From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759522Ab3CZG3v (ORCPT ); Tue, 26 Mar 2013 02:29:51 -0400 Received: from mx1.redhat.com ([209.132.183.28]:55307 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759478Ab3CZG3a (ORCPT ); Tue, 26 Mar 2013 02:29:30 -0400 From: Jason Wang To: davem@davemloft.net, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: mst@redhat.com, Jason Wang , Eric Dumazet Subject: [net-next 3/5] packet: set transport header before doing xmit Date: Tue, 26 Mar 2013 14:19:57 +0800 Message-Id: <1364278799-37285-4-git-send-email-jasowang@redhat.com> In-Reply-To: <1364278799-37285-1-git-send-email-jasowang@redhat.com> References: <1364278799-37285-1-git-send-email-jasowang@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Set the transport header for 1) some drivers (e.g ixgbe needs l4 header to do atr) 2) precise packet length estimation (introduced in 1def9238) needs l4 header to compute header length. So this patch first tries to get l4 header for packet socket through skb_flow_dissect(), and pretend no l4 header if skb_flow_dissect() fails. Cc: Eric Dumazet Signed-off-by: Jason Wang --- net/packet/af_packet.c | 21 +++++++++++++++++++++ 1 files changed, 21 insertions(+), 0 deletions(-) diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index bd0d14c..83fdd0a 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -88,6 +88,7 @@ #include #include #include +#include #ifdef CONFIG_INET #include @@ -1412,6 +1413,7 @@ static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock, __be16 proto = 0; int err; int extra_len = 0; + struct flow_keys keys; /* * Get and verify the address. @@ -1512,6 +1514,11 @@ retry: if (unlikely(extra_len == 4)) skb->no_fcs = 1; + if (skb_flow_dissect(skb, &keys)) + skb_set_transport_header(skb, keys.thoff); + else + skb_reset_transport_header(skb); + dev_queue_xmit(skb); rcu_read_unlock(); return len; @@ -1918,6 +1925,7 @@ static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, struct page *page; void *data; int err; + struct flow_keys keys; ph.raw = frame; @@ -1943,6 +1951,11 @@ static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb, skb_reserve(skb, hlen); skb_reset_network_header(skb); + if (skb_flow_dissect(skb, &keys)) + skb_set_transport_header(skb, keys.thoff); + else + skb_reset_transport_header(skb); + if (po->tp_tx_has_off) { int off_min, off_max, off; off_min = po->tp_hdrlen - sizeof(struct sockaddr_ll); @@ -2199,6 +2212,7 @@ static int packet_snd(struct socket *sock, unsigned short gso_type = 0; int hlen, tlen; int extra_len = 0; + struct flow_keys keys; /* * Get and verify the address. @@ -2351,6 +2365,13 @@ static int packet_snd(struct socket *sock, len += vnet_hdr_len; } + if (skb->ip_summed == CHECKSUM_PARTIAL) + skb_set_transport_header(skb, skb_checksum_start_offset(skb)); + else if (skb_flow_dissect(skb, &keys)) + skb_set_transport_header(skb, keys.thoff); + else + skb_set_transport_header(skb, reserve); + if (unlikely(extra_len == 4)) skb->no_fcs = 1; -- 1.7.1