linux-kernel - Re: [RFC PATCH net-next v3 07/21] ethtool: implement EVENT notifications

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Message-ID: <20190218234608.GI14879@lunn.ch>
Date:   Tue, 19 Feb 2019 00:46:08 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Michal Kubecek <mkubecek@...e.cz>
Cc:     netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jiri Pirko <jiri@...nulli.us>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH net-next v3 07/21] ethtool: implement EVENT
 notifications

On Mon, Feb 18, 2019 at 07:21:59PM +0100, Michal Kubecek wrote:
> Three types of netlink notifications are introduced:
> 
>   - ETHA_EVENT_NEWDEV to notify about newly registered network devices
>   - ETHA_EVENT_DELDEV to notify about unregistered network devices
>   - ETHA_EVENT_RENAMEDEV to notify about renamed network device
> 
> The notifications are triggered by NETDEV_REGISTER, NETDEV_UNREGISTER and
> NETDEV_CHANGENAME notifiers.
> 
> These notifications are intended for applications and daemons monitoring
> ethtool events to allow updating the list of existing devices without
> having to open another socket for rtnetlink.

Hi Michal

Does ETHA_EVENT_RENAMEDEV actually contain enough information to avoid
needing a rtnetlink lookup? If i understand the code correctly, all
you have is the new name. You don't know the old name?

Having said that, i don't see an easy way to get access to the old
name when handling the NETDEV_CHANGENAME.

     Andrew