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x86/amd-iommu: Add per IOMMU reference counting
[linux/fpc-iii.git] / drivers / infiniband / core / sa_query.c
blob82543716d59ef74ce57029e03fd1e09aef6032a3
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 DEFINE_SPINLOCK(idr_lock);
113 static DEFINE_IDR(query_idr);
114
115 static DEFINE_SPINLOCK(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 if (port->sm_ah)
399 kref_put(&port->sm_ah->ref, free_sm_ah);
400 port->sm_ah = new_ah;
401 spin_unlock_irq(&port->ah_lock);
402
403 }
404
405 static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event)
406 {
407 if (event->event == IB_EVENT_PORT_ERR ||
408 event->event == IB_EVENT_PORT_ACTIVE ||
409 event->event == IB_EVENT_LID_CHANGE ||
410 event->event == IB_EVENT_PKEY_CHANGE ||
411 event->event == IB_EVENT_SM_CHANGE ||
412 event->event == IB_EVENT_CLIENT_REREGISTER) {
413 unsigned long flags;
414 struct ib_sa_device *sa_dev =
415 container_of(handler, typeof(*sa_dev), event_handler);
416 struct ib_sa_port *port =
417 &sa_dev->port[event->element.port_num - sa_dev->start_port];
418
419 spin_lock_irqsave(&port->ah_lock, flags);
420 if (port->sm_ah)
421 kref_put(&port->sm_ah->ref, free_sm_ah);
422 port->sm_ah = NULL;
423 spin_unlock_irqrestore(&port->ah_lock, flags);
424
425 schedule_work(&sa_dev->port[event->element.port_num -
426 sa_dev->start_port].update_task);
427 }
428 }
429
430 void ib_sa_register_client(struct ib_sa_client *client)
431 {
432 atomic_set(&client->users, 1);
433 init_completion(&client->comp);
434 }
435 EXPORT_SYMBOL(ib_sa_register_client);
436
437 void ib_sa_unregister_client(struct ib_sa_client *client)
438 {
439 ib_sa_client_put(client);
440 wait_for_completion(&client->comp);
441 }
442 EXPORT_SYMBOL(ib_sa_unregister_client);
443
444 /**
445 * ib_sa_cancel_query - try to cancel an SA query
446 * @id:ID of query to cancel
447 * @query:query pointer to cancel
448 *
449 * Try to cancel an SA query. If the id and query don't match up or
450 * the query has already completed, nothing is done. Otherwise the
451 * query is canceled and will complete with a status of -EINTR.
452 */
453 void ib_sa_cancel_query(int id, struct ib_sa_query *query)
454 {
455 unsigned long flags;
456 struct ib_mad_agent *agent;
457 struct ib_mad_send_buf *mad_buf;
458
459 spin_lock_irqsave(&idr_lock, flags);
460 if (idr_find(&query_idr, id) != query) {
461 spin_unlock_irqrestore(&idr_lock, flags);
462 return;
463 }
464 agent = query->port->agent;
465 mad_buf = query->mad_buf;
466 spin_unlock_irqrestore(&idr_lock, flags);
467
468 ib_cancel_mad(agent, mad_buf);
469 }
470 EXPORT_SYMBOL(ib_sa_cancel_query);
471
472 static u8 get_src_path_mask(struct ib_device *device, u8 port_num)
473 {
474 struct ib_sa_device *sa_dev;
475 struct ib_sa_port *port;
476 unsigned long flags;
477 u8 src_path_mask;
478
479 sa_dev = ib_get_client_data(device, &sa_client);
480 if (!sa_dev)
481 return 0x7f;
482
483 port = &sa_dev->port[port_num - sa_dev->start_port];
484 spin_lock_irqsave(&port->ah_lock, flags);
485 src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f;
486 spin_unlock_irqrestore(&port->ah_lock, flags);
487
488 return src_path_mask;
489 }
490
491 int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
492 struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr)
493 {
494 int ret;
495 u16 gid_index;
496
497 memset(ah_attr, 0, sizeof *ah_attr);
498 ah_attr->dlid = be16_to_cpu(rec->dlid);
499 ah_attr->sl = rec->sl;
500 ah_attr->src_path_bits = be16_to_cpu(rec->slid) &
501 get_src_path_mask(device, port_num);
502 ah_attr->port_num = port_num;
503 ah_attr->static_rate = rec->rate;
504
505 if (rec->hop_limit > 1) {
506 ah_attr->ah_flags = IB_AH_GRH;
507 ah_attr->grh.dgid = rec->dgid;
508
509 ret = ib_find_cached_gid(device, &rec->sgid, &port_num,
510 &gid_index);
511 if (ret)
512 return ret;
513
514 ah_attr->grh.sgid_index = gid_index;
515 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
516 ah_attr->grh.hop_limit = rec->hop_limit;
517 ah_attr->grh.traffic_class = rec->traffic_class;
518 }
519 return 0;
520 }
521 EXPORT_SYMBOL(ib_init_ah_from_path);
522
523 static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask)
524 {
525 unsigned long flags;
526
527 spin_lock_irqsave(&query->port->ah_lock, flags);
528 if (!query->port->sm_ah) {
529 spin_unlock_irqrestore(&query->port->ah_lock, flags);
530 return -EAGAIN;
531 }
532 kref_get(&query->port->sm_ah->ref);
533 query->sm_ah = query->port->sm_ah;
534 spin_unlock_irqrestore(&query->port->ah_lock, flags);
535
536 query->mad_buf = ib_create_send_mad(query->port->agent, 1,
537 query->sm_ah->pkey_index,
538 0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA,
539 gfp_mask);
540 if (IS_ERR(query->mad_buf)) {
541 kref_put(&query->sm_ah->ref, free_sm_ah);
542 return -ENOMEM;
543 }
544
545 query->mad_buf->ah = query->sm_ah->ah;
546
547 return 0;
548 }
549
550 static void free_mad(struct ib_sa_query *query)
551 {
552 ib_free_send_mad(query->mad_buf);
553 kref_put(&query->sm_ah->ref, free_sm_ah);
554 }
555
556 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
557 {
558 unsigned long flags;
559
560 memset(mad, 0, sizeof *mad);
561
562 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION;
563 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
564 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
565
566 spin_lock_irqsave(&tid_lock, flags);
567 mad->mad_hdr.tid =
568 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
569 spin_unlock_irqrestore(&tid_lock, flags);
570 }
571
572 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask)
573 {
574 unsigned long flags;
575 int ret, id;
576
577 retry:
578 if (!idr_pre_get(&query_idr, gfp_mask))
579 return -ENOMEM;
580 spin_lock_irqsave(&idr_lock, flags);
581 ret = idr_get_new(&query_idr, query, &id);
582 spin_unlock_irqrestore(&idr_lock, flags);
583 if (ret == -EAGAIN)
584 goto retry;
585 if (ret)
586 return ret;
587
588 query->mad_buf->timeout_ms = timeout_ms;
589 query->mad_buf->context[0] = query;
590 query->id = id;
591
592 ret = ib_post_send_mad(query->mad_buf, NULL);
593 if (ret) {
594 spin_lock_irqsave(&idr_lock, flags);
595 idr_remove(&query_idr, id);
596 spin_unlock_irqrestore(&idr_lock, flags);
597 }
598
599 /*
600 * It's not safe to dereference query any more, because the
601 * send may already have completed and freed the query in
602 * another context.
603 */
604 return ret ? ret : id;
605 }
606
607 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
608 int status,
609 struct ib_sa_mad *mad)
610 {
611 struct ib_sa_path_query *query =
612 container_of(sa_query, struct ib_sa_path_query, sa_query);
613
614 if (mad) {
615 struct ib_sa_path_rec rec;
616
617 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
618 mad->data, &rec);
619 query->callback(status, &rec, query->context);
620 } else
621 query->callback(status, NULL, query->context);
622 }
623
624 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
625 {
626 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query));
627 }
628
629 /**
630 * ib_sa_path_rec_get - Start a Path get query
631 * @client:SA client
632 * @device:device to send query on
633 * @port_num: port number to send query on
634 * @rec:Path Record to send in query
635 * @comp_mask:component mask to send in query
636 * @timeout_ms:time to wait for response
637 * @gfp_mask:GFP mask to use for internal allocations
638 * @callback:function called when query completes, times out or is
639 * canceled
640 * @context:opaque user context passed to callback
641 * @sa_query:query context, used to cancel query
642 *
643 * Send a Path Record Get query to the SA to look up a path. The
644 * callback function will be called when the query completes (or
645 * fails); status is 0 for a successful response, -EINTR if the query
646 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
647 * occurred sending the query. The resp parameter of the callback is
648 * only valid if status is 0.
649 *
650 * If the return value of ib_sa_path_rec_get() is negative, it is an
651 * error code. Otherwise it is a query ID that can be used to cancel
652 * the query.
653 */
654 int ib_sa_path_rec_get(struct ib_sa_client *client,
655 struct ib_device *device, u8 port_num,
656 struct ib_sa_path_rec *rec,
657 ib_sa_comp_mask comp_mask,
658 int timeout_ms, gfp_t gfp_mask,
659 void (*callback)(int status,
660 struct ib_sa_path_rec *resp,
661 void *context),
662 void *context,
663 struct ib_sa_query **sa_query)
664 {
665 struct ib_sa_path_query *query;
666 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
667 struct ib_sa_port *port;
668 struct ib_mad_agent *agent;
669 struct ib_sa_mad *mad;
670 int ret;
671
672 if (!sa_dev)
673 return -ENODEV;
674
675 port = &sa_dev->port[port_num - sa_dev->start_port];
676 agent = port->agent;
677
678 query = kmalloc(sizeof *query, gfp_mask);
679 if (!query)
680 return -ENOMEM;
681
682 query->sa_query.port = port;
683 ret = alloc_mad(&query->sa_query, gfp_mask);
684 if (ret)
685 goto err1;
686
687 ib_sa_client_get(client);
688 query->sa_query.client = client;
689 query->callback = callback;
690 query->context = context;
691
692 mad = query->sa_query.mad_buf->mad;
693 init_mad(mad, agent);
694
695 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
696 query->sa_query.release = ib_sa_path_rec_release;
697 mad->mad_hdr.method = IB_MGMT_METHOD_GET;
698 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC);
699 mad->sa_hdr.comp_mask = comp_mask;
700
701 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data);
702
703 *sa_query = &query->sa_query;
704
705 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
706 if (ret < 0)
707 goto err2;
708
709 return ret;
710
711 err2:
712 *sa_query = NULL;
713 ib_sa_client_put(query->sa_query.client);
714 free_mad(&query->sa_query);
715
716 err1:
717 kfree(query);
718 return ret;
719 }
720 EXPORT_SYMBOL(ib_sa_path_rec_get);
721
722 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query,
723 int status,
724 struct ib_sa_mad *mad)
725 {
726 struct ib_sa_service_query *query =
727 container_of(sa_query, struct ib_sa_service_query, sa_query);
728
729 if (mad) {
730 struct ib_sa_service_rec rec;
731
732 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table),
733 mad->data, &rec);
734 query->callback(status, &rec, query->context);
735 } else
736 query->callback(status, NULL, query->context);
737 }
738
739 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query)
740 {
741 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query));
742 }
743
744 /**
745 * ib_sa_service_rec_query - Start Service Record operation
746 * @client:SA client
747 * @device:device to send request on
748 * @port_num: port number to send request on
749 * @method:SA method - should be get, set, or delete
750 * @rec:Service Record to send in request
751 * @comp_mask:component mask to send in request
752 * @timeout_ms:time to wait for response
753 * @gfp_mask:GFP mask to use for internal allocations
754 * @callback:function called when request completes, times out or is
755 * canceled
756 * @context:opaque user context passed to callback
757 * @sa_query:request context, used to cancel request
758 *
759 * Send a Service Record set/get/delete to the SA to register,
760 * unregister or query a service record.
761 * The callback function will be called when the request completes (or
762 * fails); status is 0 for a successful response, -EINTR if the query
763 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
764 * occurred sending the query. The resp parameter of the callback is
765 * only valid if status is 0.
766 *
767 * If the return value of ib_sa_service_rec_query() is negative, it is an
768 * error code. Otherwise it is a request ID that can be used to cancel
769 * the query.
770 */
771 int ib_sa_service_rec_query(struct ib_sa_client *client,
772 struct ib_device *device, u8 port_num, u8 method,
773 struct ib_sa_service_rec *rec,
774 ib_sa_comp_mask comp_mask,
775 int timeout_ms, gfp_t gfp_mask,
776 void (*callback)(int status,
777 struct ib_sa_service_rec *resp,
778 void *context),
779 void *context,
780 struct ib_sa_query **sa_query)
781 {
782 struct ib_sa_service_query *query;
783 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
784 struct ib_sa_port *port;
785 struct ib_mad_agent *agent;
786 struct ib_sa_mad *mad;
787 int ret;
788
789 if (!sa_dev)
790 return -ENODEV;
791
792 port = &sa_dev->port[port_num - sa_dev->start_port];
793 agent = port->agent;
794
795 if (method != IB_MGMT_METHOD_GET &&
796 method != IB_MGMT_METHOD_SET &&
797 method != IB_SA_METHOD_DELETE)
798 return -EINVAL;
799
800 query = kmalloc(sizeof *query, gfp_mask);
801 if (!query)
802 return -ENOMEM;
803
804 query->sa_query.port = port;
805 ret = alloc_mad(&query->sa_query, gfp_mask);
806 if (ret)
807 goto err1;
808
809 ib_sa_client_get(client);
810 query->sa_query.client = client;
811 query->callback = callback;
812 query->context = context;
813
814 mad = query->sa_query.mad_buf->mad;
815 init_mad(mad, agent);
816
817 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
818 query->sa_query.release = ib_sa_service_rec_release;
819 mad->mad_hdr.method = method;
820 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
821 mad->sa_hdr.comp_mask = comp_mask;
822
823 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table),
824 rec, mad->data);
825
826 *sa_query = &query->sa_query;
827
828 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
829 if (ret < 0)
830 goto err2;
831
832 return ret;
833
834 err2:
835 *sa_query = NULL;
836 ib_sa_client_put(query->sa_query.client);
837 free_mad(&query->sa_query);
838
839 err1:
840 kfree(query);
841 return ret;
842 }
843 EXPORT_SYMBOL(ib_sa_service_rec_query);
844
845 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
846 int status,
847 struct ib_sa_mad *mad)
848 {
849 struct ib_sa_mcmember_query *query =
850 container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
851
852 if (mad) {
853 struct ib_sa_mcmember_rec rec;
854
855 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
856 mad->data, &rec);
857 query->callback(status, &rec, query->context);
858 } else
859 query->callback(status, NULL, query->context);
860 }
861
862 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
863 {
864 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
865 }
866
867 int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
868 struct ib_device *device, u8 port_num,
869 u8 method,
870 struct ib_sa_mcmember_rec *rec,
871 ib_sa_comp_mask comp_mask,
872 int timeout_ms, gfp_t gfp_mask,
873 void (*callback)(int status,
874 struct ib_sa_mcmember_rec *resp,
875 void *context),
876 void *context,
877 struct ib_sa_query **sa_query)
878 {
879 struct ib_sa_mcmember_query *query;
880 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
881 struct ib_sa_port *port;
882 struct ib_mad_agent *agent;
883 struct ib_sa_mad *mad;
884 int ret;
885
886 if (!sa_dev)
887 return -ENODEV;
888
889 port = &sa_dev->port[port_num - sa_dev->start_port];
890 agent = port->agent;
891
892 query = kmalloc(sizeof *query, gfp_mask);
893 if (!query)
894 return -ENOMEM;
895
896 query->sa_query.port = port;
897 ret = alloc_mad(&query->sa_query, gfp_mask);
898 if (ret)
899 goto err1;
900
901 ib_sa_client_get(client);
902 query->sa_query.client = client;
903 query->callback = callback;
904 query->context = context;
905
906 mad = query->sa_query.mad_buf->mad;
907 init_mad(mad, agent);
908
909 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
910 query->sa_query.release = ib_sa_mcmember_rec_release;
911 mad->mad_hdr.method = method;
912 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
913 mad->sa_hdr.comp_mask = comp_mask;
914
915 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
916 rec, mad->data);
917
918 *sa_query = &query->sa_query;
919
920 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
921 if (ret < 0)
922 goto err2;
923
924 return ret;
925
926 err2:
927 *sa_query = NULL;
928 ib_sa_client_put(query->sa_query.client);
929 free_mad(&query->sa_query);
930
931 err1:
932 kfree(query);
933 return ret;
934 }
935
936 static void send_handler(struct ib_mad_agent *agent,
937 struct ib_mad_send_wc *mad_send_wc)
938 {
939 struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
940 unsigned long flags;
941
942 if (query->callback)
943 switch (mad_send_wc->status) {
944 case IB_WC_SUCCESS:
945 /* No callback -- already got recv */
946 break;
947 case IB_WC_RESP_TIMEOUT_ERR:
948 query->callback(query, -ETIMEDOUT, NULL);
949 break;
950 case IB_WC_WR_FLUSH_ERR:
951 query->callback(query, -EINTR, NULL);
952 break;
953 default:
954 query->callback(query, -EIO, NULL);
955 break;
956 }
957
958 spin_lock_irqsave(&idr_lock, flags);
959 idr_remove(&query_idr, query->id);
960 spin_unlock_irqrestore(&idr_lock, flags);
961
962 free_mad(query);
963 ib_sa_client_put(query->client);
964 query->release(query);
965 }
966
967 static void recv_handler(struct ib_mad_agent *mad_agent,
968 struct ib_mad_recv_wc *mad_recv_wc)
969 {
970 struct ib_sa_query *query;
971 struct ib_mad_send_buf *mad_buf;
972
973 mad_buf = (void *) (unsigned long) mad_recv_wc->wc->wr_id;
974 query = mad_buf->context[0];
975
976 if (query->callback) {
977 if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
978 query->callback(query,
979 mad_recv_wc->recv_buf.mad->mad_hdr.status ?
980 -EINVAL : 0,
981 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
982 else
983 query->callback(query, -EIO, NULL);
984 }
985
986 ib_free_recv_mad(mad_recv_wc);
987 }
988
989 static void ib_sa_add_one(struct ib_device *device)
990 {
991 struct ib_sa_device *sa_dev;
992 int s, e, i;
993
994 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
995 return;
996
997 if (device->node_type == RDMA_NODE_IB_SWITCH)
998 s = e = 0;
999 else {
1000 s = 1;
1001 e = device->phys_port_cnt;
1002 }
1003
1004 sa_dev = kmalloc(sizeof *sa_dev +
1005 (e - s + 1) * sizeof (struct ib_sa_port),
1006 GFP_KERNEL);
1007 if (!sa_dev)
1008 return;
1009
1010 sa_dev->start_port = s;
1011 sa_dev->end_port = e;
1012
1013 for (i = 0; i <= e - s; ++i) {
1014 sa_dev->port[i].sm_ah = NULL;
1015 sa_dev->port[i].port_num = i + s;
1016 spin_lock_init(&sa_dev->port[i].ah_lock);
1017
1018 sa_dev->port[i].agent =
1019 ib_register_mad_agent(device, i + s, IB_QPT_GSI,
1020 NULL, 0, send_handler,
1021 recv_handler, sa_dev);
1022 if (IS_ERR(sa_dev->port[i].agent))
1023 goto err;
1024
1025 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah);
1026 }
1027
1028 ib_set_client_data(device, &sa_client, sa_dev);
1029
1030 /*
1031 * We register our event handler after everything is set up,
1032 * and then update our cached info after the event handler is
1033 * registered to avoid any problems if a port changes state
1034 * during our initialization.
1035 */
1036
1037 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
1038 if (ib_register_event_handler(&sa_dev->event_handler))
1039 goto err;
1040
1041 for (i = 0; i <= e - s; ++i)
1042 update_sm_ah(&sa_dev->port[i].update_task);
1043
1044 return;
1045
1046 err:
1047 while (--i >= 0)
1048 ib_unregister_mad_agent(sa_dev->port[i].agent);
1049
1050 kfree(sa_dev);
1051
1052 return;
1053 }
1054
1055 static void ib_sa_remove_one(struct ib_device *device)
1056 {
1057 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1058 int i;
1059
1060 if (!sa_dev)
1061 return;
1062
1063 ib_unregister_event_handler(&sa_dev->event_handler);
1064
1065 flush_scheduled_work();
1066
1067 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
1068 ib_unregister_mad_agent(sa_dev->port[i].agent);
1069 if (sa_dev->port[i].sm_ah)
1070 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
1071 }
1072
1073 kfree(sa_dev);
1074 }
1075
1076 static int __init ib_sa_init(void)
1077 {
1078 int ret;
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);
Linux with added FPC-III support