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IPoIB: Recycle loopback skbs instead of freeing and reallocating
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / infiniband / core / sa_query.c
CommitLineData
1da177e4
LT		 1/*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
43506d95 3 * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
c1a0b23b 4 * Copyright (c) 2006 Intel Corporation. All rights reserved.
1da177e4
LT		 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 *
cbae32c5 34 * $Id: sa_query.c 2811 2005-07-06 18:11:43Z halr $
1da177e4
LT		 35 */
36
37#include <linux/module.h>
38#include <linux/init.h>
39#include <linux/err.h>
40#include <linux/random.h>
41#include <linux/spinlock.h>
42#include <linux/slab.h>
1da177e4
LT		 43#include <linux/dma-mapping.h>
44#include <linux/kref.h>
45#include <linux/idr.h>
4e57b681 46#include <linux/workqueue.h>
1da177e4 47
a4d61e84 48#include <rdma/ib_pack.h>
6d969a47 49#include <rdma/ib_cache.h>
faec2f7b 50#include "sa.h"
1da177e4
LT		 51
52MODULE_AUTHOR("Roland Dreier");
53MODULE_DESCRIPTION("InfiniBand subnet administration query support");
54MODULE_LICENSE("Dual BSD/GPL");
55
1da177e4
LT		 56struct ib_sa_sm_ah {
57 struct ib_ah *ah;
58 struct kref ref;
d0e7bb14 59 u8 src_path_mask;
1da177e4
LT		 60};
61
62struct ib_sa_port {
63 struct ib_mad_agent *agent;
1da177e4
LT		 64 struct ib_sa_sm_ah *sm_ah;
65 struct work_struct update_task;
66 spinlock_t ah_lock;
67 u8 port_num;
68};
69
70struct ib_sa_device {
71 int start_port, end_port;
72 struct ib_event_handler event_handler;
73 struct ib_sa_port port[0];
74};
75
76struct ib_sa_query {
77 void (*callback)(struct ib_sa_query *, int, struct ib_sa_mad *);
78 void (*release)(struct ib_sa_query *);
c1a0b23b 79 struct ib_sa_client *client;
34816ad9
SH		 80 struct ib_sa_port *port;
81 struct ib_mad_send_buf *mad_buf;
82 struct ib_sa_sm_ah *sm_ah;
83 int id;
1da177e4
LT		 84};
85
cbae32c5
HR		 86struct ib_sa_service_query {
87 void (*callback)(int, struct ib_sa_service_rec *, void *);
88 void *context;
89 struct ib_sa_query sa_query;
90};
91
1da177e4
LT		 92struct ib_sa_path_query {
93 void (*callback)(int, struct ib_sa_path_rec *, void *);
94 void *context;
95 struct ib_sa_query sa_query;
96};
97
98struct ib_sa_mcmember_query {
99 void (*callback)(int, struct ib_sa_mcmember_rec *, void *);
100 void *context;
101 struct ib_sa_query sa_query;
102};
103
104static void ib_sa_add_one(struct ib_device *device);
105static void ib_sa_remove_one(struct ib_device *device);
106
107static struct ib_client sa_client = {
108 .name = "sa",
109 .add = ib_sa_add_one,
110 .remove = ib_sa_remove_one
111};
112
113static spinlock_t idr_lock;
114static DEFINE_IDR(query_idr);
115
116static spinlock_t tid_lock;
117static u32 tid;
118
1da177e4
LT		 119#define PATH_REC_FIELD(field) \
120 .struct_offset_bytes = offsetof(struct ib_sa_path_rec, field), \
121 .struct_size_bytes = sizeof ((struct ib_sa_path_rec *) 0)->field, \
122 .field_name = "sa_path_rec:" #field
123
124static const struct ib_field path_rec_table[] = {
125 { RESERVED,
126 .offset_words = 0,
127 .offset_bits = 0,
128 .size_bits = 32 },
129 { RESERVED,
130 .offset_words = 1,
131 .offset_bits = 0,
132 .size_bits = 32 },
133 { PATH_REC_FIELD(dgid),
134 .offset_words = 2,
135 .offset_bits = 0,
136 .size_bits = 128 },
137 { PATH_REC_FIELD(sgid),
138 .offset_words = 6,
139 .offset_bits = 0,
140 .size_bits = 128 },
141 { PATH_REC_FIELD(dlid),
142 .offset_words = 10,
143 .offset_bits = 0,
144 .size_bits = 16 },
145 { PATH_REC_FIELD(slid),
146 .offset_words = 10,
147 .offset_bits = 16,
148 .size_bits = 16 },
149 { PATH_REC_FIELD(raw_traffic),
150 .offset_words = 11,
151 .offset_bits = 0,
152 .size_bits = 1 },
153 { RESERVED,
154 .offset_words = 11,
155 .offset_bits = 1,
156 .size_bits = 3 },
157 { PATH_REC_FIELD(flow_label),
158 .offset_words = 11,
159 .offset_bits = 4,
160 .size_bits = 20 },
161 { PATH_REC_FIELD(hop_limit),
162 .offset_words = 11,
163 .offset_bits = 24,
164 .size_bits = 8 },
165 { PATH_REC_FIELD(traffic_class),
166 .offset_words = 12,
167 .offset_bits = 0,
168 .size_bits = 8 },
169 { PATH_REC_FIELD(reversible),
170 .offset_words = 12,
171 .offset_bits = 8,
172 .size_bits = 1 },
173 { PATH_REC_FIELD(numb_path),
174 .offset_words = 12,
175 .offset_bits = 9,
176 .size_bits = 7 },
177 { PATH_REC_FIELD(pkey),
178 .offset_words = 12,
179 .offset_bits = 16,
180 .size_bits = 16 },
181 { RESERVED,
182 .offset_words = 13,
183 .offset_bits = 0,
184 .size_bits = 12 },
185 { PATH_REC_FIELD(sl),
186 .offset_words = 13,
187 .offset_bits = 12,
188 .size_bits = 4 },
189 { PATH_REC_FIELD(mtu_selector),
190 .offset_words = 13,
191 .offset_bits = 16,
192 .size_bits = 2 },
193 { PATH_REC_FIELD(mtu),
194 .offset_words = 13,
195 .offset_bits = 18,
196 .size_bits = 6 },
197 { PATH_REC_FIELD(rate_selector),
198 .offset_words = 13,
199 .offset_bits = 24,
200 .size_bits = 2 },
201 { PATH_REC_FIELD(rate),
202 .offset_words = 13,
203 .offset_bits = 26,
204 .size_bits = 6 },
205 { PATH_REC_FIELD(packet_life_time_selector),
206 .offset_words = 14,
207 .offset_bits = 0,
208 .size_bits = 2 },
209 { PATH_REC_FIELD(packet_life_time),
210 .offset_words = 14,
211 .offset_bits = 2,
212 .size_bits = 6 },
213 { PATH_REC_FIELD(preference),
214 .offset_words = 14,
215 .offset_bits = 8,
216 .size_bits = 8 },
217 { RESERVED,
218 .offset_words = 14,
219 .offset_bits = 16,
220 .size_bits = 48 },
221};
222
223#define MCMEMBER_REC_FIELD(field) \
224 .struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field), \
225 .struct_size_bytes = sizeof ((struct ib_sa_mcmember_rec *) 0)->field, \
226 .field_name = "sa_mcmember_rec:" #field
227
228static const struct ib_field mcmember_rec_table[] = {
229 { MCMEMBER_REC_FIELD(mgid),
230 .offset_words = 0,
231 .offset_bits = 0,
232 .size_bits = 128 },
233 { MCMEMBER_REC_FIELD(port_gid),
234 .offset_words = 4,
235 .offset_bits = 0,
236 .size_bits = 128 },
237 { MCMEMBER_REC_FIELD(qkey),
238 .offset_words = 8,
239 .offset_bits = 0,
240 .size_bits = 32 },
241 { MCMEMBER_REC_FIELD(mlid),
242 .offset_words = 9,
243 .offset_bits = 0,
244 .size_bits = 16 },
245 { MCMEMBER_REC_FIELD(mtu_selector),
246 .offset_words = 9,
247 .offset_bits = 16,
248 .size_bits = 2 },
249 { MCMEMBER_REC_FIELD(mtu),
250 .offset_words = 9,
251 .offset_bits = 18,
252 .size_bits = 6 },
253 { MCMEMBER_REC_FIELD(traffic_class),
254 .offset_words = 9,
255 .offset_bits = 24,
256 .size_bits = 8 },
257 { MCMEMBER_REC_FIELD(pkey),
258 .offset_words = 10,
259 .offset_bits = 0,
260 .size_bits = 16 },
261 { MCMEMBER_REC_FIELD(rate_selector),
262 .offset_words = 10,
263 .offset_bits = 16,
264 .size_bits = 2 },
265 { MCMEMBER_REC_FIELD(rate),
266 .offset_words = 10,
267 .offset_bits = 18,
268 .size_bits = 6 },
269 { MCMEMBER_REC_FIELD(packet_life_time_selector),
270 .offset_words = 10,
271 .offset_bits = 24,
272 .size_bits = 2 },
273 { MCMEMBER_REC_FIELD(packet_life_time),
274 .offset_words = 10,
275 .offset_bits = 26,
276 .size_bits = 6 },
277 { MCMEMBER_REC_FIELD(sl),
278 .offset_words = 11,
279 .offset_bits = 0,
280 .size_bits = 4 },
281 { MCMEMBER_REC_FIELD(flow_label),
282 .offset_words = 11,
283 .offset_bits = 4,
284 .size_bits = 20 },
285 { MCMEMBER_REC_FIELD(hop_limit),
286 .offset_words = 11,
287 .offset_bits = 24,
288 .size_bits = 8 },
289 { MCMEMBER_REC_FIELD(scope),
290 .offset_words = 12,
291 .offset_bits = 0,
292 .size_bits = 4 },
293 { MCMEMBER_REC_FIELD(join_state),
294 .offset_words = 12,
295 .offset_bits = 4,
296 .size_bits = 4 },
297 { MCMEMBER_REC_FIELD(proxy_join),
298 .offset_words = 12,
299 .offset_bits = 8,
300 .size_bits = 1 },
301 { RESERVED,
302 .offset_words = 12,
303 .offset_bits = 9,
304 .size_bits = 23 },
305};
306
cbae32c5
HR		 307#define SERVICE_REC_FIELD(field) \
308 .struct_offset_bytes = offsetof(struct ib_sa_service_rec, field), \
309 .struct_size_bytes = sizeof ((struct ib_sa_service_rec *) 0)->field, \
310 .field_name = "sa_service_rec:" #field
311
312static const struct ib_field service_rec_table[] = {
313 { SERVICE_REC_FIELD(id),
314 .offset_words = 0,
315 .offset_bits = 0,
316 .size_bits = 64 },
317 { SERVICE_REC_FIELD(gid),
318 .offset_words = 2,
319 .offset_bits = 0,
320 .size_bits = 128 },
321 { SERVICE_REC_FIELD(pkey),
322 .offset_words = 6,
323 .offset_bits = 0,
324 .size_bits = 16 },
325 { SERVICE_REC_FIELD(lease),
326 .offset_words = 7,
327 .offset_bits = 0,
328 .size_bits = 32 },
329 { SERVICE_REC_FIELD(key),
330 .offset_words = 8,
331 .offset_bits = 0,
332 .size_bits = 128 },
333 { SERVICE_REC_FIELD(name),
334 .offset_words = 12,
335 .offset_bits = 0,
336 .size_bits = 64*8 },
337 { SERVICE_REC_FIELD(data8),
338 .offset_words = 28,
339 .offset_bits = 0,
340 .size_bits = 16*8 },
341 { SERVICE_REC_FIELD(data16),
342 .offset_words = 32,
343 .offset_bits = 0,
344 .size_bits = 8*16 },
345 { SERVICE_REC_FIELD(data32),
346 .offset_words = 36,
347 .offset_bits = 0,
348 .size_bits = 4*32 },
349 { SERVICE_REC_FIELD(data64),
350 .offset_words = 40,
351 .offset_bits = 0,
352 .size_bits = 2*64 },
353};
354
1da177e4
LT		 355static void free_sm_ah(struct kref *kref)
356{
357 struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref);
358
359 ib_destroy_ah(sm_ah->ah);
360 kfree(sm_ah);
361}
362
c4028958 363static void update_sm_ah(struct work_struct *work)
1da177e4 364{
c4028958
DH		 365 struct ib_sa_port *port =
366 container_of(work, struct ib_sa_port, update_task);
1da177e4
LT		 367 struct ib_sa_sm_ah *new_ah, *old_ah;
368 struct ib_port_attr port_attr;
369 struct ib_ah_attr ah_attr;
370
371 if (ib_query_port(port->agent->device, port->port_num, &port_attr)) {
372 printk(KERN_WARNING "Couldn't query port\n");
373 return;
374 }
375
376 new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL);
377 if (!new_ah) {
378 printk(KERN_WARNING "Couldn't allocate new SM AH\n");
379 return;
380 }
381
382 kref_init(&new_ah->ref);
d0e7bb14 383 new_ah->src_path_mask = (1 << port_attr.lmc) - 1;
1da177e4
LT		 384
385 memset(&ah_attr, 0, sizeof ah_attr);
386 ah_attr.dlid = port_attr.sm_lid;
387 ah_attr.sl = port_attr.sm_sl;
388 ah_attr.port_num = port->port_num;
389
390 new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr);
391 if (IS_ERR(new_ah->ah)) {
392 printk(KERN_WARNING "Couldn't create new SM AH\n");
393 kfree(new_ah);
394 return;
395 }
396
397 spin_lock_irq(&port->ah_lock);
398 old_ah = port->sm_ah;
399 port->sm_ah = new_ah;
400 spin_unlock_irq(&port->ah_lock);
401
402 if (old_ah)
403 kref_put(&old_ah->ref, free_sm_ah);
404}
405
406static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event)
407{
408 if (event->event == IB_EVENT_PORT_ERR ||
409 event->event == IB_EVENT_PORT_ACTIVE ||
410 event->event == IB_EVENT_LID_CHANGE ||
411 event->event == IB_EVENT_PKEY_CHANGE ||
acaea9ee
JM		 412 event->event == IB_EVENT_SM_CHANGE ||
413 event->event == IB_EVENT_CLIENT_REREGISTER) {
1d6801f9
MT		 414 struct ib_sa_device *sa_dev;
415 sa_dev = container_of(handler, typeof(*sa_dev), event_handler);
1da177e4
LT		 416
417 schedule_work(&sa_dev->port[event->element.port_num -
418 sa_dev->start_port].update_task);
419 }
420}
421
c1a0b23b
MT		 422void ib_sa_register_client(struct ib_sa_client *client)
423{
424 atomic_set(&client->users, 1);
425 init_completion(&client->comp);
426}
427EXPORT_SYMBOL(ib_sa_register_client);
428
c1a0b23b
MT		 429void ib_sa_unregister_client(struct ib_sa_client *client)
430{
431 ib_sa_client_put(client);
432 wait_for_completion(&client->comp);
433}
434EXPORT_SYMBOL(ib_sa_unregister_client);
435
1da177e4
LT		 436/**
437 * ib_sa_cancel_query - try to cancel an SA query
438 * @id:ID of query to cancel
439 * @query:query pointer to cancel
440 *
441 * Try to cancel an SA query. If the id and query don't match up or
442 * the query has already completed, nothing is done. Otherwise the
443 * query is canceled and will complete with a status of -EINTR.
444 */
445void ib_sa_cancel_query(int id, struct ib_sa_query *query)
446{
447 unsigned long flags;
448 struct ib_mad_agent *agent;
34816ad9 449 struct ib_mad_send_buf *mad_buf;
1da177e4
LT		 450
451 spin_lock_irqsave(&idr_lock, flags);
452 if (idr_find(&query_idr, id) != query) {
453 spin_unlock_irqrestore(&idr_lock, flags);
454 return;
455 }
456 agent = query->port->agent;
34816ad9 457 mad_buf = query->mad_buf;
1da177e4
LT		 458 spin_unlock_irqrestore(&idr_lock, flags);
459
34816ad9 460 ib_cancel_mad(agent, mad_buf);
1da177e4
LT		 461}
462EXPORT_SYMBOL(ib_sa_cancel_query);
463
d0e7bb14
SH		 464static u8 get_src_path_mask(struct ib_device *device, u8 port_num)
465{
466 struct ib_sa_device *sa_dev;
467 struct ib_sa_port *port;
468 unsigned long flags;
469 u8 src_path_mask;
470
471 sa_dev = ib_get_client_data(device, &sa_client);
472 if (!sa_dev)
473 return 0x7f;
474
475 port = &sa_dev->port[port_num - sa_dev->start_port];
476 spin_lock_irqsave(&port->ah_lock, flags);
477 src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f;
478 spin_unlock_irqrestore(&port->ah_lock, flags);
479
480 return src_path_mask;
481}
482
6d969a47
SH		 483int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
484 struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr)
485{
486 int ret;
487 u16 gid_index;
488
489 memset(ah_attr, 0, sizeof *ah_attr);
490 ah_attr->dlid = be16_to_cpu(rec->dlid);
491 ah_attr->sl = rec->sl;
d0e7bb14
SH		 492 ah_attr->src_path_bits = be16_to_cpu(rec->slid) &
493 get_src_path_mask(device, port_num);
6d969a47 494 ah_attr->port_num = port_num;
7084f842 495 ah_attr->static_rate = rec->rate;
6d969a47
SH		 496
497 if (rec->hop_limit > 1) {
498 ah_attr->ah_flags = IB_AH_GRH;
499 ah_attr->grh.dgid = rec->dgid;
500
501 ret = ib_find_cached_gid(device, &rec->sgid, &port_num,
502 &gid_index);
503 if (ret)
504 return ret;
505
ca222c6b
SH		 506 ah_attr->grh.sgid_index = gid_index;
507 ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
508 ah_attr->grh.hop_limit = rec->hop_limit;
6d969a47
SH		 509 ah_attr->grh.traffic_class = rec->traffic_class;
510 }
511 return 0;
512}
513EXPORT_SYMBOL(ib_init_ah_from_path);
514
1da177e4
LT		 515static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
516{
517 unsigned long flags;
518
519 memset(mad, 0, sizeof *mad);
520
521 mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION;
522 mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
523 mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
524
525 spin_lock_irqsave(&tid_lock, flags);
526 mad->mad_hdr.tid =
527 cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
528 spin_unlock_irqrestore(&tid_lock, flags);
529}
530
e322fedf 531static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask)
1da177e4 532{
1da177e4 533 unsigned long flags;
34816ad9 534 int ret, id;
1da177e4
LT		 535
536retry:
e322fedf 537 if (!idr_pre_get(&query_idr, gfp_mask))
1da177e4
LT		 538 return -ENOMEM;
539 spin_lock_irqsave(&idr_lock, flags);
34816ad9 540 ret = idr_get_new(&query_idr, query, &id);
1da177e4
LT		 541 spin_unlock_irqrestore(&idr_lock, flags);
542 if (ret == -EAGAIN)
543 goto retry;
544 if (ret)
545 return ret;
546
34816ad9
SH		 547 query->mad_buf->timeout_ms = timeout_ms;
548 query->mad_buf->context[0] = query;
549 query->id = id;
1da177e4 550
34816ad9
SH		 551 spin_lock_irqsave(&query->port->ah_lock, flags);
552 kref_get(&query->port->sm_ah->ref);
553 query->sm_ah = query->port->sm_ah;
554 spin_unlock_irqrestore(&query->port->ah_lock, flags);
1da177e4 555
34816ad9 556 query->mad_buf->ah = query->sm_ah->ah;
1da177e4 557
34816ad9 558 ret = ib_post_send_mad(query->mad_buf, NULL);
1da177e4 559 if (ret) {
1da177e4 560 spin_lock_irqsave(&idr_lock, flags);
34816ad9 561 idr_remove(&query_idr, id);
1da177e4 562 spin_unlock_irqrestore(&idr_lock, flags);
34816ad9
SH		 563
564 kref_put(&query->sm_ah->ref, free_sm_ah);
1da177e4
LT		 565 }
566
dae4c1d2
RD		 567 /*
568 * It's not safe to dereference query any more, because the
569 * send may already have completed and freed the query in
34816ad9 570 * another context.
dae4c1d2 571 */
34816ad9 572 return ret ? ret : id;
1da177e4
LT		 573}
574
575static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
576 int status,
577 struct ib_sa_mad *mad)
578{
579 struct ib_sa_path_query *query =
580 container_of(sa_query, struct ib_sa_path_query, sa_query);
581
582 if (mad) {
583 struct ib_sa_path_rec rec;
584
585 ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
586 mad->data, &rec);
587 query->callback(status, &rec, query->context);
588 } else
589 query->callback(status, NULL, query->context);
590}
591
592static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
593{
1da177e4
LT		 594 kfree(container_of(sa_query, struct ib_sa_path_query, sa_query));
595}
596
597/**
598 * ib_sa_path_rec_get - Start a Path get query
c1a0b23b 599 * @client:SA client
1da177e4
LT		 600 * @device:device to send query on
601 * @port_num: port number to send query on
602 * @rec:Path Record to send in query
603 * @comp_mask:component mask to send in query
604 * @timeout_ms:time to wait for response
605 * @gfp_mask:GFP mask to use for internal allocations
606 * @callback:function called when query completes, times out or is
607 * canceled
608 * @context:opaque user context passed to callback
609 * @sa_query:query context, used to cancel query
610 *
611 * Send a Path Record Get query to the SA to look up a path. The
612 * callback function will be called when the query completes (or
613 * fails); status is 0 for a successful response, -EINTR if the query
614 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
615 * occurred sending the query. The resp parameter of the callback is
616 * only valid if status is 0.
617 *
618 * If the return value of ib_sa_path_rec_get() is negative, it is an
619 * error code. Otherwise it is a query ID that can be used to cancel
620 * the query.
621 */
c1a0b23b
MT		 622int ib_sa_path_rec_get(struct ib_sa_client *client,
623 struct ib_device *device, u8 port_num,
1da177e4
LT		 624 struct ib_sa_path_rec *rec,
625 ib_sa_comp_mask comp_mask,
dd0fc66f 626 int timeout_ms, gfp_t gfp_mask,
1da177e4
LT		 627 void (*callback)(int status,
628 struct ib_sa_path_rec *resp,
629 void *context),
630 void *context,
631 struct ib_sa_query **sa_query)
632{
633 struct ib_sa_path_query *query;
634 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
56c202d6
RD		 635 struct ib_sa_port *port;
636 struct ib_mad_agent *agent;
34816ad9 637 struct ib_sa_mad *mad;
1da177e4
LT		 638 int ret;
639
56c202d6
RD		 640 if (!sa_dev)
641 return -ENODEV;
642
643 port = &sa_dev->port[port_num - sa_dev->start_port];
644 agent = port->agent;
645
1da177e4
LT		 646 query = kmalloc(sizeof *query, gfp_mask);
647 if (!query)
648 return -ENOMEM;
34816ad9
SH		 649
650 query->sa_query.mad_buf = ib_create_send_mad(agent, 1, 0,
651 0, IB_MGMT_SA_HDR,
652 IB_MGMT_SA_DATA, gfp_mask);
653 if (!query->sa_query.mad_buf) {
654 ret = -ENOMEM;
655 goto err1;
1da177e4
LT		 656 }
657
c1a0b23b
MT		 658 ib_sa_client_get(client);
659 query->sa_query.client = client;
660 query->callback = callback;
661 query->context = context;
1da177e4 662
34816ad9
SH		 663 mad = query->sa_query.mad_buf->mad;
664 init_mad(mad, agent);
1da177e4 665
34816ad9
SH		 666 query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
667 query->sa_query.release = ib_sa_path_rec_release;
668 query->sa_query.port = port;
669 mad->mad_hdr.method = IB_MGMT_METHOD_GET;
670 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC);
671 mad->sa_hdr.comp_mask = comp_mask;
1da177e4 672
34816ad9 673 ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data);
1da177e4
LT		 674
675 *sa_query = &query->sa_query;
dae4c1d2 676
e322fedf 677 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
34816ad9
SH		 678 if (ret < 0)
679 goto err2;
680
681 return ret;
682
683err2:
684 *sa_query = NULL;
c1a0b23b 685 ib_sa_client_put(query->sa_query.client);
34816ad9 686 ib_free_send_mad(query->sa_query.mad_buf);
1da177e4 687
34816ad9
SH		 688err1:
689 kfree(query);
dae4c1d2 690 return ret;
1da177e4
LT		 691}
692EXPORT_SYMBOL(ib_sa_path_rec_get);
693
cbae32c5
HR		 694static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query,
695 int status,
696 struct ib_sa_mad *mad)
697{
698 struct ib_sa_service_query *query =
699 container_of(sa_query, struct ib_sa_service_query, sa_query);
700
701 if (mad) {
702 struct ib_sa_service_rec rec;
703
704 ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table),
705 mad->data, &rec);
706 query->callback(status, &rec, query->context);
707 } else
708 query->callback(status, NULL, query->context);
709}
710
711static void ib_sa_service_rec_release(struct ib_sa_query *sa_query)
712{
cbae32c5
HR		 713 kfree(container_of(sa_query, struct ib_sa_service_query, sa_query));
714}
715
716/**
717 * ib_sa_service_rec_query - Start Service Record operation
c1a0b23b 718 * @client:SA client
cbae32c5
HR		 719 * @device:device to send request on
720 * @port_num: port number to send request on
721 * @method:SA method - should be get, set, or delete
722 * @rec:Service Record to send in request
723 * @comp_mask:component mask to send in request
724 * @timeout_ms:time to wait for response
725 * @gfp_mask:GFP mask to use for internal allocations
726 * @callback:function called when request completes, times out or is
727 * canceled
728 * @context:opaque user context passed to callback
729 * @sa_query:request context, used to cancel request
730 *
731 * Send a Service Record set/get/delete to the SA to register,
732 * unregister or query a service record.
733 * The callback function will be called when the request completes (or
734 * fails); status is 0 for a successful response, -EINTR if the query
735 * is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
736 * occurred sending the query. The resp parameter of the callback is
737 * only valid if status is 0.
738 *
739 * If the return value of ib_sa_service_rec_query() is negative, it is an
740 * error code. Otherwise it is a request ID that can be used to cancel
741 * the query.
742 */
c1a0b23b
MT		 743int ib_sa_service_rec_query(struct ib_sa_client *client,
744 struct ib_device *device, u8 port_num, u8 method,
cbae32c5
HR		 745 struct ib_sa_service_rec *rec,
746 ib_sa_comp_mask comp_mask,
dd0fc66f 747 int timeout_ms, gfp_t gfp_mask,
cbae32c5
HR		 748 void (*callback)(int status,
749 struct ib_sa_service_rec *resp,
750 void *context),
751 void *context,
752 struct ib_sa_query **sa_query)
753{
754 struct ib_sa_service_query *query;
755 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
56c202d6
RD		 756 struct ib_sa_port *port;
757 struct ib_mad_agent *agent;
34816ad9 758 struct ib_sa_mad *mad;
cbae32c5
HR		 759 int ret;
760
56c202d6
RD		 761 if (!sa_dev)
762 return -ENODEV;
763
764 port = &sa_dev->port[port_num - sa_dev->start_port];
765 agent = port->agent;
766
cbae32c5
HR		 767 if (method != IB_MGMT_METHOD_GET &&
768 method != IB_MGMT_METHOD_SET &&
769 method != IB_SA_METHOD_DELETE)
770 return -EINVAL;
771
772 query = kmalloc(sizeof *query, gfp_mask);
773 if (!query)
774 return -ENOMEM;
34816ad9
SH		 775
776 query->sa_query.mad_buf = ib_create_send_mad(agent, 1, 0,
777 0, IB_MGMT_SA_HDR,
778 IB_MGMT_SA_DATA, gfp_mask);
779 if (!query->sa_query.mad_buf) {
780 ret = -ENOMEM;
781 goto err1;
cbae32c5
HR		 782 }
783
c1a0b23b
MT		 784 ib_sa_client_get(client);
785 query->sa_query.client = client;
786 query->callback = callback;
787 query->context = context;
cbae32c5 788
34816ad9
SH		 789 mad = query->sa_query.mad_buf->mad;
790 init_mad(mad, agent);
cbae32c5 791
34816ad9
SH		 792 query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
793 query->sa_query.release = ib_sa_service_rec_release;
794 query->sa_query.port = port;
795 mad->mad_hdr.method = method;
796 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
797 mad->sa_hdr.comp_mask = comp_mask;
cbae32c5
HR		 798
799 ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table),
34816ad9 800 rec, mad->data);
cbae32c5
HR		 801
802 *sa_query = &query->sa_query;
803
e322fedf 804 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
34816ad9
SH		 805 if (ret < 0)
806 goto err2;
807
808 return ret;
cbae32c5 809
34816ad9
SH		 810err2:
811 *sa_query = NULL;
c1a0b23b 812 ib_sa_client_put(query->sa_query.client);
34816ad9
SH		 813 ib_free_send_mad(query->sa_query.mad_buf);
814
815err1:
816 kfree(query);
cbae32c5
HR		 817 return ret;
818}
819EXPORT_SYMBOL(ib_sa_service_rec_query);
820
1da177e4
LT		 821static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
822 int status,
823 struct ib_sa_mad *mad)
824{
825 struct ib_sa_mcmember_query *query =
826 container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
827
828 if (mad) {
829 struct ib_sa_mcmember_rec rec;
830
831 ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
832 mad->data, &rec);
833 query->callback(status, &rec, query->context);
834 } else
835 query->callback(status, NULL, query->context);
836}
837
838static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
839{
1da177e4
LT		 840 kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
841}
842
c1a0b23b
MT		 843int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
844 struct ib_device *device, u8 port_num,
1da177e4
LT		 845 u8 method,
846 struct ib_sa_mcmember_rec *rec,
847 ib_sa_comp_mask comp_mask,
dd0fc66f 848 int timeout_ms, gfp_t gfp_mask,
1da177e4
LT		 849 void (*callback)(int status,
850 struct ib_sa_mcmember_rec *resp,
851 void *context),
852 void *context,
853 struct ib_sa_query **sa_query)
854{
855 struct ib_sa_mcmember_query *query;
856 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
56c202d6
RD		 857 struct ib_sa_port *port;
858 struct ib_mad_agent *agent;
34816ad9 859 struct ib_sa_mad *mad;
1da177e4
LT		 860 int ret;
861
56c202d6
RD		 862 if (!sa_dev)
863 return -ENODEV;
864
865 port = &sa_dev->port[port_num - sa_dev->start_port];
866 agent = port->agent;
867
1da177e4
LT		 868 query = kmalloc(sizeof *query, gfp_mask);
869 if (!query)
870 return -ENOMEM;
34816ad9
SH		 871
872 query->sa_query.mad_buf = ib_create_send_mad(agent, 1, 0,
873 0, IB_MGMT_SA_HDR,
874 IB_MGMT_SA_DATA, gfp_mask);
875 if (!query->sa_query.mad_buf) {
876 ret = -ENOMEM;
877 goto err1;
1da177e4
LT		 878 }
879
c1a0b23b
MT		 880 ib_sa_client_get(client);
881 query->sa_query.client = client;
882 query->callback = callback;
883 query->context = context;
1da177e4 884
34816ad9
SH		 885 mad = query->sa_query.mad_buf->mad;
886 init_mad(mad, agent);
1da177e4 887
34816ad9
SH		 888 query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
889 query->sa_query.release = ib_sa_mcmember_rec_release;
890 query->sa_query.port = port;
891 mad->mad_hdr.method = method;
892 mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
893 mad->sa_hdr.comp_mask = comp_mask;
1da177e4
LT		 894
895 ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
34816ad9 896 rec, mad->data);
1da177e4
LT		 897
898 *sa_query = &query->sa_query;
dae4c1d2 899
e322fedf 900 ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
34816ad9
SH		 901 if (ret < 0)
902 goto err2;
1da177e4 903
dae4c1d2 904 return ret;
34816ad9
SH		 905
906err2:
907 *sa_query = NULL;
c1a0b23b 908 ib_sa_client_put(query->sa_query.client);
34816ad9
SH		 909 ib_free_send_mad(query->sa_query.mad_buf);
910
911err1:
912 kfree(query);
913 return ret;
1da177e4 914}
1da177e4
LT		 915
916static void send_handler(struct ib_mad_agent *agent,
917 struct ib_mad_send_wc *mad_send_wc)
918{
34816ad9 919 struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
1da177e4
LT		 920 unsigned long flags;
921
e4f50f00
RD		 922 if (query->callback)
923 switch (mad_send_wc->status) {
924 case IB_WC_SUCCESS:
925 /* No callback -- already got recv */
926 break;
927 case IB_WC_RESP_TIMEOUT_ERR:
928 query->callback(query, -ETIMEDOUT, NULL);
929 break;
930 case IB_WC_WR_FLUSH_ERR:
931 query->callback(query, -EINTR, NULL);
932 break;
933 default:
934 query->callback(query, -EIO, NULL);
935 break;
936 }
1da177e4 937
1da177e4 938 spin_lock_irqsave(&idr_lock, flags);
34816ad9 939 idr_remove(&query_idr, query->id);
1da177e4 940 spin_unlock_irqrestore(&idr_lock, flags);
34816ad9 941
3cd96564 942 ib_free_send_mad(mad_send_wc->send_buf);
34816ad9 943 kref_put(&query->sm_ah->ref, free_sm_ah);
c1a0b23b 944 ib_sa_client_put(query->client);
34816ad9 945 query->release(query);
1da177e4
LT		 946}
947
948static void recv_handler(struct ib_mad_agent *mad_agent,
949 struct ib_mad_recv_wc *mad_recv_wc)
950{
951 struct ib_sa_query *query;
34816ad9 952 struct ib_mad_send_buf *mad_buf;
1da177e4 953
34816ad9
SH		 954 mad_buf = (void *) (unsigned long) mad_recv_wc->wc->wr_id;
955 query = mad_buf->context[0];
1da177e4 956
34816ad9 957 if (query->callback) {
1da177e4
LT		 958 if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
959 query->callback(query,
960 mad_recv_wc->recv_buf.mad->mad_hdr.status ?
961 -EINVAL : 0,
962 (struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
963 else
964 query->callback(query, -EIO, NULL);
965 }
966
967 ib_free_recv_mad(mad_recv_wc);
968}
969
970static void ib_sa_add_one(struct ib_device *device)
971{
972 struct ib_sa_device *sa_dev;
973 int s, e, i;
974
07ebafba
TT		 975 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
976 return;
977
978 if (device->node_type == RDMA_NODE_IB_SWITCH)
1da177e4
LT		 979 s = e = 0;
980 else {
981 s = 1;
982 e = device->phys_port_cnt;
983 }
984
985 sa_dev = kmalloc(sizeof *sa_dev +
986 (e - s + 1) * sizeof (struct ib_sa_port),
987 GFP_KERNEL);
988 if (!sa_dev)
989 return;
990
991 sa_dev->start_port = s;
992 sa_dev->end_port = e;
993
994 for (i = 0; i <= e - s; ++i) {
1da177e4
LT		 995 sa_dev->port[i].sm_ah = NULL;
996 sa_dev->port[i].port_num = i + s;
997 spin_lock_init(&sa_dev->port[i].ah_lock);
998
999 sa_dev->port[i].agent =
1000 ib_register_mad_agent(device, i + s, IB_QPT_GSI,
1001 NULL, 0, send_handler,
1002 recv_handler, sa_dev);
1003 if (IS_ERR(sa_dev->port[i].agent))
1004 goto err;
1005
c4028958 1006 INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah);
1da177e4
LT		 1007 }
1008
1009 ib_set_client_data(device, &sa_client, sa_dev);
1010
1011 /*
1012 * We register our event handler after everything is set up,
1013 * and then update our cached info after the event handler is
1014 * registered to avoid any problems if a port changes state
1015 * during our initialization.
1016 */
1017
1018 INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
1019 if (ib_register_event_handler(&sa_dev->event_handler))
1020 goto err;
1021
1022 for (i = 0; i <= e - s; ++i)
c4028958 1023 update_sm_ah(&sa_dev->port[i].update_task);
1da177e4
LT		 1024
1025 return;
1026
1027err:
b82cab6b 1028 while (--i >= 0)
1da177e4 1029 ib_unregister_mad_agent(sa_dev->port[i].agent);
1da177e4
LT		 1030
1031 kfree(sa_dev);
1032
1033 return;
1034}
1035
1036static void ib_sa_remove_one(struct ib_device *device)
1037{
1038 struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
1039 int i;
1040
1041 if (!sa_dev)
1042 return;
1043
1044 ib_unregister_event_handler(&sa_dev->event_handler);
1045
0f47ae0b
MT		 1046 flush_scheduled_work();
1047
1da177e4
LT		 1048 for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
1049 ib_unregister_mad_agent(sa_dev->port[i].agent);
1050 kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
1051 }
1052
1053 kfree(sa_dev);
1054}
1055
1056static int __init ib_sa_init(void)
1057{
1058 int ret;
1059
1060 spin_lock_init(&idr_lock);
1061 spin_lock_init(&tid_lock);
1062
1063 get_random_bytes(&tid, sizeof tid);
1064
1065 ret = ib_register_client(&sa_client);
faec2f7b 1066 if (ret) {
1da177e4 1067 printk(KERN_ERR "Couldn't register ib_sa client\n");
faec2f7b
SH		 1068 goto err1;
1069 }
1070
1071 ret = mcast_init();
1072 if (ret) {
1073 printk(KERN_ERR "Couldn't initialize multicast handling\n");
1074 goto err2;
1075 }
1da177e4 1076
faec2f7b
SH		 1077 return 0;
1078err2:
1079 ib_unregister_client(&sa_client);
1080err1:
1da177e4
LT		 1081 return ret;
1082}
1083
1084static void __exit ib_sa_cleanup(void)
1085{
faec2f7b 1086 mcast_cleanup();
1da177e4 1087 ib_unregister_client(&sa_client);
5d7edb3c 1088 idr_destroy(&query_idr);
1da177e4
LT		 1089}
1090
1091module_init(ib_sa_init);
1092module_exit(ib_sa_cleanup);
kernel source for telekom puls (alcatel/mediatek)