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brcmfmac: remove unnecessary EXPORT_SYMBOL() usage
[deliverable/linux.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/module.h>
40 #include <linux/err.h>
41 #include <linux/idr.h>
42 #include <linux/interrupt.h>
43 #include <linux/random.h>
44 #include <linux/rbtree.h>
45 #include <linux/spinlock.h>
46 #include <linux/slab.h>
47 #include <linux/sysfs.h>
48 #include <linux/workqueue.h>
49 #include <linux/kdev_t.h>
50
51 #include <rdma/ib_cache.h>
52 #include <rdma/ib_cm.h>
53 #include "cm_msgs.h"
54
55 MODULE_AUTHOR("Sean Hefty");
56 MODULE_DESCRIPTION("InfiniBand CM");
57 MODULE_LICENSE("Dual BSD/GPL");
58
59 static void cm_add_one(struct ib_device *device);
60 static void cm_remove_one(struct ib_device *device);
61
62 static struct ib_client cm_client = {
63 .name = "cm",
64 .add = cm_add_one,
65 .remove = cm_remove_one
66 };
67
68 static struct ib_cm {
69 spinlock_t lock;
70 struct list_head device_list;
71 rwlock_t device_lock;
72 struct rb_root listen_service_table;
73 u64 listen_service_id;
74 /* struct rb_root peer_service_table; todo: fix peer to peer */
75 struct rb_root remote_qp_table;
76 struct rb_root remote_id_table;
77 struct rb_root remote_sidr_table;
78 struct idr local_id_table;
79 __be32 random_id_operand;
80 struct list_head timewait_list;
81 struct workqueue_struct *wq;
82 } cm;
83
84 /* Counter indexes ordered by attribute ID */
85 enum {
86 CM_REQ_COUNTER,
87 CM_MRA_COUNTER,
88 CM_REJ_COUNTER,
89 CM_REP_COUNTER,
90 CM_RTU_COUNTER,
91 CM_DREQ_COUNTER,
92 CM_DREP_COUNTER,
93 CM_SIDR_REQ_COUNTER,
94 CM_SIDR_REP_COUNTER,
95 CM_LAP_COUNTER,
96 CM_APR_COUNTER,
97 CM_ATTR_COUNT,
98 CM_ATTR_ID_OFFSET = 0x0010,
99 };
100
101 enum {
102 CM_XMIT,
103 CM_XMIT_RETRIES,
104 CM_RECV,
105 CM_RECV_DUPLICATES,
106 CM_COUNTER_GROUPS
107 };
108
109 static char const counter_group_names[CM_COUNTER_GROUPS]
110 [sizeof("cm_rx_duplicates")] = {
111 "cm_tx_msgs", "cm_tx_retries",
112 "cm_rx_msgs", "cm_rx_duplicates"
113 };
114
115 struct cm_counter_group {
116 struct kobject obj;
117 atomic_long_t counter[CM_ATTR_COUNT];
118 };
119
120 struct cm_counter_attribute {
121 struct attribute attr;
122 int index;
123 };
124
125 #define CM_COUNTER_ATTR(_name, _index) \
126 struct cm_counter_attribute cm_##_name##_counter_attr = { \
127 .attr = { .name = __stringify(_name), .mode = 0444 }, \
128 .index = _index \
129 }
130
131 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
132 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
133 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
134 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
135 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
136 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
137 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
138 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
139 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
140 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
141 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
142
143 static struct attribute *cm_counter_default_attrs[] = {
144 &cm_req_counter_attr.attr,
145 &cm_mra_counter_attr.attr,
146 &cm_rej_counter_attr.attr,
147 &cm_rep_counter_attr.attr,
148 &cm_rtu_counter_attr.attr,
149 &cm_dreq_counter_attr.attr,
150 &cm_drep_counter_attr.attr,
151 &cm_sidr_req_counter_attr.attr,
152 &cm_sidr_rep_counter_attr.attr,
153 &cm_lap_counter_attr.attr,
154 &cm_apr_counter_attr.attr,
155 NULL
156 };
157
158 struct cm_port {
159 struct cm_device *cm_dev;
160 struct ib_mad_agent *mad_agent;
161 struct kobject port_obj;
162 u8 port_num;
163 struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
164 };
165
166 struct cm_device {
167 struct list_head list;
168 struct ib_device *ib_device;
169 struct device *device;
170 u8 ack_delay;
171 struct cm_port *port[0];
172 };
173
174 struct cm_av {
175 struct cm_port *port;
176 union ib_gid dgid;
177 struct ib_ah_attr ah_attr;
178 u16 pkey_index;
179 u8 timeout;
180 };
181
182 struct cm_work {
183 struct delayed_work work;
184 struct list_head list;
185 struct cm_port *port;
186 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
187 __be32 local_id; /* Established / timewait */
188 __be32 remote_id;
189 struct ib_cm_event cm_event;
190 struct ib_sa_path_rec path[0];
191 };
192
193 struct cm_timewait_info {
194 struct cm_work work; /* Must be first. */
195 struct list_head list;
196 struct rb_node remote_qp_node;
197 struct rb_node remote_id_node;
198 __be64 remote_ca_guid;
199 __be32 remote_qpn;
200 u8 inserted_remote_qp;
201 u8 inserted_remote_id;
202 };
203
204 struct cm_id_private {
205 struct ib_cm_id id;
206
207 struct rb_node service_node;
208 struct rb_node sidr_id_node;
209 spinlock_t lock; /* Do not acquire inside cm.lock */
210 struct completion comp;
211 atomic_t refcount;
212
213 struct ib_mad_send_buf *msg;
214 struct cm_timewait_info *timewait_info;
215 /* todo: use alternate port on send failure */
216 struct cm_av av;
217 struct cm_av alt_av;
218 struct ib_cm_compare_data *compare_data;
219
220 void *private_data;
221 __be64 tid;
222 __be32 local_qpn;
223 __be32 remote_qpn;
224 enum ib_qp_type qp_type;
225 __be32 sq_psn;
226 __be32 rq_psn;
227 int timeout_ms;
228 enum ib_mtu path_mtu;
229 __be16 pkey;
230 u8 private_data_len;
231 u8 max_cm_retries;
232 u8 peer_to_peer;
233 u8 responder_resources;
234 u8 initiator_depth;
235 u8 retry_count;
236 u8 rnr_retry_count;
237 u8 service_timeout;
238 u8 target_ack_delay;
239
240 struct list_head work_list;
241 atomic_t work_count;
242 };
243
244 static void cm_work_handler(struct work_struct *work);
245
246 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
247 {
248 if (atomic_dec_and_test(&cm_id_priv->refcount))
249 complete(&cm_id_priv->comp);
250 }
251
252 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
253 struct ib_mad_send_buf **msg)
254 {
255 struct ib_mad_agent *mad_agent;
256 struct ib_mad_send_buf *m;
257 struct ib_ah *ah;
258
259 mad_agent = cm_id_priv->av.port->mad_agent;
260 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
261 if (IS_ERR(ah))
262 return PTR_ERR(ah);
263
264 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
265 cm_id_priv->av.pkey_index,
266 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
267 GFP_ATOMIC);
268 if (IS_ERR(m)) {
269 ib_destroy_ah(ah);
270 return PTR_ERR(m);
271 }
272
273 /* Timeout set by caller if response is expected. */
274 m->ah = ah;
275 m->retries = cm_id_priv->max_cm_retries;
276
277 atomic_inc(&cm_id_priv->refcount);
278 m->context[0] = cm_id_priv;
279 *msg = m;
280 return 0;
281 }
282
283 static int cm_alloc_response_msg(struct cm_port *port,
284 struct ib_mad_recv_wc *mad_recv_wc,
285 struct ib_mad_send_buf **msg)
286 {
287 struct ib_mad_send_buf *m;
288 struct ib_ah *ah;
289
290 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
291 mad_recv_wc->recv_buf.grh, port->port_num);
292 if (IS_ERR(ah))
293 return PTR_ERR(ah);
294
295 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
296 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
297 GFP_ATOMIC);
298 if (IS_ERR(m)) {
299 ib_destroy_ah(ah);
300 return PTR_ERR(m);
301 }
302 m->ah = ah;
303 *msg = m;
304 return 0;
305 }
306
307 static void cm_free_msg(struct ib_mad_send_buf *msg)
308 {
309 ib_destroy_ah(msg->ah);
310 if (msg->context[0])
311 cm_deref_id(msg->context[0]);
312 ib_free_send_mad(msg);
313 }
314
315 static void * cm_copy_private_data(const void *private_data,
316 u8 private_data_len)
317 {
318 void *data;
319
320 if (!private_data || !private_data_len)
321 return NULL;
322
323 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
324 if (!data)
325 return ERR_PTR(-ENOMEM);
326
327 return data;
328 }
329
330 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
331 void *private_data, u8 private_data_len)
332 {
333 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
334 kfree(cm_id_priv->private_data);
335
336 cm_id_priv->private_data = private_data;
337 cm_id_priv->private_data_len = private_data_len;
338 }
339
340 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
341 struct ib_grh *grh, struct cm_av *av)
342 {
343 av->port = port;
344 av->pkey_index = wc->pkey_index;
345 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc,
346 grh, &av->ah_attr);
347 }
348
349 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
350 {
351 struct cm_device *cm_dev;
352 struct cm_port *port = NULL;
353 unsigned long flags;
354 int ret;
355 u8 p;
356
357 read_lock_irqsave(&cm.device_lock, flags);
358 list_for_each_entry(cm_dev, &cm.device_list, list) {
359 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid,
360 &p, NULL)) {
361 port = cm_dev->port[p-1];
362 break;
363 }
364 }
365 read_unlock_irqrestore(&cm.device_lock, flags);
366
367 if (!port)
368 return -EINVAL;
369
370 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
371 be16_to_cpu(path->pkey), &av->pkey_index);
372 if (ret)
373 return ret;
374
375 av->port = port;
376 ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path,
377 &av->ah_attr);
378 av->timeout = path->packet_life_time + 1;
379 return 0;
380 }
381
382 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
383 {
384 unsigned long flags;
385 int id;
386
387 idr_preload(GFP_KERNEL);
388 spin_lock_irqsave(&cm.lock, flags);
389
390 id = idr_alloc_cyclic(&cm.local_id_table, cm_id_priv, 0, 0, GFP_NOWAIT);
391
392 spin_unlock_irqrestore(&cm.lock, flags);
393 idr_preload_end();
394
395 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
396 return id < 0 ? id : 0;
397 }
398
399 static void cm_free_id(__be32 local_id)
400 {
401 spin_lock_irq(&cm.lock);
402 idr_remove(&cm.local_id_table,
403 (__force int) (local_id ^ cm.random_id_operand));
404 spin_unlock_irq(&cm.lock);
405 }
406
407 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
408 {
409 struct cm_id_private *cm_id_priv;
410
411 cm_id_priv = idr_find(&cm.local_id_table,
412 (__force int) (local_id ^ cm.random_id_operand));
413 if (cm_id_priv) {
414 if (cm_id_priv->id.remote_id == remote_id)
415 atomic_inc(&cm_id_priv->refcount);
416 else
417 cm_id_priv = NULL;
418 }
419
420 return cm_id_priv;
421 }
422
423 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
424 {
425 struct cm_id_private *cm_id_priv;
426
427 spin_lock_irq(&cm.lock);
428 cm_id_priv = cm_get_id(local_id, remote_id);
429 spin_unlock_irq(&cm.lock);
430
431 return cm_id_priv;
432 }
433
434 static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
435 {
436 int i;
437
438 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
439 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
440 ((unsigned long *) mask)[i];
441 }
442
443 static int cm_compare_data(struct ib_cm_compare_data *src_data,
444 struct ib_cm_compare_data *dst_data)
445 {
446 u8 src[IB_CM_COMPARE_SIZE];
447 u8 dst[IB_CM_COMPARE_SIZE];
448
449 if (!src_data || !dst_data)
450 return 0;
451
452 cm_mask_copy(src, src_data->data, dst_data->mask);
453 cm_mask_copy(dst, dst_data->data, src_data->mask);
454 return memcmp(src, dst, IB_CM_COMPARE_SIZE);
455 }
456
457 static int cm_compare_private_data(u8 *private_data,
458 struct ib_cm_compare_data *dst_data)
459 {
460 u8 src[IB_CM_COMPARE_SIZE];
461
462 if (!dst_data)
463 return 0;
464
465 cm_mask_copy(src, private_data, dst_data->mask);
466 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
467 }
468
469 /*
470 * Trivial helpers to strip endian annotation and compare; the
471 * endianness doesn't actually matter since we just need a stable
472 * order for the RB tree.
473 */
474 static int be32_lt(__be32 a, __be32 b)
475 {
476 return (__force u32) a < (__force u32) b;
477 }
478
479 static int be32_gt(__be32 a, __be32 b)
480 {
481 return (__force u32) a > (__force u32) b;
482 }
483
484 static int be64_lt(__be64 a, __be64 b)
485 {
486 return (__force u64) a < (__force u64) b;
487 }
488
489 static int be64_gt(__be64 a, __be64 b)
490 {
491 return (__force u64) a > (__force u64) b;
492 }
493
494 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
495 {
496 struct rb_node **link = &cm.listen_service_table.rb_node;
497 struct rb_node *parent = NULL;
498 struct cm_id_private *cur_cm_id_priv;
499 __be64 service_id = cm_id_priv->id.service_id;
500 __be64 service_mask = cm_id_priv->id.service_mask;
501 int data_cmp;
502
503 while (*link) {
504 parent = *link;
505 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
506 service_node);
507 data_cmp = cm_compare_data(cm_id_priv->compare_data,
508 cur_cm_id_priv->compare_data);
509 if ((cur_cm_id_priv->id.service_mask & service_id) ==
510 (service_mask & cur_cm_id_priv->id.service_id) &&
511 (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
512 !data_cmp)
513 return cur_cm_id_priv;
514
515 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
516 link = &(*link)->rb_left;
517 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
518 link = &(*link)->rb_right;
519 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
520 link = &(*link)->rb_left;
521 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
522 link = &(*link)->rb_right;
523 else if (data_cmp < 0)
524 link = &(*link)->rb_left;
525 else
526 link = &(*link)->rb_right;
527 }
528 rb_link_node(&cm_id_priv->service_node, parent, link);
529 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
530 return NULL;
531 }
532
533 static struct cm_id_private * cm_find_listen(struct ib_device *device,
534 __be64 service_id,
535 u8 *private_data)
536 {
537 struct rb_node *node = cm.listen_service_table.rb_node;
538 struct cm_id_private *cm_id_priv;
539 int data_cmp;
540
541 while (node) {
542 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
543 data_cmp = cm_compare_private_data(private_data,
544 cm_id_priv->compare_data);
545 if ((cm_id_priv->id.service_mask & service_id) ==
546 cm_id_priv->id.service_id &&
547 (cm_id_priv->id.device == device) && !data_cmp)
548 return cm_id_priv;
549
550 if (device < cm_id_priv->id.device)
551 node = node->rb_left;
552 else if (device > cm_id_priv->id.device)
553 node = node->rb_right;
554 else if (be64_lt(service_id, cm_id_priv->id.service_id))
555 node = node->rb_left;
556 else if (be64_gt(service_id, cm_id_priv->id.service_id))
557 node = node->rb_right;
558 else if (data_cmp < 0)
559 node = node->rb_left;
560 else
561 node = node->rb_right;
562 }
563 return NULL;
564 }
565
566 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
567 *timewait_info)
568 {
569 struct rb_node **link = &cm.remote_id_table.rb_node;
570 struct rb_node *parent = NULL;
571 struct cm_timewait_info *cur_timewait_info;
572 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
573 __be32 remote_id = timewait_info->work.remote_id;
574
575 while (*link) {
576 parent = *link;
577 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
578 remote_id_node);
579 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
580 link = &(*link)->rb_left;
581 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
582 link = &(*link)->rb_right;
583 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
584 link = &(*link)->rb_left;
585 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
586 link = &(*link)->rb_right;
587 else
588 return cur_timewait_info;
589 }
590 timewait_info->inserted_remote_id = 1;
591 rb_link_node(&timewait_info->remote_id_node, parent, link);
592 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
593 return NULL;
594 }
595
596 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
597 __be32 remote_id)
598 {
599 struct rb_node *node = cm.remote_id_table.rb_node;
600 struct cm_timewait_info *timewait_info;
601
602 while (node) {
603 timewait_info = rb_entry(node, struct cm_timewait_info,
604 remote_id_node);
605 if (be32_lt(remote_id, timewait_info->work.remote_id))
606 node = node->rb_left;
607 else if (be32_gt(remote_id, timewait_info->work.remote_id))
608 node = node->rb_right;
609 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
610 node = node->rb_left;
611 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
612 node = node->rb_right;
613 else
614 return timewait_info;
615 }
616 return NULL;
617 }
618
619 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
620 *timewait_info)
621 {
622 struct rb_node **link = &cm.remote_qp_table.rb_node;
623 struct rb_node *parent = NULL;
624 struct cm_timewait_info *cur_timewait_info;
625 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
626 __be32 remote_qpn = timewait_info->remote_qpn;
627
628 while (*link) {
629 parent = *link;
630 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
631 remote_qp_node);
632 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
633 link = &(*link)->rb_left;
634 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
635 link = &(*link)->rb_right;
636 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
637 link = &(*link)->rb_left;
638 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
639 link = &(*link)->rb_right;
640 else
641 return cur_timewait_info;
642 }
643 timewait_info->inserted_remote_qp = 1;
644 rb_link_node(&timewait_info->remote_qp_node, parent, link);
645 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
646 return NULL;
647 }
648
649 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
650 *cm_id_priv)
651 {
652 struct rb_node **link = &cm.remote_sidr_table.rb_node;
653 struct rb_node *parent = NULL;
654 struct cm_id_private *cur_cm_id_priv;
655 union ib_gid *port_gid = &cm_id_priv->av.dgid;
656 __be32 remote_id = cm_id_priv->id.remote_id;
657
658 while (*link) {
659 parent = *link;
660 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
661 sidr_id_node);
662 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
663 link = &(*link)->rb_left;
664 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
665 link = &(*link)->rb_right;
666 else {
667 int cmp;
668 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
669 sizeof *port_gid);
670 if (cmp < 0)
671 link = &(*link)->rb_left;
672 else if (cmp > 0)
673 link = &(*link)->rb_right;
674 else
675 return cur_cm_id_priv;
676 }
677 }
678 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
679 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
680 return NULL;
681 }
682
683 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
684 enum ib_cm_sidr_status status)
685 {
686 struct ib_cm_sidr_rep_param param;
687
688 memset(&param, 0, sizeof param);
689 param.status = status;
690 ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
691 }
692
693 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
694 ib_cm_handler cm_handler,
695 void *context)
696 {
697 struct cm_id_private *cm_id_priv;
698 int ret;
699
700 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
701 if (!cm_id_priv)
702 return ERR_PTR(-ENOMEM);
703
704 cm_id_priv->id.state = IB_CM_IDLE;
705 cm_id_priv->id.device = device;
706 cm_id_priv->id.cm_handler = cm_handler;
707 cm_id_priv->id.context = context;
708 cm_id_priv->id.remote_cm_qpn = 1;
709 ret = cm_alloc_id(cm_id_priv);
710 if (ret)
711 goto error;
712
713 spin_lock_init(&cm_id_priv->lock);
714 init_completion(&cm_id_priv->comp);
715 INIT_LIST_HEAD(&cm_id_priv->work_list);
716 atomic_set(&cm_id_priv->work_count, -1);
717 atomic_set(&cm_id_priv->refcount, 1);
718 return &cm_id_priv->id;
719
720 error:
721 kfree(cm_id_priv);
722 return ERR_PTR(-ENOMEM);
723 }
724 EXPORT_SYMBOL(ib_create_cm_id);
725
726 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
727 {
728 struct cm_work *work;
729
730 if (list_empty(&cm_id_priv->work_list))
731 return NULL;
732
733 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
734 list_del(&work->list);
735 return work;
736 }
737
738 static void cm_free_work(struct cm_work *work)
739 {
740 if (work->mad_recv_wc)
741 ib_free_recv_mad(work->mad_recv_wc);
742 kfree(work);
743 }
744
745 static inline int cm_convert_to_ms(int iba_time)
746 {
747 /* approximate conversion to ms from 4.096us x 2^iba_time */
748 return 1 << max(iba_time - 8, 0);
749 }
750
751 /*
752 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
753 * Because of how ack_timeout is stored, adding one doubles the timeout.
754 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
755 * increment it (round up) only if the other is within 50%.
756 */
757 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
758 {
759 int ack_timeout = packet_life_time + 1;
760
761 if (ack_timeout >= ca_ack_delay)
762 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
763 else
764 ack_timeout = ca_ack_delay +
765 (ack_timeout >= (ca_ack_delay - 1));
766
767 return min(31, ack_timeout);
768 }
769
770 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
771 {
772 if (timewait_info->inserted_remote_id) {
773 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
774 timewait_info->inserted_remote_id = 0;
775 }
776
777 if (timewait_info->inserted_remote_qp) {
778 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
779 timewait_info->inserted_remote_qp = 0;
780 }
781 }
782
783 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
784 {
785 struct cm_timewait_info *timewait_info;
786
787 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
788 if (!timewait_info)
789 return ERR_PTR(-ENOMEM);
790
791 timewait_info->work.local_id = local_id;
792 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
793 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
794 return timewait_info;
795 }
796
797 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
798 {
799 int wait_time;
800 unsigned long flags;
801
802 spin_lock_irqsave(&cm.lock, flags);
803 cm_cleanup_timewait(cm_id_priv->timewait_info);
804 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
805 spin_unlock_irqrestore(&cm.lock, flags);
806
807 /*
808 * The cm_id could be destroyed by the user before we exit timewait.
809 * To protect against this, we search for the cm_id after exiting
810 * timewait before notifying the user that we've exited timewait.
811 */
812 cm_id_priv->id.state = IB_CM_TIMEWAIT;
813 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
814 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
815 msecs_to_jiffies(wait_time));
816 cm_id_priv->timewait_info = NULL;
817 }
818
819 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
820 {
821 unsigned long flags;
822
823 cm_id_priv->id.state = IB_CM_IDLE;
824 if (cm_id_priv->timewait_info) {
825 spin_lock_irqsave(&cm.lock, flags);
826 cm_cleanup_timewait(cm_id_priv->timewait_info);
827 spin_unlock_irqrestore(&cm.lock, flags);
828 kfree(cm_id_priv->timewait_info);
829 cm_id_priv->timewait_info = NULL;
830 }
831 }
832
833 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
834 {
835 struct cm_id_private *cm_id_priv;
836 struct cm_work *work;
837
838 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
839 retest:
840 spin_lock_irq(&cm_id_priv->lock);
841 switch (cm_id->state) {
842 case IB_CM_LISTEN:
843 cm_id->state = IB_CM_IDLE;
844 spin_unlock_irq(&cm_id_priv->lock);
845 spin_lock_irq(&cm.lock);
846 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
847 spin_unlock_irq(&cm.lock);
848 break;
849 case IB_CM_SIDR_REQ_SENT:
850 cm_id->state = IB_CM_IDLE;
851 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
852 spin_unlock_irq(&cm_id_priv->lock);
853 break;
854 case IB_CM_SIDR_REQ_RCVD:
855 spin_unlock_irq(&cm_id_priv->lock);
856 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
857 break;
858 case IB_CM_REQ_SENT:
859 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
860 spin_unlock_irq(&cm_id_priv->lock);
861 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
862 &cm_id_priv->id.device->node_guid,
863 sizeof cm_id_priv->id.device->node_guid,
864 NULL, 0);
865 break;
866 case IB_CM_REQ_RCVD:
867 if (err == -ENOMEM) {
868 /* Do not reject to allow future retries. */
869 cm_reset_to_idle(cm_id_priv);
870 spin_unlock_irq(&cm_id_priv->lock);
871 } else {
872 spin_unlock_irq(&cm_id_priv->lock);
873 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
874 NULL, 0, NULL, 0);
875 }
876 break;
877 case IB_CM_MRA_REQ_RCVD:
878 case IB_CM_REP_SENT:
879 case IB_CM_MRA_REP_RCVD:
880 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
881 /* Fall through */
882 case IB_CM_MRA_REQ_SENT:
883 case IB_CM_REP_RCVD:
884 case IB_CM_MRA_REP_SENT:
885 spin_unlock_irq(&cm_id_priv->lock);
886 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
887 NULL, 0, NULL, 0);
888 break;
889 case IB_CM_ESTABLISHED:
890 spin_unlock_irq(&cm_id_priv->lock);
891 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT)
892 break;
893 ib_send_cm_dreq(cm_id, NULL, 0);
894 goto retest;
895 case IB_CM_DREQ_SENT:
896 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
897 cm_enter_timewait(cm_id_priv);
898 spin_unlock_irq(&cm_id_priv->lock);
899 break;
900 case IB_CM_DREQ_RCVD:
901 spin_unlock_irq(&cm_id_priv->lock);
902 ib_send_cm_drep(cm_id, NULL, 0);
903 break;
904 default:
905 spin_unlock_irq(&cm_id_priv->lock);
906 break;
907 }
908
909 cm_free_id(cm_id->local_id);
910 cm_deref_id(cm_id_priv);
911 wait_for_completion(&cm_id_priv->comp);
912 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
913 cm_free_work(work);
914 kfree(cm_id_priv->compare_data);
915 kfree(cm_id_priv->private_data);
916 kfree(cm_id_priv);
917 }
918
919 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
920 {
921 cm_destroy_id(cm_id, 0);
922 }
923 EXPORT_SYMBOL(ib_destroy_cm_id);
924
925 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
926 struct ib_cm_compare_data *compare_data)
927 {
928 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
929 unsigned long flags;
930 int ret = 0;
931
932 service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
933 service_id &= service_mask;
934 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
935 (service_id != IB_CM_ASSIGN_SERVICE_ID))
936 return -EINVAL;
937
938 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
939 if (cm_id->state != IB_CM_IDLE)
940 return -EINVAL;
941
942 if (compare_data) {
943 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
944 GFP_KERNEL);
945 if (!cm_id_priv->compare_data)
946 return -ENOMEM;
947 cm_mask_copy(cm_id_priv->compare_data->data,
948 compare_data->data, compare_data->mask);
949 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
950 IB_CM_COMPARE_SIZE);
951 }
952
953 cm_id->state = IB_CM_LISTEN;
954
955 spin_lock_irqsave(&cm.lock, flags);
956 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
957 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
958 cm_id->service_mask = ~cpu_to_be64(0);
959 } else {
960 cm_id->service_id = service_id;
961 cm_id->service_mask = service_mask;
962 }
963 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
964 spin_unlock_irqrestore(&cm.lock, flags);
965
966 if (cur_cm_id_priv) {
967 cm_id->state = IB_CM_IDLE;
968 kfree(cm_id_priv->compare_data);
969 cm_id_priv->compare_data = NULL;
970 ret = -EBUSY;
971 }
972 return ret;
973 }
974 EXPORT_SYMBOL(ib_cm_listen);
975
976 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
977 enum cm_msg_sequence msg_seq)
978 {
979 u64 hi_tid, low_tid;
980
981 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
982 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
983 (msg_seq << 30));
984 return cpu_to_be64(hi_tid | low_tid);
985 }
986
987 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
988 __be16 attr_id, __be64 tid)
989 {
990 hdr->base_version = IB_MGMT_BASE_VERSION;
991 hdr->mgmt_class = IB_MGMT_CLASS_CM;
992 hdr->class_version = IB_CM_CLASS_VERSION;
993 hdr->method = IB_MGMT_METHOD_SEND;
994 hdr->attr_id = attr_id;
995 hdr->tid = tid;
996 }
997
998 static void cm_format_req(struct cm_req_msg *req_msg,
999 struct cm_id_private *cm_id_priv,
1000 struct ib_cm_req_param *param)
1001 {
1002 struct ib_sa_path_rec *pri_path = param->primary_path;
1003 struct ib_sa_path_rec *alt_path = param->alternate_path;
1004
1005 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1006 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
1007
1008 req_msg->local_comm_id = cm_id_priv->id.local_id;
1009 req_msg->service_id = param->service_id;
1010 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1011 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
1012 cm_req_set_init_depth(req_msg, param->initiator_depth);
1013 cm_req_set_remote_resp_timeout(req_msg,
1014 param->remote_cm_response_timeout);
1015 cm_req_set_qp_type(req_msg, param->qp_type);
1016 cm_req_set_flow_ctrl(req_msg, param->flow_control);
1017 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
1018 cm_req_set_local_resp_timeout(req_msg,
1019 param->local_cm_response_timeout);
1020 req_msg->pkey = param->primary_path->pkey;
1021 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
1022 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
1023
1024 if (param->qp_type != IB_QPT_XRC_INI) {
1025 cm_req_set_resp_res(req_msg, param->responder_resources);
1026 cm_req_set_retry_count(req_msg, param->retry_count);
1027 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
1028 cm_req_set_srq(req_msg, param->srq);
1029 }
1030
1031 if (pri_path->hop_limit <= 1) {
1032 req_msg->primary_local_lid = pri_path->slid;
1033 req_msg->primary_remote_lid = pri_path->dlid;
1034 } else {
1035 /* Work-around until there's a way to obtain remote LID info */
1036 req_msg->primary_local_lid = IB_LID_PERMISSIVE;
1037 req_msg->primary_remote_lid = IB_LID_PERMISSIVE;
1038 }
1039 req_msg->primary_local_gid = pri_path->sgid;
1040 req_msg->primary_remote_gid = pri_path->dgid;
1041 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label);
1042 cm_req_set_primary_packet_rate(req_msg, pri_path->rate);
1043 req_msg->primary_traffic_class = pri_path->traffic_class;
1044 req_msg->primary_hop_limit = pri_path->hop_limit;
1045 cm_req_set_primary_sl(req_msg, pri_path->sl);
1046 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1));
1047 cm_req_set_primary_local_ack_timeout(req_msg,
1048 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1049 pri_path->packet_life_time));
1050
1051 if (alt_path) {
1052 if (alt_path->hop_limit <= 1) {
1053 req_msg->alt_local_lid = alt_path->slid;
1054 req_msg->alt_remote_lid = alt_path->dlid;
1055 } else {
1056 req_msg->alt_local_lid = IB_LID_PERMISSIVE;
1057 req_msg->alt_remote_lid = IB_LID_PERMISSIVE;
1058 }
1059 req_msg->alt_local_gid = alt_path->sgid;
1060 req_msg->alt_remote_gid = alt_path->dgid;
1061 cm_req_set_alt_flow_label(req_msg,
1062 alt_path->flow_label);
1063 cm_req_set_alt_packet_rate(req_msg, alt_path->rate);
1064 req_msg->alt_traffic_class = alt_path->traffic_class;
1065 req_msg->alt_hop_limit = alt_path->hop_limit;
1066 cm_req_set_alt_sl(req_msg, alt_path->sl);
1067 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1));
1068 cm_req_set_alt_local_ack_timeout(req_msg,
1069 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1070 alt_path->packet_life_time));
1071 }
1072
1073 if (param->private_data && param->private_data_len)
1074 memcpy(req_msg->private_data, param->private_data,
1075 param->private_data_len);
1076 }
1077
1078 static int cm_validate_req_param(struct ib_cm_req_param *param)
1079 {
1080 /* peer-to-peer not supported */
1081 if (param->peer_to_peer)
1082 return -EINVAL;
1083
1084 if (!param->primary_path)
1085 return -EINVAL;
1086
1087 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1088 param->qp_type != IB_QPT_XRC_INI)
1089 return -EINVAL;
1090
1091 if (param->private_data &&
1092 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1093 return -EINVAL;
1094
1095 if (param->alternate_path &&
1096 (param->alternate_path->pkey != param->primary_path->pkey ||
1097 param->alternate_path->mtu != param->primary_path->mtu))
1098 return -EINVAL;
1099
1100 return 0;
1101 }
1102
1103 int ib_send_cm_req(struct ib_cm_id *cm_id,
1104 struct ib_cm_req_param *param)
1105 {
1106 struct cm_id_private *cm_id_priv;
1107 struct cm_req_msg *req_msg;
1108 unsigned long flags;
1109 int ret;
1110
1111 ret = cm_validate_req_param(param);
1112 if (ret)
1113 return ret;
1114
1115 /* Verify that we're not in timewait. */
1116 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1117 spin_lock_irqsave(&cm_id_priv->lock, flags);
1118 if (cm_id->state != IB_CM_IDLE) {
1119 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1120 ret = -EINVAL;
1121 goto out;
1122 }
1123 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1124
1125 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1126 id.local_id);
1127 if (IS_ERR(cm_id_priv->timewait_info)) {
1128 ret = PTR_ERR(cm_id_priv->timewait_info);
1129 goto out;
1130 }
1131
1132 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
1133 if (ret)
1134 goto error1;
1135 if (param->alternate_path) {
1136 ret = cm_init_av_by_path(param->alternate_path,
1137 &cm_id_priv->alt_av);
1138 if (ret)
1139 goto error1;
1140 }
1141 cm_id->service_id = param->service_id;
1142 cm_id->service_mask = ~cpu_to_be64(0);
1143 cm_id_priv->timeout_ms = cm_convert_to_ms(
1144 param->primary_path->packet_life_time) * 2 +
1145 cm_convert_to_ms(
1146 param->remote_cm_response_timeout);
1147 cm_id_priv->max_cm_retries = param->max_cm_retries;
1148 cm_id_priv->initiator_depth = param->initiator_depth;
1149 cm_id_priv->responder_resources = param->responder_resources;
1150 cm_id_priv->retry_count = param->retry_count;
1151 cm_id_priv->path_mtu = param->primary_path->mtu;
1152 cm_id_priv->pkey = param->primary_path->pkey;
1153 cm_id_priv->qp_type = param->qp_type;
1154
1155 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1156 if (ret)
1157 goto error1;
1158
1159 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1160 cm_format_req(req_msg, cm_id_priv, param);
1161 cm_id_priv->tid = req_msg->hdr.tid;
1162 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1163 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1164
1165 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1166 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1167
1168 spin_lock_irqsave(&cm_id_priv->lock, flags);
1169 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1170 if (ret) {
1171 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1172 goto error2;
1173 }
1174 BUG_ON(cm_id->state != IB_CM_IDLE);
1175 cm_id->state = IB_CM_REQ_SENT;
1176 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1177 return 0;
1178
1179 error2: cm_free_msg(cm_id_priv->msg);
1180 error1: kfree(cm_id_priv->timewait_info);
1181 out: return ret;
1182 }
1183 EXPORT_SYMBOL(ib_send_cm_req);
1184
1185 static int cm_issue_rej(struct cm_port *port,
1186 struct ib_mad_recv_wc *mad_recv_wc,
1187 enum ib_cm_rej_reason reason,
1188 enum cm_msg_response msg_rejected,
1189 void *ari, u8 ari_length)
1190 {
1191 struct ib_mad_send_buf *msg = NULL;
1192 struct cm_rej_msg *rej_msg, *rcv_msg;
1193 int ret;
1194
1195 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1196 if (ret)
1197 return ret;
1198
1199 /* We just need common CM header information. Cast to any message. */
1200 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1201 rej_msg = (struct cm_rej_msg *) msg->mad;
1202
1203 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1204 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1205 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1206 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1207 rej_msg->reason = cpu_to_be16(reason);
1208
1209 if (ari && ari_length) {
1210 cm_rej_set_reject_info_len(rej_msg, ari_length);
1211 memcpy(rej_msg->ari, ari, ari_length);
1212 }
1213
1214 ret = ib_post_send_mad(msg, NULL);
1215 if (ret)
1216 cm_free_msg(msg);
1217
1218 return ret;
1219 }
1220
1221 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1222 __be32 local_qpn, __be32 remote_qpn)
1223 {
1224 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1225 ((local_ca_guid == remote_ca_guid) &&
1226 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1227 }
1228
1229 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1230 struct ib_sa_path_rec *primary_path,
1231 struct ib_sa_path_rec *alt_path)
1232 {
1233 memset(primary_path, 0, sizeof *primary_path);
1234 primary_path->dgid = req_msg->primary_local_gid;
1235 primary_path->sgid = req_msg->primary_remote_gid;
1236 primary_path->dlid = req_msg->primary_local_lid;
1237 primary_path->slid = req_msg->primary_remote_lid;
1238 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1239 primary_path->hop_limit = req_msg->primary_hop_limit;
1240 primary_path->traffic_class = req_msg->primary_traffic_class;
1241 primary_path->reversible = 1;
1242 primary_path->pkey = req_msg->pkey;
1243 primary_path->sl = cm_req_get_primary_sl(req_msg);
1244 primary_path->mtu_selector = IB_SA_EQ;
1245 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1246 primary_path->rate_selector = IB_SA_EQ;
1247 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1248 primary_path->packet_life_time_selector = IB_SA_EQ;
1249 primary_path->packet_life_time =
1250 cm_req_get_primary_local_ack_timeout(req_msg);
1251 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1252
1253 if (req_msg->alt_local_lid) {
1254 memset(alt_path, 0, sizeof *alt_path);
1255 alt_path->dgid = req_msg->alt_local_gid;
1256 alt_path->sgid = req_msg->alt_remote_gid;
1257 alt_path->dlid = req_msg->alt_local_lid;
1258 alt_path->slid = req_msg->alt_remote_lid;
1259 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1260 alt_path->hop_limit = req_msg->alt_hop_limit;
1261 alt_path->traffic_class = req_msg->alt_traffic_class;
1262 alt_path->reversible = 1;
1263 alt_path->pkey = req_msg->pkey;
1264 alt_path->sl = cm_req_get_alt_sl(req_msg);
1265 alt_path->mtu_selector = IB_SA_EQ;
1266 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1267 alt_path->rate_selector = IB_SA_EQ;
1268 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1269 alt_path->packet_life_time_selector = IB_SA_EQ;
1270 alt_path->packet_life_time =
1271 cm_req_get_alt_local_ack_timeout(req_msg);
1272 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1273 }
1274 }
1275
1276 static void cm_format_req_event(struct cm_work *work,
1277 struct cm_id_private *cm_id_priv,
1278 struct ib_cm_id *listen_id)
1279 {
1280 struct cm_req_msg *req_msg;
1281 struct ib_cm_req_event_param *param;
1282
1283 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1284 param = &work->cm_event.param.req_rcvd;
1285 param->listen_id = listen_id;
1286 param->port = cm_id_priv->av.port->port_num;
1287 param->primary_path = &work->path[0];
1288 if (req_msg->alt_local_lid)
1289 param->alternate_path = &work->path[1];
1290 else
1291 param->alternate_path = NULL;
1292 param->remote_ca_guid = req_msg->local_ca_guid;
1293 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1294 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1295 param->qp_type = cm_req_get_qp_type(req_msg);
1296 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1297 param->responder_resources = cm_req_get_init_depth(req_msg);
1298 param->initiator_depth = cm_req_get_resp_res(req_msg);
1299 param->local_cm_response_timeout =
1300 cm_req_get_remote_resp_timeout(req_msg);
1301 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1302 param->remote_cm_response_timeout =
1303 cm_req_get_local_resp_timeout(req_msg);
1304 param->retry_count = cm_req_get_retry_count(req_msg);
1305 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1306 param->srq = cm_req_get_srq(req_msg);
1307 work->cm_event.private_data = &req_msg->private_data;
1308 }
1309
1310 static void cm_process_work(struct cm_id_private *cm_id_priv,
1311 struct cm_work *work)
1312 {
1313 int ret;
1314
1315 /* We will typically only have the current event to report. */
1316 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1317 cm_free_work(work);
1318
1319 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1320 spin_lock_irq(&cm_id_priv->lock);
1321 work = cm_dequeue_work(cm_id_priv);
1322 spin_unlock_irq(&cm_id_priv->lock);
1323 BUG_ON(!work);
1324 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1325 &work->cm_event);
1326 cm_free_work(work);
1327 }
1328 cm_deref_id(cm_id_priv);
1329 if (ret)
1330 cm_destroy_id(&cm_id_priv->id, ret);
1331 }
1332
1333 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1334 struct cm_id_private *cm_id_priv,
1335 enum cm_msg_response msg_mraed, u8 service_timeout,
1336 const void *private_data, u8 private_data_len)
1337 {
1338 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1339 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1340 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1341 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1342 cm_mra_set_service_timeout(mra_msg, service_timeout);
1343
1344 if (private_data && private_data_len)
1345 memcpy(mra_msg->private_data, private_data, private_data_len);
1346 }
1347
1348 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1349 struct cm_id_private *cm_id_priv,
1350 enum ib_cm_rej_reason reason,
1351 void *ari,
1352 u8 ari_length,
1353 const void *private_data,
1354 u8 private_data_len)
1355 {
1356 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1357 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1358
1359 switch(cm_id_priv->id.state) {
1360 case IB_CM_REQ_RCVD:
1361 rej_msg->local_comm_id = 0;
1362 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1363 break;
1364 case IB_CM_MRA_REQ_SENT:
1365 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1366 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1367 break;
1368 case IB_CM_REP_RCVD:
1369 case IB_CM_MRA_REP_SENT:
1370 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1371 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1372 break;
1373 default:
1374 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1375 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1376 break;
1377 }
1378
1379 rej_msg->reason = cpu_to_be16(reason);
1380 if (ari && ari_length) {
1381 cm_rej_set_reject_info_len(rej_msg, ari_length);
1382 memcpy(rej_msg->ari, ari, ari_length);
1383 }
1384
1385 if (private_data && private_data_len)
1386 memcpy(rej_msg->private_data, private_data, private_data_len);
1387 }
1388
1389 static void cm_dup_req_handler(struct cm_work *work,
1390 struct cm_id_private *cm_id_priv)
1391 {
1392 struct ib_mad_send_buf *msg = NULL;
1393 int ret;
1394
1395 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1396 counter[CM_REQ_COUNTER]);
1397
1398 /* Quick state check to discard duplicate REQs. */
1399 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1400 return;
1401
1402 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1403 if (ret)
1404 return;
1405
1406 spin_lock_irq(&cm_id_priv->lock);
1407 switch (cm_id_priv->id.state) {
1408 case IB_CM_MRA_REQ_SENT:
1409 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1410 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1411 cm_id_priv->private_data,
1412 cm_id_priv->private_data_len);
1413 break;
1414 case IB_CM_TIMEWAIT:
1415 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1416 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1417 break;
1418 default:
1419 goto unlock;
1420 }
1421 spin_unlock_irq(&cm_id_priv->lock);
1422
1423 ret = ib_post_send_mad(msg, NULL);
1424 if (ret)
1425 goto free;
1426 return;
1427
1428 unlock: spin_unlock_irq(&cm_id_priv->lock);
1429 free: cm_free_msg(msg);
1430 }
1431
1432 static struct cm_id_private * cm_match_req(struct cm_work *work,
1433 struct cm_id_private *cm_id_priv)
1434 {
1435 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1436 struct cm_timewait_info *timewait_info;
1437 struct cm_req_msg *req_msg;
1438
1439 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1440
1441 /* Check for possible duplicate REQ. */
1442 spin_lock_irq(&cm.lock);
1443 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1444 if (timewait_info) {
1445 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1446 timewait_info->work.remote_id);
1447 spin_unlock_irq(&cm.lock);
1448 if (cur_cm_id_priv) {
1449 cm_dup_req_handler(work, cur_cm_id_priv);
1450 cm_deref_id(cur_cm_id_priv);
1451 }
1452 return NULL;
1453 }
1454
1455 /* Check for stale connections. */
1456 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1457 if (timewait_info) {
1458 cm_cleanup_timewait(cm_id_priv->timewait_info);
1459 spin_unlock_irq(&cm.lock);
1460 cm_issue_rej(work->port, work->mad_recv_wc,
1461 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1462 NULL, 0);
1463 return NULL;
1464 }
1465
1466 /* Find matching listen request. */
1467 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1468 req_msg->service_id,
1469 req_msg->private_data);
1470 if (!listen_cm_id_priv) {
1471 cm_cleanup_timewait(cm_id_priv->timewait_info);
1472 spin_unlock_irq(&cm.lock);
1473 cm_issue_rej(work->port, work->mad_recv_wc,
1474 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1475 NULL, 0);
1476 goto out;
1477 }
1478 atomic_inc(&listen_cm_id_priv->refcount);
1479 atomic_inc(&cm_id_priv->refcount);
1480 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1481 atomic_inc(&cm_id_priv->work_count);
1482 spin_unlock_irq(&cm.lock);
1483 out:
1484 return listen_cm_id_priv;
1485 }
1486
1487 /*
1488 * Work-around for inter-subnet connections. If the LIDs are permissive,
1489 * we need to override the LID/SL data in the REQ with the LID information
1490 * in the work completion.
1491 */
1492 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
1493 {
1494 if (!cm_req_get_primary_subnet_local(req_msg)) {
1495 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) {
1496 req_msg->primary_local_lid = cpu_to_be16(wc->slid);
1497 cm_req_set_primary_sl(req_msg, wc->sl);
1498 }
1499
1500 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE)
1501 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1502 }
1503
1504 if (!cm_req_get_alt_subnet_local(req_msg)) {
1505 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) {
1506 req_msg->alt_local_lid = cpu_to_be16(wc->slid);
1507 cm_req_set_alt_sl(req_msg, wc->sl);
1508 }
1509
1510 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE)
1511 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1512 }
1513 }
1514
1515 static int cm_req_handler(struct cm_work *work)
1516 {
1517 struct ib_cm_id *cm_id;
1518 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1519 struct cm_req_msg *req_msg;
1520 int ret;
1521
1522 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1523
1524 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
1525 if (IS_ERR(cm_id))
1526 return PTR_ERR(cm_id);
1527
1528 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1529 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1530 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1531 work->mad_recv_wc->recv_buf.grh,
1532 &cm_id_priv->av);
1533 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1534 id.local_id);
1535 if (IS_ERR(cm_id_priv->timewait_info)) {
1536 ret = PTR_ERR(cm_id_priv->timewait_info);
1537 goto destroy;
1538 }
1539 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1540 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1541 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1542
1543 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1544 if (!listen_cm_id_priv) {
1545 ret = -EINVAL;
1546 kfree(cm_id_priv->timewait_info);
1547 goto destroy;
1548 }
1549
1550 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1551 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1552 cm_id_priv->id.service_id = req_msg->service_id;
1553 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1554
1555 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
1556 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1557 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1558 if (ret) {
1559 ib_get_cached_gid(work->port->cm_dev->ib_device,
1560 work->port->port_num, 0, &work->path[0].sgid);
1561 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1562 &work->path[0].sgid, sizeof work->path[0].sgid,
1563 NULL, 0);
1564 goto rejected;
1565 }
1566 if (req_msg->alt_local_lid) {
1567 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1568 if (ret) {
1569 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1570 &work->path[0].sgid,
1571 sizeof work->path[0].sgid, NULL, 0);
1572 goto rejected;
1573 }
1574 }
1575 cm_id_priv->tid = req_msg->hdr.tid;
1576 cm_id_priv->timeout_ms = cm_convert_to_ms(
1577 cm_req_get_local_resp_timeout(req_msg));
1578 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1579 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1580 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1581 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1582 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1583 cm_id_priv->pkey = req_msg->pkey;
1584 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1585 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1586 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1587 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1588
1589 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1590 cm_process_work(cm_id_priv, work);
1591 cm_deref_id(listen_cm_id_priv);
1592 return 0;
1593
1594 rejected:
1595 atomic_dec(&cm_id_priv->refcount);
1596 cm_deref_id(listen_cm_id_priv);
1597 destroy:
1598 ib_destroy_cm_id(cm_id);
1599 return ret;
1600 }
1601
1602 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1603 struct cm_id_private *cm_id_priv,
1604 struct ib_cm_rep_param *param)
1605 {
1606 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1607 rep_msg->local_comm_id = cm_id_priv->id.local_id;
1608 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1609 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1610 rep_msg->resp_resources = param->responder_resources;
1611 cm_rep_set_target_ack_delay(rep_msg,
1612 cm_id_priv->av.port->cm_dev->ack_delay);
1613 cm_rep_set_failover(rep_msg, param->failover_accepted);
1614 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1615 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1616
1617 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
1618 rep_msg->initiator_depth = param->initiator_depth;
1619 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1620 cm_rep_set_srq(rep_msg, param->srq);
1621 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1622 } else {
1623 cm_rep_set_srq(rep_msg, 1);
1624 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num));
1625 }
1626
1627 if (param->private_data && param->private_data_len)
1628 memcpy(rep_msg->private_data, param->private_data,
1629 param->private_data_len);
1630 }
1631
1632 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1633 struct ib_cm_rep_param *param)
1634 {
1635 struct cm_id_private *cm_id_priv;
1636 struct ib_mad_send_buf *msg;
1637 struct cm_rep_msg *rep_msg;
1638 unsigned long flags;
1639 int ret;
1640
1641 if (param->private_data &&
1642 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1643 return -EINVAL;
1644
1645 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1646 spin_lock_irqsave(&cm_id_priv->lock, flags);
1647 if (cm_id->state != IB_CM_REQ_RCVD &&
1648 cm_id->state != IB_CM_MRA_REQ_SENT) {
1649 ret = -EINVAL;
1650 goto out;
1651 }
1652
1653 ret = cm_alloc_msg(cm_id_priv, &msg);
1654 if (ret)
1655 goto out;
1656
1657 rep_msg = (struct cm_rep_msg *) msg->mad;
1658 cm_format_rep(rep_msg, cm_id_priv, param);
1659 msg->timeout_ms = cm_id_priv->timeout_ms;
1660 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1661
1662 ret = ib_post_send_mad(msg, NULL);
1663 if (ret) {
1664 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1665 cm_free_msg(msg);
1666 return ret;
1667 }
1668
1669 cm_id->state = IB_CM_REP_SENT;
1670 cm_id_priv->msg = msg;
1671 cm_id_priv->initiator_depth = param->initiator_depth;
1672 cm_id_priv->responder_resources = param->responder_resources;
1673 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1674 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
1675
1676 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1677 return ret;
1678 }
1679 EXPORT_SYMBOL(ib_send_cm_rep);
1680
1681 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1682 struct cm_id_private *cm_id_priv,
1683 const void *private_data,
1684 u8 private_data_len)
1685 {
1686 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1687 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1688 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1689
1690 if (private_data && private_data_len)
1691 memcpy(rtu_msg->private_data, private_data, private_data_len);
1692 }
1693
1694 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1695 const void *private_data,
1696 u8 private_data_len)
1697 {
1698 struct cm_id_private *cm_id_priv;
1699 struct ib_mad_send_buf *msg;
1700 unsigned long flags;
1701 void *data;
1702 int ret;
1703
1704 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1705 return -EINVAL;
1706
1707 data = cm_copy_private_data(private_data, private_data_len);
1708 if (IS_ERR(data))
1709 return PTR_ERR(data);
1710
1711 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1712 spin_lock_irqsave(&cm_id_priv->lock, flags);
1713 if (cm_id->state != IB_CM_REP_RCVD &&
1714 cm_id->state != IB_CM_MRA_REP_SENT) {
1715 ret = -EINVAL;
1716 goto error;
1717 }
1718
1719 ret = cm_alloc_msg(cm_id_priv, &msg);
1720 if (ret)
1721 goto error;
1722
1723 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1724 private_data, private_data_len);
1725
1726 ret = ib_post_send_mad(msg, NULL);
1727 if (ret) {
1728 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1729 cm_free_msg(msg);
1730 kfree(data);
1731 return ret;
1732 }
1733
1734 cm_id->state = IB_CM_ESTABLISHED;
1735 cm_set_private_data(cm_id_priv, data, private_data_len);
1736 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1737 return 0;
1738
1739 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1740 kfree(data);
1741 return ret;
1742 }
1743 EXPORT_SYMBOL(ib_send_cm_rtu);
1744
1745 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
1746 {
1747 struct cm_rep_msg *rep_msg;
1748 struct ib_cm_rep_event_param *param;
1749
1750 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1751 param = &work->cm_event.param.rep_rcvd;
1752 param->remote_ca_guid = rep_msg->local_ca_guid;
1753 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1754 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
1755 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1756 param->responder_resources = rep_msg->initiator_depth;
1757 param->initiator_depth = rep_msg->resp_resources;
1758 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1759 param->failover_accepted = cm_rep_get_failover(rep_msg);
1760 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1761 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1762 param->srq = cm_rep_get_srq(rep_msg);
1763 work->cm_event.private_data = &rep_msg->private_data;
1764 }
1765
1766 static void cm_dup_rep_handler(struct cm_work *work)
1767 {
1768 struct cm_id_private *cm_id_priv;
1769 struct cm_rep_msg *rep_msg;
1770 struct ib_mad_send_buf *msg = NULL;
1771 int ret;
1772
1773 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1774 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1775 rep_msg->local_comm_id);
1776 if (!cm_id_priv)
1777 return;
1778
1779 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1780 counter[CM_REP_COUNTER]);
1781 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1782 if (ret)
1783 goto deref;
1784
1785 spin_lock_irq(&cm_id_priv->lock);
1786 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1787 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1788 cm_id_priv->private_data,
1789 cm_id_priv->private_data_len);
1790 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1791 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1792 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1793 cm_id_priv->private_data,
1794 cm_id_priv->private_data_len);
1795 else
1796 goto unlock;
1797 spin_unlock_irq(&cm_id_priv->lock);
1798
1799 ret = ib_post_send_mad(msg, NULL);
1800 if (ret)
1801 goto free;
1802 goto deref;
1803
1804 unlock: spin_unlock_irq(&cm_id_priv->lock);
1805 free: cm_free_msg(msg);
1806 deref: cm_deref_id(cm_id_priv);
1807 }
1808
1809 static int cm_rep_handler(struct cm_work *work)
1810 {
1811 struct cm_id_private *cm_id_priv;
1812 struct cm_rep_msg *rep_msg;
1813 int ret;
1814
1815 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1816 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1817 if (!cm_id_priv) {
1818 cm_dup_rep_handler(work);
1819 return -EINVAL;
1820 }
1821
1822 cm_format_rep_event(work, cm_id_priv->qp_type);
1823
1824 spin_lock_irq(&cm_id_priv->lock);
1825 switch (cm_id_priv->id.state) {
1826 case IB_CM_REQ_SENT:
1827 case IB_CM_MRA_REQ_RCVD:
1828 break;
1829 default:
1830 spin_unlock_irq(&cm_id_priv->lock);
1831 ret = -EINVAL;
1832 goto error;
1833 }
1834
1835 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1836 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1837 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
1838
1839 spin_lock(&cm.lock);
1840 /* Check for duplicate REP. */
1841 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1842 spin_unlock(&cm.lock);
1843 spin_unlock_irq(&cm_id_priv->lock);
1844 ret = -EINVAL;
1845 goto error;
1846 }
1847 /* Check for a stale connection. */
1848 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1849 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1850 &cm.remote_id_table);
1851 cm_id_priv->timewait_info->inserted_remote_id = 0;
1852 spin_unlock(&cm.lock);
1853 spin_unlock_irq(&cm_id_priv->lock);
1854 cm_issue_rej(work->port, work->mad_recv_wc,
1855 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1856 NULL, 0);
1857 ret = -EINVAL;
1858 goto error;
1859 }
1860 spin_unlock(&cm.lock);
1861
1862 cm_id_priv->id.state = IB_CM_REP_RCVD;
1863 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1864 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
1865 cm_id_priv->initiator_depth = rep_msg->resp_resources;
1866 cm_id_priv->responder_resources = rep_msg->initiator_depth;
1867 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1868 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1869 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1870 cm_id_priv->av.timeout =
1871 cm_ack_timeout(cm_id_priv->target_ack_delay,
1872 cm_id_priv->av.timeout - 1);
1873 cm_id_priv->alt_av.timeout =
1874 cm_ack_timeout(cm_id_priv->target_ack_delay,
1875 cm_id_priv->alt_av.timeout - 1);
1876
1877 /* todo: handle peer_to_peer */
1878
1879 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1880 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1881 if (!ret)
1882 list_add_tail(&work->list, &cm_id_priv->work_list);
1883 spin_unlock_irq(&cm_id_priv->lock);
1884
1885 if (ret)
1886 cm_process_work(cm_id_priv, work);
1887 else
1888 cm_deref_id(cm_id_priv);
1889 return 0;
1890
1891 error:
1892 cm_deref_id(cm_id_priv);
1893 return ret;
1894 }
1895
1896 static int cm_establish_handler(struct cm_work *work)
1897 {
1898 struct cm_id_private *cm_id_priv;
1899 int ret;
1900
1901 /* See comment in cm_establish about lookup. */
1902 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1903 if (!cm_id_priv)
1904 return -EINVAL;
1905
1906 spin_lock_irq(&cm_id_priv->lock);
1907 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1908 spin_unlock_irq(&cm_id_priv->lock);
1909 goto out;
1910 }
1911
1912 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1913 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1914 if (!ret)
1915 list_add_tail(&work->list, &cm_id_priv->work_list);
1916 spin_unlock_irq(&cm_id_priv->lock);
1917
1918 if (ret)
1919 cm_process_work(cm_id_priv, work);
1920 else
1921 cm_deref_id(cm_id_priv);
1922 return 0;
1923 out:
1924 cm_deref_id(cm_id_priv);
1925 return -EINVAL;
1926 }
1927
1928 static int cm_rtu_handler(struct cm_work *work)
1929 {
1930 struct cm_id_private *cm_id_priv;
1931 struct cm_rtu_msg *rtu_msg;
1932 int ret;
1933
1934 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1935 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1936 rtu_msg->local_comm_id);
1937 if (!cm_id_priv)
1938 return -EINVAL;
1939
1940 work->cm_event.private_data = &rtu_msg->private_data;
1941
1942 spin_lock_irq(&cm_id_priv->lock);
1943 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1944 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1945 spin_unlock_irq(&cm_id_priv->lock);
1946 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1947 counter[CM_RTU_COUNTER]);
1948 goto out;
1949 }
1950 cm_id_priv->id.state = IB_CM_ESTABLISHED;
1951
1952 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1953 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1954 if (!ret)
1955 list_add_tail(&work->list, &cm_id_priv->work_list);
1956 spin_unlock_irq(&cm_id_priv->lock);
1957
1958 if (ret)
1959 cm_process_work(cm_id_priv, work);
1960 else
1961 cm_deref_id(cm_id_priv);
1962 return 0;
1963 out:
1964 cm_deref_id(cm_id_priv);
1965 return -EINVAL;
1966 }
1967
1968 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1969 struct cm_id_private *cm_id_priv,
1970 const void *private_data,
1971 u8 private_data_len)
1972 {
1973 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1974 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1975 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1976 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1977 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1978
1979 if (private_data && private_data_len)
1980 memcpy(dreq_msg->private_data, private_data, private_data_len);
1981 }
1982
1983 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1984 const void *private_data,
1985 u8 private_data_len)
1986 {
1987 struct cm_id_private *cm_id_priv;
1988 struct ib_mad_send_buf *msg;
1989 unsigned long flags;
1990 int ret;
1991
1992 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1993 return -EINVAL;
1994
1995 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1996 spin_lock_irqsave(&cm_id_priv->lock, flags);
1997 if (cm_id->state != IB_CM_ESTABLISHED) {
1998 ret = -EINVAL;
1999 goto out;
2000 }
2001
2002 if (cm_id->lap_state == IB_CM_LAP_SENT ||
2003 cm_id->lap_state == IB_CM_MRA_LAP_RCVD)
2004 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2005
2006 ret = cm_alloc_msg(cm_id_priv, &msg);
2007 if (ret) {
2008 cm_enter_timewait(cm_id_priv);
2009 goto out;
2010 }
2011
2012 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2013 private_data, private_data_len);
2014 msg->timeout_ms = cm_id_priv->timeout_ms;
2015 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2016
2017 ret = ib_post_send_mad(msg, NULL);
2018 if (ret) {
2019 cm_enter_timewait(cm_id_priv);
2020 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2021 cm_free_msg(msg);
2022 return ret;
2023 }
2024
2025 cm_id->state = IB_CM_DREQ_SENT;
2026 cm_id_priv->msg = msg;
2027 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2028 return ret;
2029 }
2030 EXPORT_SYMBOL(ib_send_cm_dreq);
2031
2032 static void cm_format_drep(struct cm_drep_msg *drep_msg,
2033 struct cm_id_private *cm_id_priv,
2034 const void *private_data,
2035 u8 private_data_len)
2036 {
2037 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2038 drep_msg->local_comm_id = cm_id_priv->id.local_id;
2039 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2040
2041 if (private_data && private_data_len)
2042 memcpy(drep_msg->private_data, private_data, private_data_len);
2043 }
2044
2045 int ib_send_cm_drep(struct ib_cm_id *cm_id,
2046 const void *private_data,
2047 u8 private_data_len)
2048 {
2049 struct cm_id_private *cm_id_priv;
2050 struct ib_mad_send_buf *msg;
2051 unsigned long flags;
2052 void *data;
2053 int ret;
2054
2055 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2056 return -EINVAL;
2057
2058 data = cm_copy_private_data(private_data, private_data_len);
2059 if (IS_ERR(data))
2060 return PTR_ERR(data);
2061
2062 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2063 spin_lock_irqsave(&cm_id_priv->lock, flags);
2064 if (cm_id->state != IB_CM_DREQ_RCVD) {
2065 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2066 kfree(data);
2067 return -EINVAL;
2068 }
2069
2070 cm_set_private_data(cm_id_priv, data, private_data_len);
2071 cm_enter_timewait(cm_id_priv);
2072
2073 ret = cm_alloc_msg(cm_id_priv, &msg);
2074 if (ret)
2075 goto out;
2076
2077 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2078 private_data, private_data_len);
2079
2080 ret = ib_post_send_mad(msg, NULL);
2081 if (ret) {
2082 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2083 cm_free_msg(msg);
2084 return ret;
2085 }
2086
2087 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2088 return ret;
2089 }
2090 EXPORT_SYMBOL(ib_send_cm_drep);
2091
2092 static int cm_issue_drep(struct cm_port *port,
2093 struct ib_mad_recv_wc *mad_recv_wc)
2094 {
2095 struct ib_mad_send_buf *msg = NULL;
2096 struct cm_dreq_msg *dreq_msg;
2097 struct cm_drep_msg *drep_msg;
2098 int ret;
2099
2100 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2101 if (ret)
2102 return ret;
2103
2104 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2105 drep_msg = (struct cm_drep_msg *) msg->mad;
2106
2107 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2108 drep_msg->remote_comm_id = dreq_msg->local_comm_id;
2109 drep_msg->local_comm_id = dreq_msg->remote_comm_id;
2110
2111 ret = ib_post_send_mad(msg, NULL);
2112 if (ret)
2113 cm_free_msg(msg);
2114
2115 return ret;
2116 }
2117
2118 static int cm_dreq_handler(struct cm_work *work)
2119 {
2120 struct cm_id_private *cm_id_priv;
2121 struct cm_dreq_msg *dreq_msg;
2122 struct ib_mad_send_buf *msg = NULL;
2123 int ret;
2124
2125 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2126 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
2127 dreq_msg->local_comm_id);
2128 if (!cm_id_priv) {
2129 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2130 counter[CM_DREQ_COUNTER]);
2131 cm_issue_drep(work->port, work->mad_recv_wc);
2132 return -EINVAL;
2133 }
2134
2135 work->cm_event.private_data = &dreq_msg->private_data;
2136
2137 spin_lock_irq(&cm_id_priv->lock);
2138 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
2139 goto unlock;
2140
2141 switch (cm_id_priv->id.state) {
2142 case IB_CM_REP_SENT:
2143 case IB_CM_DREQ_SENT:
2144 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2145 break;
2146 case IB_CM_ESTABLISHED:
2147 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2148 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2149 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2150 break;
2151 case IB_CM_MRA_REP_RCVD:
2152 break;
2153 case IB_CM_TIMEWAIT:
2154 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2155 counter[CM_DREQ_COUNTER]);
2156 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2157 goto unlock;
2158
2159 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2160 cm_id_priv->private_data,
2161 cm_id_priv->private_data_len);
2162 spin_unlock_irq(&cm_id_priv->lock);
2163
2164 if (ib_post_send_mad(msg, NULL))
2165 cm_free_msg(msg);
2166 goto deref;
2167 case IB_CM_DREQ_RCVD:
2168 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2169 counter[CM_DREQ_COUNTER]);
2170 goto unlock;
2171 default:
2172 goto unlock;
2173 }
2174 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2175 cm_id_priv->tid = dreq_msg->hdr.tid;
2176 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2177 if (!ret)
2178 list_add_tail(&work->list, &cm_id_priv->work_list);
2179 spin_unlock_irq(&cm_id_priv->lock);
2180
2181 if (ret)
2182 cm_process_work(cm_id_priv, work);
2183 else
2184 cm_deref_id(cm_id_priv);
2185 return 0;
2186
2187 unlock: spin_unlock_irq(&cm_id_priv->lock);
2188 deref: cm_deref_id(cm_id_priv);
2189 return -EINVAL;
2190 }
2191
2192 static int cm_drep_handler(struct cm_work *work)
2193 {
2194 struct cm_id_private *cm_id_priv;
2195 struct cm_drep_msg *drep_msg;
2196 int ret;
2197
2198 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2199 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2200 drep_msg->local_comm_id);
2201 if (!cm_id_priv)
2202 return -EINVAL;
2203
2204 work->cm_event.private_data = &drep_msg->private_data;
2205
2206 spin_lock_irq(&cm_id_priv->lock);
2207 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2208 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2209 spin_unlock_irq(&cm_id_priv->lock);
2210 goto out;
2211 }
2212 cm_enter_timewait(cm_id_priv);
2213
2214 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2215 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2216 if (!ret)
2217 list_add_tail(&work->list, &cm_id_priv->work_list);
2218 spin_unlock_irq(&cm_id_priv->lock);
2219
2220 if (ret)
2221 cm_process_work(cm_id_priv, work);
2222 else
2223 cm_deref_id(cm_id_priv);
2224 return 0;
2225 out:
2226 cm_deref_id(cm_id_priv);
2227 return -EINVAL;
2228 }
2229
2230 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2231 enum ib_cm_rej_reason reason,
2232 void *ari,
2233 u8 ari_length,
2234 const void *private_data,
2235 u8 private_data_len)
2236 {
2237 struct cm_id_private *cm_id_priv;
2238 struct ib_mad_send_buf *msg;
2239 unsigned long flags;
2240 int ret;
2241
2242 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2243 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2244 return -EINVAL;
2245
2246 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2247
2248 spin_lock_irqsave(&cm_id_priv->lock, flags);
2249 switch (cm_id->state) {
2250 case IB_CM_REQ_SENT:
2251 case IB_CM_MRA_REQ_RCVD:
2252 case IB_CM_REQ_RCVD:
2253 case IB_CM_MRA_REQ_SENT:
2254 case IB_CM_REP_RCVD:
2255 case IB_CM_MRA_REP_SENT:
2256 ret = cm_alloc_msg(cm_id_priv, &msg);
2257 if (!ret)
2258 cm_format_rej((struct cm_rej_msg *) msg->mad,
2259 cm_id_priv, reason, ari, ari_length,
2260 private_data, private_data_len);
2261
2262 cm_reset_to_idle(cm_id_priv);
2263 break;
2264 case IB_CM_REP_SENT:
2265 case IB_CM_MRA_REP_RCVD:
2266 ret = cm_alloc_msg(cm_id_priv, &msg);
2267 if (!ret)
2268 cm_format_rej((struct cm_rej_msg *) msg->mad,
2269 cm_id_priv, reason, ari, ari_length,
2270 private_data, private_data_len);
2271
2272 cm_enter_timewait(cm_id_priv);
2273 break;
2274 default:
2275 ret = -EINVAL;
2276 goto out;
2277 }
2278
2279 if (ret)
2280 goto out;
2281
2282 ret = ib_post_send_mad(msg, NULL);
2283 if (ret)
2284 cm_free_msg(msg);
2285
2286 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2287 return ret;
2288 }
2289 EXPORT_SYMBOL(ib_send_cm_rej);
2290
2291 static void cm_format_rej_event(struct cm_work *work)
2292 {
2293 struct cm_rej_msg *rej_msg;
2294 struct ib_cm_rej_event_param *param;
2295
2296 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2297 param = &work->cm_event.param.rej_rcvd;
2298 param->ari = rej_msg->ari;
2299 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2300 param->reason = __be16_to_cpu(rej_msg->reason);
2301 work->cm_event.private_data = &rej_msg->private_data;
2302 }
2303
2304 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2305 {
2306 struct cm_timewait_info *timewait_info;
2307 struct cm_id_private *cm_id_priv;
2308 __be32 remote_id;
2309
2310 remote_id = rej_msg->local_comm_id;
2311
2312 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2313 spin_lock_irq(&cm.lock);
2314 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2315 remote_id);
2316 if (!timewait_info) {
2317 spin_unlock_irq(&cm.lock);
2318 return NULL;
2319 }
2320 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2321 (timewait_info->work.local_id ^
2322 cm.random_id_operand));
2323 if (cm_id_priv) {
2324 if (cm_id_priv->id.remote_id == remote_id)
2325 atomic_inc(&cm_id_priv->refcount);
2326 else
2327 cm_id_priv = NULL;
2328 }
2329 spin_unlock_irq(&cm.lock);
2330 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2331 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2332 else
2333 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2334
2335 return cm_id_priv;
2336 }
2337
2338 static int cm_rej_handler(struct cm_work *work)
2339 {
2340 struct cm_id_private *cm_id_priv;
2341 struct cm_rej_msg *rej_msg;
2342 int ret;
2343
2344 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2345 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2346 if (!cm_id_priv)
2347 return -EINVAL;
2348
2349 cm_format_rej_event(work);
2350
2351 spin_lock_irq(&cm_id_priv->lock);
2352 switch (cm_id_priv->id.state) {
2353 case IB_CM_REQ_SENT:
2354 case IB_CM_MRA_REQ_RCVD:
2355 case IB_CM_REP_SENT:
2356 case IB_CM_MRA_REP_RCVD:
2357 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2358 /* fall through */
2359 case IB_CM_REQ_RCVD:
2360 case IB_CM_MRA_REQ_SENT:
2361 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2362 cm_enter_timewait(cm_id_priv);
2363 else
2364 cm_reset_to_idle(cm_id_priv);
2365 break;
2366 case IB_CM_DREQ_SENT:
2367 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2368 /* fall through */
2369 case IB_CM_REP_RCVD:
2370 case IB_CM_MRA_REP_SENT:
2371 cm_enter_timewait(cm_id_priv);
2372 break;
2373 case IB_CM_ESTABLISHED:
2374 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
2375 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
2376 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
2377 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2378 cm_id_priv->msg);
2379 cm_enter_timewait(cm_id_priv);
2380 break;
2381 }
2382 /* fall through */
2383 default:
2384 spin_unlock_irq(&cm_id_priv->lock);
2385 ret = -EINVAL;
2386 goto out;
2387 }
2388
2389 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2390 if (!ret)
2391 list_add_tail(&work->list, &cm_id_priv->work_list);
2392 spin_unlock_irq(&cm_id_priv->lock);
2393
2394 if (ret)
2395 cm_process_work(cm_id_priv, work);
2396 else
2397 cm_deref_id(cm_id_priv);
2398 return 0;
2399 out:
2400 cm_deref_id(cm_id_priv);
2401 return -EINVAL;
2402 }
2403
2404 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2405 u8 service_timeout,
2406 const void *private_data,
2407 u8 private_data_len)
2408 {
2409 struct cm_id_private *cm_id_priv;
2410 struct ib_mad_send_buf *msg;
2411 enum ib_cm_state cm_state;
2412 enum ib_cm_lap_state lap_state;
2413 enum cm_msg_response msg_response;
2414 void *data;
2415 unsigned long flags;
2416 int ret;
2417
2418 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2419 return -EINVAL;
2420
2421 data = cm_copy_private_data(private_data, private_data_len);
2422 if (IS_ERR(data))
2423 return PTR_ERR(data);
2424
2425 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2426
2427 spin_lock_irqsave(&cm_id_priv->lock, flags);
2428 switch(cm_id_priv->id.state) {
2429 case IB_CM_REQ_RCVD:
2430 cm_state = IB_CM_MRA_REQ_SENT;
2431 lap_state = cm_id->lap_state;
2432 msg_response = CM_MSG_RESPONSE_REQ;
2433 break;
2434 case IB_CM_REP_RCVD:
2435 cm_state = IB_CM_MRA_REP_SENT;
2436 lap_state = cm_id->lap_state;
2437 msg_response = CM_MSG_RESPONSE_REP;
2438 break;
2439 case IB_CM_ESTABLISHED:
2440 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
2441 cm_state = cm_id->state;
2442 lap_state = IB_CM_MRA_LAP_SENT;
2443 msg_response = CM_MSG_RESPONSE_OTHER;
2444 break;
2445 }
2446 default:
2447 ret = -EINVAL;
2448 goto error1;
2449 }
2450
2451 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
2452 ret = cm_alloc_msg(cm_id_priv, &msg);
2453 if (ret)
2454 goto error1;
2455
2456 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2457 msg_response, service_timeout,
2458 private_data, private_data_len);
2459 ret = ib_post_send_mad(msg, NULL);
2460 if (ret)
2461 goto error2;
2462 }
2463
2464 cm_id->state = cm_state;
2465 cm_id->lap_state = lap_state;
2466 cm_id_priv->service_timeout = service_timeout;
2467 cm_set_private_data(cm_id_priv, data, private_data_len);
2468 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2469 return 0;
2470
2471 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2472 kfree(data);
2473 return ret;
2474
2475 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2476 kfree(data);
2477 cm_free_msg(msg);
2478 return ret;
2479 }
2480 EXPORT_SYMBOL(ib_send_cm_mra);
2481
2482 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2483 {
2484 switch (cm_mra_get_msg_mraed(mra_msg)) {
2485 case CM_MSG_RESPONSE_REQ:
2486 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2487 case CM_MSG_RESPONSE_REP:
2488 case CM_MSG_RESPONSE_OTHER:
2489 return cm_acquire_id(mra_msg->remote_comm_id,
2490 mra_msg->local_comm_id);
2491 default:
2492 return NULL;
2493 }
2494 }
2495
2496 static int cm_mra_handler(struct cm_work *work)
2497 {
2498 struct cm_id_private *cm_id_priv;
2499 struct cm_mra_msg *mra_msg;
2500 int timeout, ret;
2501
2502 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2503 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2504 if (!cm_id_priv)
2505 return -EINVAL;
2506
2507 work->cm_event.private_data = &mra_msg->private_data;
2508 work->cm_event.param.mra_rcvd.service_timeout =
2509 cm_mra_get_service_timeout(mra_msg);
2510 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2511 cm_convert_to_ms(cm_id_priv->av.timeout);
2512
2513 spin_lock_irq(&cm_id_priv->lock);
2514 switch (cm_id_priv->id.state) {
2515 case IB_CM_REQ_SENT:
2516 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2517 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2518 cm_id_priv->msg, timeout))
2519 goto out;
2520 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2521 break;
2522 case IB_CM_REP_SENT:
2523 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2524 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2525 cm_id_priv->msg, timeout))
2526 goto out;
2527 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2528 break;
2529 case IB_CM_ESTABLISHED:
2530 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2531 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2532 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2533 cm_id_priv->msg, timeout)) {
2534 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2535 atomic_long_inc(&work->port->
2536 counter_group[CM_RECV_DUPLICATES].
2537 counter[CM_MRA_COUNTER]);
2538 goto out;
2539 }
2540 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2541 break;
2542 case IB_CM_MRA_REQ_RCVD:
2543 case IB_CM_MRA_REP_RCVD:
2544 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2545 counter[CM_MRA_COUNTER]);
2546 /* fall through */
2547 default:
2548 goto out;
2549 }
2550
2551 cm_id_priv->msg->context[1] = (void *) (unsigned long)
2552 cm_id_priv->id.state;
2553 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2554 if (!ret)
2555 list_add_tail(&work->list, &cm_id_priv->work_list);
2556 spin_unlock_irq(&cm_id_priv->lock);
2557
2558 if (ret)
2559 cm_process_work(cm_id_priv, work);
2560 else
2561 cm_deref_id(cm_id_priv);
2562 return 0;
2563 out:
2564 spin_unlock_irq(&cm_id_priv->lock);
2565 cm_deref_id(cm_id_priv);
2566 return -EINVAL;
2567 }
2568
2569 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2570 struct cm_id_private *cm_id_priv,
2571 struct ib_sa_path_rec *alternate_path,
2572 const void *private_data,
2573 u8 private_data_len)
2574 {
2575 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2576 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2577 lap_msg->local_comm_id = cm_id_priv->id.local_id;
2578 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2579 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2580 /* todo: need remote CM response timeout */
2581 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2582 lap_msg->alt_local_lid = alternate_path->slid;
2583 lap_msg->alt_remote_lid = alternate_path->dlid;
2584 lap_msg->alt_local_gid = alternate_path->sgid;
2585 lap_msg->alt_remote_gid = alternate_path->dgid;
2586 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2587 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2588 lap_msg->alt_hop_limit = alternate_path->hop_limit;
2589 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2590 cm_lap_set_sl(lap_msg, alternate_path->sl);
2591 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2592 cm_lap_set_local_ack_timeout(lap_msg,
2593 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
2594 alternate_path->packet_life_time));
2595
2596 if (private_data && private_data_len)
2597 memcpy(lap_msg->private_data, private_data, private_data_len);
2598 }
2599
2600 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2601 struct ib_sa_path_rec *alternate_path,
2602 const void *private_data,
2603 u8 private_data_len)
2604 {
2605 struct cm_id_private *cm_id_priv;
2606 struct ib_mad_send_buf *msg;
2607 unsigned long flags;
2608 int ret;
2609
2610 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2611 return -EINVAL;
2612
2613 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2614 spin_lock_irqsave(&cm_id_priv->lock, flags);
2615 if (cm_id->state != IB_CM_ESTABLISHED ||
2616 (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2617 cm_id->lap_state != IB_CM_LAP_IDLE)) {
2618 ret = -EINVAL;
2619 goto out;
2620 }
2621
2622 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
2623 if (ret)
2624 goto out;
2625 cm_id_priv->alt_av.timeout =
2626 cm_ack_timeout(cm_id_priv->target_ack_delay,
2627 cm_id_priv->alt_av.timeout - 1);
2628
2629 ret = cm_alloc_msg(cm_id_priv, &msg);
2630 if (ret)
2631 goto out;
2632
2633 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2634 alternate_path, private_data, private_data_len);
2635 msg->timeout_ms = cm_id_priv->timeout_ms;
2636 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2637
2638 ret = ib_post_send_mad(msg, NULL);
2639 if (ret) {
2640 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2641 cm_free_msg(msg);
2642 return ret;
2643 }
2644
2645 cm_id->lap_state = IB_CM_LAP_SENT;
2646 cm_id_priv->msg = msg;
2647
2648 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2649 return ret;
2650 }
2651 EXPORT_SYMBOL(ib_send_cm_lap);
2652
2653 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2654 struct ib_sa_path_rec *path,
2655 struct cm_lap_msg *lap_msg)
2656 {
2657 memset(path, 0, sizeof *path);
2658 path->dgid = lap_msg->alt_local_gid;
2659 path->sgid = lap_msg->alt_remote_gid;
2660 path->dlid = lap_msg->alt_local_lid;
2661 path->slid = lap_msg->alt_remote_lid;
2662 path->flow_label = cm_lap_get_flow_label(lap_msg);
2663 path->hop_limit = lap_msg->alt_hop_limit;
2664 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2665 path->reversible = 1;
2666 path->pkey = cm_id_priv->pkey;
2667 path->sl = cm_lap_get_sl(lap_msg);
2668 path->mtu_selector = IB_SA_EQ;
2669 path->mtu = cm_id_priv->path_mtu;
2670 path->rate_selector = IB_SA_EQ;
2671 path->rate = cm_lap_get_packet_rate(lap_msg);
2672 path->packet_life_time_selector = IB_SA_EQ;
2673 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2674 path->packet_life_time -= (path->packet_life_time > 0);
2675 }
2676
2677 static int cm_lap_handler(struct cm_work *work)
2678 {
2679 struct cm_id_private *cm_id_priv;
2680 struct cm_lap_msg *lap_msg;
2681 struct ib_cm_lap_event_param *param;
2682 struct ib_mad_send_buf *msg = NULL;
2683 int ret;
2684
2685 /* todo: verify LAP request and send reject APR if invalid. */
2686 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2687 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2688 lap_msg->local_comm_id);
2689 if (!cm_id_priv)
2690 return -EINVAL;
2691
2692 param = &work->cm_event.param.lap_rcvd;
2693 param->alternate_path = &work->path[0];
2694 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
2695 work->cm_event.private_data = &lap_msg->private_data;
2696
2697 spin_lock_irq(&cm_id_priv->lock);
2698 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2699 goto unlock;
2700
2701 switch (cm_id_priv->id.lap_state) {
2702 case IB_CM_LAP_UNINIT:
2703 case IB_CM_LAP_IDLE:
2704 break;
2705 case IB_CM_MRA_LAP_SENT:
2706 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2707 counter[CM_LAP_COUNTER]);
2708 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2709 goto unlock;
2710
2711 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2712 CM_MSG_RESPONSE_OTHER,
2713 cm_id_priv->service_timeout,
2714 cm_id_priv->private_data,
2715 cm_id_priv->private_data_len);
2716 spin_unlock_irq(&cm_id_priv->lock);
2717
2718 if (ib_post_send_mad(msg, NULL))
2719 cm_free_msg(msg);
2720 goto deref;
2721 case IB_CM_LAP_RCVD:
2722 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2723 counter[CM_LAP_COUNTER]);
2724 goto unlock;
2725 default:
2726 goto unlock;
2727 }
2728
2729 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2730 cm_id_priv->tid = lap_msg->hdr.tid;
2731 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2732 work->mad_recv_wc->recv_buf.grh,
2733 &cm_id_priv->av);
2734 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
2735 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2736 if (!ret)
2737 list_add_tail(&work->list, &cm_id_priv->work_list);
2738 spin_unlock_irq(&cm_id_priv->lock);
2739
2740 if (ret)
2741 cm_process_work(cm_id_priv, work);
2742 else
2743 cm_deref_id(cm_id_priv);
2744 return 0;
2745
2746 unlock: spin_unlock_irq(&cm_id_priv->lock);
2747 deref: cm_deref_id(cm_id_priv);
2748 return -EINVAL;
2749 }
2750
2751 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2752 struct cm_id_private *cm_id_priv,
2753 enum ib_cm_apr_status status,
2754 void *info,
2755 u8 info_length,
2756 const void *private_data,
2757 u8 private_data_len)
2758 {
2759 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2760 apr_msg->local_comm_id = cm_id_priv->id.local_id;
2761 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2762 apr_msg->ap_status = (u8) status;
2763
2764 if (info && info_length) {
2765 apr_msg->info_length = info_length;
2766 memcpy(apr_msg->info, info, info_length);
2767 }
2768
2769 if (private_data && private_data_len)
2770 memcpy(apr_msg->private_data, private_data, private_data_len);
2771 }
2772
2773 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2774 enum ib_cm_apr_status status,
2775 void *info,
2776 u8 info_length,
2777 const void *private_data,
2778 u8 private_data_len)
2779 {
2780 struct cm_id_private *cm_id_priv;
2781 struct ib_mad_send_buf *msg;
2782 unsigned long flags;
2783 int ret;
2784
2785 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2786 (info && info_length > IB_CM_APR_INFO_LENGTH))
2787 return -EINVAL;
2788
2789 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2790 spin_lock_irqsave(&cm_id_priv->lock, flags);
2791 if (cm_id->state != IB_CM_ESTABLISHED ||
2792 (cm_id->lap_state != IB_CM_LAP_RCVD &&
2793 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2794 ret = -EINVAL;
2795 goto out;
2796 }
2797
2798 ret = cm_alloc_msg(cm_id_priv, &msg);
2799 if (ret)
2800 goto out;
2801
2802 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2803 info, info_length, private_data, private_data_len);
2804 ret = ib_post_send_mad(msg, NULL);
2805 if (ret) {
2806 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2807 cm_free_msg(msg);
2808 return ret;
2809 }
2810
2811 cm_id->lap_state = IB_CM_LAP_IDLE;
2812 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2813 return ret;
2814 }
2815 EXPORT_SYMBOL(ib_send_cm_apr);
2816
2817 static int cm_apr_handler(struct cm_work *work)
2818 {
2819 struct cm_id_private *cm_id_priv;
2820 struct cm_apr_msg *apr_msg;
2821 int ret;
2822
2823 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2824 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2825 apr_msg->local_comm_id);
2826 if (!cm_id_priv)
2827 return -EINVAL; /* Unmatched reply. */
2828
2829 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2830 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2831 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2832 work->cm_event.private_data = &apr_msg->private_data;
2833
2834 spin_lock_irq(&cm_id_priv->lock);
2835 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2836 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2837 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2838 spin_unlock_irq(&cm_id_priv->lock);
2839 goto out;
2840 }
2841 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2842 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2843 cm_id_priv->msg = NULL;
2844
2845 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2846 if (!ret)
2847 list_add_tail(&work->list, &cm_id_priv->work_list);
2848 spin_unlock_irq(&cm_id_priv->lock);
2849
2850 if (ret)
2851 cm_process_work(cm_id_priv, work);
2852 else
2853 cm_deref_id(cm_id_priv);
2854 return 0;
2855 out:
2856 cm_deref_id(cm_id_priv);
2857 return -EINVAL;
2858 }
2859
2860 static int cm_timewait_handler(struct cm_work *work)
2861 {
2862 struct cm_timewait_info *timewait_info;
2863 struct cm_id_private *cm_id_priv;
2864 int ret;
2865
2866 timewait_info = (struct cm_timewait_info *)work;
2867 spin_lock_irq(&cm.lock);
2868 list_del(&timewait_info->list);
2869 spin_unlock_irq(&cm.lock);
2870
2871 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2872 timewait_info->work.remote_id);
2873 if (!cm_id_priv)
2874 return -EINVAL;
2875
2876 spin_lock_irq(&cm_id_priv->lock);
2877 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2878 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2879 spin_unlock_irq(&cm_id_priv->lock);
2880 goto out;
2881 }
2882 cm_id_priv->id.state = IB_CM_IDLE;
2883 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2884 if (!ret)
2885 list_add_tail(&work->list, &cm_id_priv->work_list);
2886 spin_unlock_irq(&cm_id_priv->lock);
2887
2888 if (ret)
2889 cm_process_work(cm_id_priv, work);
2890 else
2891 cm_deref_id(cm_id_priv);
2892 return 0;
2893 out:
2894 cm_deref_id(cm_id_priv);
2895 return -EINVAL;
2896 }
2897
2898 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2899 struct cm_id_private *cm_id_priv,
2900 struct ib_cm_sidr_req_param *param)
2901 {
2902 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2903 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2904 sidr_req_msg->request_id = cm_id_priv->id.local_id;
2905 sidr_req_msg->pkey = param->path->pkey;
2906 sidr_req_msg->service_id = param->service_id;
2907
2908 if (param->private_data && param->private_data_len)
2909 memcpy(sidr_req_msg->private_data, param->private_data,
2910 param->private_data_len);
2911 }
2912
2913 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2914 struct ib_cm_sidr_req_param *param)
2915 {
2916 struct cm_id_private *cm_id_priv;
2917 struct ib_mad_send_buf *msg;
2918 unsigned long flags;
2919 int ret;
2920
2921 if (!param->path || (param->private_data &&
2922 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2923 return -EINVAL;
2924
2925 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2926 ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2927 if (ret)
2928 goto out;
2929
2930 cm_id->service_id = param->service_id;
2931 cm_id->service_mask = ~cpu_to_be64(0);
2932 cm_id_priv->timeout_ms = param->timeout_ms;
2933 cm_id_priv->max_cm_retries = param->max_cm_retries;
2934 ret = cm_alloc_msg(cm_id_priv, &msg);
2935 if (ret)
2936 goto out;
2937
2938 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2939 param);
2940 msg->timeout_ms = cm_id_priv->timeout_ms;
2941 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2942
2943 spin_lock_irqsave(&cm_id_priv->lock, flags);
2944 if (cm_id->state == IB_CM_IDLE)
2945 ret = ib_post_send_mad(msg, NULL);
2946 else
2947 ret = -EINVAL;
2948
2949 if (ret) {
2950 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2951 cm_free_msg(msg);
2952 goto out;
2953 }
2954 cm_id->state = IB_CM_SIDR_REQ_SENT;
2955 cm_id_priv->msg = msg;
2956 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2957 out:
2958 return ret;
2959 }
2960 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2961
2962 static void cm_format_sidr_req_event(struct cm_work *work,
2963 struct ib_cm_id *listen_id)
2964 {
2965 struct cm_sidr_req_msg *sidr_req_msg;
2966 struct ib_cm_sidr_req_event_param *param;
2967
2968 sidr_req_msg = (struct cm_sidr_req_msg *)
2969 work->mad_recv_wc->recv_buf.mad;
2970 param = &work->cm_event.param.sidr_req_rcvd;
2971 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2972 param->listen_id = listen_id;
2973 param->port = work->port->port_num;
2974 work->cm_event.private_data = &sidr_req_msg->private_data;
2975 }
2976
2977 static int cm_sidr_req_handler(struct cm_work *work)
2978 {
2979 struct ib_cm_id *cm_id;
2980 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2981 struct cm_sidr_req_msg *sidr_req_msg;
2982 struct ib_wc *wc;
2983
2984 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
2985 if (IS_ERR(cm_id))
2986 return PTR_ERR(cm_id);
2987 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2988
2989 /* Record SGID/SLID and request ID for lookup. */
2990 sidr_req_msg = (struct cm_sidr_req_msg *)
2991 work->mad_recv_wc->recv_buf.mad;
2992 wc = work->mad_recv_wc->wc;
2993 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2994 cm_id_priv->av.dgid.global.interface_id = 0;
2995 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2996 work->mad_recv_wc->recv_buf.grh,
2997 &cm_id_priv->av);
2998 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
2999 cm_id_priv->tid = sidr_req_msg->hdr.tid;
3000 atomic_inc(&cm_id_priv->work_count);
3001
3002 spin_lock_irq(&cm.lock);
3003 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3004 if (cur_cm_id_priv) {
3005 spin_unlock_irq(&cm.lock);
3006 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3007 counter[CM_SIDR_REQ_COUNTER]);
3008 goto out; /* Duplicate message. */
3009 }
3010 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3011 cur_cm_id_priv = cm_find_listen(cm_id->device,
3012 sidr_req_msg->service_id,
3013 sidr_req_msg->private_data);
3014 if (!cur_cm_id_priv) {
3015 spin_unlock_irq(&cm.lock);
3016 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED);
3017 goto out; /* No match. */
3018 }
3019 atomic_inc(&cur_cm_id_priv->refcount);
3020 atomic_inc(&cm_id_priv->refcount);
3021 spin_unlock_irq(&cm.lock);
3022
3023 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
3024 cm_id_priv->id.context = cur_cm_id_priv->id.context;
3025 cm_id_priv->id.service_id = sidr_req_msg->service_id;
3026 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3027
3028 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
3029 cm_process_work(cm_id_priv, work);
3030 cm_deref_id(cur_cm_id_priv);
3031 return 0;
3032 out:
3033 ib_destroy_cm_id(&cm_id_priv->id);
3034 return -EINVAL;
3035 }
3036
3037 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3038 struct cm_id_private *cm_id_priv,
3039 struct ib_cm_sidr_rep_param *param)
3040 {
3041 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3042 cm_id_priv->tid);
3043 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
3044 sidr_rep_msg->status = param->status;
3045 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
3046 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
3047 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
3048
3049 if (param->info && param->info_length)
3050 memcpy(sidr_rep_msg->info, param->info, param->info_length);
3051
3052 if (param->private_data && param->private_data_len)
3053 memcpy(sidr_rep_msg->private_data, param->private_data,
3054 param->private_data_len);
3055 }
3056
3057 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3058 struct ib_cm_sidr_rep_param *param)
3059 {
3060 struct cm_id_private *cm_id_priv;
3061 struct ib_mad_send_buf *msg;
3062 unsigned long flags;
3063 int ret;
3064
3065 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3066 (param->private_data &&
3067 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3068 return -EINVAL;
3069
3070 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3071 spin_lock_irqsave(&cm_id_priv->lock, flags);
3072 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
3073 ret = -EINVAL;
3074 goto error;
3075 }
3076
3077 ret = cm_alloc_msg(cm_id_priv, &msg);
3078 if (ret)
3079 goto error;
3080
3081 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3082 param);
3083 ret = ib_post_send_mad(msg, NULL);
3084 if (ret) {
3085 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3086 cm_free_msg(msg);
3087 return ret;
3088 }
3089 cm_id->state = IB_CM_IDLE;
3090 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3091
3092 spin_lock_irqsave(&cm.lock, flags);
3093 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3094 spin_unlock_irqrestore(&cm.lock, flags);
3095 return 0;
3096
3097 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3098 return ret;
3099 }
3100 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3101
3102 static void cm_format_sidr_rep_event(struct cm_work *work)
3103 {
3104 struct cm_sidr_rep_msg *sidr_rep_msg;
3105 struct ib_cm_sidr_rep_event_param *param;
3106
3107 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3108 work->mad_recv_wc->recv_buf.mad;
3109 param = &work->cm_event.param.sidr_rep_rcvd;
3110 param->status = sidr_rep_msg->status;
3111 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
3112 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
3113 param->info = &sidr_rep_msg->info;
3114 param->info_len = sidr_rep_msg->info_length;
3115 work->cm_event.private_data = &sidr_rep_msg->private_data;
3116 }
3117
3118 static int cm_sidr_rep_handler(struct cm_work *work)
3119 {
3120 struct cm_sidr_rep_msg *sidr_rep_msg;
3121 struct cm_id_private *cm_id_priv;
3122
3123 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3124 work->mad_recv_wc->recv_buf.mad;
3125 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
3126 if (!cm_id_priv)
3127 return -EINVAL; /* Unmatched reply. */
3128
3129 spin_lock_irq(&cm_id_priv->lock);
3130 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3131 spin_unlock_irq(&cm_id_priv->lock);
3132 goto out;
3133 }
3134 cm_id_priv->id.state = IB_CM_IDLE;
3135 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3136 spin_unlock_irq(&cm_id_priv->lock);
3137
3138 cm_format_sidr_rep_event(work);
3139 cm_process_work(cm_id_priv, work);
3140 return 0;
3141 out:
3142 cm_deref_id(cm_id_priv);
3143 return -EINVAL;
3144 }
3145
3146 static void cm_process_send_error(struct ib_mad_send_buf *msg,
3147 enum ib_wc_status wc_status)
3148 {
3149 struct cm_id_private *cm_id_priv;
3150 struct ib_cm_event cm_event;
3151 enum ib_cm_state state;
3152 int ret;
3153
3154 memset(&cm_event, 0, sizeof cm_event);
3155 cm_id_priv = msg->context[0];
3156
3157 /* Discard old sends or ones without a response. */
3158 spin_lock_irq(&cm_id_priv->lock);
3159 state = (enum ib_cm_state) (unsigned long) msg->context[1];
3160 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3161 goto discard;
3162
3163 switch (state) {
3164 case IB_CM_REQ_SENT:
3165 case IB_CM_MRA_REQ_RCVD:
3166 cm_reset_to_idle(cm_id_priv);
3167 cm_event.event = IB_CM_REQ_ERROR;
3168 break;
3169 case IB_CM_REP_SENT:
3170 case IB_CM_MRA_REP_RCVD:
3171 cm_reset_to_idle(cm_id_priv);
3172 cm_event.event = IB_CM_REP_ERROR;
3173 break;
3174 case IB_CM_DREQ_SENT:
3175 cm_enter_timewait(cm_id_priv);
3176 cm_event.event = IB_CM_DREQ_ERROR;
3177 break;
3178 case IB_CM_SIDR_REQ_SENT:
3179 cm_id_priv->id.state = IB_CM_IDLE;
3180 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3181 break;
3182 default:
3183 goto discard;
3184 }
3185 spin_unlock_irq(&cm_id_priv->lock);
3186 cm_event.param.send_status = wc_status;
3187
3188 /* No other events can occur on the cm_id at this point. */
3189 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3190 cm_free_msg(msg);
3191 if (ret)
3192 ib_destroy_cm_id(&cm_id_priv->id);
3193 return;
3194 discard:
3195 spin_unlock_irq(&cm_id_priv->lock);
3196 cm_free_msg(msg);
3197 }
3198
3199 static void cm_send_handler(struct ib_mad_agent *mad_agent,
3200 struct ib_mad_send_wc *mad_send_wc)
3201 {
3202 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3203 struct cm_port *port;
3204 u16 attr_index;
3205
3206 port = mad_agent->context;
3207 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3208 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3209
3210 /*
3211 * If the send was in response to a received message (context[0] is not
3212 * set to a cm_id), and is not a REJ, then it is a send that was
3213 * manually retried.
3214 */
3215 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3216 msg->retries = 1;
3217
3218 atomic_long_add(1 + msg->retries,
3219 &port->counter_group[CM_XMIT].counter[attr_index]);
3220 if (msg->retries)
3221 atomic_long_add(msg->retries,
3222 &port->counter_group[CM_XMIT_RETRIES].
3223 counter[attr_index]);
3224
3225 switch (mad_send_wc->status) {
3226 case IB_WC_SUCCESS:
3227 case IB_WC_WR_FLUSH_ERR:
3228 cm_free_msg(msg);
3229 break;
3230 default:
3231 if (msg->context[0] && msg->context[1])
3232 cm_process_send_error(msg, mad_send_wc->status);
3233 else
3234 cm_free_msg(msg);
3235 break;
3236 }
3237 }
3238
3239 static void cm_work_handler(struct work_struct *_work)
3240 {
3241 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3242 int ret;
3243
3244 switch (work->cm_event.event) {
3245 case IB_CM_REQ_RECEIVED:
3246 ret = cm_req_handler(work);
3247 break;
3248 case IB_CM_MRA_RECEIVED:
3249 ret = cm_mra_handler(work);
3250 break;
3251 case IB_CM_REJ_RECEIVED:
3252 ret = cm_rej_handler(work);
3253 break;
3254 case IB_CM_REP_RECEIVED:
3255 ret = cm_rep_handler(work);
3256 break;
3257 case IB_CM_RTU_RECEIVED:
3258 ret = cm_rtu_handler(work);
3259 break;
3260 case IB_CM_USER_ESTABLISHED:
3261 ret = cm_establish_handler(work);
3262 break;
3263 case IB_CM_DREQ_RECEIVED:
3264 ret = cm_dreq_handler(work);
3265 break;
3266 case IB_CM_DREP_RECEIVED:
3267 ret = cm_drep_handler(work);
3268 break;
3269 case IB_CM_SIDR_REQ_RECEIVED:
3270 ret = cm_sidr_req_handler(work);
3271 break;
3272 case IB_CM_SIDR_REP_RECEIVED:
3273 ret = cm_sidr_rep_handler(work);
3274 break;
3275 case IB_CM_LAP_RECEIVED:
3276 ret = cm_lap_handler(work);
3277 break;
3278 case IB_CM_APR_RECEIVED:
3279 ret = cm_apr_handler(work);
3280 break;
3281 case IB_CM_TIMEWAIT_EXIT:
3282 ret = cm_timewait_handler(work);
3283 break;
3284 default:
3285 ret = -EINVAL;
3286 break;
3287 }
3288 if (ret)
3289 cm_free_work(work);
3290 }
3291
3292 static int cm_establish(struct ib_cm_id *cm_id)
3293 {
3294 struct cm_id_private *cm_id_priv;
3295 struct cm_work *work;
3296 unsigned long flags;
3297 int ret = 0;
3298
3299 work = kmalloc(sizeof *work, GFP_ATOMIC);
3300 if (!work)
3301 return -ENOMEM;
3302
3303 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3304 spin_lock_irqsave(&cm_id_priv->lock, flags);
3305 switch (cm_id->state)
3306 {
3307 case IB_CM_REP_SENT:
3308 case IB_CM_MRA_REP_RCVD:
3309 cm_id->state = IB_CM_ESTABLISHED;
3310 break;
3311 case IB_CM_ESTABLISHED:
3312 ret = -EISCONN;
3313 break;
3314 default:
3315 ret = -EINVAL;
3316 break;
3317 }
3318 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3319
3320 if (ret) {
3321 kfree(work);
3322 goto out;
3323 }
3324
3325 /*
3326 * The CM worker thread may try to destroy the cm_id before it
3327 * can execute this work item. To prevent potential deadlock,
3328 * we need to find the cm_id once we're in the context of the
3329 * worker thread, rather than holding a reference on it.
3330 */
3331 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3332 work->local_id = cm_id->local_id;
3333 work->remote_id = cm_id->remote_id;
3334 work->mad_recv_wc = NULL;
3335 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3336 queue_delayed_work(cm.wq, &work->work, 0);
3337 out:
3338 return ret;
3339 }
3340
3341 static int cm_migrate(struct ib_cm_id *cm_id)
3342 {
3343 struct cm_id_private *cm_id_priv;
3344 unsigned long flags;
3345 int ret = 0;
3346
3347 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3348 spin_lock_irqsave(&cm_id_priv->lock, flags);
3349 if (cm_id->state == IB_CM_ESTABLISHED &&
3350 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3351 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3352 cm_id->lap_state = IB_CM_LAP_IDLE;
3353 cm_id_priv->av = cm_id_priv->alt_av;
3354 } else
3355 ret = -EINVAL;
3356 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3357
3358 return ret;
3359 }
3360
3361 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3362 {
3363 int ret;
3364
3365 switch (event) {
3366 case IB_EVENT_COMM_EST:
3367 ret = cm_establish(cm_id);
3368 break;
3369 case IB_EVENT_PATH_MIG:
3370 ret = cm_migrate(cm_id);
3371 break;
3372 default:
3373 ret = -EINVAL;
3374 }
3375 return ret;
3376 }
3377 EXPORT_SYMBOL(ib_cm_notify);
3378
3379 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3380 struct ib_mad_recv_wc *mad_recv_wc)
3381 {
3382 struct cm_port *port = mad_agent->context;
3383 struct cm_work *work;
3384 enum ib_cm_event_type event;
3385 u16 attr_id;
3386 int paths = 0;
3387
3388 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3389 case CM_REQ_ATTR_ID:
3390 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3391 alt_local_lid != 0);
3392 event = IB_CM_REQ_RECEIVED;
3393 break;
3394 case CM_MRA_ATTR_ID:
3395 event = IB_CM_MRA_RECEIVED;
3396 break;
3397 case CM_REJ_ATTR_ID:
3398 event = IB_CM_REJ_RECEIVED;
3399 break;
3400 case CM_REP_ATTR_ID:
3401 event = IB_CM_REP_RECEIVED;
3402 break;
3403 case CM_RTU_ATTR_ID:
3404 event = IB_CM_RTU_RECEIVED;
3405 break;
3406 case CM_DREQ_ATTR_ID:
3407 event = IB_CM_DREQ_RECEIVED;
3408 break;
3409 case CM_DREP_ATTR_ID:
3410 event = IB_CM_DREP_RECEIVED;
3411 break;
3412 case CM_SIDR_REQ_ATTR_ID:
3413 event = IB_CM_SIDR_REQ_RECEIVED;
3414 break;
3415 case CM_SIDR_REP_ATTR_ID:
3416 event = IB_CM_SIDR_REP_RECEIVED;
3417 break;
3418 case CM_LAP_ATTR_ID:
3419 paths = 1;
3420 event = IB_CM_LAP_RECEIVED;
3421 break;
3422 case CM_APR_ATTR_ID:
3423 event = IB_CM_APR_RECEIVED;
3424 break;
3425 default:
3426 ib_free_recv_mad(mad_recv_wc);
3427 return;
3428 }
3429
3430 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
3431 atomic_long_inc(&port->counter_group[CM_RECV].
3432 counter[attr_id - CM_ATTR_ID_OFFSET]);
3433
3434 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3435 GFP_KERNEL);
3436 if (!work) {
3437 ib_free_recv_mad(mad_recv_wc);
3438 return;
3439 }
3440
3441 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3442 work->cm_event.event = event;
3443 work->mad_recv_wc = mad_recv_wc;
3444 work->port = port;
3445 queue_delayed_work(cm.wq, &work->work, 0);
3446 }
3447
3448 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3449 struct ib_qp_attr *qp_attr,
3450 int *qp_attr_mask)
3451 {
3452 unsigned long flags;
3453 int ret;
3454
3455 spin_lock_irqsave(&cm_id_priv->lock, flags);
3456 switch (cm_id_priv->id.state) {
3457 case IB_CM_REQ_SENT:
3458 case IB_CM_MRA_REQ_RCVD:
3459 case IB_CM_REQ_RCVD:
3460 case IB_CM_MRA_REQ_SENT:
3461 case IB_CM_REP_RCVD:
3462 case IB_CM_MRA_REP_SENT:
3463 case IB_CM_REP_SENT:
3464 case IB_CM_MRA_REP_RCVD:
3465 case IB_CM_ESTABLISHED:
3466 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3467 IB_QP_PKEY_INDEX | IB_QP_PORT;
3468 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
3469 if (cm_id_priv->responder_resources)
3470 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3471 IB_ACCESS_REMOTE_ATOMIC;
3472 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3473 qp_attr->port_num = cm_id_priv->av.port->port_num;
3474 ret = 0;
3475 break;
3476 default:
3477 ret = -EINVAL;
3478 break;
3479 }
3480 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3481 return ret;
3482 }
3483
3484 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3485 struct ib_qp_attr *qp_attr,
3486 int *qp_attr_mask)
3487 {
3488 unsigned long flags;
3489 int ret;
3490
3491 spin_lock_irqsave(&cm_id_priv->lock, flags);
3492 switch (cm_id_priv->id.state) {
3493 case IB_CM_REQ_RCVD:
3494 case IB_CM_MRA_REQ_SENT:
3495 case IB_CM_REP_RCVD:
3496 case IB_CM_MRA_REP_SENT:
3497 case IB_CM_REP_SENT:
3498 case IB_CM_MRA_REP_RCVD:
3499 case IB_CM_ESTABLISHED:
3500 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3501 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3502 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3503 qp_attr->path_mtu = cm_id_priv->path_mtu;
3504 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3505 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3506 if (cm_id_priv->qp_type == IB_QPT_RC ||
3507 cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
3508 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3509 IB_QP_MIN_RNR_TIMER;
3510 qp_attr->max_dest_rd_atomic =
3511 cm_id_priv->responder_resources;
3512 qp_attr->min_rnr_timer = 0;
3513 }
3514 if (cm_id_priv->alt_av.ah_attr.dlid) {
3515 *qp_attr_mask |= IB_QP_ALT_PATH;
3516 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3517 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3518 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3519 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3520 }
3521 ret = 0;
3522 break;
3523 default:
3524 ret = -EINVAL;
3525 break;
3526 }
3527 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3528 return ret;
3529 }
3530
3531 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3532 struct ib_qp_attr *qp_attr,
3533 int *qp_attr_mask)
3534 {
3535 unsigned long flags;
3536 int ret;
3537
3538 spin_lock_irqsave(&cm_id_priv->lock, flags);
3539 switch (cm_id_priv->id.state) {
3540 /* Allow transition to RTS before sending REP */
3541 case IB_CM_REQ_RCVD:
3542 case IB_CM_MRA_REQ_SENT:
3543
3544 case IB_CM_REP_RCVD:
3545 case IB_CM_MRA_REP_SENT:
3546 case IB_CM_REP_SENT:
3547 case IB_CM_MRA_REP_RCVD:
3548 case IB_CM_ESTABLISHED:
3549 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
3550 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3551 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3552 switch (cm_id_priv->qp_type) {
3553 case IB_QPT_RC:
3554 case IB_QPT_XRC_INI:
3555 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
3556 IB_QP_MAX_QP_RD_ATOMIC;
3557 qp_attr->retry_cnt = cm_id_priv->retry_count;
3558 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3559 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3560 /* fall through */
3561 case IB_QPT_XRC_TGT:
3562 *qp_attr_mask |= IB_QP_TIMEOUT;
3563 qp_attr->timeout = cm_id_priv->av.timeout;
3564 break;
3565 default:
3566 break;
3567 }
3568 if (cm_id_priv->alt_av.ah_attr.dlid) {
3569 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3570 qp_attr->path_mig_state = IB_MIG_REARM;
3571 }
3572 } else {
3573 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
3574 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3575 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3576 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3577 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3578 qp_attr->path_mig_state = IB_MIG_REARM;
3579 }
3580 ret = 0;
3581 break;
3582 default:
3583 ret = -EINVAL;
3584 break;
3585 }
3586 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3587 return ret;
3588 }
3589
3590 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3591 struct ib_qp_attr *qp_attr,
3592 int *qp_attr_mask)
3593 {
3594 struct cm_id_private *cm_id_priv;
3595 int ret;
3596
3597 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3598 switch (qp_attr->qp_state) {
3599 case IB_QPS_INIT:
3600 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3601 break;
3602 case IB_QPS_RTR:
3603 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3604 break;
3605 case IB_QPS_RTS:
3606 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3607 break;
3608 default:
3609 ret = -EINVAL;
3610 break;
3611 }
3612 return ret;
3613 }
3614 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3615
3616 static void cm_get_ack_delay(struct cm_device *cm_dev)
3617 {
3618 struct ib_device_attr attr;
3619
3620 if (ib_query_device(cm_dev->ib_device, &attr))
3621 cm_dev->ack_delay = 0; /* acks will rely on packet life time */
3622 else
3623 cm_dev->ack_delay = attr.local_ca_ack_delay;
3624 }
3625
3626 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
3627 char *buf)
3628 {
3629 struct cm_counter_group *group;
3630 struct cm_counter_attribute *cm_attr;
3631
3632 group = container_of(obj, struct cm_counter_group, obj);
3633 cm_attr = container_of(attr, struct cm_counter_attribute, attr);
3634
3635 return sprintf(buf, "%ld\n",
3636 atomic_long_read(&group->counter[cm_attr->index]));
3637 }
3638
3639 static const struct sysfs_ops cm_counter_ops = {
3640 .show = cm_show_counter
3641 };
3642
3643 static struct kobj_type cm_counter_obj_type = {
3644 .sysfs_ops = &cm_counter_ops,
3645 .default_attrs = cm_counter_default_attrs
3646 };
3647
3648 static void cm_release_port_obj(struct kobject *obj)
3649 {
3650 struct cm_port *cm_port;
3651
3652 cm_port = container_of(obj, struct cm_port, port_obj);
3653 kfree(cm_port);
3654 }
3655
3656 static struct kobj_type cm_port_obj_type = {
3657 .release = cm_release_port_obj
3658 };
3659
3660 static char *cm_devnode(struct device *dev, umode_t *mode)
3661 {
3662 if (mode)
3663 *mode = 0666;
3664 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
3665 }
3666
3667 struct class cm_class = {
3668 .owner = THIS_MODULE,
3669 .name = "infiniband_cm",
3670 .devnode = cm_devnode,
3671 };
3672 EXPORT_SYMBOL(cm_class);
3673
3674 static int cm_create_port_fs(struct cm_port *port)
3675 {
3676 int i, ret;
3677
3678 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type,
3679 &port->cm_dev->device->kobj,
3680 "%d", port->port_num);
3681 if (ret) {
3682 kfree(port);
3683 return ret;
3684 }
3685
3686 for (i = 0; i < CM_COUNTER_GROUPS; i++) {
3687 ret = kobject_init_and_add(&port->counter_group[i].obj,
3688 &cm_counter_obj_type,
3689 &port->port_obj,
3690 "%s", counter_group_names[i]);
3691 if (ret)
3692 goto error;
3693 }
3694
3695 return 0;
3696
3697 error:
3698 while (i--)
3699 kobject_put(&port->counter_group[i].obj);
3700 kobject_put(&port->port_obj);
3701 return ret;
3702
3703 }
3704
3705 static void cm_remove_port_fs(struct cm_port *port)
3706 {
3707 int i;
3708
3709 for (i = 0; i < CM_COUNTER_GROUPS; i++)
3710 kobject_put(&port->counter_group[i].obj);
3711
3712 kobject_put(&port->port_obj);
3713 }
3714
3715 static void cm_add_one(struct ib_device *ib_device)
3716 {
3717 struct cm_device *cm_dev;
3718 struct cm_port *port;
3719 struct ib_mad_reg_req reg_req = {
3720 .mgmt_class = IB_MGMT_CLASS_CM,
3721 .mgmt_class_version = IB_CM_CLASS_VERSION
3722 };
3723 struct ib_port_modify port_modify = {
3724 .set_port_cap_mask = IB_PORT_CM_SUP
3725 };
3726 unsigned long flags;
3727 int ret;
3728 u8 i;
3729
3730 if (rdma_node_get_transport(ib_device->node_type) != RDMA_TRANSPORT_IB)
3731 return;
3732
3733 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) *
3734 ib_device->phys_port_cnt, GFP_KERNEL);
3735 if (!cm_dev)
3736 return;
3737
3738 cm_dev->ib_device = ib_device;
3739 cm_get_ack_delay(cm_dev);
3740
3741 cm_dev->device = device_create(&cm_class, &ib_device->dev,
3742 MKDEV(0, 0), NULL,
3743 "%s", ib_device->name);
3744 if (IS_ERR(cm_dev->device)) {
3745 kfree(cm_dev);
3746 return;
3747 }
3748
3749 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3750 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3751 port = kzalloc(sizeof *port, GFP_KERNEL);
3752 if (!port)
3753 goto error1;
3754
3755 cm_dev->port[i-1] = port;
3756 port->cm_dev = cm_dev;
3757 port->port_num = i;
3758
3759 ret = cm_create_port_fs(port);
3760 if (ret)
3761 goto error1;
3762
3763 port->mad_agent = ib_register_mad_agent(ib_device, i,
3764 IB_QPT_GSI,
3765 &reg_req,
3766 0,
3767 cm_send_handler,
3768 cm_recv_handler,
3769 port);
3770 if (IS_ERR(port->mad_agent))
3771 goto error2;
3772
3773 ret = ib_modify_port(ib_device, i, 0, &port_modify);
3774 if (ret)
3775 goto error3;
3776 }
3777 ib_set_client_data(ib_device, &cm_client, cm_dev);
3778
3779 write_lock_irqsave(&cm.device_lock, flags);
3780 list_add_tail(&cm_dev->list, &cm.device_list);
3781 write_unlock_irqrestore(&cm.device_lock, flags);
3782 return;
3783
3784 error3:
3785 ib_unregister_mad_agent(port->mad_agent);
3786 error2:
3787 cm_remove_port_fs(port);
3788 error1:
3789 port_modify.set_port_cap_mask = 0;
3790 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3791 while (--i) {
3792 port = cm_dev->port[i-1];
3793 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3794 ib_unregister_mad_agent(port->mad_agent);
3795 cm_remove_port_fs(port);
3796 }
3797 device_unregister(cm_dev->device);
3798 kfree(cm_dev);
3799 }
3800
3801 static void cm_remove_one(struct ib_device *ib_device)
3802 {
3803 struct cm_device *cm_dev;
3804 struct cm_port *port;
3805 struct ib_port_modify port_modify = {
3806 .clr_port_cap_mask = IB_PORT_CM_SUP
3807 };
3808 unsigned long flags;
3809 int i;
3810
3811 cm_dev = ib_get_client_data(ib_device, &cm_client);
3812 if (!cm_dev)
3813 return;
3814
3815 write_lock_irqsave(&cm.device_lock, flags);
3816 list_del(&cm_dev->list);
3817 write_unlock_irqrestore(&cm.device_lock, flags);
3818
3819 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3820 port = cm_dev->port[i-1];
3821 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3822 ib_unregister_mad_agent(port->mad_agent);
3823 flush_workqueue(cm.wq);
3824 cm_remove_port_fs(port);
3825 }
3826 device_unregister(cm_dev->device);
3827 kfree(cm_dev);
3828 }
3829
3830 static int __init ib_cm_init(void)
3831 {
3832 int ret;
3833
3834 memset(&cm, 0, sizeof cm);
3835 INIT_LIST_HEAD(&cm.device_list);
3836 rwlock_init(&cm.device_lock);
3837 spin_lock_init(&cm.lock);
3838 cm.listen_service_table = RB_ROOT;
3839 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3840 cm.remote_id_table = RB_ROOT;
3841 cm.remote_qp_table = RB_ROOT;
3842 cm.remote_sidr_table = RB_ROOT;
3843 idr_init(&cm.local_id_table);
3844 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3845 INIT_LIST_HEAD(&cm.timewait_list);
3846
3847 ret = class_register(&cm_class);
3848 if (ret) {
3849 ret = -ENOMEM;
3850 goto error1;
3851 }
3852
3853 cm.wq = create_workqueue("ib_cm");
3854 if (!cm.wq) {
3855 ret = -ENOMEM;
3856 goto error2;
3857 }
3858
3859 ret = ib_register_client(&cm_client);
3860 if (ret)
3861 goto error3;
3862
3863 return 0;
3864 error3:
3865 destroy_workqueue(cm.wq);
3866 error2:
3867 class_unregister(&cm_class);
3868 error1:
3869 idr_destroy(&cm.local_id_table);
3870 return ret;
3871 }
3872
3873 static void __exit ib_cm_cleanup(void)
3874 {
3875 struct cm_timewait_info *timewait_info, *tmp;
3876
3877 spin_lock_irq(&cm.lock);
3878 list_for_each_entry(timewait_info, &cm.timewait_list, list)
3879 cancel_delayed_work(&timewait_info->work.work);
3880 spin_unlock_irq(&cm.lock);
3881
3882 ib_unregister_client(&cm_client);
3883 destroy_workqueue(cm.wq);
3884
3885 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
3886 list_del(&timewait_info->list);
3887 kfree(timewait_info);
3888 }
3889
3890 class_unregister(&cm_class);
3891 idr_destroy(&cm.local_id_table);
3892 }
3893
3894 module_init(ib_cm_init);
3895 module_exit(ib_cm_cleanup);
3896
Linux kernel - Deliverables
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