genphy_c45_..._get_sqi_max(9)

💅 genphy_c45_..._get_sqi_max(9) 💅

okay so bestie, this little icon lives in the Kernel API Manual and it's all about asking a PHY how good its vibes can possibly get. yes we're talking Signal Quality. yes it's as cute as it sounds. let's go 🫶

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✨ NAME ✨

genphy_c45_oatc14_get_sqi_max — literally just "Get maximum supported SQI or SQI+ level of OATC14 10Base-T1S PHY". that's the whole job. she gets the max. she's a getter. queen behavior 👑

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🌸 SYNOPSIS 🌸

int genphy_c45_oatc14_get_sqi_max (struct phy_device *phydev );

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🦋 ARGUMENTS 🦋

• phydev — pointer to the phy_device structure. that's the PHY device in question, our main character for this function 💖

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🔥 DESCRIPTION 🔥

so what does she do. this function returns the maximum supported Signal Quality Indicator (SQI) — or the SQI+ level, if that's the flavor we're in. the way that it just hands you the ceiling of how good your signal quality readout can go. iconic.

one tiny detail that's lowkey important: the SQI capability gets updated on first invocation — but only if it hasn't already been updated. so first call does the little housekeeping, and after that she already knows and doesn't need to redo it. efficient! we stan ✨

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⭐ RETURN ⭐

• Maximum SQI/SQI+ level supported 💖
• Negative errno on capability read failure 😭 (yeah, if the capability read flops, you get a negative errno. sad but honest)

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🌈 SEE ALSO 🌈

the besties!! the whole group chat!! the kernel file is ./drivers/net/phy/phy-c45.c and here's everyone she hangs out with:

• 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_an_setup_master_slave(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(9)

like, that's the whole friend group. no cap, go read them too 🧚

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quick reminder bestie: this page is from ./drivers/net/phy, dated October 2026, and the page itself is genphy_c45_..._get_sqi_max(9). mwah 💋 🎀