phy_interface_mode_is_8023z(9)

💅 phy_interface_mode_is_8023z(9) — kernel api manual ✨

okay so bestie, welcome to the Kernel API Manual entry for phy_interface_mode_is_8023z(9). this one is short and sweet and honestly kind of a vibe check for your PHY 🧚

---

🌸 NAME 🌸

phy_interface_mode_is_8023z — literally answers the question: does this PHY interface mode use 802.3z negotiation? yes/no, that's the whole plot 🎀

---

✨ SYNOPSIS ✨

bool phy_interface_mode_is_8023z (phy_interface_t mode );

that's it. one argument, returns a bool. no cap, she's lowkey minimal 💅

---

🦋 ARGUMENTS 🦋

• mode — one of enum phy_interface_t. like, any member of that enum, bestie, that's the whole requirement 🫶

---

💖 DESCRIPTION 💖

returns true if the PHY interface mode uses the 16-bit negotiation word as defined in 802.3z. yes, the actual 16-bit one, not the other ones 🙈

see 802.3-2015 37.2.1 Config_Reg encoding — that's where the lore lives, go read it iykyk 📖

---

👑 SEE ALSO 👑

kernel file ./include/linux/phy.h plus the whole extended universe, fr fr:

• enum phy_interface_t(9)
• phy_modes(9)
• rgmii_clock(9)
• struct mdio_bus_stats(9)
• struct mii_bus(9)
• mdiobus_alloc(9)
• enum phy_state(9)
• struct phy_c45_device_ids(9)
• struct phy_oatc14_sqi_capability(9)
• struct phy_device(9)
• struct phy_tdr_config(9)
• enum link_inband_signalling(9)
• struct phy_plca_cfg(9)
• struct phy_plca_status(9)
• struct phy_led(9)
• struct phy_mse_capability(9)
• struct phy_mse_snapshot(9)
• struct phy_driver(9)
• phy_id_compare(9)
• phy_id_compare_vendor(9)
• phy_id_compare_model(9)
• phydev_id_compare(9)
• phy_is_started(9)
• phy_driver_is_genphy(9)
• phy_disable_eee_mode(9)
• phy_can_wakeup(9)
• phy_may_wakeup(9)
• phy_read(9)
• __phy_read(9)
• phy_write(9)
• __phy_write(9)
• __phy_modify_changed(9)
• phy_read_mmd_poll_timeout(9)
• __phy_set_bits(9)
• __phy_clear_bits(9)
• phy_set_bits(9)
• phy_clear_bits(9)
• __phy_set_bits_mmd(9)
• __phy_clear_bits_mmd(9)
• phy_set_bits_mmd(9)
• phy_clear_bits_mmd(9)
• phy_interrupt_is_valid(9)
• phy_polling_mode(9)
• phy_has_hwtstamp(9)
• phy_has_rxtstamp(9)
• phy_has_tsinfo(9)
• phy_has_txtstamp(9)
• phy_is_default_hwtstamp(9)
• phy_on_sfp(9)
• phy_interface_mode_is_rgmii(9)
• phy_interface_is_rgmii(9)
• phy_is_pseudo_fixed_link(9)
• phy_module_driver(9)

like, that's a whole friend group and every single one of them is iconic 💜

---

🍓 cute lil sign-off: this page lives in ./include/linux and the version stamp says October 2026, and the footer still spells it phy_interface_mode_is_8023z(9) in case you needed to hear it one more time bestie 😭✨

slay, go check your PHY modes 🦋💅