netdev - [PATCH net-next] net_sched: fix qdisc_pkt_len

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Date:	Tue, 15 Jan 2013 21:14:21 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>,
	Yuval Mintz <yuvalmin@...adcom.com>
Subject: [PATCH net-next] net_sched: fix qdisc_pkt_len_init()

From: Eric Dumazet <edumazet@...gle.com>

commit 1def9238d4aa2 (net_sched: more precise pkt_len computation)
does a wrong computation of mac + network headers length, as it includes
the padding before the frame.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Yuval Mintz <yuvalmin@...adcom.com>
---
 net/core/dev.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 862eaa7..b6d2b32 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2776,8 +2776,12 @@ static void qdisc_pkt_len_init(struct sk_buff *skb)
 	 * we add to pkt_len the headers size of all segments
 	 */
 	if (shinfo->gso_size)  {
-		unsigned int hdr_len = skb_transport_offset(skb);
+		unsigned int hdr_len;
 
+		/* mac layer + network layer */
+		hdr_len = skb_transport_header(skb) - skb_mac_header(skb);
+
+		/* + transport layer */
 		if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)))
 			hdr_len += tcp_hdrlen(skb);
 		else


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