linux-kernel - Re: [PATCH 0/2] net: Set maximum receive packet size on veth interfaces

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Message-Id: <20170509.134839.2008658486655854998.davem@davemloft.net>
Date:   Tue, 09 May 2017 13:48:39 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     fredrik.markstrom@...il.com
Cc:     eric.dumazet@...il.com, stephen@...workplumber.org, ast@...nel.org,
        daniel@...earbox.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bridge@...ts.linux-foundation.org
Subject: Re: [PATCH 0/2] net: Set maximum receive packet size on veth
 interfaces

From: Fredrik Markstrom <fredrik.markstrom@...il.com>
Date: Tue,  9 May 2017 14:44:36 +0200

> Currently veth drops all packets larger then the mtu set on the
> receiving end of the pair. This is inconsistent with most hardware
> ethernet drivers.

False.

In fact, many pieces of ethernet hardware a not physically capable of
sending even VLAN packets that are above the normal base ethernet MTU.

It is therefore untenable to remove this restriction univerally like
this.