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

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Date:	Sun, 10 Apr 2016 09:55:50 +0200
From:	Thomas Graf <tgraf@...g.ch>
To:	Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:	Jamal Hadi Salim <jhs@...atatu.com>,
	Tom Herbert <tom@...bertland.com>,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	Brenden Blanco <bblanco@...mgrid.com>,
	"David S. Miller" <davem@...emloft.net>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	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>,
	Johannes Berg <johannes@...solutions.net>,
	eranlinuxmellanox@...il.com, Lorenzo Colitti <lorenzo@...gle.com>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [RFC PATCH v2 1/5] bpf: add PHYS_DEV prog type for early driver
 filter

On 04/09/16 at 10:26am, Alexei Starovoitov wrote:
> On Sat, Apr 09, 2016 at 11:29:18AM -0400, Jamal Hadi Salim wrote:
> > If this is _forwarding only_ it maybe useful to look at
> > Alexey's old code in particular the DMA bits;
> > he built his own lookup algorithm but sounds like bpf is
> > a much better fit today.
> 
> a link to these old bits?
> 
> Just to be clear: this rfc is not the only thing we're considering.
> In particular huawei guys did a monster effort to improve performance
> in this area as well. We'll try to blend all the code together and
> pick what's the best.

What's the plan on opening the discussion on this? Can we get a peek?
Is it an alternative to XDP and the driver hook? Different architecture
or just different implementation? I understood it as another pseudo
skb model with a path on converting to real skbs for stack processing.

I really like the current proposal by Brenden for its simplicity and
targeted compatibility with cls_bpf.