netdev - Re: HW accelerated support for setting skb->pkt

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Message-Id: <20131219.001645.1578105338168883753.davem@davemloft.net>
Date:	Thu, 19 Dec 2013 00:16:45 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	f.fainelli@...il.com
Cc:	netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: HW accelerated support for setting skb->pkt_type?

From: Florian Fainelli <f.fainelli@...il.com>
Date: Wed, 18 Dec 2013 18:29:37 -0800

> I work with two Ethernet controllers which can tell on a per-packet
> basis whether this is a broadcast, unicast or multicast, eventually
> allowing me to bypass the initial checks done in eth_type_trans().
> 
> Is there any other hardware out there which supports that, and is
> there any interest in optimizing that operation?

There is zero benefit from this, since you're going to have to touch
the packet headers anyways and the memory access from that dwarfs
anything else.
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