Commit | Line | Data |
---|---|---|
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 | ||
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> | |
5a0e3ad6 | 43 | #include <linux/slab.h> |
fc79d4b1 TT |
44 | #include <net/9p/9p.h> |
45 | #include <net/9p/client.h> | |
46 | #include <net/9p/transport.h> | |
47 | #include <rdma/ib_verbs.h> | |
48 | #include <rdma/rdma_cm.h> | |
fc79d4b1 TT |
49 | |
50 | #define P9_PORT 5640 | |
51 | #define P9_RDMA_SQ_DEPTH 32 | |
52 | #define P9_RDMA_RQ_DEPTH 32 | |
53 | #define P9_RDMA_SEND_SGE 4 | |
54 | #define P9_RDMA_RECV_SGE 4 | |
55 | #define P9_RDMA_IRD 0 | |
56 | #define P9_RDMA_ORD 0 | |
57 | #define P9_RDMA_TIMEOUT 30000 /* 30 seconds */ | |
58 | #define P9_RDMA_MAXSIZE (4*4096) /* Min SGE is 4, so we can | |
59 | * safely advertise a maxsize | |
60 | * of 64k */ | |
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. | |
0e15597e | 76 | * @rq_count: Count of requests in the Receive Queue. |
fc79d4b1 TT |
77 | * @addr: The remote peer's address |
78 | * @req_lock: Protects the active request list | |
fc79d4b1 TT |
79 | * @cm_done: Completion event for connection management tracking |
80 | */ | |
81 | struct p9_trans_rdma { | |
82 | enum { | |
83 | P9_RDMA_INIT, | |
84 | P9_RDMA_ADDR_RESOLVED, | |
85 | P9_RDMA_ROUTE_RESOLVED, | |
86 | P9_RDMA_CONNECTED, | |
87 | P9_RDMA_FLUSHING, | |
88 | P9_RDMA_CLOSING, | |
89 | P9_RDMA_CLOSED, | |
90 | } state; | |
91 | struct rdma_cm_id *cm_id; | |
92 | struct ib_pd *pd; | |
93 | struct ib_qp *qp; | |
94 | struct ib_cq *cq; | |
95 | struct ib_mr *dma_mr; | |
96 | u32 lkey; | |
97 | long timeout; | |
98 | int sq_depth; | |
99 | struct semaphore sq_sem; | |
100 | int rq_depth; | |
101 | atomic_t rq_count; | |
102 | struct sockaddr_in addr; | |
103 | spinlock_t req_lock; | |
104 | ||
105 | struct completion cm_done; | |
106 | }; | |
107 | ||
108 | /** | |
109 | * p9_rdma_context - Keeps track of in-process WR | |
110 | * | |
111 | * @wc_op: The original WR op for when the CQE completes in error. | |
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 { | |
118 | enum ib_wc_opcode wc_op; | |
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; | |
139 | }; | |
140 | ||
141 | /* | |
142 | * Option Parsing (code inspired by NFS code) | |
143 | */ | |
144 | enum { | |
145 | /* Options that take integer arguments */ | |
146 | Opt_port, Opt_rq_depth, Opt_sq_depth, Opt_timeout, Opt_err, | |
147 | }; | |
148 | ||
149 | static match_table_t tokens = { | |
150 | {Opt_port, "port=%u"}, | |
151 | {Opt_sq_depth, "sq=%u"}, | |
152 | {Opt_rq_depth, "rq=%u"}, | |
153 | {Opt_timeout, "timeout=%u"}, | |
154 | {Opt_err, NULL}, | |
155 | }; | |
156 | ||
157 | /** | |
0e15597e AK |
158 | * parse_opts - parse mount options into rdma options structure |
159 | * @params: options string passed from mount | |
160 | * @opts: rdma transport-specific structure to parse options into | |
fc79d4b1 TT |
161 | * |
162 | * Returns 0 upon success, -ERRNO upon failure | |
163 | */ | |
164 | static int parse_opts(char *params, struct p9_rdma_opts *opts) | |
165 | { | |
166 | char *p; | |
167 | substring_t args[MAX_OPT_ARGS]; | |
168 | int option; | |
d8c8a9e3 | 169 | char *options, *tmp_options; |
fc79d4b1 TT |
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 | ||
d8c8a9e3 EVH |
179 | tmp_options = kstrdup(params, GFP_KERNEL); |
180 | if (!tmp_options) { | |
fc79d4b1 TT |
181 | P9_DPRINTK(P9_DEBUG_ERROR, |
182 | "failed to allocate copy of option string\n"); | |
183 | return -ENOMEM; | |
184 | } | |
d8c8a9e3 | 185 | options = tmp_options; |
fc79d4b1 TT |
186 | |
187 | while ((p = strsep(&options, ",")) != NULL) { | |
188 | int token; | |
189 | int r; | |
190 | if (!*p) | |
191 | continue; | |
192 | token = match_token(p, tokens, args); | |
193 | r = match_int(&args[0], &option); | |
194 | if (r < 0) { | |
195 | P9_DPRINTK(P9_DEBUG_ERROR, | |
196 | "integer field, but no integer?\n"); | |
fc79d4b1 TT |
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); | |
d8c8a9e3 | 218 | kfree(tmp_options); |
fc79d4b1 TT |
219 | return 0; |
220 | } | |
221 | ||
222 | static int | |
223 | p9_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 | ||
274 | static void | |
275 | handle_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; | |
1bab88b2 | 298 | req->status = REQ_STATUS_RCVD; |
fc79d4b1 TT |
299 | 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; | |
fc79d4b1 TT |
308 | } |
309 | ||
310 | static void | |
311 | handle_send(struct p9_client *client, struct p9_trans_rdma *rdma, | |
312 | struct p9_rdma_context *c, enum ib_wc_status status, u32 byte_len) | |
313 | { | |
314 | ib_dma_unmap_single(rdma->cm_id->device, | |
315 | c->busa, c->req->tc->size, | |
316 | DMA_TO_DEVICE); | |
317 | } | |
318 | ||
319 | static void qp_event_handler(struct ib_event *event, void *context) | |
320 | { | |
321 | P9_DPRINTK(P9_DEBUG_ERROR, "QP event %d context %p\n", event->event, | |
322 | context); | |
323 | } | |
324 | ||
325 | static void cq_comp_handler(struct ib_cq *cq, void *cq_context) | |
326 | { | |
327 | struct p9_client *client = cq_context; | |
328 | struct p9_trans_rdma *rdma = client->trans; | |
329 | int ret; | |
330 | struct ib_wc wc; | |
331 | ||
332 | ib_req_notify_cq(rdma->cq, IB_CQ_NEXT_COMP); | |
333 | while ((ret = ib_poll_cq(cq, 1, &wc)) > 0) { | |
334 | struct p9_rdma_context *c = (void *) (unsigned long) wc.wr_id; | |
335 | ||
336 | switch (c->wc_op) { | |
337 | case IB_WC_RECV: | |
338 | atomic_dec(&rdma->rq_count); | |
339 | handle_recv(client, rdma, c, wc.status, wc.byte_len); | |
340 | break; | |
341 | ||
342 | case IB_WC_SEND: | |
343 | handle_send(client, rdma, c, wc.status, wc.byte_len); | |
344 | up(&rdma->sq_sem); | |
345 | break; | |
346 | ||
347 | default: | |
348 | printk(KERN_ERR "9prdma: unexpected completion type, " | |
349 | "c->wc_op=%d, wc.opcode=%d, status=%d\n", | |
350 | c->wc_op, wc.opcode, wc.status); | |
351 | break; | |
352 | } | |
353 | kfree(c); | |
354 | } | |
355 | } | |
356 | ||
357 | static void cq_event_handler(struct ib_event *e, void *v) | |
358 | { | |
359 | P9_DPRINTK(P9_DEBUG_ERROR, "CQ event %d context %p\n", e->event, v); | |
360 | } | |
361 | ||
362 | static void rdma_destroy_trans(struct p9_trans_rdma *rdma) | |
363 | { | |
364 | if (!rdma) | |
365 | return; | |
366 | ||
367 | if (rdma->dma_mr && !IS_ERR(rdma->dma_mr)) | |
368 | ib_dereg_mr(rdma->dma_mr); | |
369 | ||
370 | if (rdma->qp && !IS_ERR(rdma->qp)) | |
371 | ib_destroy_qp(rdma->qp); | |
372 | ||
373 | if (rdma->pd && !IS_ERR(rdma->pd)) | |
374 | ib_dealloc_pd(rdma->pd); | |
375 | ||
376 | if (rdma->cq && !IS_ERR(rdma->cq)) | |
377 | ib_destroy_cq(rdma->cq); | |
378 | ||
379 | if (rdma->cm_id && !IS_ERR(rdma->cm_id)) | |
380 | rdma_destroy_id(rdma->cm_id); | |
381 | ||
382 | kfree(rdma); | |
383 | } | |
384 | ||
385 | static int | |
386 | post_recv(struct p9_client *client, struct p9_rdma_context *c) | |
387 | { | |
388 | struct p9_trans_rdma *rdma = client->trans; | |
389 | struct ib_recv_wr wr, *bad_wr; | |
390 | struct ib_sge sge; | |
391 | ||
392 | c->busa = ib_dma_map_single(rdma->cm_id->device, | |
393 | c->rc->sdata, client->msize, | |
394 | DMA_FROM_DEVICE); | |
395 | if (ib_dma_mapping_error(rdma->cm_id->device, c->busa)) | |
396 | goto error; | |
397 | ||
398 | sge.addr = c->busa; | |
399 | sge.length = client->msize; | |
400 | sge.lkey = rdma->lkey; | |
401 | ||
402 | wr.next = NULL; | |
403 | c->wc_op = IB_WC_RECV; | |
404 | wr.wr_id = (unsigned long) c; | |
405 | wr.sg_list = &sge; | |
406 | wr.num_sge = 1; | |
407 | return ib_post_recv(rdma->qp, &wr, &bad_wr); | |
408 | ||
409 | error: | |
410 | P9_DPRINTK(P9_DEBUG_ERROR, "EIO\n"); | |
411 | return -EIO; | |
412 | } | |
413 | ||
414 | static int rdma_request(struct p9_client *client, struct p9_req_t *req) | |
415 | { | |
416 | struct p9_trans_rdma *rdma = client->trans; | |
417 | struct ib_send_wr wr, *bad_wr; | |
418 | struct ib_sge sge; | |
419 | int err = 0; | |
420 | unsigned long flags; | |
421 | struct p9_rdma_context *c = NULL; | |
422 | struct p9_rdma_context *rpl_context = NULL; | |
423 | ||
424 | /* Allocate an fcall for the reply */ | |
eeff66ef | 425 | rpl_context = kmalloc(sizeof *rpl_context, GFP_NOFS); |
1d6400c7 DB |
426 | if (!rpl_context) { |
427 | err = -ENOMEM; | |
fc79d4b1 | 428 | goto err_close; |
1d6400c7 | 429 | } |
fc79d4b1 TT |
430 | |
431 | /* | |
432 | * If the request has a buffer, steal it, otherwise | |
433 | * allocate a new one. Typically, requests should already | |
434 | * have receive buffers allocated and just swap them around | |
435 | */ | |
436 | if (!req->rc) { | |
437 | req->rc = kmalloc(sizeof(struct p9_fcall)+client->msize, | |
eeff66ef | 438 | GFP_NOFS); |
fc79d4b1 TT |
439 | if (req->rc) { |
440 | req->rc->sdata = (char *) req->rc + | |
441 | sizeof(struct p9_fcall); | |
442 | req->rc->capacity = client->msize; | |
443 | } | |
444 | } | |
445 | rpl_context->rc = req->rc; | |
446 | if (!rpl_context->rc) { | |
1d6400c7 DB |
447 | err = -ENOMEM; |
448 | goto err_free2; | |
fc79d4b1 TT |
449 | } |
450 | ||
451 | /* | |
452 | * Post a receive buffer for this request. We need to ensure | |
453 | * there is a reply buffer available for every outstanding | |
454 | * request. A flushed request can result in no reply for an | |
455 | * outstanding request, so we must keep a count to avoid | |
456 | * overflowing the RQ. | |
457 | */ | |
458 | if (atomic_inc_return(&rdma->rq_count) <= rdma->rq_depth) { | |
459 | err = post_recv(client, rpl_context); | |
1d6400c7 DB |
460 | if (err) |
461 | goto err_free1; | |
fc79d4b1 TT |
462 | } else |
463 | atomic_dec(&rdma->rq_count); | |
464 | ||
465 | /* remove posted receive buffer from request structure */ | |
466 | req->rc = NULL; | |
467 | ||
468 | /* Post the request */ | |
eeff66ef | 469 | c = kmalloc(sizeof *c, GFP_NOFS); |
1d6400c7 DB |
470 | if (!c) { |
471 | err = -ENOMEM; | |
472 | goto err_free1; | |
473 | } | |
fc79d4b1 TT |
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: | |
1d6400c7 DB |
500 | kfree(c); |
501 | kfree(rpl_context->rc); | |
502 | kfree(rpl_context); | |
fc79d4b1 TT |
503 | P9_DPRINTK(P9_DEBUG_ERROR, "EIO\n"); |
504 | return -EIO; | |
1d6400c7 DB |
505 | err_free1: |
506 | kfree(rpl_context->rc); | |
507 | err_free2: | |
508 | kfree(rpl_context); | |
fc79d4b1 TT |
509 | err_close: |
510 | spin_lock_irqsave(&rdma->req_lock, flags); | |
511 | if (rdma->state < P9_RDMA_CLOSING) { | |
512 | rdma->state = P9_RDMA_CLOSING; | |
513 | spin_unlock_irqrestore(&rdma->req_lock, flags); | |
514 | rdma_disconnect(rdma->cm_id); | |
515 | } else | |
516 | spin_unlock_irqrestore(&rdma->req_lock, flags); | |
517 | return err; | |
518 | } | |
519 | ||
520 | static void rdma_close(struct p9_client *client) | |
521 | { | |
522 | struct p9_trans_rdma *rdma; | |
523 | ||
524 | if (!client) | |
525 | return; | |
526 | ||
527 | rdma = client->trans; | |
528 | if (!rdma) | |
529 | return; | |
530 | ||
531 | client->status = Disconnected; | |
532 | rdma_disconnect(rdma->cm_id); | |
533 | rdma_destroy_trans(rdma); | |
534 | } | |
535 | ||
536 | /** | |
537 | * alloc_rdma - Allocate and initialize the rdma transport structure | |
fc79d4b1 TT |
538 | * @opts: Mount options structure |
539 | */ | |
540 | static struct p9_trans_rdma *alloc_rdma(struct p9_rdma_opts *opts) | |
541 | { | |
542 | struct p9_trans_rdma *rdma; | |
543 | ||
544 | rdma = kzalloc(sizeof(struct p9_trans_rdma), GFP_KERNEL); | |
545 | if (!rdma) | |
546 | return NULL; | |
547 | ||
548 | rdma->sq_depth = opts->sq_depth; | |
549 | rdma->rq_depth = opts->rq_depth; | |
550 | rdma->timeout = opts->timeout; | |
551 | spin_lock_init(&rdma->req_lock); | |
552 | init_completion(&rdma->cm_done); | |
553 | sema_init(&rdma->sq_sem, rdma->sq_depth); | |
554 | atomic_set(&rdma->rq_count, 0); | |
555 | ||
556 | return rdma; | |
557 | } | |
558 | ||
559 | /* its not clear to me we can do anything after send has been posted */ | |
560 | static int rdma_cancel(struct p9_client *client, struct p9_req_t *req) | |
561 | { | |
562 | return 1; | |
563 | } | |
564 | ||
565 | /** | |
566 | * trans_create_rdma - Transport method for creating atransport instance | |
567 | * @client: client instance | |
568 | * @addr: IP address string | |
569 | * @args: Mount options string | |
570 | */ | |
571 | static int | |
572 | rdma_create_trans(struct p9_client *client, const char *addr, char *args) | |
573 | { | |
574 | int err; | |
575 | struct p9_rdma_opts opts; | |
576 | struct p9_trans_rdma *rdma; | |
577 | struct rdma_conn_param conn_param; | |
578 | struct ib_qp_init_attr qp_attr; | |
579 | struct ib_device_attr devattr; | |
580 | ||
581 | /* Parse the transport specific mount options */ | |
582 | err = parse_opts(args, &opts); | |
583 | if (err < 0) | |
584 | return err; | |
585 | ||
586 | /* Create and initialize the RDMA transport structure */ | |
587 | rdma = alloc_rdma(&opts); | |
588 | if (!rdma) | |
589 | return -ENOMEM; | |
590 | ||
591 | /* Create the RDMA CM ID */ | |
b26f9b99 SH |
592 | rdma->cm_id = rdma_create_id(p9_cm_event_handler, client, RDMA_PS_TCP, |
593 | IB_QPT_RC); | |
fc79d4b1 TT |
594 | if (IS_ERR(rdma->cm_id)) |
595 | goto error; | |
596 | ||
517ac45a TT |
597 | /* Associate the client with the transport */ |
598 | client->trans = rdma; | |
599 | ||
fc79d4b1 TT |
600 | /* Resolve the server's address */ |
601 | rdma->addr.sin_family = AF_INET; | |
602 | rdma->addr.sin_addr.s_addr = in_aton(addr); | |
603 | rdma->addr.sin_port = htons(opts.port); | |
604 | err = rdma_resolve_addr(rdma->cm_id, NULL, | |
605 | (struct sockaddr *)&rdma->addr, | |
606 | rdma->timeout); | |
607 | if (err) | |
608 | goto error; | |
609 | err = wait_for_completion_interruptible(&rdma->cm_done); | |
610 | if (err || (rdma->state != P9_RDMA_ADDR_RESOLVED)) | |
611 | goto error; | |
612 | ||
613 | /* Resolve the route to the server */ | |
614 | err = rdma_resolve_route(rdma->cm_id, rdma->timeout); | |
615 | if (err) | |
616 | goto error; | |
617 | err = wait_for_completion_interruptible(&rdma->cm_done); | |
618 | if (err || (rdma->state != P9_RDMA_ROUTE_RESOLVED)) | |
619 | goto error; | |
620 | ||
621 | /* Query the device attributes */ | |
622 | err = ib_query_device(rdma->cm_id->device, &devattr); | |
623 | if (err) | |
624 | goto error; | |
625 | ||
626 | /* Create the Completion Queue */ | |
627 | rdma->cq = ib_create_cq(rdma->cm_id->device, cq_comp_handler, | |
628 | cq_event_handler, client, | |
629 | opts.sq_depth + opts.rq_depth + 1, 0); | |
630 | if (IS_ERR(rdma->cq)) | |
631 | goto error; | |
632 | ib_req_notify_cq(rdma->cq, IB_CQ_NEXT_COMP); | |
633 | ||
634 | /* Create the Protection Domain */ | |
635 | rdma->pd = ib_alloc_pd(rdma->cm_id->device); | |
636 | if (IS_ERR(rdma->pd)) | |
637 | goto error; | |
638 | ||
639 | /* Cache the DMA lkey in the transport */ | |
640 | rdma->dma_mr = NULL; | |
641 | if (devattr.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY) | |
642 | rdma->lkey = rdma->cm_id->device->local_dma_lkey; | |
643 | else { | |
644 | rdma->dma_mr = ib_get_dma_mr(rdma->pd, IB_ACCESS_LOCAL_WRITE); | |
645 | if (IS_ERR(rdma->dma_mr)) | |
646 | goto error; | |
647 | rdma->lkey = rdma->dma_mr->lkey; | |
648 | } | |
649 | ||
650 | /* Create the Queue Pair */ | |
651 | memset(&qp_attr, 0, sizeof qp_attr); | |
652 | qp_attr.event_handler = qp_event_handler; | |
653 | qp_attr.qp_context = client; | |
654 | qp_attr.cap.max_send_wr = opts.sq_depth; | |
655 | qp_attr.cap.max_recv_wr = opts.rq_depth; | |
656 | qp_attr.cap.max_send_sge = P9_RDMA_SEND_SGE; | |
657 | qp_attr.cap.max_recv_sge = P9_RDMA_RECV_SGE; | |
658 | qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
659 | qp_attr.qp_type = IB_QPT_RC; | |
660 | qp_attr.send_cq = rdma->cq; | |
661 | qp_attr.recv_cq = rdma->cq; | |
662 | err = rdma_create_qp(rdma->cm_id, rdma->pd, &qp_attr); | |
663 | if (err) | |
664 | goto error; | |
665 | rdma->qp = rdma->cm_id->qp; | |
666 | ||
667 | /* Request a connection */ | |
668 | memset(&conn_param, 0, sizeof(conn_param)); | |
669 | conn_param.private_data = NULL; | |
670 | conn_param.private_data_len = 0; | |
671 | conn_param.responder_resources = P9_RDMA_IRD; | |
672 | conn_param.initiator_depth = P9_RDMA_ORD; | |
673 | err = rdma_connect(rdma->cm_id, &conn_param); | |
674 | if (err) | |
675 | goto error; | |
676 | err = wait_for_completion_interruptible(&rdma->cm_done); | |
677 | if (err || (rdma->state != P9_RDMA_CONNECTED)) | |
678 | goto error; | |
679 | ||
fc79d4b1 TT |
680 | client->status = Connected; |
681 | ||
682 | return 0; | |
683 | ||
684 | error: | |
685 | rdma_destroy_trans(rdma); | |
686 | return -ENOTCONN; | |
687 | } | |
688 | ||
689 | static struct p9_trans_module p9_rdma_trans = { | |
690 | .name = "rdma", | |
691 | .maxsize = P9_RDMA_MAXSIZE, | |
692 | .def = 0, | |
693 | .owner = THIS_MODULE, | |
694 | .create = rdma_create_trans, | |
695 | .close = rdma_close, | |
696 | .request = rdma_request, | |
697 | .cancel = rdma_cancel, | |
698 | }; | |
699 | ||
700 | /** | |
701 | * p9_trans_rdma_init - Register the 9P RDMA transport driver | |
702 | */ | |
703 | static int __init p9_trans_rdma_init(void) | |
704 | { | |
705 | v9fs_register_trans(&p9_rdma_trans); | |
706 | return 0; | |
707 | } | |
708 | ||
709 | static void __exit p9_trans_rdma_exit(void) | |
710 | { | |
711 | v9fs_unregister_trans(&p9_rdma_trans); | |
712 | } | |
713 | ||
714 | module_init(p9_trans_rdma_init); | |
715 | module_exit(p9_trans_rdma_exit); | |
716 | ||
717 | MODULE_AUTHOR("Tom Tucker <tom@opengridcomputing.com>"); | |
718 | MODULE_DESCRIPTION("RDMA Transport for 9P"); | |
719 | MODULE_LICENSE("Dual BSD/GPL"); |