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of: MSI: Simplify irqdomain lookup
[linux/fpc-iii.git] / drivers / infiniband / core / sa_query.c
bloba95a32ba596edc03728cf7790a6752c951cde951
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 <rdma/rdma_netlink.h>
49 #include <net/netlink.h>
50 #include <uapi/rdma/ib_user_sa.h>
51 #include <rdma/ib_marshall.h>
52 #include "sa.h"
53
54 MODULE_AUTHOR("Roland Dreier");
55 MODULE_DESCRIPTION("InfiniBand subnet administration query support");
56 MODULE_LICENSE("Dual BSD/GPL");
57
58 #define IB_SA_LOCAL_SVC_TIMEOUT_MIN 100
59 #define IB_SA_LOCAL_SVC_TIMEOUT_DEFAULT 2000
60 #define IB_SA_LOCAL_SVC_TIMEOUT_MAX 200000
61 static int sa_local_svc_timeout_ms = IB_SA_LOCAL_SVC_TIMEOUT_DEFAULT;
62
63 struct ib_sa_sm_ah {
64 struct ib_ah *ah;
65 struct kref ref;
66 u16 pkey_index;
67 u8 src_path_mask;
68 };
69
70 struct ib_sa_port {
71 struct ib_mad_agent *agent;
72 struct ib_sa_sm_ah *sm_ah;
73 struct work_struct update_task;
74 spinlock_t ah_lock;
75 u8 port_num;
76 };
77
78 struct ib_sa_device {
79 int start_port, end_port;
80 struct ib_event_handler event_handler;
81 struct ib_sa_port port[0];
82 };
83
84 struct ib_sa_query {
85 void (*callback)(struct ib_sa_query *, int, struct ib_sa_mad *);
86 void (*release)(struct ib_sa_query *);
87 struct ib_sa_client *client;
88 struct ib_sa_port *port;
89 struct ib_mad_send_buf *mad_buf;
90 struct ib_sa_sm_ah *sm_ah;
91 int id;
92 u32 flags;
93 struct list_head list; /* Local svc request list */
94 u32 seq; /* Local svc request sequence number */
95 unsigned long timeout; /* Local svc timeout */
96 u8 path_use; /* How will the pathrecord be used */
97 };
98
99 #define IB_SA_ENABLE_LOCAL_SERVICE 0x00000001
100 #define IB_SA_CANCEL 0x00000002
101
102 struct ib_sa_service_query {
103 void (*callback)(int, struct ib_sa_service_rec *, void *);
104 void *context;
105 struct ib_sa_query sa_query;
106 };
107
108 struct ib_sa_path_query {
109 void (*callback)(int, struct ib_sa_path_rec *, void *);
110 void *context;
111 struct ib_sa_query sa_query;
112 };
113
114 struct ib_sa_guidinfo_query {
115 void (*callback)(int, struct ib_sa_guidinfo_rec *, void *);
116 void *context;
117 struct ib_sa_query sa_query;
118 };
119
120 struct ib_sa_mcmember_query {
121 void (*callback)(int, struct ib_sa_mcmember_rec *, void *);
122 void *context;
123 struct ib_sa_query sa_query;
124 };
125
126 static LIST_HEAD(ib_nl_request_list);
127 static DEFINE_SPINLOCK(ib_nl_request_lock);
128 static atomic_t ib_nl_sa_request_seq;
129 static struct workqueue_struct *ib_nl_wq;
130 static struct delayed_work ib_nl_timed_work;
131 static const struct nla_policy ib_nl_policy[LS_NLA_TYPE_MAX] = {
132 [LS_NLA_TYPE_PATH_RECORD] = {.type = NLA_BINARY,
133 .len = sizeof(struct ib_path_rec_data)},
134 [LS_NLA_TYPE_TIMEOUT] = {.type = NLA_U32},
135 [LS_NLA_TYPE_SERVICE_ID] = {.type = NLA_U64},
136 [LS_NLA_TYPE_DGID] = {.type = NLA_BINARY,
137 .len = sizeof(struct rdma_nla_ls_gid)},
138 [LS_NLA_TYPE_SGID] = {.type = NLA_BINARY,
139 .len = sizeof(struct rdma_nla_ls_gid)},
140 [LS_NLA_TYPE_TCLASS] = {.type = NLA_U8},
141 [LS_NLA_TYPE_PKEY] = {.type = NLA_U16},
142 [LS_NLA_TYPE_QOS_CLASS] = {.type = NLA_U16},
143 };
144
145
146 static void ib_sa_add_one(struct ib_device *device);
147 static void ib_sa_remove_one(struct ib_device *device, void *client_data);
148
149 static struct ib_client sa_client = {
150 .name = "sa",
151 .add = ib_sa_add_one,
152 .remove = ib_sa_remove_one
153 };
154
155 static DEFINE_SPINLOCK(idr_lock);
156 static DEFINE_IDR(query_idr);
157
158 static DEFINE_SPINLOCK(tid_lock);
159 static u32 tid;
160
161 #define PATH_REC_FIELD(field) \
162 .struct_offset_bytes = offsetof(struct ib_sa_path_rec, field), \
163 .struct_size_bytes = sizeof ((struct ib_sa_path_rec *) 0)->field, \
164 .field_name = "sa_path_rec:" #field
165
166 static const struct ib_field path_rec_table[] = {
167 { PATH_REC_FIELD(service_id),
168 .offset_words = 0,
169 .offset_bits = 0,
170 .size_bits = 64 },
171 { PATH_REC_FIELD(dgid),
172 .offset_words = 2,
173 .offset_bits = 0,
174 .size_bits = 128 },
175 { PATH_REC_FIELD(sgid),
176 .offset_words = 6,
177 .offset_bits = 0,
178 .size_bits = 128 },
179 { PATH_REC_FIELD(dlid),
180 .offset_words = 10,
181 .offset_bits = 0,
182 .size_bits = 16 },
183 { PATH_REC_FIELD(slid),
184 .offset_words = 10,
185 .offset_bits = 16,
186 .size_bits = 16 },
187 { PATH_REC_FIELD(raw_traffic),
188 .offset_words = 11,
189 .offset_bits = 0,
190 .size_bits = 1 },
191 { RESERVED,
192 .offset_words = 11,
193 .offset_bits = 1,
194 .size_bits = 3 },
195 { PATH_REC_FIELD(flow_label),
196 .offset_words = 11,
197 .offset_bits = 4,
198 .size_bits = 20 },
199 { PATH_REC_FIELD(hop_limit),
200 .offset_words = 11,
201 .offset_bits = 24,
202 .size_bits = 8 },
203 { PATH_REC_FIELD(traffic_class),
204 .offset_words = 12,
205 .offset_bits = 0,
206 .size_bits = 8 },
207 { PATH_REC_FIELD(reversible),
208 .offset_words = 12,
209 .offset_bits = 8,
210 .size_bits = 1 },
211 { PATH_REC_FIELD(numb_path),
212 .offset_words = 12,
213 .offset_bits = 9,
214 .size_bits = 7 },
215 { PATH_REC_FIELD(pkey),
216 .offset_words = 12,
217 .offset_bits = 16,
218 .size_bits = 16 },
219 { PATH_REC_FIELD(qos_class),
220 .offset_words = 13,
221 .offset_bits = 0,
222 .size_bits = 12 },
223 { PATH_REC_FIELD(sl),
224 .offset_words = 13,
225 .offset_bits = 12,
226 .size_bits = 4 },
227 { PATH_REC_FIELD(mtu_selector),
228 .offset_words = 13,
229 .offset_bits = 16,
230 .size_bits = 2 },
231 { PATH_REC_FIELD(mtu),
232 .offset_words = 13,
233 .offset_bits = 18,
234 .size_bits = 6 },
235 { PATH_REC_FIELD(rate_selector),
236 .offset_words = 13,
237 .offset_bits = 24,
238 .size_bits = 2 },
239 { PATH_REC_FIELD(rate),
240 .offset_words = 13,
241 .offset_bits = 26,
242 .size_bits = 6 },
243 { PATH_REC_FIELD(packet_life_time_selector),
244 .offset_words = 14,
245 .offset_bits = 0,
246 .size_bits = 2 },
247 { PATH_REC_FIELD(packet_life_time),
248 .offset_words = 14,
249 .offset_bits = 2,
250 .size_bits = 6 },
251 { PATH_REC_FIELD(preference),
252 .offset_words = 14,
253 .offset_bits = 8,
254 .size_bits = 8 },
255 { RESERVED,
256 .offset_words = 14,
257 .offset_bits = 16,
258 .size_bits = 48 },
259 };
260
261 #define MCMEMBER_REC_FIELD(field) \
262 .struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field), \
263 .struct_size_bytes = sizeof ((struct ib_sa_mcmember_rec *) 0)->field, \
264 .field_name = "sa_mcmember_rec:" #field
265
266 static const struct ib_field mcmember_rec_table[] = {
267 { MCMEMBER_REC_FIELD(mgid),
268 .offset_words = 0,
269 .offset_bits = 0,
270 .size_bits = 128 },
271 { MCMEMBER_REC_FIELD(port_gid),
272 .offset_words = 4,
273 .offset_bits = 0,
274 .size_bits = 128 },
275 { MCMEMBER_REC_FIELD(qkey),
276 .offset_words = 8,
277 .offset_bits = 0,
278 .size_bits = 32 },
279 { MCMEMBER_REC_FIELD(mlid),
280 .offset_words = 9,
281 .offset_bits = 0,
282 .size_bits = 16 },
283 { MCMEMBER_REC_FIELD(mtu_selector),
284 .offset_words = 9,
285 .offset_bits = 16,
286 .size_bits = 2 },
287 { MCMEMBER_REC_FIELD(mtu),
288 .offset_words = 9,
289 .offset_bits = 18,
290 .size_bits = 6 },
291 { MCMEMBER_REC_FIELD(traffic_class),
292 .offset_words = 9,
293 .offset_bits = 24,
294 .size_bits = 8 },
295 { MCMEMBER_REC_FIELD(pkey),
296 .offset_words = 10,
297 .offset_bits = 0,
298 .size_bits = 16 },
299 { MCMEMBER_REC_FIELD(rate_selector),
300 .offset_words = 10,
301 .offset_bits = 16,
302 .size_bits = 2 },
303 { MCMEMBER_REC_FIELD(rate),
304 .offset_words = 10,
305 .offset_bits = 18,
306 .size_bits = 6 },
307 { MCMEMBER_REC_FIELD(packet_life_time_selector),
308 .offset_words = 10,
309 .offset_bits = 24,
310 .size_bits = 2 },
311 { MCMEMBER_REC_FIELD(packet_life_time),
312 .offset_words = 10,
313 .offset_bits = 26,
314 .size_bits = 6 },
315 { MCMEMBER_REC_FIELD(sl),
316 .offset_words = 11,
317 .offset_bits = 0,
318 .size_bits = 4 },
319 { MCMEMBER_REC_FIELD(flow_label),
320 .offset_words = 11,
321 .offset_bits = 4,
322 .size_bits = 20 },
323 { MCMEMBER_REC_FIELD(hop_limit),
324 .offset_words = 11,
325 .offset_bits = 24,
326 .size_bits = 8 },
327 { MCMEMBER_REC_FIELD(scope),
328 .offset_words = 12,
329 .offset_bits = 0,
330 .size_bits = 4 },
331 { MCMEMBER_REC_FIELD(join_state),
332 .offset_words = 12,
333 .offset_bits = 4,
334 .size_bits = 4 },
335 { MCMEMBER_REC_FIELD(proxy_join),
336 .offset_words = 12,
337 .offset_bits = 8,
338 .size_bits = 1 },
339 { RESERVED,
340 .offset_words = 12,
341 .offset_bits = 9,
342 .size_bits = 23 },
343 };
344
345 #define SERVICE_REC_FIELD(field) \
346 .struct_offset_bytes = offsetof(struct ib_sa_service_rec, field), \
347 .struct_size_bytes = sizeof ((struct ib_sa_service_rec *) 0)->field, \
348 .field_name = "sa_service_rec:" #field
349
350 static const struct ib_field service_rec_table[] = {
351 { SERVICE_REC_FIELD(id),
352 .offset_words = 0,
353 .offset_bits = 0,
354 .size_bits = 64 },
355 { SERVICE_REC_FIELD(gid),
356 .offset_words = 2,
357 .offset_bits = 0,
358 .size_bits = 128 },
359 { SERVICE_REC_FIELD(pkey),
360 .offset_words = 6,
361 .offset_bits = 0,
362 .size_bits = 16 },
363 { SERVICE_REC_FIELD(lease),
364 .offset_words = 7,
365 .offset_bits = 0,
366 .size_bits = 32 },
367 { SERVICE_REC_FIELD(key),
368 .offset_words = 8,
369 .offset_bits = 0,
370 .size_bits = 128 },
371 { SERVICE_REC_FIELD(name),
372 .offset_words = 12,
373 .offset_bits = 0,
374 .size_bits = 64*8 },
375 { SERVICE_REC_FIELD(data8),
376 .offset_words = 28,
377 .offset_bits = 0,
378 .size_bits = 16*8 },
379 { SERVICE_REC_FIELD(data16),
380 .offset_words = 32,
381 .offset_bits = 0,
382 .size_bits = 8*16 },
383 { SERVICE_REC_FIELD(data32),
384 .offset_words = 36,
385 .offset_bits = 0,
386 .size_bits = 4*32 },
387 { SERVICE_REC_FIELD(data64),
388 .offset_words = 40,
389 .offset_bits = 0,
390 .size_bits = 2*64 },
391 };
392
393 #define GUIDINFO_REC_FIELD(field) \
394 .struct_offset_bytes = offsetof(struct ib_sa_guidinfo_rec, field), \
395 .struct_size_bytes = sizeof((struct ib_sa_guidinfo_rec *) 0)->field, \
396 .field_name = "sa_guidinfo_rec:" #field
397
398 static const struct ib_field guidinfo_rec_table[] = {
399 { GUIDINFO_REC_FIELD(lid),
400 .offset_words = 0,
401 .offset_bits = 0,
402 .size_bits = 16 },
403 { GUIDINFO_REC_FIELD(block_num),
404 .offset_words = 0,
405 .offset_bits = 16,
406 .size_bits = 8 },
407 { GUIDINFO_REC_FIELD(res1),
408 .offset_words = 0,
409 .offset_bits = 24,
410 .size_bits = 8 },
411 { GUIDINFO_REC_FIELD(res2),
412 .offset_words = 1,
413 .offset_bits = 0,
414 .size_bits = 32 },
415 { GUIDINFO_REC_FIELD(guid_info_list),
416 .offset_words = 2,
417 .offset_bits = 0,
418 .size_bits = 512 },
419 };
420
421 static inline void ib_sa_disable_local_svc(struct ib_sa_query *query)
422 {
423 query->flags &= ~IB_SA_ENABLE_LOCAL_SERVICE;
424 }
425
426 static inline int ib_sa_query_cancelled(struct ib_sa_query *query)
427 {
428 return (query->flags & IB_SA_CANCEL);
429 }
430
431 static void ib_nl_set_path_rec_attrs(struct sk_buff *skb,
432 struct ib_sa_query *query)
433 {
434 struct ib_sa_path_rec *sa_rec = query->mad_buf->context[1];
435 struct ib_sa_mad *mad = query->mad_buf->mad;
436 ib_sa_comp_mask comp_mask = mad->sa_hdr.comp_mask;
437 u16 val16;
438 u64 val64;
439 struct rdma_ls_resolve_header *header;
440
441 query->mad_buf->context[1] = NULL;
442
443 /* Construct the family header first */
444 header = (struct rdma_ls_resolve_header *)
445 skb_put(skb, NLMSG_ALIGN(sizeof(*header)));
446 memcpy(header->device_name, query->port->agent->device->name,
447 LS_DEVICE_NAME_MAX);
448 header->port_num = query->port->port_num;
449
450 if ((comp_mask & IB_SA_PATH_REC_REVERSIBLE) &&
451 sa_rec->reversible != 0)
452 query->path_use = LS_RESOLVE_PATH_USE_GMP;
453 else
454 query->path_use = LS_RESOLVE_PATH_USE_UNIDIRECTIONAL;
455 header->path_use = query->path_use;
456
457 /* Now build the attributes */
458 if (comp_mask & IB_SA_PATH_REC_SERVICE_ID) {
459 val64 = be64_to_cpu(sa_rec->service_id);
460 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_SERVICE_ID,
461 sizeof(val64), &val64);
462 }
463 if (comp_mask & IB_SA_PATH_REC_DGID)
464 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_DGID,
465 sizeof(sa_rec->dgid), &sa_rec->dgid);
466 if (comp_mask & IB_SA_PATH_REC_SGID)
467 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_SGID,
468 sizeof(sa_rec->sgid), &sa_rec->sgid);
469 if (comp_mask & IB_SA_PATH_REC_TRAFFIC_CLASS)
470 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_TCLASS,
471 sizeof(sa_rec->traffic_class), &sa_rec->traffic_class);
472
473 if (comp_mask & IB_SA_PATH_REC_PKEY) {
474 val16 = be16_to_cpu(sa_rec->pkey);
475 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_PKEY,
476 sizeof(val16), &val16);
477 }
478 if (comp_mask & IB_SA_PATH_REC_QOS_CLASS) {
479 val16 = be16_to_cpu(sa_rec->qos_class);
480 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_QOS_CLASS,
481 sizeof(val16), &val16);
482 }
483 }
484
485 static int ib_nl_get_path_rec_attrs_len(ib_sa_comp_mask comp_mask)
486 {
487 int len = 0;
488
489 if (comp_mask & IB_SA_PATH_REC_SERVICE_ID)
490 len += nla_total_size(sizeof(u64));
491 if (comp_mask & IB_SA_PATH_REC_DGID)
492 len += nla_total_size(sizeof(struct rdma_nla_ls_gid));
493 if (comp_mask & IB_SA_PATH_REC_SGID)
494 len += nla_total_size(sizeof(struct rdma_nla_ls_gid));
495 if (comp_mask & IB_SA_PATH_REC_TRAFFIC_CLASS)
496 len += nla_total_size(sizeof(u8));
497 if (comp_mask & IB_SA_PATH_REC_PKEY)
498 len += nla_total_size(sizeof(u16));
499 if (comp_mask & IB_SA_PATH_REC_QOS_CLASS)
500 len += nla_total_size(sizeof(u16));
501
502 /*
503 * Make sure that at least some of the required comp_mask bits are
504 * set.
505 */
506 if (WARN_ON(len == 0))
507 return len;
508
509 /* Add the family header */
510 len += NLMSG_ALIGN(sizeof(struct rdma_ls_resolve_header));
511
512 return len;
513 }
514
515 static int ib_nl_send_msg(struct ib_sa_query *query, gfp_t gfp_mask)
516 {
517 struct sk_buff *skb = NULL;
518 struct nlmsghdr *nlh;
519 void *data;
520 int ret = 0;
521 struct ib_sa_mad *mad;
522 int len;
523
524 mad = query->mad_buf->mad;
525 len = ib_nl_get_path_rec_attrs_len(mad->sa_hdr.comp_mask);
526 if (len <= 0)
527 return -EMSGSIZE;
528
529 skb = nlmsg_new(len, gfp_mask);
530 if (!skb)
531 return -ENOMEM;
532
533 /* Put nlmsg header only for now */
534 data = ibnl_put_msg(skb, &nlh, query->seq, 0, RDMA_NL_LS,
535 RDMA_NL_LS_OP_RESOLVE, NLM_F_REQUEST);
536 if (!data) {
537 kfree_skb(skb);
538 return -EMSGSIZE;
539 }
540
541 /* Add attributes */
542 ib_nl_set_path_rec_attrs(skb, query);
543
544 /* Repair the nlmsg header length */
545 nlmsg_end(skb, nlh);
546
547 ret = ibnl_multicast(skb, nlh, RDMA_NL_GROUP_LS, gfp_mask);
548 if (!ret)
549 ret = len;
550 else
551 ret = 0;
552
553 return ret;
554 }
555
556 static int ib_nl_make_request(struct ib_sa_query *query, gfp_t gfp_mask)
557 {
558 unsigned long flags;
559 unsigned long delay;
560 int ret;
561
562 INIT_LIST_HEAD(&query->list);
563 query->seq = (u32)atomic_inc_return(&ib_nl_sa_request_seq);
564
565 /* Put the request on the list first.*/
566 spin_lock_irqsave(&ib_nl_request_lock, flags);
567 delay = msecs_to_jiffies(sa_local_svc_timeout_ms);
568 query->timeout = delay + jiffies;
569 list_add_tail(&query->list, &ib_nl_request_list);
570 /* Start the timeout if this is the only request */
571 if (ib_nl_request_list.next == &query->list)
572 queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay);
573 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
574
575 ret = ib_nl_send_msg(query, gfp_mask);
576 if (ret <= 0) {
577 ret = -EIO;
578 /* Remove the request */
579 spin_lock_irqsave(&ib_nl_request_lock, flags);
580 list_del(&query->list);
581 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
582 } else {
583 ret = 0;
584 }
585
586 return ret;
587 }
588
589 static int ib_nl_cancel_request(struct ib_sa_query *query)
590 {
591 unsigned long flags;
592 struct ib_sa_query *wait_query;
593 int found = 0;
594
595 spin_lock_irqsave(&ib_nl_request_lock, flags);
596 list_for_each_entry(wait_query, &ib_nl_request_list, list) {
597 /* Let the timeout to take care of the callback */
598 if (query == wait_query) {
599 query->flags |= IB_SA_CANCEL;
600 query->timeout = jiffies;
601 list_move(&query->list, &ib_nl_request_list);
602 found = 1;
603 mod_delayed_work(ib_nl_wq, &ib_nl_timed_work, 1);
604 break;
605 }
606 }
607 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
608
609 return found;
610 }
611
612 static void send_handler(struct ib_mad_agent *agent,
613 struct ib_mad_send_wc *mad_send_wc);
614
615 static void ib_nl_process_good_resolve_rsp(struct ib_sa_query *query,
616 const struct nlmsghdr *nlh)
617 {
618 struct ib_mad_send_wc mad_send_wc;
619 struct ib_sa_mad *mad = NULL;
620 const struct nlattr *head, *curr;
621 struct ib_path_rec_data *rec;
622 int len, rem;
623 u32 mask = 0;
624 int status = -EIO;
625
626 if (query->callback) {
627 head = (const struct nlattr *) nlmsg_data(nlh);
628 len = nlmsg_len(nlh);
629 switch (query->path_use) {
630 case LS_RESOLVE_PATH_USE_UNIDIRECTIONAL:
631 mask = IB_PATH_PRIMARY | IB_PATH_OUTBOUND;
632 break;
633
634 case LS_RESOLVE_PATH_USE_ALL:
635 case LS_RESOLVE_PATH_USE_GMP:
636 default:
637 mask = IB_PATH_PRIMARY | IB_PATH_GMP |
638 IB_PATH_BIDIRECTIONAL;
639 break;
640 }
641 nla_for_each_attr(curr, head, len, rem) {
642 if (curr->nla_type == LS_NLA_TYPE_PATH_RECORD) {
643 rec = nla_data(curr);
644 /*
645 * Get the first one. In the future, we may
646 * need to get up to 6 pathrecords.
647 */
648 if ((rec->flags & mask) == mask) {
649 mad = query->mad_buf->mad;
650 mad->mad_hdr.method |=
651 IB_MGMT_METHOD_RESP;
652 memcpy(mad->data, rec->path_rec,
653 sizeof(rec->path_rec));
654 status = 0;
655 break;
656 }
657 }
658 }
659 query->callback(query, status, mad);
660 }
661
662 mad_send_wc.send_buf = query->mad_buf;
663 mad_send_wc.status = IB_WC_SUCCESS;
664 send_handler(query->mad_buf->mad_agent, &mad_send_wc);
665 }
666
667 static void ib_nl_request_timeout(struct work_struct *work)
668 {
669 unsigned long flags;
670 struct ib_sa_query *query;
671 unsigned long delay;
672 struct ib_mad_send_wc mad_send_wc;
673 int ret;
674
675 spin_lock_irqsave(&ib_nl_request_lock, flags);
676 while (!list_empty(&ib_nl_request_list)) {
677 query = list_entry(ib_nl_request_list.next,
678 struct ib_sa_query, list);
679
680 if (time_after(query->timeout, jiffies)) {
681 delay = query->timeout - jiffies;
682 if ((long)delay <= 0)
683 delay = 1;
684 queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay);
685 break;
686 }
687
688 list_del(&query->list);
689 ib_sa_disable_local_svc(query);
690 /* Hold the lock to protect against query cancellation */
691 if (ib_sa_query_cancelled(query))
692 ret = -1;
693 else
694 ret = ib_post_send_mad(query->mad_buf, NULL);
695 if (ret) {
696 mad_send_wc.send_buf = query->mad_buf;
697 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
698 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
699 send_handler(query->port->agent, &mad_send_wc);
700 spin_lock_irqsave(&ib_nl_request_lock, flags);
701 }
702 }
703 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
704 }
705
706 static int ib_nl_handle_set_timeout(struct sk_buff *skb,
707 struct netlink_callback *cb)
708 {
709 const struct nlmsghdr *nlh = (struct nlmsghdr *)cb->nlh;
710 int timeout, delta, abs_delta;
711 const struct nlattr *attr;
712 unsigned long flags;
713 struct ib_sa_query *query;
714 long delay = 0;
715 struct nlattr *tb[LS_NLA_TYPE_MAX];
716 int ret;
717
718 if (!netlink_capable(skb, CAP_NET_ADMIN))
719 return -EPERM;
720
721 ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
722 nlmsg_len(nlh), ib_nl_policy);
723 attr = (const struct nlattr *)tb[LS_NLA_TYPE_TIMEOUT];
724 if (ret || !attr)
725 goto settimeout_out;
726
727 timeout = *(int *) nla_data(attr);
728 if (timeout < IB_SA_LOCAL_SVC_TIMEOUT_MIN)
729 timeout = IB_SA_LOCAL_SVC_TIMEOUT_MIN;
730 if (timeout > IB_SA_LOCAL_SVC_TIMEOUT_MAX)
731 timeout = IB_SA_LOCAL_SVC_TIMEOUT_MAX;
732
733 delta = timeout - sa_local_svc_timeout_ms;
734 if (delta < 0)
735 abs_delta = -delta;
736 else
737 abs_delta = delta;
738
739 if (delta != 0) {
740 spin_lock_irqsave(&ib_nl_request_lock, flags);
741 sa_local_svc_timeout_ms = timeout;
742 list_for_each_entry(query, &ib_nl_request_list, list) {
743 if (delta < 0 && abs_delta > query->timeout)
744 query->timeout = 0;
745 else
746 query->timeout += delta;
747
748 /* Get the new delay from the first entry */
749 if (!delay) {
750 delay = query->timeout - jiffies;
751 if (delay <= 0)
752 delay = 1;
753 }
754 }
755 if (delay)
756 mod_delayed_work(ib_nl_wq, &ib_nl_timed_work,
757 (unsigned long)delay);
758 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
759 }
760
761 settimeout_out:
762 return skb->len;
763 }
764
765 static inline int ib_nl_is_good_resolve_resp(const struct nlmsghdr *nlh)
766 {
767 struct nlattr *tb[LS_NLA_TYPE_MAX];
768 int ret;
769
770 if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR)
771 return 0;
772
773 ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
774 nlmsg_len(nlh), ib_nl_policy);
775 if (ret)
776 return 0;
777
778 return 1;
779 }
780
781 static int ib_nl_handle_resolve_resp(struct sk_buff *skb,
782 struct netlink_callback *cb)
783 {
784 const struct nlmsghdr *nlh = (struct nlmsghdr *)cb->nlh;
785 unsigned long flags;
786 struct ib_sa_query *query;
787 struct ib_mad_send_buf *send_buf;
788 struct ib_mad_send_wc mad_send_wc;
789 int found = 0;
790 int ret;
791
792 if (!netlink_capable(skb, CAP_NET_ADMIN))
793 return -EPERM;
794
795 spin_lock_irqsave(&ib_nl_request_lock, flags);
796 list_for_each_entry(query, &ib_nl_request_list, list) {
797 /*
798 * If the query is cancelled, let the timeout routine
799 * take care of it.
800 */
801 if (nlh->nlmsg_seq == query->seq) {
802 found = !ib_sa_query_cancelled(query);
803 if (found)
804 list_del(&query->list);
805 break;
806 }
807 }
808
809 if (!found) {
810 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
811 goto resp_out;
812 }
813
814 send_buf = query->mad_buf;
815
816 if (!ib_nl_is_good_resolve_resp(nlh)) {
817 /* if the result is a failure, send out the packet via IB */
818 ib_sa_disable_local_svc(query);
819 ret = ib_post_send_mad(query->mad_buf, NULL);
820 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
821 if (ret) {
822 mad_send_wc.send_buf = send_buf;
823 mad_send_wc.status = IB_WC_GENERAL_ERR;
824 send_handler(query->port->agent, &mad_send_wc);
825 }
826 } else {
827 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
828 ib_nl_process_good_resolve_rsp(query, nlh);
829 }
830
831 resp_out:
832 return skb->len;
833 }
834
835 static struct ibnl_client_cbs ib_sa_cb_table[] = {
836 [RDMA_NL_LS_OP_RESOLVE] = {
837 .dump = ib_nl_handle_resolve_resp,
838 .module = THIS_MODULE },
839 [RDMA_NL_LS_OP_SET_TIMEOUT] = {
840 .dump = ib_nl_handle_set_timeout,
841 .module = THIS_MODULE },
842 };
843
844 static void free_sm_ah(struct kref *kref)
845 {
846 struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref);
847
848 ib_destroy_ah(sm_ah->ah);
849 kfree(sm_ah);
850 }
851
852 static void update_sm_ah(struct work_struct *work)
853 {
854 struct ib_sa_port *port =
855 container_of(work, struct ib_sa_port, update_task);
856 struct ib_sa_sm_ah *new_ah;
857 struct ib_port_attr port_attr;
858 struct ib_ah_attr ah_attr;
859
860 if (ib_query_port(port->agent->device, port->port_num, &port_attr)) {
861 printk(KERN_WARNING "Couldn't query port\n");
862 return;
863 }
864
865 new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL);
866 if (!new_ah) {
867 printk(KERN_WARNING "Couldn't allocate new SM AH\n");
868 return;
869 }
870
871 kref_init(&new_ah->ref);
872 new_ah->src_path_mask = (1 << port_attr.lmc) - 1;
873
874 new_ah->pkey_index = 0;
875 if (ib_find_pkey(port->agent->device, port->port_num,
876 IB_DEFAULT_PKEY_FULL, &new_ah->pkey_index))
877 printk(KERN_ERR "Couldn't find index for default PKey\n");
878
879 memset(&ah_attr, 0, sizeof ah_attr);
880 ah_attr.dlid = port_attr.sm_lid;
881 ah_attr.sl = port_attr.sm_sl;
882 ah_attr.port_num = port->port_num;
883
884 new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr);
885 if (IS_ERR(new_ah->ah)) {
886 printk(KERN_WARNING "Couldn't create new SM AH\n");
887 kfree(new_ah);
888 return;
889 }
890
891 spin_lock_irq(&port->ah_lock);
892 if (port->sm_ah)
893 kref_put(&port->sm_ah->ref, free_sm_ah);
894 port->sm_ah = new_ah;
895 spin_unlock_irq(&port->ah_lock);
896
897 }
898
899 static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event)
900 {
901 if (event->event == IB_EVENT_PORT_ERR ||
902 event->event == IB_EVENT_PORT_ACTIVE ||
903 event->event == IB_EVENT_LID_CHANGE ||
904 event->event == IB_EVENT_PKEY_CHANGE ||
905 event->event == IB_EVENT_SM_CHANGE ||
906 event->event == IB_EVENT_CLIENT_REREGISTER) {
907 unsigned long flags;
908 struct ib_sa_device *sa_dev =
909 container_of(handler, typeof(*sa_dev), event_handler);
910 struct ib_sa_port *port =
911 &sa_dev->port[event->element.port_num - sa_dev->start_port];
912
913 if (!rdma_cap_ib_sa(handler->device, port->port_num))
914 return;
915
916 spin_lock_irqsave(&port->ah_lock, flags);
917 if (port->sm_ah)
918 kref_put(&port->sm_ah->ref, free_sm_ah);
919 port->sm_ah = NULL;
920 spin_unlock_irqrestore(&port->ah_lock, flags);
921
922 queue_work(ib_wq, &sa_dev->port[event->element.port_num -
923 sa_dev->start_port].update_task);
924 }
925 }
926
927 void ib_sa_register_client(struct ib_sa_client *client)
928 {
929 atomic_set(&client->users, 1);
930 init_completion(&client->comp);
931 }
932 EXPORT_SYMBOL(ib_sa_register_client);
933
934 void ib_sa_unregister_client(struct ib_sa_client *client)
935 {
936 ib_sa_client_put(client);
937 wait_for_completion(&client->comp);
938 }
939 EXPORT_SYMBOL(ib_sa_unregister_client);
940
941 /**
942 * ib_sa_cancel_query - try to cancel an SA query
943 * @id:ID of query to cancel
944 * @query:query pointer to cancel
945 *
946 * Try to cancel an SA query. If the id and query don't match up or
947 * the query has already completed, nothing is done. Otherwise the
948 * query is canceled and will complete with a status of -EINTR.
949 */
950 void ib_sa_cancel_query(int id, struct ib_sa_query *query)
951 {
952 unsigned long flags;
953 struct ib_mad_agent *agent;
954 struct ib_mad_send_buf *mad_buf;
955
956 spin_lock_irqsave(&idr_lock, flags);
957 if (idr_find(&query_idr, id) != query) {
958 spin_unlock_irqrestore(&idr_lock, flags);
959 return;
960 }
961 agent = query->port->agent;
962 mad_buf = query->mad_buf;
963 spin_unlock_irqrestore(&idr_lock, flags);
964
965 /*
966 * If the query is still on the netlink request list, schedule
967 * it to be cancelled by the timeout routine. Otherwise, it has been
968 * sent to the MAD layer and has to be cancelled from there.
969 */
970 if (!ib_nl_cancel_request(query))
971 ib_cancel_mad(agent, mad_buf);
972 }
973 EXPORT_SYMBOL(ib_sa_cancel_query);
974
975 static u8 get_src_path_mask(struct ib_device *device, u8 port_num)
976 {
977 struct ib_sa_device *sa_dev;
978 struct ib_sa_port *port;
979 unsigned long flags;
980 u8 src_path_mask;
981
982 sa_dev = ib_get_client_data(device, &sa_client);
983 if (!sa_dev)
984 return 0x7f;
985
986 port = &sa_dev->port[port_num - sa_dev->start_port];
987 spin_lock_irqsave(&port->ah_lock, flags);
988 src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f;
989 spin_unlock_irqrestore(&port->ah_lock, flags);
990
991 return src_path_mask;
992 }
993
994 int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
995 struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr)
996 {
997 int ret;
998 u16 gid_index;
999 int force_grh;
1000
1001 memset(ah_attr, 0, sizeof *ah_attr);
1002 ah_attr->dlid = be16_to_cpu(rec->dlid);
1003 ah_attr->sl = rec->sl;
1004 ah_attr->src_path_bits = be16_to_cpu(rec->slid) &
1005 get_src_path_mask(device, port_num);
1006 ah_attr->port_num = port_num;
1007 ah_attr->static_rate = rec->rate;
1008
1009 force_grh = rdma_cap_eth_ah(device, port_num);
1010
1011 if (rec->hop_limit > 1 || force_grh) {
1012 struct net_device *ndev = ib_get_ndev_from_path(rec);
1013
1014 ah_attr->ah_flags = IB_AH_GRH;
1015 ah_attr->grh.dgid = rec->dgid;
1016
1017 ret = ib_find_cached_gid(device, &rec->sgid, ndev, &port_num,
1018 &gid_index);
1019 if (ret) {
1020 if (ndev)
1021 dev_put(ndev);
1022 return ret;
1023 }
1024
1025 ah_attr->grh.sgid_index = gid_index;
1026 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
1027 ah_attr->grh.hop_limit = rec->hop_limit;
1028 ah_attr->grh.traffic_class = rec->traffic_class;
1029 if (ndev)
1030 dev_put(ndev);
1031 }
1032 if (force_grh) {
1033 memcpy(ah_attr->dmac, rec->dmac, ETH_ALEN);
1034 }
1035 return 0;
1036 }
1037 EXPORT_SYMBOL(ib_init_ah_from_path);
1038
1039 static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask)
1040 {
1041 unsigned long flags;
1042
1043 spin_lock_irqsave(&query->port->ah_lock, flags);
1044 if (!query->port->sm_ah) {
1045 spin_unlock_irqrestore(&query->port->ah_lock, flags);
1046 return -EAGAIN;
1047 }
1048 kref_get(&query->port->sm_ah->ref);
1049 query->sm_ah = query->port->sm_ah;
1050 spin_unlock_irqrestore(&query->port->ah_lock, flags);
1051
1052 query->mad_buf = ib_create_send_mad(query->port->agent, 1,
1053 query->sm_ah->pkey_index,
1054 0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA,
1055 gfp_mask,
1056 IB_MGMT_BASE_VERSION);
1057 if (IS_ERR(query->mad_buf)) {
1058 kref_put(&query->sm_ah->ref, free_sm_ah);
1059 return -ENOMEM;
1060 }
1061
1062 query->mad_buf->ah = query->sm_ah->ah;
1063
1064 return 0;
1065 }
1066
1067 static void free_mad(struct ib_sa_query *query)
1068 {
1069 ib_free_send_mad(query->mad_buf);
1070 kref_put(&query->sm_ah->ref, free_sm_ah);
1071 }
1072
1073 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
1074 {
1075 unsigned long flags;
1076
1077 memset(mad, 0, sizeof *mad);
1078
1079 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION;
1080 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
1081 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
1082
1083 spin_lock_irqsave(&tid_lock, flags);
1084 mad->mad_hdr.tid =
1085 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
1086 spin_unlock_irqrestore(&tid_lock, flags);
1087 }
1088
1089 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask)
1090 {
1091 bool preload = gfpflags_allow_blocking(gfp_mask);
1092 unsigned long flags;
1093 int ret, id;
1094
1095 if (preload)
1096 idr_preload(gfp_mask);
1097 spin_lock_irqsave(&idr_lock, flags);
1098
1099 id = idr_alloc(&query_idr, query, 0, 0, GFP_NOWAIT);
1100
1101 spin_unlock_irqrestore(&idr_lock, flags);
1102 if (preload)
1103 idr_preload_end();
1104 if (id < 0)
1105 return id;
1106
1107 query->mad_buf->timeout_ms = timeout_ms;
1108 query->mad_buf->context[0] = query;
1109 query->id = id;
1110
1111 if (query->flags & IB_SA_ENABLE_LOCAL_SERVICE) {
1112 if (!ibnl_chk_listeners(RDMA_NL_GROUP_LS)) {
1113 if (!ib_nl_make_request(query, gfp_mask))
1114 return id;
1115 }
1116 ib_sa_disable_local_svc(query);
1117 }
1118
1119 ret = ib_post_send_mad(query->mad_buf, NULL);
1120 if (ret) {
1121 spin_lock_irqsave(&idr_lock, flags);
1122 idr_remove(&query_idr, id);
1123 spin_unlock_irqrestore(&idr_lock, flags);
1124 }
1125
1126 /*
1127 * It's not safe to dereference query any more, because the
1128 * send may already have completed and freed the query in
1129 * another context.
1130 */
1131 return ret ? ret : id;
1132 }
1133
1134 void ib_sa_unpack_path(void *attribute, struct ib_sa_path_rec *rec)
1135 {
1136 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), attribute, rec);
1137 }
1138 EXPORT_SYMBOL(ib_sa_unpack_path);
1139
1140 void ib_sa_pack_path(struct ib_sa_path_rec *rec, void *attribute)
1141 {
1142 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, attribute);
1143 }
1144 EXPORT_SYMBOL(ib_sa_pack_path);
1145
1146 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
1147 int status,
1148 struct ib_sa_mad *mad)
1149 {
1150 struct ib_sa_path_query *query =
1151 container_of(sa_query, struct ib_sa_path_query, sa_query);
1152
1153 if (mad) {
1154 struct ib_sa_path_rec rec;
1155
1156 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
1157 mad->data, &rec);
1158 rec.net = NULL;
1159 rec.ifindex = 0;
1160 memset(rec.dmac, 0, ETH_ALEN);
1161 query->callback(status, &rec, query->context);
1162 } else
1163 query->callback(status, NULL, query->context);
1164 }
1165
1166 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
1167 {
1168 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query));
1169 }
1170
1171 /**
1172 * ib_sa_path_rec_get - Start a Path get query
1173 * @client:SA client
1174 * @device:device to send query on
1175 * @port_num: port number to send query on
1176 * @rec:Path Record to send in query
1177 * @comp_mask:component mask to send in query
1178 * @timeout_ms:time to wait for response
1179 * @gfp_mask:GFP mask to use for internal allocations
1180 * @callback:function called when query completes, times out or is
1181 * canceled
1182 * @context:opaque user context passed to callback
1183 * @sa_query:query context, used to cancel query
1184 *
1185 * Send a Path Record Get query to the SA to look up a path. The
1186 * callback function will be called when the query completes (or
1187 * fails); status is 0 for a successful response, -EINTR if the query
1188 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
1189 * occurred sending the query. The resp parameter of the callback is
1190 * only valid if status is 0.
1191 *
1192 * If the return value of ib_sa_path_rec_get() is negative, it is an
1193 * error code. Otherwise it is a query ID that can be used to cancel
1194 * the query.
1195 */
1196 int ib_sa_path_rec_get(struct ib_sa_client *client,
1197 struct ib_device *device, u8 port_num,
1198 struct ib_sa_path_rec *rec,
1199 ib_sa_comp_mask comp_mask,
1200 int timeout_ms, gfp_t gfp_mask,
1201 void (*callback)(int status,
1202 struct ib_sa_path_rec *resp,
1203 void *context),
1204 void *context,
1205 struct ib_sa_query **sa_query)
1206 {
1207 struct ib_sa_path_query *query;
1208 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1209 struct ib_sa_port *port;
1210 struct ib_mad_agent *agent;
1211 struct ib_sa_mad *mad;
1212 int ret;
1213
1214 if (!sa_dev)
1215 return -ENODEV;
1216
1217 port = &sa_dev->port[port_num - sa_dev->start_port];
1218 agent = port->agent;
1219
1220 query = kzalloc(sizeof(*query), gfp_mask);
1221 if (!query)
1222 return -ENOMEM;
1223
1224 query->sa_query.port = port;
1225 ret = alloc_mad(&query->sa_query, gfp_mask);
1226 if (ret)
1227 goto err1;
1228
1229 ib_sa_client_get(client);
1230 query->sa_query.client = client;
1231 query->callback = callback;
1232 query->context = context;
1233
1234 mad = query->sa_query.mad_buf->mad;
1235 init_mad(mad, agent);
1236
1237 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
1238 query->sa_query.release = ib_sa_path_rec_release;
1239 mad->mad_hdr.method = IB_MGMT_METHOD_GET;
1240 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC);
1241 mad->sa_hdr.comp_mask = comp_mask;
1242
1243 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data);
1244
1245 *sa_query = &query->sa_query;
1246
1247 query->sa_query.flags |= IB_SA_ENABLE_LOCAL_SERVICE;
1248 query->sa_query.mad_buf->context[1] = rec;
1249
1250 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1251 if (ret < 0)
1252 goto err2;
1253
1254 return ret;
1255
1256 err2:
1257 *sa_query = NULL;
1258 ib_sa_client_put(query->sa_query.client);
1259 free_mad(&query->sa_query);
1260
1261 err1:
1262 kfree(query);
1263 return ret;
1264 }
1265 EXPORT_SYMBOL(ib_sa_path_rec_get);
1266
1267 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query,
1268 int status,
1269 struct ib_sa_mad *mad)
1270 {
1271 struct ib_sa_service_query *query =
1272 container_of(sa_query, struct ib_sa_service_query, sa_query);
1273
1274 if (mad) {
1275 struct ib_sa_service_rec rec;
1276
1277 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table),
1278 mad->data, &rec);
1279 query->callback(status, &rec, query->context);
1280 } else
1281 query->callback(status, NULL, query->context);
1282 }
1283
1284 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query)
1285 {
1286 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query));
1287 }
1288
1289 /**
1290 * ib_sa_service_rec_query - Start Service Record operation
1291 * @client:SA client
1292 * @device:device to send request on
1293 * @port_num: port number to send request on
1294 * @method:SA method - should be get, set, or delete
1295 * @rec:Service Record to send in request
1296 * @comp_mask:component mask to send in request
1297 * @timeout_ms:time to wait for response
1298 * @gfp_mask:GFP mask to use for internal allocations
1299 * @callback:function called when request completes, times out or is
1300 * canceled
1301 * @context:opaque user context passed to callback
1302 * @sa_query:request context, used to cancel request
1303 *
1304 * Send a Service Record set/get/delete to the SA to register,
1305 * unregister or query a service record.
1306 * The callback function will be called when the request completes (or
1307 * fails); status is 0 for a successful response, -EINTR if the query
1308 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
1309 * occurred sending the query. The resp parameter of the callback is
1310 * only valid if status is 0.
1311 *
1312 * If the return value of ib_sa_service_rec_query() is negative, it is an
1313 * error code. Otherwise it is a request ID that can be used to cancel
1314 * the query.
1315 */
1316 int ib_sa_service_rec_query(struct ib_sa_client *client,
1317 struct ib_device *device, u8 port_num, u8 method,
1318 struct ib_sa_service_rec *rec,
1319 ib_sa_comp_mask comp_mask,
1320 int timeout_ms, gfp_t gfp_mask,
1321 void (*callback)(int status,
1322 struct ib_sa_service_rec *resp,
1323 void *context),
1324 void *context,
1325 struct ib_sa_query **sa_query)
1326 {
1327 struct ib_sa_service_query *query;
1328 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1329 struct ib_sa_port *port;
1330 struct ib_mad_agent *agent;
1331 struct ib_sa_mad *mad;
1332 int ret;
1333
1334 if (!sa_dev)
1335 return -ENODEV;
1336
1337 port = &sa_dev->port[port_num - sa_dev->start_port];
1338 agent = port->agent;
1339
1340 if (method != IB_MGMT_METHOD_GET &&
1341 method != IB_MGMT_METHOD_SET &&
1342 method != IB_SA_METHOD_DELETE)
1343 return -EINVAL;
1344
1345 query = kzalloc(sizeof(*query), gfp_mask);
1346 if (!query)
1347 return -ENOMEM;
1348
1349 query->sa_query.port = port;
1350 ret = alloc_mad(&query->sa_query, gfp_mask);
1351 if (ret)
1352 goto err1;
1353
1354 ib_sa_client_get(client);
1355 query->sa_query.client = client;
1356 query->callback = callback;
1357 query->context = context;
1358
1359 mad = query->sa_query.mad_buf->mad;
1360 init_mad(mad, agent);
1361
1362 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
1363 query->sa_query.release = ib_sa_service_rec_release;
1364 mad->mad_hdr.method = method;
1365 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
1366 mad->sa_hdr.comp_mask = comp_mask;
1367
1368 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table),
1369 rec, mad->data);
1370
1371 *sa_query = &query->sa_query;
1372
1373 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1374 if (ret < 0)
1375 goto err2;
1376
1377 return ret;
1378
1379 err2:
1380 *sa_query = NULL;
1381 ib_sa_client_put(query->sa_query.client);
1382 free_mad(&query->sa_query);
1383
1384 err1:
1385 kfree(query);
1386 return ret;
1387 }
1388 EXPORT_SYMBOL(ib_sa_service_rec_query);
1389
1390 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
1391 int status,
1392 struct ib_sa_mad *mad)
1393 {
1394 struct ib_sa_mcmember_query *query =
1395 container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
1396
1397 if (mad) {
1398 struct ib_sa_mcmember_rec rec;
1399
1400 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
1401 mad->data, &rec);
1402 query->callback(status, &rec, query->context);
1403 } else
1404 query->callback(status, NULL, query->context);
1405 }
1406
1407 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
1408 {
1409 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
1410 }
1411
1412 int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
1413 struct ib_device *device, u8 port_num,
1414 u8 method,
1415 struct ib_sa_mcmember_rec *rec,
1416 ib_sa_comp_mask comp_mask,
1417 int timeout_ms, gfp_t gfp_mask,
1418 void (*callback)(int status,
1419 struct ib_sa_mcmember_rec *resp,
1420 void *context),
1421 void *context,
1422 struct ib_sa_query **sa_query)
1423 {
1424 struct ib_sa_mcmember_query *query;
1425 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1426 struct ib_sa_port *port;
1427 struct ib_mad_agent *agent;
1428 struct ib_sa_mad *mad;
1429 int ret;
1430
1431 if (!sa_dev)
1432 return -ENODEV;
1433
1434 port = &sa_dev->port[port_num - sa_dev->start_port];
1435 agent = port->agent;
1436
1437 query = kzalloc(sizeof(*query), gfp_mask);
1438 if (!query)
1439 return -ENOMEM;
1440
1441 query->sa_query.port = port;
1442 ret = alloc_mad(&query->sa_query, gfp_mask);
1443 if (ret)
1444 goto err1;
1445
1446 ib_sa_client_get(client);
1447 query->sa_query.client = client;
1448 query->callback = callback;
1449 query->context = context;
1450
1451 mad = query->sa_query.mad_buf->mad;
1452 init_mad(mad, agent);
1453
1454 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
1455 query->sa_query.release = ib_sa_mcmember_rec_release;
1456 mad->mad_hdr.method = method;
1457 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
1458 mad->sa_hdr.comp_mask = comp_mask;
1459
1460 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
1461 rec, mad->data);
1462
1463 *sa_query = &query->sa_query;
1464
1465 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1466 if (ret < 0)
1467 goto err2;
1468
1469 return ret;
1470
1471 err2:
1472 *sa_query = NULL;
1473 ib_sa_client_put(query->sa_query.client);
1474 free_mad(&query->sa_query);
1475
1476 err1:
1477 kfree(query);
1478 return ret;
1479 }
1480
1481 /* Support GuidInfoRecord */
1482 static void ib_sa_guidinfo_rec_callback(struct ib_sa_query *sa_query,
1483 int status,
1484 struct ib_sa_mad *mad)
1485 {
1486 struct ib_sa_guidinfo_query *query =
1487 container_of(sa_query, struct ib_sa_guidinfo_query, sa_query);
1488
1489 if (mad) {
1490 struct ib_sa_guidinfo_rec rec;
1491
1492 ib_unpack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table),
1493 mad->data, &rec);
1494 query->callback(status, &rec, query->context);
1495 } else
1496 query->callback(status, NULL, query->context);
1497 }
1498
1499 static void ib_sa_guidinfo_rec_release(struct ib_sa_query *sa_query)
1500 {
1501 kfree(container_of(sa_query, struct ib_sa_guidinfo_query, sa_query));
1502 }
1503
1504 int ib_sa_guid_info_rec_query(struct ib_sa_client *client,
1505 struct ib_device *device, u8 port_num,
1506 struct ib_sa_guidinfo_rec *rec,
1507 ib_sa_comp_mask comp_mask, u8 method,
1508 int timeout_ms, gfp_t gfp_mask,
1509 void (*callback)(int status,
1510 struct ib_sa_guidinfo_rec *resp,
1511 void *context),
1512 void *context,
1513 struct ib_sa_query **sa_query)
1514 {
1515 struct ib_sa_guidinfo_query *query;
1516 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1517 struct ib_sa_port *port;
1518 struct ib_mad_agent *agent;
1519 struct ib_sa_mad *mad;
1520 int ret;
1521
1522 if (!sa_dev)
1523 return -ENODEV;
1524
1525 if (method != IB_MGMT_METHOD_GET &&
1526 method != IB_MGMT_METHOD_SET &&
1527 method != IB_SA_METHOD_DELETE) {
1528 return -EINVAL;
1529 }
1530
1531 port = &sa_dev->port[port_num - sa_dev->start_port];
1532 agent = port->agent;
1533
1534 query = kzalloc(sizeof(*query), gfp_mask);
1535 if (!query)
1536 return -ENOMEM;
1537
1538 query->sa_query.port = port;
1539 ret = alloc_mad(&query->sa_query, gfp_mask);
1540 if (ret)
1541 goto err1;
1542
1543 ib_sa_client_get(client);
1544 query->sa_query.client = client;
1545 query->callback = callback;
1546 query->context = context;
1547
1548 mad = query->sa_query.mad_buf->mad;
1549 init_mad(mad, agent);
1550
1551 query->sa_query.callback = callback ? ib_sa_guidinfo_rec_callback : NULL;
1552 query->sa_query.release = ib_sa_guidinfo_rec_release;
1553
1554 mad->mad_hdr.method = method;
1555 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_GUID_INFO_REC);
1556 mad->sa_hdr.comp_mask = comp_mask;
1557
1558 ib_pack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table), rec,
1559 mad->data);
1560
1561 *sa_query = &query->sa_query;
1562
1563 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1564 if (ret < 0)
1565 goto err2;
1566
1567 return ret;
1568
1569 err2:
1570 *sa_query = NULL;
1571 ib_sa_client_put(query->sa_query.client);
1572 free_mad(&query->sa_query);
1573
1574 err1:
1575 kfree(query);
1576 return ret;
1577 }
1578 EXPORT_SYMBOL(ib_sa_guid_info_rec_query);
1579
1580 static void send_handler(struct ib_mad_agent *agent,
1581 struct ib_mad_send_wc *mad_send_wc)
1582 {
1583 struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
1584 unsigned long flags;
1585
1586 if (query->callback)
1587 switch (mad_send_wc->status) {
1588 case IB_WC_SUCCESS:
1589 /* No callback -- already got recv */
1590 break;
1591 case IB_WC_RESP_TIMEOUT_ERR:
1592 query->callback(query, -ETIMEDOUT, NULL);
1593 break;
1594 case IB_WC_WR_FLUSH_ERR:
1595 query->callback(query, -EINTR, NULL);
1596 break;
1597 default:
1598 query->callback(query, -EIO, NULL);
1599 break;
1600 }
1601
1602 spin_lock_irqsave(&idr_lock, flags);
1603 idr_remove(&query_idr, query->id);
1604 spin_unlock_irqrestore(&idr_lock, flags);
1605
1606 free_mad(query);
1607 ib_sa_client_put(query->client);
1608 query->release(query);
1609 }
1610
1611 static void recv_handler(struct ib_mad_agent *mad_agent,
1612 struct ib_mad_recv_wc *mad_recv_wc)
1613 {
1614 struct ib_sa_query *query;
1615 struct ib_mad_send_buf *mad_buf;
1616
1617 mad_buf = (void *) (unsigned long) mad_recv_wc->wc->wr_id;
1618 query = mad_buf->context[0];
1619
1620 if (query->callback) {
1621 if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
1622 query->callback(query,
1623 mad_recv_wc->recv_buf.mad->mad_hdr.status ?
1624 -EINVAL : 0,
1625 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
1626 else
1627 query->callback(query, -EIO, NULL);
1628 }
1629
1630 ib_free_recv_mad(mad_recv_wc);
1631 }
1632
1633 static void ib_sa_add_one(struct ib_device *device)
1634 {
1635 struct ib_sa_device *sa_dev;
1636 int s, e, i;
1637 int count = 0;
1638
1639 s = rdma_start_port(device);
1640 e = rdma_end_port(device);
1641
1642 sa_dev = kzalloc(sizeof *sa_dev +
1643 (e - s + 1) * sizeof (struct ib_sa_port),
1644 GFP_KERNEL);
1645 if (!sa_dev)
1646 return;
1647
1648 sa_dev->start_port = s;
1649 sa_dev->end_port = e;
1650
1651 for (i = 0; i <= e - s; ++i) {
1652 spin_lock_init(&sa_dev->port[i].ah_lock);
1653 if (!rdma_cap_ib_sa(device, i + 1))
1654 continue;
1655
1656 sa_dev->port[i].sm_ah = NULL;
1657 sa_dev->port[i].port_num = i + s;
1658
1659 sa_dev->port[i].agent =
1660 ib_register_mad_agent(device, i + s, IB_QPT_GSI,
1661 NULL, 0, send_handler,
1662 recv_handler, sa_dev, 0);
1663 if (IS_ERR(sa_dev->port[i].agent))
1664 goto err;
1665
1666 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah);
1667
1668 count++;
1669 }
1670
1671 if (!count)
1672 goto free;
1673
1674 ib_set_client_data(device, &sa_client, sa_dev);
1675
1676 /*
1677 * We register our event handler after everything is set up,
1678 * and then update our cached info after the event handler is
1679 * registered to avoid any problems if a port changes state
1680 * during our initialization.
1681 */
1682
1683 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
1684 if (ib_register_event_handler(&sa_dev->event_handler))
1685 goto err;
1686
1687 for (i = 0; i <= e - s; ++i) {
1688 if (rdma_cap_ib_sa(device, i + 1))
1689 update_sm_ah(&sa_dev->port[i].update_task);
1690 }
1691
1692 return;
1693
1694 err:
1695 while (--i >= 0) {
1696 if (rdma_cap_ib_sa(device, i + 1))
1697 ib_unregister_mad_agent(sa_dev->port[i].agent);
1698 }
1699 free:
1700 kfree(sa_dev);
1701 return;
1702 }
1703
1704 static void ib_sa_remove_one(struct ib_device *device, void *client_data)
1705 {
1706 struct ib_sa_device *sa_dev = client_data;
1707 int i;
1708
1709 if (!sa_dev)
1710 return;
1711
1712 ib_unregister_event_handler(&sa_dev->event_handler);
1713
1714 flush_workqueue(ib_wq);
1715
1716 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
1717 if (rdma_cap_ib_sa(device, i + 1)) {
1718 ib_unregister_mad_agent(sa_dev->port[i].agent);
1719 if (sa_dev->port[i].sm_ah)
1720 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
1721 }
1722
1723 }
1724
1725 kfree(sa_dev);
1726 }
1727
1728 static int __init ib_sa_init(void)
1729 {
1730 int ret;
1731
1732 get_random_bytes(&tid, sizeof tid);
1733
1734 atomic_set(&ib_nl_sa_request_seq, 0);
1735
1736 ret = ib_register_client(&sa_client);
1737 if (ret) {
1738 printk(KERN_ERR "Couldn't register ib_sa client\n");
1739 goto err1;
1740 }
1741
1742 ret = mcast_init();
1743 if (ret) {
1744 printk(KERN_ERR "Couldn't initialize multicast handling\n");
1745 goto err2;
1746 }
1747
1748 ib_nl_wq = create_singlethread_workqueue("ib_nl_sa_wq");
1749 if (!ib_nl_wq) {
1750 ret = -ENOMEM;
1751 goto err3;
1752 }
1753
1754 if (ibnl_add_client(RDMA_NL_LS, RDMA_NL_LS_NUM_OPS,
1755 ib_sa_cb_table)) {
1756 pr_err("Failed to add netlink callback\n");
1757 ret = -EINVAL;
1758 goto err4;
1759 }
1760 INIT_DELAYED_WORK(&ib_nl_timed_work, ib_nl_request_timeout);
1761
1762 return 0;
1763 err4:
1764 destroy_workqueue(ib_nl_wq);
1765 err3:
1766 mcast_cleanup();
1767 err2:
1768 ib_unregister_client(&sa_client);
1769 err1:
1770 return ret;
1771 }
1772
1773 static void __exit ib_sa_cleanup(void)
1774 {
1775 ibnl_remove_client(RDMA_NL_LS);
1776 cancel_delayed_work(&ib_nl_timed_work);
1777 flush_workqueue(ib_nl_wq);
1778 destroy_workqueue(ib_nl_wq);
1779 mcast_cleanup();
1780 ib_unregister_client(&sa_client);
1781 idr_destroy(&query_idr);
1782 }
1783
1784 module_init(ib_sa_init);
1785 module_exit(ib_sa_cleanup);
Linux with added FPC-III support