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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; | |
83 | void (*func)(struct rpcrdma_rep *); | |
84 | unsigned long flags; | |
85 | ||
86 | data = data; | |
87 | spin_lock_irqsave(&rpcrdma_tk_lock_g, flags); | |
88 | while (!list_empty(&rpcrdma_tasklets_g)) { | |
89 | rep = list_entry(rpcrdma_tasklets_g.next, | |
90 | struct rpcrdma_rep, rr_list); | |
91 | list_del(&rep->rr_list); | |
92 | func = rep->rr_func; | |
93 | rep->rr_func = NULL; | |
94 | spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags); | |
95 | ||
96 | if (func) | |
97 | func(rep); | |
98 | else | |
99 | rpcrdma_recv_buffer_put(rep); | |
100 | ||
101 | spin_lock_irqsave(&rpcrdma_tk_lock_g, flags); | |
102 | } | |
103 | spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags); | |
104 | } | |
105 | ||
106 | static DECLARE_TASKLET(rpcrdma_tasklet_g, rpcrdma_run_tasklet, 0UL); | |
107 | ||
7ff11de1 CL |
108 | static const char * const async_event[] = { |
109 | "CQ error", | |
110 | "QP fatal error", | |
111 | "QP request error", | |
112 | "QP access error", | |
113 | "communication established", | |
114 | "send queue drained", | |
115 | "path migration successful", | |
116 | "path mig error", | |
117 | "device fatal error", | |
118 | "port active", | |
119 | "port error", | |
120 | "LID change", | |
121 | "P_key change", | |
122 | "SM change", | |
123 | "SRQ error", | |
124 | "SRQ limit reached", | |
125 | "last WQE reached", | |
126 | "client reregister", | |
127 | "GID change", | |
128 | }; | |
129 | ||
130 | #define ASYNC_MSG(status) \ | |
131 | ((status) < ARRAY_SIZE(async_event) ? \ | |
132 | async_event[(status)] : "unknown async error") | |
133 | ||
f1a03b76 CL |
134 | static void |
135 | rpcrdma_schedule_tasklet(struct list_head *sched_list) | |
136 | { | |
137 | unsigned long flags; | |
138 | ||
139 | spin_lock_irqsave(&rpcrdma_tk_lock_g, flags); | |
140 | list_splice_tail(sched_list, &rpcrdma_tasklets_g); | |
141 | spin_unlock_irqrestore(&rpcrdma_tk_lock_g, flags); | |
142 | tasklet_schedule(&rpcrdma_tasklet_g); | |
143 | } | |
144 | ||
c56c65fb TT |
145 | static void |
146 | rpcrdma_qp_async_error_upcall(struct ib_event *event, void *context) | |
147 | { | |
148 | struct rpcrdma_ep *ep = context; | |
149 | ||
7ff11de1 CL |
150 | pr_err("RPC: %s: %s on device %s ep %p\n", |
151 | __func__, ASYNC_MSG(event->event), | |
152 | event->device->name, context); | |
c56c65fb TT |
153 | if (ep->rep_connected == 1) { |
154 | ep->rep_connected = -EIO; | |
afadc468 | 155 | rpcrdma_conn_func(ep); |
c56c65fb TT |
156 | wake_up_all(&ep->rep_connect_wait); |
157 | } | |
158 | } | |
159 | ||
160 | static void | |
161 | rpcrdma_cq_async_error_upcall(struct ib_event *event, void *context) | |
162 | { | |
163 | struct rpcrdma_ep *ep = context; | |
164 | ||
7ff11de1 CL |
165 | pr_err("RPC: %s: %s on device %s ep %p\n", |
166 | __func__, ASYNC_MSG(event->event), | |
167 | event->device->name, context); | |
c56c65fb TT |
168 | if (ep->rep_connected == 1) { |
169 | ep->rep_connected = -EIO; | |
afadc468 | 170 | rpcrdma_conn_func(ep); |
c56c65fb TT |
171 | wake_up_all(&ep->rep_connect_wait); |
172 | } | |
173 | } | |
174 | ||
8502427c CL |
175 | static const char * const wc_status[] = { |
176 | "success", | |
177 | "local length error", | |
178 | "local QP operation error", | |
179 | "local EE context operation error", | |
180 | "local protection error", | |
181 | "WR flushed", | |
182 | "memory management operation error", | |
183 | "bad response error", | |
184 | "local access error", | |
185 | "remote invalid request error", | |
186 | "remote access error", | |
187 | "remote operation error", | |
188 | "transport retry counter exceeded", | |
189 | "RNR retrycounter exceeded", | |
190 | "local RDD violation error", | |
191 | "remove invalid RD request", | |
192 | "operation aborted", | |
193 | "invalid EE context number", | |
194 | "invalid EE context state", | |
195 | "fatal error", | |
196 | "response timeout error", | |
197 | "general error", | |
198 | }; | |
199 | ||
200 | #define COMPLETION_MSG(status) \ | |
201 | ((status) < ARRAY_SIZE(wc_status) ? \ | |
202 | wc_status[(status)] : "unexpected completion error") | |
203 | ||
fc664485 CL |
204 | static void |
205 | rpcrdma_sendcq_process_wc(struct ib_wc *wc) | |
c56c65fb | 206 | { |
8502427c | 207 | if (likely(wc->status == IB_WC_SUCCESS)) |
c56c65fb | 208 | return; |
8502427c CL |
209 | |
210 | /* WARNING: Only wr_id and status are reliable at this point */ | |
211 | if (wc->wr_id == 0ULL) { | |
212 | if (wc->status != IB_WC_WR_FLUSH_ERR) | |
213 | pr_err("RPC: %s: SEND: %s\n", | |
214 | __func__, COMPLETION_MSG(wc->status)); | |
215 | } else { | |
216 | struct rpcrdma_mw *r; | |
217 | ||
218 | r = (struct rpcrdma_mw *)(unsigned long)wc->wr_id; | |
219 | r->r.frmr.fr_state = FRMR_IS_STALE; | |
220 | pr_err("RPC: %s: frmr %p (stale): %s\n", | |
221 | __func__, r, COMPLETION_MSG(wc->status)); | |
222 | } | |
c56c65fb TT |
223 | } |
224 | ||
fc664485 | 225 | static int |
1c00dd07 | 226 | rpcrdma_sendcq_poll(struct ib_cq *cq, struct rpcrdma_ep *ep) |
c56c65fb | 227 | { |
1c00dd07 | 228 | struct ib_wc *wcs; |
8301a2c0 | 229 | int budget, count, rc; |
c56c65fb | 230 | |
8301a2c0 | 231 | budget = RPCRDMA_WC_BUDGET / RPCRDMA_POLLSIZE; |
1c00dd07 CL |
232 | do { |
233 | wcs = ep->rep_send_wcs; | |
234 | ||
235 | rc = ib_poll_cq(cq, RPCRDMA_POLLSIZE, wcs); | |
236 | if (rc <= 0) | |
237 | return rc; | |
238 | ||
239 | count = rc; | |
240 | while (count-- > 0) | |
241 | rpcrdma_sendcq_process_wc(wcs++); | |
8301a2c0 | 242 | } while (rc == RPCRDMA_POLLSIZE && --budget); |
1c00dd07 | 243 | return 0; |
fc664485 | 244 | } |
c56c65fb | 245 | |
fc664485 CL |
246 | /* |
247 | * Handle send, fast_reg_mr, and local_inv completions. | |
248 | * | |
249 | * Send events are typically suppressed and thus do not result | |
250 | * in an upcall. Occasionally one is signaled, however. This | |
251 | * prevents the provider's completion queue from wrapping and | |
252 | * losing a completion. | |
253 | */ | |
254 | static void | |
255 | rpcrdma_sendcq_upcall(struct ib_cq *cq, void *cq_context) | |
256 | { | |
1c00dd07 | 257 | struct rpcrdma_ep *ep = (struct rpcrdma_ep *)cq_context; |
fc664485 CL |
258 | int rc; |
259 | ||
1c00dd07 | 260 | rc = rpcrdma_sendcq_poll(cq, ep); |
fc664485 CL |
261 | if (rc) { |
262 | dprintk("RPC: %s: ib_poll_cq failed: %i\n", | |
263 | __func__, rc); | |
264 | return; | |
c56c65fb TT |
265 | } |
266 | ||
7f23f6f6 CL |
267 | rc = ib_req_notify_cq(cq, |
268 | IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS); | |
269 | if (rc == 0) | |
270 | return; | |
271 | if (rc < 0) { | |
fc664485 CL |
272 | dprintk("RPC: %s: ib_req_notify_cq failed: %i\n", |
273 | __func__, rc); | |
274 | return; | |
275 | } | |
276 | ||
1c00dd07 | 277 | rpcrdma_sendcq_poll(cq, ep); |
fc664485 CL |
278 | } |
279 | ||
280 | static void | |
bb96193d | 281 | rpcrdma_recvcq_process_wc(struct ib_wc *wc, struct list_head *sched_list) |
fc664485 CL |
282 | { |
283 | struct rpcrdma_rep *rep = | |
284 | (struct rpcrdma_rep *)(unsigned long)wc->wr_id; | |
285 | ||
8502427c CL |
286 | /* WARNING: Only wr_id and status are reliable at this point */ |
287 | if (wc->status != IB_WC_SUCCESS) | |
288 | goto out_fail; | |
fc664485 | 289 | |
8502427c | 290 | /* status == SUCCESS means all fields in wc are trustworthy */ |
fc664485 CL |
291 | if (wc->opcode != IB_WC_RECV) |
292 | return; | |
293 | ||
8502427c CL |
294 | dprintk("RPC: %s: rep %p opcode 'recv', length %u: success\n", |
295 | __func__, rep, wc->byte_len); | |
296 | ||
fc664485 CL |
297 | rep->rr_len = wc->byte_len; |
298 | ib_dma_sync_single_for_cpu(rdmab_to_ia(rep->rr_buffer)->ri_id->device, | |
6b1184cd CL |
299 | rdmab_addr(rep->rr_rdmabuf), |
300 | rep->rr_len, DMA_FROM_DEVICE); | |
301 | prefetch(rdmab_to_msg(rep->rr_rdmabuf)); | |
fc664485 CL |
302 | |
303 | out_schedule: | |
bb96193d | 304 | list_add_tail(&rep->rr_list, sched_list); |
8502427c CL |
305 | return; |
306 | out_fail: | |
307 | if (wc->status != IB_WC_WR_FLUSH_ERR) | |
308 | pr_err("RPC: %s: rep %p: %s\n", | |
309 | __func__, rep, COMPLETION_MSG(wc->status)); | |
310 | rep->rr_len = ~0U; | |
311 | goto out_schedule; | |
fc664485 CL |
312 | } |
313 | ||
314 | static int | |
1c00dd07 | 315 | rpcrdma_recvcq_poll(struct ib_cq *cq, struct rpcrdma_ep *ep) |
fc664485 | 316 | { |
bb96193d | 317 | struct list_head sched_list; |
1c00dd07 | 318 | struct ib_wc *wcs; |
8301a2c0 | 319 | int budget, count, rc; |
fc664485 | 320 | |
bb96193d | 321 | INIT_LIST_HEAD(&sched_list); |
8301a2c0 | 322 | budget = RPCRDMA_WC_BUDGET / RPCRDMA_POLLSIZE; |
1c00dd07 CL |
323 | do { |
324 | wcs = ep->rep_recv_wcs; | |
325 | ||
326 | rc = ib_poll_cq(cq, RPCRDMA_POLLSIZE, wcs); | |
327 | if (rc <= 0) | |
bb96193d | 328 | goto out_schedule; |
1c00dd07 CL |
329 | |
330 | count = rc; | |
331 | while (count-- > 0) | |
bb96193d | 332 | rpcrdma_recvcq_process_wc(wcs++, &sched_list); |
8301a2c0 | 333 | } while (rc == RPCRDMA_POLLSIZE && --budget); |
bb96193d CL |
334 | rc = 0; |
335 | ||
336 | out_schedule: | |
f1a03b76 | 337 | rpcrdma_schedule_tasklet(&sched_list); |
bb96193d | 338 | return rc; |
c56c65fb TT |
339 | } |
340 | ||
341 | /* | |
fc664485 | 342 | * Handle receive completions. |
c56c65fb | 343 | * |
c56c65fb TT |
344 | * It is reentrant but processes single events in order to maintain |
345 | * ordering of receives to keep server credits. | |
346 | * | |
347 | * It is the responsibility of the scheduled tasklet to return | |
348 | * recv buffers to the pool. NOTE: this affects synchronization of | |
349 | * connection shutdown. That is, the structures required for | |
350 | * the completion of the reply handler must remain intact until | |
351 | * all memory has been reclaimed. | |
c56c65fb TT |
352 | */ |
353 | static void | |
fc664485 | 354 | rpcrdma_recvcq_upcall(struct ib_cq *cq, void *cq_context) |
c56c65fb | 355 | { |
1c00dd07 | 356 | struct rpcrdma_ep *ep = (struct rpcrdma_ep *)cq_context; |
c56c65fb TT |
357 | int rc; |
358 | ||
1c00dd07 | 359 | rc = rpcrdma_recvcq_poll(cq, ep); |
fc664485 CL |
360 | if (rc) { |
361 | dprintk("RPC: %s: ib_poll_cq failed: %i\n", | |
362 | __func__, rc); | |
c56c65fb | 363 | return; |
fc664485 | 364 | } |
c56c65fb | 365 | |
7f23f6f6 CL |
366 | rc = ib_req_notify_cq(cq, |
367 | IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS); | |
368 | if (rc == 0) | |
369 | return; | |
370 | if (rc < 0) { | |
fc664485 | 371 | dprintk("RPC: %s: ib_req_notify_cq failed: %i\n", |
c56c65fb TT |
372 | __func__, rc); |
373 | return; | |
374 | } | |
375 | ||
1c00dd07 | 376 | rpcrdma_recvcq_poll(cq, ep); |
c56c65fb TT |
377 | } |
378 | ||
a7bc211a CL |
379 | static void |
380 | rpcrdma_flush_cqs(struct rpcrdma_ep *ep) | |
381 | { | |
5c166bef CL |
382 | struct ib_wc wc; |
383 | LIST_HEAD(sched_list); | |
384 | ||
385 | while (ib_poll_cq(ep->rep_attr.recv_cq, 1, &wc) > 0) | |
386 | rpcrdma_recvcq_process_wc(&wc, &sched_list); | |
387 | if (!list_empty(&sched_list)) | |
388 | rpcrdma_schedule_tasklet(&sched_list); | |
389 | while (ib_poll_cq(ep->rep_attr.send_cq, 1, &wc) > 0) | |
390 | rpcrdma_sendcq_process_wc(&wc); | |
a7bc211a CL |
391 | } |
392 | ||
f895b252 | 393 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
c56c65fb TT |
394 | static const char * const conn[] = { |
395 | "address resolved", | |
396 | "address error", | |
397 | "route resolved", | |
398 | "route error", | |
399 | "connect request", | |
400 | "connect response", | |
401 | "connect error", | |
402 | "unreachable", | |
403 | "rejected", | |
404 | "established", | |
405 | "disconnected", | |
8079fb78 CL |
406 | "device removal", |
407 | "multicast join", | |
408 | "multicast error", | |
409 | "address change", | |
410 | "timewait exit", | |
c56c65fb | 411 | }; |
8079fb78 CL |
412 | |
413 | #define CONNECTION_MSG(status) \ | |
414 | ((status) < ARRAY_SIZE(conn) ? \ | |
415 | conn[(status)] : "unrecognized connection error") | |
c56c65fb TT |
416 | #endif |
417 | ||
418 | static int | |
419 | rpcrdma_conn_upcall(struct rdma_cm_id *id, struct rdma_cm_event *event) | |
420 | { | |
421 | struct rpcrdma_xprt *xprt = id->context; | |
422 | struct rpcrdma_ia *ia = &xprt->rx_ia; | |
423 | struct rpcrdma_ep *ep = &xprt->rx_ep; | |
f895b252 | 424 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
0dd39cae | 425 | struct sockaddr *sap = (struct sockaddr *)&ep->rep_remote_addr; |
ff0db049 | 426 | #endif |
ce1ab9ab CL |
427 | struct ib_qp_attr *attr = &ia->ri_qp_attr; |
428 | struct ib_qp_init_attr *iattr = &ia->ri_qp_init_attr; | |
c56c65fb TT |
429 | int connstate = 0; |
430 | ||
431 | switch (event->event) { | |
432 | case RDMA_CM_EVENT_ADDR_RESOLVED: | |
433 | case RDMA_CM_EVENT_ROUTE_RESOLVED: | |
5675add3 | 434 | ia->ri_async_rc = 0; |
c56c65fb TT |
435 | complete(&ia->ri_done); |
436 | break; | |
437 | case RDMA_CM_EVENT_ADDR_ERROR: | |
438 | ia->ri_async_rc = -EHOSTUNREACH; | |
439 | dprintk("RPC: %s: CM address resolution error, ep 0x%p\n", | |
440 | __func__, ep); | |
441 | complete(&ia->ri_done); | |
442 | break; | |
443 | case RDMA_CM_EVENT_ROUTE_ERROR: | |
444 | ia->ri_async_rc = -ENETUNREACH; | |
445 | dprintk("RPC: %s: CM route resolution error, ep 0x%p\n", | |
446 | __func__, ep); | |
447 | complete(&ia->ri_done); | |
448 | break; | |
449 | case RDMA_CM_EVENT_ESTABLISHED: | |
450 | connstate = 1; | |
ce1ab9ab CL |
451 | ib_query_qp(ia->ri_id->qp, attr, |
452 | IB_QP_MAX_QP_RD_ATOMIC | IB_QP_MAX_DEST_RD_ATOMIC, | |
453 | iattr); | |
c56c65fb TT |
454 | dprintk("RPC: %s: %d responder resources" |
455 | " (%d initiator)\n", | |
ce1ab9ab CL |
456 | __func__, attr->max_dest_rd_atomic, |
457 | attr->max_rd_atomic); | |
c56c65fb TT |
458 | goto connected; |
459 | case RDMA_CM_EVENT_CONNECT_ERROR: | |
460 | connstate = -ENOTCONN; | |
461 | goto connected; | |
462 | case RDMA_CM_EVENT_UNREACHABLE: | |
463 | connstate = -ENETDOWN; | |
464 | goto connected; | |
465 | case RDMA_CM_EVENT_REJECTED: | |
466 | connstate = -ECONNREFUSED; | |
467 | goto connected; | |
468 | case RDMA_CM_EVENT_DISCONNECTED: | |
469 | connstate = -ECONNABORTED; | |
470 | goto connected; | |
471 | case RDMA_CM_EVENT_DEVICE_REMOVAL: | |
472 | connstate = -ENODEV; | |
473 | connected: | |
c56c65fb TT |
474 | dprintk("RPC: %s: %sconnected\n", |
475 | __func__, connstate > 0 ? "" : "dis"); | |
476 | ep->rep_connected = connstate; | |
afadc468 | 477 | rpcrdma_conn_func(ep); |
c56c65fb | 478 | wake_up_all(&ep->rep_connect_wait); |
8079fb78 | 479 | /*FALLTHROUGH*/ |
c56c65fb | 480 | default: |
0dd39cae CL |
481 | dprintk("RPC: %s: %pIS:%u (ep 0x%p): %s\n", |
482 | __func__, sap, rpc_get_port(sap), ep, | |
8079fb78 | 483 | CONNECTION_MSG(event->event)); |
c56c65fb TT |
484 | break; |
485 | } | |
486 | ||
f895b252 | 487 | #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
b3cd8d45 | 488 | if (connstate == 1) { |
ce1ab9ab | 489 | int ird = attr->max_dest_rd_atomic; |
b3cd8d45 | 490 | int tird = ep->rep_remote_cma.responder_resources; |
0dd39cae | 491 | |
a0ce85f5 | 492 | pr_info("rpcrdma: connection to %pIS:%u on %s, memreg '%s', %d credits, %d responders%s\n", |
0dd39cae | 493 | sap, rpc_get_port(sap), |
b3cd8d45 | 494 | ia->ri_id->device->name, |
a0ce85f5 | 495 | ia->ri_ops->ro_displayname, |
b3cd8d45 TT |
496 | xprt->rx_buf.rb_max_requests, |
497 | ird, ird < 4 && ird < tird / 2 ? " (low!)" : ""); | |
498 | } else if (connstate < 0) { | |
0dd39cae CL |
499 | pr_info("rpcrdma: connection to %pIS:%u closed (%d)\n", |
500 | sap, rpc_get_port(sap), connstate); | |
b3cd8d45 TT |
501 | } |
502 | #endif | |
503 | ||
c56c65fb TT |
504 | return 0; |
505 | } | |
506 | ||
507 | static struct rdma_cm_id * | |
508 | rpcrdma_create_id(struct rpcrdma_xprt *xprt, | |
509 | struct rpcrdma_ia *ia, struct sockaddr *addr) | |
510 | { | |
511 | struct rdma_cm_id *id; | |
512 | int rc; | |
513 | ||
1a954051 TT |
514 | init_completion(&ia->ri_done); |
515 | ||
b26f9b99 | 516 | id = rdma_create_id(rpcrdma_conn_upcall, xprt, RDMA_PS_TCP, IB_QPT_RC); |
c56c65fb TT |
517 | if (IS_ERR(id)) { |
518 | rc = PTR_ERR(id); | |
519 | dprintk("RPC: %s: rdma_create_id() failed %i\n", | |
520 | __func__, rc); | |
521 | return id; | |
522 | } | |
523 | ||
5675add3 | 524 | ia->ri_async_rc = -ETIMEDOUT; |
c56c65fb TT |
525 | rc = rdma_resolve_addr(id, NULL, addr, RDMA_RESOLVE_TIMEOUT); |
526 | if (rc) { | |
527 | dprintk("RPC: %s: rdma_resolve_addr() failed %i\n", | |
528 | __func__, rc); | |
529 | goto out; | |
530 | } | |
5675add3 TT |
531 | wait_for_completion_interruptible_timeout(&ia->ri_done, |
532 | msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1); | |
c56c65fb TT |
533 | rc = ia->ri_async_rc; |
534 | if (rc) | |
535 | goto out; | |
536 | ||
5675add3 | 537 | ia->ri_async_rc = -ETIMEDOUT; |
c56c65fb TT |
538 | rc = rdma_resolve_route(id, RDMA_RESOLVE_TIMEOUT); |
539 | if (rc) { | |
540 | dprintk("RPC: %s: rdma_resolve_route() failed %i\n", | |
541 | __func__, rc); | |
542 | goto out; | |
543 | } | |
5675add3 TT |
544 | wait_for_completion_interruptible_timeout(&ia->ri_done, |
545 | msecs_to_jiffies(RDMA_RESOLVE_TIMEOUT) + 1); | |
c56c65fb TT |
546 | rc = ia->ri_async_rc; |
547 | if (rc) | |
548 | goto out; | |
549 | ||
550 | return id; | |
551 | ||
552 | out: | |
553 | rdma_destroy_id(id); | |
554 | return ERR_PTR(rc); | |
555 | } | |
556 | ||
557 | /* | |
558 | * Drain any cq, prior to teardown. | |
559 | */ | |
560 | static void | |
561 | rpcrdma_clean_cq(struct ib_cq *cq) | |
562 | { | |
563 | struct ib_wc wc; | |
564 | int count = 0; | |
565 | ||
566 | while (1 == ib_poll_cq(cq, 1, &wc)) | |
567 | ++count; | |
568 | ||
569 | if (count) | |
570 | dprintk("RPC: %s: flushed %d events (last 0x%x)\n", | |
571 | __func__, count, wc.opcode); | |
572 | } | |
573 | ||
574 | /* | |
575 | * Exported functions. | |
576 | */ | |
577 | ||
578 | /* | |
579 | * Open and initialize an Interface Adapter. | |
580 | * o initializes fields of struct rpcrdma_ia, including | |
581 | * interface and provider attributes and protection zone. | |
582 | */ | |
583 | int | |
584 | rpcrdma_ia_open(struct rpcrdma_xprt *xprt, struct sockaddr *addr, int memreg) | |
585 | { | |
bd7ed1d1 | 586 | int rc, mem_priv; |
c56c65fb | 587 | struct rpcrdma_ia *ia = &xprt->rx_ia; |
7bc7972c | 588 | struct ib_device_attr *devattr = &ia->ri_devattr; |
c56c65fb | 589 | |
c56c65fb TT |
590 | ia->ri_id = rpcrdma_create_id(xprt, ia, addr); |
591 | if (IS_ERR(ia->ri_id)) { | |
592 | rc = PTR_ERR(ia->ri_id); | |
593 | goto out1; | |
594 | } | |
595 | ||
596 | ia->ri_pd = ib_alloc_pd(ia->ri_id->device); | |
597 | if (IS_ERR(ia->ri_pd)) { | |
598 | rc = PTR_ERR(ia->ri_pd); | |
599 | dprintk("RPC: %s: ib_alloc_pd() failed %i\n", | |
600 | __func__, rc); | |
601 | goto out2; | |
602 | } | |
603 | ||
7bc7972c | 604 | rc = ib_query_device(ia->ri_id->device, devattr); |
bd7ed1d1 TT |
605 | if (rc) { |
606 | dprintk("RPC: %s: ib_query_device failed %d\n", | |
607 | __func__, rc); | |
5ae711a2 | 608 | goto out3; |
bd7ed1d1 TT |
609 | } |
610 | ||
7bc7972c | 611 | if (devattr->device_cap_flags & IB_DEVICE_LOCAL_DMA_LKEY) { |
bd7ed1d1 TT |
612 | ia->ri_have_dma_lkey = 1; |
613 | ia->ri_dma_lkey = ia->ri_id->device->local_dma_lkey; | |
614 | } | |
615 | ||
f10eafd3 | 616 | if (memreg == RPCRDMA_FRMR) { |
3197d309 | 617 | /* Requires both frmr reg and local dma lkey */ |
41f97028 | 618 | if (((devattr->device_cap_flags & |
3197d309 | 619 | (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) != |
41f97028 CL |
620 | (IB_DEVICE_MEM_MGT_EXTENSIONS|IB_DEVICE_LOCAL_DMA_LKEY)) || |
621 | (devattr->max_fast_reg_page_list_len == 0)) { | |
3197d309 | 622 | dprintk("RPC: %s: FRMR registration " |
f10eafd3 CL |
623 | "not supported by HCA\n", __func__); |
624 | memreg = RPCRDMA_MTHCAFMR; | |
0fc6c4e7 SW |
625 | } else { |
626 | /* Mind the ia limit on FRMR page list depth */ | |
627 | ia->ri_max_frmr_depth = min_t(unsigned int, | |
628 | RPCRDMA_MAX_DATA_SEGS, | |
7bc7972c | 629 | devattr->max_fast_reg_page_list_len); |
bd7ed1d1 | 630 | } |
f10eafd3 CL |
631 | } |
632 | if (memreg == RPCRDMA_MTHCAFMR) { | |
633 | if (!ia->ri_id->device->alloc_fmr) { | |
634 | dprintk("RPC: %s: MTHCAFMR registration " | |
635 | "not supported by HCA\n", __func__); | |
f10eafd3 | 636 | memreg = RPCRDMA_ALLPHYSICAL; |
f10eafd3 | 637 | } |
bd7ed1d1 TT |
638 | } |
639 | ||
c56c65fb TT |
640 | /* |
641 | * Optionally obtain an underlying physical identity mapping in | |
642 | * order to do a memory window-based bind. This base registration | |
643 | * is protected from remote access - that is enabled only by binding | |
644 | * for the specific bytes targeted during each RPC operation, and | |
645 | * revoked after the corresponding completion similar to a storage | |
646 | * adapter. | |
647 | */ | |
bd7ed1d1 | 648 | switch (memreg) { |
3197d309 | 649 | case RPCRDMA_FRMR: |
a0ce85f5 | 650 | ia->ri_ops = &rpcrdma_frwr_memreg_ops; |
bd7ed1d1 | 651 | break; |
bd7ed1d1 | 652 | case RPCRDMA_ALLPHYSICAL: |
a0ce85f5 | 653 | ia->ri_ops = &rpcrdma_physical_memreg_ops; |
bd7ed1d1 TT |
654 | mem_priv = IB_ACCESS_LOCAL_WRITE | |
655 | IB_ACCESS_REMOTE_WRITE | | |
656 | IB_ACCESS_REMOTE_READ; | |
657 | goto register_setup; | |
bd7ed1d1 | 658 | case RPCRDMA_MTHCAFMR: |
a0ce85f5 | 659 | ia->ri_ops = &rpcrdma_fmr_memreg_ops; |
bd7ed1d1 | 660 | if (ia->ri_have_dma_lkey) |
c56c65fb | 661 | break; |
bd7ed1d1 TT |
662 | mem_priv = IB_ACCESS_LOCAL_WRITE; |
663 | register_setup: | |
c56c65fb TT |
664 | ia->ri_bind_mem = ib_get_dma_mr(ia->ri_pd, mem_priv); |
665 | if (IS_ERR(ia->ri_bind_mem)) { | |
666 | printk(KERN_ALERT "%s: ib_get_dma_mr for " | |
0ac531c1 | 667 | "phys register failed with %lX\n", |
c56c65fb | 668 | __func__, PTR_ERR(ia->ri_bind_mem)); |
0ac531c1 | 669 | rc = -ENOMEM; |
5ae711a2 | 670 | goto out3; |
c56c65fb | 671 | } |
bd7ed1d1 TT |
672 | break; |
673 | default: | |
cdd9ade7 CL |
674 | printk(KERN_ERR "RPC: Unsupported memory " |
675 | "registration mode: %d\n", memreg); | |
676 | rc = -ENOMEM; | |
5ae711a2 | 677 | goto out3; |
c56c65fb | 678 | } |
a0ce85f5 CL |
679 | dprintk("RPC: %s: memory registration strategy is '%s'\n", |
680 | __func__, ia->ri_ops->ro_displayname); | |
c56c65fb TT |
681 | |
682 | /* Else will do memory reg/dereg for each chunk */ | |
683 | ia->ri_memreg_strategy = memreg; | |
684 | ||
73806c88 | 685 | rwlock_init(&ia->ri_qplock); |
c56c65fb | 686 | return 0; |
5ae711a2 CL |
687 | |
688 | out3: | |
689 | ib_dealloc_pd(ia->ri_pd); | |
690 | ia->ri_pd = NULL; | |
c56c65fb TT |
691 | out2: |
692 | rdma_destroy_id(ia->ri_id); | |
fee08caf | 693 | ia->ri_id = NULL; |
c56c65fb TT |
694 | out1: |
695 | return rc; | |
696 | } | |
697 | ||
698 | /* | |
699 | * Clean up/close an IA. | |
700 | * o if event handles and PD have been initialized, free them. | |
701 | * o close the IA | |
702 | */ | |
703 | void | |
704 | rpcrdma_ia_close(struct rpcrdma_ia *ia) | |
705 | { | |
706 | int rc; | |
707 | ||
708 | dprintk("RPC: %s: entering\n", __func__); | |
709 | if (ia->ri_bind_mem != NULL) { | |
710 | rc = ib_dereg_mr(ia->ri_bind_mem); | |
711 | dprintk("RPC: %s: ib_dereg_mr returned %i\n", | |
712 | __func__, rc); | |
713 | } | |
fee08caf TT |
714 | if (ia->ri_id != NULL && !IS_ERR(ia->ri_id)) { |
715 | if (ia->ri_id->qp) | |
716 | rdma_destroy_qp(ia->ri_id); | |
717 | rdma_destroy_id(ia->ri_id); | |
718 | ia->ri_id = NULL; | |
719 | } | |
c56c65fb TT |
720 | if (ia->ri_pd != NULL && !IS_ERR(ia->ri_pd)) { |
721 | rc = ib_dealloc_pd(ia->ri_pd); | |
722 | dprintk("RPC: %s: ib_dealloc_pd returned %i\n", | |
723 | __func__, rc); | |
724 | } | |
c56c65fb TT |
725 | } |
726 | ||
727 | /* | |
728 | * Create unconnected endpoint. | |
729 | */ | |
730 | int | |
731 | rpcrdma_ep_create(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia, | |
732 | struct rpcrdma_create_data_internal *cdata) | |
733 | { | |
7bc7972c | 734 | struct ib_device_attr *devattr = &ia->ri_devattr; |
fc664485 | 735 | struct ib_cq *sendcq, *recvcq; |
5d40a8a5 | 736 | int rc, err; |
c56c65fb | 737 | |
c56c65fb | 738 | /* check provider's send/recv wr limits */ |
7bc7972c CL |
739 | if (cdata->max_requests > devattr->max_qp_wr) |
740 | cdata->max_requests = devattr->max_qp_wr; | |
c56c65fb TT |
741 | |
742 | ep->rep_attr.event_handler = rpcrdma_qp_async_error_upcall; | |
743 | ep->rep_attr.qp_context = ep; | |
744 | /* send_cq and recv_cq initialized below */ | |
745 | ep->rep_attr.srq = NULL; | |
746 | ep->rep_attr.cap.max_send_wr = cdata->max_requests; | |
747 | switch (ia->ri_memreg_strategy) { | |
0fc6c4e7 SW |
748 | case RPCRDMA_FRMR: { |
749 | int depth = 7; | |
750 | ||
15cdc644 TT |
751 | /* Add room for frmr register and invalidate WRs. |
752 | * 1. FRMR reg WR for head | |
753 | * 2. FRMR invalidate WR for head | |
0fc6c4e7 SW |
754 | * 3. N FRMR reg WRs for pagelist |
755 | * 4. N FRMR invalidate WRs for pagelist | |
15cdc644 TT |
756 | * 5. FRMR reg WR for tail |
757 | * 6. FRMR invalidate WR for tail | |
758 | * 7. The RDMA_SEND WR | |
759 | */ | |
0fc6c4e7 SW |
760 | |
761 | /* Calculate N if the device max FRMR depth is smaller than | |
762 | * RPCRDMA_MAX_DATA_SEGS. | |
763 | */ | |
764 | if (ia->ri_max_frmr_depth < RPCRDMA_MAX_DATA_SEGS) { | |
765 | int delta = RPCRDMA_MAX_DATA_SEGS - | |
766 | ia->ri_max_frmr_depth; | |
767 | ||
768 | do { | |
769 | depth += 2; /* FRMR reg + invalidate */ | |
770 | delta -= ia->ri_max_frmr_depth; | |
771 | } while (delta > 0); | |
772 | ||
773 | } | |
774 | ep->rep_attr.cap.max_send_wr *= depth; | |
7bc7972c CL |
775 | if (ep->rep_attr.cap.max_send_wr > devattr->max_qp_wr) { |
776 | cdata->max_requests = devattr->max_qp_wr / depth; | |
15cdc644 TT |
777 | if (!cdata->max_requests) |
778 | return -EINVAL; | |
0fc6c4e7 SW |
779 | ep->rep_attr.cap.max_send_wr = cdata->max_requests * |
780 | depth; | |
15cdc644 | 781 | } |
3197d309 | 782 | break; |
0fc6c4e7 | 783 | } |
c56c65fb TT |
784 | default: |
785 | break; | |
786 | } | |
787 | ep->rep_attr.cap.max_recv_wr = cdata->max_requests; | |
788 | ep->rep_attr.cap.max_send_sge = (cdata->padding ? 4 : 2); | |
789 | ep->rep_attr.cap.max_recv_sge = 1; | |
790 | ep->rep_attr.cap.max_inline_data = 0; | |
791 | ep->rep_attr.sq_sig_type = IB_SIGNAL_REQ_WR; | |
792 | ep->rep_attr.qp_type = IB_QPT_RC; | |
793 | ep->rep_attr.port_num = ~0; | |
794 | ||
c05fbb5a CL |
795 | if (cdata->padding) { |
796 | ep->rep_padbuf = rpcrdma_alloc_regbuf(ia, cdata->padding, | |
797 | GFP_KERNEL); | |
798 | if (IS_ERR(ep->rep_padbuf)) | |
799 | return PTR_ERR(ep->rep_padbuf); | |
800 | } else | |
801 | ep->rep_padbuf = NULL; | |
802 | ||
c56c65fb TT |
803 | dprintk("RPC: %s: requested max: dtos: send %d recv %d; " |
804 | "iovs: send %d recv %d\n", | |
805 | __func__, | |
806 | ep->rep_attr.cap.max_send_wr, | |
807 | ep->rep_attr.cap.max_recv_wr, | |
808 | ep->rep_attr.cap.max_send_sge, | |
809 | ep->rep_attr.cap.max_recv_sge); | |
810 | ||
811 | /* set trigger for requesting send completion */ | |
fc664485 | 812 | ep->rep_cqinit = ep->rep_attr.cap.max_send_wr/2 - 1; |
e7104a2a CL |
813 | if (ep->rep_cqinit > RPCRDMA_MAX_UNSIGNALED_SENDS) |
814 | ep->rep_cqinit = RPCRDMA_MAX_UNSIGNALED_SENDS; | |
815 | else if (ep->rep_cqinit <= 2) | |
c56c65fb TT |
816 | ep->rep_cqinit = 0; |
817 | INIT_CQCOUNT(ep); | |
c56c65fb | 818 | init_waitqueue_head(&ep->rep_connect_wait); |
254f91e2 | 819 | INIT_DELAYED_WORK(&ep->rep_connect_worker, rpcrdma_connect_worker); |
c56c65fb | 820 | |
fc664485 | 821 | sendcq = ib_create_cq(ia->ri_id->device, rpcrdma_sendcq_upcall, |
1c00dd07 | 822 | rpcrdma_cq_async_error_upcall, ep, |
c56c65fb | 823 | ep->rep_attr.cap.max_send_wr + 1, 0); |
fc664485 CL |
824 | if (IS_ERR(sendcq)) { |
825 | rc = PTR_ERR(sendcq); | |
826 | dprintk("RPC: %s: failed to create send CQ: %i\n", | |
c56c65fb TT |
827 | __func__, rc); |
828 | goto out1; | |
829 | } | |
830 | ||
fc664485 | 831 | rc = ib_req_notify_cq(sendcq, IB_CQ_NEXT_COMP); |
c56c65fb TT |
832 | if (rc) { |
833 | dprintk("RPC: %s: ib_req_notify_cq failed: %i\n", | |
834 | __func__, rc); | |
835 | goto out2; | |
836 | } | |
837 | ||
fc664485 | 838 | recvcq = ib_create_cq(ia->ri_id->device, rpcrdma_recvcq_upcall, |
1c00dd07 | 839 | rpcrdma_cq_async_error_upcall, ep, |
fc664485 CL |
840 | ep->rep_attr.cap.max_recv_wr + 1, 0); |
841 | if (IS_ERR(recvcq)) { | |
842 | rc = PTR_ERR(recvcq); | |
843 | dprintk("RPC: %s: failed to create recv CQ: %i\n", | |
844 | __func__, rc); | |
845 | goto out2; | |
846 | } | |
847 | ||
848 | rc = ib_req_notify_cq(recvcq, IB_CQ_NEXT_COMP); | |
849 | if (rc) { | |
850 | dprintk("RPC: %s: ib_req_notify_cq failed: %i\n", | |
851 | __func__, rc); | |
852 | ib_destroy_cq(recvcq); | |
853 | goto out2; | |
854 | } | |
855 | ||
856 | ep->rep_attr.send_cq = sendcq; | |
857 | ep->rep_attr.recv_cq = recvcq; | |
c56c65fb TT |
858 | |
859 | /* Initialize cma parameters */ | |
860 | ||
861 | /* RPC/RDMA does not use private data */ | |
862 | ep->rep_remote_cma.private_data = NULL; | |
863 | ep->rep_remote_cma.private_data_len = 0; | |
864 | ||
865 | /* Client offers RDMA Read but does not initiate */ | |
b334eaab | 866 | ep->rep_remote_cma.initiator_depth = 0; |
7bc7972c | 867 | if (devattr->max_qp_rd_atom > 32) /* arbitrary but <= 255 */ |
b334eaab TT |
868 | ep->rep_remote_cma.responder_resources = 32; |
869 | else | |
7bc7972c CL |
870 | ep->rep_remote_cma.responder_resources = |
871 | devattr->max_qp_rd_atom; | |
c56c65fb TT |
872 | |
873 | ep->rep_remote_cma.retry_count = 7; | |
874 | ep->rep_remote_cma.flow_control = 0; | |
875 | ep->rep_remote_cma.rnr_retry_count = 0; | |
876 | ||
877 | return 0; | |
878 | ||
879 | out2: | |
fc664485 | 880 | err = ib_destroy_cq(sendcq); |
5d40a8a5 CL |
881 | if (err) |
882 | dprintk("RPC: %s: ib_destroy_cq returned %i\n", | |
883 | __func__, err); | |
c56c65fb | 884 | out1: |
c05fbb5a | 885 | rpcrdma_free_regbuf(ia, ep->rep_padbuf); |
c56c65fb TT |
886 | return rc; |
887 | } | |
888 | ||
889 | /* | |
890 | * rpcrdma_ep_destroy | |
891 | * | |
892 | * Disconnect and destroy endpoint. After this, the only | |
893 | * valid operations on the ep are to free it (if dynamically | |
894 | * allocated) or re-create it. | |
c56c65fb | 895 | */ |
7f1d5419 | 896 | void |
c56c65fb TT |
897 | rpcrdma_ep_destroy(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) |
898 | { | |
899 | int rc; | |
900 | ||
901 | dprintk("RPC: %s: entering, connected is %d\n", | |
902 | __func__, ep->rep_connected); | |
903 | ||
254f91e2 CL |
904 | cancel_delayed_work_sync(&ep->rep_connect_worker); |
905 | ||
c56c65fb | 906 | if (ia->ri_id->qp) { |
282191cb | 907 | rpcrdma_ep_disconnect(ep, ia); |
fee08caf TT |
908 | rdma_destroy_qp(ia->ri_id); |
909 | ia->ri_id->qp = NULL; | |
c56c65fb TT |
910 | } |
911 | ||
c05fbb5a | 912 | rpcrdma_free_regbuf(ia, ep->rep_padbuf); |
c56c65fb | 913 | |
fc664485 CL |
914 | rpcrdma_clean_cq(ep->rep_attr.recv_cq); |
915 | rc = ib_destroy_cq(ep->rep_attr.recv_cq); | |
916 | if (rc) | |
917 | dprintk("RPC: %s: ib_destroy_cq returned %i\n", | |
918 | __func__, rc); | |
919 | ||
920 | rpcrdma_clean_cq(ep->rep_attr.send_cq); | |
921 | rc = ib_destroy_cq(ep->rep_attr.send_cq); | |
c56c65fb TT |
922 | if (rc) |
923 | dprintk("RPC: %s: ib_destroy_cq returned %i\n", | |
924 | __func__, rc); | |
c56c65fb TT |
925 | } |
926 | ||
927 | /* | |
928 | * Connect unconnected endpoint. | |
929 | */ | |
930 | int | |
931 | rpcrdma_ep_connect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) | |
932 | { | |
73806c88 | 933 | struct rdma_cm_id *id, *old; |
c56c65fb TT |
934 | int rc = 0; |
935 | int retry_count = 0; | |
c56c65fb | 936 | |
c055551e | 937 | if (ep->rep_connected != 0) { |
c56c65fb TT |
938 | struct rpcrdma_xprt *xprt; |
939 | retry: | |
ec62f40d | 940 | dprintk("RPC: %s: reconnecting...\n", __func__); |
282191cb CL |
941 | |
942 | rpcrdma_ep_disconnect(ep, ia); | |
a7bc211a | 943 | rpcrdma_flush_cqs(ep); |
c56c65fb TT |
944 | |
945 | xprt = container_of(ia, struct rpcrdma_xprt, rx_ia); | |
31a701a9 CL |
946 | ia->ri_ops->ro_reset(xprt); |
947 | ||
c56c65fb TT |
948 | id = rpcrdma_create_id(xprt, ia, |
949 | (struct sockaddr *)&xprt->rx_data.addr); | |
950 | if (IS_ERR(id)) { | |
ec62f40d | 951 | rc = -EHOSTUNREACH; |
c56c65fb TT |
952 | goto out; |
953 | } | |
954 | /* TEMP TEMP TEMP - fail if new device: | |
955 | * Deregister/remarshal *all* requests! | |
956 | * Close and recreate adapter, pd, etc! | |
957 | * Re-determine all attributes still sane! | |
958 | * More stuff I haven't thought of! | |
959 | * Rrrgh! | |
960 | */ | |
961 | if (ia->ri_id->device != id->device) { | |
962 | printk("RPC: %s: can't reconnect on " | |
963 | "different device!\n", __func__); | |
964 | rdma_destroy_id(id); | |
ec62f40d | 965 | rc = -ENETUNREACH; |
c56c65fb TT |
966 | goto out; |
967 | } | |
968 | /* END TEMP */ | |
ec62f40d CL |
969 | rc = rdma_create_qp(id, ia->ri_pd, &ep->rep_attr); |
970 | if (rc) { | |
971 | dprintk("RPC: %s: rdma_create_qp failed %i\n", | |
972 | __func__, rc); | |
973 | rdma_destroy_id(id); | |
974 | rc = -ENETUNREACH; | |
975 | goto out; | |
976 | } | |
73806c88 CL |
977 | |
978 | write_lock(&ia->ri_qplock); | |
979 | old = ia->ri_id; | |
c56c65fb | 980 | ia->ri_id = id; |
73806c88 CL |
981 | write_unlock(&ia->ri_qplock); |
982 | ||
983 | rdma_destroy_qp(old); | |
984 | rdma_destroy_id(old); | |
ec62f40d CL |
985 | } else { |
986 | dprintk("RPC: %s: connecting...\n", __func__); | |
987 | rc = rdma_create_qp(ia->ri_id, ia->ri_pd, &ep->rep_attr); | |
988 | if (rc) { | |
989 | dprintk("RPC: %s: rdma_create_qp failed %i\n", | |
990 | __func__, rc); | |
991 | /* do not update ep->rep_connected */ | |
992 | return -ENETUNREACH; | |
993 | } | |
c56c65fb TT |
994 | } |
995 | ||
c56c65fb TT |
996 | ep->rep_connected = 0; |
997 | ||
998 | rc = rdma_connect(ia->ri_id, &ep->rep_remote_cma); | |
999 | if (rc) { | |
1000 | dprintk("RPC: %s: rdma_connect() failed with %i\n", | |
1001 | __func__, rc); | |
1002 | goto out; | |
1003 | } | |
1004 | ||
c56c65fb TT |
1005 | wait_event_interruptible(ep->rep_connect_wait, ep->rep_connected != 0); |
1006 | ||
1007 | /* | |
1008 | * Check state. A non-peer reject indicates no listener | |
1009 | * (ECONNREFUSED), which may be a transient state. All | |
1010 | * others indicate a transport condition which has already | |
1011 | * undergone a best-effort. | |
1012 | */ | |
f64f9e71 JP |
1013 | if (ep->rep_connected == -ECONNREFUSED && |
1014 | ++retry_count <= RDMA_CONNECT_RETRY_MAX) { | |
c56c65fb TT |
1015 | dprintk("RPC: %s: non-peer_reject, retry\n", __func__); |
1016 | goto retry; | |
1017 | } | |
1018 | if (ep->rep_connected <= 0) { | |
1019 | /* Sometimes, the only way to reliably connect to remote | |
1020 | * CMs is to use same nonzero values for ORD and IRD. */ | |
b334eaab TT |
1021 | if (retry_count++ <= RDMA_CONNECT_RETRY_MAX + 1 && |
1022 | (ep->rep_remote_cma.responder_resources == 0 || | |
1023 | ep->rep_remote_cma.initiator_depth != | |
1024 | ep->rep_remote_cma.responder_resources)) { | |
1025 | if (ep->rep_remote_cma.responder_resources == 0) | |
1026 | ep->rep_remote_cma.responder_resources = 1; | |
1027 | ep->rep_remote_cma.initiator_depth = | |
1028 | ep->rep_remote_cma.responder_resources; | |
c56c65fb | 1029 | goto retry; |
b334eaab | 1030 | } |
c56c65fb TT |
1031 | rc = ep->rep_connected; |
1032 | } else { | |
1033 | dprintk("RPC: %s: connected\n", __func__); | |
1034 | } | |
1035 | ||
1036 | out: | |
1037 | if (rc) | |
1038 | ep->rep_connected = rc; | |
1039 | return rc; | |
1040 | } | |
1041 | ||
1042 | /* | |
1043 | * rpcrdma_ep_disconnect | |
1044 | * | |
1045 | * This is separate from destroy to facilitate the ability | |
1046 | * to reconnect without recreating the endpoint. | |
1047 | * | |
1048 | * This call is not reentrant, and must not be made in parallel | |
1049 | * on the same endpoint. | |
1050 | */ | |
282191cb | 1051 | void |
c56c65fb TT |
1052 | rpcrdma_ep_disconnect(struct rpcrdma_ep *ep, struct rpcrdma_ia *ia) |
1053 | { | |
1054 | int rc; | |
1055 | ||
a7bc211a | 1056 | rpcrdma_flush_cqs(ep); |
c56c65fb TT |
1057 | rc = rdma_disconnect(ia->ri_id); |
1058 | if (!rc) { | |
1059 | /* returns without wait if not connected */ | |
1060 | wait_event_interruptible(ep->rep_connect_wait, | |
1061 | ep->rep_connected != 1); | |
1062 | dprintk("RPC: %s: after wait, %sconnected\n", __func__, | |
1063 | (ep->rep_connected == 1) ? "still " : "dis"); | |
1064 | } else { | |
1065 | dprintk("RPC: %s: rdma_disconnect %i\n", __func__, rc); | |
1066 | ep->rep_connected = rc; | |
1067 | } | |
c56c65fb TT |
1068 | } |
1069 | ||
1392402c CL |
1070 | static struct rpcrdma_req * |
1071 | rpcrdma_create_req(struct rpcrdma_xprt *r_xprt) | |
1072 | { | |
1392402c | 1073 | struct rpcrdma_req *req; |
1392402c | 1074 | |
85275c87 | 1075 | req = kzalloc(sizeof(*req), GFP_KERNEL); |
1392402c | 1076 | if (req == NULL) |
85275c87 | 1077 | return ERR_PTR(-ENOMEM); |
1392402c | 1078 | |
1392402c CL |
1079 | req->rl_buffer = &r_xprt->rx_buf; |
1080 | return req; | |
1392402c CL |
1081 | } |
1082 | ||
1083 | static struct rpcrdma_rep * | |
1084 | rpcrdma_create_rep(struct rpcrdma_xprt *r_xprt) | |
1085 | { | |
1086 | struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data; | |
1392402c CL |
1087 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; |
1088 | struct rpcrdma_rep *rep; | |
1089 | int rc; | |
1090 | ||
1091 | rc = -ENOMEM; | |
6b1184cd | 1092 | rep = kzalloc(sizeof(*rep), GFP_KERNEL); |
1392402c CL |
1093 | if (rep == NULL) |
1094 | goto out; | |
1392402c | 1095 | |
6b1184cd CL |
1096 | rep->rr_rdmabuf = rpcrdma_alloc_regbuf(ia, cdata->inline_rsize, |
1097 | GFP_KERNEL); | |
1098 | if (IS_ERR(rep->rr_rdmabuf)) { | |
1099 | rc = PTR_ERR(rep->rr_rdmabuf); | |
1392402c | 1100 | goto out_free; |
6b1184cd | 1101 | } |
1392402c CL |
1102 | |
1103 | rep->rr_buffer = &r_xprt->rx_buf; | |
1104 | return rep; | |
1105 | ||
1106 | out_free: | |
1107 | kfree(rep); | |
1108 | out: | |
1109 | return ERR_PTR(rc); | |
1110 | } | |
1111 | ||
c56c65fb | 1112 | int |
ac920d04 | 1113 | rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt) |
c56c65fb | 1114 | { |
ac920d04 CL |
1115 | struct rpcrdma_buffer *buf = &r_xprt->rx_buf; |
1116 | struct rpcrdma_ia *ia = &r_xprt->rx_ia; | |
1117 | struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data; | |
c56c65fb | 1118 | char *p; |
1392402c | 1119 | size_t len; |
c56c65fb TT |
1120 | int i, rc; |
1121 | ||
1122 | buf->rb_max_requests = cdata->max_requests; | |
1123 | spin_lock_init(&buf->rb_lock); | |
c56c65fb TT |
1124 | |
1125 | /* Need to allocate: | |
1126 | * 1. arrays for send and recv pointers | |
1127 | * 2. arrays of struct rpcrdma_req to fill in pointers | |
1128 | * 3. array of struct rpcrdma_rep for replies | |
c56c65fb TT |
1129 | * Send/recv buffers in req/rep need to be registered |
1130 | */ | |
c56c65fb TT |
1131 | len = buf->rb_max_requests * |
1132 | (sizeof(struct rpcrdma_req *) + sizeof(struct rpcrdma_rep *)); | |
c56c65fb | 1133 | |
c56c65fb TT |
1134 | p = kzalloc(len, GFP_KERNEL); |
1135 | if (p == NULL) { | |
1136 | dprintk("RPC: %s: req_t/rep_t/pad kzalloc(%zd) failed\n", | |
1137 | __func__, len); | |
1138 | rc = -ENOMEM; | |
1139 | goto out; | |
1140 | } | |
1141 | buf->rb_pool = p; /* for freeing it later */ | |
1142 | ||
1143 | buf->rb_send_bufs = (struct rpcrdma_req **) p; | |
1144 | p = (char *) &buf->rb_send_bufs[buf->rb_max_requests]; | |
1145 | buf->rb_recv_bufs = (struct rpcrdma_rep **) p; | |
1146 | p = (char *) &buf->rb_recv_bufs[buf->rb_max_requests]; | |
1147 | ||
91e70e70 CL |
1148 | rc = ia->ri_ops->ro_init(r_xprt); |
1149 | if (rc) | |
1150 | goto out; | |
c56c65fb | 1151 | |
c56c65fb TT |
1152 | for (i = 0; i < buf->rb_max_requests; i++) { |
1153 | struct rpcrdma_req *req; | |
1154 | struct rpcrdma_rep *rep; | |
1155 | ||
1392402c CL |
1156 | req = rpcrdma_create_req(r_xprt); |
1157 | if (IS_ERR(req)) { | |
c56c65fb TT |
1158 | dprintk("RPC: %s: request buffer %d alloc" |
1159 | " failed\n", __func__, i); | |
1392402c | 1160 | rc = PTR_ERR(req); |
c56c65fb TT |
1161 | goto out; |
1162 | } | |
c56c65fb | 1163 | buf->rb_send_bufs[i] = req; |
c56c65fb | 1164 | |
1392402c CL |
1165 | rep = rpcrdma_create_rep(r_xprt); |
1166 | if (IS_ERR(rep)) { | |
c56c65fb TT |
1167 | dprintk("RPC: %s: reply buffer %d alloc failed\n", |
1168 | __func__, i); | |
1392402c | 1169 | rc = PTR_ERR(rep); |
c56c65fb TT |
1170 | goto out; |
1171 | } | |
c56c65fb | 1172 | buf->rb_recv_bufs[i] = rep; |
c56c65fb | 1173 | } |
1392402c | 1174 | |
c56c65fb TT |
1175 | return 0; |
1176 | out: | |
1177 | rpcrdma_buffer_destroy(buf); | |
1178 | return rc; | |
1179 | } | |
1180 | ||
1392402c CL |
1181 | static void |
1182 | rpcrdma_destroy_rep(struct rpcrdma_ia *ia, struct rpcrdma_rep *rep) | |
1183 | { | |
1184 | if (!rep) | |
1185 | return; | |
1186 | ||
6b1184cd | 1187 | rpcrdma_free_regbuf(ia, rep->rr_rdmabuf); |
1392402c CL |
1188 | kfree(rep); |
1189 | } | |
1190 | ||
1191 | static void | |
1192 | rpcrdma_destroy_req(struct rpcrdma_ia *ia, struct rpcrdma_req *req) | |
1193 | { | |
1194 | if (!req) | |
1195 | return; | |
1196 | ||
0ca77dc3 | 1197 | rpcrdma_free_regbuf(ia, req->rl_sendbuf); |
85275c87 | 1198 | rpcrdma_free_regbuf(ia, req->rl_rdmabuf); |
1392402c CL |
1199 | kfree(req); |
1200 | } | |
1201 | ||
c56c65fb TT |
1202 | void |
1203 | rpcrdma_buffer_destroy(struct rpcrdma_buffer *buf) | |
1204 | { | |
c56c65fb | 1205 | struct rpcrdma_ia *ia = rdmab_to_ia(buf); |
2e84522c | 1206 | int i; |
c56c65fb TT |
1207 | |
1208 | /* clean up in reverse order from create | |
1209 | * 1. recv mr memory (mr free, then kfree) | |
c56c65fb | 1210 | * 2. send mr memory (mr free, then kfree) |
2e84522c | 1211 | * 3. MWs |
c56c65fb TT |
1212 | */ |
1213 | dprintk("RPC: %s: entering\n", __func__); | |
1214 | ||
1215 | for (i = 0; i < buf->rb_max_requests; i++) { | |
1392402c CL |
1216 | if (buf->rb_recv_bufs) |
1217 | rpcrdma_destroy_rep(ia, buf->rb_recv_bufs[i]); | |
1218 | if (buf->rb_send_bufs) | |
1219 | rpcrdma_destroy_req(ia, buf->rb_send_bufs[i]); | |
c56c65fb TT |
1220 | } |
1221 | ||
4561f347 | 1222 | ia->ri_ops->ro_destroy(buf); |
4034ba04 | 1223 | |
c56c65fb TT |
1224 | kfree(buf->rb_pool); |
1225 | } | |
1226 | ||
c2922c02 CL |
1227 | /* "*mw" can be NULL when rpcrdma_buffer_get_mrs() fails, leaving |
1228 | * some req segments uninitialized. | |
1229 | */ | |
1230 | static void | |
1231 | rpcrdma_buffer_put_mr(struct rpcrdma_mw **mw, struct rpcrdma_buffer *buf) | |
1232 | { | |
1233 | if (*mw) { | |
1234 | list_add_tail(&(*mw)->mw_list, &buf->rb_mws); | |
1235 | *mw = NULL; | |
1236 | } | |
1237 | } | |
1238 | ||
1239 | /* Cycle mw's back in reverse order, and "spin" them. | |
1240 | * This delays and scrambles reuse as much as possible. | |
1241 | */ | |
1242 | static void | |
1243 | rpcrdma_buffer_put_mrs(struct rpcrdma_req *req, struct rpcrdma_buffer *buf) | |
1244 | { | |
1245 | struct rpcrdma_mr_seg *seg = req->rl_segments; | |
1246 | struct rpcrdma_mr_seg *seg1 = seg; | |
1247 | int i; | |
1248 | ||
1249 | for (i = 1, seg++; i < RPCRDMA_MAX_SEGS; seg++, i++) | |
3eb35810 CL |
1250 | rpcrdma_buffer_put_mr(&seg->rl_mw, buf); |
1251 | rpcrdma_buffer_put_mr(&seg1->rl_mw, buf); | |
c2922c02 CL |
1252 | } |
1253 | ||
1254 | static void | |
1255 | rpcrdma_buffer_put_sendbuf(struct rpcrdma_req *req, struct rpcrdma_buffer *buf) | |
1256 | { | |
1257 | buf->rb_send_bufs[--buf->rb_send_index] = req; | |
1258 | req->rl_niovs = 0; | |
1259 | if (req->rl_reply) { | |
1260 | buf->rb_recv_bufs[--buf->rb_recv_index] = req->rl_reply; | |
1261 | req->rl_reply->rr_func = NULL; | |
1262 | req->rl_reply = NULL; | |
1263 | } | |
1264 | } | |
1265 | ||
6814baea | 1266 | /* rpcrdma_unmap_one() was already done during deregistration. |
ddb6bebc CL |
1267 | * Redo only the ib_post_send(). |
1268 | */ | |
1269 | static void | |
1270 | rpcrdma_retry_local_inv(struct rpcrdma_mw *r, struct rpcrdma_ia *ia) | |
1271 | { | |
1272 | struct rpcrdma_xprt *r_xprt = | |
1273 | container_of(ia, struct rpcrdma_xprt, rx_ia); | |
1274 | struct ib_send_wr invalidate_wr, *bad_wr; | |
1275 | int rc; | |
1276 | ||
1277 | dprintk("RPC: %s: FRMR %p is stale\n", __func__, r); | |
1278 | ||
1279 | /* When this FRMR is re-inserted into rb_mws, it is no longer stale */ | |
dab7e3b8 | 1280 | r->r.frmr.fr_state = FRMR_IS_INVALID; |
ddb6bebc CL |
1281 | |
1282 | memset(&invalidate_wr, 0, sizeof(invalidate_wr)); | |
1283 | invalidate_wr.wr_id = (unsigned long)(void *)r; | |
1284 | invalidate_wr.opcode = IB_WR_LOCAL_INV; | |
ddb6bebc CL |
1285 | invalidate_wr.ex.invalidate_rkey = r->r.frmr.fr_mr->rkey; |
1286 | DECR_CQCOUNT(&r_xprt->rx_ep); | |
1287 | ||
1288 | dprintk("RPC: %s: frmr %p invalidating rkey %08x\n", | |
1289 | __func__, r, r->r.frmr.fr_mr->rkey); | |
1290 | ||
1291 | read_lock(&ia->ri_qplock); | |
1292 | rc = ib_post_send(ia->ri_id->qp, &invalidate_wr, &bad_wr); | |
1293 | read_unlock(&ia->ri_qplock); | |
1294 | if (rc) { | |
1295 | /* Force rpcrdma_buffer_get() to retry */ | |
1296 | r->r.frmr.fr_state = FRMR_IS_STALE; | |
1297 | dprintk("RPC: %s: ib_post_send failed, %i\n", | |
1298 | __func__, rc); | |
1299 | } | |
1300 | } | |
1301 | ||
1302 | static void | |
1303 | rpcrdma_retry_flushed_linv(struct list_head *stale, | |
1304 | struct rpcrdma_buffer *buf) | |
1305 | { | |
1306 | struct rpcrdma_ia *ia = rdmab_to_ia(buf); | |
1307 | struct list_head *pos; | |
1308 | struct rpcrdma_mw *r; | |
1309 | unsigned long flags; | |
1310 | ||
1311 | list_for_each(pos, stale) { | |
1312 | r = list_entry(pos, struct rpcrdma_mw, mw_list); | |
1313 | rpcrdma_retry_local_inv(r, ia); | |
1314 | } | |
1315 | ||
1316 | spin_lock_irqsave(&buf->rb_lock, flags); | |
1317 | list_splice_tail(stale, &buf->rb_mws); | |
1318 | spin_unlock_irqrestore(&buf->rb_lock, flags); | |
1319 | } | |
1320 | ||
1321 | static struct rpcrdma_req * | |
1322 | rpcrdma_buffer_get_frmrs(struct rpcrdma_req *req, struct rpcrdma_buffer *buf, | |
1323 | struct list_head *stale) | |
1324 | { | |
1325 | struct rpcrdma_mw *r; | |
1326 | int i; | |
1327 | ||
1328 | i = RPCRDMA_MAX_SEGS - 1; | |
1329 | while (!list_empty(&buf->rb_mws)) { | |
1330 | r = list_entry(buf->rb_mws.next, | |
1331 | struct rpcrdma_mw, mw_list); | |
1332 | list_del(&r->mw_list); | |
1333 | if (r->r.frmr.fr_state == FRMR_IS_STALE) { | |
1334 | list_add(&r->mw_list, stale); | |
1335 | continue; | |
1336 | } | |
3eb35810 | 1337 | req->rl_segments[i].rl_mw = r; |
ddb6bebc CL |
1338 | if (unlikely(i-- == 0)) |
1339 | return req; /* Success */ | |
1340 | } | |
1341 | ||
1342 | /* Not enough entries on rb_mws for this req */ | |
1343 | rpcrdma_buffer_put_sendbuf(req, buf); | |
1344 | rpcrdma_buffer_put_mrs(req, buf); | |
1345 | return NULL; | |
1346 | } | |
1347 | ||
c2922c02 | 1348 | static struct rpcrdma_req * |
ddb6bebc | 1349 | rpcrdma_buffer_get_fmrs(struct rpcrdma_req *req, struct rpcrdma_buffer *buf) |
c2922c02 CL |
1350 | { |
1351 | struct rpcrdma_mw *r; | |
1352 | int i; | |
1353 | ||
1354 | i = RPCRDMA_MAX_SEGS - 1; | |
1355 | while (!list_empty(&buf->rb_mws)) { | |
1356 | r = list_entry(buf->rb_mws.next, | |
1357 | struct rpcrdma_mw, mw_list); | |
1358 | list_del(&r->mw_list); | |
3eb35810 | 1359 | req->rl_segments[i].rl_mw = r; |
c2922c02 CL |
1360 | if (unlikely(i-- == 0)) |
1361 | return req; /* Success */ | |
1362 | } | |
1363 | ||
1364 | /* Not enough entries on rb_mws for this req */ | |
1365 | rpcrdma_buffer_put_sendbuf(req, buf); | |
1366 | rpcrdma_buffer_put_mrs(req, buf); | |
1367 | return NULL; | |
1368 | } | |
1369 | ||
c56c65fb TT |
1370 | /* |
1371 | * Get a set of request/reply buffers. | |
1372 | * | |
1373 | * Reply buffer (if needed) is attached to send buffer upon return. | |
1374 | * Rule: | |
1375 | * rb_send_index and rb_recv_index MUST always be pointing to the | |
1376 | * *next* available buffer (non-NULL). They are incremented after | |
1377 | * removing buffers, and decremented *before* returning them. | |
1378 | */ | |
1379 | struct rpcrdma_req * | |
1380 | rpcrdma_buffer_get(struct rpcrdma_buffer *buffers) | |
1381 | { | |
c2922c02 | 1382 | struct rpcrdma_ia *ia = rdmab_to_ia(buffers); |
ddb6bebc | 1383 | struct list_head stale; |
c56c65fb TT |
1384 | struct rpcrdma_req *req; |
1385 | unsigned long flags; | |
1386 | ||
1387 | spin_lock_irqsave(&buffers->rb_lock, flags); | |
1388 | if (buffers->rb_send_index == buffers->rb_max_requests) { | |
1389 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1390 | dprintk("RPC: %s: out of request buffers\n", __func__); | |
1391 | return ((struct rpcrdma_req *)NULL); | |
1392 | } | |
1393 | ||
1394 | req = buffers->rb_send_bufs[buffers->rb_send_index]; | |
1395 | if (buffers->rb_send_index < buffers->rb_recv_index) { | |
1396 | dprintk("RPC: %s: %d extra receives outstanding (ok)\n", | |
1397 | __func__, | |
1398 | buffers->rb_recv_index - buffers->rb_send_index); | |
1399 | req->rl_reply = NULL; | |
1400 | } else { | |
1401 | req->rl_reply = buffers->rb_recv_bufs[buffers->rb_recv_index]; | |
1402 | buffers->rb_recv_bufs[buffers->rb_recv_index++] = NULL; | |
1403 | } | |
1404 | buffers->rb_send_bufs[buffers->rb_send_index++] = NULL; | |
ddb6bebc CL |
1405 | |
1406 | INIT_LIST_HEAD(&stale); | |
c2922c02 CL |
1407 | switch (ia->ri_memreg_strategy) { |
1408 | case RPCRDMA_FRMR: | |
ddb6bebc CL |
1409 | req = rpcrdma_buffer_get_frmrs(req, buffers, &stale); |
1410 | break; | |
c2922c02 | 1411 | case RPCRDMA_MTHCAFMR: |
ddb6bebc | 1412 | req = rpcrdma_buffer_get_fmrs(req, buffers); |
c2922c02 CL |
1413 | break; |
1414 | default: | |
1415 | break; | |
c56c65fb TT |
1416 | } |
1417 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
ddb6bebc CL |
1418 | if (!list_empty(&stale)) |
1419 | rpcrdma_retry_flushed_linv(&stale, buffers); | |
c56c65fb TT |
1420 | return req; |
1421 | } | |
1422 | ||
1423 | /* | |
1424 | * Put request/reply buffers back into pool. | |
1425 | * Pre-decrement counter/array index. | |
1426 | */ | |
1427 | void | |
1428 | rpcrdma_buffer_put(struct rpcrdma_req *req) | |
1429 | { | |
1430 | struct rpcrdma_buffer *buffers = req->rl_buffer; | |
1431 | struct rpcrdma_ia *ia = rdmab_to_ia(buffers); | |
c56c65fb TT |
1432 | unsigned long flags; |
1433 | ||
c56c65fb | 1434 | spin_lock_irqsave(&buffers->rb_lock, flags); |
c2922c02 | 1435 | rpcrdma_buffer_put_sendbuf(req, buffers); |
c56c65fb | 1436 | switch (ia->ri_memreg_strategy) { |
3197d309 | 1437 | case RPCRDMA_FRMR: |
c56c65fb | 1438 | case RPCRDMA_MTHCAFMR: |
c2922c02 | 1439 | rpcrdma_buffer_put_mrs(req, buffers); |
c56c65fb TT |
1440 | break; |
1441 | default: | |
1442 | break; | |
1443 | } | |
1444 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1445 | } | |
1446 | ||
1447 | /* | |
1448 | * Recover reply buffers from pool. | |
1449 | * This happens when recovering from error conditions. | |
1450 | * Post-increment counter/array index. | |
1451 | */ | |
1452 | void | |
1453 | rpcrdma_recv_buffer_get(struct rpcrdma_req *req) | |
1454 | { | |
1455 | struct rpcrdma_buffer *buffers = req->rl_buffer; | |
1456 | unsigned long flags; | |
1457 | ||
c56c65fb TT |
1458 | spin_lock_irqsave(&buffers->rb_lock, flags); |
1459 | if (buffers->rb_recv_index < buffers->rb_max_requests) { | |
1460 | req->rl_reply = buffers->rb_recv_bufs[buffers->rb_recv_index]; | |
1461 | buffers->rb_recv_bufs[buffers->rb_recv_index++] = NULL; | |
1462 | } | |
1463 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1464 | } | |
1465 | ||
1466 | /* | |
1467 | * Put reply buffers back into pool when not attached to | |
b45ccfd2 | 1468 | * request. This happens in error conditions. |
c56c65fb TT |
1469 | */ |
1470 | void | |
1471 | rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep) | |
1472 | { | |
1473 | struct rpcrdma_buffer *buffers = rep->rr_buffer; | |
1474 | unsigned long flags; | |
1475 | ||
1476 | rep->rr_func = NULL; | |
1477 | spin_lock_irqsave(&buffers->rb_lock, flags); | |
1478 | buffers->rb_recv_bufs[--buffers->rb_recv_index] = rep; | |
1479 | spin_unlock_irqrestore(&buffers->rb_lock, flags); | |
1480 | } | |
1481 | ||
1482 | /* | |
1483 | * Wrappers for internal-use kmalloc memory registration, used by buffer code. | |
1484 | */ | |
1485 | ||
df515ca7 | 1486 | static int |
c56c65fb TT |
1487 | rpcrdma_register_internal(struct rpcrdma_ia *ia, void *va, int len, |
1488 | struct ib_mr **mrp, struct ib_sge *iov) | |
1489 | { | |
1490 | struct ib_phys_buf ipb; | |
1491 | struct ib_mr *mr; | |
1492 | int rc; | |
1493 | ||
1494 | /* | |
1495 | * All memory passed here was kmalloc'ed, therefore phys-contiguous. | |
1496 | */ | |
1497 | iov->addr = ib_dma_map_single(ia->ri_id->device, | |
1498 | va, len, DMA_BIDIRECTIONAL); | |
bf858ab0 YB |
1499 | if (ib_dma_mapping_error(ia->ri_id->device, iov->addr)) |
1500 | return -ENOMEM; | |
1501 | ||
c56c65fb TT |
1502 | iov->length = len; |
1503 | ||
bd7ed1d1 TT |
1504 | if (ia->ri_have_dma_lkey) { |
1505 | *mrp = NULL; | |
1506 | iov->lkey = ia->ri_dma_lkey; | |
1507 | return 0; | |
1508 | } else if (ia->ri_bind_mem != NULL) { | |
c56c65fb TT |
1509 | *mrp = NULL; |
1510 | iov->lkey = ia->ri_bind_mem->lkey; | |
1511 | return 0; | |
1512 | } | |
1513 | ||
1514 | ipb.addr = iov->addr; | |
1515 | ipb.size = iov->length; | |
1516 | mr = ib_reg_phys_mr(ia->ri_pd, &ipb, 1, | |
1517 | IB_ACCESS_LOCAL_WRITE, &iov->addr); | |
1518 | ||
1519 | dprintk("RPC: %s: phys convert: 0x%llx " | |
1520 | "registered 0x%llx length %d\n", | |
a56daeb7 AM |
1521 | __func__, (unsigned long long)ipb.addr, |
1522 | (unsigned long long)iov->addr, len); | |
c56c65fb TT |
1523 | |
1524 | if (IS_ERR(mr)) { | |
1525 | *mrp = NULL; | |
1526 | rc = PTR_ERR(mr); | |
1527 | dprintk("RPC: %s: failed with %i\n", __func__, rc); | |
1528 | } else { | |
1529 | *mrp = mr; | |
1530 | iov->lkey = mr->lkey; | |
1531 | rc = 0; | |
1532 | } | |
1533 | ||
1534 | return rc; | |
1535 | } | |
1536 | ||
df515ca7 | 1537 | static int |
c56c65fb TT |
1538 | rpcrdma_deregister_internal(struct rpcrdma_ia *ia, |
1539 | struct ib_mr *mr, struct ib_sge *iov) | |
1540 | { | |
1541 | int rc; | |
1542 | ||
1543 | ib_dma_unmap_single(ia->ri_id->device, | |
1544 | iov->addr, iov->length, DMA_BIDIRECTIONAL); | |
1545 | ||
1546 | if (NULL == mr) | |
1547 | return 0; | |
1548 | ||
1549 | rc = ib_dereg_mr(mr); | |
1550 | if (rc) | |
1551 | dprintk("RPC: %s: ib_dereg_mr failed %i\n", __func__, rc); | |
1552 | return rc; | |
1553 | } | |
1554 | ||
9128c3e7 CL |
1555 | /** |
1556 | * rpcrdma_alloc_regbuf - kmalloc and register memory for SEND/RECV buffers | |
1557 | * @ia: controlling rpcrdma_ia | |
1558 | * @size: size of buffer to be allocated, in bytes | |
1559 | * @flags: GFP flags | |
1560 | * | |
1561 | * Returns pointer to private header of an area of internally | |
1562 | * registered memory, or an ERR_PTR. The registered buffer follows | |
1563 | * the end of the private header. | |
1564 | * | |
1565 | * xprtrdma uses a regbuf for posting an outgoing RDMA SEND, or for | |
1566 | * receiving the payload of RDMA RECV operations. regbufs are not | |
1567 | * used for RDMA READ/WRITE operations, thus are registered only for | |
1568 | * LOCAL access. | |
1569 | */ | |
1570 | struct rpcrdma_regbuf * | |
1571 | rpcrdma_alloc_regbuf(struct rpcrdma_ia *ia, size_t size, gfp_t flags) | |
1572 | { | |
1573 | struct rpcrdma_regbuf *rb; | |
1574 | int rc; | |
1575 | ||
1576 | rc = -ENOMEM; | |
1577 | rb = kmalloc(sizeof(*rb) + size, flags); | |
1578 | if (rb == NULL) | |
1579 | goto out; | |
1580 | ||
1581 | rb->rg_size = size; | |
1582 | rb->rg_owner = NULL; | |
1583 | rc = rpcrdma_register_internal(ia, rb->rg_base, size, | |
1584 | &rb->rg_mr, &rb->rg_iov); | |
1585 | if (rc) | |
1586 | goto out_free; | |
1587 | ||
1588 | return rb; | |
1589 | ||
1590 | out_free: | |
1591 | kfree(rb); | |
1592 | out: | |
1593 | return ERR_PTR(rc); | |
1594 | } | |
1595 | ||
1596 | /** | |
1597 | * rpcrdma_free_regbuf - deregister and free registered buffer | |
1598 | * @ia: controlling rpcrdma_ia | |
1599 | * @rb: regbuf to be deregistered and freed | |
1600 | */ | |
1601 | void | |
1602 | rpcrdma_free_regbuf(struct rpcrdma_ia *ia, struct rpcrdma_regbuf *rb) | |
1603 | { | |
1604 | if (rb) { | |
1605 | rpcrdma_deregister_internal(ia, rb->rg_mr, &rb->rg_iov); | |
1606 | kfree(rb); | |
1607 | } | |
1608 | } | |
1609 | ||
c56c65fb TT |
1610 | /* |
1611 | * Wrappers for chunk registration, shared by read/write chunk code. | |
1612 | */ | |
1613 | ||
9c1b4d77 CL |
1614 | void |
1615 | rpcrdma_map_one(struct rpcrdma_ia *ia, struct rpcrdma_mr_seg *seg, bool writing) | |
c56c65fb TT |
1616 | { |
1617 | seg->mr_dir = writing ? DMA_FROM_DEVICE : DMA_TO_DEVICE; | |
1618 | seg->mr_dmalen = seg->mr_len; | |
1619 | if (seg->mr_page) | |
1620 | seg->mr_dma = ib_dma_map_page(ia->ri_id->device, | |
1621 | seg->mr_page, offset_in_page(seg->mr_offset), | |
1622 | seg->mr_dmalen, seg->mr_dir); | |
1623 | else | |
1624 | seg->mr_dma = ib_dma_map_single(ia->ri_id->device, | |
1625 | seg->mr_offset, | |
1626 | seg->mr_dmalen, seg->mr_dir); | |
5c635e09 TT |
1627 | if (ib_dma_mapping_error(ia->ri_id->device, seg->mr_dma)) { |
1628 | dprintk("RPC: %s: mr_dma %llx mr_offset %p mr_dma_len %zu\n", | |
1629 | __func__, | |
986d4abb RD |
1630 | (unsigned long long)seg->mr_dma, |
1631 | seg->mr_offset, seg->mr_dmalen); | |
5c635e09 | 1632 | } |
c56c65fb TT |
1633 | } |
1634 | ||
9c1b4d77 | 1635 | void |
c56c65fb TT |
1636 | rpcrdma_unmap_one(struct rpcrdma_ia *ia, struct rpcrdma_mr_seg *seg) |
1637 | { | |
1638 | if (seg->mr_page) | |
1639 | ib_dma_unmap_page(ia->ri_id->device, | |
1640 | seg->mr_dma, seg->mr_dmalen, seg->mr_dir); | |
1641 | else | |
1642 | ib_dma_unmap_single(ia->ri_id->device, | |
1643 | seg->mr_dma, seg->mr_dmalen, seg->mr_dir); | |
1644 | } | |
1645 | ||
c56c65fb TT |
1646 | /* |
1647 | * Prepost any receive buffer, then post send. | |
1648 | * | |
1649 | * Receive buffer is donated to hardware, reclaimed upon recv completion. | |
1650 | */ | |
1651 | int | |
1652 | rpcrdma_ep_post(struct rpcrdma_ia *ia, | |
1653 | struct rpcrdma_ep *ep, | |
1654 | struct rpcrdma_req *req) | |
1655 | { | |
1656 | struct ib_send_wr send_wr, *send_wr_fail; | |
1657 | struct rpcrdma_rep *rep = req->rl_reply; | |
1658 | int rc; | |
1659 | ||
1660 | if (rep) { | |
1661 | rc = rpcrdma_ep_post_recv(ia, ep, rep); | |
1662 | if (rc) | |
1663 | goto out; | |
1664 | req->rl_reply = NULL; | |
1665 | } | |
1666 | ||
1667 | send_wr.next = NULL; | |
1668 | send_wr.wr_id = 0ULL; /* no send cookie */ | |
1669 | send_wr.sg_list = req->rl_send_iov; | |
1670 | send_wr.num_sge = req->rl_niovs; | |
1671 | send_wr.opcode = IB_WR_SEND; | |
c56c65fb TT |
1672 | if (send_wr.num_sge == 4) /* no need to sync any pad (constant) */ |
1673 | ib_dma_sync_single_for_device(ia->ri_id->device, | |
1674 | req->rl_send_iov[3].addr, req->rl_send_iov[3].length, | |
1675 | DMA_TO_DEVICE); | |
1676 | ib_dma_sync_single_for_device(ia->ri_id->device, | |
1677 | req->rl_send_iov[1].addr, req->rl_send_iov[1].length, | |
1678 | DMA_TO_DEVICE); | |
1679 | ib_dma_sync_single_for_device(ia->ri_id->device, | |
1680 | req->rl_send_iov[0].addr, req->rl_send_iov[0].length, | |
1681 | DMA_TO_DEVICE); | |
1682 | ||
1683 | if (DECR_CQCOUNT(ep) > 0) | |
1684 | send_wr.send_flags = 0; | |
1685 | else { /* Provider must take a send completion every now and then */ | |
1686 | INIT_CQCOUNT(ep); | |
1687 | send_wr.send_flags = IB_SEND_SIGNALED; | |
1688 | } | |
1689 | ||
1690 | rc = ib_post_send(ia->ri_id->qp, &send_wr, &send_wr_fail); | |
1691 | if (rc) | |
1692 | dprintk("RPC: %s: ib_post_send returned %i\n", __func__, | |
1693 | rc); | |
1694 | out: | |
1695 | return rc; | |
1696 | } | |
1697 | ||
1698 | /* | |
1699 | * (Re)post a receive buffer. | |
1700 | */ | |
1701 | int | |
1702 | rpcrdma_ep_post_recv(struct rpcrdma_ia *ia, | |
1703 | struct rpcrdma_ep *ep, | |
1704 | struct rpcrdma_rep *rep) | |
1705 | { | |
1706 | struct ib_recv_wr recv_wr, *recv_wr_fail; | |
1707 | int rc; | |
1708 | ||
1709 | recv_wr.next = NULL; | |
1710 | recv_wr.wr_id = (u64) (unsigned long) rep; | |
6b1184cd | 1711 | recv_wr.sg_list = &rep->rr_rdmabuf->rg_iov; |
c56c65fb TT |
1712 | recv_wr.num_sge = 1; |
1713 | ||
1714 | ib_dma_sync_single_for_cpu(ia->ri_id->device, | |
6b1184cd CL |
1715 | rdmab_addr(rep->rr_rdmabuf), |
1716 | rdmab_length(rep->rr_rdmabuf), | |
1717 | DMA_BIDIRECTIONAL); | |
c56c65fb | 1718 | |
c56c65fb TT |
1719 | rc = ib_post_recv(ia->ri_id->qp, &recv_wr, &recv_wr_fail); |
1720 | ||
1721 | if (rc) | |
1722 | dprintk("RPC: %s: ib_post_recv returned %i\n", __func__, | |
1723 | rc); | |
1724 | return rc; | |
1725 | } | |
43e95988 | 1726 | |
1c9351ee | 1727 | /* How many chunk list items fit within our inline buffers? |
43e95988 | 1728 | */ |
1c9351ee CL |
1729 | unsigned int |
1730 | rpcrdma_max_segments(struct rpcrdma_xprt *r_xprt) | |
43e95988 CL |
1731 | { |
1732 | struct rpcrdma_create_data_internal *cdata = &r_xprt->rx_data; | |
1c9351ee | 1733 | int bytes, segments; |
43e95988 | 1734 | |
1c9351ee CL |
1735 | bytes = min_t(unsigned int, cdata->inline_wsize, cdata->inline_rsize); |
1736 | bytes -= RPCRDMA_HDRLEN_MIN; | |
1737 | if (bytes < sizeof(struct rpcrdma_segment) * 2) { | |
1738 | pr_warn("RPC: %s: inline threshold too small\n", | |
1739 | __func__); | |
1740 | return 0; | |
43e95988 | 1741 | } |
1c9351ee CL |
1742 | |
1743 | segments = 1 << (fls(bytes / sizeof(struct rpcrdma_segment)) - 1); | |
1744 | dprintk("RPC: %s: max chunk list size = %d segments\n", | |
1745 | __func__, segments); | |
1746 | return segments; | |
43e95988 | 1747 | } |