netdev - Re: [RFC] packet: handle too big packets for PACKET

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Message-ID: <20140815101932.GA26489@hmsreliant.think-freely.org>
Date:	Fri, 15 Aug 2014 06:19:32 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Daniel Borkmann <dborkman@...hat.com>,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [RFC] packet: handle too big packets for PACKET_V3

On Thu, Aug 14, 2014 at 05:56:20PM -0700, Eric Dumazet wrote:
> On Fri, 2014-08-15 at 02:50 +0200, Hannes Frederic Sowa wrote:
> 
> > 5) Or let a setsockopt control the NETIF_F_GRO bit of an interface if it
> > is bound to it? This will likely result in an implementation where we
> > must count current TPACKET_V3 sockets disabling GRO on an interface,
> > much like promisc counter.
> 
> loopback interface has MTU = 64K, it looks like the problem is not tied
> to GRO.
> 
Can we add a listener to the af packet code to resize the block length of the
socket based on the MTU?  

I realize that overloads user configuration, but if we warn them...

Neil
> 
> 
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