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x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / infiniband / core / cm.c
blob784b97cb05b00f3f8d08786d7ef0ff22aa8434b0
1 /*
2 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved.
3 * Copyright (c) 2004 Topspin Corporation. All rights reserved.
4 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved.
5 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 */
35
36 #include <linux/completion.h>
37 #include <linux/dma-mapping.h>
38 #include <linux/device.h>
39 #include <linux/module.h>
40 #include <linux/err.h>
41 #include <linux/idr.h>
42 #include <linux/interrupt.h>
43 #include <linux/random.h>
44 #include <linux/rbtree.h>
45 #include <linux/spinlock.h>
46 #include <linux/slab.h>
47 #include <linux/sysfs.h>
48 #include <linux/workqueue.h>
49 #include <linux/kdev_t.h>
50
51 #include <rdma/ib_cache.h>
52 #include <rdma/ib_cm.h>
53 #include "cm_msgs.h"
54
55 MODULE_AUTHOR("Sean Hefty");
56 MODULE_DESCRIPTION("InfiniBand CM");
57 MODULE_LICENSE("Dual BSD/GPL");
58
59 static void cm_add_one(struct ib_device *device);
60 static void cm_remove_one(struct ib_device *device);
61
62 static struct ib_client cm_client = {
63 .name = "cm",
64 .add = cm_add_one,
65 .remove = cm_remove_one
66 };
67
68 static struct ib_cm {
69 spinlock_t lock;
70 struct list_head device_list;
71 rwlock_t device_lock;
72 struct rb_root listen_service_table;
73 u64 listen_service_id;
74 /* struct rb_root peer_service_table; todo: fix peer to peer */
75 struct rb_root remote_qp_table;
76 struct rb_root remote_id_table;
77 struct rb_root remote_sidr_table;
78 struct idr local_id_table;
79 __be32 random_id_operand;
80 struct list_head timewait_list;
81 struct workqueue_struct *wq;
82 } cm;
83
84 /* Counter indexes ordered by attribute ID */
85 enum {
86 CM_REQ_COUNTER,
87 CM_MRA_COUNTER,
88 CM_REJ_COUNTER,
89 CM_REP_COUNTER,
90 CM_RTU_COUNTER,
91 CM_DREQ_COUNTER,
92 CM_DREP_COUNTER,
93 CM_SIDR_REQ_COUNTER,
94 CM_SIDR_REP_COUNTER,
95 CM_LAP_COUNTER,
96 CM_APR_COUNTER,
97 CM_ATTR_COUNT,
98 CM_ATTR_ID_OFFSET = 0x0010,
99 };
100
101 enum {
102 CM_XMIT,
103 CM_XMIT_RETRIES,
104 CM_RECV,
105 CM_RECV_DUPLICATES,
106 CM_COUNTER_GROUPS
107 };
108
109 static char const counter_group_names[CM_COUNTER_GROUPS]
110 [sizeof("cm_rx_duplicates")] = {
111 "cm_tx_msgs", "cm_tx_retries",
112 "cm_rx_msgs", "cm_rx_duplicates"
113 };
114
115 struct cm_counter_group {
116 struct kobject obj;
117 atomic_long_t counter[CM_ATTR_COUNT];
118 };
119
120 struct cm_counter_attribute {
121 struct attribute attr;
122 int index;
123 };
124
125 #define CM_COUNTER_ATTR(_name, _index) \
126 struct cm_counter_attribute cm_##_name##_counter_attr = { \
127 .attr = { .name = __stringify(_name), .mode = 0444 }, \
128 .index = _index \
129 }
130
131 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
132 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
133 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
134 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
135 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
136 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
137 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
138 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
139 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
140 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
141 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
142
143 static struct attribute *cm_counter_default_attrs[] = {
144 &cm_req_counter_attr.attr,
145 &cm_mra_counter_attr.attr,
146 &cm_rej_counter_attr.attr,
147 &cm_rep_counter_attr.attr,
148 &cm_rtu_counter_attr.attr,
149 &cm_dreq_counter_attr.attr,
150 &cm_drep_counter_attr.attr,
151 &cm_sidr_req_counter_attr.attr,
152 &cm_sidr_rep_counter_attr.attr,
153 &cm_lap_counter_attr.attr,
154 &cm_apr_counter_attr.attr,
155 NULL
156 };
157
158 struct cm_port {
159 struct cm_device *cm_dev;
160 struct ib_mad_agent *mad_agent;
161 struct kobject port_obj;
162 u8 port_num;
163 struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
164 };
165
166 struct cm_device {
167 struct list_head list;
168 struct ib_device *ib_device;
169 struct device *device;
170 u8 ack_delay;
171 struct cm_port *port[0];
172 };
173
174 struct cm_av {
175 struct cm_port *port;
176 union ib_gid dgid;
177 struct ib_ah_attr ah_attr;
178 u16 pkey_index;
179 u8 timeout;
180 };
181
182 struct cm_work {
183 struct delayed_work work;
184 struct list_head list;
185 struct cm_port *port;
186 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
187 __be32 local_id; /* Established / timewait */
188 __be32 remote_id;
189 struct ib_cm_event cm_event;
190 struct ib_sa_path_rec path[0];
191 };
192
193 struct cm_timewait_info {
194 struct cm_work work; /* Must be first. */
195 struct list_head list;
196 struct rb_node remote_qp_node;
197 struct rb_node remote_id_node;
198 __be64 remote_ca_guid;
199 __be32 remote_qpn;
200 u8 inserted_remote_qp;
201 u8 inserted_remote_id;
202 };
203
204 struct cm_id_private {
205 struct ib_cm_id id;
206
207 struct rb_node service_node;
208 struct rb_node sidr_id_node;
209 spinlock_t lock; /* Do not acquire inside cm.lock */
210 struct completion comp;
211 atomic_t refcount;
212
213 struct ib_mad_send_buf *msg;
214 struct cm_timewait_info *timewait_info;
215 /* todo: use alternate port on send failure */
216 struct cm_av av;
217 struct cm_av alt_av;
218 struct ib_cm_compare_data *compare_data;
219
220 void *private_data;
221 __be64 tid;
222 __be32 local_qpn;
223 __be32 remote_qpn;
224 enum ib_qp_type qp_type;
225 __be32 sq_psn;
226 __be32 rq_psn;
227 int timeout_ms;
228 enum ib_mtu path_mtu;
229 __be16 pkey;
230 u8 private_data_len;
231 u8 max_cm_retries;
232 u8 peer_to_peer;
233 u8 responder_resources;
234 u8 initiator_depth;
235 u8 retry_count;
236 u8 rnr_retry_count;
237 u8 service_timeout;
238 u8 target_ack_delay;
239
240 struct list_head work_list;
241 atomic_t work_count;
242 };
243
244 static void cm_work_handler(struct work_struct *work);
245
246 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
247 {
248 if (atomic_dec_and_test(&cm_id_priv->refcount))
249 complete(&cm_id_priv->comp);
250 }
251
252 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
253 struct ib_mad_send_buf **msg)
254 {
255 struct ib_mad_agent *mad_agent;
256 struct ib_mad_send_buf *m;
257 struct ib_ah *ah;
258
259 mad_agent = cm_id_priv->av.port->mad_agent;
260 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
261 if (IS_ERR(ah))
262 return PTR_ERR(ah);
263
264 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
265 cm_id_priv->av.pkey_index,
266 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
267 GFP_ATOMIC);
268 if (IS_ERR(m)) {
269 ib_destroy_ah(ah);
270 return PTR_ERR(m);
271 }
272
273 /* Timeout set by caller if response is expected. */
274 m->ah = ah;
275 m->retries = cm_id_priv->max_cm_retries;
276
277 atomic_inc(&cm_id_priv->refcount);
278 m->context[0] = cm_id_priv;
279 *msg = m;
280 return 0;
281 }
282
283 static int cm_alloc_response_msg(struct cm_port *port,
284 struct ib_mad_recv_wc *mad_recv_wc,
285 struct ib_mad_send_buf **msg)
286 {
287 struct ib_mad_send_buf *m;
288 struct ib_ah *ah;
289
290 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
291 mad_recv_wc->recv_buf.grh, port->port_num);
292 if (IS_ERR(ah))
293 return PTR_ERR(ah);
294
295 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
296 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
297 GFP_ATOMIC);
298 if (IS_ERR(m)) {
299 ib_destroy_ah(ah);
300 return PTR_ERR(m);
301 }
302 m->ah = ah;
303 *msg = m;
304 return 0;
305 }
306
307 static void cm_free_msg(struct ib_mad_send_buf *msg)
308 {
309 ib_destroy_ah(msg->ah);
310 if (msg->context[0])
311 cm_deref_id(msg->context[0]);
312 ib_free_send_mad(msg);
313 }
314
315 static void * cm_copy_private_data(const void *private_data,
316 u8 private_data_len)
317 {
318 void *data;
319
320 if (!private_data || !private_data_len)
321 return NULL;
322
323 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
324 if (!data)
325 return ERR_PTR(-ENOMEM);
326
327 return data;
328 }
329
330 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
331 void *private_data, u8 private_data_len)
332 {
333 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
334 kfree(cm_id_priv->private_data);
335
336 cm_id_priv->private_data = private_data;
337 cm_id_priv->private_data_len = private_data_len;
338 }
339
340 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
341 struct ib_grh *grh, struct cm_av *av)
342 {
343 av->port = port;
344 av->pkey_index = wc->pkey_index;
345 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc,
346 grh, &av->ah_attr);
347 }
348
349 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
350 {
351 struct cm_device *cm_dev;
352 struct cm_port *port = NULL;
353 unsigned long flags;
354 int ret;
355 u8 p;
356
357 read_lock_irqsave(&cm.device_lock, flags);
358 list_for_each_entry(cm_dev, &cm.device_list, list) {
359 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid,
360 &p, NULL)) {
361 port = cm_dev->port[p-1];
362 break;
363 }
364 }
365 read_unlock_irqrestore(&cm.device_lock, flags);
366
367 if (!port)
368 return -EINVAL;
369
370 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
371 be16_to_cpu(path->pkey), &av->pkey_index);
372 if (ret)
373 return ret;
374
375 av->port = port;
376 ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path,
377 &av->ah_attr);
378 av->timeout = path->packet_life_time + 1;
379 return 0;
380 }
381
382 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
383 {
384 unsigned long flags;
385 int id;
386 static int next_id;
387
388 idr_preload(GFP_KERNEL);
389 spin_lock_irqsave(&cm.lock, flags);
390
391 id = idr_alloc(&cm.local_id_table, cm_id_priv, next_id, 0, GFP_NOWAIT);
392 if (id >= 0)
393 next_id = max(id + 1, 0);
394
395 spin_unlock_irqrestore(&cm.lock, flags);
396 idr_preload_end();
397
398 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
399 return id < 0 ? id : 0;
400 }
401
402 static void cm_free_id(__be32 local_id)
403 {
404 spin_lock_irq(&cm.lock);
405 idr_remove(&cm.local_id_table,
406 (__force int) (local_id ^ cm.random_id_operand));
407 spin_unlock_irq(&cm.lock);
408 }
409
410 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
411 {
412 struct cm_id_private *cm_id_priv;
413
414 cm_id_priv = idr_find(&cm.local_id_table,
415 (__force int) (local_id ^ cm.random_id_operand));
416 if (cm_id_priv) {
417 if (cm_id_priv->id.remote_id == remote_id)
418 atomic_inc(&cm_id_priv->refcount);
419 else
420 cm_id_priv = NULL;
421 }
422
423 return cm_id_priv;
424 }
425
426 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
427 {
428 struct cm_id_private *cm_id_priv;
429
430 spin_lock_irq(&cm.lock);
431 cm_id_priv = cm_get_id(local_id, remote_id);
432 spin_unlock_irq(&cm.lock);
433
434 return cm_id_priv;
435 }
436
437 static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
438 {
439 int i;
440
441 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
442 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
443 ((unsigned long *) mask)[i];
444 }
445
446 static int cm_compare_data(struct ib_cm_compare_data *src_data,
447 struct ib_cm_compare_data *dst_data)
448 {
449 u8 src[IB_CM_COMPARE_SIZE];
450 u8 dst[IB_CM_COMPARE_SIZE];
451
452 if (!src_data || !dst_data)
453 return 0;
454
455 cm_mask_copy(src, src_data->data, dst_data->mask);
456 cm_mask_copy(dst, dst_data->data, src_data->mask);
457 return memcmp(src, dst, IB_CM_COMPARE_SIZE);
458 }
459
460 static int cm_compare_private_data(u8 *private_data,
461 struct ib_cm_compare_data *dst_data)
462 {
463 u8 src[IB_CM_COMPARE_SIZE];
464
465 if (!dst_data)
466 return 0;
467
468 cm_mask_copy(src, private_data, dst_data->mask);
469 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
470 }
471
472 /*
473 * Trivial helpers to strip endian annotation and compare; the
474 * endianness doesn't actually matter since we just need a stable
475 * order for the RB tree.
476 */
477 static int be32_lt(__be32 a, __be32 b)
478 {
479 return (__force u32) a < (__force u32) b;
480 }
481
482 static int be32_gt(__be32 a, __be32 b)
483 {
484 return (__force u32) a > (__force u32) b;
485 }
486
487 static int be64_lt(__be64 a, __be64 b)
488 {
489 return (__force u64) a < (__force u64) b;
490 }
491
492 static int be64_gt(__be64 a, __be64 b)
493 {
494 return (__force u64) a > (__force u64) b;
495 }
496
497 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
498 {
499 struct rb_node **link = &cm.listen_service_table.rb_node;
500 struct rb_node *parent = NULL;
501 struct cm_id_private *cur_cm_id_priv;
502 __be64 service_id = cm_id_priv->id.service_id;
503 __be64 service_mask = cm_id_priv->id.service_mask;
504 int data_cmp;
505
506 while (*link) {
507 parent = *link;
508 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
509 service_node);
510 data_cmp = cm_compare_data(cm_id_priv->compare_data,
511 cur_cm_id_priv->compare_data);
512 if ((cur_cm_id_priv->id.service_mask & service_id) ==
513 (service_mask & cur_cm_id_priv->id.service_id) &&
514 (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
515 !data_cmp)
516 return cur_cm_id_priv;
517
518 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
519 link = &(*link)->rb_left;
520 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
521 link = &(*link)->rb_right;
522 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
523 link = &(*link)->rb_left;
524 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
525 link = &(*link)->rb_right;
526 else if (data_cmp < 0)
527 link = &(*link)->rb_left;
528 else
529 link = &(*link)->rb_right;
530 }
531 rb_link_node(&cm_id_priv->service_node, parent, link);
532 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
533 return NULL;
534 }
535
536 static struct cm_id_private * cm_find_listen(struct ib_device *device,
537 __be64 service_id,
538 u8 *private_data)
539 {
540 struct rb_node *node = cm.listen_service_table.rb_node;
541 struct cm_id_private *cm_id_priv;
542 int data_cmp;
543
544 while (node) {
545 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
546 data_cmp = cm_compare_private_data(private_data,
547 cm_id_priv->compare_data);
548 if ((cm_id_priv->id.service_mask & service_id) ==
549 cm_id_priv->id.service_id &&
550 (cm_id_priv->id.device == device) && !data_cmp)
551 return cm_id_priv;
552
553 if (device < cm_id_priv->id.device)
554 node = node->rb_left;
555 else if (device > cm_id_priv->id.device)
556 node = node->rb_right;
557 else if (be64_lt(service_id, cm_id_priv->id.service_id))
558 node = node->rb_left;
559 else if (be64_gt(service_id, cm_id_priv->id.service_id))
560 node = node->rb_right;
561 else if (data_cmp < 0)
562 node = node->rb_left;
563 else
564 node = node->rb_right;
565 }
566 return NULL;
567 }
568
569 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
570 *timewait_info)
571 {
572 struct rb_node **link = &cm.remote_id_table.rb_node;
573 struct rb_node *parent = NULL;
574 struct cm_timewait_info *cur_timewait_info;
575 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
576 __be32 remote_id = timewait_info->work.remote_id;
577
578 while (*link) {
579 parent = *link;
580 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
581 remote_id_node);
582 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
583 link = &(*link)->rb_left;
584 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
585 link = &(*link)->rb_right;
586 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
587 link = &(*link)->rb_left;
588 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
589 link = &(*link)->rb_right;
590 else
591 return cur_timewait_info;
592 }
593 timewait_info->inserted_remote_id = 1;
594 rb_link_node(&timewait_info->remote_id_node, parent, link);
595 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
596 return NULL;
597 }
598
599 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
600 __be32 remote_id)
601 {
602 struct rb_node *node = cm.remote_id_table.rb_node;
603 struct cm_timewait_info *timewait_info;
604
605 while (node) {
606 timewait_info = rb_entry(node, struct cm_timewait_info,
607 remote_id_node);
608 if (be32_lt(remote_id, timewait_info->work.remote_id))
609 node = node->rb_left;
610 else if (be32_gt(remote_id, timewait_info->work.remote_id))
611 node = node->rb_right;
612 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
613 node = node->rb_left;
614 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
615 node = node->rb_right;
616 else
617 return timewait_info;
618 }
619 return NULL;
620 }
621
622 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
623 *timewait_info)
624 {
625 struct rb_node **link = &cm.remote_qp_table.rb_node;
626 struct rb_node *parent = NULL;
627 struct cm_timewait_info *cur_timewait_info;
628 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
629 __be32 remote_qpn = timewait_info->remote_qpn;
630
631 while (*link) {
632 parent = *link;
633 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
634 remote_qp_node);
635 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
636 link = &(*link)->rb_left;
637 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
638 link = &(*link)->rb_right;
639 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
640 link = &(*link)->rb_left;
641 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
642 link = &(*link)->rb_right;
643 else
644 return cur_timewait_info;
645 }
646 timewait_info->inserted_remote_qp = 1;
647 rb_link_node(&timewait_info->remote_qp_node, parent, link);
648 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
649 return NULL;
650 }
651
652 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
653 *cm_id_priv)
654 {
655 struct rb_node **link = &cm.remote_sidr_table.rb_node;
656 struct rb_node *parent = NULL;
657 struct cm_id_private *cur_cm_id_priv;
658 union ib_gid *port_gid = &cm_id_priv->av.dgid;
659 __be32 remote_id = cm_id_priv->id.remote_id;
660
661 while (*link) {
662 parent = *link;
663 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
664 sidr_id_node);
665 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
666 link = &(*link)->rb_left;
667 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
668 link = &(*link)->rb_right;
669 else {
670 int cmp;
671 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
672 sizeof *port_gid);
673 if (cmp < 0)
674 link = &(*link)->rb_left;
675 else if (cmp > 0)
676 link = &(*link)->rb_right;
677 else
678 return cur_cm_id_priv;
679 }
680 }
681 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
682 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
683 return NULL;
684 }
685
686 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
687 enum ib_cm_sidr_status status)
688 {
689 struct ib_cm_sidr_rep_param param;
690
691 memset(&param, 0, sizeof param);
692 param.status = status;
693 ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
694 }
695
696 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
697 ib_cm_handler cm_handler,
698 void *context)
699 {
700 struct cm_id_private *cm_id_priv;
701 int ret;
702
703 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
704 if (!cm_id_priv)
705 return ERR_PTR(-ENOMEM);
706
707 cm_id_priv->id.state = IB_CM_IDLE;
708 cm_id_priv->id.device = device;
709 cm_id_priv->id.cm_handler = cm_handler;
710 cm_id_priv->id.context = context;
711 cm_id_priv->id.remote_cm_qpn = 1;
712 ret = cm_alloc_id(cm_id_priv);
713 if (ret)
714 goto error;
715
716 spin_lock_init(&cm_id_priv->lock);
717 init_completion(&cm_id_priv->comp);
718 INIT_LIST_HEAD(&cm_id_priv->work_list);
719 atomic_set(&cm_id_priv->work_count, -1);
720 atomic_set(&cm_id_priv->refcount, 1);
721 return &cm_id_priv->id;
722
723 error:
724 kfree(cm_id_priv);
725 return ERR_PTR(-ENOMEM);
726 }
727 EXPORT_SYMBOL(ib_create_cm_id);
728
729 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
730 {
731 struct cm_work *work;
732
733 if (list_empty(&cm_id_priv->work_list))
734 return NULL;
735
736 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
737 list_del(&work->list);
738 return work;
739 }
740
741 static void cm_free_work(struct cm_work *work)
742 {
743 if (work->mad_recv_wc)
744 ib_free_recv_mad(work->mad_recv_wc);
745 kfree(work);
746 }
747
748 static inline int cm_convert_to_ms(int iba_time)
749 {
750 /* approximate conversion to ms from 4.096us x 2^iba_time */
751 return 1 << max(iba_time - 8, 0);
752 }
753
754 /*
755 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
756 * Because of how ack_timeout is stored, adding one doubles the timeout.
757 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
758 * increment it (round up) only if the other is within 50%.
759 */
760 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
761 {
762 int ack_timeout = packet_life_time + 1;
763
764 if (ack_timeout >= ca_ack_delay)
765 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
766 else
767 ack_timeout = ca_ack_delay +
768 (ack_timeout >= (ca_ack_delay - 1));
769
770 return min(31, ack_timeout);
771 }
772
773 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
774 {
775 if (timewait_info->inserted_remote_id) {
776 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
777 timewait_info->inserted_remote_id = 0;
778 }
779
780 if (timewait_info->inserted_remote_qp) {
781 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
782 timewait_info->inserted_remote_qp = 0;
783 }
784 }
785
786 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
787 {
788 struct cm_timewait_info *timewait_info;
789
790 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
791 if (!timewait_info)
792 return ERR_PTR(-ENOMEM);
793
794 timewait_info->work.local_id = local_id;
795 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
796 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
797 return timewait_info;
798 }
799
800 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
801 {
802 int wait_time;
803 unsigned long flags;
804
805 spin_lock_irqsave(&cm.lock, flags);
806 cm_cleanup_timewait(cm_id_priv->timewait_info);
807 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
808 spin_unlock_irqrestore(&cm.lock, flags);
809
810 /*
811 * The cm_id could be destroyed by the user before we exit timewait.
812 * To protect against this, we search for the cm_id after exiting
813 * timewait before notifying the user that we've exited timewait.
814 */
815 cm_id_priv->id.state = IB_CM_TIMEWAIT;
816 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
817 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
818 msecs_to_jiffies(wait_time));
819 cm_id_priv->timewait_info = NULL;
820 }
821
822 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
823 {
824 unsigned long flags;
825
826 cm_id_priv->id.state = IB_CM_IDLE;
827 if (cm_id_priv->timewait_info) {
828 spin_lock_irqsave(&cm.lock, flags);
829 cm_cleanup_timewait(cm_id_priv->timewait_info);
830 spin_unlock_irqrestore(&cm.lock, flags);
831 kfree(cm_id_priv->timewait_info);
832 cm_id_priv->timewait_info = NULL;
833 }
834 }
835
836 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
837 {
838 struct cm_id_private *cm_id_priv;
839 struct cm_work *work;
840
841 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
842 retest:
843 spin_lock_irq(&cm_id_priv->lock);
844 switch (cm_id->state) {
845 case IB_CM_LISTEN:
846 cm_id->state = IB_CM_IDLE;
847 spin_unlock_irq(&cm_id_priv->lock);
848 spin_lock_irq(&cm.lock);
849 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
850 spin_unlock_irq(&cm.lock);
851 break;
852 case IB_CM_SIDR_REQ_SENT:
853 cm_id->state = IB_CM_IDLE;
854 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
855 spin_unlock_irq(&cm_id_priv->lock);
856 break;
857 case IB_CM_SIDR_REQ_RCVD:
858 spin_unlock_irq(&cm_id_priv->lock);
859 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
860 break;
861 case IB_CM_REQ_SENT:
862 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
863 spin_unlock_irq(&cm_id_priv->lock);
864 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
865 &cm_id_priv->id.device->node_guid,
866 sizeof cm_id_priv->id.device->node_guid,
867 NULL, 0);
868 break;
869 case IB_CM_REQ_RCVD:
870 if (err == -ENOMEM) {
871 /* Do not reject to allow future retries. */
872 cm_reset_to_idle(cm_id_priv);
873 spin_unlock_irq(&cm_id_priv->lock);
874 } else {
875 spin_unlock_irq(&cm_id_priv->lock);
876 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
877 NULL, 0, NULL, 0);
878 }
879 break;
880 case IB_CM_MRA_REQ_RCVD:
881 case IB_CM_REP_SENT:
882 case IB_CM_MRA_REP_RCVD:
883 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
884 /* Fall through */
885 case IB_CM_MRA_REQ_SENT:
886 case IB_CM_REP_RCVD:
887 case IB_CM_MRA_REP_SENT:
888 spin_unlock_irq(&cm_id_priv->lock);
889 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
890 NULL, 0, NULL, 0);
891 break;
892 case IB_CM_ESTABLISHED:
893 spin_unlock_irq(&cm_id_priv->lock);
894 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT)
895 break;
896 ib_send_cm_dreq(cm_id, NULL, 0);
897 goto retest;
898 case IB_CM_DREQ_SENT:
899 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
900 cm_enter_timewait(cm_id_priv);
901 spin_unlock_irq(&cm_id_priv->lock);
902 break;
903 case IB_CM_DREQ_RCVD:
904 spin_unlock_irq(&cm_id_priv->lock);
905 ib_send_cm_drep(cm_id, NULL, 0);
906 break;
907 default:
908 spin_unlock_irq(&cm_id_priv->lock);
909 break;
910 }
911
912 cm_free_id(cm_id->local_id);
913 cm_deref_id(cm_id_priv);
914 wait_for_completion(&cm_id_priv->comp);
915 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
916 cm_free_work(work);
917 kfree(cm_id_priv->compare_data);
918 kfree(cm_id_priv->private_data);
919 kfree(cm_id_priv);
920 }
921
922 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
923 {
924 cm_destroy_id(cm_id, 0);
925 }
926 EXPORT_SYMBOL(ib_destroy_cm_id);
927
928 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
929 struct ib_cm_compare_data *compare_data)
930 {
931 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
932 unsigned long flags;
933 int ret = 0;
934
935 service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
936 service_id &= service_mask;
937 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
938 (service_id != IB_CM_ASSIGN_SERVICE_ID))
939 return -EINVAL;
940
941 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
942 if (cm_id->state != IB_CM_IDLE)
943 return -EINVAL;
944
945 if (compare_data) {
946 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
947 GFP_KERNEL);
948 if (!cm_id_priv->compare_data)
949 return -ENOMEM;
950 cm_mask_copy(cm_id_priv->compare_data->data,
951 compare_data->data, compare_data->mask);
952 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
953 IB_CM_COMPARE_SIZE);
954 }
955
956 cm_id->state = IB_CM_LISTEN;
957
958 spin_lock_irqsave(&cm.lock, flags);
959 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
960 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
961 cm_id->service_mask = ~cpu_to_be64(0);
962 } else {
963 cm_id->service_id = service_id;
964 cm_id->service_mask = service_mask;
965 }
966 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
967 spin_unlock_irqrestore(&cm.lock, flags);
968
969 if (cur_cm_id_priv) {
970 cm_id->state = IB_CM_IDLE;
971 kfree(cm_id_priv->compare_data);
972 cm_id_priv->compare_data = NULL;
973 ret = -EBUSY;
974 }
975 return ret;
976 }
977 EXPORT_SYMBOL(ib_cm_listen);
978
979 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
980 enum cm_msg_sequence msg_seq)
981 {
982 u64 hi_tid, low_tid;
983
984 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
985 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
986 (msg_seq << 30));
987 return cpu_to_be64(hi_tid | low_tid);
988 }
989
990 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
991 __be16 attr_id, __be64 tid)
992 {
993 hdr->base_version = IB_MGMT_BASE_VERSION;
994 hdr->mgmt_class = IB_MGMT_CLASS_CM;
995 hdr->class_version = IB_CM_CLASS_VERSION;
996 hdr->method = IB_MGMT_METHOD_SEND;
997 hdr->attr_id = attr_id;
998 hdr->tid = tid;
999 }
1000
1001 static void cm_format_req(struct cm_req_msg *req_msg,
1002 struct cm_id_private *cm_id_priv,
1003 struct ib_cm_req_param *param)
1004 {
1005 struct ib_sa_path_rec *pri_path = param->primary_path;
1006 struct ib_sa_path_rec *alt_path = param->alternate_path;
1007
1008 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1009 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
1010
1011 req_msg->local_comm_id = cm_id_priv->id.local_id;
1012 req_msg->service_id = param->service_id;
1013 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1014 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
1015 cm_req_set_init_depth(req_msg, param->initiator_depth);
1016 cm_req_set_remote_resp_timeout(req_msg,
1017 param->remote_cm_response_timeout);
1018 cm_req_set_qp_type(req_msg, param->qp_type);
1019 cm_req_set_flow_ctrl(req_msg, param->flow_control);
1020 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
1021 cm_req_set_local_resp_timeout(req_msg,
1022 param->local_cm_response_timeout);
1023 req_msg->pkey = param->primary_path->pkey;
1024 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
1025 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
1026
1027 if (param->qp_type != IB_QPT_XRC_INI) {
1028 cm_req_set_resp_res(req_msg, param->responder_resources);
1029 cm_req_set_retry_count(req_msg, param->retry_count);
1030 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
1031 cm_req_set_srq(req_msg, param->srq);
1032 }
1033
1034 if (pri_path->hop_limit <= 1) {
1035 req_msg->primary_local_lid = pri_path->slid;
1036 req_msg->primary_remote_lid = pri_path->dlid;
1037 } else {
1038 /* Work-around until there's a way to obtain remote LID info */
1039 req_msg->primary_local_lid = IB_LID_PERMISSIVE;
1040 req_msg->primary_remote_lid = IB_LID_PERMISSIVE;
1041 }
1042 req_msg->primary_local_gid = pri_path->sgid;
1043 req_msg->primary_remote_gid = pri_path->dgid;
1044 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label);
1045 cm_req_set_primary_packet_rate(req_msg, pri_path->rate);
1046 req_msg->primary_traffic_class = pri_path->traffic_class;
1047 req_msg->primary_hop_limit = pri_path->hop_limit;
1048 cm_req_set_primary_sl(req_msg, pri_path->sl);
1049 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1));
1050 cm_req_set_primary_local_ack_timeout(req_msg,
1051 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1052 pri_path->packet_life_time));
1053
1054 if (alt_path) {
1055 if (alt_path->hop_limit <= 1) {
1056 req_msg->alt_local_lid = alt_path->slid;
1057 req_msg->alt_remote_lid = alt_path->dlid;
1058 } else {
1059 req_msg->alt_local_lid = IB_LID_PERMISSIVE;
1060 req_msg->alt_remote_lid = IB_LID_PERMISSIVE;
1061 }
1062 req_msg->alt_local_gid = alt_path->sgid;
1063 req_msg->alt_remote_gid = alt_path->dgid;
1064 cm_req_set_alt_flow_label(req_msg,
1065 alt_path->flow_label);
1066 cm_req_set_alt_packet_rate(req_msg, alt_path->rate);
1067 req_msg->alt_traffic_class = alt_path->traffic_class;
1068 req_msg->alt_hop_limit = alt_path->hop_limit;
1069 cm_req_set_alt_sl(req_msg, alt_path->sl);
1070 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1));
1071 cm_req_set_alt_local_ack_timeout(req_msg,
1072 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1073 alt_path->packet_life_time));
1074 }
1075
1076 if (param->private_data && param->private_data_len)
1077 memcpy(req_msg->private_data, param->private_data,
1078 param->private_data_len);
1079 }
1080
1081 static int cm_validate_req_param(struct ib_cm_req_param *param)
1082 {
1083 /* peer-to-peer not supported */
1084 if (param->peer_to_peer)
1085 return -EINVAL;
1086
1087 if (!param->primary_path)
1088 return -EINVAL;
1089
1090 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1091 param->qp_type != IB_QPT_XRC_INI)
1092 return -EINVAL;
1093
1094 if (param->private_data &&
1095 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1096 return -EINVAL;
1097
1098 if (param->alternate_path &&
1099 (param->alternate_path->pkey != param->primary_path->pkey ||
1100 param->alternate_path->mtu != param->primary_path->mtu))
1101 return -EINVAL;
1102
1103 return 0;
1104 }
1105
1106 int ib_send_cm_req(struct ib_cm_id *cm_id,
1107 struct ib_cm_req_param *param)
1108 {
1109 struct cm_id_private *cm_id_priv;
1110 struct cm_req_msg *req_msg;
1111 unsigned long flags;
1112 int ret;
1113
1114 ret = cm_validate_req_param(param);
1115 if (ret)
1116 return ret;
1117
1118 /* Verify that we're not in timewait. */
1119 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1120 spin_lock_irqsave(&cm_id_priv->lock, flags);
1121 if (cm_id->state != IB_CM_IDLE) {
1122 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1123 ret = -EINVAL;
1124 goto out;
1125 }
1126 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1127
1128 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1129 id.local_id);
1130 if (IS_ERR(cm_id_priv->timewait_info)) {
1131 ret = PTR_ERR(cm_id_priv->timewait_info);
1132 goto out;
1133 }
1134
1135 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
1136 if (ret)
1137 goto error1;
1138 if (param->alternate_path) {
1139 ret = cm_init_av_by_path(param->alternate_path,
1140 &cm_id_priv->alt_av);
1141 if (ret)
1142 goto error1;
1143 }
1144 cm_id->service_id = param->service_id;
1145 cm_id->service_mask = ~cpu_to_be64(0);
1146 cm_id_priv->timeout_ms = cm_convert_to_ms(
1147 param->primary_path->packet_life_time) * 2 +
1148 cm_convert_to_ms(
1149 param->remote_cm_response_timeout);
1150 cm_id_priv->max_cm_retries = param->max_cm_retries;
1151 cm_id_priv->initiator_depth = param->initiator_depth;
1152 cm_id_priv->responder_resources = param->responder_resources;
1153 cm_id_priv->retry_count = param->retry_count;
1154 cm_id_priv->path_mtu = param->primary_path->mtu;
1155 cm_id_priv->pkey = param->primary_path->pkey;
1156 cm_id_priv->qp_type = param->qp_type;
1157
1158 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1159 if (ret)
1160 goto error1;
1161
1162 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1163 cm_format_req(req_msg, cm_id_priv, param);
1164 cm_id_priv->tid = req_msg->hdr.tid;
1165 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1166 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1167
1168 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1169 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1170
1171 spin_lock_irqsave(&cm_id_priv->lock, flags);
1172 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1173 if (ret) {
1174 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1175 goto error2;
1176 }
1177 BUG_ON(cm_id->state != IB_CM_IDLE);
1178 cm_id->state = IB_CM_REQ_SENT;
1179 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1180 return 0;
1181
1182 error2: cm_free_msg(cm_id_priv->msg);
1183 error1: kfree(cm_id_priv->timewait_info);
1184 out: return ret;
1185 }
1186 EXPORT_SYMBOL(ib_send_cm_req);
1187
1188 static int cm_issue_rej(struct cm_port *port,
1189 struct ib_mad_recv_wc *mad_recv_wc,
1190 enum ib_cm_rej_reason reason,
1191 enum cm_msg_response msg_rejected,
1192 void *ari, u8 ari_length)
1193 {
1194 struct ib_mad_send_buf *msg = NULL;
1195 struct cm_rej_msg *rej_msg, *rcv_msg;
1196 int ret;
1197
1198 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1199 if (ret)
1200 return ret;
1201
1202 /* We just need common CM header information. Cast to any message. */
1203 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1204 rej_msg = (struct cm_rej_msg *) msg->mad;
1205
1206 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1207 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1208 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1209 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1210 rej_msg->reason = cpu_to_be16(reason);
1211
1212 if (ari && ari_length) {
1213 cm_rej_set_reject_info_len(rej_msg, ari_length);
1214 memcpy(rej_msg->ari, ari, ari_length);
1215 }
1216
1217 ret = ib_post_send_mad(msg, NULL);
1218 if (ret)
1219 cm_free_msg(msg);
1220
1221 return ret;
1222 }
1223
1224 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1225 __be32 local_qpn, __be32 remote_qpn)
1226 {
1227 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1228 ((local_ca_guid == remote_ca_guid) &&
1229 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1230 }
1231
1232 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1233 struct ib_sa_path_rec *primary_path,
1234 struct ib_sa_path_rec *alt_path)
1235 {
1236 memset(primary_path, 0, sizeof *primary_path);
1237 primary_path->dgid = req_msg->primary_local_gid;
1238 primary_path->sgid = req_msg->primary_remote_gid;
1239 primary_path->dlid = req_msg->primary_local_lid;
1240 primary_path->slid = req_msg->primary_remote_lid;
1241 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1242 primary_path->hop_limit = req_msg->primary_hop_limit;
1243 primary_path->traffic_class = req_msg->primary_traffic_class;
1244 primary_path->reversible = 1;
1245 primary_path->pkey = req_msg->pkey;
1246 primary_path->sl = cm_req_get_primary_sl(req_msg);
1247 primary_path->mtu_selector = IB_SA_EQ;
1248 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1249 primary_path->rate_selector = IB_SA_EQ;
1250 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1251 primary_path->packet_life_time_selector = IB_SA_EQ;
1252 primary_path->packet_life_time =
1253 cm_req_get_primary_local_ack_timeout(req_msg);
1254 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1255
1256 if (req_msg->alt_local_lid) {
1257 memset(alt_path, 0, sizeof *alt_path);
1258 alt_path->dgid = req_msg->alt_local_gid;
1259 alt_path->sgid = req_msg->alt_remote_gid;
1260 alt_path->dlid = req_msg->alt_local_lid;
1261 alt_path->slid = req_msg->alt_remote_lid;
1262 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1263 alt_path->hop_limit = req_msg->alt_hop_limit;
1264 alt_path->traffic_class = req_msg->alt_traffic_class;
1265 alt_path->reversible = 1;
1266 alt_path->pkey = req_msg->pkey;
1267 alt_path->sl = cm_req_get_alt_sl(req_msg);
1268 alt_path->mtu_selector = IB_SA_EQ;
1269 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1270 alt_path->rate_selector = IB_SA_EQ;
1271 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1272 alt_path->packet_life_time_selector = IB_SA_EQ;
1273 alt_path->packet_life_time =
1274 cm_req_get_alt_local_ack_timeout(req_msg);
1275 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1276 }
1277 }
1278
1279 static void cm_format_req_event(struct cm_work *work,
1280 struct cm_id_private *cm_id_priv,
1281 struct ib_cm_id *listen_id)
1282 {
1283 struct cm_req_msg *req_msg;
1284 struct ib_cm_req_event_param *param;
1285
1286 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1287 param = &work->cm_event.param.req_rcvd;
1288 param->listen_id = listen_id;
1289 param->port = cm_id_priv->av.port->port_num;
1290 param->primary_path = &work->path[0];
1291 if (req_msg->alt_local_lid)
1292 param->alternate_path = &work->path[1];
1293 else
1294 param->alternate_path = NULL;
1295 param->remote_ca_guid = req_msg->local_ca_guid;
1296 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1297 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1298 param->qp_type = cm_req_get_qp_type(req_msg);
1299 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1300 param->responder_resources = cm_req_get_init_depth(req_msg);
1301 param->initiator_depth = cm_req_get_resp_res(req_msg);
1302 param->local_cm_response_timeout =
1303 cm_req_get_remote_resp_timeout(req_msg);
1304 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1305 param->remote_cm_response_timeout =
1306 cm_req_get_local_resp_timeout(req_msg);
1307 param->retry_count = cm_req_get_retry_count(req_msg);
1308 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1309 param->srq = cm_req_get_srq(req_msg);
1310 work->cm_event.private_data = &req_msg->private_data;
1311 }
1312
1313 static void cm_process_work(struct cm_id_private *cm_id_priv,
1314 struct cm_work *work)
1315 {
1316 int ret;
1317
1318 /* We will typically only have the current event to report. */
1319 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1320 cm_free_work(work);
1321
1322 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1323 spin_lock_irq(&cm_id_priv->lock);
1324 work = cm_dequeue_work(cm_id_priv);
1325 spin_unlock_irq(&cm_id_priv->lock);
1326 BUG_ON(!work);
1327 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1328 &work->cm_event);
1329 cm_free_work(work);
1330 }
1331 cm_deref_id(cm_id_priv);
1332 if (ret)
1333 cm_destroy_id(&cm_id_priv->id, ret);
1334 }
1335
1336 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1337 struct cm_id_private *cm_id_priv,
1338 enum cm_msg_response msg_mraed, u8 service_timeout,
1339 const void *private_data, u8 private_data_len)
1340 {
1341 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1342 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1343 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1344 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1345 cm_mra_set_service_timeout(mra_msg, service_timeout);
1346
1347 if (private_data && private_data_len)
1348 memcpy(mra_msg->private_data, private_data, private_data_len);
1349 }
1350
1351 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1352 struct cm_id_private *cm_id_priv,
1353 enum ib_cm_rej_reason reason,
1354 void *ari,
1355 u8 ari_length,
1356 const void *private_data,
1357 u8 private_data_len)
1358 {
1359 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1360 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1361
1362 switch(cm_id_priv->id.state) {
1363 case IB_CM_REQ_RCVD:
1364 rej_msg->local_comm_id = 0;
1365 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1366 break;
1367 case IB_CM_MRA_REQ_SENT:
1368 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1369 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1370 break;
1371 case IB_CM_REP_RCVD:
1372 case IB_CM_MRA_REP_SENT:
1373 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1374 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1375 break;
1376 default:
1377 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1378 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1379 break;
1380 }
1381
1382 rej_msg->reason = cpu_to_be16(reason);
1383 if (ari && ari_length) {
1384 cm_rej_set_reject_info_len(rej_msg, ari_length);
1385 memcpy(rej_msg->ari, ari, ari_length);
1386 }
1387
1388 if (private_data && private_data_len)
1389 memcpy(rej_msg->private_data, private_data, private_data_len);
1390 }
1391
1392 static void cm_dup_req_handler(struct cm_work *work,
1393 struct cm_id_private *cm_id_priv)
1394 {
1395 struct ib_mad_send_buf *msg = NULL;
1396 int ret;
1397
1398 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1399 counter[CM_REQ_COUNTER]);
1400
1401 /* Quick state check to discard duplicate REQs. */
1402 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1403 return;
1404
1405 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1406 if (ret)
1407 return;
1408
1409 spin_lock_irq(&cm_id_priv->lock);
1410 switch (cm_id_priv->id.state) {
1411 case IB_CM_MRA_REQ_SENT:
1412 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1413 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1414 cm_id_priv->private_data,
1415 cm_id_priv->private_data_len);
1416 break;
1417 case IB_CM_TIMEWAIT:
1418 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1419 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1420 break;
1421 default:
1422 goto unlock;
1423 }
1424 spin_unlock_irq(&cm_id_priv->lock);
1425
1426 ret = ib_post_send_mad(msg, NULL);
1427 if (ret)
1428 goto free;
1429 return;
1430
1431 unlock: spin_unlock_irq(&cm_id_priv->lock);
1432 free: cm_free_msg(msg);
1433 }
1434
1435 static struct cm_id_private * cm_match_req(struct cm_work *work,
1436 struct cm_id_private *cm_id_priv)
1437 {
1438 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1439 struct cm_timewait_info *timewait_info;
1440 struct cm_req_msg *req_msg;
1441
1442 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1443
1444 /* Check for possible duplicate REQ. */
1445 spin_lock_irq(&cm.lock);
1446 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1447 if (timewait_info) {
1448 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1449 timewait_info->work.remote_id);
1450 spin_unlock_irq(&cm.lock);
1451 if (cur_cm_id_priv) {
1452 cm_dup_req_handler(work, cur_cm_id_priv);
1453 cm_deref_id(cur_cm_id_priv);
1454 }
1455 return NULL;
1456 }
1457
1458 /* Check for stale connections. */
1459 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1460 if (timewait_info) {
1461 cm_cleanup_timewait(cm_id_priv->timewait_info);
1462 spin_unlock_irq(&cm.lock);
1463 cm_issue_rej(work->port, work->mad_recv_wc,
1464 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1465 NULL, 0);
1466 return NULL;
1467 }
1468
1469 /* Find matching listen request. */
1470 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1471 req_msg->service_id,
1472 req_msg->private_data);
1473 if (!listen_cm_id_priv) {
1474 cm_cleanup_timewait(cm_id_priv->timewait_info);
1475 spin_unlock_irq(&cm.lock);
1476 cm_issue_rej(work->port, work->mad_recv_wc,
1477 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1478 NULL, 0);
1479 goto out;
1480 }
1481 atomic_inc(&listen_cm_id_priv->refcount);
1482 atomic_inc(&cm_id_priv->refcount);
1483 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1484 atomic_inc(&cm_id_priv->work_count);
1485 spin_unlock_irq(&cm.lock);
1486 out:
1487 return listen_cm_id_priv;
1488 }
1489
1490 /*
1491 * Work-around for inter-subnet connections. If the LIDs are permissive,
1492 * we need to override the LID/SL data in the REQ with the LID information
1493 * in the work completion.
1494 */
1495 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
1496 {
1497 if (!cm_req_get_primary_subnet_local(req_msg)) {
1498 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) {
1499 req_msg->primary_local_lid = cpu_to_be16(wc->slid);
1500 cm_req_set_primary_sl(req_msg, wc->sl);
1501 }
1502
1503 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE)
1504 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1505 }
1506
1507 if (!cm_req_get_alt_subnet_local(req_msg)) {
1508 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) {
1509 req_msg->alt_local_lid = cpu_to_be16(wc->slid);
1510 cm_req_set_alt_sl(req_msg, wc->sl);
1511 }
1512
1513 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE)
1514 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1515 }
1516 }
1517
1518 static int cm_req_handler(struct cm_work *work)
1519 {
1520 struct ib_cm_id *cm_id;
1521 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1522 struct cm_req_msg *req_msg;
1523 int ret;
1524
1525 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1526
1527 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
1528 if (IS_ERR(cm_id))
1529 return PTR_ERR(cm_id);
1530
1531 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1532 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1533 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1534 work->mad_recv_wc->recv_buf.grh,
1535 &cm_id_priv->av);
1536 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1537 id.local_id);
1538 if (IS_ERR(cm_id_priv->timewait_info)) {
1539 ret = PTR_ERR(cm_id_priv->timewait_info);
1540 goto destroy;
1541 }
1542 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1543 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1544 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1545
1546 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1547 if (!listen_cm_id_priv) {
1548 ret = -EINVAL;
1549 kfree(cm_id_priv->timewait_info);
1550 goto destroy;
1551 }
1552
1553 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1554 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1555 cm_id_priv->id.service_id = req_msg->service_id;
1556 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1557
1558 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
1559 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1560 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1561 if (ret) {
1562 ib_get_cached_gid(work->port->cm_dev->ib_device,
1563 work->port->port_num, 0, &work->path[0].sgid);
1564 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1565 &work->path[0].sgid, sizeof work->path[0].sgid,
1566 NULL, 0);
1567 goto rejected;
1568 }
1569 if (req_msg->alt_local_lid) {
1570 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1571 if (ret) {
1572 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1573 &work->path[0].sgid,
1574 sizeof work->path[0].sgid, NULL, 0);
1575 goto rejected;
1576 }
1577 }
1578 cm_id_priv->tid = req_msg->hdr.tid;
1579 cm_id_priv->timeout_ms = cm_convert_to_ms(
1580 cm_req_get_local_resp_timeout(req_msg));
1581 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1582 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1583 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1584 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1585 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1586 cm_id_priv->pkey = req_msg->pkey;
1587 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1588 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1589 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1590 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1591
1592 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1593 cm_process_work(cm_id_priv, work);
1594 cm_deref_id(listen_cm_id_priv);
1595 return 0;
1596
1597 rejected:
1598 atomic_dec(&cm_id_priv->refcount);
1599 cm_deref_id(listen_cm_id_priv);
1600 destroy:
1601 ib_destroy_cm_id(cm_id);
1602 return ret;
1603 }
1604
1605 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1606 struct cm_id_private *cm_id_priv,
1607 struct ib_cm_rep_param *param)
1608 {
1609 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1610 rep_msg->local_comm_id = cm_id_priv->id.local_id;
1611 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1612 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1613 rep_msg->resp_resources = param->responder_resources;
1614 cm_rep_set_target_ack_delay(rep_msg,
1615 cm_id_priv->av.port->cm_dev->ack_delay);
1616 cm_rep_set_failover(rep_msg, param->failover_accepted);
1617 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1618 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1619
1620 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
1621 rep_msg->initiator_depth = param->initiator_depth;
1622 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1623 cm_rep_set_srq(rep_msg, param->srq);
1624 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1625 } else {
1626 cm_rep_set_srq(rep_msg, 1);
1627 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num));
1628 }
1629
1630 if (param->private_data && param->private_data_len)
1631 memcpy(rep_msg->private_data, param->private_data,
1632 param->private_data_len);
1633 }
1634
1635 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1636 struct ib_cm_rep_param *param)
1637 {
1638 struct cm_id_private *cm_id_priv;
1639 struct ib_mad_send_buf *msg;
1640 struct cm_rep_msg *rep_msg;
1641 unsigned long flags;
1642 int ret;
1643
1644 if (param->private_data &&
1645 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1646 return -EINVAL;
1647
1648 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1649 spin_lock_irqsave(&cm_id_priv->lock, flags);
1650 if (cm_id->state != IB_CM_REQ_RCVD &&
1651 cm_id->state != IB_CM_MRA_REQ_SENT) {
1652 ret = -EINVAL;
1653 goto out;
1654 }
1655
1656 ret = cm_alloc_msg(cm_id_priv, &msg);
1657 if (ret)
1658 goto out;
1659
1660 rep_msg = (struct cm_rep_msg *) msg->mad;
1661 cm_format_rep(rep_msg, cm_id_priv, param);
1662 msg->timeout_ms = cm_id_priv->timeout_ms;
1663 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1664
1665 ret = ib_post_send_mad(msg, NULL);
1666 if (ret) {
1667 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1668 cm_free_msg(msg);
1669 return ret;
1670 }
1671
1672 cm_id->state = IB_CM_REP_SENT;
1673 cm_id_priv->msg = msg;
1674 cm_id_priv->initiator_depth = param->initiator_depth;
1675 cm_id_priv->responder_resources = param->responder_resources;
1676 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1677 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
1678
1679 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1680 return ret;
1681 }
1682 EXPORT_SYMBOL(ib_send_cm_rep);
1683
1684 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1685 struct cm_id_private *cm_id_priv,
1686 const void *private_data,
1687 u8 private_data_len)
1688 {
1689 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1690 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1691 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1692
1693 if (private_data && private_data_len)
1694 memcpy(rtu_msg->private_data, private_data, private_data_len);
1695 }
1696
1697 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1698 const void *private_data,
1699 u8 private_data_len)
1700 {
1701 struct cm_id_private *cm_id_priv;
1702 struct ib_mad_send_buf *msg;
1703 unsigned long flags;
1704 void *data;
1705 int ret;
1706
1707 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1708 return -EINVAL;
1709
1710 data = cm_copy_private_data(private_data, private_data_len);
1711 if (IS_ERR(data))
1712 return PTR_ERR(data);
1713
1714 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1715 spin_lock_irqsave(&cm_id_priv->lock, flags);
1716 if (cm_id->state != IB_CM_REP_RCVD &&
1717 cm_id->state != IB_CM_MRA_REP_SENT) {
1718 ret = -EINVAL;
1719 goto error;
1720 }
1721
1722 ret = cm_alloc_msg(cm_id_priv, &msg);
1723 if (ret)
1724 goto error;
1725
1726 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1727 private_data, private_data_len);
1728
1729 ret = ib_post_send_mad(msg, NULL);
1730 if (ret) {
1731 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1732 cm_free_msg(msg);
1733 kfree(data);
1734 return ret;
1735 }
1736
1737 cm_id->state = IB_CM_ESTABLISHED;
1738 cm_set_private_data(cm_id_priv, data, private_data_len);
1739 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1740 return 0;
1741
1742 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1743 kfree(data);
1744 return ret;
1745 }
1746 EXPORT_SYMBOL(ib_send_cm_rtu);
1747
1748 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
1749 {
1750 struct cm_rep_msg *rep_msg;
1751 struct ib_cm_rep_event_param *param;
1752
1753 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1754 param = &work->cm_event.param.rep_rcvd;
1755 param->remote_ca_guid = rep_msg->local_ca_guid;
1756 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1757 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
1758 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1759 param->responder_resources = rep_msg->initiator_depth;
1760 param->initiator_depth = rep_msg->resp_resources;
1761 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1762 param->failover_accepted = cm_rep_get_failover(rep_msg);
1763 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1764 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1765 param->srq = cm_rep_get_srq(rep_msg);
1766 work->cm_event.private_data = &rep_msg->private_data;
1767 }
1768
1769 static void cm_dup_rep_handler(struct cm_work *work)
1770 {
1771 struct cm_id_private *cm_id_priv;
1772 struct cm_rep_msg *rep_msg;
1773 struct ib_mad_send_buf *msg = NULL;
1774 int ret;
1775
1776 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1777 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1778 rep_msg->local_comm_id);
1779 if (!cm_id_priv)
1780 return;
1781
1782 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1783 counter[CM_REP_COUNTER]);
1784 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1785 if (ret)
1786 goto deref;
1787
1788 spin_lock_irq(&cm_id_priv->lock);
1789 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1790 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1791 cm_id_priv->private_data,
1792 cm_id_priv->private_data_len);
1793 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1794 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1795 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1796 cm_id_priv->private_data,
1797 cm_id_priv->private_data_len);
1798 else
1799 goto unlock;
1800 spin_unlock_irq(&cm_id_priv->lock);
1801
1802 ret = ib_post_send_mad(msg, NULL);
1803 if (ret)
1804 goto free;
1805 goto deref;
1806
1807 unlock: spin_unlock_irq(&cm_id_priv->lock);
1808 free: cm_free_msg(msg);
1809 deref: cm_deref_id(cm_id_priv);
1810 }
1811
1812 static int cm_rep_handler(struct cm_work *work)
1813 {
1814 struct cm_id_private *cm_id_priv;
1815 struct cm_rep_msg *rep_msg;
1816 int ret;
1817
1818 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1819 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1820 if (!cm_id_priv) {
1821 cm_dup_rep_handler(work);
1822 return -EINVAL;
1823 }
1824
1825 cm_format_rep_event(work, cm_id_priv->qp_type);
1826
1827 spin_lock_irq(&cm_id_priv->lock);
1828 switch (cm_id_priv->id.state) {
1829 case IB_CM_REQ_SENT:
1830 case IB_CM_MRA_REQ_RCVD:
1831 break;
1832 default:
1833 spin_unlock_irq(&cm_id_priv->lock);
1834 ret = -EINVAL;
1835 goto error;
1836 }
1837
1838 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1839 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1840 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
1841
1842 spin_lock(&cm.lock);
1843 /* Check for duplicate REP. */
1844 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1845 spin_unlock(&cm.lock);
1846 spin_unlock_irq(&cm_id_priv->lock);
1847 ret = -EINVAL;
1848 goto error;
1849 }
1850 /* Check for a stale connection. */
1851 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1852 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1853 &cm.remote_id_table);
1854 cm_id_priv->timewait_info->inserted_remote_id = 0;
1855 spin_unlock(&cm.lock);
1856 spin_unlock_irq(&cm_id_priv->lock);
1857 cm_issue_rej(work->port, work->mad_recv_wc,
1858 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1859 NULL, 0);
1860 ret = -EINVAL;
1861 goto error;
1862 }
1863 spin_unlock(&cm.lock);
1864
1865 cm_id_priv->id.state = IB_CM_REP_RCVD;
1866 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1867 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
1868 cm_id_priv->initiator_depth = rep_msg->resp_resources;
1869 cm_id_priv->responder_resources = rep_msg->initiator_depth;
1870 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1871 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1872 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1873 cm_id_priv->av.timeout =
1874 cm_ack_timeout(cm_id_priv->target_ack_delay,
1875 cm_id_priv->av.timeout - 1);
1876 cm_id_priv->alt_av.timeout =
1877 cm_ack_timeout(cm_id_priv->target_ack_delay,
1878 cm_id_priv->alt_av.timeout - 1);
1879
1880 /* todo: handle peer_to_peer */
1881
1882 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1883 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1884 if (!ret)
1885 list_add_tail(&work->list, &cm_id_priv->work_list);
1886 spin_unlock_irq(&cm_id_priv->lock);
1887
1888 if (ret)
1889 cm_process_work(cm_id_priv, work);
1890 else
1891 cm_deref_id(cm_id_priv);
1892 return 0;
1893
1894 error:
1895 cm_deref_id(cm_id_priv);
1896 return ret;
1897 }
1898
1899 static int cm_establish_handler(struct cm_work *work)
1900 {
1901 struct cm_id_private *cm_id_priv;
1902 int ret;
1903
1904 /* See comment in cm_establish about lookup. */
1905 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1906 if (!cm_id_priv)
1907 return -EINVAL;
1908
1909 spin_lock_irq(&cm_id_priv->lock);
1910 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1911 spin_unlock_irq(&cm_id_priv->lock);
1912 goto out;
1913 }
1914
1915 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1916 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1917 if (!ret)
1918 list_add_tail(&work->list, &cm_id_priv->work_list);
1919 spin_unlock_irq(&cm_id_priv->lock);
1920
1921 if (ret)
1922 cm_process_work(cm_id_priv, work);
1923 else
1924 cm_deref_id(cm_id_priv);
1925 return 0;
1926 out:
1927 cm_deref_id(cm_id_priv);
1928 return -EINVAL;
1929 }
1930
1931 static int cm_rtu_handler(struct cm_work *work)
1932 {
1933 struct cm_id_private *cm_id_priv;
1934 struct cm_rtu_msg *rtu_msg;
1935 int ret;
1936
1937 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1938 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1939 rtu_msg->local_comm_id);
1940 if (!cm_id_priv)
1941 return -EINVAL;
1942
1943 work->cm_event.private_data = &rtu_msg->private_data;
1944
1945 spin_lock_irq(&cm_id_priv->lock);
1946 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1947 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1948 spin_unlock_irq(&cm_id_priv->lock);
1949 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1950 counter[CM_RTU_COUNTER]);
1951 goto out;
1952 }
1953 cm_id_priv->id.state = IB_CM_ESTABLISHED;
1954
1955 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1956 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1957 if (!ret)
1958 list_add_tail(&work->list, &cm_id_priv->work_list);
1959 spin_unlock_irq(&cm_id_priv->lock);
1960
1961 if (ret)
1962 cm_process_work(cm_id_priv, work);
1963 else
1964 cm_deref_id(cm_id_priv);
1965 return 0;
1966 out:
1967 cm_deref_id(cm_id_priv);
1968 return -EINVAL;
1969 }
1970
1971 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1972 struct cm_id_private *cm_id_priv,
1973 const void *private_data,
1974 u8 private_data_len)
1975 {
1976 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1977 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1978 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1979 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1980 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1981
1982 if (private_data && private_data_len)
1983 memcpy(dreq_msg->private_data, private_data, private_data_len);
1984 }
1985
1986 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1987 const void *private_data,
1988 u8 private_data_len)
1989 {
1990 struct cm_id_private *cm_id_priv;
1991 struct ib_mad_send_buf *msg;
1992 unsigned long flags;
1993 int ret;
1994
1995 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1996 return -EINVAL;
1997
1998 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1999 spin_lock_irqsave(&cm_id_priv->lock, flags);
2000 if (cm_id->state != IB_CM_ESTABLISHED) {
2001 ret = -EINVAL;
2002 goto out;
2003 }
2004
2005 if (cm_id->lap_state == IB_CM_LAP_SENT ||
2006 cm_id->lap_state == IB_CM_MRA_LAP_RCVD)
2007 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2008
2009 ret = cm_alloc_msg(cm_id_priv, &msg);
2010 if (ret) {
2011 cm_enter_timewait(cm_id_priv);
2012 goto out;
2013 }
2014
2015 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2016 private_data, private_data_len);
2017 msg->timeout_ms = cm_id_priv->timeout_ms;
2018 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2019
2020 ret = ib_post_send_mad(msg, NULL);
2021 if (ret) {
2022 cm_enter_timewait(cm_id_priv);
2023 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2024 cm_free_msg(msg);
2025 return ret;
2026 }
2027
2028 cm_id->state = IB_CM_DREQ_SENT;
2029 cm_id_priv->msg = msg;
2030 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2031 return ret;
2032 }
2033 EXPORT_SYMBOL(ib_send_cm_dreq);
2034
2035 static void cm_format_drep(struct cm_drep_msg *drep_msg,
2036 struct cm_id_private *cm_id_priv,
2037 const void *private_data,
2038 u8 private_data_len)
2039 {
2040 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2041 drep_msg->local_comm_id = cm_id_priv->id.local_id;
2042 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2043
2044 if (private_data && private_data_len)
2045 memcpy(drep_msg->private_data, private_data, private_data_len);
2046 }
2047
2048 int ib_send_cm_drep(struct ib_cm_id *cm_id,
2049 const void *private_data,
2050 u8 private_data_len)
2051 {
2052 struct cm_id_private *cm_id_priv;
2053 struct ib_mad_send_buf *msg;
2054 unsigned long flags;
2055 void *data;
2056 int ret;
2057
2058 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2059 return -EINVAL;
2060
2061 data = cm_copy_private_data(private_data, private_data_len);
2062 if (IS_ERR(data))
2063 return PTR_ERR(data);
2064
2065 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2066 spin_lock_irqsave(&cm_id_priv->lock, flags);
2067 if (cm_id->state != IB_CM_DREQ_RCVD) {
2068 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2069 kfree(data);
2070 return -EINVAL;
2071 }
2072
2073 cm_set_private_data(cm_id_priv, data, private_data_len);
2074 cm_enter_timewait(cm_id_priv);
2075
2076 ret = cm_alloc_msg(cm_id_priv, &msg);
2077 if (ret)
2078 goto out;
2079
2080 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2081 private_data, private_data_len);
2082
2083 ret = ib_post_send_mad(msg, NULL);
2084 if (ret) {
2085 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2086 cm_free_msg(msg);
2087 return ret;
2088 }
2089
2090 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2091 return ret;
2092 }
2093 EXPORT_SYMBOL(ib_send_cm_drep);
2094
2095 static int cm_issue_drep(struct cm_port *port,
2096 struct ib_mad_recv_wc *mad_recv_wc)
2097 {
2098 struct ib_mad_send_buf *msg = NULL;
2099 struct cm_dreq_msg *dreq_msg;
2100 struct cm_drep_msg *drep_msg;
2101 int ret;
2102
2103 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2104 if (ret)
2105 return ret;
2106
2107 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2108 drep_msg = (struct cm_drep_msg *) msg->mad;
2109
2110 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2111 drep_msg->remote_comm_id = dreq_msg->local_comm_id;
2112 drep_msg->local_comm_id = dreq_msg->remote_comm_id;
2113
2114 ret = ib_post_send_mad(msg, NULL);
2115 if (ret)
2116 cm_free_msg(msg);
2117
2118 return ret;
2119 }
2120
2121 static int cm_dreq_handler(struct cm_work *work)
2122 {
2123 struct cm_id_private *cm_id_priv;
2124 struct cm_dreq_msg *dreq_msg;
2125 struct ib_mad_send_buf *msg = NULL;
2126 int ret;
2127
2128 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2129 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
2130 dreq_msg->local_comm_id);
2131 if (!cm_id_priv) {
2132 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2133 counter[CM_DREQ_COUNTER]);
2134 cm_issue_drep(work->port, work->mad_recv_wc);
2135 return -EINVAL;
2136 }
2137
2138 work->cm_event.private_data = &dreq_msg->private_data;
2139
2140 spin_lock_irq(&cm_id_priv->lock);
2141 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
2142 goto unlock;
2143
2144 switch (cm_id_priv->id.state) {
2145 case IB_CM_REP_SENT:
2146 case IB_CM_DREQ_SENT:
2147 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2148 break;
2149 case IB_CM_ESTABLISHED:
2150 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2151 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2152 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2153 break;
2154 case IB_CM_MRA_REP_RCVD:
2155 break;
2156 case IB_CM_TIMEWAIT:
2157 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2158 counter[CM_DREQ_COUNTER]);
2159 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2160 goto unlock;
2161
2162 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2163 cm_id_priv->private_data,
2164 cm_id_priv->private_data_len);
2165 spin_unlock_irq(&cm_id_priv->lock);
2166
2167 if (ib_post_send_mad(msg, NULL))
2168 cm_free_msg(msg);
2169 goto deref;
2170 case IB_CM_DREQ_RCVD:
2171 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2172 counter[CM_DREQ_COUNTER]);
2173 goto unlock;
2174 default:
2175 goto unlock;
2176 }
2177 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2178 cm_id_priv->tid = dreq_msg->hdr.tid;
2179 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2180 if (!ret)
2181 list_add_tail(&work->list, &cm_id_priv->work_list);
2182 spin_unlock_irq(&cm_id_priv->lock);
2183
2184 if (ret)
2185 cm_process_work(cm_id_priv, work);
2186 else
2187 cm_deref_id(cm_id_priv);
2188 return 0;
2189
2190 unlock: spin_unlock_irq(&cm_id_priv->lock);
2191 deref: cm_deref_id(cm_id_priv);
2192 return -EINVAL;
2193 }
2194
2195 static int cm_drep_handler(struct cm_work *work)
2196 {
2197 struct cm_id_private *cm_id_priv;
2198 struct cm_drep_msg *drep_msg;
2199 int ret;
2200
2201 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2202 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2203 drep_msg->local_comm_id);
2204 if (!cm_id_priv)
2205 return -EINVAL;
2206
2207 work->cm_event.private_data = &drep_msg->private_data;
2208
2209 spin_lock_irq(&cm_id_priv->lock);
2210 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2211 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2212 spin_unlock_irq(&cm_id_priv->lock);
2213 goto out;
2214 }
2215 cm_enter_timewait(cm_id_priv);
2216
2217 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2218 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2219 if (!ret)
2220 list_add_tail(&work->list, &cm_id_priv->work_list);
2221 spin_unlock_irq(&cm_id_priv->lock);
2222
2223 if (ret)
2224 cm_process_work(cm_id_priv, work);
2225 else
2226 cm_deref_id(cm_id_priv);
2227 return 0;
2228 out:
2229 cm_deref_id(cm_id_priv);
2230 return -EINVAL;
2231 }
2232
2233 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2234 enum ib_cm_rej_reason reason,
2235 void *ari,
2236 u8 ari_length,
2237 const void *private_data,
2238 u8 private_data_len)
2239 {
2240 struct cm_id_private *cm_id_priv;
2241 struct ib_mad_send_buf *msg;
2242 unsigned long flags;
2243 int ret;
2244
2245 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2246 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2247 return -EINVAL;
2248
2249 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2250
2251 spin_lock_irqsave(&cm_id_priv->lock, flags);
2252 switch (cm_id->state) {
2253 case IB_CM_REQ_SENT:
2254 case IB_CM_MRA_REQ_RCVD:
2255 case IB_CM_REQ_RCVD:
2256 case IB_CM_MRA_REQ_SENT:
2257 case IB_CM_REP_RCVD:
2258 case IB_CM_MRA_REP_SENT:
2259 ret = cm_alloc_msg(cm_id_priv, &msg);
2260 if (!ret)
2261 cm_format_rej((struct cm_rej_msg *) msg->mad,
2262 cm_id_priv, reason, ari, ari_length,
2263 private_data, private_data_len);
2264
2265 cm_reset_to_idle(cm_id_priv);
2266 break;
2267 case IB_CM_REP_SENT:
2268 case IB_CM_MRA_REP_RCVD:
2269 ret = cm_alloc_msg(cm_id_priv, &msg);
2270 if (!ret)
2271 cm_format_rej((struct cm_rej_msg *) msg->mad,
2272 cm_id_priv, reason, ari, ari_length,
2273 private_data, private_data_len);
2274
2275 cm_enter_timewait(cm_id_priv);
2276 break;
2277 default:
2278 ret = -EINVAL;
2279 goto out;
2280 }
2281
2282 if (ret)
2283 goto out;
2284
2285 ret = ib_post_send_mad(msg, NULL);
2286 if (ret)
2287 cm_free_msg(msg);
2288
2289 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2290 return ret;
2291 }
2292 EXPORT_SYMBOL(ib_send_cm_rej);
2293
2294 static void cm_format_rej_event(struct cm_work *work)
2295 {
2296 struct cm_rej_msg *rej_msg;
2297 struct ib_cm_rej_event_param *param;
2298
2299 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2300 param = &work->cm_event.param.rej_rcvd;
2301 param->ari = rej_msg->ari;
2302 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2303 param->reason = __be16_to_cpu(rej_msg->reason);
2304 work->cm_event.private_data = &rej_msg->private_data;
2305 }
2306
2307 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2308 {
2309 struct cm_timewait_info *timewait_info;
2310 struct cm_id_private *cm_id_priv;
2311 __be32 remote_id;
2312
2313 remote_id = rej_msg->local_comm_id;
2314
2315 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2316 spin_lock_irq(&cm.lock);
2317 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2318 remote_id);
2319 if (!timewait_info) {
2320 spin_unlock_irq(&cm.lock);
2321 return NULL;
2322 }
2323 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2324 (timewait_info->work.local_id ^
2325 cm.random_id_operand));
2326 if (cm_id_priv) {
2327 if (cm_id_priv->id.remote_id == remote_id)
2328 atomic_inc(&cm_id_priv->refcount);
2329 else
2330 cm_id_priv = NULL;
2331 }
2332 spin_unlock_irq(&cm.lock);
2333 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2334 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2335 else
2336 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2337
2338 return cm_id_priv;
2339 }
2340
2341 static int cm_rej_handler(struct cm_work *work)
2342 {
2343 struct cm_id_private *cm_id_priv;
2344 struct cm_rej_msg *rej_msg;
2345 int ret;
2346
2347 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2348 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2349 if (!cm_id_priv)
2350 return -EINVAL;
2351
2352 cm_format_rej_event(work);
2353
2354 spin_lock_irq(&cm_id_priv->lock);
2355 switch (cm_id_priv->id.state) {
2356 case IB_CM_REQ_SENT:
2357 case IB_CM_MRA_REQ_RCVD:
2358 case IB_CM_REP_SENT:
2359 case IB_CM_MRA_REP_RCVD:
2360 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2361 /* fall through */
2362 case IB_CM_REQ_RCVD:
2363 case IB_CM_MRA_REQ_SENT:
2364 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2365 cm_enter_timewait(cm_id_priv);
2366 else
2367 cm_reset_to_idle(cm_id_priv);
2368 break;
2369 case IB_CM_DREQ_SENT:
2370 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2371 /* fall through */
2372 case IB_CM_REP_RCVD:
2373 case IB_CM_MRA_REP_SENT:
2374 cm_enter_timewait(cm_id_priv);
2375 break;
2376 case IB_CM_ESTABLISHED:
2377 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
2378 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
2379 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
2380 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2381 cm_id_priv->msg);
2382 cm_enter_timewait(cm_id_priv);
2383 break;
2384 }
2385 /* fall through */
2386 default:
2387 spin_unlock_irq(&cm_id_priv->lock);
2388 ret = -EINVAL;
2389 goto out;
2390 }
2391
2392 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2393 if (!ret)
2394 list_add_tail(&work->list, &cm_id_priv->work_list);
2395 spin_unlock_irq(&cm_id_priv->lock);
2396
2397 if (ret)
2398 cm_process_work(cm_id_priv, work);
2399 else
2400 cm_deref_id(cm_id_priv);
2401 return 0;
2402 out:
2403 cm_deref_id(cm_id_priv);
2404 return -EINVAL;
2405 }
2406
2407 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2408 u8 service_timeout,
2409 const void *private_data,
2410 u8 private_data_len)
2411 {
2412 struct cm_id_private *cm_id_priv;
2413 struct ib_mad_send_buf *msg;
2414 enum ib_cm_state cm_state;
2415 enum ib_cm_lap_state lap_state;
2416 enum cm_msg_response msg_response;
2417 void *data;
2418 unsigned long flags;
2419 int ret;
2420
2421 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2422 return -EINVAL;
2423
2424 data = cm_copy_private_data(private_data, private_data_len);
2425 if (IS_ERR(data))
2426 return PTR_ERR(data);
2427
2428 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2429
2430 spin_lock_irqsave(&cm_id_priv->lock, flags);
2431 switch(cm_id_priv->id.state) {
2432 case IB_CM_REQ_RCVD:
2433 cm_state = IB_CM_MRA_REQ_SENT;
2434 lap_state = cm_id->lap_state;
2435 msg_response = CM_MSG_RESPONSE_REQ;
2436 break;
2437 case IB_CM_REP_RCVD:
2438 cm_state = IB_CM_MRA_REP_SENT;
2439 lap_state = cm_id->lap_state;
2440 msg_response = CM_MSG_RESPONSE_REP;
2441 break;
2442 case IB_CM_ESTABLISHED:
2443 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
2444 cm_state = cm_id->state;
2445 lap_state = IB_CM_MRA_LAP_SENT;
2446 msg_response = CM_MSG_RESPONSE_OTHER;
2447 break;
2448 }
2449 default:
2450 ret = -EINVAL;
2451 goto error1;
2452 }
2453
2454 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
2455 ret = cm_alloc_msg(cm_id_priv, &msg);
2456 if (ret)
2457 goto error1;
2458
2459 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2460 msg_response, service_timeout,
2461 private_data, private_data_len);
2462 ret = ib_post_send_mad(msg, NULL);
2463 if (ret)
2464 goto error2;
2465 }
2466
2467 cm_id->state = cm_state;
2468 cm_id->lap_state = lap_state;
2469 cm_id_priv->service_timeout = service_timeout;
2470 cm_set_private_data(cm_id_priv, data, private_data_len);
2471 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2472 return 0;
2473
2474 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2475 kfree(data);
2476 return ret;
2477
2478 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2479 kfree(data);
2480 cm_free_msg(msg);
2481 return ret;
2482 }
2483 EXPORT_SYMBOL(ib_send_cm_mra);
2484
2485 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2486 {
2487 switch (cm_mra_get_msg_mraed(mra_msg)) {
2488 case CM_MSG_RESPONSE_REQ:
2489 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2490 case CM_MSG_RESPONSE_REP:
2491 case CM_MSG_RESPONSE_OTHER:
2492 return cm_acquire_id(mra_msg->remote_comm_id,
2493 mra_msg->local_comm_id);
2494 default:
2495 return NULL;
2496 }
2497 }
2498
2499 static int cm_mra_handler(struct cm_work *work)
2500 {
2501 struct cm_id_private *cm_id_priv;
2502 struct cm_mra_msg *mra_msg;
2503 int timeout, ret;
2504
2505 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2506 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2507 if (!cm_id_priv)
2508 return -EINVAL;
2509
2510 work->cm_event.private_data = &mra_msg->private_data;
2511 work->cm_event.param.mra_rcvd.service_timeout =
2512 cm_mra_get_service_timeout(mra_msg);
2513 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2514 cm_convert_to_ms(cm_id_priv->av.timeout);
2515
2516 spin_lock_irq(&cm_id_priv->lock);
2517 switch (cm_id_priv->id.state) {
2518 case IB_CM_REQ_SENT:
2519 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2520 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2521 cm_id_priv->msg, timeout))
2522 goto out;
2523 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2524 break;
2525 case IB_CM_REP_SENT:
2526 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2527 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2528 cm_id_priv->msg, timeout))
2529 goto out;
2530 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2531 break;
2532 case IB_CM_ESTABLISHED:
2533 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2534 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2535 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2536 cm_id_priv->msg, timeout)) {
2537 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2538 atomic_long_inc(&work->port->
2539 counter_group[CM_RECV_DUPLICATES].
2540 counter[CM_MRA_COUNTER]);
2541 goto out;
2542 }
2543 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2544 break;
2545 case IB_CM_MRA_REQ_RCVD:
2546 case IB_CM_MRA_REP_RCVD:
2547 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2548 counter[CM_MRA_COUNTER]);
2549 /* fall through */
2550 default:
2551 goto out;
2552 }
2553
2554 cm_id_priv->msg->context[1] = (void *) (unsigned long)
2555 cm_id_priv->id.state;
2556 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2557 if (!ret)
2558 list_add_tail(&work->list, &cm_id_priv->work_list);
2559 spin_unlock_irq(&cm_id_priv->lock);
2560
2561 if (ret)
2562 cm_process_work(cm_id_priv, work);
2563 else
2564 cm_deref_id(cm_id_priv);
2565 return 0;
2566 out:
2567 spin_unlock_irq(&cm_id_priv->lock);
2568 cm_deref_id(cm_id_priv);
2569 return -EINVAL;
2570 }
2571
2572 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2573 struct cm_id_private *cm_id_priv,
2574 struct ib_sa_path_rec *alternate_path,
2575 const void *private_data,
2576 u8 private_data_len)
2577 {
2578 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2579 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2580 lap_msg->local_comm_id = cm_id_priv->id.local_id;
2581 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2582 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2583 /* todo: need remote CM response timeout */
2584 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2585 lap_msg->alt_local_lid = alternate_path->slid;
2586 lap_msg->alt_remote_lid = alternate_path->dlid;
2587 lap_msg->alt_local_gid = alternate_path->sgid;
2588 lap_msg->alt_remote_gid = alternate_path->dgid;
2589 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2590 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2591 lap_msg->alt_hop_limit = alternate_path->hop_limit;
2592 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2593 cm_lap_set_sl(lap_msg, alternate_path->sl);
2594 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2595 cm_lap_set_local_ack_timeout(lap_msg,
2596 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
2597 alternate_path->packet_life_time));
2598
2599 if (private_data && private_data_len)
2600 memcpy(lap_msg->private_data, private_data, private_data_len);
2601 }
2602
2603 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2604 struct ib_sa_path_rec *alternate_path,
2605 const void *private_data,
2606 u8 private_data_len)
2607 {
2608 struct cm_id_private *cm_id_priv;
2609 struct ib_mad_send_buf *msg;
2610 unsigned long flags;
2611 int ret;
2612
2613 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2614 return -EINVAL;
2615
2616 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2617 spin_lock_irqsave(&cm_id_priv->lock, flags);
2618 if (cm_id->state != IB_CM_ESTABLISHED ||
2619 (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2620 cm_id->lap_state != IB_CM_LAP_IDLE)) {
2621 ret = -EINVAL;
2622 goto out;
2623 }
2624
2625 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
2626 if (ret)
2627 goto out;
2628 cm_id_priv->alt_av.timeout =
2629 cm_ack_timeout(cm_id_priv->target_ack_delay,
2630 cm_id_priv->alt_av.timeout - 1);
2631
2632 ret = cm_alloc_msg(cm_id_priv, &msg);
2633 if (ret)
2634 goto out;
2635
2636 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2637 alternate_path, private_data, private_data_len);
2638 msg->timeout_ms = cm_id_priv->timeout_ms;
2639 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2640
2641 ret = ib_post_send_mad(msg, NULL);
2642 if (ret) {
2643 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2644 cm_free_msg(msg);
2645 return ret;
2646 }
2647
2648 cm_id->lap_state = IB_CM_LAP_SENT;
2649 cm_id_priv->msg = msg;
2650
2651 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2652 return ret;
2653 }
2654 EXPORT_SYMBOL(ib_send_cm_lap);
2655
2656 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2657 struct ib_sa_path_rec *path,
2658 struct cm_lap_msg *lap_msg)
2659 {
2660 memset(path, 0, sizeof *path);
2661 path->dgid = lap_msg->alt_local_gid;
2662 path->sgid = lap_msg->alt_remote_gid;
2663 path->dlid = lap_msg->alt_local_lid;
2664 path->slid = lap_msg->alt_remote_lid;
2665 path->flow_label = cm_lap_get_flow_label(lap_msg);
2666 path->hop_limit = lap_msg->alt_hop_limit;
2667 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2668 path->reversible = 1;
2669 path->pkey = cm_id_priv->pkey;
2670 path->sl = cm_lap_get_sl(lap_msg);
2671 path->mtu_selector = IB_SA_EQ;
2672 path->mtu = cm_id_priv->path_mtu;
2673 path->rate_selector = IB_SA_EQ;
2674 path->rate = cm_lap_get_packet_rate(lap_msg);
2675 path->packet_life_time_selector = IB_SA_EQ;
2676 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2677 path->packet_life_time -= (path->packet_life_time > 0);
2678 }
2679
2680 static int cm_lap_handler(struct cm_work *work)
2681 {
2682 struct cm_id_private *cm_id_priv;
2683 struct cm_lap_msg *lap_msg;
2684 struct ib_cm_lap_event_param *param;
2685 struct ib_mad_send_buf *msg = NULL;
2686 int ret;
2687
2688 /* todo: verify LAP request and send reject APR if invalid. */
2689 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2690 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2691 lap_msg->local_comm_id);
2692 if (!cm_id_priv)
2693 return -EINVAL;
2694
2695 param = &work->cm_event.param.lap_rcvd;
2696 param->alternate_path = &work->path[0];
2697 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
2698 work->cm_event.private_data = &lap_msg->private_data;
2699
2700 spin_lock_irq(&cm_id_priv->lock);
2701 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2702 goto unlock;
2703
2704 switch (cm_id_priv->id.lap_state) {
2705 case IB_CM_LAP_UNINIT:
2706 case IB_CM_LAP_IDLE:
2707 break;
2708 case IB_CM_MRA_LAP_SENT:
2709 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2710 counter[CM_LAP_COUNTER]);
2711 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2712 goto unlock;
2713
2714 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2715 CM_MSG_RESPONSE_OTHER,
2716 cm_id_priv->service_timeout,
2717 cm_id_priv->private_data,
2718 cm_id_priv->private_data_len);
2719 spin_unlock_irq(&cm_id_priv->lock);
2720
2721 if (ib_post_send_mad(msg, NULL))
2722 cm_free_msg(msg);
2723 goto deref;
2724 case IB_CM_LAP_RCVD:
2725 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2726 counter[CM_LAP_COUNTER]);
2727 goto unlock;
2728 default:
2729 goto unlock;
2730 }
2731
2732 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2733 cm_id_priv->tid = lap_msg->hdr.tid;
2734 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2735 work->mad_recv_wc->recv_buf.grh,
2736 &cm_id_priv->av);
2737 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
2738 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2739 if (!ret)
2740 list_add_tail(&work->list, &cm_id_priv->work_list);
2741 spin_unlock_irq(&cm_id_priv->lock);
2742
2743 if (ret)
2744 cm_process_work(cm_id_priv, work);
2745 else
2746 cm_deref_id(cm_id_priv);
2747 return 0;
2748
2749 unlock: spin_unlock_irq(&cm_id_priv->lock);
2750 deref: cm_deref_id(cm_id_priv);
2751 return -EINVAL;
2752 }
2753
2754 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2755 struct cm_id_private *cm_id_priv,
2756 enum ib_cm_apr_status status,
2757 void *info,
2758 u8 info_length,
2759 const void *private_data,
2760 u8 private_data_len)
2761 {
2762 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2763 apr_msg->local_comm_id = cm_id_priv->id.local_id;
2764 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2765 apr_msg->ap_status = (u8) status;
2766
2767 if (info && info_length) {
2768 apr_msg->info_length = info_length;
2769 memcpy(apr_msg->info, info, info_length);
2770 }
2771
2772 if (private_data && private_data_len)
2773 memcpy(apr_msg->private_data, private_data, private_data_len);
2774 }
2775
2776 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2777 enum ib_cm_apr_status status,
2778 void *info,
2779 u8 info_length,
2780 const void *private_data,
2781 u8 private_data_len)
2782 {
2783 struct cm_id_private *cm_id_priv;
2784 struct ib_mad_send_buf *msg;
2785 unsigned long flags;
2786 int ret;
2787
2788 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2789 (info && info_length > IB_CM_APR_INFO_LENGTH))
2790 return -EINVAL;
2791
2792 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2793 spin_lock_irqsave(&cm_id_priv->lock, flags);
2794 if (cm_id->state != IB_CM_ESTABLISHED ||
2795 (cm_id->lap_state != IB_CM_LAP_RCVD &&
2796 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2797 ret = -EINVAL;
2798 goto out;
2799 }
2800
2801 ret = cm_alloc_msg(cm_id_priv, &msg);
2802 if (ret)
2803 goto out;
2804
2805 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2806 info, info_length, private_data, private_data_len);
2807 ret = ib_post_send_mad(msg, NULL);
2808 if (ret) {
2809 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2810 cm_free_msg(msg);
2811 return ret;
2812 }
2813
2814 cm_id->lap_state = IB_CM_LAP_IDLE;
2815 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2816 return ret;
2817 }
2818 EXPORT_SYMBOL(ib_send_cm_apr);
2819
2820 static int cm_apr_handler(struct cm_work *work)
2821 {
2822 struct cm_id_private *cm_id_priv;
2823 struct cm_apr_msg *apr_msg;
2824 int ret;
2825
2826 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2827 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2828 apr_msg->local_comm_id);
2829 if (!cm_id_priv)
2830 return -EINVAL; /* Unmatched reply. */
2831
2832 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2833 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2834 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2835 work->cm_event.private_data = &apr_msg->private_data;
2836
2837 spin_lock_irq(&cm_id_priv->lock);
2838 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2839 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2840 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2841 spin_unlock_irq(&cm_id_priv->lock);
2842 goto out;
2843 }
2844 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2845 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2846 cm_id_priv->msg = NULL;
2847
2848 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2849 if (!ret)
2850 list_add_tail(&work->list, &cm_id_priv->work_list);
2851 spin_unlock_irq(&cm_id_priv->lock);
2852
2853 if (ret)
2854 cm_process_work(cm_id_priv, work);
2855 else
2856 cm_deref_id(cm_id_priv);
2857 return 0;
2858 out:
2859 cm_deref_id(cm_id_priv);
2860 return -EINVAL;
2861 }
2862
2863 static int cm_timewait_handler(struct cm_work *work)
2864 {
2865 struct cm_timewait_info *timewait_info;
2866 struct cm_id_private *cm_id_priv;
2867 int ret;
2868
2869 timewait_info = (struct cm_timewait_info *)work;
2870 spin_lock_irq(&cm.lock);
2871 list_del(&timewait_info->list);
2872 spin_unlock_irq(&cm.lock);
2873
2874 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2875 timewait_info->work.remote_id);
2876 if (!cm_id_priv)
2877 return -EINVAL;
2878
2879 spin_lock_irq(&cm_id_priv->lock);
2880 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2881 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2882 spin_unlock_irq(&cm_id_priv->lock);
2883 goto out;
2884 }
2885 cm_id_priv->id.state = IB_CM_IDLE;
2886 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2887 if (!ret)
2888 list_add_tail(&work->list, &cm_id_priv->work_list);
2889 spin_unlock_irq(&cm_id_priv->lock);
2890
2891 if (ret)
2892 cm_process_work(cm_id_priv, work);
2893 else
2894 cm_deref_id(cm_id_priv);
2895 return 0;
2896 out:
2897 cm_deref_id(cm_id_priv);
2898 return -EINVAL;
2899 }
2900
2901 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2902 struct cm_id_private *cm_id_priv,
2903 struct ib_cm_sidr_req_param *param)
2904 {
2905 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2906 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2907 sidr_req_msg->request_id = cm_id_priv->id.local_id;
2908 sidr_req_msg->pkey = param->path->pkey;
2909 sidr_req_msg->service_id = param->service_id;
2910
2911 if (param->private_data && param->private_data_len)
2912 memcpy(sidr_req_msg->private_data, param->private_data,
2913 param->private_data_len);
2914 }
2915
2916 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2917 struct ib_cm_sidr_req_param *param)
2918 {
2919 struct cm_id_private *cm_id_priv;
2920 struct ib_mad_send_buf *msg;
2921 unsigned long flags;
2922 int ret;
2923
2924 if (!param->path || (param->private_data &&
2925 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2926 return -EINVAL;
2927
2928 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2929 ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2930 if (ret)
2931 goto out;
2932
2933 cm_id->service_id = param->service_id;
2934 cm_id->service_mask = ~cpu_to_be64(0);
2935 cm_id_priv->timeout_ms = param->timeout_ms;
2936 cm_id_priv->max_cm_retries = param->max_cm_retries;
2937 ret = cm_alloc_msg(cm_id_priv, &msg);
2938 if (ret)
2939 goto out;
2940
2941 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2942 param);
2943 msg->timeout_ms = cm_id_priv->timeout_ms;
2944 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2945
2946 spin_lock_irqsave(&cm_id_priv->lock, flags);
2947 if (cm_id->state == IB_CM_IDLE)
2948 ret = ib_post_send_mad(msg, NULL);
2949 else
2950 ret = -EINVAL;
2951
2952 if (ret) {
2953 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2954 cm_free_msg(msg);
2955 goto out;
2956 }
2957 cm_id->state = IB_CM_SIDR_REQ_SENT;
2958 cm_id_priv->msg = msg;
2959 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2960 out:
2961 return ret;
2962 }
2963 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2964
2965 static void cm_format_sidr_req_event(struct cm_work *work,
2966 struct ib_cm_id *listen_id)
2967 {
2968 struct cm_sidr_req_msg *sidr_req_msg;
2969 struct ib_cm_sidr_req_event_param *param;
2970
2971 sidr_req_msg = (struct cm_sidr_req_msg *)
2972 work->mad_recv_wc->recv_buf.mad;
2973 param = &work->cm_event.param.sidr_req_rcvd;
2974 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2975 param->listen_id = listen_id;
2976 param->port = work->port->port_num;
2977 work->cm_event.private_data = &sidr_req_msg->private_data;
2978 }
2979
2980 static int cm_sidr_req_handler(struct cm_work *work)
2981 {
2982 struct ib_cm_id *cm_id;
2983 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2984 struct cm_sidr_req_msg *sidr_req_msg;
2985 struct ib_wc *wc;
2986
2987 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
2988 if (IS_ERR(cm_id))
2989 return PTR_ERR(cm_id);
2990 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2991
2992 /* Record SGID/SLID and request ID for lookup. */
2993 sidr_req_msg = (struct cm_sidr_req_msg *)
2994 work->mad_recv_wc->recv_buf.mad;
2995 wc = work->mad_recv_wc->wc;
2996 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2997 cm_id_priv->av.dgid.global.interface_id = 0;
2998 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2999 work->mad_recv_wc->recv_buf.grh,
3000 &cm_id_priv->av);
3001 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
3002 cm_id_priv->tid = sidr_req_msg->hdr.tid;
3003 atomic_inc(&cm_id_priv->work_count);
3004
3005 spin_lock_irq(&cm.lock);
3006 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3007 if (cur_cm_id_priv) {
3008 spin_unlock_irq(&cm.lock);
3009 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3010 counter[CM_SIDR_REQ_COUNTER]);
3011 goto out; /* Duplicate message. */
3012 }
3013 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3014 cur_cm_id_priv = cm_find_listen(cm_id->device,
3015 sidr_req_msg->service_id,
3016 sidr_req_msg->private_data);
3017 if (!cur_cm_id_priv) {
3018 spin_unlock_irq(&cm.lock);
3019 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED);
3020 goto out; /* No match. */
3021 }
3022 atomic_inc(&cur_cm_id_priv->refcount);
3023 atomic_inc(&cm_id_priv->refcount);
3024 spin_unlock_irq(&cm.lock);
3025
3026 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
3027 cm_id_priv->id.context = cur_cm_id_priv->id.context;
3028 cm_id_priv->id.service_id = sidr_req_msg->service_id;
3029 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3030
3031 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
3032 cm_process_work(cm_id_priv, work);
3033 cm_deref_id(cur_cm_id_priv);
3034 return 0;
3035 out:
3036 ib_destroy_cm_id(&cm_id_priv->id);
3037 return -EINVAL;
3038 }
3039
3040 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3041 struct cm_id_private *cm_id_priv,
3042 struct ib_cm_sidr_rep_param *param)
3043 {
3044 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3045 cm_id_priv->tid);
3046 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
3047 sidr_rep_msg->status = param->status;
3048 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
3049 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
3050 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
3051
3052 if (param->info && param->info_length)
3053 memcpy(sidr_rep_msg->info, param->info, param->info_length);
3054
3055 if (param->private_data && param->private_data_len)
3056 memcpy(sidr_rep_msg->private_data, param->private_data,
3057 param->private_data_len);
3058 }
3059
3060 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3061 struct ib_cm_sidr_rep_param *param)
3062 {
3063 struct cm_id_private *cm_id_priv;
3064 struct ib_mad_send_buf *msg;
3065 unsigned long flags;
3066 int ret;
3067
3068 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3069 (param->private_data &&
3070 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3071 return -EINVAL;
3072
3073 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3074 spin_lock_irqsave(&cm_id_priv->lock, flags);
3075 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
3076 ret = -EINVAL;
3077 goto error;
3078 }
3079
3080 ret = cm_alloc_msg(cm_id_priv, &msg);
3081 if (ret)
3082 goto error;
3083
3084 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3085 param);
3086 ret = ib_post_send_mad(msg, NULL);
3087 if (ret) {
3088 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3089 cm_free_msg(msg);
3090 return ret;
3091 }
3092 cm_id->state = IB_CM_IDLE;
3093 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3094
3095 spin_lock_irqsave(&cm.lock, flags);
3096 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3097 spin_unlock_irqrestore(&cm.lock, flags);
3098 return 0;
3099
3100 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3101 return ret;
3102 }
3103 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3104
3105 static void cm_format_sidr_rep_event(struct cm_work *work)
3106 {
3107 struct cm_sidr_rep_msg *sidr_rep_msg;
3108 struct ib_cm_sidr_rep_event_param *param;
3109
3110 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3111 work->mad_recv_wc->recv_buf.mad;
3112 param = &work->cm_event.param.sidr_rep_rcvd;
3113 param->status = sidr_rep_msg->status;
3114 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
3115 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
3116 param->info = &sidr_rep_msg->info;
3117 param->info_len = sidr_rep_msg->info_length;
3118 work->cm_event.private_data = &sidr_rep_msg->private_data;
3119 }
3120
3121 static int cm_sidr_rep_handler(struct cm_work *work)
3122 {
3123 struct cm_sidr_rep_msg *sidr_rep_msg;
3124 struct cm_id_private *cm_id_priv;
3125
3126 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3127 work->mad_recv_wc->recv_buf.mad;
3128 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
3129 if (!cm_id_priv)
3130 return -EINVAL; /* Unmatched reply. */
3131
3132 spin_lock_irq(&cm_id_priv->lock);
3133 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3134 spin_unlock_irq(&cm_id_priv->lock);
3135 goto out;
3136 }
3137 cm_id_priv->id.state = IB_CM_IDLE;
3138 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3139 spin_unlock_irq(&cm_id_priv->lock);
3140
3141 cm_format_sidr_rep_event(work);
3142 cm_process_work(cm_id_priv, work);
3143 return 0;
3144 out:
3145 cm_deref_id(cm_id_priv);
3146 return -EINVAL;
3147 }
3148
3149 static void cm_process_send_error(struct ib_mad_send_buf *msg,
3150 enum ib_wc_status wc_status)
3151 {
3152 struct cm_id_private *cm_id_priv;
3153 struct ib_cm_event cm_event;
3154 enum ib_cm_state state;
3155 int ret;
3156
3157 memset(&cm_event, 0, sizeof cm_event);
3158 cm_id_priv = msg->context[0];
3159
3160 /* Discard old sends or ones without a response. */
3161 spin_lock_irq(&cm_id_priv->lock);
3162 state = (enum ib_cm_state) (unsigned long) msg->context[1];
3163 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3164 goto discard;
3165
3166 switch (state) {
3167 case IB_CM_REQ_SENT:
3168 case IB_CM_MRA_REQ_RCVD:
3169 cm_reset_to_idle(cm_id_priv);
3170 cm_event.event = IB_CM_REQ_ERROR;
3171 break;
3172 case IB_CM_REP_SENT:
3173 case IB_CM_MRA_REP_RCVD:
3174 cm_reset_to_idle(cm_id_priv);
3175 cm_event.event = IB_CM_REP_ERROR;
3176 break;
3177 case IB_CM_DREQ_SENT:
3178 cm_enter_timewait(cm_id_priv);
3179 cm_event.event = IB_CM_DREQ_ERROR;
3180 break;
3181 case IB_CM_SIDR_REQ_SENT:
3182 cm_id_priv->id.state = IB_CM_IDLE;
3183 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3184 break;
3185 default:
3186 goto discard;
3187 }
3188 spin_unlock_irq(&cm_id_priv->lock);
3189 cm_event.param.send_status = wc_status;
3190
3191 /* No other events can occur on the cm_id at this point. */
3192 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3193 cm_free_msg(msg);
3194 if (ret)
3195 ib_destroy_cm_id(&cm_id_priv->id);
3196 return;
3197 discard:
3198 spin_unlock_irq(&cm_id_priv->lock);
3199 cm_free_msg(msg);
3200 }
3201
3202 static void cm_send_handler(struct ib_mad_agent *mad_agent,
3203 struct ib_mad_send_wc *mad_send_wc)
3204 {
3205 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3206 struct cm_port *port;
3207 u16 attr_index;
3208
3209 port = mad_agent->context;
3210 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3211 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3212
3213 /*
3214 * If the send was in response to a received message (context[0] is not
3215 * set to a cm_id), and is not a REJ, then it is a send that was
3216 * manually retried.
3217 */
3218 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3219 msg->retries = 1;
3220
3221 atomic_long_add(1 + msg->retries,
3222 &port->counter_group[CM_XMIT].counter[attr_index]);
3223 if (msg->retries)
3224 atomic_long_add(msg->retries,
3225 &port->counter_group[CM_XMIT_RETRIES].
3226 counter[attr_index]);
3227
3228 switch (mad_send_wc->status) {
3229 case IB_WC_SUCCESS:
3230 case IB_WC_WR_FLUSH_ERR:
3231 cm_free_msg(msg);
3232 break;
3233 default:
3234 if (msg->context[0] && msg->context[1])
3235 cm_process_send_error(msg, mad_send_wc->status);
3236 else
3237 cm_free_msg(msg);
3238 break;
3239 }
3240 }
3241
3242 static void cm_work_handler(struct work_struct *_work)
3243 {
3244 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3245 int ret;
3246
3247 switch (work->cm_event.event) {
3248 case IB_CM_REQ_RECEIVED:
3249 ret = cm_req_handler(work);
3250 break;
3251 case IB_CM_MRA_RECEIVED:
3252 ret = cm_mra_handler(work);
3253 break;
3254 case IB_CM_REJ_RECEIVED:
3255 ret = cm_rej_handler(work);
3256 break;
3257 case IB_CM_REP_RECEIVED:
3258 ret = cm_rep_handler(work);
3259 break;
3260 case IB_CM_RTU_RECEIVED:
3261 ret = cm_rtu_handler(work);
3262 break;
3263 case IB_CM_USER_ESTABLISHED:
3264 ret = cm_establish_handler(work);
3265 break;
3266 case IB_CM_DREQ_RECEIVED:
3267 ret = cm_dreq_handler(work);
3268 break;
3269 case IB_CM_DREP_RECEIVED:
3270 ret = cm_drep_handler(work);
3271 break;
3272 case IB_CM_SIDR_REQ_RECEIVED:
3273 ret = cm_sidr_req_handler(work);
3274 break;
3275 case IB_CM_SIDR_REP_RECEIVED:
3276 ret = cm_sidr_rep_handler(work);
3277 break;
3278 case IB_CM_LAP_RECEIVED:
3279 ret = cm_lap_handler(work);
3280 break;
3281 case IB_CM_APR_RECEIVED:
3282 ret = cm_apr_handler(work);
3283 break;
3284 case IB_CM_TIMEWAIT_EXIT:
3285 ret = cm_timewait_handler(work);
3286 break;
3287 default:
3288 ret = -EINVAL;
3289 break;
3290 }
3291 if (ret)
3292 cm_free_work(work);
3293 }
3294
3295 static int cm_establish(struct ib_cm_id *cm_id)
3296 {
3297 struct cm_id_private *cm_id_priv;
3298 struct cm_work *work;
3299 unsigned long flags;
3300 int ret = 0;
3301
3302 work = kmalloc(sizeof *work, GFP_ATOMIC);
3303 if (!work)
3304 return -ENOMEM;
3305
3306 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3307 spin_lock_irqsave(&cm_id_priv->lock, flags);
3308 switch (cm_id->state)
3309 {
3310 case IB_CM_REP_SENT:
3311 case IB_CM_MRA_REP_RCVD:
3312 cm_id->state = IB_CM_ESTABLISHED;
3313 break;
3314 case IB_CM_ESTABLISHED:
3315 ret = -EISCONN;
3316 break;
3317 default:
3318 ret = -EINVAL;
3319 break;
3320 }
3321 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3322
3323 if (ret) {
3324 kfree(work);
3325 goto out;
3326 }
3327
3328 /*
3329 * The CM worker thread may try to destroy the cm_id before it
3330 * can execute this work item. To prevent potential deadlock,
3331 * we need to find the cm_id once we're in the context of the
3332 * worker thread, rather than holding a reference on it.
3333 */
3334 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3335 work->local_id = cm_id->local_id;
3336 work->remote_id = cm_id->remote_id;
3337 work->mad_recv_wc = NULL;
3338 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3339 queue_delayed_work(cm.wq, &work->work, 0);
3340 out:
3341 return ret;
3342 }
3343
3344 static int cm_migrate(struct ib_cm_id *cm_id)
3345 {
3346 struct cm_id_private *cm_id_priv;
3347 unsigned long flags;
3348 int ret = 0;
3349
3350 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3351 spin_lock_irqsave(&cm_id_priv->lock, flags);
3352 if (cm_id->state == IB_CM_ESTABLISHED &&
3353 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3354 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3355 cm_id->lap_state = IB_CM_LAP_IDLE;
3356 cm_id_priv->av = cm_id_priv->alt_av;
3357 } else
3358 ret = -EINVAL;
3359 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3360
3361 return ret;
3362 }
3363
3364 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3365 {
3366 int ret;
3367
3368 switch (event) {
3369 case IB_EVENT_COMM_EST:
3370 ret = cm_establish(cm_id);
3371 break;
3372 case IB_EVENT_PATH_MIG:
3373 ret = cm_migrate(cm_id);
3374 break;
3375 default:
3376 ret = -EINVAL;
3377 }
3378 return ret;
3379 }
3380 EXPORT_SYMBOL(ib_cm_notify);
3381
3382 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3383 struct ib_mad_recv_wc *mad_recv_wc)
3384 {
3385 struct cm_port *port = mad_agent->context;
3386 struct cm_work *work;
3387 enum ib_cm_event_type event;
3388 u16 attr_id;
3389 int paths = 0;
3390
3391 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3392 case CM_REQ_ATTR_ID:
3393 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3394 alt_local_lid != 0);
3395 event = IB_CM_REQ_RECEIVED;
3396 break;
3397 case CM_MRA_ATTR_ID:
3398 event = IB_CM_MRA_RECEIVED;
3399 break;
3400 case CM_REJ_ATTR_ID:
3401 event = IB_CM_REJ_RECEIVED;
3402 break;
3403 case CM_REP_ATTR_ID:
3404 event = IB_CM_REP_RECEIVED;
3405 break;
3406 case CM_RTU_ATTR_ID:
3407 event = IB_CM_RTU_RECEIVED;
3408 break;
3409 case CM_DREQ_ATTR_ID:
3410 event = IB_CM_DREQ_RECEIVED;
3411 break;
3412 case CM_DREP_ATTR_ID:
3413 event = IB_CM_DREP_RECEIVED;
3414 break;
3415 case CM_SIDR_REQ_ATTR_ID:
3416 event = IB_CM_SIDR_REQ_RECEIVED;
3417 break;
3418 case CM_SIDR_REP_ATTR_ID:
3419 event = IB_CM_SIDR_REP_RECEIVED;
3420 break;
3421 case CM_LAP_ATTR_ID:
3422 paths = 1;
3423 event = IB_CM_LAP_RECEIVED;
3424 break;
3425 case CM_APR_ATTR_ID:
3426 event = IB_CM_APR_RECEIVED;
3427 break;
3428 default:
3429 ib_free_recv_mad(mad_recv_wc);
3430 return;
3431 }
3432
3433 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
3434 atomic_long_inc(&port->counter_group[CM_RECV].
3435 counter[attr_id - CM_ATTR_ID_OFFSET]);
3436
3437 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3438 GFP_KERNEL);
3439 if (!work) {
3440 ib_free_recv_mad(mad_recv_wc);
3441 return;
3442 }
3443
3444 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3445 work->cm_event.event = event;
3446 work->mad_recv_wc = mad_recv_wc;
3447 work->port = port;
3448 queue_delayed_work(cm.wq, &work->work, 0);
3449 }
3450
3451 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3452 struct ib_qp_attr *qp_attr,
3453 int *qp_attr_mask)
3454 {
3455 unsigned long flags;
3456 int ret;
3457
3458 spin_lock_irqsave(&cm_id_priv->lock, flags);
3459 switch (cm_id_priv->id.state) {
3460 case IB_CM_REQ_SENT:
3461 case IB_CM_MRA_REQ_RCVD:
3462 case IB_CM_REQ_RCVD:
3463 case IB_CM_MRA_REQ_SENT:
3464 case IB_CM_REP_RCVD:
3465 case IB_CM_MRA_REP_SENT:
3466 case IB_CM_REP_SENT:
3467 case IB_CM_MRA_REP_RCVD:
3468 case IB_CM_ESTABLISHED:
3469 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3470 IB_QP_PKEY_INDEX | IB_QP_PORT;
3471 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
3472 if (cm_id_priv->responder_resources)
3473 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3474 IB_ACCESS_REMOTE_ATOMIC;
3475 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3476 qp_attr->port_num = cm_id_priv->av.port->port_num;
3477 ret = 0;
3478 break;
3479 default:
3480 ret = -EINVAL;
3481 break;
3482 }
3483 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3484 return ret;
3485 }
3486
3487 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3488 struct ib_qp_attr *qp_attr,
3489 int *qp_attr_mask)
3490 {
3491 unsigned long flags;
3492 int ret;
3493
3494 spin_lock_irqsave(&cm_id_priv->lock, flags);
3495 switch (cm_id_priv->id.state) {
3496 case IB_CM_REQ_RCVD:
3497 case IB_CM_MRA_REQ_SENT:
3498 case IB_CM_REP_RCVD:
3499 case IB_CM_MRA_REP_SENT:
3500 case IB_CM_REP_SENT:
3501 case IB_CM_MRA_REP_RCVD:
3502 case IB_CM_ESTABLISHED:
3503 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3504 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3505 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3506 qp_attr->path_mtu = cm_id_priv->path_mtu;
3507 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3508 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3509 if (cm_id_priv->qp_type == IB_QPT_RC ||
3510 cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
3511 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3512 IB_QP_MIN_RNR_TIMER;
3513 qp_attr->max_dest_rd_atomic =
3514 cm_id_priv->responder_resources;
3515 qp_attr->min_rnr_timer = 0;
3516 }
3517 if (cm_id_priv->alt_av.ah_attr.dlid) {
3518 *qp_attr_mask |= IB_QP_ALT_PATH;
3519 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3520 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3521 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3522 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3523 }
3524 ret = 0;
3525 break;
3526 default:
3527 ret = -EINVAL;
3528 break;
3529 }
3530 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3531 return ret;
3532 }
3533
3534 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3535 struct ib_qp_attr *qp_attr,
3536 int *qp_attr_mask)
3537 {
3538 unsigned long flags;
3539 int ret;
3540
3541 spin_lock_irqsave(&cm_id_priv->lock, flags);
3542 switch (cm_id_priv->id.state) {
3543 /* Allow transition to RTS before sending REP */
3544 case IB_CM_REQ_RCVD:
3545 case IB_CM_MRA_REQ_SENT:
3546
3547 case IB_CM_REP_RCVD:
3548 case IB_CM_MRA_REP_SENT:
3549 case IB_CM_REP_SENT:
3550 case IB_CM_MRA_REP_RCVD:
3551 case IB_CM_ESTABLISHED:
3552 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
3553 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3554 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3555 switch (cm_id_priv->qp_type) {
3556 case IB_QPT_RC:
3557 case IB_QPT_XRC_INI:
3558 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
3559 IB_QP_MAX_QP_RD_ATOMIC;
3560 qp_attr->retry_cnt = cm_id_priv->retry_count;
3561 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3562 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3563 /* fall through */
3564 case IB_QPT_XRC_TGT:
3565 *qp_attr_mask |= IB_QP_TIMEOUT;
3566 qp_attr->timeout = cm_id_priv->av.timeout;
3567 break;
3568 default:
3569 break;
3570 }
3571 if (cm_id_priv->alt_av.ah_attr.dlid) {
3572 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3573 qp_attr->path_mig_state = IB_MIG_REARM;
3574 }
3575 } else {
3576 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
3577 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3578 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3579 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3580 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3581 qp_attr->path_mig_state = IB_MIG_REARM;
3582 }
3583 ret = 0;
3584 break;
3585 default:
3586 ret = -EINVAL;
3587 break;
3588 }
3589 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3590 return ret;
3591 }
3592
3593 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3594 struct ib_qp_attr *qp_attr,
3595 int *qp_attr_mask)
3596 {
3597 struct cm_id_private *cm_id_priv;
3598 int ret;
3599
3600 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3601 switch (qp_attr->qp_state) {
3602 case IB_QPS_INIT:
3603 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3604 break;
3605 case IB_QPS_RTR:
3606 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3607 break;
3608 case IB_QPS_RTS:
3609 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3610 break;
3611 default:
3612 ret = -EINVAL;
3613 break;
3614 }
3615 return ret;
3616 }
3617 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3618
3619 static void cm_get_ack_delay(struct cm_device *cm_dev)
3620 {
3621 struct ib_device_attr attr;
3622
3623 if (ib_query_device(cm_dev->ib_device, &attr))
3624 cm_dev->ack_delay = 0; /* acks will rely on packet life time */
3625 else
3626 cm_dev->ack_delay = attr.local_ca_ack_delay;
3627 }
3628
3629 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
3630 char *buf)
3631 {
3632 struct cm_counter_group *group;
3633 struct cm_counter_attribute *cm_attr;
3634
3635 group = container_of(obj, struct cm_counter_group, obj);
3636 cm_attr = container_of(attr, struct cm_counter_attribute, attr);
3637
3638 return sprintf(buf, "%ld\n",
3639 atomic_long_read(&group->counter[cm_attr->index]));
3640 }
3641
3642 static const struct sysfs_ops cm_counter_ops = {
3643 .show = cm_show_counter
3644 };
3645
3646 static struct kobj_type cm_counter_obj_type = {
3647 .sysfs_ops = &cm_counter_ops,
3648 .default_attrs = cm_counter_default_attrs
3649 };
3650
3651 static void cm_release_port_obj(struct kobject *obj)
3652 {
3653 struct cm_port *cm_port;
3654
3655 cm_port = container_of(obj, struct cm_port, port_obj);
3656 kfree(cm_port);
3657 }
3658
3659 static struct kobj_type cm_port_obj_type = {
3660 .release = cm_release_port_obj
3661 };
3662
3663 static char *cm_devnode(struct device *dev, umode_t *mode)
3664 {
3665 if (mode)
3666 *mode = 0666;
3667 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
3668 }
3669
3670 struct class cm_class = {
3671 .owner = THIS_MODULE,
3672 .name = "infiniband_cm",
3673 .devnode = cm_devnode,
3674 };
3675 EXPORT_SYMBOL(cm_class);
3676
3677 static int cm_create_port_fs(struct cm_port *port)
3678 {
3679 int i, ret;
3680
3681 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type,
3682 &port->cm_dev->device->kobj,
3683 "%d", port->port_num);
3684 if (ret) {
3685 kfree(port);
3686 return ret;
3687 }
3688
3689 for (i = 0; i < CM_COUNTER_GROUPS; i++) {
3690 ret = kobject_init_and_add(&port->counter_group[i].obj,
3691 &cm_counter_obj_type,
3692 &port->port_obj,
3693 "%s", counter_group_names[i]);
3694 if (ret)
3695 goto error;
3696 }
3697
3698 return 0;
3699
3700 error:
3701 while (i--)
3702 kobject_put(&port->counter_group[i].obj);
3703 kobject_put(&port->port_obj);
3704 return ret;
3705
3706 }
3707
3708 static void cm_remove_port_fs(struct cm_port *port)
3709 {
3710 int i;
3711
3712 for (i = 0; i < CM_COUNTER_GROUPS; i++)
3713 kobject_put(&port->counter_group[i].obj);
3714
3715 kobject_put(&port->port_obj);
3716 }
3717
3718 static void cm_add_one(struct ib_device *ib_device)
3719 {
3720 struct cm_device *cm_dev;
3721 struct cm_port *port;
3722 struct ib_mad_reg_req reg_req = {
3723 .mgmt_class = IB_MGMT_CLASS_CM,
3724 .mgmt_class_version = IB_CM_CLASS_VERSION
3725 };
3726 struct ib_port_modify port_modify = {
3727 .set_port_cap_mask = IB_PORT_CM_SUP
3728 };
3729 unsigned long flags;
3730 int ret;
3731 u8 i;
3732
3733 if (rdma_node_get_transport(ib_device->node_type) != RDMA_TRANSPORT_IB)
3734 return;
3735
3736 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) *
3737 ib_device->phys_port_cnt, GFP_KERNEL);
3738 if (!cm_dev)
3739 return;
3740
3741 cm_dev->ib_device = ib_device;
3742 cm_get_ack_delay(cm_dev);
3743
3744 cm_dev->device = device_create(&cm_class, &ib_device->dev,
3745 MKDEV(0, 0), NULL,
3746 "%s", ib_device->name);
3747 if (IS_ERR(cm_dev->device)) {
3748 kfree(cm_dev);
3749 return;
3750 }
3751
3752 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3753 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3754 port = kzalloc(sizeof *port, GFP_KERNEL);
3755 if (!port)
3756 goto error1;
3757
3758 cm_dev->port[i-1] = port;
3759 port->cm_dev = cm_dev;
3760 port->port_num = i;
3761
3762 ret = cm_create_port_fs(port);
3763 if (ret)
3764 goto error1;
3765
3766 port->mad_agent = ib_register_mad_agent(ib_device, i,
3767 IB_QPT_GSI,
3768 &reg_req,
3769 0,
3770 cm_send_handler,
3771 cm_recv_handler,
3772 port);
3773 if (IS_ERR(port->mad_agent))
3774 goto error2;
3775
3776 ret = ib_modify_port(ib_device, i, 0, &port_modify);
3777 if (ret)
3778 goto error3;
3779 }
3780 ib_set_client_data(ib_device, &cm_client, cm_dev);
3781
3782 write_lock_irqsave(&cm.device_lock, flags);
3783 list_add_tail(&cm_dev->list, &cm.device_list);
3784 write_unlock_irqrestore(&cm.device_lock, flags);
3785 return;
3786
3787 error3:
3788 ib_unregister_mad_agent(port->mad_agent);
3789 error2:
3790 cm_remove_port_fs(port);
3791 error1:
3792 port_modify.set_port_cap_mask = 0;
3793 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3794 while (--i) {
3795 port = cm_dev->port[i-1];
3796 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3797 ib_unregister_mad_agent(port->mad_agent);
3798 cm_remove_port_fs(port);
3799 }
3800 device_unregister(cm_dev->device);
3801 kfree(cm_dev);
3802 }
3803
3804 static void cm_remove_one(struct ib_device *ib_device)
3805 {
3806 struct cm_device *cm_dev;
3807 struct cm_port *port;
3808 struct ib_port_modify port_modify = {
3809 .clr_port_cap_mask = IB_PORT_CM_SUP
3810 };
3811 unsigned long flags;
3812 int i;
3813
3814 cm_dev = ib_get_client_data(ib_device, &cm_client);
3815 if (!cm_dev)
3816 return;
3817
3818 write_lock_irqsave(&cm.device_lock, flags);
3819 list_del(&cm_dev->list);
3820 write_unlock_irqrestore(&cm.device_lock, flags);
3821
3822 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3823 port = cm_dev->port[i-1];
3824 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3825 ib_unregister_mad_agent(port->mad_agent);
3826 flush_workqueue(cm.wq);
3827 cm_remove_port_fs(port);
3828 }
3829 device_unregister(cm_dev->device);
3830 kfree(cm_dev);
3831 }
3832
3833 static int __init ib_cm_init(void)
3834 {
3835 int ret;
3836
3837 memset(&cm, 0, sizeof cm);
3838 INIT_LIST_HEAD(&cm.device_list);
3839 rwlock_init(&cm.device_lock);
3840 spin_lock_init(&cm.lock);
3841 cm.listen_service_table = RB_ROOT;
3842 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3843 cm.remote_id_table = RB_ROOT;
3844 cm.remote_qp_table = RB_ROOT;
3845 cm.remote_sidr_table = RB_ROOT;
3846 idr_init(&cm.local_id_table);
3847 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3848 INIT_LIST_HEAD(&cm.timewait_list);
3849
3850 ret = class_register(&cm_class);
3851 if (ret) {
3852 ret = -ENOMEM;
3853 goto error1;
3854 }
3855
3856 cm.wq = create_workqueue("ib_cm");
3857 if (!cm.wq) {
3858 ret = -ENOMEM;
3859 goto error2;
3860 }
3861
3862 ret = ib_register_client(&cm_client);
3863 if (ret)
3864 goto error3;
3865
3866 return 0;
3867 error3:
3868 destroy_workqueue(cm.wq);
3869 error2:
3870 class_unregister(&cm_class);
3871 error1:
3872 idr_destroy(&cm.local_id_table);
3873 return ret;
3874 }
3875
3876 static void __exit ib_cm_cleanup(void)
3877 {
3878 struct cm_timewait_info *timewait_info, *tmp;
3879
3880 spin_lock_irq(&cm.lock);
3881 list_for_each_entry(timewait_info, &cm.timewait_list, list)
3882 cancel_delayed_work(&timewait_info->work.work);
3883 spin_unlock_irq(&cm.lock);
3884
3885 ib_unregister_client(&cm_client);
3886 destroy_workqueue(cm.wq);
3887
3888 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
3889 list_del(&timewait_info->list);
3890 kfree(timewait_info);
3891 }
3892
3893 class_unregister(&cm_class);
3894 idr_destroy(&cm.local_id_table);
3895 }
3896
3897 module_init(ib_cm_init);
3898 module_exit(ib_cm_cleanup);
3899
Linux with added FPC-III support