1 /*
2 * Copyright (c) 2005 Intel Inc. All rights reserved.
3 * Copyright (c) 2005-2006 Voltaire, Inc. All rights reserved.
4 * Copyright (c) 2014 Intel Corporation. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 */
34
35 #include <linux/slab.h>
36
37 #include "mad_priv.h"
38 #include "mad_rmpp.h"
39
40 enum rmpp_state {
41 RMPP_STATE_ACTIVE,
42 RMPP_STATE_TIMEOUT,
43 RMPP_STATE_COMPLETE
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 refcount_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 u32 slid;
67 u8 mgmt_class;
68 u8 class_version;
69 u8 method;
70 u8 base_version;
71 };
72
deref_rmpp_recv(struct mad_rmpp_recv * rmpp_recv)73 static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
74 {
75 if (refcount_dec_and_test(&rmpp_recv->refcount))
76 complete(&rmpp_recv->comp);
77 }
78
destroy_rmpp_recv(struct mad_rmpp_recv * rmpp_recv)79 static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
80 {
81 deref_rmpp_recv(rmpp_recv);
82 wait_for_completion(&rmpp_recv->comp);
83 rdma_destroy_ah(rmpp_recv->ah, RDMA_DESTROY_AH_SLEEPABLE);
84 kfree(rmpp_recv);
85 }
86
ib_cancel_rmpp_recvs(struct ib_mad_agent_private * agent)87 void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent)
88 {
89 struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv;
90 unsigned long flags;
91
92 spin_lock_irqsave(&agent->lock, flags);
93 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
94 cancel_delayed_work(&rmpp_recv->timeout_work);
95 cancel_delayed_work(&rmpp_recv->cleanup_work);
96 }
97 spin_unlock_irqrestore(&agent->lock, flags);
98
99 flush_workqueue(agent->qp_info->port_priv->wq);
100
101 list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv,
102 &agent->rmpp_list, list) {
103 list_del(&rmpp_recv->list);
104 if (rmpp_recv->state != RMPP_STATE_COMPLETE)
105 ib_free_recv_mad(rmpp_recv->rmpp_wc);
106 destroy_rmpp_recv(rmpp_recv);
107 }
108 }
109
format_ack(struct ib_mad_send_buf * msg,struct ib_rmpp_mad * data,struct mad_rmpp_recv * rmpp_recv)110 static void format_ack(struct ib_mad_send_buf *msg,
111 struct ib_rmpp_mad *data,
112 struct mad_rmpp_recv *rmpp_recv)
113 {
114 struct ib_rmpp_mad *ack = msg->mad;
115 unsigned long flags;
116
117 memcpy(ack, &data->mad_hdr, msg->hdr_len);
118
119 ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
120 ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK;
121 ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
122
123 spin_lock_irqsave(&rmpp_recv->lock, flags);
124 rmpp_recv->last_ack = rmpp_recv->seg_num;
125 ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num);
126 ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin);
127 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
128 }
129
ack_recv(struct mad_rmpp_recv * rmpp_recv,struct ib_mad_recv_wc * recv_wc)130 static void ack_recv(struct mad_rmpp_recv *rmpp_recv,
131 struct ib_mad_recv_wc *recv_wc)
132 {
133 struct ib_mad_send_buf *msg;
134 int ret, hdr_len;
135
136 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
137 msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp,
138 recv_wc->wc->pkey_index, 1, hdr_len,
139 0, GFP_KERNEL,
140 IB_MGMT_BASE_VERSION);
141 if (IS_ERR(msg))
142 return;
143
144 format_ack(msg, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv);
145 msg->ah = rmpp_recv->ah;
146 ret = ib_post_send_mad(msg, NULL);
147 if (ret)
148 ib_free_send_mad(msg);
149 }
150
alloc_response_msg(struct ib_mad_agent * agent,struct ib_mad_recv_wc * recv_wc)151 static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent,
152 struct ib_mad_recv_wc *recv_wc)
153 {
154 struct ib_mad_send_buf *msg;
155 struct ib_ah *ah;
156 int hdr_len;
157
158 ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc,
159 recv_wc->recv_buf.grh, agent->port_num);
160 if (IS_ERR(ah))
161 return ERR_CAST(ah);
162
163 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
164 msg = ib_create_send_mad(agent, recv_wc->wc->src_qp,
165 recv_wc->wc->pkey_index, 1,
166 hdr_len, 0, GFP_KERNEL,
167 IB_MGMT_BASE_VERSION);
168 if (IS_ERR(msg))
169 rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);
170 else {
171 msg->ah = ah;
172 msg->context[0] = ah;
173 }
174
175 return msg;
176 }
177
ack_ds_ack(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * recv_wc)178 static void ack_ds_ack(struct ib_mad_agent_private *agent,
179 struct ib_mad_recv_wc *recv_wc)
180 {
181 struct ib_mad_send_buf *msg;
182 struct ib_rmpp_mad *rmpp_mad;
183 int ret;
184
185 msg = alloc_response_msg(&agent->agent, recv_wc);
186 if (IS_ERR(msg))
187 return;
188
189 rmpp_mad = msg->mad;
190 memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
191
192 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
193 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
194 rmpp_mad->rmpp_hdr.seg_num = 0;
195 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(1);
196
197 ret = ib_post_send_mad(msg, NULL);
198 if (ret) {
199 rdma_destroy_ah(msg->ah, RDMA_DESTROY_AH_SLEEPABLE);
200 ib_free_send_mad(msg);
201 }
202 }
203
ib_rmpp_send_handler(struct ib_mad_send_wc * mad_send_wc)204 void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc)
205 {
206 if (mad_send_wc->send_buf->context[0] == mad_send_wc->send_buf->ah)
207 rdma_destroy_ah(mad_send_wc->send_buf->ah,
208 RDMA_DESTROY_AH_SLEEPABLE);
209 ib_free_send_mad(mad_send_wc->send_buf);
210 }
211
nack_recv(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * recv_wc,u8 rmpp_status)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 rdma_destroy_ah(msg->ah, RDMA_DESTROY_AH_SLEEPABLE);
237 ib_free_send_mad(msg);
238 }
239 }
240
recv_timeout_handler(struct work_struct * work)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
recv_cleanup_handler(struct work_struct * work)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 list_del(&rmpp_recv->list);
271 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
272 destroy_rmpp_recv(rmpp_recv);
273 }
274
275 static struct mad_rmpp_recv *
create_rmpp_recv(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)276 create_rmpp_recv(struct ib_mad_agent_private *agent,
277 struct ib_mad_recv_wc *mad_recv_wc)
278 {
279 struct mad_rmpp_recv *rmpp_recv;
280 struct ib_mad_hdr *mad_hdr;
281
282 rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL);
283 if (!rmpp_recv)
284 return NULL;
285
286 rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd,
287 mad_recv_wc->wc,
288 mad_recv_wc->recv_buf.grh,
289 agent->agent.port_num);
290 if (IS_ERR(rmpp_recv->ah))
291 goto error;
292
293 rmpp_recv->agent = agent;
294 init_completion(&rmpp_recv->comp);
295 INIT_DELAYED_WORK(&rmpp_recv->timeout_work, recv_timeout_handler);
296 INIT_DELAYED_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler);
297 spin_lock_init(&rmpp_recv->lock);
298 rmpp_recv->state = RMPP_STATE_ACTIVE;
299 refcount_set(&rmpp_recv->refcount, 1);
300
301 rmpp_recv->rmpp_wc = mad_recv_wc;
302 rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf;
303 rmpp_recv->newwin = 1;
304 rmpp_recv->seg_num = 1;
305 rmpp_recv->last_ack = 0;
306 rmpp_recv->repwin = 1;
307
308 mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
309 rmpp_recv->tid = mad_hdr->tid;
310 rmpp_recv->src_qp = mad_recv_wc->wc->src_qp;
311 rmpp_recv->slid = mad_recv_wc->wc->slid;
312 rmpp_recv->mgmt_class = mad_hdr->mgmt_class;
313 rmpp_recv->class_version = mad_hdr->class_version;
314 rmpp_recv->method = mad_hdr->method;
315 rmpp_recv->base_version = mad_hdr->base_version;
316 return rmpp_recv;
317
318 error: kfree(rmpp_recv);
319 return NULL;
320 }
321
322 static struct mad_rmpp_recv *
find_rmpp_recv(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)323 find_rmpp_recv(struct ib_mad_agent_private *agent,
324 struct ib_mad_recv_wc *mad_recv_wc)
325 {
326 struct mad_rmpp_recv *rmpp_recv;
327 struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
328
329 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
330 if (rmpp_recv->tid == mad_hdr->tid &&
331 rmpp_recv->src_qp == mad_recv_wc->wc->src_qp &&
332 rmpp_recv->slid == mad_recv_wc->wc->slid &&
333 rmpp_recv->mgmt_class == mad_hdr->mgmt_class &&
334 rmpp_recv->class_version == mad_hdr->class_version &&
335 rmpp_recv->method == mad_hdr->method)
336 return rmpp_recv;
337 }
338 return NULL;
339 }
340
341 static struct mad_rmpp_recv *
acquire_rmpp_recv(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)342 acquire_rmpp_recv(struct ib_mad_agent_private *agent,
343 struct ib_mad_recv_wc *mad_recv_wc)
344 {
345 struct mad_rmpp_recv *rmpp_recv;
346 unsigned long flags;
347
348 spin_lock_irqsave(&agent->lock, flags);
349 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
350 if (rmpp_recv)
351 refcount_inc(&rmpp_recv->refcount);
352 spin_unlock_irqrestore(&agent->lock, flags);
353 return rmpp_recv;
354 }
355
356 static struct mad_rmpp_recv *
insert_rmpp_recv(struct ib_mad_agent_private * agent,struct mad_rmpp_recv * rmpp_recv)357 insert_rmpp_recv(struct ib_mad_agent_private *agent,
358 struct mad_rmpp_recv *rmpp_recv)
359 {
360 struct mad_rmpp_recv *cur_rmpp_recv;
361
362 cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc);
363 if (!cur_rmpp_recv)
364 list_add_tail(&rmpp_recv->list, &agent->rmpp_list);
365
366 return cur_rmpp_recv;
367 }
368
get_last_flag(struct ib_mad_recv_buf * seg)369 static inline int get_last_flag(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 ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST;
375 }
376
get_seg_num(struct ib_mad_recv_buf * seg)377 static inline int get_seg_num(struct ib_mad_recv_buf *seg)
378 {
379 struct ib_rmpp_mad *rmpp_mad;
380
381 rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
382 return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
383 }
384
get_next_seg(struct list_head * rmpp_list,struct ib_mad_recv_buf * seg)385 static inline struct ib_mad_recv_buf *get_next_seg(struct list_head *rmpp_list,
386 struct ib_mad_recv_buf *seg)
387 {
388 if (seg->list.next == rmpp_list)
389 return NULL;
390
391 return container_of(seg->list.next, struct ib_mad_recv_buf, list);
392 }
393
window_size(struct ib_mad_agent_private * agent)394 static inline int window_size(struct ib_mad_agent_private *agent)
395 {
396 return max(agent->qp_info->recv_queue.max_active >> 3, 1);
397 }
398
find_seg_location(struct list_head * rmpp_list,int seg_num)399 static struct ib_mad_recv_buf *find_seg_location(struct list_head *rmpp_list,
400 int seg_num)
401 {
402 struct ib_mad_recv_buf *seg_buf;
403 int cur_seg_num;
404
405 list_for_each_entry_reverse(seg_buf, rmpp_list, list) {
406 cur_seg_num = get_seg_num(seg_buf);
407 if (seg_num > cur_seg_num)
408 return seg_buf;
409 if (seg_num == cur_seg_num)
410 break;
411 }
412 return NULL;
413 }
414
update_seg_num(struct mad_rmpp_recv * rmpp_recv,struct ib_mad_recv_buf * new_buf)415 static void update_seg_num(struct mad_rmpp_recv *rmpp_recv,
416 struct ib_mad_recv_buf *new_buf)
417 {
418 struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list;
419
420 while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) {
421 rmpp_recv->cur_seg_buf = new_buf;
422 rmpp_recv->seg_num++;
423 new_buf = get_next_seg(rmpp_list, new_buf);
424 }
425 }
426
get_mad_len(struct mad_rmpp_recv * rmpp_recv)427 static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv)
428 {
429 struct ib_rmpp_mad *rmpp_mad;
430 int hdr_size, data_size, pad;
431 bool opa = rdma_cap_opa_mad(rmpp_recv->agent->qp_info->port_priv->device,
432 rmpp_recv->agent->qp_info->port_priv->port_num);
433
434 rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad;
435
436 hdr_size = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
437 if (opa && rmpp_recv->base_version == OPA_MGMT_BASE_VERSION) {
438 data_size = sizeof(struct opa_rmpp_mad) - hdr_size;
439 pad = OPA_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
440 if (pad > OPA_MGMT_RMPP_DATA || pad < 0)
441 pad = 0;
442 } else {
443 data_size = sizeof(struct ib_rmpp_mad) - hdr_size;
444 pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
445 if (pad > IB_MGMT_RMPP_DATA || pad < 0)
446 pad = 0;
447 }
448
449 return hdr_size + rmpp_recv->seg_num * data_size - pad;
450 }
451
complete_rmpp(struct mad_rmpp_recv * rmpp_recv)452 static struct ib_mad_recv_wc *complete_rmpp(struct mad_rmpp_recv *rmpp_recv)
453 {
454 struct ib_mad_recv_wc *rmpp_wc;
455
456 ack_recv(rmpp_recv, rmpp_recv->rmpp_wc);
457 if (rmpp_recv->seg_num > 1)
458 cancel_delayed_work(&rmpp_recv->timeout_work);
459
460 rmpp_wc = rmpp_recv->rmpp_wc;
461 rmpp_wc->mad_len = get_mad_len(rmpp_recv);
462 /* 10 seconds until we can find the packet lifetime */
463 queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq,
464 &rmpp_recv->cleanup_work, msecs_to_jiffies(10000));
465 return rmpp_wc;
466 }
467
468 static struct ib_mad_recv_wc *
continue_rmpp(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)469 continue_rmpp(struct ib_mad_agent_private *agent,
470 struct ib_mad_recv_wc *mad_recv_wc)
471 {
472 struct mad_rmpp_recv *rmpp_recv;
473 struct ib_mad_recv_buf *prev_buf;
474 struct ib_mad_recv_wc *done_wc;
475 int seg_num;
476 unsigned long flags;
477
478 rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc);
479 if (!rmpp_recv)
480 goto drop1;
481
482 seg_num = get_seg_num(&mad_recv_wc->recv_buf);
483
484 spin_lock_irqsave(&rmpp_recv->lock, flags);
485 if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) ||
486 (seg_num > rmpp_recv->newwin))
487 goto drop3;
488
489 if ((seg_num <= rmpp_recv->last_ack) ||
490 (rmpp_recv->state == RMPP_STATE_COMPLETE)) {
491 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
492 ack_recv(rmpp_recv, mad_recv_wc);
493 goto drop2;
494 }
495
496 prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num);
497 if (!prev_buf)
498 goto drop3;
499
500 done_wc = NULL;
501 list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list);
502 if (rmpp_recv->cur_seg_buf == prev_buf) {
503 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf);
504 if (get_last_flag(rmpp_recv->cur_seg_buf)) {
505 rmpp_recv->state = RMPP_STATE_COMPLETE;
506 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
507 done_wc = complete_rmpp(rmpp_recv);
508 goto out;
509 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) {
510 rmpp_recv->newwin += window_size(agent);
511 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
512 ack_recv(rmpp_recv, mad_recv_wc);
513 goto out;
514 }
515 }
516 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
517 out:
518 deref_rmpp_recv(rmpp_recv);
519 return done_wc;
520
521 drop3: spin_unlock_irqrestore(&rmpp_recv->lock, flags);
522 drop2: deref_rmpp_recv(rmpp_recv);
523 drop1: ib_free_recv_mad(mad_recv_wc);
524 return NULL;
525 }
526
527 static struct ib_mad_recv_wc *
start_rmpp(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)528 start_rmpp(struct ib_mad_agent_private *agent,
529 struct ib_mad_recv_wc *mad_recv_wc)
530 {
531 struct mad_rmpp_recv *rmpp_recv;
532 unsigned long flags;
533
534 rmpp_recv = create_rmpp_recv(agent, mad_recv_wc);
535 if (!rmpp_recv) {
536 ib_free_recv_mad(mad_recv_wc);
537 return NULL;
538 }
539
540 spin_lock_irqsave(&agent->lock, flags);
541 if (insert_rmpp_recv(agent, rmpp_recv)) {
542 spin_unlock_irqrestore(&agent->lock, flags);
543 /* duplicate first MAD */
544 destroy_rmpp_recv(rmpp_recv);
545 return continue_rmpp(agent, mad_recv_wc);
546 }
547 refcount_inc(&rmpp_recv->refcount);
548
549 if (get_last_flag(&mad_recv_wc->recv_buf)) {
550 rmpp_recv->state = RMPP_STATE_COMPLETE;
551 spin_unlock_irqrestore(&agent->lock, flags);
552 complete_rmpp(rmpp_recv);
553 } else {
554 spin_unlock_irqrestore(&agent->lock, flags);
555 /* 40 seconds until we can find the packet lifetimes */
556 queue_delayed_work(agent->qp_info->port_priv->wq,
557 &rmpp_recv->timeout_work,
558 msecs_to_jiffies(40000));
559 rmpp_recv->newwin += window_size(agent);
560 ack_recv(rmpp_recv, mad_recv_wc);
561 mad_recv_wc = NULL;
562 }
563 deref_rmpp_recv(rmpp_recv);
564 return mad_recv_wc;
565 }
566
send_next_seg(struct ib_mad_send_wr_private * mad_send_wr)567 static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr)
568 {
569 struct ib_rmpp_mad *rmpp_mad;
570 int timeout;
571 u32 paylen = 0;
572
573 rmpp_mad = mad_send_wr->send_buf.mad;
574 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
575 rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num);
576
577 if (mad_send_wr->seg_num == 1) {
578 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST;
579 paylen = (mad_send_wr->send_buf.seg_count *
580 mad_send_wr->send_buf.seg_rmpp_size) -
581 mad_send_wr->pad;
582 }
583
584 if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) {
585 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST;
586 paylen = mad_send_wr->send_buf.seg_rmpp_size - mad_send_wr->pad;
587 }
588 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
589
590 /* 2 seconds for an ACK until we can find the packet lifetime */
591 timeout = mad_send_wr->send_buf.timeout_ms;
592 if (!timeout || timeout > 2000)
593 mad_send_wr->timeout = msecs_to_jiffies(2000);
594
595 return ib_send_mad(mad_send_wr);
596 }
597
abort_send(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc,u8 rmpp_status)598 static void abort_send(struct ib_mad_agent_private *agent,
599 struct ib_mad_recv_wc *mad_recv_wc, u8 rmpp_status)
600 {
601 struct ib_mad_send_wr_private *mad_send_wr;
602 struct ib_mad_send_wc wc;
603 unsigned long flags;
604
605 spin_lock_irqsave(&agent->lock, flags);
606 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
607 if (!mad_send_wr)
608 goto out; /* Unmatched send */
609
610 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
611 (!mad_send_wr->timeout) ||
612 (mad_send_wr->state == IB_MAD_STATE_CANCELED))
613 goto out; /* Send is already done */
614
615 ib_mark_mad_done(mad_send_wr);
616 if (mad_send_wr->state == IB_MAD_STATE_DONE) {
617 spin_unlock_irqrestore(&agent->lock, flags);
618 wc.status = IB_WC_REM_ABORT_ERR;
619 wc.vendor_err = rmpp_status;
620 wc.send_buf = &mad_send_wr->send_buf;
621 ib_mad_complete_send_wr(mad_send_wr, &wc);
622 return;
623 }
624 spin_unlock_irqrestore(&agent->lock, flags);
625 return;
626 out:
627 spin_unlock_irqrestore(&agent->lock, flags);
628 }
629
adjust_last_ack(struct ib_mad_send_wr_private * wr,int seg_num)630 static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr,
631 int seg_num)
632 {
633 struct list_head *list;
634
635 wr->last_ack = seg_num;
636 list = &wr->last_ack_seg->list;
637 list_for_each_entry(wr->last_ack_seg, list, list)
638 if (wr->last_ack_seg->num == seg_num)
639 break;
640 }
641
process_ds_ack(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc,int newwin)642 static void process_ds_ack(struct ib_mad_agent_private *agent,
643 struct ib_mad_recv_wc *mad_recv_wc, int newwin)
644 {
645 struct mad_rmpp_recv *rmpp_recv;
646
647 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
648 if (rmpp_recv && rmpp_recv->state == RMPP_STATE_COMPLETE)
649 rmpp_recv->repwin = newwin;
650 }
651
process_rmpp_ack(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)652 static void process_rmpp_ack(struct ib_mad_agent_private *agent,
653 struct ib_mad_recv_wc *mad_recv_wc)
654 {
655 struct ib_mad_send_wr_private *mad_send_wr;
656 struct ib_rmpp_mad *rmpp_mad;
657 unsigned long flags;
658 int seg_num, newwin, ret;
659
660 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
661 if (rmpp_mad->rmpp_hdr.rmpp_status) {
662 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
663 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
664 return;
665 }
666
667 seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
668 newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
669 if (newwin < seg_num) {
670 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
671 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
672 return;
673 }
674
675 spin_lock_irqsave(&agent->lock, flags);
676 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
677 if (!mad_send_wr) {
678 if (!seg_num)
679 process_ds_ack(agent, mad_recv_wc, newwin);
680 goto out; /* Unmatched or DS RMPP ACK */
681 }
682
683 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) &&
684 (mad_send_wr->timeout)) {
685 spin_unlock_irqrestore(&agent->lock, flags);
686 ack_ds_ack(agent, mad_recv_wc);
687 return; /* Repeated ACK for DS RMPP transaction */
688 }
689
690 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
691 (!mad_send_wr->timeout) ||
692 (mad_send_wr->state == IB_MAD_STATE_CANCELED))
693 goto out; /* Send is already done */
694
695 if (seg_num > mad_send_wr->send_buf.seg_count ||
696 seg_num > mad_send_wr->newwin) {
697 spin_unlock_irqrestore(&agent->lock, flags);
698 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
699 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
700 return;
701 }
702
703 if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack)
704 goto out; /* Old ACK */
705
706 if (seg_num > mad_send_wr->last_ack) {
707 adjust_last_ack(mad_send_wr, seg_num);
708 mad_send_wr->retries_left = mad_send_wr->max_retries;
709 }
710 mad_send_wr->newwin = newwin;
711 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
712 /* If no response is expected, the ACK completes the send */
713 if (!mad_send_wr->send_buf.timeout_ms) {
714 struct ib_mad_send_wc wc;
715
716 ib_mark_mad_done(mad_send_wr);
717 if (mad_send_wr->state == IB_MAD_STATE_DONE) {
718 spin_unlock_irqrestore(&agent->lock, flags);
719 wc.status = IB_WC_SUCCESS;
720 wc.vendor_err = 0;
721 wc.send_buf = &mad_send_wr->send_buf;
722 ib_mad_complete_send_wr(mad_send_wr, &wc);
723 return;
724 }
725 spin_unlock_irqrestore(&agent->lock, flags);
726 return;
727 }
728 if (mad_send_wr->state == IB_MAD_STATE_WAIT_RESP)
729 ib_reset_mad_timeout(mad_send_wr,
730 mad_send_wr->send_buf.timeout_ms);
731 spin_unlock_irqrestore(&agent->lock, flags);
732 ack_ds_ack(agent, mad_recv_wc);
733 return;
734 } else if (mad_send_wr->state == IB_MAD_STATE_WAIT_RESP &&
735 mad_send_wr->seg_num < mad_send_wr->newwin &&
736 mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) {
737 /* Send failure will just result in a timeout/retry */
738 ret = send_next_seg(mad_send_wr);
739 if (ret)
740 goto out;
741
742 change_mad_state(mad_send_wr, IB_MAD_STATE_SEND_START);
743 list_move_tail(&mad_send_wr->agent_list,
744 &mad_send_wr->mad_agent_priv->send_list);
745 }
746 out:
747 spin_unlock_irqrestore(&agent->lock, flags);
748 }
749
750 static struct ib_mad_recv_wc *
process_rmpp_data(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)751 process_rmpp_data(struct ib_mad_agent_private *agent,
752 struct ib_mad_recv_wc *mad_recv_wc)
753 {
754 struct ib_rmpp_hdr *rmpp_hdr;
755 u8 rmpp_status;
756
757 rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr;
758
759 if (rmpp_hdr->rmpp_status) {
760 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS;
761 goto bad;
762 }
763
764 if (rmpp_hdr->seg_num == cpu_to_be32(1)) {
765 if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) {
766 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
767 goto bad;
768 }
769 return start_rmpp(agent, mad_recv_wc);
770 } else {
771 if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) {
772 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
773 goto bad;
774 }
775 return continue_rmpp(agent, mad_recv_wc);
776 }
777 bad:
778 nack_recv(agent, mad_recv_wc, rmpp_status);
779 ib_free_recv_mad(mad_recv_wc);
780 return NULL;
781 }
782
process_rmpp_stop(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)783 static void process_rmpp_stop(struct ib_mad_agent_private *agent,
784 struct ib_mad_recv_wc *mad_recv_wc)
785 {
786 struct ib_rmpp_mad *rmpp_mad;
787
788 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
789
790 if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) {
791 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
792 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
793 } else
794 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
795 }
796
process_rmpp_abort(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)797 static void process_rmpp_abort(struct ib_mad_agent_private *agent,
798 struct ib_mad_recv_wc *mad_recv_wc)
799 {
800 struct ib_rmpp_mad *rmpp_mad;
801
802 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
803
804 if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN ||
805 rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) {
806 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
807 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
808 } else
809 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
810 }
811
812 struct ib_mad_recv_wc *
ib_process_rmpp_recv_wc(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)813 ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent,
814 struct ib_mad_recv_wc *mad_recv_wc)
815 {
816 struct ib_rmpp_mad *rmpp_mad;
817
818 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
819 if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE))
820 return mad_recv_wc;
821
822 if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) {
823 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
824 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
825 goto out;
826 }
827
828 switch (rmpp_mad->rmpp_hdr.rmpp_type) {
829 case IB_MGMT_RMPP_TYPE_DATA:
830 return process_rmpp_data(agent, mad_recv_wc);
831 case IB_MGMT_RMPP_TYPE_ACK:
832 process_rmpp_ack(agent, mad_recv_wc);
833 break;
834 case IB_MGMT_RMPP_TYPE_STOP:
835 process_rmpp_stop(agent, mad_recv_wc);
836 break;
837 case IB_MGMT_RMPP_TYPE_ABORT:
838 process_rmpp_abort(agent, mad_recv_wc);
839 break;
840 default:
841 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
842 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
843 break;
844 }
845 out:
846 ib_free_recv_mad(mad_recv_wc);
847 return NULL;
848 }
849
init_newwin(struct ib_mad_send_wr_private * mad_send_wr)850 static int init_newwin(struct ib_mad_send_wr_private *mad_send_wr)
851 {
852 struct ib_mad_agent_private *agent = mad_send_wr->mad_agent_priv;
853 struct ib_mad_hdr *mad_hdr = mad_send_wr->send_buf.mad;
854 struct mad_rmpp_recv *rmpp_recv;
855 struct rdma_ah_attr ah_attr;
856 unsigned long flags;
857 int newwin = 1;
858
859 if (!(mad_hdr->method & IB_MGMT_METHOD_RESP))
860 goto out;
861
862 spin_lock_irqsave(&agent->lock, flags);
863 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
864 if (rmpp_recv->tid != mad_hdr->tid ||
865 rmpp_recv->mgmt_class != mad_hdr->mgmt_class ||
866 rmpp_recv->class_version != mad_hdr->class_version ||
867 (rmpp_recv->method & IB_MGMT_METHOD_RESP))
868 continue;
869
870 if (rdma_query_ah(mad_send_wr->send_buf.ah, &ah_attr))
871 continue;
872
873 if (rmpp_recv->slid == rdma_ah_get_dlid(&ah_attr)) {
874 newwin = rmpp_recv->repwin;
875 break;
876 }
877 }
878 spin_unlock_irqrestore(&agent->lock, flags);
879 out:
880 return newwin;
881 }
882
ib_send_rmpp_mad(struct ib_mad_send_wr_private * mad_send_wr)883 int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
884 {
885 struct ib_rmpp_mad *rmpp_mad;
886 int ret;
887
888 rmpp_mad = mad_send_wr->send_buf.mad;
889 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
890 IB_MGMT_RMPP_FLAG_ACTIVE))
891 return IB_RMPP_RESULT_UNHANDLED;
892
893 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) {
894 mad_send_wr->seg_num = 1;
895 return IB_RMPP_RESULT_INTERNAL;
896 }
897
898 mad_send_wr->newwin = init_newwin(mad_send_wr);
899
900 /* We need to wait for the final ACK even if there isn't a response */
901 ret = send_next_seg(mad_send_wr);
902 if (!ret)
903 return IB_RMPP_RESULT_CONSUMED;
904 return ret;
905 }
906
ib_process_rmpp_send_wc(struct ib_mad_send_wr_private * mad_send_wr,struct ib_mad_send_wc * mad_send_wc)907 int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr,
908 struct ib_mad_send_wc *mad_send_wc)
909 {
910 struct ib_rmpp_mad *rmpp_mad;
911 int ret;
912
913 rmpp_mad = mad_send_wr->send_buf.mad;
914 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
915 IB_MGMT_RMPP_FLAG_ACTIVE))
916 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
917
918 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
919 return IB_RMPP_RESULT_INTERNAL; /* ACK, STOP, or ABORT */
920
921 if (mad_send_wc->status != IB_WC_SUCCESS ||
922 mad_send_wr->state == IB_MAD_STATE_CANCELED)
923 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */
924
925 if (!mad_send_wr->timeout)
926 return IB_RMPP_RESULT_PROCESSED; /* Response received */
927
928 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
929 mad_send_wr->timeout =
930 msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
931 return IB_RMPP_RESULT_PROCESSED; /* Send done */
932 }
933
934 if (mad_send_wr->seg_num == mad_send_wr->newwin ||
935 mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count)
936 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */
937
938 ret = send_next_seg(mad_send_wr);
939 if (ret) {
940 mad_send_wc->status = IB_WC_GENERAL_ERR;
941 return IB_RMPP_RESULT_PROCESSED;
942 }
943 return IB_RMPP_RESULT_CONSUMED;
944 }
945
ib_retry_rmpp(struct ib_mad_send_wr_private * mad_send_wr)946 int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr)
947 {
948 struct ib_rmpp_mad *rmpp_mad;
949 int ret;
950
951 rmpp_mad = mad_send_wr->send_buf.mad;
952 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
953 IB_MGMT_RMPP_FLAG_ACTIVE))
954 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
955
956 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count)
957 return IB_RMPP_RESULT_PROCESSED;
958
959 mad_send_wr->seg_num = mad_send_wr->last_ack;
960 mad_send_wr->cur_seg = mad_send_wr->last_ack_seg;
961
962 ret = send_next_seg(mad_send_wr);
963 if (ret)
964 return IB_RMPP_RESULT_PROCESSED;
965
966 return IB_RMPP_RESULT_CONSUMED;
967 }
968