From 82011c80b3ec0e05940a2ee2c76c1df9fd2b1ce8 Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Tue, 5 Jan 2021 10:15:09 -0500 Subject: SUNRPC: Move svc_xprt_received() call sites Currently, XPT_BUSY is not cleared until xpo_recvfrom returns. That effectively blocks the receipt and handling of the next RPC message until the current one has been taken off the transport. This strict ordering is a requirement for socket transports. For our kernel RPC/RDMA transport implementation, however, dequeuing an ingress message is nothing more than a list_del(). The transport can safely be marked un-busy as soon as that is done. To keep the changes simpler, this patch just moves the svc_xprt_received() call site from svc_handle_xprt() into the transports, so that the actual optimization can be done in a subsequent patch. Signed-off-by: Chuck Lever --- net/sunrpc/svcsock.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'net/sunrpc/svcsock.c') diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c index 22454b2df5be..9eb5b6b89077 100644 --- a/net/sunrpc/svcsock.c +++ b/net/sunrpc/svcsock.c @@ -519,6 +519,7 @@ static int svc_udp_recvfrom(struct svc_rqst *rqstp) if (serv->sv_stats) serv->sv_stats->netudpcnt++; + svc_xprt_received(rqstp->rq_xprt); return len; out_recv_err: @@ -527,7 +528,7 @@ out_recv_err: set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); } trace_svcsock_udp_recv_err(&svsk->sk_xprt, err); - return 0; + goto out_clear_busy; out_cmsg_err: net_warn_ratelimited("svc: received unknown control message %d/%d; dropping RPC reply datagram\n", cmh->cmsg_level, cmh->cmsg_type); @@ -536,6 +537,8 @@ out_bh_enable: local_bh_enable(); out_free: kfree_skb(skb); +out_clear_busy: + svc_xprt_received(rqstp->rq_xprt); return 0; } @@ -1033,6 +1036,7 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp) if (serv->sv_stats) serv->sv_stats->nettcpcnt++; + svc_xprt_received(rqstp->rq_xprt); return rqstp->rq_arg.len; err_incomplete: @@ -1050,13 +1054,14 @@ error: if (len != -EAGAIN) goto err_delete; trace_svcsock_tcp_recv_eagain(&svsk->sk_xprt, 0); - return 0; + goto err_noclose; err_nuts: svsk->sk_datalen = 0; err_delete: trace_svcsock_tcp_recv_err(&svsk->sk_xprt, len); svc_xprt_deferred_close(&svsk->sk_xprt); err_noclose: + svc_xprt_received(rqstp->rq_xprt); return 0; /* record not complete */ } -- cgit v1.2.3