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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[deliverable/linux.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(void *port_ptr)
364 {
365 struct ib_sa_port *port = port_ptr;
366 struct ib_sa_sm_ah *new_ah, *old_ah;
367 struct ib_port_attr port_attr;
368 struct ib_ah_attr ah_attr;
369
370 if (ib_query_port(port->agent->device, port->port_num, &port_attr)) {
371 printk(KERN_WARNING "Couldn't query port\n");
372 return;
373 }
374
375 new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL);
376 if (!new_ah) {
377 printk(KERN_WARNING "Couldn't allocate new SM AH\n");
378 return;
379 }
380
381 kref_init(&new_ah->ref);
382
383 memset(&ah_attr, 0, sizeof ah_attr);
384 ah_attr.dlid = port_attr.sm_lid;
385 ah_attr.sl = port_attr.sm_sl;
386 ah_attr.port_num = port->port_num;
387
388 new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr);
389 if (IS_ERR(new_ah->ah)) {
390 printk(KERN_WARNING "Couldn't create new SM AH\n");
391 kfree(new_ah);
392 return;
393 }
394
395 spin_lock_irq(&port->ah_lock);
396 old_ah = port->sm_ah;
397 port->sm_ah = new_ah;
398 spin_unlock_irq(&port->ah_lock);
399
400 if (old_ah)
401 kref_put(&old_ah->ref, free_sm_ah);
402 }
403
404 static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event)
405 {
406 if (event->event == IB_EVENT_PORT_ERR ||
407 event->event == IB_EVENT_PORT_ACTIVE ||
408 event->event == IB_EVENT_LID_CHANGE ||
409 event->event == IB_EVENT_PKEY_CHANGE ||
410 event->event == IB_EVENT_SM_CHANGE ||
411 event->event == IB_EVENT_CLIENT_REREGISTER) {
412 struct ib_sa_device *sa_dev;
413 sa_dev = container_of(handler, typeof(*sa_dev), event_handler);
414
415 schedule_work(&sa_dev->port[event->element.port_num -
416 sa_dev->start_port].update_task);
417 }
418 }
419
420 void ib_sa_register_client(struct ib_sa_client *client)
421 {
422 atomic_set(&client->users, 1);
423 init_completion(&client->comp);
424 }
425 EXPORT_SYMBOL(ib_sa_register_client);
426
427 static inline void ib_sa_client_get(struct ib_sa_client *client)
428 {
429 atomic_inc(&client->users);
430 }
431
432 static inline void ib_sa_client_put(struct ib_sa_client *client)
433 {
434 if (atomic_dec_and_test(&client->users))
435 complete(&client->comp);
436 }
437
438 void ib_sa_unregister_client(struct ib_sa_client *client)
439 {
440 ib_sa_client_put(client);
441 wait_for_completion(&client->comp);
442 }
443 EXPORT_SYMBOL(ib_sa_unregister_client);
444
445 /**
446 * ib_sa_cancel_query - try to cancel an SA query
447 * @id:ID of query to cancel
448 * @query:query pointer to cancel
449 *
450 * Try to cancel an SA query. If the id and query don't match up or
451 * the query has already completed, nothing is done. Otherwise the
452 * query is canceled and will complete with a status of -EINTR.
453 */
454 void ib_sa_cancel_query(int id, struct ib_sa_query *query)
455 {
456 unsigned long flags;
457 struct ib_mad_agent *agent;
458 struct ib_mad_send_buf *mad_buf;
459
460 spin_lock_irqsave(&idr_lock, flags);
461 if (idr_find(&query_idr, id) != query) {
462 spin_unlock_irqrestore(&idr_lock, flags);
463 return;
464 }
465 agent = query->port->agent;
466 mad_buf = query->mad_buf;
467 spin_unlock_irqrestore(&idr_lock, flags);
468
469 ib_cancel_mad(agent, mad_buf);
470 }
471 EXPORT_SYMBOL(ib_sa_cancel_query);
472
473 int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
474 struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr)
475 {
476 int ret;
477 u16 gid_index;
478
479 memset(ah_attr, 0, sizeof *ah_attr);
480 ah_attr->dlid = be16_to_cpu(rec->dlid);
481 ah_attr->sl = rec->sl;
482 ah_attr->src_path_bits = be16_to_cpu(rec->slid) & 0x7f;
483 ah_attr->port_num = port_num;
484
485 if (rec->hop_limit > 1) {
486 ah_attr->ah_flags = IB_AH_GRH;
487 ah_attr->grh.dgid = rec->dgid;
488
489 ret = ib_find_cached_gid(device, &rec->sgid, &port_num,
490 &gid_index);
491 if (ret)
492 return ret;
493
494 ah_attr->grh.sgid_index = gid_index;
495 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
496 ah_attr->grh.hop_limit = rec->hop_limit;
497 ah_attr->grh.traffic_class = rec->traffic_class;
498 }
499 return 0;
500 }
501 EXPORT_SYMBOL(ib_init_ah_from_path);
502
503 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
504 {
505 unsigned long flags;
506
507 memset(mad, 0, sizeof *mad);
508
509 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION;
510 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
511 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
512
513 spin_lock_irqsave(&tid_lock, flags);
514 mad->mad_hdr.tid =
515 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
516 spin_unlock_irqrestore(&tid_lock, flags);
517 }
518
519 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask)
520 {
521 unsigned long flags;
522 int ret, id;
523
524 retry:
525 if (!idr_pre_get(&query_idr, gfp_mask))
526 return -ENOMEM;
527 spin_lock_irqsave(&idr_lock, flags);
528 ret = idr_get_new(&query_idr, query, &id);
529 spin_unlock_irqrestore(&idr_lock, flags);
530 if (ret == -EAGAIN)
531 goto retry;
532 if (ret)
533 return ret;
534
535 query->mad_buf->timeout_ms = timeout_ms;
536 query->mad_buf->context[0] = query;
537 query->id = id;
538
539 spin_lock_irqsave(&query->port->ah_lock, flags);
540 kref_get(&query->port->sm_ah->ref);
541 query->sm_ah = query->port->sm_ah;
542 spin_unlock_irqrestore(&query->port->ah_lock, flags);
543
544 query->mad_buf->ah = query->sm_ah->ah;
545
546 ret = ib_post_send_mad(query->mad_buf, NULL);
547 if (ret) {
548 spin_lock_irqsave(&idr_lock, flags);
549 idr_remove(&query_idr, id);
550 spin_unlock_irqrestore(&idr_lock, flags);
551
552 kref_put(&query->sm_ah->ref, free_sm_ah);
553 }
554
555 /*
556 * It's not safe to dereference query any more, because the
557 * send may already have completed and freed the query in
558 * another context.
559 */
560 return ret ? ret : id;
561 }
562
563 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
564 int status,
565 struct ib_sa_mad *mad)
566 {
567 struct ib_sa_path_query *query =
568 container_of(sa_query, struct ib_sa_path_query, sa_query);
569
570 if (mad) {
571 struct ib_sa_path_rec rec;
572
573 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
574 mad->data, &rec);
575 query->callback(status, &rec, query->context);
576 } else
577 query->callback(status, NULL, query->context);
578 }
579
580 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
581 {
582 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query));
583 }
584
585 /**
586 * ib_sa_path_rec_get - Start a Path get query
587 * @client:SA client
588 * @device:device to send query on
589 * @port_num: port number to send query on
590 * @rec:Path Record to send in query
591 * @comp_mask:component mask to send in query
592 * @timeout_ms:time to wait for response
593 * @gfp_mask:GFP mask to use for internal allocations
594 * @callback:function called when query completes, times out or is
595 * canceled
596 * @context:opaque user context passed to callback
597 * @sa_query:query context, used to cancel query
598 *
599 * Send a Path Record Get query to the SA to look up a path. The
600 * callback function will be called when the query completes (or
601 * fails); status is 0 for a successful response, -EINTR if the query
602 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
603 * occurred sending the query. The resp parameter of the callback is
604 * only valid if status is 0.
605 *
606 * If the return value of ib_sa_path_rec_get() is negative, it is an
607 * error code. Otherwise it is a query ID that can be used to cancel
608 * the query.
609 */
610 int ib_sa_path_rec_get(struct ib_sa_client *client,
611 struct ib_device *device, u8 port_num,
612 struct ib_sa_path_rec *rec,
613 ib_sa_comp_mask comp_mask,
614 int timeout_ms, gfp_t gfp_mask,
615 void (*callback)(int status,
616 struct ib_sa_path_rec *resp,
617 void *context),
618 void *context,
619 struct ib_sa_query **sa_query)
620 {
621 struct ib_sa_path_query *query;
622 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
623 struct ib_sa_port *port;
624 struct ib_mad_agent *agent;
625 struct ib_sa_mad *mad;
626 int ret;
627
628 if (!sa_dev)
629 return -ENODEV;
630
631 port = &sa_dev->port[port_num - sa_dev->start_port];
632 agent = port->agent;
633
634 query = kmalloc(sizeof *query, gfp_mask);
635 if (!query)
636 return -ENOMEM;
637
638 query->sa_query.mad_buf = ib_create_send_mad(agent, 1, 0,
639 0, IB_MGMT_SA_HDR,
640 IB_MGMT_SA_DATA, gfp_mask);
641 if (!query->sa_query.mad_buf) {
642 ret = -ENOMEM;
643 goto err1;
644 }
645
646 ib_sa_client_get(client);
647 query->sa_query.client = client;
648 query->callback = callback;
649 query->context = context;
650
651 mad = query->sa_query.mad_buf->mad;
652 init_mad(mad, agent);
653
654 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
655 query->sa_query.release = ib_sa_path_rec_release;
656 query->sa_query.port = port;
657 mad->mad_hdr.method = IB_MGMT_METHOD_GET;
658 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC);
659 mad->sa_hdr.comp_mask = comp_mask;
660
661 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data);
662
663 *sa_query = &query->sa_query;
664
665 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
666 if (ret < 0)
667 goto err2;
668
669 return ret;
670
671 err2:
672 *sa_query = NULL;
673 ib_sa_client_put(query->sa_query.client);
674 ib_free_send_mad(query->sa_query.mad_buf);
675
676 err1:
677 kfree(query);
678 return ret;
679 }
680 EXPORT_SYMBOL(ib_sa_path_rec_get);
681
682 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query,
683 int status,
684 struct ib_sa_mad *mad)
685 {
686 struct ib_sa_service_query *query =
687 container_of(sa_query, struct ib_sa_service_query, sa_query);
688
689 if (mad) {
690 struct ib_sa_service_rec rec;
691
692 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table),
693 mad->data, &rec);
694 query->callback(status, &rec, query->context);
695 } else
696 query->callback(status, NULL, query->context);
697 }
698
699 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query)
700 {
701 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query));
702 }
703
704 /**
705 * ib_sa_service_rec_query - Start Service Record operation
706 * @client:SA client
707 * @device:device to send request on
708 * @port_num: port number to send request on
709 * @method:SA method - should be get, set, or delete
710 * @rec:Service Record to send in request
711 * @comp_mask:component mask to send in request
712 * @timeout_ms:time to wait for response
713 * @gfp_mask:GFP mask to use for internal allocations
714 * @callback:function called when request completes, times out or is
715 * canceled
716 * @context:opaque user context passed to callback
717 * @sa_query:request context, used to cancel request
718 *
719 * Send a Service Record set/get/delete to the SA to register,
720 * unregister or query a service record.
721 * The callback function will be called when the request completes (or
722 * fails); status is 0 for a successful response, -EINTR if the query
723 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
724 * occurred sending the query. The resp parameter of the callback is
725 * only valid if status is 0.
726 *
727 * If the return value of ib_sa_service_rec_query() is negative, it is an
728 * error code. Otherwise it is a request ID that can be used to cancel
729 * the query.
730 */
731 int ib_sa_service_rec_query(struct ib_sa_client *client,
732 struct ib_device *device, u8 port_num, u8 method,
733 struct ib_sa_service_rec *rec,
734 ib_sa_comp_mask comp_mask,
735 int timeout_ms, gfp_t gfp_mask,
736 void (*callback)(int status,
737 struct ib_sa_service_rec *resp,
738 void *context),
739 void *context,
740 struct ib_sa_query **sa_query)
741 {
742 struct ib_sa_service_query *query;
743 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
744 struct ib_sa_port *port;
745 struct ib_mad_agent *agent;
746 struct ib_sa_mad *mad;
747 int ret;
748
749 if (!sa_dev)
750 return -ENODEV;
751
752 port = &sa_dev->port[port_num - sa_dev->start_port];
753 agent = port->agent;
754
755 if (method != IB_MGMT_METHOD_GET &&
756 method != IB_MGMT_METHOD_SET &&
757 method != IB_SA_METHOD_DELETE)
758 return -EINVAL;
759
760 query = kmalloc(sizeof *query, gfp_mask);
761 if (!query)
762 return -ENOMEM;
763
764 query->sa_query.mad_buf = ib_create_send_mad(agent, 1, 0,
765 0, IB_MGMT_SA_HDR,
766 IB_MGMT_SA_DATA, gfp_mask);
767 if (!query->sa_query.mad_buf) {
768 ret = -ENOMEM;
769 goto err1;
770 }
771
772 ib_sa_client_get(client);
773 query->sa_query.client = client;
774 query->callback = callback;
775 query->context = context;
776
777 mad = query->sa_query.mad_buf->mad;
778 init_mad(mad, agent);
779
780 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
781 query->sa_query.release = ib_sa_service_rec_release;
782 query->sa_query.port = port;
783 mad->mad_hdr.method = method;
784 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
785 mad->sa_hdr.comp_mask = comp_mask;
786
787 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table),
788 rec, mad->data);
789
790 *sa_query = &query->sa_query;
791
792 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
793 if (ret < 0)
794 goto err2;
795
796 return ret;
797
798 err2:
799 *sa_query = NULL;
800 ib_sa_client_put(query->sa_query.client);
801 ib_free_send_mad(query->sa_query.mad_buf);
802
803 err1:
804 kfree(query);
805 return ret;
806 }
807 EXPORT_SYMBOL(ib_sa_service_rec_query);
808
809 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
810 int status,
811 struct ib_sa_mad *mad)
812 {
813 struct ib_sa_mcmember_query *query =
814 container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
815
816 if (mad) {
817 struct ib_sa_mcmember_rec rec;
818
819 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
820 mad->data, &rec);
821 query->callback(status, &rec, query->context);
822 } else
823 query->callback(status, NULL, query->context);
824 }
825
826 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
827 {
828 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
829 }
830
831 int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
832 struct ib_device *device, u8 port_num,
833 u8 method,
834 struct ib_sa_mcmember_rec *rec,
835 ib_sa_comp_mask comp_mask,
836 int timeout_ms, gfp_t gfp_mask,
837 void (*callback)(int status,
838 struct ib_sa_mcmember_rec *resp,
839 void *context),
840 void *context,
841 struct ib_sa_query **sa_query)
842 {
843 struct ib_sa_mcmember_query *query;
844 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
845 struct ib_sa_port *port;
846 struct ib_mad_agent *agent;
847 struct ib_sa_mad *mad;
848 int ret;
849
850 if (!sa_dev)
851 return -ENODEV;
852
853 port = &sa_dev->port[port_num - sa_dev->start_port];
854 agent = port->agent;
855
856 query = kmalloc(sizeof *query, gfp_mask);
857 if (!query)
858 return -ENOMEM;
859
860 query->sa_query.mad_buf = ib_create_send_mad(agent, 1, 0,
861 0, IB_MGMT_SA_HDR,
862 IB_MGMT_SA_DATA, gfp_mask);
863 if (!query->sa_query.mad_buf) {
864 ret = -ENOMEM;
865 goto err1;
866 }
867
868 ib_sa_client_get(client);
869 query->sa_query.client = client;
870 query->callback = callback;
871 query->context = context;
872
873 mad = query->sa_query.mad_buf->mad;
874 init_mad(mad, agent);
875
876 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
877 query->sa_query.release = ib_sa_mcmember_rec_release;
878 query->sa_query.port = port;
879 mad->mad_hdr.method = method;
880 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
881 mad->sa_hdr.comp_mask = comp_mask;
882
883 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
884 rec, mad->data);
885
886 *sa_query = &query->sa_query;
887
888 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
889 if (ret < 0)
890 goto err2;
891
892 return ret;
893
894 err2:
895 *sa_query = NULL;
896 ib_sa_client_put(query->sa_query.client);
897 ib_free_send_mad(query->sa_query.mad_buf);
898
899 err1:
900 kfree(query);
901 return ret;
902 }
903 EXPORT_SYMBOL(ib_sa_mcmember_rec_query);
904
905 static void send_handler(struct ib_mad_agent *agent,
906 struct ib_mad_send_wc *mad_send_wc)
907 {
908 struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
909 unsigned long flags;
910
911 if (query->callback)
912 switch (mad_send_wc->status) {
913 case IB_WC_SUCCESS:
914 /* No callback -- already got recv */
915 break;
916 case IB_WC_RESP_TIMEOUT_ERR:
917 query->callback(query, -ETIMEDOUT, NULL);
918 break;
919 case IB_WC_WR_FLUSH_ERR:
920 query->callback(query, -EINTR, NULL);
921 break;
922 default:
923 query->callback(query, -EIO, NULL);
924 break;
925 }
926
927 spin_lock_irqsave(&idr_lock, flags);
928 idr_remove(&query_idr, query->id);
929 spin_unlock_irqrestore(&idr_lock, flags);
930
931 ib_free_send_mad(mad_send_wc->send_buf);
932 kref_put(&query->sm_ah->ref, free_sm_ah);
933 ib_sa_client_put(query->client);
934 query->release(query);
935 }
936
937 static void recv_handler(struct ib_mad_agent *mad_agent,
938 struct ib_mad_recv_wc *mad_recv_wc)
939 {
940 struct ib_sa_query *query;
941 struct ib_mad_send_buf *mad_buf;
942
943 mad_buf = (void *) (unsigned long) mad_recv_wc->wc->wr_id;
944 query = mad_buf->context[0];
945
946 if (query->callback) {
947 if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
948 query->callback(query,
949 mad_recv_wc->recv_buf.mad->mad_hdr.status ?
950 -EINVAL : 0,
951 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
952 else
953 query->callback(query, -EIO, NULL);
954 }
955
956 ib_free_recv_mad(mad_recv_wc);
957 }
958
959 static void ib_sa_add_one(struct ib_device *device)
960 {
961 struct ib_sa_device *sa_dev;
962 int s, e, i;
963
964 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
965 return;
966
967 if (device->node_type == RDMA_NODE_IB_SWITCH)
968 s = e = 0;
969 else {
970 s = 1;
971 e = device->phys_port_cnt;
972 }
973
974 sa_dev = kmalloc(sizeof *sa_dev +
975 (e - s + 1) * sizeof (struct ib_sa_port),
976 GFP_KERNEL);
977 if (!sa_dev)
978 return;
979
980 sa_dev->start_port = s;
981 sa_dev->end_port = e;
982
983 for (i = 0; i <= e - s; ++i) {
984 sa_dev->port[i].sm_ah = NULL;
985 sa_dev->port[i].port_num = i + s;
986 spin_lock_init(&sa_dev->port[i].ah_lock);
987
988 sa_dev->port[i].agent =
989 ib_register_mad_agent(device, i + s, IB_QPT_GSI,
990 NULL, 0, send_handler,
991 recv_handler, sa_dev);
992 if (IS_ERR(sa_dev->port[i].agent))
993 goto err;
994
995 INIT_WORK(&sa_dev->port[i].update_task,
996 update_sm_ah, &sa_dev->port[i]);
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]);
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);
Linux kernel - Deliverables
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