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Merge branch 'osd-devel' into nfs-for-next
[mirror_ubuntu-artful-kernel.git] / drivers / infiniband / core / cm.c
1 /*
2 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved.
3 * Copyright (c) 2004 Topspin Corporation. All rights reserved.
4 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved.
5 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
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
36 #include <linux/completion.h>
37 #include <linux/dma-mapping.h>
38 #include <linux/device.h>
39 #include <linux/err.h>
40 #include <linux/idr.h>
41 #include <linux/interrupt.h>
42 #include <linux/random.h>
43 #include <linux/rbtree.h>
44 #include <linux/spinlock.h>
45 #include <linux/slab.h>
46 #include <linux/sysfs.h>
47 #include <linux/workqueue.h>
48 #include <linux/kdev_t.h>
49
50 #include <rdma/ib_cache.h>
51 #include <rdma/ib_cm.h>
52 #include "cm_msgs.h"
53
54 MODULE_AUTHOR("Sean Hefty");
55 MODULE_DESCRIPTION("InfiniBand CM");
56 MODULE_LICENSE("Dual BSD/GPL");
57
58 static void cm_add_one(struct ib_device *device);
59 static void cm_remove_one(struct ib_device *device);
60
61 static struct ib_client cm_client = {
62 .name = "cm",
63 .add = cm_add_one,
64 .remove = cm_remove_one
65 };
66
67 static struct ib_cm {
68 spinlock_t lock;
69 struct list_head device_list;
70 rwlock_t device_lock;
71 struct rb_root listen_service_table;
72 u64 listen_service_id;
73 /* struct rb_root peer_service_table; todo: fix peer to peer */
74 struct rb_root remote_qp_table;
75 struct rb_root remote_id_table;
76 struct rb_root remote_sidr_table;
77 struct idr local_id_table;
78 __be32 random_id_operand;
79 struct list_head timewait_list;
80 struct workqueue_struct *wq;
81 } cm;
82
83 /* Counter indexes ordered by attribute ID */
84 enum {
85 CM_REQ_COUNTER,
86 CM_MRA_COUNTER,
87 CM_REJ_COUNTER,
88 CM_REP_COUNTER,
89 CM_RTU_COUNTER,
90 CM_DREQ_COUNTER,
91 CM_DREP_COUNTER,
92 CM_SIDR_REQ_COUNTER,
93 CM_SIDR_REP_COUNTER,
94 CM_LAP_COUNTER,
95 CM_APR_COUNTER,
96 CM_ATTR_COUNT,
97 CM_ATTR_ID_OFFSET = 0x0010,
98 };
99
100 enum {
101 CM_XMIT,
102 CM_XMIT_RETRIES,
103 CM_RECV,
104 CM_RECV_DUPLICATES,
105 CM_COUNTER_GROUPS
106 };
107
108 static char const counter_group_names[CM_COUNTER_GROUPS]
109 [sizeof("cm_rx_duplicates")] = {
110 "cm_tx_msgs", "cm_tx_retries",
111 "cm_rx_msgs", "cm_rx_duplicates"
112 };
113
114 struct cm_counter_group {
115 struct kobject obj;
116 atomic_long_t counter[CM_ATTR_COUNT];
117 };
118
119 struct cm_counter_attribute {
120 struct attribute attr;
121 int index;
122 };
123
124 #define CM_COUNTER_ATTR(_name, _index) \
125 struct cm_counter_attribute cm_##_name##_counter_attr = { \
126 .attr = { .name = __stringify(_name), .mode = 0444 }, \
127 .index = _index \
128 }
129
130 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
131 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
132 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
133 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
134 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
135 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
136 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
137 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
138 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
139 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
140 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
141
142 static struct attribute *cm_counter_default_attrs[] = {
143 &cm_req_counter_attr.attr,
144 &cm_mra_counter_attr.attr,
145 &cm_rej_counter_attr.attr,
146 &cm_rep_counter_attr.attr,
147 &cm_rtu_counter_attr.attr,
148 &cm_dreq_counter_attr.attr,
149 &cm_drep_counter_attr.attr,
150 &cm_sidr_req_counter_attr.attr,
151 &cm_sidr_rep_counter_attr.attr,
152 &cm_lap_counter_attr.attr,
153 &cm_apr_counter_attr.attr,
154 NULL
155 };
156
157 struct cm_port {
158 struct cm_device *cm_dev;
159 struct ib_mad_agent *mad_agent;
160 struct kobject port_obj;
161 u8 port_num;
162 struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
163 };
164
165 struct cm_device {
166 struct list_head list;
167 struct ib_device *ib_device;
168 struct device *device;
169 u8 ack_delay;
170 struct cm_port *port[0];
171 };
172
173 struct cm_av {
174 struct cm_port *port;
175 union ib_gid dgid;
176 struct ib_ah_attr ah_attr;
177 u16 pkey_index;
178 u8 timeout;
179 };
180
181 struct cm_work {
182 struct delayed_work work;
183 struct list_head list;
184 struct cm_port *port;
185 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
186 __be32 local_id; /* Established / timewait */
187 __be32 remote_id;
188 struct ib_cm_event cm_event;
189 struct ib_sa_path_rec path[0];
190 };
191
192 struct cm_timewait_info {
193 struct cm_work work; /* Must be first. */
194 struct list_head list;
195 struct rb_node remote_qp_node;
196 struct rb_node remote_id_node;
197 __be64 remote_ca_guid;
198 __be32 remote_qpn;
199 u8 inserted_remote_qp;
200 u8 inserted_remote_id;
201 };
202
203 struct cm_id_private {
204 struct ib_cm_id id;
205
206 struct rb_node service_node;
207 struct rb_node sidr_id_node;
208 spinlock_t lock; /* Do not acquire inside cm.lock */
209 struct completion comp;
210 atomic_t refcount;
211
212 struct ib_mad_send_buf *msg;
213 struct cm_timewait_info *timewait_info;
214 /* todo: use alternate port on send failure */
215 struct cm_av av;
216 struct cm_av alt_av;
217 struct ib_cm_compare_data *compare_data;
218
219 void *private_data;
220 __be64 tid;
221 __be32 local_qpn;
222 __be32 remote_qpn;
223 enum ib_qp_type qp_type;
224 __be32 sq_psn;
225 __be32 rq_psn;
226 int timeout_ms;
227 enum ib_mtu path_mtu;
228 __be16 pkey;
229 u8 private_data_len;
230 u8 max_cm_retries;
231 u8 peer_to_peer;
232 u8 responder_resources;
233 u8 initiator_depth;
234 u8 retry_count;
235 u8 rnr_retry_count;
236 u8 service_timeout;
237 u8 target_ack_delay;
238
239 struct list_head work_list;
240 atomic_t work_count;
241 };
242
243 static void cm_work_handler(struct work_struct *work);
244
245 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
246 {
247 if (atomic_dec_and_test(&cm_id_priv->refcount))
248 complete(&cm_id_priv->comp);
249 }
250
251 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
252 struct ib_mad_send_buf **msg)
253 {
254 struct ib_mad_agent *mad_agent;
255 struct ib_mad_send_buf *m;
256 struct ib_ah *ah;
257
258 mad_agent = cm_id_priv->av.port->mad_agent;
259 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
260 if (IS_ERR(ah))
261 return PTR_ERR(ah);
262
263 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
264 cm_id_priv->av.pkey_index,
265 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
266 GFP_ATOMIC);
267 if (IS_ERR(m)) {
268 ib_destroy_ah(ah);
269 return PTR_ERR(m);
270 }
271
272 /* Timeout set by caller if response is expected. */
273 m->ah = ah;
274 m->retries = cm_id_priv->max_cm_retries;
275
276 atomic_inc(&cm_id_priv->refcount);
277 m->context[0] = cm_id_priv;
278 *msg = m;
279 return 0;
280 }
281
282 static int cm_alloc_response_msg(struct cm_port *port,
283 struct ib_mad_recv_wc *mad_recv_wc,
284 struct ib_mad_send_buf **msg)
285 {
286 struct ib_mad_send_buf *m;
287 struct ib_ah *ah;
288
289 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
290 mad_recv_wc->recv_buf.grh, port->port_num);
291 if (IS_ERR(ah))
292 return PTR_ERR(ah);
293
294 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
295 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
296 GFP_ATOMIC);
297 if (IS_ERR(m)) {
298 ib_destroy_ah(ah);
299 return PTR_ERR(m);
300 }
301 m->ah = ah;
302 *msg = m;
303 return 0;
304 }
305
306 static void cm_free_msg(struct ib_mad_send_buf *msg)
307 {
308 ib_destroy_ah(msg->ah);
309 if (msg->context[0])
310 cm_deref_id(msg->context[0]);
311 ib_free_send_mad(msg);
312 }
313
314 static void * cm_copy_private_data(const void *private_data,
315 u8 private_data_len)
316 {
317 void *data;
318
319 if (!private_data || !private_data_len)
320 return NULL;
321
322 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
323 if (!data)
324 return ERR_PTR(-ENOMEM);
325
326 return data;
327 }
328
329 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
330 void *private_data, u8 private_data_len)
331 {
332 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
333 kfree(cm_id_priv->private_data);
334
335 cm_id_priv->private_data = private_data;
336 cm_id_priv->private_data_len = private_data_len;
337 }
338
339 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
340 struct ib_grh *grh, struct cm_av *av)
341 {
342 av->port = port;
343 av->pkey_index = wc->pkey_index;
344 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc,
345 grh, &av->ah_attr);
346 }
347
348 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
349 {
350 struct cm_device *cm_dev;
351 struct cm_port *port = NULL;
352 unsigned long flags;
353 int ret;
354 u8 p;
355
356 read_lock_irqsave(&cm.device_lock, flags);
357 list_for_each_entry(cm_dev, &cm.device_list, list) {
358 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid,
359 &p, NULL)) {
360 port = cm_dev->port[p-1];
361 break;
362 }
363 }
364 read_unlock_irqrestore(&cm.device_lock, flags);
365
366 if (!port)
367 return -EINVAL;
368
369 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
370 be16_to_cpu(path->pkey), &av->pkey_index);
371 if (ret)
372 return ret;
373
374 av->port = port;
375 ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path,
376 &av->ah_attr);
377 av->timeout = path->packet_life_time + 1;
378 return 0;
379 }
380
381 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
382 {
383 unsigned long flags;
384 int ret, id;
385 static int next_id;
386
387 do {
388 spin_lock_irqsave(&cm.lock, flags);
389 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv,
390 next_id, &id);
391 if (!ret)
392 next_id = ((unsigned) id + 1) & MAX_ID_MASK;
393 spin_unlock_irqrestore(&cm.lock, flags);
394 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
395
396 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
397 return ret;
398 }
399
400 static void cm_free_id(__be32 local_id)
401 {
402 spin_lock_irq(&cm.lock);
403 idr_remove(&cm.local_id_table,
404 (__force int) (local_id ^ cm.random_id_operand));
405 spin_unlock_irq(&cm.lock);
406 }
407
408 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
409 {
410 struct cm_id_private *cm_id_priv;
411
412 cm_id_priv = idr_find(&cm.local_id_table,
413 (__force int) (local_id ^ cm.random_id_operand));
414 if (cm_id_priv) {
415 if (cm_id_priv->id.remote_id == remote_id)
416 atomic_inc(&cm_id_priv->refcount);
417 else
418 cm_id_priv = NULL;
419 }
420
421 return cm_id_priv;
422 }
423
424 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
425 {
426 struct cm_id_private *cm_id_priv;
427
428 spin_lock_irq(&cm.lock);
429 cm_id_priv = cm_get_id(local_id, remote_id);
430 spin_unlock_irq(&cm.lock);
431
432 return cm_id_priv;
433 }
434
435 static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
436 {
437 int i;
438
439 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
440 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
441 ((unsigned long *) mask)[i];
442 }
443
444 static int cm_compare_data(struct ib_cm_compare_data *src_data,
445 struct ib_cm_compare_data *dst_data)
446 {
447 u8 src[IB_CM_COMPARE_SIZE];
448 u8 dst[IB_CM_COMPARE_SIZE];
449
450 if (!src_data || !dst_data)
451 return 0;
452
453 cm_mask_copy(src, src_data->data, dst_data->mask);
454 cm_mask_copy(dst, dst_data->data, src_data->mask);
455 return memcmp(src, dst, IB_CM_COMPARE_SIZE);
456 }
457
458 static int cm_compare_private_data(u8 *private_data,
459 struct ib_cm_compare_data *dst_data)
460 {
461 u8 src[IB_CM_COMPARE_SIZE];
462
463 if (!dst_data)
464 return 0;
465
466 cm_mask_copy(src, private_data, dst_data->mask);
467 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
468 }
469
470 /*
471 * Trivial helpers to strip endian annotation and compare; the
472 * endianness doesn't actually matter since we just need a stable
473 * order for the RB tree.
474 */
475 static int be32_lt(__be32 a, __be32 b)
476 {
477 return (__force u32) a < (__force u32) b;
478 }
479
480 static int be32_gt(__be32 a, __be32 b)
481 {
482 return (__force u32) a > (__force u32) b;
483 }
484
485 static int be64_lt(__be64 a, __be64 b)
486 {
487 return (__force u64) a < (__force u64) b;
488 }
489
490 static int be64_gt(__be64 a, __be64 b)
491 {
492 return (__force u64) a > (__force u64) b;
493 }
494
495 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
496 {
497 struct rb_node **link = &cm.listen_service_table.rb_node;
498 struct rb_node *parent = NULL;
499 struct cm_id_private *cur_cm_id_priv;
500 __be64 service_id = cm_id_priv->id.service_id;
501 __be64 service_mask = cm_id_priv->id.service_mask;
502 int data_cmp;
503
504 while (*link) {
505 parent = *link;
506 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
507 service_node);
508 data_cmp = cm_compare_data(cm_id_priv->compare_data,
509 cur_cm_id_priv->compare_data);
510 if ((cur_cm_id_priv->id.service_mask & service_id) ==
511 (service_mask & cur_cm_id_priv->id.service_id) &&
512 (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
513 !data_cmp)
514 return cur_cm_id_priv;
515
516 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
517 link = &(*link)->rb_left;
518 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
519 link = &(*link)->rb_right;
520 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
521 link = &(*link)->rb_left;
522 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
523 link = &(*link)->rb_right;
524 else if (data_cmp < 0)
525 link = &(*link)->rb_left;
526 else
527 link = &(*link)->rb_right;
528 }
529 rb_link_node(&cm_id_priv->service_node, parent, link);
530 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
531 return NULL;
532 }
533
534 static struct cm_id_private * cm_find_listen(struct ib_device *device,
535 __be64 service_id,
536 u8 *private_data)
537 {
538 struct rb_node *node = cm.listen_service_table.rb_node;
539 struct cm_id_private *cm_id_priv;
540 int data_cmp;
541
542 while (node) {
543 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
544 data_cmp = cm_compare_private_data(private_data,
545 cm_id_priv->compare_data);
546 if ((cm_id_priv->id.service_mask & service_id) ==
547 cm_id_priv->id.service_id &&
548 (cm_id_priv->id.device == device) && !data_cmp)
549 return cm_id_priv;
550
551 if (device < cm_id_priv->id.device)
552 node = node->rb_left;
553 else if (device > cm_id_priv->id.device)
554 node = node->rb_right;
555 else if (be64_lt(service_id, cm_id_priv->id.service_id))
556 node = node->rb_left;
557 else if (be64_gt(service_id, cm_id_priv->id.service_id))
558 node = node->rb_right;
559 else if (data_cmp < 0)
560 node = node->rb_left;
561 else
562 node = node->rb_right;
563 }
564 return NULL;
565 }
566
567 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
568 *timewait_info)
569 {
570 struct rb_node **link = &cm.remote_id_table.rb_node;
571 struct rb_node *parent = NULL;
572 struct cm_timewait_info *cur_timewait_info;
573 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
574 __be32 remote_id = timewait_info->work.remote_id;
575
576 while (*link) {
577 parent = *link;
578 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
579 remote_id_node);
580 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
581 link = &(*link)->rb_left;
582 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
583 link = &(*link)->rb_right;
584 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
585 link = &(*link)->rb_left;
586 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
587 link = &(*link)->rb_right;
588 else
589 return cur_timewait_info;
590 }
591 timewait_info->inserted_remote_id = 1;
592 rb_link_node(&timewait_info->remote_id_node, parent, link);
593 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
594 return NULL;
595 }
596
597 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
598 __be32 remote_id)
599 {
600 struct rb_node *node = cm.remote_id_table.rb_node;
601 struct cm_timewait_info *timewait_info;
602
603 while (node) {
604 timewait_info = rb_entry(node, struct cm_timewait_info,
605 remote_id_node);
606 if (be32_lt(remote_id, timewait_info->work.remote_id))
607 node = node->rb_left;
608 else if (be32_gt(remote_id, timewait_info->work.remote_id))
609 node = node->rb_right;
610 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
611 node = node->rb_left;
612 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
613 node = node->rb_right;
614 else
615 return timewait_info;
616 }
617 return NULL;
618 }
619
620 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
621 *timewait_info)
622 {
623 struct rb_node **link = &cm.remote_qp_table.rb_node;
624 struct rb_node *parent = NULL;
625 struct cm_timewait_info *cur_timewait_info;
626 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
627 __be32 remote_qpn = timewait_info->remote_qpn;
628
629 while (*link) {
630 parent = *link;
631 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
632 remote_qp_node);
633 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
634 link = &(*link)->rb_left;
635 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
636 link = &(*link)->rb_right;
637 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
638 link = &(*link)->rb_left;
639 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
640 link = &(*link)->rb_right;
641 else
642 return cur_timewait_info;
643 }
644 timewait_info->inserted_remote_qp = 1;
645 rb_link_node(&timewait_info->remote_qp_node, parent, link);
646 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
647 return NULL;
648 }
649
650 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
651 *cm_id_priv)
652 {
653 struct rb_node **link = &cm.remote_sidr_table.rb_node;
654 struct rb_node *parent = NULL;
655 struct cm_id_private *cur_cm_id_priv;
656 union ib_gid *port_gid = &cm_id_priv->av.dgid;
657 __be32 remote_id = cm_id_priv->id.remote_id;
658
659 while (*link) {
660 parent = *link;
661 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
662 sidr_id_node);
663 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
664 link = &(*link)->rb_left;
665 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
666 link = &(*link)->rb_right;
667 else {
668 int cmp;
669 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
670 sizeof *port_gid);
671 if (cmp < 0)
672 link = &(*link)->rb_left;
673 else if (cmp > 0)
674 link = &(*link)->rb_right;
675 else
676 return cur_cm_id_priv;
677 }
678 }
679 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
680 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
681 return NULL;
682 }
683
684 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
685 enum ib_cm_sidr_status status)
686 {
687 struct ib_cm_sidr_rep_param param;
688
689 memset(&param, 0, sizeof param);
690 param.status = status;
691 ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
692 }
693
694 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
695 ib_cm_handler cm_handler,
696 void *context)
697 {
698 struct cm_id_private *cm_id_priv;
699 int ret;
700
701 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
702 if (!cm_id_priv)
703 return ERR_PTR(-ENOMEM);
704
705 cm_id_priv->id.state = IB_CM_IDLE;
706 cm_id_priv->id.device = device;
707 cm_id_priv->id.cm_handler = cm_handler;
708 cm_id_priv->id.context = context;
709 cm_id_priv->id.remote_cm_qpn = 1;
710 ret = cm_alloc_id(cm_id_priv);
711 if (ret)
712 goto error;
713
714 spin_lock_init(&cm_id_priv->lock);
715 init_completion(&cm_id_priv->comp);
716 INIT_LIST_HEAD(&cm_id_priv->work_list);
717 atomic_set(&cm_id_priv->work_count, -1);
718 atomic_set(&cm_id_priv->refcount, 1);
719 return &cm_id_priv->id;
720
721 error:
722 kfree(cm_id_priv);
723 return ERR_PTR(-ENOMEM);
724 }
725 EXPORT_SYMBOL(ib_create_cm_id);
726
727 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
728 {
729 struct cm_work *work;
730
731 if (list_empty(&cm_id_priv->work_list))
732 return NULL;
733
734 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
735 list_del(&work->list);
736 return work;
737 }
738
739 static void cm_free_work(struct cm_work *work)
740 {
741 if (work->mad_recv_wc)
742 ib_free_recv_mad(work->mad_recv_wc);
743 kfree(work);
744 }
745
746 static inline int cm_convert_to_ms(int iba_time)
747 {
748 /* approximate conversion to ms from 4.096us x 2^iba_time */
749 return 1 << max(iba_time - 8, 0);
750 }
751
752 /*
753 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
754 * Because of how ack_timeout is stored, adding one doubles the timeout.
755 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
756 * increment it (round up) only if the other is within 50%.
757 */
758 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
759 {
760 int ack_timeout = packet_life_time + 1;
761
762 if (ack_timeout >= ca_ack_delay)
763 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
764 else
765 ack_timeout = ca_ack_delay +
766 (ack_timeout >= (ca_ack_delay - 1));
767
768 return min(31, ack_timeout);
769 }
770
771 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
772 {
773 if (timewait_info->inserted_remote_id) {
774 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
775 timewait_info->inserted_remote_id = 0;
776 }
777
778 if (timewait_info->inserted_remote_qp) {
779 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
780 timewait_info->inserted_remote_qp = 0;
781 }
782 }
783
784 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
785 {
786 struct cm_timewait_info *timewait_info;
787
788 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
789 if (!timewait_info)
790 return ERR_PTR(-ENOMEM);
791
792 timewait_info->work.local_id = local_id;
793 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
794 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
795 return timewait_info;
796 }
797
798 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
799 {
800 int wait_time;
801 unsigned long flags;
802
803 spin_lock_irqsave(&cm.lock, flags);
804 cm_cleanup_timewait(cm_id_priv->timewait_info);
805 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
806 spin_unlock_irqrestore(&cm.lock, flags);
807
808 /*
809 * The cm_id could be destroyed by the user before we exit timewait.
810 * To protect against this, we search for the cm_id after exiting
811 * timewait before notifying the user that we've exited timewait.
812 */
813 cm_id_priv->id.state = IB_CM_TIMEWAIT;
814 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
815 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
816 msecs_to_jiffies(wait_time));
817 cm_id_priv->timewait_info = NULL;
818 }
819
820 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
821 {
822 unsigned long flags;
823
824 cm_id_priv->id.state = IB_CM_IDLE;
825 if (cm_id_priv->timewait_info) {
826 spin_lock_irqsave(&cm.lock, flags);
827 cm_cleanup_timewait(cm_id_priv->timewait_info);
828 spin_unlock_irqrestore(&cm.lock, flags);
829 kfree(cm_id_priv->timewait_info);
830 cm_id_priv->timewait_info = NULL;
831 }
832 }
833
834 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
835 {
836 struct cm_id_private *cm_id_priv;
837 struct cm_work *work;
838
839 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
840 retest:
841 spin_lock_irq(&cm_id_priv->lock);
842 switch (cm_id->state) {
843 case IB_CM_LISTEN:
844 cm_id->state = IB_CM_IDLE;
845 spin_unlock_irq(&cm_id_priv->lock);
846 spin_lock_irq(&cm.lock);
847 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
848 spin_unlock_irq(&cm.lock);
849 break;
850 case IB_CM_SIDR_REQ_SENT:
851 cm_id->state = IB_CM_IDLE;
852 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
853 spin_unlock_irq(&cm_id_priv->lock);
854 break;
855 case IB_CM_SIDR_REQ_RCVD:
856 spin_unlock_irq(&cm_id_priv->lock);
857 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
858 break;
859 case IB_CM_REQ_SENT:
860 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
861 spin_unlock_irq(&cm_id_priv->lock);
862 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
863 &cm_id_priv->id.device->node_guid,
864 sizeof cm_id_priv->id.device->node_guid,
865 NULL, 0);
866 break;
867 case IB_CM_REQ_RCVD:
868 if (err == -ENOMEM) {
869 /* Do not reject to allow future retries. */
870 cm_reset_to_idle(cm_id_priv);
871 spin_unlock_irq(&cm_id_priv->lock);
872 } else {
873 spin_unlock_irq(&cm_id_priv->lock);
874 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
875 NULL, 0, NULL, 0);
876 }
877 break;
878 case IB_CM_MRA_REQ_RCVD:
879 case IB_CM_REP_SENT:
880 case IB_CM_MRA_REP_RCVD:
881 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
882 /* Fall through */
883 case IB_CM_MRA_REQ_SENT:
884 case IB_CM_REP_RCVD:
885 case IB_CM_MRA_REP_SENT:
886 spin_unlock_irq(&cm_id_priv->lock);
887 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
888 NULL, 0, NULL, 0);
889 break;
890 case IB_CM_ESTABLISHED:
891 spin_unlock_irq(&cm_id_priv->lock);
892 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT)
893 break;
894 ib_send_cm_dreq(cm_id, NULL, 0);
895 goto retest;
896 case IB_CM_DREQ_SENT:
897 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
898 cm_enter_timewait(cm_id_priv);
899 spin_unlock_irq(&cm_id_priv->lock);
900 break;
901 case IB_CM_DREQ_RCVD:
902 spin_unlock_irq(&cm_id_priv->lock);
903 ib_send_cm_drep(cm_id, NULL, 0);
904 break;
905 default:
906 spin_unlock_irq(&cm_id_priv->lock);
907 break;
908 }
909
910 cm_free_id(cm_id->local_id);
911 cm_deref_id(cm_id_priv);
912 wait_for_completion(&cm_id_priv->comp);
913 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
914 cm_free_work(work);
915 kfree(cm_id_priv->compare_data);
916 kfree(cm_id_priv->private_data);
917 kfree(cm_id_priv);
918 }
919
920 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
921 {
922 cm_destroy_id(cm_id, 0);
923 }
924 EXPORT_SYMBOL(ib_destroy_cm_id);
925
926 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
927 struct ib_cm_compare_data *compare_data)
928 {
929 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
930 unsigned long flags;
931 int ret = 0;
932
933 service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
934 service_id &= service_mask;
935 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
936 (service_id != IB_CM_ASSIGN_SERVICE_ID))
937 return -EINVAL;
938
939 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
940 if (cm_id->state != IB_CM_IDLE)
941 return -EINVAL;
942
943 if (compare_data) {
944 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
945 GFP_KERNEL);
946 if (!cm_id_priv->compare_data)
947 return -ENOMEM;
948 cm_mask_copy(cm_id_priv->compare_data->data,
949 compare_data->data, compare_data->mask);
950 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
951 IB_CM_COMPARE_SIZE);
952 }
953
954 cm_id->state = IB_CM_LISTEN;
955
956 spin_lock_irqsave(&cm.lock, flags);
957 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
958 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
959 cm_id->service_mask = ~cpu_to_be64(0);
960 } else {
961 cm_id->service_id = service_id;
962 cm_id->service_mask = service_mask;
963 }
964 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
965 spin_unlock_irqrestore(&cm.lock, flags);
966
967 if (cur_cm_id_priv) {
968 cm_id->state = IB_CM_IDLE;
969 kfree(cm_id_priv->compare_data);
970 cm_id_priv->compare_data = NULL;
971 ret = -EBUSY;
972 }
973 return ret;
974 }
975 EXPORT_SYMBOL(ib_cm_listen);
976
977 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
978 enum cm_msg_sequence msg_seq)
979 {
980 u64 hi_tid, low_tid;
981
982 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
983 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
984 (msg_seq << 30));
985 return cpu_to_be64(hi_tid | low_tid);
986 }
987
988 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
989 __be16 attr_id, __be64 tid)
990 {
991 hdr->base_version = IB_MGMT_BASE_VERSION;
992 hdr->mgmt_class = IB_MGMT_CLASS_CM;
993 hdr->class_version = IB_CM_CLASS_VERSION;
994 hdr->method = IB_MGMT_METHOD_SEND;
995 hdr->attr_id = attr_id;
996 hdr->tid = tid;
997 }
998
999 static void cm_format_req(struct cm_req_msg *req_msg,
1000 struct cm_id_private *cm_id_priv,
1001 struct ib_cm_req_param *param)
1002 {
1003 struct ib_sa_path_rec *pri_path = param->primary_path;
1004 struct ib_sa_path_rec *alt_path = param->alternate_path;
1005
1006 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1007 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
1008
1009 req_msg->local_comm_id = cm_id_priv->id.local_id;
1010 req_msg->service_id = param->service_id;
1011 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1012 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
1013 cm_req_set_init_depth(req_msg, param->initiator_depth);
1014 cm_req_set_remote_resp_timeout(req_msg,
1015 param->remote_cm_response_timeout);
1016 cm_req_set_qp_type(req_msg, param->qp_type);
1017 cm_req_set_flow_ctrl(req_msg, param->flow_control);
1018 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
1019 cm_req_set_local_resp_timeout(req_msg,
1020 param->local_cm_response_timeout);
1021 req_msg->pkey = param->primary_path->pkey;
1022 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
1023 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
1024
1025 if (param->qp_type != IB_QPT_XRC_INI) {
1026 cm_req_set_resp_res(req_msg, param->responder_resources);
1027 cm_req_set_retry_count(req_msg, param->retry_count);
1028 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
1029 cm_req_set_srq(req_msg, param->srq);
1030 }
1031
1032 if (pri_path->hop_limit <= 1) {
1033 req_msg->primary_local_lid = pri_path->slid;
1034 req_msg->primary_remote_lid = pri_path->dlid;
1035 } else {
1036 /* Work-around until there's a way to obtain remote LID info */
1037 req_msg->primary_local_lid = IB_LID_PERMISSIVE;
1038 req_msg->primary_remote_lid = IB_LID_PERMISSIVE;
1039 }
1040 req_msg->primary_local_gid = pri_path->sgid;
1041 req_msg->primary_remote_gid = pri_path->dgid;
1042 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label);
1043 cm_req_set_primary_packet_rate(req_msg, pri_path->rate);
1044 req_msg->primary_traffic_class = pri_path->traffic_class;
1045 req_msg->primary_hop_limit = pri_path->hop_limit;
1046 cm_req_set_primary_sl(req_msg, pri_path->sl);
1047 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1));
1048 cm_req_set_primary_local_ack_timeout(req_msg,
1049 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1050 pri_path->packet_life_time));
1051
1052 if (alt_path) {
1053 if (alt_path->hop_limit <= 1) {
1054 req_msg->alt_local_lid = alt_path->slid;
1055 req_msg->alt_remote_lid = alt_path->dlid;
1056 } else {
1057 req_msg->alt_local_lid = IB_LID_PERMISSIVE;
1058 req_msg->alt_remote_lid = IB_LID_PERMISSIVE;
1059 }
1060 req_msg->alt_local_gid = alt_path->sgid;
1061 req_msg->alt_remote_gid = alt_path->dgid;
1062 cm_req_set_alt_flow_label(req_msg,
1063 alt_path->flow_label);
1064 cm_req_set_alt_packet_rate(req_msg, alt_path->rate);
1065 req_msg->alt_traffic_class = alt_path->traffic_class;
1066 req_msg->alt_hop_limit = alt_path->hop_limit;
1067 cm_req_set_alt_sl(req_msg, alt_path->sl);
1068 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1));
1069 cm_req_set_alt_local_ack_timeout(req_msg,
1070 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1071 alt_path->packet_life_time));
1072 }
1073
1074 if (param->private_data && param->private_data_len)
1075 memcpy(req_msg->private_data, param->private_data,
1076 param->private_data_len);
1077 }
1078
1079 static int cm_validate_req_param(struct ib_cm_req_param *param)
1080 {
1081 /* peer-to-peer not supported */
1082 if (param->peer_to_peer)
1083 return -EINVAL;
1084
1085 if (!param->primary_path)
1086 return -EINVAL;
1087
1088 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1089 param->qp_type != IB_QPT_XRC_INI)
1090 return -EINVAL;
1091
1092 if (param->private_data &&
1093 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1094 return -EINVAL;
1095
1096 if (param->alternate_path &&
1097 (param->alternate_path->pkey != param->primary_path->pkey ||
1098 param->alternate_path->mtu != param->primary_path->mtu))
1099 return -EINVAL;
1100
1101 return 0;
1102 }
1103
1104 int ib_send_cm_req(struct ib_cm_id *cm_id,
1105 struct ib_cm_req_param *param)
1106 {
1107 struct cm_id_private *cm_id_priv;
1108 struct cm_req_msg *req_msg;
1109 unsigned long flags;
1110 int ret;
1111
1112 ret = cm_validate_req_param(param);
1113 if (ret)
1114 return ret;
1115
1116 /* Verify that we're not in timewait. */
1117 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1118 spin_lock_irqsave(&cm_id_priv->lock, flags);
1119 if (cm_id->state != IB_CM_IDLE) {
1120 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1121 ret = -EINVAL;
1122 goto out;
1123 }
1124 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1125
1126 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1127 id.local_id);
1128 if (IS_ERR(cm_id_priv->timewait_info)) {
1129 ret = PTR_ERR(cm_id_priv->timewait_info);
1130 goto out;
1131 }
1132
1133 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
1134 if (ret)
1135 goto error1;
1136 if (param->alternate_path) {
1137 ret = cm_init_av_by_path(param->alternate_path,
1138 &cm_id_priv->alt_av);
1139 if (ret)
1140 goto error1;
1141 }
1142 cm_id->service_id = param->service_id;
1143 cm_id->service_mask = ~cpu_to_be64(0);
1144 cm_id_priv->timeout_ms = cm_convert_to_ms(
1145 param->primary_path->packet_life_time) * 2 +
1146 cm_convert_to_ms(
1147 param->remote_cm_response_timeout);
1148 cm_id_priv->max_cm_retries = param->max_cm_retries;
1149 cm_id_priv->initiator_depth = param->initiator_depth;
1150 cm_id_priv->responder_resources = param->responder_resources;
1151 cm_id_priv->retry_count = param->retry_count;
1152 cm_id_priv->path_mtu = param->primary_path->mtu;
1153 cm_id_priv->pkey = param->primary_path->pkey;
1154 cm_id_priv->qp_type = param->qp_type;
1155
1156 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1157 if (ret)
1158 goto error1;
1159
1160 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1161 cm_format_req(req_msg, cm_id_priv, param);
1162 cm_id_priv->tid = req_msg->hdr.tid;
1163 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1164 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1165
1166 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1167 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1168
1169 spin_lock_irqsave(&cm_id_priv->lock, flags);
1170 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1171 if (ret) {
1172 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1173 goto error2;
1174 }
1175 BUG_ON(cm_id->state != IB_CM_IDLE);
1176 cm_id->state = IB_CM_REQ_SENT;
1177 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1178 return 0;
1179
1180 error2: cm_free_msg(cm_id_priv->msg);
1181 error1: kfree(cm_id_priv->timewait_info);
1182 out: return ret;
1183 }
1184 EXPORT_SYMBOL(ib_send_cm_req);
1185
1186 static int cm_issue_rej(struct cm_port *port,
1187 struct ib_mad_recv_wc *mad_recv_wc,
1188 enum ib_cm_rej_reason reason,
1189 enum cm_msg_response msg_rejected,
1190 void *ari, u8 ari_length)
1191 {
1192 struct ib_mad_send_buf *msg = NULL;
1193 struct cm_rej_msg *rej_msg, *rcv_msg;
1194 int ret;
1195
1196 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1197 if (ret)
1198 return ret;
1199
1200 /* We just need common CM header information. Cast to any message. */
1201 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1202 rej_msg = (struct cm_rej_msg *) msg->mad;
1203
1204 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1205 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1206 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1207 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1208 rej_msg->reason = cpu_to_be16(reason);
1209
1210 if (ari && ari_length) {
1211 cm_rej_set_reject_info_len(rej_msg, ari_length);
1212 memcpy(rej_msg->ari, ari, ari_length);
1213 }
1214
1215 ret = ib_post_send_mad(msg, NULL);
1216 if (ret)
1217 cm_free_msg(msg);
1218
1219 return ret;
1220 }
1221
1222 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1223 __be32 local_qpn, __be32 remote_qpn)
1224 {
1225 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1226 ((local_ca_guid == remote_ca_guid) &&
1227 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1228 }
1229
1230 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1231 struct ib_sa_path_rec *primary_path,
1232 struct ib_sa_path_rec *alt_path)
1233 {
1234 memset(primary_path, 0, sizeof *primary_path);
1235 primary_path->dgid = req_msg->primary_local_gid;
1236 primary_path->sgid = req_msg->primary_remote_gid;
1237 primary_path->dlid = req_msg->primary_local_lid;
1238 primary_path->slid = req_msg->primary_remote_lid;
1239 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1240 primary_path->hop_limit = req_msg->primary_hop_limit;
1241 primary_path->traffic_class = req_msg->primary_traffic_class;
1242 primary_path->reversible = 1;
1243 primary_path->pkey = req_msg->pkey;
1244 primary_path->sl = cm_req_get_primary_sl(req_msg);
1245 primary_path->mtu_selector = IB_SA_EQ;
1246 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1247 primary_path->rate_selector = IB_SA_EQ;
1248 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1249 primary_path->packet_life_time_selector = IB_SA_EQ;
1250 primary_path->packet_life_time =
1251 cm_req_get_primary_local_ack_timeout(req_msg);
1252 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1253
1254 if (req_msg->alt_local_lid) {
1255 memset(alt_path, 0, sizeof *alt_path);
1256 alt_path->dgid = req_msg->alt_local_gid;
1257 alt_path->sgid = req_msg->alt_remote_gid;
1258 alt_path->dlid = req_msg->alt_local_lid;
1259 alt_path->slid = req_msg->alt_remote_lid;
1260 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1261 alt_path->hop_limit = req_msg->alt_hop_limit;
1262 alt_path->traffic_class = req_msg->alt_traffic_class;
1263 alt_path->reversible = 1;
1264 alt_path->pkey = req_msg->pkey;
1265 alt_path->sl = cm_req_get_alt_sl(req_msg);
1266 alt_path->mtu_selector = IB_SA_EQ;
1267 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1268 alt_path->rate_selector = IB_SA_EQ;
1269 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1270 alt_path->packet_life_time_selector = IB_SA_EQ;
1271 alt_path->packet_life_time =
1272 cm_req_get_alt_local_ack_timeout(req_msg);
1273 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1274 }
1275 }
1276
1277 static void cm_format_req_event(struct cm_work *work,
1278 struct cm_id_private *cm_id_priv,
1279 struct ib_cm_id *listen_id)
1280 {
1281 struct cm_req_msg *req_msg;
1282 struct ib_cm_req_event_param *param;
1283
1284 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1285 param = &work->cm_event.param.req_rcvd;
1286 param->listen_id = listen_id;
1287 param->port = cm_id_priv->av.port->port_num;
1288 param->primary_path = &work->path[0];
1289 if (req_msg->alt_local_lid)
1290 param->alternate_path = &work->path[1];
1291 else
1292 param->alternate_path = NULL;
1293 param->remote_ca_guid = req_msg->local_ca_guid;
1294 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1295 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1296 param->qp_type = cm_req_get_qp_type(req_msg);
1297 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1298 param->responder_resources = cm_req_get_init_depth(req_msg);
1299 param->initiator_depth = cm_req_get_resp_res(req_msg);
1300 param->local_cm_response_timeout =
1301 cm_req_get_remote_resp_timeout(req_msg);
1302 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1303 param->remote_cm_response_timeout =
1304 cm_req_get_local_resp_timeout(req_msg);
1305 param->retry_count = cm_req_get_retry_count(req_msg);
1306 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1307 param->srq = cm_req_get_srq(req_msg);
1308 work->cm_event.private_data = &req_msg->private_data;
1309 }
1310
1311 static void cm_process_work(struct cm_id_private *cm_id_priv,
1312 struct cm_work *work)
1313 {
1314 int ret;
1315
1316 /* We will typically only have the current event to report. */
1317 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1318 cm_free_work(work);
1319
1320 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1321 spin_lock_irq(&cm_id_priv->lock);
1322 work = cm_dequeue_work(cm_id_priv);
1323 spin_unlock_irq(&cm_id_priv->lock);
1324 BUG_ON(!work);
1325 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1326 &work->cm_event);
1327 cm_free_work(work);
1328 }
1329 cm_deref_id(cm_id_priv);
1330 if (ret)
1331 cm_destroy_id(&cm_id_priv->id, ret);
1332 }
1333
1334 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1335 struct cm_id_private *cm_id_priv,
1336 enum cm_msg_response msg_mraed, u8 service_timeout,
1337 const void *private_data, u8 private_data_len)
1338 {
1339 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1340 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1341 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1342 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1343 cm_mra_set_service_timeout(mra_msg, service_timeout);
1344
1345 if (private_data && private_data_len)
1346 memcpy(mra_msg->private_data, private_data, private_data_len);
1347 }
1348
1349 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1350 struct cm_id_private *cm_id_priv,
1351 enum ib_cm_rej_reason reason,
1352 void *ari,
1353 u8 ari_length,
1354 const void *private_data,
1355 u8 private_data_len)
1356 {
1357 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1358 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1359
1360 switch(cm_id_priv->id.state) {
1361 case IB_CM_REQ_RCVD:
1362 rej_msg->local_comm_id = 0;
1363 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1364 break;
1365 case IB_CM_MRA_REQ_SENT:
1366 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1367 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1368 break;
1369 case IB_CM_REP_RCVD:
1370 case IB_CM_MRA_REP_SENT:
1371 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1372 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1373 break;
1374 default:
1375 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1376 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1377 break;
1378 }
1379
1380 rej_msg->reason = cpu_to_be16(reason);
1381 if (ari && ari_length) {
1382 cm_rej_set_reject_info_len(rej_msg, ari_length);
1383 memcpy(rej_msg->ari, ari, ari_length);
1384 }
1385
1386 if (private_data && private_data_len)
1387 memcpy(rej_msg->private_data, private_data, private_data_len);
1388 }
1389
1390 static void cm_dup_req_handler(struct cm_work *work,
1391 struct cm_id_private *cm_id_priv)
1392 {
1393 struct ib_mad_send_buf *msg = NULL;
1394 int ret;
1395
1396 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1397 counter[CM_REQ_COUNTER]);
1398
1399 /* Quick state check to discard duplicate REQs. */
1400 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1401 return;
1402
1403 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1404 if (ret)
1405 return;
1406
1407 spin_lock_irq(&cm_id_priv->lock);
1408 switch (cm_id_priv->id.state) {
1409 case IB_CM_MRA_REQ_SENT:
1410 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1411 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1412 cm_id_priv->private_data,
1413 cm_id_priv->private_data_len);
1414 break;
1415 case IB_CM_TIMEWAIT:
1416 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1417 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1418 break;
1419 default:
1420 goto unlock;
1421 }
1422 spin_unlock_irq(&cm_id_priv->lock);
1423
1424 ret = ib_post_send_mad(msg, NULL);
1425 if (ret)
1426 goto free;
1427 return;
1428
1429 unlock: spin_unlock_irq(&cm_id_priv->lock);
1430 free: cm_free_msg(msg);
1431 }
1432
1433 static struct cm_id_private * cm_match_req(struct cm_work *work,
1434 struct cm_id_private *cm_id_priv)
1435 {
1436 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1437 struct cm_timewait_info *timewait_info;
1438 struct cm_req_msg *req_msg;
1439
1440 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1441
1442 /* Check for possible duplicate REQ. */
1443 spin_lock_irq(&cm.lock);
1444 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1445 if (timewait_info) {
1446 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1447 timewait_info->work.remote_id);
1448 spin_unlock_irq(&cm.lock);
1449 if (cur_cm_id_priv) {
1450 cm_dup_req_handler(work, cur_cm_id_priv);
1451 cm_deref_id(cur_cm_id_priv);
1452 }
1453 return NULL;
1454 }
1455
1456 /* Check for stale connections. */
1457 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1458 if (timewait_info) {
1459 cm_cleanup_timewait(cm_id_priv->timewait_info);
1460 spin_unlock_irq(&cm.lock);
1461 cm_issue_rej(work->port, work->mad_recv_wc,
1462 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1463 NULL, 0);
1464 return NULL;
1465 }
1466
1467 /* Find matching listen request. */
1468 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1469 req_msg->service_id,
1470 req_msg->private_data);
1471 if (!listen_cm_id_priv) {
1472 cm_cleanup_timewait(cm_id_priv->timewait_info);
1473 spin_unlock_irq(&cm.lock);
1474 cm_issue_rej(work->port, work->mad_recv_wc,
1475 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1476 NULL, 0);
1477 goto out;
1478 }
1479 atomic_inc(&listen_cm_id_priv->refcount);
1480 atomic_inc(&cm_id_priv->refcount);
1481 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1482 atomic_inc(&cm_id_priv->work_count);
1483 spin_unlock_irq(&cm.lock);
1484 out:
1485 return listen_cm_id_priv;
1486 }
1487
1488 /*
1489 * Work-around for inter-subnet connections. If the LIDs are permissive,
1490 * we need to override the LID/SL data in the REQ with the LID information
1491 * in the work completion.
1492 */
1493 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
1494 {
1495 if (!cm_req_get_primary_subnet_local(req_msg)) {
1496 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) {
1497 req_msg->primary_local_lid = cpu_to_be16(wc->slid);
1498 cm_req_set_primary_sl(req_msg, wc->sl);
1499 }
1500
1501 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE)
1502 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1503 }
1504
1505 if (!cm_req_get_alt_subnet_local(req_msg)) {
1506 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) {
1507 req_msg->alt_local_lid = cpu_to_be16(wc->slid);
1508 cm_req_set_alt_sl(req_msg, wc->sl);
1509 }
1510
1511 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE)
1512 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1513 }
1514 }
1515
1516 static int cm_req_handler(struct cm_work *work)
1517 {
1518 struct ib_cm_id *cm_id;
1519 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1520 struct cm_req_msg *req_msg;
1521 int ret;
1522
1523 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1524
1525 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
1526 if (IS_ERR(cm_id))
1527 return PTR_ERR(cm_id);
1528
1529 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1530 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1531 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1532 work->mad_recv_wc->recv_buf.grh,
1533 &cm_id_priv->av);
1534 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1535 id.local_id);
1536 if (IS_ERR(cm_id_priv->timewait_info)) {
1537 ret = PTR_ERR(cm_id_priv->timewait_info);
1538 goto destroy;
1539 }
1540 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1541 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1542 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1543
1544 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1545 if (!listen_cm_id_priv) {
1546 ret = -EINVAL;
1547 kfree(cm_id_priv->timewait_info);
1548 goto destroy;
1549 }
1550
1551 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1552 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1553 cm_id_priv->id.service_id = req_msg->service_id;
1554 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1555
1556 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
1557 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1558 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1559 if (ret) {
1560 ib_get_cached_gid(work->port->cm_dev->ib_device,
1561 work->port->port_num, 0, &work->path[0].sgid);
1562 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1563 &work->path[0].sgid, sizeof work->path[0].sgid,
1564 NULL, 0);
1565 goto rejected;
1566 }
1567 if (req_msg->alt_local_lid) {
1568 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1569 if (ret) {
1570 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1571 &work->path[0].sgid,
1572 sizeof work->path[0].sgid, NULL, 0);
1573 goto rejected;
1574 }
1575 }
1576 cm_id_priv->tid = req_msg->hdr.tid;
1577 cm_id_priv->timeout_ms = cm_convert_to_ms(
1578 cm_req_get_local_resp_timeout(req_msg));
1579 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1580 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1581 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1582 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1583 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1584 cm_id_priv->pkey = req_msg->pkey;
1585 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1586 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1587 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1588 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1589
1590 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1591 cm_process_work(cm_id_priv, work);
1592 cm_deref_id(listen_cm_id_priv);
1593 return 0;
1594
1595 rejected:
1596 atomic_dec(&cm_id_priv->refcount);
1597 cm_deref_id(listen_cm_id_priv);
1598 destroy:
1599 ib_destroy_cm_id(cm_id);
1600 return ret;
1601 }
1602
1603 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1604 struct cm_id_private *cm_id_priv,
1605 struct ib_cm_rep_param *param)
1606 {
1607 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1608 rep_msg->local_comm_id = cm_id_priv->id.local_id;
1609 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1610 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1611 rep_msg->resp_resources = param->responder_resources;
1612 cm_rep_set_target_ack_delay(rep_msg,
1613 cm_id_priv->av.port->cm_dev->ack_delay);
1614 cm_rep_set_failover(rep_msg, param->failover_accepted);
1615 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1616 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1617
1618 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
1619 rep_msg->initiator_depth = param->initiator_depth;
1620 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1621 cm_rep_set_srq(rep_msg, param->srq);
1622 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1623 } else {
1624 cm_rep_set_srq(rep_msg, 1);
1625 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num));
1626 }
1627
1628 if (param->private_data && param->private_data_len)
1629 memcpy(rep_msg->private_data, param->private_data,
1630 param->private_data_len);
1631 }
1632
1633 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1634 struct ib_cm_rep_param *param)
1635 {
1636 struct cm_id_private *cm_id_priv;
1637 struct ib_mad_send_buf *msg;
1638 struct cm_rep_msg *rep_msg;
1639 unsigned long flags;
1640 int ret;
1641
1642 if (param->private_data &&
1643 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1644 return -EINVAL;
1645
1646 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1647 spin_lock_irqsave(&cm_id_priv->lock, flags);
1648 if (cm_id->state != IB_CM_REQ_RCVD &&
1649 cm_id->state != IB_CM_MRA_REQ_SENT) {
1650 ret = -EINVAL;
1651 goto out;
1652 }
1653
1654 ret = cm_alloc_msg(cm_id_priv, &msg);
1655 if (ret)
1656 goto out;
1657
1658 rep_msg = (struct cm_rep_msg *) msg->mad;
1659 cm_format_rep(rep_msg, cm_id_priv, param);
1660 msg->timeout_ms = cm_id_priv->timeout_ms;
1661 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1662
1663 ret = ib_post_send_mad(msg, NULL);
1664 if (ret) {
1665 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1666 cm_free_msg(msg);
1667 return ret;
1668 }
1669
1670 cm_id->state = IB_CM_REP_SENT;
1671 cm_id_priv->msg = msg;
1672 cm_id_priv->initiator_depth = param->initiator_depth;
1673 cm_id_priv->responder_resources = param->responder_resources;
1674 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1675 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
1676
1677 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1678 return ret;
1679 }
1680 EXPORT_SYMBOL(ib_send_cm_rep);
1681
1682 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1683 struct cm_id_private *cm_id_priv,
1684 const void *private_data,
1685 u8 private_data_len)
1686 {
1687 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1688 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1689 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1690
1691 if (private_data && private_data_len)
1692 memcpy(rtu_msg->private_data, private_data, private_data_len);
1693 }
1694
1695 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1696 const void *private_data,
1697 u8 private_data_len)
1698 {
1699 struct cm_id_private *cm_id_priv;
1700 struct ib_mad_send_buf *msg;
1701 unsigned long flags;
1702 void *data;
1703 int ret;
1704
1705 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1706 return -EINVAL;
1707
1708 data = cm_copy_private_data(private_data, private_data_len);
1709 if (IS_ERR(data))
1710 return PTR_ERR(data);
1711
1712 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1713 spin_lock_irqsave(&cm_id_priv->lock, flags);
1714 if (cm_id->state != IB_CM_REP_RCVD &&
1715 cm_id->state != IB_CM_MRA_REP_SENT) {
1716 ret = -EINVAL;
1717 goto error;
1718 }
1719
1720 ret = cm_alloc_msg(cm_id_priv, &msg);
1721 if (ret)
1722 goto error;
1723
1724 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1725 private_data, private_data_len);
1726
1727 ret = ib_post_send_mad(msg, NULL);
1728 if (ret) {
1729 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1730 cm_free_msg(msg);
1731 kfree(data);
1732 return ret;
1733 }
1734
1735 cm_id->state = IB_CM_ESTABLISHED;
1736 cm_set_private_data(cm_id_priv, data, private_data_len);
1737 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1738 return 0;
1739
1740 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1741 kfree(data);
1742 return ret;
1743 }
1744 EXPORT_SYMBOL(ib_send_cm_rtu);
1745
1746 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
1747 {
1748 struct cm_rep_msg *rep_msg;
1749 struct ib_cm_rep_event_param *param;
1750
1751 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1752 param = &work->cm_event.param.rep_rcvd;
1753 param->remote_ca_guid = rep_msg->local_ca_guid;
1754 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1755 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
1756 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1757 param->responder_resources = rep_msg->initiator_depth;
1758 param->initiator_depth = rep_msg->resp_resources;
1759 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1760 param->failover_accepted = cm_rep_get_failover(rep_msg);
1761 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1762 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1763 param->srq = cm_rep_get_srq(rep_msg);
1764 work->cm_event.private_data = &rep_msg->private_data;
1765 }
1766
1767 static void cm_dup_rep_handler(struct cm_work *work)
1768 {
1769 struct cm_id_private *cm_id_priv;
1770 struct cm_rep_msg *rep_msg;
1771 struct ib_mad_send_buf *msg = NULL;
1772 int ret;
1773
1774 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1775 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1776 rep_msg->local_comm_id);
1777 if (!cm_id_priv)
1778 return;
1779
1780 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1781 counter[CM_REP_COUNTER]);
1782 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1783 if (ret)
1784 goto deref;
1785
1786 spin_lock_irq(&cm_id_priv->lock);
1787 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1788 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1789 cm_id_priv->private_data,
1790 cm_id_priv->private_data_len);
1791 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1792 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1793 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1794 cm_id_priv->private_data,
1795 cm_id_priv->private_data_len);
1796 else
1797 goto unlock;
1798 spin_unlock_irq(&cm_id_priv->lock);
1799
1800 ret = ib_post_send_mad(msg, NULL);
1801 if (ret)
1802 goto free;
1803 goto deref;
1804
1805 unlock: spin_unlock_irq(&cm_id_priv->lock);
1806 free: cm_free_msg(msg);
1807 deref: cm_deref_id(cm_id_priv);
1808 }
1809
1810 static int cm_rep_handler(struct cm_work *work)
1811 {
1812 struct cm_id_private *cm_id_priv;
1813 struct cm_rep_msg *rep_msg;
1814 int ret;
1815
1816 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1817 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1818 if (!cm_id_priv) {
1819 cm_dup_rep_handler(work);
1820 return -EINVAL;
1821 }
1822
1823 cm_format_rep_event(work, cm_id_priv->qp_type);
1824
1825 spin_lock_irq(&cm_id_priv->lock);
1826 switch (cm_id_priv->id.state) {
1827 case IB_CM_REQ_SENT:
1828 case IB_CM_MRA_REQ_RCVD:
1829 break;
1830 default:
1831 spin_unlock_irq(&cm_id_priv->lock);
1832 ret = -EINVAL;
1833 goto error;
1834 }
1835
1836 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1837 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1838 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
1839
1840 spin_lock(&cm.lock);
1841 /* Check for duplicate REP. */
1842 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1843 spin_unlock(&cm.lock);
1844 spin_unlock_irq(&cm_id_priv->lock);
1845 ret = -EINVAL;
1846 goto error;
1847 }
1848 /* Check for a stale connection. */
1849 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1850 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1851 &cm.remote_id_table);
1852 cm_id_priv->timewait_info->inserted_remote_id = 0;
1853 spin_unlock(&cm.lock);
1854 spin_unlock_irq(&cm_id_priv->lock);
1855 cm_issue_rej(work->port, work->mad_recv_wc,
1856 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1857 NULL, 0);
1858 ret = -EINVAL;
1859 goto error;
1860 }
1861 spin_unlock(&cm.lock);
1862
1863 cm_id_priv->id.state = IB_CM_REP_RCVD;
1864 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1865 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
1866 cm_id_priv->initiator_depth = rep_msg->resp_resources;
1867 cm_id_priv->responder_resources = rep_msg->initiator_depth;
1868 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1869 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1870 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1871 cm_id_priv->av.timeout =
1872 cm_ack_timeout(cm_id_priv->target_ack_delay,
1873 cm_id_priv->av.timeout - 1);
1874 cm_id_priv->alt_av.timeout =
1875 cm_ack_timeout(cm_id_priv->target_ack_delay,
1876 cm_id_priv->alt_av.timeout - 1);
1877
1878 /* todo: handle peer_to_peer */
1879
1880 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1881 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1882 if (!ret)
1883 list_add_tail(&work->list, &cm_id_priv->work_list);
1884 spin_unlock_irq(&cm_id_priv->lock);
1885
1886 if (ret)
1887 cm_process_work(cm_id_priv, work);
1888 else
1889 cm_deref_id(cm_id_priv);
1890 return 0;
1891
1892 error:
1893 cm_deref_id(cm_id_priv);
1894 return ret;
1895 }
1896
1897 static int cm_establish_handler(struct cm_work *work)
1898 {
1899 struct cm_id_private *cm_id_priv;
1900 int ret;
1901
1902 /* See comment in cm_establish about lookup. */
1903 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1904 if (!cm_id_priv)
1905 return -EINVAL;
1906
1907 spin_lock_irq(&cm_id_priv->lock);
1908 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1909 spin_unlock_irq(&cm_id_priv->lock);
1910 goto out;
1911 }
1912
1913 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1914 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1915 if (!ret)
1916 list_add_tail(&work->list, &cm_id_priv->work_list);
1917 spin_unlock_irq(&cm_id_priv->lock);
1918
1919 if (ret)
1920 cm_process_work(cm_id_priv, work);
1921 else
1922 cm_deref_id(cm_id_priv);
1923 return 0;
1924 out:
1925 cm_deref_id(cm_id_priv);
1926 return -EINVAL;
1927 }
1928
1929 static int cm_rtu_handler(struct cm_work *work)
1930 {
1931 struct cm_id_private *cm_id_priv;
1932 struct cm_rtu_msg *rtu_msg;
1933 int ret;
1934
1935 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1936 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1937 rtu_msg->local_comm_id);
1938 if (!cm_id_priv)
1939 return -EINVAL;
1940
1941 work->cm_event.private_data = &rtu_msg->private_data;
1942
1943 spin_lock_irq(&cm_id_priv->lock);
1944 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1945 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1946 spin_unlock_irq(&cm_id_priv->lock);
1947 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1948 counter[CM_RTU_COUNTER]);
1949 goto out;
1950 }
1951 cm_id_priv->id.state = IB_CM_ESTABLISHED;
1952
1953 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1954 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1955 if (!ret)
1956 list_add_tail(&work->list, &cm_id_priv->work_list);
1957 spin_unlock_irq(&cm_id_priv->lock);
1958
1959 if (ret)
1960 cm_process_work(cm_id_priv, work);
1961 else
1962 cm_deref_id(cm_id_priv);
1963 return 0;
1964 out:
1965 cm_deref_id(cm_id_priv);
1966 return -EINVAL;
1967 }
1968
1969 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1970 struct cm_id_private *cm_id_priv,
1971 const void *private_data,
1972 u8 private_data_len)
1973 {
1974 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1975 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1976 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1977 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1978 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1979
1980 if (private_data && private_data_len)
1981 memcpy(dreq_msg->private_data, private_data, private_data_len);
1982 }
1983
1984 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1985 const void *private_data,
1986 u8 private_data_len)
1987 {
1988 struct cm_id_private *cm_id_priv;
1989 struct ib_mad_send_buf *msg;
1990 unsigned long flags;
1991 int ret;
1992
1993 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1994 return -EINVAL;
1995
1996 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1997 spin_lock_irqsave(&cm_id_priv->lock, flags);
1998 if (cm_id->state != IB_CM_ESTABLISHED) {
1999 ret = -EINVAL;
2000 goto out;
2001 }
2002
2003 if (cm_id->lap_state == IB_CM_LAP_SENT ||
2004 cm_id->lap_state == IB_CM_MRA_LAP_RCVD)
2005 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2006
2007 ret = cm_alloc_msg(cm_id_priv, &msg);
2008 if (ret) {
2009 cm_enter_timewait(cm_id_priv);
2010 goto out;
2011 }
2012
2013 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2014 private_data, private_data_len);
2015 msg->timeout_ms = cm_id_priv->timeout_ms;
2016 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2017
2018 ret = ib_post_send_mad(msg, NULL);
2019 if (ret) {
2020 cm_enter_timewait(cm_id_priv);
2021 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2022 cm_free_msg(msg);
2023 return ret;
2024 }
2025
2026 cm_id->state = IB_CM_DREQ_SENT;
2027 cm_id_priv->msg = msg;
2028 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2029 return ret;
2030 }
2031 EXPORT_SYMBOL(ib_send_cm_dreq);
2032
2033 static void cm_format_drep(struct cm_drep_msg *drep_msg,
2034 struct cm_id_private *cm_id_priv,
2035 const void *private_data,
2036 u8 private_data_len)
2037 {
2038 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2039 drep_msg->local_comm_id = cm_id_priv->id.local_id;
2040 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2041
2042 if (private_data && private_data_len)
2043 memcpy(drep_msg->private_data, private_data, private_data_len);
2044 }
2045
2046 int ib_send_cm_drep(struct ib_cm_id *cm_id,
2047 const void *private_data,
2048 u8 private_data_len)
2049 {
2050 struct cm_id_private *cm_id_priv;
2051 struct ib_mad_send_buf *msg;
2052 unsigned long flags;
2053 void *data;
2054 int ret;
2055
2056 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2057 return -EINVAL;
2058
2059 data = cm_copy_private_data(private_data, private_data_len);
2060 if (IS_ERR(data))
2061 return PTR_ERR(data);
2062
2063 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2064 spin_lock_irqsave(&cm_id_priv->lock, flags);
2065 if (cm_id->state != IB_CM_DREQ_RCVD) {
2066 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2067 kfree(data);
2068 return -EINVAL;
2069 }
2070
2071 cm_set_private_data(cm_id_priv, data, private_data_len);
2072 cm_enter_timewait(cm_id_priv);
2073
2074 ret = cm_alloc_msg(cm_id_priv, &msg);
2075 if (ret)
2076 goto out;
2077
2078 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2079 private_data, private_data_len);
2080
2081 ret = ib_post_send_mad(msg, NULL);
2082 if (ret) {
2083 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2084 cm_free_msg(msg);
2085 return ret;
2086 }
2087
2088 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2089 return ret;
2090 }
2091 EXPORT_SYMBOL(ib_send_cm_drep);
2092
2093 static int cm_issue_drep(struct cm_port *port,
2094 struct ib_mad_recv_wc *mad_recv_wc)
2095 {
2096 struct ib_mad_send_buf *msg = NULL;
2097 struct cm_dreq_msg *dreq_msg;
2098 struct cm_drep_msg *drep_msg;
2099 int ret;
2100
2101 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2102 if (ret)
2103 return ret;
2104
2105 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2106 drep_msg = (struct cm_drep_msg *) msg->mad;
2107
2108 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2109 drep_msg->remote_comm_id = dreq_msg->local_comm_id;
2110 drep_msg->local_comm_id = dreq_msg->remote_comm_id;
2111
2112 ret = ib_post_send_mad(msg, NULL);
2113 if (ret)
2114 cm_free_msg(msg);
2115
2116 return ret;
2117 }
2118
2119 static int cm_dreq_handler(struct cm_work *work)
2120 {
2121 struct cm_id_private *cm_id_priv;
2122 struct cm_dreq_msg *dreq_msg;
2123 struct ib_mad_send_buf *msg = NULL;
2124 int ret;
2125
2126 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2127 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
2128 dreq_msg->local_comm_id);
2129 if (!cm_id_priv) {
2130 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2131 counter[CM_DREQ_COUNTER]);
2132 cm_issue_drep(work->port, work->mad_recv_wc);
2133 return -EINVAL;
2134 }
2135
2136 work->cm_event.private_data = &dreq_msg->private_data;
2137
2138 spin_lock_irq(&cm_id_priv->lock);
2139 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
2140 goto unlock;
2141
2142 switch (cm_id_priv->id.state) {
2143 case IB_CM_REP_SENT:
2144 case IB_CM_DREQ_SENT:
2145 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2146 break;
2147 case IB_CM_ESTABLISHED:
2148 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2149 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2150 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2151 break;
2152 case IB_CM_MRA_REP_RCVD:
2153 break;
2154 case IB_CM_TIMEWAIT:
2155 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2156 counter[CM_DREQ_COUNTER]);
2157 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2158 goto unlock;
2159
2160 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2161 cm_id_priv->private_data,
2162 cm_id_priv->private_data_len);
2163 spin_unlock_irq(&cm_id_priv->lock);
2164
2165 if (ib_post_send_mad(msg, NULL))
2166 cm_free_msg(msg);
2167 goto deref;
2168 case IB_CM_DREQ_RCVD:
2169 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2170 counter[CM_DREQ_COUNTER]);
2171 goto unlock;
2172 default:
2173 goto unlock;
2174 }
2175 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2176 cm_id_priv->tid = dreq_msg->hdr.tid;
2177 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2178 if (!ret)
2179 list_add_tail(&work->list, &cm_id_priv->work_list);
2180 spin_unlock_irq(&cm_id_priv->lock);
2181
2182 if (ret)
2183 cm_process_work(cm_id_priv, work);
2184 else
2185 cm_deref_id(cm_id_priv);
2186 return 0;
2187
2188 unlock: spin_unlock_irq(&cm_id_priv->lock);
2189 deref: cm_deref_id(cm_id_priv);
2190 return -EINVAL;
2191 }
2192
2193 static int cm_drep_handler(struct cm_work *work)
2194 {
2195 struct cm_id_private *cm_id_priv;
2196 struct cm_drep_msg *drep_msg;
2197 int ret;
2198
2199 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2200 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2201 drep_msg->local_comm_id);
2202 if (!cm_id_priv)
2203 return -EINVAL;
2204
2205 work->cm_event.private_data = &drep_msg->private_data;
2206
2207 spin_lock_irq(&cm_id_priv->lock);
2208 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2209 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2210 spin_unlock_irq(&cm_id_priv->lock);
2211 goto out;
2212 }
2213 cm_enter_timewait(cm_id_priv);
2214
2215 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2216 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2217 if (!ret)
2218 list_add_tail(&work->list, &cm_id_priv->work_list);
2219 spin_unlock_irq(&cm_id_priv->lock);
2220
2221 if (ret)
2222 cm_process_work(cm_id_priv, work);
2223 else
2224 cm_deref_id(cm_id_priv);
2225 return 0;
2226 out:
2227 cm_deref_id(cm_id_priv);
2228 return -EINVAL;
2229 }
2230
2231 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2232 enum ib_cm_rej_reason reason,
2233 void *ari,
2234 u8 ari_length,
2235 const void *private_data,
2236 u8 private_data_len)
2237 {
2238 struct cm_id_private *cm_id_priv;
2239 struct ib_mad_send_buf *msg;
2240 unsigned long flags;
2241 int ret;
2242
2243 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2244 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2245 return -EINVAL;
2246
2247 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2248
2249 spin_lock_irqsave(&cm_id_priv->lock, flags);
2250 switch (cm_id->state) {
2251 case IB_CM_REQ_SENT:
2252 case IB_CM_MRA_REQ_RCVD:
2253 case IB_CM_REQ_RCVD:
2254 case IB_CM_MRA_REQ_SENT:
2255 case IB_CM_REP_RCVD:
2256 case IB_CM_MRA_REP_SENT:
2257 ret = cm_alloc_msg(cm_id_priv, &msg);
2258 if (!ret)
2259 cm_format_rej((struct cm_rej_msg *) msg->mad,
2260 cm_id_priv, reason, ari, ari_length,
2261 private_data, private_data_len);
2262
2263 cm_reset_to_idle(cm_id_priv);
2264 break;
2265 case IB_CM_REP_SENT:
2266 case IB_CM_MRA_REP_RCVD:
2267 ret = cm_alloc_msg(cm_id_priv, &msg);
2268 if (!ret)
2269 cm_format_rej((struct cm_rej_msg *) msg->mad,
2270 cm_id_priv, reason, ari, ari_length,
2271 private_data, private_data_len);
2272
2273 cm_enter_timewait(cm_id_priv);
2274 break;
2275 default:
2276 ret = -EINVAL;
2277 goto out;
2278 }
2279
2280 if (ret)
2281 goto out;
2282
2283 ret = ib_post_send_mad(msg, NULL);
2284 if (ret)
2285 cm_free_msg(msg);
2286
2287 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2288 return ret;
2289 }
2290 EXPORT_SYMBOL(ib_send_cm_rej);
2291
2292 static void cm_format_rej_event(struct cm_work *work)
2293 {
2294 struct cm_rej_msg *rej_msg;
2295 struct ib_cm_rej_event_param *param;
2296
2297 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2298 param = &work->cm_event.param.rej_rcvd;
2299 param->ari = rej_msg->ari;
2300 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2301 param->reason = __be16_to_cpu(rej_msg->reason);
2302 work->cm_event.private_data = &rej_msg->private_data;
2303 }
2304
2305 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2306 {
2307 struct cm_timewait_info *timewait_info;
2308 struct cm_id_private *cm_id_priv;
2309 __be32 remote_id;
2310
2311 remote_id = rej_msg->local_comm_id;
2312
2313 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2314 spin_lock_irq(&cm.lock);
2315 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2316 remote_id);
2317 if (!timewait_info) {
2318 spin_unlock_irq(&cm.lock);
2319 return NULL;
2320 }
2321 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2322 (timewait_info->work.local_id ^
2323 cm.random_id_operand));
2324 if (cm_id_priv) {
2325 if (cm_id_priv->id.remote_id == remote_id)
2326 atomic_inc(&cm_id_priv->refcount);
2327 else
2328 cm_id_priv = NULL;
2329 }
2330 spin_unlock_irq(&cm.lock);
2331 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2332 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2333 else
2334 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2335
2336 return cm_id_priv;
2337 }
2338
2339 static int cm_rej_handler(struct cm_work *work)
2340 {
2341 struct cm_id_private *cm_id_priv;
2342 struct cm_rej_msg *rej_msg;
2343 int ret;
2344
2345 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2346 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2347 if (!cm_id_priv)
2348 return -EINVAL;
2349
2350 cm_format_rej_event(work);
2351
2352 spin_lock_irq(&cm_id_priv->lock);
2353 switch (cm_id_priv->id.state) {
2354 case IB_CM_REQ_SENT:
2355 case IB_CM_MRA_REQ_RCVD:
2356 case IB_CM_REP_SENT:
2357 case IB_CM_MRA_REP_RCVD:
2358 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2359 /* fall through */
2360 case IB_CM_REQ_RCVD:
2361 case IB_CM_MRA_REQ_SENT:
2362 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2363 cm_enter_timewait(cm_id_priv);
2364 else
2365 cm_reset_to_idle(cm_id_priv);
2366 break;
2367 case IB_CM_DREQ_SENT:
2368 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2369 /* fall through */
2370 case IB_CM_REP_RCVD:
2371 case IB_CM_MRA_REP_SENT:
2372 cm_enter_timewait(cm_id_priv);
2373 break;
2374 case IB_CM_ESTABLISHED:
2375 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
2376 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
2377 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
2378 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2379 cm_id_priv->msg);
2380 cm_enter_timewait(cm_id_priv);
2381 break;
2382 }
2383 /* fall through */
2384 default:
2385 spin_unlock_irq(&cm_id_priv->lock);
2386 ret = -EINVAL;
2387 goto out;
2388 }
2389
2390 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2391 if (!ret)
2392 list_add_tail(&work->list, &cm_id_priv->work_list);
2393 spin_unlock_irq(&cm_id_priv->lock);
2394
2395 if (ret)
2396 cm_process_work(cm_id_priv, work);
2397 else
2398 cm_deref_id(cm_id_priv);
2399 return 0;
2400 out:
2401 cm_deref_id(cm_id_priv);
2402 return -EINVAL;
2403 }
2404
2405 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2406 u8 service_timeout,
2407 const void *private_data,
2408 u8 private_data_len)
2409 {
2410 struct cm_id_private *cm_id_priv;
2411 struct ib_mad_send_buf *msg;
2412 enum ib_cm_state cm_state;
2413 enum ib_cm_lap_state lap_state;
2414 enum cm_msg_response msg_response;
2415 void *data;
2416 unsigned long flags;
2417 int ret;
2418
2419 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2420 return -EINVAL;
2421
2422 data = cm_copy_private_data(private_data, private_data_len);
2423 if (IS_ERR(data))
2424 return PTR_ERR(data);
2425
2426 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2427
2428 spin_lock_irqsave(&cm_id_priv->lock, flags);
2429 switch(cm_id_priv->id.state) {
2430 case IB_CM_REQ_RCVD:
2431 cm_state = IB_CM_MRA_REQ_SENT;
2432 lap_state = cm_id->lap_state;
2433 msg_response = CM_MSG_RESPONSE_REQ;
2434 break;
2435 case IB_CM_REP_RCVD:
2436 cm_state = IB_CM_MRA_REP_SENT;
2437 lap_state = cm_id->lap_state;
2438 msg_response = CM_MSG_RESPONSE_REP;
2439 break;
2440 case IB_CM_ESTABLISHED:
2441 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
2442 cm_state = cm_id->state;
2443 lap_state = IB_CM_MRA_LAP_SENT;
2444 msg_response = CM_MSG_RESPONSE_OTHER;
2445 break;
2446 }
2447 default:
2448 ret = -EINVAL;
2449 goto error1;
2450 }
2451
2452 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
2453 ret = cm_alloc_msg(cm_id_priv, &msg);
2454 if (ret)
2455 goto error1;
2456
2457 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2458 msg_response, service_timeout,
2459 private_data, private_data_len);
2460 ret = ib_post_send_mad(msg, NULL);
2461 if (ret)
2462 goto error2;
2463 }
2464
2465 cm_id->state = cm_state;
2466 cm_id->lap_state = lap_state;
2467 cm_id_priv->service_timeout = service_timeout;
2468 cm_set_private_data(cm_id_priv, data, private_data_len);
2469 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2470 return 0;
2471
2472 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2473 kfree(data);
2474 return ret;
2475
2476 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2477 kfree(data);
2478 cm_free_msg(msg);
2479 return ret;
2480 }
2481 EXPORT_SYMBOL(ib_send_cm_mra);
2482
2483 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2484 {
2485 switch (cm_mra_get_msg_mraed(mra_msg)) {
2486 case CM_MSG_RESPONSE_REQ:
2487 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2488 case CM_MSG_RESPONSE_REP:
2489 case CM_MSG_RESPONSE_OTHER:
2490 return cm_acquire_id(mra_msg->remote_comm_id,
2491 mra_msg->local_comm_id);
2492 default:
2493 return NULL;
2494 }
2495 }
2496
2497 static int cm_mra_handler(struct cm_work *work)
2498 {
2499 struct cm_id_private *cm_id_priv;
2500 struct cm_mra_msg *mra_msg;
2501 int timeout, ret;
2502
2503 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2504 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2505 if (!cm_id_priv)
2506 return -EINVAL;
2507
2508 work->cm_event.private_data = &mra_msg->private_data;
2509 work->cm_event.param.mra_rcvd.service_timeout =
2510 cm_mra_get_service_timeout(mra_msg);
2511 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2512 cm_convert_to_ms(cm_id_priv->av.timeout);
2513
2514 spin_lock_irq(&cm_id_priv->lock);
2515 switch (cm_id_priv->id.state) {
2516 case IB_CM_REQ_SENT:
2517 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2518 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2519 cm_id_priv->msg, timeout))
2520 goto out;
2521 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2522 break;
2523 case IB_CM_REP_SENT:
2524 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2525 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2526 cm_id_priv->msg, timeout))
2527 goto out;
2528 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2529 break;
2530 case IB_CM_ESTABLISHED:
2531 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2532 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2533 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2534 cm_id_priv->msg, timeout)) {
2535 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2536 atomic_long_inc(&work->port->
2537 counter_group[CM_RECV_DUPLICATES].
2538 counter[CM_MRA_COUNTER]);
2539 goto out;
2540 }
2541 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2542 break;
2543 case IB_CM_MRA_REQ_RCVD:
2544 case IB_CM_MRA_REP_RCVD:
2545 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2546 counter[CM_MRA_COUNTER]);
2547 /* fall through */
2548 default:
2549 goto out;
2550 }
2551
2552 cm_id_priv->msg->context[1] = (void *) (unsigned long)
2553 cm_id_priv->id.state;
2554 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2555 if (!ret)
2556 list_add_tail(&work->list, &cm_id_priv->work_list);
2557 spin_unlock_irq(&cm_id_priv->lock);
2558
2559 if (ret)
2560 cm_process_work(cm_id_priv, work);
2561 else
2562 cm_deref_id(cm_id_priv);
2563 return 0;
2564 out:
2565 spin_unlock_irq(&cm_id_priv->lock);
2566 cm_deref_id(cm_id_priv);
2567 return -EINVAL;
2568 }
2569
2570 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2571 struct cm_id_private *cm_id_priv,
2572 struct ib_sa_path_rec *alternate_path,
2573 const void *private_data,
2574 u8 private_data_len)
2575 {
2576 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2577 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2578 lap_msg->local_comm_id = cm_id_priv->id.local_id;
2579 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2580 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2581 /* todo: need remote CM response timeout */
2582 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2583 lap_msg->alt_local_lid = alternate_path->slid;
2584 lap_msg->alt_remote_lid = alternate_path->dlid;
2585 lap_msg->alt_local_gid = alternate_path->sgid;
2586 lap_msg->alt_remote_gid = alternate_path->dgid;
2587 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2588 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2589 lap_msg->alt_hop_limit = alternate_path->hop_limit;
2590 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2591 cm_lap_set_sl(lap_msg, alternate_path->sl);
2592 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2593 cm_lap_set_local_ack_timeout(lap_msg,
2594 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
2595 alternate_path->packet_life_time));
2596
2597 if (private_data && private_data_len)
2598 memcpy(lap_msg->private_data, private_data, private_data_len);
2599 }
2600
2601 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2602 struct ib_sa_path_rec *alternate_path,
2603 const void *private_data,
2604 u8 private_data_len)
2605 {
2606 struct cm_id_private *cm_id_priv;
2607 struct ib_mad_send_buf *msg;
2608 unsigned long flags;
2609 int ret;
2610
2611 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2612 return -EINVAL;
2613
2614 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2615 spin_lock_irqsave(&cm_id_priv->lock, flags);
2616 if (cm_id->state != IB_CM_ESTABLISHED ||
2617 (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2618 cm_id->lap_state != IB_CM_LAP_IDLE)) {
2619 ret = -EINVAL;
2620 goto out;
2621 }
2622
2623 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
2624 if (ret)
2625 goto out;
2626 cm_id_priv->alt_av.timeout =
2627 cm_ack_timeout(cm_id_priv->target_ack_delay,
2628 cm_id_priv->alt_av.timeout - 1);
2629
2630 ret = cm_alloc_msg(cm_id_priv, &msg);
2631 if (ret)
2632 goto out;
2633
2634 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2635 alternate_path, private_data, private_data_len);
2636 msg->timeout_ms = cm_id_priv->timeout_ms;
2637 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2638
2639 ret = ib_post_send_mad(msg, NULL);
2640 if (ret) {
2641 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2642 cm_free_msg(msg);
2643 return ret;
2644 }
2645
2646 cm_id->lap_state = IB_CM_LAP_SENT;
2647 cm_id_priv->msg = msg;
2648
2649 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2650 return ret;
2651 }
2652 EXPORT_SYMBOL(ib_send_cm_lap);
2653
2654 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2655 struct ib_sa_path_rec *path,
2656 struct cm_lap_msg *lap_msg)
2657 {
2658 memset(path, 0, sizeof *path);
2659 path->dgid = lap_msg->alt_local_gid;
2660 path->sgid = lap_msg->alt_remote_gid;
2661 path->dlid = lap_msg->alt_local_lid;
2662 path->slid = lap_msg->alt_remote_lid;
2663 path->flow_label = cm_lap_get_flow_label(lap_msg);
2664 path->hop_limit = lap_msg->alt_hop_limit;
2665 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2666 path->reversible = 1;
2667 path->pkey = cm_id_priv->pkey;
2668 path->sl = cm_lap_get_sl(lap_msg);
2669 path->mtu_selector = IB_SA_EQ;
2670 path->mtu = cm_id_priv->path_mtu;
2671 path->rate_selector = IB_SA_EQ;
2672 path->rate = cm_lap_get_packet_rate(lap_msg);
2673 path->packet_life_time_selector = IB_SA_EQ;
2674 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2675 path->packet_life_time -= (path->packet_life_time > 0);
2676 }
2677
2678 static int cm_lap_handler(struct cm_work *work)
2679 {
2680 struct cm_id_private *cm_id_priv;
2681 struct cm_lap_msg *lap_msg;
2682 struct ib_cm_lap_event_param *param;
2683 struct ib_mad_send_buf *msg = NULL;
2684 int ret;
2685
2686 /* todo: verify LAP request and send reject APR if invalid. */
2687 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2688 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2689 lap_msg->local_comm_id);
2690 if (!cm_id_priv)
2691 return -EINVAL;
2692
2693 param = &work->cm_event.param.lap_rcvd;
2694 param->alternate_path = &work->path[0];
2695 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
2696 work->cm_event.private_data = &lap_msg->private_data;
2697
2698 spin_lock_irq(&cm_id_priv->lock);
2699 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2700 goto unlock;
2701
2702 switch (cm_id_priv->id.lap_state) {
2703 case IB_CM_LAP_UNINIT:
2704 case IB_CM_LAP_IDLE:
2705 break;
2706 case IB_CM_MRA_LAP_SENT:
2707 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2708 counter[CM_LAP_COUNTER]);
2709 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2710 goto unlock;
2711
2712 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2713 CM_MSG_RESPONSE_OTHER,
2714 cm_id_priv->service_timeout,
2715 cm_id_priv->private_data,
2716 cm_id_priv->private_data_len);
2717 spin_unlock_irq(&cm_id_priv->lock);
2718
2719 if (ib_post_send_mad(msg, NULL))
2720 cm_free_msg(msg);
2721 goto deref;
2722 case IB_CM_LAP_RCVD:
2723 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2724 counter[CM_LAP_COUNTER]);
2725 goto unlock;
2726 default:
2727 goto unlock;
2728 }
2729
2730 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2731 cm_id_priv->tid = lap_msg->hdr.tid;
2732 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2733 work->mad_recv_wc->recv_buf.grh,
2734 &cm_id_priv->av);
2735 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
2736 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2737 if (!ret)
2738 list_add_tail(&work->list, &cm_id_priv->work_list);
2739 spin_unlock_irq(&cm_id_priv->lock);
2740
2741 if (ret)
2742 cm_process_work(cm_id_priv, work);
2743 else
2744 cm_deref_id(cm_id_priv);
2745 return 0;
2746
2747 unlock: spin_unlock_irq(&cm_id_priv->lock);
2748 deref: cm_deref_id(cm_id_priv);
2749 return -EINVAL;
2750 }
2751
2752 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2753 struct cm_id_private *cm_id_priv,
2754 enum ib_cm_apr_status status,
2755 void *info,
2756 u8 info_length,
2757 const void *private_data,
2758 u8 private_data_len)
2759 {
2760 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2761 apr_msg->local_comm_id = cm_id_priv->id.local_id;
2762 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2763 apr_msg->ap_status = (u8) status;
2764
2765 if (info && info_length) {
2766 apr_msg->info_length = info_length;
2767 memcpy(apr_msg->info, info, info_length);
2768 }
2769
2770 if (private_data && private_data_len)
2771 memcpy(apr_msg->private_data, private_data, private_data_len);
2772 }
2773
2774 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2775 enum ib_cm_apr_status status,
2776 void *info,
2777 u8 info_length,
2778 const void *private_data,
2779 u8 private_data_len)
2780 {
2781 struct cm_id_private *cm_id_priv;
2782 struct ib_mad_send_buf *msg;
2783 unsigned long flags;
2784 int ret;
2785
2786 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2787 (info && info_length > IB_CM_APR_INFO_LENGTH))
2788 return -EINVAL;
2789
2790 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2791 spin_lock_irqsave(&cm_id_priv->lock, flags);
2792 if (cm_id->state != IB_CM_ESTABLISHED ||
2793 (cm_id->lap_state != IB_CM_LAP_RCVD &&
2794 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2795 ret = -EINVAL;
2796 goto out;
2797 }
2798
2799 ret = cm_alloc_msg(cm_id_priv, &msg);
2800 if (ret)
2801 goto out;
2802
2803 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2804 info, info_length, private_data, private_data_len);
2805 ret = ib_post_send_mad(msg, NULL);
2806 if (ret) {
2807 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2808 cm_free_msg(msg);
2809 return ret;
2810 }
2811
2812 cm_id->lap_state = IB_CM_LAP_IDLE;
2813 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2814 return ret;
2815 }
2816 EXPORT_SYMBOL(ib_send_cm_apr);
2817
2818 static int cm_apr_handler(struct cm_work *work)
2819 {
2820 struct cm_id_private *cm_id_priv;
2821 struct cm_apr_msg *apr_msg;
2822 int ret;
2823
2824 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2825 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2826 apr_msg->local_comm_id);
2827 if (!cm_id_priv)
2828 return -EINVAL; /* Unmatched reply. */
2829
2830 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2831 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2832 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2833 work->cm_event.private_data = &apr_msg->private_data;
2834
2835 spin_lock_irq(&cm_id_priv->lock);
2836 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2837 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2838 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2839 spin_unlock_irq(&cm_id_priv->lock);
2840 goto out;
2841 }
2842 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2843 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2844 cm_id_priv->msg = NULL;
2845
2846 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2847 if (!ret)
2848 list_add_tail(&work->list, &cm_id_priv->work_list);
2849 spin_unlock_irq(&cm_id_priv->lock);
2850
2851 if (ret)
2852 cm_process_work(cm_id_priv, work);
2853 else
2854 cm_deref_id(cm_id_priv);
2855 return 0;
2856 out:
2857 cm_deref_id(cm_id_priv);
2858 return -EINVAL;
2859 }
2860
2861 static int cm_timewait_handler(struct cm_work *work)
2862 {
2863 struct cm_timewait_info *timewait_info;
2864 struct cm_id_private *cm_id_priv;
2865 int ret;
2866
2867 timewait_info = (struct cm_timewait_info *)work;
2868 spin_lock_irq(&cm.lock);
2869 list_del(&timewait_info->list);
2870 spin_unlock_irq(&cm.lock);
2871
2872 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2873 timewait_info->work.remote_id);
2874 if (!cm_id_priv)
2875 return -EINVAL;
2876
2877 spin_lock_irq(&cm_id_priv->lock);
2878 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2879 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2880 spin_unlock_irq(&cm_id_priv->lock);
2881 goto out;
2882 }
2883 cm_id_priv->id.state = IB_CM_IDLE;
2884 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2885 if (!ret)
2886 list_add_tail(&work->list, &cm_id_priv->work_list);
2887 spin_unlock_irq(&cm_id_priv->lock);
2888
2889 if (ret)
2890 cm_process_work(cm_id_priv, work);
2891 else
2892 cm_deref_id(cm_id_priv);
2893 return 0;
2894 out:
2895 cm_deref_id(cm_id_priv);
2896 return -EINVAL;
2897 }
2898
2899 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2900 struct cm_id_private *cm_id_priv,
2901 struct ib_cm_sidr_req_param *param)
2902 {
2903 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2904 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2905 sidr_req_msg->request_id = cm_id_priv->id.local_id;
2906 sidr_req_msg->pkey = param->path->pkey;
2907 sidr_req_msg->service_id = param->service_id;
2908
2909 if (param->private_data && param->private_data_len)
2910 memcpy(sidr_req_msg->private_data, param->private_data,
2911 param->private_data_len);
2912 }
2913
2914 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2915 struct ib_cm_sidr_req_param *param)
2916 {
2917 struct cm_id_private *cm_id_priv;
2918 struct ib_mad_send_buf *msg;
2919 unsigned long flags;
2920 int ret;
2921
2922 if (!param->path || (param->private_data &&
2923 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2924 return -EINVAL;
2925
2926 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2927 ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2928 if (ret)
2929 goto out;
2930
2931 cm_id->service_id = param->service_id;
2932 cm_id->service_mask = ~cpu_to_be64(0);
2933 cm_id_priv->timeout_ms = param->timeout_ms;
2934 cm_id_priv->max_cm_retries = param->max_cm_retries;
2935 ret = cm_alloc_msg(cm_id_priv, &msg);
2936 if (ret)
2937 goto out;
2938
2939 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2940 param);
2941 msg->timeout_ms = cm_id_priv->timeout_ms;
2942 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2943
2944 spin_lock_irqsave(&cm_id_priv->lock, flags);
2945 if (cm_id->state == IB_CM_IDLE)
2946 ret = ib_post_send_mad(msg, NULL);
2947 else
2948 ret = -EINVAL;
2949
2950 if (ret) {
2951 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2952 cm_free_msg(msg);
2953 goto out;
2954 }
2955 cm_id->state = IB_CM_SIDR_REQ_SENT;
2956 cm_id_priv->msg = msg;
2957 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2958 out:
2959 return ret;
2960 }
2961 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2962
2963 static void cm_format_sidr_req_event(struct cm_work *work,
2964 struct ib_cm_id *listen_id)
2965 {
2966 struct cm_sidr_req_msg *sidr_req_msg;
2967 struct ib_cm_sidr_req_event_param *param;
2968
2969 sidr_req_msg = (struct cm_sidr_req_msg *)
2970 work->mad_recv_wc->recv_buf.mad;
2971 param = &work->cm_event.param.sidr_req_rcvd;
2972 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2973 param->listen_id = listen_id;
2974 param->port = work->port->port_num;
2975 work->cm_event.private_data = &sidr_req_msg->private_data;
2976 }
2977
2978 static int cm_sidr_req_handler(struct cm_work *work)
2979 {
2980 struct ib_cm_id *cm_id;
2981 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2982 struct cm_sidr_req_msg *sidr_req_msg;
2983 struct ib_wc *wc;
2984
2985 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
2986 if (IS_ERR(cm_id))
2987 return PTR_ERR(cm_id);
2988 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2989
2990 /* Record SGID/SLID and request ID for lookup. */
2991 sidr_req_msg = (struct cm_sidr_req_msg *)
2992 work->mad_recv_wc->recv_buf.mad;
2993 wc = work->mad_recv_wc->wc;
2994 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2995 cm_id_priv->av.dgid.global.interface_id = 0;
2996 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2997 work->mad_recv_wc->recv_buf.grh,
2998 &cm_id_priv->av);
2999 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
3000 cm_id_priv->tid = sidr_req_msg->hdr.tid;
3001 atomic_inc(&cm_id_priv->work_count);
3002
3003 spin_lock_irq(&cm.lock);
3004 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3005 if (cur_cm_id_priv) {
3006 spin_unlock_irq(&cm.lock);
3007 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3008 counter[CM_SIDR_REQ_COUNTER]);
3009 goto out; /* Duplicate message. */
3010 }
3011 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3012 cur_cm_id_priv = cm_find_listen(cm_id->device,
3013 sidr_req_msg->service_id,
3014 sidr_req_msg->private_data);
3015 if (!cur_cm_id_priv) {
3016 spin_unlock_irq(&cm.lock);
3017 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED);
3018 goto out; /* No match. */
3019 }
3020 atomic_inc(&cur_cm_id_priv->refcount);
3021 atomic_inc(&cm_id_priv->refcount);
3022 spin_unlock_irq(&cm.lock);
3023
3024 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
3025 cm_id_priv->id.context = cur_cm_id_priv->id.context;
3026 cm_id_priv->id.service_id = sidr_req_msg->service_id;
3027 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3028
3029 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
3030 cm_process_work(cm_id_priv, work);
3031 cm_deref_id(cur_cm_id_priv);
3032 return 0;
3033 out:
3034 ib_destroy_cm_id(&cm_id_priv->id);
3035 return -EINVAL;
3036 }
3037
3038 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3039 struct cm_id_private *cm_id_priv,
3040 struct ib_cm_sidr_rep_param *param)
3041 {
3042 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3043 cm_id_priv->tid);
3044 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
3045 sidr_rep_msg->status = param->status;
3046 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
3047 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
3048 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
3049
3050 if (param->info && param->info_length)
3051 memcpy(sidr_rep_msg->info, param->info, param->info_length);
3052
3053 if (param->private_data && param->private_data_len)
3054 memcpy(sidr_rep_msg->private_data, param->private_data,
3055 param->private_data_len);
3056 }
3057
3058 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3059 struct ib_cm_sidr_rep_param *param)
3060 {
3061 struct cm_id_private *cm_id_priv;
3062 struct ib_mad_send_buf *msg;
3063 unsigned long flags;
3064 int ret;
3065
3066 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3067 (param->private_data &&
3068 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3069 return -EINVAL;
3070
3071 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3072 spin_lock_irqsave(&cm_id_priv->lock, flags);
3073 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
3074 ret = -EINVAL;
3075 goto error;
3076 }
3077
3078 ret = cm_alloc_msg(cm_id_priv, &msg);
3079 if (ret)
3080 goto error;
3081
3082 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3083 param);
3084 ret = ib_post_send_mad(msg, NULL);
3085 if (ret) {
3086 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3087 cm_free_msg(msg);
3088 return ret;
3089 }
3090 cm_id->state = IB_CM_IDLE;
3091 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3092
3093 spin_lock_irqsave(&cm.lock, flags);
3094 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3095 spin_unlock_irqrestore(&cm.lock, flags);
3096 return 0;
3097
3098 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3099 return ret;
3100 }
3101 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3102
3103 static void cm_format_sidr_rep_event(struct cm_work *work)
3104 {
3105 struct cm_sidr_rep_msg *sidr_rep_msg;
3106 struct ib_cm_sidr_rep_event_param *param;
3107
3108 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3109 work->mad_recv_wc->recv_buf.mad;
3110 param = &work->cm_event.param.sidr_rep_rcvd;
3111 param->status = sidr_rep_msg->status;
3112 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
3113 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
3114 param->info = &sidr_rep_msg->info;
3115 param->info_len = sidr_rep_msg->info_length;
3116 work->cm_event.private_data = &sidr_rep_msg->private_data;
3117 }
3118
3119 static int cm_sidr_rep_handler(struct cm_work *work)
3120 {
3121 struct cm_sidr_rep_msg *sidr_rep_msg;
3122 struct cm_id_private *cm_id_priv;
3123
3124 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3125 work->mad_recv_wc->recv_buf.mad;
3126 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
3127 if (!cm_id_priv)
3128 return -EINVAL; /* Unmatched reply. */
3129
3130 spin_lock_irq(&cm_id_priv->lock);
3131 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3132 spin_unlock_irq(&cm_id_priv->lock);
3133 goto out;
3134 }
3135 cm_id_priv->id.state = IB_CM_IDLE;
3136 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3137 spin_unlock_irq(&cm_id_priv->lock);
3138
3139 cm_format_sidr_rep_event(work);
3140 cm_process_work(cm_id_priv, work);
3141 return 0;
3142 out:
3143 cm_deref_id(cm_id_priv);
3144 return -EINVAL;
3145 }
3146
3147 static void cm_process_send_error(struct ib_mad_send_buf *msg,
3148 enum ib_wc_status wc_status)
3149 {
3150 struct cm_id_private *cm_id_priv;
3151 struct ib_cm_event cm_event;
3152 enum ib_cm_state state;
3153 int ret;
3154
3155 memset(&cm_event, 0, sizeof cm_event);
3156 cm_id_priv = msg->context[0];
3157
3158 /* Discard old sends or ones without a response. */
3159 spin_lock_irq(&cm_id_priv->lock);
3160 state = (enum ib_cm_state) (unsigned long) msg->context[1];
3161 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3162 goto discard;
3163
3164 switch (state) {
3165 case IB_CM_REQ_SENT:
3166 case IB_CM_MRA_REQ_RCVD:
3167 cm_reset_to_idle(cm_id_priv);
3168 cm_event.event = IB_CM_REQ_ERROR;
3169 break;
3170 case IB_CM_REP_SENT:
3171 case IB_CM_MRA_REP_RCVD:
3172 cm_reset_to_idle(cm_id_priv);
3173 cm_event.event = IB_CM_REP_ERROR;
3174 break;
3175 case IB_CM_DREQ_SENT:
3176 cm_enter_timewait(cm_id_priv);
3177 cm_event.event = IB_CM_DREQ_ERROR;
3178 break;
3179 case IB_CM_SIDR_REQ_SENT:
3180 cm_id_priv->id.state = IB_CM_IDLE;
3181 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3182 break;
3183 default:
3184 goto discard;
3185 }
3186 spin_unlock_irq(&cm_id_priv->lock);
3187 cm_event.param.send_status = wc_status;
3188
3189 /* No other events can occur on the cm_id at this point. */
3190 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3191 cm_free_msg(msg);
3192 if (ret)
3193 ib_destroy_cm_id(&cm_id_priv->id);
3194 return;
3195 discard:
3196 spin_unlock_irq(&cm_id_priv->lock);
3197 cm_free_msg(msg);
3198 }
3199
3200 static void cm_send_handler(struct ib_mad_agent *mad_agent,
3201 struct ib_mad_send_wc *mad_send_wc)
3202 {
3203 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3204 struct cm_port *port;
3205 u16 attr_index;
3206
3207 port = mad_agent->context;
3208 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3209 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3210
3211 /*
3212 * If the send was in response to a received message (context[0] is not
3213 * set to a cm_id), and is not a REJ, then it is a send that was
3214 * manually retried.
3215 */
3216 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3217 msg->retries = 1;
3218
3219 atomic_long_add(1 + msg->retries,
3220 &port->counter_group[CM_XMIT].counter[attr_index]);
3221 if (msg->retries)
3222 atomic_long_add(msg->retries,
3223 &port->counter_group[CM_XMIT_RETRIES].
3224 counter[attr_index]);
3225
3226 switch (mad_send_wc->status) {
3227 case IB_WC_SUCCESS:
3228 case IB_WC_WR_FLUSH_ERR:
3229 cm_free_msg(msg);
3230 break;
3231 default:
3232 if (msg->context[0] && msg->context[1])
3233 cm_process_send_error(msg, mad_send_wc->status);
3234 else
3235 cm_free_msg(msg);
3236 break;
3237 }
3238 }
3239
3240 static void cm_work_handler(struct work_struct *_work)
3241 {
3242 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3243 int ret;
3244
3245 switch (work->cm_event.event) {
3246 case IB_CM_REQ_RECEIVED:
3247 ret = cm_req_handler(work);
3248 break;
3249 case IB_CM_MRA_RECEIVED:
3250 ret = cm_mra_handler(work);
3251 break;
3252 case IB_CM_REJ_RECEIVED:
3253 ret = cm_rej_handler(work);
3254 break;
3255 case IB_CM_REP_RECEIVED:
3256 ret = cm_rep_handler(work);
3257 break;
3258 case IB_CM_RTU_RECEIVED:
3259 ret = cm_rtu_handler(work);
3260 break;
3261 case IB_CM_USER_ESTABLISHED:
3262 ret = cm_establish_handler(work);
3263 break;
3264 case IB_CM_DREQ_RECEIVED:
3265 ret = cm_dreq_handler(work);
3266 break;
3267 case IB_CM_DREP_RECEIVED:
3268 ret = cm_drep_handler(work);
3269 break;
3270 case IB_CM_SIDR_REQ_RECEIVED:
3271 ret = cm_sidr_req_handler(work);
3272 break;
3273 case IB_CM_SIDR_REP_RECEIVED:
3274 ret = cm_sidr_rep_handler(work);
3275 break;
3276 case IB_CM_LAP_RECEIVED:
3277 ret = cm_lap_handler(work);
3278 break;
3279 case IB_CM_APR_RECEIVED:
3280 ret = cm_apr_handler(work);
3281 break;
3282 case IB_CM_TIMEWAIT_EXIT:
3283 ret = cm_timewait_handler(work);
3284 break;
3285 default:
3286 ret = -EINVAL;
3287 break;
3288 }
3289 if (ret)
3290 cm_free_work(work);
3291 }
3292
3293 static int cm_establish(struct ib_cm_id *cm_id)
3294 {
3295 struct cm_id_private *cm_id_priv;
3296 struct cm_work *work;
3297 unsigned long flags;
3298 int ret = 0;
3299
3300 work = kmalloc(sizeof *work, GFP_ATOMIC);
3301 if (!work)
3302 return -ENOMEM;
3303
3304 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3305 spin_lock_irqsave(&cm_id_priv->lock, flags);
3306 switch (cm_id->state)
3307 {
3308 case IB_CM_REP_SENT:
3309 case IB_CM_MRA_REP_RCVD:
3310 cm_id->state = IB_CM_ESTABLISHED;
3311 break;
3312 case IB_CM_ESTABLISHED:
3313 ret = -EISCONN;
3314 break;
3315 default:
3316 ret = -EINVAL;
3317 break;
3318 }
3319 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3320
3321 if (ret) {
3322 kfree(work);
3323 goto out;
3324 }
3325
3326 /*
3327 * The CM worker thread may try to destroy the cm_id before it
3328 * can execute this work item. To prevent potential deadlock,
3329 * we need to find the cm_id once we're in the context of the
3330 * worker thread, rather than holding a reference on it.
3331 */
3332 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3333 work->local_id = cm_id->local_id;
3334 work->remote_id = cm_id->remote_id;
3335 work->mad_recv_wc = NULL;
3336 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3337 queue_delayed_work(cm.wq, &work->work, 0);
3338 out:
3339 return ret;
3340 }
3341
3342 static int cm_migrate(struct ib_cm_id *cm_id)
3343 {
3344 struct cm_id_private *cm_id_priv;
3345 unsigned long flags;
3346 int ret = 0;
3347
3348 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3349 spin_lock_irqsave(&cm_id_priv->lock, flags);
3350 if (cm_id->state == IB_CM_ESTABLISHED &&
3351 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3352 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3353 cm_id->lap_state = IB_CM_LAP_IDLE;
3354 cm_id_priv->av = cm_id_priv->alt_av;
3355 } else
3356 ret = -EINVAL;
3357 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3358
3359 return ret;
3360 }
3361
3362 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3363 {
3364 int ret;
3365
3366 switch (event) {
3367 case IB_EVENT_COMM_EST:
3368 ret = cm_establish(cm_id);
3369 break;
3370 case IB_EVENT_PATH_MIG:
3371 ret = cm_migrate(cm_id);
3372 break;
3373 default:
3374 ret = -EINVAL;
3375 }
3376 return ret;
3377 }
3378 EXPORT_SYMBOL(ib_cm_notify);
3379
3380 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3381 struct ib_mad_recv_wc *mad_recv_wc)
3382 {
3383 struct cm_port *port = mad_agent->context;
3384 struct cm_work *work;
3385 enum ib_cm_event_type event;
3386 u16 attr_id;
3387 int paths = 0;
3388
3389 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3390 case CM_REQ_ATTR_ID:
3391 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3392 alt_local_lid != 0);
3393 event = IB_CM_REQ_RECEIVED;
3394 break;
3395 case CM_MRA_ATTR_ID:
3396 event = IB_CM_MRA_RECEIVED;
3397 break;
3398 case CM_REJ_ATTR_ID:
3399 event = IB_CM_REJ_RECEIVED;
3400 break;
3401 case CM_REP_ATTR_ID:
3402 event = IB_CM_REP_RECEIVED;
3403 break;
3404 case CM_RTU_ATTR_ID:
3405 event = IB_CM_RTU_RECEIVED;
3406 break;
3407 case CM_DREQ_ATTR_ID:
3408 event = IB_CM_DREQ_RECEIVED;
3409 break;
3410 case CM_DREP_ATTR_ID:
3411 event = IB_CM_DREP_RECEIVED;
3412 break;
3413 case CM_SIDR_REQ_ATTR_ID:
3414 event = IB_CM_SIDR_REQ_RECEIVED;
3415 break;
3416 case CM_SIDR_REP_ATTR_ID:
3417 event = IB_CM_SIDR_REP_RECEIVED;
3418 break;
3419 case CM_LAP_ATTR_ID:
3420 paths = 1;
3421 event = IB_CM_LAP_RECEIVED;
3422 break;
3423 case CM_APR_ATTR_ID:
3424 event = IB_CM_APR_RECEIVED;
3425 break;
3426 default:
3427 ib_free_recv_mad(mad_recv_wc);
3428 return;
3429 }
3430
3431 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
3432 atomic_long_inc(&port->counter_group[CM_RECV].
3433 counter[attr_id - CM_ATTR_ID_OFFSET]);
3434
3435 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3436 GFP_KERNEL);
3437 if (!work) {
3438 ib_free_recv_mad(mad_recv_wc);
3439 return;
3440 }
3441
3442 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3443 work->cm_event.event = event;
3444 work->mad_recv_wc = mad_recv_wc;
3445 work->port = port;
3446 queue_delayed_work(cm.wq, &work->work, 0);
3447 }
3448
3449 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3450 struct ib_qp_attr *qp_attr,
3451 int *qp_attr_mask)
3452 {
3453 unsigned long flags;
3454 int ret;
3455
3456 spin_lock_irqsave(&cm_id_priv->lock, flags);
3457 switch (cm_id_priv->id.state) {
3458 case IB_CM_REQ_SENT:
3459 case IB_CM_MRA_REQ_RCVD:
3460 case IB_CM_REQ_RCVD:
3461 case IB_CM_MRA_REQ_SENT:
3462 case IB_CM_REP_RCVD:
3463 case IB_CM_MRA_REP_SENT:
3464 case IB_CM_REP_SENT:
3465 case IB_CM_MRA_REP_RCVD:
3466 case IB_CM_ESTABLISHED:
3467 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3468 IB_QP_PKEY_INDEX | IB_QP_PORT;
3469 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
3470 if (cm_id_priv->responder_resources)
3471 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3472 IB_ACCESS_REMOTE_ATOMIC;
3473 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3474 qp_attr->port_num = cm_id_priv->av.port->port_num;
3475 ret = 0;
3476 break;
3477 default:
3478 ret = -EINVAL;
3479 break;
3480 }
3481 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3482 return ret;
3483 }
3484
3485 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3486 struct ib_qp_attr *qp_attr,
3487 int *qp_attr_mask)
3488 {
3489 unsigned long flags;
3490 int ret;
3491
3492 spin_lock_irqsave(&cm_id_priv->lock, flags);
3493 switch (cm_id_priv->id.state) {
3494 case IB_CM_REQ_RCVD:
3495 case IB_CM_MRA_REQ_SENT:
3496 case IB_CM_REP_RCVD:
3497 case IB_CM_MRA_REP_SENT:
3498 case IB_CM_REP_SENT:
3499 case IB_CM_MRA_REP_RCVD:
3500 case IB_CM_ESTABLISHED:
3501 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3502 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3503 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3504 qp_attr->path_mtu = cm_id_priv->path_mtu;
3505 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3506 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3507 if (cm_id_priv->qp_type == IB_QPT_RC ||
3508 cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
3509 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3510 IB_QP_MIN_RNR_TIMER;
3511 qp_attr->max_dest_rd_atomic =
3512 cm_id_priv->responder_resources;
3513 qp_attr->min_rnr_timer = 0;
3514 }
3515 if (cm_id_priv->alt_av.ah_attr.dlid) {
3516 *qp_attr_mask |= IB_QP_ALT_PATH;
3517 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3518 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3519 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3520 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3521 }
3522 ret = 0;
3523 break;
3524 default:
3525 ret = -EINVAL;
3526 break;
3527 }
3528 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3529 return ret;
3530 }
3531
3532 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3533 struct ib_qp_attr *qp_attr,
3534 int *qp_attr_mask)
3535 {
3536 unsigned long flags;
3537 int ret;
3538
3539 spin_lock_irqsave(&cm_id_priv->lock, flags);
3540 switch (cm_id_priv->id.state) {
3541 /* Allow transition to RTS before sending REP */
3542 case IB_CM_REQ_RCVD:
3543 case IB_CM_MRA_REQ_SENT:
3544
3545 case IB_CM_REP_RCVD:
3546 case IB_CM_MRA_REP_SENT:
3547 case IB_CM_REP_SENT:
3548 case IB_CM_MRA_REP_RCVD:
3549 case IB_CM_ESTABLISHED:
3550 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
3551 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3552 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3553 switch (cm_id_priv->qp_type) {
3554 case IB_QPT_RC:
3555 case IB_QPT_XRC_INI:
3556 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
3557 IB_QP_MAX_QP_RD_ATOMIC;
3558 qp_attr->retry_cnt = cm_id_priv->retry_count;
3559 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3560 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3561 /* fall through */
3562 case IB_QPT_XRC_TGT:
3563 *qp_attr_mask |= IB_QP_TIMEOUT;
3564 qp_attr->timeout = cm_id_priv->av.timeout;
3565 break;
3566 default:
3567 break;
3568 }
3569 if (cm_id_priv->alt_av.ah_attr.dlid) {
3570 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3571 qp_attr->path_mig_state = IB_MIG_REARM;
3572 }
3573 } else {
3574 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
3575 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3576 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3577 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3578 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3579 qp_attr->path_mig_state = IB_MIG_REARM;
3580 }
3581 ret = 0;
3582 break;
3583 default:
3584 ret = -EINVAL;
3585 break;
3586 }
3587 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3588 return ret;
3589 }
3590
3591 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3592 struct ib_qp_attr *qp_attr,
3593 int *qp_attr_mask)
3594 {
3595 struct cm_id_private *cm_id_priv;
3596 int ret;
3597
3598 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3599 switch (qp_attr->qp_state) {
3600 case IB_QPS_INIT:
3601 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3602 break;
3603 case IB_QPS_RTR:
3604 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3605 break;
3606 case IB_QPS_RTS:
3607 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3608 break;
3609 default:
3610 ret = -EINVAL;
3611 break;
3612 }
3613 return ret;
3614 }
3615 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3616
3617 static void cm_get_ack_delay(struct cm_device *cm_dev)
3618 {
3619 struct ib_device_attr attr;
3620
3621 if (ib_query_device(cm_dev->ib_device, &attr))
3622 cm_dev->ack_delay = 0; /* acks will rely on packet life time */
3623 else
3624 cm_dev->ack_delay = attr.local_ca_ack_delay;
3625 }
3626
3627 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
3628 char *buf)
3629 {
3630 struct cm_counter_group *group;
3631 struct cm_counter_attribute *cm_attr;
3632
3633 group = container_of(obj, struct cm_counter_group, obj);
3634 cm_attr = container_of(attr, struct cm_counter_attribute, attr);
3635
3636 return sprintf(buf, "%ld\n",
3637 atomic_long_read(&group->counter[cm_attr->index]));
3638 }
3639
3640 static const struct sysfs_ops cm_counter_ops = {
3641 .show = cm_show_counter
3642 };
3643
3644 static struct kobj_type cm_counter_obj_type = {
3645 .sysfs_ops = &cm_counter_ops,
3646 .default_attrs = cm_counter_default_attrs
3647 };
3648
3649 static void cm_release_port_obj(struct kobject *obj)
3650 {
3651 struct cm_port *cm_port;
3652
3653 cm_port = container_of(obj, struct cm_port, port_obj);
3654 kfree(cm_port);
3655 }
3656
3657 static struct kobj_type cm_port_obj_type = {
3658 .release = cm_release_port_obj
3659 };
3660
3661 static char *cm_devnode(struct device *dev, mode_t *mode)
3662 {
3663 if (mode)
3664 *mode = 0666;
3665 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
3666 }
3667
3668 struct class cm_class = {
3669 .owner = THIS_MODULE,
3670 .name = "infiniband_cm",
3671 .devnode = cm_devnode,
3672 };
3673 EXPORT_SYMBOL(cm_class);
3674
3675 static int cm_create_port_fs(struct cm_port *port)
3676 {
3677 int i, ret;
3678
3679 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type,
3680 &port->cm_dev->device->kobj,
3681 "%d", port->port_num);
3682 if (ret) {
3683 kfree(port);
3684 return ret;
3685 }
3686
3687 for (i = 0; i < CM_COUNTER_GROUPS; i++) {
3688 ret = kobject_init_and_add(&port->counter_group[i].obj,
3689 &cm_counter_obj_type,
3690 &port->port_obj,
3691 "%s", counter_group_names[i]);
3692 if (ret)
3693 goto error;
3694 }
3695
3696 return 0;
3697
3698 error:
3699 while (i--)
3700 kobject_put(&port->counter_group[i].obj);
3701 kobject_put(&port->port_obj);
3702 return ret;
3703
3704 }
3705
3706 static void cm_remove_port_fs(struct cm_port *port)
3707 {
3708 int i;
3709
3710 for (i = 0; i < CM_COUNTER_GROUPS; i++)
3711 kobject_put(&port->counter_group[i].obj);
3712
3713 kobject_put(&port->port_obj);
3714 }
3715
3716 static void cm_add_one(struct ib_device *ib_device)
3717 {
3718 struct cm_device *cm_dev;
3719 struct cm_port *port;
3720 struct ib_mad_reg_req reg_req = {
3721 .mgmt_class = IB_MGMT_CLASS_CM,
3722 .mgmt_class_version = IB_CM_CLASS_VERSION
3723 };
3724 struct ib_port_modify port_modify = {
3725 .set_port_cap_mask = IB_PORT_CM_SUP
3726 };
3727 unsigned long flags;
3728 int ret;
3729 u8 i;
3730
3731 if (rdma_node_get_transport(ib_device->node_type) != RDMA_TRANSPORT_IB)
3732 return;
3733
3734 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) *
3735 ib_device->phys_port_cnt, GFP_KERNEL);
3736 if (!cm_dev)
3737 return;
3738
3739 cm_dev->ib_device = ib_device;
3740 cm_get_ack_delay(cm_dev);
3741
3742 cm_dev->device = device_create(&cm_class, &ib_device->dev,
3743 MKDEV(0, 0), NULL,
3744 "%s", ib_device->name);
3745 if (IS_ERR(cm_dev->device)) {
3746 kfree(cm_dev);
3747 return;
3748 }
3749
3750 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3751 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3752 port = kzalloc(sizeof *port, GFP_KERNEL);
3753 if (!port)
3754 goto error1;
3755
3756 cm_dev->port[i-1] = port;
3757 port->cm_dev = cm_dev;
3758 port->port_num = i;
3759
3760 ret = cm_create_port_fs(port);
3761 if (ret)
3762 goto error1;
3763
3764 port->mad_agent = ib_register_mad_agent(ib_device, i,
3765 IB_QPT_GSI,
3766 &reg_req,
3767 0,
3768 cm_send_handler,
3769 cm_recv_handler,
3770 port);
3771 if (IS_ERR(port->mad_agent))
3772 goto error2;
3773
3774 ret = ib_modify_port(ib_device, i, 0, &port_modify);
3775 if (ret)
3776 goto error3;
3777 }
3778 ib_set_client_data(ib_device, &cm_client, cm_dev);
3779
3780 write_lock_irqsave(&cm.device_lock, flags);
3781 list_add_tail(&cm_dev->list, &cm.device_list);
3782 write_unlock_irqrestore(&cm.device_lock, flags);
3783 return;
3784
3785 error3:
3786 ib_unregister_mad_agent(port->mad_agent);
3787 error2:
3788 cm_remove_port_fs(port);
3789 error1:
3790 port_modify.set_port_cap_mask = 0;
3791 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3792 while (--i) {
3793 port = cm_dev->port[i-1];
3794 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3795 ib_unregister_mad_agent(port->mad_agent);
3796 cm_remove_port_fs(port);
3797 }
3798 device_unregister(cm_dev->device);
3799 kfree(cm_dev);
3800 }
3801
3802 static void cm_remove_one(struct ib_device *ib_device)
3803 {
3804 struct cm_device *cm_dev;
3805 struct cm_port *port;
3806 struct ib_port_modify port_modify = {
3807 .clr_port_cap_mask = IB_PORT_CM_SUP
3808 };
3809 unsigned long flags;
3810 int i;
3811
3812 cm_dev = ib_get_client_data(ib_device, &cm_client);
3813 if (!cm_dev)
3814 return;
3815
3816 write_lock_irqsave(&cm.device_lock, flags);
3817 list_del(&cm_dev->list);
3818 write_unlock_irqrestore(&cm.device_lock, flags);
3819
3820 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3821 port = cm_dev->port[i-1];
3822 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3823 ib_unregister_mad_agent(port->mad_agent);
3824 flush_workqueue(cm.wq);
3825 cm_remove_port_fs(port);
3826 }
3827 device_unregister(cm_dev->device);
3828 kfree(cm_dev);
3829 }
3830
3831 static int __init ib_cm_init(void)
3832 {
3833 int ret;
3834
3835 memset(&cm, 0, sizeof cm);
3836 INIT_LIST_HEAD(&cm.device_list);
3837 rwlock_init(&cm.device_lock);
3838 spin_lock_init(&cm.lock);
3839 cm.listen_service_table = RB_ROOT;
3840 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3841 cm.remote_id_table = RB_ROOT;
3842 cm.remote_qp_table = RB_ROOT;
3843 cm.remote_sidr_table = RB_ROOT;
3844 idr_init(&cm.local_id_table);
3845 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3846 idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3847 INIT_LIST_HEAD(&cm.timewait_list);
3848
3849 ret = class_register(&cm_class);
3850 if (ret)
3851 return -ENOMEM;
3852
3853 cm.wq = create_workqueue("ib_cm");
3854 if (!cm.wq) {
3855 ret = -ENOMEM;
3856 goto error1;
3857 }
3858
3859 ret = ib_register_client(&cm_client);
3860 if (ret)
3861 goto error2;
3862
3863 return 0;
3864 error2:
3865 destroy_workqueue(cm.wq);
3866 error1:
3867 class_unregister(&cm_class);
3868 return ret;
3869 }
3870
3871 static void __exit ib_cm_cleanup(void)
3872 {
3873 struct cm_timewait_info *timewait_info, *tmp;
3874
3875 spin_lock_irq(&cm.lock);
3876 list_for_each_entry(timewait_info, &cm.timewait_list, list)
3877 cancel_delayed_work(&timewait_info->work.work);
3878 spin_unlock_irq(&cm.lock);
3879
3880 ib_unregister_client(&cm_client);
3881 destroy_workqueue(cm.wq);
3882
3883 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
3884 list_del(&timewait_info->list);
3885 kfree(timewait_info);
3886 }
3887
3888 class_unregister(&cm_class);
3889 idr_destroy(&cm.local_id_table);
3890 }
3891
3892 module_init(ib_cm_init);
3893 module_exit(ib_cm_cleanup);
3894
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