netdev - Re: [PATCH v3 1/1] gro: decrease size of CB

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Date: Tue, 6 Jun 2023 09:25:27 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: Richard Gobert <richardbgobert@...il.com>
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com, 
	aleksander.lobakin@...el.com, lixiaoyan@...gle.com, lucien.xin@...il.com, 
	alexanderduyck@...com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/1] gro: decrease size of CB

On Thu, Jun 1, 2023 at 6:14 PM Richard Gobert <richardbgobert@...il.com> wrote:
>
> The GRO control block (NAPI_GRO_CB) is currently at its maximum size.
> This commit reduces its size by putting two groups of fields that are
> used only at different times into a union.
>
> Specifically, the fields frag0 and frag0_len are the fields that make up
> the frag0 optimisation mechanism, which is used during the initial
> parsing of the SKB.
>
> The fields last and age are used after the initial parsing, while the
> SKB is stored in the GRO list, waiting for other packets to arrive.
>
> There was one location in dev_gro_receive that modified the frag0 fields
> after setting last and age. I changed this accordingly without altering
> the code behaviour.
>
> Signed-off-by: Richard Gobert <richardbgobert@...il.com>

Reviewed-by: Eric Dumazet <edumazet@...gle.com>