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 67static unsigned int xprt_rdma_slot_table_entries = RPCRDMA_DEF_SLOT_TABLE; 68unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE; 69unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE; 70unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRWR; 71int xprt_rdma_pad_optimize; 72static struct xprt_class xprt_rdma; 73 74#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 75 76static unsigned int min_slot_table_size = RPCRDMA_MIN_SLOT_TABLE; 77static unsigned int max_slot_table_size = RPCRDMA_MAX_SLOT_TABLE; 78static unsigned int min_inline_size = RPCRDMA_MIN_INLINE; 79static unsigned int max_inline_size = RPCRDMA_MAX_INLINE; 80static unsigned int max_padding = PAGE_SIZE; 81static unsigned int min_memreg = RPCRDMA_BOUNCEBUFFERS; 82static unsigned int max_memreg = RPCRDMA_LAST - 1; 83static unsigned int dummy; 84 85static struct ctl_table_header *sunrpc_table_header; 86 87static 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 145static const struct rpc_xprt_ops xprt_rdma_procs; 146 147static void 148xprt_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 159static void 160xprt_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 171void 172xprt_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 200void 201xprt_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 */ 223static void 224xprt_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 */ 259static void 260xprt_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 */ 275static void 276xprt_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 */ 292static 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 */ 302static struct rpc_xprt * 303xprt_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 */ 375void 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 */ 393static void 394xprt_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 */ 423static void 424xprt_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 */ 436static 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 */ 473static void 474xprt_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 */ 500static void 501xprt_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 513out_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 */ 524static void 525xprt_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 537static 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 */ 558static int 559xprt_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 577out_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 */ 587static void 588xprt_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 */ 621static int 622xprt_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 661failed_marshal: 662 if (rc != -ENOTCONN) 663 return rc; 664drop_connection: 665 xprt_rdma_close(xprt); 666 return -ENOTCONN; 667} 668 669void 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 710static int 711xprt_rdma_enable_swap(struct rpc_xprt *xprt) 712{ 713 return 0; 714} 715 716static void 717xprt_rdma_disable_swap(struct rpc_xprt *xprt) 718{ 719} 720 721/* 722 * Plumbing for rpc transport switch and kernel module 723 */ 724 725static 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 755static 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 764void 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 777int 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