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> | |
5a0e3ad6 | 35 | #include <linux/slab.h> |
ec16227e AG |
36 | #include <linux/vmalloc.h> |
37 | ||
38 | #include "rds.h" | |
39 | #include "ib.h" | |
40 | ||
1bde04a6 | 41 | static char *rds_ib_event_type_strings[] = { |
59f740a6 ZB |
42 | #define RDS_IB_EVENT_STRING(foo) \ |
43 | [IB_EVENT_##foo] = __stringify(IB_EVENT_##foo) | |
1bde04a6 ZB |
44 | RDS_IB_EVENT_STRING(CQ_ERR), |
45 | RDS_IB_EVENT_STRING(QP_FATAL), | |
46 | RDS_IB_EVENT_STRING(QP_REQ_ERR), | |
47 | RDS_IB_EVENT_STRING(QP_ACCESS_ERR), | |
48 | RDS_IB_EVENT_STRING(COMM_EST), | |
49 | RDS_IB_EVENT_STRING(SQ_DRAINED), | |
50 | RDS_IB_EVENT_STRING(PATH_MIG), | |
51 | RDS_IB_EVENT_STRING(PATH_MIG_ERR), | |
52 | RDS_IB_EVENT_STRING(DEVICE_FATAL), | |
53 | RDS_IB_EVENT_STRING(PORT_ACTIVE), | |
54 | RDS_IB_EVENT_STRING(PORT_ERR), | |
55 | RDS_IB_EVENT_STRING(LID_CHANGE), | |
56 | RDS_IB_EVENT_STRING(PKEY_CHANGE), | |
57 | RDS_IB_EVENT_STRING(SM_CHANGE), | |
58 | RDS_IB_EVENT_STRING(SRQ_ERR), | |
59 | RDS_IB_EVENT_STRING(SRQ_LIMIT_REACHED), | |
60 | RDS_IB_EVENT_STRING(QP_LAST_WQE_REACHED), | |
61 | RDS_IB_EVENT_STRING(CLIENT_REREGISTER), | |
62 | #undef RDS_IB_EVENT_STRING | |
63 | }; | |
64 | ||
65 | static char *rds_ib_event_str(enum ib_event_type type) | |
66 | { | |
59f740a6 ZB |
67 | return rds_str_array(rds_ib_event_type_strings, |
68 | ARRAY_SIZE(rds_ib_event_type_strings), type); | |
1bde04a6 ZB |
69 | }; |
70 | ||
ec16227e AG |
71 | /* |
72 | * Set the selected protocol version | |
73 | */ | |
74 | static void rds_ib_set_protocol(struct rds_connection *conn, unsigned int version) | |
75 | { | |
76 | conn->c_version = version; | |
77 | } | |
78 | ||
79 | /* | |
80 | * Set up flow control | |
81 | */ | |
82 | static void rds_ib_set_flow_control(struct rds_connection *conn, u32 credits) | |
83 | { | |
84 | struct rds_ib_connection *ic = conn->c_transport_data; | |
85 | ||
86 | if (rds_ib_sysctl_flow_control && credits != 0) { | |
87 | /* We're doing flow control */ | |
88 | ic->i_flowctl = 1; | |
89 | rds_ib_send_add_credits(conn, credits); | |
90 | } else { | |
91 | ic->i_flowctl = 0; | |
92 | } | |
93 | } | |
94 | ||
95 | /* | |
96 | * Tune RNR behavior. Without flow control, we use a rather | |
97 | * low timeout, but not the absolute minimum - this should | |
98 | * be tunable. | |
99 | * | |
100 | * We already set the RNR retry count to 7 (which is the | |
101 | * smallest infinite number :-) above. | |
102 | * If flow control is off, we want to change this back to 0 | |
103 | * so that we learn quickly when our credit accounting is | |
104 | * buggy. | |
105 | * | |
106 | * Caller passes in a qp_attr pointer - don't waste stack spacv | |
107 | * by allocation this twice. | |
108 | */ | |
109 | static void | |
110 | rds_ib_tune_rnr(struct rds_ib_connection *ic, struct ib_qp_attr *attr) | |
111 | { | |
112 | int ret; | |
113 | ||
114 | attr->min_rnr_timer = IB_RNR_TIMER_000_32; | |
115 | ret = ib_modify_qp(ic->i_cm_id->qp, attr, IB_QP_MIN_RNR_TIMER); | |
116 | if (ret) | |
117 | printk(KERN_NOTICE "ib_modify_qp(IB_QP_MIN_RNR_TIMER): err=%d\n", -ret); | |
118 | } | |
119 | ||
120 | /* | |
121 | * Connection established. | |
122 | * We get here for both outgoing and incoming connection. | |
123 | */ | |
124 | void rds_ib_cm_connect_complete(struct rds_connection *conn, struct rdma_cm_event *event) | |
125 | { | |
126 | const struct rds_ib_connect_private *dp = NULL; | |
127 | struct rds_ib_connection *ic = conn->c_transport_data; | |
ec16227e AG |
128 | struct ib_qp_attr qp_attr; |
129 | int err; | |
130 | ||
9ddbcfa0 | 131 | if (event->param.conn.private_data_len >= sizeof(*dp)) { |
ec16227e AG |
132 | dp = event->param.conn.private_data; |
133 | ||
02a6a259 AG |
134 | /* make sure it isn't empty data */ |
135 | if (dp->dp_protocol_major) { | |
136 | rds_ib_set_protocol(conn, | |
ec16227e | 137 | RDS_PROTOCOL(dp->dp_protocol_major, |
02a6a259 AG |
138 | dp->dp_protocol_minor)); |
139 | rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit)); | |
140 | } | |
ec16227e AG |
141 | } |
142 | ||
f147dd9e AG |
143 | if (conn->c_version < RDS_PROTOCOL(3,1)) { |
144 | printk(KERN_NOTICE "RDS/IB: Connection to %pI4 version %u.%u failed," | |
145 | " no longer supported\n", | |
146 | &conn->c_faddr, | |
147 | RDS_PROTOCOL_MAJOR(conn->c_version), | |
148 | RDS_PROTOCOL_MINOR(conn->c_version)); | |
149 | rds_conn_destroy(conn); | |
150 | return; | |
151 | } else { | |
152 | printk(KERN_NOTICE "RDS/IB: connected to %pI4 version %u.%u%s\n", | |
153 | &conn->c_faddr, | |
154 | RDS_PROTOCOL_MAJOR(conn->c_version), | |
155 | RDS_PROTOCOL_MINOR(conn->c_version), | |
156 | ic->i_flowctl ? ", flow control" : ""); | |
157 | } | |
ec16227e | 158 | |
e11d912a AG |
159 | /* |
160 | * Init rings and fill recv. this needs to wait until protocol negotiation | |
161 | * is complete, since ring layout is different from 3.0 to 3.1. | |
162 | */ | |
163 | rds_ib_send_init_ring(ic); | |
164 | rds_ib_recv_init_ring(ic); | |
165 | /* Post receive buffers - as a side effect, this will update | |
166 | * the posted credit count. */ | |
f17a1a55 | 167 | rds_ib_recv_refill(conn, 1); |
e11d912a | 168 | |
ec16227e AG |
169 | /* Tune RNR behavior */ |
170 | rds_ib_tune_rnr(ic, &qp_attr); | |
171 | ||
172 | qp_attr.qp_state = IB_QPS_RTS; | |
173 | err = ib_modify_qp(ic->i_cm_id->qp, &qp_attr, IB_QP_STATE); | |
174 | if (err) | |
175 | printk(KERN_NOTICE "ib_modify_qp(IB_QP_STATE, RTS): err=%d\n", err); | |
176 | ||
3e0249f9 ZB |
177 | /* update ib_device with this local ipaddr */ |
178 | err = rds_ib_update_ipaddr(ic->rds_ibdev, conn->c_laddr); | |
ec16227e | 179 | if (err) |
3e0249f9 ZB |
180 | printk(KERN_ERR "rds_ib_update_ipaddr failed (%d)\n", |
181 | err); | |
ec16227e AG |
182 | |
183 | /* If the peer gave us the last packet it saw, process this as if | |
184 | * we had received a regular ACK. */ | |
185 | if (dp && dp->dp_ack_seq) | |
186 | rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL); | |
187 | ||
188 | rds_connect_complete(conn); | |
189 | } | |
190 | ||
191 | static void rds_ib_cm_fill_conn_param(struct rds_connection *conn, | |
192 | struct rdma_conn_param *conn_param, | |
193 | struct rds_ib_connect_private *dp, | |
40589e74 AG |
194 | u32 protocol_version, |
195 | u32 max_responder_resources, | |
196 | u32 max_initiator_depth) | |
ec16227e | 197 | { |
40589e74 | 198 | struct rds_ib_connection *ic = conn->c_transport_data; |
3e0249f9 | 199 | struct rds_ib_device *rds_ibdev = ic->rds_ibdev; |
40589e74 | 200 | |
ec16227e | 201 | memset(conn_param, 0, sizeof(struct rdma_conn_param)); |
40589e74 | 202 | |
40589e74 AG |
203 | conn_param->responder_resources = |
204 | min_t(u32, rds_ibdev->max_responder_resources, max_responder_resources); | |
205 | conn_param->initiator_depth = | |
206 | min_t(u32, rds_ibdev->max_initiator_depth, max_initiator_depth); | |
3ba23ade | 207 | conn_param->retry_count = min_t(unsigned int, rds_ib_retry_count, 7); |
ec16227e AG |
208 | conn_param->rnr_retry_count = 7; |
209 | ||
210 | if (dp) { | |
ec16227e AG |
211 | memset(dp, 0, sizeof(*dp)); |
212 | dp->dp_saddr = conn->c_laddr; | |
213 | dp->dp_daddr = conn->c_faddr; | |
214 | dp->dp_protocol_major = RDS_PROTOCOL_MAJOR(protocol_version); | |
215 | dp->dp_protocol_minor = RDS_PROTOCOL_MINOR(protocol_version); | |
216 | dp->dp_protocol_minor_mask = cpu_to_be16(RDS_IB_SUPPORTED_PROTOCOLS); | |
217 | dp->dp_ack_seq = rds_ib_piggyb_ack(ic); | |
218 | ||
219 | /* Advertise flow control */ | |
220 | if (ic->i_flowctl) { | |
221 | unsigned int credits; | |
222 | ||
223 | credits = IB_GET_POST_CREDITS(atomic_read(&ic->i_credits)); | |
224 | dp->dp_credit = cpu_to_be32(credits); | |
225 | atomic_sub(IB_SET_POST_CREDITS(credits), &ic->i_credits); | |
226 | } | |
227 | ||
228 | conn_param->private_data = dp; | |
229 | conn_param->private_data_len = sizeof(*dp); | |
230 | } | |
231 | } | |
232 | ||
233 | static void rds_ib_cq_event_handler(struct ib_event *event, void *data) | |
234 | { | |
1bde04a6 ZB |
235 | rdsdebug("event %u (%s) data %p\n", |
236 | event->event, rds_ib_event_str(event->event), data); | |
ec16227e AG |
237 | } |
238 | ||
239 | static void rds_ib_qp_event_handler(struct ib_event *event, void *data) | |
240 | { | |
241 | struct rds_connection *conn = data; | |
242 | struct rds_ib_connection *ic = conn->c_transport_data; | |
243 | ||
1bde04a6 ZB |
244 | rdsdebug("conn %p ic %p event %u (%s)\n", conn, ic, event->event, |
245 | rds_ib_event_str(event->event)); | |
ec16227e AG |
246 | |
247 | switch (event->event) { | |
248 | case IB_EVENT_COMM_EST: | |
249 | rdma_notify(ic->i_cm_id, IB_EVENT_COMM_EST); | |
250 | break; | |
251 | default: | |
1bde04a6 | 252 | rdsdebug("Fatal QP Event %u (%s) " |
fdf6e6b4 | 253 | "- connection %pI4->%pI4, reconnecting\n", |
1bde04a6 ZB |
254 | event->event, rds_ib_event_str(event->event), |
255 | &conn->c_laddr, &conn->c_faddr); | |
97069788 | 256 | rds_conn_drop(conn); |
ec16227e AG |
257 | break; |
258 | } | |
259 | } | |
260 | ||
261 | /* | |
262 | * This needs to be very careful to not leave IS_ERR pointers around for | |
263 | * cleanup to trip over. | |
264 | */ | |
265 | static int rds_ib_setup_qp(struct rds_connection *conn) | |
266 | { | |
267 | struct rds_ib_connection *ic = conn->c_transport_data; | |
268 | struct ib_device *dev = ic->i_cm_id->device; | |
269 | struct ib_qp_init_attr attr; | |
270 | struct rds_ib_device *rds_ibdev; | |
271 | int ret; | |
272 | ||
3e0249f9 ZB |
273 | /* |
274 | * It's normal to see a null device if an incoming connection races | |
275 | * with device removal, so we don't print a warning. | |
ec16227e | 276 | */ |
3e0249f9 ZB |
277 | rds_ibdev = rds_ib_get_client_data(dev); |
278 | if (!rds_ibdev) | |
ec16227e | 279 | return -EOPNOTSUPP; |
3e0249f9 ZB |
280 | |
281 | /* add the conn now so that connection establishment has the dev */ | |
282 | rds_ib_add_conn(rds_ibdev, conn); | |
ec16227e AG |
283 | |
284 | if (rds_ibdev->max_wrs < ic->i_send_ring.w_nr + 1) | |
285 | rds_ib_ring_resize(&ic->i_send_ring, rds_ibdev->max_wrs - 1); | |
286 | if (rds_ibdev->max_wrs < ic->i_recv_ring.w_nr + 1) | |
287 | rds_ib_ring_resize(&ic->i_recv_ring, rds_ibdev->max_wrs - 1); | |
288 | ||
289 | /* Protection domain and memory range */ | |
290 | ic->i_pd = rds_ibdev->pd; | |
291 | ic->i_mr = rds_ibdev->mr; | |
292 | ||
293 | ic->i_send_cq = ib_create_cq(dev, rds_ib_send_cq_comp_handler, | |
294 | rds_ib_cq_event_handler, conn, | |
295 | ic->i_send_ring.w_nr + 1, 0); | |
296 | if (IS_ERR(ic->i_send_cq)) { | |
297 | ret = PTR_ERR(ic->i_send_cq); | |
298 | ic->i_send_cq = NULL; | |
299 | rdsdebug("ib_create_cq send failed: %d\n", ret); | |
300 | goto out; | |
301 | } | |
302 | ||
303 | ic->i_recv_cq = ib_create_cq(dev, rds_ib_recv_cq_comp_handler, | |
304 | rds_ib_cq_event_handler, conn, | |
305 | ic->i_recv_ring.w_nr, 0); | |
306 | if (IS_ERR(ic->i_recv_cq)) { | |
307 | ret = PTR_ERR(ic->i_recv_cq); | |
308 | ic->i_recv_cq = NULL; | |
309 | rdsdebug("ib_create_cq recv failed: %d\n", ret); | |
310 | goto out; | |
311 | } | |
312 | ||
313 | ret = ib_req_notify_cq(ic->i_send_cq, IB_CQ_NEXT_COMP); | |
314 | if (ret) { | |
315 | rdsdebug("ib_req_notify_cq send failed: %d\n", ret); | |
316 | goto out; | |
317 | } | |
318 | ||
319 | ret = ib_req_notify_cq(ic->i_recv_cq, IB_CQ_SOLICITED); | |
320 | if (ret) { | |
321 | rdsdebug("ib_req_notify_cq recv failed: %d\n", ret); | |
322 | goto out; | |
323 | } | |
324 | ||
325 | /* XXX negotiate max send/recv with remote? */ | |
326 | memset(&attr, 0, sizeof(attr)); | |
327 | attr.event_handler = rds_ib_qp_event_handler; | |
328 | attr.qp_context = conn; | |
329 | /* + 1 to allow for the single ack message */ | |
330 | attr.cap.max_send_wr = ic->i_send_ring.w_nr + 1; | |
331 | attr.cap.max_recv_wr = ic->i_recv_ring.w_nr + 1; | |
332 | attr.cap.max_send_sge = rds_ibdev->max_sge; | |
333 | attr.cap.max_recv_sge = RDS_IB_RECV_SGE; | |
334 | attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
335 | attr.qp_type = IB_QPT_RC; | |
336 | attr.send_cq = ic->i_send_cq; | |
337 | attr.recv_cq = ic->i_recv_cq; | |
338 | ||
339 | /* | |
340 | * XXX this can fail if max_*_wr is too large? Are we supposed | |
341 | * to back off until we get a value that the hardware can support? | |
342 | */ | |
343 | ret = rdma_create_qp(ic->i_cm_id, ic->i_pd, &attr); | |
344 | if (ret) { | |
345 | rdsdebug("rdma_create_qp failed: %d\n", ret); | |
346 | goto out; | |
347 | } | |
348 | ||
349 | ic->i_send_hdrs = ib_dma_alloc_coherent(dev, | |
350 | ic->i_send_ring.w_nr * | |
351 | sizeof(struct rds_header), | |
352 | &ic->i_send_hdrs_dma, GFP_KERNEL); | |
8690bfa1 | 353 | if (!ic->i_send_hdrs) { |
ec16227e AG |
354 | ret = -ENOMEM; |
355 | rdsdebug("ib_dma_alloc_coherent send failed\n"); | |
356 | goto out; | |
357 | } | |
358 | ||
359 | ic->i_recv_hdrs = ib_dma_alloc_coherent(dev, | |
360 | ic->i_recv_ring.w_nr * | |
361 | sizeof(struct rds_header), | |
362 | &ic->i_recv_hdrs_dma, GFP_KERNEL); | |
8690bfa1 | 363 | if (!ic->i_recv_hdrs) { |
ec16227e AG |
364 | ret = -ENOMEM; |
365 | rdsdebug("ib_dma_alloc_coherent recv failed\n"); | |
366 | goto out; | |
367 | } | |
368 | ||
369 | ic->i_ack = ib_dma_alloc_coherent(dev, sizeof(struct rds_header), | |
370 | &ic->i_ack_dma, GFP_KERNEL); | |
8690bfa1 | 371 | if (!ic->i_ack) { |
ec16227e AG |
372 | ret = -ENOMEM; |
373 | rdsdebug("ib_dma_alloc_coherent ack failed\n"); | |
374 | goto out; | |
375 | } | |
376 | ||
e4c52c98 AG |
377 | ic->i_sends = vmalloc_node(ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work), |
378 | ibdev_to_node(dev)); | |
8690bfa1 | 379 | if (!ic->i_sends) { |
ec16227e AG |
380 | ret = -ENOMEM; |
381 | rdsdebug("send allocation failed\n"); | |
382 | goto out; | |
383 | } | |
e11d912a | 384 | memset(ic->i_sends, 0, ic->i_send_ring.w_nr * sizeof(struct rds_ib_send_work)); |
ec16227e | 385 | |
e4c52c98 AG |
386 | ic->i_recvs = vmalloc_node(ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work), |
387 | ibdev_to_node(dev)); | |
8690bfa1 | 388 | if (!ic->i_recvs) { |
ec16227e AG |
389 | ret = -ENOMEM; |
390 | rdsdebug("recv allocation failed\n"); | |
391 | goto out; | |
392 | } | |
e11d912a | 393 | memset(ic->i_recvs, 0, ic->i_recv_ring.w_nr * sizeof(struct rds_ib_recv_work)); |
ec16227e | 394 | |
ec16227e AG |
395 | rds_ib_recv_init_ack(ic); |
396 | ||
ec16227e AG |
397 | rdsdebug("conn %p pd %p mr %p cq %p %p\n", conn, ic->i_pd, ic->i_mr, |
398 | ic->i_send_cq, ic->i_recv_cq); | |
399 | ||
400 | out: | |
3e0249f9 | 401 | rds_ib_dev_put(rds_ibdev); |
ec16227e AG |
402 | return ret; |
403 | } | |
404 | ||
9ddbcfa0 | 405 | static u32 rds_ib_protocol_compatible(struct rdma_cm_event *event) |
ec16227e | 406 | { |
9ddbcfa0 | 407 | const struct rds_ib_connect_private *dp = event->param.conn.private_data; |
ec16227e AG |
408 | u16 common; |
409 | u32 version = 0; | |
410 | ||
9ddbcfa0 AG |
411 | /* |
412 | * rdma_cm private data is odd - when there is any private data in the | |
ec16227e AG |
413 | * request, we will be given a pretty large buffer without telling us the |
414 | * original size. The only way to tell the difference is by looking at | |
415 | * the contents, which are initialized to zero. | |
416 | * If the protocol version fields aren't set, this is a connection attempt | |
417 | * from an older version. This could could be 3.0 or 2.0 - we can't tell. | |
9ddbcfa0 AG |
418 | * We really should have changed this for OFED 1.3 :-( |
419 | */ | |
420 | ||
421 | /* Be paranoid. RDS always has privdata */ | |
422 | if (!event->param.conn.private_data_len) { | |
423 | printk(KERN_NOTICE "RDS incoming connection has no private data, " | |
424 | "rejecting\n"); | |
425 | return 0; | |
426 | } | |
427 | ||
428 | /* Even if len is crap *now* I still want to check it. -ASG */ | |
f64f9e71 JP |
429 | if (event->param.conn.private_data_len < sizeof (*dp) || |
430 | dp->dp_protocol_major == 0) | |
ec16227e AG |
431 | return RDS_PROTOCOL_3_0; |
432 | ||
433 | common = be16_to_cpu(dp->dp_protocol_minor_mask) & RDS_IB_SUPPORTED_PROTOCOLS; | |
434 | if (dp->dp_protocol_major == 3 && common) { | |
435 | version = RDS_PROTOCOL_3_0; | |
436 | while ((common >>= 1) != 0) | |
437 | version++; | |
438 | } else if (printk_ratelimit()) { | |
439 | printk(KERN_NOTICE "RDS: Connection from %pI4 using " | |
440 | "incompatible protocol version %u.%u\n", | |
441 | &dp->dp_saddr, | |
442 | dp->dp_protocol_major, | |
443 | dp->dp_protocol_minor); | |
444 | } | |
445 | return version; | |
446 | } | |
447 | ||
448 | int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id, | |
449 | struct rdma_cm_event *event) | |
450 | { | |
451 | __be64 lguid = cm_id->route.path_rec->sgid.global.interface_id; | |
452 | __be64 fguid = cm_id->route.path_rec->dgid.global.interface_id; | |
453 | const struct rds_ib_connect_private *dp = event->param.conn.private_data; | |
454 | struct rds_ib_connect_private dp_rep; | |
455 | struct rds_connection *conn = NULL; | |
456 | struct rds_ib_connection *ic = NULL; | |
457 | struct rdma_conn_param conn_param; | |
458 | u32 version; | |
a46ca94e | 459 | int err = 1, destroy = 1; |
ec16227e AG |
460 | |
461 | /* Check whether the remote protocol version matches ours. */ | |
9ddbcfa0 | 462 | version = rds_ib_protocol_compatible(event); |
ec16227e AG |
463 | if (!version) |
464 | goto out; | |
465 | ||
466 | rdsdebug("saddr %pI4 daddr %pI4 RDSv%u.%u lguid 0x%llx fguid " | |
467 | "0x%llx\n", &dp->dp_saddr, &dp->dp_daddr, | |
468 | RDS_PROTOCOL_MAJOR(version), RDS_PROTOCOL_MINOR(version), | |
469 | (unsigned long long)be64_to_cpu(lguid), | |
470 | (unsigned long long)be64_to_cpu(fguid)); | |
471 | ||
472 | conn = rds_conn_create(dp->dp_daddr, dp->dp_saddr, &rds_ib_transport, | |
473 | GFP_KERNEL); | |
474 | if (IS_ERR(conn)) { | |
475 | rdsdebug("rds_conn_create failed (%ld)\n", PTR_ERR(conn)); | |
476 | conn = NULL; | |
477 | goto out; | |
478 | } | |
479 | ||
480 | /* | |
481 | * The connection request may occur while the | |
482 | * previous connection exist, e.g. in case of failover. | |
483 | * But as connections may be initiated simultaneously | |
484 | * by both hosts, we have a random backoff mechanism - | |
485 | * see the comment above rds_queue_reconnect() | |
486 | */ | |
487 | mutex_lock(&conn->c_cm_lock); | |
488 | if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) { | |
489 | if (rds_conn_state(conn) == RDS_CONN_UP) { | |
490 | rdsdebug("incoming connect while connecting\n"); | |
491 | rds_conn_drop(conn); | |
492 | rds_ib_stats_inc(s_ib_listen_closed_stale); | |
493 | } else | |
494 | if (rds_conn_state(conn) == RDS_CONN_CONNECTING) { | |
495 | /* Wait and see - our connect may still be succeeding */ | |
496 | rds_ib_stats_inc(s_ib_connect_raced); | |
497 | } | |
ec16227e AG |
498 | goto out; |
499 | } | |
500 | ||
501 | ic = conn->c_transport_data; | |
502 | ||
503 | rds_ib_set_protocol(conn, version); | |
504 | rds_ib_set_flow_control(conn, be32_to_cpu(dp->dp_credit)); | |
505 | ||
506 | /* If the peer gave us the last packet it saw, process this as if | |
507 | * we had received a regular ACK. */ | |
508 | if (dp->dp_ack_seq) | |
509 | rds_send_drop_acked(conn, be64_to_cpu(dp->dp_ack_seq), NULL); | |
510 | ||
511 | BUG_ON(cm_id->context); | |
512 | BUG_ON(ic->i_cm_id); | |
513 | ||
514 | ic->i_cm_id = cm_id; | |
515 | cm_id->context = conn; | |
516 | ||
517 | /* We got halfway through setting up the ib_connection, if we | |
518 | * fail now, we have to take the long route out of this mess. */ | |
519 | destroy = 0; | |
520 | ||
521 | err = rds_ib_setup_qp(conn); | |
522 | if (err) { | |
523 | rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", err); | |
524 | goto out; | |
525 | } | |
526 | ||
40589e74 AG |
527 | rds_ib_cm_fill_conn_param(conn, &conn_param, &dp_rep, version, |
528 | event->param.conn.responder_resources, | |
529 | event->param.conn.initiator_depth); | |
ec16227e AG |
530 | |
531 | /* rdma_accept() calls rdma_reject() internally if it fails */ | |
532 | err = rdma_accept(cm_id, &conn_param); | |
a46ca94e | 533 | if (err) |
ec16227e | 534 | rds_ib_conn_error(conn, "rdma_accept failed (%d)\n", err); |
ec16227e AG |
535 | |
536 | out: | |
a46ca94e ZB |
537 | if (conn) |
538 | mutex_unlock(&conn->c_cm_lock); | |
539 | if (err) | |
540 | rdma_reject(cm_id, NULL, 0); | |
ec16227e AG |
541 | return destroy; |
542 | } | |
543 | ||
544 | ||
545 | int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id) | |
546 | { | |
547 | struct rds_connection *conn = cm_id->context; | |
548 | struct rds_ib_connection *ic = conn->c_transport_data; | |
549 | struct rdma_conn_param conn_param; | |
550 | struct rds_ib_connect_private dp; | |
551 | int ret; | |
552 | ||
553 | /* If the peer doesn't do protocol negotiation, we must | |
554 | * default to RDSv3.0 */ | |
555 | rds_ib_set_protocol(conn, RDS_PROTOCOL_3_0); | |
556 | ic->i_flowctl = rds_ib_sysctl_flow_control; /* advertise flow control */ | |
557 | ||
558 | ret = rds_ib_setup_qp(conn); | |
559 | if (ret) { | |
560 | rds_ib_conn_error(conn, "rds_ib_setup_qp failed (%d)\n", ret); | |
561 | goto out; | |
562 | } | |
563 | ||
40589e74 AG |
564 | rds_ib_cm_fill_conn_param(conn, &conn_param, &dp, RDS_PROTOCOL_VERSION, |
565 | UINT_MAX, UINT_MAX); | |
ec16227e AG |
566 | ret = rdma_connect(cm_id, &conn_param); |
567 | if (ret) | |
568 | rds_ib_conn_error(conn, "rdma_connect failed (%d)\n", ret); | |
569 | ||
570 | out: | |
571 | /* Beware - returning non-zero tells the rdma_cm to destroy | |
572 | * the cm_id. We should certainly not do it as long as we still | |
573 | * "own" the cm_id. */ | |
574 | if (ret) { | |
575 | if (ic->i_cm_id == cm_id) | |
576 | ret = 0; | |
577 | } | |
578 | return ret; | |
579 | } | |
580 | ||
581 | int rds_ib_conn_connect(struct rds_connection *conn) | |
582 | { | |
583 | struct rds_ib_connection *ic = conn->c_transport_data; | |
584 | struct sockaddr_in src, dest; | |
585 | int ret; | |
586 | ||
587 | /* XXX I wonder what affect the port space has */ | |
588 | /* delegate cm event handler to rdma_transport */ | |
589 | ic->i_cm_id = rdma_create_id(rds_rdma_cm_event_handler, conn, | |
590 | RDMA_PS_TCP); | |
591 | if (IS_ERR(ic->i_cm_id)) { | |
592 | ret = PTR_ERR(ic->i_cm_id); | |
593 | ic->i_cm_id = NULL; | |
594 | rdsdebug("rdma_create_id() failed: %d\n", ret); | |
595 | goto out; | |
596 | } | |
597 | ||
598 | rdsdebug("created cm id %p for conn %p\n", ic->i_cm_id, conn); | |
599 | ||
600 | src.sin_family = AF_INET; | |
601 | src.sin_addr.s_addr = (__force u32)conn->c_laddr; | |
602 | src.sin_port = (__force u16)htons(0); | |
603 | ||
604 | dest.sin_family = AF_INET; | |
605 | dest.sin_addr.s_addr = (__force u32)conn->c_faddr; | |
606 | dest.sin_port = (__force u16)htons(RDS_PORT); | |
607 | ||
608 | ret = rdma_resolve_addr(ic->i_cm_id, (struct sockaddr *)&src, | |
609 | (struct sockaddr *)&dest, | |
610 | RDS_RDMA_RESOLVE_TIMEOUT_MS); | |
611 | if (ret) { | |
612 | rdsdebug("addr resolve failed for cm id %p: %d\n", ic->i_cm_id, | |
613 | ret); | |
614 | rdma_destroy_id(ic->i_cm_id); | |
615 | ic->i_cm_id = NULL; | |
616 | } | |
617 | ||
618 | out: | |
619 | return ret; | |
620 | } | |
621 | ||
622 | /* | |
623 | * This is so careful about only cleaning up resources that were built up | |
624 | * so that it can be called at any point during startup. In fact it | |
625 | * can be called multiple times for a given connection. | |
626 | */ | |
627 | void rds_ib_conn_shutdown(struct rds_connection *conn) | |
628 | { | |
629 | struct rds_ib_connection *ic = conn->c_transport_data; | |
630 | int err = 0; | |
631 | ||
632 | rdsdebug("cm %p pd %p cq %p %p qp %p\n", ic->i_cm_id, | |
633 | ic->i_pd, ic->i_send_cq, ic->i_recv_cq, | |
634 | ic->i_cm_id ? ic->i_cm_id->qp : NULL); | |
635 | ||
636 | if (ic->i_cm_id) { | |
637 | struct ib_device *dev = ic->i_cm_id->device; | |
638 | ||
639 | rdsdebug("disconnecting cm %p\n", ic->i_cm_id); | |
640 | err = rdma_disconnect(ic->i_cm_id); | |
641 | if (err) { | |
642 | /* Actually this may happen quite frequently, when | |
643 | * an outgoing connect raced with an incoming connect. | |
644 | */ | |
645 | rdsdebug("failed to disconnect, cm: %p err %d\n", | |
646 | ic->i_cm_id, err); | |
647 | } | |
648 | ||
e32b4a70 | 649 | /* |
f046011c ZB |
650 | * We want to wait for tx and rx completion to finish |
651 | * before we tear down the connection, but we have to be | |
652 | * careful not to get stuck waiting on a send ring that | |
653 | * only has unsignaled sends in it. We've shutdown new | |
654 | * sends before getting here so by waiting for signaled | |
655 | * sends to complete we're ensured that there will be no | |
656 | * more tx processing. | |
e32b4a70 | 657 | */ |
ec16227e | 658 | wait_event(rds_ib_ring_empty_wait, |
f046011c ZB |
659 | rds_ib_ring_empty(&ic->i_recv_ring) && |
660 | (atomic_read(&ic->i_signaled_sends) == 0)); | |
661 | tasklet_kill(&ic->i_recv_tasklet); | |
ec16227e AG |
662 | |
663 | if (ic->i_send_hdrs) | |
664 | ib_dma_free_coherent(dev, | |
665 | ic->i_send_ring.w_nr * | |
666 | sizeof(struct rds_header), | |
667 | ic->i_send_hdrs, | |
668 | ic->i_send_hdrs_dma); | |
669 | ||
670 | if (ic->i_recv_hdrs) | |
671 | ib_dma_free_coherent(dev, | |
672 | ic->i_recv_ring.w_nr * | |
673 | sizeof(struct rds_header), | |
674 | ic->i_recv_hdrs, | |
675 | ic->i_recv_hdrs_dma); | |
676 | ||
677 | if (ic->i_ack) | |
678 | ib_dma_free_coherent(dev, sizeof(struct rds_header), | |
679 | ic->i_ack, ic->i_ack_dma); | |
680 | ||
681 | if (ic->i_sends) | |
682 | rds_ib_send_clear_ring(ic); | |
683 | if (ic->i_recvs) | |
684 | rds_ib_recv_clear_ring(ic); | |
685 | ||
686 | if (ic->i_cm_id->qp) | |
687 | rdma_destroy_qp(ic->i_cm_id); | |
688 | if (ic->i_send_cq) | |
689 | ib_destroy_cq(ic->i_send_cq); | |
690 | if (ic->i_recv_cq) | |
691 | ib_destroy_cq(ic->i_recv_cq); | |
692 | rdma_destroy_id(ic->i_cm_id); | |
693 | ||
694 | /* | |
695 | * Move connection back to the nodev list. | |
696 | */ | |
745cbcca AG |
697 | if (ic->rds_ibdev) |
698 | rds_ib_remove_conn(ic->rds_ibdev, conn); | |
ec16227e AG |
699 | |
700 | ic->i_cm_id = NULL; | |
701 | ic->i_pd = NULL; | |
702 | ic->i_mr = NULL; | |
703 | ic->i_send_cq = NULL; | |
704 | ic->i_recv_cq = NULL; | |
705 | ic->i_send_hdrs = NULL; | |
706 | ic->i_recv_hdrs = NULL; | |
707 | ic->i_ack = NULL; | |
708 | } | |
709 | BUG_ON(ic->rds_ibdev); | |
710 | ||
711 | /* Clear pending transmit */ | |
ff3d7d36 AG |
712 | if (ic->i_data_op) { |
713 | struct rds_message *rm; | |
714 | ||
715 | rm = container_of(ic->i_data_op, struct rds_message, data); | |
716 | rds_message_put(rm); | |
717 | ic->i_data_op = NULL; | |
ec16227e AG |
718 | } |
719 | ||
720 | /* Clear the ACK state */ | |
721 | clear_bit(IB_ACK_IN_FLIGHT, &ic->i_ack_flags); | |
8cbd9606 AG |
722 | #ifdef KERNEL_HAS_ATOMIC64 |
723 | atomic64_set(&ic->i_ack_next, 0); | |
724 | #else | |
725 | ic->i_ack_next = 0; | |
726 | #endif | |
ec16227e AG |
727 | ic->i_ack_recv = 0; |
728 | ||
729 | /* Clear flow control state */ | |
730 | ic->i_flowctl = 0; | |
731 | atomic_set(&ic->i_credits, 0); | |
732 | ||
733 | rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr); | |
734 | rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr); | |
735 | ||
736 | if (ic->i_ibinc) { | |
737 | rds_inc_put(&ic->i_ibinc->ii_inc); | |
738 | ic->i_ibinc = NULL; | |
739 | } | |
740 | ||
741 | vfree(ic->i_sends); | |
742 | ic->i_sends = NULL; | |
743 | vfree(ic->i_recvs); | |
744 | ic->i_recvs = NULL; | |
745 | } | |
746 | ||
747 | int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp) | |
748 | { | |
749 | struct rds_ib_connection *ic; | |
750 | unsigned long flags; | |
33244125 | 751 | int ret; |
ec16227e AG |
752 | |
753 | /* XXX too lazy? */ | |
754 | ic = kzalloc(sizeof(struct rds_ib_connection), GFP_KERNEL); | |
8690bfa1 | 755 | if (!ic) |
ec16227e AG |
756 | return -ENOMEM; |
757 | ||
33244125 CM |
758 | ret = rds_ib_recv_alloc_caches(ic); |
759 | if (ret) { | |
760 | kfree(ic); | |
761 | return ret; | |
762 | } | |
763 | ||
ec16227e | 764 | INIT_LIST_HEAD(&ic->ib_node); |
d521b63b AG |
765 | tasklet_init(&ic->i_recv_tasklet, rds_ib_recv_tasklet_fn, |
766 | (unsigned long) ic); | |
ec16227e | 767 | mutex_init(&ic->i_recv_mutex); |
8cbd9606 AG |
768 | #ifndef KERNEL_HAS_ATOMIC64 |
769 | spin_lock_init(&ic->i_ack_lock); | |
770 | #endif | |
f046011c | 771 | atomic_set(&ic->i_signaled_sends, 0); |
ec16227e AG |
772 | |
773 | /* | |
774 | * rds_ib_conn_shutdown() waits for these to be emptied so they | |
775 | * must be initialized before it can be called. | |
776 | */ | |
777 | rds_ib_ring_init(&ic->i_send_ring, rds_ib_sysctl_max_send_wr); | |
778 | rds_ib_ring_init(&ic->i_recv_ring, rds_ib_sysctl_max_recv_wr); | |
779 | ||
780 | ic->conn = conn; | |
781 | conn->c_transport_data = ic; | |
782 | ||
783 | spin_lock_irqsave(&ib_nodev_conns_lock, flags); | |
784 | list_add_tail(&ic->ib_node, &ib_nodev_conns); | |
785 | spin_unlock_irqrestore(&ib_nodev_conns_lock, flags); | |
786 | ||
787 | ||
788 | rdsdebug("conn %p conn ic %p\n", conn, conn->c_transport_data); | |
789 | return 0; | |
790 | } | |
791 | ||
745cbcca AG |
792 | /* |
793 | * Free a connection. Connection must be shut down and not set for reconnect. | |
794 | */ | |
ec16227e AG |
795 | void rds_ib_conn_free(void *arg) |
796 | { | |
797 | struct rds_ib_connection *ic = arg; | |
745cbcca AG |
798 | spinlock_t *lock_ptr; |
799 | ||
ec16227e | 800 | rdsdebug("ic %p\n", ic); |
745cbcca AG |
801 | |
802 | /* | |
803 | * Conn is either on a dev's list or on the nodev list. | |
804 | * A race with shutdown() or connect() would cause problems | |
805 | * (since rds_ibdev would change) but that should never happen. | |
806 | */ | |
807 | lock_ptr = ic->rds_ibdev ? &ic->rds_ibdev->spinlock : &ib_nodev_conns_lock; | |
808 | ||
809 | spin_lock_irq(lock_ptr); | |
ec16227e | 810 | list_del(&ic->ib_node); |
745cbcca AG |
811 | spin_unlock_irq(lock_ptr); |
812 | ||
33244125 CM |
813 | rds_ib_recv_free_caches(ic); |
814 | ||
ec16227e AG |
815 | kfree(ic); |
816 | } | |
817 | ||
818 | ||
819 | /* | |
820 | * An error occurred on the connection | |
821 | */ | |
822 | void | |
823 | __rds_ib_conn_error(struct rds_connection *conn, const char *fmt, ...) | |
824 | { | |
825 | va_list ap; | |
826 | ||
827 | rds_conn_drop(conn); | |
828 | ||
829 | va_start(ap, fmt); | |
830 | vprintk(fmt, ap); | |
831 | va_end(ap); | |
832 | } |