![Chuck Lever](/assets/img/avatar_default.png)
A new interface that allows transports to adjust their congestion window using the Van Jacobson implementation in xprt.c is provided. Test-plan: Use WAN simulation to cause sporadic bursty packet loss. Look for significant regression in performance or client stability. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
1158 lines
29 KiB
C
1158 lines
29 KiB
C
/*
|
|
* 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>
|
|
*
|
|
* IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
|
|
*/
|
|
|
|
#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>
|
|
|
|
/*
|
|
* Maximum port number to use when requesting a reserved port.
|
|
*/
|
|
#define XS_MAX_RESVPORT (800U)
|
|
|
|
/*
|
|
* How many times to try sending a request on a socket before waiting
|
|
* for the socket buffer to clear.
|
|
*/
|
|
#define XS_SENDMSG_RETRY (10U)
|
|
|
|
#ifdef RPC_DEBUG
|
|
# undef RPC_DEBUG_DATA
|
|
# define RPCDBG_FACILITY RPCDBG_TRANS
|
|
#endif
|
|
|
|
#ifdef RPC_DEBUG_DATA
|
|
static void xs_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 xs_pktdump(char *msg, u32 *packet, unsigned int count)
|
|
{
|
|
/* NOP */
|
|
}
|
|
#endif
|
|
|
|
#define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
|
|
|
|
static inline int xs_send_head(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, unsigned int len)
|
|
{
|
|
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 = XS_SENDMSG_FLAGS,
|
|
};
|
|
|
|
if (xdr->len > len)
|
|
msg.msg_flags |= MSG_MORE;
|
|
|
|
if (likely(iov.iov_len))
|
|
return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
|
|
return kernel_sendmsg(sock, &msg, NULL, 0, 0);
|
|
}
|
|
|
|
static int xs_send_tail(struct socket *sock, struct xdr_buf *xdr, unsigned int base, unsigned int len)
|
|
{
|
|
struct kvec iov = {
|
|
.iov_base = xdr->tail[0].iov_base + base,
|
|
.iov_len = len - base,
|
|
};
|
|
struct msghdr msg = {
|
|
.msg_flags = XS_SENDMSG_FLAGS,
|
|
};
|
|
|
|
return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
|
|
}
|
|
|
|
/**
|
|
* xs_sendpages - write pages directly to a socket
|
|
* @sock: socket to send on
|
|
* @addr: UDP only -- address of destination
|
|
* @addrlen: UDP only -- length of destination address
|
|
* @xdr: buffer containing this request
|
|
* @base: starting position in the buffer
|
|
*
|
|
*/
|
|
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);
|
|
if (ret == 0)
|
|
ret = err;
|
|
else if (err > 0)
|
|
ret += err;
|
|
if (err != (len - base))
|
|
goto out;
|
|
base = 0;
|
|
} else
|
|
base -= len;
|
|
|
|
if (unlikely(pglen == 0))
|
|
goto copy_tail;
|
|
if (unlikely(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 = XS_SENDMSG_FLAGS;
|
|
|
|
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) {
|
|
err = xs_send_tail(sock, xdr, base, len);
|
|
if (ret == 0)
|
|
ret = err;
|
|
else if (err > 0)
|
|
ret += err;
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* xs_nospace - place task on wait queue if transmit was incomplete
|
|
* @task: task to put to sleep
|
|
*
|
|
*/
|
|
static void xs_nospace(struct rpc_task *task)
|
|
{
|
|
struct rpc_rqst *req = task->tk_rqstp;
|
|
struct rpc_xprt *xprt = req->rq_xprt;
|
|
|
|
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);
|
|
|
|
req->rq_xtime = jiffies;
|
|
status = xs_sendpages(xprt->sock, (struct sockaddr *) &xprt->addr,
|
|
sizeof(xprt->addr), xdr, req->rq_bytes_sent);
|
|
|
|
dprintk("RPC: xs_udp_send_request(%u) = %d\n",
|
|
xdr->len - req->rq_bytes_sent, status);
|
|
|
|
if (likely(status >= (int) req->rq_slen))
|
|
return 0;
|
|
|
|
/* Still some bytes left; set up for a retry later. */
|
|
if (status > 0)
|
|
status = -EAGAIN;
|
|
|
|
switch (status) {
|
|
case -ENETUNREACH:
|
|
case -EPIPE:
|
|
case -ECONNREFUSED:
|
|
/* When the server has died, an ICMP port unreachable message
|
|
* prompts ECONNREFUSED. */
|
|
break;
|
|
case -EAGAIN:
|
|
xs_nospace(task);
|
|
break;
|
|
default:
|
|
dprintk("RPC: sendmsg returned unrecognized error %d\n",
|
|
-status);
|
|
break;
|
|
}
|
|
|
|
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_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
|
|
* 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 sendmsg is not able to make progress?
|
|
*/
|
|
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;
|
|
|
|
xs_encode_tcp_record_marker(&req->rq_snd_buf);
|
|
|
|
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(). */
|
|
while (1) {
|
|
req->rq_xtime = jiffies;
|
|
status = xs_sendpages(xprt->sock, NULL, 0, xdr,
|
|
req->rq_bytes_sent);
|
|
|
|
dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
|
|
xdr->len - req->rq_bytes_sent, status);
|
|
|
|
if (unlikely(status < 0))
|
|
break;
|
|
|
|
/* 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++ > XS_SENDMSG_RETRY)
|
|
break;
|
|
}
|
|
|
|
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
|
|
*
|
|
*/
|
|
static void xs_close(struct rpc_xprt *xprt)
|
|
{
|
|
struct socket *sock = xprt->sock;
|
|
struct sock *sk = xprt->inet;
|
|
|
|
if (!sk)
|
|
return;
|
|
|
|
dprintk("RPC: xs_close xprt %p\n", xprt);
|
|
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* xs_destroy - prepare to shutdown a transport
|
|
* @xprt: doomed transport
|
|
*
|
|
*/
|
|
static void xs_destroy(struct rpc_xprt *xprt)
|
|
{
|
|
dprintk("RPC: xs_destroy xprt %p\n", xprt);
|
|
|
|
cancel_delayed_work(&xprt->connect_worker);
|
|
flush_scheduled_work();
|
|
|
|
xprt_disconnect(xprt);
|
|
xs_close(xprt);
|
|
kfree(xprt->slot);
|
|
}
|
|
|
|
static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
|
|
{
|
|
return (struct rpc_xprt *) sk->sk_user_data;
|
|
}
|
|
|
|
/**
|
|
* xs_udp_data_ready - "data ready" callback for UDP sockets
|
|
* @sk: socket with data to read
|
|
* @len: how much data to read
|
|
*
|
|
*/
|
|
static void xs_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: xs_udp_data_ready...\n");
|
|
if (!(xprt = xprt_from_sock(sk)))
|
|
goto out;
|
|
|
|
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) {
|
|
dprintk("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->transport_lock);
|
|
rovr = xprt_lookup_rqst(xprt, *xp);
|
|
if (!rovr)
|
|
goto out_unlock;
|
|
task = rovr->rq_task;
|
|
|
|
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_adjust_cwnd(task, copied);
|
|
xprt_update_rtt(task);
|
|
xprt_complete_rqst(task, copied);
|
|
|
|
out_unlock:
|
|
spin_unlock(&xprt->transport_lock);
|
|
dropit:
|
|
skb_free_datagram(sk, skb);
|
|
out:
|
|
read_unlock(&sk->sk_callback_lock);
|
|
}
|
|
|
|
static inline size_t xs_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;
|
|
}
|
|
|
|
static inline void xs_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 = xs_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 & RPC_LAST_STREAM_FRAGMENT)
|
|
xprt->tcp_flags |= XPRT_LAST_FRAG;
|
|
else
|
|
xprt->tcp_flags &= ~XPRT_LAST_FRAG;
|
|
xprt->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
|
|
|
|
xprt->tcp_flags &= ~XPRT_COPY_RECM;
|
|
xprt->tcp_offset = 0;
|
|
|
|
/* Sanity check of the record length */
|
|
if (unlikely(xprt->tcp_reclen < 4)) {
|
|
dprintk("RPC: invalid TCP record fragment length\n");
|
|
xprt_disconnect(xprt);
|
|
return;
|
|
}
|
|
dprintk("RPC: reading TCP record fragment of length %d\n",
|
|
xprt->tcp_reclen);
|
|
}
|
|
|
|
static void xs_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;
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline void xs_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 = xs_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));
|
|
xs_tcp_check_recm(xprt);
|
|
}
|
|
|
|
static inline void xs_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->transport_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->transport_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, xs_tcp_copy_data);
|
|
desc->count -= r;
|
|
desc->offset += r;
|
|
} else
|
|
r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied,
|
|
desc, xs_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))
|
|
xprt_complete_rqst(req->rq_task, xprt->tcp_copied);
|
|
spin_unlock(&xprt->transport_lock);
|
|
xs_tcp_check_recm(xprt);
|
|
}
|
|
|
|
static inline void xs_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);
|
|
xs_tcp_check_recm(xprt);
|
|
}
|
|
|
|
static int xs_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: xs_tcp_data_recv started\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) {
|
|
xs_tcp_read_fraghdr(xprt, &desc);
|
|
continue;
|
|
}
|
|
/* Read in the xid if necessary */
|
|
if (xprt->tcp_flags & XPRT_COPY_XID) {
|
|
xs_tcp_read_xid(xprt, &desc);
|
|
continue;
|
|
}
|
|
/* Read in the request data */
|
|
if (xprt->tcp_flags & XPRT_COPY_DATA) {
|
|
xs_tcp_read_request(xprt, &desc);
|
|
continue;
|
|
}
|
|
/* Skip over any trailing bytes on short reads */
|
|
xs_tcp_read_discard(xprt, &desc);
|
|
} while (desc.count);
|
|
dprintk("RPC: xs_tcp_data_recv done\n");
|
|
return len - desc.count;
|
|
}
|
|
|
|
/**
|
|
* xs_tcp_data_ready - "data ready" callback for TCP sockets
|
|
* @sk: socket with data to read
|
|
* @bytes: how much data to read
|
|
*
|
|
*/
|
|
static void xs_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: xs_tcp_data_ready...\n");
|
|
if (!(xprt = xprt_from_sock(sk)))
|
|
goto out;
|
|
if (xprt->shutdown)
|
|
goto out;
|
|
|
|
/* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
|
|
rd_desc.arg.data = xprt;
|
|
rd_desc.count = 65536;
|
|
tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
|
|
out:
|
|
read_unlock(&sk->sk_callback_lock);
|
|
}
|
|
|
|
/**
|
|
* xs_tcp_state_change - callback to handle TCP socket state changes
|
|
* @sk: socket whose state has changed
|
|
*
|
|
*/
|
|
static void xs_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: xs_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->transport_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;
|
|
xprt_wake_pending_tasks(xprt, 0);
|
|
}
|
|
spin_unlock_bh(&xprt->transport_lock);
|
|
break;
|
|
case TCP_SYN_SENT:
|
|
case TCP_SYN_RECV:
|
|
break;
|
|
default:
|
|
xprt_disconnect(xprt);
|
|
break;
|
|
}
|
|
out:
|
|
read_unlock(&sk->sk_callback_lock);
|
|
}
|
|
|
|
/**
|
|
* 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 kernel_sendmsg
|
|
* with a bunch of small requests.
|
|
*/
|
|
static void xs_udp_write_space(struct sock *sk)
|
|
{
|
|
read_lock(&sk->sk_callback_lock);
|
|
|
|
/* 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;
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* xs_tcp_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 kernel_sendmsg
|
|
* with a bunch of small requests.
|
|
*/
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* xs_udp_set_buffer_size - set send and receive limits
|
|
* @xprt: generic transport
|
|
*
|
|
* Set socket send and receive limits based on the
|
|
* sndsize and rcvsize fields in the generic transport
|
|
* structure.
|
|
*/
|
|
static void xs_udp_set_buffer_size(struct rpc_xprt *xprt)
|
|
{
|
|
struct sock *sk = xprt->inet;
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* xs_tcp_set_buffer_size - set send and receive limits
|
|
* @xprt: generic transport
|
|
*
|
|
* Nothing to do for TCP.
|
|
*/
|
|
static void xs_tcp_set_buffer_size(struct rpc_xprt *xprt)
|
|
{
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
|
|
static int xs_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;
|
|
dprintk("RPC: xs_bindresvport bound to port %u\n",
|
|
port);
|
|
return 0;
|
|
}
|
|
if (--port == 0)
|
|
port = XS_MAX_RESVPORT;
|
|
} while (err == -EADDRINUSE && port != xprt->port);
|
|
|
|
dprintk("RPC: can't bind to reserved port (%d).\n", -err);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* 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 rpc_xprt *xprt = (struct rpc_xprt *) args;
|
|
struct socket *sock = xprt->sock;
|
|
int err, status = -EIO;
|
|
|
|
if (xprt->shutdown || xprt->addr.sin_port == 0)
|
|
goto out;
|
|
|
|
dprintk("RPC: xs_udp_connect_worker for xprt %p\n", xprt);
|
|
|
|
/* Start by resetting any existing state */
|
|
xs_close(xprt);
|
|
|
|
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;
|
|
}
|
|
|
|
if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) {
|
|
sock_release(sock);
|
|
goto out;
|
|
}
|
|
|
|
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_udp_data_ready;
|
|
sk->sk_write_space = xs_udp_write_space;
|
|
sk->sk_no_check = UDP_CSUM_NORCV;
|
|
|
|
xprt_set_connected(xprt);
|
|
|
|
/* Reset to new socket */
|
|
xprt->sock = sock;
|
|
xprt->inet = sk;
|
|
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
}
|
|
xs_udp_set_buffer_size(xprt);
|
|
status = 0;
|
|
out:
|
|
xprt_wake_pending_tasks(xprt, status);
|
|
xprt_clear_connecting(xprt);
|
|
}
|
|
|
|
/**
|
|
* 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_tcp_connect_worker(void *args)
|
|
{
|
|
struct rpc_xprt *xprt = (struct rpc_xprt *)args;
|
|
struct socket *sock = xprt->sock;
|
|
int err, status = -EIO;
|
|
|
|
if (xprt->shutdown || xprt->addr.sin_port == 0)
|
|
goto out;
|
|
|
|
dprintk("RPC: xs_tcp_connect_worker for xprt %p\n", xprt);
|
|
|
|
/* Start by resetting any existing socket state */
|
|
xs_close(xprt);
|
|
|
|
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;
|
|
}
|
|
|
|
if (xprt->resvport && xs_bindresvport(xprt, sock) < 0) {
|
|
sock_release(sock);
|
|
goto out;
|
|
}
|
|
|
|
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;
|
|
tcp_sk(sk)->nonagle = 1;
|
|
|
|
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",
|
|
xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
|
|
if (status < 0) {
|
|
switch (status) {
|
|
case -EINPROGRESS:
|
|
case -EALREADY:
|
|
goto out_clear;
|
|
}
|
|
}
|
|
out:
|
|
xprt_wake_pending_tasks(xprt, status);
|
|
out_clear:
|
|
xprt_clear_connecting(xprt);
|
|
}
|
|
|
|
/**
|
|
* xs_connect - connect a socket to a remote endpoint
|
|
* @task: address of RPC task that manages state of connect request
|
|
*
|
|
* TCP: If the remote end dropped the connection, delay reconnecting.
|
|
*/
|
|
static void xs_connect(struct rpc_task *task)
|
|
{
|
|
struct rpc_xprt *xprt = task->tk_xprt;
|
|
|
|
if (xprt_test_and_set_connecting(xprt))
|
|
return;
|
|
|
|
if (xprt->sock != NULL) {
|
|
dprintk("RPC: xs_connect delayed xprt %p\n", xprt);
|
|
schedule_delayed_work(&xprt->connect_worker,
|
|
RPC_REESTABLISH_TIMEOUT);
|
|
} 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_udp_ops = {
|
|
.set_buffer_size = xs_udp_set_buffer_size,
|
|
.reserve_xprt = xprt_reserve_xprt_cong,
|
|
.release_xprt = xprt_release_xprt_cong,
|
|
.connect = xs_connect,
|
|
.send_request = xs_udp_send_request,
|
|
.set_retrans_timeout = xprt_set_retrans_timeout_rtt,
|
|
.timer = xs_udp_timer,
|
|
.close = xs_close,
|
|
.destroy = xs_destroy,
|
|
};
|
|
|
|
static struct rpc_xprt_ops xs_tcp_ops = {
|
|
.set_buffer_size = xs_tcp_set_buffer_size,
|
|
.reserve_xprt = xprt_reserve_xprt,
|
|
.release_xprt = xprt_release_xprt,
|
|
.connect = xs_connect,
|
|
.send_request = xs_tcp_send_request,
|
|
.set_retrans_timeout = xprt_set_retrans_timeout_def,
|
|
.close = xs_close,
|
|
.destroy = xs_destroy,
|
|
};
|
|
|
|
extern unsigned int xprt_udp_slot_table_entries;
|
|
extern unsigned int xprt_tcp_slot_table_entries;
|
|
|
|
/**
|
|
* xs_setup_udp - Set up transport to use a UDP socket
|
|
* @xprt: transport to set up
|
|
* @to: timeout parameters
|
|
*
|
|
*/
|
|
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 = XS_MAX_RESVPORT;
|
|
xprt->tsh_size = 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->connect_worker, xs_udp_connect_worker, xprt);
|
|
|
|
xprt->ops = &xs_udp_ops;
|
|
|
|
if (to)
|
|
xprt->timeout = *to;
|
|
else
|
|
xprt_set_timeout(&xprt->timeout, 5, 5 * HZ);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* xs_setup_tcp - Set up transport to use a TCP socket
|
|
* @xprt: transport to set up
|
|
* @to: timeout parameters
|
|
*
|
|
*/
|
|
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 = XS_MAX_RESVPORT;
|
|
xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
|
|
xprt->nocong = 1;
|
|
xprt->cwnd = RPC_MAXCWND(xprt);
|
|
xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;
|
|
xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
|
|
|
|
INIT_WORK(&xprt->connect_worker, xs_tcp_connect_worker, xprt);
|
|
|
|
xprt->ops = &xs_tcp_ops;
|
|
|
|
if (to)
|
|
xprt->timeout = *to;
|
|
else
|
|
xprt_set_timeout(&xprt->timeout, 2, 60 * HZ);
|
|
|
|
return 0;
|
|
}
|