From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jamal Hadi Salim <jhs@mojatatu.com>
Subject: Re: [RFC PATCH v2 1/5] bpf: add PHYS_DEV prog type for early driver
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Date: Sun, 10 Apr 2016 09:07:54 -0400
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Cc: Tom Herbert <tom@herbertland.com>,
 Jesper Dangaard Brouer <brouer@redhat.com>,
 Brenden Blanco <bblanco@plumgrid.com>, "David S. Miller"
 <davem@davemloft.net>,
 Linux Kernel Network Developers <netdev@vger.kernel.org>,
 Or Gerlitz <ogerlitz@mellanox.com>, Daniel Borkmann <daniel@iogearbox.net>,
 Eric Dumazet <eric.dumazet@gmail.com>, Edward Cree <ecree@solarflare.com>,
 john fastabend <john.fastabend@gmail.com>, Thomas Graf <tgraf@suug.ch>,
 Johannes Berg <johannes@sipsolutions.net>, eranlinuxmellanox@gmail.com,
 Lorenzo Colitti <lorenzo@google.com>, linux-mm <linux-mm@kvack.org>,
 Robert Olsson <robert@herjulf.net>, kuznet@ms2.inr.ac.ru
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>
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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

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