1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
3 *
4 * Copyright (c) 2005 Intel Inc. All rights reserved.
5 * Copyright (c) 2005-2006 Voltaire, Inc. All rights reserved.
6 * Copyright (c) 2014 Intel Corporation. All rights reserved.
7 *
8 * This software is available to you under a choice of one of two
9 * licenses. You may choose to be licensed under the terms of the GNU
10 * General Public License (GPL) Version 2, available from the file
11 * COPYING in the main directory of this source tree, or the
12 * OpenIB.org BSD license below:
13 *
14 * Redistribution and use in source and binary forms, with or
15 * without modification, are permitted provided that the following
16 * conditions are met:
17 *
18 * - Redistributions of source code must retain the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer.
21 *
22 * - Redistributions in binary form must reproduce the above
23 * copyright notice, this list of conditions and the following
24 * disclaimer in the documentation and/or other materials
25 * provided with the distribution.
26 *
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
28 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
29 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
30 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
31 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
32 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
33 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 * SOFTWARE.
35 */
36
37 #include <sys/cdefs.h>
38 #include <linux/slab.h>
39
40 #include "mad_priv.h"
41 #include "mad_rmpp.h"
42
43 enum rmpp_state {
44 RMPP_STATE_ACTIVE,
45 RMPP_STATE_TIMEOUT,
46 RMPP_STATE_COMPLETE,
47 RMPP_STATE_CANCELING
48 };
49
50 struct mad_rmpp_recv {
51 struct ib_mad_agent_private *agent;
52 struct list_head list;
53 struct delayed_work timeout_work;
54 struct delayed_work cleanup_work;
55 struct completion comp;
56 enum rmpp_state state;
57 spinlock_t lock;
58 atomic_t refcount;
59
60 struct ib_ah *ah;
61 struct ib_mad_recv_wc *rmpp_wc;
62 struct ib_mad_recv_buf *cur_seg_buf;
63 int last_ack;
64 int seg_num;
65 int newwin;
66 int repwin;
67
68 __be64 tid;
69 u32 src_qp;
70 u16 slid;
71 u8 mgmt_class;
72 u8 class_version;
73 u8 method;
74 u8 base_version;
75 };
76
deref_rmpp_recv(struct mad_rmpp_recv * rmpp_recv)77 static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
78 {
79 if (atomic_dec_and_test(&rmpp_recv->refcount))
80 complete(&rmpp_recv->comp);
81 }
82
destroy_rmpp_recv(struct mad_rmpp_recv * rmpp_recv)83 static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
84 {
85 deref_rmpp_recv(rmpp_recv);
86 wait_for_completion(&rmpp_recv->comp);
87 ib_destroy_ah(rmpp_recv->ah, RDMA_DESTROY_AH_SLEEPABLE);
88 kfree(rmpp_recv);
89 }
90
ib_cancel_rmpp_recvs(struct ib_mad_agent_private * agent)91 void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent)
92 {
93 struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv;
94 unsigned long flags;
95
96 spin_lock_irqsave(&agent->lock, flags);
97 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
98 if (rmpp_recv->state != RMPP_STATE_COMPLETE)
99 ib_free_recv_mad(rmpp_recv->rmpp_wc);
100 rmpp_recv->state = RMPP_STATE_CANCELING;
101 }
102 spin_unlock_irqrestore(&agent->lock, flags);
103
104 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
105 cancel_delayed_work_sync(&rmpp_recv->timeout_work);
106 cancel_delayed_work_sync(&rmpp_recv->cleanup_work);
107 }
108
109 flush_workqueue(agent->qp_info->port_priv->wq);
110
111 list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv,
112 &agent->rmpp_list, list) {
113 list_del(&rmpp_recv->list);
114 destroy_rmpp_recv(rmpp_recv);
115 }
116 }
117
format_ack(struct ib_mad_send_buf * msg,struct ib_rmpp_mad * data,struct mad_rmpp_recv * rmpp_recv)118 static void format_ack(struct ib_mad_send_buf *msg,
119 struct ib_rmpp_mad *data,
120 struct mad_rmpp_recv *rmpp_recv)
121 {
122 struct ib_rmpp_mad *ack = msg->mad;
123 unsigned long flags;
124
125 memcpy(ack, &data->mad_hdr, msg->hdr_len);
126
127 ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
128 ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK;
129 ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
130
131 spin_lock_irqsave(&rmpp_recv->lock, flags);
132 rmpp_recv->last_ack = rmpp_recv->seg_num;
133 ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num);
134 ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin);
135 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
136 }
137
ack_recv(struct mad_rmpp_recv * rmpp_recv,struct ib_mad_recv_wc * recv_wc)138 static void ack_recv(struct mad_rmpp_recv *rmpp_recv,
139 struct ib_mad_recv_wc *recv_wc)
140 {
141 struct ib_mad_send_buf *msg;
142 int ret, hdr_len;
143
144 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
145 msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp,
146 recv_wc->wc->pkey_index, 1, hdr_len,
147 0, GFP_KERNEL,
148 IB_MGMT_BASE_VERSION);
149 if (IS_ERR(msg))
150 return;
151
152 format_ack(msg, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv);
153 msg->ah = rmpp_recv->ah;
154 ret = ib_post_send_mad(msg, NULL);
155 if (ret)
156 ib_free_send_mad(msg);
157 }
158
alloc_response_msg(struct ib_mad_agent * agent,struct ib_mad_recv_wc * recv_wc)159 static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent,
160 struct ib_mad_recv_wc *recv_wc)
161 {
162 struct ib_mad_send_buf *msg;
163 struct ib_ah *ah;
164 int hdr_len;
165
166 ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc,
167 recv_wc->recv_buf.grh, agent->port_num);
168 if (IS_ERR(ah))
169 return (void *) ah;
170
171 hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
172 msg = ib_create_send_mad(agent, recv_wc->wc->src_qp,
173 recv_wc->wc->pkey_index, 1,
174 hdr_len, 0, GFP_KERNEL,
175 IB_MGMT_BASE_VERSION);
176 if (IS_ERR(msg))
177 ib_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);
178 else {
179 msg->ah = ah;
180 msg->context[0] = ah;
181 }
182
183 return msg;
184 }
185
ack_ds_ack(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * recv_wc)186 static void ack_ds_ack(struct ib_mad_agent_private *agent,
187 struct ib_mad_recv_wc *recv_wc)
188 {
189 struct ib_mad_send_buf *msg;
190 struct ib_rmpp_mad *rmpp_mad;
191 int ret;
192
193 msg = alloc_response_msg(&agent->agent, recv_wc);
194 if (IS_ERR(msg))
195 return;
196
197 rmpp_mad = msg->mad;
198 memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
199
200 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
201 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
202 rmpp_mad->rmpp_hdr.seg_num = 0;
203 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(1);
204
205 ret = ib_post_send_mad(msg, NULL);
206 if (ret) {
207 ib_destroy_ah(msg->ah, RDMA_DESTROY_AH_SLEEPABLE);
208 ib_free_send_mad(msg);
209 }
210 }
211
ib_rmpp_send_handler(struct ib_mad_send_wc * mad_send_wc)212 void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc)
213 {
214 if (mad_send_wc->send_buf->context[0] == mad_send_wc->send_buf->ah)
215 ib_destroy_ah(mad_send_wc->send_buf->ah, RDMA_DESTROY_AH_SLEEPABLE);
216 ib_free_send_mad(mad_send_wc->send_buf);
217 }
218
nack_recv(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * recv_wc,u8 rmpp_status)219 static void nack_recv(struct ib_mad_agent_private *agent,
220 struct ib_mad_recv_wc *recv_wc, u8 rmpp_status)
221 {
222 struct ib_mad_send_buf *msg;
223 struct ib_rmpp_mad *rmpp_mad;
224 int ret;
225
226 msg = alloc_response_msg(&agent->agent, recv_wc);
227 if (IS_ERR(msg))
228 return;
229
230 rmpp_mad = msg->mad;
231 memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
232
233 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
234 rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION;
235 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ABORT;
236 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
237 rmpp_mad->rmpp_hdr.rmpp_status = rmpp_status;
238 rmpp_mad->rmpp_hdr.seg_num = 0;
239 rmpp_mad->rmpp_hdr.paylen_newwin = 0;
240
241 ret = ib_post_send_mad(msg, NULL);
242 if (ret) {
243 ib_destroy_ah(msg->ah, RDMA_DESTROY_AH_SLEEPABLE);
244 ib_free_send_mad(msg);
245 }
246 }
247
recv_timeout_handler(struct work_struct * work)248 static void recv_timeout_handler(struct work_struct *work)
249 {
250 struct mad_rmpp_recv *rmpp_recv =
251 container_of(work, struct mad_rmpp_recv, timeout_work.work);
252 struct ib_mad_recv_wc *rmpp_wc;
253 unsigned long flags;
254
255 spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
256 if (rmpp_recv->state != RMPP_STATE_ACTIVE) {
257 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
258 return;
259 }
260 rmpp_recv->state = RMPP_STATE_TIMEOUT;
261 list_del(&rmpp_recv->list);
262 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
263
264 rmpp_wc = rmpp_recv->rmpp_wc;
265 nack_recv(rmpp_recv->agent, rmpp_wc, IB_MGMT_RMPP_STATUS_T2L);
266 destroy_rmpp_recv(rmpp_recv);
267 ib_free_recv_mad(rmpp_wc);
268 }
269
recv_cleanup_handler(struct work_struct * work)270 static void recv_cleanup_handler(struct work_struct *work)
271 {
272 struct mad_rmpp_recv *rmpp_recv =
273 container_of(work, struct mad_rmpp_recv, cleanup_work.work);
274 unsigned long flags;
275
276 spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
277 if (rmpp_recv->state == RMPP_STATE_CANCELING) {
278 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
279 return;
280 }
281 list_del(&rmpp_recv->list);
282 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
283 destroy_rmpp_recv(rmpp_recv);
284 }
285
286 static struct mad_rmpp_recv *
create_rmpp_recv(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)287 create_rmpp_recv(struct ib_mad_agent_private *agent,
288 struct ib_mad_recv_wc *mad_recv_wc)
289 {
290 struct mad_rmpp_recv *rmpp_recv;
291 struct ib_mad_hdr *mad_hdr;
292
293 rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL);
294 if (!rmpp_recv)
295 return NULL;
296
297 rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd,
298 mad_recv_wc->wc,
299 mad_recv_wc->recv_buf.grh,
300 agent->agent.port_num);
301 if (IS_ERR(rmpp_recv->ah))
302 goto error;
303
304 rmpp_recv->agent = agent;
305 init_completion(&rmpp_recv->comp);
306 INIT_DELAYED_WORK(&rmpp_recv->timeout_work, recv_timeout_handler);
307 INIT_DELAYED_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler);
308 spin_lock_init(&rmpp_recv->lock);
309 rmpp_recv->state = RMPP_STATE_ACTIVE;
310 atomic_set(&rmpp_recv->refcount, 1);
311
312 rmpp_recv->rmpp_wc = mad_recv_wc;
313 rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf;
314 rmpp_recv->newwin = 1;
315 rmpp_recv->seg_num = 1;
316 rmpp_recv->last_ack = 0;
317 rmpp_recv->repwin = 1;
318
319 mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
320 rmpp_recv->tid = mad_hdr->tid;
321 rmpp_recv->src_qp = mad_recv_wc->wc->src_qp;
322 rmpp_recv->slid = mad_recv_wc->wc->slid;
323 rmpp_recv->mgmt_class = mad_hdr->mgmt_class;
324 rmpp_recv->class_version = mad_hdr->class_version;
325 rmpp_recv->method = mad_hdr->method;
326 rmpp_recv->base_version = mad_hdr->base_version;
327 return rmpp_recv;
328
329 error: kfree(rmpp_recv);
330 return NULL;
331 }
332
333 static struct mad_rmpp_recv *
find_rmpp_recv(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)334 find_rmpp_recv(struct ib_mad_agent_private *agent,
335 struct ib_mad_recv_wc *mad_recv_wc)
336 {
337 struct mad_rmpp_recv *rmpp_recv;
338 struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
339
340 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
341 if (rmpp_recv->tid == mad_hdr->tid &&
342 rmpp_recv->src_qp == mad_recv_wc->wc->src_qp &&
343 rmpp_recv->slid == mad_recv_wc->wc->slid &&
344 rmpp_recv->mgmt_class == mad_hdr->mgmt_class &&
345 rmpp_recv->class_version == mad_hdr->class_version &&
346 rmpp_recv->method == mad_hdr->method)
347 return rmpp_recv;
348 }
349 return NULL;
350 }
351
352 static struct mad_rmpp_recv *
acquire_rmpp_recv(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)353 acquire_rmpp_recv(struct ib_mad_agent_private *agent,
354 struct ib_mad_recv_wc *mad_recv_wc)
355 {
356 struct mad_rmpp_recv *rmpp_recv;
357 unsigned long flags;
358
359 spin_lock_irqsave(&agent->lock, flags);
360 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
361 if (rmpp_recv)
362 atomic_inc(&rmpp_recv->refcount);
363 spin_unlock_irqrestore(&agent->lock, flags);
364 return rmpp_recv;
365 }
366
367 static struct mad_rmpp_recv *
insert_rmpp_recv(struct ib_mad_agent_private * agent,struct mad_rmpp_recv * rmpp_recv)368 insert_rmpp_recv(struct ib_mad_agent_private *agent,
369 struct mad_rmpp_recv *rmpp_recv)
370 {
371 struct mad_rmpp_recv *cur_rmpp_recv;
372
373 cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc);
374 if (!cur_rmpp_recv)
375 list_add_tail(&rmpp_recv->list, &agent->rmpp_list);
376
377 return cur_rmpp_recv;
378 }
379
get_last_flag(struct ib_mad_recv_buf * seg)380 static inline int get_last_flag(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 ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST;
386 }
387
get_seg_num(struct ib_mad_recv_buf * seg)388 static inline int get_seg_num(struct ib_mad_recv_buf *seg)
389 {
390 struct ib_rmpp_mad *rmpp_mad;
391
392 rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
393 return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
394 }
395
get_next_seg(struct list_head * rmpp_list,struct ib_mad_recv_buf * seg)396 static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list,
397 struct ib_mad_recv_buf *seg)
398 {
399 if (seg->list.next == rmpp_list)
400 return NULL;
401
402 return container_of(seg->list.next, struct ib_mad_recv_buf, list);
403 }
404
window_size(struct ib_mad_agent_private * agent)405 static inline int window_size(struct ib_mad_agent_private *agent)
406 {
407 return max(agent->qp_info->recv_queue.max_active >> 3, 1);
408 }
409
find_seg_location(struct list_head * rmpp_list,int seg_num)410 static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list,
411 int seg_num)
412 {
413 struct ib_mad_recv_buf *seg_buf;
414 int cur_seg_num;
415
416 list_for_each_entry_reverse(seg_buf, rmpp_list, list) {
417 cur_seg_num = get_seg_num(seg_buf);
418 if (seg_num > cur_seg_num)
419 return seg_buf;
420 if (seg_num == cur_seg_num)
421 break;
422 }
423 return NULL;
424 }
425
update_seg_num(struct mad_rmpp_recv * rmpp_recv,struct ib_mad_recv_buf * new_buf)426 static void update_seg_num(struct mad_rmpp_recv *rmpp_recv,
427 struct ib_mad_recv_buf *new_buf)
428 {
429 struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list;
430
431 while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) {
432 rmpp_recv->cur_seg_buf = new_buf;
433 rmpp_recv->seg_num++;
434 new_buf = get_next_seg(rmpp_list, new_buf);
435 }
436 }
437
get_mad_len(struct mad_rmpp_recv * rmpp_recv)438 static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv)
439 {
440 struct ib_rmpp_mad *rmpp_mad;
441 int hdr_size, data_size, pad;
442 bool opa = rdma_cap_opa_mad(rmpp_recv->agent->qp_info->port_priv->device,
443 rmpp_recv->agent->qp_info->port_priv->port_num);
444
445 rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad;
446
447 hdr_size = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
448 if (opa && rmpp_recv->base_version == OPA_MGMT_BASE_VERSION) {
449 data_size = sizeof(struct opa_rmpp_mad) - hdr_size;
450 pad = OPA_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
451 if (pad > OPA_MGMT_RMPP_DATA || pad < 0)
452 pad = 0;
453 } else {
454 data_size = sizeof(struct ib_rmpp_mad) - hdr_size;
455 pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
456 if (pad > IB_MGMT_RMPP_DATA || pad < 0)
457 pad = 0;
458 }
459
460 return hdr_size + rmpp_recv->seg_num * data_size - pad;
461 }
462
complete_rmpp(struct mad_rmpp_recv * rmpp_recv)463 static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv)
464 {
465 struct ib_mad_recv_wc *rmpp_wc;
466
467 ack_recv(rmpp_recv, rmpp_recv->rmpp_wc);
468 if (rmpp_recv->seg_num > 1)
469 cancel_delayed_work(&rmpp_recv->timeout_work);
470
471 rmpp_wc = rmpp_recv->rmpp_wc;
472 rmpp_wc->mad_len = get_mad_len(rmpp_recv);
473 /* 10 seconds until we can find the packet lifetime */
474 queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq,
475 &rmpp_recv->cleanup_work, msecs_to_jiffies(10000));
476 return rmpp_wc;
477 }
478
479 static struct ib_mad_recv_wc *
continue_rmpp(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)480 continue_rmpp(struct ib_mad_agent_private *agent,
481 struct ib_mad_recv_wc *mad_recv_wc)
482 {
483 struct mad_rmpp_recv *rmpp_recv;
484 struct ib_mad_recv_buf *prev_buf;
485 struct ib_mad_recv_wc *done_wc;
486 int seg_num;
487 unsigned long flags;
488
489 rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc);
490 if (!rmpp_recv)
491 goto drop1;
492
493 seg_num = get_seg_num(&mad_recv_wc->recv_buf);
494
495 spin_lock_irqsave(&rmpp_recv->lock, flags);
496 if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) ||
497 (seg_num > rmpp_recv->newwin))
498 goto drop3;
499
500 if ((seg_num <= rmpp_recv->last_ack) ||
501 (rmpp_recv->state == RMPP_STATE_COMPLETE)) {
502 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
503 ack_recv(rmpp_recv, mad_recv_wc);
504 goto drop2;
505 }
506
507 prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num);
508 if (!prev_buf)
509 goto drop3;
510
511 done_wc = NULL;
512 list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list);
513 if (rmpp_recv->cur_seg_buf == prev_buf) {
514 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf);
515 if (get_last_flag(rmpp_recv->cur_seg_buf)) {
516 rmpp_recv->state = RMPP_STATE_COMPLETE;
517 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
518 done_wc = complete_rmpp(rmpp_recv);
519 goto out;
520 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) {
521 rmpp_recv->newwin += window_size(agent);
522 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
523 ack_recv(rmpp_recv, mad_recv_wc);
524 goto out;
525 }
526 }
527 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
528 out:
529 deref_rmpp_recv(rmpp_recv);
530 return done_wc;
531
532 drop3: spin_unlock_irqrestore(&rmpp_recv->lock, flags);
533 drop2: deref_rmpp_recv(rmpp_recv);
534 drop1: ib_free_recv_mad(mad_recv_wc);
535 return NULL;
536 }
537
538 static struct ib_mad_recv_wc *
start_rmpp(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)539 start_rmpp(struct ib_mad_agent_private *agent,
540 struct ib_mad_recv_wc *mad_recv_wc)
541 {
542 struct mad_rmpp_recv *rmpp_recv;
543 unsigned long flags;
544
545 rmpp_recv = create_rmpp_recv(agent, mad_recv_wc);
546 if (!rmpp_recv) {
547 ib_free_recv_mad(mad_recv_wc);
548 return NULL;
549 }
550
551 spin_lock_irqsave(&agent->lock, flags);
552 if (insert_rmpp_recv(agent, rmpp_recv)) {
553 spin_unlock_irqrestore(&agent->lock, flags);
554 /* duplicate first MAD */
555 destroy_rmpp_recv(rmpp_recv);
556 return continue_rmpp(agent, mad_recv_wc);
557 }
558 atomic_inc(&rmpp_recv->refcount);
559
560 if (get_last_flag(&mad_recv_wc->recv_buf)) {
561 rmpp_recv->state = RMPP_STATE_COMPLETE;
562 spin_unlock_irqrestore(&agent->lock, flags);
563 complete_rmpp(rmpp_recv);
564 } else {
565 spin_unlock_irqrestore(&agent->lock, flags);
566 /* 40 seconds until we can find the packet lifetimes */
567 queue_delayed_work(agent->qp_info->port_priv->wq,
568 &rmpp_recv->timeout_work,
569 msecs_to_jiffies(40000));
570 rmpp_recv->newwin += window_size(agent);
571 ack_recv(rmpp_recv, mad_recv_wc);
572 mad_recv_wc = NULL;
573 }
574 deref_rmpp_recv(rmpp_recv);
575 return mad_recv_wc;
576 }
577
send_next_seg(struct ib_mad_send_wr_private * mad_send_wr)578 static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr)
579 {
580 struct ib_rmpp_mad *rmpp_mad;
581 int timeout;
582 u32 paylen = 0;
583
584 rmpp_mad = mad_send_wr->send_buf.mad;
585 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
586 rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num);
587
588 if (mad_send_wr->seg_num == 1) {
589 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST;
590 paylen = (mad_send_wr->send_buf.seg_count *
591 mad_send_wr->send_buf.seg_rmpp_size) -
592 mad_send_wr->pad;
593 }
594
595 if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) {
596 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST;
597 paylen = mad_send_wr->send_buf.seg_rmpp_size - mad_send_wr->pad;
598 }
599 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
600
601 /* 2 seconds for an ACK until we can find the packet lifetime */
602 timeout = mad_send_wr->send_buf.timeout_ms;
603 if (!timeout || timeout > 2000)
604 mad_send_wr->timeout = msecs_to_jiffies(2000);
605
606 return ib_send_mad(mad_send_wr);
607 }
608
abort_send(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc,u8 rmpp_status)609 static void abort_send(struct ib_mad_agent_private *agent,
610 struct ib_mad_recv_wc *mad_recv_wc, u8 rmpp_status)
611 {
612 struct ib_mad_send_wr_private *mad_send_wr;
613 struct ib_mad_send_wc wc;
614 unsigned long flags;
615
616 spin_lock_irqsave(&agent->lock, flags);
617 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
618 if (!mad_send_wr)
619 goto out; /* Unmatched send */
620
621 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
622 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
623 goto out; /* Send is already done */
624
625 ib_mark_mad_done(mad_send_wr);
626 spin_unlock_irqrestore(&agent->lock, flags);
627
628 wc.status = IB_WC_REM_ABORT_ERR;
629 wc.vendor_err = rmpp_status;
630 wc.send_buf = &mad_send_wr->send_buf;
631 ib_mad_complete_send_wr(mad_send_wr, &wc);
632 return;
633 out:
634 spin_unlock_irqrestore(&agent->lock, flags);
635 }
636
adjust_last_ack(struct ib_mad_send_wr_private * wr,int seg_num)637 static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr,
638 int seg_num)
639 {
640 struct list_head *list;
641
642 wr->last_ack = seg_num;
643 list = &wr->last_ack_seg->list;
644 list_for_each_entry(wr->last_ack_seg, list, list)
645 if (wr->last_ack_seg->num == seg_num)
646 break;
647 }
648
process_ds_ack(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc,int newwin)649 static void process_ds_ack(struct ib_mad_agent_private *agent,
650 struct ib_mad_recv_wc *mad_recv_wc, int newwin)
651 {
652 struct mad_rmpp_recv *rmpp_recv;
653
654 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
655 if (rmpp_recv && rmpp_recv->state == RMPP_STATE_COMPLETE)
656 rmpp_recv->repwin = newwin;
657 }
658
process_rmpp_ack(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)659 static void process_rmpp_ack(struct ib_mad_agent_private *agent,
660 struct ib_mad_recv_wc *mad_recv_wc)
661 {
662 struct ib_mad_send_wr_private *mad_send_wr;
663 struct ib_rmpp_mad *rmpp_mad;
664 unsigned long flags;
665 int seg_num, newwin, ret;
666
667 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
668 if (rmpp_mad->rmpp_hdr.rmpp_status) {
669 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
670 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
671 return;
672 }
673
674 seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
675 newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
676 if (newwin < seg_num) {
677 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
678 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
679 return;
680 }
681
682 spin_lock_irqsave(&agent->lock, flags);
683 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
684 if (!mad_send_wr) {
685 if (!seg_num)
686 process_ds_ack(agent, mad_recv_wc, newwin);
687 goto out; /* Unmatched or DS RMPP ACK */
688 }
689
690 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) &&
691 (mad_send_wr->timeout)) {
692 spin_unlock_irqrestore(&agent->lock, flags);
693 ack_ds_ack(agent, mad_recv_wc);
694 return; /* Repeated ACK for DS RMPP transaction */
695 }
696
697 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
698 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
699 goto out; /* Send is already done */
700
701 if (seg_num > mad_send_wr->send_buf.seg_count ||
702 seg_num > mad_send_wr->newwin) {
703 spin_unlock_irqrestore(&agent->lock, flags);
704 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
705 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
706 return;
707 }
708
709 if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack)
710 goto out; /* Old ACK */
711
712 if (seg_num > mad_send_wr->last_ack) {
713 adjust_last_ack(mad_send_wr, seg_num);
714 mad_send_wr->retries_left = mad_send_wr->max_retries;
715 }
716 mad_send_wr->newwin = newwin;
717 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
718 /* If no response is expected, the ACK completes the send */
719 if (!mad_send_wr->send_buf.timeout_ms) {
720 struct ib_mad_send_wc wc;
721
722 ib_mark_mad_done(mad_send_wr);
723 spin_unlock_irqrestore(&agent->lock, flags);
724
725 wc.status = IB_WC_SUCCESS;
726 wc.vendor_err = 0;
727 wc.send_buf = &mad_send_wr->send_buf;
728 ib_mad_complete_send_wr(mad_send_wr, &wc);
729 return;
730 }
731 if (mad_send_wr->refcount == 1)
732 ib_reset_mad_timeout(mad_send_wr,
733 mad_send_wr->send_buf.timeout_ms);
734 spin_unlock_irqrestore(&agent->lock, flags);
735 ack_ds_ack(agent, mad_recv_wc);
736 return;
737 } else if (mad_send_wr->refcount == 1 &&
738 mad_send_wr->seg_num < mad_send_wr->newwin &&
739 mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) {
740 /* Send failure will just result in a timeout/retry */
741 ret = send_next_seg(mad_send_wr);
742 if (ret)
743 goto out;
744
745 mad_send_wr->refcount++;
746 list_move_tail(&mad_send_wr->agent_list,
747 &mad_send_wr->mad_agent_priv->send_list);
748 }
749 out:
750 spin_unlock_irqrestore(&agent->lock, flags);
751 }
752
753 static struct ib_mad_recv_wc *
process_rmpp_data(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)754 process_rmpp_data(struct ib_mad_agent_private *agent,
755 struct ib_mad_recv_wc *mad_recv_wc)
756 {
757 struct ib_rmpp_hdr *rmpp_hdr;
758 u8 rmpp_status;
759
760 rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr;
761
762 if (rmpp_hdr->rmpp_status) {
763 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS;
764 goto bad;
765 }
766
767 if (rmpp_hdr->seg_num == cpu_to_be32(1)) {
768 if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) {
769 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
770 goto bad;
771 }
772 return start_rmpp(agent, mad_recv_wc);
773 } else {
774 if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) {
775 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
776 goto bad;
777 }
778 return continue_rmpp(agent, mad_recv_wc);
779 }
780 bad:
781 nack_recv(agent, mad_recv_wc, rmpp_status);
782 ib_free_recv_mad(mad_recv_wc);
783 return NULL;
784 }
785
process_rmpp_stop(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)786 static void process_rmpp_stop(struct ib_mad_agent_private *agent,
787 struct ib_mad_recv_wc *mad_recv_wc)
788 {
789 struct ib_rmpp_mad *rmpp_mad;
790
791 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
792
793 if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) {
794 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
795 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
796 } else
797 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
798 }
799
process_rmpp_abort(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)800 static void process_rmpp_abort(struct ib_mad_agent_private *agent,
801 struct ib_mad_recv_wc *mad_recv_wc)
802 {
803 struct ib_rmpp_mad *rmpp_mad;
804
805 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
806
807 if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN ||
808 rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) {
809 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
810 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
811 } else
812 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
813 }
814
815 struct ib_mad_recv_wc *
ib_process_rmpp_recv_wc(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)816 ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent,
817 struct ib_mad_recv_wc *mad_recv_wc)
818 {
819 struct ib_rmpp_mad *rmpp_mad;
820
821 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
822 if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE))
823 return mad_recv_wc;
824
825 if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) {
826 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
827 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
828 goto out;
829 }
830
831 switch (rmpp_mad->rmpp_hdr.rmpp_type) {
832 case IB_MGMT_RMPP_TYPE_DATA:
833 return process_rmpp_data(agent, mad_recv_wc);
834 case IB_MGMT_RMPP_TYPE_ACK:
835 process_rmpp_ack(agent, mad_recv_wc);
836 break;
837 case IB_MGMT_RMPP_TYPE_STOP:
838 process_rmpp_stop(agent, mad_recv_wc);
839 break;
840 case IB_MGMT_RMPP_TYPE_ABORT:
841 process_rmpp_abort(agent, mad_recv_wc);
842 break;
843 default:
844 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
845 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
846 break;
847 }
848 out:
849 ib_free_recv_mad(mad_recv_wc);
850 return NULL;
851 }
852
init_newwin(struct ib_mad_send_wr_private * mad_send_wr)853 static int init_newwin(struct ib_mad_send_wr_private *mad_send_wr)
854 {
855 struct ib_mad_agent_private *agent = mad_send_wr->mad_agent_priv;
856 struct ib_mad_hdr *mad_hdr = mad_send_wr->send_buf.mad;
857 struct mad_rmpp_recv *rmpp_recv;
858 struct ib_ah_attr ah_attr;
859 unsigned long flags;
860 int newwin = 1;
861
862 if (!(mad_hdr->method & IB_MGMT_METHOD_RESP))
863 goto out;
864
865 spin_lock_irqsave(&agent->lock, flags);
866 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
867 if (rmpp_recv->tid != mad_hdr->tid ||
868 rmpp_recv->mgmt_class != mad_hdr->mgmt_class ||
869 rmpp_recv->class_version != mad_hdr->class_version ||
870 (rmpp_recv->method & IB_MGMT_METHOD_RESP))
871 continue;
872
873 if (ib_query_ah(mad_send_wr->send_buf.ah, &ah_attr))
874 continue;
875
876 if (rmpp_recv->slid == ah_attr.dlid) {
877 newwin = rmpp_recv->repwin;
878 break;
879 }
880 }
881 spin_unlock_irqrestore(&agent->lock, flags);
882 out:
883 return newwin;
884 }
885
ib_send_rmpp_mad(struct ib_mad_send_wr_private * mad_send_wr)886 int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
887 {
888 struct ib_rmpp_mad *rmpp_mad;
889 int ret;
890
891 rmpp_mad = mad_send_wr->send_buf.mad;
892 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
893 IB_MGMT_RMPP_FLAG_ACTIVE))
894 return IB_RMPP_RESULT_UNHANDLED;
895
896 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) {
897 mad_send_wr->seg_num = 1;
898 return IB_RMPP_RESULT_INTERNAL;
899 }
900
901 mad_send_wr->newwin = init_newwin(mad_send_wr);
902
903 /* We need to wait for the final ACK even if there isn't a response */
904 mad_send_wr->refcount += (mad_send_wr->timeout == 0);
905 ret = send_next_seg(mad_send_wr);
906 if (!ret)
907 return IB_RMPP_RESULT_CONSUMED;
908 return ret;
909 }
910
ib_process_rmpp_send_wc(struct ib_mad_send_wr_private * mad_send_wr,struct ib_mad_send_wc * mad_send_wc)911 int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr,
912 struct ib_mad_send_wc *mad_send_wc)
913 {
914 struct ib_rmpp_mad *rmpp_mad;
915 int ret;
916
917 rmpp_mad = mad_send_wr->send_buf.mad;
918 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
919 IB_MGMT_RMPP_FLAG_ACTIVE))
920 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
921
922 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
923 return IB_RMPP_RESULT_INTERNAL; /* ACK, STOP, or ABORT */
924
925 if (mad_send_wc->status != IB_WC_SUCCESS ||
926 mad_send_wr->status != IB_WC_SUCCESS)
927 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */
928
929 if (!mad_send_wr->timeout)
930 return IB_RMPP_RESULT_PROCESSED; /* Response received */
931
932 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
933 mad_send_wr->timeout =
934 msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
935 return IB_RMPP_RESULT_PROCESSED; /* Send done */
936 }
937
938 if (mad_send_wr->seg_num == mad_send_wr->newwin ||
939 mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count)
940 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */
941
942 ret = send_next_seg(mad_send_wr);
943 if (ret) {
944 mad_send_wc->status = IB_WC_GENERAL_ERR;
945 return IB_RMPP_RESULT_PROCESSED;
946 }
947 return IB_RMPP_RESULT_CONSUMED;
948 }
949
ib_retry_rmpp(struct ib_mad_send_wr_private * mad_send_wr)950 int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr)
951 {
952 struct ib_rmpp_mad *rmpp_mad;
953 int ret;
954
955 rmpp_mad = mad_send_wr->send_buf.mad;
956 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
957 IB_MGMT_RMPP_FLAG_ACTIVE))
958 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
959
960 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count)
961 return IB_RMPP_RESULT_PROCESSED;
962
963 mad_send_wr->seg_num = mad_send_wr->last_ack;
964 mad_send_wr->cur_seg = mad_send_wr->last_ack_seg;
965
966 ret = send_next_seg(mad_send_wr);
967 if (ret)
968 return IB_RMPP_RESULT_PROCESSED;
969
970 return IB_RMPP_RESULT_CONSUMED;
971 }
972