netdev - Re: [PATCH net-next 2/4] sfc: implement encap TSO on EF100

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Date:   Fri, 30 Oct 2020 16:13:26 +0000
From:   Edward Cree <ecree@...arflare.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
CC:     <linux-net-drivers@...arflare.com>,
        Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 2/4] sfc: implement encap TSO on EF100

On 30/10/2020 15:49, Willem de Bruijn wrote:
> On Wed, Oct 28, 2020 at 9:39 PM Edward Cree <ecree@...arflare.com> wrote:
>> +                             ESF_GZ_TX_TSO_ED_OUTER_UDP_LEN, encap && !gso_partial,
> 
> This is a boolean field to signal whether the NIC needs to fix up the
> udp length field ?
Yes.

> Which in the case of GSO_PARTIAL has already been resolved by the gso
> layer (in __skb_udp_tunnel_segment).
Indeed.

> Just curious, is this ever expected to be true? Not based on current
> advertised features, right?
As I mentioned in the patch description and cover letter, I'm not
 entirely certain.  I don't _think_ the stack will ever give us an
 encap skb without GSO_PARTIAL with the features we've advertised,
 but since the hardware supports it I thought it better to handle
 that case anyway, just in case I'm mistaken.

-ed