From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: Gianfar ethernet drop package
Date: Fri, 24 Aug 2012 20:17:03 +0200
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To: =?ISO-8859-1?Q?An=EDbal?= Almeida Pinto <anibal.pinto@efacec.com>
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On Fri, 2012-08-24 at 17:14 +0100, An=C3=ADbal Almeida Pinto wrote:
> Hi,
>=20
> I have an board with a ppc with a 8379, kernel 3.0.39 and with a Gian=
far=20
> Ethernet Controller Version 1.2.
>=20
> When connect the board to office network the number of dropped packet=
s=20
> reported by ifconfig continues to increase.
>=20
> Following the test made at [1] I use tcpdump and when running it the=20
> number of drop packages don't have increased.
>=20
> When executing ethtool eth0 -S it return a rx-dropped-by-kernel !=3D =
0.=20
> And the rest of drop packages
>=20
> Is possible to get info why the packages are dropped?

You receive frames for unknown protocols. So they are dropped.

When running tcpdump, your tcpdump get them, they are not dropped.

So just parse your tcpdump output ?