blob: c2d372f13dbb022d6b0e9da6d770325fe681a53f [file] [log] [blame]
Andy Groverec162272009-02-24 15:30:30 +00001/*
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
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000101 if (event->param.conn.private_data_len >= sizeof(*dp)) {
Andy Groverec162272009-02-24 15:30:30 +0000102 dp = event->param.conn.private_data;
103
Andy Grover02a6a252009-07-17 13:13:24 +0000104 /* make sure it isn't empty data */
105 if (dp->dp_protocol_major) {
106 rds_ib_set_protocol(conn,
Andy Groverec162272009-02-24 15:30:30 +0000107 RDS_PROTOCOL(dp->dp_protocol_major,
Andy Grover02a6a252009-07-17 13:13:24 +0000108 dp->dp_protocol_minor));
109 rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
110 }
Andy Groverec162272009-02-24 15:30:30 +0000111 }
112
113 printk(KERN_NOTICE "RDS/IB: connected to %pI4 version %u.%u%s\n",
Andy Grover8dacd572009-07-17 13:13:25 +0000114 &conn->c_faddr,
Andy Groverec162272009-02-24 15:30:30 +0000115 RDS_PROTOCOL_MAJOR(conn->c_version),
116 RDS_PROTOCOL_MINOR(conn->c_version),
117 ic->i_flowctl ? ", flow control" : "");
118
Andy Grovere11d9122009-07-17 13:13:29 +0000119 /*
120 * Init rings and fill recv. this needs to wait until protocol negotiation
121 * is complete, since ring layout is different from 3.0 to 3.1.
122 */
123 rds_ib_send_init_ring(ic);
124 rds_ib_recv_init_ring(ic);
125 /* Post receive buffers - as a side effect, this will update
126 * the posted credit count. */
127 rds_ib_recv_refill(conn, GFP_KERNEL, GFP_HIGHUSER, 1);
128
Andy Groverec162272009-02-24 15:30:30 +0000129 /* Tune RNR behavior */
130 rds_ib_tune_rnr(ic, &qp_attr);
131
132 qp_attr.qp_state = IB_QPS_RTS;
133 err = ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE);
134 if (err)
135 printk(KERN_NOTICE "ib_modify_qp(IB_QP_STATE, RTS): err=%d\n", err);
136
137 /* update ib_device with this local ipaddr & conn */
138 rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_client);
139 err = rds_ib_update_ipaddr(rds_ibdev, conn->c_laddr);
140 if (err)
141 printk(KERN_ERR "rds_ib_update_ipaddr failed (%d)\n", err);
Andy Grover745cbcc2009-04-01 08:20:19 +0000142 rds_ib_add_conn(rds_ibdev, conn);
Andy Groverec162272009-02-24 15:30:30 +0000143
144 /* If the peer gave us the last packet it saw, process this as if
145 * we had received a regular ACK. */
146 if (dp && dp->dp_ack_seq)
147 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
148
149 rds_connect_complete(conn);
150}
151
152static void rds_ib_cm_fill_conn_param(struct rds_connection *conn,
153 struct rdma_conn_param *conn_param,
154 struct rds_ib_connect_private *dp,
155 u32 protocol_version)
156{
157 memset(conn_param, 0, sizeof(struct rdma_conn_param));
158 /* XXX tune these? */
159 conn_param->responder_resources = 1;
160 conn_param->initiator_depth = 1;
Andy Grover3ba23ad2009-07-17 13:13:22 +0000161 conn_param->retry_count = min_t(unsigned int, rds_ib_retry_count, 7);
Andy Groverec162272009-02-24 15:30:30 +0000162 conn_param->rnr_retry_count = 7;
163
164 if (dp) {
165 struct rds_ib_connection *ic = conn->c_transport_data;
166
167 memset(dp, 0, sizeof(*dp));
168 dp->dp_saddr = conn->c_laddr;
169 dp->dp_daddr = conn->c_faddr;
170 dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version);
171 dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version);
172 dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS);
173 dp->dp_ack_seq = rds_ib_piggyb_ack(ic);
174
175 /* Advertise flow control */
176 if (ic->i_flowctl) {
177 unsigned int credits;
178
179 credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits));
180 dp->dp_credit = cpu_to_be32(credits);
181 atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits);
182 }
183
184 conn_param->private_data = dp;
185 conn_param->private_data_len = sizeof(*dp);
186 }
187}
188
189static void rds_ib_cq_event_handler(struct ib_event *event, void *data)
190{
191 rdsdebug("event %u data %p\n", event->event, data);
192}
193
194static void rds_ib_qp_event_handler(struct ib_event *event, void *data)
195{
196 struct rds_connection *conn = data;
197 struct rds_ib_connection *ic = conn->c_transport_data;
198
199 rdsdebug("conn %p ic %p event %u\n", conn, ic, event->event);
200
201 switch (event->event) {
202 case IB_EVENT_COMM_EST:
203 rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
204 break;
205 default:
Andy Groverfdf6e6b2009-07-17 13:13:31 +0000206 rds_ib_conn_error(conn, "RDS/IB: Fatal QP Event %u "
207 "- connection %pI4->%pI4, reconnecting\n",
208 event->event, &conn->c_laddr, &conn->c_faddr);
Andy Groverec162272009-02-24 15:30:30 +0000209 break;
210 }
211}
212
213/*
214 * This needs to be very careful to not leave IS_ERR pointers around for
215 * cleanup to trip over.
216 */
217static int rds_ib_setup_qp(struct rds_connection *conn)
218{
219 struct rds_ib_connection *ic = conn->c_transport_data;
220 struct ib_device *dev = ic->i_cm_id->device;
221 struct ib_qp_init_attr attr;
222 struct rds_ib_device *rds_ibdev;
223 int ret;
224
225 /* rds_ib_add_one creates a rds_ib_device object per IB device,
226 * and allocates a protection domain, memory range and FMR pool
227 * for each. If that fails for any reason, it will not register
228 * the rds_ibdev at all.
229 */
230 rds_ibdev = ib_get_client_data(dev, &rds_ib_client);
231 if (rds_ibdev == NULL) {
232 if (printk_ratelimit())
233 printk(KERN_NOTICE "RDS/IB: No client_data for device %s\n",
234 dev->name);
235 return -EOPNOTSUPP;
236 }
237
238 if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1)
239 rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1);
240 if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1)
241 rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1);
242
243 /* Protection domain and memory range */
244 ic->i_pd = rds_ibdev->pd;
245 ic->i_mr = rds_ibdev->mr;
246
247 ic->i_send_cq = ib_create_cq(dev, rds_ib_send_cq_comp_handler,
248 rds_ib_cq_event_handler, conn,
249 ic->i_send_ring.w_nr + 1, 0);
250 if (IS_ERR(ic->i_send_cq)) {
251 ret = PTR_ERR(ic->i_send_cq);
252 ic->i_send_cq = NULL;
253 rdsdebug("ib_create_cq send failed: %d\n", ret);
254 goto out;
255 }
256
257 ic->i_recv_cq = ib_create_cq(dev, rds_ib_recv_cq_comp_handler,
258 rds_ib_cq_event_handler, conn,
259 ic->i_recv_ring.w_nr, 0);
260 if (IS_ERR(ic->i_recv_cq)) {
261 ret = PTR_ERR(ic->i_recv_cq);
262 ic->i_recv_cq = NULL;
263 rdsdebug("ib_create_cq recv failed: %d\n", ret);
264 goto out;
265 }
266
267 ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
268 if (ret) {
269 rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
270 goto out;
271 }
272
273 ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
274 if (ret) {
275 rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
276 goto out;
277 }
278
279 /* XXX negotiate max send/recv with remote? */
280 memset(&attr, 0, sizeof(attr));
281 attr.event_handler = rds_ib_qp_event_handler;
282 attr.qp_context = conn;
283 /* + 1 to allow for the single ack message */
284 attr.cap.max_send_wr = ic->i_send_ring.w_nr + 1;
285 attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1;
286 attr.cap.max_send_sge = rds_ibdev->max_sge;
287 attr.cap.max_recv_sge = RDS_IB_RECV_SGE;
288 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
289 attr.qp_type = IB_QPT_RC;
290 attr.send_cq = ic->i_send_cq;
291 attr.recv_cq = ic->i_recv_cq;
292
293 /*
294 * XXX this can fail if max_*_wr is too large? Are we supposed
295 * to back off until we get a value that the hardware can support?
296 */
297 ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
298 if (ret) {
299 rdsdebug("rdma_create_qp failed: %d\n", ret);
300 goto out;
301 }
302
303 ic->i_send_hdrs = ib_dma_alloc_coherent(dev,
304 ic->i_send_ring.w_nr *
305 sizeof(struct rds_header),
306 &ic->i_send_hdrs_dma, GFP_KERNEL);
307 if (ic->i_send_hdrs == NULL) {
308 ret = -ENOMEM;
309 rdsdebug("ib_dma_alloc_coherent send failed\n");
310 goto out;
311 }
312
313 ic->i_recv_hdrs = ib_dma_alloc_coherent(dev,
314 ic->i_recv_ring.w_nr *
315 sizeof(struct rds_header),
316 &ic->i_recv_hdrs_dma, GFP_KERNEL);
317 if (ic->i_recv_hdrs == NULL) {
318 ret = -ENOMEM;
319 rdsdebug("ib_dma_alloc_coherent recv failed\n");
320 goto out;
321 }
322
323 ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header),
324 &ic->i_ack_dma, GFP_KERNEL);
325 if (ic->i_ack == NULL) {
326 ret = -ENOMEM;
327 rdsdebug("ib_dma_alloc_coherent ack failed\n");
328 goto out;
329 }
330
331 ic->i_sends = vmalloc(ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work));
332 if (ic->i_sends == NULL) {
333 ret = -ENOMEM;
334 rdsdebug("send allocation failed\n");
335 goto out;
336 }
Andy Grovere11d9122009-07-17 13:13:29 +0000337 memset(ic->i_sends, 0, ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work));
Andy Groverec162272009-02-24 15:30:30 +0000338
339 ic->i_recvs = vmalloc(ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work));
340 if (ic->i_recvs == NULL) {
341 ret = -ENOMEM;
342 rdsdebug("recv allocation failed\n");
343 goto out;
344 }
Andy Grovere11d9122009-07-17 13:13:29 +0000345 memset(ic->i_recvs, 0, ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work));
Andy Groverec162272009-02-24 15:30:30 +0000346
Andy Groverec162272009-02-24 15:30:30 +0000347 rds_ib_recv_init_ack(ic);
348
Andy Groverec162272009-02-24 15:30:30 +0000349 rdsdebug("conn %p pd %p mr %p cq %p %p\n", conn, ic->i_pd, ic->i_mr,
350 ic->i_send_cq, ic->i_recv_cq);
351
352out:
353 return ret;
354}
355
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000356static u32 rds_ib_protocol_compatible(struct rdma_cm_event *event)
Andy Groverec162272009-02-24 15:30:30 +0000357{
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000358 const struct rds_ib_connect_private *dp = event->param.conn.private_data;
Andy Groverec162272009-02-24 15:30:30 +0000359 u16 common;
360 u32 version = 0;
361
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000362 /*
363 * rdma_cm private data is odd - when there is any private data in the
Andy Groverec162272009-02-24 15:30:30 +0000364 * request, we will be given a pretty large buffer without telling us the
365 * original size. The only way to tell the difference is by looking at
366 * the contents, which are initialized to zero.
367 * If the protocol version fields aren't set, this is a connection attempt
368 * from an older version. This could could be 3.0 or 2.0 - we can't tell.
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000369 * We really should have changed this for OFED 1.3 :-(
370 */
371
372 /* Be paranoid. RDS always has privdata */
373 if (!event->param.conn.private_data_len) {
374 printk(KERN_NOTICE "RDS incoming connection has no private data, "
375 "rejecting\n");
376 return 0;
377 }
378
379 /* Even if len is crap *now* I still want to check it. -ASG */
380 if (event->param.conn.private_data_len < sizeof (*dp)
381 || dp->dp_protocol_major == 0)
Andy Groverec162272009-02-24 15:30:30 +0000382 return RDS_PROTOCOL_3_0;
383
384 common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IB_SUPPORTED_PROTOCOLS;
385 if (dp->dp_protocol_major == 3 && common) {
386 version = RDS_PROTOCOL_3_0;
387 while ((common >>= 1) != 0)
388 version++;
389 } else if (printk_ratelimit()) {
390 printk(KERN_NOTICE "RDS: Connection from %pI4 using "
391 "incompatible protocol version %u.%u\n",
392 &dp->dp_saddr,
393 dp->dp_protocol_major,
394 dp->dp_protocol_minor);
395 }
396 return version;
397}
398
399int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
400 struct rdma_cm_event *event)
401{
402 __be64 lguid = cm_id->route.path_rec->sgid.global.interface_id;
403 __be64 fguid = cm_id->route.path_rec->dgid.global.interface_id;
404 const struct rds_ib_connect_private *dp = event->param.conn.private_data;
405 struct rds_ib_connect_private dp_rep;
406 struct rds_connection *conn = NULL;
407 struct rds_ib_connection *ic = NULL;
408 struct rdma_conn_param conn_param;
409 u32 version;
410 int err, destroy = 1;
411
412 /* Check whether the remote protocol version matches ours. */
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000413 version = rds_ib_protocol_compatible(event);
Andy Groverec162272009-02-24 15:30:30 +0000414 if (!version)
415 goto out;
416
417 rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u lguid 0x%llx fguid "
418 "0x%llx\n", &dp->dp_saddr, &dp->dp_daddr,
419 RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version),
420 (unsigned long long)be64_to_cpu(lguid),
421 (unsigned long long)be64_to_cpu(fguid));
422
423 conn = rds_conn_create(dp->dp_daddr, dp->dp_saddr, &rds_ib_transport,
424 GFP_KERNEL);
425 if (IS_ERR(conn)) {
426 rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn));
427 conn = NULL;
428 goto out;
429 }
430
431 /*
432 * The connection request may occur while the
433 * previous connection exist, e.g. in case of failover.
434 * But as connections may be initiated simultaneously
435 * by both hosts, we have a random backoff mechanism -
436 * see the comment above rds_queue_reconnect()
437 */
438 mutex_lock(&conn->c_cm_lock);
439 if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
440 if (rds_conn_state(conn) == RDS_CONN_UP) {
441 rdsdebug("incoming connect while connecting\n");
442 rds_conn_drop(conn);
443 rds_ib_stats_inc(s_ib_listen_closed_stale);
444 } else
445 if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
446 /* Wait and see - our connect may still be succeeding */
447 rds_ib_stats_inc(s_ib_connect_raced);
448 }
449 mutex_unlock(&conn->c_cm_lock);
450 goto out;
451 }
452
453 ic = conn->c_transport_data;
454
455 rds_ib_set_protocol(conn, version);
456 rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
457
458 /* If the peer gave us the last packet it saw, process this as if
459 * we had received a regular ACK. */
460 if (dp->dp_ack_seq)
461 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
462
463 BUG_ON(cm_id->context);
464 BUG_ON(ic->i_cm_id);
465
466 ic->i_cm_id = cm_id;
467 cm_id->context = conn;
468
469 /* We got halfway through setting up the ib_connection, if we
470 * fail now, we have to take the long route out of this mess. */
471 destroy = 0;
472
473 err = rds_ib_setup_qp(conn);
474 if (err) {
475 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", err);
476 goto out;
477 }
478
479 rds_ib_cm_fill_conn_param(conn, &conn_param, &dp_rep, version);
480
481 /* rdma_accept() calls rdma_reject() internally if it fails */
482 err = rdma_accept(cm_id, &conn_param);
483 mutex_unlock(&conn->c_cm_lock);
484 if (err) {
485 rds_ib_conn_error(conn, "rdma_accept failed (%d)\n", err);
486 goto out;
487 }
488
489 return 0;
490
491out:
492 rdma_reject(cm_id, NULL, 0);
493 return destroy;
494}
495
496
497int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id)
498{
499 struct rds_connection *conn = cm_id->context;
500 struct rds_ib_connection *ic = conn->c_transport_data;
501 struct rdma_conn_param conn_param;
502 struct rds_ib_connect_private dp;
503 int ret;
504
505 /* If the peer doesn't do protocol negotiation, we must
506 * default to RDSv3.0 */
507 rds_ib_set_protocol(conn, RDS_PROTOCOL_3_0);
508 ic->i_flowctl = rds_ib_sysctl_flow_control; /* advertise flow control */
509
510 ret = rds_ib_setup_qp(conn);
511 if (ret) {
512 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret);
513 goto out;
514 }
515
516 rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION);
517
518 ret = rdma_connect(cm_id, &conn_param);
519 if (ret)
520 rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret);
521
522out:
523 /* Beware - returning non-zero tells the rdma_cm to destroy
524 * the cm_id. We should certainly not do it as long as we still
525 * "own" the cm_id. */
526 if (ret) {
527 if (ic->i_cm_id == cm_id)
528 ret = 0;
529 }
530 return ret;
531}
532
533int rds_ib_conn_connect(struct rds_connection *conn)
534{
535 struct rds_ib_connection *ic = conn->c_transport_data;
536 struct sockaddr_in src, dest;
537 int ret;
538
539 /* XXX I wonder what affect the port space has */
540 /* delegate cm event handler to rdma_transport */
541 ic->i_cm_id = rdma_create_id(rds_rdma_cm_event_handler, conn,
542 RDMA_PS_TCP);
543 if (IS_ERR(ic->i_cm_id)) {
544 ret = PTR_ERR(ic->i_cm_id);
545 ic->i_cm_id = NULL;
546 rdsdebug("rdma_create_id() failed: %d\n", ret);
547 goto out;
548 }
549
550 rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
551
552 src.sin_family = AF_INET;
553 src.sin_addr.s_addr = (__force u32)conn->c_laddr;
554 src.sin_port = (__force u16)htons(0);
555
556 dest.sin_family = AF_INET;
557 dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
558 dest.sin_port = (__force u16)htons(RDS_PORT);
559
560 ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
561 (struct sockaddr *)&dest,
562 RDS_RDMA_RESOLVE_TIMEOUT_MS);
563 if (ret) {
564 rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
565 ret);
566 rdma_destroy_id(ic->i_cm_id);
567 ic->i_cm_id = NULL;
568 }
569
570out:
571 return ret;
572}
573
574/*
575 * This is so careful about only cleaning up resources that were built up
576 * so that it can be called at any point during startup. In fact it
577 * can be called multiple times for a given connection.
578 */
579void rds_ib_conn_shutdown(struct rds_connection *conn)
580{
581 struct rds_ib_connection *ic = conn->c_transport_data;
582 int err = 0;
583
584 rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
585 ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
586 ic->i_cm_id ? ic->i_cm_id->qp : NULL);
587
588 if (ic->i_cm_id) {
589 struct ib_device *dev = ic->i_cm_id->device;
590
591 rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
592 err = rdma_disconnect(ic->i_cm_id);
593 if (err) {
594 /* Actually this may happen quite frequently, when
595 * an outgoing connect raced with an incoming connect.
596 */
597 rdsdebug("failed to disconnect, cm: %p err %d\n",
598 ic->i_cm_id, err);
599 }
600
601 wait_event(rds_ib_ring_empty_wait,
602 rds_ib_ring_empty(&ic->i_send_ring) &&
603 rds_ib_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_ib_send_clear_ring(ic);
625 if (ic->i_recvs)
626 rds_ib_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 rdma_destroy_id(ic->i_cm_id);
635
636 /*
637 * Move connection back to the nodev list.
638 */
Andy Grover745cbcc2009-04-01 08:20:19 +0000639 if (ic->rds_ibdev)
640 rds_ib_remove_conn(ic->rds_ibdev, conn);
Andy Groverec162272009-02-24 15:30:30 +0000641
642 ic->i_cm_id = NULL;
643 ic->i_pd = NULL;
644 ic->i_mr = NULL;
645 ic->i_send_cq = NULL;
646 ic->i_recv_cq = NULL;
647 ic->i_send_hdrs = NULL;
648 ic->i_recv_hdrs = NULL;
649 ic->i_ack = NULL;
650 }
651 BUG_ON(ic->rds_ibdev);
652
653 /* Clear pending transmit */
654 if (ic->i_rm) {
655 rds_message_put(ic->i_rm);
656 ic->i_rm = NULL;
657 }
658
659 /* Clear the ACK state */
660 clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
Andy Grover8cbd9602009-04-01 08:20:20 +0000661#ifdef KERNEL_HAS_ATOMIC64
662 atomic64_set(&ic->i_ack_next, 0);
663#else
664 ic->i_ack_next = 0;
665#endif
Andy Groverec162272009-02-24 15:30:30 +0000666 ic->i_ack_recv = 0;
667
668 /* Clear flow control state */
669 ic->i_flowctl = 0;
670 atomic_set(&ic->i_credits, 0);
671
672 rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
673 rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
674
675 if (ic->i_ibinc) {
676 rds_inc_put(&ic->i_ibinc->ii_inc);
677 ic->i_ibinc = NULL;
678 }
679
680 vfree(ic->i_sends);
681 ic->i_sends = NULL;
682 vfree(ic->i_recvs);
683 ic->i_recvs = NULL;
684}
685
686int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp)
687{
688 struct rds_ib_connection *ic;
689 unsigned long flags;
690
691 /* XXX too lazy? */
692 ic = kzalloc(sizeof(struct rds_ib_connection), GFP_KERNEL);
693 if (ic == NULL)
694 return -ENOMEM;
695
696 INIT_LIST_HEAD(&ic->ib_node);
697 mutex_init(&ic->i_recv_mutex);
Andy Grover8cbd9602009-04-01 08:20:20 +0000698#ifndef KERNEL_HAS_ATOMIC64
699 spin_lock_init(&ic->i_ack_lock);
700#endif
Andy Groverec162272009-02-24 15:30:30 +0000701
702 /*
703 * rds_ib_conn_shutdown() waits for these to be emptied so they
704 * must be initialized before it can be called.
705 */
706 rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
707 rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
708
709 ic->conn = conn;
710 conn->c_transport_data = ic;
711
712 spin_lock_irqsave(&ib_nodev_conns_lock, flags);
713 list_add_tail(&ic->ib_node, &ib_nodev_conns);
714 spin_unlock_irqrestore(&ib_nodev_conns_lock, flags);
715
716
717 rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
718 return 0;
719}
720
Andy Grover745cbcc2009-04-01 08:20:19 +0000721/*
722 * Free a connection. Connection must be shut down and not set for reconnect.
723 */
Andy Groverec162272009-02-24 15:30:30 +0000724void rds_ib_conn_free(void *arg)
725{
726 struct rds_ib_connection *ic = arg;
Andy Grover745cbcc2009-04-01 08:20:19 +0000727 spinlock_t *lock_ptr;
728
Andy Groverec162272009-02-24 15:30:30 +0000729 rdsdebug("ic %p\n", ic);
Andy Grover745cbcc2009-04-01 08:20:19 +0000730
731 /*
732 * Conn is either on a dev's list or on the nodev list.
733 * A race with shutdown() or connect() would cause problems
734 * (since rds_ibdev would change) but that should never happen.
735 */
736 lock_ptr = ic->rds_ibdev ? &ic->rds_ibdev->spinlock : &ib_nodev_conns_lock;
737
738 spin_lock_irq(lock_ptr);
Andy Groverec162272009-02-24 15:30:30 +0000739 list_del(&ic->ib_node);
Andy Grover745cbcc2009-04-01 08:20:19 +0000740 spin_unlock_irq(lock_ptr);
741
Andy Groverec162272009-02-24 15:30:30 +0000742 kfree(ic);
743}
744
745
746/*
747 * An error occurred on the connection
748 */
749void
750__rds_ib_conn_error(struct rds_connection *conn, const char *fmt, ...)
751{
752 va_list ap;
753
754 rds_conn_drop(conn);
755
756 va_start(ap, fmt);
757 vprintk(fmt, ap);
758 va_end(ap);
759}