\"Talpey, Thomas\ | f58851e | 2007-09-10 13:50:12 -0400 | [diff] [blame] | 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/init.h> |
| 52 | #include <linux/seq_file.h> |
| 53 | |
| 54 | #include "xprt_rdma.h" |
| 55 | |
| 56 | #ifdef RPC_DEBUG |
| 57 | # define RPCDBG_FACILITY RPCDBG_TRANS |
| 58 | #endif |
| 59 | |
| 60 | MODULE_LICENSE("Dual BSD/GPL"); |
| 61 | |
| 62 | MODULE_DESCRIPTION("RPC/RDMA Transport for Linux kernel NFS"); |
| 63 | MODULE_AUTHOR("Network Appliance, Inc."); |
| 64 | |
| 65 | /* |
| 66 | * tunables |
| 67 | */ |
| 68 | |
| 69 | static unsigned int xprt_rdma_slot_table_entries = RPCRDMA_DEF_SLOT_TABLE; |
| 70 | static unsigned int xprt_rdma_max_inline_read = RPCRDMA_DEF_INLINE; |
| 71 | static unsigned int xprt_rdma_max_inline_write = RPCRDMA_DEF_INLINE; |
| 72 | static unsigned int xprt_rdma_inline_write_padding; |
Tom Talpey | 3197d309 | 2008-10-09 15:00:20 -0400 | [diff] [blame] | 73 | static unsigned int xprt_rdma_memreg_strategy = RPCRDMA_FRMR; |
\"Talpey, Thomas\ | f58851e | 2007-09-10 13:50:12 -0400 | [diff] [blame] | 74 | |
| 75 | #ifdef RPC_DEBUG |
| 76 | |
| 77 | static unsigned int min_slot_table_size = RPCRDMA_MIN_SLOT_TABLE; |
| 78 | static unsigned int max_slot_table_size = RPCRDMA_MAX_SLOT_TABLE; |
| 79 | static unsigned int zero; |
| 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 | |
| 84 | static struct ctl_table_header *sunrpc_table_header; |
| 85 | |
| 86 | static ctl_table xr_tunables_table[] = { |
| 87 | { |
James Lentini | cfcb43f | 2007-11-26 12:42:44 -0500 | [diff] [blame] | 88 | .ctl_name = CTL_UNNUMBERED, |
\"Talpey, Thomas\ | f58851e | 2007-09-10 13:50:12 -0400 | [diff] [blame] | 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 | .strategy = &sysctl_intvec, |
| 95 | .extra1 = &min_slot_table_size, |
| 96 | .extra2 = &max_slot_table_size |
| 97 | }, |
| 98 | { |
James Lentini | cfcb43f | 2007-11-26 12:42:44 -0500 | [diff] [blame] | 99 | .ctl_name = CTL_UNNUMBERED, |
\"Talpey, Thomas\ | f58851e | 2007-09-10 13:50:12 -0400 | [diff] [blame] | 100 | .procname = "rdma_max_inline_read", |
| 101 | .data = &xprt_rdma_max_inline_read, |
| 102 | .maxlen = sizeof(unsigned int), |
| 103 | .mode = 0644, |
| 104 | .proc_handler = &proc_dointvec, |
| 105 | .strategy = &sysctl_intvec, |
| 106 | }, |
| 107 | { |
James Lentini | cfcb43f | 2007-11-26 12:42:44 -0500 | [diff] [blame] | 108 | .ctl_name = CTL_UNNUMBERED, |
\"Talpey, Thomas\ | f58851e | 2007-09-10 13:50:12 -0400 | [diff] [blame] | 109 | .procname = "rdma_max_inline_write", |
| 110 | .data = &xprt_rdma_max_inline_write, |
| 111 | .maxlen = sizeof(unsigned int), |
| 112 | .mode = 0644, |
| 113 | .proc_handler = &proc_dointvec, |
| 114 | .strategy = &sysctl_intvec, |
| 115 | }, |
| 116 | { |
James Lentini | cfcb43f | 2007-11-26 12:42:44 -0500 | [diff] [blame] | 117 | .ctl_name = CTL_UNNUMBERED, |
\"Talpey, Thomas\ | f58851e | 2007-09-10 13:50:12 -0400 | [diff] [blame] | 118 | .procname = "rdma_inline_write_padding", |
| 119 | .data = &xprt_rdma_inline_write_padding, |
| 120 | .maxlen = sizeof(unsigned int), |
| 121 | .mode = 0644, |
| 122 | .proc_handler = &proc_dointvec_minmax, |
| 123 | .strategy = &sysctl_intvec, |
| 124 | .extra1 = &zero, |
| 125 | .extra2 = &max_padding, |
| 126 | }, |
| 127 | { |
James Lentini | cfcb43f | 2007-11-26 12:42:44 -0500 | [diff] [blame] | 128 | .ctl_name = CTL_UNNUMBERED, |
\"Talpey, Thomas\ | f58851e | 2007-09-10 13:50:12 -0400 | [diff] [blame] | 129 | .procname = "rdma_memreg_strategy", |
| 130 | .data = &xprt_rdma_memreg_strategy, |
| 131 | .maxlen = sizeof(unsigned int), |
| 132 | .mode = 0644, |
| 133 | .proc_handler = &proc_dointvec_minmax, |
| 134 | .strategy = &sysctl_intvec, |
| 135 | .extra1 = &min_memreg, |
| 136 | .extra2 = &max_memreg, |
| 137 | }, |
| 138 | { |
| 139 | .ctl_name = 0, |
| 140 | }, |
| 141 | }; |
| 142 | |
| 143 | static ctl_table sunrpc_table[] = { |
| 144 | { |
| 145 | .ctl_name = CTL_SUNRPC, |
| 146 | .procname = "sunrpc", |
| 147 | .mode = 0555, |
| 148 | .child = xr_tunables_table |
| 149 | }, |
| 150 | { |
| 151 | .ctl_name = 0, |
| 152 | }, |
| 153 | }; |
| 154 | |
| 155 | #endif |
| 156 | |
| 157 | static struct rpc_xprt_ops xprt_rdma_procs; /* forward reference */ |
| 158 | |
| 159 | static void |
| 160 | xprt_rdma_format_addresses(struct rpc_xprt *xprt) |
| 161 | { |
| 162 | struct sockaddr_in *addr = (struct sockaddr_in *) |
| 163 | &rpcx_to_rdmad(xprt).addr; |
| 164 | char *buf; |
| 165 | |
| 166 | buf = kzalloc(20, GFP_KERNEL); |
| 167 | if (buf) |
| 168 | snprintf(buf, 20, NIPQUAD_FMT, NIPQUAD(addr->sin_addr.s_addr)); |
| 169 | xprt->address_strings[RPC_DISPLAY_ADDR] = buf; |
| 170 | |
| 171 | buf = kzalloc(8, GFP_KERNEL); |
| 172 | if (buf) |
| 173 | snprintf(buf, 8, "%u", ntohs(addr->sin_port)); |
| 174 | xprt->address_strings[RPC_DISPLAY_PORT] = buf; |
| 175 | |
| 176 | xprt->address_strings[RPC_DISPLAY_PROTO] = "rdma"; |
| 177 | |
| 178 | buf = kzalloc(48, GFP_KERNEL); |
| 179 | if (buf) |
| 180 | snprintf(buf, 48, "addr="NIPQUAD_FMT" port=%u proto=%s", |
| 181 | NIPQUAD(addr->sin_addr.s_addr), |
| 182 | ntohs(addr->sin_port), "rdma"); |
| 183 | xprt->address_strings[RPC_DISPLAY_ALL] = buf; |
| 184 | |
| 185 | buf = kzalloc(10, GFP_KERNEL); |
| 186 | if (buf) |
| 187 | snprintf(buf, 10, "%02x%02x%02x%02x", |
| 188 | NIPQUAD(addr->sin_addr.s_addr)); |
| 189 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; |
| 190 | |
| 191 | buf = kzalloc(8, GFP_KERNEL); |
| 192 | if (buf) |
| 193 | snprintf(buf, 8, "%4hx", ntohs(addr->sin_port)); |
| 194 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; |
| 195 | |
| 196 | buf = kzalloc(30, GFP_KERNEL); |
| 197 | if (buf) |
| 198 | snprintf(buf, 30, NIPQUAD_FMT".%u.%u", |
| 199 | NIPQUAD(addr->sin_addr.s_addr), |
| 200 | ntohs(addr->sin_port) >> 8, |
| 201 | ntohs(addr->sin_port) & 0xff); |
| 202 | xprt->address_strings[RPC_DISPLAY_UNIVERSAL_ADDR] = buf; |
| 203 | |
| 204 | /* netid */ |
| 205 | xprt->address_strings[RPC_DISPLAY_NETID] = "rdma"; |
| 206 | } |
| 207 | |
| 208 | static void |
| 209 | xprt_rdma_free_addresses(struct rpc_xprt *xprt) |
| 210 | { |
Chuck Lever | 33e01dc | 2008-01-14 12:32:20 -0500 | [diff] [blame] | 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 | } |
\"Talpey, Thomas\ | f58851e | 2007-09-10 13:50:12 -0400 | [diff] [blame] | 221 | } |
| 222 | |
| 223 | static void |
| 224 | xprt_rdma_connect_worker(struct work_struct *work) |
| 225 | { |
| 226 | struct rpcrdma_xprt *r_xprt = |
| 227 | container_of(work, struct rpcrdma_xprt, rdma_connect.work); |
| 228 | struct rpc_xprt *xprt = &r_xprt->xprt; |
| 229 | int rc = 0; |
| 230 | |
| 231 | if (!xprt->shutdown) { |
| 232 | xprt_clear_connected(xprt); |
| 233 | |
| 234 | dprintk("RPC: %s: %sconnect\n", __func__, |
| 235 | r_xprt->rx_ep.rep_connected != 0 ? "re" : ""); |
| 236 | rc = rpcrdma_ep_connect(&r_xprt->rx_ep, &r_xprt->rx_ia); |
| 237 | if (rc) |
| 238 | goto out; |
| 239 | } |
| 240 | goto out_clear; |
| 241 | |
| 242 | out: |
| 243 | xprt_wake_pending_tasks(xprt, rc); |
| 244 | |
| 245 | out_clear: |
| 246 | dprintk("RPC: %s: exit\n", __func__); |
| 247 | xprt_clear_connecting(xprt); |
| 248 | } |
| 249 | |
| 250 | /* |
| 251 | * xprt_rdma_destroy |
| 252 | * |
| 253 | * Destroy the xprt. |
| 254 | * Free all memory associated with the object, including its own. |
| 255 | * NOTE: none of the *destroy methods free memory for their top-level |
| 256 | * objects, even though they may have allocated it (they do free |
| 257 | * private memory). It's up to the caller to handle it. In this |
| 258 | * case (RDMA transport), all structure memory is inlined with the |
| 259 | * struct rpcrdma_xprt. |
| 260 | */ |
| 261 | static void |
| 262 | xprt_rdma_destroy(struct rpc_xprt *xprt) |
| 263 | { |
| 264 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); |
| 265 | int rc; |
| 266 | |
| 267 | dprintk("RPC: %s: called\n", __func__); |
| 268 | |
| 269 | cancel_delayed_work(&r_xprt->rdma_connect); |
| 270 | flush_scheduled_work(); |
| 271 | |
| 272 | xprt_clear_connected(xprt); |
| 273 | |
| 274 | rpcrdma_buffer_destroy(&r_xprt->rx_buf); |
| 275 | rc = rpcrdma_ep_destroy(&r_xprt->rx_ep, &r_xprt->rx_ia); |
| 276 | if (rc) |
| 277 | dprintk("RPC: %s: rpcrdma_ep_destroy returned %i\n", |
| 278 | __func__, rc); |
| 279 | rpcrdma_ia_close(&r_xprt->rx_ia); |
| 280 | |
| 281 | xprt_rdma_free_addresses(xprt); |
| 282 | |
| 283 | kfree(xprt->slot); |
| 284 | xprt->slot = NULL; |
| 285 | kfree(xprt); |
| 286 | |
| 287 | dprintk("RPC: %s: returning\n", __func__); |
| 288 | |
| 289 | module_put(THIS_MODULE); |
| 290 | } |
| 291 | |
Trond Myklebust | 2881ae7 | 2007-12-20 16:03:54 -0500 | [diff] [blame] | 292 | static const struct rpc_timeout xprt_rdma_default_timeout = { |
| 293 | .to_initval = 60 * HZ, |
| 294 | .to_maxval = 60 * HZ, |
| 295 | }; |
| 296 | |
\"Talpey, Thomas\ | f58851e | 2007-09-10 13:50:12 -0400 | [diff] [blame] | 297 | /** |
| 298 | * xprt_setup_rdma - Set up transport to use RDMA |
| 299 | * |
| 300 | * @args: rpc transport arguments |
| 301 | */ |
| 302 | static struct rpc_xprt * |
| 303 | xprt_setup_rdma(struct xprt_create *args) |
| 304 | { |
| 305 | struct rpcrdma_create_data_internal cdata; |
| 306 | struct rpc_xprt *xprt; |
| 307 | struct rpcrdma_xprt *new_xprt; |
| 308 | struct rpcrdma_ep *new_ep; |
| 309 | struct sockaddr_in *sin; |
| 310 | int rc; |
| 311 | |
| 312 | if (args->addrlen > sizeof(xprt->addr)) { |
| 313 | dprintk("RPC: %s: address too large\n", __func__); |
| 314 | return ERR_PTR(-EBADF); |
| 315 | } |
| 316 | |
| 317 | xprt = kzalloc(sizeof(struct rpcrdma_xprt), GFP_KERNEL); |
| 318 | if (xprt == NULL) { |
| 319 | dprintk("RPC: %s: couldn't allocate rpcrdma_xprt\n", |
| 320 | __func__); |
| 321 | return ERR_PTR(-ENOMEM); |
| 322 | } |
| 323 | |
| 324 | xprt->max_reqs = xprt_rdma_slot_table_entries; |
| 325 | xprt->slot = kcalloc(xprt->max_reqs, |
| 326 | sizeof(struct rpc_rqst), GFP_KERNEL); |
| 327 | if (xprt->slot == NULL) { |
\"Talpey, Thomas\ | f58851e | 2007-09-10 13:50:12 -0400 | [diff] [blame] | 328 | dprintk("RPC: %s: couldn't allocate %d slots\n", |
| 329 | __func__, xprt->max_reqs); |
Adrian Bunk | d5cd978 | 2007-11-14 17:00:00 -0800 | [diff] [blame] | 330 | kfree(xprt); |
\"Talpey, Thomas\ | f58851e | 2007-09-10 13:50:12 -0400 | [diff] [blame] | 331 | return ERR_PTR(-ENOMEM); |
| 332 | } |
| 333 | |
| 334 | /* 60 second timeout, no retries */ |
Trond Myklebust | ba7392b | 2007-12-20 16:03:55 -0500 | [diff] [blame] | 335 | xprt->timeout = &xprt_rdma_default_timeout; |
\"Talpey, Thomas\ | f58851e | 2007-09-10 13:50:12 -0400 | [diff] [blame] | 336 | xprt->bind_timeout = (60U * HZ); |
| 337 | xprt->connect_timeout = (60U * HZ); |
| 338 | xprt->reestablish_timeout = (5U * HZ); |
| 339 | xprt->idle_timeout = (5U * 60 * HZ); |
| 340 | |
| 341 | xprt->resvport = 0; /* privileged port not needed */ |
| 342 | xprt->tsh_size = 0; /* RPC-RDMA handles framing */ |
| 343 | xprt->max_payload = RPCRDMA_MAX_DATA_SEGS * PAGE_SIZE; |
| 344 | xprt->ops = &xprt_rdma_procs; |
| 345 | |
| 346 | /* |
| 347 | * Set up RDMA-specific connect data. |
| 348 | */ |
| 349 | |
| 350 | /* Put server RDMA address in local cdata */ |
| 351 | memcpy(&cdata.addr, args->dstaddr, args->addrlen); |
| 352 | |
| 353 | /* Ensure xprt->addr holds valid server TCP (not RDMA) |
| 354 | * address, for any side protocols which peek at it */ |
| 355 | xprt->prot = IPPROTO_TCP; |
| 356 | xprt->addrlen = args->addrlen; |
| 357 | memcpy(&xprt->addr, &cdata.addr, xprt->addrlen); |
| 358 | |
| 359 | sin = (struct sockaddr_in *)&cdata.addr; |
| 360 | if (ntohs(sin->sin_port) != 0) |
| 361 | xprt_set_bound(xprt); |
| 362 | |
| 363 | dprintk("RPC: %s: %u.%u.%u.%u:%u\n", __func__, |
| 364 | NIPQUAD(sin->sin_addr.s_addr), ntohs(sin->sin_port)); |
| 365 | |
| 366 | /* Set max requests */ |
| 367 | cdata.max_requests = xprt->max_reqs; |
| 368 | |
| 369 | /* Set some length limits */ |
| 370 | cdata.rsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA write max */ |
| 371 | cdata.wsize = RPCRDMA_MAX_SEGS * PAGE_SIZE; /* RDMA read max */ |
| 372 | |
| 373 | cdata.inline_wsize = xprt_rdma_max_inline_write; |
| 374 | if (cdata.inline_wsize > cdata.wsize) |
| 375 | cdata.inline_wsize = cdata.wsize; |
| 376 | |
| 377 | cdata.inline_rsize = xprt_rdma_max_inline_read; |
| 378 | if (cdata.inline_rsize > cdata.rsize) |
| 379 | cdata.inline_rsize = cdata.rsize; |
| 380 | |
| 381 | cdata.padding = xprt_rdma_inline_write_padding; |
| 382 | |
| 383 | /* |
| 384 | * Create new transport instance, which includes initialized |
| 385 | * o ia |
| 386 | * o endpoint |
| 387 | * o buffers |
| 388 | */ |
| 389 | |
| 390 | new_xprt = rpcx_to_rdmax(xprt); |
| 391 | |
| 392 | rc = rpcrdma_ia_open(new_xprt, (struct sockaddr *) &cdata.addr, |
| 393 | xprt_rdma_memreg_strategy); |
| 394 | if (rc) |
| 395 | goto out1; |
| 396 | |
| 397 | /* |
| 398 | * initialize and create ep |
| 399 | */ |
| 400 | new_xprt->rx_data = cdata; |
| 401 | new_ep = &new_xprt->rx_ep; |
| 402 | new_ep->rep_remote_addr = cdata.addr; |
| 403 | |
| 404 | rc = rpcrdma_ep_create(&new_xprt->rx_ep, |
| 405 | &new_xprt->rx_ia, &new_xprt->rx_data); |
| 406 | if (rc) |
| 407 | goto out2; |
| 408 | |
| 409 | /* |
| 410 | * Allocate pre-registered send and receive buffers for headers and |
| 411 | * any inline data. Also specify any padding which will be provided |
| 412 | * from a preregistered zero buffer. |
| 413 | */ |
| 414 | rc = rpcrdma_buffer_create(&new_xprt->rx_buf, new_ep, &new_xprt->rx_ia, |
| 415 | &new_xprt->rx_data); |
| 416 | if (rc) |
| 417 | goto out3; |
| 418 | |
| 419 | /* |
| 420 | * Register a callback for connection events. This is necessary because |
| 421 | * connection loss notification is async. We also catch connection loss |
| 422 | * when reaping receives. |
| 423 | */ |
| 424 | INIT_DELAYED_WORK(&new_xprt->rdma_connect, xprt_rdma_connect_worker); |
| 425 | new_ep->rep_func = rpcrdma_conn_func; |
| 426 | new_ep->rep_xprt = xprt; |
| 427 | |
| 428 | xprt_rdma_format_addresses(xprt); |
| 429 | |
| 430 | if (!try_module_get(THIS_MODULE)) |
| 431 | goto out4; |
| 432 | |
| 433 | return xprt; |
| 434 | |
| 435 | out4: |
| 436 | xprt_rdma_free_addresses(xprt); |
| 437 | rc = -EINVAL; |
| 438 | out3: |
| 439 | (void) rpcrdma_ep_destroy(new_ep, &new_xprt->rx_ia); |
| 440 | out2: |
| 441 | rpcrdma_ia_close(&new_xprt->rx_ia); |
| 442 | out1: |
| 443 | kfree(xprt->slot); |
| 444 | kfree(xprt); |
| 445 | return ERR_PTR(rc); |
| 446 | } |
| 447 | |
| 448 | /* |
| 449 | * Close a connection, during shutdown or timeout/reconnect |
| 450 | */ |
| 451 | static void |
| 452 | xprt_rdma_close(struct rpc_xprt *xprt) |
| 453 | { |
| 454 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); |
| 455 | |
| 456 | dprintk("RPC: %s: closing\n", __func__); |
Trond Myklebust | 62da3b2 | 2007-11-06 18:44:20 -0500 | [diff] [blame] | 457 | xprt_disconnect_done(xprt); |
\"Talpey, Thomas\ | f58851e | 2007-09-10 13:50:12 -0400 | [diff] [blame] | 458 | (void) rpcrdma_ep_disconnect(&r_xprt->rx_ep, &r_xprt->rx_ia); |
| 459 | } |
| 460 | |
| 461 | static void |
| 462 | xprt_rdma_set_port(struct rpc_xprt *xprt, u16 port) |
| 463 | { |
| 464 | struct sockaddr_in *sap; |
| 465 | |
| 466 | sap = (struct sockaddr_in *)&xprt->addr; |
| 467 | sap->sin_port = htons(port); |
| 468 | sap = (struct sockaddr_in *)&rpcx_to_rdmad(xprt).addr; |
| 469 | sap->sin_port = htons(port); |
| 470 | dprintk("RPC: %s: %u\n", __func__, port); |
| 471 | } |
| 472 | |
| 473 | static void |
| 474 | xprt_rdma_connect(struct rpc_task *task) |
| 475 | { |
| 476 | struct rpc_xprt *xprt = (struct rpc_xprt *)task->tk_xprt; |
| 477 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); |
| 478 | |
| 479 | if (!xprt_test_and_set_connecting(xprt)) { |
| 480 | if (r_xprt->rx_ep.rep_connected != 0) { |
| 481 | /* Reconnect */ |
| 482 | schedule_delayed_work(&r_xprt->rdma_connect, |
| 483 | xprt->reestablish_timeout); |
| 484 | } else { |
| 485 | schedule_delayed_work(&r_xprt->rdma_connect, 0); |
| 486 | if (!RPC_IS_ASYNC(task)) |
| 487 | flush_scheduled_work(); |
| 488 | } |
| 489 | } |
| 490 | } |
| 491 | |
| 492 | static int |
| 493 | xprt_rdma_reserve_xprt(struct rpc_task *task) |
| 494 | { |
| 495 | struct rpc_xprt *xprt = task->tk_xprt; |
| 496 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); |
| 497 | int credits = atomic_read(&r_xprt->rx_buf.rb_credits); |
| 498 | |
| 499 | /* == RPC_CWNDSCALE @ init, but *after* setup */ |
| 500 | if (r_xprt->rx_buf.rb_cwndscale == 0UL) { |
| 501 | r_xprt->rx_buf.rb_cwndscale = xprt->cwnd; |
| 502 | dprintk("RPC: %s: cwndscale %lu\n", __func__, |
| 503 | r_xprt->rx_buf.rb_cwndscale); |
| 504 | BUG_ON(r_xprt->rx_buf.rb_cwndscale <= 0); |
| 505 | } |
| 506 | xprt->cwnd = credits * r_xprt->rx_buf.rb_cwndscale; |
| 507 | return xprt_reserve_xprt_cong(task); |
| 508 | } |
| 509 | |
| 510 | /* |
| 511 | * The RDMA allocate/free functions need the task structure as a place |
| 512 | * to hide the struct rpcrdma_req, which is necessary for the actual send/recv |
| 513 | * sequence. For this reason, the recv buffers are attached to send |
| 514 | * buffers for portions of the RPC. Note that the RPC layer allocates |
| 515 | * both send and receive buffers in the same call. We may register |
| 516 | * the receive buffer portion when using reply chunks. |
| 517 | */ |
| 518 | static void * |
| 519 | xprt_rdma_allocate(struct rpc_task *task, size_t size) |
| 520 | { |
| 521 | struct rpc_xprt *xprt = task->tk_xprt; |
| 522 | struct rpcrdma_req *req, *nreq; |
| 523 | |
| 524 | req = rpcrdma_buffer_get(&rpcx_to_rdmax(xprt)->rx_buf); |
| 525 | BUG_ON(NULL == req); |
| 526 | |
| 527 | if (size > req->rl_size) { |
| 528 | dprintk("RPC: %s: size %zd too large for buffer[%zd]: " |
| 529 | "prog %d vers %d proc %d\n", |
| 530 | __func__, size, req->rl_size, |
| 531 | task->tk_client->cl_prog, task->tk_client->cl_vers, |
| 532 | task->tk_msg.rpc_proc->p_proc); |
| 533 | /* |
| 534 | * Outgoing length shortage. Our inline write max must have |
| 535 | * been configured to perform direct i/o. |
| 536 | * |
| 537 | * This is therefore a large metadata operation, and the |
| 538 | * allocate call was made on the maximum possible message, |
| 539 | * e.g. containing long filename(s) or symlink data. In |
| 540 | * fact, while these metadata operations *might* carry |
| 541 | * large outgoing payloads, they rarely *do*. However, we |
| 542 | * have to commit to the request here, so reallocate and |
| 543 | * register it now. The data path will never require this |
| 544 | * reallocation. |
| 545 | * |
| 546 | * If the allocation or registration fails, the RPC framework |
| 547 | * will (doggedly) retry. |
| 548 | */ |
| 549 | if (rpcx_to_rdmax(xprt)->rx_ia.ri_memreg_strategy == |
| 550 | RPCRDMA_BOUNCEBUFFERS) { |
| 551 | /* forced to "pure inline" */ |
| 552 | dprintk("RPC: %s: too much data (%zd) for inline " |
| 553 | "(r/w max %d/%d)\n", __func__, size, |
| 554 | rpcx_to_rdmad(xprt).inline_rsize, |
| 555 | rpcx_to_rdmad(xprt).inline_wsize); |
| 556 | size = req->rl_size; |
| 557 | rpc_exit(task, -EIO); /* fail the operation */ |
| 558 | rpcx_to_rdmax(xprt)->rx_stats.failed_marshal_count++; |
| 559 | goto out; |
| 560 | } |
| 561 | if (task->tk_flags & RPC_TASK_SWAPPER) |
| 562 | nreq = kmalloc(sizeof *req + size, GFP_ATOMIC); |
| 563 | else |
| 564 | nreq = kmalloc(sizeof *req + size, GFP_NOFS); |
| 565 | if (nreq == NULL) |
| 566 | goto outfail; |
| 567 | |
| 568 | if (rpcrdma_register_internal(&rpcx_to_rdmax(xprt)->rx_ia, |
| 569 | nreq->rl_base, size + sizeof(struct rpcrdma_req) |
| 570 | - offsetof(struct rpcrdma_req, rl_base), |
| 571 | &nreq->rl_handle, &nreq->rl_iov)) { |
| 572 | kfree(nreq); |
| 573 | goto outfail; |
| 574 | } |
| 575 | rpcx_to_rdmax(xprt)->rx_stats.hardway_register_count += size; |
| 576 | nreq->rl_size = size; |
| 577 | nreq->rl_niovs = 0; |
| 578 | nreq->rl_nchunks = 0; |
| 579 | nreq->rl_buffer = (struct rpcrdma_buffer *)req; |
| 580 | nreq->rl_reply = req->rl_reply; |
| 581 | memcpy(nreq->rl_segments, |
| 582 | req->rl_segments, sizeof nreq->rl_segments); |
| 583 | /* flag the swap with an unused field */ |
| 584 | nreq->rl_iov.length = 0; |
| 585 | req->rl_reply = NULL; |
| 586 | req = nreq; |
| 587 | } |
| 588 | dprintk("RPC: %s: size %zd, request 0x%p\n", __func__, size, req); |
| 589 | out: |
| 590 | return req->rl_xdr_buf; |
| 591 | |
| 592 | outfail: |
| 593 | rpcrdma_buffer_put(req); |
| 594 | rpcx_to_rdmax(xprt)->rx_stats.failed_marshal_count++; |
| 595 | return NULL; |
| 596 | } |
| 597 | |
| 598 | /* |
| 599 | * This function returns all RDMA resources to the pool. |
| 600 | */ |
| 601 | static void |
| 602 | xprt_rdma_free(void *buffer) |
| 603 | { |
| 604 | struct rpcrdma_req *req; |
| 605 | struct rpcrdma_xprt *r_xprt; |
| 606 | struct rpcrdma_rep *rep; |
| 607 | int i; |
| 608 | |
| 609 | if (buffer == NULL) |
| 610 | return; |
| 611 | |
| 612 | req = container_of(buffer, struct rpcrdma_req, rl_xdr_buf[0]); |
Tom Talpey | ee1a2c5 | 2008-02-27 15:04:26 -0500 | [diff] [blame] | 613 | if (req->rl_iov.length == 0) { /* see allocate above */ |
| 614 | r_xprt = container_of(((struct rpcrdma_req *) req->rl_buffer)->rl_buffer, |
| 615 | struct rpcrdma_xprt, rx_buf); |
| 616 | } else |
| 617 | r_xprt = container_of(req->rl_buffer, struct rpcrdma_xprt, rx_buf); |
\"Talpey, Thomas\ | f58851e | 2007-09-10 13:50:12 -0400 | [diff] [blame] | 618 | rep = req->rl_reply; |
| 619 | |
| 620 | dprintk("RPC: %s: called on 0x%p%s\n", |
| 621 | __func__, rep, (rep && rep->rr_func) ? " (with waiter)" : ""); |
| 622 | |
| 623 | /* |
| 624 | * Finish the deregistration. When using mw bind, this was |
| 625 | * begun in rpcrdma_reply_handler(). In all other modes, we |
| 626 | * do it here, in thread context. The process is considered |
| 627 | * complete when the rr_func vector becomes NULL - this |
| 628 | * was put in place during rpcrdma_reply_handler() - the wait |
| 629 | * call below will not block if the dereg is "done". If |
| 630 | * interrupted, our framework will clean up. |
| 631 | */ |
| 632 | for (i = 0; req->rl_nchunks;) { |
| 633 | --req->rl_nchunks; |
| 634 | i += rpcrdma_deregister_external( |
| 635 | &req->rl_segments[i], r_xprt, NULL); |
| 636 | } |
| 637 | |
| 638 | if (rep && wait_event_interruptible(rep->rr_unbind, !rep->rr_func)) { |
| 639 | rep->rr_func = NULL; /* abandon the callback */ |
| 640 | req->rl_reply = NULL; |
| 641 | } |
| 642 | |
| 643 | if (req->rl_iov.length == 0) { /* see allocate above */ |
| 644 | struct rpcrdma_req *oreq = (struct rpcrdma_req *)req->rl_buffer; |
| 645 | oreq->rl_reply = req->rl_reply; |
| 646 | (void) rpcrdma_deregister_internal(&r_xprt->rx_ia, |
| 647 | req->rl_handle, |
| 648 | &req->rl_iov); |
| 649 | kfree(req); |
| 650 | req = oreq; |
| 651 | } |
| 652 | |
| 653 | /* Put back request+reply buffers */ |
| 654 | rpcrdma_buffer_put(req); |
| 655 | } |
| 656 | |
| 657 | /* |
| 658 | * send_request invokes the meat of RPC RDMA. It must do the following: |
| 659 | * 1. Marshal the RPC request into an RPC RDMA request, which means |
| 660 | * putting a header in front of data, and creating IOVs for RDMA |
| 661 | * from those in the request. |
| 662 | * 2. In marshaling, detect opportunities for RDMA, and use them. |
| 663 | * 3. Post a recv message to set up asynch completion, then send |
| 664 | * the request (rpcrdma_ep_post). |
| 665 | * 4. No partial sends are possible in the RPC-RDMA protocol (as in UDP). |
| 666 | */ |
| 667 | |
| 668 | static int |
| 669 | xprt_rdma_send_request(struct rpc_task *task) |
| 670 | { |
| 671 | struct rpc_rqst *rqst = task->tk_rqstp; |
| 672 | struct rpc_xprt *xprt = task->tk_xprt; |
| 673 | struct rpcrdma_req *req = rpcr_to_rdmar(rqst); |
| 674 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); |
| 675 | |
| 676 | /* marshal the send itself */ |
| 677 | if (req->rl_niovs == 0 && rpcrdma_marshal_req(rqst) != 0) { |
| 678 | r_xprt->rx_stats.failed_marshal_count++; |
| 679 | dprintk("RPC: %s: rpcrdma_marshal_req failed\n", |
| 680 | __func__); |
| 681 | return -EIO; |
| 682 | } |
| 683 | |
| 684 | if (req->rl_reply == NULL) /* e.g. reconnection */ |
| 685 | rpcrdma_recv_buffer_get(req); |
| 686 | |
| 687 | if (req->rl_reply) { |
| 688 | req->rl_reply->rr_func = rpcrdma_reply_handler; |
| 689 | /* this need only be done once, but... */ |
| 690 | req->rl_reply->rr_xprt = xprt; |
| 691 | } |
| 692 | |
| 693 | if (rpcrdma_ep_post(&r_xprt->rx_ia, &r_xprt->rx_ep, req)) { |
Trond Myklebust | 62da3b2 | 2007-11-06 18:44:20 -0500 | [diff] [blame] | 694 | xprt_disconnect_done(xprt); |
\"Talpey, Thomas\ | f58851e | 2007-09-10 13:50:12 -0400 | [diff] [blame] | 695 | return -ENOTCONN; /* implies disconnect */ |
| 696 | } |
| 697 | |
| 698 | rqst->rq_bytes_sent = 0; |
| 699 | return 0; |
| 700 | } |
| 701 | |
| 702 | static void xprt_rdma_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) |
| 703 | { |
| 704 | struct rpcrdma_xprt *r_xprt = rpcx_to_rdmax(xprt); |
| 705 | long idle_time = 0; |
| 706 | |
| 707 | if (xprt_connected(xprt)) |
| 708 | idle_time = (long)(jiffies - xprt->last_used) / HZ; |
| 709 | |
| 710 | seq_printf(seq, |
| 711 | "\txprt:\trdma %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu " |
| 712 | "%lu %lu %lu %Lu %Lu %Lu %Lu %lu %lu %lu\n", |
| 713 | |
| 714 | 0, /* need a local port? */ |
| 715 | xprt->stat.bind_count, |
| 716 | xprt->stat.connect_count, |
| 717 | xprt->stat.connect_time, |
| 718 | idle_time, |
| 719 | xprt->stat.sends, |
| 720 | xprt->stat.recvs, |
| 721 | xprt->stat.bad_xids, |
| 722 | xprt->stat.req_u, |
| 723 | xprt->stat.bklog_u, |
| 724 | |
| 725 | r_xprt->rx_stats.read_chunk_count, |
| 726 | r_xprt->rx_stats.write_chunk_count, |
| 727 | r_xprt->rx_stats.reply_chunk_count, |
| 728 | r_xprt->rx_stats.total_rdma_request, |
| 729 | r_xprt->rx_stats.total_rdma_reply, |
| 730 | r_xprt->rx_stats.pullup_copy_count, |
| 731 | r_xprt->rx_stats.fixup_copy_count, |
| 732 | r_xprt->rx_stats.hardway_register_count, |
| 733 | r_xprt->rx_stats.failed_marshal_count, |
| 734 | r_xprt->rx_stats.bad_reply_count); |
| 735 | } |
| 736 | |
| 737 | /* |
| 738 | * Plumbing for rpc transport switch and kernel module |
| 739 | */ |
| 740 | |
| 741 | static struct rpc_xprt_ops xprt_rdma_procs = { |
| 742 | .reserve_xprt = xprt_rdma_reserve_xprt, |
| 743 | .release_xprt = xprt_release_xprt_cong, /* sunrpc/xprt.c */ |
| 744 | .release_request = xprt_release_rqst_cong, /* ditto */ |
| 745 | .set_retrans_timeout = xprt_set_retrans_timeout_def, /* ditto */ |
| 746 | .rpcbind = rpcb_getport_async, /* sunrpc/rpcb_clnt.c */ |
| 747 | .set_port = xprt_rdma_set_port, |
| 748 | .connect = xprt_rdma_connect, |
| 749 | .buf_alloc = xprt_rdma_allocate, |
| 750 | .buf_free = xprt_rdma_free, |
| 751 | .send_request = xprt_rdma_send_request, |
| 752 | .close = xprt_rdma_close, |
| 753 | .destroy = xprt_rdma_destroy, |
| 754 | .print_stats = xprt_rdma_print_stats |
| 755 | }; |
| 756 | |
| 757 | static struct xprt_class xprt_rdma = { |
| 758 | .list = LIST_HEAD_INIT(xprt_rdma.list), |
| 759 | .name = "rdma", |
| 760 | .owner = THIS_MODULE, |
| 761 | .ident = XPRT_TRANSPORT_RDMA, |
| 762 | .setup = xprt_setup_rdma, |
| 763 | }; |
| 764 | |
| 765 | static void __exit xprt_rdma_cleanup(void) |
| 766 | { |
| 767 | int rc; |
| 768 | |
| 769 | dprintk("RPCRDMA Module Removed, deregister RPC RDMA transport\n"); |
| 770 | #ifdef RPC_DEBUG |
| 771 | if (sunrpc_table_header) { |
| 772 | unregister_sysctl_table(sunrpc_table_header); |
| 773 | sunrpc_table_header = NULL; |
| 774 | } |
| 775 | #endif |
| 776 | rc = xprt_unregister_transport(&xprt_rdma); |
| 777 | if (rc) |
| 778 | dprintk("RPC: %s: xprt_unregister returned %i\n", |
| 779 | __func__, rc); |
| 780 | } |
| 781 | |
| 782 | static int __init xprt_rdma_init(void) |
| 783 | { |
| 784 | int rc; |
| 785 | |
| 786 | rc = xprt_register_transport(&xprt_rdma); |
| 787 | |
| 788 | if (rc) |
| 789 | return rc; |
| 790 | |
| 791 | dprintk(KERN_INFO "RPCRDMA Module Init, register RPC RDMA transport\n"); |
| 792 | |
| 793 | dprintk(KERN_INFO "Defaults:\n"); |
| 794 | dprintk(KERN_INFO "\tSlots %d\n" |
| 795 | "\tMaxInlineRead %d\n\tMaxInlineWrite %d\n", |
| 796 | xprt_rdma_slot_table_entries, |
| 797 | xprt_rdma_max_inline_read, xprt_rdma_max_inline_write); |
| 798 | dprintk(KERN_INFO "\tPadding %d\n\tMemreg %d\n", |
| 799 | xprt_rdma_inline_write_padding, xprt_rdma_memreg_strategy); |
| 800 | |
| 801 | #ifdef RPC_DEBUG |
| 802 | if (!sunrpc_table_header) |
| 803 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
| 804 | #endif |
| 805 | return 0; |
| 806 | } |
| 807 | |
| 808 | module_init(xprt_rdma_init); |
| 809 | module_exit(xprt_rdma_cleanup); |