Commit | Line | Data |
---|---|---|
ec16227e AG |
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 "ib.h" | |
39 | ||
40 | /* | |
41 | * Set the selected protocol version | |
42 | */ | |
43 | static 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 | */ | |
51 | static 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 | */ | |
78 | static void | |
79 | rds_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 | */ | |
93 | void 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); | |
745cbcca | 129 | rds_ib_add_conn(rds_ibdev, conn); |
ec16227e AG |
130 | |
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 | ||
139 | static 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 | ||
176 | static 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 | ||
181 | static 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 | */ | |
204 | static 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 | ||
343 | out: | |
344 | return ret; | |
345 | } | |
346 | ||
347 | static 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 | ||
377 | int 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 | ||
469 | out: | |
470 | rdma_reject(cm_id, NULL, 0); | |
471 | return destroy; | |
472 | } | |
473 | ||
474 | ||
475 | int 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 | ||
500 | out: | |
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 | ||
511 | int 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 | ||
548 | out: | |
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 | */ | |
557 | void 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 | */ | |
745cbcca AG |
617 | if (ic->rds_ibdev) |
618 | rds_ib_remove_conn(ic->rds_ibdev, conn); | |
ec16227e AG |
619 | |
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); | |
8cbd9606 AG |
639 | #ifdef KERNEL_HAS_ATOMIC64 |
640 | atomic64_set(&ic->i_ack_next, 0); | |
641 | #else | |
642 | ic->i_ack_next = 0; | |
643 | #endif | |
ec16227e AG |
644 | 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 | ||
664 | int 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); | |
8cbd9606 AG |
676 | #ifndef KERNEL_HAS_ATOMIC64 |
677 | spin_lock_init(&ic->i_ack_lock); | |
678 | #endif | |
ec16227e AG |
679 | |
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 | ||
745cbcca AG |
699 | /* |
700 | * Free a connection. Connection must be shut down and not set for reconnect. | |
701 | */ | |
ec16227e AG |
702 | void rds_ib_conn_free(void *arg) |
703 | { | |
704 | struct rds_ib_connection *ic = arg; | |
745cbcca AG |
705 | spinlock_t *lock_ptr; |
706 | ||
ec16227e | 707 | rdsdebug("ic %p\n", ic); |
745cbcca AG |
708 | |
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); | |
ec16227e | 717 | list_del(&ic->ib_node); |
745cbcca AG |
718 | spin_unlock_irq(lock_ptr); |
719 | ||
ec16227e AG |
720 | kfree(ic); |
721 | } | |
722 | ||
723 | ||
724 | /* | |
725 | * An error occurred on the connection | |
726 | */ | |
727 | void | |
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 | } |