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