| 1 | /* |
| 2 | * linux/net/sunrpc/xprtsock.c |
| 3 | * |
| 4 | * Client-side transport implementation for sockets. |
| 5 | * |
| 6 | * TCP callback races fixes (C) 1998 Red Hat Software <alan@redhat.com> |
| 7 | * TCP send fixes (C) 1998 Red Hat Software <alan@redhat.com> |
| 8 | * TCP NFS related read + write fixes |
| 9 | * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie> |
| 10 | * |
| 11 | * Rewrite of larges part of the code in order to stabilize TCP stuff. |
| 12 | * Fix behaviour when socket buffer is full. |
| 13 | * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no> |
| 14 | * |
| 15 | * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> |
| 16 | */ |
| 17 | |
| 18 | #include <linux/types.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/capability.h> |
| 21 | #include <linux/pagemap.h> |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/socket.h> |
| 24 | #include <linux/in.h> |
| 25 | #include <linux/net.h> |
| 26 | #include <linux/mm.h> |
| 27 | #include <linux/udp.h> |
| 28 | #include <linux/tcp.h> |
| 29 | #include <linux/sunrpc/clnt.h> |
| 30 | #include <linux/sunrpc/sched.h> |
| 31 | #include <linux/file.h> |
| 32 | |
| 33 | #include <net/sock.h> |
| 34 | #include <net/checksum.h> |
| 35 | #include <net/udp.h> |
| 36 | #include <net/tcp.h> |
| 37 | |
| 38 | /* |
| 39 | * xprtsock tunables |
| 40 | */ |
| 41 | unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; |
| 42 | unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE; |
| 43 | |
| 44 | unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; |
| 45 | unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; |
| 46 | |
| 47 | /* |
| 48 | * We can register our own files under /proc/sys/sunrpc by |
| 49 | * calling register_sysctl_table() again. The files in that |
| 50 | * directory become the union of all files registered there. |
| 51 | * |
| 52 | * We simply need to make sure that we don't collide with |
| 53 | * someone else's file names! |
| 54 | */ |
| 55 | |
| 56 | #ifdef RPC_DEBUG |
| 57 | |
| 58 | static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; |
| 59 | static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; |
| 60 | static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; |
| 61 | static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; |
| 62 | |
| 63 | static struct ctl_table_header *sunrpc_table_header; |
| 64 | |
| 65 | /* |
| 66 | * FIXME: changing the UDP slot table size should also resize the UDP |
| 67 | * socket buffers for existing UDP transports |
| 68 | */ |
| 69 | static ctl_table xs_tunables_table[] = { |
| 70 | { |
| 71 | .ctl_name = CTL_SLOTTABLE_UDP, |
| 72 | .procname = "udp_slot_table_entries", |
| 73 | .data = &xprt_udp_slot_table_entries, |
| 74 | .maxlen = sizeof(unsigned int), |
| 75 | .mode = 0644, |
| 76 | .proc_handler = &proc_dointvec_minmax, |
| 77 | .strategy = &sysctl_intvec, |
| 78 | .extra1 = &min_slot_table_size, |
| 79 | .extra2 = &max_slot_table_size |
| 80 | }, |
| 81 | { |
| 82 | .ctl_name = CTL_SLOTTABLE_TCP, |
| 83 | .procname = "tcp_slot_table_entries", |
| 84 | .data = &xprt_tcp_slot_table_entries, |
| 85 | .maxlen = sizeof(unsigned int), |
| 86 | .mode = 0644, |
| 87 | .proc_handler = &proc_dointvec_minmax, |
| 88 | .strategy = &sysctl_intvec, |
| 89 | .extra1 = &min_slot_table_size, |
| 90 | .extra2 = &max_slot_table_size |
| 91 | }, |
| 92 | { |
| 93 | .ctl_name = CTL_MIN_RESVPORT, |
| 94 | .procname = "min_resvport", |
| 95 | .data = &xprt_min_resvport, |
| 96 | .maxlen = sizeof(unsigned int), |
| 97 | .mode = 0644, |
| 98 | .proc_handler = &proc_dointvec_minmax, |
| 99 | .strategy = &sysctl_intvec, |
| 100 | .extra1 = &xprt_min_resvport_limit, |
| 101 | .extra2 = &xprt_max_resvport_limit |
| 102 | }, |
| 103 | { |
| 104 | .ctl_name = CTL_MAX_RESVPORT, |
| 105 | .procname = "max_resvport", |
| 106 | .data = &xprt_max_resvport, |
| 107 | .maxlen = sizeof(unsigned int), |
| 108 | .mode = 0644, |
| 109 | .proc_handler = &proc_dointvec_minmax, |
| 110 | .strategy = &sysctl_intvec, |
| 111 | .extra1 = &xprt_min_resvport_limit, |
| 112 | .extra2 = &xprt_max_resvport_limit |
| 113 | }, |
| 114 | { |
| 115 | .ctl_name = 0, |
| 116 | }, |
| 117 | }; |
| 118 | |
| 119 | static ctl_table sunrpc_table[] = { |
| 120 | { |
| 121 | .ctl_name = CTL_SUNRPC, |
| 122 | .procname = "sunrpc", |
| 123 | .mode = 0555, |
| 124 | .child = xs_tunables_table |
| 125 | }, |
| 126 | { |
| 127 | .ctl_name = 0, |
| 128 | }, |
| 129 | }; |
| 130 | |
| 131 | #endif |
| 132 | |
| 133 | /* |
| 134 | * How many times to try sending a request on a socket before waiting |
| 135 | * for the socket buffer to clear. |
| 136 | */ |
| 137 | #define XS_SENDMSG_RETRY (10U) |
| 138 | |
| 139 | /* |
| 140 | * Time out for an RPC UDP socket connect. UDP socket connects are |
| 141 | * synchronous, but we set a timeout anyway in case of resource |
| 142 | * exhaustion on the local host. |
| 143 | */ |
| 144 | #define XS_UDP_CONN_TO (5U * HZ) |
| 145 | |
| 146 | /* |
| 147 | * Wait duration for an RPC TCP connection to be established. Solaris |
| 148 | * NFS over TCP uses 60 seconds, for example, which is in line with how |
| 149 | * long a server takes to reboot. |
| 150 | */ |
| 151 | #define XS_TCP_CONN_TO (60U * HZ) |
| 152 | |
| 153 | /* |
| 154 | * Wait duration for a reply from the RPC portmapper. |
| 155 | */ |
| 156 | #define XS_BIND_TO (60U * HZ) |
| 157 | |
| 158 | /* |
| 159 | * Delay if a UDP socket connect error occurs. This is most likely some |
| 160 | * kind of resource problem on the local host. |
| 161 | */ |
| 162 | #define XS_UDP_REEST_TO (2U * HZ) |
| 163 | |
| 164 | /* |
| 165 | * The reestablish timeout allows clients to delay for a bit before attempting |
| 166 | * to reconnect to a server that just dropped our connection. |
| 167 | * |
| 168 | * We implement an exponential backoff when trying to reestablish a TCP |
| 169 | * transport connection with the server. Some servers like to drop a TCP |
| 170 | * connection when they are overworked, so we start with a short timeout and |
| 171 | * increase over time if the server is down or not responding. |
| 172 | */ |
| 173 | #define XS_TCP_INIT_REEST_TO (3U * HZ) |
| 174 | #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) |
| 175 | |
| 176 | /* |
| 177 | * TCP idle timeout; client drops the transport socket if it is idle |
| 178 | * for this long. Note that we also timeout UDP sockets to prevent |
| 179 | * holding port numbers when there is no RPC traffic. |
| 180 | */ |
| 181 | #define XS_IDLE_DISC_TO (5U * 60 * HZ) |
| 182 | |
| 183 | #ifdef RPC_DEBUG |
| 184 | # undef RPC_DEBUG_DATA |
| 185 | # define RPCDBG_FACILITY RPCDBG_TRANS |
| 186 | #endif |
| 187 | |
| 188 | #ifdef RPC_DEBUG_DATA |
| 189 | static void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
| 190 | { |
| 191 | u8 *buf = (u8 *) packet; |
| 192 | int j; |
| 193 | |
| 194 | dprintk("RPC: %s\n", msg); |
| 195 | for (j = 0; j < count && j < 128; j += 4) { |
| 196 | if (!(j & 31)) { |
| 197 | if (j) |
| 198 | dprintk("\n"); |
| 199 | dprintk("0x%04x ", j); |
| 200 | } |
| 201 | dprintk("%02x%02x%02x%02x ", |
| 202 | buf[j], buf[j+1], buf[j+2], buf[j+3]); |
| 203 | } |
| 204 | dprintk("\n"); |
| 205 | } |
| 206 | #else |
| 207 | static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
| 208 | { |
| 209 | /* NOP */ |
| 210 | } |
| 211 | #endif |
| 212 | |
| 213 | struct sock_xprt { |
| 214 | struct rpc_xprt xprt; |
| 215 | |
| 216 | /* |
| 217 | * Network layer |
| 218 | */ |
| 219 | struct socket * sock; |
| 220 | struct sock * inet; |
| 221 | |
| 222 | /* |
| 223 | * State of TCP reply receive |
| 224 | */ |
| 225 | __be32 tcp_fraghdr, |
| 226 | tcp_xid; |
| 227 | |
| 228 | u32 tcp_offset, |
| 229 | tcp_reclen; |
| 230 | |
| 231 | unsigned long tcp_copied, |
| 232 | tcp_flags; |
| 233 | |
| 234 | /* |
| 235 | * Connection of transports |
| 236 | */ |
| 237 | struct delayed_work connect_worker; |
| 238 | struct sockaddr_storage addr; |
| 239 | unsigned short port; |
| 240 | |
| 241 | /* |
| 242 | * UDP socket buffer size parameters |
| 243 | */ |
| 244 | size_t rcvsize, |
| 245 | sndsize; |
| 246 | |
| 247 | /* |
| 248 | * Saved socket callback addresses |
| 249 | */ |
| 250 | void (*old_data_ready)(struct sock *, int); |
| 251 | void (*old_state_change)(struct sock *); |
| 252 | void (*old_write_space)(struct sock *); |
| 253 | }; |
| 254 | |
| 255 | /* |
| 256 | * TCP receive state flags |
| 257 | */ |
| 258 | #define TCP_RCV_LAST_FRAG (1UL << 0) |
| 259 | #define TCP_RCV_COPY_FRAGHDR (1UL << 1) |
| 260 | #define TCP_RCV_COPY_XID (1UL << 2) |
| 261 | #define TCP_RCV_COPY_DATA (1UL << 3) |
| 262 | |
| 263 | static void xs_format_peer_addresses(struct rpc_xprt *xprt) |
| 264 | { |
| 265 | struct sockaddr_in *addr = (struct sockaddr_in *) &xprt->addr; |
| 266 | char *buf; |
| 267 | |
| 268 | buf = kzalloc(20, GFP_KERNEL); |
| 269 | if (buf) { |
| 270 | snprintf(buf, 20, "%u.%u.%u.%u", |
| 271 | NIPQUAD(addr->sin_addr.s_addr)); |
| 272 | } |
| 273 | xprt->address_strings[RPC_DISPLAY_ADDR] = buf; |
| 274 | |
| 275 | buf = kzalloc(8, GFP_KERNEL); |
| 276 | if (buf) { |
| 277 | snprintf(buf, 8, "%u", |
| 278 | ntohs(addr->sin_port)); |
| 279 | } |
| 280 | xprt->address_strings[RPC_DISPLAY_PORT] = buf; |
| 281 | |
| 282 | if (xprt->prot == IPPROTO_UDP) |
| 283 | xprt->address_strings[RPC_DISPLAY_PROTO] = "udp"; |
| 284 | else |
| 285 | xprt->address_strings[RPC_DISPLAY_PROTO] = "tcp"; |
| 286 | |
| 287 | buf = kzalloc(48, GFP_KERNEL); |
| 288 | if (buf) { |
| 289 | snprintf(buf, 48, "addr=%u.%u.%u.%u port=%u proto=%s", |
| 290 | NIPQUAD(addr->sin_addr.s_addr), |
| 291 | ntohs(addr->sin_port), |
| 292 | xprt->prot == IPPROTO_UDP ? "udp" : "tcp"); |
| 293 | } |
| 294 | xprt->address_strings[RPC_DISPLAY_ALL] = buf; |
| 295 | } |
| 296 | |
| 297 | static void xs_free_peer_addresses(struct rpc_xprt *xprt) |
| 298 | { |
| 299 | kfree(xprt->address_strings[RPC_DISPLAY_ADDR]); |
| 300 | kfree(xprt->address_strings[RPC_DISPLAY_PORT]); |
| 301 | kfree(xprt->address_strings[RPC_DISPLAY_ALL]); |
| 302 | } |
| 303 | |
| 304 | #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) |
| 305 | |
| 306 | static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) |
| 307 | { |
| 308 | struct msghdr msg = { |
| 309 | .msg_name = addr, |
| 310 | .msg_namelen = addrlen, |
| 311 | .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), |
| 312 | }; |
| 313 | struct kvec iov = { |
| 314 | .iov_base = vec->iov_base + base, |
| 315 | .iov_len = vec->iov_len - base, |
| 316 | }; |
| 317 | |
| 318 | if (iov.iov_len != 0) |
| 319 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); |
| 320 | return kernel_sendmsg(sock, &msg, NULL, 0, 0); |
| 321 | } |
| 322 | |
| 323 | static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) |
| 324 | { |
| 325 | struct page **ppage; |
| 326 | unsigned int remainder; |
| 327 | int err, sent = 0; |
| 328 | |
| 329 | remainder = xdr->page_len - base; |
| 330 | base += xdr->page_base; |
| 331 | ppage = xdr->pages + (base >> PAGE_SHIFT); |
| 332 | base &= ~PAGE_MASK; |
| 333 | for(;;) { |
| 334 | unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); |
| 335 | int flags = XS_SENDMSG_FLAGS; |
| 336 | |
| 337 | remainder -= len; |
| 338 | if (remainder != 0 || more) |
| 339 | flags |= MSG_MORE; |
| 340 | err = sock->ops->sendpage(sock, *ppage, base, len, flags); |
| 341 | if (remainder == 0 || err != len) |
| 342 | break; |
| 343 | sent += err; |
| 344 | ppage++; |
| 345 | base = 0; |
| 346 | } |
| 347 | if (sent == 0) |
| 348 | return err; |
| 349 | if (err > 0) |
| 350 | sent += err; |
| 351 | return sent; |
| 352 | } |
| 353 | |
| 354 | /** |
| 355 | * xs_sendpages - write pages directly to a socket |
| 356 | * @sock: socket to send on |
| 357 | * @addr: UDP only -- address of destination |
| 358 | * @addrlen: UDP only -- length of destination address |
| 359 | * @xdr: buffer containing this request |
| 360 | * @base: starting position in the buffer |
| 361 | * |
| 362 | */ |
| 363 | static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) |
| 364 | { |
| 365 | unsigned int remainder = xdr->len - base; |
| 366 | int err, sent = 0; |
| 367 | |
| 368 | if (unlikely(!sock)) |
| 369 | return -ENOTCONN; |
| 370 | |
| 371 | clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); |
| 372 | if (base != 0) { |
| 373 | addr = NULL; |
| 374 | addrlen = 0; |
| 375 | } |
| 376 | |
| 377 | if (base < xdr->head[0].iov_len || addr != NULL) { |
| 378 | unsigned int len = xdr->head[0].iov_len - base; |
| 379 | remainder -= len; |
| 380 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); |
| 381 | if (remainder == 0 || err != len) |
| 382 | goto out; |
| 383 | sent += err; |
| 384 | base = 0; |
| 385 | } else |
| 386 | base -= xdr->head[0].iov_len; |
| 387 | |
| 388 | if (base < xdr->page_len) { |
| 389 | unsigned int len = xdr->page_len - base; |
| 390 | remainder -= len; |
| 391 | err = xs_send_pagedata(sock, xdr, base, remainder != 0); |
| 392 | if (remainder == 0 || err != len) |
| 393 | goto out; |
| 394 | sent += err; |
| 395 | base = 0; |
| 396 | } else |
| 397 | base -= xdr->page_len; |
| 398 | |
| 399 | if (base >= xdr->tail[0].iov_len) |
| 400 | return sent; |
| 401 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); |
| 402 | out: |
| 403 | if (sent == 0) |
| 404 | return err; |
| 405 | if (err > 0) |
| 406 | sent += err; |
| 407 | return sent; |
| 408 | } |
| 409 | |
| 410 | /** |
| 411 | * xs_nospace - place task on wait queue if transmit was incomplete |
| 412 | * @task: task to put to sleep |
| 413 | * |
| 414 | */ |
| 415 | static void xs_nospace(struct rpc_task *task) |
| 416 | { |
| 417 | struct rpc_rqst *req = task->tk_rqstp; |
| 418 | struct rpc_xprt *xprt = req->rq_xprt; |
| 419 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| 420 | |
| 421 | dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
| 422 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, |
| 423 | req->rq_slen); |
| 424 | |
| 425 | if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { |
| 426 | /* Protect against races with write_space */ |
| 427 | spin_lock_bh(&xprt->transport_lock); |
| 428 | |
| 429 | /* Don't race with disconnect */ |
| 430 | if (!xprt_connected(xprt)) |
| 431 | task->tk_status = -ENOTCONN; |
| 432 | else if (test_bit(SOCK_NOSPACE, &transport->sock->flags)) |
| 433 | xprt_wait_for_buffer_space(task); |
| 434 | |
| 435 | spin_unlock_bh(&xprt->transport_lock); |
| 436 | } else |
| 437 | /* Keep holding the socket if it is blocked */ |
| 438 | rpc_delay(task, HZ>>4); |
| 439 | } |
| 440 | |
| 441 | /** |
| 442 | * xs_udp_send_request - write an RPC request to a UDP socket |
| 443 | * @task: address of RPC task that manages the state of an RPC request |
| 444 | * |
| 445 | * Return values: |
| 446 | * 0: The request has been sent |
| 447 | * EAGAIN: The socket was blocked, please call again later to |
| 448 | * complete the request |
| 449 | * ENOTCONN: Caller needs to invoke connect logic then call again |
| 450 | * other: Some other error occured, the request was not sent |
| 451 | */ |
| 452 | static int xs_udp_send_request(struct rpc_task *task) |
| 453 | { |
| 454 | struct rpc_rqst *req = task->tk_rqstp; |
| 455 | struct rpc_xprt *xprt = req->rq_xprt; |
| 456 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| 457 | struct xdr_buf *xdr = &req->rq_snd_buf; |
| 458 | int status; |
| 459 | |
| 460 | xs_pktdump("packet data:", |
| 461 | req->rq_svec->iov_base, |
| 462 | req->rq_svec->iov_len); |
| 463 | |
| 464 | req->rq_xtime = jiffies; |
| 465 | status = xs_sendpages(transport->sock, |
| 466 | (struct sockaddr *) &xprt->addr, |
| 467 | xprt->addrlen, xdr, |
| 468 | req->rq_bytes_sent); |
| 469 | |
| 470 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
| 471 | xdr->len - req->rq_bytes_sent, status); |
| 472 | |
| 473 | if (likely(status >= (int) req->rq_slen)) |
| 474 | return 0; |
| 475 | |
| 476 | /* Still some bytes left; set up for a retry later. */ |
| 477 | if (status > 0) |
| 478 | status = -EAGAIN; |
| 479 | |
| 480 | switch (status) { |
| 481 | case -ENETUNREACH: |
| 482 | case -EPIPE: |
| 483 | case -ECONNREFUSED: |
| 484 | /* When the server has died, an ICMP port unreachable message |
| 485 | * prompts ECONNREFUSED. */ |
| 486 | break; |
| 487 | case -EAGAIN: |
| 488 | xs_nospace(task); |
| 489 | break; |
| 490 | default: |
| 491 | dprintk("RPC: sendmsg returned unrecognized error %d\n", |
| 492 | -status); |
| 493 | break; |
| 494 | } |
| 495 | |
| 496 | return status; |
| 497 | } |
| 498 | |
| 499 | static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) |
| 500 | { |
| 501 | u32 reclen = buf->len - sizeof(rpc_fraghdr); |
| 502 | rpc_fraghdr *base = buf->head[0].iov_base; |
| 503 | *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); |
| 504 | } |
| 505 | |
| 506 | /** |
| 507 | * xs_tcp_send_request - write an RPC request to a TCP socket |
| 508 | * @task: address of RPC task that manages the state of an RPC request |
| 509 | * |
| 510 | * Return values: |
| 511 | * 0: The request has been sent |
| 512 | * EAGAIN: The socket was blocked, please call again later to |
| 513 | * complete the request |
| 514 | * ENOTCONN: Caller needs to invoke connect logic then call again |
| 515 | * other: Some other error occured, the request was not sent |
| 516 | * |
| 517 | * XXX: In the case of soft timeouts, should we eventually give up |
| 518 | * if sendmsg is not able to make progress? |
| 519 | */ |
| 520 | static int xs_tcp_send_request(struct rpc_task *task) |
| 521 | { |
| 522 | struct rpc_rqst *req = task->tk_rqstp; |
| 523 | struct rpc_xprt *xprt = req->rq_xprt; |
| 524 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| 525 | struct xdr_buf *xdr = &req->rq_snd_buf; |
| 526 | int status; |
| 527 | unsigned int retry = 0; |
| 528 | |
| 529 | xs_encode_tcp_record_marker(&req->rq_snd_buf); |
| 530 | |
| 531 | xs_pktdump("packet data:", |
| 532 | req->rq_svec->iov_base, |
| 533 | req->rq_svec->iov_len); |
| 534 | |
| 535 | /* Continue transmitting the packet/record. We must be careful |
| 536 | * to cope with writespace callbacks arriving _after_ we have |
| 537 | * called sendmsg(). */ |
| 538 | while (1) { |
| 539 | req->rq_xtime = jiffies; |
| 540 | status = xs_sendpages(transport->sock, |
| 541 | NULL, 0, xdr, req->rq_bytes_sent); |
| 542 | |
| 543 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
| 544 | xdr->len - req->rq_bytes_sent, status); |
| 545 | |
| 546 | if (unlikely(status < 0)) |
| 547 | break; |
| 548 | |
| 549 | /* If we've sent the entire packet, immediately |
| 550 | * reset the count of bytes sent. */ |
| 551 | req->rq_bytes_sent += status; |
| 552 | task->tk_bytes_sent += status; |
| 553 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
| 554 | req->rq_bytes_sent = 0; |
| 555 | return 0; |
| 556 | } |
| 557 | |
| 558 | status = -EAGAIN; |
| 559 | if (retry++ > XS_SENDMSG_RETRY) |
| 560 | break; |
| 561 | } |
| 562 | |
| 563 | switch (status) { |
| 564 | case -EAGAIN: |
| 565 | xs_nospace(task); |
| 566 | break; |
| 567 | case -ECONNREFUSED: |
| 568 | case -ECONNRESET: |
| 569 | case -ENOTCONN: |
| 570 | case -EPIPE: |
| 571 | status = -ENOTCONN; |
| 572 | break; |
| 573 | default: |
| 574 | dprintk("RPC: sendmsg returned unrecognized error %d\n", |
| 575 | -status); |
| 576 | xprt_disconnect(xprt); |
| 577 | break; |
| 578 | } |
| 579 | |
| 580 | return status; |
| 581 | } |
| 582 | |
| 583 | /** |
| 584 | * xs_tcp_release_xprt - clean up after a tcp transmission |
| 585 | * @xprt: transport |
| 586 | * @task: rpc task |
| 587 | * |
| 588 | * This cleans up if an error causes us to abort the transmission of a request. |
| 589 | * In this case, the socket may need to be reset in order to avoid confusing |
| 590 | * the server. |
| 591 | */ |
| 592 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) |
| 593 | { |
| 594 | struct rpc_rqst *req; |
| 595 | |
| 596 | if (task != xprt->snd_task) |
| 597 | return; |
| 598 | if (task == NULL) |
| 599 | goto out_release; |
| 600 | req = task->tk_rqstp; |
| 601 | if (req->rq_bytes_sent == 0) |
| 602 | goto out_release; |
| 603 | if (req->rq_bytes_sent == req->rq_snd_buf.len) |
| 604 | goto out_release; |
| 605 | set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); |
| 606 | out_release: |
| 607 | xprt_release_xprt(xprt, task); |
| 608 | } |
| 609 | |
| 610 | /** |
| 611 | * xs_close - close a socket |
| 612 | * @xprt: transport |
| 613 | * |
| 614 | * This is used when all requests are complete; ie, no DRC state remains |
| 615 | * on the server we want to save. |
| 616 | */ |
| 617 | static void xs_close(struct rpc_xprt *xprt) |
| 618 | { |
| 619 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| 620 | struct socket *sock = transport->sock; |
| 621 | struct sock *sk = transport->inet; |
| 622 | |
| 623 | if (!sk) |
| 624 | goto clear_close_wait; |
| 625 | |
| 626 | dprintk("RPC: xs_close xprt %p\n", xprt); |
| 627 | |
| 628 | write_lock_bh(&sk->sk_callback_lock); |
| 629 | transport->inet = NULL; |
| 630 | transport->sock = NULL; |
| 631 | |
| 632 | sk->sk_user_data = NULL; |
| 633 | sk->sk_data_ready = transport->old_data_ready; |
| 634 | sk->sk_state_change = transport->old_state_change; |
| 635 | sk->sk_write_space = transport->old_write_space; |
| 636 | write_unlock_bh(&sk->sk_callback_lock); |
| 637 | |
| 638 | sk->sk_no_check = 0; |
| 639 | |
| 640 | sock_release(sock); |
| 641 | clear_close_wait: |
| 642 | smp_mb__before_clear_bit(); |
| 643 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); |
| 644 | smp_mb__after_clear_bit(); |
| 645 | } |
| 646 | |
| 647 | /** |
| 648 | * xs_destroy - prepare to shutdown a transport |
| 649 | * @xprt: doomed transport |
| 650 | * |
| 651 | */ |
| 652 | static void xs_destroy(struct rpc_xprt *xprt) |
| 653 | { |
| 654 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| 655 | |
| 656 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
| 657 | |
| 658 | cancel_rearming_delayed_work(&transport->connect_worker); |
| 659 | |
| 660 | xprt_disconnect(xprt); |
| 661 | xs_close(xprt); |
| 662 | xs_free_peer_addresses(xprt); |
| 663 | kfree(xprt->slot); |
| 664 | kfree(xprt); |
| 665 | } |
| 666 | |
| 667 | static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
| 668 | { |
| 669 | return (struct rpc_xprt *) sk->sk_user_data; |
| 670 | } |
| 671 | |
| 672 | /** |
| 673 | * xs_udp_data_ready - "data ready" callback for UDP sockets |
| 674 | * @sk: socket with data to read |
| 675 | * @len: how much data to read |
| 676 | * |
| 677 | */ |
| 678 | static void xs_udp_data_ready(struct sock *sk, int len) |
| 679 | { |
| 680 | struct rpc_task *task; |
| 681 | struct rpc_xprt *xprt; |
| 682 | struct rpc_rqst *rovr; |
| 683 | struct sk_buff *skb; |
| 684 | int err, repsize, copied; |
| 685 | u32 _xid; |
| 686 | __be32 *xp; |
| 687 | |
| 688 | read_lock(&sk->sk_callback_lock); |
| 689 | dprintk("RPC: xs_udp_data_ready...\n"); |
| 690 | if (!(xprt = xprt_from_sock(sk))) |
| 691 | goto out; |
| 692 | |
| 693 | if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) |
| 694 | goto out; |
| 695 | |
| 696 | if (xprt->shutdown) |
| 697 | goto dropit; |
| 698 | |
| 699 | repsize = skb->len - sizeof(struct udphdr); |
| 700 | if (repsize < 4) { |
| 701 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
| 702 | goto dropit; |
| 703 | } |
| 704 | |
| 705 | /* Copy the XID from the skb... */ |
| 706 | xp = skb_header_pointer(skb, sizeof(struct udphdr), |
| 707 | sizeof(_xid), &_xid); |
| 708 | if (xp == NULL) |
| 709 | goto dropit; |
| 710 | |
| 711 | /* Look up and lock the request corresponding to the given XID */ |
| 712 | spin_lock(&xprt->transport_lock); |
| 713 | rovr = xprt_lookup_rqst(xprt, *xp); |
| 714 | if (!rovr) |
| 715 | goto out_unlock; |
| 716 | task = rovr->rq_task; |
| 717 | |
| 718 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
| 719 | copied = repsize; |
| 720 | |
| 721 | /* Suck it into the iovec, verify checksum if not done by hw. */ |
| 722 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) |
| 723 | goto out_unlock; |
| 724 | |
| 725 | /* Something worked... */ |
| 726 | dst_confirm(skb->dst); |
| 727 | |
| 728 | xprt_adjust_cwnd(task, copied); |
| 729 | xprt_update_rtt(task); |
| 730 | xprt_complete_rqst(task, copied); |
| 731 | |
| 732 | out_unlock: |
| 733 | spin_unlock(&xprt->transport_lock); |
| 734 | dropit: |
| 735 | skb_free_datagram(sk, skb); |
| 736 | out: |
| 737 | read_unlock(&sk->sk_callback_lock); |
| 738 | } |
| 739 | |
| 740 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
| 741 | { |
| 742 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| 743 | size_t len, used; |
| 744 | char *p; |
| 745 | |
| 746 | p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; |
| 747 | len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; |
| 748 | used = xdr_skb_read_bits(desc, p, len); |
| 749 | transport->tcp_offset += used; |
| 750 | if (used != len) |
| 751 | return; |
| 752 | |
| 753 | transport->tcp_reclen = ntohl(transport->tcp_fraghdr); |
| 754 | if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) |
| 755 | transport->tcp_flags |= TCP_RCV_LAST_FRAG; |
| 756 | else |
| 757 | transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; |
| 758 | transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
| 759 | |
| 760 | transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; |
| 761 | transport->tcp_offset = 0; |
| 762 | |
| 763 | /* Sanity check of the record length */ |
| 764 | if (unlikely(transport->tcp_reclen < 4)) { |
| 765 | dprintk("RPC: invalid TCP record fragment length\n"); |
| 766 | xprt_disconnect(xprt); |
| 767 | return; |
| 768 | } |
| 769 | dprintk("RPC: reading TCP record fragment of length %d\n", |
| 770 | transport->tcp_reclen); |
| 771 | } |
| 772 | |
| 773 | static void xs_tcp_check_fraghdr(struct sock_xprt *transport) |
| 774 | { |
| 775 | if (transport->tcp_offset == transport->tcp_reclen) { |
| 776 | transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; |
| 777 | transport->tcp_offset = 0; |
| 778 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { |
| 779 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
| 780 | transport->tcp_flags |= TCP_RCV_COPY_XID; |
| 781 | transport->tcp_copied = 0; |
| 782 | } |
| 783 | } |
| 784 | } |
| 785 | |
| 786 | static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
| 787 | { |
| 788 | size_t len, used; |
| 789 | char *p; |
| 790 | |
| 791 | len = sizeof(transport->tcp_xid) - transport->tcp_offset; |
| 792 | dprintk("RPC: reading XID (%Zu bytes)\n", len); |
| 793 | p = ((char *) &transport->tcp_xid) + transport->tcp_offset; |
| 794 | used = xdr_skb_read_bits(desc, p, len); |
| 795 | transport->tcp_offset += used; |
| 796 | if (used != len) |
| 797 | return; |
| 798 | transport->tcp_flags &= ~TCP_RCV_COPY_XID; |
| 799 | transport->tcp_flags |= TCP_RCV_COPY_DATA; |
| 800 | transport->tcp_copied = 4; |
| 801 | dprintk("RPC: reading reply for XID %08x\n", |
| 802 | ntohl(transport->tcp_xid)); |
| 803 | xs_tcp_check_fraghdr(transport); |
| 804 | } |
| 805 | |
| 806 | static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
| 807 | { |
| 808 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| 809 | struct rpc_rqst *req; |
| 810 | struct xdr_buf *rcvbuf; |
| 811 | size_t len; |
| 812 | ssize_t r; |
| 813 | |
| 814 | /* Find and lock the request corresponding to this xid */ |
| 815 | spin_lock(&xprt->transport_lock); |
| 816 | req = xprt_lookup_rqst(xprt, transport->tcp_xid); |
| 817 | if (!req) { |
| 818 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
| 819 | dprintk("RPC: XID %08x request not found!\n", |
| 820 | ntohl(transport->tcp_xid)); |
| 821 | spin_unlock(&xprt->transport_lock); |
| 822 | return; |
| 823 | } |
| 824 | |
| 825 | rcvbuf = &req->rq_private_buf; |
| 826 | len = desc->count; |
| 827 | if (len > transport->tcp_reclen - transport->tcp_offset) { |
| 828 | struct xdr_skb_reader my_desc; |
| 829 | |
| 830 | len = transport->tcp_reclen - transport->tcp_offset; |
| 831 | memcpy(&my_desc, desc, sizeof(my_desc)); |
| 832 | my_desc.count = len; |
| 833 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
| 834 | &my_desc, xdr_skb_read_bits); |
| 835 | desc->count -= r; |
| 836 | desc->offset += r; |
| 837 | } else |
| 838 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
| 839 | desc, xdr_skb_read_bits); |
| 840 | |
| 841 | if (r > 0) { |
| 842 | transport->tcp_copied += r; |
| 843 | transport->tcp_offset += r; |
| 844 | } |
| 845 | if (r != len) { |
| 846 | /* Error when copying to the receive buffer, |
| 847 | * usually because we weren't able to allocate |
| 848 | * additional buffer pages. All we can do now |
| 849 | * is turn off TCP_RCV_COPY_DATA, so the request |
| 850 | * will not receive any additional updates, |
| 851 | * and time out. |
| 852 | * Any remaining data from this record will |
| 853 | * be discarded. |
| 854 | */ |
| 855 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
| 856 | dprintk("RPC: XID %08x truncated request\n", |
| 857 | ntohl(transport->tcp_xid)); |
| 858 | dprintk("RPC: xprt = %p, tcp_copied = %lu, " |
| 859 | "tcp_offset = %u, tcp_reclen = %u\n", |
| 860 | xprt, transport->tcp_copied, |
| 861 | transport->tcp_offset, transport->tcp_reclen); |
| 862 | goto out; |
| 863 | } |
| 864 | |
| 865 | dprintk("RPC: XID %08x read %Zd bytes\n", |
| 866 | ntohl(transport->tcp_xid), r); |
| 867 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " |
| 868 | "tcp_reclen = %u\n", xprt, transport->tcp_copied, |
| 869 | transport->tcp_offset, transport->tcp_reclen); |
| 870 | |
| 871 | if (transport->tcp_copied == req->rq_private_buf.buflen) |
| 872 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
| 873 | else if (transport->tcp_offset == transport->tcp_reclen) { |
| 874 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) |
| 875 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
| 876 | } |
| 877 | |
| 878 | out: |
| 879 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
| 880 | xprt_complete_rqst(req->rq_task, transport->tcp_copied); |
| 881 | spin_unlock(&xprt->transport_lock); |
| 882 | xs_tcp_check_fraghdr(transport); |
| 883 | } |
| 884 | |
| 885 | static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
| 886 | { |
| 887 | size_t len; |
| 888 | |
| 889 | len = transport->tcp_reclen - transport->tcp_offset; |
| 890 | if (len > desc->count) |
| 891 | len = desc->count; |
| 892 | desc->count -= len; |
| 893 | desc->offset += len; |
| 894 | transport->tcp_offset += len; |
| 895 | dprintk("RPC: discarded %Zu bytes\n", len); |
| 896 | xs_tcp_check_fraghdr(transport); |
| 897 | } |
| 898 | |
| 899 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
| 900 | { |
| 901 | struct rpc_xprt *xprt = rd_desc->arg.data; |
| 902 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| 903 | struct xdr_skb_reader desc = { |
| 904 | .skb = skb, |
| 905 | .offset = offset, |
| 906 | .count = len, |
| 907 | }; |
| 908 | |
| 909 | dprintk("RPC: xs_tcp_data_recv started\n"); |
| 910 | do { |
| 911 | /* Read in a new fragment marker if necessary */ |
| 912 | /* Can we ever really expect to get completely empty fragments? */ |
| 913 | if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { |
| 914 | xs_tcp_read_fraghdr(xprt, &desc); |
| 915 | continue; |
| 916 | } |
| 917 | /* Read in the xid if necessary */ |
| 918 | if (transport->tcp_flags & TCP_RCV_COPY_XID) { |
| 919 | xs_tcp_read_xid(transport, &desc); |
| 920 | continue; |
| 921 | } |
| 922 | /* Read in the request data */ |
| 923 | if (transport->tcp_flags & TCP_RCV_COPY_DATA) { |
| 924 | xs_tcp_read_request(xprt, &desc); |
| 925 | continue; |
| 926 | } |
| 927 | /* Skip over any trailing bytes on short reads */ |
| 928 | xs_tcp_read_discard(transport, &desc); |
| 929 | } while (desc.count); |
| 930 | dprintk("RPC: xs_tcp_data_recv done\n"); |
| 931 | return len - desc.count; |
| 932 | } |
| 933 | |
| 934 | /** |
| 935 | * xs_tcp_data_ready - "data ready" callback for TCP sockets |
| 936 | * @sk: socket with data to read |
| 937 | * @bytes: how much data to read |
| 938 | * |
| 939 | */ |
| 940 | static void xs_tcp_data_ready(struct sock *sk, int bytes) |
| 941 | { |
| 942 | struct rpc_xprt *xprt; |
| 943 | read_descriptor_t rd_desc; |
| 944 | |
| 945 | dprintk("RPC: xs_tcp_data_ready...\n"); |
| 946 | |
| 947 | read_lock(&sk->sk_callback_lock); |
| 948 | if (!(xprt = xprt_from_sock(sk))) |
| 949 | goto out; |
| 950 | if (xprt->shutdown) |
| 951 | goto out; |
| 952 | |
| 953 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
| 954 | rd_desc.arg.data = xprt; |
| 955 | rd_desc.count = 65536; |
| 956 | tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); |
| 957 | out: |
| 958 | read_unlock(&sk->sk_callback_lock); |
| 959 | } |
| 960 | |
| 961 | /** |
| 962 | * xs_tcp_state_change - callback to handle TCP socket state changes |
| 963 | * @sk: socket whose state has changed |
| 964 | * |
| 965 | */ |
| 966 | static void xs_tcp_state_change(struct sock *sk) |
| 967 | { |
| 968 | struct rpc_xprt *xprt; |
| 969 | |
| 970 | read_lock(&sk->sk_callback_lock); |
| 971 | if (!(xprt = xprt_from_sock(sk))) |
| 972 | goto out; |
| 973 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
| 974 | dprintk("RPC: state %x conn %d dead %d zapped %d\n", |
| 975 | sk->sk_state, xprt_connected(xprt), |
| 976 | sock_flag(sk, SOCK_DEAD), |
| 977 | sock_flag(sk, SOCK_ZAPPED)); |
| 978 | |
| 979 | switch (sk->sk_state) { |
| 980 | case TCP_ESTABLISHED: |
| 981 | spin_lock_bh(&xprt->transport_lock); |
| 982 | if (!xprt_test_and_set_connected(xprt)) { |
| 983 | struct sock_xprt *transport = container_of(xprt, |
| 984 | struct sock_xprt, xprt); |
| 985 | |
| 986 | /* Reset TCP record info */ |
| 987 | transport->tcp_offset = 0; |
| 988 | transport->tcp_reclen = 0; |
| 989 | transport->tcp_copied = 0; |
| 990 | transport->tcp_flags = |
| 991 | TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; |
| 992 | |
| 993 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
| 994 | xprt_wake_pending_tasks(xprt, 0); |
| 995 | } |
| 996 | spin_unlock_bh(&xprt->transport_lock); |
| 997 | break; |
| 998 | case TCP_SYN_SENT: |
| 999 | case TCP_SYN_RECV: |
| 1000 | break; |
| 1001 | case TCP_CLOSE_WAIT: |
| 1002 | /* Try to schedule an autoclose RPC calls */ |
| 1003 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); |
| 1004 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) |
| 1005 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
| 1006 | default: |
| 1007 | xprt_disconnect(xprt); |
| 1008 | } |
| 1009 | out: |
| 1010 | read_unlock(&sk->sk_callback_lock); |
| 1011 | } |
| 1012 | |
| 1013 | /** |
| 1014 | * xs_udp_write_space - callback invoked when socket buffer space |
| 1015 | * becomes available |
| 1016 | * @sk: socket whose state has changed |
| 1017 | * |
| 1018 | * Called when more output buffer space is available for this socket. |
| 1019 | * We try not to wake our writers until they can make "significant" |
| 1020 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
| 1021 | * with a bunch of small requests. |
| 1022 | */ |
| 1023 | static void xs_udp_write_space(struct sock *sk) |
| 1024 | { |
| 1025 | read_lock(&sk->sk_callback_lock); |
| 1026 | |
| 1027 | /* from net/core/sock.c:sock_def_write_space */ |
| 1028 | if (sock_writeable(sk)) { |
| 1029 | struct socket *sock; |
| 1030 | struct rpc_xprt *xprt; |
| 1031 | |
| 1032 | if (unlikely(!(sock = sk->sk_socket))) |
| 1033 | goto out; |
| 1034 | if (unlikely(!(xprt = xprt_from_sock(sk)))) |
| 1035 | goto out; |
| 1036 | if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) |
| 1037 | goto out; |
| 1038 | |
| 1039 | xprt_write_space(xprt); |
| 1040 | } |
| 1041 | |
| 1042 | out: |
| 1043 | read_unlock(&sk->sk_callback_lock); |
| 1044 | } |
| 1045 | |
| 1046 | /** |
| 1047 | * xs_tcp_write_space - callback invoked when socket buffer space |
| 1048 | * becomes available |
| 1049 | * @sk: socket whose state has changed |
| 1050 | * |
| 1051 | * Called when more output buffer space is available for this socket. |
| 1052 | * We try not to wake our writers until they can make "significant" |
| 1053 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
| 1054 | * with a bunch of small requests. |
| 1055 | */ |
| 1056 | static void xs_tcp_write_space(struct sock *sk) |
| 1057 | { |
| 1058 | read_lock(&sk->sk_callback_lock); |
| 1059 | |
| 1060 | /* from net/core/stream.c:sk_stream_write_space */ |
| 1061 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { |
| 1062 | struct socket *sock; |
| 1063 | struct rpc_xprt *xprt; |
| 1064 | |
| 1065 | if (unlikely(!(sock = sk->sk_socket))) |
| 1066 | goto out; |
| 1067 | if (unlikely(!(xprt = xprt_from_sock(sk)))) |
| 1068 | goto out; |
| 1069 | if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) |
| 1070 | goto out; |
| 1071 | |
| 1072 | xprt_write_space(xprt); |
| 1073 | } |
| 1074 | |
| 1075 | out: |
| 1076 | read_unlock(&sk->sk_callback_lock); |
| 1077 | } |
| 1078 | |
| 1079 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
| 1080 | { |
| 1081 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| 1082 | struct sock *sk = transport->inet; |
| 1083 | |
| 1084 | if (transport->rcvsize) { |
| 1085 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
| 1086 | sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
| 1087 | } |
| 1088 | if (transport->sndsize) { |
| 1089 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
| 1090 | sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
| 1091 | sk->sk_write_space(sk); |
| 1092 | } |
| 1093 | } |
| 1094 | |
| 1095 | /** |
| 1096 | * xs_udp_set_buffer_size - set send and receive limits |
| 1097 | * @xprt: generic transport |
| 1098 | * @sndsize: requested size of send buffer, in bytes |
| 1099 | * @rcvsize: requested size of receive buffer, in bytes |
| 1100 | * |
| 1101 | * Set socket send and receive buffer size limits. |
| 1102 | */ |
| 1103 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
| 1104 | { |
| 1105 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| 1106 | |
| 1107 | transport->sndsize = 0; |
| 1108 | if (sndsize) |
| 1109 | transport->sndsize = sndsize + 1024; |
| 1110 | transport->rcvsize = 0; |
| 1111 | if (rcvsize) |
| 1112 | transport->rcvsize = rcvsize + 1024; |
| 1113 | |
| 1114 | xs_udp_do_set_buffer_size(xprt); |
| 1115 | } |
| 1116 | |
| 1117 | /** |
| 1118 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport |
| 1119 | * @task: task that timed out |
| 1120 | * |
| 1121 | * Adjust the congestion window after a retransmit timeout has occurred. |
| 1122 | */ |
| 1123 | static void xs_udp_timer(struct rpc_task *task) |
| 1124 | { |
| 1125 | xprt_adjust_cwnd(task, -ETIMEDOUT); |
| 1126 | } |
| 1127 | |
| 1128 | static unsigned short xs_get_random_port(void) |
| 1129 | { |
| 1130 | unsigned short range = xprt_max_resvport - xprt_min_resvport; |
| 1131 | unsigned short rand = (unsigned short) net_random() % range; |
| 1132 | return rand + xprt_min_resvport; |
| 1133 | } |
| 1134 | |
| 1135 | /** |
| 1136 | * xs_set_port - reset the port number in the remote endpoint address |
| 1137 | * @xprt: generic transport |
| 1138 | * @port: new port number |
| 1139 | * |
| 1140 | */ |
| 1141 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) |
| 1142 | { |
| 1143 | struct sockaddr_in *sap = (struct sockaddr_in *) &xprt->addr; |
| 1144 | |
| 1145 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
| 1146 | |
| 1147 | sap->sin_port = htons(port); |
| 1148 | } |
| 1149 | |
| 1150 | static int xs_bind(struct sock_xprt *transport, struct socket *sock) |
| 1151 | { |
| 1152 | struct sockaddr_in myaddr = { |
| 1153 | .sin_family = AF_INET, |
| 1154 | }; |
| 1155 | struct sockaddr_in *sa; |
| 1156 | int err; |
| 1157 | unsigned short port = transport->port; |
| 1158 | |
| 1159 | if (!transport->xprt.resvport) |
| 1160 | port = 0; |
| 1161 | sa = (struct sockaddr_in *)&transport->addr; |
| 1162 | myaddr.sin_addr = sa->sin_addr; |
| 1163 | do { |
| 1164 | myaddr.sin_port = htons(port); |
| 1165 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, |
| 1166 | sizeof(myaddr)); |
| 1167 | if (!transport->xprt.resvport) |
| 1168 | break; |
| 1169 | if (err == 0) { |
| 1170 | transport->port = port; |
| 1171 | break; |
| 1172 | } |
| 1173 | if (port <= xprt_min_resvport) |
| 1174 | port = xprt_max_resvport; |
| 1175 | else |
| 1176 | port--; |
| 1177 | } while (err == -EADDRINUSE && port != transport->port); |
| 1178 | dprintk("RPC: xs_bind "NIPQUAD_FMT":%u: %s (%d)\n", |
| 1179 | NIPQUAD(myaddr.sin_addr), port, err ? "failed" : "ok", err); |
| 1180 | return err; |
| 1181 | } |
| 1182 | |
| 1183 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 1184 | static struct lock_class_key xs_key[2]; |
| 1185 | static struct lock_class_key xs_slock_key[2]; |
| 1186 | |
| 1187 | static inline void xs_reclassify_socket(struct socket *sock) |
| 1188 | { |
| 1189 | struct sock *sk = sock->sk; |
| 1190 | BUG_ON(sk->sk_lock.owner != NULL); |
| 1191 | switch (sk->sk_family) { |
| 1192 | case AF_INET: |
| 1193 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFS", |
| 1194 | &xs_slock_key[0], "sk_lock-AF_INET-NFS", &xs_key[0]); |
| 1195 | break; |
| 1196 | |
| 1197 | case AF_INET6: |
| 1198 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFS", |
| 1199 | &xs_slock_key[1], "sk_lock-AF_INET6-NFS", &xs_key[1]); |
| 1200 | break; |
| 1201 | |
| 1202 | default: |
| 1203 | BUG(); |
| 1204 | } |
| 1205 | } |
| 1206 | #else |
| 1207 | static inline void xs_reclassify_socket(struct socket *sock) |
| 1208 | { |
| 1209 | } |
| 1210 | #endif |
| 1211 | |
| 1212 | /** |
| 1213 | * xs_udp_connect_worker - set up a UDP socket |
| 1214 | * @work: RPC transport to connect |
| 1215 | * |
| 1216 | * Invoked by a work queue tasklet. |
| 1217 | */ |
| 1218 | static void xs_udp_connect_worker(struct work_struct *work) |
| 1219 | { |
| 1220 | struct sock_xprt *transport = |
| 1221 | container_of(work, struct sock_xprt, connect_worker.work); |
| 1222 | struct rpc_xprt *xprt = &transport->xprt; |
| 1223 | struct socket *sock = transport->sock; |
| 1224 | int err, status = -EIO; |
| 1225 | |
| 1226 | if (xprt->shutdown || !xprt_bound(xprt)) |
| 1227 | goto out; |
| 1228 | |
| 1229 | /* Start by resetting any existing state */ |
| 1230 | xs_close(xprt); |
| 1231 | |
| 1232 | if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { |
| 1233 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); |
| 1234 | goto out; |
| 1235 | } |
| 1236 | xs_reclassify_socket(sock); |
| 1237 | |
| 1238 | if (xs_bind(transport, sock)) { |
| 1239 | sock_release(sock); |
| 1240 | goto out; |
| 1241 | } |
| 1242 | |
| 1243 | dprintk("RPC: worker connecting xprt %p to address: %s\n", |
| 1244 | xprt, xprt->address_strings[RPC_DISPLAY_ALL]); |
| 1245 | |
| 1246 | if (!transport->inet) { |
| 1247 | struct sock *sk = sock->sk; |
| 1248 | |
| 1249 | write_lock_bh(&sk->sk_callback_lock); |
| 1250 | |
| 1251 | sk->sk_user_data = xprt; |
| 1252 | transport->old_data_ready = sk->sk_data_ready; |
| 1253 | transport->old_state_change = sk->sk_state_change; |
| 1254 | transport->old_write_space = sk->sk_write_space; |
| 1255 | sk->sk_data_ready = xs_udp_data_ready; |
| 1256 | sk->sk_write_space = xs_udp_write_space; |
| 1257 | sk->sk_no_check = UDP_CSUM_NORCV; |
| 1258 | sk->sk_allocation = GFP_ATOMIC; |
| 1259 | |
| 1260 | xprt_set_connected(xprt); |
| 1261 | |
| 1262 | /* Reset to new socket */ |
| 1263 | transport->sock = sock; |
| 1264 | transport->inet = sk; |
| 1265 | |
| 1266 | write_unlock_bh(&sk->sk_callback_lock); |
| 1267 | } |
| 1268 | xs_udp_do_set_buffer_size(xprt); |
| 1269 | status = 0; |
| 1270 | out: |
| 1271 | xprt_wake_pending_tasks(xprt, status); |
| 1272 | xprt_clear_connecting(xprt); |
| 1273 | } |
| 1274 | |
| 1275 | /* |
| 1276 | * We need to preserve the port number so the reply cache on the server can |
| 1277 | * find our cached RPC replies when we get around to reconnecting. |
| 1278 | */ |
| 1279 | static void xs_tcp_reuse_connection(struct rpc_xprt *xprt) |
| 1280 | { |
| 1281 | int result; |
| 1282 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| 1283 | struct sockaddr any; |
| 1284 | |
| 1285 | dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); |
| 1286 | |
| 1287 | /* |
| 1288 | * Disconnect the transport socket by doing a connect operation |
| 1289 | * with AF_UNSPEC. This should return immediately... |
| 1290 | */ |
| 1291 | memset(&any, 0, sizeof(any)); |
| 1292 | any.sa_family = AF_UNSPEC; |
| 1293 | result = kernel_connect(transport->sock, &any, sizeof(any), 0); |
| 1294 | if (result) |
| 1295 | dprintk("RPC: AF_UNSPEC connect return code %d\n", |
| 1296 | result); |
| 1297 | } |
| 1298 | |
| 1299 | /** |
| 1300 | * xs_tcp_connect_worker - connect a TCP socket to a remote endpoint |
| 1301 | * @work: RPC transport to connect |
| 1302 | * |
| 1303 | * Invoked by a work queue tasklet. |
| 1304 | */ |
| 1305 | static void xs_tcp_connect_worker(struct work_struct *work) |
| 1306 | { |
| 1307 | struct sock_xprt *transport = |
| 1308 | container_of(work, struct sock_xprt, connect_worker.work); |
| 1309 | struct rpc_xprt *xprt = &transport->xprt; |
| 1310 | struct socket *sock = transport->sock; |
| 1311 | int err, status = -EIO; |
| 1312 | |
| 1313 | if (xprt->shutdown || !xprt_bound(xprt)) |
| 1314 | goto out; |
| 1315 | |
| 1316 | if (!sock) { |
| 1317 | /* start from scratch */ |
| 1318 | if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { |
| 1319 | dprintk("RPC: can't create TCP transport " |
| 1320 | "socket (%d).\n", -err); |
| 1321 | goto out; |
| 1322 | } |
| 1323 | xs_reclassify_socket(sock); |
| 1324 | |
| 1325 | if (xs_bind(transport, sock)) { |
| 1326 | sock_release(sock); |
| 1327 | goto out; |
| 1328 | } |
| 1329 | } else |
| 1330 | /* "close" the socket, preserving the local port */ |
| 1331 | xs_tcp_reuse_connection(xprt); |
| 1332 | |
| 1333 | dprintk("RPC: worker connecting xprt %p to address: %s\n", |
| 1334 | xprt, xprt->address_strings[RPC_DISPLAY_ALL]); |
| 1335 | |
| 1336 | if (!transport->inet) { |
| 1337 | struct sock *sk = sock->sk; |
| 1338 | |
| 1339 | write_lock_bh(&sk->sk_callback_lock); |
| 1340 | |
| 1341 | sk->sk_user_data = xprt; |
| 1342 | transport->old_data_ready = sk->sk_data_ready; |
| 1343 | transport->old_state_change = sk->sk_state_change; |
| 1344 | transport->old_write_space = sk->sk_write_space; |
| 1345 | sk->sk_data_ready = xs_tcp_data_ready; |
| 1346 | sk->sk_state_change = xs_tcp_state_change; |
| 1347 | sk->sk_write_space = xs_tcp_write_space; |
| 1348 | sk->sk_allocation = GFP_ATOMIC; |
| 1349 | |
| 1350 | /* socket options */ |
| 1351 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; |
| 1352 | sock_reset_flag(sk, SOCK_LINGER); |
| 1353 | tcp_sk(sk)->linger2 = 0; |
| 1354 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
| 1355 | |
| 1356 | xprt_clear_connected(xprt); |
| 1357 | |
| 1358 | /* Reset to new socket */ |
| 1359 | transport->sock = sock; |
| 1360 | transport->inet = sk; |
| 1361 | |
| 1362 | write_unlock_bh(&sk->sk_callback_lock); |
| 1363 | } |
| 1364 | |
| 1365 | /* Tell the socket layer to start connecting... */ |
| 1366 | xprt->stat.connect_count++; |
| 1367 | xprt->stat.connect_start = jiffies; |
| 1368 | status = kernel_connect(sock, (struct sockaddr *) &xprt->addr, |
| 1369 | xprt->addrlen, O_NONBLOCK); |
| 1370 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
| 1371 | xprt, -status, xprt_connected(xprt), |
| 1372 | sock->sk->sk_state); |
| 1373 | if (status < 0) { |
| 1374 | switch (status) { |
| 1375 | case -EINPROGRESS: |
| 1376 | case -EALREADY: |
| 1377 | goto out_clear; |
| 1378 | case -ECONNREFUSED: |
| 1379 | case -ECONNRESET: |
| 1380 | /* retry with existing socket, after a delay */ |
| 1381 | break; |
| 1382 | default: |
| 1383 | /* get rid of existing socket, and retry */ |
| 1384 | xs_close(xprt); |
| 1385 | break; |
| 1386 | } |
| 1387 | } |
| 1388 | out: |
| 1389 | xprt_wake_pending_tasks(xprt, status); |
| 1390 | out_clear: |
| 1391 | xprt_clear_connecting(xprt); |
| 1392 | } |
| 1393 | |
| 1394 | /** |
| 1395 | * xs_connect - connect a socket to a remote endpoint |
| 1396 | * @task: address of RPC task that manages state of connect request |
| 1397 | * |
| 1398 | * TCP: If the remote end dropped the connection, delay reconnecting. |
| 1399 | * |
| 1400 | * UDP socket connects are synchronous, but we use a work queue anyway |
| 1401 | * to guarantee that even unprivileged user processes can set up a |
| 1402 | * socket on a privileged port. |
| 1403 | * |
| 1404 | * If a UDP socket connect fails, the delay behavior here prevents |
| 1405 | * retry floods (hard mounts). |
| 1406 | */ |
| 1407 | static void xs_connect(struct rpc_task *task) |
| 1408 | { |
| 1409 | struct rpc_xprt *xprt = task->tk_xprt; |
| 1410 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| 1411 | |
| 1412 | if (xprt_test_and_set_connecting(xprt)) |
| 1413 | return; |
| 1414 | |
| 1415 | if (transport->sock != NULL) { |
| 1416 | dprintk("RPC: xs_connect delayed xprt %p for %lu " |
| 1417 | "seconds\n", |
| 1418 | xprt, xprt->reestablish_timeout / HZ); |
| 1419 | queue_delayed_work(rpciod_workqueue, |
| 1420 | &transport->connect_worker, |
| 1421 | xprt->reestablish_timeout); |
| 1422 | xprt->reestablish_timeout <<= 1; |
| 1423 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) |
| 1424 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; |
| 1425 | } else { |
| 1426 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
| 1427 | queue_delayed_work(rpciod_workqueue, |
| 1428 | &transport->connect_worker, 0); |
| 1429 | } |
| 1430 | } |
| 1431 | |
| 1432 | /** |
| 1433 | * xs_udp_print_stats - display UDP socket-specifc stats |
| 1434 | * @xprt: rpc_xprt struct containing statistics |
| 1435 | * @seq: output file |
| 1436 | * |
| 1437 | */ |
| 1438 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) |
| 1439 | { |
| 1440 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| 1441 | |
| 1442 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", |
| 1443 | transport->port, |
| 1444 | xprt->stat.bind_count, |
| 1445 | xprt->stat.sends, |
| 1446 | xprt->stat.recvs, |
| 1447 | xprt->stat.bad_xids, |
| 1448 | xprt->stat.req_u, |
| 1449 | xprt->stat.bklog_u); |
| 1450 | } |
| 1451 | |
| 1452 | /** |
| 1453 | * xs_tcp_print_stats - display TCP socket-specifc stats |
| 1454 | * @xprt: rpc_xprt struct containing statistics |
| 1455 | * @seq: output file |
| 1456 | * |
| 1457 | */ |
| 1458 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) |
| 1459 | { |
| 1460 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
| 1461 | long idle_time = 0; |
| 1462 | |
| 1463 | if (xprt_connected(xprt)) |
| 1464 | idle_time = (long)(jiffies - xprt->last_used) / HZ; |
| 1465 | |
| 1466 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", |
| 1467 | transport->port, |
| 1468 | xprt->stat.bind_count, |
| 1469 | xprt->stat.connect_count, |
| 1470 | xprt->stat.connect_time, |
| 1471 | idle_time, |
| 1472 | xprt->stat.sends, |
| 1473 | xprt->stat.recvs, |
| 1474 | xprt->stat.bad_xids, |
| 1475 | xprt->stat.req_u, |
| 1476 | xprt->stat.bklog_u); |
| 1477 | } |
| 1478 | |
| 1479 | static struct rpc_xprt_ops xs_udp_ops = { |
| 1480 | .set_buffer_size = xs_udp_set_buffer_size, |
| 1481 | .reserve_xprt = xprt_reserve_xprt_cong, |
| 1482 | .release_xprt = xprt_release_xprt_cong, |
| 1483 | .rpcbind = rpcb_getport_async, |
| 1484 | .set_port = xs_set_port, |
| 1485 | .connect = xs_connect, |
| 1486 | .buf_alloc = rpc_malloc, |
| 1487 | .buf_free = rpc_free, |
| 1488 | .send_request = xs_udp_send_request, |
| 1489 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
| 1490 | .timer = xs_udp_timer, |
| 1491 | .release_request = xprt_release_rqst_cong, |
| 1492 | .close = xs_close, |
| 1493 | .destroy = xs_destroy, |
| 1494 | .print_stats = xs_udp_print_stats, |
| 1495 | }; |
| 1496 | |
| 1497 | static struct rpc_xprt_ops xs_tcp_ops = { |
| 1498 | .reserve_xprt = xprt_reserve_xprt, |
| 1499 | .release_xprt = xs_tcp_release_xprt, |
| 1500 | .rpcbind = rpcb_getport_async, |
| 1501 | .set_port = xs_set_port, |
| 1502 | .connect = xs_connect, |
| 1503 | .buf_alloc = rpc_malloc, |
| 1504 | .buf_free = rpc_free, |
| 1505 | .send_request = xs_tcp_send_request, |
| 1506 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
| 1507 | .close = xs_close, |
| 1508 | .destroy = xs_destroy, |
| 1509 | .print_stats = xs_tcp_print_stats, |
| 1510 | }; |
| 1511 | |
| 1512 | static struct rpc_xprt *xs_setup_xprt(struct rpc_xprtsock_create *args, unsigned int slot_table_size) |
| 1513 | { |
| 1514 | struct rpc_xprt *xprt; |
| 1515 | struct sock_xprt *new; |
| 1516 | |
| 1517 | if (args->addrlen > sizeof(xprt->addr)) { |
| 1518 | dprintk("RPC: xs_setup_xprt: address too large\n"); |
| 1519 | return ERR_PTR(-EBADF); |
| 1520 | } |
| 1521 | |
| 1522 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
| 1523 | if (new == NULL) { |
| 1524 | dprintk("RPC: xs_setup_xprt: couldn't allocate " |
| 1525 | "rpc_xprt\n"); |
| 1526 | return ERR_PTR(-ENOMEM); |
| 1527 | } |
| 1528 | xprt = &new->xprt; |
| 1529 | |
| 1530 | xprt->max_reqs = slot_table_size; |
| 1531 | xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL); |
| 1532 | if (xprt->slot == NULL) { |
| 1533 | kfree(xprt); |
| 1534 | dprintk("RPC: xs_setup_xprt: couldn't allocate slot " |
| 1535 | "table\n"); |
| 1536 | return ERR_PTR(-ENOMEM); |
| 1537 | } |
| 1538 | |
| 1539 | memcpy(&xprt->addr, args->dstaddr, args->addrlen); |
| 1540 | xprt->addrlen = args->addrlen; |
| 1541 | if (args->srcaddr) |
| 1542 | memcpy(&new->addr, args->srcaddr, args->addrlen); |
| 1543 | new->port = xs_get_random_port(); |
| 1544 | |
| 1545 | return xprt; |
| 1546 | } |
| 1547 | |
| 1548 | /** |
| 1549 | * xs_setup_udp - Set up transport to use a UDP socket |
| 1550 | * @args: rpc transport creation arguments |
| 1551 | * |
| 1552 | */ |
| 1553 | struct rpc_xprt *xs_setup_udp(struct rpc_xprtsock_create *args) |
| 1554 | { |
| 1555 | struct rpc_xprt *xprt; |
| 1556 | struct sock_xprt *transport; |
| 1557 | |
| 1558 | xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); |
| 1559 | if (IS_ERR(xprt)) |
| 1560 | return xprt; |
| 1561 | transport = container_of(xprt, struct sock_xprt, xprt); |
| 1562 | |
| 1563 | if (ntohs(((struct sockaddr_in *)args->dstaddr)->sin_port) != 0) |
| 1564 | xprt_set_bound(xprt); |
| 1565 | |
| 1566 | xprt->prot = IPPROTO_UDP; |
| 1567 | xprt->tsh_size = 0; |
| 1568 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
| 1569 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); |
| 1570 | |
| 1571 | INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_connect_worker); |
| 1572 | xprt->bind_timeout = XS_BIND_TO; |
| 1573 | xprt->connect_timeout = XS_UDP_CONN_TO; |
| 1574 | xprt->reestablish_timeout = XS_UDP_REEST_TO; |
| 1575 | xprt->idle_timeout = XS_IDLE_DISC_TO; |
| 1576 | |
| 1577 | xprt->ops = &xs_udp_ops; |
| 1578 | |
| 1579 | if (args->timeout) |
| 1580 | xprt->timeout = *args->timeout; |
| 1581 | else |
| 1582 | xprt_set_timeout(&xprt->timeout, 5, 5 * HZ); |
| 1583 | |
| 1584 | xs_format_peer_addresses(xprt); |
| 1585 | dprintk("RPC: set up transport to address %s\n", |
| 1586 | xprt->address_strings[RPC_DISPLAY_ALL]); |
| 1587 | |
| 1588 | return xprt; |
| 1589 | } |
| 1590 | |
| 1591 | /** |
| 1592 | * xs_setup_tcp - Set up transport to use a TCP socket |
| 1593 | * @args: rpc transport creation arguments |
| 1594 | * |
| 1595 | */ |
| 1596 | struct rpc_xprt *xs_setup_tcp(struct rpc_xprtsock_create *args) |
| 1597 | { |
| 1598 | struct rpc_xprt *xprt; |
| 1599 | struct sock_xprt *transport; |
| 1600 | |
| 1601 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); |
| 1602 | if (IS_ERR(xprt)) |
| 1603 | return xprt; |
| 1604 | transport = container_of(xprt, struct sock_xprt, xprt); |
| 1605 | |
| 1606 | if (ntohs(((struct sockaddr_in *)args->dstaddr)->sin_port) != 0) |
| 1607 | xprt_set_bound(xprt); |
| 1608 | |
| 1609 | xprt->prot = IPPROTO_TCP; |
| 1610 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
| 1611 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
| 1612 | |
| 1613 | INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker); |
| 1614 | xprt->bind_timeout = XS_BIND_TO; |
| 1615 | xprt->connect_timeout = XS_TCP_CONN_TO; |
| 1616 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
| 1617 | xprt->idle_timeout = XS_IDLE_DISC_TO; |
| 1618 | |
| 1619 | xprt->ops = &xs_tcp_ops; |
| 1620 | |
| 1621 | if (args->timeout) |
| 1622 | xprt->timeout = *args->timeout; |
| 1623 | else |
| 1624 | xprt_set_timeout(&xprt->timeout, 2, 60 * HZ); |
| 1625 | |
| 1626 | xs_format_peer_addresses(xprt); |
| 1627 | dprintk("RPC: set up transport to address %s\n", |
| 1628 | xprt->address_strings[RPC_DISPLAY_ALL]); |
| 1629 | |
| 1630 | return xprt; |
| 1631 | } |
| 1632 | |
| 1633 | /** |
| 1634 | * init_socket_xprt - set up xprtsock's sysctls |
| 1635 | * |
| 1636 | */ |
| 1637 | int init_socket_xprt(void) |
| 1638 | { |
| 1639 | #ifdef RPC_DEBUG |
| 1640 | if (!sunrpc_table_header) |
| 1641 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
| 1642 | #endif |
| 1643 | |
| 1644 | return 0; |
| 1645 | } |
| 1646 | |
| 1647 | /** |
| 1648 | * cleanup_socket_xprt - remove xprtsock's sysctls |
| 1649 | * |
| 1650 | */ |
| 1651 | void cleanup_socket_xprt(void) |
| 1652 | { |
| 1653 | #ifdef RPC_DEBUG |
| 1654 | if (sunrpc_table_header) { |
| 1655 | unregister_sysctl_table(sunrpc_table_header); |
| 1656 | sunrpc_table_header = NULL; |
| 1657 | } |
| 1658 | #endif |
| 1659 | } |