1 /*
2 * Copyright (c) 2004-2007 Intel Corporation. All rights reserved.
3 * Copyright (c) 2004 Topspin Corporation. All rights reserved.
4 * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved.
5 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 */
35
36 #include <linux/completion.h>
37 #include <linux/dma-mapping.h>
38 #include <linux/device.h>
39 #include <linux/module.h>
40 #include <linux/err.h>
41 #include <linux/idr.h>
42 #include <linux/interrupt.h>
43 #include <linux/random.h>
44 #include <linux/rbtree.h>
45 #include <linux/spinlock.h>
46 #include <linux/slab.h>
47 #include <linux/sysfs.h>
48 #include <linux/workqueue.h>
49 #include <linux/kdev_t.h>
50 #include <linux/etherdevice.h>
51
52 #include <rdma/ib_cache.h>
53 #include <rdma/ib_cm.h>
54 #include "cm_msgs.h"
55
56 MODULE_AUTHOR("Sean Hefty");
57 MODULE_DESCRIPTION("InfiniBand CM");
58 MODULE_LICENSE("Dual BSD/GPL");
59
60 static void cm_add_one(struct ib_device *device);
61 static void cm_remove_one(struct ib_device *device);
62
63 static struct ib_client cm_client = {
64 .name = "cm",
65 .add = cm_add_one,
66 .remove = cm_remove_one
67 };
68
69 static struct ib_cm {
70 spinlock_t lock;
71 struct list_head device_list;
72 rwlock_t device_lock;
73 struct rb_root listen_service_table;
74 u64 listen_service_id;
75 /* struct rb_root peer_service_table; todo: fix peer to peer */
76 struct rb_root remote_qp_table;
77 struct rb_root remote_id_table;
78 struct rb_root remote_sidr_table;
79 struct idr local_id_table;
80 __be32 random_id_operand;
81 struct list_head timewait_list;
82 struct workqueue_struct *wq;
83 } cm;
84
85 /* Counter indexes ordered by attribute ID */
86 enum {
87 CM_REQ_COUNTER,
88 CM_MRA_COUNTER,
89 CM_REJ_COUNTER,
90 CM_REP_COUNTER,
91 CM_RTU_COUNTER,
92 CM_DREQ_COUNTER,
93 CM_DREP_COUNTER,
94 CM_SIDR_REQ_COUNTER,
95 CM_SIDR_REP_COUNTER,
96 CM_LAP_COUNTER,
97 CM_APR_COUNTER,
98 CM_ATTR_COUNT,
99 CM_ATTR_ID_OFFSET = 0x0010,
100 };
101
102 enum {
103 CM_XMIT,
104 CM_XMIT_RETRIES,
105 CM_RECV,
106 CM_RECV_DUPLICATES,
107 CM_COUNTER_GROUPS
108 };
109
110 static char const counter_group_names[CM_COUNTER_GROUPS]
111 [sizeof("cm_rx_duplicates")] = {
112 "cm_tx_msgs", "cm_tx_retries",
113 "cm_rx_msgs", "cm_rx_duplicates"
114 };
115
116 struct cm_counter_group {
117 struct kobject obj;
118 atomic_long_t counter[CM_ATTR_COUNT];
119 };
120
121 struct cm_counter_attribute {
122 struct attribute attr;
123 int index;
124 };
125
126 #define CM_COUNTER_ATTR(_name, _index) \
127 struct cm_counter_attribute cm_##_name##_counter_attr = { \
128 .attr = { .name = __stringify(_name), .mode = 0444 }, \
129 .index = _index \
130 }
131
132 static CM_COUNTER_ATTR(req, CM_REQ_COUNTER);
133 static CM_COUNTER_ATTR(mra, CM_MRA_COUNTER);
134 static CM_COUNTER_ATTR(rej, CM_REJ_COUNTER);
135 static CM_COUNTER_ATTR(rep, CM_REP_COUNTER);
136 static CM_COUNTER_ATTR(rtu, CM_RTU_COUNTER);
137 static CM_COUNTER_ATTR(dreq, CM_DREQ_COUNTER);
138 static CM_COUNTER_ATTR(drep, CM_DREP_COUNTER);
139 static CM_COUNTER_ATTR(sidr_req, CM_SIDR_REQ_COUNTER);
140 static CM_COUNTER_ATTR(sidr_rep, CM_SIDR_REP_COUNTER);
141 static CM_COUNTER_ATTR(lap, CM_LAP_COUNTER);
142 static CM_COUNTER_ATTR(apr, CM_APR_COUNTER);
143
144 static struct attribute *cm_counter_default_attrs[] = {
145 &cm_req_counter_attr.attr,
146 &cm_mra_counter_attr.attr,
147 &cm_rej_counter_attr.attr,
148 &cm_rep_counter_attr.attr,
149 &cm_rtu_counter_attr.attr,
150 &cm_dreq_counter_attr.attr,
151 &cm_drep_counter_attr.attr,
152 &cm_sidr_req_counter_attr.attr,
153 &cm_sidr_rep_counter_attr.attr,
154 &cm_lap_counter_attr.attr,
155 &cm_apr_counter_attr.attr,
156 NULL
157 };
158
159 struct cm_port {
160 struct cm_device *cm_dev;
161 struct ib_mad_agent *mad_agent;
162 struct kobject port_obj;
163 u8 port_num;
164 struct cm_counter_group counter_group[CM_COUNTER_GROUPS];
165 };
166
167 struct cm_device {
168 struct list_head list;
169 struct ib_device *ib_device;
170 struct device *device;
171 u8 ack_delay;
172 struct cm_port *port[0];
173 };
174
175 struct cm_av {
176 struct cm_port *port;
177 union ib_gid dgid;
178 struct ib_ah_attr ah_attr;
179 u16 pkey_index;
180 u8 timeout;
181 u8 valid;
182 u8 smac[ETH_ALEN];
183 };
184
185 struct cm_work {
186 struct delayed_work work;
187 struct list_head list;
188 struct cm_port *port;
189 struct ib_mad_recv_wc *mad_recv_wc; /* Received MADs */
190 __be32 local_id; /* Established / timewait */
191 __be32 remote_id;
192 struct ib_cm_event cm_event;
193 struct ib_sa_path_rec path[0];
194 };
195
196 struct cm_timewait_info {
197 struct cm_work work; /* Must be first. */
198 struct list_head list;
199 struct rb_node remote_qp_node;
200 struct rb_node remote_id_node;
201 __be64 remote_ca_guid;
202 __be32 remote_qpn;
203 u8 inserted_remote_qp;
204 u8 inserted_remote_id;
205 };
206
207 struct cm_id_private {
208 struct ib_cm_id id;
209
210 struct rb_node service_node;
211 struct rb_node sidr_id_node;
212 spinlock_t lock; /* Do not acquire inside cm.lock */
213 struct completion comp;
214 atomic_t refcount;
215
216 struct ib_mad_send_buf *msg;
217 struct cm_timewait_info *timewait_info;
218 /* todo: use alternate port on send failure */
219 struct cm_av av;
220 struct cm_av alt_av;
221 struct ib_cm_compare_data *compare_data;
222
223 void *private_data;
224 __be64 tid;
225 __be32 local_qpn;
226 __be32 remote_qpn;
227 enum ib_qp_type qp_type;
228 __be32 sq_psn;
229 __be32 rq_psn;
230 int timeout_ms;
231 enum ib_mtu path_mtu;
232 __be16 pkey;
233 u8 private_data_len;
234 u8 max_cm_retries;
235 u8 peer_to_peer;
236 u8 responder_resources;
237 u8 initiator_depth;
238 u8 retry_count;
239 u8 rnr_retry_count;
240 u8 service_timeout;
241 u8 target_ack_delay;
242
243 struct list_head work_list;
244 atomic_t work_count;
245 };
246
247 static void cm_work_handler(struct work_struct *work);
248
cm_deref_id(struct cm_id_private * cm_id_priv)249 static inline void cm_deref_id(struct cm_id_private *cm_id_priv)
250 {
251 if (atomic_dec_and_test(&cm_id_priv->refcount))
252 complete(&cm_id_priv->comp);
253 }
254
cm_alloc_msg(struct cm_id_private * cm_id_priv,struct ib_mad_send_buf ** msg)255 static int cm_alloc_msg(struct cm_id_private *cm_id_priv,
256 struct ib_mad_send_buf **msg)
257 {
258 struct ib_mad_agent *mad_agent;
259 struct ib_mad_send_buf *m;
260 struct ib_ah *ah;
261
262 mad_agent = cm_id_priv->av.port->mad_agent;
263 ah = ib_create_ah(mad_agent->qp->pd, &cm_id_priv->av.ah_attr);
264 if (IS_ERR(ah))
265 return PTR_ERR(ah);
266
267 m = ib_create_send_mad(mad_agent, cm_id_priv->id.remote_cm_qpn,
268 cm_id_priv->av.pkey_index,
269 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
270 GFP_ATOMIC);
271 if (IS_ERR(m)) {
272 ib_destroy_ah(ah);
273 return PTR_ERR(m);
274 }
275
276 /* Timeout set by caller if response is expected. */
277 m->ah = ah;
278 m->retries = cm_id_priv->max_cm_retries;
279
280 atomic_inc(&cm_id_priv->refcount);
281 m->context[0] = cm_id_priv;
282 *msg = m;
283 return 0;
284 }
285
cm_alloc_response_msg(struct cm_port * port,struct ib_mad_recv_wc * mad_recv_wc,struct ib_mad_send_buf ** msg)286 static int cm_alloc_response_msg(struct cm_port *port,
287 struct ib_mad_recv_wc *mad_recv_wc,
288 struct ib_mad_send_buf **msg)
289 {
290 struct ib_mad_send_buf *m;
291 struct ib_ah *ah;
292
293 ah = ib_create_ah_from_wc(port->mad_agent->qp->pd, mad_recv_wc->wc,
294 mad_recv_wc->recv_buf.grh, port->port_num);
295 if (IS_ERR(ah))
296 return PTR_ERR(ah);
297
298 m = ib_create_send_mad(port->mad_agent, 1, mad_recv_wc->wc->pkey_index,
299 0, IB_MGMT_MAD_HDR, IB_MGMT_MAD_DATA,
300 GFP_ATOMIC);
301 if (IS_ERR(m)) {
302 ib_destroy_ah(ah);
303 return PTR_ERR(m);
304 }
305 m->ah = ah;
306 *msg = m;
307 return 0;
308 }
309
cm_free_msg(struct ib_mad_send_buf * msg)310 static void cm_free_msg(struct ib_mad_send_buf *msg)
311 {
312 ib_destroy_ah(msg->ah);
313 if (msg->context[0])
314 cm_deref_id(msg->context[0]);
315 ib_free_send_mad(msg);
316 }
317
cm_copy_private_data(const void * private_data,u8 private_data_len)318 static void * cm_copy_private_data(const void *private_data,
319 u8 private_data_len)
320 {
321 void *data;
322
323 if (!private_data || !private_data_len)
324 return NULL;
325
326 data = kmemdup(private_data, private_data_len, GFP_KERNEL);
327 if (!data)
328 return ERR_PTR(-ENOMEM);
329
330 return data;
331 }
332
cm_set_private_data(struct cm_id_private * cm_id_priv,void * private_data,u8 private_data_len)333 static void cm_set_private_data(struct cm_id_private *cm_id_priv,
334 void *private_data, u8 private_data_len)
335 {
336 if (cm_id_priv->private_data && cm_id_priv->private_data_len)
337 kfree(cm_id_priv->private_data);
338
339 cm_id_priv->private_data = private_data;
340 cm_id_priv->private_data_len = private_data_len;
341 }
342
cm_init_av_for_response(struct cm_port * port,struct ib_wc * wc,struct ib_grh * grh,struct cm_av * av)343 static void cm_init_av_for_response(struct cm_port *port, struct ib_wc *wc,
344 struct ib_grh *grh, struct cm_av *av)
345 {
346 av->port = port;
347 av->pkey_index = wc->pkey_index;
348 ib_init_ah_from_wc(port->cm_dev->ib_device, port->port_num, wc,
349 grh, &av->ah_attr);
350 }
351
cm_init_av_by_path(struct ib_sa_path_rec * path,struct cm_av * av)352 static int cm_init_av_by_path(struct ib_sa_path_rec *path, struct cm_av *av)
353 {
354 struct cm_device *cm_dev;
355 struct cm_port *port = NULL;
356 unsigned long flags;
357 int ret;
358 u8 p;
359
360 read_lock_irqsave(&cm.device_lock, flags);
361 list_for_each_entry(cm_dev, &cm.device_list, list) {
362 if (!ib_find_cached_gid(cm_dev->ib_device, &path->sgid,
363 &p, NULL)) {
364 port = cm_dev->port[p-1];
365 break;
366 }
367 }
368 read_unlock_irqrestore(&cm.device_lock, flags);
369
370 if (!port)
371 return -EINVAL;
372
373 ret = ib_find_cached_pkey(cm_dev->ib_device, port->port_num,
374 be16_to_cpu(path->pkey), &av->pkey_index);
375 if (ret)
376 return ret;
377
378 av->port = port;
379 ib_init_ah_from_path(cm_dev->ib_device, port->port_num, path,
380 &av->ah_attr);
381 av->timeout = path->packet_life_time + 1;
382 memcpy(av->smac, path->smac, sizeof(av->smac));
383
384 av->valid = 1;
385 return 0;
386 }
387
cm_alloc_id(struct cm_id_private * cm_id_priv)388 static int cm_alloc_id(struct cm_id_private *cm_id_priv)
389 {
390 unsigned long flags;
391 int id;
392
393 idr_preload(GFP_KERNEL);
394 spin_lock_irqsave(&cm.lock, flags);
395
396 id = idr_alloc_cyclic(&cm.local_id_table, cm_id_priv, 0, 0, GFP_NOWAIT);
397
398 spin_unlock_irqrestore(&cm.lock, flags);
399 idr_preload_end();
400
401 cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;
402 return id < 0 ? id : 0;
403 }
404
cm_free_id(__be32 local_id)405 static void cm_free_id(__be32 local_id)
406 {
407 spin_lock_irq(&cm.lock);
408 idr_remove(&cm.local_id_table,
409 (__force int) (local_id ^ cm.random_id_operand));
410 spin_unlock_irq(&cm.lock);
411 }
412
cm_get_id(__be32 local_id,__be32 remote_id)413 static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)
414 {
415 struct cm_id_private *cm_id_priv;
416
417 cm_id_priv = idr_find(&cm.local_id_table,
418 (__force int) (local_id ^ cm.random_id_operand));
419 if (cm_id_priv) {
420 if (cm_id_priv->id.remote_id == remote_id)
421 atomic_inc(&cm_id_priv->refcount);
422 else
423 cm_id_priv = NULL;
424 }
425
426 return cm_id_priv;
427 }
428
cm_acquire_id(__be32 local_id,__be32 remote_id)429 static struct cm_id_private * cm_acquire_id(__be32 local_id, __be32 remote_id)
430 {
431 struct cm_id_private *cm_id_priv;
432
433 spin_lock_irq(&cm.lock);
434 cm_id_priv = cm_get_id(local_id, remote_id);
435 spin_unlock_irq(&cm.lock);
436
437 return cm_id_priv;
438 }
439
cm_mask_copy(u32 * dst,const u32 * src,const u32 * mask)440 static void cm_mask_copy(u32 *dst, const u32 *src, const u32 *mask)
441 {
442 int i;
443
444 for (i = 0; i < IB_CM_COMPARE_SIZE; i++)
445 dst[i] = src[i] & mask[i];
446 }
447
cm_compare_data(struct ib_cm_compare_data * src_data,struct ib_cm_compare_data * dst_data)448 static int cm_compare_data(struct ib_cm_compare_data *src_data,
449 struct ib_cm_compare_data *dst_data)
450 {
451 u32 src[IB_CM_COMPARE_SIZE];
452 u32 dst[IB_CM_COMPARE_SIZE];
453
454 if (!src_data || !dst_data)
455 return 0;
456
457 cm_mask_copy(src, src_data->data, dst_data->mask);
458 cm_mask_copy(dst, dst_data->data, src_data->mask);
459 return memcmp(src, dst, sizeof(src));
460 }
461
cm_compare_private_data(u32 * private_data,struct ib_cm_compare_data * dst_data)462 static int cm_compare_private_data(u32 *private_data,
463 struct ib_cm_compare_data *dst_data)
464 {
465 u32 src[IB_CM_COMPARE_SIZE];
466
467 if (!dst_data)
468 return 0;
469
470 cm_mask_copy(src, private_data, dst_data->mask);
471 return memcmp(src, dst_data->data, sizeof(src));
472 }
473
474 /*
475 * Trivial helpers to strip endian annotation and compare; the
476 * endianness doesn't actually matter since we just need a stable
477 * order for the RB tree.
478 */
be32_lt(__be32 a,__be32 b)479 static int be32_lt(__be32 a, __be32 b)
480 {
481 return (__force u32) a < (__force u32) b;
482 }
483
be32_gt(__be32 a,__be32 b)484 static int be32_gt(__be32 a, __be32 b)
485 {
486 return (__force u32) a > (__force u32) b;
487 }
488
be64_lt(__be64 a,__be64 b)489 static int be64_lt(__be64 a, __be64 b)
490 {
491 return (__force u64) a < (__force u64) b;
492 }
493
be64_gt(__be64 a,__be64 b)494 static int be64_gt(__be64 a, __be64 b)
495 {
496 return (__force u64) a > (__force u64) b;
497 }
498
cm_insert_listen(struct cm_id_private * cm_id_priv)499 static struct cm_id_private * cm_insert_listen(struct cm_id_private *cm_id_priv)
500 {
501 struct rb_node **link = &cm.listen_service_table.rb_node;
502 struct rb_node *parent = NULL;
503 struct cm_id_private *cur_cm_id_priv;
504 __be64 service_id = cm_id_priv->id.service_id;
505 __be64 service_mask = cm_id_priv->id.service_mask;
506 int data_cmp;
507
508 while (*link) {
509 parent = *link;
510 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
511 service_node);
512 data_cmp = cm_compare_data(cm_id_priv->compare_data,
513 cur_cm_id_priv->compare_data);
514 if ((cur_cm_id_priv->id.service_mask & service_id) ==
515 (service_mask & cur_cm_id_priv->id.service_id) &&
516 (cm_id_priv->id.device == cur_cm_id_priv->id.device) &&
517 !data_cmp)
518 return cur_cm_id_priv;
519
520 if (cm_id_priv->id.device < cur_cm_id_priv->id.device)
521 link = &(*link)->rb_left;
522 else if (cm_id_priv->id.device > cur_cm_id_priv->id.device)
523 link = &(*link)->rb_right;
524 else if (be64_lt(service_id, cur_cm_id_priv->id.service_id))
525 link = &(*link)->rb_left;
526 else if (be64_gt(service_id, cur_cm_id_priv->id.service_id))
527 link = &(*link)->rb_right;
528 else if (data_cmp < 0)
529 link = &(*link)->rb_left;
530 else
531 link = &(*link)->rb_right;
532 }
533 rb_link_node(&cm_id_priv->service_node, parent, link);
534 rb_insert_color(&cm_id_priv->service_node, &cm.listen_service_table);
535 return NULL;
536 }
537
cm_find_listen(struct ib_device * device,__be64 service_id,u32 * private_data)538 static struct cm_id_private * cm_find_listen(struct ib_device *device,
539 __be64 service_id,
540 u32 *private_data)
541 {
542 struct rb_node *node = cm.listen_service_table.rb_node;
543 struct cm_id_private *cm_id_priv;
544 int data_cmp;
545
546 while (node) {
547 cm_id_priv = rb_entry(node, struct cm_id_private, service_node);
548 data_cmp = cm_compare_private_data(private_data,
549 cm_id_priv->compare_data);
550 if ((cm_id_priv->id.service_mask & service_id) ==
551 cm_id_priv->id.service_id &&
552 (cm_id_priv->id.device == device) && !data_cmp)
553 return cm_id_priv;
554
555 if (device < cm_id_priv->id.device)
556 node = node->rb_left;
557 else if (device > cm_id_priv->id.device)
558 node = node->rb_right;
559 else if (be64_lt(service_id, cm_id_priv->id.service_id))
560 node = node->rb_left;
561 else if (be64_gt(service_id, cm_id_priv->id.service_id))
562 node = node->rb_right;
563 else if (data_cmp < 0)
564 node = node->rb_left;
565 else
566 node = node->rb_right;
567 }
568 return NULL;
569 }
570
cm_insert_remote_id(struct cm_timewait_info * timewait_info)571 static struct cm_timewait_info * cm_insert_remote_id(struct cm_timewait_info
572 *timewait_info)
573 {
574 struct rb_node **link = &cm.remote_id_table.rb_node;
575 struct rb_node *parent = NULL;
576 struct cm_timewait_info *cur_timewait_info;
577 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
578 __be32 remote_id = timewait_info->work.remote_id;
579
580 while (*link) {
581 parent = *link;
582 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
583 remote_id_node);
584 if (be32_lt(remote_id, cur_timewait_info->work.remote_id))
585 link = &(*link)->rb_left;
586 else if (be32_gt(remote_id, cur_timewait_info->work.remote_id))
587 link = &(*link)->rb_right;
588 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
589 link = &(*link)->rb_left;
590 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
591 link = &(*link)->rb_right;
592 else
593 return cur_timewait_info;
594 }
595 timewait_info->inserted_remote_id = 1;
596 rb_link_node(&timewait_info->remote_id_node, parent, link);
597 rb_insert_color(&timewait_info->remote_id_node, &cm.remote_id_table);
598 return NULL;
599 }
600
cm_find_remote_id(__be64 remote_ca_guid,__be32 remote_id)601 static struct cm_timewait_info * cm_find_remote_id(__be64 remote_ca_guid,
602 __be32 remote_id)
603 {
604 struct rb_node *node = cm.remote_id_table.rb_node;
605 struct cm_timewait_info *timewait_info;
606
607 while (node) {
608 timewait_info = rb_entry(node, struct cm_timewait_info,
609 remote_id_node);
610 if (be32_lt(remote_id, timewait_info->work.remote_id))
611 node = node->rb_left;
612 else if (be32_gt(remote_id, timewait_info->work.remote_id))
613 node = node->rb_right;
614 else if (be64_lt(remote_ca_guid, timewait_info->remote_ca_guid))
615 node = node->rb_left;
616 else if (be64_gt(remote_ca_guid, timewait_info->remote_ca_guid))
617 node = node->rb_right;
618 else
619 return timewait_info;
620 }
621 return NULL;
622 }
623
cm_insert_remote_qpn(struct cm_timewait_info * timewait_info)624 static struct cm_timewait_info * cm_insert_remote_qpn(struct cm_timewait_info
625 *timewait_info)
626 {
627 struct rb_node **link = &cm.remote_qp_table.rb_node;
628 struct rb_node *parent = NULL;
629 struct cm_timewait_info *cur_timewait_info;
630 __be64 remote_ca_guid = timewait_info->remote_ca_guid;
631 __be32 remote_qpn = timewait_info->remote_qpn;
632
633 while (*link) {
634 parent = *link;
635 cur_timewait_info = rb_entry(parent, struct cm_timewait_info,
636 remote_qp_node);
637 if (be32_lt(remote_qpn, cur_timewait_info->remote_qpn))
638 link = &(*link)->rb_left;
639 else if (be32_gt(remote_qpn, cur_timewait_info->remote_qpn))
640 link = &(*link)->rb_right;
641 else if (be64_lt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
642 link = &(*link)->rb_left;
643 else if (be64_gt(remote_ca_guid, cur_timewait_info->remote_ca_guid))
644 link = &(*link)->rb_right;
645 else
646 return cur_timewait_info;
647 }
648 timewait_info->inserted_remote_qp = 1;
649 rb_link_node(&timewait_info->remote_qp_node, parent, link);
650 rb_insert_color(&timewait_info->remote_qp_node, &cm.remote_qp_table);
651 return NULL;
652 }
653
cm_insert_remote_sidr(struct cm_id_private * cm_id_priv)654 static struct cm_id_private * cm_insert_remote_sidr(struct cm_id_private
655 *cm_id_priv)
656 {
657 struct rb_node **link = &cm.remote_sidr_table.rb_node;
658 struct rb_node *parent = NULL;
659 struct cm_id_private *cur_cm_id_priv;
660 union ib_gid *port_gid = &cm_id_priv->av.dgid;
661 __be32 remote_id = cm_id_priv->id.remote_id;
662
663 while (*link) {
664 parent = *link;
665 cur_cm_id_priv = rb_entry(parent, struct cm_id_private,
666 sidr_id_node);
667 if (be32_lt(remote_id, cur_cm_id_priv->id.remote_id))
668 link = &(*link)->rb_left;
669 else if (be32_gt(remote_id, cur_cm_id_priv->id.remote_id))
670 link = &(*link)->rb_right;
671 else {
672 int cmp;
673 cmp = memcmp(port_gid, &cur_cm_id_priv->av.dgid,
674 sizeof *port_gid);
675 if (cmp < 0)
676 link = &(*link)->rb_left;
677 else if (cmp > 0)
678 link = &(*link)->rb_right;
679 else
680 return cur_cm_id_priv;
681 }
682 }
683 rb_link_node(&cm_id_priv->sidr_id_node, parent, link);
684 rb_insert_color(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
685 return NULL;
686 }
687
cm_reject_sidr_req(struct cm_id_private * cm_id_priv,enum ib_cm_sidr_status status)688 static void cm_reject_sidr_req(struct cm_id_private *cm_id_priv,
689 enum ib_cm_sidr_status status)
690 {
691 struct ib_cm_sidr_rep_param param;
692
693 memset(¶m, 0, sizeof param);
694 param.status = status;
695 ib_send_cm_sidr_rep(&cm_id_priv->id, ¶m);
696 }
697
ib_create_cm_id(struct ib_device * device,ib_cm_handler cm_handler,void * context)698 struct ib_cm_id *ib_create_cm_id(struct ib_device *device,
699 ib_cm_handler cm_handler,
700 void *context)
701 {
702 struct cm_id_private *cm_id_priv;
703 int ret;
704
705 cm_id_priv = kzalloc(sizeof *cm_id_priv, GFP_KERNEL);
706 if (!cm_id_priv)
707 return ERR_PTR(-ENOMEM);
708
709 cm_id_priv->id.state = IB_CM_IDLE;
710 cm_id_priv->id.device = device;
711 cm_id_priv->id.cm_handler = cm_handler;
712 cm_id_priv->id.context = context;
713 cm_id_priv->id.remote_cm_qpn = 1;
714 ret = cm_alloc_id(cm_id_priv);
715 if (ret)
716 goto error;
717
718 spin_lock_init(&cm_id_priv->lock);
719 init_completion(&cm_id_priv->comp);
720 INIT_LIST_HEAD(&cm_id_priv->work_list);
721 atomic_set(&cm_id_priv->work_count, -1);
722 atomic_set(&cm_id_priv->refcount, 1);
723 return &cm_id_priv->id;
724
725 error:
726 kfree(cm_id_priv);
727 return ERR_PTR(-ENOMEM);
728 }
729 EXPORT_SYMBOL(ib_create_cm_id);
730
cm_dequeue_work(struct cm_id_private * cm_id_priv)731 static struct cm_work * cm_dequeue_work(struct cm_id_private *cm_id_priv)
732 {
733 struct cm_work *work;
734
735 if (list_empty(&cm_id_priv->work_list))
736 return NULL;
737
738 work = list_entry(cm_id_priv->work_list.next, struct cm_work, list);
739 list_del(&work->list);
740 return work;
741 }
742
cm_free_work(struct cm_work * work)743 static void cm_free_work(struct cm_work *work)
744 {
745 if (work->mad_recv_wc)
746 ib_free_recv_mad(work->mad_recv_wc);
747 kfree(work);
748 }
749
cm_convert_to_ms(int iba_time)750 static inline int cm_convert_to_ms(int iba_time)
751 {
752 /* approximate conversion to ms from 4.096us x 2^iba_time */
753 return 1 << max(iba_time - 8, 0);
754 }
755
756 /*
757 * calculate: 4.096x2^ack_timeout = 4.096x2^ack_delay + 2x4.096x2^life_time
758 * Because of how ack_timeout is stored, adding one doubles the timeout.
759 * To avoid large timeouts, select the max(ack_delay, life_time + 1), and
760 * increment it (round up) only if the other is within 50%.
761 */
cm_ack_timeout(u8 ca_ack_delay,u8 packet_life_time)762 static u8 cm_ack_timeout(u8 ca_ack_delay, u8 packet_life_time)
763 {
764 int ack_timeout = packet_life_time + 1;
765
766 if (ack_timeout >= ca_ack_delay)
767 ack_timeout += (ca_ack_delay >= (ack_timeout - 1));
768 else
769 ack_timeout = ca_ack_delay +
770 (ack_timeout >= (ca_ack_delay - 1));
771
772 return min(31, ack_timeout);
773 }
774
cm_cleanup_timewait(struct cm_timewait_info * timewait_info)775 static void cm_cleanup_timewait(struct cm_timewait_info *timewait_info)
776 {
777 if (timewait_info->inserted_remote_id) {
778 rb_erase(&timewait_info->remote_id_node, &cm.remote_id_table);
779 timewait_info->inserted_remote_id = 0;
780 }
781
782 if (timewait_info->inserted_remote_qp) {
783 rb_erase(&timewait_info->remote_qp_node, &cm.remote_qp_table);
784 timewait_info->inserted_remote_qp = 0;
785 }
786 }
787
cm_create_timewait_info(__be32 local_id)788 static struct cm_timewait_info * cm_create_timewait_info(__be32 local_id)
789 {
790 struct cm_timewait_info *timewait_info;
791
792 timewait_info = kzalloc(sizeof *timewait_info, GFP_KERNEL);
793 if (!timewait_info)
794 return ERR_PTR(-ENOMEM);
795
796 timewait_info->work.local_id = local_id;
797 INIT_DELAYED_WORK(&timewait_info->work.work, cm_work_handler);
798 timewait_info->work.cm_event.event = IB_CM_TIMEWAIT_EXIT;
799 return timewait_info;
800 }
801
cm_enter_timewait(struct cm_id_private * cm_id_priv)802 static void cm_enter_timewait(struct cm_id_private *cm_id_priv)
803 {
804 int wait_time;
805 unsigned long flags;
806
807 spin_lock_irqsave(&cm.lock, flags);
808 cm_cleanup_timewait(cm_id_priv->timewait_info);
809 list_add_tail(&cm_id_priv->timewait_info->list, &cm.timewait_list);
810 spin_unlock_irqrestore(&cm.lock, flags);
811
812 /*
813 * The cm_id could be destroyed by the user before we exit timewait.
814 * To protect against this, we search for the cm_id after exiting
815 * timewait before notifying the user that we've exited timewait.
816 */
817 cm_id_priv->id.state = IB_CM_TIMEWAIT;
818 wait_time = cm_convert_to_ms(cm_id_priv->av.timeout);
819 queue_delayed_work(cm.wq, &cm_id_priv->timewait_info->work.work,
820 msecs_to_jiffies(wait_time));
821 cm_id_priv->timewait_info = NULL;
822 }
823
cm_reset_to_idle(struct cm_id_private * cm_id_priv)824 static void cm_reset_to_idle(struct cm_id_private *cm_id_priv)
825 {
826 unsigned long flags;
827
828 cm_id_priv->id.state = IB_CM_IDLE;
829 if (cm_id_priv->timewait_info) {
830 spin_lock_irqsave(&cm.lock, flags);
831 cm_cleanup_timewait(cm_id_priv->timewait_info);
832 spin_unlock_irqrestore(&cm.lock, flags);
833 kfree(cm_id_priv->timewait_info);
834 cm_id_priv->timewait_info = NULL;
835 }
836 }
837
cm_destroy_id(struct ib_cm_id * cm_id,int err)838 static void cm_destroy_id(struct ib_cm_id *cm_id, int err)
839 {
840 struct cm_id_private *cm_id_priv;
841 struct cm_work *work;
842
843 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
844 retest:
845 spin_lock_irq(&cm_id_priv->lock);
846 switch (cm_id->state) {
847 case IB_CM_LISTEN:
848 cm_id->state = IB_CM_IDLE;
849 spin_unlock_irq(&cm_id_priv->lock);
850 spin_lock_irq(&cm.lock);
851 rb_erase(&cm_id_priv->service_node, &cm.listen_service_table);
852 spin_unlock_irq(&cm.lock);
853 break;
854 case IB_CM_SIDR_REQ_SENT:
855 cm_id->state = IB_CM_IDLE;
856 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
857 spin_unlock_irq(&cm_id_priv->lock);
858 break;
859 case IB_CM_SIDR_REQ_RCVD:
860 spin_unlock_irq(&cm_id_priv->lock);
861 cm_reject_sidr_req(cm_id_priv, IB_SIDR_REJECT);
862 spin_lock_irq(&cm.lock);
863 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node))
864 rb_erase(&cm_id_priv->sidr_id_node,
865 &cm.remote_sidr_table);
866 spin_unlock_irq(&cm.lock);
867 break;
868 case IB_CM_REQ_SENT:
869 case IB_CM_MRA_REQ_RCVD:
870 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
871 spin_unlock_irq(&cm_id_priv->lock);
872 ib_send_cm_rej(cm_id, IB_CM_REJ_TIMEOUT,
873 &cm_id_priv->id.device->node_guid,
874 sizeof cm_id_priv->id.device->node_guid,
875 NULL, 0);
876 break;
877 case IB_CM_REQ_RCVD:
878 if (err == -ENOMEM) {
879 /* Do not reject to allow future retries. */
880 cm_reset_to_idle(cm_id_priv);
881 spin_unlock_irq(&cm_id_priv->lock);
882 } else {
883 spin_unlock_irq(&cm_id_priv->lock);
884 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
885 NULL, 0, NULL, 0);
886 }
887 break;
888 case IB_CM_REP_SENT:
889 case IB_CM_MRA_REP_RCVD:
890 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
891 /* Fall through */
892 case IB_CM_MRA_REQ_SENT:
893 case IB_CM_REP_RCVD:
894 case IB_CM_MRA_REP_SENT:
895 spin_unlock_irq(&cm_id_priv->lock);
896 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
897 NULL, 0, NULL, 0);
898 break;
899 case IB_CM_ESTABLISHED:
900 spin_unlock_irq(&cm_id_priv->lock);
901 if (cm_id_priv->qp_type == IB_QPT_XRC_TGT)
902 break;
903 ib_send_cm_dreq(cm_id, NULL, 0);
904 goto retest;
905 case IB_CM_DREQ_SENT:
906 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
907 cm_enter_timewait(cm_id_priv);
908 spin_unlock_irq(&cm_id_priv->lock);
909 break;
910 case IB_CM_DREQ_RCVD:
911 spin_unlock_irq(&cm_id_priv->lock);
912 ib_send_cm_drep(cm_id, NULL, 0);
913 break;
914 default:
915 spin_unlock_irq(&cm_id_priv->lock);
916 break;
917 }
918
919 cm_free_id(cm_id->local_id);
920 cm_deref_id(cm_id_priv);
921 wait_for_completion(&cm_id_priv->comp);
922 while ((work = cm_dequeue_work(cm_id_priv)) != NULL)
923 cm_free_work(work);
924 kfree(cm_id_priv->compare_data);
925 kfree(cm_id_priv->private_data);
926 kfree(cm_id_priv);
927 }
928
ib_destroy_cm_id(struct ib_cm_id * cm_id)929 void ib_destroy_cm_id(struct ib_cm_id *cm_id)
930 {
931 cm_destroy_id(cm_id, 0);
932 }
933 EXPORT_SYMBOL(ib_destroy_cm_id);
934
ib_cm_listen(struct ib_cm_id * cm_id,__be64 service_id,__be64 service_mask,struct ib_cm_compare_data * compare_data)935 int ib_cm_listen(struct ib_cm_id *cm_id, __be64 service_id, __be64 service_mask,
936 struct ib_cm_compare_data *compare_data)
937 {
938 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
939 unsigned long flags;
940 int ret = 0;
941
942 service_mask = service_mask ? service_mask : ~cpu_to_be64(0);
943 service_id &= service_mask;
944 if ((service_id & IB_SERVICE_ID_AGN_MASK) == IB_CM_ASSIGN_SERVICE_ID &&
945 (service_id != IB_CM_ASSIGN_SERVICE_ID))
946 return -EINVAL;
947
948 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
949 if (cm_id->state != IB_CM_IDLE)
950 return -EINVAL;
951
952 if (compare_data) {
953 cm_id_priv->compare_data = kzalloc(sizeof *compare_data,
954 GFP_KERNEL);
955 if (!cm_id_priv->compare_data)
956 return -ENOMEM;
957 cm_mask_copy(cm_id_priv->compare_data->data,
958 compare_data->data, compare_data->mask);
959 memcpy(cm_id_priv->compare_data->mask, compare_data->mask,
960 sizeof(compare_data->mask));
961 }
962
963 cm_id->state = IB_CM_LISTEN;
964
965 spin_lock_irqsave(&cm.lock, flags);
966 if (service_id == IB_CM_ASSIGN_SERVICE_ID) {
967 cm_id->service_id = cpu_to_be64(cm.listen_service_id++);
968 cm_id->service_mask = ~cpu_to_be64(0);
969 } else {
970 cm_id->service_id = service_id;
971 cm_id->service_mask = service_mask;
972 }
973 cur_cm_id_priv = cm_insert_listen(cm_id_priv);
974 spin_unlock_irqrestore(&cm.lock, flags);
975
976 if (cur_cm_id_priv) {
977 cm_id->state = IB_CM_IDLE;
978 kfree(cm_id_priv->compare_data);
979 cm_id_priv->compare_data = NULL;
980 ret = -EBUSY;
981 }
982 return ret;
983 }
984 EXPORT_SYMBOL(ib_cm_listen);
985
cm_form_tid(struct cm_id_private * cm_id_priv,enum cm_msg_sequence msg_seq)986 static __be64 cm_form_tid(struct cm_id_private *cm_id_priv,
987 enum cm_msg_sequence msg_seq)
988 {
989 u64 hi_tid, low_tid;
990
991 hi_tid = ((u64) cm_id_priv->av.port->mad_agent->hi_tid) << 32;
992 low_tid = (u64) ((__force u32)cm_id_priv->id.local_id |
993 (msg_seq << 30));
994 return cpu_to_be64(hi_tid | low_tid);
995 }
996
cm_format_mad_hdr(struct ib_mad_hdr * hdr,__be16 attr_id,__be64 tid)997 static void cm_format_mad_hdr(struct ib_mad_hdr *hdr,
998 __be16 attr_id, __be64 tid)
999 {
1000 hdr->base_version = IB_MGMT_BASE_VERSION;
1001 hdr->mgmt_class = IB_MGMT_CLASS_CM;
1002 hdr->class_version = IB_CM_CLASS_VERSION;
1003 hdr->method = IB_MGMT_METHOD_SEND;
1004 hdr->attr_id = attr_id;
1005 hdr->tid = tid;
1006 }
1007
cm_format_req(struct cm_req_msg * req_msg,struct cm_id_private * cm_id_priv,struct ib_cm_req_param * param)1008 static void cm_format_req(struct cm_req_msg *req_msg,
1009 struct cm_id_private *cm_id_priv,
1010 struct ib_cm_req_param *param)
1011 {
1012 struct ib_sa_path_rec *pri_path = param->primary_path;
1013 struct ib_sa_path_rec *alt_path = param->alternate_path;
1014
1015 cm_format_mad_hdr(&req_msg->hdr, CM_REQ_ATTR_ID,
1016 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_REQ));
1017
1018 req_msg->local_comm_id = cm_id_priv->id.local_id;
1019 req_msg->service_id = param->service_id;
1020 req_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1021 cm_req_set_local_qpn(req_msg, cpu_to_be32(param->qp_num));
1022 cm_req_set_init_depth(req_msg, param->initiator_depth);
1023 cm_req_set_remote_resp_timeout(req_msg,
1024 param->remote_cm_response_timeout);
1025 cm_req_set_qp_type(req_msg, param->qp_type);
1026 cm_req_set_flow_ctrl(req_msg, param->flow_control);
1027 cm_req_set_starting_psn(req_msg, cpu_to_be32(param->starting_psn));
1028 cm_req_set_local_resp_timeout(req_msg,
1029 param->local_cm_response_timeout);
1030 req_msg->pkey = param->primary_path->pkey;
1031 cm_req_set_path_mtu(req_msg, param->primary_path->mtu);
1032 cm_req_set_max_cm_retries(req_msg, param->max_cm_retries);
1033
1034 if (param->qp_type != IB_QPT_XRC_INI) {
1035 cm_req_set_resp_res(req_msg, param->responder_resources);
1036 cm_req_set_retry_count(req_msg, param->retry_count);
1037 cm_req_set_rnr_retry_count(req_msg, param->rnr_retry_count);
1038 cm_req_set_srq(req_msg, param->srq);
1039 }
1040
1041 if (pri_path->hop_limit <= 1) {
1042 req_msg->primary_local_lid = pri_path->slid;
1043 req_msg->primary_remote_lid = pri_path->dlid;
1044 } else {
1045 /* Work-around until there's a way to obtain remote LID info */
1046 req_msg->primary_local_lid = IB_LID_PERMISSIVE;
1047 req_msg->primary_remote_lid = IB_LID_PERMISSIVE;
1048 }
1049 req_msg->primary_local_gid = pri_path->sgid;
1050 req_msg->primary_remote_gid = pri_path->dgid;
1051 cm_req_set_primary_flow_label(req_msg, pri_path->flow_label);
1052 cm_req_set_primary_packet_rate(req_msg, pri_path->rate);
1053 req_msg->primary_traffic_class = pri_path->traffic_class;
1054 req_msg->primary_hop_limit = pri_path->hop_limit;
1055 cm_req_set_primary_sl(req_msg, pri_path->sl);
1056 cm_req_set_primary_subnet_local(req_msg, (pri_path->hop_limit <= 1));
1057 cm_req_set_primary_local_ack_timeout(req_msg,
1058 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1059 pri_path->packet_life_time));
1060
1061 if (alt_path) {
1062 if (alt_path->hop_limit <= 1) {
1063 req_msg->alt_local_lid = alt_path->slid;
1064 req_msg->alt_remote_lid = alt_path->dlid;
1065 } else {
1066 req_msg->alt_local_lid = IB_LID_PERMISSIVE;
1067 req_msg->alt_remote_lid = IB_LID_PERMISSIVE;
1068 }
1069 req_msg->alt_local_gid = alt_path->sgid;
1070 req_msg->alt_remote_gid = alt_path->dgid;
1071 cm_req_set_alt_flow_label(req_msg,
1072 alt_path->flow_label);
1073 cm_req_set_alt_packet_rate(req_msg, alt_path->rate);
1074 req_msg->alt_traffic_class = alt_path->traffic_class;
1075 req_msg->alt_hop_limit = alt_path->hop_limit;
1076 cm_req_set_alt_sl(req_msg, alt_path->sl);
1077 cm_req_set_alt_subnet_local(req_msg, (alt_path->hop_limit <= 1));
1078 cm_req_set_alt_local_ack_timeout(req_msg,
1079 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
1080 alt_path->packet_life_time));
1081 }
1082
1083 if (param->private_data && param->private_data_len)
1084 memcpy(req_msg->private_data, param->private_data,
1085 param->private_data_len);
1086 }
1087
cm_validate_req_param(struct ib_cm_req_param * param)1088 static int cm_validate_req_param(struct ib_cm_req_param *param)
1089 {
1090 /* peer-to-peer not supported */
1091 if (param->peer_to_peer)
1092 return -EINVAL;
1093
1094 if (!param->primary_path)
1095 return -EINVAL;
1096
1097 if (param->qp_type != IB_QPT_RC && param->qp_type != IB_QPT_UC &&
1098 param->qp_type != IB_QPT_XRC_INI)
1099 return -EINVAL;
1100
1101 if (param->private_data &&
1102 param->private_data_len > IB_CM_REQ_PRIVATE_DATA_SIZE)
1103 return -EINVAL;
1104
1105 if (param->alternate_path &&
1106 (param->alternate_path->pkey != param->primary_path->pkey ||
1107 param->alternate_path->mtu != param->primary_path->mtu))
1108 return -EINVAL;
1109
1110 return 0;
1111 }
1112
ib_send_cm_req(struct ib_cm_id * cm_id,struct ib_cm_req_param * param)1113 int ib_send_cm_req(struct ib_cm_id *cm_id,
1114 struct ib_cm_req_param *param)
1115 {
1116 struct cm_id_private *cm_id_priv;
1117 struct cm_req_msg *req_msg;
1118 unsigned long flags;
1119 int ret;
1120
1121 ret = cm_validate_req_param(param);
1122 if (ret)
1123 return ret;
1124
1125 /* Verify that we're not in timewait. */
1126 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1127 spin_lock_irqsave(&cm_id_priv->lock, flags);
1128 if (cm_id->state != IB_CM_IDLE) {
1129 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1130 ret = -EINVAL;
1131 goto out;
1132 }
1133 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1134
1135 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1136 id.local_id);
1137 if (IS_ERR(cm_id_priv->timewait_info)) {
1138 ret = PTR_ERR(cm_id_priv->timewait_info);
1139 goto out;
1140 }
1141
1142 ret = cm_init_av_by_path(param->primary_path, &cm_id_priv->av);
1143 if (ret)
1144 goto error1;
1145 if (param->alternate_path) {
1146 ret = cm_init_av_by_path(param->alternate_path,
1147 &cm_id_priv->alt_av);
1148 if (ret)
1149 goto error1;
1150 }
1151 cm_id->service_id = param->service_id;
1152 cm_id->service_mask = ~cpu_to_be64(0);
1153 cm_id_priv->timeout_ms = cm_convert_to_ms(
1154 param->primary_path->packet_life_time) * 2 +
1155 cm_convert_to_ms(
1156 param->remote_cm_response_timeout);
1157 cm_id_priv->max_cm_retries = param->max_cm_retries;
1158 cm_id_priv->initiator_depth = param->initiator_depth;
1159 cm_id_priv->responder_resources = param->responder_resources;
1160 cm_id_priv->retry_count = param->retry_count;
1161 cm_id_priv->path_mtu = param->primary_path->mtu;
1162 cm_id_priv->pkey = param->primary_path->pkey;
1163 cm_id_priv->qp_type = param->qp_type;
1164
1165 ret = cm_alloc_msg(cm_id_priv, &cm_id_priv->msg);
1166 if (ret)
1167 goto error1;
1168
1169 req_msg = (struct cm_req_msg *) cm_id_priv->msg->mad;
1170 cm_format_req(req_msg, cm_id_priv, param);
1171 cm_id_priv->tid = req_msg->hdr.tid;
1172 cm_id_priv->msg->timeout_ms = cm_id_priv->timeout_ms;
1173 cm_id_priv->msg->context[1] = (void *) (unsigned long) IB_CM_REQ_SENT;
1174
1175 cm_id_priv->local_qpn = cm_req_get_local_qpn(req_msg);
1176 cm_id_priv->rq_psn = cm_req_get_starting_psn(req_msg);
1177
1178 spin_lock_irqsave(&cm_id_priv->lock, flags);
1179 ret = ib_post_send_mad(cm_id_priv->msg, NULL);
1180 if (ret) {
1181 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1182 goto error2;
1183 }
1184 BUG_ON(cm_id->state != IB_CM_IDLE);
1185 cm_id->state = IB_CM_REQ_SENT;
1186 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1187 return 0;
1188
1189 error2: cm_free_msg(cm_id_priv->msg);
1190 error1: kfree(cm_id_priv->timewait_info);
1191 out: return ret;
1192 }
1193 EXPORT_SYMBOL(ib_send_cm_req);
1194
cm_issue_rej(struct cm_port * port,struct ib_mad_recv_wc * mad_recv_wc,enum ib_cm_rej_reason reason,enum cm_msg_response msg_rejected,void * ari,u8 ari_length)1195 static int cm_issue_rej(struct cm_port *port,
1196 struct ib_mad_recv_wc *mad_recv_wc,
1197 enum ib_cm_rej_reason reason,
1198 enum cm_msg_response msg_rejected,
1199 void *ari, u8 ari_length)
1200 {
1201 struct ib_mad_send_buf *msg = NULL;
1202 struct cm_rej_msg *rej_msg, *rcv_msg;
1203 int ret;
1204
1205 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
1206 if (ret)
1207 return ret;
1208
1209 /* We just need common CM header information. Cast to any message. */
1210 rcv_msg = (struct cm_rej_msg *) mad_recv_wc->recv_buf.mad;
1211 rej_msg = (struct cm_rej_msg *) msg->mad;
1212
1213 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, rcv_msg->hdr.tid);
1214 rej_msg->remote_comm_id = rcv_msg->local_comm_id;
1215 rej_msg->local_comm_id = rcv_msg->remote_comm_id;
1216 cm_rej_set_msg_rejected(rej_msg, msg_rejected);
1217 rej_msg->reason = cpu_to_be16(reason);
1218
1219 if (ari && ari_length) {
1220 cm_rej_set_reject_info_len(rej_msg, ari_length);
1221 memcpy(rej_msg->ari, ari, ari_length);
1222 }
1223
1224 ret = ib_post_send_mad(msg, NULL);
1225 if (ret)
1226 cm_free_msg(msg);
1227
1228 return ret;
1229 }
1230
cm_is_active_peer(__be64 local_ca_guid,__be64 remote_ca_guid,__be32 local_qpn,__be32 remote_qpn)1231 static inline int cm_is_active_peer(__be64 local_ca_guid, __be64 remote_ca_guid,
1232 __be32 local_qpn, __be32 remote_qpn)
1233 {
1234 return (be64_to_cpu(local_ca_guid) > be64_to_cpu(remote_ca_guid) ||
1235 ((local_ca_guid == remote_ca_guid) &&
1236 (be32_to_cpu(local_qpn) > be32_to_cpu(remote_qpn))));
1237 }
1238
cm_format_paths_from_req(struct cm_req_msg * req_msg,struct ib_sa_path_rec * primary_path,struct ib_sa_path_rec * alt_path)1239 static void cm_format_paths_from_req(struct cm_req_msg *req_msg,
1240 struct ib_sa_path_rec *primary_path,
1241 struct ib_sa_path_rec *alt_path)
1242 {
1243 memset(primary_path, 0, sizeof *primary_path);
1244 primary_path->dgid = req_msg->primary_local_gid;
1245 primary_path->sgid = req_msg->primary_remote_gid;
1246 primary_path->dlid = req_msg->primary_local_lid;
1247 primary_path->slid = req_msg->primary_remote_lid;
1248 primary_path->flow_label = cm_req_get_primary_flow_label(req_msg);
1249 primary_path->hop_limit = req_msg->primary_hop_limit;
1250 primary_path->traffic_class = req_msg->primary_traffic_class;
1251 primary_path->reversible = 1;
1252 primary_path->pkey = req_msg->pkey;
1253 primary_path->sl = cm_req_get_primary_sl(req_msg);
1254 primary_path->mtu_selector = IB_SA_EQ;
1255 primary_path->mtu = cm_req_get_path_mtu(req_msg);
1256 primary_path->rate_selector = IB_SA_EQ;
1257 primary_path->rate = cm_req_get_primary_packet_rate(req_msg);
1258 primary_path->packet_life_time_selector = IB_SA_EQ;
1259 primary_path->packet_life_time =
1260 cm_req_get_primary_local_ack_timeout(req_msg);
1261 primary_path->packet_life_time -= (primary_path->packet_life_time > 0);
1262
1263 if (req_msg->alt_local_lid) {
1264 memset(alt_path, 0, sizeof *alt_path);
1265 alt_path->dgid = req_msg->alt_local_gid;
1266 alt_path->sgid = req_msg->alt_remote_gid;
1267 alt_path->dlid = req_msg->alt_local_lid;
1268 alt_path->slid = req_msg->alt_remote_lid;
1269 alt_path->flow_label = cm_req_get_alt_flow_label(req_msg);
1270 alt_path->hop_limit = req_msg->alt_hop_limit;
1271 alt_path->traffic_class = req_msg->alt_traffic_class;
1272 alt_path->reversible = 1;
1273 alt_path->pkey = req_msg->pkey;
1274 alt_path->sl = cm_req_get_alt_sl(req_msg);
1275 alt_path->mtu_selector = IB_SA_EQ;
1276 alt_path->mtu = cm_req_get_path_mtu(req_msg);
1277 alt_path->rate_selector = IB_SA_EQ;
1278 alt_path->rate = cm_req_get_alt_packet_rate(req_msg);
1279 alt_path->packet_life_time_selector = IB_SA_EQ;
1280 alt_path->packet_life_time =
1281 cm_req_get_alt_local_ack_timeout(req_msg);
1282 alt_path->packet_life_time -= (alt_path->packet_life_time > 0);
1283 }
1284 }
1285
cm_format_req_event(struct cm_work * work,struct cm_id_private * cm_id_priv,struct ib_cm_id * listen_id)1286 static void cm_format_req_event(struct cm_work *work,
1287 struct cm_id_private *cm_id_priv,
1288 struct ib_cm_id *listen_id)
1289 {
1290 struct cm_req_msg *req_msg;
1291 struct ib_cm_req_event_param *param;
1292
1293 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1294 param = &work->cm_event.param.req_rcvd;
1295 param->listen_id = listen_id;
1296 param->port = cm_id_priv->av.port->port_num;
1297 param->primary_path = &work->path[0];
1298 if (req_msg->alt_local_lid)
1299 param->alternate_path = &work->path[1];
1300 else
1301 param->alternate_path = NULL;
1302 param->remote_ca_guid = req_msg->local_ca_guid;
1303 param->remote_qkey = be32_to_cpu(req_msg->local_qkey);
1304 param->remote_qpn = be32_to_cpu(cm_req_get_local_qpn(req_msg));
1305 param->qp_type = cm_req_get_qp_type(req_msg);
1306 param->starting_psn = be32_to_cpu(cm_req_get_starting_psn(req_msg));
1307 param->responder_resources = cm_req_get_init_depth(req_msg);
1308 param->initiator_depth = cm_req_get_resp_res(req_msg);
1309 param->local_cm_response_timeout =
1310 cm_req_get_remote_resp_timeout(req_msg);
1311 param->flow_control = cm_req_get_flow_ctrl(req_msg);
1312 param->remote_cm_response_timeout =
1313 cm_req_get_local_resp_timeout(req_msg);
1314 param->retry_count = cm_req_get_retry_count(req_msg);
1315 param->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1316 param->srq = cm_req_get_srq(req_msg);
1317 work->cm_event.private_data = &req_msg->private_data;
1318 }
1319
cm_process_work(struct cm_id_private * cm_id_priv,struct cm_work * work)1320 static void cm_process_work(struct cm_id_private *cm_id_priv,
1321 struct cm_work *work)
1322 {
1323 int ret;
1324
1325 /* We will typically only have the current event to report. */
1326 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &work->cm_event);
1327 cm_free_work(work);
1328
1329 while (!ret && !atomic_add_negative(-1, &cm_id_priv->work_count)) {
1330 spin_lock_irq(&cm_id_priv->lock);
1331 work = cm_dequeue_work(cm_id_priv);
1332 spin_unlock_irq(&cm_id_priv->lock);
1333 BUG_ON(!work);
1334 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id,
1335 &work->cm_event);
1336 cm_free_work(work);
1337 }
1338 cm_deref_id(cm_id_priv);
1339 if (ret)
1340 cm_destroy_id(&cm_id_priv->id, ret);
1341 }
1342
cm_format_mra(struct cm_mra_msg * mra_msg,struct cm_id_private * cm_id_priv,enum cm_msg_response msg_mraed,u8 service_timeout,const void * private_data,u8 private_data_len)1343 static void cm_format_mra(struct cm_mra_msg *mra_msg,
1344 struct cm_id_private *cm_id_priv,
1345 enum cm_msg_response msg_mraed, u8 service_timeout,
1346 const void *private_data, u8 private_data_len)
1347 {
1348 cm_format_mad_hdr(&mra_msg->hdr, CM_MRA_ATTR_ID, cm_id_priv->tid);
1349 cm_mra_set_msg_mraed(mra_msg, msg_mraed);
1350 mra_msg->local_comm_id = cm_id_priv->id.local_id;
1351 mra_msg->remote_comm_id = cm_id_priv->id.remote_id;
1352 cm_mra_set_service_timeout(mra_msg, service_timeout);
1353
1354 if (private_data && private_data_len)
1355 memcpy(mra_msg->private_data, private_data, private_data_len);
1356 }
1357
cm_format_rej(struct cm_rej_msg * rej_msg,struct cm_id_private * cm_id_priv,enum ib_cm_rej_reason reason,void * ari,u8 ari_length,const void * private_data,u8 private_data_len)1358 static void cm_format_rej(struct cm_rej_msg *rej_msg,
1359 struct cm_id_private *cm_id_priv,
1360 enum ib_cm_rej_reason reason,
1361 void *ari,
1362 u8 ari_length,
1363 const void *private_data,
1364 u8 private_data_len)
1365 {
1366 cm_format_mad_hdr(&rej_msg->hdr, CM_REJ_ATTR_ID, cm_id_priv->tid);
1367 rej_msg->remote_comm_id = cm_id_priv->id.remote_id;
1368
1369 switch(cm_id_priv->id.state) {
1370 case IB_CM_REQ_RCVD:
1371 rej_msg->local_comm_id = 0;
1372 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1373 break;
1374 case IB_CM_MRA_REQ_SENT:
1375 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1376 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REQ);
1377 break;
1378 case IB_CM_REP_RCVD:
1379 case IB_CM_MRA_REP_SENT:
1380 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1381 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_REP);
1382 break;
1383 default:
1384 rej_msg->local_comm_id = cm_id_priv->id.local_id;
1385 cm_rej_set_msg_rejected(rej_msg, CM_MSG_RESPONSE_OTHER);
1386 break;
1387 }
1388
1389 rej_msg->reason = cpu_to_be16(reason);
1390 if (ari && ari_length) {
1391 cm_rej_set_reject_info_len(rej_msg, ari_length);
1392 memcpy(rej_msg->ari, ari, ari_length);
1393 }
1394
1395 if (private_data && private_data_len)
1396 memcpy(rej_msg->private_data, private_data, private_data_len);
1397 }
1398
cm_dup_req_handler(struct cm_work * work,struct cm_id_private * cm_id_priv)1399 static void cm_dup_req_handler(struct cm_work *work,
1400 struct cm_id_private *cm_id_priv)
1401 {
1402 struct ib_mad_send_buf *msg = NULL;
1403 int ret;
1404
1405 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1406 counter[CM_REQ_COUNTER]);
1407
1408 /* Quick state check to discard duplicate REQs. */
1409 if (cm_id_priv->id.state == IB_CM_REQ_RCVD)
1410 return;
1411
1412 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1413 if (ret)
1414 return;
1415
1416 spin_lock_irq(&cm_id_priv->lock);
1417 switch (cm_id_priv->id.state) {
1418 case IB_CM_MRA_REQ_SENT:
1419 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1420 CM_MSG_RESPONSE_REQ, cm_id_priv->service_timeout,
1421 cm_id_priv->private_data,
1422 cm_id_priv->private_data_len);
1423 break;
1424 case IB_CM_TIMEWAIT:
1425 cm_format_rej((struct cm_rej_msg *) msg->mad, cm_id_priv,
1426 IB_CM_REJ_STALE_CONN, NULL, 0, NULL, 0);
1427 break;
1428 default:
1429 goto unlock;
1430 }
1431 spin_unlock_irq(&cm_id_priv->lock);
1432
1433 ret = ib_post_send_mad(msg, NULL);
1434 if (ret)
1435 goto free;
1436 return;
1437
1438 unlock: spin_unlock_irq(&cm_id_priv->lock);
1439 free: cm_free_msg(msg);
1440 }
1441
cm_match_req(struct cm_work * work,struct cm_id_private * cm_id_priv)1442 static struct cm_id_private * cm_match_req(struct cm_work *work,
1443 struct cm_id_private *cm_id_priv)
1444 {
1445 struct cm_id_private *listen_cm_id_priv, *cur_cm_id_priv;
1446 struct cm_timewait_info *timewait_info;
1447 struct cm_req_msg *req_msg;
1448
1449 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1450
1451 /* Check for possible duplicate REQ. */
1452 spin_lock_irq(&cm.lock);
1453 timewait_info = cm_insert_remote_id(cm_id_priv->timewait_info);
1454 if (timewait_info) {
1455 cur_cm_id_priv = cm_get_id(timewait_info->work.local_id,
1456 timewait_info->work.remote_id);
1457 spin_unlock_irq(&cm.lock);
1458 if (cur_cm_id_priv) {
1459 cm_dup_req_handler(work, cur_cm_id_priv);
1460 cm_deref_id(cur_cm_id_priv);
1461 }
1462 return NULL;
1463 }
1464
1465 /* Check for stale connections. */
1466 timewait_info = cm_insert_remote_qpn(cm_id_priv->timewait_info);
1467 if (timewait_info) {
1468 cm_cleanup_timewait(cm_id_priv->timewait_info);
1469 spin_unlock_irq(&cm.lock);
1470 cm_issue_rej(work->port, work->mad_recv_wc,
1471 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REQ,
1472 NULL, 0);
1473 return NULL;
1474 }
1475
1476 /* Find matching listen request. */
1477 listen_cm_id_priv = cm_find_listen(cm_id_priv->id.device,
1478 req_msg->service_id,
1479 req_msg->private_data);
1480 if (!listen_cm_id_priv) {
1481 cm_cleanup_timewait(cm_id_priv->timewait_info);
1482 spin_unlock_irq(&cm.lock);
1483 cm_issue_rej(work->port, work->mad_recv_wc,
1484 IB_CM_REJ_INVALID_SERVICE_ID, CM_MSG_RESPONSE_REQ,
1485 NULL, 0);
1486 goto out;
1487 }
1488 atomic_inc(&listen_cm_id_priv->refcount);
1489 atomic_inc(&cm_id_priv->refcount);
1490 cm_id_priv->id.state = IB_CM_REQ_RCVD;
1491 atomic_inc(&cm_id_priv->work_count);
1492 spin_unlock_irq(&cm.lock);
1493 out:
1494 return listen_cm_id_priv;
1495 }
1496
1497 /*
1498 * Work-around for inter-subnet connections. If the LIDs are permissive,
1499 * we need to override the LID/SL data in the REQ with the LID information
1500 * in the work completion.
1501 */
cm_process_routed_req(struct cm_req_msg * req_msg,struct ib_wc * wc)1502 static void cm_process_routed_req(struct cm_req_msg *req_msg, struct ib_wc *wc)
1503 {
1504 if (!cm_req_get_primary_subnet_local(req_msg)) {
1505 if (req_msg->primary_local_lid == IB_LID_PERMISSIVE) {
1506 req_msg->primary_local_lid = cpu_to_be16(wc->slid);
1507 cm_req_set_primary_sl(req_msg, wc->sl);
1508 }
1509
1510 if (req_msg->primary_remote_lid == IB_LID_PERMISSIVE)
1511 req_msg->primary_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1512 }
1513
1514 if (!cm_req_get_alt_subnet_local(req_msg)) {
1515 if (req_msg->alt_local_lid == IB_LID_PERMISSIVE) {
1516 req_msg->alt_local_lid = cpu_to_be16(wc->slid);
1517 cm_req_set_alt_sl(req_msg, wc->sl);
1518 }
1519
1520 if (req_msg->alt_remote_lid == IB_LID_PERMISSIVE)
1521 req_msg->alt_remote_lid = cpu_to_be16(wc->dlid_path_bits);
1522 }
1523 }
1524
cm_req_handler(struct cm_work * work)1525 static int cm_req_handler(struct cm_work *work)
1526 {
1527 struct ib_cm_id *cm_id;
1528 struct cm_id_private *cm_id_priv, *listen_cm_id_priv;
1529 struct cm_req_msg *req_msg;
1530 int ret;
1531
1532 req_msg = (struct cm_req_msg *)work->mad_recv_wc->recv_buf.mad;
1533
1534 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
1535 if (IS_ERR(cm_id))
1536 return PTR_ERR(cm_id);
1537
1538 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1539 cm_id_priv->id.remote_id = req_msg->local_comm_id;
1540 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
1541 work->mad_recv_wc->recv_buf.grh,
1542 &cm_id_priv->av);
1543 cm_id_priv->timewait_info = cm_create_timewait_info(cm_id_priv->
1544 id.local_id);
1545 if (IS_ERR(cm_id_priv->timewait_info)) {
1546 ret = PTR_ERR(cm_id_priv->timewait_info);
1547 goto destroy;
1548 }
1549 cm_id_priv->timewait_info->work.remote_id = req_msg->local_comm_id;
1550 cm_id_priv->timewait_info->remote_ca_guid = req_msg->local_ca_guid;
1551 cm_id_priv->timewait_info->remote_qpn = cm_req_get_local_qpn(req_msg);
1552
1553 listen_cm_id_priv = cm_match_req(work, cm_id_priv);
1554 if (!listen_cm_id_priv) {
1555 ret = -EINVAL;
1556 kfree(cm_id_priv->timewait_info);
1557 goto destroy;
1558 }
1559
1560 cm_id_priv->id.cm_handler = listen_cm_id_priv->id.cm_handler;
1561 cm_id_priv->id.context = listen_cm_id_priv->id.context;
1562 cm_id_priv->id.service_id = req_msg->service_id;
1563 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
1564
1565 cm_process_routed_req(req_msg, work->mad_recv_wc->wc);
1566 cm_format_paths_from_req(req_msg, &work->path[0], &work->path[1]);
1567
1568 memcpy(work->path[0].dmac, cm_id_priv->av.ah_attr.dmac, ETH_ALEN);
1569 work->path[0].vlan_id = cm_id_priv->av.ah_attr.vlan_id;
1570 ret = cm_init_av_by_path(&work->path[0], &cm_id_priv->av);
1571 if (ret) {
1572 ib_get_cached_gid(work->port->cm_dev->ib_device,
1573 work->port->port_num, 0, &work->path[0].sgid);
1574 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_GID,
1575 &work->path[0].sgid, sizeof work->path[0].sgid,
1576 NULL, 0);
1577 goto rejected;
1578 }
1579 if (req_msg->alt_local_lid) {
1580 ret = cm_init_av_by_path(&work->path[1], &cm_id_priv->alt_av);
1581 if (ret) {
1582 ib_send_cm_rej(cm_id, IB_CM_REJ_INVALID_ALT_GID,
1583 &work->path[0].sgid,
1584 sizeof work->path[0].sgid, NULL, 0);
1585 goto rejected;
1586 }
1587 }
1588 cm_id_priv->tid = req_msg->hdr.tid;
1589 cm_id_priv->timeout_ms = cm_convert_to_ms(
1590 cm_req_get_local_resp_timeout(req_msg));
1591 cm_id_priv->max_cm_retries = cm_req_get_max_cm_retries(req_msg);
1592 cm_id_priv->remote_qpn = cm_req_get_local_qpn(req_msg);
1593 cm_id_priv->initiator_depth = cm_req_get_resp_res(req_msg);
1594 cm_id_priv->responder_resources = cm_req_get_init_depth(req_msg);
1595 cm_id_priv->path_mtu = cm_req_get_path_mtu(req_msg);
1596 cm_id_priv->pkey = req_msg->pkey;
1597 cm_id_priv->sq_psn = cm_req_get_starting_psn(req_msg);
1598 cm_id_priv->retry_count = cm_req_get_retry_count(req_msg);
1599 cm_id_priv->rnr_retry_count = cm_req_get_rnr_retry_count(req_msg);
1600 cm_id_priv->qp_type = cm_req_get_qp_type(req_msg);
1601
1602 cm_format_req_event(work, cm_id_priv, &listen_cm_id_priv->id);
1603 cm_process_work(cm_id_priv, work);
1604 cm_deref_id(listen_cm_id_priv);
1605 return 0;
1606
1607 rejected:
1608 atomic_dec(&cm_id_priv->refcount);
1609 cm_deref_id(listen_cm_id_priv);
1610 destroy:
1611 ib_destroy_cm_id(cm_id);
1612 return ret;
1613 }
1614
cm_format_rep(struct cm_rep_msg * rep_msg,struct cm_id_private * cm_id_priv,struct ib_cm_rep_param * param)1615 static void cm_format_rep(struct cm_rep_msg *rep_msg,
1616 struct cm_id_private *cm_id_priv,
1617 struct ib_cm_rep_param *param)
1618 {
1619 cm_format_mad_hdr(&rep_msg->hdr, CM_REP_ATTR_ID, cm_id_priv->tid);
1620 rep_msg->local_comm_id = cm_id_priv->id.local_id;
1621 rep_msg->remote_comm_id = cm_id_priv->id.remote_id;
1622 cm_rep_set_starting_psn(rep_msg, cpu_to_be32(param->starting_psn));
1623 rep_msg->resp_resources = param->responder_resources;
1624 cm_rep_set_target_ack_delay(rep_msg,
1625 cm_id_priv->av.port->cm_dev->ack_delay);
1626 cm_rep_set_failover(rep_msg, param->failover_accepted);
1627 cm_rep_set_rnr_retry_count(rep_msg, param->rnr_retry_count);
1628 rep_msg->local_ca_guid = cm_id_priv->id.device->node_guid;
1629
1630 if (cm_id_priv->qp_type != IB_QPT_XRC_TGT) {
1631 rep_msg->initiator_depth = param->initiator_depth;
1632 cm_rep_set_flow_ctrl(rep_msg, param->flow_control);
1633 cm_rep_set_srq(rep_msg, param->srq);
1634 cm_rep_set_local_qpn(rep_msg, cpu_to_be32(param->qp_num));
1635 } else {
1636 cm_rep_set_srq(rep_msg, 1);
1637 cm_rep_set_local_eecn(rep_msg, cpu_to_be32(param->qp_num));
1638 }
1639
1640 if (param->private_data && param->private_data_len)
1641 memcpy(rep_msg->private_data, param->private_data,
1642 param->private_data_len);
1643 }
1644
ib_send_cm_rep(struct ib_cm_id * cm_id,struct ib_cm_rep_param * param)1645 int ib_send_cm_rep(struct ib_cm_id *cm_id,
1646 struct ib_cm_rep_param *param)
1647 {
1648 struct cm_id_private *cm_id_priv;
1649 struct ib_mad_send_buf *msg;
1650 struct cm_rep_msg *rep_msg;
1651 unsigned long flags;
1652 int ret;
1653
1654 if (param->private_data &&
1655 param->private_data_len > IB_CM_REP_PRIVATE_DATA_SIZE)
1656 return -EINVAL;
1657
1658 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1659 spin_lock_irqsave(&cm_id_priv->lock, flags);
1660 if (cm_id->state != IB_CM_REQ_RCVD &&
1661 cm_id->state != IB_CM_MRA_REQ_SENT) {
1662 ret = -EINVAL;
1663 goto out;
1664 }
1665
1666 ret = cm_alloc_msg(cm_id_priv, &msg);
1667 if (ret)
1668 goto out;
1669
1670 rep_msg = (struct cm_rep_msg *) msg->mad;
1671 cm_format_rep(rep_msg, cm_id_priv, param);
1672 msg->timeout_ms = cm_id_priv->timeout_ms;
1673 msg->context[1] = (void *) (unsigned long) IB_CM_REP_SENT;
1674
1675 ret = ib_post_send_mad(msg, NULL);
1676 if (ret) {
1677 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1678 cm_free_msg(msg);
1679 return ret;
1680 }
1681
1682 cm_id->state = IB_CM_REP_SENT;
1683 cm_id_priv->msg = msg;
1684 cm_id_priv->initiator_depth = param->initiator_depth;
1685 cm_id_priv->responder_resources = param->responder_resources;
1686 cm_id_priv->rq_psn = cm_rep_get_starting_psn(rep_msg);
1687 cm_id_priv->local_qpn = cpu_to_be32(param->qp_num & 0xFFFFFF);
1688
1689 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1690 return ret;
1691 }
1692 EXPORT_SYMBOL(ib_send_cm_rep);
1693
cm_format_rtu(struct cm_rtu_msg * rtu_msg,struct cm_id_private * cm_id_priv,const void * private_data,u8 private_data_len)1694 static void cm_format_rtu(struct cm_rtu_msg *rtu_msg,
1695 struct cm_id_private *cm_id_priv,
1696 const void *private_data,
1697 u8 private_data_len)
1698 {
1699 cm_format_mad_hdr(&rtu_msg->hdr, CM_RTU_ATTR_ID, cm_id_priv->tid);
1700 rtu_msg->local_comm_id = cm_id_priv->id.local_id;
1701 rtu_msg->remote_comm_id = cm_id_priv->id.remote_id;
1702
1703 if (private_data && private_data_len)
1704 memcpy(rtu_msg->private_data, private_data, private_data_len);
1705 }
1706
ib_send_cm_rtu(struct ib_cm_id * cm_id,const void * private_data,u8 private_data_len)1707 int ib_send_cm_rtu(struct ib_cm_id *cm_id,
1708 const void *private_data,
1709 u8 private_data_len)
1710 {
1711 struct cm_id_private *cm_id_priv;
1712 struct ib_mad_send_buf *msg;
1713 unsigned long flags;
1714 void *data;
1715 int ret;
1716
1717 if (private_data && private_data_len > IB_CM_RTU_PRIVATE_DATA_SIZE)
1718 return -EINVAL;
1719
1720 data = cm_copy_private_data(private_data, private_data_len);
1721 if (IS_ERR(data))
1722 return PTR_ERR(data);
1723
1724 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
1725 spin_lock_irqsave(&cm_id_priv->lock, flags);
1726 if (cm_id->state != IB_CM_REP_RCVD &&
1727 cm_id->state != IB_CM_MRA_REP_SENT) {
1728 ret = -EINVAL;
1729 goto error;
1730 }
1731
1732 ret = cm_alloc_msg(cm_id_priv, &msg);
1733 if (ret)
1734 goto error;
1735
1736 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1737 private_data, private_data_len);
1738
1739 ret = ib_post_send_mad(msg, NULL);
1740 if (ret) {
1741 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1742 cm_free_msg(msg);
1743 kfree(data);
1744 return ret;
1745 }
1746
1747 cm_id->state = IB_CM_ESTABLISHED;
1748 cm_set_private_data(cm_id_priv, data, private_data_len);
1749 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1750 return 0;
1751
1752 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1753 kfree(data);
1754 return ret;
1755 }
1756 EXPORT_SYMBOL(ib_send_cm_rtu);
1757
cm_format_rep_event(struct cm_work * work,enum ib_qp_type qp_type)1758 static void cm_format_rep_event(struct cm_work *work, enum ib_qp_type qp_type)
1759 {
1760 struct cm_rep_msg *rep_msg;
1761 struct ib_cm_rep_event_param *param;
1762
1763 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1764 param = &work->cm_event.param.rep_rcvd;
1765 param->remote_ca_guid = rep_msg->local_ca_guid;
1766 param->remote_qkey = be32_to_cpu(rep_msg->local_qkey);
1767 param->remote_qpn = be32_to_cpu(cm_rep_get_qpn(rep_msg, qp_type));
1768 param->starting_psn = be32_to_cpu(cm_rep_get_starting_psn(rep_msg));
1769 param->responder_resources = rep_msg->initiator_depth;
1770 param->initiator_depth = rep_msg->resp_resources;
1771 param->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1772 param->failover_accepted = cm_rep_get_failover(rep_msg);
1773 param->flow_control = cm_rep_get_flow_ctrl(rep_msg);
1774 param->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1775 param->srq = cm_rep_get_srq(rep_msg);
1776 work->cm_event.private_data = &rep_msg->private_data;
1777 }
1778
cm_dup_rep_handler(struct cm_work * work)1779 static void cm_dup_rep_handler(struct cm_work *work)
1780 {
1781 struct cm_id_private *cm_id_priv;
1782 struct cm_rep_msg *rep_msg;
1783 struct ib_mad_send_buf *msg = NULL;
1784 int ret;
1785
1786 rep_msg = (struct cm_rep_msg *) work->mad_recv_wc->recv_buf.mad;
1787 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id,
1788 rep_msg->local_comm_id);
1789 if (!cm_id_priv)
1790 return;
1791
1792 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1793 counter[CM_REP_COUNTER]);
1794 ret = cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg);
1795 if (ret)
1796 goto deref;
1797
1798 spin_lock_irq(&cm_id_priv->lock);
1799 if (cm_id_priv->id.state == IB_CM_ESTABLISHED)
1800 cm_format_rtu((struct cm_rtu_msg *) msg->mad, cm_id_priv,
1801 cm_id_priv->private_data,
1802 cm_id_priv->private_data_len);
1803 else if (cm_id_priv->id.state == IB_CM_MRA_REP_SENT)
1804 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
1805 CM_MSG_RESPONSE_REP, cm_id_priv->service_timeout,
1806 cm_id_priv->private_data,
1807 cm_id_priv->private_data_len);
1808 else
1809 goto unlock;
1810 spin_unlock_irq(&cm_id_priv->lock);
1811
1812 ret = ib_post_send_mad(msg, NULL);
1813 if (ret)
1814 goto free;
1815 goto deref;
1816
1817 unlock: spin_unlock_irq(&cm_id_priv->lock);
1818 free: cm_free_msg(msg);
1819 deref: cm_deref_id(cm_id_priv);
1820 }
1821
cm_rep_handler(struct cm_work * work)1822 static int cm_rep_handler(struct cm_work *work)
1823 {
1824 struct cm_id_private *cm_id_priv;
1825 struct cm_rep_msg *rep_msg;
1826 int ret;
1827
1828 rep_msg = (struct cm_rep_msg *)work->mad_recv_wc->recv_buf.mad;
1829 cm_id_priv = cm_acquire_id(rep_msg->remote_comm_id, 0);
1830 if (!cm_id_priv) {
1831 cm_dup_rep_handler(work);
1832 return -EINVAL;
1833 }
1834
1835 cm_format_rep_event(work, cm_id_priv->qp_type);
1836
1837 spin_lock_irq(&cm_id_priv->lock);
1838 switch (cm_id_priv->id.state) {
1839 case IB_CM_REQ_SENT:
1840 case IB_CM_MRA_REQ_RCVD:
1841 break;
1842 default:
1843 spin_unlock_irq(&cm_id_priv->lock);
1844 ret = -EINVAL;
1845 goto error;
1846 }
1847
1848 cm_id_priv->timewait_info->work.remote_id = rep_msg->local_comm_id;
1849 cm_id_priv->timewait_info->remote_ca_guid = rep_msg->local_ca_guid;
1850 cm_id_priv->timewait_info->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
1851
1852 spin_lock(&cm.lock);
1853 /* Check for duplicate REP. */
1854 if (cm_insert_remote_id(cm_id_priv->timewait_info)) {
1855 spin_unlock(&cm.lock);
1856 spin_unlock_irq(&cm_id_priv->lock);
1857 ret = -EINVAL;
1858 goto error;
1859 }
1860 /* Check for a stale connection. */
1861 if (cm_insert_remote_qpn(cm_id_priv->timewait_info)) {
1862 rb_erase(&cm_id_priv->timewait_info->remote_id_node,
1863 &cm.remote_id_table);
1864 cm_id_priv->timewait_info->inserted_remote_id = 0;
1865 spin_unlock(&cm.lock);
1866 spin_unlock_irq(&cm_id_priv->lock);
1867 cm_issue_rej(work->port, work->mad_recv_wc,
1868 IB_CM_REJ_STALE_CONN, CM_MSG_RESPONSE_REP,
1869 NULL, 0);
1870 ret = -EINVAL;
1871 goto error;
1872 }
1873 spin_unlock(&cm.lock);
1874
1875 cm_id_priv->id.state = IB_CM_REP_RCVD;
1876 cm_id_priv->id.remote_id = rep_msg->local_comm_id;
1877 cm_id_priv->remote_qpn = cm_rep_get_qpn(rep_msg, cm_id_priv->qp_type);
1878 cm_id_priv->initiator_depth = rep_msg->resp_resources;
1879 cm_id_priv->responder_resources = rep_msg->initiator_depth;
1880 cm_id_priv->sq_psn = cm_rep_get_starting_psn(rep_msg);
1881 cm_id_priv->rnr_retry_count = cm_rep_get_rnr_retry_count(rep_msg);
1882 cm_id_priv->target_ack_delay = cm_rep_get_target_ack_delay(rep_msg);
1883 cm_id_priv->av.timeout =
1884 cm_ack_timeout(cm_id_priv->target_ack_delay,
1885 cm_id_priv->av.timeout - 1);
1886 cm_id_priv->alt_av.timeout =
1887 cm_ack_timeout(cm_id_priv->target_ack_delay,
1888 cm_id_priv->alt_av.timeout - 1);
1889
1890 /* todo: handle peer_to_peer */
1891
1892 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1893 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1894 if (!ret)
1895 list_add_tail(&work->list, &cm_id_priv->work_list);
1896 spin_unlock_irq(&cm_id_priv->lock);
1897
1898 if (ret)
1899 cm_process_work(cm_id_priv, work);
1900 else
1901 cm_deref_id(cm_id_priv);
1902 return 0;
1903
1904 error:
1905 cm_deref_id(cm_id_priv);
1906 return ret;
1907 }
1908
cm_establish_handler(struct cm_work * work)1909 static int cm_establish_handler(struct cm_work *work)
1910 {
1911 struct cm_id_private *cm_id_priv;
1912 int ret;
1913
1914 /* See comment in cm_establish about lookup. */
1915 cm_id_priv = cm_acquire_id(work->local_id, work->remote_id);
1916 if (!cm_id_priv)
1917 return -EINVAL;
1918
1919 spin_lock_irq(&cm_id_priv->lock);
1920 if (cm_id_priv->id.state != IB_CM_ESTABLISHED) {
1921 spin_unlock_irq(&cm_id_priv->lock);
1922 goto out;
1923 }
1924
1925 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1926 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1927 if (!ret)
1928 list_add_tail(&work->list, &cm_id_priv->work_list);
1929 spin_unlock_irq(&cm_id_priv->lock);
1930
1931 if (ret)
1932 cm_process_work(cm_id_priv, work);
1933 else
1934 cm_deref_id(cm_id_priv);
1935 return 0;
1936 out:
1937 cm_deref_id(cm_id_priv);
1938 return -EINVAL;
1939 }
1940
cm_rtu_handler(struct cm_work * work)1941 static int cm_rtu_handler(struct cm_work *work)
1942 {
1943 struct cm_id_private *cm_id_priv;
1944 struct cm_rtu_msg *rtu_msg;
1945 int ret;
1946
1947 rtu_msg = (struct cm_rtu_msg *)work->mad_recv_wc->recv_buf.mad;
1948 cm_id_priv = cm_acquire_id(rtu_msg->remote_comm_id,
1949 rtu_msg->local_comm_id);
1950 if (!cm_id_priv)
1951 return -EINVAL;
1952
1953 work->cm_event.private_data = &rtu_msg->private_data;
1954
1955 spin_lock_irq(&cm_id_priv->lock);
1956 if (cm_id_priv->id.state != IB_CM_REP_SENT &&
1957 cm_id_priv->id.state != IB_CM_MRA_REP_RCVD) {
1958 spin_unlock_irq(&cm_id_priv->lock);
1959 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
1960 counter[CM_RTU_COUNTER]);
1961 goto out;
1962 }
1963 cm_id_priv->id.state = IB_CM_ESTABLISHED;
1964
1965 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
1966 ret = atomic_inc_and_test(&cm_id_priv->work_count);
1967 if (!ret)
1968 list_add_tail(&work->list, &cm_id_priv->work_list);
1969 spin_unlock_irq(&cm_id_priv->lock);
1970
1971 if (ret)
1972 cm_process_work(cm_id_priv, work);
1973 else
1974 cm_deref_id(cm_id_priv);
1975 return 0;
1976 out:
1977 cm_deref_id(cm_id_priv);
1978 return -EINVAL;
1979 }
1980
cm_format_dreq(struct cm_dreq_msg * dreq_msg,struct cm_id_private * cm_id_priv,const void * private_data,u8 private_data_len)1981 static void cm_format_dreq(struct cm_dreq_msg *dreq_msg,
1982 struct cm_id_private *cm_id_priv,
1983 const void *private_data,
1984 u8 private_data_len)
1985 {
1986 cm_format_mad_hdr(&dreq_msg->hdr, CM_DREQ_ATTR_ID,
1987 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_DREQ));
1988 dreq_msg->local_comm_id = cm_id_priv->id.local_id;
1989 dreq_msg->remote_comm_id = cm_id_priv->id.remote_id;
1990 cm_dreq_set_remote_qpn(dreq_msg, cm_id_priv->remote_qpn);
1991
1992 if (private_data && private_data_len)
1993 memcpy(dreq_msg->private_data, private_data, private_data_len);
1994 }
1995
ib_send_cm_dreq(struct ib_cm_id * cm_id,const void * private_data,u8 private_data_len)1996 int ib_send_cm_dreq(struct ib_cm_id *cm_id,
1997 const void *private_data,
1998 u8 private_data_len)
1999 {
2000 struct cm_id_private *cm_id_priv;
2001 struct ib_mad_send_buf *msg;
2002 unsigned long flags;
2003 int ret;
2004
2005 if (private_data && private_data_len > IB_CM_DREQ_PRIVATE_DATA_SIZE)
2006 return -EINVAL;
2007
2008 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2009 spin_lock_irqsave(&cm_id_priv->lock, flags);
2010 if (cm_id->state != IB_CM_ESTABLISHED) {
2011 ret = -EINVAL;
2012 goto out;
2013 }
2014
2015 if (cm_id->lap_state == IB_CM_LAP_SENT ||
2016 cm_id->lap_state == IB_CM_MRA_LAP_RCVD)
2017 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2018
2019 ret = cm_alloc_msg(cm_id_priv, &msg);
2020 if (ret) {
2021 cm_enter_timewait(cm_id_priv);
2022 goto out;
2023 }
2024
2025 cm_format_dreq((struct cm_dreq_msg *) msg->mad, cm_id_priv,
2026 private_data, private_data_len);
2027 msg->timeout_ms = cm_id_priv->timeout_ms;
2028 msg->context[1] = (void *) (unsigned long) IB_CM_DREQ_SENT;
2029
2030 ret = ib_post_send_mad(msg, NULL);
2031 if (ret) {
2032 cm_enter_timewait(cm_id_priv);
2033 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2034 cm_free_msg(msg);
2035 return ret;
2036 }
2037
2038 cm_id->state = IB_CM_DREQ_SENT;
2039 cm_id_priv->msg = msg;
2040 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2041 return ret;
2042 }
2043 EXPORT_SYMBOL(ib_send_cm_dreq);
2044
cm_format_drep(struct cm_drep_msg * drep_msg,struct cm_id_private * cm_id_priv,const void * private_data,u8 private_data_len)2045 static void cm_format_drep(struct cm_drep_msg *drep_msg,
2046 struct cm_id_private *cm_id_priv,
2047 const void *private_data,
2048 u8 private_data_len)
2049 {
2050 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, cm_id_priv->tid);
2051 drep_msg->local_comm_id = cm_id_priv->id.local_id;
2052 drep_msg->remote_comm_id = cm_id_priv->id.remote_id;
2053
2054 if (private_data && private_data_len)
2055 memcpy(drep_msg->private_data, private_data, private_data_len);
2056 }
2057
ib_send_cm_drep(struct ib_cm_id * cm_id,const void * private_data,u8 private_data_len)2058 int ib_send_cm_drep(struct ib_cm_id *cm_id,
2059 const void *private_data,
2060 u8 private_data_len)
2061 {
2062 struct cm_id_private *cm_id_priv;
2063 struct ib_mad_send_buf *msg;
2064 unsigned long flags;
2065 void *data;
2066 int ret;
2067
2068 if (private_data && private_data_len > IB_CM_DREP_PRIVATE_DATA_SIZE)
2069 return -EINVAL;
2070
2071 data = cm_copy_private_data(private_data, private_data_len);
2072 if (IS_ERR(data))
2073 return PTR_ERR(data);
2074
2075 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2076 spin_lock_irqsave(&cm_id_priv->lock, flags);
2077 if (cm_id->state != IB_CM_DREQ_RCVD) {
2078 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2079 kfree(data);
2080 return -EINVAL;
2081 }
2082
2083 cm_set_private_data(cm_id_priv, data, private_data_len);
2084 cm_enter_timewait(cm_id_priv);
2085
2086 ret = cm_alloc_msg(cm_id_priv, &msg);
2087 if (ret)
2088 goto out;
2089
2090 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2091 private_data, private_data_len);
2092
2093 ret = ib_post_send_mad(msg, NULL);
2094 if (ret) {
2095 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2096 cm_free_msg(msg);
2097 return ret;
2098 }
2099
2100 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2101 return ret;
2102 }
2103 EXPORT_SYMBOL(ib_send_cm_drep);
2104
cm_issue_drep(struct cm_port * port,struct ib_mad_recv_wc * mad_recv_wc)2105 static int cm_issue_drep(struct cm_port *port,
2106 struct ib_mad_recv_wc *mad_recv_wc)
2107 {
2108 struct ib_mad_send_buf *msg = NULL;
2109 struct cm_dreq_msg *dreq_msg;
2110 struct cm_drep_msg *drep_msg;
2111 int ret;
2112
2113 ret = cm_alloc_response_msg(port, mad_recv_wc, &msg);
2114 if (ret)
2115 return ret;
2116
2117 dreq_msg = (struct cm_dreq_msg *) mad_recv_wc->recv_buf.mad;
2118 drep_msg = (struct cm_drep_msg *) msg->mad;
2119
2120 cm_format_mad_hdr(&drep_msg->hdr, CM_DREP_ATTR_ID, dreq_msg->hdr.tid);
2121 drep_msg->remote_comm_id = dreq_msg->local_comm_id;
2122 drep_msg->local_comm_id = dreq_msg->remote_comm_id;
2123
2124 ret = ib_post_send_mad(msg, NULL);
2125 if (ret)
2126 cm_free_msg(msg);
2127
2128 return ret;
2129 }
2130
cm_dreq_handler(struct cm_work * work)2131 static int cm_dreq_handler(struct cm_work *work)
2132 {
2133 struct cm_id_private *cm_id_priv;
2134 struct cm_dreq_msg *dreq_msg;
2135 struct ib_mad_send_buf *msg = NULL;
2136 int ret;
2137
2138 dreq_msg = (struct cm_dreq_msg *)work->mad_recv_wc->recv_buf.mad;
2139 cm_id_priv = cm_acquire_id(dreq_msg->remote_comm_id,
2140 dreq_msg->local_comm_id);
2141 if (!cm_id_priv) {
2142 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2143 counter[CM_DREQ_COUNTER]);
2144 cm_issue_drep(work->port, work->mad_recv_wc);
2145 return -EINVAL;
2146 }
2147
2148 work->cm_event.private_data = &dreq_msg->private_data;
2149
2150 spin_lock_irq(&cm_id_priv->lock);
2151 if (cm_id_priv->local_qpn != cm_dreq_get_remote_qpn(dreq_msg))
2152 goto unlock;
2153
2154 switch (cm_id_priv->id.state) {
2155 case IB_CM_REP_SENT:
2156 case IB_CM_DREQ_SENT:
2157 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2158 break;
2159 case IB_CM_ESTABLISHED:
2160 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT ||
2161 cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2162 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2163 break;
2164 case IB_CM_MRA_REP_RCVD:
2165 break;
2166 case IB_CM_TIMEWAIT:
2167 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2168 counter[CM_DREQ_COUNTER]);
2169 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2170 goto unlock;
2171
2172 cm_format_drep((struct cm_drep_msg *) msg->mad, cm_id_priv,
2173 cm_id_priv->private_data,
2174 cm_id_priv->private_data_len);
2175 spin_unlock_irq(&cm_id_priv->lock);
2176
2177 if (ib_post_send_mad(msg, NULL))
2178 cm_free_msg(msg);
2179 goto deref;
2180 case IB_CM_DREQ_RCVD:
2181 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2182 counter[CM_DREQ_COUNTER]);
2183 goto unlock;
2184 default:
2185 goto unlock;
2186 }
2187 cm_id_priv->id.state = IB_CM_DREQ_RCVD;
2188 cm_id_priv->tid = dreq_msg->hdr.tid;
2189 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2190 if (!ret)
2191 list_add_tail(&work->list, &cm_id_priv->work_list);
2192 spin_unlock_irq(&cm_id_priv->lock);
2193
2194 if (ret)
2195 cm_process_work(cm_id_priv, work);
2196 else
2197 cm_deref_id(cm_id_priv);
2198 return 0;
2199
2200 unlock: spin_unlock_irq(&cm_id_priv->lock);
2201 deref: cm_deref_id(cm_id_priv);
2202 return -EINVAL;
2203 }
2204
cm_drep_handler(struct cm_work * work)2205 static int cm_drep_handler(struct cm_work *work)
2206 {
2207 struct cm_id_private *cm_id_priv;
2208 struct cm_drep_msg *drep_msg;
2209 int ret;
2210
2211 drep_msg = (struct cm_drep_msg *)work->mad_recv_wc->recv_buf.mad;
2212 cm_id_priv = cm_acquire_id(drep_msg->remote_comm_id,
2213 drep_msg->local_comm_id);
2214 if (!cm_id_priv)
2215 return -EINVAL;
2216
2217 work->cm_event.private_data = &drep_msg->private_data;
2218
2219 spin_lock_irq(&cm_id_priv->lock);
2220 if (cm_id_priv->id.state != IB_CM_DREQ_SENT &&
2221 cm_id_priv->id.state != IB_CM_DREQ_RCVD) {
2222 spin_unlock_irq(&cm_id_priv->lock);
2223 goto out;
2224 }
2225 cm_enter_timewait(cm_id_priv);
2226
2227 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2228 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2229 if (!ret)
2230 list_add_tail(&work->list, &cm_id_priv->work_list);
2231 spin_unlock_irq(&cm_id_priv->lock);
2232
2233 if (ret)
2234 cm_process_work(cm_id_priv, work);
2235 else
2236 cm_deref_id(cm_id_priv);
2237 return 0;
2238 out:
2239 cm_deref_id(cm_id_priv);
2240 return -EINVAL;
2241 }
2242
ib_send_cm_rej(struct ib_cm_id * cm_id,enum ib_cm_rej_reason reason,void * ari,u8 ari_length,const void * private_data,u8 private_data_len)2243 int ib_send_cm_rej(struct ib_cm_id *cm_id,
2244 enum ib_cm_rej_reason reason,
2245 void *ari,
2246 u8 ari_length,
2247 const void *private_data,
2248 u8 private_data_len)
2249 {
2250 struct cm_id_private *cm_id_priv;
2251 struct ib_mad_send_buf *msg;
2252 unsigned long flags;
2253 int ret;
2254
2255 if ((private_data && private_data_len > IB_CM_REJ_PRIVATE_DATA_SIZE) ||
2256 (ari && ari_length > IB_CM_REJ_ARI_LENGTH))
2257 return -EINVAL;
2258
2259 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2260
2261 spin_lock_irqsave(&cm_id_priv->lock, flags);
2262 switch (cm_id->state) {
2263 case IB_CM_REQ_SENT:
2264 case IB_CM_MRA_REQ_RCVD:
2265 case IB_CM_REQ_RCVD:
2266 case IB_CM_MRA_REQ_SENT:
2267 case IB_CM_REP_RCVD:
2268 case IB_CM_MRA_REP_SENT:
2269 ret = cm_alloc_msg(cm_id_priv, &msg);
2270 if (!ret)
2271 cm_format_rej((struct cm_rej_msg *) msg->mad,
2272 cm_id_priv, reason, ari, ari_length,
2273 private_data, private_data_len);
2274
2275 cm_reset_to_idle(cm_id_priv);
2276 break;
2277 case IB_CM_REP_SENT:
2278 case IB_CM_MRA_REP_RCVD:
2279 ret = cm_alloc_msg(cm_id_priv, &msg);
2280 if (!ret)
2281 cm_format_rej((struct cm_rej_msg *) msg->mad,
2282 cm_id_priv, reason, ari, ari_length,
2283 private_data, private_data_len);
2284
2285 cm_enter_timewait(cm_id_priv);
2286 break;
2287 default:
2288 ret = -EINVAL;
2289 goto out;
2290 }
2291
2292 if (ret)
2293 goto out;
2294
2295 ret = ib_post_send_mad(msg, NULL);
2296 if (ret)
2297 cm_free_msg(msg);
2298
2299 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2300 return ret;
2301 }
2302 EXPORT_SYMBOL(ib_send_cm_rej);
2303
cm_format_rej_event(struct cm_work * work)2304 static void cm_format_rej_event(struct cm_work *work)
2305 {
2306 struct cm_rej_msg *rej_msg;
2307 struct ib_cm_rej_event_param *param;
2308
2309 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2310 param = &work->cm_event.param.rej_rcvd;
2311 param->ari = rej_msg->ari;
2312 param->ari_length = cm_rej_get_reject_info_len(rej_msg);
2313 param->reason = __be16_to_cpu(rej_msg->reason);
2314 work->cm_event.private_data = &rej_msg->private_data;
2315 }
2316
cm_acquire_rejected_id(struct cm_rej_msg * rej_msg)2317 static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg)
2318 {
2319 struct cm_timewait_info *timewait_info;
2320 struct cm_id_private *cm_id_priv;
2321 __be32 remote_id;
2322
2323 remote_id = rej_msg->local_comm_id;
2324
2325 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_TIMEOUT) {
2326 spin_lock_irq(&cm.lock);
2327 timewait_info = cm_find_remote_id( *((__be64 *) rej_msg->ari),
2328 remote_id);
2329 if (!timewait_info) {
2330 spin_unlock_irq(&cm.lock);
2331 return NULL;
2332 }
2333 cm_id_priv = idr_find(&cm.local_id_table, (__force int)
2334 (timewait_info->work.local_id ^
2335 cm.random_id_operand));
2336 if (cm_id_priv) {
2337 if (cm_id_priv->id.remote_id == remote_id)
2338 atomic_inc(&cm_id_priv->refcount);
2339 else
2340 cm_id_priv = NULL;
2341 }
2342 spin_unlock_irq(&cm.lock);
2343 } else if (cm_rej_get_msg_rejected(rej_msg) == CM_MSG_RESPONSE_REQ)
2344 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, 0);
2345 else
2346 cm_id_priv = cm_acquire_id(rej_msg->remote_comm_id, remote_id);
2347
2348 return cm_id_priv;
2349 }
2350
cm_rej_handler(struct cm_work * work)2351 static int cm_rej_handler(struct cm_work *work)
2352 {
2353 struct cm_id_private *cm_id_priv;
2354 struct cm_rej_msg *rej_msg;
2355 int ret;
2356
2357 rej_msg = (struct cm_rej_msg *)work->mad_recv_wc->recv_buf.mad;
2358 cm_id_priv = cm_acquire_rejected_id(rej_msg);
2359 if (!cm_id_priv)
2360 return -EINVAL;
2361
2362 cm_format_rej_event(work);
2363
2364 spin_lock_irq(&cm_id_priv->lock);
2365 switch (cm_id_priv->id.state) {
2366 case IB_CM_REQ_SENT:
2367 case IB_CM_MRA_REQ_RCVD:
2368 case IB_CM_REP_SENT:
2369 case IB_CM_MRA_REP_RCVD:
2370 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2371 /* fall through */
2372 case IB_CM_REQ_RCVD:
2373 case IB_CM_MRA_REQ_SENT:
2374 if (__be16_to_cpu(rej_msg->reason) == IB_CM_REJ_STALE_CONN)
2375 cm_enter_timewait(cm_id_priv);
2376 else
2377 cm_reset_to_idle(cm_id_priv);
2378 break;
2379 case IB_CM_DREQ_SENT:
2380 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2381 /* fall through */
2382 case IB_CM_REP_RCVD:
2383 case IB_CM_MRA_REP_SENT:
2384 cm_enter_timewait(cm_id_priv);
2385 break;
2386 case IB_CM_ESTABLISHED:
2387 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT ||
2388 cm_id_priv->id.lap_state == IB_CM_LAP_SENT) {
2389 if (cm_id_priv->id.lap_state == IB_CM_LAP_SENT)
2390 ib_cancel_mad(cm_id_priv->av.port->mad_agent,
2391 cm_id_priv->msg);
2392 cm_enter_timewait(cm_id_priv);
2393 break;
2394 }
2395 /* fall through */
2396 default:
2397 spin_unlock_irq(&cm_id_priv->lock);
2398 ret = -EINVAL;
2399 goto out;
2400 }
2401
2402 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2403 if (!ret)
2404 list_add_tail(&work->list, &cm_id_priv->work_list);
2405 spin_unlock_irq(&cm_id_priv->lock);
2406
2407 if (ret)
2408 cm_process_work(cm_id_priv, work);
2409 else
2410 cm_deref_id(cm_id_priv);
2411 return 0;
2412 out:
2413 cm_deref_id(cm_id_priv);
2414 return -EINVAL;
2415 }
2416
ib_send_cm_mra(struct ib_cm_id * cm_id,u8 service_timeout,const void * private_data,u8 private_data_len)2417 int ib_send_cm_mra(struct ib_cm_id *cm_id,
2418 u8 service_timeout,
2419 const void *private_data,
2420 u8 private_data_len)
2421 {
2422 struct cm_id_private *cm_id_priv;
2423 struct ib_mad_send_buf *msg;
2424 enum ib_cm_state cm_state;
2425 enum ib_cm_lap_state lap_state;
2426 enum cm_msg_response msg_response;
2427 void *data;
2428 unsigned long flags;
2429 int ret;
2430
2431 if (private_data && private_data_len > IB_CM_MRA_PRIVATE_DATA_SIZE)
2432 return -EINVAL;
2433
2434 data = cm_copy_private_data(private_data, private_data_len);
2435 if (IS_ERR(data))
2436 return PTR_ERR(data);
2437
2438 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2439
2440 spin_lock_irqsave(&cm_id_priv->lock, flags);
2441 switch(cm_id_priv->id.state) {
2442 case IB_CM_REQ_RCVD:
2443 cm_state = IB_CM_MRA_REQ_SENT;
2444 lap_state = cm_id->lap_state;
2445 msg_response = CM_MSG_RESPONSE_REQ;
2446 break;
2447 case IB_CM_REP_RCVD:
2448 cm_state = IB_CM_MRA_REP_SENT;
2449 lap_state = cm_id->lap_state;
2450 msg_response = CM_MSG_RESPONSE_REP;
2451 break;
2452 case IB_CM_ESTABLISHED:
2453 if (cm_id->lap_state == IB_CM_LAP_RCVD) {
2454 cm_state = cm_id->state;
2455 lap_state = IB_CM_MRA_LAP_SENT;
2456 msg_response = CM_MSG_RESPONSE_OTHER;
2457 break;
2458 }
2459 default:
2460 ret = -EINVAL;
2461 goto error1;
2462 }
2463
2464 if (!(service_timeout & IB_CM_MRA_FLAG_DELAY)) {
2465 ret = cm_alloc_msg(cm_id_priv, &msg);
2466 if (ret)
2467 goto error1;
2468
2469 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2470 msg_response, service_timeout,
2471 private_data, private_data_len);
2472 ret = ib_post_send_mad(msg, NULL);
2473 if (ret)
2474 goto error2;
2475 }
2476
2477 cm_id->state = cm_state;
2478 cm_id->lap_state = lap_state;
2479 cm_id_priv->service_timeout = service_timeout;
2480 cm_set_private_data(cm_id_priv, data, private_data_len);
2481 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2482 return 0;
2483
2484 error1: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2485 kfree(data);
2486 return ret;
2487
2488 error2: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2489 kfree(data);
2490 cm_free_msg(msg);
2491 return ret;
2492 }
2493 EXPORT_SYMBOL(ib_send_cm_mra);
2494
cm_acquire_mraed_id(struct cm_mra_msg * mra_msg)2495 static struct cm_id_private * cm_acquire_mraed_id(struct cm_mra_msg *mra_msg)
2496 {
2497 switch (cm_mra_get_msg_mraed(mra_msg)) {
2498 case CM_MSG_RESPONSE_REQ:
2499 return cm_acquire_id(mra_msg->remote_comm_id, 0);
2500 case CM_MSG_RESPONSE_REP:
2501 case CM_MSG_RESPONSE_OTHER:
2502 return cm_acquire_id(mra_msg->remote_comm_id,
2503 mra_msg->local_comm_id);
2504 default:
2505 return NULL;
2506 }
2507 }
2508
cm_mra_handler(struct cm_work * work)2509 static int cm_mra_handler(struct cm_work *work)
2510 {
2511 struct cm_id_private *cm_id_priv;
2512 struct cm_mra_msg *mra_msg;
2513 int timeout, ret;
2514
2515 mra_msg = (struct cm_mra_msg *)work->mad_recv_wc->recv_buf.mad;
2516 cm_id_priv = cm_acquire_mraed_id(mra_msg);
2517 if (!cm_id_priv)
2518 return -EINVAL;
2519
2520 work->cm_event.private_data = &mra_msg->private_data;
2521 work->cm_event.param.mra_rcvd.service_timeout =
2522 cm_mra_get_service_timeout(mra_msg);
2523 timeout = cm_convert_to_ms(cm_mra_get_service_timeout(mra_msg)) +
2524 cm_convert_to_ms(cm_id_priv->av.timeout);
2525
2526 spin_lock_irq(&cm_id_priv->lock);
2527 switch (cm_id_priv->id.state) {
2528 case IB_CM_REQ_SENT:
2529 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REQ ||
2530 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2531 cm_id_priv->msg, timeout))
2532 goto out;
2533 cm_id_priv->id.state = IB_CM_MRA_REQ_RCVD;
2534 break;
2535 case IB_CM_REP_SENT:
2536 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_REP ||
2537 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2538 cm_id_priv->msg, timeout))
2539 goto out;
2540 cm_id_priv->id.state = IB_CM_MRA_REP_RCVD;
2541 break;
2542 case IB_CM_ESTABLISHED:
2543 if (cm_mra_get_msg_mraed(mra_msg) != CM_MSG_RESPONSE_OTHER ||
2544 cm_id_priv->id.lap_state != IB_CM_LAP_SENT ||
2545 ib_modify_mad(cm_id_priv->av.port->mad_agent,
2546 cm_id_priv->msg, timeout)) {
2547 if (cm_id_priv->id.lap_state == IB_CM_MRA_LAP_RCVD)
2548 atomic_long_inc(&work->port->
2549 counter_group[CM_RECV_DUPLICATES].
2550 counter[CM_MRA_COUNTER]);
2551 goto out;
2552 }
2553 cm_id_priv->id.lap_state = IB_CM_MRA_LAP_RCVD;
2554 break;
2555 case IB_CM_MRA_REQ_RCVD:
2556 case IB_CM_MRA_REP_RCVD:
2557 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2558 counter[CM_MRA_COUNTER]);
2559 /* fall through */
2560 default:
2561 goto out;
2562 }
2563
2564 cm_id_priv->msg->context[1] = (void *) (unsigned long)
2565 cm_id_priv->id.state;
2566 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2567 if (!ret)
2568 list_add_tail(&work->list, &cm_id_priv->work_list);
2569 spin_unlock_irq(&cm_id_priv->lock);
2570
2571 if (ret)
2572 cm_process_work(cm_id_priv, work);
2573 else
2574 cm_deref_id(cm_id_priv);
2575 return 0;
2576 out:
2577 spin_unlock_irq(&cm_id_priv->lock);
2578 cm_deref_id(cm_id_priv);
2579 return -EINVAL;
2580 }
2581
cm_format_lap(struct cm_lap_msg * lap_msg,struct cm_id_private * cm_id_priv,struct ib_sa_path_rec * alternate_path,const void * private_data,u8 private_data_len)2582 static void cm_format_lap(struct cm_lap_msg *lap_msg,
2583 struct cm_id_private *cm_id_priv,
2584 struct ib_sa_path_rec *alternate_path,
2585 const void *private_data,
2586 u8 private_data_len)
2587 {
2588 cm_format_mad_hdr(&lap_msg->hdr, CM_LAP_ATTR_ID,
2589 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_LAP));
2590 lap_msg->local_comm_id = cm_id_priv->id.local_id;
2591 lap_msg->remote_comm_id = cm_id_priv->id.remote_id;
2592 cm_lap_set_remote_qpn(lap_msg, cm_id_priv->remote_qpn);
2593 /* todo: need remote CM response timeout */
2594 cm_lap_set_remote_resp_timeout(lap_msg, 0x1F);
2595 lap_msg->alt_local_lid = alternate_path->slid;
2596 lap_msg->alt_remote_lid = alternate_path->dlid;
2597 lap_msg->alt_local_gid = alternate_path->sgid;
2598 lap_msg->alt_remote_gid = alternate_path->dgid;
2599 cm_lap_set_flow_label(lap_msg, alternate_path->flow_label);
2600 cm_lap_set_traffic_class(lap_msg, alternate_path->traffic_class);
2601 lap_msg->alt_hop_limit = alternate_path->hop_limit;
2602 cm_lap_set_packet_rate(lap_msg, alternate_path->rate);
2603 cm_lap_set_sl(lap_msg, alternate_path->sl);
2604 cm_lap_set_subnet_local(lap_msg, 1); /* local only... */
2605 cm_lap_set_local_ack_timeout(lap_msg,
2606 cm_ack_timeout(cm_id_priv->av.port->cm_dev->ack_delay,
2607 alternate_path->packet_life_time));
2608
2609 if (private_data && private_data_len)
2610 memcpy(lap_msg->private_data, private_data, private_data_len);
2611 }
2612
ib_send_cm_lap(struct ib_cm_id * cm_id,struct ib_sa_path_rec * alternate_path,const void * private_data,u8 private_data_len)2613 int ib_send_cm_lap(struct ib_cm_id *cm_id,
2614 struct ib_sa_path_rec *alternate_path,
2615 const void *private_data,
2616 u8 private_data_len)
2617 {
2618 struct cm_id_private *cm_id_priv;
2619 struct ib_mad_send_buf *msg;
2620 unsigned long flags;
2621 int ret;
2622
2623 if (private_data && private_data_len > IB_CM_LAP_PRIVATE_DATA_SIZE)
2624 return -EINVAL;
2625
2626 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2627 spin_lock_irqsave(&cm_id_priv->lock, flags);
2628 if (cm_id->state != IB_CM_ESTABLISHED ||
2629 (cm_id->lap_state != IB_CM_LAP_UNINIT &&
2630 cm_id->lap_state != IB_CM_LAP_IDLE)) {
2631 ret = -EINVAL;
2632 goto out;
2633 }
2634
2635 ret = cm_init_av_by_path(alternate_path, &cm_id_priv->alt_av);
2636 if (ret)
2637 goto out;
2638 cm_id_priv->alt_av.timeout =
2639 cm_ack_timeout(cm_id_priv->target_ack_delay,
2640 cm_id_priv->alt_av.timeout - 1);
2641
2642 ret = cm_alloc_msg(cm_id_priv, &msg);
2643 if (ret)
2644 goto out;
2645
2646 cm_format_lap((struct cm_lap_msg *) msg->mad, cm_id_priv,
2647 alternate_path, private_data, private_data_len);
2648 msg->timeout_ms = cm_id_priv->timeout_ms;
2649 msg->context[1] = (void *) (unsigned long) IB_CM_ESTABLISHED;
2650
2651 ret = ib_post_send_mad(msg, NULL);
2652 if (ret) {
2653 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2654 cm_free_msg(msg);
2655 return ret;
2656 }
2657
2658 cm_id->lap_state = IB_CM_LAP_SENT;
2659 cm_id_priv->msg = msg;
2660
2661 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2662 return ret;
2663 }
2664 EXPORT_SYMBOL(ib_send_cm_lap);
2665
cm_format_path_from_lap(struct cm_id_private * cm_id_priv,struct ib_sa_path_rec * path,struct cm_lap_msg * lap_msg)2666 static void cm_format_path_from_lap(struct cm_id_private *cm_id_priv,
2667 struct ib_sa_path_rec *path,
2668 struct cm_lap_msg *lap_msg)
2669 {
2670 memset(path, 0, sizeof *path);
2671 path->dgid = lap_msg->alt_local_gid;
2672 path->sgid = lap_msg->alt_remote_gid;
2673 path->dlid = lap_msg->alt_local_lid;
2674 path->slid = lap_msg->alt_remote_lid;
2675 path->flow_label = cm_lap_get_flow_label(lap_msg);
2676 path->hop_limit = lap_msg->alt_hop_limit;
2677 path->traffic_class = cm_lap_get_traffic_class(lap_msg);
2678 path->reversible = 1;
2679 path->pkey = cm_id_priv->pkey;
2680 path->sl = cm_lap_get_sl(lap_msg);
2681 path->mtu_selector = IB_SA_EQ;
2682 path->mtu = cm_id_priv->path_mtu;
2683 path->rate_selector = IB_SA_EQ;
2684 path->rate = cm_lap_get_packet_rate(lap_msg);
2685 path->packet_life_time_selector = IB_SA_EQ;
2686 path->packet_life_time = cm_lap_get_local_ack_timeout(lap_msg);
2687 path->packet_life_time -= (path->packet_life_time > 0);
2688 }
2689
cm_lap_handler(struct cm_work * work)2690 static int cm_lap_handler(struct cm_work *work)
2691 {
2692 struct cm_id_private *cm_id_priv;
2693 struct cm_lap_msg *lap_msg;
2694 struct ib_cm_lap_event_param *param;
2695 struct ib_mad_send_buf *msg = NULL;
2696 int ret;
2697
2698 /* todo: verify LAP request and send reject APR if invalid. */
2699 lap_msg = (struct cm_lap_msg *)work->mad_recv_wc->recv_buf.mad;
2700 cm_id_priv = cm_acquire_id(lap_msg->remote_comm_id,
2701 lap_msg->local_comm_id);
2702 if (!cm_id_priv)
2703 return -EINVAL;
2704
2705 param = &work->cm_event.param.lap_rcvd;
2706 param->alternate_path = &work->path[0];
2707 cm_format_path_from_lap(cm_id_priv, param->alternate_path, lap_msg);
2708 work->cm_event.private_data = &lap_msg->private_data;
2709
2710 spin_lock_irq(&cm_id_priv->lock);
2711 if (cm_id_priv->id.state != IB_CM_ESTABLISHED)
2712 goto unlock;
2713
2714 switch (cm_id_priv->id.lap_state) {
2715 case IB_CM_LAP_UNINIT:
2716 case IB_CM_LAP_IDLE:
2717 break;
2718 case IB_CM_MRA_LAP_SENT:
2719 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2720 counter[CM_LAP_COUNTER]);
2721 if (cm_alloc_response_msg(work->port, work->mad_recv_wc, &msg))
2722 goto unlock;
2723
2724 cm_format_mra((struct cm_mra_msg *) msg->mad, cm_id_priv,
2725 CM_MSG_RESPONSE_OTHER,
2726 cm_id_priv->service_timeout,
2727 cm_id_priv->private_data,
2728 cm_id_priv->private_data_len);
2729 spin_unlock_irq(&cm_id_priv->lock);
2730
2731 if (ib_post_send_mad(msg, NULL))
2732 cm_free_msg(msg);
2733 goto deref;
2734 case IB_CM_LAP_RCVD:
2735 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
2736 counter[CM_LAP_COUNTER]);
2737 goto unlock;
2738 default:
2739 goto unlock;
2740 }
2741
2742 cm_id_priv->id.lap_state = IB_CM_LAP_RCVD;
2743 cm_id_priv->tid = lap_msg->hdr.tid;
2744 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
2745 work->mad_recv_wc->recv_buf.grh,
2746 &cm_id_priv->av);
2747 cm_init_av_by_path(param->alternate_path, &cm_id_priv->alt_av);
2748 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2749 if (!ret)
2750 list_add_tail(&work->list, &cm_id_priv->work_list);
2751 spin_unlock_irq(&cm_id_priv->lock);
2752
2753 if (ret)
2754 cm_process_work(cm_id_priv, work);
2755 else
2756 cm_deref_id(cm_id_priv);
2757 return 0;
2758
2759 unlock: spin_unlock_irq(&cm_id_priv->lock);
2760 deref: cm_deref_id(cm_id_priv);
2761 return -EINVAL;
2762 }
2763
cm_format_apr(struct cm_apr_msg * apr_msg,struct cm_id_private * cm_id_priv,enum ib_cm_apr_status status,void * info,u8 info_length,const void * private_data,u8 private_data_len)2764 static void cm_format_apr(struct cm_apr_msg *apr_msg,
2765 struct cm_id_private *cm_id_priv,
2766 enum ib_cm_apr_status status,
2767 void *info,
2768 u8 info_length,
2769 const void *private_data,
2770 u8 private_data_len)
2771 {
2772 cm_format_mad_hdr(&apr_msg->hdr, CM_APR_ATTR_ID, cm_id_priv->tid);
2773 apr_msg->local_comm_id = cm_id_priv->id.local_id;
2774 apr_msg->remote_comm_id = cm_id_priv->id.remote_id;
2775 apr_msg->ap_status = (u8) status;
2776
2777 if (info && info_length) {
2778 apr_msg->info_length = info_length;
2779 memcpy(apr_msg->info, info, info_length);
2780 }
2781
2782 if (private_data && private_data_len)
2783 memcpy(apr_msg->private_data, private_data, private_data_len);
2784 }
2785
ib_send_cm_apr(struct ib_cm_id * cm_id,enum ib_cm_apr_status status,void * info,u8 info_length,const void * private_data,u8 private_data_len)2786 int ib_send_cm_apr(struct ib_cm_id *cm_id,
2787 enum ib_cm_apr_status status,
2788 void *info,
2789 u8 info_length,
2790 const void *private_data,
2791 u8 private_data_len)
2792 {
2793 struct cm_id_private *cm_id_priv;
2794 struct ib_mad_send_buf *msg;
2795 unsigned long flags;
2796 int ret;
2797
2798 if ((private_data && private_data_len > IB_CM_APR_PRIVATE_DATA_SIZE) ||
2799 (info && info_length > IB_CM_APR_INFO_LENGTH))
2800 return -EINVAL;
2801
2802 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2803 spin_lock_irqsave(&cm_id_priv->lock, flags);
2804 if (cm_id->state != IB_CM_ESTABLISHED ||
2805 (cm_id->lap_state != IB_CM_LAP_RCVD &&
2806 cm_id->lap_state != IB_CM_MRA_LAP_SENT)) {
2807 ret = -EINVAL;
2808 goto out;
2809 }
2810
2811 ret = cm_alloc_msg(cm_id_priv, &msg);
2812 if (ret)
2813 goto out;
2814
2815 cm_format_apr((struct cm_apr_msg *) msg->mad, cm_id_priv, status,
2816 info, info_length, private_data, private_data_len);
2817 ret = ib_post_send_mad(msg, NULL);
2818 if (ret) {
2819 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2820 cm_free_msg(msg);
2821 return ret;
2822 }
2823
2824 cm_id->lap_state = IB_CM_LAP_IDLE;
2825 out: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2826 return ret;
2827 }
2828 EXPORT_SYMBOL(ib_send_cm_apr);
2829
cm_apr_handler(struct cm_work * work)2830 static int cm_apr_handler(struct cm_work *work)
2831 {
2832 struct cm_id_private *cm_id_priv;
2833 struct cm_apr_msg *apr_msg;
2834 int ret;
2835
2836 apr_msg = (struct cm_apr_msg *)work->mad_recv_wc->recv_buf.mad;
2837 cm_id_priv = cm_acquire_id(apr_msg->remote_comm_id,
2838 apr_msg->local_comm_id);
2839 if (!cm_id_priv)
2840 return -EINVAL; /* Unmatched reply. */
2841
2842 work->cm_event.param.apr_rcvd.ap_status = apr_msg->ap_status;
2843 work->cm_event.param.apr_rcvd.apr_info = &apr_msg->info;
2844 work->cm_event.param.apr_rcvd.info_len = apr_msg->info_length;
2845 work->cm_event.private_data = &apr_msg->private_data;
2846
2847 spin_lock_irq(&cm_id_priv->lock);
2848 if (cm_id_priv->id.state != IB_CM_ESTABLISHED ||
2849 (cm_id_priv->id.lap_state != IB_CM_LAP_SENT &&
2850 cm_id_priv->id.lap_state != IB_CM_MRA_LAP_RCVD)) {
2851 spin_unlock_irq(&cm_id_priv->lock);
2852 goto out;
2853 }
2854 cm_id_priv->id.lap_state = IB_CM_LAP_IDLE;
2855 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
2856 cm_id_priv->msg = NULL;
2857
2858 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2859 if (!ret)
2860 list_add_tail(&work->list, &cm_id_priv->work_list);
2861 spin_unlock_irq(&cm_id_priv->lock);
2862
2863 if (ret)
2864 cm_process_work(cm_id_priv, work);
2865 else
2866 cm_deref_id(cm_id_priv);
2867 return 0;
2868 out:
2869 cm_deref_id(cm_id_priv);
2870 return -EINVAL;
2871 }
2872
cm_timewait_handler(struct cm_work * work)2873 static int cm_timewait_handler(struct cm_work *work)
2874 {
2875 struct cm_timewait_info *timewait_info;
2876 struct cm_id_private *cm_id_priv;
2877 int ret;
2878
2879 timewait_info = (struct cm_timewait_info *)work;
2880 spin_lock_irq(&cm.lock);
2881 list_del(&timewait_info->list);
2882 spin_unlock_irq(&cm.lock);
2883
2884 cm_id_priv = cm_acquire_id(timewait_info->work.local_id,
2885 timewait_info->work.remote_id);
2886 if (!cm_id_priv)
2887 return -EINVAL;
2888
2889 spin_lock_irq(&cm_id_priv->lock);
2890 if (cm_id_priv->id.state != IB_CM_TIMEWAIT ||
2891 cm_id_priv->remote_qpn != timewait_info->remote_qpn) {
2892 spin_unlock_irq(&cm_id_priv->lock);
2893 goto out;
2894 }
2895 cm_id_priv->id.state = IB_CM_IDLE;
2896 ret = atomic_inc_and_test(&cm_id_priv->work_count);
2897 if (!ret)
2898 list_add_tail(&work->list, &cm_id_priv->work_list);
2899 spin_unlock_irq(&cm_id_priv->lock);
2900
2901 if (ret)
2902 cm_process_work(cm_id_priv, work);
2903 else
2904 cm_deref_id(cm_id_priv);
2905 return 0;
2906 out:
2907 cm_deref_id(cm_id_priv);
2908 return -EINVAL;
2909 }
2910
cm_format_sidr_req(struct cm_sidr_req_msg * sidr_req_msg,struct cm_id_private * cm_id_priv,struct ib_cm_sidr_req_param * param)2911 static void cm_format_sidr_req(struct cm_sidr_req_msg *sidr_req_msg,
2912 struct cm_id_private *cm_id_priv,
2913 struct ib_cm_sidr_req_param *param)
2914 {
2915 cm_format_mad_hdr(&sidr_req_msg->hdr, CM_SIDR_REQ_ATTR_ID,
2916 cm_form_tid(cm_id_priv, CM_MSG_SEQUENCE_SIDR));
2917 sidr_req_msg->request_id = cm_id_priv->id.local_id;
2918 sidr_req_msg->pkey = param->path->pkey;
2919 sidr_req_msg->service_id = param->service_id;
2920
2921 if (param->private_data && param->private_data_len)
2922 memcpy(sidr_req_msg->private_data, param->private_data,
2923 param->private_data_len);
2924 }
2925
ib_send_cm_sidr_req(struct ib_cm_id * cm_id,struct ib_cm_sidr_req_param * param)2926 int ib_send_cm_sidr_req(struct ib_cm_id *cm_id,
2927 struct ib_cm_sidr_req_param *param)
2928 {
2929 struct cm_id_private *cm_id_priv;
2930 struct ib_mad_send_buf *msg;
2931 unsigned long flags;
2932 int ret;
2933
2934 if (!param->path || (param->private_data &&
2935 param->private_data_len > IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE))
2936 return -EINVAL;
2937
2938 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
2939 ret = cm_init_av_by_path(param->path, &cm_id_priv->av);
2940 if (ret)
2941 goto out;
2942
2943 cm_id->service_id = param->service_id;
2944 cm_id->service_mask = ~cpu_to_be64(0);
2945 cm_id_priv->timeout_ms = param->timeout_ms;
2946 cm_id_priv->max_cm_retries = param->max_cm_retries;
2947 ret = cm_alloc_msg(cm_id_priv, &msg);
2948 if (ret)
2949 goto out;
2950
2951 cm_format_sidr_req((struct cm_sidr_req_msg *) msg->mad, cm_id_priv,
2952 param);
2953 msg->timeout_ms = cm_id_priv->timeout_ms;
2954 msg->context[1] = (void *) (unsigned long) IB_CM_SIDR_REQ_SENT;
2955
2956 spin_lock_irqsave(&cm_id_priv->lock, flags);
2957 if (cm_id->state == IB_CM_IDLE)
2958 ret = ib_post_send_mad(msg, NULL);
2959 else
2960 ret = -EINVAL;
2961
2962 if (ret) {
2963 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2964 cm_free_msg(msg);
2965 goto out;
2966 }
2967 cm_id->state = IB_CM_SIDR_REQ_SENT;
2968 cm_id_priv->msg = msg;
2969 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
2970 out:
2971 return ret;
2972 }
2973 EXPORT_SYMBOL(ib_send_cm_sidr_req);
2974
cm_format_sidr_req_event(struct cm_work * work,struct ib_cm_id * listen_id)2975 static void cm_format_sidr_req_event(struct cm_work *work,
2976 struct ib_cm_id *listen_id)
2977 {
2978 struct cm_sidr_req_msg *sidr_req_msg;
2979 struct ib_cm_sidr_req_event_param *param;
2980
2981 sidr_req_msg = (struct cm_sidr_req_msg *)
2982 work->mad_recv_wc->recv_buf.mad;
2983 param = &work->cm_event.param.sidr_req_rcvd;
2984 param->pkey = __be16_to_cpu(sidr_req_msg->pkey);
2985 param->listen_id = listen_id;
2986 param->port = work->port->port_num;
2987 work->cm_event.private_data = &sidr_req_msg->private_data;
2988 }
2989
cm_sidr_req_handler(struct cm_work * work)2990 static int cm_sidr_req_handler(struct cm_work *work)
2991 {
2992 struct ib_cm_id *cm_id;
2993 struct cm_id_private *cm_id_priv, *cur_cm_id_priv;
2994 struct cm_sidr_req_msg *sidr_req_msg;
2995 struct ib_wc *wc;
2996
2997 cm_id = ib_create_cm_id(work->port->cm_dev->ib_device, NULL, NULL);
2998 if (IS_ERR(cm_id))
2999 return PTR_ERR(cm_id);
3000 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3001
3002 /* Record SGID/SLID and request ID for lookup. */
3003 sidr_req_msg = (struct cm_sidr_req_msg *)
3004 work->mad_recv_wc->recv_buf.mad;
3005 wc = work->mad_recv_wc->wc;
3006 cm_id_priv->av.dgid.global.subnet_prefix = cpu_to_be64(wc->slid);
3007 cm_id_priv->av.dgid.global.interface_id = 0;
3008 cm_init_av_for_response(work->port, work->mad_recv_wc->wc,
3009 work->mad_recv_wc->recv_buf.grh,
3010 &cm_id_priv->av);
3011 cm_id_priv->id.remote_id = sidr_req_msg->request_id;
3012 cm_id_priv->tid = sidr_req_msg->hdr.tid;
3013 atomic_inc(&cm_id_priv->work_count);
3014
3015 spin_lock_irq(&cm.lock);
3016 cur_cm_id_priv = cm_insert_remote_sidr(cm_id_priv);
3017 if (cur_cm_id_priv) {
3018 spin_unlock_irq(&cm.lock);
3019 atomic_long_inc(&work->port->counter_group[CM_RECV_DUPLICATES].
3020 counter[CM_SIDR_REQ_COUNTER]);
3021 goto out; /* Duplicate message. */
3022 }
3023 cm_id_priv->id.state = IB_CM_SIDR_REQ_RCVD;
3024 cur_cm_id_priv = cm_find_listen(cm_id->device,
3025 sidr_req_msg->service_id,
3026 sidr_req_msg->private_data);
3027 if (!cur_cm_id_priv) {
3028 spin_unlock_irq(&cm.lock);
3029 cm_reject_sidr_req(cm_id_priv, IB_SIDR_UNSUPPORTED);
3030 goto out; /* No match. */
3031 }
3032 atomic_inc(&cur_cm_id_priv->refcount);
3033 atomic_inc(&cm_id_priv->refcount);
3034 spin_unlock_irq(&cm.lock);
3035
3036 cm_id_priv->id.cm_handler = cur_cm_id_priv->id.cm_handler;
3037 cm_id_priv->id.context = cur_cm_id_priv->id.context;
3038 cm_id_priv->id.service_id = sidr_req_msg->service_id;
3039 cm_id_priv->id.service_mask = ~cpu_to_be64(0);
3040
3041 cm_format_sidr_req_event(work, &cur_cm_id_priv->id);
3042 cm_process_work(cm_id_priv, work);
3043 cm_deref_id(cur_cm_id_priv);
3044 return 0;
3045 out:
3046 ib_destroy_cm_id(&cm_id_priv->id);
3047 return -EINVAL;
3048 }
3049
cm_format_sidr_rep(struct cm_sidr_rep_msg * sidr_rep_msg,struct cm_id_private * cm_id_priv,struct ib_cm_sidr_rep_param * param)3050 static void cm_format_sidr_rep(struct cm_sidr_rep_msg *sidr_rep_msg,
3051 struct cm_id_private *cm_id_priv,
3052 struct ib_cm_sidr_rep_param *param)
3053 {
3054 cm_format_mad_hdr(&sidr_rep_msg->hdr, CM_SIDR_REP_ATTR_ID,
3055 cm_id_priv->tid);
3056 sidr_rep_msg->request_id = cm_id_priv->id.remote_id;
3057 sidr_rep_msg->status = param->status;
3058 cm_sidr_rep_set_qpn(sidr_rep_msg, cpu_to_be32(param->qp_num));
3059 sidr_rep_msg->service_id = cm_id_priv->id.service_id;
3060 sidr_rep_msg->qkey = cpu_to_be32(param->qkey);
3061
3062 if (param->info && param->info_length)
3063 memcpy(sidr_rep_msg->info, param->info, param->info_length);
3064
3065 if (param->private_data && param->private_data_len)
3066 memcpy(sidr_rep_msg->private_data, param->private_data,
3067 param->private_data_len);
3068 }
3069
ib_send_cm_sidr_rep(struct ib_cm_id * cm_id,struct ib_cm_sidr_rep_param * param)3070 int ib_send_cm_sidr_rep(struct ib_cm_id *cm_id,
3071 struct ib_cm_sidr_rep_param *param)
3072 {
3073 struct cm_id_private *cm_id_priv;
3074 struct ib_mad_send_buf *msg;
3075 unsigned long flags;
3076 int ret;
3077
3078 if ((param->info && param->info_length > IB_CM_SIDR_REP_INFO_LENGTH) ||
3079 (param->private_data &&
3080 param->private_data_len > IB_CM_SIDR_REP_PRIVATE_DATA_SIZE))
3081 return -EINVAL;
3082
3083 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3084 spin_lock_irqsave(&cm_id_priv->lock, flags);
3085 if (cm_id->state != IB_CM_SIDR_REQ_RCVD) {
3086 ret = -EINVAL;
3087 goto error;
3088 }
3089
3090 ret = cm_alloc_msg(cm_id_priv, &msg);
3091 if (ret)
3092 goto error;
3093
3094 cm_format_sidr_rep((struct cm_sidr_rep_msg *) msg->mad, cm_id_priv,
3095 param);
3096 ret = ib_post_send_mad(msg, NULL);
3097 if (ret) {
3098 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3099 cm_free_msg(msg);
3100 return ret;
3101 }
3102 cm_id->state = IB_CM_IDLE;
3103 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3104
3105 spin_lock_irqsave(&cm.lock, flags);
3106 if (!RB_EMPTY_NODE(&cm_id_priv->sidr_id_node)) {
3107 rb_erase(&cm_id_priv->sidr_id_node, &cm.remote_sidr_table);
3108 RB_CLEAR_NODE(&cm_id_priv->sidr_id_node);
3109 }
3110 spin_unlock_irqrestore(&cm.lock, flags);
3111 return 0;
3112
3113 error: spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3114 return ret;
3115 }
3116 EXPORT_SYMBOL(ib_send_cm_sidr_rep);
3117
cm_format_sidr_rep_event(struct cm_work * work)3118 static void cm_format_sidr_rep_event(struct cm_work *work)
3119 {
3120 struct cm_sidr_rep_msg *sidr_rep_msg;
3121 struct ib_cm_sidr_rep_event_param *param;
3122
3123 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3124 work->mad_recv_wc->recv_buf.mad;
3125 param = &work->cm_event.param.sidr_rep_rcvd;
3126 param->status = sidr_rep_msg->status;
3127 param->qkey = be32_to_cpu(sidr_rep_msg->qkey);
3128 param->qpn = be32_to_cpu(cm_sidr_rep_get_qpn(sidr_rep_msg));
3129 param->info = &sidr_rep_msg->info;
3130 param->info_len = sidr_rep_msg->info_length;
3131 work->cm_event.private_data = &sidr_rep_msg->private_data;
3132 }
3133
cm_sidr_rep_handler(struct cm_work * work)3134 static int cm_sidr_rep_handler(struct cm_work *work)
3135 {
3136 struct cm_sidr_rep_msg *sidr_rep_msg;
3137 struct cm_id_private *cm_id_priv;
3138
3139 sidr_rep_msg = (struct cm_sidr_rep_msg *)
3140 work->mad_recv_wc->recv_buf.mad;
3141 cm_id_priv = cm_acquire_id(sidr_rep_msg->request_id, 0);
3142 if (!cm_id_priv)
3143 return -EINVAL; /* Unmatched reply. */
3144
3145 spin_lock_irq(&cm_id_priv->lock);
3146 if (cm_id_priv->id.state != IB_CM_SIDR_REQ_SENT) {
3147 spin_unlock_irq(&cm_id_priv->lock);
3148 goto out;
3149 }
3150 cm_id_priv->id.state = IB_CM_IDLE;
3151 ib_cancel_mad(cm_id_priv->av.port->mad_agent, cm_id_priv->msg);
3152 spin_unlock_irq(&cm_id_priv->lock);
3153
3154 cm_format_sidr_rep_event(work);
3155 cm_process_work(cm_id_priv, work);
3156 return 0;
3157 out:
3158 cm_deref_id(cm_id_priv);
3159 return -EINVAL;
3160 }
3161
cm_process_send_error(struct ib_mad_send_buf * msg,enum ib_wc_status wc_status)3162 static void cm_process_send_error(struct ib_mad_send_buf *msg,
3163 enum ib_wc_status wc_status)
3164 {
3165 struct cm_id_private *cm_id_priv;
3166 struct ib_cm_event cm_event;
3167 enum ib_cm_state state;
3168 int ret;
3169
3170 memset(&cm_event, 0, sizeof cm_event);
3171 cm_id_priv = msg->context[0];
3172
3173 /* Discard old sends or ones without a response. */
3174 spin_lock_irq(&cm_id_priv->lock);
3175 state = (enum ib_cm_state) (unsigned long) msg->context[1];
3176 if (msg != cm_id_priv->msg || state != cm_id_priv->id.state)
3177 goto discard;
3178
3179 switch (state) {
3180 case IB_CM_REQ_SENT:
3181 case IB_CM_MRA_REQ_RCVD:
3182 cm_reset_to_idle(cm_id_priv);
3183 cm_event.event = IB_CM_REQ_ERROR;
3184 break;
3185 case IB_CM_REP_SENT:
3186 case IB_CM_MRA_REP_RCVD:
3187 cm_reset_to_idle(cm_id_priv);
3188 cm_event.event = IB_CM_REP_ERROR;
3189 break;
3190 case IB_CM_DREQ_SENT:
3191 cm_enter_timewait(cm_id_priv);
3192 cm_event.event = IB_CM_DREQ_ERROR;
3193 break;
3194 case IB_CM_SIDR_REQ_SENT:
3195 cm_id_priv->id.state = IB_CM_IDLE;
3196 cm_event.event = IB_CM_SIDR_REQ_ERROR;
3197 break;
3198 default:
3199 goto discard;
3200 }
3201 spin_unlock_irq(&cm_id_priv->lock);
3202 cm_event.param.send_status = wc_status;
3203
3204 /* No other events can occur on the cm_id at this point. */
3205 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, &cm_event);
3206 cm_free_msg(msg);
3207 if (ret)
3208 ib_destroy_cm_id(&cm_id_priv->id);
3209 return;
3210 discard:
3211 spin_unlock_irq(&cm_id_priv->lock);
3212 cm_free_msg(msg);
3213 }
3214
cm_send_handler(struct ib_mad_agent * mad_agent,struct ib_mad_send_wc * mad_send_wc)3215 static void cm_send_handler(struct ib_mad_agent *mad_agent,
3216 struct ib_mad_send_wc *mad_send_wc)
3217 {
3218 struct ib_mad_send_buf *msg = mad_send_wc->send_buf;
3219 struct cm_port *port;
3220 u16 attr_index;
3221
3222 port = mad_agent->context;
3223 attr_index = be16_to_cpu(((struct ib_mad_hdr *)
3224 msg->mad)->attr_id) - CM_ATTR_ID_OFFSET;
3225
3226 /*
3227 * If the send was in response to a received message (context[0] is not
3228 * set to a cm_id), and is not a REJ, then it is a send that was
3229 * manually retried.
3230 */
3231 if (!msg->context[0] && (attr_index != CM_REJ_COUNTER))
3232 msg->retries = 1;
3233
3234 atomic_long_add(1 + msg->retries,
3235 &port->counter_group[CM_XMIT].counter[attr_index]);
3236 if (msg->retries)
3237 atomic_long_add(msg->retries,
3238 &port->counter_group[CM_XMIT_RETRIES].
3239 counter[attr_index]);
3240
3241 switch (mad_send_wc->status) {
3242 case IB_WC_SUCCESS:
3243 case IB_WC_WR_FLUSH_ERR:
3244 cm_free_msg(msg);
3245 break;
3246 default:
3247 if (msg->context[0] && msg->context[1])
3248 cm_process_send_error(msg, mad_send_wc->status);
3249 else
3250 cm_free_msg(msg);
3251 break;
3252 }
3253 }
3254
cm_work_handler(struct work_struct * _work)3255 static void cm_work_handler(struct work_struct *_work)
3256 {
3257 struct cm_work *work = container_of(_work, struct cm_work, work.work);
3258 int ret;
3259
3260 switch (work->cm_event.event) {
3261 case IB_CM_REQ_RECEIVED:
3262 ret = cm_req_handler(work);
3263 break;
3264 case IB_CM_MRA_RECEIVED:
3265 ret = cm_mra_handler(work);
3266 break;
3267 case IB_CM_REJ_RECEIVED:
3268 ret = cm_rej_handler(work);
3269 break;
3270 case IB_CM_REP_RECEIVED:
3271 ret = cm_rep_handler(work);
3272 break;
3273 case IB_CM_RTU_RECEIVED:
3274 ret = cm_rtu_handler(work);
3275 break;
3276 case IB_CM_USER_ESTABLISHED:
3277 ret = cm_establish_handler(work);
3278 break;
3279 case IB_CM_DREQ_RECEIVED:
3280 ret = cm_dreq_handler(work);
3281 break;
3282 case IB_CM_DREP_RECEIVED:
3283 ret = cm_drep_handler(work);
3284 break;
3285 case IB_CM_SIDR_REQ_RECEIVED:
3286 ret = cm_sidr_req_handler(work);
3287 break;
3288 case IB_CM_SIDR_REP_RECEIVED:
3289 ret = cm_sidr_rep_handler(work);
3290 break;
3291 case IB_CM_LAP_RECEIVED:
3292 ret = cm_lap_handler(work);
3293 break;
3294 case IB_CM_APR_RECEIVED:
3295 ret = cm_apr_handler(work);
3296 break;
3297 case IB_CM_TIMEWAIT_EXIT:
3298 ret = cm_timewait_handler(work);
3299 break;
3300 default:
3301 ret = -EINVAL;
3302 break;
3303 }
3304 if (ret)
3305 cm_free_work(work);
3306 }
3307
cm_establish(struct ib_cm_id * cm_id)3308 static int cm_establish(struct ib_cm_id *cm_id)
3309 {
3310 struct cm_id_private *cm_id_priv;
3311 struct cm_work *work;
3312 unsigned long flags;
3313 int ret = 0;
3314
3315 work = kmalloc(sizeof *work, GFP_ATOMIC);
3316 if (!work)
3317 return -ENOMEM;
3318
3319 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3320 spin_lock_irqsave(&cm_id_priv->lock, flags);
3321 switch (cm_id->state)
3322 {
3323 case IB_CM_REP_SENT:
3324 case IB_CM_MRA_REP_RCVD:
3325 cm_id->state = IB_CM_ESTABLISHED;
3326 break;
3327 case IB_CM_ESTABLISHED:
3328 ret = -EISCONN;
3329 break;
3330 default:
3331 ret = -EINVAL;
3332 break;
3333 }
3334 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3335
3336 if (ret) {
3337 kfree(work);
3338 goto out;
3339 }
3340
3341 /*
3342 * The CM worker thread may try to destroy the cm_id before it
3343 * can execute this work item. To prevent potential deadlock,
3344 * we need to find the cm_id once we're in the context of the
3345 * worker thread, rather than holding a reference on it.
3346 */
3347 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3348 work->local_id = cm_id->local_id;
3349 work->remote_id = cm_id->remote_id;
3350 work->mad_recv_wc = NULL;
3351 work->cm_event.event = IB_CM_USER_ESTABLISHED;
3352 queue_delayed_work(cm.wq, &work->work, 0);
3353 out:
3354 return ret;
3355 }
3356
cm_migrate(struct ib_cm_id * cm_id)3357 static int cm_migrate(struct ib_cm_id *cm_id)
3358 {
3359 struct cm_id_private *cm_id_priv;
3360 unsigned long flags;
3361 int ret = 0;
3362
3363 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3364 spin_lock_irqsave(&cm_id_priv->lock, flags);
3365 if (cm_id->state == IB_CM_ESTABLISHED &&
3366 (cm_id->lap_state == IB_CM_LAP_UNINIT ||
3367 cm_id->lap_state == IB_CM_LAP_IDLE)) {
3368 cm_id->lap_state = IB_CM_LAP_IDLE;
3369 cm_id_priv->av = cm_id_priv->alt_av;
3370 } else
3371 ret = -EINVAL;
3372 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3373
3374 return ret;
3375 }
3376
ib_cm_notify(struct ib_cm_id * cm_id,enum ib_event_type event)3377 int ib_cm_notify(struct ib_cm_id *cm_id, enum ib_event_type event)
3378 {
3379 int ret;
3380
3381 switch (event) {
3382 case IB_EVENT_COMM_EST:
3383 ret = cm_establish(cm_id);
3384 break;
3385 case IB_EVENT_PATH_MIG:
3386 ret = cm_migrate(cm_id);
3387 break;
3388 default:
3389 ret = -EINVAL;
3390 }
3391 return ret;
3392 }
3393 EXPORT_SYMBOL(ib_cm_notify);
3394
cm_recv_handler(struct ib_mad_agent * mad_agent,struct ib_mad_recv_wc * mad_recv_wc)3395 static void cm_recv_handler(struct ib_mad_agent *mad_agent,
3396 struct ib_mad_recv_wc *mad_recv_wc)
3397 {
3398 struct cm_port *port = mad_agent->context;
3399 struct cm_work *work;
3400 enum ib_cm_event_type event;
3401 u16 attr_id;
3402 int paths = 0;
3403
3404 switch (mad_recv_wc->recv_buf.mad->mad_hdr.attr_id) {
3405 case CM_REQ_ATTR_ID:
3406 paths = 1 + (((struct cm_req_msg *) mad_recv_wc->recv_buf.mad)->
3407 alt_local_lid != 0);
3408 event = IB_CM_REQ_RECEIVED;
3409 break;
3410 case CM_MRA_ATTR_ID:
3411 event = IB_CM_MRA_RECEIVED;
3412 break;
3413 case CM_REJ_ATTR_ID:
3414 event = IB_CM_REJ_RECEIVED;
3415 break;
3416 case CM_REP_ATTR_ID:
3417 event = IB_CM_REP_RECEIVED;
3418 break;
3419 case CM_RTU_ATTR_ID:
3420 event = IB_CM_RTU_RECEIVED;
3421 break;
3422 case CM_DREQ_ATTR_ID:
3423 event = IB_CM_DREQ_RECEIVED;
3424 break;
3425 case CM_DREP_ATTR_ID:
3426 event = IB_CM_DREP_RECEIVED;
3427 break;
3428 case CM_SIDR_REQ_ATTR_ID:
3429 event = IB_CM_SIDR_REQ_RECEIVED;
3430 break;
3431 case CM_SIDR_REP_ATTR_ID:
3432 event = IB_CM_SIDR_REP_RECEIVED;
3433 break;
3434 case CM_LAP_ATTR_ID:
3435 paths = 1;
3436 event = IB_CM_LAP_RECEIVED;
3437 break;
3438 case CM_APR_ATTR_ID:
3439 event = IB_CM_APR_RECEIVED;
3440 break;
3441 default:
3442 ib_free_recv_mad(mad_recv_wc);
3443 return;
3444 }
3445
3446 attr_id = be16_to_cpu(mad_recv_wc->recv_buf.mad->mad_hdr.attr_id);
3447 atomic_long_inc(&port->counter_group[CM_RECV].
3448 counter[attr_id - CM_ATTR_ID_OFFSET]);
3449
3450 work = kmalloc(sizeof *work + sizeof(struct ib_sa_path_rec) * paths,
3451 GFP_KERNEL);
3452 if (!work) {
3453 ib_free_recv_mad(mad_recv_wc);
3454 return;
3455 }
3456
3457 INIT_DELAYED_WORK(&work->work, cm_work_handler);
3458 work->cm_event.event = event;
3459 work->mad_recv_wc = mad_recv_wc;
3460 work->port = port;
3461 queue_delayed_work(cm.wq, &work->work, 0);
3462 }
3463
cm_init_qp_init_attr(struct cm_id_private * cm_id_priv,struct ib_qp_attr * qp_attr,int * qp_attr_mask)3464 static int cm_init_qp_init_attr(struct cm_id_private *cm_id_priv,
3465 struct ib_qp_attr *qp_attr,
3466 int *qp_attr_mask)
3467 {
3468 unsigned long flags;
3469 int ret;
3470
3471 spin_lock_irqsave(&cm_id_priv->lock, flags);
3472 switch (cm_id_priv->id.state) {
3473 case IB_CM_REQ_SENT:
3474 case IB_CM_MRA_REQ_RCVD:
3475 case IB_CM_REQ_RCVD:
3476 case IB_CM_MRA_REQ_SENT:
3477 case IB_CM_REP_RCVD:
3478 case IB_CM_MRA_REP_SENT:
3479 case IB_CM_REP_SENT:
3480 case IB_CM_MRA_REP_RCVD:
3481 case IB_CM_ESTABLISHED:
3482 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS |
3483 IB_QP_PKEY_INDEX | IB_QP_PORT;
3484 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE;
3485 if (cm_id_priv->responder_resources)
3486 qp_attr->qp_access_flags |= IB_ACCESS_REMOTE_READ |
3487 IB_ACCESS_REMOTE_ATOMIC;
3488 qp_attr->pkey_index = cm_id_priv->av.pkey_index;
3489 qp_attr->port_num = cm_id_priv->av.port->port_num;
3490 ret = 0;
3491 break;
3492 default:
3493 ret = -EINVAL;
3494 break;
3495 }
3496 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3497 return ret;
3498 }
3499
cm_init_qp_rtr_attr(struct cm_id_private * cm_id_priv,struct ib_qp_attr * qp_attr,int * qp_attr_mask)3500 static int cm_init_qp_rtr_attr(struct cm_id_private *cm_id_priv,
3501 struct ib_qp_attr *qp_attr,
3502 int *qp_attr_mask)
3503 {
3504 unsigned long flags;
3505 int ret;
3506
3507 spin_lock_irqsave(&cm_id_priv->lock, flags);
3508 switch (cm_id_priv->id.state) {
3509 case IB_CM_REQ_RCVD:
3510 case IB_CM_MRA_REQ_SENT:
3511 case IB_CM_REP_RCVD:
3512 case IB_CM_MRA_REP_SENT:
3513 case IB_CM_REP_SENT:
3514 case IB_CM_MRA_REP_RCVD:
3515 case IB_CM_ESTABLISHED:
3516 *qp_attr_mask = IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU |
3517 IB_QP_DEST_QPN | IB_QP_RQ_PSN;
3518 qp_attr->ah_attr = cm_id_priv->av.ah_attr;
3519 if (!cm_id_priv->av.valid) {
3520 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3521 return -EINVAL;
3522 }
3523 if (cm_id_priv->av.ah_attr.vlan_id != 0xffff) {
3524 qp_attr->vlan_id = cm_id_priv->av.ah_attr.vlan_id;
3525 *qp_attr_mask |= IB_QP_VID;
3526 }
3527 if (!is_zero_ether_addr(cm_id_priv->av.smac)) {
3528 memcpy(qp_attr->smac, cm_id_priv->av.smac,
3529 sizeof(qp_attr->smac));
3530 *qp_attr_mask |= IB_QP_SMAC;
3531 }
3532 if (cm_id_priv->alt_av.valid) {
3533 if (cm_id_priv->alt_av.ah_attr.vlan_id != 0xffff) {
3534 qp_attr->alt_vlan_id =
3535 cm_id_priv->alt_av.ah_attr.vlan_id;
3536 *qp_attr_mask |= IB_QP_ALT_VID;
3537 }
3538 if (!is_zero_ether_addr(cm_id_priv->alt_av.smac)) {
3539 memcpy(qp_attr->alt_smac,
3540 cm_id_priv->alt_av.smac,
3541 sizeof(qp_attr->alt_smac));
3542 *qp_attr_mask |= IB_QP_ALT_SMAC;
3543 }
3544 }
3545 qp_attr->path_mtu = cm_id_priv->path_mtu;
3546 qp_attr->dest_qp_num = be32_to_cpu(cm_id_priv->remote_qpn);
3547 qp_attr->rq_psn = be32_to_cpu(cm_id_priv->rq_psn);
3548 if (cm_id_priv->qp_type == IB_QPT_RC ||
3549 cm_id_priv->qp_type == IB_QPT_XRC_TGT) {
3550 *qp_attr_mask |= IB_QP_MAX_DEST_RD_ATOMIC |
3551 IB_QP_MIN_RNR_TIMER;
3552 qp_attr->max_dest_rd_atomic =
3553 cm_id_priv->responder_resources;
3554 qp_attr->min_rnr_timer = 0;
3555 }
3556 if (cm_id_priv->alt_av.ah_attr.dlid) {
3557 *qp_attr_mask |= IB_QP_ALT_PATH;
3558 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3559 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3560 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3561 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3562 }
3563 ret = 0;
3564 break;
3565 default:
3566 ret = -EINVAL;
3567 break;
3568 }
3569 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3570 return ret;
3571 }
3572
cm_init_qp_rts_attr(struct cm_id_private * cm_id_priv,struct ib_qp_attr * qp_attr,int * qp_attr_mask)3573 static int cm_init_qp_rts_attr(struct cm_id_private *cm_id_priv,
3574 struct ib_qp_attr *qp_attr,
3575 int *qp_attr_mask)
3576 {
3577 unsigned long flags;
3578 int ret;
3579
3580 spin_lock_irqsave(&cm_id_priv->lock, flags);
3581 switch (cm_id_priv->id.state) {
3582 /* Allow transition to RTS before sending REP */
3583 case IB_CM_REQ_RCVD:
3584 case IB_CM_MRA_REQ_SENT:
3585
3586 case IB_CM_REP_RCVD:
3587 case IB_CM_MRA_REP_SENT:
3588 case IB_CM_REP_SENT:
3589 case IB_CM_MRA_REP_RCVD:
3590 case IB_CM_ESTABLISHED:
3591 if (cm_id_priv->id.lap_state == IB_CM_LAP_UNINIT) {
3592 *qp_attr_mask = IB_QP_STATE | IB_QP_SQ_PSN;
3593 qp_attr->sq_psn = be32_to_cpu(cm_id_priv->sq_psn);
3594 switch (cm_id_priv->qp_type) {
3595 case IB_QPT_RC:
3596 case IB_QPT_XRC_INI:
3597 *qp_attr_mask |= IB_QP_RETRY_CNT | IB_QP_RNR_RETRY |
3598 IB_QP_MAX_QP_RD_ATOMIC;
3599 qp_attr->retry_cnt = cm_id_priv->retry_count;
3600 qp_attr->rnr_retry = cm_id_priv->rnr_retry_count;
3601 qp_attr->max_rd_atomic = cm_id_priv->initiator_depth;
3602 /* fall through */
3603 case IB_QPT_XRC_TGT:
3604 *qp_attr_mask |= IB_QP_TIMEOUT;
3605 qp_attr->timeout = cm_id_priv->av.timeout;
3606 break;
3607 default:
3608 break;
3609 }
3610 if (cm_id_priv->alt_av.ah_attr.dlid) {
3611 *qp_attr_mask |= IB_QP_PATH_MIG_STATE;
3612 qp_attr->path_mig_state = IB_MIG_REARM;
3613 }
3614 } else {
3615 *qp_attr_mask = IB_QP_ALT_PATH | IB_QP_PATH_MIG_STATE;
3616 qp_attr->alt_port_num = cm_id_priv->alt_av.port->port_num;
3617 qp_attr->alt_pkey_index = cm_id_priv->alt_av.pkey_index;
3618 qp_attr->alt_timeout = cm_id_priv->alt_av.timeout;
3619 qp_attr->alt_ah_attr = cm_id_priv->alt_av.ah_attr;
3620 qp_attr->path_mig_state = IB_MIG_REARM;
3621 }
3622 ret = 0;
3623 break;
3624 default:
3625 ret = -EINVAL;
3626 break;
3627 }
3628 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
3629 return ret;
3630 }
3631
ib_cm_init_qp_attr(struct ib_cm_id * cm_id,struct ib_qp_attr * qp_attr,int * qp_attr_mask)3632 int ib_cm_init_qp_attr(struct ib_cm_id *cm_id,
3633 struct ib_qp_attr *qp_attr,
3634 int *qp_attr_mask)
3635 {
3636 struct cm_id_private *cm_id_priv;
3637 int ret;
3638
3639 cm_id_priv = container_of(cm_id, struct cm_id_private, id);
3640 switch (qp_attr->qp_state) {
3641 case IB_QPS_INIT:
3642 ret = cm_init_qp_init_attr(cm_id_priv, qp_attr, qp_attr_mask);
3643 break;
3644 case IB_QPS_RTR:
3645 ret = cm_init_qp_rtr_attr(cm_id_priv, qp_attr, qp_attr_mask);
3646 break;
3647 case IB_QPS_RTS:
3648 ret = cm_init_qp_rts_attr(cm_id_priv, qp_attr, qp_attr_mask);
3649 break;
3650 default:
3651 ret = -EINVAL;
3652 break;
3653 }
3654 return ret;
3655 }
3656 EXPORT_SYMBOL(ib_cm_init_qp_attr);
3657
cm_get_ack_delay(struct cm_device * cm_dev)3658 static void cm_get_ack_delay(struct cm_device *cm_dev)
3659 {
3660 struct ib_device_attr attr;
3661
3662 if (ib_query_device(cm_dev->ib_device, &attr))
3663 cm_dev->ack_delay = 0; /* acks will rely on packet life time */
3664 else
3665 cm_dev->ack_delay = attr.local_ca_ack_delay;
3666 }
3667
cm_show_counter(struct kobject * obj,struct attribute * attr,char * buf)3668 static ssize_t cm_show_counter(struct kobject *obj, struct attribute *attr,
3669 char *buf)
3670 {
3671 struct cm_counter_group *group;
3672 struct cm_counter_attribute *cm_attr;
3673
3674 group = container_of(obj, struct cm_counter_group, obj);
3675 cm_attr = container_of(attr, struct cm_counter_attribute, attr);
3676
3677 return sprintf(buf, "%ld\n",
3678 atomic_long_read(&group->counter[cm_attr->index]));
3679 }
3680
3681 static const struct sysfs_ops cm_counter_ops = {
3682 .show = cm_show_counter
3683 };
3684
3685 static struct kobj_type cm_counter_obj_type = {
3686 .sysfs_ops = &cm_counter_ops,
3687 .default_attrs = cm_counter_default_attrs
3688 };
3689
cm_release_port_obj(struct kobject * obj)3690 static void cm_release_port_obj(struct kobject *obj)
3691 {
3692 struct cm_port *cm_port;
3693
3694 cm_port = container_of(obj, struct cm_port, port_obj);
3695 kfree(cm_port);
3696 }
3697
3698 static struct kobj_type cm_port_obj_type = {
3699 .release = cm_release_port_obj
3700 };
3701
cm_devnode(struct device * dev,umode_t * mode)3702 static char *cm_devnode(struct device *dev, umode_t *mode)
3703 {
3704 if (mode)
3705 *mode = 0666;
3706 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
3707 }
3708
3709 struct class cm_class = {
3710 .owner = THIS_MODULE,
3711 .name = "infiniband_cm",
3712 .devnode = cm_devnode,
3713 };
3714 EXPORT_SYMBOL(cm_class);
3715
cm_create_port_fs(struct cm_port * port)3716 static int cm_create_port_fs(struct cm_port *port)
3717 {
3718 int i, ret;
3719
3720 ret = kobject_init_and_add(&port->port_obj, &cm_port_obj_type,
3721 &port->cm_dev->device->kobj,
3722 "%d", port->port_num);
3723 if (ret) {
3724 kfree(port);
3725 return ret;
3726 }
3727
3728 for (i = 0; i < CM_COUNTER_GROUPS; i++) {
3729 ret = kobject_init_and_add(&port->counter_group[i].obj,
3730 &cm_counter_obj_type,
3731 &port->port_obj,
3732 "%s", counter_group_names[i]);
3733 if (ret)
3734 goto error;
3735 }
3736
3737 return 0;
3738
3739 error:
3740 while (i--)
3741 kobject_put(&port->counter_group[i].obj);
3742 kobject_put(&port->port_obj);
3743 return ret;
3744
3745 }
3746
cm_remove_port_fs(struct cm_port * port)3747 static void cm_remove_port_fs(struct cm_port *port)
3748 {
3749 int i;
3750
3751 for (i = 0; i < CM_COUNTER_GROUPS; i++)
3752 kobject_put(&port->counter_group[i].obj);
3753
3754 kobject_put(&port->port_obj);
3755 }
3756
cm_add_one(struct ib_device * ib_device)3757 static void cm_add_one(struct ib_device *ib_device)
3758 {
3759 struct cm_device *cm_dev;
3760 struct cm_port *port;
3761 struct ib_mad_reg_req reg_req = {
3762 .mgmt_class = IB_MGMT_CLASS_CM,
3763 .mgmt_class_version = IB_CM_CLASS_VERSION,
3764 };
3765 struct ib_port_modify port_modify = {
3766 .set_port_cap_mask = IB_PORT_CM_SUP
3767 };
3768 unsigned long flags;
3769 int ret;
3770 u8 i;
3771
3772 if (rdma_node_get_transport(ib_device->node_type) != RDMA_TRANSPORT_IB)
3773 return;
3774
3775 cm_dev = kzalloc(sizeof(*cm_dev) + sizeof(*port) *
3776 ib_device->phys_port_cnt, GFP_KERNEL);
3777 if (!cm_dev)
3778 return;
3779
3780 cm_dev->ib_device = ib_device;
3781 cm_get_ack_delay(cm_dev);
3782
3783 cm_dev->device = device_create(&cm_class, &ib_device->dev,
3784 MKDEV(0, 0), NULL,
3785 "%s", ib_device->name);
3786 if (IS_ERR(cm_dev->device)) {
3787 kfree(cm_dev);
3788 return;
3789 }
3790
3791 set_bit(IB_MGMT_METHOD_SEND, reg_req.method_mask);
3792 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3793 port = kzalloc(sizeof *port, GFP_KERNEL);
3794 if (!port)
3795 goto error1;
3796
3797 cm_dev->port[i-1] = port;
3798 port->cm_dev = cm_dev;
3799 port->port_num = i;
3800
3801 ret = cm_create_port_fs(port);
3802 if (ret)
3803 goto error1;
3804
3805 port->mad_agent = ib_register_mad_agent(ib_device, i,
3806 IB_QPT_GSI,
3807 ®_req,
3808 0,
3809 cm_send_handler,
3810 cm_recv_handler,
3811 port,
3812 0);
3813 if (IS_ERR(port->mad_agent))
3814 goto error2;
3815
3816 ret = ib_modify_port(ib_device, i, 0, &port_modify);
3817 if (ret)
3818 goto error3;
3819 }
3820 ib_set_client_data(ib_device, &cm_client, cm_dev);
3821
3822 write_lock_irqsave(&cm.device_lock, flags);
3823 list_add_tail(&cm_dev->list, &cm.device_list);
3824 write_unlock_irqrestore(&cm.device_lock, flags);
3825 return;
3826
3827 error3:
3828 ib_unregister_mad_agent(port->mad_agent);
3829 error2:
3830 cm_remove_port_fs(port);
3831 error1:
3832 port_modify.set_port_cap_mask = 0;
3833 port_modify.clr_port_cap_mask = IB_PORT_CM_SUP;
3834 while (--i) {
3835 port = cm_dev->port[i-1];
3836 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3837 ib_unregister_mad_agent(port->mad_agent);
3838 cm_remove_port_fs(port);
3839 }
3840 device_unregister(cm_dev->device);
3841 kfree(cm_dev);
3842 }
3843
cm_remove_one(struct ib_device * ib_device)3844 static void cm_remove_one(struct ib_device *ib_device)
3845 {
3846 struct cm_device *cm_dev;
3847 struct cm_port *port;
3848 struct ib_port_modify port_modify = {
3849 .clr_port_cap_mask = IB_PORT_CM_SUP
3850 };
3851 unsigned long flags;
3852 int i;
3853
3854 cm_dev = ib_get_client_data(ib_device, &cm_client);
3855 if (!cm_dev)
3856 return;
3857
3858 write_lock_irqsave(&cm.device_lock, flags);
3859 list_del(&cm_dev->list);
3860 write_unlock_irqrestore(&cm.device_lock, flags);
3861
3862 for (i = 1; i <= ib_device->phys_port_cnt; i++) {
3863 port = cm_dev->port[i-1];
3864 ib_modify_port(ib_device, port->port_num, 0, &port_modify);
3865 ib_unregister_mad_agent(port->mad_agent);
3866 flush_workqueue(cm.wq);
3867 cm_remove_port_fs(port);
3868 }
3869 device_unregister(cm_dev->device);
3870 kfree(cm_dev);
3871 }
3872
ib_cm_init(void)3873 static int __init ib_cm_init(void)
3874 {
3875 int ret;
3876
3877 memset(&cm, 0, sizeof cm);
3878 INIT_LIST_HEAD(&cm.device_list);
3879 rwlock_init(&cm.device_lock);
3880 spin_lock_init(&cm.lock);
3881 cm.listen_service_table = RB_ROOT;
3882 cm.listen_service_id = be64_to_cpu(IB_CM_ASSIGN_SERVICE_ID);
3883 cm.remote_id_table = RB_ROOT;
3884 cm.remote_qp_table = RB_ROOT;
3885 cm.remote_sidr_table = RB_ROOT;
3886 idr_init(&cm.local_id_table);
3887 get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);
3888 INIT_LIST_HEAD(&cm.timewait_list);
3889
3890 ret = class_register(&cm_class);
3891 if (ret) {
3892 ret = -ENOMEM;
3893 goto error1;
3894 }
3895
3896 cm.wq = create_workqueue("ib_cm");
3897 if (!cm.wq) {
3898 ret = -ENOMEM;
3899 goto error2;
3900 }
3901
3902 ret = ib_register_client(&cm_client);
3903 if (ret)
3904 goto error3;
3905
3906 return 0;
3907 error3:
3908 destroy_workqueue(cm.wq);
3909 error2:
3910 class_unregister(&cm_class);
3911 error1:
3912 idr_destroy(&cm.local_id_table);
3913 return ret;
3914 }
3915
ib_cm_cleanup(void)3916 static void __exit ib_cm_cleanup(void)
3917 {
3918 struct cm_timewait_info *timewait_info, *tmp;
3919
3920 spin_lock_irq(&cm.lock);
3921 list_for_each_entry(timewait_info, &cm.timewait_list, list)
3922 cancel_delayed_work(&timewait_info->work.work);
3923 spin_unlock_irq(&cm.lock);
3924
3925 ib_unregister_client(&cm_client);
3926 destroy_workqueue(cm.wq);
3927
3928 list_for_each_entry_safe(timewait_info, tmp, &cm.timewait_list, list) {
3929 list_del(&timewait_info->list);
3930 kfree(timewait_info);
3931 }
3932
3933 class_unregister(&cm_class);
3934 idr_destroy(&cm.local_id_table);
3935 }
3936
3937 module_init(ib_cm_init);
3938 module_exit(ib_cm_cleanup);
3939
3940