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/net/rds/iw_cm.c

http://github.com/mirrors/linux
C | 765 lines | 519 code | 117 blank | 129 comment | 66 complexity | eaf8e9ee5b615246013b653dd6fca627 MD5 | raw file
  1/*
  2 * Copyright (c) 2006 Oracle.  All rights reserved.
  3 *
  4 * This software is available to you under a choice of one of two
  5 * licenses.  You may choose to be licensed under the terms of the GNU
  6 * General Public License (GPL) Version 2, available from the file
  7 * COPYING in the main directory of this source tree, or the
  8 * OpenIB.org BSD license below:
  9 *
 10 *     Redistribution and use in source and binary forms, with or
 11 *     without modification, are permitted provided that the following
 12 *     conditions are met:
 13 *
 14 *      - Redistributions of source code must retain the above
 15 *        copyright notice, this list of conditions and the following
 16 *        disclaimer.
 17 *
 18 *      - Redistributions in binary form must reproduce the above
 19 *        copyright notice, this list of conditions and the following
 20 *        disclaimer in the documentation and/or other materials
 21 *        provided with the distribution.
 22 *
 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 30 * SOFTWARE.
 31 *
 32 */
 33#include <linux/kernel.h>
 34#include <linux/in.h>
 35#include <linux/slab.h>
 36#include <linux/vmalloc.h>
 37#include <linux/ratelimit.h>
 38
 39#include "rds.h"
 40#include "iw.h"
 41
 42/*
 43 * Set the selected protocol version
 44 */
 45static void rds_iw_set_protocol(struct rds_connection *conn, unsigned int version)
 46{
 47	conn->c_version = version;
 48}
 49
 50/*
 51 * Set up flow control
 52 */
 53static void rds_iw_set_flow_control(struct rds_connection *conn, u32 credits)
 54{
 55	struct rds_iw_connection *ic = conn->c_transport_data;
 56
 57	if (rds_iw_sysctl_flow_control && credits != 0) {
 58		/* We're doing flow control */
 59		ic->i_flowctl = 1;
 60		rds_iw_send_add_credits(conn, credits);
 61	} else {
 62		ic->i_flowctl = 0;
 63	}
 64}
 65
 66/*
 67 * Connection established.
 68 * We get here for both outgoing and incoming connection.
 69 */
 70void rds_iw_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event)
 71{
 72	const struct rds_iw_connect_private *dp = NULL;
 73	struct rds_iw_connection *ic = conn->c_transport_data;
 74	struct rds_iw_device *rds_iwdev;
 75	int err;
 76
 77	if (event->param.conn.private_data_len) {
 78		dp = event->param.conn.private_data;
 79
 80		rds_iw_set_protocol(conn,
 81				RDS_PROTOCOL(dp->dp_protocol_major,
 82					dp->dp_protocol_minor));
 83		rds_iw_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
 84	}
 85
 86	/* update ib_device with this local ipaddr & conn */
 87	rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
 88	err = rds_iw_update_cm_id(rds_iwdev, ic->i_cm_id);
 89	if (err)
 90		printk(KERN_ERR "rds_iw_update_ipaddr failed (%d)\n", err);
 91	rds_iw_add_conn(rds_iwdev, conn);
 92
 93	/* If the peer gave us the last packet it saw, process this as if
 94	 * we had received a regular ACK. */
 95	if (dp && dp->dp_ack_seq)
 96		rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
 97
 98	printk(KERN_NOTICE "RDS/IW: connected to %pI4<->%pI4 version %u.%u%s\n",
 99			&conn->c_laddr, &conn->c_faddr,
100			RDS_PROTOCOL_MAJOR(conn->c_version),
101			RDS_PROTOCOL_MINOR(conn->c_version),
102			ic->i_flowctl ? ", flow control" : "");
103
104	rds_connect_complete(conn);
105}
106
107static void rds_iw_cm_fill_conn_param(struct rds_connection *conn,
108			struct rdma_conn_param *conn_param,
109			struct rds_iw_connect_private *dp,
110			u32 protocol_version)
111{
112	struct rds_iw_connection *ic = conn->c_transport_data;
113
114	memset(conn_param, 0, sizeof(struct rdma_conn_param));
115	/* XXX tune these? */
116	conn_param->responder_resources = 1;
117	conn_param->initiator_depth = 1;
118
119	if (dp) {
120		memset(dp, 0, sizeof(*dp));
121		dp->dp_saddr = conn->c_laddr;
122		dp->dp_daddr = conn->c_faddr;
123		dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version);
124		dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version);
125		dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IW_SUPPORTED_PROTOCOLS);
126		dp->dp_ack_seq = rds_iw_piggyb_ack(ic);
127
128		/* Advertise flow control */
129		if (ic->i_flowctl) {
130			unsigned int credits;
131
132			credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits));
133			dp->dp_credit = cpu_to_be32(credits);
134			atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits);
135		}
136
137		conn_param->private_data = dp;
138		conn_param->private_data_len = sizeof(*dp);
139	}
140}
141
142static void rds_iw_cq_event_handler(struct ib_event *event, void *data)
143{
144	rdsdebug("event %u data %p\n", event->event, data);
145}
146
147static void rds_iw_qp_event_handler(struct ib_event *event, void *data)
148{
149	struct rds_connection *conn = data;
150	struct rds_iw_connection *ic = conn->c_transport_data;
151
152	rdsdebug("conn %p ic %p event %u\n", conn, ic, event->event);
153
154	switch (event->event) {
155	case IB_EVENT_COMM_EST:
156		rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
157		break;
158	case IB_EVENT_QP_REQ_ERR:
159	case IB_EVENT_QP_FATAL:
160	default:
161		rdsdebug("Fatal QP Event %u "
162			"- connection %pI4->%pI4, reconnecting\n",
163			event->event, &conn->c_laddr,
164			&conn->c_faddr);
165		rds_conn_drop(conn);
166		break;
167	}
168}
169
170/*
171 * Create a QP
172 */
173static int rds_iw_init_qp_attrs(struct ib_qp_init_attr *attr,
174		struct rds_iw_device *rds_iwdev,
175		struct rds_iw_work_ring *send_ring,
176		void (*send_cq_handler)(struct ib_cq *, void *),
177		struct rds_iw_work_ring *recv_ring,
178		void (*recv_cq_handler)(struct ib_cq *, void *),
179		void *context)
180{
181	struct ib_device *dev = rds_iwdev->dev;
182	unsigned int send_size, recv_size;
183	int ret;
184
185	/* The offset of 1 is to accommodate the additional ACK WR. */
186	send_size = min_t(unsigned int, rds_iwdev->max_wrs, rds_iw_sysctl_max_send_wr + 1);
187	recv_size = min_t(unsigned int, rds_iwdev->max_wrs, rds_iw_sysctl_max_recv_wr + 1);
188	rds_iw_ring_resize(send_ring, send_size - 1);
189	rds_iw_ring_resize(recv_ring, recv_size - 1);
190
191	memset(attr, 0, sizeof(*attr));
192	attr->event_handler = rds_iw_qp_event_handler;
193	attr->qp_context = context;
194	attr->cap.max_send_wr = send_size;
195	attr->cap.max_recv_wr = recv_size;
196	attr->cap.max_send_sge = rds_iwdev->max_sge;
197	attr->cap.max_recv_sge = RDS_IW_RECV_SGE;
198	attr->sq_sig_type = IB_SIGNAL_REQ_WR;
199	attr->qp_type = IB_QPT_RC;
200
201	attr->send_cq = ib_create_cq(dev, send_cq_handler,
202				     rds_iw_cq_event_handler,
203				     context, send_size, 0);
204	if (IS_ERR(attr->send_cq)) {
205		ret = PTR_ERR(attr->send_cq);
206		attr->send_cq = NULL;
207		rdsdebug("ib_create_cq send failed: %d\n", ret);
208		goto out;
209	}
210
211	attr->recv_cq = ib_create_cq(dev, recv_cq_handler,
212				     rds_iw_cq_event_handler,
213				     context, recv_size, 0);
214	if (IS_ERR(attr->recv_cq)) {
215		ret = PTR_ERR(attr->recv_cq);
216		attr->recv_cq = NULL;
217		rdsdebug("ib_create_cq send failed: %d\n", ret);
218		goto out;
219	}
220
221	ret = ib_req_notify_cq(attr->send_cq, IB_CQ_NEXT_COMP);
222	if (ret) {
223		rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
224		goto out;
225	}
226
227	ret = ib_req_notify_cq(attr->recv_cq, IB_CQ_SOLICITED);
228	if (ret) {
229		rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
230		goto out;
231	}
232
233out:
234	if (ret) {
235		if (attr->send_cq)
236			ib_destroy_cq(attr->send_cq);
237		if (attr->recv_cq)
238			ib_destroy_cq(attr->recv_cq);
239	}
240	return ret;
241}
242
243/*
244 * This needs to be very careful to not leave IS_ERR pointers around for
245 * cleanup to trip over.
246 */
247static int rds_iw_setup_qp(struct rds_connection *conn)
248{
249	struct rds_iw_connection *ic = conn->c_transport_data;
250	struct ib_device *dev = ic->i_cm_id->device;
251	struct ib_qp_init_attr attr;
252	struct rds_iw_device *rds_iwdev;
253	int ret;
254
255	/* rds_iw_add_one creates a rds_iw_device object per IB device,
256	 * and allocates a protection domain, memory range and MR pool
257	 * for each.  If that fails for any reason, it will not register
258	 * the rds_iwdev at all.
259	 */
260	rds_iwdev = ib_get_client_data(dev, &rds_iw_client);
261	if (!rds_iwdev) {
262		printk_ratelimited(KERN_NOTICE "RDS/IW: No client_data for device %s\n",
263					dev->name);
264		return -EOPNOTSUPP;
265	}
266
267	/* Protection domain and memory range */
268	ic->i_pd = rds_iwdev->pd;
269	ic->i_mr = rds_iwdev->mr;
270
271	ret = rds_iw_init_qp_attrs(&attr, rds_iwdev,
272			&ic->i_send_ring, rds_iw_send_cq_comp_handler,
273			&ic->i_recv_ring, rds_iw_recv_cq_comp_handler,
274			conn);
275	if (ret < 0)
276		goto out;
277
278	ic->i_send_cq = attr.send_cq;
279	ic->i_recv_cq = attr.recv_cq;
280
281	/*
282	 * XXX this can fail if max_*_wr is too large?  Are we supposed
283	 * to back off until we get a value that the hardware can support?
284	 */
285	ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
286	if (ret) {
287		rdsdebug("rdma_create_qp failed: %d\n", ret);
288		goto out;
289	}
290
291	ic->i_send_hdrs = ib_dma_alloc_coherent(dev,
292					   ic->i_send_ring.w_nr *
293						sizeof(struct rds_header),
294					   &ic->i_send_hdrs_dma, GFP_KERNEL);
295	if (!ic->i_send_hdrs) {
296		ret = -ENOMEM;
297		rdsdebug("ib_dma_alloc_coherent send failed\n");
298		goto out;
299	}
300
301	ic->i_recv_hdrs = ib_dma_alloc_coherent(dev,
302					   ic->i_recv_ring.w_nr *
303						sizeof(struct rds_header),
304					   &ic->i_recv_hdrs_dma, GFP_KERNEL);
305	if (!ic->i_recv_hdrs) {
306		ret = -ENOMEM;
307		rdsdebug("ib_dma_alloc_coherent recv failed\n");
308		goto out;
309	}
310
311	ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header),
312				       &ic->i_ack_dma, GFP_KERNEL);
313	if (!ic->i_ack) {
314		ret = -ENOMEM;
315		rdsdebug("ib_dma_alloc_coherent ack failed\n");
316		goto out;
317	}
318
319	ic->i_sends = vmalloc(ic->i_send_ring.w_nr * sizeof(struct rds_iw_send_work));
320	if (!ic->i_sends) {
321		ret = -ENOMEM;
322		rdsdebug("send allocation failed\n");
323		goto out;
324	}
325	rds_iw_send_init_ring(ic);
326
327	ic->i_recvs = vmalloc(ic->i_recv_ring.w_nr * sizeof(struct rds_iw_recv_work));
328	if (!ic->i_recvs) {
329		ret = -ENOMEM;
330		rdsdebug("recv allocation failed\n");
331		goto out;
332	}
333
334	rds_iw_recv_init_ring(ic);
335	rds_iw_recv_init_ack(ic);
336
337	/* Post receive buffers - as a side effect, this will update
338	 * the posted credit count. */
339	rds_iw_recv_refill(conn, GFP_KERNEL, GFP_HIGHUSER, 1);
340
341	rdsdebug("conn %p pd %p mr %p cq %p %p\n", conn, ic->i_pd, ic->i_mr,
342		 ic->i_send_cq, ic->i_recv_cq);
343
344out:
345	return ret;
346}
347
348static u32 rds_iw_protocol_compatible(const struct rds_iw_connect_private *dp)
349{
350	u16 common;
351	u32 version = 0;
352
353	/* rdma_cm private data is odd - when there is any private data in the
354	 * request, we will be given a pretty large buffer without telling us the
355	 * original size. The only way to tell the difference is by looking at
356	 * the contents, which are initialized to zero.
357	 * If the protocol version fields aren't set, this is a connection attempt
358	 * from an older version. This could could be 3.0 or 2.0 - we can't tell.
359	 * We really should have changed this for OFED 1.3 :-( */
360	if (dp->dp_protocol_major == 0)
361		return RDS_PROTOCOL_3_0;
362
363	common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IW_SUPPORTED_PROTOCOLS;
364	if (dp->dp_protocol_major == 3 && common) {
365		version = RDS_PROTOCOL_3_0;
366		while ((common >>= 1) != 0)
367			version++;
368	}
369	printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI4 using "
370			"incompatible protocol version %u.%u\n",
371			&dp->dp_saddr,
372			dp->dp_protocol_major,
373			dp->dp_protocol_minor);
374	return version;
375}
376
377int rds_iw_cm_handle_connect(struct rdma_cm_id *cm_id,
378				    struct rdma_cm_event *event)
379{
380	const struct rds_iw_connect_private *dp = event->param.conn.private_data;
381	struct rds_iw_connect_private dp_rep;
382	struct rds_connection *conn = NULL;
383	struct rds_iw_connection *ic = NULL;
384	struct rdma_conn_param conn_param;
385	struct rds_iw_device *rds_iwdev;
386	u32 version;
387	int err, destroy = 1;
388
389	/* Check whether the remote protocol version matches ours. */
390	version = rds_iw_protocol_compatible(dp);
391	if (!version)
392		goto out;
393
394	rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u\n",
395		 &dp->dp_saddr, &dp->dp_daddr,
396		 RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version));
397
398	conn = rds_conn_create(dp->dp_daddr, dp->dp_saddr, &rds_iw_transport,
399			       GFP_KERNEL);
400	if (IS_ERR(conn)) {
401		rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn));
402		conn = NULL;
403		goto out;
404	}
405
406	/*
407	 * The connection request may occur while the
408	 * previous connection exist, e.g. in case of failover.
409	 * But as connections may be initiated simultaneously
410	 * by both hosts, we have a random backoff mechanism -
411	 * see the comment above rds_queue_reconnect()
412	 */
413	mutex_lock(&conn->c_cm_lock);
414	if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
415		if (rds_conn_state(conn) == RDS_CONN_UP) {
416			rdsdebug("incoming connect while connecting\n");
417			rds_conn_drop(conn);
418			rds_iw_stats_inc(s_iw_listen_closed_stale);
419		} else
420		if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
421			/* Wait and see - our connect may still be succeeding */
422			rds_iw_stats_inc(s_iw_connect_raced);
423		}
424		mutex_unlock(&conn->c_cm_lock);
425		goto out;
426	}
427
428	ic = conn->c_transport_data;
429
430	rds_iw_set_protocol(conn, version);
431	rds_iw_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
432
433	/* If the peer gave us the last packet it saw, process this as if
434	 * we had received a regular ACK. */
435	if (dp->dp_ack_seq)
436		rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
437
438	BUG_ON(cm_id->context);
439	BUG_ON(ic->i_cm_id);
440
441	ic->i_cm_id = cm_id;
442	cm_id->context = conn;
443
444	rds_iwdev = ib_get_client_data(cm_id->device, &rds_iw_client);
445	ic->i_dma_local_lkey = rds_iwdev->dma_local_lkey;
446
447	/* We got halfway through setting up the ib_connection, if we
448	 * fail now, we have to take the long route out of this mess. */
449	destroy = 0;
450
451	err = rds_iw_setup_qp(conn);
452	if (err) {
453		rds_iw_conn_error(conn, "rds_iw_setup_qp failed (%d)\n", err);
454		mutex_unlock(&conn->c_cm_lock);
455		goto out;
456	}
457
458	rds_iw_cm_fill_conn_param(conn, &conn_param, &dp_rep, version);
459
460	/* rdma_accept() calls rdma_reject() internally if it fails */
461	err = rdma_accept(cm_id, &conn_param);
462	mutex_unlock(&conn->c_cm_lock);
463	if (err) {
464		rds_iw_conn_error(conn, "rdma_accept failed (%d)\n", err);
465		goto out;
466	}
467
468	return 0;
469
470out:
471	rdma_reject(cm_id, NULL, 0);
472	return destroy;
473}
474
475
476int rds_iw_cm_initiate_connect(struct rdma_cm_id *cm_id)
477{
478	struct rds_connection *conn = cm_id->context;
479	struct rds_iw_connection *ic = conn->c_transport_data;
480	struct rdma_conn_param conn_param;
481	struct rds_iw_connect_private dp;
482	int ret;
483
484	/* If the peer doesn't do protocol negotiation, we must
485	 * default to RDSv3.0 */
486	rds_iw_set_protocol(conn, RDS_PROTOCOL_3_0);
487	ic->i_flowctl = rds_iw_sysctl_flow_control;	/* advertise flow control */
488
489	ret = rds_iw_setup_qp(conn);
490	if (ret) {
491		rds_iw_conn_error(conn, "rds_iw_setup_qp failed (%d)\n", ret);
492		goto out;
493	}
494
495	rds_iw_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION);
496
497	ret = rdma_connect(cm_id, &conn_param);
498	if (ret)
499		rds_iw_conn_error(conn, "rdma_connect failed (%d)\n", ret);
500
501out:
502	/* Beware - returning non-zero tells the rdma_cm to destroy
503	 * the cm_id. We should certainly not do it as long as we still
504	 * "own" the cm_id. */
505	if (ret) {
506		struct rds_iw_connection *ic = conn->c_transport_data;
507
508		if (ic->i_cm_id == cm_id)
509			ret = 0;
510	}
511	return ret;
512}
513
514int rds_iw_conn_connect(struct rds_connection *conn)
515{
516	struct rds_iw_connection *ic = conn->c_transport_data;
517	struct rds_iw_device *rds_iwdev;
518	struct sockaddr_in src, dest;
519	int ret;
520
521	/* XXX I wonder what affect the port space has */
522	/* delegate cm event handler to rdma_transport */
523	ic->i_cm_id = rdma_create_id(rds_rdma_cm_event_handler, conn,
524				     RDMA_PS_TCP, IB_QPT_RC);
525	if (IS_ERR(ic->i_cm_id)) {
526		ret = PTR_ERR(ic->i_cm_id);
527		ic->i_cm_id = NULL;
528		rdsdebug("rdma_create_id() failed: %d\n", ret);
529		goto out;
530	}
531
532	rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
533
534	src.sin_family = AF_INET;
535	src.sin_addr.s_addr = (__force u32)conn->c_laddr;
536	src.sin_port = (__force u16)htons(0);
537
538	/* First, bind to the local address and device. */
539	ret = rdma_bind_addr(ic->i_cm_id, (struct sockaddr *) &src);
540	if (ret) {
541		rdsdebug("rdma_bind_addr(%pI4) failed: %d\n",
542				&conn->c_laddr, ret);
543		rdma_destroy_id(ic->i_cm_id);
544		ic->i_cm_id = NULL;
545		goto out;
546	}
547
548	rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
549	ic->i_dma_local_lkey = rds_iwdev->dma_local_lkey;
550
551	dest.sin_family = AF_INET;
552	dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
553	dest.sin_port = (__force u16)htons(RDS_PORT);
554
555	ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
556				(struct sockaddr *)&dest,
557				RDS_RDMA_RESOLVE_TIMEOUT_MS);
558	if (ret) {
559		rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
560			 ret);
561		rdma_destroy_id(ic->i_cm_id);
562		ic->i_cm_id = NULL;
563	}
564
565out:
566	return ret;
567}
568
569/*
570 * This is so careful about only cleaning up resources that were built up
571 * so that it can be called at any point during startup.  In fact it
572 * can be called multiple times for a given connection.
573 */
574void rds_iw_conn_shutdown(struct rds_connection *conn)
575{
576	struct rds_iw_connection *ic = conn->c_transport_data;
577	int err = 0;
578	struct ib_qp_attr qp_attr;
579
580	rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
581		 ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
582		 ic->i_cm_id ? ic->i_cm_id->qp : NULL);
583
584	if (ic->i_cm_id) {
585		struct ib_device *dev = ic->i_cm_id->device;
586
587		rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
588		err = rdma_disconnect(ic->i_cm_id);
589		if (err) {
590			/* Actually this may happen quite frequently, when
591			 * an outgoing connect raced with an incoming connect.
592			 */
593			rdsdebug("rds_iw_conn_shutdown: failed to disconnect,"
594				   " cm: %p err %d\n", ic->i_cm_id, err);
595		}
596
597		if (ic->i_cm_id->qp) {
598			qp_attr.qp_state = IB_QPS_ERR;
599			ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE);
600		}
601
602		wait_event(rds_iw_ring_empty_wait,
603			rds_iw_ring_empty(&ic->i_send_ring) &&
604			rds_iw_ring_empty(&ic->i_recv_ring));
605
606		if (ic->i_send_hdrs)
607			ib_dma_free_coherent(dev,
608					   ic->i_send_ring.w_nr *
609						sizeof(struct rds_header),
610					   ic->i_send_hdrs,
611					   ic->i_send_hdrs_dma);
612
613		if (ic->i_recv_hdrs)
614			ib_dma_free_coherent(dev,
615					   ic->i_recv_ring.w_nr *
616						sizeof(struct rds_header),
617					   ic->i_recv_hdrs,
618					   ic->i_recv_hdrs_dma);
619
620		if (ic->i_ack)
621			ib_dma_free_coherent(dev, sizeof(struct rds_header),
622					     ic->i_ack, ic->i_ack_dma);
623
624		if (ic->i_sends)
625			rds_iw_send_clear_ring(ic);
626		if (ic->i_recvs)
627			rds_iw_recv_clear_ring(ic);
628
629		if (ic->i_cm_id->qp)
630			rdma_destroy_qp(ic->i_cm_id);
631		if (ic->i_send_cq)
632			ib_destroy_cq(ic->i_send_cq);
633		if (ic->i_recv_cq)
634			ib_destroy_cq(ic->i_recv_cq);
635
636		/*
637		 * If associated with an rds_iw_device:
638		 * 	Move connection back to the nodev list.
639		 * 	Remove cm_id from the device cm_id list.
640		 */
641		if (ic->rds_iwdev)
642			rds_iw_remove_conn(ic->rds_iwdev, conn);
643
644		rdma_destroy_id(ic->i_cm_id);
645
646		ic->i_cm_id = NULL;
647		ic->i_pd = NULL;
648		ic->i_mr = NULL;
649		ic->i_send_cq = NULL;
650		ic->i_recv_cq = NULL;
651		ic->i_send_hdrs = NULL;
652		ic->i_recv_hdrs = NULL;
653		ic->i_ack = NULL;
654	}
655	BUG_ON(ic->rds_iwdev);
656
657	/* Clear pending transmit */
658	if (ic->i_rm) {
659		rds_message_put(ic->i_rm);
660		ic->i_rm = NULL;
661	}
662
663	/* Clear the ACK state */
664	clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
665#ifdef KERNEL_HAS_ATOMIC64
666	atomic64_set(&ic->i_ack_next, 0);
667#else
668	ic->i_ack_next = 0;
669#endif
670	ic->i_ack_recv = 0;
671
672	/* Clear flow control state */
673	ic->i_flowctl = 0;
674	atomic_set(&ic->i_credits, 0);
675
676	rds_iw_ring_init(&ic->i_send_ring, rds_iw_sysctl_max_send_wr);
677	rds_iw_ring_init(&ic->i_recv_ring, rds_iw_sysctl_max_recv_wr);
678
679	if (ic->i_iwinc) {
680		rds_inc_put(&ic->i_iwinc->ii_inc);
681		ic->i_iwinc = NULL;
682	}
683
684	vfree(ic->i_sends);
685	ic->i_sends = NULL;
686	vfree(ic->i_recvs);
687	ic->i_recvs = NULL;
688	rdsdebug("shutdown complete\n");
689}
690
691int rds_iw_conn_alloc(struct rds_connection *conn, gfp_t gfp)
692{
693	struct rds_iw_connection *ic;
694	unsigned long flags;
695
696	/* XXX too lazy? */
697	ic = kzalloc(sizeof(struct rds_iw_connection), gfp);
698	if (!ic)
699		return -ENOMEM;
700
701	INIT_LIST_HEAD(&ic->iw_node);
702	tasklet_init(&ic->i_recv_tasklet, rds_iw_recv_tasklet_fn,
703		     (unsigned long) ic);
704	mutex_init(&ic->i_recv_mutex);
705#ifndef KERNEL_HAS_ATOMIC64
706	spin_lock_init(&ic->i_ack_lock);
707#endif
708
709	/*
710	 * rds_iw_conn_shutdown() waits for these to be emptied so they
711	 * must be initialized before it can be called.
712	 */
713	rds_iw_ring_init(&ic->i_send_ring, rds_iw_sysctl_max_send_wr);
714	rds_iw_ring_init(&ic->i_recv_ring, rds_iw_sysctl_max_recv_wr);
715
716	ic->conn = conn;
717	conn->c_transport_data = ic;
718
719	spin_lock_irqsave(&iw_nodev_conns_lock, flags);
720	list_add_tail(&ic->iw_node, &iw_nodev_conns);
721	spin_unlock_irqrestore(&iw_nodev_conns_lock, flags);
722
723
724	rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
725	return 0;
726}
727
728/*
729 * Free a connection. Connection must be shut down and not set for reconnect.
730 */
731void rds_iw_conn_free(void *arg)
732{
733	struct rds_iw_connection *ic = arg;
734	spinlock_t	*lock_ptr;
735
736	rdsdebug("ic %p\n", ic);
737
738	/*
739	 * Conn is either on a dev's list or on the nodev list.
740	 * A race with shutdown() or connect() would cause problems
741	 * (since rds_iwdev would change) but that should never happen.
742	 */
743	lock_ptr = ic->rds_iwdev ? &ic->rds_iwdev->spinlock : &iw_nodev_conns_lock;
744
745	spin_lock_irq(lock_ptr);
746	list_del(&ic->iw_node);
747	spin_unlock_irq(lock_ptr);
748
749	kfree(ic);
750}
751
752/*
753 * An error occurred on the connection
754 */
755void
756__rds_iw_conn_error(struct rds_connection *conn, const char *fmt, ...)
757{
758	va_list ap;
759
760	rds_conn_drop(conn);
761
762	va_start(ap, fmt);
763	vprintk(fmt, ap);
764	va_end(ap);
765}