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IB/SA: Use correct free function
[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 nlmsg_free(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 (!(nlh->nlmsg_flags & NLM_F_REQUEST) ||
721 !(NETLINK_CB(skb).sk) ||
722 !netlink_capable(skb, CAP_NET_ADMIN))
723 return -EPERM;
724
725 ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
726 nlmsg_len(nlh), ib_nl_policy);
727 attr = (const struct nlattr *)tb[LS_NLA_TYPE_TIMEOUT];
728 if (ret || !attr)
729 goto settimeout_out;
730
731 timeout = *(int *) nla_data(attr);
732 if (timeout < IB_SA_LOCAL_SVC_TIMEOUT_MIN)
733 timeout = IB_SA_LOCAL_SVC_TIMEOUT_MIN;
734 if (timeout > IB_SA_LOCAL_SVC_TIMEOUT_MAX)
735 timeout = IB_SA_LOCAL_SVC_TIMEOUT_MAX;
736
737 delta = timeout - sa_local_svc_timeout_ms;
738 if (delta < 0)
739 abs_delta = -delta;
740 else
741 abs_delta = delta;
742
743 if (delta != 0) {
744 spin_lock_irqsave(&ib_nl_request_lock, flags);
745 sa_local_svc_timeout_ms = timeout;
746 list_for_each_entry(query, &ib_nl_request_list, list) {
747 if (delta < 0 && abs_delta > query->timeout)
748 query->timeout = 0;
749 else
750 query->timeout += delta;
751
752 /* Get the new delay from the first entry */
753 if (!delay) {
754 delay = query->timeout - jiffies;
755 if (delay <= 0)
756 delay = 1;
757 }
758 }
759 if (delay)
760 mod_delayed_work(ib_nl_wq, &ib_nl_timed_work,
761 (unsigned long)delay);
762 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
763 }
764
765 settimeout_out:
766 return skb->len;
767 }
768
769 static inline int ib_nl_is_good_resolve_resp(const struct nlmsghdr *nlh)
770 {
771 struct nlattr *tb[LS_NLA_TYPE_MAX];
772 int ret;
773
774 if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR)
775 return 0;
776
777 ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
778 nlmsg_len(nlh), ib_nl_policy);
779 if (ret)
780 return 0;
781
782 return 1;
783 }
784
785 static int ib_nl_handle_resolve_resp(struct sk_buff *skb,
786 struct netlink_callback *cb)
787 {
788 const struct nlmsghdr *nlh = (struct nlmsghdr *)cb->nlh;
789 unsigned long flags;
790 struct ib_sa_query *query;
791 struct ib_mad_send_buf *send_buf;
792 struct ib_mad_send_wc mad_send_wc;
793 int found = 0;
794 int ret;
795
796 if ((nlh->nlmsg_flags & NLM_F_REQUEST) ||
797 !(NETLINK_CB(skb).sk) ||
798 !netlink_capable(skb, CAP_NET_ADMIN))
799 return -EPERM;
800
801 spin_lock_irqsave(&ib_nl_request_lock, flags);
802 list_for_each_entry(query, &ib_nl_request_list, list) {
803 /*
804 * If the query is cancelled, let the timeout routine
805 * take care of it.
806 */
807 if (nlh->nlmsg_seq == query->seq) {
808 found = !ib_sa_query_cancelled(query);
809 if (found)
810 list_del(&query->list);
811 break;
812 }
813 }
814
815 if (!found) {
816 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
817 goto resp_out;
818 }
819
820 send_buf = query->mad_buf;
821
822 if (!ib_nl_is_good_resolve_resp(nlh)) {
823 /* if the result is a failure, send out the packet via IB */
824 ib_sa_disable_local_svc(query);
825 ret = ib_post_send_mad(query->mad_buf, NULL);
826 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
827 if (ret) {
828 mad_send_wc.send_buf = send_buf;
829 mad_send_wc.status = IB_WC_GENERAL_ERR;
830 send_handler(query->port->agent, &mad_send_wc);
831 }
832 } else {
833 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
834 ib_nl_process_good_resolve_rsp(query, nlh);
835 }
836
837 resp_out:
838 return skb->len;
839 }
840
841 static struct ibnl_client_cbs ib_sa_cb_table[] = {
842 [RDMA_NL_LS_OP_RESOLVE] = {
843 .dump = ib_nl_handle_resolve_resp,
844 .module = THIS_MODULE },
845 [RDMA_NL_LS_OP_SET_TIMEOUT] = {
846 .dump = ib_nl_handle_set_timeout,
847 .module = THIS_MODULE },
848 };
849
850 static void free_sm_ah(struct kref *kref)
851 {
852 struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref);
853
854 ib_destroy_ah(sm_ah->ah);
855 kfree(sm_ah);
856 }
857
858 static void update_sm_ah(struct work_struct *work)
859 {
860 struct ib_sa_port *port =
861 container_of(work, struct ib_sa_port, update_task);
862 struct ib_sa_sm_ah *new_ah;
863 struct ib_port_attr port_attr;
864 struct ib_ah_attr ah_attr;
865
866 if (ib_query_port(port->agent->device, port->port_num, &port_attr)) {
867 pr_warn("Couldn't query port\n");
868 return;
869 }
870
871 new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL);
872 if (!new_ah) {
873 return;
874 }
875
876 kref_init(&new_ah->ref);
877 new_ah->src_path_mask = (1 << port_attr.lmc) - 1;
878
879 new_ah->pkey_index = 0;
880 if (ib_find_pkey(port->agent->device, port->port_num,
881 IB_DEFAULT_PKEY_FULL, &new_ah->pkey_index))
882 pr_err("Couldn't find index for default PKey\n");
883
884 memset(&ah_attr, 0, sizeof ah_attr);
885 ah_attr.dlid = port_attr.sm_lid;
886 ah_attr.sl = port_attr.sm_sl;
887 ah_attr.port_num = port->port_num;
888 if (port_attr.grh_required) {
889 ah_attr.ah_flags = IB_AH_GRH;
890 ah_attr.grh.dgid.global.subnet_prefix = cpu_to_be64(port_attr.subnet_prefix);
891 ah_attr.grh.dgid.global.interface_id = cpu_to_be64(IB_SA_WELL_KNOWN_GUID);
892 }
893
894 new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr);
895 if (IS_ERR(new_ah->ah)) {
896 pr_warn("Couldn't create new SM AH\n");
897 kfree(new_ah);
898 return;
899 }
900
901 spin_lock_irq(&port->ah_lock);
902 if (port->sm_ah)
903 kref_put(&port->sm_ah->ref, free_sm_ah);
904 port->sm_ah = new_ah;
905 spin_unlock_irq(&port->ah_lock);
906
907 }
908
909 static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event)
910 {
911 if (event->event == IB_EVENT_PORT_ERR ||
912 event->event == IB_EVENT_PORT_ACTIVE ||
913 event->event == IB_EVENT_LID_CHANGE ||
914 event->event == IB_EVENT_PKEY_CHANGE ||
915 event->event == IB_EVENT_SM_CHANGE ||
916 event->event == IB_EVENT_CLIENT_REREGISTER) {
917 unsigned long flags;
918 struct ib_sa_device *sa_dev =
919 container_of(handler, typeof(*sa_dev), event_handler);
920 struct ib_sa_port *port =
921 &sa_dev->port[event->element.port_num - sa_dev->start_port];
922
923 if (!rdma_cap_ib_sa(handler->device, port->port_num))
924 return;
925
926 spin_lock_irqsave(&port->ah_lock, flags);
927 if (port->sm_ah)
928 kref_put(&port->sm_ah->ref, free_sm_ah);
929 port->sm_ah = NULL;
930 spin_unlock_irqrestore(&port->ah_lock, flags);
931
932 queue_work(ib_wq, &sa_dev->port[event->element.port_num -
933 sa_dev->start_port].update_task);
934 }
935 }
936
937 void ib_sa_register_client(struct ib_sa_client *client)
938 {
939 atomic_set(&client->users, 1);
940 init_completion(&client->comp);
941 }
942 EXPORT_SYMBOL(ib_sa_register_client);
943
944 void ib_sa_unregister_client(struct ib_sa_client *client)
945 {
946 ib_sa_client_put(client);
947 wait_for_completion(&client->comp);
948 }
949 EXPORT_SYMBOL(ib_sa_unregister_client);
950
951 /**
952 * ib_sa_cancel_query - try to cancel an SA query
953 * @id:ID of query to cancel
954 * @query:query pointer to cancel
955 *
956 * Try to cancel an SA query. If the id and query don't match up or
957 * the query has already completed, nothing is done. Otherwise the
958 * query is canceled and will complete with a status of -EINTR.
959 */
960 void ib_sa_cancel_query(int id, struct ib_sa_query *query)
961 {
962 unsigned long flags;
963 struct ib_mad_agent *agent;
964 struct ib_mad_send_buf *mad_buf;
965
966 spin_lock_irqsave(&idr_lock, flags);
967 if (idr_find(&query_idr, id) != query) {
968 spin_unlock_irqrestore(&idr_lock, flags);
969 return;
970 }
971 agent = query->port->agent;
972 mad_buf = query->mad_buf;
973 spin_unlock_irqrestore(&idr_lock, flags);
974
975 /*
976 * If the query is still on the netlink request list, schedule
977 * it to be cancelled by the timeout routine. Otherwise, it has been
978 * sent to the MAD layer and has to be cancelled from there.
979 */
980 if (!ib_nl_cancel_request(query))
981 ib_cancel_mad(agent, mad_buf);
982 }
983 EXPORT_SYMBOL(ib_sa_cancel_query);
984
985 static u8 get_src_path_mask(struct ib_device *device, u8 port_num)
986 {
987 struct ib_sa_device *sa_dev;
988 struct ib_sa_port *port;
989 unsigned long flags;
990 u8 src_path_mask;
991
992 sa_dev = ib_get_client_data(device, &sa_client);
993 if (!sa_dev)
994 return 0x7f;
995
996 port = &sa_dev->port[port_num - sa_dev->start_port];
997 spin_lock_irqsave(&port->ah_lock, flags);
998 src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f;
999 spin_unlock_irqrestore(&port->ah_lock, flags);
1000
1001 return src_path_mask;
1002 }
1003
1004 int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
1005 struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr)
1006 {
1007 int ret;
1008 u16 gid_index;
1009 int use_roce;
1010 struct net_device *ndev = NULL;
1011
1012 memset(ah_attr, 0, sizeof *ah_attr);
1013 ah_attr->dlid = be16_to_cpu(rec->dlid);
1014 ah_attr->sl = rec->sl;
1015 ah_attr->src_path_bits = be16_to_cpu(rec->slid) &
1016 get_src_path_mask(device, port_num);
1017 ah_attr->port_num = port_num;
1018 ah_attr->static_rate = rec->rate;
1019
1020 use_roce = rdma_cap_eth_ah(device, port_num);
1021
1022 if (use_roce) {
1023 struct net_device *idev;
1024 struct net_device *resolved_dev;
1025 struct rdma_dev_addr dev_addr = {.bound_dev_if = rec->ifindex,
1026 .net = rec->net ? rec->net :
1027 &init_net};
1028 union {
1029 struct sockaddr _sockaddr;
1030 struct sockaddr_in _sockaddr_in;
1031 struct sockaddr_in6 _sockaddr_in6;
1032 } sgid_addr, dgid_addr;
1033
1034 if (!device->get_netdev)
1035 return -EOPNOTSUPP;
1036
1037 rdma_gid2ip(&sgid_addr._sockaddr, &rec->sgid);
1038 rdma_gid2ip(&dgid_addr._sockaddr, &rec->dgid);
1039
1040 /* validate the route */
1041 ret = rdma_resolve_ip_route(&sgid_addr._sockaddr,
1042 &dgid_addr._sockaddr, &dev_addr);
1043 if (ret)
1044 return ret;
1045
1046 if ((dev_addr.network == RDMA_NETWORK_IPV4 ||
1047 dev_addr.network == RDMA_NETWORK_IPV6) &&
1048 rec->gid_type != IB_GID_TYPE_ROCE_UDP_ENCAP)
1049 return -EINVAL;
1050
1051 idev = device->get_netdev(device, port_num);
1052 if (!idev)
1053 return -ENODEV;
1054
1055 resolved_dev = dev_get_by_index(dev_addr.net,
1056 dev_addr.bound_dev_if);
1057 if (resolved_dev->flags & IFF_LOOPBACK) {
1058 dev_put(resolved_dev);
1059 resolved_dev = idev;
1060 dev_hold(resolved_dev);
1061 }
1062 ndev = ib_get_ndev_from_path(rec);
1063 rcu_read_lock();
1064 if ((ndev && ndev != resolved_dev) ||
1065 (resolved_dev != idev &&
1066 !rdma_is_upper_dev_rcu(idev, resolved_dev)))
1067 ret = -EHOSTUNREACH;
1068 rcu_read_unlock();
1069 dev_put(idev);
1070 dev_put(resolved_dev);
1071 if (ret) {
1072 if (ndev)
1073 dev_put(ndev);
1074 return ret;
1075 }
1076 }
1077
1078 if (rec->hop_limit > 0 || use_roce) {
1079 ah_attr->ah_flags = IB_AH_GRH;
1080 ah_attr->grh.dgid = rec->dgid;
1081
1082 ret = ib_find_cached_gid_by_port(device, &rec->sgid,
1083 rec->gid_type, port_num, ndev,
1084 &gid_index);
1085 if (ret) {
1086 if (ndev)
1087 dev_put(ndev);
1088 return ret;
1089 }
1090
1091 ah_attr->grh.sgid_index = gid_index;
1092 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
1093 ah_attr->grh.hop_limit = rec->hop_limit;
1094 ah_attr->grh.traffic_class = rec->traffic_class;
1095 if (ndev)
1096 dev_put(ndev);
1097 }
1098
1099 if (use_roce)
1100 memcpy(ah_attr->dmac, rec->dmac, ETH_ALEN);
1101
1102 return 0;
1103 }
1104 EXPORT_SYMBOL(ib_init_ah_from_path);
1105
1106 static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask)
1107 {
1108 unsigned long flags;
1109
1110 spin_lock_irqsave(&query->port->ah_lock, flags);
1111 if (!query->port->sm_ah) {
1112 spin_unlock_irqrestore(&query->port->ah_lock, flags);
1113 return -EAGAIN;
1114 }
1115 kref_get(&query->port->sm_ah->ref);
1116 query->sm_ah = query->port->sm_ah;
1117 spin_unlock_irqrestore(&query->port->ah_lock, flags);
1118
1119 query->mad_buf = ib_create_send_mad(query->port->agent, 1,
1120 query->sm_ah->pkey_index,
1121 0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA,
1122 gfp_mask,
1123 IB_MGMT_BASE_VERSION);
1124 if (IS_ERR(query->mad_buf)) {
1125 kref_put(&query->sm_ah->ref, free_sm_ah);
1126 return -ENOMEM;
1127 }
1128
1129 query->mad_buf->ah = query->sm_ah->ah;
1130
1131 return 0;
1132 }
1133
1134 static void free_mad(struct ib_sa_query *query)
1135 {
1136 ib_free_send_mad(query->mad_buf);
1137 kref_put(&query->sm_ah->ref, free_sm_ah);
1138 }
1139
1140 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
1141 {
1142 unsigned long flags;
1143
1144 memset(mad, 0, sizeof *mad);
1145
1146 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION;
1147 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
1148 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
1149
1150 spin_lock_irqsave(&tid_lock, flags);
1151 mad->mad_hdr.tid =
1152 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
1153 spin_unlock_irqrestore(&tid_lock, flags);
1154 }
1155
1156 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask)
1157 {
1158 bool preload = gfpflags_allow_blocking(gfp_mask);
1159 unsigned long flags;
1160 int ret, id;
1161
1162 if (preload)
1163 idr_preload(gfp_mask);
1164 spin_lock_irqsave(&idr_lock, flags);
1165
1166 id = idr_alloc(&query_idr, query, 0, 0, GFP_NOWAIT);
1167
1168 spin_unlock_irqrestore(&idr_lock, flags);
1169 if (preload)
1170 idr_preload_end();
1171 if (id < 0)
1172 return id;
1173
1174 query->mad_buf->timeout_ms = timeout_ms;
1175 query->mad_buf->context[0] = query;
1176 query->id = id;
1177
1178 if (query->flags & IB_SA_ENABLE_LOCAL_SERVICE) {
1179 if (!ibnl_chk_listeners(RDMA_NL_GROUP_LS)) {
1180 if (!ib_nl_make_request(query, gfp_mask))
1181 return id;
1182 }
1183 ib_sa_disable_local_svc(query);
1184 }
1185
1186 ret = ib_post_send_mad(query->mad_buf, NULL);
1187 if (ret) {
1188 spin_lock_irqsave(&idr_lock, flags);
1189 idr_remove(&query_idr, id);
1190 spin_unlock_irqrestore(&idr_lock, flags);
1191 }
1192
1193 /*
1194 * It's not safe to dereference query any more, because the
1195 * send may already have completed and freed the query in
1196 * another context.
1197 */
1198 return ret ? ret : id;
1199 }
1200
1201 void ib_sa_unpack_path(void *attribute, struct ib_sa_path_rec *rec)
1202 {
1203 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), attribute, rec);
1204 }
1205 EXPORT_SYMBOL(ib_sa_unpack_path);
1206
1207 void ib_sa_pack_path(struct ib_sa_path_rec *rec, void *attribute)
1208 {
1209 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, attribute);
1210 }
1211 EXPORT_SYMBOL(ib_sa_pack_path);
1212
1213 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
1214 int status,
1215 struct ib_sa_mad *mad)
1216 {
1217 struct ib_sa_path_query *query =
1218 container_of(sa_query, struct ib_sa_path_query, sa_query);
1219
1220 if (mad) {
1221 struct ib_sa_path_rec rec;
1222
1223 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
1224 mad->data, &rec);
1225 rec.net = NULL;
1226 rec.ifindex = 0;
1227 rec.gid_type = IB_GID_TYPE_IB;
1228 eth_zero_addr(rec.dmac);
1229 query->callback(status, &rec, query->context);
1230 } else
1231 query->callback(status, NULL, query->context);
1232 }
1233
1234 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
1235 {
1236 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query));
1237 }
1238
1239 /**
1240 * ib_sa_path_rec_get - Start a Path get query
1241 * @client:SA client
1242 * @device:device to send query on
1243 * @port_num: port number to send query on
1244 * @rec:Path Record to send in query
1245 * @comp_mask:component mask to send in query
1246 * @timeout_ms:time to wait for response
1247 * @gfp_mask:GFP mask to use for internal allocations
1248 * @callback:function called when query completes, times out or is
1249 * canceled
1250 * @context:opaque user context passed to callback
1251 * @sa_query:query context, used to cancel query
1252 *
1253 * Send a Path Record Get query to the SA to look up a path. The
1254 * callback function will be called when the query completes (or
1255 * fails); status is 0 for a successful response, -EINTR if the query
1256 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
1257 * occurred sending the query. The resp parameter of the callback is
1258 * only valid if status is 0.
1259 *
1260 * If the return value of ib_sa_path_rec_get() is negative, it is an
1261 * error code. Otherwise it is a query ID that can be used to cancel
1262 * the query.
1263 */
1264 int ib_sa_path_rec_get(struct ib_sa_client *client,
1265 struct ib_device *device, u8 port_num,
1266 struct ib_sa_path_rec *rec,
1267 ib_sa_comp_mask comp_mask,
1268 int timeout_ms, gfp_t gfp_mask,
1269 void (*callback)(int status,
1270 struct ib_sa_path_rec *resp,
1271 void *context),
1272 void *context,
1273 struct ib_sa_query **sa_query)
1274 {
1275 struct ib_sa_path_query *query;
1276 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1277 struct ib_sa_port *port;
1278 struct ib_mad_agent *agent;
1279 struct ib_sa_mad *mad;
1280 int ret;
1281
1282 if (!sa_dev)
1283 return -ENODEV;
1284
1285 port = &sa_dev->port[port_num - sa_dev->start_port];
1286 agent = port->agent;
1287
1288 query = kzalloc(sizeof(*query), gfp_mask);
1289 if (!query)
1290 return -ENOMEM;
1291
1292 query->sa_query.port = port;
1293 ret = alloc_mad(&query->sa_query, gfp_mask);
1294 if (ret)
1295 goto err1;
1296
1297 ib_sa_client_get(client);
1298 query->sa_query.client = client;
1299 query->callback = callback;
1300 query->context = context;
1301
1302 mad = query->sa_query.mad_buf->mad;
1303 init_mad(mad, agent);
1304
1305 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
1306 query->sa_query.release = ib_sa_path_rec_release;
1307 mad->mad_hdr.method = IB_MGMT_METHOD_GET;
1308 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC);
1309 mad->sa_hdr.comp_mask = comp_mask;
1310
1311 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data);
1312
1313 *sa_query = &query->sa_query;
1314
1315 query->sa_query.flags |= IB_SA_ENABLE_LOCAL_SERVICE;
1316 query->sa_query.mad_buf->context[1] = rec;
1317
1318 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1319 if (ret < 0)
1320 goto err2;
1321
1322 return ret;
1323
1324 err2:
1325 *sa_query = NULL;
1326 ib_sa_client_put(query->sa_query.client);
1327 free_mad(&query->sa_query);
1328
1329 err1:
1330 kfree(query);
1331 return ret;
1332 }
1333 EXPORT_SYMBOL(ib_sa_path_rec_get);
1334
1335 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query,
1336 int status,
1337 struct ib_sa_mad *mad)
1338 {
1339 struct ib_sa_service_query *query =
1340 container_of(sa_query, struct ib_sa_service_query, sa_query);
1341
1342 if (mad) {
1343 struct ib_sa_service_rec rec;
1344
1345 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table),
1346 mad->data, &rec);
1347 query->callback(status, &rec, query->context);
1348 } else
1349 query->callback(status, NULL, query->context);
1350 }
1351
1352 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query)
1353 {
1354 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query));
1355 }
1356
1357 /**
1358 * ib_sa_service_rec_query - Start Service Record operation
1359 * @client:SA client
1360 * @device:device to send request on
1361 * @port_num: port number to send request on
1362 * @method:SA method - should be get, set, or delete
1363 * @rec:Service Record to send in request
1364 * @comp_mask:component mask to send in request
1365 * @timeout_ms:time to wait for response
1366 * @gfp_mask:GFP mask to use for internal allocations
1367 * @callback:function called when request completes, times out or is
1368 * canceled
1369 * @context:opaque user context passed to callback
1370 * @sa_query:request context, used to cancel request
1371 *
1372 * Send a Service Record set/get/delete to the SA to register,
1373 * unregister or query a service record.
1374 * The callback function will be called when the request completes (or
1375 * fails); status is 0 for a successful response, -EINTR if the query
1376 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
1377 * occurred sending the query. The resp parameter of the callback is
1378 * only valid if status is 0.
1379 *
1380 * If the return value of ib_sa_service_rec_query() is negative, it is an
1381 * error code. Otherwise it is a request ID that can be used to cancel
1382 * the query.
1383 */
1384 int ib_sa_service_rec_query(struct ib_sa_client *client,
1385 struct ib_device *device, u8 port_num, u8 method,
1386 struct ib_sa_service_rec *rec,
1387 ib_sa_comp_mask comp_mask,
1388 int timeout_ms, gfp_t gfp_mask,
1389 void (*callback)(int status,
1390 struct ib_sa_service_rec *resp,
1391 void *context),
1392 void *context,
1393 struct ib_sa_query **sa_query)
1394 {
1395 struct ib_sa_service_query *query;
1396 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1397 struct ib_sa_port *port;
1398 struct ib_mad_agent *agent;
1399 struct ib_sa_mad *mad;
1400 int ret;
1401
1402 if (!sa_dev)
1403 return -ENODEV;
1404
1405 port = &sa_dev->port[port_num - sa_dev->start_port];
1406 agent = port->agent;
1407
1408 if (method != IB_MGMT_METHOD_GET &&
1409 method != IB_MGMT_METHOD_SET &&
1410 method != IB_SA_METHOD_DELETE)
1411 return -EINVAL;
1412
1413 query = kzalloc(sizeof(*query), gfp_mask);
1414 if (!query)
1415 return -ENOMEM;
1416
1417 query->sa_query.port = port;
1418 ret = alloc_mad(&query->sa_query, gfp_mask);
1419 if (ret)
1420 goto err1;
1421
1422 ib_sa_client_get(client);
1423 query->sa_query.client = client;
1424 query->callback = callback;
1425 query->context = context;
1426
1427 mad = query->sa_query.mad_buf->mad;
1428 init_mad(mad, agent);
1429
1430 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
1431 query->sa_query.release = ib_sa_service_rec_release;
1432 mad->mad_hdr.method = method;
1433 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
1434 mad->sa_hdr.comp_mask = comp_mask;
1435
1436 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table),
1437 rec, mad->data);
1438
1439 *sa_query = &query->sa_query;
1440
1441 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1442 if (ret < 0)
1443 goto err2;
1444
1445 return ret;
1446
1447 err2:
1448 *sa_query = NULL;
1449 ib_sa_client_put(query->sa_query.client);
1450 free_mad(&query->sa_query);
1451
1452 err1:
1453 kfree(query);
1454 return ret;
1455 }
1456 EXPORT_SYMBOL(ib_sa_service_rec_query);
1457
1458 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
1459 int status,
1460 struct ib_sa_mad *mad)
1461 {
1462 struct ib_sa_mcmember_query *query =
1463 container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
1464
1465 if (mad) {
1466 struct ib_sa_mcmember_rec rec;
1467
1468 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
1469 mad->data, &rec);
1470 query->callback(status, &rec, query->context);
1471 } else
1472 query->callback(status, NULL, query->context);
1473 }
1474
1475 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
1476 {
1477 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
1478 }
1479
1480 int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
1481 struct ib_device *device, u8 port_num,
1482 u8 method,
1483 struct ib_sa_mcmember_rec *rec,
1484 ib_sa_comp_mask comp_mask,
1485 int timeout_ms, gfp_t gfp_mask,
1486 void (*callback)(int status,
1487 struct ib_sa_mcmember_rec *resp,
1488 void *context),
1489 void *context,
1490 struct ib_sa_query **sa_query)
1491 {
1492 struct ib_sa_mcmember_query *query;
1493 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1494 struct ib_sa_port *port;
1495 struct ib_mad_agent *agent;
1496 struct ib_sa_mad *mad;
1497 int ret;
1498
1499 if (!sa_dev)
1500 return -ENODEV;
1501
1502 port = &sa_dev->port[port_num - sa_dev->start_port];
1503 agent = port->agent;
1504
1505 query = kzalloc(sizeof(*query), gfp_mask);
1506 if (!query)
1507 return -ENOMEM;
1508
1509 query->sa_query.port = port;
1510 ret = alloc_mad(&query->sa_query, gfp_mask);
1511 if (ret)
1512 goto err1;
1513
1514 ib_sa_client_get(client);
1515 query->sa_query.client = client;
1516 query->callback = callback;
1517 query->context = context;
1518
1519 mad = query->sa_query.mad_buf->mad;
1520 init_mad(mad, agent);
1521
1522 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
1523 query->sa_query.release = ib_sa_mcmember_rec_release;
1524 mad->mad_hdr.method = method;
1525 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
1526 mad->sa_hdr.comp_mask = comp_mask;
1527
1528 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
1529 rec, mad->data);
1530
1531 *sa_query = &query->sa_query;
1532
1533 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1534 if (ret < 0)
1535 goto err2;
1536
1537 return ret;
1538
1539 err2:
1540 *sa_query = NULL;
1541 ib_sa_client_put(query->sa_query.client);
1542 free_mad(&query->sa_query);
1543
1544 err1:
1545 kfree(query);
1546 return ret;
1547 }
1548
1549 /* Support GuidInfoRecord */
1550 static void ib_sa_guidinfo_rec_callback(struct ib_sa_query *sa_query,
1551 int status,
1552 struct ib_sa_mad *mad)
1553 {
1554 struct ib_sa_guidinfo_query *query =
1555 container_of(sa_query, struct ib_sa_guidinfo_query, sa_query);
1556
1557 if (mad) {
1558 struct ib_sa_guidinfo_rec rec;
1559
1560 ib_unpack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table),
1561 mad->data, &rec);
1562 query->callback(status, &rec, query->context);
1563 } else
1564 query->callback(status, NULL, query->context);
1565 }
1566
1567 static void ib_sa_guidinfo_rec_release(struct ib_sa_query *sa_query)
1568 {
1569 kfree(container_of(sa_query, struct ib_sa_guidinfo_query, sa_query));
1570 }
1571
1572 int ib_sa_guid_info_rec_query(struct ib_sa_client *client,
1573 struct ib_device *device, u8 port_num,
1574 struct ib_sa_guidinfo_rec *rec,
1575 ib_sa_comp_mask comp_mask, u8 method,
1576 int timeout_ms, gfp_t gfp_mask,
1577 void (*callback)(int status,
1578 struct ib_sa_guidinfo_rec *resp,
1579 void *context),
1580 void *context,
1581 struct ib_sa_query **sa_query)
1582 {
1583 struct ib_sa_guidinfo_query *query;
1584 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1585 struct ib_sa_port *port;
1586 struct ib_mad_agent *agent;
1587 struct ib_sa_mad *mad;
1588 int ret;
1589
1590 if (!sa_dev)
1591 return -ENODEV;
1592
1593 if (method != IB_MGMT_METHOD_GET &&
1594 method != IB_MGMT_METHOD_SET &&
1595 method != IB_SA_METHOD_DELETE) {
1596 return -EINVAL;
1597 }
1598
1599 port = &sa_dev->port[port_num - sa_dev->start_port];
1600 agent = port->agent;
1601
1602 query = kzalloc(sizeof(*query), gfp_mask);
1603 if (!query)
1604 return -ENOMEM;
1605
1606 query->sa_query.port = port;
1607 ret = alloc_mad(&query->sa_query, gfp_mask);
1608 if (ret)
1609 goto err1;
1610
1611 ib_sa_client_get(client);
1612 query->sa_query.client = client;
1613 query->callback = callback;
1614 query->context = context;
1615
1616 mad = query->sa_query.mad_buf->mad;
1617 init_mad(mad, agent);
1618
1619 query->sa_query.callback = callback ? ib_sa_guidinfo_rec_callback : NULL;
1620 query->sa_query.release = ib_sa_guidinfo_rec_release;
1621
1622 mad->mad_hdr.method = method;
1623 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_GUID_INFO_REC);
1624 mad->sa_hdr.comp_mask = comp_mask;
1625
1626 ib_pack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table), rec,
1627 mad->data);
1628
1629 *sa_query = &query->sa_query;
1630
1631 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1632 if (ret < 0)
1633 goto err2;
1634
1635 return ret;
1636
1637 err2:
1638 *sa_query = NULL;
1639 ib_sa_client_put(query->sa_query.client);
1640 free_mad(&query->sa_query);
1641
1642 err1:
1643 kfree(query);
1644 return ret;
1645 }
1646 EXPORT_SYMBOL(ib_sa_guid_info_rec_query);
1647
1648 static void send_handler(struct ib_mad_agent *agent,
1649 struct ib_mad_send_wc *mad_send_wc)
1650 {
1651 struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
1652 unsigned long flags;
1653
1654 if (query->callback)
1655 switch (mad_send_wc->status) {
1656 case IB_WC_SUCCESS:
1657 /* No callback -- already got recv */
1658 break;
1659 case IB_WC_RESP_TIMEOUT_ERR:
1660 query->callback(query, -ETIMEDOUT, NULL);
1661 break;
1662 case IB_WC_WR_FLUSH_ERR:
1663 query->callback(query, -EINTR, NULL);
1664 break;
1665 default:
1666 query->callback(query, -EIO, NULL);
1667 break;
1668 }
1669
1670 spin_lock_irqsave(&idr_lock, flags);
1671 idr_remove(&query_idr, query->id);
1672 spin_unlock_irqrestore(&idr_lock, flags);
1673
1674 free_mad(query);
1675 ib_sa_client_put(query->client);
1676 query->release(query);
1677 }
1678
1679 static void recv_handler(struct ib_mad_agent *mad_agent,
1680 struct ib_mad_send_buf *send_buf,
1681 struct ib_mad_recv_wc *mad_recv_wc)
1682 {
1683 struct ib_sa_query *query;
1684
1685 if (!send_buf)
1686 return;
1687
1688 query = send_buf->context[0];
1689 if (query->callback) {
1690 if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
1691 query->callback(query,
1692 mad_recv_wc->recv_buf.mad->mad_hdr.status ?
1693 -EINVAL : 0,
1694 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
1695 else
1696 query->callback(query, -EIO, NULL);
1697 }
1698
1699 ib_free_recv_mad(mad_recv_wc);
1700 }
1701
1702 static void ib_sa_add_one(struct ib_device *device)
1703 {
1704 struct ib_sa_device *sa_dev;
1705 int s, e, i;
1706 int count = 0;
1707
1708 s = rdma_start_port(device);
1709 e = rdma_end_port(device);
1710
1711 sa_dev = kzalloc(sizeof *sa_dev +
1712 (e - s + 1) * sizeof (struct ib_sa_port),
1713 GFP_KERNEL);
1714 if (!sa_dev)
1715 return;
1716
1717 sa_dev->start_port = s;
1718 sa_dev->end_port = e;
1719
1720 for (i = 0; i <= e - s; ++i) {
1721 spin_lock_init(&sa_dev->port[i].ah_lock);
1722 if (!rdma_cap_ib_sa(device, i + 1))
1723 continue;
1724
1725 sa_dev->port[i].sm_ah = NULL;
1726 sa_dev->port[i].port_num = i + s;
1727
1728 sa_dev->port[i].agent =
1729 ib_register_mad_agent(device, i + s, IB_QPT_GSI,
1730 NULL, 0, send_handler,
1731 recv_handler, sa_dev, 0);
1732 if (IS_ERR(sa_dev->port[i].agent))
1733 goto err;
1734
1735 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah);
1736
1737 count++;
1738 }
1739
1740 if (!count)
1741 goto free;
1742
1743 ib_set_client_data(device, &sa_client, sa_dev);
1744
1745 /*
1746 * We register our event handler after everything is set up,
1747 * and then update our cached info after the event handler is
1748 * registered to avoid any problems if a port changes state
1749 * during our initialization.
1750 */
1751
1752 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
1753 if (ib_register_event_handler(&sa_dev->event_handler))
1754 goto err;
1755
1756 for (i = 0; i <= e - s; ++i) {
1757 if (rdma_cap_ib_sa(device, i + 1))
1758 update_sm_ah(&sa_dev->port[i].update_task);
1759 }
1760
1761 return;
1762
1763 err:
1764 while (--i >= 0) {
1765 if (rdma_cap_ib_sa(device, i + 1))
1766 ib_unregister_mad_agent(sa_dev->port[i].agent);
1767 }
1768 free:
1769 kfree(sa_dev);
1770 return;
1771 }
1772
1773 static void ib_sa_remove_one(struct ib_device *device, void *client_data)
1774 {
1775 struct ib_sa_device *sa_dev = client_data;
1776 int i;
1777
1778 if (!sa_dev)
1779 return;
1780
1781 ib_unregister_event_handler(&sa_dev->event_handler);
1782
1783 flush_workqueue(ib_wq);
1784
1785 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
1786 if (rdma_cap_ib_sa(device, i + 1)) {
1787 ib_unregister_mad_agent(sa_dev->port[i].agent);
1788 if (sa_dev->port[i].sm_ah)
1789 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
1790 }
1791
1792 }
1793
1794 kfree(sa_dev);
1795 }
1796
1797 static int __init ib_sa_init(void)
1798 {
1799 int ret;
1800
1801 get_random_bytes(&tid, sizeof tid);
1802
1803 atomic_set(&ib_nl_sa_request_seq, 0);
1804
1805 ret = ib_register_client(&sa_client);
1806 if (ret) {
1807 pr_err("Couldn't register ib_sa client\n");
1808 goto err1;
1809 }
1810
1811 ret = mcast_init();
1812 if (ret) {
1813 pr_err("Couldn't initialize multicast handling\n");
1814 goto err2;
1815 }
1816
1817 ib_nl_wq = create_singlethread_workqueue("ib_nl_sa_wq");
1818 if (!ib_nl_wq) {
1819 ret = -ENOMEM;
1820 goto err3;
1821 }
1822
1823 if (ibnl_add_client(RDMA_NL_LS, ARRAY_SIZE(ib_sa_cb_table),
1824 ib_sa_cb_table)) {
1825 pr_err("Failed to add netlink callback\n");
1826 ret = -EINVAL;
1827 goto err4;
1828 }
1829 INIT_DELAYED_WORK(&ib_nl_timed_work, ib_nl_request_timeout);
1830
1831 return 0;
1832 err4:
1833 destroy_workqueue(ib_nl_wq);
1834 err3:
1835 mcast_cleanup();
1836 err2:
1837 ib_unregister_client(&sa_client);
1838 err1:
1839 return ret;
1840 }
1841
1842 static void __exit ib_sa_cleanup(void)
1843 {
1844 ibnl_remove_client(RDMA_NL_LS);
1845 cancel_delayed_work(&ib_nl_timed_work);
1846 flush_workqueue(ib_nl_wq);
1847 destroy_workqueue(ib_nl_wq);
1848 mcast_cleanup();
1849 ib_unregister_client(&sa_client);
1850 idr_destroy(&query_idr);
1851 }
1852
1853 module_init(ib_sa_init);
1854 module_exit(ib_sa_cleanup);
Linux kernel - Deliverables
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