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Linux 2.6.21
[linux/fpc-iii.git] / drivers / infiniband / core / sa_query.c
blob68db633711c5dfd58711c9018ea11d599a9cc3c0
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_cache.h>
51 #include "sa.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 void ib_sa_unregister_client(struct ib_sa_client *client)
429 {
430 ib_sa_client_put(client);
431 wait_for_completion(&client->comp);
432 }
433 EXPORT_SYMBOL(ib_sa_unregister_client);
434
435 /**
436 * ib_sa_cancel_query - try to cancel an SA query
437 * @id:ID of query to cancel
438 * @query:query pointer to cancel
439 *
440 * Try to cancel an SA query. If the id and query don't match up or
441 * the query has already completed, nothing is done. Otherwise the
442 * query is canceled and will complete with a status of -EINTR.
443 */
444 void ib_sa_cancel_query(int id, struct ib_sa_query *query)
445 {
446 unsigned long flags;
447 struct ib_mad_agent *agent;
448 struct ib_mad_send_buf *mad_buf;
449
450 spin_lock_irqsave(&idr_lock, flags);
451 if (idr_find(&query_idr, id) != query) {
452 spin_unlock_irqrestore(&idr_lock, flags);
453 return;
454 }
455 agent = query->port->agent;
456 mad_buf = query->mad_buf;
457 spin_unlock_irqrestore(&idr_lock, flags);
458
459 ib_cancel_mad(agent, mad_buf);
460 }
461 EXPORT_SYMBOL(ib_sa_cancel_query);
462
463 int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
464 struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr)
465 {
466 int ret;
467 u16 gid_index;
468
469 memset(ah_attr, 0, sizeof *ah_attr);
470 ah_attr->dlid = be16_to_cpu(rec->dlid);
471 ah_attr->sl = rec->sl;
472 ah_attr->src_path_bits = be16_to_cpu(rec->slid) & 0x7f;
473 ah_attr->port_num = port_num;
474 ah_attr->static_rate = rec->rate;
475
476 if (rec->hop_limit > 1) {
477 ah_attr->ah_flags = IB_AH_GRH;
478 ah_attr->grh.dgid = rec->dgid;
479
480 ret = ib_find_cached_gid(device, &rec->sgid, &port_num,
481 &gid_index);
482 if (ret)
483 return ret;
484
485 ah_attr->grh.sgid_index = gid_index;
486 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
487 ah_attr->grh.hop_limit = rec->hop_limit;
488 ah_attr->grh.traffic_class = rec->traffic_class;
489 }
490 return 0;
491 }
492 EXPORT_SYMBOL(ib_init_ah_from_path);
493
494 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
495 {
496 unsigned long flags;
497
498 memset(mad, 0, sizeof *mad);
499
500 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION;
501 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
502 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
503
504 spin_lock_irqsave(&tid_lock, flags);
505 mad->mad_hdr.tid =
506 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
507 spin_unlock_irqrestore(&tid_lock, flags);
508 }
509
510 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask)
511 {
512 unsigned long flags;
513 int ret, id;
514
515 retry:
516 if (!idr_pre_get(&query_idr, gfp_mask))
517 return -ENOMEM;
518 spin_lock_irqsave(&idr_lock, flags);
519 ret = idr_get_new(&query_idr, query, &id);
520 spin_unlock_irqrestore(&idr_lock, flags);
521 if (ret == -EAGAIN)
522 goto retry;
523 if (ret)
524 return ret;
525
526 query->mad_buf->timeout_ms = timeout_ms;
527 query->mad_buf->context[0] = query;
528 query->id = id;
529
530 spin_lock_irqsave(&query->port->ah_lock, flags);
531 kref_get(&query->port->sm_ah->ref);
532 query->sm_ah = query->port->sm_ah;
533 spin_unlock_irqrestore(&query->port->ah_lock, flags);
534
535 query->mad_buf->ah = query->sm_ah->ah;
536
537 ret = ib_post_send_mad(query->mad_buf, NULL);
538 if (ret) {
539 spin_lock_irqsave(&idr_lock, flags);
540 idr_remove(&query_idr, id);
541 spin_unlock_irqrestore(&idr_lock, flags);
542
543 kref_put(&query->sm_ah->ref, free_sm_ah);
544 }
545
546 /*
547 * It's not safe to dereference query any more, because the
548 * send may already have completed and freed the query in
549 * another context.
550 */
551 return ret ? ret : id;
552 }
553
554 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
555 int status,
556 struct ib_sa_mad *mad)
557 {
558 struct ib_sa_path_query *query =
559 container_of(sa_query, struct ib_sa_path_query, sa_query);
560
561 if (mad) {
562 struct ib_sa_path_rec rec;
563
564 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
565 mad->data, &rec);
566 query->callback(status, &rec, query->context);
567 } else
568 query->callback(status, NULL, query->context);
569 }
570
571 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
572 {
573 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query));
574 }
575
576 /**
577 * ib_sa_path_rec_get - Start a Path get query
578 * @client:SA client
579 * @device:device to send query on
580 * @port_num: port number to send query on
581 * @rec:Path Record to send in query
582 * @comp_mask:component mask to send in query
583 * @timeout_ms:time to wait for response
584 * @gfp_mask:GFP mask to use for internal allocations
585 * @callback:function called when query completes, times out or is
586 * canceled
587 * @context:opaque user context passed to callback
588 * @sa_query:query context, used to cancel query
589 *
590 * Send a Path Record Get query to the SA to look up a path. The
591 * callback function will be called when the query completes (or
592 * fails); status is 0 for a successful response, -EINTR if the query
593 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
594 * occurred sending the query. The resp parameter of the callback is
595 * only valid if status is 0.
596 *
597 * If the return value of ib_sa_path_rec_get() is negative, it is an
598 * error code. Otherwise it is a query ID that can be used to cancel
599 * the query.
600 */
601 int ib_sa_path_rec_get(struct ib_sa_client *client,
602 struct ib_device *device, u8 port_num,
603 struct ib_sa_path_rec *rec,
604 ib_sa_comp_mask comp_mask,
605 int timeout_ms, gfp_t gfp_mask,
606 void (*callback)(int status,
607 struct ib_sa_path_rec *resp,
608 void *context),
609 void *context,
610 struct ib_sa_query **sa_query)
611 {
612 struct ib_sa_path_query *query;
613 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
614 struct ib_sa_port *port;
615 struct ib_mad_agent *agent;
616 struct ib_sa_mad *mad;
617 int ret;
618
619 if (!sa_dev)
620 return -ENODEV;
621
622 port = &sa_dev->port[port_num - sa_dev->start_port];
623 agent = port->agent;
624
625 query = kmalloc(sizeof *query, gfp_mask);
626 if (!query)
627 return -ENOMEM;
628
629 query->sa_query.mad_buf = ib_create_send_mad(agent, 1, 0,
630 0, IB_MGMT_SA_HDR,
631 IB_MGMT_SA_DATA, gfp_mask);
632 if (!query->sa_query.mad_buf) {
633 ret = -ENOMEM;
634 goto err1;
635 }
636
637 ib_sa_client_get(client);
638 query->sa_query.client = client;
639 query->callback = callback;
640 query->context = context;
641
642 mad = query->sa_query.mad_buf->mad;
643 init_mad(mad, agent);
644
645 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
646 query->sa_query.release = ib_sa_path_rec_release;
647 query->sa_query.port = port;
648 mad->mad_hdr.method = IB_MGMT_METHOD_GET;
649 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC);
650 mad->sa_hdr.comp_mask = comp_mask;
651
652 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data);
653
654 *sa_query = &query->sa_query;
655
656 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
657 if (ret < 0)
658 goto err2;
659
660 return ret;
661
662 err2:
663 *sa_query = NULL;
664 ib_sa_client_put(query->sa_query.client);
665 ib_free_send_mad(query->sa_query.mad_buf);
666
667 err1:
668 kfree(query);
669 return ret;
670 }
671 EXPORT_SYMBOL(ib_sa_path_rec_get);
672
673 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query,
674 int status,
675 struct ib_sa_mad *mad)
676 {
677 struct ib_sa_service_query *query =
678 container_of(sa_query, struct ib_sa_service_query, sa_query);
679
680 if (mad) {
681 struct ib_sa_service_rec rec;
682
683 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table),
684 mad->data, &rec);
685 query->callback(status, &rec, query->context);
686 } else
687 query->callback(status, NULL, query->context);
688 }
689
690 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query)
691 {
692 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query));
693 }
694
695 /**
696 * ib_sa_service_rec_query - Start Service Record operation
697 * @client:SA client
698 * @device:device to send request on
699 * @port_num: port number to send request on
700 * @method:SA method - should be get, set, or delete
701 * @rec:Service Record to send in request
702 * @comp_mask:component mask to send in request
703 * @timeout_ms:time to wait for response
704 * @gfp_mask:GFP mask to use for internal allocations
705 * @callback:function called when request completes, times out or is
706 * canceled
707 * @context:opaque user context passed to callback
708 * @sa_query:request context, used to cancel request
709 *
710 * Send a Service Record set/get/delete to the SA to register,
711 * unregister or query a service record.
712 * The callback function will be called when the request completes (or
713 * fails); status is 0 for a successful response, -EINTR if the query
714 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
715 * occurred sending the query. The resp parameter of the callback is
716 * only valid if status is 0.
717 *
718 * If the return value of ib_sa_service_rec_query() is negative, it is an
719 * error code. Otherwise it is a request ID that can be used to cancel
720 * the query.
721 */
722 int ib_sa_service_rec_query(struct ib_sa_client *client,
723 struct ib_device *device, u8 port_num, u8 method,
724 struct ib_sa_service_rec *rec,
725 ib_sa_comp_mask comp_mask,
726 int timeout_ms, gfp_t gfp_mask,
727 void (*callback)(int status,
728 struct ib_sa_service_rec *resp,
729 void *context),
730 void *context,
731 struct ib_sa_query **sa_query)
732 {
733 struct ib_sa_service_query *query;
734 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
735 struct ib_sa_port *port;
736 struct ib_mad_agent *agent;
737 struct ib_sa_mad *mad;
738 int ret;
739
740 if (!sa_dev)
741 return -ENODEV;
742
743 port = &sa_dev->port[port_num - sa_dev->start_port];
744 agent = port->agent;
745
746 if (method != IB_MGMT_METHOD_GET &&
747 method != IB_MGMT_METHOD_SET &&
748 method != IB_SA_METHOD_DELETE)
749 return -EINVAL;
750
751 query = kmalloc(sizeof *query, gfp_mask);
752 if (!query)
753 return -ENOMEM;
754
755 query->sa_query.mad_buf = ib_create_send_mad(agent, 1, 0,
756 0, IB_MGMT_SA_HDR,
757 IB_MGMT_SA_DATA, gfp_mask);
758 if (!query->sa_query.mad_buf) {
759 ret = -ENOMEM;
760 goto err1;
761 }
762
763 ib_sa_client_get(client);
764 query->sa_query.client = client;
765 query->callback = callback;
766 query->context = context;
767
768 mad = query->sa_query.mad_buf->mad;
769 init_mad(mad, agent);
770
771 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
772 query->sa_query.release = ib_sa_service_rec_release;
773 query->sa_query.port = port;
774 mad->mad_hdr.method = method;
775 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
776 mad->sa_hdr.comp_mask = comp_mask;
777
778 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table),
779 rec, mad->data);
780
781 *sa_query = &query->sa_query;
782
783 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
784 if (ret < 0)
785 goto err2;
786
787 return ret;
788
789 err2:
790 *sa_query = NULL;
791 ib_sa_client_put(query->sa_query.client);
792 ib_free_send_mad(query->sa_query.mad_buf);
793
794 err1:
795 kfree(query);
796 return ret;
797 }
798 EXPORT_SYMBOL(ib_sa_service_rec_query);
799
800 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
801 int status,
802 struct ib_sa_mad *mad)
803 {
804 struct ib_sa_mcmember_query *query =
805 container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
806
807 if (mad) {
808 struct ib_sa_mcmember_rec rec;
809
810 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
811 mad->data, &rec);
812 query->callback(status, &rec, query->context);
813 } else
814 query->callback(status, NULL, query->context);
815 }
816
817 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
818 {
819 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
820 }
821
822 int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
823 struct ib_device *device, u8 port_num,
824 u8 method,
825 struct ib_sa_mcmember_rec *rec,
826 ib_sa_comp_mask comp_mask,
827 int timeout_ms, gfp_t gfp_mask,
828 void (*callback)(int status,
829 struct ib_sa_mcmember_rec *resp,
830 void *context),
831 void *context,
832 struct ib_sa_query **sa_query)
833 {
834 struct ib_sa_mcmember_query *query;
835 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
836 struct ib_sa_port *port;
837 struct ib_mad_agent *agent;
838 struct ib_sa_mad *mad;
839 int ret;
840
841 if (!sa_dev)
842 return -ENODEV;
843
844 port = &sa_dev->port[port_num - sa_dev->start_port];
845 agent = port->agent;
846
847 query = kmalloc(sizeof *query, gfp_mask);
848 if (!query)
849 return -ENOMEM;
850
851 query->sa_query.mad_buf = ib_create_send_mad(agent, 1, 0,
852 0, IB_MGMT_SA_HDR,
853 IB_MGMT_SA_DATA, gfp_mask);
854 if (!query->sa_query.mad_buf) {
855 ret = -ENOMEM;
856 goto err1;
857 }
858
859 ib_sa_client_get(client);
860 query->sa_query.client = client;
861 query->callback = callback;
862 query->context = context;
863
864 mad = query->sa_query.mad_buf->mad;
865 init_mad(mad, agent);
866
867 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
868 query->sa_query.release = ib_sa_mcmember_rec_release;
869 query->sa_query.port = port;
870 mad->mad_hdr.method = method;
871 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
872 mad->sa_hdr.comp_mask = comp_mask;
873
874 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
875 rec, mad->data);
876
877 *sa_query = &query->sa_query;
878
879 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
880 if (ret < 0)
881 goto err2;
882
883 return ret;
884
885 err2:
886 *sa_query = NULL;
887 ib_sa_client_put(query->sa_query.client);
888 ib_free_send_mad(query->sa_query.mad_buf);
889
890 err1:
891 kfree(query);
892 return ret;
893 }
894
895 static void send_handler(struct ib_mad_agent *agent,
896 struct ib_mad_send_wc *mad_send_wc)
897 {
898 struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
899 unsigned long flags;
900
901 if (query->callback)
902 switch (mad_send_wc->status) {
903 case IB_WC_SUCCESS:
904 /* No callback -- already got recv */
905 break;
906 case IB_WC_RESP_TIMEOUT_ERR:
907 query->callback(query, -ETIMEDOUT, NULL);
908 break;
909 case IB_WC_WR_FLUSH_ERR:
910 query->callback(query, -EINTR, NULL);
911 break;
912 default:
913 query->callback(query, -EIO, NULL);
914 break;
915 }
916
917 spin_lock_irqsave(&idr_lock, flags);
918 idr_remove(&query_idr, query->id);
919 spin_unlock_irqrestore(&idr_lock, flags);
920
921 ib_free_send_mad(mad_send_wc->send_buf);
922 kref_put(&query->sm_ah->ref, free_sm_ah);
923 ib_sa_client_put(query->client);
924 query->release(query);
925 }
926
927 static void recv_handler(struct ib_mad_agent *mad_agent,
928 struct ib_mad_recv_wc *mad_recv_wc)
929 {
930 struct ib_sa_query *query;
931 struct ib_mad_send_buf *mad_buf;
932
933 mad_buf = (void *) (unsigned long) mad_recv_wc->wc->wr_id;
934 query = mad_buf->context[0];
935
936 if (query->callback) {
937 if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
938 query->callback(query,
939 mad_recv_wc->recv_buf.mad->mad_hdr.status ?
940 -EINVAL : 0,
941 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
942 else
943 query->callback(query, -EIO, NULL);
944 }
945
946 ib_free_recv_mad(mad_recv_wc);
947 }
948
949 static void ib_sa_add_one(struct ib_device *device)
950 {
951 struct ib_sa_device *sa_dev;
952 int s, e, i;
953
954 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
955 return;
956
957 if (device->node_type == RDMA_NODE_IB_SWITCH)
958 s = e = 0;
959 else {
960 s = 1;
961 e = device->phys_port_cnt;
962 }
963
964 sa_dev = kmalloc(sizeof *sa_dev +
965 (e - s + 1) * sizeof (struct ib_sa_port),
966 GFP_KERNEL);
967 if (!sa_dev)
968 return;
969
970 sa_dev->start_port = s;
971 sa_dev->end_port = e;
972
973 for (i = 0; i <= e - s; ++i) {
974 sa_dev->port[i].sm_ah = NULL;
975 sa_dev->port[i].port_num = i + s;
976 spin_lock_init(&sa_dev->port[i].ah_lock);
977
978 sa_dev->port[i].agent =
979 ib_register_mad_agent(device, i + s, IB_QPT_GSI,
980 NULL, 0, send_handler,
981 recv_handler, sa_dev);
982 if (IS_ERR(sa_dev->port[i].agent))
983 goto err;
984
985 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah);
986 }
987
988 ib_set_client_data(device, &sa_client, sa_dev);
989
990 /*
991 * We register our event handler after everything is set up,
992 * and then update our cached info after the event handler is
993 * registered to avoid any problems if a port changes state
994 * during our initialization.
995 */
996
997 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
998 if (ib_register_event_handler(&sa_dev->event_handler))
999 goto err;
1000
1001 for (i = 0; i <= e - s; ++i)
1002 update_sm_ah(&sa_dev->port[i].update_task);
1003
1004 return;
1005
1006 err:
1007 while (--i >= 0)
1008 ib_unregister_mad_agent(sa_dev->port[i].agent);
1009
1010 kfree(sa_dev);
1011
1012 return;
1013 }
1014
1015 static void ib_sa_remove_one(struct ib_device *device)
1016 {
1017 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1018 int i;
1019
1020 if (!sa_dev)
1021 return;
1022
1023 ib_unregister_event_handler(&sa_dev->event_handler);
1024
1025 flush_scheduled_work();
1026
1027 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
1028 ib_unregister_mad_agent(sa_dev->port[i].agent);
1029 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
1030 }
1031
1032 kfree(sa_dev);
1033 }
1034
1035 static int __init ib_sa_init(void)
1036 {
1037 int ret;
1038
1039 spin_lock_init(&idr_lock);
1040 spin_lock_init(&tid_lock);
1041
1042 get_random_bytes(&tid, sizeof tid);
1043
1044 ret = ib_register_client(&sa_client);
1045 if (ret) {
1046 printk(KERN_ERR "Couldn't register ib_sa client\n");
1047 goto err1;
1048 }
1049
1050 ret = mcast_init();
1051 if (ret) {
1052 printk(KERN_ERR "Couldn't initialize multicast handling\n");
1053 goto err2;
1054 }
1055
1056 return 0;
1057 err2:
1058 ib_unregister_client(&sa_client);
1059 err1:
1060 return ret;
1061 }
1062
1063 static void __exit ib_sa_cleanup(void)
1064 {
1065 mcast_cleanup();
1066 ib_unregister_client(&sa_client);
1067 idr_destroy(&query_idr);
1068 }
1069
1070 module_init(ib_sa_init);
1071 module_exit(ib_sa_cleanup);
Linux with added FPC-III support