2 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved.
3 * Copyright (c) 2004 Topspin Corporation. All rights reserved.
4 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved.
5 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
36 #include <linux/completion.h>
37 #include <linux/dma-mapping.h>
38 #include <linux/device.h>
39 #include <linux/module.h>
40 #include <linux/err.h>
41 #include <linux/idr.h>
42 #include <linux/interrupt.h>
43 #include <linux/random.h>
44 #include <linux/rbtree.h>
45 #include <linux/spinlock.h>
46 #include <linux/slab.h>
47 #include <linux/sysfs.h>
48 #include <linux/workqueue.h>
49 #include <linux/kdev_t.h>
50 #include <linux/etherdevice.h>
52 #include <rdma/ib_cache.h>
53 #include <rdma/ib_cm.h>
56 MODULE_AUTHOR("Sean Hefty");
57 MODULE_DESCRIPTION("InfiniBand CM");
58 MODULE_LICENSE("Dual BSD/GPL");
60 static const char * const ibcm_rej_reason_strs[] = {
61 [IB_CM_REJ_NO_QP] = "no QP",
62 [IB_CM_REJ_NO_EEC] = "no EEC",
63 [IB_CM_REJ_NO_RESOURCES] = "no resources",
64 [IB_CM_REJ_TIMEOUT] = "timeout",
65 [IB_CM_REJ_UNSUPPORTED] = "unsupported",
66 [IB_CM_REJ_INVALID_COMM_ID] = "invalid comm ID",
67 [IB_CM_REJ_INVALID_COMM_INSTANCE] = "invalid comm instance",
68 [IB_CM_REJ_INVALID_SERVICE_ID] = "invalid service ID",
69 [IB_CM_REJ_INVALID_TRANSPORT_TYPE] = "invalid transport type",
70 [IB_CM_REJ_STALE_CONN] = "stale conn",
71 [IB_CM_REJ_RDC_NOT_EXIST] = "RDC not exist",
72 [IB_CM_REJ_INVALID_GID] = "invalid GID",
73 [IB_CM_REJ_INVALID_LID] = "invalid LID",
74 [IB_CM_REJ_INVALID_SL] = "invalid SL",
75 [IB_CM_REJ_INVALID_TRAFFIC_CLASS] = "invalid traffic class",
76 [IB_CM_REJ_INVALID_HOP_LIMIT] = "invalid hop limit",
77 [IB_CM_REJ_INVALID_PACKET_RATE] = "invalid packet rate",
78 [IB_CM_REJ_INVALID_ALT_GID] = "invalid alt GID",
79 [IB_CM_REJ_INVALID_ALT_LID] = "invalid alt LID",
80 [IB_CM_REJ_INVALID_ALT_SL] = "invalid alt SL",
81 [IB_CM_REJ_INVALID_ALT_TRAFFIC_CLASS] = "invalid alt traffic class",
82 [IB_CM_REJ_INVALID_ALT_HOP_LIMIT] = "invalid alt hop limit",
83 [IB_CM_REJ_INVALID_ALT_PACKET_RATE] = "invalid alt packet rate",
84 [IB_CM_REJ_PORT_CM_REDIRECT] = "port CM redirect",
85 [IB_CM_REJ_PORT_REDIRECT] = "port redirect",
86 [IB_CM_REJ_INVALID_MTU] = "invalid MTU",
87 [IB_CM_REJ_INSUFFICIENT_RESP_RESOURCES] = "insufficient resp resources",
88 [IB_CM_REJ_CONSUMER_DEFINED] = "consumer defined",
89 [IB_CM_REJ_INVALID_RNR_RETRY] = "invalid RNR retry",
90 [IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID] = "duplicate local comm ID",
91 [IB_CM_REJ_INVALID_CLASS_VERSION] = "invalid class version",
92 [IB_CM_REJ_INVALID_FLOW_LABEL] = "invalid flow label",
93 [IB_CM_REJ_INVALID_ALT_FLOW_LABEL] = "invalid alt flow label",
96 const char *__attribute_const__ ibcm_reject_msg(int reason)
98 size_t index = reason;
100 if (index < ARRAY_SIZE(ibcm_rej_reason_strs) &&
101 ibcm_rej_reason_strs[index])
102 return ibcm_rej_reason_strs[index];
104 return "unrecognized reason";
106 EXPORT_SYMBOL(ibcm_reject_msg);
108 static void cm_add_one(struct ib_device *device);
109 static void cm_remove_one(struct ib_device *device, void *client_data);
111 static struct ib_client cm_client = {
114 .remove = cm_remove_one
117 static struct ib_cm {
119 struct list_head device_list;
120 rwlock_t device_lock;
121 struct rb_root listen_service_table;
122 u64 listen_service_id;
123 /* struct rb_root peer_service_table; todo: fix peer to peer */
124 struct rb_root remote_qp_table;
125 struct rb_root remote_id_table;
126 struct rb_root remote_sidr_table;
127 struct idr local_id_table;
128 __be32 random_id_operand;
129 struct list_head timewait_list;
130 struct workqueue_struct *wq;
131 /* Sync on cm change port state */
132 spinlock_t state_lock;
135 /* Counter indexes ordered by attribute ID */
149 CM_ATTR_ID_OFFSET = 0x0010,
160 static char const counter_group_names[CM_COUNTER_GROUPS]
161 [sizeof("cm_rx_duplicates")] = {
162 "cm_tx_msgs", "cm_tx_retries",
163 "cm_rx_msgs", "cm_rx_duplicates"
166 struct cm_counter_group {
168 atomic_long_t counter[CM_ATTR_COUNT];
171 struct cm_counter_attribute {
172 struct attribute attr;
176 #define CM_COUNTER_ATTR(_name, _index) \
177 struct cm_counter_attribute cm_##_name##_counter_attr = { \
178 .attr = { .name = __stringify(_name), .mode = 0444 }, \
182 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
183 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
184 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
185 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
186 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
187 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
188 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
189 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
190 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
191 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
192 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
194 static struct attribute *cm_counter_default_attrs[] = {
195 &cm_req_counter_attr.attr,
196 &cm_mra_counter_attr.attr,
197 &cm_rej_counter_attr.attr,
198 &cm_rep_counter_attr.attr,
199 &cm_rtu_counter_attr.attr,
200 &cm_dreq_counter_attr.attr,
201 &cm_drep_counter_attr.attr,
202 &cm_sidr_req_counter_attr.attr,
203 &cm_sidr_rep_counter_attr.attr,
204 &cm_lap_counter_attr.attr,
205 &cm_apr_counter_attr.attr,
210 struct cm_device *cm_dev;
211 struct ib_mad_agent *mad_agent;
212 struct kobject port_obj;
214 struct list_head cm_priv_prim_list;
215 struct list_head cm_priv_altr_list;
216 struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
220 struct list_head list;
221 struct ib_device *ib_device;
222 struct device *device;
225 struct cm_port *port[0];
229 struct cm_port *port;
231 struct rdma_ah_attr ah_attr;
237 struct delayed_work work;
238 struct list_head list;
239 struct cm_port *port;
240 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
241 __be32 local_id; /* Established / timewait */
243 struct ib_cm_event cm_event;
244 struct sa_path_rec path[0];
247 struct cm_timewait_info {
248 struct cm_work work; /* Must be first. */
249 struct list_head list;
250 struct rb_node remote_qp_node;
251 struct rb_node remote_id_node;
252 __be64 remote_ca_guid;
254 u8 inserted_remote_qp;
255 u8 inserted_remote_id;
258 struct cm_id_private {
261 struct rb_node service_node;
262 struct rb_node sidr_id_node;
263 spinlock_t lock; /* Do not acquire inside cm.lock */
264 struct completion comp;
266 /* Number of clients sharing this ib_cm_id. Only valid for listeners.
267 * Protected by the cm.lock spinlock. */
268 int listen_sharecount;
270 struct ib_mad_send_buf *msg;
271 struct cm_timewait_info *timewait_info;
272 /* todo: use alternate port on send failure */
280 enum ib_qp_type qp_type;
284 enum ib_mtu path_mtu;
289 u8 responder_resources;
296 struct list_head prim_list;
297 struct list_head altr_list;
298 /* Indicates that the send port mad is registered and av is set */
299 int prim_send_port_not_ready;
300 int altr_send_port_not_ready;
302 struct list_head work_list;
306 static void cm_work_handler(struct work_struct *work);
308 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
310 if (atomic_dec_and_test(&cm_id_priv->refcount))
311 complete(&cm_id_priv->comp);
314 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
315 struct ib_mad_send_buf **msg)
317 struct ib_mad_agent *mad_agent;
318 struct ib_mad_send_buf *m;
321 unsigned long flags, flags2;
324 /* don't let the port to be released till the agent is down */
325 spin_lock_irqsave(&cm.state_lock, flags2);
326 spin_lock_irqsave(&cm.lock, flags);
327 if (!cm_id_priv->prim_send_port_not_ready)
328 av = &cm_id_priv->av;
329 else if (!cm_id_priv->altr_send_port_not_ready &&
330 (cm_id_priv->alt_av.port))
331 av = &cm_id_priv->alt_av;
333 pr_info("%s: not valid CM id\n", __func__);
335 spin_unlock_irqrestore(&cm.lock, flags);
338 spin_unlock_irqrestore(&cm.lock, flags);
339 /* Make sure the port haven't released the mad yet */
340 mad_agent = cm_id_priv->av.port->mad_agent;
342 pr_info("%s: not a valid MAD agent\n", __func__);
346 ah = rdma_create_ah(mad_agent->qp->pd, &av->ah_attr);
352 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
354 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
356 IB_MGMT_BASE_VERSION);
363 /* Timeout set by caller if response is expected. */
365 m->retries = cm_id_priv->max_cm_retries;
367 atomic_inc(&cm_id_priv->refcount);
368 m->context[0] = cm_id_priv;
372 spin_unlock_irqrestore(&cm.state_lock, flags2);
376 static struct ib_mad_send_buf *cm_alloc_response_msg_no_ah(struct cm_port *port,
377 struct ib_mad_recv_wc *mad_recv_wc)
379 return ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
380 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
382 IB_MGMT_BASE_VERSION);
385 static int cm_create_response_msg_ah(struct cm_port *port,
386 struct ib_mad_recv_wc *mad_recv_wc,
387 struct ib_mad_send_buf *msg)
391 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
392 mad_recv_wc->recv_buf.grh, port->port_num);
400 static void cm_free_msg(struct ib_mad_send_buf *msg)
403 rdma_destroy_ah(msg->ah);
405 cm_deref_id(msg->context[0]);
406 ib_free_send_mad(msg);
409 static int cm_alloc_response_msg(struct cm_port *port,
410 struct ib_mad_recv_wc *mad_recv_wc,
411 struct ib_mad_send_buf **msg)
413 struct ib_mad_send_buf *m;
416 m = cm_alloc_response_msg_no_ah(port, mad_recv_wc);
420 ret = cm_create_response_msg_ah(port, mad_recv_wc, m);
430 static void * cm_copy_private_data(const void *private_data,
435 if (!private_data || !private_data_len)
438 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
440 return ERR_PTR(-ENOMEM);
445 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
446 void *private_data, u8 private_data_len)
448 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
449 kfree(cm_id_priv->private_data);
451 cm_id_priv->private_data = private_data;
452 cm_id_priv->private_data_len = private_data_len;
455 static int cm_init_av_for_lap(struct cm_port *port, struct ib_wc *wc,
456 struct ib_grh *grh, struct cm_av *av)
458 struct rdma_ah_attr new_ah_attr;
462 av->pkey_index = wc->pkey_index;
465 * av->ah_attr might be initialized based on past wc during incoming
466 * connect request or while sending out connect request. So initialize
467 * a new ah_attr on stack. If initialization fails, old ah_attr is
468 * used for sending any responses. If initialization is successful,
469 * than new ah_attr is used by overwriting old one.
471 ret = ib_init_ah_attr_from_wc(port->cm_dev->ib_device,
477 rdma_move_ah_attr(&av->ah_attr, &new_ah_attr);
481 static int cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
482 struct ib_grh *grh, struct cm_av *av)
485 av->pkey_index = wc->pkey_index;
486 return ib_init_ah_attr_from_wc(port->cm_dev->ib_device,
491 static int add_cm_id_to_port_list(struct cm_id_private *cm_id_priv,
493 struct cm_port *port)
498 spin_lock_irqsave(&cm.lock, flags);
500 if (&cm_id_priv->av == av)
501 list_add_tail(&cm_id_priv->prim_list, &port->cm_priv_prim_list);
502 else if (&cm_id_priv->alt_av == av)
503 list_add_tail(&cm_id_priv->altr_list, &port->cm_priv_altr_list);
507 spin_unlock_irqrestore(&cm.lock, flags);
511 static struct cm_port *
512 get_cm_port_from_path(struct sa_path_rec *path, const struct ib_gid_attr *attr)
514 struct cm_device *cm_dev;
515 struct cm_port *port = NULL;
519 read_lock_irqsave(&cm.device_lock, flags);
520 list_for_each_entry(cm_dev, &cm.device_list, list) {
521 if (cm_dev->ib_device == attr->device) {
522 port = cm_dev->port[attr->port_num - 1];
526 read_unlock_irqrestore(&cm.device_lock, flags);
528 /* SGID attribute can be NULL in following
530 * (a) Alternative path
531 * (b) IB link layer without GRH
532 * (c) LAP send messages
534 read_lock_irqsave(&cm.device_lock, flags);
535 list_for_each_entry(cm_dev, &cm.device_list, list) {
536 attr = rdma_find_gid(cm_dev->ib_device,
538 sa_conv_pathrec_to_gid_type(path),
541 port = cm_dev->port[attr->port_num - 1];
545 read_unlock_irqrestore(&cm.device_lock, flags);
547 rdma_put_gid_attr(attr);
552 static int cm_init_av_by_path(struct sa_path_rec *path,
553 const struct ib_gid_attr *sgid_attr,
555 struct cm_id_private *cm_id_priv)
557 struct rdma_ah_attr new_ah_attr;
558 struct cm_device *cm_dev;
559 struct cm_port *port;
562 port = get_cm_port_from_path(path, sgid_attr);
565 cm_dev = port->cm_dev;
567 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
568 be16_to_cpu(path->pkey), &av->pkey_index);
575 * av->ah_attr might be initialized based on wc or during
576 * request processing time which might have reference to sgid_attr.
577 * So initialize a new ah_attr on stack.
578 * If initialization fails, old ah_attr is used for sending any
579 * responses. If initialization is successful, than new ah_attr
580 * is used by overwriting the old one. So that right ah_attr
581 * can be used to return an error response.
583 ret = ib_init_ah_attr_from_path(cm_dev->ib_device, port->port_num, path,
584 &new_ah_attr, sgid_attr);
588 av->timeout = path->packet_life_time + 1;
590 ret = add_cm_id_to_port_list(cm_id_priv, av, port);
592 rdma_destroy_ah_attr(&new_ah_attr);
595 rdma_move_ah_attr(&av->ah_attr, &new_ah_attr);
599 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
604 idr_preload(GFP_KERNEL);
605 spin_lock_irqsave(&cm.lock, flags);
607 id = idr_alloc_cyclic(&cm.local_id_table, cm_id_priv, 0, 0, GFP_NOWAIT);
609 spin_unlock_irqrestore(&cm.lock, flags);
612 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
613 return id < 0 ? id : 0;
616 static void cm_free_id(__be32 local_id)
618 spin_lock_irq(&cm.lock);
619 idr_remove(&cm.local_id_table,
620 (__force int) (local_id ^ cm.random_id_operand));
621 spin_unlock_irq(&cm.lock);
624 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
626 struct cm_id_private *cm_id_priv;
628 cm_id_priv = idr_find(&cm.local_id_table,
629 (__force int) (local_id ^ cm.random_id_operand));
631 if (cm_id_priv->id.remote_id == remote_id)
632 atomic_inc(&cm_id_priv->refcount);
640 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
642 struct cm_id_private *cm_id_priv;
644 spin_lock_irq(&cm.lock);
645 cm_id_priv = cm_get_id(local_id, remote_id);
646 spin_unlock_irq(&cm.lock);
652 * Trivial helpers to strip endian annotation and compare; the
653 * endianness doesn't actually matter since we just need a stable
654 * order for the RB tree.
656 static int be32_lt(__be32 a, __be32 b)
658 return (__force u32) a < (__force u32) b;
661 static int be32_gt(__be32 a, __be32 b)
663 return (__force u32) a > (__force u32) b;
666 static int be64_lt(__be64 a, __be64 b)
668 return (__force u64) a < (__force u64) b;
671 static int be64_gt(__be64 a, __be64 b)
673 return (__force u64) a > (__force u64) b;
676 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
678 struct rb_node **link = &cm.listen_service_table.rb_node;
679 struct rb_node *parent = NULL;
680 struct cm_id_private *cur_cm_id_priv;
681 __be64 service_id = cm_id_priv->id.service_id;
682 __be64 service_mask = cm_id_priv->id.service_mask;
686 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
688 if ((cur_cm_id_priv->id.service_mask & service_id) ==
689 (service_mask & cur_cm_id_priv->id.service_id) &&
690 (cm_id_priv->id.device == cur_cm_id_priv->id.device))
691 return cur_cm_id_priv;
693 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
694 link = &(*link)->rb_left;
695 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
696 link = &(*link)->rb_right;
697 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
698 link = &(*link)->rb_left;
699 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
700 link = &(*link)->rb_right;
702 link = &(*link)->rb_right;
704 rb_link_node(&cm_id_priv->service_node, parent, link);
705 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
709 static struct cm_id_private * cm_find_listen(struct ib_device *device,
712 struct rb_node *node = cm.listen_service_table.rb_node;
713 struct cm_id_private *cm_id_priv;
716 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
717 if ((cm_id_priv->id.service_mask & service_id) ==
718 cm_id_priv->id.service_id &&
719 (cm_id_priv->id.device == device))
722 if (device < cm_id_priv->id.device)
723 node = node->rb_left;
724 else if (device > cm_id_priv->id.device)
725 node = node->rb_right;
726 else if (be64_lt(service_id, cm_id_priv->id.service_id))
727 node = node->rb_left;
728 else if (be64_gt(service_id, cm_id_priv->id.service_id))
729 node = node->rb_right;
731 node = node->rb_right;
736 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
739 struct rb_node **link = &cm.remote_id_table.rb_node;
740 struct rb_node *parent = NULL;
741 struct cm_timewait_info *cur_timewait_info;
742 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
743 __be32 remote_id = timewait_info->work.remote_id;
747 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
749 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
750 link = &(*link)->rb_left;
751 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
752 link = &(*link)->rb_right;
753 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
754 link = &(*link)->rb_left;
755 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
756 link = &(*link)->rb_right;
758 return cur_timewait_info;
760 timewait_info->inserted_remote_id = 1;
761 rb_link_node(&timewait_info->remote_id_node, parent, link);
762 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
766 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
769 struct rb_node *node = cm.remote_id_table.rb_node;
770 struct cm_timewait_info *timewait_info;
773 timewait_info = rb_entry(node, struct cm_timewait_info,
775 if (be32_lt(remote_id, timewait_info->work.remote_id))
776 node = node->rb_left;
777 else if (be32_gt(remote_id, timewait_info->work.remote_id))
778 node = node->rb_right;
779 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
780 node = node->rb_left;
781 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
782 node = node->rb_right;
784 return timewait_info;
789 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
792 struct rb_node **link = &cm.remote_qp_table.rb_node;
793 struct rb_node *parent = NULL;
794 struct cm_timewait_info *cur_timewait_info;
795 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
796 __be32 remote_qpn = timewait_info->remote_qpn;
800 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
802 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
803 link = &(*link)->rb_left;
804 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
805 link = &(*link)->rb_right;
806 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
807 link = &(*link)->rb_left;
808 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
809 link = &(*link)->rb_right;
811 return cur_timewait_info;
813 timewait_info->inserted_remote_qp = 1;
814 rb_link_node(&timewait_info->remote_qp_node, parent, link);
815 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
819 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
822 struct rb_node **link = &cm.remote_sidr_table.rb_node;
823 struct rb_node *parent = NULL;
824 struct cm_id_private *cur_cm_id_priv;
825 union ib_gid *port_gid = &cm_id_priv->av.dgid;
826 __be32 remote_id = cm_id_priv->id.remote_id;
830 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
832 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
833 link = &(*link)->rb_left;
834 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
835 link = &(*link)->rb_right;
838 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
841 link = &(*link)->rb_left;
843 link = &(*link)->rb_right;
845 return cur_cm_id_priv;
848 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
849 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
853 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
854 enum ib_cm_sidr_status status)
856 struct ib_cm_sidr_rep_param param;
858 memset(¶m, 0, sizeof param);
859 param.status = status;
860 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m);
863 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
864 ib_cm_handler cm_handler,
867 struct cm_id_private *cm_id_priv;
870 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
872 return ERR_PTR(-ENOMEM);
874 cm_id_priv->id.state = IB_CM_IDLE;
875 cm_id_priv->id.device = device;
876 cm_id_priv->id.cm_handler = cm_handler;
877 cm_id_priv->id.context = context;
878 cm_id_priv->id.remote_cm_qpn = 1;
879 ret = cm_alloc_id(cm_id_priv);
883 spin_lock_init(&cm_id_priv->lock);
884 init_completion(&cm_id_priv->comp);
885 INIT_LIST_HEAD(&cm_id_priv->work_list);
886 INIT_LIST_HEAD(&cm_id_priv->prim_list);
887 INIT_LIST_HEAD(&cm_id_priv->altr_list);
888 atomic_set(&cm_id_priv->work_count, -1);
889 atomic_set(&cm_id_priv->refcount, 1);
890 return &cm_id_priv->id;
894 return ERR_PTR(-ENOMEM);
896 EXPORT_SYMBOL(ib_create_cm_id);
898 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
900 struct cm_work *work;
902 if (list_empty(&cm_id_priv->work_list))
905 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
906 list_del(&work->list);
910 static void cm_free_work(struct cm_work *work)
912 if (work->mad_recv_wc)
913 ib_free_recv_mad(work->mad_recv_wc);
917 static inline int cm_convert_to_ms(int iba_time)
919 /* approximate conversion to ms from 4.096us x 2^iba_time */
920 return 1 << max(iba_time - 8, 0);
924 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
925 * Because of how ack_timeout is stored, adding one doubles the timeout.
926 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
927 * increment it (round up) only if the other is within 50%.
929 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
931 int ack_timeout = packet_life_time + 1;
933 if (ack_timeout >= ca_ack_delay)
934 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
936 ack_timeout = ca_ack_delay +
937 (ack_timeout >= (ca_ack_delay - 1));
939 return min(31, ack_timeout);
942 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
944 if (timewait_info->inserted_remote_id) {
945 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
946 timewait_info->inserted_remote_id = 0;
949 if (timewait_info->inserted_remote_qp) {
950 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
951 timewait_info->inserted_remote_qp = 0;
955 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
957 struct cm_timewait_info *timewait_info;
959 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
961 return ERR_PTR(-ENOMEM);
963 timewait_info->work.local_id = local_id;
964 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
965 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
966 return timewait_info;
969 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
973 struct cm_device *cm_dev;
975 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client);
979 spin_lock_irqsave(&cm.lock, flags);
980 cm_cleanup_timewait(cm_id_priv->timewait_info);
981 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
982 spin_unlock_irqrestore(&cm.lock, flags);
985 * The cm_id could be destroyed by the user before we exit timewait.
986 * To protect against this, we search for the cm_id after exiting
987 * timewait before notifying the user that we've exited timewait.
989 cm_id_priv->id.state = IB_CM_TIMEWAIT;
990 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
992 /* Check if the device started its remove_one */
993 spin_lock_irqsave(&cm.lock, flags);
994 if (!cm_dev->going_down)
995 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
996 msecs_to_jiffies(wait_time));
997 spin_unlock_irqrestore(&cm.lock, flags);
999 cm_id_priv->timewait_info = NULL;
1002 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
1004 unsigned long flags;
1006 cm_id_priv->id.state = IB_CM_IDLE;
1007 if (cm_id_priv->timewait_info) {
1008 spin_lock_irqsave(&cm.lock, flags);
1009 cm_cleanup_timewait(cm_id_priv->timewait_info);
1010 spin_unlock_irqrestore(&cm.lock, flags);
1011 kfree(cm_id_priv->timewait_info);
1012 cm_id_priv->timewait_info = NULL;
1016 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
1018 struct cm_id_private *cm_id_priv;
1019 struct cm_work *work;
1021 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1023 spin_lock_irq(&cm_id_priv->lock);
1024 switch (cm_id->state) {
1026 spin_unlock_irq(&cm_id_priv->lock);
1028 spin_lock_irq(&cm.lock);
1029 if (--cm_id_priv->listen_sharecount > 0) {
1030 /* The id is still shared. */
1031 cm_deref_id(cm_id_priv);
1032 spin_unlock_irq(&cm.lock);
1035 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
1036 spin_unlock_irq(&cm.lock);
1038 case IB_CM_SIDR_REQ_SENT:
1039 cm_id->state = IB_CM_IDLE;
1040 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1041 spin_unlock_irq(&cm_id_priv->lock);
1043 case IB_CM_SIDR_REQ_RCVD:
1044 spin_unlock_irq(&cm_id_priv->lock);
1045 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
1046 spin_lock_irq(&cm.lock);
1047 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node))
1048 rb_erase(&cm_id_priv->sidr_id_node,
1049 &cm.remote_sidr_table);
1050 spin_unlock_irq(&cm.lock);
1052 case IB_CM_REQ_SENT:
1053 case IB_CM_MRA_REQ_RCVD:
1054 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1055 spin_unlock_irq(&cm_id_priv->lock);
1056 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
1057 &cm_id_priv->id.device->node_guid,
1058 sizeof cm_id_priv->id.device->node_guid,
1061 case IB_CM_REQ_RCVD:
1062 if (err == -ENOMEM) {
1063 /* Do not reject to allow future retries. */
1064 cm_reset_to_idle(cm_id_priv);
1065 spin_unlock_irq(&cm_id_priv->lock);
1067 spin_unlock_irq(&cm_id_priv->lock);
1068 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1072 case IB_CM_REP_SENT:
1073 case IB_CM_MRA_REP_RCVD:
1074 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1076 case IB_CM_MRA_REQ_SENT:
1077 case IB_CM_REP_RCVD:
1078 case IB_CM_MRA_REP_SENT:
1079 spin_unlock_irq(&cm_id_priv->lock);
1080 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1083 case IB_CM_ESTABLISHED:
1084 spin_unlock_irq(&cm_id_priv->lock);
1085 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT)
1087 ib_send_cm_dreq(cm_id, NULL, 0);
1089 case IB_CM_DREQ_SENT:
1090 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1091 cm_enter_timewait(cm_id_priv);
1092 spin_unlock_irq(&cm_id_priv->lock);
1094 case IB_CM_DREQ_RCVD:
1095 spin_unlock_irq(&cm_id_priv->lock);
1096 ib_send_cm_drep(cm_id, NULL, 0);
1099 spin_unlock_irq(&cm_id_priv->lock);
1103 spin_lock_irq(&cm.lock);
1104 if (!list_empty(&cm_id_priv->altr_list) &&
1105 (!cm_id_priv->altr_send_port_not_ready))
1106 list_del(&cm_id_priv->altr_list);
1107 if (!list_empty(&cm_id_priv->prim_list) &&
1108 (!cm_id_priv->prim_send_port_not_ready))
1109 list_del(&cm_id_priv->prim_list);
1110 spin_unlock_irq(&cm.lock);
1112 cm_free_id(cm_id->local_id);
1113 cm_deref_id(cm_id_priv);
1114 wait_for_completion(&cm_id_priv->comp);
1115 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
1118 rdma_destroy_ah_attr(&cm_id_priv->av.ah_attr);
1119 rdma_destroy_ah_attr(&cm_id_priv->alt_av.ah_attr);
1120 kfree(cm_id_priv->private_data);
1124 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
1126 cm_destroy_id(cm_id, 0);
1128 EXPORT_SYMBOL(ib_destroy_cm_id);
1131 * __ib_cm_listen - Initiates listening on the specified service ID for
1132 * connection and service ID resolution requests.
1133 * @cm_id: Connection identifier associated with the listen request.
1134 * @service_id: Service identifier matched against incoming connection
1135 * and service ID resolution requests. The service ID should be specified
1136 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1137 * assign a service ID to the caller.
1138 * @service_mask: Mask applied to service ID used to listen across a
1139 * range of service IDs. If set to 0, the service ID is matched
1140 * exactly. This parameter is ignored if %service_id is set to
1141 * IB_CM_ASSIGN_SERVICE_ID.
1143 static int __ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id,
1144 __be64 service_mask)
1146 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
1149 service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
1150 service_id &= service_mask;
1151 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
1152 (service_id != IB_CM_ASSIGN_SERVICE_ID))
1155 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1156 if (cm_id->state != IB_CM_IDLE)
1159 cm_id->state = IB_CM_LISTEN;
1160 ++cm_id_priv->listen_sharecount;
1162 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
1163 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
1164 cm_id->service_mask = ~cpu_to_be64(0);
1166 cm_id->service_id = service_id;
1167 cm_id->service_mask = service_mask;
1169 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
1171 if (cur_cm_id_priv) {
1172 cm_id->state = IB_CM_IDLE;
1173 --cm_id_priv->listen_sharecount;
1179 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask)
1181 unsigned long flags;
1184 spin_lock_irqsave(&cm.lock, flags);
1185 ret = __ib_cm_listen(cm_id, service_id, service_mask);
1186 spin_unlock_irqrestore(&cm.lock, flags);
1190 EXPORT_SYMBOL(ib_cm_listen);
1193 * Create a new listening ib_cm_id and listen on the given service ID.
1195 * If there's an existing ID listening on that same device and service ID,
1198 * @device: Device associated with the cm_id. All related communication will
1199 * be associated with the specified device.
1200 * @cm_handler: Callback invoked to notify the user of CM events.
1201 * @service_id: Service identifier matched against incoming connection
1202 * and service ID resolution requests. The service ID should be specified
1203 * network-byte order. If set to IB_CM_ASSIGN_SERVICE_ID, the CM will
1204 * assign a service ID to the caller.
1206 * Callers should call ib_destroy_cm_id when done with the listener ID.
1208 struct ib_cm_id *ib_cm_insert_listen(struct ib_device *device,
1209 ib_cm_handler cm_handler,
1212 struct cm_id_private *cm_id_priv;
1213 struct ib_cm_id *cm_id;
1214 unsigned long flags;
1217 /* Create an ID in advance, since the creation may sleep */
1218 cm_id = ib_create_cm_id(device, cm_handler, NULL);
1222 spin_lock_irqsave(&cm.lock, flags);
1224 if (service_id == IB_CM_ASSIGN_SERVICE_ID)
1227 /* Find an existing ID */
1228 cm_id_priv = cm_find_listen(device, service_id);
1230 if (cm_id->cm_handler != cm_handler || cm_id->context) {
1231 /* Sharing an ib_cm_id with different handlers is not
1233 spin_unlock_irqrestore(&cm.lock, flags);
1234 return ERR_PTR(-EINVAL);
1236 atomic_inc(&cm_id_priv->refcount);
1237 ++cm_id_priv->listen_sharecount;
1238 spin_unlock_irqrestore(&cm.lock, flags);
1240 ib_destroy_cm_id(cm_id);
1241 cm_id = &cm_id_priv->id;
1246 /* Use newly created ID */
1247 err = __ib_cm_listen(cm_id, service_id, 0);
1249 spin_unlock_irqrestore(&cm.lock, flags);
1252 ib_destroy_cm_id(cm_id);
1253 return ERR_PTR(err);
1257 EXPORT_SYMBOL(ib_cm_insert_listen);
1259 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv)
1261 u64 hi_tid, low_tid;
1263 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
1264 low_tid = (u64)cm_id_priv->id.local_id;
1265 return cpu_to_be64(hi_tid | low_tid);
1268 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
1269 __be16 attr_id, __be64 tid)
1271 hdr->base_version = IB_MGMT_BASE_VERSION;
1272 hdr->mgmt_class = IB_MGMT_CLASS_CM;
1273 hdr->class_version = IB_CM_CLASS_VERSION;
1274 hdr->method = IB_MGMT_METHOD_SEND;
1275 hdr->attr_id = attr_id;
1279 static void cm_format_req(struct cm_req_msg *req_msg,
1280 struct cm_id_private *cm_id_priv,
1281 struct ib_cm_req_param *param)
1283 struct sa_path_rec *pri_path = param->primary_path;
1284 struct sa_path_rec *alt_path = param->alternate_path;
1285 bool pri_ext = false;
1287 if (pri_path->rec_type == SA_PATH_REC_TYPE_OPA)
1288 pri_ext = opa_is_extended_lid(pri_path->opa.dlid,
1289 pri_path->opa.slid);
1291 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1292 cm_form_tid(cm_id_priv));
1294 req_msg->local_comm_id = cm_id_priv->id.local_id;
1295 req_msg->service_id = param->service_id;
1296 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1297 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
1298 cm_req_set_init_depth(req_msg, param->initiator_depth);
1299 cm_req_set_remote_resp_timeout(req_msg,
1300 param->remote_cm_response_timeout);
1301 cm_req_set_qp_type(req_msg, param->qp_type);
1302 cm_req_set_flow_ctrl(req_msg, param->flow_control);
1303 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
1304 cm_req_set_local_resp_timeout(req_msg,
1305 param->local_cm_response_timeout);
1306 req_msg->pkey = param->primary_path->pkey;
1307 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
1308 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
1310 if (param->qp_type != IB_QPT_XRC_INI) {
1311 cm_req_set_resp_res(req_msg, param->responder_resources);
1312 cm_req_set_retry_count(req_msg, param->retry_count);
1313 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
1314 cm_req_set_srq(req_msg, param->srq);
1317 req_msg->primary_local_gid = pri_path->sgid;
1318 req_msg->primary_remote_gid = pri_path->dgid;
1320 req_msg->primary_local_gid.global.interface_id
1321 = OPA_MAKE_ID(be32_to_cpu(pri_path->opa.slid));
1322 req_msg->primary_remote_gid.global.interface_id
1323 = OPA_MAKE_ID(be32_to_cpu(pri_path->opa.dlid));
1325 if (pri_path->hop_limit <= 1) {
1326 req_msg->primary_local_lid = pri_ext ? 0 :
1327 htons(ntohl(sa_path_get_slid(pri_path)));
1328 req_msg->primary_remote_lid = pri_ext ? 0 :
1329 htons(ntohl(sa_path_get_dlid(pri_path)));
1331 /* Work-around until there's a way to obtain remote LID info */
1332 req_msg->primary_local_lid = IB_LID_PERMISSIVE;
1333 req_msg->primary_remote_lid = IB_LID_PERMISSIVE;
1335 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label);
1336 cm_req_set_primary_packet_rate(req_msg, pri_path->rate);
1337 req_msg->primary_traffic_class = pri_path->traffic_class;
1338 req_msg->primary_hop_limit = pri_path->hop_limit;
1339 cm_req_set_primary_sl(req_msg, pri_path->sl);
1340 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1));
1341 cm_req_set_primary_local_ack_timeout(req_msg,
1342 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1343 pri_path->packet_life_time));
1346 bool alt_ext = false;
1348 if (alt_path->rec_type == SA_PATH_REC_TYPE_OPA)
1349 alt_ext = opa_is_extended_lid(alt_path->opa.dlid,
1350 alt_path->opa.slid);
1352 req_msg->alt_local_gid = alt_path->sgid;
1353 req_msg->alt_remote_gid = alt_path->dgid;
1355 req_msg->alt_local_gid.global.interface_id
1356 = OPA_MAKE_ID(be32_to_cpu(alt_path->opa.slid));
1357 req_msg->alt_remote_gid.global.interface_id
1358 = OPA_MAKE_ID(be32_to_cpu(alt_path->opa.dlid));
1360 if (alt_path->hop_limit <= 1) {
1361 req_msg->alt_local_lid = alt_ext ? 0 :
1362 htons(ntohl(sa_path_get_slid(alt_path)));
1363 req_msg->alt_remote_lid = alt_ext ? 0 :
1364 htons(ntohl(sa_path_get_dlid(alt_path)));
1366 req_msg->alt_local_lid = IB_LID_PERMISSIVE;
1367 req_msg->alt_remote_lid = IB_LID_PERMISSIVE;
1369 cm_req_set_alt_flow_label(req_msg,
1370 alt_path->flow_label);
1371 cm_req_set_alt_packet_rate(req_msg, alt_path->rate);
1372 req_msg->alt_traffic_class = alt_path->traffic_class;
1373 req_msg->alt_hop_limit = alt_path->hop_limit;
1374 cm_req_set_alt_sl(req_msg, alt_path->sl);
1375 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1));
1376 cm_req_set_alt_local_ack_timeout(req_msg,
1377 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1378 alt_path->packet_life_time));
1381 if (param->private_data && param->private_data_len)
1382 memcpy(req_msg->private_data, param->private_data,
1383 param->private_data_len);
1386 static int cm_validate_req_param(struct ib_cm_req_param *param)
1388 /* peer-to-peer not supported */
1389 if (param->peer_to_peer)
1392 if (!param->primary_path)
1395 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1396 param->qp_type != IB_QPT_XRC_INI)
1399 if (param->private_data &&
1400 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1403 if (param->alternate_path &&
1404 (param->alternate_path->pkey != param->primary_path->pkey ||
1405 param->alternate_path->mtu != param->primary_path->mtu))
1411 int ib_send_cm_req(struct ib_cm_id *cm_id,
1412 struct ib_cm_req_param *param)
1414 struct cm_id_private *cm_id_priv;
1415 struct cm_req_msg *req_msg;
1416 unsigned long flags;
1419 ret = cm_validate_req_param(param);
1423 /* Verify that we're not in timewait. */
1424 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1425 spin_lock_irqsave(&cm_id_priv->lock, flags);
1426 if (cm_id->state != IB_CM_IDLE) {
1427 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1431 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1433 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1435 if (IS_ERR(cm_id_priv->timewait_info)) {
1436 ret = PTR_ERR(cm_id_priv->timewait_info);
1440 ret = cm_init_av_by_path(param->primary_path,
1441 param->ppath_sgid_attr, &cm_id_priv->av,
1445 if (param->alternate_path) {
1446 ret = cm_init_av_by_path(param->alternate_path, NULL,
1447 &cm_id_priv->alt_av, cm_id_priv);
1451 cm_id->service_id = param->service_id;
1452 cm_id->service_mask = ~cpu_to_be64(0);
1453 cm_id_priv->timeout_ms = cm_convert_to_ms(
1454 param->primary_path->packet_life_time) * 2 +
1456 param->remote_cm_response_timeout);
1457 cm_id_priv->max_cm_retries = param->max_cm_retries;
1458 cm_id_priv->initiator_depth = param->initiator_depth;
1459 cm_id_priv->responder_resources = param->responder_resources;
1460 cm_id_priv->retry_count = param->retry_count;
1461 cm_id_priv->path_mtu = param->primary_path->mtu;
1462 cm_id_priv->pkey = param->primary_path->pkey;
1463 cm_id_priv->qp_type = param->qp_type;
1465 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1469 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1470 cm_format_req(req_msg, cm_id_priv, param);
1471 cm_id_priv->tid = req_msg->hdr.tid;
1472 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1473 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1475 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1476 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1478 spin_lock_irqsave(&cm_id_priv->lock, flags);
1479 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1481 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1484 BUG_ON(cm_id->state != IB_CM_IDLE);
1485 cm_id->state = IB_CM_REQ_SENT;
1486 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1489 error2: cm_free_msg(cm_id_priv->msg);
1490 error1: kfree(cm_id_priv->timewait_info);
1493 EXPORT_SYMBOL(ib_send_cm_req);
1495 static int cm_issue_rej(struct cm_port *port,
1496 struct ib_mad_recv_wc *mad_recv_wc,
1497 enum ib_cm_rej_reason reason,
1498 enum cm_msg_response msg_rejected,
1499 void *ari, u8 ari_length)
1501 struct ib_mad_send_buf *msg = NULL;
1502 struct cm_rej_msg *rej_msg, *rcv_msg;
1505 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1509 /* We just need common CM header information. Cast to any message. */
1510 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1511 rej_msg = (struct cm_rej_msg *) msg->mad;
1513 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1514 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1515 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1516 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1517 rej_msg->reason = cpu_to_be16(reason);
1519 if (ari && ari_length) {
1520 cm_rej_set_reject_info_len(rej_msg, ari_length);
1521 memcpy(rej_msg->ari, ari, ari_length);
1524 ret = ib_post_send_mad(msg, NULL);
1531 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1532 __be32 local_qpn, __be32 remote_qpn)
1534 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1535 ((local_ca_guid == remote_ca_guid) &&
1536 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1539 static bool cm_req_has_alt_path(struct cm_req_msg *req_msg)
1541 return ((req_msg->alt_local_lid) ||
1542 (ib_is_opa_gid(&req_msg->alt_local_gid)));
1545 static void cm_path_set_rec_type(struct ib_device *ib_device, u8 port_num,
1546 struct sa_path_rec *path, union ib_gid *gid)
1548 if (ib_is_opa_gid(gid) && rdma_cap_opa_ah(ib_device, port_num))
1549 path->rec_type = SA_PATH_REC_TYPE_OPA;
1551 path->rec_type = SA_PATH_REC_TYPE_IB;
1554 static void cm_format_path_lid_from_req(struct cm_req_msg *req_msg,
1555 struct sa_path_rec *primary_path,
1556 struct sa_path_rec *alt_path)
1560 if (primary_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1561 sa_path_set_dlid(primary_path,
1562 ntohs(req_msg->primary_local_lid));
1563 sa_path_set_slid(primary_path,
1564 ntohs(req_msg->primary_remote_lid));
1566 lid = opa_get_lid_from_gid(&req_msg->primary_local_gid);
1567 sa_path_set_dlid(primary_path, lid);
1569 lid = opa_get_lid_from_gid(&req_msg->primary_remote_gid);
1570 sa_path_set_slid(primary_path, lid);
1573 if (!cm_req_has_alt_path(req_msg))
1576 if (alt_path->rec_type != SA_PATH_REC_TYPE_OPA) {
1577 sa_path_set_dlid(alt_path, ntohs(req_msg->alt_local_lid));
1578 sa_path_set_slid(alt_path, ntohs(req_msg->alt_remote_lid));
1580 lid = opa_get_lid_from_gid(&req_msg->alt_local_gid);
1581 sa_path_set_dlid(alt_path, lid);
1583 lid = opa_get_lid_from_gid(&req_msg->alt_remote_gid);
1584 sa_path_set_slid(alt_path, lid);
1588 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1589 struct sa_path_rec *primary_path,
1590 struct sa_path_rec *alt_path)
1592 primary_path->dgid = req_msg->primary_local_gid;
1593 primary_path->sgid = req_msg->primary_remote_gid;
1594 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1595 primary_path->hop_limit = req_msg->primary_hop_limit;
1596 primary_path->traffic_class = req_msg->primary_traffic_class;
1597 primary_path->reversible = 1;
1598 primary_path->pkey = req_msg->pkey;
1599 primary_path->sl = cm_req_get_primary_sl(req_msg);
1600 primary_path->mtu_selector = IB_SA_EQ;
1601 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1602 primary_path->rate_selector = IB_SA_EQ;
1603 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1604 primary_path->packet_life_time_selector = IB_SA_EQ;
1605 primary_path->packet_life_time =
1606 cm_req_get_primary_local_ack_timeout(req_msg);
1607 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1608 primary_path->service_id = req_msg->service_id;
1609 if (sa_path_is_roce(primary_path))
1610 primary_path->roce.route_resolved = false;
1612 if (cm_req_has_alt_path(req_msg)) {
1613 alt_path->dgid = req_msg->alt_local_gid;
1614 alt_path->sgid = req_msg->alt_remote_gid;
1615 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1616 alt_path->hop_limit = req_msg->alt_hop_limit;
1617 alt_path->traffic_class = req_msg->alt_traffic_class;
1618 alt_path->reversible = 1;
1619 alt_path->pkey = req_msg->pkey;
1620 alt_path->sl = cm_req_get_alt_sl(req_msg);
1621 alt_path->mtu_selector = IB_SA_EQ;
1622 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1623 alt_path->rate_selector = IB_SA_EQ;
1624 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1625 alt_path->packet_life_time_selector = IB_SA_EQ;
1626 alt_path->packet_life_time =
1627 cm_req_get_alt_local_ack_timeout(req_msg);
1628 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1629 alt_path->service_id = req_msg->service_id;
1631 if (sa_path_is_roce(alt_path))
1632 alt_path->roce.route_resolved = false;
1634 cm_format_path_lid_from_req(req_msg, primary_path, alt_path);
1637 static u16 cm_get_bth_pkey(struct cm_work *work)
1639 struct ib_device *ib_dev = work->port->cm_dev->ib_device;
1640 u8 port_num = work->port->port_num;
1641 u16 pkey_index = work->mad_recv_wc->wc->pkey_index;
1645 ret = ib_get_cached_pkey(ib_dev, port_num, pkey_index, &pkey);
1647 dev_warn_ratelimited(&ib_dev->dev, "ib_cm: Couldn't retrieve pkey for incoming request (port %d, pkey index %d). %d\n",
1648 port_num, pkey_index, ret);
1656 * Convert OPA SGID to IB SGID
1657 * ULPs (such as IPoIB) do not understand OPA GIDs and will
1658 * reject them as the local_gid will not match the sgid. Therefore,
1659 * change the pathrec's SGID to an IB SGID.
1661 * @work: Work completion
1662 * @path: Path record
1664 static void cm_opa_to_ib_sgid(struct cm_work *work,
1665 struct sa_path_rec *path)
1667 struct ib_device *dev = work->port->cm_dev->ib_device;
1668 u8 port_num = work->port->port_num;
1670 if (rdma_cap_opa_ah(dev, port_num) &&
1671 (ib_is_opa_gid(&path->sgid))) {
1674 if (rdma_query_gid(dev, port_num, 0, &sgid)) {
1676 "Error updating sgid in CM request\n");
1684 static void cm_format_req_event(struct cm_work *work,
1685 struct cm_id_private *cm_id_priv,
1686 struct ib_cm_id *listen_id)
1688 struct cm_req_msg *req_msg;
1689 struct ib_cm_req_event_param *param;
1691 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1692 param = &work->cm_event.param.req_rcvd;
1693 param->listen_id = listen_id;
1694 param->bth_pkey = cm_get_bth_pkey(work);
1695 param->port = cm_id_priv->av.port->port_num;
1696 param->primary_path = &work->path[0];
1697 cm_opa_to_ib_sgid(work, param->primary_path);
1698 if (cm_req_has_alt_path(req_msg)) {
1699 param->alternate_path = &work->path[1];
1700 cm_opa_to_ib_sgid(work, param->alternate_path);
1702 param->alternate_path = NULL;
1704 param->remote_ca_guid = req_msg->local_ca_guid;
1705 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1706 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1707 param->qp_type = cm_req_get_qp_type(req_msg);
1708 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1709 param->responder_resources = cm_req_get_init_depth(req_msg);
1710 param->initiator_depth = cm_req_get_resp_res(req_msg);
1711 param->local_cm_response_timeout =
1712 cm_req_get_remote_resp_timeout(req_msg);
1713 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1714 param->remote_cm_response_timeout =
1715 cm_req_get_local_resp_timeout(req_msg);
1716 param->retry_count = cm_req_get_retry_count(req_msg);
1717 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1718 param->srq = cm_req_get_srq(req_msg);
1719 param->ppath_sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
1720 work->cm_event.private_data = &req_msg->private_data;
1723 static void cm_process_work(struct cm_id_private *cm_id_priv,
1724 struct cm_work *work)
1728 /* We will typically only have the current event to report. */
1729 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1732 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1733 spin_lock_irq(&cm_id_priv->lock);
1734 work = cm_dequeue_work(cm_id_priv);
1735 spin_unlock_irq(&cm_id_priv->lock);
1739 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1743 cm_deref_id(cm_id_priv);
1745 cm_destroy_id(&cm_id_priv->id, ret);
1748 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1749 struct cm_id_private *cm_id_priv,
1750 enum cm_msg_response msg_mraed, u8 service_timeout,
1751 const void *private_data, u8 private_data_len)
1753 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1754 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1755 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1756 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1757 cm_mra_set_service_timeout(mra_msg, service_timeout);
1759 if (private_data && private_data_len)
1760 memcpy(mra_msg->private_data, private_data, private_data_len);
1763 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1764 struct cm_id_private *cm_id_priv,
1765 enum ib_cm_rej_reason reason,
1768 const void *private_data,
1769 u8 private_data_len)
1771 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1772 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1774 switch(cm_id_priv->id.state) {
1775 case IB_CM_REQ_RCVD:
1776 rej_msg->local_comm_id = 0;
1777 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1779 case IB_CM_MRA_REQ_SENT:
1780 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1781 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1783 case IB_CM_REP_RCVD:
1784 case IB_CM_MRA_REP_SENT:
1785 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1786 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1789 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1790 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1794 rej_msg->reason = cpu_to_be16(reason);
1795 if (ari && ari_length) {
1796 cm_rej_set_reject_info_len(rej_msg, ari_length);
1797 memcpy(rej_msg->ari, ari, ari_length);
1800 if (private_data && private_data_len)
1801 memcpy(rej_msg->private_data, private_data, private_data_len);
1804 static void cm_dup_req_handler(struct cm_work *work,
1805 struct cm_id_private *cm_id_priv)
1807 struct ib_mad_send_buf *msg = NULL;
1810 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1811 counter[CM_REQ_COUNTER]);
1813 /* Quick state check to discard duplicate REQs. */
1814 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1817 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1821 spin_lock_irq(&cm_id_priv->lock);
1822 switch (cm_id_priv->id.state) {
1823 case IB_CM_MRA_REQ_SENT:
1824 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1825 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1826 cm_id_priv->private_data,
1827 cm_id_priv->private_data_len);
1829 case IB_CM_TIMEWAIT:
1830 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1831 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1836 spin_unlock_irq(&cm_id_priv->lock);
1838 ret = ib_post_send_mad(msg, NULL);
1843 unlock: spin_unlock_irq(&cm_id_priv->lock);
1844 free: cm_free_msg(msg);
1847 static struct cm_id_private * cm_match_req(struct cm_work *work,
1848 struct cm_id_private *cm_id_priv)
1850 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1851 struct cm_timewait_info *timewait_info;
1852 struct cm_req_msg *req_msg;
1853 struct ib_cm_id *cm_id;
1855 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1857 /* Check for possible duplicate REQ. */
1858 spin_lock_irq(&cm.lock);
1859 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1860 if (timewait_info) {
1861 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1862 timewait_info->work.remote_id);
1863 spin_unlock_irq(&cm.lock);
1864 if (cur_cm_id_priv) {
1865 cm_dup_req_handler(work, cur_cm_id_priv);
1866 cm_deref_id(cur_cm_id_priv);
1871 /* Check for stale connections. */
1872 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1873 if (timewait_info) {
1874 cm_cleanup_timewait(cm_id_priv->timewait_info);
1875 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1876 timewait_info->work.remote_id);
1878 spin_unlock_irq(&cm.lock);
1879 cm_issue_rej(work->port, work->mad_recv_wc,
1880 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1882 if (cur_cm_id_priv) {
1883 cm_id = &cur_cm_id_priv->id;
1884 ib_send_cm_dreq(cm_id, NULL, 0);
1885 cm_deref_id(cur_cm_id_priv);
1890 /* Find matching listen request. */
1891 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1892 req_msg->service_id);
1893 if (!listen_cm_id_priv) {
1894 cm_cleanup_timewait(cm_id_priv->timewait_info);
1895 spin_unlock_irq(&cm.lock);
1896 cm_issue_rej(work->port, work->mad_recv_wc,
1897 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1901 atomic_inc(&listen_cm_id_priv->refcount);
1902 atomic_inc(&cm_id_priv->refcount);
1903 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1904 atomic_inc(&cm_id_priv->work_count);
1905 spin_unlock_irq(&cm.lock);
1907 return listen_cm_id_priv;
1911 * Work-around for inter-subnet connections. If the LIDs are permissive,
1912 * we need to override the LID/SL data in the REQ with the LID information
1913 * in the work completion.
1915 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
1917 if (!cm_req_get_primary_subnet_local(req_msg)) {
1918 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) {
1919 req_msg->primary_local_lid = ib_lid_be16(wc->slid);
1920 cm_req_set_primary_sl(req_msg, wc->sl);
1923 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE)
1924 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1927 if (!cm_req_get_alt_subnet_local(req_msg)) {
1928 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) {
1929 req_msg->alt_local_lid = ib_lid_be16(wc->slid);
1930 cm_req_set_alt_sl(req_msg, wc->sl);
1933 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE)
1934 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1938 static int cm_req_handler(struct cm_work *work)
1940 struct ib_cm_id *cm_id;
1941 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1942 struct cm_req_msg *req_msg;
1943 const struct ib_global_route *grh;
1944 const struct ib_gid_attr *gid_attr;
1947 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1949 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
1951 return PTR_ERR(cm_id);
1953 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1954 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1955 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1956 work->mad_recv_wc->recv_buf.grh,
1960 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1962 if (IS_ERR(cm_id_priv->timewait_info)) {
1963 ret = PTR_ERR(cm_id_priv->timewait_info);
1966 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1967 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1968 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1970 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1971 if (!listen_cm_id_priv) {
1972 pr_debug("%s: local_id %d, no listen_cm_id_priv\n", __func__,
1973 be32_to_cpu(cm_id->local_id));
1978 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1979 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1980 cm_id_priv->id.service_id = req_msg->service_id;
1981 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1983 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
1985 memset(&work->path[0], 0, sizeof(work->path[0]));
1986 if (cm_req_has_alt_path(req_msg))
1987 memset(&work->path[1], 0, sizeof(work->path[1]));
1988 grh = rdma_ah_read_grh(&cm_id_priv->av.ah_attr);
1989 gid_attr = grh->sgid_attr;
1991 if (gid_attr && gid_attr->ndev) {
1992 work->path[0].rec_type =
1993 sa_conv_gid_to_pathrec_type(gid_attr->gid_type);
1995 /* If no GID attribute or ndev is null, it is not RoCE. */
1996 cm_path_set_rec_type(work->port->cm_dev->ib_device,
1997 work->port->port_num,
1999 &req_msg->primary_local_gid);
2001 if (cm_req_has_alt_path(req_msg))
2002 work->path[1].rec_type = work->path[0].rec_type;
2003 cm_format_paths_from_req(req_msg, &work->path[0],
2005 if (cm_id_priv->av.ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE)
2006 sa_path_set_dmac(&work->path[0],
2007 cm_id_priv->av.ah_attr.roce.dmac);
2008 work->path[0].hop_limit = grh->hop_limit;
2009 ret = cm_init_av_by_path(&work->path[0], gid_attr, &cm_id_priv->av,
2014 err = rdma_query_gid(work->port->cm_dev->ib_device,
2015 work->port->port_num, 0,
2016 &work->path[0].sgid);
2018 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
2021 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
2022 &work->path[0].sgid,
2023 sizeof(work->path[0].sgid),
2027 if (cm_req_has_alt_path(req_msg)) {
2028 ret = cm_init_av_by_path(&work->path[1], NULL,
2029 &cm_id_priv->alt_av, cm_id_priv);
2031 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
2032 &work->path[0].sgid,
2033 sizeof(work->path[0].sgid), NULL, 0);
2037 cm_id_priv->tid = req_msg->hdr.tid;
2038 cm_id_priv->timeout_ms = cm_convert_to_ms(
2039 cm_req_get_local_resp_timeout(req_msg));
2040 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
2041 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
2042 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
2043 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
2044 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
2045 cm_id_priv->pkey = req_msg->pkey;
2046 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
2047 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
2048 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
2049 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
2051 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
2052 cm_process_work(cm_id_priv, work);
2053 cm_deref_id(listen_cm_id_priv);
2057 atomic_dec(&cm_id_priv->refcount);
2058 cm_deref_id(listen_cm_id_priv);
2060 kfree(cm_id_priv->timewait_info);
2062 ib_destroy_cm_id(cm_id);
2066 static void cm_format_rep(struct cm_rep_msg *rep_msg,
2067 struct cm_id_private *cm_id_priv,
2068 struct ib_cm_rep_param *param)
2070 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
2071 rep_msg->local_comm_id = cm_id_priv->id.local_id;
2072 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2073 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
2074 rep_msg->resp_resources = param->responder_resources;
2075 cm_rep_set_target_ack_delay(rep_msg,
2076 cm_id_priv->av.port->cm_dev->ack_delay);
2077 cm_rep_set_failover(rep_msg, param->failover_accepted);
2078 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
2079 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
2081 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
2082 rep_msg->initiator_depth = param->initiator_depth;
2083 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
2084 cm_rep_set_srq(rep_msg, param->srq);
2085 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
2087 cm_rep_set_srq(rep_msg, 1);
2088 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num));
2091 if (param->private_data && param->private_data_len)
2092 memcpy(rep_msg->private_data, param->private_data,
2093 param->private_data_len);
2096 int ib_send_cm_rep(struct ib_cm_id *cm_id,
2097 struct ib_cm_rep_param *param)
2099 struct cm_id_private *cm_id_priv;
2100 struct ib_mad_send_buf *msg;
2101 struct cm_rep_msg *rep_msg;
2102 unsigned long flags;
2105 if (param->private_data &&
2106 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
2109 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2110 spin_lock_irqsave(&cm_id_priv->lock, flags);
2111 if (cm_id->state != IB_CM_REQ_RCVD &&
2112 cm_id->state != IB_CM_MRA_REQ_SENT) {
2113 pr_debug("%s: local_comm_id %d, cm_id->state: %d\n", __func__,
2114 be32_to_cpu(cm_id_priv->id.local_id), cm_id->state);
2119 ret = cm_alloc_msg(cm_id_priv, &msg);
2123 rep_msg = (struct cm_rep_msg *) msg->mad;
2124 cm_format_rep(rep_msg, cm_id_priv, param);
2125 msg->timeout_ms = cm_id_priv->timeout_ms;
2126 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
2128 ret = ib_post_send_mad(msg, NULL);
2130 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2135 cm_id->state = IB_CM_REP_SENT;
2136 cm_id_priv->msg = msg;
2137 cm_id_priv->initiator_depth = param->initiator_depth;
2138 cm_id_priv->responder_resources = param->responder_resources;
2139 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
2140 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
2142 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2145 EXPORT_SYMBOL(ib_send_cm_rep);
2147 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
2148 struct cm_id_private *cm_id_priv,
2149 const void *private_data,
2150 u8 private_data_len)
2152 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
2153 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
2154 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
2156 if (private_data && private_data_len)
2157 memcpy(rtu_msg->private_data, private_data, private_data_len);
2160 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
2161 const void *private_data,
2162 u8 private_data_len)
2164 struct cm_id_private *cm_id_priv;
2165 struct ib_mad_send_buf *msg;
2166 unsigned long flags;
2170 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
2173 data = cm_copy_private_data(private_data, private_data_len);
2175 return PTR_ERR(data);
2177 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2178 spin_lock_irqsave(&cm_id_priv->lock, flags);
2179 if (cm_id->state != IB_CM_REP_RCVD &&
2180 cm_id->state != IB_CM_MRA_REP_SENT) {
2181 pr_debug("%s: local_id %d, cm_id->state %d\n", __func__,
2182 be32_to_cpu(cm_id->local_id), cm_id->state);
2187 ret = cm_alloc_msg(cm_id_priv, &msg);
2191 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2192 private_data, private_data_len);
2194 ret = ib_post_send_mad(msg, NULL);
2196 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2202 cm_id->state = IB_CM_ESTABLISHED;
2203 cm_set_private_data(cm_id_priv, data, private_data_len);
2204 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2207 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2211 EXPORT_SYMBOL(ib_send_cm_rtu);
2213 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
2215 struct cm_rep_msg *rep_msg;
2216 struct ib_cm_rep_event_param *param;
2218 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2219 param = &work->cm_event.param.rep_rcvd;
2220 param->remote_ca_guid = rep_msg->local_ca_guid;
2221 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
2222 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
2223 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
2224 param->responder_resources = rep_msg->initiator_depth;
2225 param->initiator_depth = rep_msg->resp_resources;
2226 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
2227 param->failover_accepted = cm_rep_get_failover(rep_msg);
2228 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
2229 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
2230 param->srq = cm_rep_get_srq(rep_msg);
2231 work->cm_event.private_data = &rep_msg->private_data;
2234 static void cm_dup_rep_handler(struct cm_work *work)
2236 struct cm_id_private *cm_id_priv;
2237 struct cm_rep_msg *rep_msg;
2238 struct ib_mad_send_buf *msg = NULL;
2241 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
2242 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
2243 rep_msg->local_comm_id);
2247 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2248 counter[CM_REP_COUNTER]);
2249 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
2253 spin_lock_irq(&cm_id_priv->lock);
2254 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
2255 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
2256 cm_id_priv->private_data,
2257 cm_id_priv->private_data_len);
2258 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
2259 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2260 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
2261 cm_id_priv->private_data,
2262 cm_id_priv->private_data_len);
2265 spin_unlock_irq(&cm_id_priv->lock);
2267 ret = ib_post_send_mad(msg, NULL);
2272 unlock: spin_unlock_irq(&cm_id_priv->lock);
2273 free: cm_free_msg(msg);
2274 deref: cm_deref_id(cm_id_priv);
2277 static int cm_rep_handler(struct cm_work *work)
2279 struct cm_id_private *cm_id_priv;
2280 struct cm_rep_msg *rep_msg;
2282 struct cm_id_private *cur_cm_id_priv;
2283 struct ib_cm_id *cm_id;
2284 struct cm_timewait_info *timewait_info;
2286 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
2287 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
2289 cm_dup_rep_handler(work);
2290 pr_debug("%s: remote_comm_id %d, no cm_id_priv\n", __func__,
2291 be32_to_cpu(rep_msg->remote_comm_id));
2295 cm_format_rep_event(work, cm_id_priv->qp_type);
2297 spin_lock_irq(&cm_id_priv->lock);
2298 switch (cm_id_priv->id.state) {
2299 case IB_CM_REQ_SENT:
2300 case IB_CM_MRA_REQ_RCVD:
2303 spin_unlock_irq(&cm_id_priv->lock);
2305 pr_debug("%s: cm_id_priv->id.state: %d, local_comm_id %d, remote_comm_id %d\n",
2306 __func__, cm_id_priv->id.state,
2307 be32_to_cpu(rep_msg->local_comm_id),
2308 be32_to_cpu(rep_msg->remote_comm_id));
2312 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
2313 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
2314 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2316 spin_lock(&cm.lock);
2317 /* Check for duplicate REP. */
2318 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
2319 spin_unlock(&cm.lock);
2320 spin_unlock_irq(&cm_id_priv->lock);
2322 pr_debug("%s: Failed to insert remote id %d\n", __func__,
2323 be32_to_cpu(rep_msg->remote_comm_id));
2326 /* Check for a stale connection. */
2327 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
2328 if (timewait_info) {
2329 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
2330 &cm.remote_id_table);
2331 cm_id_priv->timewait_info->inserted_remote_id = 0;
2332 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
2333 timewait_info->work.remote_id);
2335 spin_unlock(&cm.lock);
2336 spin_unlock_irq(&cm_id_priv->lock);
2337 cm_issue_rej(work->port, work->mad_recv_wc,
2338 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
2341 pr_debug("%s: Stale connection. local_comm_id %d, remote_comm_id %d\n",
2342 __func__, be32_to_cpu(rep_msg->local_comm_id),
2343 be32_to_cpu(rep_msg->remote_comm_id));
2345 if (cur_cm_id_priv) {
2346 cm_id = &cur_cm_id_priv->id;
2347 ib_send_cm_dreq(cm_id, NULL, 0);
2348 cm_deref_id(cur_cm_id_priv);
2353 spin_unlock(&cm.lock);
2355 cm_id_priv->id.state = IB_CM_REP_RCVD;
2356 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
2357 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
2358 cm_id_priv->initiator_depth = rep_msg->resp_resources;
2359 cm_id_priv->responder_resources = rep_msg->initiator_depth;
2360 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
2361 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
2362 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
2363 cm_id_priv->av.timeout =
2364 cm_ack_timeout(cm_id_priv->target_ack_delay,
2365 cm_id_priv->av.timeout - 1);
2366 cm_id_priv->alt_av.timeout =
2367 cm_ack_timeout(cm_id_priv->target_ack_delay,
2368 cm_id_priv->alt_av.timeout - 1);
2370 /* todo: handle peer_to_peer */
2372 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2373 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2375 list_add_tail(&work->list, &cm_id_priv->work_list);
2376 spin_unlock_irq(&cm_id_priv->lock);
2379 cm_process_work(cm_id_priv, work);
2381 cm_deref_id(cm_id_priv);
2385 cm_deref_id(cm_id_priv);
2389 static int cm_establish_handler(struct cm_work *work)
2391 struct cm_id_private *cm_id_priv;
2394 /* See comment in cm_establish about lookup. */
2395 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
2399 spin_lock_irq(&cm_id_priv->lock);
2400 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
2401 spin_unlock_irq(&cm_id_priv->lock);
2405 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2406 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2408 list_add_tail(&work->list, &cm_id_priv->work_list);
2409 spin_unlock_irq(&cm_id_priv->lock);
2412 cm_process_work(cm_id_priv, work);
2414 cm_deref_id(cm_id_priv);
2417 cm_deref_id(cm_id_priv);
2421 static int cm_rtu_handler(struct cm_work *work)
2423 struct cm_id_private *cm_id_priv;
2424 struct cm_rtu_msg *rtu_msg;
2427 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
2428 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
2429 rtu_msg->local_comm_id);
2433 work->cm_event.private_data = &rtu_msg->private_data;
2435 spin_lock_irq(&cm_id_priv->lock);
2436 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
2437 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
2438 spin_unlock_irq(&cm_id_priv->lock);
2439 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2440 counter[CM_RTU_COUNTER]);
2443 cm_id_priv->id.state = IB_CM_ESTABLISHED;
2445 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2446 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2448 list_add_tail(&work->list, &cm_id_priv->work_list);
2449 spin_unlock_irq(&cm_id_priv->lock);
2452 cm_process_work(cm_id_priv, work);
2454 cm_deref_id(cm_id_priv);
2457 cm_deref_id(cm_id_priv);
2461 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
2462 struct cm_id_private *cm_id_priv,
2463 const void *private_data,
2464 u8 private_data_len)
2466 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
2467 cm_form_tid(cm_id_priv));
2468 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
2469 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
2470 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
2472 if (private_data && private_data_len)
2473 memcpy(dreq_msg->private_data, private_data, private_data_len);
2476 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
2477 const void *private_data,
2478 u8 private_data_len)
2480 struct cm_id_private *cm_id_priv;
2481 struct ib_mad_send_buf *msg;
2482 unsigned long flags;
2485 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
2488 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2489 spin_lock_irqsave(&cm_id_priv->lock, flags);
2490 if (cm_id->state != IB_CM_ESTABLISHED) {
2491 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__,
2492 be32_to_cpu(cm_id->local_id), cm_id->state);
2497 if (cm_id->lap_state == IB_CM_LAP_SENT ||
2498 cm_id->lap_state == IB_CM_MRA_LAP_RCVD)
2499 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2501 ret = cm_alloc_msg(cm_id_priv, &msg);
2503 cm_enter_timewait(cm_id_priv);
2507 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2508 private_data, private_data_len);
2509 msg->timeout_ms = cm_id_priv->timeout_ms;
2510 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2512 ret = ib_post_send_mad(msg, NULL);
2514 cm_enter_timewait(cm_id_priv);
2515 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2520 cm_id->state = IB_CM_DREQ_SENT;
2521 cm_id_priv->msg = msg;
2522 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2525 EXPORT_SYMBOL(ib_send_cm_dreq);
2527 static void cm_format_drep(struct cm_drep_msg *drep_msg,
2528 struct cm_id_private *cm_id_priv,
2529 const void *private_data,
2530 u8 private_data_len)
2532 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2533 drep_msg->local_comm_id = cm_id_priv->id.local_id;
2534 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2536 if (private_data && private_data_len)
2537 memcpy(drep_msg->private_data, private_data, private_data_len);
2540 int ib_send_cm_drep(struct ib_cm_id *cm_id,
2541 const void *private_data,
2542 u8 private_data_len)
2544 struct cm_id_private *cm_id_priv;
2545 struct ib_mad_send_buf *msg;
2546 unsigned long flags;
2550 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2553 data = cm_copy_private_data(private_data, private_data_len);
2555 return PTR_ERR(data);
2557 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2558 spin_lock_irqsave(&cm_id_priv->lock, flags);
2559 if (cm_id->state != IB_CM_DREQ_RCVD) {
2560 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2562 pr_debug("%s: local_id %d, cm_idcm_id->state(%d) != IB_CM_DREQ_RCVD\n",
2563 __func__, be32_to_cpu(cm_id->local_id), cm_id->state);
2567 cm_set_private_data(cm_id_priv, data, private_data_len);
2568 cm_enter_timewait(cm_id_priv);
2570 ret = cm_alloc_msg(cm_id_priv, &msg);
2574 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2575 private_data, private_data_len);
2577 ret = ib_post_send_mad(msg, NULL);
2579 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2584 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2587 EXPORT_SYMBOL(ib_send_cm_drep);
2589 static int cm_issue_drep(struct cm_port *port,
2590 struct ib_mad_recv_wc *mad_recv_wc)
2592 struct ib_mad_send_buf *msg = NULL;
2593 struct cm_dreq_msg *dreq_msg;
2594 struct cm_drep_msg *drep_msg;
2597 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2601 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2602 drep_msg = (struct cm_drep_msg *) msg->mad;
2604 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2605 drep_msg->remote_comm_id = dreq_msg->local_comm_id;
2606 drep_msg->local_comm_id = dreq_msg->remote_comm_id;
2608 ret = ib_post_send_mad(msg, NULL);
2615 static int cm_dreq_handler(struct cm_work *work)
2617 struct cm_id_private *cm_id_priv;
2618 struct cm_dreq_msg *dreq_msg;
2619 struct ib_mad_send_buf *msg = NULL;
2622 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2623 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
2624 dreq_msg->local_comm_id);
2626 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2627 counter[CM_DREQ_COUNTER]);
2628 cm_issue_drep(work->port, work->mad_recv_wc);
2629 pr_debug("%s: no cm_id_priv, local_comm_id %d, remote_comm_id %d\n",
2630 __func__, be32_to_cpu(dreq_msg->local_comm_id),
2631 be32_to_cpu(dreq_msg->remote_comm_id));
2635 work->cm_event.private_data = &dreq_msg->private_data;
2637 spin_lock_irq(&cm_id_priv->lock);
2638 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
2641 switch (cm_id_priv->id.state) {
2642 case IB_CM_REP_SENT:
2643 case IB_CM_DREQ_SENT:
2644 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2646 case IB_CM_ESTABLISHED:
2647 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2648 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2649 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2651 case IB_CM_MRA_REP_RCVD:
2653 case IB_CM_TIMEWAIT:
2654 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2655 counter[CM_DREQ_COUNTER]);
2656 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
2660 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2661 cm_id_priv->private_data,
2662 cm_id_priv->private_data_len);
2663 spin_unlock_irq(&cm_id_priv->lock);
2665 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
2666 ib_post_send_mad(msg, NULL))
2669 case IB_CM_DREQ_RCVD:
2670 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2671 counter[CM_DREQ_COUNTER]);
2674 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
2675 __func__, be32_to_cpu(cm_id_priv->id.local_id),
2676 cm_id_priv->id.state);
2679 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2680 cm_id_priv->tid = dreq_msg->hdr.tid;
2681 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2683 list_add_tail(&work->list, &cm_id_priv->work_list);
2684 spin_unlock_irq(&cm_id_priv->lock);
2687 cm_process_work(cm_id_priv, work);
2689 cm_deref_id(cm_id_priv);
2692 unlock: spin_unlock_irq(&cm_id_priv->lock);
2693 deref: cm_deref_id(cm_id_priv);
2697 static int cm_drep_handler(struct cm_work *work)
2699 struct cm_id_private *cm_id_priv;
2700 struct cm_drep_msg *drep_msg;
2703 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2704 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2705 drep_msg->local_comm_id);
2709 work->cm_event.private_data = &drep_msg->private_data;
2711 spin_lock_irq(&cm_id_priv->lock);
2712 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2713 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2714 spin_unlock_irq(&cm_id_priv->lock);
2717 cm_enter_timewait(cm_id_priv);
2719 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2720 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2722 list_add_tail(&work->list, &cm_id_priv->work_list);
2723 spin_unlock_irq(&cm_id_priv->lock);
2726 cm_process_work(cm_id_priv, work);
2728 cm_deref_id(cm_id_priv);
2731 cm_deref_id(cm_id_priv);
2735 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2736 enum ib_cm_rej_reason reason,
2739 const void *private_data,
2740 u8 private_data_len)
2742 struct cm_id_private *cm_id_priv;
2743 struct ib_mad_send_buf *msg;
2744 unsigned long flags;
2747 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2748 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2751 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2753 spin_lock_irqsave(&cm_id_priv->lock, flags);
2754 switch (cm_id->state) {
2755 case IB_CM_REQ_SENT:
2756 case IB_CM_MRA_REQ_RCVD:
2757 case IB_CM_REQ_RCVD:
2758 case IB_CM_MRA_REQ_SENT:
2759 case IB_CM_REP_RCVD:
2760 case IB_CM_MRA_REP_SENT:
2761 ret = cm_alloc_msg(cm_id_priv, &msg);
2763 cm_format_rej((struct cm_rej_msg *) msg->mad,
2764 cm_id_priv, reason, ari, ari_length,
2765 private_data, private_data_len);
2767 cm_reset_to_idle(cm_id_priv);
2769 case IB_CM_REP_SENT:
2770 case IB_CM_MRA_REP_RCVD:
2771 ret = cm_alloc_msg(cm_id_priv, &msg);
2773 cm_format_rej((struct cm_rej_msg *) msg->mad,
2774 cm_id_priv, reason, ari, ari_length,
2775 private_data, private_data_len);
2777 cm_enter_timewait(cm_id_priv);
2780 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__,
2781 be32_to_cpu(cm_id_priv->id.local_id), cm_id->state);
2789 ret = ib_post_send_mad(msg, NULL);
2793 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2796 EXPORT_SYMBOL(ib_send_cm_rej);
2798 static void cm_format_rej_event(struct cm_work *work)
2800 struct cm_rej_msg *rej_msg;
2801 struct ib_cm_rej_event_param *param;
2803 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2804 param = &work->cm_event.param.rej_rcvd;
2805 param->ari = rej_msg->ari;
2806 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2807 param->reason = __be16_to_cpu(rej_msg->reason);
2808 work->cm_event.private_data = &rej_msg->private_data;
2811 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2813 struct cm_timewait_info *timewait_info;
2814 struct cm_id_private *cm_id_priv;
2817 remote_id = rej_msg->local_comm_id;
2819 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2820 spin_lock_irq(&cm.lock);
2821 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2823 if (!timewait_info) {
2824 spin_unlock_irq(&cm.lock);
2827 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2828 (timewait_info->work.local_id ^
2829 cm.random_id_operand));
2831 if (cm_id_priv->id.remote_id == remote_id)
2832 atomic_inc(&cm_id_priv->refcount);
2836 spin_unlock_irq(&cm.lock);
2837 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2838 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2840 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2845 static int cm_rej_handler(struct cm_work *work)
2847 struct cm_id_private *cm_id_priv;
2848 struct cm_rej_msg *rej_msg;
2851 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2852 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2856 cm_format_rej_event(work);
2858 spin_lock_irq(&cm_id_priv->lock);
2859 switch (cm_id_priv->id.state) {
2860 case IB_CM_REQ_SENT:
2861 case IB_CM_MRA_REQ_RCVD:
2862 case IB_CM_REP_SENT:
2863 case IB_CM_MRA_REP_RCVD:
2864 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2866 case IB_CM_REQ_RCVD:
2867 case IB_CM_MRA_REQ_SENT:
2868 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2869 cm_enter_timewait(cm_id_priv);
2871 cm_reset_to_idle(cm_id_priv);
2873 case IB_CM_DREQ_SENT:
2874 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2876 case IB_CM_REP_RCVD:
2877 case IB_CM_MRA_REP_SENT:
2878 cm_enter_timewait(cm_id_priv);
2880 case IB_CM_ESTABLISHED:
2881 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
2882 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
2883 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
2884 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2886 cm_enter_timewait(cm_id_priv);
2891 spin_unlock_irq(&cm_id_priv->lock);
2892 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
2893 __func__, be32_to_cpu(cm_id_priv->id.local_id),
2894 cm_id_priv->id.state);
2899 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2901 list_add_tail(&work->list, &cm_id_priv->work_list);
2902 spin_unlock_irq(&cm_id_priv->lock);
2905 cm_process_work(cm_id_priv, work);
2907 cm_deref_id(cm_id_priv);
2910 cm_deref_id(cm_id_priv);
2914 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2916 const void *private_data,
2917 u8 private_data_len)
2919 struct cm_id_private *cm_id_priv;
2920 struct ib_mad_send_buf *msg;
2921 enum ib_cm_state cm_state;
2922 enum ib_cm_lap_state lap_state;
2923 enum cm_msg_response msg_response;
2925 unsigned long flags;
2928 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2931 data = cm_copy_private_data(private_data, private_data_len);
2933 return PTR_ERR(data);
2935 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2937 spin_lock_irqsave(&cm_id_priv->lock, flags);
2938 switch(cm_id_priv->id.state) {
2939 case IB_CM_REQ_RCVD:
2940 cm_state = IB_CM_MRA_REQ_SENT;
2941 lap_state = cm_id->lap_state;
2942 msg_response = CM_MSG_RESPONSE_REQ;
2944 case IB_CM_REP_RCVD:
2945 cm_state = IB_CM_MRA_REP_SENT;
2946 lap_state = cm_id->lap_state;
2947 msg_response = CM_MSG_RESPONSE_REP;
2949 case IB_CM_ESTABLISHED:
2950 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
2951 cm_state = cm_id->state;
2952 lap_state = IB_CM_MRA_LAP_SENT;
2953 msg_response = CM_MSG_RESPONSE_OTHER;
2958 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
2959 __func__, be32_to_cpu(cm_id_priv->id.local_id),
2960 cm_id_priv->id.state);
2965 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
2966 ret = cm_alloc_msg(cm_id_priv, &msg);
2970 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2971 msg_response, service_timeout,
2972 private_data, private_data_len);
2973 ret = ib_post_send_mad(msg, NULL);
2978 cm_id->state = cm_state;
2979 cm_id->lap_state = lap_state;
2980 cm_id_priv->service_timeout = service_timeout;
2981 cm_set_private_data(cm_id_priv, data, private_data_len);
2982 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2985 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2989 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2994 EXPORT_SYMBOL(ib_send_cm_mra);
2996 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2998 switch (cm_mra_get_msg_mraed(mra_msg)) {
2999 case CM_MSG_RESPONSE_REQ:
3000 return cm_acquire_id(mra_msg->remote_comm_id, 0);
3001 case CM_MSG_RESPONSE_REP:
3002 case CM_MSG_RESPONSE_OTHER:
3003 return cm_acquire_id(mra_msg->remote_comm_id,
3004 mra_msg->local_comm_id);
3010 static int cm_mra_handler(struct cm_work *work)
3012 struct cm_id_private *cm_id_priv;
3013 struct cm_mra_msg *mra_msg;
3016 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
3017 cm_id_priv = cm_acquire_mraed_id(mra_msg);
3021 work->cm_event.private_data = &mra_msg->private_data;
3022 work->cm_event.param.mra_rcvd.service_timeout =
3023 cm_mra_get_service_timeout(mra_msg);
3024 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
3025 cm_convert_to_ms(cm_id_priv->av.timeout);
3027 spin_lock_irq(&cm_id_priv->lock);
3028 switch (cm_id_priv->id.state) {
3029 case IB_CM_REQ_SENT:
3030 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
3031 ib_modify_mad(cm_id_priv->av.port->mad_agent,
3032 cm_id_priv->msg, timeout))
3034 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
3036 case IB_CM_REP_SENT:
3037 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
3038 ib_modify_mad(cm_id_priv->av.port->mad_agent,
3039 cm_id_priv->msg, timeout))
3041 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
3043 case IB_CM_ESTABLISHED:
3044 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
3045 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
3046 ib_modify_mad(cm_id_priv->av.port->mad_agent,
3047 cm_id_priv->msg, timeout)) {
3048 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
3049 atomic_long_inc(&work->port->
3050 counter_group[CM_RECV_DUPLICATES].
3051 counter[CM_MRA_COUNTER]);
3054 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
3056 case IB_CM_MRA_REQ_RCVD:
3057 case IB_CM_MRA_REP_RCVD:
3058 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3059 counter[CM_MRA_COUNTER]);
3062 pr_debug("%s local_id %d, cm_id_priv->id.state: %d\n",
3063 __func__, be32_to_cpu(cm_id_priv->id.local_id),
3064 cm_id_priv->id.state);
3068 cm_id_priv->msg->context[1] = (void *) (unsigned long)
3069 cm_id_priv->id.state;
3070 ret = atomic_inc_and_test(&cm_id_priv->work_count);
3072 list_add_tail(&work->list, &cm_id_priv->work_list);
3073 spin_unlock_irq(&cm_id_priv->lock);
3076 cm_process_work(cm_id_priv, work);
3078 cm_deref_id(cm_id_priv);
3081 spin_unlock_irq(&cm_id_priv->lock);
3082 cm_deref_id(cm_id_priv);
3086 static void cm_format_lap(struct cm_lap_msg *lap_msg,
3087 struct cm_id_private *cm_id_priv,
3088 struct sa_path_rec *alternate_path,
3089 const void *private_data,
3090 u8 private_data_len)
3092 bool alt_ext = false;
3094 if (alternate_path->rec_type == SA_PATH_REC_TYPE_OPA)
3095 alt_ext = opa_is_extended_lid(alternate_path->opa.dlid,
3096 alternate_path->opa.slid);
3097 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
3098 cm_form_tid(cm_id_priv));
3099 lap_msg->local_comm_id = cm_id_priv->id.local_id;
3100 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
3101 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
3102 /* todo: need remote CM response timeout */
3103 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
3104 lap_msg->alt_local_lid =
3105 htons(ntohl(sa_path_get_slid(alternate_path)));
3106 lap_msg->alt_remote_lid =
3107 htons(ntohl(sa_path_get_dlid(alternate_path)));
3108 lap_msg->alt_local_gid = alternate_path->sgid;
3109 lap_msg->alt_remote_gid = alternate_path->dgid;
3111 lap_msg->alt_local_gid.global.interface_id
3112 = OPA_MAKE_ID(be32_to_cpu(alternate_path->opa.slid));
3113 lap_msg->alt_remote_gid.global.interface_id
3114 = OPA_MAKE_ID(be32_to_cpu(alternate_path->opa.dlid));
3116 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
3117 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
3118 lap_msg->alt_hop_limit = alternate_path->hop_limit;
3119 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
3120 cm_lap_set_sl(lap_msg, alternate_path->sl);
3121 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
3122 cm_lap_set_local_ack_timeout(lap_msg,
3123 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
3124 alternate_path->packet_life_time));
3126 if (private_data && private_data_len)
3127 memcpy(lap_msg->private_data, private_data, private_data_len);
3130 int ib_send_cm_lap(struct ib_cm_id *cm_id,
3131 struct sa_path_rec *alternate_path,
3132 const void *private_data,
3133 u8 private_data_len)
3135 struct cm_id_private *cm_id_priv;
3136 struct ib_mad_send_buf *msg;
3137 unsigned long flags;
3140 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
3143 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3144 spin_lock_irqsave(&cm_id_priv->lock, flags);
3145 if (cm_id->state != IB_CM_ESTABLISHED ||
3146 (cm_id->lap_state != IB_CM_LAP_UNINIT &&
3147 cm_id->lap_state != IB_CM_LAP_IDLE)) {
3152 ret = cm_init_av_by_path(alternate_path, NULL, &cm_id_priv->alt_av,
3156 cm_id_priv->alt_av.timeout =
3157 cm_ack_timeout(cm_id_priv->target_ack_delay,
3158 cm_id_priv->alt_av.timeout - 1);
3160 ret = cm_alloc_msg(cm_id_priv, &msg);
3164 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
3165 alternate_path, private_data, private_data_len);
3166 msg->timeout_ms = cm_id_priv->timeout_ms;
3167 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
3169 ret = ib_post_send_mad(msg, NULL);
3171 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3176 cm_id->lap_state = IB_CM_LAP_SENT;
3177 cm_id_priv->msg = msg;
3179 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3182 EXPORT_SYMBOL(ib_send_cm_lap);
3184 static void cm_format_path_lid_from_lap(struct cm_lap_msg *lap_msg,
3185 struct sa_path_rec *path)
3189 if (path->rec_type != SA_PATH_REC_TYPE_OPA) {
3190 sa_path_set_dlid(path, ntohs(lap_msg->alt_local_lid));
3191 sa_path_set_slid(path, ntohs(lap_msg->alt_remote_lid));
3193 lid = opa_get_lid_from_gid(&lap_msg->alt_local_gid);
3194 sa_path_set_dlid(path, lid);
3196 lid = opa_get_lid_from_gid(&lap_msg->alt_remote_gid);
3197 sa_path_set_slid(path, lid);
3201 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
3202 struct sa_path_rec *path,
3203 struct cm_lap_msg *lap_msg)
3205 path->dgid = lap_msg->alt_local_gid;
3206 path->sgid = lap_msg->alt_remote_gid;
3207 path->flow_label = cm_lap_get_flow_label(lap_msg);
3208 path->hop_limit = lap_msg->alt_hop_limit;
3209 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
3210 path->reversible = 1;
3211 path->pkey = cm_id_priv->pkey;
3212 path->sl = cm_lap_get_sl(lap_msg);
3213 path->mtu_selector = IB_SA_EQ;
3214 path->mtu = cm_id_priv->path_mtu;
3215 path->rate_selector = IB_SA_EQ;
3216 path->rate = cm_lap_get_packet_rate(lap_msg);
3217 path->packet_life_time_selector = IB_SA_EQ;
3218 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
3219 path->packet_life_time -= (path->packet_life_time > 0);
3220 cm_format_path_lid_from_lap(lap_msg, path);
3223 static int cm_lap_handler(struct cm_work *work)
3225 struct cm_id_private *cm_id_priv;
3226 struct cm_lap_msg *lap_msg;
3227 struct ib_cm_lap_event_param *param;
3228 struct ib_mad_send_buf *msg = NULL;
3231 /* Currently Alternate path messages are not supported for
3234 if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3235 work->port->port_num))
3238 /* todo: verify LAP request and send reject APR if invalid. */
3239 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
3240 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
3241 lap_msg->local_comm_id);
3245 param = &work->cm_event.param.lap_rcvd;
3246 memset(&work->path[0], 0, sizeof(work->path[1]));
3247 cm_path_set_rec_type(work->port->cm_dev->ib_device,
3248 work->port->port_num,
3250 &lap_msg->alt_local_gid);
3251 param->alternate_path = &work->path[0];
3252 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
3253 work->cm_event.private_data = &lap_msg->private_data;
3255 spin_lock_irq(&cm_id_priv->lock);
3256 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
3259 switch (cm_id_priv->id.lap_state) {
3260 case IB_CM_LAP_UNINIT:
3261 case IB_CM_LAP_IDLE:
3263 case IB_CM_MRA_LAP_SENT:
3264 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3265 counter[CM_LAP_COUNTER]);
3266 msg = cm_alloc_response_msg_no_ah(work->port, work->mad_recv_wc);
3270 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
3271 CM_MSG_RESPONSE_OTHER,
3272 cm_id_priv->service_timeout,
3273 cm_id_priv->private_data,
3274 cm_id_priv->private_data_len);
3275 spin_unlock_irq(&cm_id_priv->lock);
3277 if (cm_create_response_msg_ah(work->port, work->mad_recv_wc, msg) ||
3278 ib_post_send_mad(msg, NULL))
3281 case IB_CM_LAP_RCVD:
3282 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3283 counter[CM_LAP_COUNTER]);
3289 ret = cm_init_av_for_lap(work->port, work->mad_recv_wc->wc,
3290 work->mad_recv_wc->recv_buf.grh,
3295 ret = cm_init_av_by_path(param->alternate_path, NULL,
3296 &cm_id_priv->alt_av, cm_id_priv);
3300 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
3301 cm_id_priv->tid = lap_msg->hdr.tid;
3302 ret = atomic_inc_and_test(&cm_id_priv->work_count);
3304 list_add_tail(&work->list, &cm_id_priv->work_list);
3305 spin_unlock_irq(&cm_id_priv->lock);
3308 cm_process_work(cm_id_priv, work);
3310 cm_deref_id(cm_id_priv);
3313 unlock: spin_unlock_irq(&cm_id_priv->lock);
3314 deref: cm_deref_id(cm_id_priv);
3318 static void cm_format_apr(struct cm_apr_msg *apr_msg,
3319 struct cm_id_private *cm_id_priv,
3320 enum ib_cm_apr_status status,
3323 const void *private_data,
3324 u8 private_data_len)
3326 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
3327 apr_msg->local_comm_id = cm_id_priv->id.local_id;
3328 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
3329 apr_msg->ap_status = (u8) status;
3331 if (info && info_length) {
3332 apr_msg->info_length = info_length;
3333 memcpy(apr_msg->info, info, info_length);
3336 if (private_data && private_data_len)
3337 memcpy(apr_msg->private_data, private_data, private_data_len);
3340 int ib_send_cm_apr(struct ib_cm_id *cm_id,
3341 enum ib_cm_apr_status status,
3344 const void *private_data,
3345 u8 private_data_len)
3347 struct cm_id_private *cm_id_priv;
3348 struct ib_mad_send_buf *msg;
3349 unsigned long flags;
3352 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
3353 (info && info_length > IB_CM_APR_INFO_LENGTH))
3356 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3357 spin_lock_irqsave(&cm_id_priv->lock, flags);
3358 if (cm_id->state != IB_CM_ESTABLISHED ||
3359 (cm_id->lap_state != IB_CM_LAP_RCVD &&
3360 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
3365 ret = cm_alloc_msg(cm_id_priv, &msg);
3369 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
3370 info, info_length, private_data, private_data_len);
3371 ret = ib_post_send_mad(msg, NULL);
3373 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3378 cm_id->lap_state = IB_CM_LAP_IDLE;
3379 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3382 EXPORT_SYMBOL(ib_send_cm_apr);
3384 static int cm_apr_handler(struct cm_work *work)
3386 struct cm_id_private *cm_id_priv;
3387 struct cm_apr_msg *apr_msg;
3390 /* Currently Alternate path messages are not supported for
3393 if (rdma_protocol_roce(work->port->cm_dev->ib_device,
3394 work->port->port_num))
3397 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
3398 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
3399 apr_msg->local_comm_id);
3401 return -EINVAL; /* Unmatched reply. */
3403 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
3404 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
3405 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
3406 work->cm_event.private_data = &apr_msg->private_data;
3408 spin_lock_irq(&cm_id_priv->lock);
3409 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
3410 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
3411 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
3412 spin_unlock_irq(&cm_id_priv->lock);
3415 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
3416 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3417 cm_id_priv->msg = NULL;
3419 ret = atomic_inc_and_test(&cm_id_priv->work_count);
3421 list_add_tail(&work->list, &cm_id_priv->work_list);
3422 spin_unlock_irq(&cm_id_priv->lock);
3425 cm_process_work(cm_id_priv, work);
3427 cm_deref_id(cm_id_priv);
3430 cm_deref_id(cm_id_priv);
3434 static int cm_timewait_handler(struct cm_work *work)
3436 struct cm_timewait_info *timewait_info;
3437 struct cm_id_private *cm_id_priv;
3440 timewait_info = (struct cm_timewait_info *)work;
3441 spin_lock_irq(&cm.lock);
3442 list_del(&timewait_info->list);
3443 spin_unlock_irq(&cm.lock);
3445 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
3446 timewait_info->work.remote_id);
3450 spin_lock_irq(&cm_id_priv->lock);
3451 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
3452 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
3453 spin_unlock_irq(&cm_id_priv->lock);
3456 cm_id_priv->id.state = IB_CM_IDLE;
3457 ret = atomic_inc_and_test(&cm_id_priv->work_count);
3459 list_add_tail(&work->list, &cm_id_priv->work_list);
3460 spin_unlock_irq(&cm_id_priv->lock);
3463 cm_process_work(cm_id_priv, work);
3465 cm_deref_id(cm_id_priv);
3468 cm_deref_id(cm_id_priv);
3472 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
3473 struct cm_id_private *cm_id_priv,
3474 struct ib_cm_sidr_req_param *param)
3476 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
3477 cm_form_tid(cm_id_priv));
3478 sidr_req_msg->request_id = cm_id_priv->id.local_id;
3479 sidr_req_msg->pkey = param->path->pkey;
3480 sidr_req_msg->service_id = param->service_id;
3482 if (param->private_data && param->private_data_len)
3483 memcpy(sidr_req_msg->private_data, param->private_data,
3484 param->private_data_len);
3487 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
3488 struct ib_cm_sidr_req_param *param)
3490 struct cm_id_private *cm_id_priv;
3491 struct ib_mad_send_buf *msg;
3492 unsigned long flags;
3495 if (!param->path || (param->private_data &&
3496 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
3499 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3500 ret = cm_init_av_by_path(param->path, param->sgid_attr,
3506 cm_id->service_id = param->service_id;
3507 cm_id->service_mask = ~cpu_to_be64(0);
3508 cm_id_priv->timeout_ms = param->timeout_ms;
3509 cm_id_priv->max_cm_retries = param->max_cm_retries;
3510 ret = cm_alloc_msg(cm_id_priv, &msg);
3514 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
3516 msg->timeout_ms = cm_id_priv->timeout_ms;
3517 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
3519 spin_lock_irqsave(&cm_id_priv->lock, flags);
3520 if (cm_id->state == IB_CM_IDLE)
3521 ret = ib_post_send_mad(msg, NULL);
3526 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3530 cm_id->state = IB_CM_SIDR_REQ_SENT;
3531 cm_id_priv->msg = msg;
3532 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3536 EXPORT_SYMBOL(ib_send_cm_sidr_req);
3538 static void cm_format_sidr_req_event(struct cm_work *work,
3539 const struct cm_id_private *rx_cm_id,
3540 struct ib_cm_id *listen_id)
3542 struct cm_sidr_req_msg *sidr_req_msg;
3543 struct ib_cm_sidr_req_event_param *param;
3545 sidr_req_msg = (struct cm_sidr_req_msg *)
3546 work->mad_recv_wc->recv_buf.mad;
3547 param = &work->cm_event.param.sidr_req_rcvd;
3548 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
3549 param->listen_id = listen_id;
3550 param->service_id = sidr_req_msg->service_id;
3551 param->bth_pkey = cm_get_bth_pkey(work);
3552 param->port = work->port->port_num;
3553 param->sgid_attr = rx_cm_id->av.ah_attr.grh.sgid_attr;
3554 work->cm_event.private_data = &sidr_req_msg->private_data;
3557 static int cm_sidr_req_handler(struct cm_work *work)
3559 struct ib_cm_id *cm_id;
3560 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
3561 struct cm_sidr_req_msg *sidr_req_msg;
3565 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
3567 return PTR_ERR(cm_id);
3568 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3570 /* Record SGID/SLID and request ID for lookup. */
3571 sidr_req_msg = (struct cm_sidr_req_msg *)
3572 work->mad_recv_wc->recv_buf.mad;
3573 wc = work->mad_recv_wc->wc;
3574 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
3575 cm_id_priv->av.dgid.global.interface_id = 0;
3576 ret = cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
3577 work->mad_recv_wc->recv_buf.grh,
3582 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
3583 cm_id_priv->tid = sidr_req_msg->hdr.tid;
3584 atomic_inc(&cm_id_priv->work_count);
3586 spin_lock_irq(&cm.lock);
3587 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3588 if (cur_cm_id_priv) {
3589 spin_unlock_irq(&cm.lock);
3590 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3591 counter[CM_SIDR_REQ_COUNTER]);
3592 goto out; /* Duplicate message. */
3594 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3595 cur_cm_id_priv = cm_find_listen(cm_id->device,
3596 sidr_req_msg->service_id);
3597 if (!cur_cm_id_priv) {
3598 spin_unlock_irq(&cm.lock);
3599 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED);
3600 goto out; /* No match. */
3602 atomic_inc(&cur_cm_id_priv->refcount);
3603 atomic_inc(&cm_id_priv->refcount);
3604 spin_unlock_irq(&cm.lock);
3606 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
3607 cm_id_priv->id.context = cur_cm_id_priv->id.context;
3608 cm_id_priv->id.service_id = sidr_req_msg->service_id;
3609 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3611 cm_format_sidr_req_event(work, cm_id_priv, &cur_cm_id_priv->id);
3612 cm_process_work(cm_id_priv, work);
3613 cm_deref_id(cur_cm_id_priv);
3616 ib_destroy_cm_id(&cm_id_priv->id);
3620 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3621 struct cm_id_private *cm_id_priv,
3622 struct ib_cm_sidr_rep_param *param)
3624 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3626 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
3627 sidr_rep_msg->status = param->status;
3628 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
3629 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
3630 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
3632 if (param->info && param->info_length)
3633 memcpy(sidr_rep_msg->info, param->info, param->info_length);
3635 if (param->private_data && param->private_data_len)
3636 memcpy(sidr_rep_msg->private_data, param->private_data,
3637 param->private_data_len);
3640 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3641 struct ib_cm_sidr_rep_param *param)
3643 struct cm_id_private *cm_id_priv;
3644 struct ib_mad_send_buf *msg;
3645 unsigned long flags;
3648 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3649 (param->private_data &&
3650 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3653 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3654 spin_lock_irqsave(&cm_id_priv->lock, flags);
3655 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
3660 ret = cm_alloc_msg(cm_id_priv, &msg);
3664 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3666 ret = ib_post_send_mad(msg, NULL);
3668 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3672 cm_id->state = IB_CM_IDLE;
3673 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3675 spin_lock_irqsave(&cm.lock, flags);
3676 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) {
3677 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3678 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
3680 spin_unlock_irqrestore(&cm.lock, flags);
3683 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3686 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3688 static void cm_format_sidr_rep_event(struct cm_work *work,
3689 const struct cm_id_private *cm_id_priv)
3691 struct cm_sidr_rep_msg *sidr_rep_msg;
3692 struct ib_cm_sidr_rep_event_param *param;
3694 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3695 work->mad_recv_wc->recv_buf.mad;
3696 param = &work->cm_event.param.sidr_rep_rcvd;
3697 param->status = sidr_rep_msg->status;
3698 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
3699 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
3700 param->info = &sidr_rep_msg->info;
3701 param->info_len = sidr_rep_msg->info_length;
3702 param->sgid_attr = cm_id_priv->av.ah_attr.grh.sgid_attr;
3703 work->cm_event.private_data = &sidr_rep_msg->private_data;
3706 static int cm_sidr_rep_handler(struct cm_work *work)
3708 struct cm_sidr_rep_msg *sidr_rep_msg;
3709 struct cm_id_private *cm_id_priv;
3711 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3712 work->mad_recv_wc->recv_buf.mad;
3713 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
3715 return -EINVAL; /* Unmatched reply. */
3717 spin_lock_irq(&cm_id_priv->lock);
3718 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3719 spin_unlock_irq(&cm_id_priv->lock);
3722 cm_id_priv->id.state = IB_CM_IDLE;
3723 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3724 spin_unlock_irq(&cm_id_priv->lock);
3726 cm_format_sidr_rep_event(work, cm_id_priv);
3727 cm_process_work(cm_id_priv, work);
3730 cm_deref_id(cm_id_priv);
3734 static void cm_process_send_error(struct ib_mad_send_buf *msg,
3735 enum ib_wc_status wc_status)
3737 struct cm_id_private *cm_id_priv;
3738 struct ib_cm_event cm_event;
3739 enum ib_cm_state state;
3742 memset(&cm_event, 0, sizeof cm_event);
3743 cm_id_priv = msg->context[0];
3745 /* Discard old sends or ones without a response. */
3746 spin_lock_irq(&cm_id_priv->lock);
3747 state = (enum ib_cm_state) (unsigned long) msg->context[1];
3748 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3751 pr_debug_ratelimited("CM: failed sending MAD in state %d. (%s)\n",
3752 state, ib_wc_status_msg(wc_status));
3754 case IB_CM_REQ_SENT:
3755 case IB_CM_MRA_REQ_RCVD:
3756 cm_reset_to_idle(cm_id_priv);
3757 cm_event.event = IB_CM_REQ_ERROR;
3759 case IB_CM_REP_SENT:
3760 case IB_CM_MRA_REP_RCVD:
3761 cm_reset_to_idle(cm_id_priv);
3762 cm_event.event = IB_CM_REP_ERROR;
3764 case IB_CM_DREQ_SENT:
3765 cm_enter_timewait(cm_id_priv);
3766 cm_event.event = IB_CM_DREQ_ERROR;
3768 case IB_CM_SIDR_REQ_SENT:
3769 cm_id_priv->id.state = IB_CM_IDLE;
3770 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3775 spin_unlock_irq(&cm_id_priv->lock);
3776 cm_event.param.send_status = wc_status;
3778 /* No other events can occur on the cm_id at this point. */
3779 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3782 ib_destroy_cm_id(&cm_id_priv->id);
3785 spin_unlock_irq(&cm_id_priv->lock);
3789 static void cm_send_handler(struct ib_mad_agent *mad_agent,
3790 struct ib_mad_send_wc *mad_send_wc)
3792 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3793 struct cm_port *port;
3796 port = mad_agent->context;
3797 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3798 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3801 * If the send was in response to a received message (context[0] is not
3802 * set to a cm_id), and is not a REJ, then it is a send that was
3805 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3808 atomic_long_add(1 + msg->retries,
3809 &port->counter_group[CM_XMIT].counter[attr_index]);
3811 atomic_long_add(msg->retries,
3812 &port->counter_group[CM_XMIT_RETRIES].
3813 counter[attr_index]);
3815 switch (mad_send_wc->status) {
3817 case IB_WC_WR_FLUSH_ERR:
3821 if (msg->context[0] && msg->context[1])
3822 cm_process_send_error(msg, mad_send_wc->status);
3829 static void cm_work_handler(struct work_struct *_work)
3831 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3834 switch (work->cm_event.event) {
3835 case IB_CM_REQ_RECEIVED:
3836 ret = cm_req_handler(work);
3838 case IB_CM_MRA_RECEIVED:
3839 ret = cm_mra_handler(work);
3841 case IB_CM_REJ_RECEIVED:
3842 ret = cm_rej_handler(work);
3844 case IB_CM_REP_RECEIVED:
3845 ret = cm_rep_handler(work);
3847 case IB_CM_RTU_RECEIVED:
3848 ret = cm_rtu_handler(work);
3850 case IB_CM_USER_ESTABLISHED:
3851 ret = cm_establish_handler(work);
3853 case IB_CM_DREQ_RECEIVED:
3854 ret = cm_dreq_handler(work);
3856 case IB_CM_DREP_RECEIVED:
3857 ret = cm_drep_handler(work);
3859 case IB_CM_SIDR_REQ_RECEIVED:
3860 ret = cm_sidr_req_handler(work);
3862 case IB_CM_SIDR_REP_RECEIVED:
3863 ret = cm_sidr_rep_handler(work);
3865 case IB_CM_LAP_RECEIVED:
3866 ret = cm_lap_handler(work);
3868 case IB_CM_APR_RECEIVED:
3869 ret = cm_apr_handler(work);
3871 case IB_CM_TIMEWAIT_EXIT:
3872 ret = cm_timewait_handler(work);
3875 pr_debug("cm_event.event: 0x%x\n", work->cm_event.event);
3883 static int cm_establish(struct ib_cm_id *cm_id)
3885 struct cm_id_private *cm_id_priv;
3886 struct cm_work *work;
3887 unsigned long flags;
3889 struct cm_device *cm_dev;
3891 cm_dev = ib_get_client_data(cm_id->device, &cm_client);
3895 work = kmalloc(sizeof *work, GFP_ATOMIC);
3899 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3900 spin_lock_irqsave(&cm_id_priv->lock, flags);
3901 switch (cm_id->state)
3903 case IB_CM_REP_SENT:
3904 case IB_CM_MRA_REP_RCVD:
3905 cm_id->state = IB_CM_ESTABLISHED;
3907 case IB_CM_ESTABLISHED:
3911 pr_debug("%s: local_id %d, cm_id->state: %d\n", __func__,
3912 be32_to_cpu(cm_id->local_id), cm_id->state);
3916 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3924 * The CM worker thread may try to destroy the cm_id before it
3925 * can execute this work item. To prevent potential deadlock,
3926 * we need to find the cm_id once we're in the context of the
3927 * worker thread, rather than holding a reference on it.
3929 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3930 work->local_id = cm_id->local_id;
3931 work->remote_id = cm_id->remote_id;
3932 work->mad_recv_wc = NULL;
3933 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3935 /* Check if the device started its remove_one */
3936 spin_lock_irqsave(&cm.lock, flags);
3937 if (!cm_dev->going_down) {
3938 queue_delayed_work(cm.wq, &work->work, 0);
3943 spin_unlock_irqrestore(&cm.lock, flags);
3949 static int cm_migrate(struct ib_cm_id *cm_id)
3951 struct cm_id_private *cm_id_priv;
3952 struct cm_av tmp_av;
3953 unsigned long flags;
3954 int tmp_send_port_not_ready;
3957 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3958 spin_lock_irqsave(&cm_id_priv->lock, flags);
3959 if (cm_id->state == IB_CM_ESTABLISHED &&
3960 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3961 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3962 cm_id->lap_state = IB_CM_LAP_IDLE;
3963 /* Swap address vector */
3964 tmp_av = cm_id_priv->av;
3965 cm_id_priv->av = cm_id_priv->alt_av;
3966 cm_id_priv->alt_av = tmp_av;
3967 /* Swap port send ready state */
3968 tmp_send_port_not_ready = cm_id_priv->prim_send_port_not_ready;
3969 cm_id_priv->prim_send_port_not_ready = cm_id_priv->altr_send_port_not_ready;
3970 cm_id_priv->altr_send_port_not_ready = tmp_send_port_not_ready;
3973 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3978 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3983 case IB_EVENT_COMM_EST:
3984 ret = cm_establish(cm_id);
3986 case IB_EVENT_PATH_MIG:
3987 ret = cm_migrate(cm_id);
3994 EXPORT_SYMBOL(ib_cm_notify);
3996 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3997 struct ib_mad_send_buf *send_buf,
3998 struct ib_mad_recv_wc *mad_recv_wc)
4000 struct cm_port *port = mad_agent->context;
4001 struct cm_work *work;
4002 enum ib_cm_event_type event;
4003 bool alt_path = false;
4008 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
4009 case CM_REQ_ATTR_ID:
4010 alt_path = cm_req_has_alt_path((struct cm_req_msg *)
4011 mad_recv_wc->recv_buf.mad);
4012 paths = 1 + (alt_path != 0);
4013 event = IB_CM_REQ_RECEIVED;
4015 case CM_MRA_ATTR_ID:
4016 event = IB_CM_MRA_RECEIVED;
4018 case CM_REJ_ATTR_ID:
4019 event = IB_CM_REJ_RECEIVED;
4021 case CM_REP_ATTR_ID:
4022 event = IB_CM_REP_RECEIVED;
4024 case CM_RTU_ATTR_ID:
4025 event = IB_CM_RTU_RECEIVED;
4027 case CM_DREQ_ATTR_ID:
4028 event = IB_CM_DREQ_RECEIVED;
4030 case CM_DREP_ATTR_ID:
4031 event = IB_CM_DREP_RECEIVED;
4033 case CM_SIDR_REQ_ATTR_ID:
4034 event = IB_CM_SIDR_REQ_RECEIVED;
4036 case CM_SIDR_REP_ATTR_ID:
4037 event = IB_CM_SIDR_REP_RECEIVED;
4039 case CM_LAP_ATTR_ID:
4041 event = IB_CM_LAP_RECEIVED;
4043 case CM_APR_ATTR_ID:
4044 event = IB_CM_APR_RECEIVED;
4047 ib_free_recv_mad(mad_recv_wc);
4051 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
4052 atomic_long_inc(&port->counter_group[CM_RECV].
4053 counter[attr_id - CM_ATTR_ID_OFFSET]);
4055 work = kmalloc(sizeof(*work) + sizeof(struct sa_path_rec) * paths,
4058 ib_free_recv_mad(mad_recv_wc);
4062 INIT_DELAYED_WORK(&work->work, cm_work_handler);
4063 work->cm_event.event = event;
4064 work->mad_recv_wc = mad_recv_wc;
4067 /* Check if the device started its remove_one */
4068 spin_lock_irq(&cm.lock);
4069 if (!port->cm_dev->going_down)
4070 queue_delayed_work(cm.wq, &work->work, 0);
4073 spin_unlock_irq(&cm.lock);
4077 ib_free_recv_mad(mad_recv_wc);
4081 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
4082 struct ib_qp_attr *qp_attr,
4085 unsigned long flags;
4088 spin_lock_irqsave(&cm_id_priv->lock, flags);
4089 switch (cm_id_priv->id.state) {
4090 case IB_CM_REQ_SENT:
4091 case IB_CM_MRA_REQ_RCVD:
4092 case IB_CM_REQ_RCVD:
4093 case IB_CM_MRA_REQ_SENT:
4094 case IB_CM_REP_RCVD:
4095 case IB_CM_MRA_REP_SENT:
4096 case IB_CM_REP_SENT:
4097 case IB_CM_MRA_REP_RCVD:
4098 case IB_CM_ESTABLISHED:
4099 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
4100 IB_QP_PKEY_INDEX | IB_QP_PORT;
4101 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
4102 if (cm_id_priv->responder_resources)
4103 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
4104 IB_ACCESS_REMOTE_ATOMIC;
4105 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
4106 qp_attr->port_num = cm_id_priv->av.port->port_num;
4110 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
4111 __func__, be32_to_cpu(cm_id_priv->id.local_id),
4112 cm_id_priv->id.state);
4116 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4120 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
4121 struct ib_qp_attr *qp_attr,
4124 unsigned long flags;
4127 spin_lock_irqsave(&cm_id_priv->lock, flags);
4128 switch (cm_id_priv->id.state) {
4129 case IB_CM_REQ_RCVD:
4130 case IB_CM_MRA_REQ_SENT:
4131 case IB_CM_REP_RCVD:
4132 case IB_CM_MRA_REP_SENT:
4133 case IB_CM_REP_SENT:
4134 case IB_CM_MRA_REP_RCVD:
4135 case IB_CM_ESTABLISHED:
4136 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
4137 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
4138 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
4139 qp_attr->path_mtu = cm_id_priv->path_mtu;
4140 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
4141 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
4142 if (cm_id_priv->qp_type == IB_QPT_RC ||
4143 cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
4144 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
4145 IB_QP_MIN_RNR_TIMER;
4146 qp_attr->max_dest_rd_atomic =
4147 cm_id_priv->responder_resources;
4148 qp_attr->min_rnr_timer = 0;
4150 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) {
4151 *qp_attr_mask |= IB_QP_ALT_PATH;
4152 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4153 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4154 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4155 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4160 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
4161 __func__, be32_to_cpu(cm_id_priv->id.local_id),
4162 cm_id_priv->id.state);
4166 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4170 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
4171 struct ib_qp_attr *qp_attr,
4174 unsigned long flags;
4177 spin_lock_irqsave(&cm_id_priv->lock, flags);
4178 switch (cm_id_priv->id.state) {
4179 /* Allow transition to RTS before sending REP */
4180 case IB_CM_REQ_RCVD:
4181 case IB_CM_MRA_REQ_SENT:
4183 case IB_CM_REP_RCVD:
4184 case IB_CM_MRA_REP_SENT:
4185 case IB_CM_REP_SENT:
4186 case IB_CM_MRA_REP_RCVD:
4187 case IB_CM_ESTABLISHED:
4188 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
4189 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
4190 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
4191 switch (cm_id_priv->qp_type) {
4193 case IB_QPT_XRC_INI:
4194 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
4195 IB_QP_MAX_QP_RD_ATOMIC;
4196 qp_attr->retry_cnt = cm_id_priv->retry_count;
4197 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
4198 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
4200 case IB_QPT_XRC_TGT:
4201 *qp_attr_mask |= IB_QP_TIMEOUT;
4202 qp_attr->timeout = cm_id_priv->av.timeout;
4207 if (rdma_ah_get_dlid(&cm_id_priv->alt_av.ah_attr)) {
4208 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
4209 qp_attr->path_mig_state = IB_MIG_REARM;
4212 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
4213 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
4214 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
4215 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
4216 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
4217 qp_attr->path_mig_state = IB_MIG_REARM;
4222 pr_debug("%s: local_id %d, cm_id_priv->id.state: %d\n",
4223 __func__, be32_to_cpu(cm_id_priv->id.local_id),
4224 cm_id_priv->id.state);
4228 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
4232 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
4233 struct ib_qp_attr *qp_attr,
4236 struct cm_id_private *cm_id_priv;
4239 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
4240 switch (qp_attr->qp_state) {
4242 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
4245 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
4248 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
4256 EXPORT_SYMBOL(ib_cm_init_qp_attr);
4258 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
4261 struct cm_counter_group *group;
4262 struct cm_counter_attribute *cm_attr;
4264 group = container_of(obj, struct cm_counter_group, obj);
4265 cm_attr = container_of(attr, struct cm_counter_attribute, attr);
4267 return sprintf(buf, "%ld\n",
4268 atomic_long_read(&group->counter[cm_attr->index]));
4271 static const struct sysfs_ops cm_counter_ops = {
4272 .show = cm_show_counter
4275 static struct kobj_type cm_counter_obj_type = {
4276 .sysfs_ops = &cm_counter_ops,
4277 .default_attrs = cm_counter_default_attrs
4280 static void cm_release_port_obj(struct kobject *obj)
4282 struct cm_port *cm_port;
4284 cm_port = container_of(obj, struct cm_port, port_obj);
4288 static struct kobj_type cm_port_obj_type = {
4289 .release = cm_release_port_obj
4292 static char *cm_devnode(struct device *dev, umode_t *mode)
4296 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
4299 struct class cm_class = {
4300 .owner = THIS_MODULE,
4301 .name = "infiniband_cm",
4302 .devnode = cm_devnode,
4304 EXPORT_SYMBOL(cm_class);
4306 static int cm_create_port_fs(struct cm_port *port)
4310 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type,
4311 &port->cm_dev->device->kobj,
4312 "%d", port->port_num);
4318 for (i = 0; i < CM_COUNTER_GROUPS; i++) {
4319 ret = kobject_init_and_add(&port->counter_group[i].obj,
4320 &cm_counter_obj_type,
4322 "%s", counter_group_names[i]);
4331 kobject_put(&port->counter_group[i].obj);
4332 kobject_put(&port->port_obj);
4337 static void cm_remove_port_fs(struct cm_port *port)
4341 for (i = 0; i < CM_COUNTER_GROUPS; i++)
4342 kobject_put(&port->counter_group[i].obj);
4344 kobject_put(&port->port_obj);
4347 static void cm_add_one(struct ib_device *ib_device)
4349 struct cm_device *cm_dev;
4350 struct cm_port *port;
4351 struct ib_mad_reg_req reg_req = {
4352 .mgmt_class = IB_MGMT_CLASS_CM,
4353 .mgmt_class_version = IB_CM_CLASS_VERSION,
4355 struct ib_port_modify port_modify = {
4356 .set_port_cap_mask = IB_PORT_CM_SUP
4358 unsigned long flags;
4363 cm_dev = kzalloc(struct_size(cm_dev, port, ib_device->phys_port_cnt),
4368 cm_dev->ib_device = ib_device;
4369 cm_dev->ack_delay = ib_device->attrs.local_ca_ack_delay;
4370 cm_dev->going_down = 0;
4371 cm_dev->device = device_create(&cm_class, &ib_device->dev,
4373 "%s", dev_name(&ib_device->dev));
4374 if (IS_ERR(cm_dev->device)) {
4379 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
4380 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
4381 if (!rdma_cap_ib_cm(ib_device, i))
4384 port = kzalloc(sizeof *port, GFP_KERNEL);
4388 cm_dev->port[i-1] = port;
4389 port->cm_dev = cm_dev;
4392 INIT_LIST_HEAD(&port->cm_priv_prim_list);
4393 INIT_LIST_HEAD(&port->cm_priv_altr_list);
4395 ret = cm_create_port_fs(port);
4399 port->mad_agent = ib_register_mad_agent(ib_device, i,
4407 if (IS_ERR(port->mad_agent))
4410 ret = ib_modify_port(ib_device, i, 0, &port_modify);
4420 ib_set_client_data(ib_device, &cm_client, cm_dev);
4422 write_lock_irqsave(&cm.device_lock, flags);
4423 list_add_tail(&cm_dev->list, &cm.device_list);
4424 write_unlock_irqrestore(&cm.device_lock, flags);
4428 ib_unregister_mad_agent(port->mad_agent);
4430 cm_remove_port_fs(port);
4432 port_modify.set_port_cap_mask = 0;
4433 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
4435 if (!rdma_cap_ib_cm(ib_device, i))
4438 port = cm_dev->port[i-1];
4439 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4440 ib_unregister_mad_agent(port->mad_agent);
4441 cm_remove_port_fs(port);
4444 device_unregister(cm_dev->device);
4448 static void cm_remove_one(struct ib_device *ib_device, void *client_data)
4450 struct cm_device *cm_dev = client_data;
4451 struct cm_port *port;
4452 struct cm_id_private *cm_id_priv;
4453 struct ib_mad_agent *cur_mad_agent;
4454 struct ib_port_modify port_modify = {
4455 .clr_port_cap_mask = IB_PORT_CM_SUP
4457 unsigned long flags;
4463 write_lock_irqsave(&cm.device_lock, flags);
4464 list_del(&cm_dev->list);
4465 write_unlock_irqrestore(&cm.device_lock, flags);
4467 spin_lock_irq(&cm.lock);
4468 cm_dev->going_down = 1;
4469 spin_unlock_irq(&cm.lock);
4471 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
4472 if (!rdma_cap_ib_cm(ib_device, i))
4475 port = cm_dev->port[i-1];
4476 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
4477 /* Mark all the cm_id's as not valid */
4478 spin_lock_irq(&cm.lock);
4479 list_for_each_entry(cm_id_priv, &port->cm_priv_altr_list, altr_list)
4480 cm_id_priv->altr_send_port_not_ready = 1;
4481 list_for_each_entry(cm_id_priv, &port->cm_priv_prim_list, prim_list)
4482 cm_id_priv->prim_send_port_not_ready = 1;
4483 spin_unlock_irq(&cm.lock);
4485 * We flush the queue here after the going_down set, this
4486 * verify that no new works will be queued in the recv handler,
4487 * after that we can call the unregister_mad_agent
4489 flush_workqueue(cm.wq);
4490 spin_lock_irq(&cm.state_lock);
4491 cur_mad_agent = port->mad_agent;
4492 port->mad_agent = NULL;
4493 spin_unlock_irq(&cm.state_lock);
4494 ib_unregister_mad_agent(cur_mad_agent);
4495 cm_remove_port_fs(port);
4498 device_unregister(cm_dev->device);
4502 static int __init ib_cm_init(void)
4506 memset(&cm, 0, sizeof cm);
4507 INIT_LIST_HEAD(&cm.device_list);
4508 rwlock_init(&cm.device_lock);
4509 spin_lock_init(&cm.lock);
4510 spin_lock_init(&cm.state_lock);
4511 cm.listen_service_table = RB_ROOT;
4512 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
4513 cm.remote_id_table = RB_ROOT;
4514 cm.remote_qp_table = RB_ROOT;
4515 cm.remote_sidr_table = RB_ROOT;
4516 idr_init(&cm.local_id_table);
4517 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
4518 INIT_LIST_HEAD(&cm.timewait_list);
4520 ret = class_register(&cm_class);
4526 cm.wq = alloc_workqueue("ib_cm", 0, 1);
4532 ret = ib_register_client(&cm_client);
4538 destroy_workqueue(cm.wq);
4540 class_unregister(&cm_class);
4542 idr_destroy(&cm.local_id_table);
4546 static void __exit ib_cm_cleanup(void)
4548 struct cm_timewait_info *timewait_info, *tmp;
4550 spin_lock_irq(&cm.lock);
4551 list_for_each_entry(timewait_info, &cm.timewait_list, list)
4552 cancel_delayed_work(&timewait_info->work.work);
4553 spin_unlock_irq(&cm.lock);
4555 ib_unregister_client(&cm_client);
4556 destroy_workqueue(cm.wq);
4558 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
4559 list_del(&timewait_info->list);
4560 kfree(timewait_info);
4563 class_unregister(&cm_class);
4564 idr_destroy(&cm.local_id_table);
4567 module_init(ib_cm_init);
4568 module_exit(ib_cm_cleanup);