2 * linux/net/sunrpc/xprtsock.c
4 * Client-side transport implementation for sockets.
6 * TCP callback races fixes (C) 1998 Red Hat Software <alan@redhat.com>
7 * TCP send fixes (C) 1998 Red Hat Software <alan@redhat.com>
8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
11 * Rewrite of larges part of the code in order to stabilize TCP stuff.
12 * Fix behaviour when socket buffer is full.
13 * (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
18 #include <linux/types.h>
19 #include <linux/slab.h>
20 #include <linux/capability.h>
21 #include <linux/sched.h>
22 #include <linux/pagemap.h>
23 #include <linux/errno.h>
24 #include <linux/socket.h>
26 #include <linux/net.h>
28 #include <linux/udp.h>
29 #include <linux/tcp.h>
30 #include <linux/sunrpc/clnt.h>
31 #include <linux/file.h>
34 #include <net/checksum.h>
39 * Maximum port number to use when requesting a reserved port.
41 #define XS_MAX_RESVPORT (800U)
44 * How many times to try sending a request on a socket before waiting
45 * for the socket buffer to clear.
47 #define XS_SENDMSG_RETRY (10U)
50 # undef RPC_DEBUG_DATA
51 # define RPCDBG_FACILITY RPCDBG_TRANS
55 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
57 u8 *buf = (u8 *) packet;
60 dprintk("RPC: %s\n", msg);
61 for (j = 0; j < count && j < 128; j += 4) {
65 dprintk("0x%04x ", j);
67 dprintk("%02x%02x%02x%02x ",
68 buf[j], buf[j+1], buf[j+2], buf[j+3]);
73 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
79 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
81 static inline int xs_send_head(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, unsigned int len)
84 .iov_base = xdr->head[0].iov_base + base,
85 .iov_len = len - base,
89 .msg_namelen = addrlen,
90 .msg_flags = XS_SENDMSG_FLAGS,
94 msg.msg_flags |= MSG_MORE;
96 if (likely(iov.iov_len))
97 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
98 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
101 static int xs_send_tail(struct socket *sock, struct xdr_buf *xdr, unsigned int base, unsigned int len)
104 .iov_base = xdr->tail[0].iov_base + base,
105 .iov_len = len - base,
107 struct msghdr msg = {
108 .msg_flags = XS_SENDMSG_FLAGS,
111 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
115 * xs_sendpages - write pages directly to a socket
116 * @sock: socket to send on
117 * @addr: UDP only -- address of destination
118 * @addrlen: UDP only -- length of destination address
119 * @xdr: buffer containing this request
120 * @base: starting position in the buffer
123 static inline int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
125 struct page **ppage = xdr->pages;
126 unsigned int len, pglen = xdr->page_len;
128 ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int);
133 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
135 len = xdr->head[0].iov_len;
136 if (base < len || (addr != NULL && base == 0)) {
137 err = xs_send_head(sock, addr, addrlen, xdr, base, len);
142 if (err != (len - base))
148 if (unlikely(pglen == 0))
150 if (unlikely(base >= pglen)) {
154 if (base || xdr->page_base) {
156 base += xdr->page_base;
157 ppage += base >> PAGE_CACHE_SHIFT;
158 base &= ~PAGE_CACHE_MASK;
161 sendpage = sock->ops->sendpage ? : sock_no_sendpage;
163 int flags = XS_SENDMSG_FLAGS;
165 len = PAGE_CACHE_SIZE;
171 if (pglen != len || xdr->tail[0].iov_len != 0)
174 /* Hmm... We might be dealing with highmem pages */
175 if (PageHighMem(*ppage))
176 sendpage = sock_no_sendpage;
177 err = sendpage(sock, *ppage, base, len, flags);
186 } while ((pglen -= len) != 0);
188 len = xdr->tail[0].iov_len;
190 err = xs_send_tail(sock, xdr, base, len);
201 * xs_nospace - place task on wait queue if transmit was incomplete
202 * @task: task to put to sleep
205 static void xs_nospace(struct rpc_task *task)
207 struct rpc_rqst *req = task->tk_rqstp;
208 struct rpc_xprt *xprt = req->rq_xprt;
210 dprintk("RPC: %4d xmit incomplete (%u left of %u)\n",
211 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
214 if (test_bit(SOCK_ASYNC_NOSPACE, &xprt->sock->flags)) {
215 /* Protect against races with write_space */
216 spin_lock_bh(&xprt->transport_lock);
218 /* Don't race with disconnect */
219 if (!xprt_connected(xprt))
220 task->tk_status = -ENOTCONN;
221 else if (test_bit(SOCK_NOSPACE, &xprt->sock->flags))
222 xprt_wait_for_buffer_space(task);
224 spin_unlock_bh(&xprt->transport_lock);
226 /* Keep holding the socket if it is blocked */
227 rpc_delay(task, HZ>>4);
231 * xs_udp_send_request - write an RPC request to a UDP socket
232 * @task: address of RPC task that manages the state of an RPC request
235 * 0: The request has been sent
236 * EAGAIN: The socket was blocked, please call again later to
237 * complete the request
238 * ENOTCONN: Caller needs to invoke connect logic then call again
239 * other: Some other error occured, the request was not sent
241 static int xs_udp_send_request(struct rpc_task *task)
243 struct rpc_rqst *req = task->tk_rqstp;
244 struct rpc_xprt *xprt = req->rq_xprt;
245 struct xdr_buf *xdr = &req->rq_snd_buf;
248 xs_pktdump("packet data:",
249 req->rq_svec->iov_base,
250 req->rq_svec->iov_len);
252 req->rq_xtime = jiffies;
253 status = xs_sendpages(xprt->sock, (struct sockaddr *) &xprt->addr,
254 sizeof(xprt->addr), xdr, req->rq_bytes_sent);
256 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
257 xdr->len - req->rq_bytes_sent, status);
259 if (likely(status >= (int) req->rq_slen))
262 /* Still some bytes left; set up for a retry later. */
270 /* When the server has died, an ICMP port unreachable message
271 * prompts ECONNREFUSED. */
277 dprintk("RPC: sendmsg returned unrecognized error %d\n",
285 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
287 u32 reclen = buf->len - sizeof(rpc_fraghdr);
288 rpc_fraghdr *base = buf->head[0].iov_base;
289 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
293 * xs_tcp_send_request - write an RPC request to a TCP socket
294 * @task: address of RPC task that manages the state of an RPC request
297 * 0: The request has been sent
298 * EAGAIN: The socket was blocked, please call again later to
299 * complete the request
300 * ENOTCONN: Caller needs to invoke connect logic then call again
301 * other: Some other error occured, the request was not sent
303 * XXX: In the case of soft timeouts, should we eventually give up
304 * if sendmsg is not able to make progress?
306 static int xs_tcp_send_request(struct rpc_task *task)
308 struct rpc_rqst *req = task->tk_rqstp;
309 struct rpc_xprt *xprt = req->rq_xprt;
310 struct xdr_buf *xdr = &req->rq_snd_buf;
311 int status, retry = 0;
313 xs_encode_tcp_record_marker(&req->rq_snd_buf);
315 xs_pktdump("packet data:",
316 req->rq_svec->iov_base,
317 req->rq_svec->iov_len);
319 /* Continue transmitting the packet/record. We must be careful
320 * to cope with writespace callbacks arriving _after_ we have
321 * called sendmsg(). */
323 req->rq_xtime = jiffies;
324 status = xs_sendpages(xprt->sock, NULL, 0, xdr,
327 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
328 xdr->len - req->rq_bytes_sent, status);
330 if (unlikely(status < 0))
333 /* If we've sent the entire packet, immediately
334 * reset the count of bytes sent. */
335 req->rq_bytes_sent += status;
336 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
337 req->rq_bytes_sent = 0;
342 if (retry++ > XS_SENDMSG_RETRY)
357 dprintk("RPC: sendmsg returned unrecognized error %d\n",
366 * xs_close - close a socket
370 static void xs_close(struct rpc_xprt *xprt)
372 struct socket *sock = xprt->sock;
373 struct sock *sk = xprt->inet;
378 dprintk("RPC: xs_close xprt %p\n", xprt);
380 write_lock_bh(&sk->sk_callback_lock);
384 sk->sk_user_data = NULL;
385 sk->sk_data_ready = xprt->old_data_ready;
386 sk->sk_state_change = xprt->old_state_change;
387 sk->sk_write_space = xprt->old_write_space;
388 write_unlock_bh(&sk->sk_callback_lock);
396 * xs_destroy - prepare to shutdown a transport
397 * @xprt: doomed transport
400 static void xs_destroy(struct rpc_xprt *xprt)
402 dprintk("RPC: xs_destroy xprt %p\n", xprt);
404 cancel_delayed_work(&xprt->connect_worker);
405 flush_scheduled_work();
407 xprt_disconnect(xprt);
412 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
414 return (struct rpc_xprt *) sk->sk_user_data;
418 * xs_udp_data_ready - "data ready" callback for UDP sockets
419 * @sk: socket with data to read
420 * @len: how much data to read
423 static void xs_udp_data_ready(struct sock *sk, int len)
425 struct rpc_task *task;
426 struct rpc_xprt *xprt;
427 struct rpc_rqst *rovr;
429 int err, repsize, copied;
432 read_lock(&sk->sk_callback_lock);
433 dprintk("RPC: xs_udp_data_ready...\n");
434 if (!(xprt = xprt_from_sock(sk)))
437 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
443 repsize = skb->len - sizeof(struct udphdr);
445 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
449 /* Copy the XID from the skb... */
450 xp = skb_header_pointer(skb, sizeof(struct udphdr),
451 sizeof(_xid), &_xid);
455 /* Look up and lock the request corresponding to the given XID */
456 spin_lock(&xprt->transport_lock);
457 rovr = xprt_lookup_rqst(xprt, *xp);
460 task = rovr->rq_task;
462 dprintk("RPC: %4d received reply\n", task->tk_pid);
464 if ((copied = rovr->rq_private_buf.buflen) > repsize)
467 /* Suck it into the iovec, verify checksum if not done by hw. */
468 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb))
471 /* Something worked... */
472 dst_confirm(skb->dst);
474 xprt_complete_rqst(xprt, rovr, copied);
477 spin_unlock(&xprt->transport_lock);
479 skb_free_datagram(sk, skb);
481 read_unlock(&sk->sk_callback_lock);
484 static inline size_t xs_tcp_copy_data(skb_reader_t *desc, void *p, size_t len)
486 if (len > desc->count)
488 if (skb_copy_bits(desc->skb, desc->offset, p, len)) {
489 dprintk("RPC: failed to copy %zu bytes from skb. %zu bytes remain\n",
495 dprintk("RPC: copied %zu bytes from skb. %zu bytes remain\n",
500 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, skb_reader_t *desc)
505 p = ((char *) &xprt->tcp_recm) + xprt->tcp_offset;
506 len = sizeof(xprt->tcp_recm) - xprt->tcp_offset;
507 used = xs_tcp_copy_data(desc, p, len);
508 xprt->tcp_offset += used;
512 xprt->tcp_reclen = ntohl(xprt->tcp_recm);
513 if (xprt->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
514 xprt->tcp_flags |= XPRT_LAST_FRAG;
516 xprt->tcp_flags &= ~XPRT_LAST_FRAG;
517 xprt->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
519 xprt->tcp_flags &= ~XPRT_COPY_RECM;
520 xprt->tcp_offset = 0;
522 /* Sanity check of the record length */
523 if (unlikely(xprt->tcp_reclen < 4)) {
524 dprintk("RPC: invalid TCP record fragment length\n");
525 xprt_disconnect(xprt);
528 dprintk("RPC: reading TCP record fragment of length %d\n",
532 static void xs_tcp_check_recm(struct rpc_xprt *xprt)
534 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u, tcp_flags = %lx\n",
535 xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen, xprt->tcp_flags);
536 if (xprt->tcp_offset == xprt->tcp_reclen) {
537 xprt->tcp_flags |= XPRT_COPY_RECM;
538 xprt->tcp_offset = 0;
539 if (xprt->tcp_flags & XPRT_LAST_FRAG) {
540 xprt->tcp_flags &= ~XPRT_COPY_DATA;
541 xprt->tcp_flags |= XPRT_COPY_XID;
542 xprt->tcp_copied = 0;
547 static inline void xs_tcp_read_xid(struct rpc_xprt *xprt, skb_reader_t *desc)
552 len = sizeof(xprt->tcp_xid) - xprt->tcp_offset;
553 dprintk("RPC: reading XID (%Zu bytes)\n", len);
554 p = ((char *) &xprt->tcp_xid) + xprt->tcp_offset;
555 used = xs_tcp_copy_data(desc, p, len);
556 xprt->tcp_offset += used;
559 xprt->tcp_flags &= ~XPRT_COPY_XID;
560 xprt->tcp_flags |= XPRT_COPY_DATA;
561 xprt->tcp_copied = 4;
562 dprintk("RPC: reading reply for XID %08x\n",
563 ntohl(xprt->tcp_xid));
564 xs_tcp_check_recm(xprt);
567 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, skb_reader_t *desc)
569 struct rpc_rqst *req;
570 struct xdr_buf *rcvbuf;
574 /* Find and lock the request corresponding to this xid */
575 spin_lock(&xprt->transport_lock);
576 req = xprt_lookup_rqst(xprt, xprt->tcp_xid);
578 xprt->tcp_flags &= ~XPRT_COPY_DATA;
579 dprintk("RPC: XID %08x request not found!\n",
580 ntohl(xprt->tcp_xid));
581 spin_unlock(&xprt->transport_lock);
585 rcvbuf = &req->rq_private_buf;
587 if (len > xprt->tcp_reclen - xprt->tcp_offset) {
588 skb_reader_t my_desc;
590 len = xprt->tcp_reclen - xprt->tcp_offset;
591 memcpy(&my_desc, desc, sizeof(my_desc));
593 r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied,
594 &my_desc, xs_tcp_copy_data);
598 r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied,
599 desc, xs_tcp_copy_data);
602 xprt->tcp_copied += r;
603 xprt->tcp_offset += r;
606 /* Error when copying to the receive buffer,
607 * usually because we weren't able to allocate
608 * additional buffer pages. All we can do now
609 * is turn off XPRT_COPY_DATA, so the request
610 * will not receive any additional updates,
612 * Any remaining data from this record will
615 xprt->tcp_flags &= ~XPRT_COPY_DATA;
616 dprintk("RPC: XID %08x truncated request\n",
617 ntohl(xprt->tcp_xid));
618 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n",
619 xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen);
623 dprintk("RPC: XID %08x read %Zd bytes\n",
624 ntohl(xprt->tcp_xid), r);
625 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n",
626 xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen);
628 if (xprt->tcp_copied == req->rq_private_buf.buflen)
629 xprt->tcp_flags &= ~XPRT_COPY_DATA;
630 else if (xprt->tcp_offset == xprt->tcp_reclen) {
631 if (xprt->tcp_flags & XPRT_LAST_FRAG)
632 xprt->tcp_flags &= ~XPRT_COPY_DATA;
636 if (!(xprt->tcp_flags & XPRT_COPY_DATA)) {
637 dprintk("RPC: %4d received reply complete\n",
638 req->rq_task->tk_pid);
639 xprt_complete_rqst(xprt, req, xprt->tcp_copied);
641 spin_unlock(&xprt->transport_lock);
642 xs_tcp_check_recm(xprt);
645 static inline void xs_tcp_read_discard(struct rpc_xprt *xprt, skb_reader_t *desc)
649 len = xprt->tcp_reclen - xprt->tcp_offset;
650 if (len > desc->count)
654 xprt->tcp_offset += len;
655 dprintk("RPC: discarded %Zu bytes\n", len);
656 xs_tcp_check_recm(xprt);
659 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
661 struct rpc_xprt *xprt = rd_desc->arg.data;
662 skb_reader_t desc = {
669 dprintk("RPC: xs_tcp_data_recv started\n");
671 /* Read in a new fragment marker if necessary */
672 /* Can we ever really expect to get completely empty fragments? */
673 if (xprt->tcp_flags & XPRT_COPY_RECM) {
674 xs_tcp_read_fraghdr(xprt, &desc);
677 /* Read in the xid if necessary */
678 if (xprt->tcp_flags & XPRT_COPY_XID) {
679 xs_tcp_read_xid(xprt, &desc);
682 /* Read in the request data */
683 if (xprt->tcp_flags & XPRT_COPY_DATA) {
684 xs_tcp_read_request(xprt, &desc);
687 /* Skip over any trailing bytes on short reads */
688 xs_tcp_read_discard(xprt, &desc);
689 } while (desc.count);
690 dprintk("RPC: xs_tcp_data_recv done\n");
691 return len - desc.count;
695 * xs_tcp_data_ready - "data ready" callback for TCP sockets
696 * @sk: socket with data to read
697 * @bytes: how much data to read
700 static void xs_tcp_data_ready(struct sock *sk, int bytes)
702 struct rpc_xprt *xprt;
703 read_descriptor_t rd_desc;
705 read_lock(&sk->sk_callback_lock);
706 dprintk("RPC: xs_tcp_data_ready...\n");
707 if (!(xprt = xprt_from_sock(sk)))
712 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
713 rd_desc.arg.data = xprt;
714 rd_desc.count = 65536;
715 tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
717 read_unlock(&sk->sk_callback_lock);
721 * xs_tcp_state_change - callback to handle TCP socket state changes
722 * @sk: socket whose state has changed
725 static void xs_tcp_state_change(struct sock *sk)
727 struct rpc_xprt *xprt;
729 read_lock(&sk->sk_callback_lock);
730 if (!(xprt = xprt_from_sock(sk)))
732 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
733 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
734 sk->sk_state, xprt_connected(xprt),
735 sock_flag(sk, SOCK_DEAD),
736 sock_flag(sk, SOCK_ZAPPED));
738 switch (sk->sk_state) {
739 case TCP_ESTABLISHED:
740 spin_lock_bh(&xprt->transport_lock);
741 if (!xprt_test_and_set_connected(xprt)) {
742 /* Reset TCP record info */
743 xprt->tcp_offset = 0;
744 xprt->tcp_reclen = 0;
745 xprt->tcp_copied = 0;
746 xprt->tcp_flags = XPRT_COPY_RECM | XPRT_COPY_XID;
747 xprt_wake_pending_tasks(xprt, 0);
749 spin_unlock_bh(&xprt->transport_lock);
755 xprt_disconnect(xprt);
759 read_unlock(&sk->sk_callback_lock);
763 * xs_udp_write_space - callback invoked when socket buffer space
765 * @sk: socket whose state has changed
767 * Called when more output buffer space is available for this socket.
768 * We try not to wake our writers until they can make "significant"
769 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
770 * with a bunch of small requests.
772 static void xs_udp_write_space(struct sock *sk)
774 read_lock(&sk->sk_callback_lock);
776 /* from net/core/sock.c:sock_def_write_space */
777 if (sock_writeable(sk)) {
779 struct rpc_xprt *xprt;
781 if (unlikely(!(sock = sk->sk_socket)))
783 if (unlikely(!(xprt = xprt_from_sock(sk))))
785 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
788 xprt_write_space(xprt);
792 read_unlock(&sk->sk_callback_lock);
796 * xs_tcp_write_space - callback invoked when socket buffer space
798 * @sk: socket whose state has changed
800 * Called when more output buffer space is available for this socket.
801 * We try not to wake our writers until they can make "significant"
802 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
803 * with a bunch of small requests.
805 static void xs_tcp_write_space(struct sock *sk)
807 read_lock(&sk->sk_callback_lock);
809 /* from net/core/stream.c:sk_stream_write_space */
810 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
812 struct rpc_xprt *xprt;
814 if (unlikely(!(sock = sk->sk_socket)))
816 if (unlikely(!(xprt = xprt_from_sock(sk))))
818 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
821 xprt_write_space(xprt);
825 read_unlock(&sk->sk_callback_lock);
829 * xs_set_buffer_size - set send and receive limits
830 * @xprt: generic transport
832 * Set socket send and receive limits based on the
833 * sndsize and rcvsize fields in the generic transport
834 * structure. This applies only to UDP sockets.
836 static void xs_set_buffer_size(struct rpc_xprt *xprt)
838 struct sock *sk = xprt->inet;
843 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
844 sk->sk_rcvbuf = xprt->rcvsize * xprt->max_reqs * 2;
847 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
848 sk->sk_sndbuf = xprt->sndsize * xprt->max_reqs * 2;
849 sk->sk_write_space(sk);
853 static int xs_bindresvport(struct rpc_xprt *xprt, struct socket *sock)
855 struct sockaddr_in myaddr = {
856 .sin_family = AF_INET,
860 /* Were we already bound to a given port? Try to reuse it */
863 myaddr.sin_port = htons(port);
864 err = sock->ops->bind(sock, (struct sockaddr *) &myaddr,
868 dprintk("RPC: xs_bindresvport bound to port %u\n",
873 port = XS_MAX_RESVPORT;
874 } while (err == -EADDRINUSE && port != xprt->port);
876 dprintk("RPC: can't bind to reserved port (%d).\n", -err);
881 * xs_udp_connect_worker - set up a UDP socket
882 * @args: RPC transport to connect
884 * Invoked by a work queue tasklet.
886 static void xs_udp_connect_worker(void *args)
888 struct rpc_xprt *xprt = (struct rpc_xprt *) args;
889 struct socket *sock = xprt->sock;
890 int err, status = -EIO;
892 if (xprt->shutdown || xprt->addr.sin_port == 0)
895 dprintk("RPC: xs_udp_connect_worker for xprt %p\n", xprt);
897 /* Start by resetting any existing state */
900 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
901 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
905 if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) {
911 struct sock *sk = sock->sk;
913 write_lock_bh(&sk->sk_callback_lock);
915 sk->sk_user_data = xprt;
916 xprt->old_data_ready = sk->sk_data_ready;
917 xprt->old_state_change = sk->sk_state_change;
918 xprt->old_write_space = sk->sk_write_space;
919 sk->sk_data_ready = xs_udp_data_ready;
920 sk->sk_write_space = xs_udp_write_space;
921 sk->sk_no_check = UDP_CSUM_NORCV;
923 xprt_set_connected(xprt);
925 /* Reset to new socket */
929 write_unlock_bh(&sk->sk_callback_lock);
931 xs_set_buffer_size(xprt);
934 xprt_wake_pending_tasks(xprt, status);
935 xprt_clear_connecting(xprt);
939 * xs_tcp_connect_worker - connect a TCP socket to a remote endpoint
940 * @args: RPC transport to connect
942 * Invoked by a work queue tasklet.
944 static void xs_tcp_connect_worker(void *args)
946 struct rpc_xprt *xprt = (struct rpc_xprt *)args;
947 struct socket *sock = xprt->sock;
948 int err, status = -EIO;
950 if (xprt->shutdown || xprt->addr.sin_port == 0)
953 dprintk("RPC: xs_tcp_connect_worker for xprt %p\n", xprt);
955 /* Start by resetting any existing socket state */
958 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
959 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
963 if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) {
969 struct sock *sk = sock->sk;
971 write_lock_bh(&sk->sk_callback_lock);
973 sk->sk_user_data = xprt;
974 xprt->old_data_ready = sk->sk_data_ready;
975 xprt->old_state_change = sk->sk_state_change;
976 xprt->old_write_space = sk->sk_write_space;
977 sk->sk_data_ready = xs_tcp_data_ready;
978 sk->sk_state_change = xs_tcp_state_change;
979 sk->sk_write_space = xs_tcp_write_space;
980 tcp_sk(sk)->nonagle = 1;
982 xprt_clear_connected(xprt);
984 /* Reset to new socket */
988 write_unlock_bh(&sk->sk_callback_lock);
991 /* Tell the socket layer to start connecting... */
992 status = sock->ops->connect(sock, (struct sockaddr *) &xprt->addr,
993 sizeof(xprt->addr), O_NONBLOCK);
994 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
995 xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1004 xprt_wake_pending_tasks(xprt, status);
1006 xprt_clear_connecting(xprt);
1010 * xs_connect - connect a socket to a remote endpoint
1011 * @task: address of RPC task that manages state of connect request
1013 * TCP: If the remote end dropped the connection, delay reconnecting.
1015 static void xs_connect(struct rpc_task *task)
1017 struct rpc_xprt *xprt = task->tk_xprt;
1019 if (xprt_test_and_set_connecting(xprt))
1022 if (xprt->sock != NULL) {
1023 dprintk("RPC: xs_connect delayed xprt %p\n", xprt);
1024 schedule_delayed_work(&xprt->connect_worker,
1025 RPC_REESTABLISH_TIMEOUT);
1027 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1028 schedule_work(&xprt->connect_worker);
1030 /* flush_scheduled_work can sleep... */
1031 if (!RPC_IS_ASYNC(task))
1032 flush_scheduled_work();
1036 static struct rpc_xprt_ops xs_udp_ops = {
1037 .set_buffer_size = xs_set_buffer_size,
1038 .connect = xs_connect,
1039 .send_request = xs_udp_send_request,
1041 .destroy = xs_destroy,
1044 static struct rpc_xprt_ops xs_tcp_ops = {
1045 .set_buffer_size = xs_set_buffer_size,
1046 .connect = xs_connect,
1047 .send_request = xs_tcp_send_request,
1049 .destroy = xs_destroy,
1052 extern unsigned int xprt_udp_slot_table_entries;
1053 extern unsigned int xprt_tcp_slot_table_entries;
1056 * xs_setup_udp - Set up transport to use a UDP socket
1057 * @xprt: transport to set up
1058 * @to: timeout parameters
1061 int xs_setup_udp(struct rpc_xprt *xprt, struct rpc_timeout *to)
1063 size_t slot_table_size;
1065 dprintk("RPC: setting up udp-ipv4 transport...\n");
1067 xprt->max_reqs = xprt_udp_slot_table_entries;
1068 slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]);
1069 xprt->slot = kmalloc(slot_table_size, GFP_KERNEL);
1070 if (xprt->slot == NULL)
1072 memset(xprt->slot, 0, slot_table_size);
1074 xprt->prot = IPPROTO_UDP;
1075 xprt->port = XS_MAX_RESVPORT;
1079 xprt->cwnd = RPC_INITCWND;
1080 xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;
1081 /* XXX: header size can vary due to auth type, IPv6, etc. */
1082 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1084 INIT_WORK(&xprt->connect_worker, xs_udp_connect_worker, xprt);
1086 xprt->ops = &xs_udp_ops;
1089 xprt->timeout = *to;
1091 xprt_set_timeout(&xprt->timeout, 5, 5 * HZ);
1097 * xs_setup_tcp - Set up transport to use a TCP socket
1098 * @xprt: transport to set up
1099 * @to: timeout parameters
1102 int xs_setup_tcp(struct rpc_xprt *xprt, struct rpc_timeout *to)
1104 size_t slot_table_size;
1106 dprintk("RPC: setting up tcp-ipv4 transport...\n");
1108 xprt->max_reqs = xprt_tcp_slot_table_entries;
1109 slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]);
1110 xprt->slot = kmalloc(slot_table_size, GFP_KERNEL);
1111 if (xprt->slot == NULL)
1113 memset(xprt->slot, 0, slot_table_size);
1115 xprt->prot = IPPROTO_TCP;
1116 xprt->port = XS_MAX_RESVPORT;
1117 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
1120 xprt->cwnd = RPC_MAXCWND(xprt);
1121 xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;
1122 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
1124 INIT_WORK(&xprt->connect_worker, xs_tcp_connect_worker, xprt);
1126 xprt->ops = &xs_tcp_ops;
1129 xprt->timeout = *to;
1131 xprt_set_timeout(&xprt->timeout, 2, 60 * HZ);