net_sched: fix qdisc_pkt_len_init()

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@google.com>
Cc: Yuval Mintz <yuvalmin@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/dev.c b/net/core/dev.c
index 862eaa7..b6d2b32 100644 (file)
--- 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