netdev - Re: [PATCH net-next v2 RFC 7/8] devlink: Add a generic port parameter

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Date:   Tue, 11 Dec 2018 23:35:31 -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 v2 RFC 7/8] devlink: Add a generic port parameter

On Tue, Dec 11, 2018 at 10:18 AM Jakub Kicinski
<jakub.kicinski@...ronome.com> wrote:
>
> On Tue, 11 Dec 2018 14:16:47 +0530, Vasundhara Volam wrote:
> > wake-on-lan - Enables Wake on Lan for this port. If enabled,
> > the controller asserts a wake pin based on the wake-on-lan type.
> >
> > Cc: Jiri Pirko <jiri@...lanox.com>
> > Signed-off-by: Vasundhara Volam <vasundhara-v.volam@...adcom.com>
>
> As explained previously I think it's a very bad idea to add existing
> configuration options to devlink, just because devlink has the ability
> to persist the setting in NVM.  Especially that for WoL you have to get
> the link up so you potentially have all link config stuff as well.  And
> that n-tuple filters are one of the WoL options, meaning we'd need the
> ability to persist n-tuple filters via devlink.

As I said before, firmware will automatically set the link to autoneg
up to the speed supported by Vaux if WoL is enabled.  No special link
setting is needed as I said before.  I don't think n-tuple is suitable
for the default power-up WoL setting.  n-tuple requires ip address.
The ip address belongs to the system, not to the card that can move
from system to system.  The n-tuple WoL packet should be a transient
setting set by the OS that won't persist a power down.  The default
power-up WoL packet types should be the most basic magic packet and
other basic types.  So I really don't think there is a need to persist
n-tuple WoL packet types.