netdev - Re: [PATCH net-next 1/4] net: Introduce NETIF_F_GRO

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Message-ID: <CAJ3xEMg7wLeqmZF7yWBv4VR2fwVDdwRYdq7jpjoPBNhXgFsg7Q@mail.gmail.com>
Date:   Mon, 4 Dec 2017 18:30:04 +0200
From:   Or Gerlitz <gerlitz.or@...il.com>
To:     Michael Chan <michael.chan@...adcom.com>
Cc:     David Miller <davem@...emloft.net>,
        Linux Netdev List <netdev@...r.kernel.org>,
        Ariel Elior <Ariel.Elior@...ium.com>,
        everest-linux-l2@...ium.com
Subject: Re: [PATCH net-next 1/4] net: Introduce NETIF_F_GRO_HW

On Mon, Dec 4, 2017 at 1:12 PM, Michael Chan <michael.chan@...adcom.com> wrote:
> Introduce NETIF_F_GRO_HW feature flag for NICs that support hardware GRO.  W

cool

> --- a/Documentation/networking/netdev-features.txt
> +++ b/Documentation/networking/netdev-features.txt
> @@ -163,3 +163,10 @@ This requests that the NIC receive all possible frames, including errored
>  frames (such as bad FCS, etc).  This can be helpful when sniffing a link with
>  bad packets on it.  Some NICs may receive more packets if also put into normal
>  PROMISC mode.
> +
> +*  rx-gro-hw
> +
> +This requests that the NIC enables Hardware GRO (generic receive offload).
> +Hardware GRO is basically the exact reverse of TSO, and is generally
> +stricter than Hardware LRO.  A packet stream merged by Hardware GRO must
> +be re-segmentable by GSO or TSO back to the exact packet stream.

Can you please add here a 1-2 liner with the grocery store list of requirements
for that matter or pointer to another kernel doc spot where this is defined.