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
)
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
)
133 .iov_base
= xdr
->head
[0].iov_base
+ base
,
134 .iov_len
= len
- base
,
136 struct msghdr msg
= {
138 .msg_namelen
= addrlen
,
139 .msg_flags
= XS_SENDMSG_FLAGS
,
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);
150 static int xs_send_tail(struct socket
*sock
, struct xdr_buf
*xdr
, unsigned int base
, unsigned int len
)
153 .iov_base
= xdr
->tail
[0].iov_base
+ base
,
154 .iov_len
= len
- base
,
156 struct msghdr msg
= {
157 .msg_flags
= XS_SENDMSG_FLAGS
,
160 return kernel_sendmsg(sock
, &msg
, &iov
, 1, iov
.iov_len
);
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
172 static inline int xs_sendpages(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
, struct xdr_buf
*xdr
, unsigned int base
)
174 struct page
**ppage
= xdr
->pages
;
175 unsigned int len
, pglen
= xdr
->page_len
;
177 ssize_t (*sendpage
)(struct socket
*, struct page
*, int, size_t, int);
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
);
191 if (err
!= (len
- base
))
197 if (unlikely(pglen
== 0))
199 if (unlikely(base
>= pglen
)) {
203 if (base
|| xdr
->page_base
) {
205 base
+= xdr
->page_base
;
206 ppage
+= base
>> PAGE_CACHE_SHIFT
;
207 base
&= ~PAGE_CACHE_MASK
;
210 sendpage
= sock
->ops
->sendpage
? : sock_no_sendpage
;
212 int flags
= XS_SENDMSG_FLAGS
;
214 len
= PAGE_CACHE_SIZE
;
220 if (pglen
!= len
|| xdr
->tail
[0].iov_len
!= 0)
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
);
235 } while ((pglen
-= len
) != 0);
237 len
= xdr
->tail
[0].iov_len
;
239 err
= xs_send_tail(sock
, xdr
, base
, len
);
250 * xs_nospace - place task on wait queue if transmit was incomplete
251 * @task: task to put to sleep
254 static void xs_nospace(struct rpc_task
*task
)
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
,
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
);
275 /* Keep holding the socket if it is blocked */
276 rpc_delay(task
, HZ
>>4);
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
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
290 static int xs_udp_send_request(struct rpc_task
*task
)
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
;
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
))
311 /* Still some bytes left; set up for a retry later. */
319 /* When the server has died, an ICMP port unreachable message
320 * prompts ECONNREFUSED. */
326 dprintk("RPC: sendmsg returned unrecognized error %d\n",
334 static inline void xs_encode_tcp_record_marker(struct xdr_buf
*buf
)
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
);
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
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
352 * XXX: In the case of soft timeouts, should we eventually give up
353 * if sendmsg is not able to make progress?
355 static int xs_tcp_send_request(struct rpc_task
*task
)
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(). */
372 req
->rq_xtime
= jiffies
;
373 status
= xs_sendpages(xprt
->sock
, NULL
, 0, xdr
,
376 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
377 xdr
->len
- req
->rq_bytes_sent
, status
);
379 if (unlikely(status
< 0))
382 /* If we've sent the entire packet, immediately
383 * reset the count of bytes sent. */
384 req
->rq_bytes_sent
+= status
;
385 if (likely(req
->rq_bytes_sent
>= req
->rq_slen
)) {
386 req
->rq_bytes_sent
= 0;
391 if (retry
++ > XS_SENDMSG_RETRY
)
406 dprintk("RPC: sendmsg returned unrecognized error %d\n",
408 xprt_disconnect(xprt
);
416 * xs_close - close a socket
419 * This is used when all requests are complete; ie, no DRC state remains
420 * on the server we want to save.
422 static void xs_close(struct rpc_xprt
*xprt
)
424 struct socket
*sock
= xprt
->sock
;
425 struct sock
*sk
= xprt
->inet
;
428 goto clear_close_wait
;
430 dprintk("RPC: xs_close xprt %p\n", xprt
);
432 write_lock_bh(&sk
->sk_callback_lock
);
436 sk
->sk_user_data
= NULL
;
437 sk
->sk_data_ready
= xprt
->old_data_ready
;
438 sk
->sk_state_change
= xprt
->old_state_change
;
439 sk
->sk_write_space
= xprt
->old_write_space
;
440 write_unlock_bh(&sk
->sk_callback_lock
);
446 smp_mb__before_clear_bit();
447 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
448 smp_mb__after_clear_bit();
452 * xs_destroy - prepare to shutdown a transport
453 * @xprt: doomed transport
456 static void xs_destroy(struct rpc_xprt
*xprt
)
458 dprintk("RPC: xs_destroy xprt %p\n", xprt
);
460 cancel_delayed_work(&xprt
->connect_worker
);
461 flush_scheduled_work();
463 xprt_disconnect(xprt
);
468 static inline struct rpc_xprt
*xprt_from_sock(struct sock
*sk
)
470 return (struct rpc_xprt
*) sk
->sk_user_data
;
474 * xs_udp_data_ready - "data ready" callback for UDP sockets
475 * @sk: socket with data to read
476 * @len: how much data to read
479 static void xs_udp_data_ready(struct sock
*sk
, int len
)
481 struct rpc_task
*task
;
482 struct rpc_xprt
*xprt
;
483 struct rpc_rqst
*rovr
;
485 int err
, repsize
, copied
;
488 read_lock(&sk
->sk_callback_lock
);
489 dprintk("RPC: xs_udp_data_ready...\n");
490 if (!(xprt
= xprt_from_sock(sk
)))
493 if ((skb
= skb_recv_datagram(sk
, 0, 1, &err
)) == NULL
)
499 repsize
= skb
->len
- sizeof(struct udphdr
);
501 dprintk("RPC: impossible RPC reply size %d!\n", repsize
);
505 /* Copy the XID from the skb... */
506 xp
= skb_header_pointer(skb
, sizeof(struct udphdr
),
507 sizeof(_xid
), &_xid
);
511 /* Look up and lock the request corresponding to the given XID */
512 spin_lock(&xprt
->transport_lock
);
513 rovr
= xprt_lookup_rqst(xprt
, *xp
);
516 task
= rovr
->rq_task
;
518 if ((copied
= rovr
->rq_private_buf
.buflen
) > repsize
)
521 /* Suck it into the iovec, verify checksum if not done by hw. */
522 if (csum_partial_copy_to_xdr(&rovr
->rq_private_buf
, skb
))
525 /* Something worked... */
526 dst_confirm(skb
->dst
);
528 xprt_adjust_cwnd(task
, copied
);
529 xprt_update_rtt(task
);
530 xprt_complete_rqst(task
, copied
);
533 spin_unlock(&xprt
->transport_lock
);
535 skb_free_datagram(sk
, skb
);
537 read_unlock(&sk
->sk_callback_lock
);
540 static inline size_t xs_tcp_copy_data(skb_reader_t
*desc
, void *p
, size_t len
)
542 if (len
> desc
->count
)
544 if (skb_copy_bits(desc
->skb
, desc
->offset
, p
, len
)) {
545 dprintk("RPC: failed to copy %zu bytes from skb. %zu bytes remain\n",
551 dprintk("RPC: copied %zu bytes from skb. %zu bytes remain\n",
556 static inline void xs_tcp_read_fraghdr(struct rpc_xprt
*xprt
, skb_reader_t
*desc
)
561 p
= ((char *) &xprt
->tcp_recm
) + xprt
->tcp_offset
;
562 len
= sizeof(xprt
->tcp_recm
) - xprt
->tcp_offset
;
563 used
= xs_tcp_copy_data(desc
, p
, len
);
564 xprt
->tcp_offset
+= used
;
568 xprt
->tcp_reclen
= ntohl(xprt
->tcp_recm
);
569 if (xprt
->tcp_reclen
& RPC_LAST_STREAM_FRAGMENT
)
570 xprt
->tcp_flags
|= XPRT_LAST_FRAG
;
572 xprt
->tcp_flags
&= ~XPRT_LAST_FRAG
;
573 xprt
->tcp_reclen
&= RPC_FRAGMENT_SIZE_MASK
;
575 xprt
->tcp_flags
&= ~XPRT_COPY_RECM
;
576 xprt
->tcp_offset
= 0;
578 /* Sanity check of the record length */
579 if (unlikely(xprt
->tcp_reclen
< 4)) {
580 dprintk("RPC: invalid TCP record fragment length\n");
581 xprt_disconnect(xprt
);
584 dprintk("RPC: reading TCP record fragment of length %d\n",
588 static void xs_tcp_check_recm(struct rpc_xprt
*xprt
)
590 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u, tcp_flags = %lx\n",
591 xprt
, xprt
->tcp_copied
, xprt
->tcp_offset
, xprt
->tcp_reclen
, xprt
->tcp_flags
);
592 if (xprt
->tcp_offset
== xprt
->tcp_reclen
) {
593 xprt
->tcp_flags
|= XPRT_COPY_RECM
;
594 xprt
->tcp_offset
= 0;
595 if (xprt
->tcp_flags
& XPRT_LAST_FRAG
) {
596 xprt
->tcp_flags
&= ~XPRT_COPY_DATA
;
597 xprt
->tcp_flags
|= XPRT_COPY_XID
;
598 xprt
->tcp_copied
= 0;
603 static inline void xs_tcp_read_xid(struct rpc_xprt
*xprt
, skb_reader_t
*desc
)
608 len
= sizeof(xprt
->tcp_xid
) - xprt
->tcp_offset
;
609 dprintk("RPC: reading XID (%Zu bytes)\n", len
);
610 p
= ((char *) &xprt
->tcp_xid
) + xprt
->tcp_offset
;
611 used
= xs_tcp_copy_data(desc
, p
, len
);
612 xprt
->tcp_offset
+= used
;
615 xprt
->tcp_flags
&= ~XPRT_COPY_XID
;
616 xprt
->tcp_flags
|= XPRT_COPY_DATA
;
617 xprt
->tcp_copied
= 4;
618 dprintk("RPC: reading reply for XID %08x\n",
619 ntohl(xprt
->tcp_xid
));
620 xs_tcp_check_recm(xprt
);
623 static inline void xs_tcp_read_request(struct rpc_xprt
*xprt
, skb_reader_t
*desc
)
625 struct rpc_rqst
*req
;
626 struct xdr_buf
*rcvbuf
;
630 /* Find and lock the request corresponding to this xid */
631 spin_lock(&xprt
->transport_lock
);
632 req
= xprt_lookup_rqst(xprt
, xprt
->tcp_xid
);
634 xprt
->tcp_flags
&= ~XPRT_COPY_DATA
;
635 dprintk("RPC: XID %08x request not found!\n",
636 ntohl(xprt
->tcp_xid
));
637 spin_unlock(&xprt
->transport_lock
);
641 rcvbuf
= &req
->rq_private_buf
;
643 if (len
> xprt
->tcp_reclen
- xprt
->tcp_offset
) {
644 skb_reader_t my_desc
;
646 len
= xprt
->tcp_reclen
- xprt
->tcp_offset
;
647 memcpy(&my_desc
, desc
, sizeof(my_desc
));
649 r
= xdr_partial_copy_from_skb(rcvbuf
, xprt
->tcp_copied
,
650 &my_desc
, xs_tcp_copy_data
);
654 r
= xdr_partial_copy_from_skb(rcvbuf
, xprt
->tcp_copied
,
655 desc
, xs_tcp_copy_data
);
658 xprt
->tcp_copied
+= r
;
659 xprt
->tcp_offset
+= r
;
662 /* Error when copying to the receive buffer,
663 * usually because we weren't able to allocate
664 * additional buffer pages. All we can do now
665 * is turn off XPRT_COPY_DATA, so the request
666 * will not receive any additional updates,
668 * Any remaining data from this record will
671 xprt
->tcp_flags
&= ~XPRT_COPY_DATA
;
672 dprintk("RPC: XID %08x truncated request\n",
673 ntohl(xprt
->tcp_xid
));
674 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n",
675 xprt
, xprt
->tcp_copied
, xprt
->tcp_offset
, xprt
->tcp_reclen
);
679 dprintk("RPC: XID %08x read %Zd bytes\n",
680 ntohl(xprt
->tcp_xid
), r
);
681 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n",
682 xprt
, xprt
->tcp_copied
, xprt
->tcp_offset
, xprt
->tcp_reclen
);
684 if (xprt
->tcp_copied
== req
->rq_private_buf
.buflen
)
685 xprt
->tcp_flags
&= ~XPRT_COPY_DATA
;
686 else if (xprt
->tcp_offset
== xprt
->tcp_reclen
) {
687 if (xprt
->tcp_flags
& XPRT_LAST_FRAG
)
688 xprt
->tcp_flags
&= ~XPRT_COPY_DATA
;
692 if (!(xprt
->tcp_flags
& XPRT_COPY_DATA
))
693 xprt_complete_rqst(req
->rq_task
, xprt
->tcp_copied
);
694 spin_unlock(&xprt
->transport_lock
);
695 xs_tcp_check_recm(xprt
);
698 static inline void xs_tcp_read_discard(struct rpc_xprt
*xprt
, skb_reader_t
*desc
)
702 len
= xprt
->tcp_reclen
- xprt
->tcp_offset
;
703 if (len
> desc
->count
)
707 xprt
->tcp_offset
+= len
;
708 dprintk("RPC: discarded %Zu bytes\n", len
);
709 xs_tcp_check_recm(xprt
);
712 static int xs_tcp_data_recv(read_descriptor_t
*rd_desc
, struct sk_buff
*skb
, unsigned int offset
, size_t len
)
714 struct rpc_xprt
*xprt
= rd_desc
->arg
.data
;
715 skb_reader_t desc
= {
722 dprintk("RPC: xs_tcp_data_recv started\n");
724 /* Read in a new fragment marker if necessary */
725 /* Can we ever really expect to get completely empty fragments? */
726 if (xprt
->tcp_flags
& XPRT_COPY_RECM
) {
727 xs_tcp_read_fraghdr(xprt
, &desc
);
730 /* Read in the xid if necessary */
731 if (xprt
->tcp_flags
& XPRT_COPY_XID
) {
732 xs_tcp_read_xid(xprt
, &desc
);
735 /* Read in the request data */
736 if (xprt
->tcp_flags
& XPRT_COPY_DATA
) {
737 xs_tcp_read_request(xprt
, &desc
);
740 /* Skip over any trailing bytes on short reads */
741 xs_tcp_read_discard(xprt
, &desc
);
742 } while (desc
.count
);
743 dprintk("RPC: xs_tcp_data_recv done\n");
744 return len
- desc
.count
;
748 * xs_tcp_data_ready - "data ready" callback for TCP sockets
749 * @sk: socket with data to read
750 * @bytes: how much data to read
753 static void xs_tcp_data_ready(struct sock
*sk
, int bytes
)
755 struct rpc_xprt
*xprt
;
756 read_descriptor_t rd_desc
;
758 read_lock(&sk
->sk_callback_lock
);
759 dprintk("RPC: xs_tcp_data_ready...\n");
760 if (!(xprt
= xprt_from_sock(sk
)))
765 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
766 rd_desc
.arg
.data
= xprt
;
767 rd_desc
.count
= 65536;
768 tcp_read_sock(sk
, &rd_desc
, xs_tcp_data_recv
);
770 read_unlock(&sk
->sk_callback_lock
);
774 * xs_tcp_state_change - callback to handle TCP socket state changes
775 * @sk: socket whose state has changed
778 static void xs_tcp_state_change(struct sock
*sk
)
780 struct rpc_xprt
*xprt
;
782 read_lock(&sk
->sk_callback_lock
);
783 if (!(xprt
= xprt_from_sock(sk
)))
785 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt
);
786 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
787 sk
->sk_state
, xprt_connected(xprt
),
788 sock_flag(sk
, SOCK_DEAD
),
789 sock_flag(sk
, SOCK_ZAPPED
));
791 switch (sk
->sk_state
) {
792 case TCP_ESTABLISHED
:
793 spin_lock_bh(&xprt
->transport_lock
);
794 if (!xprt_test_and_set_connected(xprt
)) {
795 /* Reset TCP record info */
796 xprt
->tcp_offset
= 0;
797 xprt
->tcp_reclen
= 0;
798 xprt
->tcp_copied
= 0;
799 xprt
->tcp_flags
= XPRT_COPY_RECM
| XPRT_COPY_XID
;
800 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
801 xprt_wake_pending_tasks(xprt
, 0);
803 spin_unlock_bh(&xprt
->transport_lock
);
809 /* Try to schedule an autoclose RPC calls */
810 set_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
811 if (test_and_set_bit(XPRT_LOCKED
, &xprt
->state
) == 0)
812 schedule_work(&xprt
->task_cleanup
);
814 xprt_disconnect(xprt
);
817 read_unlock(&sk
->sk_callback_lock
);
821 * xs_udp_write_space - callback invoked when socket buffer space
823 * @sk: socket whose state has changed
825 * Called when more output buffer space is available for this socket.
826 * We try not to wake our writers until they can make "significant"
827 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
828 * with a bunch of small requests.
830 static void xs_udp_write_space(struct sock
*sk
)
832 read_lock(&sk
->sk_callback_lock
);
834 /* from net/core/sock.c:sock_def_write_space */
835 if (sock_writeable(sk
)) {
837 struct rpc_xprt
*xprt
;
839 if (unlikely(!(sock
= sk
->sk_socket
)))
841 if (unlikely(!(xprt
= xprt_from_sock(sk
))))
843 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE
, &sock
->flags
)))
846 xprt_write_space(xprt
);
850 read_unlock(&sk
->sk_callback_lock
);
854 * xs_tcp_write_space - callback invoked when socket buffer space
856 * @sk: socket whose state has changed
858 * Called when more output buffer space is available for this socket.
859 * We try not to wake our writers until they can make "significant"
860 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
861 * with a bunch of small requests.
863 static void xs_tcp_write_space(struct sock
*sk
)
865 read_lock(&sk
->sk_callback_lock
);
867 /* from net/core/stream.c:sk_stream_write_space */
868 if (sk_stream_wspace(sk
) >= sk_stream_min_wspace(sk
)) {
870 struct rpc_xprt
*xprt
;
872 if (unlikely(!(sock
= sk
->sk_socket
)))
874 if (unlikely(!(xprt
= xprt_from_sock(sk
))))
876 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE
, &sock
->flags
)))
879 xprt_write_space(xprt
);
883 read_unlock(&sk
->sk_callback_lock
);
886 static void xs_udp_do_set_buffer_size(struct rpc_xprt
*xprt
)
888 struct sock
*sk
= xprt
->inet
;
891 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
892 sk
->sk_rcvbuf
= xprt
->rcvsize
* xprt
->max_reqs
* 2;
895 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
896 sk
->sk_sndbuf
= xprt
->sndsize
* xprt
->max_reqs
* 2;
897 sk
->sk_write_space(sk
);
902 * xs_udp_set_buffer_size - set send and receive limits
903 * @xprt: generic transport
904 * @sndsize: requested size of send buffer, in bytes
905 * @rcvsize: requested size of receive buffer, in bytes
907 * Set socket send and receive buffer size limits.
909 static void xs_udp_set_buffer_size(struct rpc_xprt
*xprt
, size_t sndsize
, size_t rcvsize
)
913 xprt
->sndsize
= sndsize
+ 1024;
916 xprt
->rcvsize
= rcvsize
+ 1024;
918 xs_udp_do_set_buffer_size(xprt
);
922 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
923 * @task: task that timed out
925 * Adjust the congestion window after a retransmit timeout has occurred.
927 static void xs_udp_timer(struct rpc_task
*task
)
929 xprt_adjust_cwnd(task
, -ETIMEDOUT
);
933 * xs_set_port - reset the port number in the remote endpoint address
934 * @xprt: generic transport
935 * @port: new port number
938 static void xs_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
940 dprintk("RPC: setting port for xprt %p to %u\n", xprt
, port
);
941 xprt
->addr
.sin_port
= htons(port
);
944 static int xs_bindresvport(struct rpc_xprt
*xprt
, struct socket
*sock
)
946 struct sockaddr_in myaddr
= {
947 .sin_family
= AF_INET
,
950 unsigned short port
= xprt
->port
;
953 myaddr
.sin_port
= htons(port
);
954 err
= sock
->ops
->bind(sock
, (struct sockaddr
*) &myaddr
,
958 dprintk("RPC: xs_bindresvport bound to port %u\n",
962 if (port
<= xprt_min_resvport
)
963 port
= xprt_max_resvport
;
966 } while (err
== -EADDRINUSE
&& port
!= xprt
->port
);
968 dprintk("RPC: can't bind to reserved port (%d).\n", -err
);
973 * xs_udp_connect_worker - set up a UDP socket
974 * @args: RPC transport to connect
976 * Invoked by a work queue tasklet.
978 static void xs_udp_connect_worker(void *args
)
980 struct rpc_xprt
*xprt
= (struct rpc_xprt
*) args
;
981 struct socket
*sock
= xprt
->sock
;
982 int err
, status
= -EIO
;
984 if (xprt
->shutdown
|| xprt
->addr
.sin_port
== 0)
987 dprintk("RPC: xs_udp_connect_worker for xprt %p\n", xprt
);
989 /* Start by resetting any existing state */
992 if ((err
= sock_create_kern(PF_INET
, SOCK_DGRAM
, IPPROTO_UDP
, &sock
)) < 0) {
993 dprintk("RPC: can't create UDP transport socket (%d).\n", -err
);
997 if (xprt
->resvport
&& xs_bindresvport(xprt
, sock
) < 0) {
1003 struct sock
*sk
= sock
->sk
;
1005 write_lock_bh(&sk
->sk_callback_lock
);
1007 sk
->sk_user_data
= xprt
;
1008 xprt
->old_data_ready
= sk
->sk_data_ready
;
1009 xprt
->old_state_change
= sk
->sk_state_change
;
1010 xprt
->old_write_space
= sk
->sk_write_space
;
1011 sk
->sk_data_ready
= xs_udp_data_ready
;
1012 sk
->sk_write_space
= xs_udp_write_space
;
1013 sk
->sk_no_check
= UDP_CSUM_NORCV
;
1014 sk
->sk_allocation
= GFP_ATOMIC
;
1016 xprt_set_connected(xprt
);
1018 /* Reset to new socket */
1022 write_unlock_bh(&sk
->sk_callback_lock
);
1024 xs_udp_do_set_buffer_size(xprt
);
1027 xprt_wake_pending_tasks(xprt
, status
);
1028 xprt_clear_connecting(xprt
);
1032 * We need to preserve the port number so the reply cache on the server can
1033 * find our cached RPC replies when we get around to reconnecting.
1035 static void xs_tcp_reuse_connection(struct rpc_xprt
*xprt
)
1038 struct socket
*sock
= xprt
->sock
;
1039 struct sockaddr any
;
1041 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt
);
1044 * Disconnect the transport socket by doing a connect operation
1045 * with AF_UNSPEC. This should return immediately...
1047 memset(&any
, 0, sizeof(any
));
1048 any
.sa_family
= AF_UNSPEC
;
1049 result
= sock
->ops
->connect(sock
, &any
, sizeof(any
), 0);
1051 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1056 * xs_tcp_connect_worker - connect a TCP socket to a remote endpoint
1057 * @args: RPC transport to connect
1059 * Invoked by a work queue tasklet.
1061 static void xs_tcp_connect_worker(void *args
)
1063 struct rpc_xprt
*xprt
= (struct rpc_xprt
*)args
;
1064 struct socket
*sock
= xprt
->sock
;
1065 int err
, status
= -EIO
;
1067 if (xprt
->shutdown
|| xprt
->addr
.sin_port
== 0)
1070 dprintk("RPC: xs_tcp_connect_worker for xprt %p\n", xprt
);
1073 /* start from scratch */
1074 if ((err
= sock_create_kern(PF_INET
, SOCK_STREAM
, IPPROTO_TCP
, &sock
)) < 0) {
1075 dprintk("RPC: can't create TCP transport socket (%d).\n", -err
);
1079 if (xprt
->resvport
&& xs_bindresvport(xprt
, sock
) < 0) {
1084 /* "close" the socket, preserving the local port */
1085 xs_tcp_reuse_connection(xprt
);
1088 struct sock
*sk
= sock
->sk
;
1090 write_lock_bh(&sk
->sk_callback_lock
);
1092 sk
->sk_user_data
= xprt
;
1093 xprt
->old_data_ready
= sk
->sk_data_ready
;
1094 xprt
->old_state_change
= sk
->sk_state_change
;
1095 xprt
->old_write_space
= sk
->sk_write_space
;
1096 sk
->sk_data_ready
= xs_tcp_data_ready
;
1097 sk
->sk_state_change
= xs_tcp_state_change
;
1098 sk
->sk_write_space
= xs_tcp_write_space
;
1099 sk
->sk_allocation
= GFP_ATOMIC
;
1101 /* socket options */
1102 sk
->sk_userlocks
|= SOCK_BINDPORT_LOCK
;
1103 sock_reset_flag(sk
, SOCK_LINGER
);
1104 tcp_sk(sk
)->linger2
= 0;
1105 tcp_sk(sk
)->nonagle
|= TCP_NAGLE_OFF
;
1107 xprt_clear_connected(xprt
);
1109 /* Reset to new socket */
1113 write_unlock_bh(&sk
->sk_callback_lock
);
1116 /* Tell the socket layer to start connecting... */
1117 status
= sock
->ops
->connect(sock
, (struct sockaddr
*) &xprt
->addr
,
1118 sizeof(xprt
->addr
), O_NONBLOCK
);
1119 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1120 xprt
, -status
, xprt_connected(xprt
), sock
->sk
->sk_state
);
1128 /* retry with existing socket, after a delay */
1131 /* get rid of existing socket, and retry */
1137 xprt_wake_pending_tasks(xprt
, status
);
1139 xprt_clear_connecting(xprt
);
1143 * xs_connect - connect a socket to a remote endpoint
1144 * @task: address of RPC task that manages state of connect request
1146 * TCP: If the remote end dropped the connection, delay reconnecting.
1148 * UDP socket connects are synchronous, but we use a work queue anyway
1149 * to guarantee that even unprivileged user processes can set up a
1150 * socket on a privileged port.
1152 * If a UDP socket connect fails, the delay behavior here prevents
1153 * retry floods (hard mounts).
1155 static void xs_connect(struct rpc_task
*task
)
1157 struct rpc_xprt
*xprt
= task
->tk_xprt
;
1159 if (xprt_test_and_set_connecting(xprt
))
1162 if (xprt
->sock
!= NULL
) {
1163 dprintk("RPC: xs_connect delayed xprt %p for %lu seconds\n",
1164 xprt
, xprt
->reestablish_timeout
/ HZ
);
1165 schedule_delayed_work(&xprt
->connect_worker
,
1166 xprt
->reestablish_timeout
);
1167 xprt
->reestablish_timeout
<<= 1;
1168 if (xprt
->reestablish_timeout
> XS_TCP_MAX_REEST_TO
)
1169 xprt
->reestablish_timeout
= XS_TCP_MAX_REEST_TO
;
1171 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt
);
1172 schedule_work(&xprt
->connect_worker
);
1174 /* flush_scheduled_work can sleep... */
1175 if (!RPC_IS_ASYNC(task
))
1176 flush_scheduled_work();
1180 static struct rpc_xprt_ops xs_udp_ops
= {
1181 .set_buffer_size
= xs_udp_set_buffer_size
,
1182 .reserve_xprt
= xprt_reserve_xprt_cong
,
1183 .release_xprt
= xprt_release_xprt_cong
,
1184 .set_port
= xs_set_port
,
1185 .connect
= xs_connect
,
1186 .buf_alloc
= rpc_malloc
,
1187 .buf_free
= rpc_free
,
1188 .send_request
= xs_udp_send_request
,
1189 .set_retrans_timeout
= xprt_set_retrans_timeout_rtt
,
1190 .timer
= xs_udp_timer
,
1191 .release_request
= xprt_release_rqst_cong
,
1193 .destroy
= xs_destroy
,
1196 static struct rpc_xprt_ops xs_tcp_ops
= {
1197 .reserve_xprt
= xprt_reserve_xprt
,
1198 .release_xprt
= xprt_release_xprt
,
1199 .set_port
= xs_set_port
,
1200 .connect
= xs_connect
,
1201 .buf_alloc
= rpc_malloc
,
1202 .buf_free
= rpc_free
,
1203 .send_request
= xs_tcp_send_request
,
1204 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
1206 .destroy
= xs_destroy
,
1210 * xs_setup_udp - Set up transport to use a UDP socket
1211 * @xprt: transport to set up
1212 * @to: timeout parameters
1215 int xs_setup_udp(struct rpc_xprt
*xprt
, struct rpc_timeout
*to
)
1217 size_t slot_table_size
;
1219 dprintk("RPC: setting up udp-ipv4 transport...\n");
1221 xprt
->max_reqs
= xprt_udp_slot_table_entries
;
1222 slot_table_size
= xprt
->max_reqs
* sizeof(xprt
->slot
[0]);
1223 xprt
->slot
= kmalloc(slot_table_size
, GFP_KERNEL
);
1224 if (xprt
->slot
== NULL
)
1226 memset(xprt
->slot
, 0, slot_table_size
);
1228 xprt
->prot
= IPPROTO_UDP
;
1229 xprt
->port
= xprt_max_resvport
;
1231 xprt
->resvport
= capable(CAP_NET_BIND_SERVICE
) ? 1 : 0;
1232 /* XXX: header size can vary due to auth type, IPv6, etc. */
1233 xprt
->max_payload
= (1U << 16) - (MAX_HEADER
<< 3);
1235 INIT_WORK(&xprt
->connect_worker
, xs_udp_connect_worker
, xprt
);
1236 xprt
->bind_timeout
= XS_BIND_TO
;
1237 xprt
->connect_timeout
= XS_UDP_CONN_TO
;
1238 xprt
->reestablish_timeout
= XS_UDP_REEST_TO
;
1239 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
1241 xprt
->ops
= &xs_udp_ops
;
1244 xprt
->timeout
= *to
;
1246 xprt_set_timeout(&xprt
->timeout
, 5, 5 * HZ
);
1252 * xs_setup_tcp - Set up transport to use a TCP socket
1253 * @xprt: transport to set up
1254 * @to: timeout parameters
1257 int xs_setup_tcp(struct rpc_xprt
*xprt
, struct rpc_timeout
*to
)
1259 size_t slot_table_size
;
1261 dprintk("RPC: setting up tcp-ipv4 transport...\n");
1263 xprt
->max_reqs
= xprt_tcp_slot_table_entries
;
1264 slot_table_size
= xprt
->max_reqs
* sizeof(xprt
->slot
[0]);
1265 xprt
->slot
= kmalloc(slot_table_size
, GFP_KERNEL
);
1266 if (xprt
->slot
== NULL
)
1268 memset(xprt
->slot
, 0, slot_table_size
);
1270 xprt
->prot
= IPPROTO_TCP
;
1271 xprt
->port
= xprt_max_resvport
;
1272 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
1273 xprt
->resvport
= capable(CAP_NET_BIND_SERVICE
) ? 1 : 0;
1274 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
1276 INIT_WORK(&xprt
->connect_worker
, xs_tcp_connect_worker
, xprt
);
1277 xprt
->bind_timeout
= XS_BIND_TO
;
1278 xprt
->connect_timeout
= XS_TCP_CONN_TO
;
1279 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
1280 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
1282 xprt
->ops
= &xs_tcp_ops
;
1285 xprt
->timeout
= *to
;
1287 xprt_set_timeout(&xprt
->timeout
, 2, 60 * HZ
);