netdev - Re: [PATCH net-next v7 0/8] devlink: Add configuration parameters support for devlink

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Message-ID: <20190205165133.GF21401@unicorn.suse.cz>
Date:   Tue, 5 Feb 2019 17:51:33 +0100
From:   Michal Kubecek <mkubecek@...e.cz>
To:     Vasundhara Volam <vasundhara-v.volam@...adcom.com>
Cc:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        "michael.chan@...adcom.com" <michael.chan@...adcom.com>,
        Jiri Pirko <jiri@...lanox.com>
Subject: Re: [PATCH net-next v7 0/8] devlink: Add configuration parameters
 support for devlink_port

On Tue, Feb 05, 2019 at 09:53:26AM +0530, Vasundhara Volam wrote:
> On Tue, Feb 5, 2019 at 8:26 AM Jakub Kicinski
> >
> > No?  We were talking about using the soon-too-come ethtool netlink
> > API with additional indication that given configuration request is
> > supposed to be persisted.  Adding more devlink parameters is exactly
> > the opposite of what you should be doing.
> 
> Okay. So, till then can we have the devlink wake_on_lan parameter or
> you want this to be removed? Could you please clarify?
> 
> Once ethtool netlink API is available with persisted support, I can remove
> this wake_on_lan parameter from devlink. Thanks.

Once you provide an interface for userspace and applications start using
it, it's hard to get rid of it. As an extreme example, the legacy ioctl
interface used by ifconfig has been declared obsolete since kernel 2.2.0
(January 1999, i.e. 20 years ago) and we still have to maintain it.

Michal Kubecek