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_shutdown - gracefully shut down a TCP socket
629 * Initiates a graceful shutdown of the TCP socket by calling the
630 * equivalent of shutdown(SHUT_RDWR);
632 static void xs_tcp_shutdown(struct rpc_xprt
*xprt
)
634 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
635 struct socket
*sock
= transport
->sock
;
638 kernel_sock_shutdown(sock
, SHUT_RDWR
);
639 trace_rpc_socket_shutdown(xprt
, sock
);
644 * xs_tcp_send_request - write an RPC request to a TCP socket
645 * @task: address of RPC task that manages the state of an RPC request
648 * 0: The request has been sent
649 * EAGAIN: The socket was blocked, please call again later to
650 * complete the request
651 * ENOTCONN: Caller needs to invoke connect logic then call again
652 * other: Some other error occurred, the request was not sent
654 * XXX: In the case of soft timeouts, should we eventually give up
655 * if sendmsg is not able to make progress?
657 static int xs_tcp_send_request(struct rpc_task
*task
)
659 struct rpc_rqst
*req
= task
->tk_rqstp
;
660 struct rpc_xprt
*xprt
= req
->rq_xprt
;
661 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
662 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
663 bool zerocopy
= true;
667 xs_encode_stream_record_marker(&req
->rq_snd_buf
);
669 xs_pktdump("packet data:",
670 req
->rq_svec
->iov_base
,
671 req
->rq_svec
->iov_len
);
672 /* Don't use zero copy if this is a resend. If the RPC call
673 * completes while the socket holds a reference to the pages,
674 * then we may end up resending corrupted data.
676 if (task
->tk_flags
& RPC_TASK_SENT
)
679 /* Continue transmitting the packet/record. We must be careful
680 * to cope with writespace callbacks arriving _after_ we have
681 * called sendmsg(). */
684 status
= xs_sendpages(transport
->sock
, NULL
, 0, xdr
,
685 req
->rq_bytes_sent
, zerocopy
, &sent
);
687 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
688 xdr
->len
- req
->rq_bytes_sent
, status
);
690 if (unlikely(sent
== 0 && status
< 0))
693 /* If we've sent the entire packet, immediately
694 * reset the count of bytes sent. */
695 req
->rq_bytes_sent
+= sent
;
696 req
->rq_xmit_bytes_sent
+= sent
;
697 if (likely(req
->rq_bytes_sent
>= req
->rq_slen
)) {
698 req
->rq_bytes_sent
= 0;
711 /* Should we call xs_close() here? */
715 status
= xs_nospace(task
);
718 dprintk("RPC: sendmsg returned unrecognized error %d\n",
725 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
732 * xs_tcp_release_xprt - clean up after a tcp transmission
736 * This cleans up if an error causes us to abort the transmission of a request.
737 * In this case, the socket may need to be reset in order to avoid confusing
740 static void xs_tcp_release_xprt(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
742 struct rpc_rqst
*req
;
744 if (task
!= xprt
->snd_task
)
748 req
= task
->tk_rqstp
;
751 if (req
->rq_bytes_sent
== 0)
753 if (req
->rq_bytes_sent
== req
->rq_snd_buf
.len
)
755 set_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
757 xprt_release_xprt(xprt
, task
);
760 static void xs_save_old_callbacks(struct sock_xprt
*transport
, struct sock
*sk
)
762 transport
->old_data_ready
= sk
->sk_data_ready
;
763 transport
->old_state_change
= sk
->sk_state_change
;
764 transport
->old_write_space
= sk
->sk_write_space
;
765 transport
->old_error_report
= sk
->sk_error_report
;
768 static void xs_restore_old_callbacks(struct sock_xprt
*transport
, struct sock
*sk
)
770 sk
->sk_data_ready
= transport
->old_data_ready
;
771 sk
->sk_state_change
= transport
->old_state_change
;
772 sk
->sk_write_space
= transport
->old_write_space
;
773 sk
->sk_error_report
= transport
->old_error_report
;
776 static void xs_sock_reset_connection_flags(struct rpc_xprt
*xprt
)
778 smp_mb__before_atomic();
779 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
780 clear_bit(XPRT_CLOSING
, &xprt
->state
);
781 smp_mb__after_atomic();
784 static void xs_sock_mark_closed(struct rpc_xprt
*xprt
)
786 xs_sock_reset_connection_flags(xprt
);
787 /* Mark transport as closed and wake up all pending tasks */
788 xprt_disconnect_done(xprt
);
792 * xs_error_report - callback to handle TCP socket state errors
795 * Note: we don't call sock_error() since there may be a rpc_task
796 * using the socket, and so we don't want to clear sk->sk_err.
798 static void xs_error_report(struct sock
*sk
)
800 struct rpc_xprt
*xprt
;
803 read_lock_bh(&sk
->sk_callback_lock
);
804 if (!(xprt
= xprt_from_sock(sk
)))
810 /* Is this a reset event? */
811 if (sk
->sk_state
== TCP_CLOSE
)
812 xs_sock_mark_closed(xprt
);
813 dprintk("RPC: xs_error_report client %p, error=%d...\n",
815 trace_rpc_socket_error(xprt
, sk
->sk_socket
, err
);
816 xprt_wake_pending_tasks(xprt
, err
);
818 read_unlock_bh(&sk
->sk_callback_lock
);
821 static void xs_reset_transport(struct sock_xprt
*transport
)
823 struct socket
*sock
= transport
->sock
;
824 struct sock
*sk
= transport
->inet
;
825 struct rpc_xprt
*xprt
= &transport
->xprt
;
830 if (atomic_read(&transport
->xprt
.swapper
))
831 sk_clear_memalloc(sk
);
833 write_lock_bh(&sk
->sk_callback_lock
);
834 transport
->inet
= NULL
;
835 transport
->sock
= NULL
;
837 sk
->sk_user_data
= NULL
;
839 xs_restore_old_callbacks(transport
, sk
);
840 write_unlock_bh(&sk
->sk_callback_lock
);
841 xs_sock_reset_connection_flags(xprt
);
843 trace_rpc_socket_close(xprt
, sock
);
848 * xs_close - close a socket
851 * This is used when all requests are complete; ie, no DRC state remains
852 * on the server we want to save.
854 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
855 * xs_reset_transport() zeroing the socket from underneath a writer.
857 static void xs_close(struct rpc_xprt
*xprt
)
859 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
861 dprintk("RPC: xs_close xprt %p\n", xprt
);
863 xs_reset_transport(transport
);
864 xprt
->reestablish_timeout
= 0;
866 xprt_disconnect_done(xprt
);
869 static void xs_xprt_free(struct rpc_xprt
*xprt
)
871 xs_free_peer_addresses(xprt
);
876 * xs_destroy - prepare to shutdown a transport
877 * @xprt: doomed transport
880 static void xs_destroy(struct rpc_xprt
*xprt
)
882 dprintk("RPC: xs_destroy xprt %p\n", xprt
);
886 module_put(THIS_MODULE
);
889 static int xs_local_copy_to_xdr(struct xdr_buf
*xdr
, struct sk_buff
*skb
)
891 struct xdr_skb_reader desc
= {
893 .offset
= sizeof(rpc_fraghdr
),
894 .count
= skb
->len
- sizeof(rpc_fraghdr
),
897 if (xdr_partial_copy_from_skb(xdr
, 0, &desc
, xdr_skb_read_bits
) < 0)
905 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
906 * @sk: socket with data to read
908 * Currently this assumes we can read the whole reply in a single gulp.
910 static void xs_local_data_ready(struct sock
*sk
)
912 struct rpc_task
*task
;
913 struct rpc_xprt
*xprt
;
914 struct rpc_rqst
*rovr
;
916 int err
, repsize
, copied
;
920 read_lock_bh(&sk
->sk_callback_lock
);
921 dprintk("RPC: %s...\n", __func__
);
922 xprt
= xprt_from_sock(sk
);
926 skb
= skb_recv_datagram(sk
, 0, 1, &err
);
930 repsize
= skb
->len
- sizeof(rpc_fraghdr
);
932 dprintk("RPC: impossible RPC reply size %d\n", repsize
);
936 /* Copy the XID from the skb... */
937 xp
= skb_header_pointer(skb
, sizeof(rpc_fraghdr
), sizeof(_xid
), &_xid
);
941 /* Look up and lock the request corresponding to the given XID */
942 spin_lock(&xprt
->transport_lock
);
943 rovr
= xprt_lookup_rqst(xprt
, *xp
);
946 task
= rovr
->rq_task
;
948 copied
= rovr
->rq_private_buf
.buflen
;
949 if (copied
> repsize
)
952 if (xs_local_copy_to_xdr(&rovr
->rq_private_buf
, skb
)) {
953 dprintk("RPC: sk_buff copy failed\n");
957 xprt_complete_rqst(task
, copied
);
960 spin_unlock(&xprt
->transport_lock
);
962 skb_free_datagram(sk
, skb
);
964 read_unlock_bh(&sk
->sk_callback_lock
);
968 * xs_udp_data_ready - "data ready" callback for UDP sockets
969 * @sk: socket with data to read
972 static void xs_udp_data_ready(struct sock
*sk
)
974 struct rpc_task
*task
;
975 struct rpc_xprt
*xprt
;
976 struct rpc_rqst
*rovr
;
978 int err
, repsize
, copied
;
982 read_lock_bh(&sk
->sk_callback_lock
);
983 dprintk("RPC: xs_udp_data_ready...\n");
984 if (!(xprt
= xprt_from_sock(sk
)))
987 if ((skb
= skb_recv_datagram(sk
, 0, 1, &err
)) == NULL
)
990 repsize
= skb
->len
- sizeof(struct udphdr
);
992 dprintk("RPC: impossible RPC reply size %d!\n", repsize
);
996 /* Copy the XID from the skb... */
997 xp
= skb_header_pointer(skb
, sizeof(struct udphdr
),
998 sizeof(_xid
), &_xid
);
1002 /* Look up and lock the request corresponding to the given XID */
1003 spin_lock(&xprt
->transport_lock
);
1004 rovr
= xprt_lookup_rqst(xprt
, *xp
);
1007 task
= rovr
->rq_task
;
1009 if ((copied
= rovr
->rq_private_buf
.buflen
) > repsize
)
1012 /* Suck it into the iovec, verify checksum if not done by hw. */
1013 if (csum_partial_copy_to_xdr(&rovr
->rq_private_buf
, skb
)) {
1014 UDPX_INC_STATS_BH(sk
, UDP_MIB_INERRORS
);
1018 UDPX_INC_STATS_BH(sk
, UDP_MIB_INDATAGRAMS
);
1020 xprt_adjust_cwnd(xprt
, task
, copied
);
1021 xprt_complete_rqst(task
, copied
);
1024 spin_unlock(&xprt
->transport_lock
);
1026 skb_free_datagram(sk
, skb
);
1028 read_unlock_bh(&sk
->sk_callback_lock
);
1032 * Helper function to force a TCP close if the server is sending
1033 * junk and/or it has put us in CLOSE_WAIT
1035 static void xs_tcp_force_close(struct rpc_xprt
*xprt
)
1037 xprt_force_disconnect(xprt
);
1040 static inline void xs_tcp_read_fraghdr(struct rpc_xprt
*xprt
, struct xdr_skb_reader
*desc
)
1042 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1046 p
= ((char *) &transport
->tcp_fraghdr
) + transport
->tcp_offset
;
1047 len
= sizeof(transport
->tcp_fraghdr
) - transport
->tcp_offset
;
1048 used
= xdr_skb_read_bits(desc
, p
, len
);
1049 transport
->tcp_offset
+= used
;
1053 transport
->tcp_reclen
= ntohl(transport
->tcp_fraghdr
);
1054 if (transport
->tcp_reclen
& RPC_LAST_STREAM_FRAGMENT
)
1055 transport
->tcp_flags
|= TCP_RCV_LAST_FRAG
;
1057 transport
->tcp_flags
&= ~TCP_RCV_LAST_FRAG
;
1058 transport
->tcp_reclen
&= RPC_FRAGMENT_SIZE_MASK
;
1060 transport
->tcp_flags
&= ~TCP_RCV_COPY_FRAGHDR
;
1061 transport
->tcp_offset
= 0;
1063 /* Sanity check of the record length */
1064 if (unlikely(transport
->tcp_reclen
< 8)) {
1065 dprintk("RPC: invalid TCP record fragment length\n");
1066 xs_tcp_force_close(xprt
);
1069 dprintk("RPC: reading TCP record fragment of length %d\n",
1070 transport
->tcp_reclen
);
1073 static void xs_tcp_check_fraghdr(struct sock_xprt
*transport
)
1075 if (transport
->tcp_offset
== transport
->tcp_reclen
) {
1076 transport
->tcp_flags
|= TCP_RCV_COPY_FRAGHDR
;
1077 transport
->tcp_offset
= 0;
1078 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
) {
1079 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1080 transport
->tcp_flags
|= TCP_RCV_COPY_XID
;
1081 transport
->tcp_copied
= 0;
1086 static inline void xs_tcp_read_xid(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
1091 len
= sizeof(transport
->tcp_xid
) - transport
->tcp_offset
;
1092 dprintk("RPC: reading XID (%Zu bytes)\n", len
);
1093 p
= ((char *) &transport
->tcp_xid
) + transport
->tcp_offset
;
1094 used
= xdr_skb_read_bits(desc
, p
, len
);
1095 transport
->tcp_offset
+= used
;
1098 transport
->tcp_flags
&= ~TCP_RCV_COPY_XID
;
1099 transport
->tcp_flags
|= TCP_RCV_READ_CALLDIR
;
1100 transport
->tcp_copied
= 4;
1101 dprintk("RPC: reading %s XID %08x\n",
1102 (transport
->tcp_flags
& TCP_RPC_REPLY
) ? "reply for"
1104 ntohl(transport
->tcp_xid
));
1105 xs_tcp_check_fraghdr(transport
);
1108 static inline void xs_tcp_read_calldir(struct sock_xprt
*transport
,
1109 struct xdr_skb_reader
*desc
)
1116 * We want transport->tcp_offset to be 8 at the end of this routine
1117 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1118 * When this function is called for the first time,
1119 * transport->tcp_offset is 4 (after having already read the xid).
1121 offset
= transport
->tcp_offset
- sizeof(transport
->tcp_xid
);
1122 len
= sizeof(transport
->tcp_calldir
) - offset
;
1123 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len
);
1124 p
= ((char *) &transport
->tcp_calldir
) + offset
;
1125 used
= xdr_skb_read_bits(desc
, p
, len
);
1126 transport
->tcp_offset
+= used
;
1129 transport
->tcp_flags
&= ~TCP_RCV_READ_CALLDIR
;
1131 * We don't yet have the XDR buffer, so we will write the calldir
1132 * out after we get the buffer from the 'struct rpc_rqst'
1134 switch (ntohl(transport
->tcp_calldir
)) {
1136 transport
->tcp_flags
|= TCP_RCV_COPY_CALLDIR
;
1137 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
1138 transport
->tcp_flags
|= TCP_RPC_REPLY
;
1141 transport
->tcp_flags
|= TCP_RCV_COPY_CALLDIR
;
1142 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
1143 transport
->tcp_flags
&= ~TCP_RPC_REPLY
;
1146 dprintk("RPC: invalid request message type\n");
1147 xs_tcp_force_close(&transport
->xprt
);
1149 xs_tcp_check_fraghdr(transport
);
1152 static inline void xs_tcp_read_common(struct rpc_xprt
*xprt
,
1153 struct xdr_skb_reader
*desc
,
1154 struct rpc_rqst
*req
)
1156 struct sock_xprt
*transport
=
1157 container_of(xprt
, struct sock_xprt
, xprt
);
1158 struct xdr_buf
*rcvbuf
;
1162 rcvbuf
= &req
->rq_private_buf
;
1164 if (transport
->tcp_flags
& TCP_RCV_COPY_CALLDIR
) {
1166 * Save the RPC direction in the XDR buffer
1168 memcpy(rcvbuf
->head
[0].iov_base
+ transport
->tcp_copied
,
1169 &transport
->tcp_calldir
,
1170 sizeof(transport
->tcp_calldir
));
1171 transport
->tcp_copied
+= sizeof(transport
->tcp_calldir
);
1172 transport
->tcp_flags
&= ~TCP_RCV_COPY_CALLDIR
;
1176 if (len
> transport
->tcp_reclen
- transport
->tcp_offset
) {
1177 struct xdr_skb_reader my_desc
;
1179 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
1180 memcpy(&my_desc
, desc
, sizeof(my_desc
));
1181 my_desc
.count
= len
;
1182 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
1183 &my_desc
, xdr_skb_read_bits
);
1187 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
1188 desc
, xdr_skb_read_bits
);
1191 transport
->tcp_copied
+= r
;
1192 transport
->tcp_offset
+= r
;
1195 /* Error when copying to the receive buffer,
1196 * usually because we weren't able to allocate
1197 * additional buffer pages. All we can do now
1198 * is turn off TCP_RCV_COPY_DATA, so the request
1199 * will not receive any additional updates,
1201 * Any remaining data from this record will
1204 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1205 dprintk("RPC: XID %08x truncated request\n",
1206 ntohl(transport
->tcp_xid
));
1207 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1208 "tcp_offset = %u, tcp_reclen = %u\n",
1209 xprt
, transport
->tcp_copied
,
1210 transport
->tcp_offset
, transport
->tcp_reclen
);
1214 dprintk("RPC: XID %08x read %Zd bytes\n",
1215 ntohl(transport
->tcp_xid
), r
);
1216 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1217 "tcp_reclen = %u\n", xprt
, transport
->tcp_copied
,
1218 transport
->tcp_offset
, transport
->tcp_reclen
);
1220 if (transport
->tcp_copied
== req
->rq_private_buf
.buflen
)
1221 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1222 else if (transport
->tcp_offset
== transport
->tcp_reclen
) {
1223 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
)
1224 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1229 * Finds the request corresponding to the RPC xid and invokes the common
1230 * tcp read code to read the data.
1232 static inline int xs_tcp_read_reply(struct rpc_xprt
*xprt
,
1233 struct xdr_skb_reader
*desc
)
1235 struct sock_xprt
*transport
=
1236 container_of(xprt
, struct sock_xprt
, xprt
);
1237 struct rpc_rqst
*req
;
1239 dprintk("RPC: read reply XID %08x\n", ntohl(transport
->tcp_xid
));
1241 /* Find and lock the request corresponding to this xid */
1242 spin_lock(&xprt
->transport_lock
);
1243 req
= xprt_lookup_rqst(xprt
, transport
->tcp_xid
);
1245 dprintk("RPC: XID %08x request not found!\n",
1246 ntohl(transport
->tcp_xid
));
1247 spin_unlock(&xprt
->transport_lock
);
1251 xs_tcp_read_common(xprt
, desc
, req
);
1253 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
))
1254 xprt_complete_rqst(req
->rq_task
, transport
->tcp_copied
);
1256 spin_unlock(&xprt
->transport_lock
);
1260 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1262 * Obtains an rpc_rqst previously allocated and invokes the common
1263 * tcp read code to read the data. The result is placed in the callback
1265 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1266 * connection and return -1.
1268 static int xs_tcp_read_callback(struct rpc_xprt
*xprt
,
1269 struct xdr_skb_reader
*desc
)
1271 struct sock_xprt
*transport
=
1272 container_of(xprt
, struct sock_xprt
, xprt
);
1273 struct rpc_rqst
*req
;
1275 /* Look up and lock the request corresponding to the given XID */
1276 spin_lock(&xprt
->transport_lock
);
1277 req
= xprt_lookup_bc_request(xprt
, transport
->tcp_xid
);
1279 spin_unlock(&xprt
->transport_lock
);
1280 printk(KERN_WARNING
"Callback slot table overflowed\n");
1281 xprt_force_disconnect(xprt
);
1285 dprintk("RPC: read callback XID %08x\n", ntohl(req
->rq_xid
));
1286 xs_tcp_read_common(xprt
, desc
, req
);
1288 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
))
1289 xprt_complete_bc_request(req
, transport
->tcp_copied
);
1290 spin_unlock(&xprt
->transport_lock
);
1295 static inline int _xs_tcp_read_data(struct rpc_xprt
*xprt
,
1296 struct xdr_skb_reader
*desc
)
1298 struct sock_xprt
*transport
=
1299 container_of(xprt
, struct sock_xprt
, xprt
);
1301 return (transport
->tcp_flags
& TCP_RPC_REPLY
) ?
1302 xs_tcp_read_reply(xprt
, desc
) :
1303 xs_tcp_read_callback(xprt
, desc
);
1306 static inline int _xs_tcp_read_data(struct rpc_xprt
*xprt
,
1307 struct xdr_skb_reader
*desc
)
1309 return xs_tcp_read_reply(xprt
, desc
);
1311 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1314 * Read data off the transport. This can be either an RPC_CALL or an
1315 * RPC_REPLY. Relay the processing to helper functions.
1317 static void xs_tcp_read_data(struct rpc_xprt
*xprt
,
1318 struct xdr_skb_reader
*desc
)
1320 struct sock_xprt
*transport
=
1321 container_of(xprt
, struct sock_xprt
, xprt
);
1323 if (_xs_tcp_read_data(xprt
, desc
) == 0)
1324 xs_tcp_check_fraghdr(transport
);
1327 * The transport_lock protects the request handling.
1328 * There's no need to hold it to update the tcp_flags.
1330 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1334 static inline void xs_tcp_read_discard(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
1338 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
1339 if (len
> desc
->count
)
1342 desc
->offset
+= len
;
1343 transport
->tcp_offset
+= len
;
1344 dprintk("RPC: discarded %Zu bytes\n", len
);
1345 xs_tcp_check_fraghdr(transport
);
1348 static int xs_tcp_data_recv(read_descriptor_t
*rd_desc
, struct sk_buff
*skb
, unsigned int offset
, size_t len
)
1350 struct rpc_xprt
*xprt
= rd_desc
->arg
.data
;
1351 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1352 struct xdr_skb_reader desc
= {
1358 dprintk("RPC: xs_tcp_data_recv started\n");
1360 trace_xs_tcp_data_recv(transport
);
1361 /* Read in a new fragment marker if necessary */
1362 /* Can we ever really expect to get completely empty fragments? */
1363 if (transport
->tcp_flags
& TCP_RCV_COPY_FRAGHDR
) {
1364 xs_tcp_read_fraghdr(xprt
, &desc
);
1367 /* Read in the xid if necessary */
1368 if (transport
->tcp_flags
& TCP_RCV_COPY_XID
) {
1369 xs_tcp_read_xid(transport
, &desc
);
1372 /* Read in the call/reply flag */
1373 if (transport
->tcp_flags
& TCP_RCV_READ_CALLDIR
) {
1374 xs_tcp_read_calldir(transport
, &desc
);
1377 /* Read in the request data */
1378 if (transport
->tcp_flags
& TCP_RCV_COPY_DATA
) {
1379 xs_tcp_read_data(xprt
, &desc
);
1382 /* Skip over any trailing bytes on short reads */
1383 xs_tcp_read_discard(transport
, &desc
);
1384 } while (desc
.count
);
1385 trace_xs_tcp_data_recv(transport
);
1386 dprintk("RPC: xs_tcp_data_recv done\n");
1387 return len
- desc
.count
;
1391 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1392 * @sk: socket with data to read
1395 static void xs_tcp_data_ready(struct sock
*sk
)
1397 struct rpc_xprt
*xprt
;
1398 read_descriptor_t rd_desc
;
1400 unsigned long total
= 0;
1402 dprintk("RPC: xs_tcp_data_ready...\n");
1404 read_lock_bh(&sk
->sk_callback_lock
);
1405 if (!(xprt
= xprt_from_sock(sk
))) {
1409 /* Any data means we had a useful conversation, so
1410 * the we don't need to delay the next reconnect
1412 if (xprt
->reestablish_timeout
)
1413 xprt
->reestablish_timeout
= 0;
1415 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1416 rd_desc
.arg
.data
= xprt
;
1418 rd_desc
.count
= 65536;
1419 read
= tcp_read_sock(sk
, &rd_desc
, xs_tcp_data_recv
);
1424 trace_xs_tcp_data_ready(xprt
, read
, total
);
1425 read_unlock_bh(&sk
->sk_callback_lock
);
1429 * xs_tcp_state_change - callback to handle TCP socket state changes
1430 * @sk: socket whose state has changed
1433 static void xs_tcp_state_change(struct sock
*sk
)
1435 struct rpc_xprt
*xprt
;
1437 read_lock_bh(&sk
->sk_callback_lock
);
1438 if (!(xprt
= xprt_from_sock(sk
)))
1440 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt
);
1441 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1442 sk
->sk_state
, xprt_connected(xprt
),
1443 sock_flag(sk
, SOCK_DEAD
),
1444 sock_flag(sk
, SOCK_ZAPPED
),
1447 trace_rpc_socket_state_change(xprt
, sk
->sk_socket
);
1448 switch (sk
->sk_state
) {
1449 case TCP_ESTABLISHED
:
1450 spin_lock(&xprt
->transport_lock
);
1451 if (!xprt_test_and_set_connected(xprt
)) {
1452 struct sock_xprt
*transport
= container_of(xprt
,
1453 struct sock_xprt
, xprt
);
1455 /* Reset TCP record info */
1456 transport
->tcp_offset
= 0;
1457 transport
->tcp_reclen
= 0;
1458 transport
->tcp_copied
= 0;
1459 transport
->tcp_flags
=
1460 TCP_RCV_COPY_FRAGHDR
| TCP_RCV_COPY_XID
;
1461 xprt
->connect_cookie
++;
1463 xprt_wake_pending_tasks(xprt
, -EAGAIN
);
1465 spin_unlock(&xprt
->transport_lock
);
1468 /* The client initiated a shutdown of the socket */
1469 xprt
->connect_cookie
++;
1470 xprt
->reestablish_timeout
= 0;
1471 set_bit(XPRT_CLOSING
, &xprt
->state
);
1472 smp_mb__before_atomic();
1473 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1474 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
1475 smp_mb__after_atomic();
1477 case TCP_CLOSE_WAIT
:
1478 /* The server initiated a shutdown of the socket */
1479 xprt
->connect_cookie
++;
1480 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1481 xs_tcp_force_close(xprt
);
1484 * If the server closed down the connection, make sure that
1485 * we back off before reconnecting
1487 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
1488 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
1491 set_bit(XPRT_CLOSING
, &xprt
->state
);
1492 smp_mb__before_atomic();
1493 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1494 smp_mb__after_atomic();
1497 xs_sock_mark_closed(xprt
);
1500 read_unlock_bh(&sk
->sk_callback_lock
);
1503 static void xs_write_space(struct sock
*sk
)
1505 struct socket
*sock
;
1506 struct rpc_xprt
*xprt
;
1508 if (unlikely(!(sock
= sk
->sk_socket
)))
1510 clear_bit(SOCK_NOSPACE
, &sock
->flags
);
1512 if (unlikely(!(xprt
= xprt_from_sock(sk
))))
1514 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE
, &sock
->flags
) == 0)
1517 xprt_write_space(xprt
);
1521 * xs_udp_write_space - callback invoked when socket buffer space
1523 * @sk: socket whose state has changed
1525 * Called when more output buffer space is available for this socket.
1526 * We try not to wake our writers until they can make "significant"
1527 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1528 * with a bunch of small requests.
1530 static void xs_udp_write_space(struct sock
*sk
)
1532 read_lock_bh(&sk
->sk_callback_lock
);
1534 /* from net/core/sock.c:sock_def_write_space */
1535 if (sock_writeable(sk
))
1538 read_unlock_bh(&sk
->sk_callback_lock
);
1542 * xs_tcp_write_space - callback invoked when socket buffer space
1544 * @sk: socket whose state has changed
1546 * Called when more output buffer space is available for this socket.
1547 * We try not to wake our writers until they can make "significant"
1548 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1549 * with a bunch of small requests.
1551 static void xs_tcp_write_space(struct sock
*sk
)
1553 read_lock_bh(&sk
->sk_callback_lock
);
1555 /* from net/core/stream.c:sk_stream_write_space */
1556 if (sk_stream_is_writeable(sk
))
1559 read_unlock_bh(&sk
->sk_callback_lock
);
1562 static void xs_udp_do_set_buffer_size(struct rpc_xprt
*xprt
)
1564 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1565 struct sock
*sk
= transport
->inet
;
1567 if (transport
->rcvsize
) {
1568 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
1569 sk
->sk_rcvbuf
= transport
->rcvsize
* xprt
->max_reqs
* 2;
1571 if (transport
->sndsize
) {
1572 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
1573 sk
->sk_sndbuf
= transport
->sndsize
* xprt
->max_reqs
* 2;
1574 sk
->sk_write_space(sk
);
1579 * xs_udp_set_buffer_size - set send and receive limits
1580 * @xprt: generic transport
1581 * @sndsize: requested size of send buffer, in bytes
1582 * @rcvsize: requested size of receive buffer, in bytes
1584 * Set socket send and receive buffer size limits.
1586 static void xs_udp_set_buffer_size(struct rpc_xprt
*xprt
, size_t sndsize
, size_t rcvsize
)
1588 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1590 transport
->sndsize
= 0;
1592 transport
->sndsize
= sndsize
+ 1024;
1593 transport
->rcvsize
= 0;
1595 transport
->rcvsize
= rcvsize
+ 1024;
1597 xs_udp_do_set_buffer_size(xprt
);
1601 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1602 * @task: task that timed out
1604 * Adjust the congestion window after a retransmit timeout has occurred.
1606 static void xs_udp_timer(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
1608 xprt_adjust_cwnd(xprt
, task
, -ETIMEDOUT
);
1611 static unsigned short xs_get_random_port(void)
1613 unsigned short range
= xprt_max_resvport
- xprt_min_resvport
;
1614 unsigned short rand
= (unsigned short) prandom_u32() % range
;
1615 return rand
+ xprt_min_resvport
;
1619 * xs_set_reuseaddr_port - set the socket's port and address reuse options
1622 * Note that this function has to be called on all sockets that share the
1623 * same port, and it must be called before binding.
1625 static void xs_sock_set_reuseport(struct socket
*sock
)
1629 kernel_setsockopt(sock
, SOL_SOCKET
, SO_REUSEPORT
,
1630 (char *)&opt
, sizeof(opt
));
1633 static unsigned short xs_sock_getport(struct socket
*sock
)
1635 struct sockaddr_storage buf
;
1637 unsigned short port
= 0;
1639 if (kernel_getsockname(sock
, (struct sockaddr
*)&buf
, &buflen
) < 0)
1641 switch (buf
.ss_family
) {
1643 port
= ntohs(((struct sockaddr_in6
*)&buf
)->sin6_port
);
1646 port
= ntohs(((struct sockaddr_in
*)&buf
)->sin_port
);
1653 * xs_set_port - reset the port number in the remote endpoint address
1654 * @xprt: generic transport
1655 * @port: new port number
1658 static void xs_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1660 dprintk("RPC: setting port for xprt %p to %u\n", xprt
, port
);
1662 rpc_set_port(xs_addr(xprt
), port
);
1663 xs_update_peer_port(xprt
);
1666 static void xs_set_srcport(struct sock_xprt
*transport
, struct socket
*sock
)
1668 if (transport
->srcport
== 0)
1669 transport
->srcport
= xs_sock_getport(sock
);
1672 static unsigned short xs_get_srcport(struct sock_xprt
*transport
)
1674 unsigned short port
= transport
->srcport
;
1676 if (port
== 0 && transport
->xprt
.resvport
)
1677 port
= xs_get_random_port();
1681 static unsigned short xs_next_srcport(struct sock_xprt
*transport
, unsigned short port
)
1683 if (transport
->srcport
!= 0)
1684 transport
->srcport
= 0;
1685 if (!transport
->xprt
.resvport
)
1687 if (port
<= xprt_min_resvport
|| port
> xprt_max_resvport
)
1688 return xprt_max_resvport
;
1691 static int xs_bind(struct sock_xprt
*transport
, struct socket
*sock
)
1693 struct sockaddr_storage myaddr
;
1695 unsigned short port
= xs_get_srcport(transport
);
1696 unsigned short last
;
1699 * If we are asking for any ephemeral port (i.e. port == 0 &&
1700 * transport->xprt.resvport == 0), don't bind. Let the local
1701 * port selection happen implicitly when the socket is used
1702 * (for example at connect time).
1704 * This ensures that we can continue to establish TCP
1705 * connections even when all local ephemeral ports are already
1706 * a part of some TCP connection. This makes no difference
1707 * for UDP sockets, but also doens't harm them.
1709 * If we're asking for any reserved port (i.e. port == 0 &&
1710 * transport->xprt.resvport == 1) xs_get_srcport above will
1711 * ensure that port is non-zero and we will bind as needed.
1716 memcpy(&myaddr
, &transport
->srcaddr
, transport
->xprt
.addrlen
);
1718 rpc_set_port((struct sockaddr
*)&myaddr
, port
);
1719 err
= kernel_bind(sock
, (struct sockaddr
*)&myaddr
,
1720 transport
->xprt
.addrlen
);
1722 transport
->srcport
= port
;
1726 port
= xs_next_srcport(transport
, port
);
1729 } while (err
== -EADDRINUSE
&& nloop
!= 2);
1731 if (myaddr
.ss_family
== AF_INET
)
1732 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__
,
1733 &((struct sockaddr_in
*)&myaddr
)->sin_addr
,
1734 port
, err
? "failed" : "ok", err
);
1736 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__
,
1737 &((struct sockaddr_in6
*)&myaddr
)->sin6_addr
,
1738 port
, err
? "failed" : "ok", err
);
1743 * We don't support autobind on AF_LOCAL sockets
1745 static void xs_local_rpcbind(struct rpc_task
*task
)
1748 xprt_set_bound(rcu_dereference(task
->tk_client
->cl_xprt
));
1752 static void xs_local_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1756 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1757 static struct lock_class_key xs_key
[2];
1758 static struct lock_class_key xs_slock_key
[2];
1760 static inline void xs_reclassify_socketu(struct socket
*sock
)
1762 struct sock
*sk
= sock
->sk
;
1764 sock_lock_init_class_and_name(sk
, "slock-AF_LOCAL-RPC",
1765 &xs_slock_key
[1], "sk_lock-AF_LOCAL-RPC", &xs_key
[1]);
1768 static inline void xs_reclassify_socket4(struct socket
*sock
)
1770 struct sock
*sk
= sock
->sk
;
1772 sock_lock_init_class_and_name(sk
, "slock-AF_INET-RPC",
1773 &xs_slock_key
[0], "sk_lock-AF_INET-RPC", &xs_key
[0]);
1776 static inline void xs_reclassify_socket6(struct socket
*sock
)
1778 struct sock
*sk
= sock
->sk
;
1780 sock_lock_init_class_and_name(sk
, "slock-AF_INET6-RPC",
1781 &xs_slock_key
[1], "sk_lock-AF_INET6-RPC", &xs_key
[1]);
1784 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1786 WARN_ON_ONCE(sock_owned_by_user(sock
->sk
));
1787 if (sock_owned_by_user(sock
->sk
))
1792 xs_reclassify_socketu(sock
);
1795 xs_reclassify_socket4(sock
);
1798 xs_reclassify_socket6(sock
);
1803 static inline void xs_reclassify_socketu(struct socket
*sock
)
1807 static inline void xs_reclassify_socket4(struct socket
*sock
)
1811 static inline void xs_reclassify_socket6(struct socket
*sock
)
1815 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1820 static void xs_dummy_setup_socket(struct work_struct
*work
)
1824 static struct socket
*xs_create_sock(struct rpc_xprt
*xprt
,
1825 struct sock_xprt
*transport
, int family
, int type
,
1826 int protocol
, bool reuseport
)
1828 struct socket
*sock
;
1831 err
= __sock_create(xprt
->xprt_net
, family
, type
, protocol
, &sock
, 1);
1833 dprintk("RPC: can't create %d transport socket (%d).\n",
1837 xs_reclassify_socket(family
, sock
);
1840 xs_sock_set_reuseport(sock
);
1842 err
= xs_bind(transport
, sock
);
1850 return ERR_PTR(err
);
1853 static int xs_local_finish_connecting(struct rpc_xprt
*xprt
,
1854 struct socket
*sock
)
1856 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
1859 if (!transport
->inet
) {
1860 struct sock
*sk
= sock
->sk
;
1862 write_lock_bh(&sk
->sk_callback_lock
);
1864 xs_save_old_callbacks(transport
, sk
);
1866 sk
->sk_user_data
= xprt
;
1867 sk
->sk_data_ready
= xs_local_data_ready
;
1868 sk
->sk_write_space
= xs_udp_write_space
;
1869 sk
->sk_error_report
= xs_error_report
;
1870 sk
->sk_allocation
= GFP_ATOMIC
;
1872 xprt_clear_connected(xprt
);
1874 /* Reset to new socket */
1875 transport
->sock
= sock
;
1876 transport
->inet
= sk
;
1878 write_unlock_bh(&sk
->sk_callback_lock
);
1881 /* Tell the socket layer to start connecting... */
1882 xprt
->stat
.connect_count
++;
1883 xprt
->stat
.connect_start
= jiffies
;
1884 return kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, 0);
1888 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1889 * @transport: socket transport to connect
1891 static int xs_local_setup_socket(struct sock_xprt
*transport
)
1893 struct rpc_xprt
*xprt
= &transport
->xprt
;
1894 struct socket
*sock
;
1897 status
= __sock_create(xprt
->xprt_net
, AF_LOCAL
,
1898 SOCK_STREAM
, 0, &sock
, 1);
1900 dprintk("RPC: can't create AF_LOCAL "
1901 "transport socket (%d).\n", -status
);
1904 xs_reclassify_socketu(sock
);
1906 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1907 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1909 status
= xs_local_finish_connecting(xprt
, sock
);
1910 trace_rpc_socket_connect(xprt
, sock
, status
);
1913 dprintk("RPC: xprt %p connected to %s\n",
1914 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1915 xprt_set_connected(xprt
);
1919 dprintk("RPC: xprt %p: socket %s does not exist\n",
1920 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1923 dprintk("RPC: xprt %p: connection refused for %s\n",
1924 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1927 printk(KERN_ERR
"%s: unhandled error (%d) connecting to %s\n",
1929 xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1933 xprt_clear_connecting(xprt
);
1934 xprt_wake_pending_tasks(xprt
, status
);
1938 static void xs_local_connect(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
1940 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1943 if (RPC_IS_ASYNC(task
)) {
1945 * We want the AF_LOCAL connect to be resolved in the
1946 * filesystem namespace of the process making the rpc
1947 * call. Thus we connect synchronously.
1949 * If we want to support asynchronous AF_LOCAL calls,
1950 * we'll need to figure out how to pass a namespace to
1953 rpc_exit(task
, -ENOTCONN
);
1956 ret
= xs_local_setup_socket(transport
);
1957 if (ret
&& !RPC_IS_SOFTCONN(task
))
1958 msleep_interruptible(15000);
1961 #if IS_ENABLED(CONFIG_SUNRPC_SWAP)
1962 static void xs_set_memalloc(struct rpc_xprt
*xprt
)
1964 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
1967 if (atomic_read(&xprt
->swapper
))
1968 sk_set_memalloc(transport
->inet
);
1972 * xs_swapper_enable - Tag this transport as being used for swap.
1973 * @xprt: transport to tag
1975 * Take a reference to this transport on behalf of the rpc_clnt, and
1976 * optionally mark it for swapping if it wasn't already.
1979 xs_swapper_enable(struct rpc_xprt
*xprt
)
1981 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
1984 if (atomic_inc_return(&xprt
->swapper
) == 1)
1985 sk_set_memalloc(transport
->inet
);
1990 * xs_swapper_disable - Untag this transport as being used for swap.
1991 * @xprt: transport to tag
1993 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
1994 * swapper refcount goes to 0, untag the socket as a memalloc socket.
1997 xs_swapper_disable(struct rpc_xprt
*xprt
)
1999 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
2002 if (atomic_dec_and_test(&xprt
->swapper
))
2003 sk_clear_memalloc(transport
->inet
);
2006 static void xs_set_memalloc(struct rpc_xprt
*xprt
)
2011 static void xs_udp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
2013 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2015 if (!transport
->inet
) {
2016 struct sock
*sk
= sock
->sk
;
2018 write_lock_bh(&sk
->sk_callback_lock
);
2020 xs_save_old_callbacks(transport
, sk
);
2022 sk
->sk_user_data
= xprt
;
2023 sk
->sk_data_ready
= xs_udp_data_ready
;
2024 sk
->sk_write_space
= xs_udp_write_space
;
2025 sk
->sk_allocation
= GFP_ATOMIC
;
2027 xprt_set_connected(xprt
);
2029 /* Reset to new socket */
2030 transport
->sock
= sock
;
2031 transport
->inet
= sk
;
2033 xs_set_memalloc(xprt
);
2035 write_unlock_bh(&sk
->sk_callback_lock
);
2037 xs_udp_do_set_buffer_size(xprt
);
2040 static void xs_udp_setup_socket(struct work_struct
*work
)
2042 struct sock_xprt
*transport
=
2043 container_of(work
, struct sock_xprt
, connect_worker
.work
);
2044 struct rpc_xprt
*xprt
= &transport
->xprt
;
2045 struct socket
*sock
= transport
->sock
;
2048 sock
= xs_create_sock(xprt
, transport
,
2049 xs_addr(xprt
)->sa_family
, SOCK_DGRAM
,
2050 IPPROTO_UDP
, false);
2054 dprintk("RPC: worker connecting xprt %p via %s to "
2055 "%s (port %s)\n", xprt
,
2056 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
2057 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2058 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
2060 xs_udp_finish_connecting(xprt
, sock
);
2061 trace_rpc_socket_connect(xprt
, sock
, 0);
2064 xprt_unlock_connect(xprt
, transport
);
2065 xprt_clear_connecting(xprt
);
2066 xprt_wake_pending_tasks(xprt
, status
);
2069 static int xs_tcp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
2071 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2072 int ret
= -ENOTCONN
;
2074 if (!transport
->inet
) {
2075 struct sock
*sk
= sock
->sk
;
2076 unsigned int keepidle
= xprt
->timeout
->to_initval
/ HZ
;
2077 unsigned int keepcnt
= xprt
->timeout
->to_retries
+ 1;
2078 unsigned int opt_on
= 1;
2080 /* TCP Keepalive options */
2081 kernel_setsockopt(sock
, SOL_SOCKET
, SO_KEEPALIVE
,
2082 (char *)&opt_on
, sizeof(opt_on
));
2083 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPIDLE
,
2084 (char *)&keepidle
, sizeof(keepidle
));
2085 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPINTVL
,
2086 (char *)&keepidle
, sizeof(keepidle
));
2087 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPCNT
,
2088 (char *)&keepcnt
, sizeof(keepcnt
));
2090 write_lock_bh(&sk
->sk_callback_lock
);
2092 xs_save_old_callbacks(transport
, sk
);
2094 sk
->sk_user_data
= xprt
;
2095 sk
->sk_data_ready
= xs_tcp_data_ready
;
2096 sk
->sk_state_change
= xs_tcp_state_change
;
2097 sk
->sk_write_space
= xs_tcp_write_space
;
2098 sk
->sk_error_report
= xs_error_report
;
2099 sk
->sk_allocation
= GFP_ATOMIC
;
2101 /* socket options */
2102 sock_reset_flag(sk
, SOCK_LINGER
);
2103 tcp_sk(sk
)->nonagle
|= TCP_NAGLE_OFF
;
2105 xprt_clear_connected(xprt
);
2107 /* Reset to new socket */
2108 transport
->sock
= sock
;
2109 transport
->inet
= sk
;
2111 write_unlock_bh(&sk
->sk_callback_lock
);
2114 if (!xprt_bound(xprt
))
2117 xs_set_memalloc(xprt
);
2119 /* Tell the socket layer to start connecting... */
2120 xprt
->stat
.connect_count
++;
2121 xprt
->stat
.connect_start
= jiffies
;
2122 ret
= kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, O_NONBLOCK
);
2125 xs_set_srcport(transport
, sock
);
2128 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
2129 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2136 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2138 * Invoked by a work queue tasklet.
2140 static void xs_tcp_setup_socket(struct work_struct
*work
)
2142 struct sock_xprt
*transport
=
2143 container_of(work
, struct sock_xprt
, connect_worker
.work
);
2144 struct socket
*sock
= transport
->sock
;
2145 struct rpc_xprt
*xprt
= &transport
->xprt
;
2149 sock
= xs_create_sock(xprt
, transport
,
2150 xs_addr(xprt
)->sa_family
, SOCK_STREAM
,
2153 status
= PTR_ERR(sock
);
2158 dprintk("RPC: worker connecting xprt %p via %s to "
2159 "%s (port %s)\n", xprt
,
2160 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
2161 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2162 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
2164 status
= xs_tcp_finish_connecting(xprt
, sock
);
2165 trace_rpc_socket_connect(xprt
, sock
, status
);
2166 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2167 xprt
, -status
, xprt_connected(xprt
),
2168 sock
->sk
->sk_state
);
2171 printk("%s: connect returned unhandled error %d\n",
2173 case -EADDRNOTAVAIL
:
2174 /* We're probably in TIME_WAIT. Get rid of existing socket,
2177 xs_tcp_force_close(xprt
);
2182 xprt_unlock_connect(xprt
, transport
);
2183 xprt_clear_connecting(xprt
);
2186 /* Happens, for instance, if the user specified a link
2187 * local IPv6 address without a scope-id.
2194 /* retry with existing socket, after a delay */
2195 xs_tcp_force_close(xprt
);
2200 xprt_unlock_connect(xprt
, transport
);
2201 xprt_clear_connecting(xprt
);
2202 xprt_wake_pending_tasks(xprt
, status
);
2206 * xs_connect - connect a socket to a remote endpoint
2207 * @xprt: pointer to transport structure
2208 * @task: address of RPC task that manages state of connect request
2210 * TCP: If the remote end dropped the connection, delay reconnecting.
2212 * UDP socket connects are synchronous, but we use a work queue anyway
2213 * to guarantee that even unprivileged user processes can set up a
2214 * socket on a privileged port.
2216 * If a UDP socket connect fails, the delay behavior here prevents
2217 * retry floods (hard mounts).
2219 static void xs_connect(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
2221 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2223 WARN_ON_ONCE(!xprt_lock_connect(xprt
, task
, transport
));
2225 /* Start by resetting any existing state */
2226 xs_reset_transport(transport
);
2228 if (transport
->sock
!= NULL
&& !RPC_IS_SOFTCONN(task
)) {
2229 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2231 xprt
, xprt
->reestablish_timeout
/ HZ
);
2232 queue_delayed_work(rpciod_workqueue
,
2233 &transport
->connect_worker
,
2234 xprt
->reestablish_timeout
);
2235 xprt
->reestablish_timeout
<<= 1;
2236 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
2237 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2238 if (xprt
->reestablish_timeout
> XS_TCP_MAX_REEST_TO
)
2239 xprt
->reestablish_timeout
= XS_TCP_MAX_REEST_TO
;
2241 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt
);
2242 queue_delayed_work(rpciod_workqueue
,
2243 &transport
->connect_worker
, 0);
2248 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2249 * @xprt: rpc_xprt struct containing statistics
2253 static void xs_local_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2257 if (xprt_connected(xprt
))
2258 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
2260 seq_printf(seq
, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2261 "%llu %llu %lu %llu %llu\n",
2262 xprt
->stat
.bind_count
,
2263 xprt
->stat
.connect_count
,
2264 xprt
->stat
.connect_time
,
2268 xprt
->stat
.bad_xids
,
2271 xprt
->stat
.max_slots
,
2272 xprt
->stat
.sending_u
,
2273 xprt
->stat
.pending_u
);
2277 * xs_udp_print_stats - display UDP socket-specifc stats
2278 * @xprt: rpc_xprt struct containing statistics
2282 static void xs_udp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2284 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2286 seq_printf(seq
, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2289 xprt
->stat
.bind_count
,
2292 xprt
->stat
.bad_xids
,
2295 xprt
->stat
.max_slots
,
2296 xprt
->stat
.sending_u
,
2297 xprt
->stat
.pending_u
);
2301 * xs_tcp_print_stats - display TCP socket-specifc stats
2302 * @xprt: rpc_xprt struct containing statistics
2306 static void xs_tcp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2308 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2311 if (xprt_connected(xprt
))
2312 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
2314 seq_printf(seq
, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2315 "%llu %llu %lu %llu %llu\n",
2317 xprt
->stat
.bind_count
,
2318 xprt
->stat
.connect_count
,
2319 xprt
->stat
.connect_time
,
2323 xprt
->stat
.bad_xids
,
2326 xprt
->stat
.max_slots
,
2327 xprt
->stat
.sending_u
,
2328 xprt
->stat
.pending_u
);
2332 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2333 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2334 * to use the server side send routines.
2336 static void *bc_malloc(struct rpc_task
*task
, size_t size
)
2339 struct rpc_buffer
*buf
;
2341 WARN_ON_ONCE(size
> PAGE_SIZE
- sizeof(struct rpc_buffer
));
2342 if (size
> PAGE_SIZE
- sizeof(struct rpc_buffer
))
2345 page
= alloc_page(GFP_KERNEL
);
2349 buf
= page_address(page
);
2350 buf
->len
= PAGE_SIZE
;
2356 * Free the space allocated in the bc_alloc routine
2358 static void bc_free(void *buffer
)
2360 struct rpc_buffer
*buf
;
2365 buf
= container_of(buffer
, struct rpc_buffer
, data
);
2366 free_page((unsigned long)buf
);
2370 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2371 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2373 static int bc_sendto(struct rpc_rqst
*req
)
2376 struct xdr_buf
*xbufp
= &req
->rq_snd_buf
;
2377 struct rpc_xprt
*xprt
= req
->rq_xprt
;
2378 struct sock_xprt
*transport
=
2379 container_of(xprt
, struct sock_xprt
, xprt
);
2380 struct socket
*sock
= transport
->sock
;
2381 unsigned long headoff
;
2382 unsigned long tailoff
;
2384 xs_encode_stream_record_marker(xbufp
);
2386 tailoff
= (unsigned long)xbufp
->tail
[0].iov_base
& ~PAGE_MASK
;
2387 headoff
= (unsigned long)xbufp
->head
[0].iov_base
& ~PAGE_MASK
;
2388 len
= svc_send_common(sock
, xbufp
,
2389 virt_to_page(xbufp
->head
[0].iov_base
), headoff
,
2390 xbufp
->tail
[0].iov_base
, tailoff
);
2392 if (len
!= xbufp
->len
) {
2393 printk(KERN_NOTICE
"Error sending entire callback!\n");
2401 * The send routine. Borrows from svc_send
2403 static int bc_send_request(struct rpc_task
*task
)
2405 struct rpc_rqst
*req
= task
->tk_rqstp
;
2406 struct svc_xprt
*xprt
;
2409 dprintk("sending request with xid: %08x\n", ntohl(req
->rq_xid
));
2411 * Get the server socket associated with this callback xprt
2413 xprt
= req
->rq_xprt
->bc_xprt
;
2416 * Grab the mutex to serialize data as the connection is shared
2417 * with the fore channel
2419 if (!mutex_trylock(&xprt
->xpt_mutex
)) {
2420 rpc_sleep_on(&xprt
->xpt_bc_pending
, task
, NULL
);
2421 if (!mutex_trylock(&xprt
->xpt_mutex
))
2423 rpc_wake_up_queued_task(&xprt
->xpt_bc_pending
, task
);
2425 if (test_bit(XPT_DEAD
, &xprt
->xpt_flags
))
2428 len
= bc_sendto(req
);
2429 mutex_unlock(&xprt
->xpt_mutex
);
2438 * The close routine. Since this is client initiated, we do nothing
2441 static void bc_close(struct rpc_xprt
*xprt
)
2446 * The xprt destroy routine. Again, because this connection is client
2447 * initiated, we do nothing
2450 static void bc_destroy(struct rpc_xprt
*xprt
)
2452 dprintk("RPC: bc_destroy xprt %p\n", xprt
);
2455 module_put(THIS_MODULE
);
2458 static struct rpc_xprt_ops xs_local_ops
= {
2459 .reserve_xprt
= xprt_reserve_xprt
,
2460 .release_xprt
= xs_tcp_release_xprt
,
2461 .alloc_slot
= xprt_alloc_slot
,
2462 .rpcbind
= xs_local_rpcbind
,
2463 .set_port
= xs_local_set_port
,
2464 .connect
= xs_local_connect
,
2465 .buf_alloc
= rpc_malloc
,
2466 .buf_free
= rpc_free
,
2467 .send_request
= xs_local_send_request
,
2468 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2470 .destroy
= xs_destroy
,
2471 .print_stats
= xs_local_print_stats
,
2474 static struct rpc_xprt_ops xs_udp_ops
= {
2475 .set_buffer_size
= xs_udp_set_buffer_size
,
2476 .reserve_xprt
= xprt_reserve_xprt_cong
,
2477 .release_xprt
= xprt_release_xprt_cong
,
2478 .alloc_slot
= xprt_alloc_slot
,
2479 .rpcbind
= rpcb_getport_async
,
2480 .set_port
= xs_set_port
,
2481 .connect
= xs_connect
,
2482 .buf_alloc
= rpc_malloc
,
2483 .buf_free
= rpc_free
,
2484 .send_request
= xs_udp_send_request
,
2485 .set_retrans_timeout
= xprt_set_retrans_timeout_rtt
,
2486 .timer
= xs_udp_timer
,
2487 .release_request
= xprt_release_rqst_cong
,
2489 .destroy
= xs_destroy
,
2490 .print_stats
= xs_udp_print_stats
,
2493 static struct rpc_xprt_ops xs_tcp_ops
= {
2494 .reserve_xprt
= xprt_reserve_xprt
,
2495 .release_xprt
= xs_tcp_release_xprt
,
2496 .alloc_slot
= xprt_lock_and_alloc_slot
,
2497 .rpcbind
= rpcb_getport_async
,
2498 .set_port
= xs_set_port
,
2499 .connect
= xs_connect
,
2500 .buf_alloc
= rpc_malloc
,
2501 .buf_free
= rpc_free
,
2502 .send_request
= xs_tcp_send_request
,
2503 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2504 .close
= xs_tcp_shutdown
,
2505 .destroy
= xs_destroy
,
2506 .print_stats
= xs_tcp_print_stats
,
2510 * The rpc_xprt_ops for the server backchannel
2513 static struct rpc_xprt_ops bc_tcp_ops
= {
2514 .reserve_xprt
= xprt_reserve_xprt
,
2515 .release_xprt
= xprt_release_xprt
,
2516 .alloc_slot
= xprt_alloc_slot
,
2517 .buf_alloc
= bc_malloc
,
2518 .buf_free
= bc_free
,
2519 .send_request
= bc_send_request
,
2520 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2522 .destroy
= bc_destroy
,
2523 .print_stats
= xs_tcp_print_stats
,
2526 static int xs_init_anyaddr(const int family
, struct sockaddr
*sap
)
2528 static const struct sockaddr_in sin
= {
2529 .sin_family
= AF_INET
,
2530 .sin_addr
.s_addr
= htonl(INADDR_ANY
),
2532 static const struct sockaddr_in6 sin6
= {
2533 .sin6_family
= AF_INET6
,
2534 .sin6_addr
= IN6ADDR_ANY_INIT
,
2541 memcpy(sap
, &sin
, sizeof(sin
));
2544 memcpy(sap
, &sin6
, sizeof(sin6
));
2547 dprintk("RPC: %s: Bad address family\n", __func__
);
2548 return -EAFNOSUPPORT
;
2553 static struct rpc_xprt
*xs_setup_xprt(struct xprt_create
*args
,
2554 unsigned int slot_table_size
,
2555 unsigned int max_slot_table_size
)
2557 struct rpc_xprt
*xprt
;
2558 struct sock_xprt
*new;
2560 if (args
->addrlen
> sizeof(xprt
->addr
)) {
2561 dprintk("RPC: xs_setup_xprt: address too large\n");
2562 return ERR_PTR(-EBADF
);
2565 xprt
= xprt_alloc(args
->net
, sizeof(*new), slot_table_size
,
2566 max_slot_table_size
);
2568 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2570 return ERR_PTR(-ENOMEM
);
2573 new = container_of(xprt
, struct sock_xprt
, xprt
);
2574 memcpy(&xprt
->addr
, args
->dstaddr
, args
->addrlen
);
2575 xprt
->addrlen
= args
->addrlen
;
2577 memcpy(&new->srcaddr
, args
->srcaddr
, args
->addrlen
);
2580 err
= xs_init_anyaddr(args
->dstaddr
->sa_family
,
2581 (struct sockaddr
*)&new->srcaddr
);
2584 return ERR_PTR(err
);
2591 static const struct rpc_timeout xs_local_default_timeout
= {
2592 .to_initval
= 10 * HZ
,
2593 .to_maxval
= 10 * HZ
,
2598 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2599 * @args: rpc transport creation arguments
2601 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2603 static struct rpc_xprt
*xs_setup_local(struct xprt_create
*args
)
2605 struct sockaddr_un
*sun
= (struct sockaddr_un
*)args
->dstaddr
;
2606 struct sock_xprt
*transport
;
2607 struct rpc_xprt
*xprt
;
2608 struct rpc_xprt
*ret
;
2610 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2611 xprt_max_tcp_slot_table_entries
);
2614 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2617 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2618 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2620 xprt
->bind_timeout
= XS_BIND_TO
;
2621 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2622 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2624 xprt
->ops
= &xs_local_ops
;
2625 xprt
->timeout
= &xs_local_default_timeout
;
2627 INIT_DELAYED_WORK(&transport
->connect_worker
,
2628 xs_dummy_setup_socket
);
2630 switch (sun
->sun_family
) {
2632 if (sun
->sun_path
[0] != '/') {
2633 dprintk("RPC: bad AF_LOCAL address: %s\n",
2635 ret
= ERR_PTR(-EINVAL
);
2638 xprt_set_bound(xprt
);
2639 xs_format_peer_addresses(xprt
, "local", RPCBIND_NETID_LOCAL
);
2640 ret
= ERR_PTR(xs_local_setup_socket(transport
));
2645 ret
= ERR_PTR(-EAFNOSUPPORT
);
2649 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2650 xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
2652 if (try_module_get(THIS_MODULE
))
2654 ret
= ERR_PTR(-EINVAL
);
2660 static const struct rpc_timeout xs_udp_default_timeout
= {
2661 .to_initval
= 5 * HZ
,
2662 .to_maxval
= 30 * HZ
,
2663 .to_increment
= 5 * HZ
,
2668 * xs_setup_udp - Set up transport to use a UDP socket
2669 * @args: rpc transport creation arguments
2672 static struct rpc_xprt
*xs_setup_udp(struct xprt_create
*args
)
2674 struct sockaddr
*addr
= args
->dstaddr
;
2675 struct rpc_xprt
*xprt
;
2676 struct sock_xprt
*transport
;
2677 struct rpc_xprt
*ret
;
2679 xprt
= xs_setup_xprt(args
, xprt_udp_slot_table_entries
,
2680 xprt_udp_slot_table_entries
);
2683 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2685 xprt
->prot
= IPPROTO_UDP
;
2687 /* XXX: header size can vary due to auth type, IPv6, etc. */
2688 xprt
->max_payload
= (1U << 16) - (MAX_HEADER
<< 3);
2690 xprt
->bind_timeout
= XS_BIND_TO
;
2691 xprt
->reestablish_timeout
= XS_UDP_REEST_TO
;
2692 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2694 xprt
->ops
= &xs_udp_ops
;
2696 xprt
->timeout
= &xs_udp_default_timeout
;
2698 switch (addr
->sa_family
) {
2700 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2701 xprt_set_bound(xprt
);
2703 INIT_DELAYED_WORK(&transport
->connect_worker
,
2704 xs_udp_setup_socket
);
2705 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP
);
2708 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2709 xprt_set_bound(xprt
);
2711 INIT_DELAYED_WORK(&transport
->connect_worker
,
2712 xs_udp_setup_socket
);
2713 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP6
);
2716 ret
= ERR_PTR(-EAFNOSUPPORT
);
2720 if (xprt_bound(xprt
))
2721 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2722 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2723 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2724 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2726 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2727 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2728 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2730 if (try_module_get(THIS_MODULE
))
2732 ret
= ERR_PTR(-EINVAL
);
2738 static const struct rpc_timeout xs_tcp_default_timeout
= {
2739 .to_initval
= 60 * HZ
,
2740 .to_maxval
= 60 * HZ
,
2745 * xs_setup_tcp - Set up transport to use a TCP socket
2746 * @args: rpc transport creation arguments
2749 static struct rpc_xprt
*xs_setup_tcp(struct xprt_create
*args
)
2751 struct sockaddr
*addr
= args
->dstaddr
;
2752 struct rpc_xprt
*xprt
;
2753 struct sock_xprt
*transport
;
2754 struct rpc_xprt
*ret
;
2755 unsigned int max_slot_table_size
= xprt_max_tcp_slot_table_entries
;
2757 if (args
->flags
& XPRT_CREATE_INFINITE_SLOTS
)
2758 max_slot_table_size
= RPC_MAX_SLOT_TABLE_LIMIT
;
2760 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2761 max_slot_table_size
);
2764 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2766 xprt
->prot
= IPPROTO_TCP
;
2767 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2768 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2770 xprt
->bind_timeout
= XS_BIND_TO
;
2771 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2772 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2774 xprt
->ops
= &xs_tcp_ops
;
2775 xprt
->timeout
= &xs_tcp_default_timeout
;
2777 switch (addr
->sa_family
) {
2779 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2780 xprt_set_bound(xprt
);
2782 INIT_DELAYED_WORK(&transport
->connect_worker
,
2783 xs_tcp_setup_socket
);
2784 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP
);
2787 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2788 xprt_set_bound(xprt
);
2790 INIT_DELAYED_WORK(&transport
->connect_worker
,
2791 xs_tcp_setup_socket
);
2792 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP6
);
2795 ret
= ERR_PTR(-EAFNOSUPPORT
);
2799 if (xprt_bound(xprt
))
2800 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2801 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2802 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2803 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2805 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2806 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2807 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2809 if (try_module_get(THIS_MODULE
))
2811 ret
= ERR_PTR(-EINVAL
);
2818 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2819 * @args: rpc transport creation arguments
2822 static struct rpc_xprt
*xs_setup_bc_tcp(struct xprt_create
*args
)
2824 struct sockaddr
*addr
= args
->dstaddr
;
2825 struct rpc_xprt
*xprt
;
2826 struct sock_xprt
*transport
;
2827 struct svc_sock
*bc_sock
;
2828 struct rpc_xprt
*ret
;
2830 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2831 xprt_tcp_slot_table_entries
);
2834 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2836 xprt
->prot
= IPPROTO_TCP
;
2837 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2838 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2839 xprt
->timeout
= &xs_tcp_default_timeout
;
2842 xprt_set_bound(xprt
);
2843 xprt
->bind_timeout
= 0;
2844 xprt
->reestablish_timeout
= 0;
2845 xprt
->idle_timeout
= 0;
2847 xprt
->ops
= &bc_tcp_ops
;
2849 switch (addr
->sa_family
) {
2851 xs_format_peer_addresses(xprt
, "tcp",
2855 xs_format_peer_addresses(xprt
, "tcp",
2856 RPCBIND_NETID_TCP6
);
2859 ret
= ERR_PTR(-EAFNOSUPPORT
);
2863 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2864 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2865 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2866 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2869 * Once we've associated a backchannel xprt with a connection,
2870 * we want to keep it around as long as the connection lasts,
2871 * in case we need to start using it for a backchannel again;
2872 * this reference won't be dropped until bc_xprt is destroyed.
2875 args
->bc_xprt
->xpt_bc_xprt
= xprt
;
2876 xprt
->bc_xprt
= args
->bc_xprt
;
2877 bc_sock
= container_of(args
->bc_xprt
, struct svc_sock
, sk_xprt
);
2878 transport
->sock
= bc_sock
->sk_sock
;
2879 transport
->inet
= bc_sock
->sk_sk
;
2882 * Since we don't want connections for the backchannel, we set
2883 * the xprt status to connected
2885 xprt_set_connected(xprt
);
2887 if (try_module_get(THIS_MODULE
))
2890 args
->bc_xprt
->xpt_bc_xprt
= NULL
;
2892 ret
= ERR_PTR(-EINVAL
);
2898 static struct xprt_class xs_local_transport
= {
2899 .list
= LIST_HEAD_INIT(xs_local_transport
.list
),
2900 .name
= "named UNIX socket",
2901 .owner
= THIS_MODULE
,
2902 .ident
= XPRT_TRANSPORT_LOCAL
,
2903 .setup
= xs_setup_local
,
2906 static struct xprt_class xs_udp_transport
= {
2907 .list
= LIST_HEAD_INIT(xs_udp_transport
.list
),
2909 .owner
= THIS_MODULE
,
2910 .ident
= XPRT_TRANSPORT_UDP
,
2911 .setup
= xs_setup_udp
,
2914 static struct xprt_class xs_tcp_transport
= {
2915 .list
= LIST_HEAD_INIT(xs_tcp_transport
.list
),
2917 .owner
= THIS_MODULE
,
2918 .ident
= XPRT_TRANSPORT_TCP
,
2919 .setup
= xs_setup_tcp
,
2922 static struct xprt_class xs_bc_tcp_transport
= {
2923 .list
= LIST_HEAD_INIT(xs_bc_tcp_transport
.list
),
2924 .name
= "tcp NFSv4.1 backchannel",
2925 .owner
= THIS_MODULE
,
2926 .ident
= XPRT_TRANSPORT_BC_TCP
,
2927 .setup
= xs_setup_bc_tcp
,
2931 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2934 int init_socket_xprt(void)
2936 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
2937 if (!sunrpc_table_header
)
2938 sunrpc_table_header
= register_sysctl_table(sunrpc_table
);
2941 xprt_register_transport(&xs_local_transport
);
2942 xprt_register_transport(&xs_udp_transport
);
2943 xprt_register_transport(&xs_tcp_transport
);
2944 xprt_register_transport(&xs_bc_tcp_transport
);
2950 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2953 void cleanup_socket_xprt(void)
2955 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
2956 if (sunrpc_table_header
) {
2957 unregister_sysctl_table(sunrpc_table_header
);
2958 sunrpc_table_header
= NULL
;
2962 xprt_unregister_transport(&xs_local_transport
);
2963 xprt_unregister_transport(&xs_udp_transport
);
2964 xprt_unregister_transport(&xs_tcp_transport
);
2965 xprt_unregister_transport(&xs_bc_tcp_transport
);
2968 static int param_set_uint_minmax(const char *val
,
2969 const struct kernel_param
*kp
,
2970 unsigned int min
, unsigned int max
)
2977 ret
= kstrtouint(val
, 0, &num
);
2978 if (ret
== -EINVAL
|| num
< min
|| num
> max
)
2980 *((unsigned int *)kp
->arg
) = num
;
2984 static int param_set_portnr(const char *val
, const struct kernel_param
*kp
)
2986 return param_set_uint_minmax(val
, kp
,
2991 static struct kernel_param_ops param_ops_portnr
= {
2992 .set
= param_set_portnr
,
2993 .get
= param_get_uint
,
2996 #define param_check_portnr(name, p) \
2997 __param_check(name, p, unsigned int);
2999 module_param_named(min_resvport
, xprt_min_resvport
, portnr
, 0644);
3000 module_param_named(max_resvport
, xprt_max_resvport
, portnr
, 0644);
3002 static int param_set_slot_table_size(const char *val
,
3003 const struct kernel_param
*kp
)
3005 return param_set_uint_minmax(val
, kp
,
3007 RPC_MAX_SLOT_TABLE
);
3010 static struct kernel_param_ops param_ops_slot_table_size
= {
3011 .set
= param_set_slot_table_size
,
3012 .get
= param_get_uint
,
3015 #define param_check_slot_table_size(name, p) \
3016 __param_check(name, p, unsigned int);
3018 static int param_set_max_slot_table_size(const char *val
,
3019 const struct kernel_param
*kp
)
3021 return param_set_uint_minmax(val
, kp
,
3023 RPC_MAX_SLOT_TABLE_LIMIT
);
3026 static struct kernel_param_ops param_ops_max_slot_table_size
= {
3027 .set
= param_set_max_slot_table_size
,
3028 .get
= param_get_uint
,
3031 #define param_check_max_slot_table_size(name, p) \
3032 __param_check(name, p, unsigned int);
3034 module_param_named(tcp_slot_table_entries
, xprt_tcp_slot_table_entries
,
3035 slot_table_size
, 0644);
3036 module_param_named(tcp_max_slot_table_entries
, xprt_max_tcp_slot_table_entries
,
3037 max_slot_table_size
, 0644);
3038 module_param_named(udp_slot_table_entries
, xprt_udp_slot_table_entries
,
3039 slot_table_size
, 0644);