drivers/scsi/cxgbi/libcxgbi.c

   1 /*
   2  * libcxgbi.c: Chelsio common library for T3/T4 iSCSI driver.
   3  *
   4  * Copyright (c) 2010-2015 Chelsio Communications, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation.
   9  *
  10  * Written by: Karen Xie (kxie@chelsio.com)
  11  * Written by: Rakesh Ranjan (rranjan@chelsio.com)
  12  */
  13
  14 #define pr_fmt(fmt)     KBUILD_MODNAME ":%s: " fmt, __func__
  15
  16 #include <linux/skbuff.h>
  17 #include <linux/crypto.h>
  18 #include <linux/scatterlist.h>
  19 #include <linux/pci.h>
  20 #include <scsi/scsi.h>
  21 #include <scsi/scsi_cmnd.h>
  22 #include <scsi/scsi_host.h>
  23 #include <linux/if_vlan.h>
  24 #include <linux/inet.h>
  25 #include <net/dst.h>
  26 #include <net/route.h>
  27 #include <net/ipv6.h>
  28 #include <net/ip6_route.h>
  29 #include <net/addrconf.h>
  30
  31 #include <linux/inetdevice.h>   /* ip_dev_find */
  32 #include <linux/module.h>
  33 #include <net/tcp.h>
  34
  35 static unsigned int dbg_level;
  36
  37 #include "libcxgbi.h"
  38
  39 #define DRV_MODULE_NAME         "libcxgbi"
  40 #define DRV_MODULE_DESC         "Chelsio iSCSI driver library"
  41 #define DRV_MODULE_VERSION      "0.9.1-ko"
  42 #define DRV_MODULE_RELDATE      "Apr. 2015"
  43
  44 static char version[] =
  45         DRV_MODULE_DESC " " DRV_MODULE_NAME
  46         " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
  47
  48 MODULE_AUTHOR("Chelsio Communications, Inc.");
  49 MODULE_DESCRIPTION(DRV_MODULE_DESC);
  50 MODULE_VERSION(DRV_MODULE_VERSION);
  51 MODULE_LICENSE("GPL");
  52
  53 module_param(dbg_level, uint, 0644);
  54 MODULE_PARM_DESC(dbg_level, "libiscsi debug level (default=0)");
  55
  56
  57 /*
  58  * cxgbi device management
  59  * maintains a list of the cxgbi devices
  60  */
  61 static LIST_HEAD(cdev_list);
  62 static DEFINE_MUTEX(cdev_mutex);
  63
  64 static LIST_HEAD(cdev_rcu_list);
  65 static DEFINE_SPINLOCK(cdev_rcu_lock);
  66
  67 static inline void cxgbi_decode_sw_tag(u32 sw_tag, int *idx, int *age)
  68 {
  69         if (age)
  70                 *age = sw_tag & 0x7FFF;
  71         if (idx)
  72                 *idx = (sw_tag >> 16) & 0x7FFF;
  73 }
  74
  75 int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
  76                                 unsigned int max_conn)
  77 {
  78         struct cxgbi_ports_map *pmap = &cdev->pmap;
  79
  80         pmap->port_csk = cxgbi_alloc_big_mem(max_conn *
  81                                              sizeof(struct cxgbi_sock *),
  82                                              GFP_KERNEL);
  83         if (!pmap->port_csk) {
  84                 pr_warn("cdev 0x%p, portmap OOM %u.\n", cdev, max_conn);
  85                 return -ENOMEM;
  86         }
  87
  88         pmap->max_connect = max_conn;
  89         pmap->sport_base = base;
  90         spin_lock_init(&pmap->lock);
  91         return 0;
  92 }
  93 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_create);
  94
  95 void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev)
  96 {
  97         struct cxgbi_ports_map *pmap = &cdev->pmap;
  98         struct cxgbi_sock *csk;
  99         int i;
 100
 101         for (i = 0; i < pmap->max_connect; i++) {
 102                 if (pmap->port_csk[i]) {
 103                         csk = pmap->port_csk[i];
 104                         pmap->port_csk[i] = NULL;
 105                         log_debug(1 << CXGBI_DBG_SOCK,
 106                                 "csk 0x%p, cdev 0x%p, offload down.\n",
 107                                 csk, cdev);
 108                         spin_lock_bh(&csk->lock);
 109                         cxgbi_sock_set_flag(csk, CTPF_OFFLOAD_DOWN);
 110                         cxgbi_sock_closed(csk);
 111                         spin_unlock_bh(&csk->lock);
 112                         cxgbi_sock_put(csk);
 113                 }
 114         }
 115 }
 116 EXPORT_SYMBOL_GPL(cxgbi_device_portmap_cleanup);
 117
 118 static inline void cxgbi_device_destroy(struct cxgbi_device *cdev)
 119 {
 120         log_debug(1 << CXGBI_DBG_DEV,
 121                 "cdev 0x%p, p# %u.\n", cdev, cdev->nports);
 122         cxgbi_hbas_remove(cdev);
 123         cxgbi_device_portmap_cleanup(cdev);
 124         if (cdev->cdev2ppm)
 125                 cxgbi_ppm_release(cdev->cdev2ppm(cdev));
 126         if (cdev->pmap.max_connect)
 127                 cxgbi_free_big_mem(cdev->pmap.port_csk);
 128         kfree(cdev);
 129 }
 130
 131 struct cxgbi_device *cxgbi_device_register(unsigned int extra,
 132                                            unsigned int nports)
 133 {
 134         struct cxgbi_device *cdev;
 135
 136         cdev = kzalloc(sizeof(*cdev) + extra + nports *
 137                         (sizeof(struct cxgbi_hba *) +
 138                          sizeof(struct net_device *)),
 139                         GFP_KERNEL);
 140         if (!cdev) {
 141                 pr_warn("nport %d, OOM.\n", nports);
 142                 return NULL;
 143         }
 144         cdev->ports = (struct net_device **)(cdev + 1);
 145         cdev->hbas = (struct cxgbi_hba **)(((char*)cdev->ports) + nports *
 146                                                 sizeof(struct net_device *));
 147         if (extra)
 148                 cdev->dd_data = ((char *)cdev->hbas) +
 149                                 nports * sizeof(struct cxgbi_hba *);
 150         spin_lock_init(&cdev->pmap.lock);
 151
 152         mutex_lock(&cdev_mutex);
 153         list_add_tail(&cdev->list_head, &cdev_list);
 154         mutex_unlock(&cdev_mutex);
 155
 156         spin_lock(&cdev_rcu_lock);
 157         list_add_tail_rcu(&cdev->rcu_node, &cdev_rcu_list);
 158         spin_unlock(&cdev_rcu_lock);
 159
 160         log_debug(1 << CXGBI_DBG_DEV,
 161                 "cdev 0x%p, p# %u.\n", cdev, nports);
 162         return cdev;
 163 }
 164 EXPORT_SYMBOL_GPL(cxgbi_device_register);
 165
 166 void cxgbi_device_unregister(struct cxgbi_device *cdev)
 167 {
 168         log_debug(1 << CXGBI_DBG_DEV,
 169                 "cdev 0x%p, p# %u,%s.\n",
 170                 cdev, cdev->nports, cdev->nports ? cdev->ports[0]->name : "");
 171
 172         mutex_lock(&cdev_mutex);
 173         list_del(&cdev->list_head);
 174         mutex_unlock(&cdev_mutex);
 175
 176         spin_lock(&cdev_rcu_lock);
 177         list_del_rcu(&cdev->rcu_node);
 178         spin_unlock(&cdev_rcu_lock);
 179         synchronize_rcu();
 180
 181         cxgbi_device_destroy(cdev);
 182 }
 183 EXPORT_SYMBOL_GPL(cxgbi_device_unregister);
 184
 185 void cxgbi_device_unregister_all(unsigned int flag)
 186 {
 187         struct cxgbi_device *cdev, *tmp;
 188
 189         mutex_lock(&cdev_mutex);
 190         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 191                 if ((cdev->flags & flag) == flag) {
 192                         mutex_unlock(&cdev_mutex);
 193                         cxgbi_device_unregister(cdev);
 194                         mutex_lock(&cdev_mutex);
 195                 }
 196         }
 197         mutex_unlock(&cdev_mutex);
 198 }
 199 EXPORT_SYMBOL_GPL(cxgbi_device_unregister_all);
 200
 201 struct cxgbi_device *cxgbi_device_find_by_lldev(void *lldev)
 202 {
 203         struct cxgbi_device *cdev, *tmp;
 204
 205         mutex_lock(&cdev_mutex);
 206         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 207                 if (cdev->lldev == lldev) {
 208                         mutex_unlock(&cdev_mutex);
 209                         return cdev;
 210                 }
 211         }
 212         mutex_unlock(&cdev_mutex);
 213
 214         log_debug(1 << CXGBI_DBG_DEV,
 215                 "lldev 0x%p, NO match found.\n", lldev);
 216         return NULL;
 217 }
 218 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_lldev);
 219
 220 struct cxgbi_device *cxgbi_device_find_by_netdev(struct net_device *ndev,
 221                                                  int *port)
 222 {
 223         struct net_device *vdev = NULL;
 224         struct cxgbi_device *cdev, *tmp;
 225         int i;
 226
 227         if (is_vlan_dev(ndev)) {
 228                 vdev = ndev;
 229                 ndev = vlan_dev_real_dev(ndev);
 230                 log_debug(1 << CXGBI_DBG_DEV,
 231                         "vlan dev %s -> %s.\n", vdev->name, ndev->name);
 232         }
 233
 234         mutex_lock(&cdev_mutex);
 235         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 236                 for (i = 0; i < cdev->nports; i++) {
 237                         if (ndev == cdev->ports[i]) {
 238                                 cdev->hbas[i]->vdev = vdev;
 239                                 mutex_unlock(&cdev_mutex);
 240                                 if (port)
 241                                         *port = i;
 242                                 return cdev;
 243                         }
 244                 }
 245         }
 246         mutex_unlock(&cdev_mutex);
 247         log_debug(1 << CXGBI_DBG_DEV,
 248                 "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 249         return NULL;
 250 }
 251 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev);
 252
 253 struct cxgbi_device *cxgbi_device_find_by_netdev_rcu(struct net_device *ndev,
 254                                                      int *port)
 255 {
 256         struct net_device *vdev = NULL;
 257         struct cxgbi_device *cdev;
 258         int i;
 259
 260         if (is_vlan_dev(ndev)) {
 261                 vdev = ndev;
 262                 ndev = vlan_dev_real_dev(ndev);
 263                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 264         }
 265
 266         rcu_read_lock();
 267         list_for_each_entry_rcu(cdev, &cdev_rcu_list, rcu_node) {
 268                 for (i = 0; i < cdev->nports; i++) {
 269                         if (ndev == cdev->ports[i]) {
 270                                 cdev->hbas[i]->vdev = vdev;
 271                                 rcu_read_unlock();
 272                                 if (port)
 273                                         *port = i;
 274                                 return cdev;
 275                         }
 276                 }
 277         }
 278         rcu_read_unlock();
 279
 280         log_debug(1 << CXGBI_DBG_DEV,
 281                   "ndev 0x%p, %s, NO match found.\n", ndev, ndev->name);
 282         return NULL;
 283 }
 284 EXPORT_SYMBOL_GPL(cxgbi_device_find_by_netdev_rcu);
 285
 286 static struct cxgbi_device *cxgbi_device_find_by_mac(struct net_device *ndev,
 287                                                      int *port)
 288 {
 289         struct net_device *vdev = NULL;
 290         struct cxgbi_device *cdev, *tmp;
 291         int i;
 292
 293         if (is_vlan_dev(ndev)) {
 294                 vdev = ndev;
 295                 ndev = vlan_dev_real_dev(ndev);
 296                 pr_info("vlan dev %s -> %s.\n", vdev->name, ndev->name);
 297         }
 298
 299         mutex_lock(&cdev_mutex);
 300         list_for_each_entry_safe(cdev, tmp, &cdev_list, list_head) {
 301                 for (i = 0; i < cdev->nports; i++) {
 302                         if (!memcmp(ndev->dev_addr, cdev->ports[i]->dev_addr,
 303                                     MAX_ADDR_LEN)) {
 304                                 cdev->hbas[i]->vdev = vdev;
 305                                 mutex_unlock(&cdev_mutex);
 306                                 if (port)
 307                                         *port = i;
 308                                 return cdev;
 309                         }
 310                 }
 311         }
 312         mutex_unlock(&cdev_mutex);
 313         log_debug(1 << CXGBI_DBG_DEV,
 314                   "ndev 0x%p, %s, NO match mac found.\n",
 315                   ndev, ndev->name);
 316         return NULL;
 317 }
 318
 319 void cxgbi_hbas_remove(struct cxgbi_device *cdev)
 320 {
 321         int i;
 322         struct cxgbi_hba *chba;
 323
 324         log_debug(1 << CXGBI_DBG_DEV,
 325                 "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 326
 327         for (i = 0; i < cdev->nports; i++) {
 328                 chba = cdev->hbas[i];
 329                 if (chba) {
 330                         cdev->hbas[i] = NULL;
 331                         iscsi_host_remove(chba->shost);
 332                         pci_dev_put(cdev->pdev);
 333                         iscsi_host_free(chba->shost);
 334                 }
 335         }
 336 }
 337 EXPORT_SYMBOL_GPL(cxgbi_hbas_remove);
 338
 339 int cxgbi_hbas_add(struct cxgbi_device *cdev, u64 max_lun,
 340                 unsigned int max_id, struct scsi_host_template *sht,
 341                 struct scsi_transport_template *stt)
 342 {
 343         struct cxgbi_hba *chba;
 344         struct Scsi_Host *shost;
 345         int i, err;
 346
 347         log_debug(1 << CXGBI_DBG_DEV, "cdev 0x%p, p#%u.\n", cdev, cdev->nports);
 348
 349         for (i = 0; i < cdev->nports; i++) {
 350                 shost = iscsi_host_alloc(sht, sizeof(*chba), 1);
 351                 if (!shost) {
 352                         pr_info("0x%p, p%d, %s, host alloc failed.\n",
 353                                 cdev, i, cdev->ports[i]->name);
 354                         err = -ENOMEM;
 355                         goto err_out;
 356                 }
 357
 358                 shost->transportt = stt;
 359                 shost->max_lun = max_lun;
 360                 shost->max_id = max_id;
 361                 shost->max_channel = 0;
 362                 shost->max_cmd_len = 16;
 363
 364                 chba = iscsi_host_priv(shost);
 365                 chba->cdev = cdev;
 366                 chba->ndev = cdev->ports[i];
 367                 chba->shost = shost;
 368
 369                 log_debug(1 << CXGBI_DBG_DEV,
 370                         "cdev 0x%p, p#%d %s: chba 0x%p.\n",
 371                         cdev, i, cdev->ports[i]->name, chba);
 372
 373                 pci_dev_get(cdev->pdev);
 374                 err = iscsi_host_add(shost, &cdev->pdev->dev);
 375                 if (err) {
 376                         pr_info("cdev 0x%p, p#%d %s, host add failed.\n",
 377                                 cdev, i, cdev->ports[i]->name);
 378                         pci_dev_put(cdev->pdev);
 379                         scsi_host_put(shost);
 380                         goto  err_out;
 381                 }
 382
 383                 cdev->hbas[i] = chba;
 384         }
 385
 386         return 0;
 387
 388 err_out:
 389         cxgbi_hbas_remove(cdev);
 390         return err;
 391 }
 392 EXPORT_SYMBOL_GPL(cxgbi_hbas_add);
 393
 394 /*
 395  * iSCSI offload
 396  *
 397  * - source port management
 398  *   To find a free source port in the port allocation map we use a very simple
 399  *   rotor scheme to look for the next free port.
 400  *
 401  *   If a source port has been specified make sure that it doesn't collide with
 402  *   our normal source port allocation map.  If it's outside the range of our
 403  *   allocation/deallocation scheme just let them use it.
 404  *
 405  *   If the source port is outside our allocation range, the caller is
 406  *   responsible for keeping track of their port usage.
 407  */
 408
 409 static struct cxgbi_sock *find_sock_on_port(struct cxgbi_device *cdev,
 410                                             unsigned char port_id)
 411 {
 412         struct cxgbi_ports_map *pmap = &cdev->pmap;
 413         unsigned int i;
 414         unsigned int used;
 415
 416         if (!pmap->max_connect || !pmap->used)
 417                 return NULL;
 418
 419         spin_lock_bh(&pmap->lock);
 420         used = pmap->used;
 421         for (i = 0; used && i < pmap->max_connect; i++) {
 422                 struct cxgbi_sock *csk = pmap->port_csk[i];
 423
 424                 if (csk) {
 425                         if (csk->port_id == port_id) {
 426                                 spin_unlock_bh(&pmap->lock);
 427                                 return csk;
 428                         }
 429                         used--;
 430                 }
 431         }
 432         spin_unlock_bh(&pmap->lock);
 433
 434         return NULL;
 435 }
 436
 437 static int sock_get_port(struct cxgbi_sock *csk)
 438 {
 439         struct cxgbi_device *cdev = csk->cdev;
 440         struct cxgbi_ports_map *pmap = &cdev->pmap;
 441         unsigned int start;
 442         int idx;
 443         __be16 *port;
 444
 445         if (!pmap->max_connect) {
 446                 pr_err("cdev 0x%p, p#%u %s, NO port map.\n",
 447                            cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 448                 return -EADDRNOTAVAIL;
 449         }
 450
 451         if (csk->csk_family == AF_INET)
 452                 port = &csk->saddr.sin_port;
 453         else /* ipv6 */
 454                 port = &csk->saddr6.sin6_port;
 455
 456         if (*port) {
 457                 pr_err("source port NON-ZERO %u.\n",
 458                         ntohs(*port));
 459                 return -EADDRINUSE;
 460         }
 461
 462         spin_lock_bh(&pmap->lock);
 463         if (pmap->used >= pmap->max_connect) {
 464                 spin_unlock_bh(&pmap->lock);
 465                 pr_info("cdev 0x%p, p#%u %s, ALL ports used.\n",
 466                         cdev, csk->port_id, cdev->ports[csk->port_id]->name);
 467                 return -EADDRNOTAVAIL;
 468         }
 469
 470         start = idx = pmap->next;
 471         do {
 472                 if (++idx >= pmap->max_connect)
 473                         idx = 0;
 474                 if (!pmap->port_csk[idx]) {
 475                         pmap->used++;
 476                         *port = htons(pmap->sport_base + idx);
 477                         pmap->next = idx;
 478                         pmap->port_csk[idx] = csk;
 479                         spin_unlock_bh(&pmap->lock);
 480                         cxgbi_sock_get(csk);
 481                         log_debug(1 << CXGBI_DBG_SOCK,
 482                                 "cdev 0x%p, p#%u %s, p %u, %u.\n",
 483                                 cdev, csk->port_id,
 484                                 cdev->ports[csk->port_id]->name,
 485                                 pmap->sport_base + idx, pmap->next);
 486                         return 0;
 487                 }
 488         } while (idx != start);
 489         spin_unlock_bh(&pmap->lock);
 490
 491         /* should not happen */
 492         pr_warn("cdev 0x%p, p#%u %s, next %u?\n",
 493                 cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 494                 pmap->next);
 495         return -EADDRNOTAVAIL;
 496 }
 497
 498 static void sock_put_port(struct cxgbi_sock *csk)
 499 {
 500         struct cxgbi_device *cdev = csk->cdev;
 501         struct cxgbi_ports_map *pmap = &cdev->pmap;
 502         __be16 *port;
 503
 504         if (csk->csk_family == AF_INET)
 505                 port = &csk->saddr.sin_port;
 506         else /* ipv6 */
 507                 port = &csk->saddr6.sin6_port;
 508
 509         if (*port) {
 510                 int idx = ntohs(*port) - pmap->sport_base;
 511
 512                 *port = 0;
 513                 if (idx < 0 || idx >= pmap->max_connect) {
 514                         pr_err("cdev 0x%p, p#%u %s, port %u OOR.\n",
 515                                 cdev, csk->port_id,
 516                                 cdev->ports[csk->port_id]->name,
 517                                 ntohs(*port));
 518                         return;
 519                 }
 520
 521                 spin_lock_bh(&pmap->lock);
 522                 pmap->port_csk[idx] = NULL;
 523                 pmap->used--;
 524                 spin_unlock_bh(&pmap->lock);
 525
 526                 log_debug(1 << CXGBI_DBG_SOCK,
 527                         "cdev 0x%p, p#%u %s, release %u.\n",
 528                         cdev, csk->port_id, cdev->ports[csk->port_id]->name,
 529                         pmap->sport_base + idx);
 530
 531                 cxgbi_sock_put(csk);
 532         }
 533 }
 534
 535 /*
 536  * iscsi tcp connection
 537  */
 538 void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *csk)
 539 {
 540         if (csk->cpl_close) {
 541                 kfree_skb(csk->cpl_close);
 542                 csk->cpl_close = NULL;
 543         }
 544         if (csk->cpl_abort_req) {
 545                 kfree_skb(csk->cpl_abort_req);
 546                 csk->cpl_abort_req = NULL;
 547         }
 548         if (csk->cpl_abort_rpl) {
 549                 kfree_skb(csk->cpl_abort_rpl);
 550                 csk->cpl_abort_rpl = NULL;
 551         }
 552 }
 553 EXPORT_SYMBOL_GPL(cxgbi_sock_free_cpl_skbs);
 554
 555 static struct cxgbi_sock *cxgbi_sock_create(struct cxgbi_device *cdev)
 556 {
 557         struct cxgbi_sock *csk = kzalloc(sizeof(*csk), GFP_NOIO);
 558
 559         if (!csk) {
 560                 pr_info("alloc csk %zu failed.\n", sizeof(*csk));
 561                 return NULL;
 562         }
 563
 564         if (cdev->csk_alloc_cpls(csk) < 0) {
 565                 pr_info("csk 0x%p, alloc cpls failed.\n", csk);
 566                 kfree(csk);
 567                 return NULL;
 568         }
 569
 570         spin_lock_init(&csk->lock);
 571         kref_init(&csk->refcnt);
 572         skb_queue_head_init(&csk->receive_queue);
 573         skb_queue_head_init(&csk->write_queue);
 574         timer_setup(&csk->retry_timer, NULL, 0);
 575         init_completion(&csk->cmpl);
 576         rwlock_init(&csk->callback_lock);
 577         csk->cdev = cdev;
 578         csk->flags = 0;
 579         cxgbi_sock_set_state(csk, CTP_CLOSED);
 580
 581         log_debug(1 << CXGBI_DBG_SOCK, "cdev 0x%p, new csk 0x%p.\n", cdev, csk);
 582
 583         return csk;
 584 }
 585
 586 static struct rtable *find_route_ipv4(struct flowi4 *fl4,
 587                                       __be32 saddr, __be32 daddr,
 588                                       __be16 sport, __be16 dport, u8 tos,
 589                                       int ifindex)
 590 {
 591         struct rtable *rt;
 592
 593         rt = ip_route_output_ports(&init_net, fl4, NULL, daddr, saddr,
 594                                    dport, sport, IPPROTO_TCP, tos, ifindex);
 595         if (IS_ERR(rt))
 596                 return NULL;
 597
 598         return rt;
 599 }
 600
 601 static struct cxgbi_sock *
 602 cxgbi_check_route(struct sockaddr *dst_addr, int ifindex)
 603 {
 604         struct sockaddr_in *daddr = (struct sockaddr_in *)dst_addr;
 605         struct dst_entry *dst;
 606         struct net_device *ndev;
 607         struct cxgbi_device *cdev;
 608         struct rtable *rt = NULL;
 609         struct neighbour *n;
 610         struct flowi4 fl4;
 611         struct cxgbi_sock *csk = NULL;
 612         unsigned int mtu = 0;
 613         int port = 0xFFFF;
 614         int err = 0;
 615
 616         rt = find_route_ipv4(&fl4, 0, daddr->sin_addr.s_addr, 0,
 617                              daddr->sin_port, 0, ifindex);
 618         if (!rt) {
 619                 pr_info("no route to ipv4 0x%x, port %u.\n",
 620                         be32_to_cpu(daddr->sin_addr.s_addr),
 621                         be16_to_cpu(daddr->sin_port));
 622                 err = -ENETUNREACH;
 623                 goto err_out;
 624         }
 625         dst = &rt->dst;
 626         n = dst_neigh_lookup(dst, &daddr->sin_addr.s_addr);
 627         if (!n) {
 628                 err = -ENODEV;
 629                 goto rel_rt;
 630         }
 631         ndev = n->dev;
 632
 633         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
 634                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
 635                         &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 636                         ndev->name);
 637                 err = -ENETUNREACH;
 638                 goto rel_neigh;
 639         }
 640
 641         if (ndev->flags & IFF_LOOPBACK) {
 642                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
 643                 if (!ndev) {
 644                         err = -ENETUNREACH;
 645                         goto rel_neigh;
 646                 }
 647                 mtu = ndev->mtu;
 648                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 649                         n->dev->name, ndev->name, mtu);
 650         }
 651
 652         if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
 653                 pr_info("%s interface not up.\n", ndev->name);
 654                 err = -ENETDOWN;
 655                 goto rel_neigh;
 656         }
 657
 658         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 659         if (!cdev)
 660                 cdev = cxgbi_device_find_by_mac(ndev, &port);
 661         if (!cdev) {
 662                 pr_info("dst %pI4, %s, NOT cxgbi device.\n",
 663                         &daddr->sin_addr.s_addr, ndev->name);
 664                 err = -ENETUNREACH;
 665                 goto rel_neigh;
 666         }
 667         log_debug(1 << CXGBI_DBG_SOCK,
 668                 "route to %pI4 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 669                 &daddr->sin_addr.s_addr, ntohs(daddr->sin_port),
 670                            port, ndev->name, cdev);
 671
 672         csk = cxgbi_sock_create(cdev);
 673         if (!csk) {
 674                 err = -ENOMEM;
 675                 goto rel_neigh;
 676         }
 677         csk->cdev = cdev;
 678         csk->port_id = port;
 679         csk->mtu = mtu;
 680         csk->dst = dst;
 681
 682         csk->csk_family = AF_INET;
 683         csk->daddr.sin_addr.s_addr = daddr->sin_addr.s_addr;
 684         csk->daddr.sin_port = daddr->sin_port;
 685         csk->daddr.sin_family = daddr->sin_family;
 686         csk->saddr.sin_family = daddr->sin_family;
 687         csk->saddr.sin_addr.s_addr = fl4.saddr;
 688         neigh_release(n);
 689
 690         return csk;
 691
 692 rel_neigh:
 693         neigh_release(n);
 694
 695 rel_rt:
 696         ip_rt_put(rt);
 697 err_out:
 698         return ERR_PTR(err);
 699 }
 700
 701 #if IS_ENABLED(CONFIG_IPV6)
 702 static struct rt6_info *find_route_ipv6(const struct in6_addr *saddr,
 703                                         const struct in6_addr *daddr,
 704                                         int ifindex)
 705 {
 706         struct flowi6 fl;
 707
 708         memset(&fl, 0, sizeof(fl));
 709         fl.flowi6_oif = ifindex;
 710         if (saddr)
 711                 memcpy(&fl.saddr, saddr, sizeof(struct in6_addr));
 712         if (daddr)
 713                 memcpy(&fl.daddr, daddr, sizeof(struct in6_addr));
 714         return (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
 715 }
 716
 717 static struct cxgbi_sock *
 718 cxgbi_check_route6(struct sockaddr *dst_addr, int ifindex)
 719 {
 720         struct sockaddr_in6 *daddr6 = (struct sockaddr_in6 *)dst_addr;
 721         struct dst_entry *dst;
 722         struct net_device *ndev;
 723         struct cxgbi_device *cdev;
 724         struct rt6_info *rt = NULL;
 725         struct neighbour *n;
 726         struct in6_addr pref_saddr;
 727         struct cxgbi_sock *csk = NULL;
 728         unsigned int mtu = 0;
 729         int port = 0xFFFF;
 730         int err = 0;
 731
 732         rt = find_route_ipv6(NULL, &daddr6->sin6_addr, ifindex);
 733
 734         if (!rt) {
 735                 pr_info("no route to ipv6 %pI6 port %u\n",
 736                         daddr6->sin6_addr.s6_addr,
 737                         be16_to_cpu(daddr6->sin6_port));
 738                 err = -ENETUNREACH;
 739                 goto err_out;
 740         }
 741
 742         dst = &rt->dst;
 743
 744         n = dst_neigh_lookup(dst, &daddr6->sin6_addr);
 745
 746         if (!n) {
 747                 pr_info("%pI6, port %u, dst no neighbour.\n",
 748                         daddr6->sin6_addr.s6_addr,
 749                         be16_to_cpu(daddr6->sin6_port));
 750                 err = -ENETUNREACH;
 751                 goto rel_rt;
 752         }
 753         ndev = n->dev;
 754
 755         if (!(ndev->flags & IFF_UP) || !netif_carrier_ok(ndev)) {
 756                 pr_info("%s interface not up.\n", ndev->name);
 757                 err = -ENETDOWN;
 758                 goto rel_rt;
 759         }
 760
 761         if (ipv6_addr_is_multicast(&daddr6->sin6_addr)) {
 762                 pr_info("multi-cast route %pI6 port %u, dev %s.\n",
 763                         daddr6->sin6_addr.s6_addr,
 764                         ntohs(daddr6->sin6_port), ndev->name);
 765                 err = -ENETUNREACH;
 766                 goto rel_rt;
 767         }
 768
 769         cdev = cxgbi_device_find_by_netdev(ndev, &port);
 770         if (!cdev)
 771                 cdev = cxgbi_device_find_by_mac(ndev, &port);
 772         if (!cdev) {
 773                 pr_info("dst %pI6 %s, NOT cxgbi device.\n",
 774                         daddr6->sin6_addr.s6_addr, ndev->name);
 775                 err = -ENETUNREACH;
 776                 goto rel_rt;
 777         }
 778         log_debug(1 << CXGBI_DBG_SOCK,
 779                   "route to %pI6 :%u, ndev p#%d,%s, cdev 0x%p.\n",
 780                   daddr6->sin6_addr.s6_addr, ntohs(daddr6->sin6_port), port,
 781                   ndev->name, cdev);
 782
 783         csk = cxgbi_sock_create(cdev);
 784         if (!csk) {
 785                 err = -ENOMEM;
 786                 goto rel_rt;
 787         }
 788         csk->cdev = cdev;
 789         csk->port_id = port;
 790         csk->mtu = mtu;
 791         csk->dst = dst;
 792
 793         rt6_get_prefsrc(rt, &pref_saddr);
 794         if (ipv6_addr_any(&pref_saddr)) {
 795                 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
 796
 797                 err = ipv6_dev_get_saddr(&init_net, idev ? idev->dev : NULL,
 798                                          &daddr6->sin6_addr, 0, &pref_saddr);
 799                 if (err) {
 800                         pr_info("failed to get source address to reach %pI6\n",
 801                                 &daddr6->sin6_addr);
 802                         goto rel_rt;
 803                 }
 804         }
 805
 806         csk->csk_family = AF_INET6;
 807         csk->daddr6.sin6_addr = daddr6->sin6_addr;
 808         csk->daddr6.sin6_port = daddr6->sin6_port;
 809         csk->daddr6.sin6_family = daddr6->sin6_family;
 810         csk->saddr6.sin6_family = daddr6->sin6_family;
 811         csk->saddr6.sin6_addr = pref_saddr;
 812
 813         neigh_release(n);
 814         return csk;
 815
 816 rel_rt:
 817         if (n)
 818                 neigh_release(n);
 819
 820         ip6_rt_put(rt);
 821         if (csk)
 822                 cxgbi_sock_closed(csk);
 823 err_out:
 824         return ERR_PTR(err);
 825 }
 826 #endif /* IS_ENABLED(CONFIG_IPV6) */
 827
 828 void cxgbi_sock_established(struct cxgbi_sock *csk, unsigned int snd_isn,
 829                         unsigned int opt)
 830 {
 831         csk->write_seq = csk->snd_nxt = csk->snd_una = snd_isn;
 832         dst_confirm(csk->dst);
 833         smp_mb();
 834         cxgbi_sock_set_state(csk, CTP_ESTABLISHED);
 835 }
 836 EXPORT_SYMBOL_GPL(cxgbi_sock_established);
 837
 838 static void cxgbi_inform_iscsi_conn_closing(struct cxgbi_sock *csk)
 839 {
 840         log_debug(1 << CXGBI_DBG_SOCK,
 841                 "csk 0x%p, state %u, flags 0x%lx, conn 0x%p.\n",
 842                 csk, csk->state, csk->flags, csk->user_data);
 843
 844         if (csk->state != CTP_ESTABLISHED) {
 845                 read_lock_bh(&csk->callback_lock);
 846                 if (csk->user_data)
 847                         iscsi_conn_failure(csk->user_data,
 848                                         ISCSI_ERR_TCP_CONN_CLOSE);
 849                 read_unlock_bh(&csk->callback_lock);
 850         }
 851 }
 852
 853 void cxgbi_sock_closed(struct cxgbi_sock *csk)
 854 {
 855         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 856                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 857         cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 858         if (csk->state == CTP_ACTIVE_OPEN || csk->state == CTP_CLOSED)
 859                 return;
 860         if (csk->saddr.sin_port)
 861                 sock_put_port(csk);
 862         if (csk->dst)
 863                 dst_release(csk->dst);
 864         csk->cdev->csk_release_offload_resources(csk);
 865         cxgbi_sock_set_state(csk, CTP_CLOSED);
 866         cxgbi_inform_iscsi_conn_closing(csk);
 867         cxgbi_sock_put(csk);
 868 }
 869 EXPORT_SYMBOL_GPL(cxgbi_sock_closed);
 870
 871 static void need_active_close(struct cxgbi_sock *csk)
 872 {
 873         int data_lost;
 874         int close_req = 0;
 875
 876         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 877                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 878         spin_lock_bh(&csk->lock);
 879         if (csk->dst)
 880                 dst_confirm(csk->dst);
 881         data_lost = skb_queue_len(&csk->receive_queue);
 882         __skb_queue_purge(&csk->receive_queue);
 883
 884         if (csk->state == CTP_ACTIVE_OPEN)
 885                 cxgbi_sock_set_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED);
 886         else if (csk->state == CTP_ESTABLISHED) {
 887                 close_req = 1;
 888                 cxgbi_sock_set_state(csk, CTP_ACTIVE_CLOSE);
 889         } else if (csk->state == CTP_PASSIVE_CLOSE) {
 890                 close_req = 1;
 891                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 892         }
 893
 894         if (close_req) {
 895                 if (!cxgbi_sock_flag(csk, CTPF_LOGOUT_RSP_RCVD) ||
 896                     data_lost)
 897                         csk->cdev->csk_send_abort_req(csk);
 898                 else
 899                         csk->cdev->csk_send_close_req(csk);
 900         }
 901
 902         spin_unlock_bh(&csk->lock);
 903 }
 904
 905 void cxgbi_sock_fail_act_open(struct cxgbi_sock *csk, int errno)
 906 {
 907         pr_info("csk 0x%p,%u,%lx, %pI4:%u-%pI4:%u, err %d.\n",
 908                         csk, csk->state, csk->flags,
 909                         &csk->saddr.sin_addr.s_addr, csk->saddr.sin_port,
 910                         &csk->daddr.sin_addr.s_addr, csk->daddr.sin_port,
 911                         errno);
 912
 913         cxgbi_sock_set_state(csk, CTP_CONNECTING);
 914         csk->err = errno;
 915         cxgbi_sock_closed(csk);
 916 }
 917 EXPORT_SYMBOL_GPL(cxgbi_sock_fail_act_open);
 918
 919 void cxgbi_sock_act_open_req_arp_failure(void *handle, struct sk_buff *skb)
 920 {
 921         struct cxgbi_sock *csk = (struct cxgbi_sock *)skb->sk;
 922         struct module *owner = csk->cdev->owner;
 923
 924         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 925                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 926         cxgbi_sock_get(csk);
 927         spin_lock_bh(&csk->lock);
 928         if (csk->state == CTP_ACTIVE_OPEN)
 929                 cxgbi_sock_fail_act_open(csk, -EHOSTUNREACH);
 930         spin_unlock_bh(&csk->lock);
 931         cxgbi_sock_put(csk);
 932         __kfree_skb(skb);
 933
 934         module_put(owner);
 935 }
 936 EXPORT_SYMBOL_GPL(cxgbi_sock_act_open_req_arp_failure);
 937
 938 void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *csk)
 939 {
 940         cxgbi_sock_get(csk);
 941         spin_lock_bh(&csk->lock);
 942
 943         cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_RCVD);
 944         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
 945                 cxgbi_sock_clear_flag(csk, CTPF_ABORT_RPL_PENDING);
 946                 if (cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD))
 947                         pr_err("csk 0x%p,%u,0x%lx,%u,ABT_RPL_RSS.\n",
 948                                csk, csk->state, csk->flags, csk->tid);
 949                 cxgbi_sock_closed(csk);
 950         }
 951
 952         spin_unlock_bh(&csk->lock);
 953         cxgbi_sock_put(csk);
 954 }
 955 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_abort_rpl);
 956
 957 void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *csk)
 958 {
 959         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 960                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 961         cxgbi_sock_get(csk);
 962         spin_lock_bh(&csk->lock);
 963
 964         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 965                 goto done;
 966
 967         switch (csk->state) {
 968         case CTP_ESTABLISHED:
 969                 cxgbi_sock_set_state(csk, CTP_PASSIVE_CLOSE);
 970                 break;
 971         case CTP_ACTIVE_CLOSE:
 972                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_2);
 973                 break;
 974         case CTP_CLOSE_WAIT_1:
 975                 cxgbi_sock_closed(csk);
 976                 break;
 977         case CTP_ABORTING:
 978                 break;
 979         default:
 980                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
 981                         csk, csk->state, csk->flags, csk->tid);
 982         }
 983         cxgbi_inform_iscsi_conn_closing(csk);
 984 done:
 985         spin_unlock_bh(&csk->lock);
 986         cxgbi_sock_put(csk);
 987 }
 988 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_peer_close);
 989
 990 void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *csk, u32 snd_nxt)
 991 {
 992         log_debug(1 << CXGBI_DBG_SOCK, "csk 0x%p,%u,0x%lx,%u.\n",
 993                 csk, (csk)->state, (csk)->flags, (csk)->tid);
 994         cxgbi_sock_get(csk);
 995         spin_lock_bh(&csk->lock);
 996
 997         csk->snd_una = snd_nxt - 1;
 998         if (cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING))
 999                 goto done;
1000
1001         switch (csk->state) {
1002         case CTP_ACTIVE_CLOSE:
1003                 cxgbi_sock_set_state(csk, CTP_CLOSE_WAIT_1);
1004                 break;
1005         case CTP_CLOSE_WAIT_1:
1006         case CTP_CLOSE_WAIT_2:
1007                 cxgbi_sock_closed(csk);
1008                 break;
1009         case CTP_ABORTING:
1010                 break;
1011         default:
1012                 pr_err("csk 0x%p,%u,0x%lx,%u, bad state.\n",
1013                         csk, csk->state, csk->flags, csk->tid);
1014         }
1015 done:
1016         spin_unlock_bh(&csk->lock);
1017         cxgbi_sock_put(csk);
1018 }
1019 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_close_conn_rpl);
1020
1021 void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *csk, unsigned int credits,
1022                            unsigned int snd_una, int seq_chk)
1023 {
1024         log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
1025                         "csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, snd_una %u,%d.\n",
1026                         csk, csk->state, csk->flags, csk->tid, credits,
1027                         csk->wr_cred, csk->wr_una_cred, snd_una, seq_chk);
1028
1029         spin_lock_bh(&csk->lock);
1030
1031         csk->wr_cred += credits;
1032         if (csk->wr_una_cred > csk->wr_max_cred - csk->wr_cred)
1033                 csk->wr_una_cred = csk->wr_max_cred - csk->wr_cred;
1034
1035         while (credits) {
1036                 struct sk_buff *p = cxgbi_sock_peek_wr(csk);
1037
1038                 if (unlikely(!p)) {
1039                         pr_err("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, empty.\n",
1040                                 csk, csk->state, csk->flags, csk->tid, credits,
1041                                 csk->wr_cred, csk->wr_una_cred);
1042                         break;
1043                 }
1044
1045                 if (unlikely(credits < p->csum)) {
1046                         pr_warn("csk 0x%p,%u,0x%lx,%u, cr %u,%u+%u, < %u.\n",
1047                                 csk, csk->state, csk->flags, csk->tid,
1048                                 credits, csk->wr_cred, csk->wr_una_cred,
1049                                 p->csum);
1050                         p->csum -= credits;
1051                         break;
1052                 } else {
1053                         cxgbi_sock_dequeue_wr(csk);
1054                         credits -= p->csum;
1055                         kfree_skb(p);
1056                 }
1057         }
1058
1059         cxgbi_sock_check_wr_invariants(csk);
1060
1061         if (seq_chk) {
1062                 if (unlikely(before(snd_una, csk->snd_una))) {
1063                         pr_warn("csk 0x%p,%u,0x%lx,%u, snd_una %u/%u.",
1064                                 csk, csk->state, csk->flags, csk->tid, snd_una,
1065                                 csk->snd_una);
1066                         goto done;
1067                 }
1068
1069                 if (csk->snd_una != snd_una) {
1070                         csk->snd_una = snd_una;
1071                         dst_confirm(csk->dst);
1072                 }
1073         }
1074
1075         if (skb_queue_len(&csk->write_queue)) {
1076                 if (csk->cdev->csk_push_tx_frames(csk, 0))
1077                         cxgbi_conn_tx_open(csk);
1078         } else
1079                 cxgbi_conn_tx_open(csk);
1080 done:
1081         spin_unlock_bh(&csk->lock);
1082 }
1083 EXPORT_SYMBOL_GPL(cxgbi_sock_rcv_wr_ack);
1084
1085 static unsigned int cxgbi_sock_find_best_mtu(struct cxgbi_sock *csk,
1086                                              unsigned short mtu)
1087 {
1088         int i = 0;
1089
1090         while (i < csk->cdev->nmtus - 1 && csk->cdev->mtus[i + 1] <= mtu)
1091                 ++i;
1092
1093         return i;
1094 }
1095
1096 unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *csk, unsigned int pmtu)
1097 {
1098         unsigned int idx;
1099         struct dst_entry *dst = csk->dst;
1100
1101         csk->advmss = dst_metric_advmss(dst);
1102
1103         if (csk->advmss > pmtu - 40)
1104                 csk->advmss = pmtu - 40;
1105         if (csk->advmss < csk->cdev->mtus[0] - 40)
1106                 csk->advmss = csk->cdev->mtus[0] - 40;
1107         idx = cxgbi_sock_find_best_mtu(csk, csk->advmss + 40);
1108
1109         return idx;
1110 }
1111 EXPORT_SYMBOL_GPL(cxgbi_sock_select_mss);
1112
1113 void cxgbi_sock_skb_entail(struct cxgbi_sock *csk, struct sk_buff *skb)
1114 {
1115         cxgbi_skcb_tcp_seq(skb) = csk->write_seq;
1116         __skb_queue_tail(&csk->write_queue, skb);
1117 }
1118 EXPORT_SYMBOL_GPL(cxgbi_sock_skb_entail);
1119
1120 void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *csk)
1121 {
1122         struct sk_buff *skb;
1123
1124         while ((skb = cxgbi_sock_dequeue_wr(csk)) != NULL)
1125                 kfree_skb(skb);
1126 }
1127 EXPORT_SYMBOL_GPL(cxgbi_sock_purge_wr_queue);
1128
1129 void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *csk)
1130 {
1131         int pending = cxgbi_sock_count_pending_wrs(csk);
1132
1133         if (unlikely(csk->wr_cred + pending != csk->wr_max_cred))
1134                 pr_err("csk 0x%p, tid %u, credit %u + %u != %u.\n",
1135                         csk, csk->tid, csk->wr_cred, pending, csk->wr_max_cred);
1136 }
1137 EXPORT_SYMBOL_GPL(cxgbi_sock_check_wr_invariants);
1138
1139 static int cxgbi_sock_send_pdus(struct cxgbi_sock *csk, struct sk_buff *skb)
1140 {
1141         struct cxgbi_device *cdev = csk->cdev;
1142         struct sk_buff *next;
1143         int err, copied = 0;
1144
1145         spin_lock_bh(&csk->lock);
1146
1147         if (csk->state != CTP_ESTABLISHED) {
1148                 log_debug(1 << CXGBI_DBG_PDU_TX,
1149                         "csk 0x%p,%u,0x%lx,%u, EAGAIN.\n",
1150                         csk, csk->state, csk->flags, csk->tid);
1151                 err = -EAGAIN;
1152                 goto out_err;
1153         }
1154
1155         if (csk->err) {
1156                 log_debug(1 << CXGBI_DBG_PDU_TX,
1157                         "csk 0x%p,%u,0x%lx,%u, EPIPE %d.\n",
1158                         csk, csk->state, csk->flags, csk->tid, csk->err);
1159                 err = -EPIPE;
1160                 goto out_err;
1161         }
1162
1163         if (csk->write_seq - csk->snd_una >= csk->snd_win) {
1164                 log_debug(1 << CXGBI_DBG_PDU_TX,
1165                         "csk 0x%p,%u,0x%lx,%u, FULL %u-%u >= %u.\n",
1166                         csk, csk->state, csk->flags, csk->tid, csk->write_seq,
1167                         csk->snd_una, csk->snd_win);
1168                 err = -ENOBUFS;
1169                 goto out_err;
1170         }
1171
1172         while (skb) {
1173                 int frags = skb_shinfo(skb)->nr_frags +
1174                                 (skb->len != skb->data_len);
1175
1176                 if (unlikely(skb_headroom(skb) < cdev->skb_tx_rsvd)) {
1177                         pr_err("csk 0x%p, skb head %u < %u.\n",
1178                                 csk, skb_headroom(skb), cdev->skb_tx_rsvd);
1179                         err = -EINVAL;
1180                         goto out_err;
1181                 }
1182
1183                 if (frags >= SKB_WR_LIST_SIZE) {
1184                         pr_err("csk 0x%p, frags %d, %u,%u >%u.\n",
1185                                 csk, skb_shinfo(skb)->nr_frags, skb->len,
1186                                 skb->data_len, (uint)(SKB_WR_LIST_SIZE));
1187                         err = -EINVAL;
1188                         goto out_err;
1189                 }
1190
1191                 next = skb->next;
1192                 skb->next = NULL;
1193                 cxgbi_skcb_set_flag(skb, SKCBF_TX_NEED_HDR);
1194                 cxgbi_sock_skb_entail(csk, skb);
1195                 copied += skb->len;
1196                 csk->write_seq += skb->len +
1197                                 cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
1198                 skb = next;
1199         }
1200
1201         if (likely(skb_queue_len(&csk->write_queue)))
1202                 cdev->csk_push_tx_frames(csk, 1);
1203 done:
1204         spin_unlock_bh(&csk->lock);
1205         return copied;
1206
1207 out_err:
1208         if (copied == 0 && err == -EPIPE)
1209                 copied = csk->err ? csk->err : -EPIPE;
1210         else
1211                 copied = err;
1212         goto done;
1213 }
1214
1215 static inline void
1216 scmd_get_params(struct scsi_cmnd *sc, struct scatterlist **sgl,
1217                 unsigned int *sgcnt, unsigned int *dlen,
1218                 unsigned int prot)
1219 {
1220         struct scsi_data_buffer *sdb = prot ? scsi_prot(sc) : &sc->sdb;
1221
1222         *sgl = sdb->table.sgl;
1223         *sgcnt = sdb->table.nents;
1224         *dlen = sdb->length;
1225         /* Caution: for protection sdb, sdb->length is invalid */
1226 }
1227
1228 void cxgbi_ddp_set_one_ppod(struct cxgbi_pagepod *ppod,
1229                             struct cxgbi_task_tag_info *ttinfo,
1230                             struct scatterlist **sg_pp, unsigned int *sg_off)
1231 {
1232         struct scatterlist *sg = sg_pp ? *sg_pp : NULL;
1233         unsigned int offset = sg_off ? *sg_off : 0;
1234         dma_addr_t addr = 0UL;
1235         unsigned int len = 0;
1236         int i;
1237
1238         memcpy(ppod, &ttinfo->hdr, sizeof(struct cxgbi_pagepod_hdr));
1239
1240         if (sg) {
1241                 addr = sg_dma_address(sg);
1242                 len = sg_dma_len(sg);
1243         }
1244
1245         for (i = 0; i < PPOD_PAGES_MAX; i++) {
1246                 if (sg) {
1247                         ppod->addr[i] = cpu_to_be64(addr + offset);
1248                         offset += PAGE_SIZE;
1249                         if (offset == (len + sg->offset)) {
1250                                 offset = 0;
1251                                 sg = sg_next(sg);
1252                                 if (sg) {
1253                                         addr = sg_dma_address(sg);
1254                                         len = sg_dma_len(sg);
1255                                 }
1256                         }
1257                 } else {
1258                         ppod->addr[i] = 0ULL;
1259                 }
1260         }
1261
1262         /*
1263          * the fifth address needs to be repeated in the next ppod, so do
1264          * not move sg
1265          */
1266         if (sg_pp) {
1267                 *sg_pp = sg;
1268                 *sg_off = offset;
1269         }
1270
1271         if (offset == len) {
1272                 offset = 0;
1273                 sg = sg_next(sg);
1274                 if (sg) {
1275                         addr = sg_dma_address(sg);
1276                         len = sg_dma_len(sg);
1277                 }
1278         }
1279         ppod->addr[i] = sg ? cpu_to_be64(addr + offset) : 0ULL;
1280 }
1281 EXPORT_SYMBOL_GPL(cxgbi_ddp_set_one_ppod);
1282
1283 /*
1284  * APIs interacting with open-iscsi libraries
1285  */
1286
1287 static unsigned char padding[4];
1288
1289 int cxgbi_ddp_ppm_setup(void **ppm_pp, struct cxgbi_device *cdev,
1290                         struct cxgbi_tag_format *tformat,
1291                         unsigned int iscsi_size, unsigned int llimit,
1292                         unsigned int start, unsigned int rsvd_factor,
1293                         unsigned int edram_start, unsigned int edram_size)
1294 {
1295         int err = cxgbi_ppm_init(ppm_pp, cdev->ports[0], cdev->pdev,
1296                                 cdev->lldev, tformat, iscsi_size, llimit, start,
1297                                 rsvd_factor, edram_start, edram_size);
1298
1299         if (err >= 0) {
1300                 struct cxgbi_ppm *ppm = (struct cxgbi_ppm *)(*ppm_pp);
1301
1302                 if (ppm->ppmax < 1024 ||
1303                     ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX)
1304                         cdev->flags |= CXGBI_FLAG_DDP_OFF;
1305                 err = 0;
1306         } else {
1307                 cdev->flags |= CXGBI_FLAG_DDP_OFF;
1308         }
1309
1310         return err;
1311 }
1312 EXPORT_SYMBOL_GPL(cxgbi_ddp_ppm_setup);
1313
1314 static int cxgbi_ddp_sgl_check(struct scatterlist *sgl, int nents)
1315 {
1316         int i;
1317         int last_sgidx = nents - 1;
1318         struct scatterlist *sg = sgl;
1319
1320         for (i = 0; i < nents; i++, sg = sg_next(sg)) {
1321                 unsigned int len = sg->length + sg->offset;
1322
1323                 if ((sg->offset & 0x3) || (i && sg->offset) ||
1324                     ((i != last_sgidx) && len != PAGE_SIZE)) {
1325                         log_debug(1 << CXGBI_DBG_DDP,
1326                                   "sg %u/%u, %u,%u, not aligned.\n",
1327                                   i, nents, sg->offset, sg->length);
1328                         goto err_out;
1329                 }
1330         }
1331         return 0;
1332 err_out:
1333         return -EINVAL;
1334 }
1335
1336 static int cxgbi_ddp_reserve(struct cxgbi_conn *cconn,
1337                              struct cxgbi_task_data *tdata, u32 sw_tag,
1338                              unsigned int xferlen)
1339 {
1340         struct cxgbi_sock *csk = cconn->cep->csk;
1341         struct cxgbi_device *cdev = csk->cdev;
1342         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1343         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1344         struct scatterlist *sgl = ttinfo->sgl;
1345         unsigned int sgcnt = ttinfo->nents;
1346         unsigned int sg_offset = sgl->offset;
1347         int err;
1348
1349         if (cdev->flags & CXGBI_FLAG_DDP_OFF) {
1350                 log_debug(1 << CXGBI_DBG_DDP,
1351                           "cdev 0x%p DDP off.\n", cdev);
1352                 return -EINVAL;
1353         }
1354
1355         if (!ppm || xferlen < DDP_THRESHOLD || !sgcnt ||
1356             ppm->tformat.pgsz_idx_dflt >= DDP_PGIDX_MAX) {
1357                 log_debug(1 << CXGBI_DBG_DDP,
1358                           "ppm 0x%p, pgidx %u, xfer %u, sgcnt %u, NO ddp.\n",
1359                           ppm, ppm ? ppm->tformat.pgsz_idx_dflt : DDP_PGIDX_MAX,
1360                           xferlen, ttinfo->nents);
1361                 return -EINVAL;
1362         }
1363
1364         /* make sure the buffer is suitable for ddp */
1365         if (cxgbi_ddp_sgl_check(sgl, sgcnt) < 0)
1366                 return -EINVAL;
1367
1368         ttinfo->nr_pages = (xferlen + sgl->offset + (1 << PAGE_SHIFT) - 1) >>
1369                             PAGE_SHIFT;
1370
1371         /*
1372          * the ddp tag will be used for the itt in the outgoing pdu,
1373          * the itt genrated by libiscsi is saved in the ppm and can be
1374          * retrieved via the ddp tag
1375          */
1376         err = cxgbi_ppm_ppods_reserve(ppm, ttinfo->nr_pages, 0, &ttinfo->idx,
1377                                       &ttinfo->tag, (unsigned long)sw_tag);
1378         if (err < 0) {
1379                 cconn->ddp_full++;
1380                 return err;
1381         }
1382         ttinfo->npods = err;
1383
1384          /* setup dma from scsi command sgl */
1385         sgl->offset = 0;
1386         err = dma_map_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1387         sgl->offset = sg_offset;
1388         if (err == 0) {
1389                 pr_info("%s: 0x%x, xfer %u, sgl %u dma mapping err.\n",
1390                         __func__, sw_tag, xferlen, sgcnt);
1391                 goto rel_ppods;
1392         }
1393         if (err != ttinfo->nr_pages) {
1394                 log_debug(1 << CXGBI_DBG_DDP,
1395                           "%s: sw tag 0x%x, xfer %u, sgl %u, dma count %d.\n",
1396                           __func__, sw_tag, xferlen, sgcnt, err);
1397         }
1398
1399         ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_MAPPED;
1400         ttinfo->cid = csk->port_id;
1401
1402         cxgbi_ppm_make_ppod_hdr(ppm, ttinfo->tag, csk->tid, sgl->offset,
1403                                 xferlen, &ttinfo->hdr);
1404
1405         if (cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ) {
1406                 /* write ppod from xmit_pdu (of iscsi_scsi_command pdu) */
1407                 ttinfo->flags |= CXGBI_PPOD_INFO_FLAG_VALID;
1408         } else {
1409                 /* write ppod from control queue now */
1410                 err = cdev->csk_ddp_set_map(ppm, csk, ttinfo);
1411                 if (err < 0)
1412                         goto rel_ppods;
1413         }
1414
1415         return 0;
1416
1417 rel_ppods:
1418         cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1419
1420         if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_MAPPED) {
1421                 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_MAPPED;
1422                 dma_unmap_sg(&ppm->pdev->dev, sgl, sgcnt, DMA_FROM_DEVICE);
1423         }
1424         return -EINVAL;
1425 }
1426
1427 static void task_release_itt(struct iscsi_task *task, itt_t hdr_itt)
1428 {
1429         struct scsi_cmnd *sc = task->sc;
1430         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1431         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1432         struct cxgbi_device *cdev = cconn->chba->cdev;
1433         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1434         u32 tag = ntohl((__force u32)hdr_itt);
1435
1436         log_debug(1 << CXGBI_DBG_DDP,
1437                   "cdev 0x%p, task 0x%p, release tag 0x%x.\n",
1438                   cdev, task, tag);
1439         if (sc && sc->sc_data_direction == DMA_FROM_DEVICE &&
1440             cxgbi_ppm_is_ddp_tag(ppm, tag)) {
1441                 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1442                 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1443
1444                 if (!(cdev->flags & CXGBI_FLAG_USE_PPOD_OFLDQ))
1445                         cdev->csk_ddp_clear_map(cdev, ppm, ttinfo);
1446                 cxgbi_ppm_ppod_release(ppm, ttinfo->idx);
1447                 dma_unmap_sg(&ppm->pdev->dev, ttinfo->sgl, ttinfo->nents,
1448                              DMA_FROM_DEVICE);
1449         }
1450 }
1451
1452 static inline u32 cxgbi_build_sw_tag(u32 idx, u32 age)
1453 {
1454         /* assume idx and age both are < 0x7FFF (32767) */
1455         return (idx << 16) | age;
1456 }
1457
1458 static int task_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
1459 {
1460         struct scsi_cmnd *sc = task->sc;
1461         struct iscsi_conn *conn = task->conn;
1462         struct iscsi_session *sess = conn->session;
1463         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1464         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1465         struct cxgbi_device *cdev = cconn->chba->cdev;
1466         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1467         u32 sw_tag = cxgbi_build_sw_tag(task->itt, sess->age);
1468         u32 tag = 0;
1469         int err = -EINVAL;
1470
1471         if (sc && sc->sc_data_direction == DMA_FROM_DEVICE) {
1472                 struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1473                 struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
1474
1475                 scmd_get_params(sc, &ttinfo->sgl, &ttinfo->nents,
1476                                 &tdata->dlen, 0);
1477                 err = cxgbi_ddp_reserve(cconn, tdata, sw_tag, tdata->dlen);
1478                 if (!err)
1479                         tag = ttinfo->tag;
1480                 else
1481                          log_debug(1 << CXGBI_DBG_DDP,
1482                                    "csk 0x%p, R task 0x%p, %u,%u, no ddp.\n",
1483                                    cconn->cep->csk, task, tdata->dlen,
1484                                    ttinfo->nents);
1485         }
1486
1487         if (err < 0) {
1488                 err = cxgbi_ppm_make_non_ddp_tag(ppm, sw_tag, &tag);
1489                 if (err < 0)
1490                         return err;
1491         }
1492         /*  the itt need to sent in big-endian order */
1493         *hdr_itt = (__force itt_t)htonl(tag);
1494
1495         log_debug(1 << CXGBI_DBG_DDP,
1496                   "cdev 0x%p, task 0x%p, 0x%x(0x%x,0x%x)->0x%x/0x%x.\n",
1497                   cdev, task, sw_tag, task->itt, sess->age, tag, *hdr_itt);
1498         return 0;
1499 }
1500
1501 void cxgbi_parse_pdu_itt(struct iscsi_conn *conn, itt_t itt, int *idx, int *age)
1502 {
1503         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1504         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1505         struct cxgbi_device *cdev = cconn->chba->cdev;
1506         struct cxgbi_ppm *ppm = cdev->cdev2ppm(cdev);
1507         u32 tag = ntohl((__force u32)itt);
1508         u32 sw_bits;
1509
1510         if (ppm) {
1511                 if (cxgbi_ppm_is_ddp_tag(ppm, tag))
1512                         sw_bits = cxgbi_ppm_get_tag_caller_data(ppm, tag);
1513                 else
1514                         sw_bits = cxgbi_ppm_decode_non_ddp_tag(ppm, tag);
1515         } else {
1516                 sw_bits = tag;
1517         }
1518
1519         cxgbi_decode_sw_tag(sw_bits, idx, age);
1520         log_debug(1 << CXGBI_DBG_DDP,
1521                   "cdev 0x%p, tag 0x%x/0x%x, -> 0x%x(0x%x,0x%x).\n",
1522                   cdev, tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
1523                   age ? *age : 0xFF);
1524 }
1525 EXPORT_SYMBOL_GPL(cxgbi_parse_pdu_itt);
1526
1527 void cxgbi_conn_tx_open(struct cxgbi_sock *csk)
1528 {
1529         struct iscsi_conn *conn = csk->user_data;
1530
1531         if (conn) {
1532                 log_debug(1 << CXGBI_DBG_SOCK,
1533                         "csk 0x%p, cid %d.\n", csk, conn->id);
1534                 iscsi_conn_queue_work(conn);
1535         }
1536 }
1537 EXPORT_SYMBOL_GPL(cxgbi_conn_tx_open);
1538
1539 /*
1540  * pdu receive, interact with libiscsi_tcp
1541  */
1542 static inline int read_pdu_skb(struct iscsi_conn *conn,
1543                                struct sk_buff *skb,
1544                                unsigned int offset,
1545                                int offloaded)
1546 {
1547         int status = 0;
1548         int bytes_read;
1549
1550         bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
1551         switch (status) {
1552         case ISCSI_TCP_CONN_ERR:
1553                 pr_info("skb 0x%p, off %u, %d, TCP_ERR.\n",
1554                           skb, offset, offloaded);
1555                 return -EIO;
1556         case ISCSI_TCP_SUSPENDED:
1557                 log_debug(1 << CXGBI_DBG_PDU_RX,
1558                         "skb 0x%p, off %u, %d, TCP_SUSPEND, rc %d.\n",
1559                         skb, offset, offloaded, bytes_read);
1560                 /* no transfer - just have caller flush queue */
1561                 return bytes_read;
1562         case ISCSI_TCP_SKB_DONE:
1563                 pr_info("skb 0x%p, off %u, %d, TCP_SKB_DONE.\n",
1564                         skb, offset, offloaded);
1565                 /*
1566                  * pdus should always fit in the skb and we should get
1567                  * segment done notifcation.
1568                  */
1569                 iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
1570                 return -EFAULT;
1571         case ISCSI_TCP_SEGMENT_DONE:
1572                 log_debug(1 << CXGBI_DBG_PDU_RX,
1573                         "skb 0x%p, off %u, %d, TCP_SEG_DONE, rc %d.\n",
1574                         skb, offset, offloaded, bytes_read);
1575                 return bytes_read;
1576         default:
1577                 pr_info("skb 0x%p, off %u, %d, invalid status %d.\n",
1578                         skb, offset, offloaded, status);
1579                 return -EINVAL;
1580         }
1581 }
1582
1583 static int
1584 skb_read_pdu_bhs(struct cxgbi_sock *csk, struct iscsi_conn *conn,
1585                  struct sk_buff *skb)
1586 {
1587         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1588         int err;
1589
1590         log_debug(1 << CXGBI_DBG_PDU_RX,
1591                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1592                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1593
1594         if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
1595                 pr_info("conn 0x%p, skb 0x%p, not hdr.\n", conn, skb);
1596                 iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
1597                 return -EIO;
1598         }
1599
1600         if (conn->hdrdgst_en &&
1601             cxgbi_skcb_test_flag(skb, SKCBF_RX_HCRC_ERR)) {
1602                 pr_info("conn 0x%p, skb 0x%p, hcrc.\n", conn, skb);
1603                 iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
1604                 return -EIO;
1605         }
1606
1607         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_ISCSI_COMPL) &&
1608             cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA_DDPD)) {
1609                 /* If completion flag is set and data is directly
1610                  * placed in to the host memory then update
1611                  * task->exp_datasn to the datasn in completion
1612                  * iSCSI hdr as T6 adapter generates completion only
1613                  * for the last pdu of a sequence.
1614                  */
1615                 itt_t itt = ((struct iscsi_data *)skb->data)->itt;
1616                 struct iscsi_task *task = iscsi_itt_to_ctask(conn, itt);
1617                 u32 data_sn = be32_to_cpu(((struct iscsi_data *)
1618                                                         skb->data)->datasn);
1619                 if (task && task->sc) {
1620                         struct iscsi_tcp_task *tcp_task = task->dd_data;
1621
1622                         tcp_task->exp_datasn = data_sn;
1623                 }
1624         }
1625
1626         err = read_pdu_skb(conn, skb, 0, 0);
1627         if (likely(err >= 0)) {
1628                 struct iscsi_hdr *hdr = (struct iscsi_hdr *)skb->data;
1629                 u8 opcode = hdr->opcode & ISCSI_OPCODE_MASK;
1630
1631                 if (unlikely(opcode == ISCSI_OP_LOGOUT_RSP))
1632                         cxgbi_sock_set_flag(csk, CTPF_LOGOUT_RSP_RCVD);
1633         }
1634
1635         return err;
1636 }
1637
1638 static int skb_read_pdu_data(struct iscsi_conn *conn, struct sk_buff *lskb,
1639                              struct sk_buff *skb, unsigned int offset)
1640 {
1641         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
1642         bool offloaded = 0;
1643         int opcode = tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK;
1644
1645         log_debug(1 << CXGBI_DBG_PDU_RX,
1646                 "conn 0x%p, skb 0x%p, len %u, flag 0x%lx.\n",
1647                 conn, skb, skb->len, cxgbi_skcb_flags(skb));
1648
1649         if (conn->datadgst_en &&
1650             cxgbi_skcb_test_flag(lskb, SKCBF_RX_DCRC_ERR)) {
1651                 pr_info("conn 0x%p, skb 0x%p, dcrc 0x%lx.\n",
1652                         conn, lskb, cxgbi_skcb_flags(lskb));
1653                 iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
1654                 return -EIO;
1655         }
1656
1657         if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
1658                 return 0;
1659
1660         /* coalesced, add header digest length */
1661         if (lskb == skb && conn->hdrdgst_en)
1662                 offset += ISCSI_DIGEST_SIZE;
1663
1664         if (cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA_DDPD))
1665                 offloaded = 1;
1666
1667         if (opcode == ISCSI_OP_SCSI_DATA_IN)
1668                 log_debug(1 << CXGBI_DBG_PDU_RX,
1669                         "skb 0x%p, op 0x%x, itt 0x%x, %u %s ddp'ed.\n",
1670                         skb, opcode, ntohl(tcp_conn->in.hdr->itt),
1671                         tcp_conn->in.datalen, offloaded ? "is" : "not");
1672
1673         return read_pdu_skb(conn, skb, offset, offloaded);
1674 }
1675
1676 static void csk_return_rx_credits(struct cxgbi_sock *csk, int copied)
1677 {
1678         struct cxgbi_device *cdev = csk->cdev;
1679         int must_send;
1680         u32 credits;
1681
1682         log_debug(1 << CXGBI_DBG_PDU_RX,
1683                 "csk 0x%p,%u,0x%lx,%u, seq %u, wup %u, thre %u, %u.\n",
1684                 csk, csk->state, csk->flags, csk->tid, csk->copied_seq,
1685                 csk->rcv_wup, cdev->rx_credit_thres,
1686                 csk->rcv_win);
1687
1688         if (!cdev->rx_credit_thres)
1689                 return;
1690
1691         if (csk->state != CTP_ESTABLISHED)
1692                 return;
1693
1694         credits = csk->copied_seq - csk->rcv_wup;
1695         if (unlikely(!credits))
1696                 return;
1697         must_send = credits + 16384 >= csk->rcv_win;
1698         if (must_send || credits >= cdev->rx_credit_thres)
1699                 csk->rcv_wup += cdev->csk_send_rx_credits(csk, credits);
1700 }
1701
1702 void cxgbi_conn_pdu_ready(struct cxgbi_sock *csk)
1703 {
1704         struct cxgbi_device *cdev = csk->cdev;
1705         struct iscsi_conn *conn = csk->user_data;
1706         struct sk_buff *skb;
1707         unsigned int read = 0;
1708         int err = 0;
1709
1710         log_debug(1 << CXGBI_DBG_PDU_RX,
1711                 "csk 0x%p, conn 0x%p.\n", csk, conn);
1712
1713         if (unlikely(!conn || conn->suspend_rx)) {
1714                 log_debug(1 << CXGBI_DBG_PDU_RX,
1715                         "csk 0x%p, conn 0x%p, id %d, suspend_rx %lu!\n",
1716                         csk, conn, conn ? conn->id : 0xFF,
1717                         conn ? conn->suspend_rx : 0xFF);
1718                 return;
1719         }
1720
1721         while (!err) {
1722                 skb = skb_peek(&csk->receive_queue);
1723                 if (!skb ||
1724                     !(cxgbi_skcb_test_flag(skb, SKCBF_RX_STATUS))) {
1725                         if (skb)
1726                                 log_debug(1 << CXGBI_DBG_PDU_RX,
1727                                         "skb 0x%p, NOT ready 0x%lx.\n",
1728                                         skb, cxgbi_skcb_flags(skb));
1729                         break;
1730                 }
1731                 __skb_unlink(skb, &csk->receive_queue);
1732
1733                 read += cxgbi_skcb_rx_pdulen(skb);
1734                 log_debug(1 << CXGBI_DBG_PDU_RX,
1735                         "csk 0x%p, skb 0x%p,%u,f 0x%lx, pdu len %u.\n",
1736                         csk, skb, skb->len, cxgbi_skcb_flags(skb),
1737                         cxgbi_skcb_rx_pdulen(skb));
1738
1739                 if (cxgbi_skcb_test_flag(skb, SKCBF_RX_COALESCED)) {
1740                         err = skb_read_pdu_bhs(csk, conn, skb);
1741                         if (err < 0) {
1742                                 pr_err("coalesced bhs, csk 0x%p, skb 0x%p,%u, "
1743                                         "f 0x%lx, plen %u.\n",
1744                                         csk, skb, skb->len,
1745                                         cxgbi_skcb_flags(skb),
1746                                         cxgbi_skcb_rx_pdulen(skb));
1747                                 goto skb_done;
1748                         }
1749                         err = skb_read_pdu_data(conn, skb, skb,
1750                                                 err + cdev->skb_rx_extra);
1751                         if (err < 0)
1752                                 pr_err("coalesced data, csk 0x%p, skb 0x%p,%u, "
1753                                         "f 0x%lx, plen %u.\n",
1754                                         csk, skb, skb->len,
1755                                         cxgbi_skcb_flags(skb),
1756                                         cxgbi_skcb_rx_pdulen(skb));
1757                 } else {
1758                         err = skb_read_pdu_bhs(csk, conn, skb);
1759                         if (err < 0) {
1760                                 pr_err("bhs, csk 0x%p, skb 0x%p,%u, "
1761                                         "f 0x%lx, plen %u.\n",
1762                                         csk, skb, skb->len,
1763                                         cxgbi_skcb_flags(skb),
1764                                         cxgbi_skcb_rx_pdulen(skb));
1765                                 goto skb_done;
1766                         }
1767
1768                         if (cxgbi_skcb_test_flag(skb, SKCBF_RX_DATA)) {
1769                                 struct sk_buff *dskb;
1770
1771                                 dskb = skb_peek(&csk->receive_queue);
1772                                 if (!dskb) {
1773                                         pr_err("csk 0x%p, skb 0x%p,%u, f 0x%lx,"
1774                                                 " plen %u, NO data.\n",
1775                                                 csk, skb, skb->len,
1776                                                 cxgbi_skcb_flags(skb),
1777                                                 cxgbi_skcb_rx_pdulen(skb));
1778                                         err = -EIO;
1779                                         goto skb_done;
1780                                 }
1781                                 __skb_unlink(dskb, &csk->receive_queue);
1782
1783                                 err = skb_read_pdu_data(conn, skb, dskb, 0);
1784                                 if (err < 0)
1785                                         pr_err("data, csk 0x%p, skb 0x%p,%u, "
1786                                                 "f 0x%lx, plen %u, dskb 0x%p,"
1787                                                 "%u.\n",
1788                                                 csk, skb, skb->len,
1789                                                 cxgbi_skcb_flags(skb),
1790                                                 cxgbi_skcb_rx_pdulen(skb),
1791                                                 dskb, dskb->len);
1792                                 __kfree_skb(dskb);
1793                         } else
1794                                 err = skb_read_pdu_data(conn, skb, skb, 0);
1795                 }
1796 skb_done:
1797                 __kfree_skb(skb);
1798
1799                 if (err < 0)
1800                         break;
1801         }
1802
1803         log_debug(1 << CXGBI_DBG_PDU_RX, "csk 0x%p, read %u.\n", csk, read);
1804         if (read) {
1805                 csk->copied_seq += read;
1806                 csk_return_rx_credits(csk, read);
1807                 conn->rxdata_octets += read;
1808         }
1809
1810         if (err < 0) {
1811                 pr_info("csk 0x%p, 0x%p, rx failed %d, read %u.\n",
1812                         csk, conn, err, read);
1813                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1814         }
1815 }
1816 EXPORT_SYMBOL_GPL(cxgbi_conn_pdu_ready);
1817
1818 static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
1819                                 unsigned int offset, unsigned int *off,
1820                                 struct scatterlist **sgp)
1821 {
1822         int i;
1823         struct scatterlist *sg;
1824
1825         for_each_sg(sgl, sg, sgcnt, i) {
1826                 if (offset < sg->length) {
1827                         *off = offset;
1828                         *sgp = sg;
1829                         return 0;
1830                 }
1831                 offset -= sg->length;
1832         }
1833         return -EFAULT;
1834 }
1835
1836 static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
1837                                 unsigned int dlen, struct page_frag *frags,
1838                                 int frag_max)
1839 {
1840         unsigned int datalen = dlen;
1841         unsigned int sglen = sg->length - sgoffset;
1842         struct page *page = sg_page(sg);
1843         int i;
1844
1845         i = 0;
1846         do {
1847                 unsigned int copy;
1848
1849                 if (!sglen) {
1850                         sg = sg_next(sg);
1851                         if (!sg) {
1852                                 pr_warn("sg %d NULL, len %u/%u.\n",
1853                                         i, datalen, dlen);
1854                                 return -EINVAL;
1855                         }
1856                         sgoffset = 0;
1857                         sglen = sg->length;
1858                         page = sg_page(sg);
1859
1860                 }
1861                 copy = min(datalen, sglen);
1862                 if (i && page == frags[i - 1].page &&
1863                     sgoffset + sg->offset ==
1864                         frags[i - 1].offset + frags[i - 1].size) {
1865                         frags[i - 1].size += copy;
1866                 } else {
1867                         if (i >= frag_max) {
1868                                 pr_warn("too many pages %u, dlen %u.\n",
1869                                         frag_max, dlen);
1870                                 return -EINVAL;
1871                         }
1872
1873                         frags[i].page = page;
1874                         frags[i].offset = sg->offset + sgoffset;
1875                         frags[i].size = copy;
1876                         i++;
1877                 }
1878                 datalen -= copy;
1879                 sgoffset += copy;
1880                 sglen -= copy;
1881         } while (datalen);
1882
1883         return i;
1884 }
1885
1886 int cxgbi_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
1887 {
1888         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
1889         struct cxgbi_conn *cconn = tcp_conn->dd_data;
1890         struct cxgbi_device *cdev = cconn->chba->cdev;
1891         struct iscsi_conn *conn = task->conn;
1892         struct iscsi_tcp_task *tcp_task = task->dd_data;
1893         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1894         struct scsi_cmnd *sc = task->sc;
1895         struct cxgbi_sock *csk = cconn->cep->csk;
1896         struct net_device *ndev = cdev->ports[csk->port_id];
1897         int headroom = SKB_TX_ISCSI_PDU_HEADER_MAX;
1898
1899         tcp_task->dd_data = tdata;
1900         task->hdr = NULL;
1901
1902         if (SKB_MAX_HEAD(cdev->skb_tx_rsvd) > (512 * MAX_SKB_FRAGS) &&
1903             (opcode == ISCSI_OP_SCSI_DATA_OUT ||
1904              (opcode == ISCSI_OP_SCSI_CMD &&
1905               sc->sc_data_direction == DMA_TO_DEVICE)))
1906                 /* data could goes into skb head */
1907                 headroom += min_t(unsigned int,
1908                                 SKB_MAX_HEAD(cdev->skb_tx_rsvd),
1909                                 conn->max_xmit_dlength);
1910
1911         tdata->skb = alloc_skb(cdev->skb_tx_rsvd + headroom, GFP_ATOMIC);
1912         if (!tdata->skb) {
1913                 ndev->stats.tx_dropped++;
1914                 return -ENOMEM;
1915         }
1916
1917         skb_reserve(tdata->skb, cdev->skb_tx_rsvd);
1918
1919         if (task->sc) {
1920                 task->hdr = (struct iscsi_hdr *)tdata->skb->data;
1921         } else {
1922                 task->hdr = kzalloc(SKB_TX_ISCSI_PDU_HEADER_MAX, GFP_ATOMIC);
1923                 if (!task->hdr) {
1924                         __kfree_skb(tdata->skb);
1925                         tdata->skb = NULL;
1926                         ndev->stats.tx_dropped++;
1927                         return -ENOMEM;
1928                 }
1929         }
1930         task->hdr_max = SKB_TX_ISCSI_PDU_HEADER_MAX; /* BHS + AHS */
1931
1932         /* data_out uses scsi_cmd's itt */
1933         if (opcode != ISCSI_OP_SCSI_DATA_OUT)
1934                 task_reserve_itt(task, &task->hdr->itt);
1935
1936         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1937                 "task 0x%p, op 0x%x, skb 0x%p,%u+%u/%u, itt 0x%x.\n",
1938                 task, opcode, tdata->skb, cdev->skb_tx_rsvd, headroom,
1939                 conn->max_xmit_dlength, ntohl(task->hdr->itt));
1940
1941         return 0;
1942 }
1943 EXPORT_SYMBOL_GPL(cxgbi_conn_alloc_pdu);
1944
1945 static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
1946 {
1947         if (hcrc || dcrc) {
1948                 u8 submode = 0;
1949
1950                 if (hcrc)
1951                         submode |= 1;
1952                 if (dcrc)
1953                         submode |= 2;
1954                 cxgbi_skcb_ulp_mode(skb) = (ULP2_MODE_ISCSI << 4) | submode;
1955         } else
1956                 cxgbi_skcb_ulp_mode(skb) = 0;
1957 }
1958
1959 int cxgbi_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
1960                               unsigned int count)
1961 {
1962         struct iscsi_conn *conn = task->conn;
1963         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
1964         struct sk_buff *skb = tdata->skb;
1965         unsigned int datalen = count;
1966         int i, padlen = iscsi_padding(count);
1967         struct page *pg;
1968
1969         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
1970                 "task 0x%p,0x%p, skb 0x%p, 0x%x,0x%x,0x%x, %u+%u.\n",
1971                 task, task->sc, skb, (*skb->data) & ISCSI_OPCODE_MASK,
1972                 ntohl(task->cmdsn), ntohl(task->hdr->itt), offset, count);
1973
1974         skb_put(skb, task->hdr_len);
1975         tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
1976         if (!count)
1977                 return 0;
1978
1979         if (task->sc) {
1980                 struct scsi_data_buffer *sdb = &task->sc->sdb;
1981                 struct scatterlist *sg = NULL;
1982                 int err;
1983
1984                 tdata->offset = offset;
1985                 tdata->count = count;
1986                 err = sgl_seek_offset(
1987                                         sdb->table.sgl, sdb->table.nents,
1988                                         tdata->offset, &tdata->sgoffset, &sg);
1989                 if (err < 0) {
1990                         pr_warn("tpdu, sgl %u, bad offset %u/%u.\n",
1991                                 sdb->table.nents, tdata->offset, sdb->length);
1992                         return err;
1993                 }
1994                 err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
1995                                         tdata->frags, MAX_PDU_FRAGS);
1996                 if (err < 0) {
1997                         pr_warn("tpdu, sgl %u, bad offset %u + %u.\n",
1998                                 sdb->table.nents, tdata->offset, tdata->count);
1999                         return err;
2000                 }
2001                 tdata->nr_frags = err;
2002
2003                 if (tdata->nr_frags > MAX_SKB_FRAGS ||
2004                     (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
2005                         char *dst = skb->data + task->hdr_len;
2006                         struct page_frag *frag = tdata->frags;
2007
2008                         /* data fits in the skb's headroom */
2009                         for (i = 0; i < tdata->nr_frags; i++, frag++) {
2010                                 char *src = kmap_atomic(frag->page);
2011
2012                                 memcpy(dst, src+frag->offset, frag->size);
2013                                 dst += frag->size;
2014                                 kunmap_atomic(src);
2015                         }
2016                         if (padlen) {
2017                                 memset(dst, 0, padlen);
2018                                 padlen = 0;
2019                         }
2020                         skb_put(skb, count + padlen);
2021                 } else {
2022                         /* data fit into frag_list */
2023                         for (i = 0; i < tdata->nr_frags; i++) {
2024                                 __skb_fill_page_desc(skb, i,
2025                                                 tdata->frags[i].page,
2026                                                 tdata->frags[i].offset,
2027                                                 tdata->frags[i].size);
2028                                 skb_frag_ref(skb, i);
2029                         }
2030                         skb_shinfo(skb)->nr_frags = tdata->nr_frags;
2031                         skb->len += count;
2032                         skb->data_len += count;
2033                         skb->truesize += count;
2034                 }
2035
2036         } else {
2037                 pg = virt_to_page(task->data);
2038
2039                 get_page(pg);
2040                 skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
2041                                         count);
2042                 skb->len += count;
2043                 skb->data_len += count;
2044                 skb->truesize += count;
2045         }
2046
2047         if (padlen) {
2048                 i = skb_shinfo(skb)->nr_frags;
2049                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
2050                                 virt_to_page(padding), offset_in_page(padding),
2051                                 padlen);
2052
2053                 skb->data_len += padlen;
2054                 skb->truesize += padlen;
2055                 skb->len += padlen;
2056         }
2057
2058         return 0;
2059 }
2060 EXPORT_SYMBOL_GPL(cxgbi_conn_init_pdu);
2061
2062 int cxgbi_conn_xmit_pdu(struct iscsi_task *task)
2063 {
2064         struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
2065         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2066         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2067         struct cxgbi_task_tag_info *ttinfo = &tdata->ttinfo;
2068         struct sk_buff *skb = tdata->skb;
2069         struct cxgbi_sock *csk = NULL;
2070         unsigned int datalen;
2071         int err;
2072
2073         if (!skb) {
2074                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2075                         "task 0x%p\n", task);
2076                 return 0;
2077         }
2078
2079         if (cconn && cconn->cep)
2080                 csk = cconn->cep->csk;
2081         if (!csk) {
2082                 log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2083                           "task 0x%p, csk gone.\n", task);
2084                 return -EPIPE;
2085         }
2086
2087         tdata->skb = NULL;
2088         datalen = skb->data_len;
2089
2090         /* write ppod first if using ofldq to write ppod */
2091         if (ttinfo->flags & CXGBI_PPOD_INFO_FLAG_VALID) {
2092                 struct cxgbi_ppm *ppm = csk->cdev->cdev2ppm(csk->cdev);
2093
2094                 ttinfo->flags &= ~CXGBI_PPOD_INFO_FLAG_VALID;
2095                 if (csk->cdev->csk_ddp_set_map(ppm, csk, ttinfo) < 0)
2096                         pr_err("task 0x%p, ppod writing using ofldq failed.\n",
2097                                task);
2098                         /* continue. Let fl get the data */
2099         }
2100
2101         if (!task->sc)
2102                 memcpy(skb->data, task->hdr, SKB_TX_ISCSI_PDU_HEADER_MAX);
2103
2104         err = cxgbi_sock_send_pdus(cconn->cep->csk, skb);
2105         if (err > 0) {
2106                 int pdulen = err;
2107
2108                 log_debug(1 << CXGBI_DBG_PDU_TX,
2109                         "task 0x%p,0x%p, skb 0x%p, len %u/%u, rv %d.\n",
2110                         task, task->sc, skb, skb->len, skb->data_len, err);
2111
2112                 if (task->conn->hdrdgst_en)
2113                         pdulen += ISCSI_DIGEST_SIZE;
2114
2115                 if (datalen && task->conn->datadgst_en)
2116                         pdulen += ISCSI_DIGEST_SIZE;
2117
2118                 task->conn->txdata_octets += pdulen;
2119                 return 0;
2120         }
2121
2122         if (err == -EAGAIN || err == -ENOBUFS) {
2123                 log_debug(1 << CXGBI_DBG_PDU_TX,
2124                         "task 0x%p, skb 0x%p, len %u/%u, %d EAGAIN.\n",
2125                         task, skb, skb->len, skb->data_len, err);
2126                 /* reset skb to send when we are called again */
2127                 tdata->skb = skb;
2128                 return err;
2129         }
2130
2131         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_PDU_TX,
2132                 "itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
2133                 task->itt, skb, skb->len, skb->data_len, err);
2134
2135         __kfree_skb(skb);
2136
2137         iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
2138         iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
2139         return err;
2140 }
2141 EXPORT_SYMBOL_GPL(cxgbi_conn_xmit_pdu);
2142
2143 void cxgbi_cleanup_task(struct iscsi_task *task)
2144 {
2145         struct iscsi_tcp_task *tcp_task = task->dd_data;
2146         struct cxgbi_task_data *tdata = iscsi_task_cxgbi_data(task);
2147
2148         if (!tcp_task || !tdata || (tcp_task->dd_data != tdata)) {
2149                 pr_info("task 0x%p,0x%p, tcp_task 0x%p, tdata 0x%p/0x%p.\n",
2150                         task, task->sc, tcp_task,
2151                         tcp_task ? tcp_task->dd_data : NULL, tdata);
2152                 return;
2153         }
2154
2155         log_debug(1 << CXGBI_DBG_ISCSI,
2156                 "task 0x%p, skb 0x%p, itt 0x%x.\n",
2157                 task, tdata->skb, task->hdr_itt);
2158
2159         tcp_task->dd_data = NULL;
2160
2161         if (!task->sc)
2162                 kfree(task->hdr);
2163         task->hdr = NULL;
2164
2165         /*  never reached the xmit task callout */
2166         if (tdata->skb) {
2167                 __kfree_skb(tdata->skb);
2168                 tdata->skb = NULL;
2169         }
2170
2171         task_release_itt(task, task->hdr_itt);
2172         memset(tdata, 0, sizeof(*tdata));
2173
2174         iscsi_tcp_cleanup_task(task);
2175 }
2176 EXPORT_SYMBOL_GPL(cxgbi_cleanup_task);
2177
2178 void cxgbi_get_conn_stats(struct iscsi_cls_conn *cls_conn,
2179                                 struct iscsi_stats *stats)
2180 {
2181         struct iscsi_conn *conn = cls_conn->dd_data;
2182
2183         stats->txdata_octets = conn->txdata_octets;
2184         stats->rxdata_octets = conn->rxdata_octets;
2185         stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
2186         stats->dataout_pdus = conn->dataout_pdus_cnt;
2187         stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
2188         stats->datain_pdus = conn->datain_pdus_cnt;
2189         stats->r2t_pdus = conn->r2t_pdus_cnt;
2190         stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
2191         stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
2192         stats->digest_err = 0;
2193         stats->timeout_err = 0;
2194         stats->custom_length = 1;
2195         strcpy(stats->custom[0].desc, "eh_abort_cnt");
2196         stats->custom[0].value = conn->eh_abort_cnt;
2197 }
2198 EXPORT_SYMBOL_GPL(cxgbi_get_conn_stats);
2199
2200 static int cxgbi_conn_max_xmit_dlength(struct iscsi_conn *conn)
2201 {
2202         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2203         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2204         struct cxgbi_device *cdev = cconn->chba->cdev;
2205         unsigned int headroom = SKB_MAX_HEAD(cdev->skb_tx_rsvd);
2206         unsigned int max_def = 512 * MAX_SKB_FRAGS;
2207         unsigned int max = max(max_def, headroom);
2208
2209         max = min(cconn->chba->cdev->tx_max_size, max);
2210         if (conn->max_xmit_dlength)
2211                 conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
2212         else
2213                 conn->max_xmit_dlength = max;
2214         cxgbi_align_pdu_size(conn->max_xmit_dlength);
2215
2216         return 0;
2217 }
2218
2219 static int cxgbi_conn_max_recv_dlength(struct iscsi_conn *conn)
2220 {
2221         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2222         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2223         unsigned int max = cconn->chba->cdev->rx_max_size;
2224
2225         cxgbi_align_pdu_size(max);
2226
2227         if (conn->max_recv_dlength) {
2228                 if (conn->max_recv_dlength > max) {
2229                         pr_err("MaxRecvDataSegmentLength %u > %u.\n",
2230                                 conn->max_recv_dlength, max);
2231                         return -EINVAL;
2232                 }
2233                 conn->max_recv_dlength = min(conn->max_recv_dlength, max);
2234                 cxgbi_align_pdu_size(conn->max_recv_dlength);
2235         } else
2236                 conn->max_recv_dlength = max;
2237
2238         return 0;
2239 }
2240
2241 int cxgbi_set_conn_param(struct iscsi_cls_conn *cls_conn,
2242                         enum iscsi_param param, char *buf, int buflen)
2243 {
2244         struct iscsi_conn *conn = cls_conn->dd_data;
2245         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2246         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2247         struct cxgbi_sock *csk = cconn->cep->csk;
2248         int err;
2249
2250         log_debug(1 << CXGBI_DBG_ISCSI,
2251                 "cls_conn 0x%p, param %d, buf(%d) %s.\n",
2252                 cls_conn, param, buflen, buf);
2253
2254         switch (param) {
2255         case ISCSI_PARAM_HDRDGST_EN:
2256                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2257                 if (!err && conn->hdrdgst_en)
2258                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2259                                                         conn->hdrdgst_en,
2260                                                         conn->datadgst_en);
2261                 break;
2262         case ISCSI_PARAM_DATADGST_EN:
2263                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2264                 if (!err && conn->datadgst_en)
2265                         err = csk->cdev->csk_ddp_setup_digest(csk, csk->tid,
2266                                                         conn->hdrdgst_en,
2267                                                         conn->datadgst_en);
2268                 break;
2269         case ISCSI_PARAM_MAX_R2T:
2270                 return iscsi_tcp_set_max_r2t(conn, buf);
2271         case ISCSI_PARAM_MAX_RECV_DLENGTH:
2272                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2273                 if (!err)
2274                         err = cxgbi_conn_max_recv_dlength(conn);
2275                 break;
2276         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2277                 err = iscsi_set_param(cls_conn, param, buf, buflen);
2278                 if (!err)
2279                         err = cxgbi_conn_max_xmit_dlength(conn);
2280                 break;
2281         default:
2282                 return iscsi_set_param(cls_conn, param, buf, buflen);
2283         }
2284         return err;
2285 }
2286 EXPORT_SYMBOL_GPL(cxgbi_set_conn_param);
2287
2288 int cxgbi_get_ep_param(struct iscsi_endpoint *ep, enum iscsi_param param,
2289                        char *buf)
2290 {
2291         struct cxgbi_endpoint *cep = ep->dd_data;
2292         struct cxgbi_sock *csk;
2293
2294         log_debug(1 << CXGBI_DBG_ISCSI,
2295                 "cls_conn 0x%p, param %d.\n", ep, param);
2296
2297         switch (param) {
2298         case ISCSI_PARAM_CONN_PORT:
2299         case ISCSI_PARAM_CONN_ADDRESS:
2300                 if (!cep)
2301                         return -ENOTCONN;
2302
2303                 csk = cep->csk;
2304                 if (!csk)
2305                         return -ENOTCONN;
2306
2307                 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
2308                                                  &csk->daddr, param, buf);
2309         default:
2310                 break;
2311         }
2312         return -ENOSYS;
2313 }
2314 EXPORT_SYMBOL_GPL(cxgbi_get_ep_param);
2315
2316 struct iscsi_cls_conn *
2317 cxgbi_create_conn(struct iscsi_cls_session *cls_session, u32 cid)
2318 {
2319         struct iscsi_cls_conn *cls_conn;
2320         struct iscsi_conn *conn;
2321         struct iscsi_tcp_conn *tcp_conn;
2322         struct cxgbi_conn *cconn;
2323
2324         cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
2325         if (!cls_conn)
2326                 return NULL;
2327
2328         conn = cls_conn->dd_data;
2329         tcp_conn = conn->dd_data;
2330         cconn = tcp_conn->dd_data;
2331         cconn->iconn = conn;
2332
2333         log_debug(1 << CXGBI_DBG_ISCSI,
2334                 "cid %u(0x%x), cls 0x%p,0x%p, conn 0x%p,0x%p,0x%p.\n",
2335                 cid, cid, cls_session, cls_conn, conn, tcp_conn, cconn);
2336
2337         return cls_conn;
2338 }
2339 EXPORT_SYMBOL_GPL(cxgbi_create_conn);
2340
2341 int cxgbi_bind_conn(struct iscsi_cls_session *cls_session,
2342                                 struct iscsi_cls_conn *cls_conn,
2343                                 u64 transport_eph, int is_leading)
2344 {
2345         struct iscsi_conn *conn = cls_conn->dd_data;
2346         struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
2347         struct cxgbi_conn *cconn = tcp_conn->dd_data;
2348         struct cxgbi_ppm *ppm;
2349         struct iscsi_endpoint *ep;
2350         struct cxgbi_endpoint *cep;
2351         struct cxgbi_sock *csk;
2352         int err;
2353
2354         ep = iscsi_lookup_endpoint(transport_eph);
2355         if (!ep)
2356                 return -EINVAL;
2357
2358         /*  setup ddp pagesize */
2359         cep = ep->dd_data;
2360         csk = cep->csk;
2361
2362         ppm = csk->cdev->cdev2ppm(csk->cdev);
2363         err = csk->cdev->csk_ddp_setup_pgidx(csk, csk->tid,
2364                                              ppm->tformat.pgsz_idx_dflt);
2365         if (err < 0)
2366                 return err;
2367
2368         err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
2369         if (err)
2370                 return -EINVAL;
2371
2372         /*  calculate the tag idx bits needed for this conn based on cmds_max */
2373         cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
2374
2375         write_lock_bh(&csk->callback_lock);
2376         csk->user_data = conn;
2377         cconn->chba = cep->chba;
2378         cconn->cep = cep;
2379         cep->cconn = cconn;
2380         write_unlock_bh(&csk->callback_lock);
2381
2382         cxgbi_conn_max_xmit_dlength(conn);
2383         cxgbi_conn_max_recv_dlength(conn);
2384
2385         log_debug(1 << CXGBI_DBG_ISCSI,
2386                 "cls 0x%p,0x%p, ep 0x%p, cconn 0x%p, csk 0x%p.\n",
2387                 cls_session, cls_conn, ep, cconn, csk);
2388         /*  init recv engine */
2389         iscsi_tcp_hdr_recv_prep(tcp_conn);
2390
2391         return 0;
2392 }
2393 EXPORT_SYMBOL_GPL(cxgbi_bind_conn);
2394
2395 struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *ep,
2396                                                 u16 cmds_max, u16 qdepth,
2397                                                 u32 initial_cmdsn)
2398 {
2399         struct cxgbi_endpoint *cep;
2400         struct cxgbi_hba *chba;
2401         struct Scsi_Host *shost;
2402         struct iscsi_cls_session *cls_session;
2403         struct iscsi_session *session;
2404
2405         if (!ep) {
2406                 pr_err("missing endpoint.\n");
2407                 return NULL;
2408         }
2409
2410         cep = ep->dd_data;
2411         chba = cep->chba;
2412         shost = chba->shost;
2413
2414         BUG_ON(chba != iscsi_host_priv(shost));
2415
2416         cls_session = iscsi_session_setup(chba->cdev->itp, shost,
2417                                         cmds_max, 0,
2418                                         sizeof(struct iscsi_tcp_task) +
2419                                         sizeof(struct cxgbi_task_data),
2420                                         initial_cmdsn, ISCSI_MAX_TARGET);
2421         if (!cls_session)
2422                 return NULL;
2423
2424         session = cls_session->dd_data;
2425         if (iscsi_tcp_r2tpool_alloc(session))
2426                 goto remove_session;
2427
2428         log_debug(1 << CXGBI_DBG_ISCSI,
2429                 "ep 0x%p, cls sess 0x%p.\n", ep, cls_session);
2430         return cls_session;
2431
2432 remove_session:
2433         iscsi_session_teardown(cls_session);
2434         return NULL;
2435 }
2436 EXPORT_SYMBOL_GPL(cxgbi_create_session);
2437
2438 void cxgbi_destroy_session(struct iscsi_cls_session *cls_session)
2439 {
2440         log_debug(1 << CXGBI_DBG_ISCSI,
2441                 "cls sess 0x%p.\n", cls_session);
2442
2443         iscsi_tcp_r2tpool_free(cls_session->dd_data);
2444         iscsi_session_teardown(cls_session);
2445 }
2446 EXPORT_SYMBOL_GPL(cxgbi_destroy_session);
2447
2448 int cxgbi_set_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2449                         char *buf, int buflen)
2450 {
2451         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2452
2453         if (!chba->ndev) {
2454                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2455                                 "netdev for host not set.\n");
2456                 return -ENODEV;
2457         }
2458
2459         log_debug(1 << CXGBI_DBG_ISCSI,
2460                 "shost 0x%p, hba 0x%p,%s, param %d, buf(%d) %s.\n",
2461                 shost, chba, chba->ndev->name, param, buflen, buf);
2462
2463         switch (param) {
2464         case ISCSI_HOST_PARAM_IPADDRESS:
2465         {
2466                 __be32 addr = in_aton(buf);
2467                 log_debug(1 << CXGBI_DBG_ISCSI,
2468                         "hba %s, req. ipv4 %pI4.\n", chba->ndev->name, &addr);
2469                 cxgbi_set_iscsi_ipv4(chba, addr);
2470                 return 0;
2471         }
2472         case ISCSI_HOST_PARAM_HWADDRESS:
2473         case ISCSI_HOST_PARAM_NETDEV_NAME:
2474                 return 0;
2475         default:
2476                 return iscsi_host_set_param(shost, param, buf, buflen);
2477         }
2478 }
2479 EXPORT_SYMBOL_GPL(cxgbi_set_host_param);
2480
2481 int cxgbi_get_host_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2482                         char *buf)
2483 {
2484         struct cxgbi_hba *chba = iscsi_host_priv(shost);
2485         int len = 0;
2486
2487         if (!chba->ndev) {
2488                 shost_printk(KERN_ERR, shost, "Could not get host param. "
2489                                 "netdev for host not set.\n");
2490                 return -ENODEV;
2491         }
2492
2493         log_debug(1 << CXGBI_DBG_ISCSI,
2494                 "shost 0x%p, hba 0x%p,%s, param %d.\n",
2495                 shost, chba, chba->ndev->name, param);
2496
2497         switch (param) {
2498         case ISCSI_HOST_PARAM_HWADDRESS:
2499                 len = sysfs_format_mac(buf, chba->ndev->dev_addr, 6);
2500                 break;
2501         case ISCSI_HOST_PARAM_NETDEV_NAME:
2502                 len = sprintf(buf, "%s\n", chba->ndev->name);
2503                 break;
2504         case ISCSI_HOST_PARAM_IPADDRESS:
2505         {
2506                 struct cxgbi_sock *csk = find_sock_on_port(chba->cdev,
2507                                                            chba->port_id);
2508                 if (csk) {
2509                         len = sprintf(buf, "%pIS",
2510                                       (struct sockaddr *)&csk->saddr);
2511                 }
2512                 log_debug(1 << CXGBI_DBG_ISCSI,
2513                           "hba %s, addr %s.\n", chba->ndev->name, buf);
2514                 break;
2515         }
2516         default:
2517                 return iscsi_host_get_param(shost, param, buf);
2518         }
2519
2520         return len;
2521 }
2522 EXPORT_SYMBOL_GPL(cxgbi_get_host_param);
2523
2524 struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *shost,
2525                                         struct sockaddr *dst_addr,
2526                                         int non_blocking)
2527 {
2528         struct iscsi_endpoint *ep;
2529         struct cxgbi_endpoint *cep;
2530         struct cxgbi_hba *hba = NULL;
2531         struct cxgbi_sock *csk;
2532         int ifindex = 0;
2533         int err = -EINVAL;
2534
2535         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2536                 "shost 0x%p, non_blocking %d, dst_addr 0x%p.\n",
2537                 shost, non_blocking, dst_addr);
2538
2539         if (shost) {
2540                 hba = iscsi_host_priv(shost);
2541                 if (!hba) {
2542                         pr_info("shost 0x%p, priv NULL.\n", shost);
2543                         goto err_out;
2544                 }
2545         }
2546
2547 check_route:
2548         if (dst_addr->sa_family == AF_INET) {
2549                 csk = cxgbi_check_route(dst_addr, ifindex);
2550 #if IS_ENABLED(CONFIG_IPV6)
2551         } else if (dst_addr->sa_family == AF_INET6) {
2552                 csk = cxgbi_check_route6(dst_addr, ifindex);
2553 #endif
2554         } else {
2555                 pr_info("address family 0x%x NOT supported.\n",
2556                         dst_addr->sa_family);
2557                 err = -EAFNOSUPPORT;
2558                 return (struct iscsi_endpoint *)ERR_PTR(err);
2559         }
2560
2561         if (IS_ERR(csk))
2562                 return (struct iscsi_endpoint *)csk;
2563         cxgbi_sock_get(csk);
2564
2565         if (!hba)
2566                 hba = csk->cdev->hbas[csk->port_id];
2567         else if (hba != csk->cdev->hbas[csk->port_id]) {
2568                 if (ifindex != hba->ndev->ifindex) {
2569                         cxgbi_sock_put(csk);
2570                         cxgbi_sock_closed(csk);
2571                         ifindex = hba->ndev->ifindex;
2572                         goto check_route;
2573                 }
2574
2575                 pr_info("Could not connect through requested host %u"
2576                         "hba 0x%p != 0x%p (%u).\n",
2577                         shost->host_no, hba,
2578                         csk->cdev->hbas[csk->port_id], csk->port_id);
2579                 err = -ENOSPC;
2580                 goto release_conn;
2581         }
2582
2583         err = sock_get_port(csk);
2584         if (err)
2585                 goto release_conn;
2586
2587         cxgbi_sock_set_state(csk, CTP_CONNECTING);
2588         err = csk->cdev->csk_init_act_open(csk);
2589         if (err)
2590                 goto release_conn;
2591
2592         if (cxgbi_sock_is_closing(csk)) {
2593                 err = -ENOSPC;
2594                 pr_info("csk 0x%p is closing.\n", csk);
2595                 goto release_conn;
2596         }
2597
2598         ep = iscsi_create_endpoint(sizeof(*cep));
2599         if (!ep) {
2600                 err = -ENOMEM;
2601                 pr_info("iscsi alloc ep, OOM.\n");
2602                 goto release_conn;
2603         }
2604
2605         cep = ep->dd_data;
2606         cep->csk = csk;
2607         cep->chba = hba;
2608
2609         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2610                 "ep 0x%p, cep 0x%p, csk 0x%p, hba 0x%p,%s.\n",
2611                 ep, cep, csk, hba, hba->ndev->name);
2612         return ep;
2613
2614 release_conn:
2615         cxgbi_sock_put(csk);
2616         cxgbi_sock_closed(csk);
2617 err_out:
2618         return ERR_PTR(err);
2619 }
2620 EXPORT_SYMBOL_GPL(cxgbi_ep_connect);
2621
2622 int cxgbi_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
2623 {
2624         struct cxgbi_endpoint *cep = ep->dd_data;
2625         struct cxgbi_sock *csk = cep->csk;
2626
2627         if (!cxgbi_sock_is_established(csk))
2628                 return 0;
2629         return 1;
2630 }
2631 EXPORT_SYMBOL_GPL(cxgbi_ep_poll);
2632
2633 void cxgbi_ep_disconnect(struct iscsi_endpoint *ep)
2634 {
2635         struct cxgbi_endpoint *cep = ep->dd_data;
2636         struct cxgbi_conn *cconn = cep->cconn;
2637         struct cxgbi_sock *csk = cep->csk;
2638
2639         log_debug(1 << CXGBI_DBG_ISCSI | 1 << CXGBI_DBG_SOCK,
2640                 "ep 0x%p, cep 0x%p, cconn 0x%p, csk 0x%p,%u,0x%lx.\n",
2641                 ep, cep, cconn, csk, csk->state, csk->flags);
2642
2643         if (cconn && cconn->iconn) {
2644                 iscsi_suspend_tx(cconn->iconn);
2645                 write_lock_bh(&csk->callback_lock);
2646                 cep->csk->user_data = NULL;
2647                 cconn->cep = NULL;
2648                 write_unlock_bh(&csk->callback_lock);
2649         }
2650         iscsi_destroy_endpoint(ep);
2651
2652         if (likely(csk->state >= CTP_ESTABLISHED))
2653                 need_active_close(csk);
2654         else
2655                 cxgbi_sock_closed(csk);
2656
2657         cxgbi_sock_put(csk);
2658 }
2659 EXPORT_SYMBOL_GPL(cxgbi_ep_disconnect);
2660
2661 int cxgbi_iscsi_init(struct iscsi_transport *itp,
2662                         struct scsi_transport_template **stt)
2663 {
2664         *stt = iscsi_register_transport(itp);
2665         if (*stt == NULL) {
2666                 pr_err("unable to register %s transport 0x%p.\n",
2667                         itp->name, itp);
2668                 return -ENODEV;
2669         }
2670         log_debug(1 << CXGBI_DBG_ISCSI,
2671                 "%s, registered iscsi transport 0x%p.\n",
2672                 itp->name, stt);
2673         return 0;
2674 }
2675 EXPORT_SYMBOL_GPL(cxgbi_iscsi_init);
2676
2677 void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
2678                         struct scsi_transport_template **stt)
2679 {
2680         if (*stt) {
2681                 log_debug(1 << CXGBI_DBG_ISCSI,
2682                         "de-register transport 0x%p, %s, stt 0x%p.\n",
2683                         itp, itp->name, *stt);
2684                 *stt = NULL;
2685                 iscsi_unregister_transport(itp);
2686         }
2687 }
2688 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
2689
2690 umode_t cxgbi_attr_is_visible(int param_type, int param)
2691 {
2692         switch (param_type) {
2693         case ISCSI_HOST_PARAM:
2694                 switch (param) {
2695                 case ISCSI_HOST_PARAM_NETDEV_NAME:
2696                 case ISCSI_HOST_PARAM_HWADDRESS:
2697                 case ISCSI_HOST_PARAM_IPADDRESS:
2698                 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2699                         return S_IRUGO;
2700                 default:
2701                         return 0;
2702                 }
2703         case ISCSI_PARAM:
2704                 switch (param) {
2705                 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2706                 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2707                 case ISCSI_PARAM_HDRDGST_EN:
2708                 case ISCSI_PARAM_DATADGST_EN:
2709                 case ISCSI_PARAM_CONN_ADDRESS:
2710                 case ISCSI_PARAM_CONN_PORT:
2711                 case ISCSI_PARAM_EXP_STATSN:
2712                 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2713                 case ISCSI_PARAM_PERSISTENT_PORT:
2714                 case ISCSI_PARAM_PING_TMO:
2715                 case ISCSI_PARAM_RECV_TMO:
2716                 case ISCSI_PARAM_INITIAL_R2T_EN:
2717                 case ISCSI_PARAM_MAX_R2T:
2718                 case ISCSI_PARAM_IMM_DATA_EN:
2719                 case ISCSI_PARAM_FIRST_BURST:
2720                 case ISCSI_PARAM_MAX_BURST:
2721                 case ISCSI_PARAM_PDU_INORDER_EN:
2722                 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2723                 case ISCSI_PARAM_ERL:
2724                 case ISCSI_PARAM_TARGET_NAME:
2725                 case ISCSI_PARAM_TPGT:
2726                 case ISCSI_PARAM_USERNAME:
2727                 case ISCSI_PARAM_PASSWORD:
2728                 case ISCSI_PARAM_USERNAME_IN:
2729                 case ISCSI_PARAM_PASSWORD_IN:
2730                 case ISCSI_PARAM_FAST_ABORT:
2731                 case ISCSI_PARAM_ABORT_TMO:
2732                 case ISCSI_PARAM_LU_RESET_TMO:
2733                 case ISCSI_PARAM_TGT_RESET_TMO:
2734                 case ISCSI_PARAM_IFACE_NAME:
2735                 case ISCSI_PARAM_INITIATOR_NAME:
2736                         return S_IRUGO;
2737                 default:
2738                         return 0;
2739                 }
2740         }
2741
2742         return 0;
2743 }
2744 EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
2745
2746 static int __init libcxgbi_init_module(void)
2747 {
2748         pr_info("%s", version);
2749
2750         BUILD_BUG_ON(sizeof_field(struct sk_buff, cb) <
2751                      sizeof(struct cxgbi_skb_cb));
2752         return 0;
2753 }
2754
2755 static void __exit libcxgbi_exit_module(void)
2756 {
2757         cxgbi_device_unregister_all(0xFF);
2758         return;
2759 }
2760
2761 module_init(libcxgbi_init_module);
2762 module_exit(libcxgbi_exit_module);