netdev - Re: [PATCH] vlan: Support sending custom Ethernet CRC.

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Date:	Mon, 05 Mar 2012 23:12:13 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	greearb@...delatech.com
Cc:	netdev@...r.kernel.org, kaber@...sh.net
Subject: Re: [PATCH] vlan: Support sending custom Ethernet CRC.

From: Ben Greear <greearb@...delatech.com>
Date: Mon, 05 Mar 2012 19:59:57 -0800

> On 03/05/2012 06:14 PM, David Miller wrote:
>> From: greearb@...delatech.com
>> Date: Mon,  5 Mar 2012 18:05:58 -0800
>>
>>> NOTE:  You will probably have to disable any
>>> VLAN hardware assist on the underlying device to get
>>> this to properly send packets with this feature enabled.
>>
>> This need to be therefore handled specifically on a device-by-device
>> basis, and VLAN custom CRC disabled unless the device explicitly
>> states that it can handle this situation properly and has any
>> necessary feature rule enforcement codified.
> 
> I'll see what I can come up with.  Maybe figure out how to propagate
> a flag up from the NIC when it is in a state that can handle VLAN +
> custom-CRC
> and only enable the flag on the VLAN in that case...

NETIF_F_CAN_VLAN_WITH_CUSTOM_CRC
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