diff options
author | Neil Brown <neilb@suse.de> | 2010-03-01 16:51:14 +1100 |
---|---|---|
committer | J. Bruce Fields <bfields@citi.umich.edu> | 2010-05-03 08:33:00 -0400 |
commit | b48fa6b99100dc7772af3cd276035fcec9719ceb (patch) | |
tree | 415dba87c6c5de0ab85a8493f864838f4f3cc005 | |
parent | 26c0c75e69265961e891ed80b38fb62a548ab371 (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.c | 4 | ||||
-rw-r--r-- | net/sunrpc/svcsock.c | 15 | ||||
-rw-r--r-- | net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 3 |
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; } |