netdev - ip_forward notification for driver

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Message-ID: <CAHRDKfRZEw3Mq9GP3rCf2U10Y7X7N61BNZCa95tKESZkVD2qAg@mail.gmail.com>
Date:   Thu, 10 Nov 2022 09:51:35 +0200
From:   Leonid Komaryanskiy <lkomaryanskiy@...il.com>
To:     netdev@...r.kernel.org
Cc:     dmytro_firsov@...m.com
Subject: ip_forward notification for driver

Hello.

I'm working on L3 routing offload for switch device and have a
question about ip_forwarding. I want to disable/enable forwarding on
the hardware side according to changing value in
/proc/sys/net/ipv4/ip_forward. As I see, inet_netconf_notify_devconf
just sends rtnl_notify for userspace. Could I ask you for advice, on
how can I handle updating value via some notifier or some other Linux
mechanism in driver?

Thank you in advance.

Kind Regards, Leonid.