netdev - Re: [PATCH net-next v1 07/10] net/mlx5e: Listen to ARP events to update IPsec L2 headers in tunnel mode

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Date:   Mon, 17 Apr 2023 15:34:12 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Leon Romanovsky <leonro@...dia.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        netdev@...r.kernel.org, Saeed Mahameed <saeedm@...dia.com>,
        Raed Salem <raeds@...dia.com>, Emeel Hakim <ehakim@...dia.com>
Subject: Re: [PATCH net-next v1 07/10] net/mlx5e: Listen to ARP events to
 update IPsec L2 headers in tunnel mode

On Thu, Apr 13, 2023 at 03:29:25PM +0300, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@...dia.com>
> 
> In IPsec packet offload mode all header manipulations are performed by
> hardware, which is responsible to add/remove L2 header with source and
> destinations MACs.
> 
> CX-7 devices don't support offload of in-kernel routing functionality,
> as such HW needs external help to fill other side MAC as it isn't
> available for HW.
> 
> As a solution, let's listen to neigh ARP updates and reconfigure IPsec
> rules on the fly once new MAC data information arrives.
> 
> Signed-off-by: Leon Romanovsky <leonro@...dia.com>

Reviewed-by: Simon Horman <simon.horman@...igine.com>