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PM / Domains: Try power off masters in error path of __pm_genpd_poweron()
[linux/fpc-iii.git] / drivers / infiniband / core / cm.c
blob3a972ebf3c0d1170efe280aa7bcf781c831fa98f
1 /*
2 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved.
3 * Copyright (c) 2004 Topspin Corporation. All rights reserved.
4 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved.
5 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 */
35
36 #include <linux/completion.h>
37 #include <linux/dma-mapping.h>
38 #include <linux/device.h>
39 #include <linux/module.h>
40 #include <linux/err.h>
41 #include <linux/idr.h>
42 #include <linux/interrupt.h>
43 #include <linux/random.h>
44 #include <linux/rbtree.h>
45 #include <linux/spinlock.h>
46 #include <linux/slab.h>
47 #include <linux/sysfs.h>
48 #include <linux/workqueue.h>
49 #include <linux/kdev_t.h>
50 #include <linux/etherdevice.h>
51
52 #include <rdma/ib_cache.h>
53 #include <rdma/ib_cm.h>
54 #include "cm_msgs.h"
55
56 MODULE_AUTHOR("Sean Hefty");
57 MODULE_DESCRIPTION("InfiniBand CM");
58 MODULE_LICENSE("Dual BSD/GPL");
59
60 static void cm_add_one(struct ib_device *device);
61 static void cm_remove_one(struct ib_device *device);
62
63 static struct ib_client cm_client = {
64 .name = "cm",
65 .add = cm_add_one,
66 .remove = cm_remove_one
67 };
68
69 static struct ib_cm {
70 spinlock_t lock;
71 struct list_head device_list;
72 rwlock_t device_lock;
73 struct rb_root listen_service_table;
74 u64 listen_service_id;
75 /* struct rb_root peer_service_table; todo: fix peer to peer */
76 struct rb_root remote_qp_table;
77 struct rb_root remote_id_table;
78 struct rb_root remote_sidr_table;
79 struct idr local_id_table;
80 __be32 random_id_operand;
81 struct list_head timewait_list;
82 struct workqueue_struct *wq;
83 } cm;
84
85 /* Counter indexes ordered by attribute ID */
86 enum {
87 CM_REQ_COUNTER,
88 CM_MRA_COUNTER,
89 CM_REJ_COUNTER,
90 CM_REP_COUNTER,
91 CM_RTU_COUNTER,
92 CM_DREQ_COUNTER,
93 CM_DREP_COUNTER,
94 CM_SIDR_REQ_COUNTER,
95 CM_SIDR_REP_COUNTER,
96 CM_LAP_COUNTER,
97 CM_APR_COUNTER,
98 CM_ATTR_COUNT,
99 CM_ATTR_ID_OFFSET = 0x0010,
100 };
101
102 enum {
103 CM_XMIT,
104 CM_XMIT_RETRIES,
105 CM_RECV,
106 CM_RECV_DUPLICATES,
107 CM_COUNTER_GROUPS
108 };
109
110 static char const counter_group_names[CM_COUNTER_GROUPS]
111 [sizeof("cm_rx_duplicates")] = {
112 "cm_tx_msgs", "cm_tx_retries",
113 "cm_rx_msgs", "cm_rx_duplicates"
114 };
115
116 struct cm_counter_group {
117 struct kobject obj;
118 atomic_long_t counter[CM_ATTR_COUNT];
119 };
120
121 struct cm_counter_attribute {
122 struct attribute attr;
123 int index;
124 };
125
126 #define CM_COUNTER_ATTR(_name, _index) \
127 struct cm_counter_attribute cm_##_name##_counter_attr = { \
128 .attr = { .name = __stringify(_name), .mode = 0444 }, \
129 .index = _index \
130 }
131
132 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
133 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
134 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
135 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
136 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
137 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
138 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
139 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
140 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
141 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
142 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
143
144 static struct attribute *cm_counter_default_attrs[] = {
145 &cm_req_counter_attr.attr,
146 &cm_mra_counter_attr.attr,
147 &cm_rej_counter_attr.attr,
148 &cm_rep_counter_attr.attr,
149 &cm_rtu_counter_attr.attr,
150 &cm_dreq_counter_attr.attr,
151 &cm_drep_counter_attr.attr,
152 &cm_sidr_req_counter_attr.attr,
153 &cm_sidr_rep_counter_attr.attr,
154 &cm_lap_counter_attr.attr,
155 &cm_apr_counter_attr.attr,
156 NULL
157 };
158
159 struct cm_port {
160 struct cm_device *cm_dev;
161 struct ib_mad_agent *mad_agent;
162 struct kobject port_obj;
163 u8 port_num;
164 struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
165 };
166
167 struct cm_device {
168 struct list_head list;
169 struct ib_device *ib_device;
170 struct device *device;
171 u8 ack_delay;
172 int going_down;
173 struct cm_port *port[0];
174 };
175
176 struct cm_av {
177 struct cm_port *port;
178 union ib_gid dgid;
179 struct ib_ah_attr ah_attr;
180 u16 pkey_index;
181 u8 timeout;
182 u8 valid;
183 u8 smac[ETH_ALEN];
184 };
185
186 struct cm_work {
187 struct delayed_work work;
188 struct list_head list;
189 struct cm_port *port;
190 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
191 __be32 local_id; /* Established / timewait */
192 __be32 remote_id;
193 struct ib_cm_event cm_event;
194 struct ib_sa_path_rec path[0];
195 };
196
197 struct cm_timewait_info {
198 struct cm_work work; /* Must be first. */
199 struct list_head list;
200 struct rb_node remote_qp_node;
201 struct rb_node remote_id_node;
202 __be64 remote_ca_guid;
203 __be32 remote_qpn;
204 u8 inserted_remote_qp;
205 u8 inserted_remote_id;
206 };
207
208 struct cm_id_private {
209 struct ib_cm_id id;
210
211 struct rb_node service_node;
212 struct rb_node sidr_id_node;
213 spinlock_t lock; /* Do not acquire inside cm.lock */
214 struct completion comp;
215 atomic_t refcount;
216
217 struct ib_mad_send_buf *msg;
218 struct cm_timewait_info *timewait_info;
219 /* todo: use alternate port on send failure */
220 struct cm_av av;
221 struct cm_av alt_av;
222 struct ib_cm_compare_data *compare_data;
223
224 void *private_data;
225 __be64 tid;
226 __be32 local_qpn;
227 __be32 remote_qpn;
228 enum ib_qp_type qp_type;
229 __be32 sq_psn;
230 __be32 rq_psn;
231 int timeout_ms;
232 enum ib_mtu path_mtu;
233 __be16 pkey;
234 u8 private_data_len;
235 u8 max_cm_retries;
236 u8 peer_to_peer;
237 u8 responder_resources;
238 u8 initiator_depth;
239 u8 retry_count;
240 u8 rnr_retry_count;
241 u8 service_timeout;
242 u8 target_ack_delay;
243
244 struct list_head work_list;
245 atomic_t work_count;
246 };
247
248 static void cm_work_handler(struct work_struct *work);
249
250 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
251 {
252 if (atomic_dec_and_test(&cm_id_priv->refcount))
253 complete(&cm_id_priv->comp);
254 }
255
256 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
257 struct ib_mad_send_buf **msg)
258 {
259 struct ib_mad_agent *mad_agent;
260 struct ib_mad_send_buf *m;
261 struct ib_ah *ah;
262
263 mad_agent = cm_id_priv->av.port->mad_agent;
264 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
265 if (IS_ERR(ah))
266 return PTR_ERR(ah);
267
268 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
269 cm_id_priv->av.pkey_index,
270 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
271 GFP_ATOMIC,
272 IB_MGMT_BASE_VERSION);
273 if (IS_ERR(m)) {
274 ib_destroy_ah(ah);
275 return PTR_ERR(m);
276 }
277
278 /* Timeout set by caller if response is expected. */
279 m->ah = ah;
280 m->retries = cm_id_priv->max_cm_retries;
281
282 atomic_inc(&cm_id_priv->refcount);
283 m->context[0] = cm_id_priv;
284 *msg = m;
285 return 0;
286 }
287
288 static int cm_alloc_response_msg(struct cm_port *port,
289 struct ib_mad_recv_wc *mad_recv_wc,
290 struct ib_mad_send_buf **msg)
291 {
292 struct ib_mad_send_buf *m;
293 struct ib_ah *ah;
294
295 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
296 mad_recv_wc->recv_buf.grh, port->port_num);
297 if (IS_ERR(ah))
298 return PTR_ERR(ah);
299
300 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
301 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
302 GFP_ATOMIC,
303 IB_MGMT_BASE_VERSION);
304 if (IS_ERR(m)) {
305 ib_destroy_ah(ah);
306 return PTR_ERR(m);
307 }
308 m->ah = ah;
309 *msg = m;
310 return 0;
311 }
312
313 static void cm_free_msg(struct ib_mad_send_buf *msg)
314 {
315 ib_destroy_ah(msg->ah);
316 if (msg->context[0])
317 cm_deref_id(msg->context[0]);
318 ib_free_send_mad(msg);
319 }
320
321 static void * cm_copy_private_data(const void *private_data,
322 u8 private_data_len)
323 {
324 void *data;
325
326 if (!private_data || !private_data_len)
327 return NULL;
328
329 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
330 if (!data)
331 return ERR_PTR(-ENOMEM);
332
333 return data;
334 }
335
336 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
337 void *private_data, u8 private_data_len)
338 {
339 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
340 kfree(cm_id_priv->private_data);
341
342 cm_id_priv->private_data = private_data;
343 cm_id_priv->private_data_len = private_data_len;
344 }
345
346 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
347 struct ib_grh *grh, struct cm_av *av)
348 {
349 av->port = port;
350 av->pkey_index = wc->pkey_index;
351 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc,
352 grh, &av->ah_attr);
353 }
354
355 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
356 {
357 struct cm_device *cm_dev;
358 struct cm_port *port = NULL;
359 unsigned long flags;
360 int ret;
361 u8 p;
362
363 read_lock_irqsave(&cm.device_lock, flags);
364 list_for_each_entry(cm_dev, &cm.device_list, list) {
365 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid,
366 &p, NULL)) {
367 port = cm_dev->port[p-1];
368 break;
369 }
370 }
371 read_unlock_irqrestore(&cm.device_lock, flags);
372
373 if (!port)
374 return -EINVAL;
375
376 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
377 be16_to_cpu(path->pkey), &av->pkey_index);
378 if (ret)
379 return ret;
380
381 av->port = port;
382 ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path,
383 &av->ah_attr);
384 av->timeout = path->packet_life_time + 1;
385 memcpy(av->smac, path->smac, sizeof(av->smac));
386
387 av->valid = 1;
388 return 0;
389 }
390
391 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
392 {
393 unsigned long flags;
394 int id;
395
396 idr_preload(GFP_KERNEL);
397 spin_lock_irqsave(&cm.lock, flags);
398
399 id = idr_alloc_cyclic(&cm.local_id_table, cm_id_priv, 0, 0, GFP_NOWAIT);
400
401 spin_unlock_irqrestore(&cm.lock, flags);
402 idr_preload_end();
403
404 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
405 return id < 0 ? id : 0;
406 }
407
408 static void cm_free_id(__be32 local_id)
409 {
410 spin_lock_irq(&cm.lock);
411 idr_remove(&cm.local_id_table,
412 (__force int) (local_id ^ cm.random_id_operand));
413 spin_unlock_irq(&cm.lock);
414 }
415
416 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
417 {
418 struct cm_id_private *cm_id_priv;
419
420 cm_id_priv = idr_find(&cm.local_id_table,
421 (__force int) (local_id ^ cm.random_id_operand));
422 if (cm_id_priv) {
423 if (cm_id_priv->id.remote_id == remote_id)
424 atomic_inc(&cm_id_priv->refcount);
425 else
426 cm_id_priv = NULL;
427 }
428
429 return cm_id_priv;
430 }
431
432 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
433 {
434 struct cm_id_private *cm_id_priv;
435
436 spin_lock_irq(&cm.lock);
437 cm_id_priv = cm_get_id(local_id, remote_id);
438 spin_unlock_irq(&cm.lock);
439
440 return cm_id_priv;
441 }
442
443 static void cm_mask_copy(u32 *dst, const u32 *src, const u32 *mask)
444 {
445 int i;
446
447 for (i = 0; i < IB_CM_COMPARE_SIZE; i++)
448 dst[i] = src[i] & mask[i];
449 }
450
451 static int cm_compare_data(struct ib_cm_compare_data *src_data,
452 struct ib_cm_compare_data *dst_data)
453 {
454 u32 src[IB_CM_COMPARE_SIZE];
455 u32 dst[IB_CM_COMPARE_SIZE];
456
457 if (!src_data || !dst_data)
458 return 0;
459
460 cm_mask_copy(src, src_data->data, dst_data->mask);
461 cm_mask_copy(dst, dst_data->data, src_data->mask);
462 return memcmp(src, dst, sizeof(src));
463 }
464
465 static int cm_compare_private_data(u32 *private_data,
466 struct ib_cm_compare_data *dst_data)
467 {
468 u32 src[IB_CM_COMPARE_SIZE];
469
470 if (!dst_data)
471 return 0;
472
473 cm_mask_copy(src, private_data, dst_data->mask);
474 return memcmp(src, dst_data->data, sizeof(src));
475 }
476
477 /*
478 * Trivial helpers to strip endian annotation and compare; the
479 * endianness doesn't actually matter since we just need a stable
480 * order for the RB tree.
481 */
482 static int be32_lt(__be32 a, __be32 b)
483 {
484 return (__force u32) a < (__force u32) b;
485 }
486
487 static int be32_gt(__be32 a, __be32 b)
488 {
489 return (__force u32) a > (__force u32) b;
490 }
491
492 static int be64_lt(__be64 a, __be64 b)
493 {
494 return (__force u64) a < (__force u64) b;
495 }
496
497 static int be64_gt(__be64 a, __be64 b)
498 {
499 return (__force u64) a > (__force u64) b;
500 }
501
502 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
503 {
504 struct rb_node **link = &cm.listen_service_table.rb_node;
505 struct rb_node *parent = NULL;
506 struct cm_id_private *cur_cm_id_priv;
507 __be64 service_id = cm_id_priv->id.service_id;
508 __be64 service_mask = cm_id_priv->id.service_mask;
509 int data_cmp;
510
511 while (*link) {
512 parent = *link;
513 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
514 service_node);
515 data_cmp = cm_compare_data(cm_id_priv->compare_data,
516 cur_cm_id_priv->compare_data);
517 if ((cur_cm_id_priv->id.service_mask & service_id) ==
518 (service_mask & cur_cm_id_priv->id.service_id) &&
519 (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
520 !data_cmp)
521 return cur_cm_id_priv;
522
523 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
524 link = &(*link)->rb_left;
525 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
526 link = &(*link)->rb_right;
527 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
528 link = &(*link)->rb_left;
529 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
530 link = &(*link)->rb_right;
531 else if (data_cmp < 0)
532 link = &(*link)->rb_left;
533 else
534 link = &(*link)->rb_right;
535 }
536 rb_link_node(&cm_id_priv->service_node, parent, link);
537 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
538 return NULL;
539 }
540
541 static struct cm_id_private * cm_find_listen(struct ib_device *device,
542 __be64 service_id,
543 u32 *private_data)
544 {
545 struct rb_node *node = cm.listen_service_table.rb_node;
546 struct cm_id_private *cm_id_priv;
547 int data_cmp;
548
549 while (node) {
550 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
551 data_cmp = cm_compare_private_data(private_data,
552 cm_id_priv->compare_data);
553 if ((cm_id_priv->id.service_mask & service_id) ==
554 cm_id_priv->id.service_id &&
555 (cm_id_priv->id.device == device) && !data_cmp)
556 return cm_id_priv;
557
558 if (device < cm_id_priv->id.device)
559 node = node->rb_left;
560 else if (device > cm_id_priv->id.device)
561 node = node->rb_right;
562 else if (be64_lt(service_id, cm_id_priv->id.service_id))
563 node = node->rb_left;
564 else if (be64_gt(service_id, cm_id_priv->id.service_id))
565 node = node->rb_right;
566 else if (data_cmp < 0)
567 node = node->rb_left;
568 else
569 node = node->rb_right;
570 }
571 return NULL;
572 }
573
574 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
575 *timewait_info)
576 {
577 struct rb_node **link = &cm.remote_id_table.rb_node;
578 struct rb_node *parent = NULL;
579 struct cm_timewait_info *cur_timewait_info;
580 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
581 __be32 remote_id = timewait_info->work.remote_id;
582
583 while (*link) {
584 parent = *link;
585 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
586 remote_id_node);
587 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
588 link = &(*link)->rb_left;
589 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
590 link = &(*link)->rb_right;
591 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
592 link = &(*link)->rb_left;
593 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
594 link = &(*link)->rb_right;
595 else
596 return cur_timewait_info;
597 }
598 timewait_info->inserted_remote_id = 1;
599 rb_link_node(&timewait_info->remote_id_node, parent, link);
600 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
601 return NULL;
602 }
603
604 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
605 __be32 remote_id)
606 {
607 struct rb_node *node = cm.remote_id_table.rb_node;
608 struct cm_timewait_info *timewait_info;
609
610 while (node) {
611 timewait_info = rb_entry(node, struct cm_timewait_info,
612 remote_id_node);
613 if (be32_lt(remote_id, timewait_info->work.remote_id))
614 node = node->rb_left;
615 else if (be32_gt(remote_id, timewait_info->work.remote_id))
616 node = node->rb_right;
617 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
618 node = node->rb_left;
619 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
620 node = node->rb_right;
621 else
622 return timewait_info;
623 }
624 return NULL;
625 }
626
627 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
628 *timewait_info)
629 {
630 struct rb_node **link = &cm.remote_qp_table.rb_node;
631 struct rb_node *parent = NULL;
632 struct cm_timewait_info *cur_timewait_info;
633 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
634 __be32 remote_qpn = timewait_info->remote_qpn;
635
636 while (*link) {
637 parent = *link;
638 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
639 remote_qp_node);
640 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
641 link = &(*link)->rb_left;
642 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
643 link = &(*link)->rb_right;
644 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
645 link = &(*link)->rb_left;
646 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
647 link = &(*link)->rb_right;
648 else
649 return cur_timewait_info;
650 }
651 timewait_info->inserted_remote_qp = 1;
652 rb_link_node(&timewait_info->remote_qp_node, parent, link);
653 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
654 return NULL;
655 }
656
657 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
658 *cm_id_priv)
659 {
660 struct rb_node **link = &cm.remote_sidr_table.rb_node;
661 struct rb_node *parent = NULL;
662 struct cm_id_private *cur_cm_id_priv;
663 union ib_gid *port_gid = &cm_id_priv->av.dgid;
664 __be32 remote_id = cm_id_priv->id.remote_id;
665
666 while (*link) {
667 parent = *link;
668 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
669 sidr_id_node);
670 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
671 link = &(*link)->rb_left;
672 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
673 link = &(*link)->rb_right;
674 else {
675 int cmp;
676 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
677 sizeof *port_gid);
678 if (cmp < 0)
679 link = &(*link)->rb_left;
680 else if (cmp > 0)
681 link = &(*link)->rb_right;
682 else
683 return cur_cm_id_priv;
684 }
685 }
686 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
687 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
688 return NULL;
689 }
690
691 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
692 enum ib_cm_sidr_status status)
693 {
694 struct ib_cm_sidr_rep_param param;
695
696 memset(&param, 0, sizeof param);
697 param.status = status;
698 ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
699 }
700
701 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
702 ib_cm_handler cm_handler,
703 void *context)
704 {
705 struct cm_id_private *cm_id_priv;
706 int ret;
707
708 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
709 if (!cm_id_priv)
710 return ERR_PTR(-ENOMEM);
711
712 cm_id_priv->id.state = IB_CM_IDLE;
713 cm_id_priv->id.device = device;
714 cm_id_priv->id.cm_handler = cm_handler;
715 cm_id_priv->id.context = context;
716 cm_id_priv->id.remote_cm_qpn = 1;
717 ret = cm_alloc_id(cm_id_priv);
718 if (ret)
719 goto error;
720
721 spin_lock_init(&cm_id_priv->lock);
722 init_completion(&cm_id_priv->comp);
723 INIT_LIST_HEAD(&cm_id_priv->work_list);
724 atomic_set(&cm_id_priv->work_count, -1);
725 atomic_set(&cm_id_priv->refcount, 1);
726 return &cm_id_priv->id;
727
728 error:
729 kfree(cm_id_priv);
730 return ERR_PTR(-ENOMEM);
731 }
732 EXPORT_SYMBOL(ib_create_cm_id);
733
734 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
735 {
736 struct cm_work *work;
737
738 if (list_empty(&cm_id_priv->work_list))
739 return NULL;
740
741 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
742 list_del(&work->list);
743 return work;
744 }
745
746 static void cm_free_work(struct cm_work *work)
747 {
748 if (work->mad_recv_wc)
749 ib_free_recv_mad(work->mad_recv_wc);
750 kfree(work);
751 }
752
753 static inline int cm_convert_to_ms(int iba_time)
754 {
755 /* approximate conversion to ms from 4.096us x 2^iba_time */
756 return 1 << max(iba_time - 8, 0);
757 }
758
759 /*
760 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
761 * Because of how ack_timeout is stored, adding one doubles the timeout.
762 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
763 * increment it (round up) only if the other is within 50%.
764 */
765 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
766 {
767 int ack_timeout = packet_life_time + 1;
768
769 if (ack_timeout >= ca_ack_delay)
770 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
771 else
772 ack_timeout = ca_ack_delay +
773 (ack_timeout >= (ca_ack_delay - 1));
774
775 return min(31, ack_timeout);
776 }
777
778 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
779 {
780 if (timewait_info->inserted_remote_id) {
781 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
782 timewait_info->inserted_remote_id = 0;
783 }
784
785 if (timewait_info->inserted_remote_qp) {
786 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
787 timewait_info->inserted_remote_qp = 0;
788 }
789 }
790
791 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
792 {
793 struct cm_timewait_info *timewait_info;
794
795 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
796 if (!timewait_info)
797 return ERR_PTR(-ENOMEM);
798
799 timewait_info->work.local_id = local_id;
800 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
801 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
802 return timewait_info;
803 }
804
805 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
806 {
807 int wait_time;
808 unsigned long flags;
809 struct cm_device *cm_dev;
810
811 cm_dev = ib_get_client_data(cm_id_priv->id.device, &cm_client);
812 if (!cm_dev)
813 return;
814
815 spin_lock_irqsave(&cm.lock, flags);
816 cm_cleanup_timewait(cm_id_priv->timewait_info);
817 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
818 spin_unlock_irqrestore(&cm.lock, flags);
819
820 /*
821 * The cm_id could be destroyed by the user before we exit timewait.
822 * To protect against this, we search for the cm_id after exiting
823 * timewait before notifying the user that we've exited timewait.
824 */
825 cm_id_priv->id.state = IB_CM_TIMEWAIT;
826 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
827
828 /* Check if the device started its remove_one */
829 spin_lock_irq(&cm.lock);
830 if (!cm_dev->going_down)
831 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
832 msecs_to_jiffies(wait_time));
833 spin_unlock_irq(&cm.lock);
834
835 cm_id_priv->timewait_info = NULL;
836 }
837
838 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
839 {
840 unsigned long flags;
841
842 cm_id_priv->id.state = IB_CM_IDLE;
843 if (cm_id_priv->timewait_info) {
844 spin_lock_irqsave(&cm.lock, flags);
845 cm_cleanup_timewait(cm_id_priv->timewait_info);
846 spin_unlock_irqrestore(&cm.lock, flags);
847 kfree(cm_id_priv->timewait_info);
848 cm_id_priv->timewait_info = NULL;
849 }
850 }
851
852 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
853 {
854 struct cm_id_private *cm_id_priv;
855 struct cm_work *work;
856
857 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
858 retest:
859 spin_lock_irq(&cm_id_priv->lock);
860 switch (cm_id->state) {
861 case IB_CM_LISTEN:
862 cm_id->state = IB_CM_IDLE;
863 spin_unlock_irq(&cm_id_priv->lock);
864 spin_lock_irq(&cm.lock);
865 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
866 spin_unlock_irq(&cm.lock);
867 break;
868 case IB_CM_SIDR_REQ_SENT:
869 cm_id->state = IB_CM_IDLE;
870 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
871 spin_unlock_irq(&cm_id_priv->lock);
872 break;
873 case IB_CM_SIDR_REQ_RCVD:
874 spin_unlock_irq(&cm_id_priv->lock);
875 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
876 break;
877 case IB_CM_REQ_SENT:
878 case IB_CM_MRA_REQ_RCVD:
879 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
880 spin_unlock_irq(&cm_id_priv->lock);
881 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
882 &cm_id_priv->id.device->node_guid,
883 sizeof cm_id_priv->id.device->node_guid,
884 NULL, 0);
885 break;
886 case IB_CM_REQ_RCVD:
887 if (err == -ENOMEM) {
888 /* Do not reject to allow future retries. */
889 cm_reset_to_idle(cm_id_priv);
890 spin_unlock_irq(&cm_id_priv->lock);
891 } else {
892 spin_unlock_irq(&cm_id_priv->lock);
893 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
894 NULL, 0, NULL, 0);
895 }
896 break;
897 case IB_CM_REP_SENT:
898 case IB_CM_MRA_REP_RCVD:
899 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
900 /* Fall through */
901 case IB_CM_MRA_REQ_SENT:
902 case IB_CM_REP_RCVD:
903 case IB_CM_MRA_REP_SENT:
904 spin_unlock_irq(&cm_id_priv->lock);
905 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
906 NULL, 0, NULL, 0);
907 break;
908 case IB_CM_ESTABLISHED:
909 spin_unlock_irq(&cm_id_priv->lock);
910 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT)
911 break;
912 ib_send_cm_dreq(cm_id, NULL, 0);
913 goto retest;
914 case IB_CM_DREQ_SENT:
915 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
916 cm_enter_timewait(cm_id_priv);
917 spin_unlock_irq(&cm_id_priv->lock);
918 break;
919 case IB_CM_DREQ_RCVD:
920 spin_unlock_irq(&cm_id_priv->lock);
921 ib_send_cm_drep(cm_id, NULL, 0);
922 break;
923 default:
924 spin_unlock_irq(&cm_id_priv->lock);
925 break;
926 }
927
928 cm_free_id(cm_id->local_id);
929 cm_deref_id(cm_id_priv);
930 wait_for_completion(&cm_id_priv->comp);
931 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
932 cm_free_work(work);
933 kfree(cm_id_priv->compare_data);
934 kfree(cm_id_priv->private_data);
935 kfree(cm_id_priv);
936 }
937
938 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
939 {
940 cm_destroy_id(cm_id, 0);
941 }
942 EXPORT_SYMBOL(ib_destroy_cm_id);
943
944 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
945 struct ib_cm_compare_data *compare_data)
946 {
947 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
948 unsigned long flags;
949 int ret = 0;
950
951 service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
952 service_id &= service_mask;
953 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
954 (service_id != IB_CM_ASSIGN_SERVICE_ID))
955 return -EINVAL;
956
957 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
958 if (cm_id->state != IB_CM_IDLE)
959 return -EINVAL;
960
961 if (compare_data) {
962 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
963 GFP_KERNEL);
964 if (!cm_id_priv->compare_data)
965 return -ENOMEM;
966 cm_mask_copy(cm_id_priv->compare_data->data,
967 compare_data->data, compare_data->mask);
968 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
969 sizeof(compare_data->mask));
970 }
971
972 cm_id->state = IB_CM_LISTEN;
973
974 spin_lock_irqsave(&cm.lock, flags);
975 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
976 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
977 cm_id->service_mask = ~cpu_to_be64(0);
978 } else {
979 cm_id->service_id = service_id;
980 cm_id->service_mask = service_mask;
981 }
982 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
983 spin_unlock_irqrestore(&cm.lock, flags);
984
985 if (cur_cm_id_priv) {
986 cm_id->state = IB_CM_IDLE;
987 kfree(cm_id_priv->compare_data);
988 cm_id_priv->compare_data = NULL;
989 ret = -EBUSY;
990 }
991 return ret;
992 }
993 EXPORT_SYMBOL(ib_cm_listen);
994
995 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
996 enum cm_msg_sequence msg_seq)
997 {
998 u64 hi_tid, low_tid;
999
1000 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
1001 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
1002 (msg_seq << 30));
1003 return cpu_to_be64(hi_tid | low_tid);
1004 }
1005
1006 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
1007 __be16 attr_id, __be64 tid)
1008 {
1009 hdr->base_version = IB_MGMT_BASE_VERSION;
1010 hdr->mgmt_class = IB_MGMT_CLASS_CM;
1011 hdr->class_version = IB_CM_CLASS_VERSION;
1012 hdr->method = IB_MGMT_METHOD_SEND;
1013 hdr->attr_id = attr_id;
1014 hdr->tid = tid;
1015 }
1016
1017 static void cm_format_req(struct cm_req_msg *req_msg,
1018 struct cm_id_private *cm_id_priv,
1019 struct ib_cm_req_param *param)
1020 {
1021 struct ib_sa_path_rec *pri_path = param->primary_path;
1022 struct ib_sa_path_rec *alt_path = param->alternate_path;
1023
1024 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1025 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
1026
1027 req_msg->local_comm_id = cm_id_priv->id.local_id;
1028 req_msg->service_id = param->service_id;
1029 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1030 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
1031 cm_req_set_init_depth(req_msg, param->initiator_depth);
1032 cm_req_set_remote_resp_timeout(req_msg,
1033 param->remote_cm_response_timeout);
1034 cm_req_set_qp_type(req_msg, param->qp_type);
1035 cm_req_set_flow_ctrl(req_msg, param->flow_control);
1036 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
1037 cm_req_set_local_resp_timeout(req_msg,
1038 param->local_cm_response_timeout);
1039 req_msg->pkey = param->primary_path->pkey;
1040 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
1041 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
1042
1043 if (param->qp_type != IB_QPT_XRC_INI) {
1044 cm_req_set_resp_res(req_msg, param->responder_resources);
1045 cm_req_set_retry_count(req_msg, param->retry_count);
1046 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
1047 cm_req_set_srq(req_msg, param->srq);
1048 }
1049
1050 if (pri_path->hop_limit <= 1) {
1051 req_msg->primary_local_lid = pri_path->slid;
1052 req_msg->primary_remote_lid = pri_path->dlid;
1053 } else {
1054 /* Work-around until there's a way to obtain remote LID info */
1055 req_msg->primary_local_lid = IB_LID_PERMISSIVE;
1056 req_msg->primary_remote_lid = IB_LID_PERMISSIVE;
1057 }
1058 req_msg->primary_local_gid = pri_path->sgid;
1059 req_msg->primary_remote_gid = pri_path->dgid;
1060 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label);
1061 cm_req_set_primary_packet_rate(req_msg, pri_path->rate);
1062 req_msg->primary_traffic_class = pri_path->traffic_class;
1063 req_msg->primary_hop_limit = pri_path->hop_limit;
1064 cm_req_set_primary_sl(req_msg, pri_path->sl);
1065 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1));
1066 cm_req_set_primary_local_ack_timeout(req_msg,
1067 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1068 pri_path->packet_life_time));
1069
1070 if (alt_path) {
1071 if (alt_path->hop_limit <= 1) {
1072 req_msg->alt_local_lid = alt_path->slid;
1073 req_msg->alt_remote_lid = alt_path->dlid;
1074 } else {
1075 req_msg->alt_local_lid = IB_LID_PERMISSIVE;
1076 req_msg->alt_remote_lid = IB_LID_PERMISSIVE;
1077 }
1078 req_msg->alt_local_gid = alt_path->sgid;
1079 req_msg->alt_remote_gid = alt_path->dgid;
1080 cm_req_set_alt_flow_label(req_msg,
1081 alt_path->flow_label);
1082 cm_req_set_alt_packet_rate(req_msg, alt_path->rate);
1083 req_msg->alt_traffic_class = alt_path->traffic_class;
1084 req_msg->alt_hop_limit = alt_path->hop_limit;
1085 cm_req_set_alt_sl(req_msg, alt_path->sl);
1086 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1));
1087 cm_req_set_alt_local_ack_timeout(req_msg,
1088 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1089 alt_path->packet_life_time));
1090 }
1091
1092 if (param->private_data && param->private_data_len)
1093 memcpy(req_msg->private_data, param->private_data,
1094 param->private_data_len);
1095 }
1096
1097 static int cm_validate_req_param(struct ib_cm_req_param *param)
1098 {
1099 /* peer-to-peer not supported */
1100 if (param->peer_to_peer)
1101 return -EINVAL;
1102
1103 if (!param->primary_path)
1104 return -EINVAL;
1105
1106 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1107 param->qp_type != IB_QPT_XRC_INI)
1108 return -EINVAL;
1109
1110 if (param->private_data &&
1111 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1112 return -EINVAL;
1113
1114 if (param->alternate_path &&
1115 (param->alternate_path->pkey != param->primary_path->pkey ||
1116 param->alternate_path->mtu != param->primary_path->mtu))
1117 return -EINVAL;
1118
1119 return 0;
1120 }
1121
1122 int ib_send_cm_req(struct ib_cm_id *cm_id,
1123 struct ib_cm_req_param *param)
1124 {
1125 struct cm_id_private *cm_id_priv;
1126 struct cm_req_msg *req_msg;
1127 unsigned long flags;
1128 int ret;
1129
1130 ret = cm_validate_req_param(param);
1131 if (ret)
1132 return ret;
1133
1134 /* Verify that we're not in timewait. */
1135 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1136 spin_lock_irqsave(&cm_id_priv->lock, flags);
1137 if (cm_id->state != IB_CM_IDLE) {
1138 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1139 ret = -EINVAL;
1140 goto out;
1141 }
1142 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1143
1144 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1145 id.local_id);
1146 if (IS_ERR(cm_id_priv->timewait_info)) {
1147 ret = PTR_ERR(cm_id_priv->timewait_info);
1148 goto out;
1149 }
1150
1151 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
1152 if (ret)
1153 goto error1;
1154 if (param->alternate_path) {
1155 ret = cm_init_av_by_path(param->alternate_path,
1156 &cm_id_priv->alt_av);
1157 if (ret)
1158 goto error1;
1159 }
1160 cm_id->service_id = param->service_id;
1161 cm_id->service_mask = ~cpu_to_be64(0);
1162 cm_id_priv->timeout_ms = cm_convert_to_ms(
1163 param->primary_path->packet_life_time) * 2 +
1164 cm_convert_to_ms(
1165 param->remote_cm_response_timeout);
1166 cm_id_priv->max_cm_retries = param->max_cm_retries;
1167 cm_id_priv->initiator_depth = param->initiator_depth;
1168 cm_id_priv->responder_resources = param->responder_resources;
1169 cm_id_priv->retry_count = param->retry_count;
1170 cm_id_priv->path_mtu = param->primary_path->mtu;
1171 cm_id_priv->pkey = param->primary_path->pkey;
1172 cm_id_priv->qp_type = param->qp_type;
1173
1174 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1175 if (ret)
1176 goto error1;
1177
1178 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1179 cm_format_req(req_msg, cm_id_priv, param);
1180 cm_id_priv->tid = req_msg->hdr.tid;
1181 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1182 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1183
1184 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1185 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1186
1187 spin_lock_irqsave(&cm_id_priv->lock, flags);
1188 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1189 if (ret) {
1190 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1191 goto error2;
1192 }
1193 BUG_ON(cm_id->state != IB_CM_IDLE);
1194 cm_id->state = IB_CM_REQ_SENT;
1195 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1196 return 0;
1197
1198 error2: cm_free_msg(cm_id_priv->msg);
1199 error1: kfree(cm_id_priv->timewait_info);
1200 out: return ret;
1201 }
1202 EXPORT_SYMBOL(ib_send_cm_req);
1203
1204 static int cm_issue_rej(struct cm_port *port,
1205 struct ib_mad_recv_wc *mad_recv_wc,
1206 enum ib_cm_rej_reason reason,
1207 enum cm_msg_response msg_rejected,
1208 void *ari, u8 ari_length)
1209 {
1210 struct ib_mad_send_buf *msg = NULL;
1211 struct cm_rej_msg *rej_msg, *rcv_msg;
1212 int ret;
1213
1214 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1215 if (ret)
1216 return ret;
1217
1218 /* We just need common CM header information. Cast to any message. */
1219 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1220 rej_msg = (struct cm_rej_msg *) msg->mad;
1221
1222 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1223 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1224 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1225 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1226 rej_msg->reason = cpu_to_be16(reason);
1227
1228 if (ari && ari_length) {
1229 cm_rej_set_reject_info_len(rej_msg, ari_length);
1230 memcpy(rej_msg->ari, ari, ari_length);
1231 }
1232
1233 ret = ib_post_send_mad(msg, NULL);
1234 if (ret)
1235 cm_free_msg(msg);
1236
1237 return ret;
1238 }
1239
1240 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1241 __be32 local_qpn, __be32 remote_qpn)
1242 {
1243 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1244 ((local_ca_guid == remote_ca_guid) &&
1245 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1246 }
1247
1248 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1249 struct ib_sa_path_rec *primary_path,
1250 struct ib_sa_path_rec *alt_path)
1251 {
1252 memset(primary_path, 0, sizeof *primary_path);
1253 primary_path->dgid = req_msg->primary_local_gid;
1254 primary_path->sgid = req_msg->primary_remote_gid;
1255 primary_path->dlid = req_msg->primary_local_lid;
1256 primary_path->slid = req_msg->primary_remote_lid;
1257 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1258 primary_path->hop_limit = req_msg->primary_hop_limit;
1259 primary_path->traffic_class = req_msg->primary_traffic_class;
1260 primary_path->reversible = 1;
1261 primary_path->pkey = req_msg->pkey;
1262 primary_path->sl = cm_req_get_primary_sl(req_msg);
1263 primary_path->mtu_selector = IB_SA_EQ;
1264 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1265 primary_path->rate_selector = IB_SA_EQ;
1266 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1267 primary_path->packet_life_time_selector = IB_SA_EQ;
1268 primary_path->packet_life_time =
1269 cm_req_get_primary_local_ack_timeout(req_msg);
1270 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1271
1272 if (req_msg->alt_local_lid) {
1273 memset(alt_path, 0, sizeof *alt_path);
1274 alt_path->dgid = req_msg->alt_local_gid;
1275 alt_path->sgid = req_msg->alt_remote_gid;
1276 alt_path->dlid = req_msg->alt_local_lid;
1277 alt_path->slid = req_msg->alt_remote_lid;
1278 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1279 alt_path->hop_limit = req_msg->alt_hop_limit;
1280 alt_path->traffic_class = req_msg->alt_traffic_class;
1281 alt_path->reversible = 1;
1282 alt_path->pkey = req_msg->pkey;
1283 alt_path->sl = cm_req_get_alt_sl(req_msg);
1284 alt_path->mtu_selector = IB_SA_EQ;
1285 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1286 alt_path->rate_selector = IB_SA_EQ;
1287 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1288 alt_path->packet_life_time_selector = IB_SA_EQ;
1289 alt_path->packet_life_time =
1290 cm_req_get_alt_local_ack_timeout(req_msg);
1291 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1292 }
1293 }
1294
1295 static void cm_format_req_event(struct cm_work *work,
1296 struct cm_id_private *cm_id_priv,
1297 struct ib_cm_id *listen_id)
1298 {
1299 struct cm_req_msg *req_msg;
1300 struct ib_cm_req_event_param *param;
1301
1302 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1303 param = &work->cm_event.param.req_rcvd;
1304 param->listen_id = listen_id;
1305 param->port = cm_id_priv->av.port->port_num;
1306 param->primary_path = &work->path[0];
1307 if (req_msg->alt_local_lid)
1308 param->alternate_path = &work->path[1];
1309 else
1310 param->alternate_path = NULL;
1311 param->remote_ca_guid = req_msg->local_ca_guid;
1312 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1313 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1314 param->qp_type = cm_req_get_qp_type(req_msg);
1315 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1316 param->responder_resources = cm_req_get_init_depth(req_msg);
1317 param->initiator_depth = cm_req_get_resp_res(req_msg);
1318 param->local_cm_response_timeout =
1319 cm_req_get_remote_resp_timeout(req_msg);
1320 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1321 param->remote_cm_response_timeout =
1322 cm_req_get_local_resp_timeout(req_msg);
1323 param->retry_count = cm_req_get_retry_count(req_msg);
1324 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1325 param->srq = cm_req_get_srq(req_msg);
1326 work->cm_event.private_data = &req_msg->private_data;
1327 }
1328
1329 static void cm_process_work(struct cm_id_private *cm_id_priv,
1330 struct cm_work *work)
1331 {
1332 int ret;
1333
1334 /* We will typically only have the current event to report. */
1335 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1336 cm_free_work(work);
1337
1338 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1339 spin_lock_irq(&cm_id_priv->lock);
1340 work = cm_dequeue_work(cm_id_priv);
1341 spin_unlock_irq(&cm_id_priv->lock);
1342 BUG_ON(!work);
1343 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1344 &work->cm_event);
1345 cm_free_work(work);
1346 }
1347 cm_deref_id(cm_id_priv);
1348 if (ret)
1349 cm_destroy_id(&cm_id_priv->id, ret);
1350 }
1351
1352 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1353 struct cm_id_private *cm_id_priv,
1354 enum cm_msg_response msg_mraed, u8 service_timeout,
1355 const void *private_data, u8 private_data_len)
1356 {
1357 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1358 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1359 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1360 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1361 cm_mra_set_service_timeout(mra_msg, service_timeout);
1362
1363 if (private_data && private_data_len)
1364 memcpy(mra_msg->private_data, private_data, private_data_len);
1365 }
1366
1367 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1368 struct cm_id_private *cm_id_priv,
1369 enum ib_cm_rej_reason reason,
1370 void *ari,
1371 u8 ari_length,
1372 const void *private_data,
1373 u8 private_data_len)
1374 {
1375 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1376 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1377
1378 switch(cm_id_priv->id.state) {
1379 case IB_CM_REQ_RCVD:
1380 rej_msg->local_comm_id = 0;
1381 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1382 break;
1383 case IB_CM_MRA_REQ_SENT:
1384 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1385 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1386 break;
1387 case IB_CM_REP_RCVD:
1388 case IB_CM_MRA_REP_SENT:
1389 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1390 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1391 break;
1392 default:
1393 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1394 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1395 break;
1396 }
1397
1398 rej_msg->reason = cpu_to_be16(reason);
1399 if (ari && ari_length) {
1400 cm_rej_set_reject_info_len(rej_msg, ari_length);
1401 memcpy(rej_msg->ari, ari, ari_length);
1402 }
1403
1404 if (private_data && private_data_len)
1405 memcpy(rej_msg->private_data, private_data, private_data_len);
1406 }
1407
1408 static void cm_dup_req_handler(struct cm_work *work,
1409 struct cm_id_private *cm_id_priv)
1410 {
1411 struct ib_mad_send_buf *msg = NULL;
1412 int ret;
1413
1414 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1415 counter[CM_REQ_COUNTER]);
1416
1417 /* Quick state check to discard duplicate REQs. */
1418 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1419 return;
1420
1421 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1422 if (ret)
1423 return;
1424
1425 spin_lock_irq(&cm_id_priv->lock);
1426 switch (cm_id_priv->id.state) {
1427 case IB_CM_MRA_REQ_SENT:
1428 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1429 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1430 cm_id_priv->private_data,
1431 cm_id_priv->private_data_len);
1432 break;
1433 case IB_CM_TIMEWAIT:
1434 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1435 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1436 break;
1437 default:
1438 goto unlock;
1439 }
1440 spin_unlock_irq(&cm_id_priv->lock);
1441
1442 ret = ib_post_send_mad(msg, NULL);
1443 if (ret)
1444 goto free;
1445 return;
1446
1447 unlock: spin_unlock_irq(&cm_id_priv->lock);
1448 free: cm_free_msg(msg);
1449 }
1450
1451 static struct cm_id_private * cm_match_req(struct cm_work *work,
1452 struct cm_id_private *cm_id_priv)
1453 {
1454 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1455 struct cm_timewait_info *timewait_info;
1456 struct cm_req_msg *req_msg;
1457
1458 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1459
1460 /* Check for possible duplicate REQ. */
1461 spin_lock_irq(&cm.lock);
1462 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1463 if (timewait_info) {
1464 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1465 timewait_info->work.remote_id);
1466 spin_unlock_irq(&cm.lock);
1467 if (cur_cm_id_priv) {
1468 cm_dup_req_handler(work, cur_cm_id_priv);
1469 cm_deref_id(cur_cm_id_priv);
1470 }
1471 return NULL;
1472 }
1473
1474 /* Check for stale connections. */
1475 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1476 if (timewait_info) {
1477 cm_cleanup_timewait(cm_id_priv->timewait_info);
1478 spin_unlock_irq(&cm.lock);
1479 cm_issue_rej(work->port, work->mad_recv_wc,
1480 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1481 NULL, 0);
1482 return NULL;
1483 }
1484
1485 /* Find matching listen request. */
1486 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1487 req_msg->service_id,
1488 req_msg->private_data);
1489 if (!listen_cm_id_priv) {
1490 cm_cleanup_timewait(cm_id_priv->timewait_info);
1491 spin_unlock_irq(&cm.lock);
1492 cm_issue_rej(work->port, work->mad_recv_wc,
1493 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1494 NULL, 0);
1495 goto out;
1496 }
1497 atomic_inc(&listen_cm_id_priv->refcount);
1498 atomic_inc(&cm_id_priv->refcount);
1499 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1500 atomic_inc(&cm_id_priv->work_count);
1501 spin_unlock_irq(&cm.lock);
1502 out:
1503 return listen_cm_id_priv;
1504 }
1505
1506 /*
1507 * Work-around for inter-subnet connections. If the LIDs are permissive,
1508 * we need to override the LID/SL data in the REQ with the LID information
1509 * in the work completion.
1510 */
1511 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
1512 {
1513 if (!cm_req_get_primary_subnet_local(req_msg)) {
1514 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) {
1515 req_msg->primary_local_lid = cpu_to_be16(wc->slid);
1516 cm_req_set_primary_sl(req_msg, wc->sl);
1517 }
1518
1519 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE)
1520 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1521 }
1522
1523 if (!cm_req_get_alt_subnet_local(req_msg)) {
1524 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) {
1525 req_msg->alt_local_lid = cpu_to_be16(wc->slid);
1526 cm_req_set_alt_sl(req_msg, wc->sl);
1527 }
1528
1529 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE)
1530 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1531 }
1532 }
1533
1534 static int cm_req_handler(struct cm_work *work)
1535 {
1536 struct ib_cm_id *cm_id;
1537 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1538 struct cm_req_msg *req_msg;
1539 int ret;
1540
1541 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1542
1543 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
1544 if (IS_ERR(cm_id))
1545 return PTR_ERR(cm_id);
1546
1547 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1548 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1549 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1550 work->mad_recv_wc->recv_buf.grh,
1551 &cm_id_priv->av);
1552 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1553 id.local_id);
1554 if (IS_ERR(cm_id_priv->timewait_info)) {
1555 ret = PTR_ERR(cm_id_priv->timewait_info);
1556 goto destroy;
1557 }
1558 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1559 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1560 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1561
1562 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1563 if (!listen_cm_id_priv) {
1564 ret = -EINVAL;
1565 kfree(cm_id_priv->timewait_info);
1566 goto destroy;
1567 }
1568
1569 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1570 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1571 cm_id_priv->id.service_id = req_msg->service_id;
1572 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1573
1574 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
1575 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1576
1577 memcpy(work->path[0].dmac, cm_id_priv->av.ah_attr.dmac, ETH_ALEN);
1578 work->path[0].vlan_id = cm_id_priv->av.ah_attr.vlan_id;
1579 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1580 if (ret) {
1581 ib_get_cached_gid(work->port->cm_dev->ib_device,
1582 work->port->port_num, 0, &work->path[0].sgid);
1583 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1584 &work->path[0].sgid, sizeof work->path[0].sgid,
1585 NULL, 0);
1586 goto rejected;
1587 }
1588 if (req_msg->alt_local_lid) {
1589 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1590 if (ret) {
1591 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1592 &work->path[0].sgid,
1593 sizeof work->path[0].sgid, NULL, 0);
1594 goto rejected;
1595 }
1596 }
1597 cm_id_priv->tid = req_msg->hdr.tid;
1598 cm_id_priv->timeout_ms = cm_convert_to_ms(
1599 cm_req_get_local_resp_timeout(req_msg));
1600 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1601 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1602 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1603 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1604 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1605 cm_id_priv->pkey = req_msg->pkey;
1606 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1607 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1608 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1609 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1610
1611 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1612 cm_process_work(cm_id_priv, work);
1613 cm_deref_id(listen_cm_id_priv);
1614 return 0;
1615
1616 rejected:
1617 atomic_dec(&cm_id_priv->refcount);
1618 cm_deref_id(listen_cm_id_priv);
1619 destroy:
1620 ib_destroy_cm_id(cm_id);
1621 return ret;
1622 }
1623
1624 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1625 struct cm_id_private *cm_id_priv,
1626 struct ib_cm_rep_param *param)
1627 {
1628 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1629 rep_msg->local_comm_id = cm_id_priv->id.local_id;
1630 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1631 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1632 rep_msg->resp_resources = param->responder_resources;
1633 cm_rep_set_target_ack_delay(rep_msg,
1634 cm_id_priv->av.port->cm_dev->ack_delay);
1635 cm_rep_set_failover(rep_msg, param->failover_accepted);
1636 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1637 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1638
1639 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
1640 rep_msg->initiator_depth = param->initiator_depth;
1641 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1642 cm_rep_set_srq(rep_msg, param->srq);
1643 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1644 } else {
1645 cm_rep_set_srq(rep_msg, 1);
1646 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num));
1647 }
1648
1649 if (param->private_data && param->private_data_len)
1650 memcpy(rep_msg->private_data, param->private_data,
1651 param->private_data_len);
1652 }
1653
1654 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1655 struct ib_cm_rep_param *param)
1656 {
1657 struct cm_id_private *cm_id_priv;
1658 struct ib_mad_send_buf *msg;
1659 struct cm_rep_msg *rep_msg;
1660 unsigned long flags;
1661 int ret;
1662
1663 if (param->private_data &&
1664 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1665 return -EINVAL;
1666
1667 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1668 spin_lock_irqsave(&cm_id_priv->lock, flags);
1669 if (cm_id->state != IB_CM_REQ_RCVD &&
1670 cm_id->state != IB_CM_MRA_REQ_SENT) {
1671 ret = -EINVAL;
1672 goto out;
1673 }
1674
1675 ret = cm_alloc_msg(cm_id_priv, &msg);
1676 if (ret)
1677 goto out;
1678
1679 rep_msg = (struct cm_rep_msg *) msg->mad;
1680 cm_format_rep(rep_msg, cm_id_priv, param);
1681 msg->timeout_ms = cm_id_priv->timeout_ms;
1682 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1683
1684 ret = ib_post_send_mad(msg, NULL);
1685 if (ret) {
1686 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1687 cm_free_msg(msg);
1688 return ret;
1689 }
1690
1691 cm_id->state = IB_CM_REP_SENT;
1692 cm_id_priv->msg = msg;
1693 cm_id_priv->initiator_depth = param->initiator_depth;
1694 cm_id_priv->responder_resources = param->responder_resources;
1695 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1696 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
1697
1698 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1699 return ret;
1700 }
1701 EXPORT_SYMBOL(ib_send_cm_rep);
1702
1703 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1704 struct cm_id_private *cm_id_priv,
1705 const void *private_data,
1706 u8 private_data_len)
1707 {
1708 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1709 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1710 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1711
1712 if (private_data && private_data_len)
1713 memcpy(rtu_msg->private_data, private_data, private_data_len);
1714 }
1715
1716 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1717 const void *private_data,
1718 u8 private_data_len)
1719 {
1720 struct cm_id_private *cm_id_priv;
1721 struct ib_mad_send_buf *msg;
1722 unsigned long flags;
1723 void *data;
1724 int ret;
1725
1726 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1727 return -EINVAL;
1728
1729 data = cm_copy_private_data(private_data, private_data_len);
1730 if (IS_ERR(data))
1731 return PTR_ERR(data);
1732
1733 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1734 spin_lock_irqsave(&cm_id_priv->lock, flags);
1735 if (cm_id->state != IB_CM_REP_RCVD &&
1736 cm_id->state != IB_CM_MRA_REP_SENT) {
1737 ret = -EINVAL;
1738 goto error;
1739 }
1740
1741 ret = cm_alloc_msg(cm_id_priv, &msg);
1742 if (ret)
1743 goto error;
1744
1745 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1746 private_data, private_data_len);
1747
1748 ret = ib_post_send_mad(msg, NULL);
1749 if (ret) {
1750 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1751 cm_free_msg(msg);
1752 kfree(data);
1753 return ret;
1754 }
1755
1756 cm_id->state = IB_CM_ESTABLISHED;
1757 cm_set_private_data(cm_id_priv, data, private_data_len);
1758 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1759 return 0;
1760
1761 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1762 kfree(data);
1763 return ret;
1764 }
1765 EXPORT_SYMBOL(ib_send_cm_rtu);
1766
1767 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
1768 {
1769 struct cm_rep_msg *rep_msg;
1770 struct ib_cm_rep_event_param *param;
1771
1772 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1773 param = &work->cm_event.param.rep_rcvd;
1774 param->remote_ca_guid = rep_msg->local_ca_guid;
1775 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1776 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
1777 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1778 param->responder_resources = rep_msg->initiator_depth;
1779 param->initiator_depth = rep_msg->resp_resources;
1780 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1781 param->failover_accepted = cm_rep_get_failover(rep_msg);
1782 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1783 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1784 param->srq = cm_rep_get_srq(rep_msg);
1785 work->cm_event.private_data = &rep_msg->private_data;
1786 }
1787
1788 static void cm_dup_rep_handler(struct cm_work *work)
1789 {
1790 struct cm_id_private *cm_id_priv;
1791 struct cm_rep_msg *rep_msg;
1792 struct ib_mad_send_buf *msg = NULL;
1793 int ret;
1794
1795 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1796 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1797 rep_msg->local_comm_id);
1798 if (!cm_id_priv)
1799 return;
1800
1801 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1802 counter[CM_REP_COUNTER]);
1803 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1804 if (ret)
1805 goto deref;
1806
1807 spin_lock_irq(&cm_id_priv->lock);
1808 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1809 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1810 cm_id_priv->private_data,
1811 cm_id_priv->private_data_len);
1812 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1813 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1814 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1815 cm_id_priv->private_data,
1816 cm_id_priv->private_data_len);
1817 else
1818 goto unlock;
1819 spin_unlock_irq(&cm_id_priv->lock);
1820
1821 ret = ib_post_send_mad(msg, NULL);
1822 if (ret)
1823 goto free;
1824 goto deref;
1825
1826 unlock: spin_unlock_irq(&cm_id_priv->lock);
1827 free: cm_free_msg(msg);
1828 deref: cm_deref_id(cm_id_priv);
1829 }
1830
1831 static int cm_rep_handler(struct cm_work *work)
1832 {
1833 struct cm_id_private *cm_id_priv;
1834 struct cm_rep_msg *rep_msg;
1835 int ret;
1836
1837 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1838 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1839 if (!cm_id_priv) {
1840 cm_dup_rep_handler(work);
1841 return -EINVAL;
1842 }
1843
1844 cm_format_rep_event(work, cm_id_priv->qp_type);
1845
1846 spin_lock_irq(&cm_id_priv->lock);
1847 switch (cm_id_priv->id.state) {
1848 case IB_CM_REQ_SENT:
1849 case IB_CM_MRA_REQ_RCVD:
1850 break;
1851 default:
1852 spin_unlock_irq(&cm_id_priv->lock);
1853 ret = -EINVAL;
1854 goto error;
1855 }
1856
1857 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1858 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1859 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
1860
1861 spin_lock(&cm.lock);
1862 /* Check for duplicate REP. */
1863 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1864 spin_unlock(&cm.lock);
1865 spin_unlock_irq(&cm_id_priv->lock);
1866 ret = -EINVAL;
1867 goto error;
1868 }
1869 /* Check for a stale connection. */
1870 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1871 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1872 &cm.remote_id_table);
1873 cm_id_priv->timewait_info->inserted_remote_id = 0;
1874 spin_unlock(&cm.lock);
1875 spin_unlock_irq(&cm_id_priv->lock);
1876 cm_issue_rej(work->port, work->mad_recv_wc,
1877 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1878 NULL, 0);
1879 ret = -EINVAL;
1880 goto error;
1881 }
1882 spin_unlock(&cm.lock);
1883
1884 cm_id_priv->id.state = IB_CM_REP_RCVD;
1885 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1886 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
1887 cm_id_priv->initiator_depth = rep_msg->resp_resources;
1888 cm_id_priv->responder_resources = rep_msg->initiator_depth;
1889 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1890 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1891 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1892 cm_id_priv->av.timeout =
1893 cm_ack_timeout(cm_id_priv->target_ack_delay,
1894 cm_id_priv->av.timeout - 1);
1895 cm_id_priv->alt_av.timeout =
1896 cm_ack_timeout(cm_id_priv->target_ack_delay,
1897 cm_id_priv->alt_av.timeout - 1);
1898
1899 /* todo: handle peer_to_peer */
1900
1901 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1902 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1903 if (!ret)
1904 list_add_tail(&work->list, &cm_id_priv->work_list);
1905 spin_unlock_irq(&cm_id_priv->lock);
1906
1907 if (ret)
1908 cm_process_work(cm_id_priv, work);
1909 else
1910 cm_deref_id(cm_id_priv);
1911 return 0;
1912
1913 error:
1914 cm_deref_id(cm_id_priv);
1915 return ret;
1916 }
1917
1918 static int cm_establish_handler(struct cm_work *work)
1919 {
1920 struct cm_id_private *cm_id_priv;
1921 int ret;
1922
1923 /* See comment in cm_establish about lookup. */
1924 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1925 if (!cm_id_priv)
1926 return -EINVAL;
1927
1928 spin_lock_irq(&cm_id_priv->lock);
1929 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1930 spin_unlock_irq(&cm_id_priv->lock);
1931 goto out;
1932 }
1933
1934 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1935 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1936 if (!ret)
1937 list_add_tail(&work->list, &cm_id_priv->work_list);
1938 spin_unlock_irq(&cm_id_priv->lock);
1939
1940 if (ret)
1941 cm_process_work(cm_id_priv, work);
1942 else
1943 cm_deref_id(cm_id_priv);
1944 return 0;
1945 out:
1946 cm_deref_id(cm_id_priv);
1947 return -EINVAL;
1948 }
1949
1950 static int cm_rtu_handler(struct cm_work *work)
1951 {
1952 struct cm_id_private *cm_id_priv;
1953 struct cm_rtu_msg *rtu_msg;
1954 int ret;
1955
1956 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1957 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1958 rtu_msg->local_comm_id);
1959 if (!cm_id_priv)
1960 return -EINVAL;
1961
1962 work->cm_event.private_data = &rtu_msg->private_data;
1963
1964 spin_lock_irq(&cm_id_priv->lock);
1965 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1966 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1967 spin_unlock_irq(&cm_id_priv->lock);
1968 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1969 counter[CM_RTU_COUNTER]);
1970 goto out;
1971 }
1972 cm_id_priv->id.state = IB_CM_ESTABLISHED;
1973
1974 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1975 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1976 if (!ret)
1977 list_add_tail(&work->list, &cm_id_priv->work_list);
1978 spin_unlock_irq(&cm_id_priv->lock);
1979
1980 if (ret)
1981 cm_process_work(cm_id_priv, work);
1982 else
1983 cm_deref_id(cm_id_priv);
1984 return 0;
1985 out:
1986 cm_deref_id(cm_id_priv);
1987 return -EINVAL;
1988 }
1989
1990 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1991 struct cm_id_private *cm_id_priv,
1992 const void *private_data,
1993 u8 private_data_len)
1994 {
1995 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1996 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1997 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1998 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1999 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
2000
2001 if (private_data && private_data_len)
2002 memcpy(dreq_msg->private_data, private_data, private_data_len);
2003 }
2004
2005 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
2006 const void *private_data,
2007 u8 private_data_len)
2008 {
2009 struct cm_id_private *cm_id_priv;
2010 struct ib_mad_send_buf *msg;
2011 unsigned long flags;
2012 int ret;
2013
2014 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
2015 return -EINVAL;
2016
2017 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2018 spin_lock_irqsave(&cm_id_priv->lock, flags);
2019 if (cm_id->state != IB_CM_ESTABLISHED) {
2020 ret = -EINVAL;
2021 goto out;
2022 }
2023
2024 if (cm_id->lap_state == IB_CM_LAP_SENT ||
2025 cm_id->lap_state == IB_CM_MRA_LAP_RCVD)
2026 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2027
2028 ret = cm_alloc_msg(cm_id_priv, &msg);
2029 if (ret) {
2030 cm_enter_timewait(cm_id_priv);
2031 goto out;
2032 }
2033
2034 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2035 private_data, private_data_len);
2036 msg->timeout_ms = cm_id_priv->timeout_ms;
2037 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2038
2039 ret = ib_post_send_mad(msg, NULL);
2040 if (ret) {
2041 cm_enter_timewait(cm_id_priv);
2042 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2043 cm_free_msg(msg);
2044 return ret;
2045 }
2046
2047 cm_id->state = IB_CM_DREQ_SENT;
2048 cm_id_priv->msg = msg;
2049 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2050 return ret;
2051 }
2052 EXPORT_SYMBOL(ib_send_cm_dreq);
2053
2054 static void cm_format_drep(struct cm_drep_msg *drep_msg,
2055 struct cm_id_private *cm_id_priv,
2056 const void *private_data,
2057 u8 private_data_len)
2058 {
2059 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2060 drep_msg->local_comm_id = cm_id_priv->id.local_id;
2061 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2062
2063 if (private_data && private_data_len)
2064 memcpy(drep_msg->private_data, private_data, private_data_len);
2065 }
2066
2067 int ib_send_cm_drep(struct ib_cm_id *cm_id,
2068 const void *private_data,
2069 u8 private_data_len)
2070 {
2071 struct cm_id_private *cm_id_priv;
2072 struct ib_mad_send_buf *msg;
2073 unsigned long flags;
2074 void *data;
2075 int ret;
2076
2077 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2078 return -EINVAL;
2079
2080 data = cm_copy_private_data(private_data, private_data_len);
2081 if (IS_ERR(data))
2082 return PTR_ERR(data);
2083
2084 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2085 spin_lock_irqsave(&cm_id_priv->lock, flags);
2086 if (cm_id->state != IB_CM_DREQ_RCVD) {
2087 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2088 kfree(data);
2089 return -EINVAL;
2090 }
2091
2092 cm_set_private_data(cm_id_priv, data, private_data_len);
2093 cm_enter_timewait(cm_id_priv);
2094
2095 ret = cm_alloc_msg(cm_id_priv, &msg);
2096 if (ret)
2097 goto out;
2098
2099 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2100 private_data, private_data_len);
2101
2102 ret = ib_post_send_mad(msg, NULL);
2103 if (ret) {
2104 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2105 cm_free_msg(msg);
2106 return ret;
2107 }
2108
2109 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2110 return ret;
2111 }
2112 EXPORT_SYMBOL(ib_send_cm_drep);
2113
2114 static int cm_issue_drep(struct cm_port *port,
2115 struct ib_mad_recv_wc *mad_recv_wc)
2116 {
2117 struct ib_mad_send_buf *msg = NULL;
2118 struct cm_dreq_msg *dreq_msg;
2119 struct cm_drep_msg *drep_msg;
2120 int ret;
2121
2122 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2123 if (ret)
2124 return ret;
2125
2126 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2127 drep_msg = (struct cm_drep_msg *) msg->mad;
2128
2129 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2130 drep_msg->remote_comm_id = dreq_msg->local_comm_id;
2131 drep_msg->local_comm_id = dreq_msg->remote_comm_id;
2132
2133 ret = ib_post_send_mad(msg, NULL);
2134 if (ret)
2135 cm_free_msg(msg);
2136
2137 return ret;
2138 }
2139
2140 static int cm_dreq_handler(struct cm_work *work)
2141 {
2142 struct cm_id_private *cm_id_priv;
2143 struct cm_dreq_msg *dreq_msg;
2144 struct ib_mad_send_buf *msg = NULL;
2145 int ret;
2146
2147 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2148 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
2149 dreq_msg->local_comm_id);
2150 if (!cm_id_priv) {
2151 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2152 counter[CM_DREQ_COUNTER]);
2153 cm_issue_drep(work->port, work->mad_recv_wc);
2154 return -EINVAL;
2155 }
2156
2157 work->cm_event.private_data = &dreq_msg->private_data;
2158
2159 spin_lock_irq(&cm_id_priv->lock);
2160 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
2161 goto unlock;
2162
2163 switch (cm_id_priv->id.state) {
2164 case IB_CM_REP_SENT:
2165 case IB_CM_DREQ_SENT:
2166 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2167 break;
2168 case IB_CM_ESTABLISHED:
2169 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2170 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2171 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2172 break;
2173 case IB_CM_MRA_REP_RCVD:
2174 break;
2175 case IB_CM_TIMEWAIT:
2176 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2177 counter[CM_DREQ_COUNTER]);
2178 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2179 goto unlock;
2180
2181 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2182 cm_id_priv->private_data,
2183 cm_id_priv->private_data_len);
2184 spin_unlock_irq(&cm_id_priv->lock);
2185
2186 if (ib_post_send_mad(msg, NULL))
2187 cm_free_msg(msg);
2188 goto deref;
2189 case IB_CM_DREQ_RCVD:
2190 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2191 counter[CM_DREQ_COUNTER]);
2192 goto unlock;
2193 default:
2194 goto unlock;
2195 }
2196 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2197 cm_id_priv->tid = dreq_msg->hdr.tid;
2198 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2199 if (!ret)
2200 list_add_tail(&work->list, &cm_id_priv->work_list);
2201 spin_unlock_irq(&cm_id_priv->lock);
2202
2203 if (ret)
2204 cm_process_work(cm_id_priv, work);
2205 else
2206 cm_deref_id(cm_id_priv);
2207 return 0;
2208
2209 unlock: spin_unlock_irq(&cm_id_priv->lock);
2210 deref: cm_deref_id(cm_id_priv);
2211 return -EINVAL;
2212 }
2213
2214 static int cm_drep_handler(struct cm_work *work)
2215 {
2216 struct cm_id_private *cm_id_priv;
2217 struct cm_drep_msg *drep_msg;
2218 int ret;
2219
2220 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2221 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2222 drep_msg->local_comm_id);
2223 if (!cm_id_priv)
2224 return -EINVAL;
2225
2226 work->cm_event.private_data = &drep_msg->private_data;
2227
2228 spin_lock_irq(&cm_id_priv->lock);
2229 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2230 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2231 spin_unlock_irq(&cm_id_priv->lock);
2232 goto out;
2233 }
2234 cm_enter_timewait(cm_id_priv);
2235
2236 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2237 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2238 if (!ret)
2239 list_add_tail(&work->list, &cm_id_priv->work_list);
2240 spin_unlock_irq(&cm_id_priv->lock);
2241
2242 if (ret)
2243 cm_process_work(cm_id_priv, work);
2244 else
2245 cm_deref_id(cm_id_priv);
2246 return 0;
2247 out:
2248 cm_deref_id(cm_id_priv);
2249 return -EINVAL;
2250 }
2251
2252 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2253 enum ib_cm_rej_reason reason,
2254 void *ari,
2255 u8 ari_length,
2256 const void *private_data,
2257 u8 private_data_len)
2258 {
2259 struct cm_id_private *cm_id_priv;
2260 struct ib_mad_send_buf *msg;
2261 unsigned long flags;
2262 int ret;
2263
2264 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2265 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2266 return -EINVAL;
2267
2268 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2269
2270 spin_lock_irqsave(&cm_id_priv->lock, flags);
2271 switch (cm_id->state) {
2272 case IB_CM_REQ_SENT:
2273 case IB_CM_MRA_REQ_RCVD:
2274 case IB_CM_REQ_RCVD:
2275 case IB_CM_MRA_REQ_SENT:
2276 case IB_CM_REP_RCVD:
2277 case IB_CM_MRA_REP_SENT:
2278 ret = cm_alloc_msg(cm_id_priv, &msg);
2279 if (!ret)
2280 cm_format_rej((struct cm_rej_msg *) msg->mad,
2281 cm_id_priv, reason, ari, ari_length,
2282 private_data, private_data_len);
2283
2284 cm_reset_to_idle(cm_id_priv);
2285 break;
2286 case IB_CM_REP_SENT:
2287 case IB_CM_MRA_REP_RCVD:
2288 ret = cm_alloc_msg(cm_id_priv, &msg);
2289 if (!ret)
2290 cm_format_rej((struct cm_rej_msg *) msg->mad,
2291 cm_id_priv, reason, ari, ari_length,
2292 private_data, private_data_len);
2293
2294 cm_enter_timewait(cm_id_priv);
2295 break;
2296 default:
2297 ret = -EINVAL;
2298 goto out;
2299 }
2300
2301 if (ret)
2302 goto out;
2303
2304 ret = ib_post_send_mad(msg, NULL);
2305 if (ret)
2306 cm_free_msg(msg);
2307
2308 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2309 return ret;
2310 }
2311 EXPORT_SYMBOL(ib_send_cm_rej);
2312
2313 static void cm_format_rej_event(struct cm_work *work)
2314 {
2315 struct cm_rej_msg *rej_msg;
2316 struct ib_cm_rej_event_param *param;
2317
2318 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2319 param = &work->cm_event.param.rej_rcvd;
2320 param->ari = rej_msg->ari;
2321 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2322 param->reason = __be16_to_cpu(rej_msg->reason);
2323 work->cm_event.private_data = &rej_msg->private_data;
2324 }
2325
2326 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2327 {
2328 struct cm_timewait_info *timewait_info;
2329 struct cm_id_private *cm_id_priv;
2330 __be32 remote_id;
2331
2332 remote_id = rej_msg->local_comm_id;
2333
2334 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2335 spin_lock_irq(&cm.lock);
2336 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2337 remote_id);
2338 if (!timewait_info) {
2339 spin_unlock_irq(&cm.lock);
2340 return NULL;
2341 }
2342 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2343 (timewait_info->work.local_id ^
2344 cm.random_id_operand));
2345 if (cm_id_priv) {
2346 if (cm_id_priv->id.remote_id == remote_id)
2347 atomic_inc(&cm_id_priv->refcount);
2348 else
2349 cm_id_priv = NULL;
2350 }
2351 spin_unlock_irq(&cm.lock);
2352 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2353 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2354 else
2355 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2356
2357 return cm_id_priv;
2358 }
2359
2360 static int cm_rej_handler(struct cm_work *work)
2361 {
2362 struct cm_id_private *cm_id_priv;
2363 struct cm_rej_msg *rej_msg;
2364 int ret;
2365
2366 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2367 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2368 if (!cm_id_priv)
2369 return -EINVAL;
2370
2371 cm_format_rej_event(work);
2372
2373 spin_lock_irq(&cm_id_priv->lock);
2374 switch (cm_id_priv->id.state) {
2375 case IB_CM_REQ_SENT:
2376 case IB_CM_MRA_REQ_RCVD:
2377 case IB_CM_REP_SENT:
2378 case IB_CM_MRA_REP_RCVD:
2379 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2380 /* fall through */
2381 case IB_CM_REQ_RCVD:
2382 case IB_CM_MRA_REQ_SENT:
2383 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2384 cm_enter_timewait(cm_id_priv);
2385 else
2386 cm_reset_to_idle(cm_id_priv);
2387 break;
2388 case IB_CM_DREQ_SENT:
2389 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2390 /* fall through */
2391 case IB_CM_REP_RCVD:
2392 case IB_CM_MRA_REP_SENT:
2393 cm_enter_timewait(cm_id_priv);
2394 break;
2395 case IB_CM_ESTABLISHED:
2396 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
2397 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
2398 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
2399 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2400 cm_id_priv->msg);
2401 cm_enter_timewait(cm_id_priv);
2402 break;
2403 }
2404 /* fall through */
2405 default:
2406 spin_unlock_irq(&cm_id_priv->lock);
2407 ret = -EINVAL;
2408 goto out;
2409 }
2410
2411 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2412 if (!ret)
2413 list_add_tail(&work->list, &cm_id_priv->work_list);
2414 spin_unlock_irq(&cm_id_priv->lock);
2415
2416 if (ret)
2417 cm_process_work(cm_id_priv, work);
2418 else
2419 cm_deref_id(cm_id_priv);
2420 return 0;
2421 out:
2422 cm_deref_id(cm_id_priv);
2423 return -EINVAL;
2424 }
2425
2426 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2427 u8 service_timeout,
2428 const void *private_data,
2429 u8 private_data_len)
2430 {
2431 struct cm_id_private *cm_id_priv;
2432 struct ib_mad_send_buf *msg;
2433 enum ib_cm_state cm_state;
2434 enum ib_cm_lap_state lap_state;
2435 enum cm_msg_response msg_response;
2436 void *data;
2437 unsigned long flags;
2438 int ret;
2439
2440 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2441 return -EINVAL;
2442
2443 data = cm_copy_private_data(private_data, private_data_len);
2444 if (IS_ERR(data))
2445 return PTR_ERR(data);
2446
2447 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2448
2449 spin_lock_irqsave(&cm_id_priv->lock, flags);
2450 switch(cm_id_priv->id.state) {
2451 case IB_CM_REQ_RCVD:
2452 cm_state = IB_CM_MRA_REQ_SENT;
2453 lap_state = cm_id->lap_state;
2454 msg_response = CM_MSG_RESPONSE_REQ;
2455 break;
2456 case IB_CM_REP_RCVD:
2457 cm_state = IB_CM_MRA_REP_SENT;
2458 lap_state = cm_id->lap_state;
2459 msg_response = CM_MSG_RESPONSE_REP;
2460 break;
2461 case IB_CM_ESTABLISHED:
2462 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
2463 cm_state = cm_id->state;
2464 lap_state = IB_CM_MRA_LAP_SENT;
2465 msg_response = CM_MSG_RESPONSE_OTHER;
2466 break;
2467 }
2468 default:
2469 ret = -EINVAL;
2470 goto error1;
2471 }
2472
2473 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
2474 ret = cm_alloc_msg(cm_id_priv, &msg);
2475 if (ret)
2476 goto error1;
2477
2478 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2479 msg_response, service_timeout,
2480 private_data, private_data_len);
2481 ret = ib_post_send_mad(msg, NULL);
2482 if (ret)
2483 goto error2;
2484 }
2485
2486 cm_id->state = cm_state;
2487 cm_id->lap_state = lap_state;
2488 cm_id_priv->service_timeout = service_timeout;
2489 cm_set_private_data(cm_id_priv, data, private_data_len);
2490 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2491 return 0;
2492
2493 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2494 kfree(data);
2495 return ret;
2496
2497 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2498 kfree(data);
2499 cm_free_msg(msg);
2500 return ret;
2501 }
2502 EXPORT_SYMBOL(ib_send_cm_mra);
2503
2504 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2505 {
2506 switch (cm_mra_get_msg_mraed(mra_msg)) {
2507 case CM_MSG_RESPONSE_REQ:
2508 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2509 case CM_MSG_RESPONSE_REP:
2510 case CM_MSG_RESPONSE_OTHER:
2511 return cm_acquire_id(mra_msg->remote_comm_id,
2512 mra_msg->local_comm_id);
2513 default:
2514 return NULL;
2515 }
2516 }
2517
2518 static int cm_mra_handler(struct cm_work *work)
2519 {
2520 struct cm_id_private *cm_id_priv;
2521 struct cm_mra_msg *mra_msg;
2522 int timeout, ret;
2523
2524 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2525 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2526 if (!cm_id_priv)
2527 return -EINVAL;
2528
2529 work->cm_event.private_data = &mra_msg->private_data;
2530 work->cm_event.param.mra_rcvd.service_timeout =
2531 cm_mra_get_service_timeout(mra_msg);
2532 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2533 cm_convert_to_ms(cm_id_priv->av.timeout);
2534
2535 spin_lock_irq(&cm_id_priv->lock);
2536 switch (cm_id_priv->id.state) {
2537 case IB_CM_REQ_SENT:
2538 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2539 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2540 cm_id_priv->msg, timeout))
2541 goto out;
2542 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2543 break;
2544 case IB_CM_REP_SENT:
2545 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2546 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2547 cm_id_priv->msg, timeout))
2548 goto out;
2549 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2550 break;
2551 case IB_CM_ESTABLISHED:
2552 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2553 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2554 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2555 cm_id_priv->msg, timeout)) {
2556 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2557 atomic_long_inc(&work->port->
2558 counter_group[CM_RECV_DUPLICATES].
2559 counter[CM_MRA_COUNTER]);
2560 goto out;
2561 }
2562 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2563 break;
2564 case IB_CM_MRA_REQ_RCVD:
2565 case IB_CM_MRA_REP_RCVD:
2566 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2567 counter[CM_MRA_COUNTER]);
2568 /* fall through */
2569 default:
2570 goto out;
2571 }
2572
2573 cm_id_priv->msg->context[1] = (void *) (unsigned long)
2574 cm_id_priv->id.state;
2575 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2576 if (!ret)
2577 list_add_tail(&work->list, &cm_id_priv->work_list);
2578 spin_unlock_irq(&cm_id_priv->lock);
2579
2580 if (ret)
2581 cm_process_work(cm_id_priv, work);
2582 else
2583 cm_deref_id(cm_id_priv);
2584 return 0;
2585 out:
2586 spin_unlock_irq(&cm_id_priv->lock);
2587 cm_deref_id(cm_id_priv);
2588 return -EINVAL;
2589 }
2590
2591 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2592 struct cm_id_private *cm_id_priv,
2593 struct ib_sa_path_rec *alternate_path,
2594 const void *private_data,
2595 u8 private_data_len)
2596 {
2597 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2598 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2599 lap_msg->local_comm_id = cm_id_priv->id.local_id;
2600 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2601 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2602 /* todo: need remote CM response timeout */
2603 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2604 lap_msg->alt_local_lid = alternate_path->slid;
2605 lap_msg->alt_remote_lid = alternate_path->dlid;
2606 lap_msg->alt_local_gid = alternate_path->sgid;
2607 lap_msg->alt_remote_gid = alternate_path->dgid;
2608 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2609 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2610 lap_msg->alt_hop_limit = alternate_path->hop_limit;
2611 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2612 cm_lap_set_sl(lap_msg, alternate_path->sl);
2613 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2614 cm_lap_set_local_ack_timeout(lap_msg,
2615 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
2616 alternate_path->packet_life_time));
2617
2618 if (private_data && private_data_len)
2619 memcpy(lap_msg->private_data, private_data, private_data_len);
2620 }
2621
2622 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2623 struct ib_sa_path_rec *alternate_path,
2624 const void *private_data,
2625 u8 private_data_len)
2626 {
2627 struct cm_id_private *cm_id_priv;
2628 struct ib_mad_send_buf *msg;
2629 unsigned long flags;
2630 int ret;
2631
2632 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2633 return -EINVAL;
2634
2635 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2636 spin_lock_irqsave(&cm_id_priv->lock, flags);
2637 if (cm_id->state != IB_CM_ESTABLISHED ||
2638 (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2639 cm_id->lap_state != IB_CM_LAP_IDLE)) {
2640 ret = -EINVAL;
2641 goto out;
2642 }
2643
2644 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
2645 if (ret)
2646 goto out;
2647 cm_id_priv->alt_av.timeout =
2648 cm_ack_timeout(cm_id_priv->target_ack_delay,
2649 cm_id_priv->alt_av.timeout - 1);
2650
2651 ret = cm_alloc_msg(cm_id_priv, &msg);
2652 if (ret)
2653 goto out;
2654
2655 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2656 alternate_path, private_data, private_data_len);
2657 msg->timeout_ms = cm_id_priv->timeout_ms;
2658 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2659
2660 ret = ib_post_send_mad(msg, NULL);
2661 if (ret) {
2662 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2663 cm_free_msg(msg);
2664 return ret;
2665 }
2666
2667 cm_id->lap_state = IB_CM_LAP_SENT;
2668 cm_id_priv->msg = msg;
2669
2670 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2671 return ret;
2672 }
2673 EXPORT_SYMBOL(ib_send_cm_lap);
2674
2675 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2676 struct ib_sa_path_rec *path,
2677 struct cm_lap_msg *lap_msg)
2678 {
2679 memset(path, 0, sizeof *path);
2680 path->dgid = lap_msg->alt_local_gid;
2681 path->sgid = lap_msg->alt_remote_gid;
2682 path->dlid = lap_msg->alt_local_lid;
2683 path->slid = lap_msg->alt_remote_lid;
2684 path->flow_label = cm_lap_get_flow_label(lap_msg);
2685 path->hop_limit = lap_msg->alt_hop_limit;
2686 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2687 path->reversible = 1;
2688 path->pkey = cm_id_priv->pkey;
2689 path->sl = cm_lap_get_sl(lap_msg);
2690 path->mtu_selector = IB_SA_EQ;
2691 path->mtu = cm_id_priv->path_mtu;
2692 path->rate_selector = IB_SA_EQ;
2693 path->rate = cm_lap_get_packet_rate(lap_msg);
2694 path->packet_life_time_selector = IB_SA_EQ;
2695 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2696 path->packet_life_time -= (path->packet_life_time > 0);
2697 }
2698
2699 static int cm_lap_handler(struct cm_work *work)
2700 {
2701 struct cm_id_private *cm_id_priv;
2702 struct cm_lap_msg *lap_msg;
2703 struct ib_cm_lap_event_param *param;
2704 struct ib_mad_send_buf *msg = NULL;
2705 int ret;
2706
2707 /* todo: verify LAP request and send reject APR if invalid. */
2708 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2709 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2710 lap_msg->local_comm_id);
2711 if (!cm_id_priv)
2712 return -EINVAL;
2713
2714 param = &work->cm_event.param.lap_rcvd;
2715 param->alternate_path = &work->path[0];
2716 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
2717 work->cm_event.private_data = &lap_msg->private_data;
2718
2719 spin_lock_irq(&cm_id_priv->lock);
2720 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2721 goto unlock;
2722
2723 switch (cm_id_priv->id.lap_state) {
2724 case IB_CM_LAP_UNINIT:
2725 case IB_CM_LAP_IDLE:
2726 break;
2727 case IB_CM_MRA_LAP_SENT:
2728 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2729 counter[CM_LAP_COUNTER]);
2730 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2731 goto unlock;
2732
2733 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2734 CM_MSG_RESPONSE_OTHER,
2735 cm_id_priv->service_timeout,
2736 cm_id_priv->private_data,
2737 cm_id_priv->private_data_len);
2738 spin_unlock_irq(&cm_id_priv->lock);
2739
2740 if (ib_post_send_mad(msg, NULL))
2741 cm_free_msg(msg);
2742 goto deref;
2743 case IB_CM_LAP_RCVD:
2744 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2745 counter[CM_LAP_COUNTER]);
2746 goto unlock;
2747 default:
2748 goto unlock;
2749 }
2750
2751 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2752 cm_id_priv->tid = lap_msg->hdr.tid;
2753 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2754 work->mad_recv_wc->recv_buf.grh,
2755 &cm_id_priv->av);
2756 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
2757 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2758 if (!ret)
2759 list_add_tail(&work->list, &cm_id_priv->work_list);
2760 spin_unlock_irq(&cm_id_priv->lock);
2761
2762 if (ret)
2763 cm_process_work(cm_id_priv, work);
2764 else
2765 cm_deref_id(cm_id_priv);
2766 return 0;
2767
2768 unlock: spin_unlock_irq(&cm_id_priv->lock);
2769 deref: cm_deref_id(cm_id_priv);
2770 return -EINVAL;
2771 }
2772
2773 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2774 struct cm_id_private *cm_id_priv,
2775 enum ib_cm_apr_status status,
2776 void *info,
2777 u8 info_length,
2778 const void *private_data,
2779 u8 private_data_len)
2780 {
2781 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2782 apr_msg->local_comm_id = cm_id_priv->id.local_id;
2783 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2784 apr_msg->ap_status = (u8) status;
2785
2786 if (info && info_length) {
2787 apr_msg->info_length = info_length;
2788 memcpy(apr_msg->info, info, info_length);
2789 }
2790
2791 if (private_data && private_data_len)
2792 memcpy(apr_msg->private_data, private_data, private_data_len);
2793 }
2794
2795 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2796 enum ib_cm_apr_status status,
2797 void *info,
2798 u8 info_length,
2799 const void *private_data,
2800 u8 private_data_len)
2801 {
2802 struct cm_id_private *cm_id_priv;
2803 struct ib_mad_send_buf *msg;
2804 unsigned long flags;
2805 int ret;
2806
2807 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2808 (info && info_length > IB_CM_APR_INFO_LENGTH))
2809 return -EINVAL;
2810
2811 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2812 spin_lock_irqsave(&cm_id_priv->lock, flags);
2813 if (cm_id->state != IB_CM_ESTABLISHED ||
2814 (cm_id->lap_state != IB_CM_LAP_RCVD &&
2815 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2816 ret = -EINVAL;
2817 goto out;
2818 }
2819
2820 ret = cm_alloc_msg(cm_id_priv, &msg);
2821 if (ret)
2822 goto out;
2823
2824 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2825 info, info_length, private_data, private_data_len);
2826 ret = ib_post_send_mad(msg, NULL);
2827 if (ret) {
2828 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2829 cm_free_msg(msg);
2830 return ret;
2831 }
2832
2833 cm_id->lap_state = IB_CM_LAP_IDLE;
2834 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2835 return ret;
2836 }
2837 EXPORT_SYMBOL(ib_send_cm_apr);
2838
2839 static int cm_apr_handler(struct cm_work *work)
2840 {
2841 struct cm_id_private *cm_id_priv;
2842 struct cm_apr_msg *apr_msg;
2843 int ret;
2844
2845 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2846 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2847 apr_msg->local_comm_id);
2848 if (!cm_id_priv)
2849 return -EINVAL; /* Unmatched reply. */
2850
2851 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2852 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2853 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2854 work->cm_event.private_data = &apr_msg->private_data;
2855
2856 spin_lock_irq(&cm_id_priv->lock);
2857 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2858 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2859 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2860 spin_unlock_irq(&cm_id_priv->lock);
2861 goto out;
2862 }
2863 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2864 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2865 cm_id_priv->msg = NULL;
2866
2867 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2868 if (!ret)
2869 list_add_tail(&work->list, &cm_id_priv->work_list);
2870 spin_unlock_irq(&cm_id_priv->lock);
2871
2872 if (ret)
2873 cm_process_work(cm_id_priv, work);
2874 else
2875 cm_deref_id(cm_id_priv);
2876 return 0;
2877 out:
2878 cm_deref_id(cm_id_priv);
2879 return -EINVAL;
2880 }
2881
2882 static int cm_timewait_handler(struct cm_work *work)
2883 {
2884 struct cm_timewait_info *timewait_info;
2885 struct cm_id_private *cm_id_priv;
2886 int ret;
2887
2888 timewait_info = (struct cm_timewait_info *)work;
2889 spin_lock_irq(&cm.lock);
2890 list_del(&timewait_info->list);
2891 spin_unlock_irq(&cm.lock);
2892
2893 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2894 timewait_info->work.remote_id);
2895 if (!cm_id_priv)
2896 return -EINVAL;
2897
2898 spin_lock_irq(&cm_id_priv->lock);
2899 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2900 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2901 spin_unlock_irq(&cm_id_priv->lock);
2902 goto out;
2903 }
2904 cm_id_priv->id.state = IB_CM_IDLE;
2905 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2906 if (!ret)
2907 list_add_tail(&work->list, &cm_id_priv->work_list);
2908 spin_unlock_irq(&cm_id_priv->lock);
2909
2910 if (ret)
2911 cm_process_work(cm_id_priv, work);
2912 else
2913 cm_deref_id(cm_id_priv);
2914 return 0;
2915 out:
2916 cm_deref_id(cm_id_priv);
2917 return -EINVAL;
2918 }
2919
2920 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2921 struct cm_id_private *cm_id_priv,
2922 struct ib_cm_sidr_req_param *param)
2923 {
2924 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2925 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2926 sidr_req_msg->request_id = cm_id_priv->id.local_id;
2927 sidr_req_msg->pkey = param->path->pkey;
2928 sidr_req_msg->service_id = param->service_id;
2929
2930 if (param->private_data && param->private_data_len)
2931 memcpy(sidr_req_msg->private_data, param->private_data,
2932 param->private_data_len);
2933 }
2934
2935 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2936 struct ib_cm_sidr_req_param *param)
2937 {
2938 struct cm_id_private *cm_id_priv;
2939 struct ib_mad_send_buf *msg;
2940 unsigned long flags;
2941 int ret;
2942
2943 if (!param->path || (param->private_data &&
2944 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2945 return -EINVAL;
2946
2947 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2948 ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2949 if (ret)
2950 goto out;
2951
2952 cm_id->service_id = param->service_id;
2953 cm_id->service_mask = ~cpu_to_be64(0);
2954 cm_id_priv->timeout_ms = param->timeout_ms;
2955 cm_id_priv->max_cm_retries = param->max_cm_retries;
2956 ret = cm_alloc_msg(cm_id_priv, &msg);
2957 if (ret)
2958 goto out;
2959
2960 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2961 param);
2962 msg->timeout_ms = cm_id_priv->timeout_ms;
2963 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2964
2965 spin_lock_irqsave(&cm_id_priv->lock, flags);
2966 if (cm_id->state == IB_CM_IDLE)
2967 ret = ib_post_send_mad(msg, NULL);
2968 else
2969 ret = -EINVAL;
2970
2971 if (ret) {
2972 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2973 cm_free_msg(msg);
2974 goto out;
2975 }
2976 cm_id->state = IB_CM_SIDR_REQ_SENT;
2977 cm_id_priv->msg = msg;
2978 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2979 out:
2980 return ret;
2981 }
2982 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2983
2984 static void cm_format_sidr_req_event(struct cm_work *work,
2985 struct ib_cm_id *listen_id)
2986 {
2987 struct cm_sidr_req_msg *sidr_req_msg;
2988 struct ib_cm_sidr_req_event_param *param;
2989
2990 sidr_req_msg = (struct cm_sidr_req_msg *)
2991 work->mad_recv_wc->recv_buf.mad;
2992 param = &work->cm_event.param.sidr_req_rcvd;
2993 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2994 param->listen_id = listen_id;
2995 param->port = work->port->port_num;
2996 work->cm_event.private_data = &sidr_req_msg->private_data;
2997 }
2998
2999 static int cm_sidr_req_handler(struct cm_work *work)
3000 {
3001 struct ib_cm_id *cm_id;
3002 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
3003 struct cm_sidr_req_msg *sidr_req_msg;
3004 struct ib_wc *wc;
3005
3006 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
3007 if (IS_ERR(cm_id))
3008 return PTR_ERR(cm_id);
3009 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3010
3011 /* Record SGID/SLID and request ID for lookup. */
3012 sidr_req_msg = (struct cm_sidr_req_msg *)
3013 work->mad_recv_wc->recv_buf.mad;
3014 wc = work->mad_recv_wc->wc;
3015 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
3016 cm_id_priv->av.dgid.global.interface_id = 0;
3017 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
3018 work->mad_recv_wc->recv_buf.grh,
3019 &cm_id_priv->av);
3020 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
3021 cm_id_priv->tid = sidr_req_msg->hdr.tid;
3022 atomic_inc(&cm_id_priv->work_count);
3023
3024 spin_lock_irq(&cm.lock);
3025 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3026 if (cur_cm_id_priv) {
3027 spin_unlock_irq(&cm.lock);
3028 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3029 counter[CM_SIDR_REQ_COUNTER]);
3030 goto out; /* Duplicate message. */
3031 }
3032 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3033 cur_cm_id_priv = cm_find_listen(cm_id->device,
3034 sidr_req_msg->service_id,
3035 sidr_req_msg->private_data);
3036 if (!cur_cm_id_priv) {
3037 spin_unlock_irq(&cm.lock);
3038 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED);
3039 goto out; /* No match. */
3040 }
3041 atomic_inc(&cur_cm_id_priv->refcount);
3042 atomic_inc(&cm_id_priv->refcount);
3043 spin_unlock_irq(&cm.lock);
3044
3045 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
3046 cm_id_priv->id.context = cur_cm_id_priv->id.context;
3047 cm_id_priv->id.service_id = sidr_req_msg->service_id;
3048 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3049
3050 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
3051 cm_process_work(cm_id_priv, work);
3052 cm_deref_id(cur_cm_id_priv);
3053 return 0;
3054 out:
3055 ib_destroy_cm_id(&cm_id_priv->id);
3056 return -EINVAL;
3057 }
3058
3059 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3060 struct cm_id_private *cm_id_priv,
3061 struct ib_cm_sidr_rep_param *param)
3062 {
3063 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3064 cm_id_priv->tid);
3065 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
3066 sidr_rep_msg->status = param->status;
3067 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
3068 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
3069 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
3070
3071 if (param->info && param->info_length)
3072 memcpy(sidr_rep_msg->info, param->info, param->info_length);
3073
3074 if (param->private_data && param->private_data_len)
3075 memcpy(sidr_rep_msg->private_data, param->private_data,
3076 param->private_data_len);
3077 }
3078
3079 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3080 struct ib_cm_sidr_rep_param *param)
3081 {
3082 struct cm_id_private *cm_id_priv;
3083 struct ib_mad_send_buf *msg;
3084 unsigned long flags;
3085 int ret;
3086
3087 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3088 (param->private_data &&
3089 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3090 return -EINVAL;
3091
3092 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3093 spin_lock_irqsave(&cm_id_priv->lock, flags);
3094 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
3095 ret = -EINVAL;
3096 goto error;
3097 }
3098
3099 ret = cm_alloc_msg(cm_id_priv, &msg);
3100 if (ret)
3101 goto error;
3102
3103 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3104 param);
3105 ret = ib_post_send_mad(msg, NULL);
3106 if (ret) {
3107 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3108 cm_free_msg(msg);
3109 return ret;
3110 }
3111 cm_id->state = IB_CM_IDLE;
3112 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3113
3114 spin_lock_irqsave(&cm.lock, flags);
3115 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3116 spin_unlock_irqrestore(&cm.lock, flags);
3117 return 0;
3118
3119 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3120 return ret;
3121 }
3122 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3123
3124 static void cm_format_sidr_rep_event(struct cm_work *work)
3125 {
3126 struct cm_sidr_rep_msg *sidr_rep_msg;
3127 struct ib_cm_sidr_rep_event_param *param;
3128
3129 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3130 work->mad_recv_wc->recv_buf.mad;
3131 param = &work->cm_event.param.sidr_rep_rcvd;
3132 param->status = sidr_rep_msg->status;
3133 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
3134 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
3135 param->info = &sidr_rep_msg->info;
3136 param->info_len = sidr_rep_msg->info_length;
3137 work->cm_event.private_data = &sidr_rep_msg->private_data;
3138 }
3139
3140 static int cm_sidr_rep_handler(struct cm_work *work)
3141 {
3142 struct cm_sidr_rep_msg *sidr_rep_msg;
3143 struct cm_id_private *cm_id_priv;
3144
3145 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3146 work->mad_recv_wc->recv_buf.mad;
3147 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
3148 if (!cm_id_priv)
3149 return -EINVAL; /* Unmatched reply. */
3150
3151 spin_lock_irq(&cm_id_priv->lock);
3152 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3153 spin_unlock_irq(&cm_id_priv->lock);
3154 goto out;
3155 }
3156 cm_id_priv->id.state = IB_CM_IDLE;
3157 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3158 spin_unlock_irq(&cm_id_priv->lock);
3159
3160 cm_format_sidr_rep_event(work);
3161 cm_process_work(cm_id_priv, work);
3162 return 0;
3163 out:
3164 cm_deref_id(cm_id_priv);
3165 return -EINVAL;
3166 }
3167
3168 static void cm_process_send_error(struct ib_mad_send_buf *msg,
3169 enum ib_wc_status wc_status)
3170 {
3171 struct cm_id_private *cm_id_priv;
3172 struct ib_cm_event cm_event;
3173 enum ib_cm_state state;
3174 int ret;
3175
3176 memset(&cm_event, 0, sizeof cm_event);
3177 cm_id_priv = msg->context[0];
3178
3179 /* Discard old sends or ones without a response. */
3180 spin_lock_irq(&cm_id_priv->lock);
3181 state = (enum ib_cm_state) (unsigned long) msg->context[1];
3182 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3183 goto discard;
3184
3185 switch (state) {
3186 case IB_CM_REQ_SENT:
3187 case IB_CM_MRA_REQ_RCVD:
3188 cm_reset_to_idle(cm_id_priv);
3189 cm_event.event = IB_CM_REQ_ERROR;
3190 break;
3191 case IB_CM_REP_SENT:
3192 case IB_CM_MRA_REP_RCVD:
3193 cm_reset_to_idle(cm_id_priv);
3194 cm_event.event = IB_CM_REP_ERROR;
3195 break;
3196 case IB_CM_DREQ_SENT:
3197 cm_enter_timewait(cm_id_priv);
3198 cm_event.event = IB_CM_DREQ_ERROR;
3199 break;
3200 case IB_CM_SIDR_REQ_SENT:
3201 cm_id_priv->id.state = IB_CM_IDLE;
3202 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3203 break;
3204 default:
3205 goto discard;
3206 }
3207 spin_unlock_irq(&cm_id_priv->lock);
3208 cm_event.param.send_status = wc_status;
3209
3210 /* No other events can occur on the cm_id at this point. */
3211 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3212 cm_free_msg(msg);
3213 if (ret)
3214 ib_destroy_cm_id(&cm_id_priv->id);
3215 return;
3216 discard:
3217 spin_unlock_irq(&cm_id_priv->lock);
3218 cm_free_msg(msg);
3219 }
3220
3221 static void cm_send_handler(struct ib_mad_agent *mad_agent,
3222 struct ib_mad_send_wc *mad_send_wc)
3223 {
3224 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3225 struct cm_port *port;
3226 u16 attr_index;
3227
3228 port = mad_agent->context;
3229 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3230 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3231
3232 /*
3233 * If the send was in response to a received message (context[0] is not
3234 * set to a cm_id), and is not a REJ, then it is a send that was
3235 * manually retried.
3236 */
3237 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3238 msg->retries = 1;
3239
3240 atomic_long_add(1 + msg->retries,
3241 &port->counter_group[CM_XMIT].counter[attr_index]);
3242 if (msg->retries)
3243 atomic_long_add(msg->retries,
3244 &port->counter_group[CM_XMIT_RETRIES].
3245 counter[attr_index]);
3246
3247 switch (mad_send_wc->status) {
3248 case IB_WC_SUCCESS:
3249 case IB_WC_WR_FLUSH_ERR:
3250 cm_free_msg(msg);
3251 break;
3252 default:
3253 if (msg->context[0] && msg->context[1])
3254 cm_process_send_error(msg, mad_send_wc->status);
3255 else
3256 cm_free_msg(msg);
3257 break;
3258 }
3259 }
3260
3261 static void cm_work_handler(struct work_struct *_work)
3262 {
3263 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3264 int ret;
3265
3266 switch (work->cm_event.event) {
3267 case IB_CM_REQ_RECEIVED:
3268 ret = cm_req_handler(work);
3269 break;
3270 case IB_CM_MRA_RECEIVED:
3271 ret = cm_mra_handler(work);
3272 break;
3273 case IB_CM_REJ_RECEIVED:
3274 ret = cm_rej_handler(work);
3275 break;
3276 case IB_CM_REP_RECEIVED:
3277 ret = cm_rep_handler(work);
3278 break;
3279 case IB_CM_RTU_RECEIVED:
3280 ret = cm_rtu_handler(work);
3281 break;
3282 case IB_CM_USER_ESTABLISHED:
3283 ret = cm_establish_handler(work);
3284 break;
3285 case IB_CM_DREQ_RECEIVED:
3286 ret = cm_dreq_handler(work);
3287 break;
3288 case IB_CM_DREP_RECEIVED:
3289 ret = cm_drep_handler(work);
3290 break;
3291 case IB_CM_SIDR_REQ_RECEIVED:
3292 ret = cm_sidr_req_handler(work);
3293 break;
3294 case IB_CM_SIDR_REP_RECEIVED:
3295 ret = cm_sidr_rep_handler(work);
3296 break;
3297 case IB_CM_LAP_RECEIVED:
3298 ret = cm_lap_handler(work);
3299 break;
3300 case IB_CM_APR_RECEIVED:
3301 ret = cm_apr_handler(work);
3302 break;
3303 case IB_CM_TIMEWAIT_EXIT:
3304 ret = cm_timewait_handler(work);
3305 break;
3306 default:
3307 ret = -EINVAL;
3308 break;
3309 }
3310 if (ret)
3311 cm_free_work(work);
3312 }
3313
3314 static int cm_establish(struct ib_cm_id *cm_id)
3315 {
3316 struct cm_id_private *cm_id_priv;
3317 struct cm_work *work;
3318 unsigned long flags;
3319 int ret = 0;
3320 struct cm_device *cm_dev;
3321
3322 cm_dev = ib_get_client_data(cm_id->device, &cm_client);
3323 if (!cm_dev)
3324 return -ENODEV;
3325
3326 work = kmalloc(sizeof *work, GFP_ATOMIC);
3327 if (!work)
3328 return -ENOMEM;
3329
3330 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3331 spin_lock_irqsave(&cm_id_priv->lock, flags);
3332 switch (cm_id->state)
3333 {
3334 case IB_CM_REP_SENT:
3335 case IB_CM_MRA_REP_RCVD:
3336 cm_id->state = IB_CM_ESTABLISHED;
3337 break;
3338 case IB_CM_ESTABLISHED:
3339 ret = -EISCONN;
3340 break;
3341 default:
3342 ret = -EINVAL;
3343 break;
3344 }
3345 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3346
3347 if (ret) {
3348 kfree(work);
3349 goto out;
3350 }
3351
3352 /*
3353 * The CM worker thread may try to destroy the cm_id before it
3354 * can execute this work item. To prevent potential deadlock,
3355 * we need to find the cm_id once we're in the context of the
3356 * worker thread, rather than holding a reference on it.
3357 */
3358 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3359 work->local_id = cm_id->local_id;
3360 work->remote_id = cm_id->remote_id;
3361 work->mad_recv_wc = NULL;
3362 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3363
3364 /* Check if the device started its remove_one */
3365 spin_lock_irq(&cm.lock);
3366 if (!cm_dev->going_down) {
3367 queue_delayed_work(cm.wq, &work->work, 0);
3368 } else {
3369 kfree(work);
3370 ret = -ENODEV;
3371 }
3372 spin_unlock_irq(&cm.lock);
3373
3374 out:
3375 return ret;
3376 }
3377
3378 static int cm_migrate(struct ib_cm_id *cm_id)
3379 {
3380 struct cm_id_private *cm_id_priv;
3381 unsigned long flags;
3382 int ret = 0;
3383
3384 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3385 spin_lock_irqsave(&cm_id_priv->lock, flags);
3386 if (cm_id->state == IB_CM_ESTABLISHED &&
3387 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3388 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3389 cm_id->lap_state = IB_CM_LAP_IDLE;
3390 cm_id_priv->av = cm_id_priv->alt_av;
3391 } else
3392 ret = -EINVAL;
3393 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3394
3395 return ret;
3396 }
3397
3398 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3399 {
3400 int ret;
3401
3402 switch (event) {
3403 case IB_EVENT_COMM_EST:
3404 ret = cm_establish(cm_id);
3405 break;
3406 case IB_EVENT_PATH_MIG:
3407 ret = cm_migrate(cm_id);
3408 break;
3409 default:
3410 ret = -EINVAL;
3411 }
3412 return ret;
3413 }
3414 EXPORT_SYMBOL(ib_cm_notify);
3415
3416 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3417 struct ib_mad_recv_wc *mad_recv_wc)
3418 {
3419 struct cm_port *port = mad_agent->context;
3420 struct cm_work *work;
3421 enum ib_cm_event_type event;
3422 u16 attr_id;
3423 int paths = 0;
3424 int going_down = 0;
3425
3426 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3427 case CM_REQ_ATTR_ID:
3428 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3429 alt_local_lid != 0);
3430 event = IB_CM_REQ_RECEIVED;
3431 break;
3432 case CM_MRA_ATTR_ID:
3433 event = IB_CM_MRA_RECEIVED;
3434 break;
3435 case CM_REJ_ATTR_ID:
3436 event = IB_CM_REJ_RECEIVED;
3437 break;
3438 case CM_REP_ATTR_ID:
3439 event = IB_CM_REP_RECEIVED;
3440 break;
3441 case CM_RTU_ATTR_ID:
3442 event = IB_CM_RTU_RECEIVED;
3443 break;
3444 case CM_DREQ_ATTR_ID:
3445 event = IB_CM_DREQ_RECEIVED;
3446 break;
3447 case CM_DREP_ATTR_ID:
3448 event = IB_CM_DREP_RECEIVED;
3449 break;
3450 case CM_SIDR_REQ_ATTR_ID:
3451 event = IB_CM_SIDR_REQ_RECEIVED;
3452 break;
3453 case CM_SIDR_REP_ATTR_ID:
3454 event = IB_CM_SIDR_REP_RECEIVED;
3455 break;
3456 case CM_LAP_ATTR_ID:
3457 paths = 1;
3458 event = IB_CM_LAP_RECEIVED;
3459 break;
3460 case CM_APR_ATTR_ID:
3461 event = IB_CM_APR_RECEIVED;
3462 break;
3463 default:
3464 ib_free_recv_mad(mad_recv_wc);
3465 return;
3466 }
3467
3468 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
3469 atomic_long_inc(&port->counter_group[CM_RECV].
3470 counter[attr_id - CM_ATTR_ID_OFFSET]);
3471
3472 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3473 GFP_KERNEL);
3474 if (!work) {
3475 ib_free_recv_mad(mad_recv_wc);
3476 return;
3477 }
3478
3479 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3480 work->cm_event.event = event;
3481 work->mad_recv_wc = mad_recv_wc;
3482 work->port = port;
3483
3484 /* Check if the device started its remove_one */
3485 spin_lock_irq(&cm.lock);
3486 if (!port->cm_dev->going_down)
3487 queue_delayed_work(cm.wq, &work->work, 0);
3488 else
3489 going_down = 1;
3490 spin_unlock_irq(&cm.lock);
3491
3492 if (going_down) {
3493 kfree(work);
3494 ib_free_recv_mad(mad_recv_wc);
3495 }
3496 }
3497
3498 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3499 struct ib_qp_attr *qp_attr,
3500 int *qp_attr_mask)
3501 {
3502 unsigned long flags;
3503 int ret;
3504
3505 spin_lock_irqsave(&cm_id_priv->lock, flags);
3506 switch (cm_id_priv->id.state) {
3507 case IB_CM_REQ_SENT:
3508 case IB_CM_MRA_REQ_RCVD:
3509 case IB_CM_REQ_RCVD:
3510 case IB_CM_MRA_REQ_SENT:
3511 case IB_CM_REP_RCVD:
3512 case IB_CM_MRA_REP_SENT:
3513 case IB_CM_REP_SENT:
3514 case IB_CM_MRA_REP_RCVD:
3515 case IB_CM_ESTABLISHED:
3516 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3517 IB_QP_PKEY_INDEX | IB_QP_PORT;
3518 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
3519 if (cm_id_priv->responder_resources)
3520 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3521 IB_ACCESS_REMOTE_ATOMIC;
3522 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3523 qp_attr->port_num = cm_id_priv->av.port->port_num;
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_rtr_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 case IB_CM_REQ_RCVD:
3544 case IB_CM_MRA_REQ_SENT:
3545 case IB_CM_REP_RCVD:
3546 case IB_CM_MRA_REP_SENT:
3547 case IB_CM_REP_SENT:
3548 case IB_CM_MRA_REP_RCVD:
3549 case IB_CM_ESTABLISHED:
3550 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3551 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3552 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3553 if (!cm_id_priv->av.valid) {
3554 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3555 return -EINVAL;
3556 }
3557 if (cm_id_priv->av.ah_attr.vlan_id != 0xffff) {
3558 qp_attr->vlan_id = cm_id_priv->av.ah_attr.vlan_id;
3559 *qp_attr_mask |= IB_QP_VID;
3560 }
3561 if (!is_zero_ether_addr(cm_id_priv->av.smac)) {
3562 memcpy(qp_attr->smac, cm_id_priv->av.smac,
3563 sizeof(qp_attr->smac));
3564 *qp_attr_mask |= IB_QP_SMAC;
3565 }
3566 if (cm_id_priv->alt_av.valid) {
3567 if (cm_id_priv->alt_av.ah_attr.vlan_id != 0xffff) {
3568 qp_attr->alt_vlan_id =
3569 cm_id_priv->alt_av.ah_attr.vlan_id;
3570 *qp_attr_mask |= IB_QP_ALT_VID;
3571 }
3572 if (!is_zero_ether_addr(cm_id_priv->alt_av.smac)) {
3573 memcpy(qp_attr->alt_smac,
3574 cm_id_priv->alt_av.smac,
3575 sizeof(qp_attr->alt_smac));
3576 *qp_attr_mask |= IB_QP_ALT_SMAC;
3577 }
3578 }
3579 qp_attr->path_mtu = cm_id_priv->path_mtu;
3580 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3581 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3582 if (cm_id_priv->qp_type == IB_QPT_RC ||
3583 cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
3584 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3585 IB_QP_MIN_RNR_TIMER;
3586 qp_attr->max_dest_rd_atomic =
3587 cm_id_priv->responder_resources;
3588 qp_attr->min_rnr_timer = 0;
3589 }
3590 if (cm_id_priv->alt_av.ah_attr.dlid) {
3591 *qp_attr_mask |= IB_QP_ALT_PATH;
3592 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3593 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3594 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3595 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3596 }
3597 ret = 0;
3598 break;
3599 default:
3600 ret = -EINVAL;
3601 break;
3602 }
3603 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3604 return ret;
3605 }
3606
3607 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3608 struct ib_qp_attr *qp_attr,
3609 int *qp_attr_mask)
3610 {
3611 unsigned long flags;
3612 int ret;
3613
3614 spin_lock_irqsave(&cm_id_priv->lock, flags);
3615 switch (cm_id_priv->id.state) {
3616 /* Allow transition to RTS before sending REP */
3617 case IB_CM_REQ_RCVD:
3618 case IB_CM_MRA_REQ_SENT:
3619
3620 case IB_CM_REP_RCVD:
3621 case IB_CM_MRA_REP_SENT:
3622 case IB_CM_REP_SENT:
3623 case IB_CM_MRA_REP_RCVD:
3624 case IB_CM_ESTABLISHED:
3625 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
3626 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3627 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3628 switch (cm_id_priv->qp_type) {
3629 case IB_QPT_RC:
3630 case IB_QPT_XRC_INI:
3631 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
3632 IB_QP_MAX_QP_RD_ATOMIC;
3633 qp_attr->retry_cnt = cm_id_priv->retry_count;
3634 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3635 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3636 /* fall through */
3637 case IB_QPT_XRC_TGT:
3638 *qp_attr_mask |= IB_QP_TIMEOUT;
3639 qp_attr->timeout = cm_id_priv->av.timeout;
3640 break;
3641 default:
3642 break;
3643 }
3644 if (cm_id_priv->alt_av.ah_attr.dlid) {
3645 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3646 qp_attr->path_mig_state = IB_MIG_REARM;
3647 }
3648 } else {
3649 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
3650 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3651 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3652 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3653 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3654 qp_attr->path_mig_state = IB_MIG_REARM;
3655 }
3656 ret = 0;
3657 break;
3658 default:
3659 ret = -EINVAL;
3660 break;
3661 }
3662 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3663 return ret;
3664 }
3665
3666 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3667 struct ib_qp_attr *qp_attr,
3668 int *qp_attr_mask)
3669 {
3670 struct cm_id_private *cm_id_priv;
3671 int ret;
3672
3673 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3674 switch (qp_attr->qp_state) {
3675 case IB_QPS_INIT:
3676 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3677 break;
3678 case IB_QPS_RTR:
3679 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3680 break;
3681 case IB_QPS_RTS:
3682 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3683 break;
3684 default:
3685 ret = -EINVAL;
3686 break;
3687 }
3688 return ret;
3689 }
3690 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3691
3692 static void cm_get_ack_delay(struct cm_device *cm_dev)
3693 {
3694 struct ib_device_attr attr;
3695
3696 if (ib_query_device(cm_dev->ib_device, &attr))
3697 cm_dev->ack_delay = 0; /* acks will rely on packet life time */
3698 else
3699 cm_dev->ack_delay = attr.local_ca_ack_delay;
3700 }
3701
3702 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
3703 char *buf)
3704 {
3705 struct cm_counter_group *group;
3706 struct cm_counter_attribute *cm_attr;
3707
3708 group = container_of(obj, struct cm_counter_group, obj);
3709 cm_attr = container_of(attr, struct cm_counter_attribute, attr);
3710
3711 return sprintf(buf, "%ld\n",
3712 atomic_long_read(&group->counter[cm_attr->index]));
3713 }
3714
3715 static const struct sysfs_ops cm_counter_ops = {
3716 .show = cm_show_counter
3717 };
3718
3719 static struct kobj_type cm_counter_obj_type = {
3720 .sysfs_ops = &cm_counter_ops,
3721 .default_attrs = cm_counter_default_attrs
3722 };
3723
3724 static void cm_release_port_obj(struct kobject *obj)
3725 {
3726 struct cm_port *cm_port;
3727
3728 cm_port = container_of(obj, struct cm_port, port_obj);
3729 kfree(cm_port);
3730 }
3731
3732 static struct kobj_type cm_port_obj_type = {
3733 .release = cm_release_port_obj
3734 };
3735
3736 static char *cm_devnode(struct device *dev, umode_t *mode)
3737 {
3738 if (mode)
3739 *mode = 0666;
3740 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
3741 }
3742
3743 struct class cm_class = {
3744 .owner = THIS_MODULE,
3745 .name = "infiniband_cm",
3746 .devnode = cm_devnode,
3747 };
3748 EXPORT_SYMBOL(cm_class);
3749
3750 static int cm_create_port_fs(struct cm_port *port)
3751 {
3752 int i, ret;
3753
3754 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type,
3755 &port->cm_dev->device->kobj,
3756 "%d", port->port_num);
3757 if (ret) {
3758 kfree(port);
3759 return ret;
3760 }
3761
3762 for (i = 0; i < CM_COUNTER_GROUPS; i++) {
3763 ret = kobject_init_and_add(&port->counter_group[i].obj,
3764 &cm_counter_obj_type,
3765 &port->port_obj,
3766 "%s", counter_group_names[i]);
3767 if (ret)
3768 goto error;
3769 }
3770
3771 return 0;
3772
3773 error:
3774 while (i--)
3775 kobject_put(&port->counter_group[i].obj);
3776 kobject_put(&port->port_obj);
3777 return ret;
3778
3779 }
3780
3781 static void cm_remove_port_fs(struct cm_port *port)
3782 {
3783 int i;
3784
3785 for (i = 0; i < CM_COUNTER_GROUPS; i++)
3786 kobject_put(&port->counter_group[i].obj);
3787
3788 kobject_put(&port->port_obj);
3789 }
3790
3791 static void cm_add_one(struct ib_device *ib_device)
3792 {
3793 struct cm_device *cm_dev;
3794 struct cm_port *port;
3795 struct ib_mad_reg_req reg_req = {
3796 .mgmt_class = IB_MGMT_CLASS_CM,
3797 .mgmt_class_version = IB_CM_CLASS_VERSION,
3798 };
3799 struct ib_port_modify port_modify = {
3800 .set_port_cap_mask = IB_PORT_CM_SUP
3801 };
3802 unsigned long flags;
3803 int ret;
3804 int count = 0;
3805 u8 i;
3806
3807 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) *
3808 ib_device->phys_port_cnt, GFP_KERNEL);
3809 if (!cm_dev)
3810 return;
3811
3812 cm_dev->ib_device = ib_device;
3813 cm_get_ack_delay(cm_dev);
3814 cm_dev->going_down = 0;
3815 cm_dev->device = device_create(&cm_class, &ib_device->dev,
3816 MKDEV(0, 0), NULL,
3817 "%s", ib_device->name);
3818 if (IS_ERR(cm_dev->device)) {
3819 kfree(cm_dev);
3820 return;
3821 }
3822
3823 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3824 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3825 if (!rdma_cap_ib_cm(ib_device, i))
3826 continue;
3827
3828 port = kzalloc(sizeof *port, GFP_KERNEL);
3829 if (!port)
3830 goto error1;
3831
3832 cm_dev->port[i-1] = port;
3833 port->cm_dev = cm_dev;
3834 port->port_num = i;
3835
3836 ret = cm_create_port_fs(port);
3837 if (ret)
3838 goto error1;
3839
3840 port->mad_agent = ib_register_mad_agent(ib_device, i,
3841 IB_QPT_GSI,
3842 &reg_req,
3843 0,
3844 cm_send_handler,
3845 cm_recv_handler,
3846 port,
3847 0);
3848 if (IS_ERR(port->mad_agent))
3849 goto error2;
3850
3851 ret = ib_modify_port(ib_device, i, 0, &port_modify);
3852 if (ret)
3853 goto error3;
3854
3855 count++;
3856 }
3857
3858 if (!count)
3859 goto free;
3860
3861 ib_set_client_data(ib_device, &cm_client, cm_dev);
3862
3863 write_lock_irqsave(&cm.device_lock, flags);
3864 list_add_tail(&cm_dev->list, &cm.device_list);
3865 write_unlock_irqrestore(&cm.device_lock, flags);
3866 return;
3867
3868 error3:
3869 ib_unregister_mad_agent(port->mad_agent);
3870 error2:
3871 cm_remove_port_fs(port);
3872 error1:
3873 port_modify.set_port_cap_mask = 0;
3874 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3875 while (--i) {
3876 if (!rdma_cap_ib_cm(ib_device, i))
3877 continue;
3878
3879 port = cm_dev->port[i-1];
3880 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3881 ib_unregister_mad_agent(port->mad_agent);
3882 cm_remove_port_fs(port);
3883 }
3884 free:
3885 device_unregister(cm_dev->device);
3886 kfree(cm_dev);
3887 }
3888
3889 static void cm_remove_one(struct ib_device *ib_device)
3890 {
3891 struct cm_device *cm_dev;
3892 struct cm_port *port;
3893 struct ib_port_modify port_modify = {
3894 .clr_port_cap_mask = IB_PORT_CM_SUP
3895 };
3896 unsigned long flags;
3897 int i;
3898
3899 cm_dev = ib_get_client_data(ib_device, &cm_client);
3900 if (!cm_dev)
3901 return;
3902
3903 write_lock_irqsave(&cm.device_lock, flags);
3904 list_del(&cm_dev->list);
3905 write_unlock_irqrestore(&cm.device_lock, flags);
3906
3907 spin_lock_irq(&cm.lock);
3908 cm_dev->going_down = 1;
3909 spin_unlock_irq(&cm.lock);
3910
3911 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3912 if (!rdma_cap_ib_cm(ib_device, i))
3913 continue;
3914
3915 port = cm_dev->port[i-1];
3916 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3917 /*
3918 * We flush the queue here after the going_down set, this
3919 * verify that no new works will be queued in the recv handler,
3920 * after that we can call the unregister_mad_agent
3921 */
3922 flush_workqueue(cm.wq);
3923 ib_unregister_mad_agent(port->mad_agent);
3924 cm_remove_port_fs(port);
3925 }
3926 device_unregister(cm_dev->device);
3927 kfree(cm_dev);
3928 }
3929
3930 static int __init ib_cm_init(void)
3931 {
3932 int ret;
3933
3934 memset(&cm, 0, sizeof cm);
3935 INIT_LIST_HEAD(&cm.device_list);
3936 rwlock_init(&cm.device_lock);
3937 spin_lock_init(&cm.lock);
3938 cm.listen_service_table = RB_ROOT;
3939 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3940 cm.remote_id_table = RB_ROOT;
3941 cm.remote_qp_table = RB_ROOT;
3942 cm.remote_sidr_table = RB_ROOT;
3943 idr_init(&cm.local_id_table);
3944 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3945 INIT_LIST_HEAD(&cm.timewait_list);
3946
3947 ret = class_register(&cm_class);
3948 if (ret) {
3949 ret = -ENOMEM;
3950 goto error1;
3951 }
3952
3953 cm.wq = create_workqueue("ib_cm");
3954 if (!cm.wq) {
3955 ret = -ENOMEM;
3956 goto error2;
3957 }
3958
3959 ret = ib_register_client(&cm_client);
3960 if (ret)
3961 goto error3;
3962
3963 return 0;
3964 error3:
3965 destroy_workqueue(cm.wq);
3966 error2:
3967 class_unregister(&cm_class);
3968 error1:
3969 idr_destroy(&cm.local_id_table);
3970 return ret;
3971 }
3972
3973 static void __exit ib_cm_cleanup(void)
3974 {
3975 struct cm_timewait_info *timewait_info, *tmp;
3976
3977 spin_lock_irq(&cm.lock);
3978 list_for_each_entry(timewait_info, &cm.timewait_list, list)
3979 cancel_delayed_work(&timewait_info->work.work);
3980 spin_unlock_irq(&cm.lock);
3981
3982 ib_unregister_client(&cm_client);
3983 destroy_workqueue(cm.wq);
3984
3985 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
3986 list_del(&timewait_info->list);
3987 kfree(timewait_info);
3988 }
3989
3990 class_unregister(&cm_class);
3991 idr_destroy(&cm.local_id_table);
3992 }
3993
3994 module_init(ib_cm_init);
3995 module_exit(ib_cm_cleanup);
3996
Linux with added FPC-III support