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This client driver allows you to use a GPIO pin as a source for PPS
[linux-2.6/next.git] / drivers / infiniband / core / sa_query.c
blobfbbfa24cf57247b1c3d28861a04f08c70067e6e5
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 if (rdma_port_get_link_layer(handler->device, port->port_num) != IB_LINK_LAYER_INFINIBAND)
420 return;
421
422 spin_lock_irqsave(&port->ah_lock, flags);
423 if (port->sm_ah)
424 kref_put(&port->sm_ah->ref, free_sm_ah);
425 port->sm_ah = NULL;
426 spin_unlock_irqrestore(&port->ah_lock, flags);
427
428 queue_work(ib_wq, &sa_dev->port[event->element.port_num -
429 sa_dev->start_port].update_task);
430 }
431 }
432
433 void ib_sa_register_client(struct ib_sa_client *client)
434 {
435 atomic_set(&client->users, 1);
436 init_completion(&client->comp);
437 }
438 EXPORT_SYMBOL(ib_sa_register_client);
439
440 void ib_sa_unregister_client(struct ib_sa_client *client)
441 {
442 ib_sa_client_put(client);
443 wait_for_completion(&client->comp);
444 }
445 EXPORT_SYMBOL(ib_sa_unregister_client);
446
447 /**
448 * ib_sa_cancel_query - try to cancel an SA query
449 * @id:ID of query to cancel
450 * @query:query pointer to cancel
451 *
452 * Try to cancel an SA query. If the id and query don't match up or
453 * the query has already completed, nothing is done. Otherwise the
454 * query is canceled and will complete with a status of -EINTR.
455 */
456 void ib_sa_cancel_query(int id, struct ib_sa_query *query)
457 {
458 unsigned long flags;
459 struct ib_mad_agent *agent;
460 struct ib_mad_send_buf *mad_buf;
461
462 spin_lock_irqsave(&idr_lock, flags);
463 if (idr_find(&query_idr, id) != query) {
464 spin_unlock_irqrestore(&idr_lock, flags);
465 return;
466 }
467 agent = query->port->agent;
468 mad_buf = query->mad_buf;
469 spin_unlock_irqrestore(&idr_lock, flags);
470
471 ib_cancel_mad(agent, mad_buf);
472 }
473 EXPORT_SYMBOL(ib_sa_cancel_query);
474
475 static u8 get_src_path_mask(struct ib_device *device, u8 port_num)
476 {
477 struct ib_sa_device *sa_dev;
478 struct ib_sa_port *port;
479 unsigned long flags;
480 u8 src_path_mask;
481
482 sa_dev = ib_get_client_data(device, &sa_client);
483 if (!sa_dev)
484 return 0x7f;
485
486 port = &sa_dev->port[port_num - sa_dev->start_port];
487 spin_lock_irqsave(&port->ah_lock, flags);
488 src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f;
489 spin_unlock_irqrestore(&port->ah_lock, flags);
490
491 return src_path_mask;
492 }
493
494 int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
495 struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr)
496 {
497 int ret;
498 u16 gid_index;
499 int force_grh;
500
501 memset(ah_attr, 0, sizeof *ah_attr);
502 ah_attr->dlid = be16_to_cpu(rec->dlid);
503 ah_attr->sl = rec->sl;
504 ah_attr->src_path_bits = be16_to_cpu(rec->slid) &
505 get_src_path_mask(device, port_num);
506 ah_attr->port_num = port_num;
507 ah_attr->static_rate = rec->rate;
508
509 force_grh = rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_ETHERNET;
510
511 if (rec->hop_limit > 1 || force_grh) {
512 ah_attr->ah_flags = IB_AH_GRH;
513 ah_attr->grh.dgid = rec->dgid;
514
515 ret = ib_find_cached_gid(device, &rec->sgid, &port_num,
516 &gid_index);
517 if (ret)
518 return ret;
519
520 ah_attr->grh.sgid_index = gid_index;
521 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
522 ah_attr->grh.hop_limit = rec->hop_limit;
523 ah_attr->grh.traffic_class = rec->traffic_class;
524 }
525 return 0;
526 }
527 EXPORT_SYMBOL(ib_init_ah_from_path);
528
529 static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask)
530 {
531 unsigned long flags;
532
533 spin_lock_irqsave(&query->port->ah_lock, flags);
534 if (!query->port->sm_ah) {
535 spin_unlock_irqrestore(&query->port->ah_lock, flags);
536 return -EAGAIN;
537 }
538 kref_get(&query->port->sm_ah->ref);
539 query->sm_ah = query->port->sm_ah;
540 spin_unlock_irqrestore(&query->port->ah_lock, flags);
541
542 query->mad_buf = ib_create_send_mad(query->port->agent, 1,
543 query->sm_ah->pkey_index,
544 0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA,
545 gfp_mask);
546 if (IS_ERR(query->mad_buf)) {
547 kref_put(&query->sm_ah->ref, free_sm_ah);
548 return -ENOMEM;
549 }
550
551 query->mad_buf->ah = query->sm_ah->ah;
552
553 return 0;
554 }
555
556 static void free_mad(struct ib_sa_query *query)
557 {
558 ib_free_send_mad(query->mad_buf);
559 kref_put(&query->sm_ah->ref, free_sm_ah);
560 }
561
562 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
563 {
564 unsigned long flags;
565
566 memset(mad, 0, sizeof *mad);
567
568 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION;
569 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
570 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
571
572 spin_lock_irqsave(&tid_lock, flags);
573 mad->mad_hdr.tid =
574 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
575 spin_unlock_irqrestore(&tid_lock, flags);
576 }
577
578 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask)
579 {
580 unsigned long flags;
581 int ret, id;
582
583 retry:
584 if (!idr_pre_get(&query_idr, gfp_mask))
585 return -ENOMEM;
586 spin_lock_irqsave(&idr_lock, flags);
587 ret = idr_get_new(&query_idr, query, &id);
588 spin_unlock_irqrestore(&idr_lock, flags);
589 if (ret == -EAGAIN)
590 goto retry;
591 if (ret)
592 return ret;
593
594 query->mad_buf->timeout_ms = timeout_ms;
595 query->mad_buf->context[0] = query;
596 query->id = id;
597
598 ret = ib_post_send_mad(query->mad_buf, NULL);
599 if (ret) {
600 spin_lock_irqsave(&idr_lock, flags);
601 idr_remove(&query_idr, id);
602 spin_unlock_irqrestore(&idr_lock, flags);
603 }
604
605 /*
606 * It's not safe to dereference query any more, because the
607 * send may already have completed and freed the query in
608 * another context.
609 */
610 return ret ? ret : id;
611 }
612
613 void ib_sa_unpack_path(void *attribute, struct ib_sa_path_rec *rec)
614 {
615 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), attribute, rec);
616 }
617 EXPORT_SYMBOL(ib_sa_unpack_path);
618
619 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
620 int status,
621 struct ib_sa_mad *mad)
622 {
623 struct ib_sa_path_query *query =
624 container_of(sa_query, struct ib_sa_path_query, sa_query);
625
626 if (mad) {
627 struct ib_sa_path_rec rec;
628
629 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
630 mad->data, &rec);
631 query->callback(status, &rec, query->context);
632 } else
633 query->callback(status, NULL, query->context);
634 }
635
636 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
637 {
638 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query));
639 }
640
641 /**
642 * ib_sa_path_rec_get - Start a Path get query
643 * @client:SA client
644 * @device:device to send query on
645 * @port_num: port number to send query on
646 * @rec:Path Record to send in query
647 * @comp_mask:component mask to send in query
648 * @timeout_ms:time to wait for response
649 * @gfp_mask:GFP mask to use for internal allocations
650 * @callback:function called when query completes, times out or is
651 * canceled
652 * @context:opaque user context passed to callback
653 * @sa_query:query context, used to cancel query
654 *
655 * Send a Path Record Get query to the SA to look up a path. The
656 * callback function will be called when the query completes (or
657 * fails); status is 0 for a successful response, -EINTR if the query
658 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
659 * occurred sending the query. The resp parameter of the callback is
660 * only valid if status is 0.
661 *
662 * If the return value of ib_sa_path_rec_get() is negative, it is an
663 * error code. Otherwise it is a query ID that can be used to cancel
664 * the query.
665 */
666 int ib_sa_path_rec_get(struct ib_sa_client *client,
667 struct ib_device *device, u8 port_num,
668 struct ib_sa_path_rec *rec,
669 ib_sa_comp_mask comp_mask,
670 int timeout_ms, gfp_t gfp_mask,
671 void (*callback)(int status,
672 struct ib_sa_path_rec *resp,
673 void *context),
674 void *context,
675 struct ib_sa_query **sa_query)
676 {
677 struct ib_sa_path_query *query;
678 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
679 struct ib_sa_port *port;
680 struct ib_mad_agent *agent;
681 struct ib_sa_mad *mad;
682 int ret;
683
684 if (!sa_dev)
685 return -ENODEV;
686
687 port = &sa_dev->port[port_num - sa_dev->start_port];
688 agent = port->agent;
689
690 query = kmalloc(sizeof *query, gfp_mask);
691 if (!query)
692 return -ENOMEM;
693
694 query->sa_query.port = port;
695 ret = alloc_mad(&query->sa_query, gfp_mask);
696 if (ret)
697 goto err1;
698
699 ib_sa_client_get(client);
700 query->sa_query.client = client;
701 query->callback = callback;
702 query->context = context;
703
704 mad = query->sa_query.mad_buf->mad;
705 init_mad(mad, agent);
706
707 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
708 query->sa_query.release = ib_sa_path_rec_release;
709 mad->mad_hdr.method = IB_MGMT_METHOD_GET;
710 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC);
711 mad->sa_hdr.comp_mask = comp_mask;
712
713 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data);
714
715 *sa_query = &query->sa_query;
716
717 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
718 if (ret < 0)
719 goto err2;
720
721 return ret;
722
723 err2:
724 *sa_query = NULL;
725 ib_sa_client_put(query->sa_query.client);
726 free_mad(&query->sa_query);
727
728 err1:
729 kfree(query);
730 return ret;
731 }
732 EXPORT_SYMBOL(ib_sa_path_rec_get);
733
734 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query,
735 int status,
736 struct ib_sa_mad *mad)
737 {
738 struct ib_sa_service_query *query =
739 container_of(sa_query, struct ib_sa_service_query, sa_query);
740
741 if (mad) {
742 struct ib_sa_service_rec rec;
743
744 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table),
745 mad->data, &rec);
746 query->callback(status, &rec, query->context);
747 } else
748 query->callback(status, NULL, query->context);
749 }
750
751 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query)
752 {
753 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query));
754 }
755
756 /**
757 * ib_sa_service_rec_query - Start Service Record operation
758 * @client:SA client
759 * @device:device to send request on
760 * @port_num: port number to send request on
761 * @method:SA method - should be get, set, or delete
762 * @rec:Service Record to send in request
763 * @comp_mask:component mask to send in request
764 * @timeout_ms:time to wait for response
765 * @gfp_mask:GFP mask to use for internal allocations
766 * @callback:function called when request completes, times out or is
767 * canceled
768 * @context:opaque user context passed to callback
769 * @sa_query:request context, used to cancel request
770 *
771 * Send a Service Record set/get/delete to the SA to register,
772 * unregister or query a service record.
773 * The callback function will be called when the request completes (or
774 * fails); status is 0 for a successful response, -EINTR if the query
775 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
776 * occurred sending the query. The resp parameter of the callback is
777 * only valid if status is 0.
778 *
779 * If the return value of ib_sa_service_rec_query() is negative, it is an
780 * error code. Otherwise it is a request ID that can be used to cancel
781 * the query.
782 */
783 int ib_sa_service_rec_query(struct ib_sa_client *client,
784 struct ib_device *device, u8 port_num, u8 method,
785 struct ib_sa_service_rec *rec,
786 ib_sa_comp_mask comp_mask,
787 int timeout_ms, gfp_t gfp_mask,
788 void (*callback)(int status,
789 struct ib_sa_service_rec *resp,
790 void *context),
791 void *context,
792 struct ib_sa_query **sa_query)
793 {
794 struct ib_sa_service_query *query;
795 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
796 struct ib_sa_port *port;
797 struct ib_mad_agent *agent;
798 struct ib_sa_mad *mad;
799 int ret;
800
801 if (!sa_dev)
802 return -ENODEV;
803
804 port = &sa_dev->port[port_num - sa_dev->start_port];
805 agent = port->agent;
806
807 if (method != IB_MGMT_METHOD_GET &&
808 method != IB_MGMT_METHOD_SET &&
809 method != IB_SA_METHOD_DELETE)
810 return -EINVAL;
811
812 query = kmalloc(sizeof *query, gfp_mask);
813 if (!query)
814 return -ENOMEM;
815
816 query->sa_query.port = port;
817 ret = alloc_mad(&query->sa_query, gfp_mask);
818 if (ret)
819 goto err1;
820
821 ib_sa_client_get(client);
822 query->sa_query.client = client;
823 query->callback = callback;
824 query->context = context;
825
826 mad = query->sa_query.mad_buf->mad;
827 init_mad(mad, agent);
828
829 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
830 query->sa_query.release = ib_sa_service_rec_release;
831 mad->mad_hdr.method = method;
832 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
833 mad->sa_hdr.comp_mask = comp_mask;
834
835 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table),
836 rec, mad->data);
837
838 *sa_query = &query->sa_query;
839
840 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
841 if (ret < 0)
842 goto err2;
843
844 return ret;
845
846 err2:
847 *sa_query = NULL;
848 ib_sa_client_put(query->sa_query.client);
849 free_mad(&query->sa_query);
850
851 err1:
852 kfree(query);
853 return ret;
854 }
855 EXPORT_SYMBOL(ib_sa_service_rec_query);
856
857 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
858 int status,
859 struct ib_sa_mad *mad)
860 {
861 struct ib_sa_mcmember_query *query =
862 container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
863
864 if (mad) {
865 struct ib_sa_mcmember_rec rec;
866
867 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
868 mad->data, &rec);
869 query->callback(status, &rec, query->context);
870 } else
871 query->callback(status, NULL, query->context);
872 }
873
874 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
875 {
876 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
877 }
878
879 int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
880 struct ib_device *device, u8 port_num,
881 u8 method,
882 struct ib_sa_mcmember_rec *rec,
883 ib_sa_comp_mask comp_mask,
884 int timeout_ms, gfp_t gfp_mask,
885 void (*callback)(int status,
886 struct ib_sa_mcmember_rec *resp,
887 void *context),
888 void *context,
889 struct ib_sa_query **sa_query)
890 {
891 struct ib_sa_mcmember_query *query;
892 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
893 struct ib_sa_port *port;
894 struct ib_mad_agent *agent;
895 struct ib_sa_mad *mad;
896 int ret;
897
898 if (!sa_dev)
899 return -ENODEV;
900
901 port = &sa_dev->port[port_num - sa_dev->start_port];
902 agent = port->agent;
903
904 query = kmalloc(sizeof *query, gfp_mask);
905 if (!query)
906 return -ENOMEM;
907
908 query->sa_query.port = port;
909 ret = alloc_mad(&query->sa_query, gfp_mask);
910 if (ret)
911 goto err1;
912
913 ib_sa_client_get(client);
914 query->sa_query.client = client;
915 query->callback = callback;
916 query->context = context;
917
918 mad = query->sa_query.mad_buf->mad;
919 init_mad(mad, agent);
920
921 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
922 query->sa_query.release = ib_sa_mcmember_rec_release;
923 mad->mad_hdr.method = method;
924 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
925 mad->sa_hdr.comp_mask = comp_mask;
926
927 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
928 rec, mad->data);
929
930 *sa_query = &query->sa_query;
931
932 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
933 if (ret < 0)
934 goto err2;
935
936 return ret;
937
938 err2:
939 *sa_query = NULL;
940 ib_sa_client_put(query->sa_query.client);
941 free_mad(&query->sa_query);
942
943 err1:
944 kfree(query);
945 return ret;
946 }
947
948 static void send_handler(struct ib_mad_agent *agent,
949 struct ib_mad_send_wc *mad_send_wc)
950 {
951 struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
952 unsigned long flags;
953
954 if (query->callback)
955 switch (mad_send_wc->status) {
956 case IB_WC_SUCCESS:
957 /* No callback -- already got recv */
958 break;
959 case IB_WC_RESP_TIMEOUT_ERR:
960 query->callback(query, -ETIMEDOUT, NULL);
961 break;
962 case IB_WC_WR_FLUSH_ERR:
963 query->callback(query, -EINTR, NULL);
964 break;
965 default:
966 query->callback(query, -EIO, NULL);
967 break;
968 }
969
970 spin_lock_irqsave(&idr_lock, flags);
971 idr_remove(&query_idr, query->id);
972 spin_unlock_irqrestore(&idr_lock, flags);
973
974 free_mad(query);
975 ib_sa_client_put(query->client);
976 query->release(query);
977 }
978
979 static void recv_handler(struct ib_mad_agent *mad_agent,
980 struct ib_mad_recv_wc *mad_recv_wc)
981 {
982 struct ib_sa_query *query;
983 struct ib_mad_send_buf *mad_buf;
984
985 mad_buf = (void *) (unsigned long) mad_recv_wc->wc->wr_id;
986 query = mad_buf->context[0];
987
988 if (query->callback) {
989 if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
990 query->callback(query,
991 mad_recv_wc->recv_buf.mad->mad_hdr.status ?
992 -EINVAL : 0,
993 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
994 else
995 query->callback(query, -EIO, NULL);
996 }
997
998 ib_free_recv_mad(mad_recv_wc);
999 }
1000
1001 static void ib_sa_add_one(struct ib_device *device)
1002 {
1003 struct ib_sa_device *sa_dev;
1004 int s, e, i;
1005
1006 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1007 return;
1008
1009 if (device->node_type == RDMA_NODE_IB_SWITCH)
1010 s = e = 0;
1011 else {
1012 s = 1;
1013 e = device->phys_port_cnt;
1014 }
1015
1016 sa_dev = kzalloc(sizeof *sa_dev +
1017 (e - s + 1) * sizeof (struct ib_sa_port),
1018 GFP_KERNEL);
1019 if (!sa_dev)
1020 return;
1021
1022 sa_dev->start_port = s;
1023 sa_dev->end_port = e;
1024
1025 for (i = 0; i <= e - s; ++i) {
1026 spin_lock_init(&sa_dev->port[i].ah_lock);
1027 if (rdma_port_get_link_layer(device, i + 1) != IB_LINK_LAYER_INFINIBAND)
1028 continue;
1029
1030 sa_dev->port[i].sm_ah = NULL;
1031 sa_dev->port[i].port_num = i + s;
1032
1033 sa_dev->port[i].agent =
1034 ib_register_mad_agent(device, i + s, IB_QPT_GSI,
1035 NULL, 0, send_handler,
1036 recv_handler, sa_dev);
1037 if (IS_ERR(sa_dev->port[i].agent))
1038 goto err;
1039
1040 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah);
1041 }
1042
1043 ib_set_client_data(device, &sa_client, sa_dev);
1044
1045 /*
1046 * We register our event handler after everything is set up,
1047 * and then update our cached info after the event handler is
1048 * registered to avoid any problems if a port changes state
1049 * during our initialization.
1050 */
1051
1052 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
1053 if (ib_register_event_handler(&sa_dev->event_handler))
1054 goto err;
1055
1056 for (i = 0; i <= e - s; ++i)
1057 if (rdma_port_get_link_layer(device, i + 1) == IB_LINK_LAYER_INFINIBAND)
1058 update_sm_ah(&sa_dev->port[i].update_task);
1059
1060 return;
1061
1062 err:
1063 while (--i >= 0)
1064 if (rdma_port_get_link_layer(device, i + 1) == IB_LINK_LAYER_INFINIBAND)
1065 ib_unregister_mad_agent(sa_dev->port[i].agent);
1066
1067 kfree(sa_dev);
1068
1069 return;
1070 }
1071
1072 static void ib_sa_remove_one(struct ib_device *device)
1073 {
1074 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1075 int i;
1076
1077 if (!sa_dev)
1078 return;
1079
1080 ib_unregister_event_handler(&sa_dev->event_handler);
1081
1082 flush_workqueue(ib_wq);
1083
1084 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
1085 if (rdma_port_get_link_layer(device, i + 1) == IB_LINK_LAYER_INFINIBAND) {
1086 ib_unregister_mad_agent(sa_dev->port[i].agent);
1087 if (sa_dev->port[i].sm_ah)
1088 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
1089 }
1090
1091 }
1092
1093 kfree(sa_dev);
1094 }
1095
1096 static int __init ib_sa_init(void)
1097 {
1098 int ret;
1099
1100 get_random_bytes(&tid, sizeof tid);
1101
1102 ret = ib_register_client(&sa_client);
1103 if (ret) {
1104 printk(KERN_ERR "Couldn't register ib_sa client\n");
1105 goto err1;
1106 }
1107
1108 ret = mcast_init();
1109 if (ret) {
1110 printk(KERN_ERR "Couldn't initialize multicast handling\n");
1111 goto err2;
1112 }
1113
1114 return 0;
1115 err2:
1116 ib_unregister_client(&sa_client);
1117 err1:
1118 return ret;
1119 }
1120
1121 static void __exit ib_sa_cleanup(void)
1122 {
1123 mcast_cleanup();
1124 ib_unregister_client(&sa_client);
1125 idr_destroy(&query_idr);
1126 }
1127
1128 module_init(ib_sa_init);
1129 module_exit(ib_sa_cleanup);
linux-next