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Merge branch 'linus' into core/softlockup
[mirror_ubuntu-hirsute-kernel.git] / drivers / infiniband / core / sa_query.c
1 /*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
4 * Copyright (c) 2006 Intel Corporation. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 */
34
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/err.h>
38 #include <linux/random.h>
39 #include <linux/spinlock.h>
40 #include <linux/slab.h>
41 #include <linux/dma-mapping.h>
42 #include <linux/kref.h>
43 #include <linux/idr.h>
44 #include <linux/workqueue.h>
45
46 #include <rdma/ib_pack.h>
47 #include <rdma/ib_cache.h>
48 #include "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 u16 pkey_index;
58 u8 src_path_mask;
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_client *client;
79 struct ib_sa_port *port;
80 struct ib_mad_send_buf *mad_buf;
81 struct ib_sa_sm_ah *sm_ah;
82 int id;
83 };
84
85 struct ib_sa_service_query {
86 void (*callback)(int, struct ib_sa_service_rec *, void *);
87 void *context;
88 struct ib_sa_query sa_query;
89 };
90
91 struct ib_sa_path_query {
92 void (*callback)(int, struct ib_sa_path_rec *, void *);
93 void *context;
94 struct ib_sa_query sa_query;
95 };
96
97 struct ib_sa_mcmember_query {
98 void (*callback)(int, struct ib_sa_mcmember_rec *, void *);
99 void *context;
100 struct ib_sa_query sa_query;
101 };
102
103 static void ib_sa_add_one(struct ib_device *device);
104 static void ib_sa_remove_one(struct ib_device *device);
105
106 static struct ib_client sa_client = {
107 .name = "sa",
108 .add = ib_sa_add_one,
109 .remove = ib_sa_remove_one
110 };
111
112 static spinlock_t idr_lock;
113 static DEFINE_IDR(query_idr);
114
115 static spinlock_t tid_lock;
116 static u32 tid;
117
118 #define PATH_REC_FIELD(field) \
119 .struct_offset_bytes = offsetof(struct ib_sa_path_rec, field), \
120 .struct_size_bytes = sizeof ((struct ib_sa_path_rec *) 0)->field, \
121 .field_name = "sa_path_rec:" #field
122
123 static const struct ib_field path_rec_table[] = {
124 { PATH_REC_FIELD(service_id),
125 .offset_words = 0,
126 .offset_bits = 0,
127 .size_bits = 64 },
128 { PATH_REC_FIELD(dgid),
129 .offset_words = 2,
130 .offset_bits = 0,
131 .size_bits = 128 },
132 { PATH_REC_FIELD(sgid),
133 .offset_words = 6,
134 .offset_bits = 0,
135 .size_bits = 128 },
136 { PATH_REC_FIELD(dlid),
137 .offset_words = 10,
138 .offset_bits = 0,
139 .size_bits = 16 },
140 { PATH_REC_FIELD(slid),
141 .offset_words = 10,
142 .offset_bits = 16,
143 .size_bits = 16 },
144 { PATH_REC_FIELD(raw_traffic),
145 .offset_words = 11,
146 .offset_bits = 0,
147 .size_bits = 1 },
148 { RESERVED,
149 .offset_words = 11,
150 .offset_bits = 1,
151 .size_bits = 3 },
152 { PATH_REC_FIELD(flow_label),
153 .offset_words = 11,
154 .offset_bits = 4,
155 .size_bits = 20 },
156 { PATH_REC_FIELD(hop_limit),
157 .offset_words = 11,
158 .offset_bits = 24,
159 .size_bits = 8 },
160 { PATH_REC_FIELD(traffic_class),
161 .offset_words = 12,
162 .offset_bits = 0,
163 .size_bits = 8 },
164 { PATH_REC_FIELD(reversible),
165 .offset_words = 12,
166 .offset_bits = 8,
167 .size_bits = 1 },
168 { PATH_REC_FIELD(numb_path),
169 .offset_words = 12,
170 .offset_bits = 9,
171 .size_bits = 7 },
172 { PATH_REC_FIELD(pkey),
173 .offset_words = 12,
174 .offset_bits = 16,
175 .size_bits = 16 },
176 { PATH_REC_FIELD(qos_class),
177 .offset_words = 13,
178 .offset_bits = 0,
179 .size_bits = 12 },
180 { PATH_REC_FIELD(sl),
181 .offset_words = 13,
182 .offset_bits = 12,
183 .size_bits = 4 },
184 { PATH_REC_FIELD(mtu_selector),
185 .offset_words = 13,
186 .offset_bits = 16,
187 .size_bits = 2 },
188 { PATH_REC_FIELD(mtu),
189 .offset_words = 13,
190 .offset_bits = 18,
191 .size_bits = 6 },
192 { PATH_REC_FIELD(rate_selector),
193 .offset_words = 13,
194 .offset_bits = 24,
195 .size_bits = 2 },
196 { PATH_REC_FIELD(rate),
197 .offset_words = 13,
198 .offset_bits = 26,
199 .size_bits = 6 },
200 { PATH_REC_FIELD(packet_life_time_selector),
201 .offset_words = 14,
202 .offset_bits = 0,
203 .size_bits = 2 },
204 { PATH_REC_FIELD(packet_life_time),
205 .offset_words = 14,
206 .offset_bits = 2,
207 .size_bits = 6 },
208 { PATH_REC_FIELD(preference),
209 .offset_words = 14,
210 .offset_bits = 8,
211 .size_bits = 8 },
212 { RESERVED,
213 .offset_words = 14,
214 .offset_bits = 16,
215 .size_bits = 48 },
216 };
217
218 #define MCMEMBER_REC_FIELD(field) \
219 .struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field), \
220 .struct_size_bytes = sizeof ((struct ib_sa_mcmember_rec *) 0)->field, \
221 .field_name = "sa_mcmember_rec:" #field
222
223 static const struct ib_field mcmember_rec_table[] = {
224 { MCMEMBER_REC_FIELD(mgid),
225 .offset_words = 0,
226 .offset_bits = 0,
227 .size_bits = 128 },
228 { MCMEMBER_REC_FIELD(port_gid),
229 .offset_words = 4,
230 .offset_bits = 0,
231 .size_bits = 128 },
232 { MCMEMBER_REC_FIELD(qkey),
233 .offset_words = 8,
234 .offset_bits = 0,
235 .size_bits = 32 },
236 { MCMEMBER_REC_FIELD(mlid),
237 .offset_words = 9,
238 .offset_bits = 0,
239 .size_bits = 16 },
240 { MCMEMBER_REC_FIELD(mtu_selector),
241 .offset_words = 9,
242 .offset_bits = 16,
243 .size_bits = 2 },
244 { MCMEMBER_REC_FIELD(mtu),
245 .offset_words = 9,
246 .offset_bits = 18,
247 .size_bits = 6 },
248 { MCMEMBER_REC_FIELD(traffic_class),
249 .offset_words = 9,
250 .offset_bits = 24,
251 .size_bits = 8 },
252 { MCMEMBER_REC_FIELD(pkey),
253 .offset_words = 10,
254 .offset_bits = 0,
255 .size_bits = 16 },
256 { MCMEMBER_REC_FIELD(rate_selector),
257 .offset_words = 10,
258 .offset_bits = 16,
259 .size_bits = 2 },
260 { MCMEMBER_REC_FIELD(rate),
261 .offset_words = 10,
262 .offset_bits = 18,
263 .size_bits = 6 },
264 { MCMEMBER_REC_FIELD(packet_life_time_selector),
265 .offset_words = 10,
266 .offset_bits = 24,
267 .size_bits = 2 },
268 { MCMEMBER_REC_FIELD(packet_life_time),
269 .offset_words = 10,
270 .offset_bits = 26,
271 .size_bits = 6 },
272 { MCMEMBER_REC_FIELD(sl),
273 .offset_words = 11,
274 .offset_bits = 0,
275 .size_bits = 4 },
276 { MCMEMBER_REC_FIELD(flow_label),
277 .offset_words = 11,
278 .offset_bits = 4,
279 .size_bits = 20 },
280 { MCMEMBER_REC_FIELD(hop_limit),
281 .offset_words = 11,
282 .offset_bits = 24,
283 .size_bits = 8 },
284 { MCMEMBER_REC_FIELD(scope),
285 .offset_words = 12,
286 .offset_bits = 0,
287 .size_bits = 4 },
288 { MCMEMBER_REC_FIELD(join_state),
289 .offset_words = 12,
290 .offset_bits = 4,
291 .size_bits = 4 },
292 { MCMEMBER_REC_FIELD(proxy_join),
293 .offset_words = 12,
294 .offset_bits = 8,
295 .size_bits = 1 },
296 { RESERVED,
297 .offset_words = 12,
298 .offset_bits = 9,
299 .size_bits = 23 },
300 };
301
302 #define SERVICE_REC_FIELD(field) \
303 .struct_offset_bytes = offsetof(struct ib_sa_service_rec, field), \
304 .struct_size_bytes = sizeof ((struct ib_sa_service_rec *) 0)->field, \
305 .field_name = "sa_service_rec:" #field
306
307 static const struct ib_field service_rec_table[] = {
308 { SERVICE_REC_FIELD(id),
309 .offset_words = 0,
310 .offset_bits = 0,
311 .size_bits = 64 },
312 { SERVICE_REC_FIELD(gid),
313 .offset_words = 2,
314 .offset_bits = 0,
315 .size_bits = 128 },
316 { SERVICE_REC_FIELD(pkey),
317 .offset_words = 6,
318 .offset_bits = 0,
319 .size_bits = 16 },
320 { SERVICE_REC_FIELD(lease),
321 .offset_words = 7,
322 .offset_bits = 0,
323 .size_bits = 32 },
324 { SERVICE_REC_FIELD(key),
325 .offset_words = 8,
326 .offset_bits = 0,
327 .size_bits = 128 },
328 { SERVICE_REC_FIELD(name),
329 .offset_words = 12,
330 .offset_bits = 0,
331 .size_bits = 64*8 },
332 { SERVICE_REC_FIELD(data8),
333 .offset_words = 28,
334 .offset_bits = 0,
335 .size_bits = 16*8 },
336 { SERVICE_REC_FIELD(data16),
337 .offset_words = 32,
338 .offset_bits = 0,
339 .size_bits = 8*16 },
340 { SERVICE_REC_FIELD(data32),
341 .offset_words = 36,
342 .offset_bits = 0,
343 .size_bits = 4*32 },
344 { SERVICE_REC_FIELD(data64),
345 .offset_words = 40,
346 .offset_bits = 0,
347 .size_bits = 2*64 },
348 };
349
350 static void free_sm_ah(struct kref *kref)
351 {
352 struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref);
353
354 ib_destroy_ah(sm_ah->ah);
355 kfree(sm_ah);
356 }
357
358 static void update_sm_ah(struct work_struct *work)
359 {
360 struct ib_sa_port *port =
361 container_of(work, struct ib_sa_port, update_task);
362 struct ib_sa_sm_ah *new_ah;
363 struct ib_port_attr port_attr;
364 struct ib_ah_attr ah_attr;
365
366 if (ib_query_port(port->agent->device, port->port_num, &port_attr)) {
367 printk(KERN_WARNING "Couldn't query port\n");
368 return;
369 }
370
371 new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL);
372 if (!new_ah) {
373 printk(KERN_WARNING "Couldn't allocate new SM AH\n");
374 return;
375 }
376
377 kref_init(&new_ah->ref);
378 new_ah->src_path_mask = (1 << port_attr.lmc) - 1;
379
380 new_ah->pkey_index = 0;
381 if (ib_find_pkey(port->agent->device, port->port_num,
382 IB_DEFAULT_PKEY_FULL, &new_ah->pkey_index))
383 printk(KERN_ERR "Couldn't find index for default PKey\n");
384
385 memset(&ah_attr, 0, sizeof ah_attr);
386 ah_attr.dlid = port_attr.sm_lid;
387 ah_attr.sl = port_attr.sm_sl;
388 ah_attr.port_num = port->port_num;
389
390 new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr);
391 if (IS_ERR(new_ah->ah)) {
392 printk(KERN_WARNING "Couldn't create new SM AH\n");
393 kfree(new_ah);
394 return;
395 }
396
397 spin_lock_irq(&port->ah_lock);
398 port->sm_ah = new_ah;
399 spin_unlock_irq(&port->ah_lock);
400
401 }
402
403 static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event)
404 {
405 if (event->event == IB_EVENT_PORT_ERR ||
406 event->event == IB_EVENT_PORT_ACTIVE ||
407 event->event == IB_EVENT_LID_CHANGE ||
408 event->event == IB_EVENT_PKEY_CHANGE ||
409 event->event == IB_EVENT_SM_CHANGE ||
410 event->event == IB_EVENT_CLIENT_REREGISTER) {
411 unsigned long flags;
412 struct ib_sa_device *sa_dev =
413 container_of(handler, typeof(*sa_dev), event_handler);
414 struct ib_sa_port *port =
415 &sa_dev->port[event->element.port_num - sa_dev->start_port];
416
417 spin_lock_irqsave(&port->ah_lock, flags);
418 if (port->sm_ah)
419 kref_put(&port->sm_ah->ref, free_sm_ah);
420 port->sm_ah = NULL;
421 spin_unlock_irqrestore(&port->ah_lock, flags);
422
423 schedule_work(&sa_dev->port[event->element.port_num -
424 sa_dev->start_port].update_task);
425 }
426 }
427
428 void ib_sa_register_client(struct ib_sa_client *client)
429 {
430 atomic_set(&client->users, 1);
431 init_completion(&client->comp);
432 }
433 EXPORT_SYMBOL(ib_sa_register_client);
434
435 void ib_sa_unregister_client(struct ib_sa_client *client)
436 {
437 ib_sa_client_put(client);
438 wait_for_completion(&client->comp);
439 }
440 EXPORT_SYMBOL(ib_sa_unregister_client);
441
442 /**
443 * ib_sa_cancel_query - try to cancel an SA query
444 * @id:ID of query to cancel
445 * @query:query pointer to cancel
446 *
447 * Try to cancel an SA query. If the id and query don't match up or
448 * the query has already completed, nothing is done. Otherwise the
449 * query is canceled and will complete with a status of -EINTR.
450 */
451 void ib_sa_cancel_query(int id, struct ib_sa_query *query)
452 {
453 unsigned long flags;
454 struct ib_mad_agent *agent;
455 struct ib_mad_send_buf *mad_buf;
456
457 spin_lock_irqsave(&idr_lock, flags);
458 if (idr_find(&query_idr, id) != query) {
459 spin_unlock_irqrestore(&idr_lock, flags);
460 return;
461 }
462 agent = query->port->agent;
463 mad_buf = query->mad_buf;
464 spin_unlock_irqrestore(&idr_lock, flags);
465
466 ib_cancel_mad(agent, mad_buf);
467 }
468 EXPORT_SYMBOL(ib_sa_cancel_query);
469
470 static u8 get_src_path_mask(struct ib_device *device, u8 port_num)
471 {
472 struct ib_sa_device *sa_dev;
473 struct ib_sa_port *port;
474 unsigned long flags;
475 u8 src_path_mask;
476
477 sa_dev = ib_get_client_data(device, &sa_client);
478 if (!sa_dev)
479 return 0x7f;
480
481 port = &sa_dev->port[port_num - sa_dev->start_port];
482 spin_lock_irqsave(&port->ah_lock, flags);
483 src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f;
484 spin_unlock_irqrestore(&port->ah_lock, flags);
485
486 return src_path_mask;
487 }
488
489 int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
490 struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr)
491 {
492 int ret;
493 u16 gid_index;
494
495 memset(ah_attr, 0, sizeof *ah_attr);
496 ah_attr->dlid = be16_to_cpu(rec->dlid);
497 ah_attr->sl = rec->sl;
498 ah_attr->src_path_bits = be16_to_cpu(rec->slid) &
499 get_src_path_mask(device, port_num);
500 ah_attr->port_num = port_num;
501 ah_attr->static_rate = rec->rate;
502
503 if (rec->hop_limit > 1) {
504 ah_attr->ah_flags = IB_AH_GRH;
505 ah_attr->grh.dgid = rec->dgid;
506
507 ret = ib_find_cached_gid(device, &rec->sgid, &port_num,
508 &gid_index);
509 if (ret)
510 return ret;
511
512 ah_attr->grh.sgid_index = gid_index;
513 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
514 ah_attr->grh.hop_limit = rec->hop_limit;
515 ah_attr->grh.traffic_class = rec->traffic_class;
516 }
517 return 0;
518 }
519 EXPORT_SYMBOL(ib_init_ah_from_path);
520
521 static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask)
522 {
523 unsigned long flags;
524
525 spin_lock_irqsave(&query->port->ah_lock, flags);
526 if (!query->port->sm_ah) {
527 spin_unlock_irqrestore(&query->port->ah_lock, flags);
528 return -EAGAIN;
529 }
530 kref_get(&query->port->sm_ah->ref);
531 query->sm_ah = query->port->sm_ah;
532 spin_unlock_irqrestore(&query->port->ah_lock, flags);
533
534 query->mad_buf = ib_create_send_mad(query->port->agent, 1,
535 query->sm_ah->pkey_index,
536 0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA,
537 gfp_mask);
538 if (IS_ERR(query->mad_buf)) {
539 kref_put(&query->sm_ah->ref, free_sm_ah);
540 return -ENOMEM;
541 }
542
543 query->mad_buf->ah = query->sm_ah->ah;
544
545 return 0;
546 }
547
548 static void free_mad(struct ib_sa_query *query)
549 {
550 ib_free_send_mad(query->mad_buf);
551 kref_put(&query->sm_ah->ref, free_sm_ah);
552 }
553
554 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
555 {
556 unsigned long flags;
557
558 memset(mad, 0, sizeof *mad);
559
560 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION;
561 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
562 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
563
564 spin_lock_irqsave(&tid_lock, flags);
565 mad->mad_hdr.tid =
566 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
567 spin_unlock_irqrestore(&tid_lock, flags);
568 }
569
570 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask)
571 {
572 unsigned long flags;
573 int ret, id;
574
575 retry:
576 if (!idr_pre_get(&query_idr, gfp_mask))
577 return -ENOMEM;
578 spin_lock_irqsave(&idr_lock, flags);
579 ret = idr_get_new(&query_idr, query, &id);
580 spin_unlock_irqrestore(&idr_lock, flags);
581 if (ret == -EAGAIN)
582 goto retry;
583 if (ret)
584 return ret;
585
586 query->mad_buf->timeout_ms = timeout_ms;
587 query->mad_buf->context[0] = query;
588 query->id = id;
589
590 ret = ib_post_send_mad(query->mad_buf, NULL);
591 if (ret) {
592 spin_lock_irqsave(&idr_lock, flags);
593 idr_remove(&query_idr, id);
594 spin_unlock_irqrestore(&idr_lock, flags);
595 }
596
597 /*
598 * It's not safe to dereference query any more, because the
599 * send may already have completed and freed the query in
600 * another context.
601 */
602 return ret ? ret : id;
603 }
604
605 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
606 int status,
607 struct ib_sa_mad *mad)
608 {
609 struct ib_sa_path_query *query =
610 container_of(sa_query, struct ib_sa_path_query, sa_query);
611
612 if (mad) {
613 struct ib_sa_path_rec rec;
614
615 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
616 mad->data, &rec);
617 query->callback(status, &rec, query->context);
618 } else
619 query->callback(status, NULL, query->context);
620 }
621
622 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
623 {
624 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query));
625 }
626
627 /**
628 * ib_sa_path_rec_get - Start a Path get query
629 * @client:SA client
630 * @device:device to send query on
631 * @port_num: port number to send query on
632 * @rec:Path Record to send in query
633 * @comp_mask:component mask to send in query
634 * @timeout_ms:time to wait for response
635 * @gfp_mask:GFP mask to use for internal allocations
636 * @callback:function called when query completes, times out or is
637 * canceled
638 * @context:opaque user context passed to callback
639 * @sa_query:query context, used to cancel query
640 *
641 * Send a Path Record Get query to the SA to look up a path. The
642 * callback function will be called when the query completes (or
643 * fails); status is 0 for a successful response, -EINTR if the query
644 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
645 * occurred sending the query. The resp parameter of the callback is
646 * only valid if status is 0.
647 *
648 * If the return value of ib_sa_path_rec_get() is negative, it is an
649 * error code. Otherwise it is a query ID that can be used to cancel
650 * the query.
651 */
652 int ib_sa_path_rec_get(struct ib_sa_client *client,
653 struct ib_device *device, u8 port_num,
654 struct ib_sa_path_rec *rec,
655 ib_sa_comp_mask comp_mask,
656 int timeout_ms, gfp_t gfp_mask,
657 void (*callback)(int status,
658 struct ib_sa_path_rec *resp,
659 void *context),
660 void *context,
661 struct ib_sa_query **sa_query)
662 {
663 struct ib_sa_path_query *query;
664 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
665 struct ib_sa_port *port;
666 struct ib_mad_agent *agent;
667 struct ib_sa_mad *mad;
668 int ret;
669
670 if (!sa_dev)
671 return -ENODEV;
672
673 port = &sa_dev->port[port_num - sa_dev->start_port];
674 agent = port->agent;
675
676 query = kmalloc(sizeof *query, gfp_mask);
677 if (!query)
678 return -ENOMEM;
679
680 query->sa_query.port = port;
681 ret = alloc_mad(&query->sa_query, gfp_mask);
682 if (ret)
683 goto err1;
684
685 ib_sa_client_get(client);
686 query->sa_query.client = client;
687 query->callback = callback;
688 query->context = context;
689
690 mad = query->sa_query.mad_buf->mad;
691 init_mad(mad, agent);
692
693 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
694 query->sa_query.release = ib_sa_path_rec_release;
695 mad->mad_hdr.method = IB_MGMT_METHOD_GET;
696 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC);
697 mad->sa_hdr.comp_mask = comp_mask;
698
699 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data);
700
701 *sa_query = &query->sa_query;
702
703 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
704 if (ret < 0)
705 goto err2;
706
707 return ret;
708
709 err2:
710 *sa_query = NULL;
711 ib_sa_client_put(query->sa_query.client);
712 free_mad(&query->sa_query);
713
714 err1:
715 kfree(query);
716 return ret;
717 }
718 EXPORT_SYMBOL(ib_sa_path_rec_get);
719
720 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query,
721 int status,
722 struct ib_sa_mad *mad)
723 {
724 struct ib_sa_service_query *query =
725 container_of(sa_query, struct ib_sa_service_query, sa_query);
726
727 if (mad) {
728 struct ib_sa_service_rec rec;
729
730 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table),
731 mad->data, &rec);
732 query->callback(status, &rec, query->context);
733 } else
734 query->callback(status, NULL, query->context);
735 }
736
737 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query)
738 {
739 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query));
740 }
741
742 /**
743 * ib_sa_service_rec_query - Start Service Record operation
744 * @client:SA client
745 * @device:device to send request on
746 * @port_num: port number to send request on
747 * @method:SA method - should be get, set, or delete
748 * @rec:Service Record to send in request
749 * @comp_mask:component mask to send in request
750 * @timeout_ms:time to wait for response
751 * @gfp_mask:GFP mask to use for internal allocations
752 * @callback:function called when request completes, times out or is
753 * canceled
754 * @context:opaque user context passed to callback
755 * @sa_query:request context, used to cancel request
756 *
757 * Send a Service Record set/get/delete to the SA to register,
758 * unregister or query a service record.
759 * The callback function will be called when the request completes (or
760 * fails); status is 0 for a successful response, -EINTR if the query
761 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
762 * occurred sending the query. The resp parameter of the callback is
763 * only valid if status is 0.
764 *
765 * If the return value of ib_sa_service_rec_query() is negative, it is an
766 * error code. Otherwise it is a request ID that can be used to cancel
767 * the query.
768 */
769 int ib_sa_service_rec_query(struct ib_sa_client *client,
770 struct ib_device *device, u8 port_num, u8 method,
771 struct ib_sa_service_rec *rec,
772 ib_sa_comp_mask comp_mask,
773 int timeout_ms, gfp_t gfp_mask,
774 void (*callback)(int status,
775 struct ib_sa_service_rec *resp,
776 void *context),
777 void *context,
778 struct ib_sa_query **sa_query)
779 {
780 struct ib_sa_service_query *query;
781 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
782 struct ib_sa_port *port;
783 struct ib_mad_agent *agent;
784 struct ib_sa_mad *mad;
785 int ret;
786
787 if (!sa_dev)
788 return -ENODEV;
789
790 port = &sa_dev->port[port_num - sa_dev->start_port];
791 agent = port->agent;
792
793 if (method != IB_MGMT_METHOD_GET &&
794 method != IB_MGMT_METHOD_SET &&
795 method != IB_SA_METHOD_DELETE)
796 return -EINVAL;
797
798 query = kmalloc(sizeof *query, gfp_mask);
799 if (!query)
800 return -ENOMEM;
801
802 query->sa_query.port = port;
803 ret = alloc_mad(&query->sa_query, gfp_mask);
804 if (ret)
805 goto err1;
806
807 ib_sa_client_get(client);
808 query->sa_query.client = client;
809 query->callback = callback;
810 query->context = context;
811
812 mad = query->sa_query.mad_buf->mad;
813 init_mad(mad, agent);
814
815 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
816 query->sa_query.release = ib_sa_service_rec_release;
817 mad->mad_hdr.method = method;
818 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
819 mad->sa_hdr.comp_mask = comp_mask;
820
821 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table),
822 rec, mad->data);
823
824 *sa_query = &query->sa_query;
825
826 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
827 if (ret < 0)
828 goto err2;
829
830 return ret;
831
832 err2:
833 *sa_query = NULL;
834 ib_sa_client_put(query->sa_query.client);
835 free_mad(&query->sa_query);
836
837 err1:
838 kfree(query);
839 return ret;
840 }
841 EXPORT_SYMBOL(ib_sa_service_rec_query);
842
843 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
844 int status,
845 struct ib_sa_mad *mad)
846 {
847 struct ib_sa_mcmember_query *query =
848 container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
849
850 if (mad) {
851 struct ib_sa_mcmember_rec rec;
852
853 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
854 mad->data, &rec);
855 query->callback(status, &rec, query->context);
856 } else
857 query->callback(status, NULL, query->context);
858 }
859
860 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
861 {
862 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
863 }
864
865 int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
866 struct ib_device *device, u8 port_num,
867 u8 method,
868 struct ib_sa_mcmember_rec *rec,
869 ib_sa_comp_mask comp_mask,
870 int timeout_ms, gfp_t gfp_mask,
871 void (*callback)(int status,
872 struct ib_sa_mcmember_rec *resp,
873 void *context),
874 void *context,
875 struct ib_sa_query **sa_query)
876 {
877 struct ib_sa_mcmember_query *query;
878 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
879 struct ib_sa_port *port;
880 struct ib_mad_agent *agent;
881 struct ib_sa_mad *mad;
882 int ret;
883
884 if (!sa_dev)
885 return -ENODEV;
886
887 port = &sa_dev->port[port_num - sa_dev->start_port];
888 agent = port->agent;
889
890 query = kmalloc(sizeof *query, gfp_mask);
891 if (!query)
892 return -ENOMEM;
893
894 query->sa_query.port = port;
895 ret = alloc_mad(&query->sa_query, gfp_mask);
896 if (ret)
897 goto err1;
898
899 ib_sa_client_get(client);
900 query->sa_query.client = client;
901 query->callback = callback;
902 query->context = context;
903
904 mad = query->sa_query.mad_buf->mad;
905 init_mad(mad, agent);
906
907 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
908 query->sa_query.release = ib_sa_mcmember_rec_release;
909 mad->mad_hdr.method = method;
910 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
911 mad->sa_hdr.comp_mask = comp_mask;
912
913 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
914 rec, mad->data);
915
916 *sa_query = &query->sa_query;
917
918 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
919 if (ret < 0)
920 goto err2;
921
922 return ret;
923
924 err2:
925 *sa_query = NULL;
926 ib_sa_client_put(query->sa_query.client);
927 free_mad(&query->sa_query);
928
929 err1:
930 kfree(query);
931 return ret;
932 }
933
934 static void send_handler(struct ib_mad_agent *agent,
935 struct ib_mad_send_wc *mad_send_wc)
936 {
937 struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
938 unsigned long flags;
939
940 if (query->callback)
941 switch (mad_send_wc->status) {
942 case IB_WC_SUCCESS:
943 /* No callback -- already got recv */
944 break;
945 case IB_WC_RESP_TIMEOUT_ERR:
946 query->callback(query, -ETIMEDOUT, NULL);
947 break;
948 case IB_WC_WR_FLUSH_ERR:
949 query->callback(query, -EINTR, NULL);
950 break;
951 default:
952 query->callback(query, -EIO, NULL);
953 break;
954 }
955
956 spin_lock_irqsave(&idr_lock, flags);
957 idr_remove(&query_idr, query->id);
958 spin_unlock_irqrestore(&idr_lock, flags);
959
960 free_mad(query);
961 ib_sa_client_put(query->client);
962 query->release(query);
963 }
964
965 static void recv_handler(struct ib_mad_agent *mad_agent,
966 struct ib_mad_recv_wc *mad_recv_wc)
967 {
968 struct ib_sa_query *query;
969 struct ib_mad_send_buf *mad_buf;
970
971 mad_buf = (void *) (unsigned long) mad_recv_wc->wc->wr_id;
972 query = mad_buf->context[0];
973
974 if (query->callback) {
975 if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
976 query->callback(query,
977 mad_recv_wc->recv_buf.mad->mad_hdr.status ?
978 -EINVAL : 0,
979 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
980 else
981 query->callback(query, -EIO, NULL);
982 }
983
984 ib_free_recv_mad(mad_recv_wc);
985 }
986
987 static void ib_sa_add_one(struct ib_device *device)
988 {
989 struct ib_sa_device *sa_dev;
990 int s, e, i;
991
992 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
993 return;
994
995 if (device->node_type == RDMA_NODE_IB_SWITCH)
996 s = e = 0;
997 else {
998 s = 1;
999 e = device->phys_port_cnt;
1000 }
1001
1002 sa_dev = kmalloc(sizeof *sa_dev +
1003 (e - s + 1) * sizeof (struct ib_sa_port),
1004 GFP_KERNEL);
1005 if (!sa_dev)
1006 return;
1007
1008 sa_dev->start_port = s;
1009 sa_dev->end_port = e;
1010
1011 for (i = 0; i <= e - s; ++i) {
1012 sa_dev->port[i].sm_ah = NULL;
1013 sa_dev->port[i].port_num = i + s;
1014 spin_lock_init(&sa_dev->port[i].ah_lock);
1015
1016 sa_dev->port[i].agent =
1017 ib_register_mad_agent(device, i + s, IB_QPT_GSI,
1018 NULL, 0, send_handler,
1019 recv_handler, sa_dev);
1020 if (IS_ERR(sa_dev->port[i].agent))
1021 goto err;
1022
1023 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah);
1024 }
1025
1026 ib_set_client_data(device, &sa_client, sa_dev);
1027
1028 /*
1029 * We register our event handler after everything is set up,
1030 * and then update our cached info after the event handler is
1031 * registered to avoid any problems if a port changes state
1032 * during our initialization.
1033 */
1034
1035 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
1036 if (ib_register_event_handler(&sa_dev->event_handler))
1037 goto err;
1038
1039 for (i = 0; i <= e - s; ++i)
1040 update_sm_ah(&sa_dev->port[i].update_task);
1041
1042 return;
1043
1044 err:
1045 while (--i >= 0)
1046 ib_unregister_mad_agent(sa_dev->port[i].agent);
1047
1048 kfree(sa_dev);
1049
1050 return;
1051 }
1052
1053 static void ib_sa_remove_one(struct ib_device *device)
1054 {
1055 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1056 int i;
1057
1058 if (!sa_dev)
1059 return;
1060
1061 ib_unregister_event_handler(&sa_dev->event_handler);
1062
1063 flush_scheduled_work();
1064
1065 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
1066 ib_unregister_mad_agent(sa_dev->port[i].agent);
1067 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
1068 }
1069
1070 kfree(sa_dev);
1071 }
1072
1073 static int __init ib_sa_init(void)
1074 {
1075 int ret;
1076
1077 spin_lock_init(&idr_lock);
1078 spin_lock_init(&tid_lock);
1079
1080 get_random_bytes(&tid, sizeof tid);
1081
1082 ret = ib_register_client(&sa_client);
1083 if (ret) {
1084 printk(KERN_ERR "Couldn't register ib_sa client\n");
1085 goto err1;
1086 }
1087
1088 ret = mcast_init();
1089 if (ret) {
1090 printk(KERN_ERR "Couldn't initialize multicast handling\n");
1091 goto err2;
1092 }
1093
1094 return 0;
1095 err2:
1096 ib_unregister_client(&sa_client);
1097 err1:
1098 return ret;
1099 }
1100
1101 static void __exit ib_sa_cleanup(void)
1102 {
1103 mcast_cleanup();
1104 ib_unregister_client(&sa_client);
1105 idr_destroy(&query_idr);
1106 }
1107
1108 module_init(ib_sa_init);
1109 module_exit(ib_sa_cleanup);
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