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SUNRPC: Move TCP receive state variables into private data structure

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Move the TCP receive state variables from the generic rpc_xprt structure to
a private structure maintained inside net/sunrpc/xprtsock.c.

Also rename a function/variable pair to refer to RPC fragment headers
instead of record markers, to be consistent with types defined in
sunrpc/*.h.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2006-12-05 16:35:19 -05:00 committed by Trond Myklebust
parent ee0ac0c227
commit 51971139b2
2 changed files with 85 additions and 76 deletions
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9
include/linux/sunrpc/xprt.h
View file

@ -157,15 +157,6 @@ struct rpc_xprt {
unsigned char shutdown : 1, /* being shut down */
resvport : 1; /* use a reserved port */
/*
* State of TCP reply receive stuff
*/
__be32 tcp_recm, /* Fragment header */
tcp_xid; /* Current XID */
u32 tcp_reclen, /* fragment length */
tcp_offset; /* fragment offset */
unsigned long tcp_copied, /* copied to request */
tcp_flags;
/*
* Connection of transports
*/

152
net/sunrpc/xprtsock.c
View file

@ -133,6 +133,18 @@ struct sock_xprt {
*/
struct socket * sock;
struct sock * inet;
/*
* State of TCP reply receive
*/
__be32 tcp_fraghdr,
tcp_xid;
u32 tcp_offset,
tcp_reclen;
unsigned long tcp_copied,
tcp_flags;
};
static void xs_format_peer_addresses(struct rpc_xprt *xprt)
@ -628,73 +640,73 @@ static inline size_t xs_tcp_copy_data(skb_reader_t *desc, void *p, size_t len)
static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, skb_reader_t *desc)
{
struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
size_t len, used;
char *p;
p = ((char *) &xprt->tcp_recm) + xprt->tcp_offset;
len = sizeof(xprt->tcp_recm) - xprt->tcp_offset;
p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
used = xs_tcp_copy_data(desc, p, len);
xprt->tcp_offset += used;
transport->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;
transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
transport->tcp_flags |= XPRT_LAST_FRAG;
else
xprt->tcp_flags &= ~XPRT_LAST_FRAG;
xprt->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
transport->tcp_flags &= ~XPRT_LAST_FRAG;
transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
xprt->tcp_flags &= ~XPRT_COPY_RECM;
xprt->tcp_offset = 0;
transport->tcp_flags &= ~XPRT_COPY_RECM;
transport->tcp_offset = 0;
/* Sanity check of the record length */
if (unlikely(xprt->tcp_reclen < 4)) {
if (unlikely(transport->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);
transport->tcp_reclen);
}
static void xs_tcp_check_recm(struct rpc_xprt *xprt)
static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
{
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;
if (transport->tcp_offset == transport->tcp_reclen) {
transport->tcp_flags |= XPRT_COPY_RECM;
transport->tcp_offset = 0;
if (transport->tcp_flags & XPRT_LAST_FRAG) {
transport->tcp_flags &= ~XPRT_COPY_DATA;
transport->tcp_flags |= XPRT_COPY_XID;
transport->tcp_copied = 0;
}
}
}
static inline void xs_tcp_read_xid(struct rpc_xprt *xprt, skb_reader_t *desc)
static inline void xs_tcp_read_xid(struct sock_xprt *transport, skb_reader_t *desc)
{
size_t len, used;
char *p;
len = sizeof(xprt->tcp_xid) - xprt->tcp_offset;
len = sizeof(transport->tcp_xid) - transport->tcp_offset;
dprintk("RPC: reading XID (%Zu bytes)\n", len);
p = ((char *) &xprt->tcp_xid) + xprt->tcp_offset;
p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
used = xs_tcp_copy_data(desc, p, len);
xprt->tcp_offset += used;
transport->tcp_offset += used;
if (used != len)
return;
xprt->tcp_flags &= ~XPRT_COPY_XID;
xprt->tcp_flags |= XPRT_COPY_DATA;
xprt->tcp_copied = 4;
transport->tcp_flags &= ~XPRT_COPY_XID;
transport->tcp_flags |= XPRT_COPY_DATA;
transport->tcp_copied = 4;
dprintk("RPC: reading reply for XID %08x\n",
ntohl(xprt->tcp_xid));
xs_tcp_check_recm(xprt);
ntohl(transport->tcp_xid));
xs_tcp_check_fraghdr(transport);
}
static inline void xs_tcp_read_request(struct rpc_xprt *xprt, skb_reader_t *desc)
{
struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
struct rpc_rqst *req;
struct xdr_buf *rcvbuf;
size_t len;
@ -702,34 +714,34 @@ static inline void xs_tcp_read_request(struct rpc_xprt *xprt, skb_reader_t *desc
/* Find and lock the request corresponding to this xid */
spin_lock(&xprt->transport_lock);
req = xprt_lookup_rqst(xprt, xprt->tcp_xid);
req = xprt_lookup_rqst(xprt, transport->tcp_xid);
if (!req) {
xprt->tcp_flags &= ~XPRT_COPY_DATA;
transport->tcp_flags &= ~XPRT_COPY_DATA;
dprintk("RPC: XID %08x request not found!\n",
ntohl(xprt->tcp_xid));
ntohl(transport->tcp_xid));
spin_unlock(&xprt->transport_lock);
return;
}
rcvbuf = &req->rq_private_buf;
len = desc->count;
if (len > xprt->tcp_reclen - xprt->tcp_offset) {
if (len > transport->tcp_reclen - transport->tcp_offset) {
skb_reader_t my_desc;
len = xprt->tcp_reclen - xprt->tcp_offset;
len = transport->tcp_reclen - transport->tcp_offset;
memcpy(&my_desc, desc, sizeof(my_desc));
my_desc.count = len;
r = xdr_partial_copy_from_skb(rcvbuf, xprt->tcp_copied,
r = xdr_partial_copy_from_skb(rcvbuf, transport->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,
r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
desc, xs_tcp_copy_data);
if (r > 0) {
xprt->tcp_copied += r;
xprt->tcp_offset += r;
transport->tcp_copied += r;
transport->tcp_offset += r;
}
if (r != len) {
/* Error when copying to the receive buffer,
@ -741,77 +753,79 @@ static inline void xs_tcp_read_request(struct rpc_xprt *xprt, skb_reader_t *desc
* Any remaining data from this record will
* be discarded.
*/
xprt->tcp_flags &= ~XPRT_COPY_DATA;
transport->tcp_flags &= ~XPRT_COPY_DATA;
dprintk("RPC: XID %08x truncated request\n",
ntohl(xprt->tcp_xid));
ntohl(transport->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);
xprt, transport->tcp_copied, transport->tcp_offset,
transport->tcp_reclen);
goto out;
}
dprintk("RPC: XID %08x read %Zd bytes\n",
ntohl(xprt->tcp_xid), r);
ntohl(transport->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);
xprt, transport->tcp_copied, transport->tcp_offset,
transport->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;
if (transport->tcp_copied == req->rq_private_buf.buflen)
transport->tcp_flags &= ~XPRT_COPY_DATA;
else if (transport->tcp_offset == transport->tcp_reclen) {
if (transport->tcp_flags & XPRT_LAST_FRAG)
transport->tcp_flags &= ~XPRT_COPY_DATA;
}
out:
if (!(xprt->tcp_flags & XPRT_COPY_DATA))
xprt_complete_rqst(req->rq_task, xprt->tcp_copied);
if (!(transport->tcp_flags & XPRT_COPY_DATA))
xprt_complete_rqst(req->rq_task, transport->tcp_copied);
spin_unlock(&xprt->transport_lock);
xs_tcp_check_recm(xprt);
xs_tcp_check_fraghdr(transport);
}
static inline void xs_tcp_read_discard(struct rpc_xprt *xprt, skb_reader_t *desc)
static inline void xs_tcp_read_discard(struct sock_xprt *transport, skb_reader_t *desc)
{
size_t len;
len = xprt->tcp_reclen - xprt->tcp_offset;
len = transport->tcp_reclen - transport->tcp_offset;
if (len > desc->count)
len = desc->count;
desc->count -= len;
desc->offset += len;
xprt->tcp_offset += len;
transport->tcp_offset += len;
dprintk("RPC: discarded %Zu bytes\n", len);
xs_tcp_check_recm(xprt);
xs_tcp_check_fraghdr(transport);
}
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;
struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
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) {
if (transport->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);
if (transport->tcp_flags & XPRT_COPY_XID) {
xs_tcp_read_xid(transport, &desc);
continue;
}
/* Read in the request data */
if (xprt->tcp_flags & XPRT_COPY_DATA) {
if (transport->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);
xs_tcp_read_discard(transport, &desc);
} while (desc.count);
dprintk("RPC: xs_tcp_data_recv done\n");
return len - desc.count;
@ -865,11 +879,15 @@ static void xs_tcp_state_change(struct sock *sk)
case TCP_ESTABLISHED:
spin_lock_bh(&xprt->transport_lock);
if (!xprt_test_and_set_connected(xprt)) {
struct sock_xprt *transport = container_of(xprt,
struct sock_xprt, 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;
transport->tcp_offset = 0;
transport->tcp_reclen = 0;
transport->tcp_copied = 0;
transport->tcp_flags = XPRT_COPY_RECM | XPRT_COPY_XID;
xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
xprt_wake_pending_tasks(xprt, 0);
}