RDS: Turn down alarming reconnect messages
[linux-2.6.git] / net / rds / iw_cm.c
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/vmalloc.h>
36
37 #include "rds.h"
38 #include "iw.h"
39
40 /*
41  * Set the selected protocol version
42  */
43 static void rds_iw_set_protocol(struct rds_connection *conn, unsigned int version)
44 {
45         conn->c_version = version;
46 }
47
48 /*
49  * Set up flow control
50  */
51 static void rds_iw_set_flow_control(struct rds_connection *conn, u32 credits)
52 {
53         struct rds_iw_connection *ic = conn->c_transport_data;
54
55         if (rds_iw_sysctl_flow_control && credits != 0) {
56                 /* We're doing flow control */
57                 ic->i_flowctl = 1;
58                 rds_iw_send_add_credits(conn, credits);
59         } else {
60                 ic->i_flowctl = 0;
61         }
62 }
63
64 /*
65  * Connection established.
66  * We get here for both outgoing and incoming connection.
67  */
68 void rds_iw_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event)
69 {
70         const struct rds_iw_connect_private *dp = NULL;
71         struct rds_iw_connection *ic = conn->c_transport_data;
72         struct rds_iw_device *rds_iwdev;
73         int err;
74
75         if (event->param.conn.private_data_len) {
76                 dp = event->param.conn.private_data;
77
78                 rds_iw_set_protocol(conn,
79                                 RDS_PROTOCOL(dp->dp_protocol_major,
80                                         dp->dp_protocol_minor));
81                 rds_iw_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
82         }
83
84         /* update ib_device with this local ipaddr & conn */
85         rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
86         err = rds_iw_update_cm_id(rds_iwdev, ic->i_cm_id);
87         if (err)
88                 printk(KERN_ERR "rds_iw_update_ipaddr failed (%d)\n", err);
89         rds_iw_add_conn(rds_iwdev, conn);
90
91         /* If the peer gave us the last packet it saw, process this as if
92          * we had received a regular ACK. */
93         if (dp && dp->dp_ack_seq)
94                 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
95
96         printk(KERN_NOTICE "RDS/IW: connected to %pI4<->%pI4 version %u.%u%s\n",
97                         &conn->c_laddr, &conn->c_faddr,
98                         RDS_PROTOCOL_MAJOR(conn->c_version),
99                         RDS_PROTOCOL_MINOR(conn->c_version),
100                         ic->i_flowctl ? ", flow control" : "");
101
102         rds_connect_complete(conn);
103 }
104
105 static void rds_iw_cm_fill_conn_param(struct rds_connection *conn,
106                         struct rdma_conn_param *conn_param,
107                         struct rds_iw_connect_private *dp,
108                         u32 protocol_version)
109 {
110         struct rds_iw_connection *ic = conn->c_transport_data;
111
112         memset(conn_param, 0, sizeof(struct rdma_conn_param));
113         /* XXX tune these? */
114         conn_param->responder_resources = 1;
115         conn_param->initiator_depth = 1;
116
117         if (dp) {
118                 memset(dp, 0, sizeof(*dp));
119                 dp->dp_saddr = conn->c_laddr;
120                 dp->dp_daddr = conn->c_faddr;
121                 dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version);
122                 dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version);
123                 dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IW_SUPPORTED_PROTOCOLS);
124                 dp->dp_ack_seq = rds_iw_piggyb_ack(ic);
125
126                 /* Advertise flow control */
127                 if (ic->i_flowctl) {
128                         unsigned int credits;
129
130                         credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits));
131                         dp->dp_credit = cpu_to_be32(credits);
132                         atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits);
133                 }
134
135                 conn_param->private_data = dp;
136                 conn_param->private_data_len = sizeof(*dp);
137         }
138 }
139
140 static void rds_iw_cq_event_handler(struct ib_event *event, void *data)
141 {
142         rdsdebug("event %u data %p\n", event->event, data);
143 }
144
145 static void rds_iw_qp_event_handler(struct ib_event *event, void *data)
146 {
147         struct rds_connection *conn = data;
148         struct rds_iw_connection *ic = conn->c_transport_data;
149
150         rdsdebug("conn %p ic %p event %u\n", conn, ic, event->event);
151
152         switch (event->event) {
153         case IB_EVENT_COMM_EST:
154                 rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
155                 break;
156         case IB_EVENT_QP_REQ_ERR:
157         case IB_EVENT_QP_FATAL:
158         default:
159                 rdsdebug("Fatal QP Event %u "
160                         "- connection %pI4->%pI4, reconnecting\n",
161                         event->event, &conn->c_laddr,
162                         &conn->c_faddr);
163                 rds_conn_drop(conn);
164                 break;
165         }
166 }
167
168 /*
169  * Create a QP
170  */
171 static int rds_iw_init_qp_attrs(struct ib_qp_init_attr *attr,
172                 struct rds_iw_device *rds_iwdev,
173                 struct rds_iw_work_ring *send_ring,
174                 void (*send_cq_handler)(struct ib_cq *, void *),
175                 struct rds_iw_work_ring *recv_ring,
176                 void (*recv_cq_handler)(struct ib_cq *, void *),
177                 void *context)
178 {
179         struct ib_device *dev = rds_iwdev->dev;
180         unsigned int send_size, recv_size;
181         int ret;
182
183         /* The offset of 1 is to accomodate the additional ACK WR. */
184         send_size = min_t(unsigned int, rds_iwdev->max_wrs, rds_iw_sysctl_max_send_wr + 1);
185         recv_size = min_t(unsigned int, rds_iwdev->max_wrs, rds_iw_sysctl_max_recv_wr + 1);
186         rds_iw_ring_resize(send_ring, send_size - 1);
187         rds_iw_ring_resize(recv_ring, recv_size - 1);
188
189         memset(attr, 0, sizeof(*attr));
190         attr->event_handler = rds_iw_qp_event_handler;
191         attr->qp_context = context;
192         attr->cap.max_send_wr = send_size;
193         attr->cap.max_recv_wr = recv_size;
194         attr->cap.max_send_sge = rds_iwdev->max_sge;
195         attr->cap.max_recv_sge = RDS_IW_RECV_SGE;
196         attr->sq_sig_type = IB_SIGNAL_REQ_WR;
197         attr->qp_type = IB_QPT_RC;
198
199         attr->send_cq = ib_create_cq(dev, send_cq_handler,
200                                      rds_iw_cq_event_handler,
201                                      context, send_size, 0);
202         if (IS_ERR(attr->send_cq)) {
203                 ret = PTR_ERR(attr->send_cq);
204                 attr->send_cq = NULL;
205                 rdsdebug("ib_create_cq send failed: %d\n", ret);
206                 goto out;
207         }
208
209         attr->recv_cq = ib_create_cq(dev, recv_cq_handler,
210                                      rds_iw_cq_event_handler,
211                                      context, recv_size, 0);
212         if (IS_ERR(attr->recv_cq)) {
213                 ret = PTR_ERR(attr->recv_cq);
214                 attr->recv_cq = NULL;
215                 rdsdebug("ib_create_cq send failed: %d\n", ret);
216                 goto out;
217         }
218
219         ret = ib_req_notify_cq(attr->send_cq, IB_CQ_NEXT_COMP);
220         if (ret) {
221                 rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
222                 goto out;
223         }
224
225         ret = ib_req_notify_cq(attr->recv_cq, IB_CQ_SOLICITED);
226         if (ret) {
227                 rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
228                 goto out;
229         }
230
231 out:
232         if (ret) {
233                 if (attr->send_cq)
234                         ib_destroy_cq(attr->send_cq);
235                 if (attr->recv_cq)
236                         ib_destroy_cq(attr->recv_cq);
237         }
238         return ret;
239 }
240
241 /*
242  * This needs to be very careful to not leave IS_ERR pointers around for
243  * cleanup to trip over.
244  */
245 static int rds_iw_setup_qp(struct rds_connection *conn)
246 {
247         struct rds_iw_connection *ic = conn->c_transport_data;
248         struct ib_device *dev = ic->i_cm_id->device;
249         struct ib_qp_init_attr attr;
250         struct rds_iw_device *rds_iwdev;
251         int ret;
252
253         /* rds_iw_add_one creates a rds_iw_device object per IB device,
254          * and allocates a protection domain, memory range and MR pool
255          * for each.  If that fails for any reason, it will not register
256          * the rds_iwdev at all.
257          */
258         rds_iwdev = ib_get_client_data(dev, &rds_iw_client);
259         if (rds_iwdev == NULL) {
260                 if (printk_ratelimit())
261                         printk(KERN_NOTICE "RDS/IW: No client_data for device %s\n",
262                                         dev->name);
263                 return -EOPNOTSUPP;
264         }
265
266         /* Protection domain and memory range */
267         ic->i_pd = rds_iwdev->pd;
268         ic->i_mr = rds_iwdev->mr;
269
270         ret = rds_iw_init_qp_attrs(&attr, rds_iwdev,
271                         &ic->i_send_ring, rds_iw_send_cq_comp_handler,
272                         &ic->i_recv_ring, rds_iw_recv_cq_comp_handler,
273                         conn);
274         if (ret < 0)
275                 goto out;
276
277         ic->i_send_cq = attr.send_cq;
278         ic->i_recv_cq = attr.recv_cq;
279
280         /*
281          * XXX this can fail if max_*_wr is too large?  Are we supposed
282          * to back off until we get a value that the hardware can support?
283          */
284         ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
285         if (ret) {
286                 rdsdebug("rdma_create_qp failed: %d\n", ret);
287                 goto out;
288         }
289
290         ic->i_send_hdrs = ib_dma_alloc_coherent(dev,
291                                            ic->i_send_ring.w_nr *
292                                                 sizeof(struct rds_header),
293                                            &ic->i_send_hdrs_dma, GFP_KERNEL);
294         if (ic->i_send_hdrs == NULL) {
295                 ret = -ENOMEM;
296                 rdsdebug("ib_dma_alloc_coherent send failed\n");
297                 goto out;
298         }
299
300         ic->i_recv_hdrs = ib_dma_alloc_coherent(dev,
301                                            ic->i_recv_ring.w_nr *
302                                                 sizeof(struct rds_header),
303                                            &ic->i_recv_hdrs_dma, GFP_KERNEL);
304         if (ic->i_recv_hdrs == NULL) {
305                 ret = -ENOMEM;
306                 rdsdebug("ib_dma_alloc_coherent recv failed\n");
307                 goto out;
308         }
309
310         ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header),
311                                        &ic->i_ack_dma, GFP_KERNEL);
312         if (ic->i_ack == NULL) {
313                 ret = -ENOMEM;
314                 rdsdebug("ib_dma_alloc_coherent ack failed\n");
315                 goto out;
316         }
317
318         ic->i_sends = vmalloc(ic->i_send_ring.w_nr * sizeof(struct rds_iw_send_work));
319         if (ic->i_sends == NULL) {
320                 ret = -ENOMEM;
321                 rdsdebug("send allocation failed\n");
322                 goto out;
323         }
324         rds_iw_send_init_ring(ic);
325
326         ic->i_recvs = vmalloc(ic->i_recv_ring.w_nr * sizeof(struct rds_iw_recv_work));
327         if (ic->i_recvs == NULL) {
328                 ret = -ENOMEM;
329                 rdsdebug("recv allocation failed\n");
330                 goto out;
331         }
332
333         rds_iw_recv_init_ring(ic);
334         rds_iw_recv_init_ack(ic);
335
336         /* Post receive buffers - as a side effect, this will update
337          * the posted credit count. */
338         rds_iw_recv_refill(conn, GFP_KERNEL, GFP_HIGHUSER, 1);
339
340         rdsdebug("conn %p pd %p mr %p cq %p %p\n", conn, ic->i_pd, ic->i_mr,
341                  ic->i_send_cq, ic->i_recv_cq);
342
343 out:
344         return ret;
345 }
346
347 static u32 rds_iw_protocol_compatible(const struct rds_iw_connect_private *dp)
348 {
349         u16 common;
350         u32 version = 0;
351
352         /* rdma_cm private data is odd - when there is any private data in the
353          * request, we will be given a pretty large buffer without telling us the
354          * original size. The only way to tell the difference is by looking at
355          * the contents, which are initialized to zero.
356          * If the protocol version fields aren't set, this is a connection attempt
357          * from an older version. This could could be 3.0 or 2.0 - we can't tell.
358          * We really should have changed this for OFED 1.3 :-( */
359         if (dp->dp_protocol_major == 0)
360                 return RDS_PROTOCOL_3_0;
361
362         common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IW_SUPPORTED_PROTOCOLS;
363         if (dp->dp_protocol_major == 3 && common) {
364                 version = RDS_PROTOCOL_3_0;
365                 while ((common >>= 1) != 0)
366                         version++;
367         } else if (printk_ratelimit()) {
368                 printk(KERN_NOTICE "RDS: Connection from %pI4 using "
369                         "incompatible protocol version %u.%u\n",
370                         &dp->dp_saddr,
371                         dp->dp_protocol_major,
372                         dp->dp_protocol_minor);
373         }
374         return version;
375 }
376
377 int 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                 goto out;
455         }
456
457         rds_iw_cm_fill_conn_param(conn, &conn_param, &dp_rep, version);
458
459         /* rdma_accept() calls rdma_reject() internally if it fails */
460         err = rdma_accept(cm_id, &conn_param);
461         mutex_unlock(&conn->c_cm_lock);
462         if (err) {
463                 rds_iw_conn_error(conn, "rdma_accept failed (%d)\n", err);
464                 goto out;
465         }
466
467         return 0;
468
469 out:
470         rdma_reject(cm_id, NULL, 0);
471         return destroy;
472 }
473
474
475 int rds_iw_cm_initiate_connect(struct rdma_cm_id *cm_id)
476 {
477         struct rds_connection *conn = cm_id->context;
478         struct rds_iw_connection *ic = conn->c_transport_data;
479         struct rdma_conn_param conn_param;
480         struct rds_iw_connect_private dp;
481         int ret;
482
483         /* If the peer doesn't do protocol negotiation, we must
484          * default to RDSv3.0 */
485         rds_iw_set_protocol(conn, RDS_PROTOCOL_3_0);
486         ic->i_flowctl = rds_iw_sysctl_flow_control;     /* advertise flow control */
487
488         ret = rds_iw_setup_qp(conn);
489         if (ret) {
490                 rds_iw_conn_error(conn, "rds_iw_setup_qp failed (%d)\n", ret);
491                 goto out;
492         }
493
494         rds_iw_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION);
495
496         ret = rdma_connect(cm_id, &conn_param);
497         if (ret)
498                 rds_iw_conn_error(conn, "rdma_connect failed (%d)\n", ret);
499
500 out:
501         /* Beware - returning non-zero tells the rdma_cm to destroy
502          * the cm_id. We should certainly not do it as long as we still
503          * "own" the cm_id. */
504         if (ret) {
505                 struct rds_iw_connection *ic = conn->c_transport_data;
506
507                 if (ic->i_cm_id == cm_id)
508                         ret = 0;
509         }
510         return ret;
511 }
512
513 int rds_iw_conn_connect(struct rds_connection *conn)
514 {
515         struct rds_iw_connection *ic = conn->c_transport_data;
516         struct rds_iw_device *rds_iwdev;
517         struct sockaddr_in src, dest;
518         int ret;
519
520         /* XXX I wonder what affect the port space has */
521         /* delegate cm event handler to rdma_transport */
522         ic->i_cm_id = rdma_create_id(rds_rdma_cm_event_handler, conn,
523                                      RDMA_PS_TCP);
524         if (IS_ERR(ic->i_cm_id)) {
525                 ret = PTR_ERR(ic->i_cm_id);
526                 ic->i_cm_id = NULL;
527                 rdsdebug("rdma_create_id() failed: %d\n", ret);
528                 goto out;
529         }
530
531         rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
532
533         src.sin_family = AF_INET;
534         src.sin_addr.s_addr = (__force u32)conn->c_laddr;
535         src.sin_port = (__force u16)htons(0);
536
537         /* First, bind to the local address and device. */
538         ret = rdma_bind_addr(ic->i_cm_id, (struct sockaddr *) &src);
539         if (ret) {
540                 rdsdebug("rdma_bind_addr(%pI4) failed: %d\n",
541                                 &conn->c_laddr, ret);
542                 rdma_destroy_id(ic->i_cm_id);
543                 ic->i_cm_id = NULL;
544                 goto out;
545         }
546
547         rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
548         ic->i_dma_local_lkey = rds_iwdev->dma_local_lkey;
549
550         dest.sin_family = AF_INET;
551         dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
552         dest.sin_port = (__force u16)htons(RDS_PORT);
553
554         ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
555                                 (struct sockaddr *)&dest,
556                                 RDS_RDMA_RESOLVE_TIMEOUT_MS);
557         if (ret) {
558                 rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
559                          ret);
560                 rdma_destroy_id(ic->i_cm_id);
561                 ic->i_cm_id = NULL;
562         }
563
564 out:
565         return ret;
566 }
567
568 /*
569  * This is so careful about only cleaning up resources that were built up
570  * so that it can be called at any point during startup.  In fact it
571  * can be called multiple times for a given connection.
572  */
573 void rds_iw_conn_shutdown(struct rds_connection *conn)
574 {
575         struct rds_iw_connection *ic = conn->c_transport_data;
576         int err = 0;
577         struct ib_qp_attr qp_attr;
578
579         rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
580                  ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
581                  ic->i_cm_id ? ic->i_cm_id->qp : NULL);
582
583         if (ic->i_cm_id) {
584                 struct ib_device *dev = ic->i_cm_id->device;
585
586                 rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
587                 err = rdma_disconnect(ic->i_cm_id);
588                 if (err) {
589                         /* Actually this may happen quite frequently, when
590                          * an outgoing connect raced with an incoming connect.
591                          */
592                         rdsdebug("rds_iw_conn_shutdown: failed to disconnect,"
593                                    " cm: %p err %d\n", ic->i_cm_id, err);
594                 }
595
596                 if (ic->i_cm_id->qp) {
597                         qp_attr.qp_state = IB_QPS_ERR;
598                         ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE);
599                 }
600
601                 wait_event(rds_iw_ring_empty_wait,
602                         rds_iw_ring_empty(&ic->i_send_ring) &&
603                         rds_iw_ring_empty(&ic->i_recv_ring));
604
605                 if (ic->i_send_hdrs)
606                         ib_dma_free_coherent(dev,
607                                            ic->i_send_ring.w_nr *
608                                                 sizeof(struct rds_header),
609                                            ic->i_send_hdrs,
610                                            ic->i_send_hdrs_dma);
611
612                 if (ic->i_recv_hdrs)
613                         ib_dma_free_coherent(dev,
614                                            ic->i_recv_ring.w_nr *
615                                                 sizeof(struct rds_header),
616                                            ic->i_recv_hdrs,
617                                            ic->i_recv_hdrs_dma);
618
619                 if (ic->i_ack)
620                         ib_dma_free_coherent(dev, sizeof(struct rds_header),
621                                              ic->i_ack, ic->i_ack_dma);
622
623                 if (ic->i_sends)
624                         rds_iw_send_clear_ring(ic);
625                 if (ic->i_recvs)
626                         rds_iw_recv_clear_ring(ic);
627
628                 if (ic->i_cm_id->qp)
629                         rdma_destroy_qp(ic->i_cm_id);
630                 if (ic->i_send_cq)
631                         ib_destroy_cq(ic->i_send_cq);
632                 if (ic->i_recv_cq)
633                         ib_destroy_cq(ic->i_recv_cq);
634
635                 /*
636                  * If associated with an rds_iw_device:
637                  *      Move connection back to the nodev list.
638                  *      Remove cm_id from the device cm_id list.
639                  */
640                 if (ic->rds_iwdev)
641                         rds_iw_remove_conn(ic->rds_iwdev, conn);
642
643                 rdma_destroy_id(ic->i_cm_id);
644
645                 ic->i_cm_id = NULL;
646                 ic->i_pd = NULL;
647                 ic->i_mr = NULL;
648                 ic->i_send_cq = NULL;
649                 ic->i_recv_cq = NULL;
650                 ic->i_send_hdrs = NULL;
651                 ic->i_recv_hdrs = NULL;
652                 ic->i_ack = NULL;
653         }
654         BUG_ON(ic->rds_iwdev);
655
656         /* Clear pending transmit */
657         if (ic->i_rm) {
658                 rds_message_put(ic->i_rm);
659                 ic->i_rm = NULL;
660         }
661
662         /* Clear the ACK state */
663         clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
664 #ifdef KERNEL_HAS_ATOMIC64
665         atomic64_set(&ic->i_ack_next, 0);
666 #else
667         ic->i_ack_next = 0;
668 #endif
669         ic->i_ack_recv = 0;
670
671         /* Clear flow control state */
672         ic->i_flowctl = 0;
673         atomic_set(&ic->i_credits, 0);
674
675         rds_iw_ring_init(&ic->i_send_ring, rds_iw_sysctl_max_send_wr);
676         rds_iw_ring_init(&ic->i_recv_ring, rds_iw_sysctl_max_recv_wr);
677
678         if (ic->i_iwinc) {
679                 rds_inc_put(&ic->i_iwinc->ii_inc);
680                 ic->i_iwinc = NULL;
681         }
682
683         vfree(ic->i_sends);
684         ic->i_sends = NULL;
685         vfree(ic->i_recvs);
686         ic->i_recvs = NULL;
687         rdsdebug("shutdown complete\n");
688 }
689
690 int rds_iw_conn_alloc(struct rds_connection *conn, gfp_t gfp)
691 {
692         struct rds_iw_connection *ic;
693         unsigned long flags;
694
695         /* XXX too lazy? */
696         ic = kzalloc(sizeof(struct rds_iw_connection), GFP_KERNEL);
697         if (ic == NULL)
698                 return -ENOMEM;
699
700         INIT_LIST_HEAD(&ic->iw_node);
701         tasklet_init(&ic->i_recv_tasklet, rds_iw_recv_tasklet_fn,
702                      (unsigned long) ic);
703         mutex_init(&ic->i_recv_mutex);
704 #ifndef KERNEL_HAS_ATOMIC64
705         spin_lock_init(&ic->i_ack_lock);
706 #endif
707
708         /*
709          * rds_iw_conn_shutdown() waits for these to be emptied so they
710          * must be initialized before it can be called.
711          */
712         rds_iw_ring_init(&ic->i_send_ring, rds_iw_sysctl_max_send_wr);
713         rds_iw_ring_init(&ic->i_recv_ring, rds_iw_sysctl_max_recv_wr);
714
715         ic->conn = conn;
716         conn->c_transport_data = ic;
717
718         spin_lock_irqsave(&iw_nodev_conns_lock, flags);
719         list_add_tail(&ic->iw_node, &iw_nodev_conns);
720         spin_unlock_irqrestore(&iw_nodev_conns_lock, flags);
721
722
723         rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
724         return 0;
725 }
726
727 /*
728  * Free a connection. Connection must be shut down and not set for reconnect.
729  */
730 void rds_iw_conn_free(void *arg)
731 {
732         struct rds_iw_connection *ic = arg;
733         spinlock_t      *lock_ptr;
734
735         rdsdebug("ic %p\n", ic);
736
737         /*
738          * Conn is either on a dev's list or on the nodev list.
739          * A race with shutdown() or connect() would cause problems
740          * (since rds_iwdev would change) but that should never happen.
741          */
742         lock_ptr = ic->rds_iwdev ? &ic->rds_iwdev->spinlock : &iw_nodev_conns_lock;
743
744         spin_lock_irq(lock_ptr);
745         list_del(&ic->iw_node);
746         spin_unlock_irq(lock_ptr);
747
748         kfree(ic);
749 }
750
751 /*
752  * An error occurred on the connection
753  */
754 void
755 __rds_iw_conn_error(struct rds_connection *conn, const char *fmt, ...)
756 {
757         va_list ap;
758
759         rds_conn_drop(conn);
760
761         va_start(ap, fmt);
762         vprintk(fmt, ap);
763         va_end(ap);
764 }