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1/*
2 * Copyright (c) 2005 Intel Inc. All rights reserved.
3 * Copyright (c) 2005-2006 Voltaire, Inc. All rights reserved.
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.
32 */
33
34#include <linux/slab.h>
35
36#include "mad_priv.h"
37#include "mad_rmpp.h"
38
39enum rmpp_state {
40 RMPP_STATE_ACTIVE,
41 RMPP_STATE_TIMEOUT,
42 RMPP_STATE_COMPLETE,
43 RMPP_STATE_CANCELING
44};
45
46struct mad_rmpp_recv {
47 struct ib_mad_agent_private *agent;
48 struct list_head list;
49 struct delayed_work timeout_work;
50 struct delayed_work cleanup_work;
51 struct completion comp;
52 enum rmpp_state state;
53 spinlock_t lock;
54 atomic_t refcount;
55
56 struct ib_ah *ah;
57 struct ib_mad_recv_wc *rmpp_wc;
58 struct ib_mad_recv_buf *cur_seg_buf;
59 int last_ack;
60 int seg_num;
61 int newwin;
62 int repwin;
63
64 __be64 tid;
65 u32 src_qp;
66 u16 slid;
67 u8 mgmt_class;
68 u8 class_version;
69 u8 method;
70};
71
72static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
73{
74 if (atomic_dec_and_test(&rmpp_recv->refcount))
75 complete(&rmpp_recv->comp);
76}
77
78static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
79{
80 deref_rmpp_recv(rmpp_recv);
81 wait_for_completion(&rmpp_recv->comp);
82 ib_destroy_ah(rmpp_recv->ah);
83 kfree(rmpp_recv);
84}
85
86void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent)
87{
88 struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv;
89 unsigned long flags;
90
91 spin_lock_irqsave(&agent->lock, flags);
92 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
93 if (rmpp_recv->state != RMPP_STATE_COMPLETE)
94 ib_free_recv_mad(rmpp_recv->rmpp_wc);
95 rmpp_recv->state = RMPP_STATE_CANCELING;
96 }
97 spin_unlock_irqrestore(&agent->lock, flags);
98
99 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
100 cancel_delayed_work(&rmpp_recv->timeout_work);
101 cancel_delayed_work(&rmpp_recv->cleanup_work);
102 }
103
104 flush_workqueue(agent->qp_info->port_priv->wq);
105
106 list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv,
107 &agent->rmpp_list, list) {
108 list_del(&rmpp_recv->list);
109 destroy_rmpp_recv(rmpp_recv);
110 }
111}
112
113static void format_ack(struct ib_mad_send_buf *msg,
114 struct ib_rmpp_mad *data,
115 struct mad_rmpp_recv *rmpp_recv)
116{
117 struct ib_rmpp_mad *ack = msg->mad;
118 unsigned long flags;
119
120 memcpy(ack, &data->mad_hdr, msg->hdr_len);
121
122 ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
123 ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK;
124 ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
125
126 spin_lock_irqsave(&rmpp_recv->lock, flags);
127 rmpp_recv->last_ack = rmpp_recv->seg_num;
128 ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num);
129 ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin);
130 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
131}
132
133static void ack_recv(struct mad_rmpp_recv *rmpp_recv,
134 struct ib_mad_recv_wc *recv_wc)
135{
136 struct ib_mad_send_buf *msg;
137 int ret, hdr_len;
138
139 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
140 msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp,
141 recv_wc->wc->pkey_index, 1, hdr_len,
142 0, GFP_KERNEL);
143 if (IS_ERR(msg))
144 return;
145
146 format_ack(msg, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv);
147 msg->ah = rmpp_recv->ah;
148 ret = ib_post_send_mad(msg, NULL);
149 if (ret)
150 ib_free_send_mad(msg);
151}
152
153static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent,
154 struct ib_mad_recv_wc *recv_wc)
155{
156 struct ib_mad_send_buf *msg;
157 struct ib_ah *ah;
158 int hdr_len;
159
160 ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc,
161 recv_wc->recv_buf.grh, agent->port_num);
162 if (IS_ERR(ah))
163 return (void *) ah;
164
165 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
166 msg = ib_create_send_mad(agent, recv_wc->wc->src_qp,
167 recv_wc->wc->pkey_index, 1,
168 hdr_len, 0, GFP_KERNEL);
169 if (IS_ERR(msg))
170 ib_destroy_ah(ah);
171 else {
172 msg->ah = ah;
173 msg->context[0] = ah;
174 }
175
176 return msg;
177}
178
179static void ack_ds_ack(struct ib_mad_agent_private *agent,
180 struct ib_mad_recv_wc *recv_wc)
181{
182 struct ib_mad_send_buf *msg;
183 struct ib_rmpp_mad *rmpp_mad;
184 int ret;
185
186 msg = alloc_response_msg(&agent->agent, recv_wc);
187 if (IS_ERR(msg))
188 return;
189
190 rmpp_mad = msg->mad;
191 memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
192
193 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
194 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
195 rmpp_mad->rmpp_hdr.seg_num = 0;
196 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(1);
197
198 ret = ib_post_send_mad(msg, NULL);
199 if (ret) {
200 ib_destroy_ah(msg->ah);
201 ib_free_send_mad(msg);
202 }
203}
204
205void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc)
206{
207 if (mad_send_wc->send_buf->context[0] == mad_send_wc->send_buf->ah)
208 ib_destroy_ah(mad_send_wc->send_buf->ah);
209 ib_free_send_mad(mad_send_wc->send_buf);
210}
211
212static void nack_recv(struct ib_mad_agent_private *agent,
213 struct ib_mad_recv_wc *recv_wc, u8 rmpp_status)
214{
215 struct ib_mad_send_buf *msg;
216 struct ib_rmpp_mad *rmpp_mad;
217 int ret;
218
219 msg = alloc_response_msg(&agent->agent, recv_wc);
220 if (IS_ERR(msg))
221 return;
222
223 rmpp_mad = msg->mad;
224 memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
225
226 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
227 rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION;
228 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ABORT;
229 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
230 rmpp_mad->rmpp_hdr.rmpp_status = rmpp_status;
231 rmpp_mad->rmpp_hdr.seg_num = 0;
232 rmpp_mad->rmpp_hdr.paylen_newwin = 0;
233
234 ret = ib_post_send_mad(msg, NULL);
235 if (ret) {
236 ib_destroy_ah(msg->ah);
237 ib_free_send_mad(msg);
238 }
239}
240
241static void recv_timeout_handler(struct work_struct *work)
242{
243 struct mad_rmpp_recv *rmpp_recv =
244 container_of(work, struct mad_rmpp_recv, timeout_work.work);
245 struct ib_mad_recv_wc *rmpp_wc;
246 unsigned long flags;
247
248 spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
249 if (rmpp_recv->state != RMPP_STATE_ACTIVE) {
250 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
251 return;
252 }
253 rmpp_recv->state = RMPP_STATE_TIMEOUT;
254 list_del(&rmpp_recv->list);
255 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
256
257 rmpp_wc = rmpp_recv->rmpp_wc;
258 nack_recv(rmpp_recv->agent, rmpp_wc, IB_MGMT_RMPP_STATUS_T2L);
259 destroy_rmpp_recv(rmpp_recv);
260 ib_free_recv_mad(rmpp_wc);
261}
262
263static void recv_cleanup_handler(struct work_struct *work)
264{
265 struct mad_rmpp_recv *rmpp_recv =
266 container_of(work, struct mad_rmpp_recv, cleanup_work.work);
267 unsigned long flags;
268
269 spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
270 if (rmpp_recv->state == RMPP_STATE_CANCELING) {
271 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
272 return;
273 }
274 list_del(&rmpp_recv->list);
275 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
276 destroy_rmpp_recv(rmpp_recv);
277}
278
279static struct mad_rmpp_recv *
280create_rmpp_recv(struct ib_mad_agent_private *agent,
281 struct ib_mad_recv_wc *mad_recv_wc)
282{
283 struct mad_rmpp_recv *rmpp_recv;
284 struct ib_mad_hdr *mad_hdr;
285
286 rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL);
287 if (!rmpp_recv)
288 return NULL;
289
290 rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd,
291 mad_recv_wc->wc,
292 mad_recv_wc->recv_buf.grh,
293 agent->agent.port_num);
294 if (IS_ERR(rmpp_recv->ah))
295 goto error;
296
297 rmpp_recv->agent = agent;
298 init_completion(&rmpp_recv->comp);
299 INIT_DELAYED_WORK(&rmpp_recv->timeout_work, recv_timeout_handler);
300 INIT_DELAYED_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler);
301 spin_lock_init(&rmpp_recv->lock);
302 rmpp_recv->state = RMPP_STATE_ACTIVE;
303 atomic_set(&rmpp_recv->refcount, 1);
304
305 rmpp_recv->rmpp_wc = mad_recv_wc;
306 rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf;
307 rmpp_recv->newwin = 1;
308 rmpp_recv->seg_num = 1;
309 rmpp_recv->last_ack = 0;
310 rmpp_recv->repwin = 1;
311
312 mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
313 rmpp_recv->tid = mad_hdr->tid;
314 rmpp_recv->src_qp = mad_recv_wc->wc->src_qp;
315 rmpp_recv->slid = mad_recv_wc->wc->slid;
316 rmpp_recv->mgmt_class = mad_hdr->mgmt_class;
317 rmpp_recv->class_version = mad_hdr->class_version;
318 rmpp_recv->method = mad_hdr->method;
319 return rmpp_recv;
320
321error: kfree(rmpp_recv);
322 return NULL;
323}
324
325static struct mad_rmpp_recv *
326find_rmpp_recv(struct ib_mad_agent_private *agent,
327 struct ib_mad_recv_wc *mad_recv_wc)
328{
329 struct mad_rmpp_recv *rmpp_recv;
330 struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
331
332 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
333 if (rmpp_recv->tid == mad_hdr->tid &&
334 rmpp_recv->src_qp == mad_recv_wc->wc->src_qp &&
335 rmpp_recv->slid == mad_recv_wc->wc->slid &&
336 rmpp_recv->mgmt_class == mad_hdr->mgmt_class &&
337 rmpp_recv->class_version == mad_hdr->class_version &&
338 rmpp_recv->method == mad_hdr->method)
339 return rmpp_recv;
340 }
341 return NULL;
342}
343
344static struct mad_rmpp_recv *
345acquire_rmpp_recv(struct ib_mad_agent_private *agent,
346 struct ib_mad_recv_wc *mad_recv_wc)
347{
348 struct mad_rmpp_recv *rmpp_recv;
349 unsigned long flags;
350
351 spin_lock_irqsave(&agent->lock, flags);
352 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
353 if (rmpp_recv)
354 atomic_inc(&rmpp_recv->refcount);
355 spin_unlock_irqrestore(&agent->lock, flags);
356 return rmpp_recv;
357}
358
359static struct mad_rmpp_recv *
360insert_rmpp_recv(struct ib_mad_agent_private *agent,
361 struct mad_rmpp_recv *rmpp_recv)
362{
363 struct mad_rmpp_recv *cur_rmpp_recv;
364
365 cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc);
366 if (!cur_rmpp_recv)
367 list_add_tail(&rmpp_recv->list, &agent->rmpp_list);
368
369 return cur_rmpp_recv;
370}
371
372static inline int get_last_flag(struct ib_mad_recv_buf *seg)
373{
374 struct ib_rmpp_mad *rmpp_mad;
375
376 rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
377 return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST;
378}
379
380static inline int get_seg_num(struct ib_mad_recv_buf *seg)
381{
382 struct ib_rmpp_mad *rmpp_mad;
383
384 rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
385 return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
386}
387
388static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list,
389 struct ib_mad_recv_buf *seg)
390{
391 if (seg->list.next == rmpp_list)
392 return NULL;
393
394 return container_of(seg->list.next, struct ib_mad_recv_buf, list);
395}
396
397static inline int window_size(struct ib_mad_agent_private *agent)
398{
399 return max(agent->qp_info->recv_queue.max_active >> 3, 1);
400}
401
402static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list,
403 int seg_num)
404{
405 struct ib_mad_recv_buf *seg_buf;
406 int cur_seg_num;
407
408 list_for_each_entry_reverse(seg_buf, rmpp_list, list) {
409 cur_seg_num = get_seg_num(seg_buf);
410 if (seg_num > cur_seg_num)
411 return seg_buf;
412 if (seg_num == cur_seg_num)
413 break;
414 }
415 return NULL;
416}
417
418static void update_seg_num(struct mad_rmpp_recv *rmpp_recv,
419 struct ib_mad_recv_buf *new_buf)
420{
421 struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list;
422
423 while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) {
424 rmpp_recv->cur_seg_buf = new_buf;
425 rmpp_recv->seg_num++;
426 new_buf = get_next_seg(rmpp_list, new_buf);
427 }
428}
429
430static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv)
431{
432 struct ib_rmpp_mad *rmpp_mad;
433 int hdr_size, data_size, pad;
434
435 rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad;
436
437 hdr_size = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
438 data_size = sizeof(struct ib_rmpp_mad) - hdr_size;
439 pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
440 if (pad > IB_MGMT_RMPP_DATA || pad < 0)
441 pad = 0;
442
443 return hdr_size + rmpp_recv->seg_num * data_size - pad;
444}
445
446static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv)
447{
448 struct ib_mad_recv_wc *rmpp_wc;
449
450 ack_recv(rmpp_recv, rmpp_recv->rmpp_wc);
451 if (rmpp_recv->seg_num > 1)
452 cancel_delayed_work(&rmpp_recv->timeout_work);
453
454 rmpp_wc = rmpp_recv->rmpp_wc;
455 rmpp_wc->mad_len = get_mad_len(rmpp_recv);
456 /* 10 seconds until we can find the packet lifetime */
457 queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq,
458 &rmpp_recv->cleanup_work, msecs_to_jiffies(10000));
459 return rmpp_wc;
460}
461
462static struct ib_mad_recv_wc *
463continue_rmpp(struct ib_mad_agent_private *agent,
464 struct ib_mad_recv_wc *mad_recv_wc)
465{
466 struct mad_rmpp_recv *rmpp_recv;
467 struct ib_mad_recv_buf *prev_buf;
468 struct ib_mad_recv_wc *done_wc;
469 int seg_num;
470 unsigned long flags;
471
472 rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc);
473 if (!rmpp_recv)
474 goto drop1;
475
476 seg_num = get_seg_num(&mad_recv_wc->recv_buf);
477
478 spin_lock_irqsave(&rmpp_recv->lock, flags);
479 if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) ||
480 (seg_num > rmpp_recv->newwin))
481 goto drop3;
482
483 if ((seg_num <= rmpp_recv->last_ack) ||
484 (rmpp_recv->state == RMPP_STATE_COMPLETE)) {
485 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
486 ack_recv(rmpp_recv, mad_recv_wc);
487 goto drop2;
488 }
489
490 prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num);
491 if (!prev_buf)
492 goto drop3;
493
494 done_wc = NULL;
495 list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list);
496 if (rmpp_recv->cur_seg_buf == prev_buf) {
497 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf);
498 if (get_last_flag(rmpp_recv->cur_seg_buf)) {
499 rmpp_recv->state = RMPP_STATE_COMPLETE;
500 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
501 done_wc = complete_rmpp(rmpp_recv);
502 goto out;
503 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) {
504 rmpp_recv->newwin += window_size(agent);
505 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
506 ack_recv(rmpp_recv, mad_recv_wc);
507 goto out;
508 }
509 }
510 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
511out:
512 deref_rmpp_recv(rmpp_recv);
513 return done_wc;
514
515drop3: spin_unlock_irqrestore(&rmpp_recv->lock, flags);
516drop2: deref_rmpp_recv(rmpp_recv);
517drop1: ib_free_recv_mad(mad_recv_wc);
518 return NULL;
519}
520
521static struct ib_mad_recv_wc *
522start_rmpp(struct ib_mad_agent_private *agent,
523 struct ib_mad_recv_wc *mad_recv_wc)
524{
525 struct mad_rmpp_recv *rmpp_recv;
526 unsigned long flags;
527
528 rmpp_recv = create_rmpp_recv(agent, mad_recv_wc);
529 if (!rmpp_recv) {
530 ib_free_recv_mad(mad_recv_wc);
531 return NULL;
532 }
533
534 spin_lock_irqsave(&agent->lock, flags);
535 if (insert_rmpp_recv(agent, rmpp_recv)) {
536 spin_unlock_irqrestore(&agent->lock, flags);
537 /* duplicate first MAD */
538 destroy_rmpp_recv(rmpp_recv);
539 return continue_rmpp(agent, mad_recv_wc);
540 }
541 atomic_inc(&rmpp_recv->refcount);
542
543 if (get_last_flag(&mad_recv_wc->recv_buf)) {
544 rmpp_recv->state = RMPP_STATE_COMPLETE;
545 spin_unlock_irqrestore(&agent->lock, flags);
546 complete_rmpp(rmpp_recv);
547 } else {
548 spin_unlock_irqrestore(&agent->lock, flags);
549 /* 40 seconds until we can find the packet lifetimes */
550 queue_delayed_work(agent->qp_info->port_priv->wq,
551 &rmpp_recv->timeout_work,
552 msecs_to_jiffies(40000));
553 rmpp_recv->newwin += window_size(agent);
554 ack_recv(rmpp_recv, mad_recv_wc);
555 mad_recv_wc = NULL;
556 }
557 deref_rmpp_recv(rmpp_recv);
558 return mad_recv_wc;
559}
560
561static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr)
562{
563 struct ib_rmpp_mad *rmpp_mad;
564 int timeout;
565 u32 paylen = 0;
566
567 rmpp_mad = mad_send_wr->send_buf.mad;
568 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
569 rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num);
570
571 if (mad_send_wr->seg_num == 1) {
572 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST;
573 paylen = mad_send_wr->send_buf.seg_count * IB_MGMT_RMPP_DATA -
574 mad_send_wr->pad;
575 }
576
577 if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) {
578 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST;
579 paylen = IB_MGMT_RMPP_DATA - mad_send_wr->pad;
580 }
581 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
582
583 /* 2 seconds for an ACK until we can find the packet lifetime */
584 timeout = mad_send_wr->send_buf.timeout_ms;
585 if (!timeout || timeout > 2000)
586 mad_send_wr->timeout = msecs_to_jiffies(2000);
587
588 return ib_send_mad(mad_send_wr);
589}
590
591static void abort_send(struct ib_mad_agent_private *agent,
592 struct ib_mad_recv_wc *mad_recv_wc, u8 rmpp_status)
593{
594 struct ib_mad_send_wr_private *mad_send_wr;
595 struct ib_mad_send_wc wc;
596 unsigned long flags;
597
598 spin_lock_irqsave(&agent->lock, flags);
599 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
600 if (!mad_send_wr)
601 goto out; /* Unmatched send */
602
603 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
604 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
605 goto out; /* Send is already done */
606
607 ib_mark_mad_done(mad_send_wr);
608 spin_unlock_irqrestore(&agent->lock, flags);
609
610 wc.status = IB_WC_REM_ABORT_ERR;
611 wc.vendor_err = rmpp_status;
612 wc.send_buf = &mad_send_wr->send_buf;
613 ib_mad_complete_send_wr(mad_send_wr, &wc);
614 return;
615out:
616 spin_unlock_irqrestore(&agent->lock, flags);
617}
618
619static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr,
620 int seg_num)
621{
622 struct list_head *list;
623
624 wr->last_ack = seg_num;
625 list = &wr->last_ack_seg->list;
626 list_for_each_entry(wr->last_ack_seg, list, list)
627 if (wr->last_ack_seg->num == seg_num)
628 break;
629}
630
631static void process_ds_ack(struct ib_mad_agent_private *agent,
632 struct ib_mad_recv_wc *mad_recv_wc, int newwin)
633{
634 struct mad_rmpp_recv *rmpp_recv;
635
636 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
637 if (rmpp_recv && rmpp_recv->state == RMPP_STATE_COMPLETE)
638 rmpp_recv->repwin = newwin;
639}
640
641static void process_rmpp_ack(struct ib_mad_agent_private *agent,
642 struct ib_mad_recv_wc *mad_recv_wc)
643{
644 struct ib_mad_send_wr_private *mad_send_wr;
645 struct ib_rmpp_mad *rmpp_mad;
646 unsigned long flags;
647 int seg_num, newwin, ret;
648
649 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
650 if (rmpp_mad->rmpp_hdr.rmpp_status) {
651 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
652 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
653 return;
654 }
655
656 seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
657 newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
658 if (newwin < seg_num) {
659 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
660 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
661 return;
662 }
663
664 spin_lock_irqsave(&agent->lock, flags);
665 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
666 if (!mad_send_wr) {
667 if (!seg_num)
668 process_ds_ack(agent, mad_recv_wc, newwin);
669 goto out; /* Unmatched or DS RMPP ACK */
670 }
671
672 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) &&
673 (mad_send_wr->timeout)) {
674 spin_unlock_irqrestore(&agent->lock, flags);
675 ack_ds_ack(agent, mad_recv_wc);
676 return; /* Repeated ACK for DS RMPP transaction */
677 }
678
679 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
680 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
681 goto out; /* Send is already done */
682
683 if (seg_num > mad_send_wr->send_buf.seg_count ||
684 seg_num > mad_send_wr->newwin) {
685 spin_unlock_irqrestore(&agent->lock, flags);
686 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
687 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
688 return;
689 }
690
691 if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack)
692 goto out; /* Old ACK */
693
694 if (seg_num > mad_send_wr->last_ack) {
695 adjust_last_ack(mad_send_wr, seg_num);
696 mad_send_wr->retries_left = mad_send_wr->max_retries;
697 }
698 mad_send_wr->newwin = newwin;
699 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
700 /* If no response is expected, the ACK completes the send */
701 if (!mad_send_wr->send_buf.timeout_ms) {
702 struct ib_mad_send_wc wc;
703
704 ib_mark_mad_done(mad_send_wr);
705 spin_unlock_irqrestore(&agent->lock, flags);
706
707 wc.status = IB_WC_SUCCESS;
708 wc.vendor_err = 0;
709 wc.send_buf = &mad_send_wr->send_buf;
710 ib_mad_complete_send_wr(mad_send_wr, &wc);
711 return;
712 }
713 if (mad_send_wr->refcount == 1)
714 ib_reset_mad_timeout(mad_send_wr,
715 mad_send_wr->send_buf.timeout_ms);
716 spin_unlock_irqrestore(&agent->lock, flags);
717 ack_ds_ack(agent, mad_recv_wc);
718 return;
719 } else if (mad_send_wr->refcount == 1 &&
720 mad_send_wr->seg_num < mad_send_wr->newwin &&
721 mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) {
722 /* Send failure will just result in a timeout/retry */
723 ret = send_next_seg(mad_send_wr);
724 if (ret)
725 goto out;
726
727 mad_send_wr->refcount++;
728 list_move_tail(&mad_send_wr->agent_list,
729 &mad_send_wr->mad_agent_priv->send_list);
730 }
731out:
732 spin_unlock_irqrestore(&agent->lock, flags);
733}
734
735static struct ib_mad_recv_wc *
736process_rmpp_data(struct ib_mad_agent_private *agent,
737 struct ib_mad_recv_wc *mad_recv_wc)
738{
739 struct ib_rmpp_hdr *rmpp_hdr;
740 u8 rmpp_status;
741
742 rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr;
743
744 if (rmpp_hdr->rmpp_status) {
745 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS;
746 goto bad;
747 }
748
749 if (rmpp_hdr->seg_num == cpu_to_be32(1)) {
750 if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) {
751 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
752 goto bad;
753 }
754 return start_rmpp(agent, mad_recv_wc);
755 } else {
756 if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) {
757 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
758 goto bad;
759 }
760 return continue_rmpp(agent, mad_recv_wc);
761 }
762bad:
763 nack_recv(agent, mad_recv_wc, rmpp_status);
764 ib_free_recv_mad(mad_recv_wc);
765 return NULL;
766}
767
768static void process_rmpp_stop(struct ib_mad_agent_private *agent,
769 struct ib_mad_recv_wc *mad_recv_wc)
770{
771 struct ib_rmpp_mad *rmpp_mad;
772
773 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
774
775 if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) {
776 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
777 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
778 } else
779 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
780}
781
782static void process_rmpp_abort(struct ib_mad_agent_private *agent,
783 struct ib_mad_recv_wc *mad_recv_wc)
784{
785 struct ib_rmpp_mad *rmpp_mad;
786
787 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
788
789 if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN ||
790 rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) {
791 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
792 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
793 } else
794 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
795}
796
797struct ib_mad_recv_wc *
798ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent,
799 struct ib_mad_recv_wc *mad_recv_wc)
800{
801 struct ib_rmpp_mad *rmpp_mad;
802
803 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
804 if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE))
805 return mad_recv_wc;
806
807 if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) {
808 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
809 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
810 goto out;
811 }
812
813 switch (rmpp_mad->rmpp_hdr.rmpp_type) {
814 case IB_MGMT_RMPP_TYPE_DATA:
815 return process_rmpp_data(agent, mad_recv_wc);
816 case IB_MGMT_RMPP_TYPE_ACK:
817 process_rmpp_ack(agent, mad_recv_wc);
818 break;
819 case IB_MGMT_RMPP_TYPE_STOP:
820 process_rmpp_stop(agent, mad_recv_wc);
821 break;
822 case IB_MGMT_RMPP_TYPE_ABORT:
823 process_rmpp_abort(agent, mad_recv_wc);
824 break;
825 default:
826 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
827 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
828 break;
829 }
830out:
831 ib_free_recv_mad(mad_recv_wc);
832 return NULL;
833}
834
835static int init_newwin(struct ib_mad_send_wr_private *mad_send_wr)
836{
837 struct ib_mad_agent_private *agent = mad_send_wr->mad_agent_priv;
838 struct ib_mad_hdr *mad_hdr = mad_send_wr->send_buf.mad;
839 struct mad_rmpp_recv *rmpp_recv;
840 struct ib_ah_attr ah_attr;
841 unsigned long flags;
842 int newwin = 1;
843
844 if (!(mad_hdr->method & IB_MGMT_METHOD_RESP))
845 goto out;
846
847 spin_lock_irqsave(&agent->lock, flags);
848 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
849 if (rmpp_recv->tid != mad_hdr->tid ||
850 rmpp_recv->mgmt_class != mad_hdr->mgmt_class ||
851 rmpp_recv->class_version != mad_hdr->class_version ||
852 (rmpp_recv->method & IB_MGMT_METHOD_RESP))
853 continue;
854
855 if (ib_query_ah(mad_send_wr->send_buf.ah, &ah_attr))
856 continue;
857
858 if (rmpp_recv->slid == ah_attr.dlid) {
859 newwin = rmpp_recv->repwin;
860 break;
861 }
862 }
863 spin_unlock_irqrestore(&agent->lock, flags);
864out:
865 return newwin;
866}
867
868int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
869{
870 struct ib_rmpp_mad *rmpp_mad;
871 int ret;
872
873 rmpp_mad = mad_send_wr->send_buf.mad;
874 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
875 IB_MGMT_RMPP_FLAG_ACTIVE))
876 return IB_RMPP_RESULT_UNHANDLED;
877
878 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) {
879 mad_send_wr->seg_num = 1;
880 return IB_RMPP_RESULT_INTERNAL;
881 }
882
883 mad_send_wr->newwin = init_newwin(mad_send_wr);
884
885 /* We need to wait for the final ACK even if there isn't a response */
886 mad_send_wr->refcount += (mad_send_wr->timeout == 0);
887 ret = send_next_seg(mad_send_wr);
888 if (!ret)
889 return IB_RMPP_RESULT_CONSUMED;
890 return ret;
891}
892
893int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr,
894 struct ib_mad_send_wc *mad_send_wc)
895{
896 struct ib_rmpp_mad *rmpp_mad;
897 int ret;
898
899 rmpp_mad = mad_send_wr->send_buf.mad;
900 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
901 IB_MGMT_RMPP_FLAG_ACTIVE))
902 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
903
904 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
905 return IB_RMPP_RESULT_INTERNAL; /* ACK, STOP, or ABORT */
906
907 if (mad_send_wc->status != IB_WC_SUCCESS ||
908 mad_send_wr->status != IB_WC_SUCCESS)
909 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */
910
911 if (!mad_send_wr->timeout)
912 return IB_RMPP_RESULT_PROCESSED; /* Response received */
913
914 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
915 mad_send_wr->timeout =
916 msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
917 return IB_RMPP_RESULT_PROCESSED; /* Send done */
918 }
919
920 if (mad_send_wr->seg_num == mad_send_wr->newwin ||
921 mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count)
922 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */
923
924 ret = send_next_seg(mad_send_wr);
925 if (ret) {
926 mad_send_wc->status = IB_WC_GENERAL_ERR;
927 return IB_RMPP_RESULT_PROCESSED;
928 }
929 return IB_RMPP_RESULT_CONSUMED;
930}
931
932int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr)
933{
934 struct ib_rmpp_mad *rmpp_mad;
935 int ret;
936
937 rmpp_mad = mad_send_wr->send_buf.mad;
938 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
939 IB_MGMT_RMPP_FLAG_ACTIVE))
940 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
941
942 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count)
943 return IB_RMPP_RESULT_PROCESSED;
944
945 mad_send_wr->seg_num = mad_send_wr->last_ack;
946 mad_send_wr->cur_seg = mad_send_wr->last_ack_seg;
947
948 ret = send_next_seg(mad_send_wr);
949 if (ret)
950 return IB_RMPP_RESULT_PROCESSED;
951
952 return IB_RMPP_RESULT_CONSUMED;
953}
1/*
2 * Copyright (c) 2005 Intel Inc. All rights reserved.
3 * Copyright (c) 2005-2006 Voltaire, Inc. All rights reserved.
4 * Copyright (c) 2014 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/slab.h>
36
37#include "mad_priv.h"
38#include "mad_rmpp.h"
39
40enum rmpp_state {
41 RMPP_STATE_ACTIVE,
42 RMPP_STATE_TIMEOUT,
43 RMPP_STATE_COMPLETE,
44 RMPP_STATE_CANCELING
45};
46
47struct mad_rmpp_recv {
48 struct ib_mad_agent_private *agent;
49 struct list_head list;
50 struct delayed_work timeout_work;
51 struct delayed_work cleanup_work;
52 struct completion comp;
53 enum rmpp_state state;
54 spinlock_t lock;
55 atomic_t refcount;
56
57 struct ib_ah *ah;
58 struct ib_mad_recv_wc *rmpp_wc;
59 struct ib_mad_recv_buf *cur_seg_buf;
60 int last_ack;
61 int seg_num;
62 int newwin;
63 int repwin;
64
65 __be64 tid;
66 u32 src_qp;
67 u32 slid;
68 u8 mgmt_class;
69 u8 class_version;
70 u8 method;
71 u8 base_version;
72};
73
74static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
75{
76 if (atomic_dec_and_test(&rmpp_recv->refcount))
77 complete(&rmpp_recv->comp);
78}
79
80static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
81{
82 deref_rmpp_recv(rmpp_recv);
83 wait_for_completion(&rmpp_recv->comp);
84 rdma_destroy_ah(rmpp_recv->ah);
85 kfree(rmpp_recv);
86}
87
88void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent)
89{
90 struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv;
91 unsigned long flags;
92
93 spin_lock_irqsave(&agent->lock, flags);
94 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
95 if (rmpp_recv->state != RMPP_STATE_COMPLETE)
96 ib_free_recv_mad(rmpp_recv->rmpp_wc);
97 rmpp_recv->state = RMPP_STATE_CANCELING;
98 }
99 spin_unlock_irqrestore(&agent->lock, flags);
100
101 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
102 cancel_delayed_work(&rmpp_recv->timeout_work);
103 cancel_delayed_work(&rmpp_recv->cleanup_work);
104 }
105
106 flush_workqueue(agent->qp_info->port_priv->wq);
107
108 list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv,
109 &agent->rmpp_list, list) {
110 list_del(&rmpp_recv->list);
111 destroy_rmpp_recv(rmpp_recv);
112 }
113}
114
115static void format_ack(struct ib_mad_send_buf *msg,
116 struct ib_rmpp_mad *data,
117 struct mad_rmpp_recv *rmpp_recv)
118{
119 struct ib_rmpp_mad *ack = msg->mad;
120 unsigned long flags;
121
122 memcpy(ack, &data->mad_hdr, msg->hdr_len);
123
124 ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
125 ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK;
126 ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
127
128 spin_lock_irqsave(&rmpp_recv->lock, flags);
129 rmpp_recv->last_ack = rmpp_recv->seg_num;
130 ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num);
131 ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin);
132 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
133}
134
135static void ack_recv(struct mad_rmpp_recv *rmpp_recv,
136 struct ib_mad_recv_wc *recv_wc)
137{
138 struct ib_mad_send_buf *msg;
139 int ret, hdr_len;
140
141 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
142 msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp,
143 recv_wc->wc->pkey_index, 1, hdr_len,
144 0, GFP_KERNEL,
145 IB_MGMT_BASE_VERSION);
146 if (IS_ERR(msg))
147 return;
148
149 format_ack(msg, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv);
150 msg->ah = rmpp_recv->ah;
151 ret = ib_post_send_mad(msg, NULL);
152 if (ret)
153 ib_free_send_mad(msg);
154}
155
156static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent,
157 struct ib_mad_recv_wc *recv_wc)
158{
159 struct ib_mad_send_buf *msg;
160 struct ib_ah *ah;
161 int hdr_len;
162
163 ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc,
164 recv_wc->recv_buf.grh, agent->port_num);
165 if (IS_ERR(ah))
166 return (void *) ah;
167
168 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
169 msg = ib_create_send_mad(agent, recv_wc->wc->src_qp,
170 recv_wc->wc->pkey_index, 1,
171 hdr_len, 0, GFP_KERNEL,
172 IB_MGMT_BASE_VERSION);
173 if (IS_ERR(msg))
174 rdma_destroy_ah(ah);
175 else {
176 msg->ah = ah;
177 msg->context[0] = ah;
178 }
179
180 return msg;
181}
182
183static void ack_ds_ack(struct ib_mad_agent_private *agent,
184 struct ib_mad_recv_wc *recv_wc)
185{
186 struct ib_mad_send_buf *msg;
187 struct ib_rmpp_mad *rmpp_mad;
188 int ret;
189
190 msg = alloc_response_msg(&agent->agent, recv_wc);
191 if (IS_ERR(msg))
192 return;
193
194 rmpp_mad = msg->mad;
195 memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
196
197 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
198 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
199 rmpp_mad->rmpp_hdr.seg_num = 0;
200 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(1);
201
202 ret = ib_post_send_mad(msg, NULL);
203 if (ret) {
204 rdma_destroy_ah(msg->ah);
205 ib_free_send_mad(msg);
206 }
207}
208
209void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc)
210{
211 if (mad_send_wc->send_buf->context[0] == mad_send_wc->send_buf->ah)
212 rdma_destroy_ah(mad_send_wc->send_buf->ah);
213 ib_free_send_mad(mad_send_wc->send_buf);
214}
215
216static void nack_recv(struct ib_mad_agent_private *agent,
217 struct ib_mad_recv_wc *recv_wc, u8 rmpp_status)
218{
219 struct ib_mad_send_buf *msg;
220 struct ib_rmpp_mad *rmpp_mad;
221 int ret;
222
223 msg = alloc_response_msg(&agent->agent, recv_wc);
224 if (IS_ERR(msg))
225 return;
226
227 rmpp_mad = msg->mad;
228 memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
229
230 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
231 rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION;
232 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ABORT;
233 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
234 rmpp_mad->rmpp_hdr.rmpp_status = rmpp_status;
235 rmpp_mad->rmpp_hdr.seg_num = 0;
236 rmpp_mad->rmpp_hdr.paylen_newwin = 0;
237
238 ret = ib_post_send_mad(msg, NULL);
239 if (ret) {
240 rdma_destroy_ah(msg->ah);
241 ib_free_send_mad(msg);
242 }
243}
244
245static void recv_timeout_handler(struct work_struct *work)
246{
247 struct mad_rmpp_recv *rmpp_recv =
248 container_of(work, struct mad_rmpp_recv, timeout_work.work);
249 struct ib_mad_recv_wc *rmpp_wc;
250 unsigned long flags;
251
252 spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
253 if (rmpp_recv->state != RMPP_STATE_ACTIVE) {
254 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
255 return;
256 }
257 rmpp_recv->state = RMPP_STATE_TIMEOUT;
258 list_del(&rmpp_recv->list);
259 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
260
261 rmpp_wc = rmpp_recv->rmpp_wc;
262 nack_recv(rmpp_recv->agent, rmpp_wc, IB_MGMT_RMPP_STATUS_T2L);
263 destroy_rmpp_recv(rmpp_recv);
264 ib_free_recv_mad(rmpp_wc);
265}
266
267static void recv_cleanup_handler(struct work_struct *work)
268{
269 struct mad_rmpp_recv *rmpp_recv =
270 container_of(work, struct mad_rmpp_recv, cleanup_work.work);
271 unsigned long flags;
272
273 spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
274 if (rmpp_recv->state == RMPP_STATE_CANCELING) {
275 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
276 return;
277 }
278 list_del(&rmpp_recv->list);
279 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
280 destroy_rmpp_recv(rmpp_recv);
281}
282
283static struct mad_rmpp_recv *
284create_rmpp_recv(struct ib_mad_agent_private *agent,
285 struct ib_mad_recv_wc *mad_recv_wc)
286{
287 struct mad_rmpp_recv *rmpp_recv;
288 struct ib_mad_hdr *mad_hdr;
289
290 rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL);
291 if (!rmpp_recv)
292 return NULL;
293
294 rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd,
295 mad_recv_wc->wc,
296 mad_recv_wc->recv_buf.grh,
297 agent->agent.port_num);
298 if (IS_ERR(rmpp_recv->ah))
299 goto error;
300
301 rmpp_recv->agent = agent;
302 init_completion(&rmpp_recv->comp);
303 INIT_DELAYED_WORK(&rmpp_recv->timeout_work, recv_timeout_handler);
304 INIT_DELAYED_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler);
305 spin_lock_init(&rmpp_recv->lock);
306 rmpp_recv->state = RMPP_STATE_ACTIVE;
307 atomic_set(&rmpp_recv->refcount, 1);
308
309 rmpp_recv->rmpp_wc = mad_recv_wc;
310 rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf;
311 rmpp_recv->newwin = 1;
312 rmpp_recv->seg_num = 1;
313 rmpp_recv->last_ack = 0;
314 rmpp_recv->repwin = 1;
315
316 mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
317 rmpp_recv->tid = mad_hdr->tid;
318 rmpp_recv->src_qp = mad_recv_wc->wc->src_qp;
319 rmpp_recv->slid = mad_recv_wc->wc->slid;
320 rmpp_recv->mgmt_class = mad_hdr->mgmt_class;
321 rmpp_recv->class_version = mad_hdr->class_version;
322 rmpp_recv->method = mad_hdr->method;
323 rmpp_recv->base_version = mad_hdr->base_version;
324 return rmpp_recv;
325
326error: kfree(rmpp_recv);
327 return NULL;
328}
329
330static struct mad_rmpp_recv *
331find_rmpp_recv(struct ib_mad_agent_private *agent,
332 struct ib_mad_recv_wc *mad_recv_wc)
333{
334 struct mad_rmpp_recv *rmpp_recv;
335 struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
336
337 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
338 if (rmpp_recv->tid == mad_hdr->tid &&
339 rmpp_recv->src_qp == mad_recv_wc->wc->src_qp &&
340 rmpp_recv->slid == mad_recv_wc->wc->slid &&
341 rmpp_recv->mgmt_class == mad_hdr->mgmt_class &&
342 rmpp_recv->class_version == mad_hdr->class_version &&
343 rmpp_recv->method == mad_hdr->method)
344 return rmpp_recv;
345 }
346 return NULL;
347}
348
349static struct mad_rmpp_recv *
350acquire_rmpp_recv(struct ib_mad_agent_private *agent,
351 struct ib_mad_recv_wc *mad_recv_wc)
352{
353 struct mad_rmpp_recv *rmpp_recv;
354 unsigned long flags;
355
356 spin_lock_irqsave(&agent->lock, flags);
357 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
358 if (rmpp_recv)
359 atomic_inc(&rmpp_recv->refcount);
360 spin_unlock_irqrestore(&agent->lock, flags);
361 return rmpp_recv;
362}
363
364static struct mad_rmpp_recv *
365insert_rmpp_recv(struct ib_mad_agent_private *agent,
366 struct mad_rmpp_recv *rmpp_recv)
367{
368 struct mad_rmpp_recv *cur_rmpp_recv;
369
370 cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc);
371 if (!cur_rmpp_recv)
372 list_add_tail(&rmpp_recv->list, &agent->rmpp_list);
373
374 return cur_rmpp_recv;
375}
376
377static inline int get_last_flag(struct ib_mad_recv_buf *seg)
378{
379 struct ib_rmpp_mad *rmpp_mad;
380
381 rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
382 return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST;
383}
384
385static inline int get_seg_num(struct ib_mad_recv_buf *seg)
386{
387 struct ib_rmpp_mad *rmpp_mad;
388
389 rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
390 return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
391}
392
393static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list,
394 struct ib_mad_recv_buf *seg)
395{
396 if (seg->list.next == rmpp_list)
397 return NULL;
398
399 return container_of(seg->list.next, struct ib_mad_recv_buf, list);
400}
401
402static inline int window_size(struct ib_mad_agent_private *agent)
403{
404 return max(agent->qp_info->recv_queue.max_active >> 3, 1);
405}
406
407static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list,
408 int seg_num)
409{
410 struct ib_mad_recv_buf *seg_buf;
411 int cur_seg_num;
412
413 list_for_each_entry_reverse(seg_buf, rmpp_list, list) {
414 cur_seg_num = get_seg_num(seg_buf);
415 if (seg_num > cur_seg_num)
416 return seg_buf;
417 if (seg_num == cur_seg_num)
418 break;
419 }
420 return NULL;
421}
422
423static void update_seg_num(struct mad_rmpp_recv *rmpp_recv,
424 struct ib_mad_recv_buf *new_buf)
425{
426 struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list;
427
428 while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) {
429 rmpp_recv->cur_seg_buf = new_buf;
430 rmpp_recv->seg_num++;
431 new_buf = get_next_seg(rmpp_list, new_buf);
432 }
433}
434
435static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv)
436{
437 struct ib_rmpp_mad *rmpp_mad;
438 int hdr_size, data_size, pad;
439 bool opa = rdma_cap_opa_mad(rmpp_recv->agent->qp_info->port_priv->device,
440 rmpp_recv->agent->qp_info->port_priv->port_num);
441
442 rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad;
443
444 hdr_size = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
445 if (opa && rmpp_recv->base_version == OPA_MGMT_BASE_VERSION) {
446 data_size = sizeof(struct opa_rmpp_mad) - hdr_size;
447 pad = OPA_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
448 if (pad > OPA_MGMT_RMPP_DATA || pad < 0)
449 pad = 0;
450 } else {
451 data_size = sizeof(struct ib_rmpp_mad) - hdr_size;
452 pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
453 if (pad > IB_MGMT_RMPP_DATA || pad < 0)
454 pad = 0;
455 }
456
457 return hdr_size + rmpp_recv->seg_num * data_size - pad;
458}
459
460static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv)
461{
462 struct ib_mad_recv_wc *rmpp_wc;
463
464 ack_recv(rmpp_recv, rmpp_recv->rmpp_wc);
465 if (rmpp_recv->seg_num > 1)
466 cancel_delayed_work(&rmpp_recv->timeout_work);
467
468 rmpp_wc = rmpp_recv->rmpp_wc;
469 rmpp_wc->mad_len = get_mad_len(rmpp_recv);
470 /* 10 seconds until we can find the packet lifetime */
471 queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq,
472 &rmpp_recv->cleanup_work, msecs_to_jiffies(10000));
473 return rmpp_wc;
474}
475
476static struct ib_mad_recv_wc *
477continue_rmpp(struct ib_mad_agent_private *agent,
478 struct ib_mad_recv_wc *mad_recv_wc)
479{
480 struct mad_rmpp_recv *rmpp_recv;
481 struct ib_mad_recv_buf *prev_buf;
482 struct ib_mad_recv_wc *done_wc;
483 int seg_num;
484 unsigned long flags;
485
486 rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc);
487 if (!rmpp_recv)
488 goto drop1;
489
490 seg_num = get_seg_num(&mad_recv_wc->recv_buf);
491
492 spin_lock_irqsave(&rmpp_recv->lock, flags);
493 if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) ||
494 (seg_num > rmpp_recv->newwin))
495 goto drop3;
496
497 if ((seg_num <= rmpp_recv->last_ack) ||
498 (rmpp_recv->state == RMPP_STATE_COMPLETE)) {
499 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
500 ack_recv(rmpp_recv, mad_recv_wc);
501 goto drop2;
502 }
503
504 prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num);
505 if (!prev_buf)
506 goto drop3;
507
508 done_wc = NULL;
509 list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list);
510 if (rmpp_recv->cur_seg_buf == prev_buf) {
511 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf);
512 if (get_last_flag(rmpp_recv->cur_seg_buf)) {
513 rmpp_recv->state = RMPP_STATE_COMPLETE;
514 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
515 done_wc = complete_rmpp(rmpp_recv);
516 goto out;
517 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) {
518 rmpp_recv->newwin += window_size(agent);
519 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
520 ack_recv(rmpp_recv, mad_recv_wc);
521 goto out;
522 }
523 }
524 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
525out:
526 deref_rmpp_recv(rmpp_recv);
527 return done_wc;
528
529drop3: spin_unlock_irqrestore(&rmpp_recv->lock, flags);
530drop2: deref_rmpp_recv(rmpp_recv);
531drop1: ib_free_recv_mad(mad_recv_wc);
532 return NULL;
533}
534
535static struct ib_mad_recv_wc *
536start_rmpp(struct ib_mad_agent_private *agent,
537 struct ib_mad_recv_wc *mad_recv_wc)
538{
539 struct mad_rmpp_recv *rmpp_recv;
540 unsigned long flags;
541
542 rmpp_recv = create_rmpp_recv(agent, mad_recv_wc);
543 if (!rmpp_recv) {
544 ib_free_recv_mad(mad_recv_wc);
545 return NULL;
546 }
547
548 spin_lock_irqsave(&agent->lock, flags);
549 if (insert_rmpp_recv(agent, rmpp_recv)) {
550 spin_unlock_irqrestore(&agent->lock, flags);
551 /* duplicate first MAD */
552 destroy_rmpp_recv(rmpp_recv);
553 return continue_rmpp(agent, mad_recv_wc);
554 }
555 atomic_inc(&rmpp_recv->refcount);
556
557 if (get_last_flag(&mad_recv_wc->recv_buf)) {
558 rmpp_recv->state = RMPP_STATE_COMPLETE;
559 spin_unlock_irqrestore(&agent->lock, flags);
560 complete_rmpp(rmpp_recv);
561 } else {
562 spin_unlock_irqrestore(&agent->lock, flags);
563 /* 40 seconds until we can find the packet lifetimes */
564 queue_delayed_work(agent->qp_info->port_priv->wq,
565 &rmpp_recv->timeout_work,
566 msecs_to_jiffies(40000));
567 rmpp_recv->newwin += window_size(agent);
568 ack_recv(rmpp_recv, mad_recv_wc);
569 mad_recv_wc = NULL;
570 }
571 deref_rmpp_recv(rmpp_recv);
572 return mad_recv_wc;
573}
574
575static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr)
576{
577 struct ib_rmpp_mad *rmpp_mad;
578 int timeout;
579 u32 paylen = 0;
580
581 rmpp_mad = mad_send_wr->send_buf.mad;
582 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
583 rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num);
584
585 if (mad_send_wr->seg_num == 1) {
586 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST;
587 paylen = (mad_send_wr->send_buf.seg_count *
588 mad_send_wr->send_buf.seg_rmpp_size) -
589 mad_send_wr->pad;
590 }
591
592 if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) {
593 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST;
594 paylen = mad_send_wr->send_buf.seg_rmpp_size - mad_send_wr->pad;
595 }
596 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
597
598 /* 2 seconds for an ACK until we can find the packet lifetime */
599 timeout = mad_send_wr->send_buf.timeout_ms;
600 if (!timeout || timeout > 2000)
601 mad_send_wr->timeout = msecs_to_jiffies(2000);
602
603 return ib_send_mad(mad_send_wr);
604}
605
606static void abort_send(struct ib_mad_agent_private *agent,
607 struct ib_mad_recv_wc *mad_recv_wc, u8 rmpp_status)
608{
609 struct ib_mad_send_wr_private *mad_send_wr;
610 struct ib_mad_send_wc wc;
611 unsigned long flags;
612
613 spin_lock_irqsave(&agent->lock, flags);
614 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
615 if (!mad_send_wr)
616 goto out; /* Unmatched send */
617
618 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
619 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
620 goto out; /* Send is already done */
621
622 ib_mark_mad_done(mad_send_wr);
623 spin_unlock_irqrestore(&agent->lock, flags);
624
625 wc.status = IB_WC_REM_ABORT_ERR;
626 wc.vendor_err = rmpp_status;
627 wc.send_buf = &mad_send_wr->send_buf;
628 ib_mad_complete_send_wr(mad_send_wr, &wc);
629 return;
630out:
631 spin_unlock_irqrestore(&agent->lock, flags);
632}
633
634static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr,
635 int seg_num)
636{
637 struct list_head *list;
638
639 wr->last_ack = seg_num;
640 list = &wr->last_ack_seg->list;
641 list_for_each_entry(wr->last_ack_seg, list, list)
642 if (wr->last_ack_seg->num == seg_num)
643 break;
644}
645
646static void process_ds_ack(struct ib_mad_agent_private *agent,
647 struct ib_mad_recv_wc *mad_recv_wc, int newwin)
648{
649 struct mad_rmpp_recv *rmpp_recv;
650
651 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
652 if (rmpp_recv && rmpp_recv->state == RMPP_STATE_COMPLETE)
653 rmpp_recv->repwin = newwin;
654}
655
656static void process_rmpp_ack(struct ib_mad_agent_private *agent,
657 struct ib_mad_recv_wc *mad_recv_wc)
658{
659 struct ib_mad_send_wr_private *mad_send_wr;
660 struct ib_rmpp_mad *rmpp_mad;
661 unsigned long flags;
662 int seg_num, newwin, ret;
663
664 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
665 if (rmpp_mad->rmpp_hdr.rmpp_status) {
666 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
667 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
668 return;
669 }
670
671 seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
672 newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
673 if (newwin < seg_num) {
674 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
675 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
676 return;
677 }
678
679 spin_lock_irqsave(&agent->lock, flags);
680 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
681 if (!mad_send_wr) {
682 if (!seg_num)
683 process_ds_ack(agent, mad_recv_wc, newwin);
684 goto out; /* Unmatched or DS RMPP ACK */
685 }
686
687 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) &&
688 (mad_send_wr->timeout)) {
689 spin_unlock_irqrestore(&agent->lock, flags);
690 ack_ds_ack(agent, mad_recv_wc);
691 return; /* Repeated ACK for DS RMPP transaction */
692 }
693
694 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
695 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
696 goto out; /* Send is already done */
697
698 if (seg_num > mad_send_wr->send_buf.seg_count ||
699 seg_num > mad_send_wr->newwin) {
700 spin_unlock_irqrestore(&agent->lock, flags);
701 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
702 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
703 return;
704 }
705
706 if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack)
707 goto out; /* Old ACK */
708
709 if (seg_num > mad_send_wr->last_ack) {
710 adjust_last_ack(mad_send_wr, seg_num);
711 mad_send_wr->retries_left = mad_send_wr->max_retries;
712 }
713 mad_send_wr->newwin = newwin;
714 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
715 /* If no response is expected, the ACK completes the send */
716 if (!mad_send_wr->send_buf.timeout_ms) {
717 struct ib_mad_send_wc wc;
718
719 ib_mark_mad_done(mad_send_wr);
720 spin_unlock_irqrestore(&agent->lock, flags);
721
722 wc.status = IB_WC_SUCCESS;
723 wc.vendor_err = 0;
724 wc.send_buf = &mad_send_wr->send_buf;
725 ib_mad_complete_send_wr(mad_send_wr, &wc);
726 return;
727 }
728 if (mad_send_wr->refcount == 1)
729 ib_reset_mad_timeout(mad_send_wr,
730 mad_send_wr->send_buf.timeout_ms);
731 spin_unlock_irqrestore(&agent->lock, flags);
732 ack_ds_ack(agent, mad_recv_wc);
733 return;
734 } else if (mad_send_wr->refcount == 1 &&
735 mad_send_wr->seg_num < mad_send_wr->newwin &&
736 mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) {
737 /* Send failure will just result in a timeout/retry */
738 ret = send_next_seg(mad_send_wr);
739 if (ret)
740 goto out;
741
742 mad_send_wr->refcount++;
743 list_move_tail(&mad_send_wr->agent_list,
744 &mad_send_wr->mad_agent_priv->send_list);
745 }
746out:
747 spin_unlock_irqrestore(&agent->lock, flags);
748}
749
750static struct ib_mad_recv_wc *
751process_rmpp_data(struct ib_mad_agent_private *agent,
752 struct ib_mad_recv_wc *mad_recv_wc)
753{
754 struct ib_rmpp_hdr *rmpp_hdr;
755 u8 rmpp_status;
756
757 rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr;
758
759 if (rmpp_hdr->rmpp_status) {
760 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS;
761 goto bad;
762 }
763
764 if (rmpp_hdr->seg_num == cpu_to_be32(1)) {
765 if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) {
766 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
767 goto bad;
768 }
769 return start_rmpp(agent, mad_recv_wc);
770 } else {
771 if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) {
772 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
773 goto bad;
774 }
775 return continue_rmpp(agent, mad_recv_wc);
776 }
777bad:
778 nack_recv(agent, mad_recv_wc, rmpp_status);
779 ib_free_recv_mad(mad_recv_wc);
780 return NULL;
781}
782
783static void process_rmpp_stop(struct ib_mad_agent_private *agent,
784 struct ib_mad_recv_wc *mad_recv_wc)
785{
786 struct ib_rmpp_mad *rmpp_mad;
787
788 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
789
790 if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) {
791 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
792 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
793 } else
794 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
795}
796
797static void process_rmpp_abort(struct ib_mad_agent_private *agent,
798 struct ib_mad_recv_wc *mad_recv_wc)
799{
800 struct ib_rmpp_mad *rmpp_mad;
801
802 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
803
804 if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN ||
805 rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) {
806 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
807 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
808 } else
809 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
810}
811
812struct ib_mad_recv_wc *
813ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent,
814 struct ib_mad_recv_wc *mad_recv_wc)
815{
816 struct ib_rmpp_mad *rmpp_mad;
817
818 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
819 if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE))
820 return mad_recv_wc;
821
822 if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) {
823 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
824 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
825 goto out;
826 }
827
828 switch (rmpp_mad->rmpp_hdr.rmpp_type) {
829 case IB_MGMT_RMPP_TYPE_DATA:
830 return process_rmpp_data(agent, mad_recv_wc);
831 case IB_MGMT_RMPP_TYPE_ACK:
832 process_rmpp_ack(agent, mad_recv_wc);
833 break;
834 case IB_MGMT_RMPP_TYPE_STOP:
835 process_rmpp_stop(agent, mad_recv_wc);
836 break;
837 case IB_MGMT_RMPP_TYPE_ABORT:
838 process_rmpp_abort(agent, mad_recv_wc);
839 break;
840 default:
841 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
842 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
843 break;
844 }
845out:
846 ib_free_recv_mad(mad_recv_wc);
847 return NULL;
848}
849
850static int init_newwin(struct ib_mad_send_wr_private *mad_send_wr)
851{
852 struct ib_mad_agent_private *agent = mad_send_wr->mad_agent_priv;
853 struct ib_mad_hdr *mad_hdr = mad_send_wr->send_buf.mad;
854 struct mad_rmpp_recv *rmpp_recv;
855 struct rdma_ah_attr ah_attr;
856 unsigned long flags;
857 int newwin = 1;
858
859 if (!(mad_hdr->method & IB_MGMT_METHOD_RESP))
860 goto out;
861
862 spin_lock_irqsave(&agent->lock, flags);
863 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
864 if (rmpp_recv->tid != mad_hdr->tid ||
865 rmpp_recv->mgmt_class != mad_hdr->mgmt_class ||
866 rmpp_recv->class_version != mad_hdr->class_version ||
867 (rmpp_recv->method & IB_MGMT_METHOD_RESP))
868 continue;
869
870 if (rdma_query_ah(mad_send_wr->send_buf.ah, &ah_attr))
871 continue;
872
873 if (rmpp_recv->slid == rdma_ah_get_dlid(&ah_attr)) {
874 newwin = rmpp_recv->repwin;
875 break;
876 }
877 }
878 spin_unlock_irqrestore(&agent->lock, flags);
879out:
880 return newwin;
881}
882
883int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
884{
885 struct ib_rmpp_mad *rmpp_mad;
886 int ret;
887
888 rmpp_mad = mad_send_wr->send_buf.mad;
889 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
890 IB_MGMT_RMPP_FLAG_ACTIVE))
891 return IB_RMPP_RESULT_UNHANDLED;
892
893 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) {
894 mad_send_wr->seg_num = 1;
895 return IB_RMPP_RESULT_INTERNAL;
896 }
897
898 mad_send_wr->newwin = init_newwin(mad_send_wr);
899
900 /* We need to wait for the final ACK even if there isn't a response */
901 mad_send_wr->refcount += (mad_send_wr->timeout == 0);
902 ret = send_next_seg(mad_send_wr);
903 if (!ret)
904 return IB_RMPP_RESULT_CONSUMED;
905 return ret;
906}
907
908int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr,
909 struct ib_mad_send_wc *mad_send_wc)
910{
911 struct ib_rmpp_mad *rmpp_mad;
912 int ret;
913
914 rmpp_mad = mad_send_wr->send_buf.mad;
915 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
916 IB_MGMT_RMPP_FLAG_ACTIVE))
917 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
918
919 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
920 return IB_RMPP_RESULT_INTERNAL; /* ACK, STOP, or ABORT */
921
922 if (mad_send_wc->status != IB_WC_SUCCESS ||
923 mad_send_wr->status != IB_WC_SUCCESS)
924 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */
925
926 if (!mad_send_wr->timeout)
927 return IB_RMPP_RESULT_PROCESSED; /* Response received */
928
929 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
930 mad_send_wr->timeout =
931 msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
932 return IB_RMPP_RESULT_PROCESSED; /* Send done */
933 }
934
935 if (mad_send_wr->seg_num == mad_send_wr->newwin ||
936 mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count)
937 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */
938
939 ret = send_next_seg(mad_send_wr);
940 if (ret) {
941 mad_send_wc->status = IB_WC_GENERAL_ERR;
942 return IB_RMPP_RESULT_PROCESSED;
943 }
944 return IB_RMPP_RESULT_CONSUMED;
945}
946
947int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr)
948{
949 struct ib_rmpp_mad *rmpp_mad;
950 int ret;
951
952 rmpp_mad = mad_send_wr->send_buf.mad;
953 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
954 IB_MGMT_RMPP_FLAG_ACTIVE))
955 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
956
957 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count)
958 return IB_RMPP_RESULT_PROCESSED;
959
960 mad_send_wr->seg_num = mad_send_wr->last_ack;
961 mad_send_wr->cur_seg = mad_send_wr->last_ack_seg;
962
963 ret = send_next_seg(mad_send_wr);
964 if (ret)
965 return IB_RMPP_RESULT_PROCESSED;
966
967 return IB_RMPP_RESULT_CONSUMED;
968}