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