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Commit a246b010 authored by Chuck Lever's avatar Chuck Lever Committed by Trond Myklebust
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[PATCH] RPC: introduce client-side transport switch 

 Move the bulk of client-side socket-specific code into a separate source
 file, net/sunrpc/xprtsock.c.

 Test-plan:
 Millions of fsx operations.  Performance characterization such as "sio" or
 "iozone".  Destructive testing (unplugging the network temporarily, server
 reboots).  Connectathon with v2, v3, and v4.

 Version: Thu, 11 Aug 2005 16:03:38 -0400
Signed-off-by: default avatarChuck Lever <cel@netapp.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 094bb20b
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Inline Side-by-side
Showing with 1101 additions and 989 deletions
include/linux/sunrpc/xdr.h
View file @ a246b010
......@@ -165,11 +165,6 @@ extern int csum_partial_copy_to_xdr(struct xdr_buf *, struct sk_buff *);
extern ssize_t xdr_partial_copy_from_skb(struct xdr_buf *, unsigned int,
skb_reader_t *, skb_read_actor_t);
struct socket;
struct sockaddr;
extern int xdr_sendpages(struct socket *, struct sockaddr *, int,
struct xdr_buf *, unsigned int, int);
extern int xdr_encode_word(struct xdr_buf *, int, u32);
extern int xdr_decode_word(struct xdr_buf *, int, u32 *);
......
include/linux/sunrpc/xprt.h
View file @ a246b010
......@@ -59,7 +59,13 @@ extern unsigned int xprt_tcp_slot_table_entries;
*/
#define RPC_REESTABLISH_TIMEOUT (15*HZ)
/* RPC call and reply header size as number of 32bit words (verifier
/*
* RPC transport idle timeout.
*/
#define RPC_IDLE_DISCONNECT_TIMEOUT (5*60*HZ)
/*
* RPC call and reply header size as number of 32bit words (verifier
* size computed separately)
*/
#define RPC_CALLHDRSIZE 6
......@@ -121,12 +127,19 @@ struct rpc_rqst {
#define rq_svec rq_snd_buf.head
#define rq_slen rq_snd_buf.len
#define XPRT_LAST_FRAG (1 << 0)
#define XPRT_COPY_RECM (1 << 1)
#define XPRT_COPY_XID (1 << 2)
#define XPRT_COPY_DATA (1 << 3)
struct rpc_task;
struct rpc_xprt;
struct rpc_xprt_ops {
void (*set_buffer_size)(struct rpc_xprt *xprt);
void (*connect)(struct rpc_task *task);
int (*send_request)(struct rpc_task *task);
void (*close)(struct rpc_xprt *xprt);
void (*destroy)(struct rpc_xprt *xprt);
};
struct rpc_xprt {
struct rpc_xprt_ops * ops; /* transport methods */
struct socket * sock; /* BSD socket layer */
struct sock * inet; /* INET layer */
......@@ -199,14 +212,22 @@ struct rpc_xprt {
wait_queue_head_t cong_wait;
};
#define XPRT_LAST_FRAG (1 << 0)
#define XPRT_COPY_RECM (1 << 1)
#define XPRT_COPY_XID (1 << 2)
#define XPRT_COPY_DATA (1 << 3)
#ifdef __KERNEL__
struct rpc_xprt * xprt_create_proto(int proto, struct sockaddr_in *addr,
struct rpc_timeout *toparms);
void xprt_disconnect(struct rpc_xprt *);
int xprt_destroy(struct rpc_xprt *);
void xprt_set_timeout(struct rpc_timeout *, unsigned int,
unsigned long);
struct rpc_rqst * xprt_lookup_rqst(struct rpc_xprt *, u32);
void xprt_complete_rqst(struct rpc_xprt *,
struct rpc_rqst *, int);
void xprt_reserve(struct rpc_task *);
int xprt_prepare_transmit(struct rpc_task *);
void xprt_transmit(struct rpc_task *);
......@@ -214,7 +235,10 @@ void xprt_receive(struct rpc_task *);
int xprt_adjust_timeout(struct rpc_rqst *req);
void xprt_release(struct rpc_task *);
void xprt_connect(struct rpc_task *);
void xprt_sock_setbufsize(struct rpc_xprt *);
int xs_setup_udp(struct rpc_xprt *,
struct rpc_timeout *);
int xs_setup_tcp(struct rpc_xprt *,
struct rpc_timeout *);
#define XPRT_LOCKED 0
#define XPRT_CONNECT 1
......
net/sunrpc/Makefile
View file @ a246b010
......@@ -6,7 +6,7 @@
obj-$(CONFIG_SUNRPC) += sunrpc.o
obj-$(CONFIG_SUNRPC_GSS) += auth_gss/
sunrpc-y := clnt.o xprt.o socklib.o sched.o \
sunrpc-y := clnt.o xprt.o socklib.o xprtsock.o sched.o \
auth.o auth_null.o auth_unix.o \
svc.o svcsock.o svcauth.o svcauth_unix.o \
pmap_clnt.o timer.o xdr.o \
......
net/sunrpc/clnt.c
View file @ a246b010
......@@ -525,8 +525,7 @@ rpc_setbufsize(struct rpc_clnt *clnt, unsigned int sndsize, unsigned int rcvsize
xprt->rcvsize = 0;
if (rcvsize)
xprt->rcvsize = rcvsize + RPC_SLACK_SPACE;
if (xprt_connected(xprt))
xprt_sock_setbufsize(xprt);
xprt->ops->set_buffer_size(xprt);
}
/*
......
net/sunrpc/sysctl.c
View file @ a246b010
......@@ -119,6 +119,9 @@ proc_dodebug(ctl_table *table, int write, struct file *file,
return 0;
}
unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
......
net/sunrpc/xdr.c
View file @ a246b010
......@@ -6,15 +6,12 @@
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/pagemap.h>
#include <linux/errno.h>
#include <linux/in.h>
#include <linux/net.h>
#include <net/sock.h>
#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/msg_prot.h>
......@@ -177,103 +174,6 @@ xdr_inline_pages(struct xdr_buf *xdr, unsigned int offset,
}
int
xdr_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen,
struct xdr_buf *xdr, unsigned int base, int msgflags)
{
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);
len = xdr->head[0].iov_len;
if (base < len || (addr != NULL && base == 0)) {
struct kvec iov = {
.iov_base = xdr->head[0].iov_base + base,
.iov_len = len - base,
};
struct msghdr msg = {
.msg_name = addr,
.msg_namelen = addrlen,
.msg_flags = msgflags,
};
if (xdr->len > len)
msg.msg_flags |= MSG_MORE;
if (iov.iov_len != 0)
err = kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
else
err = kernel_sendmsg(sock, &msg, NULL, 0, 0);
if (ret == 0)
ret = err;
else if (err > 0)
ret += err;
if (err != iov.iov_len)
goto out;
base = 0;
} else
base -= len;
if (pglen == 0)
goto copy_tail;
if (base >= pglen) {
base -= pglen;
goto copy_tail;
}
if (base || xdr->page_base) {
pglen -= base;
base += xdr->page_base;
ppage += base >> PAGE_CACHE_SHIFT;
base &= ~PAGE_CACHE_MASK;
}
sendpage = sock->ops->sendpage ? : sock_no_sendpage;
do {
int flags = msgflags;
len = PAGE_CACHE_SIZE;
if (base)
len -= base;
if (pglen < len)
len = pglen;
if (pglen != len || xdr->tail[0].iov_len != 0)
flags |= MSG_MORE;
/* Hmm... We might be dealing with highmem pages */
if (PageHighMem(*ppage))
sendpage = sock_no_sendpage;
err = sendpage(sock, *ppage, base, len, flags);
if (ret == 0)
ret = err;
else if (err > 0)
ret += err;
if (err != len)
goto out;
base = 0;
ppage++;
} while ((pglen -= len) != 0);
copy_tail:
len = xdr->tail[0].iov_len;
if (base < len) {
struct kvec iov = {
.iov_base = xdr->tail[0].iov_base + base,
.iov_len = len - base,
};
struct msghdr msg = {
.msg_flags = msgflags,
};
err = kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
if (ret == 0)
ret = err;
else if (err > 0)
ret += err;
}
out:
return ret;
}
/*
* Helper routines for doing 'memmove' like operations on a struct xdr_buf
*
......
net/sunrpc/xprt.c
View file @ a246b010
......@@ -32,37 +32,16 @@
* tasks that rely on callbacks.
*
* Copyright (C) 1995-1997, Olaf Kirch <okir@monad.swb.de>
*
* TCP callback races fixes (C) 1998 Red Hat Software <alan@redhat.com>
* TCP send fixes (C) 1998 Red Hat Software <alan@redhat.com>
* TCP NFS related read + write fixes
* (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
*
* 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>
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/capability.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/net.h>
#include <linux/mm.h>
#include <linux/udp.h>
#include <linux/tcp.h>
#include <linux/sunrpc/clnt.h>
#include <linux/file.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/random.h>
#include <net/sock.h>
#include <net/checksum.h>
#include <net/udp.h>
#include <net/tcp.h>
#include <linux/sunrpc/clnt.h>
/*
* Local variables
......@@ -74,64 +53,17 @@
#endif
#define XPRT_MAX_BACKOFF (8)
#define XPRT_IDLE_TIMEOUT (5*60*HZ)
#define XPRT_MAX_RESVPORT (800)
/*
* Local functions
*/
static void xprt_request_init(struct rpc_task *, struct rpc_xprt *);
static inline void do_xprt_reserve(struct rpc_task *);
static void xprt_disconnect(struct rpc_xprt *);
static void xprt_connect_status(struct rpc_task *task);
static struct rpc_xprt * xprt_setup(int proto, struct sockaddr_in *ap,
struct rpc_timeout *to);
static struct socket *xprt_create_socket(struct rpc_xprt *, int, int);
static void xprt_bind_socket(struct rpc_xprt *, struct socket *);
static int __xprt_get_cong(struct rpc_xprt *, struct rpc_task *);
static int xprt_clear_backlog(struct rpc_xprt *xprt);
#ifdef RPC_DEBUG_DATA
/*
* Print the buffer contents (first 128 bytes only--just enough for
* diropres return).
*/
static void
xprt_pktdump(char *msg, u32 *packet, unsigned int count)
{
u8 *buf = (u8 *) packet;
int j;
dprintk("RPC: %s\n", msg);
for (j = 0; j < count && j < 128; j += 4) {
if (!(j & 31)) {
if (j)
dprintk("\n");
dprintk("0x%04x ", j);
}
dprintk("%02x%02x%02x%02x ",
buf[j], buf[j+1], buf[j+2], buf[j+3]);
}
dprintk("\n");
}
#else
static inline void
xprt_pktdump(char *msg, u32 *packet, unsigned int count)
{
/* NOP */
}
#endif
/*
* Look up RPC transport given an INET socket
*/
static inline struct rpc_xprt *
xprt_from_sock(struct sock *sk)
{
return (struct rpc_xprt *) sk->sk_user_data;
}
/*
* Serialize write access to sockets, in order to prevent different
* requests from interfering with each other.
......@@ -234,62 +166,6 @@ xprt_release_write(struct rpc_xprt *xprt, struct rpc_task *task)
spin_unlock_bh(&xprt->sock_lock);
}
/*
* Write data to socket.
*/
static inline int
xprt_sendmsg(struct rpc_xprt *xprt, struct rpc_rqst *req)
{
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;
if (!sock)
return -ENOTCONN;
xprt_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);
}
/* Dont repeat bytes */
skip = req->rq_bytes_sent;
clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
result = xdr_sendpages(sock, addr, addrlen, xdr, skip, MSG_DONTWAIT);
dprintk("RPC: xprt_sendmsg(%d) = %d\n", xdr->len - skip, result);
if (result >= 0)
return result;
switch (result) {
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;
break;
default:
printk(KERN_NOTICE "RPC: sendmsg returned error %d\n", -result);
}
return result;
}
/*
* Van Jacobson congestion avoidance. Check if the congestion window
* overflowed. Put the task to sleep if this is the case.
......@@ -405,48 +281,20 @@ int xprt_adjust_timeout(struct rpc_rqst *req)
return status;
}
/*
* Close down a transport socket
*/
static void
xprt_close(struct rpc_xprt *xprt)
{
struct socket *sock = xprt->sock;
struct sock *sk = xprt->inet;
if (!sk)
return;
write_lock_bh(&sk->sk_callback_lock);
xprt->inet = NULL;
xprt->sock = NULL;
sk->sk_user_data = NULL;
sk->sk_data_ready = xprt->old_data_ready;
sk->sk_state_change = xprt->old_state_change;
sk->sk_write_space = xprt->old_write_space;
write_unlock_bh(&sk->sk_callback_lock);
sk->sk_no_check = 0;
sock_release(sock);
}
static void
xprt_socket_autoclose(void *args)
{
struct rpc_xprt *xprt = (struct rpc_xprt *)args;
xprt_disconnect(xprt);
xprt_close(xprt);
xprt->ops->close(xprt);
xprt_release_write(xprt, NULL);
}
/*
* Mark a transport as disconnected
*/
static void
xprt_disconnect(struct rpc_xprt *xprt)
void xprt_disconnect(struct rpc_xprt *xprt)
{
dprintk("RPC: disconnected transport %p\n", xprt);
spin_lock_bh(&xprt->sock_lock);
......@@ -479,57 +327,6 @@ xprt_init_autodisconnect(unsigned long data)
spin_unlock(&xprt->sock_lock);
}
static void xprt_socket_connect(void *args)
{
struct rpc_xprt *xprt = (struct rpc_xprt *)args;
struct socket *sock = xprt->sock;
int status = -EIO;
if (xprt->shutdown || xprt->addr.sin_port == 0)
goto out;
/*
* Start by resetting any existing state
*/
xprt_close(xprt);
sock = xprt_create_socket(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;
}
xprt_bind_socket(xprt, sock);
xprt_sock_setbufsize(xprt);
status = 0;
if (!xprt->stream)
goto out;
/*
* 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",
xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
if (status < 0) {
switch (status) {
case -EINPROGRESS:
case -EALREADY:
goto out_clear;
}
}
out:
if (status < 0)
rpc_wake_up_status(&xprt->pending, status);
else
rpc_wake_up(&xprt->pending);
out_clear:
smp_mb__before_clear_bit();
clear_bit(XPRT_CONNECTING, &xprt->sockstate);
smp_mb__after_clear_bit();
}
/*
* Attempt to connect a TCP socket.
*
......@@ -552,30 +349,16 @@ void xprt_connect(struct rpc_task *task)
if (!xprt_lock_write(xprt, task))
return;
if (xprt_connected(xprt))
goto out_write;
xprt_release_write(xprt, task);
else {
if (task->tk_rqstp)
task->tk_rqstp->rq_bytes_sent = 0;
if (task->tk_rqstp)
task->tk_rqstp->rq_bytes_sent = 0;
task->tk_timeout = RPC_CONNECT_TIMEOUT;
rpc_sleep_on(&xprt->pending, task, xprt_connect_status, NULL);
if (!test_and_set_bit(XPRT_CONNECTING, &xprt->sockstate)) {
/* Note: if we are here due to a dropped connection
* we delay reconnecting by RPC_REESTABLISH_TIMEOUT/HZ
* seconds
*/
if (xprt->sock != NULL)
schedule_delayed_work(&xprt->sock_connect,
RPC_REESTABLISH_TIMEOUT);
else {
schedule_work(&xprt->sock_connect);
if (!RPC_IS_ASYNC(task))
flush_scheduled_work();
}
task->tk_timeout = RPC_CONNECT_TIMEOUT;
rpc_sleep_on(&xprt->pending, task, xprt_connect_status, NULL);
xprt->ops->connect(task);
}
return;
out_write:
xprt_release_write(xprt, task);
}
/*
......@@ -624,8 +407,7 @@ xprt_connect_status(struct rpc_task *task)
/*
* Look up the RPC request corresponding to a reply, and then lock it.
*/
static inline struct rpc_rqst *
xprt_lookup_rqst(struct rpc_xprt *xprt, u32 xid)
struct rpc_rqst *xprt_lookup_rqst(struct rpc_xprt *xprt, u32 xid)
{
struct list_head *pos;
struct rpc_rqst *req = NULL;
......@@ -644,8 +426,7 @@ xprt_lookup_rqst(struct rpc_xprt *xprt, u32 xid)
* Complete reply received.
* The TCP code relies on us to remove the request from xprt->pending.
*/
static void
xprt_complete_rqst(struct rpc_xprt *xprt, struct rpc_rqst *req, int copied)
void xprt_complete_rqst(struct rpc_xprt *xprt, struct rpc_rqst *req, int copied)
{
struct rpc_task *task = req->rq_task;
struct rpc_clnt *clnt = task->tk_client;
......@@ -691,409 +472,6 @@ xprt_complete_rqst(struct rpc_xprt *xprt, struct rpc_rqst *req, int copied)
return;
}
/*
* Input handler for RPC replies. Called from a bottom half and hence
* atomic.
*/
static void
udp_data_ready(struct sock *sk, int len)
{
struct rpc_task *task;
struct rpc_xprt *xprt;
struct rpc_rqst *rovr;
struct sk_buff *skb;
int err, repsize, copied;
u32 _xid, *xp;
read_lock(&sk->sk_callback_lock);
dprintk("RPC: udp_data_ready...\n");
if (!(xprt = xprt_from_sock(sk))) {
printk("RPC: udp_data_ready request not found!\n");
goto out;
}
dprintk("RPC: udp_data_ready client %p\n", xprt);
if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
goto out;
if (xprt->shutdown)
goto dropit;
repsize = skb->len - sizeof(struct udphdr);
if (repsize < 4) {
printk("RPC: impossible RPC reply size %d!\n", repsize);
goto dropit;
}
/* Copy the XID from the skb... */
xp = skb_header_pointer(skb, sizeof(struct udphdr),
sizeof(_xid), &_xid);
if (xp == NULL)
goto dropit;
/* Look up and lock the request corresponding to the given XID */
spin_lock(&xprt->sock_lock);
rovr = xprt_lookup_rqst(xprt, *xp);
if (!rovr)
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;
/* Suck it into the iovec, verify checksum if not done by hw. */
if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb))
goto out_unlock;
/* Something worked... */
dst_confirm(skb->dst);
xprt_complete_rqst(xprt, rovr, copied);
out_unlock:
spin_unlock(&xprt->sock_lock);
dropit:
skb_free_datagram(sk, skb);
out:
read_unlock(&sk->sk_callback_lock);
}
/*
* Copy from an skb into memory and shrink the skb.
*/
static inline size_t
tcp_copy_data(skb_reader_t *desc, void *p, size_t len)
{
if (len > desc->count)
len = desc->count;
if (skb_copy_bits(desc->skb, desc->offset, p, len)) {
dprintk("RPC: failed to copy %zu bytes from skb. %zu bytes remain\n",
len, desc->count);
return 0;
}
desc->offset += len;
desc->count -= len;
dprintk("RPC: copied %zu bytes from skb. %zu bytes remain\n",
len, desc->count);
return len;
}
/*
* TCP read fragment marker
*/
static inline void
tcp_read_fraghdr(struct rpc_xprt *xprt, skb_reader_t *desc)
{
size_t len, used;
char *p;
p = ((char *) &xprt->tcp_recm) + xprt->tcp_offset;
len = sizeof(xprt->tcp_recm) - xprt->tcp_offset;
used = tcp_copy_data(desc, p, len);
xprt->tcp_offset += used;
if (used != len)
return;
xprt->tcp_reclen = ntohl(xprt->tcp_recm);
if (xprt->tcp_reclen & 0x80000000)
xprt->tcp_flags |= XPRT_LAST_FRAG;
else
xprt->tcp_flags &= ~XPRT_LAST_FRAG;
xprt->tcp_reclen &= 0x7fffffff;
xprt->tcp_flags &= ~XPRT_COPY_RECM;
xprt->tcp_offset = 0;
/* Sanity check of the record length */
if (xprt->tcp_reclen < 4) {
printk(KERN_ERR "RPC: Invalid TCP record fragment length\n");
xprt_disconnect(xprt);
}
dprintk("RPC: reading TCP record fragment of length %d\n",
xprt->tcp_reclen);
}
static void
tcp_check_recm(struct rpc_xprt *xprt)
{
dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u, tcp_flags = %lx\n",
xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen, xprt->tcp_flags);
if (xprt->tcp_offset == xprt->tcp_reclen) {
xprt->tcp_flags |= XPRT_COPY_RECM;
xprt->tcp_offset = 0;
if (xprt->tcp_flags & XPRT_LAST_FRAG) {
xprt->tcp_flags &= ~XPRT_COPY_DATA;
xprt->tcp_flags |= XPRT_COPY_XID;
xprt->tcp_copied = 0;
}
}
}
/*
* TCP read xid
*/
static inline void
tcp_read_xid(struct rpc_xprt *xprt, skb_reader_t *desc)
{
size_t len, used;
char *p;
len = sizeof(xprt->tcp_xid) - xprt->tcp_offset;
dprintk("RPC: reading XID (%Zu bytes)\n", len);
p = ((char *) &xprt->tcp_xid) + xprt->tcp_offset;
used = tcp_copy_data(desc, p, len);
xprt->tcp_offset += used;
if (used != len)
return;
xprt->tcp_flags &= ~XPRT_COPY_XID;
xprt->tcp_flags |= XPRT_COPY_DATA;
xprt->tcp_copied = 4;
dprintk("RPC: reading reply for XID %08x\n",
ntohl(xprt->tcp_xid));
tcp_check_recm(xprt);
}
/*
* TCP read and complete request
*/
static inline void
tcp_read_request(struct rpc_xprt *xprt, skb_reader_t *desc)
{
struct rpc_rqst *req;
struct xdr_buf *rcvbuf;
size_t len;
ssize_t r;
/* Find and lock the request corresponding to this xid */
spin_lock(&xprt->sock_lock);
req = xprt_lookup_rqst(xprt, xprt->tcp_xid);
if (!req) {
xprt->tcp_flags &= ~XPRT_COPY_DATA;
dprintk("RPC: XID %08x request not found!\n",
ntohl(xprt->tcp_xid));
spin_unlock(&xprt->sock_lock);
return;
}
rcvbuf = &req->rq_private_buf;
len = desc->count;
if (len > xprt->tcp_reclen - xprt->tcp_offset) {
skb_reader_t my_desc;
len = xprt->tcp_reclen - xprt->tcp_offset;
memcpy(&my_desc, desc, sizeof(my_desc));
my_desc.count = len;
r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied,
&my_desc, tcp_copy_data);
desc->count -= r;
desc->offset += r;
} else
r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied,
desc, tcp_copy_data);
if (r > 0) {
xprt->tcp_copied += r;
xprt->tcp_offset += r;
}
if (r != len) {
/* Error when copying to the receive buffer,
* usually because we weren't able to allocate
* additional buffer pages. All we can do now
* is turn off XPRT_COPY_DATA, so the request
* will not receive any additional updates,
* and time out.
* Any remaining data from this record will
* be discarded.
*/
xprt->tcp_flags &= ~XPRT_COPY_DATA;
dprintk("RPC: XID %08x truncated request\n",
ntohl(xprt->tcp_xid));
dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n",
xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen);
goto out;
}
dprintk("RPC: XID %08x read %Zd bytes\n",
ntohl(xprt->tcp_xid), r);
dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n",
xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen);
if (xprt->tcp_copied == req->rq_private_buf.buflen)
xprt->tcp_flags &= ~XPRT_COPY_DATA;
else if (xprt->tcp_offset == xprt->tcp_reclen) {
if (xprt->tcp_flags & XPRT_LAST_FRAG)
xprt->tcp_flags &= ~XPRT_COPY_DATA;
}
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);
}
spin_unlock(&xprt->sock_lock);
tcp_check_recm(xprt);
}
/*
* TCP discard extra bytes from a short read
*/
static inline void
tcp_read_discard(struct rpc_xprt *xprt, skb_reader_t *desc)
{
size_t len;
len = xprt->tcp_reclen - xprt->tcp_offset;
if (len > desc->count)
len = desc->count;
desc->count -= len;
desc->offset += len;
xprt->tcp_offset += len;
dprintk("RPC: discarded %Zu bytes\n", len);
tcp_check_recm(xprt);
}
/*
* TCP record receive routine
* We first have to grab the record marker, then the XID, then the data.
*/
static int
tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
unsigned int offset, size_t len)
{
struct rpc_xprt *xprt = rd_desc->arg.data;
skb_reader_t desc = {
.skb = skb,
.offset = offset,
.count = len,
.csum = 0
};
dprintk("RPC: tcp_data_recv\n");
do {
/* Read in a new fragment marker if necessary */
/* Can we ever really expect to get completely empty fragments? */
if (xprt->tcp_flags & XPRT_COPY_RECM) {
tcp_read_fraghdr(xprt, &desc);
continue;
}
/* Read in the xid if necessary */
if (xprt->tcp_flags & XPRT_COPY_XID) {
tcp_read_xid(xprt, &desc);
continue;
}
/* Read in the request data */
if (xprt->tcp_flags & XPRT_COPY_DATA) {
tcp_read_request(xprt, &desc);
continue;
}
/* Skip over any trailing bytes on short reads */
tcp_read_discard(xprt, &desc);
} while (desc.count);
dprintk("RPC: tcp_data_recv done\n");
return len - desc.count;
}
static void tcp_data_ready(struct sock *sk, int bytes)
{
struct rpc_xprt *xprt;
read_descriptor_t rd_desc;
read_lock(&sk->sk_callback_lock);
dprintk("RPC: tcp_data_ready...\n");
if (!(xprt = xprt_from_sock(sk))) {
printk("RPC: tcp_data_ready socket info not found!\n");
goto out;
}
if (xprt->shutdown)
goto out;
/* We use rd_desc to pass struct xprt to tcp_data_recv */
rd_desc.arg.data = xprt;
rd_desc.count = 65536;
tcp_read_sock(sk, &rd_desc, tcp_data_recv);
out:
read_unlock(&sk->sk_callback_lock);
}
static void
tcp_state_change(struct sock *sk)
{
struct rpc_xprt *xprt;
read_lock(&sk->sk_callback_lock);
if (!(xprt = xprt_from_sock(sk)))
goto out;
dprintk("RPC: tcp_state_change client %p...\n", xprt);
dprintk("RPC: state %x conn %d dead %d zapped %d\n",
sk->sk_state, xprt_connected(xprt),
sock_flag(sk, SOCK_DEAD),
sock_flag(sk, SOCK_ZAPPED));
switch (sk->sk_state) {
case TCP_ESTABLISHED:
spin_lock_bh(&xprt->sock_lock);
if (!xprt_test_and_set_connected(xprt)) {
/* Reset TCP record info */
xprt->tcp_offset = 0;
xprt->tcp_reclen = 0;
xprt->tcp_copied = 0;
xprt->tcp_flags = XPRT_COPY_RECM | XPRT_COPY_XID;
rpc_wake_up(&xprt->pending);
}
spin_unlock_bh(&xprt->sock_lock);
break;
case TCP_SYN_SENT:
case TCP_SYN_RECV:
break;
default:
xprt_disconnect(xprt);
break;
}
out:
read_unlock(&sk->sk_callback_lock);
}
/*
* 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
* with a bunch of small requests.
*/
static void
xprt_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))
goto out;
} else {
/* from net/core/sock.c:sock_def_write_space */
if (!sock_writeable(sk))
goto out;
}
if (!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))
goto out;
spin_lock_bh(&xprt->sock_lock);
if (xprt->snd_task)
rpc_wake_up_task(xprt->snd_task);
spin_unlock_bh(&xprt->sock_lock);
out:
read_unlock(&sk->sk_callback_lock);
}
/*
* RPC receive timeout handler.
*/
......@@ -1161,19 +539,10 @@ xprt_transmit(struct rpc_task *task)
struct rpc_clnt *clnt = task->tk_client;
struct rpc_rqst *req = task->tk_rqstp;
struct rpc_xprt *xprt = req->rq_xprt;
int status, retry = 0;
int status;
dprintk("RPC: %4d xprt_transmit(%u)\n", task->tk_pid, req->rq_slen);
/* set up everything as needed. */
/* Write the record marker */
if (xprt->stream) {
u32 *marker = req->rq_svec[0].iov_base;
*marker = htonl(0x80000000|(req->rq_slen-sizeof(*marker)));
}
smp_rmb();
if (!req->rq_received) {
if (list_empty(&req->rq_list)) {
......@@ -1191,41 +560,9 @@ xprt_transmit(struct rpc_task *task)
} else if (!req->rq_bytes_sent)
return;
/* Continue transmitting the packet/record. We must be careful
* to cope with writespace callbacks arriving _after_ we have
* called xprt_sendmsg().
*/
while (1) {
req->rq_xtime = jiffies;
status = xprt_sendmsg(xprt, req);
if (status < 0)
break;
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;
goto out_receive;
}
} else {
if (status >= req->rq_slen)
goto out_receive;
status = -EAGAIN;
break;
}
dprintk("RPC: %4d xmit incomplete (%d left of %d)\n",
task->tk_pid, req->rq_slen - req->rq_bytes_sent,
req->rq_slen);
status = -EAGAIN;
if (retry++ > 50)
break;
}
status = xprt->ops->send_request(task);
if (!status)
goto out_receive;
/* Note: at this point, task->tk_sleeping has not yet been set,
* hence there is no danger of the waking up task being put on
......@@ -1234,26 +571,10 @@ xprt_transmit(struct rpc_task *task)
task->tk_status = status;
switch (status) {
case -EAGAIN:
if (test_bit(SOCK_ASYNC_NOSPACE, &xprt->sock->flags)) {
/* Protect against races with xprt_write_space */
spin_lock_bh(&xprt->sock_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->sock_lock);
return;
}
/* Keep holding the socket if it is blocked */
rpc_delay(task, HZ>>4);
return;
case -ECONNREFUSED:
task->tk_timeout = RPC_REESTABLISH_TIMEOUT;
rpc_sleep_on(&xprt->sending, task, NULL, NULL);
case -EAGAIN:
case -ENOTCONN:
return;
default:
......@@ -1367,7 +688,8 @@ xprt_release(struct rpc_task *task)
list_del(&req->rq_list);
xprt->last_used = jiffies;
if (list_empty(&xprt->recv) && !xprt->shutdown)
mod_timer(&xprt->timer, xprt->last_used + XPRT_IDLE_TIMEOUT);
mod_timer(&xprt->timer,
xprt->last_used + RPC_IDLE_DISCONNECT_TIMEOUT);
spin_unlock_bh(&xprt->sock_lock);
task->tk_rqstp = NULL;
memset(req, 0, sizeof(*req)); /* mark unused */
......@@ -1380,18 +702,6 @@ xprt_release(struct rpc_task *task)
spin_unlock(&xprt->xprt_lock);
}
/*
* Set default timeout parameters
*/
static void
xprt_default_timeout(struct rpc_timeout *to, int proto)
{
if (proto == IPPROTO_UDP)
xprt_set_timeout(to, 5, 5 * HZ);
else
xprt_set_timeout(to, 2, 60 * HZ);
}
/*
* Set constant timeout
*/
......@@ -1405,68 +715,51 @@ xprt_set_timeout(struct rpc_timeout *to, unsigned int retr, unsigned long incr)
to->to_exponential = 0;
}
unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
/*
* Initialize an RPC client
*/
static struct rpc_xprt *
xprt_setup(int proto, struct sockaddr_in *ap, struct rpc_timeout *to)
{
int result;
struct rpc_xprt *xprt;
unsigned int entries;
size_t slot_table_size;
struct rpc_rqst *req;
dprintk("RPC: setting up %s transport...\n",
proto == IPPROTO_UDP? "UDP" : "TCP");
entries = (proto == IPPROTO_TCP)?
xprt_tcp_slot_table_entries : xprt_udp_slot_table_entries;
if ((xprt = kmalloc(sizeof(struct rpc_xprt), GFP_KERNEL)) == NULL)
return ERR_PTR(-ENOMEM);
memset(xprt, 0, sizeof(*xprt)); /* Nnnngh! */
xprt->max_reqs = entries;
slot_table_size = entries * sizeof(xprt->slot[0]);
xprt->slot = kmalloc(slot_table_size, GFP_KERNEL);
if (xprt->slot == NULL) {
kfree(xprt);
return ERR_PTR(-ENOMEM);
}
memset(xprt->slot, 0, slot_table_size);
xprt->addr = *ap;
xprt->prot = proto;
xprt->stream = (proto == IPPROTO_TCP)? 1 : 0;
if (xprt->stream) {
xprt->cwnd = RPC_MAXCWND(xprt);
xprt->nocong = 1;
xprt->max_payload = (1U << 31) - 1;
} else {
xprt->cwnd = RPC_INITCWND;
xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
switch (proto) {
case IPPROTO_UDP:
result = xs_setup_udp(xprt, to);
break;
case IPPROTO_TCP:
result = xs_setup_tcp(xprt, to);
break;
default:
printk(KERN_ERR "RPC: unrecognized transport protocol: %d\n",
proto);
result = -EIO;
break;
}
if (result) {
kfree(xprt);
return ERR_PTR(result);
}
spin_lock_init(&xprt->sock_lock);
spin_lock_init(&xprt->xprt_lock);
init_waitqueue_head(&xprt->cong_wait);
INIT_LIST_HEAD(&xprt->free);
INIT_LIST_HEAD(&xprt->recv);
INIT_WORK(&xprt->sock_connect, xprt_socket_connect, xprt);
INIT_WORK(&xprt->task_cleanup, xprt_socket_autoclose, xprt);
init_timer(&xprt->timer);
xprt->timer.function = xprt_init_autodisconnect;
xprt->timer.data = (unsigned long) xprt;
xprt->last_used = jiffies;
xprt->port = XPRT_MAX_RESVPORT;
/* Set timeout parameters */
if (to) {
xprt->timeout = *to;
} else
xprt_default_timeout(&xprt->timeout, xprt->prot);
rpc_init_wait_queue(&xprt->pending, "xprt_pending");
rpc_init_wait_queue(&xprt->sending, "xprt_sending");
......@@ -1474,134 +767,17 @@ xprt_setup(int proto, struct sockaddr_in *ap, struct rpc_timeout *to)
rpc_init_priority_wait_queue(&xprt->backlog, "xprt_backlog");
/* initialize free list */
for (req = &xprt->slot[entries-1]; req >= &xprt->slot[0]; req--)
for (req = &xprt->slot[xprt->max_reqs-1]; req >= &xprt->slot[0]; req--)
list_add(&req->rq_list, &xprt->free);
xprt_init_xid(xprt);
/* Check whether we want to use a reserved port */
xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;
dprintk("RPC: created transport %p with %u slots\n", xprt,
xprt->max_reqs);
return xprt;
}
/*
* Bind to a reserved port
*/
static inline int xprt_bindresvport(struct rpc_xprt *xprt, struct socket *sock)
{
struct sockaddr_in myaddr = {
.sin_family = AF_INET,
};
int err, 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,
sizeof(myaddr));
if (err == 0) {
xprt->port = port;
return 0;
}
if (--port == 0)
port = XPRT_MAX_RESVPORT;
} while (err == -EADDRINUSE && port != xprt->port);
printk("RPC: Can't bind to reserved port (%d).\n", -err);
return err;
}
static void
xprt_bind_socket(struct rpc_xprt *xprt, struct socket *sock)
{
struct sock *sk = sock->sk;
if (xprt->inet)
return;
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_data_ready = udp_data_ready;
sk->sk_no_check = UDP_CSUM_NORCV;
xprt_set_connected(xprt);
} else {
tcp_sk(sk)->nonagle = 1; /* disable Nagle's algorithm */
sk->sk_data_ready = tcp_data_ready;
sk->sk_state_change = tcp_state_change;
xprt_clear_connected(xprt);
}
sk->sk_write_space = xprt_write_space;
/* Reset to new socket */
xprt->sock = sock;
xprt->inet = sk;
write_unlock_bh(&sk->sk_callback_lock);
return;
}
/*
* Set socket buffer length
*/
void
xprt_sock_setbufsize(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;
}
if (xprt->sndsize) {
sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
sk->sk_sndbuf = xprt->sndsize * xprt->max_reqs * 2;
sk->sk_write_space(sk);
}
}
/*
* Datastream sockets are created here, but xprt_connect will create
* and connect stream sockets.
*/
static struct socket * xprt_create_socket(struct rpc_xprt *xprt, int proto, int resvport)
{
struct socket *sock;
int type, err;
dprintk("RPC: xprt_create_socket(%s %d)\n",
(proto == IPPROTO_UDP)? "udp" : "tcp", proto);
type = (proto == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
if ((err = sock_create_kern(PF_INET, type, proto, &sock)) < 0) {
printk("RPC: can't create socket (%d).\n", -err);
return NULL;
}
/* If the caller has the capability, bind to a reserved port */
if (resvport && xprt_bindresvport(xprt, sock) < 0) {
printk("RPC: can't bind to reserved port.\n");
goto failed;
}
return sock;
failed:
sock_release(sock);
return NULL;
}
/*
* Create an RPC client transport given the protocol and peer address.
*/
......@@ -1631,10 +807,6 @@ xprt_shutdown(struct rpc_xprt *xprt)
rpc_wake_up(&xprt->backlog);
wake_up(&xprt->cong_wait);
del_timer_sync(&xprt->timer);
/* synchronously wait for connect worker to finish */
cancel_delayed_work(&xprt->sock_connect);
flush_scheduled_work();
}
/*
......@@ -1655,9 +827,7 @@ xprt_destroy(struct rpc_xprt *xprt)
{
dprintk("RPC: destroying transport %p\n", xprt);
xprt_shutdown(xprt);
xprt_disconnect(xprt);
xprt_close(xprt);
kfree(xprt->slot);
xprt->ops->destroy(xprt);
kfree(xprt);
return 0;
......
net/sunrpc/xprtsock.c 0 → 100644
View file @ a246b010
/*
* linux/net/sunrpc/xprtsock.c
*
* Client-side transport implementation for sockets.
*
* TCP callback races fixes (C) 1998 Red Hat Software <alan@redhat.com>
* TCP send fixes (C) 1998 Red Hat Software <alan@redhat.com>
* TCP NFS related read + write fixes
* (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
*
* 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>
*/
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/capability.h>
#include <linux/sched.h>
#include <linux/pagemap.h>
#include <linux/errno.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/net.h>
#include <linux/mm.h>
#include <linux/udp.h>
#include <linux/tcp.h>
#include <linux/sunrpc/clnt.h>
#include <linux/file.h>
#include <net/sock.h>
#include <net/checksum.h>
#include <net/udp.h>
#include <net/tcp.h>
#ifdef RPC_DEBUG
# undef RPC_DEBUG_DATA
# define RPCDBG_FACILITY RPCDBG_XPRT
#endif
#define XPRT_MAX_RESVPORT (800)
#ifdef RPC_DEBUG_DATA
/*
* Print the buffer contents (first 128 bytes only--just enough for
* diropres return).
*/
static void
xprt_pktdump(char *msg, u32 *packet, unsigned int count)
{
u8 *buf = (u8 *) packet;
int j;
dprintk("RPC: %s\n", msg);
for (j = 0; j < count && j < 128; j += 4) {
if (!(j & 31)) {
if (j)
dprintk("\n");
dprintk("0x%04x ", j);
}
dprintk("%02x%02x%02x%02x ",
buf[j], buf[j+1], buf[j+2], buf[j+3]);
}
dprintk("\n");
}
#else
static inline void
xprt_pktdump(char *msg, u32 *packet, unsigned int count)
{
/* NOP */
}
#endif
/*
* Look up RPC transport given an INET socket
*/
static inline struct rpc_xprt *
xprt_from_sock(struct sock *sk)
{
return (struct rpc_xprt *) sk->sk_user_data;
}
static int
xdr_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen,
struct xdr_buf *xdr, unsigned int base, int msgflags)
{
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);
len = xdr->head[0].iov_len;
if (base < len || (addr != NULL && base == 0)) {
struct kvec iov = {
.iov_base = xdr->head[0].iov_base + base,
.iov_len = len - base,
};
struct msghdr msg = {
.msg_name = addr,
.msg_namelen = addrlen,
.msg_flags = msgflags,
};
if (xdr->len > len)
msg.msg_flags |= MSG_MORE;
if (iov.iov_len != 0)
err = kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
else
err = kernel_sendmsg(sock, &msg, NULL, 0, 0);
if (ret == 0)
ret = err;
else if (err > 0)
ret += err;
if (err != iov.iov_len)
goto out;
base = 0;
} else
base -= len;
if (pglen == 0)
goto copy_tail;
if (base >= pglen) {
base -= pglen;
goto copy_tail;
}
if (base || xdr->page_base) {
pglen -= base;
base += xdr->page_base;
ppage += base >> PAGE_CACHE_SHIFT;
base &= ~PAGE_CACHE_MASK;
}
sendpage = sock->ops->sendpage ? : sock_no_sendpage;
do {
int flags = msgflags;
len = PAGE_CACHE_SIZE;
if (base)
len -= base;
if (pglen < len)
len = pglen;
if (pglen != len || xdr->tail[0].iov_len != 0)
flags |= MSG_MORE;
/* Hmm... We might be dealing with highmem pages */
if (PageHighMem(*ppage))
sendpage = sock_no_sendpage;
err = sendpage(sock, *ppage, base, len, flags);
if (ret == 0)
ret = err;
else if (err > 0)
ret += err;
if (err != len)
goto out;
base = 0;
ppage++;
} while ((pglen -= len) != 0);
copy_tail:
len = xdr->tail[0].iov_len;
if (base < len) {
struct kvec iov = {
.iov_base = xdr->tail[0].iov_base + base,
.iov_len = len - base,
};
struct msghdr msg = {
.msg_flags = msgflags,
};
err = kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
if (ret == 0)
ret = err;
else if (err > 0)
ret += err;
}
out:
return ret;
}
/*
* Write data to socket.
*/
static inline int
xprt_sendmsg(struct rpc_xprt *xprt, struct rpc_rqst *req)
{
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;
if (!sock)
return -ENOTCONN;
xprt_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);
}
/* Dont repeat bytes */
skip = req->rq_bytes_sent;
clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
result = xdr_sendpages(sock, addr, addrlen, xdr, skip, MSG_DONTWAIT);
dprintk("RPC: xprt_sendmsg(%d) = %d\n", xdr->len - skip, result);
if (result >= 0)
return result;
switch (result) {
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;
break;
default:
printk(KERN_NOTICE "RPC: sendmsg returned error %d\n", -result);
}
return result;
}
static int
xprt_send_request(struct rpc_task *task)
{
struct rpc_rqst *req = task->tk_rqstp;
struct rpc_xprt *xprt = req->rq_xprt;
int status, retry = 0;
/* set up everything as needed. */
/* Write the record marker */
if (xprt->stream) {
u32 *marker = req->rq_svec[0].iov_base;
*marker = htonl(0x80000000|(req->rq_slen-sizeof(*marker)));
}
/* Continue transmitting the packet/record. We must be careful
* to cope with writespace callbacks arriving _after_ we have
* called xprt_sendmsg().
*/
while (1) {
req->rq_xtime = jiffies;
status = xprt_sendmsg(xprt, req);
if (status < 0)
break;
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;
break;
}
dprintk("RPC: %4d xmit incomplete (%d left of %d)\n",
task->tk_pid, req->rq_slen - req->rq_bytes_sent,
req->rq_slen);
status = -EAGAIN;
if (retry++ > 50)
break;
}
if (status == -EAGAIN) {
if (test_bit(SOCK_ASYNC_NOSPACE, &xprt->sock->flags)) {
/* Protect against races with xprt_write_space */
spin_lock_bh(&xprt->sock_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->sock_lock);
return status;
}
/* Keep holding the socket if it is blocked */
rpc_delay(task, HZ>>4);
}
return status;
}
/*
* Close down a transport socket
*/
static void
xprt_close(struct rpc_xprt *xprt)
{
struct socket *sock = xprt->sock;
struct sock *sk = xprt->inet;
if (!sk)
return;
write_lock_bh(&sk->sk_callback_lock);
xprt->inet = NULL;
xprt->sock = NULL;
sk->sk_user_data = NULL;
sk->sk_data_ready = xprt->old_data_ready;
sk->sk_state_change = xprt->old_state_change;
sk->sk_write_space = xprt->old_write_space;
write_unlock_bh(&sk->sk_callback_lock);
sk->sk_no_check = 0;
sock_release(sock);
}
static void xprt_socket_destroy(struct rpc_xprt *xprt)
{
cancel_delayed_work(&xprt->sock_connect);
flush_scheduled_work();
xprt_disconnect(xprt);
xprt_close(xprt);
kfree(xprt->slot);
}
/*
* Input handler for RPC replies. Called from a bottom half and hence
* atomic.
*/
static void
udp_data_ready(struct sock *sk, int len)
{
struct rpc_task *task;
struct rpc_xprt *xprt;
struct rpc_rqst *rovr;
struct sk_buff *skb;
int err, repsize, copied;
u32 _xid, *xp;
read_lock(&sk->sk_callback_lock);
dprintk("RPC: udp_data_ready...\n");
if (!(xprt = xprt_from_sock(sk))) {
printk("RPC: udp_data_ready request not found!\n");
goto out;
}
dprintk("RPC: udp_data_ready client %p\n", xprt);
if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
goto out;
if (xprt->shutdown)
goto dropit;
repsize = skb->len - sizeof(struct udphdr);
if (repsize < 4) {
printk("RPC: impossible RPC reply size %d!\n", repsize);
goto dropit;
}
/* Copy the XID from the skb... */
xp = skb_header_pointer(skb, sizeof(struct udphdr),
sizeof(_xid), &_xid);
if (xp == NULL)
goto dropit;
/* Look up and lock the request corresponding to the given XID */
spin_lock(&xprt->sock_lock);
rovr = xprt_lookup_rqst(xprt, *xp);
if (!rovr)
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;
/* Suck it into the iovec, verify checksum if not done by hw. */
if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb))
goto out_unlock;
/* Something worked... */
dst_confirm(skb->dst);
xprt_complete_rqst(xprt, rovr, copied);
out_unlock:
spin_unlock(&xprt->sock_lock);
dropit:
skb_free_datagram(sk, skb);
out:
read_unlock(&sk->sk_callback_lock);
}
/*
* Copy from an skb into memory and shrink the skb.
*/
static inline size_t
tcp_copy_data(skb_reader_t *desc, void *p, size_t len)
{
if (len > desc->count)
len = desc->count;
if (skb_copy_bits(desc->skb, desc->offset, p, len)) {
dprintk("RPC: failed to copy %zu bytes from skb. %zu bytes remain\n",
len, desc->count);
return 0;
}
desc->offset += len;
desc->count -= len;
dprintk("RPC: copied %zu bytes from skb. %zu bytes remain\n",
len, desc->count);
return len;
}
/*
* TCP read fragment marker
*/
static inline void
tcp_read_fraghdr(struct rpc_xprt *xprt, skb_reader_t *desc)
{
size_t len, used;
char *p;
p = ((char *) &xprt->tcp_recm) + xprt->tcp_offset;
len = sizeof(xprt->tcp_recm) - xprt->tcp_offset;
used = tcp_copy_data(desc, p, len);
xprt->tcp_offset += used;
if (used != len)
return;
xprt->tcp_reclen = ntohl(xprt->tcp_recm);
if (xprt->tcp_reclen & 0x80000000)
xprt->tcp_flags |= XPRT_LAST_FRAG;
else
xprt->tcp_flags &= ~XPRT_LAST_FRAG;
xprt->tcp_reclen &= 0x7fffffff;
xprt->tcp_flags &= ~XPRT_COPY_RECM;
xprt->tcp_offset = 0;
/* Sanity check of the record length */
if (xprt->tcp_reclen < 4) {
printk(KERN_ERR "RPC: Invalid TCP record fragment length\n");
xprt_disconnect(xprt);
}
dprintk("RPC: reading TCP record fragment of length %d\n",
xprt->tcp_reclen);
}
static void
tcp_check_recm(struct rpc_xprt *xprt)
{
dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u, tcp_flags = %lx\n",
xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen, xprt->tcp_flags);
if (xprt->tcp_offset == xprt->tcp_reclen) {
xprt->tcp_flags |= XPRT_COPY_RECM;
xprt->tcp_offset = 0;
if (xprt->tcp_flags & XPRT_LAST_FRAG) {
xprt->tcp_flags &= ~XPRT_COPY_DATA;
xprt->tcp_flags |= XPRT_COPY_XID;
xprt->tcp_copied = 0;
}
}
}
/*
* TCP read xid
*/
static inline void
tcp_read_xid(struct rpc_xprt *xprt, skb_reader_t *desc)
{
size_t len, used;
char *p;
len = sizeof(xprt->tcp_xid) - xprt->tcp_offset;
dprintk("RPC: reading XID (%Zu bytes)\n", len);
p = ((char *) &xprt->tcp_xid) + xprt->tcp_offset;
used = tcp_copy_data(desc, p, len);
xprt->tcp_offset += used;
if (used != len)
return;
xprt->tcp_flags &= ~XPRT_COPY_XID;
xprt->tcp_flags |= XPRT_COPY_DATA;
xprt->tcp_copied = 4;
dprintk("RPC: reading reply for XID %08x\n",
ntohl(xprt->tcp_xid));
tcp_check_recm(xprt);
}
/*
* TCP read and complete request
*/
static inline void
tcp_read_request(struct rpc_xprt *xprt, skb_reader_t *desc)
{
struct rpc_rqst *req;
struct xdr_buf *rcvbuf;
size_t len;
ssize_t r;
/* Find and lock the request corresponding to this xid */
spin_lock(&xprt->sock_lock);
req = xprt_lookup_rqst(xprt, xprt->tcp_xid);
if (!req) {
xprt->tcp_flags &= ~XPRT_COPY_DATA;
dprintk("RPC: XID %08x request not found!\n",
ntohl(xprt->tcp_xid));
spin_unlock(&xprt->sock_lock);
return;
}
rcvbuf = &req->rq_private_buf;
len = desc->count;
if (len > xprt->tcp_reclen - xprt->tcp_offset) {
skb_reader_t my_desc;
len = xprt->tcp_reclen - xprt->tcp_offset;
memcpy(&my_desc, desc, sizeof(my_desc));
my_desc.count = len;
r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied,
&my_desc, tcp_copy_data);
desc->count -= r;
desc->offset += r;
} else
r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied,
desc, tcp_copy_data);
if (r > 0) {
xprt->tcp_copied += r;
xprt->tcp_offset += r;
}
if (r != len) {
/* Error when copying to the receive buffer,
* usually because we weren't able to allocate
* additional buffer pages. All we can do now
* is turn off XPRT_COPY_DATA, so the request
* will not receive any additional updates,
* and time out.
* Any remaining data from this record will
* be discarded.
*/
xprt->tcp_flags &= ~XPRT_COPY_DATA;
dprintk("RPC: XID %08x truncated request\n",
ntohl(xprt->tcp_xid));
dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n",
xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen);
goto out;
}
dprintk("RPC: XID %08x read %Zd bytes\n",
ntohl(xprt->tcp_xid), r);
dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n",
xprt, xprt->tcp_copied, xprt->tcp_offset, xprt->tcp_reclen);
if (xprt->tcp_copied == req->rq_private_buf.buflen)
xprt->tcp_flags &= ~XPRT_COPY_DATA;
else if (xprt->tcp_offset == xprt->tcp_reclen) {
if (xprt->tcp_flags & XPRT_LAST_FRAG)
xprt->tcp_flags &= ~XPRT_COPY_DATA;
}
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);
}
spin_unlock(&xprt->sock_lock);
tcp_check_recm(xprt);
}
/*
* TCP discard extra bytes from a short read
*/
static inline void
tcp_read_discard(struct rpc_xprt *xprt, skb_reader_t *desc)
{
size_t len;
len = xprt->tcp_reclen - xprt->tcp_offset;
if (len > desc->count)
len = desc->count;
desc->count -= len;
desc->offset += len;
xprt->tcp_offset += len;
dprintk("RPC: discarded %Zu bytes\n", len);
tcp_check_recm(xprt);
}
/*
* TCP record receive routine
* We first have to grab the record marker, then the XID, then the data.
*/
static int
tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb,
unsigned int offset, size_t len)
{
struct rpc_xprt *xprt = rd_desc->arg.data;
skb_reader_t desc = {
.skb = skb,
.offset = offset,
.count = len,
.csum = 0
};
dprintk("RPC: tcp_data_recv\n");
do {
/* Read in a new fragment marker if necessary */
/* Can we ever really expect to get completely empty fragments? */
if (xprt->tcp_flags & XPRT_COPY_RECM) {
tcp_read_fraghdr(xprt, &desc);
continue;
}
/* Read in the xid if necessary */
if (xprt->tcp_flags & XPRT_COPY_XID) {
tcp_read_xid(xprt, &desc);
continue;
}
/* Read in the request data */
if (xprt->tcp_flags & XPRT_COPY_DATA) {
tcp_read_request(xprt, &desc);
continue;
}
/* Skip over any trailing bytes on short reads */
tcp_read_discard(xprt, &desc);
} while (desc.count);
dprintk("RPC: tcp_data_recv done\n");
return len - desc.count;
}
static void tcp_data_ready(struct sock *sk, int bytes)
{
struct rpc_xprt *xprt;
read_descriptor_t rd_desc;
read_lock(&sk->sk_callback_lock);
dprintk("RPC: tcp_data_ready...\n");
if (!(xprt = xprt_from_sock(sk))) {
printk("RPC: tcp_data_ready socket info not found!\n");
goto out;
}
if (xprt->shutdown)
goto out;
/* We use rd_desc to pass struct xprt to tcp_data_recv */
rd_desc.arg.data = xprt;
rd_desc.count = 65536;
tcp_read_sock(sk, &rd_desc, tcp_data_recv);
out:
read_unlock(&sk->sk_callback_lock);
}
static void
tcp_state_change(struct sock *sk)
{
struct rpc_xprt *xprt;
read_lock(&sk->sk_callback_lock);
if (!(xprt = xprt_from_sock(sk)))
goto out;
dprintk("RPC: tcp_state_change client %p...\n", xprt);
dprintk("RPC: state %x conn %d dead %d zapped %d\n",
sk->sk_state, xprt_connected(xprt),
sock_flag(sk, SOCK_DEAD),
sock_flag(sk, SOCK_ZAPPED));
switch (sk->sk_state) {
case TCP_ESTABLISHED:
spin_lock_bh(&xprt->sock_lock);
if (!xprt_test_and_set_connected(xprt)) {
/* Reset TCP record info */
xprt->tcp_offset = 0;
xprt->tcp_reclen = 0;
xprt->tcp_copied = 0;
xprt->tcp_flags = XPRT_COPY_RECM | XPRT_COPY_XID;
rpc_wake_up(&xprt->pending);
}
spin_unlock_bh(&xprt->sock_lock);
break;
case TCP_SYN_SENT:
case TCP_SYN_RECV:
break;
default:
xprt_disconnect(xprt);
break;
}
out:
read_unlock(&sk->sk_callback_lock);
}
/*
* 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
* with a bunch of small requests.
*/
static void
xprt_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))
goto out;
} else {
/* from net/core/sock.c:sock_def_write_space */
if (!sock_writeable(sk))
goto out;
}
if (!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))
goto out;
spin_lock_bh(&xprt->sock_lock);
if (xprt->snd_task)
rpc_wake_up_task(xprt->snd_task);
spin_unlock_bh(&xprt->sock_lock);
out:
read_unlock(&sk->sk_callback_lock);
}
/*
* Set socket buffer length
*/
static void
xprt_sock_setbufsize(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;
}
if (xprt->sndsize) {
sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
sk->sk_sndbuf = xprt->sndsize * xprt->max_reqs * 2;
sk->sk_write_space(sk);
}
}
/*
* Bind to a reserved port
*/
static inline int xprt_bindresvport(struct rpc_xprt *xprt, struct socket *sock)
{
struct sockaddr_in myaddr = {
.sin_family = AF_INET,
};
int err, 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,
sizeof(myaddr));
if (err == 0) {
xprt->port = port;
return 0;
}
if (--port == 0)
port = XPRT_MAX_RESVPORT;
} while (err == -EADDRINUSE && port != xprt->port);
printk("RPC: Can't bind to reserved port (%d).\n", -err);
return err;
}
static void
xprt_bind_socket(struct rpc_xprt *xprt, struct socket *sock)
{
struct sock *sk = sock->sk;
if (xprt->inet)
return;
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_data_ready = udp_data_ready;
sk->sk_no_check = UDP_CSUM_NORCV;
xprt_set_connected(xprt);
} else {
tcp_sk(sk)->nonagle = 1; /* disable Nagle's algorithm */
sk->sk_data_ready = tcp_data_ready;
sk->sk_state_change = tcp_state_change;
xprt_clear_connected(xprt);
}
sk->sk_write_space = xprt_write_space;
/* Reset to new socket */
xprt->sock = sock;
xprt->inet = sk;
write_unlock_bh(&sk->sk_callback_lock);
return;
}
/*
* Datastream sockets are created here, but xprt_connect will create
* and connect stream sockets.
*/
static struct socket * xprt_create_socket(struct rpc_xprt *xprt, int proto, int resvport)
{
struct socket *sock;
int type, err;
dprintk("RPC: xprt_create_socket(%s %d)\n",
(proto == IPPROTO_UDP)? "udp" : "tcp", proto);
type = (proto == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM;
if ((err = sock_create_kern(PF_INET, type, proto, &sock)) < 0) {
printk("RPC: can't create socket (%d).\n", -err);
return NULL;
}
/* If the caller has the capability, bind to a reserved port */
if (resvport && xprt_bindresvport(xprt, sock) < 0) {
printk("RPC: can't bind to reserved port.\n");
goto failed;
}
return sock;
failed:
sock_release(sock);
return NULL;
}
static void xprt_socket_connect(void *args)
{
struct rpc_xprt *xprt = (struct rpc_xprt *)args;
struct socket *sock = xprt->sock;
int status = -EIO;
if (xprt->shutdown || xprt->addr.sin_port == 0)
goto out;
/*
* Start by resetting any existing state
*/
xprt_close(xprt);
sock = xprt_create_socket(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;
}
xprt_bind_socket(xprt, sock);
xprt_sock_setbufsize(xprt);
status = 0;
if (!xprt->stream)
goto out;
/*
* 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",
xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
if (status < 0) {
switch (status) {
case -EINPROGRESS:
case -EALREADY:
goto out_clear;
}
}
out:
if (status < 0)
rpc_wake_up_status(&xprt->pending, status);
else
rpc_wake_up(&xprt->pending);
out_clear:
smp_mb__before_clear_bit();
clear_bit(XPRT_CONNECTING, &xprt->sockstate);
smp_mb__after_clear_bit();
}
static void
xprt_connect_sock(struct rpc_task *task)
{
struct rpc_xprt *xprt = task->tk_xprt;
if (!test_and_set_bit(XPRT_CONNECTING, &xprt->sockstate)) {
/* Note: if we are here due to a dropped connection
* we delay reconnecting by RPC_REESTABLISH_TIMEOUT/HZ
* seconds
*/
if (xprt->sock != NULL)
schedule_delayed_work(&xprt->sock_connect,
RPC_REESTABLISH_TIMEOUT);
else {
schedule_work(&xprt->sock_connect);
/* flush_scheduled_work can sleep... */
if (!RPC_IS_ASYNC(task))
flush_scheduled_work();
}
}
}
/*
* Set default timeout parameters
*/
static void
xprt_default_timeout(struct rpc_timeout *to, int proto)
{
if (proto == IPPROTO_UDP)
xprt_set_timeout(to, 5, 5 * HZ);
else
xprt_set_timeout(to, 2, 60 * HZ);
}
static struct rpc_xprt_ops xprt_socket_ops = {
.set_buffer_size = xprt_sock_setbufsize,
.connect = xprt_connect_sock,
.send_request = xprt_send_request,
.close = xprt_close,
.destroy = xprt_socket_destroy,
};
extern unsigned int xprt_udp_slot_table_entries;
extern unsigned int xprt_tcp_slot_table_entries;
int xs_setup_udp(struct rpc_xprt *xprt, struct rpc_timeout *to)
{
size_t slot_table_size;
dprintk("RPC: setting up udp-ipv4 transport...\n");
xprt->max_reqs = xprt_udp_slot_table_entries;
slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]);
xprt->slot = kmalloc(slot_table_size, GFP_KERNEL);
if (xprt->slot == NULL)
return -ENOMEM;
memset(xprt->slot, 0, slot_table_size);
xprt->prot = IPPROTO_UDP;
xprt->port = XPRT_MAX_RESVPORT;
xprt->stream = 0;
xprt->nocong = 0;
xprt->cwnd = RPC_INITCWND;
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, xprt_socket_connect, xprt);
xprt->ops = &xprt_socket_ops;
if (to)
xprt->timeout = *to;
else
xprt_default_timeout(to, xprt->prot);
return 0;
}
int xs_setup_tcp(struct rpc_xprt *xprt, struct rpc_timeout *to)
{
size_t slot_table_size;
dprintk("RPC: setting up tcp-ipv4 transport...\n");
xprt->max_reqs = xprt_tcp_slot_table_entries;
slot_table_size = xprt->max_reqs * sizeof(xprt->slot[0]);
xprt->slot = kmalloc(slot_table_size, GFP_KERNEL);
if (xprt->slot == NULL)
return -ENOMEM;
memset(xprt->slot, 0, slot_table_size);
xprt->prot = IPPROTO_TCP;
xprt->port = XPRT_MAX_RESVPORT;
xprt->stream = 1;
xprt->nocong = 1;
xprt->cwnd = RPC_MAXCWND(xprt);
xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;
xprt->max_payload = (1U << 31) - 1;
INIT_WORK(&xprt->sock_connect, xprt_socket_connect, xprt);
xprt->ops = &xprt_socket_ops;
if (to)
xprt->timeout = *to;
else
xprt_default_timeout(to, xprt->prot);
return 0;
}
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