netdev - Re: [PATCH net-next RFC 7/7] bnxt_en: Add bnxt_en initial port params table and register it

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Message-ID: <CACKFLikR5G1vca31hyjJ3uZbV1Zq-86a9=qXeUaO1gqosDg9GQ@mail.gmail.com>
Date:   Wed, 5 Dec 2018 16:01:08 -0800
From:   Michael Chan <michael.chan@...adcom.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     Vasundhara Volam <vasundhara-v.volam@...adcom.com>,
        David Miller <davem@...emloft.net>,
        Jiri Pirko <jiri@...lanox.com>, Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next RFC 7/7] bnxt_en: Add bnxt_en initial port params
 table and register it

On Wed, Dec 5, 2018 at 3:33 PM Jakub Kicinski
<jakub.kicinski@...ronome.com> wrote:
>
> On Wed,  5 Dec 2018 11:27:00 +0530, Vasundhara Volam wrote:
> > Register devlink_port with devlink and create initial port params
> > table for bnxt_en. The table consists of a generic parameter:
> >
> > wake-on-lan: Enables Wake on Lan for this port when magic packet
> > is received with this port's MAC address using ACPI pattern.
> > If enabled, the controller asserts a wake pin upon reception of
> > WoL packet.  ACPI (Advanced Configuration and Power Interface) is
> > an industry specification for the efficient handling of power
> > consumption in desktop and mobile computers.
> >
> > Cc: Michael Chan <michael.chan@...adcom.com>
> > Signed-off-by: Vasundhara Volam <vasundhara-v.volam@...adcom.com>
>
> Why do we need a WoL as a devlink parameter (rather than ethtool -s)?

I believe ethtool -s for WoL is a non-persistent setting, meaning that
if you power cycle the system, the WoL setting will go back to
default.

devlink on the other hand is a permanent setting.  ethtool should
initially report the default WoL setting and it can then be changed
(in a non permanent way) using ethtool -s.