blob: f8e40e1a6038882eb5950da72506c9f70cbd7045 [file] [log] [blame]
Andy Groverec162272009-02-24 15:30:30 +00001/*
2 * Copyright (c) 2006 Oracle. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33#include <linux/kernel.h>
34#include <linux/in.h>
35#include <linux/vmalloc.h>
36
37#include "rds.h"
38#include "ib.h"
39
40/*
41 * Set the selected protocol version
42 */
43static void rds_ib_set_protocol(struct rds_connection *conn, unsigned int version)
44{
45 conn->c_version = version;
46}
47
48/*
49 * Set up flow control
50 */
51static void rds_ib_set_flow_control(struct rds_connection *conn, u32 credits)
52{
53 struct rds_ib_connection *ic = conn->c_transport_data;
54
55 if (rds_ib_sysctl_flow_control && credits != 0) {
56 /* We're doing flow control */
57 ic->i_flowctl = 1;
58 rds_ib_send_add_credits(conn, credits);
59 } else {
60 ic->i_flowctl = 0;
61 }
62}
63
64/*
65 * Tune RNR behavior. Without flow control, we use a rather
66 * low timeout, but not the absolute minimum - this should
67 * be tunable.
68 *
69 * We already set the RNR retry count to 7 (which is the
70 * smallest infinite number :-) above.
71 * If flow control is off, we want to change this back to 0
72 * so that we learn quickly when our credit accounting is
73 * buggy.
74 *
75 * Caller passes in a qp_attr pointer - don't waste stack spacv
76 * by allocation this twice.
77 */
78static void
79rds_ib_tune_rnr(struct rds_ib_connection *ic, struct ib_qp_attr *attr)
80{
81 int ret;
82
83 attr->min_rnr_timer = IB_RNR_TIMER_000_32;
84 ret = ib_modify_qp(ic->i_cm_id->qp, attr, IB_QP_MIN_RNR_TIMER);
85 if (ret)
86 printk(KERN_NOTICE "ib_modify_qp(IB_QP_MIN_RNR_TIMER): err=%d\n", -ret);
87}
88
89/*
90 * Connection established.
91 * We get here for both outgoing and incoming connection.
92 */
93void rds_ib_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event)
94{
95 const struct rds_ib_connect_private *dp = NULL;
96 struct rds_ib_connection *ic = conn->c_transport_data;
97 struct rds_ib_device *rds_ibdev;
98 struct ib_qp_attr qp_attr;
99 int err;
100
101 if (event->param.conn.private_data_len) {
102 dp = event->param.conn.private_data;
103
104 rds_ib_set_protocol(conn,
105 RDS_PROTOCOL(dp->dp_protocol_major,
106 dp->dp_protocol_minor));
107 rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
108 }
109
110 printk(KERN_NOTICE "RDS/IB: connected to %pI4 version %u.%u%s\n",
111 &conn->c_laddr,
112 RDS_PROTOCOL_MAJOR(conn->c_version),
113 RDS_PROTOCOL_MINOR(conn->c_version),
114 ic->i_flowctl ? ", flow control" : "");
115
116 /* Tune RNR behavior */
117 rds_ib_tune_rnr(ic, &qp_attr);
118
119 qp_attr.qp_state = IB_QPS_RTS;
120 err = ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE);
121 if (err)
122 printk(KERN_NOTICE "ib_modify_qp(IB_QP_STATE, RTS): err=%d\n", err);
123
124 /* update ib_device with this local ipaddr & conn */
125 rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_client);
126 err = rds_ib_update_ipaddr(rds_ibdev, conn->c_laddr);
127 if (err)
128 printk(KERN_ERR "rds_ib_update_ipaddr failed (%d)\n", err);
Andy Grover745cbcc2009-04-01 08:20:19 +0000129 rds_ib_add_conn(rds_ibdev, conn);
Andy Groverec162272009-02-24 15:30:30 +0000130
131 /* If the peer gave us the last packet it saw, process this as if
132 * we had received a regular ACK. */
133 if (dp && dp->dp_ack_seq)
134 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
135
136 rds_connect_complete(conn);
137}
138
139static void rds_ib_cm_fill_conn_param(struct rds_connection *conn,
140 struct rdma_conn_param *conn_param,
141 struct rds_ib_connect_private *dp,
142 u32 protocol_version)
143{
144 memset(conn_param, 0, sizeof(struct rdma_conn_param));
145 /* XXX tune these? */
146 conn_param->responder_resources = 1;
147 conn_param->initiator_depth = 1;
148 conn_param->retry_count = 7;
149 conn_param->rnr_retry_count = 7;
150
151 if (dp) {
152 struct rds_ib_connection *ic = conn->c_transport_data;
153
154 memset(dp, 0, sizeof(*dp));
155 dp->dp_saddr = conn->c_laddr;
156 dp->dp_daddr = conn->c_faddr;
157 dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version);
158 dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version);
159 dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS);
160 dp->dp_ack_seq = rds_ib_piggyb_ack(ic);
161
162 /* Advertise flow control */
163 if (ic->i_flowctl) {
164 unsigned int credits;
165
166 credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits));
167 dp->dp_credit = cpu_to_be32(credits);
168 atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits);
169 }
170
171 conn_param->private_data = dp;
172 conn_param->private_data_len = sizeof(*dp);
173 }
174}
175
176static void rds_ib_cq_event_handler(struct ib_event *event, void *data)
177{
178 rdsdebug("event %u data %p\n", event->event, data);
179}
180
181static void rds_ib_qp_event_handler(struct ib_event *event, void *data)
182{
183 struct rds_connection *conn = data;
184 struct rds_ib_connection *ic = conn->c_transport_data;
185
186 rdsdebug("conn %p ic %p event %u\n", conn, ic, event->event);
187
188 switch (event->event) {
189 case IB_EVENT_COMM_EST:
190 rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
191 break;
192 default:
193 printk(KERN_WARNING "RDS/ib: unhandled QP event %u "
194 "on connection to %pI4\n", event->event,
195 &conn->c_faddr);
196 break;
197 }
198}
199
200/*
201 * This needs to be very careful to not leave IS_ERR pointers around for
202 * cleanup to trip over.
203 */
204static int rds_ib_setup_qp(struct rds_connection *conn)
205{
206 struct rds_ib_connection *ic = conn->c_transport_data;
207 struct ib_device *dev = ic->i_cm_id->device;
208 struct ib_qp_init_attr attr;
209 struct rds_ib_device *rds_ibdev;
210 int ret;
211
212 /* rds_ib_add_one creates a rds_ib_device object per IB device,
213 * and allocates a protection domain, memory range and FMR pool
214 * for each. If that fails for any reason, it will not register
215 * the rds_ibdev at all.
216 */
217 rds_ibdev = ib_get_client_data(dev, &rds_ib_client);
218 if (rds_ibdev == NULL) {
219 if (printk_ratelimit())
220 printk(KERN_NOTICE "RDS/IB: No client_data for device %s\n",
221 dev->name);
222 return -EOPNOTSUPP;
223 }
224
225 if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1)
226 rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1);
227 if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1)
228 rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1);
229
230 /* Protection domain and memory range */
231 ic->i_pd = rds_ibdev->pd;
232 ic->i_mr = rds_ibdev->mr;
233
234 ic->i_send_cq = ib_create_cq(dev, rds_ib_send_cq_comp_handler,
235 rds_ib_cq_event_handler, conn,
236 ic->i_send_ring.w_nr + 1, 0);
237 if (IS_ERR(ic->i_send_cq)) {
238 ret = PTR_ERR(ic->i_send_cq);
239 ic->i_send_cq = NULL;
240 rdsdebug("ib_create_cq send failed: %d\n", ret);
241 goto out;
242 }
243
244 ic->i_recv_cq = ib_create_cq(dev, rds_ib_recv_cq_comp_handler,
245 rds_ib_cq_event_handler, conn,
246 ic->i_recv_ring.w_nr, 0);
247 if (IS_ERR(ic->i_recv_cq)) {
248 ret = PTR_ERR(ic->i_recv_cq);
249 ic->i_recv_cq = NULL;
250 rdsdebug("ib_create_cq recv failed: %d\n", ret);
251 goto out;
252 }
253
254 ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP);
255 if (ret) {
256 rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
257 goto out;
258 }
259
260 ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED);
261 if (ret) {
262 rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
263 goto out;
264 }
265
266 /* XXX negotiate max send/recv with remote? */
267 memset(&attr, 0, sizeof(attr));
268 attr.event_handler = rds_ib_qp_event_handler;
269 attr.qp_context = conn;
270 /* + 1 to allow for the single ack message */
271 attr.cap.max_send_wr = ic->i_send_ring.w_nr + 1;
272 attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1;
273 attr.cap.max_send_sge = rds_ibdev->max_sge;
274 attr.cap.max_recv_sge = RDS_IB_RECV_SGE;
275 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
276 attr.qp_type = IB_QPT_RC;
277 attr.send_cq = ic->i_send_cq;
278 attr.recv_cq = ic->i_recv_cq;
279
280 /*
281 * XXX this can fail if max_*_wr is too large? Are we supposed
282 * to back off until we get a value that the hardware can support?
283 */
284 ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr);
285 if (ret) {
286 rdsdebug("rdma_create_qp failed: %d\n", ret);
287 goto out;
288 }
289
290 ic->i_send_hdrs = ib_dma_alloc_coherent(dev,
291 ic->i_send_ring.w_nr *
292 sizeof(struct rds_header),
293 &ic->i_send_hdrs_dma, GFP_KERNEL);
294 if (ic->i_send_hdrs == NULL) {
295 ret = -ENOMEM;
296 rdsdebug("ib_dma_alloc_coherent send failed\n");
297 goto out;
298 }
299
300 ic->i_recv_hdrs = ib_dma_alloc_coherent(dev,
301 ic->i_recv_ring.w_nr *
302 sizeof(struct rds_header),
303 &ic->i_recv_hdrs_dma, GFP_KERNEL);
304 if (ic->i_recv_hdrs == NULL) {
305 ret = -ENOMEM;
306 rdsdebug("ib_dma_alloc_coherent recv failed\n");
307 goto out;
308 }
309
310 ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header),
311 &ic->i_ack_dma, GFP_KERNEL);
312 if (ic->i_ack == NULL) {
313 ret = -ENOMEM;
314 rdsdebug("ib_dma_alloc_coherent ack failed\n");
315 goto out;
316 }
317
318 ic->i_sends = vmalloc(ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work));
319 if (ic->i_sends == NULL) {
320 ret = -ENOMEM;
321 rdsdebug("send allocation failed\n");
322 goto out;
323 }
324 rds_ib_send_init_ring(ic);
325
326 ic->i_recvs = vmalloc(ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work));
327 if (ic->i_recvs == NULL) {
328 ret = -ENOMEM;
329 rdsdebug("recv allocation failed\n");
330 goto out;
331 }
332
333 rds_ib_recv_init_ring(ic);
334 rds_ib_recv_init_ack(ic);
335
336 /* Post receive buffers - as a side effect, this will update
337 * the posted credit count. */
338 rds_ib_recv_refill(conn, GFP_KERNEL, GFP_HIGHUSER, 1);
339
340 rdsdebug("conn %p pd %p mr %p cq %p %p\n", conn, ic->i_pd, ic->i_mr,
341 ic->i_send_cq, ic->i_recv_cq);
342
343out:
344 return ret;
345}
346
347static u32 rds_ib_protocol_compatible(const struct rds_ib_connect_private *dp)
348{
349 u16 common;
350 u32 version = 0;
351
352 /* rdma_cm private data is odd - when there is any private data in the
353 * request, we will be given a pretty large buffer without telling us the
354 * original size. The only way to tell the difference is by looking at
355 * the contents, which are initialized to zero.
356 * If the protocol version fields aren't set, this is a connection attempt
357 * from an older version. This could could be 3.0 or 2.0 - we can't tell.
358 * We really should have changed this for OFED 1.3 :-( */
359 if (dp->dp_protocol_major == 0)
360 return RDS_PROTOCOL_3_0;
361
362 common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IB_SUPPORTED_PROTOCOLS;
363 if (dp->dp_protocol_major == 3 && common) {
364 version = RDS_PROTOCOL_3_0;
365 while ((common >>= 1) != 0)
366 version++;
367 } else if (printk_ratelimit()) {
368 printk(KERN_NOTICE "RDS: Connection from %pI4 using "
369 "incompatible protocol version %u.%u\n",
370 &dp->dp_saddr,
371 dp->dp_protocol_major,
372 dp->dp_protocol_minor);
373 }
374 return version;
375}
376
377int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
378 struct rdma_cm_event *event)
379{
380 __be64 lguid = cm_id->route.path_rec->sgid.global.interface_id;
381 __be64 fguid = cm_id->route.path_rec->dgid.global.interface_id;
382 const struct rds_ib_connect_private *dp = event->param.conn.private_data;
383 struct rds_ib_connect_private dp_rep;
384 struct rds_connection *conn = NULL;
385 struct rds_ib_connection *ic = NULL;
386 struct rdma_conn_param conn_param;
387 u32 version;
388 int err, destroy = 1;
389
390 /* Check whether the remote protocol version matches ours. */
391 version = rds_ib_protocol_compatible(dp);
392 if (!version)
393 goto out;
394
395 rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u lguid 0x%llx fguid "
396 "0x%llx\n", &dp->dp_saddr, &dp->dp_daddr,
397 RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version),
398 (unsigned long long)be64_to_cpu(lguid),
399 (unsigned long long)be64_to_cpu(fguid));
400
401 conn = rds_conn_create(dp->dp_daddr, dp->dp_saddr, &rds_ib_transport,
402 GFP_KERNEL);
403 if (IS_ERR(conn)) {
404 rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn));
405 conn = NULL;
406 goto out;
407 }
408
409 /*
410 * The connection request may occur while the
411 * previous connection exist, e.g. in case of failover.
412 * But as connections may be initiated simultaneously
413 * by both hosts, we have a random backoff mechanism -
414 * see the comment above rds_queue_reconnect()
415 */
416 mutex_lock(&conn->c_cm_lock);
417 if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
418 if (rds_conn_state(conn) == RDS_CONN_UP) {
419 rdsdebug("incoming connect while connecting\n");
420 rds_conn_drop(conn);
421 rds_ib_stats_inc(s_ib_listen_closed_stale);
422 } else
423 if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
424 /* Wait and see - our connect may still be succeeding */
425 rds_ib_stats_inc(s_ib_connect_raced);
426 }
427 mutex_unlock(&conn->c_cm_lock);
428 goto out;
429 }
430
431 ic = conn->c_transport_data;
432
433 rds_ib_set_protocol(conn, version);
434 rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
435
436 /* If the peer gave us the last packet it saw, process this as if
437 * we had received a regular ACK. */
438 if (dp->dp_ack_seq)
439 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
440
441 BUG_ON(cm_id->context);
442 BUG_ON(ic->i_cm_id);
443
444 ic->i_cm_id = cm_id;
445 cm_id->context = conn;
446
447 /* We got halfway through setting up the ib_connection, if we
448 * fail now, we have to take the long route out of this mess. */
449 destroy = 0;
450
451 err = rds_ib_setup_qp(conn);
452 if (err) {
453 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", err);
454 goto out;
455 }
456
457 rds_ib_cm_fill_conn_param(conn, &conn_param, &dp_rep, version);
458
459 /* rdma_accept() calls rdma_reject() internally if it fails */
460 err = rdma_accept(cm_id, &conn_param);
461 mutex_unlock(&conn->c_cm_lock);
462 if (err) {
463 rds_ib_conn_error(conn, "rdma_accept failed (%d)\n", err);
464 goto out;
465 }
466
467 return 0;
468
469out:
470 rdma_reject(cm_id, NULL, 0);
471 return destroy;
472}
473
474
475int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id)
476{
477 struct rds_connection *conn = cm_id->context;
478 struct rds_ib_connection *ic = conn->c_transport_data;
479 struct rdma_conn_param conn_param;
480 struct rds_ib_connect_private dp;
481 int ret;
482
483 /* If the peer doesn't do protocol negotiation, we must
484 * default to RDSv3.0 */
485 rds_ib_set_protocol(conn, RDS_PROTOCOL_3_0);
486 ic->i_flowctl = rds_ib_sysctl_flow_control; /* advertise flow control */
487
488 ret = rds_ib_setup_qp(conn);
489 if (ret) {
490 rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret);
491 goto out;
492 }
493
494 rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION);
495
496 ret = rdma_connect(cm_id, &conn_param);
497 if (ret)
498 rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret);
499
500out:
501 /* Beware - returning non-zero tells the rdma_cm to destroy
502 * the cm_id. We should certainly not do it as long as we still
503 * "own" the cm_id. */
504 if (ret) {
505 if (ic->i_cm_id == cm_id)
506 ret = 0;
507 }
508 return ret;
509}
510
511int rds_ib_conn_connect(struct rds_connection *conn)
512{
513 struct rds_ib_connection *ic = conn->c_transport_data;
514 struct sockaddr_in src, dest;
515 int ret;
516
517 /* XXX I wonder what affect the port space has */
518 /* delegate cm event handler to rdma_transport */
519 ic->i_cm_id = rdma_create_id(rds_rdma_cm_event_handler, conn,
520 RDMA_PS_TCP);
521 if (IS_ERR(ic->i_cm_id)) {
522 ret = PTR_ERR(ic->i_cm_id);
523 ic->i_cm_id = NULL;
524 rdsdebug("rdma_create_id() failed: %d\n", ret);
525 goto out;
526 }
527
528 rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
529
530 src.sin_family = AF_INET;
531 src.sin_addr.s_addr = (__force u32)conn->c_laddr;
532 src.sin_port = (__force u16)htons(0);
533
534 dest.sin_family = AF_INET;
535 dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
536 dest.sin_port = (__force u16)htons(RDS_PORT);
537
538 ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
539 (struct sockaddr *)&dest,
540 RDS_RDMA_RESOLVE_TIMEOUT_MS);
541 if (ret) {
542 rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
543 ret);
544 rdma_destroy_id(ic->i_cm_id);
545 ic->i_cm_id = NULL;
546 }
547
548out:
549 return ret;
550}
551
552/*
553 * This is so careful about only cleaning up resources that were built up
554 * so that it can be called at any point during startup. In fact it
555 * can be called multiple times for a given connection.
556 */
557void rds_ib_conn_shutdown(struct rds_connection *conn)
558{
559 struct rds_ib_connection *ic = conn->c_transport_data;
560 int err = 0;
561
562 rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
563 ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
564 ic->i_cm_id ? ic->i_cm_id->qp : NULL);
565
566 if (ic->i_cm_id) {
567 struct ib_device *dev = ic->i_cm_id->device;
568
569 rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
570 err = rdma_disconnect(ic->i_cm_id);
571 if (err) {
572 /* Actually this may happen quite frequently, when
573 * an outgoing connect raced with an incoming connect.
574 */
575 rdsdebug("failed to disconnect, cm: %p err %d\n",
576 ic->i_cm_id, err);
577 }
578
579 wait_event(rds_ib_ring_empty_wait,
580 rds_ib_ring_empty(&ic->i_send_ring) &&
581 rds_ib_ring_empty(&ic->i_recv_ring));
582
583 if (ic->i_send_hdrs)
584 ib_dma_free_coherent(dev,
585 ic->i_send_ring.w_nr *
586 sizeof(struct rds_header),
587 ic->i_send_hdrs,
588 ic->i_send_hdrs_dma);
589
590 if (ic->i_recv_hdrs)
591 ib_dma_free_coherent(dev,
592 ic->i_recv_ring.w_nr *
593 sizeof(struct rds_header),
594 ic->i_recv_hdrs,
595 ic->i_recv_hdrs_dma);
596
597 if (ic->i_ack)
598 ib_dma_free_coherent(dev, sizeof(struct rds_header),
599 ic->i_ack, ic->i_ack_dma);
600
601 if (ic->i_sends)
602 rds_ib_send_clear_ring(ic);
603 if (ic->i_recvs)
604 rds_ib_recv_clear_ring(ic);
605
606 if (ic->i_cm_id->qp)
607 rdma_destroy_qp(ic->i_cm_id);
608 if (ic->i_send_cq)
609 ib_destroy_cq(ic->i_send_cq);
610 if (ic->i_recv_cq)
611 ib_destroy_cq(ic->i_recv_cq);
612 rdma_destroy_id(ic->i_cm_id);
613
614 /*
615 * Move connection back to the nodev list.
616 */
Andy Grover745cbcc2009-04-01 08:20:19 +0000617 if (ic->rds_ibdev)
618 rds_ib_remove_conn(ic->rds_ibdev, conn);
Andy Groverec162272009-02-24 15:30:30 +0000619
620 ic->i_cm_id = NULL;
621 ic->i_pd = NULL;
622 ic->i_mr = NULL;
623 ic->i_send_cq = NULL;
624 ic->i_recv_cq = NULL;
625 ic->i_send_hdrs = NULL;
626 ic->i_recv_hdrs = NULL;
627 ic->i_ack = NULL;
628 }
629 BUG_ON(ic->rds_ibdev);
630
631 /* Clear pending transmit */
632 if (ic->i_rm) {
633 rds_message_put(ic->i_rm);
634 ic->i_rm = NULL;
635 }
636
637 /* Clear the ACK state */
638 clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
Andy Grover8cbd9602009-04-01 08:20:20 +0000639#ifdef KERNEL_HAS_ATOMIC64
640 atomic64_set(&ic->i_ack_next, 0);
641#else
642 ic->i_ack_next = 0;
643#endif
Andy Groverec162272009-02-24 15:30:30 +0000644 ic->i_ack_recv = 0;
645
646 /* Clear flow control state */
647 ic->i_flowctl = 0;
648 atomic_set(&ic->i_credits, 0);
649
650 rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
651 rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
652
653 if (ic->i_ibinc) {
654 rds_inc_put(&ic->i_ibinc->ii_inc);
655 ic->i_ibinc = NULL;
656 }
657
658 vfree(ic->i_sends);
659 ic->i_sends = NULL;
660 vfree(ic->i_recvs);
661 ic->i_recvs = NULL;
662}
663
664int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp)
665{
666 struct rds_ib_connection *ic;
667 unsigned long flags;
668
669 /* XXX too lazy? */
670 ic = kzalloc(sizeof(struct rds_ib_connection), GFP_KERNEL);
671 if (ic == NULL)
672 return -ENOMEM;
673
674 INIT_LIST_HEAD(&ic->ib_node);
675 mutex_init(&ic->i_recv_mutex);
Andy Grover8cbd9602009-04-01 08:20:20 +0000676#ifndef KERNEL_HAS_ATOMIC64
677 spin_lock_init(&ic->i_ack_lock);
678#endif
Andy Groverec162272009-02-24 15:30:30 +0000679
680 /*
681 * rds_ib_conn_shutdown() waits for these to be emptied so they
682 * must be initialized before it can be called.
683 */
684 rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr);
685 rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr);
686
687 ic->conn = conn;
688 conn->c_transport_data = ic;
689
690 spin_lock_irqsave(&ib_nodev_conns_lock, flags);
691 list_add_tail(&ic->ib_node, &ib_nodev_conns);
692 spin_unlock_irqrestore(&ib_nodev_conns_lock, flags);
693
694
695 rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
696 return 0;
697}
698
Andy Grover745cbcc2009-04-01 08:20:19 +0000699/*
700 * Free a connection. Connection must be shut down and not set for reconnect.
701 */
Andy Groverec162272009-02-24 15:30:30 +0000702void rds_ib_conn_free(void *arg)
703{
704 struct rds_ib_connection *ic = arg;
Andy Grover745cbcc2009-04-01 08:20:19 +0000705 spinlock_t *lock_ptr;
706
Andy Groverec162272009-02-24 15:30:30 +0000707 rdsdebug("ic %p\n", ic);
Andy Grover745cbcc2009-04-01 08:20:19 +0000708
709 /*
710 * Conn is either on a dev's list or on the nodev list.
711 * A race with shutdown() or connect() would cause problems
712 * (since rds_ibdev would change) but that should never happen.
713 */
714 lock_ptr = ic->rds_ibdev ? &ic->rds_ibdev->spinlock : &ib_nodev_conns_lock;
715
716 spin_lock_irq(lock_ptr);
Andy Groverec162272009-02-24 15:30:30 +0000717 list_del(&ic->ib_node);
Andy Grover745cbcc2009-04-01 08:20:19 +0000718 spin_unlock_irq(lock_ptr);
719
Andy Groverec162272009-02-24 15:30:30 +0000720 kfree(ic);
721}
722
723
724/*
725 * An error occurred on the connection
726 */
727void
728__rds_ib_conn_error(struct rds_connection *conn, const char *fmt, ...)
729{
730 va_list ap;
731
732 rds_conn_drop(conn);
733
734 va_start(ap, fmt);
735 vprintk(fmt, ap);
736 va_end(ap);
737}