netdev - Re: [Intel-wired-lan] [PATCH iwl-next v2 2/9] ethtool: Add forced speed to supported link modes maps

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Message-ID: <ZQMYUM3F/9v9cTQM@baltimore>
Date: Thu, 14 Sep 2023 16:27:28 +0200
From: Pawel Chmielewski <pawel.chmielewski@...el.com>
To: Andrew Lunn <andrew@...n.ch>
CC: Alexander Lobakin <aleksander.lobakin@...el.com>, "Greenwalt, Paul"
	<paul.greenwalt@...el.com>, <aelior@...vell.com>,
	<intel-wired-lan@...ts.osuosl.org>, <manishc@...vell.com>,
	<netdev@...r.kernel.org>
Subject: Re: [Intel-wired-lan] [PATCH iwl-next v2 2/9] ethtool: Add forced
 speed to supported link modes maps

On Sun, Sep 03, 2023 at 04:00:57PM +0200, Andrew Lunn wrote:
> > Let me check if I understand correctly- is that what was sent with the
> > v3 [1] , with the initialization helper (ethtool_forced_speed_maps_init)
> > and the structure map in the ethtool code? Or do you have another helper
> > in mind?
> 
> Sorry for the late reply, been on vacation.
> 
> The main thing is you try to reuse the table:
> 
> static const struct phy_setting settings[] = {}
> 
> If you can build your helper on top of phy_lookup_setting() even
> better. You don't need a phy_device to use those.
> 
> 	Andrew

Thank for the hint Andrew! I took a look into the phy-core code,
and a little into phylink. However, I still have the same concern
regarding modes that are supported/unsupported by hardware (managed
by the firmware in our case). Let's say I'm only looking for duplex
modes and iterate over speeds with advertised modes map as an argument
for phy_lookup_setting. In this case, I still need another table/map of
hardware compatible link modes to check against. Theese are actually
the maps we'd like to keep in the driver (and proposed in [1]), so
maybe the simple intersect check between them and the advertised modes
is sufficient?

[1] https://lore.kernel.org/netdev/20230823180633.2450617-4-pawel.chmielewski@intel.com/