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Date:	Tue, 28 Oct 2014 12:23:05 -0700
From:	Guenter Roeck <>
To:	Florian Fainelli <>
Cc:, "David S. Miller" <>,
	Andrew Lunn <>,
Subject: Re: [PATCH v2 01/15] net: dsa: Don't set skb->protocol on outgoing
 tagged packets

On Tue, Oct 28, 2014 at 12:19:21PM -0700, Florian Fainelli wrote:
> On 10/26/2014 09:52 AM, Guenter Roeck wrote:
> > Setting skb->protocol to a private protocol type may result in warning
> > messages such as
> > 	e1000e 0000:00:19.0 em1: checksum_partial proto=dada!
> > 
> > This happens if the L3 protocol is IP or IPv6 and skb->ip_summed is set
> > to CHECKSUM_PARTIAL. Looking through the code, it appears that changing
> > skb->protocol for transmitted packets is not necessary and may actually
> > be harmful. Drop it.
> You could emphasize that overriding skb->protocol prevents purposely
> unmodified (from a DSA perspective) network drivers from properly
> setting up their transmit checksum offload pointers since they inspect
> skb->protocol to setup the IPv4 header or IPv6 header pointers.
Ok, I'll do that.

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