netdev - Re: [RFC PATCH 0/5] Add driver bpf hook for early packet drop

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Date:	Sat, 02 Apr 2016 20:41:31 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Brenden Blanco <bblanco@...mgrid.com>, davem@...emloft.net
Cc:	netdev@...r.kernel.org, tom@...bertland.com,
	alexei.starovoitov@...il.com, gerlitz@...lanox.com,
	daniel@...earbox.net, john.fastabend@...il.com, brouer@...hat.com,
	Lorenzo Colitti <lorenzo@...gle.com>
Subject: Re: [RFC PATCH 0/5] Add driver bpf hook for early packet drop

On Fri, 2016-04-01 at 18:21 -0700, Brenden Blanco wrote:
> This patch set introduces new infrastructure for programmatically
> processing packets in the earliest stages of rx, as part of an effort
> others are calling Express Data Path (XDP) [1]. Start this effort by
> introducing a new bpf program type for early packet filtering, before
> even
> an skb has been allocated.
> 
> With this, hope to enable line rate filtering, with this initial
> implementation providing drop/allow action only.

Since this is handed to the driver in some way, I assume the API would
also allow offloading the program to the NIC itself, and as such be
useful for what Android wants to do to save power in wireless?

johannes