Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964819Ab3E2GkW (ORCPT ); Wed, 29 May 2013 02:40:22 -0400 Received: from mga03.intel.com ([143.182.124.21]:33917 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935005Ab3E2GkS (ORCPT ); Wed, 29 May 2013 02:40:18 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.87,763,1363158000"; d="scan'208";a="309352278" From: Eliezer Tamir Subject: [PATCH v6 net-next 3/5] tcp: add TCP support for low latency receive poll. To: David Miller Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Jesse Brandeburg , Don Skidmore , e1000-devel@lists.sourceforge.net, Willem de Bruijn , Eric Dumazet , Andi Kleen , HPA , Eilon Greenstien , Or Gerlitz , Alex Rosenbaum , Eliezer Tamir Date: Wed, 29 May 2013 09:39:45 +0300 Message-ID: <20130529063945.27486.61442.stgit@ladj378.jer.intel.com> In-Reply-To: <20130529063916.27486.3841.stgit@ladj378.jer.intel.com> References: <20130529063916.27486.3841.stgit@ladj378.jer.intel.com> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2408 Lines: 85 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); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/