From: Mike Sinkovsky <redacted>
Date: Wed, 28 Mar 2012 11:52:43 +0600

28.03.2012 8:35, David Miller wrote:

From Documentation/netdev-features.txt:

quoted

NETIF_F_VLAN_CHALLENGED should be set for devices which can't cope
with VLAN
headers. Some drivers set this because the cards can't handle the
bigger MTU.
[FIXME: Those cases could be fixed in VLAN code by allowing only
reduced-MTU
VLANs. This may be not useful, though.]

My case is exactly what is here in FIXME comment - yes, this chip
cannot handle full size MTU for VLANs, and TCP/IP traffic don't work
well over this VLAN.

I disagree with the comment in that document, I didn't write it.