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IPoIB/cm: Fix performance regression on Mellanox
[deliverable/linux.git] / drivers / infiniband / core / cm.c
CommitLineData
a977049d 1/*
f06d2653 2 * Copyright (c) 2004-2006 Intel Corporation. All rights reserved.
a977049d
HR		 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.
6 *
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:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
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.
25 *
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
33 * SOFTWARE.
34 *
6e61d04f 35 * $Id: cm.c 4311 2005-12-05 18:42:01Z sean.hefty $
a977049d 36 */
1b52fa98
SH		 37
38#include <linux/completion.h>
a977049d
HR		 39#include <linux/dma-mapping.h>
40#include <linux/err.h>
41#include <linux/idr.h>
42#include <linux/interrupt.h>
f06d2653 43#include <linux/random.h>
a977049d
HR		 44#include <linux/rbtree.h>
45#include <linux/spinlock.h>
46#include <linux/workqueue.h>
47
a4d61e84
RD		 48#include <rdma/ib_cache.h>
49#include <rdma/ib_cm.h>
a977049d
HR		 50#include "cm_msgs.h"
51
52MODULE_AUTHOR("Sean Hefty");
53MODULE_DESCRIPTION("InfiniBand CM");
54MODULE_LICENSE("Dual BSD/GPL");
55
56static void cm_add_one(struct ib_device *device);
57static void cm_remove_one(struct ib_device *device);
58
59static struct ib_client cm_client = {
60 .name = "cm",
61 .add = cm_add_one,
62 .remove = cm_remove_one
63};
64
65static struct ib_cm {
66 spinlock_t lock;
67 struct list_head device_list;
68 rwlock_t device_lock;
69 struct rb_root listen_service_table;
70 u64 listen_service_id;
71 /* struct rb_root peer_service_table; todo: fix peer to peer */
72 struct rb_root remote_qp_table;
73 struct rb_root remote_id_table;
74 struct rb_root remote_sidr_table;
75 struct idr local_id_table;
f06d2653 76 __be32 random_id_operand;
8575329d 77 struct list_head timewait_list;
a977049d
HR		 78 struct workqueue_struct *wq;
79} cm;
80
81struct cm_port {
82 struct cm_device *cm_dev;
83 struct ib_mad_agent *mad_agent;
84 u8 port_num;
85};
86
87struct cm_device {
88 struct list_head list;
89 struct ib_device *device;
a977049d
HR		 90 struct cm_port port[0];
91};
92
93struct cm_av {
94 struct cm_port *port;
95 union ib_gid dgid;
96 struct ib_ah_attr ah_attr;
97 u16 pkey_index;
98 u8 packet_life_time;
99};
100
101struct cm_work {
c4028958 102 struct delayed_work work;
a977049d
HR		 103 struct list_head list;
104 struct cm_port *port;
105 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
97f52eb4
SH		 106 __be32 local_id; /* Established / timewait */
107 __be32 remote_id;
a977049d
HR		 108 struct ib_cm_event cm_event;
109 struct ib_sa_path_rec path[0];
110};
111
112struct cm_timewait_info {
113 struct cm_work work; /* Must be first. */
8575329d 114 struct list_head list;
a977049d
HR		 115 struct rb_node remote_qp_node;
116 struct rb_node remote_id_node;
97f52eb4
SH		 117 __be64 remote_ca_guid;
118 __be32 remote_qpn;
a977049d
HR		 119 u8 inserted_remote_qp;
120 u8 inserted_remote_id;
121};
122
123struct cm_id_private {
124 struct ib_cm_id id;
125
126 struct rb_node service_node;
127 struct rb_node sidr_id_node;
87fd1a11 128 spinlock_t lock; /* Do not acquire inside cm.lock */
1b52fa98 129 struct completion comp;
a977049d
HR		 130 atomic_t refcount;
131
132 struct ib_mad_send_buf *msg;
133 struct cm_timewait_info *timewait_info;
134 /* todo: use alternate port on send failure */
135 struct cm_av av;
136 struct cm_av alt_av;
6e61d04f 137 struct ib_cm_compare_data *compare_data;
a977049d
HR		 138
139 void *private_data;
97f52eb4
SH		 140 __be64 tid;
141 __be32 local_qpn;
142 __be32 remote_qpn;
ae7971a7 143 enum ib_qp_type qp_type;
97f52eb4
SH		 144 __be32 sq_psn;
145 __be32 rq_psn;
a977049d
HR		 146 int timeout_ms;
147 enum ib_mtu path_mtu;
e1444b5a 148 __be16 pkey;
a977049d
HR		 149 u8 private_data_len;
150 u8 max_cm_retries;
151 u8 peer_to_peer;
152 u8 responder_resources;
153 u8 initiator_depth;
a977049d
HR		 154 u8 retry_count;
155 u8 rnr_retry_count;
156 u8 service_timeout;
157
158 struct list_head work_list;
159 atomic_t work_count;
160};
161
c4028958 162static void cm_work_handler(struct work_struct *work);
a977049d
HR		 163
164static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
165{
166 if (atomic_dec_and_test(&cm_id_priv->refcount))
1b52fa98 167 complete(&cm_id_priv->comp);
a977049d
HR		 168}
169
170static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
171 struct ib_mad_send_buf **msg)
172{
173 struct ib_mad_agent *mad_agent;
174 struct ib_mad_send_buf *m;
175 struct ib_ah *ah;
176
177 mad_agent = cm_id_priv->av.port->mad_agent;
178 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
179 if (IS_ERR(ah))
180 return PTR_ERR(ah);
181
3cd96564 182 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
354ba39c 183 cm_id_priv->av.pkey_index,
34816ad9 184 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
a977049d
HR		 185 GFP_ATOMIC);
186 if (IS_ERR(m)) {
187 ib_destroy_ah(ah);
188 return PTR_ERR(m);
189 }
190
191 /* Timeout set by caller if response is expected. */
34816ad9
SH		 192 m->ah = ah;
193 m->retries = cm_id_priv->max_cm_retries;
a977049d
HR		 194
195 atomic_inc(&cm_id_priv->refcount);
196 m->context[0] = cm_id_priv;
197 *msg = m;
198 return 0;
199}
200
201static int cm_alloc_response_msg(struct cm_port *port,
202 struct ib_mad_recv_wc *mad_recv_wc,
203 struct ib_mad_send_buf **msg)
204{
205 struct ib_mad_send_buf *m;
206 struct ib_ah *ah;
207
208 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
209 mad_recv_wc->recv_buf.grh, port->port_num);
210 if (IS_ERR(ah))
211 return PTR_ERR(ah);
212
213 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
34816ad9 214 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
a977049d
HR		 215 GFP_ATOMIC);
216 if (IS_ERR(m)) {
217 ib_destroy_ah(ah);
218 return PTR_ERR(m);
219 }
34816ad9 220 m->ah = ah;
a977049d
HR		 221 *msg = m;
222 return 0;
223}
224
225static void cm_free_msg(struct ib_mad_send_buf *msg)
226{
34816ad9 227 ib_destroy_ah(msg->ah);
a977049d
HR		 228 if (msg->context[0])
229 cm_deref_id(msg->context[0]);
230 ib_free_send_mad(msg);
231}
232
233static void * cm_copy_private_data(const void *private_data,
234 u8 private_data_len)
235{
236 void *data;
237
238 if (!private_data || !private_data_len)
239 return NULL;
240
bed8bdfd 241 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
a977049d
HR		 242 if (!data)
243 return ERR_PTR(-ENOMEM);
244
a977049d
HR		 245 return data;
246}
247
248static void cm_set_private_data(struct cm_id_private *cm_id_priv,
249 void *private_data, u8 private_data_len)
250{
251 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
252 kfree(cm_id_priv->private_data);
253
254 cm_id_priv->private_data = private_data;
255 cm_id_priv->private_data_len = private_data_len;
256}
257
ca222c6b
SH		 258static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
259 struct ib_grh *grh, struct cm_av *av)
a977049d
HR		 260{
261 av->port = port;
262 av->pkey_index = wc->pkey_index;
ca222c6b
SH		 263 ib_init_ah_from_wc(port->cm_dev->device, port->port_num, wc,
264 grh, &av->ah_attr);
a977049d
HR		 265}
266
267static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
268{
269 struct cm_device *cm_dev;
270 struct cm_port *port = NULL;
271 unsigned long flags;
272 int ret;
273 u8 p;
274
275 read_lock_irqsave(&cm.device_lock, flags);
276 list_for_each_entry(cm_dev, &cm.device_list, list) {
277 if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
278 &p, NULL)) {
279 port = &cm_dev->port[p-1];
280 break;
281 }
282 }
283 read_unlock_irqrestore(&cm.device_lock, flags);
284
285 if (!port)
286 return -EINVAL;
287
288 ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
289 be16_to_cpu(path->pkey), &av->pkey_index);
290 if (ret)
291 return ret;
292
293 av->port = port;
ca222c6b
SH		 294 ib_init_ah_from_path(cm_dev->device, port->port_num, path,
295 &av->ah_attr);
a977049d
HR		 296 av->packet_life_time = path->packet_life_time;
297 return 0;
298}
299
300static int cm_alloc_id(struct cm_id_private *cm_id_priv)
301{
302 unsigned long flags;
f06d2653 303 int ret, id;
de1bb1a6 304 static int next_id;
a977049d
HR		 305
306 do {
307 spin_lock_irqsave(&cm.lock, flags);
f06d2653 308 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv,
9f81036c
MT		 309 next_id, &id);
310 if (!ret)
311 next_id = ((unsigned) id + 1) & MAX_ID_MASK;
a977049d
HR		 312 spin_unlock_irqrestore(&cm.lock, flags);
313 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
f06d2653
SH		 314
315 cm_id_priv->id.local_id = (__force __be32) (id ^ cm.random_id_operand);
a977049d
HR		 316 return ret;
317}
318
97f52eb4 319static void cm_free_id(__be32 local_id)
a977049d
HR		 320{
321 unsigned long flags;
322
323 spin_lock_irqsave(&cm.lock, flags);
f06d2653
SH		 324 idr_remove(&cm.local_id_table,
325 (__force int) (local_id ^ cm.random_id_operand));
a977049d
HR		 326 spin_unlock_irqrestore(&cm.lock, flags);
327}
328
97f52eb4 329static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
a977049d
HR		 330{
331 struct cm_id_private *cm_id_priv;
332
f06d2653
SH		 333 cm_id_priv = idr_find(&cm.local_id_table,
334 (__force int) (local_id ^ cm.random_id_operand));
a977049d
HR		 335 if (cm_id_priv) {
336 if (cm_id_priv->id.remote_id == remote_id)
337 atomic_inc(&cm_id_priv->refcount);
338 else
339 cm_id_priv = NULL;
340 }
341
342 return cm_id_priv;
343}
344
97f52eb4 345static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
a977049d
HR		 346{
347 struct cm_id_private *cm_id_priv;
348 unsigned long flags;
349
350 spin_lock_irqsave(&cm.lock, flags);
351 cm_id_priv = cm_get_id(local_id, remote_id);
352 spin_unlock_irqrestore(&cm.lock, flags);
353
354 return cm_id_priv;
355}
356
6e61d04f
SH		 357static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
358{
359 int i;
360
361 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
362 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
363 ((unsigned long *) mask)[i];
364}
365
366static int cm_compare_data(struct ib_cm_compare_data *src_data,
367 struct ib_cm_compare_data *dst_data)
368{
369 u8 src[IB_CM_COMPARE_SIZE];
370 u8 dst[IB_CM_COMPARE_SIZE];
371
372 if (!src_data || !dst_data)
373 return 0;
374
375 cm_mask_copy(src, src_data->data, dst_data->mask);
376 cm_mask_copy(dst, dst_data->data, src_data->mask);
377 return memcmp(src, dst, IB_CM_COMPARE_SIZE);
378}
379
380static int cm_compare_private_data(u8 *private_data,
381 struct ib_cm_compare_data *dst_data)
382{
383 u8 src[IB_CM_COMPARE_SIZE];
384
385 if (!dst_data)
386 return 0;
387
388 cm_mask_copy(src, private_data, dst_data->mask);
389 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
390}
391
a977049d
HR		 392static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
393{
394 struct rb_node **link = &cm.listen_service_table.rb_node;
395 struct rb_node *parent = NULL;
396 struct cm_id_private *cur_cm_id_priv;
97f52eb4
SH		 397 __be64 service_id = cm_id_priv->id.service_id;
398 __be64 service_mask = cm_id_priv->id.service_mask;
6e61d04f 399 int data_cmp;
a977049d
HR		 400
401 while (*link) {
402 parent = *link;
403 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
404 service_node);
6e61d04f
SH		 405 data_cmp = cm_compare_data(cm_id_priv->compare_data,
406 cur_cm_id_priv->compare_data);
a977049d 407 if ((cur_cm_id_priv->id.service_mask & service_id) ==
07d357d0 408 (service_mask & cur_cm_id_priv->id.service_id) &&
6e61d04f
SH		 409 (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
410 !data_cmp)
07d357d0
SH		 411 return cur_cm_id_priv;
412
413 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
414 link = &(*link)->rb_left;
415 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
416 link = &(*link)->rb_right;
417 else if (service_id < cur_cm_id_priv->id.service_id)
a977049d 418 link = &(*link)->rb_left;
6e61d04f
SH		 419 else if (service_id > cur_cm_id_priv->id.service_id)
420 link = &(*link)->rb_right;
421 else if (data_cmp < 0)
422 link = &(*link)->rb_left;
a977049d
HR		 423 else
424 link = &(*link)->rb_right;
425 }
426 rb_link_node(&cm_id_priv->service_node, parent, link);
427 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
428 return NULL;
429}
430
07d357d0 431static struct cm_id_private * cm_find_listen(struct ib_device *device,
6e61d04f
SH		 432 __be64 service_id,
433 u8 *private_data)
a977049d
HR		 434{
435 struct rb_node *node = cm.listen_service_table.rb_node;
436 struct cm_id_private *cm_id_priv;
6e61d04f 437 int data_cmp;
a977049d
HR		 438
439 while (node) {
440 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
6e61d04f
SH		 441 data_cmp = cm_compare_private_data(private_data,
442 cm_id_priv->compare_data);
a977049d 443 if ((cm_id_priv->id.service_mask & service_id) ==
07d357d0 444 cm_id_priv->id.service_id &&
6e61d04f 445 (cm_id_priv->id.device == device) && !data_cmp)
a977049d 446 return cm_id_priv;
07d357d0
SH		 447
448 if (device < cm_id_priv->id.device)
449 node = node->rb_left;
450 else if (device > cm_id_priv->id.device)
451 node = node->rb_right;
452 else if (service_id < cm_id_priv->id.service_id)
a977049d 453 node = node->rb_left;
6e61d04f
SH		 454 else if (service_id > cm_id_priv->id.service_id)
455 node = node->rb_right;
456 else if (data_cmp < 0)
457 node = node->rb_left;
a977049d
HR		 458 else
459 node = node->rb_right;
460 }
461 return NULL;
462}
463
464static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
465 *timewait_info)
466{
467 struct rb_node **link = &cm.remote_id_table.rb_node;
468 struct rb_node *parent = NULL;
469 struct cm_timewait_info *cur_timewait_info;
97f52eb4
SH		 470 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
471 __be32 remote_id = timewait_info->work.remote_id;
a977049d
HR		 472
473 while (*link) {
474 parent = *link;
475 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
476 remote_id_node);
477 if (remote_id < cur_timewait_info->work.remote_id)
478 link = &(*link)->rb_left;
479 else if (remote_id > cur_timewait_info->work.remote_id)
480 link = &(*link)->rb_right;
481 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
482 link = &(*link)->rb_left;
483 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
484 link = &(*link)->rb_right;
485 else
486 return cur_timewait_info;
487 }
488 timewait_info->inserted_remote_id = 1;
489 rb_link_node(&timewait_info->remote_id_node, parent, link);
490 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
491 return NULL;
492}
493
97f52eb4
SH		 494static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
495 __be32 remote_id)
a977049d
HR		 496{
497 struct rb_node *node = cm.remote_id_table.rb_node;
498 struct cm_timewait_info *timewait_info;
499
500 while (node) {
501 timewait_info = rb_entry(node, struct cm_timewait_info,
502 remote_id_node);
503 if (remote_id < timewait_info->work.remote_id)
504 node = node->rb_left;
505 else if (remote_id > timewait_info->work.remote_id)
506 node = node->rb_right;
507 else if (remote_ca_guid < timewait_info->remote_ca_guid)
508 node = node->rb_left;
509 else if (remote_ca_guid > timewait_info->remote_ca_guid)
510 node = node->rb_right;
511 else
512 return timewait_info;
513 }
514 return NULL;
515}
516
517static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
518 *timewait_info)
519{
520 struct rb_node **link = &cm.remote_qp_table.rb_node;
521 struct rb_node *parent = NULL;
522 struct cm_timewait_info *cur_timewait_info;
97f52eb4
SH		 523 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
524 __be32 remote_qpn = timewait_info->remote_qpn;
a977049d
HR		 525
526 while (*link) {
527 parent = *link;
528 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
529 remote_qp_node);
530 if (remote_qpn < cur_timewait_info->remote_qpn)
531 link = &(*link)->rb_left;
532 else if (remote_qpn > cur_timewait_info->remote_qpn)
533 link = &(*link)->rb_right;
534 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
535 link = &(*link)->rb_left;
536 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
537 link = &(*link)->rb_right;
538 else
539 return cur_timewait_info;
540 }
541 timewait_info->inserted_remote_qp = 1;
542 rb_link_node(&timewait_info->remote_qp_node, parent, link);
543 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
544 return NULL;
545}
546
547static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
548 *cm_id_priv)
549{
550 struct rb_node **link = &cm.remote_sidr_table.rb_node;
551 struct rb_node *parent = NULL;
552 struct cm_id_private *cur_cm_id_priv;
553 union ib_gid *port_gid = &cm_id_priv->av.dgid;
97f52eb4 554 __be32 remote_id = cm_id_priv->id.remote_id;
a977049d
HR		 555
556 while (*link) {
557 parent = *link;
558 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
559 sidr_id_node);
560 if (remote_id < cur_cm_id_priv->id.remote_id)
561 link = &(*link)->rb_left;
562 else if (remote_id > cur_cm_id_priv->id.remote_id)
563 link = &(*link)->rb_right;
564 else {
565 int cmp;
566 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
567 sizeof *port_gid);
568 if (cmp < 0)
569 link = &(*link)->rb_left;
570 else if (cmp > 0)
571 link = &(*link)->rb_right;
572 else
573 return cur_cm_id_priv;
574 }
575 }
576 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
577 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
578 return NULL;
579}
580
581static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
582 enum ib_cm_sidr_status status)
583{
584 struct ib_cm_sidr_rep_param param;
585
586 memset(&param, 0, sizeof param);
587 param.status = status;
588 ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
589}
590
07d357d0
SH		 591struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
592 ib_cm_handler cm_handler,
a977049d
HR		 593 void *context)
594{
595 struct cm_id_private *cm_id_priv;
596 int ret;
597
de6eb66b 598 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
a977049d
HR		 599 if (!cm_id_priv)
600 return ERR_PTR(-ENOMEM);
601
a977049d 602 cm_id_priv->id.state = IB_CM_IDLE;
07d357d0 603 cm_id_priv->id.device = device;
a977049d
HR		 604 cm_id_priv->id.cm_handler = cm_handler;
605 cm_id_priv->id.context = context;
354ba39c 606 cm_id_priv->id.remote_cm_qpn = 1;
a977049d
HR		 607 ret = cm_alloc_id(cm_id_priv);
608 if (ret)
609 goto error;
610
611 spin_lock_init(&cm_id_priv->lock);
1b52fa98 612 init_completion(&cm_id_priv->comp);
a977049d
HR		 613 INIT_LIST_HEAD(&cm_id_priv->work_list);
614 atomic_set(&cm_id_priv->work_count, -1);
615 atomic_set(&cm_id_priv->refcount, 1);
616 return &cm_id_priv->id;
617
618error:
619 kfree(cm_id_priv);
620 return ERR_PTR(-ENOMEM);
621}
622EXPORT_SYMBOL(ib_create_cm_id);
623
624static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
625{
626 struct cm_work *work;
627
628 if (list_empty(&cm_id_priv->work_list))
629 return NULL;
630
631 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
632 list_del(&work->list);
633 return work;
634}
635
636static void cm_free_work(struct cm_work *work)
637{
638 if (work->mad_recv_wc)
639 ib_free_recv_mad(work->mad_recv_wc);
640 kfree(work);
641}
642
643static inline int cm_convert_to_ms(int iba_time)
644{
645 /* approximate conversion to ms from 4.096us x 2^iba_time */
646 return 1 << max(iba_time - 8, 0);
647}
648
649static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
650{
a977049d
HR		 651 if (timewait_info->inserted_remote_id) {
652 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
653 timewait_info->inserted_remote_id = 0;
654 }
655
656 if (timewait_info->inserted_remote_qp) {
657 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
658 timewait_info->inserted_remote_qp = 0;
659 }
a977049d
HR		 660}
661
97f52eb4 662static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
a977049d
HR		 663{
664 struct cm_timewait_info *timewait_info;
665
de6eb66b 666 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
a977049d
HR		 667 if (!timewait_info)
668 return ERR_PTR(-ENOMEM);
a977049d
HR		 669
670 timewait_info->work.local_id = local_id;
c4028958 671 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
a977049d
HR		 672 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
673 return timewait_info;
674}
675
676static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
677{
678 int wait_time;
8575329d 679 unsigned long flags;
a977049d 680
8575329d 681 spin_lock_irqsave(&cm.lock, flags);
a70d0590 682 cm_cleanup_timewait(cm_id_priv->timewait_info);
8575329d
SH		 683 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
684 spin_unlock_irqrestore(&cm.lock, flags);
a70d0590 685
a977049d
HR		 686 /*
687 * The cm_id could be destroyed by the user before we exit timewait.
688 * To protect against this, we search for the cm_id after exiting
689 * timewait before notifying the user that we've exited timewait.
690 */
691 cm_id_priv->id.state = IB_CM_TIMEWAIT;
e1444b5a 692 wait_time = cm_convert_to_ms(cm_id_priv->av.packet_life_time + 1);
a977049d
HR		 693 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
694 msecs_to_jiffies(wait_time));
695 cm_id_priv->timewait_info = NULL;
696}
697
698static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
699{
8575329d
SH		 700 unsigned long flags;
701
a977049d
HR		 702 cm_id_priv->id.state = IB_CM_IDLE;
703 if (cm_id_priv->timewait_info) {
8575329d 704 spin_lock_irqsave(&cm.lock, flags);
a977049d 705 cm_cleanup_timewait(cm_id_priv->timewait_info);
8575329d 706 spin_unlock_irqrestore(&cm.lock, flags);
a977049d
HR		 707 kfree(cm_id_priv->timewait_info);
708 cm_id_priv->timewait_info = NULL;
709 }
710}
711
04c33543 712static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
a977049d
HR		 713{
714 struct cm_id_private *cm_id_priv;
715 struct cm_work *work;
716 unsigned long flags;
717
718 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
719retest:
720 spin_lock_irqsave(&cm_id_priv->lock, flags);
721 switch (cm_id->state) {
722 case IB_CM_LISTEN:
723 cm_id->state = IB_CM_IDLE;
724 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
725 spin_lock_irqsave(&cm.lock, flags);
726 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
727 spin_unlock_irqrestore(&cm.lock, flags);
728 break;
729 case IB_CM_SIDR_REQ_SENT:
730 cm_id->state = IB_CM_IDLE;
34816ad9 731 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d
HR		 732 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
733 break;
734 case IB_CM_SIDR_REQ_RCVD:
735 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
736 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
737 break;
738 case IB_CM_REQ_SENT:
227eca83
SH		 739 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
740 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
741 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
e971b8cd
SH		 742 &cm_id_priv->id.device->node_guid,
743 sizeof cm_id_priv->id.device->node_guid,
227eca83
SH		 744 NULL, 0);
745 break;
04c33543
MT		 746 case IB_CM_REQ_RCVD:
747 if (err == -ENOMEM) {
748 /* Do not reject to allow future retries. */
749 cm_reset_to_idle(cm_id_priv);
750 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
751 } else {
752 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
753 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
754 NULL, 0, NULL, 0);
755 }
756 break;
a977049d
HR		 757 case IB_CM_MRA_REQ_RCVD:
758 case IB_CM_REP_SENT:
759 case IB_CM_MRA_REP_RCVD:
34816ad9 760 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d 761 /* Fall through */
a977049d
HR		 762 case IB_CM_MRA_REQ_SENT:
763 case IB_CM_REP_RCVD:
764 case IB_CM_MRA_REP_SENT:
765 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
227eca83
SH		 766 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
767 NULL, 0, NULL, 0);
a977049d
HR		 768 break;
769 case IB_CM_ESTABLISHED:
770 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
771 ib_send_cm_dreq(cm_id, NULL, 0);
772 goto retest;
773 case IB_CM_DREQ_SENT:
34816ad9 774 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d
HR		 775 cm_enter_timewait(cm_id_priv);
776 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
777 break;
778 case IB_CM_DREQ_RCVD:
779 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
780 ib_send_cm_drep(cm_id, NULL, 0);
781 break;
782 default:
783 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
784 break;
785 }
786
787 cm_free_id(cm_id->local_id);
1b52fa98
SH		 788 cm_deref_id(cm_id_priv);
789 wait_for_completion(&cm_id_priv->comp);
a977049d
HR		 790 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
791 cm_free_work(work);
6e61d04f
SH		 792 kfree(cm_id_priv->compare_data);
793 kfree(cm_id_priv->private_data);
a977049d
HR		 794 kfree(cm_id_priv);
795}
04c33543
MT		 796
797void ib_destroy_cm_id(struct ib_cm_id *cm_id)
798{
799 cm_destroy_id(cm_id, 0);
800}
a977049d
HR		 801EXPORT_SYMBOL(ib_destroy_cm_id);
802
6e61d04f
SH		 803int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
804 struct ib_cm_compare_data *compare_data)
a977049d
HR		 805{
806 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
807 unsigned long flags;
808 int ret = 0;
809
97f52eb4
SH		 810 service_mask = service_mask ? service_mask :
811 __constant_cpu_to_be64(~0ULL);
a977049d
HR		 812 service_id &= service_mask;
813 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
814 (service_id != IB_CM_ASSIGN_SERVICE_ID))
815 return -EINVAL;
816
817 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
6e61d04f
SH		 818 if (cm_id->state != IB_CM_IDLE)
819 return -EINVAL;
820
821 if (compare_data) {
822 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
823 GFP_KERNEL);
824 if (!cm_id_priv->compare_data)
825 return -ENOMEM;
826 cm_mask_copy(cm_id_priv->compare_data->data,
827 compare_data->data, compare_data->mask);
828 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
829 IB_CM_COMPARE_SIZE);
830 }
a977049d
HR		 831
832 cm_id->state = IB_CM_LISTEN;
833
834 spin_lock_irqsave(&cm.lock, flags);
835 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
97f52eb4
SH		 836 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
837 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
a977049d
HR		 838 } else {
839 cm_id->service_id = service_id;
840 cm_id->service_mask = service_mask;
841 }
842 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
843 spin_unlock_irqrestore(&cm.lock, flags);
844
845 if (cur_cm_id_priv) {
846 cm_id->state = IB_CM_IDLE;
6e61d04f
SH		 847 kfree(cm_id_priv->compare_data);
848 cm_id_priv->compare_data = NULL;
a977049d
HR		 849 ret = -EBUSY;
850 }
851 return ret;
852}
853EXPORT_SYMBOL(ib_cm_listen);
854
97f52eb4
SH		 855static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
856 enum cm_msg_sequence msg_seq)
a977049d
HR		 857{
858 u64 hi_tid, low_tid;
859
860 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
97f52eb4
SH		 861 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
862 (msg_seq << 30));
a977049d
HR		 863 return cpu_to_be64(hi_tid | low_tid);
864}
865
866static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
97f52eb4 867 __be16 attr_id, __be64 tid)
a977049d
HR		 868{
869 hdr->base_version = IB_MGMT_BASE_VERSION;
870 hdr->mgmt_class = IB_MGMT_CLASS_CM;
871 hdr->class_version = IB_CM_CLASS_VERSION;
872 hdr->method = IB_MGMT_METHOD_SEND;
873 hdr->attr_id = attr_id;
874 hdr->tid = tid;
875}
876
877static void cm_format_req(struct cm_req_msg *req_msg,
878 struct cm_id_private *cm_id_priv,
879 struct ib_cm_req_param *param)
880{
881 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
882 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
883
884 req_msg->local_comm_id = cm_id_priv->id.local_id;
885 req_msg->service_id = param->service_id;
e971b8cd 886 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
a977049d
HR		 887 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
888 cm_req_set_resp_res(req_msg, param->responder_resources);
889 cm_req_set_init_depth(req_msg, param->initiator_depth);
890 cm_req_set_remote_resp_timeout(req_msg,
891 param->remote_cm_response_timeout);
892 cm_req_set_qp_type(req_msg, param->qp_type);
893 cm_req_set_flow_ctrl(req_msg, param->flow_control);
894 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
895 cm_req_set_local_resp_timeout(req_msg,
896 param->local_cm_response_timeout);
897 cm_req_set_retry_count(req_msg, param->retry_count);
898 req_msg->pkey = param->primary_path->pkey;
899 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
900 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
901 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
902 cm_req_set_srq(req_msg, param->srq);
903
904 req_msg->primary_local_lid = param->primary_path->slid;
905 req_msg->primary_remote_lid = param->primary_path->dlid;
906 req_msg->primary_local_gid = param->primary_path->sgid;
907 req_msg->primary_remote_gid = param->primary_path->dgid;
908 cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
909 cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
910 req_msg->primary_traffic_class = param->primary_path->traffic_class;
911 req_msg->primary_hop_limit = param->primary_path->hop_limit;
912 cm_req_set_primary_sl(req_msg, param->primary_path->sl);
913 cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
914 cm_req_set_primary_local_ack_timeout(req_msg,
915 min(31, param->primary_path->packet_life_time + 1));
916
917 if (param->alternate_path) {
918 req_msg->alt_local_lid = param->alternate_path->slid;
919 req_msg->alt_remote_lid = param->alternate_path->dlid;
920 req_msg->alt_local_gid = param->alternate_path->sgid;
921 req_msg->alt_remote_gid = param->alternate_path->dgid;
922 cm_req_set_alt_flow_label(req_msg,
923 param->alternate_path->flow_label);
924 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
925 req_msg->alt_traffic_class = param->alternate_path->traffic_class;
926 req_msg->alt_hop_limit = param->alternate_path->hop_limit;
927 cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
928 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
929 cm_req_set_alt_local_ack_timeout(req_msg,
930 min(31, param->alternate_path->packet_life_time + 1));
931 }
932
933 if (param->private_data && param->private_data_len)
934 memcpy(req_msg->private_data, param->private_data,
935 param->private_data_len);
936}
937
858119e1 938static int cm_validate_req_param(struct ib_cm_req_param *param)
a977049d
HR		 939{
940 /* peer-to-peer not supported */
941 if (param->peer_to_peer)
942 return -EINVAL;
943
944 if (!param->primary_path)
945 return -EINVAL;
946
947 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
948 return -EINVAL;
949
950 if (param->private_data &&
951 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
952 return -EINVAL;
953
954 if (param->alternate_path &&
955 (param->alternate_path->pkey != param->primary_path->pkey ||
956 param->alternate_path->mtu != param->primary_path->mtu))
957 return -EINVAL;
958
959 return 0;
960}
961
962int ib_send_cm_req(struct ib_cm_id *cm_id,
963 struct ib_cm_req_param *param)
964{
965 struct cm_id_private *cm_id_priv;
a977049d
HR		 966 struct cm_req_msg *req_msg;
967 unsigned long flags;
968 int ret;
969
970 ret = cm_validate_req_param(param);
971 if (ret)
972 return ret;
973
974 /* Verify that we're not in timewait. */
975 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
976 spin_lock_irqsave(&cm_id_priv->lock, flags);
977 if (cm_id->state != IB_CM_IDLE) {
978 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
979 ret = -EINVAL;
980 goto out;
981 }
982 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
983
984 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
985 id.local_id);
75df23e2
SH		 986 if (IS_ERR(cm_id_priv->timewait_info)) {
987 ret = PTR_ERR(cm_id_priv->timewait_info);
a977049d 988 goto out;
75df23e2 989 }
a977049d
HR		 990
991 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
992 if (ret)
993 goto error1;
994 if (param->alternate_path) {
995 ret = cm_init_av_by_path(param->alternate_path,
996 &cm_id_priv->alt_av);
997 if (ret)
998 goto error1;
999 }
1000 cm_id->service_id = param->service_id;
97f52eb4 1001 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
a977049d
HR		 1002 cm_id_priv->timeout_ms = cm_convert_to_ms(
1003 param->primary_path->packet_life_time) * 2 +
1004 cm_convert_to_ms(
1005 param->remote_cm_response_timeout);
1006 cm_id_priv->max_cm_retries = param->max_cm_retries;
1007 cm_id_priv->initiator_depth = param->initiator_depth;
1008 cm_id_priv->responder_resources = param->responder_resources;
1009 cm_id_priv->retry_count = param->retry_count;
1010 cm_id_priv->path_mtu = param->primary_path->mtu;
e1444b5a 1011 cm_id_priv->pkey = param->primary_path->pkey;
ae7971a7 1012 cm_id_priv->qp_type = param->qp_type;
a977049d
HR		 1013
1014 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1015 if (ret)
1016 goto error1;
1017
1018 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1019 cm_format_req(req_msg, cm_id_priv, param);
1020 cm_id_priv->tid = req_msg->hdr.tid;
34816ad9 1021 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
a977049d
HR		 1022 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1023
1024 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1025 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
a977049d
HR		 1026
1027 spin_lock_irqsave(&cm_id_priv->lock, flags);
34816ad9 1028 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
a977049d
HR		 1029 if (ret) {
1030 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1031 goto error2;
1032 }
1033 BUG_ON(cm_id->state != IB_CM_IDLE);
1034 cm_id->state = IB_CM_REQ_SENT;
1035 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1036 return 0;
1037
1038error2: cm_free_msg(cm_id_priv->msg);
1039error1: kfree(cm_id_priv->timewait_info);
1040out: return ret;
1041}
1042EXPORT_SYMBOL(ib_send_cm_req);
1043
1044static int cm_issue_rej(struct cm_port *port,
1045 struct ib_mad_recv_wc *mad_recv_wc,
1046 enum ib_cm_rej_reason reason,
1047 enum cm_msg_response msg_rejected,
1048 void *ari, u8 ari_length)
1049{
1050 struct ib_mad_send_buf *msg = NULL;
a977049d
HR		 1051 struct cm_rej_msg *rej_msg, *rcv_msg;
1052 int ret;
1053
1054 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1055 if (ret)
1056 return ret;
1057
1058 /* We just need common CM header information. Cast to any message. */
1059 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1060 rej_msg = (struct cm_rej_msg *) msg->mad;
1061
1062 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1063 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1064 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1065 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
97f52eb4 1066 rej_msg->reason = cpu_to_be16(reason);
a977049d
HR		 1067
1068 if (ari && ari_length) {
1069 cm_rej_set_reject_info_len(rej_msg, ari_length);
1070 memcpy(rej_msg->ari, ari, ari_length);
1071 }
1072
34816ad9 1073 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 1074 if (ret)
1075 cm_free_msg(msg);
1076
1077 return ret;
1078}
1079
97f52eb4
SH		 1080static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1081 __be32 local_qpn, __be32 remote_qpn)
a977049d
HR		 1082{
1083 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1084 ((local_ca_guid == remote_ca_guid) &&
1085 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1086}
1087
858119e1 1088static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
a977049d
HR		 1089 struct ib_sa_path_rec *primary_path,
1090 struct ib_sa_path_rec *alt_path)
1091{
1092 memset(primary_path, 0, sizeof *primary_path);
1093 primary_path->dgid = req_msg->primary_local_gid;
1094 primary_path->sgid = req_msg->primary_remote_gid;
1095 primary_path->dlid = req_msg->primary_local_lid;
1096 primary_path->slid = req_msg->primary_remote_lid;
1097 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1098 primary_path->hop_limit = req_msg->primary_hop_limit;
1099 primary_path->traffic_class = req_msg->primary_traffic_class;
1100 primary_path->reversible = 1;
1101 primary_path->pkey = req_msg->pkey;
1102 primary_path->sl = cm_req_get_primary_sl(req_msg);
1103 primary_path->mtu_selector = IB_SA_EQ;
1104 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1105 primary_path->rate_selector = IB_SA_EQ;
1106 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1107 primary_path->packet_life_time_selector = IB_SA_EQ;
1108 primary_path->packet_life_time =
1109 cm_req_get_primary_local_ack_timeout(req_msg);
1110 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1111
1112 if (req_msg->alt_local_lid) {
1113 memset(alt_path, 0, sizeof *alt_path);
1114 alt_path->dgid = req_msg->alt_local_gid;
1115 alt_path->sgid = req_msg->alt_remote_gid;
1116 alt_path->dlid = req_msg->alt_local_lid;
1117 alt_path->slid = req_msg->alt_remote_lid;
1118 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1119 alt_path->hop_limit = req_msg->alt_hop_limit;
1120 alt_path->traffic_class = req_msg->alt_traffic_class;
1121 alt_path->reversible = 1;
1122 alt_path->pkey = req_msg->pkey;
1123 alt_path->sl = cm_req_get_alt_sl(req_msg);
1124 alt_path->mtu_selector = IB_SA_EQ;
1125 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1126 alt_path->rate_selector = IB_SA_EQ;
1127 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1128 alt_path->packet_life_time_selector = IB_SA_EQ;
1129 alt_path->packet_life_time =
1130 cm_req_get_alt_local_ack_timeout(req_msg);
1131 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1132 }
1133}
1134
1135static void cm_format_req_event(struct cm_work *work,
1136 struct cm_id_private *cm_id_priv,
1137 struct ib_cm_id *listen_id)
1138{
1139 struct cm_req_msg *req_msg;
1140 struct ib_cm_req_event_param *param;
1141
1142 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1143 param = &work->cm_event.param.req_rcvd;
1144 param->listen_id = listen_id;
a977049d
HR		 1145 param->port = cm_id_priv->av.port->port_num;
1146 param->primary_path = &work->path[0];
1147 if (req_msg->alt_local_lid)
1148 param->alternate_path = &work->path[1];
1149 else
1150 param->alternate_path = NULL;
1151 param->remote_ca_guid = req_msg->local_ca_guid;
1152 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1153 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1154 param->qp_type = cm_req_get_qp_type(req_msg);
1155 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1156 param->responder_resources = cm_req_get_init_depth(req_msg);
1157 param->initiator_depth = cm_req_get_resp_res(req_msg);
1158 param->local_cm_response_timeout =
1159 cm_req_get_remote_resp_timeout(req_msg);
1160 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1161 param->remote_cm_response_timeout =
1162 cm_req_get_local_resp_timeout(req_msg);
1163 param->retry_count = cm_req_get_retry_count(req_msg);
1164 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1165 param->srq = cm_req_get_srq(req_msg);
1166 work->cm_event.private_data = &req_msg->private_data;
1167}
1168
1169static void cm_process_work(struct cm_id_private *cm_id_priv,
1170 struct cm_work *work)
1171{
1172 unsigned long flags;
1173 int ret;
1174
1175 /* We will typically only have the current event to report. */
1176 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1177 cm_free_work(work);
1178
1179 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1180 spin_lock_irqsave(&cm_id_priv->lock, flags);
1181 work = cm_dequeue_work(cm_id_priv);
1182 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1183 BUG_ON(!work);
1184 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1185 &work->cm_event);
1186 cm_free_work(work);
1187 }
1188 cm_deref_id(cm_id_priv);
1189 if (ret)
04c33543 1190 cm_destroy_id(&cm_id_priv->id, ret);
a977049d
HR		 1191}
1192
1193static void cm_format_mra(struct cm_mra_msg *mra_msg,
1194 struct cm_id_private *cm_id_priv,
1195 enum cm_msg_response msg_mraed, u8 service_timeout,
1196 const void *private_data, u8 private_data_len)
1197{
1198 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1199 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1200 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1201 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1202 cm_mra_set_service_timeout(mra_msg, service_timeout);
1203
1204 if (private_data && private_data_len)
1205 memcpy(mra_msg->private_data, private_data, private_data_len);
1206}
1207
1208static void cm_format_rej(struct cm_rej_msg *rej_msg,
1209 struct cm_id_private *cm_id_priv,
1210 enum ib_cm_rej_reason reason,
1211 void *ari,
1212 u8 ari_length,
1213 const void *private_data,
1214 u8 private_data_len)
1215{
1216 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1217 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1218
1219 switch(cm_id_priv->id.state) {
1220 case IB_CM_REQ_RCVD:
1221 rej_msg->local_comm_id = 0;
1222 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1223 break;
1224 case IB_CM_MRA_REQ_SENT:
1225 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1226 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1227 break;
1228 case IB_CM_REP_RCVD:
1229 case IB_CM_MRA_REP_SENT:
1230 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1231 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1232 break;
1233 default:
1234 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1235 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1236 break;
1237 }
1238
97f52eb4 1239 rej_msg->reason = cpu_to_be16(reason);
a977049d
HR		 1240 if (ari && ari_length) {
1241 cm_rej_set_reject_info_len(rej_msg, ari_length);
1242 memcpy(rej_msg->ari, ari, ari_length);
1243 }
1244
1245 if (private_data && private_data_len)
1246 memcpy(rej_msg->private_data, private_data, private_data_len);
1247}
1248
1249static void cm_dup_req_handler(struct cm_work *work,
1250 struct cm_id_private *cm_id_priv)
1251{
1252 struct ib_mad_send_buf *msg = NULL;
a977049d
HR		 1253 unsigned long flags;
1254 int ret;
1255
1256 /* Quick state check to discard duplicate REQs. */
1257 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1258 return;
1259
1260 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1261 if (ret)
1262 return;
1263
1264 spin_lock_irqsave(&cm_id_priv->lock, flags);
1265 switch (cm_id_priv->id.state) {
1266 case IB_CM_MRA_REQ_SENT:
1267 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1268 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1269 cm_id_priv->private_data,
1270 cm_id_priv->private_data_len);
1271 break;
1272 case IB_CM_TIMEWAIT:
1273 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1274 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1275 break;
1276 default:
1277 goto unlock;
1278 }
1279 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1280
34816ad9 1281 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 1282 if (ret)
1283 goto free;
1284 return;
1285
1286unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1287free: cm_free_msg(msg);
1288}
1289
1290static struct cm_id_private * cm_match_req(struct cm_work *work,
1291 struct cm_id_private *cm_id_priv)
1292{
1293 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1294 struct cm_timewait_info *timewait_info;
1295 struct cm_req_msg *req_msg;
1296 unsigned long flags;
1297
1298 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1299
1300 /* Check for duplicate REQ and stale connections. */
1301 spin_lock_irqsave(&cm.lock, flags);
1302 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1303 if (!timewait_info)
1304 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1305
1306 if (timewait_info) {
1307 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1308 timewait_info->work.remote_id);
8575329d 1309 cm_cleanup_timewait(cm_id_priv->timewait_info);
a977049d
HR		 1310 spin_unlock_irqrestore(&cm.lock, flags);
1311 if (cur_cm_id_priv) {
1312 cm_dup_req_handler(work, cur_cm_id_priv);
1313 cm_deref_id(cur_cm_id_priv);
1314 } else
1315 cm_issue_rej(work->port, work->mad_recv_wc,
1316 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1317 NULL, 0);
8575329d
SH		 1318 listen_cm_id_priv = NULL;
1319 goto out;
a977049d
HR		 1320 }
1321
1322 /* Find matching listen request. */
07d357d0 1323 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
6e61d04f
SH		 1324 req_msg->service_id,
1325 req_msg->private_data);
a977049d 1326 if (!listen_cm_id_priv) {
8575329d 1327 cm_cleanup_timewait(cm_id_priv->timewait_info);
a977049d
HR		 1328 spin_unlock_irqrestore(&cm.lock, flags);
1329 cm_issue_rej(work->port, work->mad_recv_wc,
1330 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1331 NULL, 0);
8575329d 1332 goto out;
a977049d
HR		 1333 }
1334 atomic_inc(&listen_cm_id_priv->refcount);
1335 atomic_inc(&cm_id_priv->refcount);
1336 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1337 atomic_inc(&cm_id_priv->work_count);
1338 spin_unlock_irqrestore(&cm.lock, flags);
8575329d 1339out:
a977049d 1340 return listen_cm_id_priv;
a977049d
HR		 1341}
1342
1343static int cm_req_handler(struct cm_work *work)
1344{
1345 struct ib_cm_id *cm_id;
1346 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1347 struct cm_req_msg *req_msg;
1348 int ret;
1349
1350 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1351
07d357d0 1352 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
a977049d
HR		 1353 if (IS_ERR(cm_id))
1354 return PTR_ERR(cm_id);
1355
1356 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1357 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1358 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
ca222c6b 1359 work->mad_recv_wc->recv_buf.grh,
a977049d
HR		 1360 &cm_id_priv->av);
1361 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1362 id.local_id);
1363 if (IS_ERR(cm_id_priv->timewait_info)) {
1364 ret = PTR_ERR(cm_id_priv->timewait_info);
76842405 1365 goto destroy;
a977049d
HR		 1366 }
1367 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1368 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1369 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1370
1371 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1372 if (!listen_cm_id_priv) {
1373 ret = -EINVAL;
76842405
SH		 1374 kfree(cm_id_priv->timewait_info);
1375 goto destroy;
a977049d
HR		 1376 }
1377
1378 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1379 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1380 cm_id_priv->id.service_id = req_msg->service_id;
97f52eb4 1381 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
a977049d
HR		 1382
1383 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1384 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
76842405
SH		 1385 if (ret) {
1386 ib_get_cached_gid(work->port->cm_dev->device,
1387 work->port->port_num, 0, &work->path[0].sgid);
1388 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1389 &work->path[0].sgid, sizeof work->path[0].sgid,
1390 NULL, 0);
1391 goto rejected;
1392 }
a977049d
HR		 1393 if (req_msg->alt_local_lid) {
1394 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
76842405
SH		 1395 if (ret) {
1396 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1397 &work->path[0].sgid,
1398 sizeof work->path[0].sgid, NULL, 0);
1399 goto rejected;
1400 }
a977049d
HR		 1401 }
1402 cm_id_priv->tid = req_msg->hdr.tid;
1403 cm_id_priv->timeout_ms = cm_convert_to_ms(
1404 cm_req_get_local_resp_timeout(req_msg));
1405 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1406 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1407 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1408 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1409 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
e1444b5a 1410 cm_id_priv->pkey = req_msg->pkey;
a977049d 1411 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
a977049d
HR		 1412 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1413 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
ae7971a7 1414 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
a977049d
HR		 1415
1416 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1417 cm_process_work(cm_id_priv, work);
1418 cm_deref_id(listen_cm_id_priv);
1419 return 0;
1420
76842405
SH		 1421rejected:
1422 atomic_dec(&cm_id_priv->refcount);
a977049d 1423 cm_deref_id(listen_cm_id_priv);
76842405
SH		 1424destroy:
1425 ib_destroy_cm_id(cm_id);
a977049d
HR		 1426 return ret;
1427}
1428
1429static void cm_format_rep(struct cm_rep_msg *rep_msg,
1430 struct cm_id_private *cm_id_priv,
1431 struct ib_cm_rep_param *param)
1432{
1433 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1434 rep_msg->local_comm_id = cm_id_priv->id.local_id;
1435 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1436 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1437 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1438 rep_msg->resp_resources = param->responder_resources;
1439 rep_msg->initiator_depth = param->initiator_depth;
1440 cm_rep_set_target_ack_delay(rep_msg, param->target_ack_delay);
1441 cm_rep_set_failover(rep_msg, param->failover_accepted);
1442 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1443 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1444 cm_rep_set_srq(rep_msg, param->srq);
e971b8cd 1445 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
a977049d
HR		 1446
1447 if (param->private_data && param->private_data_len)
1448 memcpy(rep_msg->private_data, param->private_data,
1449 param->private_data_len);
1450}
1451
1452int ib_send_cm_rep(struct ib_cm_id *cm_id,
1453 struct ib_cm_rep_param *param)
1454{
1455 struct cm_id_private *cm_id_priv;
1456 struct ib_mad_send_buf *msg;
1457 struct cm_rep_msg *rep_msg;
a977049d
HR		 1458 unsigned long flags;
1459 int ret;
1460
1461 if (param->private_data &&
1462 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1463 return -EINVAL;
1464
1465 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1466 spin_lock_irqsave(&cm_id_priv->lock, flags);
1467 if (cm_id->state != IB_CM_REQ_RCVD &&
1468 cm_id->state != IB_CM_MRA_REQ_SENT) {
1469 ret = -EINVAL;
1470 goto out;
1471 }
1472
1473 ret = cm_alloc_msg(cm_id_priv, &msg);
1474 if (ret)
1475 goto out;
1476
1477 rep_msg = (struct cm_rep_msg *) msg->mad;
1478 cm_format_rep(rep_msg, cm_id_priv, param);
34816ad9 1479 msg->timeout_ms = cm_id_priv->timeout_ms;
a977049d
HR		 1480 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1481
34816ad9 1482 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 1483 if (ret) {
1484 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1485 cm_free_msg(msg);
1486 return ret;
1487 }
1488
1489 cm_id->state = IB_CM_REP_SENT;
1490 cm_id_priv->msg = msg;
1491 cm_id_priv->initiator_depth = param->initiator_depth;
1492 cm_id_priv->responder_resources = param->responder_resources;
1493 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1494 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1495
1496out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1497 return ret;
1498}
1499EXPORT_SYMBOL(ib_send_cm_rep);
1500
1501static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1502 struct cm_id_private *cm_id_priv,
1503 const void *private_data,
1504 u8 private_data_len)
1505{
1506 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1507 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1508 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1509
1510 if (private_data && private_data_len)
1511 memcpy(rtu_msg->private_data, private_data, private_data_len);
1512}
1513
1514int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1515 const void *private_data,
1516 u8 private_data_len)
1517{
1518 struct cm_id_private *cm_id_priv;
1519 struct ib_mad_send_buf *msg;
a977049d
HR		 1520 unsigned long flags;
1521 void *data;
1522 int ret;
1523
1524 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1525 return -EINVAL;
1526
1527 data = cm_copy_private_data(private_data, private_data_len);
1528 if (IS_ERR(data))
1529 return PTR_ERR(data);
1530
1531 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1532 spin_lock_irqsave(&cm_id_priv->lock, flags);
1533 if (cm_id->state != IB_CM_REP_RCVD &&
1534 cm_id->state != IB_CM_MRA_REP_SENT) {
1535 ret = -EINVAL;
1536 goto error;
1537 }
1538
1539 ret = cm_alloc_msg(cm_id_priv, &msg);
1540 if (ret)
1541 goto error;
1542
1543 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1544 private_data, private_data_len);
1545
34816ad9 1546 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 1547 if (ret) {
1548 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1549 cm_free_msg(msg);
1550 kfree(data);
1551 return ret;
1552 }
1553
1554 cm_id->state = IB_CM_ESTABLISHED;
1555 cm_set_private_data(cm_id_priv, data, private_data_len);
1556 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1557 return 0;
1558
1559error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1560 kfree(data);
1561 return ret;
1562}
1563EXPORT_SYMBOL(ib_send_cm_rtu);
1564
1565static void cm_format_rep_event(struct cm_work *work)
1566{
1567 struct cm_rep_msg *rep_msg;
1568 struct ib_cm_rep_event_param *param;
1569
1570 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1571 param = &work->cm_event.param.rep_rcvd;
1572 param->remote_ca_guid = rep_msg->local_ca_guid;
1573 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1574 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1575 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1576 param->responder_resources = rep_msg->initiator_depth;
1577 param->initiator_depth = rep_msg->resp_resources;
1578 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1579 param->failover_accepted = cm_rep_get_failover(rep_msg);
1580 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1581 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1582 param->srq = cm_rep_get_srq(rep_msg);
1583 work->cm_event.private_data = &rep_msg->private_data;
1584}
1585
1586static void cm_dup_rep_handler(struct cm_work *work)
1587{
1588 struct cm_id_private *cm_id_priv;
1589 struct cm_rep_msg *rep_msg;
1590 struct ib_mad_send_buf *msg = NULL;
a977049d
HR		 1591 unsigned long flags;
1592 int ret;
1593
1594 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1595 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1596 rep_msg->local_comm_id);
1597 if (!cm_id_priv)
1598 return;
1599
1600 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1601 if (ret)
1602 goto deref;
1603
1604 spin_lock_irqsave(&cm_id_priv->lock, flags);
1605 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1606 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1607 cm_id_priv->private_data,
1608 cm_id_priv->private_data_len);
1609 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1610 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1611 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1612 cm_id_priv->private_data,
1613 cm_id_priv->private_data_len);
1614 else
1615 goto unlock;
1616 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1617
34816ad9 1618 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 1619 if (ret)
1620 goto free;
1621 goto deref;
1622
1623unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1624free: cm_free_msg(msg);
1625deref: cm_deref_id(cm_id_priv);
1626}
1627
1628static int cm_rep_handler(struct cm_work *work)
1629{
1630 struct cm_id_private *cm_id_priv;
1631 struct cm_rep_msg *rep_msg;
1632 unsigned long flags;
1633 int ret;
1634
1635 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1636 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1637 if (!cm_id_priv) {
1638 cm_dup_rep_handler(work);
1639 return -EINVAL;
1640 }
1641
87fd1a11
SH		 1642 cm_format_rep_event(work);
1643
1644 spin_lock_irqsave(&cm_id_priv->lock, flags);
1645 switch (cm_id_priv->id.state) {
1646 case IB_CM_REQ_SENT:
1647 case IB_CM_MRA_REQ_RCVD:
1648 break;
1649 default:
1650 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1651 ret = -EINVAL;
1652 goto error;
1653 }
1654
a977049d
HR		 1655 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1656 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1657 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1658
87fd1a11 1659 spin_lock(&cm.lock);
a977049d
HR		 1660 /* Check for duplicate REP. */
1661 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
87fd1a11
SH		 1662 spin_unlock(&cm.lock);
1663 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
a977049d
HR		 1664 ret = -EINVAL;
1665 goto error;
1666 }
1667 /* Check for a stale connection. */
1668 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
87fd1a11
SH		 1669 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1670 &cm.remote_id_table);
1671 cm_id_priv->timewait_info->inserted_remote_id = 0;
1672 spin_unlock(&cm.lock);
1673 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
a977049d
HR		 1674 cm_issue_rej(work->port, work->mad_recv_wc,
1675 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1676 NULL, 0);
1677 ret = -EINVAL;
1678 goto error;
1679 }
87fd1a11 1680 spin_unlock(&cm.lock);
a977049d 1681
a977049d
HR		 1682 cm_id_priv->id.state = IB_CM_REP_RCVD;
1683 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1684 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1685 cm_id_priv->initiator_depth = rep_msg->resp_resources;
1686 cm_id_priv->responder_resources = rep_msg->initiator_depth;
1687 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1688 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1689
1690 /* todo: handle peer_to_peer */
1691
34816ad9 1692 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d
HR		 1693 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1694 if (!ret)
1695 list_add_tail(&work->list, &cm_id_priv->work_list);
1696 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1697
1698 if (ret)
1699 cm_process_work(cm_id_priv, work);
1700 else
1701 cm_deref_id(cm_id_priv);
1702 return 0;
1703
87fd1a11 1704error:
a977049d
HR		 1705 cm_deref_id(cm_id_priv);
1706 return ret;
1707}
1708
1709static int cm_establish_handler(struct cm_work *work)
1710{
1711 struct cm_id_private *cm_id_priv;
1712 unsigned long flags;
1713 int ret;
1714
e1444b5a 1715 /* See comment in cm_establish about lookup. */
a977049d
HR		 1716 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1717 if (!cm_id_priv)
1718 return -EINVAL;
1719
1720 spin_lock_irqsave(&cm_id_priv->lock, flags);
1721 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1722 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1723 goto out;
1724 }
1725
34816ad9 1726 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d
HR		 1727 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1728 if (!ret)
1729 list_add_tail(&work->list, &cm_id_priv->work_list);
1730 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1731
1732 if (ret)
1733 cm_process_work(cm_id_priv, work);
1734 else
1735 cm_deref_id(cm_id_priv);
1736 return 0;
1737out:
1738 cm_deref_id(cm_id_priv);
1739 return -EINVAL;
1740}
1741
1742static int cm_rtu_handler(struct cm_work *work)
1743{
1744 struct cm_id_private *cm_id_priv;
1745 struct cm_rtu_msg *rtu_msg;
1746 unsigned long flags;
1747 int ret;
1748
1749 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1750 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1751 rtu_msg->local_comm_id);
1752 if (!cm_id_priv)
1753 return -EINVAL;
1754
1755 work->cm_event.private_data = &rtu_msg->private_data;
1756
1757 spin_lock_irqsave(&cm_id_priv->lock, flags);
1758 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1759 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1760 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1761 goto out;
1762 }
1763 cm_id_priv->id.state = IB_CM_ESTABLISHED;
1764
34816ad9 1765 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d
HR		 1766 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1767 if (!ret)
1768 list_add_tail(&work->list, &cm_id_priv->work_list);
1769 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1770
1771 if (ret)
1772 cm_process_work(cm_id_priv, work);
1773 else
1774 cm_deref_id(cm_id_priv);
1775 return 0;
1776out:
1777 cm_deref_id(cm_id_priv);
1778 return -EINVAL;
1779}
1780
1781static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1782 struct cm_id_private *cm_id_priv,
1783 const void *private_data,
1784 u8 private_data_len)
1785{
1786 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1787 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1788 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1789 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1790 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1791
1792 if (private_data && private_data_len)
1793 memcpy(dreq_msg->private_data, private_data, private_data_len);
1794}
1795
1796int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1797 const void *private_data,
1798 u8 private_data_len)
1799{
1800 struct cm_id_private *cm_id_priv;
1801 struct ib_mad_send_buf *msg;
a977049d
HR		 1802 unsigned long flags;
1803 int ret;
1804
1805 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1806 return -EINVAL;
1807
1808 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1809 spin_lock_irqsave(&cm_id_priv->lock, flags);
1810 if (cm_id->state != IB_CM_ESTABLISHED) {
1811 ret = -EINVAL;
1812 goto out;
1813 }
1814
1815 ret = cm_alloc_msg(cm_id_priv, &msg);
1816 if (ret) {
1817 cm_enter_timewait(cm_id_priv);
1818 goto out;
1819 }
1820
1821 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1822 private_data, private_data_len);
34816ad9 1823 msg->timeout_ms = cm_id_priv->timeout_ms;
a977049d
HR		 1824 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1825
34816ad9 1826 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 1827 if (ret) {
1828 cm_enter_timewait(cm_id_priv);
1829 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1830 cm_free_msg(msg);
1831 return ret;
1832 }
1833
1834 cm_id->state = IB_CM_DREQ_SENT;
1835 cm_id_priv->msg = msg;
1836out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1837 return ret;
1838}
1839EXPORT_SYMBOL(ib_send_cm_dreq);
1840
1841static void cm_format_drep(struct cm_drep_msg *drep_msg,
1842 struct cm_id_private *cm_id_priv,
1843 const void *private_data,
1844 u8 private_data_len)
1845{
1846 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1847 drep_msg->local_comm_id = cm_id_priv->id.local_id;
1848 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1849
1850 if (private_data && private_data_len)
1851 memcpy(drep_msg->private_data, private_data, private_data_len);
1852}
1853
1854int ib_send_cm_drep(struct ib_cm_id *cm_id,
1855 const void *private_data,
1856 u8 private_data_len)
1857{
1858 struct cm_id_private *cm_id_priv;
1859 struct ib_mad_send_buf *msg;
a977049d
HR		 1860 unsigned long flags;
1861 void *data;
1862 int ret;
1863
1864 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1865 return -EINVAL;
1866
1867 data = cm_copy_private_data(private_data, private_data_len);
1868 if (IS_ERR(data))
1869 return PTR_ERR(data);
1870
1871 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1872 spin_lock_irqsave(&cm_id_priv->lock, flags);
1873 if (cm_id->state != IB_CM_DREQ_RCVD) {
1874 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1875 kfree(data);
1876 return -EINVAL;
1877 }
1878
1879 cm_set_private_data(cm_id_priv, data, private_data_len);
1880 cm_enter_timewait(cm_id_priv);
1881
1882 ret = cm_alloc_msg(cm_id_priv, &msg);
1883 if (ret)
1884 goto out;
1885
1886 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1887 private_data, private_data_len);
1888
34816ad9 1889 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 1890 if (ret) {
1891 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1892 cm_free_msg(msg);
1893 return ret;
1894 }
1895
1896out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1897 return ret;
1898}
1899EXPORT_SYMBOL(ib_send_cm_drep);
1900
82a9c16a
SH		 1901static int cm_issue_drep(struct cm_port *port,
1902 struct ib_mad_recv_wc *mad_recv_wc)
1903{
1904 struct ib_mad_send_buf *msg = NULL;
1905 struct cm_dreq_msg *dreq_msg;
1906 struct cm_drep_msg *drep_msg;
1907 int ret;
1908
1909 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1910 if (ret)
1911 return ret;
1912
1913 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
1914 drep_msg = (struct cm_drep_msg *) msg->mad;
1915
1916 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
1917 drep_msg->remote_comm_id = dreq_msg->local_comm_id;
1918 drep_msg->local_comm_id = dreq_msg->remote_comm_id;
1919
1920 ret = ib_post_send_mad(msg, NULL);
1921 if (ret)
1922 cm_free_msg(msg);
1923
1924 return ret;
1925}
1926
a977049d
HR		 1927static int cm_dreq_handler(struct cm_work *work)
1928{
1929 struct cm_id_private *cm_id_priv;
1930 struct cm_dreq_msg *dreq_msg;
1931 struct ib_mad_send_buf *msg = NULL;
a977049d
HR		 1932 unsigned long flags;
1933 int ret;
1934
1935 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
1936 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
1937 dreq_msg->local_comm_id);
82a9c16a
SH		 1938 if (!cm_id_priv) {
1939 cm_issue_drep(work->port, work->mad_recv_wc);
a977049d 1940 return -EINVAL;
82a9c16a 1941 }
a977049d
HR		 1942
1943 work->cm_event.private_data = &dreq_msg->private_data;
1944
1945 spin_lock_irqsave(&cm_id_priv->lock, flags);
1946 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
1947 goto unlock;
1948
1949 switch (cm_id_priv->id.state) {
1950 case IB_CM_REP_SENT:
1951 case IB_CM_DREQ_SENT:
34816ad9 1952 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d
HR		 1953 break;
1954 case IB_CM_ESTABLISHED:
1955 case IB_CM_MRA_REP_RCVD:
1956 break;
1957 case IB_CM_TIMEWAIT:
1958 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
1959 goto unlock;
1960
1961 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1962 cm_id_priv->private_data,
1963 cm_id_priv->private_data_len);
1964 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1965
34816ad9 1966 if (ib_post_send_mad(msg, NULL))
a977049d
HR		 1967 cm_free_msg(msg);
1968 goto deref;
1969 default:
1970 goto unlock;
1971 }
1972 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
1973 cm_id_priv->tid = dreq_msg->hdr.tid;
1974 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1975 if (!ret)
1976 list_add_tail(&work->list, &cm_id_priv->work_list);
1977 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1978
1979 if (ret)
1980 cm_process_work(cm_id_priv, work);
1981 else
1982 cm_deref_id(cm_id_priv);
1983 return 0;
1984
1985unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1986deref: cm_deref_id(cm_id_priv);
1987 return -EINVAL;
1988}
1989
1990static int cm_drep_handler(struct cm_work *work)
1991{
1992 struct cm_id_private *cm_id_priv;
1993 struct cm_drep_msg *drep_msg;
1994 unsigned long flags;
1995 int ret;
1996
1997 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
1998 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
1999 drep_msg->local_comm_id);
2000 if (!cm_id_priv)
2001 return -EINVAL;
2002
2003 work->cm_event.private_data = &drep_msg->private_data;
2004
2005 spin_lock_irqsave(&cm_id_priv->lock, flags);
2006 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2007 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2008 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2009 goto out;
2010 }
2011 cm_enter_timewait(cm_id_priv);
2012
34816ad9 2013 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d
HR		 2014 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2015 if (!ret)
2016 list_add_tail(&work->list, &cm_id_priv->work_list);
2017 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2018
2019 if (ret)
2020 cm_process_work(cm_id_priv, work);
2021 else
2022 cm_deref_id(cm_id_priv);
2023 return 0;
2024out:
2025 cm_deref_id(cm_id_priv);
2026 return -EINVAL;
2027}
2028
2029int ib_send_cm_rej(struct ib_cm_id *cm_id,
2030 enum ib_cm_rej_reason reason,
2031 void *ari,
2032 u8 ari_length,
2033 const void *private_data,
2034 u8 private_data_len)
2035{
2036 struct cm_id_private *cm_id_priv;
2037 struct ib_mad_send_buf *msg;
a977049d
HR		 2038 unsigned long flags;
2039 int ret;
2040
2041 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2042 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2043 return -EINVAL;
2044
2045 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2046
2047 spin_lock_irqsave(&cm_id_priv->lock, flags);
2048 switch (cm_id->state) {
2049 case IB_CM_REQ_SENT:
2050 case IB_CM_MRA_REQ_RCVD:
2051 case IB_CM_REQ_RCVD:
2052 case IB_CM_MRA_REQ_SENT:
2053 case IB_CM_REP_RCVD:
2054 case IB_CM_MRA_REP_SENT:
2055 ret = cm_alloc_msg(cm_id_priv, &msg);
2056 if (!ret)
2057 cm_format_rej((struct cm_rej_msg *) msg->mad,
2058 cm_id_priv, reason, ari, ari_length,
2059 private_data, private_data_len);
2060
2061 cm_reset_to_idle(cm_id_priv);
2062 break;
2063 case IB_CM_REP_SENT:
2064 case IB_CM_MRA_REP_RCVD:
2065 ret = cm_alloc_msg(cm_id_priv, &msg);
2066 if (!ret)
2067 cm_format_rej((struct cm_rej_msg *) msg->mad,
2068 cm_id_priv, reason, ari, ari_length,
2069 private_data, private_data_len);
2070
2071 cm_enter_timewait(cm_id_priv);
2072 break;
2073 default:
2074 ret = -EINVAL;
2075 goto out;
2076 }
2077
2078 if (ret)
2079 goto out;
2080
34816ad9 2081 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 2082 if (ret)
2083 cm_free_msg(msg);
2084
2085out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2086 return ret;
2087}
2088EXPORT_SYMBOL(ib_send_cm_rej);
2089
2090static void cm_format_rej_event(struct cm_work *work)
2091{
2092 struct cm_rej_msg *rej_msg;
2093 struct ib_cm_rej_event_param *param;
2094
2095 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2096 param = &work->cm_event.param.rej_rcvd;
2097 param->ari = rej_msg->ari;
2098 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
97f52eb4 2099 param->reason = __be16_to_cpu(rej_msg->reason);
a977049d
HR		 2100 work->cm_event.private_data = &rej_msg->private_data;
2101}
2102
2103static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2104{
2105 struct cm_timewait_info *timewait_info;
2106 struct cm_id_private *cm_id_priv;
2107 unsigned long flags;
97f52eb4 2108 __be32 remote_id;
a977049d
HR		 2109
2110 remote_id = rej_msg->local_comm_id;
2111
97f52eb4 2112 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
a977049d 2113 spin_lock_irqsave(&cm.lock, flags);
97f52eb4 2114 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
a977049d
HR		 2115 remote_id);
2116 if (!timewait_info) {
2117 spin_unlock_irqrestore(&cm.lock, flags);
2118 return NULL;
2119 }
f06d2653
SH		 2120 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2121 (timewait_info->work.local_id ^
2122 cm.random_id_operand));
a977049d
HR		 2123 if (cm_id_priv) {
2124 if (cm_id_priv->id.remote_id == remote_id)
2125 atomic_inc(&cm_id_priv->refcount);
2126 else
2127 cm_id_priv = NULL;
2128 }
2129 spin_unlock_irqrestore(&cm.lock, flags);
2130 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2131 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2132 else
2133 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2134
2135 return cm_id_priv;
2136}
2137
2138static int cm_rej_handler(struct cm_work *work)
2139{
2140 struct cm_id_private *cm_id_priv;
2141 struct cm_rej_msg *rej_msg;
2142 unsigned long flags;
2143 int ret;
2144
2145 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2146 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2147 if (!cm_id_priv)
2148 return -EINVAL;
2149
2150 cm_format_rej_event(work);
2151
2152 spin_lock_irqsave(&cm_id_priv->lock, flags);
2153 switch (cm_id_priv->id.state) {
2154 case IB_CM_REQ_SENT:
2155 case IB_CM_MRA_REQ_RCVD:
2156 case IB_CM_REP_SENT:
2157 case IB_CM_MRA_REP_RCVD:
34816ad9 2158 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d
HR		 2159 /* fall through */
2160 case IB_CM_REQ_RCVD:
2161 case IB_CM_MRA_REQ_SENT:
97f52eb4 2162 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
a977049d
HR		 2163 cm_enter_timewait(cm_id_priv);
2164 else
2165 cm_reset_to_idle(cm_id_priv);
2166 break;
2167 case IB_CM_DREQ_SENT:
34816ad9 2168 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d
HR		 2169 /* fall through */
2170 case IB_CM_REP_RCVD:
2171 case IB_CM_MRA_REP_SENT:
2172 case IB_CM_ESTABLISHED:
2173 cm_enter_timewait(cm_id_priv);
2174 break;
2175 default:
2176 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2177 ret = -EINVAL;
2178 goto out;
2179 }
2180
2181 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2182 if (!ret)
2183 list_add_tail(&work->list, &cm_id_priv->work_list);
2184 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2185
2186 if (ret)
2187 cm_process_work(cm_id_priv, work);
2188 else
2189 cm_deref_id(cm_id_priv);
2190 return 0;
2191out:
2192 cm_deref_id(cm_id_priv);
2193 return -EINVAL;
2194}
2195
2196int ib_send_cm_mra(struct ib_cm_id *cm_id,
2197 u8 service_timeout,
2198 const void *private_data,
2199 u8 private_data_len)
2200{
2201 struct cm_id_private *cm_id_priv;
2202 struct ib_mad_send_buf *msg;
a977049d
HR		 2203 void *data;
2204 unsigned long flags;
2205 int ret;
2206
2207 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2208 return -EINVAL;
2209
2210 data = cm_copy_private_data(private_data, private_data_len);
2211 if (IS_ERR(data))
2212 return PTR_ERR(data);
2213
2214 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2215
2216 spin_lock_irqsave(&cm_id_priv->lock, flags);
2217 switch(cm_id_priv->id.state) {
2218 case IB_CM_REQ_RCVD:
2219 ret = cm_alloc_msg(cm_id_priv, &msg);
2220 if (ret)
2221 goto error1;
2222
2223 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2224 CM_MSG_RESPONSE_REQ, service_timeout,
2225 private_data, private_data_len);
34816ad9 2226 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 2227 if (ret)
2228 goto error2;
2229 cm_id->state = IB_CM_MRA_REQ_SENT;
2230 break;
2231 case IB_CM_REP_RCVD:
2232 ret = cm_alloc_msg(cm_id_priv, &msg);
2233 if (ret)
2234 goto error1;
2235
2236 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2237 CM_MSG_RESPONSE_REP, service_timeout,
2238 private_data, private_data_len);
34816ad9 2239 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 2240 if (ret)
2241 goto error2;
2242 cm_id->state = IB_CM_MRA_REP_SENT;
2243 break;
2244 case IB_CM_ESTABLISHED:
2245 ret = cm_alloc_msg(cm_id_priv, &msg);
2246 if (ret)
2247 goto error1;
2248
2249 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2250 CM_MSG_RESPONSE_OTHER, service_timeout,
2251 private_data, private_data_len);
34816ad9 2252 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 2253 if (ret)
2254 goto error2;
2255 cm_id->lap_state = IB_CM_MRA_LAP_SENT;
2256 break;
2257 default:
2258 ret = -EINVAL;
2259 goto error1;
2260 }
2261 cm_id_priv->service_timeout = service_timeout;
2262 cm_set_private_data(cm_id_priv, data, private_data_len);
2263 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2264 return 0;
2265
2266error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2267 kfree(data);
2268 return ret;
2269
2270error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2271 kfree(data);
2272 cm_free_msg(msg);
2273 return ret;
2274}
2275EXPORT_SYMBOL(ib_send_cm_mra);
2276
2277static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2278{
2279 switch (cm_mra_get_msg_mraed(mra_msg)) {
2280 case CM_MSG_RESPONSE_REQ:
2281 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2282 case CM_MSG_RESPONSE_REP:
2283 case CM_MSG_RESPONSE_OTHER:
2284 return cm_acquire_id(mra_msg->remote_comm_id,
2285 mra_msg->local_comm_id);
2286 default:
2287 return NULL;
2288 }
2289}
2290
2291static int cm_mra_handler(struct cm_work *work)
2292{
2293 struct cm_id_private *cm_id_priv;
2294 struct cm_mra_msg *mra_msg;
2295 unsigned long flags;
2296 int timeout, ret;
2297
2298 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2299 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2300 if (!cm_id_priv)
2301 return -EINVAL;
2302
2303 work->cm_event.private_data = &mra_msg->private_data;
2304 work->cm_event.param.mra_rcvd.service_timeout =
2305 cm_mra_get_service_timeout(mra_msg);
2306 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2307 cm_convert_to_ms(cm_id_priv->av.packet_life_time);
2308
2309 spin_lock_irqsave(&cm_id_priv->lock, flags);
2310 switch (cm_id_priv->id.state) {
2311 case IB_CM_REQ_SENT:
2312 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2313 ib_modify_mad(cm_id_priv->av.port->mad_agent,
34816ad9 2314 cm_id_priv->msg, timeout))
a977049d
HR		 2315 goto out;
2316 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2317 break;
2318 case IB_CM_REP_SENT:
2319 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2320 ib_modify_mad(cm_id_priv->av.port->mad_agent,
34816ad9 2321 cm_id_priv->msg, timeout))
a977049d
HR		 2322 goto out;
2323 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2324 break;
2325 case IB_CM_ESTABLISHED:
2326 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2327 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2328 ib_modify_mad(cm_id_priv->av.port->mad_agent,
34816ad9 2329 cm_id_priv->msg, timeout))
a977049d
HR		 2330 goto out;
2331 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2332 break;
2333 default:
2334 goto out;
2335 }
2336
2337 cm_id_priv->msg->context[1] = (void *) (unsigned long)
2338 cm_id_priv->id.state;
2339 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2340 if (!ret)
2341 list_add_tail(&work->list, &cm_id_priv->work_list);
2342 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2343
2344 if (ret)
2345 cm_process_work(cm_id_priv, work);
2346 else
2347 cm_deref_id(cm_id_priv);
2348 return 0;
2349out:
2350 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2351 cm_deref_id(cm_id_priv);
2352 return -EINVAL;
2353}
2354
2355static void cm_format_lap(struct cm_lap_msg *lap_msg,
2356 struct cm_id_private *cm_id_priv,
2357 struct ib_sa_path_rec *alternate_path,
2358 const void *private_data,
2359 u8 private_data_len)
2360{
2361 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2362 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2363 lap_msg->local_comm_id = cm_id_priv->id.local_id;
2364 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2365 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2366 /* todo: need remote CM response timeout */
2367 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2368 lap_msg->alt_local_lid = alternate_path->slid;
2369 lap_msg->alt_remote_lid = alternate_path->dlid;
2370 lap_msg->alt_local_gid = alternate_path->sgid;
2371 lap_msg->alt_remote_gid = alternate_path->dgid;
2372 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2373 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2374 lap_msg->alt_hop_limit = alternate_path->hop_limit;
2375 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2376 cm_lap_set_sl(lap_msg, alternate_path->sl);
2377 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2378 cm_lap_set_local_ack_timeout(lap_msg,
2379 min(31, alternate_path->packet_life_time + 1));
2380
2381 if (private_data && private_data_len)
2382 memcpy(lap_msg->private_data, private_data, private_data_len);
2383}
2384
2385int ib_send_cm_lap(struct ib_cm_id *cm_id,
2386 struct ib_sa_path_rec *alternate_path,
2387 const void *private_data,
2388 u8 private_data_len)
2389{
2390 struct cm_id_private *cm_id_priv;
2391 struct ib_mad_send_buf *msg;
a977049d
HR		 2392 unsigned long flags;
2393 int ret;
2394
2395 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2396 return -EINVAL;
2397
2398 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2399 spin_lock_irqsave(&cm_id_priv->lock, flags);
2400 if (cm_id->state != IB_CM_ESTABLISHED ||
e1444b5a
SH		 2401 (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2402 cm_id->lap_state != IB_CM_LAP_IDLE)) {
a977049d
HR		 2403 ret = -EINVAL;
2404 goto out;
2405 }
2406
e1444b5a
SH		 2407 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
2408 if (ret)
2409 goto out;
2410
a977049d
HR		 2411 ret = cm_alloc_msg(cm_id_priv, &msg);
2412 if (ret)
2413 goto out;
2414
2415 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2416 alternate_path, private_data, private_data_len);
34816ad9 2417 msg->timeout_ms = cm_id_priv->timeout_ms;
a977049d
HR		 2418 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2419
34816ad9 2420 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 2421 if (ret) {
2422 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2423 cm_free_msg(msg);
2424 return ret;
2425 }
2426
2427 cm_id->lap_state = IB_CM_LAP_SENT;
2428 cm_id_priv->msg = msg;
2429
2430out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2431 return ret;
2432}
2433EXPORT_SYMBOL(ib_send_cm_lap);
2434
e1444b5a
SH		 2435static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2436 struct ib_sa_path_rec *path,
a977049d
HR		 2437 struct cm_lap_msg *lap_msg)
2438{
2439 memset(path, 0, sizeof *path);
2440 path->dgid = lap_msg->alt_local_gid;
2441 path->sgid = lap_msg->alt_remote_gid;
2442 path->dlid = lap_msg->alt_local_lid;
2443 path->slid = lap_msg->alt_remote_lid;
2444 path->flow_label = cm_lap_get_flow_label(lap_msg);
2445 path->hop_limit = lap_msg->alt_hop_limit;
2446 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2447 path->reversible = 1;
e1444b5a 2448 path->pkey = cm_id_priv->pkey;
a977049d
HR		 2449 path->sl = cm_lap_get_sl(lap_msg);
2450 path->mtu_selector = IB_SA_EQ;
e1444b5a 2451 path->mtu = cm_id_priv->path_mtu;
a977049d
HR		 2452 path->rate_selector = IB_SA_EQ;
2453 path->rate = cm_lap_get_packet_rate(lap_msg);
2454 path->packet_life_time_selector = IB_SA_EQ;
2455 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2456 path->packet_life_time -= (path->packet_life_time > 0);
2457}
2458
2459static int cm_lap_handler(struct cm_work *work)
2460{
2461 struct cm_id_private *cm_id_priv;
2462 struct cm_lap_msg *lap_msg;
2463 struct ib_cm_lap_event_param *param;
2464 struct ib_mad_send_buf *msg = NULL;
a977049d
HR		 2465 unsigned long flags;
2466 int ret;
2467
2468 /* todo: verify LAP request and send reject APR if invalid. */
2469 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2470 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2471 lap_msg->local_comm_id);
2472 if (!cm_id_priv)
2473 return -EINVAL;
2474
2475 param = &work->cm_event.param.lap_rcvd;
2476 param->alternate_path = &work->path[0];
e1444b5a 2477 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
a977049d
HR		 2478 work->cm_event.private_data = &lap_msg->private_data;
2479
2480 spin_lock_irqsave(&cm_id_priv->lock, flags);
2481 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2482 goto unlock;
2483
2484 switch (cm_id_priv->id.lap_state) {
e1444b5a 2485 case IB_CM_LAP_UNINIT:
a977049d
HR		 2486 case IB_CM_LAP_IDLE:
2487 break;
2488 case IB_CM_MRA_LAP_SENT:
2489 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2490 goto unlock;
2491
2492 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2493 CM_MSG_RESPONSE_OTHER,
2494 cm_id_priv->service_timeout,
2495 cm_id_priv->private_data,
2496 cm_id_priv->private_data_len);
2497 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2498
34816ad9 2499 if (ib_post_send_mad(msg, NULL))
a977049d
HR		 2500 cm_free_msg(msg);
2501 goto deref;
2502 default:
2503 goto unlock;
2504 }
2505
2506 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2507 cm_id_priv->tid = lap_msg->hdr.tid;
e1444b5a
SH		 2508 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2509 work->mad_recv_wc->recv_buf.grh,
2510 &cm_id_priv->av);
2511 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
a977049d
HR		 2512 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2513 if (!ret)
2514 list_add_tail(&work->list, &cm_id_priv->work_list);
2515 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2516
2517 if (ret)
2518 cm_process_work(cm_id_priv, work);
2519 else
2520 cm_deref_id(cm_id_priv);
2521 return 0;
2522
2523unlock: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2524deref: cm_deref_id(cm_id_priv);
2525 return -EINVAL;
2526}
2527
2528static void cm_format_apr(struct cm_apr_msg *apr_msg,
2529 struct cm_id_private *cm_id_priv,
2530 enum ib_cm_apr_status status,
2531 void *info,
2532 u8 info_length,
2533 const void *private_data,
2534 u8 private_data_len)
2535{
2536 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2537 apr_msg->local_comm_id = cm_id_priv->id.local_id;
2538 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2539 apr_msg->ap_status = (u8) status;
2540
2541 if (info && info_length) {
2542 apr_msg->info_length = info_length;
2543 memcpy(apr_msg->info, info, info_length);
2544 }
2545
2546 if (private_data && private_data_len)
2547 memcpy(apr_msg->private_data, private_data, private_data_len);
2548}
2549
2550int ib_send_cm_apr(struct ib_cm_id *cm_id,
2551 enum ib_cm_apr_status status,
2552 void *info,
2553 u8 info_length,
2554 const void *private_data,
2555 u8 private_data_len)
2556{
2557 struct cm_id_private *cm_id_priv;
2558 struct ib_mad_send_buf *msg;
a977049d
HR		 2559 unsigned long flags;
2560 int ret;
2561
2562 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2563 (info && info_length > IB_CM_APR_INFO_LENGTH))
2564 return -EINVAL;
2565
2566 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2567 spin_lock_irqsave(&cm_id_priv->lock, flags);
2568 if (cm_id->state != IB_CM_ESTABLISHED ||
2569 (cm_id->lap_state != IB_CM_LAP_RCVD &&
2570 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2571 ret = -EINVAL;
2572 goto out;
2573 }
2574
2575 ret = cm_alloc_msg(cm_id_priv, &msg);
2576 if (ret)
2577 goto out;
2578
2579 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2580 info, info_length, private_data, private_data_len);
34816ad9 2581 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 2582 if (ret) {
2583 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2584 cm_free_msg(msg);
2585 return ret;
2586 }
2587
2588 cm_id->lap_state = IB_CM_LAP_IDLE;
2589out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2590 return ret;
2591}
2592EXPORT_SYMBOL(ib_send_cm_apr);
2593
2594static int cm_apr_handler(struct cm_work *work)
2595{
2596 struct cm_id_private *cm_id_priv;
2597 struct cm_apr_msg *apr_msg;
2598 unsigned long flags;
2599 int ret;
2600
2601 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2602 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2603 apr_msg->local_comm_id);
2604 if (!cm_id_priv)
2605 return -EINVAL; /* Unmatched reply. */
2606
2607 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2608 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2609 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2610 work->cm_event.private_data = &apr_msg->private_data;
2611
2612 spin_lock_irqsave(&cm_id_priv->lock, flags);
2613 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2614 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2615 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2616 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2617 goto out;
2618 }
2619 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
34816ad9 2620 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d
HR		 2621 cm_id_priv->msg = NULL;
2622
2623 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2624 if (!ret)
2625 list_add_tail(&work->list, &cm_id_priv->work_list);
2626 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2627
2628 if (ret)
2629 cm_process_work(cm_id_priv, work);
2630 else
2631 cm_deref_id(cm_id_priv);
2632 return 0;
2633out:
2634 cm_deref_id(cm_id_priv);
2635 return -EINVAL;
2636}
2637
2638static int cm_timewait_handler(struct cm_work *work)
2639{
2640 struct cm_timewait_info *timewait_info;
2641 struct cm_id_private *cm_id_priv;
a977049d
HR		 2642 int ret;
2643
2644 timewait_info = (struct cm_timewait_info *)work;
8575329d
SH		 2645 spin_lock_irq(&cm.lock);
2646 list_del(&timewait_info->list);
2647 spin_unlock_irq(&cm.lock);
a977049d
HR		 2648
2649 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2650 timewait_info->work.remote_id);
2651 if (!cm_id_priv)
2652 return -EINVAL;
2653
8575329d 2654 spin_lock_irq(&cm_id_priv->lock);
a977049d
HR		 2655 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2656 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
8575329d 2657 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 2658 goto out;
2659 }
2660 cm_id_priv->id.state = IB_CM_IDLE;
2661 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2662 if (!ret)
2663 list_add_tail(&work->list, &cm_id_priv->work_list);
8575329d 2664 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 2665
2666 if (ret)
2667 cm_process_work(cm_id_priv, work);
2668 else
2669 cm_deref_id(cm_id_priv);
2670 return 0;
2671out:
2672 cm_deref_id(cm_id_priv);
2673 return -EINVAL;
2674}
2675
2676static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2677 struct cm_id_private *cm_id_priv,
2678 struct ib_cm_sidr_req_param *param)
2679{
2680 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2681 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2682 sidr_req_msg->request_id = cm_id_priv->id.local_id;
75af9088 2683 sidr_req_msg->pkey = cpu_to_be16(param->path->pkey);
a977049d
HR		 2684 sidr_req_msg->service_id = param->service_id;
2685
2686 if (param->private_data && param->private_data_len)
2687 memcpy(sidr_req_msg->private_data, param->private_data,
2688 param->private_data_len);
2689}
2690
2691int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2692 struct ib_cm_sidr_req_param *param)
2693{
2694 struct cm_id_private *cm_id_priv;
2695 struct ib_mad_send_buf *msg;
a977049d
HR		 2696 unsigned long flags;
2697 int ret;
2698
2699 if (!param->path || (param->private_data &&
2700 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2701 return -EINVAL;
2702
2703 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2704 ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2705 if (ret)
2706 goto out;
2707
2708 cm_id->service_id = param->service_id;
97f52eb4 2709 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
a977049d
HR		 2710 cm_id_priv->timeout_ms = param->timeout_ms;
2711 cm_id_priv->max_cm_retries = param->max_cm_retries;
2712 ret = cm_alloc_msg(cm_id_priv, &msg);
2713 if (ret)
2714 goto out;
2715
2716 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2717 param);
34816ad9 2718 msg->timeout_ms = cm_id_priv->timeout_ms;
a977049d
HR		 2719 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2720
2721 spin_lock_irqsave(&cm_id_priv->lock, flags);
2722 if (cm_id->state == IB_CM_IDLE)
34816ad9 2723 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 2724 else
2725 ret = -EINVAL;
2726
2727 if (ret) {
2728 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2729 cm_free_msg(msg);
2730 goto out;
2731 }
2732 cm_id->state = IB_CM_SIDR_REQ_SENT;
2733 cm_id_priv->msg = msg;
2734 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2735out:
2736 return ret;
2737}
2738EXPORT_SYMBOL(ib_send_cm_sidr_req);
2739
2740static void cm_format_sidr_req_event(struct cm_work *work,
2741 struct ib_cm_id *listen_id)
2742{
2743 struct cm_sidr_req_msg *sidr_req_msg;
2744 struct ib_cm_sidr_req_event_param *param;
2745
2746 sidr_req_msg = (struct cm_sidr_req_msg *)
2747 work->mad_recv_wc->recv_buf.mad;
2748 param = &work->cm_event.param.sidr_req_rcvd;
97f52eb4 2749 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
a977049d 2750 param->listen_id = listen_id;
a977049d
HR		 2751 param->port = work->port->port_num;
2752 work->cm_event.private_data = &sidr_req_msg->private_data;
2753}
2754
2755static int cm_sidr_req_handler(struct cm_work *work)
2756{
2757 struct ib_cm_id *cm_id;
2758 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2759 struct cm_sidr_req_msg *sidr_req_msg;
2760 struct ib_wc *wc;
2761 unsigned long flags;
2762
07d357d0 2763 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
a977049d
HR		 2764 if (IS_ERR(cm_id))
2765 return PTR_ERR(cm_id);
2766 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2767
2768 /* Record SGID/SLID and request ID for lookup. */
2769 sidr_req_msg = (struct cm_sidr_req_msg *)
2770 work->mad_recv_wc->recv_buf.mad;
2771 wc = work->mad_recv_wc->wc;
97f52eb4 2772 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
a977049d
HR		 2773 cm_id_priv->av.dgid.global.interface_id = 0;
2774 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
ca222c6b 2775 work->mad_recv_wc->recv_buf.grh,
a977049d
HR		 2776 &cm_id_priv->av);
2777 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2778 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
2779 cm_id_priv->tid = sidr_req_msg->hdr.tid;
2780 atomic_inc(&cm_id_priv->work_count);
2781
2782 spin_lock_irqsave(&cm.lock, flags);
2783 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2784 if (cur_cm_id_priv) {
2785 spin_unlock_irqrestore(&cm.lock, flags);
2786 goto out; /* Duplicate message. */
2787 }
07d357d0 2788 cur_cm_id_priv = cm_find_listen(cm_id->device,
6e61d04f
SH		 2789 sidr_req_msg->service_id,
2790 sidr_req_msg->private_data);
a977049d
HR		 2791 if (!cur_cm_id_priv) {
2792 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2793 spin_unlock_irqrestore(&cm.lock, flags);
2794 /* todo: reply with no match */
2795 goto out; /* No match. */
2796 }
2797 atomic_inc(&cur_cm_id_priv->refcount);
2798 spin_unlock_irqrestore(&cm.lock, flags);
2799
2800 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2801 cm_id_priv->id.context = cur_cm_id_priv->id.context;
2802 cm_id_priv->id.service_id = sidr_req_msg->service_id;
97f52eb4 2803 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
a977049d
HR		 2804
2805 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2806 cm_process_work(cm_id_priv, work);
2807 cm_deref_id(cur_cm_id_priv);
2808 return 0;
2809out:
2810 ib_destroy_cm_id(&cm_id_priv->id);
2811 return -EINVAL;
2812}
2813
2814static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2815 struct cm_id_private *cm_id_priv,
2816 struct ib_cm_sidr_rep_param *param)
2817{
2818 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2819 cm_id_priv->tid);
2820 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2821 sidr_rep_msg->status = param->status;
2822 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2823 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2824 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2825
2826 if (param->info && param->info_length)
2827 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2828
2829 if (param->private_data && param->private_data_len)
2830 memcpy(sidr_rep_msg->private_data, param->private_data,
2831 param->private_data_len);
2832}
2833
2834int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2835 struct ib_cm_sidr_rep_param *param)
2836{
2837 struct cm_id_private *cm_id_priv;
2838 struct ib_mad_send_buf *msg;
a977049d
HR		 2839 unsigned long flags;
2840 int ret;
2841
2842 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2843 (param->private_data &&
2844 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2845 return -EINVAL;
2846
2847 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2848 spin_lock_irqsave(&cm_id_priv->lock, flags);
2849 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2850 ret = -EINVAL;
2851 goto error;
2852 }
2853
2854 ret = cm_alloc_msg(cm_id_priv, &msg);
2855 if (ret)
2856 goto error;
2857
2858 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2859 param);
34816ad9 2860 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 2861 if (ret) {
2862 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2863 cm_free_msg(msg);
2864 return ret;
2865 }
2866 cm_id->state = IB_CM_IDLE;
2867 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2868
2869 spin_lock_irqsave(&cm.lock, flags);
2870 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2871 spin_unlock_irqrestore(&cm.lock, flags);
2872 return 0;
2873
2874error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2875 return ret;
2876}
2877EXPORT_SYMBOL(ib_send_cm_sidr_rep);
2878
2879static void cm_format_sidr_rep_event(struct cm_work *work)
2880{
2881 struct cm_sidr_rep_msg *sidr_rep_msg;
2882 struct ib_cm_sidr_rep_event_param *param;
2883
2884 sidr_rep_msg = (struct cm_sidr_rep_msg *)
2885 work->mad_recv_wc->recv_buf.mad;
2886 param = &work->cm_event.param.sidr_rep_rcvd;
2887 param->status = sidr_rep_msg->status;
2888 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
2889 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
2890 param->info = &sidr_rep_msg->info;
2891 param->info_len = sidr_rep_msg->info_length;
2892 work->cm_event.private_data = &sidr_rep_msg->private_data;
2893}
2894
2895static int cm_sidr_rep_handler(struct cm_work *work)
2896{
2897 struct cm_sidr_rep_msg *sidr_rep_msg;
2898 struct cm_id_private *cm_id_priv;
2899 unsigned long flags;
2900
2901 sidr_rep_msg = (struct cm_sidr_rep_msg *)
2902 work->mad_recv_wc->recv_buf.mad;
2903 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
2904 if (!cm_id_priv)
2905 return -EINVAL; /* Unmatched reply. */
2906
2907 spin_lock_irqsave(&cm_id_priv->lock, flags);
2908 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
2909 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2910 goto out;
2911 }
2912 cm_id_priv->id.state = IB_CM_IDLE;
34816ad9 2913 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d
HR		 2914 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2915
2916 cm_format_sidr_rep_event(work);
2917 cm_process_work(cm_id_priv, work);
2918 return 0;
2919out:
2920 cm_deref_id(cm_id_priv);
2921 return -EINVAL;
2922}
2923
2924static void cm_process_send_error(struct ib_mad_send_buf *msg,
2925 enum ib_wc_status wc_status)
2926{
2927 struct cm_id_private *cm_id_priv;
2928 struct ib_cm_event cm_event;
2929 enum ib_cm_state state;
2930 unsigned long flags;
2931 int ret;
2932
2933 memset(&cm_event, 0, sizeof cm_event);
2934 cm_id_priv = msg->context[0];
2935
2936 /* Discard old sends or ones without a response. */
2937 spin_lock_irqsave(&cm_id_priv->lock, flags);
2938 state = (enum ib_cm_state) (unsigned long) msg->context[1];
2939 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
2940 goto discard;
2941
2942 switch (state) {
2943 case IB_CM_REQ_SENT:
2944 case IB_CM_MRA_REQ_RCVD:
2945 cm_reset_to_idle(cm_id_priv);
2946 cm_event.event = IB_CM_REQ_ERROR;
2947 break;
2948 case IB_CM_REP_SENT:
2949 case IB_CM_MRA_REP_RCVD:
2950 cm_reset_to_idle(cm_id_priv);
2951 cm_event.event = IB_CM_REP_ERROR;
2952 break;
2953 case IB_CM_DREQ_SENT:
2954 cm_enter_timewait(cm_id_priv);
2955 cm_event.event = IB_CM_DREQ_ERROR;
2956 break;
2957 case IB_CM_SIDR_REQ_SENT:
2958 cm_id_priv->id.state = IB_CM_IDLE;
2959 cm_event.event = IB_CM_SIDR_REQ_ERROR;
2960 break;
2961 default:
2962 goto discard;
2963 }
2964 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2965 cm_event.param.send_status = wc_status;
2966
2967 /* No other events can occur on the cm_id at this point. */
2968 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
2969 cm_free_msg(msg);
2970 if (ret)
2971 ib_destroy_cm_id(&cm_id_priv->id);
2972 return;
2973discard:
2974 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2975 cm_free_msg(msg);
2976}
2977
2978static void cm_send_handler(struct ib_mad_agent *mad_agent,
2979 struct ib_mad_send_wc *mad_send_wc)
2980{
34816ad9 2981 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
a977049d
HR		 2982
2983 switch (mad_send_wc->status) {
2984 case IB_WC_SUCCESS:
2985 case IB_WC_WR_FLUSH_ERR:
2986 cm_free_msg(msg);
2987 break;
2988 default:
2989 if (msg->context[0] && msg->context[1])
2990 cm_process_send_error(msg, mad_send_wc->status);
2991 else
2992 cm_free_msg(msg);
2993 break;
2994 }
2995}
2996
c4028958 2997static void cm_work_handler(struct work_struct *_work)
a977049d 2998{
c4028958 2999 struct cm_work *work = container_of(_work, struct cm_work, work.work);
a977049d
HR		 3000 int ret;
3001
3002 switch (work->cm_event.event) {
3003 case IB_CM_REQ_RECEIVED:
3004 ret = cm_req_handler(work);
3005 break;
3006 case IB_CM_MRA_RECEIVED:
3007 ret = cm_mra_handler(work);
3008 break;
3009 case IB_CM_REJ_RECEIVED:
3010 ret = cm_rej_handler(work);
3011 break;
3012 case IB_CM_REP_RECEIVED:
3013 ret = cm_rep_handler(work);
3014 break;
3015 case IB_CM_RTU_RECEIVED:
3016 ret = cm_rtu_handler(work);
3017 break;
3018 case IB_CM_USER_ESTABLISHED:
3019 ret = cm_establish_handler(work);
3020 break;
3021 case IB_CM_DREQ_RECEIVED:
3022 ret = cm_dreq_handler(work);
3023 break;
3024 case IB_CM_DREP_RECEIVED:
3025 ret = cm_drep_handler(work);
3026 break;
3027 case IB_CM_SIDR_REQ_RECEIVED:
3028 ret = cm_sidr_req_handler(work);
3029 break;
3030 case IB_CM_SIDR_REP_RECEIVED:
3031 ret = cm_sidr_rep_handler(work);
3032 break;
3033 case IB_CM_LAP_RECEIVED:
3034 ret = cm_lap_handler(work);
3035 break;
3036 case IB_CM_APR_RECEIVED:
3037 ret = cm_apr_handler(work);
3038 break;
3039 case IB_CM_TIMEWAIT_EXIT:
3040 ret = cm_timewait_handler(work);
3041 break;
3042 default:
3043 ret = -EINVAL;
3044 break;
3045 }
3046 if (ret)
3047 cm_free_work(work);
3048}
3049
e1444b5a 3050static int cm_establish(struct ib_cm_id *cm_id)
a977049d
HR		 3051{
3052 struct cm_id_private *cm_id_priv;
3053 struct cm_work *work;
3054 unsigned long flags;
3055 int ret = 0;
3056
3057 work = kmalloc(sizeof *work, GFP_ATOMIC);
3058 if (!work)
3059 return -ENOMEM;
3060
3061 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3062 spin_lock_irqsave(&cm_id_priv->lock, flags);
3063 switch (cm_id->state)
3064 {
3065 case IB_CM_REP_SENT:
3066 case IB_CM_MRA_REP_RCVD:
3067 cm_id->state = IB_CM_ESTABLISHED;
3068 break;
3069 case IB_CM_ESTABLISHED:
3070 ret = -EISCONN;
3071 break;
3072 default:
3073 ret = -EINVAL;
3074 break;
3075 }
3076 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3077
3078 if (ret) {
3079 kfree(work);
3080 goto out;
3081 }
3082
3083 /*
3084 * The CM worker thread may try to destroy the cm_id before it
3085 * can execute this work item. To prevent potential deadlock,
3086 * we need to find the cm_id once we're in the context of the
3087 * worker thread, rather than holding a reference on it.
3088 */
c4028958 3089 INIT_DELAYED_WORK(&work->work, cm_work_handler);
a977049d
HR		 3090 work->local_id = cm_id->local_id;
3091 work->remote_id = cm_id->remote_id;
3092 work->mad_recv_wc = NULL;
3093 work->cm_event.event = IB_CM_USER_ESTABLISHED;
c4028958 3094 queue_delayed_work(cm.wq, &work->work, 0);
a977049d
HR		 3095out:
3096 return ret;
3097}
e1444b5a
SH		 3098
3099static int cm_migrate(struct ib_cm_id *cm_id)
3100{
3101 struct cm_id_private *cm_id_priv;
3102 unsigned long flags;
3103 int ret = 0;
3104
3105 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3106 spin_lock_irqsave(&cm_id_priv->lock, flags);
3107 if (cm_id->state == IB_CM_ESTABLISHED &&
3108 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3109 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3110 cm_id->lap_state = IB_CM_LAP_IDLE;
3111 cm_id_priv->av = cm_id_priv->alt_av;
3112 } else
3113 ret = -EINVAL;
3114 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3115
3116 return ret;
3117}
3118
3119int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3120{
3121 int ret;
3122
3123 switch (event) {
3124 case IB_EVENT_COMM_EST:
3125 ret = cm_establish(cm_id);
3126 break;
3127 case IB_EVENT_PATH_MIG:
3128 ret = cm_migrate(cm_id);
3129 break;
3130 default:
3131 ret = -EINVAL;
3132 }
3133 return ret;
3134}
3135EXPORT_SYMBOL(ib_cm_notify);
a977049d
HR		 3136
3137static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3138 struct ib_mad_recv_wc *mad_recv_wc)
3139{
3140 struct cm_work *work;
3141 enum ib_cm_event_type event;
3142 int paths = 0;
3143
3144 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3145 case CM_REQ_ATTR_ID:
3146 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3147 alt_local_lid != 0);
3148 event = IB_CM_REQ_RECEIVED;
3149 break;
3150 case CM_MRA_ATTR_ID:
3151 event = IB_CM_MRA_RECEIVED;
3152 break;
3153 case CM_REJ_ATTR_ID:
3154 event = IB_CM_REJ_RECEIVED;
3155 break;
3156 case CM_REP_ATTR_ID:
3157 event = IB_CM_REP_RECEIVED;
3158 break;
3159 case CM_RTU_ATTR_ID:
3160 event = IB_CM_RTU_RECEIVED;
3161 break;
3162 case CM_DREQ_ATTR_ID:
3163 event = IB_CM_DREQ_RECEIVED;
3164 break;
3165 case CM_DREP_ATTR_ID:
3166 event = IB_CM_DREP_RECEIVED;
3167 break;
3168 case CM_SIDR_REQ_ATTR_ID:
3169 event = IB_CM_SIDR_REQ_RECEIVED;
3170 break;
3171 case CM_SIDR_REP_ATTR_ID:
3172 event = IB_CM_SIDR_REP_RECEIVED;
3173 break;
3174 case CM_LAP_ATTR_ID:
3175 paths = 1;
3176 event = IB_CM_LAP_RECEIVED;
3177 break;
3178 case CM_APR_ATTR_ID:
3179 event = IB_CM_APR_RECEIVED;
3180 break;
3181 default:
3182 ib_free_recv_mad(mad_recv_wc);
3183 return;
3184 }
3185
3186 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3187 GFP_KERNEL);
3188 if (!work) {
3189 ib_free_recv_mad(mad_recv_wc);
3190 return;
3191 }
3192
c4028958 3193 INIT_DELAYED_WORK(&work->work, cm_work_handler);
a977049d
HR		 3194 work->cm_event.event = event;
3195 work->mad_recv_wc = mad_recv_wc;
3196 work->port = (struct cm_port *)mad_agent->context;
c4028958 3197 queue_delayed_work(cm.wq, &work->work, 0);
a977049d
HR		 3198}
3199
3200static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3201 struct ib_qp_attr *qp_attr,
3202 int *qp_attr_mask)
3203{
3204 unsigned long flags;
3205 int ret;
3206
3207 spin_lock_irqsave(&cm_id_priv->lock, flags);
3208 switch (cm_id_priv->id.state) {
3209 case IB_CM_REQ_SENT:
3210 case IB_CM_MRA_REQ_RCVD:
3211 case IB_CM_REQ_RCVD:
3212 case IB_CM_MRA_REQ_SENT:
3213 case IB_CM_REP_RCVD:
3214 case IB_CM_MRA_REP_SENT:
3215 case IB_CM_REP_SENT:
3216 case IB_CM_MRA_REP_RCVD:
3217 case IB_CM_ESTABLISHED:
3218 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3219 IB_QP_PKEY_INDEX | IB_QP_PORT;
e31353ea 3220 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
a977049d 3221 if (cm_id_priv->responder_resources)
c1f250c0
SH		 3222 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3223 IB_ACCESS_REMOTE_ATOMIC;
a977049d
HR		 3224 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3225 qp_attr->port_num = cm_id_priv->av.port->port_num;
3226 ret = 0;
3227 break;
3228 default:
3229 ret = -EINVAL;
3230 break;
3231 }
3232 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3233 return ret;
3234}
3235
3236static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3237 struct ib_qp_attr *qp_attr,
3238 int *qp_attr_mask)
3239{
3240 unsigned long flags;
3241 int ret;
3242
3243 spin_lock_irqsave(&cm_id_priv->lock, flags);
3244 switch (cm_id_priv->id.state) {
3245 case IB_CM_REQ_RCVD:
3246 case IB_CM_MRA_REQ_SENT:
3247 case IB_CM_REP_RCVD:
3248 case IB_CM_MRA_REP_SENT:
3249 case IB_CM_REP_SENT:
3250 case IB_CM_MRA_REP_RCVD:
3251 case IB_CM_ESTABLISHED:
3252 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
ae7971a7 3253 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
a977049d
HR		 3254 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3255 qp_attr->path_mtu = cm_id_priv->path_mtu;
3256 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3257 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
ae7971a7
SH		 3258 if (cm_id_priv->qp_type == IB_QPT_RC) {
3259 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3260 IB_QP_MIN_RNR_TIMER;
3261 qp_attr->max_dest_rd_atomic =
3262 cm_id_priv->responder_resources;
3263 qp_attr->min_rnr_timer = 0;
3264 }
a977049d
HR		 3265 if (cm_id_priv->alt_av.ah_attr.dlid) {
3266 *qp_attr_mask |= IB_QP_ALT_PATH;
0d8fdfd7 3267 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
e1444b5a
SH		 3268 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3269 qp_attr->alt_timeout =
3270 cm_id_priv->alt_av.packet_life_time + 1;
a977049d
HR		 3271 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3272 }
3273 ret = 0;
3274 break;
3275 default:
3276 ret = -EINVAL;
3277 break;
3278 }
3279 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3280 return ret;
3281}
3282
3283static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3284 struct ib_qp_attr *qp_attr,
3285 int *qp_attr_mask)
3286{
3287 unsigned long flags;
3288 int ret;
3289
3290 spin_lock_irqsave(&cm_id_priv->lock, flags);
3291 switch (cm_id_priv->id.state) {
0fe313b0
SH		 3292 /* Allow transition to RTS before sending REP */
3293 case IB_CM_REQ_RCVD:
3294 case IB_CM_MRA_REQ_SENT:
3295
a977049d
HR		 3296 case IB_CM_REP_RCVD:
3297 case IB_CM_MRA_REP_SENT:
3298 case IB_CM_REP_SENT:
3299 case IB_CM_MRA_REP_RCVD:
3300 case IB_CM_ESTABLISHED:
e1444b5a
SH		 3301 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
3302 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3303 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3304 if (cm_id_priv->qp_type == IB_QPT_RC) {
3305 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3306 IB_QP_RNR_RETRY |
3307 IB_QP_MAX_QP_RD_ATOMIC;
3308 qp_attr->timeout =
3309 cm_id_priv->av.packet_life_time + 1;
3310 qp_attr->retry_cnt = cm_id_priv->retry_count;
3311 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3312 qp_attr->max_rd_atomic =
3313 cm_id_priv->initiator_depth;
3314 }
3315 if (cm_id_priv->alt_av.ah_attr.dlid) {
3316 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3317 qp_attr->path_mig_state = IB_MIG_REARM;
3318 }
3319 } else {
3320 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
3321 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3322 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3323 qp_attr->alt_timeout =
3324 cm_id_priv->alt_av.packet_life_time + 1;
3325 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
a977049d
HR		 3326 qp_attr->path_mig_state = IB_MIG_REARM;
3327 }
3328 ret = 0;
3329 break;
3330 default:
3331 ret = -EINVAL;
3332 break;
3333 }
3334 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3335 return ret;
3336}
3337
3338int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3339 struct ib_qp_attr *qp_attr,
3340 int *qp_attr_mask)
3341{
3342 struct cm_id_private *cm_id_priv;
3343 int ret;
3344
3345 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3346 switch (qp_attr->qp_state) {
3347 case IB_QPS_INIT:
3348 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3349 break;
3350 case IB_QPS_RTR:
3351 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3352 break;
3353 case IB_QPS_RTS:
3354 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3355 break;
3356 default:
3357 ret = -EINVAL;
3358 break;
3359 }
3360 return ret;
3361}
3362EXPORT_SYMBOL(ib_cm_init_qp_attr);
3363
a977049d
HR		 3364static void cm_add_one(struct ib_device *device)
3365{
3366 struct cm_device *cm_dev;
3367 struct cm_port *port;
3368 struct ib_mad_reg_req reg_req = {
3369 .mgmt_class = IB_MGMT_CLASS_CM,
3370 .mgmt_class_version = IB_CM_CLASS_VERSION
3371 };
3372 struct ib_port_modify port_modify = {
3373 .set_port_cap_mask = IB_PORT_CM_SUP
3374 };
3375 unsigned long flags;
3376 int ret;
3377 u8 i;
3378
07ebafba
TT		 3379 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
3380 return;
3381
a977049d
HR		 3382 cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
3383 device->phys_port_cnt, GFP_KERNEL);
3384 if (!cm_dev)
3385 return;
3386
3387 cm_dev->device = device;
a977049d
HR		 3388
3389 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3390 for (i = 1; i <= device->phys_port_cnt; i++) {
3391 port = &cm_dev->port[i-1];
3392 port->cm_dev = cm_dev;
3393 port->port_num = i;
3394 port->mad_agent = ib_register_mad_agent(device, i,
3395 IB_QPT_GSI,
3396 &reg_req,
3397 0,
3398 cm_send_handler,
3399 cm_recv_handler,
3400 port);
3401 if (IS_ERR(port->mad_agent))
cf311cd4 3402 goto error1;
a977049d
HR		 3403
3404 ret = ib_modify_port(device, i, 0, &port_modify);
3405 if (ret)
cf311cd4 3406 goto error2;
a977049d
HR		 3407 }
3408 ib_set_client_data(device, &cm_client, cm_dev);
3409
3410 write_lock_irqsave(&cm.device_lock, flags);
3411 list_add_tail(&cm_dev->list, &cm.device_list);
3412 write_unlock_irqrestore(&cm.device_lock, flags);
3413 return;
3414
a977049d 3415error2:
cf311cd4
SH		 3416 ib_unregister_mad_agent(port->mad_agent);
3417error1:
a977049d
HR		 3418 port_modify.set_port_cap_mask = 0;
3419 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3420 while (--i) {
3421 port = &cm_dev->port[i-1];
3422 ib_modify_port(device, port->port_num, 0, &port_modify);
3423 ib_unregister_mad_agent(port->mad_agent);
3424 }
a977049d
HR		 3425 kfree(cm_dev);
3426}
3427
3428static void cm_remove_one(struct ib_device *device)
3429{
3430 struct cm_device *cm_dev;
3431 struct cm_port *port;
3432 struct ib_port_modify port_modify = {
3433 .clr_port_cap_mask = IB_PORT_CM_SUP
3434 };
3435 unsigned long flags;
3436 int i;
3437
3438 cm_dev = ib_get_client_data(device, &cm_client);
3439 if (!cm_dev)
3440 return;
3441
3442 write_lock_irqsave(&cm.device_lock, flags);
3443 list_del(&cm_dev->list);
3444 write_unlock_irqrestore(&cm.device_lock, flags);
3445
3446 for (i = 1; i <= device->phys_port_cnt; i++) {
3447 port = &cm_dev->port[i-1];
3448 ib_modify_port(device, port->port_num, 0, &port_modify);
3449 ib_unregister_mad_agent(port->mad_agent);
3450 }
3451 kfree(cm_dev);
3452}
3453
3454static int __init ib_cm_init(void)
3455{
3456 int ret;
3457
3458 memset(&cm, 0, sizeof cm);
3459 INIT_LIST_HEAD(&cm.device_list);
3460 rwlock_init(&cm.device_lock);
3461 spin_lock_init(&cm.lock);
3462 cm.listen_service_table = RB_ROOT;
3463 cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3464 cm.remote_id_table = RB_ROOT;
3465 cm.remote_qp_table = RB_ROOT;
3466 cm.remote_sidr_table = RB_ROOT;
3467 idr_init(&cm.local_id_table);
f06d2653 3468 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
a977049d 3469 idr_pre_get(&cm.local_id_table, GFP_KERNEL);
8575329d 3470 INIT_LIST_HEAD(&cm.timewait_list);
a977049d
HR		 3471
3472 cm.wq = create_workqueue("ib_cm");
3473 if (!cm.wq)
3474 return -ENOMEM;
3475
3476 ret = ib_register_client(&cm_client);
3477 if (ret)
3478 goto error;
3479
3480 return 0;
3481error:
3482 destroy_workqueue(cm.wq);
3483 return ret;
3484}
3485
3486static void __exit ib_cm_cleanup(void)
3487{
8575329d
SH		 3488 struct cm_timewait_info *timewait_info, *tmp;
3489
3490 spin_lock_irq(&cm.lock);
3491 list_for_each_entry(timewait_info, &cm.timewait_list, list)
3492 cancel_delayed_work(&timewait_info->work.work);
3493 spin_unlock_irq(&cm.lock);
3494
a977049d 3495 destroy_workqueue(cm.wq);
8575329d
SH		 3496
3497 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
3498 list_del(&timewait_info->list);
3499 kfree(timewait_info);
3500 }
3501
a977049d 3502 ib_unregister_client(&cm_client);
5d7edb3c 3503 idr_destroy(&cm.local_id_table);
a977049d
HR		 3504}
3505
3506module_init(ib_cm_init);
3507module_exit(ib_cm_cleanup);
3508
Linux kernel - Deliverables
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