netdev - Re: [PATCH v4 2/7] net/tcp: Consistently align TCP-AO option in the header

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Date: Wed, 29 Nov 2023 18:02:03 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: Dmitry Safonov <dima@...sta.com>
Cc: David Ahern <dsahern@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Jakub Kicinski <kuba@...nel.org>, "David S. Miller" <davem@...emloft.net>, linux-kernel@...r.kernel.org, 
	Dmitry Safonov <0x7f454c46@...il.com>, Francesco Ruggeri <fruggeri05@...il.com>, 
	Salam Noureddine <noureddine@...sta.com>, Simon Horman <horms@...nel.org>, netdev@...r.kernel.org
Subject: Re: [PATCH v4 2/7] net/tcp: Consistently align TCP-AO option in the header

On Wed, Nov 29, 2023 at 5:57 PM Dmitry Safonov <dima@...sta.com> wrote:
>
> Currently functions that pre-calculate TCP header options length use
> unaligned TCP-AO header + MAC-length for skb reservation.
> And the functions that actually write TCP-AO options into skb do align
> the header. Nothing good can come out of this for ((maclen % 4) != 0).
>
> Provide tcp_ao_len_aligned() helper and use it everywhere for TCP
> header options space calculations.
>
> Fixes: 1e03d32bea8e ("net/tcp: Add TCP-AO sign to outgoing packets")
> Signed-off-by: Dmitry Safonov <dima@...sta.com>

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