blob: 123c7d33b54e78b80b2dc3927b2bd66a2ce029ba [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;
Andy Groverec162272009-02-24 15:30:30 +000098 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
Andy Groverf147dd92010-01-13 15:50:09 -0800113 if (conn->c_version < RDS_PROTOCOL(3,1)) {
114 printk(KERN_NOTICE "RDS/IB: Connection to %pI4 version %u.%u failed,"
115 " no longer supported\n",
116 &conn->c_faddr,
117 RDS_PROTOCOL_MAJOR(conn->c_version),
118 RDS_PROTOCOL_MINOR(conn->c_version));
119 rds_conn_destroy(conn);
120 return;
121 } else {
122 printk(KERN_NOTICE "RDS/IB: connected to %pI4 version %u.%u%s\n",
123 &conn->c_faddr,
124 RDS_PROTOCOL_MAJOR(conn->c_version),
125 RDS_PROTOCOL_MINOR(conn->c_version),
126 ic->i_flowctl ? ", flow control" : "");
127 }
Andy Groverec162272009-02-24 15:30:30 +0000128
Andy Grovere11d9122009-07-17 13:13:29 +0000129 /*
130 * Init rings and fill recv. this needs to wait until protocol negotiation
131 * is complete, since ring layout is different from 3.0 to 3.1.
132 */
133 rds_ib_send_init_ring(ic);
134 rds_ib_recv_init_ring(ic);
135 /* Post receive buffers - as a side effect, this will update
136 * the posted credit count. */
Andy Groverf17a1a52010-03-18 17:19:52 -0700137 rds_ib_recv_refill(conn, 1);
Andy Grovere11d9122009-07-17 13:13:29 +0000138
Andy Groverec162272009-02-24 15:30:30 +0000139 /* Tune RNR behavior */
140 rds_ib_tune_rnr(ic, &qp_attr);
141
142 qp_attr.qp_state = IB_QPS_RTS;
143 err = ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE);
144 if (err)
145 printk(KERN_NOTICE "ib_modify_qp(IB_QP_STATE, RTS): err=%d\n", err);
146
Zach Brown3e0249f2010-05-18 15:48:51 -0700147 /* update ib_device with this local ipaddr */
148 err = rds_ib_update_ipaddr(ic->rds_ibdev, conn->c_laddr);
Andy Groverec162272009-02-24 15:30:30 +0000149 if (err)
Zach Brown3e0249f2010-05-18 15:48:51 -0700150 printk(KERN_ERR "rds_ib_update_ipaddr failed (%d)\n",
151 err);
Andy Groverec162272009-02-24 15:30:30 +0000152
153 /* If the peer gave us the last packet it saw, process this as if
154 * we had received a regular ACK. */
155 if (dp && dp->dp_ack_seq)
156 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
157
158 rds_connect_complete(conn);
159}
160
161static void rds_ib_cm_fill_conn_param(struct rds_connection *conn,
162 struct rdma_conn_param *conn_param,
163 struct rds_ib_connect_private *dp,
Andy Grover40589e72010-01-12 10:50:48 -0800164 u32 protocol_version,
165 u32 max_responder_resources,
166 u32 max_initiator_depth)
Andy Groverec162272009-02-24 15:30:30 +0000167{
Andy Grover40589e72010-01-12 10:50:48 -0800168 struct rds_ib_connection *ic = conn->c_transport_data;
Zach Brown3e0249f2010-05-18 15:48:51 -0700169 struct rds_ib_device *rds_ibdev = ic->rds_ibdev;
Andy Grover40589e72010-01-12 10:50:48 -0800170
Andy Groverec162272009-02-24 15:30:30 +0000171 memset(conn_param, 0, sizeof(struct rdma_conn_param));
Andy Grover40589e72010-01-12 10:50:48 -0800172
Andy Grover40589e72010-01-12 10:50:48 -0800173 conn_param->responder_resources =
174 min_t(u32, rds_ibdev->max_responder_resources, max_responder_resources);
175 conn_param->initiator_depth =
176 min_t(u32, rds_ibdev->max_initiator_depth, max_initiator_depth);
Andy Grover3ba23ad2009-07-17 13:13:22 +0000177 conn_param->retry_count = min_t(unsigned int, rds_ib_retry_count, 7);
Andy Groverec162272009-02-24 15:30:30 +0000178 conn_param->rnr_retry_count = 7;
179
180 if (dp) {
Andy Groverec162272009-02-24 15:30:30 +0000181 memset(dp, 0, sizeof(*dp));
182 dp->dp_saddr = conn->c_laddr;
183 dp->dp_daddr = conn->c_faddr;
184 dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version);
185 dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version);
186 dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS);
187 dp->dp_ack_seq = rds_ib_piggyb_ack(ic);
188
189 /* Advertise flow control */
190 if (ic->i_flowctl) {
191 unsigned int credits;
192
193 credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits));
194 dp->dp_credit = cpu_to_be32(credits);
195 atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits);
196 }
197
198 conn_param->private_data = dp;
199 conn_param->private_data_len = sizeof(*dp);
200 }
201}
202
203static void rds_ib_cq_event_handler(struct ib_event *event, void *data)
204{
205 rdsdebug("event %u data %p\n", event->event, data);
206}
207
208static void rds_ib_qp_event_handler(struct ib_event *event, void *data)
209{
210 struct rds_connection *conn = data;
211 struct rds_ib_connection *ic = conn->c_transport_data;
212
213 rdsdebug("conn %p ic %p event %u\n", conn, ic, event->event);
214
215 switch (event->event) {
216 case IB_EVENT_COMM_EST:
217 rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
218 break;
219 default:
Andy Grover97069782010-03-11 13:50:02 +0000220 rdsdebug("Fatal QP Event %u "
Andy Groverfdf6e6b2009-07-17 13:13:31 +0000221 "- connection %pI4->%pI4, reconnecting\n",
222 event->event, &conn->c_laddr, &conn->c_faddr);
Andy Grover97069782010-03-11 13:50:02 +0000223 rds_conn_drop(conn);
Andy Groverec162272009-02-24 15:30:30 +0000224 break;
225 }
226}
227
228/*
229 * This needs to be very careful to not leave IS_ERR pointers around for
230 * cleanup to trip over.
231 */
232static int rds_ib_setup_qp(struct rds_connection *conn)
233{
234 struct rds_ib_connection *ic = conn->c_transport_data;
235 struct ib_device *dev = ic->i_cm_id->device;
236 struct ib_qp_init_attr attr;
237 struct rds_ib_device *rds_ibdev;
238 int ret;
239
Zach Brown3e0249f2010-05-18 15:48:51 -0700240 /*
241 * It's normal to see a null device if an incoming connection races
242 * with device removal, so we don't print a warning.
Andy Groverec162272009-02-24 15:30:30 +0000243 */
Zach Brown3e0249f2010-05-18 15:48:51 -0700244 rds_ibdev = rds_ib_get_client_data(dev);
245 if (!rds_ibdev)
Andy Groverec162272009-02-24 15:30:30 +0000246 return -EOPNOTSUPP;
Zach Brown3e0249f2010-05-18 15:48:51 -0700247
248 /* add the conn now so that connection establishment has the dev */
249 rds_ib_add_conn(rds_ibdev, conn);
Andy Groverec162272009-02-24 15:30:30 +0000250
251 if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1)
252 rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1);
253 if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1)
254 rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1);
255
256 /* Protection domain and memory range */
257 ic->i_pd = rds_ibdev->pd;
258 ic->i_mr = rds_ibdev->mr;
259
260 ic->i_send_cq = ib_create_cq(dev, rds_ib_send_cq_comp_handler,
261 rds_ib_cq_event_handler, conn,
262 ic->i_send_ring.w_nr + 1, 0);
263 if (IS_ERR(ic->i_send_cq)) {
264 ret = PTR_ERR(ic->i_send_cq);
265 ic->i_send_cq = NULL;
266 rdsdebug("ib_create_cq send failed: %d\n", ret);
267 goto out;
268 }
269
270 ic->i_recv_cq = ib_create_cq(dev, rds_ib_recv_cq_comp_handler,
271 rds_ib_cq_event_handler, conn,
272 ic->i_recv_ring.w_nr, 0);
273 if (IS_ERR(ic->i_recv_cq)) {
274 ret = PTR_ERR(ic->i_recv_cq);
275 ic->i_recv_cq = NULL;
276 rdsdebug("ib_create_cq recv failed: %d\n", ret);
277 goto out;
278 }
279
280 ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
281 if (ret) {
282 rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
283 goto out;
284 }
285
286 ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
287 if (ret) {
288 rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
289 goto out;
290 }
291
292 /* XXX negotiate max send/recv with remote? */
293 memset(&attr, 0, sizeof(attr));
294 attr.event_handler = rds_ib_qp_event_handler;
295 attr.qp_context = conn;
296 /* + 1 to allow for the single ack message */
297 attr.cap.max_send_wr = ic->i_send_ring.w_nr + 1;
298 attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1;
299 attr.cap.max_send_sge = rds_ibdev->max_sge;
300 attr.cap.max_recv_sge = RDS_IB_RECV_SGE;
301 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
302 attr.qp_type = IB_QPT_RC;
303 attr.send_cq = ic->i_send_cq;
304 attr.recv_cq = ic->i_recv_cq;
305
306 /*
307 * XXX this can fail if max_*_wr is too large? Are we supposed
308 * to back off until we get a value that the hardware can support?
309 */
310 ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
311 if (ret) {
312 rdsdebug("rdma_create_qp failed: %d\n", ret);
313 goto out;
314 }
315
316 ic->i_send_hdrs = ib_dma_alloc_coherent(dev,
317 ic->i_send_ring.w_nr *
318 sizeof(struct rds_header),
319 &ic->i_send_hdrs_dma, GFP_KERNEL);
Andy Grover8690bfa2010-01-12 11:56:44 -0800320 if (!ic->i_send_hdrs) {
Andy Groverec162272009-02-24 15:30:30 +0000321 ret = -ENOMEM;
322 rdsdebug("ib_dma_alloc_coherent send failed\n");
323 goto out;
324 }
325
326 ic->i_recv_hdrs = ib_dma_alloc_coherent(dev,
327 ic->i_recv_ring.w_nr *
328 sizeof(struct rds_header),
329 &ic->i_recv_hdrs_dma, GFP_KERNEL);
Andy Grover8690bfa2010-01-12 11:56:44 -0800330 if (!ic->i_recv_hdrs) {
Andy Groverec162272009-02-24 15:30:30 +0000331 ret = -ENOMEM;
332 rdsdebug("ib_dma_alloc_coherent recv failed\n");
333 goto out;
334 }
335
336 ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header),
337 &ic->i_ack_dma, GFP_KERNEL);
Andy Grover8690bfa2010-01-12 11:56:44 -0800338 if (!ic->i_ack) {
Andy Groverec162272009-02-24 15:30:30 +0000339 ret = -ENOMEM;
340 rdsdebug("ib_dma_alloc_coherent ack failed\n");
341 goto out;
342 }
343
Andy Grovere4c52c92010-04-23 10:49:53 -0700344 ic->i_sends = vmalloc_node(ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work),
345 ibdev_to_node(dev));
Andy Grover8690bfa2010-01-12 11:56:44 -0800346 if (!ic->i_sends) {
Andy Groverec162272009-02-24 15:30:30 +0000347 ret = -ENOMEM;
348 rdsdebug("send allocation failed\n");
349 goto out;
350 }
Andy Grovere11d9122009-07-17 13:13:29 +0000351 memset(ic->i_sends, 0, ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work));
Andy Groverec162272009-02-24 15:30:30 +0000352
Andy Grovere4c52c92010-04-23 10:49:53 -0700353 ic->i_recvs = vmalloc_node(ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work),
354 ibdev_to_node(dev));
Andy Grover8690bfa2010-01-12 11:56:44 -0800355 if (!ic->i_recvs) {
Andy Groverec162272009-02-24 15:30:30 +0000356 ret = -ENOMEM;
357 rdsdebug("recv allocation failed\n");
358 goto out;
359 }
Andy Grovere11d9122009-07-17 13:13:29 +0000360 memset(ic->i_recvs, 0, ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work));
Andy Groverec162272009-02-24 15:30:30 +0000361
Andy Groverec162272009-02-24 15:30:30 +0000362 rds_ib_recv_init_ack(ic);
363
Andy Groverec162272009-02-24 15:30:30 +0000364 rdsdebug("conn %p pd %p mr %p cq %p %p\n", conn, ic->i_pd, ic->i_mr,
365 ic->i_send_cq, ic->i_recv_cq);
366
367out:
Zach Brown3e0249f2010-05-18 15:48:51 -0700368 rds_ib_dev_put(rds_ibdev);
Andy Groverec162272009-02-24 15:30:30 +0000369 return ret;
370}
371
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000372static u32 rds_ib_protocol_compatible(struct rdma_cm_event *event)
Andy Groverec162272009-02-24 15:30:30 +0000373{
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000374 const struct rds_ib_connect_private *dp = event->param.conn.private_data;
Andy Groverec162272009-02-24 15:30:30 +0000375 u16 common;
376 u32 version = 0;
377
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000378 /*
379 * rdma_cm private data is odd - when there is any private data in the
Andy Groverec162272009-02-24 15:30:30 +0000380 * request, we will be given a pretty large buffer without telling us the
381 * original size. The only way to tell the difference is by looking at
382 * the contents, which are initialized to zero.
383 * If the protocol version fields aren't set, this is a connection attempt
384 * from an older version. This could could be 3.0 or 2.0 - we can't tell.
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000385 * We really should have changed this for OFED 1.3 :-(
386 */
387
388 /* Be paranoid. RDS always has privdata */
389 if (!event->param.conn.private_data_len) {
390 printk(KERN_NOTICE "RDS incoming connection has no private data, "
391 "rejecting\n");
392 return 0;
393 }
394
395 /* Even if len is crap *now* I still want to check it. -ASG */
Joe Perchesf64f9e72009-11-29 16:55:45 -0800396 if (event->param.conn.private_data_len < sizeof (*dp) ||
397 dp->dp_protocol_major == 0)
Andy Groverec162272009-02-24 15:30:30 +0000398 return RDS_PROTOCOL_3_0;
399
400 common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IB_SUPPORTED_PROTOCOLS;
401 if (dp->dp_protocol_major == 3 && common) {
402 version = RDS_PROTOCOL_3_0;
403 while ((common >>= 1) != 0)
404 version++;
405 } else if (printk_ratelimit()) {
406 printk(KERN_NOTICE "RDS: Connection from %pI4 using "
407 "incompatible protocol version %u.%u\n",
408 &dp->dp_saddr,
409 dp->dp_protocol_major,
410 dp->dp_protocol_minor);
411 }
412 return version;
413}
414
415int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
416 struct rdma_cm_event *event)
417{
418 __be64 lguid = cm_id->route.path_rec->sgid.global.interface_id;
419 __be64 fguid = cm_id->route.path_rec->dgid.global.interface_id;
420 const struct rds_ib_connect_private *dp = event->param.conn.private_data;
421 struct rds_ib_connect_private dp_rep;
422 struct rds_connection *conn = NULL;
423 struct rds_ib_connection *ic = NULL;
424 struct rdma_conn_param conn_param;
425 u32 version;
Zach Browna46ca942010-05-24 13:14:59 -0700426 int err = 1, destroy = 1;
Andy Groverec162272009-02-24 15:30:30 +0000427
428 /* Check whether the remote protocol version matches ours. */
Andy Grover9ddbcfa2009-07-17 13:13:23 +0000429 version = rds_ib_protocol_compatible(event);
Andy Groverec162272009-02-24 15:30:30 +0000430 if (!version)
431 goto out;
432
433 rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u lguid 0x%llx fguid "
434 "0x%llx\n", &dp->dp_saddr, &dp->dp_daddr,
435 RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version),
436 (unsigned long long)be64_to_cpu(lguid),
437 (unsigned long long)be64_to_cpu(fguid));
438
439 conn = rds_conn_create(dp->dp_daddr, dp->dp_saddr, &rds_ib_transport,
440 GFP_KERNEL);
441 if (IS_ERR(conn)) {
442 rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn));
443 conn = NULL;
444 goto out;
445 }
446
447 /*
448 * The connection request may occur while the
449 * previous connection exist, e.g. in case of failover.
450 * But as connections may be initiated simultaneously
451 * by both hosts, we have a random backoff mechanism -
452 * see the comment above rds_queue_reconnect()
453 */
454 mutex_lock(&conn->c_cm_lock);
455 if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
456 if (rds_conn_state(conn) == RDS_CONN_UP) {
457 rdsdebug("incoming connect while connecting\n");
458 rds_conn_drop(conn);
459 rds_ib_stats_inc(s_ib_listen_closed_stale);
460 } else
461 if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
462 /* Wait and see - our connect may still be succeeding */
463 rds_ib_stats_inc(s_ib_connect_raced);
464 }
Andy Groverec162272009-02-24 15:30:30 +0000465 goto out;
466 }
467
468 ic = conn->c_transport_data;
469
470 rds_ib_set_protocol(conn, version);
471 rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
472
473 /* If the peer gave us the last packet it saw, process this as if
474 * we had received a regular ACK. */
475 if (dp->dp_ack_seq)
476 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
477
478 BUG_ON(cm_id->context);
479 BUG_ON(ic->i_cm_id);
480
481 ic->i_cm_id = cm_id;
482 cm_id->context = conn;
483
484 /* We got halfway through setting up the ib_connection, if we
485 * fail now, we have to take the long route out of this mess. */
486 destroy = 0;
487
488 err = rds_ib_setup_qp(conn);
489 if (err) {
490 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", err);
Julia Lawall5daf47b2010-05-26 05:54:21 +0000491 mutex_unlock(&conn->c_cm_lock);
Andy Groverec162272009-02-24 15:30:30 +0000492 goto out;
493 }
494
Andy Grover40589e72010-01-12 10:50:48 -0800495 rds_ib_cm_fill_conn_param(conn, &conn_param, &dp_rep, version,
496 event->param.conn.responder_resources,
497 event->param.conn.initiator_depth);
Andy Groverec162272009-02-24 15:30:30 +0000498
499 /* rdma_accept() calls rdma_reject() internally if it fails */
500 err = rdma_accept(cm_id, &conn_param);
Zach Browna46ca942010-05-24 13:14:59 -0700501 if (err)
Andy Groverec162272009-02-24 15:30:30 +0000502 rds_ib_conn_error(conn, "rdma_accept failed (%d)\n", err);
Andy Groverec162272009-02-24 15:30:30 +0000503
504out:
Zach Browna46ca942010-05-24 13:14:59 -0700505 if (conn)
506 mutex_unlock(&conn->c_cm_lock);
507 if (err)
508 rdma_reject(cm_id, NULL, 0);
Andy Groverec162272009-02-24 15:30:30 +0000509 return destroy;
510}
511
512
513int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id)
514{
515 struct rds_connection *conn = cm_id->context;
516 struct rds_ib_connection *ic = conn->c_transport_data;
517 struct rdma_conn_param conn_param;
518 struct rds_ib_connect_private dp;
519 int ret;
520
521 /* If the peer doesn't do protocol negotiation, we must
522 * default to RDSv3.0 */
523 rds_ib_set_protocol(conn, RDS_PROTOCOL_3_0);
524 ic->i_flowctl = rds_ib_sysctl_flow_control; /* advertise flow control */
525
526 ret = rds_ib_setup_qp(conn);
527 if (ret) {
528 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret);
529 goto out;
530 }
531
Andy Grover40589e72010-01-12 10:50:48 -0800532 rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION,
533 UINT_MAX, UINT_MAX);
Andy Groverec162272009-02-24 15:30:30 +0000534 ret = rdma_connect(cm_id, &conn_param);
535 if (ret)
536 rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret);
537
538out:
539 /* Beware - returning non-zero tells the rdma_cm to destroy
540 * the cm_id. We should certainly not do it as long as we still
541 * "own" the cm_id. */
542 if (ret) {
543 if (ic->i_cm_id == cm_id)
544 ret = 0;
545 }
546 return ret;
547}
548
549int rds_ib_conn_connect(struct rds_connection *conn)
550{
551 struct rds_ib_connection *ic = conn->c_transport_data;
552 struct sockaddr_in src, dest;
553 int ret;
554
555 /* XXX I wonder what affect the port space has */
556 /* delegate cm event handler to rdma_transport */
557 ic->i_cm_id = rdma_create_id(rds_rdma_cm_event_handler, conn,
558 RDMA_PS_TCP);
559 if (IS_ERR(ic->i_cm_id)) {
560 ret = PTR_ERR(ic->i_cm_id);
561 ic->i_cm_id = NULL;
562 rdsdebug("rdma_create_id() failed: %d\n", ret);
563 goto out;
564 }
565
566 rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
567
568 src.sin_family = AF_INET;
569 src.sin_addr.s_addr = (__force u32)conn->c_laddr;
570 src.sin_port = (__force u16)htons(0);
571
572 dest.sin_family = AF_INET;
573 dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
574 dest.sin_port = (__force u16)htons(RDS_PORT);
575
576 ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
577 (struct sockaddr *)&dest,
578 RDS_RDMA_RESOLVE_TIMEOUT_MS);
579 if (ret) {
580 rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
581 ret);
582 rdma_destroy_id(ic->i_cm_id);
583 ic->i_cm_id = NULL;
584 }
585
586out:
587 return ret;
588}
589
590/*
591 * This is so careful about only cleaning up resources that were built up
592 * so that it can be called at any point during startup. In fact it
593 * can be called multiple times for a given connection.
594 */
595void rds_ib_conn_shutdown(struct rds_connection *conn)
596{
597 struct rds_ib_connection *ic = conn->c_transport_data;
598 int err = 0;
599
600 rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
601 ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
602 ic->i_cm_id ? ic->i_cm_id->qp : NULL);
603
604 if (ic->i_cm_id) {
605 struct ib_device *dev = ic->i_cm_id->device;
606
607 rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
608 err = rdma_disconnect(ic->i_cm_id);
609 if (err) {
610 /* Actually this may happen quite frequently, when
611 * an outgoing connect raced with an incoming connect.
612 */
613 rdsdebug("failed to disconnect, cm: %p err %d\n",
614 ic->i_cm_id, err);
615 }
616
Andy Grovere32b4a72010-03-03 19:25:21 -0800617 /*
Zach Brownf0460112010-07-14 13:55:35 -0700618 * We want to wait for tx and rx completion to finish
619 * before we tear down the connection, but we have to be
620 * careful not to get stuck waiting on a send ring that
621 * only has unsignaled sends in it. We've shutdown new
622 * sends before getting here so by waiting for signaled
623 * sends to complete we're ensured that there will be no
624 * more tx processing.
Andy Grovere32b4a72010-03-03 19:25:21 -0800625 */
Andy Groverec162272009-02-24 15:30:30 +0000626 wait_event(rds_ib_ring_empty_wait,
Zach Brownf0460112010-07-14 13:55:35 -0700627 rds_ib_ring_empty(&ic->i_recv_ring) &&
628 (atomic_read(&ic->i_signaled_sends) == 0));
629 tasklet_kill(&ic->i_recv_tasklet);
Andy Groverec162272009-02-24 15:30:30 +0000630
631 if (ic->i_send_hdrs)
632 ib_dma_free_coherent(dev,
633 ic->i_send_ring.w_nr *
634 sizeof(struct rds_header),
635 ic->i_send_hdrs,
636 ic->i_send_hdrs_dma);
637
638 if (ic->i_recv_hdrs)
639 ib_dma_free_coherent(dev,
640 ic->i_recv_ring.w_nr *
641 sizeof(struct rds_header),
642 ic->i_recv_hdrs,
643 ic->i_recv_hdrs_dma);
644
645 if (ic->i_ack)
646 ib_dma_free_coherent(dev, sizeof(struct rds_header),
647 ic->i_ack, ic->i_ack_dma);
648
649 if (ic->i_sends)
650 rds_ib_send_clear_ring(ic);
651 if (ic->i_recvs)
652 rds_ib_recv_clear_ring(ic);
653
654 if (ic->i_cm_id->qp)
655 rdma_destroy_qp(ic->i_cm_id);
656 if (ic->i_send_cq)
657 ib_destroy_cq(ic->i_send_cq);
658 if (ic->i_recv_cq)
659 ib_destroy_cq(ic->i_recv_cq);
660 rdma_destroy_id(ic->i_cm_id);
661
662 /*
663 * Move connection back to the nodev list.
664 */
Andy Grover745cbcc2009-04-01 08:20:19 +0000665 if (ic->rds_ibdev)
666 rds_ib_remove_conn(ic->rds_ibdev, conn);
Andy Groverec162272009-02-24 15:30:30 +0000667
668 ic->i_cm_id = NULL;
669 ic->i_pd = NULL;
670 ic->i_mr = NULL;
671 ic->i_send_cq = NULL;
672 ic->i_recv_cq = NULL;
673 ic->i_send_hdrs = NULL;
674 ic->i_recv_hdrs = NULL;
675 ic->i_ack = NULL;
676 }
677 BUG_ON(ic->rds_ibdev);
678
679 /* Clear pending transmit */
Andy Groverff3d7d32010-03-01 14:03:09 -0800680 if (ic->i_data_op) {
681 struct rds_message *rm;
682
683 rm = container_of(ic->i_data_op, struct rds_message, data);
684 rds_message_put(rm);
685 ic->i_data_op = NULL;
Andy Groverec162272009-02-24 15:30:30 +0000686 }
687
688 /* Clear the ACK state */
689 clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
Andy Grover8cbd9602009-04-01 08:20:20 +0000690#ifdef KERNEL_HAS_ATOMIC64
691 atomic64_set(&ic->i_ack_next, 0);
692#else
693 ic->i_ack_next = 0;
694#endif
Andy Groverec162272009-02-24 15:30:30 +0000695 ic->i_ack_recv = 0;
696
697 /* Clear flow control state */
698 ic->i_flowctl = 0;
699 atomic_set(&ic->i_credits, 0);
700
701 rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
702 rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
703
704 if (ic->i_ibinc) {
705 rds_inc_put(&ic->i_ibinc->ii_inc);
706 ic->i_ibinc = NULL;
707 }
708
709 vfree(ic->i_sends);
710 ic->i_sends = NULL;
711 vfree(ic->i_recvs);
712 ic->i_recvs = NULL;
713}
714
715int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp)
716{
717 struct rds_ib_connection *ic;
718 unsigned long flags;
Chris Mason33244122010-05-26 22:05:37 -0700719 int ret;
Andy Groverec162272009-02-24 15:30:30 +0000720
721 /* XXX too lazy? */
722 ic = kzalloc(sizeof(struct rds_ib_connection), GFP_KERNEL);
Andy Grover8690bfa2010-01-12 11:56:44 -0800723 if (!ic)
Andy Groverec162272009-02-24 15:30:30 +0000724 return -ENOMEM;
725
Chris Mason33244122010-05-26 22:05:37 -0700726 ret = rds_ib_recv_alloc_caches(ic);
727 if (ret) {
728 kfree(ic);
729 return ret;
730 }
731
Andy Groverec162272009-02-24 15:30:30 +0000732 INIT_LIST_HEAD(&ic->ib_node);
Andy Groverd521b632009-10-30 08:51:57 +0000733 tasklet_init(&ic->i_recv_tasklet, rds_ib_recv_tasklet_fn,
734 (unsigned long) ic);
Andy Groverec162272009-02-24 15:30:30 +0000735 mutex_init(&ic->i_recv_mutex);
Andy Grover8cbd9602009-04-01 08:20:20 +0000736#ifndef KERNEL_HAS_ATOMIC64
737 spin_lock_init(&ic->i_ack_lock);
738#endif
Zach Brownf0460112010-07-14 13:55:35 -0700739 atomic_set(&ic->i_signaled_sends, 0);
Andy Groverec162272009-02-24 15:30:30 +0000740
741 /*
742 * rds_ib_conn_shutdown() waits for these to be emptied so they
743 * must be initialized before it can be called.
744 */
745 rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
746 rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
747
748 ic->conn = conn;
749 conn->c_transport_data = ic;
750
751 spin_lock_irqsave(&ib_nodev_conns_lock, flags);
752 list_add_tail(&ic->ib_node, &ib_nodev_conns);
753 spin_unlock_irqrestore(&ib_nodev_conns_lock, flags);
754
755
756 rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
757 return 0;
758}
759
Andy Grover745cbcc2009-04-01 08:20:19 +0000760/*
761 * Free a connection. Connection must be shut down and not set for reconnect.
762 */
Andy Groverec162272009-02-24 15:30:30 +0000763void rds_ib_conn_free(void *arg)
764{
765 struct rds_ib_connection *ic = arg;
Andy Grover745cbcc2009-04-01 08:20:19 +0000766 spinlock_t *lock_ptr;
767
Andy Groverec162272009-02-24 15:30:30 +0000768 rdsdebug("ic %p\n", ic);
Andy Grover745cbcc2009-04-01 08:20:19 +0000769
770 /*
771 * Conn is either on a dev's list or on the nodev list.
772 * A race with shutdown() or connect() would cause problems
773 * (since rds_ibdev would change) but that should never happen.
774 */
775 lock_ptr = ic->rds_ibdev ? &ic->rds_ibdev->spinlock : &ib_nodev_conns_lock;
776
777 spin_lock_irq(lock_ptr);
Andy Groverec162272009-02-24 15:30:30 +0000778 list_del(&ic->ib_node);
Andy Grover745cbcc2009-04-01 08:20:19 +0000779 spin_unlock_irq(lock_ptr);
780
Chris Mason33244122010-05-26 22:05:37 -0700781 rds_ib_recv_free_caches(ic);
782
Andy Groverec162272009-02-24 15:30:30 +0000783 kfree(ic);
784}
785
786
787/*
788 * An error occurred on the connection
789 */
790void
791__rds_ib_conn_error(struct rds_connection *conn, const char *fmt, ...)
792{
793 va_list ap;
794
795 rds_conn_drop(conn);
796
797 va_start(ap, fmt);
798 vprintk(fmt, ap);
799 va_end(ap);
800}