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[mirror_ubuntu-zesty-kernel.git] / drivers / infiniband / core / sa_query.c
1 /*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Voltaire, Inc.  All rights reserved.
4 * Copyright (c) 2006 Intel Corporation. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 *
34 * $Id: sa_query.c 2811 2005-07-06 18:11:43Z halr $
35 */
36
37 #include <linux/module.h>
38 #include <linux/init.h>
39 #include <linux/err.h>
40 #include <linux/random.h>
41 #include <linux/spinlock.h>
42 #include <linux/slab.h>
43 #include <linux/pci.h>
44 #include <linux/dma-mapping.h>
45 #include <linux/kref.h>
46 #include <linux/idr.h>
47 #include <linux/workqueue.h>
48
49 #include <rdma/ib_pack.h>
50 #include <rdma/ib_sa.h>
51 #include <rdma/ib_cache.h>
52
53 MODULE_AUTHOR("Roland Dreier");
54 MODULE_DESCRIPTION("InfiniBand subnet administration query support");
55 MODULE_LICENSE("Dual BSD/GPL");
56
57 struct ib_sa_sm_ah {
58 struct ib_ah *ah;
59 struct kref ref;
60 };
61
62 struct ib_sa_port {
63 struct ib_mad_agent *agent;
64 struct ib_sa_sm_ah *sm_ah;
65 struct work_struct update_task;
66 spinlock_t ah_lock;
67 u8 port_num;
68 };
69
70 struct ib_sa_device {
71 int start_port, end_port;
72 struct ib_event_handler event_handler;
73 struct ib_sa_port port[0];
74 };
75
76 struct ib_sa_query {
77 void (*callback)(struct ib_sa_query *, int, struct ib_sa_mad *);
78 void (*release)(struct ib_sa_query *);
79 struct ib_sa_client *client;
80 struct ib_sa_port *port;
81 struct ib_mad_send_buf *mad_buf;
82 struct ib_sa_sm_ah *sm_ah;
83 int id;
84 };
85
86 struct ib_sa_service_query {
87 void (*callback)(int, struct ib_sa_service_rec *, void *);
88 void *context;
89 struct ib_sa_query sa_query;
90 };
91
92 struct ib_sa_path_query {
93 void (*callback)(int, struct ib_sa_path_rec *, void *);
94 void *context;
95 struct ib_sa_query sa_query;
96 };
97
98 struct ib_sa_mcmember_query {
99 void (*callback)(int, struct ib_sa_mcmember_rec *, void *);
100 void *context;
101 struct ib_sa_query sa_query;
102 };
103
104 static void ib_sa_add_one(struct ib_device *device);
105 static void ib_sa_remove_one(struct ib_device *device);
106
107 static struct ib_client sa_client = {
108 .name = "sa",
109 .add = ib_sa_add_one,
110 .remove = ib_sa_remove_one
111 };
112
113 static spinlock_t idr_lock;
114 static DEFINE_IDR(query_idr);
115
116 static spinlock_t tid_lock;
117 static u32 tid;
118
119 #define PATH_REC_FIELD(field) \
120 .struct_offset_bytes = offsetof(struct ib_sa_path_rec, field), \
121 .struct_size_bytes = sizeof ((struct ib_sa_path_rec *) 0)->field, \
122 .field_name = "sa_path_rec:" #field
123
124 static const struct ib_field path_rec_table[] = {
125 { RESERVED,
126 .offset_words = 0,
127 .offset_bits = 0,
128 .size_bits = 32 },
129 { RESERVED,
130 .offset_words = 1,
131 .offset_bits = 0,
132 .size_bits = 32 },
133 { PATH_REC_FIELD(dgid),
134 .offset_words = 2,
135 .offset_bits = 0,
136 .size_bits = 128 },
137 { PATH_REC_FIELD(sgid),
138 .offset_words = 6,
139 .offset_bits = 0,
140 .size_bits = 128 },
141 { PATH_REC_FIELD(dlid),
142 .offset_words = 10,
143 .offset_bits = 0,
144 .size_bits = 16 },
145 { PATH_REC_FIELD(slid),
146 .offset_words = 10,
147 .offset_bits = 16,
148 .size_bits = 16 },
149 { PATH_REC_FIELD(raw_traffic),
150 .offset_words = 11,
151 .offset_bits = 0,
152 .size_bits = 1 },
153 { RESERVED,
154 .offset_words = 11,
155 .offset_bits = 1,
156 .size_bits = 3 },
157 { PATH_REC_FIELD(flow_label),
158 .offset_words = 11,
159 .offset_bits = 4,
160 .size_bits = 20 },
161 { PATH_REC_FIELD(hop_limit),
162 .offset_words = 11,
163 .offset_bits = 24,
164 .size_bits = 8 },
165 { PATH_REC_FIELD(traffic_class),
166 .offset_words = 12,
167 .offset_bits = 0,
168 .size_bits = 8 },
169 { PATH_REC_FIELD(reversible),
170 .offset_words = 12,
171 .offset_bits = 8,
172 .size_bits = 1 },
173 { PATH_REC_FIELD(numb_path),
174 .offset_words = 12,
175 .offset_bits = 9,
176 .size_bits = 7 },
177 { PATH_REC_FIELD(pkey),
178 .offset_words = 12,
179 .offset_bits = 16,
180 .size_bits = 16 },
181 { RESERVED,
182 .offset_words = 13,
183 .offset_bits = 0,
184 .size_bits = 12 },
185 { PATH_REC_FIELD(sl),
186 .offset_words = 13,
187 .offset_bits = 12,
188 .size_bits = 4 },
189 { PATH_REC_FIELD(mtu_selector),
190 .offset_words = 13,
191 .offset_bits = 16,
192 .size_bits = 2 },
193 { PATH_REC_FIELD(mtu),
194 .offset_words = 13,
195 .offset_bits = 18,
196 .size_bits = 6 },
197 { PATH_REC_FIELD(rate_selector),
198 .offset_words = 13,
199 .offset_bits = 24,
200 .size_bits = 2 },
201 { PATH_REC_FIELD(rate),
202 .offset_words = 13,
203 .offset_bits = 26,
204 .size_bits = 6 },
205 { PATH_REC_FIELD(packet_life_time_selector),
206 .offset_words = 14,
207 .offset_bits = 0,
208 .size_bits = 2 },
209 { PATH_REC_FIELD(packet_life_time),
210 .offset_words = 14,
211 .offset_bits = 2,
212 .size_bits = 6 },
213 { PATH_REC_FIELD(preference),
214 .offset_words = 14,
215 .offset_bits = 8,
216 .size_bits = 8 },
217 { RESERVED,
218 .offset_words = 14,
219 .offset_bits = 16,
220 .size_bits = 48 },
221 };
222
223 #define MCMEMBER_REC_FIELD(field) \
224 .struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field), \
225 .struct_size_bytes = sizeof ((struct ib_sa_mcmember_rec *) 0)->field, \
226 .field_name = "sa_mcmember_rec:" #field
227
228 static const struct ib_field mcmember_rec_table[] = {
229 { MCMEMBER_REC_FIELD(mgid),
230 .offset_words = 0,
231 .offset_bits = 0,
232 .size_bits = 128 },
233 { MCMEMBER_REC_FIELD(port_gid),
234 .offset_words = 4,
235 .offset_bits = 0,
236 .size_bits = 128 },
237 { MCMEMBER_REC_FIELD(qkey),
238 .offset_words = 8,
239 .offset_bits = 0,
240 .size_bits = 32 },
241 { MCMEMBER_REC_FIELD(mlid),
242 .offset_words = 9,
243 .offset_bits = 0,
244 .size_bits = 16 },
245 { MCMEMBER_REC_FIELD(mtu_selector),
246 .offset_words = 9,
247 .offset_bits = 16,
248 .size_bits = 2 },
249 { MCMEMBER_REC_FIELD(mtu),
250 .offset_words = 9,
251 .offset_bits = 18,
252 .size_bits = 6 },
253 { MCMEMBER_REC_FIELD(traffic_class),
254 .offset_words = 9,
255 .offset_bits = 24,
256 .size_bits = 8 },
257 { MCMEMBER_REC_FIELD(pkey),
258 .offset_words = 10,
259 .offset_bits = 0,
260 .size_bits = 16 },
261 { MCMEMBER_REC_FIELD(rate_selector),
262 .offset_words = 10,
263 .offset_bits = 16,
264 .size_bits = 2 },
265 { MCMEMBER_REC_FIELD(rate),
266 .offset_words = 10,
267 .offset_bits = 18,
268 .size_bits = 6 },
269 { MCMEMBER_REC_FIELD(packet_life_time_selector),
270 .offset_words = 10,
271 .offset_bits = 24,
272 .size_bits = 2 },
273 { MCMEMBER_REC_FIELD(packet_life_time),
274 .offset_words = 10,
275 .offset_bits = 26,
276 .size_bits = 6 },
277 { MCMEMBER_REC_FIELD(sl),
278 .offset_words = 11,
279 .offset_bits = 0,
280 .size_bits = 4 },
281 { MCMEMBER_REC_FIELD(flow_label),
282 .offset_words = 11,
283 .offset_bits = 4,
284 .size_bits = 20 },
285 { MCMEMBER_REC_FIELD(hop_limit),
286 .offset_words = 11,
287 .offset_bits = 24,
288 .size_bits = 8 },
289 { MCMEMBER_REC_FIELD(scope),
290 .offset_words = 12,
291 .offset_bits = 0,
292 .size_bits = 4 },
293 { MCMEMBER_REC_FIELD(join_state),
294 .offset_words = 12,
295 .offset_bits = 4,
296 .size_bits = 4 },
297 { MCMEMBER_REC_FIELD(proxy_join),
298 .offset_words = 12,
299 .offset_bits = 8,
300 .size_bits = 1 },
301 { RESERVED,
302 .offset_words = 12,
303 .offset_bits = 9,
304 .size_bits = 23 },
305 };
306
307 #define SERVICE_REC_FIELD(field) \
308 .struct_offset_bytes = offsetof(struct ib_sa_service_rec, field), \
309 .struct_size_bytes = sizeof ((struct ib_sa_service_rec *) 0)->field, \
310 .field_name = "sa_service_rec:" #field
311
312 static const struct ib_field service_rec_table[] = {
313 { SERVICE_REC_FIELD(id),
314 .offset_words = 0,
315 .offset_bits = 0,
316 .size_bits = 64 },
317 { SERVICE_REC_FIELD(gid),
318 .offset_words = 2,
319 .offset_bits = 0,
320 .size_bits = 128 },
321 { SERVICE_REC_FIELD(pkey),
322 .offset_words = 6,
323 .offset_bits = 0,
324 .size_bits = 16 },
325 { SERVICE_REC_FIELD(lease),
326 .offset_words = 7,
327 .offset_bits = 0,
328 .size_bits = 32 },
329 { SERVICE_REC_FIELD(key),
330 .offset_words = 8,
331 .offset_bits = 0,
332 .size_bits = 128 },
333 { SERVICE_REC_FIELD(name),
334 .offset_words = 12,
335 .offset_bits = 0,
336 .size_bits = 64*8 },
337 { SERVICE_REC_FIELD(data8),
338 .offset_words = 28,
339 .offset_bits = 0,
340 .size_bits = 16*8 },
341 { SERVICE_REC_FIELD(data16),
342 .offset_words = 32,
343 .offset_bits = 0,
344 .size_bits = 8*16 },
345 { SERVICE_REC_FIELD(data32),
346 .offset_words = 36,
347 .offset_bits = 0,
348 .size_bits = 4*32 },
349 { SERVICE_REC_FIELD(data64),
350 .offset_words = 40,
351 .offset_bits = 0,
352 .size_bits = 2*64 },
353 };
354
355 static void free_sm_ah(struct kref *kref)
356 {
357 struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref);
358
359 ib_destroy_ah(sm_ah->ah);
360 kfree(sm_ah);
361 }
362
363 static void update_sm_ah(struct work_struct *work)
364 {
365 struct ib_sa_port *port =
366 container_of(work, struct ib_sa_port, update_task);
367 struct ib_sa_sm_ah *new_ah, *old_ah;
368 struct ib_port_attr port_attr;
369 struct ib_ah_attr ah_attr;
370
371 if (ib_query_port(port->agent->device, port->port_num, &port_attr)) {
372 printk(KERN_WARNING "Couldn't query port\n");
373 return;
374 }
375
376 new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL);
377 if (!new_ah) {
378 printk(KERN_WARNING "Couldn't allocate new SM AH\n");
379 return;
380 }
381
382 kref_init(&new_ah->ref);
383
384 memset(&ah_attr, 0, sizeof ah_attr);
385 ah_attr.dlid = port_attr.sm_lid;
386 ah_attr.sl = port_attr.sm_sl;
387 ah_attr.port_num = port->port_num;
388
389 new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr);
390 if (IS_ERR(new_ah->ah)) {
391 printk(KERN_WARNING "Couldn't create new SM AH\n");
392 kfree(new_ah);
393 return;
394 }
395
396 spin_lock_irq(&port->ah_lock);
397 old_ah = port->sm_ah;
398 port->sm_ah = new_ah;
399 spin_unlock_irq(&port->ah_lock);
400
401 if (old_ah)
402 kref_put(&old_ah->ref, free_sm_ah);
403 }
404
405 static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event)
406 {
407 if (event->event == IB_EVENT_PORT_ERR ||
408 event->event == IB_EVENT_PORT_ACTIVE ||
409 event->event == IB_EVENT_LID_CHANGE ||
410 event->event == IB_EVENT_PKEY_CHANGE ||
411 event->event == IB_EVENT_SM_CHANGE ||
412 event->event == IB_EVENT_CLIENT_REREGISTER) {
413 struct ib_sa_device *sa_dev;
414 sa_dev = container_of(handler, typeof(*sa_dev), event_handler);
415
416 schedule_work(&sa_dev->port[event->element.port_num -
417 sa_dev->start_port].update_task);
418 }
419 }
420
421 void ib_sa_register_client(struct ib_sa_client *client)
422 {
423 atomic_set(&client->users, 1);
424 init_completion(&client->comp);
425 }
426 EXPORT_SYMBOL(ib_sa_register_client);
427
428 static inline void ib_sa_client_get(struct ib_sa_client *client)
429 {
430 atomic_inc(&client->users);
431 }
432
433 static inline void ib_sa_client_put(struct ib_sa_client *client)
434 {
435 if (atomic_dec_and_test(&client->users))
436 complete(&client->comp);
437 }
438
439 void ib_sa_unregister_client(struct ib_sa_client *client)
440 {
441 ib_sa_client_put(client);
442 wait_for_completion(&client->comp);
443 }
444 EXPORT_SYMBOL(ib_sa_unregister_client);
445
446 /**
447 * ib_sa_cancel_query - try to cancel an SA query
448 * @id:ID of query to cancel
449 * @query:query pointer to cancel
450 *
451 * Try to cancel an SA query. If the id and query don't match up or
452 * the query has already completed, nothing is done. Otherwise the
453 * query is canceled and will complete with a status of -EINTR.
454 */
455 void ib_sa_cancel_query(int id, struct ib_sa_query *query)
456 {
457 unsigned long flags;
458 struct ib_mad_agent *agent;
459 struct ib_mad_send_buf *mad_buf;
460
461 spin_lock_irqsave(&idr_lock, flags);
462 if (idr_find(&query_idr, id) != query) {
463 spin_unlock_irqrestore(&idr_lock, flags);
464 return;
465 }
466 agent = query->port->agent;
467 mad_buf = query->mad_buf;
468 spin_unlock_irqrestore(&idr_lock, flags);
469
470 ib_cancel_mad(agent, mad_buf);
471 }
472 EXPORT_SYMBOL(ib_sa_cancel_query);
473
474 int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
475 struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr)
476 {
477 int ret;
478 u16 gid_index;
479
480 memset(ah_attr, 0, sizeof *ah_attr);
481 ah_attr->dlid = be16_to_cpu(rec->dlid);
482 ah_attr->sl = rec->sl;
483 ah_attr->src_path_bits = be16_to_cpu(rec->slid) & 0x7f;
484 ah_attr->port_num = port_num;
485
486 if (rec->hop_limit > 1) {
487 ah_attr->ah_flags = IB_AH_GRH;
488 ah_attr->grh.dgid = rec->dgid;
489
490 ret = ib_find_cached_gid(device, &rec->sgid, &port_num,
491 &gid_index);
492 if (ret)
493 return ret;
494
495 ah_attr->grh.sgid_index = gid_index;
496 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
497 ah_attr->grh.hop_limit = rec->hop_limit;
498 ah_attr->grh.traffic_class = rec->traffic_class;
499 }
500 return 0;
501 }
502 EXPORT_SYMBOL(ib_init_ah_from_path);
503
504 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
505 {
506 unsigned long flags;
507
508 memset(mad, 0, sizeof *mad);
509
510 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION;
511 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
512 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
513
514 spin_lock_irqsave(&tid_lock, flags);
515 mad->mad_hdr.tid =
516 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
517 spin_unlock_irqrestore(&tid_lock, flags);
518 }
519
520 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask)
521 {
522 unsigned long flags;
523 int ret, id;
524
525 retry:
526 if (!idr_pre_get(&query_idr, gfp_mask))
527 return -ENOMEM;
528 spin_lock_irqsave(&idr_lock, flags);
529 ret = idr_get_new(&query_idr, query, &id);
530 spin_unlock_irqrestore(&idr_lock, flags);
531 if (ret == -EAGAIN)
532 goto retry;
533 if (ret)
534 return ret;
535
536 query->mad_buf->timeout_ms = timeout_ms;
537 query->mad_buf->context[0] = query;
538 query->id = id;
539
540 spin_lock_irqsave(&query->port->ah_lock, flags);
541 kref_get(&query->port->sm_ah->ref);
542 query->sm_ah = query->port->sm_ah;
543 spin_unlock_irqrestore(&query->port->ah_lock, flags);
544
545 query->mad_buf->ah = query->sm_ah->ah;
546
547 ret = ib_post_send_mad(query->mad_buf, NULL);
548 if (ret) {
549 spin_lock_irqsave(&idr_lock, flags);
550 idr_remove(&query_idr, id);
551 spin_unlock_irqrestore(&idr_lock, flags);
552
553 kref_put(&query->sm_ah->ref, free_sm_ah);
554 }
555
556 /*
557 * It's not safe to dereference query any more, because the
558 * send may already have completed and freed the query in
559 * another context.
560 */
561 return ret ? ret : id;
562 }
563
564 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
565 int status,
566 struct ib_sa_mad *mad)
567 {
568 struct ib_sa_path_query *query =
569 container_of(sa_query, struct ib_sa_path_query, sa_query);
570
571 if (mad) {
572 struct ib_sa_path_rec rec;
573
574 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
575 mad->data, &rec);
576 query->callback(status, &rec, query->context);
577 } else
578 query->callback(status, NULL, query->context);
579 }
580
581 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
582 {
583 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query));
584 }
585
586 /**
587 * ib_sa_path_rec_get - Start a Path get query
588 * @client:SA client
589 * @device:device to send query on
590 * @port_num: port number to send query on
591 * @rec:Path Record to send in query
592 * @comp_mask:component mask to send in query
593 * @timeout_ms:time to wait for response
594 * @gfp_mask:GFP mask to use for internal allocations
595 * @callback:function called when query completes, times out or is
596 * canceled
597 * @context:opaque user context passed to callback
598 * @sa_query:query context, used to cancel query
599 *
600 * Send a Path Record Get query to the SA to look up a path. The
601 * callback function will be called when the query completes (or
602 * fails); status is 0 for a successful response, -EINTR if the query
603 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
604 * occurred sending the query. The resp parameter of the callback is
605 * only valid if status is 0.
606 *
607 * If the return value of ib_sa_path_rec_get() is negative, it is an
608 * error code. Otherwise it is a query ID that can be used to cancel
609 * the query.
610 */
611 int ib_sa_path_rec_get(struct ib_sa_client *client,
612 struct ib_device *device, u8 port_num,
613 struct ib_sa_path_rec *rec,
614 ib_sa_comp_mask comp_mask,
615 int timeout_ms, gfp_t gfp_mask,
616 void (*callback)(int status,
617 struct ib_sa_path_rec *resp,
618 void *context),
619 void *context,
620 struct ib_sa_query **sa_query)
621 {
622 struct ib_sa_path_query *query;
623 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
624 struct ib_sa_port *port;
625 struct ib_mad_agent *agent;
626 struct ib_sa_mad *mad;
627 int ret;
628
629 if (!sa_dev)
630 return -ENODEV;
631
632 port = &sa_dev->port[port_num - sa_dev->start_port];
633 agent = port->agent;
634
635 query = kmalloc(sizeof *query, gfp_mask);
636 if (!query)
637 return -ENOMEM;
638
639 query->sa_query.mad_buf = ib_create_send_mad(agent, 1, 0,
640 0, IB_MGMT_SA_HDR,
641 IB_MGMT_SA_DATA, gfp_mask);
642 if (!query->sa_query.mad_buf) {
643 ret = -ENOMEM;
644 goto err1;
645 }
646
647 ib_sa_client_get(client);
648 query->sa_query.client = client;
649 query->callback = callback;
650 query->context = context;
651
652 mad = query->sa_query.mad_buf->mad;
653 init_mad(mad, agent);
654
655 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
656 query->sa_query.release = ib_sa_path_rec_release;
657 query->sa_query.port = port;
658 mad->mad_hdr.method = IB_MGMT_METHOD_GET;
659 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC);
660 mad->sa_hdr.comp_mask = comp_mask;
661
662 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data);
663
664 *sa_query = &query->sa_query;
665
666 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
667 if (ret < 0)
668 goto err2;
669
670 return ret;
671
672 err2:
673 *sa_query = NULL;
674 ib_sa_client_put(query->sa_query.client);
675 ib_free_send_mad(query->sa_query.mad_buf);
676
677 err1:
678 kfree(query);
679 return ret;
680 }
681 EXPORT_SYMBOL(ib_sa_path_rec_get);
682
683 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query,
684 int status,
685 struct ib_sa_mad *mad)
686 {
687 struct ib_sa_service_query *query =
688 container_of(sa_query, struct ib_sa_service_query, sa_query);
689
690 if (mad) {
691 struct ib_sa_service_rec rec;
692
693 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table),
694 mad->data, &rec);
695 query->callback(status, &rec, query->context);
696 } else
697 query->callback(status, NULL, query->context);
698 }
699
700 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query)
701 {
702 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query));
703 }
704
705 /**
706 * ib_sa_service_rec_query - Start Service Record operation
707 * @client:SA client
708 * @device:device to send request on
709 * @port_num: port number to send request on
710 * @method:SA method - should be get, set, or delete
711 * @rec:Service Record to send in request
712 * @comp_mask:component mask to send in request
713 * @timeout_ms:time to wait for response
714 * @gfp_mask:GFP mask to use for internal allocations
715 * @callback:function called when request completes, times out or is
716 * canceled
717 * @context:opaque user context passed to callback
718 * @sa_query:request context, used to cancel request
719 *
720 * Send a Service Record set/get/delete to the SA to register,
721 * unregister or query a service record.
722 * The callback function will be called when the request completes (or
723 * fails); status is 0 for a successful response, -EINTR if the query
724 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
725 * occurred sending the query. The resp parameter of the callback is
726 * only valid if status is 0.
727 *
728 * If the return value of ib_sa_service_rec_query() is negative, it is an
729 * error code. Otherwise it is a request ID that can be used to cancel
730 * the query.
731 */
732 int ib_sa_service_rec_query(struct ib_sa_client *client,
733 struct ib_device *device, u8 port_num, u8 method,
734 struct ib_sa_service_rec *rec,
735 ib_sa_comp_mask comp_mask,
736 int timeout_ms, gfp_t gfp_mask,
737 void (*callback)(int status,
738 struct ib_sa_service_rec *resp,
739 void *context),
740 void *context,
741 struct ib_sa_query **sa_query)
742 {
743 struct ib_sa_service_query *query;
744 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
745 struct ib_sa_port *port;
746 struct ib_mad_agent *agent;
747 struct ib_sa_mad *mad;
748 int ret;
749
750 if (!sa_dev)
751 return -ENODEV;
752
753 port = &sa_dev->port[port_num - sa_dev->start_port];
754 agent = port->agent;
755
756 if (method != IB_MGMT_METHOD_GET &&
757 method != IB_MGMT_METHOD_SET &&
758 method != IB_SA_METHOD_DELETE)
759 return -EINVAL;
760
761 query = kmalloc(sizeof *query, gfp_mask);
762 if (!query)
763 return -ENOMEM;
764
765 query->sa_query.mad_buf = ib_create_send_mad(agent, 1, 0,
766 0, IB_MGMT_SA_HDR,
767 IB_MGMT_SA_DATA, gfp_mask);
768 if (!query->sa_query.mad_buf) {
769 ret = -ENOMEM;
770 goto err1;
771 }
772
773 ib_sa_client_get(client);
774 query->sa_query.client = client;
775 query->callback = callback;
776 query->context = context;
777
778 mad = query->sa_query.mad_buf->mad;
779 init_mad(mad, agent);
780
781 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
782 query->sa_query.release = ib_sa_service_rec_release;
783 query->sa_query.port = port;
784 mad->mad_hdr.method = method;
785 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
786 mad->sa_hdr.comp_mask = comp_mask;
787
788 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table),
789 rec, mad->data);
790
791 *sa_query = &query->sa_query;
792
793 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
794 if (ret < 0)
795 goto err2;
796
797 return ret;
798
799 err2:
800 *sa_query = NULL;
801 ib_sa_client_put(query->sa_query.client);
802 ib_free_send_mad(query->sa_query.mad_buf);
803
804 err1:
805 kfree(query);
806 return ret;
807 }
808 EXPORT_SYMBOL(ib_sa_service_rec_query);
809
810 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
811 int status,
812 struct ib_sa_mad *mad)
813 {
814 struct ib_sa_mcmember_query *query =
815 container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
816
817 if (mad) {
818 struct ib_sa_mcmember_rec rec;
819
820 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
821 mad->data, &rec);
822 query->callback(status, &rec, query->context);
823 } else
824 query->callback(status, NULL, query->context);
825 }
826
827 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
828 {
829 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
830 }
831
832 int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
833 struct ib_device *device, u8 port_num,
834 u8 method,
835 struct ib_sa_mcmember_rec *rec,
836 ib_sa_comp_mask comp_mask,
837 int timeout_ms, gfp_t gfp_mask,
838 void (*callback)(int status,
839 struct ib_sa_mcmember_rec *resp,
840 void *context),
841 void *context,
842 struct ib_sa_query **sa_query)
843 {
844 struct ib_sa_mcmember_query *query;
845 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
846 struct ib_sa_port *port;
847 struct ib_mad_agent *agent;
848 struct ib_sa_mad *mad;
849 int ret;
850
851 if (!sa_dev)
852 return -ENODEV;
853
854 port = &sa_dev->port[port_num - sa_dev->start_port];
855 agent = port->agent;
856
857 query = kmalloc(sizeof *query, gfp_mask);
858 if (!query)
859 return -ENOMEM;
860
861 query->sa_query.mad_buf = ib_create_send_mad(agent, 1, 0,
862 0, IB_MGMT_SA_HDR,
863 IB_MGMT_SA_DATA, gfp_mask);
864 if (!query->sa_query.mad_buf) {
865 ret = -ENOMEM;
866 goto err1;
867 }
868
869 ib_sa_client_get(client);
870 query->sa_query.client = client;
871 query->callback = callback;
872 query->context = context;
873
874 mad = query->sa_query.mad_buf->mad;
875 init_mad(mad, agent);
876
877 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
878 query->sa_query.release = ib_sa_mcmember_rec_release;
879 query->sa_query.port = port;
880 mad->mad_hdr.method = method;
881 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
882 mad->sa_hdr.comp_mask = comp_mask;
883
884 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
885 rec, mad->data);
886
887 *sa_query = &query->sa_query;
888
889 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
890 if (ret < 0)
891 goto err2;
892
893 return ret;
894
895 err2:
896 *sa_query = NULL;
897 ib_sa_client_put(query->sa_query.client);
898 ib_free_send_mad(query->sa_query.mad_buf);
899
900 err1:
901 kfree(query);
902 return ret;
903 }
904 EXPORT_SYMBOL(ib_sa_mcmember_rec_query);
905
906 static void send_handler(struct ib_mad_agent *agent,
907 struct ib_mad_send_wc *mad_send_wc)
908 {
909 struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
910 unsigned long flags;
911
912 if (query->callback)
913 switch (mad_send_wc->status) {
914 case IB_WC_SUCCESS:
915 /* No callback -- already got recv */
916 break;
917 case IB_WC_RESP_TIMEOUT_ERR:
918 query->callback(query, -ETIMEDOUT, NULL);
919 break;
920 case IB_WC_WR_FLUSH_ERR:
921 query->callback(query, -EINTR, NULL);
922 break;
923 default:
924 query->callback(query, -EIO, NULL);
925 break;
926 }
927
928 spin_lock_irqsave(&idr_lock, flags);
929 idr_remove(&query_idr, query->id);
930 spin_unlock_irqrestore(&idr_lock, flags);
931
932 ib_free_send_mad(mad_send_wc->send_buf);
933 kref_put(&query->sm_ah->ref, free_sm_ah);
934 ib_sa_client_put(query->client);
935 query->release(query);
936 }
937
938 static void recv_handler(struct ib_mad_agent *mad_agent,
939 struct ib_mad_recv_wc *mad_recv_wc)
940 {
941 struct ib_sa_query *query;
942 struct ib_mad_send_buf *mad_buf;
943
944 mad_buf = (void *) (unsigned long) mad_recv_wc->wc->wr_id;
945 query = mad_buf->context[0];
946
947 if (query->callback) {
948 if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
949 query->callback(query,
950 mad_recv_wc->recv_buf.mad->mad_hdr.status ?
951 -EINVAL : 0,
952 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
953 else
954 query->callback(query, -EIO, NULL);
955 }
956
957 ib_free_recv_mad(mad_recv_wc);
958 }
959
960 static void ib_sa_add_one(struct ib_device *device)
961 {
962 struct ib_sa_device *sa_dev;
963 int s, e, i;
964
965 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
966 return;
967
968 if (device->node_type == RDMA_NODE_IB_SWITCH)
969 s = e = 0;
970 else {
971 s = 1;
972 e = device->phys_port_cnt;
973 }
974
975 sa_dev = kmalloc(sizeof *sa_dev +
976 (e - s + 1) * sizeof (struct ib_sa_port),
977 GFP_KERNEL);
978 if (!sa_dev)
979 return;
980
981 sa_dev->start_port = s;
982 sa_dev->end_port = e;
983
984 for (i = 0; i <= e - s; ++i) {
985 sa_dev->port[i].sm_ah = NULL;
986 sa_dev->port[i].port_num = i + s;
987 spin_lock_init(&sa_dev->port[i].ah_lock);
988
989 sa_dev->port[i].agent =
990 ib_register_mad_agent(device, i + s, IB_QPT_GSI,
991 NULL, 0, send_handler,
992 recv_handler, sa_dev);
993 if (IS_ERR(sa_dev->port[i].agent))
994 goto err;
995
996 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah);
997 }
998
999 ib_set_client_data(device, &sa_client, sa_dev);
1000
1001 /*
1002 * We register our event handler after everything is set up,
1003 * and then update our cached info after the event handler is
1004 * registered to avoid any problems if a port changes state
1005 * during our initialization.
1006 */
1007
1008 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
1009 if (ib_register_event_handler(&sa_dev->event_handler))
1010 goto err;
1011
1012 for (i = 0; i <= e - s; ++i)
1013 update_sm_ah(&sa_dev->port[i].update_task);
1014
1015 return;
1016
1017 err:
1018 while (--i >= 0)
1019 ib_unregister_mad_agent(sa_dev->port[i].agent);
1020
1021 kfree(sa_dev);
1022
1023 return;
1024 }
1025
1026 static void ib_sa_remove_one(struct ib_device *device)
1027 {
1028 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1029 int i;
1030
1031 if (!sa_dev)
1032 return;
1033
1034 ib_unregister_event_handler(&sa_dev->event_handler);
1035
1036 flush_scheduled_work();
1037
1038 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
1039 ib_unregister_mad_agent(sa_dev->port[i].agent);
1040 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
1041 }
1042
1043 kfree(sa_dev);
1044 }
1045
1046 static int __init ib_sa_init(void)
1047 {
1048 int ret;
1049
1050 spin_lock_init(&idr_lock);
1051 spin_lock_init(&tid_lock);
1052
1053 get_random_bytes(&tid, sizeof tid);
1054
1055 ret = ib_register_client(&sa_client);
1056 if (ret)
1057 printk(KERN_ERR "Couldn't register ib_sa client\n");
1058
1059 return ret;
1060 }
1061
1062 static void __exit ib_sa_cleanup(void)
1063 {
1064 ib_unregister_client(&sa_client);
1065 idr_destroy(&query_idr);
1066 }
1067
1068 module_init(ib_sa_init);
1069 module_exit(ib_sa_cleanup);
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