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/sched.h> 22 #include <linux/pagemap.h> 23 #include <linux/errno.h> 24 #include <linux/socket.h> 25 #include <linux/in.h> 26 #include <linux/net.h> 27 #include <linux/mm.h> 28 #include <linux/udp.h> 29 #include <linux/tcp.h> 30 #include <linux/sunrpc/clnt.h> 31 #include <linux/sunrpc/sched.h> 32 #include <linux/file.h> 33 34 #include <net/sock.h> 35 #include <net/checksum.h> 36 #include <net/udp.h> 37 #include <net/tcp.h> 38 39 /* 40 * xprtsock tunables 41 */ 42 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; 43 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE; 44 45 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; 46 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; 47 48 /* 49 * How many times to try sending a request on a socket before waiting 50 * for the socket buffer to clear. 51 */ 52 #define XS_SENDMSG_RETRY (10U) 53 54 /* 55 * Time out for an RPC UDP socket connect. UDP socket connects are 56 * synchronous, but we set a timeout anyway in case of resource 57 * exhaustion on the local host. 58 */ 59 #define XS_UDP_CONN_TO (5U * HZ) 60 61 /* 62 * Wait duration for an RPC TCP connection to be established. Solaris 63 * NFS over TCP uses 60 seconds, for example, which is in line with how 64 * long a server takes to reboot. 65 */ 66 #define XS_TCP_CONN_TO (60U * HZ) 67 68 /* 69 * Wait duration for a reply from the RPC portmapper. 70 */ 71 #define XS_BIND_TO (60U * HZ) 72 73 /* 74 * Delay if a UDP socket connect error occurs. This is most likely some 75 * kind of resource problem on the local host. 76 */ 77 #define XS_UDP_REEST_TO (2U * HZ) 78 79 /* 80 * The reestablish timeout allows clients to delay for a bit before attempting 81 * to reconnect to a server that just dropped our connection. 82 * 83 * We implement an exponential backoff when trying to reestablish a TCP 84 * transport connection with the server. Some servers like to drop a TCP 85 * connection when they are overworked, so we start with a short timeout and 86 * increase over time if the server is down or not responding. 87 */ 88 #define XS_TCP_INIT_REEST_TO (3U * HZ) 89 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) 90 91 /* 92 * TCP idle timeout; client drops the transport socket if it is idle 93 * for this long. Note that we also timeout UDP sockets to prevent 94 * holding port numbers when there is no RPC traffic. 95 */ 96 #define XS_IDLE_DISC_TO (5U * 60 * HZ) 97 98 #ifdef RPC_DEBUG 99 # undef RPC_DEBUG_DATA 100 # define RPCDBG_FACILITY RPCDBG_TRANS 101 #endif 102 103 #ifdef RPC_DEBUG_DATA 104 static void xs_pktdump(char *msg, u32 *packet, unsigned int count) 105 { 106 u8 *buf = (u8 *) packet; 107 int j; 108 109 dprintk("RPC: %s\n", msg); 110 for (j = 0; j < count && j < 128; j += 4) { 111 if (!(j & 31)) { 112 if (j) 113 dprintk("\n"); 114 dprintk("0x%04x ", j); 115 } 116 dprintk("%02x%02x%02x%02x ", 117 buf[j], buf[j+1], buf[j+2], buf[j+3]); 118 } 119 dprintk("\n"); 120 } 121 #else 122 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) 123 { 124 /* NOP */ 125 } 126 #endif 127 128 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) 129 130 static inline int xs_send_head(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, unsigned int len) 131 { 132 struct kvec iov = { 133 .iov_base = xdr->head[0].iov_base + base, 134 .iov_len = len - base, 135 }; 136 struct msghdr msg = { 137 .msg_name = addr, 138 .msg_namelen = addrlen, 139 .msg_flags = XS_SENDMSG_FLAGS, 140 }; 141 142 if (xdr->len > len) 143 msg.msg_flags |= MSG_MORE; 144 145 if (likely(iov.iov_len)) 146 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); 147 return kernel_sendmsg(sock, &msg, NULL, 0, 0); 148 } 149 150 static int xs_send_tail(struct socket *sock, struct xdr_buf *xdr, unsigned int base, unsigned int len) 151 { 152 struct kvec iov = { 153 .iov_base = xdr->tail[0].iov_base + base, 154 .iov_len = len - base, 155 }; 156 struct msghdr msg = { 157 .msg_flags = XS_SENDMSG_FLAGS, 158 }; 159 160 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); 161 } 162 163 /** 164 * xs_sendpages - write pages directly to a socket 165 * @sock: socket to send on 166 * @addr: UDP only -- address of destination 167 * @addrlen: UDP only -- length of destination address 168 * @xdr: buffer containing this request 169 * @base: starting position in the buffer 170 * 171 */ 172 static inline int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) 173 { 174 struct page **ppage = xdr->pages; 175 unsigned int len, pglen = xdr->page_len; 176 int err, ret = 0; 177 ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int); 178 179 if (unlikely(!sock)) 180 return -ENOTCONN; 181 182 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); 183 184 len = xdr->head[0].iov_len; 185 if (base < len || (addr != NULL && base == 0)) { 186 err = xs_send_head(sock, addr, addrlen, xdr, base, len); 187 if (ret == 0) 188 ret = err; 189 else if (err > 0) 190 ret += err; 191 if (err != (len - base)) 192 goto out; 193 base = 0; 194 } else 195 base -= len; 196 197 if (unlikely(pglen == 0)) 198 goto copy_tail; 199 if (unlikely(base >= pglen)) { 200 base -= pglen; 201 goto copy_tail; 202 } 203 if (base || xdr->page_base) { 204 pglen -= base; 205 base += xdr->page_base; 206 ppage += base >> PAGE_CACHE_SHIFT; 207 base &= ~PAGE_CACHE_MASK; 208 } 209 210 sendpage = sock->ops->sendpage ? : sock_no_sendpage; 211 do { 212 int flags = XS_SENDMSG_FLAGS; 213 214 len = PAGE_CACHE_SIZE; 215 if (base) 216 len -= base; 217 if (pglen < len) 218 len = pglen; 219 220 if (pglen != len || xdr->tail[0].iov_len != 0) 221 flags |= MSG_MORE; 222 223 /* Hmm... We might be dealing with highmem pages */ 224 if (PageHighMem(*ppage)) 225 sendpage = sock_no_sendpage; 226 err = sendpage(sock, *ppage, base, len, flags); 227 if (ret == 0) 228 ret = err; 229 else if (err > 0) 230 ret += err; 231 if (err != len) 232 goto out; 233 base = 0; 234 ppage++; 235 } while ((pglen -= len) != 0); 236 copy_tail: 237 len = xdr->tail[0].iov_len; 238 if (base < len) { 239 err = xs_send_tail(sock, xdr, base, len); 240 if (ret == 0) 241 ret = err; 242 else if (err > 0) 243 ret += err; 244 } 245 out: 246 return ret; 247 } 248 249 /** 250 * xs_nospace - place task on wait queue if transmit was incomplete 251 * @task: task to put to sleep 252 * 253 */ 254 static void xs_nospace(struct rpc_task *task) 255 { 256 struct rpc_rqst *req = task->tk_rqstp; 257 struct rpc_xprt *xprt = req->rq_xprt; 258 259 dprintk("RPC: %4d xmit incomplete (%u left of %u)\n", 260 task->tk_pid, req->rq_slen - req->rq_bytes_sent, 261 req->rq_slen); 262 263 if (test_bit(SOCK_ASYNC_NOSPACE, &xprt->sock->flags)) { 264 /* Protect against races with write_space */ 265 spin_lock_bh(&xprt->transport_lock); 266 267 /* Don't race with disconnect */ 268 if (!xprt_connected(xprt)) 269 task->tk_status = -ENOTCONN; 270 else if (test_bit(SOCK_NOSPACE, &xprt->sock->flags)) 271 xprt_wait_for_buffer_space(task); 272 273 spin_unlock_bh(&xprt->transport_lock); 274 } else 275 /* Keep holding the socket if it is blocked */ 276 rpc_delay(task, HZ>>4); 277 } 278 279 /** 280 * xs_udp_send_request - write an RPC request to a UDP socket 281 * @task: address of RPC task that manages the state of an RPC request 282 * 283 * Return values: 284 * 0: The request has been sent 285 * EAGAIN: The socket was blocked, please call again later to 286 * complete the request 287 * ENOTCONN: Caller needs to invoke connect logic then call again 288 * other: Some other error occured, the request was not sent 289 */ 290 static int xs_udp_send_request(struct rpc_task *task) 291 { 292 struct rpc_rqst *req = task->tk_rqstp; 293 struct rpc_xprt *xprt = req->rq_xprt; 294 struct xdr_buf *xdr = &req->rq_snd_buf; 295 int status; 296 297 xs_pktdump("packet data:", 298 req->rq_svec->iov_base, 299 req->rq_svec->iov_len); 300 301 req->rq_xtime = jiffies; 302 status = xs_sendpages(xprt->sock, (struct sockaddr *) &xprt->addr, 303 sizeof(xprt->addr), xdr, req->rq_bytes_sent); 304 305 dprintk("RPC: xs_udp_send_request(%u) = %d\n", 306 xdr->len - req->rq_bytes_sent, status); 307 308 if (likely(status >= (int) req->rq_slen)) 309 return 0; 310 311 /* Still some bytes left; set up for a retry later. */ 312 if (status > 0) 313 status = -EAGAIN; 314 315 switch (status) { 316 case -ENETUNREACH: 317 case -EPIPE: 318 case -ECONNREFUSED: 319 /* When the server has died, an ICMP port unreachable message 320 * prompts ECONNREFUSED. */ 321 break; 322 case -EAGAIN: 323 xs_nospace(task); 324 break; 325 default: 326 dprintk("RPC: sendmsg returned unrecognized error %d\n", 327 -status); 328 break; 329 } 330 331 return status; 332 } 333 334 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) 335 { 336 u32 reclen = buf->len - sizeof(rpc_fraghdr); 337 rpc_fraghdr *base = buf->head[0].iov_base; 338 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); 339 } 340 341 /** 342 * xs_tcp_send_request - write an RPC request to a TCP socket 343 * @task: address of RPC task that manages the state of an RPC request 344 * 345 * Return values: 346 * 0: The request has been sent 347 * EAGAIN: The socket was blocked, please call again later to 348 * complete the request 349 * ENOTCONN: Caller needs to invoke connect logic then call again 350 * other: Some other error occured, the request was not sent 351 * 352 * XXX: In the case of soft timeouts, should we eventually give up 353 * if sendmsg is not able to make progress? 354 */ 355 static int xs_tcp_send_request(struct rpc_task *task) 356 { 357 struct rpc_rqst *req = task->tk_rqstp; 358 struct rpc_xprt *xprt = req->rq_xprt; 359 struct xdr_buf *xdr = &req->rq_snd_buf; 360 int status, retry = 0; 361 362 xs_encode_tcp_record_marker(&req->rq_snd_buf); 363 364 xs_pktdump("packet data:", 365 req->rq_svec->iov_base, 366 req->rq_svec->iov_len); 367 368 /* Continue transmitting the packet/record. We must be careful 369 * to cope with writespace callbacks arriving _after_ we have 370 * called sendmsg(). */ 371 while (1) { 372 req->rq_xtime = jiffies; 373 status = xs_sendpages(xprt->sock, NULL, 0, xdr, 374 req->rq_bytes_sent); 375 376 dprintk("RPC: xs_tcp_send_request(%u) = %d\n", 377 xdr->len - req->rq_bytes_sent, status); 378 379 if (unlikely(status < 0)) 380 break; 381 382 /* If we've sent the entire packet, immediately 383 * reset the count of bytes sent. */ 384 req->rq_bytes_sent += status; 385 task->tk_bytes_sent += status; 386 if (likely(req->rq_bytes_sent >= req->rq_slen)) { 387 req->rq_bytes_sent = 0; 388 return 0; 389 } 390 391 status = -EAGAIN; 392 if (retry++ > XS_SENDMSG_RETRY) 393 break; 394 } 395 396 switch (status) { 397 case -EAGAIN: 398 xs_nospace(task); 399 break; 400 case -ECONNREFUSED: 401 case -ECONNRESET: 402 case -ENOTCONN: 403 case -EPIPE: 404 status = -ENOTCONN; 405 break; 406 default: 407 dprintk("RPC: sendmsg returned unrecognized error %d\n", 408 -status); 409 xprt_disconnect(xprt); 410 break; 411 } 412 413 return status; 414 } 415 416 /** 417 * xs_close - close a socket 418 * @xprt: transport 419 * 420 * This is used when all requests are complete; ie, no DRC state remains 421 * on the server we want to save. 422 */ 423 static void xs_close(struct rpc_xprt *xprt) 424 { 425 struct socket *sock = xprt->sock; 426 struct sock *sk = xprt->inet; 427 428 if (!sk) 429 goto clear_close_wait; 430 431 dprintk("RPC: xs_close xprt %p\n", xprt); 432 433 write_lock_bh(&sk->sk_callback_lock); 434 xprt->inet = NULL; 435 xprt->sock = NULL; 436 437 sk->sk_user_data = NULL; 438 sk->sk_data_ready = xprt->old_data_ready; 439 sk->sk_state_change = xprt->old_state_change; 440 sk->sk_write_space = xprt->old_write_space; 441 write_unlock_bh(&sk->sk_callback_lock); 442 443 sk->sk_no_check = 0; 444 445 sock_release(sock); 446 clear_close_wait: 447 smp_mb__before_clear_bit(); 448 clear_bit(XPRT_CLOSE_WAIT, &xprt->state); 449 smp_mb__after_clear_bit(); 450 } 451 452 /** 453 * xs_destroy - prepare to shutdown a transport 454 * @xprt: doomed transport 455 * 456 */ 457 static void xs_destroy(struct rpc_xprt *xprt) 458 { 459 dprintk("RPC: xs_destroy xprt %p\n", xprt); 460 461 cancel_delayed_work(&xprt->connect_worker); 462 flush_scheduled_work(); 463 464 xprt_disconnect(xprt); 465 xs_close(xprt); 466 kfree(xprt->slot); 467 } 468 469 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) 470 { 471 return (struct rpc_xprt *) sk->sk_user_data; 472 } 473 474 /** 475 * xs_udp_data_ready - "data ready" callback for UDP sockets 476 * @sk: socket with data to read 477 * @len: how much data to read 478 * 479 */ 480 static void xs_udp_data_ready(struct sock *sk, int len) 481 { 482 struct rpc_task *task; 483 struct rpc_xprt *xprt; 484 struct rpc_rqst *rovr; 485 struct sk_buff *skb; 486 int err, repsize, copied; 487 u32 _xid, *xp; 488 489 read_lock(&sk->sk_callback_lock); 490 dprintk("RPC: xs_udp_data_ready...\n"); 491 if (!(xprt = xprt_from_sock(sk))) 492 goto out; 493 494 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) 495 goto out; 496 497 if (xprt->shutdown) 498 goto dropit; 499 500 repsize = skb->len - sizeof(struct udphdr); 501 if (repsize < 4) { 502 dprintk("RPC: impossible RPC reply size %d!\n", repsize); 503 goto dropit; 504 } 505 506 /* Copy the XID from the skb... */ 507 xp = skb_header_pointer(skb, sizeof(struct udphdr), 508 sizeof(_xid), &_xid); 509 if (xp == NULL) 510 goto dropit; 511 512 /* Look up and lock the request corresponding to the given XID */ 513 spin_lock(&xprt->transport_lock); 514 rovr = xprt_lookup_rqst(xprt, *xp); 515 if (!rovr) 516 goto out_unlock; 517 task = rovr->rq_task; 518 519 if ((copied = rovr->rq_private_buf.buflen) > repsize) 520 copied = repsize; 521 522 /* Suck it into the iovec, verify checksum if not done by hw. */ 523 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) 524 goto out_unlock; 525 526 /* Something worked... */ 527 dst_confirm(skb->dst); 528 529 xprt_adjust_cwnd(task, copied); 530 xprt_update_rtt(task); 531 xprt_complete_rqst(task, copied); 532 533 out_unlock: 534 spin_unlock(&xprt->transport_lock); 535 dropit: 536 skb_free_datagram(sk, skb); 537 out: 538 read_unlock(&sk->sk_callback_lock); 539 } 540 541 static inline size_t xs_tcp_copy_data(skb_reader_t *desc, void *p, size_t len) 542 { 543 if (len > desc->count) 544 len = desc->count; 545 if (skb_copy_bits(desc->skb, desc->offset, p, len)) { 546 dprintk("RPC: failed to copy %zu bytes from skb. %zu bytes remain\n", 547 len, desc->count); 548 return 0; 549 } 550 desc->offset += len; 551 desc->count -= len; 552 dprintk("RPC: copied %zu bytes from skb. %zu bytes remain\n", 553 len, desc->count); 554 return len; 555 } 556 557 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, skb_reader_t *desc) 558 { 559 size_t len, used; 560 char *p; 561 562 p = ((char *) &xprt->tcp_recm) + xprt->tcp_offset; 563 len = sizeof(xprt->tcp_recm) - xprt->tcp_offset; 564 used = xs_tcp_copy_data(desc, p, len); 565 xprt->tcp_offset += used; 566 if (used != len) 567 return; 568 569 xprt->tcp_reclen = ntohl(xprt->tcp_recm); 570 if (xprt->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) 571 xprt->tcp_flags |= XPRT_LAST_FRAG; 572 else 573 xprt->tcp_flags &= ~XPRT_LAST_FRAG; 574 xprt->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; 575 576 xprt->tcp_flags &= ~XPRT_COPY_RECM; 577 xprt->tcp_offset = 0; 578 579 /* Sanity check of the record length */ 580 if (unlikely(xprt->tcp_reclen < 4)) { 581 dprintk("RPC: invalid TCP record fragment length\n"); 582 xprt_disconnect(xprt); 583 return; 584 } 585 dprintk("RPC: reading TCP record fragment of length %d\n", 586 xprt->tcp_reclen); 587 } 588 589 static void xs_tcp_check_recm(struct rpc_xprt *xprt) 590 { 591 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u, tcp_flags = %lx\n", 592 xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen, xprt->tcp_flags); 593 if (xprt->tcp_offset == xprt->tcp_reclen) { 594 xprt->tcp_flags |= XPRT_COPY_RECM; 595 xprt->tcp_offset = 0; 596 if (xprt->tcp_flags & XPRT_LAST_FRAG) { 597 xprt->tcp_flags &= ~XPRT_COPY_DATA; 598 xprt->tcp_flags |= XPRT_COPY_XID; 599 xprt->tcp_copied = 0; 600 } 601 } 602 } 603 604 static inline void xs_tcp_read_xid(struct rpc_xprt *xprt, skb_reader_t *desc) 605 { 606 size_t len, used; 607 char *p; 608 609 len = sizeof(xprt->tcp_xid) - xprt->tcp_offset; 610 dprintk("RPC: reading XID (%Zu bytes)\n", len); 611 p = ((char *) &xprt->tcp_xid) + xprt->tcp_offset; 612 used = xs_tcp_copy_data(desc, p, len); 613 xprt->tcp_offset += used; 614 if (used != len) 615 return; 616 xprt->tcp_flags &= ~XPRT_COPY_XID; 617 xprt->tcp_flags |= XPRT_COPY_DATA; 618 xprt->tcp_copied = 4; 619 dprintk("RPC: reading reply for XID %08x\n", 620 ntohl(xprt->tcp_xid)); 621 xs_tcp_check_recm(xprt); 622 } 623 624 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, skb_reader_t *desc) 625 { 626 struct rpc_rqst *req; 627 struct xdr_buf *rcvbuf; 628 size_t len; 629 ssize_t r; 630 631 /* Find and lock the request corresponding to this xid */ 632 spin_lock(&xprt->transport_lock); 633 req = xprt_lookup_rqst(xprt, xprt->tcp_xid); 634 if (!req) { 635 xprt->tcp_flags &= ~XPRT_COPY_DATA; 636 dprintk("RPC: XID %08x request not found!\n", 637 ntohl(xprt->tcp_xid)); 638 spin_unlock(&xprt->transport_lock); 639 return; 640 } 641 642 rcvbuf = &req->rq_private_buf; 643 len = desc->count; 644 if (len > xprt->tcp_reclen - xprt->tcp_offset) { 645 skb_reader_t my_desc; 646 647 len = xprt->tcp_reclen - xprt->tcp_offset; 648 memcpy(&my_desc, desc, sizeof(my_desc)); 649 my_desc.count = len; 650 r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied, 651 &my_desc, xs_tcp_copy_data); 652 desc->count -= r; 653 desc->offset += r; 654 } else 655 r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied, 656 desc, xs_tcp_copy_data); 657 658 if (r > 0) { 659 xprt->tcp_copied += r; 660 xprt->tcp_offset += r; 661 } 662 if (r != len) { 663 /* Error when copying to the receive buffer, 664 * usually because we weren't able to allocate 665 * additional buffer pages. All we can do now 666 * is turn off XPRT_COPY_DATA, so the request 667 * will not receive any additional updates, 668 * and time out. 669 * Any remaining data from this record will 670 * be discarded. 671 */ 672 xprt->tcp_flags &= ~XPRT_COPY_DATA; 673 dprintk("RPC: XID %08x truncated request\n", 674 ntohl(xprt->tcp_xid)); 675 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n", 676 xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen); 677 goto out; 678 } 679 680 dprintk("RPC: XID %08x read %Zd bytes\n", 681 ntohl(xprt->tcp_xid), r); 682 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n", 683 xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen); 684 685 if (xprt->tcp_copied == req->rq_private_buf.buflen) 686 xprt->tcp_flags &= ~XPRT_COPY_DATA; 687 else if (xprt->tcp_offset == xprt->tcp_reclen) { 688 if (xprt->tcp_flags & XPRT_LAST_FRAG) 689 xprt->tcp_flags &= ~XPRT_COPY_DATA; 690 } 691 692 out: 693 if (!(xprt->tcp_flags & XPRT_COPY_DATA)) 694 xprt_complete_rqst(req->rq_task, xprt->tcp_copied); 695 spin_unlock(&xprt->transport_lock); 696 xs_tcp_check_recm(xprt); 697 } 698 699 static inline void xs_tcp_read_discard(struct rpc_xprt *xprt, skb_reader_t *desc) 700 { 701 size_t len; 702 703 len = xprt->tcp_reclen - xprt->tcp_offset; 704 if (len > desc->count) 705 len = desc->count; 706 desc->count -= len; 707 desc->offset += len; 708 xprt->tcp_offset += len; 709 dprintk("RPC: discarded %Zu bytes\n", len); 710 xs_tcp_check_recm(xprt); 711 } 712 713 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) 714 { 715 struct rpc_xprt *xprt = rd_desc->arg.data; 716 skb_reader_t desc = { 717 .skb = skb, 718 .offset = offset, 719 .count = len, 720 .csum = 0 721 }; 722 723 dprintk("RPC: xs_tcp_data_recv started\n"); 724 do { 725 /* Read in a new fragment marker if necessary */ 726 /* Can we ever really expect to get completely empty fragments? */ 727 if (xprt->tcp_flags & XPRT_COPY_RECM) { 728 xs_tcp_read_fraghdr(xprt, &desc); 729 continue; 730 } 731 /* Read in the xid if necessary */ 732 if (xprt->tcp_flags & XPRT_COPY_XID) { 733 xs_tcp_read_xid(xprt, &desc); 734 continue; 735 } 736 /* Read in the request data */ 737 if (xprt->tcp_flags & XPRT_COPY_DATA) { 738 xs_tcp_read_request(xprt, &desc); 739 continue; 740 } 741 /* Skip over any trailing bytes on short reads */ 742 xs_tcp_read_discard(xprt, &desc); 743 } while (desc.count); 744 dprintk("RPC: xs_tcp_data_recv done\n"); 745 return len - desc.count; 746 } 747 748 /** 749 * xs_tcp_data_ready - "data ready" callback for TCP sockets 750 * @sk: socket with data to read 751 * @bytes: how much data to read 752 * 753 */ 754 static void xs_tcp_data_ready(struct sock *sk, int bytes) 755 { 756 struct rpc_xprt *xprt; 757 read_descriptor_t rd_desc; 758 759 read_lock(&sk->sk_callback_lock); 760 dprintk("RPC: xs_tcp_data_ready...\n"); 761 if (!(xprt = xprt_from_sock(sk))) 762 goto out; 763 if (xprt->shutdown) 764 goto out; 765 766 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ 767 rd_desc.arg.data = xprt; 768 rd_desc.count = 65536; 769 tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); 770 out: 771 read_unlock(&sk->sk_callback_lock); 772 } 773 774 /** 775 * xs_tcp_state_change - callback to handle TCP socket state changes 776 * @sk: socket whose state has changed 777 * 778 */ 779 static void xs_tcp_state_change(struct sock *sk) 780 { 781 struct rpc_xprt *xprt; 782 783 read_lock(&sk->sk_callback_lock); 784 if (!(xprt = xprt_from_sock(sk))) 785 goto out; 786 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); 787 dprintk("RPC: state %x conn %d dead %d zapped %d\n", 788 sk->sk_state, xprt_connected(xprt), 789 sock_flag(sk, SOCK_DEAD), 790 sock_flag(sk, SOCK_ZAPPED)); 791 792 switch (sk->sk_state) { 793 case TCP_ESTABLISHED: 794 spin_lock_bh(&xprt->transport_lock); 795 if (!xprt_test_and_set_connected(xprt)) { 796 /* Reset TCP record info */ 797 xprt->tcp_offset = 0; 798 xprt->tcp_reclen = 0; 799 xprt->tcp_copied = 0; 800 xprt->tcp_flags = XPRT_COPY_RECM | XPRT_COPY_XID; 801 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 802 xprt_wake_pending_tasks(xprt, 0); 803 } 804 spin_unlock_bh(&xprt->transport_lock); 805 break; 806 case TCP_SYN_SENT: 807 case TCP_SYN_RECV: 808 break; 809 case TCP_CLOSE_WAIT: 810 /* Try to schedule an autoclose RPC calls */ 811 set_bit(XPRT_CLOSE_WAIT, &xprt->state); 812 if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) 813 schedule_work(&xprt->task_cleanup); 814 default: 815 xprt_disconnect(xprt); 816 } 817 out: 818 read_unlock(&sk->sk_callback_lock); 819 } 820 821 /** 822 * xs_udp_write_space - callback invoked when socket buffer space 823 * becomes available 824 * @sk: socket whose state has changed 825 * 826 * Called when more output buffer space is available for this socket. 827 * We try not to wake our writers until they can make "significant" 828 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 829 * with a bunch of small requests. 830 */ 831 static void xs_udp_write_space(struct sock *sk) 832 { 833 read_lock(&sk->sk_callback_lock); 834 835 /* from net/core/sock.c:sock_def_write_space */ 836 if (sock_writeable(sk)) { 837 struct socket *sock; 838 struct rpc_xprt *xprt; 839 840 if (unlikely(!(sock = sk->sk_socket))) 841 goto out; 842 if (unlikely(!(xprt = xprt_from_sock(sk)))) 843 goto out; 844 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) 845 goto out; 846 847 xprt_write_space(xprt); 848 } 849 850 out: 851 read_unlock(&sk->sk_callback_lock); 852 } 853 854 /** 855 * xs_tcp_write_space - callback invoked when socket buffer space 856 * becomes available 857 * @sk: socket whose state has changed 858 * 859 * Called when more output buffer space is available for this socket. 860 * We try not to wake our writers until they can make "significant" 861 * progress, otherwise we'll waste resources thrashing kernel_sendmsg 862 * with a bunch of small requests. 863 */ 864 static void xs_tcp_write_space(struct sock *sk) 865 { 866 read_lock(&sk->sk_callback_lock); 867 868 /* from net/core/stream.c:sk_stream_write_space */ 869 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { 870 struct socket *sock; 871 struct rpc_xprt *xprt; 872 873 if (unlikely(!(sock = sk->sk_socket))) 874 goto out; 875 if (unlikely(!(xprt = xprt_from_sock(sk)))) 876 goto out; 877 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) 878 goto out; 879 880 xprt_write_space(xprt); 881 } 882 883 out: 884 read_unlock(&sk->sk_callback_lock); 885 } 886 887 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) 888 { 889 struct sock *sk = xprt->inet; 890 891 if (xprt->rcvsize) { 892 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 893 sk->sk_rcvbuf = xprt->rcvsize * xprt->max_reqs * 2; 894 } 895 if (xprt->sndsize) { 896 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 897 sk->sk_sndbuf = xprt->sndsize * xprt->max_reqs * 2; 898 sk->sk_write_space(sk); 899 } 900 } 901 902 /** 903 * xs_udp_set_buffer_size - set send and receive limits 904 * @xprt: generic transport 905 * @sndsize: requested size of send buffer, in bytes 906 * @rcvsize: requested size of receive buffer, in bytes 907 * 908 * Set socket send and receive buffer size limits. 909 */ 910 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) 911 { 912 xprt->sndsize = 0; 913 if (sndsize) 914 xprt->sndsize = sndsize + 1024; 915 xprt->rcvsize = 0; 916 if (rcvsize) 917 xprt->rcvsize = rcvsize + 1024; 918 919 xs_udp_do_set_buffer_size(xprt); 920 } 921 922 /** 923 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport 924 * @task: task that timed out 925 * 926 * Adjust the congestion window after a retransmit timeout has occurred. 927 */ 928 static void xs_udp_timer(struct rpc_task *task) 929 { 930 xprt_adjust_cwnd(task, -ETIMEDOUT); 931 } 932 933 static unsigned short xs_get_random_port(void) 934 { 935 unsigned short range = xprt_max_resvport - xprt_min_resvport; 936 unsigned short rand = (unsigned short) net_random() % range; 937 return rand + xprt_min_resvport; 938 } 939 940 /** 941 * xs_set_port - reset the port number in the remote endpoint address 942 * @xprt: generic transport 943 * @port: new port number 944 * 945 */ 946 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) 947 { 948 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); 949 xprt->addr.sin_port = htons(port); 950 } 951 952 static int xs_bindresvport(struct rpc_xprt *xprt, struct socket *sock) 953 { 954 struct sockaddr_in myaddr = { 955 .sin_family = AF_INET, 956 }; 957 int err; 958 unsigned short port = xprt->port; 959 960 do { 961 myaddr.sin_port = htons(port); 962 err = sock->ops->bind(sock, (struct sockaddr *) &myaddr, 963 sizeof(myaddr)); 964 if (err == 0) { 965 xprt->port = port; 966 dprintk("RPC: xs_bindresvport bound to port %u\n", 967 port); 968 return 0; 969 } 970 if (port <= xprt_min_resvport) 971 port = xprt_max_resvport; 972 else 973 port--; 974 } while (err == -EADDRINUSE && port != xprt->port); 975 976 dprintk("RPC: can't bind to reserved port (%d).\n", -err); 977 return err; 978 } 979 980 /** 981 * xs_udp_connect_worker - set up a UDP socket 982 * @args: RPC transport to connect 983 * 984 * Invoked by a work queue tasklet. 985 */ 986 static void xs_udp_connect_worker(void *args) 987 { 988 struct rpc_xprt *xprt = (struct rpc_xprt *) args; 989 struct socket *sock = xprt->sock; 990 int err, status = -EIO; 991 992 if (xprt->shutdown || xprt->addr.sin_port == 0) 993 goto out; 994 995 dprintk("RPC: xs_udp_connect_worker for xprt %p\n", xprt); 996 997 /* Start by resetting any existing state */ 998 xs_close(xprt); 999 1000 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { 1001 dprintk("RPC: can't create UDP transport socket (%d).\n", -err); 1002 goto out; 1003 } 1004 1005 if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) { 1006 sock_release(sock); 1007 goto out; 1008 } 1009 1010 if (!xprt->inet) { 1011 struct sock *sk = sock->sk; 1012 1013 write_lock_bh(&sk->sk_callback_lock); 1014 1015 sk->sk_user_data = xprt; 1016 xprt->old_data_ready = sk->sk_data_ready; 1017 xprt->old_state_change = sk->sk_state_change; 1018 xprt->old_write_space = sk->sk_write_space; 1019 sk->sk_data_ready = xs_udp_data_ready; 1020 sk->sk_write_space = xs_udp_write_space; 1021 sk->sk_no_check = UDP_CSUM_NORCV; 1022 sk->sk_allocation = GFP_ATOMIC; 1023 1024 xprt_set_connected(xprt); 1025 1026 /* Reset to new socket */ 1027 xprt->sock = sock; 1028 xprt->inet = sk; 1029 1030 write_unlock_bh(&sk->sk_callback_lock); 1031 } 1032 xs_udp_do_set_buffer_size(xprt); 1033 status = 0; 1034 out: 1035 xprt_wake_pending_tasks(xprt, status); 1036 xprt_clear_connecting(xprt); 1037 } 1038 1039 /* 1040 * We need to preserve the port number so the reply cache on the server can 1041 * find our cached RPC replies when we get around to reconnecting. 1042 */ 1043 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt) 1044 { 1045 int result; 1046 struct socket *sock = xprt->sock; 1047 struct sockaddr any; 1048 1049 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); 1050 1051 /* 1052 * Disconnect the transport socket by doing a connect operation 1053 * with AF_UNSPEC. This should return immediately... 1054 */ 1055 memset(&any, 0, sizeof(any)); 1056 any.sa_family = AF_UNSPEC; 1057 result = sock->ops->connect(sock, &any, sizeof(any), 0); 1058 if (result) 1059 dprintk("RPC: AF_UNSPEC connect return code %d\n", 1060 result); 1061 } 1062 1063 /** 1064 * xs_tcp_connect_worker - connect a TCP socket to a remote endpoint 1065 * @args: RPC transport to connect 1066 * 1067 * Invoked by a work queue tasklet. 1068 */ 1069 static void xs_tcp_connect_worker(void *args) 1070 { 1071 struct rpc_xprt *xprt = (struct rpc_xprt *)args; 1072 struct socket *sock = xprt->sock; 1073 int err, status = -EIO; 1074 1075 if (xprt->shutdown || xprt->addr.sin_port == 0) 1076 goto out; 1077 1078 dprintk("RPC: xs_tcp_connect_worker for xprt %p\n", xprt); 1079 1080 if (!xprt->sock) { 1081 /* start from scratch */ 1082 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { 1083 dprintk("RPC: can't create TCP transport socket (%d).\n", -err); 1084 goto out; 1085 } 1086 1087 if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) { 1088 sock_release(sock); 1089 goto out; 1090 } 1091 } else 1092 /* "close" the socket, preserving the local port */ 1093 xs_tcp_reuse_connection(xprt); 1094 1095 if (!xprt->inet) { 1096 struct sock *sk = sock->sk; 1097 1098 write_lock_bh(&sk->sk_callback_lock); 1099 1100 sk->sk_user_data = xprt; 1101 xprt->old_data_ready = sk->sk_data_ready; 1102 xprt->old_state_change = sk->sk_state_change; 1103 xprt->old_write_space = sk->sk_write_space; 1104 sk->sk_data_ready = xs_tcp_data_ready; 1105 sk->sk_state_change = xs_tcp_state_change; 1106 sk->sk_write_space = xs_tcp_write_space; 1107 sk->sk_allocation = GFP_ATOMIC; 1108 1109 /* socket options */ 1110 sk->sk_userlocks |= SOCK_BINDPORT_LOCK; 1111 sock_reset_flag(sk, SOCK_LINGER); 1112 tcp_sk(sk)->linger2 = 0; 1113 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 1114 1115 xprt_clear_connected(xprt); 1116 1117 /* Reset to new socket */ 1118 xprt->sock = sock; 1119 xprt->inet = sk; 1120 1121 write_unlock_bh(&sk->sk_callback_lock); 1122 } 1123 1124 /* Tell the socket layer to start connecting... */ 1125 xprt->stat.connect_count++; 1126 xprt->stat.connect_start = jiffies; 1127 status = sock->ops->connect(sock, (struct sockaddr *) &xprt->addr, 1128 sizeof(xprt->addr), O_NONBLOCK); 1129 dprintk("RPC: %p connect status %d connected %d sock state %d\n", 1130 xprt, -status, xprt_connected(xprt), sock->sk->sk_state); 1131 if (status < 0) { 1132 switch (status) { 1133 case -EINPROGRESS: 1134 case -EALREADY: 1135 goto out_clear; 1136 case -ECONNREFUSED: 1137 case -ECONNRESET: 1138 /* retry with existing socket, after a delay */ 1139 break; 1140 default: 1141 /* get rid of existing socket, and retry */ 1142 xs_close(xprt); 1143 break; 1144 } 1145 } 1146 out: 1147 xprt_wake_pending_tasks(xprt, status); 1148 out_clear: 1149 xprt_clear_connecting(xprt); 1150 } 1151 1152 /** 1153 * xs_connect - connect a socket to a remote endpoint 1154 * @task: address of RPC task that manages state of connect request 1155 * 1156 * TCP: If the remote end dropped the connection, delay reconnecting. 1157 * 1158 * UDP socket connects are synchronous, but we use a work queue anyway 1159 * to guarantee that even unprivileged user processes can set up a 1160 * socket on a privileged port. 1161 * 1162 * If a UDP socket connect fails, the delay behavior here prevents 1163 * retry floods (hard mounts). 1164 */ 1165 static void xs_connect(struct rpc_task *task) 1166 { 1167 struct rpc_xprt *xprt = task->tk_xprt; 1168 1169 if (xprt_test_and_set_connecting(xprt)) 1170 return; 1171 1172 if (xprt->sock != NULL) { 1173 dprintk("RPC: xs_connect delayed xprt %p for %lu seconds\n", 1174 xprt, xprt->reestablish_timeout / HZ); 1175 schedule_delayed_work(&xprt->connect_worker, 1176 xprt->reestablish_timeout); 1177 xprt->reestablish_timeout <<= 1; 1178 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) 1179 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; 1180 } else { 1181 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); 1182 schedule_work(&xprt->connect_worker); 1183 1184 /* flush_scheduled_work can sleep... */ 1185 if (!RPC_IS_ASYNC(task)) 1186 flush_scheduled_work(); 1187 } 1188 } 1189 1190 /** 1191 * xs_udp_print_stats - display UDP socket-specifc stats 1192 * @xprt: rpc_xprt struct containing statistics 1193 * @seq: output file 1194 * 1195 */ 1196 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 1197 { 1198 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", 1199 xprt->port, 1200 xprt->stat.bind_count, 1201 xprt->stat.sends, 1202 xprt->stat.recvs, 1203 xprt->stat.bad_xids, 1204 xprt->stat.req_u, 1205 xprt->stat.bklog_u); 1206 } 1207 1208 /** 1209 * xs_tcp_print_stats - display TCP socket-specifc stats 1210 * @xprt: rpc_xprt struct containing statistics 1211 * @seq: output file 1212 * 1213 */ 1214 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) 1215 { 1216 long idle_time = 0; 1217 1218 if (xprt_connected(xprt)) 1219 idle_time = (long)(jiffies - xprt->last_used) / HZ; 1220 1221 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", 1222 xprt->port, 1223 xprt->stat.bind_count, 1224 xprt->stat.connect_count, 1225 xprt->stat.connect_time, 1226 idle_time, 1227 xprt->stat.sends, 1228 xprt->stat.recvs, 1229 xprt->stat.bad_xids, 1230 xprt->stat.req_u, 1231 xprt->stat.bklog_u); 1232 } 1233 1234 static struct rpc_xprt_ops xs_udp_ops = { 1235 .set_buffer_size = xs_udp_set_buffer_size, 1236 .reserve_xprt = xprt_reserve_xprt_cong, 1237 .release_xprt = xprt_release_xprt_cong, 1238 .set_port = xs_set_port, 1239 .connect = xs_connect, 1240 .buf_alloc = rpc_malloc, 1241 .buf_free = rpc_free, 1242 .send_request = xs_udp_send_request, 1243 .set_retrans_timeout = xprt_set_retrans_timeout_rtt, 1244 .timer = xs_udp_timer, 1245 .release_request = xprt_release_rqst_cong, 1246 .close = xs_close, 1247 .destroy = xs_destroy, 1248 .print_stats = xs_udp_print_stats, 1249 }; 1250 1251 static struct rpc_xprt_ops xs_tcp_ops = { 1252 .reserve_xprt = xprt_reserve_xprt, 1253 .release_xprt = xprt_release_xprt, 1254 .set_port = xs_set_port, 1255 .connect = xs_connect, 1256 .buf_alloc = rpc_malloc, 1257 .buf_free = rpc_free, 1258 .send_request = xs_tcp_send_request, 1259 .set_retrans_timeout = xprt_set_retrans_timeout_def, 1260 .close = xs_close, 1261 .destroy = xs_destroy, 1262 .print_stats = xs_tcp_print_stats, 1263 }; 1264 1265 /** 1266 * xs_setup_udp - Set up transport to use a UDP socket 1267 * @xprt: transport to set up 1268 * @to: timeout parameters 1269 * 1270 */ 1271 int xs_setup_udp(struct rpc_xprt *xprt, struct rpc_timeout *to) 1272 { 1273 size_t slot_table_size; 1274 1275 dprintk("RPC: setting up udp-ipv4 transport...\n"); 1276 1277 xprt->max_reqs = xprt_udp_slot_table_entries; 1278 slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]); 1279 xprt->slot = kmalloc(slot_table_size, GFP_KERNEL); 1280 if (xprt->slot == NULL) 1281 return -ENOMEM; 1282 memset(xprt->slot, 0, slot_table_size); 1283 1284 xprt->prot = IPPROTO_UDP; 1285 xprt->port = xs_get_random_port(); 1286 xprt->tsh_size = 0; 1287 xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0; 1288 /* XXX: header size can vary due to auth type, IPv6, etc. */ 1289 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); 1290 1291 INIT_WORK(&xprt->connect_worker, xs_udp_connect_worker, xprt); 1292 xprt->bind_timeout = XS_BIND_TO; 1293 xprt->connect_timeout = XS_UDP_CONN_TO; 1294 xprt->reestablish_timeout = XS_UDP_REEST_TO; 1295 xprt->idle_timeout = XS_IDLE_DISC_TO; 1296 1297 xprt->ops = &xs_udp_ops; 1298 1299 if (to) 1300 xprt->timeout = *to; 1301 else 1302 xprt_set_timeout(&xprt->timeout, 5, 5 * HZ); 1303 1304 return 0; 1305 } 1306 1307 /** 1308 * xs_setup_tcp - Set up transport to use a TCP socket 1309 * @xprt: transport to set up 1310 * @to: timeout parameters 1311 * 1312 */ 1313 int xs_setup_tcp(struct rpc_xprt *xprt, struct rpc_timeout *to) 1314 { 1315 size_t slot_table_size; 1316 1317 dprintk("RPC: setting up tcp-ipv4 transport...\n"); 1318 1319 xprt->max_reqs = xprt_tcp_slot_table_entries; 1320 slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]); 1321 xprt->slot = kmalloc(slot_table_size, GFP_KERNEL); 1322 if (xprt->slot == NULL) 1323 return -ENOMEM; 1324 memset(xprt->slot, 0, slot_table_size); 1325 1326 xprt->prot = IPPROTO_TCP; 1327 xprt->port = xs_get_random_port(); 1328 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); 1329 xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0; 1330 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; 1331 1332 INIT_WORK(&xprt->connect_worker, xs_tcp_connect_worker, xprt); 1333 xprt->bind_timeout = XS_BIND_TO; 1334 xprt->connect_timeout = XS_TCP_CONN_TO; 1335 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; 1336 xprt->idle_timeout = XS_IDLE_DISC_TO; 1337 1338 xprt->ops = &xs_tcp_ops; 1339 1340 if (to) 1341 xprt->timeout = *to; 1342 else 1343 xprt_set_timeout(&xprt->timeout, 2, 60 * HZ); 1344 1345 return 0; 1346 } 1347