ia64/linux-2.6.18-xen.hg

view net/sunrpc/xprtsock.c @ 871:9cbcc9008446

xen/x86: don't initialize cpu_data[]'s apicid field on generic code

Afaict, this is not only redundant with the intialization done in
drivers/xen/core/smpboot.c, but actually results - at least for
secondary CPUs - in the Xen-specific value written to be later
overwritten with whatever the generic code determines (with no
guarantee that the two values are identical).

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu May 14 10:09:15 2009 +0100 (2009-05-14)
parents 831230e53067
children
line source
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 */
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>
34 #include <net/sock.h>
35 #include <net/checksum.h>
36 #include <net/udp.h>
37 #include <net/tcp.h>
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;
45 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
46 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
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)
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)
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)
68 /*
69 * Wait duration for a reply from the RPC portmapper.
70 */
71 #define XS_BIND_TO (60U * HZ)
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)
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)
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)
98 #ifdef RPC_DEBUG
99 # undef RPC_DEBUG_DATA
100 # define RPCDBG_FACILITY RPCDBG_TRANS
101 #endif
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;
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
128 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
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 };
142 if (xdr->len > len)
143 msg.msg_flags |= MSG_MORE;
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 }
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 };
160 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
161 }
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);
179 if (unlikely(!sock))
180 return -ENOTCONN;
182 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
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;
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 }
210 sendpage = sock->ops->sendpage ? : sock_no_sendpage;
211 do {
212 int flags = XS_SENDMSG_FLAGS;
214 len = PAGE_CACHE_SIZE;
215 if (base)
216 len -= base;
217 if (pglen < len)
218 len = pglen;
220 if (pglen != len || xdr->tail[0].iov_len != 0)
221 flags |= MSG_MORE;
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 }
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;
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);
263 if (test_bit(SOCK_ASYNC_NOSPACE, &xprt->sock->flags)) {
264 /* Protect against races with write_space */
265 spin_lock_bh(&xprt->transport_lock);
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);
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 }
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;
297 xs_pktdump("packet data:",
298 req->rq_svec->iov_base,
299 req->rq_svec->iov_len);
301 req->rq_xtime = jiffies;
302 status = xs_sendpages(xprt->sock, (struct sockaddr *) &xprt->addr,
303 sizeof(xprt->addr), xdr, req->rq_bytes_sent);
305 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
306 xdr->len - req->rq_bytes_sent, status);
308 if (likely(status >= (int) req->rq_slen))
309 return 0;
311 /* Still some bytes left; set up for a retry later. */
312 if (status > 0)
313 status = -EAGAIN;
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 }
331 return status;
332 }
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 }
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;
362 xs_encode_tcp_record_marker(&req->rq_snd_buf);
364 xs_pktdump("packet data:",
365 req->rq_svec->iov_base,
366 req->rq_svec->iov_len);
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);
376 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
377 xdr->len - req->rq_bytes_sent, status);
379 if (unlikely(status < 0))
380 break;
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 }
391 status = -EAGAIN;
392 if (retry++ > XS_SENDMSG_RETRY)
393 break;
394 }
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 }
413 return status;
414 }
416 /**
417 * xs_tcp_release_xprt - clean up after a tcp transmission
418 * @xprt: transport
419 * @task: rpc task
420 *
421 * This cleans up if an error causes us to abort the transmission of a request.
422 * In this case, the socket may need to be reset in order to avoid confusing
423 * the server.
424 */
425 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
426 {
427 struct rpc_rqst *req;
429 if (task != xprt->snd_task)
430 return;
431 if (task == NULL)
432 goto out_release;
433 req = task->tk_rqstp;
434 if (req->rq_bytes_sent == 0)
435 goto out_release;
436 if (req->rq_bytes_sent == req->rq_snd_buf.len)
437 goto out_release;
438 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
439 out_release:
440 xprt_release_xprt(xprt, task);
441 }
443 /**
444 * xs_close - close a socket
445 * @xprt: transport
446 *
447 * This is used when all requests are complete; ie, no DRC state remains
448 * on the server we want to save.
449 */
450 static void xs_close(struct rpc_xprt *xprt)
451 {
452 struct socket *sock = xprt->sock;
453 struct sock *sk = xprt->inet;
455 if (!sk)
456 goto clear_close_wait;
458 dprintk("RPC: xs_close xprt %p\n", xprt);
460 write_lock_bh(&sk->sk_callback_lock);
461 xprt->inet = NULL;
462 xprt->sock = NULL;
464 sk->sk_user_data = NULL;
465 sk->sk_data_ready = xprt->old_data_ready;
466 sk->sk_state_change = xprt->old_state_change;
467 sk->sk_write_space = xprt->old_write_space;
468 write_unlock_bh(&sk->sk_callback_lock);
470 sk->sk_no_check = 0;
472 sock_release(sock);
473 clear_close_wait:
474 smp_mb__before_clear_bit();
475 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
476 smp_mb__after_clear_bit();
477 }
479 /**
480 * xs_destroy - prepare to shutdown a transport
481 * @xprt: doomed transport
482 *
483 */
484 static void xs_destroy(struct rpc_xprt *xprt)
485 {
486 dprintk("RPC: xs_destroy xprt %p\n", xprt);
488 cancel_delayed_work(&xprt->connect_worker);
489 flush_scheduled_work();
491 xprt_disconnect(xprt);
492 xs_close(xprt);
493 kfree(xprt->slot);
494 }
496 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
497 {
498 return (struct rpc_xprt *) sk->sk_user_data;
499 }
501 /**
502 * xs_udp_data_ready - "data ready" callback for UDP sockets
503 * @sk: socket with data to read
504 * @len: how much data to read
505 *
506 */
507 static void xs_udp_data_ready(struct sock *sk, int len)
508 {
509 struct rpc_task *task;
510 struct rpc_xprt *xprt;
511 struct rpc_rqst *rovr;
512 struct sk_buff *skb;
513 int err, repsize, copied;
514 u32 _xid, *xp;
516 read_lock(&sk->sk_callback_lock);
517 dprintk("RPC: xs_udp_data_ready...\n");
518 if (!(xprt = xprt_from_sock(sk)))
519 goto out;
521 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
522 goto out;
524 if (xprt->shutdown)
525 goto dropit;
527 repsize = skb->len - sizeof(struct udphdr);
528 if (repsize < 4) {
529 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
530 goto dropit;
531 }
533 /* Copy the XID from the skb... */
534 xp = skb_header_pointer(skb, sizeof(struct udphdr),
535 sizeof(_xid), &_xid);
536 if (xp == NULL)
537 goto dropit;
539 /* Look up and lock the request corresponding to the given XID */
540 spin_lock(&xprt->transport_lock);
541 rovr = xprt_lookup_rqst(xprt, *xp);
542 if (!rovr)
543 goto out_unlock;
544 task = rovr->rq_task;
546 if ((copied = rovr->rq_private_buf.buflen) > repsize)
547 copied = repsize;
549 /* Suck it into the iovec, verify checksum if not done by hw. */
550 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb))
551 goto out_unlock;
553 /* Something worked... */
554 dst_confirm(skb->dst);
556 xprt_adjust_cwnd(task, copied);
557 xprt_update_rtt(task);
558 xprt_complete_rqst(task, copied);
560 out_unlock:
561 spin_unlock(&xprt->transport_lock);
562 dropit:
563 skb_free_datagram(sk, skb);
564 out:
565 read_unlock(&sk->sk_callback_lock);
566 }
568 static inline size_t xs_tcp_copy_data(skb_reader_t *desc, void *p, size_t len)
569 {
570 if (len > desc->count)
571 len = desc->count;
572 if (skb_copy_bits(desc->skb, desc->offset, p, len)) {
573 dprintk("RPC: failed to copy %zu bytes from skb. %zu bytes remain\n",
574 len, desc->count);
575 return 0;
576 }
577 desc->offset += len;
578 desc->count -= len;
579 dprintk("RPC: copied %zu bytes from skb. %zu bytes remain\n",
580 len, desc->count);
581 return len;
582 }
584 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, skb_reader_t *desc)
585 {
586 size_t len, used;
587 char *p;
589 p = ((char *) &xprt->tcp_recm) + xprt->tcp_offset;
590 len = sizeof(xprt->tcp_recm) - xprt->tcp_offset;
591 used = xs_tcp_copy_data(desc, p, len);
592 xprt->tcp_offset += used;
593 if (used != len)
594 return;
596 xprt->tcp_reclen = ntohl(xprt->tcp_recm);
597 if (xprt->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
598 xprt->tcp_flags |= XPRT_LAST_FRAG;
599 else
600 xprt->tcp_flags &= ~XPRT_LAST_FRAG;
601 xprt->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
603 xprt->tcp_flags &= ~XPRT_COPY_RECM;
604 xprt->tcp_offset = 0;
606 /* Sanity check of the record length */
607 if (unlikely(xprt->tcp_reclen < 4)) {
608 dprintk("RPC: invalid TCP record fragment length\n");
609 xprt_disconnect(xprt);
610 return;
611 }
612 dprintk("RPC: reading TCP record fragment of length %d\n",
613 xprt->tcp_reclen);
614 }
616 static void xs_tcp_check_recm(struct rpc_xprt *xprt)
617 {
618 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u, tcp_flags = %lx\n",
619 xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen, xprt->tcp_flags);
620 if (xprt->tcp_offset == xprt->tcp_reclen) {
621 xprt->tcp_flags |= XPRT_COPY_RECM;
622 xprt->tcp_offset = 0;
623 if (xprt->tcp_flags & XPRT_LAST_FRAG) {
624 xprt->tcp_flags &= ~XPRT_COPY_DATA;
625 xprt->tcp_flags |= XPRT_COPY_XID;
626 xprt->tcp_copied = 0;
627 }
628 }
629 }
631 static inline void xs_tcp_read_xid(struct rpc_xprt *xprt, skb_reader_t *desc)
632 {
633 size_t len, used;
634 char *p;
636 len = sizeof(xprt->tcp_xid) - xprt->tcp_offset;
637 dprintk("RPC: reading XID (%Zu bytes)\n", len);
638 p = ((char *) &xprt->tcp_xid) + xprt->tcp_offset;
639 used = xs_tcp_copy_data(desc, p, len);
640 xprt->tcp_offset += used;
641 if (used != len)
642 return;
643 xprt->tcp_flags &= ~XPRT_COPY_XID;
644 xprt->tcp_flags |= XPRT_COPY_DATA;
645 xprt->tcp_copied = 4;
646 dprintk("RPC: reading reply for XID %08x\n",
647 ntohl(xprt->tcp_xid));
648 xs_tcp_check_recm(xprt);
649 }
651 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, skb_reader_t *desc)
652 {
653 struct rpc_rqst *req;
654 struct xdr_buf *rcvbuf;
655 size_t len;
656 ssize_t r;
658 /* Find and lock the request corresponding to this xid */
659 spin_lock(&xprt->transport_lock);
660 req = xprt_lookup_rqst(xprt, xprt->tcp_xid);
661 if (!req) {
662 xprt->tcp_flags &= ~XPRT_COPY_DATA;
663 dprintk("RPC: XID %08x request not found!\n",
664 ntohl(xprt->tcp_xid));
665 spin_unlock(&xprt->transport_lock);
666 return;
667 }
669 rcvbuf = &req->rq_private_buf;
670 len = desc->count;
671 if (len > xprt->tcp_reclen - xprt->tcp_offset) {
672 skb_reader_t my_desc;
674 len = xprt->tcp_reclen - xprt->tcp_offset;
675 memcpy(&my_desc, desc, sizeof(my_desc));
676 my_desc.count = len;
677 r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied,
678 &my_desc, xs_tcp_copy_data);
679 desc->count -= r;
680 desc->offset += r;
681 } else
682 r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied,
683 desc, xs_tcp_copy_data);
685 if (r > 0) {
686 xprt->tcp_copied += r;
687 xprt->tcp_offset += r;
688 }
689 if (r != len) {
690 /* Error when copying to the receive buffer,
691 * usually because we weren't able to allocate
692 * additional buffer pages. All we can do now
693 * is turn off XPRT_COPY_DATA, so the request
694 * will not receive any additional updates,
695 * and time out.
696 * Any remaining data from this record will
697 * be discarded.
698 */
699 xprt->tcp_flags &= ~XPRT_COPY_DATA;
700 dprintk("RPC: XID %08x truncated request\n",
701 ntohl(xprt->tcp_xid));
702 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n",
703 xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen);
704 goto out;
705 }
707 dprintk("RPC: XID %08x read %Zd bytes\n",
708 ntohl(xprt->tcp_xid), r);
709 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n",
710 xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen);
712 if (xprt->tcp_copied == req->rq_private_buf.buflen)
713 xprt->tcp_flags &= ~XPRT_COPY_DATA;
714 else if (xprt->tcp_offset == xprt->tcp_reclen) {
715 if (xprt->tcp_flags & XPRT_LAST_FRAG)
716 xprt->tcp_flags &= ~XPRT_COPY_DATA;
717 }
719 out:
720 if (!(xprt->tcp_flags & XPRT_COPY_DATA))
721 xprt_complete_rqst(req->rq_task, xprt->tcp_copied);
722 spin_unlock(&xprt->transport_lock);
723 xs_tcp_check_recm(xprt);
724 }
726 static inline void xs_tcp_read_discard(struct rpc_xprt *xprt, skb_reader_t *desc)
727 {
728 size_t len;
730 len = xprt->tcp_reclen - xprt->tcp_offset;
731 if (len > desc->count)
732 len = desc->count;
733 desc->count -= len;
734 desc->offset += len;
735 xprt->tcp_offset += len;
736 dprintk("RPC: discarded %Zu bytes\n", len);
737 xs_tcp_check_recm(xprt);
738 }
740 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
741 {
742 struct rpc_xprt *xprt = rd_desc->arg.data;
743 skb_reader_t desc = {
744 .skb = skb,
745 .offset = offset,
746 .count = len,
747 .csum = 0
748 };
750 dprintk("RPC: xs_tcp_data_recv started\n");
751 do {
752 /* Read in a new fragment marker if necessary */
753 /* Can we ever really expect to get completely empty fragments? */
754 if (xprt->tcp_flags & XPRT_COPY_RECM) {
755 xs_tcp_read_fraghdr(xprt, &desc);
756 continue;
757 }
758 /* Read in the xid if necessary */
759 if (xprt->tcp_flags & XPRT_COPY_XID) {
760 xs_tcp_read_xid(xprt, &desc);
761 continue;
762 }
763 /* Read in the request data */
764 if (xprt->tcp_flags & XPRT_COPY_DATA) {
765 xs_tcp_read_request(xprt, &desc);
766 continue;
767 }
768 /* Skip over any trailing bytes on short reads */
769 xs_tcp_read_discard(xprt, &desc);
770 } while (desc.count);
771 dprintk("RPC: xs_tcp_data_recv done\n");
772 return len - desc.count;
773 }
775 /**
776 * xs_tcp_data_ready - "data ready" callback for TCP sockets
777 * @sk: socket with data to read
778 * @bytes: how much data to read
779 *
780 */
781 static void xs_tcp_data_ready(struct sock *sk, int bytes)
782 {
783 struct rpc_xprt *xprt;
784 read_descriptor_t rd_desc;
786 read_lock(&sk->sk_callback_lock);
787 dprintk("RPC: xs_tcp_data_ready...\n");
788 if (!(xprt = xprt_from_sock(sk)))
789 goto out;
790 if (xprt->shutdown)
791 goto out;
793 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
794 rd_desc.arg.data = xprt;
795 rd_desc.count = 65536;
796 tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
797 out:
798 read_unlock(&sk->sk_callback_lock);
799 }
801 /**
802 * xs_tcp_state_change - callback to handle TCP socket state changes
803 * @sk: socket whose state has changed
804 *
805 */
806 static void xs_tcp_state_change(struct sock *sk)
807 {
808 struct rpc_xprt *xprt;
810 read_lock(&sk->sk_callback_lock);
811 if (!(xprt = xprt_from_sock(sk)))
812 goto out;
813 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
814 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
815 sk->sk_state, xprt_connected(xprt),
816 sock_flag(sk, SOCK_DEAD),
817 sock_flag(sk, SOCK_ZAPPED));
819 switch (sk->sk_state) {
820 case TCP_ESTABLISHED:
821 spin_lock_bh(&xprt->transport_lock);
822 if (!xprt_test_and_set_connected(xprt)) {
823 /* Reset TCP record info */
824 xprt->tcp_offset = 0;
825 xprt->tcp_reclen = 0;
826 xprt->tcp_copied = 0;
827 xprt->tcp_flags = XPRT_COPY_RECM | XPRT_COPY_XID;
828 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
829 xprt_wake_pending_tasks(xprt, 0);
830 }
831 spin_unlock_bh(&xprt->transport_lock);
832 break;
833 case TCP_SYN_SENT:
834 case TCP_SYN_RECV:
835 break;
836 case TCP_CLOSE_WAIT:
837 /* Try to schedule an autoclose RPC calls */
838 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
839 if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0)
840 schedule_work(&xprt->task_cleanup);
841 default:
842 xprt_disconnect(xprt);
843 }
844 out:
845 read_unlock(&sk->sk_callback_lock);
846 }
848 /**
849 * xs_udp_write_space - callback invoked when socket buffer space
850 * becomes available
851 * @sk: socket whose state has changed
852 *
853 * Called when more output buffer space is available for this socket.
854 * We try not to wake our writers until they can make "significant"
855 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
856 * with a bunch of small requests.
857 */
858 static void xs_udp_write_space(struct sock *sk)
859 {
860 read_lock(&sk->sk_callback_lock);
862 /* from net/core/sock.c:sock_def_write_space */
863 if (sock_writeable(sk)) {
864 struct socket *sock;
865 struct rpc_xprt *xprt;
867 if (unlikely(!(sock = sk->sk_socket)))
868 goto out;
869 if (unlikely(!(xprt = xprt_from_sock(sk))))
870 goto out;
871 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
872 goto out;
874 xprt_write_space(xprt);
875 }
877 out:
878 read_unlock(&sk->sk_callback_lock);
879 }
881 /**
882 * xs_tcp_write_space - callback invoked when socket buffer space
883 * becomes available
884 * @sk: socket whose state has changed
885 *
886 * Called when more output buffer space is available for this socket.
887 * We try not to wake our writers until they can make "significant"
888 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
889 * with a bunch of small requests.
890 */
891 static void xs_tcp_write_space(struct sock *sk)
892 {
893 read_lock(&sk->sk_callback_lock);
895 /* from net/core/stream.c:sk_stream_write_space */
896 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
897 struct socket *sock;
898 struct rpc_xprt *xprt;
900 if (unlikely(!(sock = sk->sk_socket)))
901 goto out;
902 if (unlikely(!(xprt = xprt_from_sock(sk))))
903 goto out;
904 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
905 goto out;
907 xprt_write_space(xprt);
908 }
910 out:
911 read_unlock(&sk->sk_callback_lock);
912 }
914 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
915 {
916 struct sock *sk = xprt->inet;
918 if (xprt->rcvsize) {
919 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
920 sk->sk_rcvbuf = xprt->rcvsize * xprt->max_reqs * 2;
921 }
922 if (xprt->sndsize) {
923 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
924 sk->sk_sndbuf = xprt->sndsize * xprt->max_reqs * 2;
925 sk->sk_write_space(sk);
926 }
927 }
929 /**
930 * xs_udp_set_buffer_size - set send and receive limits
931 * @xprt: generic transport
932 * @sndsize: requested size of send buffer, in bytes
933 * @rcvsize: requested size of receive buffer, in bytes
934 *
935 * Set socket send and receive buffer size limits.
936 */
937 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
938 {
939 xprt->sndsize = 0;
940 if (sndsize)
941 xprt->sndsize = sndsize + 1024;
942 xprt->rcvsize = 0;
943 if (rcvsize)
944 xprt->rcvsize = rcvsize + 1024;
946 xs_udp_do_set_buffer_size(xprt);
947 }
949 /**
950 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
951 * @task: task that timed out
952 *
953 * Adjust the congestion window after a retransmit timeout has occurred.
954 */
955 static void xs_udp_timer(struct rpc_task *task)
956 {
957 xprt_adjust_cwnd(task, -ETIMEDOUT);
958 }
960 static unsigned short xs_get_random_port(void)
961 {
962 unsigned short range = xprt_max_resvport - xprt_min_resvport;
963 unsigned short rand = (unsigned short) net_random() % range;
964 return rand + xprt_min_resvport;
965 }
967 /**
968 * xs_set_port - reset the port number in the remote endpoint address
969 * @xprt: generic transport
970 * @port: new port number
971 *
972 */
973 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
974 {
975 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
976 xprt->addr.sin_port = htons(port);
977 }
979 static int xs_bindresvport(struct rpc_xprt *xprt, struct socket *sock)
980 {
981 struct sockaddr_in myaddr = {
982 .sin_family = AF_INET,
983 };
984 int err;
985 unsigned short port = xprt->port;
987 do {
988 myaddr.sin_port = htons(port);
989 err = sock->ops->bind(sock, (struct sockaddr *) &myaddr,
990 sizeof(myaddr));
991 if (err == 0) {
992 xprt->port = port;
993 dprintk("RPC: xs_bindresvport bound to port %u\n",
994 port);
995 return 0;
996 }
997 if (port <= xprt_min_resvport)
998 port = xprt_max_resvport;
999 else
1000 port--;
1001 } while (err == -EADDRINUSE && port != xprt->port);
1003 dprintk("RPC: can't bind to reserved port (%d).\n", -err);
1004 return err;
1007 /**
1008 * xs_udp_connect_worker - set up a UDP socket
1009 * @args: RPC transport to connect
1011 * Invoked by a work queue tasklet.
1012 */
1013 static void xs_udp_connect_worker(void *args)
1015 struct rpc_xprt *xprt = (struct rpc_xprt *) args;
1016 struct socket *sock = xprt->sock;
1017 int err, status = -EIO;
1019 if (xprt->shutdown || xprt->addr.sin_port == 0)
1020 goto out;
1022 dprintk("RPC: xs_udp_connect_worker for xprt %p\n", xprt);
1024 /* Start by resetting any existing state */
1025 xs_close(xprt);
1027 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1028 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1029 goto out;
1032 if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) {
1033 sock_release(sock);
1034 goto out;
1037 if (!xprt->inet) {
1038 struct sock *sk = sock->sk;
1040 write_lock_bh(&sk->sk_callback_lock);
1042 sk->sk_user_data = xprt;
1043 xprt->old_data_ready = sk->sk_data_ready;
1044 xprt->old_state_change = sk->sk_state_change;
1045 xprt->old_write_space = sk->sk_write_space;
1046 sk->sk_data_ready = xs_udp_data_ready;
1047 sk->sk_write_space = xs_udp_write_space;
1048 sk->sk_no_check = UDP_CSUM_NORCV;
1049 sk->sk_allocation = GFP_ATOMIC;
1051 xprt_set_connected(xprt);
1053 /* Reset to new socket */
1054 xprt->sock = sock;
1055 xprt->inet = sk;
1057 write_unlock_bh(&sk->sk_callback_lock);
1059 xs_udp_do_set_buffer_size(xprt);
1060 status = 0;
1061 out:
1062 xprt_wake_pending_tasks(xprt, status);
1063 xprt_clear_connecting(xprt);
1066 /*
1067 * We need to preserve the port number so the reply cache on the server can
1068 * find our cached RPC replies when we get around to reconnecting.
1069 */
1070 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1072 int result;
1073 struct socket *sock = xprt->sock;
1074 struct sockaddr any;
1076 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1078 /*
1079 * Disconnect the transport socket by doing a connect operation
1080 * with AF_UNSPEC. This should return immediately...
1081 */
1082 memset(&any, 0, sizeof(any));
1083 any.sa_family = AF_UNSPEC;
1084 result = sock->ops->connect(sock, &any, sizeof(any), 0);
1085 if (result)
1086 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1087 result);
1090 /**
1091 * xs_tcp_connect_worker - connect a TCP socket to a remote endpoint
1092 * @args: RPC transport to connect
1094 * Invoked by a work queue tasklet.
1095 */
1096 static void xs_tcp_connect_worker(void *args)
1098 struct rpc_xprt *xprt = (struct rpc_xprt *)args;
1099 struct socket *sock = xprt->sock;
1100 int err, status = -EIO;
1102 if (xprt->shutdown || xprt->addr.sin_port == 0)
1103 goto out;
1105 dprintk("RPC: xs_tcp_connect_worker for xprt %p\n", xprt);
1107 if (!xprt->sock) {
1108 /* start from scratch */
1109 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1110 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1111 goto out;
1114 if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) {
1115 sock_release(sock);
1116 goto out;
1118 } else
1119 /* "close" the socket, preserving the local port */
1120 xs_tcp_reuse_connection(xprt);
1122 if (!xprt->inet) {
1123 struct sock *sk = sock->sk;
1125 write_lock_bh(&sk->sk_callback_lock);
1127 sk->sk_user_data = xprt;
1128 xprt->old_data_ready = sk->sk_data_ready;
1129 xprt->old_state_change = sk->sk_state_change;
1130 xprt->old_write_space = sk->sk_write_space;
1131 sk->sk_data_ready = xs_tcp_data_ready;
1132 sk->sk_state_change = xs_tcp_state_change;
1133 sk->sk_write_space = xs_tcp_write_space;
1134 sk->sk_allocation = GFP_ATOMIC;
1136 /* socket options */
1137 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1138 sock_reset_flag(sk, SOCK_LINGER);
1139 tcp_sk(sk)->linger2 = 0;
1140 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1142 xprt_clear_connected(xprt);
1144 /* Reset to new socket */
1145 xprt->sock = sock;
1146 xprt->inet = sk;
1148 write_unlock_bh(&sk->sk_callback_lock);
1151 /* Tell the socket layer to start connecting... */
1152 xprt->stat.connect_count++;
1153 xprt->stat.connect_start = jiffies;
1154 status = sock->ops->connect(sock, (struct sockaddr *) &xprt->addr,
1155 sizeof(xprt->addr), O_NONBLOCK);
1156 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1157 xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1158 if (status < 0) {
1159 switch (status) {
1160 case -EINPROGRESS:
1161 case -EALREADY:
1162 goto out_clear;
1163 case -ECONNREFUSED:
1164 case -ECONNRESET:
1165 /* retry with existing socket, after a delay */
1166 break;
1167 default:
1168 /* get rid of existing socket, and retry */
1169 xs_close(xprt);
1170 break;
1173 out:
1174 xprt_wake_pending_tasks(xprt, status);
1175 out_clear:
1176 xprt_clear_connecting(xprt);
1179 /**
1180 * xs_connect - connect a socket to a remote endpoint
1181 * @task: address of RPC task that manages state of connect request
1183 * TCP: If the remote end dropped the connection, delay reconnecting.
1185 * UDP socket connects are synchronous, but we use a work queue anyway
1186 * to guarantee that even unprivileged user processes can set up a
1187 * socket on a privileged port.
1189 * If a UDP socket connect fails, the delay behavior here prevents
1190 * retry floods (hard mounts).
1191 */
1192 static void xs_connect(struct rpc_task *task)
1194 struct rpc_xprt *xprt = task->tk_xprt;
1196 if (xprt_test_and_set_connecting(xprt))
1197 return;
1199 if (xprt->sock != NULL) {
1200 dprintk("RPC: xs_connect delayed xprt %p for %lu seconds\n",
1201 xprt, xprt->reestablish_timeout / HZ);
1202 schedule_delayed_work(&xprt->connect_worker,
1203 xprt->reestablish_timeout);
1204 xprt->reestablish_timeout <<= 1;
1205 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1206 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1207 } else {
1208 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1209 schedule_work(&xprt->connect_worker);
1211 /* flush_scheduled_work can sleep... */
1212 if (!RPC_IS_ASYNC(task))
1213 flush_scheduled_work();
1217 /**
1218 * xs_udp_print_stats - display UDP socket-specifc stats
1219 * @xprt: rpc_xprt struct containing statistics
1220 * @seq: output file
1222 */
1223 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1225 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1226 xprt->port,
1227 xprt->stat.bind_count,
1228 xprt->stat.sends,
1229 xprt->stat.recvs,
1230 xprt->stat.bad_xids,
1231 xprt->stat.req_u,
1232 xprt->stat.bklog_u);
1235 /**
1236 * xs_tcp_print_stats - display TCP socket-specifc stats
1237 * @xprt: rpc_xprt struct containing statistics
1238 * @seq: output file
1240 */
1241 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1243 long idle_time = 0;
1245 if (xprt_connected(xprt))
1246 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1248 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1249 xprt->port,
1250 xprt->stat.bind_count,
1251 xprt->stat.connect_count,
1252 xprt->stat.connect_time,
1253 idle_time,
1254 xprt->stat.sends,
1255 xprt->stat.recvs,
1256 xprt->stat.bad_xids,
1257 xprt->stat.req_u,
1258 xprt->stat.bklog_u);
1261 static struct rpc_xprt_ops xs_udp_ops = {
1262 .set_buffer_size = xs_udp_set_buffer_size,
1263 .reserve_xprt = xprt_reserve_xprt_cong,
1264 .release_xprt = xprt_release_xprt_cong,
1265 .set_port = xs_set_port,
1266 .connect = xs_connect,
1267 .buf_alloc = rpc_malloc,
1268 .buf_free = rpc_free,
1269 .send_request = xs_udp_send_request,
1270 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1271 .timer = xs_udp_timer,
1272 .release_request = xprt_release_rqst_cong,
1273 .close = xs_close,
1274 .destroy = xs_destroy,
1275 .print_stats = xs_udp_print_stats,
1276 };
1278 static struct rpc_xprt_ops xs_tcp_ops = {
1279 .reserve_xprt = xprt_reserve_xprt,
1280 .release_xprt = xs_tcp_release_xprt,
1281 .set_port = xs_set_port,
1282 .connect = xs_connect,
1283 .buf_alloc = rpc_malloc,
1284 .buf_free = rpc_free,
1285 .send_request = xs_tcp_send_request,
1286 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1287 .close = xs_close,
1288 .destroy = xs_destroy,
1289 .print_stats = xs_tcp_print_stats,
1290 };
1292 /**
1293 * xs_setup_udp - Set up transport to use a UDP socket
1294 * @xprt: transport to set up
1295 * @to: timeout parameters
1297 */
1298 int xs_setup_udp(struct rpc_xprt *xprt, struct rpc_timeout *to)
1300 size_t slot_table_size;
1302 dprintk("RPC: setting up udp-ipv4 transport...\n");
1304 xprt->max_reqs = xprt_udp_slot_table_entries;
1305 slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]);
1306 xprt->slot = kzalloc(slot_table_size, GFP_KERNEL);
1307 if (xprt->slot == NULL)
1308 return -ENOMEM;
1310 xprt->prot = IPPROTO_UDP;
1311 xprt->port = xs_get_random_port();
1312 xprt->tsh_size = 0;
1313 xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;
1314 /* XXX: header size can vary due to auth type, IPv6, etc. */
1315 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1317 INIT_WORK(&xprt->connect_worker, xs_udp_connect_worker, xprt);
1318 xprt->bind_timeout = XS_BIND_TO;
1319 xprt->connect_timeout = XS_UDP_CONN_TO;
1320 xprt->reestablish_timeout = XS_UDP_REEST_TO;
1321 xprt->idle_timeout = XS_IDLE_DISC_TO;
1323 xprt->ops = &xs_udp_ops;
1325 if (to)
1326 xprt->timeout = *to;
1327 else
1328 xprt_set_timeout(&xprt->timeout, 5, 5 * HZ);
1330 return 0;
1333 /**
1334 * xs_setup_tcp - Set up transport to use a TCP socket
1335 * @xprt: transport to set up
1336 * @to: timeout parameters
1338 */
1339 int xs_setup_tcp(struct rpc_xprt *xprt, struct rpc_timeout *to)
1341 size_t slot_table_size;
1343 dprintk("RPC: setting up tcp-ipv4 transport...\n");
1345 xprt->max_reqs = xprt_tcp_slot_table_entries;
1346 slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]);
1347 xprt->slot = kzalloc(slot_table_size, GFP_KERNEL);
1348 if (xprt->slot == NULL)
1349 return -ENOMEM;
1351 xprt->prot = IPPROTO_TCP;
1352 xprt->port = xs_get_random_port();
1353 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
1354 xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;
1355 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
1357 INIT_WORK(&xprt->connect_worker, xs_tcp_connect_worker, xprt);
1358 xprt->bind_timeout = XS_BIND_TO;
1359 xprt->connect_timeout = XS_TCP_CONN_TO;
1360 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1361 xprt->idle_timeout = XS_IDLE_DISC_TO;
1363 xprt->ops = &xs_tcp_ops;
1365 if (to)
1366 xprt->timeout = *to;
1367 else
1368 xprt_set_timeout(&xprt->timeout, 2, 60 * HZ);
1370 return 0;