blob: ac4990041ebb94d9935126f4cd76430fb7fa7201 [file] [log] [blame]
Tom Tuckerfc79d4b2008-10-22 18:47:39 -05001/*
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#include <linux/in.h>
30#include <linux/module.h>
31#include <linux/net.h>
32#include <linux/ipv6.h>
33#include <linux/kthread.h>
34#include <linux/errno.h>
35#include <linux/kernel.h>
36#include <linux/un.h>
37#include <linux/uaccess.h>
38#include <linux/inet.h>
39#include <linux/idr.h>
40#include <linux/file.h>
41#include <linux/parser.h>
42#include <linux/semaphore.h>
43#include <net/9p/9p.h>
44#include <net/9p/client.h>
45#include <net/9p/transport.h>
46#include <rdma/ib_verbs.h>
47#include <rdma/rdma_cm.h>
Tom Tuckerfc79d4b2008-10-22 18:47:39 -050048
49#define P9_PORT 5640
50#define P9_RDMA_SQ_DEPTH 32
51#define P9_RDMA_RQ_DEPTH 32
52#define P9_RDMA_SEND_SGE 4
53#define P9_RDMA_RECV_SGE 4
54#define P9_RDMA_IRD 0
55#define P9_RDMA_ORD 0
56#define P9_RDMA_TIMEOUT 30000 /* 30 seconds */
57#define P9_RDMA_MAXSIZE (4*4096) /* Min SGE is 4, so we can
58 * safely advertise a maxsize
59 * of 64k */
60
61#define P9_RDMA_MAX_SGE (P9_RDMA_MAXSIZE >> PAGE_SHIFT)
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 * @lkey: The local access only memory region key
71 * @timeout: Number of uSecs to wait for connection management events
72 * @sq_depth: The depth of the Send Queue
73 * @sq_sem: Semaphore for the SQ
74 * @rq_depth: The depth of the Receive Queue.
75 * @addr: The remote peer's address
76 * @req_lock: Protects the active request list
77 * @send_wait: Wait list when the SQ fills up
78 * @cm_done: Completion event for connection management tracking
79 */
80struct p9_trans_rdma {
81 enum {
82 P9_RDMA_INIT,
83 P9_RDMA_ADDR_RESOLVED,
84 P9_RDMA_ROUTE_RESOLVED,
85 P9_RDMA_CONNECTED,
86 P9_RDMA_FLUSHING,
87 P9_RDMA_CLOSING,
88 P9_RDMA_CLOSED,
89 } state;
90 struct rdma_cm_id *cm_id;
91 struct ib_pd *pd;
92 struct ib_qp *qp;
93 struct ib_cq *cq;
94 struct ib_mr *dma_mr;
95 u32 lkey;
96 long timeout;
97 int sq_depth;
98 struct semaphore sq_sem;
99 int rq_depth;
100 atomic_t rq_count;
101 struct sockaddr_in addr;
102 spinlock_t req_lock;
103
104 struct completion cm_done;
105};
106
107/**
108 * p9_rdma_context - Keeps track of in-process WR
109 *
110 * @wc_op: The original WR op for when the CQE completes in error.
111 * @busa: Bus address to unmap when the WR completes
112 * @req: Keeps track of requests (send)
113 * @rc: Keepts track of replies (receive)
114 */
115struct p9_rdma_req;
116struct p9_rdma_context {
117 enum ib_wc_opcode wc_op;
118 dma_addr_t busa;
119 union {
120 struct p9_req_t *req;
121 struct p9_fcall *rc;
122 };
123};
124
125/**
126 * p9_rdma_opts - Collection of mount options
127 * @port: port of connection
128 * @sq_depth: The requested depth of the SQ. This really doesn't need
129 * to be any deeper than the number of threads used in the client
130 * @rq_depth: The depth of the RQ. Should be greater than or equal to SQ depth
131 * @timeout: Time to wait in msecs for CM events
132 */
133struct p9_rdma_opts {
134 short port;
135 int sq_depth;
136 int rq_depth;
137 long timeout;
138};
139
140/*
141 * Option Parsing (code inspired by NFS code)
142 */
143enum {
144 /* Options that take integer arguments */
145 Opt_port, Opt_rq_depth, Opt_sq_depth, Opt_timeout, Opt_err,
146};
147
148static match_table_t tokens = {
149 {Opt_port, "port=%u"},
150 {Opt_sq_depth, "sq=%u"},
151 {Opt_rq_depth, "rq=%u"},
152 {Opt_timeout, "timeout=%u"},
153 {Opt_err, NULL},
154};
155
156/**
157 * parse_options - parse mount options into session structure
158 * @options: options string passed from mount
159 * @opts: transport-specific structure to parse options into
160 *
161 * Returns 0 upon success, -ERRNO upon failure
162 */
163static int parse_opts(char *params, struct p9_rdma_opts *opts)
164{
165 char *p;
166 substring_t args[MAX_OPT_ARGS];
167 int option;
168 char *options;
169 int ret;
170
171 opts->port = P9_PORT;
172 opts->sq_depth = P9_RDMA_SQ_DEPTH;
173 opts->rq_depth = P9_RDMA_RQ_DEPTH;
174 opts->timeout = P9_RDMA_TIMEOUT;
175
176 if (!params)
177 return 0;
178
179 options = kstrdup(params, GFP_KERNEL);
180 if (!options) {
181 P9_DPRINTK(P9_DEBUG_ERROR,
182 "failed to allocate copy of option string\n");
183 return -ENOMEM;
184 }
185
186 while ((p = strsep(&options, ",")) != NULL) {
187 int token;
188 int r;
189 if (!*p)
190 continue;
191 token = match_token(p, tokens, args);
192 r = match_int(&args[0], &option);
193 if (r < 0) {
194 P9_DPRINTK(P9_DEBUG_ERROR,
195 "integer field, but no integer?\n");
196 ret = r;
197 continue;
198 }
199 switch (token) {
200 case Opt_port:
201 opts->port = option;
202 break;
203 case Opt_sq_depth:
204 opts->sq_depth = option;
205 break;
206 case Opt_rq_depth:
207 opts->rq_depth = option;
208 break;
209 case Opt_timeout:
210 opts->timeout = option;
211 break;
212 default:
213 continue;
214 }
215 }
216 /* RQ must be at least as large as the SQ */
217 opts->rq_depth = max(opts->rq_depth, opts->sq_depth);
218 kfree(options);
219 return 0;
220}
221
222static int
223p9_cm_event_handler(struct rdma_cm_id *id, struct rdma_cm_event *event)
224{
225 struct p9_client *c = id->context;
226 struct p9_trans_rdma *rdma = c->trans;
227 switch (event->event) {
228 case RDMA_CM_EVENT_ADDR_RESOLVED:
229 BUG_ON(rdma->state != P9_RDMA_INIT);
230 rdma->state = P9_RDMA_ADDR_RESOLVED;
231 break;
232
233 case RDMA_CM_EVENT_ROUTE_RESOLVED:
234 BUG_ON(rdma->state != P9_RDMA_ADDR_RESOLVED);
235 rdma->state = P9_RDMA_ROUTE_RESOLVED;
236 break;
237
238 case RDMA_CM_EVENT_ESTABLISHED:
239 BUG_ON(rdma->state != P9_RDMA_ROUTE_RESOLVED);
240 rdma->state = P9_RDMA_CONNECTED;
241 break;
242
243 case RDMA_CM_EVENT_DISCONNECTED:
244 if (rdma)
245 rdma->state = P9_RDMA_CLOSED;
246 if (c)
247 c->status = Disconnected;
248 break;
249
250 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
251 break;
252
253 case RDMA_CM_EVENT_ADDR_CHANGE:
254 case RDMA_CM_EVENT_ROUTE_ERROR:
255 case RDMA_CM_EVENT_DEVICE_REMOVAL:
256 case RDMA_CM_EVENT_MULTICAST_JOIN:
257 case RDMA_CM_EVENT_MULTICAST_ERROR:
258 case RDMA_CM_EVENT_REJECTED:
259 case RDMA_CM_EVENT_CONNECT_REQUEST:
260 case RDMA_CM_EVENT_CONNECT_RESPONSE:
261 case RDMA_CM_EVENT_CONNECT_ERROR:
262 case RDMA_CM_EVENT_ADDR_ERROR:
263 case RDMA_CM_EVENT_UNREACHABLE:
264 c->status = Disconnected;
265 rdma_disconnect(rdma->cm_id);
266 break;
267 default:
268 BUG();
269 }
270 complete(&rdma->cm_done);
271 return 0;
272}
273
274static void
275handle_recv(struct p9_client *client, struct p9_trans_rdma *rdma,
276 struct p9_rdma_context *c, enum ib_wc_status status, u32 byte_len)
277{
278 struct p9_req_t *req;
279 int err = 0;
280 int16_t tag;
281
282 req = NULL;
283 ib_dma_unmap_single(rdma->cm_id->device, c->busa, client->msize,
284 DMA_FROM_DEVICE);
285
286 if (status != IB_WC_SUCCESS)
287 goto err_out;
288
289 err = p9_parse_header(c->rc, NULL, NULL, &tag, 1);
290 if (err)
291 goto err_out;
292
293 req = p9_tag_lookup(client, tag);
294 if (!req)
295 goto err_out;
296
297 req->rc = c->rc;
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500298 req->status = REQ_STATUS_RCVD;
Tom Tuckerfc79d4b2008-10-22 18:47:39 -0500299 p9_client_cb(client, req);
300
301 return;
302
303 err_out:
304 P9_DPRINTK(P9_DEBUG_ERROR, "req %p err %d status %d\n",
305 req, err, status);
306 rdma->state = P9_RDMA_FLUSHING;
307 client->status = Disconnected;
308 return;
309}
310
311static void
312handle_send(struct p9_client *client, struct p9_trans_rdma *rdma,
313 struct p9_rdma_context *c, enum ib_wc_status status, u32 byte_len)
314{
315 ib_dma_unmap_single(rdma->cm_id->device,
316 c->busa, c->req->tc->size,
317 DMA_TO_DEVICE);
318}
319
320static void qp_event_handler(struct ib_event *event, void *context)
321{
322 P9_DPRINTK(P9_DEBUG_ERROR, "QP event %d context %p\n", event->event,
323 context);
324}
325
326static void cq_comp_handler(struct ib_cq *cq, void *cq_context)
327{
328 struct p9_client *client = cq_context;
329 struct p9_trans_rdma *rdma = client->trans;
330 int ret;
331 struct ib_wc wc;
332
333 ib_req_notify_cq(rdma->cq, IB_CQ_NEXT_COMP);
334 while ((ret = ib_poll_cq(cq, 1, &wc)) > 0) {
335 struct p9_rdma_context *c = (void *) (unsigned long) wc.wr_id;
336
337 switch (c->wc_op) {
338 case IB_WC_RECV:
339 atomic_dec(&rdma->rq_count);
340 handle_recv(client, rdma, c, wc.status, wc.byte_len);
341 break;
342
343 case IB_WC_SEND:
344 handle_send(client, rdma, c, wc.status, wc.byte_len);
345 up(&rdma->sq_sem);
346 break;
347
348 default:
349 printk(KERN_ERR "9prdma: unexpected completion type, "
350 "c->wc_op=%d, wc.opcode=%d, status=%d\n",
351 c->wc_op, wc.opcode, wc.status);
352 break;
353 }
354 kfree(c);
355 }
356}
357
358static void cq_event_handler(struct ib_event *e, void *v)
359{
360 P9_DPRINTK(P9_DEBUG_ERROR, "CQ event %d context %p\n", e->event, v);
361}
362
363static void rdma_destroy_trans(struct p9_trans_rdma *rdma)
364{
365 if (!rdma)
366 return;
367
368 if (rdma->dma_mr && !IS_ERR(rdma->dma_mr))
369 ib_dereg_mr(rdma->dma_mr);
370
371 if (rdma->qp && !IS_ERR(rdma->qp))
372 ib_destroy_qp(rdma->qp);
373
374 if (rdma->pd && !IS_ERR(rdma->pd))
375 ib_dealloc_pd(rdma->pd);
376
377 if (rdma->cq && !IS_ERR(rdma->cq))
378 ib_destroy_cq(rdma->cq);
379
380 if (rdma->cm_id && !IS_ERR(rdma->cm_id))
381 rdma_destroy_id(rdma->cm_id);
382
383 kfree(rdma);
384}
385
386static int
387post_recv(struct p9_client *client, struct p9_rdma_context *c)
388{
389 struct p9_trans_rdma *rdma = client->trans;
390 struct ib_recv_wr wr, *bad_wr;
391 struct ib_sge sge;
392
393 c->busa = ib_dma_map_single(rdma->cm_id->device,
394 c->rc->sdata, client->msize,
395 DMA_FROM_DEVICE);
396 if (ib_dma_mapping_error(rdma->cm_id->device, c->busa))
397 goto error;
398
399 sge.addr = c->busa;
400 sge.length = client->msize;
401 sge.lkey = rdma->lkey;
402
403 wr.next = NULL;
404 c->wc_op = IB_WC_RECV;
405 wr.wr_id = (unsigned long) c;
406 wr.sg_list = &sge;
407 wr.num_sge = 1;
408 return ib_post_recv(rdma->qp, &wr, &bad_wr);
409
410 error:
411 P9_DPRINTK(P9_DEBUG_ERROR, "EIO\n");
412 return -EIO;
413}
414
415static int rdma_request(struct p9_client *client, struct p9_req_t *req)
416{
417 struct p9_trans_rdma *rdma = client->trans;
418 struct ib_send_wr wr, *bad_wr;
419 struct ib_sge sge;
420 int err = 0;
421 unsigned long flags;
422 struct p9_rdma_context *c = NULL;
423 struct p9_rdma_context *rpl_context = NULL;
424
425 /* Allocate an fcall for the reply */
426 rpl_context = kmalloc(sizeof *rpl_context, GFP_KERNEL);
427 if (!rpl_context)
428 goto err_close;
429
430 /*
431 * If the request has a buffer, steal it, otherwise
432 * allocate a new one. Typically, requests should already
433 * have receive buffers allocated and just swap them around
434 */
435 if (!req->rc) {
436 req->rc = kmalloc(sizeof(struct p9_fcall)+client->msize,
437 GFP_KERNEL);
438 if (req->rc) {
439 req->rc->sdata = (char *) req->rc +
440 sizeof(struct p9_fcall);
441 req->rc->capacity = client->msize;
442 }
443 }
444 rpl_context->rc = req->rc;
445 if (!rpl_context->rc) {
446 kfree(rpl_context);
447 goto err_close;
448 }
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 */
457 if (atomic_inc_return(&rdma->rq_count) <= rdma->rq_depth) {
458 err = post_recv(client, rpl_context);
459 if (err) {
460 kfree(rpl_context->rc);
461 kfree(rpl_context);
462 goto err_close;
463 }
464 } else
465 atomic_dec(&rdma->rq_count);
466
467 /* remove posted receive buffer from request structure */
468 req->rc = NULL;
469
470 /* Post the request */
471 c = kmalloc(sizeof *c, GFP_KERNEL);
472 if (!c)
473 goto err_close;
474 c->req = req;
475
476 c->busa = ib_dma_map_single(rdma->cm_id->device,
477 c->req->tc->sdata, c->req->tc->size,
478 DMA_TO_DEVICE);
479 if (ib_dma_mapping_error(rdma->cm_id->device, c->busa))
480 goto error;
481
482 sge.addr = c->busa;
483 sge.length = c->req->tc->size;
484 sge.lkey = rdma->lkey;
485
486 wr.next = NULL;
487 c->wc_op = IB_WC_SEND;
488 wr.wr_id = (unsigned long) c;
489 wr.opcode = IB_WR_SEND;
490 wr.send_flags = IB_SEND_SIGNALED;
491 wr.sg_list = &sge;
492 wr.num_sge = 1;
493
494 if (down_interruptible(&rdma->sq_sem))
495 goto error;
496
497 return ib_post_send(rdma->qp, &wr, &bad_wr);
498
499 error:
500 P9_DPRINTK(P9_DEBUG_ERROR, "EIO\n");
501 return -EIO;
502
503 err_close:
504 spin_lock_irqsave(&rdma->req_lock, flags);
505 if (rdma->state < P9_RDMA_CLOSING) {
506 rdma->state = P9_RDMA_CLOSING;
507 spin_unlock_irqrestore(&rdma->req_lock, flags);
508 rdma_disconnect(rdma->cm_id);
509 } else
510 spin_unlock_irqrestore(&rdma->req_lock, flags);
511 return err;
512}
513
514static void rdma_close(struct p9_client *client)
515{
516 struct p9_trans_rdma *rdma;
517
518 if (!client)
519 return;
520
521 rdma = client->trans;
522 if (!rdma)
523 return;
524
525 client->status = Disconnected;
526 rdma_disconnect(rdma->cm_id);
527 rdma_destroy_trans(rdma);
528}
529
530/**
531 * alloc_rdma - Allocate and initialize the rdma transport structure
Tom Tuckerfc79d4b2008-10-22 18:47:39 -0500532 * @opts: Mount options structure
533 */
534static struct p9_trans_rdma *alloc_rdma(struct p9_rdma_opts *opts)
535{
536 struct p9_trans_rdma *rdma;
537
538 rdma = kzalloc(sizeof(struct p9_trans_rdma), GFP_KERNEL);
539 if (!rdma)
540 return NULL;
541
542 rdma->sq_depth = opts->sq_depth;
543 rdma->rq_depth = opts->rq_depth;
544 rdma->timeout = opts->timeout;
545 spin_lock_init(&rdma->req_lock);
546 init_completion(&rdma->cm_done);
547 sema_init(&rdma->sq_sem, rdma->sq_depth);
548 atomic_set(&rdma->rq_count, 0);
549
550 return rdma;
551}
552
553/* its not clear to me we can do anything after send has been posted */
554static int rdma_cancel(struct p9_client *client, struct p9_req_t *req)
555{
556 return 1;
557}
558
559/**
560 * trans_create_rdma - Transport method for creating atransport instance
561 * @client: client instance
562 * @addr: IP address string
563 * @args: Mount options string
564 */
565static int
566rdma_create_trans(struct p9_client *client, const char *addr, char *args)
567{
568 int err;
569 struct p9_rdma_opts opts;
570 struct p9_trans_rdma *rdma;
571 struct rdma_conn_param conn_param;
572 struct ib_qp_init_attr qp_attr;
573 struct ib_device_attr devattr;
574
575 /* Parse the transport specific mount options */
576 err = parse_opts(args, &opts);
577 if (err < 0)
578 return err;
579
580 /* Create and initialize the RDMA transport structure */
581 rdma = alloc_rdma(&opts);
582 if (!rdma)
583 return -ENOMEM;
584
585 /* Create the RDMA CM ID */
586 rdma->cm_id = rdma_create_id(p9_cm_event_handler, client, RDMA_PS_TCP);
587 if (IS_ERR(rdma->cm_id))
588 goto error;
589
Tom Tucker517ac452008-10-23 16:30:13 -0500590 /* Associate the client with the transport */
591 client->trans = rdma;
592
Tom Tuckerfc79d4b2008-10-22 18:47:39 -0500593 /* Resolve the server's address */
594 rdma->addr.sin_family = AF_INET;
595 rdma->addr.sin_addr.s_addr = in_aton(addr);
596 rdma->addr.sin_port = htons(opts.port);
597 err = rdma_resolve_addr(rdma->cm_id, NULL,
598 (struct sockaddr *)&rdma->addr,
599 rdma->timeout);
600 if (err)
601 goto error;
602 err = wait_for_completion_interruptible(&rdma->cm_done);
603 if (err || (rdma->state != P9_RDMA_ADDR_RESOLVED))
604 goto error;
605
606 /* Resolve the route to the server */
607 err = rdma_resolve_route(rdma->cm_id, rdma->timeout);
608 if (err)
609 goto error;
610 err = wait_for_completion_interruptible(&rdma->cm_done);
611 if (err || (rdma->state != P9_RDMA_ROUTE_RESOLVED))
612 goto error;
613
614 /* Query the device attributes */
615 err = ib_query_device(rdma->cm_id->device, &devattr);
616 if (err)
617 goto error;
618
619 /* Create the Completion Queue */
620 rdma->cq = ib_create_cq(rdma->cm_id->device, cq_comp_handler,
621 cq_event_handler, client,
622 opts.sq_depth + opts.rq_depth + 1, 0);
623 if (IS_ERR(rdma->cq))
624 goto error;
625 ib_req_notify_cq(rdma->cq, IB_CQ_NEXT_COMP);
626
627 /* Create the Protection Domain */
628 rdma->pd = ib_alloc_pd(rdma->cm_id->device);
629 if (IS_ERR(rdma->pd))
630 goto error;
631
632 /* Cache the DMA lkey in the transport */
633 rdma->dma_mr = NULL;
634 if (devattr.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY)
635 rdma->lkey = rdma->cm_id->device->local_dma_lkey;
636 else {
637 rdma->dma_mr = ib_get_dma_mr(rdma->pd, IB_ACCESS_LOCAL_WRITE);
638 if (IS_ERR(rdma->dma_mr))
639 goto error;
640 rdma->lkey = rdma->dma_mr->lkey;
641 }
642
643 /* Create the Queue Pair */
644 memset(&qp_attr, 0, sizeof qp_attr);
645 qp_attr.event_handler = qp_event_handler;
646 qp_attr.qp_context = client;
647 qp_attr.cap.max_send_wr = opts.sq_depth;
648 qp_attr.cap.max_recv_wr = opts.rq_depth;
649 qp_attr.cap.max_send_sge = P9_RDMA_SEND_SGE;
650 qp_attr.cap.max_recv_sge = P9_RDMA_RECV_SGE;
651 qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
652 qp_attr.qp_type = IB_QPT_RC;
653 qp_attr.send_cq = rdma->cq;
654 qp_attr.recv_cq = rdma->cq;
655 err = rdma_create_qp(rdma->cm_id, rdma->pd, &qp_attr);
656 if (err)
657 goto error;
658 rdma->qp = rdma->cm_id->qp;
659
660 /* Request a connection */
661 memset(&conn_param, 0, sizeof(conn_param));
662 conn_param.private_data = NULL;
663 conn_param.private_data_len = 0;
664 conn_param.responder_resources = P9_RDMA_IRD;
665 conn_param.initiator_depth = P9_RDMA_ORD;
666 err = rdma_connect(rdma->cm_id, &conn_param);
667 if (err)
668 goto error;
669 err = wait_for_completion_interruptible(&rdma->cm_done);
670 if (err || (rdma->state != P9_RDMA_CONNECTED))
671 goto error;
672
Tom Tuckerfc79d4b2008-10-22 18:47:39 -0500673 client->status = Connected;
674
675 return 0;
676
677error:
678 rdma_destroy_trans(rdma);
679 return -ENOTCONN;
680}
681
682static struct p9_trans_module p9_rdma_trans = {
683 .name = "rdma",
684 .maxsize = P9_RDMA_MAXSIZE,
685 .def = 0,
686 .owner = THIS_MODULE,
687 .create = rdma_create_trans,
688 .close = rdma_close,
689 .request = rdma_request,
690 .cancel = rdma_cancel,
691};
692
693/**
694 * p9_trans_rdma_init - Register the 9P RDMA transport driver
695 */
696static int __init p9_trans_rdma_init(void)
697{
698 v9fs_register_trans(&p9_rdma_trans);
699 return 0;
700}
701
702static void __exit p9_trans_rdma_exit(void)
703{
704 v9fs_unregister_trans(&p9_rdma_trans);
705}
706
707module_init(p9_trans_rdma_init);
708module_exit(p9_trans_rdma_exit);
709
710MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>");
711MODULE_DESCRIPTION("RDMA Transport for 9P");
712MODULE_LICENSE("Dual BSD/GPL");