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This client driver allows you to use a GPIO pin as a source for PPS
[linux-2.6/next.git] / drivers / infiniband / core / mad_rmpp.c
blobf37878c9c06eb43812b022ba72a034418a1a238e
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
39 enum rmpp_state {
40 RMPP_STATE_ACTIVE,
41 RMPP_STATE_TIMEOUT,
42 RMPP_STATE_COMPLETE,
43 RMPP_STATE_CANCELING
44 };
45
46 struct 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
72 static 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
78 static 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
86 void 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
113 static 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
133 static 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
153 static 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
179 static 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
205 void 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
212 static 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
241 static 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
263 static 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
279 static struct mad_rmpp_recv *
280 create_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
321 error: kfree(rmpp_recv);
322 return NULL;
323 }
324
325 static struct mad_rmpp_recv *
326 find_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
344 static struct mad_rmpp_recv *
345 acquire_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
359 static struct mad_rmpp_recv *
360 insert_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
372 static 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
380 static 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
388 static 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
397 static 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
402 static 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
418 static 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
430 static 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
446 static 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
462 static struct ib_mad_recv_wc *
463 continue_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);
511 out:
512 deref_rmpp_recv(rmpp_recv);
513 return done_wc;
514
515 drop3: spin_unlock_irqrestore(&rmpp_recv->lock, flags);
516 drop2: deref_rmpp_recv(rmpp_recv);
517 drop1: ib_free_recv_mad(mad_recv_wc);
518 return NULL;
519 }
520
521 static struct ib_mad_recv_wc *
522 start_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
561 static 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
591 static 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;
615 out:
616 spin_unlock_irqrestore(&agent->lock, flags);
617 }
618
619 static 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
631 static 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
641 static 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 }
731 out:
732 spin_unlock_irqrestore(&agent->lock, flags);
733 }
734
735 static struct ib_mad_recv_wc *
736 process_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 }
762 bad:
763 nack_recv(agent, mad_recv_wc, rmpp_status);
764 ib_free_recv_mad(mad_recv_wc);
765 return NULL;
766 }
767
768 static 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
782 static 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
797 struct ib_mad_recv_wc *
798 ib_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 }
830 out:
831 ib_free_recv_mad(mad_recv_wc);
832 return NULL;
833 }
834
835 static 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);
864 out:
865 return newwin;
866 }
867
868 int 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
893 int 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
932 int 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 }
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