aboutsummaryrefslogtreecommitdiffstats
path: root/net/rds/ib_cm.c
diff options
context:
space:
mode:
authorAndy Grover <andy.grover@oracle.com>2009-02-24 10:30:30 -0500
committerDavid S. Miller <davem@davemloft.net>2009-02-27 02:39:30 -0500
commitec16227e14141e4fd7ae76354c09dadfe2449d9e (patch)
tree9a20de7d9a0688d721517c2b38d6be83956c7ca4 /net/rds/ib_cm.c
parenteff5f53bef75c0864a5da06bb688939092b848dc (diff)
RDS/IB: Infiniband transport
Registers as an RDS transport and an IB client, and uses IB CM API to allocate ids, queue pairs, and the rest of that fun stuff. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds/ib_cm.c')
-rw-r--r--net/rds/ib_cm.c726
1 files changed, 726 insertions, 0 deletions
diff --git a/net/rds/ib_cm.c b/net/rds/ib_cm.c
new file mode 100644
index 00000000000..0532237bd12
--- /dev/null
+++ b/net/rds/ib_cm.c
@@ -0,0 +1,726 @@
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 "ib.h"
39
40/*
41 * Set the selected protocol version
42 */
43static void rds_ib_set_protocol(struct rds_connection *conn, unsigned int version)
44{
45 conn->c_version = version;
46}
47
48/*
49 * Set up flow control
50 */
51static void rds_ib_set_flow_control(struct rds_connection *conn, u32 credits)
52{
53 struct rds_ib_connection *ic = conn->c_transport_data;
54
55 if (rds_ib_sysctl_flow_control && credits != 0) {
56 /* We're doing flow control */
57 ic->i_flowctl = 1;
58 rds_ib_send_add_credits(conn, credits);
59 } else {
60 ic->i_flowctl = 0;
61 }
62}
63
64/*
65 * Tune RNR behavior. Without flow control, we use a rather
66 * low timeout, but not the absolute minimum - this should
67 * be tunable.
68 *
69 * We already set the RNR retry count to 7 (which is the
70 * smallest infinite number :-) above.
71 * If flow control is off, we want to change this back to 0
72 * so that we learn quickly when our credit accounting is
73 * buggy.
74 *
75 * Caller passes in a qp_attr pointer - don't waste stack spacv
76 * by allocation this twice.
77 */
78static void
79rds_ib_tune_rnr(struct rds_ib_connection *ic, struct ib_qp_attr *attr)
80{
81 int ret;
82
83 attr->min_rnr_timer = IB_RNR_TIMER_000_32;
84 ret = ib_modify_qp(ic->i_cm_id->qp, attr, IB_QP_MIN_RNR_TIMER);
85 if (ret)
86 printk(KERN_NOTICE "ib_modify_qp(IB_QP_MIN_RNR_TIMER): err=%d\n", -ret);
87}
88
89/*
90 * Connection established.
91 * We get here for both outgoing and incoming connection.
92 */
93void rds_ib_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event)
94{
95 const struct rds_ib_connect_private *dp = NULL;
96 struct rds_ib_connection *ic = conn->c_transport_data;
97 struct rds_ib_device *rds_ibdev;
98 struct ib_qp_attr qp_attr;
99 int err;
100
101 if (event->param.conn.private_data_len) {
102 dp = event->param.conn.private_data;
103
104 rds_ib_set_protocol(conn,
105 RDS_PROTOCOL(dp->dp_protocol_major,
106 dp->dp_protocol_minor));
107 rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
108 }
109
110 printk(KERN_NOTICE "RDS/IB: connected to %pI4 version %u.%u%s\n",
111 &conn->c_laddr,
112 RDS_PROTOCOL_MAJOR(conn->c_version),
113 RDS_PROTOCOL_MINOR(conn->c_version),
114 ic->i_flowctl ? ", flow control" : "");
115
116 /* Tune RNR behavior */
117 rds_ib_tune_rnr(ic, &qp_attr);
118
119 qp_attr.qp_state = IB_QPS_RTS;
120 err = ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE);
121 if (err)
122 printk(KERN_NOTICE "ib_modify_qp(IB_QP_STATE, RTS): err=%d\n", err);
123
124 /* update ib_device with this local ipaddr & conn */
125 rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_client);
126 err = rds_ib_update_ipaddr(rds_ibdev, conn->c_laddr);
127 if (err)
128 printk(KERN_ERR "rds_ib_update_ipaddr failed (%d)\n", err);
129 err = rds_ib_add_conn(rds_ibdev, conn);
130 if (err)
131 printk(KERN_ERR "rds_ib_add_conn failed (%d)\n", err);
132
133 /* If the peer gave us the last packet it saw, process this as if
134 * we had received a regular ACK. */
135 if (dp && dp->dp_ack_seq)
136 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
137
138 rds_connect_complete(conn);
139}
140
141static void rds_ib_cm_fill_conn_param(struct rds_connection *conn,
142 struct rdma_conn_param *conn_param,
143 struct rds_ib_connect_private *dp,
144 u32 protocol_version)
145{
146 memset(conn_param, 0, sizeof(struct rdma_conn_param));
147 /* XXX tune these? */
148 conn_param->responder_resources = 1;
149 conn_param->initiator_depth = 1;
150 conn_param->retry_count = 7;
151 conn_param->rnr_retry_count = 7;
152
153 if (dp) {
154 struct rds_ib_connection *ic = conn->c_transport_data;
155
156 memset(dp, 0, sizeof(*dp));
157 dp->dp_saddr = conn->c_laddr;
158 dp->dp_daddr = conn->c_faddr;
159 dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version);
160 dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version);
161 dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS);
162 dp->dp_ack_seq = rds_ib_piggyb_ack(ic);
163
164 /* Advertise flow control */
165 if (ic->i_flowctl) {
166 unsigned int credits;
167
168 credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits));
169 dp->dp_credit = cpu_to_be32(credits);
170 atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits);
171 }
172
173 conn_param->private_data = dp;
174 conn_param->private_data_len = sizeof(*dp);
175 }
176}
177
178static void rds_ib_cq_event_handler(struct ib_event *event, void *data)
179{
180 rdsdebug("event %u data %p\n", event->event, data);
181}
182
183static void rds_ib_qp_event_handler(struct ib_event *event, void *data)
184{
185 struct rds_connection *conn = data;
186 struct rds_ib_connection *ic = conn->c_transport_data;
187
188 rdsdebug("conn %p ic %p event %u\n", conn, ic, event->event);
189
190 switch (event->event) {
191 case IB_EVENT_COMM_EST:
192 rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
193 break;
194 default:
195 printk(KERN_WARNING "RDS/ib: unhandled QP event %u "
196 "on connection to %pI4\n", event->event,
197 &conn->c_faddr);
198 break;
199 }
200}
201
202/*
203 * This needs to be very careful to not leave IS_ERR pointers around for
204 * cleanup to trip over.
205 */
206static int rds_ib_setup_qp(struct rds_connection *conn)
207{
208 struct rds_ib_connection *ic = conn->c_transport_data;
209 struct ib_device *dev = ic->i_cm_id->device;
210 struct ib_qp_init_attr attr;
211 struct rds_ib_device *rds_ibdev;
212 int ret;
213
214 /* rds_ib_add_one creates a rds_ib_device object per IB device,
215 * and allocates a protection domain, memory range and FMR pool
216 * for each. If that fails for any reason, it will not register
217 * the rds_ibdev at all.
218 */
219 rds_ibdev = ib_get_client_data(dev, &rds_ib_client);
220 if (rds_ibdev == NULL) {
221 if (printk_ratelimit())
222 printk(KERN_NOTICE "RDS/IB: No client_data for device %s\n",
223 dev->name);
224 return -EOPNOTSUPP;
225 }
226
227 if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1)
228 rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1);
229 if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1)
230 rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1);
231
232 /* Protection domain and memory range */
233 ic->i_pd = rds_ibdev->pd;
234 ic->i_mr = rds_ibdev->mr;
235
236 ic->i_send_cq = ib_create_cq(dev, rds_ib_send_cq_comp_handler,
237 rds_ib_cq_event_handler, conn,
238 ic->i_send_ring.w_nr + 1, 0);
239 if (IS_ERR(ic->i_send_cq)) {
240 ret = PTR_ERR(ic->i_send_cq);
241 ic->i_send_cq = NULL;
242 rdsdebug("ib_create_cq send failed: %d\n", ret);
243 goto out;
244 }
245
246 ic->i_recv_cq = ib_create_cq(dev, rds_ib_recv_cq_comp_handler,
247 rds_ib_cq_event_handler, conn,
248 ic->i_recv_ring.w_nr, 0);
249 if (IS_ERR(ic->i_recv_cq)) {
250 ret = PTR_ERR(ic->i_recv_cq);
251 ic->i_recv_cq = NULL;
252 rdsdebug("ib_create_cq recv failed: %d\n", ret);
253 goto out;
254 }
255
256 ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
257 if (ret) {
258 rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
259 goto out;
260 }
261
262 ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
263 if (ret) {
264 rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
265 goto out;
266 }
267
268 /* XXX negotiate max send/recv with remote? */
269 memset(&attr, 0, sizeof(attr));
270 attr.event_handler = rds_ib_qp_event_handler;
271 attr.qp_context = conn;
272 /* + 1 to allow for the single ack message */
273 attr.cap.max_send_wr = ic->i_send_ring.w_nr + 1;
274 attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1;
275 attr.cap.max_send_sge = rds_ibdev->max_sge;
276 attr.cap.max_recv_sge = RDS_IB_RECV_SGE;
277 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
278 attr.qp_type = IB_QPT_RC;
279 attr.send_cq = ic->i_send_cq;
280 attr.recv_cq = ic->i_recv_cq;
281
282 /*
283 * XXX this can fail if max_*_wr is too large? Are we supposed
284 * to back off until we get a value that the hardware can support?
285 */
286 ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
287 if (ret) {
288 rdsdebug("rdma_create_qp failed: %d\n", ret);
289 goto out;
290 }
291
292 ic->i_send_hdrs = ib_dma_alloc_coherent(dev,
293 ic->i_send_ring.w_nr *
294 sizeof(struct rds_header),
295 &ic->i_send_hdrs_dma, GFP_KERNEL);
296 if (ic->i_send_hdrs == NULL) {
297 ret = -ENOMEM;
298 rdsdebug("ib_dma_alloc_coherent send failed\n");
299 goto out;
300 }
301
302 ic->i_recv_hdrs = ib_dma_alloc_coherent(dev,
303 ic->i_recv_ring.w_nr *
304 sizeof(struct rds_header),
305 &ic->i_recv_hdrs_dma, GFP_KERNEL);
306 if (ic->i_recv_hdrs == NULL) {
307 ret = -ENOMEM;
308 rdsdebug("ib_dma_alloc_coherent recv failed\n");
309 goto out;
310 }
311
312 ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header),
313 &ic->i_ack_dma, GFP_KERNEL);
314 if (ic->i_ack == NULL) {
315 ret = -ENOMEM;
316 rdsdebug("ib_dma_alloc_coherent ack failed\n");
317 goto out;
318 }
319
320 ic->i_sends = vmalloc(ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work));
321 if (ic->i_sends == NULL) {
322 ret = -ENOMEM;
323 rdsdebug("send allocation failed\n");
324 goto out;
325 }
326 rds_ib_send_init_ring(ic);
327
328 ic->i_recvs = vmalloc(ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work));
329 if (ic->i_recvs == NULL) {
330 ret = -ENOMEM;
331 rdsdebug("recv allocation failed\n");
332 goto out;
333 }
334
335 rds_ib_recv_init_ring(ic);
336 rds_ib_recv_init_ack(ic);
337
338 /* Post receive buffers - as a side effect, this will update
339 * the posted credit count. */
340 rds_ib_recv_refill(conn, GFP_KERNEL, GFP_HIGHUSER, 1);
341
342 rdsdebug("conn %p pd %p mr %p cq %p %p\n", conn, ic->i_pd, ic->i_mr,
343 ic->i_send_cq, ic->i_recv_cq);
344
345out:
346 return ret;
347}
348
349static u32 rds_ib_protocol_compatible(const struct rds_ib_connect_private *dp)
350{
351 u16 common;
352 u32 version = 0;
353
354 /* rdma_cm private data is odd - when there is any private data in the
355 * request, we will be given a pretty large buffer without telling us the
356 * original size. The only way to tell the difference is by looking at
357 * the contents, which are initialized to zero.
358 * If the protocol version fields aren't set, this is a connection attempt
359 * from an older version. This could could be 3.0 or 2.0 - we can't tell.
360 * We really should have changed this for OFED 1.3 :-( */
361 if (dp->dp_protocol_major == 0)
362 return RDS_PROTOCOL_3_0;
363
364 common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IB_SUPPORTED_PROTOCOLS;
365 if (dp->dp_protocol_major == 3 && common) {
366 version = RDS_PROTOCOL_3_0;
367 while ((common >>= 1) != 0)
368 version++;
369 } else if (printk_ratelimit()) {
370 printk(KERN_NOTICE "RDS: Connection from %pI4 using "
371 "incompatible protocol version %u.%u\n",
372 &dp->dp_saddr,
373 dp->dp_protocol_major,
374 dp->dp_protocol_minor);
375 }
376 return version;
377}
378
379int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
380 struct rdma_cm_event *event)
381{
382 __be64 lguid = cm_id->route.path_rec->sgid.global.interface_id;
383 __be64 fguid = cm_id->route.path_rec->dgid.global.interface_id;
384 const struct rds_ib_connect_private *dp = event->param.conn.private_data;
385 struct rds_ib_connect_private dp_rep;
386 struct rds_connection *conn = NULL;
387 struct rds_ib_connection *ic = NULL;
388 struct rdma_conn_param conn_param;
389 u32 version;
390 int err, destroy = 1;
391
392 /* Check whether the remote protocol version matches ours. */
393 version = rds_ib_protocol_compatible(dp);
394 if (!version)
395 goto out;
396
397 rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u lguid 0x%llx fguid "
398 "0x%llx\n", &dp->dp_saddr, &dp->dp_daddr,
399 RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version),
400 (unsigned long long)be64_to_cpu(lguid),
401 (unsigned long long)be64_to_cpu(fguid));
402
403 conn = rds_conn_create(dp->dp_daddr, dp->dp_saddr, &rds_ib_transport,
404 GFP_KERNEL);
405 if (IS_ERR(conn)) {
406 rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn));
407 conn = NULL;
408 goto out;
409 }
410
411 /*
412 * The connection request may occur while the
413 * previous connection exist, e.g. in case of failover.
414 * But as connections may be initiated simultaneously
415 * by both hosts, we have a random backoff mechanism -
416 * see the comment above rds_queue_reconnect()
417 */
418 mutex_lock(&conn->c_cm_lock);
419 if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
420 if (rds_conn_state(conn) == RDS_CONN_UP) {
421 rdsdebug("incoming connect while connecting\n");
422 rds_conn_drop(conn);
423 rds_ib_stats_inc(s_ib_listen_closed_stale);
424 } else
425 if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
426 /* Wait and see - our connect may still be succeeding */
427 rds_ib_stats_inc(s_ib_connect_raced);
428 }
429 mutex_unlock(&conn->c_cm_lock);
430 goto out;
431 }
432
433 ic = conn->c_transport_data;
434
435 rds_ib_set_protocol(conn, version);
436 rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
437
438 /* If the peer gave us the last packet it saw, process this as if
439 * we had received a regular ACK. */
440 if (dp->dp_ack_seq)
441 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
442
443 BUG_ON(cm_id->context);
444 BUG_ON(ic->i_cm_id);
445
446 ic->i_cm_id = cm_id;
447 cm_id->context = conn;
448
449 /* We got halfway through setting up the ib_connection, if we
450 * fail now, we have to take the long route out of this mess. */
451 destroy = 0;
452
453 err = rds_ib_setup_qp(conn);
454 if (err) {
455 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", err);
456 goto out;
457 }
458
459 rds_ib_cm_fill_conn_param(conn, &conn_param, &dp_rep, version);
460
461 /* rdma_accept() calls rdma_reject() internally if it fails */
462 err = rdma_accept(cm_id, &conn_param);
463 mutex_unlock(&conn->c_cm_lock);
464 if (err) {
465 rds_ib_conn_error(conn, "rdma_accept failed (%d)\n", err);
466 goto out;
467 }
468
469 return 0;
470
471out:
472 rdma_reject(cm_id, NULL, 0);
473 return destroy;
474}
475
476
477int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id)
478{
479 struct rds_connection *conn = cm_id->context;
480 struct rds_ib_connection *ic = conn->c_transport_data;
481 struct rdma_conn_param conn_param;
482 struct rds_ib_connect_private dp;
483 int ret;
484
485 /* If the peer doesn't do protocol negotiation, we must
486 * default to RDSv3.0 */
487 rds_ib_set_protocol(conn, RDS_PROTOCOL_3_0);
488 ic->i_flowctl = rds_ib_sysctl_flow_control; /* advertise flow control */
489
490 ret = rds_ib_setup_qp(conn);
491 if (ret) {
492 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret);
493 goto out;
494 }
495
496 rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION);
497
498 ret = rdma_connect(cm_id, &conn_param);
499 if (ret)
500 rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret);
501
502out:
503 /* Beware - returning non-zero tells the rdma_cm to destroy
504 * the cm_id. We should certainly not do it as long as we still
505 * "own" the cm_id. */
506 if (ret) {
507 if (ic->i_cm_id == cm_id)
508 ret = 0;
509 }
510 return ret;
511}
512
513int rds_ib_conn_connect(struct rds_connection *conn)
514{
515 struct rds_ib_connection *ic = conn->c_transport_data;
516 struct sockaddr_in src, dest;
517 int ret;
518
519 /* XXX I wonder what affect the port space has */
520 /* delegate cm event handler to rdma_transport */
521 ic->i_cm_id = rdma_create_id(rds_rdma_cm_event_handler, conn,
522 RDMA_PS_TCP);
523 if (IS_ERR(ic->i_cm_id)) {
524 ret = PTR_ERR(ic->i_cm_id);
525 ic->i_cm_id = NULL;
526 rdsdebug("rdma_create_id() failed: %d\n", ret);
527 goto out;
528 }
529
530 rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
531
532 src.sin_family = AF_INET;
533 src.sin_addr.s_addr = (__force u32)conn->c_laddr;
534 src.sin_port = (__force u16)htons(0);
535
536 dest.sin_family = AF_INET;
537 dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
538 dest.sin_port = (__force u16)htons(RDS_PORT);
539
540 ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
541 (struct sockaddr *)&dest,
542 RDS_RDMA_RESOLVE_TIMEOUT_MS);
543 if (ret) {
544 rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
545 ret);
546 rdma_destroy_id(ic->i_cm_id);
547 ic->i_cm_id = NULL;
548 }
549
550out:
551 return ret;
552}
553
554/*
555 * This is so careful about only cleaning up resources that were built up
556 * so that it can be called at any point during startup. In fact it
557 * can be called multiple times for a given connection.
558 */
559void rds_ib_conn_shutdown(struct rds_connection *conn)
560{
561 struct rds_ib_connection *ic = conn->c_transport_data;
562 int err = 0;
563
564 rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
565 ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
566 ic->i_cm_id ? ic->i_cm_id->qp : NULL);
567
568 if (ic->i_cm_id) {
569 struct ib_device *dev = ic->i_cm_id->device;
570
571 rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
572 err = rdma_disconnect(ic->i_cm_id);
573 if (err) {
574 /* Actually this may happen quite frequently, when
575 * an outgoing connect raced with an incoming connect.
576 */
577 rdsdebug("failed to disconnect, cm: %p err %d\n",
578 ic->i_cm_id, err);
579 }
580
581 wait_event(rds_ib_ring_empty_wait,
582 rds_ib_ring_empty(&ic->i_send_ring) &&
583 rds_ib_ring_empty(&ic->i_recv_ring));
584
585 if (ic->i_send_hdrs)
586 ib_dma_free_coherent(dev,
587 ic->i_send_ring.w_nr *
588 sizeof(struct rds_header),
589 ic->i_send_hdrs,
590 ic->i_send_hdrs_dma);
591
592 if (ic->i_recv_hdrs)
593 ib_dma_free_coherent(dev,
594 ic->i_recv_ring.w_nr *
595 sizeof(struct rds_header),
596 ic->i_recv_hdrs,
597 ic->i_recv_hdrs_dma);
598
599 if (ic->i_ack)
600 ib_dma_free_coherent(dev, sizeof(struct rds_header),
601 ic->i_ack, ic->i_ack_dma);
602
603 if (ic->i_sends)
604 rds_ib_send_clear_ring(ic);
605 if (ic->i_recvs)
606 rds_ib_recv_clear_ring(ic);
607
608 if (ic->i_cm_id->qp)
609 rdma_destroy_qp(ic->i_cm_id);
610 if (ic->i_send_cq)
611 ib_destroy_cq(ic->i_send_cq);
612 if (ic->i_recv_cq)
613 ib_destroy_cq(ic->i_recv_cq);
614 rdma_destroy_id(ic->i_cm_id);
615
616 /*
617 * Move connection back to the nodev list.
618 */
619 if (ic->rds_ibdev) {
620
621 spin_lock_irq(&ic->rds_ibdev->spinlock);
622 BUG_ON(list_empty(&ic->ib_node));
623 list_del(&ic->ib_node);
624 spin_unlock_irq(&ic->rds_ibdev->spinlock);
625
626 spin_lock_irq(&ib_nodev_conns_lock);
627 list_add_tail(&ic->ib_node, &ib_nodev_conns);
628 spin_unlock_irq(&ib_nodev_conns_lock);
629 ic->rds_ibdev = NULL;
630 }
631
632 ic->i_cm_id = NULL;
633 ic->i_pd = NULL;
634 ic->i_mr = NULL;
635 ic->i_send_cq = NULL;
636 ic->i_recv_cq = NULL;
637 ic->i_send_hdrs = NULL;
638 ic->i_recv_hdrs = NULL;
639 ic->i_ack = NULL;
640 }
641 BUG_ON(ic->rds_ibdev);
642
643 /* Clear pending transmit */
644 if (ic->i_rm) {
645 rds_message_put(ic->i_rm);
646 ic->i_rm = NULL;
647 }
648
649 /* Clear the ACK state */
650 clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
651 rds_ib_set_64bit(&ic->i_ack_next, 0);
652 ic->i_ack_recv = 0;
653
654 /* Clear flow control state */
655 ic->i_flowctl = 0;
656 atomic_set(&ic->i_credits, 0);
657
658 rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
659 rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
660
661 if (ic->i_ibinc) {
662 rds_inc_put(&ic->i_ibinc->ii_inc);
663 ic->i_ibinc = NULL;
664 }
665
666 vfree(ic->i_sends);
667 ic->i_sends = NULL;
668 vfree(ic->i_recvs);
669 ic->i_recvs = NULL;
670}
671
672int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp)
673{
674 struct rds_ib_connection *ic;
675 unsigned long flags;
676
677 /* XXX too lazy? */
678 ic = kzalloc(sizeof(struct rds_ib_connection), GFP_KERNEL);
679 if (ic == NULL)
680 return -ENOMEM;
681
682 INIT_LIST_HEAD(&ic->ib_node);
683 mutex_init(&ic->i_recv_mutex);
684
685 /*
686 * rds_ib_conn_shutdown() waits for these to be emptied so they
687 * must be initialized before it can be called.
688 */
689 rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
690 rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
691
692 ic->conn = conn;
693 conn->c_transport_data = ic;
694
695 spin_lock_irqsave(&ib_nodev_conns_lock, flags);
696 list_add_tail(&ic->ib_node, &ib_nodev_conns);
697 spin_unlock_irqrestore(&ib_nodev_conns_lock, flags);
698
699
700 rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
701 return 0;
702}
703
704void rds_ib_conn_free(void *arg)
705{
706 struct rds_ib_connection *ic = arg;
707 rdsdebug("ic %p\n", ic);
708 list_del(&ic->ib_node);
709 kfree(ic);
710}
711
712
713/*
714 * An error occurred on the connection
715 */
716void
717__rds_ib_conn_error(struct rds_connection *conn, const char *fmt, ...)
718{
719 va_list ap;
720
721 rds_conn_drop(conn);
722
723 va_start(ap, fmt);
724 vprintk(fmt, ap);
725 va_end(ap);
726}