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f58851e6 | 1 | /* |
c56c65fb TT |
2 | * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved. |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the BSD-type | |
8 | * license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or without | |
11 | * modification, are permitted provided that the following conditions | |
12 | * are met: | |
13 | * | |
14 | * Redistributions of source code must retain the above copyright | |
15 | * notice, this list of conditions and the following disclaimer. | |
16 | * | |
17 | * Redistributions in binary form must reproduce the above | |
18 | * copyright notice, this list of conditions and the following | |
19 | * disclaimer in the documentation and/or other materials provided | |
20 | * with the distribution. | |
21 | * | |
22 | * Neither the name of the Network Appliance, Inc. nor the names of | |
23 | * its contributors may be used to endorse or promote products | |
24 | * derived from this software without specific prior written | |
25 | * permission. | |
26 | * | |
27 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
28 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
29 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
30 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
31 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
32 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
33 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
34 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
35 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
36 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
37 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
f58851e6 TT |
38 | */ |
39 | ||
c56c65fb TT |
40 | /* |
41 | * verbs.c | |
42 | * | |
43 | * Encapsulates the major functions managing: | |
44 | * o adapters | |
45 | * o endpoints | |
46 | * o connections | |
47 | * o buffer memory | |
48 | */ | |
49 | ||
50 | #include <linux/pci.h> /* for Tavor hack below */ | |
51 | ||
f58851e6 TT |
52 | #include "xprt_rdma.h" |
53 | ||
c56c65fb TT |
54 | /* |
55 | * Globals/Macros | |
56 | */ | |
57 | ||
58 | #ifdef RPC_DEBUG | |
59 | # define RPCDBG_FACILITY RPCDBG_TRANS | |
60 | #endif | |
61 | ||
62 | /* | |
63 | * internal functions | |
64 | */ | |
65 | ||
66 | /* | |
67 | * handle replies in tasklet context, using a single, global list | |
68 | * rdma tasklet function -- just turn around and call the func | |
69 | * for all replies on the list | |
70 | */ | |
71 | ||
72 | static DEFINE_SPINLOCK(rpcrdma_tk_lock_g); | |
73 | static LIST_HEAD(rpcrdma_tasklets_g); | |
74 | ||
75 | static void | |
76 | rpcrdma_run_tasklet(unsigned long data) | |
77 | { | |
78 | struct rpcrdma_rep *rep; | |
79 | void (*func)(struct rpcrdma_rep *); | |
80 | unsigned long flags; | |
81 | ||
82 | data = data; | |
83 | spin_lock_irqsave(&rpcrdma_tk_lock_g, flags); | |
84 | while (!list_empty(&rpcrdma_tasklets_g)) { | |
85 | rep = list_entry(rpcrdma_tasklets_g.next, | |
86 | struct rpcrdma_rep, rr_list); | |
87 | list_del(&rep->rr_list); | |
88 | func = rep->rr_func; | |
89 | rep->rr_func = NULL; | |
90 | spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags); | |
91 | ||
92 | if (func) | |
93 | func(rep); | |
94 | else | |
95 | rpcrdma_recv_buffer_put(rep); | |
96 | ||
97 | spin_lock_irqsave(&rpcrdma_tk_lock_g, flags); | |
98 | } | |
99 | spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags); | |
100 | } | |
101 | ||
102 | static DECLARE_TASKLET(rpcrdma_tasklet_g, rpcrdma_run_tasklet, 0UL); | |
103 | ||
104 | static inline void | |
105 | rpcrdma_schedule_tasklet(struct rpcrdma_rep *rep) | |
106 | { | |
107 | unsigned long flags; | |
108 | ||
109 | spin_lock_irqsave(&rpcrdma_tk_lock_g, flags); | |
110 | list_add_tail(&rep->rr_list, &rpcrdma_tasklets_g); | |
111 | spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags); | |
112 | tasklet_schedule(&rpcrdma_tasklet_g); | |
113 | } | |
114 | ||
115 | static void | |
116 | rpcrdma_qp_async_error_upcall(struct ib_event *event, void *context) | |
117 | { | |
118 | struct rpcrdma_ep *ep = context; | |
119 | ||
120 | dprintk("RPC: %s: QP error %X on device %s ep %p\n", | |
121 | __func__, event->event, event->device->name, context); | |
122 | if (ep->rep_connected == 1) { | |
123 | ep->rep_connected = -EIO; | |
124 | ep->rep_func(ep); | |
125 | wake_up_all(&ep->rep_connect_wait); | |
126 | } | |
127 | } | |
128 | ||
129 | static void | |
130 | rpcrdma_cq_async_error_upcall(struct ib_event *event, void *context) | |
131 | { | |
132 | struct rpcrdma_ep *ep = context; | |
133 | ||
134 | dprintk("RPC: %s: CQ error %X on device %s ep %p\n", | |
135 | __func__, event->event, event->device->name, context); | |
136 | if (ep->rep_connected == 1) { | |
137 | ep->rep_connected = -EIO; | |
138 | ep->rep_func(ep); | |
139 | wake_up_all(&ep->rep_connect_wait); | |
140 | } | |
141 | } | |
142 | ||
143 | static inline | |
144 | void rpcrdma_event_process(struct ib_wc *wc) | |
145 | { | |
146 | struct rpcrdma_rep *rep = | |
147 | (struct rpcrdma_rep *)(unsigned long) wc->wr_id; | |
148 | ||
149 | dprintk("RPC: %s: event rep %p status %X opcode %X length %u\n", | |
150 | __func__, rep, wc->status, wc->opcode, wc->byte_len); | |
151 | ||
152 | if (!rep) /* send or bind completion that we don't care about */ | |
153 | return; | |
154 | ||
155 | if (IB_WC_SUCCESS != wc->status) { | |
156 | dprintk("RPC: %s: %s WC status %X, connection lost\n", | |
157 | __func__, (wc->opcode & IB_WC_RECV) ? "recv" : "send", | |
158 | wc->status); | |
159 | rep->rr_len = ~0U; | |
160 | rpcrdma_schedule_tasklet(rep); | |
161 | return; | |
162 | } | |
163 | ||
164 | switch (wc->opcode) { | |
165 | case IB_WC_RECV: | |
166 | rep->rr_len = wc->byte_len; | |
167 | ib_dma_sync_single_for_cpu( | |
168 | rdmab_to_ia(rep->rr_buffer)->ri_id->device, | |
169 | rep->rr_iov.addr, rep->rr_len, DMA_FROM_DEVICE); | |
170 | /* Keep (only) the most recent credits, after check validity */ | |
171 | if (rep->rr_len >= 16) { | |
172 | struct rpcrdma_msg *p = | |
173 | (struct rpcrdma_msg *) rep->rr_base; | |
174 | unsigned int credits = ntohl(p->rm_credit); | |
175 | if (credits == 0) { | |
176 | dprintk("RPC: %s: server" | |
177 | " dropped credits to 0!\n", __func__); | |
178 | /* don't deadlock */ | |
179 | credits = 1; | |
180 | } else if (credits > rep->rr_buffer->rb_max_requests) { | |
181 | dprintk("RPC: %s: server" | |
182 | " over-crediting: %d (%d)\n", | |
183 | __func__, credits, | |
184 | rep->rr_buffer->rb_max_requests); | |
185 | credits = rep->rr_buffer->rb_max_requests; | |
186 | } | |
187 | atomic_set(&rep->rr_buffer->rb_credits, credits); | |
188 | } | |
189 | /* fall through */ | |
190 | case IB_WC_BIND_MW: | |
191 | rpcrdma_schedule_tasklet(rep); | |
192 | break; | |
193 | default: | |
194 | dprintk("RPC: %s: unexpected WC event %X\n", | |
195 | __func__, wc->opcode); | |
196 | break; | |
197 | } | |
198 | } | |
199 | ||
200 | static inline int | |
201 | rpcrdma_cq_poll(struct ib_cq *cq) | |
202 | { | |
203 | struct ib_wc wc; | |
204 | int rc; | |
205 | ||
206 | for (;;) { | |
207 | rc = ib_poll_cq(cq, 1, &wc); | |
208 | if (rc < 0) { | |
209 | dprintk("RPC: %s: ib_poll_cq failed %i\n", | |
210 | __func__, rc); | |
211 | return rc; | |
212 | } | |
213 | if (rc == 0) | |
214 | break; | |
215 | ||
216 | rpcrdma_event_process(&wc); | |
217 | } | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | /* | |
223 | * rpcrdma_cq_event_upcall | |
224 | * | |
225 | * This upcall handles recv, send, bind and unbind events. | |
226 | * It is reentrant but processes single events in order to maintain | |
227 | * ordering of receives to keep server credits. | |
228 | * | |
229 | * It is the responsibility of the scheduled tasklet to return | |
230 | * recv buffers to the pool. NOTE: this affects synchronization of | |
231 | * connection shutdown. That is, the structures required for | |
232 | * the completion of the reply handler must remain intact until | |
233 | * all memory has been reclaimed. | |
234 | * | |
235 | * Note that send events are suppressed and do not result in an upcall. | |
236 | */ | |
237 | static void | |
238 | rpcrdma_cq_event_upcall(struct ib_cq *cq, void *context) | |
239 | { | |
240 | int rc; | |
241 | ||
242 | rc = rpcrdma_cq_poll(cq); | |
243 | if (rc) | |
244 | return; | |
245 | ||
246 | rc = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); | |
247 | if (rc) { | |
248 | dprintk("RPC: %s: ib_req_notify_cq failed %i\n", | |
249 | __func__, rc); | |
250 | return; | |
251 | } | |
252 | ||
253 | rpcrdma_cq_poll(cq); | |
254 | } | |
255 | ||
256 | #ifdef RPC_DEBUG | |
257 | static const char * const conn[] = { | |
258 | "address resolved", | |
259 | "address error", | |
260 | "route resolved", | |
261 | "route error", | |
262 | "connect request", | |
263 | "connect response", | |
264 | "connect error", | |
265 | "unreachable", | |
266 | "rejected", | |
267 | "established", | |
268 | "disconnected", | |
269 | "device removal" | |
270 | }; | |
271 | #endif | |
272 | ||
273 | static int | |
274 | rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event) | |
275 | { | |
276 | struct rpcrdma_xprt *xprt = id->context; | |
277 | struct rpcrdma_ia *ia = &xprt->rx_ia; | |
278 | struct rpcrdma_ep *ep = &xprt->rx_ep; | |
279 | struct sockaddr_in *addr = (struct sockaddr_in *) &ep->rep_remote_addr; | |
280 | struct ib_qp_attr attr; | |
281 | struct ib_qp_init_attr iattr; | |
282 | int connstate = 0; | |
283 | ||
284 | switch (event->event) { | |
285 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
286 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
287 | complete(&ia->ri_done); | |
288 | break; | |
289 | case RDMA_CM_EVENT_ADDR_ERROR: | |
290 | ia->ri_async_rc = -EHOSTUNREACH; | |
291 | dprintk("RPC: %s: CM address resolution error, ep 0x%p\n", | |
292 | __func__, ep); | |
293 | complete(&ia->ri_done); | |
294 | break; | |
295 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
296 | ia->ri_async_rc = -ENETUNREACH; | |
297 | dprintk("RPC: %s: CM route resolution error, ep 0x%p\n", | |
298 | __func__, ep); | |
299 | complete(&ia->ri_done); | |
300 | break; | |
301 | case RDMA_CM_EVENT_ESTABLISHED: | |
302 | connstate = 1; | |
303 | ib_query_qp(ia->ri_id->qp, &attr, | |
304 | IB_QP_MAX_QP_RD_ATOMIC | IB_QP_MAX_DEST_RD_ATOMIC, | |
305 | &iattr); | |
306 | dprintk("RPC: %s: %d responder resources" | |
307 | " (%d initiator)\n", | |
308 | __func__, attr.max_dest_rd_atomic, attr.max_rd_atomic); | |
309 | goto connected; | |
310 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
311 | connstate = -ENOTCONN; | |
312 | goto connected; | |
313 | case RDMA_CM_EVENT_UNREACHABLE: | |
314 | connstate = -ENETDOWN; | |
315 | goto connected; | |
316 | case RDMA_CM_EVENT_REJECTED: | |
317 | connstate = -ECONNREFUSED; | |
318 | goto connected; | |
319 | case RDMA_CM_EVENT_DISCONNECTED: | |
320 | connstate = -ECONNABORTED; | |
321 | goto connected; | |
322 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
323 | connstate = -ENODEV; | |
324 | connected: | |
325 | dprintk("RPC: %s: %s: %u.%u.%u.%u:%u" | |
326 | " (ep 0x%p event 0x%x)\n", | |
327 | __func__, | |
328 | (event->event <= 11) ? conn[event->event] : | |
329 | "unknown connection error", | |
330 | NIPQUAD(addr->sin_addr.s_addr), | |
331 | ntohs(addr->sin_port), | |
332 | ep, event->event); | |
333 | atomic_set(&rpcx_to_rdmax(ep->rep_xprt)->rx_buf.rb_credits, 1); | |
334 | dprintk("RPC: %s: %sconnected\n", | |
335 | __func__, connstate > 0 ? "" : "dis"); | |
336 | ep->rep_connected = connstate; | |
337 | ep->rep_func(ep); | |
338 | wake_up_all(&ep->rep_connect_wait); | |
339 | break; | |
340 | default: | |
341 | ia->ri_async_rc = -EINVAL; | |
342 | dprintk("RPC: %s: unexpected CM event %X\n", | |
343 | __func__, event->event); | |
344 | complete(&ia->ri_done); | |
345 | break; | |
346 | } | |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
351 | static struct rdma_cm_id * | |
352 | rpcrdma_create_id(struct rpcrdma_xprt *xprt, | |
353 | struct rpcrdma_ia *ia, struct sockaddr *addr) | |
354 | { | |
355 | struct rdma_cm_id *id; | |
356 | int rc; | |
357 | ||
358 | id = rdma_create_id(rpcrdma_conn_upcall, xprt, RDMA_PS_TCP); | |
359 | if (IS_ERR(id)) { | |
360 | rc = PTR_ERR(id); | |
361 | dprintk("RPC: %s: rdma_create_id() failed %i\n", | |
362 | __func__, rc); | |
363 | return id; | |
364 | } | |
365 | ||
366 | ia->ri_async_rc = 0; | |
367 | rc = rdma_resolve_addr(id, NULL, addr, RDMA_RESOLVE_TIMEOUT); | |
368 | if (rc) { | |
369 | dprintk("RPC: %s: rdma_resolve_addr() failed %i\n", | |
370 | __func__, rc); | |
371 | goto out; | |
372 | } | |
373 | wait_for_completion(&ia->ri_done); | |
374 | rc = ia->ri_async_rc; | |
375 | if (rc) | |
376 | goto out; | |
377 | ||
378 | ia->ri_async_rc = 0; | |
379 | rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT); | |
380 | if (rc) { | |
381 | dprintk("RPC: %s: rdma_resolve_route() failed %i\n", | |
382 | __func__, rc); | |
383 | goto out; | |
384 | } | |
385 | wait_for_completion(&ia->ri_done); | |
386 | rc = ia->ri_async_rc; | |
387 | if (rc) | |
388 | goto out; | |
389 | ||
390 | return id; | |
391 | ||
392 | out: | |
393 | rdma_destroy_id(id); | |
394 | return ERR_PTR(rc); | |
395 | } | |
396 | ||
397 | /* | |
398 | * Drain any cq, prior to teardown. | |
399 | */ | |
400 | static void | |
401 | rpcrdma_clean_cq(struct ib_cq *cq) | |
402 | { | |
403 | struct ib_wc wc; | |
404 | int count = 0; | |
405 | ||
406 | while (1 == ib_poll_cq(cq, 1, &wc)) | |
407 | ++count; | |
408 | ||
409 | if (count) | |
410 | dprintk("RPC: %s: flushed %d events (last 0x%x)\n", | |
411 | __func__, count, wc.opcode); | |
412 | } | |
413 | ||
414 | /* | |
415 | * Exported functions. | |
416 | */ | |
417 | ||
418 | /* | |
419 | * Open and initialize an Interface Adapter. | |
420 | * o initializes fields of struct rpcrdma_ia, including | |
421 | * interface and provider attributes and protection zone. | |
422 | */ | |
423 | int | |
424 | rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg) | |
425 | { | |
426 | int rc; | |
427 | struct rpcrdma_ia *ia = &xprt->rx_ia; | |
428 | ||
429 | init_completion(&ia->ri_done); | |
430 | ||
431 | ia->ri_id = rpcrdma_create_id(xprt, ia, addr); | |
432 | if (IS_ERR(ia->ri_id)) { | |
433 | rc = PTR_ERR(ia->ri_id); | |
434 | goto out1; | |
435 | } | |
436 | ||
437 | ia->ri_pd = ib_alloc_pd(ia->ri_id->device); | |
438 | if (IS_ERR(ia->ri_pd)) { | |
439 | rc = PTR_ERR(ia->ri_pd); | |
440 | dprintk("RPC: %s: ib_alloc_pd() failed %i\n", | |
441 | __func__, rc); | |
442 | goto out2; | |
443 | } | |
444 | ||
445 | /* | |
446 | * Optionally obtain an underlying physical identity mapping in | |
447 | * order to do a memory window-based bind. This base registration | |
448 | * is protected from remote access - that is enabled only by binding | |
449 | * for the specific bytes targeted during each RPC operation, and | |
450 | * revoked after the corresponding completion similar to a storage | |
451 | * adapter. | |
452 | */ | |
453 | if (memreg > RPCRDMA_REGISTER) { | |
454 | int mem_priv = IB_ACCESS_LOCAL_WRITE; | |
455 | switch (memreg) { | |
456 | #if RPCRDMA_PERSISTENT_REGISTRATION | |
457 | case RPCRDMA_ALLPHYSICAL: | |
458 | mem_priv |= IB_ACCESS_REMOTE_WRITE; | |
459 | mem_priv |= IB_ACCESS_REMOTE_READ; | |
460 | break; | |
461 | #endif | |
462 | case RPCRDMA_MEMWINDOWS_ASYNC: | |
463 | case RPCRDMA_MEMWINDOWS: | |
464 | mem_priv |= IB_ACCESS_MW_BIND; | |
465 | break; | |
466 | default: | |
467 | break; | |
468 | } | |
469 | ia->ri_bind_mem = ib_get_dma_mr(ia->ri_pd, mem_priv); | |
470 | if (IS_ERR(ia->ri_bind_mem)) { | |
471 | printk(KERN_ALERT "%s: ib_get_dma_mr for " | |
472 | "phys register failed with %lX\n\t" | |
473 | "Will continue with degraded performance\n", | |
474 | __func__, PTR_ERR(ia->ri_bind_mem)); | |
475 | memreg = RPCRDMA_REGISTER; | |
476 | ia->ri_bind_mem = NULL; | |
477 | } | |
478 | } | |
479 | ||
480 | /* Else will do memory reg/dereg for each chunk */ | |
481 | ia->ri_memreg_strategy = memreg; | |
482 | ||
483 | return 0; | |
484 | out2: | |
485 | rdma_destroy_id(ia->ri_id); | |
486 | out1: | |
487 | return rc; | |
488 | } | |
489 | ||
490 | /* | |
491 | * Clean up/close an IA. | |
492 | * o if event handles and PD have been initialized, free them. | |
493 | * o close the IA | |
494 | */ | |
495 | void | |
496 | rpcrdma_ia_close(struct rpcrdma_ia *ia) | |
497 | { | |
498 | int rc; | |
499 | ||
500 | dprintk("RPC: %s: entering\n", __func__); | |
501 | if (ia->ri_bind_mem != NULL) { | |
502 | rc = ib_dereg_mr(ia->ri_bind_mem); | |
503 | dprintk("RPC: %s: ib_dereg_mr returned %i\n", | |
504 | __func__, rc); | |
505 | } | |
506 | if (ia->ri_id != NULL && !IS_ERR(ia->ri_id) && ia->ri_id->qp) | |
507 | rdma_destroy_qp(ia->ri_id); | |
508 | if (ia->ri_pd != NULL && !IS_ERR(ia->ri_pd)) { | |
509 | rc = ib_dealloc_pd(ia->ri_pd); | |
510 | dprintk("RPC: %s: ib_dealloc_pd returned %i\n", | |
511 | __func__, rc); | |
512 | } | |
513 | if (ia->ri_id != NULL && !IS_ERR(ia->ri_id)) | |
514 | rdma_destroy_id(ia->ri_id); | |
515 | } | |
516 | ||
517 | /* | |
518 | * Create unconnected endpoint. | |
519 | */ | |
520 | int | |
521 | rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia, | |
522 | struct rpcrdma_create_data_internal *cdata) | |
523 | { | |
524 | struct ib_device_attr devattr; | |
5d40a8a5 | 525 | int rc, err; |
c56c65fb TT |
526 | |
527 | rc = ib_query_device(ia->ri_id->device, &devattr); | |
528 | if (rc) { | |
529 | dprintk("RPC: %s: ib_query_device failed %d\n", | |
530 | __func__, rc); | |
531 | return rc; | |
532 | } | |
533 | ||
534 | /* check provider's send/recv wr limits */ | |
535 | if (cdata->max_requests > devattr.max_qp_wr) | |
536 | cdata->max_requests = devattr.max_qp_wr; | |
537 | ||
538 | ep->rep_attr.event_handler = rpcrdma_qp_async_error_upcall; | |
539 | ep->rep_attr.qp_context = ep; | |
540 | /* send_cq and recv_cq initialized below */ | |
541 | ep->rep_attr.srq = NULL; | |
542 | ep->rep_attr.cap.max_send_wr = cdata->max_requests; | |
543 | switch (ia->ri_memreg_strategy) { | |
544 | case RPCRDMA_MEMWINDOWS_ASYNC: | |
545 | case RPCRDMA_MEMWINDOWS: | |
546 | /* Add room for mw_binds+unbinds - overkill! */ | |
547 | ep->rep_attr.cap.max_send_wr++; | |
548 | ep->rep_attr.cap.max_send_wr *= (2 * RPCRDMA_MAX_SEGS); | |
549 | if (ep->rep_attr.cap.max_send_wr > devattr.max_qp_wr) | |
550 | return -EINVAL; | |
551 | break; | |
552 | default: | |
553 | break; | |
554 | } | |
555 | ep->rep_attr.cap.max_recv_wr = cdata->max_requests; | |
556 | ep->rep_attr.cap.max_send_sge = (cdata->padding ? 4 : 2); | |
557 | ep->rep_attr.cap.max_recv_sge = 1; | |
558 | ep->rep_attr.cap.max_inline_data = 0; | |
559 | ep->rep_attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
560 | ep->rep_attr.qp_type = IB_QPT_RC; | |
561 | ep->rep_attr.port_num = ~0; | |
562 | ||
563 | dprintk("RPC: %s: requested max: dtos: send %d recv %d; " | |
564 | "iovs: send %d recv %d\n", | |
565 | __func__, | |
566 | ep->rep_attr.cap.max_send_wr, | |
567 | ep->rep_attr.cap.max_recv_wr, | |
568 | ep->rep_attr.cap.max_send_sge, | |
569 | ep->rep_attr.cap.max_recv_sge); | |
570 | ||
571 | /* set trigger for requesting send completion */ | |
572 | ep->rep_cqinit = ep->rep_attr.cap.max_send_wr/2 /* - 1*/; | |
573 | switch (ia->ri_memreg_strategy) { | |
574 | case RPCRDMA_MEMWINDOWS_ASYNC: | |
575 | case RPCRDMA_MEMWINDOWS: | |
576 | ep->rep_cqinit -= RPCRDMA_MAX_SEGS; | |
577 | break; | |
578 | default: | |
579 | break; | |
580 | } | |
581 | if (ep->rep_cqinit <= 2) | |
582 | ep->rep_cqinit = 0; | |
583 | INIT_CQCOUNT(ep); | |
584 | ep->rep_ia = ia; | |
585 | init_waitqueue_head(&ep->rep_connect_wait); | |
586 | ||
587 | /* | |
588 | * Create a single cq for receive dto and mw_bind (only ever | |
589 | * care about unbind, really). Send completions are suppressed. | |
590 | * Use single threaded tasklet upcalls to maintain ordering. | |
591 | */ | |
592 | ep->rep_cq = ib_create_cq(ia->ri_id->device, rpcrdma_cq_event_upcall, | |
593 | rpcrdma_cq_async_error_upcall, NULL, | |
594 | ep->rep_attr.cap.max_recv_wr + | |
595 | ep->rep_attr.cap.max_send_wr + 1, 0); | |
596 | if (IS_ERR(ep->rep_cq)) { | |
597 | rc = PTR_ERR(ep->rep_cq); | |
598 | dprintk("RPC: %s: ib_create_cq failed: %i\n", | |
599 | __func__, rc); | |
600 | goto out1; | |
601 | } | |
602 | ||
603 | rc = ib_req_notify_cq(ep->rep_cq, IB_CQ_NEXT_COMP); | |
604 | if (rc) { | |
605 | dprintk("RPC: %s: ib_req_notify_cq failed: %i\n", | |
606 | __func__, rc); | |
607 | goto out2; | |
608 | } | |
609 | ||
610 | ep->rep_attr.send_cq = ep->rep_cq; | |
611 | ep->rep_attr.recv_cq = ep->rep_cq; | |
612 | ||
613 | /* Initialize cma parameters */ | |
614 | ||
615 | /* RPC/RDMA does not use private data */ | |
616 | ep->rep_remote_cma.private_data = NULL; | |
617 | ep->rep_remote_cma.private_data_len = 0; | |
618 | ||
619 | /* Client offers RDMA Read but does not initiate */ | |
620 | switch (ia->ri_memreg_strategy) { | |
621 | case RPCRDMA_BOUNCEBUFFERS: | |
622 | ep->rep_remote_cma.responder_resources = 0; | |
623 | break; | |
624 | case RPCRDMA_MTHCAFMR: | |
625 | case RPCRDMA_REGISTER: | |
626 | ep->rep_remote_cma.responder_resources = cdata->max_requests * | |
627 | (RPCRDMA_MAX_DATA_SEGS / 8); | |
628 | break; | |
629 | case RPCRDMA_MEMWINDOWS: | |
630 | case RPCRDMA_MEMWINDOWS_ASYNC: | |
631 | #if RPCRDMA_PERSISTENT_REGISTRATION | |
632 | case RPCRDMA_ALLPHYSICAL: | |
633 | #endif | |
634 | ep->rep_remote_cma.responder_resources = cdata->max_requests * | |
635 | (RPCRDMA_MAX_DATA_SEGS / 2); | |
636 | break; | |
637 | default: | |
638 | break; | |
639 | } | |
640 | if (ep->rep_remote_cma.responder_resources > devattr.max_qp_rd_atom) | |
641 | ep->rep_remote_cma.responder_resources = devattr.max_qp_rd_atom; | |
642 | ep->rep_remote_cma.initiator_depth = 0; | |
643 | ||
644 | ep->rep_remote_cma.retry_count = 7; | |
645 | ep->rep_remote_cma.flow_control = 0; | |
646 | ep->rep_remote_cma.rnr_retry_count = 0; | |
647 | ||
648 | return 0; | |
649 | ||
650 | out2: | |
5d40a8a5 CL |
651 | err = ib_destroy_cq(ep->rep_cq); |
652 | if (err) | |
653 | dprintk("RPC: %s: ib_destroy_cq returned %i\n", | |
654 | __func__, err); | |
c56c65fb TT |
655 | out1: |
656 | return rc; | |
657 | } | |
658 | ||
659 | /* | |
660 | * rpcrdma_ep_destroy | |
661 | * | |
662 | * Disconnect and destroy endpoint. After this, the only | |
663 | * valid operations on the ep are to free it (if dynamically | |
664 | * allocated) or re-create it. | |
665 | * | |
666 | * The caller's error handling must be sure to not leak the endpoint | |
667 | * if this function fails. | |
668 | */ | |
669 | int | |
670 | rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) | |
671 | { | |
672 | int rc; | |
673 | ||
674 | dprintk("RPC: %s: entering, connected is %d\n", | |
675 | __func__, ep->rep_connected); | |
676 | ||
677 | if (ia->ri_id->qp) { | |
678 | rc = rpcrdma_ep_disconnect(ep, ia); | |
679 | if (rc) | |
680 | dprintk("RPC: %s: rpcrdma_ep_disconnect" | |
681 | " returned %i\n", __func__, rc); | |
682 | } | |
683 | ||
684 | ep->rep_func = NULL; | |
685 | ||
686 | /* padding - could be done in rpcrdma_buffer_destroy... */ | |
687 | if (ep->rep_pad_mr) { | |
688 | rpcrdma_deregister_internal(ia, ep->rep_pad_mr, &ep->rep_pad); | |
689 | ep->rep_pad_mr = NULL; | |
690 | } | |
691 | ||
692 | if (ia->ri_id->qp) { | |
693 | rdma_destroy_qp(ia->ri_id); | |
694 | ia->ri_id->qp = NULL; | |
695 | } | |
696 | ||
697 | rpcrdma_clean_cq(ep->rep_cq); | |
698 | rc = ib_destroy_cq(ep->rep_cq); | |
699 | if (rc) | |
700 | dprintk("RPC: %s: ib_destroy_cq returned %i\n", | |
701 | __func__, rc); | |
702 | ||
703 | return rc; | |
704 | } | |
705 | ||
706 | /* | |
707 | * Connect unconnected endpoint. | |
708 | */ | |
709 | int | |
710 | rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) | |
711 | { | |
712 | struct rdma_cm_id *id; | |
713 | int rc = 0; | |
714 | int retry_count = 0; | |
715 | int reconnect = (ep->rep_connected != 0); | |
716 | ||
717 | if (reconnect) { | |
718 | struct rpcrdma_xprt *xprt; | |
719 | retry: | |
720 | rc = rpcrdma_ep_disconnect(ep, ia); | |
721 | if (rc && rc != -ENOTCONN) | |
722 | dprintk("RPC: %s: rpcrdma_ep_disconnect" | |
723 | " status %i\n", __func__, rc); | |
724 | rpcrdma_clean_cq(ep->rep_cq); | |
725 | ||
726 | xprt = container_of(ia, struct rpcrdma_xprt, rx_ia); | |
727 | id = rpcrdma_create_id(xprt, ia, | |
728 | (struct sockaddr *)&xprt->rx_data.addr); | |
729 | if (IS_ERR(id)) { | |
730 | rc = PTR_ERR(id); | |
731 | goto out; | |
732 | } | |
733 | /* TEMP TEMP TEMP - fail if new device: | |
734 | * Deregister/remarshal *all* requests! | |
735 | * Close and recreate adapter, pd, etc! | |
736 | * Re-determine all attributes still sane! | |
737 | * More stuff I haven't thought of! | |
738 | * Rrrgh! | |
739 | */ | |
740 | if (ia->ri_id->device != id->device) { | |
741 | printk("RPC: %s: can't reconnect on " | |
742 | "different device!\n", __func__); | |
743 | rdma_destroy_id(id); | |
744 | rc = -ENETDOWN; | |
745 | goto out; | |
746 | } | |
747 | /* END TEMP */ | |
748 | rdma_destroy_id(ia->ri_id); | |
749 | ia->ri_id = id; | |
750 | } | |
751 | ||
752 | rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr); | |
753 | if (rc) { | |
754 | dprintk("RPC: %s: rdma_create_qp failed %i\n", | |
755 | __func__, rc); | |
756 | goto out; | |
757 | } | |
758 | ||
759 | /* XXX Tavor device performs badly with 2K MTU! */ | |
760 | if (strnicmp(ia->ri_id->device->dma_device->bus->name, "pci", 3) == 0) { | |
761 | struct pci_dev *pcid = to_pci_dev(ia->ri_id->device->dma_device); | |
762 | if (pcid->device == PCI_DEVICE_ID_MELLANOX_TAVOR && | |
763 | (pcid->vendor == PCI_VENDOR_ID_MELLANOX || | |
764 | pcid->vendor == PCI_VENDOR_ID_TOPSPIN)) { | |
765 | struct ib_qp_attr attr = { | |
766 | .path_mtu = IB_MTU_1024 | |
767 | }; | |
768 | rc = ib_modify_qp(ia->ri_id->qp, &attr, IB_QP_PATH_MTU); | |
769 | } | |
770 | } | |
771 | ||
772 | /* Theoretically a client initiator_depth > 0 is not needed, | |
773 | * but many peers fail to complete the connection unless they | |
774 | * == responder_resources! */ | |
775 | if (ep->rep_remote_cma.initiator_depth != | |
776 | ep->rep_remote_cma.responder_resources) | |
777 | ep->rep_remote_cma.initiator_depth = | |
778 | ep->rep_remote_cma.responder_resources; | |
779 | ||
780 | ep->rep_connected = 0; | |
781 | ||
782 | rc = rdma_connect(ia->ri_id, &ep->rep_remote_cma); | |
783 | if (rc) { | |
784 | dprintk("RPC: %s: rdma_connect() failed with %i\n", | |
785 | __func__, rc); | |
786 | goto out; | |
787 | } | |
788 | ||
789 | if (reconnect) | |
790 | return 0; | |
791 | ||
792 | wait_event_interruptible(ep->rep_connect_wait, ep->rep_connected != 0); | |
793 | ||
794 | /* | |
795 | * Check state. A non-peer reject indicates no listener | |
796 | * (ECONNREFUSED), which may be a transient state. All | |
797 | * others indicate a transport condition which has already | |
798 | * undergone a best-effort. | |
799 | */ | |
800 | if (ep->rep_connected == -ECONNREFUSED | |
801 | && ++retry_count <= RDMA_CONNECT_RETRY_MAX) { | |
802 | dprintk("RPC: %s: non-peer_reject, retry\n", __func__); | |
803 | goto retry; | |
804 | } | |
805 | if (ep->rep_connected <= 0) { | |
806 | /* Sometimes, the only way to reliably connect to remote | |
807 | * CMs is to use same nonzero values for ORD and IRD. */ | |
808 | ep->rep_remote_cma.initiator_depth = | |
809 | ep->rep_remote_cma.responder_resources; | |
810 | if (ep->rep_remote_cma.initiator_depth == 0) | |
811 | ++ep->rep_remote_cma.initiator_depth; | |
812 | if (ep->rep_remote_cma.responder_resources == 0) | |
813 | ++ep->rep_remote_cma.responder_resources; | |
814 | if (retry_count++ == 0) | |
815 | goto retry; | |
816 | rc = ep->rep_connected; | |
817 | } else { | |
818 | dprintk("RPC: %s: connected\n", __func__); | |
819 | } | |
820 | ||
821 | out: | |
822 | if (rc) | |
823 | ep->rep_connected = rc; | |
824 | return rc; | |
825 | } | |
826 | ||
827 | /* | |
828 | * rpcrdma_ep_disconnect | |
829 | * | |
830 | * This is separate from destroy to facilitate the ability | |
831 | * to reconnect without recreating the endpoint. | |
832 | * | |
833 | * This call is not reentrant, and must not be made in parallel | |
834 | * on the same endpoint. | |
835 | */ | |
836 | int | |
837 | rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) | |
838 | { | |
839 | int rc; | |
840 | ||
841 | rpcrdma_clean_cq(ep->rep_cq); | |
842 | rc = rdma_disconnect(ia->ri_id); | |
843 | if (!rc) { | |
844 | /* returns without wait if not connected */ | |
845 | wait_event_interruptible(ep->rep_connect_wait, | |
846 | ep->rep_connected != 1); | |
847 | dprintk("RPC: %s: after wait, %sconnected\n", __func__, | |
848 | (ep->rep_connected == 1) ? "still " : "dis"); | |
849 | } else { | |
850 | dprintk("RPC: %s: rdma_disconnect %i\n", __func__, rc); | |
851 | ep->rep_connected = rc; | |
852 | } | |
853 | return rc; | |
854 | } | |
855 | ||
856 | /* | |
857 | * Initialize buffer memory | |
858 | */ | |
859 | int | |
860 | rpcrdma_buffer_create(struct rpcrdma_buffer *buf, struct rpcrdma_ep *ep, | |
861 | struct rpcrdma_ia *ia, struct rpcrdma_create_data_internal *cdata) | |
862 | { | |
863 | char *p; | |
864 | size_t len; | |
865 | int i, rc; | |
866 | ||
867 | buf->rb_max_requests = cdata->max_requests; | |
868 | spin_lock_init(&buf->rb_lock); | |
869 | atomic_set(&buf->rb_credits, 1); | |
870 | ||
871 | /* Need to allocate: | |
872 | * 1. arrays for send and recv pointers | |
873 | * 2. arrays of struct rpcrdma_req to fill in pointers | |
874 | * 3. array of struct rpcrdma_rep for replies | |
875 | * 4. padding, if any | |
876 | * 5. mw's, if any | |
877 | * Send/recv buffers in req/rep need to be registered | |
878 | */ | |
879 | ||
880 | len = buf->rb_max_requests * | |
881 | (sizeof(struct rpcrdma_req *) + sizeof(struct rpcrdma_rep *)); | |
882 | len += cdata->padding; | |
883 | switch (ia->ri_memreg_strategy) { | |
884 | case RPCRDMA_MTHCAFMR: | |
885 | /* TBD we are perhaps overallocating here */ | |
886 | len += (buf->rb_max_requests + 1) * RPCRDMA_MAX_SEGS * | |
887 | sizeof(struct rpcrdma_mw); | |
888 | break; | |
889 | case RPCRDMA_MEMWINDOWS_ASYNC: | |
890 | case RPCRDMA_MEMWINDOWS: | |
891 | len += (buf->rb_max_requests + 1) * RPCRDMA_MAX_SEGS * | |
892 | sizeof(struct rpcrdma_mw); | |
893 | break; | |
894 | default: | |
895 | break; | |
896 | } | |
897 | ||
898 | /* allocate 1, 4 and 5 in one shot */ | |
899 | p = kzalloc(len, GFP_KERNEL); | |
900 | if (p == NULL) { | |
901 | dprintk("RPC: %s: req_t/rep_t/pad kzalloc(%zd) failed\n", | |
902 | __func__, len); | |
903 | rc = -ENOMEM; | |
904 | goto out; | |
905 | } | |
906 | buf->rb_pool = p; /* for freeing it later */ | |
907 | ||
908 | buf->rb_send_bufs = (struct rpcrdma_req **) p; | |
909 | p = (char *) &buf->rb_send_bufs[buf->rb_max_requests]; | |
910 | buf->rb_recv_bufs = (struct rpcrdma_rep **) p; | |
911 | p = (char *) &buf->rb_recv_bufs[buf->rb_max_requests]; | |
912 | ||
913 | /* | |
914 | * Register the zeroed pad buffer, if any. | |
915 | */ | |
916 | if (cdata->padding) { | |
917 | rc = rpcrdma_register_internal(ia, p, cdata->padding, | |
918 | &ep->rep_pad_mr, &ep->rep_pad); | |
919 | if (rc) | |
920 | goto out; | |
921 | } | |
922 | p += cdata->padding; | |
923 | ||
924 | /* | |
925 | * Allocate the fmr's, or mw's for mw_bind chunk registration. | |
926 | * We "cycle" the mw's in order to minimize rkey reuse, | |
927 | * and also reduce unbind-to-bind collision. | |
928 | */ | |
929 | INIT_LIST_HEAD(&buf->rb_mws); | |
930 | switch (ia->ri_memreg_strategy) { | |
931 | case RPCRDMA_MTHCAFMR: | |
932 | { | |
933 | struct rpcrdma_mw *r = (struct rpcrdma_mw *)p; | |
934 | struct ib_fmr_attr fa = { | |
935 | RPCRDMA_MAX_DATA_SEGS, 1, PAGE_SHIFT | |
936 | }; | |
937 | /* TBD we are perhaps overallocating here */ | |
938 | for (i = (buf->rb_max_requests+1) * RPCRDMA_MAX_SEGS; i; i--) { | |
939 | r->r.fmr = ib_alloc_fmr(ia->ri_pd, | |
940 | IB_ACCESS_REMOTE_WRITE | IB_ACCESS_REMOTE_READ, | |
941 | &fa); | |
942 | if (IS_ERR(r->r.fmr)) { | |
943 | rc = PTR_ERR(r->r.fmr); | |
944 | dprintk("RPC: %s: ib_alloc_fmr" | |
945 | " failed %i\n", __func__, rc); | |
946 | goto out; | |
947 | } | |
948 | list_add(&r->mw_list, &buf->rb_mws); | |
949 | ++r; | |
950 | } | |
951 | } | |
952 | break; | |
953 | case RPCRDMA_MEMWINDOWS_ASYNC: | |
954 | case RPCRDMA_MEMWINDOWS: | |
955 | { | |
956 | struct rpcrdma_mw *r = (struct rpcrdma_mw *)p; | |
957 | /* Allocate one extra request's worth, for full cycling */ | |
958 | for (i = (buf->rb_max_requests+1) * RPCRDMA_MAX_SEGS; i; i--) { | |
959 | r->r.mw = ib_alloc_mw(ia->ri_pd); | |
960 | if (IS_ERR(r->r.mw)) { | |
961 | rc = PTR_ERR(r->r.mw); | |
962 | dprintk("RPC: %s: ib_alloc_mw" | |
963 | " failed %i\n", __func__, rc); | |
964 | goto out; | |
965 | } | |
966 | list_add(&r->mw_list, &buf->rb_mws); | |
967 | ++r; | |
968 | } | |
969 | } | |
970 | break; | |
971 | default: | |
972 | break; | |
973 | } | |
974 | ||
975 | /* | |
976 | * Allocate/init the request/reply buffers. Doing this | |
977 | * using kmalloc for now -- one for each buf. | |
978 | */ | |
979 | for (i = 0; i < buf->rb_max_requests; i++) { | |
980 | struct rpcrdma_req *req; | |
981 | struct rpcrdma_rep *rep; | |
982 | ||
983 | len = cdata->inline_wsize + sizeof(struct rpcrdma_req); | |
984 | /* RPC layer requests *double* size + 1K RPC_SLACK_SPACE! */ | |
985 | /* Typical ~2400b, so rounding up saves work later */ | |
986 | if (len < 4096) | |
987 | len = 4096; | |
988 | req = kmalloc(len, GFP_KERNEL); | |
989 | if (req == NULL) { | |
990 | dprintk("RPC: %s: request buffer %d alloc" | |
991 | " failed\n", __func__, i); | |
992 | rc = -ENOMEM; | |
993 | goto out; | |
994 | } | |
995 | memset(req, 0, sizeof(struct rpcrdma_req)); | |
996 | buf->rb_send_bufs[i] = req; | |
997 | buf->rb_send_bufs[i]->rl_buffer = buf; | |
998 | ||
999 | rc = rpcrdma_register_internal(ia, req->rl_base, | |
1000 | len - offsetof(struct rpcrdma_req, rl_base), | |
1001 | &buf->rb_send_bufs[i]->rl_handle, | |
1002 | &buf->rb_send_bufs[i]->rl_iov); | |
1003 | if (rc) | |
1004 | goto out; | |
1005 | ||
1006 | buf->rb_send_bufs[i]->rl_size = len-sizeof(struct rpcrdma_req); | |
1007 | ||
1008 | len = cdata->inline_rsize + sizeof(struct rpcrdma_rep); | |
1009 | rep = kmalloc(len, GFP_KERNEL); | |
1010 | if (rep == NULL) { | |
1011 | dprintk("RPC: %s: reply buffer %d alloc failed\n", | |
1012 | __func__, i); | |
1013 | rc = -ENOMEM; | |
1014 | goto out; | |
1015 | } | |
1016 | memset(rep, 0, sizeof(struct rpcrdma_rep)); | |
1017 | buf->rb_recv_bufs[i] = rep; | |
1018 | buf->rb_recv_bufs[i]->rr_buffer = buf; | |
1019 | init_waitqueue_head(&rep->rr_unbind); | |
1020 | ||
1021 | rc = rpcrdma_register_internal(ia, rep->rr_base, | |
1022 | len - offsetof(struct rpcrdma_rep, rr_base), | |
1023 | &buf->rb_recv_bufs[i]->rr_handle, | |
1024 | &buf->rb_recv_bufs[i]->rr_iov); | |
1025 | if (rc) | |
1026 | goto out; | |
1027 | ||
1028 | } | |
1029 | dprintk("RPC: %s: max_requests %d\n", | |
1030 | __func__, buf->rb_max_requests); | |
1031 | /* done */ | |
1032 | return 0; | |
1033 | out: | |
1034 | rpcrdma_buffer_destroy(buf); | |
1035 | return rc; | |
1036 | } | |
1037 | ||
1038 | /* | |
1039 | * Unregister and destroy buffer memory. Need to deal with | |
1040 | * partial initialization, so it's callable from failed create. | |
1041 | * Must be called before destroying endpoint, as registrations | |
1042 | * reference it. | |
1043 | */ | |
1044 | void | |
1045 | rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf) | |
1046 | { | |
1047 | int rc, i; | |
1048 | struct rpcrdma_ia *ia = rdmab_to_ia(buf); | |
1049 | ||
1050 | /* clean up in reverse order from create | |
1051 | * 1. recv mr memory (mr free, then kfree) | |
1052 | * 1a. bind mw memory | |
1053 | * 2. send mr memory (mr free, then kfree) | |
1054 | * 3. padding (if any) [moved to rpcrdma_ep_destroy] | |
1055 | * 4. arrays | |
1056 | */ | |
1057 | dprintk("RPC: %s: entering\n", __func__); | |
1058 | ||
1059 | for (i = 0; i < buf->rb_max_requests; i++) { | |
1060 | if (buf->rb_recv_bufs && buf->rb_recv_bufs[i]) { | |
1061 | rpcrdma_deregister_internal(ia, | |
1062 | buf->rb_recv_bufs[i]->rr_handle, | |
1063 | &buf->rb_recv_bufs[i]->rr_iov); | |
1064 | kfree(buf->rb_recv_bufs[i]); | |
1065 | } | |
1066 | if (buf->rb_send_bufs && buf->rb_send_bufs[i]) { | |
1067 | while (!list_empty(&buf->rb_mws)) { | |
1068 | struct rpcrdma_mw *r; | |
1069 | r = list_entry(buf->rb_mws.next, | |
1070 | struct rpcrdma_mw, mw_list); | |
1071 | list_del(&r->mw_list); | |
1072 | switch (ia->ri_memreg_strategy) { | |
1073 | case RPCRDMA_MTHCAFMR: | |
1074 | rc = ib_dealloc_fmr(r->r.fmr); | |
1075 | if (rc) | |
1076 | dprintk("RPC: %s:" | |
1077 | " ib_dealloc_fmr" | |
1078 | " failed %i\n", | |
1079 | __func__, rc); | |
1080 | break; | |
1081 | case RPCRDMA_MEMWINDOWS_ASYNC: | |
1082 | case RPCRDMA_MEMWINDOWS: | |
1083 | rc = ib_dealloc_mw(r->r.mw); | |
1084 | if (rc) | |
1085 | dprintk("RPC: %s:" | |
1086 | " ib_dealloc_mw" | |
1087 | " failed %i\n", | |
1088 | __func__, rc); | |
1089 | break; | |
1090 | default: | |
1091 | break; | |
1092 | } | |
1093 | } | |
1094 | rpcrdma_deregister_internal(ia, | |
1095 | buf->rb_send_bufs[i]->rl_handle, | |
1096 | &buf->rb_send_bufs[i]->rl_iov); | |
1097 | kfree(buf->rb_send_bufs[i]); | |
1098 | } | |
1099 | } | |
1100 | ||
1101 | kfree(buf->rb_pool); | |
1102 | } | |
1103 | ||
1104 | /* | |
1105 | * Get a set of request/reply buffers. | |
1106 | * | |
1107 | * Reply buffer (if needed) is attached to send buffer upon return. | |
1108 | * Rule: | |
1109 | * rb_send_index and rb_recv_index MUST always be pointing to the | |
1110 | * *next* available buffer (non-NULL). They are incremented after | |
1111 | * removing buffers, and decremented *before* returning them. | |
1112 | */ | |
1113 | struct rpcrdma_req * | |
1114 | rpcrdma_buffer_get(struct rpcrdma_buffer *buffers) | |
1115 | { | |
1116 | struct rpcrdma_req *req; | |
1117 | unsigned long flags; | |
1118 | ||
1119 | spin_lock_irqsave(&buffers->rb_lock, flags); | |
1120 | if (buffers->rb_send_index == buffers->rb_max_requests) { | |
1121 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1122 | dprintk("RPC: %s: out of request buffers\n", __func__); | |
1123 | return ((struct rpcrdma_req *)NULL); | |
1124 | } | |
1125 | ||
1126 | req = buffers->rb_send_bufs[buffers->rb_send_index]; | |
1127 | if (buffers->rb_send_index < buffers->rb_recv_index) { | |
1128 | dprintk("RPC: %s: %d extra receives outstanding (ok)\n", | |
1129 | __func__, | |
1130 | buffers->rb_recv_index - buffers->rb_send_index); | |
1131 | req->rl_reply = NULL; | |
1132 | } else { | |
1133 | req->rl_reply = buffers->rb_recv_bufs[buffers->rb_recv_index]; | |
1134 | buffers->rb_recv_bufs[buffers->rb_recv_index++] = NULL; | |
1135 | } | |
1136 | buffers->rb_send_bufs[buffers->rb_send_index++] = NULL; | |
1137 | if (!list_empty(&buffers->rb_mws)) { | |
1138 | int i = RPCRDMA_MAX_SEGS - 1; | |
1139 | do { | |
1140 | struct rpcrdma_mw *r; | |
1141 | r = list_entry(buffers->rb_mws.next, | |
1142 | struct rpcrdma_mw, mw_list); | |
1143 | list_del(&r->mw_list); | |
1144 | req->rl_segments[i].mr_chunk.rl_mw = r; | |
1145 | } while (--i >= 0); | |
1146 | } | |
1147 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1148 | return req; | |
1149 | } | |
1150 | ||
1151 | /* | |
1152 | * Put request/reply buffers back into pool. | |
1153 | * Pre-decrement counter/array index. | |
1154 | */ | |
1155 | void | |
1156 | rpcrdma_buffer_put(struct rpcrdma_req *req) | |
1157 | { | |
1158 | struct rpcrdma_buffer *buffers = req->rl_buffer; | |
1159 | struct rpcrdma_ia *ia = rdmab_to_ia(buffers); | |
1160 | int i; | |
1161 | unsigned long flags; | |
1162 | ||
1163 | BUG_ON(req->rl_nchunks != 0); | |
1164 | spin_lock_irqsave(&buffers->rb_lock, flags); | |
1165 | buffers->rb_send_bufs[--buffers->rb_send_index] = req; | |
1166 | req->rl_niovs = 0; | |
1167 | if (req->rl_reply) { | |
1168 | buffers->rb_recv_bufs[--buffers->rb_recv_index] = req->rl_reply; | |
1169 | init_waitqueue_head(&req->rl_reply->rr_unbind); | |
1170 | req->rl_reply->rr_func = NULL; | |
1171 | req->rl_reply = NULL; | |
1172 | } | |
1173 | switch (ia->ri_memreg_strategy) { | |
1174 | case RPCRDMA_MTHCAFMR: | |
1175 | case RPCRDMA_MEMWINDOWS_ASYNC: | |
1176 | case RPCRDMA_MEMWINDOWS: | |
1177 | /* | |
1178 | * Cycle mw's back in reverse order, and "spin" them. | |
1179 | * This delays and scrambles reuse as much as possible. | |
1180 | */ | |
1181 | i = 1; | |
1182 | do { | |
1183 | struct rpcrdma_mw **mw; | |
1184 | mw = &req->rl_segments[i].mr_chunk.rl_mw; | |
1185 | list_add_tail(&(*mw)->mw_list, &buffers->rb_mws); | |
1186 | *mw = NULL; | |
1187 | } while (++i < RPCRDMA_MAX_SEGS); | |
1188 | list_add_tail(&req->rl_segments[0].mr_chunk.rl_mw->mw_list, | |
1189 | &buffers->rb_mws); | |
1190 | req->rl_segments[0].mr_chunk.rl_mw = NULL; | |
1191 | break; | |
1192 | default: | |
1193 | break; | |
1194 | } | |
1195 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1196 | } | |
1197 | ||
1198 | /* | |
1199 | * Recover reply buffers from pool. | |
1200 | * This happens when recovering from error conditions. | |
1201 | * Post-increment counter/array index. | |
1202 | */ | |
1203 | void | |
1204 | rpcrdma_recv_buffer_get(struct rpcrdma_req *req) | |
1205 | { | |
1206 | struct rpcrdma_buffer *buffers = req->rl_buffer; | |
1207 | unsigned long flags; | |
1208 | ||
1209 | if (req->rl_iov.length == 0) /* special case xprt_rdma_allocate() */ | |
1210 | buffers = ((struct rpcrdma_req *) buffers)->rl_buffer; | |
1211 | spin_lock_irqsave(&buffers->rb_lock, flags); | |
1212 | if (buffers->rb_recv_index < buffers->rb_max_requests) { | |
1213 | req->rl_reply = buffers->rb_recv_bufs[buffers->rb_recv_index]; | |
1214 | buffers->rb_recv_bufs[buffers->rb_recv_index++] = NULL; | |
1215 | } | |
1216 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1217 | } | |
1218 | ||
1219 | /* | |
1220 | * Put reply buffers back into pool when not attached to | |
1221 | * request. This happens in error conditions, and when | |
1222 | * aborting unbinds. Pre-decrement counter/array index. | |
1223 | */ | |
1224 | void | |
1225 | rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep) | |
1226 | { | |
1227 | struct rpcrdma_buffer *buffers = rep->rr_buffer; | |
1228 | unsigned long flags; | |
1229 | ||
1230 | rep->rr_func = NULL; | |
1231 | spin_lock_irqsave(&buffers->rb_lock, flags); | |
1232 | buffers->rb_recv_bufs[--buffers->rb_recv_index] = rep; | |
1233 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1234 | } | |
1235 | ||
1236 | /* | |
1237 | * Wrappers for internal-use kmalloc memory registration, used by buffer code. | |
1238 | */ | |
1239 | ||
1240 | int | |
1241 | rpcrdma_register_internal(struct rpcrdma_ia *ia, void *va, int len, | |
1242 | struct ib_mr **mrp, struct ib_sge *iov) | |
1243 | { | |
1244 | struct ib_phys_buf ipb; | |
1245 | struct ib_mr *mr; | |
1246 | int rc; | |
1247 | ||
1248 | /* | |
1249 | * All memory passed here was kmalloc'ed, therefore phys-contiguous. | |
1250 | */ | |
1251 | iov->addr = ib_dma_map_single(ia->ri_id->device, | |
1252 | va, len, DMA_BIDIRECTIONAL); | |
1253 | iov->length = len; | |
1254 | ||
1255 | if (ia->ri_bind_mem != NULL) { | |
1256 | *mrp = NULL; | |
1257 | iov->lkey = ia->ri_bind_mem->lkey; | |
1258 | return 0; | |
1259 | } | |
1260 | ||
1261 | ipb.addr = iov->addr; | |
1262 | ipb.size = iov->length; | |
1263 | mr = ib_reg_phys_mr(ia->ri_pd, &ipb, 1, | |
1264 | IB_ACCESS_LOCAL_WRITE, &iov->addr); | |
1265 | ||
1266 | dprintk("RPC: %s: phys convert: 0x%llx " | |
1267 | "registered 0x%llx length %d\n", | |
a56daeb7 AM |
1268 | __func__, (unsigned long long)ipb.addr, |
1269 | (unsigned long long)iov->addr, len); | |
c56c65fb TT |
1270 | |
1271 | if (IS_ERR(mr)) { | |
1272 | *mrp = NULL; | |
1273 | rc = PTR_ERR(mr); | |
1274 | dprintk("RPC: %s: failed with %i\n", __func__, rc); | |
1275 | } else { | |
1276 | *mrp = mr; | |
1277 | iov->lkey = mr->lkey; | |
1278 | rc = 0; | |
1279 | } | |
1280 | ||
1281 | return rc; | |
1282 | } | |
1283 | ||
1284 | int | |
1285 | rpcrdma_deregister_internal(struct rpcrdma_ia *ia, | |
1286 | struct ib_mr *mr, struct ib_sge *iov) | |
1287 | { | |
1288 | int rc; | |
1289 | ||
1290 | ib_dma_unmap_single(ia->ri_id->device, | |
1291 | iov->addr, iov->length, DMA_BIDIRECTIONAL); | |
1292 | ||
1293 | if (NULL == mr) | |
1294 | return 0; | |
1295 | ||
1296 | rc = ib_dereg_mr(mr); | |
1297 | if (rc) | |
1298 | dprintk("RPC: %s: ib_dereg_mr failed %i\n", __func__, rc); | |
1299 | return rc; | |
1300 | } | |
1301 | ||
1302 | /* | |
1303 | * Wrappers for chunk registration, shared by read/write chunk code. | |
1304 | */ | |
1305 | ||
1306 | static void | |
1307 | rpcrdma_map_one(struct rpcrdma_ia *ia, struct rpcrdma_mr_seg *seg, int writing) | |
1308 | { | |
1309 | seg->mr_dir = writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE; | |
1310 | seg->mr_dmalen = seg->mr_len; | |
1311 | if (seg->mr_page) | |
1312 | seg->mr_dma = ib_dma_map_page(ia->ri_id->device, | |
1313 | seg->mr_page, offset_in_page(seg->mr_offset), | |
1314 | seg->mr_dmalen, seg->mr_dir); | |
1315 | else | |
1316 | seg->mr_dma = ib_dma_map_single(ia->ri_id->device, | |
1317 | seg->mr_offset, | |
1318 | seg->mr_dmalen, seg->mr_dir); | |
1319 | } | |
1320 | ||
1321 | static void | |
1322 | rpcrdma_unmap_one(struct rpcrdma_ia *ia, struct rpcrdma_mr_seg *seg) | |
1323 | { | |
1324 | if (seg->mr_page) | |
1325 | ib_dma_unmap_page(ia->ri_id->device, | |
1326 | seg->mr_dma, seg->mr_dmalen, seg->mr_dir); | |
1327 | else | |
1328 | ib_dma_unmap_single(ia->ri_id->device, | |
1329 | seg->mr_dma, seg->mr_dmalen, seg->mr_dir); | |
1330 | } | |
1331 | ||
1332 | int | |
1333 | rpcrdma_register_external(struct rpcrdma_mr_seg *seg, | |
1334 | int nsegs, int writing, struct rpcrdma_xprt *r_xprt) | |
1335 | { | |
1336 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; | |
1337 | int mem_priv = (writing ? IB_ACCESS_REMOTE_WRITE : | |
1338 | IB_ACCESS_REMOTE_READ); | |
1339 | struct rpcrdma_mr_seg *seg1 = seg; | |
1340 | int i; | |
1341 | int rc = 0; | |
1342 | ||
1343 | switch (ia->ri_memreg_strategy) { | |
1344 | ||
1345 | #if RPCRDMA_PERSISTENT_REGISTRATION | |
1346 | case RPCRDMA_ALLPHYSICAL: | |
1347 | rpcrdma_map_one(ia, seg, writing); | |
1348 | seg->mr_rkey = ia->ri_bind_mem->rkey; | |
1349 | seg->mr_base = seg->mr_dma; | |
1350 | seg->mr_nsegs = 1; | |
1351 | nsegs = 1; | |
1352 | break; | |
1353 | #endif | |
1354 | ||
1355 | /* Registration using fast memory registration */ | |
1356 | case RPCRDMA_MTHCAFMR: | |
1357 | { | |
1358 | u64 physaddrs[RPCRDMA_MAX_DATA_SEGS]; | |
1359 | int len, pageoff = offset_in_page(seg->mr_offset); | |
1360 | seg1->mr_offset -= pageoff; /* start of page */ | |
1361 | seg1->mr_len += pageoff; | |
1362 | len = -pageoff; | |
1363 | if (nsegs > RPCRDMA_MAX_DATA_SEGS) | |
1364 | nsegs = RPCRDMA_MAX_DATA_SEGS; | |
1365 | for (i = 0; i < nsegs;) { | |
1366 | rpcrdma_map_one(ia, seg, writing); | |
1367 | physaddrs[i] = seg->mr_dma; | |
1368 | len += seg->mr_len; | |
1369 | ++seg; | |
1370 | ++i; | |
1371 | /* Check for holes */ | |
1372 | if ((i < nsegs && offset_in_page(seg->mr_offset)) || | |
1373 | offset_in_page((seg-1)->mr_offset+(seg-1)->mr_len)) | |
1374 | break; | |
1375 | } | |
1376 | nsegs = i; | |
1377 | rc = ib_map_phys_fmr(seg1->mr_chunk.rl_mw->r.fmr, | |
1378 | physaddrs, nsegs, seg1->mr_dma); | |
1379 | if (rc) { | |
1380 | dprintk("RPC: %s: failed ib_map_phys_fmr " | |
1381 | "%u@0x%llx+%i (%d)... status %i\n", __func__, | |
1382 | len, (unsigned long long)seg1->mr_dma, | |
1383 | pageoff, nsegs, rc); | |
1384 | while (nsegs--) | |
1385 | rpcrdma_unmap_one(ia, --seg); | |
1386 | } else { | |
1387 | seg1->mr_rkey = seg1->mr_chunk.rl_mw->r.fmr->rkey; | |
1388 | seg1->mr_base = seg1->mr_dma + pageoff; | |
1389 | seg1->mr_nsegs = nsegs; | |
1390 | seg1->mr_len = len; | |
1391 | } | |
1392 | } | |
1393 | break; | |
1394 | ||
1395 | /* Registration using memory windows */ | |
1396 | case RPCRDMA_MEMWINDOWS_ASYNC: | |
1397 | case RPCRDMA_MEMWINDOWS: | |
1398 | { | |
1399 | struct ib_mw_bind param; | |
1400 | rpcrdma_map_one(ia, seg, writing); | |
1401 | param.mr = ia->ri_bind_mem; | |
1402 | param.wr_id = 0ULL; /* no send cookie */ | |
1403 | param.addr = seg->mr_dma; | |
1404 | param.length = seg->mr_len; | |
1405 | param.send_flags = 0; | |
1406 | param.mw_access_flags = mem_priv; | |
1407 | ||
1408 | DECR_CQCOUNT(&r_xprt->rx_ep); | |
1409 | rc = ib_bind_mw(ia->ri_id->qp, | |
1410 | seg->mr_chunk.rl_mw->r.mw, ¶m); | |
1411 | if (rc) { | |
1412 | dprintk("RPC: %s: failed ib_bind_mw " | |
1413 | "%u@0x%llx status %i\n", | |
1414 | __func__, seg->mr_len, | |
1415 | (unsigned long long)seg->mr_dma, rc); | |
1416 | rpcrdma_unmap_one(ia, seg); | |
1417 | } else { | |
1418 | seg->mr_rkey = seg->mr_chunk.rl_mw->r.mw->rkey; | |
1419 | seg->mr_base = param.addr; | |
1420 | seg->mr_nsegs = 1; | |
1421 | nsegs = 1; | |
1422 | } | |
1423 | } | |
1424 | break; | |
1425 | ||
1426 | /* Default registration each time */ | |
1427 | default: | |
1428 | { | |
1429 | struct ib_phys_buf ipb[RPCRDMA_MAX_DATA_SEGS]; | |
1430 | int len = 0; | |
1431 | if (nsegs > RPCRDMA_MAX_DATA_SEGS) | |
1432 | nsegs = RPCRDMA_MAX_DATA_SEGS; | |
1433 | for (i = 0; i < nsegs;) { | |
1434 | rpcrdma_map_one(ia, seg, writing); | |
1435 | ipb[i].addr = seg->mr_dma; | |
1436 | ipb[i].size = seg->mr_len; | |
1437 | len += seg->mr_len; | |
1438 | ++seg; | |
1439 | ++i; | |
1440 | /* Check for holes */ | |
1441 | if ((i < nsegs && offset_in_page(seg->mr_offset)) || | |
1442 | offset_in_page((seg-1)->mr_offset+(seg-1)->mr_len)) | |
1443 | break; | |
1444 | } | |
1445 | nsegs = i; | |
1446 | seg1->mr_base = seg1->mr_dma; | |
1447 | seg1->mr_chunk.rl_mr = ib_reg_phys_mr(ia->ri_pd, | |
1448 | ipb, nsegs, mem_priv, &seg1->mr_base); | |
1449 | if (IS_ERR(seg1->mr_chunk.rl_mr)) { | |
1450 | rc = PTR_ERR(seg1->mr_chunk.rl_mr); | |
1451 | dprintk("RPC: %s: failed ib_reg_phys_mr " | |
1452 | "%u@0x%llx (%d)... status %i\n", | |
1453 | __func__, len, | |
1454 | (unsigned long long)seg1->mr_dma, nsegs, rc); | |
1455 | while (nsegs--) | |
1456 | rpcrdma_unmap_one(ia, --seg); | |
1457 | } else { | |
1458 | seg1->mr_rkey = seg1->mr_chunk.rl_mr->rkey; | |
1459 | seg1->mr_nsegs = nsegs; | |
1460 | seg1->mr_len = len; | |
1461 | } | |
1462 | } | |
1463 | break; | |
1464 | } | |
1465 | if (rc) | |
1466 | return -1; | |
1467 | ||
1468 | return nsegs; | |
1469 | } | |
1470 | ||
1471 | int | |
1472 | rpcrdma_deregister_external(struct rpcrdma_mr_seg *seg, | |
1473 | struct rpcrdma_xprt *r_xprt, void *r) | |
1474 | { | |
1475 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; | |
1476 | struct rpcrdma_mr_seg *seg1 = seg; | |
1477 | int nsegs = seg->mr_nsegs, rc; | |
1478 | ||
1479 | switch (ia->ri_memreg_strategy) { | |
1480 | ||
1481 | #if RPCRDMA_PERSISTENT_REGISTRATION | |
1482 | case RPCRDMA_ALLPHYSICAL: | |
1483 | BUG_ON(nsegs != 1); | |
1484 | rpcrdma_unmap_one(ia, seg); | |
1485 | rc = 0; | |
1486 | break; | |
1487 | #endif | |
1488 | ||
1489 | case RPCRDMA_MTHCAFMR: | |
1490 | { | |
1491 | LIST_HEAD(l); | |
1492 | list_add(&seg->mr_chunk.rl_mw->r.fmr->list, &l); | |
1493 | rc = ib_unmap_fmr(&l); | |
1494 | while (seg1->mr_nsegs--) | |
1495 | rpcrdma_unmap_one(ia, seg++); | |
1496 | } | |
1497 | if (rc) | |
1498 | dprintk("RPC: %s: failed ib_unmap_fmr," | |
1499 | " status %i\n", __func__, rc); | |
1500 | break; | |
1501 | ||
1502 | case RPCRDMA_MEMWINDOWS_ASYNC: | |
1503 | case RPCRDMA_MEMWINDOWS: | |
1504 | { | |
1505 | struct ib_mw_bind param; | |
1506 | BUG_ON(nsegs != 1); | |
1507 | param.mr = ia->ri_bind_mem; | |
1508 | param.addr = 0ULL; /* unbind */ | |
1509 | param.length = 0; | |
1510 | param.mw_access_flags = 0; | |
1511 | if (r) { | |
1512 | param.wr_id = (u64) (unsigned long) r; | |
1513 | param.send_flags = IB_SEND_SIGNALED; | |
1514 | INIT_CQCOUNT(&r_xprt->rx_ep); | |
1515 | } else { | |
1516 | param.wr_id = 0ULL; | |
1517 | param.send_flags = 0; | |
1518 | DECR_CQCOUNT(&r_xprt->rx_ep); | |
1519 | } | |
1520 | rc = ib_bind_mw(ia->ri_id->qp, | |
1521 | seg->mr_chunk.rl_mw->r.mw, ¶m); | |
1522 | rpcrdma_unmap_one(ia, seg); | |
1523 | } | |
1524 | if (rc) | |
1525 | dprintk("RPC: %s: failed ib_(un)bind_mw," | |
1526 | " status %i\n", __func__, rc); | |
1527 | else | |
1528 | r = NULL; /* will upcall on completion */ | |
1529 | break; | |
1530 | ||
1531 | default: | |
1532 | rc = ib_dereg_mr(seg1->mr_chunk.rl_mr); | |
1533 | seg1->mr_chunk.rl_mr = NULL; | |
1534 | while (seg1->mr_nsegs--) | |
1535 | rpcrdma_unmap_one(ia, seg++); | |
1536 | if (rc) | |
1537 | dprintk("RPC: %s: failed ib_dereg_mr," | |
1538 | " status %i\n", __func__, rc); | |
1539 | break; | |
1540 | } | |
1541 | if (r) { | |
1542 | struct rpcrdma_rep *rep = r; | |
1543 | void (*func)(struct rpcrdma_rep *) = rep->rr_func; | |
1544 | rep->rr_func = NULL; | |
1545 | func(rep); /* dereg done, callback now */ | |
1546 | } | |
1547 | return nsegs; | |
1548 | } | |
1549 | ||
1550 | /* | |
1551 | * Prepost any receive buffer, then post send. | |
1552 | * | |
1553 | * Receive buffer is donated to hardware, reclaimed upon recv completion. | |
1554 | */ | |
1555 | int | |
1556 | rpcrdma_ep_post(struct rpcrdma_ia *ia, | |
1557 | struct rpcrdma_ep *ep, | |
1558 | struct rpcrdma_req *req) | |
1559 | { | |
1560 | struct ib_send_wr send_wr, *send_wr_fail; | |
1561 | struct rpcrdma_rep *rep = req->rl_reply; | |
1562 | int rc; | |
1563 | ||
1564 | if (rep) { | |
1565 | rc = rpcrdma_ep_post_recv(ia, ep, rep); | |
1566 | if (rc) | |
1567 | goto out; | |
1568 | req->rl_reply = NULL; | |
1569 | } | |
1570 | ||
1571 | send_wr.next = NULL; | |
1572 | send_wr.wr_id = 0ULL; /* no send cookie */ | |
1573 | send_wr.sg_list = req->rl_send_iov; | |
1574 | send_wr.num_sge = req->rl_niovs; | |
1575 | send_wr.opcode = IB_WR_SEND; | |
c56c65fb TT |
1576 | if (send_wr.num_sge == 4) /* no need to sync any pad (constant) */ |
1577 | ib_dma_sync_single_for_device(ia->ri_id->device, | |
1578 | req->rl_send_iov[3].addr, req->rl_send_iov[3].length, | |
1579 | DMA_TO_DEVICE); | |
1580 | ib_dma_sync_single_for_device(ia->ri_id->device, | |
1581 | req->rl_send_iov[1].addr, req->rl_send_iov[1].length, | |
1582 | DMA_TO_DEVICE); | |
1583 | ib_dma_sync_single_for_device(ia->ri_id->device, | |
1584 | req->rl_send_iov[0].addr, req->rl_send_iov[0].length, | |
1585 | DMA_TO_DEVICE); | |
1586 | ||
1587 | if (DECR_CQCOUNT(ep) > 0) | |
1588 | send_wr.send_flags = 0; | |
1589 | else { /* Provider must take a send completion every now and then */ | |
1590 | INIT_CQCOUNT(ep); | |
1591 | send_wr.send_flags = IB_SEND_SIGNALED; | |
1592 | } | |
1593 | ||
1594 | rc = ib_post_send(ia->ri_id->qp, &send_wr, &send_wr_fail); | |
1595 | if (rc) | |
1596 | dprintk("RPC: %s: ib_post_send returned %i\n", __func__, | |
1597 | rc); | |
1598 | out: | |
1599 | return rc; | |
1600 | } | |
1601 | ||
1602 | /* | |
1603 | * (Re)post a receive buffer. | |
1604 | */ | |
1605 | int | |
1606 | rpcrdma_ep_post_recv(struct rpcrdma_ia *ia, | |
1607 | struct rpcrdma_ep *ep, | |
1608 | struct rpcrdma_rep *rep) | |
1609 | { | |
1610 | struct ib_recv_wr recv_wr, *recv_wr_fail; | |
1611 | int rc; | |
1612 | ||
1613 | recv_wr.next = NULL; | |
1614 | recv_wr.wr_id = (u64) (unsigned long) rep; | |
1615 | recv_wr.sg_list = &rep->rr_iov; | |
1616 | recv_wr.num_sge = 1; | |
1617 | ||
1618 | ib_dma_sync_single_for_cpu(ia->ri_id->device, | |
1619 | rep->rr_iov.addr, rep->rr_iov.length, DMA_BIDIRECTIONAL); | |
1620 | ||
1621 | DECR_CQCOUNT(ep); | |
1622 | rc = ib_post_recv(ia->ri_id->qp, &recv_wr, &recv_wr_fail); | |
1623 | ||
1624 | if (rc) | |
1625 | dprintk("RPC: %s: ib_post_recv returned %i\n", __func__, | |
1626 | rc); | |
1627 | return rc; | |
1628 | } |