kernel: net: phy: c45: check validity of 10GbE LPA

Only use link-partner advertisement bits for 10GbE modes if they are
actually valid. Check LOCALOK and REMOTEOK bits and clear 10GbE modes
unless both of them are set.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

diff --git a/target/linux/generic/pending-6.12/713-net-phy-c45-check-validity-of-10GbE-link-partner.patch b/target/linux/generic/pending-6.12/713-net-phy-c45-check-validity-of-10GbE-link-partner.patch
new file mode 100644 (file)
index 0000000..5870dfb
--- /dev/null
+++ b/target/linux/generic/pending-6.12/713-net-phy-c45-check-validity-of-10GbE-link-partner.patch
@@ -0,0 +1,29 @@
+From 7d719484930bc10c8472c0d43b94b68087541b24 Mon Sep 17 00:00:00 2001
+From: Daniel Golle <daniel@makrotopia.org>
+Date: Sat, 22 Apr 2023 01:25:39 +0100
+Subject: [PATCH] net: phy: c45: check validity of 10GbE link-partner
+ advertisement
+
+Only use link-partner advertisement bits for 10GbE modes if they are
+actually valid. Check LOCALOK and REMOTEOK bits and clear 10GbE modes
+unless both of them are set.
+
+Signed-off-by: Daniel Golle <daniel@makrotopia.org>
+--- a/include/linux/mdio.h
++++ b/include/linux/mdio.h
+@@ -323,8 +323,14 @@ static inline u32 linkmode_adv_to_mii_10
+  * to linkmode advertisement settings. Other bits in advertising aren't changed.
+  */
+ static inline void mii_10gbt_stat_mod_linkmode_lpa_t(unsigned long *advertising,
+-                                                   u32 lpa)
++                                                   u32 lpa_in)
+ {
++      u32 lpa = lpa_in;
++
++      if (!(lpa & MDIO_AN_10GBT_STAT_REMOK) ||
++          !(lpa & MDIO_AN_10GBT_STAT_LOCOK))
++              lpa = 0;
++
+       linkmode_mod_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
+                        advertising, lpa & MDIO_AN_10GBT_STAT_LP2_5G);
+       linkmode_mod_bit(ETHTOOL_LINK_MODE_5000baseT_Full_BIT,