net/sunrpc/xprtrdma/transport.c

   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 static void
 244 xprt_rdma_inject_disconnect(struct rpc_xprt *xprt)
 245 {
 246         struct rpcrdma_xprt *r_xprt = container_of(xprt, struct rpcrdma_xprt,
 247                                                    rx_xprt);
 248
 249         pr_info("rpcrdma: injecting transport disconnect on xprt=%p\n", xprt);
 250         rdma_disconnect(r_xprt->rx_ia.ri_id);
 251 }
 252
 253 /*
 254  * xprt_rdma_destroy
 255  *
 256  * Destroy the xprt.
 257  * Free all memory associated with the object, including its own.
 258  * NOTE: none of the *destroy methods free memory for their top-level
 259  * objects, even though they may have allocated it (they do free
 260  * private memory). It's up to the caller to handle it. In this
 261  * case (RDMA transport), all structure memory is inlined with the
 262  * struct rpcrdma_xprt.
 263  */
 264 static void
 265 xprt_rdma_destroy(struct rpc_xprt *xprt)
 266 {
 267         struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
 268
 269         dprintk("RPC:       %s: called\n", __func__);
 270
 271         cancel_delayed_work_sync(&r_xprt->rx_connect_worker);
 272
 273         xprt_clear_connected(xprt);
 274
 275         rpcrdma_buffer_destroy(&r_xprt->rx_buf);
 276         rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia);
 277         rpcrdma_ia_close(&r_xprt->rx_ia);
 278
 279         xprt_rdma_free_addresses(xprt);
 280
 281         xprt_free(xprt);
 282
 283         dprintk("RPC:       %s: returning\n", __func__);
 284
 285         module_put(THIS_MODULE);
 286 }
 287
 288 static const struct rpc_timeout xprt_rdma_default_timeout = {
 289         .to_initval = 60 * HZ,
 290         .to_maxval = 60 * HZ,
 291 };
 292
 293 /**
 294  * xprt_setup_rdma - Set up transport to use RDMA
 295  *
 296  * @args: rpc transport arguments
 297  */
 298 static struct rpc_xprt *
 299 xprt_setup_rdma(struct xprt_create *args)
 300 {
 301         struct rpcrdma_create_data_internal cdata;
 302         struct rpc_xprt *xprt;
 303         struct rpcrdma_xprt *new_xprt;
 304         struct rpcrdma_ep *new_ep;
 305         struct sockaddr_in *sin;
 306         int rc;
 307
 308         if (args->addrlen > sizeof(xprt->addr)) {
 309                 dprintk("RPC:       %s: address too large\n", __func__);
 310                 return ERR_PTR(-EBADF);
 311         }
 312
 313         xprt = xprt_alloc(args->net, sizeof(struct rpcrdma_xprt),
 314                         xprt_rdma_slot_table_entries,
 315                         xprt_rdma_slot_table_entries);
 316         if (xprt == NULL) {
 317                 dprintk("RPC:       %s: couldn't allocate rpcrdma_xprt\n",
 318                         __func__);
 319                 return ERR_PTR(-ENOMEM);
 320         }
 321
 322         /* 60 second timeout, no retries */
 323         xprt->timeout = &xprt_rdma_default_timeout;
 324         xprt->bind_timeout = RPCRDMA_BIND_TO;
 325         xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
 326         xprt->idle_timeout = RPCRDMA_IDLE_DISC_TO;
 327
 328         xprt->resvport = 0;             /* privileged port not needed */
 329         xprt->tsh_size = 0;             /* RPC-RDMA handles framing */
 330         xprt->ops = &xprt_rdma_procs;
 331
 332         /*
 333          * Set up RDMA-specific connect data.
 334          */
 335
 336         /* Put server RDMA address in local cdata */
 337         memcpy(&cdata.addr, args->dstaddr, args->addrlen);
 338
 339         /* Ensure xprt->addr holds valid server TCP (not RDMA)
 340          * address, for any side protocols which peek at it */
 341         xprt->prot = IPPROTO_TCP;
 342         xprt->addrlen = args->addrlen;
 343         memcpy(&xprt->addr, &cdata.addr, xprt->addrlen);
 344
 345         sin = (struct sockaddr_in *)&cdata.addr;
 346         if (ntohs(sin->sin_port) != 0)
 347                 xprt_set_bound(xprt);
 348
 349         dprintk("RPC:       %s: %pI4:%u\n",
 350                 __func__, &sin->sin_addr.s_addr, ntohs(sin->sin_port));
 351
 352         /* Set max requests */
 353         cdata.max_requests = xprt->max_reqs;
 354
 355         /* Set some length limits */
 356         cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */
 357         cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */
 358
 359         cdata.inline_wsize = xprt_rdma_max_inline_write;
 360         if (cdata.inline_wsize > cdata.wsize)
 361                 cdata.inline_wsize = cdata.wsize;
 362
 363         cdata.inline_rsize = xprt_rdma_max_inline_read;
 364         if (cdata.inline_rsize > cdata.rsize)
 365                 cdata.inline_rsize = cdata.rsize;
 366
 367         cdata.padding = xprt_rdma_inline_write_padding;
 368
 369         /*
 370          * Create new transport instance, which includes initialized
 371          *  o ia
 372          *  o endpoint
 373          *  o buffers
 374          */
 375
 376         new_xprt = rpcx_to_rdmax(xprt);
 377
 378         rc = rpcrdma_ia_open(new_xprt, (struct sockaddr *) &cdata.addr,
 379                                 xprt_rdma_memreg_strategy);
 380         if (rc)
 381                 goto out1;
 382
 383         /*
 384          * initialize and create ep
 385          */
 386         new_xprt->rx_data = cdata;
 387         new_ep = &new_xprt->rx_ep;
 388         new_ep->rep_remote_addr = cdata.addr;
 389
 390         rc = rpcrdma_ep_create(&new_xprt->rx_ep,
 391                                 &new_xprt->rx_ia, &new_xprt->rx_data);
 392         if (rc)
 393                 goto out2;
 394
 395         /*
 396          * Allocate pre-registered send and receive buffers for headers and
 397          * any inline data. Also specify any padding which will be provided
 398          * from a preregistered zero buffer.
 399          */
 400         rc = rpcrdma_buffer_create(new_xprt);
 401         if (rc)
 402                 goto out3;
 403
 404         /*
 405          * Register a callback for connection events. This is necessary because
 406          * connection loss notification is async. We also catch connection loss
 407          * when reaping receives.
 408          */
 409         INIT_DELAYED_WORK(&new_xprt->rx_connect_worker,
 410                           xprt_rdma_connect_worker);
 411
 412         xprt_rdma_format_addresses(xprt);
 413         xprt->max_payload = new_xprt->rx_ia.ri_ops->ro_maxpages(new_xprt);
 414         if (xprt->max_payload == 0)
 415                 goto out4;
 416         xprt->max_payload <<= PAGE_SHIFT;
 417         dprintk("RPC:       %s: transport data payload maximum: %zu bytes\n",
 418                 __func__, xprt->max_payload);
 419
 420         if (!try_module_get(THIS_MODULE))
 421                 goto out4;
 422
 423         return xprt;
 424
 425 out4:
 426         xprt_rdma_free_addresses(xprt);
 427         rc = -EINVAL;
 428 out3:
 429         rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia);
 430 out2:
 431         rpcrdma_ia_close(&new_xprt->rx_ia);
 432 out1:
 433         xprt_free(xprt);
 434         return ERR_PTR(rc);
 435 }
 436
 437 /*
 438  * Close a connection, during shutdown or timeout/reconnect
 439  */
 440 static void
 441 xprt_rdma_close(struct rpc_xprt *xprt)
 442 {
 443         struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
 444
 445         dprintk("RPC:       %s: closing\n", __func__);
 446         if (r_xprt->rx_ep.rep_connected > 0)
 447                 xprt->reestablish_timeout = 0;
 448         xprt_disconnect_done(xprt);
 449         rpcrdma_ep_disconnect(&r_xprt->rx_ep, &r_xprt->rx_ia);
 450 }
 451
 452 static void
 453 xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port)
 454 {
 455         struct sockaddr_in *sap;
 456
 457         sap = (struct sockaddr_in *)&xprt->addr;
 458         sap->sin_port = htons(port);
 459         sap = (struct sockaddr_in *)&rpcx_to_rdmad(xprt).addr;
 460         sap->sin_port = htons(port);
 461         dprintk("RPC:       %s: %u\n", __func__, port);
 462 }
 463
 464 static void
 465 xprt_rdma_connect(struct rpc_xprt *xprt, struct rpc_task *task)
 466 {
 467         struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
 468
 469         if (r_xprt->rx_ep.rep_connected != 0) {
 470                 /* Reconnect */
 471                 schedule_delayed_work(&r_xprt->rx_connect_worker,
 472                                       xprt->reestablish_timeout);
 473                 xprt->reestablish_timeout <<= 1;
 474                 if (xprt->reestablish_timeout > RPCRDMA_MAX_REEST_TO)
 475                         xprt->reestablish_timeout = RPCRDMA_MAX_REEST_TO;
 476                 else if (xprt->reestablish_timeout < RPCRDMA_INIT_REEST_TO)
 477                         xprt->reestablish_timeout = RPCRDMA_INIT_REEST_TO;
 478         } else {
 479                 schedule_delayed_work(&r_xprt->rx_connect_worker, 0);
 480                 if (!RPC_IS_ASYNC(task))
 481                         flush_delayed_work(&r_xprt->rx_connect_worker);
 482         }
 483 }
 484
 485 /*
 486  * The RDMA allocate/free functions need the task structure as a place
 487  * to hide the struct rpcrdma_req, which is necessary for the actual send/recv
 488  * sequence.
 489  *
 490  * The RPC layer allocates both send and receive buffers in the same call
 491  * (rq_send_buf and rq_rcv_buf are both part of a single contiguous buffer).
 492  * We may register rq_rcv_buf when using reply chunks.
 493  */
 494 static void *
 495 xprt_rdma_allocate(struct rpc_task *task, size_t size)
 496 {
 497         struct rpc_xprt *xprt = task->tk_rqstp->rq_xprt;
 498         struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
 499         struct rpcrdma_regbuf *rb;
 500         struct rpcrdma_req *req;
 501         size_t min_size;
 502         gfp_t flags;
 503
 504         req = rpcrdma_buffer_get(&r_xprt->rx_buf);
 505         if (req == NULL)
 506                 return NULL;
 507
 508         flags = GFP_NOIO | __GFP_NOWARN;
 509         if (RPC_IS_SWAPPER(task))
 510                 flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN;
 511
 512         if (req->rl_rdmabuf == NULL)
 513                 goto out_rdmabuf;
 514         if (req->rl_sendbuf == NULL)
 515                 goto out_sendbuf;
 516         if (size > req->rl_sendbuf->rg_size)
 517                 goto out_sendbuf;
 518
 519 out:
 520         dprintk("RPC:       %s: size %zd, request 0x%p\n", __func__, size, req);
 521         req->rl_connect_cookie = 0;     /* our reserved value */
 522         return req->rl_sendbuf->rg_base;
 523
 524 out_rdmabuf:
 525         min_size = RPCRDMA_INLINE_WRITE_THRESHOLD(task->tk_rqstp);
 526         rb = rpcrdma_alloc_regbuf(&r_xprt->rx_ia, min_size, flags);
 527         if (IS_ERR(rb))
 528                 goto out_fail;
 529         req->rl_rdmabuf = rb;
 530
 531 out_sendbuf:
 532         /* XDR encoding and RPC/RDMA marshaling of this request has not
 533          * yet occurred. Thus a lower bound is needed to prevent buffer
 534          * overrun during marshaling.
 535          *
 536          * RPC/RDMA marshaling may choose to send payload bearing ops
 537          * inline, if the result is smaller than the inline threshold.
 538          * The value of the "size" argument accounts for header
 539          * requirements but not for the payload in these cases.
 540          *
 541          * Likewise, allocate enough space to receive a reply up to the
 542          * size of the inline threshold.
 543          *
 544          * It's unlikely that both the send header and the received
 545          * reply will be large, but slush is provided here to allow
 546          * flexibility when marshaling.
 547          */
 548         min_size = RPCRDMA_INLINE_READ_THRESHOLD(task->tk_rqstp);
 549         min_size += RPCRDMA_INLINE_WRITE_THRESHOLD(task->tk_rqstp);
 550         if (size < min_size)
 551                 size = min_size;
 552
 553         rb = rpcrdma_alloc_regbuf(&r_xprt->rx_ia, size, flags);
 554         if (IS_ERR(rb))
 555                 goto out_fail;
 556         rb->rg_owner = req;
 557
 558         r_xprt->rx_stats.hardway_register_count += size;
 559         rpcrdma_free_regbuf(&r_xprt->rx_ia, req->rl_sendbuf);
 560         req->rl_sendbuf = rb;
 561         goto out;
 562
 563 out_fail:
 564         rpcrdma_buffer_put(req);
 565         r_xprt->rx_stats.failed_marshal_count++;
 566         return NULL;
 567 }
 568
 569 /*
 570  * This function returns all RDMA resources to the pool.
 571  */
 572 static void
 573 xprt_rdma_free(void *buffer)
 574 {
 575         struct rpcrdma_req *req;
 576         struct rpcrdma_xprt *r_xprt;
 577         struct rpcrdma_regbuf *rb;
 578         int i;
 579
 580         if (buffer == NULL)
 581                 return;
 582
 583         rb = container_of(buffer, struct rpcrdma_regbuf, rg_base[0]);
 584         req = rb->rg_owner;
 585         r_xprt = container_of(req->rl_buffer, struct rpcrdma_xprt, rx_buf);
 586
 587         dprintk("RPC:       %s: called on 0x%p\n", __func__, req->rl_reply);
 588
 589         for (i = 0; req->rl_nchunks;) {
 590                 --req->rl_nchunks;
 591                 i += r_xprt->rx_ia.ri_ops->ro_unmap(r_xprt,
 592                                                     &req->rl_segments[i]);
 593         }
 594
 595         rpcrdma_buffer_put(req);
 596 }
 597
 598 /*
 599  * send_request invokes the meat of RPC RDMA. It must do the following:
 600  *  1.  Marshal the RPC request into an RPC RDMA request, which means
 601  *      putting a header in front of data, and creating IOVs for RDMA
 602  *      from those in the request.
 603  *  2.  In marshaling, detect opportunities for RDMA, and use them.
 604  *  3.  Post a recv message to set up asynch completion, then send
 605  *      the request (rpcrdma_ep_post).
 606  *  4.  No partial sends are possible in the RPC-RDMA protocol (as in UDP).
 607  */
 608
 609 static int
 610 xprt_rdma_send_request(struct rpc_task *task)
 611 {
 612         struct rpc_rqst *rqst = task->tk_rqstp;
 613         struct rpc_xprt *xprt = rqst->rq_xprt;
 614         struct rpcrdma_req *req = rpcr_to_rdmar(rqst);
 615         struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
 616         int rc = 0;
 617
 618         rc = rpcrdma_marshal_req(rqst);
 619         if (rc < 0)
 620                 goto failed_marshal;
 621
 622         if (req->rl_reply == NULL)              /* e.g. reconnection */
 623                 rpcrdma_recv_buffer_get(req);
 624
 625         /* Must suppress retransmit to maintain credits */
 626         if (req->rl_connect_cookie == xprt->connect_cookie)
 627                 goto drop_connection;
 628         req->rl_connect_cookie = xprt->connect_cookie;
 629
 630         if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req))
 631                 goto drop_connection;
 632
 633         rqst->rq_xmit_bytes_sent += rqst->rq_snd_buf.len;
 634         rqst->rq_bytes_sent = 0;
 635         return 0;
 636
 637 failed_marshal:
 638         r_xprt->rx_stats.failed_marshal_count++;
 639         dprintk("RPC:       %s: rpcrdma_marshal_req failed, status %i\n",
 640                 __func__, rc);
 641         if (rc == -EIO)
 642                 return -EIO;
 643 drop_connection:
 644         xprt_disconnect_done(xprt);
 645         return -ENOTCONN;       /* implies disconnect */
 646 }
 647
 648 static void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
 649 {
 650         struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt);
 651         long idle_time = 0;
 652
 653         if (xprt_connected(xprt))
 654                 idle_time = (long)(jiffies - xprt->last_used) / HZ;
 655
 656         seq_printf(seq,
 657           "\txprt:\trdma %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu "
 658           "%lu %lu %lu %Lu %Lu %Lu %Lu %lu %lu %lu\n",
 659
 660            0,   /* need a local port? */
 661            xprt->stat.bind_count,
 662            xprt->stat.connect_count,
 663            xprt->stat.connect_time,
 664            idle_time,
 665            xprt->stat.sends,
 666            xprt->stat.recvs,
 667            xprt->stat.bad_xids,
 668            xprt->stat.req_u,
 669            xprt->stat.bklog_u,
 670
 671            r_xprt->rx_stats.read_chunk_count,
 672            r_xprt->rx_stats.write_chunk_count,
 673            r_xprt->rx_stats.reply_chunk_count,
 674            r_xprt->rx_stats.total_rdma_request,
 675            r_xprt->rx_stats.total_rdma_reply,
 676            r_xprt->rx_stats.pullup_copy_count,
 677            r_xprt->rx_stats.fixup_copy_count,
 678            r_xprt->rx_stats.hardway_register_count,
 679            r_xprt->rx_stats.failed_marshal_count,
 680            r_xprt->rx_stats.bad_reply_count);
 681 }
 682
 683 static int
 684 xprt_rdma_enable_swap(struct rpc_xprt *xprt)
 685 {
 686         return -EINVAL;
 687 }
 688
 689 static void
 690 xprt_rdma_disable_swap(struct rpc_xprt *xprt)
 691 {
 692 }
 693
 694 /*
 695  * Plumbing for rpc transport switch and kernel module
 696  */
 697
 698 static struct rpc_xprt_ops xprt_rdma_procs = {
 699         .reserve_xprt           = xprt_reserve_xprt_cong,
 700         .release_xprt           = xprt_release_xprt_cong, /* sunrpc/xprt.c */
 701         .alloc_slot             = xprt_alloc_slot,
 702         .release_request        = xprt_release_rqst_cong,       /* ditto */
 703         .set_retrans_timeout    = xprt_set_retrans_timeout_def, /* ditto */
 704         .rpcbind                = rpcb_getport_async,   /* sunrpc/rpcb_clnt.c */
 705         .set_port               = xprt_rdma_set_port,
 706         .connect                = xprt_rdma_connect,
 707         .buf_alloc              = xprt_rdma_allocate,
 708         .buf_free               = xprt_rdma_free,
 709         .send_request           = xprt_rdma_send_request,
 710         .close                  = xprt_rdma_close,
 711         .destroy                = xprt_rdma_destroy,
 712         .print_stats            = xprt_rdma_print_stats,
 713         .enable_swap            = xprt_rdma_enable_swap,
 714         .disable_swap           = xprt_rdma_disable_swap,
 715         .inject_disconnect      = xprt_rdma_inject_disconnect
 716 };
 717
 718 static struct xprt_class xprt_rdma = {
 719         .list                   = LIST_HEAD_INIT(xprt_rdma.list),
 720         .name                   = "rdma",
 721         .owner                  = THIS_MODULE,
 722         .ident                  = XPRT_TRANSPORT_RDMA,
 723         .setup                  = xprt_setup_rdma,
 724 };
 725
 726 void xprt_rdma_cleanup(void)
 727 {
 728         int rc;
 729
 730         dprintk("RPCRDMA Module Removed, deregister RPC RDMA transport\n");
 731 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
 732         if (sunrpc_table_header) {
 733                 unregister_sysctl_table(sunrpc_table_header);
 734                 sunrpc_table_header = NULL;
 735         }
 736 #endif
 737         rc = xprt_unregister_transport(&xprt_rdma);
 738         if (rc)
 739                 dprintk("RPC:       %s: xprt_unregister returned %i\n",
 740                         __func__, rc);
 741
 742         frwr_destroy_recovery_wq();
 743 }
 744
 745 int xprt_rdma_init(void)
 746 {
 747         int rc;
 748
 749         rc = frwr_alloc_recovery_wq();
 750         if (rc)
 751                 return rc;
 752
 753         rc = xprt_register_transport(&xprt_rdma);
 754         if (rc) {
 755                 frwr_destroy_recovery_wq();
 756                 return rc;
 757         }
 758
 759         dprintk("RPCRDMA Module Init, register RPC RDMA transport\n");
 760
 761         dprintk("Defaults:\n");
 762         dprintk("\tSlots %d\n"
 763                 "\tMaxInlineRead %d\n\tMaxInlineWrite %d\n",
 764                 xprt_rdma_slot_table_entries,
 765                 xprt_rdma_max_inline_read, xprt_rdma_max_inline_write);
 766         dprintk("\tPadding %d\n\tMemreg %d\n",
 767                 xprt_rdma_inline_write_padding, xprt_rdma_memreg_strategy);
 768
 769 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
 770         if (!sunrpc_table_header)
 771                 sunrpc_table_header = register_sysctl_table(sunrpc_table);
 772 #endif
 773         return 0;
 774 }