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fcd8b7c0 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> | |
5a0e3ad6 | 35 | #include <linux/slab.h> |
fcd8b7c0 AG |
36 | #include <linux/vmalloc.h> |
37 | ||
38 | #include "rds.h" | |
39 | #include "iw.h" | |
40 | ||
41 | /* | |
42 | * Set the selected protocol version | |
43 | */ | |
44 | static void rds_iw_set_protocol(struct rds_connection *conn, unsigned int version) | |
45 | { | |
46 | conn->c_version = version; | |
47 | } | |
48 | ||
49 | /* | |
50 | * Set up flow control | |
51 | */ | |
52 | static void rds_iw_set_flow_control(struct rds_connection *conn, u32 credits) | |
53 | { | |
54 | struct rds_iw_connection *ic = conn->c_transport_data; | |
55 | ||
56 | if (rds_iw_sysctl_flow_control && credits != 0) { | |
57 | /* We're doing flow control */ | |
58 | ic->i_flowctl = 1; | |
59 | rds_iw_send_add_credits(conn, credits); | |
60 | } else { | |
61 | ic->i_flowctl = 0; | |
62 | } | |
63 | } | |
64 | ||
65 | /* | |
66 | * Connection established. | |
67 | * We get here for both outgoing and incoming connection. | |
68 | */ | |
69 | void rds_iw_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event) | |
70 | { | |
71 | const struct rds_iw_connect_private *dp = NULL; | |
72 | struct rds_iw_connection *ic = conn->c_transport_data; | |
73 | struct rds_iw_device *rds_iwdev; | |
74 | int err; | |
75 | ||
76 | if (event->param.conn.private_data_len) { | |
77 | dp = event->param.conn.private_data; | |
78 | ||
79 | rds_iw_set_protocol(conn, | |
80 | RDS_PROTOCOL(dp->dp_protocol_major, | |
81 | dp->dp_protocol_minor)); | |
82 | rds_iw_set_flow_control(conn, be32_to_cpu(dp->dp_credit)); | |
83 | } | |
84 | ||
85 | /* update ib_device with this local ipaddr & conn */ | |
86 | rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client); | |
87 | err = rds_iw_update_cm_id(rds_iwdev, ic->i_cm_id); | |
88 | if (err) | |
89 | printk(KERN_ERR "rds_iw_update_ipaddr failed (%d)\n", err); | |
745cbcca | 90 | rds_iw_add_conn(rds_iwdev, conn); |
fcd8b7c0 AG |
91 | |
92 | /* If the peer gave us the last packet it saw, process this as if | |
93 | * we had received a regular ACK. */ | |
94 | if (dp && dp->dp_ack_seq) | |
95 | rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL); | |
96 | ||
97 | printk(KERN_NOTICE "RDS/IW: connected to %pI4<->%pI4 version %u.%u%s\n", | |
98 | &conn->c_laddr, &conn->c_faddr, | |
99 | RDS_PROTOCOL_MAJOR(conn->c_version), | |
100 | RDS_PROTOCOL_MINOR(conn->c_version), | |
101 | ic->i_flowctl ? ", flow control" : ""); | |
102 | ||
103 | rds_connect_complete(conn); | |
104 | } | |
105 | ||
106 | static void rds_iw_cm_fill_conn_param(struct rds_connection *conn, | |
107 | struct rdma_conn_param *conn_param, | |
108 | struct rds_iw_connect_private *dp, | |
109 | u32 protocol_version) | |
110 | { | |
111 | struct rds_iw_connection *ic = conn->c_transport_data; | |
112 | ||
113 | memset(conn_param, 0, sizeof(struct rdma_conn_param)); | |
114 | /* XXX tune these? */ | |
115 | conn_param->responder_resources = 1; | |
116 | conn_param->initiator_depth = 1; | |
117 | ||
118 | if (dp) { | |
119 | memset(dp, 0, sizeof(*dp)); | |
120 | dp->dp_saddr = conn->c_laddr; | |
121 | dp->dp_daddr = conn->c_faddr; | |
122 | dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version); | |
123 | dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version); | |
124 | dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IW_SUPPORTED_PROTOCOLS); | |
125 | dp->dp_ack_seq = rds_iw_piggyb_ack(ic); | |
126 | ||
127 | /* Advertise flow control */ | |
128 | if (ic->i_flowctl) { | |
129 | unsigned int credits; | |
130 | ||
131 | credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits)); | |
132 | dp->dp_credit = cpu_to_be32(credits); | |
133 | atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits); | |
134 | } | |
135 | ||
136 | conn_param->private_data = dp; | |
137 | conn_param->private_data_len = sizeof(*dp); | |
138 | } | |
139 | } | |
140 | ||
141 | static void rds_iw_cq_event_handler(struct ib_event *event, void *data) | |
142 | { | |
143 | rdsdebug("event %u data %p\n", event->event, data); | |
144 | } | |
145 | ||
146 | static void rds_iw_qp_event_handler(struct ib_event *event, void *data) | |
147 | { | |
148 | struct rds_connection *conn = data; | |
149 | struct rds_iw_connection *ic = conn->c_transport_data; | |
150 | ||
151 | rdsdebug("conn %p ic %p event %u\n", conn, ic, event->event); | |
152 | ||
153 | switch (event->event) { | |
154 | case IB_EVENT_COMM_EST: | |
155 | rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST); | |
156 | break; | |
157 | case IB_EVENT_QP_REQ_ERR: | |
158 | case IB_EVENT_QP_FATAL: | |
159 | default: | |
97069788 AG |
160 | rdsdebug("Fatal QP Event %u " |
161 | "- connection %pI4->%pI4, reconnecting\n", | |
fcd8b7c0 AG |
162 | event->event, &conn->c_laddr, |
163 | &conn->c_faddr); | |
97069788 | 164 | rds_conn_drop(conn); |
fcd8b7c0 AG |
165 | break; |
166 | } | |
167 | } | |
168 | ||
169 | /* | |
170 | * Create a QP | |
171 | */ | |
172 | static int rds_iw_init_qp_attrs(struct ib_qp_init_attr *attr, | |
173 | struct rds_iw_device *rds_iwdev, | |
174 | struct rds_iw_work_ring *send_ring, | |
175 | void (*send_cq_handler)(struct ib_cq *, void *), | |
176 | struct rds_iw_work_ring *recv_ring, | |
177 | void (*recv_cq_handler)(struct ib_cq *, void *), | |
178 | void *context) | |
179 | { | |
180 | struct ib_device *dev = rds_iwdev->dev; | |
181 | unsigned int send_size, recv_size; | |
182 | int ret; | |
183 | ||
184 | /* The offset of 1 is to accomodate the additional ACK WR. */ | |
185 | send_size = min_t(unsigned int, rds_iwdev->max_wrs, rds_iw_sysctl_max_send_wr + 1); | |
186 | recv_size = min_t(unsigned int, rds_iwdev->max_wrs, rds_iw_sysctl_max_recv_wr + 1); | |
187 | rds_iw_ring_resize(send_ring, send_size - 1); | |
188 | rds_iw_ring_resize(recv_ring, recv_size - 1); | |
189 | ||
190 | memset(attr, 0, sizeof(*attr)); | |
191 | attr->event_handler = rds_iw_qp_event_handler; | |
192 | attr->qp_context = context; | |
193 | attr->cap.max_send_wr = send_size; | |
194 | attr->cap.max_recv_wr = recv_size; | |
195 | attr->cap.max_send_sge = rds_iwdev->max_sge; | |
196 | attr->cap.max_recv_sge = RDS_IW_RECV_SGE; | |
197 | attr->sq_sig_type = IB_SIGNAL_REQ_WR; | |
198 | attr->qp_type = IB_QPT_RC; | |
199 | ||
200 | attr->send_cq = ib_create_cq(dev, send_cq_handler, | |
201 | rds_iw_cq_event_handler, | |
202 | context, send_size, 0); | |
203 | if (IS_ERR(attr->send_cq)) { | |
204 | ret = PTR_ERR(attr->send_cq); | |
205 | attr->send_cq = NULL; | |
206 | rdsdebug("ib_create_cq send failed: %d\n", ret); | |
207 | goto out; | |
208 | } | |
209 | ||
210 | attr->recv_cq = ib_create_cq(dev, recv_cq_handler, | |
211 | rds_iw_cq_event_handler, | |
212 | context, recv_size, 0); | |
213 | if (IS_ERR(attr->recv_cq)) { | |
214 | ret = PTR_ERR(attr->recv_cq); | |
215 | attr->recv_cq = NULL; | |
216 | rdsdebug("ib_create_cq send failed: %d\n", ret); | |
217 | goto out; | |
218 | } | |
219 | ||
220 | ret = ib_req_notify_cq(attr->send_cq, IB_CQ_NEXT_COMP); | |
221 | if (ret) { | |
222 | rdsdebug("ib_req_notify_cq send failed: %d\n", ret); | |
223 | goto out; | |
224 | } | |
225 | ||
226 | ret = ib_req_notify_cq(attr->recv_cq, IB_CQ_SOLICITED); | |
227 | if (ret) { | |
228 | rdsdebug("ib_req_notify_cq recv failed: %d\n", ret); | |
229 | goto out; | |
230 | } | |
231 | ||
232 | out: | |
233 | if (ret) { | |
234 | if (attr->send_cq) | |
235 | ib_destroy_cq(attr->send_cq); | |
236 | if (attr->recv_cq) | |
237 | ib_destroy_cq(attr->recv_cq); | |
238 | } | |
239 | return ret; | |
240 | } | |
241 | ||
242 | /* | |
243 | * This needs to be very careful to not leave IS_ERR pointers around for | |
244 | * cleanup to trip over. | |
245 | */ | |
246 | static int rds_iw_setup_qp(struct rds_connection *conn) | |
247 | { | |
248 | struct rds_iw_connection *ic = conn->c_transport_data; | |
249 | struct ib_device *dev = ic->i_cm_id->device; | |
250 | struct ib_qp_init_attr attr; | |
251 | struct rds_iw_device *rds_iwdev; | |
252 | int ret; | |
253 | ||
254 | /* rds_iw_add_one creates a rds_iw_device object per IB device, | |
255 | * and allocates a protection domain, memory range and MR pool | |
256 | * for each. If that fails for any reason, it will not register | |
257 | * the rds_iwdev at all. | |
258 | */ | |
259 | rds_iwdev = ib_get_client_data(dev, &rds_iw_client); | |
8690bfa1 | 260 | if (!rds_iwdev) { |
fcd8b7c0 AG |
261 | if (printk_ratelimit()) |
262 | printk(KERN_NOTICE "RDS/IW: No client_data for device %s\n", | |
263 | dev->name); | |
264 | return -EOPNOTSUPP; | |
265 | } | |
266 | ||
267 | /* Protection domain and memory range */ | |
268 | ic->i_pd = rds_iwdev->pd; | |
269 | ic->i_mr = rds_iwdev->mr; | |
270 | ||
271 | ret = rds_iw_init_qp_attrs(&attr, rds_iwdev, | |
272 | &ic->i_send_ring, rds_iw_send_cq_comp_handler, | |
273 | &ic->i_recv_ring, rds_iw_recv_cq_comp_handler, | |
274 | conn); | |
275 | if (ret < 0) | |
276 | goto out; | |
277 | ||
278 | ic->i_send_cq = attr.send_cq; | |
279 | ic->i_recv_cq = attr.recv_cq; | |
280 | ||
281 | /* | |
282 | * XXX this can fail if max_*_wr is too large? Are we supposed | |
283 | * to back off until we get a value that the hardware can support? | |
284 | */ | |
285 | ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr); | |
286 | if (ret) { | |
287 | rdsdebug("rdma_create_qp failed: %d\n", ret); | |
288 | goto out; | |
289 | } | |
290 | ||
291 | ic->i_send_hdrs = ib_dma_alloc_coherent(dev, | |
292 | ic->i_send_ring.w_nr * | |
293 | sizeof(struct rds_header), | |
294 | &ic->i_send_hdrs_dma, GFP_KERNEL); | |
8690bfa1 | 295 | if (!ic->i_send_hdrs) { |
fcd8b7c0 AG |
296 | ret = -ENOMEM; |
297 | rdsdebug("ib_dma_alloc_coherent send failed\n"); | |
298 | goto out; | |
299 | } | |
300 | ||
301 | ic->i_recv_hdrs = ib_dma_alloc_coherent(dev, | |
302 | ic->i_recv_ring.w_nr * | |
303 | sizeof(struct rds_header), | |
304 | &ic->i_recv_hdrs_dma, GFP_KERNEL); | |
8690bfa1 | 305 | if (!ic->i_recv_hdrs) { |
fcd8b7c0 AG |
306 | ret = -ENOMEM; |
307 | rdsdebug("ib_dma_alloc_coherent recv failed\n"); | |
308 | goto out; | |
309 | } | |
310 | ||
311 | ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header), | |
312 | &ic->i_ack_dma, GFP_KERNEL); | |
8690bfa1 | 313 | if (!ic->i_ack) { |
fcd8b7c0 AG |
314 | ret = -ENOMEM; |
315 | rdsdebug("ib_dma_alloc_coherent ack failed\n"); | |
316 | goto out; | |
317 | } | |
318 | ||
319 | ic->i_sends = vmalloc(ic->i_send_ring.w_nr * sizeof(struct rds_iw_send_work)); | |
8690bfa1 | 320 | if (!ic->i_sends) { |
fcd8b7c0 AG |
321 | ret = -ENOMEM; |
322 | rdsdebug("send allocation failed\n"); | |
323 | goto out; | |
324 | } | |
325 | rds_iw_send_init_ring(ic); | |
326 | ||
327 | ic->i_recvs = vmalloc(ic->i_recv_ring.w_nr * sizeof(struct rds_iw_recv_work)); | |
8690bfa1 | 328 | if (!ic->i_recvs) { |
fcd8b7c0 AG |
329 | ret = -ENOMEM; |
330 | rdsdebug("recv allocation failed\n"); | |
331 | goto out; | |
332 | } | |
333 | ||
334 | rds_iw_recv_init_ring(ic); | |
335 | rds_iw_recv_init_ack(ic); | |
336 | ||
337 | /* Post receive buffers - as a side effect, this will update | |
338 | * the posted credit count. */ | |
339 | rds_iw_recv_refill(conn, GFP_KERNEL, GFP_HIGHUSER, 1); | |
340 | ||
341 | rdsdebug("conn %p pd %p mr %p cq %p %p\n", conn, ic->i_pd, ic->i_mr, | |
342 | ic->i_send_cq, ic->i_recv_cq); | |
343 | ||
344 | out: | |
345 | return ret; | |
346 | } | |
347 | ||
348 | static u32 rds_iw_protocol_compatible(const struct rds_iw_connect_private *dp) | |
349 | { | |
350 | u16 common; | |
351 | u32 version = 0; | |
352 | ||
353 | /* rdma_cm private data is odd - when there is any private data in the | |
354 | * request, we will be given a pretty large buffer without telling us the | |
355 | * original size. The only way to tell the difference is by looking at | |
356 | * the contents, which are initialized to zero. | |
357 | * If the protocol version fields aren't set, this is a connection attempt | |
358 | * from an older version. This could could be 3.0 or 2.0 - we can't tell. | |
359 | * We really should have changed this for OFED 1.3 :-( */ | |
360 | if (dp->dp_protocol_major == 0) | |
361 | return RDS_PROTOCOL_3_0; | |
362 | ||
363 | common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IW_SUPPORTED_PROTOCOLS; | |
364 | if (dp->dp_protocol_major == 3 && common) { | |
365 | version = RDS_PROTOCOL_3_0; | |
366 | while ((common >>= 1) != 0) | |
367 | version++; | |
368 | } else if (printk_ratelimit()) { | |
369 | printk(KERN_NOTICE "RDS: Connection from %pI4 using " | |
370 | "incompatible protocol version %u.%u\n", | |
371 | &dp->dp_saddr, | |
372 | dp->dp_protocol_major, | |
373 | dp->dp_protocol_minor); | |
374 | } | |
375 | return version; | |
376 | } | |
377 | ||
378 | int rds_iw_cm_handle_connect(struct rdma_cm_id *cm_id, | |
379 | struct rdma_cm_event *event) | |
380 | { | |
381 | const struct rds_iw_connect_private *dp = event->param.conn.private_data; | |
382 | struct rds_iw_connect_private dp_rep; | |
383 | struct rds_connection *conn = NULL; | |
384 | struct rds_iw_connection *ic = NULL; | |
385 | struct rdma_conn_param conn_param; | |
386 | struct rds_iw_device *rds_iwdev; | |
387 | u32 version; | |
388 | int err, destroy = 1; | |
389 | ||
390 | /* Check whether the remote protocol version matches ours. */ | |
391 | version = rds_iw_protocol_compatible(dp); | |
392 | if (!version) | |
393 | goto out; | |
394 | ||
395 | rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u\n", | |
396 | &dp->dp_saddr, &dp->dp_daddr, | |
397 | RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version)); | |
398 | ||
399 | conn = rds_conn_create(dp->dp_daddr, dp->dp_saddr, &rds_iw_transport, | |
400 | GFP_KERNEL); | |
401 | if (IS_ERR(conn)) { | |
402 | rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn)); | |
403 | conn = NULL; | |
404 | goto out; | |
405 | } | |
406 | ||
407 | /* | |
408 | * The connection request may occur while the | |
409 | * previous connection exist, e.g. in case of failover. | |
410 | * But as connections may be initiated simultaneously | |
411 | * by both hosts, we have a random backoff mechanism - | |
412 | * see the comment above rds_queue_reconnect() | |
413 | */ | |
414 | mutex_lock(&conn->c_cm_lock); | |
415 | if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) { | |
416 | if (rds_conn_state(conn) == RDS_CONN_UP) { | |
417 | rdsdebug("incoming connect while connecting\n"); | |
418 | rds_conn_drop(conn); | |
419 | rds_iw_stats_inc(s_iw_listen_closed_stale); | |
420 | } else | |
421 | if (rds_conn_state(conn) == RDS_CONN_CONNECTING) { | |
422 | /* Wait and see - our connect may still be succeeding */ | |
423 | rds_iw_stats_inc(s_iw_connect_raced); | |
424 | } | |
425 | mutex_unlock(&conn->c_cm_lock); | |
426 | goto out; | |
427 | } | |
428 | ||
429 | ic = conn->c_transport_data; | |
430 | ||
431 | rds_iw_set_protocol(conn, version); | |
432 | rds_iw_set_flow_control(conn, be32_to_cpu(dp->dp_credit)); | |
433 | ||
434 | /* If the peer gave us the last packet it saw, process this as if | |
435 | * we had received a regular ACK. */ | |
436 | if (dp->dp_ack_seq) | |
437 | rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL); | |
438 | ||
439 | BUG_ON(cm_id->context); | |
440 | BUG_ON(ic->i_cm_id); | |
441 | ||
442 | ic->i_cm_id = cm_id; | |
443 | cm_id->context = conn; | |
444 | ||
445 | rds_iwdev = ib_get_client_data(cm_id->device, &rds_iw_client); | |
446 | ic->i_dma_local_lkey = rds_iwdev->dma_local_lkey; | |
447 | ||
448 | /* We got halfway through setting up the ib_connection, if we | |
449 | * fail now, we have to take the long route out of this mess. */ | |
450 | destroy = 0; | |
451 | ||
452 | err = rds_iw_setup_qp(conn); | |
453 | if (err) { | |
454 | rds_iw_conn_error(conn, "rds_iw_setup_qp failed (%d)\n", err); | |
5daf47bb | 455 | mutex_unlock(&conn->c_cm_lock); |
fcd8b7c0 AG |
456 | goto out; |
457 | } | |
458 | ||
459 | rds_iw_cm_fill_conn_param(conn, &conn_param, &dp_rep, version); | |
460 | ||
461 | /* rdma_accept() calls rdma_reject() internally if it fails */ | |
462 | err = rdma_accept(cm_id, &conn_param); | |
463 | mutex_unlock(&conn->c_cm_lock); | |
464 | if (err) { | |
465 | rds_iw_conn_error(conn, "rdma_accept failed (%d)\n", err); | |
466 | goto out; | |
467 | } | |
468 | ||
469 | return 0; | |
470 | ||
471 | out: | |
472 | rdma_reject(cm_id, NULL, 0); | |
473 | return destroy; | |
474 | } | |
475 | ||
476 | ||
477 | int rds_iw_cm_initiate_connect(struct rdma_cm_id *cm_id) | |
478 | { | |
479 | struct rds_connection *conn = cm_id->context; | |
480 | struct rds_iw_connection *ic = conn->c_transport_data; | |
481 | struct rdma_conn_param conn_param; | |
482 | struct rds_iw_connect_private dp; | |
483 | int ret; | |
484 | ||
485 | /* If the peer doesn't do protocol negotiation, we must | |
486 | * default to RDSv3.0 */ | |
487 | rds_iw_set_protocol(conn, RDS_PROTOCOL_3_0); | |
488 | ic->i_flowctl = rds_iw_sysctl_flow_control; /* advertise flow control */ | |
489 | ||
490 | ret = rds_iw_setup_qp(conn); | |
491 | if (ret) { | |
492 | rds_iw_conn_error(conn, "rds_iw_setup_qp failed (%d)\n", ret); | |
493 | goto out; | |
494 | } | |
495 | ||
496 | rds_iw_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION); | |
497 | ||
498 | ret = rdma_connect(cm_id, &conn_param); | |
499 | if (ret) | |
500 | rds_iw_conn_error(conn, "rdma_connect failed (%d)\n", ret); | |
501 | ||
502 | out: | |
503 | /* Beware - returning non-zero tells the rdma_cm to destroy | |
504 | * the cm_id. We should certainly not do it as long as we still | |
505 | * "own" the cm_id. */ | |
506 | if (ret) { | |
507 | struct rds_iw_connection *ic = conn->c_transport_data; | |
508 | ||
509 | if (ic->i_cm_id == cm_id) | |
510 | ret = 0; | |
511 | } | |
512 | return ret; | |
513 | } | |
514 | ||
515 | int rds_iw_conn_connect(struct rds_connection *conn) | |
516 | { | |
517 | struct rds_iw_connection *ic = conn->c_transport_data; | |
518 | struct rds_iw_device *rds_iwdev; | |
519 | struct sockaddr_in src, dest; | |
520 | int ret; | |
521 | ||
522 | /* XXX I wonder what affect the port space has */ | |
523 | /* delegate cm event handler to rdma_transport */ | |
524 | ic->i_cm_id = rdma_create_id(rds_rdma_cm_event_handler, conn, | |
525 | RDMA_PS_TCP); | |
526 | if (IS_ERR(ic->i_cm_id)) { | |
527 | ret = PTR_ERR(ic->i_cm_id); | |
528 | ic->i_cm_id = NULL; | |
529 | rdsdebug("rdma_create_id() failed: %d\n", ret); | |
530 | goto out; | |
531 | } | |
532 | ||
533 | rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn); | |
534 | ||
535 | src.sin_family = AF_INET; | |
536 | src.sin_addr.s_addr = (__force u32)conn->c_laddr; | |
537 | src.sin_port = (__force u16)htons(0); | |
538 | ||
539 | /* First, bind to the local address and device. */ | |
540 | ret = rdma_bind_addr(ic->i_cm_id, (struct sockaddr *) &src); | |
541 | if (ret) { | |
542 | rdsdebug("rdma_bind_addr(%pI4) failed: %d\n", | |
543 | &conn->c_laddr, ret); | |
544 | rdma_destroy_id(ic->i_cm_id); | |
545 | ic->i_cm_id = NULL; | |
546 | goto out; | |
547 | } | |
548 | ||
549 | rds_iwdev = ib_get_client_data(ic->i_cm_id->device, &rds_iw_client); | |
550 | ic->i_dma_local_lkey = rds_iwdev->dma_local_lkey; | |
551 | ||
552 | dest.sin_family = AF_INET; | |
553 | dest.sin_addr.s_addr = (__force u32)conn->c_faddr; | |
554 | dest.sin_port = (__force u16)htons(RDS_PORT); | |
555 | ||
556 | ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src, | |
557 | (struct sockaddr *)&dest, | |
558 | RDS_RDMA_RESOLVE_TIMEOUT_MS); | |
559 | if (ret) { | |
560 | rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id, | |
561 | ret); | |
562 | rdma_destroy_id(ic->i_cm_id); | |
563 | ic->i_cm_id = NULL; | |
564 | } | |
565 | ||
566 | out: | |
567 | return ret; | |
568 | } | |
569 | ||
570 | /* | |
571 | * This is so careful about only cleaning up resources that were built up | |
572 | * so that it can be called at any point during startup. In fact it | |
573 | * can be called multiple times for a given connection. | |
574 | */ | |
575 | void rds_iw_conn_shutdown(struct rds_connection *conn) | |
576 | { | |
577 | struct rds_iw_connection *ic = conn->c_transport_data; | |
578 | int err = 0; | |
579 | struct ib_qp_attr qp_attr; | |
580 | ||
581 | rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id, | |
582 | ic->i_pd, ic->i_send_cq, ic->i_recv_cq, | |
583 | ic->i_cm_id ? ic->i_cm_id->qp : NULL); | |
584 | ||
585 | if (ic->i_cm_id) { | |
586 | struct ib_device *dev = ic->i_cm_id->device; | |
587 | ||
588 | rdsdebug("disconnecting cm %p\n", ic->i_cm_id); | |
589 | err = rdma_disconnect(ic->i_cm_id); | |
590 | if (err) { | |
591 | /* Actually this may happen quite frequently, when | |
592 | * an outgoing connect raced with an incoming connect. | |
593 | */ | |
594 | rdsdebug("rds_iw_conn_shutdown: failed to disconnect," | |
595 | " cm: %p err %d\n", ic->i_cm_id, err); | |
596 | } | |
597 | ||
598 | if (ic->i_cm_id->qp) { | |
599 | qp_attr.qp_state = IB_QPS_ERR; | |
600 | ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE); | |
601 | } | |
602 | ||
603 | wait_event(rds_iw_ring_empty_wait, | |
604 | rds_iw_ring_empty(&ic->i_send_ring) && | |
605 | rds_iw_ring_empty(&ic->i_recv_ring)); | |
606 | ||
607 | if (ic->i_send_hdrs) | |
608 | ib_dma_free_coherent(dev, | |
609 | ic->i_send_ring.w_nr * | |
610 | sizeof(struct rds_header), | |
611 | ic->i_send_hdrs, | |
612 | ic->i_send_hdrs_dma); | |
613 | ||
614 | if (ic->i_recv_hdrs) | |
615 | ib_dma_free_coherent(dev, | |
616 | ic->i_recv_ring.w_nr * | |
617 | sizeof(struct rds_header), | |
618 | ic->i_recv_hdrs, | |
619 | ic->i_recv_hdrs_dma); | |
620 | ||
621 | if (ic->i_ack) | |
622 | ib_dma_free_coherent(dev, sizeof(struct rds_header), | |
623 | ic->i_ack, ic->i_ack_dma); | |
624 | ||
625 | if (ic->i_sends) | |
626 | rds_iw_send_clear_ring(ic); | |
627 | if (ic->i_recvs) | |
628 | rds_iw_recv_clear_ring(ic); | |
629 | ||
630 | if (ic->i_cm_id->qp) | |
631 | rdma_destroy_qp(ic->i_cm_id); | |
632 | if (ic->i_send_cq) | |
633 | ib_destroy_cq(ic->i_send_cq); | |
634 | if (ic->i_recv_cq) | |
635 | ib_destroy_cq(ic->i_recv_cq); | |
636 | ||
637 | /* | |
638 | * If associated with an rds_iw_device: | |
639 | * Move connection back to the nodev list. | |
640 | * Remove cm_id from the device cm_id list. | |
641 | */ | |
745cbcca AG |
642 | if (ic->rds_iwdev) |
643 | rds_iw_remove_conn(ic->rds_iwdev, conn); | |
fcd8b7c0 AG |
644 | |
645 | rdma_destroy_id(ic->i_cm_id); | |
646 | ||
647 | ic->i_cm_id = NULL; | |
648 | ic->i_pd = NULL; | |
649 | ic->i_mr = NULL; | |
650 | ic->i_send_cq = NULL; | |
651 | ic->i_recv_cq = NULL; | |
652 | ic->i_send_hdrs = NULL; | |
653 | ic->i_recv_hdrs = NULL; | |
654 | ic->i_ack = NULL; | |
655 | } | |
656 | BUG_ON(ic->rds_iwdev); | |
657 | ||
658 | /* Clear pending transmit */ | |
659 | if (ic->i_rm) { | |
660 | rds_message_put(ic->i_rm); | |
661 | ic->i_rm = NULL; | |
662 | } | |
663 | ||
664 | /* Clear the ACK state */ | |
665 | clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags); | |
8cbd9606 AG |
666 | #ifdef KERNEL_HAS_ATOMIC64 |
667 | atomic64_set(&ic->i_ack_next, 0); | |
668 | #else | |
669 | ic->i_ack_next = 0; | |
670 | #endif | |
fcd8b7c0 AG |
671 | ic->i_ack_recv = 0; |
672 | ||
673 | /* Clear flow control state */ | |
674 | ic->i_flowctl = 0; | |
675 | atomic_set(&ic->i_credits, 0); | |
676 | ||
677 | rds_iw_ring_init(&ic->i_send_ring, rds_iw_sysctl_max_send_wr); | |
678 | rds_iw_ring_init(&ic->i_recv_ring, rds_iw_sysctl_max_recv_wr); | |
679 | ||
680 | if (ic->i_iwinc) { | |
681 | rds_inc_put(&ic->i_iwinc->ii_inc); | |
682 | ic->i_iwinc = NULL; | |
683 | } | |
684 | ||
685 | vfree(ic->i_sends); | |
686 | ic->i_sends = NULL; | |
687 | vfree(ic->i_recvs); | |
688 | ic->i_recvs = NULL; | |
689 | rdsdebug("shutdown complete\n"); | |
690 | } | |
691 | ||
692 | int rds_iw_conn_alloc(struct rds_connection *conn, gfp_t gfp) | |
693 | { | |
694 | struct rds_iw_connection *ic; | |
695 | unsigned long flags; | |
696 | ||
697 | /* XXX too lazy? */ | |
698 | ic = kzalloc(sizeof(struct rds_iw_connection), GFP_KERNEL); | |
8690bfa1 | 699 | if (!ic) |
fcd8b7c0 AG |
700 | return -ENOMEM; |
701 | ||
702 | INIT_LIST_HEAD(&ic->iw_node); | |
d521b63b AG |
703 | tasklet_init(&ic->i_recv_tasklet, rds_iw_recv_tasklet_fn, |
704 | (unsigned long) ic); | |
fcd8b7c0 | 705 | mutex_init(&ic->i_recv_mutex); |
8cbd9606 AG |
706 | #ifndef KERNEL_HAS_ATOMIC64 |
707 | spin_lock_init(&ic->i_ack_lock); | |
708 | #endif | |
fcd8b7c0 AG |
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 | ||
745cbcca AG |
729 | /* |
730 | * Free a connection. Connection must be shut down and not set for reconnect. | |
731 | */ | |
fcd8b7c0 AG |
732 | void rds_iw_conn_free(void *arg) |
733 | { | |
734 | struct rds_iw_connection *ic = arg; | |
745cbcca AG |
735 | spinlock_t *lock_ptr; |
736 | ||
fcd8b7c0 | 737 | rdsdebug("ic %p\n", ic); |
745cbcca AG |
738 | |
739 | /* | |
740 | * Conn is either on a dev's list or on the nodev list. | |
741 | * A race with shutdown() or connect() would cause problems | |
742 | * (since rds_iwdev would change) but that should never happen. | |
743 | */ | |
744 | lock_ptr = ic->rds_iwdev ? &ic->rds_iwdev->spinlock : &iw_nodev_conns_lock; | |
745 | ||
746 | spin_lock_irq(lock_ptr); | |
fcd8b7c0 | 747 | list_del(&ic->iw_node); |
745cbcca AG |
748 | spin_unlock_irq(lock_ptr); |
749 | ||
fcd8b7c0 AG |
750 | kfree(ic); |
751 | } | |
752 | ||
753 | /* | |
754 | * An error occurred on the connection | |
755 | */ | |
756 | void | |
757 | __rds_iw_conn_error(struct rds_connection *conn, const char *fmt, ...) | |
758 | { | |
759 | va_list ap; | |
760 | ||
761 | rds_conn_drop(conn); | |
762 | ||
763 | va_start(ap, fmt); | |
764 | vprintk(fmt, ap); | |
765 | va_end(ap); | |
766 | } |