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/init.h>
36 #include <linux/err.h>
37 #include <linux/random.h>
38 #include <linux/spinlock.h>
39 #include <linux/slab.h>
40 #include <linux/dma-mapping.h>
41 #include <linux/kref.h>
42 #include <linux/xarray.h>
43 #include <linux/workqueue.h>
44 #include <uapi/linux/if_ether.h>
45 #include <rdma/ib_pack.h>
46 #include <rdma/ib_cache.h>
47 #include <rdma/rdma_netlink.h>
48 #include <net/netlink.h>
49 #include <uapi/rdma/ib_user_sa.h>
50 #include <rdma/ib_marshall.h>
51 #include <rdma/ib_addr.h>
52 #include <rdma/opa_addr.h>
53 #include <rdma/rdma_cm.h>
54 #include "sa.h"
55 #include "core_priv.h"
56
57 #define IB_SA_LOCAL_SVC_TIMEOUT_MIN 100
58 #define IB_SA_LOCAL_SVC_TIMEOUT_DEFAULT 2000
59 #define IB_SA_LOCAL_SVC_TIMEOUT_MAX 200000
60 #define IB_SA_CPI_MAX_RETRY_CNT 3
61 #define IB_SA_CPI_RETRY_WAIT 1000 /*msecs */
62 static int sa_local_svc_timeout_ms = IB_SA_LOCAL_SVC_TIMEOUT_DEFAULT;
63
64 struct ib_sa_sm_ah {
65 struct ib_ah *ah;
66 struct kref ref;
67 u16 pkey_index;
68 u8 src_path_mask;
69 };
70
71 enum rdma_class_port_info_type {
72 RDMA_CLASS_PORT_INFO_IB,
73 RDMA_CLASS_PORT_INFO_OPA
74 };
75
76 struct rdma_class_port_info {
77 enum rdma_class_port_info_type type;
78 union {
79 struct ib_class_port_info ib;
80 struct opa_class_port_info opa;
81 };
82 };
83
84 struct ib_sa_classport_cache {
85 bool valid;
86 int retry_cnt;
87 struct rdma_class_port_info data;
88 };
89
90 struct ib_sa_port {
91 struct ib_mad_agent *agent;
92 struct ib_sa_sm_ah *sm_ah;
93 struct work_struct update_task;
94 struct ib_sa_classport_cache classport_info;
95 struct delayed_work ib_cpi_work;
96 spinlock_t classport_lock; /* protects class port info set */
97 spinlock_t ah_lock;
98 u32 port_num;
99 };
100
101 struct ib_sa_device {
102 int start_port, end_port;
103 struct ib_event_handler event_handler;
104 struct ib_sa_port port[];
105 };
106
107 struct ib_sa_query {
108 void (*callback)(struct ib_sa_query *sa_query, int status,
109 struct ib_sa_mad *mad);
110 void (*release)(struct ib_sa_query *);
111 struct ib_sa_client *client;
112 struct ib_sa_port *port;
113 struct ib_mad_send_buf *mad_buf;
114 struct ib_sa_sm_ah *sm_ah;
115 int id;
116 u32 flags;
117 struct list_head list; /* Local svc request list */
118 u32 seq; /* Local svc request sequence number */
119 unsigned long timeout; /* Local svc timeout */
120 u8 path_use; /* How will the pathrecord be used */
121 };
122
123 #define IB_SA_ENABLE_LOCAL_SERVICE 0x00000001
124 #define IB_SA_CANCEL 0x00000002
125 #define IB_SA_QUERY_OPA 0x00000004
126
127 struct ib_sa_path_query {
128 void (*callback)(int status, struct sa_path_rec *rec,
129 unsigned int num_paths, void *context);
130 void *context;
131 struct ib_sa_query sa_query;
132 struct sa_path_rec *conv_pr;
133 };
134
135 struct ib_sa_guidinfo_query {
136 void (*callback)(int, struct ib_sa_guidinfo_rec *, void *);
137 void *context;
138 struct ib_sa_query sa_query;
139 };
140
141 struct ib_sa_classport_info_query {
142 void (*callback)(void *);
143 void *context;
144 struct ib_sa_query sa_query;
145 };
146
147 struct ib_sa_mcmember_query {
148 void (*callback)(int, struct ib_sa_mcmember_rec *, void *);
149 void *context;
150 struct ib_sa_query sa_query;
151 };
152
153 static LIST_HEAD(ib_nl_request_list);
154 static DEFINE_SPINLOCK(ib_nl_request_lock);
155 static atomic_t ib_nl_sa_request_seq;
156 static struct workqueue_struct *ib_nl_wq;
157 static struct delayed_work ib_nl_timed_work;
158 static const struct nla_policy ib_nl_policy[LS_NLA_TYPE_MAX] = {
159 [LS_NLA_TYPE_PATH_RECORD] = {.type = NLA_BINARY,
160 .len = sizeof(struct ib_path_rec_data)},
161 [LS_NLA_TYPE_TIMEOUT] = {.type = NLA_U32},
162 [LS_NLA_TYPE_SERVICE_ID] = {.type = NLA_U64},
163 [LS_NLA_TYPE_DGID] = {.type = NLA_BINARY,
164 .len = sizeof(struct rdma_nla_ls_gid)},
165 [LS_NLA_TYPE_SGID] = {.type = NLA_BINARY,
166 .len = sizeof(struct rdma_nla_ls_gid)},
167 [LS_NLA_TYPE_TCLASS] = {.type = NLA_U8},
168 [LS_NLA_TYPE_PKEY] = {.type = NLA_U16},
169 [LS_NLA_TYPE_QOS_CLASS] = {.type = NLA_U16},
170 };
171
172
173 static int ib_sa_add_one(struct ib_device *device);
174 static void ib_sa_remove_one(struct ib_device *device, void *client_data);
175
176 static struct ib_client sa_client = {
177 .name = "sa",
178 .add = ib_sa_add_one,
179 .remove = ib_sa_remove_one
180 };
181
182 static DEFINE_XARRAY_FLAGS(queries, XA_FLAGS_ALLOC | XA_FLAGS_LOCK_IRQ);
183
184 static DEFINE_SPINLOCK(tid_lock);
185 static u32 tid;
186
187 #define PATH_REC_FIELD(field) \
188 .struct_offset_bytes = offsetof(struct sa_path_rec, field), \
189 .struct_size_bytes = sizeof_field(struct sa_path_rec, field), \
190 .field_name = "sa_path_rec:" #field
191
192 static const struct ib_field path_rec_table[] = {
193 { PATH_REC_FIELD(service_id),
194 .offset_words = 0,
195 .offset_bits = 0,
196 .size_bits = 64 },
197 { PATH_REC_FIELD(dgid),
198 .offset_words = 2,
199 .offset_bits = 0,
200 .size_bits = 128 },
201 { PATH_REC_FIELD(sgid),
202 .offset_words = 6,
203 .offset_bits = 0,
204 .size_bits = 128 },
205 { PATH_REC_FIELD(ib.dlid),
206 .offset_words = 10,
207 .offset_bits = 0,
208 .size_bits = 16 },
209 { PATH_REC_FIELD(ib.slid),
210 .offset_words = 10,
211 .offset_bits = 16,
212 .size_bits = 16 },
213 { PATH_REC_FIELD(ib.raw_traffic),
214 .offset_words = 11,
215 .offset_bits = 0,
216 .size_bits = 1 },
217 { RESERVED,
218 .offset_words = 11,
219 .offset_bits = 1,
220 .size_bits = 3 },
221 { PATH_REC_FIELD(flow_label),
222 .offset_words = 11,
223 .offset_bits = 4,
224 .size_bits = 20 },
225 { PATH_REC_FIELD(hop_limit),
226 .offset_words = 11,
227 .offset_bits = 24,
228 .size_bits = 8 },
229 { PATH_REC_FIELD(traffic_class),
230 .offset_words = 12,
231 .offset_bits = 0,
232 .size_bits = 8 },
233 { PATH_REC_FIELD(reversible),
234 .offset_words = 12,
235 .offset_bits = 8,
236 .size_bits = 1 },
237 { PATH_REC_FIELD(numb_path),
238 .offset_words = 12,
239 .offset_bits = 9,
240 .size_bits = 7 },
241 { PATH_REC_FIELD(pkey),
242 .offset_words = 12,
243 .offset_bits = 16,
244 .size_bits = 16 },
245 { PATH_REC_FIELD(qos_class),
246 .offset_words = 13,
247 .offset_bits = 0,
248 .size_bits = 12 },
249 { PATH_REC_FIELD(sl),
250 .offset_words = 13,
251 .offset_bits = 12,
252 .size_bits = 4 },
253 { PATH_REC_FIELD(mtu_selector),
254 .offset_words = 13,
255 .offset_bits = 16,
256 .size_bits = 2 },
257 { PATH_REC_FIELD(mtu),
258 .offset_words = 13,
259 .offset_bits = 18,
260 .size_bits = 6 },
261 { PATH_REC_FIELD(rate_selector),
262 .offset_words = 13,
263 .offset_bits = 24,
264 .size_bits = 2 },
265 { PATH_REC_FIELD(rate),
266 .offset_words = 13,
267 .offset_bits = 26,
268 .size_bits = 6 },
269 { PATH_REC_FIELD(packet_life_time_selector),
270 .offset_words = 14,
271 .offset_bits = 0,
272 .size_bits = 2 },
273 { PATH_REC_FIELD(packet_life_time),
274 .offset_words = 14,
275 .offset_bits = 2,
276 .size_bits = 6 },
277 { PATH_REC_FIELD(preference),
278 .offset_words = 14,
279 .offset_bits = 8,
280 .size_bits = 8 },
281 { RESERVED,
282 .offset_words = 14,
283 .offset_bits = 16,
284 .size_bits = 48 },
285 };
286
287 #define OPA_PATH_REC_FIELD(field) \
288 .struct_offset_bytes = \
289 offsetof(struct sa_path_rec, field), \
290 .struct_size_bytes = \
291 sizeof_field(struct sa_path_rec, field), \
292 .field_name = "sa_path_rec:" #field
293
294 static const struct ib_field opa_path_rec_table[] = {
295 { OPA_PATH_REC_FIELD(service_id),
296 .offset_words = 0,
297 .offset_bits = 0,
298 .size_bits = 64 },
299 { OPA_PATH_REC_FIELD(dgid),
300 .offset_words = 2,
301 .offset_bits = 0,
302 .size_bits = 128 },
303 { OPA_PATH_REC_FIELD(sgid),
304 .offset_words = 6,
305 .offset_bits = 0,
306 .size_bits = 128 },
307 { OPA_PATH_REC_FIELD(opa.dlid),
308 .offset_words = 10,
309 .offset_bits = 0,
310 .size_bits = 32 },
311 { OPA_PATH_REC_FIELD(opa.slid),
312 .offset_words = 11,
313 .offset_bits = 0,
314 .size_bits = 32 },
315 { OPA_PATH_REC_FIELD(opa.raw_traffic),
316 .offset_words = 12,
317 .offset_bits = 0,
318 .size_bits = 1 },
319 { RESERVED,
320 .offset_words = 12,
321 .offset_bits = 1,
322 .size_bits = 3 },
323 { OPA_PATH_REC_FIELD(flow_label),
324 .offset_words = 12,
325 .offset_bits = 4,
326 .size_bits = 20 },
327 { OPA_PATH_REC_FIELD(hop_limit),
328 .offset_words = 12,
329 .offset_bits = 24,
330 .size_bits = 8 },
331 { OPA_PATH_REC_FIELD(traffic_class),
332 .offset_words = 13,
333 .offset_bits = 0,
334 .size_bits = 8 },
335 { OPA_PATH_REC_FIELD(reversible),
336 .offset_words = 13,
337 .offset_bits = 8,
338 .size_bits = 1 },
339 { OPA_PATH_REC_FIELD(numb_path),
340 .offset_words = 13,
341 .offset_bits = 9,
342 .size_bits = 7 },
343 { OPA_PATH_REC_FIELD(pkey),
344 .offset_words = 13,
345 .offset_bits = 16,
346 .size_bits = 16 },
347 { OPA_PATH_REC_FIELD(opa.l2_8B),
348 .offset_words = 14,
349 .offset_bits = 0,
350 .size_bits = 1 },
351 { OPA_PATH_REC_FIELD(opa.l2_10B),
352 .offset_words = 14,
353 .offset_bits = 1,
354 .size_bits = 1 },
355 { OPA_PATH_REC_FIELD(opa.l2_9B),
356 .offset_words = 14,
357 .offset_bits = 2,
358 .size_bits = 1 },
359 { OPA_PATH_REC_FIELD(opa.l2_16B),
360 .offset_words = 14,
361 .offset_bits = 3,
362 .size_bits = 1 },
363 { RESERVED,
364 .offset_words = 14,
365 .offset_bits = 4,
366 .size_bits = 2 },
367 { OPA_PATH_REC_FIELD(opa.qos_type),
368 .offset_words = 14,
369 .offset_bits = 6,
370 .size_bits = 2 },
371 { OPA_PATH_REC_FIELD(opa.qos_priority),
372 .offset_words = 14,
373 .offset_bits = 8,
374 .size_bits = 8 },
375 { RESERVED,
376 .offset_words = 14,
377 .offset_bits = 16,
378 .size_bits = 3 },
379 { OPA_PATH_REC_FIELD(sl),
380 .offset_words = 14,
381 .offset_bits = 19,
382 .size_bits = 5 },
383 { RESERVED,
384 .offset_words = 14,
385 .offset_bits = 24,
386 .size_bits = 8 },
387 { OPA_PATH_REC_FIELD(mtu_selector),
388 .offset_words = 15,
389 .offset_bits = 0,
390 .size_bits = 2 },
391 { OPA_PATH_REC_FIELD(mtu),
392 .offset_words = 15,
393 .offset_bits = 2,
394 .size_bits = 6 },
395 { OPA_PATH_REC_FIELD(rate_selector),
396 .offset_words = 15,
397 .offset_bits = 8,
398 .size_bits = 2 },
399 { OPA_PATH_REC_FIELD(rate),
400 .offset_words = 15,
401 .offset_bits = 10,
402 .size_bits = 6 },
403 { OPA_PATH_REC_FIELD(packet_life_time_selector),
404 .offset_words = 15,
405 .offset_bits = 16,
406 .size_bits = 2 },
407 { OPA_PATH_REC_FIELD(packet_life_time),
408 .offset_words = 15,
409 .offset_bits = 18,
410 .size_bits = 6 },
411 { OPA_PATH_REC_FIELD(preference),
412 .offset_words = 15,
413 .offset_bits = 24,
414 .size_bits = 8 },
415 };
416
417 #define MCMEMBER_REC_FIELD(field) \
418 .struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field), \
419 .struct_size_bytes = sizeof_field(struct ib_sa_mcmember_rec, field), \
420 .field_name = "sa_mcmember_rec:" #field
421
422 static const struct ib_field mcmember_rec_table[] = {
423 { MCMEMBER_REC_FIELD(mgid),
424 .offset_words = 0,
425 .offset_bits = 0,
426 .size_bits = 128 },
427 { MCMEMBER_REC_FIELD(port_gid),
428 .offset_words = 4,
429 .offset_bits = 0,
430 .size_bits = 128 },
431 { MCMEMBER_REC_FIELD(qkey),
432 .offset_words = 8,
433 .offset_bits = 0,
434 .size_bits = 32 },
435 { MCMEMBER_REC_FIELD(mlid),
436 .offset_words = 9,
437 .offset_bits = 0,
438 .size_bits = 16 },
439 { MCMEMBER_REC_FIELD(mtu_selector),
440 .offset_words = 9,
441 .offset_bits = 16,
442 .size_bits = 2 },
443 { MCMEMBER_REC_FIELD(mtu),
444 .offset_words = 9,
445 .offset_bits = 18,
446 .size_bits = 6 },
447 { MCMEMBER_REC_FIELD(traffic_class),
448 .offset_words = 9,
449 .offset_bits = 24,
450 .size_bits = 8 },
451 { MCMEMBER_REC_FIELD(pkey),
452 .offset_words = 10,
453 .offset_bits = 0,
454 .size_bits = 16 },
455 { MCMEMBER_REC_FIELD(rate_selector),
456 .offset_words = 10,
457 .offset_bits = 16,
458 .size_bits = 2 },
459 { MCMEMBER_REC_FIELD(rate),
460 .offset_words = 10,
461 .offset_bits = 18,
462 .size_bits = 6 },
463 { MCMEMBER_REC_FIELD(packet_life_time_selector),
464 .offset_words = 10,
465 .offset_bits = 24,
466 .size_bits = 2 },
467 { MCMEMBER_REC_FIELD(packet_life_time),
468 .offset_words = 10,
469 .offset_bits = 26,
470 .size_bits = 6 },
471 { MCMEMBER_REC_FIELD(sl),
472 .offset_words = 11,
473 .offset_bits = 0,
474 .size_bits = 4 },
475 { MCMEMBER_REC_FIELD(flow_label),
476 .offset_words = 11,
477 .offset_bits = 4,
478 .size_bits = 20 },
479 { MCMEMBER_REC_FIELD(hop_limit),
480 .offset_words = 11,
481 .offset_bits = 24,
482 .size_bits = 8 },
483 { MCMEMBER_REC_FIELD(scope),
484 .offset_words = 12,
485 .offset_bits = 0,
486 .size_bits = 4 },
487 { MCMEMBER_REC_FIELD(join_state),
488 .offset_words = 12,
489 .offset_bits = 4,
490 .size_bits = 4 },
491 { MCMEMBER_REC_FIELD(proxy_join),
492 .offset_words = 12,
493 .offset_bits = 8,
494 .size_bits = 1 },
495 { RESERVED,
496 .offset_words = 12,
497 .offset_bits = 9,
498 .size_bits = 23 },
499 };
500
501 #define CLASSPORTINFO_REC_FIELD(field) \
502 .struct_offset_bytes = offsetof(struct ib_class_port_info, field), \
503 .struct_size_bytes = sizeof_field(struct ib_class_port_info, field), \
504 .field_name = "ib_class_port_info:" #field
505
506 static const struct ib_field ib_classport_info_rec_table[] = {
507 { CLASSPORTINFO_REC_FIELD(base_version),
508 .offset_words = 0,
509 .offset_bits = 0,
510 .size_bits = 8 },
511 { CLASSPORTINFO_REC_FIELD(class_version),
512 .offset_words = 0,
513 .offset_bits = 8,
514 .size_bits = 8 },
515 { CLASSPORTINFO_REC_FIELD(capability_mask),
516 .offset_words = 0,
517 .offset_bits = 16,
518 .size_bits = 16 },
519 { CLASSPORTINFO_REC_FIELD(cap_mask2_resp_time),
520 .offset_words = 1,
521 .offset_bits = 0,
522 .size_bits = 32 },
523 { CLASSPORTINFO_REC_FIELD(redirect_gid),
524 .offset_words = 2,
525 .offset_bits = 0,
526 .size_bits = 128 },
527 { CLASSPORTINFO_REC_FIELD(redirect_tcslfl),
528 .offset_words = 6,
529 .offset_bits = 0,
530 .size_bits = 32 },
531 { CLASSPORTINFO_REC_FIELD(redirect_lid),
532 .offset_words = 7,
533 .offset_bits = 0,
534 .size_bits = 16 },
535 { CLASSPORTINFO_REC_FIELD(redirect_pkey),
536 .offset_words = 7,
537 .offset_bits = 16,
538 .size_bits = 16 },
539
540 { CLASSPORTINFO_REC_FIELD(redirect_qp),
541 .offset_words = 8,
542 .offset_bits = 0,
543 .size_bits = 32 },
544 { CLASSPORTINFO_REC_FIELD(redirect_qkey),
545 .offset_words = 9,
546 .offset_bits = 0,
547 .size_bits = 32 },
548
549 { CLASSPORTINFO_REC_FIELD(trap_gid),
550 .offset_words = 10,
551 .offset_bits = 0,
552 .size_bits = 128 },
553 { CLASSPORTINFO_REC_FIELD(trap_tcslfl),
554 .offset_words = 14,
555 .offset_bits = 0,
556 .size_bits = 32 },
557
558 { CLASSPORTINFO_REC_FIELD(trap_lid),
559 .offset_words = 15,
560 .offset_bits = 0,
561 .size_bits = 16 },
562 { CLASSPORTINFO_REC_FIELD(trap_pkey),
563 .offset_words = 15,
564 .offset_bits = 16,
565 .size_bits = 16 },
566
567 { CLASSPORTINFO_REC_FIELD(trap_hlqp),
568 .offset_words = 16,
569 .offset_bits = 0,
570 .size_bits = 32 },
571 { CLASSPORTINFO_REC_FIELD(trap_qkey),
572 .offset_words = 17,
573 .offset_bits = 0,
574 .size_bits = 32 },
575 };
576
577 #define OPA_CLASSPORTINFO_REC_FIELD(field) \
578 .struct_offset_bytes =\
579 offsetof(struct opa_class_port_info, field), \
580 .struct_size_bytes = \
581 sizeof_field(struct opa_class_port_info, field), \
582 .field_name = "opa_class_port_info:" #field
583
584 static const struct ib_field opa_classport_info_rec_table[] = {
585 { OPA_CLASSPORTINFO_REC_FIELD(base_version),
586 .offset_words = 0,
587 .offset_bits = 0,
588 .size_bits = 8 },
589 { OPA_CLASSPORTINFO_REC_FIELD(class_version),
590 .offset_words = 0,
591 .offset_bits = 8,
592 .size_bits = 8 },
593 { OPA_CLASSPORTINFO_REC_FIELD(cap_mask),
594 .offset_words = 0,
595 .offset_bits = 16,
596 .size_bits = 16 },
597 { OPA_CLASSPORTINFO_REC_FIELD(cap_mask2_resp_time),
598 .offset_words = 1,
599 .offset_bits = 0,
600 .size_bits = 32 },
601 { OPA_CLASSPORTINFO_REC_FIELD(redirect_gid),
602 .offset_words = 2,
603 .offset_bits = 0,
604 .size_bits = 128 },
605 { OPA_CLASSPORTINFO_REC_FIELD(redirect_tc_fl),
606 .offset_words = 6,
607 .offset_bits = 0,
608 .size_bits = 32 },
609 { OPA_CLASSPORTINFO_REC_FIELD(redirect_lid),
610 .offset_words = 7,
611 .offset_bits = 0,
612 .size_bits = 32 },
613 { OPA_CLASSPORTINFO_REC_FIELD(redirect_sl_qp),
614 .offset_words = 8,
615 .offset_bits = 0,
616 .size_bits = 32 },
617 { OPA_CLASSPORTINFO_REC_FIELD(redirect_qkey),
618 .offset_words = 9,
619 .offset_bits = 0,
620 .size_bits = 32 },
621 { OPA_CLASSPORTINFO_REC_FIELD(trap_gid),
622 .offset_words = 10,
623 .offset_bits = 0,
624 .size_bits = 128 },
625 { OPA_CLASSPORTINFO_REC_FIELD(trap_tc_fl),
626 .offset_words = 14,
627 .offset_bits = 0,
628 .size_bits = 32 },
629 { OPA_CLASSPORTINFO_REC_FIELD(trap_lid),
630 .offset_words = 15,
631 .offset_bits = 0,
632 .size_bits = 32 },
633 { OPA_CLASSPORTINFO_REC_FIELD(trap_hl_qp),
634 .offset_words = 16,
635 .offset_bits = 0,
636 .size_bits = 32 },
637 { OPA_CLASSPORTINFO_REC_FIELD(trap_qkey),
638 .offset_words = 17,
639 .offset_bits = 0,
640 .size_bits = 32 },
641 { OPA_CLASSPORTINFO_REC_FIELD(trap_pkey),
642 .offset_words = 18,
643 .offset_bits = 0,
644 .size_bits = 16 },
645 { OPA_CLASSPORTINFO_REC_FIELD(redirect_pkey),
646 .offset_words = 18,
647 .offset_bits = 16,
648 .size_bits = 16 },
649 { OPA_CLASSPORTINFO_REC_FIELD(trap_sl_rsvd),
650 .offset_words = 19,
651 .offset_bits = 0,
652 .size_bits = 8 },
653 { RESERVED,
654 .offset_words = 19,
655 .offset_bits = 8,
656 .size_bits = 24 },
657 };
658
659 #define GUIDINFO_REC_FIELD(field) \
660 .struct_offset_bytes = offsetof(struct ib_sa_guidinfo_rec, field), \
661 .struct_size_bytes = sizeof_field(struct ib_sa_guidinfo_rec, field), \
662 .field_name = "sa_guidinfo_rec:" #field
663
664 static const struct ib_field guidinfo_rec_table[] = {
665 { GUIDINFO_REC_FIELD(lid),
666 .offset_words = 0,
667 .offset_bits = 0,
668 .size_bits = 16 },
669 { GUIDINFO_REC_FIELD(block_num),
670 .offset_words = 0,
671 .offset_bits = 16,
672 .size_bits = 8 },
673 { GUIDINFO_REC_FIELD(res1),
674 .offset_words = 0,
675 .offset_bits = 24,
676 .size_bits = 8 },
677 { GUIDINFO_REC_FIELD(res2),
678 .offset_words = 1,
679 .offset_bits = 0,
680 .size_bits = 32 },
681 { GUIDINFO_REC_FIELD(guid_info_list),
682 .offset_words = 2,
683 .offset_bits = 0,
684 .size_bits = 512 },
685 };
686
687 #define RDMA_PRIMARY_PATH_MAX_REC_NUM 3
688
ib_sa_disable_local_svc(struct ib_sa_query * query)689 static inline void ib_sa_disable_local_svc(struct ib_sa_query *query)
690 {
691 query->flags &= ~IB_SA_ENABLE_LOCAL_SERVICE;
692 }
693
ib_sa_query_cancelled(struct ib_sa_query * query)694 static inline int ib_sa_query_cancelled(struct ib_sa_query *query)
695 {
696 return (query->flags & IB_SA_CANCEL);
697 }
698
ib_nl_set_path_rec_attrs(struct sk_buff * skb,struct ib_sa_query * query)699 static void ib_nl_set_path_rec_attrs(struct sk_buff *skb,
700 struct ib_sa_query *query)
701 {
702 struct sa_path_rec *sa_rec = query->mad_buf->context[1];
703 struct ib_sa_mad *mad = query->mad_buf->mad;
704 ib_sa_comp_mask comp_mask = mad->sa_hdr.comp_mask;
705 u16 val16;
706 u64 val64;
707 struct rdma_ls_resolve_header *header;
708
709 query->mad_buf->context[1] = NULL;
710
711 /* Construct the family header first */
712 header = skb_put(skb, NLMSG_ALIGN(sizeof(*header)));
713 strscpy_pad(header->device_name,
714 dev_name(&query->port->agent->device->dev),
715 LS_DEVICE_NAME_MAX);
716 header->port_num = query->port->port_num;
717
718 if ((comp_mask & IB_SA_PATH_REC_REVERSIBLE) &&
719 sa_rec->reversible != 0)
720 query->path_use = LS_RESOLVE_PATH_USE_ALL;
721 else
722 query->path_use = LS_RESOLVE_PATH_USE_UNIDIRECTIONAL;
723 header->path_use = query->path_use;
724
725 /* Now build the attributes */
726 if (comp_mask & IB_SA_PATH_REC_SERVICE_ID) {
727 val64 = be64_to_cpu(sa_rec->service_id);
728 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_SERVICE_ID,
729 sizeof(val64), &val64);
730 }
731 if (comp_mask & IB_SA_PATH_REC_DGID)
732 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_DGID,
733 sizeof(sa_rec->dgid), &sa_rec->dgid);
734 if (comp_mask & IB_SA_PATH_REC_SGID)
735 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_SGID,
736 sizeof(sa_rec->sgid), &sa_rec->sgid);
737 if (comp_mask & IB_SA_PATH_REC_TRAFFIC_CLASS)
738 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_TCLASS,
739 sizeof(sa_rec->traffic_class), &sa_rec->traffic_class);
740
741 if (comp_mask & IB_SA_PATH_REC_PKEY) {
742 val16 = be16_to_cpu(sa_rec->pkey);
743 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_PKEY,
744 sizeof(val16), &val16);
745 }
746 if (comp_mask & IB_SA_PATH_REC_QOS_CLASS) {
747 val16 = be16_to_cpu(sa_rec->qos_class);
748 nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_QOS_CLASS,
749 sizeof(val16), &val16);
750 }
751 }
752
ib_nl_get_path_rec_attrs_len(ib_sa_comp_mask comp_mask)753 static int ib_nl_get_path_rec_attrs_len(ib_sa_comp_mask comp_mask)
754 {
755 int len = 0;
756
757 if (comp_mask & IB_SA_PATH_REC_SERVICE_ID)
758 len += nla_total_size(sizeof(u64));
759 if (comp_mask & IB_SA_PATH_REC_DGID)
760 len += nla_total_size(sizeof(struct rdma_nla_ls_gid));
761 if (comp_mask & IB_SA_PATH_REC_SGID)
762 len += nla_total_size(sizeof(struct rdma_nla_ls_gid));
763 if (comp_mask & IB_SA_PATH_REC_TRAFFIC_CLASS)
764 len += nla_total_size(sizeof(u8));
765 if (comp_mask & IB_SA_PATH_REC_PKEY)
766 len += nla_total_size(sizeof(u16));
767 if (comp_mask & IB_SA_PATH_REC_QOS_CLASS)
768 len += nla_total_size(sizeof(u16));
769
770 /*
771 * Make sure that at least some of the required comp_mask bits are
772 * set.
773 */
774 if (WARN_ON(len == 0))
775 return len;
776
777 /* Add the family header */
778 len += NLMSG_ALIGN(sizeof(struct rdma_ls_resolve_header));
779
780 return len;
781 }
782
ib_nl_make_request(struct ib_sa_query * query,gfp_t gfp_mask)783 static int ib_nl_make_request(struct ib_sa_query *query, gfp_t gfp_mask)
784 {
785 struct sk_buff *skb = NULL;
786 struct nlmsghdr *nlh;
787 void *data;
788 struct ib_sa_mad *mad;
789 int len;
790 unsigned long flags;
791 unsigned long delay;
792 gfp_t gfp_flag;
793 int ret;
794
795 INIT_LIST_HEAD(&query->list);
796 query->seq = (u32)atomic_inc_return(&ib_nl_sa_request_seq);
797
798 mad = query->mad_buf->mad;
799 len = ib_nl_get_path_rec_attrs_len(mad->sa_hdr.comp_mask);
800 if (len <= 0)
801 return -EMSGSIZE;
802
803 skb = nlmsg_new(len, gfp_mask);
804 if (!skb)
805 return -ENOMEM;
806
807 /* Put nlmsg header only for now */
808 data = ibnl_put_msg(skb, &nlh, query->seq, 0, RDMA_NL_LS,
809 RDMA_NL_LS_OP_RESOLVE, NLM_F_REQUEST);
810 if (!data) {
811 nlmsg_free(skb);
812 return -EMSGSIZE;
813 }
814
815 /* Add attributes */
816 ib_nl_set_path_rec_attrs(skb, query);
817
818 /* Repair the nlmsg header length */
819 nlmsg_end(skb, nlh);
820
821 gfp_flag = ((gfp_mask & GFP_ATOMIC) == GFP_ATOMIC) ? GFP_ATOMIC :
822 GFP_NOWAIT;
823
824 spin_lock_irqsave(&ib_nl_request_lock, flags);
825 ret = rdma_nl_multicast(&init_net, skb, RDMA_NL_GROUP_LS, gfp_flag);
826
827 if (ret)
828 goto out;
829
830 /* Put the request on the list.*/
831 delay = msecs_to_jiffies(sa_local_svc_timeout_ms);
832 query->timeout = delay + jiffies;
833 list_add_tail(&query->list, &ib_nl_request_list);
834 /* Start the timeout if this is the only request */
835 if (ib_nl_request_list.next == &query->list)
836 queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay);
837
838 out:
839 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
840
841 return ret;
842 }
843
ib_nl_cancel_request(struct ib_sa_query * query)844 static int ib_nl_cancel_request(struct ib_sa_query *query)
845 {
846 unsigned long flags;
847 struct ib_sa_query *wait_query;
848 int found = 0;
849
850 spin_lock_irqsave(&ib_nl_request_lock, flags);
851 list_for_each_entry(wait_query, &ib_nl_request_list, list) {
852 /* Let the timeout to take care of the callback */
853 if (query == wait_query) {
854 query->flags |= IB_SA_CANCEL;
855 query->timeout = jiffies;
856 list_move(&query->list, &ib_nl_request_list);
857 found = 1;
858 mod_delayed_work(ib_nl_wq, &ib_nl_timed_work, 1);
859 break;
860 }
861 }
862 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
863
864 return found;
865 }
866
867 static void send_handler(struct ib_mad_agent *agent,
868 struct ib_mad_send_wc *mad_send_wc);
869
ib_nl_process_good_resolve_rsp(struct ib_sa_query * query,const struct nlmsghdr * nlh)870 static void ib_nl_process_good_resolve_rsp(struct ib_sa_query *query,
871 const struct nlmsghdr *nlh)
872 {
873 struct sa_path_rec recs[RDMA_PRIMARY_PATH_MAX_REC_NUM];
874 struct ib_sa_path_query *path_query;
875 struct ib_path_rec_data *rec_data;
876 struct ib_mad_send_wc mad_send_wc;
877 const struct nlattr *head, *curr;
878 struct ib_sa_mad *mad = NULL;
879 int len, rem, status = -EIO;
880 unsigned int num_prs = 0;
881 u32 mask = 0;
882
883 if (!query->callback)
884 goto out;
885
886 path_query = container_of(query, struct ib_sa_path_query, sa_query);
887 mad = query->mad_buf->mad;
888
889 head = (const struct nlattr *) nlmsg_data(nlh);
890 len = nlmsg_len(nlh);
891 switch (query->path_use) {
892 case LS_RESOLVE_PATH_USE_UNIDIRECTIONAL:
893 mask = IB_PATH_PRIMARY | IB_PATH_OUTBOUND;
894 break;
895
896 case LS_RESOLVE_PATH_USE_ALL:
897 mask = IB_PATH_PRIMARY;
898 break;
899
900 case LS_RESOLVE_PATH_USE_GMP:
901 default:
902 mask = IB_PATH_PRIMARY | IB_PATH_GMP |
903 IB_PATH_BIDIRECTIONAL;
904 break;
905 }
906
907 nla_for_each_attr(curr, head, len, rem) {
908 if (curr->nla_type != LS_NLA_TYPE_PATH_RECORD)
909 continue;
910
911 rec_data = nla_data(curr);
912 if ((rec_data->flags & mask) != mask)
913 continue;
914
915 if ((query->flags & IB_SA_QUERY_OPA) ||
916 path_query->conv_pr) {
917 mad->mad_hdr.method |= IB_MGMT_METHOD_RESP;
918 memcpy(mad->data, rec_data->path_rec,
919 sizeof(rec_data->path_rec));
920 query->callback(query, 0, mad);
921 goto out;
922 }
923
924 status = 0;
925 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
926 rec_data->path_rec, &recs[num_prs]);
927 recs[num_prs].flags = rec_data->flags;
928 recs[num_prs].rec_type = SA_PATH_REC_TYPE_IB;
929 sa_path_set_dmac_zero(&recs[num_prs]);
930
931 num_prs++;
932 if (num_prs >= RDMA_PRIMARY_PATH_MAX_REC_NUM)
933 break;
934 }
935
936 if (!status) {
937 mad->mad_hdr.method |= IB_MGMT_METHOD_RESP;
938 path_query->callback(status, recs, num_prs,
939 path_query->context);
940 } else
941 query->callback(query, status, mad);
942
943 out:
944 mad_send_wc.send_buf = query->mad_buf;
945 mad_send_wc.status = IB_WC_SUCCESS;
946 send_handler(query->mad_buf->mad_agent, &mad_send_wc);
947 }
948
ib_nl_request_timeout(struct work_struct * work)949 static void ib_nl_request_timeout(struct work_struct *work)
950 {
951 unsigned long flags;
952 struct ib_sa_query *query;
953 unsigned long delay;
954 struct ib_mad_send_wc mad_send_wc;
955 int ret;
956
957 spin_lock_irqsave(&ib_nl_request_lock, flags);
958 while (!list_empty(&ib_nl_request_list)) {
959 query = list_entry(ib_nl_request_list.next,
960 struct ib_sa_query, list);
961
962 if (time_after(query->timeout, jiffies)) {
963 delay = query->timeout - jiffies;
964 if ((long)delay <= 0)
965 delay = 1;
966 queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay);
967 break;
968 }
969
970 list_del(&query->list);
971 ib_sa_disable_local_svc(query);
972 /* Hold the lock to protect against query cancellation */
973 if (ib_sa_query_cancelled(query))
974 ret = -1;
975 else
976 ret = ib_post_send_mad(query->mad_buf, NULL);
977 if (ret) {
978 mad_send_wc.send_buf = query->mad_buf;
979 mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
980 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
981 send_handler(query->port->agent, &mad_send_wc);
982 spin_lock_irqsave(&ib_nl_request_lock, flags);
983 }
984 }
985 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
986 }
987
ib_nl_handle_set_timeout(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)988 int ib_nl_handle_set_timeout(struct sk_buff *skb,
989 struct nlmsghdr *nlh,
990 struct netlink_ext_ack *extack)
991 {
992 int timeout, delta, abs_delta;
993 const struct nlattr *attr;
994 unsigned long flags;
995 struct ib_sa_query *query;
996 long delay = 0;
997 struct nlattr *tb[LS_NLA_TYPE_MAX];
998 int ret;
999
1000 if (!(nlh->nlmsg_flags & NLM_F_REQUEST) ||
1001 !(NETLINK_CB(skb).sk))
1002 return -EPERM;
1003
1004 ret = nla_parse_deprecated(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
1005 nlmsg_len(nlh), ib_nl_policy, NULL);
1006 attr = (const struct nlattr *)tb[LS_NLA_TYPE_TIMEOUT];
1007 if (ret || !attr)
1008 goto settimeout_out;
1009
1010 timeout = *(int *) nla_data(attr);
1011 if (timeout < IB_SA_LOCAL_SVC_TIMEOUT_MIN)
1012 timeout = IB_SA_LOCAL_SVC_TIMEOUT_MIN;
1013 if (timeout > IB_SA_LOCAL_SVC_TIMEOUT_MAX)
1014 timeout = IB_SA_LOCAL_SVC_TIMEOUT_MAX;
1015
1016 delta = timeout - sa_local_svc_timeout_ms;
1017 if (delta < 0)
1018 abs_delta = -delta;
1019 else
1020 abs_delta = delta;
1021
1022 if (delta != 0) {
1023 spin_lock_irqsave(&ib_nl_request_lock, flags);
1024 sa_local_svc_timeout_ms = timeout;
1025 list_for_each_entry(query, &ib_nl_request_list, list) {
1026 if (delta < 0 && abs_delta > query->timeout)
1027 query->timeout = 0;
1028 else
1029 query->timeout += delta;
1030
1031 /* Get the new delay from the first entry */
1032 if (!delay) {
1033 delay = query->timeout - jiffies;
1034 if (delay <= 0)
1035 delay = 1;
1036 }
1037 }
1038 if (delay)
1039 mod_delayed_work(ib_nl_wq, &ib_nl_timed_work,
1040 (unsigned long)delay);
1041 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
1042 }
1043
1044 settimeout_out:
1045 return 0;
1046 }
1047
ib_nl_is_good_resolve_resp(const struct nlmsghdr * nlh)1048 static inline int ib_nl_is_good_resolve_resp(const struct nlmsghdr *nlh)
1049 {
1050 struct nlattr *tb[LS_NLA_TYPE_MAX];
1051 int ret;
1052
1053 if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR)
1054 return 0;
1055
1056 ret = nla_parse_deprecated(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
1057 nlmsg_len(nlh), ib_nl_policy, NULL);
1058 if (ret)
1059 return 0;
1060
1061 return 1;
1062 }
1063
ib_nl_handle_resolve_resp(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)1064 int ib_nl_handle_resolve_resp(struct sk_buff *skb,
1065 struct nlmsghdr *nlh,
1066 struct netlink_ext_ack *extack)
1067 {
1068 unsigned long flags;
1069 struct ib_sa_query *query = NULL, *iter;
1070 struct ib_mad_send_buf *send_buf;
1071 struct ib_mad_send_wc mad_send_wc;
1072 int ret;
1073
1074 if ((nlh->nlmsg_flags & NLM_F_REQUEST) ||
1075 !(NETLINK_CB(skb).sk))
1076 return -EPERM;
1077
1078 spin_lock_irqsave(&ib_nl_request_lock, flags);
1079 list_for_each_entry(iter, &ib_nl_request_list, list) {
1080 /*
1081 * If the query is cancelled, let the timeout routine
1082 * take care of it.
1083 */
1084 if (nlh->nlmsg_seq == iter->seq) {
1085 if (!ib_sa_query_cancelled(iter)) {
1086 list_del(&iter->list);
1087 query = iter;
1088 }
1089 break;
1090 }
1091 }
1092
1093 if (!query) {
1094 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
1095 goto resp_out;
1096 }
1097
1098 send_buf = query->mad_buf;
1099
1100 if (!ib_nl_is_good_resolve_resp(nlh)) {
1101 /* if the result is a failure, send out the packet via IB */
1102 ib_sa_disable_local_svc(query);
1103 ret = ib_post_send_mad(query->mad_buf, NULL);
1104 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
1105 if (ret) {
1106 mad_send_wc.send_buf = send_buf;
1107 mad_send_wc.status = IB_WC_GENERAL_ERR;
1108 send_handler(query->port->agent, &mad_send_wc);
1109 }
1110 } else {
1111 spin_unlock_irqrestore(&ib_nl_request_lock, flags);
1112 ib_nl_process_good_resolve_rsp(query, nlh);
1113 }
1114
1115 resp_out:
1116 return 0;
1117 }
1118
free_sm_ah(struct kref * kref)1119 static void free_sm_ah(struct kref *kref)
1120 {
1121 struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref);
1122
1123 rdma_destroy_ah(sm_ah->ah, 0);
1124 kfree(sm_ah);
1125 }
1126
ib_sa_register_client(struct ib_sa_client * client)1127 void ib_sa_register_client(struct ib_sa_client *client)
1128 {
1129 atomic_set(&client->users, 1);
1130 init_completion(&client->comp);
1131 }
1132 EXPORT_SYMBOL(ib_sa_register_client);
1133
ib_sa_unregister_client(struct ib_sa_client * client)1134 void ib_sa_unregister_client(struct ib_sa_client *client)
1135 {
1136 ib_sa_client_put(client);
1137 wait_for_completion(&client->comp);
1138 }
1139 EXPORT_SYMBOL(ib_sa_unregister_client);
1140
1141 /**
1142 * ib_sa_cancel_query - try to cancel an SA query
1143 * @id:ID of query to cancel
1144 * @query:query pointer to cancel
1145 *
1146 * Try to cancel an SA query. If the id and query don't match up or
1147 * the query has already completed, nothing is done. Otherwise the
1148 * query is canceled and will complete with a status of -EINTR.
1149 */
ib_sa_cancel_query(int id,struct ib_sa_query * query)1150 void ib_sa_cancel_query(int id, struct ib_sa_query *query)
1151 {
1152 unsigned long flags;
1153 struct ib_mad_send_buf *mad_buf;
1154
1155 xa_lock_irqsave(&queries, flags);
1156 if (xa_load(&queries, id) != query) {
1157 xa_unlock_irqrestore(&queries, flags);
1158 return;
1159 }
1160 mad_buf = query->mad_buf;
1161 xa_unlock_irqrestore(&queries, flags);
1162
1163 /*
1164 * If the query is still on the netlink request list, schedule
1165 * it to be cancelled by the timeout routine. Otherwise, it has been
1166 * sent to the MAD layer and has to be cancelled from there.
1167 */
1168 if (!ib_nl_cancel_request(query))
1169 ib_cancel_mad(mad_buf);
1170 }
1171 EXPORT_SYMBOL(ib_sa_cancel_query);
1172
get_src_path_mask(struct ib_device * device,u32 port_num)1173 static u8 get_src_path_mask(struct ib_device *device, u32 port_num)
1174 {
1175 struct ib_sa_device *sa_dev;
1176 struct ib_sa_port *port;
1177 unsigned long flags;
1178 u8 src_path_mask;
1179
1180 sa_dev = ib_get_client_data(device, &sa_client);
1181 if (!sa_dev)
1182 return 0x7f;
1183
1184 port = &sa_dev->port[port_num - sa_dev->start_port];
1185 spin_lock_irqsave(&port->ah_lock, flags);
1186 src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f;
1187 spin_unlock_irqrestore(&port->ah_lock, flags);
1188
1189 return src_path_mask;
1190 }
1191
init_ah_attr_grh_fields(struct ib_device * device,u32 port_num,struct sa_path_rec * rec,struct rdma_ah_attr * ah_attr,const struct ib_gid_attr * gid_attr)1192 static int init_ah_attr_grh_fields(struct ib_device *device, u32 port_num,
1193 struct sa_path_rec *rec,
1194 struct rdma_ah_attr *ah_attr,
1195 const struct ib_gid_attr *gid_attr)
1196 {
1197 enum ib_gid_type type = sa_conv_pathrec_to_gid_type(rec);
1198
1199 if (!gid_attr) {
1200 gid_attr = rdma_find_gid_by_port(device, &rec->sgid, type,
1201 port_num, NULL);
1202 if (IS_ERR(gid_attr))
1203 return PTR_ERR(gid_attr);
1204 } else
1205 rdma_hold_gid_attr(gid_attr);
1206
1207 rdma_move_grh_sgid_attr(ah_attr, &rec->dgid,
1208 be32_to_cpu(rec->flow_label),
1209 rec->hop_limit, rec->traffic_class,
1210 gid_attr);
1211 return 0;
1212 }
1213
1214 /**
1215 * ib_init_ah_attr_from_path - Initialize address handle attributes based on
1216 * an SA path record.
1217 * @device: Device associated ah attributes initialization.
1218 * @port_num: Port on the specified device.
1219 * @rec: path record entry to use for ah attributes initialization.
1220 * @ah_attr: address handle attributes to initialization from path record.
1221 * @gid_attr: SGID attribute to consider during initialization.
1222 *
1223 * When ib_init_ah_attr_from_path() returns success,
1224 * (a) for IB link layer it optionally contains a reference to SGID attribute
1225 * when GRH is present for IB link layer.
1226 * (b) for RoCE link layer it contains a reference to SGID attribute.
1227 * User must invoke rdma_destroy_ah_attr() to release reference to SGID
1228 * attributes which are initialized using ib_init_ah_attr_from_path().
1229 */
ib_init_ah_attr_from_path(struct ib_device * device,u32 port_num,struct sa_path_rec * rec,struct rdma_ah_attr * ah_attr,const struct ib_gid_attr * gid_attr)1230 int ib_init_ah_attr_from_path(struct ib_device *device, u32 port_num,
1231 struct sa_path_rec *rec,
1232 struct rdma_ah_attr *ah_attr,
1233 const struct ib_gid_attr *gid_attr)
1234 {
1235 int ret = 0;
1236
1237 memset(ah_attr, 0, sizeof(*ah_attr));
1238 ah_attr->type = rdma_ah_find_type(device, port_num);
1239 rdma_ah_set_sl(ah_attr, rec->sl);
1240 rdma_ah_set_port_num(ah_attr, port_num);
1241 rdma_ah_set_static_rate(ah_attr, rec->rate);
1242
1243 if (sa_path_is_roce(rec)) {
1244 ret = roce_resolve_route_from_path(rec, gid_attr);
1245 if (ret)
1246 return ret;
1247
1248 memcpy(ah_attr->roce.dmac, sa_path_get_dmac(rec), ETH_ALEN);
1249 } else {
1250 rdma_ah_set_dlid(ah_attr, be32_to_cpu(sa_path_get_dlid(rec)));
1251 if (sa_path_is_opa(rec) &&
1252 rdma_ah_get_dlid(ah_attr) == be16_to_cpu(IB_LID_PERMISSIVE))
1253 rdma_ah_set_make_grd(ah_attr, true);
1254
1255 rdma_ah_set_path_bits(ah_attr,
1256 be32_to_cpu(sa_path_get_slid(rec)) &
1257 get_src_path_mask(device, port_num));
1258 }
1259
1260 if (rec->hop_limit > 0 || sa_path_is_roce(rec))
1261 ret = init_ah_attr_grh_fields(device, port_num,
1262 rec, ah_attr, gid_attr);
1263 return ret;
1264 }
1265 EXPORT_SYMBOL(ib_init_ah_attr_from_path);
1266
alloc_mad(struct ib_sa_query * query,gfp_t gfp_mask)1267 static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask)
1268 {
1269 struct rdma_ah_attr ah_attr;
1270 unsigned long flags;
1271
1272 spin_lock_irqsave(&query->port->ah_lock, flags);
1273 if (!query->port->sm_ah) {
1274 spin_unlock_irqrestore(&query->port->ah_lock, flags);
1275 return -EAGAIN;
1276 }
1277 kref_get(&query->port->sm_ah->ref);
1278 query->sm_ah = query->port->sm_ah;
1279 spin_unlock_irqrestore(&query->port->ah_lock, flags);
1280
1281 /*
1282 * Always check if sm_ah has valid dlid assigned,
1283 * before querying for class port info
1284 */
1285 if ((rdma_query_ah(query->sm_ah->ah, &ah_attr) < 0) ||
1286 !rdma_is_valid_unicast_lid(&ah_attr)) {
1287 kref_put(&query->sm_ah->ref, free_sm_ah);
1288 return -EAGAIN;
1289 }
1290 query->mad_buf = ib_create_send_mad(query->port->agent, 1,
1291 query->sm_ah->pkey_index,
1292 0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA,
1293 gfp_mask,
1294 ((query->flags & IB_SA_QUERY_OPA) ?
1295 OPA_MGMT_BASE_VERSION :
1296 IB_MGMT_BASE_VERSION));
1297 if (IS_ERR(query->mad_buf)) {
1298 kref_put(&query->sm_ah->ref, free_sm_ah);
1299 return -ENOMEM;
1300 }
1301
1302 query->mad_buf->ah = query->sm_ah->ah;
1303
1304 return 0;
1305 }
1306
free_mad(struct ib_sa_query * query)1307 static void free_mad(struct ib_sa_query *query)
1308 {
1309 ib_free_send_mad(query->mad_buf);
1310 kref_put(&query->sm_ah->ref, free_sm_ah);
1311 }
1312
init_mad(struct ib_sa_query * query,struct ib_mad_agent * agent)1313 static void init_mad(struct ib_sa_query *query, struct ib_mad_agent *agent)
1314 {
1315 struct ib_sa_mad *mad = query->mad_buf->mad;
1316 unsigned long flags;
1317
1318 memset(mad, 0, sizeof *mad);
1319
1320 if (query->flags & IB_SA_QUERY_OPA) {
1321 mad->mad_hdr.base_version = OPA_MGMT_BASE_VERSION;
1322 mad->mad_hdr.class_version = OPA_SA_CLASS_VERSION;
1323 } else {
1324 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION;
1325 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
1326 }
1327 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
1328 spin_lock_irqsave(&tid_lock, flags);
1329 mad->mad_hdr.tid =
1330 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
1331 spin_unlock_irqrestore(&tid_lock, flags);
1332 }
1333
send_mad(struct ib_sa_query * query,unsigned long timeout_ms,gfp_t gfp_mask)1334 static int send_mad(struct ib_sa_query *query, unsigned long timeout_ms,
1335 gfp_t gfp_mask)
1336 {
1337 unsigned long flags;
1338 int ret, id;
1339 const int nmbr_sa_query_retries = 10;
1340
1341 xa_lock_irqsave(&queries, flags);
1342 ret = __xa_alloc(&queries, &id, query, xa_limit_32b, gfp_mask);
1343 xa_unlock_irqrestore(&queries, flags);
1344 if (ret < 0)
1345 return ret;
1346
1347 query->mad_buf->timeout_ms = timeout_ms / nmbr_sa_query_retries;
1348 query->mad_buf->retries = nmbr_sa_query_retries;
1349 if (!query->mad_buf->timeout_ms) {
1350 /* Special case, very small timeout_ms */
1351 query->mad_buf->timeout_ms = 1;
1352 query->mad_buf->retries = timeout_ms;
1353 }
1354 query->mad_buf->context[0] = query;
1355 query->id = id;
1356
1357 if ((query->flags & IB_SA_ENABLE_LOCAL_SERVICE) &&
1358 (!(query->flags & IB_SA_QUERY_OPA))) {
1359 if (rdma_nl_chk_listeners(RDMA_NL_GROUP_LS)) {
1360 if (!ib_nl_make_request(query, gfp_mask))
1361 return id;
1362 }
1363 ib_sa_disable_local_svc(query);
1364 }
1365
1366 ret = ib_post_send_mad(query->mad_buf, NULL);
1367 if (ret) {
1368 xa_lock_irqsave(&queries, flags);
1369 __xa_erase(&queries, id);
1370 xa_unlock_irqrestore(&queries, flags);
1371 }
1372
1373 /*
1374 * It's not safe to dereference query any more, because the
1375 * send may already have completed and freed the query in
1376 * another context.
1377 */
1378 return ret ? ret : id;
1379 }
1380
ib_sa_unpack_path(void * attribute,struct sa_path_rec * rec)1381 void ib_sa_unpack_path(void *attribute, struct sa_path_rec *rec)
1382 {
1383 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), attribute, rec);
1384 }
1385 EXPORT_SYMBOL(ib_sa_unpack_path);
1386
ib_sa_pack_path(struct sa_path_rec * rec,void * attribute)1387 void ib_sa_pack_path(struct sa_path_rec *rec, void *attribute)
1388 {
1389 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, attribute);
1390 }
1391 EXPORT_SYMBOL(ib_sa_pack_path);
1392
ib_sa_opa_pathrecord_support(struct ib_sa_client * client,struct ib_sa_device * sa_dev,u32 port_num)1393 static bool ib_sa_opa_pathrecord_support(struct ib_sa_client *client,
1394 struct ib_sa_device *sa_dev,
1395 u32 port_num)
1396 {
1397 struct ib_sa_port *port;
1398 unsigned long flags;
1399 bool ret = false;
1400
1401 port = &sa_dev->port[port_num - sa_dev->start_port];
1402 spin_lock_irqsave(&port->classport_lock, flags);
1403 if (!port->classport_info.valid)
1404 goto ret;
1405
1406 if (port->classport_info.data.type == RDMA_CLASS_PORT_INFO_OPA)
1407 ret = opa_get_cpi_capmask2(&port->classport_info.data.opa) &
1408 OPA_CLASS_PORT_INFO_PR_SUPPORT;
1409 ret:
1410 spin_unlock_irqrestore(&port->classport_lock, flags);
1411 return ret;
1412 }
1413
1414 enum opa_pr_supported {
1415 PR_NOT_SUPPORTED,
1416 PR_OPA_SUPPORTED,
1417 PR_IB_SUPPORTED
1418 };
1419
1420 /*
1421 * opa_pr_query_possible - Check if current PR query can be an OPA query.
1422 *
1423 * Retuns PR_NOT_SUPPORTED if a path record query is not
1424 * possible, PR_OPA_SUPPORTED if an OPA path record query
1425 * is possible and PR_IB_SUPPORTED if an IB path record
1426 * query is possible.
1427 */
opa_pr_query_possible(struct ib_sa_client * client,struct ib_sa_device * sa_dev,struct ib_device * device,u32 port_num)1428 static int opa_pr_query_possible(struct ib_sa_client *client,
1429 struct ib_sa_device *sa_dev,
1430 struct ib_device *device, u32 port_num)
1431 {
1432 struct ib_port_attr port_attr;
1433
1434 if (ib_query_port(device, port_num, &port_attr))
1435 return PR_NOT_SUPPORTED;
1436
1437 if (ib_sa_opa_pathrecord_support(client, sa_dev, port_num))
1438 return PR_OPA_SUPPORTED;
1439
1440 if (port_attr.lid >= be16_to_cpu(IB_MULTICAST_LID_BASE))
1441 return PR_NOT_SUPPORTED;
1442 else
1443 return PR_IB_SUPPORTED;
1444 }
1445
ib_sa_path_rec_callback(struct ib_sa_query * sa_query,int status,struct ib_sa_mad * mad)1446 static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
1447 int status, struct ib_sa_mad *mad)
1448 {
1449 struct ib_sa_path_query *query =
1450 container_of(sa_query, struct ib_sa_path_query, sa_query);
1451 struct sa_path_rec rec = {};
1452
1453 if (!mad) {
1454 query->callback(status, NULL, 0, query->context);
1455 return;
1456 }
1457
1458 if (sa_query->flags & IB_SA_QUERY_OPA) {
1459 ib_unpack(opa_path_rec_table, ARRAY_SIZE(opa_path_rec_table),
1460 mad->data, &rec);
1461 rec.rec_type = SA_PATH_REC_TYPE_OPA;
1462 query->callback(status, &rec, 1, query->context);
1463 return;
1464 }
1465
1466 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
1467 mad->data, &rec);
1468 rec.rec_type = SA_PATH_REC_TYPE_IB;
1469 sa_path_set_dmac_zero(&rec);
1470
1471 if (query->conv_pr) {
1472 struct sa_path_rec opa;
1473
1474 memset(&opa, 0, sizeof(struct sa_path_rec));
1475 sa_convert_path_ib_to_opa(&opa, &rec);
1476 query->callback(status, &opa, 1, query->context);
1477 } else {
1478 query->callback(status, &rec, 1, query->context);
1479 }
1480 }
1481
ib_sa_path_rec_release(struct ib_sa_query * sa_query)1482 static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
1483 {
1484 struct ib_sa_path_query *query =
1485 container_of(sa_query, struct ib_sa_path_query, sa_query);
1486
1487 kfree(query->conv_pr);
1488 kfree(query);
1489 }
1490
1491 /**
1492 * ib_sa_path_rec_get - Start a Path get query
1493 * @client:SA client
1494 * @device:device to send query on
1495 * @port_num: port number to send query on
1496 * @rec:Path Record to send in query
1497 * @comp_mask:component mask to send in query
1498 * @timeout_ms:time to wait for response
1499 * @gfp_mask:GFP mask to use for internal allocations
1500 * @callback:function called when query completes, times out or is
1501 * canceled
1502 * @context:opaque user context passed to callback
1503 * @sa_query:query context, used to cancel query
1504 *
1505 * Send a Path Record Get query to the SA to look up a path. The
1506 * callback function will be called when the query completes (or
1507 * fails); status is 0 for a successful response, -EINTR if the query
1508 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
1509 * occurred sending the query. The resp parameter of the callback is
1510 * only valid if status is 0.
1511 *
1512 * If the return value of ib_sa_path_rec_get() is negative, it is an
1513 * error code. Otherwise it is a query ID that can be used to cancel
1514 * the query.
1515 */
ib_sa_path_rec_get(struct ib_sa_client * client,struct ib_device * device,u32 port_num,struct sa_path_rec * rec,ib_sa_comp_mask comp_mask,unsigned long timeout_ms,gfp_t gfp_mask,void (* callback)(int status,struct sa_path_rec * resp,unsigned int num_paths,void * context),void * context,struct ib_sa_query ** sa_query)1516 int ib_sa_path_rec_get(struct ib_sa_client *client,
1517 struct ib_device *device, u32 port_num,
1518 struct sa_path_rec *rec,
1519 ib_sa_comp_mask comp_mask,
1520 unsigned long timeout_ms, gfp_t gfp_mask,
1521 void (*callback)(int status,
1522 struct sa_path_rec *resp,
1523 unsigned int num_paths, void *context),
1524 void *context,
1525 struct ib_sa_query **sa_query)
1526 {
1527 struct ib_sa_path_query *query;
1528 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1529 struct ib_sa_port *port;
1530 struct ib_mad_agent *agent;
1531 struct ib_sa_mad *mad;
1532 enum opa_pr_supported status;
1533 int ret;
1534
1535 if (!sa_dev)
1536 return -ENODEV;
1537
1538 if ((rec->rec_type != SA_PATH_REC_TYPE_IB) &&
1539 (rec->rec_type != SA_PATH_REC_TYPE_OPA))
1540 return -EINVAL;
1541
1542 port = &sa_dev->port[port_num - sa_dev->start_port];
1543 agent = port->agent;
1544
1545 query = kzalloc(sizeof(*query), gfp_mask);
1546 if (!query)
1547 return -ENOMEM;
1548
1549 query->sa_query.port = port;
1550 if (rec->rec_type == SA_PATH_REC_TYPE_OPA) {
1551 status = opa_pr_query_possible(client, sa_dev, device, port_num);
1552 if (status == PR_NOT_SUPPORTED) {
1553 ret = -EINVAL;
1554 goto err1;
1555 } else if (status == PR_OPA_SUPPORTED) {
1556 query->sa_query.flags |= IB_SA_QUERY_OPA;
1557 } else {
1558 query->conv_pr =
1559 kmalloc(sizeof(*query->conv_pr), gfp_mask);
1560 if (!query->conv_pr) {
1561 ret = -ENOMEM;
1562 goto err1;
1563 }
1564 }
1565 }
1566
1567 ret = alloc_mad(&query->sa_query, gfp_mask);
1568 if (ret)
1569 goto err2;
1570
1571 ib_sa_client_get(client);
1572 query->sa_query.client = client;
1573 query->callback = callback;
1574 query->context = context;
1575
1576 mad = query->sa_query.mad_buf->mad;
1577 init_mad(&query->sa_query, agent);
1578
1579 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
1580 query->sa_query.release = ib_sa_path_rec_release;
1581 mad->mad_hdr.method = IB_MGMT_METHOD_GET;
1582 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC);
1583 mad->sa_hdr.comp_mask = comp_mask;
1584
1585 if (query->sa_query.flags & IB_SA_QUERY_OPA) {
1586 ib_pack(opa_path_rec_table, ARRAY_SIZE(opa_path_rec_table),
1587 rec, mad->data);
1588 } else if (query->conv_pr) {
1589 sa_convert_path_opa_to_ib(query->conv_pr, rec);
1590 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table),
1591 query->conv_pr, mad->data);
1592 } else {
1593 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table),
1594 rec, mad->data);
1595 }
1596
1597 *sa_query = &query->sa_query;
1598
1599 query->sa_query.flags |= IB_SA_ENABLE_LOCAL_SERVICE;
1600 query->sa_query.mad_buf->context[1] = (query->conv_pr) ?
1601 query->conv_pr : rec;
1602
1603 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1604 if (ret < 0)
1605 goto err3;
1606
1607 return ret;
1608
1609 err3:
1610 *sa_query = NULL;
1611 ib_sa_client_put(query->sa_query.client);
1612 free_mad(&query->sa_query);
1613 err2:
1614 kfree(query->conv_pr);
1615 err1:
1616 kfree(query);
1617 return ret;
1618 }
1619 EXPORT_SYMBOL(ib_sa_path_rec_get);
1620
ib_sa_mcmember_rec_callback(struct ib_sa_query * sa_query,int status,struct ib_sa_mad * mad)1621 static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
1622 int status, struct ib_sa_mad *mad)
1623 {
1624 struct ib_sa_mcmember_query *query =
1625 container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
1626
1627 if (mad) {
1628 struct ib_sa_mcmember_rec rec;
1629
1630 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
1631 mad->data, &rec);
1632 query->callback(status, &rec, query->context);
1633 } else
1634 query->callback(status, NULL, query->context);
1635 }
1636
ib_sa_mcmember_rec_release(struct ib_sa_query * sa_query)1637 static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
1638 {
1639 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
1640 }
1641
ib_sa_mcmember_rec_query(struct ib_sa_client * client,struct ib_device * device,u32 port_num,u8 method,struct ib_sa_mcmember_rec * rec,ib_sa_comp_mask comp_mask,unsigned long timeout_ms,gfp_t gfp_mask,void (* callback)(int status,struct ib_sa_mcmember_rec * resp,void * context),void * context,struct ib_sa_query ** sa_query)1642 int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
1643 struct ib_device *device, u32 port_num,
1644 u8 method,
1645 struct ib_sa_mcmember_rec *rec,
1646 ib_sa_comp_mask comp_mask,
1647 unsigned long timeout_ms, gfp_t gfp_mask,
1648 void (*callback)(int status,
1649 struct ib_sa_mcmember_rec *resp,
1650 void *context),
1651 void *context,
1652 struct ib_sa_query **sa_query)
1653 {
1654 struct ib_sa_mcmember_query *query;
1655 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1656 struct ib_sa_port *port;
1657 struct ib_mad_agent *agent;
1658 struct ib_sa_mad *mad;
1659 int ret;
1660
1661 if (!sa_dev)
1662 return -ENODEV;
1663
1664 port = &sa_dev->port[port_num - sa_dev->start_port];
1665 agent = port->agent;
1666
1667 query = kzalloc(sizeof(*query), gfp_mask);
1668 if (!query)
1669 return -ENOMEM;
1670
1671 query->sa_query.port = port;
1672 ret = alloc_mad(&query->sa_query, gfp_mask);
1673 if (ret)
1674 goto err1;
1675
1676 ib_sa_client_get(client);
1677 query->sa_query.client = client;
1678 query->callback = callback;
1679 query->context = context;
1680
1681 mad = query->sa_query.mad_buf->mad;
1682 init_mad(&query->sa_query, agent);
1683
1684 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
1685 query->sa_query.release = ib_sa_mcmember_rec_release;
1686 mad->mad_hdr.method = method;
1687 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
1688 mad->sa_hdr.comp_mask = comp_mask;
1689
1690 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
1691 rec, mad->data);
1692
1693 *sa_query = &query->sa_query;
1694
1695 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1696 if (ret < 0)
1697 goto err2;
1698
1699 return ret;
1700
1701 err2:
1702 *sa_query = NULL;
1703 ib_sa_client_put(query->sa_query.client);
1704 free_mad(&query->sa_query);
1705
1706 err1:
1707 kfree(query);
1708 return ret;
1709 }
1710
1711 /* Support GuidInfoRecord */
ib_sa_guidinfo_rec_callback(struct ib_sa_query * sa_query,int status,struct ib_sa_mad * mad)1712 static void ib_sa_guidinfo_rec_callback(struct ib_sa_query *sa_query,
1713 int status, struct ib_sa_mad *mad)
1714 {
1715 struct ib_sa_guidinfo_query *query =
1716 container_of(sa_query, struct ib_sa_guidinfo_query, sa_query);
1717
1718 if (mad) {
1719 struct ib_sa_guidinfo_rec rec;
1720
1721 ib_unpack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table),
1722 mad->data, &rec);
1723 query->callback(status, &rec, query->context);
1724 } else
1725 query->callback(status, NULL, query->context);
1726 }
1727
ib_sa_guidinfo_rec_release(struct ib_sa_query * sa_query)1728 static void ib_sa_guidinfo_rec_release(struct ib_sa_query *sa_query)
1729 {
1730 kfree(container_of(sa_query, struct ib_sa_guidinfo_query, sa_query));
1731 }
1732
ib_sa_guid_info_rec_query(struct ib_sa_client * client,struct ib_device * device,u32 port_num,struct ib_sa_guidinfo_rec * rec,ib_sa_comp_mask comp_mask,u8 method,unsigned long timeout_ms,gfp_t gfp_mask,void (* callback)(int status,struct ib_sa_guidinfo_rec * resp,void * context),void * context,struct ib_sa_query ** sa_query)1733 int ib_sa_guid_info_rec_query(struct ib_sa_client *client,
1734 struct ib_device *device, u32 port_num,
1735 struct ib_sa_guidinfo_rec *rec,
1736 ib_sa_comp_mask comp_mask, u8 method,
1737 unsigned long timeout_ms, gfp_t gfp_mask,
1738 void (*callback)(int status,
1739 struct ib_sa_guidinfo_rec *resp,
1740 void *context),
1741 void *context,
1742 struct ib_sa_query **sa_query)
1743 {
1744 struct ib_sa_guidinfo_query *query;
1745 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1746 struct ib_sa_port *port;
1747 struct ib_mad_agent *agent;
1748 struct ib_sa_mad *mad;
1749 int ret;
1750
1751 if (!sa_dev)
1752 return -ENODEV;
1753
1754 if (method != IB_MGMT_METHOD_GET &&
1755 method != IB_MGMT_METHOD_SET &&
1756 method != IB_SA_METHOD_DELETE) {
1757 return -EINVAL;
1758 }
1759
1760 port = &sa_dev->port[port_num - sa_dev->start_port];
1761 agent = port->agent;
1762
1763 query = kzalloc(sizeof(*query), gfp_mask);
1764 if (!query)
1765 return -ENOMEM;
1766
1767 query->sa_query.port = port;
1768 ret = alloc_mad(&query->sa_query, gfp_mask);
1769 if (ret)
1770 goto err1;
1771
1772 ib_sa_client_get(client);
1773 query->sa_query.client = client;
1774 query->callback = callback;
1775 query->context = context;
1776
1777 mad = query->sa_query.mad_buf->mad;
1778 init_mad(&query->sa_query, agent);
1779
1780 query->sa_query.callback = callback ? ib_sa_guidinfo_rec_callback : NULL;
1781 query->sa_query.release = ib_sa_guidinfo_rec_release;
1782
1783 mad->mad_hdr.method = method;
1784 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_GUID_INFO_REC);
1785 mad->sa_hdr.comp_mask = comp_mask;
1786
1787 ib_pack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table), rec,
1788 mad->data);
1789
1790 *sa_query = &query->sa_query;
1791
1792 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1793 if (ret < 0)
1794 goto err2;
1795
1796 return ret;
1797
1798 err2:
1799 *sa_query = NULL;
1800 ib_sa_client_put(query->sa_query.client);
1801 free_mad(&query->sa_query);
1802
1803 err1:
1804 kfree(query);
1805 return ret;
1806 }
1807 EXPORT_SYMBOL(ib_sa_guid_info_rec_query);
1808
1809 struct ib_classport_info_context {
1810 struct completion done;
1811 struct ib_sa_query *sa_query;
1812 };
1813
ib_classportinfo_cb(void * context)1814 static void ib_classportinfo_cb(void *context)
1815 {
1816 struct ib_classport_info_context *cb_ctx = context;
1817
1818 complete(&cb_ctx->done);
1819 }
1820
ib_sa_classport_info_rec_callback(struct ib_sa_query * sa_query,int status,struct ib_sa_mad * mad)1821 static void ib_sa_classport_info_rec_callback(struct ib_sa_query *sa_query,
1822 int status, struct ib_sa_mad *mad)
1823 {
1824 unsigned long flags;
1825 struct ib_sa_classport_info_query *query =
1826 container_of(sa_query, struct ib_sa_classport_info_query, sa_query);
1827 struct ib_sa_classport_cache *info = &sa_query->port->classport_info;
1828
1829 if (mad) {
1830 if (sa_query->flags & IB_SA_QUERY_OPA) {
1831 struct opa_class_port_info rec;
1832
1833 ib_unpack(opa_classport_info_rec_table,
1834 ARRAY_SIZE(opa_classport_info_rec_table),
1835 mad->data, &rec);
1836
1837 spin_lock_irqsave(&sa_query->port->classport_lock,
1838 flags);
1839 if (!status && !info->valid) {
1840 memcpy(&info->data.opa, &rec,
1841 sizeof(info->data.opa));
1842
1843 info->valid = true;
1844 info->data.type = RDMA_CLASS_PORT_INFO_OPA;
1845 }
1846 spin_unlock_irqrestore(&sa_query->port->classport_lock,
1847 flags);
1848
1849 } else {
1850 struct ib_class_port_info rec;
1851
1852 ib_unpack(ib_classport_info_rec_table,
1853 ARRAY_SIZE(ib_classport_info_rec_table),
1854 mad->data, &rec);
1855
1856 spin_lock_irqsave(&sa_query->port->classport_lock,
1857 flags);
1858 if (!status && !info->valid) {
1859 memcpy(&info->data.ib, &rec,
1860 sizeof(info->data.ib));
1861
1862 info->valid = true;
1863 info->data.type = RDMA_CLASS_PORT_INFO_IB;
1864 }
1865 spin_unlock_irqrestore(&sa_query->port->classport_lock,
1866 flags);
1867 }
1868 }
1869 query->callback(query->context);
1870 }
1871
ib_sa_classport_info_rec_release(struct ib_sa_query * sa_query)1872 static void ib_sa_classport_info_rec_release(struct ib_sa_query *sa_query)
1873 {
1874 kfree(container_of(sa_query, struct ib_sa_classport_info_query,
1875 sa_query));
1876 }
1877
ib_sa_classport_info_rec_query(struct ib_sa_port * port,unsigned long timeout_ms,void (* callback)(void * context),void * context,struct ib_sa_query ** sa_query)1878 static int ib_sa_classport_info_rec_query(struct ib_sa_port *port,
1879 unsigned long timeout_ms,
1880 void (*callback)(void *context),
1881 void *context,
1882 struct ib_sa_query **sa_query)
1883 {
1884 struct ib_mad_agent *agent;
1885 struct ib_sa_classport_info_query *query;
1886 struct ib_sa_mad *mad;
1887 gfp_t gfp_mask = GFP_KERNEL;
1888 int ret;
1889
1890 agent = port->agent;
1891
1892 query = kzalloc(sizeof(*query), gfp_mask);
1893 if (!query)
1894 return -ENOMEM;
1895
1896 query->sa_query.port = port;
1897 query->sa_query.flags |= rdma_cap_opa_ah(port->agent->device,
1898 port->port_num) ?
1899 IB_SA_QUERY_OPA : 0;
1900 ret = alloc_mad(&query->sa_query, gfp_mask);
1901 if (ret)
1902 goto err_free;
1903
1904 query->callback = callback;
1905 query->context = context;
1906
1907 mad = query->sa_query.mad_buf->mad;
1908 init_mad(&query->sa_query, agent);
1909
1910 query->sa_query.callback = ib_sa_classport_info_rec_callback;
1911 query->sa_query.release = ib_sa_classport_info_rec_release;
1912 mad->mad_hdr.method = IB_MGMT_METHOD_GET;
1913 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_CLASS_PORTINFO);
1914 mad->sa_hdr.comp_mask = 0;
1915 *sa_query = &query->sa_query;
1916
1917 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
1918 if (ret < 0)
1919 goto err_free_mad;
1920
1921 return ret;
1922
1923 err_free_mad:
1924 *sa_query = NULL;
1925 free_mad(&query->sa_query);
1926
1927 err_free:
1928 kfree(query);
1929 return ret;
1930 }
1931
update_ib_cpi(struct work_struct * work)1932 static void update_ib_cpi(struct work_struct *work)
1933 {
1934 struct ib_sa_port *port =
1935 container_of(work, struct ib_sa_port, ib_cpi_work.work);
1936 struct ib_classport_info_context *cb_context;
1937 unsigned long flags;
1938 int ret;
1939
1940 /* If the classport info is valid, nothing
1941 * to do here.
1942 */
1943 spin_lock_irqsave(&port->classport_lock, flags);
1944 if (port->classport_info.valid) {
1945 spin_unlock_irqrestore(&port->classport_lock, flags);
1946 return;
1947 }
1948 spin_unlock_irqrestore(&port->classport_lock, flags);
1949
1950 cb_context = kmalloc(sizeof(*cb_context), GFP_KERNEL);
1951 if (!cb_context)
1952 goto err_nomem;
1953
1954 init_completion(&cb_context->done);
1955
1956 ret = ib_sa_classport_info_rec_query(port, 3000,
1957 ib_classportinfo_cb, cb_context,
1958 &cb_context->sa_query);
1959 if (ret < 0)
1960 goto free_cb_err;
1961 wait_for_completion(&cb_context->done);
1962 free_cb_err:
1963 kfree(cb_context);
1964 spin_lock_irqsave(&port->classport_lock, flags);
1965
1966 /* If the classport info is still not valid, the query should have
1967 * failed for some reason. Retry issuing the query
1968 */
1969 if (!port->classport_info.valid) {
1970 port->classport_info.retry_cnt++;
1971 if (port->classport_info.retry_cnt <=
1972 IB_SA_CPI_MAX_RETRY_CNT) {
1973 unsigned long delay =
1974 msecs_to_jiffies(IB_SA_CPI_RETRY_WAIT);
1975
1976 queue_delayed_work(ib_wq, &port->ib_cpi_work, delay);
1977 }
1978 }
1979 spin_unlock_irqrestore(&port->classport_lock, flags);
1980
1981 err_nomem:
1982 return;
1983 }
1984
send_handler(struct ib_mad_agent * agent,struct ib_mad_send_wc * mad_send_wc)1985 static void send_handler(struct ib_mad_agent *agent,
1986 struct ib_mad_send_wc *mad_send_wc)
1987 {
1988 struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
1989 unsigned long flags;
1990
1991 if (query->callback)
1992 switch (mad_send_wc->status) {
1993 case IB_WC_SUCCESS:
1994 /* No callback -- already got recv */
1995 break;
1996 case IB_WC_RESP_TIMEOUT_ERR:
1997 query->callback(query, -ETIMEDOUT, NULL);
1998 break;
1999 case IB_WC_WR_FLUSH_ERR:
2000 query->callback(query, -EINTR, NULL);
2001 break;
2002 default:
2003 query->callback(query, -EIO, NULL);
2004 break;
2005 }
2006
2007 xa_lock_irqsave(&queries, flags);
2008 __xa_erase(&queries, query->id);
2009 xa_unlock_irqrestore(&queries, flags);
2010
2011 free_mad(query);
2012 if (query->client)
2013 ib_sa_client_put(query->client);
2014 query->release(query);
2015 }
2016
recv_handler(struct ib_mad_agent * mad_agent,struct ib_mad_send_buf * send_buf,struct ib_mad_recv_wc * mad_recv_wc)2017 static void recv_handler(struct ib_mad_agent *mad_agent,
2018 struct ib_mad_send_buf *send_buf,
2019 struct ib_mad_recv_wc *mad_recv_wc)
2020 {
2021 struct ib_sa_query *query;
2022
2023 if (!send_buf)
2024 return;
2025
2026 query = send_buf->context[0];
2027 if (query->callback) {
2028 if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
2029 query->callback(query,
2030 mad_recv_wc->recv_buf.mad->mad_hdr.status ?
2031 -EINVAL : 0,
2032 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
2033 else
2034 query->callback(query, -EIO, NULL);
2035 }
2036
2037 ib_free_recv_mad(mad_recv_wc);
2038 }
2039
update_sm_ah(struct work_struct * work)2040 static void update_sm_ah(struct work_struct *work)
2041 {
2042 struct ib_sa_port *port =
2043 container_of(work, struct ib_sa_port, update_task);
2044 struct ib_sa_sm_ah *new_ah;
2045 struct ib_port_attr port_attr;
2046 struct rdma_ah_attr ah_attr;
2047 bool grh_required;
2048
2049 if (ib_query_port(port->agent->device, port->port_num, &port_attr)) {
2050 pr_warn("Couldn't query port\n");
2051 return;
2052 }
2053
2054 new_ah = kmalloc(sizeof(*new_ah), GFP_KERNEL);
2055 if (!new_ah)
2056 return;
2057
2058 kref_init(&new_ah->ref);
2059 new_ah->src_path_mask = (1 << port_attr.lmc) - 1;
2060
2061 new_ah->pkey_index = 0;
2062 if (ib_find_pkey(port->agent->device, port->port_num,
2063 IB_DEFAULT_PKEY_FULL, &new_ah->pkey_index))
2064 pr_err("Couldn't find index for default PKey\n");
2065
2066 memset(&ah_attr, 0, sizeof(ah_attr));
2067 ah_attr.type = rdma_ah_find_type(port->agent->device,
2068 port->port_num);
2069 rdma_ah_set_dlid(&ah_attr, port_attr.sm_lid);
2070 rdma_ah_set_sl(&ah_attr, port_attr.sm_sl);
2071 rdma_ah_set_port_num(&ah_attr, port->port_num);
2072
2073 grh_required = rdma_is_grh_required(port->agent->device,
2074 port->port_num);
2075
2076 /*
2077 * The OPA sm_lid of 0xFFFF needs special handling so that it can be
2078 * differentiated from a permissive LID of 0xFFFF. We set the
2079 * grh_required flag here so the SA can program the DGID in the
2080 * address handle appropriately
2081 */
2082 if (ah_attr.type == RDMA_AH_ATTR_TYPE_OPA &&
2083 (grh_required ||
2084 port_attr.sm_lid == be16_to_cpu(IB_LID_PERMISSIVE)))
2085 rdma_ah_set_make_grd(&ah_attr, true);
2086
2087 if (ah_attr.type == RDMA_AH_ATTR_TYPE_IB && grh_required) {
2088 rdma_ah_set_ah_flags(&ah_attr, IB_AH_GRH);
2089 rdma_ah_set_subnet_prefix(&ah_attr,
2090 cpu_to_be64(port_attr.subnet_prefix));
2091 rdma_ah_set_interface_id(&ah_attr,
2092 cpu_to_be64(IB_SA_WELL_KNOWN_GUID));
2093 }
2094
2095 new_ah->ah = rdma_create_ah(port->agent->qp->pd, &ah_attr,
2096 RDMA_CREATE_AH_SLEEPABLE);
2097 if (IS_ERR(new_ah->ah)) {
2098 pr_warn("Couldn't create new SM AH\n");
2099 kfree(new_ah);
2100 return;
2101 }
2102
2103 spin_lock_irq(&port->ah_lock);
2104 if (port->sm_ah)
2105 kref_put(&port->sm_ah->ref, free_sm_ah);
2106 port->sm_ah = new_ah;
2107 spin_unlock_irq(&port->ah_lock);
2108 }
2109
ib_sa_event(struct ib_event_handler * handler,struct ib_event * event)2110 static void ib_sa_event(struct ib_event_handler *handler,
2111 struct ib_event *event)
2112 {
2113 if (event->event == IB_EVENT_PORT_ERR ||
2114 event->event == IB_EVENT_PORT_ACTIVE ||
2115 event->event == IB_EVENT_LID_CHANGE ||
2116 event->event == IB_EVENT_PKEY_CHANGE ||
2117 event->event == IB_EVENT_SM_CHANGE ||
2118 event->event == IB_EVENT_CLIENT_REREGISTER) {
2119 unsigned long flags;
2120 struct ib_sa_device *sa_dev =
2121 container_of(handler, typeof(*sa_dev), event_handler);
2122 u32 port_num = event->element.port_num - sa_dev->start_port;
2123 struct ib_sa_port *port = &sa_dev->port[port_num];
2124
2125 if (!rdma_cap_ib_sa(handler->device, port->port_num))
2126 return;
2127
2128 spin_lock_irqsave(&port->ah_lock, flags);
2129 if (port->sm_ah)
2130 kref_put(&port->sm_ah->ref, free_sm_ah);
2131 port->sm_ah = NULL;
2132 spin_unlock_irqrestore(&port->ah_lock, flags);
2133
2134 if (event->event == IB_EVENT_SM_CHANGE ||
2135 event->event == IB_EVENT_CLIENT_REREGISTER ||
2136 event->event == IB_EVENT_LID_CHANGE ||
2137 event->event == IB_EVENT_PORT_ACTIVE) {
2138 unsigned long delay =
2139 msecs_to_jiffies(IB_SA_CPI_RETRY_WAIT);
2140
2141 spin_lock_irqsave(&port->classport_lock, flags);
2142 port->classport_info.valid = false;
2143 port->classport_info.retry_cnt = 0;
2144 spin_unlock_irqrestore(&port->classport_lock, flags);
2145 queue_delayed_work(ib_wq,
2146 &port->ib_cpi_work, delay);
2147 }
2148 queue_work(ib_wq, &sa_dev->port[port_num].update_task);
2149 }
2150 }
2151
ib_sa_add_one(struct ib_device * device)2152 static int ib_sa_add_one(struct ib_device *device)
2153 {
2154 struct ib_sa_device *sa_dev;
2155 int s, e, i;
2156 int count = 0;
2157 int ret;
2158
2159 s = rdma_start_port(device);
2160 e = rdma_end_port(device);
2161
2162 sa_dev = kzalloc(struct_size(sa_dev, port, e - s + 1), GFP_KERNEL);
2163 if (!sa_dev)
2164 return -ENOMEM;
2165
2166 sa_dev->start_port = s;
2167 sa_dev->end_port = e;
2168
2169 for (i = 0; i <= e - s; ++i) {
2170 spin_lock_init(&sa_dev->port[i].ah_lock);
2171 if (!rdma_cap_ib_sa(device, i + 1))
2172 continue;
2173
2174 sa_dev->port[i].sm_ah = NULL;
2175 sa_dev->port[i].port_num = i + s;
2176
2177 spin_lock_init(&sa_dev->port[i].classport_lock);
2178 sa_dev->port[i].classport_info.valid = false;
2179
2180 sa_dev->port[i].agent =
2181 ib_register_mad_agent(device, i + s, IB_QPT_GSI,
2182 NULL, 0, send_handler,
2183 recv_handler, sa_dev, 0);
2184 if (IS_ERR(sa_dev->port[i].agent)) {
2185 ret = PTR_ERR(sa_dev->port[i].agent);
2186 goto err;
2187 }
2188
2189 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah);
2190 INIT_DELAYED_WORK(&sa_dev->port[i].ib_cpi_work,
2191 update_ib_cpi);
2192
2193 count++;
2194 }
2195
2196 if (!count) {
2197 ret = -EOPNOTSUPP;
2198 goto free;
2199 }
2200
2201 ib_set_client_data(device, &sa_client, sa_dev);
2202
2203 /*
2204 * We register our event handler after everything is set up,
2205 * and then update our cached info after the event handler is
2206 * registered to avoid any problems if a port changes state
2207 * during our initialization.
2208 */
2209
2210 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
2211 ib_register_event_handler(&sa_dev->event_handler);
2212
2213 for (i = 0; i <= e - s; ++i) {
2214 if (rdma_cap_ib_sa(device, i + 1))
2215 update_sm_ah(&sa_dev->port[i].update_task);
2216 }
2217
2218 return 0;
2219
2220 err:
2221 while (--i >= 0) {
2222 if (rdma_cap_ib_sa(device, i + 1))
2223 ib_unregister_mad_agent(sa_dev->port[i].agent);
2224 }
2225 free:
2226 kfree(sa_dev);
2227 return ret;
2228 }
2229
ib_sa_remove_one(struct ib_device * device,void * client_data)2230 static void ib_sa_remove_one(struct ib_device *device, void *client_data)
2231 {
2232 struct ib_sa_device *sa_dev = client_data;
2233 int i;
2234
2235 ib_unregister_event_handler(&sa_dev->event_handler);
2236 flush_workqueue(ib_wq);
2237
2238 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
2239 if (rdma_cap_ib_sa(device, i + 1)) {
2240 cancel_delayed_work_sync(&sa_dev->port[i].ib_cpi_work);
2241 ib_unregister_mad_agent(sa_dev->port[i].agent);
2242 if (sa_dev->port[i].sm_ah)
2243 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
2244 }
2245
2246 }
2247
2248 kfree(sa_dev);
2249 }
2250
ib_sa_init(void)2251 int ib_sa_init(void)
2252 {
2253 int ret;
2254
2255 get_random_bytes(&tid, sizeof tid);
2256
2257 atomic_set(&ib_nl_sa_request_seq, 0);
2258
2259 ret = ib_register_client(&sa_client);
2260 if (ret) {
2261 pr_err("Couldn't register ib_sa client\n");
2262 goto err1;
2263 }
2264
2265 ret = mcast_init();
2266 if (ret) {
2267 pr_err("Couldn't initialize multicast handling\n");
2268 goto err2;
2269 }
2270
2271 ib_nl_wq = alloc_ordered_workqueue("ib_nl_sa_wq", WQ_MEM_RECLAIM);
2272 if (!ib_nl_wq) {
2273 ret = -ENOMEM;
2274 goto err3;
2275 }
2276
2277 INIT_DELAYED_WORK(&ib_nl_timed_work, ib_nl_request_timeout);
2278
2279 return 0;
2280
2281 err3:
2282 mcast_cleanup();
2283 err2:
2284 ib_unregister_client(&sa_client);
2285 err1:
2286 return ret;
2287 }
2288
ib_sa_cleanup(void)2289 void ib_sa_cleanup(void)
2290 {
2291 cancel_delayed_work(&ib_nl_timed_work);
2292 destroy_workqueue(ib_nl_wq);
2293 mcast_cleanup();
2294 ib_unregister_client(&sa_client);
2295 WARN_ON(!xa_empty(&queries));
2296 }
2297
