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added 2.6.29.6 aldebaran kernel
[nao-ulib.git] / kernel / 2.6.29.6-aldebaran-rt / drivers / infiniband / core / mad_rmpp.c
blob3af2b84cd838445da6c55bddd670eb26c69e3143
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 "mad_priv.h"
35 #include "mad_rmpp.h"
36
37 enum rmpp_state {
38 RMPP_STATE_ACTIVE,
39 RMPP_STATE_TIMEOUT,
40 RMPP_STATE_COMPLETE
41 };
42
43 struct mad_rmpp_recv {
44 struct ib_mad_agent_private *agent;
45 struct list_head list;
46 struct delayed_work timeout_work;
47 struct delayed_work cleanup_work;
48 struct completion comp;
49 enum rmpp_state state;
50 spinlock_t lock;
51 atomic_t refcount;
52
53 struct ib_ah *ah;
54 struct ib_mad_recv_wc *rmpp_wc;
55 struct ib_mad_recv_buf *cur_seg_buf;
56 int last_ack;
57 int seg_num;
58 int newwin;
59 int repwin;
60
61 __be64 tid;
62 u32 src_qp;
63 u16 slid;
64 u8 mgmt_class;
65 u8 class_version;
66 u8 method;
67 };
68
69 static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
70 {
71 if (atomic_dec_and_test(&rmpp_recv->refcount))
72 complete(&rmpp_recv->comp);
73 }
74
75 static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
76 {
77 deref_rmpp_recv(rmpp_recv);
78 wait_for_completion(&rmpp_recv->comp);
79 ib_destroy_ah(rmpp_recv->ah);
80 kfree(rmpp_recv);
81 }
82
83 void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent)
84 {
85 struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv;
86 unsigned long flags;
87
88 spin_lock_irqsave(&agent->lock, flags);
89 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
90 cancel_delayed_work(&rmpp_recv->timeout_work);
91 cancel_delayed_work(&rmpp_recv->cleanup_work);
92 }
93 spin_unlock_irqrestore(&agent->lock, flags);
94
95 flush_workqueue(agent->qp_info->port_priv->wq);
96
97 list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv,
98 &agent->rmpp_list, list) {
99 list_del(&rmpp_recv->list);
100 if (rmpp_recv->state != RMPP_STATE_COMPLETE)
101 ib_free_recv_mad(rmpp_recv->rmpp_wc);
102 destroy_rmpp_recv(rmpp_recv);
103 }
104 }
105
106 static void format_ack(struct ib_mad_send_buf *msg,
107 struct ib_rmpp_mad *data,
108 struct mad_rmpp_recv *rmpp_recv)
109 {
110 struct ib_rmpp_mad *ack = msg->mad;
111 unsigned long flags;
112
113 memcpy(ack, &data->mad_hdr, msg->hdr_len);
114
115 ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
116 ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK;
117 ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
118
119 spin_lock_irqsave(&rmpp_recv->lock, flags);
120 rmpp_recv->last_ack = rmpp_recv->seg_num;
121 ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num);
122 ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin);
123 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
124 }
125
126 static void ack_recv(struct mad_rmpp_recv *rmpp_recv,
127 struct ib_mad_recv_wc *recv_wc)
128 {
129 struct ib_mad_send_buf *msg;
130 int ret, hdr_len;
131
132 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
133 msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp,
134 recv_wc->wc->pkey_index, 1, hdr_len,
135 0, GFP_KERNEL);
136 if (IS_ERR(msg))
137 return;
138
139 format_ack(msg, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv);
140 msg->ah = rmpp_recv->ah;
141 ret = ib_post_send_mad(msg, NULL);
142 if (ret)
143 ib_free_send_mad(msg);
144 }
145
146 static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent,
147 struct ib_mad_recv_wc *recv_wc)
148 {
149 struct ib_mad_send_buf *msg;
150 struct ib_ah *ah;
151 int hdr_len;
152
153 ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc,
154 recv_wc->recv_buf.grh, agent->port_num);
155 if (IS_ERR(ah))
156 return (void *) ah;
157
158 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
159 msg = ib_create_send_mad(agent, recv_wc->wc->src_qp,
160 recv_wc->wc->pkey_index, 1,
161 hdr_len, 0, GFP_KERNEL);
162 if (IS_ERR(msg))
163 ib_destroy_ah(ah);
164 else {
165 msg->ah = ah;
166 msg->context[0] = ah;
167 }
168
169 return msg;
170 }
171
172 static void ack_ds_ack(struct ib_mad_agent_private *agent,
173 struct ib_mad_recv_wc *recv_wc)
174 {
175 struct ib_mad_send_buf *msg;
176 struct ib_rmpp_mad *rmpp_mad;
177 int ret;
178
179 msg = alloc_response_msg(&agent->agent, recv_wc);
180 if (IS_ERR(msg))
181 return;
182
183 rmpp_mad = msg->mad;
184 memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
185
186 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
187 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
188 rmpp_mad->rmpp_hdr.seg_num = 0;
189 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(1);
190
191 ret = ib_post_send_mad(msg, NULL);
192 if (ret) {
193 ib_destroy_ah(msg->ah);
194 ib_free_send_mad(msg);
195 }
196 }
197
198 void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc)
199 {
200 if (mad_send_wc->send_buf->context[0] == mad_send_wc->send_buf->ah)
201 ib_destroy_ah(mad_send_wc->send_buf->ah);
202 ib_free_send_mad(mad_send_wc->send_buf);
203 }
204
205 static void nack_recv(struct ib_mad_agent_private *agent,
206 struct ib_mad_recv_wc *recv_wc, u8 rmpp_status)
207 {
208 struct ib_mad_send_buf *msg;
209 struct ib_rmpp_mad *rmpp_mad;
210 int ret;
211
212 msg = alloc_response_msg(&agent->agent, recv_wc);
213 if (IS_ERR(msg))
214 return;
215
216 rmpp_mad = msg->mad;
217 memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
218
219 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
220 rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION;
221 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ABORT;
222 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
223 rmpp_mad->rmpp_hdr.rmpp_status = rmpp_status;
224 rmpp_mad->rmpp_hdr.seg_num = 0;
225 rmpp_mad->rmpp_hdr.paylen_newwin = 0;
226
227 ret = ib_post_send_mad(msg, NULL);
228 if (ret) {
229 ib_destroy_ah(msg->ah);
230 ib_free_send_mad(msg);
231 }
232 }
233
234 static void recv_timeout_handler(struct work_struct *work)
235 {
236 struct mad_rmpp_recv *rmpp_recv =
237 container_of(work, struct mad_rmpp_recv, timeout_work.work);
238 struct ib_mad_recv_wc *rmpp_wc;
239 unsigned long flags;
240
241 spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
242 if (rmpp_recv->state != RMPP_STATE_ACTIVE) {
243 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
244 return;
245 }
246 rmpp_recv->state = RMPP_STATE_TIMEOUT;
247 list_del(&rmpp_recv->list);
248 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
249
250 rmpp_wc = rmpp_recv->rmpp_wc;
251 nack_recv(rmpp_recv->agent, rmpp_wc, IB_MGMT_RMPP_STATUS_T2L);
252 destroy_rmpp_recv(rmpp_recv);
253 ib_free_recv_mad(rmpp_wc);
254 }
255
256 static void recv_cleanup_handler(struct work_struct *work)
257 {
258 struct mad_rmpp_recv *rmpp_recv =
259 container_of(work, struct mad_rmpp_recv, cleanup_work.work);
260 unsigned long flags;
261
262 spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
263 list_del(&rmpp_recv->list);
264 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
265 destroy_rmpp_recv(rmpp_recv);
266 }
267
268 static struct mad_rmpp_recv *
269 create_rmpp_recv(struct ib_mad_agent_private *agent,
270 struct ib_mad_recv_wc *mad_recv_wc)
271 {
272 struct mad_rmpp_recv *rmpp_recv;
273 struct ib_mad_hdr *mad_hdr;
274
275 rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL);
276 if (!rmpp_recv)
277 return NULL;
278
279 rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd,
280 mad_recv_wc->wc,
281 mad_recv_wc->recv_buf.grh,
282 agent->agent.port_num);
283 if (IS_ERR(rmpp_recv->ah))
284 goto error;
285
286 rmpp_recv->agent = agent;
287 init_completion(&rmpp_recv->comp);
288 INIT_DELAYED_WORK(&rmpp_recv->timeout_work, recv_timeout_handler);
289 INIT_DELAYED_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler);
290 spin_lock_init(&rmpp_recv->lock);
291 rmpp_recv->state = RMPP_STATE_ACTIVE;
292 atomic_set(&rmpp_recv->refcount, 1);
293
294 rmpp_recv->rmpp_wc = mad_recv_wc;
295 rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf;
296 rmpp_recv->newwin = 1;
297 rmpp_recv->seg_num = 1;
298 rmpp_recv->last_ack = 0;
299 rmpp_recv->repwin = 1;
300
301 mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
302 rmpp_recv->tid = mad_hdr->tid;
303 rmpp_recv->src_qp = mad_recv_wc->wc->src_qp;
304 rmpp_recv->slid = mad_recv_wc->wc->slid;
305 rmpp_recv->mgmt_class = mad_hdr->mgmt_class;
306 rmpp_recv->class_version = mad_hdr->class_version;
307 rmpp_recv->method = mad_hdr->method;
308 return rmpp_recv;
309
310 error: kfree(rmpp_recv);
311 return NULL;
312 }
313
314 static struct mad_rmpp_recv *
315 find_rmpp_recv(struct ib_mad_agent_private *agent,
316 struct ib_mad_recv_wc *mad_recv_wc)
317 {
318 struct mad_rmpp_recv *rmpp_recv;
319 struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
320
321 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
322 if (rmpp_recv->tid == mad_hdr->tid &&
323 rmpp_recv->src_qp == mad_recv_wc->wc->src_qp &&
324 rmpp_recv->slid == mad_recv_wc->wc->slid &&
325 rmpp_recv->mgmt_class == mad_hdr->mgmt_class &&
326 rmpp_recv->class_version == mad_hdr->class_version &&
327 rmpp_recv->method == mad_hdr->method)
328 return rmpp_recv;
329 }
330 return NULL;
331 }
332
333 static struct mad_rmpp_recv *
334 acquire_rmpp_recv(struct ib_mad_agent_private *agent,
335 struct ib_mad_recv_wc *mad_recv_wc)
336 {
337 struct mad_rmpp_recv *rmpp_recv;
338 unsigned long flags;
339
340 spin_lock_irqsave(&agent->lock, flags);
341 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
342 if (rmpp_recv)
343 atomic_inc(&rmpp_recv->refcount);
344 spin_unlock_irqrestore(&agent->lock, flags);
345 return rmpp_recv;
346 }
347
348 static struct mad_rmpp_recv *
349 insert_rmpp_recv(struct ib_mad_agent_private *agent,
350 struct mad_rmpp_recv *rmpp_recv)
351 {
352 struct mad_rmpp_recv *cur_rmpp_recv;
353
354 cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc);
355 if (!cur_rmpp_recv)
356 list_add_tail(&rmpp_recv->list, &agent->rmpp_list);
357
358 return cur_rmpp_recv;
359 }
360
361 static inline int get_last_flag(struct ib_mad_recv_buf *seg)
362 {
363 struct ib_rmpp_mad *rmpp_mad;
364
365 rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
366 return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST;
367 }
368
369 static inline int get_seg_num(struct ib_mad_recv_buf *seg)
370 {
371 struct ib_rmpp_mad *rmpp_mad;
372
373 rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
374 return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
375 }
376
377 static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list,
378 struct ib_mad_recv_buf *seg)
379 {
380 if (seg->list.next == rmpp_list)
381 return NULL;
382
383 return container_of(seg->list.next, struct ib_mad_recv_buf, list);
384 }
385
386 static inline int window_size(struct ib_mad_agent_private *agent)
387 {
388 return max(agent->qp_info->recv_queue.max_active >> 3, 1);
389 }
390
391 static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list,
392 int seg_num)
393 {
394 struct ib_mad_recv_buf *seg_buf;
395 int cur_seg_num;
396
397 list_for_each_entry_reverse(seg_buf, rmpp_list, list) {
398 cur_seg_num = get_seg_num(seg_buf);
399 if (seg_num > cur_seg_num)
400 return seg_buf;
401 if (seg_num == cur_seg_num)
402 break;
403 }
404 return NULL;
405 }
406
407 static void update_seg_num(struct mad_rmpp_recv *rmpp_recv,
408 struct ib_mad_recv_buf *new_buf)
409 {
410 struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list;
411
412 while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) {
413 rmpp_recv->cur_seg_buf = new_buf;
414 rmpp_recv->seg_num++;
415 new_buf = get_next_seg(rmpp_list, new_buf);
416 }
417 }
418
419 static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv)
420 {
421 struct ib_rmpp_mad *rmpp_mad;
422 int hdr_size, data_size, pad;
423
424 rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad;
425
426 hdr_size = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
427 data_size = sizeof(struct ib_rmpp_mad) - hdr_size;
428 pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
429 if (pad > IB_MGMT_RMPP_DATA || pad < 0)
430 pad = 0;
431
432 return hdr_size + rmpp_recv->seg_num * data_size - pad;
433 }
434
435 static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv)
436 {
437 struct ib_mad_recv_wc *rmpp_wc;
438
439 ack_recv(rmpp_recv, rmpp_recv->rmpp_wc);
440 if (rmpp_recv->seg_num > 1)
441 cancel_delayed_work(&rmpp_recv->timeout_work);
442
443 rmpp_wc = rmpp_recv->rmpp_wc;
444 rmpp_wc->mad_len = get_mad_len(rmpp_recv);
445 /* 10 seconds until we can find the packet lifetime */
446 queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq,
447 &rmpp_recv->cleanup_work, msecs_to_jiffies(10000));
448 return rmpp_wc;
449 }
450
451 static struct ib_mad_recv_wc *
452 continue_rmpp(struct ib_mad_agent_private *agent,
453 struct ib_mad_recv_wc *mad_recv_wc)
454 {
455 struct mad_rmpp_recv *rmpp_recv;
456 struct ib_mad_recv_buf *prev_buf;
457 struct ib_mad_recv_wc *done_wc;
458 int seg_num;
459 unsigned long flags;
460
461 rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc);
462 if (!rmpp_recv)
463 goto drop1;
464
465 seg_num = get_seg_num(&mad_recv_wc->recv_buf);
466
467 spin_lock_irqsave(&rmpp_recv->lock, flags);
468 if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) ||
469 (seg_num > rmpp_recv->newwin))
470 goto drop3;
471
472 if ((seg_num <= rmpp_recv->last_ack) ||
473 (rmpp_recv->state == RMPP_STATE_COMPLETE)) {
474 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
475 ack_recv(rmpp_recv, mad_recv_wc);
476 goto drop2;
477 }
478
479 prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num);
480 if (!prev_buf)
481 goto drop3;
482
483 done_wc = NULL;
484 list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list);
485 if (rmpp_recv->cur_seg_buf == prev_buf) {
486 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf);
487 if (get_last_flag(rmpp_recv->cur_seg_buf)) {
488 rmpp_recv->state = RMPP_STATE_COMPLETE;
489 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
490 done_wc = complete_rmpp(rmpp_recv);
491 goto out;
492 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) {
493 rmpp_recv->newwin += window_size(agent);
494 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
495 ack_recv(rmpp_recv, mad_recv_wc);
496 goto out;
497 }
498 }
499 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
500 out:
501 deref_rmpp_recv(rmpp_recv);
502 return done_wc;
503
504 drop3: spin_unlock_irqrestore(&rmpp_recv->lock, flags);
505 drop2: deref_rmpp_recv(rmpp_recv);
506 drop1: ib_free_recv_mad(mad_recv_wc);
507 return NULL;
508 }
509
510 static struct ib_mad_recv_wc *
511 start_rmpp(struct ib_mad_agent_private *agent,
512 struct ib_mad_recv_wc *mad_recv_wc)
513 {
514 struct mad_rmpp_recv *rmpp_recv;
515 unsigned long flags;
516
517 rmpp_recv = create_rmpp_recv(agent, mad_recv_wc);
518 if (!rmpp_recv) {
519 ib_free_recv_mad(mad_recv_wc);
520 return NULL;
521 }
522
523 spin_lock_irqsave(&agent->lock, flags);
524 if (insert_rmpp_recv(agent, rmpp_recv)) {
525 spin_unlock_irqrestore(&agent->lock, flags);
526 /* duplicate first MAD */
527 destroy_rmpp_recv(rmpp_recv);
528 return continue_rmpp(agent, mad_recv_wc);
529 }
530 atomic_inc(&rmpp_recv->refcount);
531
532 if (get_last_flag(&mad_recv_wc->recv_buf)) {
533 rmpp_recv->state = RMPP_STATE_COMPLETE;
534 spin_unlock_irqrestore(&agent->lock, flags);
535 complete_rmpp(rmpp_recv);
536 } else {
537 spin_unlock_irqrestore(&agent->lock, flags);
538 /* 40 seconds until we can find the packet lifetimes */
539 queue_delayed_work(agent->qp_info->port_priv->wq,
540 &rmpp_recv->timeout_work,
541 msecs_to_jiffies(40000));
542 rmpp_recv->newwin += window_size(agent);
543 ack_recv(rmpp_recv, mad_recv_wc);
544 mad_recv_wc = NULL;
545 }
546 deref_rmpp_recv(rmpp_recv);
547 return mad_recv_wc;
548 }
549
550 static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr)
551 {
552 struct ib_rmpp_mad *rmpp_mad;
553 int timeout;
554 u32 paylen = 0;
555
556 rmpp_mad = mad_send_wr->send_buf.mad;
557 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
558 rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num);
559
560 if (mad_send_wr->seg_num == 1) {
561 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST;
562 paylen = mad_send_wr->send_buf.seg_count * IB_MGMT_RMPP_DATA -
563 mad_send_wr->pad;
564 }
565
566 if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) {
567 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST;
568 paylen = IB_MGMT_RMPP_DATA - mad_send_wr->pad;
569 }
570 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
571
572 /* 2 seconds for an ACK until we can find the packet lifetime */
573 timeout = mad_send_wr->send_buf.timeout_ms;
574 if (!timeout || timeout > 2000)
575 mad_send_wr->timeout = msecs_to_jiffies(2000);
576
577 return ib_send_mad(mad_send_wr);
578 }
579
580 static void abort_send(struct ib_mad_agent_private *agent,
581 struct ib_mad_recv_wc *mad_recv_wc, u8 rmpp_status)
582 {
583 struct ib_mad_send_wr_private *mad_send_wr;
584 struct ib_mad_send_wc wc;
585 unsigned long flags;
586
587 spin_lock_irqsave(&agent->lock, flags);
588 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
589 if (!mad_send_wr)
590 goto out; /* Unmatched send */
591
592 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
593 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
594 goto out; /* Send is already done */
595
596 ib_mark_mad_done(mad_send_wr);
597 spin_unlock_irqrestore(&agent->lock, flags);
598
599 wc.status = IB_WC_REM_ABORT_ERR;
600 wc.vendor_err = rmpp_status;
601 wc.send_buf = &mad_send_wr->send_buf;
602 ib_mad_complete_send_wr(mad_send_wr, &wc);
603 return;
604 out:
605 spin_unlock_irqrestore(&agent->lock, flags);
606 }
607
608 static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr,
609 int seg_num)
610 {
611 struct list_head *list;
612
613 wr->last_ack = seg_num;
614 list = &wr->last_ack_seg->list;
615 list_for_each_entry(wr->last_ack_seg, list, list)
616 if (wr->last_ack_seg->num == seg_num)
617 break;
618 }
619
620 static void process_ds_ack(struct ib_mad_agent_private *agent,
621 struct ib_mad_recv_wc *mad_recv_wc, int newwin)
622 {
623 struct mad_rmpp_recv *rmpp_recv;
624
625 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
626 if (rmpp_recv && rmpp_recv->state == RMPP_STATE_COMPLETE)
627 rmpp_recv->repwin = newwin;
628 }
629
630 static void process_rmpp_ack(struct ib_mad_agent_private *agent,
631 struct ib_mad_recv_wc *mad_recv_wc)
632 {
633 struct ib_mad_send_wr_private *mad_send_wr;
634 struct ib_rmpp_mad *rmpp_mad;
635 unsigned long flags;
636 int seg_num, newwin, ret;
637
638 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
639 if (rmpp_mad->rmpp_hdr.rmpp_status) {
640 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
641 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
642 return;
643 }
644
645 seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
646 newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
647 if (newwin < seg_num) {
648 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
649 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
650 return;
651 }
652
653 spin_lock_irqsave(&agent->lock, flags);
654 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
655 if (!mad_send_wr) {
656 if (!seg_num)
657 process_ds_ack(agent, mad_recv_wc, newwin);
658 goto out; /* Unmatched or DS RMPP ACK */
659 }
660
661 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) &&
662 (mad_send_wr->timeout)) {
663 spin_unlock_irqrestore(&agent->lock, flags);
664 ack_ds_ack(agent, mad_recv_wc);
665 return; /* Repeated ACK for DS RMPP transaction */
666 }
667
668 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
669 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
670 goto out; /* Send is already done */
671
672 if (seg_num > mad_send_wr->send_buf.seg_count ||
673 seg_num > mad_send_wr->newwin) {
674 spin_unlock_irqrestore(&agent->lock, flags);
675 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
676 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
677 return;
678 }
679
680 if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack)
681 goto out; /* Old ACK */
682
683 if (seg_num > mad_send_wr->last_ack) {
684 adjust_last_ack(mad_send_wr, seg_num);
685 mad_send_wr->retries_left = mad_send_wr->max_retries;
686 }
687 mad_send_wr->newwin = newwin;
688 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
689 /* If no response is expected, the ACK completes the send */
690 if (!mad_send_wr->send_buf.timeout_ms) {
691 struct ib_mad_send_wc wc;
692
693 ib_mark_mad_done(mad_send_wr);
694 spin_unlock_irqrestore(&agent->lock, flags);
695
696 wc.status = IB_WC_SUCCESS;
697 wc.vendor_err = 0;
698 wc.send_buf = &mad_send_wr->send_buf;
699 ib_mad_complete_send_wr(mad_send_wr, &wc);
700 return;
701 }
702 if (mad_send_wr->refcount == 1)
703 ib_reset_mad_timeout(mad_send_wr,
704 mad_send_wr->send_buf.timeout_ms);
705 spin_unlock_irqrestore(&agent->lock, flags);
706 ack_ds_ack(agent, mad_recv_wc);
707 return;
708 } else if (mad_send_wr->refcount == 1 &&
709 mad_send_wr->seg_num < mad_send_wr->newwin &&
710 mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) {
711 /* Send failure will just result in a timeout/retry */
712 ret = send_next_seg(mad_send_wr);
713 if (ret)
714 goto out;
715
716 mad_send_wr->refcount++;
717 list_move_tail(&mad_send_wr->agent_list,
718 &mad_send_wr->mad_agent_priv->send_list);
719 }
720 out:
721 spin_unlock_irqrestore(&agent->lock, flags);
722 }
723
724 static struct ib_mad_recv_wc *
725 process_rmpp_data(struct ib_mad_agent_private *agent,
726 struct ib_mad_recv_wc *mad_recv_wc)
727 {
728 struct ib_rmpp_hdr *rmpp_hdr;
729 u8 rmpp_status;
730
731 rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr;
732
733 if (rmpp_hdr->rmpp_status) {
734 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS;
735 goto bad;
736 }
737
738 if (rmpp_hdr->seg_num == __constant_htonl(1)) {
739 if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) {
740 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
741 goto bad;
742 }
743 return start_rmpp(agent, mad_recv_wc);
744 } else {
745 if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) {
746 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
747 goto bad;
748 }
749 return continue_rmpp(agent, mad_recv_wc);
750 }
751 bad:
752 nack_recv(agent, mad_recv_wc, rmpp_status);
753 ib_free_recv_mad(mad_recv_wc);
754 return NULL;
755 }
756
757 static void process_rmpp_stop(struct ib_mad_agent_private *agent,
758 struct ib_mad_recv_wc *mad_recv_wc)
759 {
760 struct ib_rmpp_mad *rmpp_mad;
761
762 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
763
764 if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) {
765 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
766 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
767 } else
768 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
769 }
770
771 static void process_rmpp_abort(struct ib_mad_agent_private *agent,
772 struct ib_mad_recv_wc *mad_recv_wc)
773 {
774 struct ib_rmpp_mad *rmpp_mad;
775
776 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
777
778 if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN ||
779 rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) {
780 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
781 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
782 } else
783 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
784 }
785
786 struct ib_mad_recv_wc *
787 ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent,
788 struct ib_mad_recv_wc *mad_recv_wc)
789 {
790 struct ib_rmpp_mad *rmpp_mad;
791
792 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
793 if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE))
794 return mad_recv_wc;
795
796 if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) {
797 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
798 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
799 goto out;
800 }
801
802 switch (rmpp_mad->rmpp_hdr.rmpp_type) {
803 case IB_MGMT_RMPP_TYPE_DATA:
804 return process_rmpp_data(agent, mad_recv_wc);
805 case IB_MGMT_RMPP_TYPE_ACK:
806 process_rmpp_ack(agent, mad_recv_wc);
807 break;
808 case IB_MGMT_RMPP_TYPE_STOP:
809 process_rmpp_stop(agent, mad_recv_wc);
810 break;
811 case IB_MGMT_RMPP_TYPE_ABORT:
812 process_rmpp_abort(agent, mad_recv_wc);
813 break;
814 default:
815 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
816 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
817 break;
818 }
819 out:
820 ib_free_recv_mad(mad_recv_wc);
821 return NULL;
822 }
823
824 static int init_newwin(struct ib_mad_send_wr_private *mad_send_wr)
825 {
826 struct ib_mad_agent_private *agent = mad_send_wr->mad_agent_priv;
827 struct ib_mad_hdr *mad_hdr = mad_send_wr->send_buf.mad;
828 struct mad_rmpp_recv *rmpp_recv;
829 struct ib_ah_attr ah_attr;
830 unsigned long flags;
831 int newwin = 1;
832
833 if (!(mad_hdr->method & IB_MGMT_METHOD_RESP))
834 goto out;
835
836 spin_lock_irqsave(&agent->lock, flags);
837 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
838 if (rmpp_recv->tid != mad_hdr->tid ||
839 rmpp_recv->mgmt_class != mad_hdr->mgmt_class ||
840 rmpp_recv->class_version != mad_hdr->class_version ||
841 (rmpp_recv->method & IB_MGMT_METHOD_RESP))
842 continue;
843
844 if (ib_query_ah(mad_send_wr->send_buf.ah, &ah_attr))
845 continue;
846
847 if (rmpp_recv->slid == ah_attr.dlid) {
848 newwin = rmpp_recv->repwin;
849 break;
850 }
851 }
852 spin_unlock_irqrestore(&agent->lock, flags);
853 out:
854 return newwin;
855 }
856
857 int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
858 {
859 struct ib_rmpp_mad *rmpp_mad;
860 int ret;
861
862 rmpp_mad = mad_send_wr->send_buf.mad;
863 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
864 IB_MGMT_RMPP_FLAG_ACTIVE))
865 return IB_RMPP_RESULT_UNHANDLED;
866
867 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) {
868 mad_send_wr->seg_num = 1;
869 return IB_RMPP_RESULT_INTERNAL;
870 }
871
872 mad_send_wr->newwin = init_newwin(mad_send_wr);
873
874 /* We need to wait for the final ACK even if there isn't a response */
875 mad_send_wr->refcount += (mad_send_wr->timeout == 0);
876 ret = send_next_seg(mad_send_wr);
877 if (!ret)
878 return IB_RMPP_RESULT_CONSUMED;
879 return ret;
880 }
881
882 int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr,
883 struct ib_mad_send_wc *mad_send_wc)
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; /* RMPP not active */
892
893 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
894 return IB_RMPP_RESULT_INTERNAL; /* ACK, STOP, or ABORT */
895
896 if (mad_send_wc->status != IB_WC_SUCCESS ||
897 mad_send_wr->status != IB_WC_SUCCESS)
898 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */
899
900 if (!mad_send_wr->timeout)
901 return IB_RMPP_RESULT_PROCESSED; /* Response received */
902
903 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
904 mad_send_wr->timeout =
905 msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
906 return IB_RMPP_RESULT_PROCESSED; /* Send done */
907 }
908
909 if (mad_send_wr->seg_num == mad_send_wr->newwin ||
910 mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count)
911 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */
912
913 ret = send_next_seg(mad_send_wr);
914 if (ret) {
915 mad_send_wc->status = IB_WC_GENERAL_ERR;
916 return IB_RMPP_RESULT_PROCESSED;
917 }
918 return IB_RMPP_RESULT_CONSUMED;
919 }
920
921 int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr)
922 {
923 struct ib_rmpp_mad *rmpp_mad;
924 int ret;
925
926 rmpp_mad = mad_send_wr->send_buf.mad;
927 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
928 IB_MGMT_RMPP_FLAG_ACTIVE))
929 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
930
931 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count)
932 return IB_RMPP_RESULT_PROCESSED;
933
934 mad_send_wr->seg_num = mad_send_wr->last_ack;
935 mad_send_wr->cur_seg = mad_send_wr->last_ack_seg;
936
937 ret = send_next_seg(mad_send_wr);
938 if (ret)
939 return IB_RMPP_RESULT_PROCESSED;
940
941 return IB_RMPP_RESULT_CONSUMED;
942 }
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