netdev - Re: [PATCH v2 1/5] net: Support ethtool ops for rx of errored frames.

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Date:	Mon, 20 Jun 2011 00:48:00 +0200
From:	Francois Romieu <romieu@...zoreil.com>
To:	Ben Greear <greearb@...delatech.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH v2 1/5] net:  Support ethtool ops for rx of errored frames.

Ben Greear <greearb@...delatech.com> :
> On 06/18/2011 02:34 PM, Francois Romieu wrote:
> >greearb@...delatech.com<greearb@...delatech.com>  :
> >[...]
> >>This can be useful when sniffing dodgy networks.
> >
> >Do you plan to add something similar - i.e. not per packet - for the Tx path ?
> 
> Ability to tx errored frames?  I posted a patch to enable sending
> frames with custom (ie, invalid) Ethernet FCS, but you have to
> enable it per-socket, and it will only work with AF_PACKET sockets.
> 
> Can you offer more details on what you are asking for?

Realtek's 816[89] and 810[23] have no room in their Tx descriptors to
control ethernet checksum generation. There is a global register (TxConfig)
though. Before looking at the per-socket information, the driver would need
to be instructed to disable Tx hardware ethernet checksumming globally.

-- 
Ueimor
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