blob: b5b5ebbc0bb6758e50e15739fe38cbbbd9a6ac0a [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
Andy Groverf147dd92010-01-13 15:50:09 -0800114 if (conn->c_version < RDS_PROTOCOL(3,1)) {
115 printk(KERN_NOTICE "RDS/IB: Connection to %pI4 version %u.%u failed,"
116 " no longer supported\n",
117 &conn->c_faddr,
118 RDS_PROTOCOL_MAJOR(conn->c_version),
119 RDS_PROTOCOL_MINOR(conn->c_version));
120 rds_conn_destroy(conn);
121 return;
122 } else {
123 printk(KERN_NOTICE "RDS/IB: connected to %pI4 version %u.%u%s\n",
124 &conn->c_faddr,
125 RDS_PROTOCOL_MAJOR(conn->c_version),
126 RDS_PROTOCOL_MINOR(conn->c_version),
127 ic->i_flowctl ? ", flow control" : "");
128 }
Andy Groverec162272009-02-24 15:30:30 +0000129
Andy Grovere11d9122009-07-17 13:13:29 +0000130 /*
131 * Init rings and fill recv. this needs to wait until protocol negotiation
132 * is complete, since ring layout is different from 3.0 to 3.1.
133 */
134 rds_ib_send_init_ring(ic);
135 rds_ib_recv_init_ring(ic);
136 /* Post receive buffers - as a side effect, this will update
137 * the posted credit count. */
138 rds_ib_recv_refill(conn, GFP_KERNEL, GFP_HIGHUSER, 1);
139
Andy Groverec162272009-02-24 15:30:30 +0000140 /* Tune RNR behavior */
141 rds_ib_tune_rnr(ic, &qp_attr);
142
143 qp_attr.qp_state = IB_QPS_RTS;
144 err = ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE);
145 if (err)
146 printk(KERN_NOTICE "ib_modify_qp(IB_QP_STATE, RTS): err=%d\n", err);
147
148 /* update ib_device with this local ipaddr & conn */
149 rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_client);
150 err = rds_ib_update_ipaddr(rds_ibdev, conn->c_laddr);
151 if (err)
152 printk(KERN_ERR "rds_ib_update_ipaddr failed (%d)\n", err);
Andy Grover745cbcc2009-04-01 08:20:19 +0000153 rds_ib_add_conn(rds_ibdev, conn);
Andy Groverec162272009-02-24 15:30:30 +0000154
155 /* If the peer gave us the last packet it saw, process this as if
156 * we had received a regular ACK. */
157 if (dp && dp->dp_ack_seq)
158 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
159
160 rds_connect_complete(conn);
161}
162
163static void rds_ib_cm_fill_conn_param(struct rds_connection *conn,
164 struct rdma_conn_param *conn_param,
165 struct rds_ib_connect_private *dp,
Andy Grover40589e72010-01-12 10:50:48 -0800166 u32 protocol_version,
167 u32 max_responder_resources,
168 u32 max_initiator_depth)
Andy Groverec162272009-02-24 15:30:30 +0000169{
Andy Grover40589e72010-01-12 10:50:48 -0800170 struct rds_ib_connection *ic = conn->c_transport_data;
171 struct rds_ib_device *rds_ibdev;
172
Andy Groverec162272009-02-24 15:30:30 +0000173 memset(conn_param, 0, sizeof(struct rdma_conn_param));
Andy Grover40589e72010-01-12 10:50:48 -0800174
175 rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_client);
176
177 conn_param->responder_resources =
178 min_t(u32, rds_ibdev->max_responder_resources, max_responder_resources);
179 conn_param->initiator_depth =
180 min_t(u32, rds_ibdev->max_initiator_depth, max_initiator_depth);
Andy Grover3ba23ad2009-07-17 13:13:22 +0000181 conn_param->retry_count = min_t(unsigned int, rds_ib_retry_count, 7);
Andy Groverec162272009-02-24 15:30:30 +0000182 conn_param->rnr_retry_count = 7;
183
184 if (dp) {
Andy Groverec162272009-02-24 15:30:30 +0000185 memset(dp, 0, sizeof(*dp));
186 dp->dp_saddr = conn->c_laddr;
187 dp->dp_daddr = conn->c_faddr;
188 dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version);
189 dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version);
190 dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS);
191 dp->dp_ack_seq = rds_ib_piggyb_ack(ic);
192
193 /* Advertise flow control */
194 if (ic->i_flowctl) {
195 unsigned int credits;
196
197 credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits));
198 dp->dp_credit = cpu_to_be32(credits);
199 atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits);
200 }
201
202 conn_param->private_data = dp;
203 conn_param->private_data_len = sizeof(*dp);
204 }
205}
206
207static void rds_ib_cq_event_handler(struct ib_event *event, void *data)
208{
209 rdsdebug("event %u data %p\n", event->event, data);
210}
211
212static void rds_ib_qp_event_handler(struct ib_event *event, void *data)
213{
214 struct rds_connection *conn = data;
215 struct rds_ib_connection *ic = conn->c_transport_data;
216
217 rdsdebug("conn %p ic %p event %u\n", conn, ic, event->event);
218
219 switch (event->event) {
220 case IB_EVENT_COMM_EST:
221 rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
222 break;
223 default:
Andy Grover97069782010-03-11 13:50:02 +0000224 rdsdebug("Fatal QP Event %u "
Andy Groverfdf6e6b2009-07-17 13:13:31 +0000225 "- connection %pI4->%pI4, reconnecting\n",
226 event->event, &conn->c_laddr, &conn->c_faddr);
Andy Grover97069782010-03-11 13:50:02 +0000227 rds_conn_drop(conn);
Andy Groverec162272009-02-24 15:30:30 +0000228 break;
229 }
230}
231
232/*
233 * This needs to be very careful to not leave IS_ERR pointers around for
234 * cleanup to trip over.
235 */
236static int rds_ib_setup_qp(struct rds_connection *conn)
237{
238 struct rds_ib_connection *ic = conn->c_transport_data;
239 struct ib_device *dev = ic->i_cm_id->device;
240 struct ib_qp_init_attr attr;
241 struct rds_ib_device *rds_ibdev;
242 int ret;
243
244 /* rds_ib_add_one creates a rds_ib_device object per IB device,
245 * and allocates a protection domain, memory range and FMR pool
246 * for each. If that fails for any reason, it will not register
247 * the rds_ibdev at all.
248 */
249 rds_ibdev = ib_get_client_data(dev, &rds_ib_client);
Andy Grover8690bfa2010-01-12 11:56:44 -0800250 if (!rds_ibdev) {
Andy Groverec162272009-02-24 15:30:30 +0000251 if (printk_ratelimit())
252 printk(KERN_NOTICE "RDS/IB: No client_data for device %s\n",
253 dev->name);
254 return -EOPNOTSUPP;
255 }
256
257 if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1)
258 rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1);
259 if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1)
260 rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1);
261
262 /* Protection domain and memory range */
263 ic->i_pd = rds_ibdev->pd;
264 ic->i_mr = rds_ibdev->mr;
265
266 ic->i_send_cq = ib_create_cq(dev, rds_ib_send_cq_comp_handler,
267 rds_ib_cq_event_handler, conn,
268 ic->i_send_ring.w_nr + 1, 0);
269 if (IS_ERR(ic->i_send_cq)) {
270 ret = PTR_ERR(ic->i_send_cq);
271 ic->i_send_cq = NULL;
272 rdsdebug("ib_create_cq send failed: %d\n", ret);
273 goto out;
274 }
275
276 ic->i_recv_cq = ib_create_cq(dev, rds_ib_recv_cq_comp_handler,
277 rds_ib_cq_event_handler, conn,
278 ic->i_recv_ring.w_nr, 0);
279 if (IS_ERR(ic->i_recv_cq)) {
280 ret = PTR_ERR(ic->i_recv_cq);
281 ic->i_recv_cq = NULL;
282 rdsdebug("ib_create_cq recv failed: %d\n", ret);
283 goto out;
284 }
285
286 ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
287 if (ret) {
288 rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
289 goto out;
290 }
291
292 ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
293 if (ret) {
294 rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
295 goto out;
296 }
297
298 /* XXX negotiate max send/recv with remote? */
299 memset(&attr, 0, sizeof(attr));
300 attr.event_handler = rds_ib_qp_event_handler;
301 attr.qp_context = conn;
302 /* + 1 to allow for the single ack message */
303 attr.cap.max_send_wr = ic->i_send_ring.w_nr + 1;
304 attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1;
305 attr.cap.max_send_sge = rds_ibdev->max_sge;
306 attr.cap.max_recv_sge = RDS_IB_RECV_SGE;
307 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
308 attr.qp_type = IB_QPT_RC;
309 attr.send_cq = ic->i_send_cq;
310 attr.recv_cq = ic->i_recv_cq;
311
312 /*
313 * XXX this can fail if max_*_wr is too large? Are we supposed
314 * to back off until we get a value that the hardware can support?
315 */
316 ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
317 if (ret) {
318 rdsdebug("rdma_create_qp failed: %d\n", ret);
319 goto out;
320 }
321
322 ic->i_send_hdrs = ib_dma_alloc_coherent(dev,
323 ic->i_send_ring.w_nr *
324 sizeof(struct rds_header),
325 &ic->i_send_hdrs_dma, GFP_KERNEL);
Andy Grover8690bfa2010-01-12 11:56:44 -0800326 if (!ic->i_send_hdrs) {
Andy Groverec162272009-02-24 15:30:30 +0000327 ret = -ENOMEM;
328 rdsdebug("ib_dma_alloc_coherent send failed\n");
329 goto out;
330 }
331
332 ic->i_recv_hdrs = ib_dma_alloc_coherent(dev,
333 ic->i_recv_ring.w_nr *
334 sizeof(struct rds_header),
335 &ic->i_recv_hdrs_dma, GFP_KERNEL);
Andy Grover8690bfa2010-01-12 11:56:44 -0800336 if (!ic->i_recv_hdrs) {
Andy Groverec162272009-02-24 15:30:30 +0000337 ret = -ENOMEM;
338 rdsdebug("ib_dma_alloc_coherent recv failed\n");
339 goto out;
340 }
341
342 ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header),
343 &ic->i_ack_dma, GFP_KERNEL);
Andy Grover8690bfa2010-01-12 11:56:44 -0800344 if (!ic->i_ack) {
Andy Groverec162272009-02-24 15:30:30 +0000345 ret = -ENOMEM;
346 rdsdebug("ib_dma_alloc_coherent ack failed\n");
347 goto out;
348 }
349
350 ic->i_sends = vmalloc(ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work));
Andy Grover8690bfa2010-01-12 11:56:44 -0800351 if (!ic->i_sends) {
Andy Groverec162272009-02-24 15:30:30 +0000352 ret = -ENOMEM;
353 rdsdebug("send allocation failed\n");
354 goto out;
355 }
Andy Grovere11d9122009-07-17 13:13:29 +0000356 memset(ic->i_sends, 0, ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work));
Andy Groverec162272009-02-24 15:30:30 +0000357
358 ic->i_recvs = vmalloc(ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work));
Andy Grover8690bfa2010-01-12 11:56:44 -0800359 if (!ic->i_recvs) {
Andy Groverec162272009-02-24 15:30:30 +0000360 ret = -ENOMEM;
361 rdsdebug("recv allocation failed\n");
362 goto out;
363 }
Andy Grovere11d9122009-07-17 13:13:29 +0000364 memset(ic->i_recvs, 0, ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work));
Andy Groverec162272009-02-24 15:30:30 +0000365
Andy Groverec162272009-02-24 15:30:30 +0000366 rds_ib_recv_init_ack(ic);
367
Andy Groverec162272009-02-24 15:30:30 +0000368 rdsdebug("conn %p pd %p mr %p cq %p %p\n", conn, ic->i_pd, ic->i_mr,
369 ic->i_send_cq, ic->i_recv_cq);
370
371out:
372 return ret;
373}
374
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000375static u32 rds_ib_protocol_compatible(struct rdma_cm_event *event)
Andy Groverec162272009-02-24 15:30:30 +0000376{
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000377 const struct rds_ib_connect_private *dp = event->param.conn.private_data;
Andy Groverec162272009-02-24 15:30:30 +0000378 u16 common;
379 u32 version = 0;
380
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000381 /*
382 * rdma_cm private data is odd - when there is any private data in the
Andy Groverec162272009-02-24 15:30:30 +0000383 * request, we will be given a pretty large buffer without telling us the
384 * original size. The only way to tell the difference is by looking at
385 * the contents, which are initialized to zero.
386 * If the protocol version fields aren't set, this is a connection attempt
387 * from an older version. This could could be 3.0 or 2.0 - we can't tell.
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000388 * We really should have changed this for OFED 1.3 :-(
389 */
390
391 /* Be paranoid. RDS always has privdata */
392 if (!event->param.conn.private_data_len) {
393 printk(KERN_NOTICE "RDS incoming connection has no private data, "
394 "rejecting\n");
395 return 0;
396 }
397
398 /* Even if len is crap *now* I still want to check it. -ASG */
Joe Perchesf64f9e72009-11-29 16:55:45 -0800399 if (event->param.conn.private_data_len < sizeof (*dp) ||
400 dp->dp_protocol_major == 0)
Andy Groverec162272009-02-24 15:30:30 +0000401 return RDS_PROTOCOL_3_0;
402
403 common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IB_SUPPORTED_PROTOCOLS;
404 if (dp->dp_protocol_major == 3 && common) {
405 version = RDS_PROTOCOL_3_0;
406 while ((common >>= 1) != 0)
407 version++;
408 } else if (printk_ratelimit()) {
409 printk(KERN_NOTICE "RDS: Connection from %pI4 using "
410 "incompatible protocol version %u.%u\n",
411 &dp->dp_saddr,
412 dp->dp_protocol_major,
413 dp->dp_protocol_minor);
414 }
415 return version;
416}
417
418int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
419 struct rdma_cm_event *event)
420{
421 __be64 lguid = cm_id->route.path_rec->sgid.global.interface_id;
422 __be64 fguid = cm_id->route.path_rec->dgid.global.interface_id;
423 const struct rds_ib_connect_private *dp = event->param.conn.private_data;
424 struct rds_ib_connect_private dp_rep;
425 struct rds_connection *conn = NULL;
426 struct rds_ib_connection *ic = NULL;
427 struct rdma_conn_param conn_param;
428 u32 version;
429 int err, destroy = 1;
430
431 /* Check whether the remote protocol version matches ours. */
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000432 version = rds_ib_protocol_compatible(event);
Andy Groverec162272009-02-24 15:30:30 +0000433 if (!version)
434 goto out;
435
436 rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u lguid 0x%llx fguid "
437 "0x%llx\n", &dp->dp_saddr, &dp->dp_daddr,
438 RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version),
439 (unsigned long long)be64_to_cpu(lguid),
440 (unsigned long long)be64_to_cpu(fguid));
441
442 conn = rds_conn_create(dp->dp_daddr, dp->dp_saddr, &rds_ib_transport,
443 GFP_KERNEL);
444 if (IS_ERR(conn)) {
445 rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn));
446 conn = NULL;
447 goto out;
448 }
449
450 /*
451 * The connection request may occur while the
452 * previous connection exist, e.g. in case of failover.
453 * But as connections may be initiated simultaneously
454 * by both hosts, we have a random backoff mechanism -
455 * see the comment above rds_queue_reconnect()
456 */
457 mutex_lock(&conn->c_cm_lock);
458 if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
459 if (rds_conn_state(conn) == RDS_CONN_UP) {
460 rdsdebug("incoming connect while connecting\n");
461 rds_conn_drop(conn);
462 rds_ib_stats_inc(s_ib_listen_closed_stale);
463 } else
464 if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
465 /* Wait and see - our connect may still be succeeding */
466 rds_ib_stats_inc(s_ib_connect_raced);
467 }
468 mutex_unlock(&conn->c_cm_lock);
469 goto out;
470 }
471
472 ic = conn->c_transport_data;
473
474 rds_ib_set_protocol(conn, version);
475 rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
476
477 /* If the peer gave us the last packet it saw, process this as if
478 * we had received a regular ACK. */
479 if (dp->dp_ack_seq)
480 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
481
482 BUG_ON(cm_id->context);
483 BUG_ON(ic->i_cm_id);
484
485 ic->i_cm_id = cm_id;
486 cm_id->context = conn;
487
488 /* We got halfway through setting up the ib_connection, if we
489 * fail now, we have to take the long route out of this mess. */
490 destroy = 0;
491
492 err = rds_ib_setup_qp(conn);
493 if (err) {
494 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", err);
Julia Lawall5daf47b2010-05-26 05:54:21 +0000495 mutex_unlock(&conn->c_cm_lock);
Andy Groverec162272009-02-24 15:30:30 +0000496 goto out;
497 }
498
Andy Grover40589e72010-01-12 10:50:48 -0800499 rds_ib_cm_fill_conn_param(conn, &conn_param, &dp_rep, version,
500 event->param.conn.responder_resources,
501 event->param.conn.initiator_depth);
Andy Groverec162272009-02-24 15:30:30 +0000502
503 /* rdma_accept() calls rdma_reject() internally if it fails */
504 err = rdma_accept(cm_id, &conn_param);
505 mutex_unlock(&conn->c_cm_lock);
506 if (err) {
507 rds_ib_conn_error(conn, "rdma_accept failed (%d)\n", err);
508 goto out;
509 }
510
511 return 0;
512
513out:
514 rdma_reject(cm_id, NULL, 0);
515 return destroy;
516}
517
518
519int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id)
520{
521 struct rds_connection *conn = cm_id->context;
522 struct rds_ib_connection *ic = conn->c_transport_data;
523 struct rdma_conn_param conn_param;
524 struct rds_ib_connect_private dp;
525 int ret;
526
527 /* If the peer doesn't do protocol negotiation, we must
528 * default to RDSv3.0 */
529 rds_ib_set_protocol(conn, RDS_PROTOCOL_3_0);
530 ic->i_flowctl = rds_ib_sysctl_flow_control; /* advertise flow control */
531
532 ret = rds_ib_setup_qp(conn);
533 if (ret) {
534 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret);
535 goto out;
536 }
537
Andy Grover40589e72010-01-12 10:50:48 -0800538 rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION,
539 UINT_MAX, UINT_MAX);
Andy Groverec162272009-02-24 15:30:30 +0000540 ret = rdma_connect(cm_id, &conn_param);
541 if (ret)
542 rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret);
543
544out:
545 /* Beware - returning non-zero tells the rdma_cm to destroy
546 * the cm_id. We should certainly not do it as long as we still
547 * "own" the cm_id. */
548 if (ret) {
549 if (ic->i_cm_id == cm_id)
550 ret = 0;
551 }
552 return ret;
553}
554
555int rds_ib_conn_connect(struct rds_connection *conn)
556{
557 struct rds_ib_connection *ic = conn->c_transport_data;
558 struct sockaddr_in src, dest;
559 int ret;
560
561 /* XXX I wonder what affect the port space has */
562 /* delegate cm event handler to rdma_transport */
563 ic->i_cm_id = rdma_create_id(rds_rdma_cm_event_handler, conn,
564 RDMA_PS_TCP);
565 if (IS_ERR(ic->i_cm_id)) {
566 ret = PTR_ERR(ic->i_cm_id);
567 ic->i_cm_id = NULL;
568 rdsdebug("rdma_create_id() failed: %d\n", ret);
569 goto out;
570 }
571
572 rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
573
574 src.sin_family = AF_INET;
575 src.sin_addr.s_addr = (__force u32)conn->c_laddr;
576 src.sin_port = (__force u16)htons(0);
577
578 dest.sin_family = AF_INET;
579 dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
580 dest.sin_port = (__force u16)htons(RDS_PORT);
581
582 ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
583 (struct sockaddr *)&dest,
584 RDS_RDMA_RESOLVE_TIMEOUT_MS);
585 if (ret) {
586 rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
587 ret);
588 rdma_destroy_id(ic->i_cm_id);
589 ic->i_cm_id = NULL;
590 }
591
592out:
593 return ret;
594}
595
596/*
597 * This is so careful about only cleaning up resources that were built up
598 * so that it can be called at any point during startup. In fact it
599 * can be called multiple times for a given connection.
600 */
601void rds_ib_conn_shutdown(struct rds_connection *conn)
602{
603 struct rds_ib_connection *ic = conn->c_transport_data;
604 int err = 0;
605
606 rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
607 ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
608 ic->i_cm_id ? ic->i_cm_id->qp : NULL);
609
610 if (ic->i_cm_id) {
611 struct ib_device *dev = ic->i_cm_id->device;
612
613 rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
614 err = rdma_disconnect(ic->i_cm_id);
615 if (err) {
616 /* Actually this may happen quite frequently, when
617 * an outgoing connect raced with an incoming connect.
618 */
619 rdsdebug("failed to disconnect, cm: %p err %d\n",
620 ic->i_cm_id, err);
621 }
622
623 wait_event(rds_ib_ring_empty_wait,
624 rds_ib_ring_empty(&ic->i_send_ring) &&
625 rds_ib_ring_empty(&ic->i_recv_ring));
626
627 if (ic->i_send_hdrs)
628 ib_dma_free_coherent(dev,
629 ic->i_send_ring.w_nr *
630 sizeof(struct rds_header),
631 ic->i_send_hdrs,
632 ic->i_send_hdrs_dma);
633
634 if (ic->i_recv_hdrs)
635 ib_dma_free_coherent(dev,
636 ic->i_recv_ring.w_nr *
637 sizeof(struct rds_header),
638 ic->i_recv_hdrs,
639 ic->i_recv_hdrs_dma);
640
641 if (ic->i_ack)
642 ib_dma_free_coherent(dev, sizeof(struct rds_header),
643 ic->i_ack, ic->i_ack_dma);
644
645 if (ic->i_sends)
646 rds_ib_send_clear_ring(ic);
647 if (ic->i_recvs)
648 rds_ib_recv_clear_ring(ic);
649
650 if (ic->i_cm_id->qp)
651 rdma_destroy_qp(ic->i_cm_id);
652 if (ic->i_send_cq)
653 ib_destroy_cq(ic->i_send_cq);
654 if (ic->i_recv_cq)
655 ib_destroy_cq(ic->i_recv_cq);
656 rdma_destroy_id(ic->i_cm_id);
657
658 /*
659 * Move connection back to the nodev list.
660 */
Andy Grover745cbcc2009-04-01 08:20:19 +0000661 if (ic->rds_ibdev)
662 rds_ib_remove_conn(ic->rds_ibdev, conn);
Andy Groverec162272009-02-24 15:30:30 +0000663
664 ic->i_cm_id = NULL;
665 ic->i_pd = NULL;
666 ic->i_mr = NULL;
667 ic->i_send_cq = NULL;
668 ic->i_recv_cq = NULL;
669 ic->i_send_hdrs = NULL;
670 ic->i_recv_hdrs = NULL;
671 ic->i_ack = NULL;
672 }
673 BUG_ON(ic->rds_ibdev);
674
675 /* Clear pending transmit */
Andy Groverff3d7d32010-03-01 14:03:09 -0800676 if (ic->i_data_op) {
677 struct rds_message *rm;
678
679 rm = container_of(ic->i_data_op, struct rds_message, data);
680 rds_message_put(rm);
681 ic->i_data_op = NULL;
Andy Groverec162272009-02-24 15:30:30 +0000682 }
683
684 /* Clear the ACK state */
685 clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
Andy Grover8cbd9602009-04-01 08:20:20 +0000686#ifdef KERNEL_HAS_ATOMIC64
687 atomic64_set(&ic->i_ack_next, 0);
688#else
689 ic->i_ack_next = 0;
690#endif
Andy Groverec162272009-02-24 15:30:30 +0000691 ic->i_ack_recv = 0;
692
693 /* Clear flow control state */
694 ic->i_flowctl = 0;
695 atomic_set(&ic->i_credits, 0);
696
697 rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
698 rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
699
700 if (ic->i_ibinc) {
701 rds_inc_put(&ic->i_ibinc->ii_inc);
702 ic->i_ibinc = NULL;
703 }
704
705 vfree(ic->i_sends);
706 ic->i_sends = NULL;
707 vfree(ic->i_recvs);
708 ic->i_recvs = NULL;
709}
710
711int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp)
712{
713 struct rds_ib_connection *ic;
714 unsigned long flags;
715
716 /* XXX too lazy? */
717 ic = kzalloc(sizeof(struct rds_ib_connection), GFP_KERNEL);
Andy Grover8690bfa2010-01-12 11:56:44 -0800718 if (!ic)
Andy Groverec162272009-02-24 15:30:30 +0000719 return -ENOMEM;
720
721 INIT_LIST_HEAD(&ic->ib_node);
Andy Groverd521b632009-10-30 08:51:57 +0000722 tasklet_init(&ic->i_recv_tasklet, rds_ib_recv_tasklet_fn,
723 (unsigned long) ic);
Andy Groverec162272009-02-24 15:30:30 +0000724 mutex_init(&ic->i_recv_mutex);
Andy Grover8cbd9602009-04-01 08:20:20 +0000725#ifndef KERNEL_HAS_ATOMIC64
726 spin_lock_init(&ic->i_ack_lock);
727#endif
Andy Groverec162272009-02-24 15:30:30 +0000728
729 /*
730 * rds_ib_conn_shutdown() waits for these to be emptied so they
731 * must be initialized before it can be called.
732 */
733 rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
734 rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
735
736 ic->conn = conn;
737 conn->c_transport_data = ic;
738
739 spin_lock_irqsave(&ib_nodev_conns_lock, flags);
740 list_add_tail(&ic->ib_node, &ib_nodev_conns);
741 spin_unlock_irqrestore(&ib_nodev_conns_lock, flags);
742
743
744 rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
745 return 0;
746}
747
Andy Grover745cbcc2009-04-01 08:20:19 +0000748/*
749 * Free a connection. Connection must be shut down and not set for reconnect.
750 */
Andy Groverec162272009-02-24 15:30:30 +0000751void rds_ib_conn_free(void *arg)
752{
753 struct rds_ib_connection *ic = arg;
Andy Grover745cbcc2009-04-01 08:20:19 +0000754 spinlock_t *lock_ptr;
755
Andy Groverec162272009-02-24 15:30:30 +0000756 rdsdebug("ic %p\n", ic);
Andy Grover745cbcc2009-04-01 08:20:19 +0000757
758 /*
759 * Conn is either on a dev's list or on the nodev list.
760 * A race with shutdown() or connect() would cause problems
761 * (since rds_ibdev would change) but that should never happen.
762 */
763 lock_ptr = ic->rds_ibdev ? &ic->rds_ibdev->spinlock : &ib_nodev_conns_lock;
764
765 spin_lock_irq(lock_ptr);
Andy Groverec162272009-02-24 15:30:30 +0000766 list_del(&ic->ib_node);
Andy Grover745cbcc2009-04-01 08:20:19 +0000767 spin_unlock_irq(lock_ptr);
768
Andy Groverec162272009-02-24 15:30:30 +0000769 kfree(ic);
770}
771
772
773/*
774 * An error occurred on the connection
775 */
776void
777__rds_ib_conn_error(struct rds_connection *conn, const char *fmt, ...)
778{
779 va_list ap;
780
781 rds_conn_drop(conn);
782
783 va_start(ap, fmt);
784 vprintk(fmt, ap);
785 va_end(ap);
786}