Root/
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 | |
29 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
30 | |
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> |
45 | #include <linux/slab.h> |
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> |
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 */ |
60 | #define P9_RDMA_MAXSIZE (1024*1024) /* 1MB */ |
61 | |
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 |
70 | * @dm_mr: DMA Memory Region pointer |
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. |
76 | * @rq_sem: Semaphore for the RQ |
77 | * @excess_rc : Amount of posted Receive Contexts without a pending request. |
78 | * See rdma_request() |
79 | * @addr: The remote peer's address |
80 | * @req_lock: Protects the active request list |
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; |
97 | struct ib_mr *dma_mr; |
98 | u32 lkey; |
99 | long timeout; |
100 | int sq_depth; |
101 | struct semaphore sq_sem; |
102 | int rq_depth; |
103 | struct semaphore rq_sem; |
104 | atomic_t excess_rc; |
105 | struct sockaddr_in addr; |
106 | spinlock_t req_lock; |
107 | |
108 | struct completion cm_done; |
109 | }; |
110 | |
111 | /** |
112 | * p9_rdma_context - Keeps track of in-process WR |
113 | * |
114 | * @wc_op: The original WR op for when the CQE completes in error. |
115 | * @busa: Bus address to unmap when the WR completes |
116 | * @req: Keeps track of requests (send) |
117 | * @rc: Keepts track of replies (receive) |
118 | */ |
119 | struct p9_rdma_req; |
120 | struct p9_rdma_context { |
121 | enum ib_wc_opcode wc_op; |
122 | dma_addr_t busa; |
123 | union { |
124 | struct p9_req_t *req; |
125 | struct p9_fcall *rc; |
126 | }; |
127 | }; |
128 | |
129 | /** |
130 | * p9_rdma_opts - Collection of mount options |
131 | * @port: port of connection |
132 | * @sq_depth: The requested depth of the SQ. This really doesn't need |
133 | * to be any deeper than the number of threads used in the client |
134 | * @rq_depth: The depth of the RQ. Should be greater than or equal to SQ depth |
135 | * @timeout: Time to wait in msecs for CM events |
136 | */ |
137 | struct p9_rdma_opts { |
138 | short port; |
139 | int sq_depth; |
140 | int rq_depth; |
141 | long timeout; |
142 | }; |
143 | |
144 | /* |
145 | * Option Parsing (code inspired by NFS code) |
146 | */ |
147 | enum { |
148 | /* Options that take integer arguments */ |
149 | Opt_port, Opt_rq_depth, Opt_sq_depth, Opt_timeout, Opt_err, |
150 | }; |
151 | |
152 | static match_table_t tokens = { |
153 | {Opt_port, "port=%u"}, |
154 | {Opt_sq_depth, "sq=%u"}, |
155 | {Opt_rq_depth, "rq=%u"}, |
156 | {Opt_timeout, "timeout=%u"}, |
157 | {Opt_err, NULL}, |
158 | }; |
159 | |
160 | /** |
161 | * parse_opts - parse mount options into rdma options structure |
162 | * @params: options string passed from mount |
163 | * @opts: rdma transport-specific structure to parse options into |
164 | * |
165 | * Returns 0 upon success, -ERRNO upon failure |
166 | */ |
167 | static int parse_opts(char *params, struct p9_rdma_opts *opts) |
168 | { |
169 | char *p; |
170 | substring_t args[MAX_OPT_ARGS]; |
171 | int option; |
172 | char *options, *tmp_options; |
173 | |
174 | opts->port = P9_PORT; |
175 | opts->sq_depth = P9_RDMA_SQ_DEPTH; |
176 | opts->rq_depth = P9_RDMA_RQ_DEPTH; |
177 | opts->timeout = P9_RDMA_TIMEOUT; |
178 | |
179 | if (!params) |
180 | return 0; |
181 | |
182 | tmp_options = kstrdup(params, GFP_KERNEL); |
183 | if (!tmp_options) { |
184 | p9_debug(P9_DEBUG_ERROR, |
185 | "failed to allocate copy of option string\n"); |
186 | return -ENOMEM; |
187 | } |
188 | options = tmp_options; |
189 | |
190 | while ((p = strsep(&options, ",")) != NULL) { |
191 | int token; |
192 | int r; |
193 | if (!*p) |
194 | continue; |
195 | token = match_token(p, tokens, args); |
196 | if (token == Opt_err) |
197 | continue; |
198 | r = match_int(&args[0], &option); |
199 | if (r < 0) { |
200 | p9_debug(P9_DEBUG_ERROR, |
201 | "integer field, but no integer?\n"); |
202 | continue; |
203 | } |
204 | switch (token) { |
205 | case Opt_port: |
206 | opts->port = option; |
207 | break; |
208 | case Opt_sq_depth: |
209 | opts->sq_depth = option; |
210 | break; |
211 | case Opt_rq_depth: |
212 | opts->rq_depth = option; |
213 | break; |
214 | case Opt_timeout: |
215 | opts->timeout = option; |
216 | break; |
217 | default: |
218 | continue; |
219 | } |
220 | } |
221 | /* RQ must be at least as large as the SQ */ |
222 | opts->rq_depth = max(opts->rq_depth, opts->sq_depth); |
223 | kfree(tmp_options); |
224 | return 0; |
225 | } |
226 | |
227 | static int |
228 | p9_cm_event_handler(struct rdma_cm_id *id, struct rdma_cm_event *event) |
229 | { |
230 | struct p9_client *c = id->context; |
231 | struct p9_trans_rdma *rdma = c->trans; |
232 | switch (event->event) { |
233 | case RDMA_CM_EVENT_ADDR_RESOLVED: |
234 | BUG_ON(rdma->state != P9_RDMA_INIT); |
235 | rdma->state = P9_RDMA_ADDR_RESOLVED; |
236 | break; |
237 | |
238 | case RDMA_CM_EVENT_ROUTE_RESOLVED: |
239 | BUG_ON(rdma->state != P9_RDMA_ADDR_RESOLVED); |
240 | rdma->state = P9_RDMA_ROUTE_RESOLVED; |
241 | break; |
242 | |
243 | case RDMA_CM_EVENT_ESTABLISHED: |
244 | BUG_ON(rdma->state != P9_RDMA_ROUTE_RESOLVED); |
245 | rdma->state = P9_RDMA_CONNECTED; |
246 | break; |
247 | |
248 | case RDMA_CM_EVENT_DISCONNECTED: |
249 | if (rdma) |
250 | rdma->state = P9_RDMA_CLOSED; |
251 | if (c) |
252 | c->status = Disconnected; |
253 | break; |
254 | |
255 | case RDMA_CM_EVENT_TIMEWAIT_EXIT: |
256 | break; |
257 | |
258 | case RDMA_CM_EVENT_ADDR_CHANGE: |
259 | case RDMA_CM_EVENT_ROUTE_ERROR: |
260 | case RDMA_CM_EVENT_DEVICE_REMOVAL: |
261 | case RDMA_CM_EVENT_MULTICAST_JOIN: |
262 | case RDMA_CM_EVENT_MULTICAST_ERROR: |
263 | case RDMA_CM_EVENT_REJECTED: |
264 | case RDMA_CM_EVENT_CONNECT_REQUEST: |
265 | case RDMA_CM_EVENT_CONNECT_RESPONSE: |
266 | case RDMA_CM_EVENT_CONNECT_ERROR: |
267 | case RDMA_CM_EVENT_ADDR_ERROR: |
268 | case RDMA_CM_EVENT_UNREACHABLE: |
269 | c->status = Disconnected; |
270 | rdma_disconnect(rdma->cm_id); |
271 | break; |
272 | default: |
273 | BUG(); |
274 | } |
275 | complete(&rdma->cm_done); |
276 | return 0; |
277 | } |
278 | |
279 | static void |
280 | handle_recv(struct p9_client *client, struct p9_trans_rdma *rdma, |
281 | struct p9_rdma_context *c, enum ib_wc_status status, u32 byte_len) |
282 | { |
283 | struct p9_req_t *req; |
284 | int err = 0; |
285 | int16_t tag; |
286 | |
287 | req = NULL; |
288 | ib_dma_unmap_single(rdma->cm_id->device, c->busa, client->msize, |
289 | DMA_FROM_DEVICE); |
290 | |
291 | if (status != IB_WC_SUCCESS) |
292 | goto err_out; |
293 | |
294 | err = p9_parse_header(c->rc, NULL, NULL, &tag, 1); |
295 | if (err) |
296 | goto err_out; |
297 | |
298 | req = p9_tag_lookup(client, tag); |
299 | if (!req) |
300 | goto err_out; |
301 | |
302 | /* Check that we have not yet received a reply for this request. |
303 | */ |
304 | if (unlikely(req->rc)) { |
305 | pr_err("Duplicate reply for request %d", tag); |
306 | goto err_out; |
307 | } |
308 | |
309 | req->rc = c->rc; |
310 | p9_client_cb(client, req, REQ_STATUS_RCVD); |
311 | |
312 | return; |
313 | |
314 | err_out: |
315 | p9_debug(P9_DEBUG_ERROR, "req %p err %d status %d\n", req, err, status); |
316 | rdma->state = P9_RDMA_FLUSHING; |
317 | client->status = Disconnected; |
318 | } |
319 | |
320 | static void |
321 | handle_send(struct p9_client *client, struct p9_trans_rdma *rdma, |
322 | struct p9_rdma_context *c, enum ib_wc_status status, u32 byte_len) |
323 | { |
324 | ib_dma_unmap_single(rdma->cm_id->device, |
325 | c->busa, c->req->tc->size, |
326 | DMA_TO_DEVICE); |
327 | } |
328 | |
329 | static void qp_event_handler(struct ib_event *event, void *context) |
330 | { |
331 | p9_debug(P9_DEBUG_ERROR, "QP event %d context %p\n", |
332 | event->event, context); |
333 | } |
334 | |
335 | static void cq_comp_handler(struct ib_cq *cq, void *cq_context) |
336 | { |
337 | struct p9_client *client = cq_context; |
338 | struct p9_trans_rdma *rdma = client->trans; |
339 | int ret; |
340 | struct ib_wc wc; |
341 | |
342 | ib_req_notify_cq(rdma->cq, IB_CQ_NEXT_COMP); |
343 | while ((ret = ib_poll_cq(cq, 1, &wc)) > 0) { |
344 | struct p9_rdma_context *c = (void *) (unsigned long) wc.wr_id; |
345 | |
346 | switch (c->wc_op) { |
347 | case IB_WC_RECV: |
348 | handle_recv(client, rdma, c, wc.status, wc.byte_len); |
349 | up(&rdma->rq_sem); |
350 | break; |
351 | |
352 | case IB_WC_SEND: |
353 | handle_send(client, rdma, c, wc.status, wc.byte_len); |
354 | up(&rdma->sq_sem); |
355 | break; |
356 | |
357 | default: |
358 | pr_err("unexpected completion type, c->wc_op=%d, wc.opcode=%d, status=%d\n", |
359 | c->wc_op, wc.opcode, wc.status); |
360 | break; |
361 | } |
362 | kfree(c); |
363 | } |
364 | } |
365 | |
366 | static void cq_event_handler(struct ib_event *e, void *v) |
367 | { |
368 | p9_debug(P9_DEBUG_ERROR, "CQ event %d context %p\n", e->event, v); |
369 | } |
370 | |
371 | static void rdma_destroy_trans(struct p9_trans_rdma *rdma) |
372 | { |
373 | if (!rdma) |
374 | return; |
375 | |
376 | if (rdma->dma_mr && !IS_ERR(rdma->dma_mr)) |
377 | ib_dereg_mr(rdma->dma_mr); |
378 | |
379 | if (rdma->qp && !IS_ERR(rdma->qp)) |
380 | ib_destroy_qp(rdma->qp); |
381 | |
382 | if (rdma->pd && !IS_ERR(rdma->pd)) |
383 | ib_dealloc_pd(rdma->pd); |
384 | |
385 | if (rdma->cq && !IS_ERR(rdma->cq)) |
386 | ib_destroy_cq(rdma->cq); |
387 | |
388 | if (rdma->cm_id && !IS_ERR(rdma->cm_id)) |
389 | rdma_destroy_id(rdma->cm_id); |
390 | |
391 | kfree(rdma); |
392 | } |
393 | |
394 | static int |
395 | post_recv(struct p9_client *client, struct p9_rdma_context *c) |
396 | { |
397 | struct p9_trans_rdma *rdma = client->trans; |
398 | struct ib_recv_wr wr, *bad_wr; |
399 | struct ib_sge sge; |
400 | |
401 | c->busa = ib_dma_map_single(rdma->cm_id->device, |
402 | c->rc->sdata, client->msize, |
403 | DMA_FROM_DEVICE); |
404 | if (ib_dma_mapping_error(rdma->cm_id->device, c->busa)) |
405 | goto error; |
406 | |
407 | sge.addr = c->busa; |
408 | sge.length = client->msize; |
409 | sge.lkey = rdma->lkey; |
410 | |
411 | wr.next = NULL; |
412 | c->wc_op = IB_WC_RECV; |
413 | wr.wr_id = (unsigned long) c; |
414 | wr.sg_list = &sge; |
415 | wr.num_sge = 1; |
416 | return ib_post_recv(rdma->qp, &wr, &bad_wr); |
417 | |
418 | error: |
419 | p9_debug(P9_DEBUG_ERROR, "EIO\n"); |
420 | return -EIO; |
421 | } |
422 | |
423 | static int rdma_request(struct p9_client *client, struct p9_req_t *req) |
424 | { |
425 | struct p9_trans_rdma *rdma = client->trans; |
426 | struct ib_send_wr wr, *bad_wr; |
427 | struct ib_sge sge; |
428 | int err = 0; |
429 | unsigned long flags; |
430 | struct p9_rdma_context *c = NULL; |
431 | struct p9_rdma_context *rpl_context = NULL; |
432 | |
433 | /* When an error occurs between posting the recv and the send, |
434 | * there will be a receive context posted without a pending request. |
435 | * Since there is no way to "un-post" it, we remember it and skip |
436 | * post_recv() for the next request. |
437 | * So here, |
438 | * see if we are this `next request' and need to absorb an excess rc. |
439 | * If yes, then drop and free our own, and do not recv_post(). |
440 | **/ |
441 | if (unlikely(atomic_read(&rdma->excess_rc) > 0)) { |
442 | if ((atomic_sub_return(1, &rdma->excess_rc) >= 0)) { |
443 | /* Got one ! */ |
444 | kfree(req->rc); |
445 | req->rc = NULL; |
446 | goto dont_need_post_recv; |
447 | } else { |
448 | /* We raced and lost. */ |
449 | atomic_inc(&rdma->excess_rc); |
450 | } |
451 | } |
452 | |
453 | /* Allocate an fcall for the reply */ |
454 | rpl_context = kmalloc(sizeof *rpl_context, GFP_NOFS); |
455 | if (!rpl_context) { |
456 | err = -ENOMEM; |
457 | goto recv_error; |
458 | } |
459 | rpl_context->rc = req->rc; |
460 | |
461 | /* |
462 | * Post a receive buffer for this request. We need to ensure |
463 | * there is a reply buffer available for every outstanding |
464 | * request. A flushed request can result in no reply for an |
465 | * outstanding request, so we must keep a count to avoid |
466 | * overflowing the RQ. |
467 | */ |
468 | if (down_interruptible(&rdma->rq_sem)) { |
469 | err = -EINTR; |
470 | goto recv_error; |
471 | } |
472 | |
473 | err = post_recv(client, rpl_context); |
474 | if (err) { |
475 | p9_debug(P9_DEBUG_FCALL, "POST RECV failed\n"); |
476 | goto recv_error; |
477 | } |
478 | /* remove posted receive buffer from request structure */ |
479 | req->rc = NULL; |
480 | |
481 | dont_need_post_recv: |
482 | /* Post the request */ |
483 | c = kmalloc(sizeof *c, GFP_NOFS); |
484 | if (!c) { |
485 | err = -ENOMEM; |
486 | goto send_error; |
487 | } |
488 | c->req = req; |
489 | |
490 | c->busa = ib_dma_map_single(rdma->cm_id->device, |
491 | c->req->tc->sdata, c->req->tc->size, |
492 | DMA_TO_DEVICE); |
493 | if (ib_dma_mapping_error(rdma->cm_id->device, c->busa)) { |
494 | err = -EIO; |
495 | goto send_error; |
496 | } |
497 | |
498 | sge.addr = c->busa; |
499 | sge.length = c->req->tc->size; |
500 | sge.lkey = rdma->lkey; |
501 | |
502 | wr.next = NULL; |
503 | c->wc_op = IB_WC_SEND; |
504 | wr.wr_id = (unsigned long) c; |
505 | wr.opcode = IB_WR_SEND; |
506 | wr.send_flags = IB_SEND_SIGNALED; |
507 | wr.sg_list = &sge; |
508 | wr.num_sge = 1; |
509 | |
510 | if (down_interruptible(&rdma->sq_sem)) { |
511 | err = -EINTR; |
512 | goto send_error; |
513 | } |
514 | |
515 | /* Mark request as `sent' *before* we actually send it, |
516 | * because doing if after could erase the REQ_STATUS_RCVD |
517 | * status in case of a very fast reply. |
518 | */ |
519 | req->status = REQ_STATUS_SENT; |
520 | err = ib_post_send(rdma->qp, &wr, &bad_wr); |
521 | if (err) |
522 | goto send_error; |
523 | |
524 | /* Success */ |
525 | return 0; |
526 | |
527 | /* Handle errors that happened during or while preparing the send: */ |
528 | send_error: |
529 | req->status = REQ_STATUS_ERROR; |
530 | kfree(c); |
531 | p9_debug(P9_DEBUG_ERROR, "Error %d in rdma_request()\n", err); |
532 | |
533 | /* Ach. |
534 | * We did recv_post(), but not send. We have one recv_post in excess. |
535 | */ |
536 | atomic_inc(&rdma->excess_rc); |
537 | return err; |
538 | |
539 | /* Handle errors that happened during or while preparing post_recv(): */ |
540 | recv_error: |
541 | kfree(rpl_context); |
542 | spin_lock_irqsave(&rdma->req_lock, flags); |
543 | if (rdma->state < P9_RDMA_CLOSING) { |
544 | rdma->state = P9_RDMA_CLOSING; |
545 | spin_unlock_irqrestore(&rdma->req_lock, flags); |
546 | rdma_disconnect(rdma->cm_id); |
547 | } else |
548 | spin_unlock_irqrestore(&rdma->req_lock, flags); |
549 | return err; |
550 | } |
551 | |
552 | static void rdma_close(struct p9_client *client) |
553 | { |
554 | struct p9_trans_rdma *rdma; |
555 | |
556 | if (!client) |
557 | return; |
558 | |
559 | rdma = client->trans; |
560 | if (!rdma) |
561 | return; |
562 | |
563 | client->status = Disconnected; |
564 | rdma_disconnect(rdma->cm_id); |
565 | rdma_destroy_trans(rdma); |
566 | } |
567 | |
568 | /** |
569 | * alloc_rdma - Allocate and initialize the rdma transport structure |
570 | * @opts: Mount options structure |
571 | */ |
572 | static struct p9_trans_rdma *alloc_rdma(struct p9_rdma_opts *opts) |
573 | { |
574 | struct p9_trans_rdma *rdma; |
575 | |
576 | rdma = kzalloc(sizeof(struct p9_trans_rdma), GFP_KERNEL); |
577 | if (!rdma) |
578 | return NULL; |
579 | |
580 | rdma->sq_depth = opts->sq_depth; |
581 | rdma->rq_depth = opts->rq_depth; |
582 | rdma->timeout = opts->timeout; |
583 | spin_lock_init(&rdma->req_lock); |
584 | init_completion(&rdma->cm_done); |
585 | sema_init(&rdma->sq_sem, rdma->sq_depth); |
586 | sema_init(&rdma->rq_sem, rdma->rq_depth); |
587 | atomic_set(&rdma->excess_rc, 0); |
588 | |
589 | return rdma; |
590 | } |
591 | |
592 | static int rdma_cancel(struct p9_client *client, struct p9_req_t *req) |
593 | { |
594 | /* Nothing to do here. |
595 | * We will take care of it (if we have to) in rdma_cancelled() |
596 | */ |
597 | return 1; |
598 | } |
599 | |
600 | /* A request has been fully flushed without a reply. |
601 | * That means we have posted one buffer in excess. |
602 | */ |
603 | static int rdma_cancelled(struct p9_client *client, struct p9_req_t *req) |
604 | { |
605 | struct p9_trans_rdma *rdma = client->trans; |
606 | atomic_inc(&rdma->excess_rc); |
607 | return 0; |
608 | } |
609 | |
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; |
624 | struct ib_device_attr devattr; |
625 | |
626 | /* Parse the transport specific mount options */ |
627 | err = parse_opts(args, &opts); |
628 | if (err < 0) |
629 | return err; |
630 | |
631 | /* Create and initialize the RDMA transport structure */ |
632 | rdma = alloc_rdma(&opts); |
633 | if (!rdma) |
634 | return -ENOMEM; |
635 | |
636 | /* Create the RDMA CM ID */ |
637 | rdma->cm_id = rdma_create_id(p9_cm_event_handler, client, RDMA_PS_TCP, |
638 | IB_QPT_RC); |
639 | if (IS_ERR(rdma->cm_id)) |
640 | goto error; |
641 | |
642 | /* Associate the client with the transport */ |
643 | client->trans = rdma; |
644 | |
645 | /* Resolve the server's address */ |
646 | rdma->addr.sin_family = AF_INET; |
647 | rdma->addr.sin_addr.s_addr = in_aton(addr); |
648 | rdma->addr.sin_port = htons(opts.port); |
649 | err = rdma_resolve_addr(rdma->cm_id, NULL, |
650 | (struct sockaddr *)&rdma->addr, |
651 | rdma->timeout); |
652 | if (err) |
653 | goto error; |
654 | err = wait_for_completion_interruptible(&rdma->cm_done); |
655 | if (err || (rdma->state != P9_RDMA_ADDR_RESOLVED)) |
656 | goto error; |
657 | |
658 | /* Resolve the route to the server */ |
659 | err = rdma_resolve_route(rdma->cm_id, rdma->timeout); |
660 | if (err) |
661 | goto error; |
662 | err = wait_for_completion_interruptible(&rdma->cm_done); |
663 | if (err || (rdma->state != P9_RDMA_ROUTE_RESOLVED)) |
664 | goto error; |
665 | |
666 | /* Query the device attributes */ |
667 | err = ib_query_device(rdma->cm_id->device, &devattr); |
668 | if (err) |
669 | goto error; |
670 | |
671 | /* Create the Completion Queue */ |
672 | rdma->cq = ib_create_cq(rdma->cm_id->device, cq_comp_handler, |
673 | cq_event_handler, client, |
674 | opts.sq_depth + opts.rq_depth + 1, 0); |
675 | if (IS_ERR(rdma->cq)) |
676 | goto error; |
677 | ib_req_notify_cq(rdma->cq, IB_CQ_NEXT_COMP); |
678 | |
679 | /* Create the Protection Domain */ |
680 | rdma->pd = ib_alloc_pd(rdma->cm_id->device); |
681 | if (IS_ERR(rdma->pd)) |
682 | goto error; |
683 | |
684 | /* Cache the DMA lkey in the transport */ |
685 | rdma->dma_mr = NULL; |
686 | if (devattr.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY) |
687 | rdma->lkey = rdma->cm_id->device->local_dma_lkey; |
688 | else { |
689 | rdma->dma_mr = ib_get_dma_mr(rdma->pd, IB_ACCESS_LOCAL_WRITE); |
690 | if (IS_ERR(rdma->dma_mr)) |
691 | goto error; |
692 | rdma->lkey = rdma->dma_mr->lkey; |
693 | } |
694 | |
695 | /* Create the Queue Pair */ |
696 | memset(&qp_attr, 0, sizeof qp_attr); |
697 | qp_attr.event_handler = qp_event_handler; |
698 | qp_attr.qp_context = client; |
699 | qp_attr.cap.max_send_wr = opts.sq_depth; |
700 | qp_attr.cap.max_recv_wr = opts.rq_depth; |
701 | qp_attr.cap.max_send_sge = P9_RDMA_SEND_SGE; |
702 | qp_attr.cap.max_recv_sge = P9_RDMA_RECV_SGE; |
703 | qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; |
704 | qp_attr.qp_type = IB_QPT_RC; |
705 | qp_attr.send_cq = rdma->cq; |
706 | qp_attr.recv_cq = rdma->cq; |
707 | err = rdma_create_qp(rdma->cm_id, rdma->pd, &qp_attr); |
708 | if (err) |
709 | goto error; |
710 | rdma->qp = rdma->cm_id->qp; |
711 | |
712 | /* Request a connection */ |
713 | memset(&conn_param, 0, sizeof(conn_param)); |
714 | conn_param.private_data = NULL; |
715 | conn_param.private_data_len = 0; |
716 | conn_param.responder_resources = P9_RDMA_IRD; |
717 | conn_param.initiator_depth = P9_RDMA_ORD; |
718 | err = rdma_connect(rdma->cm_id, &conn_param); |
719 | if (err) |
720 | goto error; |
721 | err = wait_for_completion_interruptible(&rdma->cm_done); |
722 | if (err || (rdma->state != P9_RDMA_CONNECTED)) |
723 | goto error; |
724 | |
725 | client->status = Connected; |
726 | |
727 | return 0; |
728 | |
729 | error: |
730 | rdma_destroy_trans(rdma); |
731 | return -ENOTCONN; |
732 | } |
733 | |
734 | static struct p9_trans_module p9_rdma_trans = { |
735 | .name = "rdma", |
736 | .maxsize = P9_RDMA_MAXSIZE, |
737 | .def = 0, |
738 | .owner = THIS_MODULE, |
739 | .create = rdma_create_trans, |
740 | .close = rdma_close, |
741 | .request = rdma_request, |
742 | .cancel = rdma_cancel, |
743 | .cancelled = rdma_cancelled, |
744 | }; |
745 | |
746 | /** |
747 | * p9_trans_rdma_init - Register the 9P RDMA transport driver |
748 | */ |
749 | static int __init p9_trans_rdma_init(void) |
750 | { |
751 | v9fs_register_trans(&p9_rdma_trans); |
752 | return 0; |
753 | } |
754 | |
755 | static void __exit p9_trans_rdma_exit(void) |
756 | { |
757 | v9fs_unregister_trans(&p9_rdma_trans); |
758 | } |
759 | |
760 | module_init(p9_trans_rdma_init); |
761 | module_exit(p9_trans_rdma_exit); |
762 | |
763 | MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>"); |
764 | MODULE_DESCRIPTION("RDMA Transport for 9P"); |
765 | MODULE_LICENSE("Dual BSD/GPL"); |
766 |
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