netdev - Re: [RFC PATCH v2 1/5] bpf: add PHYS_DEV prog type for early driver filter

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Message-ID: <20160409142759.25d8464a@redhat.com>
Date:	Sat, 9 Apr 2016 14:27:59 +0200
From:	Jesper Dangaard Brouer <brouer@...hat.com>
To:	Tom Herbert <tom@...bertland.com>
Cc:	Brenden Blanco <bblanco@...mgrid.com>,
	"David S. Miller" <davem@...emloft.net>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Edward Cree <ecree@...arflare.com>,
	john fastabend <john.fastabend@...il.com>,
	Thomas Graf <tgraf@...g.ch>,
	Johannes Berg <johannes@...solutions.net>,
	eranlinuxmellanox@...il.com, Lorenzo Colitti <lorenzo@...gle.com>,
	brouer@...hat.com
Subject: Re: [RFC PATCH v2 1/5] bpf: add PHYS_DEV prog type for early driver
 filter

On Sat, 9 Apr 2016 08:17:04 -0300
Tom Herbert <tom@...bertland.com> wrote:

> One other API issue is how to deal with encapsulation. In this case a
> header may be prepended to the packet, I assume there are BPF helper
> functions and we don't need to return a new length or start?

That reminds me.  Do the BPF program need to know the head-room, then?

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  Author of http://www.iptv-analyzer.org
  LinkedIn: http://www.linkedin.com/in/brouer