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