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

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Message-ID: <570A502A.3050006@mojatatu.com>
Date:	Sun, 10 Apr 2016 09:07:54 -0400
From:	Jamal Hadi Salim <jhs@...atatu.com>
To:	Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:	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>,
	Thomas Graf <tgraf@...g.ch>,
	Johannes Berg <johannes@...solutions.net>,
	eranlinuxmellanox@...il.com, Lorenzo Colitti <lorenzo@...gle.com>,
	linux-mm <linux-mm@...ck.org>,
	Robert Olsson <robert@...julf.net>, kuznet@....inr.ac.ru
Subject: Re: [RFC PATCH v2 1/5] bpf: add PHYS_DEV prog type for early driver
 filter

On 16-04-09 01:26 PM, Alexei Starovoitov wrote:

>
> yeah, no stack, no queues in bpf.

Thanks.

>
>> 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?
>

Dang. Trying to remember exact name (I think it has been gone for at
least 10 years now). I know it is not CONFIG_NET_FASTROUTE although
it could have been that depending on the driver (tulip had some
nice DMA properties - which by todays standards would be considered
primitive ;->).
+Cc Robert and Alexey (Trying to figure out name of driver based
routing code that DMAed from ingress to egress port)

> 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.
>

Sounds very interesting.

cheers,
jamal