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 u32 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 rdma_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 rdma_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 rdma_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 rdma_destroy_ah(mad_send_wc->send_buf->ah,
216 RDMA_DESTROY_AH_SLEEPABLE);
217 ib_free_send_mad(mad_send_wc->send_buf);
218 }
219
nack_recv(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * recv_wc,u8 rmpp_status)220 static void nack_recv(struct ib_mad_agent_private *agent,
221 struct ib_mad_recv_wc *recv_wc, u8 rmpp_status)
222 {
223 struct ib_mad_send_buf *msg;
224 struct ib_rmpp_mad *rmpp_mad;
225 int ret;
226
227 msg = alloc_response_msg(&agent->agent, recv_wc);
228 if (IS_ERR(msg))
229 return;
230
231 rmpp_mad = msg->mad;
232 memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
233
234 rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
235 rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION;
236 rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ABORT;
237 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
238 rmpp_mad->rmpp_hdr.rmpp_status = rmpp_status;
239 rmpp_mad->rmpp_hdr.seg_num = 0;
240 rmpp_mad->rmpp_hdr.paylen_newwin = 0;
241
242 ret = ib_post_send_mad(msg, NULL);
243 if (ret) {
244 rdma_destroy_ah(msg->ah, RDMA_DESTROY_AH_SLEEPABLE);
245 ib_free_send_mad(msg);
246 }
247 }
248
recv_timeout_handler(struct work_struct * work)249 static void recv_timeout_handler(struct work_struct *work)
250 {
251 struct mad_rmpp_recv *rmpp_recv =
252 container_of(work, struct mad_rmpp_recv, timeout_work.work);
253 struct ib_mad_recv_wc *rmpp_wc;
254 unsigned long flags;
255
256 spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
257 if (rmpp_recv->state != RMPP_STATE_ACTIVE) {
258 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
259 return;
260 }
261 rmpp_recv->state = RMPP_STATE_TIMEOUT;
262 list_del(&rmpp_recv->list);
263 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
264
265 rmpp_wc = rmpp_recv->rmpp_wc;
266 nack_recv(rmpp_recv->agent, rmpp_wc, IB_MGMT_RMPP_STATUS_T2L);
267 destroy_rmpp_recv(rmpp_recv);
268 ib_free_recv_mad(rmpp_wc);
269 }
270
recv_cleanup_handler(struct work_struct * work)271 static void recv_cleanup_handler(struct work_struct *work)
272 {
273 struct mad_rmpp_recv *rmpp_recv =
274 container_of(work, struct mad_rmpp_recv, cleanup_work.work);
275 unsigned long flags;
276
277 spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
278 if (rmpp_recv->state == RMPP_STATE_CANCELING) {
279 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
280 return;
281 }
282 list_del(&rmpp_recv->list);
283 spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
284 destroy_rmpp_recv(rmpp_recv);
285 }
286
287 static struct mad_rmpp_recv *
create_rmpp_recv(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)288 create_rmpp_recv(struct ib_mad_agent_private *agent,
289 struct ib_mad_recv_wc *mad_recv_wc)
290 {
291 struct mad_rmpp_recv *rmpp_recv;
292 struct ib_mad_hdr *mad_hdr;
293
294 rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL);
295 if (!rmpp_recv)
296 return NULL;
297
298 rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd,
299 mad_recv_wc->wc,
300 mad_recv_wc->recv_buf.grh,
301 agent->agent.port_num);
302 if (IS_ERR(rmpp_recv->ah))
303 goto error;
304
305 rmpp_recv->agent = agent;
306 init_completion(&rmpp_recv->comp);
307 INIT_DELAYED_WORK(&rmpp_recv->timeout_work, recv_timeout_handler);
308 INIT_DELAYED_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler);
309 spin_lock_init(&rmpp_recv->lock);
310 rmpp_recv->state = RMPP_STATE_ACTIVE;
311 atomic_set(&rmpp_recv->refcount, 1);
312
313 rmpp_recv->rmpp_wc = mad_recv_wc;
314 rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf;
315 rmpp_recv->newwin = 1;
316 rmpp_recv->seg_num = 1;
317 rmpp_recv->last_ack = 0;
318 rmpp_recv->repwin = 1;
319
320 mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
321 rmpp_recv->tid = mad_hdr->tid;
322 rmpp_recv->src_qp = mad_recv_wc->wc->src_qp;
323 rmpp_recv->slid = mad_recv_wc->wc->slid;
324 rmpp_recv->mgmt_class = mad_hdr->mgmt_class;
325 rmpp_recv->class_version = mad_hdr->class_version;
326 rmpp_recv->method = mad_hdr->method;
327 rmpp_recv->base_version = mad_hdr->base_version;
328 return rmpp_recv;
329
330 error: kfree(rmpp_recv);
331 return NULL;
332 }
333
334 static struct mad_rmpp_recv *
find_rmpp_recv(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)335 find_rmpp_recv(struct ib_mad_agent_private *agent,
336 struct ib_mad_recv_wc *mad_recv_wc)
337 {
338 struct mad_rmpp_recv *rmpp_recv;
339 struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
340
341 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
342 if (rmpp_recv->tid == mad_hdr->tid &&
343 rmpp_recv->src_qp == mad_recv_wc->wc->src_qp &&
344 rmpp_recv->slid == mad_recv_wc->wc->slid &&
345 rmpp_recv->mgmt_class == mad_hdr->mgmt_class &&
346 rmpp_recv->class_version == mad_hdr->class_version &&
347 rmpp_recv->method == mad_hdr->method)
348 return rmpp_recv;
349 }
350 return NULL;
351 }
352
353 static struct mad_rmpp_recv *
acquire_rmpp_recv(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)354 acquire_rmpp_recv(struct ib_mad_agent_private *agent,
355 struct ib_mad_recv_wc *mad_recv_wc)
356 {
357 struct mad_rmpp_recv *rmpp_recv;
358 unsigned long flags;
359
360 spin_lock_irqsave(&agent->lock, flags);
361 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
362 if (rmpp_recv)
363 atomic_inc(&rmpp_recv->refcount);
364 spin_unlock_irqrestore(&agent->lock, flags);
365 return rmpp_recv;
366 }
367
368 static struct mad_rmpp_recv *
insert_rmpp_recv(struct ib_mad_agent_private * agent,struct mad_rmpp_recv * rmpp_recv)369 insert_rmpp_recv(struct ib_mad_agent_private *agent,
370 struct mad_rmpp_recv *rmpp_recv)
371 {
372 struct mad_rmpp_recv *cur_rmpp_recv;
373
374 cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc);
375 if (!cur_rmpp_recv)
376 list_add_tail(&rmpp_recv->list, &agent->rmpp_list);
377
378 return cur_rmpp_recv;
379 }
380
get_last_flag(struct ib_mad_recv_buf * seg)381 static inline int get_last_flag(struct ib_mad_recv_buf *seg)
382 {
383 struct ib_rmpp_mad *rmpp_mad;
384
385 rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
386 return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST;
387 }
388
get_seg_num(struct ib_mad_recv_buf * seg)389 static inline int get_seg_num(struct ib_mad_recv_buf *seg)
390 {
391 struct ib_rmpp_mad *rmpp_mad;
392
393 rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
394 return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
395 }
396
get_next_seg(struct list_head * rmpp_list,struct ib_mad_recv_buf * seg)397 static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list,
398 struct ib_mad_recv_buf *seg)
399 {
400 if (seg->list.next == rmpp_list)
401 return NULL;
402
403 return container_of(seg->list.next, struct ib_mad_recv_buf, list);
404 }
405
window_size(struct ib_mad_agent_private * agent)406 static inline int window_size(struct ib_mad_agent_private *agent)
407 {
408 return max(agent->qp_info->recv_queue.max_active >> 3, 1);
409 }
410
find_seg_location(struct list_head * rmpp_list,int seg_num)411 static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list,
412 int seg_num)
413 {
414 struct ib_mad_recv_buf *seg_buf;
415 int cur_seg_num;
416
417 list_for_each_entry_reverse(seg_buf, rmpp_list, list) {
418 cur_seg_num = get_seg_num(seg_buf);
419 if (seg_num > cur_seg_num)
420 return seg_buf;
421 if (seg_num == cur_seg_num)
422 break;
423 }
424 return NULL;
425 }
426
update_seg_num(struct mad_rmpp_recv * rmpp_recv,struct ib_mad_recv_buf * new_buf)427 static void update_seg_num(struct mad_rmpp_recv *rmpp_recv,
428 struct ib_mad_recv_buf *new_buf)
429 {
430 struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list;
431
432 while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) {
433 rmpp_recv->cur_seg_buf = new_buf;
434 rmpp_recv->seg_num++;
435 new_buf = get_next_seg(rmpp_list, new_buf);
436 }
437 }
438
get_mad_len(struct mad_rmpp_recv * rmpp_recv)439 static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv)
440 {
441 struct ib_rmpp_mad *rmpp_mad;
442 int hdr_size, data_size, pad;
443 bool opa = rdma_cap_opa_mad(rmpp_recv->agent->qp_info->port_priv->device,
444 rmpp_recv->agent->qp_info->port_priv->port_num);
445
446 rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad;
447
448 hdr_size = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
449 if (opa && rmpp_recv->base_version == OPA_MGMT_BASE_VERSION) {
450 data_size = sizeof(struct opa_rmpp_mad) - hdr_size;
451 pad = OPA_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
452 if (pad > OPA_MGMT_RMPP_DATA || pad < 0)
453 pad = 0;
454 } else {
455 data_size = sizeof(struct ib_rmpp_mad) - hdr_size;
456 pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
457 if (pad > IB_MGMT_RMPP_DATA || pad < 0)
458 pad = 0;
459 }
460
461 return hdr_size + rmpp_recv->seg_num * data_size - pad;
462 }
463
complete_rmpp(struct mad_rmpp_recv * rmpp_recv)464 static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv)
465 {
466 struct ib_mad_recv_wc *rmpp_wc;
467
468 ack_recv(rmpp_recv, rmpp_recv->rmpp_wc);
469 if (rmpp_recv->seg_num > 1)
470 cancel_delayed_work(&rmpp_recv->timeout_work);
471
472 rmpp_wc = rmpp_recv->rmpp_wc;
473 rmpp_wc->mad_len = get_mad_len(rmpp_recv);
474 /* 10 seconds until we can find the packet lifetime */
475 queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq,
476 &rmpp_recv->cleanup_work, msecs_to_jiffies(10000));
477 return rmpp_wc;
478 }
479
480 static struct ib_mad_recv_wc *
continue_rmpp(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)481 continue_rmpp(struct ib_mad_agent_private *agent,
482 struct ib_mad_recv_wc *mad_recv_wc)
483 {
484 struct mad_rmpp_recv *rmpp_recv;
485 struct ib_mad_recv_buf *prev_buf;
486 struct ib_mad_recv_wc *done_wc;
487 int seg_num;
488 unsigned long flags;
489
490 rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc);
491 if (!rmpp_recv)
492 goto drop1;
493
494 seg_num = get_seg_num(&mad_recv_wc->recv_buf);
495
496 spin_lock_irqsave(&rmpp_recv->lock, flags);
497 if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) ||
498 (seg_num > rmpp_recv->newwin))
499 goto drop3;
500
501 if ((seg_num <= rmpp_recv->last_ack) ||
502 (rmpp_recv->state == RMPP_STATE_COMPLETE)) {
503 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
504 ack_recv(rmpp_recv, mad_recv_wc);
505 goto drop2;
506 }
507
508 prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num);
509 if (!prev_buf)
510 goto drop3;
511
512 done_wc = NULL;
513 list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list);
514 if (rmpp_recv->cur_seg_buf == prev_buf) {
515 update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf);
516 if (get_last_flag(rmpp_recv->cur_seg_buf)) {
517 rmpp_recv->state = RMPP_STATE_COMPLETE;
518 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
519 done_wc = complete_rmpp(rmpp_recv);
520 goto out;
521 } else if (rmpp_recv->seg_num == rmpp_recv->newwin) {
522 rmpp_recv->newwin += window_size(agent);
523 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
524 ack_recv(rmpp_recv, mad_recv_wc);
525 goto out;
526 }
527 }
528 spin_unlock_irqrestore(&rmpp_recv->lock, flags);
529 out:
530 deref_rmpp_recv(rmpp_recv);
531 return done_wc;
532
533 drop3: spin_unlock_irqrestore(&rmpp_recv->lock, flags);
534 drop2: deref_rmpp_recv(rmpp_recv);
535 drop1: ib_free_recv_mad(mad_recv_wc);
536 return NULL;
537 }
538
539 static struct ib_mad_recv_wc *
start_rmpp(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)540 start_rmpp(struct ib_mad_agent_private *agent,
541 struct ib_mad_recv_wc *mad_recv_wc)
542 {
543 struct mad_rmpp_recv *rmpp_recv;
544 unsigned long flags;
545
546 rmpp_recv = create_rmpp_recv(agent, mad_recv_wc);
547 if (!rmpp_recv) {
548 ib_free_recv_mad(mad_recv_wc);
549 return NULL;
550 }
551
552 spin_lock_irqsave(&agent->lock, flags);
553 if (insert_rmpp_recv(agent, rmpp_recv)) {
554 spin_unlock_irqrestore(&agent->lock, flags);
555 /* duplicate first MAD */
556 destroy_rmpp_recv(rmpp_recv);
557 return continue_rmpp(agent, mad_recv_wc);
558 }
559 atomic_inc(&rmpp_recv->refcount);
560
561 if (get_last_flag(&mad_recv_wc->recv_buf)) {
562 rmpp_recv->state = RMPP_STATE_COMPLETE;
563 spin_unlock_irqrestore(&agent->lock, flags);
564 complete_rmpp(rmpp_recv);
565 } else {
566 spin_unlock_irqrestore(&agent->lock, flags);
567 /* 40 seconds until we can find the packet lifetimes */
568 queue_delayed_work(agent->qp_info->port_priv->wq,
569 &rmpp_recv->timeout_work,
570 msecs_to_jiffies(40000));
571 rmpp_recv->newwin += window_size(agent);
572 ack_recv(rmpp_recv, mad_recv_wc);
573 mad_recv_wc = NULL;
574 }
575 deref_rmpp_recv(rmpp_recv);
576 return mad_recv_wc;
577 }
578
send_next_seg(struct ib_mad_send_wr_private * mad_send_wr)579 static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr)
580 {
581 struct ib_rmpp_mad *rmpp_mad;
582 int timeout;
583 u32 paylen = 0;
584
585 rmpp_mad = mad_send_wr->send_buf.mad;
586 ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
587 rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num);
588
589 if (mad_send_wr->seg_num == 1) {
590 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST;
591 paylen = (mad_send_wr->send_buf.seg_count *
592 mad_send_wr->send_buf.seg_rmpp_size) -
593 mad_send_wr->pad;
594 }
595
596 if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) {
597 rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST;
598 paylen = mad_send_wr->send_buf.seg_rmpp_size - mad_send_wr->pad;
599 }
600 rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
601
602 /* 2 seconds for an ACK until we can find the packet lifetime */
603 timeout = mad_send_wr->send_buf.timeout_ms;
604 if (!timeout || timeout > 2000)
605 mad_send_wr->timeout = msecs_to_jiffies(2000);
606
607 return ib_send_mad(mad_send_wr);
608 }
609
abort_send(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc,u8 rmpp_status)610 static void abort_send(struct ib_mad_agent_private *agent,
611 struct ib_mad_recv_wc *mad_recv_wc, u8 rmpp_status)
612 {
613 struct ib_mad_send_wr_private *mad_send_wr;
614 struct ib_mad_send_wc wc;
615 unsigned long flags;
616
617 spin_lock_irqsave(&agent->lock, flags);
618 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
619 if (!mad_send_wr)
620 goto out; /* Unmatched send */
621
622 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
623 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
624 goto out; /* Send is already done */
625
626 ib_mark_mad_done(mad_send_wr);
627 spin_unlock_irqrestore(&agent->lock, flags);
628
629 wc.status = IB_WC_REM_ABORT_ERR;
630 wc.vendor_err = rmpp_status;
631 wc.send_buf = &mad_send_wr->send_buf;
632 ib_mad_complete_send_wr(mad_send_wr, &wc);
633 return;
634 out:
635 spin_unlock_irqrestore(&agent->lock, flags);
636 }
637
adjust_last_ack(struct ib_mad_send_wr_private * wr,int seg_num)638 static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr,
639 int seg_num)
640 {
641 struct list_head *list;
642
643 wr->last_ack = seg_num;
644 list = &wr->last_ack_seg->list;
645 list_for_each_entry(wr->last_ack_seg, list, list)
646 if (wr->last_ack_seg->num == seg_num)
647 break;
648 }
649
process_ds_ack(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc,int newwin)650 static void process_ds_ack(struct ib_mad_agent_private *agent,
651 struct ib_mad_recv_wc *mad_recv_wc, int newwin)
652 {
653 struct mad_rmpp_recv *rmpp_recv;
654
655 rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
656 if (rmpp_recv && rmpp_recv->state == RMPP_STATE_COMPLETE)
657 rmpp_recv->repwin = newwin;
658 }
659
process_rmpp_ack(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)660 static void process_rmpp_ack(struct ib_mad_agent_private *agent,
661 struct ib_mad_recv_wc *mad_recv_wc)
662 {
663 struct ib_mad_send_wr_private *mad_send_wr;
664 struct ib_rmpp_mad *rmpp_mad;
665 unsigned long flags;
666 int seg_num, newwin, ret;
667
668 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
669 if (rmpp_mad->rmpp_hdr.rmpp_status) {
670 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
671 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
672 return;
673 }
674
675 seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
676 newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
677 if (newwin < seg_num) {
678 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
679 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
680 return;
681 }
682
683 spin_lock_irqsave(&agent->lock, flags);
684 mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
685 if (!mad_send_wr) {
686 if (!seg_num)
687 process_ds_ack(agent, mad_recv_wc, newwin);
688 goto out; /* Unmatched or DS RMPP ACK */
689 }
690
691 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) &&
692 (mad_send_wr->timeout)) {
693 spin_unlock_irqrestore(&agent->lock, flags);
694 ack_ds_ack(agent, mad_recv_wc);
695 return; /* Repeated ACK for DS RMPP transaction */
696 }
697
698 if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
699 (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
700 goto out; /* Send is already done */
701
702 if (seg_num > mad_send_wr->send_buf.seg_count ||
703 seg_num > mad_send_wr->newwin) {
704 spin_unlock_irqrestore(&agent->lock, flags);
705 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
706 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
707 return;
708 }
709
710 if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack)
711 goto out; /* Old ACK */
712
713 if (seg_num > mad_send_wr->last_ack) {
714 adjust_last_ack(mad_send_wr, seg_num);
715 mad_send_wr->retries_left = mad_send_wr->max_retries;
716 }
717 mad_send_wr->newwin = newwin;
718 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
719 /* If no response is expected, the ACK completes the send */
720 if (!mad_send_wr->send_buf.timeout_ms) {
721 struct ib_mad_send_wc wc;
722
723 ib_mark_mad_done(mad_send_wr);
724 spin_unlock_irqrestore(&agent->lock, flags);
725
726 wc.status = IB_WC_SUCCESS;
727 wc.vendor_err = 0;
728 wc.send_buf = &mad_send_wr->send_buf;
729 ib_mad_complete_send_wr(mad_send_wr, &wc);
730 return;
731 }
732 if (mad_send_wr->refcount == 1)
733 ib_reset_mad_timeout(mad_send_wr,
734 mad_send_wr->send_buf.timeout_ms);
735 spin_unlock_irqrestore(&agent->lock, flags);
736 ack_ds_ack(agent, mad_recv_wc);
737 return;
738 } else if (mad_send_wr->refcount == 1 &&
739 mad_send_wr->seg_num < mad_send_wr->newwin &&
740 mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) {
741 /* Send failure will just result in a timeout/retry */
742 ret = send_next_seg(mad_send_wr);
743 if (ret)
744 goto out;
745
746 mad_send_wr->refcount++;
747 list_move_tail(&mad_send_wr->agent_list,
748 &mad_send_wr->mad_agent_priv->send_list);
749 }
750 out:
751 spin_unlock_irqrestore(&agent->lock, flags);
752 }
753
754 static struct ib_mad_recv_wc *
process_rmpp_data(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)755 process_rmpp_data(struct ib_mad_agent_private *agent,
756 struct ib_mad_recv_wc *mad_recv_wc)
757 {
758 struct ib_rmpp_hdr *rmpp_hdr;
759 u8 rmpp_status;
760
761 rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr;
762
763 if (rmpp_hdr->rmpp_status) {
764 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS;
765 goto bad;
766 }
767
768 if (rmpp_hdr->seg_num == cpu_to_be32(1)) {
769 if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) {
770 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
771 goto bad;
772 }
773 return start_rmpp(agent, mad_recv_wc);
774 } else {
775 if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) {
776 rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
777 goto bad;
778 }
779 return continue_rmpp(agent, mad_recv_wc);
780 }
781 bad:
782 nack_recv(agent, mad_recv_wc, rmpp_status);
783 ib_free_recv_mad(mad_recv_wc);
784 return NULL;
785 }
786
process_rmpp_stop(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)787 static void process_rmpp_stop(struct ib_mad_agent_private *agent,
788 struct ib_mad_recv_wc *mad_recv_wc)
789 {
790 struct ib_rmpp_mad *rmpp_mad;
791
792 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
793
794 if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) {
795 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
796 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
797 } else
798 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
799 }
800
process_rmpp_abort(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)801 static void process_rmpp_abort(struct ib_mad_agent_private *agent,
802 struct ib_mad_recv_wc *mad_recv_wc)
803 {
804 struct ib_rmpp_mad *rmpp_mad;
805
806 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
807
808 if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN ||
809 rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) {
810 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
811 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
812 } else
813 abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
814 }
815
816 struct ib_mad_recv_wc *
ib_process_rmpp_recv_wc(struct ib_mad_agent_private * agent,struct ib_mad_recv_wc * mad_recv_wc)817 ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent,
818 struct ib_mad_recv_wc *mad_recv_wc)
819 {
820 struct ib_rmpp_mad *rmpp_mad;
821
822 rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
823 if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE))
824 return mad_recv_wc;
825
826 if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) {
827 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
828 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
829 goto out;
830 }
831
832 switch (rmpp_mad->rmpp_hdr.rmpp_type) {
833 case IB_MGMT_RMPP_TYPE_DATA:
834 return process_rmpp_data(agent, mad_recv_wc);
835 case IB_MGMT_RMPP_TYPE_ACK:
836 process_rmpp_ack(agent, mad_recv_wc);
837 break;
838 case IB_MGMT_RMPP_TYPE_STOP:
839 process_rmpp_stop(agent, mad_recv_wc);
840 break;
841 case IB_MGMT_RMPP_TYPE_ABORT:
842 process_rmpp_abort(agent, mad_recv_wc);
843 break;
844 default:
845 abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
846 nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
847 break;
848 }
849 out:
850 ib_free_recv_mad(mad_recv_wc);
851 return NULL;
852 }
853
init_newwin(struct ib_mad_send_wr_private * mad_send_wr)854 static int init_newwin(struct ib_mad_send_wr_private *mad_send_wr)
855 {
856 struct ib_mad_agent_private *agent = mad_send_wr->mad_agent_priv;
857 struct ib_mad_hdr *mad_hdr = mad_send_wr->send_buf.mad;
858 struct mad_rmpp_recv *rmpp_recv;
859 struct rdma_ah_attr ah_attr;
860 unsigned long flags;
861 int newwin = 1;
862
863 if (!(mad_hdr->method & IB_MGMT_METHOD_RESP))
864 goto out;
865
866 spin_lock_irqsave(&agent->lock, flags);
867 list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
868 if (rmpp_recv->tid != mad_hdr->tid ||
869 rmpp_recv->mgmt_class != mad_hdr->mgmt_class ||
870 rmpp_recv->class_version != mad_hdr->class_version ||
871 (rmpp_recv->method & IB_MGMT_METHOD_RESP))
872 continue;
873
874 if (rdma_query_ah(mad_send_wr->send_buf.ah, &ah_attr))
875 continue;
876
877 if (rmpp_recv->slid == rdma_ah_get_dlid(&ah_attr)) {
878 newwin = rmpp_recv->repwin;
879 break;
880 }
881 }
882 spin_unlock_irqrestore(&agent->lock, flags);
883 out:
884 return newwin;
885 }
886
ib_send_rmpp_mad(struct ib_mad_send_wr_private * mad_send_wr)887 int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
888 {
889 struct ib_rmpp_mad *rmpp_mad;
890 int ret;
891
892 rmpp_mad = mad_send_wr->send_buf.mad;
893 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
894 IB_MGMT_RMPP_FLAG_ACTIVE))
895 return IB_RMPP_RESULT_UNHANDLED;
896
897 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) {
898 mad_send_wr->seg_num = 1;
899 return IB_RMPP_RESULT_INTERNAL;
900 }
901
902 mad_send_wr->newwin = init_newwin(mad_send_wr);
903
904 /* We need to wait for the final ACK even if there isn't a response */
905 mad_send_wr->refcount += (mad_send_wr->timeout == 0);
906 ret = send_next_seg(mad_send_wr);
907 if (!ret)
908 return IB_RMPP_RESULT_CONSUMED;
909 return ret;
910 }
911
ib_process_rmpp_send_wc(struct ib_mad_send_wr_private * mad_send_wr,struct ib_mad_send_wc * mad_send_wc)912 int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr,
913 struct ib_mad_send_wc *mad_send_wc)
914 {
915 struct ib_rmpp_mad *rmpp_mad;
916 int ret;
917
918 rmpp_mad = mad_send_wr->send_buf.mad;
919 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
920 IB_MGMT_RMPP_FLAG_ACTIVE))
921 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
922
923 if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
924 return IB_RMPP_RESULT_INTERNAL; /* ACK, STOP, or ABORT */
925
926 if (mad_send_wc->status != IB_WC_SUCCESS ||
927 mad_send_wr->status != IB_WC_SUCCESS)
928 return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */
929
930 if (!mad_send_wr->timeout)
931 return IB_RMPP_RESULT_PROCESSED; /* Response received */
932
933 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
934 mad_send_wr->timeout =
935 msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
936 return IB_RMPP_RESULT_PROCESSED; /* Send done */
937 }
938
939 if (mad_send_wr->seg_num == mad_send_wr->newwin ||
940 mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count)
941 return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */
942
943 ret = send_next_seg(mad_send_wr);
944 if (ret) {
945 mad_send_wc->status = IB_WC_GENERAL_ERR;
946 return IB_RMPP_RESULT_PROCESSED;
947 }
948 return IB_RMPP_RESULT_CONSUMED;
949 }
950
ib_retry_rmpp(struct ib_mad_send_wr_private * mad_send_wr)951 int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr)
952 {
953 struct ib_rmpp_mad *rmpp_mad;
954 int ret;
955
956 rmpp_mad = mad_send_wr->send_buf.mad;
957 if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
958 IB_MGMT_RMPP_FLAG_ACTIVE))
959 return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
960
961 if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count)
962 return IB_RMPP_RESULT_PROCESSED;
963
964 mad_send_wr->seg_num = mad_send_wr->last_ack;
965 mad_send_wr->cur_seg = mad_send_wr->last_ack_seg;
966
967 ret = send_next_seg(mad_send_wr);
968 if (ret)
969 return IB_RMPP_RESULT_PROCESSED;
970
971 return IB_RMPP_RESULT_CONSUMED;
972 }
973