blob: f68832798db224d6abffcc08f4ad494fa2b3bc17 [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090035#include <linux/slab.h>
Andy Groverec162272009-02-24 15:30:30 +000036#include <linux/vmalloc.h>
37
38#include "rds.h"
39#include "ib.h"
40
41/*
42 * Set the selected protocol version
43 */
44static void rds_ib_set_protocol(struct rds_connection *conn, unsigned int version)
45{
46 conn->c_version = version;
47}
48
49/*
50 * Set up flow control
51 */
52static void rds_ib_set_flow_control(struct rds_connection *conn, u32 credits)
53{
54 struct rds_ib_connection *ic = conn->c_transport_data;
55
56 if (rds_ib_sysctl_flow_control && credits != 0) {
57 /* We're doing flow control */
58 ic->i_flowctl = 1;
59 rds_ib_send_add_credits(conn, credits);
60 } else {
61 ic->i_flowctl = 0;
62 }
63}
64
65/*
66 * Tune RNR behavior. Without flow control, we use a rather
67 * low timeout, but not the absolute minimum - this should
68 * be tunable.
69 *
70 * We already set the RNR retry count to 7 (which is the
71 * smallest infinite number :-) above.
72 * If flow control is off, we want to change this back to 0
73 * so that we learn quickly when our credit accounting is
74 * buggy.
75 *
76 * Caller passes in a qp_attr pointer - don't waste stack spacv
77 * by allocation this twice.
78 */
79static void
80rds_ib_tune_rnr(struct rds_ib_connection *ic, struct ib_qp_attr *attr)
81{
82 int ret;
83
84 attr->min_rnr_timer = IB_RNR_TIMER_000_32;
85 ret = ib_modify_qp(ic->i_cm_id->qp, attr, IB_QP_MIN_RNR_TIMER);
86 if (ret)
87 printk(KERN_NOTICE "ib_modify_qp(IB_QP_MIN_RNR_TIMER): err=%d\n", -ret);
88}
89
90/*
91 * Connection established.
92 * We get here for both outgoing and incoming connection.
93 */
94void rds_ib_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event)
95{
96 const struct rds_ib_connect_private *dp = NULL;
97 struct rds_ib_connection *ic = conn->c_transport_data;
98 struct rds_ib_device *rds_ibdev;
99 struct ib_qp_attr qp_attr;
100 int err;
101
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000102 if (event->param.conn.private_data_len >= sizeof(*dp)) {
Andy Groverec162272009-02-24 15:30:30 +0000103 dp = event->param.conn.private_data;
104
Andy Grover02a6a252009-07-17 13:13:24 +0000105 /* make sure it isn't empty data */
106 if (dp->dp_protocol_major) {
107 rds_ib_set_protocol(conn,
Andy Groverec162272009-02-24 15:30:30 +0000108 RDS_PROTOCOL(dp->dp_protocol_major,
Andy Grover02a6a252009-07-17 13:13:24 +0000109 dp->dp_protocol_minor));
110 rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
111 }
Andy Groverec162272009-02-24 15:30:30 +0000112 }
113
114 printk(KERN_NOTICE "RDS/IB: connected to %pI4 version %u.%u%s\n",
Andy Grover8dacd572009-07-17 13:13:25 +0000115 &conn->c_faddr,
Andy Groverec162272009-02-24 15:30:30 +0000116 RDS_PROTOCOL_MAJOR(conn->c_version),
117 RDS_PROTOCOL_MINOR(conn->c_version),
118 ic->i_flowctl ? ", flow control" : "");
119
Andy Grovere11d9122009-07-17 13:13:29 +0000120 /*
121 * Init rings and fill recv. this needs to wait until protocol negotiation
122 * is complete, since ring layout is different from 3.0 to 3.1.
123 */
124 rds_ib_send_init_ring(ic);
125 rds_ib_recv_init_ring(ic);
126 /* Post receive buffers - as a side effect, this will update
127 * the posted credit count. */
128 rds_ib_recv_refill(conn, GFP_KERNEL, GFP_HIGHUSER, 1);
129
Andy Groverec162272009-02-24 15:30:30 +0000130 /* Tune RNR behavior */
131 rds_ib_tune_rnr(ic, &qp_attr);
132
133 qp_attr.qp_state = IB_QPS_RTS;
134 err = ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE);
135 if (err)
136 printk(KERN_NOTICE "ib_modify_qp(IB_QP_STATE, RTS): err=%d\n", err);
137
138 /* update ib_device with this local ipaddr & conn */
139 rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_client);
140 err = rds_ib_update_ipaddr(rds_ibdev, conn->c_laddr);
141 if (err)
142 printk(KERN_ERR "rds_ib_update_ipaddr failed (%d)\n", err);
Andy Grover745cbcc2009-04-01 08:20:19 +0000143 rds_ib_add_conn(rds_ibdev, conn);
Andy Groverec162272009-02-24 15:30:30 +0000144
145 /* If the peer gave us the last packet it saw, process this as if
146 * we had received a regular ACK. */
147 if (dp && dp->dp_ack_seq)
148 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
149
150 rds_connect_complete(conn);
151}
152
153static void rds_ib_cm_fill_conn_param(struct rds_connection *conn,
154 struct rdma_conn_param *conn_param,
155 struct rds_ib_connect_private *dp,
156 u32 protocol_version)
157{
158 memset(conn_param, 0, sizeof(struct rdma_conn_param));
159 /* XXX tune these? */
160 conn_param->responder_resources = 1;
161 conn_param->initiator_depth = 1;
Andy Grover3ba23ad2009-07-17 13:13:22 +0000162 conn_param->retry_count = min_t(unsigned int, rds_ib_retry_count, 7);
Andy Groverec162272009-02-24 15:30:30 +0000163 conn_param->rnr_retry_count = 7;
164
165 if (dp) {
166 struct rds_ib_connection *ic = conn->c_transport_data;
167
168 memset(dp, 0, sizeof(*dp));
169 dp->dp_saddr = conn->c_laddr;
170 dp->dp_daddr = conn->c_faddr;
171 dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version);
172 dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version);
173 dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS);
174 dp->dp_ack_seq = rds_ib_piggyb_ack(ic);
175
176 /* Advertise flow control */
177 if (ic->i_flowctl) {
178 unsigned int credits;
179
180 credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits));
181 dp->dp_credit = cpu_to_be32(credits);
182 atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits);
183 }
184
185 conn_param->private_data = dp;
186 conn_param->private_data_len = sizeof(*dp);
187 }
188}
189
190static void rds_ib_cq_event_handler(struct ib_event *event, void *data)
191{
192 rdsdebug("event %u data %p\n", event->event, data);
193}
194
195static void rds_ib_qp_event_handler(struct ib_event *event, void *data)
196{
197 struct rds_connection *conn = data;
198 struct rds_ib_connection *ic = conn->c_transport_data;
199
200 rdsdebug("conn %p ic %p event %u\n", conn, ic, event->event);
201
202 switch (event->event) {
203 case IB_EVENT_COMM_EST:
204 rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
205 break;
206 default:
Andy Grover97069782010-03-11 13:50:02 +0000207 rdsdebug("Fatal QP Event %u "
Andy Groverfdf6e6b2009-07-17 13:13:31 +0000208 "- connection %pI4->%pI4, reconnecting\n",
209 event->event, &conn->c_laddr, &conn->c_faddr);
Andy Grover97069782010-03-11 13:50:02 +0000210 rds_conn_drop(conn);
Andy Groverec162272009-02-24 15:30:30 +0000211 break;
212 }
213}
214
215/*
216 * This needs to be very careful to not leave IS_ERR pointers around for
217 * cleanup to trip over.
218 */
219static int rds_ib_setup_qp(struct rds_connection *conn)
220{
221 struct rds_ib_connection *ic = conn->c_transport_data;
222 struct ib_device *dev = ic->i_cm_id->device;
223 struct ib_qp_init_attr attr;
224 struct rds_ib_device *rds_ibdev;
225 int ret;
226
227 /* rds_ib_add_one creates a rds_ib_device object per IB device,
228 * and allocates a protection domain, memory range and FMR pool
229 * for each. If that fails for any reason, it will not register
230 * the rds_ibdev at all.
231 */
232 rds_ibdev = ib_get_client_data(dev, &rds_ib_client);
233 if (rds_ibdev == NULL) {
234 if (printk_ratelimit())
235 printk(KERN_NOTICE "RDS/IB: No client_data for device %s\n",
236 dev->name);
237 return -EOPNOTSUPP;
238 }
239
240 if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1)
241 rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1);
242 if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1)
243 rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1);
244
245 /* Protection domain and memory range */
246 ic->i_pd = rds_ibdev->pd;
247 ic->i_mr = rds_ibdev->mr;
248
249 ic->i_send_cq = ib_create_cq(dev, rds_ib_send_cq_comp_handler,
250 rds_ib_cq_event_handler, conn,
251 ic->i_send_ring.w_nr + 1, 0);
252 if (IS_ERR(ic->i_send_cq)) {
253 ret = PTR_ERR(ic->i_send_cq);
254 ic->i_send_cq = NULL;
255 rdsdebug("ib_create_cq send failed: %d\n", ret);
256 goto out;
257 }
258
259 ic->i_recv_cq = ib_create_cq(dev, rds_ib_recv_cq_comp_handler,
260 rds_ib_cq_event_handler, conn,
261 ic->i_recv_ring.w_nr, 0);
262 if (IS_ERR(ic->i_recv_cq)) {
263 ret = PTR_ERR(ic->i_recv_cq);
264 ic->i_recv_cq = NULL;
265 rdsdebug("ib_create_cq recv failed: %d\n", ret);
266 goto out;
267 }
268
269 ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
270 if (ret) {
271 rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
272 goto out;
273 }
274
275 ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
276 if (ret) {
277 rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
278 goto out;
279 }
280
281 /* XXX negotiate max send/recv with remote? */
282 memset(&attr, 0, sizeof(attr));
283 attr.event_handler = rds_ib_qp_event_handler;
284 attr.qp_context = conn;
285 /* + 1 to allow for the single ack message */
286 attr.cap.max_send_wr = ic->i_send_ring.w_nr + 1;
287 attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1;
288 attr.cap.max_send_sge = rds_ibdev->max_sge;
289 attr.cap.max_recv_sge = RDS_IB_RECV_SGE;
290 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
291 attr.qp_type = IB_QPT_RC;
292 attr.send_cq = ic->i_send_cq;
293 attr.recv_cq = ic->i_recv_cq;
294
295 /*
296 * XXX this can fail if max_*_wr is too large? Are we supposed
297 * to back off until we get a value that the hardware can support?
298 */
299 ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
300 if (ret) {
301 rdsdebug("rdma_create_qp failed: %d\n", ret);
302 goto out;
303 }
304
305 ic->i_send_hdrs = ib_dma_alloc_coherent(dev,
306 ic->i_send_ring.w_nr *
307 sizeof(struct rds_header),
308 &ic->i_send_hdrs_dma, GFP_KERNEL);
309 if (ic->i_send_hdrs == NULL) {
310 ret = -ENOMEM;
311 rdsdebug("ib_dma_alloc_coherent send failed\n");
312 goto out;
313 }
314
315 ic->i_recv_hdrs = ib_dma_alloc_coherent(dev,
316 ic->i_recv_ring.w_nr *
317 sizeof(struct rds_header),
318 &ic->i_recv_hdrs_dma, GFP_KERNEL);
319 if (ic->i_recv_hdrs == NULL) {
320 ret = -ENOMEM;
321 rdsdebug("ib_dma_alloc_coherent recv failed\n");
322 goto out;
323 }
324
325 ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header),
326 &ic->i_ack_dma, GFP_KERNEL);
327 if (ic->i_ack == NULL) {
328 ret = -ENOMEM;
329 rdsdebug("ib_dma_alloc_coherent ack failed\n");
330 goto out;
331 }
332
333 ic->i_sends = vmalloc(ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work));
334 if (ic->i_sends == NULL) {
335 ret = -ENOMEM;
336 rdsdebug("send allocation failed\n");
337 goto out;
338 }
Andy Grovere11d9122009-07-17 13:13:29 +0000339 memset(ic->i_sends, 0, ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work));
Andy Groverec162272009-02-24 15:30:30 +0000340
341 ic->i_recvs = vmalloc(ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work));
342 if (ic->i_recvs == NULL) {
343 ret = -ENOMEM;
344 rdsdebug("recv allocation failed\n");
345 goto out;
346 }
Andy Grovere11d9122009-07-17 13:13:29 +0000347 memset(ic->i_recvs, 0, ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work));
Andy Groverec162272009-02-24 15:30:30 +0000348
Andy Groverec162272009-02-24 15:30:30 +0000349 rds_ib_recv_init_ack(ic);
350
Andy Groverec162272009-02-24 15:30:30 +0000351 rdsdebug("conn %p pd %p mr %p cq %p %p\n", conn, ic->i_pd, ic->i_mr,
352 ic->i_send_cq, ic->i_recv_cq);
353
354out:
355 return ret;
356}
357
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000358static u32 rds_ib_protocol_compatible(struct rdma_cm_event *event)
Andy Groverec162272009-02-24 15:30:30 +0000359{
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000360 const struct rds_ib_connect_private *dp = event->param.conn.private_data;
Andy Groverec162272009-02-24 15:30:30 +0000361 u16 common;
362 u32 version = 0;
363
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000364 /*
365 * rdma_cm private data is odd - when there is any private data in the
Andy Groverec162272009-02-24 15:30:30 +0000366 * request, we will be given a pretty large buffer without telling us the
367 * original size. The only way to tell the difference is by looking at
368 * the contents, which are initialized to zero.
369 * If the protocol version fields aren't set, this is a connection attempt
370 * from an older version. This could could be 3.0 or 2.0 - we can't tell.
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000371 * We really should have changed this for OFED 1.3 :-(
372 */
373
374 /* Be paranoid. RDS always has privdata */
375 if (!event->param.conn.private_data_len) {
376 printk(KERN_NOTICE "RDS incoming connection has no private data, "
377 "rejecting\n");
378 return 0;
379 }
380
381 /* Even if len is crap *now* I still want to check it. -ASG */
Joe Perchesf64f9e72009-11-29 16:55:45 -0800382 if (event->param.conn.private_data_len < sizeof (*dp) ||
383 dp->dp_protocol_major == 0)
Andy Groverec162272009-02-24 15:30:30 +0000384 return RDS_PROTOCOL_3_0;
385
386 common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IB_SUPPORTED_PROTOCOLS;
387 if (dp->dp_protocol_major == 3 && common) {
388 version = RDS_PROTOCOL_3_0;
389 while ((common >>= 1) != 0)
390 version++;
391 } else if (printk_ratelimit()) {
392 printk(KERN_NOTICE "RDS: Connection from %pI4 using "
393 "incompatible protocol version %u.%u\n",
394 &dp->dp_saddr,
395 dp->dp_protocol_major,
396 dp->dp_protocol_minor);
397 }
398 return version;
399}
400
401int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
402 struct rdma_cm_event *event)
403{
404 __be64 lguid = cm_id->route.path_rec->sgid.global.interface_id;
405 __be64 fguid = cm_id->route.path_rec->dgid.global.interface_id;
406 const struct rds_ib_connect_private *dp = event->param.conn.private_data;
407 struct rds_ib_connect_private dp_rep;
408 struct rds_connection *conn = NULL;
409 struct rds_ib_connection *ic = NULL;
410 struct rdma_conn_param conn_param;
411 u32 version;
412 int err, destroy = 1;
413
414 /* Check whether the remote protocol version matches ours. */
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000415 version = rds_ib_protocol_compatible(event);
Andy Groverec162272009-02-24 15:30:30 +0000416 if (!version)
417 goto out;
418
419 rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u lguid 0x%llx fguid "
420 "0x%llx\n", &dp->dp_saddr, &dp->dp_daddr,
421 RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version),
422 (unsigned long long)be64_to_cpu(lguid),
423 (unsigned long long)be64_to_cpu(fguid));
424
425 conn = rds_conn_create(dp->dp_daddr, dp->dp_saddr, &rds_ib_transport,
426 GFP_KERNEL);
427 if (IS_ERR(conn)) {
428 rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn));
429 conn = NULL;
430 goto out;
431 }
432
433 /*
434 * The connection request may occur while the
435 * previous connection exist, e.g. in case of failover.
436 * But as connections may be initiated simultaneously
437 * by both hosts, we have a random backoff mechanism -
438 * see the comment above rds_queue_reconnect()
439 */
440 mutex_lock(&conn->c_cm_lock);
441 if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
442 if (rds_conn_state(conn) == RDS_CONN_UP) {
443 rdsdebug("incoming connect while connecting\n");
444 rds_conn_drop(conn);
445 rds_ib_stats_inc(s_ib_listen_closed_stale);
446 } else
447 if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
448 /* Wait and see - our connect may still be succeeding */
449 rds_ib_stats_inc(s_ib_connect_raced);
450 }
451 mutex_unlock(&conn->c_cm_lock);
452 goto out;
453 }
454
455 ic = conn->c_transport_data;
456
457 rds_ib_set_protocol(conn, version);
458 rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
459
460 /* If the peer gave us the last packet it saw, process this as if
461 * we had received a regular ACK. */
462 if (dp->dp_ack_seq)
463 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
464
465 BUG_ON(cm_id->context);
466 BUG_ON(ic->i_cm_id);
467
468 ic->i_cm_id = cm_id;
469 cm_id->context = conn;
470
471 /* We got halfway through setting up the ib_connection, if we
472 * fail now, we have to take the long route out of this mess. */
473 destroy = 0;
474
475 err = rds_ib_setup_qp(conn);
476 if (err) {
477 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", err);
Julia Lawall5daf47b2010-05-26 05:54:21 +0000478 mutex_unlock(&conn->c_cm_lock);
Andy Groverec162272009-02-24 15:30:30 +0000479 goto out;
480 }
481
482 rds_ib_cm_fill_conn_param(conn, &conn_param, &dp_rep, version);
483
484 /* rdma_accept() calls rdma_reject() internally if it fails */
485 err = rdma_accept(cm_id, &conn_param);
486 mutex_unlock(&conn->c_cm_lock);
487 if (err) {
488 rds_ib_conn_error(conn, "rdma_accept failed (%d)\n", err);
489 goto out;
490 }
491
492 return 0;
493
494out:
495 rdma_reject(cm_id, NULL, 0);
496 return destroy;
497}
498
499
500int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id)
501{
502 struct rds_connection *conn = cm_id->context;
503 struct rds_ib_connection *ic = conn->c_transport_data;
504 struct rdma_conn_param conn_param;
505 struct rds_ib_connect_private dp;
506 int ret;
507
508 /* If the peer doesn't do protocol negotiation, we must
509 * default to RDSv3.0 */
510 rds_ib_set_protocol(conn, RDS_PROTOCOL_3_0);
511 ic->i_flowctl = rds_ib_sysctl_flow_control; /* advertise flow control */
512
513 ret = rds_ib_setup_qp(conn);
514 if (ret) {
515 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret);
516 goto out;
517 }
518
519 rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION);
520
521 ret = rdma_connect(cm_id, &conn_param);
522 if (ret)
523 rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret);
524
525out:
526 /* Beware - returning non-zero tells the rdma_cm to destroy
527 * the cm_id. We should certainly not do it as long as we still
528 * "own" the cm_id. */
529 if (ret) {
530 if (ic->i_cm_id == cm_id)
531 ret = 0;
532 }
533 return ret;
534}
535
536int rds_ib_conn_connect(struct rds_connection *conn)
537{
538 struct rds_ib_connection *ic = conn->c_transport_data;
539 struct sockaddr_in src, dest;
540 int ret;
541
542 /* XXX I wonder what affect the port space has */
543 /* delegate cm event handler to rdma_transport */
544 ic->i_cm_id = rdma_create_id(rds_rdma_cm_event_handler, conn,
545 RDMA_PS_TCP);
546 if (IS_ERR(ic->i_cm_id)) {
547 ret = PTR_ERR(ic->i_cm_id);
548 ic->i_cm_id = NULL;
549 rdsdebug("rdma_create_id() failed: %d\n", ret);
550 goto out;
551 }
552
553 rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
554
555 src.sin_family = AF_INET;
556 src.sin_addr.s_addr = (__force u32)conn->c_laddr;
557 src.sin_port = (__force u16)htons(0);
558
559 dest.sin_family = AF_INET;
560 dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
561 dest.sin_port = (__force u16)htons(RDS_PORT);
562
563 ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
564 (struct sockaddr *)&dest,
565 RDS_RDMA_RESOLVE_TIMEOUT_MS);
566 if (ret) {
567 rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
568 ret);
569 rdma_destroy_id(ic->i_cm_id);
570 ic->i_cm_id = NULL;
571 }
572
573out:
574 return ret;
575}
576
577/*
578 * This is so careful about only cleaning up resources that were built up
579 * so that it can be called at any point during startup. In fact it
580 * can be called multiple times for a given connection.
581 */
582void rds_ib_conn_shutdown(struct rds_connection *conn)
583{
584 struct rds_ib_connection *ic = conn->c_transport_data;
585 int err = 0;
586
587 rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
588 ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
589 ic->i_cm_id ? ic->i_cm_id->qp : NULL);
590
591 if (ic->i_cm_id) {
592 struct ib_device *dev = ic->i_cm_id->device;
593
594 rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
595 err = rdma_disconnect(ic->i_cm_id);
596 if (err) {
597 /* Actually this may happen quite frequently, when
598 * an outgoing connect raced with an incoming connect.
599 */
600 rdsdebug("failed to disconnect, cm: %p err %d\n",
601 ic->i_cm_id, err);
602 }
603
604 wait_event(rds_ib_ring_empty_wait,
605 rds_ib_ring_empty(&ic->i_send_ring) &&
606 rds_ib_ring_empty(&ic->i_recv_ring));
607
608 if (ic->i_send_hdrs)
609 ib_dma_free_coherent(dev,
610 ic->i_send_ring.w_nr *
611 sizeof(struct rds_header),
612 ic->i_send_hdrs,
613 ic->i_send_hdrs_dma);
614
615 if (ic->i_recv_hdrs)
616 ib_dma_free_coherent(dev,
617 ic->i_recv_ring.w_nr *
618 sizeof(struct rds_header),
619 ic->i_recv_hdrs,
620 ic->i_recv_hdrs_dma);
621
622 if (ic->i_ack)
623 ib_dma_free_coherent(dev, sizeof(struct rds_header),
624 ic->i_ack, ic->i_ack_dma);
625
626 if (ic->i_sends)
627 rds_ib_send_clear_ring(ic);
628 if (ic->i_recvs)
629 rds_ib_recv_clear_ring(ic);
630
631 if (ic->i_cm_id->qp)
632 rdma_destroy_qp(ic->i_cm_id);
633 if (ic->i_send_cq)
634 ib_destroy_cq(ic->i_send_cq);
635 if (ic->i_recv_cq)
636 ib_destroy_cq(ic->i_recv_cq);
637 rdma_destroy_id(ic->i_cm_id);
638
639 /*
640 * Move connection back to the nodev list.
641 */
Andy Grover745cbcc2009-04-01 08:20:19 +0000642 if (ic->rds_ibdev)
643 rds_ib_remove_conn(ic->rds_ibdev, conn);
Andy Groverec162272009-02-24 15:30:30 +0000644
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_ibdev);
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);
Andy Grover8cbd9602009-04-01 08:20:20 +0000664#ifdef KERNEL_HAS_ATOMIC64
665 atomic64_set(&ic->i_ack_next, 0);
666#else
667 ic->i_ack_next = 0;
668#endif
Andy Groverec162272009-02-24 15:30:30 +0000669 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_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
676 rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
677
678 if (ic->i_ibinc) {
679 rds_inc_put(&ic->i_ibinc->ii_inc);
680 ic->i_ibinc = NULL;
681 }
682
683 vfree(ic->i_sends);
684 ic->i_sends = NULL;
685 vfree(ic->i_recvs);
686 ic->i_recvs = NULL;
687}
688
689int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp)
690{
691 struct rds_ib_connection *ic;
692 unsigned long flags;
693
694 /* XXX too lazy? */
695 ic = kzalloc(sizeof(struct rds_ib_connection), GFP_KERNEL);
696 if (ic == NULL)
697 return -ENOMEM;
698
699 INIT_LIST_HEAD(&ic->ib_node);
Andy Groverd521b632009-10-30 08:51:57 +0000700 tasklet_init(&ic->i_recv_tasklet, rds_ib_recv_tasklet_fn,
701 (unsigned long) ic);
Andy Groverec162272009-02-24 15:30:30 +0000702 mutex_init(&ic->i_recv_mutex);
Andy Grover8cbd9602009-04-01 08:20:20 +0000703#ifndef KERNEL_HAS_ATOMIC64
704 spin_lock_init(&ic->i_ack_lock);
705#endif
Andy Groverec162272009-02-24 15:30:30 +0000706
707 /*
708 * rds_ib_conn_shutdown() waits for these to be emptied so they
709 * must be initialized before it can be called.
710 */
711 rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
712 rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
713
714 ic->conn = conn;
715 conn->c_transport_data = ic;
716
717 spin_lock_irqsave(&ib_nodev_conns_lock, flags);
718 list_add_tail(&ic->ib_node, &ib_nodev_conns);
719 spin_unlock_irqrestore(&ib_nodev_conns_lock, flags);
720
721
722 rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
723 return 0;
724}
725
Andy Grover745cbcc2009-04-01 08:20:19 +0000726/*
727 * Free a connection. Connection must be shut down and not set for reconnect.
728 */
Andy Groverec162272009-02-24 15:30:30 +0000729void rds_ib_conn_free(void *arg)
730{
731 struct rds_ib_connection *ic = arg;
Andy Grover745cbcc2009-04-01 08:20:19 +0000732 spinlock_t *lock_ptr;
733
Andy Groverec162272009-02-24 15:30:30 +0000734 rdsdebug("ic %p\n", ic);
Andy Grover745cbcc2009-04-01 08:20:19 +0000735
736 /*
737 * Conn is either on a dev's list or on the nodev list.
738 * A race with shutdown() or connect() would cause problems
739 * (since rds_ibdev would change) but that should never happen.
740 */
741 lock_ptr = ic->rds_ibdev ? &ic->rds_ibdev->spinlock : &ib_nodev_conns_lock;
742
743 spin_lock_irq(lock_ptr);
Andy Groverec162272009-02-24 15:30:30 +0000744 list_del(&ic->ib_node);
Andy Grover745cbcc2009-04-01 08:20:19 +0000745 spin_unlock_irq(lock_ptr);
746
Andy Groverec162272009-02-24 15:30:30 +0000747 kfree(ic);
748}
749
750
751/*
752 * An error occurred on the connection
753 */
754void
755__rds_ib_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}