Re: [PATCH net] net: change skb->mac_header when Generic XDP calls adjust_head

From: Edward Cree <redacted>
Date: Tue, 19 Sep 2017 18:45:56 +0100

Since XDP's view of the packet includes the MAC header, moving the start-
 of-packet with bpf_xdp_adjust_head needs to also update the offset of the
 MAC header (which is relative to skb->head, not to the skb->data that was
 changed).
Without this, tcpdump sees packets starting from the old MAC header rather
 than the new one, at least in my tests on the loopback device.

Fixes: b5cdae3291f7 ("net: Generic XDP")
Signed-off-by: Edward Cree <redacted>

Applied and queued up for -stable, thanks Edward.