2 * linux/net/sunrpc/xprtsock.c
4 * Client-side transport implementation for sockets.
6 * TCP callback races fixes (C) 1998 Red Hat
7 * TCP send fixes (C) 1998 Red Hat
8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
21 #include <linux/types.h>
22 #include <linux/string.h>
23 #include <linux/slab.h>
24 #include <linux/module.h>
25 #include <linux/capability.h>
26 #include <linux/pagemap.h>
27 #include <linux/errno.h>
28 #include <linux/socket.h>
30 #include <linux/net.h>
33 #include <linux/udp.h>
34 #include <linux/tcp.h>
35 #include <linux/sunrpc/clnt.h>
36 #include <linux/sunrpc/addr.h>
37 #include <linux/sunrpc/sched.h>
38 #include <linux/sunrpc/svcsock.h>
39 #include <linux/sunrpc/xprtsock.h>
40 #include <linux/file.h>
41 #ifdef CONFIG_SUNRPC_BACKCHANNEL
42 #include <linux/sunrpc/bc_xprt.h>
46 #include <net/checksum.h>
50 #include <trace/events/sunrpc.h>
54 static void xs_close(struct rpc_xprt *xprt);
59 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
60 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
61 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
63 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
64 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
66 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
68 #define XS_TCP_LINGER_TO (15U * HZ)
69 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
72 * We can register our own files under /proc/sys/sunrpc by
73 * calling register_sysctl_table() again. The files in that
74 * directory become the union of all files registered there.
76 * We simply need to make sure that we don't collide with
77 * someone else's file names!
80 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
81 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
82 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
83 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
84 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
86 static struct ctl_table_header *sunrpc_table_header;
89 * FIXME: changing the UDP slot table size should also resize the UDP
90 * socket buffers for existing UDP transports
92 static struct ctl_table xs_tunables_table[] = {
94 .procname = "udp_slot_table_entries",
95 .data = &xprt_udp_slot_table_entries,
96 .maxlen = sizeof(unsigned int),
98 .proc_handler = proc_dointvec_minmax,
99 .extra1 = &min_slot_table_size,
100 .extra2 = &max_slot_table_size
103 .procname = "tcp_slot_table_entries",
104 .data = &xprt_tcp_slot_table_entries,
105 .maxlen = sizeof(unsigned int),
107 .proc_handler = proc_dointvec_minmax,
108 .extra1 = &min_slot_table_size,
109 .extra2 = &max_slot_table_size
112 .procname = "tcp_max_slot_table_entries",
113 .data = &xprt_max_tcp_slot_table_entries,
114 .maxlen = sizeof(unsigned int),
116 .proc_handler = proc_dointvec_minmax,
117 .extra1 = &min_slot_table_size,
118 .extra2 = &max_tcp_slot_table_limit
121 .procname = "min_resvport",
122 .data = &xprt_min_resvport,
123 .maxlen = sizeof(unsigned int),
125 .proc_handler = proc_dointvec_minmax,
126 .extra1 = &xprt_min_resvport_limit,
127 .extra2 = &xprt_max_resvport
130 .procname = "max_resvport",
131 .data = &xprt_max_resvport,
132 .maxlen = sizeof(unsigned int),
134 .proc_handler = proc_dointvec_minmax,
135 .extra1 = &xprt_min_resvport,
136 .extra2 = &xprt_max_resvport_limit
139 .procname = "tcp_fin_timeout",
140 .data = &xs_tcp_fin_timeout,
141 .maxlen = sizeof(xs_tcp_fin_timeout),
143 .proc_handler = proc_dointvec_jiffies,
148 static struct ctl_table sunrpc_table[] = {
150 .procname = "sunrpc",
152 .child = xs_tunables_table
160 * Wait duration for a reply from the RPC portmapper.
162 #define XS_BIND_TO (60U * HZ)
165 * Delay if a UDP socket connect error occurs. This is most likely some
166 * kind of resource problem on the local host.
168 #define XS_UDP_REEST_TO (2U * HZ)
171 * The reestablish timeout allows clients to delay for a bit before attempting
172 * to reconnect to a server that just dropped our connection.
174 * We implement an exponential backoff when trying to reestablish a TCP
175 * transport connection with the server. Some servers like to drop a TCP
176 * connection when they are overworked, so we start with a short timeout and
177 * increase over time if the server is down or not responding.
179 #define XS_TCP_INIT_REEST_TO (3U * HZ)
182 * TCP idle timeout; client drops the transport socket if it is idle
183 * for this long. Note that we also timeout UDP sockets to prevent
184 * holding port numbers when there is no RPC traffic.
186 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
188 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
189 # undef RPC_DEBUG_DATA
190 # define RPCDBG_FACILITY RPCDBG_TRANS
193 #ifdef RPC_DEBUG_DATA
194 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
196 u8 *buf = (u8 *) packet;
199 dprintk("RPC: %s\n", msg);
200 for (j = 0; j < count && j < 128; j += 4) {
204 dprintk("0x%04x ", j);
206 dprintk("%02x%02x%02x%02x ",
207 buf[j], buf[j+1], buf[j+2], buf[j+3]);
212 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
218 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
220 return (struct rpc_xprt *) sk->sk_user_data;
223 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
225 return (struct sockaddr *) &xprt->addr;
228 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
230 return (struct sockaddr_un *) &xprt->addr;
233 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
235 return (struct sockaddr_in *) &xprt->addr;
238 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
240 return (struct sockaddr_in6 *) &xprt->addr;
243 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
245 struct sockaddr *sap = xs_addr(xprt);
246 struct sockaddr_in6 *sin6;
247 struct sockaddr_in *sin;
248 struct sockaddr_un *sun;
251 switch (sap->sa_family) {
253 sun = xs_addr_un(xprt);
254 strlcpy(buf, sun->sun_path, sizeof(buf));
255 xprt->address_strings[RPC_DISPLAY_ADDR] =
256 kstrdup(buf, GFP_KERNEL);
259 (void)rpc_ntop(sap, buf, sizeof(buf));
260 xprt->address_strings[RPC_DISPLAY_ADDR] =
261 kstrdup(buf, GFP_KERNEL);
262 sin = xs_addr_in(xprt);
263 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
266 (void)rpc_ntop(sap, buf, sizeof(buf));
267 xprt->address_strings[RPC_DISPLAY_ADDR] =
268 kstrdup(buf, GFP_KERNEL);
269 sin6 = xs_addr_in6(xprt);
270 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
276 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
279 static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
281 struct sockaddr *sap = xs_addr(xprt);
284 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
285 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
287 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
288 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
291 static void xs_format_peer_addresses(struct rpc_xprt *xprt,
292 const char *protocol,
295 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
296 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
297 xs_format_common_peer_addresses(xprt);
298 xs_format_common_peer_ports(xprt);
301 static void xs_update_peer_port(struct rpc_xprt *xprt)
303 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
304 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
306 xs_format_common_peer_ports(xprt);
309 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
313 for (i = 0; i < RPC_DISPLAY_MAX; i++)
315 case RPC_DISPLAY_PROTO:
316 case RPC_DISPLAY_NETID:
319 kfree(xprt->address_strings[i]);
323 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
325 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
327 struct msghdr msg = {
329 .msg_namelen = addrlen,
330 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
333 .iov_base = vec->iov_base + base,
334 .iov_len = vec->iov_len - base,
337 if (iov.iov_len != 0)
338 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
339 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
342 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p)
344 ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
345 int offset, size_t size, int flags);
347 unsigned int remainder;
350 remainder = xdr->page_len - base;
351 base += xdr->page_base;
352 ppage = xdr->pages + (base >> PAGE_SHIFT);
354 do_sendpage = sock->ops->sendpage;
356 do_sendpage = sock_no_sendpage;
358 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
359 int flags = XS_SENDMSG_FLAGS;
365 flags |= MSG_SENDPAGE_NOTLAST | MSG_MORE;
366 err = do_sendpage(sock, *ppage, base, len, flags);
367 if (remainder == 0 || err != len)
381 * xs_sendpages - write pages directly to a socket
382 * @sock: socket to send on
383 * @addr: UDP only -- address of destination
384 * @addrlen: UDP only -- length of destination address
385 * @xdr: buffer containing this request
386 * @base: starting position in the buffer
387 * @zerocopy: true if it is safe to use sendpage()
388 * @sent_p: return the total number of bytes successfully queued for sending
391 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy, int *sent_p)
393 unsigned int remainder = xdr->len - base;
405 if (base < xdr->head[0].iov_len || addr != NULL) {
406 unsigned int len = xdr->head[0].iov_len - base;
408 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
409 if (remainder == 0 || err != len)
414 base -= xdr->head[0].iov_len;
416 if (base < xdr->page_len) {
417 unsigned int len = xdr->page_len - base;
419 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent);
421 if (remainder == 0 || sent != len)
425 base -= xdr->page_len;
427 if (base >= xdr->tail[0].iov_len)
429 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
438 static void xs_nospace_callback(struct rpc_task *task)
440 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
442 transport->inet->sk_write_pending--;
446 * xs_nospace - place task on wait queue if transmit was incomplete
447 * @task: task to put to sleep
450 static int xs_nospace(struct rpc_task *task)
452 struct rpc_rqst *req = task->tk_rqstp;
453 struct rpc_xprt *xprt = req->rq_xprt;
454 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
455 struct sock *sk = transport->inet;
458 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
459 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
462 /* Protect against races with write_space */
463 spin_lock_bh(&xprt->transport_lock);
465 /* Don't race with disconnect */
466 if (xprt_connected(xprt)) {
467 /* wait for more buffer space */
468 sk->sk_write_pending++;
469 xprt_wait_for_buffer_space(task, xs_nospace_callback);
473 spin_unlock_bh(&xprt->transport_lock);
475 /* Race breaker in case memory is freed before above code is called */
476 sk->sk_write_space(sk);
481 * Construct a stream transport record marker in @buf.
483 static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
485 u32 reclen = buf->len - sizeof(rpc_fraghdr);
486 rpc_fraghdr *base = buf->head[0].iov_base;
487 *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
491 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
492 * @task: RPC task that manages the state of an RPC request
495 * 0: The request has been sent
496 * EAGAIN: The socket was blocked, please call again later to
497 * complete the request
498 * ENOTCONN: Caller needs to invoke connect logic then call again
499 * other: Some other error occured, the request was not sent
501 static int xs_local_send_request(struct rpc_task *task)
503 struct rpc_rqst *req = task->tk_rqstp;
504 struct rpc_xprt *xprt = req->rq_xprt;
505 struct sock_xprt *transport =
506 container_of(xprt, struct sock_xprt, xprt);
507 struct xdr_buf *xdr = &req->rq_snd_buf;
511 xs_encode_stream_record_marker(&req->rq_snd_buf);
513 xs_pktdump("packet data:",
514 req->rq_svec->iov_base, req->rq_svec->iov_len);
516 status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent,
518 dprintk("RPC: %s(%u) = %d\n",
519 __func__, xdr->len - req->rq_bytes_sent, status);
521 if (status == -EAGAIN && sock_writeable(transport->inet))
524 if (likely(sent > 0) || status == 0) {
525 req->rq_bytes_sent += sent;
526 req->rq_xmit_bytes_sent += sent;
527 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
528 req->rq_bytes_sent = 0;
538 status = xs_nospace(task);
541 dprintk("RPC: sendmsg returned unrecognized error %d\n",
552 * xs_udp_send_request - write an RPC request to a UDP socket
553 * @task: address of RPC task that manages the state of an RPC request
556 * 0: The request has been sent
557 * EAGAIN: The socket was blocked, please call again later to
558 * complete the request
559 * ENOTCONN: Caller needs to invoke connect logic then call again
560 * other: Some other error occurred, the request was not sent
562 static int xs_udp_send_request(struct rpc_task *task)
564 struct rpc_rqst *req = task->tk_rqstp;
565 struct rpc_xprt *xprt = req->rq_xprt;
566 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
567 struct xdr_buf *xdr = &req->rq_snd_buf;
571 xs_pktdump("packet data:",
572 req->rq_svec->iov_base,
573 req->rq_svec->iov_len);
575 if (!xprt_bound(xprt))
577 status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen,
578 xdr, req->rq_bytes_sent, true, &sent);
580 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
581 xdr->len - req->rq_bytes_sent, status);
583 /* firewall is blocking us, don't return -EAGAIN or we end up looping */
584 if (status == -EPERM)
587 if (status == -EAGAIN && sock_writeable(transport->inet))
590 if (sent > 0 || status == 0) {
591 req->rq_xmit_bytes_sent += sent;
592 if (sent >= req->rq_slen)
594 /* Still some bytes left; set up for a retry later. */
602 /* Should we call xs_close() here? */
605 status = xs_nospace(task);
612 /* When the server has died, an ICMP port unreachable message
613 * prompts ECONNREFUSED. */
616 dprintk("RPC: sendmsg returned unrecognized error %d\n",
624 * xs_tcp_send_request - write an RPC request to a TCP socket
625 * @task: address of RPC task that manages the state of an RPC request
628 * 0: The request has been sent
629 * EAGAIN: The socket was blocked, please call again later to
630 * complete the request
631 * ENOTCONN: Caller needs to invoke connect logic then call again
632 * other: Some other error occurred, the request was not sent
634 * XXX: In the case of soft timeouts, should we eventually give up
635 * if sendmsg is not able to make progress?
637 static int xs_tcp_send_request(struct rpc_task *task)
639 struct rpc_rqst *req = task->tk_rqstp;
640 struct rpc_xprt *xprt = req->rq_xprt;
641 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
642 struct xdr_buf *xdr = &req->rq_snd_buf;
643 bool zerocopy = true;
644 bool vm_wait = false;
648 xs_encode_stream_record_marker(&req->rq_snd_buf);
650 xs_pktdump("packet data:",
651 req->rq_svec->iov_base,
652 req->rq_svec->iov_len);
653 /* Don't use zero copy if this is a resend. If the RPC call
654 * completes while the socket holds a reference to the pages,
655 * then we may end up resending corrupted data.
657 if (task->tk_flags & RPC_TASK_SENT)
660 /* Continue transmitting the packet/record. We must be careful
661 * to cope with writespace callbacks arriving _after_ we have
662 * called sendmsg(). */
665 status = xs_sendpages(transport->sock, NULL, 0, xdr,
666 req->rq_bytes_sent, zerocopy, &sent);
668 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
669 xdr->len - req->rq_bytes_sent, status);
671 /* If we've sent the entire packet, immediately
672 * reset the count of bytes sent. */
673 req->rq_bytes_sent += sent;
674 req->rq_xmit_bytes_sent += sent;
675 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
676 req->rq_bytes_sent = 0;
680 WARN_ON_ONCE(sent == 0 && status == 0);
682 if (status == -EAGAIN ) {
684 * Return EAGAIN if we're sure we're hitting the
685 * socket send buffer limits.
687 if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
690 * Did we hit a memory allocation failure?
696 /* Retry, knowing now that we're below the
697 * socket send buffer limit
711 /* Should we call xs_close() here? */
714 status = xs_nospace(task);
724 dprintk("RPC: sendmsg returned unrecognized error %d\n",
732 * xs_tcp_release_xprt - clean up after a tcp transmission
736 * This cleans up if an error causes us to abort the transmission of a request.
737 * In this case, the socket may need to be reset in order to avoid confusing
740 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
742 struct rpc_rqst *req;
744 if (task != xprt->snd_task)
748 req = task->tk_rqstp;
751 if (req->rq_bytes_sent == 0)
753 if (req->rq_bytes_sent == req->rq_snd_buf.len)
755 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
757 xprt_release_xprt(xprt, task);
760 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
762 transport->old_data_ready = sk->sk_data_ready;
763 transport->old_state_change = sk->sk_state_change;
764 transport->old_write_space = sk->sk_write_space;
765 transport->old_error_report = sk->sk_error_report;
768 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
770 sk->sk_data_ready = transport->old_data_ready;
771 sk->sk_state_change = transport->old_state_change;
772 sk->sk_write_space = transport->old_write_space;
773 sk->sk_error_report = transport->old_error_report;
776 static void xs_sock_reset_state_flags(struct rpc_xprt *xprt)
778 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
780 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
783 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
785 smp_mb__before_atomic();
786 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
787 clear_bit(XPRT_CLOSING, &xprt->state);
788 xs_sock_reset_state_flags(xprt);
789 smp_mb__after_atomic();
792 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
794 xs_sock_reset_connection_flags(xprt);
795 /* Mark transport as closed and wake up all pending tasks */
796 xprt_disconnect_done(xprt);
800 * xs_error_report - callback to handle TCP socket state errors
803 * Note: we don't call sock_error() since there may be a rpc_task
804 * using the socket, and so we don't want to clear sk->sk_err.
806 static void xs_error_report(struct sock *sk)
808 struct rpc_xprt *xprt;
811 read_lock_bh(&sk->sk_callback_lock);
812 if (!(xprt = xprt_from_sock(sk)))
818 /* Is this a reset event? */
819 if (sk->sk_state == TCP_CLOSE)
820 xs_sock_mark_closed(xprt);
821 dprintk("RPC: xs_error_report client %p, error=%d...\n",
823 trace_rpc_socket_error(xprt, sk->sk_socket, err);
824 xprt_wake_pending_tasks(xprt, err);
826 read_unlock_bh(&sk->sk_callback_lock);
829 static void xs_reset_transport(struct sock_xprt *transport)
831 struct socket *sock = transport->sock;
832 struct sock *sk = transport->inet;
833 struct rpc_xprt *xprt = &transport->xprt;
838 if (atomic_read(&transport->xprt.swapper))
839 sk_clear_memalloc(sk);
841 kernel_sock_shutdown(sock, SHUT_RDWR);
843 mutex_lock(&transport->recv_mutex);
844 write_lock_bh(&sk->sk_callback_lock);
845 transport->inet = NULL;
846 transport->sock = NULL;
848 sk->sk_user_data = NULL;
850 xs_restore_old_callbacks(transport, sk);
851 xprt_clear_connected(xprt);
852 write_unlock_bh(&sk->sk_callback_lock);
853 xs_sock_reset_connection_flags(xprt);
854 mutex_unlock(&transport->recv_mutex);
856 trace_rpc_socket_close(xprt, sock);
861 * xs_close - close a socket
864 * This is used when all requests are complete; ie, no DRC state remains
865 * on the server we want to save.
867 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
868 * xs_reset_transport() zeroing the socket from underneath a writer.
870 static void xs_close(struct rpc_xprt *xprt)
872 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
874 dprintk("RPC: xs_close xprt %p\n", xprt);
876 xs_reset_transport(transport);
877 xprt->reestablish_timeout = 0;
879 xprt_disconnect_done(xprt);
882 static void xs_inject_disconnect(struct rpc_xprt *xprt)
884 dprintk("RPC: injecting transport disconnect on xprt=%p\n",
886 xprt_disconnect_done(xprt);
889 static void xs_xprt_free(struct rpc_xprt *xprt)
891 xs_free_peer_addresses(xprt);
896 * xs_destroy - prepare to shutdown a transport
897 * @xprt: doomed transport
900 static void xs_destroy(struct rpc_xprt *xprt)
902 struct sock_xprt *transport = container_of(xprt,
903 struct sock_xprt, xprt);
904 dprintk("RPC: xs_destroy xprt %p\n", xprt);
906 cancel_delayed_work_sync(&transport->connect_worker);
908 cancel_work_sync(&transport->recv_worker);
910 module_put(THIS_MODULE);
913 static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
915 struct xdr_skb_reader desc = {
917 .offset = sizeof(rpc_fraghdr),
918 .count = skb->len - sizeof(rpc_fraghdr),
921 if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
929 * xs_local_data_read_skb
934 * Currently this assumes we can read the whole reply in a single gulp.
936 static void xs_local_data_read_skb(struct rpc_xprt *xprt,
940 struct rpc_task *task;
941 struct rpc_rqst *rovr;
946 repsize = skb->len - sizeof(rpc_fraghdr);
948 dprintk("RPC: impossible RPC reply size %d\n", repsize);
952 /* Copy the XID from the skb... */
953 xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
957 /* Look up and lock the request corresponding to the given XID */
958 spin_lock_bh(&xprt->transport_lock);
959 rovr = xprt_lookup_rqst(xprt, *xp);
962 task = rovr->rq_task;
964 copied = rovr->rq_private_buf.buflen;
965 if (copied > repsize)
968 if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
969 dprintk("RPC: sk_buff copy failed\n");
973 xprt_complete_rqst(task, copied);
976 spin_unlock_bh(&xprt->transport_lock);
979 static void xs_local_data_receive(struct sock_xprt *transport)
985 mutex_lock(&transport->recv_mutex);
986 sk = transport->inet;
990 skb = skb_recv_datagram(sk, 0, 1, &err);
992 xs_local_data_read_skb(&transport->xprt, sk, skb);
993 skb_free_datagram(sk, skb);
996 if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1000 mutex_unlock(&transport->recv_mutex);
1003 static void xs_local_data_receive_workfn(struct work_struct *work)
1005 struct sock_xprt *transport =
1006 container_of(work, struct sock_xprt, recv_worker);
1007 xs_local_data_receive(transport);
1011 * xs_udp_data_read_skb - receive callback for UDP sockets
1017 static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
1019 struct sk_buff *skb)
1021 struct rpc_task *task;
1022 struct rpc_rqst *rovr;
1023 int repsize, copied;
1029 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
1033 /* Copy the XID from the skb... */
1034 xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
1038 /* Look up and lock the request corresponding to the given XID */
1039 spin_lock_bh(&xprt->transport_lock);
1040 rovr = xprt_lookup_rqst(xprt, *xp);
1043 task = rovr->rq_task;
1045 if ((copied = rovr->rq_private_buf.buflen) > repsize)
1048 /* Suck it into the iovec, verify checksum if not done by hw. */
1049 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1050 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1054 __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1056 xprt_adjust_cwnd(xprt, task, copied);
1057 xprt_complete_rqst(task, copied);
1060 spin_unlock_bh(&xprt->transport_lock);
1063 static void xs_udp_data_receive(struct sock_xprt *transport)
1065 struct sk_buff *skb;
1069 mutex_lock(&transport->recv_mutex);
1070 sk = transport->inet;
1074 skb = skb_recv_datagram(sk, 0, 1, &err);
1076 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1077 skb_free_datagram_locked(sk, skb);
1080 if (!test_and_clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1084 mutex_unlock(&transport->recv_mutex);
1087 static void xs_udp_data_receive_workfn(struct work_struct *work)
1089 struct sock_xprt *transport =
1090 container_of(work, struct sock_xprt, recv_worker);
1091 xs_udp_data_receive(transport);
1095 * xs_data_ready - "data ready" callback for UDP sockets
1096 * @sk: socket with data to read
1099 static void xs_data_ready(struct sock *sk)
1101 struct rpc_xprt *xprt;
1103 read_lock_bh(&sk->sk_callback_lock);
1104 dprintk("RPC: xs_data_ready...\n");
1105 xprt = xprt_from_sock(sk);
1107 struct sock_xprt *transport = container_of(xprt,
1108 struct sock_xprt, xprt);
1109 transport->old_data_ready(sk);
1110 /* Any data means we had a useful conversation, so
1111 * then we don't need to delay the next reconnect
1113 if (xprt->reestablish_timeout)
1114 xprt->reestablish_timeout = 0;
1115 if (!test_and_set_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1116 queue_work(xprtiod_workqueue, &transport->recv_worker);
1118 read_unlock_bh(&sk->sk_callback_lock);
1122 * Helper function to force a TCP close if the server is sending
1123 * junk and/or it has put us in CLOSE_WAIT
1125 static void xs_tcp_force_close(struct rpc_xprt *xprt)
1127 xprt_force_disconnect(xprt);
1130 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
1132 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1136 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1137 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
1138 used = xdr_skb_read_bits(desc, p, len);
1139 transport->tcp_offset += used;
1143 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1144 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
1145 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
1147 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
1148 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
1150 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
1151 transport->tcp_offset = 0;
1153 /* Sanity check of the record length */
1154 if (unlikely(transport->tcp_reclen < 8)) {
1155 dprintk("RPC: invalid TCP record fragment length\n");
1156 xs_tcp_force_close(xprt);
1159 dprintk("RPC: reading TCP record fragment of length %d\n",
1160 transport->tcp_reclen);
1163 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
1165 if (transport->tcp_offset == transport->tcp_reclen) {
1166 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
1167 transport->tcp_offset = 0;
1168 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1169 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1170 transport->tcp_flags |= TCP_RCV_COPY_XID;
1171 transport->tcp_copied = 0;
1176 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1181 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
1182 dprintk("RPC: reading XID (%Zu bytes)\n", len);
1183 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
1184 used = xdr_skb_read_bits(desc, p, len);
1185 transport->tcp_offset += used;
1188 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
1189 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
1190 transport->tcp_copied = 4;
1191 dprintk("RPC: reading %s XID %08x\n",
1192 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1194 ntohl(transport->tcp_xid));
1195 xs_tcp_check_fraghdr(transport);
1198 static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1199 struct xdr_skb_reader *desc)
1206 * We want transport->tcp_offset to be 8 at the end of this routine
1207 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1208 * When this function is called for the first time,
1209 * transport->tcp_offset is 4 (after having already read the xid).
1211 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
1212 len = sizeof(transport->tcp_calldir) - offset;
1213 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
1214 p = ((char *) &transport->tcp_calldir) + offset;
1215 used = xdr_skb_read_bits(desc, p, len);
1216 transport->tcp_offset += used;
1219 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
1221 * We don't yet have the XDR buffer, so we will write the calldir
1222 * out after we get the buffer from the 'struct rpc_rqst'
1224 switch (ntohl(transport->tcp_calldir)) {
1226 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1227 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1228 transport->tcp_flags |= TCP_RPC_REPLY;
1231 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1232 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1233 transport->tcp_flags &= ~TCP_RPC_REPLY;
1236 dprintk("RPC: invalid request message type\n");
1237 xs_tcp_force_close(&transport->xprt);
1239 xs_tcp_check_fraghdr(transport);
1242 static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1243 struct xdr_skb_reader *desc,
1244 struct rpc_rqst *req)
1246 struct sock_xprt *transport =
1247 container_of(xprt, struct sock_xprt, xprt);
1248 struct xdr_buf *rcvbuf;
1252 rcvbuf = &req->rq_private_buf;
1254 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1256 * Save the RPC direction in the XDR buffer
1258 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
1259 &transport->tcp_calldir,
1260 sizeof(transport->tcp_calldir));
1261 transport->tcp_copied += sizeof(transport->tcp_calldir);
1262 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1266 if (len > transport->tcp_reclen - transport->tcp_offset) {
1267 struct xdr_skb_reader my_desc;
1269 len = transport->tcp_reclen - transport->tcp_offset;
1270 memcpy(&my_desc, desc, sizeof(my_desc));
1271 my_desc.count = len;
1272 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1273 &my_desc, xdr_skb_read_bits);
1277 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1278 desc, xdr_skb_read_bits);
1281 transport->tcp_copied += r;
1282 transport->tcp_offset += r;
1285 /* Error when copying to the receive buffer,
1286 * usually because we weren't able to allocate
1287 * additional buffer pages. All we can do now
1288 * is turn off TCP_RCV_COPY_DATA, so the request
1289 * will not receive any additional updates,
1291 * Any remaining data from this record will
1294 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1295 dprintk("RPC: XID %08x truncated request\n",
1296 ntohl(transport->tcp_xid));
1297 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1298 "tcp_offset = %u, tcp_reclen = %u\n",
1299 xprt, transport->tcp_copied,
1300 transport->tcp_offset, transport->tcp_reclen);
1304 dprintk("RPC: XID %08x read %Zd bytes\n",
1305 ntohl(transport->tcp_xid), r);
1306 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1307 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1308 transport->tcp_offset, transport->tcp_reclen);
1310 if (transport->tcp_copied == req->rq_private_buf.buflen)
1311 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1312 else if (transport->tcp_offset == transport->tcp_reclen) {
1313 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1314 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1319 * Finds the request corresponding to the RPC xid and invokes the common
1320 * tcp read code to read the data.
1322 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1323 struct xdr_skb_reader *desc)
1325 struct sock_xprt *transport =
1326 container_of(xprt, struct sock_xprt, xprt);
1327 struct rpc_rqst *req;
1329 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1331 /* Find and lock the request corresponding to this xid */
1332 spin_lock_bh(&xprt->transport_lock);
1333 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1335 dprintk("RPC: XID %08x request not found!\n",
1336 ntohl(transport->tcp_xid));
1337 spin_unlock_bh(&xprt->transport_lock);
1341 xs_tcp_read_common(xprt, desc, req);
1343 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1344 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1346 spin_unlock_bh(&xprt->transport_lock);
1350 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1352 * Obtains an rpc_rqst previously allocated and invokes the common
1353 * tcp read code to read the data. The result is placed in the callback
1355 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1356 * connection and return -1.
1358 static int xs_tcp_read_callback(struct rpc_xprt *xprt,
1359 struct xdr_skb_reader *desc)
1361 struct sock_xprt *transport =
1362 container_of(xprt, struct sock_xprt, xprt);
1363 struct rpc_rqst *req;
1365 /* Look up and lock the request corresponding to the given XID */
1366 spin_lock_bh(&xprt->transport_lock);
1367 req = xprt_lookup_bc_request(xprt, transport->tcp_xid);
1369 spin_unlock_bh(&xprt->transport_lock);
1370 printk(KERN_WARNING "Callback slot table overflowed\n");
1371 xprt_force_disconnect(xprt);
1375 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1376 xs_tcp_read_common(xprt, desc, req);
1378 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1379 xprt_complete_bc_request(req, transport->tcp_copied);
1380 spin_unlock_bh(&xprt->transport_lock);
1385 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1386 struct xdr_skb_reader *desc)
1388 struct sock_xprt *transport =
1389 container_of(xprt, struct sock_xprt, xprt);
1391 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1392 xs_tcp_read_reply(xprt, desc) :
1393 xs_tcp_read_callback(xprt, desc);
1396 static int xs_tcp_bc_up(struct svc_serv *serv, struct net *net)
1400 ret = svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0,
1401 SVC_SOCK_ANONYMOUS);
1407 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1412 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1413 struct xdr_skb_reader *desc)
1415 return xs_tcp_read_reply(xprt, desc);
1417 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1420 * Read data off the transport. This can be either an RPC_CALL or an
1421 * RPC_REPLY. Relay the processing to helper functions.
1423 static void xs_tcp_read_data(struct rpc_xprt *xprt,
1424 struct xdr_skb_reader *desc)
1426 struct sock_xprt *transport =
1427 container_of(xprt, struct sock_xprt, xprt);
1429 if (_xs_tcp_read_data(xprt, desc) == 0)
1430 xs_tcp_check_fraghdr(transport);
1433 * The transport_lock protects the request handling.
1434 * There's no need to hold it to update the tcp_flags.
1436 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1440 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1444 len = transport->tcp_reclen - transport->tcp_offset;
1445 if (len > desc->count)
1448 desc->offset += len;
1449 transport->tcp_offset += len;
1450 dprintk("RPC: discarded %Zu bytes\n", len);
1451 xs_tcp_check_fraghdr(transport);
1454 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1456 struct rpc_xprt *xprt = rd_desc->arg.data;
1457 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1458 struct xdr_skb_reader desc = {
1464 dprintk("RPC: xs_tcp_data_recv started\n");
1466 trace_xs_tcp_data_recv(transport);
1467 /* Read in a new fragment marker if necessary */
1468 /* Can we ever really expect to get completely empty fragments? */
1469 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1470 xs_tcp_read_fraghdr(xprt, &desc);
1473 /* Read in the xid if necessary */
1474 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1475 xs_tcp_read_xid(transport, &desc);
1478 /* Read in the call/reply flag */
1479 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1480 xs_tcp_read_calldir(transport, &desc);
1483 /* Read in the request data */
1484 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1485 xs_tcp_read_data(xprt, &desc);
1488 /* Skip over any trailing bytes on short reads */
1489 xs_tcp_read_discard(transport, &desc);
1490 } while (desc.count);
1491 trace_xs_tcp_data_recv(transport);
1492 dprintk("RPC: xs_tcp_data_recv done\n");
1493 return len - desc.count;
1496 static void xs_tcp_data_receive(struct sock_xprt *transport)
1498 struct rpc_xprt *xprt = &transport->xprt;
1500 read_descriptor_t rd_desc = {
1501 .count = 2*1024*1024,
1504 unsigned long total = 0;
1507 mutex_lock(&transport->recv_mutex);
1508 sk = transport->inet;
1512 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1515 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1517 clear_bit(XPRT_SOCK_DATA_READY, &transport->sock_state);
1519 if (!test_bit(XPRT_SOCK_DATA_READY, &transport->sock_state))
1525 rd_desc.count = 65536;
1528 mutex_unlock(&transport->recv_mutex);
1529 trace_xs_tcp_data_ready(xprt, read, total);
1532 static void xs_tcp_data_receive_workfn(struct work_struct *work)
1534 struct sock_xprt *transport =
1535 container_of(work, struct sock_xprt, recv_worker);
1536 xs_tcp_data_receive(transport);
1540 * xs_tcp_state_change - callback to handle TCP socket state changes
1541 * @sk: socket whose state has changed
1544 static void xs_tcp_state_change(struct sock *sk)
1546 struct rpc_xprt *xprt;
1547 struct sock_xprt *transport;
1549 read_lock_bh(&sk->sk_callback_lock);
1550 if (!(xprt = xprt_from_sock(sk)))
1552 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1553 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1554 sk->sk_state, xprt_connected(xprt),
1555 sock_flag(sk, SOCK_DEAD),
1556 sock_flag(sk, SOCK_ZAPPED),
1559 transport = container_of(xprt, struct sock_xprt, xprt);
1560 trace_rpc_socket_state_change(xprt, sk->sk_socket);
1561 switch (sk->sk_state) {
1562 case TCP_ESTABLISHED:
1563 spin_lock(&xprt->transport_lock);
1564 if (!xprt_test_and_set_connected(xprt)) {
1566 /* Reset TCP record info */
1567 transport->tcp_offset = 0;
1568 transport->tcp_reclen = 0;
1569 transport->tcp_copied = 0;
1570 transport->tcp_flags =
1571 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1572 xprt->connect_cookie++;
1573 clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1574 xprt_clear_connecting(xprt);
1576 xprt_wake_pending_tasks(xprt, -EAGAIN);
1578 spin_unlock(&xprt->transport_lock);
1581 /* The client initiated a shutdown of the socket */
1582 xprt->connect_cookie++;
1583 xprt->reestablish_timeout = 0;
1584 set_bit(XPRT_CLOSING, &xprt->state);
1585 smp_mb__before_atomic();
1586 clear_bit(XPRT_CONNECTED, &xprt->state);
1587 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1588 smp_mb__after_atomic();
1590 case TCP_CLOSE_WAIT:
1591 /* The server initiated a shutdown of the socket */
1592 xprt->connect_cookie++;
1593 clear_bit(XPRT_CONNECTED, &xprt->state);
1594 xs_tcp_force_close(xprt);
1597 * If the server closed down the connection, make sure that
1598 * we back off before reconnecting
1600 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1601 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1604 set_bit(XPRT_CLOSING, &xprt->state);
1605 smp_mb__before_atomic();
1606 clear_bit(XPRT_CONNECTED, &xprt->state);
1607 smp_mb__after_atomic();
1610 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1611 &transport->sock_state))
1612 xprt_clear_connecting(xprt);
1613 xs_sock_mark_closed(xprt);
1616 read_unlock_bh(&sk->sk_callback_lock);
1619 static void xs_write_space(struct sock *sk)
1621 struct socket_wq *wq;
1622 struct rpc_xprt *xprt;
1626 clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1628 if (unlikely(!(xprt = xprt_from_sock(sk))))
1631 wq = rcu_dereference(sk->sk_wq);
1632 if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
1635 xprt_write_space(xprt);
1641 * xs_udp_write_space - callback invoked when socket buffer space
1643 * @sk: socket whose state has changed
1645 * Called when more output buffer space is available for this socket.
1646 * We try not to wake our writers until they can make "significant"
1647 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1648 * with a bunch of small requests.
1650 static void xs_udp_write_space(struct sock *sk)
1652 read_lock_bh(&sk->sk_callback_lock);
1654 /* from net/core/sock.c:sock_def_write_space */
1655 if (sock_writeable(sk))
1658 read_unlock_bh(&sk->sk_callback_lock);
1662 * xs_tcp_write_space - callback invoked when socket buffer space
1664 * @sk: socket whose state has changed
1666 * Called when more output buffer space is available for this socket.
1667 * We try not to wake our writers until they can make "significant"
1668 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1669 * with a bunch of small requests.
1671 static void xs_tcp_write_space(struct sock *sk)
1673 read_lock_bh(&sk->sk_callback_lock);
1675 /* from net/core/stream.c:sk_stream_write_space */
1676 if (sk_stream_is_writeable(sk))
1679 read_unlock_bh(&sk->sk_callback_lock);
1682 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1684 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1685 struct sock *sk = transport->inet;
1687 if (transport->rcvsize) {
1688 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1689 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1691 if (transport->sndsize) {
1692 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1693 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1694 sk->sk_write_space(sk);
1699 * xs_udp_set_buffer_size - set send and receive limits
1700 * @xprt: generic transport
1701 * @sndsize: requested size of send buffer, in bytes
1702 * @rcvsize: requested size of receive buffer, in bytes
1704 * Set socket send and receive buffer size limits.
1706 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1708 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1710 transport->sndsize = 0;
1712 transport->sndsize = sndsize + 1024;
1713 transport->rcvsize = 0;
1715 transport->rcvsize = rcvsize + 1024;
1717 xs_udp_do_set_buffer_size(xprt);
1721 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1722 * @task: task that timed out
1724 * Adjust the congestion window after a retransmit timeout has occurred.
1726 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1728 xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1731 static unsigned short xs_get_random_port(void)
1733 unsigned short range = xprt_max_resvport - xprt_min_resvport + 1;
1734 unsigned short rand = (unsigned short) prandom_u32() % range;
1735 return rand + xprt_min_resvport;
1739 * xs_set_reuseaddr_port - set the socket's port and address reuse options
1742 * Note that this function has to be called on all sockets that share the
1743 * same port, and it must be called before binding.
1745 static void xs_sock_set_reuseport(struct socket *sock)
1749 kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT,
1750 (char *)&opt, sizeof(opt));
1753 static unsigned short xs_sock_getport(struct socket *sock)
1755 struct sockaddr_storage buf;
1757 unsigned short port = 0;
1759 if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 0)
1761 switch (buf.ss_family) {
1763 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1766 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1773 * xs_set_port - reset the port number in the remote endpoint address
1774 * @xprt: generic transport
1775 * @port: new port number
1778 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1780 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1782 rpc_set_port(xs_addr(xprt), port);
1783 xs_update_peer_port(xprt);
1786 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1788 if (transport->srcport == 0)
1789 transport->srcport = xs_sock_getport(sock);
1792 static unsigned short xs_get_srcport(struct sock_xprt *transport)
1794 unsigned short port = transport->srcport;
1796 if (port == 0 && transport->xprt.resvport)
1797 port = xs_get_random_port();
1801 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1803 if (transport->srcport != 0)
1804 transport->srcport = 0;
1805 if (!transport->xprt.resvport)
1807 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1808 return xprt_max_resvport;
1811 static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1813 struct sockaddr_storage myaddr;
1815 unsigned short port = xs_get_srcport(transport);
1816 unsigned short last;
1819 * If we are asking for any ephemeral port (i.e. port == 0 &&
1820 * transport->xprt.resvport == 0), don't bind. Let the local
1821 * port selection happen implicitly when the socket is used
1822 * (for example at connect time).
1824 * This ensures that we can continue to establish TCP
1825 * connections even when all local ephemeral ports are already
1826 * a part of some TCP connection. This makes no difference
1827 * for UDP sockets, but also doens't harm them.
1829 * If we're asking for any reserved port (i.e. port == 0 &&
1830 * transport->xprt.resvport == 1) xs_get_srcport above will
1831 * ensure that port is non-zero and we will bind as needed.
1836 memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1838 rpc_set_port((struct sockaddr *)&myaddr, port);
1839 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1840 transport->xprt.addrlen);
1842 transport->srcport = port;
1846 port = xs_next_srcport(transport, port);
1849 } while (err == -EADDRINUSE && nloop != 2);
1851 if (myaddr.ss_family == AF_INET)
1852 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__,
1853 &((struct sockaddr_in *)&myaddr)->sin_addr,
1854 port, err ? "failed" : "ok", err);
1856 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__,
1857 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1858 port, err ? "failed" : "ok", err);
1863 * We don't support autobind on AF_LOCAL sockets
1865 static void xs_local_rpcbind(struct rpc_task *task)
1867 xprt_set_bound(task->tk_xprt);
1870 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1874 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1875 static struct lock_class_key xs_key[2];
1876 static struct lock_class_key xs_slock_key[2];
1878 static inline void xs_reclassify_socketu(struct socket *sock)
1880 struct sock *sk = sock->sk;
1882 sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1883 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1886 static inline void xs_reclassify_socket4(struct socket *sock)
1888 struct sock *sk = sock->sk;
1890 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1891 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1894 static inline void xs_reclassify_socket6(struct socket *sock)
1896 struct sock *sk = sock->sk;
1898 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1899 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1902 static inline void xs_reclassify_socket(int family, struct socket *sock)
1904 if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1909 xs_reclassify_socketu(sock);
1912 xs_reclassify_socket4(sock);
1915 xs_reclassify_socket6(sock);
1920 static inline void xs_reclassify_socket(int family, struct socket *sock)
1925 static void xs_dummy_setup_socket(struct work_struct *work)
1929 static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1930 struct sock_xprt *transport, int family, int type,
1931 int protocol, bool reuseport)
1933 struct socket *sock;
1936 err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1938 dprintk("RPC: can't create %d transport socket (%d).\n",
1942 xs_reclassify_socket(family, sock);
1945 xs_sock_set_reuseport(sock);
1947 err = xs_bind(transport, sock);
1955 return ERR_PTR(err);
1958 static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1959 struct socket *sock)
1961 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1964 if (!transport->inet) {
1965 struct sock *sk = sock->sk;
1967 write_lock_bh(&sk->sk_callback_lock);
1969 xs_save_old_callbacks(transport, sk);
1971 sk->sk_user_data = xprt;
1972 sk->sk_data_ready = xs_data_ready;
1973 sk->sk_write_space = xs_udp_write_space;
1974 sock_set_flag(sk, SOCK_FASYNC);
1975 sk->sk_error_report = xs_error_report;
1976 sk->sk_allocation = GFP_NOIO;
1978 xprt_clear_connected(xprt);
1980 /* Reset to new socket */
1981 transport->sock = sock;
1982 transport->inet = sk;
1984 write_unlock_bh(&sk->sk_callback_lock);
1987 /* Tell the socket layer to start connecting... */
1988 xprt->stat.connect_count++;
1989 xprt->stat.connect_start = jiffies;
1990 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1994 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1995 * @transport: socket transport to connect
1997 static int xs_local_setup_socket(struct sock_xprt *transport)
1999 struct rpc_xprt *xprt = &transport->xprt;
2000 struct socket *sock;
2003 status = __sock_create(xprt->xprt_net, AF_LOCAL,
2004 SOCK_STREAM, 0, &sock, 1);
2006 dprintk("RPC: can't create AF_LOCAL "
2007 "transport socket (%d).\n", -status);
2010 xs_reclassify_socket(AF_LOCAL, sock);
2012 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
2013 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2015 status = xs_local_finish_connecting(xprt, sock);
2016 trace_rpc_socket_connect(xprt, sock, status);
2019 dprintk("RPC: xprt %p connected to %s\n",
2020 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2021 xprt_set_connected(xprt);
2025 dprintk("RPC: xprt %p: socket %s does not exist\n",
2026 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2029 dprintk("RPC: xprt %p: connection refused for %s\n",
2030 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2033 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
2035 xprt->address_strings[RPC_DISPLAY_ADDR]);
2039 xprt_clear_connecting(xprt);
2040 xprt_wake_pending_tasks(xprt, status);
2044 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2046 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2049 if (RPC_IS_ASYNC(task)) {
2051 * We want the AF_LOCAL connect to be resolved in the
2052 * filesystem namespace of the process making the rpc
2053 * call. Thus we connect synchronously.
2055 * If we want to support asynchronous AF_LOCAL calls,
2056 * we'll need to figure out how to pass a namespace to
2059 rpc_exit(task, -ENOTCONN);
2062 ret = xs_local_setup_socket(transport);
2063 if (ret && !RPC_IS_SOFTCONN(task))
2064 msleep_interruptible(15000);
2067 #if IS_ENABLED(CONFIG_SUNRPC_SWAP)
2069 * Note that this should be called with XPRT_LOCKED held (or when we otherwise
2070 * know that we have exclusive access to the socket), to guard against
2071 * races with xs_reset_transport.
2073 static void xs_set_memalloc(struct rpc_xprt *xprt)
2075 struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2079 * If there's no sock, then we have nothing to set. The
2080 * reconnecting process will get it for us.
2082 if (!transport->inet)
2084 if (atomic_read(&xprt->swapper))
2085 sk_set_memalloc(transport->inet);
2089 * xs_enable_swap - Tag this transport as being used for swap.
2090 * @xprt: transport to tag
2092 * Take a reference to this transport on behalf of the rpc_clnt, and
2093 * optionally mark it for swapping if it wasn't already.
2096 xs_enable_swap(struct rpc_xprt *xprt)
2098 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2100 if (atomic_inc_return(&xprt->swapper) != 1)
2102 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2103 return -ERESTARTSYS;
2105 sk_set_memalloc(xs->inet);
2106 xprt_release_xprt(xprt, NULL);
2111 * xs_disable_swap - Untag this transport as being used for swap.
2112 * @xprt: transport to tag
2114 * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
2115 * swapper refcount goes to 0, untag the socket as a memalloc socket.
2118 xs_disable_swap(struct rpc_xprt *xprt)
2120 struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2122 if (!atomic_dec_and_test(&xprt->swapper))
2124 if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2127 sk_clear_memalloc(xs->inet);
2128 xprt_release_xprt(xprt, NULL);
2131 static void xs_set_memalloc(struct rpc_xprt *xprt)
2136 xs_enable_swap(struct rpc_xprt *xprt)
2142 xs_disable_swap(struct rpc_xprt *xprt)
2147 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2149 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2151 if (!transport->inet) {
2152 struct sock *sk = sock->sk;
2154 write_lock_bh(&sk->sk_callback_lock);
2156 xs_save_old_callbacks(transport, sk);
2158 sk->sk_user_data = xprt;
2159 sk->sk_data_ready = xs_data_ready;
2160 sk->sk_write_space = xs_udp_write_space;
2161 sock_set_flag(sk, SOCK_FASYNC);
2162 sk->sk_allocation = GFP_NOIO;
2164 xprt_set_connected(xprt);
2166 /* Reset to new socket */
2167 transport->sock = sock;
2168 transport->inet = sk;
2170 xs_set_memalloc(xprt);
2172 write_unlock_bh(&sk->sk_callback_lock);
2174 xs_udp_do_set_buffer_size(xprt);
2176 xprt->stat.connect_start = jiffies;
2179 static void xs_udp_setup_socket(struct work_struct *work)
2181 struct sock_xprt *transport =
2182 container_of(work, struct sock_xprt, connect_worker.work);
2183 struct rpc_xprt *xprt = &transport->xprt;
2184 struct socket *sock = transport->sock;
2187 sock = xs_create_sock(xprt, transport,
2188 xs_addr(xprt)->sa_family, SOCK_DGRAM,
2189 IPPROTO_UDP, false);
2193 dprintk("RPC: worker connecting xprt %p via %s to "
2194 "%s (port %s)\n", xprt,
2195 xprt->address_strings[RPC_DISPLAY_PROTO],
2196 xprt->address_strings[RPC_DISPLAY_ADDR],
2197 xprt->address_strings[RPC_DISPLAY_PORT]);
2199 xs_udp_finish_connecting(xprt, sock);
2200 trace_rpc_socket_connect(xprt, sock, 0);
2203 xprt_unlock_connect(xprt, transport);
2204 xprt_clear_connecting(xprt);
2205 xprt_wake_pending_tasks(xprt, status);
2209 * xs_tcp_shutdown - gracefully shut down a TCP socket
2212 * Initiates a graceful shutdown of the TCP socket by calling the
2213 * equivalent of shutdown(SHUT_RDWR);
2215 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2217 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2218 struct socket *sock = transport->sock;
2222 if (xprt_connected(xprt)) {
2223 kernel_sock_shutdown(sock, SHUT_RDWR);
2224 trace_rpc_socket_shutdown(xprt, sock);
2226 xs_reset_transport(transport);
2229 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2231 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2232 int ret = -ENOTCONN;
2234 if (!transport->inet) {
2235 struct sock *sk = sock->sk;
2236 unsigned int keepidle = xprt->timeout->to_initval / HZ;
2237 unsigned int keepcnt = xprt->timeout->to_retries + 1;
2238 unsigned int opt_on = 1;
2240 unsigned int addr_pref = IPV6_PREFER_SRC_PUBLIC;
2242 /* TCP Keepalive options */
2243 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
2244 (char *)&opt_on, sizeof(opt_on));
2245 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
2246 (char *)&keepidle, sizeof(keepidle));
2247 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
2248 (char *)&keepidle, sizeof(keepidle));
2249 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
2250 (char *)&keepcnt, sizeof(keepcnt));
2252 /* Avoid temporary address, they are bad for long-lived
2253 * connections such as NFS mounts.
2254 * RFC4941, section 3.6 suggests that:
2255 * Individual applications, which have specific
2256 * knowledge about the normal duration of connections,
2257 * MAY override this as appropriate.
2259 kernel_setsockopt(sock, SOL_IPV6, IPV6_ADDR_PREFERENCES,
2260 (char *)&addr_pref, sizeof(addr_pref));
2262 /* TCP user timeout (see RFC5482) */
2263 timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2264 (xprt->timeout->to_retries + 1);
2265 kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT,
2266 (char *)&timeo, sizeof(timeo));
2268 write_lock_bh(&sk->sk_callback_lock);
2270 xs_save_old_callbacks(transport, sk);
2272 sk->sk_user_data = xprt;
2273 sk->sk_data_ready = xs_data_ready;
2274 sk->sk_state_change = xs_tcp_state_change;
2275 sk->sk_write_space = xs_tcp_write_space;
2276 sock_set_flag(sk, SOCK_FASYNC);
2277 sk->sk_error_report = xs_error_report;
2278 sk->sk_allocation = GFP_NOIO;
2280 /* socket options */
2281 sock_reset_flag(sk, SOCK_LINGER);
2282 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2284 xprt_clear_connected(xprt);
2286 /* Reset to new socket */
2287 transport->sock = sock;
2288 transport->inet = sk;
2290 write_unlock_bh(&sk->sk_callback_lock);
2293 if (!xprt_bound(xprt))
2296 xs_set_memalloc(xprt);
2298 /* Tell the socket layer to start connecting... */
2299 xprt->stat.connect_count++;
2300 xprt->stat.connect_start = jiffies;
2301 set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2302 ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2305 xs_set_srcport(transport, sock);
2308 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2309 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2311 case -EADDRNOTAVAIL:
2312 /* Source port number is unavailable. Try a new one! */
2313 transport->srcport = 0;
2320 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2322 * Invoked by a work queue tasklet.
2324 static void xs_tcp_setup_socket(struct work_struct *work)
2326 struct sock_xprt *transport =
2327 container_of(work, struct sock_xprt, connect_worker.work);
2328 struct socket *sock = transport->sock;
2329 struct rpc_xprt *xprt = &transport->xprt;
2333 sock = xs_create_sock(xprt, transport,
2334 xs_addr(xprt)->sa_family, SOCK_STREAM,
2337 status = PTR_ERR(sock);
2342 dprintk("RPC: worker connecting xprt %p via %s to "
2343 "%s (port %s)\n", xprt,
2344 xprt->address_strings[RPC_DISPLAY_PROTO],
2345 xprt->address_strings[RPC_DISPLAY_ADDR],
2346 xprt->address_strings[RPC_DISPLAY_PORT]);
2348 status = xs_tcp_finish_connecting(xprt, sock);
2349 trace_rpc_socket_connect(xprt, sock, status);
2350 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2351 xprt, -status, xprt_connected(xprt),
2352 sock->sk->sk_state);
2355 printk("%s: connect returned unhandled error %d\n",
2357 case -EADDRNOTAVAIL:
2358 /* We're probably in TIME_WAIT. Get rid of existing socket,
2361 xs_tcp_force_close(xprt);
2366 xprt_unlock_connect(xprt, transport);
2369 /* Happens, for instance, if the user specified a link
2370 * local IPv6 address without a scope-id.
2377 /* retry with existing socket, after a delay */
2378 xs_tcp_force_close(xprt);
2383 xprt_unlock_connect(xprt, transport);
2384 xprt_clear_connecting(xprt);
2385 xprt_wake_pending_tasks(xprt, status);
2388 static unsigned long xs_reconnect_delay(const struct rpc_xprt *xprt)
2390 unsigned long start, now = jiffies;
2392 start = xprt->stat.connect_start + xprt->reestablish_timeout;
2393 if (time_after(start, now))
2398 static void xs_reconnect_backoff(struct rpc_xprt *xprt)
2400 xprt->reestablish_timeout <<= 1;
2401 if (xprt->reestablish_timeout > xprt->max_reconnect_timeout)
2402 xprt->reestablish_timeout = xprt->max_reconnect_timeout;
2403 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2404 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2408 * xs_connect - connect a socket to a remote endpoint
2409 * @xprt: pointer to transport structure
2410 * @task: address of RPC task that manages state of connect request
2412 * TCP: If the remote end dropped the connection, delay reconnecting.
2414 * UDP socket connects are synchronous, but we use a work queue anyway
2415 * to guarantee that even unprivileged user processes can set up a
2416 * socket on a privileged port.
2418 * If a UDP socket connect fails, the delay behavior here prevents
2419 * retry floods (hard mounts).
2421 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2423 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2424 unsigned long delay = 0;
2426 WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2428 if (transport->sock != NULL) {
2429 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2431 xprt, xprt->reestablish_timeout / HZ);
2433 /* Start by resetting any existing state */
2434 xs_reset_transport(transport);
2436 delay = xs_reconnect_delay(xprt);
2437 xs_reconnect_backoff(xprt);
2440 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2442 queue_delayed_work(xprtiod_workqueue,
2443 &transport->connect_worker,
2448 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2449 * @xprt: rpc_xprt struct containing statistics
2453 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2457 if (xprt_connected(xprt))
2458 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2460 seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2461 "%llu %llu %lu %llu %llu\n",
2462 xprt->stat.bind_count,
2463 xprt->stat.connect_count,
2464 xprt->stat.connect_time,
2468 xprt->stat.bad_xids,
2471 xprt->stat.max_slots,
2472 xprt->stat.sending_u,
2473 xprt->stat.pending_u);
2477 * xs_udp_print_stats - display UDP socket-specifc stats
2478 * @xprt: rpc_xprt struct containing statistics
2482 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2484 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2486 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2489 xprt->stat.bind_count,
2492 xprt->stat.bad_xids,
2495 xprt->stat.max_slots,
2496 xprt->stat.sending_u,
2497 xprt->stat.pending_u);
2501 * xs_tcp_print_stats - display TCP socket-specifc stats
2502 * @xprt: rpc_xprt struct containing statistics
2506 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2508 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2511 if (xprt_connected(xprt))
2512 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2514 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2515 "%llu %llu %lu %llu %llu\n",
2517 xprt->stat.bind_count,
2518 xprt->stat.connect_count,
2519 xprt->stat.connect_time,
2523 xprt->stat.bad_xids,
2526 xprt->stat.max_slots,
2527 xprt->stat.sending_u,
2528 xprt->stat.pending_u);
2532 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2533 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2534 * to use the server side send routines.
2536 static void *bc_malloc(struct rpc_task *task, size_t size)
2539 struct rpc_buffer *buf;
2541 WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2542 if (size > PAGE_SIZE - sizeof(struct rpc_buffer))
2545 page = alloc_page(GFP_KERNEL);
2549 buf = page_address(page);
2550 buf->len = PAGE_SIZE;
2556 * Free the space allocated in the bc_alloc routine
2558 static void bc_free(void *buffer)
2560 struct rpc_buffer *buf;
2565 buf = container_of(buffer, struct rpc_buffer, data);
2566 free_page((unsigned long)buf);
2570 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2571 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2573 static int bc_sendto(struct rpc_rqst *req)
2576 struct xdr_buf *xbufp = &req->rq_snd_buf;
2577 struct rpc_xprt *xprt = req->rq_xprt;
2578 struct sock_xprt *transport =
2579 container_of(xprt, struct sock_xprt, xprt);
2580 struct socket *sock = transport->sock;
2581 unsigned long headoff;
2582 unsigned long tailoff;
2584 xs_encode_stream_record_marker(xbufp);
2586 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2587 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2588 len = svc_send_common(sock, xbufp,
2589 virt_to_page(xbufp->head[0].iov_base), headoff,
2590 xbufp->tail[0].iov_base, tailoff);
2592 if (len != xbufp->len) {
2593 printk(KERN_NOTICE "Error sending entire callback!\n");
2601 * The send routine. Borrows from svc_send
2603 static int bc_send_request(struct rpc_task *task)
2605 struct rpc_rqst *req = task->tk_rqstp;
2606 struct svc_xprt *xprt;
2609 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2611 * Get the server socket associated with this callback xprt
2613 xprt = req->rq_xprt->bc_xprt;
2616 * Grab the mutex to serialize data as the connection is shared
2617 * with the fore channel
2619 if (!mutex_trylock(&xprt->xpt_mutex)) {
2620 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2621 if (!mutex_trylock(&xprt->xpt_mutex))
2623 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2625 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2628 len = bc_sendto(req);
2629 mutex_unlock(&xprt->xpt_mutex);
2638 * The close routine. Since this is client initiated, we do nothing
2641 static void bc_close(struct rpc_xprt *xprt)
2646 * The xprt destroy routine. Again, because this connection is client
2647 * initiated, we do nothing
2650 static void bc_destroy(struct rpc_xprt *xprt)
2652 dprintk("RPC: bc_destroy xprt %p\n", xprt);
2655 module_put(THIS_MODULE);
2658 static struct rpc_xprt_ops xs_local_ops = {
2659 .reserve_xprt = xprt_reserve_xprt,
2660 .release_xprt = xs_tcp_release_xprt,
2661 .alloc_slot = xprt_alloc_slot,
2662 .rpcbind = xs_local_rpcbind,
2663 .set_port = xs_local_set_port,
2664 .connect = xs_local_connect,
2665 .buf_alloc = rpc_malloc,
2666 .buf_free = rpc_free,
2667 .send_request = xs_local_send_request,
2668 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2670 .destroy = xs_destroy,
2671 .print_stats = xs_local_print_stats,
2672 .enable_swap = xs_enable_swap,
2673 .disable_swap = xs_disable_swap,
2676 static struct rpc_xprt_ops xs_udp_ops = {
2677 .set_buffer_size = xs_udp_set_buffer_size,
2678 .reserve_xprt = xprt_reserve_xprt_cong,
2679 .release_xprt = xprt_release_xprt_cong,
2680 .alloc_slot = xprt_alloc_slot,
2681 .rpcbind = rpcb_getport_async,
2682 .set_port = xs_set_port,
2683 .connect = xs_connect,
2684 .buf_alloc = rpc_malloc,
2685 .buf_free = rpc_free,
2686 .send_request = xs_udp_send_request,
2687 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2688 .timer = xs_udp_timer,
2689 .release_request = xprt_release_rqst_cong,
2691 .destroy = xs_destroy,
2692 .print_stats = xs_udp_print_stats,
2693 .enable_swap = xs_enable_swap,
2694 .disable_swap = xs_disable_swap,
2695 .inject_disconnect = xs_inject_disconnect,
2698 static struct rpc_xprt_ops xs_tcp_ops = {
2699 .reserve_xprt = xprt_reserve_xprt,
2700 .release_xprt = xs_tcp_release_xprt,
2701 .alloc_slot = xprt_lock_and_alloc_slot,
2702 .rpcbind = rpcb_getport_async,
2703 .set_port = xs_set_port,
2704 .connect = xs_connect,
2705 .buf_alloc = rpc_malloc,
2706 .buf_free = rpc_free,
2707 .send_request = xs_tcp_send_request,
2708 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2709 .close = xs_tcp_shutdown,
2710 .destroy = xs_destroy,
2711 .print_stats = xs_tcp_print_stats,
2712 .enable_swap = xs_enable_swap,
2713 .disable_swap = xs_disable_swap,
2714 .inject_disconnect = xs_inject_disconnect,
2715 #ifdef CONFIG_SUNRPC_BACKCHANNEL
2716 .bc_setup = xprt_setup_bc,
2717 .bc_up = xs_tcp_bc_up,
2718 .bc_maxpayload = xs_tcp_bc_maxpayload,
2719 .bc_free_rqst = xprt_free_bc_rqst,
2720 .bc_destroy = xprt_destroy_bc,
2725 * The rpc_xprt_ops for the server backchannel
2728 static struct rpc_xprt_ops bc_tcp_ops = {
2729 .reserve_xprt = xprt_reserve_xprt,
2730 .release_xprt = xprt_release_xprt,
2731 .alloc_slot = xprt_alloc_slot,
2732 .buf_alloc = bc_malloc,
2733 .buf_free = bc_free,
2734 .send_request = bc_send_request,
2735 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2737 .destroy = bc_destroy,
2738 .print_stats = xs_tcp_print_stats,
2739 .enable_swap = xs_enable_swap,
2740 .disable_swap = xs_disable_swap,
2741 .inject_disconnect = xs_inject_disconnect,
2744 static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2746 static const struct sockaddr_in sin = {
2747 .sin_family = AF_INET,
2748 .sin_addr.s_addr = htonl(INADDR_ANY),
2750 static const struct sockaddr_in6 sin6 = {
2751 .sin6_family = AF_INET6,
2752 .sin6_addr = IN6ADDR_ANY_INIT,
2759 memcpy(sap, &sin, sizeof(sin));
2762 memcpy(sap, &sin6, sizeof(sin6));
2765 dprintk("RPC: %s: Bad address family\n", __func__);
2766 return -EAFNOSUPPORT;
2771 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2772 unsigned int slot_table_size,
2773 unsigned int max_slot_table_size)
2775 struct rpc_xprt *xprt;
2776 struct sock_xprt *new;
2778 if (args->addrlen > sizeof(xprt->addr)) {
2779 dprintk("RPC: xs_setup_xprt: address too large\n");
2780 return ERR_PTR(-EBADF);
2783 xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2784 max_slot_table_size);
2786 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2788 return ERR_PTR(-ENOMEM);
2791 new = container_of(xprt, struct sock_xprt, xprt);
2792 mutex_init(&new->recv_mutex);
2793 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2794 xprt->addrlen = args->addrlen;
2796 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2799 err = xs_init_anyaddr(args->dstaddr->sa_family,
2800 (struct sockaddr *)&new->srcaddr);
2803 return ERR_PTR(err);
2810 static const struct rpc_timeout xs_local_default_timeout = {
2811 .to_initval = 10 * HZ,
2812 .to_maxval = 10 * HZ,
2817 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2818 * @args: rpc transport creation arguments
2820 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2822 static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2824 struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2825 struct sock_xprt *transport;
2826 struct rpc_xprt *xprt;
2827 struct rpc_xprt *ret;
2829 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2830 xprt_max_tcp_slot_table_entries);
2833 transport = container_of(xprt, struct sock_xprt, xprt);
2836 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2837 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2839 xprt->bind_timeout = XS_BIND_TO;
2840 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2841 xprt->idle_timeout = XS_IDLE_DISC_TO;
2843 xprt->ops = &xs_local_ops;
2844 xprt->timeout = &xs_local_default_timeout;
2846 INIT_WORK(&transport->recv_worker, xs_local_data_receive_workfn);
2847 INIT_DELAYED_WORK(&transport->connect_worker,
2848 xs_dummy_setup_socket);
2850 switch (sun->sun_family) {
2852 if (sun->sun_path[0] != '/') {
2853 dprintk("RPC: bad AF_LOCAL address: %s\n",
2855 ret = ERR_PTR(-EINVAL);
2858 xprt_set_bound(xprt);
2859 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2860 ret = ERR_PTR(xs_local_setup_socket(transport));
2865 ret = ERR_PTR(-EAFNOSUPPORT);
2869 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2870 xprt->address_strings[RPC_DISPLAY_ADDR]);
2872 if (try_module_get(THIS_MODULE))
2874 ret = ERR_PTR(-EINVAL);
2880 static const struct rpc_timeout xs_udp_default_timeout = {
2881 .to_initval = 5 * HZ,
2882 .to_maxval = 30 * HZ,
2883 .to_increment = 5 * HZ,
2888 * xs_setup_udp - Set up transport to use a UDP socket
2889 * @args: rpc transport creation arguments
2892 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2894 struct sockaddr *addr = args->dstaddr;
2895 struct rpc_xprt *xprt;
2896 struct sock_xprt *transport;
2897 struct rpc_xprt *ret;
2899 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2900 xprt_udp_slot_table_entries);
2903 transport = container_of(xprt, struct sock_xprt, xprt);
2905 xprt->prot = IPPROTO_UDP;
2907 /* XXX: header size can vary due to auth type, IPv6, etc. */
2908 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2910 xprt->bind_timeout = XS_BIND_TO;
2911 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2912 xprt->idle_timeout = XS_IDLE_DISC_TO;
2914 xprt->ops = &xs_udp_ops;
2916 xprt->timeout = &xs_udp_default_timeout;
2918 INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
2919 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
2921 switch (addr->sa_family) {
2923 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2924 xprt_set_bound(xprt);
2926 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2929 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2930 xprt_set_bound(xprt);
2932 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2935 ret = ERR_PTR(-EAFNOSUPPORT);
2939 if (xprt_bound(xprt))
2940 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2941 xprt->address_strings[RPC_DISPLAY_ADDR],
2942 xprt->address_strings[RPC_DISPLAY_PORT],
2943 xprt->address_strings[RPC_DISPLAY_PROTO]);
2945 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2946 xprt->address_strings[RPC_DISPLAY_ADDR],
2947 xprt->address_strings[RPC_DISPLAY_PROTO]);
2949 if (try_module_get(THIS_MODULE))
2951 ret = ERR_PTR(-EINVAL);
2957 static const struct rpc_timeout xs_tcp_default_timeout = {
2958 .to_initval = 60 * HZ,
2959 .to_maxval = 60 * HZ,
2964 * xs_setup_tcp - Set up transport to use a TCP socket
2965 * @args: rpc transport creation arguments
2968 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2970 struct sockaddr *addr = args->dstaddr;
2971 struct rpc_xprt *xprt;
2972 struct sock_xprt *transport;
2973 struct rpc_xprt *ret;
2974 unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2976 if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2977 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
2979 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2980 max_slot_table_size);
2983 transport = container_of(xprt, struct sock_xprt, xprt);
2985 xprt->prot = IPPROTO_TCP;
2986 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2987 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2989 xprt->bind_timeout = XS_BIND_TO;
2990 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2991 xprt->idle_timeout = XS_IDLE_DISC_TO;
2993 xprt->ops = &xs_tcp_ops;
2994 xprt->timeout = &xs_tcp_default_timeout;
2996 xprt->max_reconnect_timeout = xprt->timeout->to_maxval;
2998 INIT_WORK(&transport->recv_worker, xs_tcp_data_receive_workfn);
2999 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
3001 switch (addr->sa_family) {
3003 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
3004 xprt_set_bound(xprt);
3006 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
3009 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
3010 xprt_set_bound(xprt);
3012 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
3015 ret = ERR_PTR(-EAFNOSUPPORT);
3019 if (xprt_bound(xprt))
3020 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3021 xprt->address_strings[RPC_DISPLAY_ADDR],
3022 xprt->address_strings[RPC_DISPLAY_PORT],
3023 xprt->address_strings[RPC_DISPLAY_PROTO]);
3025 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
3026 xprt->address_strings[RPC_DISPLAY_ADDR],
3027 xprt->address_strings[RPC_DISPLAY_PROTO]);
3029 if (try_module_get(THIS_MODULE))
3031 ret = ERR_PTR(-EINVAL);
3038 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
3039 * @args: rpc transport creation arguments
3042 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
3044 struct sockaddr *addr = args->dstaddr;
3045 struct rpc_xprt *xprt;
3046 struct sock_xprt *transport;
3047 struct svc_sock *bc_sock;
3048 struct rpc_xprt *ret;
3050 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3051 xprt_tcp_slot_table_entries);
3054 transport = container_of(xprt, struct sock_xprt, xprt);
3056 xprt->prot = IPPROTO_TCP;
3057 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
3058 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3059 xprt->timeout = &xs_tcp_default_timeout;
3062 xprt_set_bound(xprt);
3063 xprt->bind_timeout = 0;
3064 xprt->reestablish_timeout = 0;
3065 xprt->idle_timeout = 0;
3067 xprt->ops = &bc_tcp_ops;
3069 switch (addr->sa_family) {
3071 xs_format_peer_addresses(xprt, "tcp",
3075 xs_format_peer_addresses(xprt, "tcp",
3076 RPCBIND_NETID_TCP6);
3079 ret = ERR_PTR(-EAFNOSUPPORT);
3083 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
3084 xprt->address_strings[RPC_DISPLAY_ADDR],
3085 xprt->address_strings[RPC_DISPLAY_PORT],
3086 xprt->address_strings[RPC_DISPLAY_PROTO]);
3089 * Once we've associated a backchannel xprt with a connection,
3090 * we want to keep it around as long as the connection lasts,
3091 * in case we need to start using it for a backchannel again;
3092 * this reference won't be dropped until bc_xprt is destroyed.
3095 args->bc_xprt->xpt_bc_xprt = xprt;
3096 xprt->bc_xprt = args->bc_xprt;
3097 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3098 transport->sock = bc_sock->sk_sock;
3099 transport->inet = bc_sock->sk_sk;
3102 * Since we don't want connections for the backchannel, we set
3103 * the xprt status to connected
3105 xprt_set_connected(xprt);
3107 if (try_module_get(THIS_MODULE))
3110 args->bc_xprt->xpt_bc_xprt = NULL;
3111 args->bc_xprt->xpt_bc_xps = NULL;
3113 ret = ERR_PTR(-EINVAL);
3119 static struct xprt_class xs_local_transport = {
3120 .list = LIST_HEAD_INIT(xs_local_transport.list),
3121 .name = "named UNIX socket",
3122 .owner = THIS_MODULE,
3123 .ident = XPRT_TRANSPORT_LOCAL,
3124 .setup = xs_setup_local,
3127 static struct xprt_class xs_udp_transport = {
3128 .list = LIST_HEAD_INIT(xs_udp_transport.list),
3130 .owner = THIS_MODULE,
3131 .ident = XPRT_TRANSPORT_UDP,
3132 .setup = xs_setup_udp,
3135 static struct xprt_class xs_tcp_transport = {
3136 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
3138 .owner = THIS_MODULE,
3139 .ident = XPRT_TRANSPORT_TCP,
3140 .setup = xs_setup_tcp,
3143 static struct xprt_class xs_bc_tcp_transport = {
3144 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3145 .name = "tcp NFSv4.1 backchannel",
3146 .owner = THIS_MODULE,
3147 .ident = XPRT_TRANSPORT_BC_TCP,
3148 .setup = xs_setup_bc_tcp,
3152 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3155 int init_socket_xprt(void)
3157 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3158 if (!sunrpc_table_header)
3159 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3162 xprt_register_transport(&xs_local_transport);
3163 xprt_register_transport(&xs_udp_transport);
3164 xprt_register_transport(&xs_tcp_transport);
3165 xprt_register_transport(&xs_bc_tcp_transport);
3171 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3174 void cleanup_socket_xprt(void)
3176 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3177 if (sunrpc_table_header) {
3178 unregister_sysctl_table(sunrpc_table_header);
3179 sunrpc_table_header = NULL;
3183 xprt_unregister_transport(&xs_local_transport);
3184 xprt_unregister_transport(&xs_udp_transport);
3185 xprt_unregister_transport(&xs_tcp_transport);
3186 xprt_unregister_transport(&xs_bc_tcp_transport);
3189 static int param_set_uint_minmax(const char *val,
3190 const struct kernel_param *kp,
3191 unsigned int min, unsigned int max)
3198 ret = kstrtouint(val, 0, &num);
3199 if (ret == -EINVAL || num < min || num > max)
3201 *((unsigned int *)kp->arg) = num;
3205 static int param_set_portnr(const char *val, const struct kernel_param *kp)
3207 if (kp->arg == &xprt_min_resvport)
3208 return param_set_uint_minmax(val, kp,
3211 return param_set_uint_minmax(val, kp,
3216 static const struct kernel_param_ops param_ops_portnr = {
3217 .set = param_set_portnr,
3218 .get = param_get_uint,
3221 #define param_check_portnr(name, p) \
3222 __param_check(name, p, unsigned int);
3224 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3225 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3227 static int param_set_slot_table_size(const char *val,
3228 const struct kernel_param *kp)
3230 return param_set_uint_minmax(val, kp,
3232 RPC_MAX_SLOT_TABLE);
3235 static const struct kernel_param_ops param_ops_slot_table_size = {
3236 .set = param_set_slot_table_size,
3237 .get = param_get_uint,
3240 #define param_check_slot_table_size(name, p) \
3241 __param_check(name, p, unsigned int);
3243 static int param_set_max_slot_table_size(const char *val,
3244 const struct kernel_param *kp)
3246 return param_set_uint_minmax(val, kp,
3248 RPC_MAX_SLOT_TABLE_LIMIT);
3251 static const struct kernel_param_ops param_ops_max_slot_table_size = {
3252 .set = param_set_max_slot_table_size,
3253 .get = param_get_uint,
3256 #define param_check_max_slot_table_size(name, p) \
3257 __param_check(name, p, unsigned int);
3259 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3260 slot_table_size, 0644);
3261 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3262 max_slot_table_size, 0644);
3263 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3264 slot_table_size, 0644);