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Merge remote-tracking branches 'asoc/topic/atmel', 'asoc/topic/bcm2835' and 'asoc...
[mirror_ubuntu-zesty-kernel.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 (!(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 printk(KERN_WARNING "Couldn't query port\n");
868 return;
869 }
870
871 new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL);
872 if (!new_ah) {
873 printk(KERN_WARNING "Couldn't allocate new SM AH\n");
874 return;
875 }
876
877 kref_init(&new_ah->ref);
878 new_ah->src_path_mask = (1 << port_attr.lmc) - 1;
879
880 new_ah->pkey_index = 0;
881 if (ib_find_pkey(port->agent->device, port->port_num,
882 IB_DEFAULT_PKEY_FULL, &new_ah->pkey_index))
883 printk(KERN_ERR "Couldn't find index for default PKey\n");
884
885 memset(&ah_attr, 0, sizeof ah_attr);
886 ah_attr.dlid = port_attr.sm_lid;
887 ah_attr.sl = port_attr.sm_sl;
888 ah_attr.port_num = port->port_num;
889
890 new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr);
891 if (IS_ERR(new_ah->ah)) {
892 printk(KERN_WARNING "Couldn't create new SM AH\n");
893 kfree(new_ah);
894 return;
895 }
896
897 spin_lock_irq(&port->ah_lock);
898 if (port->sm_ah)
899 kref_put(&port->sm_ah->ref, free_sm_ah);
900 port->sm_ah = new_ah;
901 spin_unlock_irq(&port->ah_lock);
902
903 }
904
905 static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event)
906 {
907 if (event->event == IB_EVENT_PORT_ERR ||
908 event->event == IB_EVENT_PORT_ACTIVE ||
909 event->event == IB_EVENT_LID_CHANGE ||
910 event->event == IB_EVENT_PKEY_CHANGE ||
911 event->event == IB_EVENT_SM_CHANGE ||
912 event->event == IB_EVENT_CLIENT_REREGISTER) {
913 unsigned long flags;
914 struct ib_sa_device *sa_dev =
915 container_of(handler, typeof(*sa_dev), event_handler);
916 struct ib_sa_port *port =
917 &sa_dev->port[event->element.port_num - sa_dev->start_port];
918
919 if (!rdma_cap_ib_sa(handler->device, port->port_num))
920 return;
921
922 spin_lock_irqsave(&port->ah_lock, flags);
923 if (port->sm_ah)
924 kref_put(&port->sm_ah->ref, free_sm_ah);
925 port->sm_ah = NULL;
926 spin_unlock_irqrestore(&port->ah_lock, flags);
927
928 queue_work(ib_wq, &sa_dev->port[event->element.port_num -
929 sa_dev->start_port].update_task);
930 }
931 }
932
933 void ib_sa_register_client(struct ib_sa_client *client)
934 {
935 atomic_set(&client->users, 1);
936 init_completion(&client->comp);
937 }
938 EXPORT_SYMBOL(ib_sa_register_client);
939
940 void ib_sa_unregister_client(struct ib_sa_client *client)
941 {
942 ib_sa_client_put(client);
943 wait_for_completion(&client->comp);
944 }
945 EXPORT_SYMBOL(ib_sa_unregister_client);
946
947 /**
948 * ib_sa_cancel_query - try to cancel an SA query
949 * @id:ID of query to cancel
950 * @query:query pointer to cancel
951 *
952 * Try to cancel an SA query. If the id and query don't match up or
953 * the query has already completed, nothing is done. Otherwise the
954 * query is canceled and will complete with a status of -EINTR.
955 */
956 void ib_sa_cancel_query(int id, struct ib_sa_query *query)
957 {
958 unsigned long flags;
959 struct ib_mad_agent *agent;
960 struct ib_mad_send_buf *mad_buf;
961
962 spin_lock_irqsave(&idr_lock, flags);
963 if (idr_find(&query_idr, id) != query) {
964 spin_unlock_irqrestore(&idr_lock, flags);
965 return;
966 }
967 agent = query->port->agent;
968 mad_buf = query->mad_buf;
969 spin_unlock_irqrestore(&idr_lock, flags);
970
971 /*
972 * If the query is still on the netlink request list, schedule
973 * it to be cancelled by the timeout routine. Otherwise, it has been
974 * sent to the MAD layer and has to be cancelled from there.
975 */
976 if (!ib_nl_cancel_request(query))
977 ib_cancel_mad(agent, mad_buf);
978 }
979 EXPORT_SYMBOL(ib_sa_cancel_query);
980
981 static u8 get_src_path_mask(struct ib_device *device, u8 port_num)
982 {
983 struct ib_sa_device *sa_dev;
984 struct ib_sa_port *port;
985 unsigned long flags;
986 u8 src_path_mask;
987
988 sa_dev = ib_get_client_data(device, &sa_client);
989 if (!sa_dev)
990 return 0x7f;
991
992 port = &sa_dev->port[port_num - sa_dev->start_port];
993 spin_lock_irqsave(&port->ah_lock, flags);
994 src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f;
995 spin_unlock_irqrestore(&port->ah_lock, flags);
996
997 return src_path_mask;
998 }
999
1000 int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
1001 struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr)
1002 {
1003 int ret;
1004 u16 gid_index;
1005 int use_roce;
1006 struct net_device *ndev = NULL;
1007
1008 memset(ah_attr, 0, sizeof *ah_attr);
1009 ah_attr->dlid = be16_to_cpu(rec->dlid);
1010 ah_attr->sl = rec->sl;
1011 ah_attr->src_path_bits = be16_to_cpu(rec->slid) &
1012 get_src_path_mask(device, port_num);
1013 ah_attr->port_num = port_num;
1014 ah_attr->static_rate = rec->rate;
1015
1016 use_roce = rdma_cap_eth_ah(device, port_num);
1017
1018 if (use_roce) {
1019 struct net_device *idev;
1020 struct net_device *resolved_dev;
1021 struct rdma_dev_addr dev_addr = {.bound_dev_if = rec->ifindex,
1022 .net = rec->net ? rec->net :
1023 &init_net};
1024 union {
1025 struct sockaddr _sockaddr;
1026 struct sockaddr_in _sockaddr_in;
1027 struct sockaddr_in6 _sockaddr_in6;
1028 } sgid_addr, dgid_addr;
1029
1030 if (!device->get_netdev)
1031 return -EOPNOTSUPP;
1032
1033 rdma_gid2ip(&sgid_addr._sockaddr, &rec->sgid);
1034 rdma_gid2ip(&dgid_addr._sockaddr, &rec->dgid);
1035
1036 /* validate the route */
1037 ret = rdma_resolve_ip_route(&sgid_addr._sockaddr,
1038 &dgid_addr._sockaddr, &dev_addr);
1039 if (ret)
1040 return ret;
1041
1042 if ((dev_addr.network == RDMA_NETWORK_IPV4 ||
1043 dev_addr.network == RDMA_NETWORK_IPV6) &&
1044 rec->gid_type != IB_GID_TYPE_ROCE_UDP_ENCAP)
1045 return -EINVAL;
1046
1047 idev = device->get_netdev(device, port_num);
1048 if (!idev)
1049 return -ENODEV;
1050
1051 resolved_dev = dev_get_by_index(dev_addr.net,
1052 dev_addr.bound_dev_if);
1053 if (resolved_dev->flags & IFF_LOOPBACK) {
1054 dev_put(resolved_dev);
1055 resolved_dev = idev;
1056 dev_hold(resolved_dev);
1057 }
1058 ndev = ib_get_ndev_from_path(rec);
1059 rcu_read_lock();
1060 if ((ndev && ndev != resolved_dev) ||
1061 (resolved_dev != idev &&
1062 !rdma_is_upper_dev_rcu(idev, resolved_dev)))
1063 ret = -EHOSTUNREACH;
1064 rcu_read_unlock();
1065 dev_put(idev);
1066 dev_put(resolved_dev);
1067 if (ret) {
1068 if (ndev)
1069 dev_put(ndev);
1070 return ret;
1071 }
1072 }
1073
1074 if (rec->hop_limit > 0 || use_roce) {
1075 ah_attr->ah_flags = IB_AH_GRH;
1076 ah_attr->grh.dgid = rec->dgid;
1077
1078 ret = ib_find_cached_gid_by_port(device, &rec->sgid,
1079 rec->gid_type, port_num, ndev,
1080 &gid_index);
1081 if (ret) {
1082 if (ndev)
1083 dev_put(ndev);
1084 return ret;
1085 }
1086
1087 ah_attr->grh.sgid_index = gid_index;
1088 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
1089 ah_attr->grh.hop_limit = rec->hop_limit;
1090 ah_attr->grh.traffic_class = rec->traffic_class;
1091 if (ndev)
1092 dev_put(ndev);
1093 }
1094
1095 if (use_roce)
1096 memcpy(ah_attr->dmac, rec->dmac, ETH_ALEN);
1097
1098 return 0;
1099 }
1100 EXPORT_SYMBOL(ib_init_ah_from_path);
1101
1102 static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask)
1103 {
1104 unsigned long flags;
1105
1106 spin_lock_irqsave(&query->port->ah_lock, flags);
1107 if (!query->port->sm_ah) {
1108 spin_unlock_irqrestore(&query->port->ah_lock, flags);
1109 return -EAGAIN;
1110 }
1111 kref_get(&query->port->sm_ah->ref);
1112 query->sm_ah = query->port->sm_ah;
1113 spin_unlock_irqrestore(&query->port->ah_lock, flags);
1114
1115 query->mad_buf = ib_create_send_mad(query->port->agent, 1,
1116 query->sm_ah->pkey_index,
1117 0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA,
1118 gfp_mask,
1119 IB_MGMT_BASE_VERSION);
1120 if (IS_ERR(query->mad_buf)) {
1121 kref_put(&query->sm_ah->ref, free_sm_ah);
1122 return -ENOMEM;
1123 }
1124
1125 query->mad_buf->ah = query->sm_ah->ah;
1126
1127 return 0;
1128 }
1129
1130 static void free_mad(struct ib_sa_query *query)
1131 {
1132 ib_free_send_mad(query->mad_buf);
1133 kref_put(&query->sm_ah->ref, free_sm_ah);
1134 }
1135
1136 static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
1137 {
1138 unsigned long flags;
1139
1140 memset(mad, 0, sizeof *mad);
1141
1142 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION;
1143 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
1144 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
1145
1146 spin_lock_irqsave(&tid_lock, flags);
1147 mad->mad_hdr.tid =
1148 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
1149 spin_unlock_irqrestore(&tid_lock, flags);
1150 }
1151
1152 static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask)
1153 {
1154 bool preload = gfpflags_allow_blocking(gfp_mask);
1155 unsigned long flags;
1156 int ret, id;
1157
1158 if (preload)
1159 idr_preload(gfp_mask);
1160 spin_lock_irqsave(&idr_lock, flags);
1161
1162 id = idr_alloc(&query_idr, query, 0, 0, GFP_NOWAIT);
1163
1164 spin_unlock_irqrestore(&idr_lock, flags);
1165 if (preload)
1166 idr_preload_end();
1167 if (id < 0)
1168 return id;
1169
1170 query->mad_buf->timeout_ms = timeout_ms;
1171 query->mad_buf->context[0] = query;
1172 query->id = id;
1173
1174 if (query->flags & IB_SA_ENABLE_LOCAL_SERVICE) {
1175 if (!ibnl_chk_listeners(RDMA_NL_GROUP_LS)) {
1176 if (!ib_nl_make_request(query, gfp_mask))
1177 return id;
1178 }
1179 ib_sa_disable_local_svc(query);
1180 }
1181
1182 ret = ib_post_send_mad(query->mad_buf, NULL);
1183 if (ret) {
1184 spin_lock_irqsave(&idr_lock, flags);
1185 idr_remove(&query_idr, id);
1186 spin_unlock_irqrestore(&idr_lock, flags);
1187 }
1188
1189 /*
1190 * It's not safe to dereference query any more, because the
1191 * send may already have completed and freed the query in
1192 * another context.
1193 */
1194 return ret ? ret : id;
1195 }
1196
1197 void ib_sa_unpack_path(void *attribute, struct ib_sa_path_rec *rec)
1198 {
1199 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), attribute, rec);
1200 }
1201 EXPORT_SYMBOL(ib_sa_unpack_path);
1202
1203 void ib_sa_pack_path(struct ib_sa_path_rec *rec, void *attribute)
1204 {
1205 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, attribute);
1206 }
1207 EXPORT_SYMBOL(ib_sa_pack_path);
1208
1209 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
1210 int status,
1211 struct ib_sa_mad *mad)
1212 {
1213 struct ib_sa_path_query *query =
1214 container_of(sa_query, struct ib_sa_path_query, sa_query);
1215
1216 if (mad) {
1217 struct ib_sa_path_rec rec;
1218
1219 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
1220 mad->data, &rec);
1221 rec.net = NULL;
1222 rec.ifindex = 0;
1223 rec.gid_type = IB_GID_TYPE_IB;
1224 memset(rec.dmac, 0, ETH_ALEN);
1225 query->callback(status, &rec, query->context);
1226 } else
1227 query->callback(status, NULL, query->context);
1228 }
1229
1230 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
1231 {
1232 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query));
1233 }
1234
1235 /**
1236 * ib_sa_path_rec_get - Start a Path get query
1237 * @client:SA client
1238 * @device:device to send query on
1239 * @port_num: port number to send query on
1240 * @rec:Path Record to send in query
1241 * @comp_mask:component mask to send in query
1242 * @timeout_ms:time to wait for response
1243 * @gfp_mask:GFP mask to use for internal allocations
1244 * @callback:function called when query completes, times out or is
1245 * canceled
1246 * @context:opaque user context passed to callback
1247 * @sa_query:query context, used to cancel query
1248 *
1249 * Send a Path Record Get query to the SA to look up a path. The
1250 * callback function will be called when the query completes (or
1251 * fails); status is 0 for a successful response, -EINTR if the query
1252 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
1253 * occurred sending the query. The resp parameter of the callback is
1254 * only valid if status is 0.
1255 *
1256 * If the return value of ib_sa_path_rec_get() is negative, it is an
1257 * error code. Otherwise it is a query ID that can be used to cancel
1258 * the query.
1259 */
1260 int ib_sa_path_rec_get(struct ib_sa_client *client,
1261 struct ib_device *device, u8 port_num,
1262 struct ib_sa_path_rec *rec,
1263 ib_sa_comp_mask comp_mask,
1264 int timeout_ms, gfp_t gfp_mask,
1265 void (*callback)(int status,
1266 struct ib_sa_path_rec *resp,
1267 void *context),
1268 void *context,
1269 struct ib_sa_query **sa_query)
1270 {
1271 struct ib_sa_path_query *query;
1272 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1273 struct ib_sa_port *port;
1274 struct ib_mad_agent *agent;
1275 struct ib_sa_mad *mad;
1276 int ret;
1277
1278 if (!sa_dev)
1279 return -ENODEV;
1280
1281 port = &sa_dev->port[port_num - sa_dev->start_port];
1282 agent = port->agent;
1283
1284 query = kzalloc(sizeof(*query), gfp_mask);
1285 if (!query)
1286 return -ENOMEM;
1287
1288 query->sa_query.port = port;
1289 ret = alloc_mad(&query->sa_query, gfp_mask);
1290 if (ret)
1291 goto err1;
1292
1293 ib_sa_client_get(client);
1294 query->sa_query.client = client;
1295 query->callback = callback;
1296 query->context = context;
1297
1298 mad = query->sa_query.mad_buf->mad;
1299 init_mad(mad, agent);
1300
1301 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
1302 query->sa_query.release = ib_sa_path_rec_release;
1303 mad->mad_hdr.method = IB_MGMT_METHOD_GET;
1304 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC);
1305 mad->sa_hdr.comp_mask = comp_mask;
1306
1307 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data);
1308
1309 *sa_query = &query->sa_query;
1310
1311 query->sa_query.flags |= IB_SA_ENABLE_LOCAL_SERVICE;
1312 query->sa_query.mad_buf->context[1] = rec;
1313
1314 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1315 if (ret < 0)
1316 goto err2;
1317
1318 return ret;
1319
1320 err2:
1321 *sa_query = NULL;
1322 ib_sa_client_put(query->sa_query.client);
1323 free_mad(&query->sa_query);
1324
1325 err1:
1326 kfree(query);
1327 return ret;
1328 }
1329 EXPORT_SYMBOL(ib_sa_path_rec_get);
1330
1331 static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query,
1332 int status,
1333 struct ib_sa_mad *mad)
1334 {
1335 struct ib_sa_service_query *query =
1336 container_of(sa_query, struct ib_sa_service_query, sa_query);
1337
1338 if (mad) {
1339 struct ib_sa_service_rec rec;
1340
1341 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table),
1342 mad->data, &rec);
1343 query->callback(status, &rec, query->context);
1344 } else
1345 query->callback(status, NULL, query->context);
1346 }
1347
1348 static void ib_sa_service_rec_release(struct ib_sa_query *sa_query)
1349 {
1350 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query));
1351 }
1352
1353 /**
1354 * ib_sa_service_rec_query - Start Service Record operation
1355 * @client:SA client
1356 * @device:device to send request on
1357 * @port_num: port number to send request on
1358 * @method:SA method - should be get, set, or delete
1359 * @rec:Service Record to send in request
1360 * @comp_mask:component mask to send in request
1361 * @timeout_ms:time to wait for response
1362 * @gfp_mask:GFP mask to use for internal allocations
1363 * @callback:function called when request completes, times out or is
1364 * canceled
1365 * @context:opaque user context passed to callback
1366 * @sa_query:request context, used to cancel request
1367 *
1368 * Send a Service Record set/get/delete to the SA to register,
1369 * unregister or query a service record.
1370 * The callback function will be called when the request completes (or
1371 * fails); status is 0 for a successful response, -EINTR if the query
1372 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
1373 * occurred sending the query. The resp parameter of the callback is
1374 * only valid if status is 0.
1375 *
1376 * If the return value of ib_sa_service_rec_query() is negative, it is an
1377 * error code. Otherwise it is a request ID that can be used to cancel
1378 * the query.
1379 */
1380 int ib_sa_service_rec_query(struct ib_sa_client *client,
1381 struct ib_device *device, u8 port_num, u8 method,
1382 struct ib_sa_service_rec *rec,
1383 ib_sa_comp_mask comp_mask,
1384 int timeout_ms, gfp_t gfp_mask,
1385 void (*callback)(int status,
1386 struct ib_sa_service_rec *resp,
1387 void *context),
1388 void *context,
1389 struct ib_sa_query **sa_query)
1390 {
1391 struct ib_sa_service_query *query;
1392 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1393 struct ib_sa_port *port;
1394 struct ib_mad_agent *agent;
1395 struct ib_sa_mad *mad;
1396 int ret;
1397
1398 if (!sa_dev)
1399 return -ENODEV;
1400
1401 port = &sa_dev->port[port_num - sa_dev->start_port];
1402 agent = port->agent;
1403
1404 if (method != IB_MGMT_METHOD_GET &&
1405 method != IB_MGMT_METHOD_SET &&
1406 method != IB_SA_METHOD_DELETE)
1407 return -EINVAL;
1408
1409 query = kzalloc(sizeof(*query), gfp_mask);
1410 if (!query)
1411 return -ENOMEM;
1412
1413 query->sa_query.port = port;
1414 ret = alloc_mad(&query->sa_query, gfp_mask);
1415 if (ret)
1416 goto err1;
1417
1418 ib_sa_client_get(client);
1419 query->sa_query.client = client;
1420 query->callback = callback;
1421 query->context = context;
1422
1423 mad = query->sa_query.mad_buf->mad;
1424 init_mad(mad, agent);
1425
1426 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
1427 query->sa_query.release = ib_sa_service_rec_release;
1428 mad->mad_hdr.method = method;
1429 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
1430 mad->sa_hdr.comp_mask = comp_mask;
1431
1432 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table),
1433 rec, mad->data);
1434
1435 *sa_query = &query->sa_query;
1436
1437 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1438 if (ret < 0)
1439 goto err2;
1440
1441 return ret;
1442
1443 err2:
1444 *sa_query = NULL;
1445 ib_sa_client_put(query->sa_query.client);
1446 free_mad(&query->sa_query);
1447
1448 err1:
1449 kfree(query);
1450 return ret;
1451 }
1452 EXPORT_SYMBOL(ib_sa_service_rec_query);
1453
1454 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
1455 int status,
1456 struct ib_sa_mad *mad)
1457 {
1458 struct ib_sa_mcmember_query *query =
1459 container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
1460
1461 if (mad) {
1462 struct ib_sa_mcmember_rec rec;
1463
1464 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
1465 mad->data, &rec);
1466 query->callback(status, &rec, query->context);
1467 } else
1468 query->callback(status, NULL, query->context);
1469 }
1470
1471 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
1472 {
1473 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
1474 }
1475
1476 int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
1477 struct ib_device *device, u8 port_num,
1478 u8 method,
1479 struct ib_sa_mcmember_rec *rec,
1480 ib_sa_comp_mask comp_mask,
1481 int timeout_ms, gfp_t gfp_mask,
1482 void (*callback)(int status,
1483 struct ib_sa_mcmember_rec *resp,
1484 void *context),
1485 void *context,
1486 struct ib_sa_query **sa_query)
1487 {
1488 struct ib_sa_mcmember_query *query;
1489 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1490 struct ib_sa_port *port;
1491 struct ib_mad_agent *agent;
1492 struct ib_sa_mad *mad;
1493 int ret;
1494
1495 if (!sa_dev)
1496 return -ENODEV;
1497
1498 port = &sa_dev->port[port_num - sa_dev->start_port];
1499 agent = port->agent;
1500
1501 query = kzalloc(sizeof(*query), gfp_mask);
1502 if (!query)
1503 return -ENOMEM;
1504
1505 query->sa_query.port = port;
1506 ret = alloc_mad(&query->sa_query, gfp_mask);
1507 if (ret)
1508 goto err1;
1509
1510 ib_sa_client_get(client);
1511 query->sa_query.client = client;
1512 query->callback = callback;
1513 query->context = context;
1514
1515 mad = query->sa_query.mad_buf->mad;
1516 init_mad(mad, agent);
1517
1518 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
1519 query->sa_query.release = ib_sa_mcmember_rec_release;
1520 mad->mad_hdr.method = method;
1521 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
1522 mad->sa_hdr.comp_mask = comp_mask;
1523
1524 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
1525 rec, mad->data);
1526
1527 *sa_query = &query->sa_query;
1528
1529 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1530 if (ret < 0)
1531 goto err2;
1532
1533 return ret;
1534
1535 err2:
1536 *sa_query = NULL;
1537 ib_sa_client_put(query->sa_query.client);
1538 free_mad(&query->sa_query);
1539
1540 err1:
1541 kfree(query);
1542 return ret;
1543 }
1544
1545 /* Support GuidInfoRecord */
1546 static void ib_sa_guidinfo_rec_callback(struct ib_sa_query *sa_query,
1547 int status,
1548 struct ib_sa_mad *mad)
1549 {
1550 struct ib_sa_guidinfo_query *query =
1551 container_of(sa_query, struct ib_sa_guidinfo_query, sa_query);
1552
1553 if (mad) {
1554 struct ib_sa_guidinfo_rec rec;
1555
1556 ib_unpack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table),
1557 mad->data, &rec);
1558 query->callback(status, &rec, query->context);
1559 } else
1560 query->callback(status, NULL, query->context);
1561 }
1562
1563 static void ib_sa_guidinfo_rec_release(struct ib_sa_query *sa_query)
1564 {
1565 kfree(container_of(sa_query, struct ib_sa_guidinfo_query, sa_query));
1566 }
1567
1568 int ib_sa_guid_info_rec_query(struct ib_sa_client *client,
1569 struct ib_device *device, u8 port_num,
1570 struct ib_sa_guidinfo_rec *rec,
1571 ib_sa_comp_mask comp_mask, u8 method,
1572 int timeout_ms, gfp_t gfp_mask,
1573 void (*callback)(int status,
1574 struct ib_sa_guidinfo_rec *resp,
1575 void *context),
1576 void *context,
1577 struct ib_sa_query **sa_query)
1578 {
1579 struct ib_sa_guidinfo_query *query;
1580 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1581 struct ib_sa_port *port;
1582 struct ib_mad_agent *agent;
1583 struct ib_sa_mad *mad;
1584 int ret;
1585
1586 if (!sa_dev)
1587 return -ENODEV;
1588
1589 if (method != IB_MGMT_METHOD_GET &&
1590 method != IB_MGMT_METHOD_SET &&
1591 method != IB_SA_METHOD_DELETE) {
1592 return -EINVAL;
1593 }
1594
1595 port = &sa_dev->port[port_num - sa_dev->start_port];
1596 agent = port->agent;
1597
1598 query = kzalloc(sizeof(*query), gfp_mask);
1599 if (!query)
1600 return -ENOMEM;
1601
1602 query->sa_query.port = port;
1603 ret = alloc_mad(&query->sa_query, gfp_mask);
1604 if (ret)
1605 goto err1;
1606
1607 ib_sa_client_get(client);
1608 query->sa_query.client = client;
1609 query->callback = callback;
1610 query->context = context;
1611
1612 mad = query->sa_query.mad_buf->mad;
1613 init_mad(mad, agent);
1614
1615 query->sa_query.callback = callback ? ib_sa_guidinfo_rec_callback : NULL;
1616 query->sa_query.release = ib_sa_guidinfo_rec_release;
1617
1618 mad->mad_hdr.method = method;
1619 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_GUID_INFO_REC);
1620 mad->sa_hdr.comp_mask = comp_mask;
1621
1622 ib_pack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table), rec,
1623 mad->data);
1624
1625 *sa_query = &query->sa_query;
1626
1627 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1628 if (ret < 0)
1629 goto err2;
1630
1631 return ret;
1632
1633 err2:
1634 *sa_query = NULL;
1635 ib_sa_client_put(query->sa_query.client);
1636 free_mad(&query->sa_query);
1637
1638 err1:
1639 kfree(query);
1640 return ret;
1641 }
1642 EXPORT_SYMBOL(ib_sa_guid_info_rec_query);
1643
1644 static void send_handler(struct ib_mad_agent *agent,
1645 struct ib_mad_send_wc *mad_send_wc)
1646 {
1647 struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
1648 unsigned long flags;
1649
1650 if (query->callback)
1651 switch (mad_send_wc->status) {
1652 case IB_WC_SUCCESS:
1653 /* No callback -- already got recv */
1654 break;
1655 case IB_WC_RESP_TIMEOUT_ERR:
1656 query->callback(query, -ETIMEDOUT, NULL);
1657 break;
1658 case IB_WC_WR_FLUSH_ERR:
1659 query->callback(query, -EINTR, NULL);
1660 break;
1661 default:
1662 query->callback(query, -EIO, NULL);
1663 break;
1664 }
1665
1666 spin_lock_irqsave(&idr_lock, flags);
1667 idr_remove(&query_idr, query->id);
1668 spin_unlock_irqrestore(&idr_lock, flags);
1669
1670 free_mad(query);
1671 ib_sa_client_put(query->client);
1672 query->release(query);
1673 }
1674
1675 static void recv_handler(struct ib_mad_agent *mad_agent,
1676 struct ib_mad_send_buf *send_buf,
1677 struct ib_mad_recv_wc *mad_recv_wc)
1678 {
1679 struct ib_sa_query *query;
1680
1681 if (!send_buf)
1682 return;
1683
1684 query = send_buf->context[0];
1685 if (query->callback) {
1686 if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
1687 query->callback(query,
1688 mad_recv_wc->recv_buf.mad->mad_hdr.status ?
1689 -EINVAL : 0,
1690 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
1691 else
1692 query->callback(query, -EIO, NULL);
1693 }
1694
1695 ib_free_recv_mad(mad_recv_wc);
1696 }
1697
1698 static void ib_sa_add_one(struct ib_device *device)
1699 {
1700 struct ib_sa_device *sa_dev;
1701 int s, e, i;
1702 int count = 0;
1703
1704 s = rdma_start_port(device);
1705 e = rdma_end_port(device);
1706
1707 sa_dev = kzalloc(sizeof *sa_dev +
1708 (e - s + 1) * sizeof (struct ib_sa_port),
1709 GFP_KERNEL);
1710 if (!sa_dev)
1711 return;
1712
1713 sa_dev->start_port = s;
1714 sa_dev->end_port = e;
1715
1716 for (i = 0; i <= e - s; ++i) {
1717 spin_lock_init(&sa_dev->port[i].ah_lock);
1718 if (!rdma_cap_ib_sa(device, i + 1))
1719 continue;
1720
1721 sa_dev->port[i].sm_ah = NULL;
1722 sa_dev->port[i].port_num = i + s;
1723
1724 sa_dev->port[i].agent =
1725 ib_register_mad_agent(device, i + s, IB_QPT_GSI,
1726 NULL, 0, send_handler,
1727 recv_handler, sa_dev, 0);
1728 if (IS_ERR(sa_dev->port[i].agent))
1729 goto err;
1730
1731 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah);
1732
1733 count++;
1734 }
1735
1736 if (!count)
1737 goto free;
1738
1739 ib_set_client_data(device, &sa_client, sa_dev);
1740
1741 /*
1742 * We register our event handler after everything is set up,
1743 * and then update our cached info after the event handler is
1744 * registered to avoid any problems if a port changes state
1745 * during our initialization.
1746 */
1747
1748 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
1749 if (ib_register_event_handler(&sa_dev->event_handler))
1750 goto err;
1751
1752 for (i = 0; i <= e - s; ++i) {
1753 if (rdma_cap_ib_sa(device, i + 1))
1754 update_sm_ah(&sa_dev->port[i].update_task);
1755 }
1756
1757 return;
1758
1759 err:
1760 while (--i >= 0) {
1761 if (rdma_cap_ib_sa(device, i + 1))
1762 ib_unregister_mad_agent(sa_dev->port[i].agent);
1763 }
1764 free:
1765 kfree(sa_dev);
1766 return;
1767 }
1768
1769 static void ib_sa_remove_one(struct ib_device *device, void *client_data)
1770 {
1771 struct ib_sa_device *sa_dev = client_data;
1772 int i;
1773
1774 if (!sa_dev)
1775 return;
1776
1777 ib_unregister_event_handler(&sa_dev->event_handler);
1778
1779 flush_workqueue(ib_wq);
1780
1781 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
1782 if (rdma_cap_ib_sa(device, i + 1)) {
1783 ib_unregister_mad_agent(sa_dev->port[i].agent);
1784 if (sa_dev->port[i].sm_ah)
1785 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
1786 }
1787
1788 }
1789
1790 kfree(sa_dev);
1791 }
1792
1793 static int __init ib_sa_init(void)
1794 {
1795 int ret;
1796
1797 get_random_bytes(&tid, sizeof tid);
1798
1799 atomic_set(&ib_nl_sa_request_seq, 0);
1800
1801 ret = ib_register_client(&sa_client);
1802 if (ret) {
1803 printk(KERN_ERR "Couldn't register ib_sa client\n");
1804 goto err1;
1805 }
1806
1807 ret = mcast_init();
1808 if (ret) {
1809 printk(KERN_ERR "Couldn't initialize multicast handling\n");
1810 goto err2;
1811 }
1812
1813 ib_nl_wq = create_singlethread_workqueue("ib_nl_sa_wq");
1814 if (!ib_nl_wq) {
1815 ret = -ENOMEM;
1816 goto err3;
1817 }
1818
1819 if (ibnl_add_client(RDMA_NL_LS, RDMA_NL_LS_NUM_OPS,
1820 ib_sa_cb_table)) {
1821 pr_err("Failed to add netlink callback\n");
1822 ret = -EINVAL;
1823 goto err4;
1824 }
1825 INIT_DELAYED_WORK(&ib_nl_timed_work, ib_nl_request_timeout);
1826
1827 return 0;
1828 err4:
1829 destroy_workqueue(ib_nl_wq);
1830 err3:
1831 mcast_cleanup();
1832 err2:
1833 ib_unregister_client(&sa_client);
1834 err1:
1835 return ret;
1836 }
1837
1838 static void __exit ib_sa_cleanup(void)
1839 {
1840 ibnl_remove_client(RDMA_NL_LS);
1841 cancel_delayed_work(&ib_nl_timed_work);
1842 flush_workqueue(ib_nl_wq);
1843 destroy_workqueue(ib_nl_wq);
1844 mcast_cleanup();
1845 ib_unregister_client(&sa_client);
1846 idr_destroy(&query_idr);
1847 }
1848
1849 module_init(ib_sa_init);
1850 module_exit(ib_sa_cleanup);
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