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fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / drivers / infiniband / core / sa_query.c
blobcf474ec270703fd8e565c19e28f8bc378f326e70
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/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_cache.h>
50 #include "sa.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 u16 pkey_index;
60 u8 src_path_mask;
61 };
62
63 struct ib_sa_port {
64 struct ib_mad_agent *agent;
65 struct ib_sa_sm_ah *sm_ah;
66 struct work_struct update_task;
67 spinlock_t ah_lock;
68 u8 port_num;
69 };
70
71 struct ib_sa_device {
72 int start_port, end_port;
73 struct ib_event_handler event_handler;
74 struct ib_sa_port port[0];
75 };
76
77 struct ib_sa_query {
78 void (*callback)(struct ib_sa_query *, int, struct ib_sa_mad *);
79 void (*release)(struct ib_sa_query *);
80 struct ib_sa_client *client;
81 struct ib_sa_port *port;
82 struct ib_mad_send_buf *mad_buf;
83 struct ib_sa_sm_ah *sm_ah;
84 int id;
85 };
86
87 struct ib_sa_service_query {
88 void (*callback)(int, struct ib_sa_service_rec *, void *);
89 void *context;
90 struct ib_sa_query sa_query;
91 };
92
93 struct ib_sa_path_query {
94 void (*callback)(int, struct ib_sa_path_rec *, void *);
95 void *context;
96 struct ib_sa_query sa_query;
97 };
98
99 struct ib_sa_mcmember_query {
100 void (*callback)(int, struct ib_sa_mcmember_rec *, void *);
101 void *context;
102 struct ib_sa_query sa_query;
103 };
104
105 static void ib_sa_add_one(struct ib_device *device);
106 static void ib_sa_remove_one(struct ib_device *device);
107
108 static struct ib_client sa_client = {
109 .name = "sa",
110 .add = ib_sa_add_one,
111 .remove = ib_sa_remove_one
112 };
113
114 static spinlock_t idr_lock;
115 static DEFINE_IDR(query_idr);
116
117 static spinlock_t tid_lock;
118 static u32 tid;
119
120 #define PATH_REC_FIELD(field) \
121 .struct_offset_bytes = offsetof(struct ib_sa_path_rec, field), \
122 .struct_size_bytes = sizeof ((struct ib_sa_path_rec *) 0)->field, \
123 .field_name = "sa_path_rec:" #field
124
125 static const struct ib_field path_rec_table[] = {
126 { PATH_REC_FIELD(service_id),
127 .offset_words = 0,
128 .offset_bits = 0,
129 .size_bits = 64 },
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 { PATH_REC_FIELD(qos_class),
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(struct work_struct *work)
361 {
362 struct ib_sa_port *port =
363 container_of(work, struct ib_sa_port, update_task);
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 new_ah->src_path_mask = (1 << port_attr.lmc) - 1;
381
382 new_ah->pkey_index = 0;
383 if (ib_find_pkey(port->agent->device, port->port_num,
384 IB_DEFAULT_PKEY_FULL, &new_ah->pkey_index))
385 printk(KERN_ERR "Couldn't find index for default PKey\n");
386
387 memset(&ah_attr, 0, sizeof ah_attr);
388 ah_attr.dlid = port_attr.sm_lid;
389 ah_attr.sl = port_attr.sm_sl;
390 ah_attr.port_num = port->port_num;
391
392 new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr);
393 if (IS_ERR(new_ah->ah)) {
394 printk(KERN_WARNING "Couldn't create new SM AH\n");
395 kfree(new_ah);
396 return;
397 }
398
399 spin_lock_irq(&port->ah_lock);
400 old_ah = port->sm_ah;
401 port->sm_ah = new_ah;
402 spin_unlock_irq(&port->ah_lock);
403
404 if (old_ah)
405 kref_put(&old_ah->ref, free_sm_ah);
406 }
407
408 static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event)
409 {
410 if (event->event == IB_EVENT_PORT_ERR ||
411 event->event == IB_EVENT_PORT_ACTIVE ||
412 event->event == IB_EVENT_LID_CHANGE ||
413 event->event == IB_EVENT_PKEY_CHANGE ||
414 event->event == IB_EVENT_SM_CHANGE ||
415 event->event == IB_EVENT_CLIENT_REREGISTER) {
416 struct ib_sa_device *sa_dev;
417 sa_dev = container_of(handler, typeof(*sa_dev), event_handler);
418
419 schedule_work(&sa_dev->port[event->element.port_num -
420 sa_dev->start_port].update_task);
421 }
422 }
423
424 void ib_sa_register_client(struct ib_sa_client *client)
425 {
426 atomic_set(&client->users, 1);
427 init_completion(&client->comp);
428 }
429 EXPORT_SYMBOL(ib_sa_register_client);
430
431 void ib_sa_unregister_client(struct ib_sa_client *client)
432 {
433 ib_sa_client_put(client);
434 wait_for_completion(&client->comp);
435 }
436 EXPORT_SYMBOL(ib_sa_unregister_client);
437
438 /**
439 * ib_sa_cancel_query - try to cancel an SA query
440 * @id:ID of query to cancel
441 * @query:query pointer to cancel
442 *
443 * Try to cancel an SA query. If the id and query don't match up or
444 * the query has already completed, nothing is done. Otherwise the
445 * query is canceled and will complete with a status of -EINTR.
446 */
447 void ib_sa_cancel_query(int id, struct ib_sa_query *query)
448 {
449 unsigned long flags;
450 struct ib_mad_agent *agent;
451 struct ib_mad_send_buf *mad_buf;
452
453 spin_lock_irqsave(&idr_lock, flags);
454 if (idr_find(&query_idr, id) != query) {
455 spin_unlock_irqrestore(&idr_lock, flags);
456 return;
457 }
458 agent = query->port->agent;
459 mad_buf = query->mad_buf;
460 spin_unlock_irqrestore(&idr_lock, flags);
461
462 ib_cancel_mad(agent, mad_buf);
463 }
464 EXPORT_SYMBOL(ib_sa_cancel_query);
465
466 static u8 get_src_path_mask(struct ib_device *device, u8 port_num)
467 {
468 struct ib_sa_device *sa_dev;
469 struct ib_sa_port *port;
470 unsigned long flags;
471 u8 src_path_mask;
472
473 sa_dev = ib_get_client_data(device, &sa_client);
474 if (!sa_dev)
475 return 0x7f;
476
477 port = &sa_dev->port[port_num - sa_dev->start_port];
478 spin_lock_irqsave(&port->ah_lock, flags);
479 src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f;
480 spin_unlock_irqrestore(&port->ah_lock, flags);
481
482 return src_path_mask;
483 }
484
485 int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
486 struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr)
487 {
488 int ret;
489 u16 gid_index;
490
491 memset(ah_attr, 0, sizeof *ah_attr);
492 ah_attr->dlid = be16_to_cpu(rec->dlid);
493 ah_attr->sl = rec->sl;
494 ah_attr->src_path_bits = be16_to_cpu(rec->slid) &
495 get_src_path_mask(device, port_num);
496 ah_attr->port_num = port_num;
497 ah_attr->static_rate = rec->rate;
498
499 if (rec->hop_limit > 1) {
500 ah_attr->ah_flags = IB_AH_GRH;
501 ah_attr->grh.dgid = rec->dgid;
502
503 ret = ib_find_cached_gid(device, &rec->sgid, &port_num,
504 &gid_index);
505 if (ret)
506 return ret;
507
508 ah_attr->grh.sgid_index = gid_index;
509 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
510 ah_attr->grh.hop_limit = rec->hop_limit;
511 ah_attr->grh.traffic_class = rec->traffic_class;
512 }
513 return 0;
514 }
515 EXPORT_SYMBOL(ib_init_ah_from_path);
516
517 static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask)
518 {
519 unsigned long flags;
520
521 spin_lock_irqsave(&query->port->ah_lock, flags);
522 kref_get(&query->port->sm_ah->ref);
523 query->sm_ah = query->port->sm_ah;
524 spin_unlock_irqrestore(&query->port->ah_lock, flags);
525
526 query->mad_buf = ib_create_send_mad(query->port->agent, 1,
527 query->sm_ah->pkey_index,
528 0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA,
529 gfp_mask);
530 if (IS_ERR(query->mad_buf)) {
531 kref_put(&query->sm_ah->ref, free_sm_ah);
532 return -ENOMEM;
533 }
534
535 query->mad_buf->ah = query->sm_ah->ah;
536
537 return 0;
538 }
539
540 static void free_mad(struct ib_sa_query *query)
541 {
542 ib_free_send_mad(query->mad_buf);
543 kref_put(&query->sm_ah->ref, free_sm_ah);
544 }
545
546 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
547 {
548 unsigned long flags;
549
550 memset(mad, 0, sizeof *mad);
551
552 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION;
553 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
554 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
555
556 spin_lock_irqsave(&tid_lock, flags);
557 mad->mad_hdr.tid =
558 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
559 spin_unlock_irqrestore(&tid_lock, flags);
560 }
561
562 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask)
563 {
564 unsigned long flags;
565 int ret, id;
566
567 retry:
568 if (!idr_pre_get(&query_idr, gfp_mask))
569 return -ENOMEM;
570 spin_lock_irqsave(&idr_lock, flags);
571 ret = idr_get_new(&query_idr, query, &id);
572 spin_unlock_irqrestore(&idr_lock, flags);
573 if (ret == -EAGAIN)
574 goto retry;
575 if (ret)
576 return ret;
577
578 query->mad_buf->timeout_ms = timeout_ms;
579 query->mad_buf->context[0] = query;
580 query->id = id;
581
582 ret = ib_post_send_mad(query->mad_buf, NULL);
583 if (ret) {
584 spin_lock_irqsave(&idr_lock, flags);
585 idr_remove(&query_idr, id);
586 spin_unlock_irqrestore(&idr_lock, flags);
587 }
588
589 /*
590 * It's not safe to dereference query any more, because the
591 * send may already have completed and freed the query in
592 * another context.
593 */
594 return ret ? ret : id;
595 }
596
597 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
598 int status,
599 struct ib_sa_mad *mad)
600 {
601 struct ib_sa_path_query *query =
602 container_of(sa_query, struct ib_sa_path_query, sa_query);
603
604 if (mad) {
605 struct ib_sa_path_rec rec;
606
607 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
608 mad->data, &rec);
609 query->callback(status, &rec, query->context);
610 } else
611 query->callback(status, NULL, query->context);
612 }
613
614 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
615 {
616 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query));
617 }
618
619 /**
620 * ib_sa_path_rec_get - Start a Path get query
621 * @client:SA client
622 * @device:device to send query on
623 * @port_num: port number to send query on
624 * @rec:Path Record to send in query
625 * @comp_mask:component mask to send in query
626 * @timeout_ms:time to wait for response
627 * @gfp_mask:GFP mask to use for internal allocations
628 * @callback:function called when query completes, times out or is
629 * canceled
630 * @context:opaque user context passed to callback
631 * @sa_query:query context, used to cancel query
632 *
633 * Send a Path Record Get query to the SA to look up a path. The
634 * callback function will be called when the query completes (or
635 * fails); status is 0 for a successful response, -EINTR if the query
636 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
637 * occurred sending the query. The resp parameter of the callback is
638 * only valid if status is 0.
639 *
640 * If the return value of ib_sa_path_rec_get() is negative, it is an
641 * error code. Otherwise it is a query ID that can be used to cancel
642 * the query.
643 */
644 int ib_sa_path_rec_get(struct ib_sa_client *client,
645 struct ib_device *device, u8 port_num,
646 struct ib_sa_path_rec *rec,
647 ib_sa_comp_mask comp_mask,
648 int timeout_ms, gfp_t gfp_mask,
649 void (*callback)(int status,
650 struct ib_sa_path_rec *resp,
651 void *context),
652 void *context,
653 struct ib_sa_query **sa_query)
654 {
655 struct ib_sa_path_query *query;
656 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
657 struct ib_sa_port *port;
658 struct ib_mad_agent *agent;
659 struct ib_sa_mad *mad;
660 int ret;
661
662 if (!sa_dev)
663 return -ENODEV;
664
665 port = &sa_dev->port[port_num - sa_dev->start_port];
666 agent = port->agent;
667
668 query = kmalloc(sizeof *query, gfp_mask);
669 if (!query)
670 return -ENOMEM;
671
672 query->sa_query.port = port;
673 ret = alloc_mad(&query->sa_query, gfp_mask);
674 if (ret)
675 goto err1;
676
677 ib_sa_client_get(client);
678 query->sa_query.client = client;
679 query->callback = callback;
680 query->context = context;
681
682 mad = query->sa_query.mad_buf->mad;
683 init_mad(mad, agent);
684
685 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
686 query->sa_query.release = ib_sa_path_rec_release;
687 mad->mad_hdr.method = IB_MGMT_METHOD_GET;
688 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC);
689 mad->sa_hdr.comp_mask = comp_mask;
690
691 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data);
692
693 *sa_query = &query->sa_query;
694
695 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
696 if (ret < 0)
697 goto err2;
698
699 return ret;
700
701 err2:
702 *sa_query = NULL;
703 ib_sa_client_put(query->sa_query.client);
704 free_mad(&query->sa_query);
705
706 err1:
707 kfree(query);
708 return ret;
709 }
710 EXPORT_SYMBOL(ib_sa_path_rec_get);
711
712 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query,
713 int status,
714 struct ib_sa_mad *mad)
715 {
716 struct ib_sa_service_query *query =
717 container_of(sa_query, struct ib_sa_service_query, sa_query);
718
719 if (mad) {
720 struct ib_sa_service_rec rec;
721
722 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table),
723 mad->data, &rec);
724 query->callback(status, &rec, query->context);
725 } else
726 query->callback(status, NULL, query->context);
727 }
728
729 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query)
730 {
731 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query));
732 }
733
734 /**
735 * ib_sa_service_rec_query - Start Service Record operation
736 * @client:SA client
737 * @device:device to send request on
738 * @port_num: port number to send request on
739 * @method:SA method - should be get, set, or delete
740 * @rec:Service Record to send in request
741 * @comp_mask:component mask to send in request
742 * @timeout_ms:time to wait for response
743 * @gfp_mask:GFP mask to use for internal allocations
744 * @callback:function called when request completes, times out or is
745 * canceled
746 * @context:opaque user context passed to callback
747 * @sa_query:request context, used to cancel request
748 *
749 * Send a Service Record set/get/delete to the SA to register,
750 * unregister or query a service record.
751 * The callback function will be called when the request completes (or
752 * fails); status is 0 for a successful response, -EINTR if the query
753 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
754 * occurred sending the query. The resp parameter of the callback is
755 * only valid if status is 0.
756 *
757 * If the return value of ib_sa_service_rec_query() is negative, it is an
758 * error code. Otherwise it is a request ID that can be used to cancel
759 * the query.
760 */
761 int ib_sa_service_rec_query(struct ib_sa_client *client,
762 struct ib_device *device, u8 port_num, u8 method,
763 struct ib_sa_service_rec *rec,
764 ib_sa_comp_mask comp_mask,
765 int timeout_ms, gfp_t gfp_mask,
766 void (*callback)(int status,
767 struct ib_sa_service_rec *resp,
768 void *context),
769 void *context,
770 struct ib_sa_query **sa_query)
771 {
772 struct ib_sa_service_query *query;
773 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
774 struct ib_sa_port *port;
775 struct ib_mad_agent *agent;
776 struct ib_sa_mad *mad;
777 int ret;
778
779 if (!sa_dev)
780 return -ENODEV;
781
782 port = &sa_dev->port[port_num - sa_dev->start_port];
783 agent = port->agent;
784
785 if (method != IB_MGMT_METHOD_GET &&
786 method != IB_MGMT_METHOD_SET &&
787 method != IB_SA_METHOD_DELETE)
788 return -EINVAL;
789
790 query = kmalloc(sizeof *query, gfp_mask);
791 if (!query)
792 return -ENOMEM;
793
794 query->sa_query.port = port;
795 ret = alloc_mad(&query->sa_query, gfp_mask);
796 if (ret)
797 goto err1;
798
799 ib_sa_client_get(client);
800 query->sa_query.client = client;
801 query->callback = callback;
802 query->context = context;
803
804 mad = query->sa_query.mad_buf->mad;
805 init_mad(mad, agent);
806
807 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
808 query->sa_query.release = ib_sa_service_rec_release;
809 mad->mad_hdr.method = method;
810 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
811 mad->sa_hdr.comp_mask = comp_mask;
812
813 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table),
814 rec, mad->data);
815
816 *sa_query = &query->sa_query;
817
818 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
819 if (ret < 0)
820 goto err2;
821
822 return ret;
823
824 err2:
825 *sa_query = NULL;
826 ib_sa_client_put(query->sa_query.client);
827 free_mad(&query->sa_query);
828
829 err1:
830 kfree(query);
831 return ret;
832 }
833 EXPORT_SYMBOL(ib_sa_service_rec_query);
834
835 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
836 int status,
837 struct ib_sa_mad *mad)
838 {
839 struct ib_sa_mcmember_query *query =
840 container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
841
842 if (mad) {
843 struct ib_sa_mcmember_rec rec;
844
845 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
846 mad->data, &rec);
847 query->callback(status, &rec, query->context);
848 } else
849 query->callback(status, NULL, query->context);
850 }
851
852 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
853 {
854 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
855 }
856
857 int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
858 struct ib_device *device, u8 port_num,
859 u8 method,
860 struct ib_sa_mcmember_rec *rec,
861 ib_sa_comp_mask comp_mask,
862 int timeout_ms, gfp_t gfp_mask,
863 void (*callback)(int status,
864 struct ib_sa_mcmember_rec *resp,
865 void *context),
866 void *context,
867 struct ib_sa_query **sa_query)
868 {
869 struct ib_sa_mcmember_query *query;
870 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
871 struct ib_sa_port *port;
872 struct ib_mad_agent *agent;
873 struct ib_sa_mad *mad;
874 int ret;
875
876 if (!sa_dev)
877 return -ENODEV;
878
879 port = &sa_dev->port[port_num - sa_dev->start_port];
880 agent = port->agent;
881
882 query = kmalloc(sizeof *query, gfp_mask);
883 if (!query)
884 return -ENOMEM;
885
886 query->sa_query.port = port;
887 ret = alloc_mad(&query->sa_query, gfp_mask);
888 if (ret)
889 goto err1;
890
891 ib_sa_client_get(client);
892 query->sa_query.client = client;
893 query->callback = callback;
894 query->context = context;
895
896 mad = query->sa_query.mad_buf->mad;
897 init_mad(mad, agent);
898
899 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
900 query->sa_query.release = ib_sa_mcmember_rec_release;
901 mad->mad_hdr.method = method;
902 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
903 mad->sa_hdr.comp_mask = comp_mask;
904
905 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
906 rec, mad->data);
907
908 *sa_query = &query->sa_query;
909
910 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
911 if (ret < 0)
912 goto err2;
913
914 return ret;
915
916 err2:
917 *sa_query = NULL;
918 ib_sa_client_put(query->sa_query.client);
919 free_mad(&query->sa_query);
920
921 err1:
922 kfree(query);
923 return ret;
924 }
925
926 static void send_handler(struct ib_mad_agent *agent,
927 struct ib_mad_send_wc *mad_send_wc)
928 {
929 struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
930 unsigned long flags;
931
932 if (query->callback)
933 switch (mad_send_wc->status) {
934 case IB_WC_SUCCESS:
935 /* No callback -- already got recv */
936 break;
937 case IB_WC_RESP_TIMEOUT_ERR:
938 query->callback(query, -ETIMEDOUT, NULL);
939 break;
940 case IB_WC_WR_FLUSH_ERR:
941 query->callback(query, -EINTR, NULL);
942 break;
943 default:
944 query->callback(query, -EIO, NULL);
945 break;
946 }
947
948 spin_lock_irqsave(&idr_lock, flags);
949 idr_remove(&query_idr, query->id);
950 spin_unlock_irqrestore(&idr_lock, flags);
951
952 free_mad(query);
953 ib_sa_client_put(query->client);
954 query->release(query);
955 }
956
957 static void recv_handler(struct ib_mad_agent *mad_agent,
958 struct ib_mad_recv_wc *mad_recv_wc)
959 {
960 struct ib_sa_query *query;
961 struct ib_mad_send_buf *mad_buf;
962
963 mad_buf = (void *) (unsigned long) mad_recv_wc->wc->wr_id;
964 query = mad_buf->context[0];
965
966 if (query->callback) {
967 if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
968 query->callback(query,
969 mad_recv_wc->recv_buf.mad->mad_hdr.status ?
970 -EINVAL : 0,
971 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
972 else
973 query->callback(query, -EIO, NULL);
974 }
975
976 ib_free_recv_mad(mad_recv_wc);
977 }
978
979 static void ib_sa_add_one(struct ib_device *device)
980 {
981 struct ib_sa_device *sa_dev;
982 int s, e, i;
983
984 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
985 return;
986
987 if (device->node_type == RDMA_NODE_IB_SWITCH)
988 s = e = 0;
989 else {
990 s = 1;
991 e = device->phys_port_cnt;
992 }
993
994 sa_dev = kmalloc(sizeof *sa_dev +
995 (e - s + 1) * sizeof (struct ib_sa_port),
996 GFP_KERNEL);
997 if (!sa_dev)
998 return;
999
1000 sa_dev->start_port = s;
1001 sa_dev->end_port = e;
1002
1003 for (i = 0; i <= e - s; ++i) {
1004 sa_dev->port[i].sm_ah = NULL;
1005 sa_dev->port[i].port_num = i + s;
1006 spin_lock_init(&sa_dev->port[i].ah_lock);
1007
1008 sa_dev->port[i].agent =
1009 ib_register_mad_agent(device, i + s, IB_QPT_GSI,
1010 NULL, 0, send_handler,
1011 recv_handler, sa_dev);
1012 if (IS_ERR(sa_dev->port[i].agent))
1013 goto err;
1014
1015 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah);
1016 }
1017
1018 ib_set_client_data(device, &sa_client, sa_dev);
1019
1020 /*
1021 * We register our event handler after everything is set up,
1022 * and then update our cached info after the event handler is
1023 * registered to avoid any problems if a port changes state
1024 * during our initialization.
1025 */
1026
1027 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
1028 if (ib_register_event_handler(&sa_dev->event_handler))
1029 goto err;
1030
1031 for (i = 0; i <= e - s; ++i)
1032 update_sm_ah(&sa_dev->port[i].update_task);
1033
1034 return;
1035
1036 err:
1037 while (--i >= 0)
1038 ib_unregister_mad_agent(sa_dev->port[i].agent);
1039
1040 kfree(sa_dev);
1041
1042 return;
1043 }
1044
1045 static void ib_sa_remove_one(struct ib_device *device)
1046 {
1047 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1048 int i;
1049
1050 if (!sa_dev)
1051 return;
1052
1053 ib_unregister_event_handler(&sa_dev->event_handler);
1054
1055 flush_scheduled_work();
1056
1057 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
1058 ib_unregister_mad_agent(sa_dev->port[i].agent);
1059 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
1060 }
1061
1062 kfree(sa_dev);
1063 }
1064
1065 static int __init ib_sa_init(void)
1066 {
1067 int ret;
1068
1069 spin_lock_init(&idr_lock);
1070 spin_lock_init(&tid_lock);
1071
1072 get_random_bytes(&tid, sizeof tid);
1073
1074 ret = ib_register_client(&sa_client);
1075 if (ret) {
1076 printk(KERN_ERR "Couldn't register ib_sa client\n");
1077 goto err1;
1078 }
1079
1080 ret = mcast_init();
1081 if (ret) {
1082 printk(KERN_ERR "Couldn't initialize multicast handling\n");
1083 goto err2;
1084 }
1085
1086 return 0;
1087 err2:
1088 ib_unregister_client(&sa_client);
1089 err1:
1090 return ret;
1091 }
1092
1093 static void __exit ib_sa_cleanup(void)
1094 {
1095 mcast_cleanup();
1096 ib_unregister_client(&sa_client);
1097 idr_destroy(&query_idr);
1098 }
1099
1100 module_init(ib_sa_init);
1101 module_exit(ib_sa_cleanup);
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