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/drivers/infiniband/core/mad_rmpp.c

https://bitbucket.org/ndreys/linux-sunxi
C | 953 lines | 765 code | 149 blank | 39 comment | 138 complexity | f0ff9e75691ca8ef3d11ca75776837f2 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  1/*
  2 * Copyright (c) 2005 Intel Inc. All rights reserved.
  3 * Copyright (c) 2005-2006 Voltaire, Inc. All rights reserved.
  4 *
  5 * This software is available to you under a choice of one of two
  6 * licenses.  You may choose to be licensed under the terms of the GNU
  7 * General Public License (GPL) Version 2, available from the file
  8 * COPYING in the main directory of this source tree, or the
  9 * OpenIB.org BSD license below:
 10 *
 11 *     Redistribution and use in source and binary forms, with or
 12 *     without modification, are permitted provided that the following
 13 *     conditions are met:
 14 *
 15 *      - Redistributions of source code must retain the above
 16 *        copyright notice, this list of conditions and the following
 17 *        disclaimer.
 18 *
 19 *      - Redistributions in binary form must reproduce the above
 20 *        copyright notice, this list of conditions and the following
 21 *        disclaimer in the documentation and/or other materials
 22 *        provided with the distribution.
 23 *
 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 31 * SOFTWARE.
 32 */
 33
 34#include <linux/slab.h>
 35
 36#include "mad_priv.h"
 37#include "mad_rmpp.h"
 38
 39enum rmpp_state {
 40	RMPP_STATE_ACTIVE,
 41	RMPP_STATE_TIMEOUT,
 42	RMPP_STATE_COMPLETE,
 43	RMPP_STATE_CANCELING
 44};
 45
 46struct mad_rmpp_recv {
 47	struct ib_mad_agent_private *agent;
 48	struct list_head list;
 49	struct delayed_work timeout_work;
 50	struct delayed_work cleanup_work;
 51	struct completion comp;
 52	enum rmpp_state state;
 53	spinlock_t lock;
 54	atomic_t refcount;
 55
 56	struct ib_ah *ah;
 57	struct ib_mad_recv_wc *rmpp_wc;
 58	struct ib_mad_recv_buf *cur_seg_buf;
 59	int last_ack;
 60	int seg_num;
 61	int newwin;
 62	int repwin;
 63
 64	__be64 tid;
 65	u32 src_qp;
 66	u16 slid;
 67	u8 mgmt_class;
 68	u8 class_version;
 69	u8 method;
 70};
 71
 72static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
 73{
 74	if (atomic_dec_and_test(&rmpp_recv->refcount))
 75		complete(&rmpp_recv->comp);
 76}
 77
 78static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
 79{
 80	deref_rmpp_recv(rmpp_recv);
 81	wait_for_completion(&rmpp_recv->comp);
 82	ib_destroy_ah(rmpp_recv->ah);
 83	kfree(rmpp_recv);
 84}
 85
 86void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent)
 87{
 88	struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv;
 89	unsigned long flags;
 90
 91	spin_lock_irqsave(&agent->lock, flags);
 92	list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
 93		if (rmpp_recv->state != RMPP_STATE_COMPLETE)
 94			ib_free_recv_mad(rmpp_recv->rmpp_wc);
 95		rmpp_recv->state = RMPP_STATE_CANCELING;
 96	}
 97	spin_unlock_irqrestore(&agent->lock, flags);
 98
 99	list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
100		cancel_delayed_work(&rmpp_recv->timeout_work);
101		cancel_delayed_work(&rmpp_recv->cleanup_work);
102	}
103
104	flush_workqueue(agent->qp_info->port_priv->wq);
105
106	list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv,
107				 &agent->rmpp_list, list) {
108		list_del(&rmpp_recv->list);
109		destroy_rmpp_recv(rmpp_recv);
110	}
111}
112
113static void format_ack(struct ib_mad_send_buf *msg,
114		       struct ib_rmpp_mad *data,
115		       struct mad_rmpp_recv *rmpp_recv)
116{
117	struct ib_rmpp_mad *ack = msg->mad;
118	unsigned long flags;
119
120	memcpy(ack, &data->mad_hdr, msg->hdr_len);
121
122	ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
123	ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK;
124	ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
125
126	spin_lock_irqsave(&rmpp_recv->lock, flags);
127	rmpp_recv->last_ack = rmpp_recv->seg_num;
128	ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num);
129	ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin);
130	spin_unlock_irqrestore(&rmpp_recv->lock, flags);
131}
132
133static void ack_recv(struct mad_rmpp_recv *rmpp_recv,
134		     struct ib_mad_recv_wc *recv_wc)
135{
136	struct ib_mad_send_buf *msg;
137	int ret, hdr_len;
138
139	hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
140	msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp,
141				 recv_wc->wc->pkey_index, 1, hdr_len,
142				 0, GFP_KERNEL);
143	if (IS_ERR(msg))
144		return;
145
146	format_ack(msg, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv);
147	msg->ah = rmpp_recv->ah;
148	ret = ib_post_send_mad(msg, NULL);
149	if (ret)
150		ib_free_send_mad(msg);
151}
152
153static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent,
154						  struct ib_mad_recv_wc *recv_wc)
155{
156	struct ib_mad_send_buf *msg;
157	struct ib_ah *ah;
158	int hdr_len;
159
160	ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc,
161				  recv_wc->recv_buf.grh, agent->port_num);
162	if (IS_ERR(ah))
163		return (void *) ah;
164
165	hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
166	msg = ib_create_send_mad(agent, recv_wc->wc->src_qp,
167				 recv_wc->wc->pkey_index, 1,
168				 hdr_len, 0, GFP_KERNEL);
169	if (IS_ERR(msg))
170		ib_destroy_ah(ah);
171	else {
172		msg->ah = ah;
173		msg->context[0] = ah;
174	}
175
176	return msg;
177}
178
179static void ack_ds_ack(struct ib_mad_agent_private *agent,
180		       struct ib_mad_recv_wc *recv_wc)
181{
182	struct ib_mad_send_buf *msg;
183	struct ib_rmpp_mad *rmpp_mad;
184	int ret;
185
186	msg = alloc_response_msg(&agent->agent, recv_wc);
187	if (IS_ERR(msg))
188		return;
189
190	rmpp_mad = msg->mad;
191	memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
192
193	rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
194	ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
195	rmpp_mad->rmpp_hdr.seg_num = 0;
196	rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(1);
197
198	ret = ib_post_send_mad(msg, NULL);
199	if (ret) {
200		ib_destroy_ah(msg->ah);
201		ib_free_send_mad(msg);
202	}
203}
204
205void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc)
206{
207	if (mad_send_wc->send_buf->context[0] == mad_send_wc->send_buf->ah)
208		ib_destroy_ah(mad_send_wc->send_buf->ah);
209	ib_free_send_mad(mad_send_wc->send_buf);
210}
211
212static void nack_recv(struct ib_mad_agent_private *agent,
213		      struct ib_mad_recv_wc *recv_wc, u8 rmpp_status)
214{
215	struct ib_mad_send_buf *msg;
216	struct ib_rmpp_mad *rmpp_mad;
217	int ret;
218
219	msg = alloc_response_msg(&agent->agent, recv_wc);
220	if (IS_ERR(msg))
221		return;
222
223	rmpp_mad = msg->mad;
224	memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
225
226	rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
227	rmpp_mad->rmpp_hdr.rmpp_version = IB_MGMT_RMPP_VERSION;
228	rmpp_mad->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ABORT;
229	ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
230	rmpp_mad->rmpp_hdr.rmpp_status = rmpp_status;
231	rmpp_mad->rmpp_hdr.seg_num = 0;
232	rmpp_mad->rmpp_hdr.paylen_newwin = 0;
233
234	ret = ib_post_send_mad(msg, NULL);
235	if (ret) {
236		ib_destroy_ah(msg->ah);
237		ib_free_send_mad(msg);
238	}
239}
240
241static 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
263static void recv_cleanup_handler(struct work_struct *work)
264{
265	struct mad_rmpp_recv *rmpp_recv =
266		container_of(work, struct mad_rmpp_recv, cleanup_work.work);
267	unsigned long flags;
268
269	spin_lock_irqsave(&rmpp_recv->agent->lock, flags);
270	if (rmpp_recv->state == RMPP_STATE_CANCELING) {
271		spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
272		return;
273	}
274	list_del(&rmpp_recv->list);
275	spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
276	destroy_rmpp_recv(rmpp_recv);
277}
278
279static struct mad_rmpp_recv *
280create_rmpp_recv(struct ib_mad_agent_private *agent,
281		 struct ib_mad_recv_wc *mad_recv_wc)
282{
283	struct mad_rmpp_recv *rmpp_recv;
284	struct ib_mad_hdr *mad_hdr;
285
286	rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL);
287	if (!rmpp_recv)
288		return NULL;
289
290	rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd,
291					     mad_recv_wc->wc,
292					     mad_recv_wc->recv_buf.grh,
293					     agent->agent.port_num);
294	if (IS_ERR(rmpp_recv->ah))
295		goto error;
296
297	rmpp_recv->agent = agent;
298	init_completion(&rmpp_recv->comp);
299	INIT_DELAYED_WORK(&rmpp_recv->timeout_work, recv_timeout_handler);
300	INIT_DELAYED_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler);
301	spin_lock_init(&rmpp_recv->lock);
302	rmpp_recv->state = RMPP_STATE_ACTIVE;
303	atomic_set(&rmpp_recv->refcount, 1);
304
305	rmpp_recv->rmpp_wc = mad_recv_wc;
306	rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf;
307	rmpp_recv->newwin = 1;
308	rmpp_recv->seg_num = 1;
309	rmpp_recv->last_ack = 0;
310	rmpp_recv->repwin = 1;
311
312	mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
313	rmpp_recv->tid = mad_hdr->tid;
314	rmpp_recv->src_qp = mad_recv_wc->wc->src_qp;
315	rmpp_recv->slid = mad_recv_wc->wc->slid;
316	rmpp_recv->mgmt_class = mad_hdr->mgmt_class;
317	rmpp_recv->class_version = mad_hdr->class_version;
318	rmpp_recv->method  = mad_hdr->method;
319	return rmpp_recv;
320
321error:	kfree(rmpp_recv);
322	return NULL;
323}
324
325static struct mad_rmpp_recv *
326find_rmpp_recv(struct ib_mad_agent_private *agent,
327	       struct ib_mad_recv_wc *mad_recv_wc)
328{
329	struct mad_rmpp_recv *rmpp_recv;
330	struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
331
332	list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
333		if (rmpp_recv->tid == mad_hdr->tid &&
334		    rmpp_recv->src_qp == mad_recv_wc->wc->src_qp &&
335		    rmpp_recv->slid == mad_recv_wc->wc->slid &&
336		    rmpp_recv->mgmt_class == mad_hdr->mgmt_class &&
337		    rmpp_recv->class_version == mad_hdr->class_version &&
338		    rmpp_recv->method == mad_hdr->method)
339			return rmpp_recv;
340	}
341	return NULL;
342}
343
344static struct mad_rmpp_recv *
345acquire_rmpp_recv(struct ib_mad_agent_private *agent,
346		  struct ib_mad_recv_wc *mad_recv_wc)
347{
348	struct mad_rmpp_recv *rmpp_recv;
349	unsigned long flags;
350
351	spin_lock_irqsave(&agent->lock, flags);
352	rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
353	if (rmpp_recv)
354		atomic_inc(&rmpp_recv->refcount);
355	spin_unlock_irqrestore(&agent->lock, flags);
356	return rmpp_recv;
357}
358
359static struct mad_rmpp_recv *
360insert_rmpp_recv(struct ib_mad_agent_private *agent,
361		 struct mad_rmpp_recv *rmpp_recv)
362{
363	struct mad_rmpp_recv *cur_rmpp_recv;
364
365	cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc);
366	if (!cur_rmpp_recv)
367		list_add_tail(&rmpp_recv->list, &agent->rmpp_list);
368
369	return cur_rmpp_recv;
370}
371
372static inline int get_last_flag(struct ib_mad_recv_buf *seg)
373{
374	struct ib_rmpp_mad *rmpp_mad;
375
376	rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
377	return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST;
378}
379
380static inline int get_seg_num(struct ib_mad_recv_buf *seg)
381{
382	struct ib_rmpp_mad *rmpp_mad;
383
384	rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
385	return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
386}
387
388static inline struct ib_mad_recv_buf * get_next_seg(struct list_head *rmpp_list,
389						    struct ib_mad_recv_buf *seg)
390{
391	if (seg->list.next == rmpp_list)
392		return NULL;
393
394	return container_of(seg->list.next, struct ib_mad_recv_buf, list);
395}
396
397static inline int window_size(struct ib_mad_agent_private *agent)
398{
399	return max(agent->qp_info->recv_queue.max_active >> 3, 1);
400}
401
402static struct ib_mad_recv_buf * find_seg_location(struct list_head *rmpp_list,
403						  int seg_num)
404{
405	struct ib_mad_recv_buf *seg_buf;
406	int cur_seg_num;
407
408	list_for_each_entry_reverse(seg_buf, rmpp_list, list) {
409		cur_seg_num = get_seg_num(seg_buf);
410		if (seg_num > cur_seg_num)
411			return seg_buf;
412		if (seg_num == cur_seg_num)
413			break;
414	}
415	return NULL;
416}
417
418static void update_seg_num(struct mad_rmpp_recv *rmpp_recv,
419			   struct ib_mad_recv_buf *new_buf)
420{
421	struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list;
422
423	while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) {
424		rmpp_recv->cur_seg_buf = new_buf;
425		rmpp_recv->seg_num++;
426		new_buf = get_next_seg(rmpp_list, new_buf);
427	}
428}
429
430static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv)
431{
432	struct ib_rmpp_mad *rmpp_mad;
433	int hdr_size, data_size, pad;
434
435	rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad;
436
437	hdr_size = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
438	data_size = sizeof(struct ib_rmpp_mad) - hdr_size;
439	pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
440	if (pad > IB_MGMT_RMPP_DATA || pad < 0)
441		pad = 0;
442
443	return hdr_size + rmpp_recv->seg_num * data_size - pad;
444}
445
446static struct ib_mad_recv_wc * complete_rmpp(struct mad_rmpp_recv *rmpp_recv)
447{
448	struct ib_mad_recv_wc *rmpp_wc;
449
450	ack_recv(rmpp_recv, rmpp_recv->rmpp_wc);
451	if (rmpp_recv->seg_num > 1)
452		cancel_delayed_work(&rmpp_recv->timeout_work);
453
454	rmpp_wc = rmpp_recv->rmpp_wc;
455	rmpp_wc->mad_len = get_mad_len(rmpp_recv);
456	/* 10 seconds until we can find the packet lifetime */
457	queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq,
458			   &rmpp_recv->cleanup_work, msecs_to_jiffies(10000));
459	return rmpp_wc;
460}
461
462static struct ib_mad_recv_wc *
463continue_rmpp(struct ib_mad_agent_private *agent,
464	      struct ib_mad_recv_wc *mad_recv_wc)
465{
466	struct mad_rmpp_recv *rmpp_recv;
467	struct ib_mad_recv_buf *prev_buf;
468	struct ib_mad_recv_wc *done_wc;
469	int seg_num;
470	unsigned long flags;
471
472	rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc);
473	if (!rmpp_recv)
474		goto drop1;
475
476	seg_num = get_seg_num(&mad_recv_wc->recv_buf);
477
478	spin_lock_irqsave(&rmpp_recv->lock, flags);
479	if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) ||
480	    (seg_num > rmpp_recv->newwin))
481		goto drop3;
482
483	if ((seg_num <= rmpp_recv->last_ack) ||
484	    (rmpp_recv->state == RMPP_STATE_COMPLETE)) {
485		spin_unlock_irqrestore(&rmpp_recv->lock, flags);
486		ack_recv(rmpp_recv, mad_recv_wc);
487		goto drop2;
488	}
489
490	prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num);
491	if (!prev_buf)
492		goto drop3;
493
494	done_wc = NULL;
495	list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list);
496	if (rmpp_recv->cur_seg_buf == prev_buf) {
497		update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf);
498		if (get_last_flag(rmpp_recv->cur_seg_buf)) {
499			rmpp_recv->state = RMPP_STATE_COMPLETE;
500			spin_unlock_irqrestore(&rmpp_recv->lock, flags);
501			done_wc = complete_rmpp(rmpp_recv);
502			goto out;
503		} else if (rmpp_recv->seg_num == rmpp_recv->newwin) {
504			rmpp_recv->newwin += window_size(agent);
505			spin_unlock_irqrestore(&rmpp_recv->lock, flags);
506			ack_recv(rmpp_recv, mad_recv_wc);
507			goto out;
508		}
509	}
510	spin_unlock_irqrestore(&rmpp_recv->lock, flags);
511out:
512	deref_rmpp_recv(rmpp_recv);
513	return done_wc;
514
515drop3:	spin_unlock_irqrestore(&rmpp_recv->lock, flags);
516drop2:	deref_rmpp_recv(rmpp_recv);
517drop1:	ib_free_recv_mad(mad_recv_wc);
518	return NULL;
519}
520
521static struct ib_mad_recv_wc *
522start_rmpp(struct ib_mad_agent_private *agent,
523	   struct ib_mad_recv_wc *mad_recv_wc)
524{
525	struct mad_rmpp_recv *rmpp_recv;
526	unsigned long flags;
527
528	rmpp_recv = create_rmpp_recv(agent, mad_recv_wc);
529	if (!rmpp_recv) {
530		ib_free_recv_mad(mad_recv_wc);
531		return NULL;
532	}
533
534	spin_lock_irqsave(&agent->lock, flags);
535	if (insert_rmpp_recv(agent, rmpp_recv)) {
536		spin_unlock_irqrestore(&agent->lock, flags);
537		/* duplicate first MAD */
538		destroy_rmpp_recv(rmpp_recv);
539		return continue_rmpp(agent, mad_recv_wc);
540	}
541	atomic_inc(&rmpp_recv->refcount);
542
543	if (get_last_flag(&mad_recv_wc->recv_buf)) {
544		rmpp_recv->state = RMPP_STATE_COMPLETE;
545		spin_unlock_irqrestore(&agent->lock, flags);
546		complete_rmpp(rmpp_recv);
547	} else {
548		spin_unlock_irqrestore(&agent->lock, flags);
549		/* 40 seconds until we can find the packet lifetimes */
550		queue_delayed_work(agent->qp_info->port_priv->wq,
551				   &rmpp_recv->timeout_work,
552				   msecs_to_jiffies(40000));
553		rmpp_recv->newwin += window_size(agent);
554		ack_recv(rmpp_recv, mad_recv_wc);
555		mad_recv_wc = NULL;
556	}
557	deref_rmpp_recv(rmpp_recv);
558	return mad_recv_wc;
559}
560
561static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr)
562{
563	struct ib_rmpp_mad *rmpp_mad;
564	int timeout;
565	u32 paylen = 0;
566
567	rmpp_mad = mad_send_wr->send_buf.mad;
568	ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
569	rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num);
570
571	if (mad_send_wr->seg_num == 1) {
572		rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST;
573		paylen = mad_send_wr->send_buf.seg_count * IB_MGMT_RMPP_DATA -
574			 mad_send_wr->pad;
575	}
576
577	if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) {
578		rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST;
579		paylen = IB_MGMT_RMPP_DATA - mad_send_wr->pad;
580	}
581	rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
582
583	/* 2 seconds for an ACK until we can find the packet lifetime */
584	timeout = mad_send_wr->send_buf.timeout_ms;
585	if (!timeout || timeout > 2000)
586		mad_send_wr->timeout = msecs_to_jiffies(2000);
587
588	return ib_send_mad(mad_send_wr);
589}
590
591static void abort_send(struct ib_mad_agent_private *agent,
592		       struct ib_mad_recv_wc *mad_recv_wc, u8 rmpp_status)
593{
594	struct ib_mad_send_wr_private *mad_send_wr;
595	struct ib_mad_send_wc wc;
596	unsigned long flags;
597
598	spin_lock_irqsave(&agent->lock, flags);
599	mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
600	if (!mad_send_wr)
601		goto out;	/* Unmatched send */
602
603	if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
604	    (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
605		goto out;	/* Send is already done */
606
607	ib_mark_mad_done(mad_send_wr);
608	spin_unlock_irqrestore(&agent->lock, flags);
609
610	wc.status = IB_WC_REM_ABORT_ERR;
611	wc.vendor_err = rmpp_status;
612	wc.send_buf = &mad_send_wr->send_buf;
613	ib_mad_complete_send_wr(mad_send_wr, &wc);
614	return;
615out:
616	spin_unlock_irqrestore(&agent->lock, flags);
617}
618
619static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr,
620				   int seg_num)
621{
622	struct list_head *list;
623
624	wr->last_ack = seg_num;
625	list = &wr->last_ack_seg->list;
626	list_for_each_entry(wr->last_ack_seg, list, list)
627		if (wr->last_ack_seg->num == seg_num)
628			break;
629}
630
631static void process_ds_ack(struct ib_mad_agent_private *agent,
632			   struct ib_mad_recv_wc *mad_recv_wc, int newwin)
633{
634	struct mad_rmpp_recv *rmpp_recv;
635
636	rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
637	if (rmpp_recv && rmpp_recv->state == RMPP_STATE_COMPLETE)
638		rmpp_recv->repwin = newwin;
639}
640
641static void process_rmpp_ack(struct ib_mad_agent_private *agent,
642			     struct ib_mad_recv_wc *mad_recv_wc)
643{
644	struct ib_mad_send_wr_private *mad_send_wr;
645	struct ib_rmpp_mad *rmpp_mad;
646	unsigned long flags;
647	int seg_num, newwin, ret;
648
649	rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
650	if (rmpp_mad->rmpp_hdr.rmpp_status) {
651		abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
652		nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
653		return;
654	}
655
656	seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
657	newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
658	if (newwin < seg_num) {
659		abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
660		nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
661		return;
662	}
663
664	spin_lock_irqsave(&agent->lock, flags);
665	mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
666	if (!mad_send_wr) {
667		if (!seg_num)
668			process_ds_ack(agent, mad_recv_wc, newwin);
669		goto out;	/* Unmatched or DS RMPP ACK */
670	}
671
672	if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) &&
673	    (mad_send_wr->timeout)) {
674		spin_unlock_irqrestore(&agent->lock, flags);
675		ack_ds_ack(agent, mad_recv_wc);
676		return;		/* Repeated ACK for DS RMPP transaction */
677	}
678
679	if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
680	    (!mad_send_wr->timeout) || (mad_send_wr->status != IB_WC_SUCCESS))
681		goto out;	/* Send is already done */
682
683	if (seg_num > mad_send_wr->send_buf.seg_count ||
684	    seg_num > mad_send_wr->newwin) {
685		spin_unlock_irqrestore(&agent->lock, flags);
686		abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
687		nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
688		return;
689	}
690
691	if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack)
692		goto out;	/* Old ACK */
693
694	if (seg_num > mad_send_wr->last_ack) {
695		adjust_last_ack(mad_send_wr, seg_num);
696		mad_send_wr->retries_left = mad_send_wr->max_retries;
697	}
698	mad_send_wr->newwin = newwin;
699	if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
700		/* If no response is expected, the ACK completes the send */
701		if (!mad_send_wr->send_buf.timeout_ms) {
702			struct ib_mad_send_wc wc;
703
704			ib_mark_mad_done(mad_send_wr);
705			spin_unlock_irqrestore(&agent->lock, flags);
706
707			wc.status = IB_WC_SUCCESS;
708			wc.vendor_err = 0;
709			wc.send_buf = &mad_send_wr->send_buf;
710			ib_mad_complete_send_wr(mad_send_wr, &wc);
711			return;
712		}
713		if (mad_send_wr->refcount == 1)
714			ib_reset_mad_timeout(mad_send_wr,
715					     mad_send_wr->send_buf.timeout_ms);
716		spin_unlock_irqrestore(&agent->lock, flags);
717		ack_ds_ack(agent, mad_recv_wc);
718		return;
719	} else if (mad_send_wr->refcount == 1 &&
720		   mad_send_wr->seg_num < mad_send_wr->newwin &&
721		   mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) {
722		/* Send failure will just result in a timeout/retry */
723		ret = send_next_seg(mad_send_wr);
724		if (ret)
725			goto out;
726
727		mad_send_wr->refcount++;
728		list_move_tail(&mad_send_wr->agent_list,
729			      &mad_send_wr->mad_agent_priv->send_list);
730	}
731out:
732	spin_unlock_irqrestore(&agent->lock, flags);
733}
734
735static struct ib_mad_recv_wc *
736process_rmpp_data(struct ib_mad_agent_private *agent,
737		  struct ib_mad_recv_wc *mad_recv_wc)
738{
739	struct ib_rmpp_hdr *rmpp_hdr;
740	u8 rmpp_status;
741
742	rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr;
743
744	if (rmpp_hdr->rmpp_status) {
745		rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS;
746		goto bad;
747	}
748
749	if (rmpp_hdr->seg_num == cpu_to_be32(1)) {
750		if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) {
751			rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
752			goto bad;
753		}
754		return start_rmpp(agent, mad_recv_wc);
755	} else {
756		if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) {
757			rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
758			goto bad;
759		}
760		return continue_rmpp(agent, mad_recv_wc);
761	}
762bad:
763	nack_recv(agent, mad_recv_wc, rmpp_status);
764	ib_free_recv_mad(mad_recv_wc);
765	return NULL;
766}
767
768static void process_rmpp_stop(struct ib_mad_agent_private *agent,
769			      struct ib_mad_recv_wc *mad_recv_wc)
770{
771	struct ib_rmpp_mad *rmpp_mad;
772
773	rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
774
775	if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) {
776		abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
777		nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
778	} else
779		abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
780}
781
782static void process_rmpp_abort(struct ib_mad_agent_private *agent,
783			       struct ib_mad_recv_wc *mad_recv_wc)
784{
785	struct ib_rmpp_mad *rmpp_mad;
786
787	rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
788
789	if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN ||
790	    rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) {
791		abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
792		nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
793	} else
794		abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
795}
796
797struct ib_mad_recv_wc *
798ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent,
799			struct ib_mad_recv_wc *mad_recv_wc)
800{
801	struct ib_rmpp_mad *rmpp_mad;
802
803	rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
804	if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE))
805		return mad_recv_wc;
806
807	if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) {
808		abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
809		nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
810		goto out;
811	}
812
813	switch (rmpp_mad->rmpp_hdr.rmpp_type) {
814	case IB_MGMT_RMPP_TYPE_DATA:
815		return process_rmpp_data(agent, mad_recv_wc);
816	case IB_MGMT_RMPP_TYPE_ACK:
817		process_rmpp_ack(agent, mad_recv_wc);
818		break;
819	case IB_MGMT_RMPP_TYPE_STOP:
820		process_rmpp_stop(agent, mad_recv_wc);
821		break;
822	case IB_MGMT_RMPP_TYPE_ABORT:
823		process_rmpp_abort(agent, mad_recv_wc);
824		break;
825	default:
826		abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
827		nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
828		break;
829	}
830out:
831	ib_free_recv_mad(mad_recv_wc);
832	return NULL;
833}
834
835static int init_newwin(struct ib_mad_send_wr_private *mad_send_wr)
836{
837	struct ib_mad_agent_private *agent = mad_send_wr->mad_agent_priv;
838	struct ib_mad_hdr *mad_hdr = mad_send_wr->send_buf.mad;
839	struct mad_rmpp_recv *rmpp_recv;
840	struct ib_ah_attr ah_attr;
841	unsigned long flags;
842	int newwin = 1;
843
844	if (!(mad_hdr->method & IB_MGMT_METHOD_RESP))
845		goto out;
846
847	spin_lock_irqsave(&agent->lock, flags);
848	list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
849		if (rmpp_recv->tid != mad_hdr->tid ||
850		    rmpp_recv->mgmt_class != mad_hdr->mgmt_class ||
851		    rmpp_recv->class_version != mad_hdr->class_version ||
852		    (rmpp_recv->method & IB_MGMT_METHOD_RESP))
853			continue;
854
855		if (ib_query_ah(mad_send_wr->send_buf.ah, &ah_attr))
856			continue;
857
858		if (rmpp_recv->slid == ah_attr.dlid) {
859			newwin = rmpp_recv->repwin;
860			break;
861		}
862	}
863	spin_unlock_irqrestore(&agent->lock, flags);
864out:
865	return newwin;
866}
867
868int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
869{
870	struct ib_rmpp_mad *rmpp_mad;
871	int ret;
872
873	rmpp_mad = mad_send_wr->send_buf.mad;
874	if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
875	      IB_MGMT_RMPP_FLAG_ACTIVE))
876		return IB_RMPP_RESULT_UNHANDLED;
877
878	if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) {
879		mad_send_wr->seg_num = 1;
880		return IB_RMPP_RESULT_INTERNAL;
881	}
882
883	mad_send_wr->newwin = init_newwin(mad_send_wr);
884
885	/* We need to wait for the final ACK even if there isn't a response */
886	mad_send_wr->refcount += (mad_send_wr->timeout == 0);
887	ret = send_next_seg(mad_send_wr);
888	if (!ret)
889		return IB_RMPP_RESULT_CONSUMED;
890	return ret;
891}
892
893int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr,
894			    struct ib_mad_send_wc *mad_send_wc)
895{
896	struct ib_rmpp_mad *rmpp_mad;
897	int ret;
898
899	rmpp_mad = mad_send_wr->send_buf.mad;
900	if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
901	      IB_MGMT_RMPP_FLAG_ACTIVE))
902		return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
903
904	if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
905		return IB_RMPP_RESULT_INTERNAL;	 /* ACK, STOP, or ABORT */
906
907	if (mad_send_wc->status != IB_WC_SUCCESS ||
908	    mad_send_wr->status != IB_WC_SUCCESS)
909		return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */
910
911	if (!mad_send_wr->timeout)
912		return IB_RMPP_RESULT_PROCESSED; /* Response received */
913
914	if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
915		mad_send_wr->timeout =
916			msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
917		return IB_RMPP_RESULT_PROCESSED; /* Send done */
918	}
919
920	if (mad_send_wr->seg_num == mad_send_wr->newwin ||
921	    mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count)
922		return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */
923
924	ret = send_next_seg(mad_send_wr);
925	if (ret) {
926		mad_send_wc->status = IB_WC_GENERAL_ERR;
927		return IB_RMPP_RESULT_PROCESSED;
928	}
929	return IB_RMPP_RESULT_CONSUMED;
930}
931
932int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr)
933{
934	struct ib_rmpp_mad *rmpp_mad;
935	int ret;
936
937	rmpp_mad = mad_send_wr->send_buf.mad;
938	if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
939	      IB_MGMT_RMPP_FLAG_ACTIVE))
940		return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
941
942	if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count)
943		return IB_RMPP_RESULT_PROCESSED;
944
945	mad_send_wr->seg_num = mad_send_wr->last_ack;
946	mad_send_wr->cur_seg = mad_send_wr->last_ack_seg;
947
948	ret = send_next_seg(mad_send_wr);
949	if (ret)
950		return IB_RMPP_RESULT_PROCESSED;
951
952	return IB_RMPP_RESULT_CONSUMED;
953}