1 /* 2 * Copyright (c) 2003-2007 Network Appliance, Inc. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the BSD-type 8 * license below: 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 14 * Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 17 * Redistributions in binary form must reproduce the above 18 * copyright notice, this list of conditions and the following 19 * disclaimer in the documentation and/or other materials provided 20 * with the distribution. 21 * 22 * Neither the name of the Network Appliance, Inc. nor the names of 23 * its contributors may be used to endorse or promote products 24 * derived from this software without specific prior written 25 * permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 30 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 31 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 32 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 33 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 34 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 35 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 36 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 37 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * transport.c 42 * 43 * This file contains the top-level implementation of an RPC RDMA 44 * transport. 45 * 46 * Naming convention: functions beginning with xprt_ are part of the 47 * transport switch. All others are RPC RDMA internal. 48 */ 49 50 #include <linux/module.h> 51 #include <linux/slab.h> 52 #include <linux/seq_file.h> 53 #include <linux/sunrpc/addr.h> 54 55 #include "xprt_rdma.h" 56 57 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 58 # define RPCDBG_FACILITY RPCDBG_TRANS 59 #endif 60 61 /* 62 * tunables 63 */ 64 65 static unsigned int xprt_rdma_slot_table_entries = RPCRDMA_DEF_SLOT_TABLE; 66 static unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE; 67 static unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE; 68 static unsigned int xprt_rdma_inline_write_padding; 69 static unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRMR; 70 int xprt_rdma_pad_optimize = 1; 71 72 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 73 74 static unsigned int min_slot_table_size = RPCRDMA_MIN_SLOT_TABLE; 75 static unsigned int max_slot_table_size = RPCRDMA_MAX_SLOT_TABLE; 76 static unsigned int zero; 77 static unsigned int max_padding = PAGE_SIZE; 78 static unsigned int min_memreg = RPCRDMA_BOUNCEBUFFERS; 79 static unsigned int max_memreg = RPCRDMA_LAST - 1; 80 81 static struct ctl_table_header *sunrpc_table_header; 82 83 static struct ctl_table xr_tunables_table[] = { 84 { 85 .procname = "rdma_slot_table_entries", 86 .data = &xprt_rdma_slot_table_entries, 87 .maxlen = sizeof(unsigned int), 88 .mode = 0644, 89 .proc_handler = proc_dointvec_minmax, 90 .extra1 = &min_slot_table_size, 91 .extra2 = &max_slot_table_size 92 }, 93 { 94 .procname = "rdma_max_inline_read", 95 .data = &xprt_rdma_max_inline_read, 96 .maxlen = sizeof(unsigned int), 97 .mode = 0644, 98 .proc_handler = proc_dointvec, 99 }, 100 { 101 .procname = "rdma_max_inline_write", 102 .data = &xprt_rdma_max_inline_write, 103 .maxlen = sizeof(unsigned int), 104 .mode = 0644, 105 .proc_handler = proc_dointvec, 106 }, 107 { 108 .procname = "rdma_inline_write_padding", 109 .data = &xprt_rdma_inline_write_padding, 110 .maxlen = sizeof(unsigned int), 111 .mode = 0644, 112 .proc_handler = proc_dointvec_minmax, 113 .extra1 = &zero, 114 .extra2 = &max_padding, 115 }, 116 { 117 .procname = "rdma_memreg_strategy", 118 .data = &xprt_rdma_memreg_strategy, 119 .maxlen = sizeof(unsigned int), 120 .mode = 0644, 121 .proc_handler = proc_dointvec_minmax, 122 .extra1 = &min_memreg, 123 .extra2 = &max_memreg, 124 }, 125 { 126 .procname = "rdma_pad_optimize", 127 .data = &xprt_rdma_pad_optimize, 128 .maxlen = sizeof(unsigned int), 129 .mode = 0644, 130 .proc_handler = proc_dointvec, 131 }, 132 { }, 133 }; 134 135 static struct ctl_table sunrpc_table[] = { 136 { 137 .procname = "sunrpc", 138 .mode = 0555, 139 .child = xr_tunables_table 140 }, 141 { }, 142 }; 143 144 #endif 145 146 #define RPCRDMA_BIND_TO (60U * HZ) 147 #define RPCRDMA_INIT_REEST_TO (5U * HZ) 148 #define RPCRDMA_MAX_REEST_TO (30U * HZ) 149 #define RPCRDMA_IDLE_DISC_TO (5U * 60 * HZ) 150 151 static struct rpc_xprt_ops xprt_rdma_procs; /* forward reference */ 152 153 static void 154 xprt_rdma_format_addresses4(struct rpc_xprt *xprt, struct sockaddr *sap) 155 { 156 struct sockaddr_in *sin = (struct sockaddr_in *)sap; 157 char buf[20]; 158 159 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr)); 160 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 161 162 xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA; 163 } 164 165 static void 166 xprt_rdma_format_addresses6(struct rpc_xprt *xprt, struct sockaddr *sap) 167 { 168 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; 169 char buf[40]; 170 171 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr); 172 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL); 173 174 xprt->address_strings[RPC_DISPLAY_NETID] = RPCBIND_NETID_RDMA6; 175 } 176 177 static void 178 xprt_rdma_format_addresses(struct rpc_xprt *xprt) 179 { 180 struct sockaddr *sap = (struct sockaddr *) 181 &rpcx_to_rdmad(xprt).addr; 182 char buf[128]; 183 184 switch (sap->sa_family) { 185 case AF_INET: 186 xprt_rdma_format_addresses4(xprt, sap); 187 break; 188 case AF_INET6: 189 xprt_rdma_format_addresses6(xprt, sap); 190 break; 191 default: 192 pr_err("rpcrdma: Unrecognized address family\n"); 193 return; 194 } 195 196 (void)rpc_ntop(sap, buf, sizeof(buf)); 197 xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL); 198 199 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap)); 200 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL); 201 202 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap)); 203 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL); 204 205 xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma"; 206 } 207 208 static void 209 xprt_rdma_free_addresses(struct rpc_xprt *xprt) 210 { 211 unsigned int i; 212 213 for (i = 0; i < RPC_DISPLAY_MAX; i++) 214 switch (i) { 215 case RPC_DISPLAY_PROTO: 216 case RPC_DISPLAY_NETID: 217 continue; 218 default: 219 kfree(xprt->address_strings[i]); 220 } 221 } 222 223 static void 224 xprt_rdma_connect_worker(struct work_struct *work) 225 { 226 struct rpcrdma_xprt *r_xprt = container_of(work, struct rpcrdma_xprt, 227 rx_connect_worker.work); 228 struct rpc_xprt *xprt = &r_xprt->rx_xprt; 229 int rc = 0; 230 231 xprt_clear_connected(xprt); 232 233 dprintk("RPC: %s: %sconnect\n", __func__, 234 r_xprt->rx_ep.rep_connected != 0 ? "re" : ""); 235 rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia); 236 if (rc) 237 xprt_wake_pending_tasks(xprt, rc); 238 239 dprintk("RPC: %s: exit\n", __func__); 240 xprt_clear_connecting(xprt); 241 } 242 243 /* 244 * xprt_rdma_destroy 245 * 246 * Destroy the xprt. 247 * Free all memory associated with the object, including its own. 248 * NOTE: none of the *destroy methods free memory for their top-level 249 * objects, even though they may have allocated it (they do free 250 * private memory). It's up to the caller to handle it. In this 251 * case (RDMA transport), all structure memory is inlined with the 252 * struct rpcrdma_xprt. 253 */ 254 static void 255 xprt_rdma_destroy(struct rpc_xprt *xprt) 256 { 257 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 258 259 dprintk("RPC: %s: called\n", __func__); 260 261 cancel_delayed_work_sync(&r_xprt->rx_connect_worker); 262 263 xprt_clear_connected(xprt); 264 265 rpcrdma_buffer_destroy(&r_xprt->rx_buf); 266 rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia); 267 rpcrdma_ia_close(&r_xprt->rx_ia); 268 269 xprt_rdma_free_addresses(xprt); 270 271 xprt_free(xprt); 272 273 dprintk("RPC: %s: returning\n", __func__); 274 275 module_put(THIS_MODULE); 276 } 277 278 static const struct rpc_timeout xprt_rdma_default_timeout = { 279 .to_initval = 60 * HZ, 280 .to_maxval = 60 * HZ, 281 }; 282 283 /** 284 * xprt_setup_rdma - Set up transport to use RDMA 285 * 286 * @args: rpc transport arguments 287 */ 288 static struct rpc_xprt * 289 xprt_setup_rdma(struct xprt_create *args) 290 { 291 struct rpcrdma_create_data_internal cdata; 292 struct rpc_xprt *xprt; 293 struct rpcrdma_xprt *new_xprt; 294 struct rpcrdma_ep *new_ep; 295 struct sockaddr_in *sin; 296 int rc; 297 298 if (args->addrlen > sizeof(xprt->addr)) { 299 dprintk("RPC: %s: address too large\n", __func__); 300 return ERR_PTR(-EBADF); 301 } 302 303 xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt), 304 xprt_rdma_slot_table_entries, 305 xprt_rdma_slot_table_entries); 306 if (xprt == NULL) { 307 dprintk("RPC: %s: couldn't allocate rpcrdma_xprt\n", 308 __func__); 309 return ERR_PTR(-ENOMEM); 310 } 311 312 /* 60 second timeout, no retries */ 313 xprt->timeout = &xprt_rdma_default_timeout; 314 xprt->bind_timeout = RPCRDMA_BIND_TO; 315 xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO; 316 xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO; 317 318 xprt->resvport = 0; /* privileged port not needed */ 319 xprt->tsh_size = 0; /* RPC-RDMA handles framing */ 320 xprt->ops = &xprt_rdma_procs; 321 322 /* 323 * Set up RDMA-specific connect data. 324 */ 325 326 /* Put server RDMA address in local cdata */ 327 memcpy(&cdata.addr, args->dstaddr, args->addrlen); 328 329 /* Ensure xprt->addr holds valid server TCP (not RDMA) 330 * address, for any side protocols which peek at it */ 331 xprt->prot = IPPROTO_TCP; 332 xprt->addrlen = args->addrlen; 333 memcpy(&xprt->addr, &cdata.addr, xprt->addrlen); 334 335 sin = (struct sockaddr_in *)&cdata.addr; 336 if (ntohs(sin->sin_port) != 0) 337 xprt_set_bound(xprt); 338 339 dprintk("RPC: %s: %pI4:%u\n", 340 __func__, &sin->sin_addr.s_addr, ntohs(sin->sin_port)); 341 342 /* Set max requests */ 343 cdata.max_requests = xprt->max_reqs; 344 345 /* Set some length limits */ 346 cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */ 347 cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */ 348 349 cdata.inline_wsize = xprt_rdma_max_inline_write; 350 if (cdata.inline_wsize > cdata.wsize) 351 cdata.inline_wsize = cdata.wsize; 352 353 cdata.inline_rsize = xprt_rdma_max_inline_read; 354 if (cdata.inline_rsize > cdata.rsize) 355 cdata.inline_rsize = cdata.rsize; 356 357 cdata.padding = xprt_rdma_inline_write_padding; 358 359 /* 360 * Create new transport instance, which includes initialized 361 * o ia 362 * o endpoint 363 * o buffers 364 */ 365 366 new_xprt = rpcx_to_rdmax(xprt); 367 368 rc = rpcrdma_ia_open(new_xprt, (struct sockaddr *) &cdata.addr, 369 xprt_rdma_memreg_strategy); 370 if (rc) 371 goto out1; 372 373 /* 374 * initialize and create ep 375 */ 376 new_xprt->rx_data = cdata; 377 new_ep = &new_xprt->rx_ep; 378 new_ep->rep_remote_addr = cdata.addr; 379 380 rc = rpcrdma_ep_create(&new_xprt->rx_ep, 381 &new_xprt->rx_ia, &new_xprt->rx_data); 382 if (rc) 383 goto out2; 384 385 /* 386 * Allocate pre-registered send and receive buffers for headers and 387 * any inline data. Also specify any padding which will be provided 388 * from a preregistered zero buffer. 389 */ 390 rc = rpcrdma_buffer_create(new_xprt); 391 if (rc) 392 goto out3; 393 394 /* 395 * Register a callback for connection events. This is necessary because 396 * connection loss notification is async. We also catch connection loss 397 * when reaping receives. 398 */ 399 INIT_DELAYED_WORK(&new_xprt->rx_connect_worker, 400 xprt_rdma_connect_worker); 401 402 xprt_rdma_format_addresses(xprt); 403 xprt->max_payload = new_xprt->rx_ia.ri_ops->ro_maxpages(new_xprt); 404 if (xprt->max_payload == 0) 405 goto out4; 406 xprt->max_payload <<= PAGE_SHIFT; 407 dprintk("RPC: %s: transport data payload maximum: %zu bytes\n", 408 __func__, xprt->max_payload); 409 410 if (!try_module_get(THIS_MODULE)) 411 goto out4; 412 413 return xprt; 414 415 out4: 416 xprt_rdma_free_addresses(xprt); 417 rc = -EINVAL; 418 out3: 419 rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia); 420 out2: 421 rpcrdma_ia_close(&new_xprt->rx_ia); 422 out1: 423 xprt_free(xprt); 424 return ERR_PTR(rc); 425 } 426 427 /* 428 * Close a connection, during shutdown or timeout/reconnect 429 */ 430 static void 431 xprt_rdma_close(struct rpc_xprt *xprt) 432 { 433 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 434 435 dprintk("RPC: %s: closing\n", __func__); 436 if (r_xprt->rx_ep.rep_connected > 0) 437 xprt->reestablish_timeout = 0; 438 xprt_disconnect_done(xprt); 439 rpcrdma_ep_disconnect(&r_xprt->rx_ep, &r_xprt->rx_ia); 440 } 441 442 static void 443 xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port) 444 { 445 struct sockaddr_in *sap; 446 447 sap = (struct sockaddr_in *)&xprt->addr; 448 sap->sin_port = htons(port); 449 sap = (struct sockaddr_in *)&rpcx_to_rdmad(xprt).addr; 450 sap->sin_port = htons(port); 451 dprintk("RPC: %s: %u\n", __func__, port); 452 } 453 454 static void 455 xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task) 456 { 457 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 458 459 if (r_xprt->rx_ep.rep_connected != 0) { 460 /* Reconnect */ 461 schedule_delayed_work(&r_xprt->rx_connect_worker, 462 xprt->reestablish_timeout); 463 xprt->reestablish_timeout <<= 1; 464 if (xprt->reestablish_timeout > RPCRDMA_MAX_REEST_TO) 465 xprt->reestablish_timeout = RPCRDMA_MAX_REEST_TO; 466 else if (xprt->reestablish_timeout < RPCRDMA_INIT_REEST_TO) 467 xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO; 468 } else { 469 schedule_delayed_work(&r_xprt->rx_connect_worker, 0); 470 if (!RPC_IS_ASYNC(task)) 471 flush_delayed_work(&r_xprt->rx_connect_worker); 472 } 473 } 474 475 /* 476 * The RDMA allocate/free functions need the task structure as a place 477 * to hide the struct rpcrdma_req, which is necessary for the actual send/recv 478 * sequence. 479 * 480 * The RPC layer allocates both send and receive buffers in the same call 481 * (rq_send_buf and rq_rcv_buf are both part of a single contiguous buffer). 482 * We may register rq_rcv_buf when using reply chunks. 483 */ 484 static void * 485 xprt_rdma_allocate(struct rpc_task *task, size_t size) 486 { 487 struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt; 488 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 489 struct rpcrdma_regbuf *rb; 490 struct rpcrdma_req *req; 491 size_t min_size; 492 gfp_t flags; 493 494 req = rpcrdma_buffer_get(&r_xprt->rx_buf); 495 if (req == NULL) 496 return NULL; 497 498 flags = GFP_NOIO | __GFP_NOWARN; 499 if (RPC_IS_SWAPPER(task)) 500 flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN; 501 502 if (req->rl_rdmabuf == NULL) 503 goto out_rdmabuf; 504 if (req->rl_sendbuf == NULL) 505 goto out_sendbuf; 506 if (size > req->rl_sendbuf->rg_size) 507 goto out_sendbuf; 508 509 out: 510 dprintk("RPC: %s: size %zd, request 0x%p\n", __func__, size, req); 511 req->rl_connect_cookie = 0; /* our reserved value */ 512 return req->rl_sendbuf->rg_base; 513 514 out_rdmabuf: 515 min_size = RPCRDMA_INLINE_WRITE_THRESHOLD(task->tk_rqstp); 516 rb = rpcrdma_alloc_regbuf(&r_xprt->rx_ia, min_size, flags); 517 if (IS_ERR(rb)) 518 goto out_fail; 519 req->rl_rdmabuf = rb; 520 521 out_sendbuf: 522 /* XDR encoding and RPC/RDMA marshaling of this request has not 523 * yet occurred. Thus a lower bound is needed to prevent buffer 524 * overrun during marshaling. 525 * 526 * RPC/RDMA marshaling may choose to send payload bearing ops 527 * inline, if the result is smaller than the inline threshold. 528 * The value of the "size" argument accounts for header 529 * requirements but not for the payload in these cases. 530 * 531 * Likewise, allocate enough space to receive a reply up to the 532 * size of the inline threshold. 533 * 534 * It's unlikely that both the send header and the received 535 * reply will be large, but slush is provided here to allow 536 * flexibility when marshaling. 537 */ 538 min_size = RPCRDMA_INLINE_READ_THRESHOLD(task->tk_rqstp); 539 min_size += RPCRDMA_INLINE_WRITE_THRESHOLD(task->tk_rqstp); 540 if (size < min_size) 541 size = min_size; 542 543 rb = rpcrdma_alloc_regbuf(&r_xprt->rx_ia, size, flags); 544 if (IS_ERR(rb)) 545 goto out_fail; 546 rb->rg_owner = req; 547 548 r_xprt->rx_stats.hardway_register_count += size; 549 rpcrdma_free_regbuf(&r_xprt->rx_ia, req->rl_sendbuf); 550 req->rl_sendbuf = rb; 551 goto out; 552 553 out_fail: 554 rpcrdma_buffer_put(req); 555 r_xprt->rx_stats.failed_marshal_count++; 556 return NULL; 557 } 558 559 /* 560 * This function returns all RDMA resources to the pool. 561 */ 562 static void 563 xprt_rdma_free(void *buffer) 564 { 565 struct rpcrdma_req *req; 566 struct rpcrdma_xprt *r_xprt; 567 struct rpcrdma_regbuf *rb; 568 int i; 569 570 if (buffer == NULL) 571 return; 572 573 rb = container_of(buffer, struct rpcrdma_regbuf, rg_base[0]); 574 req = rb->rg_owner; 575 r_xprt = container_of(req->rl_buffer, struct rpcrdma_xprt, rx_buf); 576 577 dprintk("RPC: %s: called on 0x%p\n", __func__, req->rl_reply); 578 579 for (i = 0; req->rl_nchunks;) { 580 --req->rl_nchunks; 581 i += r_xprt->rx_ia.ri_ops->ro_unmap(r_xprt, 582 &req->rl_segments[i]); 583 } 584 585 rpcrdma_buffer_put(req); 586 } 587 588 /* 589 * send_request invokes the meat of RPC RDMA. It must do the following: 590 * 1. Marshal the RPC request into an RPC RDMA request, which means 591 * putting a header in front of data, and creating IOVs for RDMA 592 * from those in the request. 593 * 2. In marshaling, detect opportunities for RDMA, and use them. 594 * 3. Post a recv message to set up asynch completion, then send 595 * the request (rpcrdma_ep_post). 596 * 4. No partial sends are possible in the RPC-RDMA protocol (as in UDP). 597 */ 598 599 static int 600 xprt_rdma_send_request(struct rpc_task *task) 601 { 602 struct rpc_rqst *rqst = task->tk_rqstp; 603 struct rpc_xprt *xprt = rqst->rq_xprt; 604 struct rpcrdma_req *req = rpcr_to_rdmar(rqst); 605 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 606 int rc = 0; 607 608 rc = rpcrdma_marshal_req(rqst); 609 if (rc < 0) 610 goto failed_marshal; 611 612 if (req->rl_reply == NULL) /* e.g. reconnection */ 613 rpcrdma_recv_buffer_get(req); 614 615 if (req->rl_reply) { 616 req->rl_reply->rr_func = rpcrdma_reply_handler; 617 /* this need only be done once, but... */ 618 req->rl_reply->rr_xprt = xprt; 619 } 620 621 /* Must suppress retransmit to maintain credits */ 622 if (req->rl_connect_cookie == xprt->connect_cookie) 623 goto drop_connection; 624 req->rl_connect_cookie = xprt->connect_cookie; 625 626 if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req)) 627 goto drop_connection; 628 629 rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len; 630 rqst->rq_bytes_sent = 0; 631 return 0; 632 633 failed_marshal: 634 r_xprt->rx_stats.failed_marshal_count++; 635 dprintk("RPC: %s: rpcrdma_marshal_req failed, status %i\n", 636 __func__, rc); 637 if (rc == -EIO) 638 return -EIO; 639 drop_connection: 640 xprt_disconnect_done(xprt); 641 return -ENOTCONN; /* implies disconnect */ 642 } 643 644 static void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 645 { 646 struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); 647 long idle_time = 0; 648 649 if (xprt_connected(xprt)) 650 idle_time = (long)(jiffies - xprt->last_used) / HZ; 651 652 seq_printf(seq, 653 "\txprt:\trdma %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu " 654 "%lu %lu %lu %Lu %Lu %Lu %Lu %lu %lu %lu\n", 655 656 0, /* need a local port? */ 657 xprt->stat.bind_count, 658 xprt->stat.connect_count, 659 xprt->stat.connect_time, 660 idle_time, 661 xprt->stat.sends, 662 xprt->stat.recvs, 663 xprt->stat.bad_xids, 664 xprt->stat.req_u, 665 xprt->stat.bklog_u, 666 667 r_xprt->rx_stats.read_chunk_count, 668 r_xprt->rx_stats.write_chunk_count, 669 r_xprt->rx_stats.reply_chunk_count, 670 r_xprt->rx_stats.total_rdma_request, 671 r_xprt->rx_stats.total_rdma_reply, 672 r_xprt->rx_stats.pullup_copy_count, 673 r_xprt->rx_stats.fixup_copy_count, 674 r_xprt->rx_stats.hardway_register_count, 675 r_xprt->rx_stats.failed_marshal_count, 676 r_xprt->rx_stats.bad_reply_count); 677 } 678 679 /* 680 * Plumbing for rpc transport switch and kernel module 681 */ 682 683 static struct rpc_xprt_ops xprt_rdma_procs = { 684 .reserve_xprt = xprt_reserve_xprt_cong, 685 .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */ 686 .alloc_slot = xprt_alloc_slot, 687 .release_request = xprt_release_rqst_cong, /* ditto */ 688 .set_retrans_timeout = xprt_set_retrans_timeout_def, /* ditto */ 689 .rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */ 690 .set_port = xprt_rdma_set_port, 691 .connect = xprt_rdma_connect, 692 .buf_alloc = xprt_rdma_allocate, 693 .buf_free = xprt_rdma_free, 694 .send_request = xprt_rdma_send_request, 695 .close = xprt_rdma_close, 696 .destroy = xprt_rdma_destroy, 697 .print_stats = xprt_rdma_print_stats 698 }; 699 700 static struct xprt_class xprt_rdma = { 701 .list = LIST_HEAD_INIT(xprt_rdma.list), 702 .name = "rdma", 703 .owner = THIS_MODULE, 704 .ident = XPRT_TRANSPORT_RDMA, 705 .setup = xprt_setup_rdma, 706 }; 707 708 void xprt_rdma_cleanup(void) 709 { 710 int rc; 711 712 dprintk("RPCRDMA Module Removed, deregister RPC RDMA transport\n"); 713 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 714 if (sunrpc_table_header) { 715 unregister_sysctl_table(sunrpc_table_header); 716 sunrpc_table_header = NULL; 717 } 718 #endif 719 rc = xprt_unregister_transport(&xprt_rdma); 720 if (rc) 721 dprintk("RPC: %s: xprt_unregister returned %i\n", 722 __func__, rc); 723 } 724 725 int xprt_rdma_init(void) 726 { 727 int rc; 728 729 rc = xprt_register_transport(&xprt_rdma); 730 731 if (rc) 732 return rc; 733 734 dprintk("RPCRDMA Module Init, register RPC RDMA transport\n"); 735 736 dprintk("Defaults:\n"); 737 dprintk("\tSlots %d\n" 738 "\tMaxInlineRead %d\n\tMaxInlineWrite %d\n", 739 xprt_rdma_slot_table_entries, 740 xprt_rdma_max_inline_read, xprt_rdma_max_inline_write); 741 dprintk("\tPadding %d\n\tMemreg %d\n", 742 xprt_rdma_inline_write_padding, xprt_rdma_memreg_strategy); 743 744 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) 745 if (!sunrpc_table_header) 746 sunrpc_table_header = register_sysctl_table(sunrpc_table); 747 #endif 748 return 0; 749 } 750