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Commit | Line | Data |
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fc79d4b1 TT |
1 | /* |
2 | * linux/fs/9p/trans_rdma.c | |
3 | * | |
4 | * RDMA transport layer based on the trans_fd.c implementation. | |
5 | * | |
6 | * Copyright (C) 2008 by Tom Tucker <tom@opengridcomputing.com> | |
7 | * Copyright (C) 2006 by Russ Cox <rsc@swtch.com> | |
8 | * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net> | |
9 | * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> | |
10 | * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License version 2 | |
14 | * as published by the Free Software Foundation. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to: | |
23 | * Free Software Foundation | |
24 | * 51 Franklin Street, Fifth Floor | |
25 | * Boston, MA 02111-1301 USA | |
26 | * | |
27 | */ | |
28 | ||
5d385153 JP |
29 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
30 | ||
fc79d4b1 TT |
31 | #include <linux/in.h> |
32 | #include <linux/module.h> | |
33 | #include <linux/net.h> | |
34 | #include <linux/ipv6.h> | |
35 | #include <linux/kthread.h> | |
36 | #include <linux/errno.h> | |
37 | #include <linux/kernel.h> | |
38 | #include <linux/un.h> | |
39 | #include <linux/uaccess.h> | |
40 | #include <linux/inet.h> | |
41 | #include <linux/idr.h> | |
42 | #include <linux/file.h> | |
43 | #include <linux/parser.h> | |
44 | #include <linux/semaphore.h> | |
5a0e3ad6 | 45 | #include <linux/slab.h> |
fc79d4b1 TT |
46 | #include <net/9p/9p.h> |
47 | #include <net/9p/client.h> | |
48 | #include <net/9p/transport.h> | |
49 | #include <rdma/ib_verbs.h> | |
50 | #include <rdma/rdma_cm.h> | |
fc79d4b1 TT |
51 | |
52 | #define P9_PORT 5640 | |
53 | #define P9_RDMA_SQ_DEPTH 32 | |
54 | #define P9_RDMA_RQ_DEPTH 32 | |
55 | #define P9_RDMA_SEND_SGE 4 | |
56 | #define P9_RDMA_RECV_SGE 4 | |
57 | #define P9_RDMA_IRD 0 | |
58 | #define P9_RDMA_ORD 0 | |
59 | #define P9_RDMA_TIMEOUT 30000 /* 30 seconds */ | |
3fcc62f4 | 60 | #define P9_RDMA_MAXSIZE (1024*1024) /* 1MB */ |
fc79d4b1 | 61 | |
fc79d4b1 TT |
62 | /** |
63 | * struct p9_trans_rdma - RDMA transport instance | |
64 | * | |
65 | * @state: tracks the transport state machine for connection setup and tear down | |
66 | * @cm_id: The RDMA CM ID | |
67 | * @pd: Protection Domain pointer | |
68 | * @qp: Queue Pair pointer | |
69 | * @cq: Completion Queue pointer | |
0e15597e | 70 | * @dm_mr: DMA Memory Region pointer |
fc79d4b1 TT |
71 | * @lkey: The local access only memory region key |
72 | * @timeout: Number of uSecs to wait for connection management events | |
73 | * @sq_depth: The depth of the Send Queue | |
74 | * @sq_sem: Semaphore for the SQ | |
75 | * @rq_depth: The depth of the Receive Queue. | |
fd453d0e | 76 | * @rq_sem: Semaphore for the RQ |
1cff3306 SD |
77 | * @excess_rc : Amount of posted Receive Contexts without a pending request. |
78 | * See rdma_request() | |
fc79d4b1 TT |
79 | * @addr: The remote peer's address |
80 | * @req_lock: Protects the active request list | |
fc79d4b1 TT |
81 | * @cm_done: Completion event for connection management tracking |
82 | */ | |
83 | struct p9_trans_rdma { | |
84 | enum { | |
85 | P9_RDMA_INIT, | |
86 | P9_RDMA_ADDR_RESOLVED, | |
87 | P9_RDMA_ROUTE_RESOLVED, | |
88 | P9_RDMA_CONNECTED, | |
89 | P9_RDMA_FLUSHING, | |
90 | P9_RDMA_CLOSING, | |
91 | P9_RDMA_CLOSED, | |
92 | } state; | |
93 | struct rdma_cm_id *cm_id; | |
94 | struct ib_pd *pd; | |
95 | struct ib_qp *qp; | |
96 | struct ib_cq *cq; | |
fc79d4b1 TT |
97 | long timeout; |
98 | int sq_depth; | |
99 | struct semaphore sq_sem; | |
100 | int rq_depth; | |
fd453d0e | 101 | struct semaphore rq_sem; |
1cff3306 | 102 | atomic_t excess_rc; |
fc79d4b1 TT |
103 | struct sockaddr_in addr; |
104 | spinlock_t req_lock; | |
105 | ||
106 | struct completion cm_done; | |
107 | }; | |
108 | ||
109 | /** | |
110 | * p9_rdma_context - Keeps track of in-process WR | |
111 | * | |
fc79d4b1 TT |
112 | * @busa: Bus address to unmap when the WR completes |
113 | * @req: Keeps track of requests (send) | |
114 | * @rc: Keepts track of replies (receive) | |
115 | */ | |
116 | struct p9_rdma_req; | |
117 | struct p9_rdma_context { | |
7cf20fc6 | 118 | struct ib_cqe cqe; |
fc79d4b1 TT |
119 | dma_addr_t busa; |
120 | union { | |
121 | struct p9_req_t *req; | |
122 | struct p9_fcall *rc; | |
123 | }; | |
124 | }; | |
125 | ||
126 | /** | |
127 | * p9_rdma_opts - Collection of mount options | |
128 | * @port: port of connection | |
129 | * @sq_depth: The requested depth of the SQ. This really doesn't need | |
130 | * to be any deeper than the number of threads used in the client | |
131 | * @rq_depth: The depth of the RQ. Should be greater than or equal to SQ depth | |
132 | * @timeout: Time to wait in msecs for CM events | |
133 | */ | |
134 | struct p9_rdma_opts { | |
135 | short port; | |
136 | int sq_depth; | |
137 | int rq_depth; | |
138 | long timeout; | |
f569d3ef | 139 | int privport; |
fc79d4b1 TT |
140 | }; |
141 | ||
142 | /* | |
143 | * Option Parsing (code inspired by NFS code) | |
144 | */ | |
145 | enum { | |
146 | /* Options that take integer arguments */ | |
f569d3ef DM |
147 | Opt_port, Opt_rq_depth, Opt_sq_depth, Opt_timeout, |
148 | /* Options that take no argument */ | |
149 | Opt_privport, | |
150 | Opt_err, | |
fc79d4b1 TT |
151 | }; |
152 | ||
153 | static match_table_t tokens = { | |
154 | {Opt_port, "port=%u"}, | |
155 | {Opt_sq_depth, "sq=%u"}, | |
156 | {Opt_rq_depth, "rq=%u"}, | |
157 | {Opt_timeout, "timeout=%u"}, | |
f569d3ef | 158 | {Opt_privport, "privport"}, |
fc79d4b1 TT |
159 | {Opt_err, NULL}, |
160 | }; | |
161 | ||
162 | /** | |
0e15597e AK |
163 | * parse_opts - parse mount options into rdma options structure |
164 | * @params: options string passed from mount | |
165 | * @opts: rdma transport-specific structure to parse options into | |
fc79d4b1 TT |
166 | * |
167 | * Returns 0 upon success, -ERRNO upon failure | |
168 | */ | |
169 | static int parse_opts(char *params, struct p9_rdma_opts *opts) | |
170 | { | |
171 | char *p; | |
172 | substring_t args[MAX_OPT_ARGS]; | |
173 | int option; | |
d8c8a9e3 | 174 | char *options, *tmp_options; |
fc79d4b1 TT |
175 | |
176 | opts->port = P9_PORT; | |
177 | opts->sq_depth = P9_RDMA_SQ_DEPTH; | |
178 | opts->rq_depth = P9_RDMA_RQ_DEPTH; | |
179 | opts->timeout = P9_RDMA_TIMEOUT; | |
f569d3ef | 180 | opts->privport = 0; |
fc79d4b1 TT |
181 | |
182 | if (!params) | |
183 | return 0; | |
184 | ||
d8c8a9e3 EVH |
185 | tmp_options = kstrdup(params, GFP_KERNEL); |
186 | if (!tmp_options) { | |
5d385153 JP |
187 | p9_debug(P9_DEBUG_ERROR, |
188 | "failed to allocate copy of option string\n"); | |
fc79d4b1 TT |
189 | return -ENOMEM; |
190 | } | |
d8c8a9e3 | 191 | options = tmp_options; |
fc79d4b1 TT |
192 | |
193 | while ((p = strsep(&options, ",")) != NULL) { | |
194 | int token; | |
195 | int r; | |
196 | if (!*p) | |
197 | continue; | |
198 | token = match_token(p, tokens, args); | |
f569d3ef DM |
199 | if ((token != Opt_err) && (token != Opt_privport)) { |
200 | r = match_int(&args[0], &option); | |
201 | if (r < 0) { | |
202 | p9_debug(P9_DEBUG_ERROR, | |
203 | "integer field, but no integer?\n"); | |
204 | continue; | |
205 | } | |
fc79d4b1 TT |
206 | } |
207 | switch (token) { | |
208 | case Opt_port: | |
209 | opts->port = option; | |
210 | break; | |
211 | case Opt_sq_depth: | |
212 | opts->sq_depth = option; | |
213 | break; | |
214 | case Opt_rq_depth: | |
215 | opts->rq_depth = option; | |
216 | break; | |
217 | case Opt_timeout: | |
218 | opts->timeout = option; | |
219 | break; | |
f569d3ef DM |
220 | case Opt_privport: |
221 | opts->privport = 1; | |
222 | break; | |
fc79d4b1 TT |
223 | default: |
224 | continue; | |
225 | } | |
226 | } | |
227 | /* RQ must be at least as large as the SQ */ | |
228 | opts->rq_depth = max(opts->rq_depth, opts->sq_depth); | |
d8c8a9e3 | 229 | kfree(tmp_options); |
fc79d4b1 TT |
230 | return 0; |
231 | } | |
232 | ||
233 | static int | |
234 | p9_cm_event_handler(struct rdma_cm_id *id, struct rdma_cm_event *event) | |
235 | { | |
236 | struct p9_client *c = id->context; | |
237 | struct p9_trans_rdma *rdma = c->trans; | |
238 | switch (event->event) { | |
239 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
240 | BUG_ON(rdma->state != P9_RDMA_INIT); | |
241 | rdma->state = P9_RDMA_ADDR_RESOLVED; | |
242 | break; | |
243 | ||
244 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
245 | BUG_ON(rdma->state != P9_RDMA_ADDR_RESOLVED); | |
246 | rdma->state = P9_RDMA_ROUTE_RESOLVED; | |
247 | break; | |
248 | ||
249 | case RDMA_CM_EVENT_ESTABLISHED: | |
250 | BUG_ON(rdma->state != P9_RDMA_ROUTE_RESOLVED); | |
251 | rdma->state = P9_RDMA_CONNECTED; | |
252 | break; | |
253 | ||
254 | case RDMA_CM_EVENT_DISCONNECTED: | |
255 | if (rdma) | |
256 | rdma->state = P9_RDMA_CLOSED; | |
257 | if (c) | |
258 | c->status = Disconnected; | |
259 | break; | |
260 | ||
261 | case RDMA_CM_EVENT_TIMEWAIT_EXIT: | |
262 | break; | |
263 | ||
264 | case RDMA_CM_EVENT_ADDR_CHANGE: | |
265 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
266 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
267 | case RDMA_CM_EVENT_MULTICAST_JOIN: | |
268 | case RDMA_CM_EVENT_MULTICAST_ERROR: | |
269 | case RDMA_CM_EVENT_REJECTED: | |
270 | case RDMA_CM_EVENT_CONNECT_REQUEST: | |
271 | case RDMA_CM_EVENT_CONNECT_RESPONSE: | |
272 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
273 | case RDMA_CM_EVENT_ADDR_ERROR: | |
274 | case RDMA_CM_EVENT_UNREACHABLE: | |
275 | c->status = Disconnected; | |
276 | rdma_disconnect(rdma->cm_id); | |
277 | break; | |
278 | default: | |
279 | BUG(); | |
280 | } | |
281 | complete(&rdma->cm_done); | |
282 | return 0; | |
283 | } | |
284 | ||
285 | static void | |
7cf20fc6 | 286 | recv_done(struct ib_cq *cq, struct ib_wc *wc) |
fc79d4b1 | 287 | { |
7cf20fc6 CH |
288 | struct p9_client *client = cq->cq_context; |
289 | struct p9_trans_rdma *rdma = client->trans; | |
290 | struct p9_rdma_context *c = | |
291 | container_of(wc->wr_cqe, struct p9_rdma_context, cqe); | |
fc79d4b1 TT |
292 | struct p9_req_t *req; |
293 | int err = 0; | |
294 | int16_t tag; | |
295 | ||
296 | req = NULL; | |
297 | ib_dma_unmap_single(rdma->cm_id->device, c->busa, client->msize, | |
298 | DMA_FROM_DEVICE); | |
299 | ||
7cf20fc6 | 300 | if (wc->status != IB_WC_SUCCESS) |
fc79d4b1 TT |
301 | goto err_out; |
302 | ||
303 | err = p9_parse_header(c->rc, NULL, NULL, &tag, 1); | |
304 | if (err) | |
305 | goto err_out; | |
306 | ||
307 | req = p9_tag_lookup(client, tag); | |
308 | if (!req) | |
309 | goto err_out; | |
310 | ||
47229ff8 SD |
311 | /* Check that we have not yet received a reply for this request. |
312 | */ | |
313 | if (unlikely(req->rc)) { | |
314 | pr_err("Duplicate reply for request %d", tag); | |
315 | goto err_out; | |
316 | } | |
317 | ||
fc79d4b1 | 318 | req->rc = c->rc; |
2b6e72ed | 319 | p9_client_cb(client, req, REQ_STATUS_RCVD); |
fc79d4b1 | 320 | |
7cf20fc6 CH |
321 | out: |
322 | up(&rdma->rq_sem); | |
323 | kfree(c); | |
fc79d4b1 TT |
324 | return; |
325 | ||
326 | err_out: | |
7cf20fc6 CH |
327 | p9_debug(P9_DEBUG_ERROR, "req %p err %d status %d\n", |
328 | req, err, wc->status); | |
fc79d4b1 TT |
329 | rdma->state = P9_RDMA_FLUSHING; |
330 | client->status = Disconnected; | |
7cf20fc6 | 331 | goto out; |
fc79d4b1 TT |
332 | } |
333 | ||
334 | static void | |
7cf20fc6 | 335 | send_done(struct ib_cq *cq, struct ib_wc *wc) |
fc79d4b1 | 336 | { |
7cf20fc6 CH |
337 | struct p9_client *client = cq->cq_context; |
338 | struct p9_trans_rdma *rdma = client->trans; | |
339 | struct p9_rdma_context *c = | |
340 | container_of(wc->wr_cqe, struct p9_rdma_context, cqe); | |
341 | ||
fc79d4b1 TT |
342 | ib_dma_unmap_single(rdma->cm_id->device, |
343 | c->busa, c->req->tc->size, | |
344 | DMA_TO_DEVICE); | |
7cf20fc6 CH |
345 | up(&rdma->sq_sem); |
346 | kfree(c); | |
fc79d4b1 TT |
347 | } |
348 | ||
349 | static void qp_event_handler(struct ib_event *event, void *context) | |
350 | { | |
5d385153 JP |
351 | p9_debug(P9_DEBUG_ERROR, "QP event %d context %p\n", |
352 | event->event, context); | |
fc79d4b1 TT |
353 | } |
354 | ||
fc79d4b1 TT |
355 | static void rdma_destroy_trans(struct p9_trans_rdma *rdma) |
356 | { | |
357 | if (!rdma) | |
358 | return; | |
359 | ||
fc79d4b1 TT |
360 | if (rdma->qp && !IS_ERR(rdma->qp)) |
361 | ib_destroy_qp(rdma->qp); | |
362 | ||
363 | if (rdma->pd && !IS_ERR(rdma->pd)) | |
364 | ib_dealloc_pd(rdma->pd); | |
365 | ||
366 | if (rdma->cq && !IS_ERR(rdma->cq)) | |
7cf20fc6 | 367 | ib_free_cq(rdma->cq); |
fc79d4b1 TT |
368 | |
369 | if (rdma->cm_id && !IS_ERR(rdma->cm_id)) | |
370 | rdma_destroy_id(rdma->cm_id); | |
371 | ||
372 | kfree(rdma); | |
373 | } | |
374 | ||
375 | static int | |
376 | post_recv(struct p9_client *client, struct p9_rdma_context *c) | |
377 | { | |
378 | struct p9_trans_rdma *rdma = client->trans; | |
379 | struct ib_recv_wr wr, *bad_wr; | |
380 | struct ib_sge sge; | |
381 | ||
382 | c->busa = ib_dma_map_single(rdma->cm_id->device, | |
383 | c->rc->sdata, client->msize, | |
384 | DMA_FROM_DEVICE); | |
385 | if (ib_dma_mapping_error(rdma->cm_id->device, c->busa)) | |
386 | goto error; | |
387 | ||
7cf20fc6 CH |
388 | c->cqe.done = recv_done; |
389 | ||
fc79d4b1 TT |
390 | sge.addr = c->busa; |
391 | sge.length = client->msize; | |
2f31fa88 | 392 | sge.lkey = rdma->pd->local_dma_lkey; |
fc79d4b1 TT |
393 | |
394 | wr.next = NULL; | |
7cf20fc6 | 395 | wr.wr_cqe = &c->cqe; |
fc79d4b1 TT |
396 | wr.sg_list = &sge; |
397 | wr.num_sge = 1; | |
398 | return ib_post_recv(rdma->qp, &wr, &bad_wr); | |
399 | ||
400 | error: | |
5d385153 | 401 | p9_debug(P9_DEBUG_ERROR, "EIO\n"); |
fc79d4b1 TT |
402 | return -EIO; |
403 | } | |
404 | ||
405 | static int rdma_request(struct p9_client *client, struct p9_req_t *req) | |
406 | { | |
407 | struct p9_trans_rdma *rdma = client->trans; | |
408 | struct ib_send_wr wr, *bad_wr; | |
409 | struct ib_sge sge; | |
410 | int err = 0; | |
411 | unsigned long flags; | |
412 | struct p9_rdma_context *c = NULL; | |
413 | struct p9_rdma_context *rpl_context = NULL; | |
414 | ||
1cff3306 SD |
415 | /* When an error occurs between posting the recv and the send, |
416 | * there will be a receive context posted without a pending request. | |
417 | * Since there is no way to "un-post" it, we remember it and skip | |
418 | * post_recv() for the next request. | |
419 | * So here, | |
420 | * see if we are this `next request' and need to absorb an excess rc. | |
421 | * If yes, then drop and free our own, and do not recv_post(). | |
422 | **/ | |
423 | if (unlikely(atomic_read(&rdma->excess_rc) > 0)) { | |
424 | if ((atomic_sub_return(1, &rdma->excess_rc) >= 0)) { | |
425 | /* Got one ! */ | |
426 | kfree(req->rc); | |
427 | req->rc = NULL; | |
428 | goto dont_need_post_recv; | |
429 | } else { | |
430 | /* We raced and lost. */ | |
431 | atomic_inc(&rdma->excess_rc); | |
432 | } | |
433 | } | |
434 | ||
fc79d4b1 | 435 | /* Allocate an fcall for the reply */ |
eeff66ef | 436 | rpl_context = kmalloc(sizeof *rpl_context, GFP_NOFS); |
1d6400c7 DB |
437 | if (!rpl_context) { |
438 | err = -ENOMEM; | |
2f52d07c | 439 | goto recv_error; |
1d6400c7 | 440 | } |
fc79d4b1 | 441 | rpl_context->rc = req->rc; |
fc79d4b1 TT |
442 | |
443 | /* | |
444 | * Post a receive buffer for this request. We need to ensure | |
445 | * there is a reply buffer available for every outstanding | |
446 | * request. A flushed request can result in no reply for an | |
447 | * outstanding request, so we must keep a count to avoid | |
448 | * overflowing the RQ. | |
449 | */ | |
2f52d07c SD |
450 | if (down_interruptible(&rdma->rq_sem)) { |
451 | err = -EINTR; | |
452 | goto recv_error; | |
453 | } | |
fd453d0e SD |
454 | |
455 | err = post_recv(client, rpl_context); | |
456 | if (err) { | |
457 | p9_debug(P9_DEBUG_FCALL, "POST RECV failed\n"); | |
2f52d07c | 458 | goto recv_error; |
fd453d0e | 459 | } |
fc79d4b1 TT |
460 | /* remove posted receive buffer from request structure */ |
461 | req->rc = NULL; | |
462 | ||
1cff3306 | 463 | dont_need_post_recv: |
fc79d4b1 | 464 | /* Post the request */ |
eeff66ef | 465 | c = kmalloc(sizeof *c, GFP_NOFS); |
1d6400c7 DB |
466 | if (!c) { |
467 | err = -ENOMEM; | |
2f52d07c | 468 | goto send_error; |
1d6400c7 | 469 | } |
fc79d4b1 TT |
470 | c->req = req; |
471 | ||
472 | c->busa = ib_dma_map_single(rdma->cm_id->device, | |
473 | c->req->tc->sdata, c->req->tc->size, | |
474 | DMA_TO_DEVICE); | |
2f52d07c SD |
475 | if (ib_dma_mapping_error(rdma->cm_id->device, c->busa)) { |
476 | err = -EIO; | |
477 | goto send_error; | |
478 | } | |
fc79d4b1 | 479 | |
7cf20fc6 CH |
480 | c->cqe.done = send_done; |
481 | ||
fc79d4b1 TT |
482 | sge.addr = c->busa; |
483 | sge.length = c->req->tc->size; | |
2f31fa88 | 484 | sge.lkey = rdma->pd->local_dma_lkey; |
fc79d4b1 TT |
485 | |
486 | wr.next = NULL; | |
7cf20fc6 | 487 | wr.wr_cqe = &c->cqe; |
fc79d4b1 TT |
488 | wr.opcode = IB_WR_SEND; |
489 | wr.send_flags = IB_SEND_SIGNALED; | |
490 | wr.sg_list = &sge; | |
491 | wr.num_sge = 1; | |
492 | ||
2f52d07c SD |
493 | if (down_interruptible(&rdma->sq_sem)) { |
494 | err = -EINTR; | |
495 | goto send_error; | |
496 | } | |
497 | ||
3f9d5b8d SD |
498 | /* Mark request as `sent' *before* we actually send it, |
499 | * because doing if after could erase the REQ_STATUS_RCVD | |
500 | * status in case of a very fast reply. | |
501 | */ | |
502 | req->status = REQ_STATUS_SENT; | |
2f52d07c SD |
503 | err = ib_post_send(rdma->qp, &wr, &bad_wr); |
504 | if (err) | |
505 | goto send_error; | |
fc79d4b1 | 506 | |
2f52d07c SD |
507 | /* Success */ |
508 | return 0; | |
fc79d4b1 | 509 | |
2f52d07c SD |
510 | /* Handle errors that happened during or while preparing the send: */ |
511 | send_error: | |
3f9d5b8d | 512 | req->status = REQ_STATUS_ERROR; |
1d6400c7 | 513 | kfree(c); |
2f52d07c | 514 | p9_debug(P9_DEBUG_ERROR, "Error %d in rdma_request()\n", err); |
1cff3306 SD |
515 | |
516 | /* Ach. | |
517 | * We did recv_post(), but not send. We have one recv_post in excess. | |
518 | */ | |
519 | atomic_inc(&rdma->excess_rc); | |
2f52d07c SD |
520 | return err; |
521 | ||
522 | /* Handle errors that happened during or while preparing post_recv(): */ | |
523 | recv_error: | |
1d6400c7 | 524 | kfree(rpl_context); |
fc79d4b1 TT |
525 | spin_lock_irqsave(&rdma->req_lock, flags); |
526 | if (rdma->state < P9_RDMA_CLOSING) { | |
527 | rdma->state = P9_RDMA_CLOSING; | |
528 | spin_unlock_irqrestore(&rdma->req_lock, flags); | |
529 | rdma_disconnect(rdma->cm_id); | |
530 | } else | |
531 | spin_unlock_irqrestore(&rdma->req_lock, flags); | |
532 | return err; | |
533 | } | |
534 | ||
535 | static void rdma_close(struct p9_client *client) | |
536 | { | |
537 | struct p9_trans_rdma *rdma; | |
538 | ||
539 | if (!client) | |
540 | return; | |
541 | ||
542 | rdma = client->trans; | |
543 | if (!rdma) | |
544 | return; | |
545 | ||
546 | client->status = Disconnected; | |
547 | rdma_disconnect(rdma->cm_id); | |
548 | rdma_destroy_trans(rdma); | |
549 | } | |
550 | ||
551 | /** | |
552 | * alloc_rdma - Allocate and initialize the rdma transport structure | |
fc79d4b1 TT |
553 | * @opts: Mount options structure |
554 | */ | |
555 | static struct p9_trans_rdma *alloc_rdma(struct p9_rdma_opts *opts) | |
556 | { | |
557 | struct p9_trans_rdma *rdma; | |
558 | ||
559 | rdma = kzalloc(sizeof(struct p9_trans_rdma), GFP_KERNEL); | |
560 | if (!rdma) | |
561 | return NULL; | |
562 | ||
563 | rdma->sq_depth = opts->sq_depth; | |
564 | rdma->rq_depth = opts->rq_depth; | |
565 | rdma->timeout = opts->timeout; | |
566 | spin_lock_init(&rdma->req_lock); | |
567 | init_completion(&rdma->cm_done); | |
568 | sema_init(&rdma->sq_sem, rdma->sq_depth); | |
fd453d0e | 569 | sema_init(&rdma->rq_sem, rdma->rq_depth); |
1cff3306 | 570 | atomic_set(&rdma->excess_rc, 0); |
fc79d4b1 TT |
571 | |
572 | return rdma; | |
573 | } | |
574 | ||
fc79d4b1 TT |
575 | static int rdma_cancel(struct p9_client *client, struct p9_req_t *req) |
576 | { | |
931700d2 SD |
577 | /* Nothing to do here. |
578 | * We will take care of it (if we have to) in rdma_cancelled() | |
579 | */ | |
fc79d4b1 TT |
580 | return 1; |
581 | } | |
582 | ||
931700d2 SD |
583 | /* A request has been fully flushed without a reply. |
584 | * That means we have posted one buffer in excess. | |
585 | */ | |
586 | static int rdma_cancelled(struct p9_client *client, struct p9_req_t *req) | |
587 | { | |
588 | struct p9_trans_rdma *rdma = client->trans; | |
589 | atomic_inc(&rdma->excess_rc); | |
590 | return 0; | |
591 | } | |
592 | ||
f569d3ef DM |
593 | static int p9_rdma_bind_privport(struct p9_trans_rdma *rdma) |
594 | { | |
595 | struct sockaddr_in cl = { | |
596 | .sin_family = AF_INET, | |
597 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
598 | }; | |
599 | int port, err = -EINVAL; | |
600 | ||
601 | for (port = P9_DEF_MAX_RESVPORT; port >= P9_DEF_MIN_RESVPORT; port--) { | |
602 | cl.sin_port = htons((ushort)port); | |
603 | err = rdma_bind_addr(rdma->cm_id, (struct sockaddr *)&cl); | |
604 | if (err != -EADDRINUSE) | |
605 | break; | |
606 | } | |
607 | return err; | |
608 | } | |
609 | ||
fc79d4b1 TT |
610 | /** |
611 | * trans_create_rdma - Transport method for creating atransport instance | |
612 | * @client: client instance | |
613 | * @addr: IP address string | |
614 | * @args: Mount options string | |
615 | */ | |
616 | static int | |
617 | rdma_create_trans(struct p9_client *client, const char *addr, char *args) | |
618 | { | |
619 | int err; | |
620 | struct p9_rdma_opts opts; | |
621 | struct p9_trans_rdma *rdma; | |
622 | struct rdma_conn_param conn_param; | |
623 | struct ib_qp_init_attr qp_attr; | |
fc79d4b1 TT |
624 | |
625 | /* Parse the transport specific mount options */ | |
626 | err = parse_opts(args, &opts); | |
627 | if (err < 0) | |
628 | return err; | |
629 | ||
630 | /* Create and initialize the RDMA transport structure */ | |
631 | rdma = alloc_rdma(&opts); | |
632 | if (!rdma) | |
633 | return -ENOMEM; | |
634 | ||
635 | /* Create the RDMA CM ID */ | |
fa20105e GS |
636 | rdma->cm_id = rdma_create_id(&init_net, p9_cm_event_handler, client, |
637 | RDMA_PS_TCP, IB_QPT_RC); | |
fc79d4b1 TT |
638 | if (IS_ERR(rdma->cm_id)) |
639 | goto error; | |
640 | ||
517ac45a TT |
641 | /* Associate the client with the transport */ |
642 | client->trans = rdma; | |
643 | ||
f569d3ef DM |
644 | /* Bind to a privileged port if we need to */ |
645 | if (opts.privport) { | |
646 | err = p9_rdma_bind_privport(rdma); | |
647 | if (err < 0) { | |
648 | pr_err("%s (%d): problem binding to privport: %d\n", | |
649 | __func__, task_pid_nr(current), -err); | |
650 | goto error; | |
651 | } | |
652 | } | |
653 | ||
fc79d4b1 TT |
654 | /* Resolve the server's address */ |
655 | rdma->addr.sin_family = AF_INET; | |
656 | rdma->addr.sin_addr.s_addr = in_aton(addr); | |
657 | rdma->addr.sin_port = htons(opts.port); | |
658 | err = rdma_resolve_addr(rdma->cm_id, NULL, | |
659 | (struct sockaddr *)&rdma->addr, | |
660 | rdma->timeout); | |
661 | if (err) | |
662 | goto error; | |
663 | err = wait_for_completion_interruptible(&rdma->cm_done); | |
664 | if (err || (rdma->state != P9_RDMA_ADDR_RESOLVED)) | |
665 | goto error; | |
666 | ||
667 | /* Resolve the route to the server */ | |
668 | err = rdma_resolve_route(rdma->cm_id, rdma->timeout); | |
669 | if (err) | |
670 | goto error; | |
671 | err = wait_for_completion_interruptible(&rdma->cm_done); | |
672 | if (err || (rdma->state != P9_RDMA_ROUTE_RESOLVED)) | |
673 | goto error; | |
674 | ||
fc79d4b1 | 675 | /* Create the Completion Queue */ |
7cf20fc6 CH |
676 | rdma->cq = ib_alloc_cq(rdma->cm_id->device, client, |
677 | opts.sq_depth + opts.rq_depth + 1, | |
678 | 0, IB_POLL_SOFTIRQ); | |
fc79d4b1 TT |
679 | if (IS_ERR(rdma->cq)) |
680 | goto error; | |
fc79d4b1 TT |
681 | |
682 | /* Create the Protection Domain */ | |
683 | rdma->pd = ib_alloc_pd(rdma->cm_id->device); | |
684 | if (IS_ERR(rdma->pd)) | |
685 | goto error; | |
686 | ||
fc79d4b1 TT |
687 | /* Create the Queue Pair */ |
688 | memset(&qp_attr, 0, sizeof qp_attr); | |
689 | qp_attr.event_handler = qp_event_handler; | |
690 | qp_attr.qp_context = client; | |
691 | qp_attr.cap.max_send_wr = opts.sq_depth; | |
692 | qp_attr.cap.max_recv_wr = opts.rq_depth; | |
693 | qp_attr.cap.max_send_sge = P9_RDMA_SEND_SGE; | |
694 | qp_attr.cap.max_recv_sge = P9_RDMA_RECV_SGE; | |
695 | qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
696 | qp_attr.qp_type = IB_QPT_RC; | |
697 | qp_attr.send_cq = rdma->cq; | |
698 | qp_attr.recv_cq = rdma->cq; | |
699 | err = rdma_create_qp(rdma->cm_id, rdma->pd, &qp_attr); | |
700 | if (err) | |
701 | goto error; | |
702 | rdma->qp = rdma->cm_id->qp; | |
703 | ||
704 | /* Request a connection */ | |
705 | memset(&conn_param, 0, sizeof(conn_param)); | |
706 | conn_param.private_data = NULL; | |
707 | conn_param.private_data_len = 0; | |
708 | conn_param.responder_resources = P9_RDMA_IRD; | |
709 | conn_param.initiator_depth = P9_RDMA_ORD; | |
710 | err = rdma_connect(rdma->cm_id, &conn_param); | |
711 | if (err) | |
712 | goto error; | |
713 | err = wait_for_completion_interruptible(&rdma->cm_done); | |
714 | if (err || (rdma->state != P9_RDMA_CONNECTED)) | |
715 | goto error; | |
716 | ||
fc79d4b1 TT |
717 | client->status = Connected; |
718 | ||
719 | return 0; | |
720 | ||
721 | error: | |
722 | rdma_destroy_trans(rdma); | |
723 | return -ENOTCONN; | |
724 | } | |
725 | ||
726 | static struct p9_trans_module p9_rdma_trans = { | |
727 | .name = "rdma", | |
728 | .maxsize = P9_RDMA_MAXSIZE, | |
729 | .def = 0, | |
730 | .owner = THIS_MODULE, | |
731 | .create = rdma_create_trans, | |
732 | .close = rdma_close, | |
733 | .request = rdma_request, | |
734 | .cancel = rdma_cancel, | |
931700d2 | 735 | .cancelled = rdma_cancelled, |
fc79d4b1 TT |
736 | }; |
737 | ||
738 | /** | |
739 | * p9_trans_rdma_init - Register the 9P RDMA transport driver | |
740 | */ | |
741 | static int __init p9_trans_rdma_init(void) | |
742 | { | |
743 | v9fs_register_trans(&p9_rdma_trans); | |
744 | return 0; | |
745 | } | |
746 | ||
747 | static void __exit p9_trans_rdma_exit(void) | |
748 | { | |
749 | v9fs_unregister_trans(&p9_rdma_trans); | |
750 | } | |
751 | ||
752 | module_init(p9_trans_rdma_init); | |
753 | module_exit(p9_trans_rdma_exit); | |
754 | ||
755 | MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>"); | |
756 | MODULE_DESCRIPTION("RDMA Transport for 9P"); | |
757 | MODULE_LICENSE("Dual BSD/GPL"); |