diff --git a/libc/kernel/uapi/linux/mdio.h b/libc/kernel/uapi/linux/mdio.h
index 725eb1a..2305f64 100644
--- a/libc/kernel/uapi/linux/mdio.h
+++ b/libc/kernel/uapi/linux/mdio.h
@@ -202,6 +202,28 @@
 #define MDIO_PMA_EXTABLE_10BT 0x0100
 #define MDIO_PMA_EXTABLE_BT1 0x0800
 #define MDIO_PMA_EXTABLE_NBT 0x4000
+#define MDIO_AN_C73_0_S_MASK GENMASK(4, 0)
+#define MDIO_AN_C73_0_E_MASK GENMASK(9, 5)
+#define MDIO_AN_C73_0_PAUSE BIT(10)
+#define MDIO_AN_C73_0_ASM_DIR BIT(11)
+#define MDIO_AN_C73_0_C2 BIT(12)
+#define MDIO_AN_C73_0_RF BIT(13)
+#define MDIO_AN_C73_0_ACK BIT(14)
+#define MDIO_AN_C73_0_NP BIT(15)
+#define MDIO_AN_C73_1_T_MASK GENMASK(4, 0)
+#define MDIO_AN_C73_1_1000BASE_KX BIT(5)
+#define MDIO_AN_C73_1_10GBASE_KX4 BIT(6)
+#define MDIO_AN_C73_1_10GBASE_KR BIT(7)
+#define MDIO_AN_C73_1_40GBASE_KR4 BIT(8)
+#define MDIO_AN_C73_1_40GBASE_CR4 BIT(9)
+#define MDIO_AN_C73_1_100GBASE_CR10 BIT(10)
+#define MDIO_AN_C73_1_100GBASE_KP4 BIT(11)
+#define MDIO_AN_C73_1_100GBASE_KR4 BIT(12)
+#define MDIO_AN_C73_1_100GBASE_CR4 BIT(13)
+#define MDIO_AN_C73_1_25GBASE_R_S BIT(14)
+#define MDIO_AN_C73_1_25GBASE_R BIT(15)
+#define MDIO_AN_C73_2_2500BASE_KX BIT(0)
+#define MDIO_AN_C73_2_5GBASE_KR BIT(1)
 #define MDIO_PHYXS_LNSTAT_SYNC0 0x0001
 #define MDIO_PHYXS_LNSTAT_SYNC1 0x0002
 #define MDIO_PHYXS_LNSTAT_SYNC2 0x0004