* Rewrite of larges part of the code in order to stabilize TCP stuff.
* Fix behaviour when socket buffer is full.
* (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
+ *
+ * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
*/
#include <linux/types.h>
#include <linux/udp.h>
#include <linux/tcp.h>
#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/sched.h>
#include <linux/file.h>
#include <net/sock.h>
#include <net/tcp.h>
/*
- * Maximum port number to use when requesting a reserved port.
+ * xprtsock tunables
+ */
+unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
+unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
+
+unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
+unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
+
+/*
+ * How many times to try sending a request on a socket before waiting
+ * for the socket buffer to clear.
+ */
+#define XS_SENDMSG_RETRY (10U)
+
+/*
+ * Time out for an RPC UDP socket connect. UDP socket connects are
+ * synchronous, but we set a timeout anyway in case of resource
+ * exhaustion on the local host.
*/
-#define XS_MAX_RESVPORT (800U)
+#define XS_UDP_CONN_TO (5U * HZ)
+
+/*
+ * Wait duration for an RPC TCP connection to be established. Solaris
+ * NFS over TCP uses 60 seconds, for example, which is in line with how
+ * long a server takes to reboot.
+ */
+#define XS_TCP_CONN_TO (60U * HZ)
+
+/*
+ * Wait duration for a reply from the RPC portmapper.
+ */
+#define XS_BIND_TO (60U * HZ)
+
+/*
+ * Delay if a UDP socket connect error occurs. This is most likely some
+ * kind of resource problem on the local host.
+ */
+#define XS_UDP_REEST_TO (2U * HZ)
+
+/*
+ * The reestablish timeout allows clients to delay for a bit before attempting
+ * to reconnect to a server that just dropped our connection.
+ *
+ * We implement an exponential backoff when trying to reestablish a TCP
+ * transport connection with the server. Some servers like to drop a TCP
+ * connection when they are overworked, so we start with a short timeout and
+ * increase over time if the server is down or not responding.
+ */
+#define XS_TCP_INIT_REEST_TO (3U * HZ)
+#define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
+
+/*
+ * TCP idle timeout; client drops the transport socket if it is idle
+ * for this long. Note that we also timeout UDP sockets to prevent
+ * holding port numbers when there is no RPC traffic.
+ */
+#define XS_IDLE_DISC_TO (5U * 60 * HZ)
#ifdef RPC_DEBUG
# undef RPC_DEBUG_DATA
* @base: starting position in the buffer
*
*/
-static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
+static inline int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
{
struct page **ppage = xdr->pages;
unsigned int len, pglen = xdr->page_len;
int err, ret = 0;
ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int);
+ if (unlikely(!sock))
+ return -ENOTCONN;
+
+ clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
+
len = xdr->head[0].iov_len;
if (base < len || (addr != NULL && base == 0)) {
err = xs_send_head(sock, addr, addrlen, xdr, base, len);
}
/**
- * xs_sendmsg - write an RPC request to a socket
- * @xprt: generic transport
- * @req: the RPC request to write
+ * xs_nospace - place task on wait queue if transmit was incomplete
+ * @task: task to put to sleep
*
*/
-static int xs_sendmsg(struct rpc_xprt *xprt, struct rpc_rqst *req)
+static void xs_nospace(struct rpc_task *task)
{
- struct socket *sock = xprt->sock;
- struct xdr_buf *xdr = &req->rq_snd_buf;
- struct sockaddr *addr = NULL;
- int addrlen = 0;
- unsigned int skip;
- int result;
+ struct rpc_rqst *req = task->tk_rqstp;
+ struct rpc_xprt *xprt = req->rq_xprt;
- if (!sock)
- return -ENOTCONN;
+ dprintk("RPC: %4d xmit incomplete (%u left of %u)\n",
+ task->tk_pid, req->rq_slen - req->rq_bytes_sent,
+ req->rq_slen);
+
+ if (test_bit(SOCK_ASYNC_NOSPACE, &xprt->sock->flags)) {
+ /* Protect against races with write_space */
+ spin_lock_bh(&xprt->transport_lock);
+
+ /* Don't race with disconnect */
+ if (!xprt_connected(xprt))
+ task->tk_status = -ENOTCONN;
+ else if (test_bit(SOCK_NOSPACE, &xprt->sock->flags))
+ xprt_wait_for_buffer_space(task);
+
+ spin_unlock_bh(&xprt->transport_lock);
+ } else
+ /* Keep holding the socket if it is blocked */
+ rpc_delay(task, HZ>>4);
+}
+
+/**
+ * xs_udp_send_request - write an RPC request to a UDP socket
+ * @task: address of RPC task that manages the state of an RPC request
+ *
+ * Return values:
+ * 0: The request has been sent
+ * EAGAIN: The socket was blocked, please call again later to
+ * complete the request
+ * ENOTCONN: Caller needs to invoke connect logic then call again
+ * other: Some other error occured, the request was not sent
+ */
+static int xs_udp_send_request(struct rpc_task *task)
+{
+ struct rpc_rqst *req = task->tk_rqstp;
+ struct rpc_xprt *xprt = req->rq_xprt;
+ struct xdr_buf *xdr = &req->rq_snd_buf;
+ int status;
xs_pktdump("packet data:",
req->rq_svec->iov_base,
req->rq_svec->iov_len);
- /* For UDP, we need to provide an address */
- if (!xprt->stream) {
- addr = (struct sockaddr *) &xprt->addr;
- addrlen = sizeof(xprt->addr);
- }
- /* Don't repeat bytes */
- skip = req->rq_bytes_sent;
+ req->rq_xtime = jiffies;
+ status = xs_sendpages(xprt->sock, (struct sockaddr *) &xprt->addr,
+ sizeof(xprt->addr), xdr, req->rq_bytes_sent);
- clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
- result = xs_sendpages(sock, addr, addrlen, xdr, skip);
+ dprintk("RPC: xs_udp_send_request(%u) = %d\n",
+ xdr->len - req->rq_bytes_sent, status);
- dprintk("RPC: xs_sendmsg(%d) = %d\n", xdr->len - skip, result);
+ if (likely(status >= (int) req->rq_slen))
+ return 0;
- if (result >= 0)
- return result;
+ /* Still some bytes left; set up for a retry later. */
+ if (status > 0)
+ status = -EAGAIN;
- switch (result) {
+ switch (status) {
+ case -ENETUNREACH:
+ case -EPIPE:
case -ECONNREFUSED:
/* When the server has died, an ICMP port unreachable message
* prompts ECONNREFUSED. */
- case -EAGAIN:
break;
- case -ECONNRESET:
- case -ENOTCONN:
- case -EPIPE:
- /* connection broken */
- if (xprt->stream)
- result = -ENOTCONN;
+ case -EAGAIN:
+ xs_nospace(task);
break;
default:
+ dprintk("RPC: sendmsg returned unrecognized error %d\n",
+ -status);
break;
}
- return result;
+
+ return status;
+}
+
+static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
+{
+ u32 reclen = buf->len - sizeof(rpc_fraghdr);
+ rpc_fraghdr *base = buf->head[0].iov_base;
+ *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
}
/**
- * xs_send_request - write an RPC request to a socket
+ * xs_tcp_send_request - write an RPC request to a TCP socket
* @task: address of RPC task that manages the state of an RPC request
*
* Return values:
- * 0: The request has been sent
- * EAGAIN: The socket was blocked, please call again later to
- * complete the request
- * other: Some other error occured, the request was not sent
+ * 0: The request has been sent
+ * EAGAIN: The socket was blocked, please call again later to
+ * complete the request
+ * ENOTCONN: Caller needs to invoke connect logic then call again
+ * other: Some other error occured, the request was not sent
*
* XXX: In the case of soft timeouts, should we eventually give up
- * if the socket is not able to make progress?
+ * if sendmsg is not able to make progress?
*/
-static int xs_send_request(struct rpc_task *task)
+static int xs_tcp_send_request(struct rpc_task *task)
{
struct rpc_rqst *req = task->tk_rqstp;
struct rpc_xprt *xprt = req->rq_xprt;
+ struct xdr_buf *xdr = &req->rq_snd_buf;
int status, retry = 0;
- /* set up everything as needed. */
- /* Write the record marker */
- if (xprt->stream) {
- u32 *marker = req->rq_svec[0].iov_base;
+ xs_encode_tcp_record_marker(&req->rq_snd_buf);
- *marker = htonl(0x80000000|(req->rq_slen-sizeof(*marker)));
- }
+ xs_pktdump("packet data:",
+ req->rq_svec->iov_base,
+ req->rq_svec->iov_len);
/* Continue transmitting the packet/record. We must be careful
* to cope with writespace callbacks arriving _after_ we have
- * called sendmsg().
- */
+ * called sendmsg(). */
while (1) {
req->rq_xtime = jiffies;
- status = xs_sendmsg(xprt, req);
+ status = xs_sendpages(xprt->sock, NULL, 0, xdr,
+ req->rq_bytes_sent);
- if (status < 0)
- break;
+ dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
+ xdr->len - req->rq_bytes_sent, status);
- if (xprt->stream) {
- req->rq_bytes_sent += status;
-
- /* If we've sent the entire packet, immediately
- * reset the count of bytes sent. */
- if (req->rq_bytes_sent >= req->rq_slen) {
- req->rq_bytes_sent = 0;
- return 0;
- }
- } else {
- if (status >= req->rq_slen)
- return 0;
- status = -EAGAIN;
+ if (unlikely(status < 0))
break;
- }
- dprintk("RPC: %4d xmit incomplete (%d left of %d)\n",
- task->tk_pid, req->rq_slen - req->rq_bytes_sent,
- req->rq_slen);
+ /* If we've sent the entire packet, immediately
+ * reset the count of bytes sent. */
+ req->rq_bytes_sent += status;
+ if (likely(req->rq_bytes_sent >= req->rq_slen)) {
+ req->rq_bytes_sent = 0;
+ return 0;
+ }
status = -EAGAIN;
- if (retry++ > 50)
+ if (retry++ > XS_SENDMSG_RETRY)
break;
}
- if (status == -EAGAIN) {
- if (test_bit(SOCK_ASYNC_NOSPACE, &xprt->sock->flags)) {
- /* Protect against races with xs_write_space */
- spin_lock_bh(&xprt->transport_lock);
- /* Don't race with disconnect */
- if (!xprt_connected(xprt))
- task->tk_status = -ENOTCONN;
- else if (test_bit(SOCK_NOSPACE, &xprt->sock->flags)) {
- task->tk_timeout = req->rq_timeout;
- rpc_sleep_on(&xprt->pending, task, NULL, NULL);
- }
- spin_unlock_bh(&xprt->transport_lock);
- return status;
- }
- /* Keep holding the socket if it is blocked */
- rpc_delay(task, HZ>>4);
+ switch (status) {
+ case -EAGAIN:
+ xs_nospace(task);
+ break;
+ case -ECONNREFUSED:
+ case -ECONNRESET:
+ case -ENOTCONN:
+ case -EPIPE:
+ status = -ENOTCONN;
+ break;
+ default:
+ dprintk("RPC: sendmsg returned unrecognized error %d\n",
+ -status);
+ xprt_disconnect(xprt);
+ break;
}
+
return status;
}
* xs_close - close a socket
* @xprt: transport
*
+ * This is used when all requests are complete; ie, no DRC state remains
+ * on the server we want to save.
*/
static void xs_close(struct rpc_xprt *xprt)
{
{
dprintk("RPC: xs_destroy xprt %p\n", xprt);
- cancel_delayed_work(&xprt->sock_connect);
+ cancel_delayed_work(&xprt->connect_worker);
flush_scheduled_work();
xprt_disconnect(xprt);
goto out_unlock;
task = rovr->rq_task;
- dprintk("RPC: %4d received reply\n", task->tk_pid);
-
if ((copied = rovr->rq_private_buf.buflen) > repsize)
copied = repsize;
/* Something worked... */
dst_confirm(skb->dst);
- xprt_complete_rqst(xprt, rovr, copied);
+ xprt_adjust_cwnd(task, copied);
+ xprt_update_rtt(task);
+ xprt_complete_rqst(task, copied);
out_unlock:
spin_unlock(&xprt->transport_lock);
xprt->tcp_offset += used;
if (used != len)
return;
+
xprt->tcp_reclen = ntohl(xprt->tcp_recm);
- if (xprt->tcp_reclen & 0x80000000)
+ if (xprt->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
xprt->tcp_flags |= XPRT_LAST_FRAG;
else
xprt->tcp_flags &= ~XPRT_LAST_FRAG;
- xprt->tcp_reclen &= 0x7fffffff;
+ xprt->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
+
xprt->tcp_flags &= ~XPRT_COPY_RECM;
xprt->tcp_offset = 0;
+
/* Sanity check of the record length */
- if (xprt->tcp_reclen < 4) {
+ if (unlikely(xprt->tcp_reclen < 4)) {
dprintk("RPC: invalid TCP record fragment length\n");
xprt_disconnect(xprt);
return;
}
out:
- if (!(xprt->tcp_flags & XPRT_COPY_DATA)) {
- dprintk("RPC: %4d received reply complete\n",
- req->rq_task->tk_pid);
- xprt_complete_rqst(xprt, req, xprt->tcp_copied);
- }
+ if (!(xprt->tcp_flags & XPRT_COPY_DATA))
+ xprt_complete_rqst(req->rq_task, xprt->tcp_copied);
spin_unlock(&xprt->transport_lock);
xs_tcp_check_recm(xprt);
}
xprt->tcp_reclen = 0;
xprt->tcp_copied = 0;
xprt->tcp_flags = XPRT_COPY_RECM | XPRT_COPY_XID;
- rpc_wake_up(&xprt->pending);
+ xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
+ xprt_wake_pending_tasks(xprt, 0);
}
spin_unlock_bh(&xprt->transport_lock);
break;
}
/**
- * xs_write_space - callback invoked when socket buffer space becomes
- * available
+ * xs_udp_write_space - callback invoked when socket buffer space
+ * becomes available
* @sk: socket whose state has changed
*
* Called when more output buffer space is available for this socket.
* We try not to wake our writers until they can make "significant"
- * progress, otherwise we'll waste resources thrashing sock_sendmsg
+ * progress, otherwise we'll waste resources thrashing kernel_sendmsg
* with a bunch of small requests.
*/
-static void xs_write_space(struct sock *sk)
+static void xs_udp_write_space(struct sock *sk)
{
- struct rpc_xprt *xprt;
- struct socket *sock;
-
read_lock(&sk->sk_callback_lock);
- if (!(xprt = xprt_from_sock(sk)) || !(sock = sk->sk_socket))
- goto out;
- if (xprt->shutdown)
- goto out;
- /* Wait until we have enough socket memory */
- if (xprt->stream) {
- /* from net/core/stream.c:sk_stream_write_space */
- if (sk_stream_wspace(sk) < sk_stream_min_wspace(sk))
+ /* from net/core/sock.c:sock_def_write_space */
+ if (sock_writeable(sk)) {
+ struct socket *sock;
+ struct rpc_xprt *xprt;
+
+ if (unlikely(!(sock = sk->sk_socket)))
goto out;
- } else {
- /* from net/core/sock.c:sock_def_write_space */
- if (!sock_writeable(sk))
+ if (unlikely(!(xprt = xprt_from_sock(sk))))
+ goto out;
+ if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
goto out;
- }
- if (!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))
- goto out;
+ xprt_write_space(xprt);
+ }
- spin_lock_bh(&xprt->transport_lock);
- if (xprt->snd_task)
- rpc_wake_up_task(xprt->snd_task);
- spin_unlock_bh(&xprt->transport_lock);
-out:
+ out:
read_unlock(&sk->sk_callback_lock);
}
/**
- * xs_set_buffer_size - set send and receive limits
- * @xprt: generic transport
+ * xs_tcp_write_space - callback invoked when socket buffer space
+ * becomes available
+ * @sk: socket whose state has changed
*
- * Set socket send and receive limits based on the
- * sndsize and rcvsize fields in the generic transport
- * structure. This applies only to UDP sockets.
+ * Called when more output buffer space is available for this socket.
+ * We try not to wake our writers until they can make "significant"
+ * progress, otherwise we'll waste resources thrashing kernel_sendmsg
+ * with a bunch of small requests.
*/
-static void xs_set_buffer_size(struct rpc_xprt *xprt)
+static void xs_tcp_write_space(struct sock *sk)
+{
+ read_lock(&sk->sk_callback_lock);
+
+ /* from net/core/stream.c:sk_stream_write_space */
+ if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
+ struct socket *sock;
+ struct rpc_xprt *xprt;
+
+ if (unlikely(!(sock = sk->sk_socket)))
+ goto out;
+ if (unlikely(!(xprt = xprt_from_sock(sk))))
+ goto out;
+ if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
+ goto out;
+
+ xprt_write_space(xprt);
+ }
+
+ out:
+ read_unlock(&sk->sk_callback_lock);
+}
+
+static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
{
struct sock *sk = xprt->inet;
- if (xprt->stream)
- return;
if (xprt->rcvsize) {
sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
sk->sk_rcvbuf = xprt->rcvsize * xprt->max_reqs * 2;
}
}
+/**
+ * xs_udp_set_buffer_size - set send and receive limits
+ * @xprt: generic transport
+ * @sndsize: requested size of send buffer, in bytes
+ * @rcvsize: requested size of receive buffer, in bytes
+ *
+ * Set socket send and receive buffer size limits.
+ */
+static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
+{
+ xprt->sndsize = 0;
+ if (sndsize)
+ xprt->sndsize = sndsize + 1024;
+ xprt->rcvsize = 0;
+ if (rcvsize)
+ xprt->rcvsize = rcvsize + 1024;
+
+ xs_udp_do_set_buffer_size(xprt);
+}
+
+/**
+ * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
+ * @task: task that timed out
+ *
+ * Adjust the congestion window after a retransmit timeout has occurred.
+ */
+static void xs_udp_timer(struct rpc_task *task)
+{
+ xprt_adjust_cwnd(task, -ETIMEDOUT);
+}
+
+/**
+ * xs_set_port - reset the port number in the remote endpoint address
+ * @xprt: generic transport
+ * @port: new port number
+ *
+ */
+static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
+{
+ dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
+ xprt->addr.sin_port = htons(port);
+}
+
static int xs_bindresvport(struct rpc_xprt *xprt, struct socket *sock)
{
struct sockaddr_in myaddr = {
.sin_family = AF_INET,
};
- int err, port;
+ int err;
+ unsigned short port = xprt->port;
- /* Were we already bound to a given port? Try to reuse it */
- port = xprt->port;
do {
myaddr.sin_port = htons(port);
err = sock->ops->bind(sock, (struct sockaddr *) &myaddr,
port);
return 0;
}
- if (--port == 0)
- port = XS_MAX_RESVPORT;
+ if (port <= xprt_min_resvport)
+ port = xprt_max_resvport;
+ else
+ port--;
} while (err == -EADDRINUSE && port != xprt->port);
dprintk("RPC: can't bind to reserved port (%d).\n", -err);
return err;
}
-static struct socket *xs_create(struct rpc_xprt *xprt, int proto, int resvport)
+/**
+ * xs_udp_connect_worker - set up a UDP socket
+ * @args: RPC transport to connect
+ *
+ * Invoked by a work queue tasklet.
+ */
+static void xs_udp_connect_worker(void *args)
{
- struct socket *sock;
- int type, err;
-
- dprintk("RPC: xs_create(%s %d)\n",
- (proto == IPPROTO_UDP)? "udp" : "tcp", proto);
+ struct rpc_xprt *xprt = (struct rpc_xprt *) args;
+ struct socket *sock = xprt->sock;
+ int err, status = -EIO;
- type = (proto == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
+ if (xprt->shutdown || xprt->addr.sin_port == 0)
+ goto out;
- if ((err = sock_create_kern(PF_INET, type, proto, &sock)) < 0) {
- dprintk("RPC: can't create socket (%d).\n", -err);
- return NULL;
- }
+ dprintk("RPC: xs_udp_connect_worker for xprt %p\n", xprt);
- /* If the caller has the capability, bind to a reserved port */
- if (resvport && xs_bindresvport(xprt, sock) < 0)
- goto failed;
+ /* Start by resetting any existing state */
+ xs_close(xprt);
- return sock;
+ if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
+ dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
+ goto out;
+ }
-failed:
- sock_release(sock);
- return NULL;
-}
+ if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) {
+ sock_release(sock);
+ goto out;
+ }
-static void xs_bind(struct rpc_xprt *xprt, struct socket *sock)
-{
- struct sock *sk = sock->sk;
+ if (!xprt->inet) {
+ struct sock *sk = sock->sk;
- if (xprt->inet)
- return;
+ write_lock_bh(&sk->sk_callback_lock);
- write_lock_bh(&sk->sk_callback_lock);
- sk->sk_user_data = xprt;
- xprt->old_data_ready = sk->sk_data_ready;
- xprt->old_state_change = sk->sk_state_change;
- xprt->old_write_space = sk->sk_write_space;
- if (xprt->prot == IPPROTO_UDP) {
+ sk->sk_user_data = xprt;
+ xprt->old_data_ready = sk->sk_data_ready;
+ xprt->old_state_change = sk->sk_state_change;
+ xprt->old_write_space = sk->sk_write_space;
sk->sk_data_ready = xs_udp_data_ready;
+ sk->sk_write_space = xs_udp_write_space;
sk->sk_no_check = UDP_CSUM_NORCV;
+ sk->sk_allocation = GFP_ATOMIC;
+
xprt_set_connected(xprt);
- } else {
- tcp_sk(sk)->nonagle = 1; /* disable Nagle's algorithm */
- sk->sk_data_ready = xs_tcp_data_ready;
- sk->sk_state_change = xs_tcp_state_change;
- xprt_clear_connected(xprt);
+
+ /* Reset to new socket */
+ xprt->sock = sock;
+ xprt->inet = sk;
+
+ write_unlock_bh(&sk->sk_callback_lock);
}
- sk->sk_write_space = xs_write_space;
+ xs_udp_do_set_buffer_size(xprt);
+ status = 0;
+out:
+ xprt_wake_pending_tasks(xprt, status);
+ xprt_clear_connecting(xprt);
+}
- /* Reset to new socket */
- xprt->sock = sock;
- xprt->inet = sk;
- write_unlock_bh(&sk->sk_callback_lock);
+/*
+ * We need to preserve the port number so the reply cache on the server can
+ * find our cached RPC replies when we get around to reconnecting.
+ */
+static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
+{
+ int result;
+ struct socket *sock = xprt->sock;
+ struct sockaddr any;
- return;
+ dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
+
+ /*
+ * Disconnect the transport socket by doing a connect operation
+ * with AF_UNSPEC. This should return immediately...
+ */
+ memset(&any, 0, sizeof(any));
+ any.sa_family = AF_UNSPEC;
+ result = sock->ops->connect(sock, &any, sizeof(any), 0);
+ if (result)
+ dprintk("RPC: AF_UNSPEC connect return code %d\n",
+ result);
}
/**
- * xs_connect_worker - try to connect a socket to a remote endpoint
+ * xs_tcp_connect_worker - connect a TCP socket to a remote endpoint
* @args: RPC transport to connect
*
* Invoked by a work queue tasklet.
*/
-static void xs_connect_worker(void *args)
+static void xs_tcp_connect_worker(void *args)
{
struct rpc_xprt *xprt = (struct rpc_xprt *)args;
struct socket *sock = xprt->sock;
- int status = -EIO;
+ int err, status = -EIO;
if (xprt->shutdown || xprt->addr.sin_port == 0)
goto out;
- dprintk("RPC: xs_connect_worker xprt %p\n", xprt);
+ dprintk("RPC: xs_tcp_connect_worker for xprt %p\n", xprt);
- /*
- * Start by resetting any existing state
- */
- xs_close(xprt);
- sock = xs_create(xprt, xprt->prot, xprt->resvport);
- if (sock == NULL) {
- /* couldn't create socket or bind to reserved port;
- * this is likely a permanent error, so cause an abort */
- goto out;
- }
- xs_bind(xprt, sock);
- xs_set_buffer_size(xprt);
+ if (!xprt->sock) {
+ /* start from scratch */
+ if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
+ dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
+ goto out;
+ }
- status = 0;
- if (!xprt->stream)
- goto out;
+ if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) {
+ sock_release(sock);
+ goto out;
+ }
+ } else
+ /* "close" the socket, preserving the local port */
+ xs_tcp_reuse_connection(xprt);
- /*
- * Tell the socket layer to start connecting...
- */
+ if (!xprt->inet) {
+ struct sock *sk = sock->sk;
+
+ write_lock_bh(&sk->sk_callback_lock);
+
+ sk->sk_user_data = xprt;
+ xprt->old_data_ready = sk->sk_data_ready;
+ xprt->old_state_change = sk->sk_state_change;
+ xprt->old_write_space = sk->sk_write_space;
+ sk->sk_data_ready = xs_tcp_data_ready;
+ sk->sk_state_change = xs_tcp_state_change;
+ sk->sk_write_space = xs_tcp_write_space;
+ sk->sk_allocation = GFP_ATOMIC;
+
+ /* socket options */
+ sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
+ sock_reset_flag(sk, SOCK_LINGER);
+ tcp_sk(sk)->linger2 = 0;
+ tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
+
+ xprt_clear_connected(xprt);
+
+ /* Reset to new socket */
+ xprt->sock = sock;
+ xprt->inet = sk;
+
+ write_unlock_bh(&sk->sk_callback_lock);
+ }
+
+ /* Tell the socket layer to start connecting... */
status = sock->ops->connect(sock, (struct sockaddr *) &xprt->addr,
sizeof(xprt->addr), O_NONBLOCK);
dprintk("RPC: %p connect status %d connected %d sock state %d\n",
case -EINPROGRESS:
case -EALREADY:
goto out_clear;
+ case -ECONNREFUSED:
+ case -ECONNRESET:
+ /* retry with existing socket, after a delay */
+ break;
+ default:
+ /* get rid of existing socket, and retry */
+ xs_close(xprt);
+ break;
}
}
out:
- if (status < 0)
- rpc_wake_up_status(&xprt->pending, status);
- else
- rpc_wake_up(&xprt->pending);
+ xprt_wake_pending_tasks(xprt, status);
out_clear:
- smp_mb__before_clear_bit();
- clear_bit(XPRT_CONNECTING, &xprt->sockstate);
- smp_mb__after_clear_bit();
+ xprt_clear_connecting(xprt);
}
/**
* @task: address of RPC task that manages state of connect request
*
* TCP: If the remote end dropped the connection, delay reconnecting.
+ *
+ * UDP socket connects are synchronous, but we use a work queue anyway
+ * to guarantee that even unprivileged user processes can set up a
+ * socket on a privileged port.
+ *
+ * If a UDP socket connect fails, the delay behavior here prevents
+ * retry floods (hard mounts).
*/
static void xs_connect(struct rpc_task *task)
{
struct rpc_xprt *xprt = task->tk_xprt;
- if (!test_and_set_bit(XPRT_CONNECTING, &xprt->sockstate)) {
- if (xprt->sock != NULL) {
- dprintk("RPC: xs_connect delayed xprt %p\n", xprt);
- schedule_delayed_work(&xprt->sock_connect,
- RPC_REESTABLISH_TIMEOUT);
- } else {
- dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
- schedule_work(&xprt->sock_connect);
- /* flush_scheduled_work can sleep... */
- if (!RPC_IS_ASYNC(task))
- flush_scheduled_work();
- }
+ if (xprt_test_and_set_connecting(xprt))
+ return;
+
+ if (xprt->sock != NULL) {
+ dprintk("RPC: xs_connect delayed xprt %p for %lu seconds\n",
+ xprt, xprt->reestablish_timeout / HZ);
+ schedule_delayed_work(&xprt->connect_worker,
+ xprt->reestablish_timeout);
+ xprt->reestablish_timeout <<= 1;
+ if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
+ xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
+ } else {
+ dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
+ schedule_work(&xprt->connect_worker);
+
+ /* flush_scheduled_work can sleep... */
+ if (!RPC_IS_ASYNC(task))
+ flush_scheduled_work();
}
}
-static struct rpc_xprt_ops xs_ops = {
- .set_buffer_size = xs_set_buffer_size,
+static struct rpc_xprt_ops xs_udp_ops = {
+ .set_buffer_size = xs_udp_set_buffer_size,
+ .reserve_xprt = xprt_reserve_xprt_cong,
+ .release_xprt = xprt_release_xprt_cong,
+ .set_port = xs_set_port,
.connect = xs_connect,
- .send_request = xs_send_request,
+ .buf_alloc = rpc_malloc,
+ .buf_free = rpc_free,
+ .send_request = xs_udp_send_request,
+ .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
+ .timer = xs_udp_timer,
+ .release_request = xprt_release_rqst_cong,
.close = xs_close,
.destroy = xs_destroy,
};
-extern unsigned int xprt_udp_slot_table_entries;
-extern unsigned int xprt_tcp_slot_table_entries;
+static struct rpc_xprt_ops xs_tcp_ops = {
+ .reserve_xprt = xprt_reserve_xprt,
+ .release_xprt = xprt_release_xprt,
+ .set_port = xs_set_port,
+ .connect = xs_connect,
+ .buf_alloc = rpc_malloc,
+ .buf_free = rpc_free,
+ .send_request = xs_tcp_send_request,
+ .set_retrans_timeout = xprt_set_retrans_timeout_def,
+ .close = xs_close,
+ .destroy = xs_destroy,
+};
/**
* xs_setup_udp - Set up transport to use a UDP socket
memset(xprt->slot, 0, slot_table_size);
xprt->prot = IPPROTO_UDP;
- xprt->port = XS_MAX_RESVPORT;
- xprt->stream = 0;
- xprt->nocong = 0;
- xprt->cwnd = RPC_INITCWND;
+ xprt->port = xprt_max_resvport;
+ xprt->tsh_size = 0;
xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;
/* XXX: header size can vary due to auth type, IPv6, etc. */
xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
- INIT_WORK(&xprt->sock_connect, xs_connect_worker, xprt);
+ INIT_WORK(&xprt->connect_worker, xs_udp_connect_worker, xprt);
+ xprt->bind_timeout = XS_BIND_TO;
+ xprt->connect_timeout = XS_UDP_CONN_TO;
+ xprt->reestablish_timeout = XS_UDP_REEST_TO;
+ xprt->idle_timeout = XS_IDLE_DISC_TO;
- xprt->ops = &xs_ops;
+ xprt->ops = &xs_udp_ops;
if (to)
xprt->timeout = *to;
memset(xprt->slot, 0, slot_table_size);
xprt->prot = IPPROTO_TCP;
- xprt->port = XS_MAX_RESVPORT;
- xprt->stream = 1;
- xprt->nocong = 1;
- xprt->cwnd = RPC_MAXCWND(xprt);
+ xprt->port = xprt_max_resvport;
+ xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;
- xprt->max_payload = (1U << 31) - 1;
+ xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
- INIT_WORK(&xprt->sock_connect, xs_connect_worker, xprt);
+ INIT_WORK(&xprt->connect_worker, xs_tcp_connect_worker, xprt);
+ xprt->bind_timeout = XS_BIND_TO;
+ xprt->connect_timeout = XS_TCP_CONN_TO;
+ xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
+ xprt->idle_timeout = XS_IDLE_DISC_TO;
- xprt->ops = &xs_ops;
+ xprt->ops = &xs_tcp_ops;
if (to)
xprt->timeout = *to;
projects / powerpc.git / blobdiff