netdev - Re: [PATCH nf-next 1/1] netfilter: ctnetlink: Support offloaded conntrack entry deletion

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Message-ID: <ZCNQ0YqLR3OxMgd3@salvia>
Date:   Tue, 28 Mar 2023 22:40:49 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Paul Blakey <paulb@...dia.com>
Cc:     Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        netfilter-devel@...r.kernel.org, Oz Shlomo <ozsh@...dia.com>,
        Roi Dayan <roid@...dia.com>, Vlad Buslov <vladbu@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, coreteam@...filter.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH nf-next 1/1] netfilter: ctnetlink: Support offloaded
 conntrack entry deletion

Hi Paul,

Apologies for lagging to catch up with this.

On Wed, Mar 22, 2023 at 09:35:32AM +0200, Paul Blakey wrote:
> Currently, offloaded conntrack entries (flows) can only be deleted
> after they are removed from offload, which is either by timeout,
> tcp state change or tc ct rule deletion. This can cause issues for
> users wishing to manually delete or flush existing entries.
> 
> Support deletion of offloaded conntrack entries.
> 
> Example usage:
>  # Delete all offloaded (and non offloaded) conntrack entries
>  # whose source address is 1.2.3.4
>  $ conntrack -D -s 1.2.3.4
>  # Delete all entries
>  $ conntrack -F

This fine with me.

I think probably it much be documented somewhere that in case of
hardware offload, deletion is asynchronous.