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Revert "[PATCH] paravirt: Add startup infrastructure for paravirtualization"
[pv_ops_mirror.git] / drivers / infiniband / core / mad_rmpp.c
blob3663fd7022be6764d60d19ff7a19039931802723
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 * $Id: mad_rmpp.c 1921 2005-03-02 22:58:44Z sean.hefty $
34 */
35
36 #include "mad_priv.h"
37 #include "mad_rmpp.h"
38
39 enum rmpp_state {
40 RMPP_STATE_ACTIVE,
41 RMPP_STATE_TIMEOUT,
42 RMPP_STATE_COMPLETE
43 };
44
45 struct mad_rmpp_recv {
46 struct ib_mad_agent_private *agent;
47 struct list_head list;
48 struct delayed_work timeout_work;
49 struct delayed_work cleanup_work;
50 struct completion comp;
51 enum rmpp_state state;
52 spinlock_t lock;
53 atomic_t refcount;
54
55 struct ib_ah *ah;
56 struct ib_mad_recv_wc *rmpp_wc;
57 struct ib_mad_recv_buf *cur_seg_buf;
58 int last_ack;
59 int seg_num;
60 int newwin;
61 int repwin;
62
63 __be64 tid;
64 u32 src_qp;
65 u16 slid;
66 u8 mgmt_class;
67 u8 class_version;
68 u8 method;
69 };
70
71 static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
72 {
73 if (atomic_dec_and_test(&rmpp_recv->refcount))
74 complete(&rmpp_recv->comp);
75 }
76
77 static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
78 {
79 deref_rmpp_recv(rmpp_recv);
80 wait_for_completion(&rmpp_recv->comp);
81 ib_destroy_ah(rmpp_recv->ah);
82 kfree(rmpp_recv);
83 }
84
85 void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent)
86 {
87 struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv;
88 unsigned long flags;
89
90 spin_lock_irqsave(&agent->lock, flags);
91 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
92 cancel_delayed_work(&rmpp_recv->timeout_work);
93 cancel_delayed_work(&rmpp_recv->cleanup_work);
94 }
95 spin_unlock_irqrestore(&agent->lock, flags);
96
97 flush_workqueue(agent->qp_info->port_priv->wq);
98
99 list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv,
100 &agent->rmpp_list, list) {
101 list_del(&rmpp_recv->list);
102 if (rmpp_recv->state != RMPP_STATE_COMPLETE)
103 ib_free_recv_mad(rmpp_recv->rmpp_wc);
104 destroy_rmpp_recv(rmpp_recv);
105 }
106 }
107
108 static void format_ack(struct ib_mad_send_buf *msg,
109 struct ib_rmpp_mad *data,
110 struct mad_rmpp_recv *rmpp_recv)
111 {
112 struct ib_rmpp_mad *ack = msg->mad;
113 unsigned long flags;
114
115 memcpy(ack, &data->mad_hdr, msg->hdr_len);
116
117 ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
118 ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK;
119 ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
120
121 spin_lock_irqsave(&rmpp_recv->lock, flags);
122 rmpp_recv->last_ack = rmpp_recv->seg_num;
123 ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num);
124 ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin);
125 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
126 }
127
128 static void ack_recv(struct mad_rmpp_recv *rmpp_recv,
129 struct ib_mad_recv_wc *recv_wc)
130 {
131 struct ib_mad_send_buf *msg;
132 int ret, hdr_len;
133
134 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
135 msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp,
136 recv_wc->wc->pkey_index, 1, hdr_len,
137 0, GFP_KERNEL);
138 if (!msg)
139 return;
140
141 format_ack(msg, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv);
142 msg->ah = rmpp_recv->ah;
143 ret = ib_post_send_mad(msg, NULL);
144 if (ret)
145 ib_free_send_mad(msg);
146 }
147
148 static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent,
149 struct ib_mad_recv_wc *recv_wc)
150 {
151 struct ib_mad_send_buf *msg;
152 struct ib_ah *ah;
153 int hdr_len;
154
155 ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc,
156 recv_wc->recv_buf.grh, agent->port_num);
157 if (IS_ERR(ah))
158 return (void *) ah;
159
160 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
161 msg = ib_create_send_mad(agent, recv_wc->wc->src_qp,
162 recv_wc->wc->pkey_index, 1,
163 hdr_len, 0, GFP_KERNEL);
164 if (IS_ERR(msg))
165 ib_destroy_ah(ah);
166 else
167 msg->ah = ah;
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 struct ib_rmpp_mad *rmpp_mad = mad_send_wc->send_buf->mad;
201
202 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_ACK)
203 ib_destroy_ah(mad_send_wc->send_buf->ah);
204 ib_free_send_mad(mad_send_wc->send_buf);
205 }
206
207 static void nack_recv(struct ib_mad_agent_private *agent,
208 struct ib_mad_recv_wc *recv_wc, u8 rmpp_status)
209 {
210 struct ib_mad_send_buf *msg;
211 struct ib_rmpp_mad *rmpp_mad;
212 int ret;
213
214 msg = alloc_response_msg(&agent->agent, recv_wc);
215 if (IS_ERR(msg))
216 return;
217
218 rmpp_mad = msg->mad;
219 memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
220
221 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
222 rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION;
223 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ABORT;
224 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
225 rmpp_mad->rmpp_hdr.rmpp_status = rmpp_status;
226 rmpp_mad->rmpp_hdr.seg_num = 0;
227 rmpp_mad->rmpp_hdr.paylen_newwin = 0;
228
229 ret = ib_post_send_mad(msg, NULL);
230 if (ret) {
231 ib_destroy_ah(msg->ah);
232 ib_free_send_mad(msg);
233 }
234 }
235
236 static void recv_timeout_handler(struct work_struct *work)
237 {
238 struct mad_rmpp_recv *rmpp_recv =
239 container_of(work, struct mad_rmpp_recv, timeout_work.work);
240 struct ib_mad_recv_wc *rmpp_wc;
241 unsigned long flags;
242
243 spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
244 if (rmpp_recv->state != RMPP_STATE_ACTIVE) {
245 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
246 return;
247 }
248 rmpp_recv->state = RMPP_STATE_TIMEOUT;
249 list_del(&rmpp_recv->list);
250 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
251
252 rmpp_wc = rmpp_recv->rmpp_wc;
253 nack_recv(rmpp_recv->agent, rmpp_wc, IB_MGMT_RMPP_STATUS_T2L);
254 destroy_rmpp_recv(rmpp_recv);
255 ib_free_recv_mad(rmpp_wc);
256 }
257
258 static void recv_cleanup_handler(struct work_struct *work)
259 {
260 struct mad_rmpp_recv *rmpp_recv =
261 container_of(work, struct mad_rmpp_recv, cleanup_work.work);
262 unsigned long flags;
263
264 spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
265 list_del(&rmpp_recv->list);
266 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
267 destroy_rmpp_recv(rmpp_recv);
268 }
269
270 static struct mad_rmpp_recv *
271 create_rmpp_recv(struct ib_mad_agent_private *agent,
272 struct ib_mad_recv_wc *mad_recv_wc)
273 {
274 struct mad_rmpp_recv *rmpp_recv;
275 struct ib_mad_hdr *mad_hdr;
276
277 rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL);
278 if (!rmpp_recv)
279 return NULL;
280
281 rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd,
282 mad_recv_wc->wc,
283 mad_recv_wc->recv_buf.grh,
284 agent->agent.port_num);
285 if (IS_ERR(rmpp_recv->ah))
286 goto error;
287
288 rmpp_recv->agent = agent;
289 init_completion(&rmpp_recv->comp);
290 INIT_DELAYED_WORK(&rmpp_recv->timeout_work, recv_timeout_handler);
291 INIT_DELAYED_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler);
292 spin_lock_init(&rmpp_recv->lock);
293 rmpp_recv->state = RMPP_STATE_ACTIVE;
294 atomic_set(&rmpp_recv->refcount, 1);
295
296 rmpp_recv->rmpp_wc = mad_recv_wc;
297 rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf;
298 rmpp_recv->newwin = 1;
299 rmpp_recv->seg_num = 1;
300 rmpp_recv->last_ack = 0;
301 rmpp_recv->repwin = 1;
302
303 mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
304 rmpp_recv->tid = mad_hdr->tid;
305 rmpp_recv->src_qp = mad_recv_wc->wc->src_qp;
306 rmpp_recv->slid = mad_recv_wc->wc->slid;
307 rmpp_recv->mgmt_class = mad_hdr->mgmt_class;
308 rmpp_recv->class_version = mad_hdr->class_version;
309 rmpp_recv->method = mad_hdr->method;
310 return rmpp_recv;
311
312 error: kfree(rmpp_recv);
313 return NULL;
314 }
315
316 static struct mad_rmpp_recv *
317 find_rmpp_recv(struct ib_mad_agent_private *agent,
318 struct ib_mad_recv_wc *mad_recv_wc)
319 {
320 struct mad_rmpp_recv *rmpp_recv;
321 struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
322
323 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
324 if (rmpp_recv->tid == mad_hdr->tid &&
325 rmpp_recv->src_qp == mad_recv_wc->wc->src_qp &&
326 rmpp_recv->slid == mad_recv_wc->wc->slid &&
327 rmpp_recv->mgmt_class == mad_hdr->mgmt_class &&
328 rmpp_recv->class_version == mad_hdr->class_version &&
329 rmpp_recv->method == mad_hdr->method)
330 return rmpp_recv;
331 }
332 return NULL;
333 }
334
335 static struct mad_rmpp_recv *
336 acquire_rmpp_recv(struct ib_mad_agent_private *agent,
337 struct ib_mad_recv_wc *mad_recv_wc)
338 {
339 struct mad_rmpp_recv *rmpp_recv;
340 unsigned long flags;
341
342 spin_lock_irqsave(&agent->lock, flags);
343 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
344 if (rmpp_recv)
345 atomic_inc(&rmpp_recv->refcount);
346 spin_unlock_irqrestore(&agent->lock, flags);
347 return rmpp_recv;
348 }
349
350 static struct mad_rmpp_recv *
351 insert_rmpp_recv(struct ib_mad_agent_private *agent,
352 struct mad_rmpp_recv *rmpp_recv)
353 {
354 struct mad_rmpp_recv *cur_rmpp_recv;
355
356 cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc);
357 if (!cur_rmpp_recv)
358 list_add_tail(&rmpp_recv->list, &agent->rmpp_list);
359
360 return cur_rmpp_recv;
361 }
362
363 static inline int get_last_flag(struct ib_mad_recv_buf *seg)
364 {
365 struct ib_rmpp_mad *rmpp_mad;
366
367 rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
368 return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST;
369 }
370
371 static inline int get_seg_num(struct ib_mad_recv_buf *seg)
372 {
373 struct ib_rmpp_mad *rmpp_mad;
374
375 rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
376 return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
377 }
378
379 static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list,
380 struct ib_mad_recv_buf *seg)
381 {
382 if (seg->list.next == rmpp_list)
383 return NULL;
384
385 return container_of(seg->list.next, struct ib_mad_recv_buf, list);
386 }
387
388 static inline int window_size(struct ib_mad_agent_private *agent)
389 {
390 return max(agent->qp_info->recv_queue.max_active >> 3, 1);
391 }
392
393 static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list,
394 int seg_num)
395 {
396 struct ib_mad_recv_buf *seg_buf;
397 int cur_seg_num;
398
399 list_for_each_entry_reverse(seg_buf, rmpp_list, list) {
400 cur_seg_num = get_seg_num(seg_buf);
401 if (seg_num > cur_seg_num)
402 return seg_buf;
403 if (seg_num == cur_seg_num)
404 break;
405 }
406 return NULL;
407 }
408
409 static void update_seg_num(struct mad_rmpp_recv *rmpp_recv,
410 struct ib_mad_recv_buf *new_buf)
411 {
412 struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list;
413
414 while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) {
415 rmpp_recv->cur_seg_buf = new_buf;
416 rmpp_recv->seg_num++;
417 new_buf = get_next_seg(rmpp_list, new_buf);
418 }
419 }
420
421 static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv)
422 {
423 struct ib_rmpp_mad *rmpp_mad;
424 int hdr_size, data_size, pad;
425
426 rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad;
427
428 hdr_size = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
429 data_size = sizeof(struct ib_rmpp_mad) - hdr_size;
430 pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
431 if (pad > IB_MGMT_RMPP_DATA || pad < 0)
432 pad = 0;
433
434 return hdr_size + rmpp_recv->seg_num * data_size - pad;
435 }
436
437 static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv)
438 {
439 struct ib_mad_recv_wc *rmpp_wc;
440
441 ack_recv(rmpp_recv, rmpp_recv->rmpp_wc);
442 if (rmpp_recv->seg_num > 1)
443 cancel_delayed_work(&rmpp_recv->timeout_work);
444
445 rmpp_wc = rmpp_recv->rmpp_wc;
446 rmpp_wc->mad_len = get_mad_len(rmpp_recv);
447 /* 10 seconds until we can find the packet lifetime */
448 queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq,
449 &rmpp_recv->cleanup_work, msecs_to_jiffies(10000));
450 return rmpp_wc;
451 }
452
453 static struct ib_mad_recv_wc *
454 continue_rmpp(struct ib_mad_agent_private *agent,
455 struct ib_mad_recv_wc *mad_recv_wc)
456 {
457 struct mad_rmpp_recv *rmpp_recv;
458 struct ib_mad_recv_buf *prev_buf;
459 struct ib_mad_recv_wc *done_wc;
460 int seg_num;
461 unsigned long flags;
462
463 rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc);
464 if (!rmpp_recv)
465 goto drop1;
466
467 seg_num = get_seg_num(&mad_recv_wc->recv_buf);
468
469 spin_lock_irqsave(&rmpp_recv->lock, flags);
470 if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) ||
471 (seg_num > rmpp_recv->newwin))
472 goto drop3;
473
474 if ((seg_num <= rmpp_recv->last_ack) ||
475 (rmpp_recv->state == RMPP_STATE_COMPLETE)) {
476 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
477 ack_recv(rmpp_recv, mad_recv_wc);
478 goto drop2;
479 }
480
481 prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num);
482 if (!prev_buf)
483 goto drop3;
484
485 done_wc = NULL;
486 list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list);
487 if (rmpp_recv->cur_seg_buf == prev_buf) {
488 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf);
489 if (get_last_flag(rmpp_recv->cur_seg_buf)) {
490 rmpp_recv->state = RMPP_STATE_COMPLETE;
491 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
492 done_wc = complete_rmpp(rmpp_recv);
493 goto out;
494 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) {
495 rmpp_recv->newwin += window_size(agent);
496 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
497 ack_recv(rmpp_recv, mad_recv_wc);
498 goto out;
499 }
500 }
501 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
502 out:
503 deref_rmpp_recv(rmpp_recv);
504 return done_wc;
505
506 drop3: spin_unlock_irqrestore(&rmpp_recv->lock, flags);
507 drop2: deref_rmpp_recv(rmpp_recv);
508 drop1: ib_free_recv_mad(mad_recv_wc);
509 return NULL;
510 }
511
512 static struct ib_mad_recv_wc *
513 start_rmpp(struct ib_mad_agent_private *agent,
514 struct ib_mad_recv_wc *mad_recv_wc)
515 {
516 struct mad_rmpp_recv *rmpp_recv;
517 unsigned long flags;
518
519 rmpp_recv = create_rmpp_recv(agent, mad_recv_wc);
520 if (!rmpp_recv) {
521 ib_free_recv_mad(mad_recv_wc);
522 return NULL;
523 }
524
525 spin_lock_irqsave(&agent->lock, flags);
526 if (insert_rmpp_recv(agent, rmpp_recv)) {
527 spin_unlock_irqrestore(&agent->lock, flags);
528 /* duplicate first MAD */
529 destroy_rmpp_recv(rmpp_recv);
530 return continue_rmpp(agent, mad_recv_wc);
531 }
532 atomic_inc(&rmpp_recv->refcount);
533
534 if (get_last_flag(&mad_recv_wc->recv_buf)) {
535 rmpp_recv->state = RMPP_STATE_COMPLETE;
536 spin_unlock_irqrestore(&agent->lock, flags);
537 complete_rmpp(rmpp_recv);
538 } else {
539 spin_unlock_irqrestore(&agent->lock, flags);
540 /* 40 seconds until we can find the packet lifetimes */
541 queue_delayed_work(agent->qp_info->port_priv->wq,
542 &rmpp_recv->timeout_work,
543 msecs_to_jiffies(40000));
544 rmpp_recv->newwin += window_size(agent);
545 ack_recv(rmpp_recv, mad_recv_wc);
546 mad_recv_wc = NULL;
547 }
548 deref_rmpp_recv(rmpp_recv);
549 return mad_recv_wc;
550 }
551
552 static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr)
553 {
554 struct ib_rmpp_mad *rmpp_mad;
555 int timeout;
556 u32 paylen = 0;
557
558 rmpp_mad = mad_send_wr->send_buf.mad;
559 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
560 rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num);
561
562 if (mad_send_wr->seg_num == 1) {
563 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST;
564 paylen = mad_send_wr->send_buf.seg_count * IB_MGMT_RMPP_DATA -
565 mad_send_wr->pad;
566 }
567
568 if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) {
569 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST;
570 paylen = IB_MGMT_RMPP_DATA - mad_send_wr->pad;
571 }
572 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
573
574 /* 2 seconds for an ACK until we can find the packet lifetime */
575 timeout = mad_send_wr->send_buf.timeout_ms;
576 if (!timeout || timeout > 2000)
577 mad_send_wr->timeout = msecs_to_jiffies(2000);
578
579 return ib_send_mad(mad_send_wr);
580 }
581
582 static void abort_send(struct ib_mad_agent_private *agent,
583 struct ib_mad_recv_wc *mad_recv_wc, u8 rmpp_status)
584 {
585 struct ib_mad_send_wr_private *mad_send_wr;
586 struct ib_mad_send_wc wc;
587 unsigned long flags;
588
589 spin_lock_irqsave(&agent->lock, flags);
590 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
591 if (!mad_send_wr)
592 goto out; /* Unmatched send */
593
594 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
595 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
596 goto out; /* Send is already done */
597
598 ib_mark_mad_done(mad_send_wr);
599 spin_unlock_irqrestore(&agent->lock, flags);
600
601 wc.status = IB_WC_REM_ABORT_ERR;
602 wc.vendor_err = rmpp_status;
603 wc.send_buf = &mad_send_wr->send_buf;
604 ib_mad_complete_send_wr(mad_send_wr, &wc);
605 return;
606 out:
607 spin_unlock_irqrestore(&agent->lock, flags);
608 }
609
610 static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr,
611 int seg_num)
612 {
613 struct list_head *list;
614
615 wr->last_ack = seg_num;
616 list = &wr->last_ack_seg->list;
617 list_for_each_entry(wr->last_ack_seg, list, list)
618 if (wr->last_ack_seg->num == seg_num)
619 break;
620 }
621
622 static void process_ds_ack(struct ib_mad_agent_private *agent,
623 struct ib_mad_recv_wc *mad_recv_wc, int newwin)
624 {
625 struct mad_rmpp_recv *rmpp_recv;
626
627 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
628 if (rmpp_recv && rmpp_recv->state == RMPP_STATE_COMPLETE)
629 rmpp_recv->repwin = newwin;
630 }
631
632 static void process_rmpp_ack(struct ib_mad_agent_private *agent,
633 struct ib_mad_recv_wc *mad_recv_wc)
634 {
635 struct ib_mad_send_wr_private *mad_send_wr;
636 struct ib_rmpp_mad *rmpp_mad;
637 unsigned long flags;
638 int seg_num, newwin, ret;
639
640 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
641 if (rmpp_mad->rmpp_hdr.rmpp_status) {
642 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
643 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
644 return;
645 }
646
647 seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
648 newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
649 if (newwin < seg_num) {
650 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
651 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
652 return;
653 }
654
655 spin_lock_irqsave(&agent->lock, flags);
656 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
657 if (!mad_send_wr) {
658 if (!seg_num)
659 process_ds_ack(agent, mad_recv_wc, newwin);
660 goto out; /* Unmatched or DS RMPP ACK */
661 }
662
663 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) &&
664 (mad_send_wr->timeout)) {
665 spin_unlock_irqrestore(&agent->lock, flags);
666 ack_ds_ack(agent, mad_recv_wc);
667 return; /* Repeated ACK for DS RMPP transaction */
668 }
669
670 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
671 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
672 goto out; /* Send is already done */
673
674 if (seg_num > mad_send_wr->send_buf.seg_count ||
675 seg_num > mad_send_wr->newwin) {
676 spin_unlock_irqrestore(&agent->lock, flags);
677 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
678 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
679 return;
680 }
681
682 if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack)
683 goto out; /* Old ACK */
684
685 if (seg_num > mad_send_wr->last_ack) {
686 adjust_last_ack(mad_send_wr, seg_num);
687 mad_send_wr->retries = mad_send_wr->send_buf.retries;
688 }
689 mad_send_wr->newwin = newwin;
690 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
691 /* If no response is expected, the ACK completes the send */
692 if (!mad_send_wr->send_buf.timeout_ms) {
693 struct ib_mad_send_wc wc;
694
695 ib_mark_mad_done(mad_send_wr);
696 spin_unlock_irqrestore(&agent->lock, flags);
697
698 wc.status = IB_WC_SUCCESS;
699 wc.vendor_err = 0;
700 wc.send_buf = &mad_send_wr->send_buf;
701 ib_mad_complete_send_wr(mad_send_wr, &wc);
702 return;
703 }
704 if (mad_send_wr->refcount == 1)
705 ib_reset_mad_timeout(mad_send_wr,
706 mad_send_wr->send_buf.timeout_ms);
707 spin_unlock_irqrestore(&agent->lock, flags);
708 ack_ds_ack(agent, mad_recv_wc);
709 return;
710 } else if (mad_send_wr->refcount == 1 &&
711 mad_send_wr->seg_num < mad_send_wr->newwin &&
712 mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) {
713 /* Send failure will just result in a timeout/retry */
714 ret = send_next_seg(mad_send_wr);
715 if (ret)
716 goto out;
717
718 mad_send_wr->refcount++;
719 list_move_tail(&mad_send_wr->agent_list,
720 &mad_send_wr->mad_agent_priv->send_list);
721 }
722 out:
723 spin_unlock_irqrestore(&agent->lock, flags);
724 }
725
726 static struct ib_mad_recv_wc *
727 process_rmpp_data(struct ib_mad_agent_private *agent,
728 struct ib_mad_recv_wc *mad_recv_wc)
729 {
730 struct ib_rmpp_hdr *rmpp_hdr;
731 u8 rmpp_status;
732
733 rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr;
734
735 if (rmpp_hdr->rmpp_status) {
736 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS;
737 goto bad;
738 }
739
740 if (rmpp_hdr->seg_num == __constant_htonl(1)) {
741 if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) {
742 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
743 goto bad;
744 }
745 return start_rmpp(agent, mad_recv_wc);
746 } else {
747 if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) {
748 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
749 goto bad;
750 }
751 return continue_rmpp(agent, mad_recv_wc);
752 }
753 bad:
754 nack_recv(agent, mad_recv_wc, rmpp_status);
755 ib_free_recv_mad(mad_recv_wc);
756 return NULL;
757 }
758
759 static void process_rmpp_stop(struct ib_mad_agent_private *agent,
760 struct ib_mad_recv_wc *mad_recv_wc)
761 {
762 struct ib_rmpp_mad *rmpp_mad;
763
764 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
765
766 if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) {
767 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
768 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
769 } else
770 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
771 }
772
773 static void process_rmpp_abort(struct ib_mad_agent_private *agent,
774 struct ib_mad_recv_wc *mad_recv_wc)
775 {
776 struct ib_rmpp_mad *rmpp_mad;
777
778 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
779
780 if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN ||
781 rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) {
782 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
783 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
784 } else
785 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
786 }
787
788 struct ib_mad_recv_wc *
789 ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent,
790 struct ib_mad_recv_wc *mad_recv_wc)
791 {
792 struct ib_rmpp_mad *rmpp_mad;
793
794 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
795 if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE))
796 return mad_recv_wc;
797
798 if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) {
799 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
800 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
801 goto out;
802 }
803
804 switch (rmpp_mad->rmpp_hdr.rmpp_type) {
805 case IB_MGMT_RMPP_TYPE_DATA:
806 return process_rmpp_data(agent, mad_recv_wc);
807 case IB_MGMT_RMPP_TYPE_ACK:
808 process_rmpp_ack(agent, mad_recv_wc);
809 break;
810 case IB_MGMT_RMPP_TYPE_STOP:
811 process_rmpp_stop(agent, mad_recv_wc);
812 break;
813 case IB_MGMT_RMPP_TYPE_ABORT:
814 process_rmpp_abort(agent, mad_recv_wc);
815 break;
816 default:
817 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
818 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
819 break;
820 }
821 out:
822 ib_free_recv_mad(mad_recv_wc);
823 return NULL;
824 }
825
826 static int init_newwin(struct ib_mad_send_wr_private *mad_send_wr)
827 {
828 struct ib_mad_agent_private *agent = mad_send_wr->mad_agent_priv;
829 struct ib_mad_hdr *mad_hdr = mad_send_wr->send_buf.mad;
830 struct mad_rmpp_recv *rmpp_recv;
831 struct ib_ah_attr ah_attr;
832 unsigned long flags;
833 int newwin = 1;
834
835 if (!(mad_hdr->method & IB_MGMT_METHOD_RESP))
836 goto out;
837
838 spin_lock_irqsave(&agent->lock, flags);
839 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
840 if (rmpp_recv->tid != mad_hdr->tid ||
841 rmpp_recv->mgmt_class != mad_hdr->mgmt_class ||
842 rmpp_recv->class_version != mad_hdr->class_version ||
843 (rmpp_recv->method & IB_MGMT_METHOD_RESP))
844 continue;
845
846 if (ib_query_ah(mad_send_wr->send_buf.ah, &ah_attr))
847 continue;
848
849 if (rmpp_recv->slid == ah_attr.dlid) {
850 newwin = rmpp_recv->repwin;
851 break;
852 }
853 }
854 spin_unlock_irqrestore(&agent->lock, flags);
855 out:
856 return newwin;
857 }
858
859 int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
860 {
861 struct ib_rmpp_mad *rmpp_mad;
862 int ret;
863
864 rmpp_mad = mad_send_wr->send_buf.mad;
865 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
866 IB_MGMT_RMPP_FLAG_ACTIVE))
867 return IB_RMPP_RESULT_UNHANDLED;
868
869 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) {
870 mad_send_wr->seg_num = 1;
871 return IB_RMPP_RESULT_INTERNAL;
872 }
873
874 mad_send_wr->newwin = init_newwin(mad_send_wr);
875
876 /* We need to wait for the final ACK even if there isn't a response */
877 mad_send_wr->refcount += (mad_send_wr->timeout == 0);
878 ret = send_next_seg(mad_send_wr);
879 if (!ret)
880 return IB_RMPP_RESULT_CONSUMED;
881 return ret;
882 }
883
884 int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr,
885 struct ib_mad_send_wc *mad_send_wc)
886 {
887 struct ib_rmpp_mad *rmpp_mad;
888 int ret;
889
890 rmpp_mad = mad_send_wr->send_buf.mad;
891 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
892 IB_MGMT_RMPP_FLAG_ACTIVE))
893 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
894
895 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
896 return IB_RMPP_RESULT_INTERNAL; /* ACK, STOP, or ABORT */
897
898 if (mad_send_wc->status != IB_WC_SUCCESS ||
899 mad_send_wr->status != IB_WC_SUCCESS)
900 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */
901
902 if (!mad_send_wr->timeout)
903 return IB_RMPP_RESULT_PROCESSED; /* Response received */
904
905 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
906 mad_send_wr->timeout =
907 msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
908 return IB_RMPP_RESULT_PROCESSED; /* Send done */
909 }
910
911 if (mad_send_wr->seg_num == mad_send_wr->newwin ||
912 mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count)
913 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */
914
915 ret = send_next_seg(mad_send_wr);
916 if (ret) {
917 mad_send_wc->status = IB_WC_GENERAL_ERR;
918 return IB_RMPP_RESULT_PROCESSED;
919 }
920 return IB_RMPP_RESULT_CONSUMED;
921 }
922
923 int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr)
924 {
925 struct ib_rmpp_mad *rmpp_mad;
926 int ret;
927
928 rmpp_mad = mad_send_wr->send_buf.mad;
929 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
930 IB_MGMT_RMPP_FLAG_ACTIVE))
931 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
932
933 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count)
934 return IB_RMPP_RESULT_PROCESSED;
935
936 mad_send_wr->seg_num = mad_send_wr->last_ack;
937 mad_send_wr->cur_seg = mad_send_wr->last_ack_seg;
938
939 ret = send_next_seg(mad_send_wr);
940 if (ret)
941 return IB_RMPP_RESULT_PROCESSED;
942
943 return IB_RMPP_RESULT_CONSUMED;
944 }
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