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

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Message-ID: <87k01hbtbs.fsf@nvidia.com>
Date:   Fri, 20 Jan 2023 08:38:30 +0200
From:   Vlad Buslov <vladbu@...dia.com>
To:     Marcelo Ricardo Leitner <marcelo.leitner@...il.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 19 Jan 2023 at 18:37, Marcelo Ricardo Leitner <marcelo.leitner@...il.com> wrote:
> 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?

Hi Marcelo,

I know that for some reason offloaded entries no longer display
'assured' flag in the dump. This could be changed, but I don't have a
preference either way and this patch set doesn't modify the behavior.
Up to you and maintainers I guess.