target/linux/generic/backport-6.1/715-23-v6.4-net-phylink-actually-fix-ksettings_set-ethtool-call.patch

   1 From 11933aa76865621d8e82553c8f3bc07796a5aaa2 Mon Sep 17 00:00:00 2001
   2 From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
   3 Date: Thu, 1 Jun 2023 10:12:06 +0100
   4 Subject: [PATCH 20/21] net: phylink: actually fix ksettings_set() ethtool call
   5
   6 Raju Lakkaraju reported that the below commit caused a regression
   7 with Lan743x drivers and a 2.5G SFP. Sadly, this is because the commit
   8 was utterly wrong. Let's fix this properly by not moving the
   9 linkmode_and(), but instead copying the link ksettings and then
  10 modifying the advertising mask before passing the modified link
  11 ksettings to phylib.
  12
  13 Fixes: df0acdc59b09 ("net: phylink: fix ksettings_set() ethtool call")
  14 Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
  15 Link: https://lore.kernel.org/r/E1q4eLm-00Ayxk-GZ@rmk-PC.armlinux.org.uk
  16 Signed-off-by: Jakub Kicinski <kuba@kernel.org>
  17 ---
  18  drivers/net/phy/phylink.c | 15 ++++++++++-----
  19  1 file changed, 10 insertions(+), 5 deletions(-)
  20
  21 --- a/drivers/net/phy/phylink.c
  22 +++ b/drivers/net/phy/phylink.c
  23 @@ -2259,11 +2259,13 @@ int phylink_ethtool_ksettings_set(struct
  24
  25         ASSERT_RTNL();
  26
  27 -       /* Mask out unsupported advertisements */
  28 -       linkmode_and(config.advertising, kset->link_modes.advertising,
  29 -                    pl->supported);
  30 -
  31         if (pl->phydev) {
  32 +               struct ethtool_link_ksettings phy_kset = *kset;
  33 +
  34 +               linkmode_and(phy_kset.link_modes.advertising,
  35 +                            phy_kset.link_modes.advertising,
  36 +                            pl->supported);
  37 +
  38                 /* We can rely on phylib for this update; we also do not need
  39                  * to update the pl->link_config settings:
  40                  * - the configuration returned via ksettings_get() will come
  41 @@ -2282,10 +2284,13 @@ int phylink_ethtool_ksettings_set(struct
  42                  *   the presence of a PHY, this should not be changed as that
  43                  *   should be determined from the media side advertisement.
  44                  */
  45 -               return phy_ethtool_ksettings_set(pl->phydev, kset);
  46 +               return phy_ethtool_ksettings_set(pl->phydev, &phy_kset);
  47         }
  48
  49         config = pl->link_config;
  50 +       /* Mask out unsupported advertisements */
  51 +       linkmode_and(config.advertising, kset->link_modes.advertising,
  52 +                    pl->supported);
  53
  54         /* FIXME: should we reject autoneg if phy/mac does not support it? */
  55         switch (kset->base.autoneg) {