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Merge branch 'writeback' of git://git.kernel.dk/linux-2.6-block
[linux-block.git] / drivers / infiniband / core / mad_rmpp.c
CommitLineData
fa619a77
HR		 1/*
2 * Copyright (c) 2005 Intel Inc. All rights reserved.
618a3c03 3 * Copyright (c) 2005-2006 Voltaire, Inc. All rights reserved.
fa619a77
HR		 4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
fa619a77
HR		 32 */
33
fa619a77
HR		 34#include "mad_priv.h"
35#include "mad_rmpp.h"
36
37enum rmpp_state {
38 RMPP_STATE_ACTIVE,
39 RMPP_STATE_TIMEOUT,
0e442afd
RD		 40 RMPP_STATE_COMPLETE,
41 RMPP_STATE_CANCELING
fa619a77
HR		 42};
43
44struct mad_rmpp_recv {
45 struct ib_mad_agent_private *agent;
46 struct list_head list;
c4028958
DH		 47 struct delayed_work timeout_work;
48 struct delayed_work cleanup_work;
1b52fa98 49 struct completion comp;
fa619a77
HR		 50 enum rmpp_state state;
51 spinlock_t lock;
52 atomic_t refcount;
53
54 struct ib_ah *ah;
55 struct ib_mad_recv_wc *rmpp_wc;
56 struct ib_mad_recv_buf *cur_seg_buf;
57 int last_ack;
58 int seg_num;
59 int newwin;
75ab1344 60 int repwin;
fa619a77 61
97f52eb4 62 __be64 tid;
fa619a77
HR		 63 u32 src_qp;
64 u16 slid;
65 u8 mgmt_class;
66 u8 class_version;
67 u8 method;
68};
69
1b52fa98
SH		 70static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
71{
72 if (atomic_dec_and_test(&rmpp_recv->refcount))
73 complete(&rmpp_recv->comp);
74}
75
fa619a77
HR		 76static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
77{
1b52fa98
SH		 78 deref_rmpp_recv(rmpp_recv);
79 wait_for_completion(&rmpp_recv->comp);
fa619a77
HR		 80 ib_destroy_ah(rmpp_recv->ah);
81 kfree(rmpp_recv);
82}
83
84void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent)
85{
86 struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv;
87 unsigned long flags;
88
89 spin_lock_irqsave(&agent->lock, flags);
0e442afd
RD		 90 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
91 if (rmpp_recv->state != RMPP_STATE_COMPLETE)
92 ib_free_recv_mad(rmpp_recv->rmpp_wc);
93 rmpp_recv->state = RMPP_STATE_CANCELING;
94 }
95 spin_unlock_irqrestore(&agent->lock, flags);
96
fa619a77
HR		 97 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
98 cancel_delayed_work(&rmpp_recv->timeout_work);
99 cancel_delayed_work(&rmpp_recv->cleanup_work);
100 }
fa619a77
HR		 101
102 flush_workqueue(agent->qp_info->port_priv->wq);
103
104 list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv,
105 &agent->rmpp_list, list) {
106 list_del(&rmpp_recv->list);
fa619a77
HR		 107 destroy_rmpp_recv(rmpp_recv);
108 }
109}
110
f36e1793 111static void format_ack(struct ib_mad_send_buf *msg,
fe9e08e1
SH		 112 struct ib_rmpp_mad *data,
113 struct mad_rmpp_recv *rmpp_recv)
114{
f36e1793 115 struct ib_rmpp_mad *ack = msg->mad;
fe9e08e1
SH		 116 unsigned long flags;
117
f36e1793 118 memcpy(ack, &data->mad_hdr, msg->hdr_len);
fe9e08e1
SH		 119
120 ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
121 ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK;
122 ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
123
124 spin_lock_irqsave(&rmpp_recv->lock, flags);
125 rmpp_recv->last_ack = rmpp_recv->seg_num;
126 ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num);
127 ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin);
128 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
129}
130
131static void ack_recv(struct mad_rmpp_recv *rmpp_recv,
132 struct ib_mad_recv_wc *recv_wc)
133{
134 struct ib_mad_send_buf *msg;
f36e1793 135 int ret, hdr_len;
fe9e08e1 136
618a3c03 137 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
fe9e08e1 138 msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp,
f36e1793
JM		 139 recv_wc->wc->pkey_index, 1, hdr_len,
140 0, GFP_KERNEL);
cd55ef5a 141 if (IS_ERR(msg))
fe9e08e1
SH		 142 return;
143
f36e1793 144 format_ack(msg, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv);
34816ad9
SH		 145 msg->ah = rmpp_recv->ah;
146 ret = ib_post_send_mad(msg, NULL);
fe9e08e1
SH		 147 if (ret)
148 ib_free_send_mad(msg);
149}
150
7cc656ef
RD		 151static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent,
152 struct ib_mad_recv_wc *recv_wc)
fe9e08e1 153{
7cc656ef 154 struct ib_mad_send_buf *msg;
fe9e08e1 155 struct ib_ah *ah;
f36e1793 156 int hdr_len;
fe9e08e1
SH		 157
158 ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc,
159 recv_wc->recv_buf.grh, agent->port_num);
160 if (IS_ERR(ah))
7cc656ef 161 return (void *) ah;
fe9e08e1 162
618a3c03 163 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
7cc656ef
RD		 164 msg = ib_create_send_mad(agent, recv_wc->wc->src_qp,
165 recv_wc->wc->pkey_index, 1,
f36e1793 166 hdr_len, 0, GFP_KERNEL);
7cc656ef 167 if (IS_ERR(msg))
fe9e08e1 168 ib_destroy_ah(ah);
38d5af95 169 else {
7cc656ef 170 msg->ah = ah;
38d5af95
SH		 171 msg->context[0] = ah;
172 }
7cc656ef
RD		 173
174 return msg;
fe9e08e1
SH		 175}
176
75ab1344
SH		 177static void ack_ds_ack(struct ib_mad_agent_private *agent,
178 struct ib_mad_recv_wc *recv_wc)
179{
180 struct ib_mad_send_buf *msg;
181 struct ib_rmpp_mad *rmpp_mad;
182 int ret;
183
184 msg = alloc_response_msg(&agent->agent, recv_wc);
185 if (IS_ERR(msg))
186 return;
187
188 rmpp_mad = msg->mad;
189 memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
190
191 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
192 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
193 rmpp_mad->rmpp_hdr.seg_num = 0;
194 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(1);
195
196 ret = ib_post_send_mad(msg, NULL);
197 if (ret) {
198 ib_destroy_ah(msg->ah);
199 ib_free_send_mad(msg);
200 }
201}
202
34816ad9 203void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc)
fe9e08e1 204{
38d5af95 205 if (mad_send_wc->send_buf->context[0] == mad_send_wc->send_buf->ah)
34816ad9
SH		 206 ib_destroy_ah(mad_send_wc->send_buf->ah);
207 ib_free_send_mad(mad_send_wc->send_buf);
fe9e08e1
SH		 208}
209
210static void nack_recv(struct ib_mad_agent_private *agent,
211 struct ib_mad_recv_wc *recv_wc, u8 rmpp_status)
212{
213 struct ib_mad_send_buf *msg;
214 struct ib_rmpp_mad *rmpp_mad;
fe9e08e1
SH		 215 int ret;
216
7cc656ef
RD		 217 msg = alloc_response_msg(&agent->agent, recv_wc);
218 if (IS_ERR(msg))
fe9e08e1
SH		 219 return;
220
34816ad9 221 rmpp_mad = msg->mad;
f36e1793 222 memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
fe9e08e1
SH		 223
224 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
225 rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION;
226 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ABORT;
227 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
228 rmpp_mad->rmpp_hdr.rmpp_status = rmpp_status;
229 rmpp_mad->rmpp_hdr.seg_num = 0;
230 rmpp_mad->rmpp_hdr.paylen_newwin = 0;
231
34816ad9
SH		 232 ret = ib_post_send_mad(msg, NULL);
233 if (ret) {
234 ib_destroy_ah(msg->ah);
235 ib_free_send_mad(msg);
236 }
fe9e08e1
SH		 237}
238
c4028958 239static void recv_timeout_handler(struct work_struct *work)
fa619a77 240{
c4028958
DH		 241 struct mad_rmpp_recv *rmpp_recv =
242 container_of(work, struct mad_rmpp_recv, timeout_work.work);
fa619a77
HR		 243 struct ib_mad_recv_wc *rmpp_wc;
244 unsigned long flags;
245
246 spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
247 if (rmpp_recv->state != RMPP_STATE_ACTIVE) {
248 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
249 return;
250 }
251 rmpp_recv->state = RMPP_STATE_TIMEOUT;
252 list_del(&rmpp_recv->list);
253 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
254
fa619a77 255 rmpp_wc = rmpp_recv->rmpp_wc;
fe9e08e1 256 nack_recv(rmpp_recv->agent, rmpp_wc, IB_MGMT_RMPP_STATUS_T2L);
fa619a77
HR		 257 destroy_rmpp_recv(rmpp_recv);
258 ib_free_recv_mad(rmpp_wc);
259}
260
c4028958 261static void recv_cleanup_handler(struct work_struct *work)
fa619a77 262{
c4028958
DH		 263 struct mad_rmpp_recv *rmpp_recv =
264 container_of(work, struct mad_rmpp_recv, cleanup_work.work);
fa619a77
HR		 265 unsigned long flags;
266
267 spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
0e442afd
RD		 268 if (rmpp_recv->state == RMPP_STATE_CANCELING) {
269 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
270 return;
271 }
fa619a77
HR		 272 list_del(&rmpp_recv->list);
273 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
274 destroy_rmpp_recv(rmpp_recv);
275}
276
277static struct mad_rmpp_recv *
278create_rmpp_recv(struct ib_mad_agent_private *agent,
279 struct ib_mad_recv_wc *mad_recv_wc)
280{
281 struct mad_rmpp_recv *rmpp_recv;
282 struct ib_mad_hdr *mad_hdr;
283
284 rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL);
285 if (!rmpp_recv)
286 return NULL;
287
288 rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd,
289 mad_recv_wc->wc,
290 mad_recv_wc->recv_buf.grh,
291 agent->agent.port_num);
292 if (IS_ERR(rmpp_recv->ah))
293 goto error;
294
295 rmpp_recv->agent = agent;
1b52fa98 296 init_completion(&rmpp_recv->comp);
c4028958
DH		 297 INIT_DELAYED_WORK(&rmpp_recv->timeout_work, recv_timeout_handler);
298 INIT_DELAYED_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler);
fa619a77
HR		 299 spin_lock_init(&rmpp_recv->lock);
300 rmpp_recv->state = RMPP_STATE_ACTIVE;
301 atomic_set(&rmpp_recv->refcount, 1);
302
303 rmpp_recv->rmpp_wc = mad_recv_wc;
304 rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf;
305 rmpp_recv->newwin = 1;
306 rmpp_recv->seg_num = 1;
307 rmpp_recv->last_ack = 0;
75ab1344 308 rmpp_recv->repwin = 1;
fa619a77
HR		 309
310 mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
311 rmpp_recv->tid = mad_hdr->tid;
312 rmpp_recv->src_qp = mad_recv_wc->wc->src_qp;
313 rmpp_recv->slid = mad_recv_wc->wc->slid;
314 rmpp_recv->mgmt_class = mad_hdr->mgmt_class;
315 rmpp_recv->class_version = mad_hdr->class_version;
316 rmpp_recv->method = mad_hdr->method;
317 return rmpp_recv;
318
319error: kfree(rmpp_recv);
320 return NULL;
321}
322
fa619a77
HR		 323static struct mad_rmpp_recv *
324find_rmpp_recv(struct ib_mad_agent_private *agent,
325 struct ib_mad_recv_wc *mad_recv_wc)
326{
327 struct mad_rmpp_recv *rmpp_recv;
328 struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
329
330 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
331 if (rmpp_recv->tid == mad_hdr->tid &&
332 rmpp_recv->src_qp == mad_recv_wc->wc->src_qp &&
333 rmpp_recv->slid == mad_recv_wc->wc->slid &&
334 rmpp_recv->mgmt_class == mad_hdr->mgmt_class &&
335 rmpp_recv->class_version == mad_hdr->class_version &&
336 rmpp_recv->method == mad_hdr->method)
337 return rmpp_recv;
338 }
339 return NULL;
340}
341
342static struct mad_rmpp_recv *
343acquire_rmpp_recv(struct ib_mad_agent_private *agent,
344 struct ib_mad_recv_wc *mad_recv_wc)
345{
346 struct mad_rmpp_recv *rmpp_recv;
347 unsigned long flags;
348
349 spin_lock_irqsave(&agent->lock, flags);
350 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
351 if (rmpp_recv)
352 atomic_inc(&rmpp_recv->refcount);
353 spin_unlock_irqrestore(&agent->lock, flags);
354 return rmpp_recv;
355}
356
357static struct mad_rmpp_recv *
358insert_rmpp_recv(struct ib_mad_agent_private *agent,
359 struct mad_rmpp_recv *rmpp_recv)
360{
361 struct mad_rmpp_recv *cur_rmpp_recv;
362
363 cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc);
364 if (!cur_rmpp_recv)
365 list_add_tail(&rmpp_recv->list, &agent->rmpp_list);
366
367 return cur_rmpp_recv;
368}
369
fa619a77
HR		 370static inline int get_last_flag(struct ib_mad_recv_buf *seg)
371{
372 struct ib_rmpp_mad *rmpp_mad;
373
374 rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
375 return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST;
376}
377
378static inline int get_seg_num(struct ib_mad_recv_buf *seg)
379{
380 struct ib_rmpp_mad *rmpp_mad;
381
382 rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
383 return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
384}
385
386static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list,
387 struct ib_mad_recv_buf *seg)
388{
389 if (seg->list.next == rmpp_list)
390 return NULL;
391
392 return container_of(seg->list.next, struct ib_mad_recv_buf, list);
393}
394
395static inline int window_size(struct ib_mad_agent_private *agent)
396{
397 return max(agent->qp_info->recv_queue.max_active >> 3, 1);
398}
399
400static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list,
401 int seg_num)
402{
3cd96564 403 struct ib_mad_recv_buf *seg_buf;
fa619a77
HR		 404 int cur_seg_num;
405
406 list_for_each_entry_reverse(seg_buf, rmpp_list, list) {
407 cur_seg_num = get_seg_num(seg_buf);
408 if (seg_num > cur_seg_num)
409 return seg_buf;
410 if (seg_num == cur_seg_num)
411 break;
412 }
413 return NULL;
414}
415
416static void update_seg_num(struct mad_rmpp_recv *rmpp_recv,
417 struct ib_mad_recv_buf *new_buf)
418{
419 struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list;
420
421 while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) {
422 rmpp_recv->cur_seg_buf = new_buf;
423 rmpp_recv->seg_num++;
424 new_buf = get_next_seg(rmpp_list, new_buf);
425 }
426}
427
428static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv)
429{
430 struct ib_rmpp_mad *rmpp_mad;
431 int hdr_size, data_size, pad;
432
433 rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad;
434
618a3c03 435 hdr_size = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
fa619a77 436 data_size = sizeof(struct ib_rmpp_mad) - hdr_size;
f2065e42
HR		 437 pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
438 if (pad > IB_MGMT_RMPP_DATA || pad < 0)
fa619a77
HR		 439 pad = 0;
440
441 return hdr_size + rmpp_recv->seg_num * data_size - pad;
442}
443
444static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv)
445{
446 struct ib_mad_recv_wc *rmpp_wc;
447
448 ack_recv(rmpp_recv, rmpp_recv->rmpp_wc);
449 if (rmpp_recv->seg_num > 1)
450 cancel_delayed_work(&rmpp_recv->timeout_work);
451
452 rmpp_wc = rmpp_recv->rmpp_wc;
453 rmpp_wc->mad_len = get_mad_len(rmpp_recv);
454 /* 10 seconds until we can find the packet lifetime */
455 queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq,
456 &rmpp_recv->cleanup_work, msecs_to_jiffies(10000));
457 return rmpp_wc;
458}
459
fa619a77
HR		 460static struct ib_mad_recv_wc *
461continue_rmpp(struct ib_mad_agent_private *agent,
462 struct ib_mad_recv_wc *mad_recv_wc)
463{
464 struct mad_rmpp_recv *rmpp_recv;
465 struct ib_mad_recv_buf *prev_buf;
466 struct ib_mad_recv_wc *done_wc;
467 int seg_num;
468 unsigned long flags;
469
470 rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc);
471 if (!rmpp_recv)
472 goto drop1;
473
474 seg_num = get_seg_num(&mad_recv_wc->recv_buf);
475
476 spin_lock_irqsave(&rmpp_recv->lock, flags);
477 if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) ||
478 (seg_num > rmpp_recv->newwin))
479 goto drop3;
480
481 if ((seg_num <= rmpp_recv->last_ack) ||
482 (rmpp_recv->state == RMPP_STATE_COMPLETE)) {
483 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
484 ack_recv(rmpp_recv, mad_recv_wc);
485 goto drop2;
486 }
487
488 prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num);
489 if (!prev_buf)
490 goto drop3;
491
492 done_wc = NULL;
493 list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list);
494 if (rmpp_recv->cur_seg_buf == prev_buf) {
495 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf);
496 if (get_last_flag(rmpp_recv->cur_seg_buf)) {
497 rmpp_recv->state = RMPP_STATE_COMPLETE;
498 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
499 done_wc = complete_rmpp(rmpp_recv);
500 goto out;
501 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) {
502 rmpp_recv->newwin += window_size(agent);
503 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
504 ack_recv(rmpp_recv, mad_recv_wc);
505 goto out;
506 }
507 }
508 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
509out:
510 deref_rmpp_recv(rmpp_recv);
511 return done_wc;
512
513drop3: spin_unlock_irqrestore(&rmpp_recv->lock, flags);
514drop2: deref_rmpp_recv(rmpp_recv);
515drop1: ib_free_recv_mad(mad_recv_wc);
516 return NULL;
517}
518
519static struct ib_mad_recv_wc *
520start_rmpp(struct ib_mad_agent_private *agent,
521 struct ib_mad_recv_wc *mad_recv_wc)
522{
523 struct mad_rmpp_recv *rmpp_recv;
524 unsigned long flags;
525
526 rmpp_recv = create_rmpp_recv(agent, mad_recv_wc);
527 if (!rmpp_recv) {
528 ib_free_recv_mad(mad_recv_wc);
529 return NULL;
530 }
531
532 spin_lock_irqsave(&agent->lock, flags);
533 if (insert_rmpp_recv(agent, rmpp_recv)) {
534 spin_unlock_irqrestore(&agent->lock, flags);
535 /* duplicate first MAD */
536 destroy_rmpp_recv(rmpp_recv);
537 return continue_rmpp(agent, mad_recv_wc);
538 }
539 atomic_inc(&rmpp_recv->refcount);
540
541 if (get_last_flag(&mad_recv_wc->recv_buf)) {
542 rmpp_recv->state = RMPP_STATE_COMPLETE;
543 spin_unlock_irqrestore(&agent->lock, flags);
544 complete_rmpp(rmpp_recv);
545 } else {
546 spin_unlock_irqrestore(&agent->lock, flags);
547 /* 40 seconds until we can find the packet lifetimes */
548 queue_delayed_work(agent->qp_info->port_priv->wq,
549 &rmpp_recv->timeout_work,
550 msecs_to_jiffies(40000));
551 rmpp_recv->newwin += window_size(agent);
552 ack_recv(rmpp_recv, mad_recv_wc);
553 mad_recv_wc = NULL;
554 }
555 deref_rmpp_recv(rmpp_recv);
556 return mad_recv_wc;
557}
558
fa619a77
HR		 559static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr)
560{
561 struct ib_rmpp_mad *rmpp_mad;
562 int timeout;
f36e1793 563 u32 paylen = 0;
fa619a77 564
34816ad9 565 rmpp_mad = mad_send_wr->send_buf.mad;
fa619a77 566 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
f36e1793 567 rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num);
fa619a77
HR		 568
569 if (mad_send_wr->seg_num == 1) {
570 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST;
f36e1793 571 paylen = mad_send_wr->send_buf.seg_count * IB_MGMT_RMPP_DATA -
972d512a 572 mad_send_wr->pad;
fa619a77
HR		 573 }
574
f36e1793 575 if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) {
fa619a77 576 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST;
972d512a 577 paylen = IB_MGMT_RMPP_DATA - mad_send_wr->pad;
fa619a77 578 }
f36e1793 579 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
fa619a77
HR		 580
581 /* 2 seconds for an ACK until we can find the packet lifetime */
34816ad9 582 timeout = mad_send_wr->send_buf.timeout_ms;
fa619a77
HR		 583 if (!timeout || timeout > 2000)
584 mad_send_wr->timeout = msecs_to_jiffies(2000);
f36e1793 585
fa619a77
HR		 586 return ib_send_mad(mad_send_wr);
587}
588
fa9656bb
JM		 589static void abort_send(struct ib_mad_agent_private *agent,
590 struct ib_mad_recv_wc *mad_recv_wc, u8 rmpp_status)
fe9e08e1
SH		 591{
592 struct ib_mad_send_wr_private *mad_send_wr;
593 struct ib_mad_send_wc wc;
594 unsigned long flags;
595
596 spin_lock_irqsave(&agent->lock, flags);
fa9656bb 597 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
fe9e08e1
SH		 598 if (!mad_send_wr)
599 goto out; /* Unmatched send */
600
f36e1793 601 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
fe9e08e1
SH		 602 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
603 goto out; /* Send is already done */
604
605 ib_mark_mad_done(mad_send_wr);
606 spin_unlock_irqrestore(&agent->lock, flags);
607
608 wc.status = IB_WC_REM_ABORT_ERR;
609 wc.vendor_err = rmpp_status;
34816ad9 610 wc.send_buf = &mad_send_wr->send_buf;
fe9e08e1
SH		 611 ib_mad_complete_send_wr(mad_send_wr, &wc);
612 return;
613out:
614 spin_unlock_irqrestore(&agent->lock, flags);
615}
616
f36e1793
JM		 617static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr,
618 int seg_num)
619{
620 struct list_head *list;
621
622 wr->last_ack = seg_num;
623 list = &wr->last_ack_seg->list;
624 list_for_each_entry(wr->last_ack_seg, list, list)
625 if (wr->last_ack_seg->num == seg_num)
626 break;
627}
628
75ab1344
SH		 629static void process_ds_ack(struct ib_mad_agent_private *agent,
630 struct ib_mad_recv_wc *mad_recv_wc, int newwin)
631{
632 struct mad_rmpp_recv *rmpp_recv;
633
634 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
635 if (rmpp_recv && rmpp_recv->state == RMPP_STATE_COMPLETE)
636 rmpp_recv->repwin = newwin;
637}
638
fa619a77
HR		 639static void process_rmpp_ack(struct ib_mad_agent_private *agent,
640 struct ib_mad_recv_wc *mad_recv_wc)
641{
642 struct ib_mad_send_wr_private *mad_send_wr;
643 struct ib_rmpp_mad *rmpp_mad;
644 unsigned long flags;
645 int seg_num, newwin, ret;
646
647 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
fe9e08e1 648 if (rmpp_mad->rmpp_hdr.rmpp_status) {
fa9656bb 649 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
fe9e08e1 650 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
fa619a77 651 return;
fe9e08e1 652 }
fa619a77
HR		 653
654 seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
655 newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
fe9e08e1 656 if (newwin < seg_num) {
fa9656bb 657 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
fe9e08e1
SH		 658 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
659 return;
660 }
fa619a77
HR		 661
662 spin_lock_irqsave(&agent->lock, flags);
fa9656bb 663 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
75ab1344
SH		 664 if (!mad_send_wr) {
665 if (!seg_num)
666 process_ds_ack(agent, mad_recv_wc, newwin);
667 goto out; /* Unmatched or DS RMPP ACK */
668 }
669
670 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) &&
671 (mad_send_wr->timeout)) {
672 spin_unlock_irqrestore(&agent->lock, flags);
673 ack_ds_ack(agent, mad_recv_wc);
674 return; /* Repeated ACK for DS RMPP transaction */
675 }
fa619a77 676
f36e1793 677 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
fa619a77
HR		 678 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
679 goto out; /* Send is already done */
680
f36e1793
JM		 681 if (seg_num > mad_send_wr->send_buf.seg_count ||
682 seg_num > mad_send_wr->newwin) {
fe9e08e1 683 spin_unlock_irqrestore(&agent->lock, flags);
fa9656bb 684 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
fe9e08e1
SH		 685 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
686 return;
687 }
fa619a77
HR		 688
689 if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack)
690 goto out; /* Old ACK */
691
692 if (seg_num > mad_send_wr->last_ack) {
f36e1793 693 adjust_last_ack(mad_send_wr, seg_num);
4fc8cd49 694 mad_send_wr->retries_left = mad_send_wr->max_retries;
fa619a77
HR		 695 }
696 mad_send_wr->newwin = newwin;
f36e1793 697 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
fa619a77 698 /* If no response is expected, the ACK completes the send */
34816ad9 699 if (!mad_send_wr->send_buf.timeout_ms) {
fa619a77
HR		 700 struct ib_mad_send_wc wc;
701
702 ib_mark_mad_done(mad_send_wr);
703 spin_unlock_irqrestore(&agent->lock, flags);
704
705 wc.status = IB_WC_SUCCESS;
706 wc.vendor_err = 0;
34816ad9 707 wc.send_buf = &mad_send_wr->send_buf;
fa619a77
HR		 708 ib_mad_complete_send_wr(mad_send_wr, &wc);
709 return;
710 }
711 if (mad_send_wr->refcount == 1)
34816ad9
SH		 712 ib_reset_mad_timeout(mad_send_wr,
713 mad_send_wr->send_buf.timeout_ms);
75ab1344
SH		 714 spin_unlock_irqrestore(&agent->lock, flags);
715 ack_ds_ack(agent, mad_recv_wc);
716 return;
fa619a77
HR		 717 } else if (mad_send_wr->refcount == 1 &&
718 mad_send_wr->seg_num < mad_send_wr->newwin &&
f36e1793 719 mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) {
fa619a77
HR		 720 /* Send failure will just result in a timeout/retry */
721 ret = send_next_seg(mad_send_wr);
722 if (ret)
723 goto out;
724
725 mad_send_wr->refcount++;
179e0917 726 list_move_tail(&mad_send_wr->agent_list,
fa619a77
HR		 727 &mad_send_wr->mad_agent_priv->send_list);
728 }
729out:
730 spin_unlock_irqrestore(&agent->lock, flags);
731}
732
fe9e08e1
SH		 733static struct ib_mad_recv_wc *
734process_rmpp_data(struct ib_mad_agent_private *agent,
735 struct ib_mad_recv_wc *mad_recv_wc)
736{
737 struct ib_rmpp_hdr *rmpp_hdr;
738 u8 rmpp_status;
739
740 rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr;
741
742 if (rmpp_hdr->rmpp_status) {
743 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS;
744 goto bad;
745 }
746
9c3da099 747 if (rmpp_hdr->seg_num == cpu_to_be32(1)) {
fe9e08e1
SH		 748 if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) {
749 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
750 goto bad;
751 }
752 return start_rmpp(agent, mad_recv_wc);
753 } else {
754 if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) {
755 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
756 goto bad;
757 }
758 return continue_rmpp(agent, mad_recv_wc);
759 }
760bad:
761 nack_recv(agent, mad_recv_wc, rmpp_status);
762 ib_free_recv_mad(mad_recv_wc);
763 return NULL;
764}
765
766static void process_rmpp_stop(struct ib_mad_agent_private *agent,
767 struct ib_mad_recv_wc *mad_recv_wc)
768{
769 struct ib_rmpp_mad *rmpp_mad;
770
771 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
772
773 if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) {
fa9656bb 774 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
fe9e08e1
SH		 775 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
776 } else
fa9656bb 777 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
fe9e08e1
SH		 778}
779
780static void process_rmpp_abort(struct ib_mad_agent_private *agent,
781 struct ib_mad_recv_wc *mad_recv_wc)
782{
783 struct ib_rmpp_mad *rmpp_mad;
784
785 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
786
787 if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN ||
788 rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) {
fa9656bb 789 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
fe9e08e1
SH		 790 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
791 } else
fa9656bb 792 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
fe9e08e1
SH		 793}
794
fa619a77
HR		 795struct ib_mad_recv_wc *
796ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent,
797 struct ib_mad_recv_wc *mad_recv_wc)
798{
799 struct ib_rmpp_mad *rmpp_mad;
800
801 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
802 if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE))
803 return mad_recv_wc;
804
fe9e08e1 805 if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) {
fa9656bb 806 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
fe9e08e1 807 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
fa619a77 808 goto out;
fe9e08e1 809 }
fa619a77
HR		 810
811 switch (rmpp_mad->rmpp_hdr.rmpp_type) {
812 case IB_MGMT_RMPP_TYPE_DATA:
fe9e08e1 813 return process_rmpp_data(agent, mad_recv_wc);
fa619a77
HR		 814 case IB_MGMT_RMPP_TYPE_ACK:
815 process_rmpp_ack(agent, mad_recv_wc);
816 break;
817 case IB_MGMT_RMPP_TYPE_STOP:
fe9e08e1
SH		 818 process_rmpp_stop(agent, mad_recv_wc);
819 break;
fa619a77 820 case IB_MGMT_RMPP_TYPE_ABORT:
fe9e08e1 821 process_rmpp_abort(agent, mad_recv_wc);
fa619a77
HR		 822 break;
823 default:
fa9656bb 824 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
fe9e08e1 825 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
fa619a77
HR		 826 break;
827 }
828out:
829 ib_free_recv_mad(mad_recv_wc);
830 return NULL;
831}
832
75ab1344
SH		 833static int init_newwin(struct ib_mad_send_wr_private *mad_send_wr)
834{
835 struct ib_mad_agent_private *agent = mad_send_wr->mad_agent_priv;
836 struct ib_mad_hdr *mad_hdr = mad_send_wr->send_buf.mad;
837 struct mad_rmpp_recv *rmpp_recv;
838 struct ib_ah_attr ah_attr;
839 unsigned long flags;
840 int newwin = 1;
841
842 if (!(mad_hdr->method & IB_MGMT_METHOD_RESP))
843 goto out;
844
845 spin_lock_irqsave(&agent->lock, flags);
846 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
847 if (rmpp_recv->tid != mad_hdr->tid ||
848 rmpp_recv->mgmt_class != mad_hdr->mgmt_class ||
849 rmpp_recv->class_version != mad_hdr->class_version ||
850 (rmpp_recv->method & IB_MGMT_METHOD_RESP))
851 continue;
852
853 if (ib_query_ah(mad_send_wr->send_buf.ah, &ah_attr))
854 continue;
855
856 if (rmpp_recv->slid == ah_attr.dlid) {
857 newwin = rmpp_recv->repwin;
858 break;
859 }
860 }
861 spin_unlock_irqrestore(&agent->lock, flags);
862out:
863 return newwin;
864}
865
fa619a77
HR		 866int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
867{
868 struct ib_rmpp_mad *rmpp_mad;
f36e1793 869 int ret;
fa619a77 870
34816ad9 871 rmpp_mad = mad_send_wr->send_buf.mad;
fa619a77
HR		 872 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
873 IB_MGMT_RMPP_FLAG_ACTIVE))
874 return IB_RMPP_RESULT_UNHANDLED;
875
f36e1793
JM		 876 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) {
877 mad_send_wr->seg_num = 1;
fa619a77 878 return IB_RMPP_RESULT_INTERNAL;
f36e1793 879 }
fa619a77 880
75ab1344 881 mad_send_wr->newwin = init_newwin(mad_send_wr);
fa619a77
HR		 882
883 /* We need to wait for the final ACK even if there isn't a response */
884 mad_send_wr->refcount += (mad_send_wr->timeout == 0);
885 ret = send_next_seg(mad_send_wr);
886 if (!ret)
887 return IB_RMPP_RESULT_CONSUMED;
888 return ret;
889}
890
891int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr,
892 struct ib_mad_send_wc *mad_send_wc)
893{
894 struct ib_rmpp_mad *rmpp_mad;
fa619a77
HR		 895 int ret;
896
34816ad9 897 rmpp_mad = mad_send_wr->send_buf.mad;
fa619a77
HR		 898 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
899 IB_MGMT_RMPP_FLAG_ACTIVE))
900 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
901
34816ad9 902 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
fa619a77 903 return IB_RMPP_RESULT_INTERNAL; /* ACK, STOP, or ABORT */
fa619a77
HR		 904
905 if (mad_send_wc->status != IB_WC_SUCCESS ||
906 mad_send_wr->status != IB_WC_SUCCESS)
907 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */
908
909 if (!mad_send_wr->timeout)
910 return IB_RMPP_RESULT_PROCESSED; /* Response received */
911
f36e1793 912 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
fa619a77 913 mad_send_wr->timeout =
34816ad9 914 msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
fa619a77
HR		 915 return IB_RMPP_RESULT_PROCESSED; /* Send done */
916 }
917
f36e1793
JM		 918 if (mad_send_wr->seg_num == mad_send_wr->newwin ||
919 mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count)
fa619a77
HR		 920 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */
921
922 ret = send_next_seg(mad_send_wr);
923 if (ret) {
924 mad_send_wc->status = IB_WC_GENERAL_ERR;
925 return IB_RMPP_RESULT_PROCESSED;
926 }
927 return IB_RMPP_RESULT_CONSUMED;
928}
929
930int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr)
931{
932 struct ib_rmpp_mad *rmpp_mad;
933 int ret;
934
34816ad9 935 rmpp_mad = mad_send_wr->send_buf.mad;
fa619a77
HR		 936 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
937 IB_MGMT_RMPP_FLAG_ACTIVE))
938 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
939
f36e1793 940 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count)
fa619a77
HR		 941 return IB_RMPP_RESULT_PROCESSED;
942
f36e1793
JM		 943 mad_send_wr->seg_num = mad_send_wr->last_ack;
944 mad_send_wr->cur_seg = mad_send_wr->last_ack_seg;
945
fa619a77
HR		 946 ret = send_next_seg(mad_send_wr);
947 if (ret)
948 return IB_RMPP_RESULT_PROCESSED;
949
950 return IB_RMPP_RESULT_CONSUMED;
951}
Linux 6.x block layer and io_uring tree(s)