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[mirror_ubuntu-bionic-kernel.git] / drivers / infiniband / core / sa_query.c
1 /*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 * $Id: sa_query.c 1389 2004-12-27 22:56:47Z roland $
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/pci.h>
42 #include <linux/dma-mapping.h>
43 #include <linux/kref.h>
44 #include <linux/idr.h>
45
46 #include <ib_pack.h>
47 #include <ib_sa.h>
48
49 MODULE_AUTHOR("Roland Dreier");
50 MODULE_DESCRIPTION("InfiniBand subnet administration query support");
51 MODULE_LICENSE("Dual BSD/GPL");
52
53 /*
54 * These two structures must be packed because they have 64-bit fields
55 * that are only 32-bit aligned. 64-bit architectures will lay them
56 * out wrong otherwise. (And unfortunately they are sent on the wire
57 * so we can't change the layout)
58 */
59 struct ib_sa_hdr {
60 u64 sm_key;
61 u16 attr_offset;
62 u16 reserved;
63 ib_sa_comp_mask comp_mask;
64 } __attribute__ ((packed));
65
66 struct ib_sa_mad {
67 struct ib_mad_hdr mad_hdr;
68 struct ib_rmpp_hdr rmpp_hdr;
69 struct ib_sa_hdr sa_hdr;
70 u8 data[200];
71 } __attribute__ ((packed));
72
73 struct ib_sa_sm_ah {
74 struct ib_ah *ah;
75 struct kref ref;
76 };
77
78 struct ib_sa_port {
79 struct ib_mad_agent *agent;
80 struct ib_mr *mr;
81 struct ib_sa_sm_ah *sm_ah;
82 struct work_struct update_task;
83 spinlock_t ah_lock;
84 u8 port_num;
85 };
86
87 struct ib_sa_device {
88 int start_port, end_port;
89 struct ib_event_handler event_handler;
90 struct ib_sa_port port[0];
91 };
92
93 struct ib_sa_query {
94 void (*callback)(struct ib_sa_query *, int, struct ib_sa_mad *);
95 void (*release)(struct ib_sa_query *);
96 struct ib_sa_port *port;
97 struct ib_sa_mad *mad;
98 struct ib_sa_sm_ah *sm_ah;
99 DECLARE_PCI_UNMAP_ADDR(mapping)
100 int id;
101 };
102
103 struct ib_sa_path_query {
104 void (*callback)(int, struct ib_sa_path_rec *, void *);
105 void *context;
106 struct ib_sa_query sa_query;
107 };
108
109 struct ib_sa_mcmember_query {
110 void (*callback)(int, struct ib_sa_mcmember_rec *, void *);
111 void *context;
112 struct ib_sa_query sa_query;
113 };
114
115 static void ib_sa_add_one(struct ib_device *device);
116 static void ib_sa_remove_one(struct ib_device *device);
117
118 static struct ib_client sa_client = {
119 .name = "sa",
120 .add = ib_sa_add_one,
121 .remove = ib_sa_remove_one
122 };
123
124 static spinlock_t idr_lock;
125 static DEFINE_IDR(query_idr);
126
127 static spinlock_t tid_lock;
128 static u32 tid;
129
130 enum {
131 IB_SA_ATTR_CLASS_PORTINFO = 0x01,
132 IB_SA_ATTR_NOTICE = 0x02,
133 IB_SA_ATTR_INFORM_INFO = 0x03,
134 IB_SA_ATTR_NODE_REC = 0x11,
135 IB_SA_ATTR_PORT_INFO_REC = 0x12,
136 IB_SA_ATTR_SL2VL_REC = 0x13,
137 IB_SA_ATTR_SWITCH_REC = 0x14,
138 IB_SA_ATTR_LINEAR_FDB_REC = 0x15,
139 IB_SA_ATTR_RANDOM_FDB_REC = 0x16,
140 IB_SA_ATTR_MCAST_FDB_REC = 0x17,
141 IB_SA_ATTR_SM_INFO_REC = 0x18,
142 IB_SA_ATTR_LINK_REC = 0x20,
143 IB_SA_ATTR_GUID_INFO_REC = 0x30,
144 IB_SA_ATTR_SERVICE_REC = 0x31,
145 IB_SA_ATTR_PARTITION_REC = 0x33,
146 IB_SA_ATTR_RANGE_REC = 0x34,
147 IB_SA_ATTR_PATH_REC = 0x35,
148 IB_SA_ATTR_VL_ARB_REC = 0x36,
149 IB_SA_ATTR_MC_GROUP_REC = 0x37,
150 IB_SA_ATTR_MC_MEMBER_REC = 0x38,
151 IB_SA_ATTR_TRACE_REC = 0x39,
152 IB_SA_ATTR_MULTI_PATH_REC = 0x3a,
153 IB_SA_ATTR_SERVICE_ASSOC_REC = 0x3b
154 };
155
156 #define PATH_REC_FIELD(field) \
157 .struct_offset_bytes = offsetof(struct ib_sa_path_rec, field), \
158 .struct_size_bytes = sizeof ((struct ib_sa_path_rec *) 0)->field, \
159 .field_name = "sa_path_rec:" #field
160
161 static const struct ib_field path_rec_table[] = {
162 { RESERVED,
163 .offset_words = 0,
164 .offset_bits = 0,
165 .size_bits = 32 },
166 { RESERVED,
167 .offset_words = 1,
168 .offset_bits = 0,
169 .size_bits = 32 },
170 { PATH_REC_FIELD(dgid),
171 .offset_words = 2,
172 .offset_bits = 0,
173 .size_bits = 128 },
174 { PATH_REC_FIELD(sgid),
175 .offset_words = 6,
176 .offset_bits = 0,
177 .size_bits = 128 },
178 { PATH_REC_FIELD(dlid),
179 .offset_words = 10,
180 .offset_bits = 0,
181 .size_bits = 16 },
182 { PATH_REC_FIELD(slid),
183 .offset_words = 10,
184 .offset_bits = 16,
185 .size_bits = 16 },
186 { PATH_REC_FIELD(raw_traffic),
187 .offset_words = 11,
188 .offset_bits = 0,
189 .size_bits = 1 },
190 { RESERVED,
191 .offset_words = 11,
192 .offset_bits = 1,
193 .size_bits = 3 },
194 { PATH_REC_FIELD(flow_label),
195 .offset_words = 11,
196 .offset_bits = 4,
197 .size_bits = 20 },
198 { PATH_REC_FIELD(hop_limit),
199 .offset_words = 11,
200 .offset_bits = 24,
201 .size_bits = 8 },
202 { PATH_REC_FIELD(traffic_class),
203 .offset_words = 12,
204 .offset_bits = 0,
205 .size_bits = 8 },
206 { PATH_REC_FIELD(reversible),
207 .offset_words = 12,
208 .offset_bits = 8,
209 .size_bits = 1 },
210 { PATH_REC_FIELD(numb_path),
211 .offset_words = 12,
212 .offset_bits = 9,
213 .size_bits = 7 },
214 { PATH_REC_FIELD(pkey),
215 .offset_words = 12,
216 .offset_bits = 16,
217 .size_bits = 16 },
218 { RESERVED,
219 .offset_words = 13,
220 .offset_bits = 0,
221 .size_bits = 12 },
222 { PATH_REC_FIELD(sl),
223 .offset_words = 13,
224 .offset_bits = 12,
225 .size_bits = 4 },
226 { PATH_REC_FIELD(mtu_selector),
227 .offset_words = 13,
228 .offset_bits = 16,
229 .size_bits = 2 },
230 { PATH_REC_FIELD(mtu),
231 .offset_words = 13,
232 .offset_bits = 18,
233 .size_bits = 6 },
234 { PATH_REC_FIELD(rate_selector),
235 .offset_words = 13,
236 .offset_bits = 24,
237 .size_bits = 2 },
238 { PATH_REC_FIELD(rate),
239 .offset_words = 13,
240 .offset_bits = 26,
241 .size_bits = 6 },
242 { PATH_REC_FIELD(packet_life_time_selector),
243 .offset_words = 14,
244 .offset_bits = 0,
245 .size_bits = 2 },
246 { PATH_REC_FIELD(packet_life_time),
247 .offset_words = 14,
248 .offset_bits = 2,
249 .size_bits = 6 },
250 { PATH_REC_FIELD(preference),
251 .offset_words = 14,
252 .offset_bits = 8,
253 .size_bits = 8 },
254 { RESERVED,
255 .offset_words = 14,
256 .offset_bits = 16,
257 .size_bits = 48 },
258 };
259
260 #define MCMEMBER_REC_FIELD(field) \
261 .struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field), \
262 .struct_size_bytes = sizeof ((struct ib_sa_mcmember_rec *) 0)->field, \
263 .field_name = "sa_mcmember_rec:" #field
264
265 static const struct ib_field mcmember_rec_table[] = {
266 { MCMEMBER_REC_FIELD(mgid),
267 .offset_words = 0,
268 .offset_bits = 0,
269 .size_bits = 128 },
270 { MCMEMBER_REC_FIELD(port_gid),
271 .offset_words = 4,
272 .offset_bits = 0,
273 .size_bits = 128 },
274 { MCMEMBER_REC_FIELD(qkey),
275 .offset_words = 8,
276 .offset_bits = 0,
277 .size_bits = 32 },
278 { MCMEMBER_REC_FIELD(mlid),
279 .offset_words = 9,
280 .offset_bits = 0,
281 .size_bits = 16 },
282 { MCMEMBER_REC_FIELD(mtu_selector),
283 .offset_words = 9,
284 .offset_bits = 16,
285 .size_bits = 2 },
286 { MCMEMBER_REC_FIELD(mtu),
287 .offset_words = 9,
288 .offset_bits = 18,
289 .size_bits = 6 },
290 { MCMEMBER_REC_FIELD(traffic_class),
291 .offset_words = 9,
292 .offset_bits = 24,
293 .size_bits = 8 },
294 { MCMEMBER_REC_FIELD(pkey),
295 .offset_words = 10,
296 .offset_bits = 0,
297 .size_bits = 16 },
298 { MCMEMBER_REC_FIELD(rate_selector),
299 .offset_words = 10,
300 .offset_bits = 16,
301 .size_bits = 2 },
302 { MCMEMBER_REC_FIELD(rate),
303 .offset_words = 10,
304 .offset_bits = 18,
305 .size_bits = 6 },
306 { MCMEMBER_REC_FIELD(packet_life_time_selector),
307 .offset_words = 10,
308 .offset_bits = 24,
309 .size_bits = 2 },
310 { MCMEMBER_REC_FIELD(packet_life_time),
311 .offset_words = 10,
312 .offset_bits = 26,
313 .size_bits = 6 },
314 { MCMEMBER_REC_FIELD(sl),
315 .offset_words = 11,
316 .offset_bits = 0,
317 .size_bits = 4 },
318 { MCMEMBER_REC_FIELD(flow_label),
319 .offset_words = 11,
320 .offset_bits = 4,
321 .size_bits = 20 },
322 { MCMEMBER_REC_FIELD(hop_limit),
323 .offset_words = 11,
324 .offset_bits = 24,
325 .size_bits = 8 },
326 { MCMEMBER_REC_FIELD(scope),
327 .offset_words = 12,
328 .offset_bits = 0,
329 .size_bits = 4 },
330 { MCMEMBER_REC_FIELD(join_state),
331 .offset_words = 12,
332 .offset_bits = 4,
333 .size_bits = 4 },
334 { MCMEMBER_REC_FIELD(proxy_join),
335 .offset_words = 12,
336 .offset_bits = 8,
337 .size_bits = 1 },
338 { RESERVED,
339 .offset_words = 12,
340 .offset_bits = 9,
341 .size_bits = 23 },
342 };
343
344 static void free_sm_ah(struct kref *kref)
345 {
346 struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref);
347
348 ib_destroy_ah(sm_ah->ah);
349 kfree(sm_ah);
350 }
351
352 static void update_sm_ah(void *port_ptr)
353 {
354 struct ib_sa_port *port = port_ptr;
355 struct ib_sa_sm_ah *new_ah, *old_ah;
356 struct ib_port_attr port_attr;
357 struct ib_ah_attr ah_attr;
358
359 if (ib_query_port(port->agent->device, port->port_num, &port_attr)) {
360 printk(KERN_WARNING "Couldn't query port\n");
361 return;
362 }
363
364 new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL);
365 if (!new_ah) {
366 printk(KERN_WARNING "Couldn't allocate new SM AH\n");
367 return;
368 }
369
370 kref_init(&new_ah->ref);
371
372 memset(&ah_attr, 0, sizeof ah_attr);
373 ah_attr.dlid = port_attr.sm_lid;
374 ah_attr.sl = port_attr.sm_sl;
375 ah_attr.port_num = port->port_num;
376
377 new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr);
378 if (IS_ERR(new_ah->ah)) {
379 printk(KERN_WARNING "Couldn't create new SM AH\n");
380 kfree(new_ah);
381 return;
382 }
383
384 spin_lock_irq(&port->ah_lock);
385 old_ah = port->sm_ah;
386 port->sm_ah = new_ah;
387 spin_unlock_irq(&port->ah_lock);
388
389 if (old_ah)
390 kref_put(&old_ah->ref, free_sm_ah);
391 }
392
393 static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event)
394 {
395 if (event->event == IB_EVENT_PORT_ERR ||
396 event->event == IB_EVENT_PORT_ACTIVE ||
397 event->event == IB_EVENT_LID_CHANGE ||
398 event->event == IB_EVENT_PKEY_CHANGE ||
399 event->event == IB_EVENT_SM_CHANGE) {
400 struct ib_sa_device *sa_dev =
401 ib_get_client_data(event->device, &sa_client);
402
403 schedule_work(&sa_dev->port[event->element.port_num -
404 sa_dev->start_port].update_task);
405 }
406 }
407
408 /**
409 * ib_sa_cancel_query - try to cancel an SA query
410 * @id:ID of query to cancel
411 * @query:query pointer to cancel
412 *
413 * Try to cancel an SA query. If the id and query don't match up or
414 * the query has already completed, nothing is done. Otherwise the
415 * query is canceled and will complete with a status of -EINTR.
416 */
417 void ib_sa_cancel_query(int id, struct ib_sa_query *query)
418 {
419 unsigned long flags;
420 struct ib_mad_agent *agent;
421
422 spin_lock_irqsave(&idr_lock, flags);
423 if (idr_find(&query_idr, id) != query) {
424 spin_unlock_irqrestore(&idr_lock, flags);
425 return;
426 }
427 agent = query->port->agent;
428 spin_unlock_irqrestore(&idr_lock, flags);
429
430 ib_cancel_mad(agent, id);
431 }
432 EXPORT_SYMBOL(ib_sa_cancel_query);
433
434 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
435 {
436 unsigned long flags;
437
438 memset(mad, 0, sizeof *mad);
439
440 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION;
441 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
442 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
443
444 spin_lock_irqsave(&tid_lock, flags);
445 mad->mad_hdr.tid =
446 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
447 spin_unlock_irqrestore(&tid_lock, flags);
448 }
449
450 static int send_mad(struct ib_sa_query *query, int timeout_ms)
451 {
452 struct ib_sa_port *port = query->port;
453 unsigned long flags;
454 int ret;
455 struct ib_sge gather_list;
456 struct ib_send_wr *bad_wr, wr = {
457 .opcode = IB_WR_SEND,
458 .sg_list = &gather_list,
459 .num_sge = 1,
460 .send_flags = IB_SEND_SIGNALED,
461 .wr = {
462 .ud = {
463 .mad_hdr = &query->mad->mad_hdr,
464 .remote_qpn = 1,
465 .remote_qkey = IB_QP1_QKEY,
466 .timeout_ms = timeout_ms
467 }
468 }
469 };
470
471 retry:
472 if (!idr_pre_get(&query_idr, GFP_ATOMIC))
473 return -ENOMEM;
474 spin_lock_irqsave(&idr_lock, flags);
475 ret = idr_get_new(&query_idr, query, &query->id);
476 spin_unlock_irqrestore(&idr_lock, flags);
477 if (ret == -EAGAIN)
478 goto retry;
479 if (ret)
480 return ret;
481
482 wr.wr_id = query->id;
483
484 spin_lock_irqsave(&port->ah_lock, flags);
485 kref_get(&port->sm_ah->ref);
486 query->sm_ah = port->sm_ah;
487 wr.wr.ud.ah = port->sm_ah->ah;
488 spin_unlock_irqrestore(&port->ah_lock, flags);
489
490 gather_list.addr = dma_map_single(port->agent->device->dma_device,
491 query->mad,
492 sizeof (struct ib_sa_mad),
493 DMA_TO_DEVICE);
494 gather_list.length = sizeof (struct ib_sa_mad);
495 gather_list.lkey = port->mr->lkey;
496 pci_unmap_addr_set(query, mapping, gather_list.addr);
497
498 ret = ib_post_send_mad(port->agent, &wr, &bad_wr);
499 if (ret) {
500 dma_unmap_single(port->agent->device->dma_device,
501 pci_unmap_addr(query, mapping),
502 sizeof (struct ib_sa_mad),
503 DMA_TO_DEVICE);
504 kref_put(&query->sm_ah->ref, free_sm_ah);
505 spin_lock_irqsave(&idr_lock, flags);
506 idr_remove(&query_idr, query->id);
507 spin_unlock_irqrestore(&idr_lock, flags);
508 }
509
510 /*
511 * It's not safe to dereference query any more, because the
512 * send may already have completed and freed the query in
513 * another context. So use wr.wr_id, which has a copy of the
514 * query's id.
515 */
516 return ret ? ret : wr.wr_id;
517 }
518
519 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
520 int status,
521 struct ib_sa_mad *mad)
522 {
523 struct ib_sa_path_query *query =
524 container_of(sa_query, struct ib_sa_path_query, sa_query);
525
526 if (mad) {
527 struct ib_sa_path_rec rec;
528
529 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
530 mad->data, &rec);
531 query->callback(status, &rec, query->context);
532 } else
533 query->callback(status, NULL, query->context);
534 }
535
536 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
537 {
538 kfree(sa_query->mad);
539 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query));
540 }
541
542 /**
543 * ib_sa_path_rec_get - Start a Path get query
544 * @device:device to send query on
545 * @port_num: port number to send query on
546 * @rec:Path Record to send in query
547 * @comp_mask:component mask to send in query
548 * @timeout_ms:time to wait for response
549 * @gfp_mask:GFP mask to use for internal allocations
550 * @callback:function called when query completes, times out or is
551 * canceled
552 * @context:opaque user context passed to callback
553 * @sa_query:query context, used to cancel query
554 *
555 * Send a Path Record Get query to the SA to look up a path. The
556 * callback function will be called when the query completes (or
557 * fails); status is 0 for a successful response, -EINTR if the query
558 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
559 * occurred sending the query. The resp parameter of the callback is
560 * only valid if status is 0.
561 *
562 * If the return value of ib_sa_path_rec_get() is negative, it is an
563 * error code. Otherwise it is a query ID that can be used to cancel
564 * the query.
565 */
566 int ib_sa_path_rec_get(struct ib_device *device, u8 port_num,
567 struct ib_sa_path_rec *rec,
568 ib_sa_comp_mask comp_mask,
569 int timeout_ms, int gfp_mask,
570 void (*callback)(int status,
571 struct ib_sa_path_rec *resp,
572 void *context),
573 void *context,
574 struct ib_sa_query **sa_query)
575 {
576 struct ib_sa_path_query *query;
577 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
578 struct ib_sa_port *port = &sa_dev->port[port_num - sa_dev->start_port];
579 struct ib_mad_agent *agent = port->agent;
580 int ret;
581
582 query = kmalloc(sizeof *query, gfp_mask);
583 if (!query)
584 return -ENOMEM;
585 query->sa_query.mad = kmalloc(sizeof *query->sa_query.mad, gfp_mask);
586 if (!query->sa_query.mad) {
587 kfree(query);
588 return -ENOMEM;
589 }
590
591 query->callback = callback;
592 query->context = context;
593
594 init_mad(query->sa_query.mad, agent);
595
596 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
597 query->sa_query.release = ib_sa_path_rec_release;
598 query->sa_query.port = port;
599 query->sa_query.mad->mad_hdr.method = IB_MGMT_METHOD_GET;
600 query->sa_query.mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC);
601 query->sa_query.mad->sa_hdr.comp_mask = comp_mask;
602
603 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table),
604 rec, query->sa_query.mad->data);
605
606 *sa_query = &query->sa_query;
607
608 ret = send_mad(&query->sa_query, timeout_ms);
609 if (ret < 0) {
610 *sa_query = NULL;
611 kfree(query->sa_query.mad);
612 kfree(query);
613 }
614
615 return ret;
616 }
617 EXPORT_SYMBOL(ib_sa_path_rec_get);
618
619 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
620 int status,
621 struct ib_sa_mad *mad)
622 {
623 struct ib_sa_mcmember_query *query =
624 container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
625
626 if (mad) {
627 struct ib_sa_mcmember_rec rec;
628
629 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_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_mcmember_rec_release(struct ib_sa_query *sa_query)
637 {
638 kfree(sa_query->mad);
639 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
640 }
641
642 int ib_sa_mcmember_rec_query(struct ib_device *device, u8 port_num,
643 u8 method,
644 struct ib_sa_mcmember_rec *rec,
645 ib_sa_comp_mask comp_mask,
646 int timeout_ms, int gfp_mask,
647 void (*callback)(int status,
648 struct ib_sa_mcmember_rec *resp,
649 void *context),
650 void *context,
651 struct ib_sa_query **sa_query)
652 {
653 struct ib_sa_mcmember_query *query;
654 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
655 struct ib_sa_port *port = &sa_dev->port[port_num - sa_dev->start_port];
656 struct ib_mad_agent *agent = port->agent;
657 int ret;
658
659 query = kmalloc(sizeof *query, gfp_mask);
660 if (!query)
661 return -ENOMEM;
662 query->sa_query.mad = kmalloc(sizeof *query->sa_query.mad, gfp_mask);
663 if (!query->sa_query.mad) {
664 kfree(query);
665 return -ENOMEM;
666 }
667
668 query->callback = callback;
669 query->context = context;
670
671 init_mad(query->sa_query.mad, agent);
672
673 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
674 query->sa_query.release = ib_sa_mcmember_rec_release;
675 query->sa_query.port = port;
676 query->sa_query.mad->mad_hdr.method = method;
677 query->sa_query.mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
678 query->sa_query.mad->sa_hdr.comp_mask = comp_mask;
679
680 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
681 rec, query->sa_query.mad->data);
682
683 *sa_query = &query->sa_query;
684
685 ret = send_mad(&query->sa_query, timeout_ms);
686 if (ret < 0) {
687 *sa_query = NULL;
688 kfree(query->sa_query.mad);
689 kfree(query);
690 }
691
692 return ret;
693 }
694 EXPORT_SYMBOL(ib_sa_mcmember_rec_query);
695
696 static void send_handler(struct ib_mad_agent *agent,
697 struct ib_mad_send_wc *mad_send_wc)
698 {
699 struct ib_sa_query *query;
700 unsigned long flags;
701
702 spin_lock_irqsave(&idr_lock, flags);
703 query = idr_find(&query_idr, mad_send_wc->wr_id);
704 spin_unlock_irqrestore(&idr_lock, flags);
705
706 if (!query)
707 return;
708
709 if (query->callback)
710 switch (mad_send_wc->status) {
711 case IB_WC_SUCCESS:
712 /* No callback -- already got recv */
713 break;
714 case IB_WC_RESP_TIMEOUT_ERR:
715 query->callback(query, -ETIMEDOUT, NULL);
716 break;
717 case IB_WC_WR_FLUSH_ERR:
718 query->callback(query, -EINTR, NULL);
719 break;
720 default:
721 query->callback(query, -EIO, NULL);
722 break;
723 }
724
725 dma_unmap_single(agent->device->dma_device,
726 pci_unmap_addr(query, mapping),
727 sizeof (struct ib_sa_mad),
728 DMA_TO_DEVICE);
729 kref_put(&query->sm_ah->ref, free_sm_ah);
730
731 query->release(query);
732
733 spin_lock_irqsave(&idr_lock, flags);
734 idr_remove(&query_idr, mad_send_wc->wr_id);
735 spin_unlock_irqrestore(&idr_lock, flags);
736 }
737
738 static void recv_handler(struct ib_mad_agent *mad_agent,
739 struct ib_mad_recv_wc *mad_recv_wc)
740 {
741 struct ib_sa_query *query;
742 unsigned long flags;
743
744 spin_lock_irqsave(&idr_lock, flags);
745 query = idr_find(&query_idr, mad_recv_wc->wc->wr_id);
746 spin_unlock_irqrestore(&idr_lock, flags);
747
748 if (query && query->callback) {
749 if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
750 query->callback(query,
751 mad_recv_wc->recv_buf.mad->mad_hdr.status ?
752 -EINVAL : 0,
753 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
754 else
755 query->callback(query, -EIO, NULL);
756 }
757
758 ib_free_recv_mad(mad_recv_wc);
759 }
760
761 static void ib_sa_add_one(struct ib_device *device)
762 {
763 struct ib_sa_device *sa_dev;
764 int s, e, i;
765
766 if (device->node_type == IB_NODE_SWITCH)
767 s = e = 0;
768 else {
769 s = 1;
770 e = device->phys_port_cnt;
771 }
772
773 sa_dev = kmalloc(sizeof *sa_dev +
774 (e - s + 1) * sizeof (struct ib_sa_port),
775 GFP_KERNEL);
776 if (!sa_dev)
777 return;
778
779 sa_dev->start_port = s;
780 sa_dev->end_port = e;
781
782 for (i = 0; i <= e - s; ++i) {
783 sa_dev->port[i].mr = NULL;
784 sa_dev->port[i].sm_ah = NULL;
785 sa_dev->port[i].port_num = i + s;
786 spin_lock_init(&sa_dev->port[i].ah_lock);
787
788 sa_dev->port[i].agent =
789 ib_register_mad_agent(device, i + s, IB_QPT_GSI,
790 NULL, 0, send_handler,
791 recv_handler, sa_dev);
792 if (IS_ERR(sa_dev->port[i].agent))
793 goto err;
794
795 sa_dev->port[i].mr = ib_get_dma_mr(sa_dev->port[i].agent->qp->pd,
796 IB_ACCESS_LOCAL_WRITE);
797 if (IS_ERR(sa_dev->port[i].mr)) {
798 ib_unregister_mad_agent(sa_dev->port[i].agent);
799 goto err;
800 }
801
802 INIT_WORK(&sa_dev->port[i].update_task,
803 update_sm_ah, &sa_dev->port[i]);
804 }
805
806 ib_set_client_data(device, &sa_client, sa_dev);
807
808 /*
809 * We register our event handler after everything is set up,
810 * and then update our cached info after the event handler is
811 * registered to avoid any problems if a port changes state
812 * during our initialization.
813 */
814
815 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
816 if (ib_register_event_handler(&sa_dev->event_handler))
817 goto err;
818
819 for (i = 0; i <= e - s; ++i)
820 update_sm_ah(&sa_dev->port[i]);
821
822 return;
823
824 err:
825 while (--i >= 0) {
826 ib_dereg_mr(sa_dev->port[i].mr);
827 ib_unregister_mad_agent(sa_dev->port[i].agent);
828 }
829
830 kfree(sa_dev);
831
832 return;
833 }
834
835 static void ib_sa_remove_one(struct ib_device *device)
836 {
837 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
838 int i;
839
840 if (!sa_dev)
841 return;
842
843 ib_unregister_event_handler(&sa_dev->event_handler);
844
845 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
846 ib_unregister_mad_agent(sa_dev->port[i].agent);
847 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
848 }
849
850 kfree(sa_dev);
851 }
852
853 static int __init ib_sa_init(void)
854 {
855 int ret;
856
857 spin_lock_init(&idr_lock);
858 spin_lock_init(&tid_lock);
859
860 get_random_bytes(&tid, sizeof tid);
861
862 ret = ib_register_client(&sa_client);
863 if (ret)
864 printk(KERN_ERR "Couldn't register ib_sa client\n");
865
866 return ret;
867 }
868
869 static void __exit ib_sa_cleanup(void)
870 {
871 ib_unregister_client(&sa_client);
872 }
873
874 module_init(ib_sa_init);
875 module_exit(ib_sa_cleanup);
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