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Merge master.kernel.org:/pub/scm/linux/kernel/git/chrisw/lsm-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
47 #include <rdma/ib_pack.h>
48 #include <rdma/ib_sa.h>
49
50 MODULE_AUTHOR("Roland Dreier");
51 MODULE_DESCRIPTION("InfiniBand subnet administration query support");
52 MODULE_LICENSE("Dual BSD/GPL");
53
54 struct ib_sa_sm_ah {
55 struct ib_ah *ah;
56 struct kref ref;
57 };
58
59 struct ib_sa_port {
60 struct ib_mad_agent *agent;
61 struct ib_sa_sm_ah *sm_ah;
62 struct work_struct update_task;
63 spinlock_t ah_lock;
64 u8 port_num;
65 };
66
67 struct ib_sa_device {
68 int start_port, end_port;
69 struct ib_event_handler event_handler;
70 struct ib_sa_port port[0];
71 };
72
73 struct ib_sa_query {
74 void (*callback)(struct ib_sa_query *, int, struct ib_sa_mad *);
75 void (*release)(struct ib_sa_query *);
76 struct ib_sa_port *port;
77 struct ib_sa_mad *mad;
78 struct ib_sa_sm_ah *sm_ah;
79 DECLARE_PCI_UNMAP_ADDR(mapping)
80 int id;
81 };
82
83 struct ib_sa_service_query {
84 void (*callback)(int, struct ib_sa_service_rec *, void *);
85 void *context;
86 struct ib_sa_query sa_query;
87 };
88
89 struct ib_sa_path_query {
90 void (*callback)(int, struct ib_sa_path_rec *, void *);
91 void *context;
92 struct ib_sa_query sa_query;
93 };
94
95 struct ib_sa_mcmember_query {
96 void (*callback)(int, struct ib_sa_mcmember_rec *, void *);
97 void *context;
98 struct ib_sa_query sa_query;
99 };
100
101 static void ib_sa_add_one(struct ib_device *device);
102 static void ib_sa_remove_one(struct ib_device *device);
103
104 static struct ib_client sa_client = {
105 .name = "sa",
106 .add = ib_sa_add_one,
107 .remove = ib_sa_remove_one
108 };
109
110 static spinlock_t idr_lock;
111 static DEFINE_IDR(query_idr);
112
113 static spinlock_t tid_lock;
114 static u32 tid;
115
116 #define PATH_REC_FIELD(field) \
117 .struct_offset_bytes = offsetof(struct ib_sa_path_rec, field), \
118 .struct_size_bytes = sizeof ((struct ib_sa_path_rec *) 0)->field, \
119 .field_name = "sa_path_rec:" #field
120
121 static const struct ib_field path_rec_table[] = {
122 { RESERVED,
123 .offset_words = 0,
124 .offset_bits = 0,
125 .size_bits = 32 },
126 { RESERVED,
127 .offset_words = 1,
128 .offset_bits = 0,
129 .size_bits = 32 },
130 { PATH_REC_FIELD(dgid),
131 .offset_words = 2,
132 .offset_bits = 0,
133 .size_bits = 128 },
134 { PATH_REC_FIELD(sgid),
135 .offset_words = 6,
136 .offset_bits = 0,
137 .size_bits = 128 },
138 { PATH_REC_FIELD(dlid),
139 .offset_words = 10,
140 .offset_bits = 0,
141 .size_bits = 16 },
142 { PATH_REC_FIELD(slid),
143 .offset_words = 10,
144 .offset_bits = 16,
145 .size_bits = 16 },
146 { PATH_REC_FIELD(raw_traffic),
147 .offset_words = 11,
148 .offset_bits = 0,
149 .size_bits = 1 },
150 { RESERVED,
151 .offset_words = 11,
152 .offset_bits = 1,
153 .size_bits = 3 },
154 { PATH_REC_FIELD(flow_label),
155 .offset_words = 11,
156 .offset_bits = 4,
157 .size_bits = 20 },
158 { PATH_REC_FIELD(hop_limit),
159 .offset_words = 11,
160 .offset_bits = 24,
161 .size_bits = 8 },
162 { PATH_REC_FIELD(traffic_class),
163 .offset_words = 12,
164 .offset_bits = 0,
165 .size_bits = 8 },
166 { PATH_REC_FIELD(reversible),
167 .offset_words = 12,
168 .offset_bits = 8,
169 .size_bits = 1 },
170 { PATH_REC_FIELD(numb_path),
171 .offset_words = 12,
172 .offset_bits = 9,
173 .size_bits = 7 },
174 { PATH_REC_FIELD(pkey),
175 .offset_words = 12,
176 .offset_bits = 16,
177 .size_bits = 16 },
178 { RESERVED,
179 .offset_words = 13,
180 .offset_bits = 0,
181 .size_bits = 12 },
182 { PATH_REC_FIELD(sl),
183 .offset_words = 13,
184 .offset_bits = 12,
185 .size_bits = 4 },
186 { PATH_REC_FIELD(mtu_selector),
187 .offset_words = 13,
188 .offset_bits = 16,
189 .size_bits = 2 },
190 { PATH_REC_FIELD(mtu),
191 .offset_words = 13,
192 .offset_bits = 18,
193 .size_bits = 6 },
194 { PATH_REC_FIELD(rate_selector),
195 .offset_words = 13,
196 .offset_bits = 24,
197 .size_bits = 2 },
198 { PATH_REC_FIELD(rate),
199 .offset_words = 13,
200 .offset_bits = 26,
201 .size_bits = 6 },
202 { PATH_REC_FIELD(packet_life_time_selector),
203 .offset_words = 14,
204 .offset_bits = 0,
205 .size_bits = 2 },
206 { PATH_REC_FIELD(packet_life_time),
207 .offset_words = 14,
208 .offset_bits = 2,
209 .size_bits = 6 },
210 { PATH_REC_FIELD(preference),
211 .offset_words = 14,
212 .offset_bits = 8,
213 .size_bits = 8 },
214 { RESERVED,
215 .offset_words = 14,
216 .offset_bits = 16,
217 .size_bits = 48 },
218 };
219
220 #define MCMEMBER_REC_FIELD(field) \
221 .struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field), \
222 .struct_size_bytes = sizeof ((struct ib_sa_mcmember_rec *) 0)->field, \
223 .field_name = "sa_mcmember_rec:" #field
224
225 static const struct ib_field mcmember_rec_table[] = {
226 { MCMEMBER_REC_FIELD(mgid),
227 .offset_words = 0,
228 .offset_bits = 0,
229 .size_bits = 128 },
230 { MCMEMBER_REC_FIELD(port_gid),
231 .offset_words = 4,
232 .offset_bits = 0,
233 .size_bits = 128 },
234 { MCMEMBER_REC_FIELD(qkey),
235 .offset_words = 8,
236 .offset_bits = 0,
237 .size_bits = 32 },
238 { MCMEMBER_REC_FIELD(mlid),
239 .offset_words = 9,
240 .offset_bits = 0,
241 .size_bits = 16 },
242 { MCMEMBER_REC_FIELD(mtu_selector),
243 .offset_words = 9,
244 .offset_bits = 16,
245 .size_bits = 2 },
246 { MCMEMBER_REC_FIELD(mtu),
247 .offset_words = 9,
248 .offset_bits = 18,
249 .size_bits = 6 },
250 { MCMEMBER_REC_FIELD(traffic_class),
251 .offset_words = 9,
252 .offset_bits = 24,
253 .size_bits = 8 },
254 { MCMEMBER_REC_FIELD(pkey),
255 .offset_words = 10,
256 .offset_bits = 0,
257 .size_bits = 16 },
258 { MCMEMBER_REC_FIELD(rate_selector),
259 .offset_words = 10,
260 .offset_bits = 16,
261 .size_bits = 2 },
262 { MCMEMBER_REC_FIELD(rate),
263 .offset_words = 10,
264 .offset_bits = 18,
265 .size_bits = 6 },
266 { MCMEMBER_REC_FIELD(packet_life_time_selector),
267 .offset_words = 10,
268 .offset_bits = 24,
269 .size_bits = 2 },
270 { MCMEMBER_REC_FIELD(packet_life_time),
271 .offset_words = 10,
272 .offset_bits = 26,
273 .size_bits = 6 },
274 { MCMEMBER_REC_FIELD(sl),
275 .offset_words = 11,
276 .offset_bits = 0,
277 .size_bits = 4 },
278 { MCMEMBER_REC_FIELD(flow_label),
279 .offset_words = 11,
280 .offset_bits = 4,
281 .size_bits = 20 },
282 { MCMEMBER_REC_FIELD(hop_limit),
283 .offset_words = 11,
284 .offset_bits = 24,
285 .size_bits = 8 },
286 { MCMEMBER_REC_FIELD(scope),
287 .offset_words = 12,
288 .offset_bits = 0,
289 .size_bits = 4 },
290 { MCMEMBER_REC_FIELD(join_state),
291 .offset_words = 12,
292 .offset_bits = 4,
293 .size_bits = 4 },
294 { MCMEMBER_REC_FIELD(proxy_join),
295 .offset_words = 12,
296 .offset_bits = 8,
297 .size_bits = 1 },
298 { RESERVED,
299 .offset_words = 12,
300 .offset_bits = 9,
301 .size_bits = 23 },
302 };
303
304 #define SERVICE_REC_FIELD(field) \
305 .struct_offset_bytes = offsetof(struct ib_sa_service_rec, field), \
306 .struct_size_bytes = sizeof ((struct ib_sa_service_rec *) 0)->field, \
307 .field_name = "sa_service_rec:" #field
308
309 static const struct ib_field service_rec_table[] = {
310 { SERVICE_REC_FIELD(id),
311 .offset_words = 0,
312 .offset_bits = 0,
313 .size_bits = 64 },
314 { SERVICE_REC_FIELD(gid),
315 .offset_words = 2,
316 .offset_bits = 0,
317 .size_bits = 128 },
318 { SERVICE_REC_FIELD(pkey),
319 .offset_words = 6,
320 .offset_bits = 0,
321 .size_bits = 16 },
322 { SERVICE_REC_FIELD(lease),
323 .offset_words = 7,
324 .offset_bits = 0,
325 .size_bits = 32 },
326 { SERVICE_REC_FIELD(key),
327 .offset_words = 8,
328 .offset_bits = 0,
329 .size_bits = 128 },
330 { SERVICE_REC_FIELD(name),
331 .offset_words = 12,
332 .offset_bits = 0,
333 .size_bits = 64*8 },
334 { SERVICE_REC_FIELD(data8),
335 .offset_words = 28,
336 .offset_bits = 0,
337 .size_bits = 16*8 },
338 { SERVICE_REC_FIELD(data16),
339 .offset_words = 32,
340 .offset_bits = 0,
341 .size_bits = 8*16 },
342 { SERVICE_REC_FIELD(data32),
343 .offset_words = 36,
344 .offset_bits = 0,
345 .size_bits = 4*32 },
346 { SERVICE_REC_FIELD(data64),
347 .offset_words = 40,
348 .offset_bits = 0,
349 .size_bits = 2*64 },
350 };
351
352 static void free_sm_ah(struct kref *kref)
353 {
354 struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref);
355
356 ib_destroy_ah(sm_ah->ah);
357 kfree(sm_ah);
358 }
359
360 static void update_sm_ah(void *port_ptr)
361 {
362 struct ib_sa_port *port = port_ptr;
363 struct ib_sa_sm_ah *new_ah, *old_ah;
364 struct ib_port_attr port_attr;
365 struct ib_ah_attr ah_attr;
366
367 if (ib_query_port(port->agent->device, port->port_num, &port_attr)) {
368 printk(KERN_WARNING "Couldn't query port\n");
369 return;
370 }
371
372 new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL);
373 if (!new_ah) {
374 printk(KERN_WARNING "Couldn't allocate new SM AH\n");
375 return;
376 }
377
378 kref_init(&new_ah->ref);
379
380 memset(&ah_attr, 0, sizeof ah_attr);
381 ah_attr.dlid = port_attr.sm_lid;
382 ah_attr.sl = port_attr.sm_sl;
383 ah_attr.port_num = port->port_num;
384
385 new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr);
386 if (IS_ERR(new_ah->ah)) {
387 printk(KERN_WARNING "Couldn't create new SM AH\n");
388 kfree(new_ah);
389 return;
390 }
391
392 spin_lock_irq(&port->ah_lock);
393 old_ah = port->sm_ah;
394 port->sm_ah = new_ah;
395 spin_unlock_irq(&port->ah_lock);
396
397 if (old_ah)
398 kref_put(&old_ah->ref, free_sm_ah);
399 }
400
401 static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event)
402 {
403 if (event->event == IB_EVENT_PORT_ERR ||
404 event->event == IB_EVENT_PORT_ACTIVE ||
405 event->event == IB_EVENT_LID_CHANGE ||
406 event->event == IB_EVENT_PKEY_CHANGE ||
407 event->event == IB_EVENT_SM_CHANGE) {
408 struct ib_sa_device *sa_dev;
409 sa_dev = container_of(handler, typeof(*sa_dev), event_handler);
410
411 schedule_work(&sa_dev->port[event->element.port_num -
412 sa_dev->start_port].update_task);
413 }
414 }
415
416 /**
417 * ib_sa_cancel_query - try to cancel an SA query
418 * @id:ID of query to cancel
419 * @query:query pointer to cancel
420 *
421 * Try to cancel an SA query. If the id and query don't match up or
422 * the query has already completed, nothing is done. Otherwise the
423 * query is canceled and will complete with a status of -EINTR.
424 */
425 void ib_sa_cancel_query(int id, struct ib_sa_query *query)
426 {
427 unsigned long flags;
428 struct ib_mad_agent *agent;
429
430 spin_lock_irqsave(&idr_lock, flags);
431 if (idr_find(&query_idr, id) != query) {
432 spin_unlock_irqrestore(&idr_lock, flags);
433 return;
434 }
435 agent = query->port->agent;
436 spin_unlock_irqrestore(&idr_lock, flags);
437
438 ib_cancel_mad(agent, id);
439 }
440 EXPORT_SYMBOL(ib_sa_cancel_query);
441
442 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
443 {
444 unsigned long flags;
445
446 memset(mad, 0, sizeof *mad);
447
448 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION;
449 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
450 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
451
452 spin_lock_irqsave(&tid_lock, flags);
453 mad->mad_hdr.tid =
454 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
455 spin_unlock_irqrestore(&tid_lock, flags);
456 }
457
458 static int send_mad(struct ib_sa_query *query, int timeout_ms)
459 {
460 struct ib_sa_port *port = query->port;
461 unsigned long flags;
462 int ret;
463 struct ib_sge gather_list;
464 struct ib_send_wr *bad_wr, wr = {
465 .opcode = IB_WR_SEND,
466 .sg_list = &gather_list,
467 .num_sge = 1,
468 .send_flags = IB_SEND_SIGNALED,
469 .wr = {
470 .ud = {
471 .mad_hdr = &query->mad->mad_hdr,
472 .remote_qpn = 1,
473 .remote_qkey = IB_QP1_QKEY,
474 .timeout_ms = timeout_ms,
475 }
476 }
477 };
478
479 retry:
480 if (!idr_pre_get(&query_idr, GFP_ATOMIC))
481 return -ENOMEM;
482 spin_lock_irqsave(&idr_lock, flags);
483 ret = idr_get_new(&query_idr, query, &query->id);
484 spin_unlock_irqrestore(&idr_lock, flags);
485 if (ret == -EAGAIN)
486 goto retry;
487 if (ret)
488 return ret;
489
490 wr.wr_id = query->id;
491
492 spin_lock_irqsave(&port->ah_lock, flags);
493 kref_get(&port->sm_ah->ref);
494 query->sm_ah = port->sm_ah;
495 wr.wr.ud.ah = port->sm_ah->ah;
496 spin_unlock_irqrestore(&port->ah_lock, flags);
497
498 gather_list.addr = dma_map_single(port->agent->device->dma_device,
499 query->mad,
500 sizeof (struct ib_sa_mad),
501 DMA_TO_DEVICE);
502 gather_list.length = sizeof (struct ib_sa_mad);
503 gather_list.lkey = port->agent->mr->lkey;
504 pci_unmap_addr_set(query, mapping, gather_list.addr);
505
506 ret = ib_post_send_mad(port->agent, &wr, &bad_wr);
507 if (ret) {
508 dma_unmap_single(port->agent->device->dma_device,
509 pci_unmap_addr(query, mapping),
510 sizeof (struct ib_sa_mad),
511 DMA_TO_DEVICE);
512 kref_put(&query->sm_ah->ref, free_sm_ah);
513 spin_lock_irqsave(&idr_lock, flags);
514 idr_remove(&query_idr, query->id);
515 spin_unlock_irqrestore(&idr_lock, flags);
516 }
517
518 /*
519 * It's not safe to dereference query any more, because the
520 * send may already have completed and freed the query in
521 * another context. So use wr.wr_id, which has a copy of the
522 * query's id.
523 */
524 return ret ? ret : wr.wr_id;
525 }
526
527 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
528 int status,
529 struct ib_sa_mad *mad)
530 {
531 struct ib_sa_path_query *query =
532 container_of(sa_query, struct ib_sa_path_query, sa_query);
533
534 if (mad) {
535 struct ib_sa_path_rec rec;
536
537 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
538 mad->data, &rec);
539 query->callback(status, &rec, query->context);
540 } else
541 query->callback(status, NULL, query->context);
542 }
543
544 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
545 {
546 kfree(sa_query->mad);
547 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query));
548 }
549
550 /**
551 * ib_sa_path_rec_get - Start a Path get query
552 * @device:device to send query on
553 * @port_num: port number to send query on
554 * @rec:Path Record to send in query
555 * @comp_mask:component mask to send in query
556 * @timeout_ms:time to wait for response
557 * @gfp_mask:GFP mask to use for internal allocations
558 * @callback:function called when query completes, times out or is
559 * canceled
560 * @context:opaque user context passed to callback
561 * @sa_query:query context, used to cancel query
562 *
563 * Send a Path Record Get query to the SA to look up a path. The
564 * callback function will be called when the query completes (or
565 * fails); status is 0 for a successful response, -EINTR if the query
566 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
567 * occurred sending the query. The resp parameter of the callback is
568 * only valid if status is 0.
569 *
570 * If the return value of ib_sa_path_rec_get() is negative, it is an
571 * error code. Otherwise it is a query ID that can be used to cancel
572 * the query.
573 */
574 int ib_sa_path_rec_get(struct ib_device *device, u8 port_num,
575 struct ib_sa_path_rec *rec,
576 ib_sa_comp_mask comp_mask,
577 int timeout_ms, unsigned int __nocast gfp_mask,
578 void (*callback)(int status,
579 struct ib_sa_path_rec *resp,
580 void *context),
581 void *context,
582 struct ib_sa_query **sa_query)
583 {
584 struct ib_sa_path_query *query;
585 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
586 struct ib_sa_port *port = &sa_dev->port[port_num - sa_dev->start_port];
587 struct ib_mad_agent *agent = port->agent;
588 int ret;
589
590 query = kmalloc(sizeof *query, gfp_mask);
591 if (!query)
592 return -ENOMEM;
593 query->sa_query.mad = kmalloc(sizeof *query->sa_query.mad, gfp_mask);
594 if (!query->sa_query.mad) {
595 kfree(query);
596 return -ENOMEM;
597 }
598
599 query->callback = callback;
600 query->context = context;
601
602 init_mad(query->sa_query.mad, agent);
603
604 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
605 query->sa_query.release = ib_sa_path_rec_release;
606 query->sa_query.port = port;
607 query->sa_query.mad->mad_hdr.method = IB_MGMT_METHOD_GET;
608 query->sa_query.mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC);
609 query->sa_query.mad->sa_hdr.comp_mask = comp_mask;
610
611 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table),
612 rec, query->sa_query.mad->data);
613
614 *sa_query = &query->sa_query;
615
616 ret = send_mad(&query->sa_query, timeout_ms);
617 if (ret < 0) {
618 *sa_query = NULL;
619 kfree(query->sa_query.mad);
620 kfree(query);
621 }
622
623 return ret;
624 }
625 EXPORT_SYMBOL(ib_sa_path_rec_get);
626
627 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query,
628 int status,
629 struct ib_sa_mad *mad)
630 {
631 struct ib_sa_service_query *query =
632 container_of(sa_query, struct ib_sa_service_query, sa_query);
633
634 if (mad) {
635 struct ib_sa_service_rec rec;
636
637 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table),
638 mad->data, &rec);
639 query->callback(status, &rec, query->context);
640 } else
641 query->callback(status, NULL, query->context);
642 }
643
644 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query)
645 {
646 kfree(sa_query->mad);
647 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query));
648 }
649
650 /**
651 * ib_sa_service_rec_query - Start Service Record operation
652 * @device:device to send request on
653 * @port_num: port number to send request on
654 * @method:SA method - should be get, set, or delete
655 * @rec:Service Record to send in request
656 * @comp_mask:component mask to send in request
657 * @timeout_ms:time to wait for response
658 * @gfp_mask:GFP mask to use for internal allocations
659 * @callback:function called when request completes, times out or is
660 * canceled
661 * @context:opaque user context passed to callback
662 * @sa_query:request context, used to cancel request
663 *
664 * Send a Service Record set/get/delete to the SA to register,
665 * unregister or query a service record.
666 * The callback function will be called when the request completes (or
667 * fails); status is 0 for a successful response, -EINTR if the query
668 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
669 * occurred sending the query. The resp parameter of the callback is
670 * only valid if status is 0.
671 *
672 * If the return value of ib_sa_service_rec_query() is negative, it is an
673 * error code. Otherwise it is a request ID that can be used to cancel
674 * the query.
675 */
676 int ib_sa_service_rec_query(struct ib_device *device, u8 port_num, u8 method,
677 struct ib_sa_service_rec *rec,
678 ib_sa_comp_mask comp_mask,
679 int timeout_ms, unsigned int __nocast gfp_mask,
680 void (*callback)(int status,
681 struct ib_sa_service_rec *resp,
682 void *context),
683 void *context,
684 struct ib_sa_query **sa_query)
685 {
686 struct ib_sa_service_query *query;
687 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
688 struct ib_sa_port *port = &sa_dev->port[port_num - sa_dev->start_port];
689 struct ib_mad_agent *agent = port->agent;
690 int ret;
691
692 if (method != IB_MGMT_METHOD_GET &&
693 method != IB_MGMT_METHOD_SET &&
694 method != IB_SA_METHOD_DELETE)
695 return -EINVAL;
696
697 query = kmalloc(sizeof *query, gfp_mask);
698 if (!query)
699 return -ENOMEM;
700 query->sa_query.mad = kmalloc(sizeof *query->sa_query.mad, gfp_mask);
701 if (!query->sa_query.mad) {
702 kfree(query);
703 return -ENOMEM;
704 }
705
706 query->callback = callback;
707 query->context = context;
708
709 init_mad(query->sa_query.mad, agent);
710
711 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
712 query->sa_query.release = ib_sa_service_rec_release;
713 query->sa_query.port = port;
714 query->sa_query.mad->mad_hdr.method = method;
715 query->sa_query.mad->mad_hdr.attr_id =
716 cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
717 query->sa_query.mad->sa_hdr.comp_mask = comp_mask;
718
719 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table),
720 rec, query->sa_query.mad->data);
721
722 *sa_query = &query->sa_query;
723
724 ret = send_mad(&query->sa_query, timeout_ms);
725 if (ret < 0) {
726 *sa_query = NULL;
727 kfree(query->sa_query.mad);
728 kfree(query);
729 }
730
731 return ret;
732 }
733 EXPORT_SYMBOL(ib_sa_service_rec_query);
734
735 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
736 int status,
737 struct ib_sa_mad *mad)
738 {
739 struct ib_sa_mcmember_query *query =
740 container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
741
742 if (mad) {
743 struct ib_sa_mcmember_rec rec;
744
745 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
746 mad->data, &rec);
747 query->callback(status, &rec, query->context);
748 } else
749 query->callback(status, NULL, query->context);
750 }
751
752 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
753 {
754 kfree(sa_query->mad);
755 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
756 }
757
758 int ib_sa_mcmember_rec_query(struct ib_device *device, u8 port_num,
759 u8 method,
760 struct ib_sa_mcmember_rec *rec,
761 ib_sa_comp_mask comp_mask,
762 int timeout_ms, unsigned int __nocast gfp_mask,
763 void (*callback)(int status,
764 struct ib_sa_mcmember_rec *resp,
765 void *context),
766 void *context,
767 struct ib_sa_query **sa_query)
768 {
769 struct ib_sa_mcmember_query *query;
770 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
771 struct ib_sa_port *port = &sa_dev->port[port_num - sa_dev->start_port];
772 struct ib_mad_agent *agent = port->agent;
773 int ret;
774
775 query = kmalloc(sizeof *query, gfp_mask);
776 if (!query)
777 return -ENOMEM;
778 query->sa_query.mad = kmalloc(sizeof *query->sa_query.mad, gfp_mask);
779 if (!query->sa_query.mad) {
780 kfree(query);
781 return -ENOMEM;
782 }
783
784 query->callback = callback;
785 query->context = context;
786
787 init_mad(query->sa_query.mad, agent);
788
789 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
790 query->sa_query.release = ib_sa_mcmember_rec_release;
791 query->sa_query.port = port;
792 query->sa_query.mad->mad_hdr.method = method;
793 query->sa_query.mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
794 query->sa_query.mad->sa_hdr.comp_mask = comp_mask;
795
796 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
797 rec, query->sa_query.mad->data);
798
799 *sa_query = &query->sa_query;
800
801 ret = send_mad(&query->sa_query, timeout_ms);
802 if (ret < 0) {
803 *sa_query = NULL;
804 kfree(query->sa_query.mad);
805 kfree(query);
806 }
807
808 return ret;
809 }
810 EXPORT_SYMBOL(ib_sa_mcmember_rec_query);
811
812 static void send_handler(struct ib_mad_agent *agent,
813 struct ib_mad_send_wc *mad_send_wc)
814 {
815 struct ib_sa_query *query;
816 unsigned long flags;
817
818 spin_lock_irqsave(&idr_lock, flags);
819 query = idr_find(&query_idr, mad_send_wc->wr_id);
820 spin_unlock_irqrestore(&idr_lock, flags);
821
822 if (!query)
823 return;
824
825 if (query->callback)
826 switch (mad_send_wc->status) {
827 case IB_WC_SUCCESS:
828 /* No callback -- already got recv */
829 break;
830 case IB_WC_RESP_TIMEOUT_ERR:
831 query->callback(query, -ETIMEDOUT, NULL);
832 break;
833 case IB_WC_WR_FLUSH_ERR:
834 query->callback(query, -EINTR, NULL);
835 break;
836 default:
837 query->callback(query, -EIO, NULL);
838 break;
839 }
840
841 dma_unmap_single(agent->device->dma_device,
842 pci_unmap_addr(query, mapping),
843 sizeof (struct ib_sa_mad),
844 DMA_TO_DEVICE);
845 kref_put(&query->sm_ah->ref, free_sm_ah);
846
847 query->release(query);
848
849 spin_lock_irqsave(&idr_lock, flags);
850 idr_remove(&query_idr, mad_send_wc->wr_id);
851 spin_unlock_irqrestore(&idr_lock, flags);
852 }
853
854 static void recv_handler(struct ib_mad_agent *mad_agent,
855 struct ib_mad_recv_wc *mad_recv_wc)
856 {
857 struct ib_sa_query *query;
858 unsigned long flags;
859
860 spin_lock_irqsave(&idr_lock, flags);
861 query = idr_find(&query_idr, mad_recv_wc->wc->wr_id);
862 spin_unlock_irqrestore(&idr_lock, flags);
863
864 if (query && query->callback) {
865 if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
866 query->callback(query,
867 mad_recv_wc->recv_buf.mad->mad_hdr.status ?
868 -EINVAL : 0,
869 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
870 else
871 query->callback(query, -EIO, NULL);
872 }
873
874 ib_free_recv_mad(mad_recv_wc);
875 }
876
877 static void ib_sa_add_one(struct ib_device *device)
878 {
879 struct ib_sa_device *sa_dev;
880 int s, e, i;
881
882 if (device->node_type == IB_NODE_SWITCH)
883 s = e = 0;
884 else {
885 s = 1;
886 e = device->phys_port_cnt;
887 }
888
889 sa_dev = kmalloc(sizeof *sa_dev +
890 (e - s + 1) * sizeof (struct ib_sa_port),
891 GFP_KERNEL);
892 if (!sa_dev)
893 return;
894
895 sa_dev->start_port = s;
896 sa_dev->end_port = e;
897
898 for (i = 0; i <= e - s; ++i) {
899 sa_dev->port[i].sm_ah = NULL;
900 sa_dev->port[i].port_num = i + s;
901 spin_lock_init(&sa_dev->port[i].ah_lock);
902
903 sa_dev->port[i].agent =
904 ib_register_mad_agent(device, i + s, IB_QPT_GSI,
905 NULL, 0, send_handler,
906 recv_handler, sa_dev);
907 if (IS_ERR(sa_dev->port[i].agent))
908 goto err;
909
910 INIT_WORK(&sa_dev->port[i].update_task,
911 update_sm_ah, &sa_dev->port[i]);
912 }
913
914 ib_set_client_data(device, &sa_client, sa_dev);
915
916 /*
917 * We register our event handler after everything is set up,
918 * and then update our cached info after the event handler is
919 * registered to avoid any problems if a port changes state
920 * during our initialization.
921 */
922
923 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
924 if (ib_register_event_handler(&sa_dev->event_handler))
925 goto err;
926
927 for (i = 0; i <= e - s; ++i)
928 update_sm_ah(&sa_dev->port[i]);
929
930 return;
931
932 err:
933 while (--i >= 0)
934 ib_unregister_mad_agent(sa_dev->port[i].agent);
935
936 kfree(sa_dev);
937
938 return;
939 }
940
941 static void ib_sa_remove_one(struct ib_device *device)
942 {
943 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
944 int i;
945
946 if (!sa_dev)
947 return;
948
949 ib_unregister_event_handler(&sa_dev->event_handler);
950
951 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
952 ib_unregister_mad_agent(sa_dev->port[i].agent);
953 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
954 }
955
956 kfree(sa_dev);
957 }
958
959 static int __init ib_sa_init(void)
960 {
961 int ret;
962
963 spin_lock_init(&idr_lock);
964 spin_lock_init(&tid_lock);
965
966 get_random_bytes(&tid, sizeof tid);
967
968 ret = ib_register_client(&sa_client);
969 if (ret)
970 printk(KERN_ERR "Couldn't register ib_sa client\n");
971
972 return ret;
973 }
974
975 static void __exit ib_sa_cleanup(void)
976 {
977 ib_unregister_client(&sa_client);
978 }
979
980 module_init(ib_sa_init);
981 module_exit(ib_sa_cleanup);
Linux kernel - Deliverables
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