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