2 * linux/net/sunrpc/xprtsock.c
4 * Client-side transport implementation for sockets.
6 * TCP callback races fixes (C) 1998 Red Hat Software <alan@redhat.com>
7 * TCP send fixes (C) 1998 Red Hat Software <alan@redhat.com>
8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
18 #include <linux/types.h>
19 #include <linux/slab.h>
20 #include <linux/capability.h>
21 #include <linux/pagemap.h>
22 #include <linux/errno.h>
23 #include <linux/socket.h>
25 #include <linux/net.h>
27 #include <linux/udp.h>
28 #include <linux/tcp.h>
29 #include <linux/sunrpc/clnt.h>
30 #include <linux/sunrpc/sched.h>
31 #include <linux/file.h>
34 #include <net/checksum.h>
41 unsigned int xprt_udp_slot_table_entries
= RPC_DEF_SLOT_TABLE
;
42 unsigned int xprt_tcp_slot_table_entries
= RPC_DEF_SLOT_TABLE
;
44 unsigned int xprt_min_resvport
= RPC_DEF_MIN_RESVPORT
;
45 unsigned int xprt_max_resvport
= RPC_DEF_MAX_RESVPORT
;
48 * We can register our own files under /proc/sys/sunrpc by
49 * calling register_sysctl_table() again. The files in that
50 * directory become the union of all files registered there.
52 * We simply need to make sure that we don't collide with
53 * someone else's file names!
58 static unsigned int min_slot_table_size
= RPC_MIN_SLOT_TABLE
;
59 static unsigned int max_slot_table_size
= RPC_MAX_SLOT_TABLE
;
60 static unsigned int xprt_min_resvport_limit
= RPC_MIN_RESVPORT
;
61 static unsigned int xprt_max_resvport_limit
= RPC_MAX_RESVPORT
;
63 static struct ctl_table_header
*sunrpc_table_header
;
66 * FIXME: changing the UDP slot table size should also resize the UDP
67 * socket buffers for existing UDP transports
69 static ctl_table xs_tunables_table
[] = {
71 .ctl_name
= CTL_SLOTTABLE_UDP
,
72 .procname
= "udp_slot_table_entries",
73 .data
= &xprt_udp_slot_table_entries
,
74 .maxlen
= sizeof(unsigned int),
76 .proc_handler
= &proc_dointvec_minmax
,
77 .strategy
= &sysctl_intvec
,
78 .extra1
= &min_slot_table_size
,
79 .extra2
= &max_slot_table_size
82 .ctl_name
= CTL_SLOTTABLE_TCP
,
83 .procname
= "tcp_slot_table_entries",
84 .data
= &xprt_tcp_slot_table_entries
,
85 .maxlen
= sizeof(unsigned int),
87 .proc_handler
= &proc_dointvec_minmax
,
88 .strategy
= &sysctl_intvec
,
89 .extra1
= &min_slot_table_size
,
90 .extra2
= &max_slot_table_size
93 .ctl_name
= CTL_MIN_RESVPORT
,
94 .procname
= "min_resvport",
95 .data
= &xprt_min_resvport
,
96 .maxlen
= sizeof(unsigned int),
98 .proc_handler
= &proc_dointvec_minmax
,
99 .strategy
= &sysctl_intvec
,
100 .extra1
= &xprt_min_resvport_limit
,
101 .extra2
= &xprt_max_resvport_limit
104 .ctl_name
= CTL_MAX_RESVPORT
,
105 .procname
= "max_resvport",
106 .data
= &xprt_max_resvport
,
107 .maxlen
= sizeof(unsigned int),
109 .proc_handler
= &proc_dointvec_minmax
,
110 .strategy
= &sysctl_intvec
,
111 .extra1
= &xprt_min_resvport_limit
,
112 .extra2
= &xprt_max_resvport_limit
119 static ctl_table sunrpc_table
[] = {
121 .ctl_name
= CTL_SUNRPC
,
122 .procname
= "sunrpc",
124 .child
= xs_tunables_table
134 * How many times to try sending a request on a socket before waiting
135 * for the socket buffer to clear.
137 #define XS_SENDMSG_RETRY (10U)
140 * Time out for an RPC UDP socket connect. UDP socket connects are
141 * synchronous, but we set a timeout anyway in case of resource
142 * exhaustion on the local host.
144 #define XS_UDP_CONN_TO (5U * HZ)
147 * Wait duration for an RPC TCP connection to be established. Solaris
148 * NFS over TCP uses 60 seconds, for example, which is in line with how
149 * long a server takes to reboot.
151 #define XS_TCP_CONN_TO (60U * HZ)
154 * Wait duration for a reply from the RPC portmapper.
156 #define XS_BIND_TO (60U * HZ)
159 * Delay if a UDP socket connect error occurs. This is most likely some
160 * kind of resource problem on the local host.
162 #define XS_UDP_REEST_TO (2U * HZ)
165 * The reestablish timeout allows clients to delay for a bit before attempting
166 * to reconnect to a server that just dropped our connection.
168 * We implement an exponential backoff when trying to reestablish a TCP
169 * transport connection with the server. Some servers like to drop a TCP
170 * connection when they are overworked, so we start with a short timeout and
171 * increase over time if the server is down or not responding.
173 #define XS_TCP_INIT_REEST_TO (3U * HZ)
174 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
177 * TCP idle timeout; client drops the transport socket if it is idle
178 * for this long. Note that we also timeout UDP sockets to prevent
179 * holding port numbers when there is no RPC traffic.
181 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
184 # undef RPC_DEBUG_DATA
185 # define RPCDBG_FACILITY RPCDBG_TRANS
188 #ifdef RPC_DEBUG_DATA
189 static void xs_pktdump(char *msg
, u32
*packet
, unsigned int count
)
191 u8
*buf
= (u8
*) packet
;
194 dprintk("RPC: %s\n", msg
);
195 for (j
= 0; j
< count
&& j
< 128; j
+= 4) {
199 dprintk("0x%04x ", j
);
201 dprintk("%02x%02x%02x%02x ",
202 buf
[j
], buf
[j
+1], buf
[j
+2], buf
[j
+3]);
207 static inline void xs_pktdump(char *msg
, u32
*packet
, unsigned int count
)
214 struct rpc_xprt xprt
;
219 struct socket
* sock
;
223 * State of TCP reply receive
231 unsigned long tcp_copied
,
235 * Connection of transports
237 struct delayed_work connect_worker
;
238 struct sockaddr_storage addr
;
242 * UDP socket buffer size parameters
248 * Saved socket callback addresses
250 void (*old_data_ready
)(struct sock
*, int);
251 void (*old_state_change
)(struct sock
*);
252 void (*old_write_space
)(struct sock
*);
256 * TCP receive state flags
258 #define TCP_RCV_LAST_FRAG (1UL << 0)
259 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
260 #define TCP_RCV_COPY_XID (1UL << 2)
261 #define TCP_RCV_COPY_DATA (1UL << 3)
263 static void xs_format_ipv4_peer_addresses(struct rpc_xprt
*xprt
)
265 struct sockaddr_in
*addr
= (struct sockaddr_in
*) &xprt
->addr
;
268 buf
= kzalloc(20, GFP_KERNEL
);
270 snprintf(buf
, 20, NIPQUAD_FMT
,
271 NIPQUAD(addr
->sin_addr
.s_addr
));
273 xprt
->address_strings
[RPC_DISPLAY_ADDR
] = buf
;
275 buf
= kzalloc(8, GFP_KERNEL
);
277 snprintf(buf
, 8, "%u",
278 ntohs(addr
->sin_port
));
280 xprt
->address_strings
[RPC_DISPLAY_PORT
] = buf
;
282 buf
= kzalloc(8, GFP_KERNEL
);
284 if (xprt
->prot
== IPPROTO_UDP
)
285 snprintf(buf
, 8, "udp");
287 snprintf(buf
, 8, "tcp");
289 xprt
->address_strings
[RPC_DISPLAY_PROTO
] = buf
;
291 buf
= kzalloc(48, GFP_KERNEL
);
293 snprintf(buf
, 48, "addr="NIPQUAD_FMT
" port=%u proto=%s",
294 NIPQUAD(addr
->sin_addr
.s_addr
),
295 ntohs(addr
->sin_port
),
296 xprt
->prot
== IPPROTO_UDP
? "udp" : "tcp");
298 xprt
->address_strings
[RPC_DISPLAY_ALL
] = buf
;
300 buf
= kzalloc(10, GFP_KERNEL
);
302 snprintf(buf
, 10, "%02x%02x%02x%02x",
303 NIPQUAD(addr
->sin_addr
.s_addr
));
305 xprt
->address_strings
[RPC_DISPLAY_HEX_ADDR
] = buf
;
307 buf
= kzalloc(8, GFP_KERNEL
);
309 snprintf(buf
, 8, "%4hx",
310 ntohs(addr
->sin_port
));
312 xprt
->address_strings
[RPC_DISPLAY_HEX_PORT
] = buf
;
315 static void xs_format_ipv6_peer_addresses(struct rpc_xprt
*xprt
)
317 struct sockaddr_in6
*addr
= (struct sockaddr_in6
*) &xprt
->addr
;
320 buf
= kzalloc(40, GFP_KERNEL
);
322 snprintf(buf
, 40, NIP6_FMT
,
323 NIP6(addr
->sin6_addr
));
325 xprt
->address_strings
[RPC_DISPLAY_ADDR
] = buf
;
327 buf
= kzalloc(8, GFP_KERNEL
);
329 snprintf(buf
, 8, "%u",
330 ntohs(addr
->sin6_port
));
332 xprt
->address_strings
[RPC_DISPLAY_PORT
] = buf
;
334 buf
= kzalloc(8, GFP_KERNEL
);
336 if (xprt
->prot
== IPPROTO_UDP
)
337 snprintf(buf
, 8, "udp");
339 snprintf(buf
, 8, "tcp");
341 xprt
->address_strings
[RPC_DISPLAY_PROTO
] = buf
;
343 buf
= kzalloc(64, GFP_KERNEL
);
345 snprintf(buf
, 64, "addr="NIP6_FMT
" port=%u proto=%s",
346 NIP6(addr
->sin6_addr
),
347 ntohs(addr
->sin6_port
),
348 xprt
->prot
== IPPROTO_UDP
? "udp" : "tcp");
350 xprt
->address_strings
[RPC_DISPLAY_ALL
] = buf
;
352 buf
= kzalloc(36, GFP_KERNEL
);
354 snprintf(buf
, 36, NIP6_SEQFMT
,
355 NIP6(addr
->sin6_addr
));
357 xprt
->address_strings
[RPC_DISPLAY_HEX_ADDR
] = buf
;
359 buf
= kzalloc(8, GFP_KERNEL
);
361 snprintf(buf
, 8, "%4hx",
362 ntohs(addr
->sin6_port
));
364 xprt
->address_strings
[RPC_DISPLAY_HEX_PORT
] = buf
;
367 static void xs_free_peer_addresses(struct rpc_xprt
*xprt
)
371 for (i
= 0; i
< RPC_DISPLAY_MAX
; i
++)
372 kfree(xprt
->address_strings
[i
]);
375 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
377 static int xs_send_kvec(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
, struct kvec
*vec
, unsigned int base
, int more
)
379 struct msghdr msg
= {
381 .msg_namelen
= addrlen
,
382 .msg_flags
= XS_SENDMSG_FLAGS
| (more
? MSG_MORE
: 0),
385 .iov_base
= vec
->iov_base
+ base
,
386 .iov_len
= vec
->iov_len
- base
,
389 if (iov
.iov_len
!= 0)
390 return kernel_sendmsg(sock
, &msg
, &iov
, 1, iov
.iov_len
);
391 return kernel_sendmsg(sock
, &msg
, NULL
, 0, 0);
394 static int xs_send_pagedata(struct socket
*sock
, struct xdr_buf
*xdr
, unsigned int base
, int more
)
397 unsigned int remainder
;
400 remainder
= xdr
->page_len
- base
;
401 base
+= xdr
->page_base
;
402 ppage
= xdr
->pages
+ (base
>> PAGE_SHIFT
);
405 unsigned int len
= min_t(unsigned int, PAGE_SIZE
- base
, remainder
);
406 int flags
= XS_SENDMSG_FLAGS
;
409 if (remainder
!= 0 || more
)
411 err
= sock
->ops
->sendpage(sock
, *ppage
, base
, len
, flags
);
412 if (remainder
== 0 || err
!= len
)
426 * xs_sendpages - write pages directly to a socket
427 * @sock: socket to send on
428 * @addr: UDP only -- address of destination
429 * @addrlen: UDP only -- length of destination address
430 * @xdr: buffer containing this request
431 * @base: starting position in the buffer
434 static int xs_sendpages(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
, struct xdr_buf
*xdr
, unsigned int base
)
436 unsigned int remainder
= xdr
->len
- base
;
442 clear_bit(SOCK_ASYNC_NOSPACE
, &sock
->flags
);
448 if (base
< xdr
->head
[0].iov_len
|| addr
!= NULL
) {
449 unsigned int len
= xdr
->head
[0].iov_len
- base
;
451 err
= xs_send_kvec(sock
, addr
, addrlen
, &xdr
->head
[0], base
, remainder
!= 0);
452 if (remainder
== 0 || err
!= len
)
457 base
-= xdr
->head
[0].iov_len
;
459 if (base
< xdr
->page_len
) {
460 unsigned int len
= xdr
->page_len
- base
;
462 err
= xs_send_pagedata(sock
, xdr
, base
, remainder
!= 0);
463 if (remainder
== 0 || err
!= len
)
468 base
-= xdr
->page_len
;
470 if (base
>= xdr
->tail
[0].iov_len
)
472 err
= xs_send_kvec(sock
, NULL
, 0, &xdr
->tail
[0], base
, 0);
482 * xs_nospace - place task on wait queue if transmit was incomplete
483 * @task: task to put to sleep
486 static void xs_nospace(struct rpc_task
*task
)
488 struct rpc_rqst
*req
= task
->tk_rqstp
;
489 struct rpc_xprt
*xprt
= req
->rq_xprt
;
490 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
492 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
493 task
->tk_pid
, req
->rq_slen
- req
->rq_bytes_sent
,
496 if (test_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
)) {
497 /* Protect against races with write_space */
498 spin_lock_bh(&xprt
->transport_lock
);
500 /* Don't race with disconnect */
501 if (!xprt_connected(xprt
))
502 task
->tk_status
= -ENOTCONN
;
503 else if (test_bit(SOCK_NOSPACE
, &transport
->sock
->flags
))
504 xprt_wait_for_buffer_space(task
);
506 spin_unlock_bh(&xprt
->transport_lock
);
508 /* Keep holding the socket if it is blocked */
509 rpc_delay(task
, HZ
>>4);
513 * xs_udp_send_request - write an RPC request to a UDP socket
514 * @task: address of RPC task that manages the state of an RPC request
517 * 0: The request has been sent
518 * EAGAIN: The socket was blocked, please call again later to
519 * complete the request
520 * ENOTCONN: Caller needs to invoke connect logic then call again
521 * other: Some other error occured, the request was not sent
523 static int xs_udp_send_request(struct rpc_task
*task
)
525 struct rpc_rqst
*req
= task
->tk_rqstp
;
526 struct rpc_xprt
*xprt
= req
->rq_xprt
;
527 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
528 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
531 xs_pktdump("packet data:",
532 req
->rq_svec
->iov_base
,
533 req
->rq_svec
->iov_len
);
535 req
->rq_xtime
= jiffies
;
536 status
= xs_sendpages(transport
->sock
,
537 (struct sockaddr
*) &xprt
->addr
,
541 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
542 xdr
->len
- req
->rq_bytes_sent
, status
);
544 if (likely(status
>= (int) req
->rq_slen
))
547 /* Still some bytes left; set up for a retry later. */
555 /* When the server has died, an ICMP port unreachable message
556 * prompts ECONNREFUSED. */
562 dprintk("RPC: sendmsg returned unrecognized error %d\n",
570 static inline void xs_encode_tcp_record_marker(struct xdr_buf
*buf
)
572 u32 reclen
= buf
->len
- sizeof(rpc_fraghdr
);
573 rpc_fraghdr
*base
= buf
->head
[0].iov_base
;
574 *base
= htonl(RPC_LAST_STREAM_FRAGMENT
| reclen
);
578 * xs_tcp_send_request - write an RPC request to a TCP socket
579 * @task: address of RPC task that manages the state of an RPC request
582 * 0: The request has been sent
583 * EAGAIN: The socket was blocked, please call again later to
584 * complete the request
585 * ENOTCONN: Caller needs to invoke connect logic then call again
586 * other: Some other error occured, the request was not sent
588 * XXX: In the case of soft timeouts, should we eventually give up
589 * if sendmsg is not able to make progress?
591 static int xs_tcp_send_request(struct rpc_task
*task
)
593 struct rpc_rqst
*req
= task
->tk_rqstp
;
594 struct rpc_xprt
*xprt
= req
->rq_xprt
;
595 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
596 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
598 unsigned int retry
= 0;
600 xs_encode_tcp_record_marker(&req
->rq_snd_buf
);
602 xs_pktdump("packet data:",
603 req
->rq_svec
->iov_base
,
604 req
->rq_svec
->iov_len
);
606 /* Continue transmitting the packet/record. We must be careful
607 * to cope with writespace callbacks arriving _after_ we have
608 * called sendmsg(). */
610 req
->rq_xtime
= jiffies
;
611 status
= xs_sendpages(transport
->sock
,
612 NULL
, 0, xdr
, req
->rq_bytes_sent
);
614 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
615 xdr
->len
- req
->rq_bytes_sent
, status
);
617 if (unlikely(status
< 0))
620 /* If we've sent the entire packet, immediately
621 * reset the count of bytes sent. */
622 req
->rq_bytes_sent
+= status
;
623 task
->tk_bytes_sent
+= status
;
624 if (likely(req
->rq_bytes_sent
>= req
->rq_slen
)) {
625 req
->rq_bytes_sent
= 0;
630 if (retry
++ > XS_SENDMSG_RETRY
)
645 dprintk("RPC: sendmsg returned unrecognized error %d\n",
647 xprt_disconnect(xprt
);
655 * xs_tcp_release_xprt - clean up after a tcp transmission
659 * This cleans up if an error causes us to abort the transmission of a request.
660 * In this case, the socket may need to be reset in order to avoid confusing
663 static void xs_tcp_release_xprt(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
665 struct rpc_rqst
*req
;
667 if (task
!= xprt
->snd_task
)
671 req
= task
->tk_rqstp
;
672 if (req
->rq_bytes_sent
== 0)
674 if (req
->rq_bytes_sent
== req
->rq_snd_buf
.len
)
676 set_bit(XPRT_CLOSE_WAIT
, &task
->tk_xprt
->state
);
678 xprt_release_xprt(xprt
, task
);
682 * xs_close - close a socket
685 * This is used when all requests are complete; ie, no DRC state remains
686 * on the server we want to save.
688 static void xs_close(struct rpc_xprt
*xprt
)
690 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
691 struct socket
*sock
= transport
->sock
;
692 struct sock
*sk
= transport
->inet
;
695 goto clear_close_wait
;
697 dprintk("RPC: xs_close xprt %p\n", xprt
);
699 write_lock_bh(&sk
->sk_callback_lock
);
700 transport
->inet
= NULL
;
701 transport
->sock
= NULL
;
703 sk
->sk_user_data
= NULL
;
704 sk
->sk_data_ready
= transport
->old_data_ready
;
705 sk
->sk_state_change
= transport
->old_state_change
;
706 sk
->sk_write_space
= transport
->old_write_space
;
707 write_unlock_bh(&sk
->sk_callback_lock
);
713 smp_mb__before_clear_bit();
714 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
715 smp_mb__after_clear_bit();
719 * xs_destroy - prepare to shutdown a transport
720 * @xprt: doomed transport
723 static void xs_destroy(struct rpc_xprt
*xprt
)
725 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
727 dprintk("RPC: xs_destroy xprt %p\n", xprt
);
729 cancel_rearming_delayed_work(&transport
->connect_worker
);
731 xprt_disconnect(xprt
);
733 xs_free_peer_addresses(xprt
);
738 static inline struct rpc_xprt
*xprt_from_sock(struct sock
*sk
)
740 return (struct rpc_xprt
*) sk
->sk_user_data
;
744 * xs_udp_data_ready - "data ready" callback for UDP sockets
745 * @sk: socket with data to read
746 * @len: how much data to read
749 static void xs_udp_data_ready(struct sock
*sk
, int len
)
751 struct rpc_task
*task
;
752 struct rpc_xprt
*xprt
;
753 struct rpc_rqst
*rovr
;
755 int err
, repsize
, copied
;
759 read_lock(&sk
->sk_callback_lock
);
760 dprintk("RPC: xs_udp_data_ready...\n");
761 if (!(xprt
= xprt_from_sock(sk
)))
764 if ((skb
= skb_recv_datagram(sk
, 0, 1, &err
)) == NULL
)
770 repsize
= skb
->len
- sizeof(struct udphdr
);
772 dprintk("RPC: impossible RPC reply size %d!\n", repsize
);
776 /* Copy the XID from the skb... */
777 xp
= skb_header_pointer(skb
, sizeof(struct udphdr
),
778 sizeof(_xid
), &_xid
);
782 /* Look up and lock the request corresponding to the given XID */
783 spin_lock(&xprt
->transport_lock
);
784 rovr
= xprt_lookup_rqst(xprt
, *xp
);
787 task
= rovr
->rq_task
;
789 if ((copied
= rovr
->rq_private_buf
.buflen
) > repsize
)
792 /* Suck it into the iovec, verify checksum if not done by hw. */
793 if (csum_partial_copy_to_xdr(&rovr
->rq_private_buf
, skb
))
796 /* Something worked... */
797 dst_confirm(skb
->dst
);
799 xprt_adjust_cwnd(task
, copied
);
800 xprt_update_rtt(task
);
801 xprt_complete_rqst(task
, copied
);
804 spin_unlock(&xprt
->transport_lock
);
806 skb_free_datagram(sk
, skb
);
808 read_unlock(&sk
->sk_callback_lock
);
811 static inline void xs_tcp_read_fraghdr(struct rpc_xprt
*xprt
, struct xdr_skb_reader
*desc
)
813 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
817 p
= ((char *) &transport
->tcp_fraghdr
) + transport
->tcp_offset
;
818 len
= sizeof(transport
->tcp_fraghdr
) - transport
->tcp_offset
;
819 used
= xdr_skb_read_bits(desc
, p
, len
);
820 transport
->tcp_offset
+= used
;
824 transport
->tcp_reclen
= ntohl(transport
->tcp_fraghdr
);
825 if (transport
->tcp_reclen
& RPC_LAST_STREAM_FRAGMENT
)
826 transport
->tcp_flags
|= TCP_RCV_LAST_FRAG
;
828 transport
->tcp_flags
&= ~TCP_RCV_LAST_FRAG
;
829 transport
->tcp_reclen
&= RPC_FRAGMENT_SIZE_MASK
;
831 transport
->tcp_flags
&= ~TCP_RCV_COPY_FRAGHDR
;
832 transport
->tcp_offset
= 0;
834 /* Sanity check of the record length */
835 if (unlikely(transport
->tcp_reclen
< 4)) {
836 dprintk("RPC: invalid TCP record fragment length\n");
837 xprt_disconnect(xprt
);
840 dprintk("RPC: reading TCP record fragment of length %d\n",
841 transport
->tcp_reclen
);
844 static void xs_tcp_check_fraghdr(struct sock_xprt
*transport
)
846 if (transport
->tcp_offset
== transport
->tcp_reclen
) {
847 transport
->tcp_flags
|= TCP_RCV_COPY_FRAGHDR
;
848 transport
->tcp_offset
= 0;
849 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
) {
850 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
851 transport
->tcp_flags
|= TCP_RCV_COPY_XID
;
852 transport
->tcp_copied
= 0;
857 static inline void xs_tcp_read_xid(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
862 len
= sizeof(transport
->tcp_xid
) - transport
->tcp_offset
;
863 dprintk("RPC: reading XID (%Zu bytes)\n", len
);
864 p
= ((char *) &transport
->tcp_xid
) + transport
->tcp_offset
;
865 used
= xdr_skb_read_bits(desc
, p
, len
);
866 transport
->tcp_offset
+= used
;
869 transport
->tcp_flags
&= ~TCP_RCV_COPY_XID
;
870 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
871 transport
->tcp_copied
= 4;
872 dprintk("RPC: reading reply for XID %08x\n",
873 ntohl(transport
->tcp_xid
));
874 xs_tcp_check_fraghdr(transport
);
877 static inline void xs_tcp_read_request(struct rpc_xprt
*xprt
, struct xdr_skb_reader
*desc
)
879 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
880 struct rpc_rqst
*req
;
881 struct xdr_buf
*rcvbuf
;
885 /* Find and lock the request corresponding to this xid */
886 spin_lock(&xprt
->transport_lock
);
887 req
= xprt_lookup_rqst(xprt
, transport
->tcp_xid
);
889 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
890 dprintk("RPC: XID %08x request not found!\n",
891 ntohl(transport
->tcp_xid
));
892 spin_unlock(&xprt
->transport_lock
);
896 rcvbuf
= &req
->rq_private_buf
;
898 if (len
> transport
->tcp_reclen
- transport
->tcp_offset
) {
899 struct xdr_skb_reader my_desc
;
901 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
902 memcpy(&my_desc
, desc
, sizeof(my_desc
));
904 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
905 &my_desc
, xdr_skb_read_bits
);
909 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
910 desc
, xdr_skb_read_bits
);
913 transport
->tcp_copied
+= r
;
914 transport
->tcp_offset
+= r
;
917 /* Error when copying to the receive buffer,
918 * usually because we weren't able to allocate
919 * additional buffer pages. All we can do now
920 * is turn off TCP_RCV_COPY_DATA, so the request
921 * will not receive any additional updates,
923 * Any remaining data from this record will
926 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
927 dprintk("RPC: XID %08x truncated request\n",
928 ntohl(transport
->tcp_xid
));
929 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
930 "tcp_offset = %u, tcp_reclen = %u\n",
931 xprt
, transport
->tcp_copied
,
932 transport
->tcp_offset
, transport
->tcp_reclen
);
936 dprintk("RPC: XID %08x read %Zd bytes\n",
937 ntohl(transport
->tcp_xid
), r
);
938 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
939 "tcp_reclen = %u\n", xprt
, transport
->tcp_copied
,
940 transport
->tcp_offset
, transport
->tcp_reclen
);
942 if (transport
->tcp_copied
== req
->rq_private_buf
.buflen
)
943 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
944 else if (transport
->tcp_offset
== transport
->tcp_reclen
) {
945 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
)
946 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
950 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
))
951 xprt_complete_rqst(req
->rq_task
, transport
->tcp_copied
);
952 spin_unlock(&xprt
->transport_lock
);
953 xs_tcp_check_fraghdr(transport
);
956 static inline void xs_tcp_read_discard(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
960 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
961 if (len
> desc
->count
)
965 transport
->tcp_offset
+= len
;
966 dprintk("RPC: discarded %Zu bytes\n", len
);
967 xs_tcp_check_fraghdr(transport
);
970 static int xs_tcp_data_recv(read_descriptor_t
*rd_desc
, struct sk_buff
*skb
, unsigned int offset
, size_t len
)
972 struct rpc_xprt
*xprt
= rd_desc
->arg
.data
;
973 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
974 struct xdr_skb_reader desc
= {
980 dprintk("RPC: xs_tcp_data_recv started\n");
982 /* Read in a new fragment marker if necessary */
983 /* Can we ever really expect to get completely empty fragments? */
984 if (transport
->tcp_flags
& TCP_RCV_COPY_FRAGHDR
) {
985 xs_tcp_read_fraghdr(xprt
, &desc
);
988 /* Read in the xid if necessary */
989 if (transport
->tcp_flags
& TCP_RCV_COPY_XID
) {
990 xs_tcp_read_xid(transport
, &desc
);
993 /* Read in the request data */
994 if (transport
->tcp_flags
& TCP_RCV_COPY_DATA
) {
995 xs_tcp_read_request(xprt
, &desc
);
998 /* Skip over any trailing bytes on short reads */
999 xs_tcp_read_discard(transport
, &desc
);
1000 } while (desc
.count
);
1001 dprintk("RPC: xs_tcp_data_recv done\n");
1002 return len
- desc
.count
;
1006 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1007 * @sk: socket with data to read
1008 * @bytes: how much data to read
1011 static void xs_tcp_data_ready(struct sock
*sk
, int bytes
)
1013 struct rpc_xprt
*xprt
;
1014 read_descriptor_t rd_desc
;
1016 dprintk("RPC: xs_tcp_data_ready...\n");
1018 read_lock(&sk
->sk_callback_lock
);
1019 if (!(xprt
= xprt_from_sock(sk
)))
1024 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1025 rd_desc
.arg
.data
= xprt
;
1026 rd_desc
.count
= 65536;
1027 tcp_read_sock(sk
, &rd_desc
, xs_tcp_data_recv
);
1029 read_unlock(&sk
->sk_callback_lock
);
1033 * xs_tcp_state_change - callback to handle TCP socket state changes
1034 * @sk: socket whose state has changed
1037 static void xs_tcp_state_change(struct sock
*sk
)
1039 struct rpc_xprt
*xprt
;
1041 read_lock(&sk
->sk_callback_lock
);
1042 if (!(xprt
= xprt_from_sock(sk
)))
1044 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt
);
1045 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1046 sk
->sk_state
, xprt_connected(xprt
),
1047 sock_flag(sk
, SOCK_DEAD
),
1048 sock_flag(sk
, SOCK_ZAPPED
));
1050 switch (sk
->sk_state
) {
1051 case TCP_ESTABLISHED
:
1052 spin_lock_bh(&xprt
->transport_lock
);
1053 if (!xprt_test_and_set_connected(xprt
)) {
1054 struct sock_xprt
*transport
= container_of(xprt
,
1055 struct sock_xprt
, xprt
);
1057 /* Reset TCP record info */
1058 transport
->tcp_offset
= 0;
1059 transport
->tcp_reclen
= 0;
1060 transport
->tcp_copied
= 0;
1061 transport
->tcp_flags
=
1062 TCP_RCV_COPY_FRAGHDR
| TCP_RCV_COPY_XID
;
1064 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
1065 xprt_wake_pending_tasks(xprt
, 0);
1067 spin_unlock_bh(&xprt
->transport_lock
);
1072 case TCP_CLOSE_WAIT
:
1073 /* Try to schedule an autoclose RPC calls */
1074 set_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
1075 if (test_and_set_bit(XPRT_LOCKED
, &xprt
->state
) == 0)
1076 queue_work(rpciod_workqueue
, &xprt
->task_cleanup
);
1078 xprt_disconnect(xprt
);
1081 read_unlock(&sk
->sk_callback_lock
);
1085 * xs_udp_write_space - callback invoked when socket buffer space
1087 * @sk: socket whose state has changed
1089 * Called when more output buffer space is available for this socket.
1090 * We try not to wake our writers until they can make "significant"
1091 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1092 * with a bunch of small requests.
1094 static void xs_udp_write_space(struct sock
*sk
)
1096 read_lock(&sk
->sk_callback_lock
);
1098 /* from net/core/sock.c:sock_def_write_space */
1099 if (sock_writeable(sk
)) {
1100 struct socket
*sock
;
1101 struct rpc_xprt
*xprt
;
1103 if (unlikely(!(sock
= sk
->sk_socket
)))
1105 if (unlikely(!(xprt
= xprt_from_sock(sk
))))
1107 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE
, &sock
->flags
)))
1110 xprt_write_space(xprt
);
1114 read_unlock(&sk
->sk_callback_lock
);
1118 * xs_tcp_write_space - callback invoked when socket buffer space
1120 * @sk: socket whose state has changed
1122 * Called when more output buffer space is available for this socket.
1123 * We try not to wake our writers until they can make "significant"
1124 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1125 * with a bunch of small requests.
1127 static void xs_tcp_write_space(struct sock
*sk
)
1129 read_lock(&sk
->sk_callback_lock
);
1131 /* from net/core/stream.c:sk_stream_write_space */
1132 if (sk_stream_wspace(sk
) >= sk_stream_min_wspace(sk
)) {
1133 struct socket
*sock
;
1134 struct rpc_xprt
*xprt
;
1136 if (unlikely(!(sock
= sk
->sk_socket
)))
1138 if (unlikely(!(xprt
= xprt_from_sock(sk
))))
1140 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE
, &sock
->flags
)))
1143 xprt_write_space(xprt
);
1147 read_unlock(&sk
->sk_callback_lock
);
1150 static void xs_udp_do_set_buffer_size(struct rpc_xprt
*xprt
)
1152 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1153 struct sock
*sk
= transport
->inet
;
1155 if (transport
->rcvsize
) {
1156 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
1157 sk
->sk_rcvbuf
= transport
->rcvsize
* xprt
->max_reqs
* 2;
1159 if (transport
->sndsize
) {
1160 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
1161 sk
->sk_sndbuf
= transport
->sndsize
* xprt
->max_reqs
* 2;
1162 sk
->sk_write_space(sk
);
1167 * xs_udp_set_buffer_size - set send and receive limits
1168 * @xprt: generic transport
1169 * @sndsize: requested size of send buffer, in bytes
1170 * @rcvsize: requested size of receive buffer, in bytes
1172 * Set socket send and receive buffer size limits.
1174 static void xs_udp_set_buffer_size(struct rpc_xprt
*xprt
, size_t sndsize
, size_t rcvsize
)
1176 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1178 transport
->sndsize
= 0;
1180 transport
->sndsize
= sndsize
+ 1024;
1181 transport
->rcvsize
= 0;
1183 transport
->rcvsize
= rcvsize
+ 1024;
1185 xs_udp_do_set_buffer_size(xprt
);
1189 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1190 * @task: task that timed out
1192 * Adjust the congestion window after a retransmit timeout has occurred.
1194 static void xs_udp_timer(struct rpc_task
*task
)
1196 xprt_adjust_cwnd(task
, -ETIMEDOUT
);
1199 static unsigned short xs_get_random_port(void)
1201 unsigned short range
= xprt_max_resvport
- xprt_min_resvport
;
1202 unsigned short rand
= (unsigned short) net_random() % range
;
1203 return rand
+ xprt_min_resvport
;
1207 * xs_set_port - reset the port number in the remote endpoint address
1208 * @xprt: generic transport
1209 * @port: new port number
1212 static void xs_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1214 struct sockaddr
*addr
= (struct sockaddr
*) &xprt
->addr
;
1216 dprintk("RPC: setting port for xprt %p to %u\n", xprt
, port
);
1218 switch (addr
->sa_family
) {
1220 ((struct sockaddr_in
*)addr
)->sin_port
= htons(port
);
1223 ((struct sockaddr_in6
*)addr
)->sin6_port
= htons(port
);
1230 static int xs_bind4(struct sock_xprt
*transport
, struct socket
*sock
)
1232 struct sockaddr_in myaddr
= {
1233 .sin_family
= AF_INET
,
1235 struct sockaddr_in
*sa
;
1237 unsigned short port
= transport
->port
;
1239 if (!transport
->xprt
.resvport
)
1241 sa
= (struct sockaddr_in
*)&transport
->addr
;
1242 myaddr
.sin_addr
= sa
->sin_addr
;
1244 myaddr
.sin_port
= htons(port
);
1245 err
= kernel_bind(sock
, (struct sockaddr
*) &myaddr
,
1247 if (!transport
->xprt
.resvport
)
1250 transport
->port
= port
;
1253 if (port
<= xprt_min_resvport
)
1254 port
= xprt_max_resvport
;
1257 } while (err
== -EADDRINUSE
&& port
!= transport
->port
);
1258 dprintk("RPC: %s "NIPQUAD_FMT
":%u: %s (%d)\n",
1259 __FUNCTION__
, NIPQUAD(myaddr
.sin_addr
),
1260 port
, err
? "failed" : "ok", err
);
1264 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1265 static struct lock_class_key xs_key
[2];
1266 static struct lock_class_key xs_slock_key
[2];
1268 static inline void xs_reclassify_socket(struct socket
*sock
)
1270 struct sock
*sk
= sock
->sk
;
1271 BUG_ON(sk
->sk_lock
.owner
!= NULL
);
1272 switch (sk
->sk_family
) {
1274 sock_lock_init_class_and_name(sk
, "slock-AF_INET-NFS",
1275 &xs_slock_key
[0], "sk_lock-AF_INET-NFS", &xs_key
[0]);
1279 sock_lock_init_class_and_name(sk
, "slock-AF_INET6-NFS",
1280 &xs_slock_key
[1], "sk_lock-AF_INET6-NFS", &xs_key
[1]);
1288 static inline void xs_reclassify_socket(struct socket
*sock
)
1294 * xs_udp_connect_worker - set up a UDP socket
1295 * @work: RPC transport to connect
1297 * Invoked by a work queue tasklet.
1299 static void xs_udp_connect_worker(struct work_struct
*work
)
1301 struct sock_xprt
*transport
=
1302 container_of(work
, struct sock_xprt
, connect_worker
.work
);
1303 struct rpc_xprt
*xprt
= &transport
->xprt
;
1304 struct socket
*sock
= transport
->sock
;
1305 int err
, status
= -EIO
;
1307 if (xprt
->shutdown
|| !xprt_bound(xprt
))
1310 /* Start by resetting any existing state */
1313 if ((err
= sock_create_kern(PF_INET
, SOCK_DGRAM
, IPPROTO_UDP
, &sock
)) < 0) {
1314 dprintk("RPC: can't create UDP transport socket (%d).\n", -err
);
1317 xs_reclassify_socket(sock
);
1319 if (xs_bind4(transport
, sock
)) {
1324 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1325 xprt
, xprt
->address_strings
[RPC_DISPLAY_ALL
]);
1327 if (!transport
->inet
) {
1328 struct sock
*sk
= sock
->sk
;
1330 write_lock_bh(&sk
->sk_callback_lock
);
1332 sk
->sk_user_data
= xprt
;
1333 transport
->old_data_ready
= sk
->sk_data_ready
;
1334 transport
->old_state_change
= sk
->sk_state_change
;
1335 transport
->old_write_space
= sk
->sk_write_space
;
1336 sk
->sk_data_ready
= xs_udp_data_ready
;
1337 sk
->sk_write_space
= xs_udp_write_space
;
1338 sk
->sk_no_check
= UDP_CSUM_NORCV
;
1339 sk
->sk_allocation
= GFP_ATOMIC
;
1341 xprt_set_connected(xprt
);
1343 /* Reset to new socket */
1344 transport
->sock
= sock
;
1345 transport
->inet
= sk
;
1347 write_unlock_bh(&sk
->sk_callback_lock
);
1349 xs_udp_do_set_buffer_size(xprt
);
1352 xprt_wake_pending_tasks(xprt
, status
);
1353 xprt_clear_connecting(xprt
);
1357 * We need to preserve the port number so the reply cache on the server can
1358 * find our cached RPC replies when we get around to reconnecting.
1360 static void xs_tcp_reuse_connection(struct rpc_xprt
*xprt
)
1363 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1364 struct sockaddr any
;
1366 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt
);
1369 * Disconnect the transport socket by doing a connect operation
1370 * with AF_UNSPEC. This should return immediately...
1372 memset(&any
, 0, sizeof(any
));
1373 any
.sa_family
= AF_UNSPEC
;
1374 result
= kernel_connect(transport
->sock
, &any
, sizeof(any
), 0);
1376 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1381 * xs_tcp_connect_worker - connect a TCP socket to a remote endpoint
1382 * @work: RPC transport to connect
1384 * Invoked by a work queue tasklet.
1386 static void xs_tcp_connect_worker(struct work_struct
*work
)
1388 struct sock_xprt
*transport
=
1389 container_of(work
, struct sock_xprt
, connect_worker
.work
);
1390 struct rpc_xprt
*xprt
= &transport
->xprt
;
1391 struct socket
*sock
= transport
->sock
;
1392 int err
, status
= -EIO
;
1394 if (xprt
->shutdown
|| !xprt_bound(xprt
))
1398 /* start from scratch */
1399 if ((err
= sock_create_kern(PF_INET
, SOCK_STREAM
, IPPROTO_TCP
, &sock
)) < 0) {
1400 dprintk("RPC: can't create TCP transport "
1401 "socket (%d).\n", -err
);
1404 xs_reclassify_socket(sock
);
1406 if (xs_bind4(transport
, sock
)) {
1411 /* "close" the socket, preserving the local port */
1412 xs_tcp_reuse_connection(xprt
);
1414 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1415 xprt
, xprt
->address_strings
[RPC_DISPLAY_ALL
]);
1417 if (!transport
->inet
) {
1418 struct sock
*sk
= sock
->sk
;
1420 write_lock_bh(&sk
->sk_callback_lock
);
1422 sk
->sk_user_data
= xprt
;
1423 transport
->old_data_ready
= sk
->sk_data_ready
;
1424 transport
->old_state_change
= sk
->sk_state_change
;
1425 transport
->old_write_space
= sk
->sk_write_space
;
1426 sk
->sk_data_ready
= xs_tcp_data_ready
;
1427 sk
->sk_state_change
= xs_tcp_state_change
;
1428 sk
->sk_write_space
= xs_tcp_write_space
;
1429 sk
->sk_allocation
= GFP_ATOMIC
;
1431 /* socket options */
1432 sk
->sk_userlocks
|= SOCK_BINDPORT_LOCK
;
1433 sock_reset_flag(sk
, SOCK_LINGER
);
1434 tcp_sk(sk
)->linger2
= 0;
1435 tcp_sk(sk
)->nonagle
|= TCP_NAGLE_OFF
;
1437 xprt_clear_connected(xprt
);
1439 /* Reset to new socket */
1440 transport
->sock
= sock
;
1441 transport
->inet
= sk
;
1443 write_unlock_bh(&sk
->sk_callback_lock
);
1446 /* Tell the socket layer to start connecting... */
1447 xprt
->stat
.connect_count
++;
1448 xprt
->stat
.connect_start
= jiffies
;
1449 status
= kernel_connect(sock
, (struct sockaddr
*) &xprt
->addr
,
1450 xprt
->addrlen
, O_NONBLOCK
);
1451 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1452 xprt
, -status
, xprt_connected(xprt
),
1453 sock
->sk
->sk_state
);
1461 /* retry with existing socket, after a delay */
1464 /* get rid of existing socket, and retry */
1470 xprt_wake_pending_tasks(xprt
, status
);
1472 xprt_clear_connecting(xprt
);
1476 * xs_connect - connect a socket to a remote endpoint
1477 * @task: address of RPC task that manages state of connect request
1479 * TCP: If the remote end dropped the connection, delay reconnecting.
1481 * UDP socket connects are synchronous, but we use a work queue anyway
1482 * to guarantee that even unprivileged user processes can set up a
1483 * socket on a privileged port.
1485 * If a UDP socket connect fails, the delay behavior here prevents
1486 * retry floods (hard mounts).
1488 static void xs_connect(struct rpc_task
*task
)
1490 struct rpc_xprt
*xprt
= task
->tk_xprt
;
1491 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1493 if (xprt_test_and_set_connecting(xprt
))
1496 if (transport
->sock
!= NULL
) {
1497 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1499 xprt
, xprt
->reestablish_timeout
/ HZ
);
1500 queue_delayed_work(rpciod_workqueue
,
1501 &transport
->connect_worker
,
1502 xprt
->reestablish_timeout
);
1503 xprt
->reestablish_timeout
<<= 1;
1504 if (xprt
->reestablish_timeout
> XS_TCP_MAX_REEST_TO
)
1505 xprt
->reestablish_timeout
= XS_TCP_MAX_REEST_TO
;
1507 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt
);
1508 queue_delayed_work(rpciod_workqueue
,
1509 &transport
->connect_worker
, 0);
1514 * xs_udp_print_stats - display UDP socket-specifc stats
1515 * @xprt: rpc_xprt struct containing statistics
1519 static void xs_udp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
1521 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1523 seq_printf(seq
, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1525 xprt
->stat
.bind_count
,
1528 xprt
->stat
.bad_xids
,
1530 xprt
->stat
.bklog_u
);
1534 * xs_tcp_print_stats - display TCP socket-specifc stats
1535 * @xprt: rpc_xprt struct containing statistics
1539 static void xs_tcp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
1541 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1544 if (xprt_connected(xprt
))
1545 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
1547 seq_printf(seq
, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1549 xprt
->stat
.bind_count
,
1550 xprt
->stat
.connect_count
,
1551 xprt
->stat
.connect_time
,
1555 xprt
->stat
.bad_xids
,
1557 xprt
->stat
.bklog_u
);
1560 static struct rpc_xprt_ops xs_udp_ops
= {
1561 .set_buffer_size
= xs_udp_set_buffer_size
,
1562 .reserve_xprt
= xprt_reserve_xprt_cong
,
1563 .release_xprt
= xprt_release_xprt_cong
,
1564 .rpcbind
= rpcb_getport_async
,
1565 .set_port
= xs_set_port
,
1566 .connect
= xs_connect
,
1567 .buf_alloc
= rpc_malloc
,
1568 .buf_free
= rpc_free
,
1569 .send_request
= xs_udp_send_request
,
1570 .set_retrans_timeout
= xprt_set_retrans_timeout_rtt
,
1571 .timer
= xs_udp_timer
,
1572 .release_request
= xprt_release_rqst_cong
,
1574 .destroy
= xs_destroy
,
1575 .print_stats
= xs_udp_print_stats
,
1578 static struct rpc_xprt_ops xs_tcp_ops
= {
1579 .reserve_xprt
= xprt_reserve_xprt
,
1580 .release_xprt
= xs_tcp_release_xprt
,
1581 .rpcbind
= rpcb_getport_async
,
1582 .set_port
= xs_set_port
,
1583 .connect
= xs_connect
,
1584 .buf_alloc
= rpc_malloc
,
1585 .buf_free
= rpc_free
,
1586 .send_request
= xs_tcp_send_request
,
1587 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
1589 .destroy
= xs_destroy
,
1590 .print_stats
= xs_tcp_print_stats
,
1593 static struct rpc_xprt
*xs_setup_xprt(struct rpc_xprtsock_create
*args
, unsigned int slot_table_size
)
1595 struct rpc_xprt
*xprt
;
1596 struct sock_xprt
*new;
1598 if (args
->addrlen
> sizeof(xprt
->addr
)) {
1599 dprintk("RPC: xs_setup_xprt: address too large\n");
1600 return ERR_PTR(-EBADF
);
1603 new = kzalloc(sizeof(*new), GFP_KERNEL
);
1605 dprintk("RPC: xs_setup_xprt: couldn't allocate "
1607 return ERR_PTR(-ENOMEM
);
1611 xprt
->max_reqs
= slot_table_size
;
1612 xprt
->slot
= kcalloc(xprt
->max_reqs
, sizeof(struct rpc_rqst
), GFP_KERNEL
);
1613 if (xprt
->slot
== NULL
) {
1615 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
1617 return ERR_PTR(-ENOMEM
);
1620 memcpy(&xprt
->addr
, args
->dstaddr
, args
->addrlen
);
1621 xprt
->addrlen
= args
->addrlen
;
1623 memcpy(&new->addr
, args
->srcaddr
, args
->addrlen
);
1624 new->port
= xs_get_random_port();
1630 * xs_setup_udp - Set up transport to use a UDP socket
1631 * @args: rpc transport creation arguments
1634 struct rpc_xprt
*xs_setup_udp(struct rpc_xprtsock_create
*args
)
1636 struct rpc_xprt
*xprt
;
1637 struct sock_xprt
*transport
;
1639 xprt
= xs_setup_xprt(args
, xprt_udp_slot_table_entries
);
1642 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1644 if (ntohs(((struct sockaddr_in
*)args
->dstaddr
)->sin_port
) != 0)
1645 xprt_set_bound(xprt
);
1647 xprt
->prot
= IPPROTO_UDP
;
1649 /* XXX: header size can vary due to auth type, IPv6, etc. */
1650 xprt
->max_payload
= (1U << 16) - (MAX_HEADER
<< 3);
1652 INIT_DELAYED_WORK(&transport
->connect_worker
, xs_udp_connect_worker
);
1653 xprt
->bind_timeout
= XS_BIND_TO
;
1654 xprt
->connect_timeout
= XS_UDP_CONN_TO
;
1655 xprt
->reestablish_timeout
= XS_UDP_REEST_TO
;
1656 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
1658 xprt
->ops
= &xs_udp_ops
;
1661 xprt
->timeout
= *args
->timeout
;
1663 xprt_set_timeout(&xprt
->timeout
, 5, 5 * HZ
);
1665 xs_format_ipv4_peer_addresses(xprt
);
1666 dprintk("RPC: set up transport to address %s\n",
1667 xprt
->address_strings
[RPC_DISPLAY_ALL
]);
1673 * xs_setup_tcp - Set up transport to use a TCP socket
1674 * @args: rpc transport creation arguments
1677 struct rpc_xprt
*xs_setup_tcp(struct rpc_xprtsock_create
*args
)
1679 struct rpc_xprt
*xprt
;
1680 struct sock_xprt
*transport
;
1682 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
);
1685 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1687 if (ntohs(((struct sockaddr_in
*)args
->dstaddr
)->sin_port
) != 0)
1688 xprt_set_bound(xprt
);
1690 xprt
->prot
= IPPROTO_TCP
;
1691 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
1692 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
1694 INIT_DELAYED_WORK(&transport
->connect_worker
, xs_tcp_connect_worker
);
1695 xprt
->bind_timeout
= XS_BIND_TO
;
1696 xprt
->connect_timeout
= XS_TCP_CONN_TO
;
1697 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
1698 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
1700 xprt
->ops
= &xs_tcp_ops
;
1703 xprt
->timeout
= *args
->timeout
;
1705 xprt_set_timeout(&xprt
->timeout
, 2, 60 * HZ
);
1707 xs_format_ipv4_peer_addresses(xprt
);
1708 dprintk("RPC: set up transport to address %s\n",
1709 xprt
->address_strings
[RPC_DISPLAY_ALL
]);
1715 * init_socket_xprt - set up xprtsock's sysctls
1718 int init_socket_xprt(void)
1721 if (!sunrpc_table_header
)
1722 sunrpc_table_header
= register_sysctl_table(sunrpc_table
);
1729 * cleanup_socket_xprt - remove xprtsock's sysctls
1732 void cleanup_socket_xprt(void)
1735 if (sunrpc_table_header
) {
1736 unregister_sysctl_table(sunrpc_table_header
);
1737 sunrpc_table_header
= NULL
;