mad_rmpp.c

  1/*
  2 * Copyright (c) 2005 Intel Inc. All rights reserved.
  3 * Copyright (c) 2005-2006 Voltaire, Inc. All rights reserved.
  4 * Copyright (c) 2014 Intel Corporation.  All rights reserved.
  5 *
  6 * This software is available to you under a choice of one of two
  7 * licenses.  You may choose to be licensed under the terms of the GNU
  8 * General Public License (GPL) Version 2, available from the file
  9 * COPYING in the main directory of this source tree, or the
 10 * OpenIB.org BSD license below:
 11 *
 12 *     Redistribution and use in source and binary forms, with or
 13 *     without modification, are permitted provided that the following
 14 *     conditions are met:
 15 *
 16 *      - Redistributions of source code must retain the above
 17 *        copyright notice, this list of conditions and the following
 18 *        disclaimer.
 19 *
 20 *      - Redistributions in binary form must reproduce the above
 21 *        copyright notice, this list of conditions and the following
 22 *        disclaimer in the documentation and/or other materials
 23 *        provided with the distribution.
 24 *
 25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 32 * SOFTWARE.
 33 */
 34
 35#include <linux/slab.h>
 36
 37#include "mad_priv.h"
 38#include "mad_rmpp.h"
 39
 40enum rmpp_state {
 41	RMPP_STATE_ACTIVE,
 42	RMPP_STATE_TIMEOUT,
 43	RMPP_STATE_COMPLETE
 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	refcount_t refcount;
 55
 56	struct ib_ah *ah;
 57	struct ib_mad_recv_wc *rmpp_wc;
 58	struct ib_mad_recv_buf *cur_seg_buf;
 59	int last_ack;
 60	int seg_num;
 61	int newwin;
 62	int repwin;
 63
 64	__be64 tid;
 65	u32 src_qp;
 66	u32 slid;
 67	u8 mgmt_class;
 68	u8 class_version;
 69	u8 method;
 70	u8 base_version;
 71};
 72
 73static inline void deref_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
 74{
 75	if (refcount_dec_and_test(&rmpp_recv->refcount))
 76		complete(&rmpp_recv->comp);
 77}
 78
 79static void destroy_rmpp_recv(struct mad_rmpp_recv *rmpp_recv)
 80{
 81	deref_rmpp_recv(rmpp_recv);
 82	wait_for_completion(&rmpp_recv->comp);
 83	rdma_destroy_ah(rmpp_recv->ah, RDMA_DESTROY_AH_SLEEPABLE);
 84	kfree(rmpp_recv);
 85}
 86
 87void ib_cancel_rmpp_recvs(struct ib_mad_agent_private *agent)
 88{
 89	struct mad_rmpp_recv *rmpp_recv, *temp_rmpp_recv;
 90	unsigned long flags;
 91
 92	spin_lock_irqsave(&agent->lock, flags);
 93	list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
 94		cancel_delayed_work(&rmpp_recv->timeout_work);
 95		cancel_delayed_work(&rmpp_recv->cleanup_work);
 96	}
 97	spin_unlock_irqrestore(&agent->lock, flags);
 98
 99	flush_workqueue(agent->qp_info->port_priv->wq);
100
101	list_for_each_entry_safe(rmpp_recv, temp_rmpp_recv,
102				 &agent->rmpp_list, list) {
103		list_del(&rmpp_recv->list);
104		if (rmpp_recv->state != RMPP_STATE_COMPLETE)
105			ib_free_recv_mad(rmpp_recv->rmpp_wc);
106		destroy_rmpp_recv(rmpp_recv);
107	}
108}
109
110static void format_ack(struct ib_mad_send_buf *msg,
111		       struct ib_rmpp_mad *data,
112		       struct mad_rmpp_recv *rmpp_recv)
113{
114	struct ib_rmpp_mad *ack = msg->mad;
115	unsigned long flags;
116
117	memcpy(ack, &data->mad_hdr, msg->hdr_len);
118
119	ack->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
120	ack->rmpp_hdr.rmpp_type = IB_MGMT_RMPP_TYPE_ACK;
121	ib_set_rmpp_flags(&ack->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
122
123	spin_lock_irqsave(&rmpp_recv->lock, flags);
124	rmpp_recv->last_ack = rmpp_recv->seg_num;
125	ack->rmpp_hdr.seg_num = cpu_to_be32(rmpp_recv->seg_num);
126	ack->rmpp_hdr.paylen_newwin = cpu_to_be32(rmpp_recv->newwin);
127	spin_unlock_irqrestore(&rmpp_recv->lock, flags);
128}
129
130static void ack_recv(struct mad_rmpp_recv *rmpp_recv,
131		     struct ib_mad_recv_wc *recv_wc)
132{
133	struct ib_mad_send_buf *msg;
134	int ret, hdr_len;
135
136	hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
137	msg = ib_create_send_mad(&rmpp_recv->agent->agent, recv_wc->wc->src_qp,
138				 recv_wc->wc->pkey_index, 1, hdr_len,
139				 0, GFP_KERNEL,
140				 IB_MGMT_BASE_VERSION);
141	if (IS_ERR(msg))
142		return;
143
144	format_ack(msg, (struct ib_rmpp_mad *) recv_wc->recv_buf.mad, rmpp_recv);
145	msg->ah = rmpp_recv->ah;
146	ret = ib_post_send_mad(msg, NULL);
147	if (ret)
148		ib_free_send_mad(msg);
149}
150
151static struct ib_mad_send_buf *alloc_response_msg(struct ib_mad_agent *agent,
152						  struct ib_mad_recv_wc *recv_wc)
153{
154	struct ib_mad_send_buf *msg;
155	struct ib_ah *ah;
156	int hdr_len;
157
158	ah = ib_create_ah_from_wc(agent->qp->pd, recv_wc->wc,
159				  recv_wc->recv_buf.grh, agent->port_num);
160	if (IS_ERR(ah))
161		return ERR_CAST(ah);
162
163	hdr_len = ib_get_mad_data_offset(recv_wc->recv_buf.mad->mad_hdr.mgmt_class);
164	msg = ib_create_send_mad(agent, recv_wc->wc->src_qp,
165				 recv_wc->wc->pkey_index, 1,
166				 hdr_len, 0, GFP_KERNEL,
167				 IB_MGMT_BASE_VERSION);
168	if (IS_ERR(msg))
169		rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);
170	else {
171		msg->ah = ah;
172		msg->context[0] = ah;
173	}
174
175	return msg;
176}
177
178static void ack_ds_ack(struct ib_mad_agent_private *agent,
179		       struct ib_mad_recv_wc *recv_wc)
180{
181	struct ib_mad_send_buf *msg;
182	struct ib_rmpp_mad *rmpp_mad;
183	int ret;
184
185	msg = alloc_response_msg(&agent->agent, recv_wc);
186	if (IS_ERR(msg))
187		return;
188
189	rmpp_mad = msg->mad;
190	memcpy(rmpp_mad, recv_wc->recv_buf.mad, msg->hdr_len);
191
192	rmpp_mad->mad_hdr.method ^= IB_MGMT_METHOD_RESP;
193	ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
194	rmpp_mad->rmpp_hdr.seg_num = 0;
195	rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(1);
196
197	ret = ib_post_send_mad(msg, NULL);
198	if (ret) {
199		rdma_destroy_ah(msg->ah, RDMA_DESTROY_AH_SLEEPABLE);
200		ib_free_send_mad(msg);
201	}
202}
203
204void ib_rmpp_send_handler(struct ib_mad_send_wc *mad_send_wc)
205{
206	if (mad_send_wc->send_buf->context[0] == mad_send_wc->send_buf->ah)
207		rdma_destroy_ah(mad_send_wc->send_buf->ah,
208				RDMA_DESTROY_AH_SLEEPABLE);
209	ib_free_send_mad(mad_send_wc->send_buf);
210}
211
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		rdma_destroy_ah(msg->ah, RDMA_DESTROY_AH_SLEEPABLE);
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	list_del(&rmpp_recv->list);
271	spin_unlock_irqrestore(&rmpp_recv->agent->lock, flags);
272	destroy_rmpp_recv(rmpp_recv);
273}
274
275static struct mad_rmpp_recv *
276create_rmpp_recv(struct ib_mad_agent_private *agent,
277		 struct ib_mad_recv_wc *mad_recv_wc)
278{
279	struct mad_rmpp_recv *rmpp_recv;
280	struct ib_mad_hdr *mad_hdr;
281
282	rmpp_recv = kmalloc(sizeof *rmpp_recv, GFP_KERNEL);
283	if (!rmpp_recv)
284		return NULL;
285
286	rmpp_recv->ah = ib_create_ah_from_wc(agent->agent.qp->pd,
287					     mad_recv_wc->wc,
288					     mad_recv_wc->recv_buf.grh,
289					     agent->agent.port_num);
290	if (IS_ERR(rmpp_recv->ah))
291		goto error;
292
293	rmpp_recv->agent = agent;
294	init_completion(&rmpp_recv->comp);
295	INIT_DELAYED_WORK(&rmpp_recv->timeout_work, recv_timeout_handler);
296	INIT_DELAYED_WORK(&rmpp_recv->cleanup_work, recv_cleanup_handler);
297	spin_lock_init(&rmpp_recv->lock);
298	rmpp_recv->state = RMPP_STATE_ACTIVE;
299	refcount_set(&rmpp_recv->refcount, 1);
300
301	rmpp_recv->rmpp_wc = mad_recv_wc;
302	rmpp_recv->cur_seg_buf = &mad_recv_wc->recv_buf;
303	rmpp_recv->newwin = 1;
304	rmpp_recv->seg_num = 1;
305	rmpp_recv->last_ack = 0;
306	rmpp_recv->repwin = 1;
307
308	mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
309	rmpp_recv->tid = mad_hdr->tid;
310	rmpp_recv->src_qp = mad_recv_wc->wc->src_qp;
311	rmpp_recv->slid = mad_recv_wc->wc->slid;
312	rmpp_recv->mgmt_class = mad_hdr->mgmt_class;
313	rmpp_recv->class_version = mad_hdr->class_version;
314	rmpp_recv->method  = mad_hdr->method;
315	rmpp_recv->base_version  = mad_hdr->base_version;
316	return rmpp_recv;
317
318error:	kfree(rmpp_recv);
319	return NULL;
320}
321
322static struct mad_rmpp_recv *
323find_rmpp_recv(struct ib_mad_agent_private *agent,
324	       struct ib_mad_recv_wc *mad_recv_wc)
325{
326	struct mad_rmpp_recv *rmpp_recv;
327	struct ib_mad_hdr *mad_hdr = &mad_recv_wc->recv_buf.mad->mad_hdr;
328
329	list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
330		if (rmpp_recv->tid == mad_hdr->tid &&
331		    rmpp_recv->src_qp == mad_recv_wc->wc->src_qp &&
332		    rmpp_recv->slid == mad_recv_wc->wc->slid &&
333		    rmpp_recv->mgmt_class == mad_hdr->mgmt_class &&
334		    rmpp_recv->class_version == mad_hdr->class_version &&
335		    rmpp_recv->method == mad_hdr->method)
336			return rmpp_recv;
337	}
338	return NULL;
339}
340
341static struct mad_rmpp_recv *
342acquire_rmpp_recv(struct ib_mad_agent_private *agent,
343		  struct ib_mad_recv_wc *mad_recv_wc)
344{
345	struct mad_rmpp_recv *rmpp_recv;
346	unsigned long flags;
347
348	spin_lock_irqsave(&agent->lock, flags);
349	rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
350	if (rmpp_recv)
351		refcount_inc(&rmpp_recv->refcount);
352	spin_unlock_irqrestore(&agent->lock, flags);
353	return rmpp_recv;
354}
355
356static struct mad_rmpp_recv *
357insert_rmpp_recv(struct ib_mad_agent_private *agent,
358		 struct mad_rmpp_recv *rmpp_recv)
359{
360	struct mad_rmpp_recv *cur_rmpp_recv;
361
362	cur_rmpp_recv = find_rmpp_recv(agent, rmpp_recv->rmpp_wc);
363	if (!cur_rmpp_recv)
364		list_add_tail(&rmpp_recv->list, &agent->rmpp_list);
365
366	return cur_rmpp_recv;
367}
368
369static inline int get_last_flag(struct ib_mad_recv_buf *seg)
370{
371	struct ib_rmpp_mad *rmpp_mad;
372
373	rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
374	return ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) & IB_MGMT_RMPP_FLAG_LAST;
375}
376
377static inline int get_seg_num(struct ib_mad_recv_buf *seg)
378{
379	struct ib_rmpp_mad *rmpp_mad;
380
381	rmpp_mad = (struct ib_rmpp_mad *) seg->mad;
382	return be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
383}
384
385static inline struct ib_mad_recv_buf *get_next_seg(struct list_head *rmpp_list,
386						   struct ib_mad_recv_buf *seg)
387{
388	if (seg->list.next == rmpp_list)
389		return NULL;
390
391	return container_of(seg->list.next, struct ib_mad_recv_buf, list);
392}
393
394static inline int window_size(struct ib_mad_agent_private *agent)
395{
396	return max(agent->qp_info->recv_queue.max_active >> 3, 1);
397}
398
399static struct ib_mad_recv_buf *find_seg_location(struct list_head *rmpp_list,
400						 int seg_num)
401{
402	struct ib_mad_recv_buf *seg_buf;
403	int cur_seg_num;
404
405	list_for_each_entry_reverse(seg_buf, rmpp_list, list) {
406		cur_seg_num = get_seg_num(seg_buf);
407		if (seg_num > cur_seg_num)
408			return seg_buf;
409		if (seg_num == cur_seg_num)
410			break;
411	}
412	return NULL;
413}
414
415static void update_seg_num(struct mad_rmpp_recv *rmpp_recv,
416			   struct ib_mad_recv_buf *new_buf)
417{
418	struct list_head *rmpp_list = &rmpp_recv->rmpp_wc->rmpp_list;
419
420	while (new_buf && (get_seg_num(new_buf) == rmpp_recv->seg_num + 1)) {
421		rmpp_recv->cur_seg_buf = new_buf;
422		rmpp_recv->seg_num++;
423		new_buf = get_next_seg(rmpp_list, new_buf);
424	}
425}
426
427static inline int get_mad_len(struct mad_rmpp_recv *rmpp_recv)
428{
429	struct ib_rmpp_mad *rmpp_mad;
430	int hdr_size, data_size, pad;
431	bool opa = rdma_cap_opa_mad(rmpp_recv->agent->qp_info->port_priv->device,
432				    rmpp_recv->agent->qp_info->port_priv->port_num);
433
434	rmpp_mad = (struct ib_rmpp_mad *)rmpp_recv->cur_seg_buf->mad;
435
436	hdr_size = ib_get_mad_data_offset(rmpp_mad->mad_hdr.mgmt_class);
437	if (opa && rmpp_recv->base_version == OPA_MGMT_BASE_VERSION) {
438		data_size = sizeof(struct opa_rmpp_mad) - hdr_size;
439		pad = OPA_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
440		if (pad > OPA_MGMT_RMPP_DATA || pad < 0)
441			pad = 0;
442	} else {
443		data_size = sizeof(struct ib_rmpp_mad) - hdr_size;
444		pad = IB_MGMT_RMPP_DATA - be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
445		if (pad > IB_MGMT_RMPP_DATA || pad < 0)
446			pad = 0;
447	}
448
449	return hdr_size + rmpp_recv->seg_num * data_size - pad;
450}
451
452static struct ib_mad_recv_wc *complete_rmpp(struct mad_rmpp_recv *rmpp_recv)
453{
454	struct ib_mad_recv_wc *rmpp_wc;
455
456	ack_recv(rmpp_recv, rmpp_recv->rmpp_wc);
457	if (rmpp_recv->seg_num > 1)
458		cancel_delayed_work(&rmpp_recv->timeout_work);
459
460	rmpp_wc = rmpp_recv->rmpp_wc;
461	rmpp_wc->mad_len = get_mad_len(rmpp_recv);
462	/* 10 seconds until we can find the packet lifetime */
463	queue_delayed_work(rmpp_recv->agent->qp_info->port_priv->wq,
464			   &rmpp_recv->cleanup_work, msecs_to_jiffies(10000));
465	return rmpp_wc;
466}
467
468static struct ib_mad_recv_wc *
469continue_rmpp(struct ib_mad_agent_private *agent,
470	      struct ib_mad_recv_wc *mad_recv_wc)
471{
472	struct mad_rmpp_recv *rmpp_recv;
473	struct ib_mad_recv_buf *prev_buf;
474	struct ib_mad_recv_wc *done_wc;
475	int seg_num;
476	unsigned long flags;
477
478	rmpp_recv = acquire_rmpp_recv(agent, mad_recv_wc);
479	if (!rmpp_recv)
480		goto drop1;
481
482	seg_num = get_seg_num(&mad_recv_wc->recv_buf);
483
484	spin_lock_irqsave(&rmpp_recv->lock, flags);
485	if ((rmpp_recv->state == RMPP_STATE_TIMEOUT) ||
486	    (seg_num > rmpp_recv->newwin))
487		goto drop3;
488
489	if ((seg_num <= rmpp_recv->last_ack) ||
490	    (rmpp_recv->state == RMPP_STATE_COMPLETE)) {
491		spin_unlock_irqrestore(&rmpp_recv->lock, flags);
492		ack_recv(rmpp_recv, mad_recv_wc);
493		goto drop2;
494	}
495
496	prev_buf = find_seg_location(&rmpp_recv->rmpp_wc->rmpp_list, seg_num);
497	if (!prev_buf)
498		goto drop3;
499
500	done_wc = NULL;
501	list_add(&mad_recv_wc->recv_buf.list, &prev_buf->list);
502	if (rmpp_recv->cur_seg_buf == prev_buf) {
503		update_seg_num(rmpp_recv, &mad_recv_wc->recv_buf);
504		if (get_last_flag(rmpp_recv->cur_seg_buf)) {
505			rmpp_recv->state = RMPP_STATE_COMPLETE;
506			spin_unlock_irqrestore(&rmpp_recv->lock, flags);
507			done_wc = complete_rmpp(rmpp_recv);
508			goto out;
509		} else if (rmpp_recv->seg_num == rmpp_recv->newwin) {
510			rmpp_recv->newwin += window_size(agent);
511			spin_unlock_irqrestore(&rmpp_recv->lock, flags);
512			ack_recv(rmpp_recv, mad_recv_wc);
513			goto out;
514		}
515	}
516	spin_unlock_irqrestore(&rmpp_recv->lock, flags);
517out:
518	deref_rmpp_recv(rmpp_recv);
519	return done_wc;
520
521drop3:	spin_unlock_irqrestore(&rmpp_recv->lock, flags);
522drop2:	deref_rmpp_recv(rmpp_recv);
523drop1:	ib_free_recv_mad(mad_recv_wc);
524	return NULL;
525}
526
527static struct ib_mad_recv_wc *
528start_rmpp(struct ib_mad_agent_private *agent,
529	   struct ib_mad_recv_wc *mad_recv_wc)
530{
531	struct mad_rmpp_recv *rmpp_recv;
532	unsigned long flags;
533
534	rmpp_recv = create_rmpp_recv(agent, mad_recv_wc);
535	if (!rmpp_recv) {
536		ib_free_recv_mad(mad_recv_wc);
537		return NULL;
538	}
539
540	spin_lock_irqsave(&agent->lock, flags);
541	if (insert_rmpp_recv(agent, rmpp_recv)) {
542		spin_unlock_irqrestore(&agent->lock, flags);
543		/* duplicate first MAD */
544		destroy_rmpp_recv(rmpp_recv);
545		return continue_rmpp(agent, mad_recv_wc);
546	}
547	refcount_inc(&rmpp_recv->refcount);
548
549	if (get_last_flag(&mad_recv_wc->recv_buf)) {
550		rmpp_recv->state = RMPP_STATE_COMPLETE;
551		spin_unlock_irqrestore(&agent->lock, flags);
552		complete_rmpp(rmpp_recv);
553	} else {
554		spin_unlock_irqrestore(&agent->lock, flags);
555		/* 40 seconds until we can find the packet lifetimes */
556		queue_delayed_work(agent->qp_info->port_priv->wq,
557				   &rmpp_recv->timeout_work,
558				   msecs_to_jiffies(40000));
559		rmpp_recv->newwin += window_size(agent);
560		ack_recv(rmpp_recv, mad_recv_wc);
561		mad_recv_wc = NULL;
562	}
563	deref_rmpp_recv(rmpp_recv);
564	return mad_recv_wc;
565}
566
567static int send_next_seg(struct ib_mad_send_wr_private *mad_send_wr)
568{
569	struct ib_rmpp_mad *rmpp_mad;
570	int timeout;
571	u32 paylen = 0;
572
573	rmpp_mad = mad_send_wr->send_buf.mad;
574	ib_set_rmpp_flags(&rmpp_mad->rmpp_hdr, IB_MGMT_RMPP_FLAG_ACTIVE);
575	rmpp_mad->rmpp_hdr.seg_num = cpu_to_be32(++mad_send_wr->seg_num);
576
577	if (mad_send_wr->seg_num == 1) {
578		rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_FIRST;
579		paylen = (mad_send_wr->send_buf.seg_count *
580			  mad_send_wr->send_buf.seg_rmpp_size) -
581			  mad_send_wr->pad;
582	}
583
584	if (mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count) {
585		rmpp_mad->rmpp_hdr.rmpp_rtime_flags |= IB_MGMT_RMPP_FLAG_LAST;
586		paylen = mad_send_wr->send_buf.seg_rmpp_size - mad_send_wr->pad;
587	}
588	rmpp_mad->rmpp_hdr.paylen_newwin = cpu_to_be32(paylen);
589
590	/* 2 seconds for an ACK until we can find the packet lifetime */
591	timeout = mad_send_wr->send_buf.timeout_ms;
592	if (!timeout || timeout > 2000)
593		mad_send_wr->timeout = msecs_to_jiffies(2000);
594
595	return ib_send_mad(mad_send_wr);
596}
597
598static void abort_send(struct ib_mad_agent_private *agent,
599		       struct ib_mad_recv_wc *mad_recv_wc, u8 rmpp_status)
600{
601	struct ib_mad_send_wr_private *mad_send_wr;
602	struct ib_mad_send_wc wc;
603	unsigned long flags;
604
605	spin_lock_irqsave(&agent->lock, flags);
606	mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
607	if (!mad_send_wr)
608		goto out;	/* Unmatched send */
609
610	if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
611	    (!mad_send_wr->timeout) ||
612	    (mad_send_wr->state == IB_MAD_STATE_CANCELED))
613		goto out;	/* Send is already done */
614
615	ib_mark_mad_done(mad_send_wr);
616	if (mad_send_wr->state == IB_MAD_STATE_DONE) {
617		spin_unlock_irqrestore(&agent->lock, flags);
618		wc.status = IB_WC_REM_ABORT_ERR;
619		wc.vendor_err = rmpp_status;
620		wc.send_buf = &mad_send_wr->send_buf;
621		ib_mad_complete_send_wr(mad_send_wr, &wc);
622		return;
623	}
624	spin_unlock_irqrestore(&agent->lock, flags);
625	return;
626out:
627	spin_unlock_irqrestore(&agent->lock, flags);
628}
629
630static inline void adjust_last_ack(struct ib_mad_send_wr_private *wr,
631				   int seg_num)
632{
633	struct list_head *list;
634
635	wr->last_ack = seg_num;
636	list = &wr->last_ack_seg->list;
637	list_for_each_entry(wr->last_ack_seg, list, list)
638		if (wr->last_ack_seg->num == seg_num)
639			break;
640}
641
642static void process_ds_ack(struct ib_mad_agent_private *agent,
643			   struct ib_mad_recv_wc *mad_recv_wc, int newwin)
644{
645	struct mad_rmpp_recv *rmpp_recv;
646
647	rmpp_recv = find_rmpp_recv(agent, mad_recv_wc);
648	if (rmpp_recv && rmpp_recv->state == RMPP_STATE_COMPLETE)
649		rmpp_recv->repwin = newwin;
650}
651
652static void process_rmpp_ack(struct ib_mad_agent_private *agent,
653			     struct ib_mad_recv_wc *mad_recv_wc)
654{
655	struct ib_mad_send_wr_private *mad_send_wr;
656	struct ib_rmpp_mad *rmpp_mad;
657	unsigned long flags;
658	int seg_num, newwin, ret;
659
660	rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
661	if (rmpp_mad->rmpp_hdr.rmpp_status) {
662		abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
663		nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
664		return;
665	}
666
667	seg_num = be32_to_cpu(rmpp_mad->rmpp_hdr.seg_num);
668	newwin = be32_to_cpu(rmpp_mad->rmpp_hdr.paylen_newwin);
669	if (newwin < seg_num) {
670		abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
671		nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_W2S);
672		return;
673	}
674
675	spin_lock_irqsave(&agent->lock, flags);
676	mad_send_wr = ib_find_send_mad(agent, mad_recv_wc);
677	if (!mad_send_wr) {
678		if (!seg_num)
679			process_ds_ack(agent, mad_recv_wc, newwin);
680		goto out;	/* Unmatched or DS RMPP ACK */
681	}
682
683	if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) &&
684	    (mad_send_wr->timeout)) {
685		spin_unlock_irqrestore(&agent->lock, flags);
686		ack_ds_ack(agent, mad_recv_wc);
687		return;		/* Repeated ACK for DS RMPP transaction */
688	}
689
690	if ((mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) ||
691	    (!mad_send_wr->timeout) ||
692	    (mad_send_wr->state == IB_MAD_STATE_CANCELED))
693		goto out;	/* Send is already done */
694
695	if (seg_num > mad_send_wr->send_buf.seg_count ||
696	    seg_num > mad_send_wr->newwin) {
697		spin_unlock_irqrestore(&agent->lock, flags);
698		abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
699		nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_S2B);
700		return;
701	}
702
703	if (newwin < mad_send_wr->newwin || seg_num < mad_send_wr->last_ack)
704		goto out;	/* Old ACK */
705
706	if (seg_num > mad_send_wr->last_ack) {
707		adjust_last_ack(mad_send_wr, seg_num);
708		mad_send_wr->retries_left = mad_send_wr->max_retries;
709	}
710	mad_send_wr->newwin = newwin;
711	if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
712		/* If no response is expected, the ACK completes the send */
713		if (!mad_send_wr->send_buf.timeout_ms) {
714			struct ib_mad_send_wc wc;
715
716			ib_mark_mad_done(mad_send_wr);
717			if (mad_send_wr->state == IB_MAD_STATE_DONE) {
718				spin_unlock_irqrestore(&agent->lock, flags);
719				wc.status = IB_WC_SUCCESS;
720				wc.vendor_err = 0;
721				wc.send_buf = &mad_send_wr->send_buf;
722				ib_mad_complete_send_wr(mad_send_wr, &wc);
723				return;
724			}
725			spin_unlock_irqrestore(&agent->lock, flags);
726			return;
727		}
728		if (mad_send_wr->state == IB_MAD_STATE_WAIT_RESP)
729			ib_reset_mad_timeout(mad_send_wr,
730					     mad_send_wr->send_buf.timeout_ms);
731		spin_unlock_irqrestore(&agent->lock, flags);
732		ack_ds_ack(agent, mad_recv_wc);
733		return;
734	} else if (mad_send_wr->state == IB_MAD_STATE_WAIT_RESP &&
735		   mad_send_wr->seg_num < mad_send_wr->newwin &&
736		   mad_send_wr->seg_num < mad_send_wr->send_buf.seg_count) {
737		/* Send failure will just result in a timeout/retry */
738		ret = send_next_seg(mad_send_wr);
739		if (ret)
740			goto out;
741
742		change_mad_state(mad_send_wr, IB_MAD_STATE_SEND_START);
743		list_move_tail(&mad_send_wr->agent_list,
744			      &mad_send_wr->mad_agent_priv->send_list);
745	}
746out:
747	spin_unlock_irqrestore(&agent->lock, flags);
748}
749
750static struct ib_mad_recv_wc *
751process_rmpp_data(struct ib_mad_agent_private *agent,
752		  struct ib_mad_recv_wc *mad_recv_wc)
753{
754	struct ib_rmpp_hdr *rmpp_hdr;
755	u8 rmpp_status;
756
757	rmpp_hdr = &((struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad)->rmpp_hdr;
758
759	if (rmpp_hdr->rmpp_status) {
760		rmpp_status = IB_MGMT_RMPP_STATUS_BAD_STATUS;
761		goto bad;
762	}
763
764	if (rmpp_hdr->seg_num == cpu_to_be32(1)) {
765		if (!(ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST)) {
766			rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
767			goto bad;
768		}
769		return start_rmpp(agent, mad_recv_wc);
770	} else {
771		if (ib_get_rmpp_flags(rmpp_hdr) & IB_MGMT_RMPP_FLAG_FIRST) {
772			rmpp_status = IB_MGMT_RMPP_STATUS_BAD_SEG;
773			goto bad;
774		}
775		return continue_rmpp(agent, mad_recv_wc);
776	}
777bad:
778	nack_recv(agent, mad_recv_wc, rmpp_status);
779	ib_free_recv_mad(mad_recv_wc);
780	return NULL;
781}
782
783static void process_rmpp_stop(struct ib_mad_agent_private *agent,
784			      struct ib_mad_recv_wc *mad_recv_wc)
785{
786	struct ib_rmpp_mad *rmpp_mad;
787
788	rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
789
790	if (rmpp_mad->rmpp_hdr.rmpp_status != IB_MGMT_RMPP_STATUS_RESX) {
791		abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
792		nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
793	} else
794		abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
795}
796
797static void process_rmpp_abort(struct ib_mad_agent_private *agent,
798			       struct ib_mad_recv_wc *mad_recv_wc)
799{
800	struct ib_rmpp_mad *rmpp_mad;
801
802	rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
803
804	if (rmpp_mad->rmpp_hdr.rmpp_status < IB_MGMT_RMPP_STATUS_ABORT_MIN ||
805	    rmpp_mad->rmpp_hdr.rmpp_status > IB_MGMT_RMPP_STATUS_ABORT_MAX) {
806		abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
807		nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BAD_STATUS);
808	} else
809		abort_send(agent, mad_recv_wc, rmpp_mad->rmpp_hdr.rmpp_status);
810}
811
812struct ib_mad_recv_wc *
813ib_process_rmpp_recv_wc(struct ib_mad_agent_private *agent,
814			struct ib_mad_recv_wc *mad_recv_wc)
815{
816	struct ib_rmpp_mad *rmpp_mad;
817
818	rmpp_mad = (struct ib_rmpp_mad *)mad_recv_wc->recv_buf.mad;
819	if (!(rmpp_mad->rmpp_hdr.rmpp_rtime_flags & IB_MGMT_RMPP_FLAG_ACTIVE))
820		return mad_recv_wc;
821
822	if (rmpp_mad->rmpp_hdr.rmpp_version != IB_MGMT_RMPP_VERSION) {
823		abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
824		nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_UNV);
825		goto out;
826	}
827
828	switch (rmpp_mad->rmpp_hdr.rmpp_type) {
829	case IB_MGMT_RMPP_TYPE_DATA:
830		return process_rmpp_data(agent, mad_recv_wc);
831	case IB_MGMT_RMPP_TYPE_ACK:
832		process_rmpp_ack(agent, mad_recv_wc);
833		break;
834	case IB_MGMT_RMPP_TYPE_STOP:
835		process_rmpp_stop(agent, mad_recv_wc);
836		break;
837	case IB_MGMT_RMPP_TYPE_ABORT:
838		process_rmpp_abort(agent, mad_recv_wc);
839		break;
840	default:
841		abort_send(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
842		nack_recv(agent, mad_recv_wc, IB_MGMT_RMPP_STATUS_BADT);
843		break;
844	}
845out:
846	ib_free_recv_mad(mad_recv_wc);
847	return NULL;
848}
849
850static int init_newwin(struct ib_mad_send_wr_private *mad_send_wr)
851{
852	struct ib_mad_agent_private *agent = mad_send_wr->mad_agent_priv;
853	struct ib_mad_hdr *mad_hdr = mad_send_wr->send_buf.mad;
854	struct mad_rmpp_recv *rmpp_recv;
855	struct rdma_ah_attr ah_attr;
856	unsigned long flags;
857	int newwin = 1;
858
859	if (!(mad_hdr->method & IB_MGMT_METHOD_RESP))
860		goto out;
861
862	spin_lock_irqsave(&agent->lock, flags);
863	list_for_each_entry(rmpp_recv, &agent->rmpp_list, list) {
864		if (rmpp_recv->tid != mad_hdr->tid ||
865		    rmpp_recv->mgmt_class != mad_hdr->mgmt_class ||
866		    rmpp_recv->class_version != mad_hdr->class_version ||
867		    (rmpp_recv->method & IB_MGMT_METHOD_RESP))
868			continue;
869
870		if (rdma_query_ah(mad_send_wr->send_buf.ah, &ah_attr))
871			continue;
872
873		if (rmpp_recv->slid == rdma_ah_get_dlid(&ah_attr)) {
874			newwin = rmpp_recv->repwin;
875			break;
876		}
877	}
878	spin_unlock_irqrestore(&agent->lock, flags);
879out:
880	return newwin;
881}
882
883int ib_send_rmpp_mad(struct ib_mad_send_wr_private *mad_send_wr)
884{
885	struct ib_rmpp_mad *rmpp_mad;
886	int ret;
887
888	rmpp_mad = mad_send_wr->send_buf.mad;
889	if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
890	      IB_MGMT_RMPP_FLAG_ACTIVE))
891		return IB_RMPP_RESULT_UNHANDLED;
892
893	if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA) {
894		mad_send_wr->seg_num = 1;
895		return IB_RMPP_RESULT_INTERNAL;
896	}
897
898	mad_send_wr->newwin = init_newwin(mad_send_wr);
899
900	/* We need to wait for the final ACK even if there isn't a response */
901	ret = send_next_seg(mad_send_wr);
902	if (!ret)
903		return IB_RMPP_RESULT_CONSUMED;
904	return ret;
905}
906
907int ib_process_rmpp_send_wc(struct ib_mad_send_wr_private *mad_send_wr,
908			    struct ib_mad_send_wc *mad_send_wc)
909{
910	struct ib_rmpp_mad *rmpp_mad;
911	int ret;
912
913	rmpp_mad = mad_send_wr->send_buf.mad;
914	if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
915	      IB_MGMT_RMPP_FLAG_ACTIVE))
916		return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
917
918	if (rmpp_mad->rmpp_hdr.rmpp_type != IB_MGMT_RMPP_TYPE_DATA)
919		return IB_RMPP_RESULT_INTERNAL;	 /* ACK, STOP, or ABORT */
920
921	if (mad_send_wc->status != IB_WC_SUCCESS ||
922	    mad_send_wr->state == IB_MAD_STATE_CANCELED)
923		return IB_RMPP_RESULT_PROCESSED; /* Canceled or send error */
924
925	if (!mad_send_wr->timeout)
926		return IB_RMPP_RESULT_PROCESSED; /* Response received */
927
928	if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count) {
929		mad_send_wr->timeout =
930			msecs_to_jiffies(mad_send_wr->send_buf.timeout_ms);
931		return IB_RMPP_RESULT_PROCESSED; /* Send done */
932	}
933
934	if (mad_send_wr->seg_num == mad_send_wr->newwin ||
935	    mad_send_wr->seg_num == mad_send_wr->send_buf.seg_count)
936		return IB_RMPP_RESULT_PROCESSED; /* Wait for ACK */
937
938	ret = send_next_seg(mad_send_wr);
939	if (ret) {
940		mad_send_wc->status = IB_WC_GENERAL_ERR;
941		return IB_RMPP_RESULT_PROCESSED;
942	}
943	return IB_RMPP_RESULT_CONSUMED;
944}
945
946int ib_retry_rmpp(struct ib_mad_send_wr_private *mad_send_wr)
947{
948	struct ib_rmpp_mad *rmpp_mad;
949	int ret;
950
951	rmpp_mad = mad_send_wr->send_buf.mad;
952	if (!(ib_get_rmpp_flags(&rmpp_mad->rmpp_hdr) &
953	      IB_MGMT_RMPP_FLAG_ACTIVE))
954		return IB_RMPP_RESULT_UNHANDLED; /* RMPP not active */
955
956	if (mad_send_wr->last_ack == mad_send_wr->send_buf.seg_count)
957		return IB_RMPP_RESULT_PROCESSED;
958
959	mad_send_wr->seg_num = mad_send_wr->last_ack;
960	mad_send_wr->cur_seg = mad_send_wr->last_ack_seg;
961
962	ret = send_next_seg(mad_send_wr);
963	if (ret)
964		return IB_RMPP_RESULT_PROCESSED;
965
966	return IB_RMPP_RESULT_CONSUMED;
967}