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[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 <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)
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_KERNEL);
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_KERNEL);
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)
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 spin_lock_irqsave(&ib_nl_request_lock, flags);
566 ret = ib_nl_send_msg(query);
567 if (ret <= 0) {
568 ret = -EIO;
569 goto request_out;
570 } else {
571 ret = 0;
572 }
573
574 delay = msecs_to_jiffies(sa_local_svc_timeout_ms);
575 query->timeout = delay + jiffies;
576 list_add_tail(&query->list, &ib_nl_request_list);
577 /* Start the timeout if this is the only request */
578 if (ib_nl_request_list.next == &query->list)
579 queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay);
580
581 request_out:
582 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
583
584 return ret;
585 }
586
587 static int ib_nl_cancel_request(struct ib_sa_query *query)
588 {
589 unsigned long flags;
590 struct ib_sa_query *wait_query;
591 int found = 0;
592
593 spin_lock_irqsave(&ib_nl_request_lock, flags);
594 list_for_each_entry(wait_query, &ib_nl_request_list, list) {
595 /* Let the timeout to take care of the callback */
596 if (query == wait_query) {
597 query->flags |= IB_SA_CANCEL;
598 query->timeout = jiffies;
599 list_move(&query->list, &ib_nl_request_list);
600 found = 1;
601 mod_delayed_work(ib_nl_wq, &ib_nl_timed_work, 1);
602 break;
603 }
604 }
605 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
606
607 return found;
608 }
609
610 static void send_handler(struct ib_mad_agent *agent,
611 struct ib_mad_send_wc *mad_send_wc);
612
613 static void ib_nl_process_good_resolve_rsp(struct ib_sa_query *query,
614 const struct nlmsghdr *nlh)
615 {
616 struct ib_mad_send_wc mad_send_wc;
617 struct ib_sa_mad *mad = NULL;
618 const struct nlattr *head, *curr;
619 struct ib_path_rec_data *rec;
620 int len, rem;
621 u32 mask = 0;
622 int status = -EIO;
623
624 if (query->callback) {
625 head = (const struct nlattr *) nlmsg_data(nlh);
626 len = nlmsg_len(nlh);
627 switch (query->path_use) {
628 case LS_RESOLVE_PATH_USE_UNIDIRECTIONAL:
629 mask = IB_PATH_PRIMARY | IB_PATH_OUTBOUND;
630 break;
631
632 case LS_RESOLVE_PATH_USE_ALL:
633 case LS_RESOLVE_PATH_USE_GMP:
634 default:
635 mask = IB_PATH_PRIMARY | IB_PATH_GMP |
636 IB_PATH_BIDIRECTIONAL;
637 break;
638 }
639 nla_for_each_attr(curr, head, len, rem) {
640 if (curr->nla_type == LS_NLA_TYPE_PATH_RECORD) {
641 rec = nla_data(curr);
642 /*
643 * Get the first one. In the future, we may
644 * need to get up to 6 pathrecords.
645 */
646 if ((rec->flags & mask) == mask) {
647 mad = query->mad_buf->mad;
648 mad->mad_hdr.method |=
649 IB_MGMT_METHOD_RESP;
650 memcpy(mad->data, rec->path_rec,
651 sizeof(rec->path_rec));
652 status = 0;
653 break;
654 }
655 }
656 }
657 query->callback(query, status, mad);
658 }
659
660 mad_send_wc.send_buf = query->mad_buf;
661 mad_send_wc.status = IB_WC_SUCCESS;
662 send_handler(query->mad_buf->mad_agent, &mad_send_wc);
663 }
664
665 static void ib_nl_request_timeout(struct work_struct *work)
666 {
667 unsigned long flags;
668 struct ib_sa_query *query;
669 unsigned long delay;
670 struct ib_mad_send_wc mad_send_wc;
671 int ret;
672
673 spin_lock_irqsave(&ib_nl_request_lock, flags);
674 while (!list_empty(&ib_nl_request_list)) {
675 query = list_entry(ib_nl_request_list.next,
676 struct ib_sa_query, list);
677
678 if (time_after(query->timeout, jiffies)) {
679 delay = query->timeout - jiffies;
680 if ((long)delay <= 0)
681 delay = 1;
682 queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay);
683 break;
684 }
685
686 list_del(&query->list);
687 ib_sa_disable_local_svc(query);
688 /* Hold the lock to protect against query cancellation */
689 if (ib_sa_query_cancelled(query))
690 ret = -1;
691 else
692 ret = ib_post_send_mad(query->mad_buf, NULL);
693 if (ret) {
694 mad_send_wc.send_buf = query->mad_buf;
695 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
696 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
697 send_handler(query->port->agent, &mad_send_wc);
698 spin_lock_irqsave(&ib_nl_request_lock, flags);
699 }
700 }
701 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
702 }
703
704 static int ib_nl_handle_set_timeout(struct sk_buff *skb,
705 struct netlink_callback *cb)
706 {
707 const struct nlmsghdr *nlh = (struct nlmsghdr *)cb->nlh;
708 int timeout, delta, abs_delta;
709 const struct nlattr *attr;
710 unsigned long flags;
711 struct ib_sa_query *query;
712 long delay = 0;
713 struct nlattr *tb[LS_NLA_TYPE_MAX];
714 int ret;
715
716 if (!netlink_capable(skb, CAP_NET_ADMIN))
717 return -EPERM;
718
719 ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
720 nlmsg_len(nlh), ib_nl_policy);
721 attr = (const struct nlattr *)tb[LS_NLA_TYPE_TIMEOUT];
722 if (ret || !attr)
723 goto settimeout_out;
724
725 timeout = *(int *) nla_data(attr);
726 if (timeout < IB_SA_LOCAL_SVC_TIMEOUT_MIN)
727 timeout = IB_SA_LOCAL_SVC_TIMEOUT_MIN;
728 if (timeout > IB_SA_LOCAL_SVC_TIMEOUT_MAX)
729 timeout = IB_SA_LOCAL_SVC_TIMEOUT_MAX;
730
731 delta = timeout - sa_local_svc_timeout_ms;
732 if (delta < 0)
733 abs_delta = -delta;
734 else
735 abs_delta = delta;
736
737 if (delta != 0) {
738 spin_lock_irqsave(&ib_nl_request_lock, flags);
739 sa_local_svc_timeout_ms = timeout;
740 list_for_each_entry(query, &ib_nl_request_list, list) {
741 if (delta < 0 && abs_delta > query->timeout)
742 query->timeout = 0;
743 else
744 query->timeout += delta;
745
746 /* Get the new delay from the first entry */
747 if (!delay) {
748 delay = query->timeout - jiffies;
749 if (delay <= 0)
750 delay = 1;
751 }
752 }
753 if (delay)
754 mod_delayed_work(ib_nl_wq, &ib_nl_timed_work,
755 (unsigned long)delay);
756 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
757 }
758
759 settimeout_out:
760 return skb->len;
761 }
762
763 static inline int ib_nl_is_good_resolve_resp(const struct nlmsghdr *nlh)
764 {
765 struct nlattr *tb[LS_NLA_TYPE_MAX];
766 int ret;
767
768 if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR)
769 return 0;
770
771 ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
772 nlmsg_len(nlh), ib_nl_policy);
773 if (ret)
774 return 0;
775
776 return 1;
777 }
778
779 static int ib_nl_handle_resolve_resp(struct sk_buff *skb,
780 struct netlink_callback *cb)
781 {
782 const struct nlmsghdr *nlh = (struct nlmsghdr *)cb->nlh;
783 unsigned long flags;
784 struct ib_sa_query *query;
785 struct ib_mad_send_buf *send_buf;
786 struct ib_mad_send_wc mad_send_wc;
787 int found = 0;
788 int ret;
789
790 if (!netlink_capable(skb, CAP_NET_ADMIN))
791 return -EPERM;
792
793 spin_lock_irqsave(&ib_nl_request_lock, flags);
794 list_for_each_entry(query, &ib_nl_request_list, list) {
795 /*
796 * If the query is cancelled, let the timeout routine
797 * take care of it.
798 */
799 if (nlh->nlmsg_seq == query->seq) {
800 found = !ib_sa_query_cancelled(query);
801 if (found)
802 list_del(&query->list);
803 break;
804 }
805 }
806
807 if (!found) {
808 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
809 goto resp_out;
810 }
811
812 send_buf = query->mad_buf;
813
814 if (!ib_nl_is_good_resolve_resp(nlh)) {
815 /* if the result is a failure, send out the packet via IB */
816 ib_sa_disable_local_svc(query);
817 ret = ib_post_send_mad(query->mad_buf, NULL);
818 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
819 if (ret) {
820 mad_send_wc.send_buf = send_buf;
821 mad_send_wc.status = IB_WC_GENERAL_ERR;
822 send_handler(query->port->agent, &mad_send_wc);
823 }
824 } else {
825 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
826 ib_nl_process_good_resolve_rsp(query, nlh);
827 }
828
829 resp_out:
830 return skb->len;
831 }
832
833 static struct ibnl_client_cbs ib_sa_cb_table[] = {
834 [RDMA_NL_LS_OP_RESOLVE] = {
835 .dump = ib_nl_handle_resolve_resp,
836 .module = THIS_MODULE },
837 [RDMA_NL_LS_OP_SET_TIMEOUT] = {
838 .dump = ib_nl_handle_set_timeout,
839 .module = THIS_MODULE },
840 };
841
842 static void free_sm_ah(struct kref *kref)
843 {
844 struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref);
845
846 ib_destroy_ah(sm_ah->ah);
847 kfree(sm_ah);
848 }
849
850 static void update_sm_ah(struct work_struct *work)
851 {
852 struct ib_sa_port *port =
853 container_of(work, struct ib_sa_port, update_task);
854 struct ib_sa_sm_ah *new_ah;
855 struct ib_port_attr port_attr;
856 struct ib_ah_attr ah_attr;
857
858 if (ib_query_port(port->agent->device, port->port_num, &port_attr)) {
859 printk(KERN_WARNING "Couldn't query port\n");
860 return;
861 }
862
863 new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL);
864 if (!new_ah) {
865 printk(KERN_WARNING "Couldn't allocate new SM AH\n");
866 return;
867 }
868
869 kref_init(&new_ah->ref);
870 new_ah->src_path_mask = (1 << port_attr.lmc) - 1;
871
872 new_ah->pkey_index = 0;
873 if (ib_find_pkey(port->agent->device, port->port_num,
874 IB_DEFAULT_PKEY_FULL, &new_ah->pkey_index))
875 printk(KERN_ERR "Couldn't find index for default PKey\n");
876
877 memset(&ah_attr, 0, sizeof ah_attr);
878 ah_attr.dlid = port_attr.sm_lid;
879 ah_attr.sl = port_attr.sm_sl;
880 ah_attr.port_num = port->port_num;
881
882 new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr);
883 if (IS_ERR(new_ah->ah)) {
884 printk(KERN_WARNING "Couldn't create new SM AH\n");
885 kfree(new_ah);
886 return;
887 }
888
889 spin_lock_irq(&port->ah_lock);
890 if (port->sm_ah)
891 kref_put(&port->sm_ah->ref, free_sm_ah);
892 port->sm_ah = new_ah;
893 spin_unlock_irq(&port->ah_lock);
894
895 }
896
897 static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event)
898 {
899 if (event->event == IB_EVENT_PORT_ERR ||
900 event->event == IB_EVENT_PORT_ACTIVE ||
901 event->event == IB_EVENT_LID_CHANGE ||
902 event->event == IB_EVENT_PKEY_CHANGE ||
903 event->event == IB_EVENT_SM_CHANGE ||
904 event->event == IB_EVENT_CLIENT_REREGISTER) {
905 unsigned long flags;
906 struct ib_sa_device *sa_dev =
907 container_of(handler, typeof(*sa_dev), event_handler);
908 struct ib_sa_port *port =
909 &sa_dev->port[event->element.port_num - sa_dev->start_port];
910
911 if (!rdma_cap_ib_sa(handler->device, port->port_num))
912 return;
913
914 spin_lock_irqsave(&port->ah_lock, flags);
915 if (port->sm_ah)
916 kref_put(&port->sm_ah->ref, free_sm_ah);
917 port->sm_ah = NULL;
918 spin_unlock_irqrestore(&port->ah_lock, flags);
919
920 queue_work(ib_wq, &sa_dev->port[event->element.port_num -
921 sa_dev->start_port].update_task);
922 }
923 }
924
925 void ib_sa_register_client(struct ib_sa_client *client)
926 {
927 atomic_set(&client->users, 1);
928 init_completion(&client->comp);
929 }
930 EXPORT_SYMBOL(ib_sa_register_client);
931
932 void ib_sa_unregister_client(struct ib_sa_client *client)
933 {
934 ib_sa_client_put(client);
935 wait_for_completion(&client->comp);
936 }
937 EXPORT_SYMBOL(ib_sa_unregister_client);
938
939 /**
940 * ib_sa_cancel_query - try to cancel an SA query
941 * @id:ID of query to cancel
942 * @query:query pointer to cancel
943 *
944 * Try to cancel an SA query. If the id and query don't match up or
945 * the query has already completed, nothing is done. Otherwise the
946 * query is canceled and will complete with a status of -EINTR.
947 */
948 void ib_sa_cancel_query(int id, struct ib_sa_query *query)
949 {
950 unsigned long flags;
951 struct ib_mad_agent *agent;
952 struct ib_mad_send_buf *mad_buf;
953
954 spin_lock_irqsave(&idr_lock, flags);
955 if (idr_find(&query_idr, id) != query) {
956 spin_unlock_irqrestore(&idr_lock, flags);
957 return;
958 }
959 agent = query->port->agent;
960 mad_buf = query->mad_buf;
961 spin_unlock_irqrestore(&idr_lock, flags);
962
963 /*
964 * If the query is still on the netlink request list, schedule
965 * it to be cancelled by the timeout routine. Otherwise, it has been
966 * sent to the MAD layer and has to be cancelled from there.
967 */
968 if (!ib_nl_cancel_request(query))
969 ib_cancel_mad(agent, mad_buf);
970 }
971 EXPORT_SYMBOL(ib_sa_cancel_query);
972
973 static u8 get_src_path_mask(struct ib_device *device, u8 port_num)
974 {
975 struct ib_sa_device *sa_dev;
976 struct ib_sa_port *port;
977 unsigned long flags;
978 u8 src_path_mask;
979
980 sa_dev = ib_get_client_data(device, &sa_client);
981 if (!sa_dev)
982 return 0x7f;
983
984 port = &sa_dev->port[port_num - sa_dev->start_port];
985 spin_lock_irqsave(&port->ah_lock, flags);
986 src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f;
987 spin_unlock_irqrestore(&port->ah_lock, flags);
988
989 return src_path_mask;
990 }
991
992 int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
993 struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr)
994 {
995 int ret;
996 u16 gid_index;
997 int force_grh;
998
999 memset(ah_attr, 0, sizeof *ah_attr);
1000 ah_attr->dlid = be16_to_cpu(rec->dlid);
1001 ah_attr->sl = rec->sl;
1002 ah_attr->src_path_bits = be16_to_cpu(rec->slid) &
1003 get_src_path_mask(device, port_num);
1004 ah_attr->port_num = port_num;
1005 ah_attr->static_rate = rec->rate;
1006
1007 force_grh = rdma_cap_eth_ah(device, port_num);
1008
1009 if (rec->hop_limit > 1 || force_grh) {
1010 ah_attr->ah_flags = IB_AH_GRH;
1011 ah_attr->grh.dgid = rec->dgid;
1012
1013 ret = ib_find_cached_gid(device, &rec->sgid, &port_num,
1014 &gid_index);
1015 if (ret)
1016 return ret;
1017
1018 ah_attr->grh.sgid_index = gid_index;
1019 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
1020 ah_attr->grh.hop_limit = rec->hop_limit;
1021 ah_attr->grh.traffic_class = rec->traffic_class;
1022 }
1023 if (force_grh) {
1024 memcpy(ah_attr->dmac, rec->dmac, ETH_ALEN);
1025 ah_attr->vlan_id = rec->vlan_id;
1026 } else {
1027 ah_attr->vlan_id = 0xffff;
1028 }
1029
1030 return 0;
1031 }
1032 EXPORT_SYMBOL(ib_init_ah_from_path);
1033
1034 static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask)
1035 {
1036 unsigned long flags;
1037
1038 spin_lock_irqsave(&query->port->ah_lock, flags);
1039 if (!query->port->sm_ah) {
1040 spin_unlock_irqrestore(&query->port->ah_lock, flags);
1041 return -EAGAIN;
1042 }
1043 kref_get(&query->port->sm_ah->ref);
1044 query->sm_ah = query->port->sm_ah;
1045 spin_unlock_irqrestore(&query->port->ah_lock, flags);
1046
1047 query->mad_buf = ib_create_send_mad(query->port->agent, 1,
1048 query->sm_ah->pkey_index,
1049 0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA,
1050 gfp_mask,
1051 IB_MGMT_BASE_VERSION);
1052 if (IS_ERR(query->mad_buf)) {
1053 kref_put(&query->sm_ah->ref, free_sm_ah);
1054 return -ENOMEM;
1055 }
1056
1057 query->mad_buf->ah = query->sm_ah->ah;
1058
1059 return 0;
1060 }
1061
1062 static void free_mad(struct ib_sa_query *query)
1063 {
1064 ib_free_send_mad(query->mad_buf);
1065 kref_put(&query->sm_ah->ref, free_sm_ah);
1066 }
1067
1068 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
1069 {
1070 unsigned long flags;
1071
1072 memset(mad, 0, sizeof *mad);
1073
1074 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION;
1075 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
1076 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
1077
1078 spin_lock_irqsave(&tid_lock, flags);
1079 mad->mad_hdr.tid =
1080 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
1081 spin_unlock_irqrestore(&tid_lock, flags);
1082 }
1083
1084 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask)
1085 {
1086 bool preload = gfpflags_allow_blocking(gfp_mask);
1087 unsigned long flags;
1088 int ret, id;
1089
1090 if (preload)
1091 idr_preload(gfp_mask);
1092 spin_lock_irqsave(&idr_lock, flags);
1093
1094 id = idr_alloc(&query_idr, query, 0, 0, GFP_NOWAIT);
1095
1096 spin_unlock_irqrestore(&idr_lock, flags);
1097 if (preload)
1098 idr_preload_end();
1099 if (id < 0)
1100 return id;
1101
1102 query->mad_buf->timeout_ms = timeout_ms;
1103 query->mad_buf->context[0] = query;
1104 query->id = id;
1105
1106 if (query->flags & IB_SA_ENABLE_LOCAL_SERVICE) {
1107 if (!ibnl_chk_listeners(RDMA_NL_GROUP_LS)) {
1108 if (!ib_nl_make_request(query))
1109 return id;
1110 }
1111 ib_sa_disable_local_svc(query);
1112 }
1113
1114 ret = ib_post_send_mad(query->mad_buf, NULL);
1115 if (ret) {
1116 spin_lock_irqsave(&idr_lock, flags);
1117 idr_remove(&query_idr, id);
1118 spin_unlock_irqrestore(&idr_lock, flags);
1119 }
1120
1121 /*
1122 * It's not safe to dereference query any more, because the
1123 * send may already have completed and freed the query in
1124 * another context.
1125 */
1126 return ret ? ret : id;
1127 }
1128
1129 void ib_sa_unpack_path(void *attribute, struct ib_sa_path_rec *rec)
1130 {
1131 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), attribute, rec);
1132 }
1133 EXPORT_SYMBOL(ib_sa_unpack_path);
1134
1135 void ib_sa_pack_path(struct ib_sa_path_rec *rec, void *attribute)
1136 {
1137 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, attribute);
1138 }
1139 EXPORT_SYMBOL(ib_sa_pack_path);
1140
1141 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
1142 int status,
1143 struct ib_sa_mad *mad)
1144 {
1145 struct ib_sa_path_query *query =
1146 container_of(sa_query, struct ib_sa_path_query, sa_query);
1147
1148 if (mad) {
1149 struct ib_sa_path_rec rec;
1150
1151 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
1152 mad->data, &rec);
1153 rec.vlan_id = 0xffff;
1154 memset(rec.dmac, 0, ETH_ALEN);
1155 memset(rec.smac, 0, ETH_ALEN);
1156 query->callback(status, &rec, query->context);
1157 } else
1158 query->callback(status, NULL, query->context);
1159 }
1160
1161 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
1162 {
1163 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query));
1164 }
1165
1166 /**
1167 * ib_sa_path_rec_get - Start a Path get query
1168 * @client:SA client
1169 * @device:device to send query on
1170 * @port_num: port number to send query on
1171 * @rec:Path Record to send in query
1172 * @comp_mask:component mask to send in query
1173 * @timeout_ms:time to wait for response
1174 * @gfp_mask:GFP mask to use for internal allocations
1175 * @callback:function called when query completes, times out or is
1176 * canceled
1177 * @context:opaque user context passed to callback
1178 * @sa_query:query context, used to cancel query
1179 *
1180 * Send a Path Record Get query to the SA to look up a path. The
1181 * callback function will be called when the query completes (or
1182 * fails); status is 0 for a successful response, -EINTR if the query
1183 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
1184 * occurred sending the query. The resp parameter of the callback is
1185 * only valid if status is 0.
1186 *
1187 * If the return value of ib_sa_path_rec_get() is negative, it is an
1188 * error code. Otherwise it is a query ID that can be used to cancel
1189 * the query.
1190 */
1191 int ib_sa_path_rec_get(struct ib_sa_client *client,
1192 struct ib_device *device, u8 port_num,
1193 struct ib_sa_path_rec *rec,
1194 ib_sa_comp_mask comp_mask,
1195 int timeout_ms, gfp_t gfp_mask,
1196 void (*callback)(int status,
1197 struct ib_sa_path_rec *resp,
1198 void *context),
1199 void *context,
1200 struct ib_sa_query **sa_query)
1201 {
1202 struct ib_sa_path_query *query;
1203 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1204 struct ib_sa_port *port;
1205 struct ib_mad_agent *agent;
1206 struct ib_sa_mad *mad;
1207 int ret;
1208
1209 if (!sa_dev)
1210 return -ENODEV;
1211
1212 port = &sa_dev->port[port_num - sa_dev->start_port];
1213 agent = port->agent;
1214
1215 query = kzalloc(sizeof(*query), gfp_mask);
1216 if (!query)
1217 return -ENOMEM;
1218
1219 query->sa_query.port = port;
1220 ret = alloc_mad(&query->sa_query, gfp_mask);
1221 if (ret)
1222 goto err1;
1223
1224 ib_sa_client_get(client);
1225 query->sa_query.client = client;
1226 query->callback = callback;
1227 query->context = context;
1228
1229 mad = query->sa_query.mad_buf->mad;
1230 init_mad(mad, agent);
1231
1232 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
1233 query->sa_query.release = ib_sa_path_rec_release;
1234 mad->mad_hdr.method = IB_MGMT_METHOD_GET;
1235 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC);
1236 mad->sa_hdr.comp_mask = comp_mask;
1237
1238 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data);
1239
1240 *sa_query = &query->sa_query;
1241
1242 query->sa_query.flags |= IB_SA_ENABLE_LOCAL_SERVICE;
1243 query->sa_query.mad_buf->context[1] = rec;
1244
1245 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1246 if (ret < 0)
1247 goto err2;
1248
1249 return ret;
1250
1251 err2:
1252 *sa_query = NULL;
1253 ib_sa_client_put(query->sa_query.client);
1254 free_mad(&query->sa_query);
1255
1256 err1:
1257 kfree(query);
1258 return ret;
1259 }
1260 EXPORT_SYMBOL(ib_sa_path_rec_get);
1261
1262 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query,
1263 int status,
1264 struct ib_sa_mad *mad)
1265 {
1266 struct ib_sa_service_query *query =
1267 container_of(sa_query, struct ib_sa_service_query, sa_query);
1268
1269 if (mad) {
1270 struct ib_sa_service_rec rec;
1271
1272 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table),
1273 mad->data, &rec);
1274 query->callback(status, &rec, query->context);
1275 } else
1276 query->callback(status, NULL, query->context);
1277 }
1278
1279 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query)
1280 {
1281 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query));
1282 }
1283
1284 /**
1285 * ib_sa_service_rec_query - Start Service Record operation
1286 * @client:SA client
1287 * @device:device to send request on
1288 * @port_num: port number to send request on
1289 * @method:SA method - should be get, set, or delete
1290 * @rec:Service Record to send in request
1291 * @comp_mask:component mask to send in request
1292 * @timeout_ms:time to wait for response
1293 * @gfp_mask:GFP mask to use for internal allocations
1294 * @callback:function called when request completes, times out or is
1295 * canceled
1296 * @context:opaque user context passed to callback
1297 * @sa_query:request context, used to cancel request
1298 *
1299 * Send a Service Record set/get/delete to the SA to register,
1300 * unregister or query a service record.
1301 * The callback function will be called when the request completes (or
1302 * fails); status is 0 for a successful response, -EINTR if the query
1303 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
1304 * occurred sending the query. The resp parameter of the callback is
1305 * only valid if status is 0.
1306 *
1307 * If the return value of ib_sa_service_rec_query() is negative, it is an
1308 * error code. Otherwise it is a request ID that can be used to cancel
1309 * the query.
1310 */
1311 int ib_sa_service_rec_query(struct ib_sa_client *client,
1312 struct ib_device *device, u8 port_num, u8 method,
1313 struct ib_sa_service_rec *rec,
1314 ib_sa_comp_mask comp_mask,
1315 int timeout_ms, gfp_t gfp_mask,
1316 void (*callback)(int status,
1317 struct ib_sa_service_rec *resp,
1318 void *context),
1319 void *context,
1320 struct ib_sa_query **sa_query)
1321 {
1322 struct ib_sa_service_query *query;
1323 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1324 struct ib_sa_port *port;
1325 struct ib_mad_agent *agent;
1326 struct ib_sa_mad *mad;
1327 int ret;
1328
1329 if (!sa_dev)
1330 return -ENODEV;
1331
1332 port = &sa_dev->port[port_num - sa_dev->start_port];
1333 agent = port->agent;
1334
1335 if (method != IB_MGMT_METHOD_GET &&
1336 method != IB_MGMT_METHOD_SET &&
1337 method != IB_SA_METHOD_DELETE)
1338 return -EINVAL;
1339
1340 query = kzalloc(sizeof(*query), gfp_mask);
1341 if (!query)
1342 return -ENOMEM;
1343
1344 query->sa_query.port = port;
1345 ret = alloc_mad(&query->sa_query, gfp_mask);
1346 if (ret)
1347 goto err1;
1348
1349 ib_sa_client_get(client);
1350 query->sa_query.client = client;
1351 query->callback = callback;
1352 query->context = context;
1353
1354 mad = query->sa_query.mad_buf->mad;
1355 init_mad(mad, agent);
1356
1357 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
1358 query->sa_query.release = ib_sa_service_rec_release;
1359 mad->mad_hdr.method = method;
1360 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
1361 mad->sa_hdr.comp_mask = comp_mask;
1362
1363 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table),
1364 rec, mad->data);
1365
1366 *sa_query = &query->sa_query;
1367
1368 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1369 if (ret < 0)
1370 goto err2;
1371
1372 return ret;
1373
1374 err2:
1375 *sa_query = NULL;
1376 ib_sa_client_put(query->sa_query.client);
1377 free_mad(&query->sa_query);
1378
1379 err1:
1380 kfree(query);
1381 return ret;
1382 }
1383 EXPORT_SYMBOL(ib_sa_service_rec_query);
1384
1385 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
1386 int status,
1387 struct ib_sa_mad *mad)
1388 {
1389 struct ib_sa_mcmember_query *query =
1390 container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
1391
1392 if (mad) {
1393 struct ib_sa_mcmember_rec rec;
1394
1395 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
1396 mad->data, &rec);
1397 query->callback(status, &rec, query->context);
1398 } else
1399 query->callback(status, NULL, query->context);
1400 }
1401
1402 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
1403 {
1404 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
1405 }
1406
1407 int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
1408 struct ib_device *device, u8 port_num,
1409 u8 method,
1410 struct ib_sa_mcmember_rec *rec,
1411 ib_sa_comp_mask comp_mask,
1412 int timeout_ms, gfp_t gfp_mask,
1413 void (*callback)(int status,
1414 struct ib_sa_mcmember_rec *resp,
1415 void *context),
1416 void *context,
1417 struct ib_sa_query **sa_query)
1418 {
1419 struct ib_sa_mcmember_query *query;
1420 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1421 struct ib_sa_port *port;
1422 struct ib_mad_agent *agent;
1423 struct ib_sa_mad *mad;
1424 int ret;
1425
1426 if (!sa_dev)
1427 return -ENODEV;
1428
1429 port = &sa_dev->port[port_num - sa_dev->start_port];
1430 agent = port->agent;
1431
1432 query = kzalloc(sizeof(*query), gfp_mask);
1433 if (!query)
1434 return -ENOMEM;
1435
1436 query->sa_query.port = port;
1437 ret = alloc_mad(&query->sa_query, gfp_mask);
1438 if (ret)
1439 goto err1;
1440
1441 ib_sa_client_get(client);
1442 query->sa_query.client = client;
1443 query->callback = callback;
1444 query->context = context;
1445
1446 mad = query->sa_query.mad_buf->mad;
1447 init_mad(mad, agent);
1448
1449 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
1450 query->sa_query.release = ib_sa_mcmember_rec_release;
1451 mad->mad_hdr.method = method;
1452 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
1453 mad->sa_hdr.comp_mask = comp_mask;
1454
1455 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
1456 rec, mad->data);
1457
1458 *sa_query = &query->sa_query;
1459
1460 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1461 if (ret < 0)
1462 goto err2;
1463
1464 return ret;
1465
1466 err2:
1467 *sa_query = NULL;
1468 ib_sa_client_put(query->sa_query.client);
1469 free_mad(&query->sa_query);
1470
1471 err1:
1472 kfree(query);
1473 return ret;
1474 }
1475
1476 /* Support GuidInfoRecord */
1477 static void ib_sa_guidinfo_rec_callback(struct ib_sa_query *sa_query,
1478 int status,
1479 struct ib_sa_mad *mad)
1480 {
1481 struct ib_sa_guidinfo_query *query =
1482 container_of(sa_query, struct ib_sa_guidinfo_query, sa_query);
1483
1484 if (mad) {
1485 struct ib_sa_guidinfo_rec rec;
1486
1487 ib_unpack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table),
1488 mad->data, &rec);
1489 query->callback(status, &rec, query->context);
1490 } else
1491 query->callback(status, NULL, query->context);
1492 }
1493
1494 static void ib_sa_guidinfo_rec_release(struct ib_sa_query *sa_query)
1495 {
1496 kfree(container_of(sa_query, struct ib_sa_guidinfo_query, sa_query));
1497 }
1498
1499 int ib_sa_guid_info_rec_query(struct ib_sa_client *client,
1500 struct ib_device *device, u8 port_num,
1501 struct ib_sa_guidinfo_rec *rec,
1502 ib_sa_comp_mask comp_mask, u8 method,
1503 int timeout_ms, gfp_t gfp_mask,
1504 void (*callback)(int status,
1505 struct ib_sa_guidinfo_rec *resp,
1506 void *context),
1507 void *context,
1508 struct ib_sa_query **sa_query)
1509 {
1510 struct ib_sa_guidinfo_query *query;
1511 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1512 struct ib_sa_port *port;
1513 struct ib_mad_agent *agent;
1514 struct ib_sa_mad *mad;
1515 int ret;
1516
1517 if (!sa_dev)
1518 return -ENODEV;
1519
1520 if (method != IB_MGMT_METHOD_GET &&
1521 method != IB_MGMT_METHOD_SET &&
1522 method != IB_SA_METHOD_DELETE) {
1523 return -EINVAL;
1524 }
1525
1526 port = &sa_dev->port[port_num - sa_dev->start_port];
1527 agent = port->agent;
1528
1529 query = kzalloc(sizeof(*query), gfp_mask);
1530 if (!query)
1531 return -ENOMEM;
1532
1533 query->sa_query.port = port;
1534 ret = alloc_mad(&query->sa_query, gfp_mask);
1535 if (ret)
1536 goto err1;
1537
1538 ib_sa_client_get(client);
1539 query->sa_query.client = client;
1540 query->callback = callback;
1541 query->context = context;
1542
1543 mad = query->sa_query.mad_buf->mad;
1544 init_mad(mad, agent);
1545
1546 query->sa_query.callback = callback ? ib_sa_guidinfo_rec_callback : NULL;
1547 query->sa_query.release = ib_sa_guidinfo_rec_release;
1548
1549 mad->mad_hdr.method = method;
1550 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_GUID_INFO_REC);
1551 mad->sa_hdr.comp_mask = comp_mask;
1552
1553 ib_pack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table), rec,
1554 mad->data);
1555
1556 *sa_query = &query->sa_query;
1557
1558 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1559 if (ret < 0)
1560 goto err2;
1561
1562 return ret;
1563
1564 err2:
1565 *sa_query = NULL;
1566 ib_sa_client_put(query->sa_query.client);
1567 free_mad(&query->sa_query);
1568
1569 err1:
1570 kfree(query);
1571 return ret;
1572 }
1573 EXPORT_SYMBOL(ib_sa_guid_info_rec_query);
1574
1575 static void send_handler(struct ib_mad_agent *agent,
1576 struct ib_mad_send_wc *mad_send_wc)
1577 {
1578 struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
1579 unsigned long flags;
1580
1581 if (query->callback)
1582 switch (mad_send_wc->status) {
1583 case IB_WC_SUCCESS:
1584 /* No callback -- already got recv */
1585 break;
1586 case IB_WC_RESP_TIMEOUT_ERR:
1587 query->callback(query, -ETIMEDOUT, NULL);
1588 break;
1589 case IB_WC_WR_FLUSH_ERR:
1590 query->callback(query, -EINTR, NULL);
1591 break;
1592 default:
1593 query->callback(query, -EIO, NULL);
1594 break;
1595 }
1596
1597 spin_lock_irqsave(&idr_lock, flags);
1598 idr_remove(&query_idr, query->id);
1599 spin_unlock_irqrestore(&idr_lock, flags);
1600
1601 free_mad(query);
1602 ib_sa_client_put(query->client);
1603 query->release(query);
1604 }
1605
1606 static void recv_handler(struct ib_mad_agent *mad_agent,
1607 struct ib_mad_recv_wc *mad_recv_wc)
1608 {
1609 struct ib_sa_query *query;
1610 struct ib_mad_send_buf *mad_buf;
1611
1612 mad_buf = (void *) (unsigned long) mad_recv_wc->wc->wr_id;
1613 query = mad_buf->context[0];
1614
1615 if (query->callback) {
1616 if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
1617 query->callback(query,
1618 mad_recv_wc->recv_buf.mad->mad_hdr.status ?
1619 -EINVAL : 0,
1620 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
1621 else
1622 query->callback(query, -EIO, NULL);
1623 }
1624
1625 ib_free_recv_mad(mad_recv_wc);
1626 }
1627
1628 static void ib_sa_add_one(struct ib_device *device)
1629 {
1630 struct ib_sa_device *sa_dev;
1631 int s, e, i;
1632 int count = 0;
1633
1634 s = rdma_start_port(device);
1635 e = rdma_end_port(device);
1636
1637 sa_dev = kzalloc(sizeof *sa_dev +
1638 (e - s + 1) * sizeof (struct ib_sa_port),
1639 GFP_KERNEL);
1640 if (!sa_dev)
1641 return;
1642
1643 sa_dev->start_port = s;
1644 sa_dev->end_port = e;
1645
1646 for (i = 0; i <= e - s; ++i) {
1647 spin_lock_init(&sa_dev->port[i].ah_lock);
1648 if (!rdma_cap_ib_sa(device, i + 1))
1649 continue;
1650
1651 sa_dev->port[i].sm_ah = NULL;
1652 sa_dev->port[i].port_num = i + s;
1653
1654 sa_dev->port[i].agent =
1655 ib_register_mad_agent(device, i + s, IB_QPT_GSI,
1656 NULL, 0, send_handler,
1657 recv_handler, sa_dev, 0);
1658 if (IS_ERR(sa_dev->port[i].agent))
1659 goto err;
1660
1661 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah);
1662
1663 count++;
1664 }
1665
1666 if (!count)
1667 goto free;
1668
1669 ib_set_client_data(device, &sa_client, sa_dev);
1670
1671 /*
1672 * We register our event handler after everything is set up,
1673 * and then update our cached info after the event handler is
1674 * registered to avoid any problems if a port changes state
1675 * during our initialization.
1676 */
1677
1678 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
1679 if (ib_register_event_handler(&sa_dev->event_handler))
1680 goto err;
1681
1682 for (i = 0; i <= e - s; ++i) {
1683 if (rdma_cap_ib_sa(device, i + 1))
1684 update_sm_ah(&sa_dev->port[i].update_task);
1685 }
1686
1687 return;
1688
1689 err:
1690 while (--i >= 0) {
1691 if (rdma_cap_ib_sa(device, i + 1))
1692 ib_unregister_mad_agent(sa_dev->port[i].agent);
1693 }
1694 free:
1695 kfree(sa_dev);
1696 return;
1697 }
1698
1699 static void ib_sa_remove_one(struct ib_device *device, void *client_data)
1700 {
1701 struct ib_sa_device *sa_dev = client_data;
1702 int i;
1703
1704 if (!sa_dev)
1705 return;
1706
1707 ib_unregister_event_handler(&sa_dev->event_handler);
1708
1709 flush_workqueue(ib_wq);
1710
1711 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
1712 if (rdma_cap_ib_sa(device, i + 1)) {
1713 ib_unregister_mad_agent(sa_dev->port[i].agent);
1714 if (sa_dev->port[i].sm_ah)
1715 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
1716 }
1717
1718 }
1719
1720 kfree(sa_dev);
1721 }
1722
1723 static int __init ib_sa_init(void)
1724 {
1725 int ret;
1726
1727 get_random_bytes(&tid, sizeof tid);
1728
1729 atomic_set(&ib_nl_sa_request_seq, 0);
1730
1731 ret = ib_register_client(&sa_client);
1732 if (ret) {
1733 printk(KERN_ERR "Couldn't register ib_sa client\n");
1734 goto err1;
1735 }
1736
1737 ret = mcast_init();
1738 if (ret) {
1739 printk(KERN_ERR "Couldn't initialize multicast handling\n");
1740 goto err2;
1741 }
1742
1743 ib_nl_wq = create_singlethread_workqueue("ib_nl_sa_wq");
1744 if (!ib_nl_wq) {
1745 ret = -ENOMEM;
1746 goto err3;
1747 }
1748
1749 if (ibnl_add_client(RDMA_NL_LS, RDMA_NL_LS_NUM_OPS,
1750 ib_sa_cb_table)) {
1751 pr_err("Failed to add netlink callback\n");
1752 ret = -EINVAL;
1753 goto err4;
1754 }
1755 INIT_DELAYED_WORK(&ib_nl_timed_work, ib_nl_request_timeout);
1756
1757 return 0;
1758 err4:
1759 destroy_workqueue(ib_nl_wq);
1760 err3:
1761 mcast_cleanup();
1762 err2:
1763 ib_unregister_client(&sa_client);
1764 err1:
1765 return ret;
1766 }
1767
1768 static void __exit ib_sa_cleanup(void)
1769 {
1770 ibnl_remove_client(RDMA_NL_LS);
1771 cancel_delayed_work(&ib_nl_timed_work);
1772 flush_workqueue(ib_nl_wq);
1773 destroy_workqueue(ib_nl_wq);
1774 mcast_cleanup();
1775 ib_unregister_client(&sa_client);
1776 idr_destroy(&query_idr);
1777 }
1778
1779 module_init(ib_sa_init);
1780 module_exit(ib_sa_cleanup);
Linux kernel - Deliverables
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