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authorNeil Brown <neilb@suse.de>2010-03-01 16:51:14 +1100
committerJ. Bruce Fields <bfields@citi.umich.edu>2010-05-03 08:33:00 -0400
commitb48fa6b99100dc7772af3cd276035fcec9719ceb (patch)
tree415dba87c6c5de0ab85a8493f864838f4f3cc005
parent26c0c75e69265961e891ed80b38fb62a548ab371 (diff)
sunrpc: centralise most calls to svc_xprt_received
svc_xprt_received must be called when ->xpo_recvfrom has finished receiving a message, so that the XPT_BUSY flag will be cleared and if necessary, requeued for further work. This call is currently made in each ->xpo_recvfrom function, often from multiple different points. In each case it is the earliest point on a particular path where it is known that the protection provided by XPT_BUSY is no longer needed. However there are (still) some error paths which do not call svc_xprt_received, and requiring each ->xpo_recvfrom to make the call does not encourage robustness. So: move the svc_xprt_received call to be made just after the call to ->xpo_recvfrom(), and move it of the various ->xpo_recvfrom methods. This means that it may not be called at the earliest possible instant, but this is unlikely to be a measurable performance issue. Note that there are still other calls to svc_xprt_received as it is also needed when an xprt is newly created. Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
-rw-r--r--net/sunrpc/svc_xprt.c4
-rw-r--r--net/sunrpc/svcsock.c15
-rw-r--r--net/sunrpc/xprtrdma/svc_rdma_recvfrom.c3
3 files changed, 4 insertions, 18 deletions
diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index c334f5413c6..75f9aa2eb08 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -743,8 +743,10 @@ int svc_recv(struct svc_rqst *rqstp, long timeout)
if (rqstp->rq_deferred) {
svc_xprt_received(xprt);
len = svc_deferred_recv(rqstp);
- } else
+ } else {
len = xprt->xpt_ops->xpo_recvfrom(rqstp);
+ svc_xprt_received(xprt);
+ }
dprintk("svc: got len=%d\n", len);
}
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index a29f259204e..a3389273364 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -547,7 +547,6 @@ static int svc_udp_recvfrom(struct svc_rqst *rqstp)
dprintk("svc: recvfrom returned error %d\n", -err);
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
}
- svc_xprt_received(&svsk->sk_xprt);
return -EAGAIN;
}
len = svc_addr_len(svc_addr(rqstp));
@@ -562,11 +561,6 @@ static int svc_udp_recvfrom(struct svc_rqst *rqstp)
svsk->sk_sk->sk_stamp = skb->tstamp;
set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */
- /*
- * Maybe more packets - kick another thread ASAP.
- */
- svc_xprt_received(&svsk->sk_xprt);
-
len = skb->len - sizeof(struct udphdr);
rqstp->rq_arg.len = len;
@@ -917,7 +911,6 @@ static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
if (len < want) {
dprintk("svc: short recvfrom while reading record "
"length (%d of %d)\n", len, want);
- svc_xprt_received(&svsk->sk_xprt);
goto err_again; /* record header not complete */
}
@@ -953,7 +946,6 @@ static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
if (len < svsk->sk_reclen) {
dprintk("svc: incomplete TCP record (%d of %d)\n",
len, svsk->sk_reclen);
- svc_xprt_received(&svsk->sk_xprt);
goto err_again; /* record not complete */
}
len = svsk->sk_reclen;
@@ -961,14 +953,11 @@ static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp)
return len;
error:
- if (len == -EAGAIN) {
+ if (len == -EAGAIN)
dprintk("RPC: TCP recv_record got EAGAIN\n");
- svc_xprt_received(&svsk->sk_xprt);
- }
return len;
err_delete:
set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
- svc_xprt_received(&svsk->sk_xprt);
err_again:
return -EAGAIN;
}
@@ -1110,7 +1099,6 @@ out:
svsk->sk_tcplen = 0;
svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt);
- svc_xprt_received(&svsk->sk_xprt);
if (serv->sv_stats)
serv->sv_stats->nettcpcnt++;
@@ -1119,7 +1107,6 @@ out:
err_again:
if (len == -EAGAIN) {
dprintk("RPC: TCP recvfrom got EAGAIN\n");
- svc_xprt_received(&svsk->sk_xprt);
return len;
}
error:
diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
index f92e37eb413..0194de81493 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -566,7 +566,6 @@ static int rdma_read_complete(struct svc_rqst *rqstp,
ret, rqstp->rq_arg.len, rqstp->rq_arg.head[0].iov_base,
rqstp->rq_arg.head[0].iov_len);
- svc_xprt_received(rqstp->rq_xprt);
return ret;
}
@@ -665,7 +664,6 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp)
rqstp->rq_arg.head[0].iov_len);
rqstp->rq_prot = IPPROTO_MAX;
svc_xprt_copy_addrs(rqstp, xprt);
- svc_xprt_received(xprt);
return ret;
close_out:
@@ -678,6 +676,5 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp)
*/
set_bit(XPT_CLOSE, &xprt->xpt_flags);
defer:
- svc_xprt_received(xprt);
return 0;
}