                 err = -ENODEV;
3242                 goto put_host;
3243         }
3244
3245         idx = ev->u.del_flashnode.flashnode_idx;
3246         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3247         if (!fnode_sess) {
3248                 pr_err("%s could not find flashnode %u for host no %u\n",
3249                        __func__, idx, ev->u.del_flashnode.host_no);
3250                 err = -ENODEV;
3251                 goto put_host;
3252         }
3253
3254         err = transport->del_flashnode(fnode_sess);
3255         put_device(&fnode_sess->dev);
3256
3257 put_host:
3258         scsi_host_put(shost);
3259
3260 exit_del_fnode:
3261         return err;
3262 }
3263
3264 static int iscsi_login_flashnode(struct iscsi_transport *transport,
3265                                  struct iscsi_uevent *ev)
3266 {
3267         struct Scsi_Host *shost;
3268         struct iscsi_bus_flash_session *fnode_sess;
3269         struct iscsi_bus_flash_conn *fnode_conn;
3270         struct device *dev;
3271         uint32_t idx;
3272         int err = 0;
3273
3274         if (!transport->login_flashnode) {
3275                 err = -ENOSYS;
3276                 goto exit_login_fnode;
3277         }
3278
3279         shost = scsi_host_lookup(ev->u.login_flashnode.host_no);
3280         if (!shost) {
3281                 pr_err("%s could not find host no %u\n",
3282                        __func__, ev->u.login_flashnode.host_no);
3283                 err = -ENODEV;
3284                 goto put_host;
3285         }
3286
3287         idx = ev->u.login_flashnode.flashnode_idx;
3288         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3289         if (!fnode_sess) {
3290                 pr_err("%s could not find flashnode %u for host no %u\n",
3291                        __func__, idx, ev->u.login_flashnode.host_no);
3292                 err = -ENODEV;
3293                 goto put_host;
3294         }
3295
3296         dev = iscsi_find_flashnode_conn(fnode_sess);
3297         if (!dev) {
3298                 err = -ENODEV;
3299                 goto put_sess;
3300         }
3301
3302         fnode_conn = iscsi_dev_to_flash_conn(dev);
3303         err = transport->login_flashnode(fnode_sess, fnode_conn);
3304         put_device(dev);
3305
3306 put_sess:
3307         put_device(&fnode_sess->dev);
3308
3309 put_host:
3310         scsi_host_put(shost);
3311
3312 exit_login_fnode:
3313         return err;
3314 }
3315
3316 static int iscsi_logout_flashnode(struct iscsi_transport *transport,
3317                                   struct iscsi_uevent *ev)
3318 {
3319         struct Scsi_Host *shost;
3320         struct iscsi_bus_flash_session *fnode_sess;
3321         struct iscsi_bus_flash_conn *fnode_conn;
3322         struct device *dev;
3323         uint32_t idx;
3324         int err = 0;
3325
3326         if (!transport->logout_flashnode) {
3327                 err = -ENOSYS;
3328                 goto exit_logout_fnode;
3329         }
3330
3331         shost = scsi_host_lookup(ev->u.logout_flashnode.host_no);
3332         if (!shost) {
3333                 pr_err("%s could not find host no %u\n",
3334                        __func__, ev->u.logout_flashnode.host_no);
3335                 err = -ENODEV;
3336                 goto put_host;
3337         }
3338
3339         idx = ev->u.logout_flashnode.flashnode_idx;
3340         fnode_sess = iscsi_get_flashnode_by_index(shost, idx);
3341         if (!fnode_sess) {
3342                 pr_err("%s could not find flashnode %u for host no %u\n",
3343                        __func__, idx, ev->u.logout_flashnode.host_no);
3344                 err = -ENODEV;
3345                 goto put_host;
3346         }
3347
3348         dev = iscsi_find_flashnode_conn(fnode_sess);
3349         if (!dev) {
3350                 err = -ENODEV;
3351                 goto put_sess;
3352         }
3353
3354         fnode_conn = iscsi_dev_to_flash_conn(dev);
3355
3356         err = transport->logout_flashnode(fnode_sess, fnode_conn);
3357         put_device(dev);
3358
3359 put_sess:
3360         put_device(&fnode_sess->dev);
3361
3362 put_host:
3363         scsi_host_put(shost);
3364
3365 exit_logout_fnode:
3366         return err;
3367 }
3368
3369 static int iscsi_logout_flashnode_sid(struct iscsi_transport *transport,
3370                                       struct iscsi_uevent *ev)
3371 {
3372         struct Scsi_Host *shost;
3373         struct iscsi_cls_session *session;
3374         int err = 0;
3375
3376         if (!transport->logout_flashnode_sid) {
3377                 err = -ENOSYS;
3378                 goto exit_logout_sid;
3379         }
3380
3381         shost = scsi_host_lookup(ev->u.logout_flashnode_sid.host_no);
3382         if (!shost) {
3383                 pr_err("%s could not find host no %u\n",
3384                        __func__, ev->u.logout_flashnode.host_no);
3385                 err = -ENODEV;
3386                 goto put_host;
3387         }
3388
3389         session = iscsi_session_lookup(ev->u.logout_flashnode_sid.sid);
3390         if (!session) {
3391                 pr_err("%s could not find session id %u\n",
3392                        __func__, ev->u.logout_flashnode_sid.sid);
3393                 err = -EINVAL;
3394                 goto put_host;
3395         }
3396
3397         err = transport->logout_flashnode_sid(session);
3398
3399 put_host:
3400         scsi_host_put(shost);
3401
3402 exit_logout_sid:
3403         return err;
3404 }
3405
3406 static int
3407 iscsi_get_host_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
3408 {
3409         struct iscsi_uevent *ev = nlmsg_data(nlh);
3410         struct Scsi_Host *shost = NULL;
3411         struct iscsi_internal *priv;
3412         struct sk_buff *skbhost_stats;
3413         struct nlmsghdr *nlhhost_stats;
3414         struct iscsi_uevent *evhost_stats;
3415         int host_stats_size = 0;
3416         int len, err = 0;
3417         char *buf;
3418
3419         if (!transport->get_host_stats)
3420                 return -ENOSYS;
3421
3422         priv = iscsi_if_transport_lookup(transport);
3423         if (!priv)
3424                 return -EINVAL;
3425
3426         host_stats_size = sizeof(struct iscsi_offload_host_stats);
3427         len = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3428
3429         shost = scsi_host_lookup(ev->u.get_host_stats.host_no);
3430         if (!shost) {
3431                 pr_err("%s: failed. Could not find host no %u\n",
3432                        __func__, ev->u.get_host_stats.host_no);
3433                 return -ENODEV;
3434         }
3435
3436         do {
3437                 int actual_size;
3438
3439                 skbhost_stats = alloc_skb(len, GFP_KERNEL);
3440                 if (!skbhost_stats) {
3441                         pr_err("cannot deliver host stats: OOM\n");
3442                         err = -ENOMEM;
3443                         goto exit_host_stats;
3444                 }
3445
3446                 nlhhost_stats = __nlmsg_put(skbhost_stats, 0, 0, 0,
3447                                       (len - sizeof(*nlhhost_stats)), 0);
3448                 evhost_stats = nlmsg_data(nlhhost_stats);
3449                 memset(evhost_stats, 0, sizeof(*evhost_stats));
3450                 evhost_stats->transport_handle = iscsi_handle(transport);
3451                 evhost_stats->type = nlh->nlmsg_type;
3452                 evhost_stats->u.get_host_stats.host_no =
3453                                         ev->u.get_host_stats.host_no;
3454                 buf = (char *)evhost_stats + sizeof(*evhost_stats);
3455                 memset(buf, 0, host_stats_size);
3456
3457                 err = transport->get_host_stats(shost, buf, host_stats_size);
3458                 if (err) {
3459                         kfree_skb(skbhost_stats);
3460                         goto exit_host_stats;
3461                 }
3462
3463                 actual_size = nlmsg_total_size(sizeof(*ev) + host_stats_size);
3464                 skb_trim(skbhost_stats, NLMSG_ALIGN(actual_size));
3465                 nlhhost_stats->nlmsg_len = actual_size;
3466
3467                 err = iscsi_multicast_skb(skbhost_stats, ISCSI_NL_GRP_ISCSID,
3468                                           GFP_KERNEL);
3469         } while (err < 0 && err != -ECONNREFUSED);
3470
3471 exit_host_stats:
3472         scsi_host_put(shost);
3473         return err;
3474 }
3475
3476
3477 static int
3478 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
3479 {
3480         int err = 0;
3481         u32 portid;
3482         struct iscsi_uevent *ev = nlmsg_data(nlh);
3483         struct iscsi_transport *transport = NULL;
3484         struct iscsi_internal *priv;
3485         struct iscsi_cls_session *session;
3486         struct iscsi_cls_conn *conn;
3487         struct iscsi_endpoint *ep = NULL;
3488
3489         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
3490                 *group = ISCSI_NL_GRP_UIP;
3491         else
3492                 *group = ISCSI_NL_GRP_ISCSID;
3493
3494         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
3495         if (!priv)
3496                 return -EINVAL;
3497         transport = priv->iscsi_transport;
3498
3499         if (!try_module_get(transport->owner))
3500                 return -EINVAL;
3501
3502         portid = NETLINK_CB(skb).portid;
3503
3504         switch (nlh->nlmsg_type) {
3505         case ISCSI_UEVENT_CREATE_SESSION:
3506                 err = iscsi_if_create_session(priv, ep, ev,
3507                                               portid,
3508                                               ev->u.c_session.initial_cmdsn,
3509                                               ev->u.c_session.cmds_max,
3510                                               ev->u.c_session.queue_depth);
3511                 break;
3512         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
3513                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
3514                 if (!ep) {
3515                         err = -EINVAL;
3516                         break;
3517                 }
3518
3519                 err = iscsi_if_create_session(priv, ep, ev,
3520                                         portid,
3521                                         ev->u.c_bound_session.initial_cmdsn,
3522                                         ev->u.c_bound_session.cmds_max,
3523                                         ev->u.c_bound_session.queue_depth);
3524                 break;
3525         case ISCSI_UEVENT_DESTROY_SESSION:
3526                 session = iscsi_session_lookup(ev->u.d_session.sid);
3527                 if (session)
3528                         transport->destroy_session(session);
3529                 else
3530                         err = -EINVAL;
3531                 break;
3532         case ISCSI_UEVENT_UNBIND_SESSION:
3533                 session = iscsi_session_lookup(ev->u.d_session.sid);
3534                 if (session)
3535                         scsi_queue_work(iscsi_session_to_shost(session),
3536                                         &session->unbind_work);
3537                 else
3538                         err = -EINVAL;
3539                 break;
3540         case ISCSI_UEVENT_CREATE_CONN:
3541                 err = iscsi_if_create_conn(transport, ev);
3542                 break;
3543         case ISCSI_UEVENT_DESTROY_CONN:
3544                 err = iscsi_if_destroy_conn(transport, ev);
3545                 break;
3546         case ISCSI_UEVENT_BIND_CONN:
3547                 session = iscsi_session_lookup(ev->u.b_conn.sid);
3548                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
3549
3550                 if (conn && conn->ep)
3551                         iscsi_if_ep_disconnect(transport, conn->ep->id);
3552
3553                 if (!session || !conn) {
3554                         err = -EINVAL;
3555                         break;
3556                 }
3557
3558                 ev->r.retcode = transport->bind_conn(session, conn,
3559                                                 ev->u.b_conn.transport_eph,
3560                                                 ev->u.b_conn.is_leading);
3561                 if (ev->r.retcode || !transport->ep_connect)
3562                         break;
3563
3564                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
3565                 if (ep) {
3566                         ep->conn = conn;
3567
3568                         mutex_lock(&conn->ep_mutex);
3569                         conn->ep = ep;
3570                         mutex_unlock(&conn->ep_mutex);
3571                 } else
3572                         iscsi_cls_conn_printk(KERN_ERR, conn,
3573                                               "Could not set ep conn "
3574                                               "binding\n");
3575                 break;
3576         case ISCSI_UEVENT_SET_PARAM:
3577                 err = iscsi_set_param(transport, ev);
3578                 break;
3579         case ISCSI_UEVENT_START_CONN:
3580                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
3581                 if (conn)
3582                         ev->r.retcode = transport->start_conn(conn);
3583                 else
3584                         err = -EINVAL;
3585                 break;
3586         case ISCSI_UEVENT_STOP_CONN:
3587                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
3588                 if (conn)
3589                         transport->stop_conn(conn, ev->u.stop_conn.flag);
3590                 else
3591                         err = -EINVAL;
3592                 break;
3593         case ISCSI_UEVENT_SEND_PDU:
3594                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
3595                 if (conn)
3596                         ev->r.retcode = transport->send_pdu(conn,
3597                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
3598                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
3599                                 ev->u.send_pdu.data_size);
3600                 else
3601                         err = -EINVAL;
3602                 break;
3603         case ISCSI_UEVENT_GET_STATS:
3604                 err = iscsi_if_get_stats(transport, nlh);
3605                 break;
3606         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
3607         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
3608         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
3609         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
3610                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
3611                 break;
3612         case ISCSI_UEVENT_TGT_DSCVR:
3613                 err = iscsi_tgt_dscvr(transport, ev);
3614                 break;
3615         case ISCSI_UEVENT_SET_HOST_PARAM:
3616                 err = iscsi_set_host_param(transport, ev);
3617                 break;
3618         case ISCSI_UEVENT_PATH_UPDATE:
3619                 err = iscsi_set_path(transport, ev);
3620                 break;
3621         case ISCSI_UEVENT_SET_IFACE_PARAMS:
3622                 err = iscsi_set_iface_params(transport, ev,
3623                                              nlmsg_attrlen(nlh, sizeof(*ev)));
3624                 break;
3625         case ISCSI_UEVENT_PING:
3626                 err = iscsi_send_ping(transport, ev);
3627                 break;
3628         case ISCSI_UEVENT_GET_CHAP:
3629                 err = iscsi_get_chap(transport, nlh);
3630                 break;
3631         case ISCSI_UEVENT_DELETE_CHAP:
3632                 err = iscsi_delete_chap(transport, ev);
3633                 break;
3634         case ISCSI_UEVENT_SET_FLASHNODE_PARAMS:
3635                 err = iscsi_set_flashnode_param(transport, ev,
3636                                                 nlmsg_attrlen(nlh,
3637                                                               sizeof(*ev)));
3638                 break;
3639         case ISCSI_UEVENT_NEW_FLASHNODE:
3640                 err = iscsi_new_flashnode(transport, ev,
3641                                           nlmsg_attrlen(nlh, sizeof(*ev)));
3642                 break;
3643         case ISCSI_UEVENT_DEL_FLASHNODE:
3644                 err = iscsi_del_flashnode(transport, ev);
3645                 break;
3646         case ISCSI_UEVENT_LOGIN_FLASHNODE:
3647                 err = iscsi_login_flashnode(transport, ev);
3648                 break;
3649         case ISCSI_UEVENT_LOGOUT_FLASHNODE:
3650                 err = iscsi_logout_flashnode(transport, ev);
3651                 break;
3652         case ISCSI_UEVENT_LOGOUT_FLASHNODE_SID:
3653                 err = iscsi_logout_flashnode_sid(transport, ev);
3654                 break;
3655         case ISCSI_UEVENT_SET_CHAP:
3656                 err = iscsi_set_chap(transport, ev,
3657                                      nlmsg_attrlen(nlh, sizeof(*ev)));
3658                 break;
3659         case ISCSI_UEVENT_GET_HOST_STATS:
3660                 err = iscsi_get_host_stats(transport, nlh);
3661                 break;
3662         default:
3663                 err = -ENOSYS;
3664                 break;
3665         }
3666
3667         module_put(transport->owner);
3668         return err;
3669 }
3670
3671 /*
3672  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
3673  * Malformed skbs with wrong lengths or invalid creds are not processed.
3674  */
3675 static void
3676 iscsi_if_rx(struct sk_buff *skb)
3677 {
3678         u32 portid = NETLINK_CB(skb).portid;
3679
3680         mutex_lock(&rx_queue_mutex);
3681         while (skb->len >= NLMSG_HDRLEN) {
3682                 int err;
3683                 uint32_t rlen;
3684                 struct nlmsghdr *nlh;
3685                 struct iscsi_uevent *ev;
3686                 uint32_t group;
3687                 int retries = ISCSI_SEND_MAX_ALLOWED;
3688
3689                 nlh = nlmsg_hdr(skb);
3690                 if (nlh->nlmsg_len < sizeof(*nlh) + sizeof(*ev) ||
3691                     skb->len < nlh->nlmsg_len) {
3692                         break;
3693                 }
3694
3695                 ev = nlmsg_data(nlh);
3696                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
3697                 if (rlen > skb->len)
3698                         rlen = skb->len;
3699
3700                 err = iscsi_if_recv_msg(skb, nlh, &group);
3701                 if (err) {
3702                         ev->type = ISCSI_KEVENT_IF_ERROR;
3703                         ev->iferror = err;
3704                 }
3705                 do {
3706                         /*
3707                          * special case for GET_STATS:
3708                          * on success - sending reply and stats from
3709                          * inside of if_recv_msg(),
3710                          * on error - fall through.
3711                          */
3712                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
3713                                 break;
3714                         if (ev->type == ISCSI_UEVENT_GET_CHAP && !err)
3715                                 break;
3716                         err = iscsi_if_send_reply(portid, nlh->nlmsg_type,
3717                                                   ev, sizeof(*ev));
3718                         if (err == -EAGAIN && --retries < 0) {
3719                                 printk(KERN_WARNING "Send reply failed, error %d\n", err);
3720                                 break;
3721                         }
3722                 } while (err < 0 && err != -ECONNREFUSED && err != -ESRCH);
3723                 skb_pull(skb, rlen);
3724         }
3725         mutex_unlock(&rx_queue_mutex);
3726 }
3727
3728 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
3729 struct device_attribute dev_attr_##_prefix##_##_name =  \
3730         __ATTR(_name,_mode,_show,_store)
3731
3732 /*
3733  * iSCSI connection attrs
3734  */
3735 #define iscsi_conn_attr_show(param)                                     \
3736 static ssize_t                                                          \
3737 show_conn_param_##param(struct device *dev,                             \
3738                         struct device_attribute *attr, char *buf)       \
3739 {                                                                       \
3740         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3741         struct iscsi_transport *t = conn->transport;                    \
3742         return t->get_conn_param(conn, param, buf);                     \
3743 }
3744
3745 #define iscsi_conn_attr(field, param)                                   \
3746         iscsi_conn_attr_show(param)                                     \
3747 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
3748                         NULL);
3749
3750 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
3751 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
3752 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
3753 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
3754 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
3755 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
3756 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
3757 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
3758 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
3759 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
3760 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
3761 iscsi_conn_attr(local_port, ISCSI_PARAM_LOCAL_PORT);
3762 iscsi_conn_attr(statsn, ISCSI_PARAM_STATSN);
3763 iscsi_conn_attr(keepalive_tmo, ISCSI_PARAM_KEEPALIVE_TMO);
3764 iscsi_conn_attr(max_segment_size, ISCSI_PARAM_MAX_SEGMENT_SIZE);
3765 iscsi_conn_attr(tcp_timestamp_stat, ISCSI_PARAM_TCP_TIMESTAMP_STAT);
3766 iscsi_conn_attr(tcp_wsf_disable, ISCSI_PARAM_TCP_WSF_DISABLE);
3767 iscsi_conn_attr(tcp_nagle_disable, ISCSI_PARAM_TCP_NAGLE_DISABLE);
3768 iscsi_conn_attr(tcp_timer_scale, ISCSI_PARAM_TCP_TIMER_SCALE);
3769 iscsi_conn_attr(tcp_timestamp_enable, ISCSI_PARAM_TCP_TIMESTAMP_EN);
3770 iscsi_conn_attr(fragment_disable, ISCSI_PARAM_IP_FRAGMENT_DISABLE);
3771 iscsi_conn_attr(ipv4_tos, ISCSI_PARAM_IPV4_TOS);
3772 iscsi_conn_attr(ipv6_traffic_class, ISCSI_PARAM_IPV6_TC);
3773 iscsi_conn_attr(ipv6_flow_label, ISCSI_PARAM_IPV6_FLOW_LABEL);
3774 iscsi_conn_attr(is_fw_assigned_ipv6, ISCSI_PARAM_IS_FW_ASSIGNED_IPV6);
3775 iscsi_conn_attr(tcp_xmit_wsf, ISCSI_PARAM_TCP_XMIT_WSF);
3776 iscsi_conn_attr(tcp_recv_wsf, ISCSI_PARAM_TCP_RECV_WSF);
3777 iscsi_conn_attr(local_ipaddr, ISCSI_PARAM_LOCAL_IPADDR);
3778
3779
3780 #define iscsi_conn_ep_attr_show(param)                                  \
3781 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
3782                                           struct device_attribute *attr,\
3783                                           char *buf)                    \
3784 {                                                                       \
3785         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
3786         struct iscsi_transport *t = conn->transport;                    \
3787         struct iscsi_endpoint *ep;                                      \
3788         ssize_t rc;                                                     \
3789                                                                         \
3790         /*                                                              \
3791          * Need to make sure ep_disconnect does not free the LLD's      \
3792          * interconnect resources while we are trying to read them.     \
3793          */                                                             \
3794         mutex_lock(&conn->ep_mutex);                                    \
3795         ep = conn->ep;                                                  \
3796         if (!ep && t->ep_connect) {                                     \
3797                 mutex_unlock(&conn->ep_mutex);                          \
3798                 return -ENOTCONN;                                       \
3799         }                                                               \
3800                                                                         \
3801         if (ep)                                                         \
3802                 rc = t->get_ep_param(ep, param, buf);                   \
3803         else                                                            \
3804                 rc = t->get_conn_param(conn, param, buf);               \
3805         mutex_unlock(&conn->ep_mutex);                                  \
3806         return rc;                                                      \
3807 }
3808
3809 #define iscsi_conn_ep_attr(field, param)                                \
3810         iscsi_conn_ep_attr_show(param)                                  \
3811 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
3812                         show_conn_ep_param_##param, NULL);
3813
3814 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
3815 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
3816
3817 static struct attribute *iscsi_conn_attrs[] = {
3818         &dev_attr_conn_max_recv_dlength.attr,
3819         &dev_attr_conn_max_xmit_dlength.attr,
3820         &dev_attr_conn_header_digest.attr,
3821         &dev_attr_conn_data_digest.attr,
3822         &dev_attr_conn_ifmarker.attr,
3823         &dev_attr_conn_ofmarker.attr,
3824         &dev_attr_conn_address.attr,
3825         &dev_attr_conn_port.attr,
3826         &dev_attr_conn_exp_statsn.attr,
3827         &dev_attr_conn_persistent_address.attr,
3828         &dev_attr_conn_persistent_port.attr,
3829         &dev_attr_conn_ping_tmo.attr,
3830         &dev_attr_conn_recv_tmo.attr,
3831         &dev_attr_conn_local_port.attr,
3832         &dev_attr_conn_statsn.attr,
3833         &dev_attr_conn_keepalive_tmo.attr,
3834         &dev_attr_conn_max_segment_size.attr,
3835         &dev_attr_conn_tcp_timestamp_stat.attr,
3836         &dev_attr_conn_tcp_wsf_disable.attr,
3837         &dev_attr_conn_tcp_nagle_disable.attr,
3838         &dev_attr_conn_tcp_timer_scale.attr,
3839         &dev_attr_conn_tcp_timestamp_enable.attr,
3840         &dev_attr_conn_fragment_disable.attr,
3841         &dev_attr_conn_ipv4_tos.attr,
3842         &dev_attr_conn_ipv6_traffic_class.attr,
3843         &dev_attr_conn_ipv6_flow_label.attr,
3844         &dev_attr_conn_is_fw_assigned_ipv6.attr,
3845         &dev_attr_conn_tcp_xmit_wsf.attr,
3846         &dev_attr_conn_tcp_recv_wsf.attr,
3847         &dev_attr_conn_local_ipaddr.attr,
3848         NULL,
3849 };
3850
3851 static umode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
3852                                          struct attribute *attr, int i)
3853 {
3854         struct device *cdev = container_of(kobj, struct device, kobj);
3855         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
3856         struct iscsi_transport *t = conn->transport;
3857         int param;
3858
3859         if (attr == &dev_attr_conn_max_recv_dlength.attr)
3860                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
3861         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
3862                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
3863         else if (attr == &dev_attr_conn_header_digest.attr)
3864                 param = ISCSI_PARAM_HDRDGST_EN;
3865         else if (attr == &dev_attr_conn_data_digest.attr)
3866                 param = ISCSI_PARAM_DATADGST_EN;
3867         else if (attr == &dev_attr_conn_ifmarker.attr)
3868                 param = ISCSI_PARAM_IFMARKER_EN;
3869         else if (attr == &dev_attr_conn_ofmarker.attr)
3870                 param = ISCSI_PARAM_OFMARKER_EN;
3871         else if (attr == &dev_attr_conn_address.attr)
3872                 param = ISCSI_PARAM_CONN_ADDRESS;
3873         else if (attr == &dev_attr_conn_port.attr)
3874                 param = ISCSI_PARAM_CONN_PORT;
3875         else if (attr == &dev_attr_conn_exp_statsn.attr)
3876                 param = ISCSI_PARAM_EXP_STATSN;
3877         else if (attr == &dev_attr_conn_persistent_address.attr)
3878                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
3879         else if (attr == &dev_attr_conn_persistent_port.attr)
3880                 param = ISCSI_PARAM_PERSISTENT_PORT;
3881         else if (attr == &dev_attr_conn_ping_tmo.attr)
3882                 param = ISCSI_PARAM_PING_TMO;
3883         else if (attr == &dev_attr_conn_recv_tmo.attr)
3884                 param = ISCSI_PARAM_RECV_TMO;
3885         else if (attr == &dev_attr_conn_local_port.attr)
3886                 param = ISCSI_PARAM_LOCAL_PORT;
3887         else if (attr == &dev_attr_conn_statsn.attr)
3888                 param = ISCSI_PARAM_STATSN;
3889         else if (attr == &dev_attr_conn_keepalive_tmo.attr)
3890                 param = ISCSI_PARAM_KEEPALIVE_TMO;
3891         else if (attr == &dev_attr_conn_max_segment_size.attr)
3892                 param = ISCSI_PARAM_MAX_SEGMENT_SIZE;
3893         else if (attr == &dev_attr_conn_tcp_timestamp_stat.attr)
3894                 param = ISCSI_PARAM_TCP_TIMESTAMP_STAT;
3895         else if (attr == &dev_attr_conn_tcp_wsf_disable.attr)
3896                 param = ISCSI_PARAM_TCP_WSF_DISABLE;
3897         else if (attr == &dev_attr_conn_tcp_nagle_disable.attr)
3898                 param = ISCSI_PARAM_TCP_NAGLE_DISABLE;
3899         else if (attr == &dev_attr_conn_tcp_timer_scale.attr)
3900                 param = ISCSI_PARAM_TCP_TIMER_SCALE;
3901         else if (attr == &dev_attr_conn_tcp_timestamp_enable.attr)
3902                 param = ISCSI_PARAM_TCP_TIMESTAMP_EN;
3903         else if (attr == &dev_attr_conn_fragment_disable.attr)
3904                 param = ISCSI_PARAM_IP_FRAGMENT_DISABLE;
3905         else if (attr == &dev_attr_conn_ipv4_tos.attr)
3906                 param = ISCSI_PARAM_IPV4_TOS;
3907         else if (attr == &dev_attr_conn_ipv6_traffic_class.attr)
3908                 param = ISCSI_PARAM_IPV6_TC;
3909         else if (attr == &dev_attr_conn_ipv6_flow_label.attr)
3910                 param = ISCSI_PARAM_IPV6_FLOW_LABEL;
3911         else if (attr == &dev_attr_conn_is_fw_assigned_ipv6.attr)
3912                 param = ISCSI_PARAM_IS_FW_ASSIGNED_IPV6;
3913         else if (attr == &dev_attr_conn_tcp_xmit_wsf.attr)
3914                 param = ISCSI_PARAM_TCP_XMIT_WSF;
3915         else if (attr == &dev_attr_conn_tcp_recv_wsf.attr)
3916                 param = ISCSI_PARAM_TCP_RECV_WSF;
3917         else if (attr == &dev_attr_conn_local_ipaddr.attr)
3918                 param = ISCSI_PARAM_LOCAL_IPADDR;
3919         else {
3920                 WARN_ONCE(1, "Invalid conn attr");
3921                 return 0;
3922         }
3923
3924         return t->attr_is_visible(ISCSI_PARAM, param);
3925 }
3926
3927 static struct attribute_group iscsi_conn_group = {
3928         .attrs = iscsi_conn_attrs,
3929         .is_visible = iscsi_conn_attr_is_visible,
3930 };
3931
3932 /*
3933  * iSCSI session attrs
3934  */
3935 #define iscsi_session_attr_show(param, perm)                            \
3936 static ssize_t                                                          \
3937 show_session_param_##param(struct device *dev,                          \
3938                            struct device_attribute *attr, char *buf)    \
3939 {                                                                       \
3940         struct iscsi_cls_session *session =                             \
3941                 iscsi_dev_to_session(dev->parent);                      \
3942         struct iscsi_transport *t = session->transport;                 \
3943                                                                         \
3944         if (perm && !capable(CAP_SYS_ADMIN))                            \
3945                 return -EACCES;                                         \
3946         return t->get_session_param(session, param, buf);               \
3947 }
3948
3949 #define iscsi_session_attr(field, param, perm)                          \
3950         iscsi_session_attr_show(param, perm)                            \
3951 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
3952                         NULL);
3953 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
3954 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
3955 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
3956 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
3957 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
3958 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
3959 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
3960 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
3961 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
3962 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
3963 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
3964 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
3965 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
3966 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
3967 iscsi_session_attr(chap_out_idx, ISCSI_PARAM_CHAP_OUT_IDX, 1);
3968 iscsi_session_attr(chap_in_idx, ISCSI_PARAM_CHAP_IN_IDX, 1);
3969 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
3970 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
3971 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
3972 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
3973 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
3974 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
3975 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
3976 iscsi_session_attr(boot_root, ISCSI_PARAM_BOOT_ROOT, 0);
3977 iscsi_session_attr(boot_nic, ISCSI_PARAM_BOOT_NIC, 0);
3978 iscsi_session_attr(boot_target, ISCSI_PARAM_BOOT_TARGET, 0);
3979 iscsi_session_attr(auto_snd_tgt_disable, ISCSI_PARAM_AUTO_SND_TGT_DISABLE, 0);
3980 iscsi_session_attr(discovery_session, ISCSI_PARAM_DISCOVERY_SESS, 0);
3981 iscsi_session_attr(portal_type, ISCSI_PARAM_PORTAL_TYPE, 0);
3982 iscsi_session_attr(chap_auth, ISCSI_PARAM_CHAP_AUTH_EN, 0);
3983 iscsi_session_attr(discovery_logout, ISCSI_PARAM_DISCOVERY_LOGOUT_EN, 0);
3984 iscsi_session_attr(bidi_chap, ISCSI_PARAM_BIDI_CHAP_EN, 0);
3985 iscsi_session_attr(discovery_auth_optional,
3986                    ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL, 0);
3987 iscsi_session_attr(def_time2wait, ISCSI_PARAM_DEF_TIME2WAIT, 0);
3988 iscsi_session_attr(def_time2retain, ISCSI_PARAM_DEF_TIME2RETAIN, 0);
3989 iscsi_session_attr(isid, ISCSI_PARAM_ISID, 0);
3990 iscsi_session_attr(tsid, ISCSI_PARAM_TSID, 0);
3991 iscsi_session_attr(def_taskmgmt_tmo, ISCSI_PARAM_DEF_TASKMGMT_TMO, 0);
3992 iscsi_session_attr(discovery_parent_idx, ISCSI_PARAM_DISCOVERY_PARENT_IDX, 0);
3993 iscsi_session_attr(discovery_parent_type, ISCSI_PARAM_DISCOVERY_PARENT_TYPE, 0);
3994
3995 static ssize_t
3996 show_priv_session_state(struct device *dev, struct device_attribute *attr,
3997                         char *buf)
3998 {
3999         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4000         return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
4001 }
4002 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
4003                         NULL);
4004 static ssize_t
4005 show_priv_session_creator(struct device *dev, struct device_attribute *attr,
4006                         char *buf)
4007 {
4008         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4009         return sprintf(buf, "%d\n", session->creator);
4010 }
4011 static ISCSI_CLASS_ATTR(priv_sess, creator, S_IRUGO, show_priv_session_creator,
4012                         NULL);
4013 static ssize_t
4014 show_priv_session_target_id(struct device *dev, struct device_attribute *attr,
4015                             char *buf)
4016 {
4017         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
4018         return sprintf(buf, "%d\n", session->target_id);
4019 }
4020 static ISCSI_CLASS_ATTR(priv_sess, target_id, S_IRUGO,
4021                         show_priv_session_target_id, NULL);
4022
4023 #define iscsi_priv_session_attr_show(field, format)                     \
4024 static ssize_t                                                          \
4025 show_priv_session_##field(struct device *dev,                           \
4026                           struct device_attribute *attr, char *buf)     \
4027 {                                                                       \
4028         struct iscsi_cls_session *session =                             \
4029                         iscsi_dev_to_session(dev->parent);              \
4030         if (session->field == -1)                                       \
4031                 return sprintf(buf, "off\n");                           \
4032         return sprintf(buf, format"\n", session->field);                \
4033 }
4034
4035 #define iscsi_priv_session_attr_store(field)                            \
4036 static ssize_t                                                          \
4037 store_priv_session_##field(struct device *dev,                          \
4038                            struct device_attribute *attr,               \
4039                            const char *buf, size_t count)               \
4040 {                                                                       \
4041         int val;                                                        \
4042         char *cp;                                                       \
4043         struct iscsi_cls_session *session =                             \
4044                 iscsi_dev_to_session(dev->parent);                      \
4045         if ((session->state == ISCSI_SESSION_FREE) ||                   \
4046             (session->state == ISCSI_SESSION_FAILED))                   \
4047                 return -EBUSY;                                          \
4048         if (strncmp(buf, "off", 3) == 0) {                              \
4049                 session->field = -1;                                    \
4050                 session->field##_sysfs_override = true;                 \
4051         } else {                                                        \
4052                 val = simple_strtoul(buf, &cp, 0);                      \
4053                 if (*cp != '\0' && *cp != '\n')                         \
4054                         return -EINVAL;                                 \
4055                 session->field = val;                                   \
4056                 session->field##_sysfs_override = true;                 \
4057         }                                                               \
4058         return count;                                                   \
4059 }
4060
4061 #define iscsi_priv_session_rw_attr(field, format)                       \
4062         iscsi_priv_session_attr_show(field, format)                     \
4063         iscsi_priv_session_attr_store(field)                            \
4064 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
4065                         show_priv_session_##field,                      \
4066                         store_priv_session_##field)
4067
4068 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
4069
4070 static struct attribute *iscsi_session_attrs[] = {
4071         &dev_attr_sess_initial_r2t.attr,
4072         &dev_attr_sess_max_outstanding_r2t.attr,
4073         &dev_attr_sess_immediate_data.attr,
4074         &dev_attr_sess_first_burst_len.attr,
4075         &dev_attr_sess_max_burst_len.attr,
4076         &dev_attr_sess_data_pdu_in_order.attr,
4077         &dev_attr_sess_data_seq_in_order.attr,
4078         &dev_attr_sess_erl.attr,
4079         &dev_attr_sess_targetname.attr,
4080         &dev_attr_sess_tpgt.attr,
4081         &dev_attr_sess_password.attr,
4082         &dev_attr_sess_password_in.attr,
4083         &dev_attr_sess_username.attr,
4084         &dev_attr_sess_username_in.attr,
4085         &dev_attr_sess_fast_abort.attr,
4086         &dev_attr_sess_abort_tmo.attr,
4087         &dev_attr_sess_lu_reset_tmo.attr,
4088         &dev_attr_sess_tgt_reset_tmo.attr,
4089         &dev_attr_sess_ifacename.attr,
4090         &dev_attr_sess_initiatorname.attr,
4091         &dev_attr_sess_targetalias.attr,
4092         &dev_attr_sess_boot_root.attr,
4093         &dev_attr_sess_boot_nic.attr,
4094         &dev_attr_sess_boot_target.attr,
4095         &dev_attr_priv_sess_recovery_tmo.attr,
4096         &dev_attr_priv_sess_state.attr,
4097         &dev_attr_priv_sess_creator.attr,
4098         &dev_attr_sess_chap_out_idx.attr,
4099         &dev_attr_sess_chap_in_idx.attr,
4100         &dev_attr_priv_sess_target_id.attr,
4101         &dev_attr_sess_auto_snd_tgt_disable.attr,
4102         &dev_attr_sess_discovery_session.attr,
4103         &dev_attr_sess_portal_type.attr,
4104         &dev_attr_sess_chap_auth.attr,
4105         &dev_attr_sess_discovery_logout.attr,
4106         &dev_attr_sess_bidi_chap.attr,
4107         &dev_attr_sess_discovery_auth_optional.attr,
4108         &dev_attr_sess_def_time2wait.attr,
4109         &dev_attr_sess_def_time2retain.attr,
4110         &dev_attr_sess_isid.attr,
4111         &dev_attr_sess_tsid.attr,
4112         &dev_attr_sess_def_taskmgmt_tmo.attr,
4113         &dev_attr_sess_discovery_parent_idx.attr,
4114         &dev_attr_sess_discovery_parent_type.attr,
4115         NULL,
4116 };
4117
4118 static umode_t iscsi_session_attr_is_visible(struct kobject *kobj,
4119                                             struct attribute *attr, int i)
4120 {
4121         struct device *cdev = container_of(kobj, struct device, kobj);
4122         struct iscsi_cls_session *session = transport_class_to_session(cdev);
4123         struct iscsi_transport *t = session->transport;
4124         int param;
4125
4126         if (attr == &dev_attr_sess_initial_r2t.attr)
4127                 param = ISCSI_PARAM_INITIAL_R2T_EN;
4128         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
4129                 param = ISCSI_PARAM_MAX_R2T;
4130         else if (attr == &dev_attr_sess_immediate_data.attr)
4131                 param = ISCSI_PARAM_IMM_DATA_EN;
4132         else if (attr == &dev_attr_sess_first_burst_len.attr)
4133                 param = ISCSI_PARAM_FIRST_BURST;
4134         else if (attr == &dev_attr_sess_max_burst_len.attr)
4135                 param = ISCSI_PARAM_MAX_BURST;
4136         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
4137                 param = ISCSI_PARAM_PDU_INORDER_EN;
4138         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
4139                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
4140         else if (attr == &dev_attr_sess_erl.attr)
4141                 param = ISCSI_PARAM_ERL;
4142         else if (attr == &dev_attr_sess_targetname.attr)
4143                 param = ISCSI_PARAM_TARGET_NAME;
4144         else if (attr == &dev_attr_sess_tpgt.attr)
4145                 param = ISCSI_PARAM_TPGT;
4146         else if (attr == &dev_attr_sess_chap_in_idx.attr)
4147                 param = ISCSI_PARAM_CHAP_IN_IDX;
4148         else if (attr == &dev_attr_sess_chap_out_idx.attr)
4149                 param = ISCSI_PARAM_CHAP_OUT_IDX;
4150         else if (attr == &dev_attr_sess_password.attr)
4151                 param = ISCSI_PARAM_USERNAME;
4152         else if (attr == &dev_attr_sess_password_in.attr)
4153                 param = ISCSI_PARAM_USERNAME_IN;
4154         else if (attr == &dev_attr_sess_username.attr)
4155                 param = ISCSI_PARAM_PASSWORD;
4156         else if (attr == &dev_attr_sess_username_in.attr)
4157                 param = ISCSI_PARAM_PASSWORD_IN;
4158         else if (attr == &dev_attr_sess_fast_abort.attr)
4159                 param = ISCSI_PARAM_FAST_ABORT;
4160         else if (attr == &dev_attr_sess_abort_tmo.attr)
4161                 param = ISCSI_PARAM_ABORT_TMO;
4162         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
4163                 param = ISCSI_PARAM_LU_RESET_TMO;
4164         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
4165                 param = ISCSI_PARAM_TGT_RESET_TMO;
4166         else if (attr == &dev_attr_sess_ifacename.attr)
4167                 param = ISCSI_PARAM_IFACE_NAME;
4168         else if (attr == &dev_attr_sess_initiatorname.attr)
4169                 param = ISCSI_PARAM_INITIATOR_NAME;
4170         else if (attr == &dev_attr_sess_targetalias.attr)
4171                 param = ISCSI_PARAM_TARGET_ALIAS;
4172         else if (attr == &dev_attr_sess_boot_root.attr)
4173                 param = ISCSI_PARAM_BOOT_ROOT;
4174         else if (attr == &dev_attr_sess_boot_nic.attr)
4175                 param = ISCSI_PARAM_BOOT_NIC;
4176         else if (attr == &dev_attr_sess_boot_target.attr)
4177                 param = ISCSI_PARAM_BOOT_TARGET;
4178         else if (attr == &dev_attr_sess_auto_snd_tgt_disable.attr)
4179                 param = ISCSI_PARAM_AUTO_SND_TGT_DISABLE;
4180         else if (attr == &dev_attr_sess_discovery_session.attr)
4181                 param = ISCSI_PARAM_DISCOVERY_SESS;
4182         else if (attr == &dev_attr_sess_portal_type.attr)
4183                 param = ISCSI_PARAM_PORTAL_TYPE;
4184         else if (attr == &dev_attr_sess_chap_auth.attr)
4185                 param = ISCSI_PARAM_CHAP_AUTH_EN;
4186         else if (attr == &dev_attr_sess_discovery_logout.attr)
4187                 param = ISCSI_PARAM_DISCOVERY_LOGOUT_EN;
4188         else if (attr == &dev_attr_sess_bidi_chap.attr)
4189                 param = ISCSI_PARAM_BIDI_CHAP_EN;
4190         else if (attr == &dev_attr_sess_discovery_auth_optional.attr)
4191                 param = ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL;
4192         else if (attr == &dev_attr_sess_def_time2wait.attr)
4193                 param = ISCSI_PARAM_DEF_TIME2WAIT;
4194         else if (attr == &dev_attr_sess_def_time2retain.attr)
4195                 param = ISCSI_PARAM_DEF_TIME2RETAIN;
4196         else if (attr == &dev_attr_sess_isid.attr)
4197                 param = ISCSI_PARAM_ISID;
4198         else if (attr == &dev_attr_sess_tsid.attr)
4199                 param = ISCSI_PARAM_TSID;
4200         else if (attr == &dev_attr_sess_def_taskmgmt_tmo.attr)
4201                 param = ISCSI_PARAM_DEF_TASKMGMT_TMO;
4202         else if (attr == &dev_attr_sess_discovery_parent_idx.attr)
4203                 param = ISCSI_PARAM_DISCOVERY_PARENT_IDX;
4204         else if (attr == &dev_attr_sess_discovery_parent_type.attr)
4205                 param = ISCSI_PARAM_DISCOVERY_PARENT_TYPE;
4206         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
4207                 return S_IRUGO | S_IWUSR;
4208         else if (attr == &dev_attr_priv_sess_state.attr)
4209                 return S_IRUGO;
4210         else if (attr == &dev_attr_priv_sess_creator.attr)
4211                 return S_IRUGO;
4212         else if (attr == &dev_attr_priv_sess_target_id.attr)
4213                 return S_IRUGO;
4214         else {
4215                 WARN_ONCE(1, "Invalid session attr");
4216                 return 0;
4217         }
4218
4219         return t->attr_is_visible(ISCSI_PARAM, param);
4220 }
4221
4222 static struct attribute_group iscsi_session_group = {
4223         .attrs = iscsi_session_attrs,
4224         .is_visible = iscsi_session_attr_is_visible,
4225 };
4226
4227 /*
4228  * iSCSI host attrs
4229  */
4230 #define iscsi_host_attr_show(param)                                     \
4231 static ssize_t                                                          \
4232 show_host_param_##param(struct device *dev,                             \
4233                         struct device_attribute *attr, char *buf)       \
4234 {                                                                       \
4235         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
4236         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
4237         return priv->iscsi_transport->get_host_param(shost, param, buf); \
4238 }
4239
4240 #define iscsi_host_attr(field, param)                                   \
4241         iscsi_host_attr_show(param)                                     \
4242 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
4243                         NULL);
4244
4245 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
4246 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
4247 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
4248 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
4249 iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
4250 iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
4251
4252 static struct attribute *iscsi_host_attrs[] = {
4253         &dev_attr_host_netdev.attr,
4254         &dev_attr_host_hwaddress.attr,
4255         &dev_attr_host_ipaddress.attr,
4256         &dev_attr_host_initiatorname.attr,
4257         &dev_attr_host_port_state.attr,
4258         &dev_attr_host_port_speed.attr,
4259         NULL,
4260 };
4261
4262 static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
4263                                          struct attribute *attr, int i)
4264 {
4265         struct device *cdev = container_of(kobj, struct device, kobj);
4266         struct Scsi_Host *shost = transport_class_to_shost(cdev);
4267         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
4268         int param;
4269
4270         if (attr == &dev_attr_host_netdev.attr)
4271                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
4272         else if (attr == &dev_attr_host_hwaddress.attr)
4273                 param = ISCSI_HOST_PARAM_HWADDRESS;
4274         else if (attr == &dev_attr_host_ipaddress.attr)
4275                 param = ISCSI_HOST_PARAM_IPADDRESS;
4276         else if (attr == &dev_attr_host_initiatorname.attr)
4277                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
4278         else if (attr == &dev_attr_host_port_state.attr)
4279                 param = ISCSI_HOST_PARAM_PORT_STATE;
4280         else if (attr == &dev_attr_host_port_speed.attr)
4281                 param = ISCSI_HOST_PARAM_PORT_SPEED;
4282         else {
4283                 WARN_ONCE(1, "Invalid host attr");
4284                 return 0;
4285         }
4286
4287         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
4288 }
4289
4290 static struct attribute_group iscsi_host_group = {
4291         .attrs = iscsi_host_attrs,
4292         .is_visible = iscsi_host_attr_is_visible,
4293 };
4294
4295 /* convert iscsi_port_speed values to ascii string name */
4296 static const struct {
4297         enum iscsi_port_speed   value;
4298         char                    *name;
4299 } iscsi_port_speed_names[] = {
4300         {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
4301         {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
4302         {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
4303         {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
4304         {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
4305         {ISCSI_PORT_SPEED_25GBPS,       "25 Gbps" },
4306         {ISCSI_PORT_SPEED_40GBPS,       "40 Gbps" },
4307 };
4308
4309 char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
4310 {
4311         int i;
4312         char *speed = "Unknown!";
4313         struct iscsi_cls_host *ihost = shost->shost_data;
4314         uint32_t port_speed = ihost->port_speed;
4315
4316         for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
4317                 if (iscsi_port_speed_names[i].value & port_speed) {
4318                         speed = iscsi_port_speed_names[i].name;
4319                         break;
4320                 }
4321         }
4322         return speed;
4323 }
4324 EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
4325
4326 /* convert iscsi_port_state values to ascii string name */
4327 static const struct {
4328         enum iscsi_port_state   value;
4329         char                    *name;
4330 } iscsi_port_state_names[] = {
4331         {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
4332         {ISCSI_PORT_STATE_UP,           "LINK UP" },
4333 };
4334
4335 char *iscsi_get_port_state_name(struct Scsi_Host *shost)
4336 {
4337         int i;
4338         char *state = "Unknown!";
4339         struct iscsi_cls_host *ihost = shost->shost_data;
4340         uint32_t port_state = ihost->port_state;
4341
4342         for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
4343                 if (iscsi_port_state_names[i].value & port_state) {
4344                         state = iscsi_port_state_names[i].name;
4345                         break;
4346                 }
4347         }
4348         return state;
4349 }
4350 EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
4351
4352 static int iscsi_session_match(struct attribute_container *cont,
4353                            struct device *dev)
4354 {
4355         struct iscsi_cls_session *session;
4356         struct Scsi_Host *shost;
4357         struct iscsi_internal *priv;
4358
4359         if (!iscsi_is_session_dev(dev))
4360                 return 0;
4361
4362         session = iscsi_dev_to_session(dev);
4363         shost = iscsi_session_to_shost(session);
4364         if (!shost->transportt)
4365                 return 0;
4366
4367         priv = to_iscsi_internal(shost->transportt);
4368         if (priv->session_cont.ac.class != &iscsi_session_class.class)
4369                 return 0;
4370
4371         return &priv->session_cont.ac == cont;
4372 }
4373
4374 static int iscsi_conn_match(struct attribute_container *cont,
4375                            struct device *dev)
4376 {
4377         struct iscsi_cls_session *session;
4378         struct iscsi_cls_conn *conn;
4379         struct Scsi_Host *shost;
4380         struct iscsi_internal *priv;
4381
4382         if (!iscsi_is_conn_dev(dev))
4383                 return 0;
4384
4385         conn = iscsi_dev_to_conn(dev);
4386         session = iscsi_dev_to_session(conn->dev.parent);
4387         shost = iscsi_session_to_shost(session);
4388
4389         if (!shost->transportt)
4390                 return 0;
4391
4392         priv = to_iscsi_internal(shost->transportt);
4393         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
4394                 return 0;
4395
4396         return &priv->conn_cont.ac == cont;
4397 }
4398
4399 static int iscsi_host_match(struct attribute_container *cont,
4400                             struct device *dev)
4401 {
4402         struct Scsi_Host *shost;
4403         struct iscsi_internal *priv;
4404
4405         if (!scsi_is_host_device(dev))
4406                 return 0;
4407
4408         shost = dev_to_shost(dev);
4409         if (!shost->transportt  ||
4410             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
4411                 return 0;
4412
4413         priv = to_iscsi_internal(shost->transportt);
4414         return &priv->t.host_attrs.ac == cont;
4415 }
4416
4417 struct scsi_transport_template *
4418 iscsi_register_transport(struct iscsi_transport *tt)
4419 {
4420         struct iscsi_internal *priv;
4421         unsigned long flags;
4422         int err;
4423
4424         BUG_ON(!tt);
4425
4426         priv = iscsi_if_transport_lookup(tt);
4427         if (priv)
4428                 return NULL;
4429
4430         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
4431         if (!priv)
4432                 return NULL;
4433         INIT_LIST_HEAD(&priv->list);
4434         priv->iscsi_transport = tt;
4435         priv->t.user_scan = iscsi_user_scan;
4436         priv->t.create_work_queue = 1;
4437
4438         priv->dev.class = &iscsi_transport_class;
4439         dev_set_name(&priv->dev, "%s", tt->name);
4440         err = device_register(&priv->dev);
4441         if (err)
4442                 goto free_priv;
4443
4444         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
4445         if (err)
4446                 goto unregister_dev;
4447
4448         /* host parameters */
4449         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
4450         priv->t.host_attrs.ac.match = iscsi_host_match;
4451         priv->t.host_attrs.ac.grp = &iscsi_host_group;
4452         priv->t.host_size = sizeof(struct iscsi_cls_host);
4453         transport_container_register(&priv->t.host_attrs);
4454
4455         /* connection parameters */
4456         priv->conn_cont.ac.class = &iscsi_connection_class.class;
4457         priv->conn_cont.ac.match = iscsi_conn_match;
4458         priv->conn_cont.ac.grp = &iscsi_conn_group;
4459         transport_container_register(&priv->conn_cont);
4460
4461         /* session parameters */
4462         priv->session_cont.ac.class = &iscsi_session_class.class;
4463         priv->session_cont.ac.match = iscsi_session_match;
4464         priv->session_cont.ac.grp = &iscsi_session_group;
4465         transport_container_register(&priv->session_cont);
4466
4467         spin_lock_irqsave(&iscsi_transport_lock, flags);
4468         list_add(&priv->list, &iscsi_transports);
4469         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4470
4471         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
4472         return &priv->t;
4473
4474 unregister_dev:
4475         device_unregister(&priv->dev);
4476         return NULL;
4477 free_priv:
4478         kfree(priv);
4479         return NULL;
4480 }
4481 EXPORT_SYMBOL_GPL(iscsi_register_transport);
4482
4483 int iscsi_unregister_transport(struct iscsi_transport *tt)
4484 {
4485         struct iscsi_internal *priv;
4486         unsigned long flags;
4487
4488         BUG_ON(!tt);
4489
4490         mutex_lock(&rx_queue_mutex);
4491
4492         priv = iscsi_if_transport_lookup(tt);
4493         BUG_ON (!priv);
4494
4495         spin_lock_irqsave(&iscsi_transport_lock, flags);
4496         list_del(&priv->list);
4497         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
4498
4499         transport_container_unregister(&priv->conn_cont);
4500         transport_container_unregister(&priv->session_cont);
4501         transport_container_unregister(&priv->t.host_attrs);
4502
4503         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
4504         device_unregister(&priv->dev);
4505         mutex_unlock(&rx_queue_mutex);
4506
4507         return 0;
4508 }
4509 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
4510
4511 void iscsi_dbg_trace(void (*trace)(struct device *dev, struct va_format *),
4512                      struct device *dev, const char *fmt, ...)
4513 {
4514         struct va_format vaf;
4515         va_list args;
4516
4517         va_start(args, fmt);
4518         vaf.fmt = fmt;
4519         vaf.va = &args;
4520         trace(dev, &vaf);
4521         va_end(args);
4522 }
4523 EXPORT_SYMBOL_GPL(iscsi_dbg_trace);
4524
4525 static __init int iscsi_transport_init(void)
4526 {
4527         int err;
4528         struct netlink_kernel_cfg cfg = {
4529                 .groups = 1,
4530                 .input  = iscsi_if_rx,
4531         };
4532         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
4533                 ISCSI_TRANSPORT_VERSION);
4534
4535         atomic_set(&iscsi_session_nr, 0);
4536
4537         err = class_register(&iscsi_transport_class);
4538         if (err)
4539                 return err;
4540
4541         err = class_register(&iscsi_endpoint_class);
4542         if (err)
4543                 goto unregister_transport_class;
4544
4545         err = class_register(&iscsi_iface_class);
4546         if (err)
4547                 goto unregister_endpoint_class;
4548
4549         err = transport_class_register(&iscsi_host_class);
4550         if (err)
4551                 goto unregister_iface_class;
4552
4553         err = transport_class_register(&iscsi_connection_class);
4554         if (err)
4555                 goto unregister_host_class;
4556
4557         err = transport_class_register(&iscsi_session_class);
4558         if (err)
4559                 goto unregister_conn_class;
4560
4561         err = bus_register(&iscsi_flashnode_bus);
4562         if (err)
4563                 goto unregister_session_class;
4564
4565         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, &cfg);
4566         if (!nls) {
4567                 err = -ENOBUFS;
4568                 goto unregister_flashnode_bus;
4569         }
4570
4571         iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
4572         if (!iscsi_eh_timer_workq) {
4573                 err = -ENOMEM;
4574                 goto release_nls;
4575         }
4576
4577         return 0;
4578
4579 release_nls:
4580         netlink_kernel_release(nls);
4581 unregister_flashnode_bus:
4582         bus_unregister(&iscsi_flashnode_bus);
4583 unregister_session_class:
4584         transport_class_unregister(&iscsi_session_class);
4585 unregister_conn_class:
4586         transport_class_unregister(&iscsi_connection_class);
4587 unregister_host_class:
4588         transport_class_unregister(&iscsi_host_class);
4589 unregister_iface_class:
4590         class_unregister(&iscsi_iface_class);
4591 unregister_endpoint_class:
4592         class_unregister(&iscsi_endpoint_class);
4593 unregister_transport_class:
4594         class_unregister(&iscsi_transport_class);
4595         return err;
4596 }
4597
4598 static void __exit iscsi_transport_exit(void)
4599 {
4600         destroy_workqueue(iscsi_eh_timer_workq);
4601         netlink_kernel_release(nls);
4602         bus_unregister(&iscsi_flashnode_bus);
4603         transport_class_unregister(&iscsi_connection_class);
4604         transport_class_unregister(&iscsi_session_class);
4605         transport_class_unregister(&iscsi_host_class);
4606         class_unregister(&iscsi_endpoint_class);
4607         class_unregister(&iscsi_iface_class);
4608         class_unregister(&iscsi_transport_class);
4609 }
4610
4611 module_init(iscsi_transport_init);
4612 module_exit(iscsi_transport_exit);
4613
4614 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
4615               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
4616               "Alex Aizman <itn780@yahoo.com>");
4617 MODULE_DESCRIPTION("iSCSI Transport Interface");
4618 MODULE_LICENSE("GPL");
4619 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
4620 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);