tree dea836b730e718b1e6f07f22ab3d0797e540a998
parent 4ca24152d8919508bc53827a79e68b353ac6e333
author Benjamin Herrenschmidt <benh@kernel.crashing.org> 1491440572 +1000
committer David S. Miller <davem@davemloft.net> 1491518385 -0700

ftgmac100: Work around HW bug in runt frame detection

The HW incorrectly calculates the frame size without the vlan
tag and compares that against 64. It will thus flag 64-bytes
frames with a vlan tag as 60-bytes frames "runt" packets
which we'll then drop. Thus we end up dropping ARP packets
on vlan's ...

It does that whether vlan tag stripping is enabled or not.

This works around it by ignoring the "runt" error bit of the
frame has been vlan tagged and is at least 60 bytes.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David S. Miller <davem@davemloft.net>