netdev - Re: [PATCH net] netfilter: flowtable: Fix expired flow not being deleted from software

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Date:   Mon, 11 May 2020 00:26:40 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Paul Blakey <paulb@...lanox.com>
Cc:     Oz Shlomo <ozsh@...lanox.com>, Roi Dayan <roid@...lanox.com>,
        netdev@...r.kernel.org, Saeed Mahameed <saeedm@...lanox.com>,
        netfilter-devel@...r.kernel.org
Subject: Re: [PATCH net] netfilter: flowtable: Fix expired flow not being
 deleted from software

On Wed, May 06, 2020 at 02:27:29PM +0300, Paul Blakey wrote:
> Once a flow is considered expired, it is marked as DYING, and
> scheduled a delete from hardware. The flow will be deleted from
> software, in the next gc_step after hardware deletes the flow
> (and flow is marked DEAD). Till that happens, the flow's timeout
> might be updated from a previous scheduled stats, or software packets
> (refresh). This will cause the gc_step to no longer consider the flow
> expired, and it will not be deleted from software.
> 
> Fix that by looking at the DYING flag as in deciding
> a flow should be deleted from software.

Would this work for you?

The idea is to skip the refresh if this has already expired.

Thanks.

View attachment "expired.patch" of type "text/x-diff" (1236 bytes)