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Linux 3.18.86
[linux/fpc-iii.git] / drivers / infiniband / core / cm.c
blobc3a83f7aa096152ae6f396b6e64a4dea98daba19
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 #include <linux/etherdevice.h>
51
52 #include <rdma/ib_cache.h>
53 #include <rdma/ib_cm.h>
54 #include "cm_msgs.h"
55
56 MODULE_AUTHOR("Sean Hefty");
57 MODULE_DESCRIPTION("InfiniBand CM");
58 MODULE_LICENSE("Dual BSD/GPL");
59
60 static void cm_add_one(struct ib_device *device);
61 static void cm_remove_one(struct ib_device *device);
62
63 static struct ib_client cm_client = {
64 .name = "cm",
65 .add = cm_add_one,
66 .remove = cm_remove_one
67 };
68
69 static struct ib_cm {
70 spinlock_t lock;
71 struct list_head device_list;
72 rwlock_t device_lock;
73 struct rb_root listen_service_table;
74 u64 listen_service_id;
75 /* struct rb_root peer_service_table; todo: fix peer to peer */
76 struct rb_root remote_qp_table;
77 struct rb_root remote_id_table;
78 struct rb_root remote_sidr_table;
79 struct idr local_id_table;
80 __be32 random_id_operand;
81 struct list_head timewait_list;
82 struct workqueue_struct *wq;
83 } cm;
84
85 /* Counter indexes ordered by attribute ID */
86 enum {
87 CM_REQ_COUNTER,
88 CM_MRA_COUNTER,
89 CM_REJ_COUNTER,
90 CM_REP_COUNTER,
91 CM_RTU_COUNTER,
92 CM_DREQ_COUNTER,
93 CM_DREP_COUNTER,
94 CM_SIDR_REQ_COUNTER,
95 CM_SIDR_REP_COUNTER,
96 CM_LAP_COUNTER,
97 CM_APR_COUNTER,
98 CM_ATTR_COUNT,
99 CM_ATTR_ID_OFFSET = 0x0010,
100 };
101
102 enum {
103 CM_XMIT,
104 CM_XMIT_RETRIES,
105 CM_RECV,
106 CM_RECV_DUPLICATES,
107 CM_COUNTER_GROUPS
108 };
109
110 static char const counter_group_names[CM_COUNTER_GROUPS]
111 [sizeof("cm_rx_duplicates")] = {
112 "cm_tx_msgs", "cm_tx_retries",
113 "cm_rx_msgs", "cm_rx_duplicates"
114 };
115
116 struct cm_counter_group {
117 struct kobject obj;
118 atomic_long_t counter[CM_ATTR_COUNT];
119 };
120
121 struct cm_counter_attribute {
122 struct attribute attr;
123 int index;
124 };
125
126 #define CM_COUNTER_ATTR(_name, _index) \
127 struct cm_counter_attribute cm_##_name##_counter_attr = { \
128 .attr = { .name = __stringify(_name), .mode = 0444 }, \
129 .index = _index \
130 }
131
132 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
133 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
134 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
135 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
136 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
137 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
138 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
139 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
140 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
141 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
142 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
143
144 static struct attribute *cm_counter_default_attrs[] = {
145 &cm_req_counter_attr.attr,
146 &cm_mra_counter_attr.attr,
147 &cm_rej_counter_attr.attr,
148 &cm_rep_counter_attr.attr,
149 &cm_rtu_counter_attr.attr,
150 &cm_dreq_counter_attr.attr,
151 &cm_drep_counter_attr.attr,
152 &cm_sidr_req_counter_attr.attr,
153 &cm_sidr_rep_counter_attr.attr,
154 &cm_lap_counter_attr.attr,
155 &cm_apr_counter_attr.attr,
156 NULL
157 };
158
159 struct cm_port {
160 struct cm_device *cm_dev;
161 struct ib_mad_agent *mad_agent;
162 struct kobject port_obj;
163 u8 port_num;
164 struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
165 };
166
167 struct cm_device {
168 struct list_head list;
169 struct ib_device *ib_device;
170 struct device *device;
171 u8 ack_delay;
172 struct cm_port *port[0];
173 };
174
175 struct cm_av {
176 struct cm_port *port;
177 union ib_gid dgid;
178 struct ib_ah_attr ah_attr;
179 u16 pkey_index;
180 u8 timeout;
181 u8 valid;
182 u8 smac[ETH_ALEN];
183 };
184
185 struct cm_work {
186 struct delayed_work work;
187 struct list_head list;
188 struct cm_port *port;
189 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
190 __be32 local_id; /* Established / timewait */
191 __be32 remote_id;
192 struct ib_cm_event cm_event;
193 struct ib_sa_path_rec path[0];
194 };
195
196 struct cm_timewait_info {
197 struct cm_work work; /* Must be first. */
198 struct list_head list;
199 struct rb_node remote_qp_node;
200 struct rb_node remote_id_node;
201 __be64 remote_ca_guid;
202 __be32 remote_qpn;
203 u8 inserted_remote_qp;
204 u8 inserted_remote_id;
205 };
206
207 struct cm_id_private {
208 struct ib_cm_id id;
209
210 struct rb_node service_node;
211 struct rb_node sidr_id_node;
212 spinlock_t lock; /* Do not acquire inside cm.lock */
213 struct completion comp;
214 atomic_t refcount;
215
216 struct ib_mad_send_buf *msg;
217 struct cm_timewait_info *timewait_info;
218 /* todo: use alternate port on send failure */
219 struct cm_av av;
220 struct cm_av alt_av;
221 struct ib_cm_compare_data *compare_data;
222
223 void *private_data;
224 __be64 tid;
225 __be32 local_qpn;
226 __be32 remote_qpn;
227 enum ib_qp_type qp_type;
228 __be32 sq_psn;
229 __be32 rq_psn;
230 int timeout_ms;
231 enum ib_mtu path_mtu;
232 __be16 pkey;
233 u8 private_data_len;
234 u8 max_cm_retries;
235 u8 peer_to_peer;
236 u8 responder_resources;
237 u8 initiator_depth;
238 u8 retry_count;
239 u8 rnr_retry_count;
240 u8 service_timeout;
241 u8 target_ack_delay;
242
243 struct list_head work_list;
244 atomic_t work_count;
245 };
246
247 static void cm_work_handler(struct work_struct *work);
248
249 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
250 {
251 if (atomic_dec_and_test(&cm_id_priv->refcount))
252 complete(&cm_id_priv->comp);
253 }
254
255 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
256 struct ib_mad_send_buf **msg)
257 {
258 struct ib_mad_agent *mad_agent;
259 struct ib_mad_send_buf *m;
260 struct ib_ah *ah;
261
262 mad_agent = cm_id_priv->av.port->mad_agent;
263 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
264 if (IS_ERR(ah))
265 return PTR_ERR(ah);
266
267 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
268 cm_id_priv->av.pkey_index,
269 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
270 GFP_ATOMIC);
271 if (IS_ERR(m)) {
272 ib_destroy_ah(ah);
273 return PTR_ERR(m);
274 }
275
276 /* Timeout set by caller if response is expected. */
277 m->ah = ah;
278 m->retries = cm_id_priv->max_cm_retries;
279
280 atomic_inc(&cm_id_priv->refcount);
281 m->context[0] = cm_id_priv;
282 *msg = m;
283 return 0;
284 }
285
286 static int cm_alloc_response_msg(struct cm_port *port,
287 struct ib_mad_recv_wc *mad_recv_wc,
288 struct ib_mad_send_buf **msg)
289 {
290 struct ib_mad_send_buf *m;
291 struct ib_ah *ah;
292
293 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
294 mad_recv_wc->recv_buf.grh, port->port_num);
295 if (IS_ERR(ah))
296 return PTR_ERR(ah);
297
298 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
299 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
300 GFP_ATOMIC);
301 if (IS_ERR(m)) {
302 ib_destroy_ah(ah);
303 return PTR_ERR(m);
304 }
305 m->ah = ah;
306 *msg = m;
307 return 0;
308 }
309
310 static void cm_free_msg(struct ib_mad_send_buf *msg)
311 {
312 ib_destroy_ah(msg->ah);
313 if (msg->context[0])
314 cm_deref_id(msg->context[0]);
315 ib_free_send_mad(msg);
316 }
317
318 static void * cm_copy_private_data(const void *private_data,
319 u8 private_data_len)
320 {
321 void *data;
322
323 if (!private_data || !private_data_len)
324 return NULL;
325
326 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
327 if (!data)
328 return ERR_PTR(-ENOMEM);
329
330 return data;
331 }
332
333 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
334 void *private_data, u8 private_data_len)
335 {
336 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
337 kfree(cm_id_priv->private_data);
338
339 cm_id_priv->private_data = private_data;
340 cm_id_priv->private_data_len = private_data_len;
341 }
342
343 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
344 struct ib_grh *grh, struct cm_av *av)
345 {
346 av->port = port;
347 av->pkey_index = wc->pkey_index;
348 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc,
349 grh, &av->ah_attr);
350 }
351
352 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
353 {
354 struct cm_device *cm_dev;
355 struct cm_port *port = NULL;
356 unsigned long flags;
357 int ret;
358 u8 p;
359
360 read_lock_irqsave(&cm.device_lock, flags);
361 list_for_each_entry(cm_dev, &cm.device_list, list) {
362 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid,
363 &p, NULL)) {
364 port = cm_dev->port[p-1];
365 break;
366 }
367 }
368 read_unlock_irqrestore(&cm.device_lock, flags);
369
370 if (!port)
371 return -EINVAL;
372
373 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
374 be16_to_cpu(path->pkey), &av->pkey_index);
375 if (ret)
376 return ret;
377
378 av->port = port;
379 ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path,
380 &av->ah_attr);
381 av->timeout = path->packet_life_time + 1;
382 memcpy(av->smac, path->smac, sizeof(av->smac));
383
384 av->valid = 1;
385 return 0;
386 }
387
388 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
389 {
390 unsigned long flags;
391 int id;
392
393 idr_preload(GFP_KERNEL);
394 spin_lock_irqsave(&cm.lock, flags);
395
396 id = idr_alloc_cyclic(&cm.local_id_table, cm_id_priv, 0, 0, GFP_NOWAIT);
397
398 spin_unlock_irqrestore(&cm.lock, flags);
399 idr_preload_end();
400
401 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
402 return id < 0 ? id : 0;
403 }
404
405 static void cm_free_id(__be32 local_id)
406 {
407 spin_lock_irq(&cm.lock);
408 idr_remove(&cm.local_id_table,
409 (__force int) (local_id ^ cm.random_id_operand));
410 spin_unlock_irq(&cm.lock);
411 }
412
413 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
414 {
415 struct cm_id_private *cm_id_priv;
416
417 cm_id_priv = idr_find(&cm.local_id_table,
418 (__force int) (local_id ^ cm.random_id_operand));
419 if (cm_id_priv) {
420 if (cm_id_priv->id.remote_id == remote_id)
421 atomic_inc(&cm_id_priv->refcount);
422 else
423 cm_id_priv = NULL;
424 }
425
426 return cm_id_priv;
427 }
428
429 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
430 {
431 struct cm_id_private *cm_id_priv;
432
433 spin_lock_irq(&cm.lock);
434 cm_id_priv = cm_get_id(local_id, remote_id);
435 spin_unlock_irq(&cm.lock);
436
437 return cm_id_priv;
438 }
439
440 static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
441 {
442 int i;
443
444 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
445 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
446 ((unsigned long *) mask)[i];
447 }
448
449 static int cm_compare_data(struct ib_cm_compare_data *src_data,
450 struct ib_cm_compare_data *dst_data)
451 {
452 u8 src[IB_CM_COMPARE_SIZE];
453 u8 dst[IB_CM_COMPARE_SIZE];
454
455 if (!src_data || !dst_data)
456 return 0;
457
458 cm_mask_copy(src, src_data->data, dst_data->mask);
459 cm_mask_copy(dst, dst_data->data, src_data->mask);
460 return memcmp(src, dst, IB_CM_COMPARE_SIZE);
461 }
462
463 static int cm_compare_private_data(u8 *private_data,
464 struct ib_cm_compare_data *dst_data)
465 {
466 u8 src[IB_CM_COMPARE_SIZE];
467
468 if (!dst_data)
469 return 0;
470
471 cm_mask_copy(src, private_data, dst_data->mask);
472 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
473 }
474
475 /*
476 * Trivial helpers to strip endian annotation and compare; the
477 * endianness doesn't actually matter since we just need a stable
478 * order for the RB tree.
479 */
480 static int be32_lt(__be32 a, __be32 b)
481 {
482 return (__force u32) a < (__force u32) b;
483 }
484
485 static int be32_gt(__be32 a, __be32 b)
486 {
487 return (__force u32) a > (__force u32) b;
488 }
489
490 static int be64_lt(__be64 a, __be64 b)
491 {
492 return (__force u64) a < (__force u64) b;
493 }
494
495 static int be64_gt(__be64 a, __be64 b)
496 {
497 return (__force u64) a > (__force u64) b;
498 }
499
500 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
501 {
502 struct rb_node **link = &cm.listen_service_table.rb_node;
503 struct rb_node *parent = NULL;
504 struct cm_id_private *cur_cm_id_priv;
505 __be64 service_id = cm_id_priv->id.service_id;
506 __be64 service_mask = cm_id_priv->id.service_mask;
507 int data_cmp;
508
509 while (*link) {
510 parent = *link;
511 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
512 service_node);
513 data_cmp = cm_compare_data(cm_id_priv->compare_data,
514 cur_cm_id_priv->compare_data);
515 if ((cur_cm_id_priv->id.service_mask & service_id) ==
516 (service_mask & cur_cm_id_priv->id.service_id) &&
517 (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
518 !data_cmp)
519 return cur_cm_id_priv;
520
521 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
522 link = &(*link)->rb_left;
523 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
524 link = &(*link)->rb_right;
525 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
526 link = &(*link)->rb_left;
527 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
528 link = &(*link)->rb_right;
529 else if (data_cmp < 0)
530 link = &(*link)->rb_left;
531 else
532 link = &(*link)->rb_right;
533 }
534 rb_link_node(&cm_id_priv->service_node, parent, link);
535 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
536 return NULL;
537 }
538
539 static struct cm_id_private * cm_find_listen(struct ib_device *device,
540 __be64 service_id,
541 u8 *private_data)
542 {
543 struct rb_node *node = cm.listen_service_table.rb_node;
544 struct cm_id_private *cm_id_priv;
545 int data_cmp;
546
547 while (node) {
548 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
549 data_cmp = cm_compare_private_data(private_data,
550 cm_id_priv->compare_data);
551 if ((cm_id_priv->id.service_mask & service_id) ==
552 cm_id_priv->id.service_id &&
553 (cm_id_priv->id.device == device) && !data_cmp)
554 return cm_id_priv;
555
556 if (device < cm_id_priv->id.device)
557 node = node->rb_left;
558 else if (device > cm_id_priv->id.device)
559 node = node->rb_right;
560 else if (be64_lt(service_id, cm_id_priv->id.service_id))
561 node = node->rb_left;
562 else if (be64_gt(service_id, cm_id_priv->id.service_id))
563 node = node->rb_right;
564 else if (data_cmp < 0)
565 node = node->rb_left;
566 else
567 node = node->rb_right;
568 }
569 return NULL;
570 }
571
572 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
573 *timewait_info)
574 {
575 struct rb_node **link = &cm.remote_id_table.rb_node;
576 struct rb_node *parent = NULL;
577 struct cm_timewait_info *cur_timewait_info;
578 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
579 __be32 remote_id = timewait_info->work.remote_id;
580
581 while (*link) {
582 parent = *link;
583 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
584 remote_id_node);
585 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
586 link = &(*link)->rb_left;
587 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
588 link = &(*link)->rb_right;
589 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
590 link = &(*link)->rb_left;
591 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
592 link = &(*link)->rb_right;
593 else
594 return cur_timewait_info;
595 }
596 timewait_info->inserted_remote_id = 1;
597 rb_link_node(&timewait_info->remote_id_node, parent, link);
598 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
599 return NULL;
600 }
601
602 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
603 __be32 remote_id)
604 {
605 struct rb_node *node = cm.remote_id_table.rb_node;
606 struct cm_timewait_info *timewait_info;
607
608 while (node) {
609 timewait_info = rb_entry(node, struct cm_timewait_info,
610 remote_id_node);
611 if (be32_lt(remote_id, timewait_info->work.remote_id))
612 node = node->rb_left;
613 else if (be32_gt(remote_id, timewait_info->work.remote_id))
614 node = node->rb_right;
615 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
616 node = node->rb_left;
617 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
618 node = node->rb_right;
619 else
620 return timewait_info;
621 }
622 return NULL;
623 }
624
625 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
626 *timewait_info)
627 {
628 struct rb_node **link = &cm.remote_qp_table.rb_node;
629 struct rb_node *parent = NULL;
630 struct cm_timewait_info *cur_timewait_info;
631 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
632 __be32 remote_qpn = timewait_info->remote_qpn;
633
634 while (*link) {
635 parent = *link;
636 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
637 remote_qp_node);
638 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
639 link = &(*link)->rb_left;
640 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
641 link = &(*link)->rb_right;
642 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
643 link = &(*link)->rb_left;
644 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
645 link = &(*link)->rb_right;
646 else
647 return cur_timewait_info;
648 }
649 timewait_info->inserted_remote_qp = 1;
650 rb_link_node(&timewait_info->remote_qp_node, parent, link);
651 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
652 return NULL;
653 }
654
655 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
656 *cm_id_priv)
657 {
658 struct rb_node **link = &cm.remote_sidr_table.rb_node;
659 struct rb_node *parent = NULL;
660 struct cm_id_private *cur_cm_id_priv;
661 union ib_gid *port_gid = &cm_id_priv->av.dgid;
662 __be32 remote_id = cm_id_priv->id.remote_id;
663
664 while (*link) {
665 parent = *link;
666 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
667 sidr_id_node);
668 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
669 link = &(*link)->rb_left;
670 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
671 link = &(*link)->rb_right;
672 else {
673 int cmp;
674 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
675 sizeof *port_gid);
676 if (cmp < 0)
677 link = &(*link)->rb_left;
678 else if (cmp > 0)
679 link = &(*link)->rb_right;
680 else
681 return cur_cm_id_priv;
682 }
683 }
684 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
685 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
686 return NULL;
687 }
688
689 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
690 enum ib_cm_sidr_status status)
691 {
692 struct ib_cm_sidr_rep_param param;
693
694 memset(&param, 0, sizeof param);
695 param.status = status;
696 ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
697 }
698
699 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
700 ib_cm_handler cm_handler,
701 void *context)
702 {
703 struct cm_id_private *cm_id_priv;
704 int ret;
705
706 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
707 if (!cm_id_priv)
708 return ERR_PTR(-ENOMEM);
709
710 cm_id_priv->id.state = IB_CM_IDLE;
711 cm_id_priv->id.device = device;
712 cm_id_priv->id.cm_handler = cm_handler;
713 cm_id_priv->id.context = context;
714 cm_id_priv->id.remote_cm_qpn = 1;
715 ret = cm_alloc_id(cm_id_priv);
716 if (ret)
717 goto error;
718
719 spin_lock_init(&cm_id_priv->lock);
720 init_completion(&cm_id_priv->comp);
721 INIT_LIST_HEAD(&cm_id_priv->work_list);
722 atomic_set(&cm_id_priv->work_count, -1);
723 atomic_set(&cm_id_priv->refcount, 1);
724 return &cm_id_priv->id;
725
726 error:
727 kfree(cm_id_priv);
728 return ERR_PTR(-ENOMEM);
729 }
730 EXPORT_SYMBOL(ib_create_cm_id);
731
732 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
733 {
734 struct cm_work *work;
735
736 if (list_empty(&cm_id_priv->work_list))
737 return NULL;
738
739 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
740 list_del(&work->list);
741 return work;
742 }
743
744 static void cm_free_work(struct cm_work *work)
745 {
746 if (work->mad_recv_wc)
747 ib_free_recv_mad(work->mad_recv_wc);
748 kfree(work);
749 }
750
751 static inline int cm_convert_to_ms(int iba_time)
752 {
753 /* approximate conversion to ms from 4.096us x 2^iba_time */
754 return 1 << max(iba_time - 8, 0);
755 }
756
757 /*
758 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
759 * Because of how ack_timeout is stored, adding one doubles the timeout.
760 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
761 * increment it (round up) only if the other is within 50%.
762 */
763 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
764 {
765 int ack_timeout = packet_life_time + 1;
766
767 if (ack_timeout >= ca_ack_delay)
768 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
769 else
770 ack_timeout = ca_ack_delay +
771 (ack_timeout >= (ca_ack_delay - 1));
772
773 return min(31, ack_timeout);
774 }
775
776 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
777 {
778 if (timewait_info->inserted_remote_id) {
779 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
780 timewait_info->inserted_remote_id = 0;
781 }
782
783 if (timewait_info->inserted_remote_qp) {
784 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
785 timewait_info->inserted_remote_qp = 0;
786 }
787 }
788
789 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
790 {
791 struct cm_timewait_info *timewait_info;
792
793 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
794 if (!timewait_info)
795 return ERR_PTR(-ENOMEM);
796
797 timewait_info->work.local_id = local_id;
798 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
799 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
800 return timewait_info;
801 }
802
803 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
804 {
805 int wait_time;
806 unsigned long flags;
807
808 spin_lock_irqsave(&cm.lock, flags);
809 cm_cleanup_timewait(cm_id_priv->timewait_info);
810 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
811 spin_unlock_irqrestore(&cm.lock, flags);
812
813 /*
814 * The cm_id could be destroyed by the user before we exit timewait.
815 * To protect against this, we search for the cm_id after exiting
816 * timewait before notifying the user that we've exited timewait.
817 */
818 cm_id_priv->id.state = IB_CM_TIMEWAIT;
819 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
820 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
821 msecs_to_jiffies(wait_time));
822 cm_id_priv->timewait_info = NULL;
823 }
824
825 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
826 {
827 unsigned long flags;
828
829 cm_id_priv->id.state = IB_CM_IDLE;
830 if (cm_id_priv->timewait_info) {
831 spin_lock_irqsave(&cm.lock, flags);
832 cm_cleanup_timewait(cm_id_priv->timewait_info);
833 spin_unlock_irqrestore(&cm.lock, flags);
834 kfree(cm_id_priv->timewait_info);
835 cm_id_priv->timewait_info = NULL;
836 }
837 }
838
839 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
840 {
841 struct cm_id_private *cm_id_priv;
842 struct cm_work *work;
843
844 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
845 retest:
846 spin_lock_irq(&cm_id_priv->lock);
847 switch (cm_id->state) {
848 case IB_CM_LISTEN:
849 cm_id->state = IB_CM_IDLE;
850 spin_unlock_irq(&cm_id_priv->lock);
851 spin_lock_irq(&cm.lock);
852 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
853 spin_unlock_irq(&cm.lock);
854 break;
855 case IB_CM_SIDR_REQ_SENT:
856 cm_id->state = IB_CM_IDLE;
857 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
858 spin_unlock_irq(&cm_id_priv->lock);
859 break;
860 case IB_CM_SIDR_REQ_RCVD:
861 spin_unlock_irq(&cm_id_priv->lock);
862 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
863 spin_lock_irq(&cm.lock);
864 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node))
865 rb_erase(&cm_id_priv->sidr_id_node,
866 &cm.remote_sidr_table);
867 spin_unlock_irq(&cm.lock);
868 break;
869 case IB_CM_REQ_SENT:
870 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
871 spin_unlock_irq(&cm_id_priv->lock);
872 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
873 &cm_id_priv->id.device->node_guid,
874 sizeof cm_id_priv->id.device->node_guid,
875 NULL, 0);
876 break;
877 case IB_CM_REQ_RCVD:
878 if (err == -ENOMEM) {
879 /* Do not reject to allow future retries. */
880 cm_reset_to_idle(cm_id_priv);
881 spin_unlock_irq(&cm_id_priv->lock);
882 } else {
883 spin_unlock_irq(&cm_id_priv->lock);
884 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
885 NULL, 0, NULL, 0);
886 }
887 break;
888 case IB_CM_MRA_REQ_RCVD:
889 case IB_CM_REP_SENT:
890 case IB_CM_MRA_REP_RCVD:
891 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
892 /* Fall through */
893 case IB_CM_MRA_REQ_SENT:
894 case IB_CM_REP_RCVD:
895 case IB_CM_MRA_REP_SENT:
896 spin_unlock_irq(&cm_id_priv->lock);
897 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
898 NULL, 0, NULL, 0);
899 break;
900 case IB_CM_ESTABLISHED:
901 spin_unlock_irq(&cm_id_priv->lock);
902 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT)
903 break;
904 ib_send_cm_dreq(cm_id, NULL, 0);
905 goto retest;
906 case IB_CM_DREQ_SENT:
907 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
908 cm_enter_timewait(cm_id_priv);
909 spin_unlock_irq(&cm_id_priv->lock);
910 break;
911 case IB_CM_DREQ_RCVD:
912 spin_unlock_irq(&cm_id_priv->lock);
913 ib_send_cm_drep(cm_id, NULL, 0);
914 break;
915 default:
916 spin_unlock_irq(&cm_id_priv->lock);
917 break;
918 }
919
920 cm_free_id(cm_id->local_id);
921 cm_deref_id(cm_id_priv);
922 wait_for_completion(&cm_id_priv->comp);
923 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
924 cm_free_work(work);
925 kfree(cm_id_priv->compare_data);
926 kfree(cm_id_priv->private_data);
927 kfree(cm_id_priv);
928 }
929
930 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
931 {
932 cm_destroy_id(cm_id, 0);
933 }
934 EXPORT_SYMBOL(ib_destroy_cm_id);
935
936 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
937 struct ib_cm_compare_data *compare_data)
938 {
939 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
940 unsigned long flags;
941 int ret = 0;
942
943 service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
944 service_id &= service_mask;
945 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
946 (service_id != IB_CM_ASSIGN_SERVICE_ID))
947 return -EINVAL;
948
949 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
950 if (cm_id->state != IB_CM_IDLE)
951 return -EINVAL;
952
953 if (compare_data) {
954 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
955 GFP_KERNEL);
956 if (!cm_id_priv->compare_data)
957 return -ENOMEM;
958 cm_mask_copy(cm_id_priv->compare_data->data,
959 compare_data->data, compare_data->mask);
960 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
961 IB_CM_COMPARE_SIZE);
962 }
963
964 cm_id->state = IB_CM_LISTEN;
965
966 spin_lock_irqsave(&cm.lock, flags);
967 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
968 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
969 cm_id->service_mask = ~cpu_to_be64(0);
970 } else {
971 cm_id->service_id = service_id;
972 cm_id->service_mask = service_mask;
973 }
974 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
975 spin_unlock_irqrestore(&cm.lock, flags);
976
977 if (cur_cm_id_priv) {
978 cm_id->state = IB_CM_IDLE;
979 kfree(cm_id_priv->compare_data);
980 cm_id_priv->compare_data = NULL;
981 ret = -EBUSY;
982 }
983 return ret;
984 }
985 EXPORT_SYMBOL(ib_cm_listen);
986
987 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
988 enum cm_msg_sequence msg_seq)
989 {
990 u64 hi_tid, low_tid;
991
992 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
993 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
994 (msg_seq << 30));
995 return cpu_to_be64(hi_tid | low_tid);
996 }
997
998 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
999 __be16 attr_id, __be64 tid)
1000 {
1001 hdr->base_version = IB_MGMT_BASE_VERSION;
1002 hdr->mgmt_class = IB_MGMT_CLASS_CM;
1003 hdr->class_version = IB_CM_CLASS_VERSION;
1004 hdr->method = IB_MGMT_METHOD_SEND;
1005 hdr->attr_id = attr_id;
1006 hdr->tid = tid;
1007 }
1008
1009 static void cm_format_req(struct cm_req_msg *req_msg,
1010 struct cm_id_private *cm_id_priv,
1011 struct ib_cm_req_param *param)
1012 {
1013 struct ib_sa_path_rec *pri_path = param->primary_path;
1014 struct ib_sa_path_rec *alt_path = param->alternate_path;
1015
1016 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1017 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
1018
1019 req_msg->local_comm_id = cm_id_priv->id.local_id;
1020 req_msg->service_id = param->service_id;
1021 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1022 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
1023 cm_req_set_init_depth(req_msg, param->initiator_depth);
1024 cm_req_set_remote_resp_timeout(req_msg,
1025 param->remote_cm_response_timeout);
1026 cm_req_set_qp_type(req_msg, param->qp_type);
1027 cm_req_set_flow_ctrl(req_msg, param->flow_control);
1028 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
1029 cm_req_set_local_resp_timeout(req_msg,
1030 param->local_cm_response_timeout);
1031 req_msg->pkey = param->primary_path->pkey;
1032 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
1033 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
1034
1035 if (param->qp_type != IB_QPT_XRC_INI) {
1036 cm_req_set_resp_res(req_msg, param->responder_resources);
1037 cm_req_set_retry_count(req_msg, param->retry_count);
1038 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
1039 cm_req_set_srq(req_msg, param->srq);
1040 }
1041
1042 if (pri_path->hop_limit <= 1) {
1043 req_msg->primary_local_lid = pri_path->slid;
1044 req_msg->primary_remote_lid = pri_path->dlid;
1045 } else {
1046 /* Work-around until there's a way to obtain remote LID info */
1047 req_msg->primary_local_lid = IB_LID_PERMISSIVE;
1048 req_msg->primary_remote_lid = IB_LID_PERMISSIVE;
1049 }
1050 req_msg->primary_local_gid = pri_path->sgid;
1051 req_msg->primary_remote_gid = pri_path->dgid;
1052 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label);
1053 cm_req_set_primary_packet_rate(req_msg, pri_path->rate);
1054 req_msg->primary_traffic_class = pri_path->traffic_class;
1055 req_msg->primary_hop_limit = pri_path->hop_limit;
1056 cm_req_set_primary_sl(req_msg, pri_path->sl);
1057 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1));
1058 cm_req_set_primary_local_ack_timeout(req_msg,
1059 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1060 pri_path->packet_life_time));
1061
1062 if (alt_path) {
1063 if (alt_path->hop_limit <= 1) {
1064 req_msg->alt_local_lid = alt_path->slid;
1065 req_msg->alt_remote_lid = alt_path->dlid;
1066 } else {
1067 req_msg->alt_local_lid = IB_LID_PERMISSIVE;
1068 req_msg->alt_remote_lid = IB_LID_PERMISSIVE;
1069 }
1070 req_msg->alt_local_gid = alt_path->sgid;
1071 req_msg->alt_remote_gid = alt_path->dgid;
1072 cm_req_set_alt_flow_label(req_msg,
1073 alt_path->flow_label);
1074 cm_req_set_alt_packet_rate(req_msg, alt_path->rate);
1075 req_msg->alt_traffic_class = alt_path->traffic_class;
1076 req_msg->alt_hop_limit = alt_path->hop_limit;
1077 cm_req_set_alt_sl(req_msg, alt_path->sl);
1078 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1));
1079 cm_req_set_alt_local_ack_timeout(req_msg,
1080 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1081 alt_path->packet_life_time));
1082 }
1083
1084 if (param->private_data && param->private_data_len)
1085 memcpy(req_msg->private_data, param->private_data,
1086 param->private_data_len);
1087 }
1088
1089 static int cm_validate_req_param(struct ib_cm_req_param *param)
1090 {
1091 /* peer-to-peer not supported */
1092 if (param->peer_to_peer)
1093 return -EINVAL;
1094
1095 if (!param->primary_path)
1096 return -EINVAL;
1097
1098 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1099 param->qp_type != IB_QPT_XRC_INI)
1100 return -EINVAL;
1101
1102 if (param->private_data &&
1103 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1104 return -EINVAL;
1105
1106 if (param->alternate_path &&
1107 (param->alternate_path->pkey != param->primary_path->pkey ||
1108 param->alternate_path->mtu != param->primary_path->mtu))
1109 return -EINVAL;
1110
1111 return 0;
1112 }
1113
1114 int ib_send_cm_req(struct ib_cm_id *cm_id,
1115 struct ib_cm_req_param *param)
1116 {
1117 struct cm_id_private *cm_id_priv;
1118 struct cm_req_msg *req_msg;
1119 unsigned long flags;
1120 int ret;
1121
1122 ret = cm_validate_req_param(param);
1123 if (ret)
1124 return ret;
1125
1126 /* Verify that we're not in timewait. */
1127 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1128 spin_lock_irqsave(&cm_id_priv->lock, flags);
1129 if (cm_id->state != IB_CM_IDLE) {
1130 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1131 ret = -EINVAL;
1132 goto out;
1133 }
1134 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1135
1136 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1137 id.local_id);
1138 if (IS_ERR(cm_id_priv->timewait_info)) {
1139 ret = PTR_ERR(cm_id_priv->timewait_info);
1140 goto out;
1141 }
1142
1143 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
1144 if (ret)
1145 goto error1;
1146 if (param->alternate_path) {
1147 ret = cm_init_av_by_path(param->alternate_path,
1148 &cm_id_priv->alt_av);
1149 if (ret)
1150 goto error1;
1151 }
1152 cm_id->service_id = param->service_id;
1153 cm_id->service_mask = ~cpu_to_be64(0);
1154 cm_id_priv->timeout_ms = cm_convert_to_ms(
1155 param->primary_path->packet_life_time) * 2 +
1156 cm_convert_to_ms(
1157 param->remote_cm_response_timeout);
1158 cm_id_priv->max_cm_retries = param->max_cm_retries;
1159 cm_id_priv->initiator_depth = param->initiator_depth;
1160 cm_id_priv->responder_resources = param->responder_resources;
1161 cm_id_priv->retry_count = param->retry_count;
1162 cm_id_priv->path_mtu = param->primary_path->mtu;
1163 cm_id_priv->pkey = param->primary_path->pkey;
1164 cm_id_priv->qp_type = param->qp_type;
1165
1166 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1167 if (ret)
1168 goto error1;
1169
1170 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1171 cm_format_req(req_msg, cm_id_priv, param);
1172 cm_id_priv->tid = req_msg->hdr.tid;
1173 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1174 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1175
1176 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1177 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1178
1179 spin_lock_irqsave(&cm_id_priv->lock, flags);
1180 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1181 if (ret) {
1182 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1183 goto error2;
1184 }
1185 BUG_ON(cm_id->state != IB_CM_IDLE);
1186 cm_id->state = IB_CM_REQ_SENT;
1187 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1188 return 0;
1189
1190 error2: cm_free_msg(cm_id_priv->msg);
1191 error1: kfree(cm_id_priv->timewait_info);
1192 out: return ret;
1193 }
1194 EXPORT_SYMBOL(ib_send_cm_req);
1195
1196 static int cm_issue_rej(struct cm_port *port,
1197 struct ib_mad_recv_wc *mad_recv_wc,
1198 enum ib_cm_rej_reason reason,
1199 enum cm_msg_response msg_rejected,
1200 void *ari, u8 ari_length)
1201 {
1202 struct ib_mad_send_buf *msg = NULL;
1203 struct cm_rej_msg *rej_msg, *rcv_msg;
1204 int ret;
1205
1206 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1207 if (ret)
1208 return ret;
1209
1210 /* We just need common CM header information. Cast to any message. */
1211 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1212 rej_msg = (struct cm_rej_msg *) msg->mad;
1213
1214 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1215 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1216 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1217 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1218 rej_msg->reason = cpu_to_be16(reason);
1219
1220 if (ari && ari_length) {
1221 cm_rej_set_reject_info_len(rej_msg, ari_length);
1222 memcpy(rej_msg->ari, ari, ari_length);
1223 }
1224
1225 ret = ib_post_send_mad(msg, NULL);
1226 if (ret)
1227 cm_free_msg(msg);
1228
1229 return ret;
1230 }
1231
1232 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1233 __be32 local_qpn, __be32 remote_qpn)
1234 {
1235 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1236 ((local_ca_guid == remote_ca_guid) &&
1237 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1238 }
1239
1240 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1241 struct ib_sa_path_rec *primary_path,
1242 struct ib_sa_path_rec *alt_path)
1243 {
1244 memset(primary_path, 0, sizeof *primary_path);
1245 primary_path->dgid = req_msg->primary_local_gid;
1246 primary_path->sgid = req_msg->primary_remote_gid;
1247 primary_path->dlid = req_msg->primary_local_lid;
1248 primary_path->slid = req_msg->primary_remote_lid;
1249 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1250 primary_path->hop_limit = req_msg->primary_hop_limit;
1251 primary_path->traffic_class = req_msg->primary_traffic_class;
1252 primary_path->reversible = 1;
1253 primary_path->pkey = req_msg->pkey;
1254 primary_path->sl = cm_req_get_primary_sl(req_msg);
1255 primary_path->mtu_selector = IB_SA_EQ;
1256 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1257 primary_path->rate_selector = IB_SA_EQ;
1258 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1259 primary_path->packet_life_time_selector = IB_SA_EQ;
1260 primary_path->packet_life_time =
1261 cm_req_get_primary_local_ack_timeout(req_msg);
1262 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1263
1264 if (req_msg->alt_local_lid) {
1265 memset(alt_path, 0, sizeof *alt_path);
1266 alt_path->dgid = req_msg->alt_local_gid;
1267 alt_path->sgid = req_msg->alt_remote_gid;
1268 alt_path->dlid = req_msg->alt_local_lid;
1269 alt_path->slid = req_msg->alt_remote_lid;
1270 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1271 alt_path->hop_limit = req_msg->alt_hop_limit;
1272 alt_path->traffic_class = req_msg->alt_traffic_class;
1273 alt_path->reversible = 1;
1274 alt_path->pkey = req_msg->pkey;
1275 alt_path->sl = cm_req_get_alt_sl(req_msg);
1276 alt_path->mtu_selector = IB_SA_EQ;
1277 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1278 alt_path->rate_selector = IB_SA_EQ;
1279 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1280 alt_path->packet_life_time_selector = IB_SA_EQ;
1281 alt_path->packet_life_time =
1282 cm_req_get_alt_local_ack_timeout(req_msg);
1283 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1284 }
1285 }
1286
1287 static void cm_format_req_event(struct cm_work *work,
1288 struct cm_id_private *cm_id_priv,
1289 struct ib_cm_id *listen_id)
1290 {
1291 struct cm_req_msg *req_msg;
1292 struct ib_cm_req_event_param *param;
1293
1294 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1295 param = &work->cm_event.param.req_rcvd;
1296 param->listen_id = listen_id;
1297 param->port = cm_id_priv->av.port->port_num;
1298 param->primary_path = &work->path[0];
1299 if (req_msg->alt_local_lid)
1300 param->alternate_path = &work->path[1];
1301 else
1302 param->alternate_path = NULL;
1303 param->remote_ca_guid = req_msg->local_ca_guid;
1304 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1305 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1306 param->qp_type = cm_req_get_qp_type(req_msg);
1307 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1308 param->responder_resources = cm_req_get_init_depth(req_msg);
1309 param->initiator_depth = cm_req_get_resp_res(req_msg);
1310 param->local_cm_response_timeout =
1311 cm_req_get_remote_resp_timeout(req_msg);
1312 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1313 param->remote_cm_response_timeout =
1314 cm_req_get_local_resp_timeout(req_msg);
1315 param->retry_count = cm_req_get_retry_count(req_msg);
1316 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1317 param->srq = cm_req_get_srq(req_msg);
1318 work->cm_event.private_data = &req_msg->private_data;
1319 }
1320
1321 static void cm_process_work(struct cm_id_private *cm_id_priv,
1322 struct cm_work *work)
1323 {
1324 int ret;
1325
1326 /* We will typically only have the current event to report. */
1327 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1328 cm_free_work(work);
1329
1330 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1331 spin_lock_irq(&cm_id_priv->lock);
1332 work = cm_dequeue_work(cm_id_priv);
1333 spin_unlock_irq(&cm_id_priv->lock);
1334 BUG_ON(!work);
1335 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1336 &work->cm_event);
1337 cm_free_work(work);
1338 }
1339 cm_deref_id(cm_id_priv);
1340 if (ret)
1341 cm_destroy_id(&cm_id_priv->id, ret);
1342 }
1343
1344 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1345 struct cm_id_private *cm_id_priv,
1346 enum cm_msg_response msg_mraed, u8 service_timeout,
1347 const void *private_data, u8 private_data_len)
1348 {
1349 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1350 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1351 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1352 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1353 cm_mra_set_service_timeout(mra_msg, service_timeout);
1354
1355 if (private_data && private_data_len)
1356 memcpy(mra_msg->private_data, private_data, private_data_len);
1357 }
1358
1359 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1360 struct cm_id_private *cm_id_priv,
1361 enum ib_cm_rej_reason reason,
1362 void *ari,
1363 u8 ari_length,
1364 const void *private_data,
1365 u8 private_data_len)
1366 {
1367 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1368 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1369
1370 switch(cm_id_priv->id.state) {
1371 case IB_CM_REQ_RCVD:
1372 rej_msg->local_comm_id = 0;
1373 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1374 break;
1375 case IB_CM_MRA_REQ_SENT:
1376 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1377 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1378 break;
1379 case IB_CM_REP_RCVD:
1380 case IB_CM_MRA_REP_SENT:
1381 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1382 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1383 break;
1384 default:
1385 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1386 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1387 break;
1388 }
1389
1390 rej_msg->reason = cpu_to_be16(reason);
1391 if (ari && ari_length) {
1392 cm_rej_set_reject_info_len(rej_msg, ari_length);
1393 memcpy(rej_msg->ari, ari, ari_length);
1394 }
1395
1396 if (private_data && private_data_len)
1397 memcpy(rej_msg->private_data, private_data, private_data_len);
1398 }
1399
1400 static void cm_dup_req_handler(struct cm_work *work,
1401 struct cm_id_private *cm_id_priv)
1402 {
1403 struct ib_mad_send_buf *msg = NULL;
1404 int ret;
1405
1406 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1407 counter[CM_REQ_COUNTER]);
1408
1409 /* Quick state check to discard duplicate REQs. */
1410 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1411 return;
1412
1413 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1414 if (ret)
1415 return;
1416
1417 spin_lock_irq(&cm_id_priv->lock);
1418 switch (cm_id_priv->id.state) {
1419 case IB_CM_MRA_REQ_SENT:
1420 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1421 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1422 cm_id_priv->private_data,
1423 cm_id_priv->private_data_len);
1424 break;
1425 case IB_CM_TIMEWAIT:
1426 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1427 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1428 break;
1429 default:
1430 goto unlock;
1431 }
1432 spin_unlock_irq(&cm_id_priv->lock);
1433
1434 ret = ib_post_send_mad(msg, NULL);
1435 if (ret)
1436 goto free;
1437 return;
1438
1439 unlock: spin_unlock_irq(&cm_id_priv->lock);
1440 free: cm_free_msg(msg);
1441 }
1442
1443 static struct cm_id_private * cm_match_req(struct cm_work *work,
1444 struct cm_id_private *cm_id_priv)
1445 {
1446 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1447 struct cm_timewait_info *timewait_info;
1448 struct cm_req_msg *req_msg;
1449
1450 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1451
1452 /* Check for possible duplicate REQ. */
1453 spin_lock_irq(&cm.lock);
1454 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1455 if (timewait_info) {
1456 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1457 timewait_info->work.remote_id);
1458 spin_unlock_irq(&cm.lock);
1459 if (cur_cm_id_priv) {
1460 cm_dup_req_handler(work, cur_cm_id_priv);
1461 cm_deref_id(cur_cm_id_priv);
1462 }
1463 return NULL;
1464 }
1465
1466 /* Check for stale connections. */
1467 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1468 if (timewait_info) {
1469 cm_cleanup_timewait(cm_id_priv->timewait_info);
1470 spin_unlock_irq(&cm.lock);
1471 cm_issue_rej(work->port, work->mad_recv_wc,
1472 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1473 NULL, 0);
1474 return NULL;
1475 }
1476
1477 /* Find matching listen request. */
1478 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1479 req_msg->service_id,
1480 req_msg->private_data);
1481 if (!listen_cm_id_priv) {
1482 cm_cleanup_timewait(cm_id_priv->timewait_info);
1483 spin_unlock_irq(&cm.lock);
1484 cm_issue_rej(work->port, work->mad_recv_wc,
1485 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1486 NULL, 0);
1487 goto out;
1488 }
1489 atomic_inc(&listen_cm_id_priv->refcount);
1490 atomic_inc(&cm_id_priv->refcount);
1491 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1492 atomic_inc(&cm_id_priv->work_count);
1493 spin_unlock_irq(&cm.lock);
1494 out:
1495 return listen_cm_id_priv;
1496 }
1497
1498 /*
1499 * Work-around for inter-subnet connections. If the LIDs are permissive,
1500 * we need to override the LID/SL data in the REQ with the LID information
1501 * in the work completion.
1502 */
1503 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
1504 {
1505 if (!cm_req_get_primary_subnet_local(req_msg)) {
1506 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) {
1507 req_msg->primary_local_lid = cpu_to_be16(wc->slid);
1508 cm_req_set_primary_sl(req_msg, wc->sl);
1509 }
1510
1511 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE)
1512 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1513 }
1514
1515 if (!cm_req_get_alt_subnet_local(req_msg)) {
1516 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) {
1517 req_msg->alt_local_lid = cpu_to_be16(wc->slid);
1518 cm_req_set_alt_sl(req_msg, wc->sl);
1519 }
1520
1521 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE)
1522 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1523 }
1524 }
1525
1526 static int cm_req_handler(struct cm_work *work)
1527 {
1528 struct ib_cm_id *cm_id;
1529 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1530 struct cm_req_msg *req_msg;
1531 int ret;
1532
1533 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1534
1535 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
1536 if (IS_ERR(cm_id))
1537 return PTR_ERR(cm_id);
1538
1539 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1540 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1541 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1542 work->mad_recv_wc->recv_buf.grh,
1543 &cm_id_priv->av);
1544 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1545 id.local_id);
1546 if (IS_ERR(cm_id_priv->timewait_info)) {
1547 ret = PTR_ERR(cm_id_priv->timewait_info);
1548 goto destroy;
1549 }
1550 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1551 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1552 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1553
1554 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1555 if (!listen_cm_id_priv) {
1556 ret = -EINVAL;
1557 kfree(cm_id_priv->timewait_info);
1558 goto destroy;
1559 }
1560
1561 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1562 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1563 cm_id_priv->id.service_id = req_msg->service_id;
1564 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1565
1566 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
1567 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1568
1569 memcpy(work->path[0].dmac, cm_id_priv->av.ah_attr.dmac, ETH_ALEN);
1570 work->path[0].vlan_id = cm_id_priv->av.ah_attr.vlan_id;
1571 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1572 if (ret) {
1573 ib_get_cached_gid(work->port->cm_dev->ib_device,
1574 work->port->port_num, 0, &work->path[0].sgid);
1575 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1576 &work->path[0].sgid, sizeof work->path[0].sgid,
1577 NULL, 0);
1578 goto rejected;
1579 }
1580 if (req_msg->alt_local_lid) {
1581 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1582 if (ret) {
1583 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1584 &work->path[0].sgid,
1585 sizeof work->path[0].sgid, NULL, 0);
1586 goto rejected;
1587 }
1588 }
1589 cm_id_priv->tid = req_msg->hdr.tid;
1590 cm_id_priv->timeout_ms = cm_convert_to_ms(
1591 cm_req_get_local_resp_timeout(req_msg));
1592 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1593 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1594 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1595 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1596 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1597 cm_id_priv->pkey = req_msg->pkey;
1598 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1599 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1600 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1601 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1602
1603 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1604 cm_process_work(cm_id_priv, work);
1605 cm_deref_id(listen_cm_id_priv);
1606 return 0;
1607
1608 rejected:
1609 atomic_dec(&cm_id_priv->refcount);
1610 cm_deref_id(listen_cm_id_priv);
1611 destroy:
1612 ib_destroy_cm_id(cm_id);
1613 return ret;
1614 }
1615
1616 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1617 struct cm_id_private *cm_id_priv,
1618 struct ib_cm_rep_param *param)
1619 {
1620 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1621 rep_msg->local_comm_id = cm_id_priv->id.local_id;
1622 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1623 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1624 rep_msg->resp_resources = param->responder_resources;
1625 cm_rep_set_target_ack_delay(rep_msg,
1626 cm_id_priv->av.port->cm_dev->ack_delay);
1627 cm_rep_set_failover(rep_msg, param->failover_accepted);
1628 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1629 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1630
1631 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
1632 rep_msg->initiator_depth = param->initiator_depth;
1633 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1634 cm_rep_set_srq(rep_msg, param->srq);
1635 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1636 } else {
1637 cm_rep_set_srq(rep_msg, 1);
1638 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num));
1639 }
1640
1641 if (param->private_data && param->private_data_len)
1642 memcpy(rep_msg->private_data, param->private_data,
1643 param->private_data_len);
1644 }
1645
1646 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1647 struct ib_cm_rep_param *param)
1648 {
1649 struct cm_id_private *cm_id_priv;
1650 struct ib_mad_send_buf *msg;
1651 struct cm_rep_msg *rep_msg;
1652 unsigned long flags;
1653 int ret;
1654
1655 if (param->private_data &&
1656 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1657 return -EINVAL;
1658
1659 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1660 spin_lock_irqsave(&cm_id_priv->lock, flags);
1661 if (cm_id->state != IB_CM_REQ_RCVD &&
1662 cm_id->state != IB_CM_MRA_REQ_SENT) {
1663 ret = -EINVAL;
1664 goto out;
1665 }
1666
1667 ret = cm_alloc_msg(cm_id_priv, &msg);
1668 if (ret)
1669 goto out;
1670
1671 rep_msg = (struct cm_rep_msg *) msg->mad;
1672 cm_format_rep(rep_msg, cm_id_priv, param);
1673 msg->timeout_ms = cm_id_priv->timeout_ms;
1674 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1675
1676 ret = ib_post_send_mad(msg, NULL);
1677 if (ret) {
1678 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1679 cm_free_msg(msg);
1680 return ret;
1681 }
1682
1683 cm_id->state = IB_CM_REP_SENT;
1684 cm_id_priv->msg = msg;
1685 cm_id_priv->initiator_depth = param->initiator_depth;
1686 cm_id_priv->responder_resources = param->responder_resources;
1687 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1688 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
1689
1690 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1691 return ret;
1692 }
1693 EXPORT_SYMBOL(ib_send_cm_rep);
1694
1695 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1696 struct cm_id_private *cm_id_priv,
1697 const void *private_data,
1698 u8 private_data_len)
1699 {
1700 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1701 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1702 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1703
1704 if (private_data && private_data_len)
1705 memcpy(rtu_msg->private_data, private_data, private_data_len);
1706 }
1707
1708 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1709 const void *private_data,
1710 u8 private_data_len)
1711 {
1712 struct cm_id_private *cm_id_priv;
1713 struct ib_mad_send_buf *msg;
1714 unsigned long flags;
1715 void *data;
1716 int ret;
1717
1718 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1719 return -EINVAL;
1720
1721 data = cm_copy_private_data(private_data, private_data_len);
1722 if (IS_ERR(data))
1723 return PTR_ERR(data);
1724
1725 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1726 spin_lock_irqsave(&cm_id_priv->lock, flags);
1727 if (cm_id->state != IB_CM_REP_RCVD &&
1728 cm_id->state != IB_CM_MRA_REP_SENT) {
1729 ret = -EINVAL;
1730 goto error;
1731 }
1732
1733 ret = cm_alloc_msg(cm_id_priv, &msg);
1734 if (ret)
1735 goto error;
1736
1737 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1738 private_data, private_data_len);
1739
1740 ret = ib_post_send_mad(msg, NULL);
1741 if (ret) {
1742 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1743 cm_free_msg(msg);
1744 kfree(data);
1745 return ret;
1746 }
1747
1748 cm_id->state = IB_CM_ESTABLISHED;
1749 cm_set_private_data(cm_id_priv, data, private_data_len);
1750 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1751 return 0;
1752
1753 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1754 kfree(data);
1755 return ret;
1756 }
1757 EXPORT_SYMBOL(ib_send_cm_rtu);
1758
1759 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
1760 {
1761 struct cm_rep_msg *rep_msg;
1762 struct ib_cm_rep_event_param *param;
1763
1764 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1765 param = &work->cm_event.param.rep_rcvd;
1766 param->remote_ca_guid = rep_msg->local_ca_guid;
1767 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1768 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
1769 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1770 param->responder_resources = rep_msg->initiator_depth;
1771 param->initiator_depth = rep_msg->resp_resources;
1772 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1773 param->failover_accepted = cm_rep_get_failover(rep_msg);
1774 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1775 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1776 param->srq = cm_rep_get_srq(rep_msg);
1777 work->cm_event.private_data = &rep_msg->private_data;
1778 }
1779
1780 static void cm_dup_rep_handler(struct cm_work *work)
1781 {
1782 struct cm_id_private *cm_id_priv;
1783 struct cm_rep_msg *rep_msg;
1784 struct ib_mad_send_buf *msg = NULL;
1785 int ret;
1786
1787 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1788 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1789 rep_msg->local_comm_id);
1790 if (!cm_id_priv)
1791 return;
1792
1793 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1794 counter[CM_REP_COUNTER]);
1795 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1796 if (ret)
1797 goto deref;
1798
1799 spin_lock_irq(&cm_id_priv->lock);
1800 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1801 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1802 cm_id_priv->private_data,
1803 cm_id_priv->private_data_len);
1804 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1805 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1806 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1807 cm_id_priv->private_data,
1808 cm_id_priv->private_data_len);
1809 else
1810 goto unlock;
1811 spin_unlock_irq(&cm_id_priv->lock);
1812
1813 ret = ib_post_send_mad(msg, NULL);
1814 if (ret)
1815 goto free;
1816 goto deref;
1817
1818 unlock: spin_unlock_irq(&cm_id_priv->lock);
1819 free: cm_free_msg(msg);
1820 deref: cm_deref_id(cm_id_priv);
1821 }
1822
1823 static int cm_rep_handler(struct cm_work *work)
1824 {
1825 struct cm_id_private *cm_id_priv;
1826 struct cm_rep_msg *rep_msg;
1827 int ret;
1828
1829 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1830 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1831 if (!cm_id_priv) {
1832 cm_dup_rep_handler(work);
1833 return -EINVAL;
1834 }
1835
1836 cm_format_rep_event(work, cm_id_priv->qp_type);
1837
1838 spin_lock_irq(&cm_id_priv->lock);
1839 switch (cm_id_priv->id.state) {
1840 case IB_CM_REQ_SENT:
1841 case IB_CM_MRA_REQ_RCVD:
1842 break;
1843 default:
1844 spin_unlock_irq(&cm_id_priv->lock);
1845 ret = -EINVAL;
1846 goto error;
1847 }
1848
1849 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1850 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1851 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
1852
1853 spin_lock(&cm.lock);
1854 /* Check for duplicate REP. */
1855 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1856 spin_unlock(&cm.lock);
1857 spin_unlock_irq(&cm_id_priv->lock);
1858 ret = -EINVAL;
1859 goto error;
1860 }
1861 /* Check for a stale connection. */
1862 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1863 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1864 &cm.remote_id_table);
1865 cm_id_priv->timewait_info->inserted_remote_id = 0;
1866 spin_unlock(&cm.lock);
1867 spin_unlock_irq(&cm_id_priv->lock);
1868 cm_issue_rej(work->port, work->mad_recv_wc,
1869 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1870 NULL, 0);
1871 ret = -EINVAL;
1872 goto error;
1873 }
1874 spin_unlock(&cm.lock);
1875
1876 cm_id_priv->id.state = IB_CM_REP_RCVD;
1877 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1878 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
1879 cm_id_priv->initiator_depth = rep_msg->resp_resources;
1880 cm_id_priv->responder_resources = rep_msg->initiator_depth;
1881 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1882 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1883 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1884 cm_id_priv->av.timeout =
1885 cm_ack_timeout(cm_id_priv->target_ack_delay,
1886 cm_id_priv->av.timeout - 1);
1887 cm_id_priv->alt_av.timeout =
1888 cm_ack_timeout(cm_id_priv->target_ack_delay,
1889 cm_id_priv->alt_av.timeout - 1);
1890
1891 /* todo: handle peer_to_peer */
1892
1893 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1894 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1895 if (!ret)
1896 list_add_tail(&work->list, &cm_id_priv->work_list);
1897 spin_unlock_irq(&cm_id_priv->lock);
1898
1899 if (ret)
1900 cm_process_work(cm_id_priv, work);
1901 else
1902 cm_deref_id(cm_id_priv);
1903 return 0;
1904
1905 error:
1906 cm_deref_id(cm_id_priv);
1907 return ret;
1908 }
1909
1910 static int cm_establish_handler(struct cm_work *work)
1911 {
1912 struct cm_id_private *cm_id_priv;
1913 int ret;
1914
1915 /* See comment in cm_establish about lookup. */
1916 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1917 if (!cm_id_priv)
1918 return -EINVAL;
1919
1920 spin_lock_irq(&cm_id_priv->lock);
1921 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1922 spin_unlock_irq(&cm_id_priv->lock);
1923 goto out;
1924 }
1925
1926 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1927 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1928 if (!ret)
1929 list_add_tail(&work->list, &cm_id_priv->work_list);
1930 spin_unlock_irq(&cm_id_priv->lock);
1931
1932 if (ret)
1933 cm_process_work(cm_id_priv, work);
1934 else
1935 cm_deref_id(cm_id_priv);
1936 return 0;
1937 out:
1938 cm_deref_id(cm_id_priv);
1939 return -EINVAL;
1940 }
1941
1942 static int cm_rtu_handler(struct cm_work *work)
1943 {
1944 struct cm_id_private *cm_id_priv;
1945 struct cm_rtu_msg *rtu_msg;
1946 int ret;
1947
1948 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1949 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1950 rtu_msg->local_comm_id);
1951 if (!cm_id_priv)
1952 return -EINVAL;
1953
1954 work->cm_event.private_data = &rtu_msg->private_data;
1955
1956 spin_lock_irq(&cm_id_priv->lock);
1957 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1958 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1959 spin_unlock_irq(&cm_id_priv->lock);
1960 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1961 counter[CM_RTU_COUNTER]);
1962 goto out;
1963 }
1964 cm_id_priv->id.state = IB_CM_ESTABLISHED;
1965
1966 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1967 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1968 if (!ret)
1969 list_add_tail(&work->list, &cm_id_priv->work_list);
1970 spin_unlock_irq(&cm_id_priv->lock);
1971
1972 if (ret)
1973 cm_process_work(cm_id_priv, work);
1974 else
1975 cm_deref_id(cm_id_priv);
1976 return 0;
1977 out:
1978 cm_deref_id(cm_id_priv);
1979 return -EINVAL;
1980 }
1981
1982 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1983 struct cm_id_private *cm_id_priv,
1984 const void *private_data,
1985 u8 private_data_len)
1986 {
1987 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1988 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1989 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1990 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1991 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1992
1993 if (private_data && private_data_len)
1994 memcpy(dreq_msg->private_data, private_data, private_data_len);
1995 }
1996
1997 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1998 const void *private_data,
1999 u8 private_data_len)
2000 {
2001 struct cm_id_private *cm_id_priv;
2002 struct ib_mad_send_buf *msg;
2003 unsigned long flags;
2004 int ret;
2005
2006 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
2007 return -EINVAL;
2008
2009 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2010 spin_lock_irqsave(&cm_id_priv->lock, flags);
2011 if (cm_id->state != IB_CM_ESTABLISHED) {
2012 ret = -EINVAL;
2013 goto out;
2014 }
2015
2016 if (cm_id->lap_state == IB_CM_LAP_SENT ||
2017 cm_id->lap_state == IB_CM_MRA_LAP_RCVD)
2018 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2019
2020 ret = cm_alloc_msg(cm_id_priv, &msg);
2021 if (ret) {
2022 cm_enter_timewait(cm_id_priv);
2023 goto out;
2024 }
2025
2026 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2027 private_data, private_data_len);
2028 msg->timeout_ms = cm_id_priv->timeout_ms;
2029 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2030
2031 ret = ib_post_send_mad(msg, NULL);
2032 if (ret) {
2033 cm_enter_timewait(cm_id_priv);
2034 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2035 cm_free_msg(msg);
2036 return ret;
2037 }
2038
2039 cm_id->state = IB_CM_DREQ_SENT;
2040 cm_id_priv->msg = msg;
2041 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2042 return ret;
2043 }
2044 EXPORT_SYMBOL(ib_send_cm_dreq);
2045
2046 static void cm_format_drep(struct cm_drep_msg *drep_msg,
2047 struct cm_id_private *cm_id_priv,
2048 const void *private_data,
2049 u8 private_data_len)
2050 {
2051 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2052 drep_msg->local_comm_id = cm_id_priv->id.local_id;
2053 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2054
2055 if (private_data && private_data_len)
2056 memcpy(drep_msg->private_data, private_data, private_data_len);
2057 }
2058
2059 int ib_send_cm_drep(struct ib_cm_id *cm_id,
2060 const void *private_data,
2061 u8 private_data_len)
2062 {
2063 struct cm_id_private *cm_id_priv;
2064 struct ib_mad_send_buf *msg;
2065 unsigned long flags;
2066 void *data;
2067 int ret;
2068
2069 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2070 return -EINVAL;
2071
2072 data = cm_copy_private_data(private_data, private_data_len);
2073 if (IS_ERR(data))
2074 return PTR_ERR(data);
2075
2076 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2077 spin_lock_irqsave(&cm_id_priv->lock, flags);
2078 if (cm_id->state != IB_CM_DREQ_RCVD) {
2079 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2080 kfree(data);
2081 return -EINVAL;
2082 }
2083
2084 cm_set_private_data(cm_id_priv, data, private_data_len);
2085 cm_enter_timewait(cm_id_priv);
2086
2087 ret = cm_alloc_msg(cm_id_priv, &msg);
2088 if (ret)
2089 goto out;
2090
2091 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2092 private_data, private_data_len);
2093
2094 ret = ib_post_send_mad(msg, NULL);
2095 if (ret) {
2096 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2097 cm_free_msg(msg);
2098 return ret;
2099 }
2100
2101 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2102 return ret;
2103 }
2104 EXPORT_SYMBOL(ib_send_cm_drep);
2105
2106 static int cm_issue_drep(struct cm_port *port,
2107 struct ib_mad_recv_wc *mad_recv_wc)
2108 {
2109 struct ib_mad_send_buf *msg = NULL;
2110 struct cm_dreq_msg *dreq_msg;
2111 struct cm_drep_msg *drep_msg;
2112 int ret;
2113
2114 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2115 if (ret)
2116 return ret;
2117
2118 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2119 drep_msg = (struct cm_drep_msg *) msg->mad;
2120
2121 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2122 drep_msg->remote_comm_id = dreq_msg->local_comm_id;
2123 drep_msg->local_comm_id = dreq_msg->remote_comm_id;
2124
2125 ret = ib_post_send_mad(msg, NULL);
2126 if (ret)
2127 cm_free_msg(msg);
2128
2129 return ret;
2130 }
2131
2132 static int cm_dreq_handler(struct cm_work *work)
2133 {
2134 struct cm_id_private *cm_id_priv;
2135 struct cm_dreq_msg *dreq_msg;
2136 struct ib_mad_send_buf *msg = NULL;
2137 int ret;
2138
2139 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2140 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
2141 dreq_msg->local_comm_id);
2142 if (!cm_id_priv) {
2143 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2144 counter[CM_DREQ_COUNTER]);
2145 cm_issue_drep(work->port, work->mad_recv_wc);
2146 return -EINVAL;
2147 }
2148
2149 work->cm_event.private_data = &dreq_msg->private_data;
2150
2151 spin_lock_irq(&cm_id_priv->lock);
2152 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
2153 goto unlock;
2154
2155 switch (cm_id_priv->id.state) {
2156 case IB_CM_REP_SENT:
2157 case IB_CM_DREQ_SENT:
2158 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2159 break;
2160 case IB_CM_ESTABLISHED:
2161 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2162 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2163 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2164 break;
2165 case IB_CM_MRA_REP_RCVD:
2166 break;
2167 case IB_CM_TIMEWAIT:
2168 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2169 counter[CM_DREQ_COUNTER]);
2170 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2171 goto unlock;
2172
2173 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2174 cm_id_priv->private_data,
2175 cm_id_priv->private_data_len);
2176 spin_unlock_irq(&cm_id_priv->lock);
2177
2178 if (ib_post_send_mad(msg, NULL))
2179 cm_free_msg(msg);
2180 goto deref;
2181 case IB_CM_DREQ_RCVD:
2182 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2183 counter[CM_DREQ_COUNTER]);
2184 goto unlock;
2185 default:
2186 goto unlock;
2187 }
2188 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2189 cm_id_priv->tid = dreq_msg->hdr.tid;
2190 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2191 if (!ret)
2192 list_add_tail(&work->list, &cm_id_priv->work_list);
2193 spin_unlock_irq(&cm_id_priv->lock);
2194
2195 if (ret)
2196 cm_process_work(cm_id_priv, work);
2197 else
2198 cm_deref_id(cm_id_priv);
2199 return 0;
2200
2201 unlock: spin_unlock_irq(&cm_id_priv->lock);
2202 deref: cm_deref_id(cm_id_priv);
2203 return -EINVAL;
2204 }
2205
2206 static int cm_drep_handler(struct cm_work *work)
2207 {
2208 struct cm_id_private *cm_id_priv;
2209 struct cm_drep_msg *drep_msg;
2210 int ret;
2211
2212 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2213 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2214 drep_msg->local_comm_id);
2215 if (!cm_id_priv)
2216 return -EINVAL;
2217
2218 work->cm_event.private_data = &drep_msg->private_data;
2219
2220 spin_lock_irq(&cm_id_priv->lock);
2221 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2222 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2223 spin_unlock_irq(&cm_id_priv->lock);
2224 goto out;
2225 }
2226 cm_enter_timewait(cm_id_priv);
2227
2228 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2229 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2230 if (!ret)
2231 list_add_tail(&work->list, &cm_id_priv->work_list);
2232 spin_unlock_irq(&cm_id_priv->lock);
2233
2234 if (ret)
2235 cm_process_work(cm_id_priv, work);
2236 else
2237 cm_deref_id(cm_id_priv);
2238 return 0;
2239 out:
2240 cm_deref_id(cm_id_priv);
2241 return -EINVAL;
2242 }
2243
2244 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2245 enum ib_cm_rej_reason reason,
2246 void *ari,
2247 u8 ari_length,
2248 const void *private_data,
2249 u8 private_data_len)
2250 {
2251 struct cm_id_private *cm_id_priv;
2252 struct ib_mad_send_buf *msg;
2253 unsigned long flags;
2254 int ret;
2255
2256 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2257 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2258 return -EINVAL;
2259
2260 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2261
2262 spin_lock_irqsave(&cm_id_priv->lock, flags);
2263 switch (cm_id->state) {
2264 case IB_CM_REQ_SENT:
2265 case IB_CM_MRA_REQ_RCVD:
2266 case IB_CM_REQ_RCVD:
2267 case IB_CM_MRA_REQ_SENT:
2268 case IB_CM_REP_RCVD:
2269 case IB_CM_MRA_REP_SENT:
2270 ret = cm_alloc_msg(cm_id_priv, &msg);
2271 if (!ret)
2272 cm_format_rej((struct cm_rej_msg *) msg->mad,
2273 cm_id_priv, reason, ari, ari_length,
2274 private_data, private_data_len);
2275
2276 cm_reset_to_idle(cm_id_priv);
2277 break;
2278 case IB_CM_REP_SENT:
2279 case IB_CM_MRA_REP_RCVD:
2280 ret = cm_alloc_msg(cm_id_priv, &msg);
2281 if (!ret)
2282 cm_format_rej((struct cm_rej_msg *) msg->mad,
2283 cm_id_priv, reason, ari, ari_length,
2284 private_data, private_data_len);
2285
2286 cm_enter_timewait(cm_id_priv);
2287 break;
2288 default:
2289 ret = -EINVAL;
2290 goto out;
2291 }
2292
2293 if (ret)
2294 goto out;
2295
2296 ret = ib_post_send_mad(msg, NULL);
2297 if (ret)
2298 cm_free_msg(msg);
2299
2300 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2301 return ret;
2302 }
2303 EXPORT_SYMBOL(ib_send_cm_rej);
2304
2305 static void cm_format_rej_event(struct cm_work *work)
2306 {
2307 struct cm_rej_msg *rej_msg;
2308 struct ib_cm_rej_event_param *param;
2309
2310 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2311 param = &work->cm_event.param.rej_rcvd;
2312 param->ari = rej_msg->ari;
2313 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2314 param->reason = __be16_to_cpu(rej_msg->reason);
2315 work->cm_event.private_data = &rej_msg->private_data;
2316 }
2317
2318 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2319 {
2320 struct cm_timewait_info *timewait_info;
2321 struct cm_id_private *cm_id_priv;
2322 __be32 remote_id;
2323
2324 remote_id = rej_msg->local_comm_id;
2325
2326 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2327 spin_lock_irq(&cm.lock);
2328 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2329 remote_id);
2330 if (!timewait_info) {
2331 spin_unlock_irq(&cm.lock);
2332 return NULL;
2333 }
2334 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2335 (timewait_info->work.local_id ^
2336 cm.random_id_operand));
2337 if (cm_id_priv) {
2338 if (cm_id_priv->id.remote_id == remote_id)
2339 atomic_inc(&cm_id_priv->refcount);
2340 else
2341 cm_id_priv = NULL;
2342 }
2343 spin_unlock_irq(&cm.lock);
2344 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2345 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2346 else
2347 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2348
2349 return cm_id_priv;
2350 }
2351
2352 static int cm_rej_handler(struct cm_work *work)
2353 {
2354 struct cm_id_private *cm_id_priv;
2355 struct cm_rej_msg *rej_msg;
2356 int ret;
2357
2358 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2359 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2360 if (!cm_id_priv)
2361 return -EINVAL;
2362
2363 cm_format_rej_event(work);
2364
2365 spin_lock_irq(&cm_id_priv->lock);
2366 switch (cm_id_priv->id.state) {
2367 case IB_CM_REQ_SENT:
2368 case IB_CM_MRA_REQ_RCVD:
2369 case IB_CM_REP_SENT:
2370 case IB_CM_MRA_REP_RCVD:
2371 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2372 /* fall through */
2373 case IB_CM_REQ_RCVD:
2374 case IB_CM_MRA_REQ_SENT:
2375 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2376 cm_enter_timewait(cm_id_priv);
2377 else
2378 cm_reset_to_idle(cm_id_priv);
2379 break;
2380 case IB_CM_DREQ_SENT:
2381 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2382 /* fall through */
2383 case IB_CM_REP_RCVD:
2384 case IB_CM_MRA_REP_SENT:
2385 cm_enter_timewait(cm_id_priv);
2386 break;
2387 case IB_CM_ESTABLISHED:
2388 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
2389 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
2390 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
2391 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2392 cm_id_priv->msg);
2393 cm_enter_timewait(cm_id_priv);
2394 break;
2395 }
2396 /* fall through */
2397 default:
2398 spin_unlock_irq(&cm_id_priv->lock);
2399 ret = -EINVAL;
2400 goto out;
2401 }
2402
2403 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2404 if (!ret)
2405 list_add_tail(&work->list, &cm_id_priv->work_list);
2406 spin_unlock_irq(&cm_id_priv->lock);
2407
2408 if (ret)
2409 cm_process_work(cm_id_priv, work);
2410 else
2411 cm_deref_id(cm_id_priv);
2412 return 0;
2413 out:
2414 cm_deref_id(cm_id_priv);
2415 return -EINVAL;
2416 }
2417
2418 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2419 u8 service_timeout,
2420 const void *private_data,
2421 u8 private_data_len)
2422 {
2423 struct cm_id_private *cm_id_priv;
2424 struct ib_mad_send_buf *msg;
2425 enum ib_cm_state cm_state;
2426 enum ib_cm_lap_state lap_state;
2427 enum cm_msg_response msg_response;
2428 void *data;
2429 unsigned long flags;
2430 int ret;
2431
2432 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2433 return -EINVAL;
2434
2435 data = cm_copy_private_data(private_data, private_data_len);
2436 if (IS_ERR(data))
2437 return PTR_ERR(data);
2438
2439 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2440
2441 spin_lock_irqsave(&cm_id_priv->lock, flags);
2442 switch(cm_id_priv->id.state) {
2443 case IB_CM_REQ_RCVD:
2444 cm_state = IB_CM_MRA_REQ_SENT;
2445 lap_state = cm_id->lap_state;
2446 msg_response = CM_MSG_RESPONSE_REQ;
2447 break;
2448 case IB_CM_REP_RCVD:
2449 cm_state = IB_CM_MRA_REP_SENT;
2450 lap_state = cm_id->lap_state;
2451 msg_response = CM_MSG_RESPONSE_REP;
2452 break;
2453 case IB_CM_ESTABLISHED:
2454 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
2455 cm_state = cm_id->state;
2456 lap_state = IB_CM_MRA_LAP_SENT;
2457 msg_response = CM_MSG_RESPONSE_OTHER;
2458 break;
2459 }
2460 default:
2461 ret = -EINVAL;
2462 goto error1;
2463 }
2464
2465 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
2466 ret = cm_alloc_msg(cm_id_priv, &msg);
2467 if (ret)
2468 goto error1;
2469
2470 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2471 msg_response, service_timeout,
2472 private_data, private_data_len);
2473 ret = ib_post_send_mad(msg, NULL);
2474 if (ret)
2475 goto error2;
2476 }
2477
2478 cm_id->state = cm_state;
2479 cm_id->lap_state = lap_state;
2480 cm_id_priv->service_timeout = service_timeout;
2481 cm_set_private_data(cm_id_priv, data, private_data_len);
2482 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2483 return 0;
2484
2485 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2486 kfree(data);
2487 return ret;
2488
2489 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2490 kfree(data);
2491 cm_free_msg(msg);
2492 return ret;
2493 }
2494 EXPORT_SYMBOL(ib_send_cm_mra);
2495
2496 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2497 {
2498 switch (cm_mra_get_msg_mraed(mra_msg)) {
2499 case CM_MSG_RESPONSE_REQ:
2500 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2501 case CM_MSG_RESPONSE_REP:
2502 case CM_MSG_RESPONSE_OTHER:
2503 return cm_acquire_id(mra_msg->remote_comm_id,
2504 mra_msg->local_comm_id);
2505 default:
2506 return NULL;
2507 }
2508 }
2509
2510 static int cm_mra_handler(struct cm_work *work)
2511 {
2512 struct cm_id_private *cm_id_priv;
2513 struct cm_mra_msg *mra_msg;
2514 int timeout, ret;
2515
2516 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2517 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2518 if (!cm_id_priv)
2519 return -EINVAL;
2520
2521 work->cm_event.private_data = &mra_msg->private_data;
2522 work->cm_event.param.mra_rcvd.service_timeout =
2523 cm_mra_get_service_timeout(mra_msg);
2524 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2525 cm_convert_to_ms(cm_id_priv->av.timeout);
2526
2527 spin_lock_irq(&cm_id_priv->lock);
2528 switch (cm_id_priv->id.state) {
2529 case IB_CM_REQ_SENT:
2530 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2531 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2532 cm_id_priv->msg, timeout))
2533 goto out;
2534 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2535 break;
2536 case IB_CM_REP_SENT:
2537 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2538 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2539 cm_id_priv->msg, timeout))
2540 goto out;
2541 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2542 break;
2543 case IB_CM_ESTABLISHED:
2544 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2545 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2546 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2547 cm_id_priv->msg, timeout)) {
2548 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2549 atomic_long_inc(&work->port->
2550 counter_group[CM_RECV_DUPLICATES].
2551 counter[CM_MRA_COUNTER]);
2552 goto out;
2553 }
2554 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2555 break;
2556 case IB_CM_MRA_REQ_RCVD:
2557 case IB_CM_MRA_REP_RCVD:
2558 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2559 counter[CM_MRA_COUNTER]);
2560 /* fall through */
2561 default:
2562 goto out;
2563 }
2564
2565 cm_id_priv->msg->context[1] = (void *) (unsigned long)
2566 cm_id_priv->id.state;
2567 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2568 if (!ret)
2569 list_add_tail(&work->list, &cm_id_priv->work_list);
2570 spin_unlock_irq(&cm_id_priv->lock);
2571
2572 if (ret)
2573 cm_process_work(cm_id_priv, work);
2574 else
2575 cm_deref_id(cm_id_priv);
2576 return 0;
2577 out:
2578 spin_unlock_irq(&cm_id_priv->lock);
2579 cm_deref_id(cm_id_priv);
2580 return -EINVAL;
2581 }
2582
2583 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2584 struct cm_id_private *cm_id_priv,
2585 struct ib_sa_path_rec *alternate_path,
2586 const void *private_data,
2587 u8 private_data_len)
2588 {
2589 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2590 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2591 lap_msg->local_comm_id = cm_id_priv->id.local_id;
2592 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2593 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2594 /* todo: need remote CM response timeout */
2595 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2596 lap_msg->alt_local_lid = alternate_path->slid;
2597 lap_msg->alt_remote_lid = alternate_path->dlid;
2598 lap_msg->alt_local_gid = alternate_path->sgid;
2599 lap_msg->alt_remote_gid = alternate_path->dgid;
2600 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2601 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2602 lap_msg->alt_hop_limit = alternate_path->hop_limit;
2603 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2604 cm_lap_set_sl(lap_msg, alternate_path->sl);
2605 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2606 cm_lap_set_local_ack_timeout(lap_msg,
2607 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
2608 alternate_path->packet_life_time));
2609
2610 if (private_data && private_data_len)
2611 memcpy(lap_msg->private_data, private_data, private_data_len);
2612 }
2613
2614 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2615 struct ib_sa_path_rec *alternate_path,
2616 const void *private_data,
2617 u8 private_data_len)
2618 {
2619 struct cm_id_private *cm_id_priv;
2620 struct ib_mad_send_buf *msg;
2621 unsigned long flags;
2622 int ret;
2623
2624 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2625 return -EINVAL;
2626
2627 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2628 spin_lock_irqsave(&cm_id_priv->lock, flags);
2629 if (cm_id->state != IB_CM_ESTABLISHED ||
2630 (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2631 cm_id->lap_state != IB_CM_LAP_IDLE)) {
2632 ret = -EINVAL;
2633 goto out;
2634 }
2635
2636 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
2637 if (ret)
2638 goto out;
2639 cm_id_priv->alt_av.timeout =
2640 cm_ack_timeout(cm_id_priv->target_ack_delay,
2641 cm_id_priv->alt_av.timeout - 1);
2642
2643 ret = cm_alloc_msg(cm_id_priv, &msg);
2644 if (ret)
2645 goto out;
2646
2647 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2648 alternate_path, private_data, private_data_len);
2649 msg->timeout_ms = cm_id_priv->timeout_ms;
2650 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2651
2652 ret = ib_post_send_mad(msg, NULL);
2653 if (ret) {
2654 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2655 cm_free_msg(msg);
2656 return ret;
2657 }
2658
2659 cm_id->lap_state = IB_CM_LAP_SENT;
2660 cm_id_priv->msg = msg;
2661
2662 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2663 return ret;
2664 }
2665 EXPORT_SYMBOL(ib_send_cm_lap);
2666
2667 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2668 struct ib_sa_path_rec *path,
2669 struct cm_lap_msg *lap_msg)
2670 {
2671 memset(path, 0, sizeof *path);
2672 path->dgid = lap_msg->alt_local_gid;
2673 path->sgid = lap_msg->alt_remote_gid;
2674 path->dlid = lap_msg->alt_local_lid;
2675 path->slid = lap_msg->alt_remote_lid;
2676 path->flow_label = cm_lap_get_flow_label(lap_msg);
2677 path->hop_limit = lap_msg->alt_hop_limit;
2678 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2679 path->reversible = 1;
2680 path->pkey = cm_id_priv->pkey;
2681 path->sl = cm_lap_get_sl(lap_msg);
2682 path->mtu_selector = IB_SA_EQ;
2683 path->mtu = cm_id_priv->path_mtu;
2684 path->rate_selector = IB_SA_EQ;
2685 path->rate = cm_lap_get_packet_rate(lap_msg);
2686 path->packet_life_time_selector = IB_SA_EQ;
2687 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2688 path->packet_life_time -= (path->packet_life_time > 0);
2689 }
2690
2691 static int cm_lap_handler(struct cm_work *work)
2692 {
2693 struct cm_id_private *cm_id_priv;
2694 struct cm_lap_msg *lap_msg;
2695 struct ib_cm_lap_event_param *param;
2696 struct ib_mad_send_buf *msg = NULL;
2697 int ret;
2698
2699 /* todo: verify LAP request and send reject APR if invalid. */
2700 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2701 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2702 lap_msg->local_comm_id);
2703 if (!cm_id_priv)
2704 return -EINVAL;
2705
2706 param = &work->cm_event.param.lap_rcvd;
2707 param->alternate_path = &work->path[0];
2708 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
2709 work->cm_event.private_data = &lap_msg->private_data;
2710
2711 spin_lock_irq(&cm_id_priv->lock);
2712 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2713 goto unlock;
2714
2715 switch (cm_id_priv->id.lap_state) {
2716 case IB_CM_LAP_UNINIT:
2717 case IB_CM_LAP_IDLE:
2718 break;
2719 case IB_CM_MRA_LAP_SENT:
2720 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2721 counter[CM_LAP_COUNTER]);
2722 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2723 goto unlock;
2724
2725 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2726 CM_MSG_RESPONSE_OTHER,
2727 cm_id_priv->service_timeout,
2728 cm_id_priv->private_data,
2729 cm_id_priv->private_data_len);
2730 spin_unlock_irq(&cm_id_priv->lock);
2731
2732 if (ib_post_send_mad(msg, NULL))
2733 cm_free_msg(msg);
2734 goto deref;
2735 case IB_CM_LAP_RCVD:
2736 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2737 counter[CM_LAP_COUNTER]);
2738 goto unlock;
2739 default:
2740 goto unlock;
2741 }
2742
2743 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2744 cm_id_priv->tid = lap_msg->hdr.tid;
2745 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2746 work->mad_recv_wc->recv_buf.grh,
2747 &cm_id_priv->av);
2748 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
2749 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2750 if (!ret)
2751 list_add_tail(&work->list, &cm_id_priv->work_list);
2752 spin_unlock_irq(&cm_id_priv->lock);
2753
2754 if (ret)
2755 cm_process_work(cm_id_priv, work);
2756 else
2757 cm_deref_id(cm_id_priv);
2758 return 0;
2759
2760 unlock: spin_unlock_irq(&cm_id_priv->lock);
2761 deref: cm_deref_id(cm_id_priv);
2762 return -EINVAL;
2763 }
2764
2765 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2766 struct cm_id_private *cm_id_priv,
2767 enum ib_cm_apr_status status,
2768 void *info,
2769 u8 info_length,
2770 const void *private_data,
2771 u8 private_data_len)
2772 {
2773 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2774 apr_msg->local_comm_id = cm_id_priv->id.local_id;
2775 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2776 apr_msg->ap_status = (u8) status;
2777
2778 if (info && info_length) {
2779 apr_msg->info_length = info_length;
2780 memcpy(apr_msg->info, info, info_length);
2781 }
2782
2783 if (private_data && private_data_len)
2784 memcpy(apr_msg->private_data, private_data, private_data_len);
2785 }
2786
2787 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2788 enum ib_cm_apr_status status,
2789 void *info,
2790 u8 info_length,
2791 const void *private_data,
2792 u8 private_data_len)
2793 {
2794 struct cm_id_private *cm_id_priv;
2795 struct ib_mad_send_buf *msg;
2796 unsigned long flags;
2797 int ret;
2798
2799 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2800 (info && info_length > IB_CM_APR_INFO_LENGTH))
2801 return -EINVAL;
2802
2803 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2804 spin_lock_irqsave(&cm_id_priv->lock, flags);
2805 if (cm_id->state != IB_CM_ESTABLISHED ||
2806 (cm_id->lap_state != IB_CM_LAP_RCVD &&
2807 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2808 ret = -EINVAL;
2809 goto out;
2810 }
2811
2812 ret = cm_alloc_msg(cm_id_priv, &msg);
2813 if (ret)
2814 goto out;
2815
2816 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2817 info, info_length, private_data, private_data_len);
2818 ret = ib_post_send_mad(msg, NULL);
2819 if (ret) {
2820 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2821 cm_free_msg(msg);
2822 return ret;
2823 }
2824
2825 cm_id->lap_state = IB_CM_LAP_IDLE;
2826 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2827 return ret;
2828 }
2829 EXPORT_SYMBOL(ib_send_cm_apr);
2830
2831 static int cm_apr_handler(struct cm_work *work)
2832 {
2833 struct cm_id_private *cm_id_priv;
2834 struct cm_apr_msg *apr_msg;
2835 int ret;
2836
2837 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2838 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2839 apr_msg->local_comm_id);
2840 if (!cm_id_priv)
2841 return -EINVAL; /* Unmatched reply. */
2842
2843 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2844 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2845 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2846 work->cm_event.private_data = &apr_msg->private_data;
2847
2848 spin_lock_irq(&cm_id_priv->lock);
2849 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2850 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2851 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2852 spin_unlock_irq(&cm_id_priv->lock);
2853 goto out;
2854 }
2855 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2856 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2857 cm_id_priv->msg = NULL;
2858
2859 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2860 if (!ret)
2861 list_add_tail(&work->list, &cm_id_priv->work_list);
2862 spin_unlock_irq(&cm_id_priv->lock);
2863
2864 if (ret)
2865 cm_process_work(cm_id_priv, work);
2866 else
2867 cm_deref_id(cm_id_priv);
2868 return 0;
2869 out:
2870 cm_deref_id(cm_id_priv);
2871 return -EINVAL;
2872 }
2873
2874 static int cm_timewait_handler(struct cm_work *work)
2875 {
2876 struct cm_timewait_info *timewait_info;
2877 struct cm_id_private *cm_id_priv;
2878 int ret;
2879
2880 timewait_info = (struct cm_timewait_info *)work;
2881 spin_lock_irq(&cm.lock);
2882 list_del(&timewait_info->list);
2883 spin_unlock_irq(&cm.lock);
2884
2885 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2886 timewait_info->work.remote_id);
2887 if (!cm_id_priv)
2888 return -EINVAL;
2889
2890 spin_lock_irq(&cm_id_priv->lock);
2891 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2892 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2893 spin_unlock_irq(&cm_id_priv->lock);
2894 goto out;
2895 }
2896 cm_id_priv->id.state = IB_CM_IDLE;
2897 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2898 if (!ret)
2899 list_add_tail(&work->list, &cm_id_priv->work_list);
2900 spin_unlock_irq(&cm_id_priv->lock);
2901
2902 if (ret)
2903 cm_process_work(cm_id_priv, work);
2904 else
2905 cm_deref_id(cm_id_priv);
2906 return 0;
2907 out:
2908 cm_deref_id(cm_id_priv);
2909 return -EINVAL;
2910 }
2911
2912 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2913 struct cm_id_private *cm_id_priv,
2914 struct ib_cm_sidr_req_param *param)
2915 {
2916 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2917 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2918 sidr_req_msg->request_id = cm_id_priv->id.local_id;
2919 sidr_req_msg->pkey = param->path->pkey;
2920 sidr_req_msg->service_id = param->service_id;
2921
2922 if (param->private_data && param->private_data_len)
2923 memcpy(sidr_req_msg->private_data, param->private_data,
2924 param->private_data_len);
2925 }
2926
2927 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2928 struct ib_cm_sidr_req_param *param)
2929 {
2930 struct cm_id_private *cm_id_priv;
2931 struct ib_mad_send_buf *msg;
2932 unsigned long flags;
2933 int ret;
2934
2935 if (!param->path || (param->private_data &&
2936 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2937 return -EINVAL;
2938
2939 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2940 ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2941 if (ret)
2942 goto out;
2943
2944 cm_id->service_id = param->service_id;
2945 cm_id->service_mask = ~cpu_to_be64(0);
2946 cm_id_priv->timeout_ms = param->timeout_ms;
2947 cm_id_priv->max_cm_retries = param->max_cm_retries;
2948 ret = cm_alloc_msg(cm_id_priv, &msg);
2949 if (ret)
2950 goto out;
2951
2952 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2953 param);
2954 msg->timeout_ms = cm_id_priv->timeout_ms;
2955 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2956
2957 spin_lock_irqsave(&cm_id_priv->lock, flags);
2958 if (cm_id->state == IB_CM_IDLE)
2959 ret = ib_post_send_mad(msg, NULL);
2960 else
2961 ret = -EINVAL;
2962
2963 if (ret) {
2964 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2965 cm_free_msg(msg);
2966 goto out;
2967 }
2968 cm_id->state = IB_CM_SIDR_REQ_SENT;
2969 cm_id_priv->msg = msg;
2970 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2971 out:
2972 return ret;
2973 }
2974 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2975
2976 static void cm_format_sidr_req_event(struct cm_work *work,
2977 struct ib_cm_id *listen_id)
2978 {
2979 struct cm_sidr_req_msg *sidr_req_msg;
2980 struct ib_cm_sidr_req_event_param *param;
2981
2982 sidr_req_msg = (struct cm_sidr_req_msg *)
2983 work->mad_recv_wc->recv_buf.mad;
2984 param = &work->cm_event.param.sidr_req_rcvd;
2985 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2986 param->listen_id = listen_id;
2987 param->port = work->port->port_num;
2988 work->cm_event.private_data = &sidr_req_msg->private_data;
2989 }
2990
2991 static int cm_sidr_req_handler(struct cm_work *work)
2992 {
2993 struct ib_cm_id *cm_id;
2994 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2995 struct cm_sidr_req_msg *sidr_req_msg;
2996 struct ib_wc *wc;
2997
2998 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
2999 if (IS_ERR(cm_id))
3000 return PTR_ERR(cm_id);
3001 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3002
3003 /* Record SGID/SLID and request ID for lookup. */
3004 sidr_req_msg = (struct cm_sidr_req_msg *)
3005 work->mad_recv_wc->recv_buf.mad;
3006 wc = work->mad_recv_wc->wc;
3007 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
3008 cm_id_priv->av.dgid.global.interface_id = 0;
3009 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
3010 work->mad_recv_wc->recv_buf.grh,
3011 &cm_id_priv->av);
3012 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
3013 cm_id_priv->tid = sidr_req_msg->hdr.tid;
3014 atomic_inc(&cm_id_priv->work_count);
3015
3016 spin_lock_irq(&cm.lock);
3017 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3018 if (cur_cm_id_priv) {
3019 spin_unlock_irq(&cm.lock);
3020 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3021 counter[CM_SIDR_REQ_COUNTER]);
3022 goto out; /* Duplicate message. */
3023 }
3024 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3025 cur_cm_id_priv = cm_find_listen(cm_id->device,
3026 sidr_req_msg->service_id,
3027 sidr_req_msg->private_data);
3028 if (!cur_cm_id_priv) {
3029 spin_unlock_irq(&cm.lock);
3030 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED);
3031 goto out; /* No match. */
3032 }
3033 atomic_inc(&cur_cm_id_priv->refcount);
3034 atomic_inc(&cm_id_priv->refcount);
3035 spin_unlock_irq(&cm.lock);
3036
3037 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
3038 cm_id_priv->id.context = cur_cm_id_priv->id.context;
3039 cm_id_priv->id.service_id = sidr_req_msg->service_id;
3040 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3041
3042 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
3043 cm_process_work(cm_id_priv, work);
3044 cm_deref_id(cur_cm_id_priv);
3045 return 0;
3046 out:
3047 ib_destroy_cm_id(&cm_id_priv->id);
3048 return -EINVAL;
3049 }
3050
3051 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3052 struct cm_id_private *cm_id_priv,
3053 struct ib_cm_sidr_rep_param *param)
3054 {
3055 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3056 cm_id_priv->tid);
3057 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
3058 sidr_rep_msg->status = param->status;
3059 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
3060 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
3061 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
3062
3063 if (param->info && param->info_length)
3064 memcpy(sidr_rep_msg->info, param->info, param->info_length);
3065
3066 if (param->private_data && param->private_data_len)
3067 memcpy(sidr_rep_msg->private_data, param->private_data,
3068 param->private_data_len);
3069 }
3070
3071 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3072 struct ib_cm_sidr_rep_param *param)
3073 {
3074 struct cm_id_private *cm_id_priv;
3075 struct ib_mad_send_buf *msg;
3076 unsigned long flags;
3077 int ret;
3078
3079 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3080 (param->private_data &&
3081 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3082 return -EINVAL;
3083
3084 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3085 spin_lock_irqsave(&cm_id_priv->lock, flags);
3086 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
3087 ret = -EINVAL;
3088 goto error;
3089 }
3090
3091 ret = cm_alloc_msg(cm_id_priv, &msg);
3092 if (ret)
3093 goto error;
3094
3095 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3096 param);
3097 ret = ib_post_send_mad(msg, NULL);
3098 if (ret) {
3099 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3100 cm_free_msg(msg);
3101 return ret;
3102 }
3103 cm_id->state = IB_CM_IDLE;
3104 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3105
3106 spin_lock_irqsave(&cm.lock, flags);
3107 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) {
3108 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3109 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
3110 }
3111 spin_unlock_irqrestore(&cm.lock, flags);
3112 return 0;
3113
3114 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3115 return ret;
3116 }
3117 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3118
3119 static void cm_format_sidr_rep_event(struct cm_work *work)
3120 {
3121 struct cm_sidr_rep_msg *sidr_rep_msg;
3122 struct ib_cm_sidr_rep_event_param *param;
3123
3124 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3125 work->mad_recv_wc->recv_buf.mad;
3126 param = &work->cm_event.param.sidr_rep_rcvd;
3127 param->status = sidr_rep_msg->status;
3128 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
3129 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
3130 param->info = &sidr_rep_msg->info;
3131 param->info_len = sidr_rep_msg->info_length;
3132 work->cm_event.private_data = &sidr_rep_msg->private_data;
3133 }
3134
3135 static int cm_sidr_rep_handler(struct cm_work *work)
3136 {
3137 struct cm_sidr_rep_msg *sidr_rep_msg;
3138 struct cm_id_private *cm_id_priv;
3139
3140 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3141 work->mad_recv_wc->recv_buf.mad;
3142 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
3143 if (!cm_id_priv)
3144 return -EINVAL; /* Unmatched reply. */
3145
3146 spin_lock_irq(&cm_id_priv->lock);
3147 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3148 spin_unlock_irq(&cm_id_priv->lock);
3149 goto out;
3150 }
3151 cm_id_priv->id.state = IB_CM_IDLE;
3152 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3153 spin_unlock_irq(&cm_id_priv->lock);
3154
3155 cm_format_sidr_rep_event(work);
3156 cm_process_work(cm_id_priv, work);
3157 return 0;
3158 out:
3159 cm_deref_id(cm_id_priv);
3160 return -EINVAL;
3161 }
3162
3163 static void cm_process_send_error(struct ib_mad_send_buf *msg,
3164 enum ib_wc_status wc_status)
3165 {
3166 struct cm_id_private *cm_id_priv;
3167 struct ib_cm_event cm_event;
3168 enum ib_cm_state state;
3169 int ret;
3170
3171 memset(&cm_event, 0, sizeof cm_event);
3172 cm_id_priv = msg->context[0];
3173
3174 /* Discard old sends or ones without a response. */
3175 spin_lock_irq(&cm_id_priv->lock);
3176 state = (enum ib_cm_state) (unsigned long) msg->context[1];
3177 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3178 goto discard;
3179
3180 switch (state) {
3181 case IB_CM_REQ_SENT:
3182 case IB_CM_MRA_REQ_RCVD:
3183 cm_reset_to_idle(cm_id_priv);
3184 cm_event.event = IB_CM_REQ_ERROR;
3185 break;
3186 case IB_CM_REP_SENT:
3187 case IB_CM_MRA_REP_RCVD:
3188 cm_reset_to_idle(cm_id_priv);
3189 cm_event.event = IB_CM_REP_ERROR;
3190 break;
3191 case IB_CM_DREQ_SENT:
3192 cm_enter_timewait(cm_id_priv);
3193 cm_event.event = IB_CM_DREQ_ERROR;
3194 break;
3195 case IB_CM_SIDR_REQ_SENT:
3196 cm_id_priv->id.state = IB_CM_IDLE;
3197 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3198 break;
3199 default:
3200 goto discard;
3201 }
3202 spin_unlock_irq(&cm_id_priv->lock);
3203 cm_event.param.send_status = wc_status;
3204
3205 /* No other events can occur on the cm_id at this point. */
3206 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3207 cm_free_msg(msg);
3208 if (ret)
3209 ib_destroy_cm_id(&cm_id_priv->id);
3210 return;
3211 discard:
3212 spin_unlock_irq(&cm_id_priv->lock);
3213 cm_free_msg(msg);
3214 }
3215
3216 static void cm_send_handler(struct ib_mad_agent *mad_agent,
3217 struct ib_mad_send_wc *mad_send_wc)
3218 {
3219 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3220 struct cm_port *port;
3221 u16 attr_index;
3222
3223 port = mad_agent->context;
3224 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3225 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3226
3227 /*
3228 * If the send was in response to a received message (context[0] is not
3229 * set to a cm_id), and is not a REJ, then it is a send that was
3230 * manually retried.
3231 */
3232 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3233 msg->retries = 1;
3234
3235 atomic_long_add(1 + msg->retries,
3236 &port->counter_group[CM_XMIT].counter[attr_index]);
3237 if (msg->retries)
3238 atomic_long_add(msg->retries,
3239 &port->counter_group[CM_XMIT_RETRIES].
3240 counter[attr_index]);
3241
3242 switch (mad_send_wc->status) {
3243 case IB_WC_SUCCESS:
3244 case IB_WC_WR_FLUSH_ERR:
3245 cm_free_msg(msg);
3246 break;
3247 default:
3248 if (msg->context[0] && msg->context[1])
3249 cm_process_send_error(msg, mad_send_wc->status);
3250 else
3251 cm_free_msg(msg);
3252 break;
3253 }
3254 }
3255
3256 static void cm_work_handler(struct work_struct *_work)
3257 {
3258 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3259 int ret;
3260
3261 switch (work->cm_event.event) {
3262 case IB_CM_REQ_RECEIVED:
3263 ret = cm_req_handler(work);
3264 break;
3265 case IB_CM_MRA_RECEIVED:
3266 ret = cm_mra_handler(work);
3267 break;
3268 case IB_CM_REJ_RECEIVED:
3269 ret = cm_rej_handler(work);
3270 break;
3271 case IB_CM_REP_RECEIVED:
3272 ret = cm_rep_handler(work);
3273 break;
3274 case IB_CM_RTU_RECEIVED:
3275 ret = cm_rtu_handler(work);
3276 break;
3277 case IB_CM_USER_ESTABLISHED:
3278 ret = cm_establish_handler(work);
3279 break;
3280 case IB_CM_DREQ_RECEIVED:
3281 ret = cm_dreq_handler(work);
3282 break;
3283 case IB_CM_DREP_RECEIVED:
3284 ret = cm_drep_handler(work);
3285 break;
3286 case IB_CM_SIDR_REQ_RECEIVED:
3287 ret = cm_sidr_req_handler(work);
3288 break;
3289 case IB_CM_SIDR_REP_RECEIVED:
3290 ret = cm_sidr_rep_handler(work);
3291 break;
3292 case IB_CM_LAP_RECEIVED:
3293 ret = cm_lap_handler(work);
3294 break;
3295 case IB_CM_APR_RECEIVED:
3296 ret = cm_apr_handler(work);
3297 break;
3298 case IB_CM_TIMEWAIT_EXIT:
3299 ret = cm_timewait_handler(work);
3300 break;
3301 default:
3302 ret = -EINVAL;
3303 break;
3304 }
3305 if (ret)
3306 cm_free_work(work);
3307 }
3308
3309 static int cm_establish(struct ib_cm_id *cm_id)
3310 {
3311 struct cm_id_private *cm_id_priv;
3312 struct cm_work *work;
3313 unsigned long flags;
3314 int ret = 0;
3315
3316 work = kmalloc(sizeof *work, GFP_ATOMIC);
3317 if (!work)
3318 return -ENOMEM;
3319
3320 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3321 spin_lock_irqsave(&cm_id_priv->lock, flags);
3322 switch (cm_id->state)
3323 {
3324 case IB_CM_REP_SENT:
3325 case IB_CM_MRA_REP_RCVD:
3326 cm_id->state = IB_CM_ESTABLISHED;
3327 break;
3328 case IB_CM_ESTABLISHED:
3329 ret = -EISCONN;
3330 break;
3331 default:
3332 ret = -EINVAL;
3333 break;
3334 }
3335 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3336
3337 if (ret) {
3338 kfree(work);
3339 goto out;
3340 }
3341
3342 /*
3343 * The CM worker thread may try to destroy the cm_id before it
3344 * can execute this work item. To prevent potential deadlock,
3345 * we need to find the cm_id once we're in the context of the
3346 * worker thread, rather than holding a reference on it.
3347 */
3348 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3349 work->local_id = cm_id->local_id;
3350 work->remote_id = cm_id->remote_id;
3351 work->mad_recv_wc = NULL;
3352 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3353 queue_delayed_work(cm.wq, &work->work, 0);
3354 out:
3355 return ret;
3356 }
3357
3358 static int cm_migrate(struct ib_cm_id *cm_id)
3359 {
3360 struct cm_id_private *cm_id_priv;
3361 unsigned long flags;
3362 int ret = 0;
3363
3364 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3365 spin_lock_irqsave(&cm_id_priv->lock, flags);
3366 if (cm_id->state == IB_CM_ESTABLISHED &&
3367 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3368 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3369 cm_id->lap_state = IB_CM_LAP_IDLE;
3370 cm_id_priv->av = cm_id_priv->alt_av;
3371 } else
3372 ret = -EINVAL;
3373 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3374
3375 return ret;
3376 }
3377
3378 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3379 {
3380 int ret;
3381
3382 switch (event) {
3383 case IB_EVENT_COMM_EST:
3384 ret = cm_establish(cm_id);
3385 break;
3386 case IB_EVENT_PATH_MIG:
3387 ret = cm_migrate(cm_id);
3388 break;
3389 default:
3390 ret = -EINVAL;
3391 }
3392 return ret;
3393 }
3394 EXPORT_SYMBOL(ib_cm_notify);
3395
3396 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3397 struct ib_mad_recv_wc *mad_recv_wc)
3398 {
3399 struct cm_port *port = mad_agent->context;
3400 struct cm_work *work;
3401 enum ib_cm_event_type event;
3402 u16 attr_id;
3403 int paths = 0;
3404
3405 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3406 case CM_REQ_ATTR_ID:
3407 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3408 alt_local_lid != 0);
3409 event = IB_CM_REQ_RECEIVED;
3410 break;
3411 case CM_MRA_ATTR_ID:
3412 event = IB_CM_MRA_RECEIVED;
3413 break;
3414 case CM_REJ_ATTR_ID:
3415 event = IB_CM_REJ_RECEIVED;
3416 break;
3417 case CM_REP_ATTR_ID:
3418 event = IB_CM_REP_RECEIVED;
3419 break;
3420 case CM_RTU_ATTR_ID:
3421 event = IB_CM_RTU_RECEIVED;
3422 break;
3423 case CM_DREQ_ATTR_ID:
3424 event = IB_CM_DREQ_RECEIVED;
3425 break;
3426 case CM_DREP_ATTR_ID:
3427 event = IB_CM_DREP_RECEIVED;
3428 break;
3429 case CM_SIDR_REQ_ATTR_ID:
3430 event = IB_CM_SIDR_REQ_RECEIVED;
3431 break;
3432 case CM_SIDR_REP_ATTR_ID:
3433 event = IB_CM_SIDR_REP_RECEIVED;
3434 break;
3435 case CM_LAP_ATTR_ID:
3436 paths = 1;
3437 event = IB_CM_LAP_RECEIVED;
3438 break;
3439 case CM_APR_ATTR_ID:
3440 event = IB_CM_APR_RECEIVED;
3441 break;
3442 default:
3443 ib_free_recv_mad(mad_recv_wc);
3444 return;
3445 }
3446
3447 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
3448 atomic_long_inc(&port->counter_group[CM_RECV].
3449 counter[attr_id - CM_ATTR_ID_OFFSET]);
3450
3451 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3452 GFP_KERNEL);
3453 if (!work) {
3454 ib_free_recv_mad(mad_recv_wc);
3455 return;
3456 }
3457
3458 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3459 work->cm_event.event = event;
3460 work->mad_recv_wc = mad_recv_wc;
3461 work->port = port;
3462 queue_delayed_work(cm.wq, &work->work, 0);
3463 }
3464
3465 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3466 struct ib_qp_attr *qp_attr,
3467 int *qp_attr_mask)
3468 {
3469 unsigned long flags;
3470 int ret;
3471
3472 spin_lock_irqsave(&cm_id_priv->lock, flags);
3473 switch (cm_id_priv->id.state) {
3474 case IB_CM_REQ_SENT:
3475 case IB_CM_MRA_REQ_RCVD:
3476 case IB_CM_REQ_RCVD:
3477 case IB_CM_MRA_REQ_SENT:
3478 case IB_CM_REP_RCVD:
3479 case IB_CM_MRA_REP_SENT:
3480 case IB_CM_REP_SENT:
3481 case IB_CM_MRA_REP_RCVD:
3482 case IB_CM_ESTABLISHED:
3483 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3484 IB_QP_PKEY_INDEX | IB_QP_PORT;
3485 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
3486 if (cm_id_priv->responder_resources)
3487 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3488 IB_ACCESS_REMOTE_ATOMIC;
3489 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3490 qp_attr->port_num = cm_id_priv->av.port->port_num;
3491 ret = 0;
3492 break;
3493 default:
3494 ret = -EINVAL;
3495 break;
3496 }
3497 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3498 return ret;
3499 }
3500
3501 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3502 struct ib_qp_attr *qp_attr,
3503 int *qp_attr_mask)
3504 {
3505 unsigned long flags;
3506 int ret;
3507
3508 spin_lock_irqsave(&cm_id_priv->lock, flags);
3509 switch (cm_id_priv->id.state) {
3510 case IB_CM_REQ_RCVD:
3511 case IB_CM_MRA_REQ_SENT:
3512 case IB_CM_REP_RCVD:
3513 case IB_CM_MRA_REP_SENT:
3514 case IB_CM_REP_SENT:
3515 case IB_CM_MRA_REP_RCVD:
3516 case IB_CM_ESTABLISHED:
3517 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3518 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3519 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3520 if (!cm_id_priv->av.valid) {
3521 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3522 return -EINVAL;
3523 }
3524 if (cm_id_priv->av.ah_attr.vlan_id != 0xffff) {
3525 qp_attr->vlan_id = cm_id_priv->av.ah_attr.vlan_id;
3526 *qp_attr_mask |= IB_QP_VID;
3527 }
3528 if (!is_zero_ether_addr(cm_id_priv->av.smac)) {
3529 memcpy(qp_attr->smac, cm_id_priv->av.smac,
3530 sizeof(qp_attr->smac));
3531 *qp_attr_mask |= IB_QP_SMAC;
3532 }
3533 if (cm_id_priv->alt_av.valid) {
3534 if (cm_id_priv->alt_av.ah_attr.vlan_id != 0xffff) {
3535 qp_attr->alt_vlan_id =
3536 cm_id_priv->alt_av.ah_attr.vlan_id;
3537 *qp_attr_mask |= IB_QP_ALT_VID;
3538 }
3539 if (!is_zero_ether_addr(cm_id_priv->alt_av.smac)) {
3540 memcpy(qp_attr->alt_smac,
3541 cm_id_priv->alt_av.smac,
3542 sizeof(qp_attr->alt_smac));
3543 *qp_attr_mask |= IB_QP_ALT_SMAC;
3544 }
3545 }
3546 qp_attr->path_mtu = cm_id_priv->path_mtu;
3547 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3548 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3549 if (cm_id_priv->qp_type == IB_QPT_RC ||
3550 cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
3551 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3552 IB_QP_MIN_RNR_TIMER;
3553 qp_attr->max_dest_rd_atomic =
3554 cm_id_priv->responder_resources;
3555 qp_attr->min_rnr_timer = 0;
3556 }
3557 if (cm_id_priv->alt_av.ah_attr.dlid) {
3558 *qp_attr_mask |= IB_QP_ALT_PATH;
3559 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3560 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3561 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3562 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3563 }
3564 ret = 0;
3565 break;
3566 default:
3567 ret = -EINVAL;
3568 break;
3569 }
3570 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3571 return ret;
3572 }
3573
3574 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3575 struct ib_qp_attr *qp_attr,
3576 int *qp_attr_mask)
3577 {
3578 unsigned long flags;
3579 int ret;
3580
3581 spin_lock_irqsave(&cm_id_priv->lock, flags);
3582 switch (cm_id_priv->id.state) {
3583 /* Allow transition to RTS before sending REP */
3584 case IB_CM_REQ_RCVD:
3585 case IB_CM_MRA_REQ_SENT:
3586
3587 case IB_CM_REP_RCVD:
3588 case IB_CM_MRA_REP_SENT:
3589 case IB_CM_REP_SENT:
3590 case IB_CM_MRA_REP_RCVD:
3591 case IB_CM_ESTABLISHED:
3592 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
3593 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3594 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3595 switch (cm_id_priv->qp_type) {
3596 case IB_QPT_RC:
3597 case IB_QPT_XRC_INI:
3598 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
3599 IB_QP_MAX_QP_RD_ATOMIC;
3600 qp_attr->retry_cnt = cm_id_priv->retry_count;
3601 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3602 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3603 /* fall through */
3604 case IB_QPT_XRC_TGT:
3605 *qp_attr_mask |= IB_QP_TIMEOUT;
3606 qp_attr->timeout = cm_id_priv->av.timeout;
3607 break;
3608 default:
3609 break;
3610 }
3611 if (cm_id_priv->alt_av.ah_attr.dlid) {
3612 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3613 qp_attr->path_mig_state = IB_MIG_REARM;
3614 }
3615 } else {
3616 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
3617 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3618 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3619 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3620 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3621 qp_attr->path_mig_state = IB_MIG_REARM;
3622 }
3623 ret = 0;
3624 break;
3625 default:
3626 ret = -EINVAL;
3627 break;
3628 }
3629 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3630 return ret;
3631 }
3632
3633 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3634 struct ib_qp_attr *qp_attr,
3635 int *qp_attr_mask)
3636 {
3637 struct cm_id_private *cm_id_priv;
3638 int ret;
3639
3640 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3641 switch (qp_attr->qp_state) {
3642 case IB_QPS_INIT:
3643 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3644 break;
3645 case IB_QPS_RTR:
3646 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3647 break;
3648 case IB_QPS_RTS:
3649 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3650 break;
3651 default:
3652 ret = -EINVAL;
3653 break;
3654 }
3655 return ret;
3656 }
3657 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3658
3659 static void cm_get_ack_delay(struct cm_device *cm_dev)
3660 {
3661 struct ib_device_attr attr;
3662
3663 if (ib_query_device(cm_dev->ib_device, &attr))
3664 cm_dev->ack_delay = 0; /* acks will rely on packet life time */
3665 else
3666 cm_dev->ack_delay = attr.local_ca_ack_delay;
3667 }
3668
3669 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
3670 char *buf)
3671 {
3672 struct cm_counter_group *group;
3673 struct cm_counter_attribute *cm_attr;
3674
3675 group = container_of(obj, struct cm_counter_group, obj);
3676 cm_attr = container_of(attr, struct cm_counter_attribute, attr);
3677
3678 return sprintf(buf, "%ld\n",
3679 atomic_long_read(&group->counter[cm_attr->index]));
3680 }
3681
3682 static const struct sysfs_ops cm_counter_ops = {
3683 .show = cm_show_counter
3684 };
3685
3686 static struct kobj_type cm_counter_obj_type = {
3687 .sysfs_ops = &cm_counter_ops,
3688 .default_attrs = cm_counter_default_attrs
3689 };
3690
3691 static void cm_release_port_obj(struct kobject *obj)
3692 {
3693 struct cm_port *cm_port;
3694
3695 cm_port = container_of(obj, struct cm_port, port_obj);
3696 kfree(cm_port);
3697 }
3698
3699 static struct kobj_type cm_port_obj_type = {
3700 .release = cm_release_port_obj
3701 };
3702
3703 static char *cm_devnode(struct device *dev, umode_t *mode)
3704 {
3705 if (mode)
3706 *mode = 0666;
3707 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
3708 }
3709
3710 struct class cm_class = {
3711 .owner = THIS_MODULE,
3712 .name = "infiniband_cm",
3713 .devnode = cm_devnode,
3714 };
3715 EXPORT_SYMBOL(cm_class);
3716
3717 static int cm_create_port_fs(struct cm_port *port)
3718 {
3719 int i, ret;
3720
3721 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type,
3722 &port->cm_dev->device->kobj,
3723 "%d", port->port_num);
3724 if (ret) {
3725 kfree(port);
3726 return ret;
3727 }
3728
3729 for (i = 0; i < CM_COUNTER_GROUPS; i++) {
3730 ret = kobject_init_and_add(&port->counter_group[i].obj,
3731 &cm_counter_obj_type,
3732 &port->port_obj,
3733 "%s", counter_group_names[i]);
3734 if (ret)
3735 goto error;
3736 }
3737
3738 return 0;
3739
3740 error:
3741 while (i--)
3742 kobject_put(&port->counter_group[i].obj);
3743 kobject_put(&port->port_obj);
3744 return ret;
3745
3746 }
3747
3748 static void cm_remove_port_fs(struct cm_port *port)
3749 {
3750 int i;
3751
3752 for (i = 0; i < CM_COUNTER_GROUPS; i++)
3753 kobject_put(&port->counter_group[i].obj);
3754
3755 kobject_put(&port->port_obj);
3756 }
3757
3758 static void cm_add_one(struct ib_device *ib_device)
3759 {
3760 struct cm_device *cm_dev;
3761 struct cm_port *port;
3762 struct ib_mad_reg_req reg_req = {
3763 .mgmt_class = IB_MGMT_CLASS_CM,
3764 .mgmt_class_version = IB_CM_CLASS_VERSION,
3765 };
3766 struct ib_port_modify port_modify = {
3767 .set_port_cap_mask = IB_PORT_CM_SUP
3768 };
3769 unsigned long flags;
3770 int ret;
3771 u8 i;
3772
3773 if (rdma_node_get_transport(ib_device->node_type) != RDMA_TRANSPORT_IB)
3774 return;
3775
3776 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) *
3777 ib_device->phys_port_cnt, GFP_KERNEL);
3778 if (!cm_dev)
3779 return;
3780
3781 cm_dev->ib_device = ib_device;
3782 cm_get_ack_delay(cm_dev);
3783
3784 cm_dev->device = device_create(&cm_class, &ib_device->dev,
3785 MKDEV(0, 0), NULL,
3786 "%s", ib_device->name);
3787 if (IS_ERR(cm_dev->device)) {
3788 kfree(cm_dev);
3789 return;
3790 }
3791
3792 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3793 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3794 port = kzalloc(sizeof *port, GFP_KERNEL);
3795 if (!port)
3796 goto error1;
3797
3798 cm_dev->port[i-1] = port;
3799 port->cm_dev = cm_dev;
3800 port->port_num = i;
3801
3802 ret = cm_create_port_fs(port);
3803 if (ret)
3804 goto error1;
3805
3806 port->mad_agent = ib_register_mad_agent(ib_device, i,
3807 IB_QPT_GSI,
3808 &reg_req,
3809 0,
3810 cm_send_handler,
3811 cm_recv_handler,
3812 port,
3813 0);
3814 if (IS_ERR(port->mad_agent))
3815 goto error2;
3816
3817 ret = ib_modify_port(ib_device, i, 0, &port_modify);
3818 if (ret)
3819 goto error3;
3820 }
3821 ib_set_client_data(ib_device, &cm_client, cm_dev);
3822
3823 write_lock_irqsave(&cm.device_lock, flags);
3824 list_add_tail(&cm_dev->list, &cm.device_list);
3825 write_unlock_irqrestore(&cm.device_lock, flags);
3826 return;
3827
3828 error3:
3829 ib_unregister_mad_agent(port->mad_agent);
3830 error2:
3831 cm_remove_port_fs(port);
3832 error1:
3833 port_modify.set_port_cap_mask = 0;
3834 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3835 while (--i) {
3836 port = cm_dev->port[i-1];
3837 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3838 ib_unregister_mad_agent(port->mad_agent);
3839 cm_remove_port_fs(port);
3840 }
3841 device_unregister(cm_dev->device);
3842 kfree(cm_dev);
3843 }
3844
3845 static void cm_remove_one(struct ib_device *ib_device)
3846 {
3847 struct cm_device *cm_dev;
3848 struct cm_port *port;
3849 struct ib_port_modify port_modify = {
3850 .clr_port_cap_mask = IB_PORT_CM_SUP
3851 };
3852 unsigned long flags;
3853 int i;
3854
3855 cm_dev = ib_get_client_data(ib_device, &cm_client);
3856 if (!cm_dev)
3857 return;
3858
3859 write_lock_irqsave(&cm.device_lock, flags);
3860 list_del(&cm_dev->list);
3861 write_unlock_irqrestore(&cm.device_lock, flags);
3862
3863 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3864 port = cm_dev->port[i-1];
3865 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3866 ib_unregister_mad_agent(port->mad_agent);
3867 flush_workqueue(cm.wq);
3868 cm_remove_port_fs(port);
3869 }
3870 device_unregister(cm_dev->device);
3871 kfree(cm_dev);
3872 }
3873
3874 static int __init ib_cm_init(void)
3875 {
3876 int ret;
3877
3878 memset(&cm, 0, sizeof cm);
3879 INIT_LIST_HEAD(&cm.device_list);
3880 rwlock_init(&cm.device_lock);
3881 spin_lock_init(&cm.lock);
3882 cm.listen_service_table = RB_ROOT;
3883 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3884 cm.remote_id_table = RB_ROOT;
3885 cm.remote_qp_table = RB_ROOT;
3886 cm.remote_sidr_table = RB_ROOT;
3887 idr_init(&cm.local_id_table);
3888 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3889 INIT_LIST_HEAD(&cm.timewait_list);
3890
3891 ret = class_register(&cm_class);
3892 if (ret) {
3893 ret = -ENOMEM;
3894 goto error1;
3895 }
3896
3897 cm.wq = create_workqueue("ib_cm");
3898 if (!cm.wq) {
3899 ret = -ENOMEM;
3900 goto error2;
3901 }
3902
3903 ret = ib_register_client(&cm_client);
3904 if (ret)
3905 goto error3;
3906
3907 return 0;
3908 error3:
3909 destroy_workqueue(cm.wq);
3910 error2:
3911 class_unregister(&cm_class);
3912 error1:
3913 idr_destroy(&cm.local_id_table);
3914 return ret;
3915 }
3916
3917 static void __exit ib_cm_cleanup(void)
3918 {
3919 struct cm_timewait_info *timewait_info, *tmp;
3920
3921 spin_lock_irq(&cm.lock);
3922 list_for_each_entry(timewait_info, &cm.timewait_list, list)
3923 cancel_delayed_work(&timewait_info->work.work);
3924 spin_unlock_irq(&cm.lock);
3925
3926 ib_unregister_client(&cm_client);
3927 destroy_workqueue(cm.wq);
3928
3929 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
3930 list_del(&timewait_info->list);
3931 kfree(timewait_info);
3932 }
3933
3934 class_unregister(&cm_class);
3935 idr_destroy(&cm.local_id_table);
3936 }
3937
3938 module_init(ib_cm_init);
3939 module_exit(ib_cm_cleanup);
3940
Linux with added FPC-III support