netdev - Re: [PATCH] net: Fix test for VLAN TX checksum offload capability

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Message-ID: <48537C94.70009@trash.net>
Date:	Sat, 14 Jun 2008 10:08:52 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Ben Hutchings <bhutchings@...arflare.com>
CC:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-net-drivers@...arflare.com
Subject: Re: [PATCH] net: Fix test for VLAN TX checksum offload capability

Ben Hutchings wrote:
> Selected device feature bits can be propagated to VLAN devices, so we
> can make use of TX checksum offload and TSO on VLAN-tagged packets.
> However, if the physical device does not do VLAN tag insertion or
> generic checksum offload then the test for TX checksum offload in
> dev_queue_xmit() will see a protocol of htons(ETH_P_8021Q) and yield
> false.
> 
> This splits the checksum offload test into two functions:
> 
> - can_checksum_protocol() tests a given protocol against a feature bitmask
> 
> - dev_can_checksum() first tests the skb protocol against the device
>   features; if that fails and the protocol is htons(ETH_P_8021Q) then
>   it tests the encapsulated protocol against the effective device
>   features for VLANs
> 
> Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>

Acked-by: Patrick McHardy <kaber@...sh.net>
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