2 * linux/net/sunrpc/xprtsock.c
4 * Client-side transport implementation for sockets.
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>
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>
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
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>
26 #include <linux/net.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>
35 #include <net/checksum.h>
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
;
49 * How many times to try sending a request on a socket before waiting
50 * for the socket buffer to clear.
52 #define XS_SENDMSG_RETRY (10U)
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.
59 #define XS_UDP_CONN_TO (5U * HZ)
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.
66 #define XS_TCP_CONN_TO (60U * HZ)
69 * Wait duration for a reply from the RPC portmapper.
71 #define XS_BIND_TO (60U * HZ)
74 * Delay if a UDP socket connect error occurs. This is most likely some
75 * kind of resource problem on the local host.
77 #define XS_UDP_REEST_TO (2U * HZ)
80 * The reestablish timeout allows clients to delay for a bit before attempting
81 * to reconnect to a server that just dropped our connection.
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.
88 #define XS_TCP_INIT_REEST_TO (3U * HZ)
89 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
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.
96 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
99 # undef RPC_DEBUG_DATA
100 # define RPCDBG_FACILITY RPCDBG_TRANS
103 #ifdef RPC_DEBUG_DATA
104 static void xs_pktdump(char *msg
, u32
*packet
, unsigned int count
)
106 u8
*buf
= (u8
*) packet
;
109 dprintk("RPC: %s\n", msg
);
110 for (j
= 0; j
< count
&& j
< 128; j
+= 4) {
114 dprintk("0x%04x ", j
);
116 dprintk("%02x%02x%02x%02x ",
117 buf
[j
], buf
[j
+1], buf
[j
+2], buf
[j
+3]);
122 static inline void xs_pktdump(char *msg
, u32
*packet
, unsigned int count
)
129 struct rpc_xprt xprt
;
134 struct socket
* sock
;
138 * State of TCP reply receive
146 unsigned long tcp_copied
,
150 * Connection of transports
152 struct work_struct connect_worker
;
156 * UDP socket buffer size parameters
163 * TCP receive state flags
165 #define TCP_RCV_LAST_FRAG (1UL << 0)
166 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
167 #define TCP_RCV_COPY_XID (1UL << 2)
168 #define TCP_RCV_COPY_DATA (1UL << 3)
170 static void xs_format_peer_addresses(struct rpc_xprt
*xprt
)
172 struct sockaddr_in
*addr
= (struct sockaddr_in
*) &xprt
->addr
;
175 buf
= kzalloc(20, GFP_KERNEL
);
177 snprintf(buf
, 20, "%u.%u.%u.%u",
178 NIPQUAD(addr
->sin_addr
.s_addr
));
180 xprt
->address_strings
[RPC_DISPLAY_ADDR
] = buf
;
182 buf
= kzalloc(8, GFP_KERNEL
);
184 snprintf(buf
, 8, "%u",
185 ntohs(addr
->sin_port
));
187 xprt
->address_strings
[RPC_DISPLAY_PORT
] = buf
;
189 if (xprt
->prot
== IPPROTO_UDP
)
190 xprt
->address_strings
[RPC_DISPLAY_PROTO
] = "udp";
192 xprt
->address_strings
[RPC_DISPLAY_PROTO
] = "tcp";
194 buf
= kzalloc(48, GFP_KERNEL
);
196 snprintf(buf
, 48, "addr=%u.%u.%u.%u port=%u proto=%s",
197 NIPQUAD(addr
->sin_addr
.s_addr
),
198 ntohs(addr
->sin_port
),
199 xprt
->prot
== IPPROTO_UDP
? "udp" : "tcp");
201 xprt
->address_strings
[RPC_DISPLAY_ALL
] = buf
;
204 static void xs_free_peer_addresses(struct rpc_xprt
*xprt
)
206 kfree(xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
207 kfree(xprt
->address_strings
[RPC_DISPLAY_PORT
]);
208 kfree(xprt
->address_strings
[RPC_DISPLAY_ALL
]);
211 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
213 static int xs_send_kvec(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
, struct kvec
*vec
, unsigned int base
, int more
)
215 struct msghdr msg
= {
217 .msg_namelen
= addrlen
,
218 .msg_flags
= XS_SENDMSG_FLAGS
| (more
? MSG_MORE
: 0),
221 .iov_base
= vec
->iov_base
+ base
,
222 .iov_len
= vec
->iov_len
- base
,
225 if (iov
.iov_len
!= 0)
226 return kernel_sendmsg(sock
, &msg
, &iov
, 1, iov
.iov_len
);
227 return kernel_sendmsg(sock
, &msg
, NULL
, 0, 0);
230 static int xs_send_pagedata(struct socket
*sock
, struct xdr_buf
*xdr
, unsigned int base
, int more
)
233 unsigned int remainder
;
236 remainder
= xdr
->page_len
- base
;
237 base
+= xdr
->page_base
;
238 ppage
= xdr
->pages
+ (base
>> PAGE_SHIFT
);
241 unsigned int len
= min_t(unsigned int, PAGE_SIZE
- base
, remainder
);
242 int flags
= XS_SENDMSG_FLAGS
;
245 if (remainder
!= 0 || more
)
247 err
= sock
->ops
->sendpage(sock
, *ppage
, base
, len
, flags
);
248 if (remainder
== 0 || err
!= len
)
262 * xs_sendpages - write pages directly to a socket
263 * @sock: socket to send on
264 * @addr: UDP only -- address of destination
265 * @addrlen: UDP only -- length of destination address
266 * @xdr: buffer containing this request
267 * @base: starting position in the buffer
270 static int xs_sendpages(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
, struct xdr_buf
*xdr
, unsigned int base
)
272 unsigned int remainder
= xdr
->len
- base
;
278 clear_bit(SOCK_ASYNC_NOSPACE
, &sock
->flags
);
284 if (base
< xdr
->head
[0].iov_len
|| addr
!= NULL
) {
285 unsigned int len
= xdr
->head
[0].iov_len
- base
;
287 err
= xs_send_kvec(sock
, addr
, addrlen
, &xdr
->head
[0], base
, remainder
!= 0);
288 if (remainder
== 0 || err
!= len
)
293 base
-= xdr
->head
[0].iov_len
;
295 if (base
< xdr
->page_len
) {
296 unsigned int len
= xdr
->page_len
- base
;
298 err
= xs_send_pagedata(sock
, xdr
, base
, remainder
!= 0);
299 if (remainder
== 0 || err
!= len
)
304 base
-= xdr
->page_len
;
306 if (base
>= xdr
->tail
[0].iov_len
)
308 err
= xs_send_kvec(sock
, NULL
, 0, &xdr
->tail
[0], base
, 0);
318 * xs_nospace - place task on wait queue if transmit was incomplete
319 * @task: task to put to sleep
322 static void xs_nospace(struct rpc_task
*task
)
324 struct rpc_rqst
*req
= task
->tk_rqstp
;
325 struct rpc_xprt
*xprt
= req
->rq_xprt
;
326 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
328 dprintk("RPC: %4d xmit incomplete (%u left of %u)\n",
329 task
->tk_pid
, req
->rq_slen
- req
->rq_bytes_sent
,
332 if (test_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
)) {
333 /* Protect against races with write_space */
334 spin_lock_bh(&xprt
->transport_lock
);
336 /* Don't race with disconnect */
337 if (!xprt_connected(xprt
))
338 task
->tk_status
= -ENOTCONN
;
339 else if (test_bit(SOCK_NOSPACE
, &transport
->sock
->flags
))
340 xprt_wait_for_buffer_space(task
);
342 spin_unlock_bh(&xprt
->transport_lock
);
344 /* Keep holding the socket if it is blocked */
345 rpc_delay(task
, HZ
>>4);
349 * xs_udp_send_request - write an RPC request to a UDP socket
350 * @task: address of RPC task that manages the state of an RPC request
353 * 0: The request has been sent
354 * EAGAIN: The socket was blocked, please call again later to
355 * complete the request
356 * ENOTCONN: Caller needs to invoke connect logic then call again
357 * other: Some other error occured, the request was not sent
359 static int xs_udp_send_request(struct rpc_task
*task
)
361 struct rpc_rqst
*req
= task
->tk_rqstp
;
362 struct rpc_xprt
*xprt
= req
->rq_xprt
;
363 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
364 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
367 xs_pktdump("packet data:",
368 req
->rq_svec
->iov_base
,
369 req
->rq_svec
->iov_len
);
371 req
->rq_xtime
= jiffies
;
372 status
= xs_sendpages(transport
->sock
,
373 (struct sockaddr
*) &xprt
->addr
,
377 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
378 xdr
->len
- req
->rq_bytes_sent
, status
);
380 if (likely(status
>= (int) req
->rq_slen
))
383 /* Still some bytes left; set up for a retry later. */
391 /* When the server has died, an ICMP port unreachable message
392 * prompts ECONNREFUSED. */
398 dprintk("RPC: sendmsg returned unrecognized error %d\n",
406 static inline void xs_encode_tcp_record_marker(struct xdr_buf
*buf
)
408 u32 reclen
= buf
->len
- sizeof(rpc_fraghdr
);
409 rpc_fraghdr
*base
= buf
->head
[0].iov_base
;
410 *base
= htonl(RPC_LAST_STREAM_FRAGMENT
| reclen
);
414 * xs_tcp_send_request - write an RPC request to a TCP socket
415 * @task: address of RPC task that manages the state of an RPC request
418 * 0: The request has been sent
419 * EAGAIN: The socket was blocked, please call again later to
420 * complete the request
421 * ENOTCONN: Caller needs to invoke connect logic then call again
422 * other: Some other error occured, the request was not sent
424 * XXX: In the case of soft timeouts, should we eventually give up
425 * if sendmsg is not able to make progress?
427 static int xs_tcp_send_request(struct rpc_task
*task
)
429 struct rpc_rqst
*req
= task
->tk_rqstp
;
430 struct rpc_xprt
*xprt
= req
->rq_xprt
;
431 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
432 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
433 int status
, retry
= 0;
435 xs_encode_tcp_record_marker(&req
->rq_snd_buf
);
437 xs_pktdump("packet data:",
438 req
->rq_svec
->iov_base
,
439 req
->rq_svec
->iov_len
);
441 /* Continue transmitting the packet/record. We must be careful
442 * to cope with writespace callbacks arriving _after_ we have
443 * called sendmsg(). */
445 req
->rq_xtime
= jiffies
;
446 status
= xs_sendpages(transport
->sock
,
447 NULL
, 0, xdr
, req
->rq_bytes_sent
);
449 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
450 xdr
->len
- req
->rq_bytes_sent
, status
);
452 if (unlikely(status
< 0))
455 /* If we've sent the entire packet, immediately
456 * reset the count of bytes sent. */
457 req
->rq_bytes_sent
+= status
;
458 task
->tk_bytes_sent
+= status
;
459 if (likely(req
->rq_bytes_sent
>= req
->rq_slen
)) {
460 req
->rq_bytes_sent
= 0;
465 if (retry
++ > XS_SENDMSG_RETRY
)
480 dprintk("RPC: sendmsg returned unrecognized error %d\n",
482 xprt_disconnect(xprt
);
490 * xs_tcp_release_xprt - clean up after a tcp transmission
494 * This cleans up if an error causes us to abort the transmission of a request.
495 * In this case, the socket may need to be reset in order to avoid confusing
498 static void xs_tcp_release_xprt(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
500 struct rpc_rqst
*req
;
502 if (task
!= xprt
->snd_task
)
506 req
= task
->tk_rqstp
;
507 if (req
->rq_bytes_sent
== 0)
509 if (req
->rq_bytes_sent
== req
->rq_snd_buf
.len
)
511 set_bit(XPRT_CLOSE_WAIT
, &task
->tk_xprt
->state
);
513 xprt_release_xprt(xprt
, task
);
517 * xs_close - close a socket
520 * This is used when all requests are complete; ie, no DRC state remains
521 * on the server we want to save.
523 static void xs_close(struct rpc_xprt
*xprt
)
525 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
526 struct socket
*sock
= transport
->sock
;
527 struct sock
*sk
= transport
->inet
;
530 goto clear_close_wait
;
532 dprintk("RPC: xs_close xprt %p\n", xprt
);
534 write_lock_bh(&sk
->sk_callback_lock
);
535 transport
->inet
= NULL
;
536 transport
->sock
= NULL
;
538 sk
->sk_user_data
= NULL
;
539 sk
->sk_data_ready
= xprt
->old_data_ready
;
540 sk
->sk_state_change
= xprt
->old_state_change
;
541 sk
->sk_write_space
= xprt
->old_write_space
;
542 write_unlock_bh(&sk
->sk_callback_lock
);
548 smp_mb__before_clear_bit();
549 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
550 smp_mb__after_clear_bit();
554 * xs_destroy - prepare to shutdown a transport
555 * @xprt: doomed transport
558 static void xs_destroy(struct rpc_xprt
*xprt
)
560 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
562 dprintk("RPC: xs_destroy xprt %p\n", xprt
);
564 cancel_delayed_work(&transport
->connect_worker
);
565 flush_scheduled_work();
567 xprt_disconnect(xprt
);
569 xs_free_peer_addresses(xprt
);
574 static inline struct rpc_xprt
*xprt_from_sock(struct sock
*sk
)
576 return (struct rpc_xprt
*) sk
->sk_user_data
;
580 * xs_udp_data_ready - "data ready" callback for UDP sockets
581 * @sk: socket with data to read
582 * @len: how much data to read
585 static void xs_udp_data_ready(struct sock
*sk
, int len
)
587 struct rpc_task
*task
;
588 struct rpc_xprt
*xprt
;
589 struct rpc_rqst
*rovr
;
591 int err
, repsize
, copied
;
595 read_lock(&sk
->sk_callback_lock
);
596 dprintk("RPC: xs_udp_data_ready...\n");
597 if (!(xprt
= xprt_from_sock(sk
)))
600 if ((skb
= skb_recv_datagram(sk
, 0, 1, &err
)) == NULL
)
606 repsize
= skb
->len
- sizeof(struct udphdr
);
608 dprintk("RPC: impossible RPC reply size %d!\n", repsize
);
612 /* Copy the XID from the skb... */
613 xp
= skb_header_pointer(skb
, sizeof(struct udphdr
),
614 sizeof(_xid
), &_xid
);
618 /* Look up and lock the request corresponding to the given XID */
619 spin_lock(&xprt
->transport_lock
);
620 rovr
= xprt_lookup_rqst(xprt
, *xp
);
623 task
= rovr
->rq_task
;
625 if ((copied
= rovr
->rq_private_buf
.buflen
) > repsize
)
628 /* Suck it into the iovec, verify checksum if not done by hw. */
629 if (csum_partial_copy_to_xdr(&rovr
->rq_private_buf
, skb
))
632 /* Something worked... */
633 dst_confirm(skb
->dst
);
635 xprt_adjust_cwnd(task
, copied
);
636 xprt_update_rtt(task
);
637 xprt_complete_rqst(task
, copied
);
640 spin_unlock(&xprt
->transport_lock
);
642 skb_free_datagram(sk
, skb
);
644 read_unlock(&sk
->sk_callback_lock
);
647 static inline size_t xs_tcp_copy_data(skb_reader_t
*desc
, void *p
, size_t len
)
649 if (len
> desc
->count
)
651 if (skb_copy_bits(desc
->skb
, desc
->offset
, p
, len
)) {
652 dprintk("RPC: failed to copy %zu bytes from skb. %zu bytes remain\n",
658 dprintk("RPC: copied %zu bytes from skb. %zu bytes remain\n",
663 static inline void xs_tcp_read_fraghdr(struct rpc_xprt
*xprt
, skb_reader_t
*desc
)
665 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
669 p
= ((char *) &transport
->tcp_fraghdr
) + transport
->tcp_offset
;
670 len
= sizeof(transport
->tcp_fraghdr
) - transport
->tcp_offset
;
671 used
= xs_tcp_copy_data(desc
, p
, len
);
672 transport
->tcp_offset
+= used
;
676 transport
->tcp_reclen
= ntohl(transport
->tcp_fraghdr
);
677 if (transport
->tcp_reclen
& RPC_LAST_STREAM_FRAGMENT
)
678 transport
->tcp_flags
|= TCP_RCV_LAST_FRAG
;
680 transport
->tcp_flags
&= ~TCP_RCV_LAST_FRAG
;
681 transport
->tcp_reclen
&= RPC_FRAGMENT_SIZE_MASK
;
683 transport
->tcp_flags
&= ~TCP_RCV_COPY_FRAGHDR
;
684 transport
->tcp_offset
= 0;
686 /* Sanity check of the record length */
687 if (unlikely(transport
->tcp_reclen
< 4)) {
688 dprintk("RPC: invalid TCP record fragment length\n");
689 xprt_disconnect(xprt
);
692 dprintk("RPC: reading TCP record fragment of length %d\n",
693 transport
->tcp_reclen
);
696 static void xs_tcp_check_fraghdr(struct sock_xprt
*transport
)
698 if (transport
->tcp_offset
== transport
->tcp_reclen
) {
699 transport
->tcp_flags
|= TCP_RCV_COPY_FRAGHDR
;
700 transport
->tcp_offset
= 0;
701 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
) {
702 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
703 transport
->tcp_flags
|= TCP_RCV_COPY_XID
;
704 transport
->tcp_copied
= 0;
709 static inline void xs_tcp_read_xid(struct sock_xprt
*transport
, skb_reader_t
*desc
)
714 len
= sizeof(transport
->tcp_xid
) - transport
->tcp_offset
;
715 dprintk("RPC: reading XID (%Zu bytes)\n", len
);
716 p
= ((char *) &transport
->tcp_xid
) + transport
->tcp_offset
;
717 used
= xs_tcp_copy_data(desc
, p
, len
);
718 transport
->tcp_offset
+= used
;
721 transport
->tcp_flags
&= ~TCP_RCV_COPY_XID
;
722 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
723 transport
->tcp_copied
= 4;
724 dprintk("RPC: reading reply for XID %08x\n",
725 ntohl(transport
->tcp_xid
));
726 xs_tcp_check_fraghdr(transport
);
729 static inline void xs_tcp_read_request(struct rpc_xprt
*xprt
, skb_reader_t
*desc
)
731 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
732 struct rpc_rqst
*req
;
733 struct xdr_buf
*rcvbuf
;
737 /* Find and lock the request corresponding to this xid */
738 spin_lock(&xprt
->transport_lock
);
739 req
= xprt_lookup_rqst(xprt
, transport
->tcp_xid
);
741 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
742 dprintk("RPC: XID %08x request not found!\n",
743 ntohl(transport
->tcp_xid
));
744 spin_unlock(&xprt
->transport_lock
);
748 rcvbuf
= &req
->rq_private_buf
;
750 if (len
> transport
->tcp_reclen
- transport
->tcp_offset
) {
751 skb_reader_t my_desc
;
753 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
754 memcpy(&my_desc
, desc
, sizeof(my_desc
));
756 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
757 &my_desc
, xs_tcp_copy_data
);
761 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
762 desc
, xs_tcp_copy_data
);
765 transport
->tcp_copied
+= r
;
766 transport
->tcp_offset
+= r
;
769 /* Error when copying to the receive buffer,
770 * usually because we weren't able to allocate
771 * additional buffer pages. All we can do now
772 * is turn off TCP_RCV_COPY_DATA, so the request
773 * will not receive any additional updates,
775 * Any remaining data from this record will
778 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
779 dprintk("RPC: XID %08x truncated request\n",
780 ntohl(transport
->tcp_xid
));
781 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n",
782 xprt
, transport
->tcp_copied
, transport
->tcp_offset
,
783 transport
->tcp_reclen
);
787 dprintk("RPC: XID %08x read %Zd bytes\n",
788 ntohl(transport
->tcp_xid
), r
);
789 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n",
790 xprt
, transport
->tcp_copied
, transport
->tcp_offset
,
791 transport
->tcp_reclen
);
793 if (transport
->tcp_copied
== req
->rq_private_buf
.buflen
)
794 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
795 else if (transport
->tcp_offset
== transport
->tcp_reclen
) {
796 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
)
797 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
801 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
))
802 xprt_complete_rqst(req
->rq_task
, transport
->tcp_copied
);
803 spin_unlock(&xprt
->transport_lock
);
804 xs_tcp_check_fraghdr(transport
);
807 static inline void xs_tcp_read_discard(struct sock_xprt
*transport
, skb_reader_t
*desc
)
811 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
812 if (len
> desc
->count
)
816 transport
->tcp_offset
+= len
;
817 dprintk("RPC: discarded %Zu bytes\n", len
);
818 xs_tcp_check_fraghdr(transport
);
821 static int xs_tcp_data_recv(read_descriptor_t
*rd_desc
, struct sk_buff
*skb
, unsigned int offset
, size_t len
)
823 struct rpc_xprt
*xprt
= rd_desc
->arg
.data
;
824 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
825 skb_reader_t desc
= {
831 dprintk("RPC: xs_tcp_data_recv started\n");
833 /* Read in a new fragment marker if necessary */
834 /* Can we ever really expect to get completely empty fragments? */
835 if (transport
->tcp_flags
& TCP_RCV_COPY_FRAGHDR
) {
836 xs_tcp_read_fraghdr(xprt
, &desc
);
839 /* Read in the xid if necessary */
840 if (transport
->tcp_flags
& TCP_RCV_COPY_XID
) {
841 xs_tcp_read_xid(transport
, &desc
);
844 /* Read in the request data */
845 if (transport
->tcp_flags
& TCP_RCV_COPY_DATA
) {
846 xs_tcp_read_request(xprt
, &desc
);
849 /* Skip over any trailing bytes on short reads */
850 xs_tcp_read_discard(transport
, &desc
);
851 } while (desc
.count
);
852 dprintk("RPC: xs_tcp_data_recv done\n");
853 return len
- desc
.count
;
857 * xs_tcp_data_ready - "data ready" callback for TCP sockets
858 * @sk: socket with data to read
859 * @bytes: how much data to read
862 static void xs_tcp_data_ready(struct sock
*sk
, int bytes
)
864 struct rpc_xprt
*xprt
;
865 read_descriptor_t rd_desc
;
867 read_lock(&sk
->sk_callback_lock
);
868 dprintk("RPC: xs_tcp_data_ready...\n");
869 if (!(xprt
= xprt_from_sock(sk
)))
874 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
875 rd_desc
.arg
.data
= xprt
;
876 rd_desc
.count
= 65536;
877 tcp_read_sock(sk
, &rd_desc
, xs_tcp_data_recv
);
879 read_unlock(&sk
->sk_callback_lock
);
883 * xs_tcp_state_change - callback to handle TCP socket state changes
884 * @sk: socket whose state has changed
887 static void xs_tcp_state_change(struct sock
*sk
)
889 struct rpc_xprt
*xprt
;
891 read_lock(&sk
->sk_callback_lock
);
892 if (!(xprt
= xprt_from_sock(sk
)))
894 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt
);
895 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
896 sk
->sk_state
, xprt_connected(xprt
),
897 sock_flag(sk
, SOCK_DEAD
),
898 sock_flag(sk
, SOCK_ZAPPED
));
900 switch (sk
->sk_state
) {
901 case TCP_ESTABLISHED
:
902 spin_lock_bh(&xprt
->transport_lock
);
903 if (!xprt_test_and_set_connected(xprt
)) {
904 struct sock_xprt
*transport
= container_of(xprt
,
905 struct sock_xprt
, xprt
);
907 /* Reset TCP record info */
908 transport
->tcp_offset
= 0;
909 transport
->tcp_reclen
= 0;
910 transport
->tcp_copied
= 0;
911 transport
->tcp_flags
=
912 TCP_RCV_COPY_FRAGHDR
| TCP_RCV_COPY_XID
;
914 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
915 xprt_wake_pending_tasks(xprt
, 0);
917 spin_unlock_bh(&xprt
->transport_lock
);
923 /* Try to schedule an autoclose RPC calls */
924 set_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
925 if (test_and_set_bit(XPRT_LOCKED
, &xprt
->state
) == 0)
926 schedule_work(&xprt
->task_cleanup
);
928 xprt_disconnect(xprt
);
931 read_unlock(&sk
->sk_callback_lock
);
935 * xs_udp_write_space - callback invoked when socket buffer space
937 * @sk: socket whose state has changed
939 * Called when more output buffer space is available for this socket.
940 * We try not to wake our writers until they can make "significant"
941 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
942 * with a bunch of small requests.
944 static void xs_udp_write_space(struct sock
*sk
)
946 read_lock(&sk
->sk_callback_lock
);
948 /* from net/core/sock.c:sock_def_write_space */
949 if (sock_writeable(sk
)) {
951 struct rpc_xprt
*xprt
;
953 if (unlikely(!(sock
= sk
->sk_socket
)))
955 if (unlikely(!(xprt
= xprt_from_sock(sk
))))
957 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE
, &sock
->flags
)))
960 xprt_write_space(xprt
);
964 read_unlock(&sk
->sk_callback_lock
);
968 * xs_tcp_write_space - callback invoked when socket buffer space
970 * @sk: socket whose state has changed
972 * Called when more output buffer space is available for this socket.
973 * We try not to wake our writers until they can make "significant"
974 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
975 * with a bunch of small requests.
977 static void xs_tcp_write_space(struct sock
*sk
)
979 read_lock(&sk
->sk_callback_lock
);
981 /* from net/core/stream.c:sk_stream_write_space */
982 if (sk_stream_wspace(sk
) >= sk_stream_min_wspace(sk
)) {
984 struct rpc_xprt
*xprt
;
986 if (unlikely(!(sock
= sk
->sk_socket
)))
988 if (unlikely(!(xprt
= xprt_from_sock(sk
))))
990 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE
, &sock
->flags
)))
993 xprt_write_space(xprt
);
997 read_unlock(&sk
->sk_callback_lock
);
1000 static void xs_udp_do_set_buffer_size(struct rpc_xprt
*xprt
)
1002 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1003 struct sock
*sk
= transport
->inet
;
1005 if (transport
->rcvsize
) {
1006 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
1007 sk
->sk_rcvbuf
= transport
->rcvsize
* xprt
->max_reqs
* 2;
1009 if (transport
->sndsize
) {
1010 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
1011 sk
->sk_sndbuf
= transport
->sndsize
* xprt
->max_reqs
* 2;
1012 sk
->sk_write_space(sk
);
1017 * xs_udp_set_buffer_size - set send and receive limits
1018 * @xprt: generic transport
1019 * @sndsize: requested size of send buffer, in bytes
1020 * @rcvsize: requested size of receive buffer, in bytes
1022 * Set socket send and receive buffer size limits.
1024 static void xs_udp_set_buffer_size(struct rpc_xprt
*xprt
, size_t sndsize
, size_t rcvsize
)
1026 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1028 transport
->sndsize
= 0;
1030 transport
->sndsize
= sndsize
+ 1024;
1031 transport
->rcvsize
= 0;
1033 transport
->rcvsize
= rcvsize
+ 1024;
1035 xs_udp_do_set_buffer_size(xprt
);
1039 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1040 * @task: task that timed out
1042 * Adjust the congestion window after a retransmit timeout has occurred.
1044 static void xs_udp_timer(struct rpc_task
*task
)
1046 xprt_adjust_cwnd(task
, -ETIMEDOUT
);
1049 static unsigned short xs_get_random_port(void)
1051 unsigned short range
= xprt_max_resvport
- xprt_min_resvport
;
1052 unsigned short rand
= (unsigned short) net_random() % range
;
1053 return rand
+ xprt_min_resvport
;
1057 * xs_print_peer_address - format an IPv4 address for printing
1058 * @xprt: generic transport
1059 * @format: flags field indicating which parts of the address to render
1061 static char *xs_print_peer_address(struct rpc_xprt
*xprt
, enum rpc_display_format_t format
)
1063 if (xprt
->address_strings
[format
] != NULL
)
1064 return xprt
->address_strings
[format
];
1066 return "unprintable";
1070 * xs_set_port - reset the port number in the remote endpoint address
1071 * @xprt: generic transport
1072 * @port: new port number
1075 static void xs_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1077 struct sockaddr_in
*sap
= (struct sockaddr_in
*) &xprt
->addr
;
1079 dprintk("RPC: setting port for xprt %p to %u\n", xprt
, port
);
1081 sap
->sin_port
= htons(port
);
1084 static int xs_bindresvport(struct sock_xprt
*transport
, struct socket
*sock
)
1086 struct sockaddr_in myaddr
= {
1087 .sin_family
= AF_INET
,
1090 unsigned short port
= transport
->port
;
1093 myaddr
.sin_port
= htons(port
);
1094 err
= kernel_bind(sock
, (struct sockaddr
*) &myaddr
,
1097 transport
->port
= port
;
1098 dprintk("RPC: xs_bindresvport bound to port %u\n",
1102 if (port
<= xprt_min_resvport
)
1103 port
= xprt_max_resvport
;
1106 } while (err
== -EADDRINUSE
&& port
!= transport
->port
);
1108 dprintk("RPC: can't bind to reserved port (%d).\n", -err
);
1113 * xs_udp_connect_worker - set up a UDP socket
1114 * @args: RPC transport to connect
1116 * Invoked by a work queue tasklet.
1118 static void xs_udp_connect_worker(void *args
)
1120 struct sock_xprt
*transport
= (struct sock_xprt
*)args
;
1121 struct rpc_xprt
*xprt
= &transport
->xprt
;
1122 struct socket
*sock
= transport
->sock
;
1123 int err
, status
= -EIO
;
1125 if (xprt
->shutdown
|| !xprt_bound(xprt
))
1128 /* Start by resetting any existing state */
1131 if ((err
= sock_create_kern(PF_INET
, SOCK_DGRAM
, IPPROTO_UDP
, &sock
)) < 0) {
1132 dprintk("RPC: can't create UDP transport socket (%d).\n", -err
);
1136 if (xprt
->resvport
&& xs_bindresvport(transport
, sock
) < 0) {
1141 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1142 xprt
, xs_print_peer_address(xprt
, RPC_DISPLAY_ALL
));
1144 if (!transport
->inet
) {
1145 struct sock
*sk
= sock
->sk
;
1147 write_lock_bh(&sk
->sk_callback_lock
);
1149 sk
->sk_user_data
= xprt
;
1150 xprt
->old_data_ready
= sk
->sk_data_ready
;
1151 xprt
->old_state_change
= sk
->sk_state_change
;
1152 xprt
->old_write_space
= sk
->sk_write_space
;
1153 sk
->sk_data_ready
= xs_udp_data_ready
;
1154 sk
->sk_write_space
= xs_udp_write_space
;
1155 sk
->sk_no_check
= UDP_CSUM_NORCV
;
1156 sk
->sk_allocation
= GFP_ATOMIC
;
1158 xprt_set_connected(xprt
);
1160 /* Reset to new socket */
1161 transport
->sock
= sock
;
1162 transport
->inet
= sk
;
1164 write_unlock_bh(&sk
->sk_callback_lock
);
1166 xs_udp_do_set_buffer_size(xprt
);
1169 xprt_wake_pending_tasks(xprt
, status
);
1170 xprt_clear_connecting(xprt
);
1174 * We need to preserve the port number so the reply cache on the server can
1175 * find our cached RPC replies when we get around to reconnecting.
1177 static void xs_tcp_reuse_connection(struct rpc_xprt
*xprt
)
1180 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1181 struct sockaddr any
;
1183 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt
);
1186 * Disconnect the transport socket by doing a connect operation
1187 * with AF_UNSPEC. This should return immediately...
1189 memset(&any
, 0, sizeof(any
));
1190 any
.sa_family
= AF_UNSPEC
;
1191 result
= kernel_connect(transport
->sock
, &any
, sizeof(any
), 0);
1193 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1198 * xs_tcp_connect_worker - connect a TCP socket to a remote endpoint
1199 * @args: RPC transport to connect
1201 * Invoked by a work queue tasklet.
1203 static void xs_tcp_connect_worker(void *args
)
1205 struct sock_xprt
*transport
= (struct sock_xprt
*)args
;
1206 struct rpc_xprt
*xprt
= &transport
->xprt
;
1207 struct socket
*sock
= transport
->sock
;
1208 int err
, status
= -EIO
;
1210 if (xprt
->shutdown
|| !xprt_bound(xprt
))
1214 /* start from scratch */
1215 if ((err
= sock_create_kern(PF_INET
, SOCK_STREAM
, IPPROTO_TCP
, &sock
)) < 0) {
1216 dprintk("RPC: can't create TCP transport socket (%d).\n", -err
);
1220 if (xprt
->resvport
&& xs_bindresvport(transport
, sock
) < 0) {
1225 /* "close" the socket, preserving the local port */
1226 xs_tcp_reuse_connection(xprt
);
1228 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1229 xprt
, xs_print_peer_address(xprt
, RPC_DISPLAY_ALL
));
1231 if (!transport
->inet
) {
1232 struct sock
*sk
= sock
->sk
;
1234 write_lock_bh(&sk
->sk_callback_lock
);
1236 sk
->sk_user_data
= xprt
;
1237 xprt
->old_data_ready
= sk
->sk_data_ready
;
1238 xprt
->old_state_change
= sk
->sk_state_change
;
1239 xprt
->old_write_space
= sk
->sk_write_space
;
1240 sk
->sk_data_ready
= xs_tcp_data_ready
;
1241 sk
->sk_state_change
= xs_tcp_state_change
;
1242 sk
->sk_write_space
= xs_tcp_write_space
;
1243 sk
->sk_allocation
= GFP_ATOMIC
;
1245 /* socket options */
1246 sk
->sk_userlocks
|= SOCK_BINDPORT_LOCK
;
1247 sock_reset_flag(sk
, SOCK_LINGER
);
1248 tcp_sk(sk
)->linger2
= 0;
1249 tcp_sk(sk
)->nonagle
|= TCP_NAGLE_OFF
;
1251 xprt_clear_connected(xprt
);
1253 /* Reset to new socket */
1254 transport
->sock
= sock
;
1255 transport
->inet
= sk
;
1257 write_unlock_bh(&sk
->sk_callback_lock
);
1260 /* Tell the socket layer to start connecting... */
1261 xprt
->stat
.connect_count
++;
1262 xprt
->stat
.connect_start
= jiffies
;
1263 status
= kernel_connect(sock
, (struct sockaddr
*) &xprt
->addr
,
1264 xprt
->addrlen
, O_NONBLOCK
);
1265 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1266 xprt
, -status
, xprt_connected(xprt
), sock
->sk
->sk_state
);
1274 /* retry with existing socket, after a delay */
1277 /* get rid of existing socket, and retry */
1283 xprt_wake_pending_tasks(xprt
, status
);
1285 xprt_clear_connecting(xprt
);
1289 * xs_connect - connect a socket to a remote endpoint
1290 * @task: address of RPC task that manages state of connect request
1292 * TCP: If the remote end dropped the connection, delay reconnecting.
1294 * UDP socket connects are synchronous, but we use a work queue anyway
1295 * to guarantee that even unprivileged user processes can set up a
1296 * socket on a privileged port.
1298 * If a UDP socket connect fails, the delay behavior here prevents
1299 * retry floods (hard mounts).
1301 static void xs_connect(struct rpc_task
*task
)
1303 struct rpc_xprt
*xprt
= task
->tk_xprt
;
1304 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1306 if (xprt_test_and_set_connecting(xprt
))
1309 if (transport
->sock
!= NULL
) {
1310 dprintk("RPC: xs_connect delayed xprt %p for %lu seconds\n",
1311 xprt
, xprt
->reestablish_timeout
/ HZ
);
1312 schedule_delayed_work(&transport
->connect_worker
,
1313 xprt
->reestablish_timeout
);
1314 xprt
->reestablish_timeout
<<= 1;
1315 if (xprt
->reestablish_timeout
> XS_TCP_MAX_REEST_TO
)
1316 xprt
->reestablish_timeout
= XS_TCP_MAX_REEST_TO
;
1318 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt
);
1319 schedule_work(&transport
->connect_worker
);
1321 /* flush_scheduled_work can sleep... */
1322 if (!RPC_IS_ASYNC(task
))
1323 flush_scheduled_work();
1328 * xs_udp_print_stats - display UDP socket-specifc stats
1329 * @xprt: rpc_xprt struct containing statistics
1333 static void xs_udp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
1335 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1337 seq_printf(seq
, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1339 xprt
->stat
.bind_count
,
1342 xprt
->stat
.bad_xids
,
1344 xprt
->stat
.bklog_u
);
1348 * xs_tcp_print_stats - display TCP socket-specifc stats
1349 * @xprt: rpc_xprt struct containing statistics
1353 static void xs_tcp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
1355 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1358 if (xprt_connected(xprt
))
1359 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
1361 seq_printf(seq
, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1363 xprt
->stat
.bind_count
,
1364 xprt
->stat
.connect_count
,
1365 xprt
->stat
.connect_time
,
1369 xprt
->stat
.bad_xids
,
1371 xprt
->stat
.bklog_u
);
1374 static struct rpc_xprt_ops xs_udp_ops
= {
1375 .set_buffer_size
= xs_udp_set_buffer_size
,
1376 .print_addr
= xs_print_peer_address
,
1377 .reserve_xprt
= xprt_reserve_xprt_cong
,
1378 .release_xprt
= xprt_release_xprt_cong
,
1379 .rpcbind
= rpc_getport
,
1380 .set_port
= xs_set_port
,
1381 .connect
= xs_connect
,
1382 .buf_alloc
= rpc_malloc
,
1383 .buf_free
= rpc_free
,
1384 .send_request
= xs_udp_send_request
,
1385 .set_retrans_timeout
= xprt_set_retrans_timeout_rtt
,
1386 .timer
= xs_udp_timer
,
1387 .release_request
= xprt_release_rqst_cong
,
1389 .destroy
= xs_destroy
,
1390 .print_stats
= xs_udp_print_stats
,
1393 static struct rpc_xprt_ops xs_tcp_ops
= {
1394 .print_addr
= xs_print_peer_address
,
1395 .reserve_xprt
= xprt_reserve_xprt
,
1396 .release_xprt
= xs_tcp_release_xprt
,
1397 .rpcbind
= rpc_getport
,
1398 .set_port
= xs_set_port
,
1399 .connect
= xs_connect
,
1400 .buf_alloc
= rpc_malloc
,
1401 .buf_free
= rpc_free
,
1402 .send_request
= xs_tcp_send_request
,
1403 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
1405 .destroy
= xs_destroy
,
1406 .print_stats
= xs_tcp_print_stats
,
1409 static struct rpc_xprt
*xs_setup_xprt(struct sockaddr
*addr
, size_t addrlen
, unsigned int slot_table_size
)
1411 struct rpc_xprt
*xprt
;
1412 struct sock_xprt
*new;
1414 if (addrlen
> sizeof(xprt
->addr
)) {
1415 dprintk("RPC: xs_setup_xprt: address too large\n");
1416 return ERR_PTR(-EBADF
);
1419 new = kzalloc(sizeof(*new), GFP_KERNEL
);
1421 dprintk("RPC: xs_setup_xprt: couldn't allocate rpc_xprt\n");
1422 return ERR_PTR(-ENOMEM
);
1426 xprt
->max_reqs
= slot_table_size
;
1427 xprt
->slot
= kcalloc(xprt
->max_reqs
, sizeof(struct rpc_rqst
), GFP_KERNEL
);
1428 if (xprt
->slot
== NULL
) {
1430 dprintk("RPC: xs_setup_xprt: couldn't allocate slot table\n");
1431 return ERR_PTR(-ENOMEM
);
1434 memcpy(&xprt
->addr
, addr
, addrlen
);
1435 xprt
->addrlen
= addrlen
;
1436 new->port
= xs_get_random_port();
1442 * xs_setup_udp - Set up transport to use a UDP socket
1443 * @addr: address of remote server
1444 * @addrlen: length of address in bytes
1445 * @to: timeout parameters
1448 struct rpc_xprt
*xs_setup_udp(struct sockaddr
*addr
, size_t addrlen
, struct rpc_timeout
*to
)
1450 struct rpc_xprt
*xprt
;
1451 struct sock_xprt
*transport
;
1453 xprt
= xs_setup_xprt(addr
, addrlen
, xprt_udp_slot_table_entries
);
1456 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1458 if (ntohs(((struct sockaddr_in
*)addr
)->sin_port
) != 0)
1459 xprt_set_bound(xprt
);
1461 xprt
->prot
= IPPROTO_UDP
;
1463 /* XXX: header size can vary due to auth type, IPv6, etc. */
1464 xprt
->max_payload
= (1U << 16) - (MAX_HEADER
<< 3);
1466 INIT_WORK(&transport
->connect_worker
, xs_udp_connect_worker
, transport
);
1467 xprt
->bind_timeout
= XS_BIND_TO
;
1468 xprt
->connect_timeout
= XS_UDP_CONN_TO
;
1469 xprt
->reestablish_timeout
= XS_UDP_REEST_TO
;
1470 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
1472 xprt
->ops
= &xs_udp_ops
;
1475 xprt
->timeout
= *to
;
1477 xprt_set_timeout(&xprt
->timeout
, 5, 5 * HZ
);
1479 xs_format_peer_addresses(xprt
);
1480 dprintk("RPC: set up transport to address %s\n",
1481 xs_print_peer_address(xprt
, RPC_DISPLAY_ALL
));
1487 * xs_setup_tcp - Set up transport to use a TCP socket
1488 * @addr: address of remote server
1489 * @addrlen: length of address in bytes
1490 * @to: timeout parameters
1493 struct rpc_xprt
*xs_setup_tcp(struct sockaddr
*addr
, size_t addrlen
, struct rpc_timeout
*to
)
1495 struct rpc_xprt
*xprt
;
1496 struct sock_xprt
*transport
;
1498 xprt
= xs_setup_xprt(addr
, addrlen
, xprt_tcp_slot_table_entries
);
1501 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1503 if (ntohs(((struct sockaddr_in
*)addr
)->sin_port
) != 0)
1504 xprt_set_bound(xprt
);
1506 xprt
->prot
= IPPROTO_TCP
;
1507 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
1508 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
1510 INIT_WORK(&transport
->connect_worker
, xs_tcp_connect_worker
, transport
);
1511 xprt
->bind_timeout
= XS_BIND_TO
;
1512 xprt
->connect_timeout
= XS_TCP_CONN_TO
;
1513 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
1514 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
1516 xprt
->ops
= &xs_tcp_ops
;
1519 xprt
->timeout
= *to
;
1521 xprt_set_timeout(&xprt
->timeout
, 2, 60 * HZ
);
1523 xs_format_peer_addresses(xprt
);
1524 dprintk("RPC: set up transport to address %s\n",
1525 xs_print_peer_address(xprt
, RPC_DISPLAY_ALL
));