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-rw-r--r--net/rds/iw_cm.c750
1 files changed, 750 insertions, 0 deletions
diff --git a/net/rds/iw_cm.c b/net/rds/iw_cm.c
new file mode 100644
index 000000000000..57ecb3d4b8a5
--- /dev/null
+++ b/net/rds/iw_cm.c
@@ -0,0 +1,750 @@
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/vmalloc.h>
36
37#include "rds.h"
38#include "iw.h"
39
40/*
41 * Set the selected protocol version
42 */
43static void rds_iw_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_iw_set_flow_control(struct rds_connection *conn, u32 credits)
52{
53 struct rds_iw_connection *ic = conn->c_transport_data;
54
55 if (rds_iw_sysctl_flow_control && credits != 0) {
56 /* We're doing flow control */
57 ic->i_flowctl = 1;
58 rds_iw_send_add_credits(conn, credits);
59 } else {
60 ic->i_flowctl = 0;
61 }
62}
63
64/*
65 * Connection established.
66 * We get here for both outgoing and incoming connection.
67 */
68void rds_iw_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event)
69{
70 const struct rds_iw_connect_private *dp = NULL;
71 struct rds_iw_connection *ic = conn->c_transport_data;
72 struct rds_iw_device *rds_iwdev;
73 int err;
74
75 if (event->param.conn.private_data_len) {
76 dp = event->param.conn.private_data;
77
78 rds_iw_set_protocol(conn,
79 RDS_PROTOCOL(dp->dp_protocol_major,
80 dp->dp_protocol_minor));
81 rds_iw_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
82 }
83
84 /* update ib_device with this local ipaddr & conn */
85 rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
86 err = rds_iw_update_cm_id(rds_iwdev, ic->i_cm_id);
87 if (err)
88 printk(KERN_ERR "rds_iw_update_ipaddr failed (%d)\n", err);
89 err = rds_iw_add_conn(rds_iwdev, conn);
90 if (err)
91 printk(KERN_ERR "rds_iw_add_conn failed (%d)\n", err);
92
93 /* If the peer gave us the last packet it saw, process this as if
94 * we had received a regular ACK. */
95 if (dp && dp->dp_ack_seq)
96 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
97
98 printk(KERN_NOTICE "RDS/IW: connected to %pI4<->%pI4 version %u.%u%s\n",
99 &conn->c_laddr, &conn->c_faddr,
100 RDS_PROTOCOL_MAJOR(conn->c_version),
101 RDS_PROTOCOL_MINOR(conn->c_version),
102 ic->i_flowctl ? ", flow control" : "");
103
104 rds_connect_complete(conn);
105}
106
107static void rds_iw_cm_fill_conn_param(struct rds_connection *conn,
108 struct rdma_conn_param *conn_param,
109 struct rds_iw_connect_private *dp,
110 u32 protocol_version)
111{
112 struct rds_iw_connection *ic = conn->c_transport_data;
113
114 memset(conn_param, 0, sizeof(struct rdma_conn_param));
115 /* XXX tune these? */
116 conn_param->responder_resources = 1;
117 conn_param->initiator_depth = 1;
118
119 if (dp) {
120 memset(dp, 0, sizeof(*dp));
121 dp->dp_saddr = conn->c_laddr;
122 dp->dp_daddr = conn->c_faddr;
123 dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version);
124 dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version);
125 dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IW_SUPPORTED_PROTOCOLS);
126 dp->dp_ack_seq = rds_iw_piggyb_ack(ic);
127
128 /* Advertise flow control */
129 if (ic->i_flowctl) {
130 unsigned int credits;
131
132 credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits));
133 dp->dp_credit = cpu_to_be32(credits);
134 atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits);
135 }
136
137 conn_param->private_data = dp;
138 conn_param->private_data_len = sizeof(*dp);
139 }
140}
141
142static void rds_iw_cq_event_handler(struct ib_event *event, void *data)
143{
144 rdsdebug("event %u data %p\n", event->event, data);
145}
146
147static void rds_iw_qp_event_handler(struct ib_event *event, void *data)
148{
149 struct rds_connection *conn = data;
150 struct rds_iw_connection *ic = conn->c_transport_data;
151
152 rdsdebug("conn %p ic %p event %u\n", conn, ic, event->event);
153
154 switch (event->event) {
155 case IB_EVENT_COMM_EST:
156 rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST);
157 break;
158 case IB_EVENT_QP_REQ_ERR:
159 case IB_EVENT_QP_FATAL:
160 default:
161 rds_iw_conn_error(conn, "RDS/IW: Fatal QP Event %u - connection %pI4->%pI4...reconnecting\n",
162 event->event, &conn->c_laddr,
163 &conn->c_faddr);
164 break;
165 }
166}
167
168/*
169 * Create a QP
170 */
171static int rds_iw_init_qp_attrs(struct ib_qp_init_attr *attr,
172 struct rds_iw_device *rds_iwdev,
173 struct rds_iw_work_ring *send_ring,
174 void (*send_cq_handler)(struct ib_cq *, void *),
175 struct rds_iw_work_ring *recv_ring,
176 void (*recv_cq_handler)(struct ib_cq *, void *),
177 void *context)
178{
179 struct ib_device *dev = rds_iwdev->dev;
180 unsigned int send_size, recv_size;
181 int ret;
182
183 /* The offset of 1 is to accomodate the additional ACK WR. */
184 send_size = min_t(unsigned int, rds_iwdev->max_wrs, rds_iw_sysctl_max_send_wr + 1);
185 recv_size = min_t(unsigned int, rds_iwdev->max_wrs, rds_iw_sysctl_max_recv_wr + 1);
186 rds_iw_ring_resize(send_ring, send_size - 1);
187 rds_iw_ring_resize(recv_ring, recv_size - 1);
188
189 memset(attr, 0, sizeof(*attr));
190 attr->event_handler = rds_iw_qp_event_handler;
191 attr->qp_context = context;
192 attr->cap.max_send_wr = send_size;
193 attr->cap.max_recv_wr = recv_size;
194 attr->cap.max_send_sge = rds_iwdev->max_sge;
195 attr->cap.max_recv_sge = RDS_IW_RECV_SGE;
196 attr->sq_sig_type = IB_SIGNAL_REQ_WR;
197 attr->qp_type = IB_QPT_RC;
198
199 attr->send_cq = ib_create_cq(dev, send_cq_handler,
200 rds_iw_cq_event_handler,
201 context, send_size, 0);
202 if (IS_ERR(attr->send_cq)) {
203 ret = PTR_ERR(attr->send_cq);
204 attr->send_cq = NULL;
205 rdsdebug("ib_create_cq send failed: %d\n", ret);
206 goto out;
207 }
208
209 attr->recv_cq = ib_create_cq(dev, recv_cq_handler,
210 rds_iw_cq_event_handler,
211 context, recv_size, 0);
212 if (IS_ERR(attr->recv_cq)) {
213 ret = PTR_ERR(attr->recv_cq);
214 attr->recv_cq = NULL;
215 rdsdebug("ib_create_cq send failed: %d\n", ret);
216 goto out;
217 }
218
219 ret = ib_req_notify_cq(attr->send_cq, IB_CQ_NEXT_COMP);
220 if (ret) {
221 rdsdebug("ib_req_notify_cq send failed: %d\n", ret);
222 goto out;
223 }
224
225 ret = ib_req_notify_cq(attr->recv_cq, IB_CQ_SOLICITED);
226 if (ret) {
227 rdsdebug("ib_req_notify_cq recv failed: %d\n", ret);
228 goto out;
229 }
230
231out:
232 if (ret) {
233 if (attr->send_cq)
234 ib_destroy_cq(attr->send_cq);
235 if (attr->recv_cq)
236 ib_destroy_cq(attr->recv_cq);
237 }
238 return ret;
239}
240
241/*
242 * This needs to be very careful to not leave IS_ERR pointers around for
243 * cleanup to trip over.
244 */
245static int rds_iw_setup_qp(struct rds_connection *conn)
246{
247 struct rds_iw_connection *ic = conn->c_transport_data;
248 struct ib_device *dev = ic->i_cm_id->device;
249 struct ib_qp_init_attr attr;
250 struct rds_iw_device *rds_iwdev;
251 int ret;
252
253 /* rds_iw_add_one creates a rds_iw_device object per IB device,
254 * and allocates a protection domain, memory range and MR pool
255 * for each. If that fails for any reason, it will not register
256 * the rds_iwdev at all.
257 */
258 rds_iwdev = ib_get_client_data(dev, &rds_iw_client);
259 if (rds_iwdev == NULL) {
260 if (printk_ratelimit())
261 printk(KERN_NOTICE "RDS/IW: No client_data for device %s\n",
262 dev->name);
263 return -EOPNOTSUPP;
264 }
265
266 /* Protection domain and memory range */
267 ic->i_pd = rds_iwdev->pd;
268 ic->i_mr = rds_iwdev->mr;
269
270 ret = rds_iw_init_qp_attrs(&attr, rds_iwdev,
271 &ic->i_send_ring, rds_iw_send_cq_comp_handler,
272 &ic->i_recv_ring, rds_iw_recv_cq_comp_handler,
273 conn);
274 if (ret < 0)
275 goto out;
276
277 ic->i_send_cq = attr.send_cq;
278 ic->i_recv_cq = attr.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_iw_send_work));
319 if (ic->i_sends == NULL) {
320 ret = -ENOMEM;
321 rdsdebug("send allocation failed\n");
322 goto out;
323 }
324 rds_iw_send_init_ring(ic);
325
326 ic->i_recvs = vmalloc(ic->i_recv_ring.w_nr * sizeof(struct rds_iw_recv_work));
327 if (ic->i_recvs == NULL) {
328 ret = -ENOMEM;
329 rdsdebug("recv allocation failed\n");
330 goto out;
331 }
332
333 rds_iw_recv_init_ring(ic);
334 rds_iw_recv_init_ack(ic);
335
336 /* Post receive buffers - as a side effect, this will update
337 * the posted credit count. */
338 rds_iw_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_iw_protocol_compatible(const struct rds_iw_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_IW_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_iw_cm_handle_connect(struct rdma_cm_id *cm_id,
378 struct rdma_cm_event *event)
379{
380 const struct rds_iw_connect_private *dp = event->param.conn.private_data;
381 struct rds_iw_connect_private dp_rep;
382 struct rds_connection *conn = NULL;
383 struct rds_iw_connection *ic = NULL;
384 struct rdma_conn_param conn_param;
385 struct rds_iw_device *rds_iwdev;
386 u32 version;
387 int err, destroy = 1;
388
389 /* Check whether the remote protocol version matches ours. */
390 version = rds_iw_protocol_compatible(dp);
391 if (!version)
392 goto out;
393
394 rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u\n",
395 &dp->dp_saddr, &dp->dp_daddr,
396 RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version));
397
398 conn = rds_conn_create(dp->dp_daddr, dp->dp_saddr, &rds_iw_transport,
399 GFP_KERNEL);
400 if (IS_ERR(conn)) {
401 rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn));
402 conn = NULL;
403 goto out;
404 }
405
406 /*
407 * The connection request may occur while the
408 * previous connection exist, e.g. in case of failover.
409 * But as connections may be initiated simultaneously
410 * by both hosts, we have a random backoff mechanism -
411 * see the comment above rds_queue_reconnect()
412 */
413 mutex_lock(&conn->c_cm_lock);
414 if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
415 if (rds_conn_state(conn) == RDS_CONN_UP) {
416 rdsdebug("incoming connect while connecting\n");
417 rds_conn_drop(conn);
418 rds_iw_stats_inc(s_iw_listen_closed_stale);
419 } else
420 if (rds_conn_state(conn) == RDS_CONN_CONNECTING) {
421 /* Wait and see - our connect may still be succeeding */
422 rds_iw_stats_inc(s_iw_connect_raced);
423 }
424 mutex_unlock(&conn->c_cm_lock);
425 goto out;
426 }
427
428 ic = conn->c_transport_data;
429
430 rds_iw_set_protocol(conn, version);
431 rds_iw_set_flow_control(conn, be32_to_cpu(dp->dp_credit));
432
433 /* If the peer gave us the last packet it saw, process this as if
434 * we had received a regular ACK. */
435 if (dp->dp_ack_seq)
436 rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL);
437
438 BUG_ON(cm_id->context);
439 BUG_ON(ic->i_cm_id);
440
441 ic->i_cm_id = cm_id;
442 cm_id->context = conn;
443
444 rds_iwdev = ib_get_client_data(cm_id->device, &rds_iw_client);
445 ic->i_dma_local_lkey = rds_iwdev->dma_local_lkey;
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_iw_setup_qp(conn);
452 if (err) {
453 rds_iw_conn_error(conn, "rds_iw_setup_qp failed (%d)\n", err);
454 goto out;
455 }
456
457 rds_iw_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_iw_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_iw_cm_initiate_connect(struct rdma_cm_id *cm_id)
476{
477 struct rds_connection *conn = cm_id->context;
478 struct rds_iw_connection *ic = conn->c_transport_data;
479 struct rdma_conn_param conn_param;
480 struct rds_iw_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_iw_set_protocol(conn, RDS_PROTOCOL_3_0);
486 ic->i_flowctl = rds_iw_sysctl_flow_control; /* advertise flow control */
487
488 ret = rds_iw_setup_qp(conn);
489 if (ret) {
490 rds_iw_conn_error(conn, "rds_iw_setup_qp failed (%d)\n", ret);
491 goto out;
492 }
493
494 rds_iw_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_iw_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 struct rds_iw_connection *ic = conn->c_transport_data;
506
507 if (ic->i_cm_id == cm_id)
508 ret = 0;
509 }
510 return ret;
511}
512
513int rds_iw_conn_connect(struct rds_connection *conn)
514{
515 struct rds_iw_connection *ic = conn->c_transport_data;
516 struct rds_iw_device *rds_iwdev;
517 struct sockaddr_in src, dest;
518 int ret;
519
520 /* XXX I wonder what affect the port space has */
521 /* delegate cm event handler to rdma_transport */
522 ic->i_cm_id = rdma_create_id(rds_rdma_cm_event_handler, conn,
523 RDMA_PS_TCP);
524 if (IS_ERR(ic->i_cm_id)) {
525 ret = PTR_ERR(ic->i_cm_id);
526 ic->i_cm_id = NULL;
527 rdsdebug("rdma_create_id() failed: %d\n", ret);
528 goto out;
529 }
530
531 rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn);
532
533 src.sin_family = AF_INET;
534 src.sin_addr.s_addr = (__force u32)conn->c_laddr;
535 src.sin_port = (__force u16)htons(0);
536
537 /* First, bind to the local address and device. */
538 ret = rdma_bind_addr(ic->i_cm_id, (struct sockaddr *) &src);
539 if (ret) {
540 rdsdebug("rdma_bind_addr(%pI4) failed: %d\n",
541 &conn->c_laddr, ret);
542 rdma_destroy_id(ic->i_cm_id);
543 ic->i_cm_id = NULL;
544 goto out;
545 }
546
547 rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client);
548 ic->i_dma_local_lkey = rds_iwdev->dma_local_lkey;
549
550 dest.sin_family = AF_INET;
551 dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
552 dest.sin_port = (__force u16)htons(RDS_PORT);
553
554 ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src,
555 (struct sockaddr *)&dest,
556 RDS_RDMA_RESOLVE_TIMEOUT_MS);
557 if (ret) {
558 rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id,
559 ret);
560 rdma_destroy_id(ic->i_cm_id);
561 ic->i_cm_id = NULL;
562 }
563
564out:
565 return ret;
566}
567
568/*
569 * This is so careful about only cleaning up resources that were built up
570 * so that it can be called at any point during startup. In fact it
571 * can be called multiple times for a given connection.
572 */
573void rds_iw_conn_shutdown(struct rds_connection *conn)
574{
575 struct rds_iw_connection *ic = conn->c_transport_data;
576 int err = 0;
577 struct ib_qp_attr qp_attr;
578
579 rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id,
580 ic->i_pd, ic->i_send_cq, ic->i_recv_cq,
581 ic->i_cm_id ? ic->i_cm_id->qp : NULL);
582
583 if (ic->i_cm_id) {
584 struct ib_device *dev = ic->i_cm_id->device;
585
586 rdsdebug("disconnecting cm %p\n", ic->i_cm_id);
587 err = rdma_disconnect(ic->i_cm_id);
588 if (err) {
589 /* Actually this may happen quite frequently, when
590 * an outgoing connect raced with an incoming connect.
591 */
592 rdsdebug("rds_iw_conn_shutdown: failed to disconnect,"
593 " cm: %p err %d\n", ic->i_cm_id, err);
594 }
595
596 if (ic->i_cm_id->qp) {
597 qp_attr.qp_state = IB_QPS_ERR;
598 ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE);
599 }
600
601 wait_event(rds_iw_ring_empty_wait,
602 rds_iw_ring_empty(&ic->i_send_ring) &&
603 rds_iw_ring_empty(&ic->i_recv_ring));
604
605 if (ic->i_send_hdrs)
606 ib_dma_free_coherent(dev,
607 ic->i_send_ring.w_nr *
608 sizeof(struct rds_header),
609 ic->i_send_hdrs,
610 ic->i_send_hdrs_dma);
611
612 if (ic->i_recv_hdrs)
613 ib_dma_free_coherent(dev,
614 ic->i_recv_ring.w_nr *
615 sizeof(struct rds_header),
616 ic->i_recv_hdrs,
617 ic->i_recv_hdrs_dma);
618
619 if (ic->i_ack)
620 ib_dma_free_coherent(dev, sizeof(struct rds_header),
621 ic->i_ack, ic->i_ack_dma);
622
623 if (ic->i_sends)
624 rds_iw_send_clear_ring(ic);
625 if (ic->i_recvs)
626 rds_iw_recv_clear_ring(ic);
627
628 if (ic->i_cm_id->qp)
629 rdma_destroy_qp(ic->i_cm_id);
630 if (ic->i_send_cq)
631 ib_destroy_cq(ic->i_send_cq);
632 if (ic->i_recv_cq)
633 ib_destroy_cq(ic->i_recv_cq);
634
635 /*
636 * If associated with an rds_iw_device:
637 * Move connection back to the nodev list.
638 * Remove cm_id from the device cm_id list.
639 */
640 if (ic->rds_iwdev) {
641
642 spin_lock_irq(&ic->rds_iwdev->spinlock);
643 BUG_ON(list_empty(&ic->iw_node));
644 list_del(&ic->iw_node);
645 spin_unlock_irq(&ic->rds_iwdev->spinlock);
646
647 spin_lock_irq(&iw_nodev_conns_lock);
648 list_add_tail(&ic->iw_node, &iw_nodev_conns);
649 spin_unlock_irq(&iw_nodev_conns_lock);
650 rds_iw_remove_cm_id(ic->rds_iwdev, ic->i_cm_id);
651 ic->rds_iwdev = NULL;
652 }
653
654 rdma_destroy_id(ic->i_cm_id);
655
656 ic->i_cm_id = NULL;
657 ic->i_pd = NULL;
658 ic->i_mr = NULL;
659 ic->i_send_cq = NULL;
660 ic->i_recv_cq = NULL;
661 ic->i_send_hdrs = NULL;
662 ic->i_recv_hdrs = NULL;
663 ic->i_ack = NULL;
664 }
665 BUG_ON(ic->rds_iwdev);
666
667 /* Clear pending transmit */
668 if (ic->i_rm) {
669 rds_message_put(ic->i_rm);
670 ic->i_rm = NULL;
671 }
672
673 /* Clear the ACK state */
674 clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags);
675 rds_iw_set_64bit(&ic->i_ack_next, 0);
676 ic->i_ack_recv = 0;
677
678 /* Clear flow control state */
679 ic->i_flowctl = 0;
680 atomic_set(&ic->i_credits, 0);
681
682 rds_iw_ring_init(&ic->i_send_ring, rds_iw_sysctl_max_send_wr);
683 rds_iw_ring_init(&ic->i_recv_ring, rds_iw_sysctl_max_recv_wr);
684
685 if (ic->i_iwinc) {
686 rds_inc_put(&ic->i_iwinc->ii_inc);
687 ic->i_iwinc = NULL;
688 }
689
690 vfree(ic->i_sends);
691 ic->i_sends = NULL;
692 vfree(ic->i_recvs);
693 ic->i_recvs = NULL;
694 rdsdebug("shutdown complete\n");
695}
696
697int rds_iw_conn_alloc(struct rds_connection *conn, gfp_t gfp)
698{
699 struct rds_iw_connection *ic;
700 unsigned long flags;
701
702 /* XXX too lazy? */
703 ic = kzalloc(sizeof(struct rds_iw_connection), GFP_KERNEL);
704 if (ic == NULL)
705 return -ENOMEM;
706
707 INIT_LIST_HEAD(&ic->iw_node);
708 mutex_init(&ic->i_recv_mutex);
709
710 /*
711 * rds_iw_conn_shutdown() waits for these to be emptied so they
712 * must be initialized before it can be called.
713 */
714 rds_iw_ring_init(&ic->i_send_ring, rds_iw_sysctl_max_send_wr);
715 rds_iw_ring_init(&ic->i_recv_ring, rds_iw_sysctl_max_recv_wr);
716
717 ic->conn = conn;
718 conn->c_transport_data = ic;
719
720 spin_lock_irqsave(&iw_nodev_conns_lock, flags);
721 list_add_tail(&ic->iw_node, &iw_nodev_conns);
722 spin_unlock_irqrestore(&iw_nodev_conns_lock, flags);
723
724
725 rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data);
726 return 0;
727}
728
729void rds_iw_conn_free(void *arg)
730{
731 struct rds_iw_connection *ic = arg;
732 rdsdebug("ic %p\n", ic);
733 list_del(&ic->iw_node);
734 kfree(ic);
735}
736
737/*
738 * An error occurred on the connection
739 */
740void
741__rds_iw_conn_error(struct rds_connection *conn, const char *fmt, ...)
742{
743 va_list ap;
744
745 rds_conn_drop(conn);
746
747 va_start(ap, fmt);
748 vprintk(fmt, ap);
749 va_end(ap);
750}
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-10 04:33:22 -0500