netdev - Re: [net-next v4 07/16] i40e: Rx checksum offload for VXLAN

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Message-ID: <CAJZOPZK_b=Ve1YXsHfZjyeOQiMxj_jAKscmgZT_AKCEK1+V1UA@mail.gmail.com>
Date:	Thu, 2 Jan 2014 23:31:48 +0200
From:	Or Gerlitz <or.gerlitz@...il.com>
To:	Joseph Gasparakis <joseph.gasparakis@...el.com>
Cc:	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"gospo@...hat.com" <gospo@...hat.com>,
	"sassmann@...hat.com" <sassmann@...hat.com>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>
Subject: Re: [net-next v4 07/16] i40e: Rx checksum offload for VXLAN

On Thu, Jan 2, 2014 at 10:57 PM, Joseph Gasparakis
<joseph.gasparakis@...el.com> wrote:

>
> > The comment says that the driver has to compute the udp checksum
> > **if** the packet has an outer udp checksum,
> > but the driver call to issue checksumming is done unconditionally
>
>
> This code runs when the right bits are set in the rx hardware descriptor
> field (rx_ptype and rx_status), which implies the hardware has detected
> ipv4 tunneling and there is non zero UDP csum.


Got it -- thanks for explaining, also for the pointer on where
skb->encapsulation is set
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