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Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / infiniband / core / cm.c
blob8b72f39202fb01d7e7bc29d5af45b55b01c0387a
1 /*
2 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved.
3 * Copyright (c) 2004 Topspin Corporation. All rights reserved.
4 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved.
5 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 */
35
36 #include <linux/completion.h>
37 #include <linux/dma-mapping.h>
38 #include <linux/device.h>
39 #include <linux/module.h>
40 #include <linux/err.h>
41 #include <linux/idr.h>
42 #include <linux/interrupt.h>
43 #include <linux/random.h>
44 #include <linux/rbtree.h>
45 #include <linux/spinlock.h>
46 #include <linux/slab.h>
47 #include <linux/sysfs.h>
48 #include <linux/workqueue.h>
49 #include <linux/kdev_t.h>
50
51 #include <rdma/ib_cache.h>
52 #include <rdma/ib_cm.h>
53 #include "cm_msgs.h"
54
55 MODULE_AUTHOR("Sean Hefty");
56 MODULE_DESCRIPTION("InfiniBand CM");
57 MODULE_LICENSE("Dual BSD/GPL");
58
59 static void cm_add_one(struct ib_device *device);
60 static void cm_remove_one(struct ib_device *device);
61
62 static struct ib_client cm_client = {
63 .name = "cm",
64 .add = cm_add_one,
65 .remove = cm_remove_one
66 };
67
68 static struct ib_cm {
69 spinlock_t lock;
70 struct list_head device_list;
71 rwlock_t device_lock;
72 struct rb_root listen_service_table;
73 u64 listen_service_id;
74 /* struct rb_root peer_service_table; todo: fix peer to peer */
75 struct rb_root remote_qp_table;
76 struct rb_root remote_id_table;
77 struct rb_root remote_sidr_table;
78 struct idr local_id_table;
79 __be32 random_id_operand;
80 struct list_head timewait_list;
81 struct workqueue_struct *wq;
82 } cm;
83
84 /* Counter indexes ordered by attribute ID */
85 enum {
86 CM_REQ_COUNTER,
87 CM_MRA_COUNTER,
88 CM_REJ_COUNTER,
89 CM_REP_COUNTER,
90 CM_RTU_COUNTER,
91 CM_DREQ_COUNTER,
92 CM_DREP_COUNTER,
93 CM_SIDR_REQ_COUNTER,
94 CM_SIDR_REP_COUNTER,
95 CM_LAP_COUNTER,
96 CM_APR_COUNTER,
97 CM_ATTR_COUNT,
98 CM_ATTR_ID_OFFSET = 0x0010,
99 };
100
101 enum {
102 CM_XMIT,
103 CM_XMIT_RETRIES,
104 CM_RECV,
105 CM_RECV_DUPLICATES,
106 CM_COUNTER_GROUPS
107 };
108
109 static char const counter_group_names[CM_COUNTER_GROUPS]
110 [sizeof("cm_rx_duplicates")] = {
111 "cm_tx_msgs", "cm_tx_retries",
112 "cm_rx_msgs", "cm_rx_duplicates"
113 };
114
115 struct cm_counter_group {
116 struct kobject obj;
117 atomic_long_t counter[CM_ATTR_COUNT];
118 };
119
120 struct cm_counter_attribute {
121 struct attribute attr;
122 int index;
123 };
124
125 #define CM_COUNTER_ATTR(_name, _index) \
126 struct cm_counter_attribute cm_##_name##_counter_attr = { \
127 .attr = { .name = __stringify(_name), .mode = 0444 }, \
128 .index = _index \
129 }
130
131 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
132 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
133 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
134 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
135 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
136 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
137 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
138 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
139 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
140 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
141 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
142
143 static struct attribute *cm_counter_default_attrs[] = {
144 &cm_req_counter_attr.attr,
145 &cm_mra_counter_attr.attr,
146 &cm_rej_counter_attr.attr,
147 &cm_rep_counter_attr.attr,
148 &cm_rtu_counter_attr.attr,
149 &cm_dreq_counter_attr.attr,
150 &cm_drep_counter_attr.attr,
151 &cm_sidr_req_counter_attr.attr,
152 &cm_sidr_rep_counter_attr.attr,
153 &cm_lap_counter_attr.attr,
154 &cm_apr_counter_attr.attr,
155 NULL
156 };
157
158 struct cm_port {
159 struct cm_device *cm_dev;
160 struct ib_mad_agent *mad_agent;
161 struct kobject port_obj;
162 u8 port_num;
163 struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
164 };
165
166 struct cm_device {
167 struct list_head list;
168 struct ib_device *ib_device;
169 struct device *device;
170 u8 ack_delay;
171 struct cm_port *port[0];
172 };
173
174 struct cm_av {
175 struct cm_port *port;
176 union ib_gid dgid;
177 struct ib_ah_attr ah_attr;
178 u16 pkey_index;
179 u8 timeout;
180 };
181
182 struct cm_work {
183 struct delayed_work work;
184 struct list_head list;
185 struct cm_port *port;
186 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
187 __be32 local_id; /* Established / timewait */
188 __be32 remote_id;
189 struct ib_cm_event cm_event;
190 struct ib_sa_path_rec path[0];
191 };
192
193 struct cm_timewait_info {
194 struct cm_work work; /* Must be first. */
195 struct list_head list;
196 struct rb_node remote_qp_node;
197 struct rb_node remote_id_node;
198 __be64 remote_ca_guid;
199 __be32 remote_qpn;
200 u8 inserted_remote_qp;
201 u8 inserted_remote_id;
202 };
203
204 struct cm_id_private {
205 struct ib_cm_id id;
206
207 struct rb_node service_node;
208 struct rb_node sidr_id_node;
209 spinlock_t lock; /* Do not acquire inside cm.lock */
210 struct completion comp;
211 atomic_t refcount;
212
213 struct ib_mad_send_buf *msg;
214 struct cm_timewait_info *timewait_info;
215 /* todo: use alternate port on send failure */
216 struct cm_av av;
217 struct cm_av alt_av;
218 struct ib_cm_compare_data *compare_data;
219
220 void *private_data;
221 __be64 tid;
222 __be32 local_qpn;
223 __be32 remote_qpn;
224 enum ib_qp_type qp_type;
225 __be32 sq_psn;
226 __be32 rq_psn;
227 int timeout_ms;
228 enum ib_mtu path_mtu;
229 __be16 pkey;
230 u8 private_data_len;
231 u8 max_cm_retries;
232 u8 peer_to_peer;
233 u8 responder_resources;
234 u8 initiator_depth;
235 u8 retry_count;
236 u8 rnr_retry_count;
237 u8 service_timeout;
238 u8 target_ack_delay;
239
240 struct list_head work_list;
241 atomic_t work_count;
242 };
243
244 static void cm_work_handler(struct work_struct *work);
245
246 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
247 {
248 if (atomic_dec_and_test(&cm_id_priv->refcount))
249 complete(&cm_id_priv->comp);
250 }
251
252 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
253 struct ib_mad_send_buf **msg)
254 {
255 struct ib_mad_agent *mad_agent;
256 struct ib_mad_send_buf *m;
257 struct ib_ah *ah;
258
259 mad_agent = cm_id_priv->av.port->mad_agent;
260 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
261 if (IS_ERR(ah))
262 return PTR_ERR(ah);
263
264 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
265 cm_id_priv->av.pkey_index,
266 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
267 GFP_ATOMIC);
268 if (IS_ERR(m)) {
269 ib_destroy_ah(ah);
270 return PTR_ERR(m);
271 }
272
273 /* Timeout set by caller if response is expected. */
274 m->ah = ah;
275 m->retries = cm_id_priv->max_cm_retries;
276
277 atomic_inc(&cm_id_priv->refcount);
278 m->context[0] = cm_id_priv;
279 *msg = m;
280 return 0;
281 }
282
283 static int cm_alloc_response_msg(struct cm_port *port,
284 struct ib_mad_recv_wc *mad_recv_wc,
285 struct ib_mad_send_buf **msg)
286 {
287 struct ib_mad_send_buf *m;
288 struct ib_ah *ah;
289
290 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
291 mad_recv_wc->recv_buf.grh, port->port_num);
292 if (IS_ERR(ah))
293 return PTR_ERR(ah);
294
295 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
296 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
297 GFP_ATOMIC);
298 if (IS_ERR(m)) {
299 ib_destroy_ah(ah);
300 return PTR_ERR(m);
301 }
302 m->ah = ah;
303 *msg = m;
304 return 0;
305 }
306
307 static void cm_free_msg(struct ib_mad_send_buf *msg)
308 {
309 ib_destroy_ah(msg->ah);
310 if (msg->context[0])
311 cm_deref_id(msg->context[0]);
312 ib_free_send_mad(msg);
313 }
314
315 static void * cm_copy_private_data(const void *private_data,
316 u8 private_data_len)
317 {
318 void *data;
319
320 if (!private_data || !private_data_len)
321 return NULL;
322
323 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
324 if (!data)
325 return ERR_PTR(-ENOMEM);
326
327 return data;
328 }
329
330 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
331 void *private_data, u8 private_data_len)
332 {
333 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
334 kfree(cm_id_priv->private_data);
335
336 cm_id_priv->private_data = private_data;
337 cm_id_priv->private_data_len = private_data_len;
338 }
339
340 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
341 struct ib_grh *grh, struct cm_av *av)
342 {
343 av->port = port;
344 av->pkey_index = wc->pkey_index;
345 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc,
346 grh, &av->ah_attr);
347 }
348
349 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
350 {
351 struct cm_device *cm_dev;
352 struct cm_port *port = NULL;
353 unsigned long flags;
354 int ret;
355 u8 p;
356
357 read_lock_irqsave(&cm.device_lock, flags);
358 list_for_each_entry(cm_dev, &cm.device_list, list) {
359 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid,
360 &p, NULL)) {
361 port = cm_dev->port[p-1];
362 break;
363 }
364 }
365 read_unlock_irqrestore(&cm.device_lock, flags);
366
367 if (!port)
368 return -EINVAL;
369
370 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
371 be16_to_cpu(path->pkey), &av->pkey_index);
372 if (ret)
373 return ret;
374
375 av->port = port;
376 ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path,
377 &av->ah_attr);
378 av->timeout = path->packet_life_time + 1;
379 return 0;
380 }
381
382 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
383 {
384 unsigned long flags;
385 int ret, id;
386 static int next_id;
387
388 do {
389 spin_lock_irqsave(&cm.lock, flags);
390 ret = idr_get_new_above(&cm.local_id_table, cm_id_priv,
391 next_id, &id);
392 if (!ret)
393 next_id = ((unsigned) id + 1) & MAX_ID_MASK;
394 spin_unlock_irqrestore(&cm.lock, flags);
395 } while( (ret == -EAGAIN) && idr_pre_get(&cm.local_id_table, GFP_KERNEL) );
396
397 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
398 return ret;
399 }
400
401 static void cm_free_id(__be32 local_id)
402 {
403 spin_lock_irq(&cm.lock);
404 idr_remove(&cm.local_id_table,
405 (__force int) (local_id ^ cm.random_id_operand));
406 spin_unlock_irq(&cm.lock);
407 }
408
409 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
410 {
411 struct cm_id_private *cm_id_priv;
412
413 cm_id_priv = idr_find(&cm.local_id_table,
414 (__force int) (local_id ^ cm.random_id_operand));
415 if (cm_id_priv) {
416 if (cm_id_priv->id.remote_id == remote_id)
417 atomic_inc(&cm_id_priv->refcount);
418 else
419 cm_id_priv = NULL;
420 }
421
422 return cm_id_priv;
423 }
424
425 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
426 {
427 struct cm_id_private *cm_id_priv;
428
429 spin_lock_irq(&cm.lock);
430 cm_id_priv = cm_get_id(local_id, remote_id);
431 spin_unlock_irq(&cm.lock);
432
433 return cm_id_priv;
434 }
435
436 static void cm_mask_copy(u8 *dst, u8 *src, u8 *mask)
437 {
438 int i;
439
440 for (i = 0; i < IB_CM_COMPARE_SIZE / sizeof(unsigned long); i++)
441 ((unsigned long *) dst)[i] = ((unsigned long *) src)[i] &
442 ((unsigned long *) mask)[i];
443 }
444
445 static int cm_compare_data(struct ib_cm_compare_data *src_data,
446 struct ib_cm_compare_data *dst_data)
447 {
448 u8 src[IB_CM_COMPARE_SIZE];
449 u8 dst[IB_CM_COMPARE_SIZE];
450
451 if (!src_data || !dst_data)
452 return 0;
453
454 cm_mask_copy(src, src_data->data, dst_data->mask);
455 cm_mask_copy(dst, dst_data->data, src_data->mask);
456 return memcmp(src, dst, IB_CM_COMPARE_SIZE);
457 }
458
459 static int cm_compare_private_data(u8 *private_data,
460 struct ib_cm_compare_data *dst_data)
461 {
462 u8 src[IB_CM_COMPARE_SIZE];
463
464 if (!dst_data)
465 return 0;
466
467 cm_mask_copy(src, private_data, dst_data->mask);
468 return memcmp(src, dst_data->data, IB_CM_COMPARE_SIZE);
469 }
470
471 /*
472 * Trivial helpers to strip endian annotation and compare; the
473 * endianness doesn't actually matter since we just need a stable
474 * order for the RB tree.
475 */
476 static int be32_lt(__be32 a, __be32 b)
477 {
478 return (__force u32) a < (__force u32) b;
479 }
480
481 static int be32_gt(__be32 a, __be32 b)
482 {
483 return (__force u32) a > (__force u32) b;
484 }
485
486 static int be64_lt(__be64 a, __be64 b)
487 {
488 return (__force u64) a < (__force u64) b;
489 }
490
491 static int be64_gt(__be64 a, __be64 b)
492 {
493 return (__force u64) a > (__force u64) b;
494 }
495
496 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
497 {
498 struct rb_node **link = &cm.listen_service_table.rb_node;
499 struct rb_node *parent = NULL;
500 struct cm_id_private *cur_cm_id_priv;
501 __be64 service_id = cm_id_priv->id.service_id;
502 __be64 service_mask = cm_id_priv->id.service_mask;
503 int data_cmp;
504
505 while (*link) {
506 parent = *link;
507 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
508 service_node);
509 data_cmp = cm_compare_data(cm_id_priv->compare_data,
510 cur_cm_id_priv->compare_data);
511 if ((cur_cm_id_priv->id.service_mask & service_id) ==
512 (service_mask & cur_cm_id_priv->id.service_id) &&
513 (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
514 !data_cmp)
515 return cur_cm_id_priv;
516
517 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
518 link = &(*link)->rb_left;
519 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
520 link = &(*link)->rb_right;
521 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
522 link = &(*link)->rb_left;
523 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
524 link = &(*link)->rb_right;
525 else if (data_cmp < 0)
526 link = &(*link)->rb_left;
527 else
528 link = &(*link)->rb_right;
529 }
530 rb_link_node(&cm_id_priv->service_node, parent, link);
531 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
532 return NULL;
533 }
534
535 static struct cm_id_private * cm_find_listen(struct ib_device *device,
536 __be64 service_id,
537 u8 *private_data)
538 {
539 struct rb_node *node = cm.listen_service_table.rb_node;
540 struct cm_id_private *cm_id_priv;
541 int data_cmp;
542
543 while (node) {
544 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
545 data_cmp = cm_compare_private_data(private_data,
546 cm_id_priv->compare_data);
547 if ((cm_id_priv->id.service_mask & service_id) ==
548 cm_id_priv->id.service_id &&
549 (cm_id_priv->id.device == device) && !data_cmp)
550 return cm_id_priv;
551
552 if (device < cm_id_priv->id.device)
553 node = node->rb_left;
554 else if (device > cm_id_priv->id.device)
555 node = node->rb_right;
556 else if (be64_lt(service_id, cm_id_priv->id.service_id))
557 node = node->rb_left;
558 else if (be64_gt(service_id, cm_id_priv->id.service_id))
559 node = node->rb_right;
560 else if (data_cmp < 0)
561 node = node->rb_left;
562 else
563 node = node->rb_right;
564 }
565 return NULL;
566 }
567
568 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
569 *timewait_info)
570 {
571 struct rb_node **link = &cm.remote_id_table.rb_node;
572 struct rb_node *parent = NULL;
573 struct cm_timewait_info *cur_timewait_info;
574 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
575 __be32 remote_id = timewait_info->work.remote_id;
576
577 while (*link) {
578 parent = *link;
579 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
580 remote_id_node);
581 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
582 link = &(*link)->rb_left;
583 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
584 link = &(*link)->rb_right;
585 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
586 link = &(*link)->rb_left;
587 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
588 link = &(*link)->rb_right;
589 else
590 return cur_timewait_info;
591 }
592 timewait_info->inserted_remote_id = 1;
593 rb_link_node(&timewait_info->remote_id_node, parent, link);
594 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
595 return NULL;
596 }
597
598 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
599 __be32 remote_id)
600 {
601 struct rb_node *node = cm.remote_id_table.rb_node;
602 struct cm_timewait_info *timewait_info;
603
604 while (node) {
605 timewait_info = rb_entry(node, struct cm_timewait_info,
606 remote_id_node);
607 if (be32_lt(remote_id, timewait_info->work.remote_id))
608 node = node->rb_left;
609 else if (be32_gt(remote_id, timewait_info->work.remote_id))
610 node = node->rb_right;
611 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
612 node = node->rb_left;
613 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
614 node = node->rb_right;
615 else
616 return timewait_info;
617 }
618 return NULL;
619 }
620
621 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
622 *timewait_info)
623 {
624 struct rb_node **link = &cm.remote_qp_table.rb_node;
625 struct rb_node *parent = NULL;
626 struct cm_timewait_info *cur_timewait_info;
627 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
628 __be32 remote_qpn = timewait_info->remote_qpn;
629
630 while (*link) {
631 parent = *link;
632 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
633 remote_qp_node);
634 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
635 link = &(*link)->rb_left;
636 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
637 link = &(*link)->rb_right;
638 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
639 link = &(*link)->rb_left;
640 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
641 link = &(*link)->rb_right;
642 else
643 return cur_timewait_info;
644 }
645 timewait_info->inserted_remote_qp = 1;
646 rb_link_node(&timewait_info->remote_qp_node, parent, link);
647 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
648 return NULL;
649 }
650
651 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
652 *cm_id_priv)
653 {
654 struct rb_node **link = &cm.remote_sidr_table.rb_node;
655 struct rb_node *parent = NULL;
656 struct cm_id_private *cur_cm_id_priv;
657 union ib_gid *port_gid = &cm_id_priv->av.dgid;
658 __be32 remote_id = cm_id_priv->id.remote_id;
659
660 while (*link) {
661 parent = *link;
662 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
663 sidr_id_node);
664 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
665 link = &(*link)->rb_left;
666 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
667 link = &(*link)->rb_right;
668 else {
669 int cmp;
670 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
671 sizeof *port_gid);
672 if (cmp < 0)
673 link = &(*link)->rb_left;
674 else if (cmp > 0)
675 link = &(*link)->rb_right;
676 else
677 return cur_cm_id_priv;
678 }
679 }
680 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
681 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
682 return NULL;
683 }
684
685 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
686 enum ib_cm_sidr_status status)
687 {
688 struct ib_cm_sidr_rep_param param;
689
690 memset(&param, 0, sizeof param);
691 param.status = status;
692 ib_send_cm_sidr_rep(&cm_id_priv->id, &param);
693 }
694
695 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
696 ib_cm_handler cm_handler,
697 void *context)
698 {
699 struct cm_id_private *cm_id_priv;
700 int ret;
701
702 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
703 if (!cm_id_priv)
704 return ERR_PTR(-ENOMEM);
705
706 cm_id_priv->id.state = IB_CM_IDLE;
707 cm_id_priv->id.device = device;
708 cm_id_priv->id.cm_handler = cm_handler;
709 cm_id_priv->id.context = context;
710 cm_id_priv->id.remote_cm_qpn = 1;
711 ret = cm_alloc_id(cm_id_priv);
712 if (ret)
713 goto error;
714
715 spin_lock_init(&cm_id_priv->lock);
716 init_completion(&cm_id_priv->comp);
717 INIT_LIST_HEAD(&cm_id_priv->work_list);
718 atomic_set(&cm_id_priv->work_count, -1);
719 atomic_set(&cm_id_priv->refcount, 1);
720 return &cm_id_priv->id;
721
722 error:
723 kfree(cm_id_priv);
724 return ERR_PTR(-ENOMEM);
725 }
726 EXPORT_SYMBOL(ib_create_cm_id);
727
728 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
729 {
730 struct cm_work *work;
731
732 if (list_empty(&cm_id_priv->work_list))
733 return NULL;
734
735 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
736 list_del(&work->list);
737 return work;
738 }
739
740 static void cm_free_work(struct cm_work *work)
741 {
742 if (work->mad_recv_wc)
743 ib_free_recv_mad(work->mad_recv_wc);
744 kfree(work);
745 }
746
747 static inline int cm_convert_to_ms(int iba_time)
748 {
749 /* approximate conversion to ms from 4.096us x 2^iba_time */
750 return 1 << max(iba_time - 8, 0);
751 }
752
753 /*
754 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
755 * Because of how ack_timeout is stored, adding one doubles the timeout.
756 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
757 * increment it (round up) only if the other is within 50%.
758 */
759 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
760 {
761 int ack_timeout = packet_life_time + 1;
762
763 if (ack_timeout >= ca_ack_delay)
764 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
765 else
766 ack_timeout = ca_ack_delay +
767 (ack_timeout >= (ca_ack_delay - 1));
768
769 return min(31, ack_timeout);
770 }
771
772 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
773 {
774 if (timewait_info->inserted_remote_id) {
775 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
776 timewait_info->inserted_remote_id = 0;
777 }
778
779 if (timewait_info->inserted_remote_qp) {
780 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
781 timewait_info->inserted_remote_qp = 0;
782 }
783 }
784
785 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
786 {
787 struct cm_timewait_info *timewait_info;
788
789 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
790 if (!timewait_info)
791 return ERR_PTR(-ENOMEM);
792
793 timewait_info->work.local_id = local_id;
794 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
795 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
796 return timewait_info;
797 }
798
799 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
800 {
801 int wait_time;
802 unsigned long flags;
803
804 spin_lock_irqsave(&cm.lock, flags);
805 cm_cleanup_timewait(cm_id_priv->timewait_info);
806 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
807 spin_unlock_irqrestore(&cm.lock, flags);
808
809 /*
810 * The cm_id could be destroyed by the user before we exit timewait.
811 * To protect against this, we search for the cm_id after exiting
812 * timewait before notifying the user that we've exited timewait.
813 */
814 cm_id_priv->id.state = IB_CM_TIMEWAIT;
815 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
816 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
817 msecs_to_jiffies(wait_time));
818 cm_id_priv->timewait_info = NULL;
819 }
820
821 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
822 {
823 unsigned long flags;
824
825 cm_id_priv->id.state = IB_CM_IDLE;
826 if (cm_id_priv->timewait_info) {
827 spin_lock_irqsave(&cm.lock, flags);
828 cm_cleanup_timewait(cm_id_priv->timewait_info);
829 spin_unlock_irqrestore(&cm.lock, flags);
830 kfree(cm_id_priv->timewait_info);
831 cm_id_priv->timewait_info = NULL;
832 }
833 }
834
835 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
836 {
837 struct cm_id_private *cm_id_priv;
838 struct cm_work *work;
839
840 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
841 retest:
842 spin_lock_irq(&cm_id_priv->lock);
843 switch (cm_id->state) {
844 case IB_CM_LISTEN:
845 cm_id->state = IB_CM_IDLE;
846 spin_unlock_irq(&cm_id_priv->lock);
847 spin_lock_irq(&cm.lock);
848 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
849 spin_unlock_irq(&cm.lock);
850 break;
851 case IB_CM_SIDR_REQ_SENT:
852 cm_id->state = IB_CM_IDLE;
853 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
854 spin_unlock_irq(&cm_id_priv->lock);
855 break;
856 case IB_CM_SIDR_REQ_RCVD:
857 spin_unlock_irq(&cm_id_priv->lock);
858 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
859 break;
860 case IB_CM_REQ_SENT:
861 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
862 spin_unlock_irq(&cm_id_priv->lock);
863 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
864 &cm_id_priv->id.device->node_guid,
865 sizeof cm_id_priv->id.device->node_guid,
866 NULL, 0);
867 break;
868 case IB_CM_REQ_RCVD:
869 if (err == -ENOMEM) {
870 /* Do not reject to allow future retries. */
871 cm_reset_to_idle(cm_id_priv);
872 spin_unlock_irq(&cm_id_priv->lock);
873 } else {
874 spin_unlock_irq(&cm_id_priv->lock);
875 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
876 NULL, 0, NULL, 0);
877 }
878 break;
879 case IB_CM_MRA_REQ_RCVD:
880 case IB_CM_REP_SENT:
881 case IB_CM_MRA_REP_RCVD:
882 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
883 /* Fall through */
884 case IB_CM_MRA_REQ_SENT:
885 case IB_CM_REP_RCVD:
886 case IB_CM_MRA_REP_SENT:
887 spin_unlock_irq(&cm_id_priv->lock);
888 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
889 NULL, 0, NULL, 0);
890 break;
891 case IB_CM_ESTABLISHED:
892 spin_unlock_irq(&cm_id_priv->lock);
893 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT)
894 break;
895 ib_send_cm_dreq(cm_id, NULL, 0);
896 goto retest;
897 case IB_CM_DREQ_SENT:
898 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
899 cm_enter_timewait(cm_id_priv);
900 spin_unlock_irq(&cm_id_priv->lock);
901 break;
902 case IB_CM_DREQ_RCVD:
903 spin_unlock_irq(&cm_id_priv->lock);
904 ib_send_cm_drep(cm_id, NULL, 0);
905 break;
906 default:
907 spin_unlock_irq(&cm_id_priv->lock);
908 break;
909 }
910
911 cm_free_id(cm_id->local_id);
912 cm_deref_id(cm_id_priv);
913 wait_for_completion(&cm_id_priv->comp);
914 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
915 cm_free_work(work);
916 kfree(cm_id_priv->compare_data);
917 kfree(cm_id_priv->private_data);
918 kfree(cm_id_priv);
919 }
920
921 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
922 {
923 cm_destroy_id(cm_id, 0);
924 }
925 EXPORT_SYMBOL(ib_destroy_cm_id);
926
927 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
928 struct ib_cm_compare_data *compare_data)
929 {
930 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
931 unsigned long flags;
932 int ret = 0;
933
934 service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
935 service_id &= service_mask;
936 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
937 (service_id != IB_CM_ASSIGN_SERVICE_ID))
938 return -EINVAL;
939
940 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
941 if (cm_id->state != IB_CM_IDLE)
942 return -EINVAL;
943
944 if (compare_data) {
945 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
946 GFP_KERNEL);
947 if (!cm_id_priv->compare_data)
948 return -ENOMEM;
949 cm_mask_copy(cm_id_priv->compare_data->data,
950 compare_data->data, compare_data->mask);
951 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
952 IB_CM_COMPARE_SIZE);
953 }
954
955 cm_id->state = IB_CM_LISTEN;
956
957 spin_lock_irqsave(&cm.lock, flags);
958 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
959 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
960 cm_id->service_mask = ~cpu_to_be64(0);
961 } else {
962 cm_id->service_id = service_id;
963 cm_id->service_mask = service_mask;
964 }
965 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
966 spin_unlock_irqrestore(&cm.lock, flags);
967
968 if (cur_cm_id_priv) {
969 cm_id->state = IB_CM_IDLE;
970 kfree(cm_id_priv->compare_data);
971 cm_id_priv->compare_data = NULL;
972 ret = -EBUSY;
973 }
974 return ret;
975 }
976 EXPORT_SYMBOL(ib_cm_listen);
977
978 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
979 enum cm_msg_sequence msg_seq)
980 {
981 u64 hi_tid, low_tid;
982
983 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
984 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
985 (msg_seq << 30));
986 return cpu_to_be64(hi_tid | low_tid);
987 }
988
989 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
990 __be16 attr_id, __be64 tid)
991 {
992 hdr->base_version = IB_MGMT_BASE_VERSION;
993 hdr->mgmt_class = IB_MGMT_CLASS_CM;
994 hdr->class_version = IB_CM_CLASS_VERSION;
995 hdr->method = IB_MGMT_METHOD_SEND;
996 hdr->attr_id = attr_id;
997 hdr->tid = tid;
998 }
999
1000 static void cm_format_req(struct cm_req_msg *req_msg,
1001 struct cm_id_private *cm_id_priv,
1002 struct ib_cm_req_param *param)
1003 {
1004 struct ib_sa_path_rec *pri_path = param->primary_path;
1005 struct ib_sa_path_rec *alt_path = param->alternate_path;
1006
1007 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1008 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
1009
1010 req_msg->local_comm_id = cm_id_priv->id.local_id;
1011 req_msg->service_id = param->service_id;
1012 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1013 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
1014 cm_req_set_init_depth(req_msg, param->initiator_depth);
1015 cm_req_set_remote_resp_timeout(req_msg,
1016 param->remote_cm_response_timeout);
1017 cm_req_set_qp_type(req_msg, param->qp_type);
1018 cm_req_set_flow_ctrl(req_msg, param->flow_control);
1019 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
1020 cm_req_set_local_resp_timeout(req_msg,
1021 param->local_cm_response_timeout);
1022 req_msg->pkey = param->primary_path->pkey;
1023 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
1024 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
1025
1026 if (param->qp_type != IB_QPT_XRC_INI) {
1027 cm_req_set_resp_res(req_msg, param->responder_resources);
1028 cm_req_set_retry_count(req_msg, param->retry_count);
1029 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
1030 cm_req_set_srq(req_msg, param->srq);
1031 }
1032
1033 if (pri_path->hop_limit <= 1) {
1034 req_msg->primary_local_lid = pri_path->slid;
1035 req_msg->primary_remote_lid = pri_path->dlid;
1036 } else {
1037 /* Work-around until there's a way to obtain remote LID info */
1038 req_msg->primary_local_lid = IB_LID_PERMISSIVE;
1039 req_msg->primary_remote_lid = IB_LID_PERMISSIVE;
1040 }
1041 req_msg->primary_local_gid = pri_path->sgid;
1042 req_msg->primary_remote_gid = pri_path->dgid;
1043 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label);
1044 cm_req_set_primary_packet_rate(req_msg, pri_path->rate);
1045 req_msg->primary_traffic_class = pri_path->traffic_class;
1046 req_msg->primary_hop_limit = pri_path->hop_limit;
1047 cm_req_set_primary_sl(req_msg, pri_path->sl);
1048 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1));
1049 cm_req_set_primary_local_ack_timeout(req_msg,
1050 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1051 pri_path->packet_life_time));
1052
1053 if (alt_path) {
1054 if (alt_path->hop_limit <= 1) {
1055 req_msg->alt_local_lid = alt_path->slid;
1056 req_msg->alt_remote_lid = alt_path->dlid;
1057 } else {
1058 req_msg->alt_local_lid = IB_LID_PERMISSIVE;
1059 req_msg->alt_remote_lid = IB_LID_PERMISSIVE;
1060 }
1061 req_msg->alt_local_gid = alt_path->sgid;
1062 req_msg->alt_remote_gid = alt_path->dgid;
1063 cm_req_set_alt_flow_label(req_msg,
1064 alt_path->flow_label);
1065 cm_req_set_alt_packet_rate(req_msg, alt_path->rate);
1066 req_msg->alt_traffic_class = alt_path->traffic_class;
1067 req_msg->alt_hop_limit = alt_path->hop_limit;
1068 cm_req_set_alt_sl(req_msg, alt_path->sl);
1069 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1));
1070 cm_req_set_alt_local_ack_timeout(req_msg,
1071 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1072 alt_path->packet_life_time));
1073 }
1074
1075 if (param->private_data && param->private_data_len)
1076 memcpy(req_msg->private_data, param->private_data,
1077 param->private_data_len);
1078 }
1079
1080 static int cm_validate_req_param(struct ib_cm_req_param *param)
1081 {
1082 /* peer-to-peer not supported */
1083 if (param->peer_to_peer)
1084 return -EINVAL;
1085
1086 if (!param->primary_path)
1087 return -EINVAL;
1088
1089 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1090 param->qp_type != IB_QPT_XRC_INI)
1091 return -EINVAL;
1092
1093 if (param->private_data &&
1094 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1095 return -EINVAL;
1096
1097 if (param->alternate_path &&
1098 (param->alternate_path->pkey != param->primary_path->pkey ||
1099 param->alternate_path->mtu != param->primary_path->mtu))
1100 return -EINVAL;
1101
1102 return 0;
1103 }
1104
1105 int ib_send_cm_req(struct ib_cm_id *cm_id,
1106 struct ib_cm_req_param *param)
1107 {
1108 struct cm_id_private *cm_id_priv;
1109 struct cm_req_msg *req_msg;
1110 unsigned long flags;
1111 int ret;
1112
1113 ret = cm_validate_req_param(param);
1114 if (ret)
1115 return ret;
1116
1117 /* Verify that we're not in timewait. */
1118 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1119 spin_lock_irqsave(&cm_id_priv->lock, flags);
1120 if (cm_id->state != IB_CM_IDLE) {
1121 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1122 ret = -EINVAL;
1123 goto out;
1124 }
1125 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1126
1127 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1128 id.local_id);
1129 if (IS_ERR(cm_id_priv->timewait_info)) {
1130 ret = PTR_ERR(cm_id_priv->timewait_info);
1131 goto out;
1132 }
1133
1134 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
1135 if (ret)
1136 goto error1;
1137 if (param->alternate_path) {
1138 ret = cm_init_av_by_path(param->alternate_path,
1139 &cm_id_priv->alt_av);
1140 if (ret)
1141 goto error1;
1142 }
1143 cm_id->service_id = param->service_id;
1144 cm_id->service_mask = ~cpu_to_be64(0);
1145 cm_id_priv->timeout_ms = cm_convert_to_ms(
1146 param->primary_path->packet_life_time) * 2 +
1147 cm_convert_to_ms(
1148 param->remote_cm_response_timeout);
1149 cm_id_priv->max_cm_retries = param->max_cm_retries;
1150 cm_id_priv->initiator_depth = param->initiator_depth;
1151 cm_id_priv->responder_resources = param->responder_resources;
1152 cm_id_priv->retry_count = param->retry_count;
1153 cm_id_priv->path_mtu = param->primary_path->mtu;
1154 cm_id_priv->pkey = param->primary_path->pkey;
1155 cm_id_priv->qp_type = param->qp_type;
1156
1157 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1158 if (ret)
1159 goto error1;
1160
1161 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1162 cm_format_req(req_msg, cm_id_priv, param);
1163 cm_id_priv->tid = req_msg->hdr.tid;
1164 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1165 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1166
1167 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1168 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1169
1170 spin_lock_irqsave(&cm_id_priv->lock, flags);
1171 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1172 if (ret) {
1173 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1174 goto error2;
1175 }
1176 BUG_ON(cm_id->state != IB_CM_IDLE);
1177 cm_id->state = IB_CM_REQ_SENT;
1178 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1179 return 0;
1180
1181 error2: cm_free_msg(cm_id_priv->msg);
1182 error1: kfree(cm_id_priv->timewait_info);
1183 out: return ret;
1184 }
1185 EXPORT_SYMBOL(ib_send_cm_req);
1186
1187 static int cm_issue_rej(struct cm_port *port,
1188 struct ib_mad_recv_wc *mad_recv_wc,
1189 enum ib_cm_rej_reason reason,
1190 enum cm_msg_response msg_rejected,
1191 void *ari, u8 ari_length)
1192 {
1193 struct ib_mad_send_buf *msg = NULL;
1194 struct cm_rej_msg *rej_msg, *rcv_msg;
1195 int ret;
1196
1197 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1198 if (ret)
1199 return ret;
1200
1201 /* We just need common CM header information. Cast to any message. */
1202 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1203 rej_msg = (struct cm_rej_msg *) msg->mad;
1204
1205 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1206 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1207 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1208 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1209 rej_msg->reason = cpu_to_be16(reason);
1210
1211 if (ari && ari_length) {
1212 cm_rej_set_reject_info_len(rej_msg, ari_length);
1213 memcpy(rej_msg->ari, ari, ari_length);
1214 }
1215
1216 ret = ib_post_send_mad(msg, NULL);
1217 if (ret)
1218 cm_free_msg(msg);
1219
1220 return ret;
1221 }
1222
1223 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1224 __be32 local_qpn, __be32 remote_qpn)
1225 {
1226 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1227 ((local_ca_guid == remote_ca_guid) &&
1228 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1229 }
1230
1231 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1232 struct ib_sa_path_rec *primary_path,
1233 struct ib_sa_path_rec *alt_path)
1234 {
1235 memset(primary_path, 0, sizeof *primary_path);
1236 primary_path->dgid = req_msg->primary_local_gid;
1237 primary_path->sgid = req_msg->primary_remote_gid;
1238 primary_path->dlid = req_msg->primary_local_lid;
1239 primary_path->slid = req_msg->primary_remote_lid;
1240 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1241 primary_path->hop_limit = req_msg->primary_hop_limit;
1242 primary_path->traffic_class = req_msg->primary_traffic_class;
1243 primary_path->reversible = 1;
1244 primary_path->pkey = req_msg->pkey;
1245 primary_path->sl = cm_req_get_primary_sl(req_msg);
1246 primary_path->mtu_selector = IB_SA_EQ;
1247 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1248 primary_path->rate_selector = IB_SA_EQ;
1249 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1250 primary_path->packet_life_time_selector = IB_SA_EQ;
1251 primary_path->packet_life_time =
1252 cm_req_get_primary_local_ack_timeout(req_msg);
1253 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1254
1255 if (req_msg->alt_local_lid) {
1256 memset(alt_path, 0, sizeof *alt_path);
1257 alt_path->dgid = req_msg->alt_local_gid;
1258 alt_path->sgid = req_msg->alt_remote_gid;
1259 alt_path->dlid = req_msg->alt_local_lid;
1260 alt_path->slid = req_msg->alt_remote_lid;
1261 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1262 alt_path->hop_limit = req_msg->alt_hop_limit;
1263 alt_path->traffic_class = req_msg->alt_traffic_class;
1264 alt_path->reversible = 1;
1265 alt_path->pkey = req_msg->pkey;
1266 alt_path->sl = cm_req_get_alt_sl(req_msg);
1267 alt_path->mtu_selector = IB_SA_EQ;
1268 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1269 alt_path->rate_selector = IB_SA_EQ;
1270 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1271 alt_path->packet_life_time_selector = IB_SA_EQ;
1272 alt_path->packet_life_time =
1273 cm_req_get_alt_local_ack_timeout(req_msg);
1274 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1275 }
1276 }
1277
1278 static void cm_format_req_event(struct cm_work *work,
1279 struct cm_id_private *cm_id_priv,
1280 struct ib_cm_id *listen_id)
1281 {
1282 struct cm_req_msg *req_msg;
1283 struct ib_cm_req_event_param *param;
1284
1285 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1286 param = &work->cm_event.param.req_rcvd;
1287 param->listen_id = listen_id;
1288 param->port = cm_id_priv->av.port->port_num;
1289 param->primary_path = &work->path[0];
1290 if (req_msg->alt_local_lid)
1291 param->alternate_path = &work->path[1];
1292 else
1293 param->alternate_path = NULL;
1294 param->remote_ca_guid = req_msg->local_ca_guid;
1295 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1296 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1297 param->qp_type = cm_req_get_qp_type(req_msg);
1298 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1299 param->responder_resources = cm_req_get_init_depth(req_msg);
1300 param->initiator_depth = cm_req_get_resp_res(req_msg);
1301 param->local_cm_response_timeout =
1302 cm_req_get_remote_resp_timeout(req_msg);
1303 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1304 param->remote_cm_response_timeout =
1305 cm_req_get_local_resp_timeout(req_msg);
1306 param->retry_count = cm_req_get_retry_count(req_msg);
1307 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1308 param->srq = cm_req_get_srq(req_msg);
1309 work->cm_event.private_data = &req_msg->private_data;
1310 }
1311
1312 static void cm_process_work(struct cm_id_private *cm_id_priv,
1313 struct cm_work *work)
1314 {
1315 int ret;
1316
1317 /* We will typically only have the current event to report. */
1318 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1319 cm_free_work(work);
1320
1321 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1322 spin_lock_irq(&cm_id_priv->lock);
1323 work = cm_dequeue_work(cm_id_priv);
1324 spin_unlock_irq(&cm_id_priv->lock);
1325 BUG_ON(!work);
1326 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1327 &work->cm_event);
1328 cm_free_work(work);
1329 }
1330 cm_deref_id(cm_id_priv);
1331 if (ret)
1332 cm_destroy_id(&cm_id_priv->id, ret);
1333 }
1334
1335 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1336 struct cm_id_private *cm_id_priv,
1337 enum cm_msg_response msg_mraed, u8 service_timeout,
1338 const void *private_data, u8 private_data_len)
1339 {
1340 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1341 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1342 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1343 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1344 cm_mra_set_service_timeout(mra_msg, service_timeout);
1345
1346 if (private_data && private_data_len)
1347 memcpy(mra_msg->private_data, private_data, private_data_len);
1348 }
1349
1350 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1351 struct cm_id_private *cm_id_priv,
1352 enum ib_cm_rej_reason reason,
1353 void *ari,
1354 u8 ari_length,
1355 const void *private_data,
1356 u8 private_data_len)
1357 {
1358 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1359 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1360
1361 switch(cm_id_priv->id.state) {
1362 case IB_CM_REQ_RCVD:
1363 rej_msg->local_comm_id = 0;
1364 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1365 break;
1366 case IB_CM_MRA_REQ_SENT:
1367 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1368 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1369 break;
1370 case IB_CM_REP_RCVD:
1371 case IB_CM_MRA_REP_SENT:
1372 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1373 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1374 break;
1375 default:
1376 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1377 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1378 break;
1379 }
1380
1381 rej_msg->reason = cpu_to_be16(reason);
1382 if (ari && ari_length) {
1383 cm_rej_set_reject_info_len(rej_msg, ari_length);
1384 memcpy(rej_msg->ari, ari, ari_length);
1385 }
1386
1387 if (private_data && private_data_len)
1388 memcpy(rej_msg->private_data, private_data, private_data_len);
1389 }
1390
1391 static void cm_dup_req_handler(struct cm_work *work,
1392 struct cm_id_private *cm_id_priv)
1393 {
1394 struct ib_mad_send_buf *msg = NULL;
1395 int ret;
1396
1397 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1398 counter[CM_REQ_COUNTER]);
1399
1400 /* Quick state check to discard duplicate REQs. */
1401 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1402 return;
1403
1404 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1405 if (ret)
1406 return;
1407
1408 spin_lock_irq(&cm_id_priv->lock);
1409 switch (cm_id_priv->id.state) {
1410 case IB_CM_MRA_REQ_SENT:
1411 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1412 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1413 cm_id_priv->private_data,
1414 cm_id_priv->private_data_len);
1415 break;
1416 case IB_CM_TIMEWAIT:
1417 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1418 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1419 break;
1420 default:
1421 goto unlock;
1422 }
1423 spin_unlock_irq(&cm_id_priv->lock);
1424
1425 ret = ib_post_send_mad(msg, NULL);
1426 if (ret)
1427 goto free;
1428 return;
1429
1430 unlock: spin_unlock_irq(&cm_id_priv->lock);
1431 free: cm_free_msg(msg);
1432 }
1433
1434 static struct cm_id_private * cm_match_req(struct cm_work *work,
1435 struct cm_id_private *cm_id_priv)
1436 {
1437 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1438 struct cm_timewait_info *timewait_info;
1439 struct cm_req_msg *req_msg;
1440
1441 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1442
1443 /* Check for possible duplicate REQ. */
1444 spin_lock_irq(&cm.lock);
1445 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1446 if (timewait_info) {
1447 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1448 timewait_info->work.remote_id);
1449 spin_unlock_irq(&cm.lock);
1450 if (cur_cm_id_priv) {
1451 cm_dup_req_handler(work, cur_cm_id_priv);
1452 cm_deref_id(cur_cm_id_priv);
1453 }
1454 return NULL;
1455 }
1456
1457 /* Check for stale connections. */
1458 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1459 if (timewait_info) {
1460 cm_cleanup_timewait(cm_id_priv->timewait_info);
1461 spin_unlock_irq(&cm.lock);
1462 cm_issue_rej(work->port, work->mad_recv_wc,
1463 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1464 NULL, 0);
1465 return NULL;
1466 }
1467
1468 /* Find matching listen request. */
1469 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1470 req_msg->service_id,
1471 req_msg->private_data);
1472 if (!listen_cm_id_priv) {
1473 cm_cleanup_timewait(cm_id_priv->timewait_info);
1474 spin_unlock_irq(&cm.lock);
1475 cm_issue_rej(work->port, work->mad_recv_wc,
1476 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1477 NULL, 0);
1478 goto out;
1479 }
1480 atomic_inc(&listen_cm_id_priv->refcount);
1481 atomic_inc(&cm_id_priv->refcount);
1482 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1483 atomic_inc(&cm_id_priv->work_count);
1484 spin_unlock_irq(&cm.lock);
1485 out:
1486 return listen_cm_id_priv;
1487 }
1488
1489 /*
1490 * Work-around for inter-subnet connections. If the LIDs are permissive,
1491 * we need to override the LID/SL data in the REQ with the LID information
1492 * in the work completion.
1493 */
1494 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
1495 {
1496 if (!cm_req_get_primary_subnet_local(req_msg)) {
1497 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) {
1498 req_msg->primary_local_lid = cpu_to_be16(wc->slid);
1499 cm_req_set_primary_sl(req_msg, wc->sl);
1500 }
1501
1502 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE)
1503 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1504 }
1505
1506 if (!cm_req_get_alt_subnet_local(req_msg)) {
1507 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) {
1508 req_msg->alt_local_lid = cpu_to_be16(wc->slid);
1509 cm_req_set_alt_sl(req_msg, wc->sl);
1510 }
1511
1512 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE)
1513 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1514 }
1515 }
1516
1517 static int cm_req_handler(struct cm_work *work)
1518 {
1519 struct ib_cm_id *cm_id;
1520 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1521 struct cm_req_msg *req_msg;
1522 int ret;
1523
1524 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1525
1526 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
1527 if (IS_ERR(cm_id))
1528 return PTR_ERR(cm_id);
1529
1530 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1531 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1532 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1533 work->mad_recv_wc->recv_buf.grh,
1534 &cm_id_priv->av);
1535 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1536 id.local_id);
1537 if (IS_ERR(cm_id_priv->timewait_info)) {
1538 ret = PTR_ERR(cm_id_priv->timewait_info);
1539 goto destroy;
1540 }
1541 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1542 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1543 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1544
1545 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1546 if (!listen_cm_id_priv) {
1547 ret = -EINVAL;
1548 kfree(cm_id_priv->timewait_info);
1549 goto destroy;
1550 }
1551
1552 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1553 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1554 cm_id_priv->id.service_id = req_msg->service_id;
1555 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1556
1557 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
1558 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1559 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1560 if (ret) {
1561 ib_get_cached_gid(work->port->cm_dev->ib_device,
1562 work->port->port_num, 0, &work->path[0].sgid);
1563 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1564 &work->path[0].sgid, sizeof work->path[0].sgid,
1565 NULL, 0);
1566 goto rejected;
1567 }
1568 if (req_msg->alt_local_lid) {
1569 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1570 if (ret) {
1571 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1572 &work->path[0].sgid,
1573 sizeof work->path[0].sgid, NULL, 0);
1574 goto rejected;
1575 }
1576 }
1577 cm_id_priv->tid = req_msg->hdr.tid;
1578 cm_id_priv->timeout_ms = cm_convert_to_ms(
1579 cm_req_get_local_resp_timeout(req_msg));
1580 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1581 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1582 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1583 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1584 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1585 cm_id_priv->pkey = req_msg->pkey;
1586 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1587 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1588 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1589 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1590
1591 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1592 cm_process_work(cm_id_priv, work);
1593 cm_deref_id(listen_cm_id_priv);
1594 return 0;
1595
1596 rejected:
1597 atomic_dec(&cm_id_priv->refcount);
1598 cm_deref_id(listen_cm_id_priv);
1599 destroy:
1600 ib_destroy_cm_id(cm_id);
1601 return ret;
1602 }
1603
1604 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1605 struct cm_id_private *cm_id_priv,
1606 struct ib_cm_rep_param *param)
1607 {
1608 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1609 rep_msg->local_comm_id = cm_id_priv->id.local_id;
1610 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1611 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1612 rep_msg->resp_resources = param->responder_resources;
1613 cm_rep_set_target_ack_delay(rep_msg,
1614 cm_id_priv->av.port->cm_dev->ack_delay);
1615 cm_rep_set_failover(rep_msg, param->failover_accepted);
1616 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1617 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1618
1619 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
1620 rep_msg->initiator_depth = param->initiator_depth;
1621 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1622 cm_rep_set_srq(rep_msg, param->srq);
1623 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1624 } else {
1625 cm_rep_set_srq(rep_msg, 1);
1626 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num));
1627 }
1628
1629 if (param->private_data && param->private_data_len)
1630 memcpy(rep_msg->private_data, param->private_data,
1631 param->private_data_len);
1632 }
1633
1634 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1635 struct ib_cm_rep_param *param)
1636 {
1637 struct cm_id_private *cm_id_priv;
1638 struct ib_mad_send_buf *msg;
1639 struct cm_rep_msg *rep_msg;
1640 unsigned long flags;
1641 int ret;
1642
1643 if (param->private_data &&
1644 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1645 return -EINVAL;
1646
1647 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1648 spin_lock_irqsave(&cm_id_priv->lock, flags);
1649 if (cm_id->state != IB_CM_REQ_RCVD &&
1650 cm_id->state != IB_CM_MRA_REQ_SENT) {
1651 ret = -EINVAL;
1652 goto out;
1653 }
1654
1655 ret = cm_alloc_msg(cm_id_priv, &msg);
1656 if (ret)
1657 goto out;
1658
1659 rep_msg = (struct cm_rep_msg *) msg->mad;
1660 cm_format_rep(rep_msg, cm_id_priv, param);
1661 msg->timeout_ms = cm_id_priv->timeout_ms;
1662 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1663
1664 ret = ib_post_send_mad(msg, NULL);
1665 if (ret) {
1666 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1667 cm_free_msg(msg);
1668 return ret;
1669 }
1670
1671 cm_id->state = IB_CM_REP_SENT;
1672 cm_id_priv->msg = msg;
1673 cm_id_priv->initiator_depth = param->initiator_depth;
1674 cm_id_priv->responder_resources = param->responder_resources;
1675 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1676 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
1677
1678 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1679 return ret;
1680 }
1681 EXPORT_SYMBOL(ib_send_cm_rep);
1682
1683 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1684 struct cm_id_private *cm_id_priv,
1685 const void *private_data,
1686 u8 private_data_len)
1687 {
1688 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1689 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1690 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1691
1692 if (private_data && private_data_len)
1693 memcpy(rtu_msg->private_data, private_data, private_data_len);
1694 }
1695
1696 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1697 const void *private_data,
1698 u8 private_data_len)
1699 {
1700 struct cm_id_private *cm_id_priv;
1701 struct ib_mad_send_buf *msg;
1702 unsigned long flags;
1703 void *data;
1704 int ret;
1705
1706 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1707 return -EINVAL;
1708
1709 data = cm_copy_private_data(private_data, private_data_len);
1710 if (IS_ERR(data))
1711 return PTR_ERR(data);
1712
1713 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1714 spin_lock_irqsave(&cm_id_priv->lock, flags);
1715 if (cm_id->state != IB_CM_REP_RCVD &&
1716 cm_id->state != IB_CM_MRA_REP_SENT) {
1717 ret = -EINVAL;
1718 goto error;
1719 }
1720
1721 ret = cm_alloc_msg(cm_id_priv, &msg);
1722 if (ret)
1723 goto error;
1724
1725 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1726 private_data, private_data_len);
1727
1728 ret = ib_post_send_mad(msg, NULL);
1729 if (ret) {
1730 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1731 cm_free_msg(msg);
1732 kfree(data);
1733 return ret;
1734 }
1735
1736 cm_id->state = IB_CM_ESTABLISHED;
1737 cm_set_private_data(cm_id_priv, data, private_data_len);
1738 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1739 return 0;
1740
1741 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1742 kfree(data);
1743 return ret;
1744 }
1745 EXPORT_SYMBOL(ib_send_cm_rtu);
1746
1747 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
1748 {
1749 struct cm_rep_msg *rep_msg;
1750 struct ib_cm_rep_event_param *param;
1751
1752 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1753 param = &work->cm_event.param.rep_rcvd;
1754 param->remote_ca_guid = rep_msg->local_ca_guid;
1755 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1756 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
1757 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1758 param->responder_resources = rep_msg->initiator_depth;
1759 param->initiator_depth = rep_msg->resp_resources;
1760 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1761 param->failover_accepted = cm_rep_get_failover(rep_msg);
1762 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1763 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1764 param->srq = cm_rep_get_srq(rep_msg);
1765 work->cm_event.private_data = &rep_msg->private_data;
1766 }
1767
1768 static void cm_dup_rep_handler(struct cm_work *work)
1769 {
1770 struct cm_id_private *cm_id_priv;
1771 struct cm_rep_msg *rep_msg;
1772 struct ib_mad_send_buf *msg = NULL;
1773 int ret;
1774
1775 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1776 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1777 rep_msg->local_comm_id);
1778 if (!cm_id_priv)
1779 return;
1780
1781 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1782 counter[CM_REP_COUNTER]);
1783 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1784 if (ret)
1785 goto deref;
1786
1787 spin_lock_irq(&cm_id_priv->lock);
1788 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1789 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1790 cm_id_priv->private_data,
1791 cm_id_priv->private_data_len);
1792 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1793 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1794 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1795 cm_id_priv->private_data,
1796 cm_id_priv->private_data_len);
1797 else
1798 goto unlock;
1799 spin_unlock_irq(&cm_id_priv->lock);
1800
1801 ret = ib_post_send_mad(msg, NULL);
1802 if (ret)
1803 goto free;
1804 goto deref;
1805
1806 unlock: spin_unlock_irq(&cm_id_priv->lock);
1807 free: cm_free_msg(msg);
1808 deref: cm_deref_id(cm_id_priv);
1809 }
1810
1811 static int cm_rep_handler(struct cm_work *work)
1812 {
1813 struct cm_id_private *cm_id_priv;
1814 struct cm_rep_msg *rep_msg;
1815 int ret;
1816
1817 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1818 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1819 if (!cm_id_priv) {
1820 cm_dup_rep_handler(work);
1821 return -EINVAL;
1822 }
1823
1824 cm_format_rep_event(work, cm_id_priv->qp_type);
1825
1826 spin_lock_irq(&cm_id_priv->lock);
1827 switch (cm_id_priv->id.state) {
1828 case IB_CM_REQ_SENT:
1829 case IB_CM_MRA_REQ_RCVD:
1830 break;
1831 default:
1832 spin_unlock_irq(&cm_id_priv->lock);
1833 ret = -EINVAL;
1834 goto error;
1835 }
1836
1837 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1838 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1839 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
1840
1841 spin_lock(&cm.lock);
1842 /* Check for duplicate REP. */
1843 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1844 spin_unlock(&cm.lock);
1845 spin_unlock_irq(&cm_id_priv->lock);
1846 ret = -EINVAL;
1847 goto error;
1848 }
1849 /* Check for a stale connection. */
1850 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1851 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1852 &cm.remote_id_table);
1853 cm_id_priv->timewait_info->inserted_remote_id = 0;
1854 spin_unlock(&cm.lock);
1855 spin_unlock_irq(&cm_id_priv->lock);
1856 cm_issue_rej(work->port, work->mad_recv_wc,
1857 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1858 NULL, 0);
1859 ret = -EINVAL;
1860 goto error;
1861 }
1862 spin_unlock(&cm.lock);
1863
1864 cm_id_priv->id.state = IB_CM_REP_RCVD;
1865 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1866 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
1867 cm_id_priv->initiator_depth = rep_msg->resp_resources;
1868 cm_id_priv->responder_resources = rep_msg->initiator_depth;
1869 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1870 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1871 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1872 cm_id_priv->av.timeout =
1873 cm_ack_timeout(cm_id_priv->target_ack_delay,
1874 cm_id_priv->av.timeout - 1);
1875 cm_id_priv->alt_av.timeout =
1876 cm_ack_timeout(cm_id_priv->target_ack_delay,
1877 cm_id_priv->alt_av.timeout - 1);
1878
1879 /* todo: handle peer_to_peer */
1880
1881 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1882 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1883 if (!ret)
1884 list_add_tail(&work->list, &cm_id_priv->work_list);
1885 spin_unlock_irq(&cm_id_priv->lock);
1886
1887 if (ret)
1888 cm_process_work(cm_id_priv, work);
1889 else
1890 cm_deref_id(cm_id_priv);
1891 return 0;
1892
1893 error:
1894 cm_deref_id(cm_id_priv);
1895 return ret;
1896 }
1897
1898 static int cm_establish_handler(struct cm_work *work)
1899 {
1900 struct cm_id_private *cm_id_priv;
1901 int ret;
1902
1903 /* See comment in cm_establish about lookup. */
1904 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1905 if (!cm_id_priv)
1906 return -EINVAL;
1907
1908 spin_lock_irq(&cm_id_priv->lock);
1909 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1910 spin_unlock_irq(&cm_id_priv->lock);
1911 goto out;
1912 }
1913
1914 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1915 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1916 if (!ret)
1917 list_add_tail(&work->list, &cm_id_priv->work_list);
1918 spin_unlock_irq(&cm_id_priv->lock);
1919
1920 if (ret)
1921 cm_process_work(cm_id_priv, work);
1922 else
1923 cm_deref_id(cm_id_priv);
1924 return 0;
1925 out:
1926 cm_deref_id(cm_id_priv);
1927 return -EINVAL;
1928 }
1929
1930 static int cm_rtu_handler(struct cm_work *work)
1931 {
1932 struct cm_id_private *cm_id_priv;
1933 struct cm_rtu_msg *rtu_msg;
1934 int ret;
1935
1936 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1937 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1938 rtu_msg->local_comm_id);
1939 if (!cm_id_priv)
1940 return -EINVAL;
1941
1942 work->cm_event.private_data = &rtu_msg->private_data;
1943
1944 spin_lock_irq(&cm_id_priv->lock);
1945 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1946 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1947 spin_unlock_irq(&cm_id_priv->lock);
1948 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1949 counter[CM_RTU_COUNTER]);
1950 goto out;
1951 }
1952 cm_id_priv->id.state = IB_CM_ESTABLISHED;
1953
1954 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1955 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1956 if (!ret)
1957 list_add_tail(&work->list, &cm_id_priv->work_list);
1958 spin_unlock_irq(&cm_id_priv->lock);
1959
1960 if (ret)
1961 cm_process_work(cm_id_priv, work);
1962 else
1963 cm_deref_id(cm_id_priv);
1964 return 0;
1965 out:
1966 cm_deref_id(cm_id_priv);
1967 return -EINVAL;
1968 }
1969
1970 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1971 struct cm_id_private *cm_id_priv,
1972 const void *private_data,
1973 u8 private_data_len)
1974 {
1975 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1976 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1977 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1978 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1979 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1980
1981 if (private_data && private_data_len)
1982 memcpy(dreq_msg->private_data, private_data, private_data_len);
1983 }
1984
1985 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1986 const void *private_data,
1987 u8 private_data_len)
1988 {
1989 struct cm_id_private *cm_id_priv;
1990 struct ib_mad_send_buf *msg;
1991 unsigned long flags;
1992 int ret;
1993
1994 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
1995 return -EINVAL;
1996
1997 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1998 spin_lock_irqsave(&cm_id_priv->lock, flags);
1999 if (cm_id->state != IB_CM_ESTABLISHED) {
2000 ret = -EINVAL;
2001 goto out;
2002 }
2003
2004 if (cm_id->lap_state == IB_CM_LAP_SENT ||
2005 cm_id->lap_state == IB_CM_MRA_LAP_RCVD)
2006 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2007
2008 ret = cm_alloc_msg(cm_id_priv, &msg);
2009 if (ret) {
2010 cm_enter_timewait(cm_id_priv);
2011 goto out;
2012 }
2013
2014 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2015 private_data, private_data_len);
2016 msg->timeout_ms = cm_id_priv->timeout_ms;
2017 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2018
2019 ret = ib_post_send_mad(msg, NULL);
2020 if (ret) {
2021 cm_enter_timewait(cm_id_priv);
2022 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2023 cm_free_msg(msg);
2024 return ret;
2025 }
2026
2027 cm_id->state = IB_CM_DREQ_SENT;
2028 cm_id_priv->msg = msg;
2029 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2030 return ret;
2031 }
2032 EXPORT_SYMBOL(ib_send_cm_dreq);
2033
2034 static void cm_format_drep(struct cm_drep_msg *drep_msg,
2035 struct cm_id_private *cm_id_priv,
2036 const void *private_data,
2037 u8 private_data_len)
2038 {
2039 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2040 drep_msg->local_comm_id = cm_id_priv->id.local_id;
2041 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2042
2043 if (private_data && private_data_len)
2044 memcpy(drep_msg->private_data, private_data, private_data_len);
2045 }
2046
2047 int ib_send_cm_drep(struct ib_cm_id *cm_id,
2048 const void *private_data,
2049 u8 private_data_len)
2050 {
2051 struct cm_id_private *cm_id_priv;
2052 struct ib_mad_send_buf *msg;
2053 unsigned long flags;
2054 void *data;
2055 int ret;
2056
2057 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2058 return -EINVAL;
2059
2060 data = cm_copy_private_data(private_data, private_data_len);
2061 if (IS_ERR(data))
2062 return PTR_ERR(data);
2063
2064 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2065 spin_lock_irqsave(&cm_id_priv->lock, flags);
2066 if (cm_id->state != IB_CM_DREQ_RCVD) {
2067 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2068 kfree(data);
2069 return -EINVAL;
2070 }
2071
2072 cm_set_private_data(cm_id_priv, data, private_data_len);
2073 cm_enter_timewait(cm_id_priv);
2074
2075 ret = cm_alloc_msg(cm_id_priv, &msg);
2076 if (ret)
2077 goto out;
2078
2079 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2080 private_data, private_data_len);
2081
2082 ret = ib_post_send_mad(msg, NULL);
2083 if (ret) {
2084 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2085 cm_free_msg(msg);
2086 return ret;
2087 }
2088
2089 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2090 return ret;
2091 }
2092 EXPORT_SYMBOL(ib_send_cm_drep);
2093
2094 static int cm_issue_drep(struct cm_port *port,
2095 struct ib_mad_recv_wc *mad_recv_wc)
2096 {
2097 struct ib_mad_send_buf *msg = NULL;
2098 struct cm_dreq_msg *dreq_msg;
2099 struct cm_drep_msg *drep_msg;
2100 int ret;
2101
2102 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2103 if (ret)
2104 return ret;
2105
2106 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2107 drep_msg = (struct cm_drep_msg *) msg->mad;
2108
2109 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2110 drep_msg->remote_comm_id = dreq_msg->local_comm_id;
2111 drep_msg->local_comm_id = dreq_msg->remote_comm_id;
2112
2113 ret = ib_post_send_mad(msg, NULL);
2114 if (ret)
2115 cm_free_msg(msg);
2116
2117 return ret;
2118 }
2119
2120 static int cm_dreq_handler(struct cm_work *work)
2121 {
2122 struct cm_id_private *cm_id_priv;
2123 struct cm_dreq_msg *dreq_msg;
2124 struct ib_mad_send_buf *msg = NULL;
2125 int ret;
2126
2127 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2128 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
2129 dreq_msg->local_comm_id);
2130 if (!cm_id_priv) {
2131 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2132 counter[CM_DREQ_COUNTER]);
2133 cm_issue_drep(work->port, work->mad_recv_wc);
2134 return -EINVAL;
2135 }
2136
2137 work->cm_event.private_data = &dreq_msg->private_data;
2138
2139 spin_lock_irq(&cm_id_priv->lock);
2140 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
2141 goto unlock;
2142
2143 switch (cm_id_priv->id.state) {
2144 case IB_CM_REP_SENT:
2145 case IB_CM_DREQ_SENT:
2146 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2147 break;
2148 case IB_CM_ESTABLISHED:
2149 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2150 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2151 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2152 break;
2153 case IB_CM_MRA_REP_RCVD:
2154 break;
2155 case IB_CM_TIMEWAIT:
2156 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2157 counter[CM_DREQ_COUNTER]);
2158 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2159 goto unlock;
2160
2161 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2162 cm_id_priv->private_data,
2163 cm_id_priv->private_data_len);
2164 spin_unlock_irq(&cm_id_priv->lock);
2165
2166 if (ib_post_send_mad(msg, NULL))
2167 cm_free_msg(msg);
2168 goto deref;
2169 case IB_CM_DREQ_RCVD:
2170 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2171 counter[CM_DREQ_COUNTER]);
2172 goto unlock;
2173 default:
2174 goto unlock;
2175 }
2176 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2177 cm_id_priv->tid = dreq_msg->hdr.tid;
2178 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2179 if (!ret)
2180 list_add_tail(&work->list, &cm_id_priv->work_list);
2181 spin_unlock_irq(&cm_id_priv->lock);
2182
2183 if (ret)
2184 cm_process_work(cm_id_priv, work);
2185 else
2186 cm_deref_id(cm_id_priv);
2187 return 0;
2188
2189 unlock: spin_unlock_irq(&cm_id_priv->lock);
2190 deref: cm_deref_id(cm_id_priv);
2191 return -EINVAL;
2192 }
2193
2194 static int cm_drep_handler(struct cm_work *work)
2195 {
2196 struct cm_id_private *cm_id_priv;
2197 struct cm_drep_msg *drep_msg;
2198 int ret;
2199
2200 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2201 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2202 drep_msg->local_comm_id);
2203 if (!cm_id_priv)
2204 return -EINVAL;
2205
2206 work->cm_event.private_data = &drep_msg->private_data;
2207
2208 spin_lock_irq(&cm_id_priv->lock);
2209 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2210 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2211 spin_unlock_irq(&cm_id_priv->lock);
2212 goto out;
2213 }
2214 cm_enter_timewait(cm_id_priv);
2215
2216 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2217 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2218 if (!ret)
2219 list_add_tail(&work->list, &cm_id_priv->work_list);
2220 spin_unlock_irq(&cm_id_priv->lock);
2221
2222 if (ret)
2223 cm_process_work(cm_id_priv, work);
2224 else
2225 cm_deref_id(cm_id_priv);
2226 return 0;
2227 out:
2228 cm_deref_id(cm_id_priv);
2229 return -EINVAL;
2230 }
2231
2232 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2233 enum ib_cm_rej_reason reason,
2234 void *ari,
2235 u8 ari_length,
2236 const void *private_data,
2237 u8 private_data_len)
2238 {
2239 struct cm_id_private *cm_id_priv;
2240 struct ib_mad_send_buf *msg;
2241 unsigned long flags;
2242 int ret;
2243
2244 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2245 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2246 return -EINVAL;
2247
2248 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2249
2250 spin_lock_irqsave(&cm_id_priv->lock, flags);
2251 switch (cm_id->state) {
2252 case IB_CM_REQ_SENT:
2253 case IB_CM_MRA_REQ_RCVD:
2254 case IB_CM_REQ_RCVD:
2255 case IB_CM_MRA_REQ_SENT:
2256 case IB_CM_REP_RCVD:
2257 case IB_CM_MRA_REP_SENT:
2258 ret = cm_alloc_msg(cm_id_priv, &msg);
2259 if (!ret)
2260 cm_format_rej((struct cm_rej_msg *) msg->mad,
2261 cm_id_priv, reason, ari, ari_length,
2262 private_data, private_data_len);
2263
2264 cm_reset_to_idle(cm_id_priv);
2265 break;
2266 case IB_CM_REP_SENT:
2267 case IB_CM_MRA_REP_RCVD:
2268 ret = cm_alloc_msg(cm_id_priv, &msg);
2269 if (!ret)
2270 cm_format_rej((struct cm_rej_msg *) msg->mad,
2271 cm_id_priv, reason, ari, ari_length,
2272 private_data, private_data_len);
2273
2274 cm_enter_timewait(cm_id_priv);
2275 break;
2276 default:
2277 ret = -EINVAL;
2278 goto out;
2279 }
2280
2281 if (ret)
2282 goto out;
2283
2284 ret = ib_post_send_mad(msg, NULL);
2285 if (ret)
2286 cm_free_msg(msg);
2287
2288 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2289 return ret;
2290 }
2291 EXPORT_SYMBOL(ib_send_cm_rej);
2292
2293 static void cm_format_rej_event(struct cm_work *work)
2294 {
2295 struct cm_rej_msg *rej_msg;
2296 struct ib_cm_rej_event_param *param;
2297
2298 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2299 param = &work->cm_event.param.rej_rcvd;
2300 param->ari = rej_msg->ari;
2301 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2302 param->reason = __be16_to_cpu(rej_msg->reason);
2303 work->cm_event.private_data = &rej_msg->private_data;
2304 }
2305
2306 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2307 {
2308 struct cm_timewait_info *timewait_info;
2309 struct cm_id_private *cm_id_priv;
2310 __be32 remote_id;
2311
2312 remote_id = rej_msg->local_comm_id;
2313
2314 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2315 spin_lock_irq(&cm.lock);
2316 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2317 remote_id);
2318 if (!timewait_info) {
2319 spin_unlock_irq(&cm.lock);
2320 return NULL;
2321 }
2322 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2323 (timewait_info->work.local_id ^
2324 cm.random_id_operand));
2325 if (cm_id_priv) {
2326 if (cm_id_priv->id.remote_id == remote_id)
2327 atomic_inc(&cm_id_priv->refcount);
2328 else
2329 cm_id_priv = NULL;
2330 }
2331 spin_unlock_irq(&cm.lock);
2332 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2333 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2334 else
2335 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2336
2337 return cm_id_priv;
2338 }
2339
2340 static int cm_rej_handler(struct cm_work *work)
2341 {
2342 struct cm_id_private *cm_id_priv;
2343 struct cm_rej_msg *rej_msg;
2344 int ret;
2345
2346 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2347 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2348 if (!cm_id_priv)
2349 return -EINVAL;
2350
2351 cm_format_rej_event(work);
2352
2353 spin_lock_irq(&cm_id_priv->lock);
2354 switch (cm_id_priv->id.state) {
2355 case IB_CM_REQ_SENT:
2356 case IB_CM_MRA_REQ_RCVD:
2357 case IB_CM_REP_SENT:
2358 case IB_CM_MRA_REP_RCVD:
2359 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2360 /* fall through */
2361 case IB_CM_REQ_RCVD:
2362 case IB_CM_MRA_REQ_SENT:
2363 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2364 cm_enter_timewait(cm_id_priv);
2365 else
2366 cm_reset_to_idle(cm_id_priv);
2367 break;
2368 case IB_CM_DREQ_SENT:
2369 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2370 /* fall through */
2371 case IB_CM_REP_RCVD:
2372 case IB_CM_MRA_REP_SENT:
2373 cm_enter_timewait(cm_id_priv);
2374 break;
2375 case IB_CM_ESTABLISHED:
2376 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
2377 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
2378 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
2379 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2380 cm_id_priv->msg);
2381 cm_enter_timewait(cm_id_priv);
2382 break;
2383 }
2384 /* fall through */
2385 default:
2386 spin_unlock_irq(&cm_id_priv->lock);
2387 ret = -EINVAL;
2388 goto out;
2389 }
2390
2391 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2392 if (!ret)
2393 list_add_tail(&work->list, &cm_id_priv->work_list);
2394 spin_unlock_irq(&cm_id_priv->lock);
2395
2396 if (ret)
2397 cm_process_work(cm_id_priv, work);
2398 else
2399 cm_deref_id(cm_id_priv);
2400 return 0;
2401 out:
2402 cm_deref_id(cm_id_priv);
2403 return -EINVAL;
2404 }
2405
2406 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2407 u8 service_timeout,
2408 const void *private_data,
2409 u8 private_data_len)
2410 {
2411 struct cm_id_private *cm_id_priv;
2412 struct ib_mad_send_buf *msg;
2413 enum ib_cm_state cm_state;
2414 enum ib_cm_lap_state lap_state;
2415 enum cm_msg_response msg_response;
2416 void *data;
2417 unsigned long flags;
2418 int ret;
2419
2420 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2421 return -EINVAL;
2422
2423 data = cm_copy_private_data(private_data, private_data_len);
2424 if (IS_ERR(data))
2425 return PTR_ERR(data);
2426
2427 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2428
2429 spin_lock_irqsave(&cm_id_priv->lock, flags);
2430 switch(cm_id_priv->id.state) {
2431 case IB_CM_REQ_RCVD:
2432 cm_state = IB_CM_MRA_REQ_SENT;
2433 lap_state = cm_id->lap_state;
2434 msg_response = CM_MSG_RESPONSE_REQ;
2435 break;
2436 case IB_CM_REP_RCVD:
2437 cm_state = IB_CM_MRA_REP_SENT;
2438 lap_state = cm_id->lap_state;
2439 msg_response = CM_MSG_RESPONSE_REP;
2440 break;
2441 case IB_CM_ESTABLISHED:
2442 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
2443 cm_state = cm_id->state;
2444 lap_state = IB_CM_MRA_LAP_SENT;
2445 msg_response = CM_MSG_RESPONSE_OTHER;
2446 break;
2447 }
2448 default:
2449 ret = -EINVAL;
2450 goto error1;
2451 }
2452
2453 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
2454 ret = cm_alloc_msg(cm_id_priv, &msg);
2455 if (ret)
2456 goto error1;
2457
2458 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2459 msg_response, service_timeout,
2460 private_data, private_data_len);
2461 ret = ib_post_send_mad(msg, NULL);
2462 if (ret)
2463 goto error2;
2464 }
2465
2466 cm_id->state = cm_state;
2467 cm_id->lap_state = lap_state;
2468 cm_id_priv->service_timeout = service_timeout;
2469 cm_set_private_data(cm_id_priv, data, private_data_len);
2470 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2471 return 0;
2472
2473 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2474 kfree(data);
2475 return ret;
2476
2477 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2478 kfree(data);
2479 cm_free_msg(msg);
2480 return ret;
2481 }
2482 EXPORT_SYMBOL(ib_send_cm_mra);
2483
2484 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2485 {
2486 switch (cm_mra_get_msg_mraed(mra_msg)) {
2487 case CM_MSG_RESPONSE_REQ:
2488 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2489 case CM_MSG_RESPONSE_REP:
2490 case CM_MSG_RESPONSE_OTHER:
2491 return cm_acquire_id(mra_msg->remote_comm_id,
2492 mra_msg->local_comm_id);
2493 default:
2494 return NULL;
2495 }
2496 }
2497
2498 static int cm_mra_handler(struct cm_work *work)
2499 {
2500 struct cm_id_private *cm_id_priv;
2501 struct cm_mra_msg *mra_msg;
2502 int timeout, ret;
2503
2504 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2505 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2506 if (!cm_id_priv)
2507 return -EINVAL;
2508
2509 work->cm_event.private_data = &mra_msg->private_data;
2510 work->cm_event.param.mra_rcvd.service_timeout =
2511 cm_mra_get_service_timeout(mra_msg);
2512 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2513 cm_convert_to_ms(cm_id_priv->av.timeout);
2514
2515 spin_lock_irq(&cm_id_priv->lock);
2516 switch (cm_id_priv->id.state) {
2517 case IB_CM_REQ_SENT:
2518 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2519 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2520 cm_id_priv->msg, timeout))
2521 goto out;
2522 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2523 break;
2524 case IB_CM_REP_SENT:
2525 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2526 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2527 cm_id_priv->msg, timeout))
2528 goto out;
2529 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2530 break;
2531 case IB_CM_ESTABLISHED:
2532 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2533 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2534 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2535 cm_id_priv->msg, timeout)) {
2536 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2537 atomic_long_inc(&work->port->
2538 counter_group[CM_RECV_DUPLICATES].
2539 counter[CM_MRA_COUNTER]);
2540 goto out;
2541 }
2542 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2543 break;
2544 case IB_CM_MRA_REQ_RCVD:
2545 case IB_CM_MRA_REP_RCVD:
2546 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2547 counter[CM_MRA_COUNTER]);
2548 /* fall through */
2549 default:
2550 goto out;
2551 }
2552
2553 cm_id_priv->msg->context[1] = (void *) (unsigned long)
2554 cm_id_priv->id.state;
2555 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2556 if (!ret)
2557 list_add_tail(&work->list, &cm_id_priv->work_list);
2558 spin_unlock_irq(&cm_id_priv->lock);
2559
2560 if (ret)
2561 cm_process_work(cm_id_priv, work);
2562 else
2563 cm_deref_id(cm_id_priv);
2564 return 0;
2565 out:
2566 spin_unlock_irq(&cm_id_priv->lock);
2567 cm_deref_id(cm_id_priv);
2568 return -EINVAL;
2569 }
2570
2571 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2572 struct cm_id_private *cm_id_priv,
2573 struct ib_sa_path_rec *alternate_path,
2574 const void *private_data,
2575 u8 private_data_len)
2576 {
2577 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2578 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2579 lap_msg->local_comm_id = cm_id_priv->id.local_id;
2580 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2581 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2582 /* todo: need remote CM response timeout */
2583 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2584 lap_msg->alt_local_lid = alternate_path->slid;
2585 lap_msg->alt_remote_lid = alternate_path->dlid;
2586 lap_msg->alt_local_gid = alternate_path->sgid;
2587 lap_msg->alt_remote_gid = alternate_path->dgid;
2588 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2589 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2590 lap_msg->alt_hop_limit = alternate_path->hop_limit;
2591 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2592 cm_lap_set_sl(lap_msg, alternate_path->sl);
2593 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2594 cm_lap_set_local_ack_timeout(lap_msg,
2595 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
2596 alternate_path->packet_life_time));
2597
2598 if (private_data && private_data_len)
2599 memcpy(lap_msg->private_data, private_data, private_data_len);
2600 }
2601
2602 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2603 struct ib_sa_path_rec *alternate_path,
2604 const void *private_data,
2605 u8 private_data_len)
2606 {
2607 struct cm_id_private *cm_id_priv;
2608 struct ib_mad_send_buf *msg;
2609 unsigned long flags;
2610 int ret;
2611
2612 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2613 return -EINVAL;
2614
2615 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2616 spin_lock_irqsave(&cm_id_priv->lock, flags);
2617 if (cm_id->state != IB_CM_ESTABLISHED ||
2618 (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2619 cm_id->lap_state != IB_CM_LAP_IDLE)) {
2620 ret = -EINVAL;
2621 goto out;
2622 }
2623
2624 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
2625 if (ret)
2626 goto out;
2627 cm_id_priv->alt_av.timeout =
2628 cm_ack_timeout(cm_id_priv->target_ack_delay,
2629 cm_id_priv->alt_av.timeout - 1);
2630
2631 ret = cm_alloc_msg(cm_id_priv, &msg);
2632 if (ret)
2633 goto out;
2634
2635 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2636 alternate_path, private_data, private_data_len);
2637 msg->timeout_ms = cm_id_priv->timeout_ms;
2638 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2639
2640 ret = ib_post_send_mad(msg, NULL);
2641 if (ret) {
2642 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2643 cm_free_msg(msg);
2644 return ret;
2645 }
2646
2647 cm_id->lap_state = IB_CM_LAP_SENT;
2648 cm_id_priv->msg = msg;
2649
2650 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2651 return ret;
2652 }
2653 EXPORT_SYMBOL(ib_send_cm_lap);
2654
2655 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2656 struct ib_sa_path_rec *path,
2657 struct cm_lap_msg *lap_msg)
2658 {
2659 memset(path, 0, sizeof *path);
2660 path->dgid = lap_msg->alt_local_gid;
2661 path->sgid = lap_msg->alt_remote_gid;
2662 path->dlid = lap_msg->alt_local_lid;
2663 path->slid = lap_msg->alt_remote_lid;
2664 path->flow_label = cm_lap_get_flow_label(lap_msg);
2665 path->hop_limit = lap_msg->alt_hop_limit;
2666 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2667 path->reversible = 1;
2668 path->pkey = cm_id_priv->pkey;
2669 path->sl = cm_lap_get_sl(lap_msg);
2670 path->mtu_selector = IB_SA_EQ;
2671 path->mtu = cm_id_priv->path_mtu;
2672 path->rate_selector = IB_SA_EQ;
2673 path->rate = cm_lap_get_packet_rate(lap_msg);
2674 path->packet_life_time_selector = IB_SA_EQ;
2675 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2676 path->packet_life_time -= (path->packet_life_time > 0);
2677 }
2678
2679 static int cm_lap_handler(struct cm_work *work)
2680 {
2681 struct cm_id_private *cm_id_priv;
2682 struct cm_lap_msg *lap_msg;
2683 struct ib_cm_lap_event_param *param;
2684 struct ib_mad_send_buf *msg = NULL;
2685 int ret;
2686
2687 /* todo: verify LAP request and send reject APR if invalid. */
2688 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2689 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2690 lap_msg->local_comm_id);
2691 if (!cm_id_priv)
2692 return -EINVAL;
2693
2694 param = &work->cm_event.param.lap_rcvd;
2695 param->alternate_path = &work->path[0];
2696 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
2697 work->cm_event.private_data = &lap_msg->private_data;
2698
2699 spin_lock_irq(&cm_id_priv->lock);
2700 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2701 goto unlock;
2702
2703 switch (cm_id_priv->id.lap_state) {
2704 case IB_CM_LAP_UNINIT:
2705 case IB_CM_LAP_IDLE:
2706 break;
2707 case IB_CM_MRA_LAP_SENT:
2708 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2709 counter[CM_LAP_COUNTER]);
2710 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2711 goto unlock;
2712
2713 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2714 CM_MSG_RESPONSE_OTHER,
2715 cm_id_priv->service_timeout,
2716 cm_id_priv->private_data,
2717 cm_id_priv->private_data_len);
2718 spin_unlock_irq(&cm_id_priv->lock);
2719
2720 if (ib_post_send_mad(msg, NULL))
2721 cm_free_msg(msg);
2722 goto deref;
2723 case IB_CM_LAP_RCVD:
2724 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2725 counter[CM_LAP_COUNTER]);
2726 goto unlock;
2727 default:
2728 goto unlock;
2729 }
2730
2731 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2732 cm_id_priv->tid = lap_msg->hdr.tid;
2733 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2734 work->mad_recv_wc->recv_buf.grh,
2735 &cm_id_priv->av);
2736 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
2737 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2738 if (!ret)
2739 list_add_tail(&work->list, &cm_id_priv->work_list);
2740 spin_unlock_irq(&cm_id_priv->lock);
2741
2742 if (ret)
2743 cm_process_work(cm_id_priv, work);
2744 else
2745 cm_deref_id(cm_id_priv);
2746 return 0;
2747
2748 unlock: spin_unlock_irq(&cm_id_priv->lock);
2749 deref: cm_deref_id(cm_id_priv);
2750 return -EINVAL;
2751 }
2752
2753 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2754 struct cm_id_private *cm_id_priv,
2755 enum ib_cm_apr_status status,
2756 void *info,
2757 u8 info_length,
2758 const void *private_data,
2759 u8 private_data_len)
2760 {
2761 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2762 apr_msg->local_comm_id = cm_id_priv->id.local_id;
2763 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2764 apr_msg->ap_status = (u8) status;
2765
2766 if (info && info_length) {
2767 apr_msg->info_length = info_length;
2768 memcpy(apr_msg->info, info, info_length);
2769 }
2770
2771 if (private_data && private_data_len)
2772 memcpy(apr_msg->private_data, private_data, private_data_len);
2773 }
2774
2775 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2776 enum ib_cm_apr_status status,
2777 void *info,
2778 u8 info_length,
2779 const void *private_data,
2780 u8 private_data_len)
2781 {
2782 struct cm_id_private *cm_id_priv;
2783 struct ib_mad_send_buf *msg;
2784 unsigned long flags;
2785 int ret;
2786
2787 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2788 (info && info_length > IB_CM_APR_INFO_LENGTH))
2789 return -EINVAL;
2790
2791 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2792 spin_lock_irqsave(&cm_id_priv->lock, flags);
2793 if (cm_id->state != IB_CM_ESTABLISHED ||
2794 (cm_id->lap_state != IB_CM_LAP_RCVD &&
2795 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2796 ret = -EINVAL;
2797 goto out;
2798 }
2799
2800 ret = cm_alloc_msg(cm_id_priv, &msg);
2801 if (ret)
2802 goto out;
2803
2804 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2805 info, info_length, private_data, private_data_len);
2806 ret = ib_post_send_mad(msg, NULL);
2807 if (ret) {
2808 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2809 cm_free_msg(msg);
2810 return ret;
2811 }
2812
2813 cm_id->lap_state = IB_CM_LAP_IDLE;
2814 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2815 return ret;
2816 }
2817 EXPORT_SYMBOL(ib_send_cm_apr);
2818
2819 static int cm_apr_handler(struct cm_work *work)
2820 {
2821 struct cm_id_private *cm_id_priv;
2822 struct cm_apr_msg *apr_msg;
2823 int ret;
2824
2825 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2826 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2827 apr_msg->local_comm_id);
2828 if (!cm_id_priv)
2829 return -EINVAL; /* Unmatched reply. */
2830
2831 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2832 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2833 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2834 work->cm_event.private_data = &apr_msg->private_data;
2835
2836 spin_lock_irq(&cm_id_priv->lock);
2837 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2838 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2839 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2840 spin_unlock_irq(&cm_id_priv->lock);
2841 goto out;
2842 }
2843 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2844 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2845 cm_id_priv->msg = NULL;
2846
2847 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2848 if (!ret)
2849 list_add_tail(&work->list, &cm_id_priv->work_list);
2850 spin_unlock_irq(&cm_id_priv->lock);
2851
2852 if (ret)
2853 cm_process_work(cm_id_priv, work);
2854 else
2855 cm_deref_id(cm_id_priv);
2856 return 0;
2857 out:
2858 cm_deref_id(cm_id_priv);
2859 return -EINVAL;
2860 }
2861
2862 static int cm_timewait_handler(struct cm_work *work)
2863 {
2864 struct cm_timewait_info *timewait_info;
2865 struct cm_id_private *cm_id_priv;
2866 int ret;
2867
2868 timewait_info = (struct cm_timewait_info *)work;
2869 spin_lock_irq(&cm.lock);
2870 list_del(&timewait_info->list);
2871 spin_unlock_irq(&cm.lock);
2872
2873 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2874 timewait_info->work.remote_id);
2875 if (!cm_id_priv)
2876 return -EINVAL;
2877
2878 spin_lock_irq(&cm_id_priv->lock);
2879 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2880 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2881 spin_unlock_irq(&cm_id_priv->lock);
2882 goto out;
2883 }
2884 cm_id_priv->id.state = IB_CM_IDLE;
2885 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2886 if (!ret)
2887 list_add_tail(&work->list, &cm_id_priv->work_list);
2888 spin_unlock_irq(&cm_id_priv->lock);
2889
2890 if (ret)
2891 cm_process_work(cm_id_priv, work);
2892 else
2893 cm_deref_id(cm_id_priv);
2894 return 0;
2895 out:
2896 cm_deref_id(cm_id_priv);
2897 return -EINVAL;
2898 }
2899
2900 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2901 struct cm_id_private *cm_id_priv,
2902 struct ib_cm_sidr_req_param *param)
2903 {
2904 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2905 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2906 sidr_req_msg->request_id = cm_id_priv->id.local_id;
2907 sidr_req_msg->pkey = param->path->pkey;
2908 sidr_req_msg->service_id = param->service_id;
2909
2910 if (param->private_data && param->private_data_len)
2911 memcpy(sidr_req_msg->private_data, param->private_data,
2912 param->private_data_len);
2913 }
2914
2915 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2916 struct ib_cm_sidr_req_param *param)
2917 {
2918 struct cm_id_private *cm_id_priv;
2919 struct ib_mad_send_buf *msg;
2920 unsigned long flags;
2921 int ret;
2922
2923 if (!param->path || (param->private_data &&
2924 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2925 return -EINVAL;
2926
2927 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2928 ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2929 if (ret)
2930 goto out;
2931
2932 cm_id->service_id = param->service_id;
2933 cm_id->service_mask = ~cpu_to_be64(0);
2934 cm_id_priv->timeout_ms = param->timeout_ms;
2935 cm_id_priv->max_cm_retries = param->max_cm_retries;
2936 ret = cm_alloc_msg(cm_id_priv, &msg);
2937 if (ret)
2938 goto out;
2939
2940 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2941 param);
2942 msg->timeout_ms = cm_id_priv->timeout_ms;
2943 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2944
2945 spin_lock_irqsave(&cm_id_priv->lock, flags);
2946 if (cm_id->state == IB_CM_IDLE)
2947 ret = ib_post_send_mad(msg, NULL);
2948 else
2949 ret = -EINVAL;
2950
2951 if (ret) {
2952 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2953 cm_free_msg(msg);
2954 goto out;
2955 }
2956 cm_id->state = IB_CM_SIDR_REQ_SENT;
2957 cm_id_priv->msg = msg;
2958 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2959 out:
2960 return ret;
2961 }
2962 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2963
2964 static void cm_format_sidr_req_event(struct cm_work *work,
2965 struct ib_cm_id *listen_id)
2966 {
2967 struct cm_sidr_req_msg *sidr_req_msg;
2968 struct ib_cm_sidr_req_event_param *param;
2969
2970 sidr_req_msg = (struct cm_sidr_req_msg *)
2971 work->mad_recv_wc->recv_buf.mad;
2972 param = &work->cm_event.param.sidr_req_rcvd;
2973 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2974 param->listen_id = listen_id;
2975 param->port = work->port->port_num;
2976 work->cm_event.private_data = &sidr_req_msg->private_data;
2977 }
2978
2979 static int cm_sidr_req_handler(struct cm_work *work)
2980 {
2981 struct ib_cm_id *cm_id;
2982 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2983 struct cm_sidr_req_msg *sidr_req_msg;
2984 struct ib_wc *wc;
2985
2986 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
2987 if (IS_ERR(cm_id))
2988 return PTR_ERR(cm_id);
2989 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2990
2991 /* Record SGID/SLID and request ID for lookup. */
2992 sidr_req_msg = (struct cm_sidr_req_msg *)
2993 work->mad_recv_wc->recv_buf.mad;
2994 wc = work->mad_recv_wc->wc;
2995 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
2996 cm_id_priv->av.dgid.global.interface_id = 0;
2997 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2998 work->mad_recv_wc->recv_buf.grh,
2999 &cm_id_priv->av);
3000 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
3001 cm_id_priv->tid = sidr_req_msg->hdr.tid;
3002 atomic_inc(&cm_id_priv->work_count);
3003
3004 spin_lock_irq(&cm.lock);
3005 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3006 if (cur_cm_id_priv) {
3007 spin_unlock_irq(&cm.lock);
3008 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3009 counter[CM_SIDR_REQ_COUNTER]);
3010 goto out; /* Duplicate message. */
3011 }
3012 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3013 cur_cm_id_priv = cm_find_listen(cm_id->device,
3014 sidr_req_msg->service_id,
3015 sidr_req_msg->private_data);
3016 if (!cur_cm_id_priv) {
3017 spin_unlock_irq(&cm.lock);
3018 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED);
3019 goto out; /* No match. */
3020 }
3021 atomic_inc(&cur_cm_id_priv->refcount);
3022 atomic_inc(&cm_id_priv->refcount);
3023 spin_unlock_irq(&cm.lock);
3024
3025 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
3026 cm_id_priv->id.context = cur_cm_id_priv->id.context;
3027 cm_id_priv->id.service_id = sidr_req_msg->service_id;
3028 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3029
3030 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
3031 cm_process_work(cm_id_priv, work);
3032 cm_deref_id(cur_cm_id_priv);
3033 return 0;
3034 out:
3035 ib_destroy_cm_id(&cm_id_priv->id);
3036 return -EINVAL;
3037 }
3038
3039 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3040 struct cm_id_private *cm_id_priv,
3041 struct ib_cm_sidr_rep_param *param)
3042 {
3043 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3044 cm_id_priv->tid);
3045 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
3046 sidr_rep_msg->status = param->status;
3047 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
3048 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
3049 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
3050
3051 if (param->info && param->info_length)
3052 memcpy(sidr_rep_msg->info, param->info, param->info_length);
3053
3054 if (param->private_data && param->private_data_len)
3055 memcpy(sidr_rep_msg->private_data, param->private_data,
3056 param->private_data_len);
3057 }
3058
3059 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3060 struct ib_cm_sidr_rep_param *param)
3061 {
3062 struct cm_id_private *cm_id_priv;
3063 struct ib_mad_send_buf *msg;
3064 unsigned long flags;
3065 int ret;
3066
3067 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3068 (param->private_data &&
3069 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3070 return -EINVAL;
3071
3072 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3073 spin_lock_irqsave(&cm_id_priv->lock, flags);
3074 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
3075 ret = -EINVAL;
3076 goto error;
3077 }
3078
3079 ret = cm_alloc_msg(cm_id_priv, &msg);
3080 if (ret)
3081 goto error;
3082
3083 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3084 param);
3085 ret = ib_post_send_mad(msg, NULL);
3086 if (ret) {
3087 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3088 cm_free_msg(msg);
3089 return ret;
3090 }
3091 cm_id->state = IB_CM_IDLE;
3092 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3093
3094 spin_lock_irqsave(&cm.lock, flags);
3095 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3096 spin_unlock_irqrestore(&cm.lock, flags);
3097 return 0;
3098
3099 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3100 return ret;
3101 }
3102 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3103
3104 static void cm_format_sidr_rep_event(struct cm_work *work)
3105 {
3106 struct cm_sidr_rep_msg *sidr_rep_msg;
3107 struct ib_cm_sidr_rep_event_param *param;
3108
3109 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3110 work->mad_recv_wc->recv_buf.mad;
3111 param = &work->cm_event.param.sidr_rep_rcvd;
3112 param->status = sidr_rep_msg->status;
3113 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
3114 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
3115 param->info = &sidr_rep_msg->info;
3116 param->info_len = sidr_rep_msg->info_length;
3117 work->cm_event.private_data = &sidr_rep_msg->private_data;
3118 }
3119
3120 static int cm_sidr_rep_handler(struct cm_work *work)
3121 {
3122 struct cm_sidr_rep_msg *sidr_rep_msg;
3123 struct cm_id_private *cm_id_priv;
3124
3125 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3126 work->mad_recv_wc->recv_buf.mad;
3127 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
3128 if (!cm_id_priv)
3129 return -EINVAL; /* Unmatched reply. */
3130
3131 spin_lock_irq(&cm_id_priv->lock);
3132 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3133 spin_unlock_irq(&cm_id_priv->lock);
3134 goto out;
3135 }
3136 cm_id_priv->id.state = IB_CM_IDLE;
3137 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3138 spin_unlock_irq(&cm_id_priv->lock);
3139
3140 cm_format_sidr_rep_event(work);
3141 cm_process_work(cm_id_priv, work);
3142 return 0;
3143 out:
3144 cm_deref_id(cm_id_priv);
3145 return -EINVAL;
3146 }
3147
3148 static void cm_process_send_error(struct ib_mad_send_buf *msg,
3149 enum ib_wc_status wc_status)
3150 {
3151 struct cm_id_private *cm_id_priv;
3152 struct ib_cm_event cm_event;
3153 enum ib_cm_state state;
3154 int ret;
3155
3156 memset(&cm_event, 0, sizeof cm_event);
3157 cm_id_priv = msg->context[0];
3158
3159 /* Discard old sends or ones without a response. */
3160 spin_lock_irq(&cm_id_priv->lock);
3161 state = (enum ib_cm_state) (unsigned long) msg->context[1];
3162 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3163 goto discard;
3164
3165 switch (state) {
3166 case IB_CM_REQ_SENT:
3167 case IB_CM_MRA_REQ_RCVD:
3168 cm_reset_to_idle(cm_id_priv);
3169 cm_event.event = IB_CM_REQ_ERROR;
3170 break;
3171 case IB_CM_REP_SENT:
3172 case IB_CM_MRA_REP_RCVD:
3173 cm_reset_to_idle(cm_id_priv);
3174 cm_event.event = IB_CM_REP_ERROR;
3175 break;
3176 case IB_CM_DREQ_SENT:
3177 cm_enter_timewait(cm_id_priv);
3178 cm_event.event = IB_CM_DREQ_ERROR;
3179 break;
3180 case IB_CM_SIDR_REQ_SENT:
3181 cm_id_priv->id.state = IB_CM_IDLE;
3182 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3183 break;
3184 default:
3185 goto discard;
3186 }
3187 spin_unlock_irq(&cm_id_priv->lock);
3188 cm_event.param.send_status = wc_status;
3189
3190 /* No other events can occur on the cm_id at this point. */
3191 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3192 cm_free_msg(msg);
3193 if (ret)
3194 ib_destroy_cm_id(&cm_id_priv->id);
3195 return;
3196 discard:
3197 spin_unlock_irq(&cm_id_priv->lock);
3198 cm_free_msg(msg);
3199 }
3200
3201 static void cm_send_handler(struct ib_mad_agent *mad_agent,
3202 struct ib_mad_send_wc *mad_send_wc)
3203 {
3204 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3205 struct cm_port *port;
3206 u16 attr_index;
3207
3208 port = mad_agent->context;
3209 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3210 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3211
3212 /*
3213 * If the send was in response to a received message (context[0] is not
3214 * set to a cm_id), and is not a REJ, then it is a send that was
3215 * manually retried.
3216 */
3217 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3218 msg->retries = 1;
3219
3220 atomic_long_add(1 + msg->retries,
3221 &port->counter_group[CM_XMIT].counter[attr_index]);
3222 if (msg->retries)
3223 atomic_long_add(msg->retries,
3224 &port->counter_group[CM_XMIT_RETRIES].
3225 counter[attr_index]);
3226
3227 switch (mad_send_wc->status) {
3228 case IB_WC_SUCCESS:
3229 case IB_WC_WR_FLUSH_ERR:
3230 cm_free_msg(msg);
3231 break;
3232 default:
3233 if (msg->context[0] && msg->context[1])
3234 cm_process_send_error(msg, mad_send_wc->status);
3235 else
3236 cm_free_msg(msg);
3237 break;
3238 }
3239 }
3240
3241 static void cm_work_handler(struct work_struct *_work)
3242 {
3243 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3244 int ret;
3245
3246 switch (work->cm_event.event) {
3247 case IB_CM_REQ_RECEIVED:
3248 ret = cm_req_handler(work);
3249 break;
3250 case IB_CM_MRA_RECEIVED:
3251 ret = cm_mra_handler(work);
3252 break;
3253 case IB_CM_REJ_RECEIVED:
3254 ret = cm_rej_handler(work);
3255 break;
3256 case IB_CM_REP_RECEIVED:
3257 ret = cm_rep_handler(work);
3258 break;
3259 case IB_CM_RTU_RECEIVED:
3260 ret = cm_rtu_handler(work);
3261 break;
3262 case IB_CM_USER_ESTABLISHED:
3263 ret = cm_establish_handler(work);
3264 break;
3265 case IB_CM_DREQ_RECEIVED:
3266 ret = cm_dreq_handler(work);
3267 break;
3268 case IB_CM_DREP_RECEIVED:
3269 ret = cm_drep_handler(work);
3270 break;
3271 case IB_CM_SIDR_REQ_RECEIVED:
3272 ret = cm_sidr_req_handler(work);
3273 break;
3274 case IB_CM_SIDR_REP_RECEIVED:
3275 ret = cm_sidr_rep_handler(work);
3276 break;
3277 case IB_CM_LAP_RECEIVED:
3278 ret = cm_lap_handler(work);
3279 break;
3280 case IB_CM_APR_RECEIVED:
3281 ret = cm_apr_handler(work);
3282 break;
3283 case IB_CM_TIMEWAIT_EXIT:
3284 ret = cm_timewait_handler(work);
3285 break;
3286 default:
3287 ret = -EINVAL;
3288 break;
3289 }
3290 if (ret)
3291 cm_free_work(work);
3292 }
3293
3294 static int cm_establish(struct ib_cm_id *cm_id)
3295 {
3296 struct cm_id_private *cm_id_priv;
3297 struct cm_work *work;
3298 unsigned long flags;
3299 int ret = 0;
3300
3301 work = kmalloc(sizeof *work, GFP_ATOMIC);
3302 if (!work)
3303 return -ENOMEM;
3304
3305 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3306 spin_lock_irqsave(&cm_id_priv->lock, flags);
3307 switch (cm_id->state)
3308 {
3309 case IB_CM_REP_SENT:
3310 case IB_CM_MRA_REP_RCVD:
3311 cm_id->state = IB_CM_ESTABLISHED;
3312 break;
3313 case IB_CM_ESTABLISHED:
3314 ret = -EISCONN;
3315 break;
3316 default:
3317 ret = -EINVAL;
3318 break;
3319 }
3320 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3321
3322 if (ret) {
3323 kfree(work);
3324 goto out;
3325 }
3326
3327 /*
3328 * The CM worker thread may try to destroy the cm_id before it
3329 * can execute this work item. To prevent potential deadlock,
3330 * we need to find the cm_id once we're in the context of the
3331 * worker thread, rather than holding a reference on it.
3332 */
3333 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3334 work->local_id = cm_id->local_id;
3335 work->remote_id = cm_id->remote_id;
3336 work->mad_recv_wc = NULL;
3337 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3338 queue_delayed_work(cm.wq, &work->work, 0);
3339 out:
3340 return ret;
3341 }
3342
3343 static int cm_migrate(struct ib_cm_id *cm_id)
3344 {
3345 struct cm_id_private *cm_id_priv;
3346 unsigned long flags;
3347 int ret = 0;
3348
3349 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3350 spin_lock_irqsave(&cm_id_priv->lock, flags);
3351 if (cm_id->state == IB_CM_ESTABLISHED &&
3352 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3353 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3354 cm_id->lap_state = IB_CM_LAP_IDLE;
3355 cm_id_priv->av = cm_id_priv->alt_av;
3356 } else
3357 ret = -EINVAL;
3358 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3359
3360 return ret;
3361 }
3362
3363 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3364 {
3365 int ret;
3366
3367 switch (event) {
3368 case IB_EVENT_COMM_EST:
3369 ret = cm_establish(cm_id);
3370 break;
3371 case IB_EVENT_PATH_MIG:
3372 ret = cm_migrate(cm_id);
3373 break;
3374 default:
3375 ret = -EINVAL;
3376 }
3377 return ret;
3378 }
3379 EXPORT_SYMBOL(ib_cm_notify);
3380
3381 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3382 struct ib_mad_recv_wc *mad_recv_wc)
3383 {
3384 struct cm_port *port = mad_agent->context;
3385 struct cm_work *work;
3386 enum ib_cm_event_type event;
3387 u16 attr_id;
3388 int paths = 0;
3389
3390 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3391 case CM_REQ_ATTR_ID:
3392 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3393 alt_local_lid != 0);
3394 event = IB_CM_REQ_RECEIVED;
3395 break;
3396 case CM_MRA_ATTR_ID:
3397 event = IB_CM_MRA_RECEIVED;
3398 break;
3399 case CM_REJ_ATTR_ID:
3400 event = IB_CM_REJ_RECEIVED;
3401 break;
3402 case CM_REP_ATTR_ID:
3403 event = IB_CM_REP_RECEIVED;
3404 break;
3405 case CM_RTU_ATTR_ID:
3406 event = IB_CM_RTU_RECEIVED;
3407 break;
3408 case CM_DREQ_ATTR_ID:
3409 event = IB_CM_DREQ_RECEIVED;
3410 break;
3411 case CM_DREP_ATTR_ID:
3412 event = IB_CM_DREP_RECEIVED;
3413 break;
3414 case CM_SIDR_REQ_ATTR_ID:
3415 event = IB_CM_SIDR_REQ_RECEIVED;
3416 break;
3417 case CM_SIDR_REP_ATTR_ID:
3418 event = IB_CM_SIDR_REP_RECEIVED;
3419 break;
3420 case CM_LAP_ATTR_ID:
3421 paths = 1;
3422 event = IB_CM_LAP_RECEIVED;
3423 break;
3424 case CM_APR_ATTR_ID:
3425 event = IB_CM_APR_RECEIVED;
3426 break;
3427 default:
3428 ib_free_recv_mad(mad_recv_wc);
3429 return;
3430 }
3431
3432 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
3433 atomic_long_inc(&port->counter_group[CM_RECV].
3434 counter[attr_id - CM_ATTR_ID_OFFSET]);
3435
3436 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3437 GFP_KERNEL);
3438 if (!work) {
3439 ib_free_recv_mad(mad_recv_wc);
3440 return;
3441 }
3442
3443 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3444 work->cm_event.event = event;
3445 work->mad_recv_wc = mad_recv_wc;
3446 work->port = port;
3447 queue_delayed_work(cm.wq, &work->work, 0);
3448 }
3449
3450 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3451 struct ib_qp_attr *qp_attr,
3452 int *qp_attr_mask)
3453 {
3454 unsigned long flags;
3455 int ret;
3456
3457 spin_lock_irqsave(&cm_id_priv->lock, flags);
3458 switch (cm_id_priv->id.state) {
3459 case IB_CM_REQ_SENT:
3460 case IB_CM_MRA_REQ_RCVD:
3461 case IB_CM_REQ_RCVD:
3462 case IB_CM_MRA_REQ_SENT:
3463 case IB_CM_REP_RCVD:
3464 case IB_CM_MRA_REP_SENT:
3465 case IB_CM_REP_SENT:
3466 case IB_CM_MRA_REP_RCVD:
3467 case IB_CM_ESTABLISHED:
3468 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3469 IB_QP_PKEY_INDEX | IB_QP_PORT;
3470 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
3471 if (cm_id_priv->responder_resources)
3472 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3473 IB_ACCESS_REMOTE_ATOMIC;
3474 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3475 qp_attr->port_num = cm_id_priv->av.port->port_num;
3476 ret = 0;
3477 break;
3478 default:
3479 ret = -EINVAL;
3480 break;
3481 }
3482 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3483 return ret;
3484 }
3485
3486 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3487 struct ib_qp_attr *qp_attr,
3488 int *qp_attr_mask)
3489 {
3490 unsigned long flags;
3491 int ret;
3492
3493 spin_lock_irqsave(&cm_id_priv->lock, flags);
3494 switch (cm_id_priv->id.state) {
3495 case IB_CM_REQ_RCVD:
3496 case IB_CM_MRA_REQ_SENT:
3497 case IB_CM_REP_RCVD:
3498 case IB_CM_MRA_REP_SENT:
3499 case IB_CM_REP_SENT:
3500 case IB_CM_MRA_REP_RCVD:
3501 case IB_CM_ESTABLISHED:
3502 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3503 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3504 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3505 qp_attr->path_mtu = cm_id_priv->path_mtu;
3506 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3507 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3508 if (cm_id_priv->qp_type == IB_QPT_RC ||
3509 cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
3510 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3511 IB_QP_MIN_RNR_TIMER;
3512 qp_attr->max_dest_rd_atomic =
3513 cm_id_priv->responder_resources;
3514 qp_attr->min_rnr_timer = 0;
3515 }
3516 if (cm_id_priv->alt_av.ah_attr.dlid) {
3517 *qp_attr_mask |= IB_QP_ALT_PATH;
3518 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3519 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3520 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3521 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3522 }
3523 ret = 0;
3524 break;
3525 default:
3526 ret = -EINVAL;
3527 break;
3528 }
3529 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3530 return ret;
3531 }
3532
3533 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3534 struct ib_qp_attr *qp_attr,
3535 int *qp_attr_mask)
3536 {
3537 unsigned long flags;
3538 int ret;
3539
3540 spin_lock_irqsave(&cm_id_priv->lock, flags);
3541 switch (cm_id_priv->id.state) {
3542 /* Allow transition to RTS before sending REP */
3543 case IB_CM_REQ_RCVD:
3544 case IB_CM_MRA_REQ_SENT:
3545
3546 case IB_CM_REP_RCVD:
3547 case IB_CM_MRA_REP_SENT:
3548 case IB_CM_REP_SENT:
3549 case IB_CM_MRA_REP_RCVD:
3550 case IB_CM_ESTABLISHED:
3551 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
3552 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3553 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3554 switch (cm_id_priv->qp_type) {
3555 case IB_QPT_RC:
3556 case IB_QPT_XRC_INI:
3557 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
3558 IB_QP_MAX_QP_RD_ATOMIC;
3559 qp_attr->retry_cnt = cm_id_priv->retry_count;
3560 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3561 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3562 /* fall through */
3563 case IB_QPT_XRC_TGT:
3564 *qp_attr_mask |= IB_QP_TIMEOUT;
3565 qp_attr->timeout = cm_id_priv->av.timeout;
3566 break;
3567 default:
3568 break;
3569 }
3570 if (cm_id_priv->alt_av.ah_attr.dlid) {
3571 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3572 qp_attr->path_mig_state = IB_MIG_REARM;
3573 }
3574 } else {
3575 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
3576 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3577 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3578 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3579 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3580 qp_attr->path_mig_state = IB_MIG_REARM;
3581 }
3582 ret = 0;
3583 break;
3584 default:
3585 ret = -EINVAL;
3586 break;
3587 }
3588 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3589 return ret;
3590 }
3591
3592 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3593 struct ib_qp_attr *qp_attr,
3594 int *qp_attr_mask)
3595 {
3596 struct cm_id_private *cm_id_priv;
3597 int ret;
3598
3599 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3600 switch (qp_attr->qp_state) {
3601 case IB_QPS_INIT:
3602 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3603 break;
3604 case IB_QPS_RTR:
3605 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3606 break;
3607 case IB_QPS_RTS:
3608 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3609 break;
3610 default:
3611 ret = -EINVAL;
3612 break;
3613 }
3614 return ret;
3615 }
3616 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3617
3618 static void cm_get_ack_delay(struct cm_device *cm_dev)
3619 {
3620 struct ib_device_attr attr;
3621
3622 if (ib_query_device(cm_dev->ib_device, &attr))
3623 cm_dev->ack_delay = 0; /* acks will rely on packet life time */
3624 else
3625 cm_dev->ack_delay = attr.local_ca_ack_delay;
3626 }
3627
3628 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
3629 char *buf)
3630 {
3631 struct cm_counter_group *group;
3632 struct cm_counter_attribute *cm_attr;
3633
3634 group = container_of(obj, struct cm_counter_group, obj);
3635 cm_attr = container_of(attr, struct cm_counter_attribute, attr);
3636
3637 return sprintf(buf, "%ld\n",
3638 atomic_long_read(&group->counter[cm_attr->index]));
3639 }
3640
3641 static const struct sysfs_ops cm_counter_ops = {
3642 .show = cm_show_counter
3643 };
3644
3645 static struct kobj_type cm_counter_obj_type = {
3646 .sysfs_ops = &cm_counter_ops,
3647 .default_attrs = cm_counter_default_attrs
3648 };
3649
3650 static void cm_release_port_obj(struct kobject *obj)
3651 {
3652 struct cm_port *cm_port;
3653
3654 cm_port = container_of(obj, struct cm_port, port_obj);
3655 kfree(cm_port);
3656 }
3657
3658 static struct kobj_type cm_port_obj_type = {
3659 .release = cm_release_port_obj
3660 };
3661
3662 static char *cm_devnode(struct device *dev, mode_t *mode)
3663 {
3664 if (mode)
3665 *mode = 0666;
3666 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
3667 }
3668
3669 struct class cm_class = {
3670 .owner = THIS_MODULE,
3671 .name = "infiniband_cm",
3672 .devnode = cm_devnode,
3673 };
3674 EXPORT_SYMBOL(cm_class);
3675
3676 static int cm_create_port_fs(struct cm_port *port)
3677 {
3678 int i, ret;
3679
3680 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type,
3681 &port->cm_dev->device->kobj,
3682 "%d", port->port_num);
3683 if (ret) {
3684 kfree(port);
3685 return ret;
3686 }
3687
3688 for (i = 0; i < CM_COUNTER_GROUPS; i++) {
3689 ret = kobject_init_and_add(&port->counter_group[i].obj,
3690 &cm_counter_obj_type,
3691 &port->port_obj,
3692 "%s", counter_group_names[i]);
3693 if (ret)
3694 goto error;
3695 }
3696
3697 return 0;
3698
3699 error:
3700 while (i--)
3701 kobject_put(&port->counter_group[i].obj);
3702 kobject_put(&port->port_obj);
3703 return ret;
3704
3705 }
3706
3707 static void cm_remove_port_fs(struct cm_port *port)
3708 {
3709 int i;
3710
3711 for (i = 0; i < CM_COUNTER_GROUPS; i++)
3712 kobject_put(&port->counter_group[i].obj);
3713
3714 kobject_put(&port->port_obj);
3715 }
3716
3717 static void cm_add_one(struct ib_device *ib_device)
3718 {
3719 struct cm_device *cm_dev;
3720 struct cm_port *port;
3721 struct ib_mad_reg_req reg_req = {
3722 .mgmt_class = IB_MGMT_CLASS_CM,
3723 .mgmt_class_version = IB_CM_CLASS_VERSION
3724 };
3725 struct ib_port_modify port_modify = {
3726 .set_port_cap_mask = IB_PORT_CM_SUP
3727 };
3728 unsigned long flags;
3729 int ret;
3730 u8 i;
3731
3732 if (rdma_node_get_transport(ib_device->node_type) != RDMA_TRANSPORT_IB)
3733 return;
3734
3735 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) *
3736 ib_device->phys_port_cnt, GFP_KERNEL);
3737 if (!cm_dev)
3738 return;
3739
3740 cm_dev->ib_device = ib_device;
3741 cm_get_ack_delay(cm_dev);
3742
3743 cm_dev->device = device_create(&cm_class, &ib_device->dev,
3744 MKDEV(0, 0), NULL,
3745 "%s", ib_device->name);
3746 if (IS_ERR(cm_dev->device)) {
3747 kfree(cm_dev);
3748 return;
3749 }
3750
3751 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3752 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3753 port = kzalloc(sizeof *port, GFP_KERNEL);
3754 if (!port)
3755 goto error1;
3756
3757 cm_dev->port[i-1] = port;
3758 port->cm_dev = cm_dev;
3759 port->port_num = i;
3760
3761 ret = cm_create_port_fs(port);
3762 if (ret)
3763 goto error1;
3764
3765 port->mad_agent = ib_register_mad_agent(ib_device, i,
3766 IB_QPT_GSI,
3767 &reg_req,
3768 0,
3769 cm_send_handler,
3770 cm_recv_handler,
3771 port);
3772 if (IS_ERR(port->mad_agent))
3773 goto error2;
3774
3775 ret = ib_modify_port(ib_device, i, 0, &port_modify);
3776 if (ret)
3777 goto error3;
3778 }
3779 ib_set_client_data(ib_device, &cm_client, cm_dev);
3780
3781 write_lock_irqsave(&cm.device_lock, flags);
3782 list_add_tail(&cm_dev->list, &cm.device_list);
3783 write_unlock_irqrestore(&cm.device_lock, flags);
3784 return;
3785
3786 error3:
3787 ib_unregister_mad_agent(port->mad_agent);
3788 error2:
3789 cm_remove_port_fs(port);
3790 error1:
3791 port_modify.set_port_cap_mask = 0;
3792 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3793 while (--i) {
3794 port = cm_dev->port[i-1];
3795 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3796 ib_unregister_mad_agent(port->mad_agent);
3797 cm_remove_port_fs(port);
3798 }
3799 device_unregister(cm_dev->device);
3800 kfree(cm_dev);
3801 }
3802
3803 static void cm_remove_one(struct ib_device *ib_device)
3804 {
3805 struct cm_device *cm_dev;
3806 struct cm_port *port;
3807 struct ib_port_modify port_modify = {
3808 .clr_port_cap_mask = IB_PORT_CM_SUP
3809 };
3810 unsigned long flags;
3811 int i;
3812
3813 cm_dev = ib_get_client_data(ib_device, &cm_client);
3814 if (!cm_dev)
3815 return;
3816
3817 write_lock_irqsave(&cm.device_lock, flags);
3818 list_del(&cm_dev->list);
3819 write_unlock_irqrestore(&cm.device_lock, flags);
3820
3821 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3822 port = cm_dev->port[i-1];
3823 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3824 ib_unregister_mad_agent(port->mad_agent);
3825 flush_workqueue(cm.wq);
3826 cm_remove_port_fs(port);
3827 }
3828 device_unregister(cm_dev->device);
3829 kfree(cm_dev);
3830 }
3831
3832 static int __init ib_cm_init(void)
3833 {
3834 int ret;
3835
3836 memset(&cm, 0, sizeof cm);
3837 INIT_LIST_HEAD(&cm.device_list);
3838 rwlock_init(&cm.device_lock);
3839 spin_lock_init(&cm.lock);
3840 cm.listen_service_table = RB_ROOT;
3841 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3842 cm.remote_id_table = RB_ROOT;
3843 cm.remote_qp_table = RB_ROOT;
3844 cm.remote_sidr_table = RB_ROOT;
3845 idr_init(&cm.local_id_table);
3846 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3847 idr_pre_get(&cm.local_id_table, GFP_KERNEL);
3848 INIT_LIST_HEAD(&cm.timewait_list);
3849
3850 ret = class_register(&cm_class);
3851 if (ret)
3852 return -ENOMEM;
3853
3854 cm.wq = create_workqueue("ib_cm");
3855 if (!cm.wq) {
3856 ret = -ENOMEM;
3857 goto error1;
3858 }
3859
3860 ret = ib_register_client(&cm_client);
3861 if (ret)
3862 goto error2;
3863
3864 return 0;
3865 error2:
3866 destroy_workqueue(cm.wq);
3867 error1:
3868 class_unregister(&cm_class);
3869 return ret;
3870 }
3871
3872 static void __exit ib_cm_cleanup(void)
3873 {
3874 struct cm_timewait_info *timewait_info, *tmp;
3875
3876 spin_lock_irq(&cm.lock);
3877 list_for_each_entry(timewait_info, &cm.timewait_list, list)
3878 cancel_delayed_work(&timewait_info->work.work);
3879 spin_unlock_irq(&cm.lock);
3880
3881 ib_unregister_client(&cm_client);
3882 destroy_workqueue(cm.wq);
3883
3884 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
3885 list_del(&timewait_info->list);
3886 kfree(timewait_info);
3887 }
3888
3889 class_unregister(&cm_class);
3890 idr_destroy(&cm.local_id_table);
3891 }
3892
3893 module_init(ib_cm_init);
3894 module_exit(ib_cm_cleanup);
3895
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