genphy_c45_a...master_slave(9)

💅 genphy_c45_an_setup_master_slave — the kernel API manual moment 🎀

okay so bestie, welcome to the glow-up of genphy_c45_a...master_slave(9) from the Kernel API Manual ✨ this is the page where we sort out who's the boss of the 10GBASE-T link, and honestly? it's giving main character energy 👑

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✨ NAME ✨

genphy_c45_an_setup_master_slave — Configure Master/Slave setting for C45 PHYs 🦋

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🌸 SYNOPSIS 🌸

int genphy_c45_an_setup_master_slave (struct phy_device *phydev );

like, that's the whole vibe. one function, one arg, go off 💅

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🎀 ARGUMENTS 🎀

• phydev — the target phy_device struct 🫶 that's the PHY we're about to negotiate with, no cap

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🔥 DESCRIPTION 🔥

okay so here's the tea ☕ — this one configures the forced or preferred Master/Slave role in the 10GBASE-T control register (that's MMD 7, Register 0x0020 for the nerds keeping score 🧚), all according to IEEE 802.3 standards. iconic behavior, honestly 🌈

like, it's literally just deciding who wears the crown in the master/slave situation and doing it the standards-compliant way. periodt 💀

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⭐ RETURN ⭐

• negative errno code on failure 😭 — something went wrong, check your errno bestie
• 0 if Master/Slave didn't change — nothing to do, we stay as we were 😌
• 1 if Master/Slave modes changed — glow-up achieved, slay ✨

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🌈 SEE ALSO 🌈

buckle up bestie, this list is LONG and we're not skipping a single one 💖 the kernel file is ./drivers/net/phy/phy-c45.c and here's the whole squad:

• genphy_c45_baset1_able(9)
• genphy_c45_pma_can_sleep(9)
• genphy_c45_pma_resume(9)
• genphy_c45_pma_suspend(9)
• genphy_c45_pma_baset1_setup_master_slave(9)
• genphy_c45_pma_setup_forced(9)
• genphy_c45_an_config_aneg(9)
• genphy_c45_an_disable_aneg(9)
• genphy_c45_restart_aneg(9)
• genphy_c45_check_and_restart_aneg(9)
• genphy_c45_pma_soft_reset(9)
• genphy_c45_read_master_slave(9)
• genphy_c45_aneg_done(9)
• genphy_c45_read_link(9)
• genphy_c45_read_lpa(9)
• genphy_c45_pma_baset1_read_master_slave(9)
• genphy_c45_read_pma(9)
• genphy_c45_read_mdix(9)
• genphy_c45_write_eee_adv(9)
• genphy_c45_read_eee_adv(9)
• genphy_c45_read_eee_lpa(9)
• genphy_c45_read_eee_cap1(9)
• genphy_c45_read_eee_cap2(9)
• genphy_c45_read_eee_abilities(9)
• genphy_c45_an_config_eee_aneg(9)
• genphy_c45_pma_baset1_read_abilities(9)
• genphy_c45_pma_read_ext_abilities(9)
• genphy_c45_pma_read_abilities(9)
• genphy_c45_read_status(9)
• genphy_c45_config_aneg(9)
• genphy_c45_fast_retrain(9)
• genphy_c45_plca_get_cfg(9)
• genphy_c45_plca_set_cfg(9)
• genphy_c45_plca_get_status(9)
• genphy_c45_eee_is_active(9)
• genphy_c45_ethtool_get_eee(9)
• genphy_c45_ethtool_set_eee(9)
• oatc14_cable_test_get_result_code(9)
• genphy_c45_oatc14_cable_test_get_status(9)
• genphy_c45_oatc14_cable_test_start(9)
• oatc14_update_sqi_capability(9)
• genphy_c45_oatc14_get_sqi_max(9)
• genphy_c45_oatc14_get_sqi(9)

like, that's the whole friend group 🫶 iykyk 💜

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ngl this page lives in ./drivers/net/phy, dropped October 2026, and its whole title is genphy_c45_a...master_slave(9) in case you forgot where you were 💫

okay bye bestie, go configure some PHYs and stay iconic 🦋💅✨