Commit | Line | Data |
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1f327613 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
fc79d4b1 TT |
2 | /* |
3 | * linux/fs/9p/trans_rdma.c | |
4 | * | |
5 | * RDMA transport layer based on the trans_fd.c implementation. | |
6 | * | |
7 | * Copyright (C) 2008 by Tom Tucker <tom@opengridcomputing.com> | |
8 | * Copyright (C) 2006 by Russ Cox <rsc@swtch.com> | |
9 | * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net> | |
10 | * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> | |
11 | * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com> | |
fc79d4b1 TT |
12 | */ |
13 | ||
5d385153 JP |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
15 | ||
fc79d4b1 TT |
16 | #include <linux/in.h> |
17 | #include <linux/module.h> | |
18 | #include <linux/net.h> | |
19 | #include <linux/ipv6.h> | |
20 | #include <linux/kthread.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/un.h> | |
24 | #include <linux/uaccess.h> | |
25 | #include <linux/inet.h> | |
26 | #include <linux/idr.h> | |
27 | #include <linux/file.h> | |
28 | #include <linux/parser.h> | |
29 | #include <linux/semaphore.h> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
c4fac910 | 31 | #include <linux/seq_file.h> |
fc79d4b1 TT |
32 | #include <net/9p/9p.h> |
33 | #include <net/9p/client.h> | |
34 | #include <net/9p/transport.h> | |
35 | #include <rdma/ib_verbs.h> | |
36 | #include <rdma/rdma_cm.h> | |
fc79d4b1 TT |
37 | |
38 | #define P9_PORT 5640 | |
39 | #define P9_RDMA_SQ_DEPTH 32 | |
40 | #define P9_RDMA_RQ_DEPTH 32 | |
41 | #define P9_RDMA_SEND_SGE 4 | |
42 | #define P9_RDMA_RECV_SGE 4 | |
43 | #define P9_RDMA_IRD 0 | |
44 | #define P9_RDMA_ORD 0 | |
45 | #define P9_RDMA_TIMEOUT 30000 /* 30 seconds */ | |
3fcc62f4 | 46 | #define P9_RDMA_MAXSIZE (1024*1024) /* 1MB */ |
fc79d4b1 | 47 | |
fc79d4b1 TT |
48 | /** |
49 | * struct p9_trans_rdma - RDMA transport instance | |
50 | * | |
51 | * @state: tracks the transport state machine for connection setup and tear down | |
52 | * @cm_id: The RDMA CM ID | |
53 | * @pd: Protection Domain pointer | |
54 | * @qp: Queue Pair pointer | |
55 | * @cq: Completion Queue pointer | |
fc79d4b1 | 56 | * @timeout: Number of uSecs to wait for connection management events |
c4fac910 DH |
57 | * @privport: Whether a privileged port may be used |
58 | * @port: The port to use | |
fc79d4b1 TT |
59 | * @sq_depth: The depth of the Send Queue |
60 | * @sq_sem: Semaphore for the SQ | |
61 | * @rq_depth: The depth of the Receive Queue. | |
fd453d0e | 62 | * @rq_sem: Semaphore for the RQ |
1cff3306 SD |
63 | * @excess_rc : Amount of posted Receive Contexts without a pending request. |
64 | * See rdma_request() | |
fc79d4b1 TT |
65 | * @addr: The remote peer's address |
66 | * @req_lock: Protects the active request list | |
fc79d4b1 TT |
67 | * @cm_done: Completion event for connection management tracking |
68 | */ | |
69 | struct p9_trans_rdma { | |
70 | enum { | |
71 | P9_RDMA_INIT, | |
72 | P9_RDMA_ADDR_RESOLVED, | |
73 | P9_RDMA_ROUTE_RESOLVED, | |
74 | P9_RDMA_CONNECTED, | |
75 | P9_RDMA_FLUSHING, | |
76 | P9_RDMA_CLOSING, | |
77 | P9_RDMA_CLOSED, | |
78 | } state; | |
79 | struct rdma_cm_id *cm_id; | |
80 | struct ib_pd *pd; | |
81 | struct ib_qp *qp; | |
82 | struct ib_cq *cq; | |
fc79d4b1 | 83 | long timeout; |
c4fac910 DH |
84 | bool privport; |
85 | u16 port; | |
fc79d4b1 TT |
86 | int sq_depth; |
87 | struct semaphore sq_sem; | |
88 | int rq_depth; | |
fd453d0e | 89 | struct semaphore rq_sem; |
1cff3306 | 90 | atomic_t excess_rc; |
fc79d4b1 TT |
91 | struct sockaddr_in addr; |
92 | spinlock_t req_lock; | |
93 | ||
94 | struct completion cm_done; | |
95 | }; | |
96 | ||
97 | /** | |
98 | * p9_rdma_context - Keeps track of in-process WR | |
99 | * | |
fc79d4b1 TT |
100 | * @busa: Bus address to unmap when the WR completes |
101 | * @req: Keeps track of requests (send) | |
102 | * @rc: Keepts track of replies (receive) | |
103 | */ | |
104 | struct p9_rdma_req; | |
105 | struct p9_rdma_context { | |
7cf20fc6 | 106 | struct ib_cqe cqe; |
fc79d4b1 TT |
107 | dma_addr_t busa; |
108 | union { | |
109 | struct p9_req_t *req; | |
523adb6c | 110 | struct p9_fcall rc; |
fc79d4b1 TT |
111 | }; |
112 | }; | |
113 | ||
114 | /** | |
115 | * p9_rdma_opts - Collection of mount options | |
116 | * @port: port of connection | |
117 | * @sq_depth: The requested depth of the SQ. This really doesn't need | |
118 | * to be any deeper than the number of threads used in the client | |
119 | * @rq_depth: The depth of the RQ. Should be greater than or equal to SQ depth | |
120 | * @timeout: Time to wait in msecs for CM events | |
121 | */ | |
122 | struct p9_rdma_opts { | |
123 | short port; | |
c4fac910 | 124 | bool privport; |
fc79d4b1 TT |
125 | int sq_depth; |
126 | int rq_depth; | |
127 | long timeout; | |
128 | }; | |
129 | ||
130 | /* | |
131 | * Option Parsing (code inspired by NFS code) | |
132 | */ | |
133 | enum { | |
134 | /* Options that take integer arguments */ | |
f569d3ef DM |
135 | Opt_port, Opt_rq_depth, Opt_sq_depth, Opt_timeout, |
136 | /* Options that take no argument */ | |
137 | Opt_privport, | |
138 | Opt_err, | |
fc79d4b1 TT |
139 | }; |
140 | ||
141 | static match_table_t tokens = { | |
142 | {Opt_port, "port=%u"}, | |
143 | {Opt_sq_depth, "sq=%u"}, | |
144 | {Opt_rq_depth, "rq=%u"}, | |
145 | {Opt_timeout, "timeout=%u"}, | |
f569d3ef | 146 | {Opt_privport, "privport"}, |
fc79d4b1 TT |
147 | {Opt_err, NULL}, |
148 | }; | |
149 | ||
c4fac910 DH |
150 | static int p9_rdma_show_options(struct seq_file *m, struct p9_client *clnt) |
151 | { | |
152 | struct p9_trans_rdma *rdma = clnt->trans; | |
153 | ||
154 | if (rdma->port != P9_PORT) | |
155 | seq_printf(m, ",port=%u", rdma->port); | |
156 | if (rdma->sq_depth != P9_RDMA_SQ_DEPTH) | |
157 | seq_printf(m, ",sq=%u", rdma->sq_depth); | |
158 | if (rdma->rq_depth != P9_RDMA_RQ_DEPTH) | |
159 | seq_printf(m, ",rq=%u", rdma->rq_depth); | |
160 | if (rdma->timeout != P9_RDMA_TIMEOUT) | |
161 | seq_printf(m, ",timeout=%lu", rdma->timeout); | |
162 | if (rdma->privport) | |
163 | seq_puts(m, ",privport"); | |
164 | return 0; | |
165 | } | |
166 | ||
fc79d4b1 | 167 | /** |
0e15597e AK |
168 | * parse_opts - parse mount options into rdma options structure |
169 | * @params: options string passed from mount | |
170 | * @opts: rdma transport-specific structure to parse options into | |
fc79d4b1 TT |
171 | * |
172 | * Returns 0 upon success, -ERRNO upon failure | |
173 | */ | |
174 | static int parse_opts(char *params, struct p9_rdma_opts *opts) | |
175 | { | |
176 | char *p; | |
177 | substring_t args[MAX_OPT_ARGS]; | |
178 | int option; | |
d8c8a9e3 | 179 | char *options, *tmp_options; |
fc79d4b1 TT |
180 | |
181 | opts->port = P9_PORT; | |
182 | opts->sq_depth = P9_RDMA_SQ_DEPTH; | |
183 | opts->rq_depth = P9_RDMA_RQ_DEPTH; | |
184 | opts->timeout = P9_RDMA_TIMEOUT; | |
c4fac910 | 185 | opts->privport = false; |
fc79d4b1 TT |
186 | |
187 | if (!params) | |
188 | return 0; | |
189 | ||
d8c8a9e3 EVH |
190 | tmp_options = kstrdup(params, GFP_KERNEL); |
191 | if (!tmp_options) { | |
5d385153 JP |
192 | p9_debug(P9_DEBUG_ERROR, |
193 | "failed to allocate copy of option string\n"); | |
fc79d4b1 TT |
194 | return -ENOMEM; |
195 | } | |
d8c8a9e3 | 196 | options = tmp_options; |
fc79d4b1 TT |
197 | |
198 | while ((p = strsep(&options, ",")) != NULL) { | |
199 | int token; | |
200 | int r; | |
201 | if (!*p) | |
202 | continue; | |
203 | token = match_token(p, tokens, args); | |
f569d3ef DM |
204 | if ((token != Opt_err) && (token != Opt_privport)) { |
205 | r = match_int(&args[0], &option); | |
206 | if (r < 0) { | |
207 | p9_debug(P9_DEBUG_ERROR, | |
208 | "integer field, but no integer?\n"); | |
209 | continue; | |
210 | } | |
fc79d4b1 TT |
211 | } |
212 | switch (token) { | |
213 | case Opt_port: | |
214 | opts->port = option; | |
215 | break; | |
216 | case Opt_sq_depth: | |
217 | opts->sq_depth = option; | |
218 | break; | |
219 | case Opt_rq_depth: | |
220 | opts->rq_depth = option; | |
221 | break; | |
222 | case Opt_timeout: | |
223 | opts->timeout = option; | |
224 | break; | |
f569d3ef | 225 | case Opt_privport: |
c4fac910 | 226 | opts->privport = true; |
f569d3ef | 227 | break; |
fc79d4b1 TT |
228 | default: |
229 | continue; | |
230 | } | |
231 | } | |
232 | /* RQ must be at least as large as the SQ */ | |
233 | opts->rq_depth = max(opts->rq_depth, opts->sq_depth); | |
d8c8a9e3 | 234 | kfree(tmp_options); |
fc79d4b1 TT |
235 | return 0; |
236 | } | |
237 | ||
238 | static int | |
239 | p9_cm_event_handler(struct rdma_cm_id *id, struct rdma_cm_event *event) | |
240 | { | |
241 | struct p9_client *c = id->context; | |
242 | struct p9_trans_rdma *rdma = c->trans; | |
243 | switch (event->event) { | |
244 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
245 | BUG_ON(rdma->state != P9_RDMA_INIT); | |
246 | rdma->state = P9_RDMA_ADDR_RESOLVED; | |
247 | break; | |
248 | ||
249 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
250 | BUG_ON(rdma->state != P9_RDMA_ADDR_RESOLVED); | |
251 | rdma->state = P9_RDMA_ROUTE_RESOLVED; | |
252 | break; | |
253 | ||
254 | case RDMA_CM_EVENT_ESTABLISHED: | |
255 | BUG_ON(rdma->state != P9_RDMA_ROUTE_RESOLVED); | |
256 | rdma->state = P9_RDMA_CONNECTED; | |
257 | break; | |
258 | ||
259 | case RDMA_CM_EVENT_DISCONNECTED: | |
260 | if (rdma) | |
261 | rdma->state = P9_RDMA_CLOSED; | |
473c7dd1 | 262 | c->status = Disconnected; |
fc79d4b1 TT |
263 | break; |
264 | ||
265 | case RDMA_CM_EVENT_TIMEWAIT_EXIT: | |
266 | break; | |
267 | ||
268 | case RDMA_CM_EVENT_ADDR_CHANGE: | |
269 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
270 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
271 | case RDMA_CM_EVENT_MULTICAST_JOIN: | |
272 | case RDMA_CM_EVENT_MULTICAST_ERROR: | |
273 | case RDMA_CM_EVENT_REJECTED: | |
274 | case RDMA_CM_EVENT_CONNECT_REQUEST: | |
275 | case RDMA_CM_EVENT_CONNECT_RESPONSE: | |
276 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
277 | case RDMA_CM_EVENT_ADDR_ERROR: | |
278 | case RDMA_CM_EVENT_UNREACHABLE: | |
279 | c->status = Disconnected; | |
280 | rdma_disconnect(rdma->cm_id); | |
281 | break; | |
282 | default: | |
283 | BUG(); | |
284 | } | |
285 | complete(&rdma->cm_done); | |
286 | return 0; | |
287 | } | |
288 | ||
289 | static void | |
7cf20fc6 | 290 | recv_done(struct ib_cq *cq, struct ib_wc *wc) |
fc79d4b1 | 291 | { |
7cf20fc6 CH |
292 | struct p9_client *client = cq->cq_context; |
293 | struct p9_trans_rdma *rdma = client->trans; | |
294 | struct p9_rdma_context *c = | |
295 | container_of(wc->wr_cqe, struct p9_rdma_context, cqe); | |
fc79d4b1 TT |
296 | struct p9_req_t *req; |
297 | int err = 0; | |
298 | int16_t tag; | |
299 | ||
300 | req = NULL; | |
301 | ib_dma_unmap_single(rdma->cm_id->device, c->busa, client->msize, | |
302 | DMA_FROM_DEVICE); | |
303 | ||
7cf20fc6 | 304 | if (wc->status != IB_WC_SUCCESS) |
fc79d4b1 TT |
305 | goto err_out; |
306 | ||
523adb6c DM |
307 | c->rc.size = wc->byte_len; |
308 | err = p9_parse_header(&c->rc, NULL, NULL, &tag, 1); | |
fc79d4b1 TT |
309 | if (err) |
310 | goto err_out; | |
311 | ||
312 | req = p9_tag_lookup(client, tag); | |
313 | if (!req) | |
314 | goto err_out; | |
315 | ||
47229ff8 SD |
316 | /* Check that we have not yet received a reply for this request. |
317 | */ | |
523adb6c | 318 | if (unlikely(req->rc.sdata)) { |
47229ff8 SD |
319 | pr_err("Duplicate reply for request %d", tag); |
320 | goto err_out; | |
321 | } | |
322 | ||
523adb6c DM |
323 | req->rc.size = c->rc.size; |
324 | req->rc.sdata = c->rc.sdata; | |
2b6e72ed | 325 | p9_client_cb(client, req, REQ_STATUS_RCVD); |
fc79d4b1 | 326 | |
7cf20fc6 CH |
327 | out: |
328 | up(&rdma->rq_sem); | |
329 | kfree(c); | |
fc79d4b1 TT |
330 | return; |
331 | ||
332 | err_out: | |
7cf20fc6 CH |
333 | p9_debug(P9_DEBUG_ERROR, "req %p err %d status %d\n", |
334 | req, err, wc->status); | |
fc79d4b1 TT |
335 | rdma->state = P9_RDMA_FLUSHING; |
336 | client->status = Disconnected; | |
7cf20fc6 | 337 | goto out; |
fc79d4b1 TT |
338 | } |
339 | ||
340 | static void | |
7cf20fc6 | 341 | send_done(struct ib_cq *cq, struct ib_wc *wc) |
fc79d4b1 | 342 | { |
7cf20fc6 CH |
343 | struct p9_client *client = cq->cq_context; |
344 | struct p9_trans_rdma *rdma = client->trans; | |
345 | struct p9_rdma_context *c = | |
346 | container_of(wc->wr_cqe, struct p9_rdma_context, cqe); | |
347 | ||
fc79d4b1 | 348 | ib_dma_unmap_single(rdma->cm_id->device, |
523adb6c | 349 | c->busa, c->req->tc.size, |
fc79d4b1 | 350 | DMA_TO_DEVICE); |
7cf20fc6 | 351 | up(&rdma->sq_sem); |
728356de | 352 | p9_req_put(c->req); |
7cf20fc6 | 353 | kfree(c); |
fc79d4b1 TT |
354 | } |
355 | ||
356 | static void qp_event_handler(struct ib_event *event, void *context) | |
357 | { | |
5d385153 JP |
358 | p9_debug(P9_DEBUG_ERROR, "QP event %d context %p\n", |
359 | event->event, context); | |
fc79d4b1 TT |
360 | } |
361 | ||
fc79d4b1 TT |
362 | static void rdma_destroy_trans(struct p9_trans_rdma *rdma) |
363 | { | |
364 | if (!rdma) | |
365 | return; | |
366 | ||
fc79d4b1 TT |
367 | if (rdma->qp && !IS_ERR(rdma->qp)) |
368 | ib_destroy_qp(rdma->qp); | |
369 | ||
370 | if (rdma->pd && !IS_ERR(rdma->pd)) | |
371 | ib_dealloc_pd(rdma->pd); | |
372 | ||
373 | if (rdma->cq && !IS_ERR(rdma->cq)) | |
7cf20fc6 | 374 | ib_free_cq(rdma->cq); |
fc79d4b1 TT |
375 | |
376 | if (rdma->cm_id && !IS_ERR(rdma->cm_id)) | |
377 | rdma_destroy_id(rdma->cm_id); | |
378 | ||
379 | kfree(rdma); | |
380 | } | |
381 | ||
382 | static int | |
383 | post_recv(struct p9_client *client, struct p9_rdma_context *c) | |
384 | { | |
385 | struct p9_trans_rdma *rdma = client->trans; | |
72bc4d37 | 386 | struct ib_recv_wr wr; |
fc79d4b1 TT |
387 | struct ib_sge sge; |
388 | ||
389 | c->busa = ib_dma_map_single(rdma->cm_id->device, | |
523adb6c | 390 | c->rc.sdata, client->msize, |
fc79d4b1 TT |
391 | DMA_FROM_DEVICE); |
392 | if (ib_dma_mapping_error(rdma->cm_id->device, c->busa)) | |
393 | goto error; | |
394 | ||
7cf20fc6 CH |
395 | c->cqe.done = recv_done; |
396 | ||
fc79d4b1 TT |
397 | sge.addr = c->busa; |
398 | sge.length = client->msize; | |
2f31fa88 | 399 | sge.lkey = rdma->pd->local_dma_lkey; |
fc79d4b1 TT |
400 | |
401 | wr.next = NULL; | |
7cf20fc6 | 402 | wr.wr_cqe = &c->cqe; |
fc79d4b1 TT |
403 | wr.sg_list = &sge; |
404 | wr.num_sge = 1; | |
72bc4d37 | 405 | return ib_post_recv(rdma->qp, &wr, NULL); |
fc79d4b1 TT |
406 | |
407 | error: | |
5d385153 | 408 | p9_debug(P9_DEBUG_ERROR, "EIO\n"); |
fc79d4b1 TT |
409 | return -EIO; |
410 | } | |
411 | ||
412 | static int rdma_request(struct p9_client *client, struct p9_req_t *req) | |
413 | { | |
414 | struct p9_trans_rdma *rdma = client->trans; | |
72bc4d37 | 415 | struct ib_send_wr wr; |
fc79d4b1 TT |
416 | struct ib_sge sge; |
417 | int err = 0; | |
418 | unsigned long flags; | |
419 | struct p9_rdma_context *c = NULL; | |
420 | struct p9_rdma_context *rpl_context = NULL; | |
421 | ||
1cff3306 SD |
422 | /* When an error occurs between posting the recv and the send, |
423 | * there will be a receive context posted without a pending request. | |
424 | * Since there is no way to "un-post" it, we remember it and skip | |
425 | * post_recv() for the next request. | |
426 | * So here, | |
427 | * see if we are this `next request' and need to absorb an excess rc. | |
428 | * If yes, then drop and free our own, and do not recv_post(). | |
429 | **/ | |
430 | if (unlikely(atomic_read(&rdma->excess_rc) > 0)) { | |
431 | if ((atomic_sub_return(1, &rdma->excess_rc) >= 0)) { | |
523adb6c DM |
432 | /* Got one! */ |
433 | p9_fcall_fini(&req->rc); | |
434 | req->rc.sdata = NULL; | |
1cff3306 SD |
435 | goto dont_need_post_recv; |
436 | } else { | |
437 | /* We raced and lost. */ | |
438 | atomic_inc(&rdma->excess_rc); | |
439 | } | |
440 | } | |
441 | ||
fc79d4b1 | 442 | /* Allocate an fcall for the reply */ |
eeff66ef | 443 | rpl_context = kmalloc(sizeof *rpl_context, GFP_NOFS); |
1d6400c7 DB |
444 | if (!rpl_context) { |
445 | err = -ENOMEM; | |
2f52d07c | 446 | goto recv_error; |
1d6400c7 | 447 | } |
523adb6c | 448 | rpl_context->rc.sdata = req->rc.sdata; |
fc79d4b1 TT |
449 | |
450 | /* | |
451 | * Post a receive buffer for this request. We need to ensure | |
452 | * there is a reply buffer available for every outstanding | |
453 | * request. A flushed request can result in no reply for an | |
454 | * outstanding request, so we must keep a count to avoid | |
455 | * overflowing the RQ. | |
456 | */ | |
2f52d07c SD |
457 | if (down_interruptible(&rdma->rq_sem)) { |
458 | err = -EINTR; | |
459 | goto recv_error; | |
460 | } | |
fd453d0e SD |
461 | |
462 | err = post_recv(client, rpl_context); | |
463 | if (err) { | |
8b894adb | 464 | p9_debug(P9_DEBUG_ERROR, "POST RECV failed: %d\n", err); |
2f52d07c | 465 | goto recv_error; |
fd453d0e | 466 | } |
fc79d4b1 | 467 | /* remove posted receive buffer from request structure */ |
523adb6c | 468 | req->rc.sdata = NULL; |
fc79d4b1 | 469 | |
1cff3306 | 470 | dont_need_post_recv: |
fc79d4b1 | 471 | /* Post the request */ |
eeff66ef | 472 | c = kmalloc(sizeof *c, GFP_NOFS); |
1d6400c7 DB |
473 | if (!c) { |
474 | err = -ENOMEM; | |
2f52d07c | 475 | goto send_error; |
1d6400c7 | 476 | } |
fc79d4b1 TT |
477 | c->req = req; |
478 | ||
479 | c->busa = ib_dma_map_single(rdma->cm_id->device, | |
523adb6c | 480 | c->req->tc.sdata, c->req->tc.size, |
fc79d4b1 | 481 | DMA_TO_DEVICE); |
2f52d07c SD |
482 | if (ib_dma_mapping_error(rdma->cm_id->device, c->busa)) { |
483 | err = -EIO; | |
484 | goto send_error; | |
485 | } | |
fc79d4b1 | 486 | |
7cf20fc6 CH |
487 | c->cqe.done = send_done; |
488 | ||
fc79d4b1 | 489 | sge.addr = c->busa; |
523adb6c | 490 | sge.length = c->req->tc.size; |
2f31fa88 | 491 | sge.lkey = rdma->pd->local_dma_lkey; |
fc79d4b1 TT |
492 | |
493 | wr.next = NULL; | |
7cf20fc6 | 494 | wr.wr_cqe = &c->cqe; |
fc79d4b1 TT |
495 | wr.opcode = IB_WR_SEND; |
496 | wr.send_flags = IB_SEND_SIGNALED; | |
497 | wr.sg_list = &sge; | |
498 | wr.num_sge = 1; | |
499 | ||
2f52d07c SD |
500 | if (down_interruptible(&rdma->sq_sem)) { |
501 | err = -EINTR; | |
502 | goto send_error; | |
503 | } | |
504 | ||
3f9d5b8d SD |
505 | /* Mark request as `sent' *before* we actually send it, |
506 | * because doing if after could erase the REQ_STATUS_RCVD | |
507 | * status in case of a very fast reply. | |
508 | */ | |
509 | req->status = REQ_STATUS_SENT; | |
72bc4d37 | 510 | err = ib_post_send(rdma->qp, &wr, NULL); |
2f52d07c SD |
511 | if (err) |
512 | goto send_error; | |
fc79d4b1 | 513 | |
2f52d07c SD |
514 | /* Success */ |
515 | return 0; | |
fc79d4b1 | 516 | |
2f52d07c SD |
517 | /* Handle errors that happened during or while preparing the send: */ |
518 | send_error: | |
3f9d5b8d | 519 | req->status = REQ_STATUS_ERROR; |
1d6400c7 | 520 | kfree(c); |
2f52d07c | 521 | p9_debug(P9_DEBUG_ERROR, "Error %d in rdma_request()\n", err); |
1cff3306 SD |
522 | |
523 | /* Ach. | |
524 | * We did recv_post(), but not send. We have one recv_post in excess. | |
525 | */ | |
526 | atomic_inc(&rdma->excess_rc); | |
2f52d07c SD |
527 | return err; |
528 | ||
529 | /* Handle errors that happened during or while preparing post_recv(): */ | |
530 | recv_error: | |
1d6400c7 | 531 | kfree(rpl_context); |
fc79d4b1 | 532 | spin_lock_irqsave(&rdma->req_lock, flags); |
8b894adb | 533 | if (err != -EINTR && rdma->state < P9_RDMA_CLOSING) { |
fc79d4b1 TT |
534 | rdma->state = P9_RDMA_CLOSING; |
535 | spin_unlock_irqrestore(&rdma->req_lock, flags); | |
536 | rdma_disconnect(rdma->cm_id); | |
537 | } else | |
538 | spin_unlock_irqrestore(&rdma->req_lock, flags); | |
539 | return err; | |
540 | } | |
541 | ||
542 | static void rdma_close(struct p9_client *client) | |
543 | { | |
544 | struct p9_trans_rdma *rdma; | |
545 | ||
546 | if (!client) | |
547 | return; | |
548 | ||
549 | rdma = client->trans; | |
550 | if (!rdma) | |
551 | return; | |
552 | ||
553 | client->status = Disconnected; | |
554 | rdma_disconnect(rdma->cm_id); | |
555 | rdma_destroy_trans(rdma); | |
556 | } | |
557 | ||
558 | /** | |
559 | * alloc_rdma - Allocate and initialize the rdma transport structure | |
fc79d4b1 TT |
560 | * @opts: Mount options structure |
561 | */ | |
562 | static struct p9_trans_rdma *alloc_rdma(struct p9_rdma_opts *opts) | |
563 | { | |
564 | struct p9_trans_rdma *rdma; | |
565 | ||
566 | rdma = kzalloc(sizeof(struct p9_trans_rdma), GFP_KERNEL); | |
567 | if (!rdma) | |
568 | return NULL; | |
569 | ||
c4fac910 DH |
570 | rdma->port = opts->port; |
571 | rdma->privport = opts->privport; | |
fc79d4b1 TT |
572 | rdma->sq_depth = opts->sq_depth; |
573 | rdma->rq_depth = opts->rq_depth; | |
574 | rdma->timeout = opts->timeout; | |
575 | spin_lock_init(&rdma->req_lock); | |
576 | init_completion(&rdma->cm_done); | |
577 | sema_init(&rdma->sq_sem, rdma->sq_depth); | |
fd453d0e | 578 | sema_init(&rdma->rq_sem, rdma->rq_depth); |
1cff3306 | 579 | atomic_set(&rdma->excess_rc, 0); |
fc79d4b1 TT |
580 | |
581 | return rdma; | |
582 | } | |
583 | ||
fc79d4b1 TT |
584 | static int rdma_cancel(struct p9_client *client, struct p9_req_t *req) |
585 | { | |
931700d2 SD |
586 | /* Nothing to do here. |
587 | * We will take care of it (if we have to) in rdma_cancelled() | |
588 | */ | |
fc79d4b1 TT |
589 | return 1; |
590 | } | |
591 | ||
931700d2 SD |
592 | /* A request has been fully flushed without a reply. |
593 | * That means we have posted one buffer in excess. | |
594 | */ | |
595 | static int rdma_cancelled(struct p9_client *client, struct p9_req_t *req) | |
596 | { | |
597 | struct p9_trans_rdma *rdma = client->trans; | |
598 | atomic_inc(&rdma->excess_rc); | |
599 | return 0; | |
600 | } | |
601 | ||
f569d3ef DM |
602 | static int p9_rdma_bind_privport(struct p9_trans_rdma *rdma) |
603 | { | |
604 | struct sockaddr_in cl = { | |
605 | .sin_family = AF_INET, | |
606 | .sin_addr.s_addr = htonl(INADDR_ANY), | |
607 | }; | |
608 | int port, err = -EINVAL; | |
609 | ||
610 | for (port = P9_DEF_MAX_RESVPORT; port >= P9_DEF_MIN_RESVPORT; port--) { | |
611 | cl.sin_port = htons((ushort)port); | |
612 | err = rdma_bind_addr(rdma->cm_id, (struct sockaddr *)&cl); | |
613 | if (err != -EADDRINUSE) | |
614 | break; | |
615 | } | |
616 | return err; | |
617 | } | |
618 | ||
fc79d4b1 | 619 | /** |
4a026da9 | 620 | * rdma_create_trans - Transport method for creating a transport instance |
fc79d4b1 TT |
621 | * @client: client instance |
622 | * @addr: IP address string | |
623 | * @args: Mount options string | |
624 | */ | |
625 | static int | |
626 | rdma_create_trans(struct p9_client *client, const char *addr, char *args) | |
627 | { | |
628 | int err; | |
629 | struct p9_rdma_opts opts; | |
630 | struct p9_trans_rdma *rdma; | |
631 | struct rdma_conn_param conn_param; | |
632 | struct ib_qp_init_attr qp_attr; | |
fc79d4b1 | 633 | |
10aa1452 TB |
634 | if (addr == NULL) |
635 | return -EINVAL; | |
636 | ||
fc79d4b1 TT |
637 | /* Parse the transport specific mount options */ |
638 | err = parse_opts(args, &opts); | |
639 | if (err < 0) | |
640 | return err; | |
641 | ||
642 | /* Create and initialize the RDMA transport structure */ | |
643 | rdma = alloc_rdma(&opts); | |
644 | if (!rdma) | |
645 | return -ENOMEM; | |
646 | ||
647 | /* Create the RDMA CM ID */ | |
fa20105e GS |
648 | rdma->cm_id = rdma_create_id(&init_net, p9_cm_event_handler, client, |
649 | RDMA_PS_TCP, IB_QPT_RC); | |
fc79d4b1 TT |
650 | if (IS_ERR(rdma->cm_id)) |
651 | goto error; | |
652 | ||
517ac45a TT |
653 | /* Associate the client with the transport */ |
654 | client->trans = rdma; | |
655 | ||
f569d3ef DM |
656 | /* Bind to a privileged port if we need to */ |
657 | if (opts.privport) { | |
658 | err = p9_rdma_bind_privport(rdma); | |
659 | if (err < 0) { | |
660 | pr_err("%s (%d): problem binding to privport: %d\n", | |
661 | __func__, task_pid_nr(current), -err); | |
662 | goto error; | |
663 | } | |
664 | } | |
665 | ||
fc79d4b1 TT |
666 | /* Resolve the server's address */ |
667 | rdma->addr.sin_family = AF_INET; | |
668 | rdma->addr.sin_addr.s_addr = in_aton(addr); | |
669 | rdma->addr.sin_port = htons(opts.port); | |
670 | err = rdma_resolve_addr(rdma->cm_id, NULL, | |
671 | (struct sockaddr *)&rdma->addr, | |
672 | rdma->timeout); | |
673 | if (err) | |
674 | goto error; | |
675 | err = wait_for_completion_interruptible(&rdma->cm_done); | |
676 | if (err || (rdma->state != P9_RDMA_ADDR_RESOLVED)) | |
677 | goto error; | |
678 | ||
679 | /* Resolve the route to the server */ | |
680 | err = rdma_resolve_route(rdma->cm_id, rdma->timeout); | |
681 | if (err) | |
682 | goto error; | |
683 | err = wait_for_completion_interruptible(&rdma->cm_done); | |
684 | if (err || (rdma->state != P9_RDMA_ROUTE_RESOLVED)) | |
685 | goto error; | |
686 | ||
fc79d4b1 | 687 | /* Create the Completion Queue */ |
20cf4e02 CL |
688 | rdma->cq = ib_alloc_cq_any(rdma->cm_id->device, client, |
689 | opts.sq_depth + opts.rq_depth + 1, | |
690 | IB_POLL_SOFTIRQ); | |
fc79d4b1 TT |
691 | if (IS_ERR(rdma->cq)) |
692 | goto error; | |
fc79d4b1 TT |
693 | |
694 | /* Create the Protection Domain */ | |
ed082d36 | 695 | rdma->pd = ib_alloc_pd(rdma->cm_id->device, 0); |
fc79d4b1 TT |
696 | if (IS_ERR(rdma->pd)) |
697 | goto error; | |
698 | ||
fc79d4b1 TT |
699 | /* Create the Queue Pair */ |
700 | memset(&qp_attr, 0, sizeof qp_attr); | |
701 | qp_attr.event_handler = qp_event_handler; | |
702 | qp_attr.qp_context = client; | |
703 | qp_attr.cap.max_send_wr = opts.sq_depth; | |
704 | qp_attr.cap.max_recv_wr = opts.rq_depth; | |
705 | qp_attr.cap.max_send_sge = P9_RDMA_SEND_SGE; | |
706 | qp_attr.cap.max_recv_sge = P9_RDMA_RECV_SGE; | |
707 | qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
708 | qp_attr.qp_type = IB_QPT_RC; | |
709 | qp_attr.send_cq = rdma->cq; | |
710 | qp_attr.recv_cq = rdma->cq; | |
711 | err = rdma_create_qp(rdma->cm_id, rdma->pd, &qp_attr); | |
712 | if (err) | |
713 | goto error; | |
714 | rdma->qp = rdma->cm_id->qp; | |
715 | ||
716 | /* Request a connection */ | |
717 | memset(&conn_param, 0, sizeof(conn_param)); | |
718 | conn_param.private_data = NULL; | |
719 | conn_param.private_data_len = 0; | |
720 | conn_param.responder_resources = P9_RDMA_IRD; | |
721 | conn_param.initiator_depth = P9_RDMA_ORD; | |
722 | err = rdma_connect(rdma->cm_id, &conn_param); | |
723 | if (err) | |
724 | goto error; | |
725 | err = wait_for_completion_interruptible(&rdma->cm_done); | |
726 | if (err || (rdma->state != P9_RDMA_CONNECTED)) | |
727 | goto error; | |
728 | ||
fc79d4b1 TT |
729 | client->status = Connected; |
730 | ||
731 | return 0; | |
732 | ||
733 | error: | |
734 | rdma_destroy_trans(rdma); | |
735 | return -ENOTCONN; | |
736 | } | |
737 | ||
738 | static struct p9_trans_module p9_rdma_trans = { | |
739 | .name = "rdma", | |
740 | .maxsize = P9_RDMA_MAXSIZE, | |
741 | .def = 0, | |
742 | .owner = THIS_MODULE, | |
743 | .create = rdma_create_trans, | |
744 | .close = rdma_close, | |
745 | .request = rdma_request, | |
746 | .cancel = rdma_cancel, | |
931700d2 | 747 | .cancelled = rdma_cancelled, |
c4fac910 | 748 | .show_options = p9_rdma_show_options, |
fc79d4b1 TT |
749 | }; |
750 | ||
751 | /** | |
752 | * p9_trans_rdma_init - Register the 9P RDMA transport driver | |
753 | */ | |
754 | static int __init p9_trans_rdma_init(void) | |
755 | { | |
756 | v9fs_register_trans(&p9_rdma_trans); | |
757 | return 0; | |
758 | } | |
759 | ||
760 | static void __exit p9_trans_rdma_exit(void) | |
761 | { | |
762 | v9fs_unregister_trans(&p9_rdma_trans); | |
763 | } | |
764 | ||
765 | module_init(p9_trans_rdma_init); | |
766 | module_exit(p9_trans_rdma_exit); | |
767 | ||
768 | MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>"); | |
769 | MODULE_DESCRIPTION("RDMA Transport for 9P"); | |
770 | MODULE_LICENSE("Dual BSD/GPL"); |