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/slab.h>
23 #include <linux/module.h>
24 #include <linux/capability.h>
25 #include <linux/pagemap.h>
26 #include <linux/errno.h>
27 #include <linux/socket.h>
29 #include <linux/net.h>
31 #include <linux/udp.h>
32 #include <linux/tcp.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/sched.h>
35 #include <linux/sunrpc/svcsock.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/file.h>
38 #ifdef CONFIG_NFS_V4_1
39 #include <linux/sunrpc/bc_xprt.h>
43 #include <net/checksum.h>
51 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
52 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
54 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
55 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
57 #define XS_TCP_LINGER_TO (15U * HZ)
58 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
61 * We can register our own files under /proc/sys/sunrpc by
62 * calling register_sysctl_table() again. The files in that
63 * directory become the union of all files registered there.
65 * We simply need to make sure that we don't collide with
66 * someone else's file names!
71 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
72 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
73 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
74 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
76 static struct ctl_table_header *sunrpc_table_header;
79 * FIXME: changing the UDP slot table size should also resize the UDP
80 * socket buffers for existing UDP transports
82 static ctl_table xs_tunables_table[] = {
84 .procname = "udp_slot_table_entries",
85 .data = &xprt_udp_slot_table_entries,
86 .maxlen = sizeof(unsigned int),
88 .proc_handler = proc_dointvec_minmax,
89 .extra1 = &min_slot_table_size,
90 .extra2 = &max_slot_table_size
93 .procname = "tcp_slot_table_entries",
94 .data = &xprt_tcp_slot_table_entries,
95 .maxlen = sizeof(unsigned int),
97 .proc_handler = proc_dointvec_minmax,
98 .extra1 = &min_slot_table_size,
99 .extra2 = &max_slot_table_size
102 .procname = "min_resvport",
103 .data = &xprt_min_resvport,
104 .maxlen = sizeof(unsigned int),
106 .proc_handler = proc_dointvec_minmax,
107 .extra1 = &xprt_min_resvport_limit,
108 .extra2 = &xprt_max_resvport_limit
111 .procname = "max_resvport",
112 .data = &xprt_max_resvport,
113 .maxlen = sizeof(unsigned int),
115 .proc_handler = proc_dointvec_minmax,
116 .extra1 = &xprt_min_resvport_limit,
117 .extra2 = &xprt_max_resvport_limit
120 .procname = "tcp_fin_timeout",
121 .data = &xs_tcp_fin_timeout,
122 .maxlen = sizeof(xs_tcp_fin_timeout),
124 .proc_handler = proc_dointvec_jiffies,
129 static ctl_table sunrpc_table[] = {
131 .procname = "sunrpc",
133 .child = xs_tunables_table
141 * Wait duration for a reply from the RPC portmapper.
143 #define XS_BIND_TO (60U * HZ)
146 * Delay if a UDP socket connect error occurs. This is most likely some
147 * kind of resource problem on the local host.
149 #define XS_UDP_REEST_TO (2U * HZ)
152 * The reestablish timeout allows clients to delay for a bit before attempting
153 * to reconnect to a server that just dropped our connection.
155 * We implement an exponential backoff when trying to reestablish a TCP
156 * transport connection with the server. Some servers like to drop a TCP
157 * connection when they are overworked, so we start with a short timeout and
158 * increase over time if the server is down or not responding.
160 #define XS_TCP_INIT_REEST_TO (3U * HZ)
161 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
164 * TCP idle timeout; client drops the transport socket if it is idle
165 * for this long. Note that we also timeout UDP sockets to prevent
166 * holding port numbers when there is no RPC traffic.
168 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
171 # undef RPC_DEBUG_DATA
172 # define RPCDBG_FACILITY RPCDBG_TRANS
175 #ifdef RPC_DEBUG_DATA
176 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
178 u8 *buf = (u8 *) packet;
181 dprintk("RPC: %s\n", msg);
182 for (j = 0; j < count && j < 128; j += 4) {
186 dprintk("0x%04x ", j);
188 dprintk("%02x%02x%02x%02x ",
189 buf[j], buf[j+1], buf[j+2], buf[j+3]);
194 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
201 struct rpc_xprt xprt;
206 struct socket * sock;
210 * State of TCP reply receive
219 unsigned long tcp_copied,
223 * Connection of transports
225 struct delayed_work connect_worker;
226 struct sockaddr_storage srcaddr;
227 unsigned short srcport;
230 * UDP socket buffer size parameters
236 * Saved socket callback addresses
238 void (*old_data_ready)(struct sock *, int);
239 void (*old_state_change)(struct sock *);
240 void (*old_write_space)(struct sock *);
241 void (*old_error_report)(struct sock *);
245 * TCP receive state flags
247 #define TCP_RCV_LAST_FRAG (1UL << 0)
248 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
249 #define TCP_RCV_COPY_XID (1UL << 2)
250 #define TCP_RCV_COPY_DATA (1UL << 3)
251 #define TCP_RCV_READ_CALLDIR (1UL << 4)
252 #define TCP_RCV_COPY_CALLDIR (1UL << 5)
257 #define TCP_RPC_REPLY (1UL << 6)
259 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
261 return (struct sockaddr *) &xprt->addr;
264 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
266 return (struct sockaddr_in *) &xprt->addr;
269 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
271 return (struct sockaddr_in6 *) &xprt->addr;
274 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
276 struct sockaddr *sap = xs_addr(xprt);
277 struct sockaddr_in6 *sin6;
278 struct sockaddr_in *sin;
281 (void)rpc_ntop(sap, buf, sizeof(buf));
282 xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL);
284 switch (sap->sa_family) {
286 sin = xs_addr_in(xprt);
287 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
290 sin6 = xs_addr_in6(xprt);
291 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
296 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
299 static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
301 struct sockaddr *sap = xs_addr(xprt);
304 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
305 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
307 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
308 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
311 static void xs_format_peer_addresses(struct rpc_xprt *xprt,
312 const char *protocol,
315 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
316 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
317 xs_format_common_peer_addresses(xprt);
318 xs_format_common_peer_ports(xprt);
321 static void xs_update_peer_port(struct rpc_xprt *xprt)
323 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
324 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
326 xs_format_common_peer_ports(xprt);
329 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
333 for (i = 0; i < RPC_DISPLAY_MAX; i++)
335 case RPC_DISPLAY_PROTO:
336 case RPC_DISPLAY_NETID:
339 kfree(xprt->address_strings[i]);
343 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
345 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
347 struct msghdr msg = {
349 .msg_namelen = addrlen,
350 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
353 .iov_base = vec->iov_base + base,
354 .iov_len = vec->iov_len - base,
357 if (iov.iov_len != 0)
358 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
359 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
362 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
365 unsigned int remainder;
368 remainder = xdr->page_len - base;
369 base += xdr->page_base;
370 ppage = xdr->pages + (base >> PAGE_SHIFT);
373 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
374 int flags = XS_SENDMSG_FLAGS;
377 if (remainder != 0 || more)
379 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
380 if (remainder == 0 || err != len)
394 * xs_sendpages - write pages directly to a socket
395 * @sock: socket to send on
396 * @addr: UDP only -- address of destination
397 * @addrlen: UDP only -- length of destination address
398 * @xdr: buffer containing this request
399 * @base: starting position in the buffer
402 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
404 unsigned int remainder = xdr->len - base;
410 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
416 if (base < xdr->head[0].iov_len || addr != NULL) {
417 unsigned int len = xdr->head[0].iov_len - base;
419 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
420 if (remainder == 0 || err != len)
425 base -= xdr->head[0].iov_len;
427 if (base < xdr->page_len) {
428 unsigned int len = xdr->page_len - base;
430 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
431 if (remainder == 0 || err != len)
436 base -= xdr->page_len;
438 if (base >= xdr->tail[0].iov_len)
440 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
449 static void xs_nospace_callback(struct rpc_task *task)
451 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
453 transport->inet->sk_write_pending--;
454 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
458 * xs_nospace - place task on wait queue if transmit was incomplete
459 * @task: task to put to sleep
462 static int xs_nospace(struct rpc_task *task)
464 struct rpc_rqst *req = task->tk_rqstp;
465 struct rpc_xprt *xprt = req->rq_xprt;
466 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
469 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
470 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
473 /* Protect against races with write_space */
474 spin_lock_bh(&xprt->transport_lock);
476 /* Don't race with disconnect */
477 if (xprt_connected(xprt)) {
478 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
481 * Notify TCP that we're limited by the application
484 set_bit(SOCK_NOSPACE, &transport->sock->flags);
485 transport->inet->sk_write_pending++;
486 /* ...and wait for more buffer space */
487 xprt_wait_for_buffer_space(task, xs_nospace_callback);
490 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
494 spin_unlock_bh(&xprt->transport_lock);
499 * xs_udp_send_request - write an RPC request to a UDP socket
500 * @task: address of RPC task that manages the state of an RPC request
503 * 0: The request has been sent
504 * EAGAIN: The socket was blocked, please call again later to
505 * complete the request
506 * ENOTCONN: Caller needs to invoke connect logic then call again
507 * other: Some other error occured, the request was not sent
509 static int xs_udp_send_request(struct rpc_task *task)
511 struct rpc_rqst *req = task->tk_rqstp;
512 struct rpc_xprt *xprt = req->rq_xprt;
513 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
514 struct xdr_buf *xdr = &req->rq_snd_buf;
517 xs_pktdump("packet data:",
518 req->rq_svec->iov_base,
519 req->rq_svec->iov_len);
521 if (!xprt_bound(xprt))
523 status = xs_sendpages(transport->sock,
528 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
529 xdr->len - req->rq_bytes_sent, status);
532 req->rq_xmit_bytes_sent += status;
533 if (status >= req->rq_slen)
535 /* Still some bytes left; set up for a retry later. */
542 /* Should we call xs_close() here? */
545 status = xs_nospace(task);
548 dprintk("RPC: sendmsg returned unrecognized error %d\n",
553 /* When the server has died, an ICMP port unreachable message
554 * prompts ECONNREFUSED. */
555 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
562 * xs_tcp_shutdown - gracefully shut down a TCP socket
565 * Initiates a graceful shutdown of the TCP socket by calling the
566 * equivalent of shutdown(SHUT_WR);
568 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
570 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
571 struct socket *sock = transport->sock;
574 kernel_sock_shutdown(sock, SHUT_WR);
577 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
579 u32 reclen = buf->len - sizeof(rpc_fraghdr);
580 rpc_fraghdr *base = buf->head[0].iov_base;
581 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
585 * xs_tcp_send_request - write an RPC request to a TCP socket
586 * @task: address of RPC task that manages the state of an RPC request
589 * 0: The request has been sent
590 * EAGAIN: The socket was blocked, please call again later to
591 * complete the request
592 * ENOTCONN: Caller needs to invoke connect logic then call again
593 * other: Some other error occured, the request was not sent
595 * XXX: In the case of soft timeouts, should we eventually give up
596 * if sendmsg is not able to make progress?
598 static int xs_tcp_send_request(struct rpc_task *task)
600 struct rpc_rqst *req = task->tk_rqstp;
601 struct rpc_xprt *xprt = req->rq_xprt;
602 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
603 struct xdr_buf *xdr = &req->rq_snd_buf;
606 xs_encode_tcp_record_marker(&req->rq_snd_buf);
608 xs_pktdump("packet data:",
609 req->rq_svec->iov_base,
610 req->rq_svec->iov_len);
612 /* Continue transmitting the packet/record. We must be careful
613 * to cope with writespace callbacks arriving _after_ we have
614 * called sendmsg(). */
616 status = xs_sendpages(transport->sock,
617 NULL, 0, xdr, req->rq_bytes_sent);
619 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
620 xdr->len - req->rq_bytes_sent, status);
622 if (unlikely(status < 0))
625 /* If we've sent the entire packet, immediately
626 * reset the count of bytes sent. */
627 req->rq_bytes_sent += status;
628 req->rq_xmit_bytes_sent += status;
629 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
630 req->rq_bytes_sent = 0;
643 /* Should we call xs_close() here? */
646 status = xs_nospace(task);
649 dprintk("RPC: sendmsg returned unrecognized error %d\n",
653 xs_tcp_shutdown(xprt);
656 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
663 * xs_tcp_release_xprt - clean up after a tcp transmission
667 * This cleans up if an error causes us to abort the transmission of a request.
668 * In this case, the socket may need to be reset in order to avoid confusing
671 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
673 struct rpc_rqst *req;
675 if (task != xprt->snd_task)
679 req = task->tk_rqstp;
680 if (req->rq_bytes_sent == 0)
682 if (req->rq_bytes_sent == req->rq_snd_buf.len)
684 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
686 xprt_release_xprt(xprt, task);
689 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
691 transport->old_data_ready = sk->sk_data_ready;
692 transport->old_state_change = sk->sk_state_change;
693 transport->old_write_space = sk->sk_write_space;
694 transport->old_error_report = sk->sk_error_report;
697 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
699 sk->sk_data_ready = transport->old_data_ready;
700 sk->sk_state_change = transport->old_state_change;
701 sk->sk_write_space = transport->old_write_space;
702 sk->sk_error_report = transport->old_error_report;
705 static void xs_reset_transport(struct sock_xprt *transport)
707 struct socket *sock = transport->sock;
708 struct sock *sk = transport->inet;
713 write_lock_bh(&sk->sk_callback_lock);
714 transport->inet = NULL;
715 transport->sock = NULL;
717 sk->sk_user_data = NULL;
719 xs_restore_old_callbacks(transport, sk);
720 write_unlock_bh(&sk->sk_callback_lock);
728 * xs_close - close a socket
731 * This is used when all requests are complete; ie, no DRC state remains
732 * on the server we want to save.
734 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
735 * xs_reset_transport() zeroing the socket from underneath a writer.
737 static void xs_close(struct rpc_xprt *xprt)
739 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
741 dprintk("RPC: xs_close xprt %p\n", xprt);
743 xs_reset_transport(transport);
744 xprt->reestablish_timeout = 0;
746 smp_mb__before_clear_bit();
747 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
748 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
749 clear_bit(XPRT_CLOSING, &xprt->state);
750 smp_mb__after_clear_bit();
751 xprt_disconnect_done(xprt);
754 static void xs_tcp_close(struct rpc_xprt *xprt)
756 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
759 xs_tcp_shutdown(xprt);
763 * xs_destroy - prepare to shutdown a transport
764 * @xprt: doomed transport
767 static void xs_destroy(struct rpc_xprt *xprt)
769 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
771 dprintk("RPC: xs_destroy xprt %p\n", xprt);
773 cancel_rearming_delayed_work(&transport->connect_worker);
776 xs_free_peer_addresses(xprt);
778 module_put(THIS_MODULE);
781 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
783 return (struct rpc_xprt *) sk->sk_user_data;
787 * xs_udp_data_ready - "data ready" callback for UDP sockets
788 * @sk: socket with data to read
789 * @len: how much data to read
792 static void xs_udp_data_ready(struct sock *sk, int len)
794 struct rpc_task *task;
795 struct rpc_xprt *xprt;
796 struct rpc_rqst *rovr;
798 int err, repsize, copied;
802 read_lock(&sk->sk_callback_lock);
803 dprintk("RPC: xs_udp_data_ready...\n");
804 if (!(xprt = xprt_from_sock(sk)))
807 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
813 repsize = skb->len - sizeof(struct udphdr);
815 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
819 /* Copy the XID from the skb... */
820 xp = skb_header_pointer(skb, sizeof(struct udphdr),
821 sizeof(_xid), &_xid);
825 /* Look up and lock the request corresponding to the given XID */
826 spin_lock(&xprt->transport_lock);
827 rovr = xprt_lookup_rqst(xprt, *xp);
830 task = rovr->rq_task;
832 if ((copied = rovr->rq_private_buf.buflen) > repsize)
835 /* Suck it into the iovec, verify checksum if not done by hw. */
836 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
837 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
841 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
843 /* Something worked... */
844 dst_confirm(skb_dst(skb));
846 xprt_adjust_cwnd(task, copied);
847 xprt_complete_rqst(task, copied);
850 spin_unlock(&xprt->transport_lock);
852 skb_free_datagram(sk, skb);
854 read_unlock(&sk->sk_callback_lock);
857 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
859 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
863 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
864 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
865 used = xdr_skb_read_bits(desc, p, len);
866 transport->tcp_offset += used;
870 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
871 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
872 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
874 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
875 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
877 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
878 transport->tcp_offset = 0;
880 /* Sanity check of the record length */
881 if (unlikely(transport->tcp_reclen < 8)) {
882 dprintk("RPC: invalid TCP record fragment length\n");
883 xprt_force_disconnect(xprt);
886 dprintk("RPC: reading TCP record fragment of length %d\n",
887 transport->tcp_reclen);
890 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
892 if (transport->tcp_offset == transport->tcp_reclen) {
893 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
894 transport->tcp_offset = 0;
895 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
896 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
897 transport->tcp_flags |= TCP_RCV_COPY_XID;
898 transport->tcp_copied = 0;
903 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
908 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
909 dprintk("RPC: reading XID (%Zu bytes)\n", len);
910 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
911 used = xdr_skb_read_bits(desc, p, len);
912 transport->tcp_offset += used;
915 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
916 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
917 transport->tcp_copied = 4;
918 dprintk("RPC: reading %s XID %08x\n",
919 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
921 ntohl(transport->tcp_xid));
922 xs_tcp_check_fraghdr(transport);
925 static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
926 struct xdr_skb_reader *desc)
933 * We want transport->tcp_offset to be 8 at the end of this routine
934 * (4 bytes for the xid and 4 bytes for the call/reply flag).
935 * When this function is called for the first time,
936 * transport->tcp_offset is 4 (after having already read the xid).
938 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
939 len = sizeof(transport->tcp_calldir) - offset;
940 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
941 p = ((char *) &transport->tcp_calldir) + offset;
942 used = xdr_skb_read_bits(desc, p, len);
943 transport->tcp_offset += used;
946 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
948 * We don't yet have the XDR buffer, so we will write the calldir
949 * out after we get the buffer from the 'struct rpc_rqst'
951 switch (ntohl(transport->tcp_calldir)) {
953 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
954 transport->tcp_flags |= TCP_RCV_COPY_DATA;
955 transport->tcp_flags |= TCP_RPC_REPLY;
958 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
959 transport->tcp_flags |= TCP_RCV_COPY_DATA;
960 transport->tcp_flags &= ~TCP_RPC_REPLY;
963 dprintk("RPC: invalid request message type\n");
964 xprt_force_disconnect(&transport->xprt);
966 xs_tcp_check_fraghdr(transport);
969 static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
970 struct xdr_skb_reader *desc,
971 struct rpc_rqst *req)
973 struct sock_xprt *transport =
974 container_of(xprt, struct sock_xprt, xprt);
975 struct xdr_buf *rcvbuf;
979 rcvbuf = &req->rq_private_buf;
981 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
983 * Save the RPC direction in the XDR buffer
985 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
986 &transport->tcp_calldir,
987 sizeof(transport->tcp_calldir));
988 transport->tcp_copied += sizeof(transport->tcp_calldir);
989 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
993 if (len > transport->tcp_reclen - transport->tcp_offset) {
994 struct xdr_skb_reader my_desc;
996 len = transport->tcp_reclen - transport->tcp_offset;
997 memcpy(&my_desc, desc, sizeof(my_desc));
999 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1000 &my_desc, xdr_skb_read_bits);
1004 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1005 desc, xdr_skb_read_bits);
1008 transport->tcp_copied += r;
1009 transport->tcp_offset += r;
1012 /* Error when copying to the receive buffer,
1013 * usually because we weren't able to allocate
1014 * additional buffer pages. All we can do now
1015 * is turn off TCP_RCV_COPY_DATA, so the request
1016 * will not receive any additional updates,
1018 * Any remaining data from this record will
1021 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1022 dprintk("RPC: XID %08x truncated request\n",
1023 ntohl(transport->tcp_xid));
1024 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1025 "tcp_offset = %u, tcp_reclen = %u\n",
1026 xprt, transport->tcp_copied,
1027 transport->tcp_offset, transport->tcp_reclen);
1031 dprintk("RPC: XID %08x read %Zd bytes\n",
1032 ntohl(transport->tcp_xid), r);
1033 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1034 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1035 transport->tcp_offset, transport->tcp_reclen);
1037 if (transport->tcp_copied == req->rq_private_buf.buflen)
1038 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1039 else if (transport->tcp_offset == transport->tcp_reclen) {
1040 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1041 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1046 * Finds the request corresponding to the RPC xid and invokes the common
1047 * tcp read code to read the data.
1049 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1050 struct xdr_skb_reader *desc)
1052 struct sock_xprt *transport =
1053 container_of(xprt, struct sock_xprt, xprt);
1054 struct rpc_rqst *req;
1056 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1058 /* Find and lock the request corresponding to this xid */
1059 spin_lock(&xprt->transport_lock);
1060 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1062 dprintk("RPC: XID %08x request not found!\n",
1063 ntohl(transport->tcp_xid));
1064 spin_unlock(&xprt->transport_lock);
1068 xs_tcp_read_common(xprt, desc, req);
1070 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1071 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1073 spin_unlock(&xprt->transport_lock);
1077 #if defined(CONFIG_NFS_V4_1)
1079 * Obtains an rpc_rqst previously allocated and invokes the common
1080 * tcp read code to read the data. The result is placed in the callback
1082 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1083 * connection and return -1.
1085 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
1086 struct xdr_skb_reader *desc)
1088 struct sock_xprt *transport =
1089 container_of(xprt, struct sock_xprt, xprt);
1090 struct rpc_rqst *req;
1092 req = xprt_alloc_bc_request(xprt);
1094 printk(KERN_WARNING "Callback slot table overflowed\n");
1095 xprt_force_disconnect(xprt);
1099 req->rq_xid = transport->tcp_xid;
1100 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1101 xs_tcp_read_common(xprt, desc, req);
1103 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
1104 struct svc_serv *bc_serv = xprt->bc_serv;
1107 * Add callback request to callback list. The callback
1108 * service sleeps on the sv_cb_waitq waiting for new
1109 * requests. Wake it up after adding enqueing the
1112 dprintk("RPC: add callback request to list\n");
1113 spin_lock(&bc_serv->sv_cb_lock);
1114 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
1115 spin_unlock(&bc_serv->sv_cb_lock);
1116 wake_up(&bc_serv->sv_cb_waitq);
1119 req->rq_private_buf.len = transport->tcp_copied;
1124 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1125 struct xdr_skb_reader *desc)
1127 struct sock_xprt *transport =
1128 container_of(xprt, struct sock_xprt, xprt);
1130 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1131 xs_tcp_read_reply(xprt, desc) :
1132 xs_tcp_read_callback(xprt, desc);
1135 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1136 struct xdr_skb_reader *desc)
1138 return xs_tcp_read_reply(xprt, desc);
1140 #endif /* CONFIG_NFS_V4_1 */
1143 * Read data off the transport. This can be either an RPC_CALL or an
1144 * RPC_REPLY. Relay the processing to helper functions.
1146 static void xs_tcp_read_data(struct rpc_xprt *xprt,
1147 struct xdr_skb_reader *desc)
1149 struct sock_xprt *transport =
1150 container_of(xprt, struct sock_xprt, xprt);
1152 if (_xs_tcp_read_data(xprt, desc) == 0)
1153 xs_tcp_check_fraghdr(transport);
1156 * The transport_lock protects the request handling.
1157 * There's no need to hold it to update the tcp_flags.
1159 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1163 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1167 len = transport->tcp_reclen - transport->tcp_offset;
1168 if (len > desc->count)
1171 desc->offset += len;
1172 transport->tcp_offset += len;
1173 dprintk("RPC: discarded %Zu bytes\n", len);
1174 xs_tcp_check_fraghdr(transport);
1177 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1179 struct rpc_xprt *xprt = rd_desc->arg.data;
1180 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1181 struct xdr_skb_reader desc = {
1187 dprintk("RPC: xs_tcp_data_recv started\n");
1189 /* Read in a new fragment marker if necessary */
1190 /* Can we ever really expect to get completely empty fragments? */
1191 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1192 xs_tcp_read_fraghdr(xprt, &desc);
1195 /* Read in the xid if necessary */
1196 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1197 xs_tcp_read_xid(transport, &desc);
1200 /* Read in the call/reply flag */
1201 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1202 xs_tcp_read_calldir(transport, &desc);
1205 /* Read in the request data */
1206 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1207 xs_tcp_read_data(xprt, &desc);
1210 /* Skip over any trailing bytes on short reads */
1211 xs_tcp_read_discard(transport, &desc);
1212 } while (desc.count);
1213 dprintk("RPC: xs_tcp_data_recv done\n");
1214 return len - desc.count;
1218 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1219 * @sk: socket with data to read
1220 * @bytes: how much data to read
1223 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1225 struct rpc_xprt *xprt;
1226 read_descriptor_t rd_desc;
1229 dprintk("RPC: xs_tcp_data_ready...\n");
1231 read_lock(&sk->sk_callback_lock);
1232 if (!(xprt = xprt_from_sock(sk)))
1237 /* Any data means we had a useful conversation, so
1238 * the we don't need to delay the next reconnect
1240 if (xprt->reestablish_timeout)
1241 xprt->reestablish_timeout = 0;
1243 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1244 rd_desc.arg.data = xprt;
1246 rd_desc.count = 65536;
1247 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1250 read_unlock(&sk->sk_callback_lock);
1254 * Do the equivalent of linger/linger2 handling for dealing with
1255 * broken servers that don't close the socket in a timely
1258 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1259 unsigned long timeout)
1261 struct sock_xprt *transport;
1263 if (xprt_test_and_set_connecting(xprt))
1265 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1266 transport = container_of(xprt, struct sock_xprt, xprt);
1267 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1271 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1273 struct sock_xprt *transport;
1275 transport = container_of(xprt, struct sock_xprt, xprt);
1277 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1278 !cancel_delayed_work(&transport->connect_worker))
1280 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1281 xprt_clear_connecting(xprt);
1284 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1286 smp_mb__before_clear_bit();
1287 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1288 clear_bit(XPRT_CLOSING, &xprt->state);
1289 smp_mb__after_clear_bit();
1290 /* Mark transport as closed and wake up all pending tasks */
1291 xprt_disconnect_done(xprt);
1295 * xs_tcp_state_change - callback to handle TCP socket state changes
1296 * @sk: socket whose state has changed
1299 static void xs_tcp_state_change(struct sock *sk)
1301 struct rpc_xprt *xprt;
1303 read_lock(&sk->sk_callback_lock);
1304 if (!(xprt = xprt_from_sock(sk)))
1306 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1307 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1308 sk->sk_state, xprt_connected(xprt),
1309 sock_flag(sk, SOCK_DEAD),
1310 sock_flag(sk, SOCK_ZAPPED),
1313 switch (sk->sk_state) {
1314 case TCP_ESTABLISHED:
1315 spin_lock_bh(&xprt->transport_lock);
1316 if (!xprt_test_and_set_connected(xprt)) {
1317 struct sock_xprt *transport = container_of(xprt,
1318 struct sock_xprt, xprt);
1320 /* Reset TCP record info */
1321 transport->tcp_offset = 0;
1322 transport->tcp_reclen = 0;
1323 transport->tcp_copied = 0;
1324 transport->tcp_flags =
1325 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1327 xprt_wake_pending_tasks(xprt, -EAGAIN);
1329 spin_unlock_bh(&xprt->transport_lock);
1332 /* The client initiated a shutdown of the socket */
1333 xprt->connect_cookie++;
1334 xprt->reestablish_timeout = 0;
1335 set_bit(XPRT_CLOSING, &xprt->state);
1336 smp_mb__before_clear_bit();
1337 clear_bit(XPRT_CONNECTED, &xprt->state);
1338 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1339 smp_mb__after_clear_bit();
1340 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1342 case TCP_CLOSE_WAIT:
1343 /* The server initiated a shutdown of the socket */
1344 xprt_force_disconnect(xprt);
1346 xprt->connect_cookie++;
1349 * If the server closed down the connection, make sure that
1350 * we back off before reconnecting
1352 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1353 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1356 set_bit(XPRT_CLOSING, &xprt->state);
1357 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1358 smp_mb__before_clear_bit();
1359 clear_bit(XPRT_CONNECTED, &xprt->state);
1360 smp_mb__after_clear_bit();
1363 xs_tcp_cancel_linger_timeout(xprt);
1364 xs_sock_mark_closed(xprt);
1367 read_unlock(&sk->sk_callback_lock);
1371 * xs_error_report - callback mainly for catching socket errors
1374 static void xs_error_report(struct sock *sk)
1376 struct rpc_xprt *xprt;
1378 read_lock(&sk->sk_callback_lock);
1379 if (!(xprt = xprt_from_sock(sk)))
1381 dprintk("RPC: %s client %p...\n"
1383 __func__, xprt, sk->sk_err);
1384 xprt_wake_pending_tasks(xprt, -EAGAIN);
1386 read_unlock(&sk->sk_callback_lock);
1389 static void xs_write_space(struct sock *sk)
1391 struct socket *sock;
1392 struct rpc_xprt *xprt;
1394 if (unlikely(!(sock = sk->sk_socket)))
1396 clear_bit(SOCK_NOSPACE, &sock->flags);
1398 if (unlikely(!(xprt = xprt_from_sock(sk))))
1400 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1403 xprt_write_space(xprt);
1407 * xs_udp_write_space - callback invoked when socket buffer space
1409 * @sk: socket whose state has changed
1411 * Called when more output buffer space is available for this socket.
1412 * We try not to wake our writers until they can make "significant"
1413 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1414 * with a bunch of small requests.
1416 static void xs_udp_write_space(struct sock *sk)
1418 read_lock(&sk->sk_callback_lock);
1420 /* from net/core/sock.c:sock_def_write_space */
1421 if (sock_writeable(sk))
1424 read_unlock(&sk->sk_callback_lock);
1428 * xs_tcp_write_space - callback invoked when socket buffer space
1430 * @sk: socket whose state has changed
1432 * Called when more output buffer space is available for this socket.
1433 * We try not to wake our writers until they can make "significant"
1434 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1435 * with a bunch of small requests.
1437 static void xs_tcp_write_space(struct sock *sk)
1439 read_lock(&sk->sk_callback_lock);
1441 /* from net/core/stream.c:sk_stream_write_space */
1442 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1445 read_unlock(&sk->sk_callback_lock);
1448 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1450 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1451 struct sock *sk = transport->inet;
1453 if (transport->rcvsize) {
1454 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1455 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1457 if (transport->sndsize) {
1458 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1459 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1460 sk->sk_write_space(sk);
1465 * xs_udp_set_buffer_size - set send and receive limits
1466 * @xprt: generic transport
1467 * @sndsize: requested size of send buffer, in bytes
1468 * @rcvsize: requested size of receive buffer, in bytes
1470 * Set socket send and receive buffer size limits.
1472 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1474 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1476 transport->sndsize = 0;
1478 transport->sndsize = sndsize + 1024;
1479 transport->rcvsize = 0;
1481 transport->rcvsize = rcvsize + 1024;
1483 xs_udp_do_set_buffer_size(xprt);
1487 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1488 * @task: task that timed out
1490 * Adjust the congestion window after a retransmit timeout has occurred.
1492 static void xs_udp_timer(struct rpc_task *task)
1494 xprt_adjust_cwnd(task, -ETIMEDOUT);
1497 static unsigned short xs_get_random_port(void)
1499 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1500 unsigned short rand = (unsigned short) net_random() % range;
1501 return rand + xprt_min_resvport;
1505 * xs_set_port - reset the port number in the remote endpoint address
1506 * @xprt: generic transport
1507 * @port: new port number
1510 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1512 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1514 rpc_set_port(xs_addr(xprt), port);
1515 xs_update_peer_port(xprt);
1518 static unsigned short xs_get_srcport(struct sock_xprt *transport)
1520 unsigned short port = transport->srcport;
1522 if (port == 0 && transport->xprt.resvport)
1523 port = xs_get_random_port();
1527 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1529 if (transport->srcport != 0)
1530 transport->srcport = 0;
1531 if (!transport->xprt.resvport)
1533 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1534 return xprt_max_resvport;
1537 static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1539 struct sockaddr_storage myaddr;
1541 unsigned short port = xs_get_srcport(transport);
1542 unsigned short last;
1544 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1546 rpc_set_port((struct sockaddr *)&myaddr, port);
1547 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1548 transport->xprt.addrlen);
1552 transport->srcport = port;
1556 port = xs_next_srcport(transport, port);
1559 } while (err == -EADDRINUSE && nloop != 2);
1561 if (myaddr.ss_family == AF_INET)
1562 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1563 &((struct sockaddr_in *)&myaddr)->sin_addr,
1564 port, err ? "failed" : "ok", err);
1566 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1567 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1568 port, err ? "failed" : "ok", err);
1573 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1574 static struct lock_class_key xs_key[2];
1575 static struct lock_class_key xs_slock_key[2];
1577 static inline void xs_reclassify_socket4(struct socket *sock)
1579 struct sock *sk = sock->sk;
1581 BUG_ON(sock_owned_by_user(sk));
1582 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1583 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1586 static inline void xs_reclassify_socket6(struct socket *sock)
1588 struct sock *sk = sock->sk;
1590 BUG_ON(sock_owned_by_user(sk));
1591 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1592 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1595 static inline void xs_reclassify_socket(int family, struct socket *sock)
1599 xs_reclassify_socket4(sock);
1602 xs_reclassify_socket6(sock);
1607 static inline void xs_reclassify_socket4(struct socket *sock)
1611 static inline void xs_reclassify_socket6(struct socket *sock)
1615 static inline void xs_reclassify_socket(int family, struct socket *sock)
1620 static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1621 struct sock_xprt *transport, int family, int type, int protocol)
1623 struct socket *sock;
1626 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1628 dprintk("RPC: can't create %d transport socket (%d).\n",
1632 transport->srcaddr.ss_family = family;
1633 xs_reclassify_socket(family, sock);
1635 if (xs_bind(transport, sock)) {
1642 return ERR_PTR(err);
1645 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1647 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1649 if (!transport->inet) {
1650 struct sock *sk = sock->sk;
1652 write_lock_bh(&sk->sk_callback_lock);
1654 xs_save_old_callbacks(transport, sk);
1656 sk->sk_user_data = xprt;
1657 sk->sk_data_ready = xs_udp_data_ready;
1658 sk->sk_write_space = xs_udp_write_space;
1659 sk->sk_error_report = xs_error_report;
1660 sk->sk_no_check = UDP_CSUM_NORCV;
1661 sk->sk_allocation = GFP_ATOMIC;
1663 xprt_set_connected(xprt);
1665 /* Reset to new socket */
1666 transport->sock = sock;
1667 transport->inet = sk;
1669 write_unlock_bh(&sk->sk_callback_lock);
1671 xs_udp_do_set_buffer_size(xprt);
1674 static void xs_udp_setup_socket(struct work_struct *work)
1676 struct sock_xprt *transport =
1677 container_of(work, struct sock_xprt, connect_worker.work);
1678 struct rpc_xprt *xprt = &transport->xprt;
1679 struct socket *sock = transport->sock;
1685 /* Start by resetting any existing state */
1686 xs_reset_transport(transport);
1687 sock = xs_create_sock(xprt, transport,
1688 xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
1692 dprintk("RPC: worker connecting xprt %p via %s to "
1693 "%s (port %s)\n", xprt,
1694 xprt->address_strings[RPC_DISPLAY_PROTO],
1695 xprt->address_strings[RPC_DISPLAY_ADDR],
1696 xprt->address_strings[RPC_DISPLAY_PORT]);
1698 xs_udp_finish_connecting(xprt, sock);
1701 xprt_clear_connecting(xprt);
1702 xprt_wake_pending_tasks(xprt, status);
1706 * We need to preserve the port number so the reply cache on the server can
1707 * find our cached RPC replies when we get around to reconnecting.
1709 static void xs_abort_connection(struct sock_xprt *transport)
1712 struct sockaddr any;
1714 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport);
1717 * Disconnect the transport socket by doing a connect operation
1718 * with AF_UNSPEC. This should return immediately...
1720 memset(&any, 0, sizeof(any));
1721 any.sa_family = AF_UNSPEC;
1722 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1724 xs_sock_mark_closed(&transport->xprt);
1726 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1730 static void xs_tcp_reuse_connection(struct sock_xprt *transport)
1732 unsigned int state = transport->inet->sk_state;
1734 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
1735 /* we don't need to abort the connection if the socket
1736 * hasn't undergone a shutdown
1738 if (transport->inet->sk_shutdown == 0)
1740 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
1741 __func__, transport->inet->sk_shutdown);
1743 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
1744 /* we don't need to abort the connection if the socket
1745 * hasn't undergone a shutdown
1747 if (transport->inet->sk_shutdown == 0)
1749 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
1750 "sk_shutdown set to %d\n",
1751 __func__, transport->inet->sk_shutdown);
1753 xs_abort_connection(transport);
1756 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1758 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1760 if (!transport->inet) {
1761 struct sock *sk = sock->sk;
1763 write_lock_bh(&sk->sk_callback_lock);
1765 xs_save_old_callbacks(transport, sk);
1767 sk->sk_user_data = xprt;
1768 sk->sk_data_ready = xs_tcp_data_ready;
1769 sk->sk_state_change = xs_tcp_state_change;
1770 sk->sk_write_space = xs_tcp_write_space;
1771 sk->sk_error_report = xs_error_report;
1772 sk->sk_allocation = GFP_ATOMIC;
1774 /* socket options */
1775 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1776 sock_reset_flag(sk, SOCK_LINGER);
1777 tcp_sk(sk)->linger2 = 0;
1778 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1780 xprt_clear_connected(xprt);
1782 /* Reset to new socket */
1783 transport->sock = sock;
1784 transport->inet = sk;
1786 write_unlock_bh(&sk->sk_callback_lock);
1789 if (!xprt_bound(xprt))
1792 /* Tell the socket layer to start connecting... */
1793 xprt->stat.connect_count++;
1794 xprt->stat.connect_start = jiffies;
1795 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1799 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
1800 * @xprt: RPC transport to connect
1801 * @transport: socket transport to connect
1802 * @create_sock: function to create a socket of the correct type
1804 * Invoked by a work queue tasklet.
1806 static void xs_tcp_setup_socket(struct work_struct *work)
1808 struct sock_xprt *transport =
1809 container_of(work, struct sock_xprt, connect_worker.work);
1810 struct socket *sock = transport->sock;
1811 struct rpc_xprt *xprt = &transport->xprt;
1818 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1819 sock = xs_create_sock(xprt, transport,
1820 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
1822 status = PTR_ERR(sock);
1828 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
1830 /* "close" the socket, preserving the local port */
1831 xs_tcp_reuse_connection(transport);
1837 dprintk("RPC: worker connecting xprt %p via %s to "
1838 "%s (port %s)\n", xprt,
1839 xprt->address_strings[RPC_DISPLAY_PROTO],
1840 xprt->address_strings[RPC_DISPLAY_ADDR],
1841 xprt->address_strings[RPC_DISPLAY_PORT]);
1843 status = xs_tcp_finish_connecting(xprt, sock);
1844 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1845 xprt, -status, xprt_connected(xprt),
1846 sock->sk->sk_state);
1849 printk("%s: connect returned unhandled error %d\n",
1851 case -EADDRNOTAVAIL:
1852 /* We're probably in TIME_WAIT. Get rid of existing socket,
1855 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1856 xprt_force_disconnect(xprt);
1861 /* retry with existing socket, after a delay */
1865 xprt_clear_connecting(xprt);
1868 /* Happens, for instance, if the user specified a link
1869 * local IPv6 address without a scope-id.
1876 xprt_clear_connecting(xprt);
1877 xprt_wake_pending_tasks(xprt, status);
1881 * xs_connect - connect a socket to a remote endpoint
1882 * @task: address of RPC task that manages state of connect request
1884 * TCP: If the remote end dropped the connection, delay reconnecting.
1886 * UDP socket connects are synchronous, but we use a work queue anyway
1887 * to guarantee that even unprivileged user processes can set up a
1888 * socket on a privileged port.
1890 * If a UDP socket connect fails, the delay behavior here prevents
1891 * retry floods (hard mounts).
1893 static void xs_connect(struct rpc_task *task)
1895 struct rpc_xprt *xprt = task->tk_xprt;
1896 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1898 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
1899 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1901 xprt, xprt->reestablish_timeout / HZ);
1902 queue_delayed_work(rpciod_workqueue,
1903 &transport->connect_worker,
1904 xprt->reestablish_timeout);
1905 xprt->reestablish_timeout <<= 1;
1906 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1907 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1908 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1909 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1911 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1912 queue_delayed_work(rpciod_workqueue,
1913 &transport->connect_worker, 0);
1918 * xs_udp_print_stats - display UDP socket-specifc stats
1919 * @xprt: rpc_xprt struct containing statistics
1923 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1925 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1927 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1929 xprt->stat.bind_count,
1932 xprt->stat.bad_xids,
1934 xprt->stat.bklog_u);
1938 * xs_tcp_print_stats - display TCP socket-specifc stats
1939 * @xprt: rpc_xprt struct containing statistics
1943 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1945 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1948 if (xprt_connected(xprt))
1949 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1951 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1953 xprt->stat.bind_count,
1954 xprt->stat.connect_count,
1955 xprt->stat.connect_time,
1959 xprt->stat.bad_xids,
1961 xprt->stat.bklog_u);
1965 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
1966 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
1967 * to use the server side send routines.
1969 static void *bc_malloc(struct rpc_task *task, size_t size)
1972 struct rpc_buffer *buf;
1974 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer));
1975 page = alloc_page(GFP_KERNEL);
1980 buf = page_address(page);
1981 buf->len = PAGE_SIZE;
1987 * Free the space allocated in the bc_alloc routine
1989 static void bc_free(void *buffer)
1991 struct rpc_buffer *buf;
1996 buf = container_of(buffer, struct rpc_buffer, data);
1997 free_page((unsigned long)buf);
2001 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2002 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2004 static int bc_sendto(struct rpc_rqst *req)
2007 struct xdr_buf *xbufp = &req->rq_snd_buf;
2008 struct rpc_xprt *xprt = req->rq_xprt;
2009 struct sock_xprt *transport =
2010 container_of(xprt, struct sock_xprt, xprt);
2011 struct socket *sock = transport->sock;
2012 unsigned long headoff;
2013 unsigned long tailoff;
2016 * Set up the rpc header and record marker stuff
2018 xs_encode_tcp_record_marker(xbufp);
2020 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2021 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2022 len = svc_send_common(sock, xbufp,
2023 virt_to_page(xbufp->head[0].iov_base), headoff,
2024 xbufp->tail[0].iov_base, tailoff);
2026 if (len != xbufp->len) {
2027 printk(KERN_NOTICE "Error sending entire callback!\n");
2035 * The send routine. Borrows from svc_send
2037 static int bc_send_request(struct rpc_task *task)
2039 struct rpc_rqst *req = task->tk_rqstp;
2040 struct svc_xprt *xprt;
2041 struct svc_sock *svsk;
2044 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2046 * Get the server socket associated with this callback xprt
2048 xprt = req->rq_xprt->bc_xprt;
2049 svsk = container_of(xprt, struct svc_sock, sk_xprt);
2052 * Grab the mutex to serialize data as the connection is shared
2053 * with the fore channel
2055 if (!mutex_trylock(&xprt->xpt_mutex)) {
2056 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2057 if (!mutex_trylock(&xprt->xpt_mutex))
2059 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2061 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2064 len = bc_sendto(req);
2065 mutex_unlock(&xprt->xpt_mutex);
2074 * The close routine. Since this is client initiated, we do nothing
2077 static void bc_close(struct rpc_xprt *xprt)
2082 * The xprt destroy routine. Again, because this connection is client
2083 * initiated, we do nothing
2086 static void bc_destroy(struct rpc_xprt *xprt)
2090 static struct rpc_xprt_ops xs_udp_ops = {
2091 .set_buffer_size = xs_udp_set_buffer_size,
2092 .reserve_xprt = xprt_reserve_xprt_cong,
2093 .release_xprt = xprt_release_xprt_cong,
2094 .rpcbind = rpcb_getport_async,
2095 .set_port = xs_set_port,
2096 .connect = xs_connect,
2097 .buf_alloc = rpc_malloc,
2098 .buf_free = rpc_free,
2099 .send_request = xs_udp_send_request,
2100 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2101 .timer = xs_udp_timer,
2102 .release_request = xprt_release_rqst_cong,
2104 .destroy = xs_destroy,
2105 .print_stats = xs_udp_print_stats,
2108 static struct rpc_xprt_ops xs_tcp_ops = {
2109 .reserve_xprt = xprt_reserve_xprt,
2110 .release_xprt = xs_tcp_release_xprt,
2111 .rpcbind = rpcb_getport_async,
2112 .set_port = xs_set_port,
2113 .connect = xs_connect,
2114 .buf_alloc = rpc_malloc,
2115 .buf_free = rpc_free,
2116 .send_request = xs_tcp_send_request,
2117 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2118 .close = xs_tcp_close,
2119 .destroy = xs_destroy,
2120 .print_stats = xs_tcp_print_stats,
2124 * The rpc_xprt_ops for the server backchannel
2127 static struct rpc_xprt_ops bc_tcp_ops = {
2128 .reserve_xprt = xprt_reserve_xprt,
2129 .release_xprt = xprt_release_xprt,
2130 .buf_alloc = bc_malloc,
2131 .buf_free = bc_free,
2132 .send_request = bc_send_request,
2133 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2135 .destroy = bc_destroy,
2136 .print_stats = xs_tcp_print_stats,
2139 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2140 unsigned int slot_table_size)
2142 struct rpc_xprt *xprt;
2143 struct sock_xprt *new;
2145 if (args->addrlen > sizeof(xprt->addr)) {
2146 dprintk("RPC: xs_setup_xprt: address too large\n");
2147 return ERR_PTR(-EBADF);
2150 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size);
2152 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2154 return ERR_PTR(-ENOMEM);
2157 new = container_of(xprt, struct sock_xprt, xprt);
2158 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2159 xprt->addrlen = args->addrlen;
2161 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2166 static const struct rpc_timeout xs_udp_default_timeout = {
2167 .to_initval = 5 * HZ,
2168 .to_maxval = 30 * HZ,
2169 .to_increment = 5 * HZ,
2174 * xs_setup_udp - Set up transport to use a UDP socket
2175 * @args: rpc transport creation arguments
2178 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2180 struct sockaddr *addr = args->dstaddr;
2181 struct rpc_xprt *xprt;
2182 struct sock_xprt *transport;
2183 struct rpc_xprt *ret;
2185 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
2188 transport = container_of(xprt, struct sock_xprt, xprt);
2190 xprt->prot = IPPROTO_UDP;
2192 /* XXX: header size can vary due to auth type, IPv6, etc. */
2193 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2195 xprt->bind_timeout = XS_BIND_TO;
2196 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2197 xprt->idle_timeout = XS_IDLE_DISC_TO;
2199 xprt->ops = &xs_udp_ops;
2201 xprt->timeout = &xs_udp_default_timeout;
2203 switch (addr->sa_family) {
2205 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2206 xprt_set_bound(xprt);
2208 INIT_DELAYED_WORK(&transport->connect_worker,
2209 xs_udp_setup_socket);
2210 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2213 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2214 xprt_set_bound(xprt);
2216 INIT_DELAYED_WORK(&transport->connect_worker,
2217 xs_udp_setup_socket);
2218 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2221 ret = ERR_PTR(-EAFNOSUPPORT);
2225 if (xprt_bound(xprt))
2226 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2227 xprt->address_strings[RPC_DISPLAY_ADDR],
2228 xprt->address_strings[RPC_DISPLAY_PORT],
2229 xprt->address_strings[RPC_DISPLAY_PROTO]);
2231 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2232 xprt->address_strings[RPC_DISPLAY_ADDR],
2233 xprt->address_strings[RPC_DISPLAY_PROTO]);
2235 if (try_module_get(THIS_MODULE))
2237 ret = ERR_PTR(-EINVAL);
2243 static const struct rpc_timeout xs_tcp_default_timeout = {
2244 .to_initval = 60 * HZ,
2245 .to_maxval = 60 * HZ,
2250 * xs_setup_tcp - Set up transport to use a TCP socket
2251 * @args: rpc transport creation arguments
2254 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2256 struct sockaddr *addr = args->dstaddr;
2257 struct rpc_xprt *xprt;
2258 struct sock_xprt *transport;
2259 struct rpc_xprt *ret;
2261 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2264 transport = container_of(xprt, struct sock_xprt, xprt);
2266 xprt->prot = IPPROTO_TCP;
2267 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2268 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2270 xprt->bind_timeout = XS_BIND_TO;
2271 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2272 xprt->idle_timeout = XS_IDLE_DISC_TO;
2274 xprt->ops = &xs_tcp_ops;
2275 xprt->timeout = &xs_tcp_default_timeout;
2277 switch (addr->sa_family) {
2279 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2280 xprt_set_bound(xprt);
2282 INIT_DELAYED_WORK(&transport->connect_worker,
2283 xs_tcp_setup_socket);
2284 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2287 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2288 xprt_set_bound(xprt);
2290 INIT_DELAYED_WORK(&transport->connect_worker,
2291 xs_tcp_setup_socket);
2292 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2295 ret = ERR_PTR(-EAFNOSUPPORT);
2299 if (xprt_bound(xprt))
2300 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2301 xprt->address_strings[RPC_DISPLAY_ADDR],
2302 xprt->address_strings[RPC_DISPLAY_PORT],
2303 xprt->address_strings[RPC_DISPLAY_PROTO]);
2305 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2306 xprt->address_strings[RPC_DISPLAY_ADDR],
2307 xprt->address_strings[RPC_DISPLAY_PROTO]);
2310 if (try_module_get(THIS_MODULE))
2312 ret = ERR_PTR(-EINVAL);
2319 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2320 * @args: rpc transport creation arguments
2323 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2325 struct sockaddr *addr = args->dstaddr;
2326 struct rpc_xprt *xprt;
2327 struct sock_xprt *transport;
2328 struct svc_sock *bc_sock;
2329 struct rpc_xprt *ret;
2331 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2334 transport = container_of(xprt, struct sock_xprt, xprt);
2336 xprt->prot = IPPROTO_TCP;
2337 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2338 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2339 xprt->timeout = &xs_tcp_default_timeout;
2342 xprt_set_bound(xprt);
2343 xprt->bind_timeout = 0;
2344 xprt->reestablish_timeout = 0;
2345 xprt->idle_timeout = 0;
2348 * The backchannel uses the same socket connection as the
2351 xprt->bc_xprt = args->bc_xprt;
2352 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2353 bc_sock->sk_bc_xprt = xprt;
2354 transport->sock = bc_sock->sk_sock;
2355 transport->inet = bc_sock->sk_sk;
2357 xprt->ops = &bc_tcp_ops;
2359 switch (addr->sa_family) {
2361 xs_format_peer_addresses(xprt, "tcp",
2365 xs_format_peer_addresses(xprt, "tcp",
2366 RPCBIND_NETID_TCP6);
2369 ret = ERR_PTR(-EAFNOSUPPORT);
2373 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2374 xprt->address_strings[RPC_DISPLAY_ADDR],
2375 xprt->address_strings[RPC_DISPLAY_PORT],
2376 xprt->address_strings[RPC_DISPLAY_PROTO]);
2379 * Since we don't want connections for the backchannel, we set
2380 * the xprt status to connected
2382 xprt_set_connected(xprt);
2385 if (try_module_get(THIS_MODULE))
2387 ret = ERR_PTR(-EINVAL);
2393 static struct xprt_class xs_udp_transport = {
2394 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2396 .owner = THIS_MODULE,
2397 .ident = XPRT_TRANSPORT_UDP,
2398 .setup = xs_setup_udp,
2401 static struct xprt_class xs_tcp_transport = {
2402 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2404 .owner = THIS_MODULE,
2405 .ident = XPRT_TRANSPORT_TCP,
2406 .setup = xs_setup_tcp,
2409 static struct xprt_class xs_bc_tcp_transport = {
2410 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
2411 .name = "tcp NFSv4.1 backchannel",
2412 .owner = THIS_MODULE,
2413 .ident = XPRT_TRANSPORT_BC_TCP,
2414 .setup = xs_setup_bc_tcp,
2418 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2421 int init_socket_xprt(void)
2424 if (!sunrpc_table_header)
2425 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2428 xprt_register_transport(&xs_udp_transport);
2429 xprt_register_transport(&xs_tcp_transport);
2430 xprt_register_transport(&xs_bc_tcp_transport);
2436 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2439 void cleanup_socket_xprt(void)
2442 if (sunrpc_table_header) {
2443 unregister_sysctl_table(sunrpc_table_header);
2444 sunrpc_table_header = NULL;
2448 xprt_unregister_transport(&xs_udp_transport);
2449 xprt_unregister_transport(&xs_tcp_transport);
2450 xprt_unregister_transport(&xs_bc_tcp_transport);
2453 static int param_set_uint_minmax(const char *val,
2454 const struct kernel_param *kp,
2455 unsigned int min, unsigned int max)
2462 ret = strict_strtoul(val, 0, &num);
2463 if (ret == -EINVAL || num < min || num > max)
2465 *((unsigned int *)kp->arg) = num;
2469 static int param_set_portnr(const char *val, const struct kernel_param *kp)
2471 return param_set_uint_minmax(val, kp,
2476 static struct kernel_param_ops param_ops_portnr = {
2477 .set = param_set_portnr,
2478 .get = param_get_uint,
2481 #define param_check_portnr(name, p) \
2482 __param_check(name, p, unsigned int);
2484 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
2485 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
2487 static int param_set_slot_table_size(const char *val,
2488 const struct kernel_param *kp)
2490 return param_set_uint_minmax(val, kp,
2492 RPC_MAX_SLOT_TABLE);
2495 static struct kernel_param_ops param_ops_slot_table_size = {
2496 .set = param_set_slot_table_size,
2497 .get = param_get_uint,
2500 #define param_check_slot_table_size(name, p) \
2501 __param_check(name, p, unsigned int);
2503 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
2504 slot_table_size, 0644);
2505 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
2506 slot_table_size, 0644);