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 static struct ctl_table sunrpc_table[] = { 144 { 145 .procname = "sunrpc", 146 .mode = 0555, 147 .child = xr_tunables_table 148 }, 149 { }, 150 }; 151 152 #endif 153 154 static const struct rpc_xprt_ops xprt_rdma_procs; 155 156 static void 157 xprt_rdma_format_addresses4(struct rpc_xprt *xprt, struct sockaddr *sap) 158 { 159 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 160 char buf[20]; 161 162 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); 163 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 164 165 xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA; 166 } 167 168 static void 169 xprt_rdma_format_addresses6(struct rpc_xprt *xprt, struct sockaddr *sap) 170 { 171 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 172 char buf[40]; 173 174 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); 175 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 176 177 xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA6; 178 } 179 180 void 181 xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap) 182 { 183 char buf[128]; 184 185 switch (sap->sa_family) { 186 case AF_INET: 187 xprt_rdma_format_addresses4(xprt, sap); 188 break; 189 case AF_INET6: 190 xprt_rdma_format_addresses6(xprt, sap); 191 break; 192 default: 193 pr_err("rpcrdma: Unrecognized address family\n"); 194 return; 195 } 196 197 (void)rpc_ntop(sap, buf, sizeof(buf)); 198 xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL); 199 200 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); 201 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 202 203 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); 204 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 205 206 xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma"; 207 } 208 209 void 210 xprt_rdma_free_addresses(struct rpc_xprt *xprt) 211 { 212 unsigned int i; 213 214 for (i = 0; i < RPC_DISPLAY_MAX; i++) 215 switch (i) { 216 case RPC_DISPLAY_PROTO: 217 case RPC_DISPLAY_NETID: 218 continue; 219 default: 220 kfree(xprt->address_strings[i]); 221 } 222 } 223 224 /** 225 * xprt_rdma_connect_worker - establish connection in the background 226 * @work: worker thread context 227 * 228 * Requester holds the xprt's send lock to prevent activity on this 229 * transport while a fresh connection is being established. RPC tasks 230 * sleep on the xprt's pending queue waiting for connect to complete. 231 */ 232 static void 233 xprt_rdma_connect_worker(struct work_struct *work) 234 { 235 struct rpcrdma_xprt *r_xprt = container_of(work, struct rpcrdma_xprt, 236 rx_connect_worker.work); 237 struct rpc_xprt *xprt = &r_xprt->rx_xprt; 238 int rc; 239 240 rc = rpcrdma_xprt_connect(r_xprt); 241 xprt_clear_connecting(xprt); 242 if (!rc) { 243 xprt->connect_cookie++; 244 xprt->stat.connect_count++; 245 xprt->stat.connect_time += (long)jiffies - 246 xprt->stat.connect_start; 247 xprt_set_connected(xprt); 248 rc = -EAGAIN; 249 } else 250 rpcrdma_xprt_disconnect(r_xprt); 251 xprt_unlock_connect(xprt, r_xprt); 252 xprt_wake_pending_tasks(xprt, rc); 253 } 254 255 /** 256 * xprt_rdma_inject_disconnect - inject a connection fault 257 * @xprt: transport context 258 * 259 * If @xprt is connected, disconnect it to simulate spurious 260 * connection loss. Caller must hold @xprt's send lock to 261 * ensure that data structures and hardware resources are 262 * stable during the rdma_disconnect() call. 263 */ 264 static void 265 xprt_rdma_inject_disconnect(struct rpc_xprt *xprt) 266 { 267 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 268 269 trace_xprtrdma_op_inject_dsc(r_xprt); 270 rdma_disconnect(r_xprt->rx_ep->re_id); 271 } 272 273 /** 274 * xprt_rdma_destroy - Full tear down of transport 275 * @xprt: doomed transport context 276 * 277 * Caller guarantees there will be no more calls to us with 278 * this @xprt. 279 */ 280 static void 281 xprt_rdma_destroy(struct rpc_xprt *xprt) 282 { 283 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 284 285 cancel_delayed_work_sync(&r_xprt->rx_connect_worker); 286 287 rpcrdma_xprt_disconnect(r_xprt); 288 rpcrdma_buffer_destroy(&r_xprt->rx_buf); 289 290 xprt_rdma_free_addresses(xprt); 291 xprt_free(xprt); 292 293 module_put(THIS_MODULE); 294 } 295 296 /* 60 second timeout, no retries */ 297 static const struct rpc_timeout xprt_rdma_default_timeout = { 298 .to_initval = 60 * HZ, 299 .to_maxval = 60 * HZ, 300 }; 301 302 /** 303 * xprt_setup_rdma - Set up transport to use RDMA 304 * 305 * @args: rpc transport arguments 306 */ 307 static struct rpc_xprt * 308 xprt_setup_rdma(struct xprt_create *args) 309 { 310 struct rpc_xprt *xprt; 311 struct rpcrdma_xprt *new_xprt; 312 struct sockaddr *sap; 313 int rc; 314 315 if (args->addrlen > sizeof(xprt->addr)) 316 return ERR_PTR(-EBADF); 317 318 if (!try_module_get(THIS_MODULE)) 319 return ERR_PTR(-EIO); 320 321 xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt), 0, 322 xprt_rdma_slot_table_entries); 323 if (!xprt) { 324 module_put(THIS_MODULE); 325 return ERR_PTR(-ENOMEM); 326 } 327 328 xprt->timeout = &xprt_rdma_default_timeout; 329 xprt->connect_timeout = xprt->timeout->to_initval; 330 xprt->max_reconnect_timeout = xprt->timeout->to_maxval; 331 xprt->bind_timeout = RPCRDMA_BIND_TO; 332 xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO; 333 xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO; 334 335 xprt->resvport = 0; /* privileged port not needed */ 336 xprt->ops = &xprt_rdma_procs; 337 338 /* 339 * Set up RDMA-specific connect data. 340 */ 341 sap = args->dstaddr; 342 343 /* Ensure xprt->addr holds valid server TCP (not RDMA) 344 * address, for any side protocols which peek at it */ 345 xprt->prot = IPPROTO_TCP; 346 xprt->xprt_class = &xprt_rdma; 347 xprt->addrlen = args->addrlen; 348 memcpy(&xprt->addr, sap, xprt->addrlen); 349 350 if (rpc_get_port(sap)) 351 xprt_set_bound(xprt); 352 xprt_rdma_format_addresses(xprt, sap); 353 354 new_xprt = rpcx_to_rdmax(xprt); 355 rc = rpcrdma_buffer_create(new_xprt); 356 if (rc) { 357 xprt_rdma_free_addresses(xprt); 358 xprt_free(xprt); 359 module_put(THIS_MODULE); 360 return ERR_PTR(rc); 361 } 362 363 INIT_DELAYED_WORK(&new_xprt->rx_connect_worker, 364 xprt_rdma_connect_worker); 365 366 xprt->max_payload = RPCRDMA_MAX_DATA_SEGS << PAGE_SHIFT; 367 368 return xprt; 369 } 370 371 /** 372 * xprt_rdma_close - close a transport connection 373 * @xprt: transport context 374 * 375 * Called during autoclose or device removal. 376 * 377 * Caller holds @xprt's send lock to prevent activity on this 378 * transport while the connection is torn down. 379 */ 380 void xprt_rdma_close(struct rpc_xprt *xprt) 381 { 382 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 383 384 rpcrdma_xprt_disconnect(r_xprt); 385 386 xprt->reestablish_timeout = 0; 387 ++xprt->connect_cookie; 388 xprt_disconnect_done(xprt); 389 } 390 391 /** 392 * xprt_rdma_set_port - update server port with rpcbind result 393 * @xprt: controlling RPC transport 394 * @port: new port value 395 * 396 * Transport connect status is unchanged. 397 */ 398 static void 399 xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port) 400 { 401 struct sockaddr *sap = (struct sockaddr *)&xprt->addr; 402 char buf[8]; 403 404 rpc_set_port(sap, port); 405 406 kfree(xprt->address_strings[RPC_DISPLAY_PORT]); 407 snprintf(buf, sizeof(buf), "%u", port); 408 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 409 410 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); 411 snprintf(buf, sizeof(buf), "%4hx", port); 412 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 413 } 414 415 /** 416 * xprt_rdma_timer - invoked when an RPC times out 417 * @xprt: controlling RPC transport 418 * @task: RPC task that timed out 419 * 420 * Invoked when the transport is still connected, but an RPC 421 * retransmit timeout occurs. 422 * 423 * Since RDMA connections don't have a keep-alive, forcibly 424 * disconnect and retry to connect. This drives full 425 * detection of the network path, and retransmissions of 426 * all pending RPCs. 427 */ 428 static void 429 xprt_rdma_timer(struct rpc_xprt *xprt, struct rpc_task *task) 430 { 431 xprt_force_disconnect(xprt); 432 } 433 434 /** 435 * xprt_rdma_set_connect_timeout - set timeouts for establishing a connection 436 * @xprt: controlling transport instance 437 * @connect_timeout: reconnect timeout after client disconnects 438 * @reconnect_timeout: reconnect timeout after server disconnects 439 * 440 */ 441 static void xprt_rdma_set_connect_timeout(struct rpc_xprt *xprt, 442 unsigned long connect_timeout, 443 unsigned long reconnect_timeout) 444 { 445 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 446 447 trace_xprtrdma_op_set_cto(r_xprt, connect_timeout, reconnect_timeout); 448 449 spin_lock(&xprt->transport_lock); 450 451 if (connect_timeout < xprt->connect_timeout) { 452 struct rpc_timeout to; 453 unsigned long initval; 454 455 to = *xprt->timeout; 456 initval = connect_timeout; 457 if (initval < RPCRDMA_INIT_REEST_TO << 1) 458 initval = RPCRDMA_INIT_REEST_TO << 1; 459 to.to_initval = initval; 460 to.to_maxval = initval; 461 r_xprt->rx_timeout = to; 462 xprt->timeout = &r_xprt->rx_timeout; 463 xprt->connect_timeout = connect_timeout; 464 } 465 466 if (reconnect_timeout < xprt->max_reconnect_timeout) 467 xprt->max_reconnect_timeout = reconnect_timeout; 468 469 spin_unlock(&xprt->transport_lock); 470 } 471 472 /** 473 * xprt_rdma_connect - schedule an attempt to reconnect 474 * @xprt: transport state 475 * @task: RPC scheduler context (unused) 476 * 477 */ 478 static void 479 xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task) 480 { 481 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 482 struct rpcrdma_ep *ep = r_xprt->rx_ep; 483 unsigned long delay; 484 485 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, r_xprt)); 486 487 delay = 0; 488 if (ep && ep->re_connect_status != 0) { 489 delay = xprt_reconnect_delay(xprt); 490 xprt_reconnect_backoff(xprt, RPCRDMA_INIT_REEST_TO); 491 } 492 trace_xprtrdma_op_connect(r_xprt, delay); 493 queue_delayed_work(xprtiod_workqueue, &r_xprt->rx_connect_worker, 494 delay); 495 } 496 497 /** 498 * xprt_rdma_alloc_slot - allocate an rpc_rqst 499 * @xprt: controlling RPC transport 500 * @task: RPC task requesting a fresh rpc_rqst 501 * 502 * tk_status values: 503 * %0 if task->tk_rqstp points to a fresh rpc_rqst 504 * %-EAGAIN if no rpc_rqst is available; queued on backlog 505 */ 506 static void 507 xprt_rdma_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task) 508 { 509 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 510 struct rpcrdma_req *req; 511 512 req = rpcrdma_buffer_get(&r_xprt->rx_buf); 513 if (!req) 514 goto out_sleep; 515 task->tk_rqstp = &req->rl_slot; 516 task->tk_status = 0; 517 return; 518 519 out_sleep: 520 task->tk_status = -EAGAIN; 521 xprt_add_backlog(xprt, task); 522 } 523 524 /** 525 * xprt_rdma_free_slot - release an rpc_rqst 526 * @xprt: controlling RPC transport 527 * @rqst: rpc_rqst to release 528 * 529 */ 530 static void 531 xprt_rdma_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *rqst) 532 { 533 struct rpcrdma_xprt *r_xprt = 534 container_of(xprt, struct rpcrdma_xprt, rx_xprt); 535 536 rpcrdma_reply_put(&r_xprt->rx_buf, rpcr_to_rdmar(rqst)); 537 if (!xprt_wake_up_backlog(xprt, rqst)) { 538 memset(rqst, 0, sizeof(*rqst)); 539 rpcrdma_buffer_put(&r_xprt->rx_buf, rpcr_to_rdmar(rqst)); 540 } 541 } 542 543 static bool rpcrdma_check_regbuf(struct rpcrdma_xprt *r_xprt, 544 struct rpcrdma_regbuf *rb, size_t size, 545 gfp_t flags) 546 { 547 if (unlikely(rdmab_length(rb) < size)) { 548 if (!rpcrdma_regbuf_realloc(rb, size, flags)) 549 return false; 550 r_xprt->rx_stats.hardway_register_count += size; 551 } 552 return true; 553 } 554 555 /** 556 * xprt_rdma_allocate - allocate transport resources for an RPC 557 * @task: RPC task 558 * 559 * Return values: 560 * 0: Success; rq_buffer points to RPC buffer to use 561 * ENOMEM: Out of memory, call again later 562 * EIO: A permanent error occurred, do not retry 563 */ 564 static int 565 xprt_rdma_allocate(struct rpc_task *task) 566 { 567 struct rpc_rqst *rqst = task->tk_rqstp; 568 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt); 569 struct rpcrdma_req *req = rpcr_to_rdmar(rqst); 570 gfp_t flags; 571 572 flags = RPCRDMA_DEF_GFP; 573 if (RPC_IS_SWAPPER(task)) 574 flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN; 575 576 if (!rpcrdma_check_regbuf(r_xprt, req->rl_sendbuf, rqst->rq_callsize, 577 flags)) 578 goto out_fail; 579 if (!rpcrdma_check_regbuf(r_xprt, req->rl_recvbuf, rqst->rq_rcvsize, 580 flags)) 581 goto out_fail; 582 583 rqst->rq_buffer = rdmab_data(req->rl_sendbuf); 584 rqst->rq_rbuffer = rdmab_data(req->rl_recvbuf); 585 return 0; 586 587 out_fail: 588 return -ENOMEM; 589 } 590 591 /** 592 * xprt_rdma_free - release resources allocated by xprt_rdma_allocate 593 * @task: RPC task 594 * 595 * Caller guarantees rqst->rq_buffer is non-NULL. 596 */ 597 static void 598 xprt_rdma_free(struct rpc_task *task) 599 { 600 struct rpc_rqst *rqst = task->tk_rqstp; 601 struct rpcrdma_req *req = rpcr_to_rdmar(rqst); 602 603 if (unlikely(!list_empty(&req->rl_registered))) { 604 trace_xprtrdma_mrs_zap(task); 605 frwr_unmap_sync(rpcx_to_rdmax(rqst->rq_xprt), req); 606 } 607 608 /* XXX: If the RPC is completing because of a signal and 609 * not because a reply was received, we ought to ensure 610 * that the Send completion has fired, so that memory 611 * involved with the Send is not still visible to the NIC. 612 */ 613 } 614 615 /** 616 * xprt_rdma_send_request - marshal and send an RPC request 617 * @rqst: RPC message in rq_snd_buf 618 * 619 * Caller holds the transport's write lock. 620 * 621 * Returns: 622 * %0 if the RPC message has been sent 623 * %-ENOTCONN if the caller should reconnect and call again 624 * %-EAGAIN if the caller should call again 625 * %-ENOBUFS if the caller should call again after a delay 626 * %-EMSGSIZE if encoding ran out of buffer space. The request 627 * was not sent. Do not try to send this message again. 628 * %-EIO if an I/O error occurred. The request was not sent. 629 * Do not try to send this message again. 630 */ 631 static int 632 xprt_rdma_send_request(struct rpc_rqst *rqst) 633 { 634 struct rpc_xprt *xprt = rqst->rq_xprt; 635 struct rpcrdma_req *req = rpcr_to_rdmar(rqst); 636 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 637 int rc = 0; 638 639 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 640 if (unlikely(!rqst->rq_buffer)) 641 return xprt_rdma_bc_send_reply(rqst); 642 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 643 644 if (!xprt_connected(xprt)) 645 return -ENOTCONN; 646 647 if (!xprt_request_get_cong(xprt, rqst)) 648 return -EBADSLT; 649 650 rc = rpcrdma_marshal_req(r_xprt, rqst); 651 if (rc < 0) 652 goto failed_marshal; 653 654 /* Must suppress retransmit to maintain credits */ 655 if (rqst->rq_connect_cookie == xprt->connect_cookie) 656 goto drop_connection; 657 rqst->rq_xtime = ktime_get(); 658 659 if (frwr_send(r_xprt, req)) 660 goto drop_connection; 661 662 rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len; 663 664 /* An RPC with no reply will throw off credit accounting, 665 * so drop the connection to reset the credit grant. 666 */ 667 if (!rpc_reply_expected(rqst->rq_task)) 668 goto drop_connection; 669 return 0; 670 671 failed_marshal: 672 if (rc != -ENOTCONN) 673 return rc; 674 drop_connection: 675 xprt_rdma_close(xprt); 676 return -ENOTCONN; 677 } 678 679 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 680 { 681 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 682 long idle_time = 0; 683 684 if (xprt_connected(xprt)) 685 idle_time = (long)(jiffies - xprt->last_used) / HZ; 686 687 seq_puts(seq, "\txprt:\trdma "); 688 seq_printf(seq, "%u %lu %lu %lu %ld %lu %lu %lu %llu %llu ", 689 0, /* need a local port? */ 690 xprt->stat.bind_count, 691 xprt->stat.connect_count, 692 xprt->stat.connect_time / HZ, 693 idle_time, 694 xprt->stat.sends, 695 xprt->stat.recvs, 696 xprt->stat.bad_xids, 697 xprt->stat.req_u, 698 xprt->stat.bklog_u); 699 seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %lu %lu %lu %lu ", 700 r_xprt->rx_stats.read_chunk_count, 701 r_xprt->rx_stats.write_chunk_count, 702 r_xprt->rx_stats.reply_chunk_count, 703 r_xprt->rx_stats.total_rdma_request, 704 r_xprt->rx_stats.total_rdma_reply, 705 r_xprt->rx_stats.pullup_copy_count, 706 r_xprt->rx_stats.fixup_copy_count, 707 r_xprt->rx_stats.hardway_register_count, 708 r_xprt->rx_stats.failed_marshal_count, 709 r_xprt->rx_stats.bad_reply_count, 710 r_xprt->rx_stats.nomsg_call_count); 711 seq_printf(seq, "%lu %lu %lu %lu %lu %lu\n", 712 r_xprt->rx_stats.mrs_recycled, 713 r_xprt->rx_stats.mrs_orphaned, 714 r_xprt->rx_stats.mrs_allocated, 715 r_xprt->rx_stats.local_inv_needed, 716 r_xprt->rx_stats.empty_sendctx_q, 717 r_xprt->rx_stats.reply_waits_for_send); 718 } 719 720 static int 721 xprt_rdma_enable_swap(struct rpc_xprt *xprt) 722 { 723 return 0; 724 } 725 726 static void 727 xprt_rdma_disable_swap(struct rpc_xprt *xprt) 728 { 729 } 730 731 /* 732 * Plumbing for rpc transport switch and kernel module 733 */ 734 735 static const struct rpc_xprt_ops xprt_rdma_procs = { 736 .reserve_xprt = xprt_reserve_xprt_cong, 737 .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */ 738 .alloc_slot = xprt_rdma_alloc_slot, 739 .free_slot = xprt_rdma_free_slot, 740 .release_request = xprt_release_rqst_cong, /* ditto */ 741 .wait_for_reply_request = xprt_wait_for_reply_request_def, /* ditto */ 742 .timer = xprt_rdma_timer, 743 .rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */ 744 .set_port = xprt_rdma_set_port, 745 .connect = xprt_rdma_connect, 746 .buf_alloc = xprt_rdma_allocate, 747 .buf_free = xprt_rdma_free, 748 .send_request = xprt_rdma_send_request, 749 .close = xprt_rdma_close, 750 .destroy = xprt_rdma_destroy, 751 .set_connect_timeout = xprt_rdma_set_connect_timeout, 752 .print_stats = xprt_rdma_print_stats, 753 .enable_swap = xprt_rdma_enable_swap, 754 .disable_swap = xprt_rdma_disable_swap, 755 .inject_disconnect = xprt_rdma_inject_disconnect, 756 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 757 .bc_setup = xprt_rdma_bc_setup, 758 .bc_maxpayload = xprt_rdma_bc_maxpayload, 759 .bc_num_slots = xprt_rdma_bc_max_slots, 760 .bc_free_rqst = xprt_rdma_bc_free_rqst, 761 .bc_destroy = xprt_rdma_bc_destroy, 762 #endif 763 }; 764 765 static struct xprt_class xprt_rdma = { 766 .list = LIST_HEAD_INIT(xprt_rdma.list), 767 .name = "rdma", 768 .owner = THIS_MODULE, 769 .ident = XPRT_TRANSPORT_RDMA, 770 .setup = xprt_setup_rdma, 771 .netid = { "rdma", "rdma6", "" }, 772 }; 773 774 void xprt_rdma_cleanup(void) 775 { 776 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 777 if (sunrpc_table_header) { 778 unregister_sysctl_table(sunrpc_table_header); 779 sunrpc_table_header = NULL; 780 } 781 #endif 782 783 xprt_unregister_transport(&xprt_rdma); 784 xprt_unregister_transport(&xprt_rdma_bc); 785 } 786 787 int xprt_rdma_init(void) 788 { 789 int rc; 790 791 rc = xprt_register_transport(&xprt_rdma); 792 if (rc) 793 return rc; 794 795 rc = xprt_register_transport(&xprt_rdma_bc); 796 if (rc) { 797 xprt_unregister_transport(&xprt_rdma); 798 return rc; 799 } 800 801 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 802 if (!sunrpc_table_header) 803 sunrpc_table_header = register_sysctl_table(sunrpc_table); 804 #endif 805 return 0; 806 } 807