netdev - Re: Send SFP event from kernel driver to user space (UDEV)

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Message-ID: <3b83c628-50f2-754e-5618-e1e14c7035ba@mellanox.com>
Date:   Sun, 17 Nov 2019 13:52:48 +0000
From:   Shay Drory <shayd@...lanox.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     Maor Gottlieb <maorg@...lanox.com>,
        Eran Ben Elisha <eranbe@...lanox.com>,
        "lennart@...ttering.net" <lennart@...ttering.net>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Jiri Pirko <jiri@...lanox.com>,
        "systemd-devel@...ts.freedesktop.org" 
        <systemd-devel@...ts.freedesktop.org>,
        "mkubecek@...e.cz" <mkubecek@...e.cz>
Subject: Re: Send SFP event from kernel driver to user space (UDEV)

+relevant people

On 11/17/2019 13:46, Shay Drory wrote:
> Today, SFP inserted / removal event impacts only the kernel space drivers.
> There are users who wishes to get SFP insert / removal in a udev-event
> format for their application / daemons / monitors.
> The naive way to implement this feature would be to create a sysfs file
> that represents device SFP, to expose it under the netdev sysfs, and
> to raise a udev event over it.
> However, it is not reasonable to create a sysfs for each net-device.
> In this letter, I would like to offer a new mechanism that will add a
> support to send SFP events from the kernel driver to user space.
> This suggestion is built upon a new netlink infrastructure for ethtool
> currently being written by Michal Kubeckwhich called “ethtool-netlink”[1].
> My suggestion is to do it by adding a function
> (ethtool_sfp_insterted/removed(...)) to ethtool API, This function will
> raise a netlink event to be caught in user space.
> The design:
>
> - SFP event from NIC caught by the driver
> - Driver call ethtool_sfp_inserted/removed()
> - Ethtool generated netlink event with relevant data
> - This event-message will be handled in the user-space library of UDEV
> (for this purpose we would like to add a netlink infrastructure to UDEV
> user-space library).
>
> the flow in scheme:
>
> UDEV (in systemd)
>                   ↑
> ethtool_netlink (in ethtool)
>                   ↑
> driver (mlx5_core for example)
>                   ↑
> NIC (SFP event)
>
> Would like to hear your opinion on this suggestion, or on alternative
> designs.
>
> Thanks
> Shay Drory
>
> [1]
> https://patchwork.ozlabs.org/project/netdev/list/?series=&submitter=11892&state=*&q=&archive=&delegate=
>