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 #endif 143 144 static const struct rpc_xprt_ops xprt_rdma_procs; 145 146 static void xprt_rdma_format_addresses4(struct rpc_xprt * xprt,struct sockaddr * sap)147 xprt_rdma_format_addresses4(struct rpc_xprt *xprt, struct sockaddr *sap) 148 { 149 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 150 char buf[20]; 151 152 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); 153 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 154 155 xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA; 156 } 157 158 static void xprt_rdma_format_addresses6(struct rpc_xprt * xprt,struct sockaddr * sap)159 xprt_rdma_format_addresses6(struct rpc_xprt *xprt, struct sockaddr *sap) 160 { 161 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 162 char buf[40]; 163 164 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); 165 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 166 167 xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA6; 168 } 169 170 void xprt_rdma_format_addresses(struct rpc_xprt * xprt,struct sockaddr * sap)171 xprt_rdma_format_addresses(struct rpc_xprt *xprt, struct sockaddr *sap) 172 { 173 char buf[128]; 174 175 switch (sap->sa_family) { 176 case AF_INET: 177 xprt_rdma_format_addresses4(xprt, sap); 178 break; 179 case AF_INET6: 180 xprt_rdma_format_addresses6(xprt, sap); 181 break; 182 default: 183 pr_err("rpcrdma: Unrecognized address family\n"); 184 return; 185 } 186 187 (void)rpc_ntop(sap, buf, sizeof(buf)); 188 xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL); 189 190 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); 191 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 192 193 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); 194 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 195 196 xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma"; 197 } 198 199 void xprt_rdma_free_addresses(struct rpc_xprt * xprt)200 xprt_rdma_free_addresses(struct rpc_xprt *xprt) 201 { 202 unsigned int i; 203 204 for (i = 0; i < RPC_DISPLAY_MAX; i++) 205 switch (i) { 206 case RPC_DISPLAY_PROTO: 207 case RPC_DISPLAY_NETID: 208 continue; 209 default: 210 kfree(xprt->address_strings[i]); 211 } 212 } 213 214 /** 215 * xprt_rdma_connect_worker - establish connection in the background 216 * @work: worker thread context 217 * 218 * Requester holds the xprt's send lock to prevent activity on this 219 * transport while a fresh connection is being established. RPC tasks 220 * sleep on the xprt's pending queue waiting for connect to complete. 221 */ 222 static void xprt_rdma_connect_worker(struct work_struct * work)223 xprt_rdma_connect_worker(struct work_struct *work) 224 { 225 struct rpcrdma_xprt *r_xprt = container_of(work, struct rpcrdma_xprt, 226 rx_connect_worker.work); 227 struct rpc_xprt *xprt = &r_xprt->rx_xprt; 228 unsigned int pflags = current->flags; 229 int rc; 230 231 if (atomic_read(&xprt->swapper)) 232 current->flags |= PF_MEMALLOC; 233 rc = rpcrdma_xprt_connect(r_xprt); 234 xprt_clear_connecting(xprt); 235 if (!rc) { 236 xprt->connect_cookie++; 237 xprt->stat.connect_count++; 238 xprt->stat.connect_time += (long)jiffies - 239 xprt->stat.connect_start; 240 xprt_set_connected(xprt); 241 rc = -EAGAIN; 242 } else 243 rpcrdma_xprt_disconnect(r_xprt); 244 xprt_unlock_connect(xprt, r_xprt); 245 xprt_wake_pending_tasks(xprt, rc); 246 current_restore_flags(pflags, PF_MEMALLOC); 247 } 248 249 /** 250 * xprt_rdma_inject_disconnect - inject a connection fault 251 * @xprt: transport context 252 * 253 * If @xprt is connected, disconnect it to simulate spurious 254 * connection loss. Caller must hold @xprt's send lock to 255 * ensure that data structures and hardware resources are 256 * stable during the rdma_disconnect() call. 257 */ 258 static void xprt_rdma_inject_disconnect(struct rpc_xprt * xprt)259 xprt_rdma_inject_disconnect(struct rpc_xprt *xprt) 260 { 261 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 262 263 trace_xprtrdma_op_inject_dsc(r_xprt); 264 rdma_disconnect(r_xprt->rx_ep->re_id); 265 } 266 267 /** 268 * xprt_rdma_destroy - Full tear down of transport 269 * @xprt: doomed transport context 270 * 271 * Caller guarantees there will be no more calls to us with 272 * this @xprt. 273 */ 274 static void xprt_rdma_destroy(struct rpc_xprt * xprt)275 xprt_rdma_destroy(struct rpc_xprt *xprt) 276 { 277 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 278 279 cancel_delayed_work_sync(&r_xprt->rx_connect_worker); 280 281 rpcrdma_xprt_disconnect(r_xprt); 282 rpcrdma_buffer_destroy(&r_xprt->rx_buf); 283 284 xprt_rdma_free_addresses(xprt); 285 xprt_free(xprt); 286 287 module_put(THIS_MODULE); 288 } 289 290 /* 60 second timeout, no retries */ 291 static const struct rpc_timeout xprt_rdma_default_timeout = { 292 .to_initval = 60 * HZ, 293 .to_maxval = 60 * HZ, 294 }; 295 296 /** 297 * xprt_setup_rdma - Set up transport to use RDMA 298 * 299 * @args: rpc transport arguments 300 */ 301 static struct rpc_xprt * xprt_setup_rdma(struct xprt_create * args)302 xprt_setup_rdma(struct xprt_create *args) 303 { 304 struct rpc_xprt *xprt; 305 struct rpcrdma_xprt *new_xprt; 306 struct sockaddr *sap; 307 int rc; 308 309 if (args->addrlen > sizeof(xprt->addr)) 310 return ERR_PTR(-EBADF); 311 312 if (!try_module_get(THIS_MODULE)) 313 return ERR_PTR(-EIO); 314 315 xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt), 0, 316 xprt_rdma_slot_table_entries); 317 if (!xprt) { 318 module_put(THIS_MODULE); 319 return ERR_PTR(-ENOMEM); 320 } 321 322 xprt->timeout = &xprt_rdma_default_timeout; 323 xprt->connect_timeout = xprt->timeout->to_initval; 324 xprt->max_reconnect_timeout = xprt->timeout->to_maxval; 325 xprt->bind_timeout = RPCRDMA_BIND_TO; 326 xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO; 327 xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO; 328 329 xprt->resvport = 0; /* privileged port not needed */ 330 xprt->ops = &xprt_rdma_procs; 331 332 /* 333 * Set up RDMA-specific connect data. 334 */ 335 sap = args->dstaddr; 336 337 /* Ensure xprt->addr holds valid server TCP (not RDMA) 338 * address, for any side protocols which peek at it */ 339 xprt->prot = IPPROTO_TCP; 340 xprt->xprt_class = &xprt_rdma; 341 xprt->addrlen = args->addrlen; 342 memcpy(&xprt->addr, sap, xprt->addrlen); 343 344 if (rpc_get_port(sap)) 345 xprt_set_bound(xprt); 346 xprt_rdma_format_addresses(xprt, sap); 347 348 new_xprt = rpcx_to_rdmax(xprt); 349 rc = rpcrdma_buffer_create(new_xprt); 350 if (rc) { 351 xprt_rdma_free_addresses(xprt); 352 xprt_free(xprt); 353 module_put(THIS_MODULE); 354 return ERR_PTR(rc); 355 } 356 357 INIT_DELAYED_WORK(&new_xprt->rx_connect_worker, 358 xprt_rdma_connect_worker); 359 360 xprt->max_payload = RPCRDMA_MAX_DATA_SEGS << PAGE_SHIFT; 361 362 return xprt; 363 } 364 365 /** 366 * xprt_rdma_close - close a transport connection 367 * @xprt: transport context 368 * 369 * Called during autoclose or device removal. 370 * 371 * Caller holds @xprt's send lock to prevent activity on this 372 * transport while the connection is torn down. 373 */ xprt_rdma_close(struct rpc_xprt * xprt)374 void xprt_rdma_close(struct rpc_xprt *xprt) 375 { 376 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 377 378 rpcrdma_xprt_disconnect(r_xprt); 379 380 xprt->reestablish_timeout = 0; 381 ++xprt->connect_cookie; 382 xprt_disconnect_done(xprt); 383 } 384 385 /** 386 * xprt_rdma_set_port - update server port with rpcbind result 387 * @xprt: controlling RPC transport 388 * @port: new port value 389 * 390 * Transport connect status is unchanged. 391 */ 392 static void xprt_rdma_set_port(struct rpc_xprt * xprt,u16 port)393 xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port) 394 { 395 struct sockaddr *sap = (struct sockaddr *)&xprt->addr; 396 char buf[8]; 397 398 rpc_set_port(sap, port); 399 400 kfree(xprt->address_strings[RPC_DISPLAY_PORT]); 401 snprintf(buf, sizeof(buf), "%u", port); 402 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 403 404 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]); 405 snprintf(buf, sizeof(buf), "%4hx", port); 406 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 407 } 408 409 /** 410 * xprt_rdma_timer - invoked when an RPC times out 411 * @xprt: controlling RPC transport 412 * @task: RPC task that timed out 413 * 414 * Invoked when the transport is still connected, but an RPC 415 * retransmit timeout occurs. 416 * 417 * Since RDMA connections don't have a keep-alive, forcibly 418 * disconnect and retry to connect. This drives full 419 * detection of the network path, and retransmissions of 420 * all pending RPCs. 421 */ 422 static void xprt_rdma_timer(struct rpc_xprt * xprt,struct rpc_task * task)423 xprt_rdma_timer(struct rpc_xprt *xprt, struct rpc_task *task) 424 { 425 xprt_force_disconnect(xprt); 426 } 427 428 /** 429 * xprt_rdma_set_connect_timeout - set timeouts for establishing a connection 430 * @xprt: controlling transport instance 431 * @connect_timeout: reconnect timeout after client disconnects 432 * @reconnect_timeout: reconnect timeout after server disconnects 433 * 434 */ xprt_rdma_set_connect_timeout(struct rpc_xprt * xprt,unsigned long connect_timeout,unsigned long reconnect_timeout)435 static void xprt_rdma_set_connect_timeout(struct rpc_xprt *xprt, 436 unsigned long connect_timeout, 437 unsigned long reconnect_timeout) 438 { 439 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 440 441 trace_xprtrdma_op_set_cto(r_xprt, connect_timeout, reconnect_timeout); 442 443 spin_lock(&xprt->transport_lock); 444 445 if (connect_timeout < xprt->connect_timeout) { 446 struct rpc_timeout to; 447 unsigned long initval; 448 449 to = *xprt->timeout; 450 initval = connect_timeout; 451 if (initval < RPCRDMA_INIT_REEST_TO << 1) 452 initval = RPCRDMA_INIT_REEST_TO << 1; 453 to.to_initval = initval; 454 to.to_maxval = initval; 455 r_xprt->rx_timeout = to; 456 xprt->timeout = &r_xprt->rx_timeout; 457 xprt->connect_timeout = connect_timeout; 458 } 459 460 if (reconnect_timeout < xprt->max_reconnect_timeout) 461 xprt->max_reconnect_timeout = reconnect_timeout; 462 463 spin_unlock(&xprt->transport_lock); 464 } 465 466 /** 467 * xprt_rdma_connect - schedule an attempt to reconnect 468 * @xprt: transport state 469 * @task: RPC scheduler context (unused) 470 * 471 */ 472 static void xprt_rdma_connect(struct rpc_xprt * xprt,struct rpc_task * task)473 xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task) 474 { 475 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 476 struct rpcrdma_ep *ep = r_xprt->rx_ep; 477 unsigned long delay; 478 479 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, r_xprt)); 480 481 delay = 0; 482 if (ep && ep->re_connect_status != 0) { 483 delay = xprt_reconnect_delay(xprt); 484 xprt_reconnect_backoff(xprt, RPCRDMA_INIT_REEST_TO); 485 } 486 trace_xprtrdma_op_connect(r_xprt, delay); 487 queue_delayed_work(system_long_wq, &r_xprt->rx_connect_worker, delay); 488 } 489 490 /** 491 * xprt_rdma_alloc_slot - allocate an rpc_rqst 492 * @xprt: controlling RPC transport 493 * @task: RPC task requesting a fresh rpc_rqst 494 * 495 * tk_status values: 496 * %0 if task->tk_rqstp points to a fresh rpc_rqst 497 * %-EAGAIN if no rpc_rqst is available; queued on backlog 498 */ 499 static void xprt_rdma_alloc_slot(struct rpc_xprt * xprt,struct rpc_task * task)500 xprt_rdma_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task) 501 { 502 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 503 struct rpcrdma_req *req; 504 505 req = rpcrdma_buffer_get(&r_xprt->rx_buf); 506 if (!req) 507 goto out_sleep; 508 task->tk_rqstp = &req->rl_slot; 509 task->tk_status = 0; 510 return; 511 512 out_sleep: 513 task->tk_status = -ENOMEM; 514 xprt_add_backlog(xprt, task); 515 } 516 517 /** 518 * xprt_rdma_free_slot - release an rpc_rqst 519 * @xprt: controlling RPC transport 520 * @rqst: rpc_rqst to release 521 * 522 */ 523 static void xprt_rdma_free_slot(struct rpc_xprt * xprt,struct rpc_rqst * rqst)524 xprt_rdma_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *rqst) 525 { 526 struct rpcrdma_xprt *r_xprt = 527 container_of(xprt, struct rpcrdma_xprt, rx_xprt); 528 529 rpcrdma_reply_put(&r_xprt->rx_buf, rpcr_to_rdmar(rqst)); 530 if (!xprt_wake_up_backlog(xprt, rqst)) { 531 memset(rqst, 0, sizeof(*rqst)); 532 rpcrdma_buffer_put(&r_xprt->rx_buf, rpcr_to_rdmar(rqst)); 533 } 534 } 535 rpcrdma_check_regbuf(struct rpcrdma_xprt * r_xprt,struct rpcrdma_regbuf * rb,size_t size,gfp_t flags)536 static bool rpcrdma_check_regbuf(struct rpcrdma_xprt *r_xprt, 537 struct rpcrdma_regbuf *rb, size_t size, 538 gfp_t flags) 539 { 540 if (unlikely(rdmab_length(rb) < size)) { 541 if (!rpcrdma_regbuf_realloc(rb, size, flags)) 542 return false; 543 r_xprt->rx_stats.hardway_register_count += size; 544 } 545 return true; 546 } 547 548 /** 549 * xprt_rdma_allocate - allocate transport resources for an RPC 550 * @task: RPC task 551 * 552 * Return values: 553 * 0: Success; rq_buffer points to RPC buffer to use 554 * ENOMEM: Out of memory, call again later 555 * EIO: A permanent error occurred, do not retry 556 */ 557 static int xprt_rdma_allocate(struct rpc_task * task)558 xprt_rdma_allocate(struct rpc_task *task) 559 { 560 struct rpc_rqst *rqst = task->tk_rqstp; 561 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(rqst->rq_xprt); 562 struct rpcrdma_req *req = rpcr_to_rdmar(rqst); 563 gfp_t flags = rpc_task_gfp_mask(); 564 565 if (!rpcrdma_check_regbuf(r_xprt, req->rl_sendbuf, rqst->rq_callsize, 566 flags)) 567 goto out_fail; 568 if (!rpcrdma_check_regbuf(r_xprt, req->rl_recvbuf, rqst->rq_rcvsize, 569 flags)) 570 goto out_fail; 571 572 rqst->rq_buffer = rdmab_data(req->rl_sendbuf); 573 rqst->rq_rbuffer = rdmab_data(req->rl_recvbuf); 574 return 0; 575 576 out_fail: 577 return -ENOMEM; 578 } 579 580 /** 581 * xprt_rdma_free - release resources allocated by xprt_rdma_allocate 582 * @task: RPC task 583 * 584 * Caller guarantees rqst->rq_buffer is non-NULL. 585 */ 586 static void xprt_rdma_free(struct rpc_task * task)587 xprt_rdma_free(struct rpc_task *task) 588 { 589 struct rpc_rqst *rqst = task->tk_rqstp; 590 struct rpcrdma_req *req = rpcr_to_rdmar(rqst); 591 592 if (unlikely(!list_empty(&req->rl_registered))) { 593 trace_xprtrdma_mrs_zap(task); 594 frwr_unmap_sync(rpcx_to_rdmax(rqst->rq_xprt), req); 595 } 596 597 /* XXX: If the RPC is completing because of a signal and 598 * not because a reply was received, we ought to ensure 599 * that the Send completion has fired, so that memory 600 * involved with the Send is not still visible to the NIC. 601 */ 602 } 603 604 /** 605 * xprt_rdma_send_request - marshal and send an RPC request 606 * @rqst: RPC message in rq_snd_buf 607 * 608 * Caller holds the transport's write lock. 609 * 610 * Returns: 611 * %0 if the RPC message has been sent 612 * %-ENOTCONN if the caller should reconnect and call again 613 * %-EAGAIN if the caller should call again 614 * %-ENOBUFS if the caller should call again after a delay 615 * %-EMSGSIZE if encoding ran out of buffer space. The request 616 * was not sent. Do not try to send this message again. 617 * %-EIO if an I/O error occurred. The request was not sent. 618 * Do not try to send this message again. 619 */ 620 static int xprt_rdma_send_request(struct rpc_rqst * rqst)621 xprt_rdma_send_request(struct rpc_rqst *rqst) 622 { 623 struct rpc_xprt *xprt = rqst->rq_xprt; 624 struct rpcrdma_req *req = rpcr_to_rdmar(rqst); 625 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 626 int rc = 0; 627 628 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 629 if (unlikely(!rqst->rq_buffer)) 630 return xprt_rdma_bc_send_reply(rqst); 631 #endif /* CONFIG_SUNRPC_BACKCHANNEL */ 632 633 if (!xprt_connected(xprt)) 634 return -ENOTCONN; 635 636 if (!xprt_request_get_cong(xprt, rqst)) 637 return -EBADSLT; 638 639 rc = rpcrdma_marshal_req(r_xprt, rqst); 640 if (rc < 0) 641 goto failed_marshal; 642 643 /* Must suppress retransmit to maintain credits */ 644 if (rqst->rq_connect_cookie == xprt->connect_cookie) 645 goto drop_connection; 646 rqst->rq_xtime = ktime_get(); 647 648 if (frwr_send(r_xprt, req)) 649 goto drop_connection; 650 651 rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len; 652 653 /* An RPC with no reply will throw off credit accounting, 654 * so drop the connection to reset the credit grant. 655 */ 656 if (!rpc_reply_expected(rqst->rq_task)) 657 goto drop_connection; 658 return 0; 659 660 failed_marshal: 661 if (rc != -ENOTCONN) 662 return rc; 663 drop_connection: 664 xprt_rdma_close(xprt); 665 return -ENOTCONN; 666 } 667 xprt_rdma_print_stats(struct rpc_xprt * xprt,struct seq_file * seq)668 void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 669 { 670 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 671 long idle_time = 0; 672 673 if (xprt_connected(xprt)) 674 idle_time = (long)(jiffies - xprt->last_used) / HZ; 675 676 seq_puts(seq, "\txprt:\trdma "); 677 seq_printf(seq, "%u %lu %lu %lu %ld %lu %lu %lu %llu %llu ", 678 0, /* need a local port? */ 679 xprt->stat.bind_count, 680 xprt->stat.connect_count, 681 xprt->stat.connect_time / HZ, 682 idle_time, 683 xprt->stat.sends, 684 xprt->stat.recvs, 685 xprt->stat.bad_xids, 686 xprt->stat.req_u, 687 xprt->stat.bklog_u); 688 seq_printf(seq, "%lu %lu %lu %llu %llu %llu %llu %lu %lu %lu %lu ", 689 r_xprt->rx_stats.read_chunk_count, 690 r_xprt->rx_stats.write_chunk_count, 691 r_xprt->rx_stats.reply_chunk_count, 692 r_xprt->rx_stats.total_rdma_request, 693 r_xprt->rx_stats.total_rdma_reply, 694 r_xprt->rx_stats.pullup_copy_count, 695 r_xprt->rx_stats.fixup_copy_count, 696 r_xprt->rx_stats.hardway_register_count, 697 r_xprt->rx_stats.failed_marshal_count, 698 r_xprt->rx_stats.bad_reply_count, 699 r_xprt->rx_stats.nomsg_call_count); 700 seq_printf(seq, "%lu %lu %lu %lu %lu %lu\n", 701 r_xprt->rx_stats.mrs_recycled, 702 r_xprt->rx_stats.mrs_orphaned, 703 r_xprt->rx_stats.mrs_allocated, 704 r_xprt->rx_stats.local_inv_needed, 705 r_xprt->rx_stats.empty_sendctx_q, 706 r_xprt->rx_stats.reply_waits_for_send); 707 } 708 709 static int xprt_rdma_enable_swap(struct rpc_xprt * xprt)710 xprt_rdma_enable_swap(struct rpc_xprt *xprt) 711 { 712 return 0; 713 } 714 715 static void xprt_rdma_disable_swap(struct rpc_xprt * xprt)716 xprt_rdma_disable_swap(struct rpc_xprt *xprt) 717 { 718 } 719 720 /* 721 * Plumbing for rpc transport switch and kernel module 722 */ 723 724 static const struct rpc_xprt_ops xprt_rdma_procs = { 725 .reserve_xprt = xprt_reserve_xprt_cong, 726 .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */ 727 .alloc_slot = xprt_rdma_alloc_slot, 728 .free_slot = xprt_rdma_free_slot, 729 .release_request = xprt_release_rqst_cong, /* ditto */ 730 .wait_for_reply_request = xprt_wait_for_reply_request_def, /* ditto */ 731 .timer = xprt_rdma_timer, 732 .rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */ 733 .set_port = xprt_rdma_set_port, 734 .connect = xprt_rdma_connect, 735 .buf_alloc = xprt_rdma_allocate, 736 .buf_free = xprt_rdma_free, 737 .send_request = xprt_rdma_send_request, 738 .close = xprt_rdma_close, 739 .destroy = xprt_rdma_destroy, 740 .set_connect_timeout = xprt_rdma_set_connect_timeout, 741 .print_stats = xprt_rdma_print_stats, 742 .enable_swap = xprt_rdma_enable_swap, 743 .disable_swap = xprt_rdma_disable_swap, 744 .inject_disconnect = xprt_rdma_inject_disconnect, 745 #if defined(CONFIG_SUNRPC_BACKCHANNEL) 746 .bc_setup = xprt_rdma_bc_setup, 747 .bc_maxpayload = xprt_rdma_bc_maxpayload, 748 .bc_num_slots = xprt_rdma_bc_max_slots, 749 .bc_free_rqst = xprt_rdma_bc_free_rqst, 750 .bc_destroy = xprt_rdma_bc_destroy, 751 #endif 752 }; 753 754 static struct xprt_class xprt_rdma = { 755 .list = LIST_HEAD_INIT(xprt_rdma.list), 756 .name = "rdma", 757 .owner = THIS_MODULE, 758 .ident = XPRT_TRANSPORT_RDMA, 759 .setup = xprt_setup_rdma, 760 .netid = { "rdma", "rdma6", "" }, 761 }; 762 xprt_rdma_cleanup(void)763 void xprt_rdma_cleanup(void) 764 { 765 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 766 if (sunrpc_table_header) { 767 unregister_sysctl_table(sunrpc_table_header); 768 sunrpc_table_header = NULL; 769 } 770 #endif 771 772 xprt_unregister_transport(&xprt_rdma); 773 xprt_unregister_transport(&xprt_rdma_bc); 774 } 775 xprt_rdma_init(void)776 int xprt_rdma_init(void) 777 { 778 int rc; 779 780 rc = xprt_register_transport(&xprt_rdma); 781 if (rc) 782 return rc; 783 784 rc = xprt_register_transport(&xprt_rdma_bc); 785 if (rc) { 786 xprt_unregister_transport(&xprt_rdma); 787 return rc; 788 } 789 790 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 791 if (!sunrpc_table_header) 792 sunrpc_table_header = register_sysctl("sunrpc", xr_tunables_table); 793 #endif 794 return 0; 795 } 796