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[net-next-2.6.git] / drivers / infiniband / core / mad_rmpp.c
CommitLineData
fa619a77
HR		 1/*
2 * Copyright (c) 2005 Intel Inc. All rights reserved.
3 * Copyright (c) 2005 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 <linux/dma-mapping.h>
37
38#include "mad_priv.h"
39#include "mad_rmpp.h"
40
41enum rmpp_state {
42 RMPP_STATE_ACTIVE,
43 RMPP_STATE_TIMEOUT,
44 RMPP_STATE_COMPLETE
45};
46
47struct mad_rmpp_recv {
48 struct ib_mad_agent_private *agent;
49 struct list_head list;
50 struct work_struct timeout_work;
51 struct work_struct cleanup_work;
52 wait_queue_head_t wait;
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
97f52eb4 64 __be64 tid;
fa619a77
HR		 65 u32 src_qp;
66 u16 slid;
67 u8 mgmt_class;
68 u8 class_version;
69 u8 method;
70};
71
72static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
73{
74 atomic_dec(&rmpp_recv->refcount);
75 wait_event(rmpp_recv->wait, !atomic_read(&rmpp_recv->refcount));
76 ib_destroy_ah(rmpp_recv->ah);
77 kfree(rmpp_recv);
78}
79
80void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent)
81{
82 struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv;
83 unsigned long flags;
84
85 spin_lock_irqsave(&agent->lock, flags);
86 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
87 cancel_delayed_work(&rmpp_recv->timeout_work);
88 cancel_delayed_work(&rmpp_recv->cleanup_work);
89 }
90 spin_unlock_irqrestore(&agent->lock, flags);
91
92 flush_workqueue(agent->qp_info->port_priv->wq);
93
94 list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv,
95 &agent->rmpp_list, list) {
96 list_del(&rmpp_recv->list);
97 if (rmpp_recv->state != RMPP_STATE_COMPLETE)
98 ib_free_recv_mad(rmpp_recv->rmpp_wc);
99 destroy_rmpp_recv(rmpp_recv);
100 }
101}
102
fe9e08e1
SH		 103static int data_offset(u8 mgmt_class)
104{
105 if (mgmt_class == IB_MGMT_CLASS_SUBN_ADM)
34816ad9 106 return IB_MGMT_SA_HDR;
fe9e08e1
SH		 107 else if ((mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
108 (mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END))
34816ad9 109 return IB_MGMT_VENDOR_HDR;
fe9e08e1 110 else
34816ad9 111 return IB_MGMT_RMPP_HDR;
fe9e08e1
SH		 112}
113
114static void format_ack(struct ib_rmpp_mad *ack,
115 struct ib_rmpp_mad *data,
116 struct mad_rmpp_recv *rmpp_recv)
117{
118 unsigned long flags;
119
120 memcpy(&ack->mad_hdr, &data->mad_hdr,
121 data_offset(data->mad_hdr.mgmt_class));
122
123 ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
124 ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK;
125 ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
126
127 spin_lock_irqsave(&rmpp_recv->lock, flags);
128 rmpp_recv->last_ack = rmpp_recv->seg_num;
129 ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num);
130 ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin);
131 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
132}
133
134static void ack_recv(struct mad_rmpp_recv *rmpp_recv,
135 struct ib_mad_recv_wc *recv_wc)
136{
137 struct ib_mad_send_buf *msg;
34816ad9 138 int ret;
fe9e08e1 139
fe9e08e1 140 msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp,
34816ad9
SH		 141 recv_wc->wc->pkey_index, 1, IB_MGMT_RMPP_HDR,
142 IB_MGMT_RMPP_DATA, GFP_KERNEL);
fe9e08e1
SH		 143 if (!msg)
144 return;
145
34816ad9
SH		 146 format_ack(msg->mad, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad,
147 rmpp_recv);
148 msg->ah = rmpp_recv->ah;
149 ret = ib_post_send_mad(msg, NULL);
fe9e08e1
SH		 150 if (ret)
151 ib_free_send_mad(msg);
152}
153
7cc656ef
RD		 154static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent,
155 struct ib_mad_recv_wc *recv_wc)
fe9e08e1 156{
7cc656ef 157 struct ib_mad_send_buf *msg;
fe9e08e1 158 struct ib_ah *ah;
fe9e08e1
SH		 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))
7cc656ef 163 return (void *) ah;
fe9e08e1 164
7cc656ef
RD		 165 msg = ib_create_send_mad(agent, recv_wc->wc->src_qp,
166 recv_wc->wc->pkey_index, 1,
167 IB_MGMT_RMPP_HDR, IB_MGMT_RMPP_DATA,
168 GFP_KERNEL);
169 if (IS_ERR(msg))
fe9e08e1 170 ib_destroy_ah(ah);
7cc656ef
RD		 171 else
172 msg->ah = ah;
173
174 return msg;
fe9e08e1
SH		 175}
176
34816ad9 177void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc)
fe9e08e1 178{
34816ad9
SH		 179 struct ib_rmpp_mad *rmpp_mad = mad_send_wc->send_buf->mad;
180
181 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_ACK)
182 ib_destroy_ah(mad_send_wc->send_buf->ah);
183 ib_free_send_mad(mad_send_wc->send_buf);
fe9e08e1
SH		 184}
185
186static void nack_recv(struct ib_mad_agent_private *agent,
187 struct ib_mad_recv_wc *recv_wc, u8 rmpp_status)
188{
189 struct ib_mad_send_buf *msg;
190 struct ib_rmpp_mad *rmpp_mad;
fe9e08e1
SH		 191 int ret;
192
7cc656ef
RD		 193 msg = alloc_response_msg(&agent->agent, recv_wc);
194 if (IS_ERR(msg))
fe9e08e1
SH		 195 return;
196
34816ad9 197 rmpp_mad = msg->mad;
fe9e08e1
SH		 198 memcpy(rmpp_mad, recv_wc->recv_buf.mad,
199 data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class));
200
201 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
202 rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION;
203 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ABORT;
204 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
205 rmpp_mad->rmpp_hdr.rmpp_status = rmpp_status;
206 rmpp_mad->rmpp_hdr.seg_num = 0;
207 rmpp_mad->rmpp_hdr.paylen_newwin = 0;
208
34816ad9
SH		 209 ret = ib_post_send_mad(msg, NULL);
210 if (ret) {
211 ib_destroy_ah(msg->ah);
212 ib_free_send_mad(msg);
213 }
fe9e08e1
SH		 214}
215
fa619a77
HR		 216static void recv_timeout_handler(void *data)
217{
218 struct mad_rmpp_recv *rmpp_recv = data;
219 struct ib_mad_recv_wc *rmpp_wc;
220 unsigned long flags;
221
222 spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
223 if (rmpp_recv->state != RMPP_STATE_ACTIVE) {
224 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
225 return;
226 }
227 rmpp_recv->state = RMPP_STATE_TIMEOUT;
228 list_del(&rmpp_recv->list);
229 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
230
fa619a77 231 rmpp_wc = rmpp_recv->rmpp_wc;
fe9e08e1 232 nack_recv(rmpp_recv->agent, rmpp_wc, IB_MGMT_RMPP_STATUS_T2L);
fa619a77
HR		 233 destroy_rmpp_recv(rmpp_recv);
234 ib_free_recv_mad(rmpp_wc);
235}
236
237static void recv_cleanup_handler(void *data)
238{
239 struct mad_rmpp_recv *rmpp_recv = data;
240 unsigned long flags;
241
242 spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
243 list_del(&rmpp_recv->list);
244 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
245 destroy_rmpp_recv(rmpp_recv);
246}
247
248static struct mad_rmpp_recv *
249create_rmpp_recv(struct ib_mad_agent_private *agent,
250 struct ib_mad_recv_wc *mad_recv_wc)
251{
252 struct mad_rmpp_recv *rmpp_recv;
253 struct ib_mad_hdr *mad_hdr;
254
255 rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL);
256 if (!rmpp_recv)
257 return NULL;
258
259 rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd,
260 mad_recv_wc->wc,
261 mad_recv_wc->recv_buf.grh,
262 agent->agent.port_num);
263 if (IS_ERR(rmpp_recv->ah))
264 goto error;
265
266 rmpp_recv->agent = agent;
267 init_waitqueue_head(&rmpp_recv->wait);
268 INIT_WORK(&rmpp_recv->timeout_work, recv_timeout_handler, rmpp_recv);
269 INIT_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler, rmpp_recv);
270 spin_lock_init(&rmpp_recv->lock);
271 rmpp_recv->state = RMPP_STATE_ACTIVE;
272 atomic_set(&rmpp_recv->refcount, 1);
273
274 rmpp_recv->rmpp_wc = mad_recv_wc;
275 rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf;
276 rmpp_recv->newwin = 1;
277 rmpp_recv->seg_num = 1;
278 rmpp_recv->last_ack = 0;
279
280 mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
281 rmpp_recv->tid = mad_hdr->tid;
282 rmpp_recv->src_qp = mad_recv_wc->wc->src_qp;
283 rmpp_recv->slid = mad_recv_wc->wc->slid;
284 rmpp_recv->mgmt_class = mad_hdr->mgmt_class;
285 rmpp_recv->class_version = mad_hdr->class_version;
286 rmpp_recv->method = mad_hdr->method;
287 return rmpp_recv;
288
289error: kfree(rmpp_recv);
290 return NULL;
291}
292
293static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
294{
295 if (atomic_dec_and_test(&rmpp_recv->refcount))
296 wake_up(&rmpp_recv->wait);
297}
298
299static struct mad_rmpp_recv *
300find_rmpp_recv(struct ib_mad_agent_private *agent,
301 struct ib_mad_recv_wc *mad_recv_wc)
302{
303 struct mad_rmpp_recv *rmpp_recv;
304 struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
305
306 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
307 if (rmpp_recv->tid == mad_hdr->tid &&
308 rmpp_recv->src_qp == mad_recv_wc->wc->src_qp &&
309 rmpp_recv->slid == mad_recv_wc->wc->slid &&
310 rmpp_recv->mgmt_class == mad_hdr->mgmt_class &&
311 rmpp_recv->class_version == mad_hdr->class_version &&
312 rmpp_recv->method == mad_hdr->method)
313 return rmpp_recv;
314 }
315 return NULL;
316}
317
318static struct mad_rmpp_recv *
319acquire_rmpp_recv(struct ib_mad_agent_private *agent,
320 struct ib_mad_recv_wc *mad_recv_wc)
321{
322 struct mad_rmpp_recv *rmpp_recv;
323 unsigned long flags;
324
325 spin_lock_irqsave(&agent->lock, flags);
326 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
327 if (rmpp_recv)
328 atomic_inc(&rmpp_recv->refcount);
329 spin_unlock_irqrestore(&agent->lock, flags);
330 return rmpp_recv;
331}
332
333static struct mad_rmpp_recv *
334insert_rmpp_recv(struct ib_mad_agent_private *agent,
335 struct mad_rmpp_recv *rmpp_recv)
336{
337 struct mad_rmpp_recv *cur_rmpp_recv;
338
339 cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc);
340 if (!cur_rmpp_recv)
341 list_add_tail(&rmpp_recv->list, &agent->rmpp_list);
342
343 return cur_rmpp_recv;
344}
345
fa619a77
HR		 346static inline int get_last_flag(struct ib_mad_recv_buf *seg)
347{
348 struct ib_rmpp_mad *rmpp_mad;
349
350 rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
351 return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST;
352}
353
354static inline int get_seg_num(struct ib_mad_recv_buf *seg)
355{
356 struct ib_rmpp_mad *rmpp_mad;
357
358 rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
359 return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
360}
361
362static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list,
363 struct ib_mad_recv_buf *seg)
364{
365 if (seg->list.next == rmpp_list)
366 return NULL;
367
368 return container_of(seg->list.next, struct ib_mad_recv_buf, list);
369}
370
371static inline int window_size(struct ib_mad_agent_private *agent)
372{
373 return max(agent->qp_info->recv_queue.max_active >> 3, 1);
374}
375
376static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list,
377 int seg_num)
378{
379 struct ib_mad_recv_buf *seg_buf;
380 int cur_seg_num;
381
382 list_for_each_entry_reverse(seg_buf, rmpp_list, list) {
383 cur_seg_num = get_seg_num(seg_buf);
384 if (seg_num > cur_seg_num)
385 return seg_buf;
386 if (seg_num == cur_seg_num)
387 break;
388 }
389 return NULL;
390}
391
392static void update_seg_num(struct mad_rmpp_recv *rmpp_recv,
393 struct ib_mad_recv_buf *new_buf)
394{
395 struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list;
396
397 while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) {
398 rmpp_recv->cur_seg_buf = new_buf;
399 rmpp_recv->seg_num++;
400 new_buf = get_next_seg(rmpp_list, new_buf);
401 }
402}
403
404static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv)
405{
406 struct ib_rmpp_mad *rmpp_mad;
407 int hdr_size, data_size, pad;
408
409 rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad;
410
411 hdr_size = data_offset(rmpp_mad->mad_hdr.mgmt_class);
412 data_size = sizeof(struct ib_rmpp_mad) - hdr_size;
f2065e42
HR		 413 pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
414 if (pad > IB_MGMT_RMPP_DATA || pad < 0)
fa619a77
HR		 415 pad = 0;
416
417 return hdr_size + rmpp_recv->seg_num * data_size - pad;
418}
419
420static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv)
421{
422 struct ib_mad_recv_wc *rmpp_wc;
423
424 ack_recv(rmpp_recv, rmpp_recv->rmpp_wc);
425 if (rmpp_recv->seg_num > 1)
426 cancel_delayed_work(&rmpp_recv->timeout_work);
427
428 rmpp_wc = rmpp_recv->rmpp_wc;
429 rmpp_wc->mad_len = get_mad_len(rmpp_recv);
430 /* 10 seconds until we can find the packet lifetime */
431 queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq,
432 &rmpp_recv->cleanup_work, msecs_to_jiffies(10000));
433 return rmpp_wc;
434}
435
436void ib_coalesce_recv_mad(struct ib_mad_recv_wc *mad_recv_wc, void *buf)
437{
438 struct ib_mad_recv_buf *seg_buf;
439 struct ib_rmpp_mad *rmpp_mad;
440 void *data;
441 int size, len, offset;
442 u8 flags;
443
444 len = mad_recv_wc->mad_len;
445 if (len <= sizeof(struct ib_mad)) {
446 memcpy(buf, mad_recv_wc->recv_buf.mad, len);
447 return;
448 }
449
450 offset = data_offset(mad_recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
451
452 list_for_each_entry(seg_buf, &mad_recv_wc->rmpp_list, list) {
453 rmpp_mad = (struct ib_rmpp_mad *)seg_buf->mad;
454 flags = ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr);
455
456 if (flags & IB_MGMT_RMPP_FLAG_FIRST) {
457 data = rmpp_mad;
458 size = sizeof(*rmpp_mad);
459 } else {
460 data = (void *) rmpp_mad + offset;
461 if (flags & IB_MGMT_RMPP_FLAG_LAST)
462 size = len;
463 else
464 size = sizeof(*rmpp_mad) - offset;
465 }
466
467 memcpy(buf, data, size);
468 len -= size;
469 buf += size;
470 }
471}
472EXPORT_SYMBOL(ib_coalesce_recv_mad);
473
474static struct ib_mad_recv_wc *
475continue_rmpp(struct ib_mad_agent_private *agent,
476 struct ib_mad_recv_wc *mad_recv_wc)
477{
478 struct mad_rmpp_recv *rmpp_recv;
479 struct ib_mad_recv_buf *prev_buf;
480 struct ib_mad_recv_wc *done_wc;
481 int seg_num;
482 unsigned long flags;
483
484 rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc);
485 if (!rmpp_recv)
486 goto drop1;
487
488 seg_num = get_seg_num(&mad_recv_wc->recv_buf);
489
490 spin_lock_irqsave(&rmpp_recv->lock, flags);
491 if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) ||
492 (seg_num > rmpp_recv->newwin))
493 goto drop3;
494
495 if ((seg_num <= rmpp_recv->last_ack) ||
496 (rmpp_recv->state == RMPP_STATE_COMPLETE)) {
497 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
498 ack_recv(rmpp_recv, mad_recv_wc);
499 goto drop2;
500 }
501
502 prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num);
503 if (!prev_buf)
504 goto drop3;
505
506 done_wc = NULL;
507 list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list);
508 if (rmpp_recv->cur_seg_buf == prev_buf) {
509 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf);
510 if (get_last_flag(rmpp_recv->cur_seg_buf)) {
511 rmpp_recv->state = RMPP_STATE_COMPLETE;
512 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
513 done_wc = complete_rmpp(rmpp_recv);
514 goto out;
515 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) {
516 rmpp_recv->newwin += window_size(agent);
517 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
518 ack_recv(rmpp_recv, mad_recv_wc);
519 goto out;
520 }
521 }
522 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
523out:
524 deref_rmpp_recv(rmpp_recv);
525 return done_wc;
526
527drop3: spin_unlock_irqrestore(&rmpp_recv->lock, flags);
528drop2: deref_rmpp_recv(rmpp_recv);
529drop1: ib_free_recv_mad(mad_recv_wc);
530 return NULL;
531}
532
533static struct ib_mad_recv_wc *
534start_rmpp(struct ib_mad_agent_private *agent,
535 struct ib_mad_recv_wc *mad_recv_wc)
536{
537 struct mad_rmpp_recv *rmpp_recv;
538 unsigned long flags;
539
540 rmpp_recv = create_rmpp_recv(agent, mad_recv_wc);
541 if (!rmpp_recv) {
542 ib_free_recv_mad(mad_recv_wc);
543 return NULL;
544 }
545
546 spin_lock_irqsave(&agent->lock, flags);
547 if (insert_rmpp_recv(agent, rmpp_recv)) {
548 spin_unlock_irqrestore(&agent->lock, flags);
549 /* duplicate first MAD */
550 destroy_rmpp_recv(rmpp_recv);
551 return continue_rmpp(agent, mad_recv_wc);
552 }
553 atomic_inc(&rmpp_recv->refcount);
554
555 if (get_last_flag(&mad_recv_wc->recv_buf)) {
556 rmpp_recv->state = RMPP_STATE_COMPLETE;
557 spin_unlock_irqrestore(&agent->lock, flags);
558 complete_rmpp(rmpp_recv);
559 } else {
560 spin_unlock_irqrestore(&agent->lock, flags);
561 /* 40 seconds until we can find the packet lifetimes */
562 queue_delayed_work(agent->qp_info->port_priv->wq,
563 &rmpp_recv->timeout_work,
564 msecs_to_jiffies(40000));
565 rmpp_recv->newwin += window_size(agent);
566 ack_recv(rmpp_recv, mad_recv_wc);
567 mad_recv_wc = NULL;
568 }
569 deref_rmpp_recv(rmpp_recv);
570 return mad_recv_wc;
571}
572
573static inline u64 get_seg_addr(struct ib_mad_send_wr_private *mad_send_wr)
574{
575 return mad_send_wr->sg_list[0].addr + mad_send_wr->data_offset +
576 (sizeof(struct ib_rmpp_mad) - mad_send_wr->data_offset) *
577 (mad_send_wr->seg_num - 1);
578}
579
580static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr)
581{
582 struct ib_rmpp_mad *rmpp_mad;
583 int timeout;
972d512a 584 u32 paylen;
fa619a77 585
34816ad9 586 rmpp_mad = mad_send_wr->send_buf.mad;
fa619a77
HR		 587 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
588 rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(mad_send_wr->seg_num);
589
590 if (mad_send_wr->seg_num == 1) {
591 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST;
972d512a
SH		 592 paylen = mad_send_wr->total_seg * IB_MGMT_RMPP_DATA -
593 mad_send_wr->pad;
594 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
fa619a77
HR		 595 mad_send_wr->sg_list[0].length = sizeof(struct ib_rmpp_mad);
596 } else {
597 mad_send_wr->send_wr.num_sge = 2;
598 mad_send_wr->sg_list[0].length = mad_send_wr->data_offset;
599 mad_send_wr->sg_list[1].addr = get_seg_addr(mad_send_wr);
600 mad_send_wr->sg_list[1].length = sizeof(struct ib_rmpp_mad) -
601 mad_send_wr->data_offset;
602 mad_send_wr->sg_list[1].lkey = mad_send_wr->sg_list[0].lkey;
b5dcbf47 603 rmpp_mad->rmpp_hdr.paylen_newwin = 0;
fa619a77
HR		 604 }
605
606 if (mad_send_wr->seg_num == mad_send_wr->total_seg) {
607 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST;
972d512a
SH		 608 paylen = IB_MGMT_RMPP_DATA - mad_send_wr->pad;
609 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
fa619a77
HR		 610 }
611
612 /* 2 seconds for an ACK until we can find the packet lifetime */
34816ad9 613 timeout = mad_send_wr->send_buf.timeout_ms;
fa619a77
HR		 614 if (!timeout || timeout > 2000)
615 mad_send_wr->timeout = msecs_to_jiffies(2000);
616 mad_send_wr->seg_num++;
617 return ib_send_mad(mad_send_wr);
618}
619
fe9e08e1
SH		 620static void abort_send(struct ib_mad_agent_private *agent, __be64 tid,
621 u8 rmpp_status)
622{
623 struct ib_mad_send_wr_private *mad_send_wr;
624 struct ib_mad_send_wc wc;
625 unsigned long flags;
626
627 spin_lock_irqsave(&agent->lock, flags);
628 mad_send_wr = ib_find_send_mad(agent, tid);
629 if (!mad_send_wr)
630 goto out; /* Unmatched send */
631
632 if ((mad_send_wr->last_ack == mad_send_wr->total_seg) ||
633 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
634 goto out; /* Send is already done */
635
636 ib_mark_mad_done(mad_send_wr);
637 spin_unlock_irqrestore(&agent->lock, flags);
638
639 wc.status = IB_WC_REM_ABORT_ERR;
640 wc.vendor_err = rmpp_status;
34816ad9 641 wc.send_buf = &mad_send_wr->send_buf;
fe9e08e1
SH		 642 ib_mad_complete_send_wr(mad_send_wr, &wc);
643 return;
644out:
645 spin_unlock_irqrestore(&agent->lock, flags);
646}
647
fa619a77
HR		 648static void process_rmpp_ack(struct ib_mad_agent_private *agent,
649 struct ib_mad_recv_wc *mad_recv_wc)
650{
651 struct ib_mad_send_wr_private *mad_send_wr;
652 struct ib_rmpp_mad *rmpp_mad;
653 unsigned long flags;
654 int seg_num, newwin, ret;
655
656 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
fe9e08e1
SH		 657 if (rmpp_mad->rmpp_hdr.rmpp_status) {
658 abort_send(agent, rmpp_mad->mad_hdr.tid,
659 IB_MGMT_RMPP_STATUS_BAD_STATUS);
660 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
fa619a77 661 return;
fe9e08e1 662 }
fa619a77
HR		 663
664 seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
665 newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
fe9e08e1
SH		 666 if (newwin < seg_num) {
667 abort_send(agent, rmpp_mad->mad_hdr.tid,
668 IB_MGMT_RMPP_STATUS_W2S);
669 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
670 return;
671 }
fa619a77
HR		 672
673 spin_lock_irqsave(&agent->lock, flags);
674 mad_send_wr = ib_find_send_mad(agent, rmpp_mad->mad_hdr.tid);
675 if (!mad_send_wr)
676 goto out; /* Unmatched ACK */
677
678 if ((mad_send_wr->last_ack == mad_send_wr->total_seg) ||
679 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
680 goto out; /* Send is already done */
681
fe9e08e1
SH		 682 if (seg_num > mad_send_wr->total_seg || seg_num > mad_send_wr->newwin) {
683 spin_unlock_irqrestore(&agent->lock, flags);
684 abort_send(agent, rmpp_mad->mad_hdr.tid,
685 IB_MGMT_RMPP_STATUS_S2B);
686 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
687 return;
688 }
fa619a77
HR		 689
690 if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack)
691 goto out; /* Old ACK */
692
693 if (seg_num > mad_send_wr->last_ack) {
694 mad_send_wr->last_ack = seg_num;
34816ad9 695 mad_send_wr->retries = mad_send_wr->send_buf.retries;
fa619a77
HR		 696 }
697 mad_send_wr->newwin = newwin;
698 if (mad_send_wr->last_ack == mad_send_wr->total_seg) {
699 /* If no response is expected, the ACK completes the send */
34816ad9 700 if (!mad_send_wr->send_buf.timeout_ms) {
fa619a77
HR		 701 struct ib_mad_send_wc wc;
702
703 ib_mark_mad_done(mad_send_wr);
704 spin_unlock_irqrestore(&agent->lock, flags);
705
706 wc.status = IB_WC_SUCCESS;
707 wc.vendor_err = 0;
34816ad9 708 wc.send_buf = &mad_send_wr->send_buf;
fa619a77
HR		 709 ib_mad_complete_send_wr(mad_send_wr, &wc);
710 return;
711 }
712 if (mad_send_wr->refcount == 1)
34816ad9
SH		 713 ib_reset_mad_timeout(mad_send_wr,
714 mad_send_wr->send_buf.timeout_ms);
fa619a77
HR		 715 } else if (mad_send_wr->refcount == 1 &&
716 mad_send_wr->seg_num < mad_send_wr->newwin &&
717 mad_send_wr->seg_num <= mad_send_wr->total_seg) {
718 /* Send failure will just result in a timeout/retry */
719 ret = send_next_seg(mad_send_wr);
720 if (ret)
721 goto out;
722
723 mad_send_wr->refcount++;
724 list_del(&mad_send_wr->agent_list);
725 list_add_tail(&mad_send_wr->agent_list,
726 &mad_send_wr->mad_agent_priv->send_list);
727 }
728out:
729 spin_unlock_irqrestore(&agent->lock, flags);
730}
731
fe9e08e1
SH		 732static struct ib_mad_recv_wc *
733process_rmpp_data(struct ib_mad_agent_private *agent,
734 struct ib_mad_recv_wc *mad_recv_wc)
735{
736 struct ib_rmpp_hdr *rmpp_hdr;
737 u8 rmpp_status;
738
739 rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr;
740
741 if (rmpp_hdr->rmpp_status) {
742 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS;
743 goto bad;
744 }
745
746 if (rmpp_hdr->seg_num == __constant_htonl(1)) {
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 start_rmpp(agent, mad_recv_wc);
752 } else {
753 if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) {
754 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
755 goto bad;
756 }
757 return continue_rmpp(agent, mad_recv_wc);
758 }
759bad:
760 nack_recv(agent, mad_recv_wc, rmpp_status);
761 ib_free_recv_mad(mad_recv_wc);
762 return NULL;
763}
764
765static void process_rmpp_stop(struct ib_mad_agent_private *agent,
766 struct ib_mad_recv_wc *mad_recv_wc)
767{
768 struct ib_rmpp_mad *rmpp_mad;
769
770 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
771
772 if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) {
773 abort_send(agent, rmpp_mad->mad_hdr.tid,
774 IB_MGMT_RMPP_STATUS_BAD_STATUS);
775 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
776 } else
777 abort_send(agent, rmpp_mad->mad_hdr.tid,
778 rmpp_mad->rmpp_hdr.rmpp_status);
779}
780
781static void process_rmpp_abort(struct ib_mad_agent_private *agent,
782 struct ib_mad_recv_wc *mad_recv_wc)
783{
784 struct ib_rmpp_mad *rmpp_mad;
785
786 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
787
788 if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN ||
789 rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) {
790 abort_send(agent, rmpp_mad->mad_hdr.tid,
791 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, rmpp_mad->mad_hdr.tid,
795 rmpp_mad->rmpp_hdr.rmpp_status);
796}
797
fa619a77
HR		 798struct ib_mad_recv_wc *
799ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent,
800 struct ib_mad_recv_wc *mad_recv_wc)
801{
802 struct ib_rmpp_mad *rmpp_mad;
803
804 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
805 if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE))
806 return mad_recv_wc;
807
fe9e08e1
SH		 808 if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) {
809 abort_send(agent, rmpp_mad->mad_hdr.tid,
810 IB_MGMT_RMPP_STATUS_UNV);
811 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
fa619a77 812 goto out;
fe9e08e1 813 }
fa619a77
HR		 814
815 switch (rmpp_mad->rmpp_hdr.rmpp_type) {
816 case IB_MGMT_RMPP_TYPE_DATA:
fe9e08e1 817 return process_rmpp_data(agent, mad_recv_wc);
fa619a77
HR		 818 case IB_MGMT_RMPP_TYPE_ACK:
819 process_rmpp_ack(agent, mad_recv_wc);
820 break;
821 case IB_MGMT_RMPP_TYPE_STOP:
fe9e08e1
SH		 822 process_rmpp_stop(agent, mad_recv_wc);
823 break;
fa619a77 824 case IB_MGMT_RMPP_TYPE_ABORT:
fe9e08e1 825 process_rmpp_abort(agent, mad_recv_wc);
fa619a77
HR		 826 break;
827 default:
fe9e08e1
SH		 828 abort_send(agent, rmpp_mad->mad_hdr.tid,
829 IB_MGMT_RMPP_STATUS_BADT);
830 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
fa619a77
HR		 831 break;
832 }
833out:
834 ib_free_recv_mad(mad_recv_wc);
835 return NULL;
836}
837
838int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
839{
840 struct ib_rmpp_mad *rmpp_mad;
841 int i, total_len, ret;
842
34816ad9 843 rmpp_mad = mad_send_wr->send_buf.mad;
fa619a77
HR		 844 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
845 IB_MGMT_RMPP_FLAG_ACTIVE))
846 return IB_RMPP_RESULT_UNHANDLED;
847
848 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
849 return IB_RMPP_RESULT_INTERNAL;
850
851 if (mad_send_wr->send_wr.num_sge > 1)
852 return -EINVAL; /* TODO: support num_sge > 1 */
853
854 mad_send_wr->seg_num = 1;
855 mad_send_wr->newwin = 1;
856 mad_send_wr->data_offset = data_offset(rmpp_mad->mad_hdr.mgmt_class);
857
858 total_len = 0;
859 for (i = 0; i < mad_send_wr->send_wr.num_sge; i++)
860 total_len += mad_send_wr->send_wr.sg_list[i].length;
861
862 mad_send_wr->total_seg = (total_len - mad_send_wr->data_offset) /
863 (sizeof(struct ib_rmpp_mad) - mad_send_wr->data_offset);
34816ad9 864 mad_send_wr->pad = total_len - IB_MGMT_RMPP_HDR -
fa619a77
HR		 865 be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
866
867 /* We need to wait for the final ACK even if there isn't a response */
868 mad_send_wr->refcount += (mad_send_wr->timeout == 0);
869 ret = send_next_seg(mad_send_wr);
870 if (!ret)
871 return IB_RMPP_RESULT_CONSUMED;
872 return ret;
873}
874
875int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr,
876 struct ib_mad_send_wc *mad_send_wc)
877{
878 struct ib_rmpp_mad *rmpp_mad;
fa619a77
HR		 879 int ret;
880
34816ad9 881 rmpp_mad = mad_send_wr->send_buf.mad;
fa619a77
HR		 882 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
883 IB_MGMT_RMPP_FLAG_ACTIVE))
884 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
885
34816ad9 886 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
fa619a77 887 return IB_RMPP_RESULT_INTERNAL; /* ACK, STOP, or ABORT */
fa619a77
HR		 888
889 if (mad_send_wc->status != IB_WC_SUCCESS ||
890 mad_send_wr->status != IB_WC_SUCCESS)
891 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */
892
893 if (!mad_send_wr->timeout)
894 return IB_RMPP_RESULT_PROCESSED; /* Response received */
895
896 if (mad_send_wr->last_ack == mad_send_wr->total_seg) {
897 mad_send_wr->timeout =
34816ad9 898 msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
fa619a77
HR		 899 return IB_RMPP_RESULT_PROCESSED; /* Send done */
900 }
901
902 if (mad_send_wr->seg_num > mad_send_wr->newwin ||
903 mad_send_wr->seg_num > mad_send_wr->total_seg)
904 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */
905
906 ret = send_next_seg(mad_send_wr);
907 if (ret) {
908 mad_send_wc->status = IB_WC_GENERAL_ERR;
909 return IB_RMPP_RESULT_PROCESSED;
910 }
911 return IB_RMPP_RESULT_CONSUMED;
912}
913
914int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr)
915{
916 struct ib_rmpp_mad *rmpp_mad;
917 int ret;
918
34816ad9 919 rmpp_mad = mad_send_wr->send_buf.mad;
fa619a77
HR		 920 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
921 IB_MGMT_RMPP_FLAG_ACTIVE))
922 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
923
924 if (mad_send_wr->last_ack == mad_send_wr->total_seg)
925 return IB_RMPP_RESULT_PROCESSED;
926
927 mad_send_wr->seg_num = mad_send_wr->last_ack + 1;
928 ret = send_next_seg(mad_send_wr);
929 if (ret)
930 return IB_RMPP_RESULT_PROCESSED;
931
932 return IB_RMPP_RESULT_CONSUMED;
933}
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