Loading...
1/*
2 * Copyright (c) 2006 Oracle. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33#include <linux/kernel.h>
34#include <linux/in.h>
35#include <linux/slab.h>
36#include <linux/vmalloc.h>
37#include <linux/ratelimit.h>
38
39#include "rds.h"
40#include "ib.h"
41
42static char *rds_ib_event_type_strings[] = {
43#define RDS_IB_EVENT_STRING(foo) \
44 [IB_EVENT_##foo] = __stringify(IB_EVENT_##foo)
45 RDS_IB_EVENT_STRING(CQ_ERR),
46 RDS_IB_EVENT_STRING(QP_FATAL),
47 RDS_IB_EVENT_STRING(QP_REQ_ERR),
48 RDS_IB_EVENT_STRING(QP_ACCESS_ERR),
49 RDS_IB_EVENT_STRING(COMM_EST),
50 RDS_IB_EVENT_STRING(SQ_DRAINED),
51 RDS_IB_EVENT_STRING(PATH_MIG),
52 RDS_IB_EVENT_STRING(PATH_MIG_ERR),
53 RDS_IB_EVENT_STRING(DEVICE_FATAL),
54 RDS_IB_EVENT_STRING(PORT_ACTIVE),
55 RDS_IB_EVENT_STRING(PORT_ERR),
56 RDS_IB_EVENT_STRING(LID_CHANGE),
57 RDS_IB_EVENT_STRING(PKEY_CHANGE),
58 RDS_IB_EVENT_STRING(SM_CHANGE),
59 RDS_IB_EVENT_STRING(SRQ_ERR),
60 RDS_IB_EVENT_STRING(SRQ_LIMIT_REACHED),
61 RDS_IB_EVENT_STRING(QP_LAST_WQE_REACHED),
62 RDS_IB_EVENT_STRING(CLIENT_REREGISTER),
63#undef RDS_IB_EVENT_STRING
64};
65
66static char *rds_ib_event_str(enum ib_event_type type)
67{
68 return rds_str_array(rds_ib_event_type_strings,
69 ARRAY_SIZE(rds_ib_event_type_strings), type);
70};
71
72/*
73 * Set the selected protocol version
74 */
75static void rds_ib_set_protocol(struct rds_connection *conn, unsigned int version)
76{
77 conn->c_version = version;
78}
79
80/*
81 * Set up flow control
82 */
83static void rds_ib_set_flow_control(struct rds_connection *conn, u32 credits)
84{
85 struct rds_ib_connection *ic = conn->c_transport_data;
86
87 if (rds_ib_sysctl_flow_control && credits != 0) {
88 /* We're doing flow control */
89 ic->i_flowctl = 1;
90 rds_ib_send_add_credits(conn, credits);
91 } else {
92 ic->i_flowctl = 0;
93 }
94}
95
96/*
97 * Tune RNR behavior. Without flow control, we use a rather
98 * low timeout, but not the absolute minimum - this should
99 * be tunable.
100 *
101 * We already set the RNR retry count to 7 (which is the
102 * smallest infinite number :-) above.
103 * If flow control is off, we want to change this back to 0
104 * so that we learn quickly when our credit accounting is
105 * buggy.
106 *
107 * Caller passes in a qp_attr pointer - don't waste stack spacv
108 * by allocation this twice.
109 */
110static void
111rds_ib_tune_rnr(struct rds_ib_connection *ic, struct ib_qp_attr *attr)
112{
113 int ret;
114
115 attr->min_rnr_timer = IB_RNR_TIMER_000_32;
116 ret = ib_modify_qp(ic->i_cm_id->qp, attr, IB_QP_MIN_RNR_TIMER);
117 if (ret)
118 printk(KERN_NOTICE "ib_modify_qp(IB_QP_MIN_RNR_TIMER): err=%d\n", -ret);
119}
120
121/*
122 * Connection established.
123 * We get here for both outgoing and incoming connection.
124 */
125void rds_ib_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event)
126{
127 const struct rds_ib_connect_private *dp = NULL;
128 struct rds_ib_connection *ic = conn->c_transport_data;
129 struct ib_qp_attr qp_attr;
130 int err;
131
132 if (event->param.conn.private_data_len >= sizeof(*dp)) {
133 dp = event->param.conn.private_data;
134
135 /* make sure it isn't empty data */
136 if (dp->dp_protocol_major) {
137 rds_ib_set_protocol(conn,
138 RDS_PROTOCOL(dp->dp_protocol_major,
139 dp->dp_protocol_minor));
140 rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
141 }
142 }
143
144 if (conn->c_version < RDS_PROTOCOL(3,1)) {
145 printk(KERN_NOTICE "RDS/IB: Connection to %pI4 version %u.%u failed,"
146 " no longer supported\n",
147 &conn->c_faddr,
148 RDS_PROTOCOL_MAJOR(conn->c_version),
149 RDS_PROTOCOL_MINOR(conn->c_version));
150 rds_conn_destroy(conn);
151 return;
152 } else {
153 printk(KERN_NOTICE "RDS/IB: connected to %pI4 version %u.%u%s\n",
154 &conn->c_faddr,
155 RDS_PROTOCOL_MAJOR(conn->c_version),
156 RDS_PROTOCOL_MINOR(conn->c_version),
157 ic->i_flowctl ? ", flow control" : "");
158 }
159
160 /*
161 * Init rings and fill recv. this needs to wait until protocol negotiation
162 * is complete, since ring layout is different from 3.0 to 3.1.
163 */
164 rds_ib_send_init_ring(ic);
165 rds_ib_recv_init_ring(ic);
166 /* Post receive buffers - as a side effect, this will update
167 * the posted credit count. */
168 rds_ib_recv_refill(conn, 1);
169
170 /* Tune RNR behavior */
171 rds_ib_tune_rnr(ic, &qp_attr);
172
173 qp_attr.qp_state = IB_QPS_RTS;
174 err = ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE);
175 if (err)
176 printk(KERN_NOTICE "ib_modify_qp(IB_QP_STATE, RTS): err=%d\n", err);
177
178 /* update ib_device with this local ipaddr */
179 err = rds_ib_update_ipaddr(ic->rds_ibdev, conn->c_laddr);
180 if (err)
181 printk(KERN_ERR "rds_ib_update_ipaddr failed (%d)\n",
182 err);
183
184 /* If the peer gave us the last packet it saw, process this as if
185 * we had received a regular ACK. */
186 if (dp && dp->dp_ack_seq)
187 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
188
189 rds_connect_complete(conn);
190}
191
192static void rds_ib_cm_fill_conn_param(struct rds_connection *conn,
193 struct rdma_conn_param *conn_param,
194 struct rds_ib_connect_private *dp,
195 u32 protocol_version,
196 u32 max_responder_resources,
197 u32 max_initiator_depth)
198{
199 struct rds_ib_connection *ic = conn->c_transport_data;
200 struct rds_ib_device *rds_ibdev = ic->rds_ibdev;
201
202 memset(conn_param, 0, sizeof(struct rdma_conn_param));
203
204 conn_param->responder_resources =
205 min_t(u32, rds_ibdev->max_responder_resources, max_responder_resources);
206 conn_param->initiator_depth =
207 min_t(u32, rds_ibdev->max_initiator_depth, max_initiator_depth);
208 conn_param->retry_count = min_t(unsigned int, rds_ib_retry_count, 7);
209 conn_param->rnr_retry_count = 7;
210
211 if (dp) {
212 memset(dp, 0, sizeof(*dp));
213 dp->dp_saddr = conn->c_laddr;
214 dp->dp_daddr = conn->c_faddr;
215 dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version);
216 dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version);
217 dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS);
218 dp->dp_ack_seq = rds_ib_piggyb_ack(ic);
219
220 /* Advertise flow control */
221 if (ic->i_flowctl) {
222 unsigned int credits;
223
224 credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits));
225 dp->dp_credit = cpu_to_be32(credits);
226 atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits);
227 }
228
229 conn_param->private_data = dp;
230 conn_param->private_data_len = sizeof(*dp);
231 }
232}
233
234static void rds_ib_cq_event_handler(struct ib_event *event, void *data)
235{
236 rdsdebug("event %u (%s) data %p\n",
237 event->event, rds_ib_event_str(event->event), data);
238}
239
240static void rds_ib_qp_event_handler(struct ib_event *event, void *data)
241{
242 struct rds_connection *conn = data;
243 struct rds_ib_connection *ic = conn->c_transport_data;
244
245 rdsdebug("conn %p ic %p event %u (%s)\n", conn, ic, event->event,
246 rds_ib_event_str(event->event));
247
248 switch (event->event) {
249 case IB_EVENT_COMM_EST:
250 rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
251 break;
252 default:
253 rdsdebug("Fatal QP Event %u (%s) "
254 "- connection %pI4->%pI4, reconnecting\n",
255 event->event, rds_ib_event_str(event->event),
256 &conn->c_laddr, &conn->c_faddr);
257 rds_conn_drop(conn);
258 break;
259 }
260}
261
262/*
263 * This needs to be very careful to not leave IS_ERR pointers around for
264 * cleanup to trip over.
265 */
266static int rds_ib_setup_qp(struct rds_connection *conn)
267{
268 struct rds_ib_connection *ic = conn->c_transport_data;
269 struct ib_device *dev = ic->i_cm_id->device;
270 struct ib_qp_init_attr attr;
271 struct rds_ib_device *rds_ibdev;
272 int ret;
273
274 /*
275 * It's normal to see a null device if an incoming connection races
276 * with device removal, so we don't print a warning.
277 */
278 rds_ibdev = rds_ib_get_client_data(dev);
279 if (!rds_ibdev)
280 return -EOPNOTSUPP;
281
282 /* add the conn now so that connection establishment has the dev */
283 rds_ib_add_conn(rds_ibdev, conn);
284
285 if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1)
286 rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1);
287 if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1)
288 rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1);
289
290 /* Protection domain and memory range */
291 ic->i_pd = rds_ibdev->pd;
292 ic->i_mr = rds_ibdev->mr;
293
294 ic->i_send_cq = ib_create_cq(dev, rds_ib_send_cq_comp_handler,
295 rds_ib_cq_event_handler, conn,
296 ic->i_send_ring.w_nr + 1, 0);
297 if (IS_ERR(ic->i_send_cq)) {
298 ret = PTR_ERR(ic->i_send_cq);
299 ic->i_send_cq = NULL;
300 rdsdebug("ib_create_cq send failed: %d\n", ret);
301 goto out;
302 }
303
304 ic->i_recv_cq = ib_create_cq(dev, rds_ib_recv_cq_comp_handler,
305 rds_ib_cq_event_handler, conn,
306 ic->i_recv_ring.w_nr, 0);
307 if (IS_ERR(ic->i_recv_cq)) {
308 ret = PTR_ERR(ic->i_recv_cq);
309 ic->i_recv_cq = NULL;
310 rdsdebug("ib_create_cq recv failed: %d\n", ret);
311 goto out;
312 }
313
314 ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
315 if (ret) {
316 rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
317 goto out;
318 }
319
320 ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
321 if (ret) {
322 rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
323 goto out;
324 }
325
326 /* XXX negotiate max send/recv with remote? */
327 memset(&attr, 0, sizeof(attr));
328 attr.event_handler = rds_ib_qp_event_handler;
329 attr.qp_context = conn;
330 /* + 1 to allow for the single ack message */
331 attr.cap.max_send_wr = ic->i_send_ring.w_nr + 1;
332 attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1;
333 attr.cap.max_send_sge = rds_ibdev->max_sge;
334 attr.cap.max_recv_sge = RDS_IB_RECV_SGE;
335 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
336 attr.qp_type = IB_QPT_RC;
337 attr.send_cq = ic->i_send_cq;
338 attr.recv_cq = ic->i_recv_cq;
339
340 /*
341 * XXX this can fail if max_*_wr is too large? Are we supposed
342 * to back off until we get a value that the hardware can support?
343 */
344 ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
345 if (ret) {
346 rdsdebug("rdma_create_qp failed: %d\n", ret);
347 goto out;
348 }
349
350 ic->i_send_hdrs = ib_dma_alloc_coherent(dev,
351 ic->i_send_ring.w_nr *
352 sizeof(struct rds_header),
353 &ic->i_send_hdrs_dma, GFP_KERNEL);
354 if (!ic->i_send_hdrs) {
355 ret = -ENOMEM;
356 rdsdebug("ib_dma_alloc_coherent send failed\n");
357 goto out;
358 }
359
360 ic->i_recv_hdrs = ib_dma_alloc_coherent(dev,
361 ic->i_recv_ring.w_nr *
362 sizeof(struct rds_header),
363 &ic->i_recv_hdrs_dma, GFP_KERNEL);
364 if (!ic->i_recv_hdrs) {
365 ret = -ENOMEM;
366 rdsdebug("ib_dma_alloc_coherent recv failed\n");
367 goto out;
368 }
369
370 ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header),
371 &ic->i_ack_dma, GFP_KERNEL);
372 if (!ic->i_ack) {
373 ret = -ENOMEM;
374 rdsdebug("ib_dma_alloc_coherent ack failed\n");
375 goto out;
376 }
377
378 ic->i_sends = vmalloc_node(ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work),
379 ibdev_to_node(dev));
380 if (!ic->i_sends) {
381 ret = -ENOMEM;
382 rdsdebug("send allocation failed\n");
383 goto out;
384 }
385 memset(ic->i_sends, 0, ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work));
386
387 ic->i_recvs = vmalloc_node(ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work),
388 ibdev_to_node(dev));
389 if (!ic->i_recvs) {
390 ret = -ENOMEM;
391 rdsdebug("recv allocation failed\n");
392 goto out;
393 }
394 memset(ic->i_recvs, 0, ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work));
395
396 rds_ib_recv_init_ack(ic);
397
398 rdsdebug("conn %p pd %p mr %p cq %p %p\n", conn, ic->i_pd, ic->i_mr,
399 ic->i_send_cq, ic->i_recv_cq);
400
401out:
402 rds_ib_dev_put(rds_ibdev);
403 return ret;
404}
405
406static u32 rds_ib_protocol_compatible(struct rdma_cm_event *event)
407{
408 const struct rds_ib_connect_private *dp = event->param.conn.private_data;
409 u16 common;
410 u32 version = 0;
411
412 /*
413 * rdma_cm private data is odd - when there is any private data in the
414 * request, we will be given a pretty large buffer without telling us the
415 * original size. The only way to tell the difference is by looking at
416 * the contents, which are initialized to zero.
417 * If the protocol version fields aren't set, this is a connection attempt
418 * from an older version. This could could be 3.0 or 2.0 - we can't tell.
419 * We really should have changed this for OFED 1.3 :-(
420 */
421
422 /* Be paranoid. RDS always has privdata */
423 if (!event->param.conn.private_data_len) {
424 printk(KERN_NOTICE "RDS incoming connection has no private data, "
425 "rejecting\n");
426 return 0;
427 }
428
429 /* Even if len is crap *now* I still want to check it. -ASG */
430 if (event->param.conn.private_data_len < sizeof (*dp) ||
431 dp->dp_protocol_major == 0)
432 return RDS_PROTOCOL_3_0;
433
434 common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IB_SUPPORTED_PROTOCOLS;
435 if (dp->dp_protocol_major == 3 && common) {
436 version = RDS_PROTOCOL_3_0;
437 while ((common >>= 1) != 0)
438 version++;
439 }
440 printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI4 using "
441 "incompatible protocol version %u.%u\n",
442 &dp->dp_saddr,
443 dp->dp_protocol_major,
444 dp->dp_protocol_minor);
445 return version;
446}
447
448int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
449 struct rdma_cm_event *event)
450{
451 __be64 lguid = cm_id->route.path_rec->sgid.global.interface_id;
452 __be64 fguid = cm_id->route.path_rec->dgid.global.interface_id;
453 const struct rds_ib_connect_private *dp = event->param.conn.private_data;
454 struct rds_ib_connect_private dp_rep;
455 struct rds_connection *conn = NULL;
456 struct rds_ib_connection *ic = NULL;
457 struct rdma_conn_param conn_param;
458 u32 version;
459 int err = 1, destroy = 1;
460
461 /* Check whether the remote protocol version matches ours. */
462 version = rds_ib_protocol_compatible(event);
463 if (!version)
464 goto out;
465
466 rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u lguid 0x%llx fguid "
467 "0x%llx\n", &dp->dp_saddr, &dp->dp_daddr,
468 RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version),
469 (unsigned long long)be64_to_cpu(lguid),
470 (unsigned long long)be64_to_cpu(fguid));
471
472 conn = rds_conn_create(dp->dp_daddr, dp->dp_saddr, &rds_ib_transport,
473 GFP_KERNEL);
474 if (IS_ERR(conn)) {
475 rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn));
476 conn = NULL;
477 goto out;
478 }
479
480 /*
481 * The connection request may occur while the
482 * previous connection exist, e.g. in case of failover.
483 * But as connections may be initiated simultaneously
484 * by both hosts, we have a random backoff mechanism -
485 * see the comment above rds_queue_reconnect()
486 */
487 mutex_lock(&conn->c_cm_lock);
488 if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
489 if (rds_conn_state(conn) == RDS_CONN_UP) {
490 rdsdebug("incoming connect while connecting\n");
491 rds_conn_drop(conn);
492 rds_ib_stats_inc(s_ib_listen_closed_stale);
493 } else
494 if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
495 /* Wait and see - our connect may still be succeeding */
496 rds_ib_stats_inc(s_ib_connect_raced);
497 }
498 goto out;
499 }
500
501 ic = conn->c_transport_data;
502
503 rds_ib_set_protocol(conn, version);
504 rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
505
506 /* If the peer gave us the last packet it saw, process this as if
507 * we had received a regular ACK. */
508 if (dp->dp_ack_seq)
509 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
510
511 BUG_ON(cm_id->context);
512 BUG_ON(ic->i_cm_id);
513
514 ic->i_cm_id = cm_id;
515 cm_id->context = conn;
516
517 /* We got halfway through setting up the ib_connection, if we
518 * fail now, we have to take the long route out of this mess. */
519 destroy = 0;
520
521 err = rds_ib_setup_qp(conn);
522 if (err) {
523 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", err);
524 goto out;
525 }
526
527 rds_ib_cm_fill_conn_param(conn, &conn_param, &dp_rep, version,
528 event->param.conn.responder_resources,
529 event->param.conn.initiator_depth);
530
531 /* rdma_accept() calls rdma_reject() internally if it fails */
532 err = rdma_accept(cm_id, &conn_param);
533 if (err)
534 rds_ib_conn_error(conn, "rdma_accept failed (%d)\n", err);
535
536out:
537 if (conn)
538 mutex_unlock(&conn->c_cm_lock);
539 if (err)
540 rdma_reject(cm_id, NULL, 0);
541 return destroy;
542}
543
544
545int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id)
546{
547 struct rds_connection *conn = cm_id->context;
548 struct rds_ib_connection *ic = conn->c_transport_data;
549 struct rdma_conn_param conn_param;
550 struct rds_ib_connect_private dp;
551 int ret;
552
553 /* If the peer doesn't do protocol negotiation, we must
554 * default to RDSv3.0 */
555 rds_ib_set_protocol(conn, RDS_PROTOCOL_3_0);
556 ic->i_flowctl = rds_ib_sysctl_flow_control; /* advertise flow control */
557
558 ret = rds_ib_setup_qp(conn);
559 if (ret) {
560 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret);
561 goto out;
562 }
563
564 rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION,
565 UINT_MAX, UINT_MAX);
566 ret = rdma_connect(cm_id, &conn_param);
567 if (ret)
568 rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret);
569
570out:
571 /* Beware - returning non-zero tells the rdma_cm to destroy
572 * the cm_id. We should certainly not do it as long as we still
573 * "own" the cm_id. */
574 if (ret) {
575 if (ic->i_cm_id == cm_id)
576 ret = 0;
577 }
578 return ret;
579}
580
581int rds_ib_conn_connect(struct rds_connection *conn)
582{
583 struct rds_ib_connection *ic = conn->c_transport_data;
584 struct sockaddr_in src, dest;
585 int ret;
586
587 /* XXX I wonder what affect the port space has */
588 /* delegate cm event handler to rdma_transport */
589 ic->i_cm_id = rdma_create_id(rds_rdma_cm_event_handler, conn,
590 RDMA_PS_TCP, IB_QPT_RC);
591 if (IS_ERR(ic->i_cm_id)) {
592 ret = PTR_ERR(ic->i_cm_id);
593 ic->i_cm_id = NULL;
594 rdsdebug("rdma_create_id() failed: %d\n", ret);
595 goto out;
596 }
597
598 rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
599
600 src.sin_family = AF_INET;
601 src.sin_addr.s_addr = (__force u32)conn->c_laddr;
602 src.sin_port = (__force u16)htons(0);
603
604 dest.sin_family = AF_INET;
605 dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
606 dest.sin_port = (__force u16)htons(RDS_PORT);
607
608 ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
609 (struct sockaddr *)&dest,
610 RDS_RDMA_RESOLVE_TIMEOUT_MS);
611 if (ret) {
612 rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
613 ret);
614 rdma_destroy_id(ic->i_cm_id);
615 ic->i_cm_id = NULL;
616 }
617
618out:
619 return ret;
620}
621
622/*
623 * This is so careful about only cleaning up resources that were built up
624 * so that it can be called at any point during startup. In fact it
625 * can be called multiple times for a given connection.
626 */
627void rds_ib_conn_shutdown(struct rds_connection *conn)
628{
629 struct rds_ib_connection *ic = conn->c_transport_data;
630 int err = 0;
631
632 rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
633 ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
634 ic->i_cm_id ? ic->i_cm_id->qp : NULL);
635
636 if (ic->i_cm_id) {
637 struct ib_device *dev = ic->i_cm_id->device;
638
639 rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
640 err = rdma_disconnect(ic->i_cm_id);
641 if (err) {
642 /* Actually this may happen quite frequently, when
643 * an outgoing connect raced with an incoming connect.
644 */
645 rdsdebug("failed to disconnect, cm: %p err %d\n",
646 ic->i_cm_id, err);
647 }
648
649 /*
650 * We want to wait for tx and rx completion to finish
651 * before we tear down the connection, but we have to be
652 * careful not to get stuck waiting on a send ring that
653 * only has unsignaled sends in it. We've shutdown new
654 * sends before getting here so by waiting for signaled
655 * sends to complete we're ensured that there will be no
656 * more tx processing.
657 */
658 wait_event(rds_ib_ring_empty_wait,
659 rds_ib_ring_empty(&ic->i_recv_ring) &&
660 (atomic_read(&ic->i_signaled_sends) == 0));
661 tasklet_kill(&ic->i_recv_tasklet);
662
663 if (ic->i_send_hdrs)
664 ib_dma_free_coherent(dev,
665 ic->i_send_ring.w_nr *
666 sizeof(struct rds_header),
667 ic->i_send_hdrs,
668 ic->i_send_hdrs_dma);
669
670 if (ic->i_recv_hdrs)
671 ib_dma_free_coherent(dev,
672 ic->i_recv_ring.w_nr *
673 sizeof(struct rds_header),
674 ic->i_recv_hdrs,
675 ic->i_recv_hdrs_dma);
676
677 if (ic->i_ack)
678 ib_dma_free_coherent(dev, sizeof(struct rds_header),
679 ic->i_ack, ic->i_ack_dma);
680
681 if (ic->i_sends)
682 rds_ib_send_clear_ring(ic);
683 if (ic->i_recvs)
684 rds_ib_recv_clear_ring(ic);
685
686 if (ic->i_cm_id->qp)
687 rdma_destroy_qp(ic->i_cm_id);
688 if (ic->i_send_cq)
689 ib_destroy_cq(ic->i_send_cq);
690 if (ic->i_recv_cq)
691 ib_destroy_cq(ic->i_recv_cq);
692 rdma_destroy_id(ic->i_cm_id);
693
694 /*
695 * Move connection back to the nodev list.
696 */
697 if (ic->rds_ibdev)
698 rds_ib_remove_conn(ic->rds_ibdev, conn);
699
700 ic->i_cm_id = NULL;
701 ic->i_pd = NULL;
702 ic->i_mr = NULL;
703 ic->i_send_cq = NULL;
704 ic->i_recv_cq = NULL;
705 ic->i_send_hdrs = NULL;
706 ic->i_recv_hdrs = NULL;
707 ic->i_ack = NULL;
708 }
709 BUG_ON(ic->rds_ibdev);
710
711 /* Clear pending transmit */
712 if (ic->i_data_op) {
713 struct rds_message *rm;
714
715 rm = container_of(ic->i_data_op, struct rds_message, data);
716 rds_message_put(rm);
717 ic->i_data_op = NULL;
718 }
719
720 /* Clear the ACK state */
721 clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
722#ifdef KERNEL_HAS_ATOMIC64
723 atomic64_set(&ic->i_ack_next, 0);
724#else
725 ic->i_ack_next = 0;
726#endif
727 ic->i_ack_recv = 0;
728
729 /* Clear flow control state */
730 ic->i_flowctl = 0;
731 atomic_set(&ic->i_credits, 0);
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 if (ic->i_ibinc) {
737 rds_inc_put(&ic->i_ibinc->ii_inc);
738 ic->i_ibinc = NULL;
739 }
740
741 vfree(ic->i_sends);
742 ic->i_sends = NULL;
743 vfree(ic->i_recvs);
744 ic->i_recvs = NULL;
745}
746
747int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp)
748{
749 struct rds_ib_connection *ic;
750 unsigned long flags;
751 int ret;
752
753 /* XXX too lazy? */
754 ic = kzalloc(sizeof(struct rds_ib_connection), GFP_KERNEL);
755 if (!ic)
756 return -ENOMEM;
757
758 ret = rds_ib_recv_alloc_caches(ic);
759 if (ret) {
760 kfree(ic);
761 return ret;
762 }
763
764 INIT_LIST_HEAD(&ic->ib_node);
765 tasklet_init(&ic->i_recv_tasklet, rds_ib_recv_tasklet_fn,
766 (unsigned long) ic);
767 mutex_init(&ic->i_recv_mutex);
768#ifndef KERNEL_HAS_ATOMIC64
769 spin_lock_init(&ic->i_ack_lock);
770#endif
771 atomic_set(&ic->i_signaled_sends, 0);
772
773 /*
774 * rds_ib_conn_shutdown() waits for these to be emptied so they
775 * must be initialized before it can be called.
776 */
777 rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
778 rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
779
780 ic->conn = conn;
781 conn->c_transport_data = ic;
782
783 spin_lock_irqsave(&ib_nodev_conns_lock, flags);
784 list_add_tail(&ic->ib_node, &ib_nodev_conns);
785 spin_unlock_irqrestore(&ib_nodev_conns_lock, flags);
786
787
788 rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
789 return 0;
790}
791
792/*
793 * Free a connection. Connection must be shut down and not set for reconnect.
794 */
795void rds_ib_conn_free(void *arg)
796{
797 struct rds_ib_connection *ic = arg;
798 spinlock_t *lock_ptr;
799
800 rdsdebug("ic %p\n", ic);
801
802 /*
803 * Conn is either on a dev's list or on the nodev list.
804 * A race with shutdown() or connect() would cause problems
805 * (since rds_ibdev would change) but that should never happen.
806 */
807 lock_ptr = ic->rds_ibdev ? &ic->rds_ibdev->spinlock : &ib_nodev_conns_lock;
808
809 spin_lock_irq(lock_ptr);
810 list_del(&ic->ib_node);
811 spin_unlock_irq(lock_ptr);
812
813 rds_ib_recv_free_caches(ic);
814
815 kfree(ic);
816}
817
818
819/*
820 * An error occurred on the connection
821 */
822void
823__rds_ib_conn_error(struct rds_connection *conn, const char *fmt, ...)
824{
825 va_list ap;
826
827 rds_conn_drop(conn);
828
829 va_start(ap, fmt);
830 vprintk(fmt, ap);
831 va_end(ap);
832}
1/*
2 * Copyright (c) 2006 Oracle. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33#include <linux/kernel.h>
34#include <linux/in.h>
35#include <linux/slab.h>
36#include <linux/vmalloc.h>
37#include <linux/ratelimit.h>
38
39#include "rds.h"
40#include "ib.h"
41
42/*
43 * Set the selected protocol version
44 */
45static void rds_ib_set_protocol(struct rds_connection *conn, unsigned int version)
46{
47 conn->c_version = version;
48}
49
50/*
51 * Set up flow control
52 */
53static void rds_ib_set_flow_control(struct rds_connection *conn, u32 credits)
54{
55 struct rds_ib_connection *ic = conn->c_transport_data;
56
57 if (rds_ib_sysctl_flow_control && credits != 0) {
58 /* We're doing flow control */
59 ic->i_flowctl = 1;
60 rds_ib_send_add_credits(conn, credits);
61 } else {
62 ic->i_flowctl = 0;
63 }
64}
65
66/*
67 * Tune RNR behavior. Without flow control, we use a rather
68 * low timeout, but not the absolute minimum - this should
69 * be tunable.
70 *
71 * We already set the RNR retry count to 7 (which is the
72 * smallest infinite number :-) above.
73 * If flow control is off, we want to change this back to 0
74 * so that we learn quickly when our credit accounting is
75 * buggy.
76 *
77 * Caller passes in a qp_attr pointer - don't waste stack spacv
78 * by allocation this twice.
79 */
80static void
81rds_ib_tune_rnr(struct rds_ib_connection *ic, struct ib_qp_attr *attr)
82{
83 int ret;
84
85 attr->min_rnr_timer = IB_RNR_TIMER_000_32;
86 ret = ib_modify_qp(ic->i_cm_id->qp, attr, IB_QP_MIN_RNR_TIMER);
87 if (ret)
88 printk(KERN_NOTICE "ib_modify_qp(IB_QP_MIN_RNR_TIMER): err=%d\n", -ret);
89}
90
91/*
92 * Connection established.
93 * We get here for both outgoing and incoming connection.
94 */
95void rds_ib_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event)
96{
97 const struct rds_ib_connect_private *dp = NULL;
98 struct rds_ib_connection *ic = conn->c_transport_data;
99 struct ib_qp_attr qp_attr;
100 int err;
101
102 if (event->param.conn.private_data_len >= sizeof(*dp)) {
103 dp = event->param.conn.private_data;
104
105 /* make sure it isn't empty data */
106 if (dp->dp_protocol_major) {
107 rds_ib_set_protocol(conn,
108 RDS_PROTOCOL(dp->dp_protocol_major,
109 dp->dp_protocol_minor));
110 rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
111 }
112 }
113
114 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 }
129
130 /*
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, 1, GFP_KERNEL);
139
140 /* 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 */
149 err = rds_ib_update_ipaddr(ic->rds_ibdev, conn->c_laddr);
150 if (err)
151 printk(KERN_ERR "rds_ib_update_ipaddr failed (%d)\n",
152 err);
153
154 /* If the peer gave us the last packet it saw, process this as if
155 * we had received a regular ACK. */
156 if (dp) {
157 /* dp structure start is not guaranteed to be 8 bytes aligned.
158 * Since dp_ack_seq is 64-bit extended load operations can be
159 * used so go through get_unaligned to avoid unaligned errors.
160 */
161 __be64 dp_ack_seq = get_unaligned(&dp->dp_ack_seq);
162
163 if (dp_ack_seq)
164 rds_send_drop_acked(conn, be64_to_cpu(dp_ack_seq),
165 NULL);
166 }
167
168 rds_connect_complete(conn);
169}
170
171static void rds_ib_cm_fill_conn_param(struct rds_connection *conn,
172 struct rdma_conn_param *conn_param,
173 struct rds_ib_connect_private *dp,
174 u32 protocol_version,
175 u32 max_responder_resources,
176 u32 max_initiator_depth)
177{
178 struct rds_ib_connection *ic = conn->c_transport_data;
179 struct rds_ib_device *rds_ibdev = ic->rds_ibdev;
180
181 memset(conn_param, 0, sizeof(struct rdma_conn_param));
182
183 conn_param->responder_resources =
184 min_t(u32, rds_ibdev->max_responder_resources, max_responder_resources);
185 conn_param->initiator_depth =
186 min_t(u32, rds_ibdev->max_initiator_depth, max_initiator_depth);
187 conn_param->retry_count = min_t(unsigned int, rds_ib_retry_count, 7);
188 conn_param->rnr_retry_count = 7;
189
190 if (dp) {
191 memset(dp, 0, sizeof(*dp));
192 dp->dp_saddr = conn->c_laddr;
193 dp->dp_daddr = conn->c_faddr;
194 dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version);
195 dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version);
196 dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS);
197 dp->dp_ack_seq = cpu_to_be64(rds_ib_piggyb_ack(ic));
198
199 /* Advertise flow control */
200 if (ic->i_flowctl) {
201 unsigned int credits;
202
203 credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits));
204 dp->dp_credit = cpu_to_be32(credits);
205 atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits);
206 }
207
208 conn_param->private_data = dp;
209 conn_param->private_data_len = sizeof(*dp);
210 }
211}
212
213static void rds_ib_cq_event_handler(struct ib_event *event, void *data)
214{
215 rdsdebug("event %u (%s) data %p\n",
216 event->event, ib_event_msg(event->event), data);
217}
218
219/* Plucking the oldest entry from the ring can be done concurrently with
220 * the thread refilling the ring. Each ring operation is protected by
221 * spinlocks and the transient state of refilling doesn't change the
222 * recording of which entry is oldest.
223 *
224 * This relies on IB only calling one cq comp_handler for each cq so that
225 * there will only be one caller of rds_recv_incoming() per RDS connection.
226 */
227static void rds_ib_cq_comp_handler_recv(struct ib_cq *cq, void *context)
228{
229 struct rds_connection *conn = context;
230 struct rds_ib_connection *ic = conn->c_transport_data;
231
232 rdsdebug("conn %p cq %p\n", conn, cq);
233
234 rds_ib_stats_inc(s_ib_evt_handler_call);
235
236 tasklet_schedule(&ic->i_recv_tasklet);
237}
238
239static void poll_scq(struct rds_ib_connection *ic, struct ib_cq *cq,
240 struct ib_wc *wcs)
241{
242 int nr, i;
243 struct ib_wc *wc;
244
245 while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) {
246 for (i = 0; i < nr; i++) {
247 wc = wcs + i;
248 rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n",
249 (unsigned long long)wc->wr_id, wc->status,
250 wc->byte_len, be32_to_cpu(wc->ex.imm_data));
251
252 if (wc->wr_id <= ic->i_send_ring.w_nr ||
253 wc->wr_id == RDS_IB_ACK_WR_ID)
254 rds_ib_send_cqe_handler(ic, wc);
255 else
256 rds_ib_mr_cqe_handler(ic, wc);
257
258 }
259 }
260}
261
262static void rds_ib_tasklet_fn_send(unsigned long data)
263{
264 struct rds_ib_connection *ic = (struct rds_ib_connection *)data;
265 struct rds_connection *conn = ic->conn;
266
267 rds_ib_stats_inc(s_ib_tasklet_call);
268
269 poll_scq(ic, ic->i_send_cq, ic->i_send_wc);
270 ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
271 poll_scq(ic, ic->i_send_cq, ic->i_send_wc);
272
273 if (rds_conn_up(conn) &&
274 (!test_bit(RDS_LL_SEND_FULL, &conn->c_flags) ||
275 test_bit(0, &conn->c_map_queued)))
276 rds_send_xmit(ic->conn);
277}
278
279static void poll_rcq(struct rds_ib_connection *ic, struct ib_cq *cq,
280 struct ib_wc *wcs,
281 struct rds_ib_ack_state *ack_state)
282{
283 int nr, i;
284 struct ib_wc *wc;
285
286 while ((nr = ib_poll_cq(cq, RDS_IB_WC_MAX, wcs)) > 0) {
287 for (i = 0; i < nr; i++) {
288 wc = wcs + i;
289 rdsdebug("wc wr_id 0x%llx status %u byte_len %u imm_data %u\n",
290 (unsigned long long)wc->wr_id, wc->status,
291 wc->byte_len, be32_to_cpu(wc->ex.imm_data));
292
293 rds_ib_recv_cqe_handler(ic, wc, ack_state);
294 }
295 }
296}
297
298static void rds_ib_tasklet_fn_recv(unsigned long data)
299{
300 struct rds_ib_connection *ic = (struct rds_ib_connection *)data;
301 struct rds_connection *conn = ic->conn;
302 struct rds_ib_device *rds_ibdev = ic->rds_ibdev;
303 struct rds_ib_ack_state state;
304
305 if (!rds_ibdev)
306 rds_conn_drop(conn);
307
308 rds_ib_stats_inc(s_ib_tasklet_call);
309
310 memset(&state, 0, sizeof(state));
311 poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state);
312 ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
313 poll_rcq(ic, ic->i_recv_cq, ic->i_recv_wc, &state);
314
315 if (state.ack_next_valid)
316 rds_ib_set_ack(ic, state.ack_next, state.ack_required);
317 if (state.ack_recv_valid && state.ack_recv > ic->i_ack_recv) {
318 rds_send_drop_acked(conn, state.ack_recv, NULL);
319 ic->i_ack_recv = state.ack_recv;
320 }
321
322 if (rds_conn_up(conn))
323 rds_ib_attempt_ack(ic);
324}
325
326static void rds_ib_qp_event_handler(struct ib_event *event, void *data)
327{
328 struct rds_connection *conn = data;
329 struct rds_ib_connection *ic = conn->c_transport_data;
330
331 rdsdebug("conn %p ic %p event %u (%s)\n", conn, ic, event->event,
332 ib_event_msg(event->event));
333
334 switch (event->event) {
335 case IB_EVENT_COMM_EST:
336 rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
337 break;
338 default:
339 rdsdebug("Fatal QP Event %u (%s) "
340 "- connection %pI4->%pI4, reconnecting\n",
341 event->event, ib_event_msg(event->event),
342 &conn->c_laddr, &conn->c_faddr);
343 rds_conn_drop(conn);
344 break;
345 }
346}
347
348static void rds_ib_cq_comp_handler_send(struct ib_cq *cq, void *context)
349{
350 struct rds_connection *conn = context;
351 struct rds_ib_connection *ic = conn->c_transport_data;
352
353 rdsdebug("conn %p cq %p\n", conn, cq);
354
355 rds_ib_stats_inc(s_ib_evt_handler_call);
356
357 tasklet_schedule(&ic->i_send_tasklet);
358}
359
360/*
361 * This needs to be very careful to not leave IS_ERR pointers around for
362 * cleanup to trip over.
363 */
364static int rds_ib_setup_qp(struct rds_connection *conn)
365{
366 struct rds_ib_connection *ic = conn->c_transport_data;
367 struct ib_device *dev = ic->i_cm_id->device;
368 struct ib_qp_init_attr attr;
369 struct ib_cq_init_attr cq_attr = {};
370 struct rds_ib_device *rds_ibdev;
371 int ret, fr_queue_space;
372
373 /*
374 * It's normal to see a null device if an incoming connection races
375 * with device removal, so we don't print a warning.
376 */
377 rds_ibdev = rds_ib_get_client_data(dev);
378 if (!rds_ibdev)
379 return -EOPNOTSUPP;
380
381 /* The fr_queue_space is currently set to 512, to add extra space on
382 * completion queue and send queue. This extra space is used for FRMR
383 * registration and invalidation work requests
384 */
385 fr_queue_space = (rds_ibdev->use_fastreg ? RDS_IB_DEFAULT_FR_WR : 0);
386
387 /* add the conn now so that connection establishment has the dev */
388 rds_ib_add_conn(rds_ibdev, conn);
389
390 if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1)
391 rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1);
392 if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1)
393 rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1);
394
395 /* Protection domain and memory range */
396 ic->i_pd = rds_ibdev->pd;
397
398 cq_attr.cqe = ic->i_send_ring.w_nr + fr_queue_space + 1;
399
400 ic->i_send_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_send,
401 rds_ib_cq_event_handler, conn,
402 &cq_attr);
403 if (IS_ERR(ic->i_send_cq)) {
404 ret = PTR_ERR(ic->i_send_cq);
405 ic->i_send_cq = NULL;
406 rdsdebug("ib_create_cq send failed: %d\n", ret);
407 goto out;
408 }
409
410 cq_attr.cqe = ic->i_recv_ring.w_nr;
411 ic->i_recv_cq = ib_create_cq(dev, rds_ib_cq_comp_handler_recv,
412 rds_ib_cq_event_handler, conn,
413 &cq_attr);
414 if (IS_ERR(ic->i_recv_cq)) {
415 ret = PTR_ERR(ic->i_recv_cq);
416 ic->i_recv_cq = NULL;
417 rdsdebug("ib_create_cq recv failed: %d\n", ret);
418 goto out;
419 }
420
421 ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
422 if (ret) {
423 rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
424 goto out;
425 }
426
427 ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
428 if (ret) {
429 rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
430 goto out;
431 }
432
433 /* XXX negotiate max send/recv with remote? */
434 memset(&attr, 0, sizeof(attr));
435 attr.event_handler = rds_ib_qp_event_handler;
436 attr.qp_context = conn;
437 /* + 1 to allow for the single ack message */
438 attr.cap.max_send_wr = ic->i_send_ring.w_nr + fr_queue_space + 1;
439 attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1;
440 attr.cap.max_send_sge = rds_ibdev->max_sge;
441 attr.cap.max_recv_sge = RDS_IB_RECV_SGE;
442 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
443 attr.qp_type = IB_QPT_RC;
444 attr.send_cq = ic->i_send_cq;
445 attr.recv_cq = ic->i_recv_cq;
446 atomic_set(&ic->i_fastreg_wrs, RDS_IB_DEFAULT_FR_WR);
447
448 /*
449 * XXX this can fail if max_*_wr is too large? Are we supposed
450 * to back off until we get a value that the hardware can support?
451 */
452 ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
453 if (ret) {
454 rdsdebug("rdma_create_qp failed: %d\n", ret);
455 goto out;
456 }
457
458 ic->i_send_hdrs = ib_dma_alloc_coherent(dev,
459 ic->i_send_ring.w_nr *
460 sizeof(struct rds_header),
461 &ic->i_send_hdrs_dma, GFP_KERNEL);
462 if (!ic->i_send_hdrs) {
463 ret = -ENOMEM;
464 rdsdebug("ib_dma_alloc_coherent send failed\n");
465 goto out;
466 }
467
468 ic->i_recv_hdrs = ib_dma_alloc_coherent(dev,
469 ic->i_recv_ring.w_nr *
470 sizeof(struct rds_header),
471 &ic->i_recv_hdrs_dma, GFP_KERNEL);
472 if (!ic->i_recv_hdrs) {
473 ret = -ENOMEM;
474 rdsdebug("ib_dma_alloc_coherent recv failed\n");
475 goto out;
476 }
477
478 ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header),
479 &ic->i_ack_dma, GFP_KERNEL);
480 if (!ic->i_ack) {
481 ret = -ENOMEM;
482 rdsdebug("ib_dma_alloc_coherent ack failed\n");
483 goto out;
484 }
485
486 ic->i_sends = vzalloc_node(ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work),
487 ibdev_to_node(dev));
488 if (!ic->i_sends) {
489 ret = -ENOMEM;
490 rdsdebug("send allocation failed\n");
491 goto out;
492 }
493
494 ic->i_recvs = vzalloc_node(ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work),
495 ibdev_to_node(dev));
496 if (!ic->i_recvs) {
497 ret = -ENOMEM;
498 rdsdebug("recv allocation failed\n");
499 goto out;
500 }
501
502 rds_ib_recv_init_ack(ic);
503
504 rdsdebug("conn %p pd %p cq %p %p\n", conn, ic->i_pd,
505 ic->i_send_cq, ic->i_recv_cq);
506
507out:
508 rds_ib_dev_put(rds_ibdev);
509 return ret;
510}
511
512static u32 rds_ib_protocol_compatible(struct rdma_cm_event *event)
513{
514 const struct rds_ib_connect_private *dp = event->param.conn.private_data;
515 u16 common;
516 u32 version = 0;
517
518 /*
519 * rdma_cm private data is odd - when there is any private data in the
520 * request, we will be given a pretty large buffer without telling us the
521 * original size. The only way to tell the difference is by looking at
522 * the contents, which are initialized to zero.
523 * If the protocol version fields aren't set, this is a connection attempt
524 * from an older version. This could could be 3.0 or 2.0 - we can't tell.
525 * We really should have changed this for OFED 1.3 :-(
526 */
527
528 /* Be paranoid. RDS always has privdata */
529 if (!event->param.conn.private_data_len) {
530 printk(KERN_NOTICE "RDS incoming connection has no private data, "
531 "rejecting\n");
532 return 0;
533 }
534
535 /* Even if len is crap *now* I still want to check it. -ASG */
536 if (event->param.conn.private_data_len < sizeof (*dp) ||
537 dp->dp_protocol_major == 0)
538 return RDS_PROTOCOL_3_0;
539
540 common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IB_SUPPORTED_PROTOCOLS;
541 if (dp->dp_protocol_major == 3 && common) {
542 version = RDS_PROTOCOL_3_0;
543 while ((common >>= 1) != 0)
544 version++;
545 } else
546 printk_ratelimited(KERN_NOTICE "RDS: Connection from %pI4 using incompatible protocol version %u.%u\n",
547 &dp->dp_saddr,
548 dp->dp_protocol_major,
549 dp->dp_protocol_minor);
550 return version;
551}
552
553int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
554 struct rdma_cm_event *event)
555{
556 __be64 lguid = cm_id->route.path_rec->sgid.global.interface_id;
557 __be64 fguid = cm_id->route.path_rec->dgid.global.interface_id;
558 const struct rds_ib_connect_private *dp = event->param.conn.private_data;
559 struct rds_ib_connect_private dp_rep;
560 struct rds_connection *conn = NULL;
561 struct rds_ib_connection *ic = NULL;
562 struct rdma_conn_param conn_param;
563 u32 version;
564 int err = 1, destroy = 1;
565
566 /* Check whether the remote protocol version matches ours. */
567 version = rds_ib_protocol_compatible(event);
568 if (!version)
569 goto out;
570
571 rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u lguid 0x%llx fguid "
572 "0x%llx\n", &dp->dp_saddr, &dp->dp_daddr,
573 RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version),
574 (unsigned long long)be64_to_cpu(lguid),
575 (unsigned long long)be64_to_cpu(fguid));
576
577 /* RDS/IB is not currently netns aware, thus init_net */
578 conn = rds_conn_create(&init_net, dp->dp_daddr, dp->dp_saddr,
579 &rds_ib_transport, GFP_KERNEL);
580 if (IS_ERR(conn)) {
581 rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn));
582 conn = NULL;
583 goto out;
584 }
585
586 /*
587 * The connection request may occur while the
588 * previous connection exist, e.g. in case of failover.
589 * But as connections may be initiated simultaneously
590 * by both hosts, we have a random backoff mechanism -
591 * see the comment above rds_queue_reconnect()
592 */
593 mutex_lock(&conn->c_cm_lock);
594 if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
595 if (rds_conn_state(conn) == RDS_CONN_UP) {
596 rdsdebug("incoming connect while connecting\n");
597 rds_conn_drop(conn);
598 rds_ib_stats_inc(s_ib_listen_closed_stale);
599 } else
600 if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
601 /* Wait and see - our connect may still be succeeding */
602 rds_ib_stats_inc(s_ib_connect_raced);
603 }
604 goto out;
605 }
606
607 ic = conn->c_transport_data;
608
609 rds_ib_set_protocol(conn, version);
610 rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
611
612 /* If the peer gave us the last packet it saw, process this as if
613 * we had received a regular ACK. */
614 if (dp->dp_ack_seq)
615 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
616
617 BUG_ON(cm_id->context);
618 BUG_ON(ic->i_cm_id);
619
620 ic->i_cm_id = cm_id;
621 cm_id->context = conn;
622
623 /* We got halfway through setting up the ib_connection, if we
624 * fail now, we have to take the long route out of this mess. */
625 destroy = 0;
626
627 err = rds_ib_setup_qp(conn);
628 if (err) {
629 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", err);
630 goto out;
631 }
632
633 rds_ib_cm_fill_conn_param(conn, &conn_param, &dp_rep, version,
634 event->param.conn.responder_resources,
635 event->param.conn.initiator_depth);
636
637 /* rdma_accept() calls rdma_reject() internally if it fails */
638 err = rdma_accept(cm_id, &conn_param);
639 if (err)
640 rds_ib_conn_error(conn, "rdma_accept failed (%d)\n", err);
641
642out:
643 if (conn)
644 mutex_unlock(&conn->c_cm_lock);
645 if (err)
646 rdma_reject(cm_id, NULL, 0);
647 return destroy;
648}
649
650
651int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id)
652{
653 struct rds_connection *conn = cm_id->context;
654 struct rds_ib_connection *ic = conn->c_transport_data;
655 struct rdma_conn_param conn_param;
656 struct rds_ib_connect_private dp;
657 int ret;
658
659 /* If the peer doesn't do protocol negotiation, we must
660 * default to RDSv3.0 */
661 rds_ib_set_protocol(conn, RDS_PROTOCOL_3_0);
662 ic->i_flowctl = rds_ib_sysctl_flow_control; /* advertise flow control */
663
664 ret = rds_ib_setup_qp(conn);
665 if (ret) {
666 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret);
667 goto out;
668 }
669
670 rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION,
671 UINT_MAX, UINT_MAX);
672 ret = rdma_connect(cm_id, &conn_param);
673 if (ret)
674 rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret);
675
676out:
677 /* Beware - returning non-zero tells the rdma_cm to destroy
678 * the cm_id. We should certainly not do it as long as we still
679 * "own" the cm_id. */
680 if (ret) {
681 if (ic->i_cm_id == cm_id)
682 ret = 0;
683 }
684 return ret;
685}
686
687int rds_ib_conn_connect(struct rds_connection *conn)
688{
689 struct rds_ib_connection *ic = conn->c_transport_data;
690 struct sockaddr_in src, dest;
691 int ret;
692
693 /* XXX I wonder what affect the port space has */
694 /* delegate cm event handler to rdma_transport */
695 ic->i_cm_id = rdma_create_id(&init_net, rds_rdma_cm_event_handler, conn,
696 RDMA_PS_TCP, IB_QPT_RC);
697 if (IS_ERR(ic->i_cm_id)) {
698 ret = PTR_ERR(ic->i_cm_id);
699 ic->i_cm_id = NULL;
700 rdsdebug("rdma_create_id() failed: %d\n", ret);
701 goto out;
702 }
703
704 rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
705
706 src.sin_family = AF_INET;
707 src.sin_addr.s_addr = (__force u32)conn->c_laddr;
708 src.sin_port = (__force u16)htons(0);
709
710 dest.sin_family = AF_INET;
711 dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
712 dest.sin_port = (__force u16)htons(RDS_PORT);
713
714 ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
715 (struct sockaddr *)&dest,
716 RDS_RDMA_RESOLVE_TIMEOUT_MS);
717 if (ret) {
718 rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
719 ret);
720 rdma_destroy_id(ic->i_cm_id);
721 ic->i_cm_id = NULL;
722 }
723
724out:
725 return ret;
726}
727
728/*
729 * This is so careful about only cleaning up resources that were built up
730 * so that it can be called at any point during startup. In fact it
731 * can be called multiple times for a given connection.
732 */
733void rds_ib_conn_shutdown(struct rds_connection *conn)
734{
735 struct rds_ib_connection *ic = conn->c_transport_data;
736 int err = 0;
737
738 rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
739 ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
740 ic->i_cm_id ? ic->i_cm_id->qp : NULL);
741
742 if (ic->i_cm_id) {
743 struct ib_device *dev = ic->i_cm_id->device;
744
745 rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
746 err = rdma_disconnect(ic->i_cm_id);
747 if (err) {
748 /* Actually this may happen quite frequently, when
749 * an outgoing connect raced with an incoming connect.
750 */
751 rdsdebug("failed to disconnect, cm: %p err %d\n",
752 ic->i_cm_id, err);
753 }
754
755 /*
756 * We want to wait for tx and rx completion to finish
757 * before we tear down the connection, but we have to be
758 * careful not to get stuck waiting on a send ring that
759 * only has unsignaled sends in it. We've shutdown new
760 * sends before getting here so by waiting for signaled
761 * sends to complete we're ensured that there will be no
762 * more tx processing.
763 */
764 wait_event(rds_ib_ring_empty_wait,
765 rds_ib_ring_empty(&ic->i_recv_ring) &&
766 (atomic_read(&ic->i_signaled_sends) == 0) &&
767 (atomic_read(&ic->i_fastreg_wrs) == RDS_IB_DEFAULT_FR_WR));
768 tasklet_kill(&ic->i_send_tasklet);
769 tasklet_kill(&ic->i_recv_tasklet);
770
771 /* first destroy the ib state that generates callbacks */
772 if (ic->i_cm_id->qp)
773 rdma_destroy_qp(ic->i_cm_id);
774 if (ic->i_send_cq)
775 ib_destroy_cq(ic->i_send_cq);
776 if (ic->i_recv_cq)
777 ib_destroy_cq(ic->i_recv_cq);
778
779 /* then free the resources that ib callbacks use */
780 if (ic->i_send_hdrs)
781 ib_dma_free_coherent(dev,
782 ic->i_send_ring.w_nr *
783 sizeof(struct rds_header),
784 ic->i_send_hdrs,
785 ic->i_send_hdrs_dma);
786
787 if (ic->i_recv_hdrs)
788 ib_dma_free_coherent(dev,
789 ic->i_recv_ring.w_nr *
790 sizeof(struct rds_header),
791 ic->i_recv_hdrs,
792 ic->i_recv_hdrs_dma);
793
794 if (ic->i_ack)
795 ib_dma_free_coherent(dev, sizeof(struct rds_header),
796 ic->i_ack, ic->i_ack_dma);
797
798 if (ic->i_sends)
799 rds_ib_send_clear_ring(ic);
800 if (ic->i_recvs)
801 rds_ib_recv_clear_ring(ic);
802
803 rdma_destroy_id(ic->i_cm_id);
804
805 /*
806 * Move connection back to the nodev list.
807 */
808 if (ic->rds_ibdev)
809 rds_ib_remove_conn(ic->rds_ibdev, conn);
810
811 ic->i_cm_id = NULL;
812 ic->i_pd = NULL;
813 ic->i_send_cq = NULL;
814 ic->i_recv_cq = NULL;
815 ic->i_send_hdrs = NULL;
816 ic->i_recv_hdrs = NULL;
817 ic->i_ack = NULL;
818 }
819 BUG_ON(ic->rds_ibdev);
820
821 /* Clear pending transmit */
822 if (ic->i_data_op) {
823 struct rds_message *rm;
824
825 rm = container_of(ic->i_data_op, struct rds_message, data);
826 rds_message_put(rm);
827 ic->i_data_op = NULL;
828 }
829
830 /* Clear the ACK state */
831 clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
832#ifdef KERNEL_HAS_ATOMIC64
833 atomic64_set(&ic->i_ack_next, 0);
834#else
835 ic->i_ack_next = 0;
836#endif
837 ic->i_ack_recv = 0;
838
839 /* Clear flow control state */
840 ic->i_flowctl = 0;
841 atomic_set(&ic->i_credits, 0);
842
843 rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
844 rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
845
846 if (ic->i_ibinc) {
847 rds_inc_put(&ic->i_ibinc->ii_inc);
848 ic->i_ibinc = NULL;
849 }
850
851 vfree(ic->i_sends);
852 ic->i_sends = NULL;
853 vfree(ic->i_recvs);
854 ic->i_recvs = NULL;
855}
856
857int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp)
858{
859 struct rds_ib_connection *ic;
860 unsigned long flags;
861 int ret;
862
863 /* XXX too lazy? */
864 ic = kzalloc(sizeof(struct rds_ib_connection), gfp);
865 if (!ic)
866 return -ENOMEM;
867
868 ret = rds_ib_recv_alloc_caches(ic);
869 if (ret) {
870 kfree(ic);
871 return ret;
872 }
873
874 INIT_LIST_HEAD(&ic->ib_node);
875 tasklet_init(&ic->i_send_tasklet, rds_ib_tasklet_fn_send,
876 (unsigned long)ic);
877 tasklet_init(&ic->i_recv_tasklet, rds_ib_tasklet_fn_recv,
878 (unsigned long)ic);
879 mutex_init(&ic->i_recv_mutex);
880#ifndef KERNEL_HAS_ATOMIC64
881 spin_lock_init(&ic->i_ack_lock);
882#endif
883 atomic_set(&ic->i_signaled_sends, 0);
884
885 /*
886 * rds_ib_conn_shutdown() waits for these to be emptied so they
887 * must be initialized before it can be called.
888 */
889 rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
890 rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
891
892 ic->conn = conn;
893 conn->c_transport_data = ic;
894
895 spin_lock_irqsave(&ib_nodev_conns_lock, flags);
896 list_add_tail(&ic->ib_node, &ib_nodev_conns);
897 spin_unlock_irqrestore(&ib_nodev_conns_lock, flags);
898
899
900 rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
901 return 0;
902}
903
904/*
905 * Free a connection. Connection must be shut down and not set for reconnect.
906 */
907void rds_ib_conn_free(void *arg)
908{
909 struct rds_ib_connection *ic = arg;
910 spinlock_t *lock_ptr;
911
912 rdsdebug("ic %p\n", ic);
913
914 /*
915 * Conn is either on a dev's list or on the nodev list.
916 * A race with shutdown() or connect() would cause problems
917 * (since rds_ibdev would change) but that should never happen.
918 */
919 lock_ptr = ic->rds_ibdev ? &ic->rds_ibdev->spinlock : &ib_nodev_conns_lock;
920
921 spin_lock_irq(lock_ptr);
922 list_del(&ic->ib_node);
923 spin_unlock_irq(lock_ptr);
924
925 rds_ib_recv_free_caches(ic);
926
927 kfree(ic);
928}
929
930
931/*
932 * An error occurred on the connection
933 */
934void
935__rds_ib_conn_error(struct rds_connection *conn, const char *fmt, ...)
936{
937 va_list ap;
938
939 rds_conn_drop(conn);
940
941 va_start(ap, fmt);
942 vprintk(fmt, ap);
943 va_end(ap);
944}