netdev - Re: [RFC PATCH 0/4] r8169: support dash

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Date:   Tue, 30 Nov 2021 19:09:26 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Hayes Wang <hayeswang@...ltek.com>
Cc:     "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        nic_swsd <nic_swsd@...ltek.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
Subject: Re: [RFC PATCH 0/4] r8169: support dash

On Wed, 1 Dec 2021 02:57:00 +0000 Hayes Wang wrote:
> Jakub Kicinski <kuba@...nel.org>
> > Sent: Tuesday, November 30, 2021 2:00 AM
> > Subject: Re: [RFC PATCH 0/4] r8169: support dash
> > 
> > On Mon, 29 Nov 2021 18:13:11 +0800 Hayes Wang wrote:  
> > > These patches are used to support dash for RTL8111EP and
> > > RTL8111FP(RTL81117).  
> > 
> > If I understand correctly DASH is a DMTF standard for remote control.
> > 
> > Since it's a standard I think we should have a common way of
> > configuring it across drivers.  
> 
> Excuse me. I am not familiar with it.
> What document or sample code could I start?
> 
> > Is enable/disable the only configuration
> > that we will need?  
> 
> I don't think I could answer it before I understand the above way
> you mentioned.
> 
> > We don't use sysfs too much these days, can we move the knob to
> > devlink, please? (If we only need an on/off switch generic devlink param
> > should be fine).  
> 
> Thanks. I would study devlink.

I'm not sure how relevant it will be to you but this is the
documentation we have:

https://www.kernel.org/doc/html/latest/networking/devlink/index.html
https://www.kernel.org/doc/html/latest/networking/devlink/devlink-params.html

You'll need to add a generic parameter (define + a short description)
like 325e0d0aa683 ("devlink: Add 'enable_iwarp' generic device param")

In terms of driver changes I think the most relevant example to you
will be:

drivers/net/ethernet/ti/cpsw_new.c

You need to call devlink_alloc(), devlink_register and
devlink_params_register() (and the inverse functions).