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 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
68 #define XS_TCP_LINGER_TO (15U * HZ)
69 static unsigned int xs_tcp_fin_timeout __read_mostly
= XS_TCP_LINGER_TO
;
72 * We can register our own files under /proc/sys/sunrpc by
73 * calling register_sysctl_table() again. The files in that
74 * directory become the union of all files registered there.
76 * We simply need to make sure that we don't collide with
77 * 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)
189 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
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
)
219 static inline struct rpc_xprt
*xprt_from_sock(struct sock
*sk
)
221 return (struct rpc_xprt
*) sk
->sk_user_data
;
224 static inline struct sockaddr
*xs_addr(struct rpc_xprt
*xprt
)
226 return (struct sockaddr
*) &xprt
->addr
;
229 static inline struct sockaddr_un
*xs_addr_un(struct rpc_xprt
*xprt
)
231 return (struct sockaddr_un
*) &xprt
->addr
;
234 static inline struct sockaddr_in
*xs_addr_in(struct rpc_xprt
*xprt
)
236 return (struct sockaddr_in
*) &xprt
->addr
;
239 static inline struct sockaddr_in6
*xs_addr_in6(struct rpc_xprt
*xprt
)
241 return (struct sockaddr_in6
*) &xprt
->addr
;
244 static void xs_format_common_peer_addresses(struct rpc_xprt
*xprt
)
246 struct sockaddr
*sap
= xs_addr(xprt
);
247 struct sockaddr_in6
*sin6
;
248 struct sockaddr_in
*sin
;
249 struct sockaddr_un
*sun
;
252 switch (sap
->sa_family
) {
254 sun
= xs_addr_un(xprt
);
255 strlcpy(buf
, sun
->sun_path
, sizeof(buf
));
256 xprt
->address_strings
[RPC_DISPLAY_ADDR
] =
257 kstrdup(buf
, GFP_KERNEL
);
260 (void)rpc_ntop(sap
, buf
, sizeof(buf
));
261 xprt
->address_strings
[RPC_DISPLAY_ADDR
] =
262 kstrdup(buf
, GFP_KERNEL
);
263 sin
= xs_addr_in(xprt
);
264 snprintf(buf
, sizeof(buf
), "%08x", ntohl(sin
->sin_addr
.s_addr
));
267 (void)rpc_ntop(sap
, buf
, sizeof(buf
));
268 xprt
->address_strings
[RPC_DISPLAY_ADDR
] =
269 kstrdup(buf
, GFP_KERNEL
);
270 sin6
= xs_addr_in6(xprt
);
271 snprintf(buf
, sizeof(buf
), "%pi6", &sin6
->sin6_addr
);
277 xprt
->address_strings
[RPC_DISPLAY_HEX_ADDR
] = kstrdup(buf
, GFP_KERNEL
);
280 static void xs_format_common_peer_ports(struct rpc_xprt
*xprt
)
282 struct sockaddr
*sap
= xs_addr(xprt
);
285 snprintf(buf
, sizeof(buf
), "%u", rpc_get_port(sap
));
286 xprt
->address_strings
[RPC_DISPLAY_PORT
] = kstrdup(buf
, GFP_KERNEL
);
288 snprintf(buf
, sizeof(buf
), "%4hx", rpc_get_port(sap
));
289 xprt
->address_strings
[RPC_DISPLAY_HEX_PORT
] = kstrdup(buf
, GFP_KERNEL
);
292 static void xs_format_peer_addresses(struct rpc_xprt
*xprt
,
293 const char *protocol
,
296 xprt
->address_strings
[RPC_DISPLAY_PROTO
] = protocol
;
297 xprt
->address_strings
[RPC_DISPLAY_NETID
] = netid
;
298 xs_format_common_peer_addresses(xprt
);
299 xs_format_common_peer_ports(xprt
);
302 static void xs_update_peer_port(struct rpc_xprt
*xprt
)
304 kfree(xprt
->address_strings
[RPC_DISPLAY_HEX_PORT
]);
305 kfree(xprt
->address_strings
[RPC_DISPLAY_PORT
]);
307 xs_format_common_peer_ports(xprt
);
310 static void xs_free_peer_addresses(struct rpc_xprt
*xprt
)
314 for (i
= 0; i
< RPC_DISPLAY_MAX
; i
++)
316 case RPC_DISPLAY_PROTO
:
317 case RPC_DISPLAY_NETID
:
320 kfree(xprt
->address_strings
[i
]);
324 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
326 static int xs_send_kvec(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
, struct kvec
*vec
, unsigned int base
, int more
)
328 struct msghdr msg
= {
330 .msg_namelen
= addrlen
,
331 .msg_flags
= XS_SENDMSG_FLAGS
| (more
? MSG_MORE
: 0),
334 .iov_base
= vec
->iov_base
+ base
,
335 .iov_len
= vec
->iov_len
- base
,
338 if (iov
.iov_len
!= 0)
339 return kernel_sendmsg(sock
, &msg
, &iov
, 1, iov
.iov_len
);
340 return kernel_sendmsg(sock
, &msg
, NULL
, 0, 0);
343 static int xs_send_pagedata(struct socket
*sock
, struct xdr_buf
*xdr
, unsigned int base
, int more
, bool zerocopy
, int *sent_p
)
345 ssize_t (*do_sendpage
)(struct socket
*sock
, struct page
*page
,
346 int offset
, size_t size
, int flags
);
348 unsigned int remainder
;
351 remainder
= xdr
->page_len
- base
;
352 base
+= xdr
->page_base
;
353 ppage
= xdr
->pages
+ (base
>> PAGE_SHIFT
);
355 do_sendpage
= sock
->ops
->sendpage
;
357 do_sendpage
= sock_no_sendpage
;
359 unsigned int len
= min_t(unsigned int, PAGE_SIZE
- base
, remainder
);
360 int flags
= XS_SENDMSG_FLAGS
;
363 if (remainder
!= 0 || more
)
365 err
= do_sendpage(sock
, *ppage
, base
, len
, flags
);
366 if (remainder
== 0 || err
!= len
)
380 * xs_sendpages - write pages directly to a socket
381 * @sock: socket to send on
382 * @addr: UDP only -- address of destination
383 * @addrlen: UDP only -- length of destination address
384 * @xdr: buffer containing this request
385 * @base: starting position in the buffer
386 * @zerocopy: true if it is safe to use sendpage()
387 * @sent_p: return the total number of bytes successfully queued for sending
390 static int xs_sendpages(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
, struct xdr_buf
*xdr
, unsigned int base
, bool zerocopy
, int *sent_p
)
392 unsigned int remainder
= xdr
->len
- base
;
399 clear_bit(SOCK_ASYNC_NOSPACE
, &sock
->flags
);
405 if (base
< xdr
->head
[0].iov_len
|| addr
!= NULL
) {
406 unsigned int len
= xdr
->head
[0].iov_len
- base
;
408 err
= xs_send_kvec(sock
, addr
, addrlen
, &xdr
->head
[0], base
, remainder
!= 0);
409 if (remainder
== 0 || err
!= len
)
414 base
-= xdr
->head
[0].iov_len
;
416 if (base
< xdr
->page_len
) {
417 unsigned int len
= xdr
->page_len
- base
;
419 err
= xs_send_pagedata(sock
, xdr
, base
, remainder
!= 0, zerocopy
, &sent
);
421 if (remainder
== 0 || sent
!= len
)
425 base
-= xdr
->page_len
;
427 if (base
>= xdr
->tail
[0].iov_len
)
429 err
= xs_send_kvec(sock
, NULL
, 0, &xdr
->tail
[0], base
, 0);
438 static void xs_nospace_callback(struct rpc_task
*task
)
440 struct sock_xprt
*transport
= container_of(task
->tk_rqstp
->rq_xprt
, struct sock_xprt
, xprt
);
442 transport
->inet
->sk_write_pending
--;
443 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
447 * xs_nospace - place task on wait queue if transmit was incomplete
448 * @task: task to put to sleep
451 static int xs_nospace(struct rpc_task
*task
)
453 struct rpc_rqst
*req
= task
->tk_rqstp
;
454 struct rpc_xprt
*xprt
= req
->rq_xprt
;
455 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
456 struct sock
*sk
= transport
->inet
;
459 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
460 task
->tk_pid
, req
->rq_slen
- req
->rq_bytes_sent
,
463 /* Protect against races with write_space */
464 spin_lock_bh(&xprt
->transport_lock
);
466 /* Don't race with disconnect */
467 if (xprt_connected(xprt
)) {
468 if (test_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
)) {
470 * Notify TCP that we're limited by the application
473 set_bit(SOCK_NOSPACE
, &transport
->sock
->flags
);
474 sk
->sk_write_pending
++;
475 /* ...and wait for more buffer space */
476 xprt_wait_for_buffer_space(task
, xs_nospace_callback
);
479 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
483 spin_unlock_bh(&xprt
->transport_lock
);
485 /* Race breaker in case memory is freed before above code is called */
486 sk
->sk_write_space(sk
);
491 * Construct a stream transport record marker in @buf.
493 static inline void xs_encode_stream_record_marker(struct xdr_buf
*buf
)
495 u32 reclen
= buf
->len
- sizeof(rpc_fraghdr
);
496 rpc_fraghdr
*base
= buf
->head
[0].iov_base
;
497 *base
= cpu_to_be32(RPC_LAST_STREAM_FRAGMENT
| reclen
);
501 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
502 * @task: RPC task that manages the state of an RPC request
505 * 0: The request has been sent
506 * EAGAIN: The socket was blocked, please call again later to
507 * complete the request
508 * ENOTCONN: Caller needs to invoke connect logic then call again
509 * other: Some other error occured, the request was not sent
511 static int xs_local_send_request(struct rpc_task
*task
)
513 struct rpc_rqst
*req
= task
->tk_rqstp
;
514 struct rpc_xprt
*xprt
= req
->rq_xprt
;
515 struct sock_xprt
*transport
=
516 container_of(xprt
, struct sock_xprt
, xprt
);
517 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
521 xs_encode_stream_record_marker(&req
->rq_snd_buf
);
523 xs_pktdump("packet data:",
524 req
->rq_svec
->iov_base
, req
->rq_svec
->iov_len
);
526 status
= xs_sendpages(transport
->sock
, NULL
, 0, xdr
, req
->rq_bytes_sent
,
528 dprintk("RPC: %s(%u) = %d\n",
529 __func__
, xdr
->len
- req
->rq_bytes_sent
, status
);
530 if (likely(sent
> 0) || status
== 0) {
531 req
->rq_bytes_sent
+= sent
;
532 req
->rq_xmit_bytes_sent
+= sent
;
533 if (likely(req
->rq_bytes_sent
>= req
->rq_slen
)) {
534 req
->rq_bytes_sent
= 0;
543 status
= xs_nospace(task
);
546 dprintk("RPC: sendmsg returned unrecognized error %d\n",
557 * xs_udp_send_request - write an RPC request to a UDP socket
558 * @task: address of RPC task that manages the state of an RPC request
561 * 0: The request has been sent
562 * EAGAIN: The socket was blocked, please call again later to
563 * complete the request
564 * ENOTCONN: Caller needs to invoke connect logic then call again
565 * other: Some other error occurred, the request was not sent
567 static int xs_udp_send_request(struct rpc_task
*task
)
569 struct rpc_rqst
*req
= task
->tk_rqstp
;
570 struct rpc_xprt
*xprt
= req
->rq_xprt
;
571 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
572 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
576 xs_pktdump("packet data:",
577 req
->rq_svec
->iov_base
,
578 req
->rq_svec
->iov_len
);
580 if (!xprt_bound(xprt
))
582 status
= xs_sendpages(transport
->sock
, xs_addr(xprt
), xprt
->addrlen
,
583 xdr
, req
->rq_bytes_sent
, true, &sent
);
585 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
586 xdr
->len
- req
->rq_bytes_sent
, status
);
588 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
589 if (status
== -EPERM
)
592 if (sent
> 0 || status
== 0) {
593 req
->rq_xmit_bytes_sent
+= sent
;
594 if (sent
>= req
->rq_slen
)
596 /* Still some bytes left; set up for a retry later. */
604 /* Should we call xs_close() here? */
607 status
= xs_nospace(task
);
610 dprintk("RPC: sendmsg returned unrecognized error %d\n",
617 /* When the server has died, an ICMP port unreachable message
618 * prompts ECONNREFUSED. */
619 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
626 * xs_tcp_send_request - write an RPC request to a TCP socket
627 * @task: address of RPC task that manages the state of an RPC request
630 * 0: The request has been sent
631 * EAGAIN: The socket was blocked, please call again later to
632 * complete the request
633 * ENOTCONN: Caller needs to invoke connect logic then call again
634 * other: Some other error occurred, the request was not sent
636 * XXX: In the case of soft timeouts, should we eventually give up
637 * if sendmsg is not able to make progress?
639 static int xs_tcp_send_request(struct rpc_task
*task
)
641 struct rpc_rqst
*req
= task
->tk_rqstp
;
642 struct rpc_xprt
*xprt
= req
->rq_xprt
;
643 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
644 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
645 bool zerocopy
= true;
649 xs_encode_stream_record_marker(&req
->rq_snd_buf
);
651 xs_pktdump("packet data:",
652 req
->rq_svec
->iov_base
,
653 req
->rq_svec
->iov_len
);
654 /* Don't use zero copy if this is a resend. If the RPC call
655 * completes while the socket holds a reference to the pages,
656 * then we may end up resending corrupted data.
658 if (task
->tk_flags
& RPC_TASK_SENT
)
661 /* Continue transmitting the packet/record. We must be careful
662 * to cope with writespace callbacks arriving _after_ we have
663 * called sendmsg(). */
666 status
= xs_sendpages(transport
->sock
, NULL
, 0, xdr
,
667 req
->rq_bytes_sent
, zerocopy
, &sent
);
669 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
670 xdr
->len
- req
->rq_bytes_sent
, status
);
672 if (unlikely(sent
== 0 && status
< 0))
675 /* If we've sent the entire packet, immediately
676 * reset the count of bytes sent. */
677 req
->rq_bytes_sent
+= sent
;
678 req
->rq_xmit_bytes_sent
+= sent
;
679 if (likely(req
->rq_bytes_sent
>= req
->rq_slen
)) {
680 req
->rq_bytes_sent
= 0;
693 /* Should we call xs_close() here? */
697 status
= xs_nospace(task
);
700 dprintk("RPC: sendmsg returned unrecognized error %d\n",
707 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
714 * xs_tcp_release_xprt - clean up after a tcp transmission
718 * This cleans up if an error causes us to abort the transmission of a request.
719 * In this case, the socket may need to be reset in order to avoid confusing
722 static void xs_tcp_release_xprt(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
724 struct rpc_rqst
*req
;
726 if (task
!= xprt
->snd_task
)
730 req
= task
->tk_rqstp
;
733 if (req
->rq_bytes_sent
== 0)
735 if (req
->rq_bytes_sent
== req
->rq_snd_buf
.len
)
737 set_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
739 xprt_release_xprt(xprt
, task
);
742 static void xs_save_old_callbacks(struct sock_xprt
*transport
, struct sock
*sk
)
744 transport
->old_data_ready
= sk
->sk_data_ready
;
745 transport
->old_state_change
= sk
->sk_state_change
;
746 transport
->old_write_space
= sk
->sk_write_space
;
747 transport
->old_error_report
= sk
->sk_error_report
;
750 static void xs_restore_old_callbacks(struct sock_xprt
*transport
, struct sock
*sk
)
752 sk
->sk_data_ready
= transport
->old_data_ready
;
753 sk
->sk_state_change
= transport
->old_state_change
;
754 sk
->sk_write_space
= transport
->old_write_space
;
755 sk
->sk_error_report
= transport
->old_error_report
;
758 static void xs_sock_reset_connection_flags(struct rpc_xprt
*xprt
)
760 smp_mb__before_atomic();
761 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
762 clear_bit(XPRT_CLOSING
, &xprt
->state
);
763 smp_mb__after_atomic();
766 static void xs_sock_mark_closed(struct rpc_xprt
*xprt
)
768 xs_sock_reset_connection_flags(xprt
);
769 /* Mark transport as closed and wake up all pending tasks */
770 xprt_disconnect_done(xprt
);
771 xprt_force_disconnect(xprt
);
775 * xs_error_report - callback to handle TCP socket state errors
778 * Note: we don't call sock_error() since there may be a rpc_task
779 * using the socket, and so we don't want to clear sk->sk_err.
781 static void xs_error_report(struct sock
*sk
)
783 struct rpc_xprt
*xprt
;
786 read_lock_bh(&sk
->sk_callback_lock
);
787 if (!(xprt
= xprt_from_sock(sk
)))
793 /* Is this a reset event? */
794 if (sk
->sk_state
== TCP_CLOSE
)
795 xs_sock_mark_closed(xprt
);
796 dprintk("RPC: xs_error_report client %p, error=%d...\n",
798 trace_rpc_socket_error(xprt
, sk
->sk_socket
, err
);
799 xprt_wake_pending_tasks(xprt
, err
);
801 read_unlock_bh(&sk
->sk_callback_lock
);
804 static void xs_reset_transport(struct sock_xprt
*transport
)
806 struct socket
*sock
= transport
->sock
;
807 struct sock
*sk
= transport
->inet
;
808 struct rpc_xprt
*xprt
= &transport
->xprt
;
813 if (atomic_read(&transport
->xprt
.swapper
))
814 sk_clear_memalloc(sk
);
816 write_lock_bh(&sk
->sk_callback_lock
);
817 transport
->inet
= NULL
;
818 transport
->sock
= NULL
;
820 sk
->sk_user_data
= NULL
;
822 xs_restore_old_callbacks(transport
, sk
);
823 write_unlock_bh(&sk
->sk_callback_lock
);
824 xs_sock_reset_connection_flags(xprt
);
826 trace_rpc_socket_close(xprt
, sock
);
831 * xs_close - close a socket
834 * This is used when all requests are complete; ie, no DRC state remains
835 * on the server we want to save.
837 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
838 * xs_reset_transport() zeroing the socket from underneath a writer.
840 static void xs_close(struct rpc_xprt
*xprt
)
842 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
844 dprintk("RPC: xs_close xprt %p\n", xprt
);
846 xs_reset_transport(transport
);
847 xprt
->reestablish_timeout
= 0;
849 xprt_disconnect_done(xprt
);
852 static void xs_inject_disconnect(struct rpc_xprt
*xprt
)
854 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
856 xprt_disconnect_done(xprt
);
859 static void xs_xprt_free(struct rpc_xprt
*xprt
)
861 xs_free_peer_addresses(xprt
);
866 * xs_destroy - prepare to shutdown a transport
867 * @xprt: doomed transport
870 static void xs_destroy(struct rpc_xprt
*xprt
)
872 dprintk("RPC: xs_destroy xprt %p\n", xprt
);
876 module_put(THIS_MODULE
);
879 static int xs_local_copy_to_xdr(struct xdr_buf
*xdr
, struct sk_buff
*skb
)
881 struct xdr_skb_reader desc
= {
883 .offset
= sizeof(rpc_fraghdr
),
884 .count
= skb
->len
- sizeof(rpc_fraghdr
),
887 if (xdr_partial_copy_from_skb(xdr
, 0, &desc
, xdr_skb_read_bits
) < 0)
895 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
896 * @sk: socket with data to read
898 * Currently this assumes we can read the whole reply in a single gulp.
900 static void xs_local_data_ready(struct sock
*sk
)
902 struct rpc_task
*task
;
903 struct rpc_xprt
*xprt
;
904 struct rpc_rqst
*rovr
;
906 int err
, repsize
, copied
;
910 read_lock_bh(&sk
->sk_callback_lock
);
911 dprintk("RPC: %s...\n", __func__
);
912 xprt
= xprt_from_sock(sk
);
916 skb
= skb_recv_datagram(sk
, 0, 1, &err
);
920 repsize
= skb
->len
- sizeof(rpc_fraghdr
);
922 dprintk("RPC: impossible RPC reply size %d\n", repsize
);
926 /* Copy the XID from the skb... */
927 xp
= skb_header_pointer(skb
, sizeof(rpc_fraghdr
), sizeof(_xid
), &_xid
);
931 /* Look up and lock the request corresponding to the given XID */
932 spin_lock(&xprt
->transport_lock
);
933 rovr
= xprt_lookup_rqst(xprt
, *xp
);
936 task
= rovr
->rq_task
;
938 copied
= rovr
->rq_private_buf
.buflen
;
939 if (copied
> repsize
)
942 if (xs_local_copy_to_xdr(&rovr
->rq_private_buf
, skb
)) {
943 dprintk("RPC: sk_buff copy failed\n");
947 xprt_complete_rqst(task
, copied
);
950 spin_unlock(&xprt
->transport_lock
);
952 skb_free_datagram(sk
, skb
);
954 read_unlock_bh(&sk
->sk_callback_lock
);
958 * xs_udp_data_ready - "data ready" callback for UDP sockets
959 * @sk: socket with data to read
962 static void xs_udp_data_ready(struct sock
*sk
)
964 struct rpc_task
*task
;
965 struct rpc_xprt
*xprt
;
966 struct rpc_rqst
*rovr
;
968 int err
, repsize
, copied
;
972 read_lock_bh(&sk
->sk_callback_lock
);
973 dprintk("RPC: xs_udp_data_ready...\n");
974 if (!(xprt
= xprt_from_sock(sk
)))
977 if ((skb
= skb_recv_datagram(sk
, 0, 1, &err
)) == NULL
)
980 repsize
= skb
->len
- sizeof(struct udphdr
);
982 dprintk("RPC: impossible RPC reply size %d!\n", repsize
);
986 /* Copy the XID from the skb... */
987 xp
= skb_header_pointer(skb
, sizeof(struct udphdr
),
988 sizeof(_xid
), &_xid
);
992 /* Look up and lock the request corresponding to the given XID */
993 spin_lock(&xprt
->transport_lock
);
994 rovr
= xprt_lookup_rqst(xprt
, *xp
);
997 task
= rovr
->rq_task
;
999 if ((copied
= rovr
->rq_private_buf
.buflen
) > repsize
)
1002 /* Suck it into the iovec, verify checksum if not done by hw. */
1003 if (csum_partial_copy_to_xdr(&rovr
->rq_private_buf
, skb
)) {
1004 UDPX_INC_STATS_BH(sk
, UDP_MIB_INERRORS
);
1008 UDPX_INC_STATS_BH(sk
, UDP_MIB_INDATAGRAMS
);
1010 xprt_adjust_cwnd(xprt
, task
, copied
);
1011 xprt_complete_rqst(task
, copied
);
1014 spin_unlock(&xprt
->transport_lock
);
1016 skb_free_datagram(sk
, skb
);
1018 read_unlock_bh(&sk
->sk_callback_lock
);
1022 * Helper function to force a TCP close if the server is sending
1023 * junk and/or it has put us in CLOSE_WAIT
1025 static void xs_tcp_force_close(struct rpc_xprt
*xprt
)
1027 xprt_force_disconnect(xprt
);
1030 static inline void xs_tcp_read_fraghdr(struct rpc_xprt
*xprt
, struct xdr_skb_reader
*desc
)
1032 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1036 p
= ((char *) &transport
->tcp_fraghdr
) + transport
->tcp_offset
;
1037 len
= sizeof(transport
->tcp_fraghdr
) - transport
->tcp_offset
;
1038 used
= xdr_skb_read_bits(desc
, p
, len
);
1039 transport
->tcp_offset
+= used
;
1043 transport
->tcp_reclen
= ntohl(transport
->tcp_fraghdr
);
1044 if (transport
->tcp_reclen
& RPC_LAST_STREAM_FRAGMENT
)
1045 transport
->tcp_flags
|= TCP_RCV_LAST_FRAG
;
1047 transport
->tcp_flags
&= ~TCP_RCV_LAST_FRAG
;
1048 transport
->tcp_reclen
&= RPC_FRAGMENT_SIZE_MASK
;
1050 transport
->tcp_flags
&= ~TCP_RCV_COPY_FRAGHDR
;
1051 transport
->tcp_offset
= 0;
1053 /* Sanity check of the record length */
1054 if (unlikely(transport
->tcp_reclen
< 8)) {
1055 dprintk("RPC: invalid TCP record fragment length\n");
1056 xs_tcp_force_close(xprt
);
1059 dprintk("RPC: reading TCP record fragment of length %d\n",
1060 transport
->tcp_reclen
);
1063 static void xs_tcp_check_fraghdr(struct sock_xprt
*transport
)
1065 if (transport
->tcp_offset
== transport
->tcp_reclen
) {
1066 transport
->tcp_flags
|= TCP_RCV_COPY_FRAGHDR
;
1067 transport
->tcp_offset
= 0;
1068 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
) {
1069 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1070 transport
->tcp_flags
|= TCP_RCV_COPY_XID
;
1071 transport
->tcp_copied
= 0;
1076 static inline void xs_tcp_read_xid(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
1081 len
= sizeof(transport
->tcp_xid
) - transport
->tcp_offset
;
1082 dprintk("RPC: reading XID (%Zu bytes)\n", len
);
1083 p
= ((char *) &transport
->tcp_xid
) + transport
->tcp_offset
;
1084 used
= xdr_skb_read_bits(desc
, p
, len
);
1085 transport
->tcp_offset
+= used
;
1088 transport
->tcp_flags
&= ~TCP_RCV_COPY_XID
;
1089 transport
->tcp_flags
|= TCP_RCV_READ_CALLDIR
;
1090 transport
->tcp_copied
= 4;
1091 dprintk("RPC: reading %s XID %08x\n",
1092 (transport
->tcp_flags
& TCP_RPC_REPLY
) ? "reply for"
1094 ntohl(transport
->tcp_xid
));
1095 xs_tcp_check_fraghdr(transport
);
1098 static inline void xs_tcp_read_calldir(struct sock_xprt
*transport
,
1099 struct xdr_skb_reader
*desc
)
1106 * We want transport->tcp_offset to be 8 at the end of this routine
1107 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1108 * When this function is called for the first time,
1109 * transport->tcp_offset is 4 (after having already read the xid).
1111 offset
= transport
->tcp_offset
- sizeof(transport
->tcp_xid
);
1112 len
= sizeof(transport
->tcp_calldir
) - offset
;
1113 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len
);
1114 p
= ((char *) &transport
->tcp_calldir
) + offset
;
1115 used
= xdr_skb_read_bits(desc
, p
, len
);
1116 transport
->tcp_offset
+= used
;
1119 transport
->tcp_flags
&= ~TCP_RCV_READ_CALLDIR
;
1121 * We don't yet have the XDR buffer, so we will write the calldir
1122 * out after we get the buffer from the 'struct rpc_rqst'
1124 switch (ntohl(transport
->tcp_calldir
)) {
1126 transport
->tcp_flags
|= TCP_RCV_COPY_CALLDIR
;
1127 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
1128 transport
->tcp_flags
|= TCP_RPC_REPLY
;
1131 transport
->tcp_flags
|= TCP_RCV_COPY_CALLDIR
;
1132 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
1133 transport
->tcp_flags
&= ~TCP_RPC_REPLY
;
1136 dprintk("RPC: invalid request message type\n");
1137 xs_tcp_force_close(&transport
->xprt
);
1139 xs_tcp_check_fraghdr(transport
);
1142 static inline void xs_tcp_read_common(struct rpc_xprt
*xprt
,
1143 struct xdr_skb_reader
*desc
,
1144 struct rpc_rqst
*req
)
1146 struct sock_xprt
*transport
=
1147 container_of(xprt
, struct sock_xprt
, xprt
);
1148 struct xdr_buf
*rcvbuf
;
1152 rcvbuf
= &req
->rq_private_buf
;
1154 if (transport
->tcp_flags
& TCP_RCV_COPY_CALLDIR
) {
1156 * Save the RPC direction in the XDR buffer
1158 memcpy(rcvbuf
->head
[0].iov_base
+ transport
->tcp_copied
,
1159 &transport
->tcp_calldir
,
1160 sizeof(transport
->tcp_calldir
));
1161 transport
->tcp_copied
+= sizeof(transport
->tcp_calldir
);
1162 transport
->tcp_flags
&= ~TCP_RCV_COPY_CALLDIR
;
1166 if (len
> transport
->tcp_reclen
- transport
->tcp_offset
) {
1167 struct xdr_skb_reader my_desc
;
1169 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
1170 memcpy(&my_desc
, desc
, sizeof(my_desc
));
1171 my_desc
.count
= len
;
1172 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
1173 &my_desc
, xdr_skb_read_bits
);
1177 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
1178 desc
, xdr_skb_read_bits
);
1181 transport
->tcp_copied
+= r
;
1182 transport
->tcp_offset
+= r
;
1185 /* Error when copying to the receive buffer,
1186 * usually because we weren't able to allocate
1187 * additional buffer pages. All we can do now
1188 * is turn off TCP_RCV_COPY_DATA, so the request
1189 * will not receive any additional updates,
1191 * Any remaining data from this record will
1194 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1195 dprintk("RPC: XID %08x truncated request\n",
1196 ntohl(transport
->tcp_xid
));
1197 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1198 "tcp_offset = %u, tcp_reclen = %u\n",
1199 xprt
, transport
->tcp_copied
,
1200 transport
->tcp_offset
, transport
->tcp_reclen
);
1204 dprintk("RPC: XID %08x read %Zd bytes\n",
1205 ntohl(transport
->tcp_xid
), r
);
1206 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1207 "tcp_reclen = %u\n", xprt
, transport
->tcp_copied
,
1208 transport
->tcp_offset
, transport
->tcp_reclen
);
1210 if (transport
->tcp_copied
== req
->rq_private_buf
.buflen
)
1211 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1212 else if (transport
->tcp_offset
== transport
->tcp_reclen
) {
1213 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
)
1214 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1219 * Finds the request corresponding to the RPC xid and invokes the common
1220 * tcp read code to read the data.
1222 static inline int xs_tcp_read_reply(struct rpc_xprt
*xprt
,
1223 struct xdr_skb_reader
*desc
)
1225 struct sock_xprt
*transport
=
1226 container_of(xprt
, struct sock_xprt
, xprt
);
1227 struct rpc_rqst
*req
;
1229 dprintk("RPC: read reply XID %08x\n", ntohl(transport
->tcp_xid
));
1231 /* Find and lock the request corresponding to this xid */
1232 spin_lock(&xprt
->transport_lock
);
1233 req
= xprt_lookup_rqst(xprt
, transport
->tcp_xid
);
1235 dprintk("RPC: XID %08x request not found!\n",
1236 ntohl(transport
->tcp_xid
));
1237 spin_unlock(&xprt
->transport_lock
);
1241 xs_tcp_read_common(xprt
, desc
, req
);
1243 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
))
1244 xprt_complete_rqst(req
->rq_task
, transport
->tcp_copied
);
1246 spin_unlock(&xprt
->transport_lock
);
1250 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1252 * Obtains an rpc_rqst previously allocated and invokes the common
1253 * tcp read code to read the data. The result is placed in the callback
1255 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1256 * connection and return -1.
1258 static int xs_tcp_read_callback(struct rpc_xprt
*xprt
,
1259 struct xdr_skb_reader
*desc
)
1261 struct sock_xprt
*transport
=
1262 container_of(xprt
, struct sock_xprt
, xprt
);
1263 struct rpc_rqst
*req
;
1265 /* Look up and lock the request corresponding to the given XID */
1266 spin_lock(&xprt
->transport_lock
);
1267 req
= xprt_lookup_bc_request(xprt
, transport
->tcp_xid
);
1269 spin_unlock(&xprt
->transport_lock
);
1270 printk(KERN_WARNING
"Callback slot table overflowed\n");
1271 xprt_force_disconnect(xprt
);
1275 dprintk("RPC: read callback XID %08x\n", ntohl(req
->rq_xid
));
1276 xs_tcp_read_common(xprt
, desc
, req
);
1278 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
))
1279 xprt_complete_bc_request(req
, transport
->tcp_copied
);
1280 spin_unlock(&xprt
->transport_lock
);
1285 static inline int _xs_tcp_read_data(struct rpc_xprt
*xprt
,
1286 struct xdr_skb_reader
*desc
)
1288 struct sock_xprt
*transport
=
1289 container_of(xprt
, struct sock_xprt
, xprt
);
1291 return (transport
->tcp_flags
& TCP_RPC_REPLY
) ?
1292 xs_tcp_read_reply(xprt
, desc
) :
1293 xs_tcp_read_callback(xprt
, desc
);
1296 static inline int _xs_tcp_read_data(struct rpc_xprt
*xprt
,
1297 struct xdr_skb_reader
*desc
)
1299 return xs_tcp_read_reply(xprt
, desc
);
1301 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1304 * Read data off the transport. This can be either an RPC_CALL or an
1305 * RPC_REPLY. Relay the processing to helper functions.
1307 static void xs_tcp_read_data(struct rpc_xprt
*xprt
,
1308 struct xdr_skb_reader
*desc
)
1310 struct sock_xprt
*transport
=
1311 container_of(xprt
, struct sock_xprt
, xprt
);
1313 if (_xs_tcp_read_data(xprt
, desc
) == 0)
1314 xs_tcp_check_fraghdr(transport
);
1317 * The transport_lock protects the request handling.
1318 * There's no need to hold it to update the tcp_flags.
1320 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1324 static inline void xs_tcp_read_discard(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
1328 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
1329 if (len
> desc
->count
)
1332 desc
->offset
+= len
;
1333 transport
->tcp_offset
+= len
;
1334 dprintk("RPC: discarded %Zu bytes\n", len
);
1335 xs_tcp_check_fraghdr(transport
);
1338 static int xs_tcp_data_recv(read_descriptor_t
*rd_desc
, struct sk_buff
*skb
, unsigned int offset
, size_t len
)
1340 struct rpc_xprt
*xprt
= rd_desc
->arg
.data
;
1341 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1342 struct xdr_skb_reader desc
= {
1348 dprintk("RPC: xs_tcp_data_recv started\n");
1350 trace_xs_tcp_data_recv(transport
);
1351 /* Read in a new fragment marker if necessary */
1352 /* Can we ever really expect to get completely empty fragments? */
1353 if (transport
->tcp_flags
& TCP_RCV_COPY_FRAGHDR
) {
1354 xs_tcp_read_fraghdr(xprt
, &desc
);
1357 /* Read in the xid if necessary */
1358 if (transport
->tcp_flags
& TCP_RCV_COPY_XID
) {
1359 xs_tcp_read_xid(transport
, &desc
);
1362 /* Read in the call/reply flag */
1363 if (transport
->tcp_flags
& TCP_RCV_READ_CALLDIR
) {
1364 xs_tcp_read_calldir(transport
, &desc
);
1367 /* Read in the request data */
1368 if (transport
->tcp_flags
& TCP_RCV_COPY_DATA
) {
1369 xs_tcp_read_data(xprt
, &desc
);
1372 /* Skip over any trailing bytes on short reads */
1373 xs_tcp_read_discard(transport
, &desc
);
1374 } while (desc
.count
);
1375 trace_xs_tcp_data_recv(transport
);
1376 dprintk("RPC: xs_tcp_data_recv done\n");
1377 return len
- desc
.count
;
1381 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1382 * @sk: socket with data to read
1385 static void xs_tcp_data_ready(struct sock
*sk
)
1387 struct rpc_xprt
*xprt
;
1388 read_descriptor_t rd_desc
;
1390 unsigned long total
= 0;
1392 dprintk("RPC: xs_tcp_data_ready...\n");
1394 read_lock_bh(&sk
->sk_callback_lock
);
1395 if (!(xprt
= xprt_from_sock(sk
))) {
1399 /* Any data means we had a useful conversation, so
1400 * the we don't need to delay the next reconnect
1402 if (xprt
->reestablish_timeout
)
1403 xprt
->reestablish_timeout
= 0;
1405 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1406 rd_desc
.arg
.data
= xprt
;
1408 rd_desc
.count
= 65536;
1409 read
= tcp_read_sock(sk
, &rd_desc
, xs_tcp_data_recv
);
1414 trace_xs_tcp_data_ready(xprt
, read
, total
);
1415 read_unlock_bh(&sk
->sk_callback_lock
);
1419 * xs_tcp_state_change - callback to handle TCP socket state changes
1420 * @sk: socket whose state has changed
1423 static void xs_tcp_state_change(struct sock
*sk
)
1425 struct rpc_xprt
*xprt
;
1427 read_lock_bh(&sk
->sk_callback_lock
);
1428 if (!(xprt
= xprt_from_sock(sk
)))
1430 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt
);
1431 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1432 sk
->sk_state
, xprt_connected(xprt
),
1433 sock_flag(sk
, SOCK_DEAD
),
1434 sock_flag(sk
, SOCK_ZAPPED
),
1437 trace_rpc_socket_state_change(xprt
, sk
->sk_socket
);
1438 switch (sk
->sk_state
) {
1439 case TCP_ESTABLISHED
:
1440 spin_lock(&xprt
->transport_lock
);
1441 if (!xprt_test_and_set_connected(xprt
)) {
1442 struct sock_xprt
*transport
= container_of(xprt
,
1443 struct sock_xprt
, xprt
);
1445 /* Reset TCP record info */
1446 transport
->tcp_offset
= 0;
1447 transport
->tcp_reclen
= 0;
1448 transport
->tcp_copied
= 0;
1449 transport
->tcp_flags
=
1450 TCP_RCV_COPY_FRAGHDR
| TCP_RCV_COPY_XID
;
1451 xprt
->connect_cookie
++;
1453 xprt_wake_pending_tasks(xprt
, -EAGAIN
);
1455 spin_unlock(&xprt
->transport_lock
);
1458 /* The client initiated a shutdown of the socket */
1459 xprt
->connect_cookie
++;
1460 xprt
->reestablish_timeout
= 0;
1461 set_bit(XPRT_CLOSING
, &xprt
->state
);
1462 smp_mb__before_atomic();
1463 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1464 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
1465 smp_mb__after_atomic();
1467 case TCP_CLOSE_WAIT
:
1468 /* The server initiated a shutdown of the socket */
1469 xprt
->connect_cookie
++;
1470 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1471 xs_tcp_force_close(xprt
);
1474 * If the server closed down the connection, make sure that
1475 * we back off before reconnecting
1477 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
1478 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
1481 set_bit(XPRT_CLOSING
, &xprt
->state
);
1482 smp_mb__before_atomic();
1483 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1484 smp_mb__after_atomic();
1487 xs_sock_mark_closed(xprt
);
1490 read_unlock_bh(&sk
->sk_callback_lock
);
1493 static void xs_write_space(struct sock
*sk
)
1495 struct socket
*sock
;
1496 struct rpc_xprt
*xprt
;
1498 if (unlikely(!(sock
= sk
->sk_socket
)))
1500 clear_bit(SOCK_NOSPACE
, &sock
->flags
);
1502 if (unlikely(!(xprt
= xprt_from_sock(sk
))))
1504 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE
, &sock
->flags
) == 0)
1507 xprt_write_space(xprt
);
1511 * xs_udp_write_space - callback invoked when socket buffer space
1513 * @sk: socket whose state has changed
1515 * Called when more output buffer space is available for this socket.
1516 * We try not to wake our writers until they can make "significant"
1517 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1518 * with a bunch of small requests.
1520 static void xs_udp_write_space(struct sock
*sk
)
1522 read_lock_bh(&sk
->sk_callback_lock
);
1524 /* from net/core/sock.c:sock_def_write_space */
1525 if (sock_writeable(sk
))
1528 read_unlock_bh(&sk
->sk_callback_lock
);
1532 * xs_tcp_write_space - callback invoked when socket buffer space
1534 * @sk: socket whose state has changed
1536 * Called when more output buffer space is available for this socket.
1537 * We try not to wake our writers until they can make "significant"
1538 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1539 * with a bunch of small requests.
1541 static void xs_tcp_write_space(struct sock
*sk
)
1543 read_lock_bh(&sk
->sk_callback_lock
);
1545 /* from net/core/stream.c:sk_stream_write_space */
1546 if (sk_stream_is_writeable(sk
))
1549 read_unlock_bh(&sk
->sk_callback_lock
);
1552 static void xs_udp_do_set_buffer_size(struct rpc_xprt
*xprt
)
1554 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1555 struct sock
*sk
= transport
->inet
;
1557 if (transport
->rcvsize
) {
1558 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
1559 sk
->sk_rcvbuf
= transport
->rcvsize
* xprt
->max_reqs
* 2;
1561 if (transport
->sndsize
) {
1562 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
1563 sk
->sk_sndbuf
= transport
->sndsize
* xprt
->max_reqs
* 2;
1564 sk
->sk_write_space(sk
);
1569 * xs_udp_set_buffer_size - set send and receive limits
1570 * @xprt: generic transport
1571 * @sndsize: requested size of send buffer, in bytes
1572 * @rcvsize: requested size of receive buffer, in bytes
1574 * Set socket send and receive buffer size limits.
1576 static void xs_udp_set_buffer_size(struct rpc_xprt
*xprt
, size_t sndsize
, size_t rcvsize
)
1578 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1580 transport
->sndsize
= 0;
1582 transport
->sndsize
= sndsize
+ 1024;
1583 transport
->rcvsize
= 0;
1585 transport
->rcvsize
= rcvsize
+ 1024;
1587 xs_udp_do_set_buffer_size(xprt
);
1591 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1592 * @task: task that timed out
1594 * Adjust the congestion window after a retransmit timeout has occurred.
1596 static void xs_udp_timer(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
1598 xprt_adjust_cwnd(xprt
, task
, -ETIMEDOUT
);
1601 static unsigned short xs_get_random_port(void)
1603 unsigned short range
= xprt_max_resvport
- xprt_min_resvport
;
1604 unsigned short rand
= (unsigned short) prandom_u32() % range
;
1605 return rand
+ xprt_min_resvport
;
1609 * xs_set_reuseaddr_port - set the socket's port and address reuse options
1612 * Note that this function has to be called on all sockets that share the
1613 * same port, and it must be called before binding.
1615 static void xs_sock_set_reuseport(struct socket
*sock
)
1619 kernel_setsockopt(sock
, SOL_SOCKET
, SO_REUSEPORT
,
1620 (char *)&opt
, sizeof(opt
));
1623 static unsigned short xs_sock_getport(struct socket
*sock
)
1625 struct sockaddr_storage buf
;
1627 unsigned short port
= 0;
1629 if (kernel_getsockname(sock
, (struct sockaddr
*)&buf
, &buflen
) < 0)
1631 switch (buf
.ss_family
) {
1633 port
= ntohs(((struct sockaddr_in6
*)&buf
)->sin6_port
);
1636 port
= ntohs(((struct sockaddr_in
*)&buf
)->sin_port
);
1643 * xs_set_port - reset the port number in the remote endpoint address
1644 * @xprt: generic transport
1645 * @port: new port number
1648 static void xs_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1650 dprintk("RPC: setting port for xprt %p to %u\n", xprt
, port
);
1652 rpc_set_port(xs_addr(xprt
), port
);
1653 xs_update_peer_port(xprt
);
1656 static void xs_set_srcport(struct sock_xprt
*transport
, struct socket
*sock
)
1658 if (transport
->srcport
== 0)
1659 transport
->srcport
= xs_sock_getport(sock
);
1662 static unsigned short xs_get_srcport(struct sock_xprt
*transport
)
1664 unsigned short port
= transport
->srcport
;
1666 if (port
== 0 && transport
->xprt
.resvport
)
1667 port
= xs_get_random_port();
1671 static unsigned short xs_next_srcport(struct sock_xprt
*transport
, unsigned short port
)
1673 if (transport
->srcport
!= 0)
1674 transport
->srcport
= 0;
1675 if (!transport
->xprt
.resvport
)
1677 if (port
<= xprt_min_resvport
|| port
> xprt_max_resvport
)
1678 return xprt_max_resvport
;
1681 static int xs_bind(struct sock_xprt
*transport
, struct socket
*sock
)
1683 struct sockaddr_storage myaddr
;
1685 unsigned short port
= xs_get_srcport(transport
);
1686 unsigned short last
;
1689 * If we are asking for any ephemeral port (i.e. port == 0 &&
1690 * transport->xprt.resvport == 0), don't bind. Let the local
1691 * port selection happen implicitly when the socket is used
1692 * (for example at connect time).
1694 * This ensures that we can continue to establish TCP
1695 * connections even when all local ephemeral ports are already
1696 * a part of some TCP connection. This makes no difference
1697 * for UDP sockets, but also doens't harm them.
1699 * If we're asking for any reserved port (i.e. port == 0 &&
1700 * transport->xprt.resvport == 1) xs_get_srcport above will
1701 * ensure that port is non-zero and we will bind as needed.
1706 memcpy(&myaddr
, &transport
->srcaddr
, transport
->xprt
.addrlen
);
1708 rpc_set_port((struct sockaddr
*)&myaddr
, port
);
1709 err
= kernel_bind(sock
, (struct sockaddr
*)&myaddr
,
1710 transport
->xprt
.addrlen
);
1712 transport
->srcport
= port
;
1716 port
= xs_next_srcport(transport
, port
);
1719 } while (err
== -EADDRINUSE
&& nloop
!= 2);
1721 if (myaddr
.ss_family
== AF_INET
)
1722 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__
,
1723 &((struct sockaddr_in
*)&myaddr
)->sin_addr
,
1724 port
, err
? "failed" : "ok", err
);
1726 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__
,
1727 &((struct sockaddr_in6
*)&myaddr
)->sin6_addr
,
1728 port
, err
? "failed" : "ok", err
);
1733 * We don't support autobind on AF_LOCAL sockets
1735 static void xs_local_rpcbind(struct rpc_task
*task
)
1738 xprt_set_bound(rcu_dereference(task
->tk_client
->cl_xprt
));
1742 static void xs_local_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1746 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1747 static struct lock_class_key xs_key
[2];
1748 static struct lock_class_key xs_slock_key
[2];
1750 static inline void xs_reclassify_socketu(struct socket
*sock
)
1752 struct sock
*sk
= sock
->sk
;
1754 sock_lock_init_class_and_name(sk
, "slock-AF_LOCAL-RPC",
1755 &xs_slock_key
[1], "sk_lock-AF_LOCAL-RPC", &xs_key
[1]);
1758 static inline void xs_reclassify_socket4(struct socket
*sock
)
1760 struct sock
*sk
= sock
->sk
;
1762 sock_lock_init_class_and_name(sk
, "slock-AF_INET-RPC",
1763 &xs_slock_key
[0], "sk_lock-AF_INET-RPC", &xs_key
[0]);
1766 static inline void xs_reclassify_socket6(struct socket
*sock
)
1768 struct sock
*sk
= sock
->sk
;
1770 sock_lock_init_class_and_name(sk
, "slock-AF_INET6-RPC",
1771 &xs_slock_key
[1], "sk_lock-AF_INET6-RPC", &xs_key
[1]);
1774 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1776 WARN_ON_ONCE(sock_owned_by_user(sock
->sk
));
1777 if (sock_owned_by_user(sock
->sk
))
1782 xs_reclassify_socketu(sock
);
1785 xs_reclassify_socket4(sock
);
1788 xs_reclassify_socket6(sock
);
1793 static inline void xs_reclassify_socketu(struct socket
*sock
)
1797 static inline void xs_reclassify_socket4(struct socket
*sock
)
1801 static inline void xs_reclassify_socket6(struct socket
*sock
)
1805 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1810 static void xs_dummy_setup_socket(struct work_struct
*work
)
1814 static struct socket
*xs_create_sock(struct rpc_xprt
*xprt
,
1815 struct sock_xprt
*transport
, int family
, int type
,
1816 int protocol
, bool reuseport
)
1818 struct socket
*sock
;
1821 err
= __sock_create(xprt
->xprt_net
, family
, type
, protocol
, &sock
, 1);
1823 dprintk("RPC: can't create %d transport socket (%d).\n",
1827 xs_reclassify_socket(family
, sock
);
1830 xs_sock_set_reuseport(sock
);
1832 err
= xs_bind(transport
, sock
);
1840 return ERR_PTR(err
);
1843 static int xs_local_finish_connecting(struct rpc_xprt
*xprt
,
1844 struct socket
*sock
)
1846 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
1849 if (!transport
->inet
) {
1850 struct sock
*sk
= sock
->sk
;
1852 write_lock_bh(&sk
->sk_callback_lock
);
1854 xs_save_old_callbacks(transport
, sk
);
1856 sk
->sk_user_data
= xprt
;
1857 sk
->sk_data_ready
= xs_local_data_ready
;
1858 sk
->sk_write_space
= xs_udp_write_space
;
1859 sk
->sk_error_report
= xs_error_report
;
1860 sk
->sk_allocation
= GFP_ATOMIC
;
1862 xprt_clear_connected(xprt
);
1864 /* Reset to new socket */
1865 transport
->sock
= sock
;
1866 transport
->inet
= sk
;
1868 write_unlock_bh(&sk
->sk_callback_lock
);
1871 /* Tell the socket layer to start connecting... */
1872 xprt
->stat
.connect_count
++;
1873 xprt
->stat
.connect_start
= jiffies
;
1874 return kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, 0);
1878 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1879 * @transport: socket transport to connect
1881 static int xs_local_setup_socket(struct sock_xprt
*transport
)
1883 struct rpc_xprt
*xprt
= &transport
->xprt
;
1884 struct socket
*sock
;
1887 status
= __sock_create(xprt
->xprt_net
, AF_LOCAL
,
1888 SOCK_STREAM
, 0, &sock
, 1);
1890 dprintk("RPC: can't create AF_LOCAL "
1891 "transport socket (%d).\n", -status
);
1894 xs_reclassify_socketu(sock
);
1896 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1897 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1899 status
= xs_local_finish_connecting(xprt
, sock
);
1900 trace_rpc_socket_connect(xprt
, sock
, status
);
1903 dprintk("RPC: xprt %p connected to %s\n",
1904 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1905 xprt_set_connected(xprt
);
1909 dprintk("RPC: xprt %p: socket %s does not exist\n",
1910 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1913 dprintk("RPC: xprt %p: connection refused for %s\n",
1914 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1917 printk(KERN_ERR
"%s: unhandled error (%d) connecting to %s\n",
1919 xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1923 xprt_clear_connecting(xprt
);
1924 xprt_wake_pending_tasks(xprt
, status
);
1928 static void xs_local_connect(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
1930 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1933 if (RPC_IS_ASYNC(task
)) {
1935 * We want the AF_LOCAL connect to be resolved in the
1936 * filesystem namespace of the process making the rpc
1937 * call. Thus we connect synchronously.
1939 * If we want to support asynchronous AF_LOCAL calls,
1940 * we'll need to figure out how to pass a namespace to
1943 rpc_exit(task
, -ENOTCONN
);
1946 ret
= xs_local_setup_socket(transport
);
1947 if (ret
&& !RPC_IS_SOFTCONN(task
))
1948 msleep_interruptible(15000);
1951 #if IS_ENABLED(CONFIG_SUNRPC_SWAP)
1953 * Note that this should be called with XPRT_LOCKED held (or when we otherwise
1954 * know that we have exclusive access to the socket), to guard against
1955 * races with xs_reset_transport.
1957 static void xs_set_memalloc(struct rpc_xprt
*xprt
)
1959 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
1963 * If there's no sock, then we have nothing to set. The
1964 * reconnecting process will get it for us.
1966 if (!transport
->inet
)
1968 if (atomic_read(&xprt
->swapper
))
1969 sk_set_memalloc(transport
->inet
);
1973 * xs_enable_swap - Tag this transport as being used for swap.
1974 * @xprt: transport to tag
1976 * Take a reference to this transport on behalf of the rpc_clnt, and
1977 * optionally mark it for swapping if it wasn't already.
1980 xs_enable_swap(struct rpc_xprt
*xprt
)
1982 struct sock_xprt
*xs
= container_of(xprt
, struct sock_xprt
, xprt
);
1984 if (atomic_inc_return(&xprt
->swapper
) != 1)
1986 if (wait_on_bit_lock(&xprt
->state
, XPRT_LOCKED
, TASK_KILLABLE
))
1987 return -ERESTARTSYS
;
1989 sk_set_memalloc(xs
->inet
);
1990 xprt_release_xprt(xprt
, NULL
);
1995 * xs_disable_swap - Untag this transport as being used for swap.
1996 * @xprt: transport to tag
1998 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
1999 * swapper refcount goes to 0, untag the socket as a memalloc socket.
2002 xs_disable_swap(struct rpc_xprt
*xprt
)
2004 struct sock_xprt
*xs
= container_of(xprt
, struct sock_xprt
, xprt
);
2006 if (!atomic_dec_and_test(&xprt
->swapper
))
2008 if (wait_on_bit_lock(&xprt
->state
, XPRT_LOCKED
, TASK_KILLABLE
))
2011 sk_clear_memalloc(xs
->inet
);
2012 xprt_release_xprt(xprt
, NULL
);
2015 static void xs_set_memalloc(struct rpc_xprt
*xprt
)
2020 xs_enable_swap(struct rpc_xprt
*xprt
)
2026 xs_disable_swap(struct rpc_xprt
*xprt
)
2031 static void xs_udp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
2033 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2035 if (!transport
->inet
) {
2036 struct sock
*sk
= sock
->sk
;
2038 write_lock_bh(&sk
->sk_callback_lock
);
2040 xs_save_old_callbacks(transport
, sk
);
2042 sk
->sk_user_data
= xprt
;
2043 sk
->sk_data_ready
= xs_udp_data_ready
;
2044 sk
->sk_write_space
= xs_udp_write_space
;
2045 sk
->sk_allocation
= GFP_ATOMIC
;
2047 xprt_set_connected(xprt
);
2049 /* Reset to new socket */
2050 transport
->sock
= sock
;
2051 transport
->inet
= sk
;
2053 xs_set_memalloc(xprt
);
2055 write_unlock_bh(&sk
->sk_callback_lock
);
2057 xs_udp_do_set_buffer_size(xprt
);
2060 static void xs_udp_setup_socket(struct work_struct
*work
)
2062 struct sock_xprt
*transport
=
2063 container_of(work
, struct sock_xprt
, connect_worker
.work
);
2064 struct rpc_xprt
*xprt
= &transport
->xprt
;
2065 struct socket
*sock
= transport
->sock
;
2068 sock
= xs_create_sock(xprt
, transport
,
2069 xs_addr(xprt
)->sa_family
, SOCK_DGRAM
,
2070 IPPROTO_UDP
, false);
2074 dprintk("RPC: worker connecting xprt %p via %s to "
2075 "%s (port %s)\n", xprt
,
2076 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
2077 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2078 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
2080 xs_udp_finish_connecting(xprt
, sock
);
2081 trace_rpc_socket_connect(xprt
, sock
, 0);
2084 xprt_unlock_connect(xprt
, transport
);
2085 xprt_clear_connecting(xprt
);
2086 xprt_wake_pending_tasks(xprt
, status
);
2090 * xs_tcp_shutdown - gracefully shut down a TCP socket
2093 * Initiates a graceful shutdown of the TCP socket by calling the
2094 * equivalent of shutdown(SHUT_RDWR);
2096 static void xs_tcp_shutdown(struct rpc_xprt
*xprt
)
2098 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2099 struct socket
*sock
= transport
->sock
;
2103 if (xprt_connected(xprt
)) {
2104 kernel_sock_shutdown(sock
, SHUT_RDWR
);
2105 trace_rpc_socket_shutdown(xprt
, sock
);
2107 xs_reset_transport(transport
);
2110 static int xs_tcp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
2112 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2113 int ret
= -ENOTCONN
;
2115 if (!transport
->inet
) {
2116 struct sock
*sk
= sock
->sk
;
2117 unsigned int keepidle
= xprt
->timeout
->to_initval
/ HZ
;
2118 unsigned int keepcnt
= xprt
->timeout
->to_retries
+ 1;
2119 unsigned int opt_on
= 1;
2122 /* TCP Keepalive options */
2123 kernel_setsockopt(sock
, SOL_SOCKET
, SO_KEEPALIVE
,
2124 (char *)&opt_on
, sizeof(opt_on
));
2125 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPIDLE
,
2126 (char *)&keepidle
, sizeof(keepidle
));
2127 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPINTVL
,
2128 (char *)&keepidle
, sizeof(keepidle
));
2129 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPCNT
,
2130 (char *)&keepcnt
, sizeof(keepcnt
));
2132 /* TCP user timeout (see RFC5482) */
2133 timeo
= jiffies_to_msecs(xprt
->timeout
->to_initval
) *
2134 (xprt
->timeout
->to_retries
+ 1);
2135 kernel_setsockopt(sock
, SOL_TCP
, TCP_USER_TIMEOUT
,
2136 (char *)&timeo
, sizeof(timeo
));
2138 write_lock_bh(&sk
->sk_callback_lock
);
2140 xs_save_old_callbacks(transport
, sk
);
2142 sk
->sk_user_data
= xprt
;
2143 sk
->sk_data_ready
= xs_tcp_data_ready
;
2144 sk
->sk_state_change
= xs_tcp_state_change
;
2145 sk
->sk_write_space
= xs_tcp_write_space
;
2146 sk
->sk_error_report
= xs_error_report
;
2147 sk
->sk_allocation
= GFP_ATOMIC
;
2149 /* socket options */
2150 sock_reset_flag(sk
, SOCK_LINGER
);
2151 tcp_sk(sk
)->nonagle
|= TCP_NAGLE_OFF
;
2153 xprt_clear_connected(xprt
);
2155 /* Reset to new socket */
2156 transport
->sock
= sock
;
2157 transport
->inet
= sk
;
2159 write_unlock_bh(&sk
->sk_callback_lock
);
2162 if (!xprt_bound(xprt
))
2165 xs_set_memalloc(xprt
);
2167 /* Tell the socket layer to start connecting... */
2168 xprt
->stat
.connect_count
++;
2169 xprt
->stat
.connect_start
= jiffies
;
2170 ret
= kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, O_NONBLOCK
);
2173 xs_set_srcport(transport
, sock
);
2176 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
2177 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2184 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2186 * Invoked by a work queue tasklet.
2188 static void xs_tcp_setup_socket(struct work_struct
*work
)
2190 struct sock_xprt
*transport
=
2191 container_of(work
, struct sock_xprt
, connect_worker
.work
);
2192 struct socket
*sock
= transport
->sock
;
2193 struct rpc_xprt
*xprt
= &transport
->xprt
;
2197 sock
= xs_create_sock(xprt
, transport
,
2198 xs_addr(xprt
)->sa_family
, SOCK_STREAM
,
2201 status
= PTR_ERR(sock
);
2206 dprintk("RPC: worker connecting xprt %p via %s to "
2207 "%s (port %s)\n", xprt
,
2208 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
2209 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2210 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
2212 status
= xs_tcp_finish_connecting(xprt
, sock
);
2213 trace_rpc_socket_connect(xprt
, sock
, status
);
2214 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2215 xprt
, -status
, xprt_connected(xprt
),
2216 sock
->sk
->sk_state
);
2219 printk("%s: connect returned unhandled error %d\n",
2221 case -EADDRNOTAVAIL
:
2222 /* We're probably in TIME_WAIT. Get rid of existing socket,
2225 xs_tcp_force_close(xprt
);
2230 xprt_unlock_connect(xprt
, transport
);
2231 xprt_clear_connecting(xprt
);
2234 /* Happens, for instance, if the user specified a link
2235 * local IPv6 address without a scope-id.
2242 /* retry with existing socket, after a delay */
2243 xs_tcp_force_close(xprt
);
2248 xprt_unlock_connect(xprt
, transport
);
2249 xprt_clear_connecting(xprt
);
2250 xprt_wake_pending_tasks(xprt
, status
);
2254 * xs_connect - connect a socket to a remote endpoint
2255 * @xprt: pointer to transport structure
2256 * @task: address of RPC task that manages state of connect request
2258 * TCP: If the remote end dropped the connection, delay reconnecting.
2260 * UDP socket connects are synchronous, but we use a work queue anyway
2261 * to guarantee that even unprivileged user processes can set up a
2262 * socket on a privileged port.
2264 * If a UDP socket connect fails, the delay behavior here prevents
2265 * retry floods (hard mounts).
2267 static void xs_connect(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
2269 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2271 WARN_ON_ONCE(!xprt_lock_connect(xprt
, task
, transport
));
2273 /* Start by resetting any existing state */
2274 xs_reset_transport(transport
);
2276 if (transport
->sock
!= NULL
&& !RPC_IS_SOFTCONN(task
)) {
2277 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2279 xprt
, xprt
->reestablish_timeout
/ HZ
);
2280 queue_delayed_work(rpciod_workqueue
,
2281 &transport
->connect_worker
,
2282 xprt
->reestablish_timeout
);
2283 xprt
->reestablish_timeout
<<= 1;
2284 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
2285 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2286 if (xprt
->reestablish_timeout
> XS_TCP_MAX_REEST_TO
)
2287 xprt
->reestablish_timeout
= XS_TCP_MAX_REEST_TO
;
2289 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt
);
2290 queue_delayed_work(rpciod_workqueue
,
2291 &transport
->connect_worker
, 0);
2296 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2297 * @xprt: rpc_xprt struct containing statistics
2301 static void xs_local_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2305 if (xprt_connected(xprt
))
2306 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
2308 seq_printf(seq
, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2309 "%llu %llu %lu %llu %llu\n",
2310 xprt
->stat
.bind_count
,
2311 xprt
->stat
.connect_count
,
2312 xprt
->stat
.connect_time
,
2316 xprt
->stat
.bad_xids
,
2319 xprt
->stat
.max_slots
,
2320 xprt
->stat
.sending_u
,
2321 xprt
->stat
.pending_u
);
2325 * xs_udp_print_stats - display UDP socket-specifc stats
2326 * @xprt: rpc_xprt struct containing statistics
2330 static void xs_udp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2332 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2334 seq_printf(seq
, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2337 xprt
->stat
.bind_count
,
2340 xprt
->stat
.bad_xids
,
2343 xprt
->stat
.max_slots
,
2344 xprt
->stat
.sending_u
,
2345 xprt
->stat
.pending_u
);
2349 * xs_tcp_print_stats - display TCP socket-specifc stats
2350 * @xprt: rpc_xprt struct containing statistics
2354 static void xs_tcp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2356 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2359 if (xprt_connected(xprt
))
2360 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
2362 seq_printf(seq
, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2363 "%llu %llu %lu %llu %llu\n",
2365 xprt
->stat
.bind_count
,
2366 xprt
->stat
.connect_count
,
2367 xprt
->stat
.connect_time
,
2371 xprt
->stat
.bad_xids
,
2374 xprt
->stat
.max_slots
,
2375 xprt
->stat
.sending_u
,
2376 xprt
->stat
.pending_u
);
2380 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2381 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2382 * to use the server side send routines.
2384 static void *bc_malloc(struct rpc_task
*task
, size_t size
)
2387 struct rpc_buffer
*buf
;
2389 WARN_ON_ONCE(size
> PAGE_SIZE
- sizeof(struct rpc_buffer
));
2390 if (size
> PAGE_SIZE
- sizeof(struct rpc_buffer
))
2393 page
= alloc_page(GFP_KERNEL
);
2397 buf
= page_address(page
);
2398 buf
->len
= PAGE_SIZE
;
2404 * Free the space allocated in the bc_alloc routine
2406 static void bc_free(void *buffer
)
2408 struct rpc_buffer
*buf
;
2413 buf
= container_of(buffer
, struct rpc_buffer
, data
);
2414 free_page((unsigned long)buf
);
2418 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2419 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2421 static int bc_sendto(struct rpc_rqst
*req
)
2424 struct xdr_buf
*xbufp
= &req
->rq_snd_buf
;
2425 struct rpc_xprt
*xprt
= req
->rq_xprt
;
2426 struct sock_xprt
*transport
=
2427 container_of(xprt
, struct sock_xprt
, xprt
);
2428 struct socket
*sock
= transport
->sock
;
2429 unsigned long headoff
;
2430 unsigned long tailoff
;
2432 xs_encode_stream_record_marker(xbufp
);
2434 tailoff
= (unsigned long)xbufp
->tail
[0].iov_base
& ~PAGE_MASK
;
2435 headoff
= (unsigned long)xbufp
->head
[0].iov_base
& ~PAGE_MASK
;
2436 len
= svc_send_common(sock
, xbufp
,
2437 virt_to_page(xbufp
->head
[0].iov_base
), headoff
,
2438 xbufp
->tail
[0].iov_base
, tailoff
);
2440 if (len
!= xbufp
->len
) {
2441 printk(KERN_NOTICE
"Error sending entire callback!\n");
2449 * The send routine. Borrows from svc_send
2451 static int bc_send_request(struct rpc_task
*task
)
2453 struct rpc_rqst
*req
= task
->tk_rqstp
;
2454 struct svc_xprt
*xprt
;
2457 dprintk("sending request with xid: %08x\n", ntohl(req
->rq_xid
));
2459 * Get the server socket associated with this callback xprt
2461 xprt
= req
->rq_xprt
->bc_xprt
;
2464 * Grab the mutex to serialize data as the connection is shared
2465 * with the fore channel
2467 if (!mutex_trylock(&xprt
->xpt_mutex
)) {
2468 rpc_sleep_on(&xprt
->xpt_bc_pending
, task
, NULL
);
2469 if (!mutex_trylock(&xprt
->xpt_mutex
))
2471 rpc_wake_up_queued_task(&xprt
->xpt_bc_pending
, task
);
2473 if (test_bit(XPT_DEAD
, &xprt
->xpt_flags
))
2476 len
= bc_sendto(req
);
2477 mutex_unlock(&xprt
->xpt_mutex
);
2486 * The close routine. Since this is client initiated, we do nothing
2489 static void bc_close(struct rpc_xprt
*xprt
)
2494 * The xprt destroy routine. Again, because this connection is client
2495 * initiated, we do nothing
2498 static void bc_destroy(struct rpc_xprt
*xprt
)
2500 dprintk("RPC: bc_destroy xprt %p\n", xprt
);
2503 module_put(THIS_MODULE
);
2506 static struct rpc_xprt_ops xs_local_ops
= {
2507 .reserve_xprt
= xprt_reserve_xprt
,
2508 .release_xprt
= xs_tcp_release_xprt
,
2509 .alloc_slot
= xprt_alloc_slot
,
2510 .rpcbind
= xs_local_rpcbind
,
2511 .set_port
= xs_local_set_port
,
2512 .connect
= xs_local_connect
,
2513 .buf_alloc
= rpc_malloc
,
2514 .buf_free
= rpc_free
,
2515 .send_request
= xs_local_send_request
,
2516 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2518 .destroy
= xs_destroy
,
2519 .print_stats
= xs_local_print_stats
,
2520 .enable_swap
= xs_enable_swap
,
2521 .disable_swap
= xs_disable_swap
,
2524 static struct rpc_xprt_ops xs_udp_ops
= {
2525 .set_buffer_size
= xs_udp_set_buffer_size
,
2526 .reserve_xprt
= xprt_reserve_xprt_cong
,
2527 .release_xprt
= xprt_release_xprt_cong
,
2528 .alloc_slot
= xprt_alloc_slot
,
2529 .rpcbind
= rpcb_getport_async
,
2530 .set_port
= xs_set_port
,
2531 .connect
= xs_connect
,
2532 .buf_alloc
= rpc_malloc
,
2533 .buf_free
= rpc_free
,
2534 .send_request
= xs_udp_send_request
,
2535 .set_retrans_timeout
= xprt_set_retrans_timeout_rtt
,
2536 .timer
= xs_udp_timer
,
2537 .release_request
= xprt_release_rqst_cong
,
2539 .destroy
= xs_destroy
,
2540 .print_stats
= xs_udp_print_stats
,
2541 .enable_swap
= xs_enable_swap
,
2542 .disable_swap
= xs_disable_swap
,
2543 .inject_disconnect
= xs_inject_disconnect
,
2546 static struct rpc_xprt_ops xs_tcp_ops
= {
2547 .reserve_xprt
= xprt_reserve_xprt
,
2548 .release_xprt
= xs_tcp_release_xprt
,
2549 .alloc_slot
= xprt_lock_and_alloc_slot
,
2550 .rpcbind
= rpcb_getport_async
,
2551 .set_port
= xs_set_port
,
2552 .connect
= xs_connect
,
2553 .buf_alloc
= rpc_malloc
,
2554 .buf_free
= rpc_free
,
2555 .send_request
= xs_tcp_send_request
,
2556 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2557 .close
= xs_tcp_shutdown
,
2558 .destroy
= xs_destroy
,
2559 .print_stats
= xs_tcp_print_stats
,
2560 .enable_swap
= xs_enable_swap
,
2561 .disable_swap
= xs_disable_swap
,
2562 .inject_disconnect
= xs_inject_disconnect
,
2566 * The rpc_xprt_ops for the server backchannel
2569 static struct rpc_xprt_ops bc_tcp_ops
= {
2570 .reserve_xprt
= xprt_reserve_xprt
,
2571 .release_xprt
= xprt_release_xprt
,
2572 .alloc_slot
= xprt_alloc_slot
,
2573 .buf_alloc
= bc_malloc
,
2574 .buf_free
= bc_free
,
2575 .send_request
= bc_send_request
,
2576 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2578 .destroy
= bc_destroy
,
2579 .print_stats
= xs_tcp_print_stats
,
2580 .enable_swap
= xs_enable_swap
,
2581 .disable_swap
= xs_disable_swap
,
2582 .inject_disconnect
= xs_inject_disconnect
,
2585 static int xs_init_anyaddr(const int family
, struct sockaddr
*sap
)
2587 static const struct sockaddr_in sin
= {
2588 .sin_family
= AF_INET
,
2589 .sin_addr
.s_addr
= htonl(INADDR_ANY
),
2591 static const struct sockaddr_in6 sin6
= {
2592 .sin6_family
= AF_INET6
,
2593 .sin6_addr
= IN6ADDR_ANY_INIT
,
2600 memcpy(sap
, &sin
, sizeof(sin
));
2603 memcpy(sap
, &sin6
, sizeof(sin6
));
2606 dprintk("RPC: %s: Bad address family\n", __func__
);
2607 return -EAFNOSUPPORT
;
2612 static struct rpc_xprt
*xs_setup_xprt(struct xprt_create
*args
,
2613 unsigned int slot_table_size
,
2614 unsigned int max_slot_table_size
)
2616 struct rpc_xprt
*xprt
;
2617 struct sock_xprt
*new;
2619 if (args
->addrlen
> sizeof(xprt
->addr
)) {
2620 dprintk("RPC: xs_setup_xprt: address too large\n");
2621 return ERR_PTR(-EBADF
);
2624 xprt
= xprt_alloc(args
->net
, sizeof(*new), slot_table_size
,
2625 max_slot_table_size
);
2627 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2629 return ERR_PTR(-ENOMEM
);
2632 new = container_of(xprt
, struct sock_xprt
, xprt
);
2633 memcpy(&xprt
->addr
, args
->dstaddr
, args
->addrlen
);
2634 xprt
->addrlen
= args
->addrlen
;
2636 memcpy(&new->srcaddr
, args
->srcaddr
, args
->addrlen
);
2639 err
= xs_init_anyaddr(args
->dstaddr
->sa_family
,
2640 (struct sockaddr
*)&new->srcaddr
);
2643 return ERR_PTR(err
);
2650 static const struct rpc_timeout xs_local_default_timeout
= {
2651 .to_initval
= 10 * HZ
,
2652 .to_maxval
= 10 * HZ
,
2657 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2658 * @args: rpc transport creation arguments
2660 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2662 static struct rpc_xprt
*xs_setup_local(struct xprt_create
*args
)
2664 struct sockaddr_un
*sun
= (struct sockaddr_un
*)args
->dstaddr
;
2665 struct sock_xprt
*transport
;
2666 struct rpc_xprt
*xprt
;
2667 struct rpc_xprt
*ret
;
2669 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2670 xprt_max_tcp_slot_table_entries
);
2673 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2676 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2677 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2679 xprt
->bind_timeout
= XS_BIND_TO
;
2680 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2681 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2683 xprt
->ops
= &xs_local_ops
;
2684 xprt
->timeout
= &xs_local_default_timeout
;
2686 INIT_DELAYED_WORK(&transport
->connect_worker
,
2687 xs_dummy_setup_socket
);
2689 switch (sun
->sun_family
) {
2691 if (sun
->sun_path
[0] != '/') {
2692 dprintk("RPC: bad AF_LOCAL address: %s\n",
2694 ret
= ERR_PTR(-EINVAL
);
2697 xprt_set_bound(xprt
);
2698 xs_format_peer_addresses(xprt
, "local", RPCBIND_NETID_LOCAL
);
2699 ret
= ERR_PTR(xs_local_setup_socket(transport
));
2704 ret
= ERR_PTR(-EAFNOSUPPORT
);
2708 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2709 xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
2711 if (try_module_get(THIS_MODULE
))
2713 ret
= ERR_PTR(-EINVAL
);
2719 static const struct rpc_timeout xs_udp_default_timeout
= {
2720 .to_initval
= 5 * HZ
,
2721 .to_maxval
= 30 * HZ
,
2722 .to_increment
= 5 * HZ
,
2727 * xs_setup_udp - Set up transport to use a UDP socket
2728 * @args: rpc transport creation arguments
2731 static struct rpc_xprt
*xs_setup_udp(struct xprt_create
*args
)
2733 struct sockaddr
*addr
= args
->dstaddr
;
2734 struct rpc_xprt
*xprt
;
2735 struct sock_xprt
*transport
;
2736 struct rpc_xprt
*ret
;
2738 xprt
= xs_setup_xprt(args
, xprt_udp_slot_table_entries
,
2739 xprt_udp_slot_table_entries
);
2742 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2744 xprt
->prot
= IPPROTO_UDP
;
2746 /* XXX: header size can vary due to auth type, IPv6, etc. */
2747 xprt
->max_payload
= (1U << 16) - (MAX_HEADER
<< 3);
2749 xprt
->bind_timeout
= XS_BIND_TO
;
2750 xprt
->reestablish_timeout
= XS_UDP_REEST_TO
;
2751 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2753 xprt
->ops
= &xs_udp_ops
;
2755 xprt
->timeout
= &xs_udp_default_timeout
;
2757 switch (addr
->sa_family
) {
2759 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2760 xprt_set_bound(xprt
);
2762 INIT_DELAYED_WORK(&transport
->connect_worker
,
2763 xs_udp_setup_socket
);
2764 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP
);
2767 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2768 xprt_set_bound(xprt
);
2770 INIT_DELAYED_WORK(&transport
->connect_worker
,
2771 xs_udp_setup_socket
);
2772 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP6
);
2775 ret
= ERR_PTR(-EAFNOSUPPORT
);
2779 if (xprt_bound(xprt
))
2780 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2781 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2782 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2783 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2785 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2786 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2787 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2789 if (try_module_get(THIS_MODULE
))
2791 ret
= ERR_PTR(-EINVAL
);
2797 static const struct rpc_timeout xs_tcp_default_timeout
= {
2798 .to_initval
= 60 * HZ
,
2799 .to_maxval
= 60 * HZ
,
2804 * xs_setup_tcp - Set up transport to use a TCP socket
2805 * @args: rpc transport creation arguments
2808 static struct rpc_xprt
*xs_setup_tcp(struct xprt_create
*args
)
2810 struct sockaddr
*addr
= args
->dstaddr
;
2811 struct rpc_xprt
*xprt
;
2812 struct sock_xprt
*transport
;
2813 struct rpc_xprt
*ret
;
2814 unsigned int max_slot_table_size
= xprt_max_tcp_slot_table_entries
;
2816 if (args
->flags
& XPRT_CREATE_INFINITE_SLOTS
)
2817 max_slot_table_size
= RPC_MAX_SLOT_TABLE_LIMIT
;
2819 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2820 max_slot_table_size
);
2823 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2825 xprt
->prot
= IPPROTO_TCP
;
2826 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2827 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2829 xprt
->bind_timeout
= XS_BIND_TO
;
2830 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2831 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2833 xprt
->ops
= &xs_tcp_ops
;
2834 xprt
->timeout
= &xs_tcp_default_timeout
;
2836 switch (addr
->sa_family
) {
2838 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2839 xprt_set_bound(xprt
);
2841 INIT_DELAYED_WORK(&transport
->connect_worker
,
2842 xs_tcp_setup_socket
);
2843 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP
);
2846 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2847 xprt_set_bound(xprt
);
2849 INIT_DELAYED_WORK(&transport
->connect_worker
,
2850 xs_tcp_setup_socket
);
2851 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP6
);
2854 ret
= ERR_PTR(-EAFNOSUPPORT
);
2858 if (xprt_bound(xprt
))
2859 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2860 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2861 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2862 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2864 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2865 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2866 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2868 if (try_module_get(THIS_MODULE
))
2870 ret
= ERR_PTR(-EINVAL
);
2877 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2878 * @args: rpc transport creation arguments
2881 static struct rpc_xprt
*xs_setup_bc_tcp(struct xprt_create
*args
)
2883 struct sockaddr
*addr
= args
->dstaddr
;
2884 struct rpc_xprt
*xprt
;
2885 struct sock_xprt
*transport
;
2886 struct svc_sock
*bc_sock
;
2887 struct rpc_xprt
*ret
;
2889 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2890 xprt_tcp_slot_table_entries
);
2893 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2895 xprt
->prot
= IPPROTO_TCP
;
2896 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2897 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2898 xprt
->timeout
= &xs_tcp_default_timeout
;
2901 xprt_set_bound(xprt
);
2902 xprt
->bind_timeout
= 0;
2903 xprt
->reestablish_timeout
= 0;
2904 xprt
->idle_timeout
= 0;
2906 xprt
->ops
= &bc_tcp_ops
;
2908 switch (addr
->sa_family
) {
2910 xs_format_peer_addresses(xprt
, "tcp",
2914 xs_format_peer_addresses(xprt
, "tcp",
2915 RPCBIND_NETID_TCP6
);
2918 ret
= ERR_PTR(-EAFNOSUPPORT
);
2922 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2923 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2924 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2925 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2928 * Once we've associated a backchannel xprt with a connection,
2929 * we want to keep it around as long as the connection lasts,
2930 * in case we need to start using it for a backchannel again;
2931 * this reference won't be dropped until bc_xprt is destroyed.
2934 args
->bc_xprt
->xpt_bc_xprt
= xprt
;
2935 xprt
->bc_xprt
= args
->bc_xprt
;
2936 bc_sock
= container_of(args
->bc_xprt
, struct svc_sock
, sk_xprt
);
2937 transport
->sock
= bc_sock
->sk_sock
;
2938 transport
->inet
= bc_sock
->sk_sk
;
2941 * Since we don't want connections for the backchannel, we set
2942 * the xprt status to connected
2944 xprt_set_connected(xprt
);
2946 if (try_module_get(THIS_MODULE
))
2949 args
->bc_xprt
->xpt_bc_xprt
= NULL
;
2951 ret
= ERR_PTR(-EINVAL
);
2957 static struct xprt_class xs_local_transport
= {
2958 .list
= LIST_HEAD_INIT(xs_local_transport
.list
),
2959 .name
= "named UNIX socket",
2960 .owner
= THIS_MODULE
,
2961 .ident
= XPRT_TRANSPORT_LOCAL
,
2962 .setup
= xs_setup_local
,
2965 static struct xprt_class xs_udp_transport
= {
2966 .list
= LIST_HEAD_INIT(xs_udp_transport
.list
),
2968 .owner
= THIS_MODULE
,
2969 .ident
= XPRT_TRANSPORT_UDP
,
2970 .setup
= xs_setup_udp
,
2973 static struct xprt_class xs_tcp_transport
= {
2974 .list
= LIST_HEAD_INIT(xs_tcp_transport
.list
),
2976 .owner
= THIS_MODULE
,
2977 .ident
= XPRT_TRANSPORT_TCP
,
2978 .setup
= xs_setup_tcp
,
2981 static struct xprt_class xs_bc_tcp_transport
= {
2982 .list
= LIST_HEAD_INIT(xs_bc_tcp_transport
.list
),
2983 .name
= "tcp NFSv4.1 backchannel",
2984 .owner
= THIS_MODULE
,
2985 .ident
= XPRT_TRANSPORT_BC_TCP
,
2986 .setup
= xs_setup_bc_tcp
,
2990 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2993 int init_socket_xprt(void)
2995 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
2996 if (!sunrpc_table_header
)
2997 sunrpc_table_header
= register_sysctl_table(sunrpc_table
);
3000 xprt_register_transport(&xs_local_transport
);
3001 xprt_register_transport(&xs_udp_transport
);
3002 xprt_register_transport(&xs_tcp_transport
);
3003 xprt_register_transport(&xs_bc_tcp_transport
);
3009 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3012 void cleanup_socket_xprt(void)
3014 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3015 if (sunrpc_table_header
) {
3016 unregister_sysctl_table(sunrpc_table_header
);
3017 sunrpc_table_header
= NULL
;
3021 xprt_unregister_transport(&xs_local_transport
);
3022 xprt_unregister_transport(&xs_udp_transport
);
3023 xprt_unregister_transport(&xs_tcp_transport
);
3024 xprt_unregister_transport(&xs_bc_tcp_transport
);
3027 static int param_set_uint_minmax(const char *val
,
3028 const struct kernel_param
*kp
,
3029 unsigned int min
, unsigned int max
)
3036 ret
= kstrtouint(val
, 0, &num
);
3037 if (ret
== -EINVAL
|| num
< min
|| num
> max
)
3039 *((unsigned int *)kp
->arg
) = num
;
3043 static int param_set_portnr(const char *val
, const struct kernel_param
*kp
)
3045 return param_set_uint_minmax(val
, kp
,
3050 static const struct kernel_param_ops param_ops_portnr
= {
3051 .set
= param_set_portnr
,
3052 .get
= param_get_uint
,
3055 #define param_check_portnr(name, p) \
3056 __param_check(name, p, unsigned int);
3058 module_param_named(min_resvport
, xprt_min_resvport
, portnr
, 0644);
3059 module_param_named(max_resvport
, xprt_max_resvport
, portnr
, 0644);
3061 static int param_set_slot_table_size(const char *val
,
3062 const struct kernel_param
*kp
)
3064 return param_set_uint_minmax(val
, kp
,
3066 RPC_MAX_SLOT_TABLE
);
3069 static const struct kernel_param_ops param_ops_slot_table_size
= {
3070 .set
= param_set_slot_table_size
,
3071 .get
= param_get_uint
,
3074 #define param_check_slot_table_size(name, p) \
3075 __param_check(name, p, unsigned int);
3077 static int param_set_max_slot_table_size(const char *val
,
3078 const struct kernel_param
*kp
)
3080 return param_set_uint_minmax(val
, kp
,
3082 RPC_MAX_SLOT_TABLE_LIMIT
);
3085 static const struct kernel_param_ops param_ops_max_slot_table_size
= {
3086 .set
= param_set_max_slot_table_size
,
3087 .get
= param_get_uint
,
3090 #define param_check_max_slot_table_size(name, p) \
3091 __param_check(name, p, unsigned int);
3093 module_param_named(tcp_slot_table_entries
, xprt_tcp_slot_table_entries
,
3094 slot_table_size
, 0644);
3095 module_param_named(tcp_max_slot_table_entries
, xprt_max_tcp_slot_table_entries
,
3096 max_slot_table_size
, 0644);
3097 module_param_named(udp_slot_table_entries
, xprt_udp_slot_table_entries
,
3098 slot_table_size
, 0644);