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Merge branch 'fix/rt5645' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...
[deliverable/linux.git] / drivers / infiniband / core / sa_query.c
1 /*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
4 * 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 #include <uapi/linux/if_ether.h>
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_guidinfo_query {
98 void (*callback)(int, struct ib_sa_guidinfo_rec *, void *);
99 void *context;
100 struct ib_sa_query sa_query;
101 };
102
103 struct ib_sa_mcmember_query {
104 void (*callback)(int, struct ib_sa_mcmember_rec *, void *);
105 void *context;
106 struct ib_sa_query sa_query;
107 };
108
109 static void ib_sa_add_one(struct ib_device *device);
110 static void ib_sa_remove_one(struct ib_device *device);
111
112 static struct ib_client sa_client = {
113 .name = "sa",
114 .add = ib_sa_add_one,
115 .remove = ib_sa_remove_one
116 };
117
118 static DEFINE_SPINLOCK(idr_lock);
119 static DEFINE_IDR(query_idr);
120
121 static DEFINE_SPINLOCK(tid_lock);
122 static u32 tid;
123
124 #define PATH_REC_FIELD(field) \
125 .struct_offset_bytes = offsetof(struct ib_sa_path_rec, field), \
126 .struct_size_bytes = sizeof ((struct ib_sa_path_rec *) 0)->field, \
127 .field_name = "sa_path_rec:" #field
128
129 static const struct ib_field path_rec_table[] = {
130 { PATH_REC_FIELD(service_id),
131 .offset_words = 0,
132 .offset_bits = 0,
133 .size_bits = 64 },
134 { PATH_REC_FIELD(dgid),
135 .offset_words = 2,
136 .offset_bits = 0,
137 .size_bits = 128 },
138 { PATH_REC_FIELD(sgid),
139 .offset_words = 6,
140 .offset_bits = 0,
141 .size_bits = 128 },
142 { PATH_REC_FIELD(dlid),
143 .offset_words = 10,
144 .offset_bits = 0,
145 .size_bits = 16 },
146 { PATH_REC_FIELD(slid),
147 .offset_words = 10,
148 .offset_bits = 16,
149 .size_bits = 16 },
150 { PATH_REC_FIELD(raw_traffic),
151 .offset_words = 11,
152 .offset_bits = 0,
153 .size_bits = 1 },
154 { RESERVED,
155 .offset_words = 11,
156 .offset_bits = 1,
157 .size_bits = 3 },
158 { PATH_REC_FIELD(flow_label),
159 .offset_words = 11,
160 .offset_bits = 4,
161 .size_bits = 20 },
162 { PATH_REC_FIELD(hop_limit),
163 .offset_words = 11,
164 .offset_bits = 24,
165 .size_bits = 8 },
166 { PATH_REC_FIELD(traffic_class),
167 .offset_words = 12,
168 .offset_bits = 0,
169 .size_bits = 8 },
170 { PATH_REC_FIELD(reversible),
171 .offset_words = 12,
172 .offset_bits = 8,
173 .size_bits = 1 },
174 { PATH_REC_FIELD(numb_path),
175 .offset_words = 12,
176 .offset_bits = 9,
177 .size_bits = 7 },
178 { PATH_REC_FIELD(pkey),
179 .offset_words = 12,
180 .offset_bits = 16,
181 .size_bits = 16 },
182 { PATH_REC_FIELD(qos_class),
183 .offset_words = 13,
184 .offset_bits = 0,
185 .size_bits = 12 },
186 { PATH_REC_FIELD(sl),
187 .offset_words = 13,
188 .offset_bits = 12,
189 .size_bits = 4 },
190 { PATH_REC_FIELD(mtu_selector),
191 .offset_words = 13,
192 .offset_bits = 16,
193 .size_bits = 2 },
194 { PATH_REC_FIELD(mtu),
195 .offset_words = 13,
196 .offset_bits = 18,
197 .size_bits = 6 },
198 { PATH_REC_FIELD(rate_selector),
199 .offset_words = 13,
200 .offset_bits = 24,
201 .size_bits = 2 },
202 { PATH_REC_FIELD(rate),
203 .offset_words = 13,
204 .offset_bits = 26,
205 .size_bits = 6 },
206 { PATH_REC_FIELD(packet_life_time_selector),
207 .offset_words = 14,
208 .offset_bits = 0,
209 .size_bits = 2 },
210 { PATH_REC_FIELD(packet_life_time),
211 .offset_words = 14,
212 .offset_bits = 2,
213 .size_bits = 6 },
214 { PATH_REC_FIELD(preference),
215 .offset_words = 14,
216 .offset_bits = 8,
217 .size_bits = 8 },
218 { RESERVED,
219 .offset_words = 14,
220 .offset_bits = 16,
221 .size_bits = 48 },
222 };
223
224 #define MCMEMBER_REC_FIELD(field) \
225 .struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field), \
226 .struct_size_bytes = sizeof ((struct ib_sa_mcmember_rec *) 0)->field, \
227 .field_name = "sa_mcmember_rec:" #field
228
229 static const struct ib_field mcmember_rec_table[] = {
230 { MCMEMBER_REC_FIELD(mgid),
231 .offset_words = 0,
232 .offset_bits = 0,
233 .size_bits = 128 },
234 { MCMEMBER_REC_FIELD(port_gid),
235 .offset_words = 4,
236 .offset_bits = 0,
237 .size_bits = 128 },
238 { MCMEMBER_REC_FIELD(qkey),
239 .offset_words = 8,
240 .offset_bits = 0,
241 .size_bits = 32 },
242 { MCMEMBER_REC_FIELD(mlid),
243 .offset_words = 9,
244 .offset_bits = 0,
245 .size_bits = 16 },
246 { MCMEMBER_REC_FIELD(mtu_selector),
247 .offset_words = 9,
248 .offset_bits = 16,
249 .size_bits = 2 },
250 { MCMEMBER_REC_FIELD(mtu),
251 .offset_words = 9,
252 .offset_bits = 18,
253 .size_bits = 6 },
254 { MCMEMBER_REC_FIELD(traffic_class),
255 .offset_words = 9,
256 .offset_bits = 24,
257 .size_bits = 8 },
258 { MCMEMBER_REC_FIELD(pkey),
259 .offset_words = 10,
260 .offset_bits = 0,
261 .size_bits = 16 },
262 { MCMEMBER_REC_FIELD(rate_selector),
263 .offset_words = 10,
264 .offset_bits = 16,
265 .size_bits = 2 },
266 { MCMEMBER_REC_FIELD(rate),
267 .offset_words = 10,
268 .offset_bits = 18,
269 .size_bits = 6 },
270 { MCMEMBER_REC_FIELD(packet_life_time_selector),
271 .offset_words = 10,
272 .offset_bits = 24,
273 .size_bits = 2 },
274 { MCMEMBER_REC_FIELD(packet_life_time),
275 .offset_words = 10,
276 .offset_bits = 26,
277 .size_bits = 6 },
278 { MCMEMBER_REC_FIELD(sl),
279 .offset_words = 11,
280 .offset_bits = 0,
281 .size_bits = 4 },
282 { MCMEMBER_REC_FIELD(flow_label),
283 .offset_words = 11,
284 .offset_bits = 4,
285 .size_bits = 20 },
286 { MCMEMBER_REC_FIELD(hop_limit),
287 .offset_words = 11,
288 .offset_bits = 24,
289 .size_bits = 8 },
290 { MCMEMBER_REC_FIELD(scope),
291 .offset_words = 12,
292 .offset_bits = 0,
293 .size_bits = 4 },
294 { MCMEMBER_REC_FIELD(join_state),
295 .offset_words = 12,
296 .offset_bits = 4,
297 .size_bits = 4 },
298 { MCMEMBER_REC_FIELD(proxy_join),
299 .offset_words = 12,
300 .offset_bits = 8,
301 .size_bits = 1 },
302 { RESERVED,
303 .offset_words = 12,
304 .offset_bits = 9,
305 .size_bits = 23 },
306 };
307
308 #define SERVICE_REC_FIELD(field) \
309 .struct_offset_bytes = offsetof(struct ib_sa_service_rec, field), \
310 .struct_size_bytes = sizeof ((struct ib_sa_service_rec *) 0)->field, \
311 .field_name = "sa_service_rec:" #field
312
313 static const struct ib_field service_rec_table[] = {
314 { SERVICE_REC_FIELD(id),
315 .offset_words = 0,
316 .offset_bits = 0,
317 .size_bits = 64 },
318 { SERVICE_REC_FIELD(gid),
319 .offset_words = 2,
320 .offset_bits = 0,
321 .size_bits = 128 },
322 { SERVICE_REC_FIELD(pkey),
323 .offset_words = 6,
324 .offset_bits = 0,
325 .size_bits = 16 },
326 { SERVICE_REC_FIELD(lease),
327 .offset_words = 7,
328 .offset_bits = 0,
329 .size_bits = 32 },
330 { SERVICE_REC_FIELD(key),
331 .offset_words = 8,
332 .offset_bits = 0,
333 .size_bits = 128 },
334 { SERVICE_REC_FIELD(name),
335 .offset_words = 12,
336 .offset_bits = 0,
337 .size_bits = 64*8 },
338 { SERVICE_REC_FIELD(data8),
339 .offset_words = 28,
340 .offset_bits = 0,
341 .size_bits = 16*8 },
342 { SERVICE_REC_FIELD(data16),
343 .offset_words = 32,
344 .offset_bits = 0,
345 .size_bits = 8*16 },
346 { SERVICE_REC_FIELD(data32),
347 .offset_words = 36,
348 .offset_bits = 0,
349 .size_bits = 4*32 },
350 { SERVICE_REC_FIELD(data64),
351 .offset_words = 40,
352 .offset_bits = 0,
353 .size_bits = 2*64 },
354 };
355
356 #define GUIDINFO_REC_FIELD(field) \
357 .struct_offset_bytes = offsetof(struct ib_sa_guidinfo_rec, field), \
358 .struct_size_bytes = sizeof((struct ib_sa_guidinfo_rec *) 0)->field, \
359 .field_name = "sa_guidinfo_rec:" #field
360
361 static const struct ib_field guidinfo_rec_table[] = {
362 { GUIDINFO_REC_FIELD(lid),
363 .offset_words = 0,
364 .offset_bits = 0,
365 .size_bits = 16 },
366 { GUIDINFO_REC_FIELD(block_num),
367 .offset_words = 0,
368 .offset_bits = 16,
369 .size_bits = 8 },
370 { GUIDINFO_REC_FIELD(res1),
371 .offset_words = 0,
372 .offset_bits = 24,
373 .size_bits = 8 },
374 { GUIDINFO_REC_FIELD(res2),
375 .offset_words = 1,
376 .offset_bits = 0,
377 .size_bits = 32 },
378 { GUIDINFO_REC_FIELD(guid_info_list),
379 .offset_words = 2,
380 .offset_bits = 0,
381 .size_bits = 512 },
382 };
383
384 static void free_sm_ah(struct kref *kref)
385 {
386 struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref);
387
388 ib_destroy_ah(sm_ah->ah);
389 kfree(sm_ah);
390 }
391
392 static void update_sm_ah(struct work_struct *work)
393 {
394 struct ib_sa_port *port =
395 container_of(work, struct ib_sa_port, update_task);
396 struct ib_sa_sm_ah *new_ah;
397 struct ib_port_attr port_attr;
398 struct ib_ah_attr ah_attr;
399
400 if (ib_query_port(port->agent->device, port->port_num, &port_attr)) {
401 printk(KERN_WARNING "Couldn't query port\n");
402 return;
403 }
404
405 new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL);
406 if (!new_ah) {
407 printk(KERN_WARNING "Couldn't allocate new SM AH\n");
408 return;
409 }
410
411 kref_init(&new_ah->ref);
412 new_ah->src_path_mask = (1 << port_attr.lmc) - 1;
413
414 new_ah->pkey_index = 0;
415 if (ib_find_pkey(port->agent->device, port->port_num,
416 IB_DEFAULT_PKEY_FULL, &new_ah->pkey_index))
417 printk(KERN_ERR "Couldn't find index for default PKey\n");
418
419 memset(&ah_attr, 0, sizeof ah_attr);
420 ah_attr.dlid = port_attr.sm_lid;
421 ah_attr.sl = port_attr.sm_sl;
422 ah_attr.port_num = port->port_num;
423
424 new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr);
425 if (IS_ERR(new_ah->ah)) {
426 printk(KERN_WARNING "Couldn't create new SM AH\n");
427 kfree(new_ah);
428 return;
429 }
430
431 spin_lock_irq(&port->ah_lock);
432 if (port->sm_ah)
433 kref_put(&port->sm_ah->ref, free_sm_ah);
434 port->sm_ah = new_ah;
435 spin_unlock_irq(&port->ah_lock);
436
437 }
438
439 static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event)
440 {
441 if (event->event == IB_EVENT_PORT_ERR ||
442 event->event == IB_EVENT_PORT_ACTIVE ||
443 event->event == IB_EVENT_LID_CHANGE ||
444 event->event == IB_EVENT_PKEY_CHANGE ||
445 event->event == IB_EVENT_SM_CHANGE ||
446 event->event == IB_EVENT_CLIENT_REREGISTER) {
447 unsigned long flags;
448 struct ib_sa_device *sa_dev =
449 container_of(handler, typeof(*sa_dev), event_handler);
450 struct ib_sa_port *port =
451 &sa_dev->port[event->element.port_num - sa_dev->start_port];
452
453 if (!rdma_cap_ib_sa(handler->device, port->port_num))
454 return;
455
456 spin_lock_irqsave(&port->ah_lock, flags);
457 if (port->sm_ah)
458 kref_put(&port->sm_ah->ref, free_sm_ah);
459 port->sm_ah = NULL;
460 spin_unlock_irqrestore(&port->ah_lock, flags);
461
462 queue_work(ib_wq, &sa_dev->port[event->element.port_num -
463 sa_dev->start_port].update_task);
464 }
465 }
466
467 void ib_sa_register_client(struct ib_sa_client *client)
468 {
469 atomic_set(&client->users, 1);
470 init_completion(&client->comp);
471 }
472 EXPORT_SYMBOL(ib_sa_register_client);
473
474 void ib_sa_unregister_client(struct ib_sa_client *client)
475 {
476 ib_sa_client_put(client);
477 wait_for_completion(&client->comp);
478 }
479 EXPORT_SYMBOL(ib_sa_unregister_client);
480
481 /**
482 * ib_sa_cancel_query - try to cancel an SA query
483 * @id:ID of query to cancel
484 * @query:query pointer to cancel
485 *
486 * Try to cancel an SA query. If the id and query don't match up or
487 * the query has already completed, nothing is done. Otherwise the
488 * query is canceled and will complete with a status of -EINTR.
489 */
490 void ib_sa_cancel_query(int id, struct ib_sa_query *query)
491 {
492 unsigned long flags;
493 struct ib_mad_agent *agent;
494 struct ib_mad_send_buf *mad_buf;
495
496 spin_lock_irqsave(&idr_lock, flags);
497 if (idr_find(&query_idr, id) != query) {
498 spin_unlock_irqrestore(&idr_lock, flags);
499 return;
500 }
501 agent = query->port->agent;
502 mad_buf = query->mad_buf;
503 spin_unlock_irqrestore(&idr_lock, flags);
504
505 ib_cancel_mad(agent, mad_buf);
506 }
507 EXPORT_SYMBOL(ib_sa_cancel_query);
508
509 static u8 get_src_path_mask(struct ib_device *device, u8 port_num)
510 {
511 struct ib_sa_device *sa_dev;
512 struct ib_sa_port *port;
513 unsigned long flags;
514 u8 src_path_mask;
515
516 sa_dev = ib_get_client_data(device, &sa_client);
517 if (!sa_dev)
518 return 0x7f;
519
520 port = &sa_dev->port[port_num - sa_dev->start_port];
521 spin_lock_irqsave(&port->ah_lock, flags);
522 src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f;
523 spin_unlock_irqrestore(&port->ah_lock, flags);
524
525 return src_path_mask;
526 }
527
528 int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
529 struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr)
530 {
531 int ret;
532 u16 gid_index;
533 int force_grh;
534
535 memset(ah_attr, 0, sizeof *ah_attr);
536 ah_attr->dlid = be16_to_cpu(rec->dlid);
537 ah_attr->sl = rec->sl;
538 ah_attr->src_path_bits = be16_to_cpu(rec->slid) &
539 get_src_path_mask(device, port_num);
540 ah_attr->port_num = port_num;
541 ah_attr->static_rate = rec->rate;
542
543 force_grh = rdma_cap_eth_ah(device, port_num);
544
545 if (rec->hop_limit > 1 || force_grh) {
546 ah_attr->ah_flags = IB_AH_GRH;
547 ah_attr->grh.dgid = rec->dgid;
548
549 ret = ib_find_cached_gid(device, &rec->sgid, &port_num,
550 &gid_index);
551 if (ret)
552 return ret;
553
554 ah_attr->grh.sgid_index = gid_index;
555 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
556 ah_attr->grh.hop_limit = rec->hop_limit;
557 ah_attr->grh.traffic_class = rec->traffic_class;
558 }
559 if (force_grh) {
560 memcpy(ah_attr->dmac, rec->dmac, ETH_ALEN);
561 ah_attr->vlan_id = rec->vlan_id;
562 } else {
563 ah_attr->vlan_id = 0xffff;
564 }
565
566 return 0;
567 }
568 EXPORT_SYMBOL(ib_init_ah_from_path);
569
570 static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask)
571 {
572 unsigned long flags;
573
574 spin_lock_irqsave(&query->port->ah_lock, flags);
575 if (!query->port->sm_ah) {
576 spin_unlock_irqrestore(&query->port->ah_lock, flags);
577 return -EAGAIN;
578 }
579 kref_get(&query->port->sm_ah->ref);
580 query->sm_ah = query->port->sm_ah;
581 spin_unlock_irqrestore(&query->port->ah_lock, flags);
582
583 query->mad_buf = ib_create_send_mad(query->port->agent, 1,
584 query->sm_ah->pkey_index,
585 0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA,
586 gfp_mask,
587 IB_MGMT_BASE_VERSION);
588 if (IS_ERR(query->mad_buf)) {
589 kref_put(&query->sm_ah->ref, free_sm_ah);
590 return -ENOMEM;
591 }
592
593 query->mad_buf->ah = query->sm_ah->ah;
594
595 return 0;
596 }
597
598 static void free_mad(struct ib_sa_query *query)
599 {
600 ib_free_send_mad(query->mad_buf);
601 kref_put(&query->sm_ah->ref, free_sm_ah);
602 }
603
604 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
605 {
606 unsigned long flags;
607
608 memset(mad, 0, sizeof *mad);
609
610 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION;
611 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
612 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
613
614 spin_lock_irqsave(&tid_lock, flags);
615 mad->mad_hdr.tid =
616 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
617 spin_unlock_irqrestore(&tid_lock, flags);
618 }
619
620 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask)
621 {
622 bool preload = !!(gfp_mask & __GFP_WAIT);
623 unsigned long flags;
624 int ret, id;
625
626 if (preload)
627 idr_preload(gfp_mask);
628 spin_lock_irqsave(&idr_lock, flags);
629
630 id = idr_alloc(&query_idr, query, 0, 0, GFP_NOWAIT);
631
632 spin_unlock_irqrestore(&idr_lock, flags);
633 if (preload)
634 idr_preload_end();
635 if (id < 0)
636 return id;
637
638 query->mad_buf->timeout_ms = timeout_ms;
639 query->mad_buf->context[0] = query;
640 query->id = id;
641
642 ret = ib_post_send_mad(query->mad_buf, NULL);
643 if (ret) {
644 spin_lock_irqsave(&idr_lock, flags);
645 idr_remove(&query_idr, id);
646 spin_unlock_irqrestore(&idr_lock, flags);
647 }
648
649 /*
650 * It's not safe to dereference query any more, because the
651 * send may already have completed and freed the query in
652 * another context.
653 */
654 return ret ? ret : id;
655 }
656
657 void ib_sa_unpack_path(void *attribute, struct ib_sa_path_rec *rec)
658 {
659 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), attribute, rec);
660 }
661 EXPORT_SYMBOL(ib_sa_unpack_path);
662
663 void ib_sa_pack_path(struct ib_sa_path_rec *rec, void *attribute)
664 {
665 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, attribute);
666 }
667 EXPORT_SYMBOL(ib_sa_pack_path);
668
669 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
670 int status,
671 struct ib_sa_mad *mad)
672 {
673 struct ib_sa_path_query *query =
674 container_of(sa_query, struct ib_sa_path_query, sa_query);
675
676 if (mad) {
677 struct ib_sa_path_rec rec;
678
679 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
680 mad->data, &rec);
681 rec.vlan_id = 0xffff;
682 memset(rec.dmac, 0, ETH_ALEN);
683 memset(rec.smac, 0, ETH_ALEN);
684 query->callback(status, &rec, query->context);
685 } else
686 query->callback(status, NULL, query->context);
687 }
688
689 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
690 {
691 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query));
692 }
693
694 /**
695 * ib_sa_path_rec_get - Start a Path get query
696 * @client:SA client
697 * @device:device to send query on
698 * @port_num: port number to send query on
699 * @rec:Path Record to send in query
700 * @comp_mask:component mask to send in query
701 * @timeout_ms:time to wait for response
702 * @gfp_mask:GFP mask to use for internal allocations
703 * @callback:function called when query completes, times out or is
704 * canceled
705 * @context:opaque user context passed to callback
706 * @sa_query:query context, used to cancel query
707 *
708 * Send a Path Record Get query to the SA to look up a path. The
709 * callback function will be called when the query completes (or
710 * fails); status is 0 for a successful response, -EINTR if the query
711 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
712 * occurred sending the query. The resp parameter of the callback is
713 * only valid if status is 0.
714 *
715 * If the return value of ib_sa_path_rec_get() is negative, it is an
716 * error code. Otherwise it is a query ID that can be used to cancel
717 * the query.
718 */
719 int ib_sa_path_rec_get(struct ib_sa_client *client,
720 struct ib_device *device, u8 port_num,
721 struct ib_sa_path_rec *rec,
722 ib_sa_comp_mask comp_mask,
723 int timeout_ms, gfp_t gfp_mask,
724 void (*callback)(int status,
725 struct ib_sa_path_rec *resp,
726 void *context),
727 void *context,
728 struct ib_sa_query **sa_query)
729 {
730 struct ib_sa_path_query *query;
731 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
732 struct ib_sa_port *port;
733 struct ib_mad_agent *agent;
734 struct ib_sa_mad *mad;
735 int ret;
736
737 if (!sa_dev)
738 return -ENODEV;
739
740 port = &sa_dev->port[port_num - sa_dev->start_port];
741 agent = port->agent;
742
743 query = kmalloc(sizeof *query, gfp_mask);
744 if (!query)
745 return -ENOMEM;
746
747 query->sa_query.port = port;
748 ret = alloc_mad(&query->sa_query, gfp_mask);
749 if (ret)
750 goto err1;
751
752 ib_sa_client_get(client);
753 query->sa_query.client = client;
754 query->callback = callback;
755 query->context = context;
756
757 mad = query->sa_query.mad_buf->mad;
758 init_mad(mad, agent);
759
760 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
761 query->sa_query.release = ib_sa_path_rec_release;
762 mad->mad_hdr.method = IB_MGMT_METHOD_GET;
763 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC);
764 mad->sa_hdr.comp_mask = comp_mask;
765
766 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data);
767
768 *sa_query = &query->sa_query;
769
770 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
771 if (ret < 0)
772 goto err2;
773
774 return ret;
775
776 err2:
777 *sa_query = NULL;
778 ib_sa_client_put(query->sa_query.client);
779 free_mad(&query->sa_query);
780
781 err1:
782 kfree(query);
783 return ret;
784 }
785 EXPORT_SYMBOL(ib_sa_path_rec_get);
786
787 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query,
788 int status,
789 struct ib_sa_mad *mad)
790 {
791 struct ib_sa_service_query *query =
792 container_of(sa_query, struct ib_sa_service_query, sa_query);
793
794 if (mad) {
795 struct ib_sa_service_rec rec;
796
797 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table),
798 mad->data, &rec);
799 query->callback(status, &rec, query->context);
800 } else
801 query->callback(status, NULL, query->context);
802 }
803
804 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query)
805 {
806 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query));
807 }
808
809 /**
810 * ib_sa_service_rec_query - Start Service Record operation
811 * @client:SA client
812 * @device:device to send request on
813 * @port_num: port number to send request on
814 * @method:SA method - should be get, set, or delete
815 * @rec:Service Record to send in request
816 * @comp_mask:component mask to send in request
817 * @timeout_ms:time to wait for response
818 * @gfp_mask:GFP mask to use for internal allocations
819 * @callback:function called when request completes, times out or is
820 * canceled
821 * @context:opaque user context passed to callback
822 * @sa_query:request context, used to cancel request
823 *
824 * Send a Service Record set/get/delete to the SA to register,
825 * unregister or query a service record.
826 * The callback function will be called when the request completes (or
827 * fails); status is 0 for a successful response, -EINTR if the query
828 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
829 * occurred sending the query. The resp parameter of the callback is
830 * only valid if status is 0.
831 *
832 * If the return value of ib_sa_service_rec_query() is negative, it is an
833 * error code. Otherwise it is a request ID that can be used to cancel
834 * the query.
835 */
836 int ib_sa_service_rec_query(struct ib_sa_client *client,
837 struct ib_device *device, u8 port_num, u8 method,
838 struct ib_sa_service_rec *rec,
839 ib_sa_comp_mask comp_mask,
840 int timeout_ms, gfp_t gfp_mask,
841 void (*callback)(int status,
842 struct ib_sa_service_rec *resp,
843 void *context),
844 void *context,
845 struct ib_sa_query **sa_query)
846 {
847 struct ib_sa_service_query *query;
848 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
849 struct ib_sa_port *port;
850 struct ib_mad_agent *agent;
851 struct ib_sa_mad *mad;
852 int ret;
853
854 if (!sa_dev)
855 return -ENODEV;
856
857 port = &sa_dev->port[port_num - sa_dev->start_port];
858 agent = port->agent;
859
860 if (method != IB_MGMT_METHOD_GET &&
861 method != IB_MGMT_METHOD_SET &&
862 method != IB_SA_METHOD_DELETE)
863 return -EINVAL;
864
865 query = kmalloc(sizeof *query, gfp_mask);
866 if (!query)
867 return -ENOMEM;
868
869 query->sa_query.port = port;
870 ret = alloc_mad(&query->sa_query, gfp_mask);
871 if (ret)
872 goto err1;
873
874 ib_sa_client_get(client);
875 query->sa_query.client = client;
876 query->callback = callback;
877 query->context = context;
878
879 mad = query->sa_query.mad_buf->mad;
880 init_mad(mad, agent);
881
882 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
883 query->sa_query.release = ib_sa_service_rec_release;
884 mad->mad_hdr.method = method;
885 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
886 mad->sa_hdr.comp_mask = comp_mask;
887
888 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table),
889 rec, mad->data);
890
891 *sa_query = &query->sa_query;
892
893 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
894 if (ret < 0)
895 goto err2;
896
897 return ret;
898
899 err2:
900 *sa_query = NULL;
901 ib_sa_client_put(query->sa_query.client);
902 free_mad(&query->sa_query);
903
904 err1:
905 kfree(query);
906 return ret;
907 }
908 EXPORT_SYMBOL(ib_sa_service_rec_query);
909
910 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
911 int status,
912 struct ib_sa_mad *mad)
913 {
914 struct ib_sa_mcmember_query *query =
915 container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
916
917 if (mad) {
918 struct ib_sa_mcmember_rec rec;
919
920 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
921 mad->data, &rec);
922 query->callback(status, &rec, query->context);
923 } else
924 query->callback(status, NULL, query->context);
925 }
926
927 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
928 {
929 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
930 }
931
932 int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
933 struct ib_device *device, u8 port_num,
934 u8 method,
935 struct ib_sa_mcmember_rec *rec,
936 ib_sa_comp_mask comp_mask,
937 int timeout_ms, gfp_t gfp_mask,
938 void (*callback)(int status,
939 struct ib_sa_mcmember_rec *resp,
940 void *context),
941 void *context,
942 struct ib_sa_query **sa_query)
943 {
944 struct ib_sa_mcmember_query *query;
945 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
946 struct ib_sa_port *port;
947 struct ib_mad_agent *agent;
948 struct ib_sa_mad *mad;
949 int ret;
950
951 if (!sa_dev)
952 return -ENODEV;
953
954 port = &sa_dev->port[port_num - sa_dev->start_port];
955 agent = port->agent;
956
957 query = kmalloc(sizeof *query, gfp_mask);
958 if (!query)
959 return -ENOMEM;
960
961 query->sa_query.port = port;
962 ret = alloc_mad(&query->sa_query, gfp_mask);
963 if (ret)
964 goto err1;
965
966 ib_sa_client_get(client);
967 query->sa_query.client = client;
968 query->callback = callback;
969 query->context = context;
970
971 mad = query->sa_query.mad_buf->mad;
972 init_mad(mad, agent);
973
974 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
975 query->sa_query.release = ib_sa_mcmember_rec_release;
976 mad->mad_hdr.method = method;
977 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
978 mad->sa_hdr.comp_mask = comp_mask;
979
980 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
981 rec, mad->data);
982
983 *sa_query = &query->sa_query;
984
985 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
986 if (ret < 0)
987 goto err2;
988
989 return ret;
990
991 err2:
992 *sa_query = NULL;
993 ib_sa_client_put(query->sa_query.client);
994 free_mad(&query->sa_query);
995
996 err1:
997 kfree(query);
998 return ret;
999 }
1000
1001 /* Support GuidInfoRecord */
1002 static void ib_sa_guidinfo_rec_callback(struct ib_sa_query *sa_query,
1003 int status,
1004 struct ib_sa_mad *mad)
1005 {
1006 struct ib_sa_guidinfo_query *query =
1007 container_of(sa_query, struct ib_sa_guidinfo_query, sa_query);
1008
1009 if (mad) {
1010 struct ib_sa_guidinfo_rec rec;
1011
1012 ib_unpack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table),
1013 mad->data, &rec);
1014 query->callback(status, &rec, query->context);
1015 } else
1016 query->callback(status, NULL, query->context);
1017 }
1018
1019 static void ib_sa_guidinfo_rec_release(struct ib_sa_query *sa_query)
1020 {
1021 kfree(container_of(sa_query, struct ib_sa_guidinfo_query, sa_query));
1022 }
1023
1024 int ib_sa_guid_info_rec_query(struct ib_sa_client *client,
1025 struct ib_device *device, u8 port_num,
1026 struct ib_sa_guidinfo_rec *rec,
1027 ib_sa_comp_mask comp_mask, u8 method,
1028 int timeout_ms, gfp_t gfp_mask,
1029 void (*callback)(int status,
1030 struct ib_sa_guidinfo_rec *resp,
1031 void *context),
1032 void *context,
1033 struct ib_sa_query **sa_query)
1034 {
1035 struct ib_sa_guidinfo_query *query;
1036 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1037 struct ib_sa_port *port;
1038 struct ib_mad_agent *agent;
1039 struct ib_sa_mad *mad;
1040 int ret;
1041
1042 if (!sa_dev)
1043 return -ENODEV;
1044
1045 if (method != IB_MGMT_METHOD_GET &&
1046 method != IB_MGMT_METHOD_SET &&
1047 method != IB_SA_METHOD_DELETE) {
1048 return -EINVAL;
1049 }
1050
1051 port = &sa_dev->port[port_num - sa_dev->start_port];
1052 agent = port->agent;
1053
1054 query = kmalloc(sizeof *query, gfp_mask);
1055 if (!query)
1056 return -ENOMEM;
1057
1058 query->sa_query.port = port;
1059 ret = alloc_mad(&query->sa_query, gfp_mask);
1060 if (ret)
1061 goto err1;
1062
1063 ib_sa_client_get(client);
1064 query->sa_query.client = client;
1065 query->callback = callback;
1066 query->context = context;
1067
1068 mad = query->sa_query.mad_buf->mad;
1069 init_mad(mad, agent);
1070
1071 query->sa_query.callback = callback ? ib_sa_guidinfo_rec_callback : NULL;
1072 query->sa_query.release = ib_sa_guidinfo_rec_release;
1073
1074 mad->mad_hdr.method = method;
1075 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_GUID_INFO_REC);
1076 mad->sa_hdr.comp_mask = comp_mask;
1077
1078 ib_pack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table), rec,
1079 mad->data);
1080
1081 *sa_query = &query->sa_query;
1082
1083 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1084 if (ret < 0)
1085 goto err2;
1086
1087 return ret;
1088
1089 err2:
1090 *sa_query = NULL;
1091 ib_sa_client_put(query->sa_query.client);
1092 free_mad(&query->sa_query);
1093
1094 err1:
1095 kfree(query);
1096 return ret;
1097 }
1098 EXPORT_SYMBOL(ib_sa_guid_info_rec_query);
1099
1100 static void send_handler(struct ib_mad_agent *agent,
1101 struct ib_mad_send_wc *mad_send_wc)
1102 {
1103 struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
1104 unsigned long flags;
1105
1106 if (query->callback)
1107 switch (mad_send_wc->status) {
1108 case IB_WC_SUCCESS:
1109 /* No callback -- already got recv */
1110 break;
1111 case IB_WC_RESP_TIMEOUT_ERR:
1112 query->callback(query, -ETIMEDOUT, NULL);
1113 break;
1114 case IB_WC_WR_FLUSH_ERR:
1115 query->callback(query, -EINTR, NULL);
1116 break;
1117 default:
1118 query->callback(query, -EIO, NULL);
1119 break;
1120 }
1121
1122 spin_lock_irqsave(&idr_lock, flags);
1123 idr_remove(&query_idr, query->id);
1124 spin_unlock_irqrestore(&idr_lock, flags);
1125
1126 free_mad(query);
1127 ib_sa_client_put(query->client);
1128 query->release(query);
1129 }
1130
1131 static void recv_handler(struct ib_mad_agent *mad_agent,
1132 struct ib_mad_recv_wc *mad_recv_wc)
1133 {
1134 struct ib_sa_query *query;
1135 struct ib_mad_send_buf *mad_buf;
1136
1137 mad_buf = (void *) (unsigned long) mad_recv_wc->wc->wr_id;
1138 query = mad_buf->context[0];
1139
1140 if (query->callback) {
1141 if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
1142 query->callback(query,
1143 mad_recv_wc->recv_buf.mad->mad_hdr.status ?
1144 -EINVAL : 0,
1145 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
1146 else
1147 query->callback(query, -EIO, NULL);
1148 }
1149
1150 ib_free_recv_mad(mad_recv_wc);
1151 }
1152
1153 static void ib_sa_add_one(struct ib_device *device)
1154 {
1155 struct ib_sa_device *sa_dev;
1156 int s, e, i;
1157 int count = 0;
1158
1159 s = rdma_start_port(device);
1160 e = rdma_end_port(device);
1161
1162 sa_dev = kzalloc(sizeof *sa_dev +
1163 (e - s + 1) * sizeof (struct ib_sa_port),
1164 GFP_KERNEL);
1165 if (!sa_dev)
1166 return;
1167
1168 sa_dev->start_port = s;
1169 sa_dev->end_port = e;
1170
1171 for (i = 0; i <= e - s; ++i) {
1172 spin_lock_init(&sa_dev->port[i].ah_lock);
1173 if (!rdma_cap_ib_sa(device, i + 1))
1174 continue;
1175
1176 sa_dev->port[i].sm_ah = NULL;
1177 sa_dev->port[i].port_num = i + s;
1178
1179 sa_dev->port[i].agent =
1180 ib_register_mad_agent(device, i + s, IB_QPT_GSI,
1181 NULL, 0, send_handler,
1182 recv_handler, sa_dev, 0);
1183 if (IS_ERR(sa_dev->port[i].agent))
1184 goto err;
1185
1186 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah);
1187
1188 count++;
1189 }
1190
1191 if (!count)
1192 goto free;
1193
1194 ib_set_client_data(device, &sa_client, sa_dev);
1195
1196 /*
1197 * We register our event handler after everything is set up,
1198 * and then update our cached info after the event handler is
1199 * registered to avoid any problems if a port changes state
1200 * during our initialization.
1201 */
1202
1203 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
1204 if (ib_register_event_handler(&sa_dev->event_handler))
1205 goto err;
1206
1207 for (i = 0; i <= e - s; ++i) {
1208 if (rdma_cap_ib_sa(device, i + 1))
1209 update_sm_ah(&sa_dev->port[i].update_task);
1210 }
1211
1212 return;
1213
1214 err:
1215 while (--i >= 0) {
1216 if (rdma_cap_ib_sa(device, i + 1))
1217 ib_unregister_mad_agent(sa_dev->port[i].agent);
1218 }
1219 free:
1220 kfree(sa_dev);
1221 return;
1222 }
1223
1224 static void ib_sa_remove_one(struct ib_device *device)
1225 {
1226 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1227 int i;
1228
1229 if (!sa_dev)
1230 return;
1231
1232 ib_unregister_event_handler(&sa_dev->event_handler);
1233
1234 flush_workqueue(ib_wq);
1235
1236 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
1237 if (rdma_cap_ib_sa(device, i + 1)) {
1238 ib_unregister_mad_agent(sa_dev->port[i].agent);
1239 if (sa_dev->port[i].sm_ah)
1240 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
1241 }
1242
1243 }
1244
1245 kfree(sa_dev);
1246 }
1247
1248 static int __init ib_sa_init(void)
1249 {
1250 int ret;
1251
1252 get_random_bytes(&tid, sizeof tid);
1253
1254 ret = ib_register_client(&sa_client);
1255 if (ret) {
1256 printk(KERN_ERR "Couldn't register ib_sa client\n");
1257 goto err1;
1258 }
1259
1260 ret = mcast_init();
1261 if (ret) {
1262 printk(KERN_ERR "Couldn't initialize multicast handling\n");
1263 goto err2;
1264 }
1265
1266 return 0;
1267 err2:
1268 ib_unregister_client(&sa_client);
1269 err1:
1270 return ret;
1271 }
1272
1273 static void __exit ib_sa_cleanup(void)
1274 {
1275 mcast_cleanup();
1276 ib_unregister_client(&sa_client);
1277 idr_destroy(&query_idr);
1278 }
1279
1280 module_init(ib_sa_init);
1281 module_exit(ib_sa_cleanup);
Linux kernel - Deliverables
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