projects / deliverable / linux.git / blob
? search:


e364a42db14d66087247e48f268f59f61c422ad7
[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 <rdma/ib_addr.h>
53 #include "sa.h"
54 #include "core_priv.h"
55
56 MODULE_AUTHOR("Roland Dreier");
57 MODULE_DESCRIPTION("InfiniBand subnet administration query support");
58 MODULE_LICENSE("Dual BSD/GPL");
59
60 #define IB_SA_LOCAL_SVC_TIMEOUT_MIN 100
61 #define IB_SA_LOCAL_SVC_TIMEOUT_DEFAULT 2000
62 #define IB_SA_LOCAL_SVC_TIMEOUT_MAX 200000
63 static int sa_local_svc_timeout_ms = IB_SA_LOCAL_SVC_TIMEOUT_DEFAULT;
64
65 struct ib_sa_sm_ah {
66 struct ib_ah *ah;
67 struct kref ref;
68 u16 pkey_index;
69 u8 src_path_mask;
70 };
71
72 struct ib_sa_port {
73 struct ib_mad_agent *agent;
74 struct ib_sa_sm_ah *sm_ah;
75 struct work_struct update_task;
76 spinlock_t ah_lock;
77 u8 port_num;
78 };
79
80 struct ib_sa_device {
81 int start_port, end_port;
82 struct ib_event_handler event_handler;
83 struct ib_sa_port port[0];
84 };
85
86 struct ib_sa_query {
87 void (*callback)(struct ib_sa_query *, int, struct ib_sa_mad *);
88 void (*release)(struct ib_sa_query *);
89 struct ib_sa_client *client;
90 struct ib_sa_port *port;
91 struct ib_mad_send_buf *mad_buf;
92 struct ib_sa_sm_ah *sm_ah;
93 int id;
94 u32 flags;
95 struct list_head list; /* Local svc request list */
96 u32 seq; /* Local svc request sequence number */
97 unsigned long timeout; /* Local svc timeout */
98 u8 path_use; /* How will the pathrecord be used */
99 };
100
101 #define IB_SA_ENABLE_LOCAL_SERVICE 0x00000001
102 #define IB_SA_CANCEL 0x00000002
103
104 struct ib_sa_service_query {
105 void (*callback)(int, struct ib_sa_service_rec *, void *);
106 void *context;
107 struct ib_sa_query sa_query;
108 };
109
110 struct ib_sa_path_query {
111 void (*callback)(int, struct ib_sa_path_rec *, void *);
112 void *context;
113 struct ib_sa_query sa_query;
114 };
115
116 struct ib_sa_guidinfo_query {
117 void (*callback)(int, struct ib_sa_guidinfo_rec *, void *);
118 void *context;
119 struct ib_sa_query sa_query;
120 };
121
122 struct ib_sa_mcmember_query {
123 void (*callback)(int, struct ib_sa_mcmember_rec *, void *);
124 void *context;
125 struct ib_sa_query sa_query;
126 };
127
128 static LIST_HEAD(ib_nl_request_list);
129 static DEFINE_SPINLOCK(ib_nl_request_lock);
130 static atomic_t ib_nl_sa_request_seq;
131 static struct workqueue_struct *ib_nl_wq;
132 static struct delayed_work ib_nl_timed_work;
133 static const struct nla_policy ib_nl_policy[LS_NLA_TYPE_MAX] = {
134 [LS_NLA_TYPE_PATH_RECORD] = {.type = NLA_BINARY,
135 .len = sizeof(struct ib_path_rec_data)},
136 [LS_NLA_TYPE_TIMEOUT] = {.type = NLA_U32},
137 [LS_NLA_TYPE_SERVICE_ID] = {.type = NLA_U64},
138 [LS_NLA_TYPE_DGID] = {.type = NLA_BINARY,
139 .len = sizeof(struct rdma_nla_ls_gid)},
140 [LS_NLA_TYPE_SGID] = {.type = NLA_BINARY,
141 .len = sizeof(struct rdma_nla_ls_gid)},
142 [LS_NLA_TYPE_TCLASS] = {.type = NLA_U8},
143 [LS_NLA_TYPE_PKEY] = {.type = NLA_U16},
144 [LS_NLA_TYPE_QOS_CLASS] = {.type = NLA_U16},
145 };
146
147
148 static void ib_sa_add_one(struct ib_device *device);
149 static void ib_sa_remove_one(struct ib_device *device, void *client_data);
150
151 static struct ib_client sa_client = {
152 .name = "sa",
153 .add = ib_sa_add_one,
154 .remove = ib_sa_remove_one
155 };
156
157 static DEFINE_SPINLOCK(idr_lock);
158 static DEFINE_IDR(query_idr);
159
160 static DEFINE_SPINLOCK(tid_lock);
161 static u32 tid;
162
163 #define PATH_REC_FIELD(field) \
164 .struct_offset_bytes = offsetof(struct ib_sa_path_rec, field), \
165 .struct_size_bytes = sizeof ((struct ib_sa_path_rec *) 0)->field, \
166 .field_name = "sa_path_rec:" #field
167
168 static const struct ib_field path_rec_table[] = {
169 { PATH_REC_FIELD(service_id),
170 .offset_words = 0,
171 .offset_bits = 0,
172 .size_bits = 64 },
173 { PATH_REC_FIELD(dgid),
174 .offset_words = 2,
175 .offset_bits = 0,
176 .size_bits = 128 },
177 { PATH_REC_FIELD(sgid),
178 .offset_words = 6,
179 .offset_bits = 0,
180 .size_bits = 128 },
181 { PATH_REC_FIELD(dlid),
182 .offset_words = 10,
183 .offset_bits = 0,
184 .size_bits = 16 },
185 { PATH_REC_FIELD(slid),
186 .offset_words = 10,
187 .offset_bits = 16,
188 .size_bits = 16 },
189 { PATH_REC_FIELD(raw_traffic),
190 .offset_words = 11,
191 .offset_bits = 0,
192 .size_bits = 1 },
193 { RESERVED,
194 .offset_words = 11,
195 .offset_bits = 1,
196 .size_bits = 3 },
197 { PATH_REC_FIELD(flow_label),
198 .offset_words = 11,
199 .offset_bits = 4,
200 .size_bits = 20 },
201 { PATH_REC_FIELD(hop_limit),
202 .offset_words = 11,
203 .offset_bits = 24,
204 .size_bits = 8 },
205 { PATH_REC_FIELD(traffic_class),
206 .offset_words = 12,
207 .offset_bits = 0,
208 .size_bits = 8 },
209 { PATH_REC_FIELD(reversible),
210 .offset_words = 12,
211 .offset_bits = 8,
212 .size_bits = 1 },
213 { PATH_REC_FIELD(numb_path),
214 .offset_words = 12,
215 .offset_bits = 9,
216 .size_bits = 7 },
217 { PATH_REC_FIELD(pkey),
218 .offset_words = 12,
219 .offset_bits = 16,
220 .size_bits = 16 },
221 { PATH_REC_FIELD(qos_class),
222 .offset_words = 13,
223 .offset_bits = 0,
224 .size_bits = 12 },
225 { PATH_REC_FIELD(sl),
226 .offset_words = 13,
227 .offset_bits = 12,
228 .size_bits = 4 },
229 { PATH_REC_FIELD(mtu_selector),
230 .offset_words = 13,
231 .offset_bits = 16,
232 .size_bits = 2 },
233 { PATH_REC_FIELD(mtu),
234 .offset_words = 13,
235 .offset_bits = 18,
236 .size_bits = 6 },
237 { PATH_REC_FIELD(rate_selector),
238 .offset_words = 13,
239 .offset_bits = 24,
240 .size_bits = 2 },
241 { PATH_REC_FIELD(rate),
242 .offset_words = 13,
243 .offset_bits = 26,
244 .size_bits = 6 },
245 { PATH_REC_FIELD(packet_life_time_selector),
246 .offset_words = 14,
247 .offset_bits = 0,
248 .size_bits = 2 },
249 { PATH_REC_FIELD(packet_life_time),
250 .offset_words = 14,
251 .offset_bits = 2,
252 .size_bits = 6 },
253 { PATH_REC_FIELD(preference),
254 .offset_words = 14,
255 .offset_bits = 8,
256 .size_bits = 8 },
257 { RESERVED,
258 .offset_words = 14,
259 .offset_bits = 16,
260 .size_bits = 48 },
261 };
262
263 #define MCMEMBER_REC_FIELD(field) \
264 .struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field), \
265 .struct_size_bytes = sizeof ((struct ib_sa_mcmember_rec *) 0)->field, \
266 .field_name = "sa_mcmember_rec:" #field
267
268 static const struct ib_field mcmember_rec_table[] = {
269 { MCMEMBER_REC_FIELD(mgid),
270 .offset_words = 0,
271 .offset_bits = 0,
272 .size_bits = 128 },
273 { MCMEMBER_REC_FIELD(port_gid),
274 .offset_words = 4,
275 .offset_bits = 0,
276 .size_bits = 128 },
277 { MCMEMBER_REC_FIELD(qkey),
278 .offset_words = 8,
279 .offset_bits = 0,
280 .size_bits = 32 },
281 { MCMEMBER_REC_FIELD(mlid),
282 .offset_words = 9,
283 .offset_bits = 0,
284 .size_bits = 16 },
285 { MCMEMBER_REC_FIELD(mtu_selector),
286 .offset_words = 9,
287 .offset_bits = 16,
288 .size_bits = 2 },
289 { MCMEMBER_REC_FIELD(mtu),
290 .offset_words = 9,
291 .offset_bits = 18,
292 .size_bits = 6 },
293 { MCMEMBER_REC_FIELD(traffic_class),
294 .offset_words = 9,
295 .offset_bits = 24,
296 .size_bits = 8 },
297 { MCMEMBER_REC_FIELD(pkey),
298 .offset_words = 10,
299 .offset_bits = 0,
300 .size_bits = 16 },
301 { MCMEMBER_REC_FIELD(rate_selector),
302 .offset_words = 10,
303 .offset_bits = 16,
304 .size_bits = 2 },
305 { MCMEMBER_REC_FIELD(rate),
306 .offset_words = 10,
307 .offset_bits = 18,
308 .size_bits = 6 },
309 { MCMEMBER_REC_FIELD(packet_life_time_selector),
310 .offset_words = 10,
311 .offset_bits = 24,
312 .size_bits = 2 },
313 { MCMEMBER_REC_FIELD(packet_life_time),
314 .offset_words = 10,
315 .offset_bits = 26,
316 .size_bits = 6 },
317 { MCMEMBER_REC_FIELD(sl),
318 .offset_words = 11,
319 .offset_bits = 0,
320 .size_bits = 4 },
321 { MCMEMBER_REC_FIELD(flow_label),
322 .offset_words = 11,
323 .offset_bits = 4,
324 .size_bits = 20 },
325 { MCMEMBER_REC_FIELD(hop_limit),
326 .offset_words = 11,
327 .offset_bits = 24,
328 .size_bits = 8 },
329 { MCMEMBER_REC_FIELD(scope),
330 .offset_words = 12,
331 .offset_bits = 0,
332 .size_bits = 4 },
333 { MCMEMBER_REC_FIELD(join_state),
334 .offset_words = 12,
335 .offset_bits = 4,
336 .size_bits = 4 },
337 { MCMEMBER_REC_FIELD(proxy_join),
338 .offset_words = 12,
339 .offset_bits = 8,
340 .size_bits = 1 },
341 { RESERVED,
342 .offset_words = 12,
343 .offset_bits = 9,
344 .size_bits = 23 },
345 };
346
347 #define SERVICE_REC_FIELD(field) \
348 .struct_offset_bytes = offsetof(struct ib_sa_service_rec, field), \
349 .struct_size_bytes = sizeof ((struct ib_sa_service_rec *) 0)->field, \
350 .field_name = "sa_service_rec:" #field
351
352 static const struct ib_field service_rec_table[] = {
353 { SERVICE_REC_FIELD(id),
354 .offset_words = 0,
355 .offset_bits = 0,
356 .size_bits = 64 },
357 { SERVICE_REC_FIELD(gid),
358 .offset_words = 2,
359 .offset_bits = 0,
360 .size_bits = 128 },
361 { SERVICE_REC_FIELD(pkey),
362 .offset_words = 6,
363 .offset_bits = 0,
364 .size_bits = 16 },
365 { SERVICE_REC_FIELD(lease),
366 .offset_words = 7,
367 .offset_bits = 0,
368 .size_bits = 32 },
369 { SERVICE_REC_FIELD(key),
370 .offset_words = 8,
371 .offset_bits = 0,
372 .size_bits = 128 },
373 { SERVICE_REC_FIELD(name),
374 .offset_words = 12,
375 .offset_bits = 0,
376 .size_bits = 64*8 },
377 { SERVICE_REC_FIELD(data8),
378 .offset_words = 28,
379 .offset_bits = 0,
380 .size_bits = 16*8 },
381 { SERVICE_REC_FIELD(data16),
382 .offset_words = 32,
383 .offset_bits = 0,
384 .size_bits = 8*16 },
385 { SERVICE_REC_FIELD(data32),
386 .offset_words = 36,
387 .offset_bits = 0,
388 .size_bits = 4*32 },
389 { SERVICE_REC_FIELD(data64),
390 .offset_words = 40,
391 .offset_bits = 0,
392 .size_bits = 2*64 },
393 };
394
395 #define GUIDINFO_REC_FIELD(field) \
396 .struct_offset_bytes = offsetof(struct ib_sa_guidinfo_rec, field), \
397 .struct_size_bytes = sizeof((struct ib_sa_guidinfo_rec *) 0)->field, \
398 .field_name = "sa_guidinfo_rec:" #field
399
400 static const struct ib_field guidinfo_rec_table[] = {
401 { GUIDINFO_REC_FIELD(lid),
402 .offset_words = 0,
403 .offset_bits = 0,
404 .size_bits = 16 },
405 { GUIDINFO_REC_FIELD(block_num),
406 .offset_words = 0,
407 .offset_bits = 16,
408 .size_bits = 8 },
409 { GUIDINFO_REC_FIELD(res1),
410 .offset_words = 0,
411 .offset_bits = 24,
412 .size_bits = 8 },
413 { GUIDINFO_REC_FIELD(res2),
414 .offset_words = 1,
415 .offset_bits = 0,
416 .size_bits = 32 },
417 { GUIDINFO_REC_FIELD(guid_info_list),
418 .offset_words = 2,
419 .offset_bits = 0,
420 .size_bits = 512 },
421 };
422
423 static inline void ib_sa_disable_local_svc(struct ib_sa_query *query)
424 {
425 query->flags &= ~IB_SA_ENABLE_LOCAL_SERVICE;
426 }
427
428 static inline int ib_sa_query_cancelled(struct ib_sa_query *query)
429 {
430 return (query->flags & IB_SA_CANCEL);
431 }
432
433 static void ib_nl_set_path_rec_attrs(struct sk_buff *skb,
434 struct ib_sa_query *query)
435 {
436 struct ib_sa_path_rec *sa_rec = query->mad_buf->context[1];
437 struct ib_sa_mad *mad = query->mad_buf->mad;
438 ib_sa_comp_mask comp_mask = mad->sa_hdr.comp_mask;
439 u16 val16;
440 u64 val64;
441 struct rdma_ls_resolve_header *header;
442
443 query->mad_buf->context[1] = NULL;
444
445 /* Construct the family header first */
446 header = (struct rdma_ls_resolve_header *)
447 skb_put(skb, NLMSG_ALIGN(sizeof(*header)));
448 memcpy(header->device_name, query->port->agent->device->name,
449 LS_DEVICE_NAME_MAX);
450 header->port_num = query->port->port_num;
451
452 if ((comp_mask & IB_SA_PATH_REC_REVERSIBLE) &&
453 sa_rec->reversible != 0)
454 query->path_use = LS_RESOLVE_PATH_USE_GMP;
455 else
456 query->path_use = LS_RESOLVE_PATH_USE_UNIDIRECTIONAL;
457 header->path_use = query->path_use;
458
459 /* Now build the attributes */
460 if (comp_mask & IB_SA_PATH_REC_SERVICE_ID) {
461 val64 = be64_to_cpu(sa_rec->service_id);
462 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_SERVICE_ID,
463 sizeof(val64), &val64);
464 }
465 if (comp_mask & IB_SA_PATH_REC_DGID)
466 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_DGID,
467 sizeof(sa_rec->dgid), &sa_rec->dgid);
468 if (comp_mask & IB_SA_PATH_REC_SGID)
469 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_SGID,
470 sizeof(sa_rec->sgid), &sa_rec->sgid);
471 if (comp_mask & IB_SA_PATH_REC_TRAFFIC_CLASS)
472 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_TCLASS,
473 sizeof(sa_rec->traffic_class), &sa_rec->traffic_class);
474
475 if (comp_mask & IB_SA_PATH_REC_PKEY) {
476 val16 = be16_to_cpu(sa_rec->pkey);
477 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_PKEY,
478 sizeof(val16), &val16);
479 }
480 if (comp_mask & IB_SA_PATH_REC_QOS_CLASS) {
481 val16 = be16_to_cpu(sa_rec->qos_class);
482 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_QOS_CLASS,
483 sizeof(val16), &val16);
484 }
485 }
486
487 static int ib_nl_get_path_rec_attrs_len(ib_sa_comp_mask comp_mask)
488 {
489 int len = 0;
490
491 if (comp_mask & IB_SA_PATH_REC_SERVICE_ID)
492 len += nla_total_size(sizeof(u64));
493 if (comp_mask & IB_SA_PATH_REC_DGID)
494 len += nla_total_size(sizeof(struct rdma_nla_ls_gid));
495 if (comp_mask & IB_SA_PATH_REC_SGID)
496 len += nla_total_size(sizeof(struct rdma_nla_ls_gid));
497 if (comp_mask & IB_SA_PATH_REC_TRAFFIC_CLASS)
498 len += nla_total_size(sizeof(u8));
499 if (comp_mask & IB_SA_PATH_REC_PKEY)
500 len += nla_total_size(sizeof(u16));
501 if (comp_mask & IB_SA_PATH_REC_QOS_CLASS)
502 len += nla_total_size(sizeof(u16));
503
504 /*
505 * Make sure that at least some of the required comp_mask bits are
506 * set.
507 */
508 if (WARN_ON(len == 0))
509 return len;
510
511 /* Add the family header */
512 len += NLMSG_ALIGN(sizeof(struct rdma_ls_resolve_header));
513
514 return len;
515 }
516
517 static int ib_nl_send_msg(struct ib_sa_query *query, gfp_t gfp_mask)
518 {
519 struct sk_buff *skb = NULL;
520 struct nlmsghdr *nlh;
521 void *data;
522 int ret = 0;
523 struct ib_sa_mad *mad;
524 int len;
525
526 mad = query->mad_buf->mad;
527 len = ib_nl_get_path_rec_attrs_len(mad->sa_hdr.comp_mask);
528 if (len <= 0)
529 return -EMSGSIZE;
530
531 skb = nlmsg_new(len, gfp_mask);
532 if (!skb)
533 return -ENOMEM;
534
535 /* Put nlmsg header only for now */
536 data = ibnl_put_msg(skb, &nlh, query->seq, 0, RDMA_NL_LS,
537 RDMA_NL_LS_OP_RESOLVE, NLM_F_REQUEST);
538 if (!data) {
539 kfree_skb(skb);
540 return -EMSGSIZE;
541 }
542
543 /* Add attributes */
544 ib_nl_set_path_rec_attrs(skb, query);
545
546 /* Repair the nlmsg header length */
547 nlmsg_end(skb, nlh);
548
549 ret = ibnl_multicast(skb, nlh, RDMA_NL_GROUP_LS, gfp_mask);
550 if (!ret)
551 ret = len;
552 else
553 ret = 0;
554
555 return ret;
556 }
557
558 static int ib_nl_make_request(struct ib_sa_query *query, gfp_t gfp_mask)
559 {
560 unsigned long flags;
561 unsigned long delay;
562 int ret;
563
564 INIT_LIST_HEAD(&query->list);
565 query->seq = (u32)atomic_inc_return(&ib_nl_sa_request_seq);
566
567 /* Put the request on the list first.*/
568 spin_lock_irqsave(&ib_nl_request_lock, flags);
569 delay = msecs_to_jiffies(sa_local_svc_timeout_ms);
570 query->timeout = delay + jiffies;
571 list_add_tail(&query->list, &ib_nl_request_list);
572 /* Start the timeout if this is the only request */
573 if (ib_nl_request_list.next == &query->list)
574 queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay);
575 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
576
577 ret = ib_nl_send_msg(query, gfp_mask);
578 if (ret <= 0) {
579 ret = -EIO;
580 /* Remove the request */
581 spin_lock_irqsave(&ib_nl_request_lock, flags);
582 list_del(&query->list);
583 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
584 } else {
585 ret = 0;
586 }
587
588 return ret;
589 }
590
591 static int ib_nl_cancel_request(struct ib_sa_query *query)
592 {
593 unsigned long flags;
594 struct ib_sa_query *wait_query;
595 int found = 0;
596
597 spin_lock_irqsave(&ib_nl_request_lock, flags);
598 list_for_each_entry(wait_query, &ib_nl_request_list, list) {
599 /* Let the timeout to take care of the callback */
600 if (query == wait_query) {
601 query->flags |= IB_SA_CANCEL;
602 query->timeout = jiffies;
603 list_move(&query->list, &ib_nl_request_list);
604 found = 1;
605 mod_delayed_work(ib_nl_wq, &ib_nl_timed_work, 1);
606 break;
607 }
608 }
609 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
610
611 return found;
612 }
613
614 static void send_handler(struct ib_mad_agent *agent,
615 struct ib_mad_send_wc *mad_send_wc);
616
617 static void ib_nl_process_good_resolve_rsp(struct ib_sa_query *query,
618 const struct nlmsghdr *nlh)
619 {
620 struct ib_mad_send_wc mad_send_wc;
621 struct ib_sa_mad *mad = NULL;
622 const struct nlattr *head, *curr;
623 struct ib_path_rec_data *rec;
624 int len, rem;
625 u32 mask = 0;
626 int status = -EIO;
627
628 if (query->callback) {
629 head = (const struct nlattr *) nlmsg_data(nlh);
630 len = nlmsg_len(nlh);
631 switch (query->path_use) {
632 case LS_RESOLVE_PATH_USE_UNIDIRECTIONAL:
633 mask = IB_PATH_PRIMARY | IB_PATH_OUTBOUND;
634 break;
635
636 case LS_RESOLVE_PATH_USE_ALL:
637 case LS_RESOLVE_PATH_USE_GMP:
638 default:
639 mask = IB_PATH_PRIMARY | IB_PATH_GMP |
640 IB_PATH_BIDIRECTIONAL;
641 break;
642 }
643 nla_for_each_attr(curr, head, len, rem) {
644 if (curr->nla_type == LS_NLA_TYPE_PATH_RECORD) {
645 rec = nla_data(curr);
646 /*
647 * Get the first one. In the future, we may
648 * need to get up to 6 pathrecords.
649 */
650 if ((rec->flags & mask) == mask) {
651 mad = query->mad_buf->mad;
652 mad->mad_hdr.method |=
653 IB_MGMT_METHOD_RESP;
654 memcpy(mad->data, rec->path_rec,
655 sizeof(rec->path_rec));
656 status = 0;
657 break;
658 }
659 }
660 }
661 query->callback(query, status, mad);
662 }
663
664 mad_send_wc.send_buf = query->mad_buf;
665 mad_send_wc.status = IB_WC_SUCCESS;
666 send_handler(query->mad_buf->mad_agent, &mad_send_wc);
667 }
668
669 static void ib_nl_request_timeout(struct work_struct *work)
670 {
671 unsigned long flags;
672 struct ib_sa_query *query;
673 unsigned long delay;
674 struct ib_mad_send_wc mad_send_wc;
675 int ret;
676
677 spin_lock_irqsave(&ib_nl_request_lock, flags);
678 while (!list_empty(&ib_nl_request_list)) {
679 query = list_entry(ib_nl_request_list.next,
680 struct ib_sa_query, list);
681
682 if (time_after(query->timeout, jiffies)) {
683 delay = query->timeout - jiffies;
684 if ((long)delay <= 0)
685 delay = 1;
686 queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay);
687 break;
688 }
689
690 list_del(&query->list);
691 ib_sa_disable_local_svc(query);
692 /* Hold the lock to protect against query cancellation */
693 if (ib_sa_query_cancelled(query))
694 ret = -1;
695 else
696 ret = ib_post_send_mad(query->mad_buf, NULL);
697 if (ret) {
698 mad_send_wc.send_buf = query->mad_buf;
699 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
700 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
701 send_handler(query->port->agent, &mad_send_wc);
702 spin_lock_irqsave(&ib_nl_request_lock, flags);
703 }
704 }
705 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
706 }
707
708 static int ib_nl_handle_set_timeout(struct sk_buff *skb,
709 struct netlink_callback *cb)
710 {
711 const struct nlmsghdr *nlh = (struct nlmsghdr *)cb->nlh;
712 int timeout, delta, abs_delta;
713 const struct nlattr *attr;
714 unsigned long flags;
715 struct ib_sa_query *query;
716 long delay = 0;
717 struct nlattr *tb[LS_NLA_TYPE_MAX];
718 int ret;
719
720 if (!netlink_capable(skb, CAP_NET_ADMIN))
721 return -EPERM;
722
723 ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
724 nlmsg_len(nlh), ib_nl_policy);
725 attr = (const struct nlattr *)tb[LS_NLA_TYPE_TIMEOUT];
726 if (ret || !attr)
727 goto settimeout_out;
728
729 timeout = *(int *) nla_data(attr);
730 if (timeout < IB_SA_LOCAL_SVC_TIMEOUT_MIN)
731 timeout = IB_SA_LOCAL_SVC_TIMEOUT_MIN;
732 if (timeout > IB_SA_LOCAL_SVC_TIMEOUT_MAX)
733 timeout = IB_SA_LOCAL_SVC_TIMEOUT_MAX;
734
735 delta = timeout - sa_local_svc_timeout_ms;
736 if (delta < 0)
737 abs_delta = -delta;
738 else
739 abs_delta = delta;
740
741 if (delta != 0) {
742 spin_lock_irqsave(&ib_nl_request_lock, flags);
743 sa_local_svc_timeout_ms = timeout;
744 list_for_each_entry(query, &ib_nl_request_list, list) {
745 if (delta < 0 && abs_delta > query->timeout)
746 query->timeout = 0;
747 else
748 query->timeout += delta;
749
750 /* Get the new delay from the first entry */
751 if (!delay) {
752 delay = query->timeout - jiffies;
753 if (delay <= 0)
754 delay = 1;
755 }
756 }
757 if (delay)
758 mod_delayed_work(ib_nl_wq, &ib_nl_timed_work,
759 (unsigned long)delay);
760 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
761 }
762
763 settimeout_out:
764 return skb->len;
765 }
766
767 static inline int ib_nl_is_good_resolve_resp(const struct nlmsghdr *nlh)
768 {
769 struct nlattr *tb[LS_NLA_TYPE_MAX];
770 int ret;
771
772 if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR)
773 return 0;
774
775 ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
776 nlmsg_len(nlh), ib_nl_policy);
777 if (ret)
778 return 0;
779
780 return 1;
781 }
782
783 static int ib_nl_handle_resolve_resp(struct sk_buff *skb,
784 struct netlink_callback *cb)
785 {
786 const struct nlmsghdr *nlh = (struct nlmsghdr *)cb->nlh;
787 unsigned long flags;
788 struct ib_sa_query *query;
789 struct ib_mad_send_buf *send_buf;
790 struct ib_mad_send_wc mad_send_wc;
791 int found = 0;
792 int ret;
793
794 if (!netlink_capable(skb, CAP_NET_ADMIN))
795 return -EPERM;
796
797 spin_lock_irqsave(&ib_nl_request_lock, flags);
798 list_for_each_entry(query, &ib_nl_request_list, list) {
799 /*
800 * If the query is cancelled, let the timeout routine
801 * take care of it.
802 */
803 if (nlh->nlmsg_seq == query->seq) {
804 found = !ib_sa_query_cancelled(query);
805 if (found)
806 list_del(&query->list);
807 break;
808 }
809 }
810
811 if (!found) {
812 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
813 goto resp_out;
814 }
815
816 send_buf = query->mad_buf;
817
818 if (!ib_nl_is_good_resolve_resp(nlh)) {
819 /* if the result is a failure, send out the packet via IB */
820 ib_sa_disable_local_svc(query);
821 ret = ib_post_send_mad(query->mad_buf, NULL);
822 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
823 if (ret) {
824 mad_send_wc.send_buf = send_buf;
825 mad_send_wc.status = IB_WC_GENERAL_ERR;
826 send_handler(query->port->agent, &mad_send_wc);
827 }
828 } else {
829 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
830 ib_nl_process_good_resolve_rsp(query, nlh);
831 }
832
833 resp_out:
834 return skb->len;
835 }
836
837 static struct ibnl_client_cbs ib_sa_cb_table[] = {
838 [RDMA_NL_LS_OP_RESOLVE] = {
839 .dump = ib_nl_handle_resolve_resp,
840 .module = THIS_MODULE },
841 [RDMA_NL_LS_OP_SET_TIMEOUT] = {
842 .dump = ib_nl_handle_set_timeout,
843 .module = THIS_MODULE },
844 };
845
846 static void free_sm_ah(struct kref *kref)
847 {
848 struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref);
849
850 ib_destroy_ah(sm_ah->ah);
851 kfree(sm_ah);
852 }
853
854 static void update_sm_ah(struct work_struct *work)
855 {
856 struct ib_sa_port *port =
857 container_of(work, struct ib_sa_port, update_task);
858 struct ib_sa_sm_ah *new_ah;
859 struct ib_port_attr port_attr;
860 struct ib_ah_attr ah_attr;
861
862 if (ib_query_port(port->agent->device, port->port_num, &port_attr)) {
863 printk(KERN_WARNING "Couldn't query port\n");
864 return;
865 }
866
867 new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL);
868 if (!new_ah) {
869 printk(KERN_WARNING "Couldn't allocate new SM AH\n");
870 return;
871 }
872
873 kref_init(&new_ah->ref);
874 new_ah->src_path_mask = (1 << port_attr.lmc) - 1;
875
876 new_ah->pkey_index = 0;
877 if (ib_find_pkey(port->agent->device, port->port_num,
878 IB_DEFAULT_PKEY_FULL, &new_ah->pkey_index))
879 printk(KERN_ERR "Couldn't find index for default PKey\n");
880
881 memset(&ah_attr, 0, sizeof ah_attr);
882 ah_attr.dlid = port_attr.sm_lid;
883 ah_attr.sl = port_attr.sm_sl;
884 ah_attr.port_num = port->port_num;
885
886 new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr);
887 if (IS_ERR(new_ah->ah)) {
888 printk(KERN_WARNING "Couldn't create new SM AH\n");
889 kfree(new_ah);
890 return;
891 }
892
893 spin_lock_irq(&port->ah_lock);
894 if (port->sm_ah)
895 kref_put(&port->sm_ah->ref, free_sm_ah);
896 port->sm_ah = new_ah;
897 spin_unlock_irq(&port->ah_lock);
898
899 }
900
901 static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event)
902 {
903 if (event->event == IB_EVENT_PORT_ERR ||
904 event->event == IB_EVENT_PORT_ACTIVE ||
905 event->event == IB_EVENT_LID_CHANGE ||
906 event->event == IB_EVENT_PKEY_CHANGE ||
907 event->event == IB_EVENT_SM_CHANGE ||
908 event->event == IB_EVENT_CLIENT_REREGISTER) {
909 unsigned long flags;
910 struct ib_sa_device *sa_dev =
911 container_of(handler, typeof(*sa_dev), event_handler);
912 struct ib_sa_port *port =
913 &sa_dev->port[event->element.port_num - sa_dev->start_port];
914
915 if (!rdma_cap_ib_sa(handler->device, port->port_num))
916 return;
917
918 spin_lock_irqsave(&port->ah_lock, flags);
919 if (port->sm_ah)
920 kref_put(&port->sm_ah->ref, free_sm_ah);
921 port->sm_ah = NULL;
922 spin_unlock_irqrestore(&port->ah_lock, flags);
923
924 queue_work(ib_wq, &sa_dev->port[event->element.port_num -
925 sa_dev->start_port].update_task);
926 }
927 }
928
929 void ib_sa_register_client(struct ib_sa_client *client)
930 {
931 atomic_set(&client->users, 1);
932 init_completion(&client->comp);
933 }
934 EXPORT_SYMBOL(ib_sa_register_client);
935
936 void ib_sa_unregister_client(struct ib_sa_client *client)
937 {
938 ib_sa_client_put(client);
939 wait_for_completion(&client->comp);
940 }
941 EXPORT_SYMBOL(ib_sa_unregister_client);
942
943 /**
944 * ib_sa_cancel_query - try to cancel an SA query
945 * @id:ID of query to cancel
946 * @query:query pointer to cancel
947 *
948 * Try to cancel an SA query. If the id and query don't match up or
949 * the query has already completed, nothing is done. Otherwise the
950 * query is canceled and will complete with a status of -EINTR.
951 */
952 void ib_sa_cancel_query(int id, struct ib_sa_query *query)
953 {
954 unsigned long flags;
955 struct ib_mad_agent *agent;
956 struct ib_mad_send_buf *mad_buf;
957
958 spin_lock_irqsave(&idr_lock, flags);
959 if (idr_find(&query_idr, id) != query) {
960 spin_unlock_irqrestore(&idr_lock, flags);
961 return;
962 }
963 agent = query->port->agent;
964 mad_buf = query->mad_buf;
965 spin_unlock_irqrestore(&idr_lock, flags);
966
967 /*
968 * If the query is still on the netlink request list, schedule
969 * it to be cancelled by the timeout routine. Otherwise, it has been
970 * sent to the MAD layer and has to be cancelled from there.
971 */
972 if (!ib_nl_cancel_request(query))
973 ib_cancel_mad(agent, mad_buf);
974 }
975 EXPORT_SYMBOL(ib_sa_cancel_query);
976
977 static u8 get_src_path_mask(struct ib_device *device, u8 port_num)
978 {
979 struct ib_sa_device *sa_dev;
980 struct ib_sa_port *port;
981 unsigned long flags;
982 u8 src_path_mask;
983
984 sa_dev = ib_get_client_data(device, &sa_client);
985 if (!sa_dev)
986 return 0x7f;
987
988 port = &sa_dev->port[port_num - sa_dev->start_port];
989 spin_lock_irqsave(&port->ah_lock, flags);
990 src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f;
991 spin_unlock_irqrestore(&port->ah_lock, flags);
992
993 return src_path_mask;
994 }
995
996 int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
997 struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr)
998 {
999 int ret;
1000 u16 gid_index;
1001 int use_roce;
1002 struct net_device *ndev = NULL;
1003
1004 memset(ah_attr, 0, sizeof *ah_attr);
1005 ah_attr->dlid = be16_to_cpu(rec->dlid);
1006 ah_attr->sl = rec->sl;
1007 ah_attr->src_path_bits = be16_to_cpu(rec->slid) &
1008 get_src_path_mask(device, port_num);
1009 ah_attr->port_num = port_num;
1010 ah_attr->static_rate = rec->rate;
1011
1012 use_roce = rdma_cap_eth_ah(device, port_num);
1013
1014 if (use_roce) {
1015 struct net_device *idev;
1016 struct net_device *resolved_dev;
1017 struct rdma_dev_addr dev_addr = {.bound_dev_if = rec->ifindex,
1018 .net = rec->net ? rec->net :
1019 &init_net};
1020 union {
1021 struct sockaddr _sockaddr;
1022 struct sockaddr_in _sockaddr_in;
1023 struct sockaddr_in6 _sockaddr_in6;
1024 } sgid_addr, dgid_addr;
1025
1026 if (!device->get_netdev)
1027 return -EOPNOTSUPP;
1028
1029 rdma_gid2ip(&sgid_addr._sockaddr, &rec->sgid);
1030 rdma_gid2ip(&dgid_addr._sockaddr, &rec->dgid);
1031
1032 /* validate the route */
1033 ret = rdma_resolve_ip_route(&sgid_addr._sockaddr,
1034 &dgid_addr._sockaddr, &dev_addr);
1035 if (ret)
1036 return ret;
1037
1038 if ((dev_addr.network == RDMA_NETWORK_IPV4 ||
1039 dev_addr.network == RDMA_NETWORK_IPV6) &&
1040 rec->gid_type != IB_GID_TYPE_ROCE_UDP_ENCAP)
1041 return -EINVAL;
1042
1043 idev = device->get_netdev(device, port_num);
1044 if (!idev)
1045 return -ENODEV;
1046
1047 resolved_dev = dev_get_by_index(dev_addr.net,
1048 dev_addr.bound_dev_if);
1049 if (resolved_dev->flags & IFF_LOOPBACK) {
1050 dev_put(resolved_dev);
1051 resolved_dev = idev;
1052 dev_hold(resolved_dev);
1053 }
1054 ndev = ib_get_ndev_from_path(rec);
1055 rcu_read_lock();
1056 if ((ndev && ndev != resolved_dev) ||
1057 (resolved_dev != idev &&
1058 !rdma_is_upper_dev_rcu(idev, resolved_dev)))
1059 ret = -EHOSTUNREACH;
1060 rcu_read_unlock();
1061 dev_put(idev);
1062 dev_put(resolved_dev);
1063 if (ret) {
1064 if (ndev)
1065 dev_put(ndev);
1066 return ret;
1067 }
1068 }
1069
1070 if (rec->hop_limit > 1 || use_roce) {
1071 ah_attr->ah_flags = IB_AH_GRH;
1072 ah_attr->grh.dgid = rec->dgid;
1073
1074 ret = ib_find_cached_gid_by_port(device, &rec->sgid,
1075 rec->gid_type, port_num, ndev,
1076 &gid_index);
1077 if (ret) {
1078 if (ndev)
1079 dev_put(ndev);
1080 return ret;
1081 }
1082
1083 ah_attr->grh.sgid_index = gid_index;
1084 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
1085 ah_attr->grh.hop_limit = rec->hop_limit;
1086 ah_attr->grh.traffic_class = rec->traffic_class;
1087 if (ndev)
1088 dev_put(ndev);
1089 }
1090
1091 if (use_roce)
1092 memcpy(ah_attr->dmac, rec->dmac, ETH_ALEN);
1093
1094 return 0;
1095 }
1096 EXPORT_SYMBOL(ib_init_ah_from_path);
1097
1098 static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask)
1099 {
1100 unsigned long flags;
1101
1102 spin_lock_irqsave(&query->port->ah_lock, flags);
1103 if (!query->port->sm_ah) {
1104 spin_unlock_irqrestore(&query->port->ah_lock, flags);
1105 return -EAGAIN;
1106 }
1107 kref_get(&query->port->sm_ah->ref);
1108 query->sm_ah = query->port->sm_ah;
1109 spin_unlock_irqrestore(&query->port->ah_lock, flags);
1110
1111 query->mad_buf = ib_create_send_mad(query->port->agent, 1,
1112 query->sm_ah->pkey_index,
1113 0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA,
1114 gfp_mask,
1115 IB_MGMT_BASE_VERSION);
1116 if (IS_ERR(query->mad_buf)) {
1117 kref_put(&query->sm_ah->ref, free_sm_ah);
1118 return -ENOMEM;
1119 }
1120
1121 query->mad_buf->ah = query->sm_ah->ah;
1122
1123 return 0;
1124 }
1125
1126 static void free_mad(struct ib_sa_query *query)
1127 {
1128 ib_free_send_mad(query->mad_buf);
1129 kref_put(&query->sm_ah->ref, free_sm_ah);
1130 }
1131
1132 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
1133 {
1134 unsigned long flags;
1135
1136 memset(mad, 0, sizeof *mad);
1137
1138 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION;
1139 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
1140 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
1141
1142 spin_lock_irqsave(&tid_lock, flags);
1143 mad->mad_hdr.tid =
1144 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
1145 spin_unlock_irqrestore(&tid_lock, flags);
1146 }
1147
1148 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask)
1149 {
1150 bool preload = gfpflags_allow_blocking(gfp_mask);
1151 unsigned long flags;
1152 int ret, id;
1153
1154 if (preload)
1155 idr_preload(gfp_mask);
1156 spin_lock_irqsave(&idr_lock, flags);
1157
1158 id = idr_alloc(&query_idr, query, 0, 0, GFP_NOWAIT);
1159
1160 spin_unlock_irqrestore(&idr_lock, flags);
1161 if (preload)
1162 idr_preload_end();
1163 if (id < 0)
1164 return id;
1165
1166 query->mad_buf->timeout_ms = timeout_ms;
1167 query->mad_buf->context[0] = query;
1168 query->id = id;
1169
1170 if (query->flags & IB_SA_ENABLE_LOCAL_SERVICE) {
1171 if (!ibnl_chk_listeners(RDMA_NL_GROUP_LS)) {
1172 if (!ib_nl_make_request(query, gfp_mask))
1173 return id;
1174 }
1175 ib_sa_disable_local_svc(query);
1176 }
1177
1178 ret = ib_post_send_mad(query->mad_buf, NULL);
1179 if (ret) {
1180 spin_lock_irqsave(&idr_lock, flags);
1181 idr_remove(&query_idr, id);
1182 spin_unlock_irqrestore(&idr_lock, flags);
1183 }
1184
1185 /*
1186 * It's not safe to dereference query any more, because the
1187 * send may already have completed and freed the query in
1188 * another context.
1189 */
1190 return ret ? ret : id;
1191 }
1192
1193 void ib_sa_unpack_path(void *attribute, struct ib_sa_path_rec *rec)
1194 {
1195 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), attribute, rec);
1196 }
1197 EXPORT_SYMBOL(ib_sa_unpack_path);
1198
1199 void ib_sa_pack_path(struct ib_sa_path_rec *rec, void *attribute)
1200 {
1201 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, attribute);
1202 }
1203 EXPORT_SYMBOL(ib_sa_pack_path);
1204
1205 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
1206 int status,
1207 struct ib_sa_mad *mad)
1208 {
1209 struct ib_sa_path_query *query =
1210 container_of(sa_query, struct ib_sa_path_query, sa_query);
1211
1212 if (mad) {
1213 struct ib_sa_path_rec rec;
1214
1215 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
1216 mad->data, &rec);
1217 rec.net = NULL;
1218 rec.ifindex = 0;
1219 rec.gid_type = IB_GID_TYPE_IB;
1220 memset(rec.dmac, 0, ETH_ALEN);
1221 query->callback(status, &rec, query->context);
1222 } else
1223 query->callback(status, NULL, query->context);
1224 }
1225
1226 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
1227 {
1228 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query));
1229 }
1230
1231 /**
1232 * ib_sa_path_rec_get - Start a Path get query
1233 * @client:SA client
1234 * @device:device to send query on
1235 * @port_num: port number to send query on
1236 * @rec:Path Record to send in query
1237 * @comp_mask:component mask to send in query
1238 * @timeout_ms:time to wait for response
1239 * @gfp_mask:GFP mask to use for internal allocations
1240 * @callback:function called when query completes, times out or is
1241 * canceled
1242 * @context:opaque user context passed to callback
1243 * @sa_query:query context, used to cancel query
1244 *
1245 * Send a Path Record Get query to the SA to look up a path. The
1246 * callback function will be called when the query completes (or
1247 * fails); status is 0 for a successful response, -EINTR if the query
1248 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
1249 * occurred sending the query. The resp parameter of the callback is
1250 * only valid if status is 0.
1251 *
1252 * If the return value of ib_sa_path_rec_get() is negative, it is an
1253 * error code. Otherwise it is a query ID that can be used to cancel
1254 * the query.
1255 */
1256 int ib_sa_path_rec_get(struct ib_sa_client *client,
1257 struct ib_device *device, u8 port_num,
1258 struct ib_sa_path_rec *rec,
1259 ib_sa_comp_mask comp_mask,
1260 int timeout_ms, gfp_t gfp_mask,
1261 void (*callback)(int status,
1262 struct ib_sa_path_rec *resp,
1263 void *context),
1264 void *context,
1265 struct ib_sa_query **sa_query)
1266 {
1267 struct ib_sa_path_query *query;
1268 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1269 struct ib_sa_port *port;
1270 struct ib_mad_agent *agent;
1271 struct ib_sa_mad *mad;
1272 int ret;
1273
1274 if (!sa_dev)
1275 return -ENODEV;
1276
1277 port = &sa_dev->port[port_num - sa_dev->start_port];
1278 agent = port->agent;
1279
1280 query = kzalloc(sizeof(*query), gfp_mask);
1281 if (!query)
1282 return -ENOMEM;
1283
1284 query->sa_query.port = port;
1285 ret = alloc_mad(&query->sa_query, gfp_mask);
1286 if (ret)
1287 goto err1;
1288
1289 ib_sa_client_get(client);
1290 query->sa_query.client = client;
1291 query->callback = callback;
1292 query->context = context;
1293
1294 mad = query->sa_query.mad_buf->mad;
1295 init_mad(mad, agent);
1296
1297 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
1298 query->sa_query.release = ib_sa_path_rec_release;
1299 mad->mad_hdr.method = IB_MGMT_METHOD_GET;
1300 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC);
1301 mad->sa_hdr.comp_mask = comp_mask;
1302
1303 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data);
1304
1305 *sa_query = &query->sa_query;
1306
1307 query->sa_query.flags |= IB_SA_ENABLE_LOCAL_SERVICE;
1308 query->sa_query.mad_buf->context[1] = rec;
1309
1310 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1311 if (ret < 0)
1312 goto err2;
1313
1314 return ret;
1315
1316 err2:
1317 *sa_query = NULL;
1318 ib_sa_client_put(query->sa_query.client);
1319 free_mad(&query->sa_query);
1320
1321 err1:
1322 kfree(query);
1323 return ret;
1324 }
1325 EXPORT_SYMBOL(ib_sa_path_rec_get);
1326
1327 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query,
1328 int status,
1329 struct ib_sa_mad *mad)
1330 {
1331 struct ib_sa_service_query *query =
1332 container_of(sa_query, struct ib_sa_service_query, sa_query);
1333
1334 if (mad) {
1335 struct ib_sa_service_rec rec;
1336
1337 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table),
1338 mad->data, &rec);
1339 query->callback(status, &rec, query->context);
1340 } else
1341 query->callback(status, NULL, query->context);
1342 }
1343
1344 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query)
1345 {
1346 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query));
1347 }
1348
1349 /**
1350 * ib_sa_service_rec_query - Start Service Record operation
1351 * @client:SA client
1352 * @device:device to send request on
1353 * @port_num: port number to send request on
1354 * @method:SA method - should be get, set, or delete
1355 * @rec:Service Record to send in request
1356 * @comp_mask:component mask to send in request
1357 * @timeout_ms:time to wait for response
1358 * @gfp_mask:GFP mask to use for internal allocations
1359 * @callback:function called when request completes, times out or is
1360 * canceled
1361 * @context:opaque user context passed to callback
1362 * @sa_query:request context, used to cancel request
1363 *
1364 * Send a Service Record set/get/delete to the SA to register,
1365 * unregister or query a service record.
1366 * The callback function will be called when the request completes (or
1367 * fails); status is 0 for a successful response, -EINTR if the query
1368 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
1369 * occurred sending the query. The resp parameter of the callback is
1370 * only valid if status is 0.
1371 *
1372 * If the return value of ib_sa_service_rec_query() is negative, it is an
1373 * error code. Otherwise it is a request ID that can be used to cancel
1374 * the query.
1375 */
1376 int ib_sa_service_rec_query(struct ib_sa_client *client,
1377 struct ib_device *device, u8 port_num, u8 method,
1378 struct ib_sa_service_rec *rec,
1379 ib_sa_comp_mask comp_mask,
1380 int timeout_ms, gfp_t gfp_mask,
1381 void (*callback)(int status,
1382 struct ib_sa_service_rec *resp,
1383 void *context),
1384 void *context,
1385 struct ib_sa_query **sa_query)
1386 {
1387 struct ib_sa_service_query *query;
1388 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1389 struct ib_sa_port *port;
1390 struct ib_mad_agent *agent;
1391 struct ib_sa_mad *mad;
1392 int ret;
1393
1394 if (!sa_dev)
1395 return -ENODEV;
1396
1397 port = &sa_dev->port[port_num - sa_dev->start_port];
1398 agent = port->agent;
1399
1400 if (method != IB_MGMT_METHOD_GET &&
1401 method != IB_MGMT_METHOD_SET &&
1402 method != IB_SA_METHOD_DELETE)
1403 return -EINVAL;
1404
1405 query = kzalloc(sizeof(*query), gfp_mask);
1406 if (!query)
1407 return -ENOMEM;
1408
1409 query->sa_query.port = port;
1410 ret = alloc_mad(&query->sa_query, gfp_mask);
1411 if (ret)
1412 goto err1;
1413
1414 ib_sa_client_get(client);
1415 query->sa_query.client = client;
1416 query->callback = callback;
1417 query->context = context;
1418
1419 mad = query->sa_query.mad_buf->mad;
1420 init_mad(mad, agent);
1421
1422 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
1423 query->sa_query.release = ib_sa_service_rec_release;
1424 mad->mad_hdr.method = method;
1425 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
1426 mad->sa_hdr.comp_mask = comp_mask;
1427
1428 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table),
1429 rec, mad->data);
1430
1431 *sa_query = &query->sa_query;
1432
1433 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1434 if (ret < 0)
1435 goto err2;
1436
1437 return ret;
1438
1439 err2:
1440 *sa_query = NULL;
1441 ib_sa_client_put(query->sa_query.client);
1442 free_mad(&query->sa_query);
1443
1444 err1:
1445 kfree(query);
1446 return ret;
1447 }
1448 EXPORT_SYMBOL(ib_sa_service_rec_query);
1449
1450 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
1451 int status,
1452 struct ib_sa_mad *mad)
1453 {
1454 struct ib_sa_mcmember_query *query =
1455 container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
1456
1457 if (mad) {
1458 struct ib_sa_mcmember_rec rec;
1459
1460 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
1461 mad->data, &rec);
1462 query->callback(status, &rec, query->context);
1463 } else
1464 query->callback(status, NULL, query->context);
1465 }
1466
1467 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
1468 {
1469 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
1470 }
1471
1472 int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
1473 struct ib_device *device, u8 port_num,
1474 u8 method,
1475 struct ib_sa_mcmember_rec *rec,
1476 ib_sa_comp_mask comp_mask,
1477 int timeout_ms, gfp_t gfp_mask,
1478 void (*callback)(int status,
1479 struct ib_sa_mcmember_rec *resp,
1480 void *context),
1481 void *context,
1482 struct ib_sa_query **sa_query)
1483 {
1484 struct ib_sa_mcmember_query *query;
1485 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1486 struct ib_sa_port *port;
1487 struct ib_mad_agent *agent;
1488 struct ib_sa_mad *mad;
1489 int ret;
1490
1491 if (!sa_dev)
1492 return -ENODEV;
1493
1494 port = &sa_dev->port[port_num - sa_dev->start_port];
1495 agent = port->agent;
1496
1497 query = kzalloc(sizeof(*query), gfp_mask);
1498 if (!query)
1499 return -ENOMEM;
1500
1501 query->sa_query.port = port;
1502 ret = alloc_mad(&query->sa_query, gfp_mask);
1503 if (ret)
1504 goto err1;
1505
1506 ib_sa_client_get(client);
1507 query->sa_query.client = client;
1508 query->callback = callback;
1509 query->context = context;
1510
1511 mad = query->sa_query.mad_buf->mad;
1512 init_mad(mad, agent);
1513
1514 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
1515 query->sa_query.release = ib_sa_mcmember_rec_release;
1516 mad->mad_hdr.method = method;
1517 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
1518 mad->sa_hdr.comp_mask = comp_mask;
1519
1520 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
1521 rec, mad->data);
1522
1523 *sa_query = &query->sa_query;
1524
1525 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1526 if (ret < 0)
1527 goto err2;
1528
1529 return ret;
1530
1531 err2:
1532 *sa_query = NULL;
1533 ib_sa_client_put(query->sa_query.client);
1534 free_mad(&query->sa_query);
1535
1536 err1:
1537 kfree(query);
1538 return ret;
1539 }
1540
1541 /* Support GuidInfoRecord */
1542 static void ib_sa_guidinfo_rec_callback(struct ib_sa_query *sa_query,
1543 int status,
1544 struct ib_sa_mad *mad)
1545 {
1546 struct ib_sa_guidinfo_query *query =
1547 container_of(sa_query, struct ib_sa_guidinfo_query, sa_query);
1548
1549 if (mad) {
1550 struct ib_sa_guidinfo_rec rec;
1551
1552 ib_unpack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table),
1553 mad->data, &rec);
1554 query->callback(status, &rec, query->context);
1555 } else
1556 query->callback(status, NULL, query->context);
1557 }
1558
1559 static void ib_sa_guidinfo_rec_release(struct ib_sa_query *sa_query)
1560 {
1561 kfree(container_of(sa_query, struct ib_sa_guidinfo_query, sa_query));
1562 }
1563
1564 int ib_sa_guid_info_rec_query(struct ib_sa_client *client,
1565 struct ib_device *device, u8 port_num,
1566 struct ib_sa_guidinfo_rec *rec,
1567 ib_sa_comp_mask comp_mask, u8 method,
1568 int timeout_ms, gfp_t gfp_mask,
1569 void (*callback)(int status,
1570 struct ib_sa_guidinfo_rec *resp,
1571 void *context),
1572 void *context,
1573 struct ib_sa_query **sa_query)
1574 {
1575 struct ib_sa_guidinfo_query *query;
1576 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1577 struct ib_sa_port *port;
1578 struct ib_mad_agent *agent;
1579 struct ib_sa_mad *mad;
1580 int ret;
1581
1582 if (!sa_dev)
1583 return -ENODEV;
1584
1585 if (method != IB_MGMT_METHOD_GET &&
1586 method != IB_MGMT_METHOD_SET &&
1587 method != IB_SA_METHOD_DELETE) {
1588 return -EINVAL;
1589 }
1590
1591 port = &sa_dev->port[port_num - sa_dev->start_port];
1592 agent = port->agent;
1593
1594 query = kzalloc(sizeof(*query), gfp_mask);
1595 if (!query)
1596 return -ENOMEM;
1597
1598 query->sa_query.port = port;
1599 ret = alloc_mad(&query->sa_query, gfp_mask);
1600 if (ret)
1601 goto err1;
1602
1603 ib_sa_client_get(client);
1604 query->sa_query.client = client;
1605 query->callback = callback;
1606 query->context = context;
1607
1608 mad = query->sa_query.mad_buf->mad;
1609 init_mad(mad, agent);
1610
1611 query->sa_query.callback = callback ? ib_sa_guidinfo_rec_callback : NULL;
1612 query->sa_query.release = ib_sa_guidinfo_rec_release;
1613
1614 mad->mad_hdr.method = method;
1615 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_GUID_INFO_REC);
1616 mad->sa_hdr.comp_mask = comp_mask;
1617
1618 ib_pack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table), rec,
1619 mad->data);
1620
1621 *sa_query = &query->sa_query;
1622
1623 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1624 if (ret < 0)
1625 goto err2;
1626
1627 return ret;
1628
1629 err2:
1630 *sa_query = NULL;
1631 ib_sa_client_put(query->sa_query.client);
1632 free_mad(&query->sa_query);
1633
1634 err1:
1635 kfree(query);
1636 return ret;
1637 }
1638 EXPORT_SYMBOL(ib_sa_guid_info_rec_query);
1639
1640 static void send_handler(struct ib_mad_agent *agent,
1641 struct ib_mad_send_wc *mad_send_wc)
1642 {
1643 struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
1644 unsigned long flags;
1645
1646 if (query->callback)
1647 switch (mad_send_wc->status) {
1648 case IB_WC_SUCCESS:
1649 /* No callback -- already got recv */
1650 break;
1651 case IB_WC_RESP_TIMEOUT_ERR:
1652 query->callback(query, -ETIMEDOUT, NULL);
1653 break;
1654 case IB_WC_WR_FLUSH_ERR:
1655 query->callback(query, -EINTR, NULL);
1656 break;
1657 default:
1658 query->callback(query, -EIO, NULL);
1659 break;
1660 }
1661
1662 spin_lock_irqsave(&idr_lock, flags);
1663 idr_remove(&query_idr, query->id);
1664 spin_unlock_irqrestore(&idr_lock, flags);
1665
1666 free_mad(query);
1667 ib_sa_client_put(query->client);
1668 query->release(query);
1669 }
1670
1671 static void recv_handler(struct ib_mad_agent *mad_agent,
1672 struct ib_mad_recv_wc *mad_recv_wc)
1673 {
1674 struct ib_sa_query *query;
1675 struct ib_mad_send_buf *mad_buf;
1676
1677 mad_buf = (void *) (unsigned long) mad_recv_wc->wc->wr_id;
1678 query = mad_buf->context[0];
1679
1680 if (query->callback) {
1681 if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
1682 query->callback(query,
1683 mad_recv_wc->recv_buf.mad->mad_hdr.status ?
1684 -EINVAL : 0,
1685 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
1686 else
1687 query->callback(query, -EIO, NULL);
1688 }
1689
1690 ib_free_recv_mad(mad_recv_wc);
1691 }
1692
1693 static void ib_sa_add_one(struct ib_device *device)
1694 {
1695 struct ib_sa_device *sa_dev;
1696 int s, e, i;
1697 int count = 0;
1698
1699 s = rdma_start_port(device);
1700 e = rdma_end_port(device);
1701
1702 sa_dev = kzalloc(sizeof *sa_dev +
1703 (e - s + 1) * sizeof (struct ib_sa_port),
1704 GFP_KERNEL);
1705 if (!sa_dev)
1706 return;
1707
1708 sa_dev->start_port = s;
1709 sa_dev->end_port = e;
1710
1711 for (i = 0; i <= e - s; ++i) {
1712 spin_lock_init(&sa_dev->port[i].ah_lock);
1713 if (!rdma_cap_ib_sa(device, i + 1))
1714 continue;
1715
1716 sa_dev->port[i].sm_ah = NULL;
1717 sa_dev->port[i].port_num = i + s;
1718
1719 sa_dev->port[i].agent =
1720 ib_register_mad_agent(device, i + s, IB_QPT_GSI,
1721 NULL, 0, send_handler,
1722 recv_handler, sa_dev, 0);
1723 if (IS_ERR(sa_dev->port[i].agent))
1724 goto err;
1725
1726 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah);
1727
1728 count++;
1729 }
1730
1731 if (!count)
1732 goto free;
1733
1734 ib_set_client_data(device, &sa_client, sa_dev);
1735
1736 /*
1737 * We register our event handler after everything is set up,
1738 * and then update our cached info after the event handler is
1739 * registered to avoid any problems if a port changes state
1740 * during our initialization.
1741 */
1742
1743 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
1744 if (ib_register_event_handler(&sa_dev->event_handler))
1745 goto err;
1746
1747 for (i = 0; i <= e - s; ++i) {
1748 if (rdma_cap_ib_sa(device, i + 1))
1749 update_sm_ah(&sa_dev->port[i].update_task);
1750 }
1751
1752 return;
1753
1754 err:
1755 while (--i >= 0) {
1756 if (rdma_cap_ib_sa(device, i + 1))
1757 ib_unregister_mad_agent(sa_dev->port[i].agent);
1758 }
1759 free:
1760 kfree(sa_dev);
1761 return;
1762 }
1763
1764 static void ib_sa_remove_one(struct ib_device *device, void *client_data)
1765 {
1766 struct ib_sa_device *sa_dev = client_data;
1767 int i;
1768
1769 if (!sa_dev)
1770 return;
1771
1772 ib_unregister_event_handler(&sa_dev->event_handler);
1773
1774 flush_workqueue(ib_wq);
1775
1776 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
1777 if (rdma_cap_ib_sa(device, i + 1)) {
1778 ib_unregister_mad_agent(sa_dev->port[i].agent);
1779 if (sa_dev->port[i].sm_ah)
1780 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
1781 }
1782
1783 }
1784
1785 kfree(sa_dev);
1786 }
1787
1788 static int __init ib_sa_init(void)
1789 {
1790 int ret;
1791
1792 get_random_bytes(&tid, sizeof tid);
1793
1794 atomic_set(&ib_nl_sa_request_seq, 0);
1795
1796 ret = ib_register_client(&sa_client);
1797 if (ret) {
1798 printk(KERN_ERR "Couldn't register ib_sa client\n");
1799 goto err1;
1800 }
1801
1802 ret = mcast_init();
1803 if (ret) {
1804 printk(KERN_ERR "Couldn't initialize multicast handling\n");
1805 goto err2;
1806 }
1807
1808 ib_nl_wq = create_singlethread_workqueue("ib_nl_sa_wq");
1809 if (!ib_nl_wq) {
1810 ret = -ENOMEM;
1811 goto err3;
1812 }
1813
1814 if (ibnl_add_client(RDMA_NL_LS, RDMA_NL_LS_NUM_OPS,
1815 ib_sa_cb_table)) {
1816 pr_err("Failed to add netlink callback\n");
1817 ret = -EINVAL;
1818 goto err4;
1819 }
1820 INIT_DELAYED_WORK(&ib_nl_timed_work, ib_nl_request_timeout);
1821
1822 return 0;
1823 err4:
1824 destroy_workqueue(ib_nl_wq);
1825 err3:
1826 mcast_cleanup();
1827 err2:
1828 ib_unregister_client(&sa_client);
1829 err1:
1830 return ret;
1831 }
1832
1833 static void __exit ib_sa_cleanup(void)
1834 {
1835 ibnl_remove_client(RDMA_NL_LS);
1836 cancel_delayed_work(&ib_nl_timed_work);
1837 flush_workqueue(ib_nl_wq);
1838 destroy_workqueue(ib_nl_wq);
1839 mcast_cleanup();
1840 ib_unregister_client(&sa_client);
1841 idr_destroy(&query_idr);
1842 }
1843
1844 module_init(ib_sa_init);
1845 module_exit(ib_sa_cleanup);
Linux kernel - Deliverables
This page took 0.064807 seconds and 4 git commands to generate.