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IB/cm: Fix handling of duplicate SIDR REQs
[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;
1d846126 90 u8 ack_delay;
a977049d
HR		 91 struct cm_port port[0];
92};
93
94struct cm_av {
95 struct cm_port *port;
96 union ib_gid dgid;
97 struct ib_ah_attr ah_attr;
98 u16 pkey_index;
1d846126 99 u8 timeout;
a977049d
HR		 100};
101
102struct cm_work {
c4028958 103 struct delayed_work work;
a977049d
HR		 104 struct list_head list;
105 struct cm_port *port;
106 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
97f52eb4
SH		 107 __be32 local_id; /* Established / timewait */
108 __be32 remote_id;
a977049d
HR		 109 struct ib_cm_event cm_event;
110 struct ib_sa_path_rec path[0];
111};
112
113struct cm_timewait_info {
114 struct cm_work work; /* Must be first. */
8575329d 115 struct list_head list;
a977049d
HR		 116 struct rb_node remote_qp_node;
117 struct rb_node remote_id_node;
97f52eb4
SH		 118 __be64 remote_ca_guid;
119 __be32 remote_qpn;
a977049d
HR		 120 u8 inserted_remote_qp;
121 u8 inserted_remote_id;
122};
123
124struct cm_id_private {
125 struct ib_cm_id id;
126
127 struct rb_node service_node;
128 struct rb_node sidr_id_node;
87fd1a11 129 spinlock_t lock; /* Do not acquire inside cm.lock */
1b52fa98 130 struct completion comp;
a977049d
HR		 131 atomic_t refcount;
132
133 struct ib_mad_send_buf *msg;
134 struct cm_timewait_info *timewait_info;
135 /* todo: use alternate port on send failure */
136 struct cm_av av;
137 struct cm_av alt_av;
6e61d04f 138 struct ib_cm_compare_data *compare_data;
a977049d
HR		 139
140 void *private_data;
97f52eb4
SH		 141 __be64 tid;
142 __be32 local_qpn;
143 __be32 remote_qpn;
ae7971a7 144 enum ib_qp_type qp_type;
97f52eb4
SH		 145 __be32 sq_psn;
146 __be32 rq_psn;
a977049d
HR		 147 int timeout_ms;
148 enum ib_mtu path_mtu;
e1444b5a 149 __be16 pkey;
a977049d
HR		 150 u8 private_data_len;
151 u8 max_cm_retries;
152 u8 peer_to_peer;
153 u8 responder_resources;
154 u8 initiator_depth;
a977049d
HR		 155 u8 retry_count;
156 u8 rnr_retry_count;
157 u8 service_timeout;
1d846126 158 u8 target_ack_delay;
a977049d
HR		 159
160 struct list_head work_list;
161 atomic_t work_count;
162};
163
c4028958 164static void cm_work_handler(struct work_struct *work);
a977049d
HR		 165
166static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
167{
168 if (atomic_dec_and_test(&cm_id_priv->refcount))
1b52fa98 169 complete(&cm_id_priv->comp);
a977049d
HR		 170}
171
172static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
173 struct ib_mad_send_buf **msg)
174{
175 struct ib_mad_agent *mad_agent;
176 struct ib_mad_send_buf *m;
177 struct ib_ah *ah;
178
179 mad_agent = cm_id_priv->av.port->mad_agent;
180 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
181 if (IS_ERR(ah))
182 return PTR_ERR(ah);
183
3cd96564 184 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
354ba39c 185 cm_id_priv->av.pkey_index,
34816ad9 186 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
a977049d
HR		 187 GFP_ATOMIC);
188 if (IS_ERR(m)) {
189 ib_destroy_ah(ah);
190 return PTR_ERR(m);
191 }
192
193 /* Timeout set by caller if response is expected. */
34816ad9
SH		 194 m->ah = ah;
195 m->retries = cm_id_priv->max_cm_retries;
a977049d
HR		 196
197 atomic_inc(&cm_id_priv->refcount);
198 m->context[0] = cm_id_priv;
199 *msg = m;
200 return 0;
201}
202
203static int cm_alloc_response_msg(struct cm_port *port,
204 struct ib_mad_recv_wc *mad_recv_wc,
205 struct ib_mad_send_buf **msg)
206{
207 struct ib_mad_send_buf *m;
208 struct ib_ah *ah;
209
210 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
211 mad_recv_wc->recv_buf.grh, port->port_num);
212 if (IS_ERR(ah))
213 return PTR_ERR(ah);
214
215 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
34816ad9 216 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
a977049d
HR		 217 GFP_ATOMIC);
218 if (IS_ERR(m)) {
219 ib_destroy_ah(ah);
220 return PTR_ERR(m);
221 }
34816ad9 222 m->ah = ah;
a977049d
HR		 223 *msg = m;
224 return 0;
225}
226
227static void cm_free_msg(struct ib_mad_send_buf *msg)
228{
34816ad9 229 ib_destroy_ah(msg->ah);
a977049d
HR		 230 if (msg->context[0])
231 cm_deref_id(msg->context[0]);
232 ib_free_send_mad(msg);
233}
234
235static void * cm_copy_private_data(const void *private_data,
236 u8 private_data_len)
237{
238 void *data;
239
240 if (!private_data || !private_data_len)
241 return NULL;
242
bed8bdfd 243 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
a977049d
HR		 244 if (!data)
245 return ERR_PTR(-ENOMEM);
246
a977049d
HR		 247 return data;
248}
249
250static void cm_set_private_data(struct cm_id_private *cm_id_priv,
251 void *private_data, u8 private_data_len)
252{
253 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
254 kfree(cm_id_priv->private_data);
255
256 cm_id_priv->private_data = private_data;
257 cm_id_priv->private_data_len = private_data_len;
258}
259
ca222c6b
SH		 260static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
261 struct ib_grh *grh, struct cm_av *av)
a977049d
HR		 262{
263 av->port = port;
264 av->pkey_index = wc->pkey_index;
ca222c6b
SH		 265 ib_init_ah_from_wc(port->cm_dev->device, port->port_num, wc,
266 grh, &av->ah_attr);
a977049d
HR		 267}
268
269static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
270{
271 struct cm_device *cm_dev;
272 struct cm_port *port = NULL;
273 unsigned long flags;
274 int ret;
275 u8 p;
276
277 read_lock_irqsave(&cm.device_lock, flags);
278 list_for_each_entry(cm_dev, &cm.device_list, list) {
279 if (!ib_find_cached_gid(cm_dev->device, &path->sgid,
280 &p, NULL)) {
281 port = &cm_dev->port[p-1];
282 break;
283 }
284 }
285 read_unlock_irqrestore(&cm.device_lock, flags);
286
287 if (!port)
288 return -EINVAL;
289
290 ret = ib_find_cached_pkey(cm_dev->device, port->port_num,
291 be16_to_cpu(path->pkey), &av->pkey_index);
292 if (ret)
293 return ret;
294
295 av->port = port;
ca222c6b
SH		 296 ib_init_ah_from_path(cm_dev->device, port->port_num, path,
297 &av->ah_attr);
1d846126 298 av->timeout = path->packet_life_time + 1;
a977049d
HR		 299 return 0;
300}
301
302static int cm_alloc_id(struct cm_id_private *cm_id_priv)
303{
304 unsigned long flags;
f06d2653 305 int ret, id;
de1bb1a6 306 static int next_id;
a977049d
HR		 307
308 do {
309 spin_lock_irqsave(&cm.lock, flags);
f06d2653 310 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv,
9f81036c
MT		 311 next_id, &id);
312 if (!ret)
313 next_id = ((unsigned) id + 1) & MAX_ID_MASK;
a977049d
HR		 314 spin_unlock_irqrestore(&cm.lock, flags);
315 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
f06d2653
SH		 316
317 cm_id_priv->id.local_id = (__force __be32) (id ^ cm.random_id_operand);
a977049d
HR		 318 return ret;
319}
320
97f52eb4 321static void cm_free_id(__be32 local_id)
a977049d 322{
24be6e81 323 spin_lock_irq(&cm.lock);
f06d2653
SH		 324 idr_remove(&cm.local_id_table,
325 (__force int) (local_id ^ cm.random_id_operand));
24be6e81 326 spin_unlock_irq(&cm.lock);
a977049d
HR		 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;
a977049d 348
24be6e81 349 spin_lock_irq(&cm.lock);
a977049d 350 cm_id_priv = cm_get_id(local_id, remote_id);
24be6e81 351 spin_unlock_irq(&cm.lock);
a977049d
HR		 352
353 return cm_id_priv;
354}
355
6e61d04f
SH		 356static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
357{
358 int i;
359
360 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
361 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
362 ((unsigned long *) mask)[i];
363}
364
365static int cm_compare_data(struct ib_cm_compare_data *src_data,
366 struct ib_cm_compare_data *dst_data)
367{
368 u8 src[IB_CM_COMPARE_SIZE];
369 u8 dst[IB_CM_COMPARE_SIZE];
370
371 if (!src_data || !dst_data)
372 return 0;
373
374 cm_mask_copy(src, src_data->data, dst_data->mask);
375 cm_mask_copy(dst, dst_data->data, src_data->mask);
376 return memcmp(src, dst, IB_CM_COMPARE_SIZE);
377}
378
379static int cm_compare_private_data(u8 *private_data,
380 struct ib_cm_compare_data *dst_data)
381{
382 u8 src[IB_CM_COMPARE_SIZE];
383
384 if (!dst_data)
385 return 0;
386
387 cm_mask_copy(src, private_data, dst_data->mask);
388 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
389}
390
a977049d
HR		 391static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
392{
393 struct rb_node **link = &cm.listen_service_table.rb_node;
394 struct rb_node *parent = NULL;
395 struct cm_id_private *cur_cm_id_priv;
97f52eb4
SH		 396 __be64 service_id = cm_id_priv->id.service_id;
397 __be64 service_mask = cm_id_priv->id.service_mask;
6e61d04f 398 int data_cmp;
a977049d
HR		 399
400 while (*link) {
401 parent = *link;
402 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
403 service_node);
6e61d04f
SH		 404 data_cmp = cm_compare_data(cm_id_priv->compare_data,
405 cur_cm_id_priv->compare_data);
a977049d 406 if ((cur_cm_id_priv->id.service_mask & service_id) ==
07d357d0 407 (service_mask & cur_cm_id_priv->id.service_id) &&
6e61d04f
SH		 408 (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
409 !data_cmp)
07d357d0
SH		 410 return cur_cm_id_priv;
411
412 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
413 link = &(*link)->rb_left;
414 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
415 link = &(*link)->rb_right;
416 else if (service_id < cur_cm_id_priv->id.service_id)
a977049d 417 link = &(*link)->rb_left;
6e61d04f
SH		 418 else if (service_id > cur_cm_id_priv->id.service_id)
419 link = &(*link)->rb_right;
420 else if (data_cmp < 0)
421 link = &(*link)->rb_left;
a977049d
HR		 422 else
423 link = &(*link)->rb_right;
424 }
425 rb_link_node(&cm_id_priv->service_node, parent, link);
426 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
427 return NULL;
428}
429
07d357d0 430static struct cm_id_private * cm_find_listen(struct ib_device *device,
6e61d04f
SH		 431 __be64 service_id,
432 u8 *private_data)
a977049d
HR		 433{
434 struct rb_node *node = cm.listen_service_table.rb_node;
435 struct cm_id_private *cm_id_priv;
6e61d04f 436 int data_cmp;
a977049d
HR		 437
438 while (node) {
439 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
6e61d04f
SH		 440 data_cmp = cm_compare_private_data(private_data,
441 cm_id_priv->compare_data);
a977049d 442 if ((cm_id_priv->id.service_mask & service_id) ==
07d357d0 443 cm_id_priv->id.service_id &&
6e61d04f 444 (cm_id_priv->id.device == device) && !data_cmp)
a977049d 445 return cm_id_priv;
07d357d0
SH		 446
447 if (device < cm_id_priv->id.device)
448 node = node->rb_left;
449 else if (device > cm_id_priv->id.device)
450 node = node->rb_right;
451 else if (service_id < cm_id_priv->id.service_id)
a977049d 452 node = node->rb_left;
6e61d04f
SH		 453 else if (service_id > cm_id_priv->id.service_id)
454 node = node->rb_right;
455 else if (data_cmp < 0)
456 node = node->rb_left;
a977049d
HR		 457 else
458 node = node->rb_right;
459 }
460 return NULL;
461}
462
463static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
464 *timewait_info)
465{
466 struct rb_node **link = &cm.remote_id_table.rb_node;
467 struct rb_node *parent = NULL;
468 struct cm_timewait_info *cur_timewait_info;
97f52eb4
SH		 469 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
470 __be32 remote_id = timewait_info->work.remote_id;
a977049d
HR		 471
472 while (*link) {
473 parent = *link;
474 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
475 remote_id_node);
476 if (remote_id < cur_timewait_info->work.remote_id)
477 link = &(*link)->rb_left;
478 else if (remote_id > cur_timewait_info->work.remote_id)
479 link = &(*link)->rb_right;
480 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
481 link = &(*link)->rb_left;
482 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
483 link = &(*link)->rb_right;
484 else
485 return cur_timewait_info;
486 }
487 timewait_info->inserted_remote_id = 1;
488 rb_link_node(&timewait_info->remote_id_node, parent, link);
489 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
490 return NULL;
491}
492
97f52eb4
SH		 493static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
494 __be32 remote_id)
a977049d
HR		 495{
496 struct rb_node *node = cm.remote_id_table.rb_node;
497 struct cm_timewait_info *timewait_info;
498
499 while (node) {
500 timewait_info = rb_entry(node, struct cm_timewait_info,
501 remote_id_node);
502 if (remote_id < timewait_info->work.remote_id)
503 node = node->rb_left;
504 else if (remote_id > timewait_info->work.remote_id)
505 node = node->rb_right;
506 else if (remote_ca_guid < timewait_info->remote_ca_guid)
507 node = node->rb_left;
508 else if (remote_ca_guid > timewait_info->remote_ca_guid)
509 node = node->rb_right;
510 else
511 return timewait_info;
512 }
513 return NULL;
514}
515
516static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
517 *timewait_info)
518{
519 struct rb_node **link = &cm.remote_qp_table.rb_node;
520 struct rb_node *parent = NULL;
521 struct cm_timewait_info *cur_timewait_info;
97f52eb4
SH		 522 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
523 __be32 remote_qpn = timewait_info->remote_qpn;
a977049d
HR		 524
525 while (*link) {
526 parent = *link;
527 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
528 remote_qp_node);
529 if (remote_qpn < cur_timewait_info->remote_qpn)
530 link = &(*link)->rb_left;
531 else if (remote_qpn > cur_timewait_info->remote_qpn)
532 link = &(*link)->rb_right;
533 else if (remote_ca_guid < cur_timewait_info->remote_ca_guid)
534 link = &(*link)->rb_left;
535 else if (remote_ca_guid > cur_timewait_info->remote_ca_guid)
536 link = &(*link)->rb_right;
537 else
538 return cur_timewait_info;
539 }
540 timewait_info->inserted_remote_qp = 1;
541 rb_link_node(&timewait_info->remote_qp_node, parent, link);
542 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
543 return NULL;
544}
545
546static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
547 *cm_id_priv)
548{
549 struct rb_node **link = &cm.remote_sidr_table.rb_node;
550 struct rb_node *parent = NULL;
551 struct cm_id_private *cur_cm_id_priv;
552 union ib_gid *port_gid = &cm_id_priv->av.dgid;
97f52eb4 553 __be32 remote_id = cm_id_priv->id.remote_id;
a977049d
HR		 554
555 while (*link) {
556 parent = *link;
557 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
558 sidr_id_node);
559 if (remote_id < cur_cm_id_priv->id.remote_id)
560 link = &(*link)->rb_left;
561 else if (remote_id > cur_cm_id_priv->id.remote_id)
562 link = &(*link)->rb_right;
563 else {
564 int cmp;
565 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
566 sizeof *port_gid);
567 if (cmp < 0)
568 link = &(*link)->rb_left;
569 else if (cmp > 0)
570 link = &(*link)->rb_right;
571 else
572 return cur_cm_id_priv;
573 }
574 }
575 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
576 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
577 return NULL;
578}
579
580static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
581 enum ib_cm_sidr_status status)
582{
583 struct ib_cm_sidr_rep_param param;
584
585 memset(&param, 0, sizeof param);
586 param.status = status;
587 ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
588}
589
07d357d0
SH		 590struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
591 ib_cm_handler cm_handler,
a977049d
HR		 592 void *context)
593{
594 struct cm_id_private *cm_id_priv;
595 int ret;
596
de6eb66b 597 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
a977049d
HR		 598 if (!cm_id_priv)
599 return ERR_PTR(-ENOMEM);
600
a977049d 601 cm_id_priv->id.state = IB_CM_IDLE;
07d357d0 602 cm_id_priv->id.device = device;
a977049d
HR		 603 cm_id_priv->id.cm_handler = cm_handler;
604 cm_id_priv->id.context = context;
354ba39c 605 cm_id_priv->id.remote_cm_qpn = 1;
a977049d
HR		 606 ret = cm_alloc_id(cm_id_priv);
607 if (ret)
608 goto error;
609
610 spin_lock_init(&cm_id_priv->lock);
1b52fa98 611 init_completion(&cm_id_priv->comp);
a977049d
HR		 612 INIT_LIST_HEAD(&cm_id_priv->work_list);
613 atomic_set(&cm_id_priv->work_count, -1);
614 atomic_set(&cm_id_priv->refcount, 1);
615 return &cm_id_priv->id;
616
617error:
618 kfree(cm_id_priv);
619 return ERR_PTR(-ENOMEM);
620}
621EXPORT_SYMBOL(ib_create_cm_id);
622
623static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
624{
625 struct cm_work *work;
626
627 if (list_empty(&cm_id_priv->work_list))
628 return NULL;
629
630 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
631 list_del(&work->list);
632 return work;
633}
634
635static void cm_free_work(struct cm_work *work)
636{
637 if (work->mad_recv_wc)
638 ib_free_recv_mad(work->mad_recv_wc);
639 kfree(work);
640}
641
642static inline int cm_convert_to_ms(int iba_time)
643{
644 /* approximate conversion to ms from 4.096us x 2^iba_time */
645 return 1 << max(iba_time - 8, 0);
646}
647
1d846126
SH		 648/*
649 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
650 * Because of how ack_timeout is stored, adding one doubles the timeout.
651 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
652 * increment it (round up) only if the other is within 50%.
653 */
654static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
655{
656 int ack_timeout = packet_life_time + 1;
657
658 if (ack_timeout >= ca_ack_delay)
659 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
660 else
661 ack_timeout = ca_ack_delay +
662 (ack_timeout >= (ca_ack_delay - 1));
663
664 return min(31, ack_timeout);
665}
666
a977049d
HR		 667static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
668{
a977049d
HR		 669 if (timewait_info->inserted_remote_id) {
670 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
671 timewait_info->inserted_remote_id = 0;
672 }
673
674 if (timewait_info->inserted_remote_qp) {
675 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
676 timewait_info->inserted_remote_qp = 0;
677 }
a977049d
HR		 678}
679
97f52eb4 680static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
a977049d
HR		 681{
682 struct cm_timewait_info *timewait_info;
683
de6eb66b 684 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
a977049d
HR		 685 if (!timewait_info)
686 return ERR_PTR(-ENOMEM);
a977049d
HR		 687
688 timewait_info->work.local_id = local_id;
c4028958 689 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
a977049d
HR		 690 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
691 return timewait_info;
692}
693
694static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
695{
696 int wait_time;
8575329d 697 unsigned long flags;
a977049d 698
8575329d 699 spin_lock_irqsave(&cm.lock, flags);
a70d0590 700 cm_cleanup_timewait(cm_id_priv->timewait_info);
8575329d
SH		 701 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
702 spin_unlock_irqrestore(&cm.lock, flags);
a70d0590 703
a977049d
HR		 704 /*
705 * The cm_id could be destroyed by the user before we exit timewait.
706 * To protect against this, we search for the cm_id after exiting
707 * timewait before notifying the user that we've exited timewait.
708 */
709 cm_id_priv->id.state = IB_CM_TIMEWAIT;
1d846126 710 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
a977049d
HR		 711 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
712 msecs_to_jiffies(wait_time));
713 cm_id_priv->timewait_info = NULL;
714}
715
716static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
717{
8575329d
SH		 718 unsigned long flags;
719
a977049d
HR		 720 cm_id_priv->id.state = IB_CM_IDLE;
721 if (cm_id_priv->timewait_info) {
8575329d 722 spin_lock_irqsave(&cm.lock, flags);
a977049d 723 cm_cleanup_timewait(cm_id_priv->timewait_info);
8575329d 724 spin_unlock_irqrestore(&cm.lock, flags);
a977049d
HR		 725 kfree(cm_id_priv->timewait_info);
726 cm_id_priv->timewait_info = NULL;
727 }
728}
729
04c33543 730static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
a977049d
HR		 731{
732 struct cm_id_private *cm_id_priv;
733 struct cm_work *work;
a977049d
HR		 734
735 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
736retest:
24be6e81 737 spin_lock_irq(&cm_id_priv->lock);
a977049d
HR		 738 switch (cm_id->state) {
739 case IB_CM_LISTEN:
740 cm_id->state = IB_CM_IDLE;
24be6e81
SH		 741 spin_unlock_irq(&cm_id_priv->lock);
742 spin_lock_irq(&cm.lock);
a977049d 743 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
24be6e81 744 spin_unlock_irq(&cm.lock);
a977049d
HR		 745 break;
746 case IB_CM_SIDR_REQ_SENT:
747 cm_id->state = IB_CM_IDLE;
34816ad9 748 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
24be6e81 749 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 750 break;
751 case IB_CM_SIDR_REQ_RCVD:
24be6e81 752 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 753 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
754 break;
755 case IB_CM_REQ_SENT:
227eca83 756 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
24be6e81 757 spin_unlock_irq(&cm_id_priv->lock);
227eca83 758 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
e971b8cd
SH		 759 &cm_id_priv->id.device->node_guid,
760 sizeof cm_id_priv->id.device->node_guid,
227eca83
SH		 761 NULL, 0);
762 break;
04c33543
MT		 763 case IB_CM_REQ_RCVD:
764 if (err == -ENOMEM) {
765 /* Do not reject to allow future retries. */
766 cm_reset_to_idle(cm_id_priv);
24be6e81 767 spin_unlock_irq(&cm_id_priv->lock);
04c33543 768 } else {
24be6e81 769 spin_unlock_irq(&cm_id_priv->lock);
04c33543
MT		 770 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
771 NULL, 0, NULL, 0);
772 }
773 break;
a977049d
HR		 774 case IB_CM_MRA_REQ_RCVD:
775 case IB_CM_REP_SENT:
776 case IB_CM_MRA_REP_RCVD:
34816ad9 777 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d 778 /* Fall through */
a977049d
HR		 779 case IB_CM_MRA_REQ_SENT:
780 case IB_CM_REP_RCVD:
781 case IB_CM_MRA_REP_SENT:
24be6e81 782 spin_unlock_irq(&cm_id_priv->lock);
227eca83
SH		 783 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
784 NULL, 0, NULL, 0);
a977049d
HR		 785 break;
786 case IB_CM_ESTABLISHED:
24be6e81 787 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 788 ib_send_cm_dreq(cm_id, NULL, 0);
789 goto retest;
790 case IB_CM_DREQ_SENT:
34816ad9 791 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d 792 cm_enter_timewait(cm_id_priv);
24be6e81 793 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 794 break;
795 case IB_CM_DREQ_RCVD:
24be6e81 796 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 797 ib_send_cm_drep(cm_id, NULL, 0);
798 break;
799 default:
24be6e81 800 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 801 break;
802 }
803
804 cm_free_id(cm_id->local_id);
1b52fa98
SH		 805 cm_deref_id(cm_id_priv);
806 wait_for_completion(&cm_id_priv->comp);
a977049d
HR		 807 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
808 cm_free_work(work);
6e61d04f
SH		 809 kfree(cm_id_priv->compare_data);
810 kfree(cm_id_priv->private_data);
a977049d
HR		 811 kfree(cm_id_priv);
812}
04c33543
MT		 813
814void ib_destroy_cm_id(struct ib_cm_id *cm_id)
815{
816 cm_destroy_id(cm_id, 0);
817}
a977049d
HR		 818EXPORT_SYMBOL(ib_destroy_cm_id);
819
6e61d04f
SH		 820int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
821 struct ib_cm_compare_data *compare_data)
a977049d
HR		 822{
823 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
824 unsigned long flags;
825 int ret = 0;
826
97f52eb4
SH		 827 service_mask = service_mask ? service_mask :
828 __constant_cpu_to_be64(~0ULL);
a977049d
HR		 829 service_id &= service_mask;
830 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
831 (service_id != IB_CM_ASSIGN_SERVICE_ID))
832 return -EINVAL;
833
834 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
6e61d04f
SH		 835 if (cm_id->state != IB_CM_IDLE)
836 return -EINVAL;
837
838 if (compare_data) {
839 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
840 GFP_KERNEL);
841 if (!cm_id_priv->compare_data)
842 return -ENOMEM;
843 cm_mask_copy(cm_id_priv->compare_data->data,
844 compare_data->data, compare_data->mask);
845 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
846 IB_CM_COMPARE_SIZE);
847 }
a977049d
HR		 848
849 cm_id->state = IB_CM_LISTEN;
850
851 spin_lock_irqsave(&cm.lock, flags);
852 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
97f52eb4
SH		 853 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
854 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
a977049d
HR		 855 } else {
856 cm_id->service_id = service_id;
857 cm_id->service_mask = service_mask;
858 }
859 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
860 spin_unlock_irqrestore(&cm.lock, flags);
861
862 if (cur_cm_id_priv) {
863 cm_id->state = IB_CM_IDLE;
6e61d04f
SH		 864 kfree(cm_id_priv->compare_data);
865 cm_id_priv->compare_data = NULL;
a977049d
HR		 866 ret = -EBUSY;
867 }
868 return ret;
869}
870EXPORT_SYMBOL(ib_cm_listen);
871
97f52eb4
SH		 872static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
873 enum cm_msg_sequence msg_seq)
a977049d
HR		 874{
875 u64 hi_tid, low_tid;
876
877 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
97f52eb4
SH		 878 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
879 (msg_seq << 30));
a977049d
HR		 880 return cpu_to_be64(hi_tid | low_tid);
881}
882
883static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
97f52eb4 884 __be16 attr_id, __be64 tid)
a977049d
HR		 885{
886 hdr->base_version = IB_MGMT_BASE_VERSION;
887 hdr->mgmt_class = IB_MGMT_CLASS_CM;
888 hdr->class_version = IB_CM_CLASS_VERSION;
889 hdr->method = IB_MGMT_METHOD_SEND;
890 hdr->attr_id = attr_id;
891 hdr->tid = tid;
892}
893
894static void cm_format_req(struct cm_req_msg *req_msg,
895 struct cm_id_private *cm_id_priv,
896 struct ib_cm_req_param *param)
897{
898 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
899 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
900
901 req_msg->local_comm_id = cm_id_priv->id.local_id;
902 req_msg->service_id = param->service_id;
e971b8cd 903 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
a977049d
HR		 904 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
905 cm_req_set_resp_res(req_msg, param->responder_resources);
906 cm_req_set_init_depth(req_msg, param->initiator_depth);
907 cm_req_set_remote_resp_timeout(req_msg,
908 param->remote_cm_response_timeout);
909 cm_req_set_qp_type(req_msg, param->qp_type);
910 cm_req_set_flow_ctrl(req_msg, param->flow_control);
911 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
912 cm_req_set_local_resp_timeout(req_msg,
913 param->local_cm_response_timeout);
914 cm_req_set_retry_count(req_msg, param->retry_count);
915 req_msg->pkey = param->primary_path->pkey;
916 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
917 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
918 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
919 cm_req_set_srq(req_msg, param->srq);
920
921 req_msg->primary_local_lid = param->primary_path->slid;
922 req_msg->primary_remote_lid = param->primary_path->dlid;
923 req_msg->primary_local_gid = param->primary_path->sgid;
924 req_msg->primary_remote_gid = param->primary_path->dgid;
925 cm_req_set_primary_flow_label(req_msg, param->primary_path->flow_label);
926 cm_req_set_primary_packet_rate(req_msg, param->primary_path->rate);
927 req_msg->primary_traffic_class = param->primary_path->traffic_class;
928 req_msg->primary_hop_limit = param->primary_path->hop_limit;
929 cm_req_set_primary_sl(req_msg, param->primary_path->sl);
930 cm_req_set_primary_subnet_local(req_msg, 1); /* local only... */
931 cm_req_set_primary_local_ack_timeout(req_msg,
1d846126
SH		 932 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
933 param->primary_path->packet_life_time));
a977049d
HR		 934
935 if (param->alternate_path) {
936 req_msg->alt_local_lid = param->alternate_path->slid;
937 req_msg->alt_remote_lid = param->alternate_path->dlid;
938 req_msg->alt_local_gid = param->alternate_path->sgid;
939 req_msg->alt_remote_gid = param->alternate_path->dgid;
940 cm_req_set_alt_flow_label(req_msg,
941 param->alternate_path->flow_label);
942 cm_req_set_alt_packet_rate(req_msg, param->alternate_path->rate);
943 req_msg->alt_traffic_class = param->alternate_path->traffic_class;
944 req_msg->alt_hop_limit = param->alternate_path->hop_limit;
945 cm_req_set_alt_sl(req_msg, param->alternate_path->sl);
946 cm_req_set_alt_subnet_local(req_msg, 1); /* local only... */
947 cm_req_set_alt_local_ack_timeout(req_msg,
1d846126
SH		 948 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
949 param->alternate_path->packet_life_time));
a977049d
HR		 950 }
951
952 if (param->private_data && param->private_data_len)
953 memcpy(req_msg->private_data, param->private_data,
954 param->private_data_len);
955}
956
858119e1 957static int cm_validate_req_param(struct ib_cm_req_param *param)
a977049d
HR		 958{
959 /* peer-to-peer not supported */
960 if (param->peer_to_peer)
961 return -EINVAL;
962
963 if (!param->primary_path)
964 return -EINVAL;
965
966 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC)
967 return -EINVAL;
968
969 if (param->private_data &&
970 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
971 return -EINVAL;
972
973 if (param->alternate_path &&
974 (param->alternate_path->pkey != param->primary_path->pkey ||
975 param->alternate_path->mtu != param->primary_path->mtu))
976 return -EINVAL;
977
978 return 0;
979}
980
981int ib_send_cm_req(struct ib_cm_id *cm_id,
982 struct ib_cm_req_param *param)
983{
984 struct cm_id_private *cm_id_priv;
a977049d
HR		 985 struct cm_req_msg *req_msg;
986 unsigned long flags;
987 int ret;
988
989 ret = cm_validate_req_param(param);
990 if (ret)
991 return ret;
992
993 /* Verify that we're not in timewait. */
994 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
995 spin_lock_irqsave(&cm_id_priv->lock, flags);
996 if (cm_id->state != IB_CM_IDLE) {
997 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
998 ret = -EINVAL;
999 goto out;
1000 }
1001 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1002
1003 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1004 id.local_id);
75df23e2
SH		 1005 if (IS_ERR(cm_id_priv->timewait_info)) {
1006 ret = PTR_ERR(cm_id_priv->timewait_info);
a977049d 1007 goto out;
75df23e2 1008 }
a977049d
HR		 1009
1010 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
1011 if (ret)
1012 goto error1;
1013 if (param->alternate_path) {
1014 ret = cm_init_av_by_path(param->alternate_path,
1015 &cm_id_priv->alt_av);
1016 if (ret)
1017 goto error1;
1018 }
1019 cm_id->service_id = param->service_id;
97f52eb4 1020 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
a977049d
HR		 1021 cm_id_priv->timeout_ms = cm_convert_to_ms(
1022 param->primary_path->packet_life_time) * 2 +
1023 cm_convert_to_ms(
1024 param->remote_cm_response_timeout);
1025 cm_id_priv->max_cm_retries = param->max_cm_retries;
1026 cm_id_priv->initiator_depth = param->initiator_depth;
1027 cm_id_priv->responder_resources = param->responder_resources;
1028 cm_id_priv->retry_count = param->retry_count;
1029 cm_id_priv->path_mtu = param->primary_path->mtu;
e1444b5a 1030 cm_id_priv->pkey = param->primary_path->pkey;
ae7971a7 1031 cm_id_priv->qp_type = param->qp_type;
a977049d
HR		 1032
1033 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1034 if (ret)
1035 goto error1;
1036
1037 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1038 cm_format_req(req_msg, cm_id_priv, param);
1039 cm_id_priv->tid = req_msg->hdr.tid;
34816ad9 1040 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
a977049d
HR		 1041 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1042
1043 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1044 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
a977049d
HR		 1045
1046 spin_lock_irqsave(&cm_id_priv->lock, flags);
34816ad9 1047 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
a977049d
HR		 1048 if (ret) {
1049 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1050 goto error2;
1051 }
1052 BUG_ON(cm_id->state != IB_CM_IDLE);
1053 cm_id->state = IB_CM_REQ_SENT;
1054 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1055 return 0;
1056
1057error2: cm_free_msg(cm_id_priv->msg);
1058error1: kfree(cm_id_priv->timewait_info);
1059out: return ret;
1060}
1061EXPORT_SYMBOL(ib_send_cm_req);
1062
1063static int cm_issue_rej(struct cm_port *port,
1064 struct ib_mad_recv_wc *mad_recv_wc,
1065 enum ib_cm_rej_reason reason,
1066 enum cm_msg_response msg_rejected,
1067 void *ari, u8 ari_length)
1068{
1069 struct ib_mad_send_buf *msg = NULL;
a977049d
HR		 1070 struct cm_rej_msg *rej_msg, *rcv_msg;
1071 int ret;
1072
1073 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1074 if (ret)
1075 return ret;
1076
1077 /* We just need common CM header information. Cast to any message. */
1078 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1079 rej_msg = (struct cm_rej_msg *) msg->mad;
1080
1081 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1082 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1083 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1084 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
97f52eb4 1085 rej_msg->reason = cpu_to_be16(reason);
a977049d
HR		 1086
1087 if (ari && ari_length) {
1088 cm_rej_set_reject_info_len(rej_msg, ari_length);
1089 memcpy(rej_msg->ari, ari, ari_length);
1090 }
1091
34816ad9 1092 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 1093 if (ret)
1094 cm_free_msg(msg);
1095
1096 return ret;
1097}
1098
97f52eb4
SH		 1099static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1100 __be32 local_qpn, __be32 remote_qpn)
a977049d
HR		 1101{
1102 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1103 ((local_ca_guid == remote_ca_guid) &&
1104 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1105}
1106
858119e1 1107static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
a977049d
HR		 1108 struct ib_sa_path_rec *primary_path,
1109 struct ib_sa_path_rec *alt_path)
1110{
1111 memset(primary_path, 0, sizeof *primary_path);
1112 primary_path->dgid = req_msg->primary_local_gid;
1113 primary_path->sgid = req_msg->primary_remote_gid;
1114 primary_path->dlid = req_msg->primary_local_lid;
1115 primary_path->slid = req_msg->primary_remote_lid;
1116 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1117 primary_path->hop_limit = req_msg->primary_hop_limit;
1118 primary_path->traffic_class = req_msg->primary_traffic_class;
1119 primary_path->reversible = 1;
1120 primary_path->pkey = req_msg->pkey;
1121 primary_path->sl = cm_req_get_primary_sl(req_msg);
1122 primary_path->mtu_selector = IB_SA_EQ;
1123 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1124 primary_path->rate_selector = IB_SA_EQ;
1125 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1126 primary_path->packet_life_time_selector = IB_SA_EQ;
1127 primary_path->packet_life_time =
1128 cm_req_get_primary_local_ack_timeout(req_msg);
1129 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1130
1131 if (req_msg->alt_local_lid) {
1132 memset(alt_path, 0, sizeof *alt_path);
1133 alt_path->dgid = req_msg->alt_local_gid;
1134 alt_path->sgid = req_msg->alt_remote_gid;
1135 alt_path->dlid = req_msg->alt_local_lid;
1136 alt_path->slid = req_msg->alt_remote_lid;
1137 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1138 alt_path->hop_limit = req_msg->alt_hop_limit;
1139 alt_path->traffic_class = req_msg->alt_traffic_class;
1140 alt_path->reversible = 1;
1141 alt_path->pkey = req_msg->pkey;
1142 alt_path->sl = cm_req_get_alt_sl(req_msg);
1143 alt_path->mtu_selector = IB_SA_EQ;
1144 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1145 alt_path->rate_selector = IB_SA_EQ;
1146 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1147 alt_path->packet_life_time_selector = IB_SA_EQ;
1148 alt_path->packet_life_time =
1149 cm_req_get_alt_local_ack_timeout(req_msg);
1150 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1151 }
1152}
1153
1154static void cm_format_req_event(struct cm_work *work,
1155 struct cm_id_private *cm_id_priv,
1156 struct ib_cm_id *listen_id)
1157{
1158 struct cm_req_msg *req_msg;
1159 struct ib_cm_req_event_param *param;
1160
1161 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1162 param = &work->cm_event.param.req_rcvd;
1163 param->listen_id = listen_id;
a977049d
HR		 1164 param->port = cm_id_priv->av.port->port_num;
1165 param->primary_path = &work->path[0];
1166 if (req_msg->alt_local_lid)
1167 param->alternate_path = &work->path[1];
1168 else
1169 param->alternate_path = NULL;
1170 param->remote_ca_guid = req_msg->local_ca_guid;
1171 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1172 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1173 param->qp_type = cm_req_get_qp_type(req_msg);
1174 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1175 param->responder_resources = cm_req_get_init_depth(req_msg);
1176 param->initiator_depth = cm_req_get_resp_res(req_msg);
1177 param->local_cm_response_timeout =
1178 cm_req_get_remote_resp_timeout(req_msg);
1179 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1180 param->remote_cm_response_timeout =
1181 cm_req_get_local_resp_timeout(req_msg);
1182 param->retry_count = cm_req_get_retry_count(req_msg);
1183 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1184 param->srq = cm_req_get_srq(req_msg);
1185 work->cm_event.private_data = &req_msg->private_data;
1186}
1187
1188static void cm_process_work(struct cm_id_private *cm_id_priv,
1189 struct cm_work *work)
1190{
a977049d
HR		 1191 int ret;
1192
1193 /* We will typically only have the current event to report. */
1194 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1195 cm_free_work(work);
1196
1197 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
24be6e81 1198 spin_lock_irq(&cm_id_priv->lock);
a977049d 1199 work = cm_dequeue_work(cm_id_priv);
24be6e81 1200 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 1201 BUG_ON(!work);
1202 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1203 &work->cm_event);
1204 cm_free_work(work);
1205 }
1206 cm_deref_id(cm_id_priv);
1207 if (ret)
04c33543 1208 cm_destroy_id(&cm_id_priv->id, ret);
a977049d
HR		 1209}
1210
1211static void cm_format_mra(struct cm_mra_msg *mra_msg,
1212 struct cm_id_private *cm_id_priv,
1213 enum cm_msg_response msg_mraed, u8 service_timeout,
1214 const void *private_data, u8 private_data_len)
1215{
1216 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1217 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1218 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1219 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1220 cm_mra_set_service_timeout(mra_msg, service_timeout);
1221
1222 if (private_data && private_data_len)
1223 memcpy(mra_msg->private_data, private_data, private_data_len);
1224}
1225
1226static void cm_format_rej(struct cm_rej_msg *rej_msg,
1227 struct cm_id_private *cm_id_priv,
1228 enum ib_cm_rej_reason reason,
1229 void *ari,
1230 u8 ari_length,
1231 const void *private_data,
1232 u8 private_data_len)
1233{
1234 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1235 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1236
1237 switch(cm_id_priv->id.state) {
1238 case IB_CM_REQ_RCVD:
1239 rej_msg->local_comm_id = 0;
1240 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1241 break;
1242 case IB_CM_MRA_REQ_SENT:
1243 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1244 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1245 break;
1246 case IB_CM_REP_RCVD:
1247 case IB_CM_MRA_REP_SENT:
1248 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1249 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1250 break;
1251 default:
1252 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1253 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1254 break;
1255 }
1256
97f52eb4 1257 rej_msg->reason = cpu_to_be16(reason);
a977049d
HR		 1258 if (ari && ari_length) {
1259 cm_rej_set_reject_info_len(rej_msg, ari_length);
1260 memcpy(rej_msg->ari, ari, ari_length);
1261 }
1262
1263 if (private_data && private_data_len)
1264 memcpy(rej_msg->private_data, private_data, private_data_len);
1265}
1266
1267static void cm_dup_req_handler(struct cm_work *work,
1268 struct cm_id_private *cm_id_priv)
1269{
1270 struct ib_mad_send_buf *msg = NULL;
a977049d
HR		 1271 int ret;
1272
1273 /* Quick state check to discard duplicate REQs. */
1274 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1275 return;
1276
1277 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1278 if (ret)
1279 return;
1280
24be6e81 1281 spin_lock_irq(&cm_id_priv->lock);
a977049d
HR		 1282 switch (cm_id_priv->id.state) {
1283 case IB_CM_MRA_REQ_SENT:
1284 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1285 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1286 cm_id_priv->private_data,
1287 cm_id_priv->private_data_len);
1288 break;
1289 case IB_CM_TIMEWAIT:
1290 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1291 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1292 break;
1293 default:
1294 goto unlock;
1295 }
24be6e81 1296 spin_unlock_irq(&cm_id_priv->lock);
a977049d 1297
34816ad9 1298 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 1299 if (ret)
1300 goto free;
1301 return;
1302
24be6e81 1303unlock: spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 1304free: cm_free_msg(msg);
1305}
1306
1307static struct cm_id_private * cm_match_req(struct cm_work *work,
1308 struct cm_id_private *cm_id_priv)
1309{
1310 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1311 struct cm_timewait_info *timewait_info;
1312 struct cm_req_msg *req_msg;
a977049d
HR		 1313
1314 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1315
d998ccce 1316 /* Check for possible duplicate REQ. */
24be6e81 1317 spin_lock_irq(&cm.lock);
a977049d 1318 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
a977049d
HR		 1319 if (timewait_info) {
1320 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1321 timewait_info->work.remote_id);
24be6e81 1322 spin_unlock_irq(&cm.lock);
a977049d
HR		 1323 if (cur_cm_id_priv) {
1324 cm_dup_req_handler(work, cur_cm_id_priv);
1325 cm_deref_id(cur_cm_id_priv);
d998ccce
SH		 1326 }
1327 return NULL;
1328 }
1329
1330 /* Check for stale connections. */
1331 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1332 if (timewait_info) {
1333 cm_cleanup_timewait(cm_id_priv->timewait_info);
24be6e81 1334 spin_unlock_irq(&cm.lock);
d998ccce
SH		 1335 cm_issue_rej(work->port, work->mad_recv_wc,
1336 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1337 NULL, 0);
1338 return NULL;
a977049d
HR		 1339 }
1340
1341 /* Find matching listen request. */
07d357d0 1342 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
6e61d04f
SH		 1343 req_msg->service_id,
1344 req_msg->private_data);
a977049d 1345 if (!listen_cm_id_priv) {
8575329d 1346 cm_cleanup_timewait(cm_id_priv->timewait_info);
24be6e81 1347 spin_unlock_irq(&cm.lock);
a977049d
HR		 1348 cm_issue_rej(work->port, work->mad_recv_wc,
1349 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1350 NULL, 0);
8575329d 1351 goto out;
a977049d
HR		 1352 }
1353 atomic_inc(&listen_cm_id_priv->refcount);
1354 atomic_inc(&cm_id_priv->refcount);
1355 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1356 atomic_inc(&cm_id_priv->work_count);
24be6e81 1357 spin_unlock_irq(&cm.lock);
8575329d 1358out:
a977049d 1359 return listen_cm_id_priv;
a977049d
HR		 1360}
1361
1362static int cm_req_handler(struct cm_work *work)
1363{
1364 struct ib_cm_id *cm_id;
1365 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1366 struct cm_req_msg *req_msg;
1367 int ret;
1368
1369 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1370
07d357d0 1371 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
a977049d
HR		 1372 if (IS_ERR(cm_id))
1373 return PTR_ERR(cm_id);
1374
1375 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1376 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1377 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
ca222c6b 1378 work->mad_recv_wc->recv_buf.grh,
a977049d
HR		 1379 &cm_id_priv->av);
1380 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1381 id.local_id);
1382 if (IS_ERR(cm_id_priv->timewait_info)) {
1383 ret = PTR_ERR(cm_id_priv->timewait_info);
76842405 1384 goto destroy;
a977049d
HR		 1385 }
1386 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1387 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1388 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1389
1390 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1391 if (!listen_cm_id_priv) {
1392 ret = -EINVAL;
76842405
SH		 1393 kfree(cm_id_priv->timewait_info);
1394 goto destroy;
a977049d
HR		 1395 }
1396
1397 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1398 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1399 cm_id_priv->id.service_id = req_msg->service_id;
97f52eb4 1400 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
a977049d
HR		 1401
1402 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1403 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
76842405
SH		 1404 if (ret) {
1405 ib_get_cached_gid(work->port->cm_dev->device,
1406 work->port->port_num, 0, &work->path[0].sgid);
1407 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1408 &work->path[0].sgid, sizeof work->path[0].sgid,
1409 NULL, 0);
1410 goto rejected;
1411 }
a977049d
HR		 1412 if (req_msg->alt_local_lid) {
1413 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
76842405
SH		 1414 if (ret) {
1415 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1416 &work->path[0].sgid,
1417 sizeof work->path[0].sgid, NULL, 0);
1418 goto rejected;
1419 }
a977049d
HR		 1420 }
1421 cm_id_priv->tid = req_msg->hdr.tid;
1422 cm_id_priv->timeout_ms = cm_convert_to_ms(
1423 cm_req_get_local_resp_timeout(req_msg));
1424 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1425 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1426 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1427 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1428 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
e1444b5a 1429 cm_id_priv->pkey = req_msg->pkey;
a977049d 1430 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
a977049d
HR		 1431 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1432 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
ae7971a7 1433 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
a977049d
HR		 1434
1435 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1436 cm_process_work(cm_id_priv, work);
1437 cm_deref_id(listen_cm_id_priv);
1438 return 0;
1439
76842405
SH		 1440rejected:
1441 atomic_dec(&cm_id_priv->refcount);
a977049d 1442 cm_deref_id(listen_cm_id_priv);
76842405
SH		 1443destroy:
1444 ib_destroy_cm_id(cm_id);
a977049d
HR		 1445 return ret;
1446}
1447
1448static void cm_format_rep(struct cm_rep_msg *rep_msg,
1449 struct cm_id_private *cm_id_priv,
1450 struct ib_cm_rep_param *param)
1451{
1452 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1453 rep_msg->local_comm_id = cm_id_priv->id.local_id;
1454 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1455 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1456 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1457 rep_msg->resp_resources = param->responder_resources;
1458 rep_msg->initiator_depth = param->initiator_depth;
1d846126
SH		 1459 cm_rep_set_target_ack_delay(rep_msg,
1460 cm_id_priv->av.port->cm_dev->ack_delay);
a977049d
HR		 1461 cm_rep_set_failover(rep_msg, param->failover_accepted);
1462 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1463 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1464 cm_rep_set_srq(rep_msg, param->srq);
e971b8cd 1465 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
a977049d
HR		 1466
1467 if (param->private_data && param->private_data_len)
1468 memcpy(rep_msg->private_data, param->private_data,
1469 param->private_data_len);
1470}
1471
1472int ib_send_cm_rep(struct ib_cm_id *cm_id,
1473 struct ib_cm_rep_param *param)
1474{
1475 struct cm_id_private *cm_id_priv;
1476 struct ib_mad_send_buf *msg;
1477 struct cm_rep_msg *rep_msg;
a977049d
HR		 1478 unsigned long flags;
1479 int ret;
1480
1481 if (param->private_data &&
1482 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1483 return -EINVAL;
1484
1485 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1486 spin_lock_irqsave(&cm_id_priv->lock, flags);
1487 if (cm_id->state != IB_CM_REQ_RCVD &&
1488 cm_id->state != IB_CM_MRA_REQ_SENT) {
1489 ret = -EINVAL;
1490 goto out;
1491 }
1492
1493 ret = cm_alloc_msg(cm_id_priv, &msg);
1494 if (ret)
1495 goto out;
1496
1497 rep_msg = (struct cm_rep_msg *) msg->mad;
1498 cm_format_rep(rep_msg, cm_id_priv, param);
34816ad9 1499 msg->timeout_ms = cm_id_priv->timeout_ms;
a977049d
HR		 1500 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1501
34816ad9 1502 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 1503 if (ret) {
1504 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1505 cm_free_msg(msg);
1506 return ret;
1507 }
1508
1509 cm_id->state = IB_CM_REP_SENT;
1510 cm_id_priv->msg = msg;
1511 cm_id_priv->initiator_depth = param->initiator_depth;
1512 cm_id_priv->responder_resources = param->responder_resources;
1513 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1514 cm_id_priv->local_qpn = cm_rep_get_local_qpn(rep_msg);
1515
1516out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1517 return ret;
1518}
1519EXPORT_SYMBOL(ib_send_cm_rep);
1520
1521static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1522 struct cm_id_private *cm_id_priv,
1523 const void *private_data,
1524 u8 private_data_len)
1525{
1526 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1527 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1528 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1529
1530 if (private_data && private_data_len)
1531 memcpy(rtu_msg->private_data, private_data, private_data_len);
1532}
1533
1534int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1535 const void *private_data,
1536 u8 private_data_len)
1537{
1538 struct cm_id_private *cm_id_priv;
1539 struct ib_mad_send_buf *msg;
a977049d
HR		 1540 unsigned long flags;
1541 void *data;
1542 int ret;
1543
1544 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1545 return -EINVAL;
1546
1547 data = cm_copy_private_data(private_data, private_data_len);
1548 if (IS_ERR(data))
1549 return PTR_ERR(data);
1550
1551 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1552 spin_lock_irqsave(&cm_id_priv->lock, flags);
1553 if (cm_id->state != IB_CM_REP_RCVD &&
1554 cm_id->state != IB_CM_MRA_REP_SENT) {
1555 ret = -EINVAL;
1556 goto error;
1557 }
1558
1559 ret = cm_alloc_msg(cm_id_priv, &msg);
1560 if (ret)
1561 goto error;
1562
1563 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1564 private_data, private_data_len);
1565
34816ad9 1566 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 1567 if (ret) {
1568 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1569 cm_free_msg(msg);
1570 kfree(data);
1571 return ret;
1572 }
1573
1574 cm_id->state = IB_CM_ESTABLISHED;
1575 cm_set_private_data(cm_id_priv, data, private_data_len);
1576 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1577 return 0;
1578
1579error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1580 kfree(data);
1581 return ret;
1582}
1583EXPORT_SYMBOL(ib_send_cm_rtu);
1584
1585static void cm_format_rep_event(struct cm_work *work)
1586{
1587 struct cm_rep_msg *rep_msg;
1588 struct ib_cm_rep_event_param *param;
1589
1590 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1591 param = &work->cm_event.param.rep_rcvd;
1592 param->remote_ca_guid = rep_msg->local_ca_guid;
1593 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1594 param->remote_qpn = be32_to_cpu(cm_rep_get_local_qpn(rep_msg));
1595 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1596 param->responder_resources = rep_msg->initiator_depth;
1597 param->initiator_depth = rep_msg->resp_resources;
1598 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1599 param->failover_accepted = cm_rep_get_failover(rep_msg);
1600 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1601 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1602 param->srq = cm_rep_get_srq(rep_msg);
1603 work->cm_event.private_data = &rep_msg->private_data;
1604}
1605
1606static void cm_dup_rep_handler(struct cm_work *work)
1607{
1608 struct cm_id_private *cm_id_priv;
1609 struct cm_rep_msg *rep_msg;
1610 struct ib_mad_send_buf *msg = NULL;
a977049d
HR		 1611 int ret;
1612
1613 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1614 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1615 rep_msg->local_comm_id);
1616 if (!cm_id_priv)
1617 return;
1618
1619 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1620 if (ret)
1621 goto deref;
1622
24be6e81 1623 spin_lock_irq(&cm_id_priv->lock);
a977049d
HR		 1624 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1625 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1626 cm_id_priv->private_data,
1627 cm_id_priv->private_data_len);
1628 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1629 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1630 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1631 cm_id_priv->private_data,
1632 cm_id_priv->private_data_len);
1633 else
1634 goto unlock;
24be6e81 1635 spin_unlock_irq(&cm_id_priv->lock);
a977049d 1636
34816ad9 1637 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 1638 if (ret)
1639 goto free;
1640 goto deref;
1641
24be6e81 1642unlock: spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 1643free: cm_free_msg(msg);
1644deref: cm_deref_id(cm_id_priv);
1645}
1646
1647static int cm_rep_handler(struct cm_work *work)
1648{
1649 struct cm_id_private *cm_id_priv;
1650 struct cm_rep_msg *rep_msg;
a977049d
HR		 1651 int ret;
1652
1653 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1654 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1655 if (!cm_id_priv) {
1656 cm_dup_rep_handler(work);
1657 return -EINVAL;
1658 }
1659
87fd1a11
SH		 1660 cm_format_rep_event(work);
1661
24be6e81 1662 spin_lock_irq(&cm_id_priv->lock);
87fd1a11
SH		 1663 switch (cm_id_priv->id.state) {
1664 case IB_CM_REQ_SENT:
1665 case IB_CM_MRA_REQ_RCVD:
1666 break;
1667 default:
24be6e81 1668 spin_unlock_irq(&cm_id_priv->lock);
87fd1a11
SH		 1669 ret = -EINVAL;
1670 goto error;
1671 }
1672
a977049d
HR		 1673 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1674 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1675 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1676
87fd1a11 1677 spin_lock(&cm.lock);
a977049d
HR		 1678 /* Check for duplicate REP. */
1679 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
87fd1a11 1680 spin_unlock(&cm.lock);
24be6e81 1681 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 1682 ret = -EINVAL;
1683 goto error;
1684 }
1685 /* Check for a stale connection. */
1686 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
87fd1a11
SH		 1687 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1688 &cm.remote_id_table);
1689 cm_id_priv->timewait_info->inserted_remote_id = 0;
1690 spin_unlock(&cm.lock);
24be6e81 1691 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 1692 cm_issue_rej(work->port, work->mad_recv_wc,
1693 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1694 NULL, 0);
1695 ret = -EINVAL;
1696 goto error;
1697 }
87fd1a11 1698 spin_unlock(&cm.lock);
a977049d 1699
a977049d
HR		 1700 cm_id_priv->id.state = IB_CM_REP_RCVD;
1701 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1702 cm_id_priv->remote_qpn = cm_rep_get_local_qpn(rep_msg);
1703 cm_id_priv->initiator_depth = rep_msg->resp_resources;
1704 cm_id_priv->responder_resources = rep_msg->initiator_depth;
1705 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1706 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1d846126
SH		 1707 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1708 cm_id_priv->av.timeout =
1709 cm_ack_timeout(cm_id_priv->target_ack_delay,
1710 cm_id_priv->av.timeout - 1);
1711 cm_id_priv->alt_av.timeout =
1712 cm_ack_timeout(cm_id_priv->target_ack_delay,
1713 cm_id_priv->alt_av.timeout - 1);
a977049d
HR		 1714
1715 /* todo: handle peer_to_peer */
1716
34816ad9 1717 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d
HR		 1718 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1719 if (!ret)
1720 list_add_tail(&work->list, &cm_id_priv->work_list);
24be6e81 1721 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 1722
1723 if (ret)
1724 cm_process_work(cm_id_priv, work);
1725 else
1726 cm_deref_id(cm_id_priv);
1727 return 0;
1728
87fd1a11 1729error:
a977049d
HR		 1730 cm_deref_id(cm_id_priv);
1731 return ret;
1732}
1733
1734static int cm_establish_handler(struct cm_work *work)
1735{
1736 struct cm_id_private *cm_id_priv;
a977049d
HR		 1737 int ret;
1738
e1444b5a 1739 /* See comment in cm_establish about lookup. */
a977049d
HR		 1740 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1741 if (!cm_id_priv)
1742 return -EINVAL;
1743
24be6e81 1744 spin_lock_irq(&cm_id_priv->lock);
a977049d 1745 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
24be6e81 1746 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 1747 goto out;
1748 }
1749
34816ad9 1750 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d
HR		 1751 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1752 if (!ret)
1753 list_add_tail(&work->list, &cm_id_priv->work_list);
24be6e81 1754 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 1755
1756 if (ret)
1757 cm_process_work(cm_id_priv, work);
1758 else
1759 cm_deref_id(cm_id_priv);
1760 return 0;
1761out:
1762 cm_deref_id(cm_id_priv);
1763 return -EINVAL;
1764}
1765
1766static int cm_rtu_handler(struct cm_work *work)
1767{
1768 struct cm_id_private *cm_id_priv;
1769 struct cm_rtu_msg *rtu_msg;
a977049d
HR		 1770 int ret;
1771
1772 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1773 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1774 rtu_msg->local_comm_id);
1775 if (!cm_id_priv)
1776 return -EINVAL;
1777
1778 work->cm_event.private_data = &rtu_msg->private_data;
1779
24be6e81 1780 spin_lock_irq(&cm_id_priv->lock);
a977049d
HR		 1781 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1782 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
24be6e81 1783 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 1784 goto out;
1785 }
1786 cm_id_priv->id.state = IB_CM_ESTABLISHED;
1787
34816ad9 1788 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d
HR		 1789 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1790 if (!ret)
1791 list_add_tail(&work->list, &cm_id_priv->work_list);
24be6e81 1792 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 1793
1794 if (ret)
1795 cm_process_work(cm_id_priv, work);
1796 else
1797 cm_deref_id(cm_id_priv);
1798 return 0;
1799out:
1800 cm_deref_id(cm_id_priv);
1801 return -EINVAL;
1802}
1803
1804static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1805 struct cm_id_private *cm_id_priv,
1806 const void *private_data,
1807 u8 private_data_len)
1808{
1809 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1810 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1811 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1812 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1813 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1814
1815 if (private_data && private_data_len)
1816 memcpy(dreq_msg->private_data, private_data, private_data_len);
1817}
1818
1819int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1820 const void *private_data,
1821 u8 private_data_len)
1822{
1823 struct cm_id_private *cm_id_priv;
1824 struct ib_mad_send_buf *msg;
a977049d
HR		 1825 unsigned long flags;
1826 int ret;
1827
1828 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1829 return -EINVAL;
1830
1831 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1832 spin_lock_irqsave(&cm_id_priv->lock, flags);
1833 if (cm_id->state != IB_CM_ESTABLISHED) {
1834 ret = -EINVAL;
1835 goto out;
1836 }
1837
1838 ret = cm_alloc_msg(cm_id_priv, &msg);
1839 if (ret) {
1840 cm_enter_timewait(cm_id_priv);
1841 goto out;
1842 }
1843
1844 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
1845 private_data, private_data_len);
34816ad9 1846 msg->timeout_ms = cm_id_priv->timeout_ms;
a977049d
HR		 1847 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
1848
34816ad9 1849 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 1850 if (ret) {
1851 cm_enter_timewait(cm_id_priv);
1852 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1853 cm_free_msg(msg);
1854 return ret;
1855 }
1856
1857 cm_id->state = IB_CM_DREQ_SENT;
1858 cm_id_priv->msg = msg;
1859out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1860 return ret;
1861}
1862EXPORT_SYMBOL(ib_send_cm_dreq);
1863
1864static void cm_format_drep(struct cm_drep_msg *drep_msg,
1865 struct cm_id_private *cm_id_priv,
1866 const void *private_data,
1867 u8 private_data_len)
1868{
1869 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
1870 drep_msg->local_comm_id = cm_id_priv->id.local_id;
1871 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1872
1873 if (private_data && private_data_len)
1874 memcpy(drep_msg->private_data, private_data, private_data_len);
1875}
1876
1877int ib_send_cm_drep(struct ib_cm_id *cm_id,
1878 const void *private_data,
1879 u8 private_data_len)
1880{
1881 struct cm_id_private *cm_id_priv;
1882 struct ib_mad_send_buf *msg;
a977049d
HR		 1883 unsigned long flags;
1884 void *data;
1885 int ret;
1886
1887 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
1888 return -EINVAL;
1889
1890 data = cm_copy_private_data(private_data, private_data_len);
1891 if (IS_ERR(data))
1892 return PTR_ERR(data);
1893
1894 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1895 spin_lock_irqsave(&cm_id_priv->lock, flags);
1896 if (cm_id->state != IB_CM_DREQ_RCVD) {
1897 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1898 kfree(data);
1899 return -EINVAL;
1900 }
1901
1902 cm_set_private_data(cm_id_priv, data, private_data_len);
1903 cm_enter_timewait(cm_id_priv);
1904
1905 ret = cm_alloc_msg(cm_id_priv, &msg);
1906 if (ret)
1907 goto out;
1908
1909 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1910 private_data, private_data_len);
1911
34816ad9 1912 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 1913 if (ret) {
1914 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1915 cm_free_msg(msg);
1916 return ret;
1917 }
1918
1919out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1920 return ret;
1921}
1922EXPORT_SYMBOL(ib_send_cm_drep);
1923
82a9c16a
SH		 1924static int cm_issue_drep(struct cm_port *port,
1925 struct ib_mad_recv_wc *mad_recv_wc)
1926{
1927 struct ib_mad_send_buf *msg = NULL;
1928 struct cm_dreq_msg *dreq_msg;
1929 struct cm_drep_msg *drep_msg;
1930 int ret;
1931
1932 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1933 if (ret)
1934 return ret;
1935
1936 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
1937 drep_msg = (struct cm_drep_msg *) msg->mad;
1938
1939 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
1940 drep_msg->remote_comm_id = dreq_msg->local_comm_id;
1941 drep_msg->local_comm_id = dreq_msg->remote_comm_id;
1942
1943 ret = ib_post_send_mad(msg, NULL);
1944 if (ret)
1945 cm_free_msg(msg);
1946
1947 return ret;
1948}
1949
a977049d
HR		 1950static int cm_dreq_handler(struct cm_work *work)
1951{
1952 struct cm_id_private *cm_id_priv;
1953 struct cm_dreq_msg *dreq_msg;
1954 struct ib_mad_send_buf *msg = NULL;
a977049d
HR		 1955 int ret;
1956
1957 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
1958 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
1959 dreq_msg->local_comm_id);
82a9c16a
SH		 1960 if (!cm_id_priv) {
1961 cm_issue_drep(work->port, work->mad_recv_wc);
a977049d 1962 return -EINVAL;
82a9c16a 1963 }
a977049d
HR		 1964
1965 work->cm_event.private_data = &dreq_msg->private_data;
1966
24be6e81 1967 spin_lock_irq(&cm_id_priv->lock);
a977049d
HR		 1968 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
1969 goto unlock;
1970
1971 switch (cm_id_priv->id.state) {
1972 case IB_CM_REP_SENT:
1973 case IB_CM_DREQ_SENT:
34816ad9 1974 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d
HR		 1975 break;
1976 case IB_CM_ESTABLISHED:
1977 case IB_CM_MRA_REP_RCVD:
1978 break;
1979 case IB_CM_TIMEWAIT:
1980 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
1981 goto unlock;
1982
1983 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
1984 cm_id_priv->private_data,
1985 cm_id_priv->private_data_len);
24be6e81 1986 spin_unlock_irq(&cm_id_priv->lock);
a977049d 1987
34816ad9 1988 if (ib_post_send_mad(msg, NULL))
a977049d
HR		 1989 cm_free_msg(msg);
1990 goto deref;
1991 default:
1992 goto unlock;
1993 }
1994 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
1995 cm_id_priv->tid = dreq_msg->hdr.tid;
1996 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1997 if (!ret)
1998 list_add_tail(&work->list, &cm_id_priv->work_list);
24be6e81 1999 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 2000
2001 if (ret)
2002 cm_process_work(cm_id_priv, work);
2003 else
2004 cm_deref_id(cm_id_priv);
2005 return 0;
2006
24be6e81 2007unlock: spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 2008deref: cm_deref_id(cm_id_priv);
2009 return -EINVAL;
2010}
2011
2012static int cm_drep_handler(struct cm_work *work)
2013{
2014 struct cm_id_private *cm_id_priv;
2015 struct cm_drep_msg *drep_msg;
a977049d
HR		 2016 int ret;
2017
2018 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2019 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2020 drep_msg->local_comm_id);
2021 if (!cm_id_priv)
2022 return -EINVAL;
2023
2024 work->cm_event.private_data = &drep_msg->private_data;
2025
24be6e81 2026 spin_lock_irq(&cm_id_priv->lock);
a977049d
HR		 2027 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2028 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
24be6e81 2029 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 2030 goto out;
2031 }
2032 cm_enter_timewait(cm_id_priv);
2033
34816ad9 2034 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d
HR		 2035 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2036 if (!ret)
2037 list_add_tail(&work->list, &cm_id_priv->work_list);
24be6e81 2038 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 2039
2040 if (ret)
2041 cm_process_work(cm_id_priv, work);
2042 else
2043 cm_deref_id(cm_id_priv);
2044 return 0;
2045out:
2046 cm_deref_id(cm_id_priv);
2047 return -EINVAL;
2048}
2049
2050int ib_send_cm_rej(struct ib_cm_id *cm_id,
2051 enum ib_cm_rej_reason reason,
2052 void *ari,
2053 u8 ari_length,
2054 const void *private_data,
2055 u8 private_data_len)
2056{
2057 struct cm_id_private *cm_id_priv;
2058 struct ib_mad_send_buf *msg;
a977049d
HR		 2059 unsigned long flags;
2060 int ret;
2061
2062 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2063 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2064 return -EINVAL;
2065
2066 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2067
2068 spin_lock_irqsave(&cm_id_priv->lock, flags);
2069 switch (cm_id->state) {
2070 case IB_CM_REQ_SENT:
2071 case IB_CM_MRA_REQ_RCVD:
2072 case IB_CM_REQ_RCVD:
2073 case IB_CM_MRA_REQ_SENT:
2074 case IB_CM_REP_RCVD:
2075 case IB_CM_MRA_REP_SENT:
2076 ret = cm_alloc_msg(cm_id_priv, &msg);
2077 if (!ret)
2078 cm_format_rej((struct cm_rej_msg *) msg->mad,
2079 cm_id_priv, reason, ari, ari_length,
2080 private_data, private_data_len);
2081
2082 cm_reset_to_idle(cm_id_priv);
2083 break;
2084 case IB_CM_REP_SENT:
2085 case IB_CM_MRA_REP_RCVD:
2086 ret = cm_alloc_msg(cm_id_priv, &msg);
2087 if (!ret)
2088 cm_format_rej((struct cm_rej_msg *) msg->mad,
2089 cm_id_priv, reason, ari, ari_length,
2090 private_data, private_data_len);
2091
2092 cm_enter_timewait(cm_id_priv);
2093 break;
2094 default:
2095 ret = -EINVAL;
2096 goto out;
2097 }
2098
2099 if (ret)
2100 goto out;
2101
34816ad9 2102 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 2103 if (ret)
2104 cm_free_msg(msg);
2105
2106out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2107 return ret;
2108}
2109EXPORT_SYMBOL(ib_send_cm_rej);
2110
2111static void cm_format_rej_event(struct cm_work *work)
2112{
2113 struct cm_rej_msg *rej_msg;
2114 struct ib_cm_rej_event_param *param;
2115
2116 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2117 param = &work->cm_event.param.rej_rcvd;
2118 param->ari = rej_msg->ari;
2119 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
97f52eb4 2120 param->reason = __be16_to_cpu(rej_msg->reason);
a977049d
HR		 2121 work->cm_event.private_data = &rej_msg->private_data;
2122}
2123
2124static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2125{
2126 struct cm_timewait_info *timewait_info;
2127 struct cm_id_private *cm_id_priv;
97f52eb4 2128 __be32 remote_id;
a977049d
HR		 2129
2130 remote_id = rej_msg->local_comm_id;
2131
97f52eb4 2132 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
24be6e81 2133 spin_lock_irq(&cm.lock);
97f52eb4 2134 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
a977049d
HR		 2135 remote_id);
2136 if (!timewait_info) {
24be6e81 2137 spin_unlock_irq(&cm.lock);
a977049d
HR		 2138 return NULL;
2139 }
f06d2653
SH		 2140 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2141 (timewait_info->work.local_id ^
2142 cm.random_id_operand));
a977049d
HR		 2143 if (cm_id_priv) {
2144 if (cm_id_priv->id.remote_id == remote_id)
2145 atomic_inc(&cm_id_priv->refcount);
2146 else
2147 cm_id_priv = NULL;
2148 }
24be6e81 2149 spin_unlock_irq(&cm.lock);
a977049d
HR		 2150 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2151 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2152 else
2153 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2154
2155 return cm_id_priv;
2156}
2157
2158static int cm_rej_handler(struct cm_work *work)
2159{
2160 struct cm_id_private *cm_id_priv;
2161 struct cm_rej_msg *rej_msg;
a977049d
HR		 2162 int ret;
2163
2164 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2165 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2166 if (!cm_id_priv)
2167 return -EINVAL;
2168
2169 cm_format_rej_event(work);
2170
24be6e81 2171 spin_lock_irq(&cm_id_priv->lock);
a977049d
HR		 2172 switch (cm_id_priv->id.state) {
2173 case IB_CM_REQ_SENT:
2174 case IB_CM_MRA_REQ_RCVD:
2175 case IB_CM_REP_SENT:
2176 case IB_CM_MRA_REP_RCVD:
34816ad9 2177 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d
HR		 2178 /* fall through */
2179 case IB_CM_REQ_RCVD:
2180 case IB_CM_MRA_REQ_SENT:
97f52eb4 2181 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
a977049d
HR		 2182 cm_enter_timewait(cm_id_priv);
2183 else
2184 cm_reset_to_idle(cm_id_priv);
2185 break;
2186 case IB_CM_DREQ_SENT:
34816ad9 2187 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d
HR		 2188 /* fall through */
2189 case IB_CM_REP_RCVD:
2190 case IB_CM_MRA_REP_SENT:
2191 case IB_CM_ESTABLISHED:
2192 cm_enter_timewait(cm_id_priv);
2193 break;
2194 default:
24be6e81 2195 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 2196 ret = -EINVAL;
2197 goto out;
2198 }
2199
2200 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2201 if (!ret)
2202 list_add_tail(&work->list, &cm_id_priv->work_list);
24be6e81 2203 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 2204
2205 if (ret)
2206 cm_process_work(cm_id_priv, work);
2207 else
2208 cm_deref_id(cm_id_priv);
2209 return 0;
2210out:
2211 cm_deref_id(cm_id_priv);
2212 return -EINVAL;
2213}
2214
2215int ib_send_cm_mra(struct ib_cm_id *cm_id,
2216 u8 service_timeout,
2217 const void *private_data,
2218 u8 private_data_len)
2219{
2220 struct cm_id_private *cm_id_priv;
2221 struct ib_mad_send_buf *msg;
a977049d
HR		 2222 void *data;
2223 unsigned long flags;
2224 int ret;
2225
2226 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2227 return -EINVAL;
2228
2229 data = cm_copy_private_data(private_data, private_data_len);
2230 if (IS_ERR(data))
2231 return PTR_ERR(data);
2232
2233 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2234
2235 spin_lock_irqsave(&cm_id_priv->lock, flags);
2236 switch(cm_id_priv->id.state) {
2237 case IB_CM_REQ_RCVD:
2238 ret = cm_alloc_msg(cm_id_priv, &msg);
2239 if (ret)
2240 goto error1;
2241
2242 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2243 CM_MSG_RESPONSE_REQ, service_timeout,
2244 private_data, private_data_len);
34816ad9 2245 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 2246 if (ret)
2247 goto error2;
2248 cm_id->state = IB_CM_MRA_REQ_SENT;
2249 break;
2250 case IB_CM_REP_RCVD:
2251 ret = cm_alloc_msg(cm_id_priv, &msg);
2252 if (ret)
2253 goto error1;
2254
2255 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2256 CM_MSG_RESPONSE_REP, service_timeout,
2257 private_data, private_data_len);
34816ad9 2258 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 2259 if (ret)
2260 goto error2;
2261 cm_id->state = IB_CM_MRA_REP_SENT;
2262 break;
2263 case IB_CM_ESTABLISHED:
2264 ret = cm_alloc_msg(cm_id_priv, &msg);
2265 if (ret)
2266 goto error1;
2267
2268 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2269 CM_MSG_RESPONSE_OTHER, service_timeout,
2270 private_data, private_data_len);
34816ad9 2271 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 2272 if (ret)
2273 goto error2;
2274 cm_id->lap_state = IB_CM_MRA_LAP_SENT;
2275 break;
2276 default:
2277 ret = -EINVAL;
2278 goto error1;
2279 }
2280 cm_id_priv->service_timeout = service_timeout;
2281 cm_set_private_data(cm_id_priv, data, private_data_len);
2282 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2283 return 0;
2284
2285error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2286 kfree(data);
2287 return ret;
2288
2289error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2290 kfree(data);
2291 cm_free_msg(msg);
2292 return ret;
2293}
2294EXPORT_SYMBOL(ib_send_cm_mra);
2295
2296static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2297{
2298 switch (cm_mra_get_msg_mraed(mra_msg)) {
2299 case CM_MSG_RESPONSE_REQ:
2300 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2301 case CM_MSG_RESPONSE_REP:
2302 case CM_MSG_RESPONSE_OTHER:
2303 return cm_acquire_id(mra_msg->remote_comm_id,
2304 mra_msg->local_comm_id);
2305 default:
2306 return NULL;
2307 }
2308}
2309
2310static int cm_mra_handler(struct cm_work *work)
2311{
2312 struct cm_id_private *cm_id_priv;
2313 struct cm_mra_msg *mra_msg;
a977049d
HR		 2314 int timeout, ret;
2315
2316 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2317 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2318 if (!cm_id_priv)
2319 return -EINVAL;
2320
2321 work->cm_event.private_data = &mra_msg->private_data;
2322 work->cm_event.param.mra_rcvd.service_timeout =
2323 cm_mra_get_service_timeout(mra_msg);
2324 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
1d846126 2325 cm_convert_to_ms(cm_id_priv->av.timeout);
a977049d 2326
24be6e81 2327 spin_lock_irq(&cm_id_priv->lock);
a977049d
HR		 2328 switch (cm_id_priv->id.state) {
2329 case IB_CM_REQ_SENT:
2330 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2331 ib_modify_mad(cm_id_priv->av.port->mad_agent,
34816ad9 2332 cm_id_priv->msg, timeout))
a977049d
HR		 2333 goto out;
2334 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2335 break;
2336 case IB_CM_REP_SENT:
2337 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2338 ib_modify_mad(cm_id_priv->av.port->mad_agent,
34816ad9 2339 cm_id_priv->msg, timeout))
a977049d
HR		 2340 goto out;
2341 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2342 break;
2343 case IB_CM_ESTABLISHED:
2344 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2345 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2346 ib_modify_mad(cm_id_priv->av.port->mad_agent,
34816ad9 2347 cm_id_priv->msg, timeout))
a977049d
HR		 2348 goto out;
2349 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2350 break;
2351 default:
2352 goto out;
2353 }
2354
2355 cm_id_priv->msg->context[1] = (void *) (unsigned long)
2356 cm_id_priv->id.state;
2357 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2358 if (!ret)
2359 list_add_tail(&work->list, &cm_id_priv->work_list);
24be6e81 2360 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 2361
2362 if (ret)
2363 cm_process_work(cm_id_priv, work);
2364 else
2365 cm_deref_id(cm_id_priv);
2366 return 0;
2367out:
24be6e81 2368 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 2369 cm_deref_id(cm_id_priv);
2370 return -EINVAL;
2371}
2372
2373static void cm_format_lap(struct cm_lap_msg *lap_msg,
2374 struct cm_id_private *cm_id_priv,
2375 struct ib_sa_path_rec *alternate_path,
2376 const void *private_data,
2377 u8 private_data_len)
2378{
2379 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2380 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2381 lap_msg->local_comm_id = cm_id_priv->id.local_id;
2382 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2383 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2384 /* todo: need remote CM response timeout */
2385 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2386 lap_msg->alt_local_lid = alternate_path->slid;
2387 lap_msg->alt_remote_lid = alternate_path->dlid;
2388 lap_msg->alt_local_gid = alternate_path->sgid;
2389 lap_msg->alt_remote_gid = alternate_path->dgid;
2390 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2391 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2392 lap_msg->alt_hop_limit = alternate_path->hop_limit;
2393 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2394 cm_lap_set_sl(lap_msg, alternate_path->sl);
2395 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2396 cm_lap_set_local_ack_timeout(lap_msg,
1d846126
SH		 2397 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
2398 alternate_path->packet_life_time));
a977049d
HR		 2399
2400 if (private_data && private_data_len)
2401 memcpy(lap_msg->private_data, private_data, private_data_len);
2402}
2403
2404int ib_send_cm_lap(struct ib_cm_id *cm_id,
2405 struct ib_sa_path_rec *alternate_path,
2406 const void *private_data,
2407 u8 private_data_len)
2408{
2409 struct cm_id_private *cm_id_priv;
2410 struct ib_mad_send_buf *msg;
a977049d
HR		 2411 unsigned long flags;
2412 int ret;
2413
2414 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2415 return -EINVAL;
2416
2417 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2418 spin_lock_irqsave(&cm_id_priv->lock, flags);
2419 if (cm_id->state != IB_CM_ESTABLISHED ||
e1444b5a
SH		 2420 (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2421 cm_id->lap_state != IB_CM_LAP_IDLE)) {
a977049d
HR		 2422 ret = -EINVAL;
2423 goto out;
2424 }
2425
e1444b5a
SH		 2426 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
2427 if (ret)
2428 goto out;
1d846126
SH		 2429 cm_id_priv->alt_av.timeout =
2430 cm_ack_timeout(cm_id_priv->target_ack_delay,
2431 cm_id_priv->alt_av.timeout - 1);
e1444b5a 2432
a977049d
HR		 2433 ret = cm_alloc_msg(cm_id_priv, &msg);
2434 if (ret)
2435 goto out;
2436
2437 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2438 alternate_path, private_data, private_data_len);
34816ad9 2439 msg->timeout_ms = cm_id_priv->timeout_ms;
a977049d
HR		 2440 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2441
34816ad9 2442 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 2443 if (ret) {
2444 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2445 cm_free_msg(msg);
2446 return ret;
2447 }
2448
2449 cm_id->lap_state = IB_CM_LAP_SENT;
2450 cm_id_priv->msg = msg;
2451
2452out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2453 return ret;
2454}
2455EXPORT_SYMBOL(ib_send_cm_lap);
2456
e1444b5a
SH		 2457static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2458 struct ib_sa_path_rec *path,
a977049d
HR		 2459 struct cm_lap_msg *lap_msg)
2460{
2461 memset(path, 0, sizeof *path);
2462 path->dgid = lap_msg->alt_local_gid;
2463 path->sgid = lap_msg->alt_remote_gid;
2464 path->dlid = lap_msg->alt_local_lid;
2465 path->slid = lap_msg->alt_remote_lid;
2466 path->flow_label = cm_lap_get_flow_label(lap_msg);
2467 path->hop_limit = lap_msg->alt_hop_limit;
2468 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2469 path->reversible = 1;
e1444b5a 2470 path->pkey = cm_id_priv->pkey;
a977049d
HR		 2471 path->sl = cm_lap_get_sl(lap_msg);
2472 path->mtu_selector = IB_SA_EQ;
e1444b5a 2473 path->mtu = cm_id_priv->path_mtu;
a977049d
HR		 2474 path->rate_selector = IB_SA_EQ;
2475 path->rate = cm_lap_get_packet_rate(lap_msg);
2476 path->packet_life_time_selector = IB_SA_EQ;
2477 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2478 path->packet_life_time -= (path->packet_life_time > 0);
2479}
2480
2481static int cm_lap_handler(struct cm_work *work)
2482{
2483 struct cm_id_private *cm_id_priv;
2484 struct cm_lap_msg *lap_msg;
2485 struct ib_cm_lap_event_param *param;
2486 struct ib_mad_send_buf *msg = NULL;
a977049d
HR		 2487 int ret;
2488
2489 /* todo: verify LAP request and send reject APR if invalid. */
2490 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2491 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2492 lap_msg->local_comm_id);
2493 if (!cm_id_priv)
2494 return -EINVAL;
2495
2496 param = &work->cm_event.param.lap_rcvd;
2497 param->alternate_path = &work->path[0];
e1444b5a 2498 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
a977049d
HR		 2499 work->cm_event.private_data = &lap_msg->private_data;
2500
24be6e81 2501 spin_lock_irq(&cm_id_priv->lock);
a977049d
HR		 2502 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2503 goto unlock;
2504
2505 switch (cm_id_priv->id.lap_state) {
e1444b5a 2506 case IB_CM_LAP_UNINIT:
a977049d
HR		 2507 case IB_CM_LAP_IDLE:
2508 break;
2509 case IB_CM_MRA_LAP_SENT:
2510 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2511 goto unlock;
2512
2513 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2514 CM_MSG_RESPONSE_OTHER,
2515 cm_id_priv->service_timeout,
2516 cm_id_priv->private_data,
2517 cm_id_priv->private_data_len);
24be6e81 2518 spin_unlock_irq(&cm_id_priv->lock);
a977049d 2519
34816ad9 2520 if (ib_post_send_mad(msg, NULL))
a977049d
HR		 2521 cm_free_msg(msg);
2522 goto deref;
2523 default:
2524 goto unlock;
2525 }
2526
2527 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2528 cm_id_priv->tid = lap_msg->hdr.tid;
e1444b5a
SH		 2529 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2530 work->mad_recv_wc->recv_buf.grh,
2531 &cm_id_priv->av);
2532 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
a977049d
HR		 2533 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2534 if (!ret)
2535 list_add_tail(&work->list, &cm_id_priv->work_list);
24be6e81 2536 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 2537
2538 if (ret)
2539 cm_process_work(cm_id_priv, work);
2540 else
2541 cm_deref_id(cm_id_priv);
2542 return 0;
2543
24be6e81 2544unlock: spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 2545deref: cm_deref_id(cm_id_priv);
2546 return -EINVAL;
2547}
2548
2549static void cm_format_apr(struct cm_apr_msg *apr_msg,
2550 struct cm_id_private *cm_id_priv,
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 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2558 apr_msg->local_comm_id = cm_id_priv->id.local_id;
2559 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2560 apr_msg->ap_status = (u8) status;
2561
2562 if (info && info_length) {
2563 apr_msg->info_length = info_length;
2564 memcpy(apr_msg->info, info, info_length);
2565 }
2566
2567 if (private_data && private_data_len)
2568 memcpy(apr_msg->private_data, private_data, private_data_len);
2569}
2570
2571int ib_send_cm_apr(struct ib_cm_id *cm_id,
2572 enum ib_cm_apr_status status,
2573 void *info,
2574 u8 info_length,
2575 const void *private_data,
2576 u8 private_data_len)
2577{
2578 struct cm_id_private *cm_id_priv;
2579 struct ib_mad_send_buf *msg;
a977049d
HR		 2580 unsigned long flags;
2581 int ret;
2582
2583 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2584 (info && info_length > IB_CM_APR_INFO_LENGTH))
2585 return -EINVAL;
2586
2587 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2588 spin_lock_irqsave(&cm_id_priv->lock, flags);
2589 if (cm_id->state != IB_CM_ESTABLISHED ||
2590 (cm_id->lap_state != IB_CM_LAP_RCVD &&
2591 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2592 ret = -EINVAL;
2593 goto out;
2594 }
2595
2596 ret = cm_alloc_msg(cm_id_priv, &msg);
2597 if (ret)
2598 goto out;
2599
2600 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2601 info, info_length, private_data, private_data_len);
34816ad9 2602 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 2603 if (ret) {
2604 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2605 cm_free_msg(msg);
2606 return ret;
2607 }
2608
2609 cm_id->lap_state = IB_CM_LAP_IDLE;
2610out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2611 return ret;
2612}
2613EXPORT_SYMBOL(ib_send_cm_apr);
2614
2615static int cm_apr_handler(struct cm_work *work)
2616{
2617 struct cm_id_private *cm_id_priv;
2618 struct cm_apr_msg *apr_msg;
a977049d
HR		 2619 int ret;
2620
2621 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2622 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2623 apr_msg->local_comm_id);
2624 if (!cm_id_priv)
2625 return -EINVAL; /* Unmatched reply. */
2626
2627 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2628 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2629 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2630 work->cm_event.private_data = &apr_msg->private_data;
2631
24be6e81 2632 spin_lock_irq(&cm_id_priv->lock);
a977049d
HR		 2633 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2634 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2635 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
24be6e81 2636 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 2637 goto out;
2638 }
2639 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
34816ad9 2640 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
a977049d
HR		 2641 cm_id_priv->msg = NULL;
2642
2643 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2644 if (!ret)
2645 list_add_tail(&work->list, &cm_id_priv->work_list);
24be6e81 2646 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 2647
2648 if (ret)
2649 cm_process_work(cm_id_priv, work);
2650 else
2651 cm_deref_id(cm_id_priv);
2652 return 0;
2653out:
2654 cm_deref_id(cm_id_priv);
2655 return -EINVAL;
2656}
2657
2658static int cm_timewait_handler(struct cm_work *work)
2659{
2660 struct cm_timewait_info *timewait_info;
2661 struct cm_id_private *cm_id_priv;
a977049d
HR		 2662 int ret;
2663
2664 timewait_info = (struct cm_timewait_info *)work;
8575329d
SH		 2665 spin_lock_irq(&cm.lock);
2666 list_del(&timewait_info->list);
2667 spin_unlock_irq(&cm.lock);
a977049d
HR		 2668
2669 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2670 timewait_info->work.remote_id);
2671 if (!cm_id_priv)
2672 return -EINVAL;
2673
8575329d 2674 spin_lock_irq(&cm_id_priv->lock);
a977049d
HR		 2675 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2676 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
8575329d 2677 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 2678 goto out;
2679 }
2680 cm_id_priv->id.state = IB_CM_IDLE;
2681 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2682 if (!ret)
2683 list_add_tail(&work->list, &cm_id_priv->work_list);
8575329d 2684 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 2685
2686 if (ret)
2687 cm_process_work(cm_id_priv, work);
2688 else
2689 cm_deref_id(cm_id_priv);
2690 return 0;
2691out:
2692 cm_deref_id(cm_id_priv);
2693 return -EINVAL;
2694}
2695
2696static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2697 struct cm_id_private *cm_id_priv,
2698 struct ib_cm_sidr_req_param *param)
2699{
2700 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2701 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2702 sidr_req_msg->request_id = cm_id_priv->id.local_id;
75af9088 2703 sidr_req_msg->pkey = cpu_to_be16(param->path->pkey);
a977049d
HR		 2704 sidr_req_msg->service_id = param->service_id;
2705
2706 if (param->private_data && param->private_data_len)
2707 memcpy(sidr_req_msg->private_data, param->private_data,
2708 param->private_data_len);
2709}
2710
2711int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2712 struct ib_cm_sidr_req_param *param)
2713{
2714 struct cm_id_private *cm_id_priv;
2715 struct ib_mad_send_buf *msg;
a977049d
HR		 2716 unsigned long flags;
2717 int ret;
2718
2719 if (!param->path || (param->private_data &&
2720 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2721 return -EINVAL;
2722
2723 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2724 ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2725 if (ret)
2726 goto out;
2727
2728 cm_id->service_id = param->service_id;
97f52eb4 2729 cm_id->service_mask = __constant_cpu_to_be64(~0ULL);
a977049d
HR		 2730 cm_id_priv->timeout_ms = param->timeout_ms;
2731 cm_id_priv->max_cm_retries = param->max_cm_retries;
2732 ret = cm_alloc_msg(cm_id_priv, &msg);
2733 if (ret)
2734 goto out;
2735
2736 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2737 param);
34816ad9 2738 msg->timeout_ms = cm_id_priv->timeout_ms;
a977049d
HR		 2739 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2740
2741 spin_lock_irqsave(&cm_id_priv->lock, flags);
2742 if (cm_id->state == IB_CM_IDLE)
34816ad9 2743 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 2744 else
2745 ret = -EINVAL;
2746
2747 if (ret) {
2748 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2749 cm_free_msg(msg);
2750 goto out;
2751 }
2752 cm_id->state = IB_CM_SIDR_REQ_SENT;
2753 cm_id_priv->msg = msg;
2754 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2755out:
2756 return ret;
2757}
2758EXPORT_SYMBOL(ib_send_cm_sidr_req);
2759
2760static void cm_format_sidr_req_event(struct cm_work *work,
2761 struct ib_cm_id *listen_id)
2762{
2763 struct cm_sidr_req_msg *sidr_req_msg;
2764 struct ib_cm_sidr_req_event_param *param;
2765
2766 sidr_req_msg = (struct cm_sidr_req_msg *)
2767 work->mad_recv_wc->recv_buf.mad;
2768 param = &work->cm_event.param.sidr_req_rcvd;
97f52eb4 2769 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
a977049d 2770 param->listen_id = listen_id;
a977049d
HR		 2771 param->port = work->port->port_num;
2772 work->cm_event.private_data = &sidr_req_msg->private_data;
2773}
2774
2775static int cm_sidr_req_handler(struct cm_work *work)
2776{
2777 struct ib_cm_id *cm_id;
2778 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2779 struct cm_sidr_req_msg *sidr_req_msg;
2780 struct ib_wc *wc;
a977049d 2781
07d357d0 2782 cm_id = ib_create_cm_id(work->port->cm_dev->device, NULL, NULL);
a977049d
HR		 2783 if (IS_ERR(cm_id))
2784 return PTR_ERR(cm_id);
2785 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2786
2787 /* Record SGID/SLID and request ID for lookup. */
2788 sidr_req_msg = (struct cm_sidr_req_msg *)
2789 work->mad_recv_wc->recv_buf.mad;
2790 wc = work->mad_recv_wc->wc;
97f52eb4 2791 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
a977049d
HR		 2792 cm_id_priv->av.dgid.global.interface_id = 0;
2793 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
ca222c6b 2794 work->mad_recv_wc->recv_buf.grh,
a977049d
HR		 2795 &cm_id_priv->av);
2796 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
a977049d
HR		 2797 cm_id_priv->tid = sidr_req_msg->hdr.tid;
2798 atomic_inc(&cm_id_priv->work_count);
2799
24be6e81 2800 spin_lock_irq(&cm.lock);
a977049d
HR		 2801 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
2802 if (cur_cm_id_priv) {
24be6e81 2803 spin_unlock_irq(&cm.lock);
a977049d
HR		 2804 goto out; /* Duplicate message. */
2805 }
29c2731c 2806 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
07d357d0 2807 cur_cm_id_priv = cm_find_listen(cm_id->device,
6e61d04f
SH		 2808 sidr_req_msg->service_id,
2809 sidr_req_msg->private_data);
a977049d
HR		 2810 if (!cur_cm_id_priv) {
2811 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
24be6e81 2812 spin_unlock_irq(&cm.lock);
a977049d
HR		 2813 /* todo: reply with no match */
2814 goto out; /* No match. */
2815 }
2816 atomic_inc(&cur_cm_id_priv->refcount);
24be6e81 2817 spin_unlock_irq(&cm.lock);
a977049d
HR		 2818
2819 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
2820 cm_id_priv->id.context = cur_cm_id_priv->id.context;
2821 cm_id_priv->id.service_id = sidr_req_msg->service_id;
97f52eb4 2822 cm_id_priv->id.service_mask = __constant_cpu_to_be64(~0ULL);
a977049d
HR		 2823
2824 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
2825 cm_process_work(cm_id_priv, work);
2826 cm_deref_id(cur_cm_id_priv);
2827 return 0;
2828out:
2829 ib_destroy_cm_id(&cm_id_priv->id);
2830 return -EINVAL;
2831}
2832
2833static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
2834 struct cm_id_private *cm_id_priv,
2835 struct ib_cm_sidr_rep_param *param)
2836{
2837 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
2838 cm_id_priv->tid);
2839 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
2840 sidr_rep_msg->status = param->status;
2841 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
2842 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
2843 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
2844
2845 if (param->info && param->info_length)
2846 memcpy(sidr_rep_msg->info, param->info, param->info_length);
2847
2848 if (param->private_data && param->private_data_len)
2849 memcpy(sidr_rep_msg->private_data, param->private_data,
2850 param->private_data_len);
2851}
2852
2853int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
2854 struct ib_cm_sidr_rep_param *param)
2855{
2856 struct cm_id_private *cm_id_priv;
2857 struct ib_mad_send_buf *msg;
a977049d
HR		 2858 unsigned long flags;
2859 int ret;
2860
2861 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
2862 (param->private_data &&
2863 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
2864 return -EINVAL;
2865
2866 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2867 spin_lock_irqsave(&cm_id_priv->lock, flags);
2868 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
2869 ret = -EINVAL;
2870 goto error;
2871 }
2872
2873 ret = cm_alloc_msg(cm_id_priv, &msg);
2874 if (ret)
2875 goto error;
2876
2877 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
2878 param);
34816ad9 2879 ret = ib_post_send_mad(msg, NULL);
a977049d
HR		 2880 if (ret) {
2881 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2882 cm_free_msg(msg);
2883 return ret;
2884 }
2885 cm_id->state = IB_CM_IDLE;
2886 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2887
2888 spin_lock_irqsave(&cm.lock, flags);
2889 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
2890 spin_unlock_irqrestore(&cm.lock, flags);
2891 return 0;
2892
2893error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2894 return ret;
2895}
2896EXPORT_SYMBOL(ib_send_cm_sidr_rep);
2897
2898static void cm_format_sidr_rep_event(struct cm_work *work)
2899{
2900 struct cm_sidr_rep_msg *sidr_rep_msg;
2901 struct ib_cm_sidr_rep_event_param *param;
2902
2903 sidr_rep_msg = (struct cm_sidr_rep_msg *)
2904 work->mad_recv_wc->recv_buf.mad;
2905 param = &work->cm_event.param.sidr_rep_rcvd;
2906 param->status = sidr_rep_msg->status;
2907 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
2908 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
2909 param->info = &sidr_rep_msg->info;
2910 param->info_len = sidr_rep_msg->info_length;
2911 work->cm_event.private_data = &sidr_rep_msg->private_data;
2912}
2913
2914static int cm_sidr_rep_handler(struct cm_work *work)
2915{
2916 struct cm_sidr_rep_msg *sidr_rep_msg;
2917 struct cm_id_private *cm_id_priv;
a977049d
HR		 2918
2919 sidr_rep_msg = (struct cm_sidr_rep_msg *)
2920 work->mad_recv_wc->recv_buf.mad;
2921 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
2922 if (!cm_id_priv)
2923 return -EINVAL; /* Unmatched reply. */
2924
24be6e81 2925 spin_lock_irq(&cm_id_priv->lock);
a977049d 2926 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
24be6e81 2927 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 2928 goto out;
2929 }
2930 cm_id_priv->id.state = IB_CM_IDLE;
34816ad9 2931 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
24be6e81 2932 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 2933
2934 cm_format_sidr_rep_event(work);
2935 cm_process_work(cm_id_priv, work);
2936 return 0;
2937out:
2938 cm_deref_id(cm_id_priv);
2939 return -EINVAL;
2940}
2941
2942static void cm_process_send_error(struct ib_mad_send_buf *msg,
2943 enum ib_wc_status wc_status)
2944{
2945 struct cm_id_private *cm_id_priv;
2946 struct ib_cm_event cm_event;
2947 enum ib_cm_state state;
a977049d
HR		 2948 int ret;
2949
2950 memset(&cm_event, 0, sizeof cm_event);
2951 cm_id_priv = msg->context[0];
2952
2953 /* Discard old sends or ones without a response. */
24be6e81 2954 spin_lock_irq(&cm_id_priv->lock);
a977049d
HR		 2955 state = (enum ib_cm_state) (unsigned long) msg->context[1];
2956 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
2957 goto discard;
2958
2959 switch (state) {
2960 case IB_CM_REQ_SENT:
2961 case IB_CM_MRA_REQ_RCVD:
2962 cm_reset_to_idle(cm_id_priv);
2963 cm_event.event = IB_CM_REQ_ERROR;
2964 break;
2965 case IB_CM_REP_SENT:
2966 case IB_CM_MRA_REP_RCVD:
2967 cm_reset_to_idle(cm_id_priv);
2968 cm_event.event = IB_CM_REP_ERROR;
2969 break;
2970 case IB_CM_DREQ_SENT:
2971 cm_enter_timewait(cm_id_priv);
2972 cm_event.event = IB_CM_DREQ_ERROR;
2973 break;
2974 case IB_CM_SIDR_REQ_SENT:
2975 cm_id_priv->id.state = IB_CM_IDLE;
2976 cm_event.event = IB_CM_SIDR_REQ_ERROR;
2977 break;
2978 default:
2979 goto discard;
2980 }
24be6e81 2981 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 2982 cm_event.param.send_status = wc_status;
2983
2984 /* No other events can occur on the cm_id at this point. */
2985 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
2986 cm_free_msg(msg);
2987 if (ret)
2988 ib_destroy_cm_id(&cm_id_priv->id);
2989 return;
2990discard:
24be6e81 2991 spin_unlock_irq(&cm_id_priv->lock);
a977049d
HR		 2992 cm_free_msg(msg);
2993}
2994
2995static void cm_send_handler(struct ib_mad_agent *mad_agent,
2996 struct ib_mad_send_wc *mad_send_wc)
2997{
34816ad9 2998 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
a977049d
HR		 2999
3000 switch (mad_send_wc->status) {
3001 case IB_WC_SUCCESS:
3002 case IB_WC_WR_FLUSH_ERR:
3003 cm_free_msg(msg);
3004 break;
3005 default:
3006 if (msg->context[0] && msg->context[1])
3007 cm_process_send_error(msg, mad_send_wc->status);
3008 else
3009 cm_free_msg(msg);
3010 break;
3011 }
3012}
3013
c4028958 3014static void cm_work_handler(struct work_struct *_work)
a977049d 3015{
c4028958 3016 struct cm_work *work = container_of(_work, struct cm_work, work.work);
a977049d
HR		 3017 int ret;
3018
3019 switch (work->cm_event.event) {
3020 case IB_CM_REQ_RECEIVED:
3021 ret = cm_req_handler(work);
3022 break;
3023 case IB_CM_MRA_RECEIVED:
3024 ret = cm_mra_handler(work);
3025 break;
3026 case IB_CM_REJ_RECEIVED:
3027 ret = cm_rej_handler(work);
3028 break;
3029 case IB_CM_REP_RECEIVED:
3030 ret = cm_rep_handler(work);
3031 break;
3032 case IB_CM_RTU_RECEIVED:
3033 ret = cm_rtu_handler(work);
3034 break;
3035 case IB_CM_USER_ESTABLISHED:
3036 ret = cm_establish_handler(work);
3037 break;
3038 case IB_CM_DREQ_RECEIVED:
3039 ret = cm_dreq_handler(work);
3040 break;
3041 case IB_CM_DREP_RECEIVED:
3042 ret = cm_drep_handler(work);
3043 break;
3044 case IB_CM_SIDR_REQ_RECEIVED:
3045 ret = cm_sidr_req_handler(work);
3046 break;
3047 case IB_CM_SIDR_REP_RECEIVED:
3048 ret = cm_sidr_rep_handler(work);
3049 break;
3050 case IB_CM_LAP_RECEIVED:
3051 ret = cm_lap_handler(work);
3052 break;
3053 case IB_CM_APR_RECEIVED:
3054 ret = cm_apr_handler(work);
3055 break;
3056 case IB_CM_TIMEWAIT_EXIT:
3057 ret = cm_timewait_handler(work);
3058 break;
3059 default:
3060 ret = -EINVAL;
3061 break;
3062 }
3063 if (ret)
3064 cm_free_work(work);
3065}
3066
e1444b5a 3067static int cm_establish(struct ib_cm_id *cm_id)
a977049d
HR		 3068{
3069 struct cm_id_private *cm_id_priv;
3070 struct cm_work *work;
3071 unsigned long flags;
3072 int ret = 0;
3073
3074 work = kmalloc(sizeof *work, GFP_ATOMIC);
3075 if (!work)
3076 return -ENOMEM;
3077
3078 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3079 spin_lock_irqsave(&cm_id_priv->lock, flags);
3080 switch (cm_id->state)
3081 {
3082 case IB_CM_REP_SENT:
3083 case IB_CM_MRA_REP_RCVD:
3084 cm_id->state = IB_CM_ESTABLISHED;
3085 break;
3086 case IB_CM_ESTABLISHED:
3087 ret = -EISCONN;
3088 break;
3089 default:
3090 ret = -EINVAL;
3091 break;
3092 }
3093 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3094
3095 if (ret) {
3096 kfree(work);
3097 goto out;
3098 }
3099
3100 /*
3101 * The CM worker thread may try to destroy the cm_id before it
3102 * can execute this work item. To prevent potential deadlock,
3103 * we need to find the cm_id once we're in the context of the
3104 * worker thread, rather than holding a reference on it.
3105 */
c4028958 3106 INIT_DELAYED_WORK(&work->work, cm_work_handler);
a977049d
HR		 3107 work->local_id = cm_id->local_id;
3108 work->remote_id = cm_id->remote_id;
3109 work->mad_recv_wc = NULL;
3110 work->cm_event.event = IB_CM_USER_ESTABLISHED;
c4028958 3111 queue_delayed_work(cm.wq, &work->work, 0);
a977049d
HR		 3112out:
3113 return ret;
3114}
e1444b5a
SH		 3115
3116static int cm_migrate(struct ib_cm_id *cm_id)
3117{
3118 struct cm_id_private *cm_id_priv;
3119 unsigned long flags;
3120 int ret = 0;
3121
3122 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3123 spin_lock_irqsave(&cm_id_priv->lock, flags);
3124 if (cm_id->state == IB_CM_ESTABLISHED &&
3125 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3126 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3127 cm_id->lap_state = IB_CM_LAP_IDLE;
3128 cm_id_priv->av = cm_id_priv->alt_av;
3129 } else
3130 ret = -EINVAL;
3131 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3132
3133 return ret;
3134}
3135
3136int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3137{
3138 int ret;
3139
3140 switch (event) {
3141 case IB_EVENT_COMM_EST:
3142 ret = cm_establish(cm_id);
3143 break;
3144 case IB_EVENT_PATH_MIG:
3145 ret = cm_migrate(cm_id);
3146 break;
3147 default:
3148 ret = -EINVAL;
3149 }
3150 return ret;
3151}
3152EXPORT_SYMBOL(ib_cm_notify);
a977049d
HR		 3153
3154static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3155 struct ib_mad_recv_wc *mad_recv_wc)
3156{
3157 struct cm_work *work;
3158 enum ib_cm_event_type event;
3159 int paths = 0;
3160
3161 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3162 case CM_REQ_ATTR_ID:
3163 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3164 alt_local_lid != 0);
3165 event = IB_CM_REQ_RECEIVED;
3166 break;
3167 case CM_MRA_ATTR_ID:
3168 event = IB_CM_MRA_RECEIVED;
3169 break;
3170 case CM_REJ_ATTR_ID:
3171 event = IB_CM_REJ_RECEIVED;
3172 break;
3173 case CM_REP_ATTR_ID:
3174 event = IB_CM_REP_RECEIVED;
3175 break;
3176 case CM_RTU_ATTR_ID:
3177 event = IB_CM_RTU_RECEIVED;
3178 break;
3179 case CM_DREQ_ATTR_ID:
3180 event = IB_CM_DREQ_RECEIVED;
3181 break;
3182 case CM_DREP_ATTR_ID:
3183 event = IB_CM_DREP_RECEIVED;
3184 break;
3185 case CM_SIDR_REQ_ATTR_ID:
3186 event = IB_CM_SIDR_REQ_RECEIVED;
3187 break;
3188 case CM_SIDR_REP_ATTR_ID:
3189 event = IB_CM_SIDR_REP_RECEIVED;
3190 break;
3191 case CM_LAP_ATTR_ID:
3192 paths = 1;
3193 event = IB_CM_LAP_RECEIVED;
3194 break;
3195 case CM_APR_ATTR_ID:
3196 event = IB_CM_APR_RECEIVED;
3197 break;
3198 default:
3199 ib_free_recv_mad(mad_recv_wc);
3200 return;
3201 }
3202
3203 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3204 GFP_KERNEL);
3205 if (!work) {
3206 ib_free_recv_mad(mad_recv_wc);
3207 return;
3208 }
3209
c4028958 3210 INIT_DELAYED_WORK(&work->work, cm_work_handler);
a977049d
HR		 3211 work->cm_event.event = event;
3212 work->mad_recv_wc = mad_recv_wc;
3213 work->port = (struct cm_port *)mad_agent->context;
c4028958 3214 queue_delayed_work(cm.wq, &work->work, 0);
a977049d
HR		 3215}
3216
3217static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3218 struct ib_qp_attr *qp_attr,
3219 int *qp_attr_mask)
3220{
3221 unsigned long flags;
3222 int ret;
3223
3224 spin_lock_irqsave(&cm_id_priv->lock, flags);
3225 switch (cm_id_priv->id.state) {
3226 case IB_CM_REQ_SENT:
3227 case IB_CM_MRA_REQ_RCVD:
3228 case IB_CM_REQ_RCVD:
3229 case IB_CM_MRA_REQ_SENT:
3230 case IB_CM_REP_RCVD:
3231 case IB_CM_MRA_REP_SENT:
3232 case IB_CM_REP_SENT:
3233 case IB_CM_MRA_REP_RCVD:
3234 case IB_CM_ESTABLISHED:
3235 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3236 IB_QP_PKEY_INDEX | IB_QP_PORT;
e31353ea 3237 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
a977049d 3238 if (cm_id_priv->responder_resources)
c1f250c0
SH		 3239 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3240 IB_ACCESS_REMOTE_ATOMIC;
a977049d
HR		 3241 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3242 qp_attr->port_num = cm_id_priv->av.port->port_num;
3243 ret = 0;
3244 break;
3245 default:
3246 ret = -EINVAL;
3247 break;
3248 }
3249 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3250 return ret;
3251}
3252
3253static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3254 struct ib_qp_attr *qp_attr,
3255 int *qp_attr_mask)
3256{
3257 unsigned long flags;
3258 int ret;
3259
3260 spin_lock_irqsave(&cm_id_priv->lock, flags);
3261 switch (cm_id_priv->id.state) {
3262 case IB_CM_REQ_RCVD:
3263 case IB_CM_MRA_REQ_SENT:
3264 case IB_CM_REP_RCVD:
3265 case IB_CM_MRA_REP_SENT:
3266 case IB_CM_REP_SENT:
3267 case IB_CM_MRA_REP_RCVD:
3268 case IB_CM_ESTABLISHED:
3269 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
ae7971a7 3270 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
a977049d
HR		 3271 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3272 qp_attr->path_mtu = cm_id_priv->path_mtu;
3273 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3274 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
ae7971a7
SH		 3275 if (cm_id_priv->qp_type == IB_QPT_RC) {
3276 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3277 IB_QP_MIN_RNR_TIMER;
3278 qp_attr->max_dest_rd_atomic =
3279 cm_id_priv->responder_resources;
3280 qp_attr->min_rnr_timer = 0;
3281 }
a977049d
HR		 3282 if (cm_id_priv->alt_av.ah_attr.dlid) {
3283 *qp_attr_mask |= IB_QP_ALT_PATH;
0d8fdfd7 3284 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
e1444b5a 3285 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
1d846126 3286 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
a977049d
HR		 3287 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3288 }
3289 ret = 0;
3290 break;
3291 default:
3292 ret = -EINVAL;
3293 break;
3294 }
3295 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3296 return ret;
3297}
3298
3299static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3300 struct ib_qp_attr *qp_attr,
3301 int *qp_attr_mask)
3302{
3303 unsigned long flags;
3304 int ret;
3305
3306 spin_lock_irqsave(&cm_id_priv->lock, flags);
3307 switch (cm_id_priv->id.state) {
0fe313b0
SH		 3308 /* Allow transition to RTS before sending REP */
3309 case IB_CM_REQ_RCVD:
3310 case IB_CM_MRA_REQ_SENT:
3311
a977049d
HR		 3312 case IB_CM_REP_RCVD:
3313 case IB_CM_MRA_REP_SENT:
3314 case IB_CM_REP_SENT:
3315 case IB_CM_MRA_REP_RCVD:
3316 case IB_CM_ESTABLISHED:
e1444b5a
SH		 3317 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
3318 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3319 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3320 if (cm_id_priv->qp_type == IB_QPT_RC) {
3321 *qp_attr_mask |= IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
3322 IB_QP_RNR_RETRY |
3323 IB_QP_MAX_QP_RD_ATOMIC;
1d846126 3324 qp_attr->timeout = cm_id_priv->av.timeout;
e1444b5a
SH		 3325 qp_attr->retry_cnt = cm_id_priv->retry_count;
3326 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3327 qp_attr->max_rd_atomic =
3328 cm_id_priv->initiator_depth;
3329 }
3330 if (cm_id_priv->alt_av.ah_attr.dlid) {
3331 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3332 qp_attr->path_mig_state = IB_MIG_REARM;
3333 }
3334 } else {
3335 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
3336 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3337 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
1d846126 3338 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
e1444b5a 3339 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
a977049d
HR		 3340 qp_attr->path_mig_state = IB_MIG_REARM;
3341 }
3342 ret = 0;
3343 break;
3344 default:
3345 ret = -EINVAL;
3346 break;
3347 }
3348 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3349 return ret;
3350}
3351
3352int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3353 struct ib_qp_attr *qp_attr,
3354 int *qp_attr_mask)
3355{
3356 struct cm_id_private *cm_id_priv;
3357 int ret;
3358
3359 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3360 switch (qp_attr->qp_state) {
3361 case IB_QPS_INIT:
3362 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3363 break;
3364 case IB_QPS_RTR:
3365 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3366 break;
3367 case IB_QPS_RTS:
3368 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3369 break;
3370 default:
3371 ret = -EINVAL;
3372 break;
3373 }
3374 return ret;
3375}
3376EXPORT_SYMBOL(ib_cm_init_qp_attr);
3377
1d846126
SH		 3378void cm_get_ack_delay(struct cm_device *cm_dev)
3379{
3380 struct ib_device_attr attr;
3381
3382 if (ib_query_device(cm_dev->device, &attr))
3383 cm_dev->ack_delay = 0; /* acks will rely on packet life time */
3384 else
3385 cm_dev->ack_delay = attr.local_ca_ack_delay;
3386}
3387
a977049d
HR		 3388static void cm_add_one(struct ib_device *device)
3389{
3390 struct cm_device *cm_dev;
3391 struct cm_port *port;
3392 struct ib_mad_reg_req reg_req = {
3393 .mgmt_class = IB_MGMT_CLASS_CM,
3394 .mgmt_class_version = IB_CM_CLASS_VERSION
3395 };
3396 struct ib_port_modify port_modify = {
3397 .set_port_cap_mask = IB_PORT_CM_SUP
3398 };
3399 unsigned long flags;
3400 int ret;
3401 u8 i;
3402
07ebafba
TT		 3403 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
3404 return;
3405
a977049d
HR		 3406 cm_dev = kmalloc(sizeof(*cm_dev) + sizeof(*port) *
3407 device->phys_port_cnt, GFP_KERNEL);
3408 if (!cm_dev)
3409 return;
3410
3411 cm_dev->device = device;
1d846126 3412 cm_get_ack_delay(cm_dev);
a977049d
HR		 3413
3414 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3415 for (i = 1; i <= device->phys_port_cnt; i++) {
3416 port = &cm_dev->port[i-1];
3417 port->cm_dev = cm_dev;
3418 port->port_num = i;
3419 port->mad_agent = ib_register_mad_agent(device, i,
3420 IB_QPT_GSI,
3421 &reg_req,
3422 0,
3423 cm_send_handler,
3424 cm_recv_handler,
3425 port);
3426 if (IS_ERR(port->mad_agent))
cf311cd4 3427 goto error1;
a977049d
HR		 3428
3429 ret = ib_modify_port(device, i, 0, &port_modify);
3430 if (ret)
cf311cd4 3431 goto error2;
a977049d
HR		 3432 }
3433 ib_set_client_data(device, &cm_client, cm_dev);
3434
3435 write_lock_irqsave(&cm.device_lock, flags);
3436 list_add_tail(&cm_dev->list, &cm.device_list);
3437 write_unlock_irqrestore(&cm.device_lock, flags);
3438 return;
3439
a977049d 3440error2:
cf311cd4
SH		 3441 ib_unregister_mad_agent(port->mad_agent);
3442error1:
a977049d
HR		 3443 port_modify.set_port_cap_mask = 0;
3444 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3445 while (--i) {
3446 port = &cm_dev->port[i-1];
3447 ib_modify_port(device, port->port_num, 0, &port_modify);
3448 ib_unregister_mad_agent(port->mad_agent);
3449 }
a977049d
HR		 3450 kfree(cm_dev);
3451}
3452
3453static void cm_remove_one(struct ib_device *device)
3454{
3455 struct cm_device *cm_dev;
3456 struct cm_port *port;
3457 struct ib_port_modify port_modify = {
3458 .clr_port_cap_mask = IB_PORT_CM_SUP
3459 };
3460 unsigned long flags;
3461 int i;
3462
3463 cm_dev = ib_get_client_data(device, &cm_client);
3464 if (!cm_dev)
3465 return;
3466
3467 write_lock_irqsave(&cm.device_lock, flags);
3468 list_del(&cm_dev->list);
3469 write_unlock_irqrestore(&cm.device_lock, flags);
3470
3471 for (i = 1; i <= device->phys_port_cnt; i++) {
3472 port = &cm_dev->port[i-1];
3473 ib_modify_port(device, port->port_num, 0, &port_modify);
3474 ib_unregister_mad_agent(port->mad_agent);
3475 }
3476 kfree(cm_dev);
3477}
3478
3479static int __init ib_cm_init(void)
3480{
3481 int ret;
3482
3483 memset(&cm, 0, sizeof cm);
3484 INIT_LIST_HEAD(&cm.device_list);
3485 rwlock_init(&cm.device_lock);
3486 spin_lock_init(&cm.lock);
3487 cm.listen_service_table = RB_ROOT;
3488 cm.listen_service_id = __constant_be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3489 cm.remote_id_table = RB_ROOT;
3490 cm.remote_qp_table = RB_ROOT;
3491 cm.remote_sidr_table = RB_ROOT;
3492 idr_init(&cm.local_id_table);
f06d2653 3493 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
a977049d 3494 idr_pre_get(&cm.local_id_table, GFP_KERNEL);
8575329d 3495 INIT_LIST_HEAD(&cm.timewait_list);
a977049d
HR		 3496
3497 cm.wq = create_workqueue("ib_cm");
3498 if (!cm.wq)
3499 return -ENOMEM;
3500
3501 ret = ib_register_client(&cm_client);
3502 if (ret)
3503 goto error;
3504
3505 return 0;
3506error:
3507 destroy_workqueue(cm.wq);
3508 return ret;
3509}
3510
3511static void __exit ib_cm_cleanup(void)
3512{
8575329d
SH		 3513 struct cm_timewait_info *timewait_info, *tmp;
3514
3515 spin_lock_irq(&cm.lock);
3516 list_for_each_entry(timewait_info, &cm.timewait_list, list)
3517 cancel_delayed_work(&timewait_info->work.work);
3518 spin_unlock_irq(&cm.lock);
3519
a977049d 3520 destroy_workqueue(cm.wq);
8575329d
SH		 3521
3522 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
3523 list_del(&timewait_info->list);
3524 kfree(timewait_info);
3525 }
3526
a977049d 3527 ib_unregister_client(&cm_client);
5d7edb3c 3528 idr_destroy(&cm.local_id_table);
a977049d
HR		 3529}
3530
3531module_init(ib_cm_init);
3532module_exit(ib_cm_cleanup);
3533
Linux kernel - Deliverables
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