netdev - Re: [PATCH net-next v3 0/7] Allow offloading of UDP NEW connections via act

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Date:   Thu, 19 Jan 2023 18:37:07 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Vlad Buslov <vladbu@...dia.com>
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        pablo@...filter.org, netdev@...r.kernel.org,
        netfilter-devel@...r.kernel.org, jhs@...atatu.com,
        xiyou.wangcong@...il.com, jiri@...nulli.us, ozsh@...dia.com,
        simon.horman@...igine.com
Subject: Re: [PATCH net-next v3 0/7] Allow offloading of UDP NEW connections
 via act_ct

On Thu, Jan 19, 2023 at 08:50:57PM +0100, Vlad Buslov wrote:
> Currently only bidirectional established connections can be offloaded
> via act_ct. Such approach allows to hardcode a lot of assumptions into
> act_ct, flow_table and flow_offload intermediate layer codes. In order
> to enabled offloading of unidirectional UDP NEW connections start with
> incrementally changing the following assumptions:
> 
> - Drivers assume that only established connections are offloaded and
>   don't support updating existing connections. Extract ctinfo from meta
>   action cookie and refuse offloading of new connections in the drivers.

Hi Vlad,

Regarding ct_seq_show(). When dumping the CT entries today, it will do
things like:

        if (!test_bit(IPS_OFFLOAD_BIT, &ct->status))
                seq_printf(s, "%ld ", nf_ct_expires(ct)  / HZ);

omit the timeout, which is okay with this new patchset, but then:

        if (test_bit(IPS_HW_OFFLOAD_BIT, &ct->status))
                seq_puts(s, "[HW_OFFLOAD] ");
        else if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
                seq_puts(s, "[OFFLOAD] ");
        else if (test_bit(IPS_ASSURED_BIT, &ct->status))
                seq_puts(s, "[ASSURED] ");

Previously, in order to be offloaded, it had to be Assured. But not
anymore after this patchset. Thoughts?

  Marcelo