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TOMOYO Linux Cross Reference
Linux/net/rds/iw_cm.c

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  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  */
 45 static 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  */
 53 static 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  */
 70 void 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 
107 static 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 
142 static 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 
147 static 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  */
173 static 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 
233 out:
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  */
247 static 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 
344 out:
345         return ret;
346 }
347 
348 static 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 
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                 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 
470 out:
471         rdma_reject(cm_id, NULL, 0);
472         return destroy;
473 }
474 
475 
476 int 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 
501 out:
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 
514 int 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 
565 out:
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  */
574 void 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("failed to disconnect, cm: %p err %d\n",
594                                  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 
691 int 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  */
731 void 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  */
755 void
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 }
766 

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