[PATCH net-next 12/13] net: phy: phylink: Use phy_caps_lookup for fixed-link configuration
Kory Maincent
kory.maincent at bootlin.com
Mon Feb 24 06:04:40 PST 2025
On Mon, 24 Feb 2025 13:53:28 +0000
"Russell King (Oracle)" <linux at armlinux.org.uk> wrote:
> On Mon, Feb 24, 2025 at 02:44:31PM +0100, Kory Maincent wrote:
> > On Sat, 22 Feb 2025 15:27:24 +0100
> > Maxime Chevallier <maxime.chevallier at bootlin.com> wrote:
> >
> > > When phylink creates a fixed-link configuration, it finds a matching
> > > linkmode to set as the advertised, lp_advertising and supported modes
> > > based on the speed and duplex of the fixed link.
> > >
> > > Use the newly introduced phy_caps_lookup to get these modes instead of
> > > phy_lookup_settings(). This has the side effect that the matched
> > > settings and configured linkmodes may now contain several linkmodes (the
> > > intersection of supported linkmodes from the phylink settings and the
> > > linkmodes that match speed/duplex) instead of the one from
> > > phy_lookup_settings().
> >
> > ...
> >
> > >
> > > linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT, mask);
> > > linkmode_set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, mask);
> > > @@ -588,9 +591,9 @@ static int phylink_parse_fixedlink(struct phylink *pl,
> > >
> > > phylink_set(pl->supported, MII);
> > >
> > > - if (s) {
> > > - __set_bit(s->bit, pl->supported);
> > > - __set_bit(s->bit, pl->link_config.lp_advertising);
> > > + if (c) {
> > > + linkmode_or(pl->supported, pl->supported, match);
> > > + linkmode_or(pl->link_config.lp_advertising,
> > > pl->supported, match);
> >
> > You are doing the OR twice. You should use linkmode_copy() instead.
>
> No, we don't want to copy pl->supported to
> pl->link_config.lp_advertising. We just want to set the linkmode bit
> that corresponds to the speed/duplex in each mask.
>
> That will result in e.g. the pause mode bits will be overwritten despite
> being appropriately set in the advertising mask in the code above this.
Ok, so the right thing should be this:
linkmode_or(pl->link_config.lp_advertising, pl->link_config.lp_advertising,
match)
Regards,
--
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com
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