netdev - Re: [PATCH net-next 2/4] bnxt_en: Use NETIF_F_GRO

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Message-ID: <CACKFLik-yLSCPMyV__CfDZaZfLWCHo6x74-7bWT+Ox1cVJfMpA@mail.gmail.com>
Date:   Mon, 4 Dec 2017 10:11:38 -0800
From:   Michael Chan <michael.chan@...adcom.com>
To:     Or Gerlitz <gerlitz.or@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 2/4] bnxt_en: Use NETIF_F_GRO_HW.

On Mon, Dec 4, 2017 at 8:35 AM, Or Gerlitz <gerlitz.or@...il.com> wrote:
> On Mon, Dec 4, 2017 at 1:12 PM, Michael Chan <michael.chan@...adcom.com> wrote:
>> Advertise NETIF_F_GRO_HW if hardware GRO is supported.  Turn on or off
>> hardware GRO based on NETIF_F_GRO_HW.
>
> So the patch only deals with advertisement biz.. and I even failed to
> find a place where you arm
> something in the FW... so this just works OOB, all your buffers && skb
> logic && FW setup are fully
> ready for that? also, nothing you need to put differently on the SKB
> for HW GRO completions?
> can you explain this little further or it's all in your netdev slides...
>

All the logic is already in these 3 drivers in the tree.  You can see
the additional logic in any of these drivers.  It's just that these
drivers have been using NETIF_F_GRO to turn on this mode in
hardware/firmware.  So these patches are just to switch over to use
the new flag to turn on this mode so that it can be independently
turned on or off.