2 * linux/net/sunrpc/xprtsock.c
4 * Client-side transport implementation for sockets.
6 * TCP callback races fixes (C) 1998 Red Hat
7 * TCP send fixes (C) 1998 Red Hat
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>
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
21 #include <linux/types.h>
22 #include <linux/string.h>
23 #include <linux/slab.h>
24 #include <linux/module.h>
25 #include <linux/capability.h>
26 #include <linux/pagemap.h>
27 #include <linux/errno.h>
28 #include <linux/socket.h>
30 #include <linux/net.h>
33 #include <linux/udp.h>
34 #include <linux/tcp.h>
35 #include <linux/sunrpc/clnt.h>
36 #include <linux/sunrpc/addr.h>
37 #include <linux/sunrpc/sched.h>
38 #include <linux/sunrpc/svcsock.h>
39 #include <linux/sunrpc/xprtsock.h>
40 #include <linux/file.h>
41 #ifdef CONFIG_SUNRPC_BACKCHANNEL
42 #include <linux/sunrpc/bc_xprt.h>
46 #include <net/checksum.h>
50 #include <trace/events/sunrpc.h>
54 static void xs_close(struct rpc_xprt
*xprt
);
59 static unsigned int xprt_udp_slot_table_entries
= RPC_DEF_SLOT_TABLE
;
60 static unsigned int xprt_tcp_slot_table_entries
= RPC_MIN_SLOT_TABLE
;
61 static unsigned int xprt_max_tcp_slot_table_entries
= RPC_MAX_SLOT_TABLE
;
63 static unsigned int xprt_min_resvport
= RPC_DEF_MIN_RESVPORT
;
64 static unsigned int xprt_max_resvport
= RPC_DEF_MAX_RESVPORT
;
66 #define XS_TCP_LINGER_TO (15U * HZ)
67 static unsigned int xs_tcp_fin_timeout __read_mostly
= XS_TCP_LINGER_TO
;
70 * We can register our own files under /proc/sys/sunrpc by
71 * calling register_sysctl_table() again. The files in that
72 * directory become the union of all files registered there.
74 * We simply need to make sure that we don't collide with
75 * someone else's file names!
80 static unsigned int min_slot_table_size
= RPC_MIN_SLOT_TABLE
;
81 static unsigned int max_slot_table_size
= RPC_MAX_SLOT_TABLE
;
82 static unsigned int max_tcp_slot_table_limit
= RPC_MAX_SLOT_TABLE_LIMIT
;
83 static unsigned int xprt_min_resvport_limit
= RPC_MIN_RESVPORT
;
84 static unsigned int xprt_max_resvport_limit
= RPC_MAX_RESVPORT
;
86 static struct ctl_table_header
*sunrpc_table_header
;
89 * FIXME: changing the UDP slot table size should also resize the UDP
90 * socket buffers for existing UDP transports
92 static struct ctl_table xs_tunables_table
[] = {
94 .procname
= "udp_slot_table_entries",
95 .data
= &xprt_udp_slot_table_entries
,
96 .maxlen
= sizeof(unsigned int),
98 .proc_handler
= proc_dointvec_minmax
,
99 .extra1
= &min_slot_table_size
,
100 .extra2
= &max_slot_table_size
103 .procname
= "tcp_slot_table_entries",
104 .data
= &xprt_tcp_slot_table_entries
,
105 .maxlen
= sizeof(unsigned int),
107 .proc_handler
= proc_dointvec_minmax
,
108 .extra1
= &min_slot_table_size
,
109 .extra2
= &max_slot_table_size
112 .procname
= "tcp_max_slot_table_entries",
113 .data
= &xprt_max_tcp_slot_table_entries
,
114 .maxlen
= sizeof(unsigned int),
116 .proc_handler
= proc_dointvec_minmax
,
117 .extra1
= &min_slot_table_size
,
118 .extra2
= &max_tcp_slot_table_limit
121 .procname
= "min_resvport",
122 .data
= &xprt_min_resvport
,
123 .maxlen
= sizeof(unsigned int),
125 .proc_handler
= proc_dointvec_minmax
,
126 .extra1
= &xprt_min_resvport_limit
,
127 .extra2
= &xprt_max_resvport_limit
130 .procname
= "max_resvport",
131 .data
= &xprt_max_resvport
,
132 .maxlen
= sizeof(unsigned int),
134 .proc_handler
= proc_dointvec_minmax
,
135 .extra1
= &xprt_min_resvport_limit
,
136 .extra2
= &xprt_max_resvport_limit
139 .procname
= "tcp_fin_timeout",
140 .data
= &xs_tcp_fin_timeout
,
141 .maxlen
= sizeof(xs_tcp_fin_timeout
),
143 .proc_handler
= proc_dointvec_jiffies
,
148 static struct ctl_table sunrpc_table
[] = {
150 .procname
= "sunrpc",
152 .child
= xs_tunables_table
160 * Wait duration for a reply from the RPC portmapper.
162 #define XS_BIND_TO (60U * HZ)
165 * Delay if a UDP socket connect error occurs. This is most likely some
166 * kind of resource problem on the local host.
168 #define XS_UDP_REEST_TO (2U * HZ)
171 * The reestablish timeout allows clients to delay for a bit before attempting
172 * to reconnect to a server that just dropped our connection.
174 * We implement an exponential backoff when trying to reestablish a TCP
175 * transport connection with the server. Some servers like to drop a TCP
176 * connection when they are overworked, so we start with a short timeout and
177 * increase over time if the server is down or not responding.
179 #define XS_TCP_INIT_REEST_TO (3U * HZ)
180 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
183 * TCP idle timeout; client drops the transport socket if it is idle
184 * for this long. Note that we also timeout UDP sockets to prevent
185 * holding port numbers when there is no RPC traffic.
187 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
190 # undef RPC_DEBUG_DATA
191 # define RPCDBG_FACILITY RPCDBG_TRANS
194 #ifdef RPC_DEBUG_DATA
195 static void xs_pktdump(char *msg
, u32
*packet
, unsigned int count
)
197 u8
*buf
= (u8
*) packet
;
200 dprintk("RPC: %s\n", msg
);
201 for (j
= 0; j
< count
&& j
< 128; j
+= 4) {
205 dprintk("0x%04x ", j
);
207 dprintk("%02x%02x%02x%02x ",
208 buf
[j
], buf
[j
+1], buf
[j
+2], buf
[j
+3]);
213 static inline void xs_pktdump(char *msg
, u32
*packet
, unsigned int count
)
220 struct rpc_xprt xprt
;
225 struct socket
* sock
;
229 * State of TCP reply receive
238 unsigned long tcp_copied
,
242 * Connection of transports
244 struct delayed_work connect_worker
;
245 struct sockaddr_storage srcaddr
;
246 unsigned short srcport
;
249 * UDP socket buffer size parameters
255 * Saved socket callback addresses
257 void (*old_data_ready
)(struct sock
*);
258 void (*old_state_change
)(struct sock
*);
259 void (*old_write_space
)(struct sock
*);
260 void (*old_error_report
)(struct sock
*);
264 * TCP receive state flags
266 #define TCP_RCV_LAST_FRAG (1UL << 0)
267 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
268 #define TCP_RCV_COPY_XID (1UL << 2)
269 #define TCP_RCV_COPY_DATA (1UL << 3)
270 #define TCP_RCV_READ_CALLDIR (1UL << 4)
271 #define TCP_RCV_COPY_CALLDIR (1UL << 5)
276 #define TCP_RPC_REPLY (1UL << 6)
278 static inline struct rpc_xprt
*xprt_from_sock(struct sock
*sk
)
280 return (struct rpc_xprt
*) sk
->sk_user_data
;
283 static inline struct sockaddr
*xs_addr(struct rpc_xprt
*xprt
)
285 return (struct sockaddr
*) &xprt
->addr
;
288 static inline struct sockaddr_un
*xs_addr_un(struct rpc_xprt
*xprt
)
290 return (struct sockaddr_un
*) &xprt
->addr
;
293 static inline struct sockaddr_in
*xs_addr_in(struct rpc_xprt
*xprt
)
295 return (struct sockaddr_in
*) &xprt
->addr
;
298 static inline struct sockaddr_in6
*xs_addr_in6(struct rpc_xprt
*xprt
)
300 return (struct sockaddr_in6
*) &xprt
->addr
;
303 static void xs_format_common_peer_addresses(struct rpc_xprt
*xprt
)
305 struct sockaddr
*sap
= xs_addr(xprt
);
306 struct sockaddr_in6
*sin6
;
307 struct sockaddr_in
*sin
;
308 struct sockaddr_un
*sun
;
311 switch (sap
->sa_family
) {
313 sun
= xs_addr_un(xprt
);
314 strlcpy(buf
, sun
->sun_path
, sizeof(buf
));
315 xprt
->address_strings
[RPC_DISPLAY_ADDR
] =
316 kstrdup(buf
, GFP_KERNEL
);
319 (void)rpc_ntop(sap
, buf
, sizeof(buf
));
320 xprt
->address_strings
[RPC_DISPLAY_ADDR
] =
321 kstrdup(buf
, GFP_KERNEL
);
322 sin
= xs_addr_in(xprt
);
323 snprintf(buf
, sizeof(buf
), "%08x", ntohl(sin
->sin_addr
.s_addr
));
326 (void)rpc_ntop(sap
, buf
, sizeof(buf
));
327 xprt
->address_strings
[RPC_DISPLAY_ADDR
] =
328 kstrdup(buf
, GFP_KERNEL
);
329 sin6
= xs_addr_in6(xprt
);
330 snprintf(buf
, sizeof(buf
), "%pi6", &sin6
->sin6_addr
);
336 xprt
->address_strings
[RPC_DISPLAY_HEX_ADDR
] = kstrdup(buf
, GFP_KERNEL
);
339 static void xs_format_common_peer_ports(struct rpc_xprt
*xprt
)
341 struct sockaddr
*sap
= xs_addr(xprt
);
344 snprintf(buf
, sizeof(buf
), "%u", rpc_get_port(sap
));
345 xprt
->address_strings
[RPC_DISPLAY_PORT
] = kstrdup(buf
, GFP_KERNEL
);
347 snprintf(buf
, sizeof(buf
), "%4hx", rpc_get_port(sap
));
348 xprt
->address_strings
[RPC_DISPLAY_HEX_PORT
] = kstrdup(buf
, GFP_KERNEL
);
351 static void xs_format_peer_addresses(struct rpc_xprt
*xprt
,
352 const char *protocol
,
355 xprt
->address_strings
[RPC_DISPLAY_PROTO
] = protocol
;
356 xprt
->address_strings
[RPC_DISPLAY_NETID
] = netid
;
357 xs_format_common_peer_addresses(xprt
);
358 xs_format_common_peer_ports(xprt
);
361 static void xs_update_peer_port(struct rpc_xprt
*xprt
)
363 kfree(xprt
->address_strings
[RPC_DISPLAY_HEX_PORT
]);
364 kfree(xprt
->address_strings
[RPC_DISPLAY_PORT
]);
366 xs_format_common_peer_ports(xprt
);
369 static void xs_free_peer_addresses(struct rpc_xprt
*xprt
)
373 for (i
= 0; i
< RPC_DISPLAY_MAX
; i
++)
375 case RPC_DISPLAY_PROTO
:
376 case RPC_DISPLAY_NETID
:
379 kfree(xprt
->address_strings
[i
]);
383 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
385 static int xs_send_kvec(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
, struct kvec
*vec
, unsigned int base
, int more
)
387 struct msghdr msg
= {
389 .msg_namelen
= addrlen
,
390 .msg_flags
= XS_SENDMSG_FLAGS
| (more
? MSG_MORE
: 0),
393 .iov_base
= vec
->iov_base
+ base
,
394 .iov_len
= vec
->iov_len
- base
,
397 if (iov
.iov_len
!= 0)
398 return kernel_sendmsg(sock
, &msg
, &iov
, 1, iov
.iov_len
);
399 return kernel_sendmsg(sock
, &msg
, NULL
, 0, 0);
402 static int xs_send_pagedata(struct socket
*sock
, struct xdr_buf
*xdr
, unsigned int base
, int more
, bool zerocopy
, int *sent_p
)
404 ssize_t (*do_sendpage
)(struct socket
*sock
, struct page
*page
,
405 int offset
, size_t size
, int flags
);
407 unsigned int remainder
;
410 remainder
= xdr
->page_len
- base
;
411 base
+= xdr
->page_base
;
412 ppage
= xdr
->pages
+ (base
>> PAGE_SHIFT
);
414 do_sendpage
= sock
->ops
->sendpage
;
416 do_sendpage
= sock_no_sendpage
;
418 unsigned int len
= min_t(unsigned int, PAGE_SIZE
- base
, remainder
);
419 int flags
= XS_SENDMSG_FLAGS
;
422 if (remainder
!= 0 || more
)
424 err
= do_sendpage(sock
, *ppage
, base
, len
, flags
);
425 if (remainder
== 0 || err
!= len
)
439 * xs_sendpages - write pages directly to a socket
440 * @sock: socket to send on
441 * @addr: UDP only -- address of destination
442 * @addrlen: UDP only -- length of destination address
443 * @xdr: buffer containing this request
444 * @base: starting position in the buffer
445 * @zerocopy: true if it is safe to use sendpage()
446 * @sent_p: return the total number of bytes successfully queued for sending
449 static int xs_sendpages(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
, struct xdr_buf
*xdr
, unsigned int base
, bool zerocopy
, int *sent_p
)
451 unsigned int remainder
= xdr
->len
- base
;
458 clear_bit(SOCK_ASYNC_NOSPACE
, &sock
->flags
);
464 if (base
< xdr
->head
[0].iov_len
|| addr
!= NULL
) {
465 unsigned int len
= xdr
->head
[0].iov_len
- base
;
467 err
= xs_send_kvec(sock
, addr
, addrlen
, &xdr
->head
[0], base
, remainder
!= 0);
468 if (remainder
== 0 || err
!= len
)
473 base
-= xdr
->head
[0].iov_len
;
475 if (base
< xdr
->page_len
) {
476 unsigned int len
= xdr
->page_len
- base
;
478 err
= xs_send_pagedata(sock
, xdr
, base
, remainder
!= 0, zerocopy
, &sent
);
480 if (remainder
== 0 || sent
!= len
)
484 base
-= xdr
->page_len
;
486 if (base
>= xdr
->tail
[0].iov_len
)
488 err
= xs_send_kvec(sock
, NULL
, 0, &xdr
->tail
[0], base
, 0);
497 static void xs_nospace_callback(struct rpc_task
*task
)
499 struct sock_xprt
*transport
= container_of(task
->tk_rqstp
->rq_xprt
, struct sock_xprt
, xprt
);
501 transport
->inet
->sk_write_pending
--;
502 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
506 * xs_nospace - place task on wait queue if transmit was incomplete
507 * @task: task to put to sleep
510 static int xs_nospace(struct rpc_task
*task
)
512 struct rpc_rqst
*req
= task
->tk_rqstp
;
513 struct rpc_xprt
*xprt
= req
->rq_xprt
;
514 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
515 struct sock
*sk
= transport
->inet
;
518 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
519 task
->tk_pid
, req
->rq_slen
- req
->rq_bytes_sent
,
522 /* Protect against races with write_space */
523 spin_lock_bh(&xprt
->transport_lock
);
525 /* Don't race with disconnect */
526 if (xprt_connected(xprt
)) {
527 if (test_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
)) {
529 * Notify TCP that we're limited by the application
532 set_bit(SOCK_NOSPACE
, &transport
->sock
->flags
);
533 sk
->sk_write_pending
++;
534 /* ...and wait for more buffer space */
535 xprt_wait_for_buffer_space(task
, xs_nospace_callback
);
538 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
542 spin_unlock_bh(&xprt
->transport_lock
);
544 /* Race breaker in case memory is freed before above code is called */
545 sk
->sk_write_space(sk
);
550 * Construct a stream transport record marker in @buf.
552 static inline void xs_encode_stream_record_marker(struct xdr_buf
*buf
)
554 u32 reclen
= buf
->len
- sizeof(rpc_fraghdr
);
555 rpc_fraghdr
*base
= buf
->head
[0].iov_base
;
556 *base
= cpu_to_be32(RPC_LAST_STREAM_FRAGMENT
| reclen
);
560 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
561 * @task: RPC task that manages the state of an RPC request
564 * 0: The request has been sent
565 * EAGAIN: The socket was blocked, please call again later to
566 * complete the request
567 * ENOTCONN: Caller needs to invoke connect logic then call again
568 * other: Some other error occured, the request was not sent
570 static int xs_local_send_request(struct rpc_task
*task
)
572 struct rpc_rqst
*req
= task
->tk_rqstp
;
573 struct rpc_xprt
*xprt
= req
->rq_xprt
;
574 struct sock_xprt
*transport
=
575 container_of(xprt
, struct sock_xprt
, xprt
);
576 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
580 xs_encode_stream_record_marker(&req
->rq_snd_buf
);
582 xs_pktdump("packet data:",
583 req
->rq_svec
->iov_base
, req
->rq_svec
->iov_len
);
585 status
= xs_sendpages(transport
->sock
, NULL
, 0, xdr
, req
->rq_bytes_sent
,
587 dprintk("RPC: %s(%u) = %d\n",
588 __func__
, xdr
->len
- req
->rq_bytes_sent
, status
);
589 if (likely(sent
> 0) || status
== 0) {
590 req
->rq_bytes_sent
+= sent
;
591 req
->rq_xmit_bytes_sent
+= sent
;
592 if (likely(req
->rq_bytes_sent
>= req
->rq_slen
)) {
593 req
->rq_bytes_sent
= 0;
602 status
= xs_nospace(task
);
605 dprintk("RPC: sendmsg returned unrecognized error %d\n",
616 * xs_udp_send_request - write an RPC request to a UDP socket
617 * @task: address of RPC task that manages the state of an RPC request
620 * 0: The request has been sent
621 * EAGAIN: The socket was blocked, please call again later to
622 * complete the request
623 * ENOTCONN: Caller needs to invoke connect logic then call again
624 * other: Some other error occurred, the request was not sent
626 static int xs_udp_send_request(struct rpc_task
*task
)
628 struct rpc_rqst
*req
= task
->tk_rqstp
;
629 struct rpc_xprt
*xprt
= req
->rq_xprt
;
630 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
631 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
635 xs_pktdump("packet data:",
636 req
->rq_svec
->iov_base
,
637 req
->rq_svec
->iov_len
);
639 if (!xprt_bound(xprt
))
641 status
= xs_sendpages(transport
->sock
, xs_addr(xprt
), xprt
->addrlen
,
642 xdr
, req
->rq_bytes_sent
, true, &sent
);
644 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
645 xdr
->len
- req
->rq_bytes_sent
, status
);
647 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
648 if (status
== -EPERM
)
651 if (sent
> 0 || status
== 0) {
652 req
->rq_xmit_bytes_sent
+= sent
;
653 if (sent
>= req
->rq_slen
)
655 /* Still some bytes left; set up for a retry later. */
663 /* Should we call xs_close() here? */
666 status
= xs_nospace(task
);
669 dprintk("RPC: sendmsg returned unrecognized error %d\n",
676 /* When the server has died, an ICMP port unreachable message
677 * prompts ECONNREFUSED. */
678 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
685 * xs_tcp_shutdown - gracefully shut down a TCP socket
688 * Initiates a graceful shutdown of the TCP socket by calling the
689 * equivalent of shutdown(SHUT_WR);
691 static void xs_tcp_shutdown(struct rpc_xprt
*xprt
)
693 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
694 struct socket
*sock
= transport
->sock
;
697 kernel_sock_shutdown(sock
, SHUT_WR
);
698 trace_rpc_socket_shutdown(xprt
, sock
);
703 * xs_tcp_send_request - write an RPC request to a TCP socket
704 * @task: address of RPC task that manages the state of an RPC request
707 * 0: The request has been sent
708 * EAGAIN: The socket was blocked, please call again later to
709 * complete the request
710 * ENOTCONN: Caller needs to invoke connect logic then call again
711 * other: Some other error occurred, the request was not sent
713 * XXX: In the case of soft timeouts, should we eventually give up
714 * if sendmsg is not able to make progress?
716 static int xs_tcp_send_request(struct rpc_task
*task
)
718 struct rpc_rqst
*req
= task
->tk_rqstp
;
719 struct rpc_xprt
*xprt
= req
->rq_xprt
;
720 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
721 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
722 bool zerocopy
= true;
726 xs_encode_stream_record_marker(&req
->rq_snd_buf
);
728 xs_pktdump("packet data:",
729 req
->rq_svec
->iov_base
,
730 req
->rq_svec
->iov_len
);
731 /* Don't use zero copy if this is a resend. If the RPC call
732 * completes while the socket holds a reference to the pages,
733 * then we may end up resending corrupted data.
735 if (task
->tk_flags
& RPC_TASK_SENT
)
738 /* Continue transmitting the packet/record. We must be careful
739 * to cope with writespace callbacks arriving _after_ we have
740 * called sendmsg(). */
743 status
= xs_sendpages(transport
->sock
, NULL
, 0, xdr
,
744 req
->rq_bytes_sent
, zerocopy
, &sent
);
746 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
747 xdr
->len
- req
->rq_bytes_sent
, status
);
749 if (unlikely(sent
== 0 && status
< 0))
752 /* If we've sent the entire packet, immediately
753 * reset the count of bytes sent. */
754 req
->rq_bytes_sent
+= sent
;
755 req
->rq_xmit_bytes_sent
+= sent
;
756 if (likely(req
->rq_bytes_sent
>= req
->rq_slen
)) {
757 req
->rq_bytes_sent
= 0;
770 /* Should we call xs_close() here? */
774 status
= xs_nospace(task
);
777 dprintk("RPC: sendmsg returned unrecognized error %d\n",
780 xs_tcp_shutdown(xprt
);
784 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
791 * xs_tcp_release_xprt - clean up after a tcp transmission
795 * This cleans up if an error causes us to abort the transmission of a request.
796 * In this case, the socket may need to be reset in order to avoid confusing
799 static void xs_tcp_release_xprt(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
801 struct rpc_rqst
*req
;
803 if (task
!= xprt
->snd_task
)
807 req
= task
->tk_rqstp
;
810 if (req
->rq_bytes_sent
== 0)
812 if (req
->rq_bytes_sent
== req
->rq_snd_buf
.len
)
814 set_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
816 xprt_release_xprt(xprt
, task
);
819 static void xs_save_old_callbacks(struct sock_xprt
*transport
, struct sock
*sk
)
821 transport
->old_data_ready
= sk
->sk_data_ready
;
822 transport
->old_state_change
= sk
->sk_state_change
;
823 transport
->old_write_space
= sk
->sk_write_space
;
824 transport
->old_error_report
= sk
->sk_error_report
;
827 static void xs_restore_old_callbacks(struct sock_xprt
*transport
, struct sock
*sk
)
829 sk
->sk_data_ready
= transport
->old_data_ready
;
830 sk
->sk_state_change
= transport
->old_state_change
;
831 sk
->sk_write_space
= transport
->old_write_space
;
832 sk
->sk_error_report
= transport
->old_error_report
;
836 * xs_error_report - callback to handle TCP socket state errors
839 * Note: we don't call sock_error() since there may be a rpc_task
840 * using the socket, and so we don't want to clear sk->sk_err.
842 static void xs_error_report(struct sock
*sk
)
844 struct rpc_xprt
*xprt
;
847 read_lock_bh(&sk
->sk_callback_lock
);
848 if (!(xprt
= xprt_from_sock(sk
)))
854 dprintk("RPC: xs_error_report client %p, error=%d...\n",
856 trace_rpc_socket_error(xprt
, sk
->sk_socket
, err
);
857 if (test_bit(XPRT_CONNECTION_REUSE
, &xprt
->state
))
859 xprt_wake_pending_tasks(xprt
, err
);
861 read_unlock_bh(&sk
->sk_callback_lock
);
864 static void xs_reset_transport(struct sock_xprt
*transport
)
866 struct socket
*sock
= transport
->sock
;
867 struct sock
*sk
= transport
->inet
;
872 transport
->srcport
= 0;
874 write_lock_bh(&sk
->sk_callback_lock
);
875 transport
->inet
= NULL
;
876 transport
->sock
= NULL
;
878 sk
->sk_user_data
= NULL
;
880 xs_restore_old_callbacks(transport
, sk
);
881 write_unlock_bh(&sk
->sk_callback_lock
);
883 trace_rpc_socket_close(&transport
->xprt
, sock
);
888 * xs_close - close a socket
891 * This is used when all requests are complete; ie, no DRC state remains
892 * on the server we want to save.
894 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
895 * xs_reset_transport() zeroing the socket from underneath a writer.
897 static void xs_close(struct rpc_xprt
*xprt
)
899 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
901 dprintk("RPC: xs_close xprt %p\n", xprt
);
903 cancel_delayed_work_sync(&transport
->connect_worker
);
905 xs_reset_transport(transport
);
906 xprt
->reestablish_timeout
= 0;
908 smp_mb__before_atomic();
909 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
910 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
911 clear_bit(XPRT_CLOSING
, &xprt
->state
);
912 smp_mb__after_atomic();
913 xprt_disconnect_done(xprt
);
916 static void xs_tcp_close(struct rpc_xprt
*xprt
)
918 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE
, &xprt
->state
))
921 xs_tcp_shutdown(xprt
);
924 static void xs_xprt_free(struct rpc_xprt
*xprt
)
926 xs_free_peer_addresses(xprt
);
931 * xs_destroy - prepare to shutdown a transport
932 * @xprt: doomed transport
935 static void xs_destroy(struct rpc_xprt
*xprt
)
937 dprintk("RPC: xs_destroy xprt %p\n", xprt
);
941 module_put(THIS_MODULE
);
944 static int xs_local_copy_to_xdr(struct xdr_buf
*xdr
, struct sk_buff
*skb
)
946 struct xdr_skb_reader desc
= {
948 .offset
= sizeof(rpc_fraghdr
),
949 .count
= skb
->len
- sizeof(rpc_fraghdr
),
952 if (xdr_partial_copy_from_skb(xdr
, 0, &desc
, xdr_skb_read_bits
) < 0)
960 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
961 * @sk: socket with data to read
962 * @len: how much data to read
964 * Currently this assumes we can read the whole reply in a single gulp.
966 static void xs_local_data_ready(struct sock
*sk
)
968 struct rpc_task
*task
;
969 struct rpc_xprt
*xprt
;
970 struct rpc_rqst
*rovr
;
972 int err
, repsize
, copied
;
976 read_lock_bh(&sk
->sk_callback_lock
);
977 dprintk("RPC: %s...\n", __func__
);
978 xprt
= xprt_from_sock(sk
);
982 skb
= skb_recv_datagram(sk
, 0, 1, &err
);
986 repsize
= skb
->len
- sizeof(rpc_fraghdr
);
988 dprintk("RPC: impossible RPC reply size %d\n", repsize
);
992 /* Copy the XID from the skb... */
993 xp
= skb_header_pointer(skb
, sizeof(rpc_fraghdr
), sizeof(_xid
), &_xid
);
997 /* Look up and lock the request corresponding to the given XID */
998 spin_lock(&xprt
->transport_lock
);
999 rovr
= xprt_lookup_rqst(xprt
, *xp
);
1002 task
= rovr
->rq_task
;
1004 copied
= rovr
->rq_private_buf
.buflen
;
1005 if (copied
> repsize
)
1008 if (xs_local_copy_to_xdr(&rovr
->rq_private_buf
, skb
)) {
1009 dprintk("RPC: sk_buff copy failed\n");
1013 xprt_complete_rqst(task
, copied
);
1016 spin_unlock(&xprt
->transport_lock
);
1018 skb_free_datagram(sk
, skb
);
1020 read_unlock_bh(&sk
->sk_callback_lock
);
1024 * xs_udp_data_ready - "data ready" callback for UDP sockets
1025 * @sk: socket with data to read
1026 * @len: how much data to read
1029 static void xs_udp_data_ready(struct sock
*sk
)
1031 struct rpc_task
*task
;
1032 struct rpc_xprt
*xprt
;
1033 struct rpc_rqst
*rovr
;
1034 struct sk_buff
*skb
;
1035 int err
, repsize
, copied
;
1039 read_lock_bh(&sk
->sk_callback_lock
);
1040 dprintk("RPC: xs_udp_data_ready...\n");
1041 if (!(xprt
= xprt_from_sock(sk
)))
1044 if ((skb
= skb_recv_datagram(sk
, 0, 1, &err
)) == NULL
)
1047 repsize
= skb
->len
- sizeof(struct udphdr
);
1049 dprintk("RPC: impossible RPC reply size %d!\n", repsize
);
1053 /* Copy the XID from the skb... */
1054 xp
= skb_header_pointer(skb
, sizeof(struct udphdr
),
1055 sizeof(_xid
), &_xid
);
1059 /* Look up and lock the request corresponding to the given XID */
1060 spin_lock(&xprt
->transport_lock
);
1061 rovr
= xprt_lookup_rqst(xprt
, *xp
);
1064 task
= rovr
->rq_task
;
1066 if ((copied
= rovr
->rq_private_buf
.buflen
) > repsize
)
1069 /* Suck it into the iovec, verify checksum if not done by hw. */
1070 if (csum_partial_copy_to_xdr(&rovr
->rq_private_buf
, skb
)) {
1071 UDPX_INC_STATS_BH(sk
, UDP_MIB_INERRORS
);
1075 UDPX_INC_STATS_BH(sk
, UDP_MIB_INDATAGRAMS
);
1077 xprt_adjust_cwnd(xprt
, task
, copied
);
1078 xprt_complete_rqst(task
, copied
);
1081 spin_unlock(&xprt
->transport_lock
);
1083 skb_free_datagram(sk
, skb
);
1085 read_unlock_bh(&sk
->sk_callback_lock
);
1089 * Helper function to force a TCP close if the server is sending
1090 * junk and/or it has put us in CLOSE_WAIT
1092 static void xs_tcp_force_close(struct rpc_xprt
*xprt
)
1094 set_bit(XPRT_CONNECTION_CLOSE
, &xprt
->state
);
1095 xprt_force_disconnect(xprt
);
1098 static inline void xs_tcp_read_fraghdr(struct rpc_xprt
*xprt
, struct xdr_skb_reader
*desc
)
1100 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1104 p
= ((char *) &transport
->tcp_fraghdr
) + transport
->tcp_offset
;
1105 len
= sizeof(transport
->tcp_fraghdr
) - transport
->tcp_offset
;
1106 used
= xdr_skb_read_bits(desc
, p
, len
);
1107 transport
->tcp_offset
+= used
;
1111 transport
->tcp_reclen
= ntohl(transport
->tcp_fraghdr
);
1112 if (transport
->tcp_reclen
& RPC_LAST_STREAM_FRAGMENT
)
1113 transport
->tcp_flags
|= TCP_RCV_LAST_FRAG
;
1115 transport
->tcp_flags
&= ~TCP_RCV_LAST_FRAG
;
1116 transport
->tcp_reclen
&= RPC_FRAGMENT_SIZE_MASK
;
1118 transport
->tcp_flags
&= ~TCP_RCV_COPY_FRAGHDR
;
1119 transport
->tcp_offset
= 0;
1121 /* Sanity check of the record length */
1122 if (unlikely(transport
->tcp_reclen
< 8)) {
1123 dprintk("RPC: invalid TCP record fragment length\n");
1124 xs_tcp_force_close(xprt
);
1127 dprintk("RPC: reading TCP record fragment of length %d\n",
1128 transport
->tcp_reclen
);
1131 static void xs_tcp_check_fraghdr(struct sock_xprt
*transport
)
1133 if (transport
->tcp_offset
== transport
->tcp_reclen
) {
1134 transport
->tcp_flags
|= TCP_RCV_COPY_FRAGHDR
;
1135 transport
->tcp_offset
= 0;
1136 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
) {
1137 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1138 transport
->tcp_flags
|= TCP_RCV_COPY_XID
;
1139 transport
->tcp_copied
= 0;
1144 static inline void xs_tcp_read_xid(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
1149 len
= sizeof(transport
->tcp_xid
) - transport
->tcp_offset
;
1150 dprintk("RPC: reading XID (%Zu bytes)\n", len
);
1151 p
= ((char *) &transport
->tcp_xid
) + transport
->tcp_offset
;
1152 used
= xdr_skb_read_bits(desc
, p
, len
);
1153 transport
->tcp_offset
+= used
;
1156 transport
->tcp_flags
&= ~TCP_RCV_COPY_XID
;
1157 transport
->tcp_flags
|= TCP_RCV_READ_CALLDIR
;
1158 transport
->tcp_copied
= 4;
1159 dprintk("RPC: reading %s XID %08x\n",
1160 (transport
->tcp_flags
& TCP_RPC_REPLY
) ? "reply for"
1162 ntohl(transport
->tcp_xid
));
1163 xs_tcp_check_fraghdr(transport
);
1166 static inline void xs_tcp_read_calldir(struct sock_xprt
*transport
,
1167 struct xdr_skb_reader
*desc
)
1174 * We want transport->tcp_offset to be 8 at the end of this routine
1175 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1176 * When this function is called for the first time,
1177 * transport->tcp_offset is 4 (after having already read the xid).
1179 offset
= transport
->tcp_offset
- sizeof(transport
->tcp_xid
);
1180 len
= sizeof(transport
->tcp_calldir
) - offset
;
1181 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len
);
1182 p
= ((char *) &transport
->tcp_calldir
) + offset
;
1183 used
= xdr_skb_read_bits(desc
, p
, len
);
1184 transport
->tcp_offset
+= used
;
1187 transport
->tcp_flags
&= ~TCP_RCV_READ_CALLDIR
;
1189 * We don't yet have the XDR buffer, so we will write the calldir
1190 * out after we get the buffer from the 'struct rpc_rqst'
1192 switch (ntohl(transport
->tcp_calldir
)) {
1194 transport
->tcp_flags
|= TCP_RCV_COPY_CALLDIR
;
1195 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
1196 transport
->tcp_flags
|= TCP_RPC_REPLY
;
1199 transport
->tcp_flags
|= TCP_RCV_COPY_CALLDIR
;
1200 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
1201 transport
->tcp_flags
&= ~TCP_RPC_REPLY
;
1204 dprintk("RPC: invalid request message type\n");
1205 xs_tcp_force_close(&transport
->xprt
);
1207 xs_tcp_check_fraghdr(transport
);
1210 static inline void xs_tcp_read_common(struct rpc_xprt
*xprt
,
1211 struct xdr_skb_reader
*desc
,
1212 struct rpc_rqst
*req
)
1214 struct sock_xprt
*transport
=
1215 container_of(xprt
, struct sock_xprt
, xprt
);
1216 struct xdr_buf
*rcvbuf
;
1220 rcvbuf
= &req
->rq_private_buf
;
1222 if (transport
->tcp_flags
& TCP_RCV_COPY_CALLDIR
) {
1224 * Save the RPC direction in the XDR buffer
1226 memcpy(rcvbuf
->head
[0].iov_base
+ transport
->tcp_copied
,
1227 &transport
->tcp_calldir
,
1228 sizeof(transport
->tcp_calldir
));
1229 transport
->tcp_copied
+= sizeof(transport
->tcp_calldir
);
1230 transport
->tcp_flags
&= ~TCP_RCV_COPY_CALLDIR
;
1234 if (len
> transport
->tcp_reclen
- transport
->tcp_offset
) {
1235 struct xdr_skb_reader my_desc
;
1237 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
1238 memcpy(&my_desc
, desc
, sizeof(my_desc
));
1239 my_desc
.count
= len
;
1240 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
1241 &my_desc
, xdr_skb_read_bits
);
1245 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
1246 desc
, xdr_skb_read_bits
);
1249 transport
->tcp_copied
+= r
;
1250 transport
->tcp_offset
+= r
;
1253 /* Error when copying to the receive buffer,
1254 * usually because we weren't able to allocate
1255 * additional buffer pages. All we can do now
1256 * is turn off TCP_RCV_COPY_DATA, so the request
1257 * will not receive any additional updates,
1259 * Any remaining data from this record will
1262 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1263 dprintk("RPC: XID %08x truncated request\n",
1264 ntohl(transport
->tcp_xid
));
1265 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1266 "tcp_offset = %u, tcp_reclen = %u\n",
1267 xprt
, transport
->tcp_copied
,
1268 transport
->tcp_offset
, transport
->tcp_reclen
);
1272 dprintk("RPC: XID %08x read %Zd bytes\n",
1273 ntohl(transport
->tcp_xid
), r
);
1274 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1275 "tcp_reclen = %u\n", xprt
, transport
->tcp_copied
,
1276 transport
->tcp_offset
, transport
->tcp_reclen
);
1278 if (transport
->tcp_copied
== req
->rq_private_buf
.buflen
)
1279 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1280 else if (transport
->tcp_offset
== transport
->tcp_reclen
) {
1281 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
)
1282 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1287 * Finds the request corresponding to the RPC xid and invokes the common
1288 * tcp read code to read the data.
1290 static inline int xs_tcp_read_reply(struct rpc_xprt
*xprt
,
1291 struct xdr_skb_reader
*desc
)
1293 struct sock_xprt
*transport
=
1294 container_of(xprt
, struct sock_xprt
, xprt
);
1295 struct rpc_rqst
*req
;
1297 dprintk("RPC: read reply XID %08x\n", ntohl(transport
->tcp_xid
));
1299 /* Find and lock the request corresponding to this xid */
1300 spin_lock(&xprt
->transport_lock
);
1301 req
= xprt_lookup_rqst(xprt
, transport
->tcp_xid
);
1303 dprintk("RPC: XID %08x request not found!\n",
1304 ntohl(transport
->tcp_xid
));
1305 spin_unlock(&xprt
->transport_lock
);
1309 xs_tcp_read_common(xprt
, desc
, req
);
1311 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
))
1312 xprt_complete_rqst(req
->rq_task
, transport
->tcp_copied
);
1314 spin_unlock(&xprt
->transport_lock
);
1318 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1320 * Obtains an rpc_rqst previously allocated and invokes the common
1321 * tcp read code to read the data. The result is placed in the callback
1323 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1324 * connection and return -1.
1326 static int xs_tcp_read_callback(struct rpc_xprt
*xprt
,
1327 struct xdr_skb_reader
*desc
)
1329 struct sock_xprt
*transport
=
1330 container_of(xprt
, struct sock_xprt
, xprt
);
1331 struct rpc_rqst
*req
;
1333 /* Look up and lock the request corresponding to the given XID */
1334 spin_lock(&xprt
->transport_lock
);
1335 req
= xprt_lookup_bc_request(xprt
, transport
->tcp_xid
);
1337 spin_unlock(&xprt
->transport_lock
);
1338 printk(KERN_WARNING
"Callback slot table overflowed\n");
1339 xprt_force_disconnect(xprt
);
1343 dprintk("RPC: read callback XID %08x\n", ntohl(req
->rq_xid
));
1344 xs_tcp_read_common(xprt
, desc
, req
);
1346 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
))
1347 xprt_complete_bc_request(req
, transport
->tcp_copied
);
1348 spin_unlock(&xprt
->transport_lock
);
1353 static inline int _xs_tcp_read_data(struct rpc_xprt
*xprt
,
1354 struct xdr_skb_reader
*desc
)
1356 struct sock_xprt
*transport
=
1357 container_of(xprt
, struct sock_xprt
, xprt
);
1359 return (transport
->tcp_flags
& TCP_RPC_REPLY
) ?
1360 xs_tcp_read_reply(xprt
, desc
) :
1361 xs_tcp_read_callback(xprt
, desc
);
1364 static inline int _xs_tcp_read_data(struct rpc_xprt
*xprt
,
1365 struct xdr_skb_reader
*desc
)
1367 return xs_tcp_read_reply(xprt
, desc
);
1369 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1372 * Read data off the transport. This can be either an RPC_CALL or an
1373 * RPC_REPLY. Relay the processing to helper functions.
1375 static void xs_tcp_read_data(struct rpc_xprt
*xprt
,
1376 struct xdr_skb_reader
*desc
)
1378 struct sock_xprt
*transport
=
1379 container_of(xprt
, struct sock_xprt
, xprt
);
1381 if (_xs_tcp_read_data(xprt
, desc
) == 0)
1382 xs_tcp_check_fraghdr(transport
);
1385 * The transport_lock protects the request handling.
1386 * There's no need to hold it to update the tcp_flags.
1388 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1392 static inline void xs_tcp_read_discard(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
1396 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
1397 if (len
> desc
->count
)
1400 desc
->offset
+= len
;
1401 transport
->tcp_offset
+= len
;
1402 dprintk("RPC: discarded %Zu bytes\n", len
);
1403 xs_tcp_check_fraghdr(transport
);
1406 static int xs_tcp_data_recv(read_descriptor_t
*rd_desc
, struct sk_buff
*skb
, unsigned int offset
, size_t len
)
1408 struct rpc_xprt
*xprt
= rd_desc
->arg
.data
;
1409 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1410 struct xdr_skb_reader desc
= {
1416 dprintk("RPC: xs_tcp_data_recv started\n");
1418 /* Read in a new fragment marker if necessary */
1419 /* Can we ever really expect to get completely empty fragments? */
1420 if (transport
->tcp_flags
& TCP_RCV_COPY_FRAGHDR
) {
1421 xs_tcp_read_fraghdr(xprt
, &desc
);
1424 /* Read in the xid if necessary */
1425 if (transport
->tcp_flags
& TCP_RCV_COPY_XID
) {
1426 xs_tcp_read_xid(transport
, &desc
);
1429 /* Read in the call/reply flag */
1430 if (transport
->tcp_flags
& TCP_RCV_READ_CALLDIR
) {
1431 xs_tcp_read_calldir(transport
, &desc
);
1434 /* Read in the request data */
1435 if (transport
->tcp_flags
& TCP_RCV_COPY_DATA
) {
1436 xs_tcp_read_data(xprt
, &desc
);
1439 /* Skip over any trailing bytes on short reads */
1440 xs_tcp_read_discard(transport
, &desc
);
1441 } while (desc
.count
);
1442 dprintk("RPC: xs_tcp_data_recv done\n");
1443 return len
- desc
.count
;
1447 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1448 * @sk: socket with data to read
1449 * @bytes: how much data to read
1452 static void xs_tcp_data_ready(struct sock
*sk
)
1454 struct rpc_xprt
*xprt
;
1455 read_descriptor_t rd_desc
;
1458 dprintk("RPC: xs_tcp_data_ready...\n");
1460 read_lock_bh(&sk
->sk_callback_lock
);
1461 if (!(xprt
= xprt_from_sock(sk
)))
1463 /* Any data means we had a useful conversation, so
1464 * the we don't need to delay the next reconnect
1466 if (xprt
->reestablish_timeout
)
1467 xprt
->reestablish_timeout
= 0;
1469 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1470 rd_desc
.arg
.data
= xprt
;
1472 rd_desc
.count
= 65536;
1473 read
= tcp_read_sock(sk
, &rd_desc
, xs_tcp_data_recv
);
1476 read_unlock_bh(&sk
->sk_callback_lock
);
1480 * Do the equivalent of linger/linger2 handling for dealing with
1481 * broken servers that don't close the socket in a timely
1484 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt
*xprt
,
1485 unsigned long timeout
)
1487 struct sock_xprt
*transport
;
1489 if (xprt_test_and_set_connecting(xprt
))
1491 set_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1492 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1493 queue_delayed_work(rpciod_workqueue
, &transport
->connect_worker
,
1497 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt
*xprt
)
1499 struct sock_xprt
*transport
;
1501 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1503 if (!test_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
) ||
1504 !cancel_delayed_work(&transport
->connect_worker
))
1506 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1507 xprt_clear_connecting(xprt
);
1510 static void xs_sock_reset_connection_flags(struct rpc_xprt
*xprt
)
1512 smp_mb__before_atomic();
1513 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1514 clear_bit(XPRT_CONNECTION_CLOSE
, &xprt
->state
);
1515 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
1516 clear_bit(XPRT_CLOSING
, &xprt
->state
);
1517 smp_mb__after_atomic();
1520 static void xs_sock_mark_closed(struct rpc_xprt
*xprt
)
1522 xs_sock_reset_connection_flags(xprt
);
1523 /* Mark transport as closed and wake up all pending tasks */
1524 xprt_disconnect_done(xprt
);
1528 * xs_tcp_state_change - callback to handle TCP socket state changes
1529 * @sk: socket whose state has changed
1532 static void xs_tcp_state_change(struct sock
*sk
)
1534 struct rpc_xprt
*xprt
;
1536 read_lock_bh(&sk
->sk_callback_lock
);
1537 if (!(xprt
= xprt_from_sock(sk
)))
1539 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt
);
1540 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1541 sk
->sk_state
, xprt_connected(xprt
),
1542 sock_flag(sk
, SOCK_DEAD
),
1543 sock_flag(sk
, SOCK_ZAPPED
),
1546 trace_rpc_socket_state_change(xprt
, sk
->sk_socket
);
1547 switch (sk
->sk_state
) {
1548 case TCP_ESTABLISHED
:
1549 spin_lock(&xprt
->transport_lock
);
1550 if (!xprt_test_and_set_connected(xprt
)) {
1551 struct sock_xprt
*transport
= container_of(xprt
,
1552 struct sock_xprt
, xprt
);
1554 /* Reset TCP record info */
1555 transport
->tcp_offset
= 0;
1556 transport
->tcp_reclen
= 0;
1557 transport
->tcp_copied
= 0;
1558 transport
->tcp_flags
=
1559 TCP_RCV_COPY_FRAGHDR
| TCP_RCV_COPY_XID
;
1560 xprt
->connect_cookie
++;
1562 xprt_wake_pending_tasks(xprt
, -EAGAIN
);
1564 spin_unlock(&xprt
->transport_lock
);
1567 /* The client initiated a shutdown of the socket */
1568 xprt
->connect_cookie
++;
1569 xprt
->reestablish_timeout
= 0;
1570 set_bit(XPRT_CLOSING
, &xprt
->state
);
1571 smp_mb__before_atomic();
1572 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1573 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
1574 smp_mb__after_atomic();
1575 xs_tcp_schedule_linger_timeout(xprt
, xs_tcp_fin_timeout
);
1577 case TCP_CLOSE_WAIT
:
1578 /* The server initiated a shutdown of the socket */
1579 xprt
->connect_cookie
++;
1580 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1581 xs_tcp_force_close(xprt
);
1584 * If the server closed down the connection, make sure that
1585 * we back off before reconnecting
1587 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
1588 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
1591 set_bit(XPRT_CLOSING
, &xprt
->state
);
1592 xs_tcp_schedule_linger_timeout(xprt
, xs_tcp_fin_timeout
);
1593 smp_mb__before_atomic();
1594 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1595 smp_mb__after_atomic();
1598 xs_tcp_cancel_linger_timeout(xprt
);
1599 xs_sock_mark_closed(xprt
);
1602 read_unlock_bh(&sk
->sk_callback_lock
);
1605 static void xs_write_space(struct sock
*sk
)
1607 struct socket
*sock
;
1608 struct rpc_xprt
*xprt
;
1610 if (unlikely(!(sock
= sk
->sk_socket
)))
1612 clear_bit(SOCK_NOSPACE
, &sock
->flags
);
1614 if (unlikely(!(xprt
= xprt_from_sock(sk
))))
1616 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE
, &sock
->flags
) == 0)
1619 xprt_write_space(xprt
);
1623 * xs_udp_write_space - callback invoked when socket buffer space
1625 * @sk: socket whose state has changed
1627 * Called when more output buffer space is available for this socket.
1628 * We try not to wake our writers until they can make "significant"
1629 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1630 * with a bunch of small requests.
1632 static void xs_udp_write_space(struct sock
*sk
)
1634 read_lock_bh(&sk
->sk_callback_lock
);
1636 /* from net/core/sock.c:sock_def_write_space */
1637 if (sock_writeable(sk
))
1640 read_unlock_bh(&sk
->sk_callback_lock
);
1644 * xs_tcp_write_space - callback invoked when socket buffer space
1646 * @sk: socket whose state has changed
1648 * Called when more output buffer space is available for this socket.
1649 * We try not to wake our writers until they can make "significant"
1650 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1651 * with a bunch of small requests.
1653 static void xs_tcp_write_space(struct sock
*sk
)
1655 read_lock_bh(&sk
->sk_callback_lock
);
1657 /* from net/core/stream.c:sk_stream_write_space */
1658 if (sk_stream_is_writeable(sk
))
1661 read_unlock_bh(&sk
->sk_callback_lock
);
1664 static void xs_udp_do_set_buffer_size(struct rpc_xprt
*xprt
)
1666 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1667 struct sock
*sk
= transport
->inet
;
1669 if (transport
->rcvsize
) {
1670 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
1671 sk
->sk_rcvbuf
= transport
->rcvsize
* xprt
->max_reqs
* 2;
1673 if (transport
->sndsize
) {
1674 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
1675 sk
->sk_sndbuf
= transport
->sndsize
* xprt
->max_reqs
* 2;
1676 sk
->sk_write_space(sk
);
1681 * xs_udp_set_buffer_size - set send and receive limits
1682 * @xprt: generic transport
1683 * @sndsize: requested size of send buffer, in bytes
1684 * @rcvsize: requested size of receive buffer, in bytes
1686 * Set socket send and receive buffer size limits.
1688 static void xs_udp_set_buffer_size(struct rpc_xprt
*xprt
, size_t sndsize
, size_t rcvsize
)
1690 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1692 transport
->sndsize
= 0;
1694 transport
->sndsize
= sndsize
+ 1024;
1695 transport
->rcvsize
= 0;
1697 transport
->rcvsize
= rcvsize
+ 1024;
1699 xs_udp_do_set_buffer_size(xprt
);
1703 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1704 * @task: task that timed out
1706 * Adjust the congestion window after a retransmit timeout has occurred.
1708 static void xs_udp_timer(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
1710 xprt_adjust_cwnd(xprt
, task
, -ETIMEDOUT
);
1713 static unsigned short xs_get_random_port(void)
1715 unsigned short range
= xprt_max_resvport
- xprt_min_resvport
;
1716 unsigned short rand
= (unsigned short) prandom_u32() % range
;
1717 return rand
+ xprt_min_resvport
;
1721 * xs_set_port - reset the port number in the remote endpoint address
1722 * @xprt: generic transport
1723 * @port: new port number
1726 static void xs_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1728 dprintk("RPC: setting port for xprt %p to %u\n", xprt
, port
);
1730 rpc_set_port(xs_addr(xprt
), port
);
1731 xs_update_peer_port(xprt
);
1734 static unsigned short xs_get_srcport(struct sock_xprt
*transport
)
1736 unsigned short port
= transport
->srcport
;
1738 if (port
== 0 && transport
->xprt
.resvport
)
1739 port
= xs_get_random_port();
1743 static unsigned short xs_next_srcport(struct sock_xprt
*transport
, unsigned short port
)
1745 if (transport
->srcport
!= 0)
1746 transport
->srcport
= 0;
1747 if (!transport
->xprt
.resvport
)
1749 if (port
<= xprt_min_resvport
|| port
> xprt_max_resvport
)
1750 return xprt_max_resvport
;
1753 static int xs_bind(struct sock_xprt
*transport
, struct socket
*sock
)
1755 struct sockaddr_storage myaddr
;
1757 unsigned short port
= xs_get_srcport(transport
);
1758 unsigned short last
;
1761 * If we are asking for any ephemeral port (i.e. port == 0 &&
1762 * transport->xprt.resvport == 0), don't bind. Let the local
1763 * port selection happen implicitly when the socket is used
1764 * (for example at connect time).
1766 * This ensures that we can continue to establish TCP
1767 * connections even when all local ephemeral ports are already
1768 * a part of some TCP connection. This makes no difference
1769 * for UDP sockets, but also doens't harm them.
1771 * If we're asking for any reserved port (i.e. port == 0 &&
1772 * transport->xprt.resvport == 1) xs_get_srcport above will
1773 * ensure that port is non-zero and we will bind as needed.
1778 memcpy(&myaddr
, &transport
->srcaddr
, transport
->xprt
.addrlen
);
1780 rpc_set_port((struct sockaddr
*)&myaddr
, port
);
1781 err
= kernel_bind(sock
, (struct sockaddr
*)&myaddr
,
1782 transport
->xprt
.addrlen
);
1784 transport
->srcport
= port
;
1788 port
= xs_next_srcport(transport
, port
);
1791 } while (err
== -EADDRINUSE
&& nloop
!= 2);
1793 if (myaddr
.ss_family
== AF_INET
)
1794 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__
,
1795 &((struct sockaddr_in
*)&myaddr
)->sin_addr
,
1796 port
, err
? "failed" : "ok", err
);
1798 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__
,
1799 &((struct sockaddr_in6
*)&myaddr
)->sin6_addr
,
1800 port
, err
? "failed" : "ok", err
);
1805 * We don't support autobind on AF_LOCAL sockets
1807 static void xs_local_rpcbind(struct rpc_task
*task
)
1810 xprt_set_bound(rcu_dereference(task
->tk_client
->cl_xprt
));
1814 static void xs_local_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1818 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1819 static struct lock_class_key xs_key
[2];
1820 static struct lock_class_key xs_slock_key
[2];
1822 static inline void xs_reclassify_socketu(struct socket
*sock
)
1824 struct sock
*sk
= sock
->sk
;
1826 sock_lock_init_class_and_name(sk
, "slock-AF_LOCAL-RPC",
1827 &xs_slock_key
[1], "sk_lock-AF_LOCAL-RPC", &xs_key
[1]);
1830 static inline void xs_reclassify_socket4(struct socket
*sock
)
1832 struct sock
*sk
= sock
->sk
;
1834 sock_lock_init_class_and_name(sk
, "slock-AF_INET-RPC",
1835 &xs_slock_key
[0], "sk_lock-AF_INET-RPC", &xs_key
[0]);
1838 static inline void xs_reclassify_socket6(struct socket
*sock
)
1840 struct sock
*sk
= sock
->sk
;
1842 sock_lock_init_class_and_name(sk
, "slock-AF_INET6-RPC",
1843 &xs_slock_key
[1], "sk_lock-AF_INET6-RPC", &xs_key
[1]);
1846 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1848 WARN_ON_ONCE(sock_owned_by_user(sock
->sk
));
1849 if (sock_owned_by_user(sock
->sk
))
1854 xs_reclassify_socketu(sock
);
1857 xs_reclassify_socket4(sock
);
1860 xs_reclassify_socket6(sock
);
1865 static inline void xs_reclassify_socketu(struct socket
*sock
)
1869 static inline void xs_reclassify_socket4(struct socket
*sock
)
1873 static inline void xs_reclassify_socket6(struct socket
*sock
)
1877 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1882 static void xs_dummy_setup_socket(struct work_struct
*work
)
1886 static struct socket
*xs_create_sock(struct rpc_xprt
*xprt
,
1887 struct sock_xprt
*transport
, int family
, int type
, int protocol
)
1889 struct socket
*sock
;
1892 err
= __sock_create(xprt
->xprt_net
, family
, type
, protocol
, &sock
, 1);
1894 dprintk("RPC: can't create %d transport socket (%d).\n",
1898 xs_reclassify_socket(family
, sock
);
1900 err
= xs_bind(transport
, sock
);
1908 return ERR_PTR(err
);
1911 static int xs_local_finish_connecting(struct rpc_xprt
*xprt
,
1912 struct socket
*sock
)
1914 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
1917 if (!transport
->inet
) {
1918 struct sock
*sk
= sock
->sk
;
1920 write_lock_bh(&sk
->sk_callback_lock
);
1922 xs_save_old_callbacks(transport
, sk
);
1924 sk
->sk_user_data
= xprt
;
1925 sk
->sk_data_ready
= xs_local_data_ready
;
1926 sk
->sk_write_space
= xs_udp_write_space
;
1927 sk
->sk_error_report
= xs_error_report
;
1928 sk
->sk_allocation
= GFP_ATOMIC
;
1930 xprt_clear_connected(xprt
);
1932 /* Reset to new socket */
1933 transport
->sock
= sock
;
1934 transport
->inet
= sk
;
1936 write_unlock_bh(&sk
->sk_callback_lock
);
1939 /* Tell the socket layer to start connecting... */
1940 xprt
->stat
.connect_count
++;
1941 xprt
->stat
.connect_start
= jiffies
;
1942 return kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, 0);
1946 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1947 * @xprt: RPC transport to connect
1948 * @transport: socket transport to connect
1949 * @create_sock: function to create a socket of the correct type
1951 static int xs_local_setup_socket(struct sock_xprt
*transport
)
1953 struct rpc_xprt
*xprt
= &transport
->xprt
;
1954 struct socket
*sock
;
1957 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1958 status
= __sock_create(xprt
->xprt_net
, AF_LOCAL
,
1959 SOCK_STREAM
, 0, &sock
, 1);
1961 dprintk("RPC: can't create AF_LOCAL "
1962 "transport socket (%d).\n", -status
);
1965 xs_reclassify_socketu(sock
);
1967 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1968 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1970 status
= xs_local_finish_connecting(xprt
, sock
);
1971 trace_rpc_socket_connect(xprt
, sock
, status
);
1974 dprintk("RPC: xprt %p connected to %s\n",
1975 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1976 xprt_set_connected(xprt
);
1980 dprintk("RPC: xprt %p: socket %s does not exist\n",
1981 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1984 dprintk("RPC: xprt %p: connection refused for %s\n",
1985 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1988 printk(KERN_ERR
"%s: unhandled error (%d) connecting to %s\n",
1990 xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1994 xprt_clear_connecting(xprt
);
1995 xprt_wake_pending_tasks(xprt
, status
);
1999 static void xs_local_connect(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
2001 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2004 if (RPC_IS_ASYNC(task
)) {
2006 * We want the AF_LOCAL connect to be resolved in the
2007 * filesystem namespace of the process making the rpc
2008 * call. Thus we connect synchronously.
2010 * If we want to support asynchronous AF_LOCAL calls,
2011 * we'll need to figure out how to pass a namespace to
2014 rpc_exit(task
, -ENOTCONN
);
2017 ret
= xs_local_setup_socket(transport
);
2018 if (ret
&& !RPC_IS_SOFTCONN(task
))
2019 msleep_interruptible(15000);
2022 #ifdef CONFIG_SUNRPC_SWAP
2023 static void xs_set_memalloc(struct rpc_xprt
*xprt
)
2025 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
2029 sk_set_memalloc(transport
->inet
);
2033 * xs_swapper - Tag this transport as being used for swap.
2034 * @xprt: transport to tag
2035 * @enable: enable/disable
2038 int xs_swapper(struct rpc_xprt
*xprt
, int enable
)
2040 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
2046 xs_set_memalloc(xprt
);
2047 } else if (xprt
->swapper
) {
2049 sk_clear_memalloc(transport
->inet
);
2054 EXPORT_SYMBOL_GPL(xs_swapper
);
2056 static void xs_set_memalloc(struct rpc_xprt
*xprt
)
2061 static void xs_udp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
2063 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2065 if (!transport
->inet
) {
2066 struct sock
*sk
= sock
->sk
;
2068 write_lock_bh(&sk
->sk_callback_lock
);
2070 xs_save_old_callbacks(transport
, sk
);
2072 sk
->sk_user_data
= xprt
;
2073 sk
->sk_data_ready
= xs_udp_data_ready
;
2074 sk
->sk_write_space
= xs_udp_write_space
;
2075 sk
->sk_allocation
= GFP_ATOMIC
;
2077 xprt_set_connected(xprt
);
2079 /* Reset to new socket */
2080 transport
->sock
= sock
;
2081 transport
->inet
= sk
;
2083 xs_set_memalloc(xprt
);
2085 write_unlock_bh(&sk
->sk_callback_lock
);
2087 xs_udp_do_set_buffer_size(xprt
);
2090 static void xs_udp_setup_socket(struct work_struct
*work
)
2092 struct sock_xprt
*transport
=
2093 container_of(work
, struct sock_xprt
, connect_worker
.work
);
2094 struct rpc_xprt
*xprt
= &transport
->xprt
;
2095 struct socket
*sock
= transport
->sock
;
2098 /* Start by resetting any existing state */
2099 xs_reset_transport(transport
);
2100 sock
= xs_create_sock(xprt
, transport
,
2101 xs_addr(xprt
)->sa_family
, SOCK_DGRAM
, IPPROTO_UDP
);
2105 dprintk("RPC: worker connecting xprt %p via %s to "
2106 "%s (port %s)\n", xprt
,
2107 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
2108 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2109 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
2111 xs_udp_finish_connecting(xprt
, sock
);
2112 trace_rpc_socket_connect(xprt
, sock
, 0);
2115 xprt_clear_connecting(xprt
);
2116 xprt_wake_pending_tasks(xprt
, status
);
2120 * We need to preserve the port number so the reply cache on the server can
2121 * find our cached RPC replies when we get around to reconnecting.
2123 static void xs_abort_connection(struct sock_xprt
*transport
)
2126 struct sockaddr any
;
2128 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport
);
2131 * Disconnect the transport socket by doing a connect operation
2132 * with AF_UNSPEC. This should return immediately...
2134 memset(&any
, 0, sizeof(any
));
2135 any
.sa_family
= AF_UNSPEC
;
2136 result
= kernel_connect(transport
->sock
, &any
, sizeof(any
), 0);
2137 trace_rpc_socket_reset_connection(&transport
->xprt
,
2138 transport
->sock
, result
);
2140 xs_sock_reset_connection_flags(&transport
->xprt
);
2141 dprintk("RPC: AF_UNSPEC connect return code %d\n", result
);
2144 static void xs_tcp_reuse_connection(struct sock_xprt
*transport
)
2146 unsigned int state
= transport
->inet
->sk_state
;
2148 if (state
== TCP_CLOSE
&& transport
->sock
->state
== SS_UNCONNECTED
) {
2149 /* we don't need to abort the connection if the socket
2150 * hasn't undergone a shutdown
2152 if (transport
->inet
->sk_shutdown
== 0)
2154 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2155 __func__
, transport
->inet
->sk_shutdown
);
2157 if ((1 << state
) & (TCPF_ESTABLISHED
|TCPF_SYN_SENT
)) {
2158 /* we don't need to abort the connection if the socket
2159 * hasn't undergone a shutdown
2161 if (transport
->inet
->sk_shutdown
== 0)
2163 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2164 "sk_shutdown set to %d\n",
2165 __func__
, transport
->inet
->sk_shutdown
);
2167 xs_abort_connection(transport
);
2170 static int xs_tcp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
2172 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2173 int ret
= -ENOTCONN
;
2175 if (!transport
->inet
) {
2176 struct sock
*sk
= sock
->sk
;
2177 unsigned int keepidle
= xprt
->timeout
->to_initval
/ HZ
;
2178 unsigned int keepcnt
= xprt
->timeout
->to_retries
+ 1;
2179 unsigned int opt_on
= 1;
2181 /* TCP Keepalive options */
2182 kernel_setsockopt(sock
, SOL_SOCKET
, SO_KEEPALIVE
,
2183 (char *)&opt_on
, sizeof(opt_on
));
2184 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPIDLE
,
2185 (char *)&keepidle
, sizeof(keepidle
));
2186 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPINTVL
,
2187 (char *)&keepidle
, sizeof(keepidle
));
2188 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPCNT
,
2189 (char *)&keepcnt
, sizeof(keepcnt
));
2191 write_lock_bh(&sk
->sk_callback_lock
);
2193 xs_save_old_callbacks(transport
, sk
);
2195 sk
->sk_user_data
= xprt
;
2196 sk
->sk_data_ready
= xs_tcp_data_ready
;
2197 sk
->sk_state_change
= xs_tcp_state_change
;
2198 sk
->sk_write_space
= xs_tcp_write_space
;
2199 sk
->sk_error_report
= xs_error_report
;
2200 sk
->sk_allocation
= GFP_ATOMIC
;
2202 /* socket options */
2203 sk
->sk_userlocks
|= SOCK_BINDPORT_LOCK
;
2204 sock_reset_flag(sk
, SOCK_LINGER
);
2205 tcp_sk(sk
)->linger2
= 0;
2206 tcp_sk(sk
)->nonagle
|= TCP_NAGLE_OFF
;
2208 xprt_clear_connected(xprt
);
2210 /* Reset to new socket */
2211 transport
->sock
= sock
;
2212 transport
->inet
= sk
;
2214 write_unlock_bh(&sk
->sk_callback_lock
);
2217 if (!xprt_bound(xprt
))
2220 xs_set_memalloc(xprt
);
2222 /* Tell the socket layer to start connecting... */
2223 xprt
->stat
.connect_count
++;
2224 xprt
->stat
.connect_start
= jiffies
;
2225 ret
= kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, O_NONBLOCK
);
2230 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
2231 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2238 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2239 * @xprt: RPC transport to connect
2240 * @transport: socket transport to connect
2241 * @create_sock: function to create a socket of the correct type
2243 * Invoked by a work queue tasklet.
2245 static void xs_tcp_setup_socket(struct work_struct
*work
)
2247 struct sock_xprt
*transport
=
2248 container_of(work
, struct sock_xprt
, connect_worker
.work
);
2249 struct socket
*sock
= transport
->sock
;
2250 struct rpc_xprt
*xprt
= &transport
->xprt
;
2254 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
2255 sock
= xs_create_sock(xprt
, transport
,
2256 xs_addr(xprt
)->sa_family
, SOCK_STREAM
, IPPROTO_TCP
);
2258 status
= PTR_ERR(sock
);
2264 abort_and_exit
= test_and_clear_bit(XPRT_CONNECTION_ABORT
,
2266 /* "close" the socket, preserving the local port */
2267 set_bit(XPRT_CONNECTION_REUSE
, &xprt
->state
);
2268 xs_tcp_reuse_connection(transport
);
2269 clear_bit(XPRT_CONNECTION_REUSE
, &xprt
->state
);
2275 dprintk("RPC: worker connecting xprt %p via %s to "
2276 "%s (port %s)\n", xprt
,
2277 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
2278 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2279 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
2281 status
= xs_tcp_finish_connecting(xprt
, sock
);
2282 trace_rpc_socket_connect(xprt
, sock
, status
);
2283 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2284 xprt
, -status
, xprt_connected(xprt
),
2285 sock
->sk
->sk_state
);
2288 printk("%s: connect returned unhandled error %d\n",
2290 case -EADDRNOTAVAIL
:
2291 /* We're probably in TIME_WAIT. Get rid of existing socket,
2294 xs_tcp_force_close(xprt
);
2299 xprt_clear_connecting(xprt
);
2302 /* Happens, for instance, if the user specified a link
2303 * local IPv6 address without a scope-id.
2309 /* retry with existing socket, after a delay */
2315 xprt_clear_connecting(xprt
);
2316 xprt_wake_pending_tasks(xprt
, status
);
2320 * xs_connect - connect a socket to a remote endpoint
2321 * @xprt: pointer to transport structure
2322 * @task: address of RPC task that manages state of connect request
2324 * TCP: If the remote end dropped the connection, delay reconnecting.
2326 * UDP socket connects are synchronous, but we use a work queue anyway
2327 * to guarantee that even unprivileged user processes can set up a
2328 * socket on a privileged port.
2330 * If a UDP socket connect fails, the delay behavior here prevents
2331 * retry floods (hard mounts).
2333 static void xs_connect(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
2335 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2337 if (transport
->sock
!= NULL
&& !RPC_IS_SOFTCONN(task
)) {
2338 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2340 xprt
, xprt
->reestablish_timeout
/ HZ
);
2341 queue_delayed_work(rpciod_workqueue
,
2342 &transport
->connect_worker
,
2343 xprt
->reestablish_timeout
);
2344 xprt
->reestablish_timeout
<<= 1;
2345 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
2346 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2347 if (xprt
->reestablish_timeout
> XS_TCP_MAX_REEST_TO
)
2348 xprt
->reestablish_timeout
= XS_TCP_MAX_REEST_TO
;
2350 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt
);
2351 queue_delayed_work(rpciod_workqueue
,
2352 &transport
->connect_worker
, 0);
2357 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2358 * @xprt: rpc_xprt struct containing statistics
2362 static void xs_local_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2366 if (xprt_connected(xprt
))
2367 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
2369 seq_printf(seq
, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2370 "%llu %llu %lu %llu %llu\n",
2371 xprt
->stat
.bind_count
,
2372 xprt
->stat
.connect_count
,
2373 xprt
->stat
.connect_time
,
2377 xprt
->stat
.bad_xids
,
2380 xprt
->stat
.max_slots
,
2381 xprt
->stat
.sending_u
,
2382 xprt
->stat
.pending_u
);
2386 * xs_udp_print_stats - display UDP socket-specifc stats
2387 * @xprt: rpc_xprt struct containing statistics
2391 static void xs_udp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2393 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2395 seq_printf(seq
, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2398 xprt
->stat
.bind_count
,
2401 xprt
->stat
.bad_xids
,
2404 xprt
->stat
.max_slots
,
2405 xprt
->stat
.sending_u
,
2406 xprt
->stat
.pending_u
);
2410 * xs_tcp_print_stats - display TCP socket-specifc stats
2411 * @xprt: rpc_xprt struct containing statistics
2415 static void xs_tcp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2417 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2420 if (xprt_connected(xprt
))
2421 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
2423 seq_printf(seq
, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2424 "%llu %llu %lu %llu %llu\n",
2426 xprt
->stat
.bind_count
,
2427 xprt
->stat
.connect_count
,
2428 xprt
->stat
.connect_time
,
2432 xprt
->stat
.bad_xids
,
2435 xprt
->stat
.max_slots
,
2436 xprt
->stat
.sending_u
,
2437 xprt
->stat
.pending_u
);
2441 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2442 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2443 * to use the server side send routines.
2445 static void *bc_malloc(struct rpc_task
*task
, size_t size
)
2448 struct rpc_buffer
*buf
;
2450 WARN_ON_ONCE(size
> PAGE_SIZE
- sizeof(struct rpc_buffer
));
2451 if (size
> PAGE_SIZE
- sizeof(struct rpc_buffer
))
2454 page
= alloc_page(GFP_KERNEL
);
2458 buf
= page_address(page
);
2459 buf
->len
= PAGE_SIZE
;
2465 * Free the space allocated in the bc_alloc routine
2467 static void bc_free(void *buffer
)
2469 struct rpc_buffer
*buf
;
2474 buf
= container_of(buffer
, struct rpc_buffer
, data
);
2475 free_page((unsigned long)buf
);
2479 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2480 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2482 static int bc_sendto(struct rpc_rqst
*req
)
2485 struct xdr_buf
*xbufp
= &req
->rq_snd_buf
;
2486 struct rpc_xprt
*xprt
= req
->rq_xprt
;
2487 struct sock_xprt
*transport
=
2488 container_of(xprt
, struct sock_xprt
, xprt
);
2489 struct socket
*sock
= transport
->sock
;
2490 unsigned long headoff
;
2491 unsigned long tailoff
;
2493 xs_encode_stream_record_marker(xbufp
);
2495 tailoff
= (unsigned long)xbufp
->tail
[0].iov_base
& ~PAGE_MASK
;
2496 headoff
= (unsigned long)xbufp
->head
[0].iov_base
& ~PAGE_MASK
;
2497 len
= svc_send_common(sock
, xbufp
,
2498 virt_to_page(xbufp
->head
[0].iov_base
), headoff
,
2499 xbufp
->tail
[0].iov_base
, tailoff
);
2501 if (len
!= xbufp
->len
) {
2502 printk(KERN_NOTICE
"Error sending entire callback!\n");
2510 * The send routine. Borrows from svc_send
2512 static int bc_send_request(struct rpc_task
*task
)
2514 struct rpc_rqst
*req
= task
->tk_rqstp
;
2515 struct svc_xprt
*xprt
;
2518 dprintk("sending request with xid: %08x\n", ntohl(req
->rq_xid
));
2520 * Get the server socket associated with this callback xprt
2522 xprt
= req
->rq_xprt
->bc_xprt
;
2525 * Grab the mutex to serialize data as the connection is shared
2526 * with the fore channel
2528 if (!mutex_trylock(&xprt
->xpt_mutex
)) {
2529 rpc_sleep_on(&xprt
->xpt_bc_pending
, task
, NULL
);
2530 if (!mutex_trylock(&xprt
->xpt_mutex
))
2532 rpc_wake_up_queued_task(&xprt
->xpt_bc_pending
, task
);
2534 if (test_bit(XPT_DEAD
, &xprt
->xpt_flags
))
2537 len
= bc_sendto(req
);
2538 mutex_unlock(&xprt
->xpt_mutex
);
2547 * The close routine. Since this is client initiated, we do nothing
2550 static void bc_close(struct rpc_xprt
*xprt
)
2555 * The xprt destroy routine. Again, because this connection is client
2556 * initiated, we do nothing
2559 static void bc_destroy(struct rpc_xprt
*xprt
)
2561 dprintk("RPC: bc_destroy xprt %p\n", xprt
);
2564 module_put(THIS_MODULE
);
2567 static struct rpc_xprt_ops xs_local_ops
= {
2568 .reserve_xprt
= xprt_reserve_xprt
,
2569 .release_xprt
= xs_tcp_release_xprt
,
2570 .alloc_slot
= xprt_alloc_slot
,
2571 .rpcbind
= xs_local_rpcbind
,
2572 .set_port
= xs_local_set_port
,
2573 .connect
= xs_local_connect
,
2574 .buf_alloc
= rpc_malloc
,
2575 .buf_free
= rpc_free
,
2576 .send_request
= xs_local_send_request
,
2577 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2579 .destroy
= xs_destroy
,
2580 .print_stats
= xs_local_print_stats
,
2583 static struct rpc_xprt_ops xs_udp_ops
= {
2584 .set_buffer_size
= xs_udp_set_buffer_size
,
2585 .reserve_xprt
= xprt_reserve_xprt_cong
,
2586 .release_xprt
= xprt_release_xprt_cong
,
2587 .alloc_slot
= xprt_alloc_slot
,
2588 .rpcbind
= rpcb_getport_async
,
2589 .set_port
= xs_set_port
,
2590 .connect
= xs_connect
,
2591 .buf_alloc
= rpc_malloc
,
2592 .buf_free
= rpc_free
,
2593 .send_request
= xs_udp_send_request
,
2594 .set_retrans_timeout
= xprt_set_retrans_timeout_rtt
,
2595 .timer
= xs_udp_timer
,
2596 .release_request
= xprt_release_rqst_cong
,
2598 .destroy
= xs_destroy
,
2599 .print_stats
= xs_udp_print_stats
,
2602 static struct rpc_xprt_ops xs_tcp_ops
= {
2603 .reserve_xprt
= xprt_reserve_xprt
,
2604 .release_xprt
= xs_tcp_release_xprt
,
2605 .alloc_slot
= xprt_lock_and_alloc_slot
,
2606 .rpcbind
= rpcb_getport_async
,
2607 .set_port
= xs_set_port
,
2608 .connect
= xs_connect
,
2609 .buf_alloc
= rpc_malloc
,
2610 .buf_free
= rpc_free
,
2611 .send_request
= xs_tcp_send_request
,
2612 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2613 .close
= xs_tcp_close
,
2614 .destroy
= xs_destroy
,
2615 .print_stats
= xs_tcp_print_stats
,
2619 * The rpc_xprt_ops for the server backchannel
2622 static struct rpc_xprt_ops bc_tcp_ops
= {
2623 .reserve_xprt
= xprt_reserve_xprt
,
2624 .release_xprt
= xprt_release_xprt
,
2625 .alloc_slot
= xprt_alloc_slot
,
2626 .buf_alloc
= bc_malloc
,
2627 .buf_free
= bc_free
,
2628 .send_request
= bc_send_request
,
2629 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2631 .destroy
= bc_destroy
,
2632 .print_stats
= xs_tcp_print_stats
,
2635 static int xs_init_anyaddr(const int family
, struct sockaddr
*sap
)
2637 static const struct sockaddr_in sin
= {
2638 .sin_family
= AF_INET
,
2639 .sin_addr
.s_addr
= htonl(INADDR_ANY
),
2641 static const struct sockaddr_in6 sin6
= {
2642 .sin6_family
= AF_INET6
,
2643 .sin6_addr
= IN6ADDR_ANY_INIT
,
2650 memcpy(sap
, &sin
, sizeof(sin
));
2653 memcpy(sap
, &sin6
, sizeof(sin6
));
2656 dprintk("RPC: %s: Bad address family\n", __func__
);
2657 return -EAFNOSUPPORT
;
2662 static struct rpc_xprt
*xs_setup_xprt(struct xprt_create
*args
,
2663 unsigned int slot_table_size
,
2664 unsigned int max_slot_table_size
)
2666 struct rpc_xprt
*xprt
;
2667 struct sock_xprt
*new;
2669 if (args
->addrlen
> sizeof(xprt
->addr
)) {
2670 dprintk("RPC: xs_setup_xprt: address too large\n");
2671 return ERR_PTR(-EBADF
);
2674 xprt
= xprt_alloc(args
->net
, sizeof(*new), slot_table_size
,
2675 max_slot_table_size
);
2677 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2679 return ERR_PTR(-ENOMEM
);
2682 new = container_of(xprt
, struct sock_xprt
, xprt
);
2683 memcpy(&xprt
->addr
, args
->dstaddr
, args
->addrlen
);
2684 xprt
->addrlen
= args
->addrlen
;
2686 memcpy(&new->srcaddr
, args
->srcaddr
, args
->addrlen
);
2689 err
= xs_init_anyaddr(args
->dstaddr
->sa_family
,
2690 (struct sockaddr
*)&new->srcaddr
);
2693 return ERR_PTR(err
);
2700 static const struct rpc_timeout xs_local_default_timeout
= {
2701 .to_initval
= 10 * HZ
,
2702 .to_maxval
= 10 * HZ
,
2707 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2708 * @args: rpc transport creation arguments
2710 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2712 static struct rpc_xprt
*xs_setup_local(struct xprt_create
*args
)
2714 struct sockaddr_un
*sun
= (struct sockaddr_un
*)args
->dstaddr
;
2715 struct sock_xprt
*transport
;
2716 struct rpc_xprt
*xprt
;
2717 struct rpc_xprt
*ret
;
2719 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2720 xprt_max_tcp_slot_table_entries
);
2723 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2726 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2727 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2729 xprt
->bind_timeout
= XS_BIND_TO
;
2730 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2731 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2733 xprt
->ops
= &xs_local_ops
;
2734 xprt
->timeout
= &xs_local_default_timeout
;
2736 INIT_DELAYED_WORK(&transport
->connect_worker
,
2737 xs_dummy_setup_socket
);
2739 switch (sun
->sun_family
) {
2741 if (sun
->sun_path
[0] != '/') {
2742 dprintk("RPC: bad AF_LOCAL address: %s\n",
2744 ret
= ERR_PTR(-EINVAL
);
2747 xprt_set_bound(xprt
);
2748 xs_format_peer_addresses(xprt
, "local", RPCBIND_NETID_LOCAL
);
2749 ret
= ERR_PTR(xs_local_setup_socket(transport
));
2754 ret
= ERR_PTR(-EAFNOSUPPORT
);
2758 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2759 xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
2761 if (try_module_get(THIS_MODULE
))
2763 ret
= ERR_PTR(-EINVAL
);
2769 static const struct rpc_timeout xs_udp_default_timeout
= {
2770 .to_initval
= 5 * HZ
,
2771 .to_maxval
= 30 * HZ
,
2772 .to_increment
= 5 * HZ
,
2777 * xs_setup_udp - Set up transport to use a UDP socket
2778 * @args: rpc transport creation arguments
2781 static struct rpc_xprt
*xs_setup_udp(struct xprt_create
*args
)
2783 struct sockaddr
*addr
= args
->dstaddr
;
2784 struct rpc_xprt
*xprt
;
2785 struct sock_xprt
*transport
;
2786 struct rpc_xprt
*ret
;
2788 xprt
= xs_setup_xprt(args
, xprt_udp_slot_table_entries
,
2789 xprt_udp_slot_table_entries
);
2792 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2794 xprt
->prot
= IPPROTO_UDP
;
2796 /* XXX: header size can vary due to auth type, IPv6, etc. */
2797 xprt
->max_payload
= (1U << 16) - (MAX_HEADER
<< 3);
2799 xprt
->bind_timeout
= XS_BIND_TO
;
2800 xprt
->reestablish_timeout
= XS_UDP_REEST_TO
;
2801 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2803 xprt
->ops
= &xs_udp_ops
;
2805 xprt
->timeout
= &xs_udp_default_timeout
;
2807 switch (addr
->sa_family
) {
2809 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2810 xprt_set_bound(xprt
);
2812 INIT_DELAYED_WORK(&transport
->connect_worker
,
2813 xs_udp_setup_socket
);
2814 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP
);
2817 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2818 xprt_set_bound(xprt
);
2820 INIT_DELAYED_WORK(&transport
->connect_worker
,
2821 xs_udp_setup_socket
);
2822 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP6
);
2825 ret
= ERR_PTR(-EAFNOSUPPORT
);
2829 if (xprt_bound(xprt
))
2830 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2831 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2832 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2833 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2835 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2836 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2837 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2839 if (try_module_get(THIS_MODULE
))
2841 ret
= ERR_PTR(-EINVAL
);
2847 static const struct rpc_timeout xs_tcp_default_timeout
= {
2848 .to_initval
= 60 * HZ
,
2849 .to_maxval
= 60 * HZ
,
2854 * xs_setup_tcp - Set up transport to use a TCP socket
2855 * @args: rpc transport creation arguments
2858 static struct rpc_xprt
*xs_setup_tcp(struct xprt_create
*args
)
2860 struct sockaddr
*addr
= args
->dstaddr
;
2861 struct rpc_xprt
*xprt
;
2862 struct sock_xprt
*transport
;
2863 struct rpc_xprt
*ret
;
2864 unsigned int max_slot_table_size
= xprt_max_tcp_slot_table_entries
;
2866 if (args
->flags
& XPRT_CREATE_INFINITE_SLOTS
)
2867 max_slot_table_size
= RPC_MAX_SLOT_TABLE_LIMIT
;
2869 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2870 max_slot_table_size
);
2873 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2875 xprt
->prot
= IPPROTO_TCP
;
2876 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2877 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2879 xprt
->bind_timeout
= XS_BIND_TO
;
2880 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2881 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2883 xprt
->ops
= &xs_tcp_ops
;
2884 xprt
->timeout
= &xs_tcp_default_timeout
;
2886 switch (addr
->sa_family
) {
2888 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2889 xprt_set_bound(xprt
);
2891 INIT_DELAYED_WORK(&transport
->connect_worker
,
2892 xs_tcp_setup_socket
);
2893 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP
);
2896 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2897 xprt_set_bound(xprt
);
2899 INIT_DELAYED_WORK(&transport
->connect_worker
,
2900 xs_tcp_setup_socket
);
2901 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP6
);
2904 ret
= ERR_PTR(-EAFNOSUPPORT
);
2908 if (xprt_bound(xprt
))
2909 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2910 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2911 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2912 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2914 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2915 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2916 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2918 if (try_module_get(THIS_MODULE
))
2920 ret
= ERR_PTR(-EINVAL
);
2927 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2928 * @args: rpc transport creation arguments
2931 static struct rpc_xprt
*xs_setup_bc_tcp(struct xprt_create
*args
)
2933 struct sockaddr
*addr
= args
->dstaddr
;
2934 struct rpc_xprt
*xprt
;
2935 struct sock_xprt
*transport
;
2936 struct svc_sock
*bc_sock
;
2937 struct rpc_xprt
*ret
;
2939 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2940 xprt_tcp_slot_table_entries
);
2943 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2945 xprt
->prot
= IPPROTO_TCP
;
2946 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2947 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2948 xprt
->timeout
= &xs_tcp_default_timeout
;
2951 xprt_set_bound(xprt
);
2952 xprt
->bind_timeout
= 0;
2953 xprt
->reestablish_timeout
= 0;
2954 xprt
->idle_timeout
= 0;
2956 xprt
->ops
= &bc_tcp_ops
;
2958 switch (addr
->sa_family
) {
2960 xs_format_peer_addresses(xprt
, "tcp",
2964 xs_format_peer_addresses(xprt
, "tcp",
2965 RPCBIND_NETID_TCP6
);
2968 ret
= ERR_PTR(-EAFNOSUPPORT
);
2972 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2973 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2974 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2975 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2978 * Once we've associated a backchannel xprt with a connection,
2979 * we want to keep it around as long as the connection lasts,
2980 * in case we need to start using it for a backchannel again;
2981 * this reference won't be dropped until bc_xprt is destroyed.
2984 args
->bc_xprt
->xpt_bc_xprt
= xprt
;
2985 xprt
->bc_xprt
= args
->bc_xprt
;
2986 bc_sock
= container_of(args
->bc_xprt
, struct svc_sock
, sk_xprt
);
2987 transport
->sock
= bc_sock
->sk_sock
;
2988 transport
->inet
= bc_sock
->sk_sk
;
2991 * Since we don't want connections for the backchannel, we set
2992 * the xprt status to connected
2994 xprt_set_connected(xprt
);
2996 if (try_module_get(THIS_MODULE
))
2999 args
->bc_xprt
->xpt_bc_xprt
= NULL
;
3001 ret
= ERR_PTR(-EINVAL
);
3007 static struct xprt_class xs_local_transport
= {
3008 .list
= LIST_HEAD_INIT(xs_local_transport
.list
),
3009 .name
= "named UNIX socket",
3010 .owner
= THIS_MODULE
,
3011 .ident
= XPRT_TRANSPORT_LOCAL
,
3012 .setup
= xs_setup_local
,
3015 static struct xprt_class xs_udp_transport
= {
3016 .list
= LIST_HEAD_INIT(xs_udp_transport
.list
),
3018 .owner
= THIS_MODULE
,
3019 .ident
= XPRT_TRANSPORT_UDP
,
3020 .setup
= xs_setup_udp
,
3023 static struct xprt_class xs_tcp_transport
= {
3024 .list
= LIST_HEAD_INIT(xs_tcp_transport
.list
),
3026 .owner
= THIS_MODULE
,
3027 .ident
= XPRT_TRANSPORT_TCP
,
3028 .setup
= xs_setup_tcp
,
3031 static struct xprt_class xs_bc_tcp_transport
= {
3032 .list
= LIST_HEAD_INIT(xs_bc_tcp_transport
.list
),
3033 .name
= "tcp NFSv4.1 backchannel",
3034 .owner
= THIS_MODULE
,
3035 .ident
= XPRT_TRANSPORT_BC_TCP
,
3036 .setup
= xs_setup_bc_tcp
,
3040 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3043 int init_socket_xprt(void)
3046 if (!sunrpc_table_header
)
3047 sunrpc_table_header
= register_sysctl_table(sunrpc_table
);
3050 xprt_register_transport(&xs_local_transport
);
3051 xprt_register_transport(&xs_udp_transport
);
3052 xprt_register_transport(&xs_tcp_transport
);
3053 xprt_register_transport(&xs_bc_tcp_transport
);
3059 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3062 void cleanup_socket_xprt(void)
3065 if (sunrpc_table_header
) {
3066 unregister_sysctl_table(sunrpc_table_header
);
3067 sunrpc_table_header
= NULL
;
3071 xprt_unregister_transport(&xs_local_transport
);
3072 xprt_unregister_transport(&xs_udp_transport
);
3073 xprt_unregister_transport(&xs_tcp_transport
);
3074 xprt_unregister_transport(&xs_bc_tcp_transport
);
3077 static int param_set_uint_minmax(const char *val
,
3078 const struct kernel_param
*kp
,
3079 unsigned int min
, unsigned int max
)
3086 ret
= kstrtouint(val
, 0, &num
);
3087 if (ret
== -EINVAL
|| num
< min
|| num
> max
)
3089 *((unsigned int *)kp
->arg
) = num
;
3093 static int param_set_portnr(const char *val
, const struct kernel_param
*kp
)
3095 return param_set_uint_minmax(val
, kp
,
3100 static struct kernel_param_ops param_ops_portnr
= {
3101 .set
= param_set_portnr
,
3102 .get
= param_get_uint
,
3105 #define param_check_portnr(name, p) \
3106 __param_check(name, p, unsigned int);
3108 module_param_named(min_resvport
, xprt_min_resvport
, portnr
, 0644);
3109 module_param_named(max_resvport
, xprt_max_resvport
, portnr
, 0644);
3111 static int param_set_slot_table_size(const char *val
,
3112 const struct kernel_param
*kp
)
3114 return param_set_uint_minmax(val
, kp
,
3116 RPC_MAX_SLOT_TABLE
);
3119 static struct kernel_param_ops param_ops_slot_table_size
= {
3120 .set
= param_set_slot_table_size
,
3121 .get
= param_get_uint
,
3124 #define param_check_slot_table_size(name, p) \
3125 __param_check(name, p, unsigned int);
3127 static int param_set_max_slot_table_size(const char *val
,
3128 const struct kernel_param
*kp
)
3130 return param_set_uint_minmax(val
, kp
,
3132 RPC_MAX_SLOT_TABLE_LIMIT
);
3135 static struct kernel_param_ops param_ops_max_slot_table_size
= {
3136 .set
= param_set_max_slot_table_size
,
3137 .get
= param_get_uint
,
3140 #define param_check_max_slot_table_size(name, p) \
3141 __param_check(name, p, unsigned int);
3143 module_param_named(tcp_slot_table_entries
, xprt_tcp_slot_table_entries
,
3144 slot_table_size
, 0644);
3145 module_param_named(tcp_max_slot_table_entries
, xprt_max_tcp_slot_table_entries
,
3146 max_slot_table_size
, 0644);
3147 module_param_named(udp_slot_table_entries
, xprt_udp_slot_table_entries
,
3148 slot_table_size
, 0644);