1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2 /*
3 * Copyright (c) 2014-2017 Oracle. All rights reserved.
4 * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the BSD-type
10 * license below:
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 *
16 * Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 *
19 * Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials provided
22 * with the distribution.
23 *
24 * Neither the name of the Network Appliance, Inc. nor the names of
25 * its contributors may be used to endorse or promote products
26 * derived from this software without specific prior written
27 * permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 */
41
42 /*
43 * transport.c
44 *
45 * This file contains the top-level implementation of an RPC RDMA
46 * transport.
47 *
48 * Naming convention: functions beginning with xprt_ are part of the
49 * transport switch. All others are RPC RDMA internal.
50 */
51
52 #include <linux/module.h>
53 #include <linux/slab.h>
54 #include <linux/seq_file.h>
55 #include <linux/smp.h>
56
57 #include <linux/sunrpc/addr.h>
58 #include <linux/sunrpc/svc_rdma.h>
59
60 #include "xprt_rdma.h"
61 #include <trace/events/rpcrdma.h>
62
63 /*
64 * tunables
65 */
66
67 static unsigned int xprt_rdma_slot_table_entries = RPCRDMA_DEF_SLOT_TABLE;
68 unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE;
69 unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE;
70 unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRWR;
71 int xprt_rdma_pad_optimize;
72 static struct xprt_class xprt_rdma;
73
74 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
75
76 static unsigned int min_slot_table_size = RPCRDMA_MIN_SLOT_TABLE;
77 static unsigned int max_slot_table_size = RPCRDMA_MAX_SLOT_TABLE;
78 static unsigned int min_inline_size = RPCRDMA_MIN_INLINE;
79 static unsigned int max_inline_size = RPCRDMA_MAX_INLINE;
80 static unsigned int max_padding = PAGE_SIZE;
81 static unsigned int min_memreg = RPCRDMA_BOUNCEBUFFERS;
82 static unsigned int max_memreg = RPCRDMA_LAST - 1;
83 static unsigned int dummy;
84
85 static struct ctl_table_header *sunrpc_table_header;
86
87 static struct ctl_table xr_tunables_table[] = {
88 {
89 .procname = "rdma_slot_table_entries",
90 .data = &xprt_rdma_slot_table_entries,
91 .maxlen = sizeof(unsigned int),
92 .mode = 0644,
93 .proc_handler = proc_dointvec_minmax,
94 .extra1 = &min_slot_table_size,
95 .extra2 = &max_slot_table_size
96 },
97 {
98 .procname = "rdma_max_inline_read",
99 .data = &xprt_rdma_max_inline_read,
100 .maxlen = sizeof(unsigned int),
101 .mode = 0644,
102 .proc_handler = proc_dointvec_minmax,
103 .extra1 = &min_inline_size,
104 .extra2 = &max_inline_size,
105 },
106 {
107 .procname = "rdma_max_inline_write",
108 .data = &xprt_rdma_max_inline_write,
109 .maxlen = sizeof(unsigned int),
110 .mode = 0644,
111 .proc_handler = proc_dointvec_minmax,
112 .extra1 = &min_inline_size,
113 .extra2 = &max_inline_size,
114 },
115 {
116 .procname = "rdma_inline_write_padding",
117 .data = &dummy,
118 .maxlen = sizeof(unsigned int),
119 .mode = 0644,
120 .proc_handler = proc_dointvec_minmax,
121 .extra1 = SYSCTL_ZERO,
122 .extra2 = &max_padding,
123 },
124 {
125 .procname = "rdma_memreg_strategy",
126 .data = &xprt_rdma_memreg_strategy,
127 .maxlen = sizeof(unsigned int),
128 .mode = 0644,
129 .proc_handler = proc_dointvec_minmax,
130 .extra1 = &min_memreg,
131 .extra2 = &max_memreg,
132 },
133 {
134 .procname = "rdma_pad_optimize",
135 .data = &xprt_rdma_pad_optimize,
136 .maxlen = sizeof(unsigned int),
137 .mode = 0644,
138 .proc_handler = proc_dointvec,
139 },
140 { },
141 };
142
143 #endif
144
145 static const struct rpc_xprt_ops xprt_rdma_procs;
146
147 static void
xprt_rdma_format_addresses4(struct rpc_xprt * xprt,struct sockaddr * sap)148 xprt_rdma_format_addresses4(struct rpc_xprt *xprt, struct sockaddr *sap)
149 {
150 struct sockaddr_in *sin = (struct sockaddr_in *)sap;
151 char buf[20];
152
153 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
154 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
155
156 xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA;
157 }
158
159 static void
xprt_rdma_format_addresses6(struct rpc_xprt * xprt,struct sockaddr * sap)160 xprt_rdma_format_addresses6(struct rpc_xprt *xprt, struct sockaddr *sap)
161 {
162 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap;
163 char buf[40];
164
165 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
166 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
167
168 xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA6;
169 }
170
171 void
xprt_rdma_format_addresses(struct rpc_xprt * xprt,struct sockaddr * sap)172 xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap)
173 {
174 char buf[128];
175
176 switch (sap->sa_family) {
177 case AF_INET:
178 xprt_rdma_format_addresses4(xprt, sap);
179 break;
180 case AF_INET6:
181 xprt_rdma_format_addresses6(xprt, sap);
182 break;
183 default:
184 pr_err("rpcrdma: Unrecognized address family\n");
185 return;
186 }
187
188 (void)rpc_ntop(sap, buf, sizeof(buf));
189 xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL);
190
191 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
192 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
193
194 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
195 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
196
197 xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma";
198 }
199
200 void
xprt_rdma_free_addresses(struct rpc_xprt * xprt)201 xprt_rdma_free_addresses(struct rpc_xprt *xprt)
202 {
203 unsigned int i;
204
205 for (i = 0; i < RPC_DISPLAY_MAX; i++)
206 switch (i) {
207 case RPC_DISPLAY_PROTO:
208 case RPC_DISPLAY_NETID:
209 continue;
210 default:
211 kfree(xprt->address_strings[i]);
212 }
213 }
214
215 /**
216 * xprt_rdma_connect_worker - establish connection in the background
217 * @work: worker thread context
218 *
219 * Requester holds the xprt's send lock to prevent activity on this
220 * transport while a fresh connection is being established. RPC tasks
221 * sleep on the xprt's pending queue waiting for connect to complete.
222 */
223 static void
xprt_rdma_connect_worker(struct work_struct * work)224 xprt_rdma_connect_worker(struct work_struct *work)
225 {
226 struct rpcrdma_xprt *r_xprt = container_of(work, struct rpcrdma_xprt,
227 rx_connect_worker.work);
228 struct rpc_xprt *xprt = &r_xprt->rx_xprt;
229 unsigned int pflags = current->flags;
230 int rc;
231
232 if (atomic_read(&xprt->swapper))
233 current->flags |= PF_MEMALLOC;
234 rc = rpcrdma_xprt_connect(r_xprt);
235 xprt_clear_connecting(xprt);
236 if (!rc) {
237 xprt->connect_cookie++;
238 xprt->stat.connect_count++;
239 xprt->stat.connect_time += (long)jiffies -
240 xprt->stat.connect_start;
241 xprt_set_connected(xprt);
242 rc = -EAGAIN;
243 } else
244 rpcrdma_xprt_disconnect(r_xprt);
245 xprt_unlock_connect(xprt, r_xprt);
246 xprt_wake_pending_tasks(xprt, rc);
247 current_restore_flags(pflags, PF_MEMALLOC);
248 }
249
250 /**
251 * xprt_rdma_inject_disconnect - inject a connection fault
252 * @xprt: transport context
253 *
254 * If @xprt is connected, disconnect it to simulate spurious
255 * connection loss. Caller must hold @xprt's send lock to
256 * ensure that data structures and hardware resources are
257 * stable during the rdma_disconnect() call.
258 */
259 static void
xprt_rdma_inject_disconnect(struct rpc_xprt * xprt)260 xprt_rdma_inject_disconnect(struct rpc_xprt *xprt)
261 {
262 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
263
264 trace_xprtrdma_op_inject_dsc(r_xprt);
265 rdma_disconnect(r_xprt->rx_ep->re_id);
266 }
267
268 /**
269 * xprt_rdma_destroy - Full tear down of transport
270 * @xprt: doomed transport context
271 *
272 * Caller guarantees there will be no more calls to us with
273 * this @xprt.
274 */
275 static void
xprt_rdma_destroy(struct rpc_xprt * xprt)276 xprt_rdma_destroy(struct rpc_xprt *xprt)
277 {
278 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
279
280 cancel_delayed_work_sync(&r_xprt->rx_connect_worker);
281
282 rpcrdma_xprt_disconnect(r_xprt);
283 rpcrdma_buffer_destroy(&r_xprt->rx_buf);
284
285 xprt_rdma_free_addresses(xprt);
286 xprt_free(xprt);
287
288 module_put(THIS_MODULE);
289 }
290
291 /* 60 second timeout, no retries */
292 static const struct rpc_timeout xprt_rdma_default_timeout = {
293 .to_initval = 60 * HZ,
294 .to_maxval = 60 * HZ,
295 };
296
297 /**
298 * xprt_setup_rdma - Set up transport to use RDMA
299 *
300 * @args: rpc transport arguments
301 */
302 static struct rpc_xprt *
xprt_setup_rdma(struct xprt_create * args)303 xprt_setup_rdma(struct xprt_create *args)
304 {
305 struct rpc_xprt *xprt;
306 struct rpcrdma_xprt *new_xprt;
307 struct sockaddr *sap;
308 int rc;
309
310 if (args->addrlen > sizeof(xprt->addr))
311 return ERR_PTR(-EBADF);
312
313 if (!try_module_get(THIS_MODULE))
314 return ERR_PTR(-EIO);
315
316 xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt), 0,
317 xprt_rdma_slot_table_entries);
318 if (!xprt) {
319 module_put(THIS_MODULE);
320 return ERR_PTR(-ENOMEM);
321 }
322
323 xprt->timeout = &xprt_rdma_default_timeout;
324 xprt->connect_timeout = xprt->timeout->to_initval;
325 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
326 xprt->bind_timeout = RPCRDMA_BIND_TO;
327 xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
328 xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO;
329
330 xprt->resvport = 0; /* privileged port not needed */
331 xprt->ops = &xprt_rdma_procs;
332
333 /*
334 * Set up RDMA-specific connect data.
335 */
336 sap = args->dstaddr;
337
338 /* Ensure xprt->addr holds valid server TCP (not RDMA)
339 * address, for any side protocols which peek at it */
340 xprt->prot = IPPROTO_TCP;
341 xprt->xprt_class = &xprt_rdma;
342 xprt->addrlen = args->addrlen;
343 memcpy(&xprt->addr, sap, xprt->addrlen);
344
345 if (rpc_get_port(sap))
346 xprt_set_bound(xprt);
347 xprt_rdma_format_addresses(xprt, sap);
348
349 new_xprt = rpcx_to_rdmax(xprt);
350 rc = rpcrdma_buffer_create(new_xprt);
351 if (rc) {
352 xprt_rdma_free_addresses(xprt);
353 xprt_free(xprt);
354 module_put(THIS_MODULE);
355 return ERR_PTR(rc);
356 }
357
358 INIT_DELAYED_WORK(&new_xprt->rx_connect_worker,
359 xprt_rdma_connect_worker);
360
361 xprt->max_payload = RPCRDMA_MAX_DATA_SEGS << PAGE_SHIFT;
362
363 return xprt;
364 }
365
366 /**
367 * xprt_rdma_close - close a transport connection
368 * @xprt: transport context
369 *
370 * Called during autoclose or device removal.
371 *
372 * Caller holds @xprt's send lock to prevent activity on this
373 * transport while the connection is torn down.
374 */
xprt_rdma_close(struct rpc_xprt * xprt)375 void xprt_rdma_close(struct rpc_xprt *xprt)
376 {
377 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
378
379 rpcrdma_xprt_disconnect(r_xprt);
380
381 xprt->reestablish_timeout = 0;
382 ++xprt->connect_cookie;
383 xprt_disconnect_done(xprt);
384 }
385
386 /**
387 * xprt_rdma_set_port - update server port with rpcbind result
388 * @xprt: controlling RPC transport
389 * @port: new port value
390 *
391 * Transport connect status is unchanged.
392 */
393 static void
xprt_rdma_set_port(struct rpc_xprt * xprt,u16 port)394 xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port)
395 {
396 struct sockaddr *sap = (struct sockaddr *)&xprt->addr;
397 char buf[8];
398
399 rpc_set_port(sap, port);
400
401 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
402 snprintf(buf, sizeof(buf), "%u", port);
403 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
404
405 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
406 snprintf(buf, sizeof(buf), "%4hx", port);
407 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
408 }
409
410 /**
411 * xprt_rdma_timer - invoked when an RPC times out
412 * @xprt: controlling RPC transport
413 * @task: RPC task that timed out
414 *
415 * Invoked when the transport is still connected, but an RPC
416 * retransmit timeout occurs.
417 *
418 * Since RDMA connections don't have a keep-alive, forcibly
419 * disconnect and retry to connect. This drives full
420 * detection of the network path, and retransmissions of
421 * all pending RPCs.
422 */
423 static void
xprt_rdma_timer(struct rpc_xprt * xprt,struct rpc_task * task)424 xprt_rdma_timer(struct rpc_xprt *xprt, struct rpc_task *task)
425 {
426 xprt_force_disconnect(xprt);
427 }
428
429 /**
430 * xprt_rdma_set_connect_timeout - set timeouts for establishing a connection
431 * @xprt: controlling transport instance
432 * @connect_timeout: reconnect timeout after client disconnects
433 * @reconnect_timeout: reconnect timeout after server disconnects
434 *
435 */
xprt_rdma_set_connect_timeout(struct rpc_xprt * xprt,unsigned long connect_timeout,unsigned long reconnect_timeout)436 static void xprt_rdma_set_connect_timeout(struct rpc_xprt *xprt,
437 unsigned long connect_timeout,
438 unsigned long reconnect_timeout)
439 {
440 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
441
442 trace_xprtrdma_op_set_cto(r_xprt, connect_timeout, reconnect_timeout);
443
444 spin_lock(&xprt->transport_lock);
445
446 if (connect_timeout < xprt->connect_timeout) {
447 struct rpc_timeout to;
448 unsigned long initval;
449
450 to = *xprt->timeout;
451 initval = connect_timeout;
452 if (initval < RPCRDMA_INIT_REEST_TO << 1)
453 initval = RPCRDMA_INIT_REEST_TO << 1;
454 to.to_initval = initval;
455 to.to_maxval = initval;
456 r_xprt->rx_timeout = to;
457 xprt->timeout = &r_xprt->rx_timeout;
458 xprt->connect_timeout = connect_timeout;
459 }
460
461 if (reconnect_timeout < xprt->max_reconnect_timeout)
462 xprt->max_reconnect_timeout = reconnect_timeout;
463
464 spin_unlock(&xprt->transport_lock);
465 }
466
467 /**
468 * xprt_rdma_connect - schedule an attempt to reconnect
469 * @xprt: transport state
470 * @task: RPC scheduler context (unused)
471 *
472 */
473 static void
xprt_rdma_connect(struct rpc_xprt * xprt,struct rpc_task * task)474 xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task)
475 {
476 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
477 struct rpcrdma_ep *ep = r_xprt->rx_ep;
478 unsigned long delay;
479
480 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, r_xprt));
481
482 delay = 0;
483 if (ep && ep->re_connect_status != 0) {
484 delay = xprt_reconnect_delay(xprt);
485 xprt_reconnect_backoff(xprt, RPCRDMA_INIT_REEST_TO);
486 }
487 trace_xprtrdma_op_connect(r_xprt, delay);
488 queue_delayed_work(system_long_wq, &r_xprt->rx_connect_worker, delay);
489 }
490
491 /**
492 * xprt_rdma_alloc_slot - allocate an rpc_rqst
493 * @xprt: controlling RPC transport
494 * @task: RPC task requesting a fresh rpc_rqst
495 *
496 * tk_status values:
497 * %0 if task->tk_rqstp points to a fresh rpc_rqst
498 * %-EAGAIN if no rpc_rqst is available; queued on backlog
499 */
500 static void
xprt_rdma_alloc_slot(struct rpc_xprt * xprt,struct rpc_task * task)501 xprt_rdma_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task)
502 {
503 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
504 struct rpcrdma_req *req;
505
506 req = rpcrdma_buffer_get(&r_xprt->rx_buf);
507 if (!req)
508 goto out_sleep;
509 task->tk_rqstp = &req->rl_slot;
510 task->tk_status = 0;
511 return;
512
513 out_sleep:
514 task->tk_status = -ENOMEM;
515 xprt_add_backlog(xprt, task);
516 }
517
518 /**
519 * xprt_rdma_free_slot - release an rpc_rqst
520 * @xprt: controlling RPC transport
521 * @rqst: rpc_rqst to release
522 *
523 */
524 static void
xprt_rdma_free_slot(struct rpc_xprt * xprt,struct rpc_rqst * rqst)525 xprt_rdma_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *rqst)
526 {
527 struct rpcrdma_xprt *r_xprt =
528 container_of(xprt, struct rpcrdma_xprt, rx_xprt);
529
530 rpcrdma_reply_put(&r_xprt->rx_buf, rpcr_to_rdmar(rqst));
531 if (!xprt_wake_up_backlog(xprt, rqst)) {
532 memset(rqst, 0, sizeof(*rqst));
533 rpcrdma_buffer_put(&r_xprt->rx_buf, rpcr_to_rdmar(rqst));
534 }
535 }
536
rpcrdma_check_regbuf(struct rpcrdma_xprt * r_xprt,struct rpcrdma_regbuf * rb,size_t size,gfp_t flags)537 static bool rpcrdma_check_regbuf(struct rpcrdma_xprt *r_xprt,
538 struct rpcrdma_regbuf *rb, size_t size,
539 gfp_t flags)
540 {
541 if (unlikely(rdmab_length(rb) < size)) {
542 if (!rpcrdma_regbuf_realloc(rb, size, flags))
543 return false;
544 r_xprt->rx_stats.hardway_register_count += size;
545 }
546 return true;
547 }
548
549 /**
550 * xprt_rdma_allocate - allocate transport resources for an RPC
551 * @task: RPC task
552 *
553 * Return values:
554 * 0: Success; rq_buffer points to RPC buffer to use
555 * ENOMEM: Out of memory, call again later
556 * EIO: A permanent error occurred, do not retry
557 */
558 static int
xprt_rdma_allocate(struct rpc_task * task)559 xprt_rdma_allocate(struct rpc_task *task)
560 {
561 struct rpc_rqst *rqst = task->tk_rqstp;
562 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt);
563 struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
564 gfp_t flags = rpc_task_gfp_mask();
565
566 if (!rpcrdma_check_regbuf(r_xprt, req->rl_sendbuf, rqst->rq_callsize,
567 flags))
568 goto out_fail;
569 if (!rpcrdma_check_regbuf(r_xprt, req->rl_recvbuf, rqst->rq_rcvsize,
570 flags))
571 goto out_fail;
572
573 rqst->rq_buffer = rdmab_data(req->rl_sendbuf);
574 rqst->rq_rbuffer = rdmab_data(req->rl_recvbuf);
575 return 0;
576
577 out_fail:
578 return -ENOMEM;
579 }
580
581 /**
582 * xprt_rdma_free - release resources allocated by xprt_rdma_allocate
583 * @task: RPC task
584 *
585 * Caller guarantees rqst->rq_buffer is non-NULL.
586 */
587 static void
xprt_rdma_free(struct rpc_task * task)588 xprt_rdma_free(struct rpc_task *task)
589 {
590 struct rpc_rqst *rqst = task->tk_rqstp;
591 struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
592
593 if (unlikely(!list_empty(&req->rl_registered))) {
594 trace_xprtrdma_mrs_zap(task);
595 frwr_unmap_sync(rpcx_to_rdmax(rqst->rq_xprt), req);
596 }
597
598 /* XXX: If the RPC is completing because of a signal and
599 * not because a reply was received, we ought to ensure
600 * that the Send completion has fired, so that memory
601 * involved with the Send is not still visible to the NIC.
602 */
603 }
604
605 /**
606 * xprt_rdma_send_request - marshal and send an RPC request
607 * @rqst: RPC message in rq_snd_buf
608 *
609 * Caller holds the transport's write lock.
610 *
611 * Returns:
612 * %0 if the RPC message has been sent
613 * %-ENOTCONN if the caller should reconnect and call again
614 * %-EAGAIN if the caller should call again
615 * %-ENOBUFS if the caller should call again after a delay
616 * %-EMSGSIZE if encoding ran out of buffer space. The request
617 * was not sent. Do not try to send this message again.
618 * %-EIO if an I/O error occurred. The request was not sent.
619 * Do not try to send this message again.
620 */
621 static int
xprt_rdma_send_request(struct rpc_rqst * rqst)622 xprt_rdma_send_request(struct rpc_rqst *rqst)
623 {
624 struct rpc_xprt *xprt = rqst->rq_xprt;
625 struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
626 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
627 int rc = 0;
628
629 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
630 if (unlikely(!rqst->rq_buffer))
631 return xprt_rdma_bc_send_reply(rqst);
632 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
633
634 if (!xprt_connected(xprt))
635 return -ENOTCONN;
636
637 if (!xprt_request_get_cong(xprt, rqst))
638 return -EBADSLT;
639
640 rc = rpcrdma_marshal_req(r_xprt, rqst);
641 if (rc < 0)
642 goto failed_marshal;
643
644 /* Must suppress retransmit to maintain credits */
645 if (rqst->rq_connect_cookie == xprt->connect_cookie)
646 goto drop_connection;
647 rqst->rq_xtime = ktime_get();
648
649 if (frwr_send(r_xprt, req))
650 goto drop_connection;
651
652 rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len;
653
654 /* An RPC with no reply will throw off credit accounting,
655 * so drop the connection to reset the credit grant.
656 */
657 if (!rpc_reply_expected(rqst->rq_task))
658 goto drop_connection;
659 return 0;
660
661 failed_marshal:
662 if (rc != -ENOTCONN)
663 return rc;
664 drop_connection:
665 xprt_rdma_close(xprt);
666 return -ENOTCONN;
667 }
668
xprt_rdma_print_stats(struct rpc_xprt * xprt,struct seq_file * seq)669 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
670 {
671 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
672 long idle_time = 0;
673
674 if (xprt_connected(xprt))
675 idle_time = (long)(jiffies - xprt->last_used) / HZ;
676
677 seq_puts(seq, "\txprt:\trdma ");
678 seq_printf(seq, "%u %lu %lu %lu %ld %lu %lu %lu %llu %llu ",
679 0, /* need a local port? */
680 xprt->stat.bind_count,
681 xprt->stat.connect_count,
682 xprt->stat.connect_time / HZ,
683 idle_time,
684 xprt->stat.sends,
685 xprt->stat.recvs,
686 xprt->stat.bad_xids,
687 xprt->stat.req_u,
688 xprt->stat.bklog_u);
689 seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %lu %lu %lu %lu ",
690 r_xprt->rx_stats.read_chunk_count,
691 r_xprt->rx_stats.write_chunk_count,
692 r_xprt->rx_stats.reply_chunk_count,
693 r_xprt->rx_stats.total_rdma_request,
694 r_xprt->rx_stats.total_rdma_reply,
695 r_xprt->rx_stats.pullup_copy_count,
696 r_xprt->rx_stats.fixup_copy_count,
697 r_xprt->rx_stats.hardway_register_count,
698 r_xprt->rx_stats.failed_marshal_count,
699 r_xprt->rx_stats.bad_reply_count,
700 r_xprt->rx_stats.nomsg_call_count);
701 seq_printf(seq, "%lu %lu %lu %lu %lu %lu\n",
702 r_xprt->rx_stats.mrs_recycled,
703 r_xprt->rx_stats.mrs_orphaned,
704 r_xprt->rx_stats.mrs_allocated,
705 r_xprt->rx_stats.local_inv_needed,
706 r_xprt->rx_stats.empty_sendctx_q,
707 r_xprt->rx_stats.reply_waits_for_send);
708 }
709
710 static int
xprt_rdma_enable_swap(struct rpc_xprt * xprt)711 xprt_rdma_enable_swap(struct rpc_xprt *xprt)
712 {
713 return 0;
714 }
715
716 static void
xprt_rdma_disable_swap(struct rpc_xprt * xprt)717 xprt_rdma_disable_swap(struct rpc_xprt *xprt)
718 {
719 }
720
721 /*
722 * Plumbing for rpc transport switch and kernel module
723 */
724
725 static const struct rpc_xprt_ops xprt_rdma_procs = {
726 .reserve_xprt = xprt_reserve_xprt_cong,
727 .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */
728 .alloc_slot = xprt_rdma_alloc_slot,
729 .free_slot = xprt_rdma_free_slot,
730 .release_request = xprt_release_rqst_cong, /* ditto */
731 .wait_for_reply_request = xprt_wait_for_reply_request_def, /* ditto */
732 .timer = xprt_rdma_timer,
733 .rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */
734 .set_port = xprt_rdma_set_port,
735 .connect = xprt_rdma_connect,
736 .buf_alloc = xprt_rdma_allocate,
737 .buf_free = xprt_rdma_free,
738 .send_request = xprt_rdma_send_request,
739 .close = xprt_rdma_close,
740 .destroy = xprt_rdma_destroy,
741 .set_connect_timeout = xprt_rdma_set_connect_timeout,
742 .print_stats = xprt_rdma_print_stats,
743 .enable_swap = xprt_rdma_enable_swap,
744 .disable_swap = xprt_rdma_disable_swap,
745 .inject_disconnect = xprt_rdma_inject_disconnect,
746 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
747 .bc_setup = xprt_rdma_bc_setup,
748 .bc_maxpayload = xprt_rdma_bc_maxpayload,
749 .bc_num_slots = xprt_rdma_bc_max_slots,
750 .bc_free_rqst = xprt_rdma_bc_free_rqst,
751 .bc_destroy = xprt_rdma_bc_destroy,
752 #endif
753 };
754
755 static struct xprt_class xprt_rdma = {
756 .list = LIST_HEAD_INIT(xprt_rdma.list),
757 .name = "rdma",
758 .owner = THIS_MODULE,
759 .ident = XPRT_TRANSPORT_RDMA,
760 .setup = xprt_setup_rdma,
761 .netid = { "rdma", "rdma6", "" },
762 };
763
xprt_rdma_cleanup(void)764 void xprt_rdma_cleanup(void)
765 {
766 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
767 if (sunrpc_table_header) {
768 unregister_sysctl_table(sunrpc_table_header);
769 sunrpc_table_header = NULL;
770 }
771 #endif
772
773 xprt_unregister_transport(&xprt_rdma);
774 xprt_unregister_transport(&xprt_rdma_bc);
775 }
776
xprt_rdma_init(void)777 int xprt_rdma_init(void)
778 {
779 int rc;
780
781 rc = xprt_register_transport(&xprt_rdma);
782 if (rc)
783 return rc;
784
785 rc = xprt_register_transport(&xprt_rdma_bc);
786 if (rc) {
787 xprt_unregister_transport(&xprt_rdma);
788 return rc;
789 }
790
791 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
792 if (!sunrpc_table_header)
793 sunrpc_table_header = register_sysctl("sunrpc", xr_tunables_table);
794 #endif
795 return 0;
796 }
797