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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 | ||
a6b7a407 | 50 | #include <linux/interrupt.h> |
c56c65fb | 51 | #include <linux/pci.h> /* for Tavor hack below */ |
5a0e3ad6 | 52 | #include <linux/slab.h> |
c56c65fb | 53 | |
f58851e6 TT |
54 | #include "xprt_rdma.h" |
55 | ||
c56c65fb TT |
56 | /* |
57 | * Globals/Macros | |
58 | */ | |
59 | ||
60 | #ifdef RPC_DEBUG | |
61 | # define RPCDBG_FACILITY RPCDBG_TRANS | |
62 | #endif | |
63 | ||
64 | /* | |
65 | * internal functions | |
66 | */ | |
67 | ||
68 | /* | |
69 | * handle replies in tasklet context, using a single, global list | |
70 | * rdma tasklet function -- just turn around and call the func | |
71 | * for all replies on the list | |
72 | */ | |
73 | ||
74 | static DEFINE_SPINLOCK(rpcrdma_tk_lock_g); | |
75 | static LIST_HEAD(rpcrdma_tasklets_g); | |
76 | ||
77 | static void | |
78 | rpcrdma_run_tasklet(unsigned long data) | |
79 | { | |
80 | struct rpcrdma_rep *rep; | |
81 | void (*func)(struct rpcrdma_rep *); | |
82 | unsigned long flags; | |
83 | ||
84 | data = data; | |
85 | spin_lock_irqsave(&rpcrdma_tk_lock_g, flags); | |
86 | while (!list_empty(&rpcrdma_tasklets_g)) { | |
87 | rep = list_entry(rpcrdma_tasklets_g.next, | |
88 | struct rpcrdma_rep, rr_list); | |
89 | list_del(&rep->rr_list); | |
90 | func = rep->rr_func; | |
91 | rep->rr_func = NULL; | |
92 | spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags); | |
93 | ||
94 | if (func) | |
95 | func(rep); | |
96 | else | |
97 | rpcrdma_recv_buffer_put(rep); | |
98 | ||
99 | spin_lock_irqsave(&rpcrdma_tk_lock_g, flags); | |
100 | } | |
101 | spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags); | |
102 | } | |
103 | ||
104 | static DECLARE_TASKLET(rpcrdma_tasklet_g, rpcrdma_run_tasklet, 0UL); | |
105 | ||
106 | static inline void | |
107 | rpcrdma_schedule_tasklet(struct rpcrdma_rep *rep) | |
108 | { | |
109 | unsigned long flags; | |
110 | ||
111 | spin_lock_irqsave(&rpcrdma_tk_lock_g, flags); | |
112 | list_add_tail(&rep->rr_list, &rpcrdma_tasklets_g); | |
113 | spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags); | |
114 | tasklet_schedule(&rpcrdma_tasklet_g); | |
115 | } | |
116 | ||
117 | static void | |
118 | rpcrdma_qp_async_error_upcall(struct ib_event *event, void *context) | |
119 | { | |
120 | struct rpcrdma_ep *ep = context; | |
121 | ||
122 | dprintk("RPC: %s: QP error %X on device %s ep %p\n", | |
123 | __func__, event->event, event->device->name, context); | |
124 | if (ep->rep_connected == 1) { | |
125 | ep->rep_connected = -EIO; | |
126 | ep->rep_func(ep); | |
127 | wake_up_all(&ep->rep_connect_wait); | |
128 | } | |
129 | } | |
130 | ||
131 | static void | |
132 | rpcrdma_cq_async_error_upcall(struct ib_event *event, void *context) | |
133 | { | |
134 | struct rpcrdma_ep *ep = context; | |
135 | ||
136 | dprintk("RPC: %s: CQ error %X on device %s ep %p\n", | |
137 | __func__, event->event, event->device->name, context); | |
138 | if (ep->rep_connected == 1) { | |
139 | ep->rep_connected = -EIO; | |
140 | ep->rep_func(ep); | |
141 | wake_up_all(&ep->rep_connect_wait); | |
142 | } | |
143 | } | |
144 | ||
145 | static inline | |
146 | void rpcrdma_event_process(struct ib_wc *wc) | |
147 | { | |
5c635e09 | 148 | struct rpcrdma_mw *frmr; |
c56c65fb TT |
149 | struct rpcrdma_rep *rep = |
150 | (struct rpcrdma_rep *)(unsigned long) wc->wr_id; | |
151 | ||
152 | dprintk("RPC: %s: event rep %p status %X opcode %X length %u\n", | |
153 | __func__, rep, wc->status, wc->opcode, wc->byte_len); | |
154 | ||
155 | if (!rep) /* send or bind completion that we don't care about */ | |
156 | return; | |
157 | ||
158 | if (IB_WC_SUCCESS != wc->status) { | |
5c635e09 TT |
159 | dprintk("RPC: %s: WC opcode %d status %X, connection lost\n", |
160 | __func__, wc->opcode, wc->status); | |
c56c65fb | 161 | rep->rr_len = ~0U; |
5c635e09 TT |
162 | if (wc->opcode != IB_WC_FAST_REG_MR && wc->opcode != IB_WC_LOCAL_INV) |
163 | rpcrdma_schedule_tasklet(rep); | |
c56c65fb TT |
164 | return; |
165 | } | |
166 | ||
167 | switch (wc->opcode) { | |
5c635e09 TT |
168 | case IB_WC_FAST_REG_MR: |
169 | frmr = (struct rpcrdma_mw *)(unsigned long)wc->wr_id; | |
170 | frmr->r.frmr.state = FRMR_IS_VALID; | |
171 | break; | |
172 | case IB_WC_LOCAL_INV: | |
173 | frmr = (struct rpcrdma_mw *)(unsigned long)wc->wr_id; | |
174 | frmr->r.frmr.state = FRMR_IS_INVALID; | |
175 | break; | |
c56c65fb TT |
176 | case IB_WC_RECV: |
177 | rep->rr_len = wc->byte_len; | |
178 | ib_dma_sync_single_for_cpu( | |
179 | rdmab_to_ia(rep->rr_buffer)->ri_id->device, | |
180 | rep->rr_iov.addr, rep->rr_len, DMA_FROM_DEVICE); | |
181 | /* Keep (only) the most recent credits, after check validity */ | |
182 | if (rep->rr_len >= 16) { | |
183 | struct rpcrdma_msg *p = | |
184 | (struct rpcrdma_msg *) rep->rr_base; | |
185 | unsigned int credits = ntohl(p->rm_credit); | |
186 | if (credits == 0) { | |
187 | dprintk("RPC: %s: server" | |
188 | " dropped credits to 0!\n", __func__); | |
189 | /* don't deadlock */ | |
190 | credits = 1; | |
191 | } else if (credits > rep->rr_buffer->rb_max_requests) { | |
192 | dprintk("RPC: %s: server" | |
193 | " over-crediting: %d (%d)\n", | |
194 | __func__, credits, | |
195 | rep->rr_buffer->rb_max_requests); | |
196 | credits = rep->rr_buffer->rb_max_requests; | |
197 | } | |
198 | atomic_set(&rep->rr_buffer->rb_credits, credits); | |
199 | } | |
200 | /* fall through */ | |
201 | case IB_WC_BIND_MW: | |
202 | rpcrdma_schedule_tasklet(rep); | |
203 | break; | |
204 | default: | |
205 | dprintk("RPC: %s: unexpected WC event %X\n", | |
206 | __func__, wc->opcode); | |
207 | break; | |
208 | } | |
209 | } | |
210 | ||
211 | static inline int | |
212 | rpcrdma_cq_poll(struct ib_cq *cq) | |
213 | { | |
214 | struct ib_wc wc; | |
215 | int rc; | |
216 | ||
217 | for (;;) { | |
218 | rc = ib_poll_cq(cq, 1, &wc); | |
219 | if (rc < 0) { | |
220 | dprintk("RPC: %s: ib_poll_cq failed %i\n", | |
221 | __func__, rc); | |
222 | return rc; | |
223 | } | |
224 | if (rc == 0) | |
225 | break; | |
226 | ||
227 | rpcrdma_event_process(&wc); | |
228 | } | |
229 | ||
230 | return 0; | |
231 | } | |
232 | ||
233 | /* | |
234 | * rpcrdma_cq_event_upcall | |
235 | * | |
236 | * This upcall handles recv, send, bind and unbind events. | |
237 | * It is reentrant but processes single events in order to maintain | |
238 | * ordering of receives to keep server credits. | |
239 | * | |
240 | * It is the responsibility of the scheduled tasklet to return | |
241 | * recv buffers to the pool. NOTE: this affects synchronization of | |
242 | * connection shutdown. That is, the structures required for | |
243 | * the completion of the reply handler must remain intact until | |
244 | * all memory has been reclaimed. | |
245 | * | |
246 | * Note that send events are suppressed and do not result in an upcall. | |
247 | */ | |
248 | static void | |
249 | rpcrdma_cq_event_upcall(struct ib_cq *cq, void *context) | |
250 | { | |
251 | int rc; | |
252 | ||
253 | rc = rpcrdma_cq_poll(cq); | |
254 | if (rc) | |
255 | return; | |
256 | ||
257 | rc = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); | |
258 | if (rc) { | |
259 | dprintk("RPC: %s: ib_req_notify_cq failed %i\n", | |
260 | __func__, rc); | |
261 | return; | |
262 | } | |
263 | ||
264 | rpcrdma_cq_poll(cq); | |
265 | } | |
266 | ||
267 | #ifdef RPC_DEBUG | |
268 | static const char * const conn[] = { | |
269 | "address resolved", | |
270 | "address error", | |
271 | "route resolved", | |
272 | "route error", | |
273 | "connect request", | |
274 | "connect response", | |
275 | "connect error", | |
276 | "unreachable", | |
277 | "rejected", | |
278 | "established", | |
279 | "disconnected", | |
280 | "device removal" | |
281 | }; | |
282 | #endif | |
283 | ||
284 | static int | |
285 | rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event) | |
286 | { | |
287 | struct rpcrdma_xprt *xprt = id->context; | |
288 | struct rpcrdma_ia *ia = &xprt->rx_ia; | |
289 | struct rpcrdma_ep *ep = &xprt->rx_ep; | |
ff0db049 | 290 | #ifdef RPC_DEBUG |
c56c65fb | 291 | struct sockaddr_in *addr = (struct sockaddr_in *) &ep->rep_remote_addr; |
ff0db049 | 292 | #endif |
c56c65fb TT |
293 | struct ib_qp_attr attr; |
294 | struct ib_qp_init_attr iattr; | |
295 | int connstate = 0; | |
296 | ||
297 | switch (event->event) { | |
298 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
299 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
5675add3 | 300 | ia->ri_async_rc = 0; |
c56c65fb TT |
301 | complete(&ia->ri_done); |
302 | break; | |
303 | case RDMA_CM_EVENT_ADDR_ERROR: | |
304 | ia->ri_async_rc = -EHOSTUNREACH; | |
305 | dprintk("RPC: %s: CM address resolution error, ep 0x%p\n", | |
306 | __func__, ep); | |
307 | complete(&ia->ri_done); | |
308 | break; | |
309 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
310 | ia->ri_async_rc = -ENETUNREACH; | |
311 | dprintk("RPC: %s: CM route resolution error, ep 0x%p\n", | |
312 | __func__, ep); | |
313 | complete(&ia->ri_done); | |
314 | break; | |
315 | case RDMA_CM_EVENT_ESTABLISHED: | |
316 | connstate = 1; | |
317 | ib_query_qp(ia->ri_id->qp, &attr, | |
318 | IB_QP_MAX_QP_RD_ATOMIC | IB_QP_MAX_DEST_RD_ATOMIC, | |
319 | &iattr); | |
320 | dprintk("RPC: %s: %d responder resources" | |
321 | " (%d initiator)\n", | |
322 | __func__, attr.max_dest_rd_atomic, attr.max_rd_atomic); | |
323 | goto connected; | |
324 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
325 | connstate = -ENOTCONN; | |
326 | goto connected; | |
327 | case RDMA_CM_EVENT_UNREACHABLE: | |
328 | connstate = -ENETDOWN; | |
329 | goto connected; | |
330 | case RDMA_CM_EVENT_REJECTED: | |
331 | connstate = -ECONNREFUSED; | |
332 | goto connected; | |
333 | case RDMA_CM_EVENT_DISCONNECTED: | |
334 | connstate = -ECONNABORTED; | |
335 | goto connected; | |
336 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
337 | connstate = -ENODEV; | |
338 | connected: | |
21454aaa | 339 | dprintk("RPC: %s: %s: %pI4:%u (ep 0x%p event 0x%x)\n", |
c56c65fb TT |
340 | __func__, |
341 | (event->event <= 11) ? conn[event->event] : | |
342 | "unknown connection error", | |
21454aaa | 343 | &addr->sin_addr.s_addr, |
c56c65fb TT |
344 | ntohs(addr->sin_port), |
345 | ep, event->event); | |
346 | atomic_set(&rpcx_to_rdmax(ep->rep_xprt)->rx_buf.rb_credits, 1); | |
347 | dprintk("RPC: %s: %sconnected\n", | |
348 | __func__, connstate > 0 ? "" : "dis"); | |
349 | ep->rep_connected = connstate; | |
350 | ep->rep_func(ep); | |
351 | wake_up_all(&ep->rep_connect_wait); | |
352 | break; | |
353 | default: | |
1a954051 | 354 | dprintk("RPC: %s: unexpected CM event %d\n", |
c56c65fb | 355 | __func__, event->event); |
c56c65fb TT |
356 | break; |
357 | } | |
358 | ||
b3cd8d45 TT |
359 | #ifdef RPC_DEBUG |
360 | if (connstate == 1) { | |
361 | int ird = attr.max_dest_rd_atomic; | |
362 | int tird = ep->rep_remote_cma.responder_resources; | |
21454aaa | 363 | printk(KERN_INFO "rpcrdma: connection to %pI4:%u " |
b3cd8d45 | 364 | "on %s, memreg %d slots %d ird %d%s\n", |
21454aaa | 365 | &addr->sin_addr.s_addr, |
b3cd8d45 TT |
366 | ntohs(addr->sin_port), |
367 | ia->ri_id->device->name, | |
368 | ia->ri_memreg_strategy, | |
369 | xprt->rx_buf.rb_max_requests, | |
370 | ird, ird < 4 && ird < tird / 2 ? " (low!)" : ""); | |
371 | } else if (connstate < 0) { | |
21454aaa HH |
372 | printk(KERN_INFO "rpcrdma: connection to %pI4:%u closed (%d)\n", |
373 | &addr->sin_addr.s_addr, | |
b3cd8d45 TT |
374 | ntohs(addr->sin_port), |
375 | connstate); | |
376 | } | |
377 | #endif | |
378 | ||
c56c65fb TT |
379 | return 0; |
380 | } | |
381 | ||
382 | static struct rdma_cm_id * | |
383 | rpcrdma_create_id(struct rpcrdma_xprt *xprt, | |
384 | struct rpcrdma_ia *ia, struct sockaddr *addr) | |
385 | { | |
386 | struct rdma_cm_id *id; | |
387 | int rc; | |
388 | ||
1a954051 TT |
389 | init_completion(&ia->ri_done); |
390 | ||
b26f9b99 | 391 | id = rdma_create_id(rpcrdma_conn_upcall, xprt, RDMA_PS_TCP, IB_QPT_RC); |
c56c65fb TT |
392 | if (IS_ERR(id)) { |
393 | rc = PTR_ERR(id); | |
394 | dprintk("RPC: %s: rdma_create_id() failed %i\n", | |
395 | __func__, rc); | |
396 | return id; | |
397 | } | |
398 | ||
5675add3 | 399 | ia->ri_async_rc = -ETIMEDOUT; |
c56c65fb TT |
400 | rc = rdma_resolve_addr(id, NULL, addr, RDMA_RESOLVE_TIMEOUT); |
401 | if (rc) { | |
402 | dprintk("RPC: %s: rdma_resolve_addr() failed %i\n", | |
403 | __func__, rc); | |
404 | goto out; | |
405 | } | |
5675add3 TT |
406 | wait_for_completion_interruptible_timeout(&ia->ri_done, |
407 | msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1); | |
c56c65fb TT |
408 | rc = ia->ri_async_rc; |
409 | if (rc) | |
410 | goto out; | |
411 | ||
5675add3 | 412 | ia->ri_async_rc = -ETIMEDOUT; |
c56c65fb TT |
413 | rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT); |
414 | if (rc) { | |
415 | dprintk("RPC: %s: rdma_resolve_route() failed %i\n", | |
416 | __func__, rc); | |
417 | goto out; | |
418 | } | |
5675add3 TT |
419 | wait_for_completion_interruptible_timeout(&ia->ri_done, |
420 | msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1); | |
c56c65fb TT |
421 | rc = ia->ri_async_rc; |
422 | if (rc) | |
423 | goto out; | |
424 | ||
425 | return id; | |
426 | ||
427 | out: | |
428 | rdma_destroy_id(id); | |
429 | return ERR_PTR(rc); | |
430 | } | |
431 | ||
432 | /* | |
433 | * Drain any cq, prior to teardown. | |
434 | */ | |
435 | static void | |
436 | rpcrdma_clean_cq(struct ib_cq *cq) | |
437 | { | |
438 | struct ib_wc wc; | |
439 | int count = 0; | |
440 | ||
441 | while (1 == ib_poll_cq(cq, 1, &wc)) | |
442 | ++count; | |
443 | ||
444 | if (count) | |
445 | dprintk("RPC: %s: flushed %d events (last 0x%x)\n", | |
446 | __func__, count, wc.opcode); | |
447 | } | |
448 | ||
449 | /* | |
450 | * Exported functions. | |
451 | */ | |
452 | ||
453 | /* | |
454 | * Open and initialize an Interface Adapter. | |
455 | * o initializes fields of struct rpcrdma_ia, including | |
456 | * interface and provider attributes and protection zone. | |
457 | */ | |
458 | int | |
459 | rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg) | |
460 | { | |
bd7ed1d1 TT |
461 | int rc, mem_priv; |
462 | struct ib_device_attr devattr; | |
c56c65fb TT |
463 | struct rpcrdma_ia *ia = &xprt->rx_ia; |
464 | ||
c56c65fb TT |
465 | ia->ri_id = rpcrdma_create_id(xprt, ia, addr); |
466 | if (IS_ERR(ia->ri_id)) { | |
467 | rc = PTR_ERR(ia->ri_id); | |
468 | goto out1; | |
469 | } | |
470 | ||
471 | ia->ri_pd = ib_alloc_pd(ia->ri_id->device); | |
472 | if (IS_ERR(ia->ri_pd)) { | |
473 | rc = PTR_ERR(ia->ri_pd); | |
474 | dprintk("RPC: %s: ib_alloc_pd() failed %i\n", | |
475 | __func__, rc); | |
476 | goto out2; | |
477 | } | |
478 | ||
bd7ed1d1 TT |
479 | /* |
480 | * Query the device to determine if the requested memory | |
481 | * registration strategy is supported. If it isn't, set the | |
482 | * strategy to a globally supported model. | |
483 | */ | |
484 | rc = ib_query_device(ia->ri_id->device, &devattr); | |
485 | if (rc) { | |
486 | dprintk("RPC: %s: ib_query_device failed %d\n", | |
487 | __func__, rc); | |
488 | goto out2; | |
489 | } | |
490 | ||
491 | if (devattr.device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY) { | |
492 | ia->ri_have_dma_lkey = 1; | |
493 | ia->ri_dma_lkey = ia->ri_id->device->local_dma_lkey; | |
494 | } | |
495 | ||
496 | switch (memreg) { | |
497 | case RPCRDMA_MEMWINDOWS: | |
498 | case RPCRDMA_MEMWINDOWS_ASYNC: | |
499 | if (!(devattr.device_cap_flags & IB_DEVICE_MEM_WINDOW)) { | |
500 | dprintk("RPC: %s: MEMWINDOWS registration " | |
501 | "specified but not supported by adapter, " | |
502 | "using slower RPCRDMA_REGISTER\n", | |
503 | __func__); | |
504 | memreg = RPCRDMA_REGISTER; | |
505 | } | |
506 | break; | |
507 | case RPCRDMA_MTHCAFMR: | |
508 | if (!ia->ri_id->device->alloc_fmr) { | |
509 | #if RPCRDMA_PERSISTENT_REGISTRATION | |
510 | dprintk("RPC: %s: MTHCAFMR registration " | |
511 | "specified but not supported by adapter, " | |
512 | "using riskier RPCRDMA_ALLPHYSICAL\n", | |
513 | __func__); | |
514 | memreg = RPCRDMA_ALLPHYSICAL; | |
515 | #else | |
516 | dprintk("RPC: %s: MTHCAFMR registration " | |
517 | "specified but not supported by adapter, " | |
518 | "using slower RPCRDMA_REGISTER\n", | |
519 | __func__); | |
520 | memreg = RPCRDMA_REGISTER; | |
3197d309 TT |
521 | #endif |
522 | } | |
523 | break; | |
524 | case RPCRDMA_FRMR: | |
525 | /* Requires both frmr reg and local dma lkey */ | |
526 | if ((devattr.device_cap_flags & | |
527 | (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) != | |
528 | (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) { | |
529 | #if RPCRDMA_PERSISTENT_REGISTRATION | |
530 | dprintk("RPC: %s: FRMR registration " | |
531 | "specified but not supported by adapter, " | |
532 | "using riskier RPCRDMA_ALLPHYSICAL\n", | |
533 | __func__); | |
534 | memreg = RPCRDMA_ALLPHYSICAL; | |
535 | #else | |
536 | dprintk("RPC: %s: FRMR registration " | |
537 | "specified but not supported by adapter, " | |
538 | "using slower RPCRDMA_REGISTER\n", | |
539 | __func__); | |
540 | memreg = RPCRDMA_REGISTER; | |
bd7ed1d1 TT |
541 | #endif |
542 | } | |
543 | break; | |
544 | } | |
545 | ||
c56c65fb TT |
546 | /* |
547 | * Optionally obtain an underlying physical identity mapping in | |
548 | * order to do a memory window-based bind. This base registration | |
549 | * is protected from remote access - that is enabled only by binding | |
550 | * for the specific bytes targeted during each RPC operation, and | |
551 | * revoked after the corresponding completion similar to a storage | |
552 | * adapter. | |
553 | */ | |
bd7ed1d1 TT |
554 | switch (memreg) { |
555 | case RPCRDMA_BOUNCEBUFFERS: | |
556 | case RPCRDMA_REGISTER: | |
3197d309 | 557 | case RPCRDMA_FRMR: |
bd7ed1d1 | 558 | break; |
c56c65fb | 559 | #if RPCRDMA_PERSISTENT_REGISTRATION |
bd7ed1d1 TT |
560 | case RPCRDMA_ALLPHYSICAL: |
561 | mem_priv = IB_ACCESS_LOCAL_WRITE | | |
562 | IB_ACCESS_REMOTE_WRITE | | |
563 | IB_ACCESS_REMOTE_READ; | |
564 | goto register_setup; | |
c56c65fb | 565 | #endif |
bd7ed1d1 TT |
566 | case RPCRDMA_MEMWINDOWS_ASYNC: |
567 | case RPCRDMA_MEMWINDOWS: | |
568 | mem_priv = IB_ACCESS_LOCAL_WRITE | | |
569 | IB_ACCESS_MW_BIND; | |
570 | goto register_setup; | |
571 | case RPCRDMA_MTHCAFMR: | |
572 | if (ia->ri_have_dma_lkey) | |
c56c65fb | 573 | break; |
bd7ed1d1 TT |
574 | mem_priv = IB_ACCESS_LOCAL_WRITE; |
575 | register_setup: | |
c56c65fb TT |
576 | ia->ri_bind_mem = ib_get_dma_mr(ia->ri_pd, mem_priv); |
577 | if (IS_ERR(ia->ri_bind_mem)) { | |
578 | printk(KERN_ALERT "%s: ib_get_dma_mr for " | |
579 | "phys register failed with %lX\n\t" | |
580 | "Will continue with degraded performance\n", | |
581 | __func__, PTR_ERR(ia->ri_bind_mem)); | |
582 | memreg = RPCRDMA_REGISTER; | |
583 | ia->ri_bind_mem = NULL; | |
584 | } | |
bd7ed1d1 TT |
585 | break; |
586 | default: | |
587 | printk(KERN_ERR "%s: invalid memory registration mode %d\n", | |
588 | __func__, memreg); | |
589 | rc = -EINVAL; | |
590 | goto out2; | |
c56c65fb | 591 | } |
bd7ed1d1 TT |
592 | dprintk("RPC: %s: memory registration strategy is %d\n", |
593 | __func__, memreg); | |
c56c65fb TT |
594 | |
595 | /* Else will do memory reg/dereg for each chunk */ | |
596 | ia->ri_memreg_strategy = memreg; | |
597 | ||
598 | return 0; | |
599 | out2: | |
600 | rdma_destroy_id(ia->ri_id); | |
fee08caf | 601 | ia->ri_id = NULL; |
c56c65fb TT |
602 | out1: |
603 | return rc; | |
604 | } | |
605 | ||
606 | /* | |
607 | * Clean up/close an IA. | |
608 | * o if event handles and PD have been initialized, free them. | |
609 | * o close the IA | |
610 | */ | |
611 | void | |
612 | rpcrdma_ia_close(struct rpcrdma_ia *ia) | |
613 | { | |
614 | int rc; | |
615 | ||
616 | dprintk("RPC: %s: entering\n", __func__); | |
617 | if (ia->ri_bind_mem != NULL) { | |
618 | rc = ib_dereg_mr(ia->ri_bind_mem); | |
619 | dprintk("RPC: %s: ib_dereg_mr returned %i\n", | |
620 | __func__, rc); | |
621 | } | |
fee08caf TT |
622 | if (ia->ri_id != NULL && !IS_ERR(ia->ri_id)) { |
623 | if (ia->ri_id->qp) | |
624 | rdma_destroy_qp(ia->ri_id); | |
625 | rdma_destroy_id(ia->ri_id); | |
626 | ia->ri_id = NULL; | |
627 | } | |
c56c65fb TT |
628 | if (ia->ri_pd != NULL && !IS_ERR(ia->ri_pd)) { |
629 | rc = ib_dealloc_pd(ia->ri_pd); | |
630 | dprintk("RPC: %s: ib_dealloc_pd returned %i\n", | |
631 | __func__, rc); | |
632 | } | |
c56c65fb TT |
633 | } |
634 | ||
635 | /* | |
636 | * Create unconnected endpoint. | |
637 | */ | |
638 | int | |
639 | rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia, | |
640 | struct rpcrdma_create_data_internal *cdata) | |
641 | { | |
642 | struct ib_device_attr devattr; | |
5d40a8a5 | 643 | int rc, err; |
c56c65fb TT |
644 | |
645 | rc = ib_query_device(ia->ri_id->device, &devattr); | |
646 | if (rc) { | |
647 | dprintk("RPC: %s: ib_query_device failed %d\n", | |
648 | __func__, rc); | |
649 | return rc; | |
650 | } | |
651 | ||
652 | /* check provider's send/recv wr limits */ | |
653 | if (cdata->max_requests > devattr.max_qp_wr) | |
654 | cdata->max_requests = devattr.max_qp_wr; | |
655 | ||
656 | ep->rep_attr.event_handler = rpcrdma_qp_async_error_upcall; | |
657 | ep->rep_attr.qp_context = ep; | |
658 | /* send_cq and recv_cq initialized below */ | |
659 | ep->rep_attr.srq = NULL; | |
660 | ep->rep_attr.cap.max_send_wr = cdata->max_requests; | |
661 | switch (ia->ri_memreg_strategy) { | |
3197d309 | 662 | case RPCRDMA_FRMR: |
15cdc644 TT |
663 | /* Add room for frmr register and invalidate WRs. |
664 | * 1. FRMR reg WR for head | |
665 | * 2. FRMR invalidate WR for head | |
666 | * 3. FRMR reg WR for pagelist | |
667 | * 4. FRMR invalidate WR for pagelist | |
668 | * 5. FRMR reg WR for tail | |
669 | * 6. FRMR invalidate WR for tail | |
670 | * 7. The RDMA_SEND WR | |
671 | */ | |
672 | ep->rep_attr.cap.max_send_wr *= 7; | |
673 | if (ep->rep_attr.cap.max_send_wr > devattr.max_qp_wr) { | |
674 | cdata->max_requests = devattr.max_qp_wr / 7; | |
675 | if (!cdata->max_requests) | |
676 | return -EINVAL; | |
677 | ep->rep_attr.cap.max_send_wr = cdata->max_requests * 7; | |
678 | } | |
3197d309 | 679 | break; |
c56c65fb TT |
680 | case RPCRDMA_MEMWINDOWS_ASYNC: |
681 | case RPCRDMA_MEMWINDOWS: | |
682 | /* Add room for mw_binds+unbinds - overkill! */ | |
683 | ep->rep_attr.cap.max_send_wr++; | |
684 | ep->rep_attr.cap.max_send_wr *= (2 * RPCRDMA_MAX_SEGS); | |
685 | if (ep->rep_attr.cap.max_send_wr > devattr.max_qp_wr) | |
686 | return -EINVAL; | |
687 | break; | |
688 | default: | |
689 | break; | |
690 | } | |
691 | ep->rep_attr.cap.max_recv_wr = cdata->max_requests; | |
692 | ep->rep_attr.cap.max_send_sge = (cdata->padding ? 4 : 2); | |
693 | ep->rep_attr.cap.max_recv_sge = 1; | |
694 | ep->rep_attr.cap.max_inline_data = 0; | |
695 | ep->rep_attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
696 | ep->rep_attr.qp_type = IB_QPT_RC; | |
697 | ep->rep_attr.port_num = ~0; | |
698 | ||
699 | dprintk("RPC: %s: requested max: dtos: send %d recv %d; " | |
700 | "iovs: send %d recv %d\n", | |
701 | __func__, | |
702 | ep->rep_attr.cap.max_send_wr, | |
703 | ep->rep_attr.cap.max_recv_wr, | |
704 | ep->rep_attr.cap.max_send_sge, | |
705 | ep->rep_attr.cap.max_recv_sge); | |
706 | ||
707 | /* set trigger for requesting send completion */ | |
708 | ep->rep_cqinit = ep->rep_attr.cap.max_send_wr/2 /* - 1*/; | |
709 | switch (ia->ri_memreg_strategy) { | |
710 | case RPCRDMA_MEMWINDOWS_ASYNC: | |
711 | case RPCRDMA_MEMWINDOWS: | |
712 | ep->rep_cqinit -= RPCRDMA_MAX_SEGS; | |
713 | break; | |
714 | default: | |
715 | break; | |
716 | } | |
717 | if (ep->rep_cqinit <= 2) | |
718 | ep->rep_cqinit = 0; | |
719 | INIT_CQCOUNT(ep); | |
720 | ep->rep_ia = ia; | |
721 | init_waitqueue_head(&ep->rep_connect_wait); | |
722 | ||
723 | /* | |
724 | * Create a single cq for receive dto and mw_bind (only ever | |
725 | * care about unbind, really). Send completions are suppressed. | |
726 | * Use single threaded tasklet upcalls to maintain ordering. | |
727 | */ | |
728 | ep->rep_cq = ib_create_cq(ia->ri_id->device, rpcrdma_cq_event_upcall, | |
729 | rpcrdma_cq_async_error_upcall, NULL, | |
730 | ep->rep_attr.cap.max_recv_wr + | |
731 | ep->rep_attr.cap.max_send_wr + 1, 0); | |
732 | if (IS_ERR(ep->rep_cq)) { | |
733 | rc = PTR_ERR(ep->rep_cq); | |
734 | dprintk("RPC: %s: ib_create_cq failed: %i\n", | |
735 | __func__, rc); | |
736 | goto out1; | |
737 | } | |
738 | ||
739 | rc = ib_req_notify_cq(ep->rep_cq, IB_CQ_NEXT_COMP); | |
740 | if (rc) { | |
741 | dprintk("RPC: %s: ib_req_notify_cq failed: %i\n", | |
742 | __func__, rc); | |
743 | goto out2; | |
744 | } | |
745 | ||
746 | ep->rep_attr.send_cq = ep->rep_cq; | |
747 | ep->rep_attr.recv_cq = ep->rep_cq; | |
748 | ||
749 | /* Initialize cma parameters */ | |
750 | ||
751 | /* RPC/RDMA does not use private data */ | |
752 | ep->rep_remote_cma.private_data = NULL; | |
753 | ep->rep_remote_cma.private_data_len = 0; | |
754 | ||
755 | /* Client offers RDMA Read but does not initiate */ | |
b334eaab TT |
756 | ep->rep_remote_cma.initiator_depth = 0; |
757 | if (ia->ri_memreg_strategy == RPCRDMA_BOUNCEBUFFERS) | |
c56c65fb | 758 | ep->rep_remote_cma.responder_resources = 0; |
b334eaab TT |
759 | else if (devattr.max_qp_rd_atom > 32) /* arbitrary but <= 255 */ |
760 | ep->rep_remote_cma.responder_resources = 32; | |
761 | else | |
c56c65fb | 762 | ep->rep_remote_cma.responder_resources = devattr.max_qp_rd_atom; |
c56c65fb TT |
763 | |
764 | ep->rep_remote_cma.retry_count = 7; | |
765 | ep->rep_remote_cma.flow_control = 0; | |
766 | ep->rep_remote_cma.rnr_retry_count = 0; | |
767 | ||
768 | return 0; | |
769 | ||
770 | out2: | |
5d40a8a5 CL |
771 | err = ib_destroy_cq(ep->rep_cq); |
772 | if (err) | |
773 | dprintk("RPC: %s: ib_destroy_cq returned %i\n", | |
774 | __func__, err); | |
c56c65fb TT |
775 | out1: |
776 | return rc; | |
777 | } | |
778 | ||
779 | /* | |
780 | * rpcrdma_ep_destroy | |
781 | * | |
782 | * Disconnect and destroy endpoint. After this, the only | |
783 | * valid operations on the ep are to free it (if dynamically | |
784 | * allocated) or re-create it. | |
785 | * | |
786 | * The caller's error handling must be sure to not leak the endpoint | |
787 | * if this function fails. | |
788 | */ | |
789 | int | |
790 | rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) | |
791 | { | |
792 | int rc; | |
793 | ||
794 | dprintk("RPC: %s: entering, connected is %d\n", | |
795 | __func__, ep->rep_connected); | |
796 | ||
797 | if (ia->ri_id->qp) { | |
798 | rc = rpcrdma_ep_disconnect(ep, ia); | |
799 | if (rc) | |
800 | dprintk("RPC: %s: rpcrdma_ep_disconnect" | |
801 | " returned %i\n", __func__, rc); | |
fee08caf TT |
802 | rdma_destroy_qp(ia->ri_id); |
803 | ia->ri_id->qp = NULL; | |
c56c65fb TT |
804 | } |
805 | ||
c56c65fb TT |
806 | /* padding - could be done in rpcrdma_buffer_destroy... */ |
807 | if (ep->rep_pad_mr) { | |
808 | rpcrdma_deregister_internal(ia, ep->rep_pad_mr, &ep->rep_pad); | |
809 | ep->rep_pad_mr = NULL; | |
810 | } | |
811 | ||
c56c65fb TT |
812 | rpcrdma_clean_cq(ep->rep_cq); |
813 | rc = ib_destroy_cq(ep->rep_cq); | |
814 | if (rc) | |
815 | dprintk("RPC: %s: ib_destroy_cq returned %i\n", | |
816 | __func__, rc); | |
817 | ||
818 | return rc; | |
819 | } | |
820 | ||
821 | /* | |
822 | * Connect unconnected endpoint. | |
823 | */ | |
824 | int | |
825 | rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) | |
826 | { | |
827 | struct rdma_cm_id *id; | |
828 | int rc = 0; | |
829 | int retry_count = 0; | |
c56c65fb | 830 | |
c055551e | 831 | if (ep->rep_connected != 0) { |
c56c65fb TT |
832 | struct rpcrdma_xprt *xprt; |
833 | retry: | |
834 | rc = rpcrdma_ep_disconnect(ep, ia); | |
835 | if (rc && rc != -ENOTCONN) | |
836 | dprintk("RPC: %s: rpcrdma_ep_disconnect" | |
837 | " status %i\n", __func__, rc); | |
838 | rpcrdma_clean_cq(ep->rep_cq); | |
839 | ||
840 | xprt = container_of(ia, struct rpcrdma_xprt, rx_ia); | |
841 | id = rpcrdma_create_id(xprt, ia, | |
842 | (struct sockaddr *)&xprt->rx_data.addr); | |
843 | if (IS_ERR(id)) { | |
844 | rc = PTR_ERR(id); | |
845 | goto out; | |
846 | } | |
847 | /* TEMP TEMP TEMP - fail if new device: | |
848 | * Deregister/remarshal *all* requests! | |
849 | * Close and recreate adapter, pd, etc! | |
850 | * Re-determine all attributes still sane! | |
851 | * More stuff I haven't thought of! | |
852 | * Rrrgh! | |
853 | */ | |
854 | if (ia->ri_id->device != id->device) { | |
855 | printk("RPC: %s: can't reconnect on " | |
856 | "different device!\n", __func__); | |
857 | rdma_destroy_id(id); | |
858 | rc = -ENETDOWN; | |
859 | goto out; | |
860 | } | |
861 | /* END TEMP */ | |
1a954051 | 862 | rdma_destroy_qp(ia->ri_id); |
c56c65fb TT |
863 | rdma_destroy_id(ia->ri_id); |
864 | ia->ri_id = id; | |
865 | } | |
866 | ||
867 | rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr); | |
868 | if (rc) { | |
869 | dprintk("RPC: %s: rdma_create_qp failed %i\n", | |
870 | __func__, rc); | |
871 | goto out; | |
872 | } | |
873 | ||
874 | /* XXX Tavor device performs badly with 2K MTU! */ | |
875 | if (strnicmp(ia->ri_id->device->dma_device->bus->name, "pci", 3) == 0) { | |
876 | struct pci_dev *pcid = to_pci_dev(ia->ri_id->device->dma_device); | |
877 | if (pcid->device == PCI_DEVICE_ID_MELLANOX_TAVOR && | |
878 | (pcid->vendor == PCI_VENDOR_ID_MELLANOX || | |
879 | pcid->vendor == PCI_VENDOR_ID_TOPSPIN)) { | |
880 | struct ib_qp_attr attr = { | |
881 | .path_mtu = IB_MTU_1024 | |
882 | }; | |
883 | rc = ib_modify_qp(ia->ri_id->qp, &attr, IB_QP_PATH_MTU); | |
884 | } | |
885 | } | |
886 | ||
c56c65fb TT |
887 | ep->rep_connected = 0; |
888 | ||
889 | rc = rdma_connect(ia->ri_id, &ep->rep_remote_cma); | |
890 | if (rc) { | |
891 | dprintk("RPC: %s: rdma_connect() failed with %i\n", | |
892 | __func__, rc); | |
893 | goto out; | |
894 | } | |
895 | ||
c56c65fb TT |
896 | wait_event_interruptible(ep->rep_connect_wait, ep->rep_connected != 0); |
897 | ||
898 | /* | |
899 | * Check state. A non-peer reject indicates no listener | |
900 | * (ECONNREFUSED), which may be a transient state. All | |
901 | * others indicate a transport condition which has already | |
902 | * undergone a best-effort. | |
903 | */ | |
f64f9e71 JP |
904 | if (ep->rep_connected == -ECONNREFUSED && |
905 | ++retry_count <= RDMA_CONNECT_RETRY_MAX) { | |
c56c65fb TT |
906 | dprintk("RPC: %s: non-peer_reject, retry\n", __func__); |
907 | goto retry; | |
908 | } | |
909 | if (ep->rep_connected <= 0) { | |
910 | /* Sometimes, the only way to reliably connect to remote | |
911 | * CMs is to use same nonzero values for ORD and IRD. */ | |
b334eaab TT |
912 | if (retry_count++ <= RDMA_CONNECT_RETRY_MAX + 1 && |
913 | (ep->rep_remote_cma.responder_resources == 0 || | |
914 | ep->rep_remote_cma.initiator_depth != | |
915 | ep->rep_remote_cma.responder_resources)) { | |
916 | if (ep->rep_remote_cma.responder_resources == 0) | |
917 | ep->rep_remote_cma.responder_resources = 1; | |
918 | ep->rep_remote_cma.initiator_depth = | |
919 | ep->rep_remote_cma.responder_resources; | |
c56c65fb | 920 | goto retry; |
b334eaab | 921 | } |
c56c65fb TT |
922 | rc = ep->rep_connected; |
923 | } else { | |
924 | dprintk("RPC: %s: connected\n", __func__); | |
925 | } | |
926 | ||
927 | out: | |
928 | if (rc) | |
929 | ep->rep_connected = rc; | |
930 | return rc; | |
931 | } | |
932 | ||
933 | /* | |
934 | * rpcrdma_ep_disconnect | |
935 | * | |
936 | * This is separate from destroy to facilitate the ability | |
937 | * to reconnect without recreating the endpoint. | |
938 | * | |
939 | * This call is not reentrant, and must not be made in parallel | |
940 | * on the same endpoint. | |
941 | */ | |
942 | int | |
943 | rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) | |
944 | { | |
945 | int rc; | |
946 | ||
947 | rpcrdma_clean_cq(ep->rep_cq); | |
948 | rc = rdma_disconnect(ia->ri_id); | |
949 | if (!rc) { | |
950 | /* returns without wait if not connected */ | |
951 | wait_event_interruptible(ep->rep_connect_wait, | |
952 | ep->rep_connected != 1); | |
953 | dprintk("RPC: %s: after wait, %sconnected\n", __func__, | |
954 | (ep->rep_connected == 1) ? "still " : "dis"); | |
955 | } else { | |
956 | dprintk("RPC: %s: rdma_disconnect %i\n", __func__, rc); | |
957 | ep->rep_connected = rc; | |
958 | } | |
959 | return rc; | |
960 | } | |
961 | ||
962 | /* | |
963 | * Initialize buffer memory | |
964 | */ | |
965 | int | |
966 | rpcrdma_buffer_create(struct rpcrdma_buffer *buf, struct rpcrdma_ep *ep, | |
967 | struct rpcrdma_ia *ia, struct rpcrdma_create_data_internal *cdata) | |
968 | { | |
969 | char *p; | |
970 | size_t len; | |
971 | int i, rc; | |
8d4ba034 | 972 | struct rpcrdma_mw *r; |
c56c65fb TT |
973 | |
974 | buf->rb_max_requests = cdata->max_requests; | |
975 | spin_lock_init(&buf->rb_lock); | |
976 | atomic_set(&buf->rb_credits, 1); | |
977 | ||
978 | /* Need to allocate: | |
979 | * 1. arrays for send and recv pointers | |
980 | * 2. arrays of struct rpcrdma_req to fill in pointers | |
981 | * 3. array of struct rpcrdma_rep for replies | |
982 | * 4. padding, if any | |
3197d309 | 983 | * 5. mw's, fmr's or frmr's, if any |
c56c65fb TT |
984 | * Send/recv buffers in req/rep need to be registered |
985 | */ | |
986 | ||
987 | len = buf->rb_max_requests * | |
988 | (sizeof(struct rpcrdma_req *) + sizeof(struct rpcrdma_rep *)); | |
989 | len += cdata->padding; | |
990 | switch (ia->ri_memreg_strategy) { | |
3197d309 TT |
991 | case RPCRDMA_FRMR: |
992 | len += buf->rb_max_requests * RPCRDMA_MAX_SEGS * | |
993 | sizeof(struct rpcrdma_mw); | |
994 | break; | |
c56c65fb TT |
995 | case RPCRDMA_MTHCAFMR: |
996 | /* TBD we are perhaps overallocating here */ | |
997 | len += (buf->rb_max_requests + 1) * RPCRDMA_MAX_SEGS * | |
998 | sizeof(struct rpcrdma_mw); | |
999 | break; | |
1000 | case RPCRDMA_MEMWINDOWS_ASYNC: | |
1001 | case RPCRDMA_MEMWINDOWS: | |
1002 | len += (buf->rb_max_requests + 1) * RPCRDMA_MAX_SEGS * | |
1003 | sizeof(struct rpcrdma_mw); | |
1004 | break; | |
1005 | default: | |
1006 | break; | |
1007 | } | |
1008 | ||
1009 | /* allocate 1, 4 and 5 in one shot */ | |
1010 | p = kzalloc(len, GFP_KERNEL); | |
1011 | if (p == NULL) { | |
1012 | dprintk("RPC: %s: req_t/rep_t/pad kzalloc(%zd) failed\n", | |
1013 | __func__, len); | |
1014 | rc = -ENOMEM; | |
1015 | goto out; | |
1016 | } | |
1017 | buf->rb_pool = p; /* for freeing it later */ | |
1018 | ||
1019 | buf->rb_send_bufs = (struct rpcrdma_req **) p; | |
1020 | p = (char *) &buf->rb_send_bufs[buf->rb_max_requests]; | |
1021 | buf->rb_recv_bufs = (struct rpcrdma_rep **) p; | |
1022 | p = (char *) &buf->rb_recv_bufs[buf->rb_max_requests]; | |
1023 | ||
1024 | /* | |
1025 | * Register the zeroed pad buffer, if any. | |
1026 | */ | |
1027 | if (cdata->padding) { | |
1028 | rc = rpcrdma_register_internal(ia, p, cdata->padding, | |
1029 | &ep->rep_pad_mr, &ep->rep_pad); | |
1030 | if (rc) | |
1031 | goto out; | |
1032 | } | |
1033 | p += cdata->padding; | |
1034 | ||
1035 | /* | |
1036 | * Allocate the fmr's, or mw's for mw_bind chunk registration. | |
1037 | * We "cycle" the mw's in order to minimize rkey reuse, | |
1038 | * and also reduce unbind-to-bind collision. | |
1039 | */ | |
1040 | INIT_LIST_HEAD(&buf->rb_mws); | |
8d4ba034 | 1041 | r = (struct rpcrdma_mw *)p; |
c56c65fb | 1042 | switch (ia->ri_memreg_strategy) { |
3197d309 TT |
1043 | case RPCRDMA_FRMR: |
1044 | for (i = buf->rb_max_requests * RPCRDMA_MAX_SEGS; i; i--) { | |
1045 | r->r.frmr.fr_mr = ib_alloc_fast_reg_mr(ia->ri_pd, | |
1046 | RPCRDMA_MAX_SEGS); | |
1047 | if (IS_ERR(r->r.frmr.fr_mr)) { | |
1048 | rc = PTR_ERR(r->r.frmr.fr_mr); | |
1049 | dprintk("RPC: %s: ib_alloc_fast_reg_mr" | |
1050 | " failed %i\n", __func__, rc); | |
1051 | goto out; | |
1052 | } | |
1053 | r->r.frmr.fr_pgl = | |
1054 | ib_alloc_fast_reg_page_list(ia->ri_id->device, | |
1055 | RPCRDMA_MAX_SEGS); | |
1056 | if (IS_ERR(r->r.frmr.fr_pgl)) { | |
1057 | rc = PTR_ERR(r->r.frmr.fr_pgl); | |
1058 | dprintk("RPC: %s: " | |
1059 | "ib_alloc_fast_reg_page_list " | |
1060 | "failed %i\n", __func__, rc); | |
1061 | goto out; | |
1062 | } | |
1063 | list_add(&r->mw_list, &buf->rb_mws); | |
1064 | ++r; | |
1065 | } | |
1066 | break; | |
c56c65fb | 1067 | case RPCRDMA_MTHCAFMR: |
c56c65fb TT |
1068 | /* TBD we are perhaps overallocating here */ |
1069 | for (i = (buf->rb_max_requests+1) * RPCRDMA_MAX_SEGS; i; i--) { | |
8d4ba034 TT |
1070 | static struct ib_fmr_attr fa = |
1071 | { RPCRDMA_MAX_DATA_SEGS, 1, PAGE_SHIFT }; | |
c56c65fb TT |
1072 | r->r.fmr = ib_alloc_fmr(ia->ri_pd, |
1073 | IB_ACCESS_REMOTE_WRITE | IB_ACCESS_REMOTE_READ, | |
1074 | &fa); | |
1075 | if (IS_ERR(r->r.fmr)) { | |
1076 | rc = PTR_ERR(r->r.fmr); | |
1077 | dprintk("RPC: %s: ib_alloc_fmr" | |
1078 | " failed %i\n", __func__, rc); | |
1079 | goto out; | |
1080 | } | |
1081 | list_add(&r->mw_list, &buf->rb_mws); | |
1082 | ++r; | |
1083 | } | |
c56c65fb TT |
1084 | break; |
1085 | case RPCRDMA_MEMWINDOWS_ASYNC: | |
1086 | case RPCRDMA_MEMWINDOWS: | |
c56c65fb TT |
1087 | /* Allocate one extra request's worth, for full cycling */ |
1088 | for (i = (buf->rb_max_requests+1) * RPCRDMA_MAX_SEGS; i; i--) { | |
7083e42e | 1089 | r->r.mw = ib_alloc_mw(ia->ri_pd, IB_MW_TYPE_1); |
c56c65fb TT |
1090 | if (IS_ERR(r->r.mw)) { |
1091 | rc = PTR_ERR(r->r.mw); | |
1092 | dprintk("RPC: %s: ib_alloc_mw" | |
1093 | " failed %i\n", __func__, rc); | |
1094 | goto out; | |
1095 | } | |
1096 | list_add(&r->mw_list, &buf->rb_mws); | |
1097 | ++r; | |
1098 | } | |
c56c65fb TT |
1099 | break; |
1100 | default: | |
1101 | break; | |
1102 | } | |
1103 | ||
1104 | /* | |
1105 | * Allocate/init the request/reply buffers. Doing this | |
1106 | * using kmalloc for now -- one for each buf. | |
1107 | */ | |
1108 | for (i = 0; i < buf->rb_max_requests; i++) { | |
1109 | struct rpcrdma_req *req; | |
1110 | struct rpcrdma_rep *rep; | |
1111 | ||
1112 | len = cdata->inline_wsize + sizeof(struct rpcrdma_req); | |
1113 | /* RPC layer requests *double* size + 1K RPC_SLACK_SPACE! */ | |
1114 | /* Typical ~2400b, so rounding up saves work later */ | |
1115 | if (len < 4096) | |
1116 | len = 4096; | |
1117 | req = kmalloc(len, GFP_KERNEL); | |
1118 | if (req == NULL) { | |
1119 | dprintk("RPC: %s: request buffer %d alloc" | |
1120 | " failed\n", __func__, i); | |
1121 | rc = -ENOMEM; | |
1122 | goto out; | |
1123 | } | |
1124 | memset(req, 0, sizeof(struct rpcrdma_req)); | |
1125 | buf->rb_send_bufs[i] = req; | |
1126 | buf->rb_send_bufs[i]->rl_buffer = buf; | |
1127 | ||
1128 | rc = rpcrdma_register_internal(ia, req->rl_base, | |
1129 | len - offsetof(struct rpcrdma_req, rl_base), | |
1130 | &buf->rb_send_bufs[i]->rl_handle, | |
1131 | &buf->rb_send_bufs[i]->rl_iov); | |
1132 | if (rc) | |
1133 | goto out; | |
1134 | ||
1135 | buf->rb_send_bufs[i]->rl_size = len-sizeof(struct rpcrdma_req); | |
1136 | ||
1137 | len = cdata->inline_rsize + sizeof(struct rpcrdma_rep); | |
1138 | rep = kmalloc(len, GFP_KERNEL); | |
1139 | if (rep == NULL) { | |
1140 | dprintk("RPC: %s: reply buffer %d alloc failed\n", | |
1141 | __func__, i); | |
1142 | rc = -ENOMEM; | |
1143 | goto out; | |
1144 | } | |
1145 | memset(rep, 0, sizeof(struct rpcrdma_rep)); | |
1146 | buf->rb_recv_bufs[i] = rep; | |
1147 | buf->rb_recv_bufs[i]->rr_buffer = buf; | |
1148 | init_waitqueue_head(&rep->rr_unbind); | |
1149 | ||
1150 | rc = rpcrdma_register_internal(ia, rep->rr_base, | |
1151 | len - offsetof(struct rpcrdma_rep, rr_base), | |
1152 | &buf->rb_recv_bufs[i]->rr_handle, | |
1153 | &buf->rb_recv_bufs[i]->rr_iov); | |
1154 | if (rc) | |
1155 | goto out; | |
1156 | ||
1157 | } | |
1158 | dprintk("RPC: %s: max_requests %d\n", | |
1159 | __func__, buf->rb_max_requests); | |
1160 | /* done */ | |
1161 | return 0; | |
1162 | out: | |
1163 | rpcrdma_buffer_destroy(buf); | |
1164 | return rc; | |
1165 | } | |
1166 | ||
1167 | /* | |
1168 | * Unregister and destroy buffer memory. Need to deal with | |
1169 | * partial initialization, so it's callable from failed create. | |
1170 | * Must be called before destroying endpoint, as registrations | |
1171 | * reference it. | |
1172 | */ | |
1173 | void | |
1174 | rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf) | |
1175 | { | |
1176 | int rc, i; | |
1177 | struct rpcrdma_ia *ia = rdmab_to_ia(buf); | |
8d4ba034 | 1178 | struct rpcrdma_mw *r; |
c56c65fb TT |
1179 | |
1180 | /* clean up in reverse order from create | |
1181 | * 1. recv mr memory (mr free, then kfree) | |
1182 | * 1a. bind mw memory | |
1183 | * 2. send mr memory (mr free, then kfree) | |
1184 | * 3. padding (if any) [moved to rpcrdma_ep_destroy] | |
1185 | * 4. arrays | |
1186 | */ | |
1187 | dprintk("RPC: %s: entering\n", __func__); | |
1188 | ||
1189 | for (i = 0; i < buf->rb_max_requests; i++) { | |
1190 | if (buf->rb_recv_bufs && buf->rb_recv_bufs[i]) { | |
1191 | rpcrdma_deregister_internal(ia, | |
1192 | buf->rb_recv_bufs[i]->rr_handle, | |
1193 | &buf->rb_recv_bufs[i]->rr_iov); | |
1194 | kfree(buf->rb_recv_bufs[i]); | |
1195 | } | |
1196 | if (buf->rb_send_bufs && buf->rb_send_bufs[i]) { | |
1197 | while (!list_empty(&buf->rb_mws)) { | |
c56c65fb TT |
1198 | r = list_entry(buf->rb_mws.next, |
1199 | struct rpcrdma_mw, mw_list); | |
1200 | list_del(&r->mw_list); | |
1201 | switch (ia->ri_memreg_strategy) { | |
3197d309 TT |
1202 | case RPCRDMA_FRMR: |
1203 | rc = ib_dereg_mr(r->r.frmr.fr_mr); | |
1204 | if (rc) | |
1205 | dprintk("RPC: %s:" | |
1206 | " ib_dereg_mr" | |
1207 | " failed %i\n", | |
1208 | __func__, rc); | |
1209 | ib_free_fast_reg_page_list(r->r.frmr.fr_pgl); | |
1210 | break; | |
c56c65fb TT |
1211 | case RPCRDMA_MTHCAFMR: |
1212 | rc = ib_dealloc_fmr(r->r.fmr); | |
1213 | if (rc) | |
1214 | dprintk("RPC: %s:" | |
1215 | " ib_dealloc_fmr" | |
1216 | " failed %i\n", | |
1217 | __func__, rc); | |
1218 | break; | |
1219 | case RPCRDMA_MEMWINDOWS_ASYNC: | |
1220 | case RPCRDMA_MEMWINDOWS: | |
1221 | rc = ib_dealloc_mw(r->r.mw); | |
1222 | if (rc) | |
1223 | dprintk("RPC: %s:" | |
1224 | " ib_dealloc_mw" | |
1225 | " failed %i\n", | |
1226 | __func__, rc); | |
1227 | break; | |
1228 | default: | |
1229 | break; | |
1230 | } | |
1231 | } | |
1232 | rpcrdma_deregister_internal(ia, | |
1233 | buf->rb_send_bufs[i]->rl_handle, | |
1234 | &buf->rb_send_bufs[i]->rl_iov); | |
1235 | kfree(buf->rb_send_bufs[i]); | |
1236 | } | |
1237 | } | |
1238 | ||
1239 | kfree(buf->rb_pool); | |
1240 | } | |
1241 | ||
1242 | /* | |
1243 | * Get a set of request/reply buffers. | |
1244 | * | |
1245 | * Reply buffer (if needed) is attached to send buffer upon return. | |
1246 | * Rule: | |
1247 | * rb_send_index and rb_recv_index MUST always be pointing to the | |
1248 | * *next* available buffer (non-NULL). They are incremented after | |
1249 | * removing buffers, and decremented *before* returning them. | |
1250 | */ | |
1251 | struct rpcrdma_req * | |
1252 | rpcrdma_buffer_get(struct rpcrdma_buffer *buffers) | |
1253 | { | |
1254 | struct rpcrdma_req *req; | |
1255 | unsigned long flags; | |
8d4ba034 TT |
1256 | int i; |
1257 | struct rpcrdma_mw *r; | |
c56c65fb TT |
1258 | |
1259 | spin_lock_irqsave(&buffers->rb_lock, flags); | |
1260 | if (buffers->rb_send_index == buffers->rb_max_requests) { | |
1261 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1262 | dprintk("RPC: %s: out of request buffers\n", __func__); | |
1263 | return ((struct rpcrdma_req *)NULL); | |
1264 | } | |
1265 | ||
1266 | req = buffers->rb_send_bufs[buffers->rb_send_index]; | |
1267 | if (buffers->rb_send_index < buffers->rb_recv_index) { | |
1268 | dprintk("RPC: %s: %d extra receives outstanding (ok)\n", | |
1269 | __func__, | |
1270 | buffers->rb_recv_index - buffers->rb_send_index); | |
1271 | req->rl_reply = NULL; | |
1272 | } else { | |
1273 | req->rl_reply = buffers->rb_recv_bufs[buffers->rb_recv_index]; | |
1274 | buffers->rb_recv_bufs[buffers->rb_recv_index++] = NULL; | |
1275 | } | |
1276 | buffers->rb_send_bufs[buffers->rb_send_index++] = NULL; | |
1277 | if (!list_empty(&buffers->rb_mws)) { | |
8d4ba034 | 1278 | i = RPCRDMA_MAX_SEGS - 1; |
c56c65fb | 1279 | do { |
c56c65fb TT |
1280 | r = list_entry(buffers->rb_mws.next, |
1281 | struct rpcrdma_mw, mw_list); | |
1282 | list_del(&r->mw_list); | |
1283 | req->rl_segments[i].mr_chunk.rl_mw = r; | |
1284 | } while (--i >= 0); | |
1285 | } | |
1286 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1287 | return req; | |
1288 | } | |
1289 | ||
1290 | /* | |
1291 | * Put request/reply buffers back into pool. | |
1292 | * Pre-decrement counter/array index. | |
1293 | */ | |
1294 | void | |
1295 | rpcrdma_buffer_put(struct rpcrdma_req *req) | |
1296 | { | |
1297 | struct rpcrdma_buffer *buffers = req->rl_buffer; | |
1298 | struct rpcrdma_ia *ia = rdmab_to_ia(buffers); | |
1299 | int i; | |
1300 | unsigned long flags; | |
1301 | ||
1302 | BUG_ON(req->rl_nchunks != 0); | |
1303 | spin_lock_irqsave(&buffers->rb_lock, flags); | |
1304 | buffers->rb_send_bufs[--buffers->rb_send_index] = req; | |
1305 | req->rl_niovs = 0; | |
1306 | if (req->rl_reply) { | |
1307 | buffers->rb_recv_bufs[--buffers->rb_recv_index] = req->rl_reply; | |
1308 | init_waitqueue_head(&req->rl_reply->rr_unbind); | |
1309 | req->rl_reply->rr_func = NULL; | |
1310 | req->rl_reply = NULL; | |
1311 | } | |
1312 | switch (ia->ri_memreg_strategy) { | |
3197d309 | 1313 | case RPCRDMA_FRMR: |
c56c65fb TT |
1314 | case RPCRDMA_MTHCAFMR: |
1315 | case RPCRDMA_MEMWINDOWS_ASYNC: | |
1316 | case RPCRDMA_MEMWINDOWS: | |
1317 | /* | |
1318 | * Cycle mw's back in reverse order, and "spin" them. | |
1319 | * This delays and scrambles reuse as much as possible. | |
1320 | */ | |
1321 | i = 1; | |
1322 | do { | |
1323 | struct rpcrdma_mw **mw; | |
1324 | mw = &req->rl_segments[i].mr_chunk.rl_mw; | |
1325 | list_add_tail(&(*mw)->mw_list, &buffers->rb_mws); | |
1326 | *mw = NULL; | |
1327 | } while (++i < RPCRDMA_MAX_SEGS); | |
1328 | list_add_tail(&req->rl_segments[0].mr_chunk.rl_mw->mw_list, | |
1329 | &buffers->rb_mws); | |
1330 | req->rl_segments[0].mr_chunk.rl_mw = NULL; | |
1331 | break; | |
1332 | default: | |
1333 | break; | |
1334 | } | |
1335 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1336 | } | |
1337 | ||
1338 | /* | |
1339 | * Recover reply buffers from pool. | |
1340 | * This happens when recovering from error conditions. | |
1341 | * Post-increment counter/array index. | |
1342 | */ | |
1343 | void | |
1344 | rpcrdma_recv_buffer_get(struct rpcrdma_req *req) | |
1345 | { | |
1346 | struct rpcrdma_buffer *buffers = req->rl_buffer; | |
1347 | unsigned long flags; | |
1348 | ||
1349 | if (req->rl_iov.length == 0) /* special case xprt_rdma_allocate() */ | |
1350 | buffers = ((struct rpcrdma_req *) buffers)->rl_buffer; | |
1351 | spin_lock_irqsave(&buffers->rb_lock, flags); | |
1352 | if (buffers->rb_recv_index < buffers->rb_max_requests) { | |
1353 | req->rl_reply = buffers->rb_recv_bufs[buffers->rb_recv_index]; | |
1354 | buffers->rb_recv_bufs[buffers->rb_recv_index++] = NULL; | |
1355 | } | |
1356 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1357 | } | |
1358 | ||
1359 | /* | |
1360 | * Put reply buffers back into pool when not attached to | |
1361 | * request. This happens in error conditions, and when | |
1362 | * aborting unbinds. Pre-decrement counter/array index. | |
1363 | */ | |
1364 | void | |
1365 | rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep) | |
1366 | { | |
1367 | struct rpcrdma_buffer *buffers = rep->rr_buffer; | |
1368 | unsigned long flags; | |
1369 | ||
1370 | rep->rr_func = NULL; | |
1371 | spin_lock_irqsave(&buffers->rb_lock, flags); | |
1372 | buffers->rb_recv_bufs[--buffers->rb_recv_index] = rep; | |
1373 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1374 | } | |
1375 | ||
1376 | /* | |
1377 | * Wrappers for internal-use kmalloc memory registration, used by buffer code. | |
1378 | */ | |
1379 | ||
1380 | int | |
1381 | rpcrdma_register_internal(struct rpcrdma_ia *ia, void *va, int len, | |
1382 | struct ib_mr **mrp, struct ib_sge *iov) | |
1383 | { | |
1384 | struct ib_phys_buf ipb; | |
1385 | struct ib_mr *mr; | |
1386 | int rc; | |
1387 | ||
1388 | /* | |
1389 | * All memory passed here was kmalloc'ed, therefore phys-contiguous. | |
1390 | */ | |
1391 | iov->addr = ib_dma_map_single(ia->ri_id->device, | |
1392 | va, len, DMA_BIDIRECTIONAL); | |
1393 | iov->length = len; | |
1394 | ||
bd7ed1d1 TT |
1395 | if (ia->ri_have_dma_lkey) { |
1396 | *mrp = NULL; | |
1397 | iov->lkey = ia->ri_dma_lkey; | |
1398 | return 0; | |
1399 | } else if (ia->ri_bind_mem != NULL) { | |
c56c65fb TT |
1400 | *mrp = NULL; |
1401 | iov->lkey = ia->ri_bind_mem->lkey; | |
1402 | return 0; | |
1403 | } | |
1404 | ||
1405 | ipb.addr = iov->addr; | |
1406 | ipb.size = iov->length; | |
1407 | mr = ib_reg_phys_mr(ia->ri_pd, &ipb, 1, | |
1408 | IB_ACCESS_LOCAL_WRITE, &iov->addr); | |
1409 | ||
1410 | dprintk("RPC: %s: phys convert: 0x%llx " | |
1411 | "registered 0x%llx length %d\n", | |
a56daeb7 AM |
1412 | __func__, (unsigned long long)ipb.addr, |
1413 | (unsigned long long)iov->addr, len); | |
c56c65fb TT |
1414 | |
1415 | if (IS_ERR(mr)) { | |
1416 | *mrp = NULL; | |
1417 | rc = PTR_ERR(mr); | |
1418 | dprintk("RPC: %s: failed with %i\n", __func__, rc); | |
1419 | } else { | |
1420 | *mrp = mr; | |
1421 | iov->lkey = mr->lkey; | |
1422 | rc = 0; | |
1423 | } | |
1424 | ||
1425 | return rc; | |
1426 | } | |
1427 | ||
1428 | int | |
1429 | rpcrdma_deregister_internal(struct rpcrdma_ia *ia, | |
1430 | struct ib_mr *mr, struct ib_sge *iov) | |
1431 | { | |
1432 | int rc; | |
1433 | ||
1434 | ib_dma_unmap_single(ia->ri_id->device, | |
1435 | iov->addr, iov->length, DMA_BIDIRECTIONAL); | |
1436 | ||
1437 | if (NULL == mr) | |
1438 | return 0; | |
1439 | ||
1440 | rc = ib_dereg_mr(mr); | |
1441 | if (rc) | |
1442 | dprintk("RPC: %s: ib_dereg_mr failed %i\n", __func__, rc); | |
1443 | return rc; | |
1444 | } | |
1445 | ||
1446 | /* | |
1447 | * Wrappers for chunk registration, shared by read/write chunk code. | |
1448 | */ | |
1449 | ||
1450 | static void | |
1451 | rpcrdma_map_one(struct rpcrdma_ia *ia, struct rpcrdma_mr_seg *seg, int writing) | |
1452 | { | |
1453 | seg->mr_dir = writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE; | |
1454 | seg->mr_dmalen = seg->mr_len; | |
1455 | if (seg->mr_page) | |
1456 | seg->mr_dma = ib_dma_map_page(ia->ri_id->device, | |
1457 | seg->mr_page, offset_in_page(seg->mr_offset), | |
1458 | seg->mr_dmalen, seg->mr_dir); | |
1459 | else | |
1460 | seg->mr_dma = ib_dma_map_single(ia->ri_id->device, | |
1461 | seg->mr_offset, | |
1462 | seg->mr_dmalen, seg->mr_dir); | |
5c635e09 TT |
1463 | if (ib_dma_mapping_error(ia->ri_id->device, seg->mr_dma)) { |
1464 | dprintk("RPC: %s: mr_dma %llx mr_offset %p mr_dma_len %zu\n", | |
1465 | __func__, | |
986d4abb RD |
1466 | (unsigned long long)seg->mr_dma, |
1467 | seg->mr_offset, seg->mr_dmalen); | |
5c635e09 | 1468 | } |
c56c65fb TT |
1469 | } |
1470 | ||
1471 | static void | |
1472 | rpcrdma_unmap_one(struct rpcrdma_ia *ia, struct rpcrdma_mr_seg *seg) | |
1473 | { | |
1474 | if (seg->mr_page) | |
1475 | ib_dma_unmap_page(ia->ri_id->device, | |
1476 | seg->mr_dma, seg->mr_dmalen, seg->mr_dir); | |
1477 | else | |
1478 | ib_dma_unmap_single(ia->ri_id->device, | |
1479 | seg->mr_dma, seg->mr_dmalen, seg->mr_dir); | |
1480 | } | |
1481 | ||
3197d309 TT |
1482 | static int |
1483 | rpcrdma_register_frmr_external(struct rpcrdma_mr_seg *seg, | |
1484 | int *nsegs, int writing, struct rpcrdma_ia *ia, | |
1485 | struct rpcrdma_xprt *r_xprt) | |
1486 | { | |
1487 | struct rpcrdma_mr_seg *seg1 = seg; | |
5c635e09 TT |
1488 | struct ib_send_wr invalidate_wr, frmr_wr, *bad_wr, *post_wr; |
1489 | ||
3197d309 TT |
1490 | u8 key; |
1491 | int len, pageoff; | |
1492 | int i, rc; | |
9b78145c TT |
1493 | int seg_len; |
1494 | u64 pa; | |
1495 | int page_no; | |
3197d309 TT |
1496 | |
1497 | pageoff = offset_in_page(seg1->mr_offset); | |
1498 | seg1->mr_offset -= pageoff; /* start of page */ | |
1499 | seg1->mr_len += pageoff; | |
1500 | len = -pageoff; | |
1501 | if (*nsegs > RPCRDMA_MAX_DATA_SEGS) | |
1502 | *nsegs = RPCRDMA_MAX_DATA_SEGS; | |
9b78145c | 1503 | for (page_no = i = 0; i < *nsegs;) { |
3197d309 | 1504 | rpcrdma_map_one(ia, seg, writing); |
9b78145c TT |
1505 | pa = seg->mr_dma; |
1506 | for (seg_len = seg->mr_len; seg_len > 0; seg_len -= PAGE_SIZE) { | |
1507 | seg1->mr_chunk.rl_mw->r.frmr.fr_pgl-> | |
1508 | page_list[page_no++] = pa; | |
1509 | pa += PAGE_SIZE; | |
1510 | } | |
3197d309 TT |
1511 | len += seg->mr_len; |
1512 | ++seg; | |
1513 | ++i; | |
1514 | /* Check for holes */ | |
1515 | if ((i < *nsegs && offset_in_page(seg->mr_offset)) || | |
1516 | offset_in_page((seg-1)->mr_offset + (seg-1)->mr_len)) | |
1517 | break; | |
1518 | } | |
1519 | dprintk("RPC: %s: Using frmr %p to map %d segments\n", | |
1520 | __func__, seg1->mr_chunk.rl_mw, i); | |
1521 | ||
5c635e09 TT |
1522 | if (unlikely(seg1->mr_chunk.rl_mw->r.frmr.state == FRMR_IS_VALID)) { |
1523 | dprintk("RPC: %s: frmr %x left valid, posting invalidate.\n", | |
1524 | __func__, | |
1525 | seg1->mr_chunk.rl_mw->r.frmr.fr_mr->rkey); | |
1526 | /* Invalidate before using. */ | |
1527 | memset(&invalidate_wr, 0, sizeof invalidate_wr); | |
1528 | invalidate_wr.wr_id = (unsigned long)(void *)seg1->mr_chunk.rl_mw; | |
1529 | invalidate_wr.next = &frmr_wr; | |
1530 | invalidate_wr.opcode = IB_WR_LOCAL_INV; | |
1531 | invalidate_wr.send_flags = IB_SEND_SIGNALED; | |
1532 | invalidate_wr.ex.invalidate_rkey = | |
1533 | seg1->mr_chunk.rl_mw->r.frmr.fr_mr->rkey; | |
1534 | DECR_CQCOUNT(&r_xprt->rx_ep); | |
1535 | post_wr = &invalidate_wr; | |
1536 | } else | |
1537 | post_wr = &frmr_wr; | |
1538 | ||
3197d309 TT |
1539 | /* Bump the key */ |
1540 | key = (u8)(seg1->mr_chunk.rl_mw->r.frmr.fr_mr->rkey & 0x000000FF); | |
1541 | ib_update_fast_reg_key(seg1->mr_chunk.rl_mw->r.frmr.fr_mr, ++key); | |
1542 | ||
1543 | /* Prepare FRMR WR */ | |
1544 | memset(&frmr_wr, 0, sizeof frmr_wr); | |
5c635e09 | 1545 | frmr_wr.wr_id = (unsigned long)(void *)seg1->mr_chunk.rl_mw; |
3197d309 | 1546 | frmr_wr.opcode = IB_WR_FAST_REG_MR; |
5c635e09 | 1547 | frmr_wr.send_flags = IB_SEND_SIGNALED; |
7a8b80eb | 1548 | frmr_wr.wr.fast_reg.iova_start = seg1->mr_dma; |
3197d309 | 1549 | frmr_wr.wr.fast_reg.page_list = seg1->mr_chunk.rl_mw->r.frmr.fr_pgl; |
9b78145c | 1550 | frmr_wr.wr.fast_reg.page_list_len = page_no; |
3197d309 | 1551 | frmr_wr.wr.fast_reg.page_shift = PAGE_SHIFT; |
9b78145c | 1552 | frmr_wr.wr.fast_reg.length = page_no << PAGE_SHIFT; |
5c635e09 | 1553 | BUG_ON(frmr_wr.wr.fast_reg.length < len); |
3197d309 | 1554 | frmr_wr.wr.fast_reg.access_flags = (writing ? |
68743082 VP |
1555 | IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE : |
1556 | IB_ACCESS_REMOTE_READ); | |
3197d309 TT |
1557 | frmr_wr.wr.fast_reg.rkey = seg1->mr_chunk.rl_mw->r.frmr.fr_mr->rkey; |
1558 | DECR_CQCOUNT(&r_xprt->rx_ep); | |
1559 | ||
5c635e09 | 1560 | rc = ib_post_send(ia->ri_id->qp, post_wr, &bad_wr); |
3197d309 TT |
1561 | |
1562 | if (rc) { | |
1563 | dprintk("RPC: %s: failed ib_post_send for register," | |
1564 | " status %i\n", __func__, rc); | |
1565 | while (i--) | |
1566 | rpcrdma_unmap_one(ia, --seg); | |
1567 | } else { | |
1568 | seg1->mr_rkey = seg1->mr_chunk.rl_mw->r.frmr.fr_mr->rkey; | |
1569 | seg1->mr_base = seg1->mr_dma + pageoff; | |
1570 | seg1->mr_nsegs = i; | |
1571 | seg1->mr_len = len; | |
1572 | } | |
1573 | *nsegs = i; | |
1574 | return rc; | |
1575 | } | |
1576 | ||
1577 | static int | |
1578 | rpcrdma_deregister_frmr_external(struct rpcrdma_mr_seg *seg, | |
1579 | struct rpcrdma_ia *ia, struct rpcrdma_xprt *r_xprt) | |
1580 | { | |
1581 | struct rpcrdma_mr_seg *seg1 = seg; | |
1582 | struct ib_send_wr invalidate_wr, *bad_wr; | |
1583 | int rc; | |
1584 | ||
1585 | while (seg1->mr_nsegs--) | |
1586 | rpcrdma_unmap_one(ia, seg++); | |
1587 | ||
1588 | memset(&invalidate_wr, 0, sizeof invalidate_wr); | |
5c635e09 | 1589 | invalidate_wr.wr_id = (unsigned long)(void *)seg1->mr_chunk.rl_mw; |
3197d309 | 1590 | invalidate_wr.opcode = IB_WR_LOCAL_INV; |
5c635e09 | 1591 | invalidate_wr.send_flags = IB_SEND_SIGNALED; |
3197d309 TT |
1592 | invalidate_wr.ex.invalidate_rkey = seg1->mr_chunk.rl_mw->r.frmr.fr_mr->rkey; |
1593 | DECR_CQCOUNT(&r_xprt->rx_ep); | |
1594 | ||
1595 | rc = ib_post_send(ia->ri_id->qp, &invalidate_wr, &bad_wr); | |
1596 | if (rc) | |
1597 | dprintk("RPC: %s: failed ib_post_send for invalidate," | |
1598 | " status %i\n", __func__, rc); | |
1599 | return rc; | |
1600 | } | |
1601 | ||
8d4ba034 TT |
1602 | static int |
1603 | rpcrdma_register_fmr_external(struct rpcrdma_mr_seg *seg, | |
1604 | int *nsegs, int writing, struct rpcrdma_ia *ia) | |
1605 | { | |
1606 | struct rpcrdma_mr_seg *seg1 = seg; | |
1607 | u64 physaddrs[RPCRDMA_MAX_DATA_SEGS]; | |
1608 | int len, pageoff, i, rc; | |
1609 | ||
1610 | pageoff = offset_in_page(seg1->mr_offset); | |
1611 | seg1->mr_offset -= pageoff; /* start of page */ | |
1612 | seg1->mr_len += pageoff; | |
1613 | len = -pageoff; | |
1614 | if (*nsegs > RPCRDMA_MAX_DATA_SEGS) | |
1615 | *nsegs = RPCRDMA_MAX_DATA_SEGS; | |
1616 | for (i = 0; i < *nsegs;) { | |
1617 | rpcrdma_map_one(ia, seg, writing); | |
1618 | physaddrs[i] = seg->mr_dma; | |
1619 | len += seg->mr_len; | |
1620 | ++seg; | |
1621 | ++i; | |
1622 | /* Check for holes */ | |
1623 | if ((i < *nsegs && offset_in_page(seg->mr_offset)) || | |
1624 | offset_in_page((seg-1)->mr_offset + (seg-1)->mr_len)) | |
1625 | break; | |
1626 | } | |
1627 | rc = ib_map_phys_fmr(seg1->mr_chunk.rl_mw->r.fmr, | |
1628 | physaddrs, i, seg1->mr_dma); | |
1629 | if (rc) { | |
1630 | dprintk("RPC: %s: failed ib_map_phys_fmr " | |
1631 | "%u@0x%llx+%i (%d)... status %i\n", __func__, | |
1632 | len, (unsigned long long)seg1->mr_dma, | |
1633 | pageoff, i, rc); | |
1634 | while (i--) | |
1635 | rpcrdma_unmap_one(ia, --seg); | |
1636 | } else { | |
1637 | seg1->mr_rkey = seg1->mr_chunk.rl_mw->r.fmr->rkey; | |
1638 | seg1->mr_base = seg1->mr_dma + pageoff; | |
1639 | seg1->mr_nsegs = i; | |
1640 | seg1->mr_len = len; | |
1641 | } | |
1642 | *nsegs = i; | |
1643 | return rc; | |
1644 | } | |
1645 | ||
1646 | static int | |
1647 | rpcrdma_deregister_fmr_external(struct rpcrdma_mr_seg *seg, | |
1648 | struct rpcrdma_ia *ia) | |
1649 | { | |
1650 | struct rpcrdma_mr_seg *seg1 = seg; | |
1651 | LIST_HEAD(l); | |
1652 | int rc; | |
1653 | ||
1654 | list_add(&seg1->mr_chunk.rl_mw->r.fmr->list, &l); | |
1655 | rc = ib_unmap_fmr(&l); | |
1656 | while (seg1->mr_nsegs--) | |
1657 | rpcrdma_unmap_one(ia, seg++); | |
1658 | if (rc) | |
1659 | dprintk("RPC: %s: failed ib_unmap_fmr," | |
1660 | " status %i\n", __func__, rc); | |
1661 | return rc; | |
1662 | } | |
1663 | ||
1664 | static int | |
1665 | rpcrdma_register_memwin_external(struct rpcrdma_mr_seg *seg, | |
1666 | int *nsegs, int writing, struct rpcrdma_ia *ia, | |
1667 | struct rpcrdma_xprt *r_xprt) | |
1668 | { | |
1669 | int mem_priv = (writing ? IB_ACCESS_REMOTE_WRITE : | |
1670 | IB_ACCESS_REMOTE_READ); | |
1671 | struct ib_mw_bind param; | |
1672 | int rc; | |
1673 | ||
1674 | *nsegs = 1; | |
1675 | rpcrdma_map_one(ia, seg, writing); | |
7083e42e | 1676 | param.bind_info.mr = ia->ri_bind_mem; |
8d4ba034 | 1677 | param.wr_id = 0ULL; /* no send cookie */ |
7083e42e SM |
1678 | param.bind_info.addr = seg->mr_dma; |
1679 | param.bind_info.length = seg->mr_len; | |
8d4ba034 | 1680 | param.send_flags = 0; |
7083e42e | 1681 | param.bind_info.mw_access_flags = mem_priv; |
8d4ba034 TT |
1682 | |
1683 | DECR_CQCOUNT(&r_xprt->rx_ep); | |
1684 | rc = ib_bind_mw(ia->ri_id->qp, seg->mr_chunk.rl_mw->r.mw, ¶m); | |
1685 | if (rc) { | |
1686 | dprintk("RPC: %s: failed ib_bind_mw " | |
1687 | "%u@0x%llx status %i\n", | |
1688 | __func__, seg->mr_len, | |
1689 | (unsigned long long)seg->mr_dma, rc); | |
1690 | rpcrdma_unmap_one(ia, seg); | |
1691 | } else { | |
1692 | seg->mr_rkey = seg->mr_chunk.rl_mw->r.mw->rkey; | |
7083e42e | 1693 | seg->mr_base = param.bind_info.addr; |
8d4ba034 TT |
1694 | seg->mr_nsegs = 1; |
1695 | } | |
1696 | return rc; | |
1697 | } | |
1698 | ||
1699 | static int | |
1700 | rpcrdma_deregister_memwin_external(struct rpcrdma_mr_seg *seg, | |
1701 | struct rpcrdma_ia *ia, | |
1702 | struct rpcrdma_xprt *r_xprt, void **r) | |
1703 | { | |
1704 | struct ib_mw_bind param; | |
1705 | LIST_HEAD(l); | |
1706 | int rc; | |
1707 | ||
1708 | BUG_ON(seg->mr_nsegs != 1); | |
7083e42e SM |
1709 | param.bind_info.mr = ia->ri_bind_mem; |
1710 | param.bind_info.addr = 0ULL; /* unbind */ | |
1711 | param.bind_info.length = 0; | |
1712 | param.bind_info.mw_access_flags = 0; | |
8d4ba034 TT |
1713 | if (*r) { |
1714 | param.wr_id = (u64) (unsigned long) *r; | |
1715 | param.send_flags = IB_SEND_SIGNALED; | |
1716 | INIT_CQCOUNT(&r_xprt->rx_ep); | |
1717 | } else { | |
1718 | param.wr_id = 0ULL; | |
1719 | param.send_flags = 0; | |
1720 | DECR_CQCOUNT(&r_xprt->rx_ep); | |
1721 | } | |
1722 | rc = ib_bind_mw(ia->ri_id->qp, seg->mr_chunk.rl_mw->r.mw, ¶m); | |
1723 | rpcrdma_unmap_one(ia, seg); | |
1724 | if (rc) | |
1725 | dprintk("RPC: %s: failed ib_(un)bind_mw," | |
1726 | " status %i\n", __func__, rc); | |
1727 | else | |
1728 | *r = NULL; /* will upcall on completion */ | |
1729 | return rc; | |
1730 | } | |
1731 | ||
1732 | static int | |
1733 | rpcrdma_register_default_external(struct rpcrdma_mr_seg *seg, | |
1734 | int *nsegs, int writing, struct rpcrdma_ia *ia) | |
1735 | { | |
1736 | int mem_priv = (writing ? IB_ACCESS_REMOTE_WRITE : | |
1737 | IB_ACCESS_REMOTE_READ); | |
1738 | struct rpcrdma_mr_seg *seg1 = seg; | |
1739 | struct ib_phys_buf ipb[RPCRDMA_MAX_DATA_SEGS]; | |
1740 | int len, i, rc = 0; | |
1741 | ||
1742 | if (*nsegs > RPCRDMA_MAX_DATA_SEGS) | |
1743 | *nsegs = RPCRDMA_MAX_DATA_SEGS; | |
1744 | for (len = 0, i = 0; i < *nsegs;) { | |
1745 | rpcrdma_map_one(ia, seg, writing); | |
1746 | ipb[i].addr = seg->mr_dma; | |
1747 | ipb[i].size = seg->mr_len; | |
1748 | len += seg->mr_len; | |
1749 | ++seg; | |
1750 | ++i; | |
1751 | /* Check for holes */ | |
1752 | if ((i < *nsegs && offset_in_page(seg->mr_offset)) || | |
1753 | offset_in_page((seg-1)->mr_offset+(seg-1)->mr_len)) | |
1754 | break; | |
1755 | } | |
1756 | seg1->mr_base = seg1->mr_dma; | |
1757 | seg1->mr_chunk.rl_mr = ib_reg_phys_mr(ia->ri_pd, | |
1758 | ipb, i, mem_priv, &seg1->mr_base); | |
1759 | if (IS_ERR(seg1->mr_chunk.rl_mr)) { | |
1760 | rc = PTR_ERR(seg1->mr_chunk.rl_mr); | |
1761 | dprintk("RPC: %s: failed ib_reg_phys_mr " | |
1762 | "%u@0x%llx (%d)... status %i\n", | |
1763 | __func__, len, | |
1764 | (unsigned long long)seg1->mr_dma, i, rc); | |
1765 | while (i--) | |
1766 | rpcrdma_unmap_one(ia, --seg); | |
1767 | } else { | |
1768 | seg1->mr_rkey = seg1->mr_chunk.rl_mr->rkey; | |
1769 | seg1->mr_nsegs = i; | |
1770 | seg1->mr_len = len; | |
1771 | } | |
1772 | *nsegs = i; | |
1773 | return rc; | |
1774 | } | |
1775 | ||
1776 | static int | |
1777 | rpcrdma_deregister_default_external(struct rpcrdma_mr_seg *seg, | |
1778 | struct rpcrdma_ia *ia) | |
1779 | { | |
1780 | struct rpcrdma_mr_seg *seg1 = seg; | |
1781 | int rc; | |
1782 | ||
1783 | rc = ib_dereg_mr(seg1->mr_chunk.rl_mr); | |
1784 | seg1->mr_chunk.rl_mr = NULL; | |
1785 | while (seg1->mr_nsegs--) | |
1786 | rpcrdma_unmap_one(ia, seg++); | |
1787 | if (rc) | |
1788 | dprintk("RPC: %s: failed ib_dereg_mr," | |
1789 | " status %i\n", __func__, rc); | |
1790 | return rc; | |
1791 | } | |
1792 | ||
c56c65fb TT |
1793 | int |
1794 | rpcrdma_register_external(struct rpcrdma_mr_seg *seg, | |
1795 | int nsegs, int writing, struct rpcrdma_xprt *r_xprt) | |
1796 | { | |
1797 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; | |
c56c65fb TT |
1798 | int rc = 0; |
1799 | ||
1800 | switch (ia->ri_memreg_strategy) { | |
1801 | ||
1802 | #if RPCRDMA_PERSISTENT_REGISTRATION | |
1803 | case RPCRDMA_ALLPHYSICAL: | |
1804 | rpcrdma_map_one(ia, seg, writing); | |
1805 | seg->mr_rkey = ia->ri_bind_mem->rkey; | |
1806 | seg->mr_base = seg->mr_dma; | |
1807 | seg->mr_nsegs = 1; | |
1808 | nsegs = 1; | |
1809 | break; | |
1810 | #endif | |
1811 | ||
3197d309 TT |
1812 | /* Registration using frmr registration */ |
1813 | case RPCRDMA_FRMR: | |
1814 | rc = rpcrdma_register_frmr_external(seg, &nsegs, writing, ia, r_xprt); | |
1815 | break; | |
1816 | ||
8d4ba034 | 1817 | /* Registration using fmr memory registration */ |
c56c65fb | 1818 | case RPCRDMA_MTHCAFMR: |
8d4ba034 | 1819 | rc = rpcrdma_register_fmr_external(seg, &nsegs, writing, ia); |
c56c65fb TT |
1820 | break; |
1821 | ||
1822 | /* Registration using memory windows */ | |
1823 | case RPCRDMA_MEMWINDOWS_ASYNC: | |
1824 | case RPCRDMA_MEMWINDOWS: | |
8d4ba034 | 1825 | rc = rpcrdma_register_memwin_external(seg, &nsegs, writing, ia, r_xprt); |
c56c65fb TT |
1826 | break; |
1827 | ||
1828 | /* Default registration each time */ | |
1829 | default: | |
8d4ba034 | 1830 | rc = rpcrdma_register_default_external(seg, &nsegs, writing, ia); |
c56c65fb TT |
1831 | break; |
1832 | } | |
1833 | if (rc) | |
1834 | return -1; | |
1835 | ||
1836 | return nsegs; | |
1837 | } | |
1838 | ||
1839 | int | |
1840 | rpcrdma_deregister_external(struct rpcrdma_mr_seg *seg, | |
1841 | struct rpcrdma_xprt *r_xprt, void *r) | |
1842 | { | |
1843 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; | |
c56c65fb TT |
1844 | int nsegs = seg->mr_nsegs, rc; |
1845 | ||
1846 | switch (ia->ri_memreg_strategy) { | |
1847 | ||
1848 | #if RPCRDMA_PERSISTENT_REGISTRATION | |
1849 | case RPCRDMA_ALLPHYSICAL: | |
1850 | BUG_ON(nsegs != 1); | |
1851 | rpcrdma_unmap_one(ia, seg); | |
1852 | rc = 0; | |
1853 | break; | |
1854 | #endif | |
1855 | ||
3197d309 TT |
1856 | case RPCRDMA_FRMR: |
1857 | rc = rpcrdma_deregister_frmr_external(seg, ia, r_xprt); | |
1858 | break; | |
1859 | ||
c56c65fb | 1860 | case RPCRDMA_MTHCAFMR: |
8d4ba034 | 1861 | rc = rpcrdma_deregister_fmr_external(seg, ia); |
c56c65fb TT |
1862 | break; |
1863 | ||
1864 | case RPCRDMA_MEMWINDOWS_ASYNC: | |
1865 | case RPCRDMA_MEMWINDOWS: | |
8d4ba034 | 1866 | rc = rpcrdma_deregister_memwin_external(seg, ia, r_xprt, &r); |
c56c65fb TT |
1867 | break; |
1868 | ||
1869 | default: | |
8d4ba034 | 1870 | rc = rpcrdma_deregister_default_external(seg, ia); |
c56c65fb TT |
1871 | break; |
1872 | } | |
1873 | if (r) { | |
1874 | struct rpcrdma_rep *rep = r; | |
1875 | void (*func)(struct rpcrdma_rep *) = rep->rr_func; | |
1876 | rep->rr_func = NULL; | |
1877 | func(rep); /* dereg done, callback now */ | |
1878 | } | |
1879 | return nsegs; | |
1880 | } | |
1881 | ||
1882 | /* | |
1883 | * Prepost any receive buffer, then post send. | |
1884 | * | |
1885 | * Receive buffer is donated to hardware, reclaimed upon recv completion. | |
1886 | */ | |
1887 | int | |
1888 | rpcrdma_ep_post(struct rpcrdma_ia *ia, | |
1889 | struct rpcrdma_ep *ep, | |
1890 | struct rpcrdma_req *req) | |
1891 | { | |
1892 | struct ib_send_wr send_wr, *send_wr_fail; | |
1893 | struct rpcrdma_rep *rep = req->rl_reply; | |
1894 | int rc; | |
1895 | ||
1896 | if (rep) { | |
1897 | rc = rpcrdma_ep_post_recv(ia, ep, rep); | |
1898 | if (rc) | |
1899 | goto out; | |
1900 | req->rl_reply = NULL; | |
1901 | } | |
1902 | ||
1903 | send_wr.next = NULL; | |
1904 | send_wr.wr_id = 0ULL; /* no send cookie */ | |
1905 | send_wr.sg_list = req->rl_send_iov; | |
1906 | send_wr.num_sge = req->rl_niovs; | |
1907 | send_wr.opcode = IB_WR_SEND; | |
c56c65fb TT |
1908 | if (send_wr.num_sge == 4) /* no need to sync any pad (constant) */ |
1909 | ib_dma_sync_single_for_device(ia->ri_id->device, | |
1910 | req->rl_send_iov[3].addr, req->rl_send_iov[3].length, | |
1911 | DMA_TO_DEVICE); | |
1912 | ib_dma_sync_single_for_device(ia->ri_id->device, | |
1913 | req->rl_send_iov[1].addr, req->rl_send_iov[1].length, | |
1914 | DMA_TO_DEVICE); | |
1915 | ib_dma_sync_single_for_device(ia->ri_id->device, | |
1916 | req->rl_send_iov[0].addr, req->rl_send_iov[0].length, | |
1917 | DMA_TO_DEVICE); | |
1918 | ||
1919 | if (DECR_CQCOUNT(ep) > 0) | |
1920 | send_wr.send_flags = 0; | |
1921 | else { /* Provider must take a send completion every now and then */ | |
1922 | INIT_CQCOUNT(ep); | |
1923 | send_wr.send_flags = IB_SEND_SIGNALED; | |
1924 | } | |
1925 | ||
1926 | rc = ib_post_send(ia->ri_id->qp, &send_wr, &send_wr_fail); | |
1927 | if (rc) | |
1928 | dprintk("RPC: %s: ib_post_send returned %i\n", __func__, | |
1929 | rc); | |
1930 | out: | |
1931 | return rc; | |
1932 | } | |
1933 | ||
1934 | /* | |
1935 | * (Re)post a receive buffer. | |
1936 | */ | |
1937 | int | |
1938 | rpcrdma_ep_post_recv(struct rpcrdma_ia *ia, | |
1939 | struct rpcrdma_ep *ep, | |
1940 | struct rpcrdma_rep *rep) | |
1941 | { | |
1942 | struct ib_recv_wr recv_wr, *recv_wr_fail; | |
1943 | int rc; | |
1944 | ||
1945 | recv_wr.next = NULL; | |
1946 | recv_wr.wr_id = (u64) (unsigned long) rep; | |
1947 | recv_wr.sg_list = &rep->rr_iov; | |
1948 | recv_wr.num_sge = 1; | |
1949 | ||
1950 | ib_dma_sync_single_for_cpu(ia->ri_id->device, | |
1951 | rep->rr_iov.addr, rep->rr_iov.length, DMA_BIDIRECTIONAL); | |
1952 | ||
1953 | DECR_CQCOUNT(ep); | |
1954 | rc = ib_post_recv(ia->ri_id->qp, &recv_wr, &recv_wr_fail); | |
1955 | ||
1956 | if (rc) | |
1957 | dprintk("RPC: %s: ib_post_recv returned %i\n", __func__, | |
1958 | rc); | |
1959 | return rc; | |
1960 | } |