Commit | Line | Data |
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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> |
5a0e3ad6 | 51 | #include <linux/slab.h> |
eba8ff66 | 52 | #include <linux/prefetch.h> |
0dd39cae | 53 | #include <linux/sunrpc/addr.h> |
65866f82 | 54 | #include <asm/bitops.h> |
c56c65fb | 55 | |
f58851e6 TT |
56 | #include "xprt_rdma.h" |
57 | ||
c56c65fb TT |
58 | /* |
59 | * Globals/Macros | |
60 | */ | |
61 | ||
f895b252 | 62 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
c56c65fb TT |
63 | # define RPCDBG_FACILITY RPCDBG_TRANS |
64 | #endif | |
65 | ||
66 | /* | |
67 | * internal functions | |
68 | */ | |
69 | ||
70 | /* | |
71 | * handle replies in tasklet context, using a single, global list | |
72 | * rdma tasklet function -- just turn around and call the func | |
73 | * for all replies on the list | |
74 | */ | |
75 | ||
76 | static DEFINE_SPINLOCK(rpcrdma_tk_lock_g); | |
77 | static LIST_HEAD(rpcrdma_tasklets_g); | |
78 | ||
79 | static void | |
80 | rpcrdma_run_tasklet(unsigned long data) | |
81 | { | |
82 | struct rpcrdma_rep *rep; | |
c56c65fb TT |
83 | unsigned long flags; |
84 | ||
85 | data = data; | |
86 | spin_lock_irqsave(&rpcrdma_tk_lock_g, flags); | |
87 | while (!list_empty(&rpcrdma_tasklets_g)) { | |
88 | rep = list_entry(rpcrdma_tasklets_g.next, | |
89 | struct rpcrdma_rep, rr_list); | |
90 | list_del(&rep->rr_list); | |
c56c65fb TT |
91 | spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags); |
92 | ||
494ae30d | 93 | rpcrdma_reply_handler(rep); |
c56c65fb TT |
94 | |
95 | spin_lock_irqsave(&rpcrdma_tk_lock_g, flags); | |
96 | } | |
97 | spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags); | |
98 | } | |
99 | ||
100 | static DECLARE_TASKLET(rpcrdma_tasklet_g, rpcrdma_run_tasklet, 0UL); | |
101 | ||
7ff11de1 CL |
102 | static const char * const async_event[] = { |
103 | "CQ error", | |
104 | "QP fatal error", | |
105 | "QP request error", | |
106 | "QP access error", | |
107 | "communication established", | |
108 | "send queue drained", | |
109 | "path migration successful", | |
110 | "path mig error", | |
111 | "device fatal error", | |
112 | "port active", | |
113 | "port error", | |
114 | "LID change", | |
115 | "P_key change", | |
116 | "SM change", | |
117 | "SRQ error", | |
118 | "SRQ limit reached", | |
119 | "last WQE reached", | |
120 | "client reregister", | |
121 | "GID change", | |
122 | }; | |
123 | ||
124 | #define ASYNC_MSG(status) \ | |
125 | ((status) < ARRAY_SIZE(async_event) ? \ | |
126 | async_event[(status)] : "unknown async error") | |
127 | ||
f1a03b76 CL |
128 | static void |
129 | rpcrdma_schedule_tasklet(struct list_head *sched_list) | |
130 | { | |
131 | unsigned long flags; | |
132 | ||
133 | spin_lock_irqsave(&rpcrdma_tk_lock_g, flags); | |
134 | list_splice_tail(sched_list, &rpcrdma_tasklets_g); | |
135 | spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags); | |
136 | tasklet_schedule(&rpcrdma_tasklet_g); | |
137 | } | |
138 | ||
c56c65fb TT |
139 | static void |
140 | rpcrdma_qp_async_error_upcall(struct ib_event *event, void *context) | |
141 | { | |
142 | struct rpcrdma_ep *ep = context; | |
143 | ||
7ff11de1 CL |
144 | pr_err("RPC: %s: %s on device %s ep %p\n", |
145 | __func__, ASYNC_MSG(event->event), | |
146 | event->device->name, context); | |
c56c65fb TT |
147 | if (ep->rep_connected == 1) { |
148 | ep->rep_connected = -EIO; | |
afadc468 | 149 | rpcrdma_conn_func(ep); |
c56c65fb TT |
150 | wake_up_all(&ep->rep_connect_wait); |
151 | } | |
152 | } | |
153 | ||
154 | static void | |
155 | rpcrdma_cq_async_error_upcall(struct ib_event *event, void *context) | |
156 | { | |
157 | struct rpcrdma_ep *ep = context; | |
158 | ||
7ff11de1 CL |
159 | pr_err("RPC: %s: %s on device %s ep %p\n", |
160 | __func__, ASYNC_MSG(event->event), | |
161 | event->device->name, context); | |
c56c65fb TT |
162 | if (ep->rep_connected == 1) { |
163 | ep->rep_connected = -EIO; | |
afadc468 | 164 | rpcrdma_conn_func(ep); |
c56c65fb TT |
165 | wake_up_all(&ep->rep_connect_wait); |
166 | } | |
167 | } | |
168 | ||
8502427c CL |
169 | static const char * const wc_status[] = { |
170 | "success", | |
171 | "local length error", | |
172 | "local QP operation error", | |
173 | "local EE context operation error", | |
174 | "local protection error", | |
175 | "WR flushed", | |
176 | "memory management operation error", | |
177 | "bad response error", | |
178 | "local access error", | |
179 | "remote invalid request error", | |
180 | "remote access error", | |
181 | "remote operation error", | |
182 | "transport retry counter exceeded", | |
e46ac34c | 183 | "RNR retry counter exceeded", |
8502427c CL |
184 | "local RDD violation error", |
185 | "remove invalid RD request", | |
186 | "operation aborted", | |
187 | "invalid EE context number", | |
188 | "invalid EE context state", | |
189 | "fatal error", | |
190 | "response timeout error", | |
191 | "general error", | |
192 | }; | |
193 | ||
194 | #define COMPLETION_MSG(status) \ | |
195 | ((status) < ARRAY_SIZE(wc_status) ? \ | |
196 | wc_status[(status)] : "unexpected completion error") | |
197 | ||
fc664485 CL |
198 | static void |
199 | rpcrdma_sendcq_process_wc(struct ib_wc *wc) | |
c56c65fb | 200 | { |
8502427c | 201 | /* WARNING: Only wr_id and status are reliable at this point */ |
e46ac34c CL |
202 | if (wc->wr_id == RPCRDMA_IGNORE_COMPLETION) { |
203 | if (wc->status != IB_WC_SUCCESS && | |
204 | wc->status != IB_WC_WR_FLUSH_ERR) | |
8502427c CL |
205 | pr_err("RPC: %s: SEND: %s\n", |
206 | __func__, COMPLETION_MSG(wc->status)); | |
207 | } else { | |
208 | struct rpcrdma_mw *r; | |
209 | ||
210 | r = (struct rpcrdma_mw *)(unsigned long)wc->wr_id; | |
e46ac34c | 211 | r->mw_sendcompletion(wc); |
8502427c | 212 | } |
c56c65fb TT |
213 | } |
214 | ||
fc664485 | 215 | static int |
1c00dd07 | 216 | rpcrdma_sendcq_poll(struct ib_cq *cq, struct rpcrdma_ep *ep) |
c56c65fb | 217 | { |
1c00dd07 | 218 | struct ib_wc *wcs; |
8301a2c0 | 219 | int budget, count, rc; |
c56c65fb | 220 | |
8301a2c0 | 221 | budget = RPCRDMA_WC_BUDGET / RPCRDMA_POLLSIZE; |
1c00dd07 CL |
222 | do { |
223 | wcs = ep->rep_send_wcs; | |
224 | ||
225 | rc = ib_poll_cq(cq, RPCRDMA_POLLSIZE, wcs); | |
226 | if (rc <= 0) | |
227 | return rc; | |
228 | ||
229 | count = rc; | |
230 | while (count-- > 0) | |
231 | rpcrdma_sendcq_process_wc(wcs++); | |
8301a2c0 | 232 | } while (rc == RPCRDMA_POLLSIZE && --budget); |
1c00dd07 | 233 | return 0; |
fc664485 | 234 | } |
c56c65fb | 235 | |
fc664485 CL |
236 | /* |
237 | * Handle send, fast_reg_mr, and local_inv completions. | |
238 | * | |
239 | * Send events are typically suppressed and thus do not result | |
240 | * in an upcall. Occasionally one is signaled, however. This | |
241 | * prevents the provider's completion queue from wrapping and | |
242 | * losing a completion. | |
243 | */ | |
244 | static void | |
245 | rpcrdma_sendcq_upcall(struct ib_cq *cq, void *cq_context) | |
246 | { | |
1c00dd07 | 247 | struct rpcrdma_ep *ep = (struct rpcrdma_ep *)cq_context; |
fc664485 CL |
248 | int rc; |
249 | ||
1c00dd07 | 250 | rc = rpcrdma_sendcq_poll(cq, ep); |
fc664485 CL |
251 | if (rc) { |
252 | dprintk("RPC: %s: ib_poll_cq failed: %i\n", | |
253 | __func__, rc); | |
254 | return; | |
c56c65fb TT |
255 | } |
256 | ||
7f23f6f6 CL |
257 | rc = ib_req_notify_cq(cq, |
258 | IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS); | |
259 | if (rc == 0) | |
260 | return; | |
261 | if (rc < 0) { | |
fc664485 CL |
262 | dprintk("RPC: %s: ib_req_notify_cq failed: %i\n", |
263 | __func__, rc); | |
264 | return; | |
265 | } | |
266 | ||
1c00dd07 | 267 | rpcrdma_sendcq_poll(cq, ep); |
fc664485 CL |
268 | } |
269 | ||
270 | static void | |
bb96193d | 271 | rpcrdma_recvcq_process_wc(struct ib_wc *wc, struct list_head *sched_list) |
fc664485 CL |
272 | { |
273 | struct rpcrdma_rep *rep = | |
274 | (struct rpcrdma_rep *)(unsigned long)wc->wr_id; | |
275 | ||
8502427c CL |
276 | /* WARNING: Only wr_id and status are reliable at this point */ |
277 | if (wc->status != IB_WC_SUCCESS) | |
278 | goto out_fail; | |
fc664485 | 279 | |
8502427c | 280 | /* status == SUCCESS means all fields in wc are trustworthy */ |
fc664485 CL |
281 | if (wc->opcode != IB_WC_RECV) |
282 | return; | |
283 | ||
8502427c CL |
284 | dprintk("RPC: %s: rep %p opcode 'recv', length %u: success\n", |
285 | __func__, rep, wc->byte_len); | |
286 | ||
fc664485 | 287 | rep->rr_len = wc->byte_len; |
89e0d112 | 288 | ib_dma_sync_single_for_cpu(rep->rr_device, |
6b1184cd CL |
289 | rdmab_addr(rep->rr_rdmabuf), |
290 | rep->rr_len, DMA_FROM_DEVICE); | |
291 | prefetch(rdmab_to_msg(rep->rr_rdmabuf)); | |
fc664485 CL |
292 | |
293 | out_schedule: | |
bb96193d | 294 | list_add_tail(&rep->rr_list, sched_list); |
8502427c CL |
295 | return; |
296 | out_fail: | |
297 | if (wc->status != IB_WC_WR_FLUSH_ERR) | |
298 | pr_err("RPC: %s: rep %p: %s\n", | |
299 | __func__, rep, COMPLETION_MSG(wc->status)); | |
300 | rep->rr_len = ~0U; | |
301 | goto out_schedule; | |
fc664485 CL |
302 | } |
303 | ||
304 | static int | |
1c00dd07 | 305 | rpcrdma_recvcq_poll(struct ib_cq *cq, struct rpcrdma_ep *ep) |
fc664485 | 306 | { |
bb96193d | 307 | struct list_head sched_list; |
1c00dd07 | 308 | struct ib_wc *wcs; |
8301a2c0 | 309 | int budget, count, rc; |
fc664485 | 310 | |
bb96193d | 311 | INIT_LIST_HEAD(&sched_list); |
8301a2c0 | 312 | budget = RPCRDMA_WC_BUDGET / RPCRDMA_POLLSIZE; |
1c00dd07 CL |
313 | do { |
314 | wcs = ep->rep_recv_wcs; | |
315 | ||
316 | rc = ib_poll_cq(cq, RPCRDMA_POLLSIZE, wcs); | |
317 | if (rc <= 0) | |
bb96193d | 318 | goto out_schedule; |
1c00dd07 CL |
319 | |
320 | count = rc; | |
321 | while (count-- > 0) | |
bb96193d | 322 | rpcrdma_recvcq_process_wc(wcs++, &sched_list); |
8301a2c0 | 323 | } while (rc == RPCRDMA_POLLSIZE && --budget); |
bb96193d CL |
324 | rc = 0; |
325 | ||
326 | out_schedule: | |
f1a03b76 | 327 | rpcrdma_schedule_tasklet(&sched_list); |
bb96193d | 328 | return rc; |
c56c65fb TT |
329 | } |
330 | ||
331 | /* | |
fc664485 | 332 | * Handle receive completions. |
c56c65fb | 333 | * |
c56c65fb TT |
334 | * It is reentrant but processes single events in order to maintain |
335 | * ordering of receives to keep server credits. | |
336 | * | |
337 | * It is the responsibility of the scheduled tasklet to return | |
338 | * recv buffers to the pool. NOTE: this affects synchronization of | |
339 | * connection shutdown. That is, the structures required for | |
340 | * the completion of the reply handler must remain intact until | |
341 | * all memory has been reclaimed. | |
c56c65fb TT |
342 | */ |
343 | static void | |
fc664485 | 344 | rpcrdma_recvcq_upcall(struct ib_cq *cq, void *cq_context) |
c56c65fb | 345 | { |
1c00dd07 | 346 | struct rpcrdma_ep *ep = (struct rpcrdma_ep *)cq_context; |
c56c65fb TT |
347 | int rc; |
348 | ||
1c00dd07 | 349 | rc = rpcrdma_recvcq_poll(cq, ep); |
fc664485 CL |
350 | if (rc) { |
351 | dprintk("RPC: %s: ib_poll_cq failed: %i\n", | |
352 | __func__, rc); | |
c56c65fb | 353 | return; |
fc664485 | 354 | } |
c56c65fb | 355 | |
7f23f6f6 CL |
356 | rc = ib_req_notify_cq(cq, |
357 | IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS); | |
358 | if (rc == 0) | |
359 | return; | |
360 | if (rc < 0) { | |
fc664485 | 361 | dprintk("RPC: %s: ib_req_notify_cq failed: %i\n", |
c56c65fb TT |
362 | __func__, rc); |
363 | return; | |
364 | } | |
365 | ||
1c00dd07 | 366 | rpcrdma_recvcq_poll(cq, ep); |
c56c65fb TT |
367 | } |
368 | ||
a7bc211a CL |
369 | static void |
370 | rpcrdma_flush_cqs(struct rpcrdma_ep *ep) | |
371 | { | |
5c166bef CL |
372 | struct ib_wc wc; |
373 | LIST_HEAD(sched_list); | |
374 | ||
375 | while (ib_poll_cq(ep->rep_attr.recv_cq, 1, &wc) > 0) | |
376 | rpcrdma_recvcq_process_wc(&wc, &sched_list); | |
377 | if (!list_empty(&sched_list)) | |
378 | rpcrdma_schedule_tasklet(&sched_list); | |
379 | while (ib_poll_cq(ep->rep_attr.send_cq, 1, &wc) > 0) | |
380 | rpcrdma_sendcq_process_wc(&wc); | |
a7bc211a CL |
381 | } |
382 | ||
f895b252 | 383 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
c56c65fb TT |
384 | static const char * const conn[] = { |
385 | "address resolved", | |
386 | "address error", | |
387 | "route resolved", | |
388 | "route error", | |
389 | "connect request", | |
390 | "connect response", | |
391 | "connect error", | |
392 | "unreachable", | |
393 | "rejected", | |
394 | "established", | |
395 | "disconnected", | |
8079fb78 CL |
396 | "device removal", |
397 | "multicast join", | |
398 | "multicast error", | |
399 | "address change", | |
400 | "timewait exit", | |
c56c65fb | 401 | }; |
8079fb78 CL |
402 | |
403 | #define CONNECTION_MSG(status) \ | |
404 | ((status) < ARRAY_SIZE(conn) ? \ | |
405 | conn[(status)] : "unrecognized connection error") | |
c56c65fb TT |
406 | #endif |
407 | ||
408 | static int | |
409 | rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event) | |
410 | { | |
411 | struct rpcrdma_xprt *xprt = id->context; | |
412 | struct rpcrdma_ia *ia = &xprt->rx_ia; | |
413 | struct rpcrdma_ep *ep = &xprt->rx_ep; | |
f895b252 | 414 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
0dd39cae | 415 | struct sockaddr *sap = (struct sockaddr *)&ep->rep_remote_addr; |
ff0db049 | 416 | #endif |
ce1ab9ab CL |
417 | struct ib_qp_attr *attr = &ia->ri_qp_attr; |
418 | struct ib_qp_init_attr *iattr = &ia->ri_qp_init_attr; | |
c56c65fb TT |
419 | int connstate = 0; |
420 | ||
421 | switch (event->event) { | |
422 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
423 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
5675add3 | 424 | ia->ri_async_rc = 0; |
c56c65fb TT |
425 | complete(&ia->ri_done); |
426 | break; | |
427 | case RDMA_CM_EVENT_ADDR_ERROR: | |
428 | ia->ri_async_rc = -EHOSTUNREACH; | |
429 | dprintk("RPC: %s: CM address resolution error, ep 0x%p\n", | |
430 | __func__, ep); | |
431 | complete(&ia->ri_done); | |
432 | break; | |
433 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
434 | ia->ri_async_rc = -ENETUNREACH; | |
435 | dprintk("RPC: %s: CM route resolution error, ep 0x%p\n", | |
436 | __func__, ep); | |
437 | complete(&ia->ri_done); | |
438 | break; | |
439 | case RDMA_CM_EVENT_ESTABLISHED: | |
440 | connstate = 1; | |
ce1ab9ab CL |
441 | ib_query_qp(ia->ri_id->qp, attr, |
442 | IB_QP_MAX_QP_RD_ATOMIC | IB_QP_MAX_DEST_RD_ATOMIC, | |
443 | iattr); | |
c56c65fb TT |
444 | dprintk("RPC: %s: %d responder resources" |
445 | " (%d initiator)\n", | |
ce1ab9ab CL |
446 | __func__, attr->max_dest_rd_atomic, |
447 | attr->max_rd_atomic); | |
c56c65fb TT |
448 | goto connected; |
449 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
450 | connstate = -ENOTCONN; | |
451 | goto connected; | |
452 | case RDMA_CM_EVENT_UNREACHABLE: | |
453 | connstate = -ENETDOWN; | |
454 | goto connected; | |
455 | case RDMA_CM_EVENT_REJECTED: | |
456 | connstate = -ECONNREFUSED; | |
457 | goto connected; | |
458 | case RDMA_CM_EVENT_DISCONNECTED: | |
459 | connstate = -ECONNABORTED; | |
460 | goto connected; | |
461 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
462 | connstate = -ENODEV; | |
463 | connected: | |
c56c65fb TT |
464 | dprintk("RPC: %s: %sconnected\n", |
465 | __func__, connstate > 0 ? "" : "dis"); | |
466 | ep->rep_connected = connstate; | |
afadc468 | 467 | rpcrdma_conn_func(ep); |
c56c65fb | 468 | wake_up_all(&ep->rep_connect_wait); |
8079fb78 | 469 | /*FALLTHROUGH*/ |
c56c65fb | 470 | default: |
0dd39cae CL |
471 | dprintk("RPC: %s: %pIS:%u (ep 0x%p): %s\n", |
472 | __func__, sap, rpc_get_port(sap), ep, | |
8079fb78 | 473 | CONNECTION_MSG(event->event)); |
c56c65fb TT |
474 | break; |
475 | } | |
476 | ||
f895b252 | 477 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
b3cd8d45 | 478 | if (connstate == 1) { |
ce1ab9ab | 479 | int ird = attr->max_dest_rd_atomic; |
b3cd8d45 | 480 | int tird = ep->rep_remote_cma.responder_resources; |
0dd39cae | 481 | |
a0ce85f5 | 482 | pr_info("rpcrdma: connection to %pIS:%u on %s, memreg '%s', %d credits, %d responders%s\n", |
0dd39cae | 483 | sap, rpc_get_port(sap), |
89e0d112 | 484 | ia->ri_device->name, |
a0ce85f5 | 485 | ia->ri_ops->ro_displayname, |
b3cd8d45 TT |
486 | xprt->rx_buf.rb_max_requests, |
487 | ird, ird < 4 && ird < tird / 2 ? " (low!)" : ""); | |
488 | } else if (connstate < 0) { | |
0dd39cae CL |
489 | pr_info("rpcrdma: connection to %pIS:%u closed (%d)\n", |
490 | sap, rpc_get_port(sap), connstate); | |
b3cd8d45 TT |
491 | } |
492 | #endif | |
493 | ||
c56c65fb TT |
494 | return 0; |
495 | } | |
496 | ||
497 | static struct rdma_cm_id * | |
498 | rpcrdma_create_id(struct rpcrdma_xprt *xprt, | |
499 | struct rpcrdma_ia *ia, struct sockaddr *addr) | |
500 | { | |
501 | struct rdma_cm_id *id; | |
502 | int rc; | |
503 | ||
1a954051 TT |
504 | init_completion(&ia->ri_done); |
505 | ||
b26f9b99 | 506 | id = rdma_create_id(rpcrdma_conn_upcall, xprt, RDMA_PS_TCP, IB_QPT_RC); |
c56c65fb TT |
507 | if (IS_ERR(id)) { |
508 | rc = PTR_ERR(id); | |
509 | dprintk("RPC: %s: rdma_create_id() failed %i\n", | |
510 | __func__, rc); | |
511 | return id; | |
512 | } | |
513 | ||
5675add3 | 514 | ia->ri_async_rc = -ETIMEDOUT; |
c56c65fb TT |
515 | rc = rdma_resolve_addr(id, NULL, addr, RDMA_RESOLVE_TIMEOUT); |
516 | if (rc) { | |
517 | dprintk("RPC: %s: rdma_resolve_addr() failed %i\n", | |
518 | __func__, rc); | |
519 | goto out; | |
520 | } | |
5675add3 TT |
521 | wait_for_completion_interruptible_timeout(&ia->ri_done, |
522 | msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1); | |
c56c65fb TT |
523 | rc = ia->ri_async_rc; |
524 | if (rc) | |
525 | goto out; | |
526 | ||
5675add3 | 527 | ia->ri_async_rc = -ETIMEDOUT; |
c56c65fb TT |
528 | rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT); |
529 | if (rc) { | |
530 | dprintk("RPC: %s: rdma_resolve_route() failed %i\n", | |
531 | __func__, rc); | |
532 | goto out; | |
533 | } | |
5675add3 TT |
534 | wait_for_completion_interruptible_timeout(&ia->ri_done, |
535 | msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1); | |
c56c65fb TT |
536 | rc = ia->ri_async_rc; |
537 | if (rc) | |
538 | goto out; | |
539 | ||
540 | return id; | |
541 | ||
542 | out: | |
543 | rdma_destroy_id(id); | |
544 | return ERR_PTR(rc); | |
545 | } | |
546 | ||
547 | /* | |
548 | * Drain any cq, prior to teardown. | |
549 | */ | |
550 | static void | |
551 | rpcrdma_clean_cq(struct ib_cq *cq) | |
552 | { | |
553 | struct ib_wc wc; | |
554 | int count = 0; | |
555 | ||
556 | while (1 == ib_poll_cq(cq, 1, &wc)) | |
557 | ++count; | |
558 | ||
559 | if (count) | |
560 | dprintk("RPC: %s: flushed %d events (last 0x%x)\n", | |
561 | __func__, count, wc.opcode); | |
562 | } | |
563 | ||
564 | /* | |
565 | * Exported functions. | |
566 | */ | |
567 | ||
568 | /* | |
569 | * Open and initialize an Interface Adapter. | |
570 | * o initializes fields of struct rpcrdma_ia, including | |
571 | * interface and provider attributes and protection zone. | |
572 | */ | |
573 | int | |
574 | rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg) | |
575 | { | |
bd7ed1d1 | 576 | int rc, mem_priv; |
c56c65fb | 577 | struct rpcrdma_ia *ia = &xprt->rx_ia; |
7bc7972c | 578 | struct ib_device_attr *devattr = &ia->ri_devattr; |
c56c65fb | 579 | |
c56c65fb TT |
580 | ia->ri_id = rpcrdma_create_id(xprt, ia, addr); |
581 | if (IS_ERR(ia->ri_id)) { | |
582 | rc = PTR_ERR(ia->ri_id); | |
583 | goto out1; | |
584 | } | |
89e0d112 | 585 | ia->ri_device = ia->ri_id->device; |
c56c65fb | 586 | |
89e0d112 | 587 | ia->ri_pd = ib_alloc_pd(ia->ri_device); |
c56c65fb TT |
588 | if (IS_ERR(ia->ri_pd)) { |
589 | rc = PTR_ERR(ia->ri_pd); | |
590 | dprintk("RPC: %s: ib_alloc_pd() failed %i\n", | |
591 | __func__, rc); | |
592 | goto out2; | |
593 | } | |
594 | ||
89e0d112 | 595 | rc = ib_query_device(ia->ri_device, devattr); |
bd7ed1d1 TT |
596 | if (rc) { |
597 | dprintk("RPC: %s: ib_query_device failed %d\n", | |
598 | __func__, rc); | |
5ae711a2 | 599 | goto out3; |
bd7ed1d1 TT |
600 | } |
601 | ||
7bc7972c | 602 | if (devattr->device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY) { |
bd7ed1d1 | 603 | ia->ri_have_dma_lkey = 1; |
89e0d112 | 604 | ia->ri_dma_lkey = ia->ri_device->local_dma_lkey; |
bd7ed1d1 TT |
605 | } |
606 | ||
f10eafd3 | 607 | if (memreg == RPCRDMA_FRMR) { |
3197d309 | 608 | /* Requires both frmr reg and local dma lkey */ |
41f97028 | 609 | if (((devattr->device_cap_flags & |
3197d309 | 610 | (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) != |
41f97028 CL |
611 | (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) || |
612 | (devattr->max_fast_reg_page_list_len == 0)) { | |
3197d309 | 613 | dprintk("RPC: %s: FRMR registration " |
f10eafd3 CL |
614 | "not supported by HCA\n", __func__); |
615 | memreg = RPCRDMA_MTHCAFMR; | |
bd7ed1d1 | 616 | } |
f10eafd3 CL |
617 | } |
618 | if (memreg == RPCRDMA_MTHCAFMR) { | |
89e0d112 | 619 | if (!ia->ri_device->alloc_fmr) { |
f10eafd3 CL |
620 | dprintk("RPC: %s: MTHCAFMR registration " |
621 | "not supported by HCA\n", __func__); | |
f10eafd3 | 622 | memreg = RPCRDMA_ALLPHYSICAL; |
f10eafd3 | 623 | } |
bd7ed1d1 TT |
624 | } |
625 | ||
c56c65fb TT |
626 | /* |
627 | * Optionally obtain an underlying physical identity mapping in | |
628 | * order to do a memory window-based bind. This base registration | |
629 | * is protected from remote access - that is enabled only by binding | |
630 | * for the specific bytes targeted during each RPC operation, and | |
631 | * revoked after the corresponding completion similar to a storage | |
632 | * adapter. | |
633 | */ | |
bd7ed1d1 | 634 | switch (memreg) { |
3197d309 | 635 | case RPCRDMA_FRMR: |
a0ce85f5 | 636 | ia->ri_ops = &rpcrdma_frwr_memreg_ops; |
bd7ed1d1 | 637 | break; |
bd7ed1d1 | 638 | case RPCRDMA_ALLPHYSICAL: |
a0ce85f5 | 639 | ia->ri_ops = &rpcrdma_physical_memreg_ops; |
bd7ed1d1 TT |
640 | mem_priv = IB_ACCESS_LOCAL_WRITE | |
641 | IB_ACCESS_REMOTE_WRITE | | |
642 | IB_ACCESS_REMOTE_READ; | |
643 | goto register_setup; | |
bd7ed1d1 | 644 | case RPCRDMA_MTHCAFMR: |
a0ce85f5 | 645 | ia->ri_ops = &rpcrdma_fmr_memreg_ops; |
bd7ed1d1 | 646 | if (ia->ri_have_dma_lkey) |
c56c65fb | 647 | break; |
bd7ed1d1 TT |
648 | mem_priv = IB_ACCESS_LOCAL_WRITE; |
649 | register_setup: | |
c56c65fb TT |
650 | ia->ri_bind_mem = ib_get_dma_mr(ia->ri_pd, mem_priv); |
651 | if (IS_ERR(ia->ri_bind_mem)) { | |
652 | printk(KERN_ALERT "%s: ib_get_dma_mr for " | |
0ac531c1 | 653 | "phys register failed with %lX\n", |
c56c65fb | 654 | __func__, PTR_ERR(ia->ri_bind_mem)); |
0ac531c1 | 655 | rc = -ENOMEM; |
5ae711a2 | 656 | goto out3; |
c56c65fb | 657 | } |
bd7ed1d1 TT |
658 | break; |
659 | default: | |
cdd9ade7 CL |
660 | printk(KERN_ERR "RPC: Unsupported memory " |
661 | "registration mode: %d\n", memreg); | |
662 | rc = -ENOMEM; | |
5ae711a2 | 663 | goto out3; |
c56c65fb | 664 | } |
a0ce85f5 CL |
665 | dprintk("RPC: %s: memory registration strategy is '%s'\n", |
666 | __func__, ia->ri_ops->ro_displayname); | |
c56c65fb | 667 | |
73806c88 | 668 | rwlock_init(&ia->ri_qplock); |
c56c65fb | 669 | return 0; |
5ae711a2 CL |
670 | |
671 | out3: | |
672 | ib_dealloc_pd(ia->ri_pd); | |
673 | ia->ri_pd = NULL; | |
c56c65fb TT |
674 | out2: |
675 | rdma_destroy_id(ia->ri_id); | |
fee08caf | 676 | ia->ri_id = NULL; |
c56c65fb TT |
677 | out1: |
678 | return rc; | |
679 | } | |
680 | ||
681 | /* | |
682 | * Clean up/close an IA. | |
683 | * o if event handles and PD have been initialized, free them. | |
684 | * o close the IA | |
685 | */ | |
686 | void | |
687 | rpcrdma_ia_close(struct rpcrdma_ia *ia) | |
688 | { | |
689 | int rc; | |
690 | ||
691 | dprintk("RPC: %s: entering\n", __func__); | |
692 | if (ia->ri_bind_mem != NULL) { | |
693 | rc = ib_dereg_mr(ia->ri_bind_mem); | |
694 | dprintk("RPC: %s: ib_dereg_mr returned %i\n", | |
695 | __func__, rc); | |
696 | } | |
6d44698d | 697 | |
fee08caf TT |
698 | if (ia->ri_id != NULL && !IS_ERR(ia->ri_id)) { |
699 | if (ia->ri_id->qp) | |
700 | rdma_destroy_qp(ia->ri_id); | |
701 | rdma_destroy_id(ia->ri_id); | |
702 | ia->ri_id = NULL; | |
703 | } | |
6d44698d CL |
704 | |
705 | /* If the pd is still busy, xprtrdma missed freeing a resource */ | |
706 | if (ia->ri_pd && !IS_ERR(ia->ri_pd)) | |
707 | WARN_ON(ib_dealloc_pd(ia->ri_pd)); | |
c56c65fb TT |
708 | } |
709 | ||
710 | /* | |
711 | * Create unconnected endpoint. | |
712 | */ | |
713 | int | |
714 | rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia, | |
715 | struct rpcrdma_create_data_internal *cdata) | |
716 | { | |
7bc7972c | 717 | struct ib_device_attr *devattr = &ia->ri_devattr; |
fc664485 | 718 | struct ib_cq *sendcq, *recvcq; |
5d40a8a5 | 719 | int rc, err; |
c56c65fb | 720 | |
c56c65fb | 721 | /* check provider's send/recv wr limits */ |
7bc7972c CL |
722 | if (cdata->max_requests > devattr->max_qp_wr) |
723 | cdata->max_requests = devattr->max_qp_wr; | |
c56c65fb TT |
724 | |
725 | ep->rep_attr.event_handler = rpcrdma_qp_async_error_upcall; | |
726 | ep->rep_attr.qp_context = ep; | |
c56c65fb TT |
727 | ep->rep_attr.srq = NULL; |
728 | ep->rep_attr.cap.max_send_wr = cdata->max_requests; | |
3968cb58 CL |
729 | rc = ia->ri_ops->ro_open(ia, ep, cdata); |
730 | if (rc) | |
731 | return rc; | |
c56c65fb TT |
732 | ep->rep_attr.cap.max_recv_wr = cdata->max_requests; |
733 | ep->rep_attr.cap.max_send_sge = (cdata->padding ? 4 : 2); | |
734 | ep->rep_attr.cap.max_recv_sge = 1; | |
735 | ep->rep_attr.cap.max_inline_data = 0; | |
736 | ep->rep_attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
737 | ep->rep_attr.qp_type = IB_QPT_RC; | |
738 | ep->rep_attr.port_num = ~0; | |
739 | ||
c05fbb5a CL |
740 | if (cdata->padding) { |
741 | ep->rep_padbuf = rpcrdma_alloc_regbuf(ia, cdata->padding, | |
742 | GFP_KERNEL); | |
743 | if (IS_ERR(ep->rep_padbuf)) | |
744 | return PTR_ERR(ep->rep_padbuf); | |
745 | } else | |
746 | ep->rep_padbuf = NULL; | |
747 | ||
c56c65fb TT |
748 | dprintk("RPC: %s: requested max: dtos: send %d recv %d; " |
749 | "iovs: send %d recv %d\n", | |
750 | __func__, | |
751 | ep->rep_attr.cap.max_send_wr, | |
752 | ep->rep_attr.cap.max_recv_wr, | |
753 | ep->rep_attr.cap.max_send_sge, | |
754 | ep->rep_attr.cap.max_recv_sge); | |
755 | ||
756 | /* set trigger for requesting send completion */ | |
fc664485 | 757 | ep->rep_cqinit = ep->rep_attr.cap.max_send_wr/2 - 1; |
e7104a2a CL |
758 | if (ep->rep_cqinit > RPCRDMA_MAX_UNSIGNALED_SENDS) |
759 | ep->rep_cqinit = RPCRDMA_MAX_UNSIGNALED_SENDS; | |
760 | else if (ep->rep_cqinit <= 2) | |
c56c65fb TT |
761 | ep->rep_cqinit = 0; |
762 | INIT_CQCOUNT(ep); | |
c56c65fb | 763 | init_waitqueue_head(&ep->rep_connect_wait); |
254f91e2 | 764 | INIT_DELAYED_WORK(&ep->rep_connect_worker, rpcrdma_connect_worker); |
c56c65fb | 765 | |
89e0d112 CL |
766 | sendcq = ib_create_cq(ia->ri_device, rpcrdma_sendcq_upcall, |
767 | rpcrdma_cq_async_error_upcall, ep, | |
768 | ep->rep_attr.cap.max_send_wr + 1, 0); | |
fc664485 CL |
769 | if (IS_ERR(sendcq)) { |
770 | rc = PTR_ERR(sendcq); | |
771 | dprintk("RPC: %s: failed to create send CQ: %i\n", | |
c56c65fb TT |
772 | __func__, rc); |
773 | goto out1; | |
774 | } | |
775 | ||
fc664485 | 776 | rc = ib_req_notify_cq(sendcq, IB_CQ_NEXT_COMP); |
c56c65fb TT |
777 | if (rc) { |
778 | dprintk("RPC: %s: ib_req_notify_cq failed: %i\n", | |
779 | __func__, rc); | |
780 | goto out2; | |
781 | } | |
782 | ||
89e0d112 CL |
783 | recvcq = ib_create_cq(ia->ri_device, rpcrdma_recvcq_upcall, |
784 | rpcrdma_cq_async_error_upcall, ep, | |
785 | ep->rep_attr.cap.max_recv_wr + 1, 0); | |
fc664485 CL |
786 | if (IS_ERR(recvcq)) { |
787 | rc = PTR_ERR(recvcq); | |
788 | dprintk("RPC: %s: failed to create recv CQ: %i\n", | |
789 | __func__, rc); | |
790 | goto out2; | |
791 | } | |
792 | ||
793 | rc = ib_req_notify_cq(recvcq, IB_CQ_NEXT_COMP); | |
794 | if (rc) { | |
795 | dprintk("RPC: %s: ib_req_notify_cq failed: %i\n", | |
796 | __func__, rc); | |
797 | ib_destroy_cq(recvcq); | |
798 | goto out2; | |
799 | } | |
800 | ||
801 | ep->rep_attr.send_cq = sendcq; | |
802 | ep->rep_attr.recv_cq = recvcq; | |
c56c65fb TT |
803 | |
804 | /* Initialize cma parameters */ | |
805 | ||
806 | /* RPC/RDMA does not use private data */ | |
807 | ep->rep_remote_cma.private_data = NULL; | |
808 | ep->rep_remote_cma.private_data_len = 0; | |
809 | ||
810 | /* Client offers RDMA Read but does not initiate */ | |
b334eaab | 811 | ep->rep_remote_cma.initiator_depth = 0; |
7bc7972c | 812 | if (devattr->max_qp_rd_atom > 32) /* arbitrary but <= 255 */ |
b334eaab TT |
813 | ep->rep_remote_cma.responder_resources = 32; |
814 | else | |
7bc7972c CL |
815 | ep->rep_remote_cma.responder_resources = |
816 | devattr->max_qp_rd_atom; | |
c56c65fb TT |
817 | |
818 | ep->rep_remote_cma.retry_count = 7; | |
819 | ep->rep_remote_cma.flow_control = 0; | |
820 | ep->rep_remote_cma.rnr_retry_count = 0; | |
821 | ||
822 | return 0; | |
823 | ||
824 | out2: | |
fc664485 | 825 | err = ib_destroy_cq(sendcq); |
5d40a8a5 CL |
826 | if (err) |
827 | dprintk("RPC: %s: ib_destroy_cq returned %i\n", | |
828 | __func__, err); | |
c56c65fb | 829 | out1: |
c05fbb5a | 830 | rpcrdma_free_regbuf(ia, ep->rep_padbuf); |
c56c65fb TT |
831 | return rc; |
832 | } | |
833 | ||
834 | /* | |
835 | * rpcrdma_ep_destroy | |
836 | * | |
837 | * Disconnect and destroy endpoint. After this, the only | |
838 | * valid operations on the ep are to free it (if dynamically | |
839 | * allocated) or re-create it. | |
c56c65fb | 840 | */ |
7f1d5419 | 841 | void |
c56c65fb TT |
842 | rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) |
843 | { | |
844 | int rc; | |
845 | ||
846 | dprintk("RPC: %s: entering, connected is %d\n", | |
847 | __func__, ep->rep_connected); | |
848 | ||
254f91e2 CL |
849 | cancel_delayed_work_sync(&ep->rep_connect_worker); |
850 | ||
c56c65fb | 851 | if (ia->ri_id->qp) { |
282191cb | 852 | rpcrdma_ep_disconnect(ep, ia); |
fee08caf TT |
853 | rdma_destroy_qp(ia->ri_id); |
854 | ia->ri_id->qp = NULL; | |
c56c65fb TT |
855 | } |
856 | ||
c05fbb5a | 857 | rpcrdma_free_regbuf(ia, ep->rep_padbuf); |
c56c65fb | 858 | |
fc664485 CL |
859 | rpcrdma_clean_cq(ep->rep_attr.recv_cq); |
860 | rc = ib_destroy_cq(ep->rep_attr.recv_cq); | |
861 | if (rc) | |
862 | dprintk("RPC: %s: ib_destroy_cq returned %i\n", | |
863 | __func__, rc); | |
864 | ||
865 | rpcrdma_clean_cq(ep->rep_attr.send_cq); | |
866 | rc = ib_destroy_cq(ep->rep_attr.send_cq); | |
c56c65fb TT |
867 | if (rc) |
868 | dprintk("RPC: %s: ib_destroy_cq returned %i\n", | |
869 | __func__, rc); | |
c56c65fb TT |
870 | } |
871 | ||
872 | /* | |
873 | * Connect unconnected endpoint. | |
874 | */ | |
875 | int | |
876 | rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) | |
877 | { | |
73806c88 | 878 | struct rdma_cm_id *id, *old; |
c56c65fb TT |
879 | int rc = 0; |
880 | int retry_count = 0; | |
c56c65fb | 881 | |
c055551e | 882 | if (ep->rep_connected != 0) { |
c56c65fb TT |
883 | struct rpcrdma_xprt *xprt; |
884 | retry: | |
ec62f40d | 885 | dprintk("RPC: %s: reconnecting...\n", __func__); |
282191cb CL |
886 | |
887 | rpcrdma_ep_disconnect(ep, ia); | |
a7bc211a | 888 | rpcrdma_flush_cqs(ep); |
c56c65fb TT |
889 | |
890 | xprt = container_of(ia, struct rpcrdma_xprt, rx_ia); | |
891 | id = rpcrdma_create_id(xprt, ia, | |
892 | (struct sockaddr *)&xprt->rx_data.addr); | |
893 | if (IS_ERR(id)) { | |
ec62f40d | 894 | rc = -EHOSTUNREACH; |
c56c65fb TT |
895 | goto out; |
896 | } | |
897 | /* TEMP TEMP TEMP - fail if new device: | |
898 | * Deregister/remarshal *all* requests! | |
899 | * Close and recreate adapter, pd, etc! | |
900 | * Re-determine all attributes still sane! | |
901 | * More stuff I haven't thought of! | |
902 | * Rrrgh! | |
903 | */ | |
89e0d112 | 904 | if (ia->ri_device != id->device) { |
c56c65fb TT |
905 | printk("RPC: %s: can't reconnect on " |
906 | "different device!\n", __func__); | |
907 | rdma_destroy_id(id); | |
ec62f40d | 908 | rc = -ENETUNREACH; |
c56c65fb TT |
909 | goto out; |
910 | } | |
911 | /* END TEMP */ | |
ec62f40d CL |
912 | rc = rdma_create_qp(id, ia->ri_pd, &ep->rep_attr); |
913 | if (rc) { | |
914 | dprintk("RPC: %s: rdma_create_qp failed %i\n", | |
915 | __func__, rc); | |
916 | rdma_destroy_id(id); | |
917 | rc = -ENETUNREACH; | |
918 | goto out; | |
919 | } | |
73806c88 CL |
920 | |
921 | write_lock(&ia->ri_qplock); | |
922 | old = ia->ri_id; | |
c56c65fb | 923 | ia->ri_id = id; |
73806c88 CL |
924 | write_unlock(&ia->ri_qplock); |
925 | ||
926 | rdma_destroy_qp(old); | |
927 | rdma_destroy_id(old); | |
ec62f40d CL |
928 | } else { |
929 | dprintk("RPC: %s: connecting...\n", __func__); | |
930 | rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr); | |
931 | if (rc) { | |
932 | dprintk("RPC: %s: rdma_create_qp failed %i\n", | |
933 | __func__, rc); | |
934 | /* do not update ep->rep_connected */ | |
935 | return -ENETUNREACH; | |
936 | } | |
c56c65fb TT |
937 | } |
938 | ||
c56c65fb TT |
939 | ep->rep_connected = 0; |
940 | ||
941 | rc = rdma_connect(ia->ri_id, &ep->rep_remote_cma); | |
942 | if (rc) { | |
943 | dprintk("RPC: %s: rdma_connect() failed with %i\n", | |
944 | __func__, rc); | |
945 | goto out; | |
946 | } | |
947 | ||
c56c65fb TT |
948 | wait_event_interruptible(ep->rep_connect_wait, ep->rep_connected != 0); |
949 | ||
950 | /* | |
951 | * Check state. A non-peer reject indicates no listener | |
952 | * (ECONNREFUSED), which may be a transient state. All | |
953 | * others indicate a transport condition which has already | |
954 | * undergone a best-effort. | |
955 | */ | |
f64f9e71 JP |
956 | if (ep->rep_connected == -ECONNREFUSED && |
957 | ++retry_count <= RDMA_CONNECT_RETRY_MAX) { | |
c56c65fb TT |
958 | dprintk("RPC: %s: non-peer_reject, retry\n", __func__); |
959 | goto retry; | |
960 | } | |
961 | if (ep->rep_connected <= 0) { | |
962 | /* Sometimes, the only way to reliably connect to remote | |
963 | * CMs is to use same nonzero values for ORD and IRD. */ | |
b334eaab TT |
964 | if (retry_count++ <= RDMA_CONNECT_RETRY_MAX + 1 && |
965 | (ep->rep_remote_cma.responder_resources == 0 || | |
966 | ep->rep_remote_cma.initiator_depth != | |
967 | ep->rep_remote_cma.responder_resources)) { | |
968 | if (ep->rep_remote_cma.responder_resources == 0) | |
969 | ep->rep_remote_cma.responder_resources = 1; | |
970 | ep->rep_remote_cma.initiator_depth = | |
971 | ep->rep_remote_cma.responder_resources; | |
c56c65fb | 972 | goto retry; |
b334eaab | 973 | } |
c56c65fb TT |
974 | rc = ep->rep_connected; |
975 | } else { | |
976 | dprintk("RPC: %s: connected\n", __func__); | |
977 | } | |
978 | ||
979 | out: | |
980 | if (rc) | |
981 | ep->rep_connected = rc; | |
982 | return rc; | |
983 | } | |
984 | ||
985 | /* | |
986 | * rpcrdma_ep_disconnect | |
987 | * | |
988 | * This is separate from destroy to facilitate the ability | |
989 | * to reconnect without recreating the endpoint. | |
990 | * | |
991 | * This call is not reentrant, and must not be made in parallel | |
992 | * on the same endpoint. | |
993 | */ | |
282191cb | 994 | void |
c56c65fb TT |
995 | rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) |
996 | { | |
997 | int rc; | |
998 | ||
a7bc211a | 999 | rpcrdma_flush_cqs(ep); |
c56c65fb TT |
1000 | rc = rdma_disconnect(ia->ri_id); |
1001 | if (!rc) { | |
1002 | /* returns without wait if not connected */ | |
1003 | wait_event_interruptible(ep->rep_connect_wait, | |
1004 | ep->rep_connected != 1); | |
1005 | dprintk("RPC: %s: after wait, %sconnected\n", __func__, | |
1006 | (ep->rep_connected == 1) ? "still " : "dis"); | |
1007 | } else { | |
1008 | dprintk("RPC: %s: rdma_disconnect %i\n", __func__, rc); | |
1009 | ep->rep_connected = rc; | |
1010 | } | |
c56c65fb TT |
1011 | } |
1012 | ||
1392402c CL |
1013 | static struct rpcrdma_req * |
1014 | rpcrdma_create_req(struct rpcrdma_xprt *r_xprt) | |
1015 | { | |
1392402c | 1016 | struct rpcrdma_req *req; |
1392402c | 1017 | |
85275c87 | 1018 | req = kzalloc(sizeof(*req), GFP_KERNEL); |
1392402c | 1019 | if (req == NULL) |
85275c87 | 1020 | return ERR_PTR(-ENOMEM); |
1392402c | 1021 | |
1392402c CL |
1022 | req->rl_buffer = &r_xprt->rx_buf; |
1023 | return req; | |
1392402c CL |
1024 | } |
1025 | ||
1026 | static struct rpcrdma_rep * | |
1027 | rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt) | |
1028 | { | |
1029 | struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data; | |
1392402c CL |
1030 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; |
1031 | struct rpcrdma_rep *rep; | |
1032 | int rc; | |
1033 | ||
1034 | rc = -ENOMEM; | |
6b1184cd | 1035 | rep = kzalloc(sizeof(*rep), GFP_KERNEL); |
1392402c CL |
1036 | if (rep == NULL) |
1037 | goto out; | |
1392402c | 1038 | |
6b1184cd CL |
1039 | rep->rr_rdmabuf = rpcrdma_alloc_regbuf(ia, cdata->inline_rsize, |
1040 | GFP_KERNEL); | |
1041 | if (IS_ERR(rep->rr_rdmabuf)) { | |
1042 | rc = PTR_ERR(rep->rr_rdmabuf); | |
1392402c | 1043 | goto out_free; |
6b1184cd | 1044 | } |
1392402c | 1045 | |
89e0d112 | 1046 | rep->rr_device = ia->ri_device; |
fed171b3 | 1047 | rep->rr_rxprt = r_xprt; |
1392402c CL |
1048 | return rep; |
1049 | ||
1050 | out_free: | |
1051 | kfree(rep); | |
1052 | out: | |
1053 | return ERR_PTR(rc); | |
1054 | } | |
1055 | ||
c56c65fb | 1056 | int |
ac920d04 | 1057 | rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt) |
c56c65fb | 1058 | { |
ac920d04 CL |
1059 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
1060 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; | |
1061 | struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data; | |
c56c65fb | 1062 | char *p; |
1392402c | 1063 | size_t len; |
c56c65fb TT |
1064 | int i, rc; |
1065 | ||
1066 | buf->rb_max_requests = cdata->max_requests; | |
1067 | spin_lock_init(&buf->rb_lock); | |
c56c65fb TT |
1068 | |
1069 | /* Need to allocate: | |
1070 | * 1. arrays for send and recv pointers | |
1071 | * 2. arrays of struct rpcrdma_req to fill in pointers | |
1072 | * 3. array of struct rpcrdma_rep for replies | |
c56c65fb TT |
1073 | * Send/recv buffers in req/rep need to be registered |
1074 | */ | |
c56c65fb TT |
1075 | len = buf->rb_max_requests * |
1076 | (sizeof(struct rpcrdma_req *) + sizeof(struct rpcrdma_rep *)); | |
c56c65fb | 1077 | |
c56c65fb TT |
1078 | p = kzalloc(len, GFP_KERNEL); |
1079 | if (p == NULL) { | |
1080 | dprintk("RPC: %s: req_t/rep_t/pad kzalloc(%zd) failed\n", | |
1081 | __func__, len); | |
1082 | rc = -ENOMEM; | |
1083 | goto out; | |
1084 | } | |
1085 | buf->rb_pool = p; /* for freeing it later */ | |
1086 | ||
1087 | buf->rb_send_bufs = (struct rpcrdma_req **) p; | |
1088 | p = (char *) &buf->rb_send_bufs[buf->rb_max_requests]; | |
1089 | buf->rb_recv_bufs = (struct rpcrdma_rep **) p; | |
1090 | p = (char *) &buf->rb_recv_bufs[buf->rb_max_requests]; | |
1091 | ||
91e70e70 CL |
1092 | rc = ia->ri_ops->ro_init(r_xprt); |
1093 | if (rc) | |
1094 | goto out; | |
c56c65fb | 1095 | |
c56c65fb TT |
1096 | for (i = 0; i < buf->rb_max_requests; i++) { |
1097 | struct rpcrdma_req *req; | |
1098 | struct rpcrdma_rep *rep; | |
1099 | ||
1392402c CL |
1100 | req = rpcrdma_create_req(r_xprt); |
1101 | if (IS_ERR(req)) { | |
c56c65fb TT |
1102 | dprintk("RPC: %s: request buffer %d alloc" |
1103 | " failed\n", __func__, i); | |
1392402c | 1104 | rc = PTR_ERR(req); |
c56c65fb TT |
1105 | goto out; |
1106 | } | |
c56c65fb | 1107 | buf->rb_send_bufs[i] = req; |
c56c65fb | 1108 | |
1392402c CL |
1109 | rep = rpcrdma_create_rep(r_xprt); |
1110 | if (IS_ERR(rep)) { | |
c56c65fb TT |
1111 | dprintk("RPC: %s: reply buffer %d alloc failed\n", |
1112 | __func__, i); | |
1392402c | 1113 | rc = PTR_ERR(rep); |
c56c65fb TT |
1114 | goto out; |
1115 | } | |
c56c65fb | 1116 | buf->rb_recv_bufs[i] = rep; |
c56c65fb | 1117 | } |
1392402c | 1118 | |
c56c65fb TT |
1119 | return 0; |
1120 | out: | |
1121 | rpcrdma_buffer_destroy(buf); | |
1122 | return rc; | |
1123 | } | |
1124 | ||
1392402c CL |
1125 | static void |
1126 | rpcrdma_destroy_rep(struct rpcrdma_ia *ia, struct rpcrdma_rep *rep) | |
1127 | { | |
1128 | if (!rep) | |
1129 | return; | |
1130 | ||
6b1184cd | 1131 | rpcrdma_free_regbuf(ia, rep->rr_rdmabuf); |
1392402c CL |
1132 | kfree(rep); |
1133 | } | |
1134 | ||
1135 | static void | |
1136 | rpcrdma_destroy_req(struct rpcrdma_ia *ia, struct rpcrdma_req *req) | |
1137 | { | |
1138 | if (!req) | |
1139 | return; | |
1140 | ||
0ca77dc3 | 1141 | rpcrdma_free_regbuf(ia, req->rl_sendbuf); |
85275c87 | 1142 | rpcrdma_free_regbuf(ia, req->rl_rdmabuf); |
1392402c CL |
1143 | kfree(req); |
1144 | } | |
1145 | ||
c56c65fb TT |
1146 | void |
1147 | rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf) | |
1148 | { | |
c56c65fb | 1149 | struct rpcrdma_ia *ia = rdmab_to_ia(buf); |
2e84522c | 1150 | int i; |
c56c65fb TT |
1151 | |
1152 | /* clean up in reverse order from create | |
1153 | * 1. recv mr memory (mr free, then kfree) | |
c56c65fb | 1154 | * 2. send mr memory (mr free, then kfree) |
2e84522c | 1155 | * 3. MWs |
c56c65fb TT |
1156 | */ |
1157 | dprintk("RPC: %s: entering\n", __func__); | |
1158 | ||
1159 | for (i = 0; i < buf->rb_max_requests; i++) { | |
1392402c CL |
1160 | if (buf->rb_recv_bufs) |
1161 | rpcrdma_destroy_rep(ia, buf->rb_recv_bufs[i]); | |
1162 | if (buf->rb_send_bufs) | |
1163 | rpcrdma_destroy_req(ia, buf->rb_send_bufs[i]); | |
c56c65fb TT |
1164 | } |
1165 | ||
4561f347 | 1166 | ia->ri_ops->ro_destroy(buf); |
4034ba04 | 1167 | |
c56c65fb TT |
1168 | kfree(buf->rb_pool); |
1169 | } | |
1170 | ||
346aa66b CL |
1171 | struct rpcrdma_mw * |
1172 | rpcrdma_get_mw(struct rpcrdma_xprt *r_xprt) | |
1173 | { | |
1174 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; | |
1175 | struct rpcrdma_mw *mw = NULL; | |
346aa66b | 1176 | |
58d1dcf5 | 1177 | spin_lock(&buf->rb_mwlock); |
346aa66b CL |
1178 | if (!list_empty(&buf->rb_mws)) { |
1179 | mw = list_first_entry(&buf->rb_mws, | |
1180 | struct rpcrdma_mw, mw_list); | |
1181 | list_del_init(&mw->mw_list); | |
1182 | } | |
58d1dcf5 | 1183 | spin_unlock(&buf->rb_mwlock); |
346aa66b CL |
1184 | |
1185 | if (!mw) | |
1186 | pr_err("RPC: %s: no MWs available\n", __func__); | |
1187 | return mw; | |
1188 | } | |
1189 | ||
1190 | void | |
1191 | rpcrdma_put_mw(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mw *mw) | |
1192 | { | |
1193 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; | |
346aa66b | 1194 | |
58d1dcf5 | 1195 | spin_lock(&buf->rb_mwlock); |
346aa66b | 1196 | list_add_tail(&mw->mw_list, &buf->rb_mws); |
58d1dcf5 | 1197 | spin_unlock(&buf->rb_mwlock); |
346aa66b CL |
1198 | } |
1199 | ||
c2922c02 CL |
1200 | static void |
1201 | rpcrdma_buffer_put_sendbuf(struct rpcrdma_req *req, struct rpcrdma_buffer *buf) | |
1202 | { | |
1203 | buf->rb_send_bufs[--buf->rb_send_index] = req; | |
1204 | req->rl_niovs = 0; | |
1205 | if (req->rl_reply) { | |
1206 | buf->rb_recv_bufs[--buf->rb_recv_index] = req->rl_reply; | |
c2922c02 CL |
1207 | req->rl_reply = NULL; |
1208 | } | |
1209 | } | |
1210 | ||
c56c65fb TT |
1211 | /* |
1212 | * Get a set of request/reply buffers. | |
1213 | * | |
1214 | * Reply buffer (if needed) is attached to send buffer upon return. | |
1215 | * Rule: | |
1216 | * rb_send_index and rb_recv_index MUST always be pointing to the | |
1217 | * *next* available buffer (non-NULL). They are incremented after | |
1218 | * removing buffers, and decremented *before* returning them. | |
1219 | */ | |
1220 | struct rpcrdma_req * | |
1221 | rpcrdma_buffer_get(struct rpcrdma_buffer *buffers) | |
1222 | { | |
1223 | struct rpcrdma_req *req; | |
1224 | unsigned long flags; | |
1225 | ||
1226 | spin_lock_irqsave(&buffers->rb_lock, flags); | |
c14d86e5 | 1227 | |
c56c65fb TT |
1228 | if (buffers->rb_send_index == buffers->rb_max_requests) { |
1229 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1230 | dprintk("RPC: %s: out of request buffers\n", __func__); | |
1231 | return ((struct rpcrdma_req *)NULL); | |
1232 | } | |
1233 | ||
1234 | req = buffers->rb_send_bufs[buffers->rb_send_index]; | |
1235 | if (buffers->rb_send_index < buffers->rb_recv_index) { | |
1236 | dprintk("RPC: %s: %d extra receives outstanding (ok)\n", | |
1237 | __func__, | |
1238 | buffers->rb_recv_index - buffers->rb_send_index); | |
1239 | req->rl_reply = NULL; | |
1240 | } else { | |
1241 | req->rl_reply = buffers->rb_recv_bufs[buffers->rb_recv_index]; | |
1242 | buffers->rb_recv_bufs[buffers->rb_recv_index++] = NULL; | |
1243 | } | |
1244 | buffers->rb_send_bufs[buffers->rb_send_index++] = NULL; | |
ddb6bebc | 1245 | |
c56c65fb TT |
1246 | spin_unlock_irqrestore(&buffers->rb_lock, flags); |
1247 | return req; | |
1248 | } | |
1249 | ||
1250 | /* | |
1251 | * Put request/reply buffers back into pool. | |
1252 | * Pre-decrement counter/array index. | |
1253 | */ | |
1254 | void | |
1255 | rpcrdma_buffer_put(struct rpcrdma_req *req) | |
1256 | { | |
1257 | struct rpcrdma_buffer *buffers = req->rl_buffer; | |
c56c65fb TT |
1258 | unsigned long flags; |
1259 | ||
c56c65fb | 1260 | spin_lock_irqsave(&buffers->rb_lock, flags); |
c2922c02 | 1261 | rpcrdma_buffer_put_sendbuf(req, buffers); |
c56c65fb TT |
1262 | spin_unlock_irqrestore(&buffers->rb_lock, flags); |
1263 | } | |
1264 | ||
1265 | /* | |
1266 | * Recover reply buffers from pool. | |
1267 | * This happens when recovering from error conditions. | |
1268 | * Post-increment counter/array index. | |
1269 | */ | |
1270 | void | |
1271 | rpcrdma_recv_buffer_get(struct rpcrdma_req *req) | |
1272 | { | |
1273 | struct rpcrdma_buffer *buffers = req->rl_buffer; | |
1274 | unsigned long flags; | |
1275 | ||
c56c65fb TT |
1276 | spin_lock_irqsave(&buffers->rb_lock, flags); |
1277 | if (buffers->rb_recv_index < buffers->rb_max_requests) { | |
1278 | req->rl_reply = buffers->rb_recv_bufs[buffers->rb_recv_index]; | |
1279 | buffers->rb_recv_bufs[buffers->rb_recv_index++] = NULL; | |
1280 | } | |
1281 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1282 | } | |
1283 | ||
1284 | /* | |
1285 | * Put reply buffers back into pool when not attached to | |
b45ccfd2 | 1286 | * request. This happens in error conditions. |
c56c65fb TT |
1287 | */ |
1288 | void | |
1289 | rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep) | |
1290 | { | |
fed171b3 | 1291 | struct rpcrdma_buffer *buffers = &rep->rr_rxprt->rx_buf; |
c56c65fb TT |
1292 | unsigned long flags; |
1293 | ||
c56c65fb TT |
1294 | spin_lock_irqsave(&buffers->rb_lock, flags); |
1295 | buffers->rb_recv_bufs[--buffers->rb_recv_index] = rep; | |
1296 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1297 | } | |
1298 | ||
1299 | /* | |
1300 | * Wrappers for internal-use kmalloc memory registration, used by buffer code. | |
1301 | */ | |
1302 | ||
d654788e CL |
1303 | void |
1304 | rpcrdma_mapping_error(struct rpcrdma_mr_seg *seg) | |
1305 | { | |
1306 | dprintk("RPC: map_one: offset %p iova %llx len %zu\n", | |
1307 | seg->mr_offset, | |
1308 | (unsigned long long)seg->mr_dma, seg->mr_dmalen); | |
1309 | } | |
1310 | ||
df515ca7 | 1311 | static int |
c56c65fb TT |
1312 | rpcrdma_register_internal(struct rpcrdma_ia *ia, void *va, int len, |
1313 | struct ib_mr **mrp, struct ib_sge *iov) | |
1314 | { | |
1315 | struct ib_phys_buf ipb; | |
1316 | struct ib_mr *mr; | |
1317 | int rc; | |
1318 | ||
1319 | /* | |
1320 | * All memory passed here was kmalloc'ed, therefore phys-contiguous. | |
1321 | */ | |
89e0d112 | 1322 | iov->addr = ib_dma_map_single(ia->ri_device, |
c56c65fb | 1323 | va, len, DMA_BIDIRECTIONAL); |
89e0d112 | 1324 | if (ib_dma_mapping_error(ia->ri_device, iov->addr)) |
bf858ab0 YB |
1325 | return -ENOMEM; |
1326 | ||
c56c65fb TT |
1327 | iov->length = len; |
1328 | ||
bd7ed1d1 TT |
1329 | if (ia->ri_have_dma_lkey) { |
1330 | *mrp = NULL; | |
1331 | iov->lkey = ia->ri_dma_lkey; | |
1332 | return 0; | |
1333 | } else if (ia->ri_bind_mem != NULL) { | |
c56c65fb TT |
1334 | *mrp = NULL; |
1335 | iov->lkey = ia->ri_bind_mem->lkey; | |
1336 | return 0; | |
1337 | } | |
1338 | ||
1339 | ipb.addr = iov->addr; | |
1340 | ipb.size = iov->length; | |
1341 | mr = ib_reg_phys_mr(ia->ri_pd, &ipb, 1, | |
1342 | IB_ACCESS_LOCAL_WRITE, &iov->addr); | |
1343 | ||
1344 | dprintk("RPC: %s: phys convert: 0x%llx " | |
1345 | "registered 0x%llx length %d\n", | |
a56daeb7 AM |
1346 | __func__, (unsigned long long)ipb.addr, |
1347 | (unsigned long long)iov->addr, len); | |
c56c65fb TT |
1348 | |
1349 | if (IS_ERR(mr)) { | |
1350 | *mrp = NULL; | |
1351 | rc = PTR_ERR(mr); | |
1352 | dprintk("RPC: %s: failed with %i\n", __func__, rc); | |
1353 | } else { | |
1354 | *mrp = mr; | |
1355 | iov->lkey = mr->lkey; | |
1356 | rc = 0; | |
1357 | } | |
1358 | ||
1359 | return rc; | |
1360 | } | |
1361 | ||
df515ca7 | 1362 | static int |
c56c65fb TT |
1363 | rpcrdma_deregister_internal(struct rpcrdma_ia *ia, |
1364 | struct ib_mr *mr, struct ib_sge *iov) | |
1365 | { | |
1366 | int rc; | |
1367 | ||
89e0d112 CL |
1368 | ib_dma_unmap_single(ia->ri_device, |
1369 | iov->addr, iov->length, DMA_BIDIRECTIONAL); | |
c56c65fb TT |
1370 | |
1371 | if (NULL == mr) | |
1372 | return 0; | |
1373 | ||
1374 | rc = ib_dereg_mr(mr); | |
1375 | if (rc) | |
1376 | dprintk("RPC: %s: ib_dereg_mr failed %i\n", __func__, rc); | |
1377 | return rc; | |
1378 | } | |
1379 | ||
9128c3e7 CL |
1380 | /** |
1381 | * rpcrdma_alloc_regbuf - kmalloc and register memory for SEND/RECV buffers | |
1382 | * @ia: controlling rpcrdma_ia | |
1383 | * @size: size of buffer to be allocated, in bytes | |
1384 | * @flags: GFP flags | |
1385 | * | |
1386 | * Returns pointer to private header of an area of internally | |
1387 | * registered memory, or an ERR_PTR. The registered buffer follows | |
1388 | * the end of the private header. | |
1389 | * | |
1390 | * xprtrdma uses a regbuf for posting an outgoing RDMA SEND, or for | |
1391 | * receiving the payload of RDMA RECV operations. regbufs are not | |
1392 | * used for RDMA READ/WRITE operations, thus are registered only for | |
1393 | * LOCAL access. | |
1394 | */ | |
1395 | struct rpcrdma_regbuf * | |
1396 | rpcrdma_alloc_regbuf(struct rpcrdma_ia *ia, size_t size, gfp_t flags) | |
1397 | { | |
1398 | struct rpcrdma_regbuf *rb; | |
1399 | int rc; | |
1400 | ||
1401 | rc = -ENOMEM; | |
1402 | rb = kmalloc(sizeof(*rb) + size, flags); | |
1403 | if (rb == NULL) | |
1404 | goto out; | |
1405 | ||
1406 | rb->rg_size = size; | |
1407 | rb->rg_owner = NULL; | |
1408 | rc = rpcrdma_register_internal(ia, rb->rg_base, size, | |
1409 | &rb->rg_mr, &rb->rg_iov); | |
1410 | if (rc) | |
1411 | goto out_free; | |
1412 | ||
1413 | return rb; | |
1414 | ||
1415 | out_free: | |
1416 | kfree(rb); | |
1417 | out: | |
1418 | return ERR_PTR(rc); | |
1419 | } | |
1420 | ||
1421 | /** | |
1422 | * rpcrdma_free_regbuf - deregister and free registered buffer | |
1423 | * @ia: controlling rpcrdma_ia | |
1424 | * @rb: regbuf to be deregistered and freed | |
1425 | */ | |
1426 | void | |
1427 | rpcrdma_free_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb) | |
1428 | { | |
1429 | if (rb) { | |
1430 | rpcrdma_deregister_internal(ia, rb->rg_mr, &rb->rg_iov); | |
1431 | kfree(rb); | |
1432 | } | |
1433 | } | |
1434 | ||
c56c65fb TT |
1435 | /* |
1436 | * Prepost any receive buffer, then post send. | |
1437 | * | |
1438 | * Receive buffer is donated to hardware, reclaimed upon recv completion. | |
1439 | */ | |
1440 | int | |
1441 | rpcrdma_ep_post(struct rpcrdma_ia *ia, | |
1442 | struct rpcrdma_ep *ep, | |
1443 | struct rpcrdma_req *req) | |
1444 | { | |
1445 | struct ib_send_wr send_wr, *send_wr_fail; | |
1446 | struct rpcrdma_rep *rep = req->rl_reply; | |
1447 | int rc; | |
1448 | ||
1449 | if (rep) { | |
1450 | rc = rpcrdma_ep_post_recv(ia, ep, rep); | |
1451 | if (rc) | |
1452 | goto out; | |
1453 | req->rl_reply = NULL; | |
1454 | } | |
1455 | ||
1456 | send_wr.next = NULL; | |
e46ac34c | 1457 | send_wr.wr_id = RPCRDMA_IGNORE_COMPLETION; |
c56c65fb TT |
1458 | send_wr.sg_list = req->rl_send_iov; |
1459 | send_wr.num_sge = req->rl_niovs; | |
1460 | send_wr.opcode = IB_WR_SEND; | |
c56c65fb | 1461 | if (send_wr.num_sge == 4) /* no need to sync any pad (constant) */ |
89e0d112 CL |
1462 | ib_dma_sync_single_for_device(ia->ri_device, |
1463 | req->rl_send_iov[3].addr, | |
1464 | req->rl_send_iov[3].length, | |
1465 | DMA_TO_DEVICE); | |
1466 | ib_dma_sync_single_for_device(ia->ri_device, | |
1467 | req->rl_send_iov[1].addr, | |
1468 | req->rl_send_iov[1].length, | |
1469 | DMA_TO_DEVICE); | |
1470 | ib_dma_sync_single_for_device(ia->ri_device, | |
1471 | req->rl_send_iov[0].addr, | |
1472 | req->rl_send_iov[0].length, | |
1473 | DMA_TO_DEVICE); | |
c56c65fb TT |
1474 | |
1475 | if (DECR_CQCOUNT(ep) > 0) | |
1476 | send_wr.send_flags = 0; | |
1477 | else { /* Provider must take a send completion every now and then */ | |
1478 | INIT_CQCOUNT(ep); | |
1479 | send_wr.send_flags = IB_SEND_SIGNALED; | |
1480 | } | |
1481 | ||
1482 | rc = ib_post_send(ia->ri_id->qp, &send_wr, &send_wr_fail); | |
1483 | if (rc) | |
1484 | dprintk("RPC: %s: ib_post_send returned %i\n", __func__, | |
1485 | rc); | |
1486 | out: | |
1487 | return rc; | |
1488 | } | |
1489 | ||
1490 | /* | |
1491 | * (Re)post a receive buffer. | |
1492 | */ | |
1493 | int | |
1494 | rpcrdma_ep_post_recv(struct rpcrdma_ia *ia, | |
1495 | struct rpcrdma_ep *ep, | |
1496 | struct rpcrdma_rep *rep) | |
1497 | { | |
1498 | struct ib_recv_wr recv_wr, *recv_wr_fail; | |
1499 | int rc; | |
1500 | ||
1501 | recv_wr.next = NULL; | |
1502 | recv_wr.wr_id = (u64) (unsigned long) rep; | |
6b1184cd | 1503 | recv_wr.sg_list = &rep->rr_rdmabuf->rg_iov; |
c56c65fb TT |
1504 | recv_wr.num_sge = 1; |
1505 | ||
89e0d112 | 1506 | ib_dma_sync_single_for_cpu(ia->ri_device, |
6b1184cd CL |
1507 | rdmab_addr(rep->rr_rdmabuf), |
1508 | rdmab_length(rep->rr_rdmabuf), | |
1509 | DMA_BIDIRECTIONAL); | |
c56c65fb | 1510 | |
c56c65fb TT |
1511 | rc = ib_post_recv(ia->ri_id->qp, &recv_wr, &recv_wr_fail); |
1512 | ||
1513 | if (rc) | |
1514 | dprintk("RPC: %s: ib_post_recv returned %i\n", __func__, | |
1515 | rc); | |
1516 | return rc; | |
1517 | } | |
43e95988 | 1518 | |
1c9351ee | 1519 | /* How many chunk list items fit within our inline buffers? |
43e95988 | 1520 | */ |
1c9351ee CL |
1521 | unsigned int |
1522 | rpcrdma_max_segments(struct rpcrdma_xprt *r_xprt) | |
43e95988 CL |
1523 | { |
1524 | struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data; | |
1c9351ee | 1525 | int bytes, segments; |
43e95988 | 1526 | |
1c9351ee CL |
1527 | bytes = min_t(unsigned int, cdata->inline_wsize, cdata->inline_rsize); |
1528 | bytes -= RPCRDMA_HDRLEN_MIN; | |
1529 | if (bytes < sizeof(struct rpcrdma_segment) * 2) { | |
1530 | pr_warn("RPC: %s: inline threshold too small\n", | |
1531 | __func__); | |
1532 | return 0; | |
43e95988 | 1533 | } |
1c9351ee CL |
1534 | |
1535 | segments = 1 << (fls(bytes / sizeof(struct rpcrdma_segment)) - 1); | |
1536 | dprintk("RPC: %s: max chunk list size = %d segments\n", | |
1537 | __func__, segments); | |
1538 | return segments; | |
43e95988 | 1539 | } |