From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eliezer Tamir Subject: [PATCH v6 net-next 3/5] tcp: add TCP support for low latency receive poll. Date: Wed, 29 May 2013 09:39:45 +0300 Message-ID: <20130529063945.27486.61442.stgit@ladj378.jer.intel.com> References: <20130529063916.27486.3841.stgit@ladj378.jer.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Willem de Bruijn , Or Gerlitz , e1000-devel@lists.sourceforge.net, netdev@vger.kernel.org, HPA , linux-kernel@vger.kernel.org, Alex Rosenbaum , Jesse Brandeburg , Eliezer Tamir , Andi Kleen , Eric Dumazet , Eilon Greenstien To: David Miller Return-path: In-Reply-To: <20130529063916.27486.3841.stgit@ladj378.jer.intel.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: e1000-devel-bounces@lists.sourceforge.net List-Id: netdev.vger.kernel.org Adds busy-poll support for TCP. Copy the napi_id from an incomming skb to the sk in tcp_v[46]_rcv(). when there is no data in the socket we busy-poll in tcp_recvmsg(). This is a good example of how to add busy-poll support to new protocols. Signed-off-by: Alexander Duyck Signed-off-by: Jesse Brandeburg Tested-by: Willem de Bruijn Signed-off-by: Eliezer Tamir --- net/ipv4/tcp.c | 5 +++++ net/ipv4/tcp_ipv4.c | 2 ++ net/ipv6/tcp_ipv6.c | 2 ++ 3 files changed, 9 insertions(+), 0 deletions(-) diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index ba4186e..becd105 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -279,6 +279,7 @@ #include #include +#include int sysctl_tcp_fin_timeout __read_mostly = TCP_FIN_TIMEOUT; @@ -1551,6 +1552,10 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, struct sk_buff *skb; u32 urg_hole = 0; + if (sk_valid_ll(sk) && skb_queue_empty(&sk->sk_receive_queue) + && (sk->sk_state == TCP_ESTABLISHED)) + sk_poll_ll(sk, nonblock); + lock_sock(sk); err = -ENOTCONN; diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index d20ede0..35fd8bc 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -75,6 +75,7 @@ #include #include #include +#include #include #include @@ -2011,6 +2012,7 @@ process: if (sk_filter(sk, skb)) goto discard_and_relse; + sk_mark_ll(sk, skb); skb->dev = NULL; bh_lock_sock_nested(sk); diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 0a17ed9..5cffa5c 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -63,6 +63,7 @@ #include #include #include +#include #include @@ -1498,6 +1499,7 @@ process: if (sk_filter(sk, skb)) goto discard_and_relse; + sk_mark_ll(sk, skb); skb->dev = NULL; bh_lock_sock_nested(sk); ------------------------------------------------------------------------------ Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET Get 100% visibility into your production application - at no cost. Code-level diagnostics for performance bottlenecks with <2% overhead Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap1 _______________________________________________ E1000-devel mailing list E1000-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired