igb_get_cable_length_m88(9)

✨ igb_get_cable_length_m88(9) ✨

okay so bestie, welcome to the Kernel API Manual — this is the page for igb_get_cable_length_m88(9), and it's literally about figuring out how long the cable is. yes. the physical cable. we're measuring vibes in meters 💅

🎀 NAME 🎀

igb_get_cable_length_m88 — determine cable length for the m88 PHY 🧚

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🌸 SYNOPSIS 🌸

s32 igb_get_cable_length_m88 (struct e1000_hw *hw );

💖 ARGUMENTS 💖

• hw — pointer to the HW structure, aka the whole hardware situation. she's the main character of this function 🫶

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🔥 DESCRIPTION 🔥

So basically this function reads the PHY specific status register to pull out the cable length info 👑 that's the whole move.

Then, because the register is kind of an icon but not super precise, the cable length gets determined by averaging the minimum and maximum values to get the "average" cable length. math but make it lowkey 🌈

The m88 PHY has four possible cable length values, and here's the whole mapping, no cap:

• Register Value 0 → < 50 meters
• Register Value 1 → 50 - 80 meters
• Register Value 2 → 80 - 110 meters
• Register Value 3 → 110 - 140 meters
• Register Value 4 → > 140 meters

that's it, that's the scale. four vibes, five rows, it's giving precision-by-bracket 💀✨

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🦋 SEE ALSO 🦋

Kernel file:

• ./drivers/net/ethernet/intel/igb/e1000_phy.c

and the whole friend group (yes, the entire group chat, iykyk):

• igb_check_reset_block(9)
• igb_get_phy_id(9)
• igb_phy_reset_dsp(9)
• igb_read_phy_reg_mdic(9)
• igb_write_phy_reg_mdic(9)
• igb_read_phy_reg_i2c(9)
• igb_write_phy_reg_i2c(9)
• igb_read_sfp_data_byte(9)
• igb_read_phy_reg_igp(9)
• igb_write_phy_reg_igp(9)
• igb_copper_link_setup_82580(9)
• igb_copper_link_setup_m88(9)
• igb_copper_link_setup_m88_gen2(9)
• igb_copper_link_setup_igp(9)
• igb_copper_link_autoneg(9)
• igb_phy_setup_autoneg(9)
• igb_setup_copper_link(9)
• igb_phy_force_speed_duplex_igp(9)
• igb_phy_force_speed_duplex_m88(9)
• igb_phy_force_speed_duplex_setup(9)
• igb_set_d3_lplu_state(9)
• igb_check_downshift(9)
• igb_check_polarity_m88(9)
• igb_check_polarity_igp(9)
• igb_wait_autoneg(9)
• igb_phy_has_link(9)
• igb_get_cable_length_igp_2(9)
• igb_get_phy_info_m88(9)
• igb_get_phy_info_igp(9)
• igb_phy_sw_reset(9)
• igb_phy_hw_reset(9)
• igb_phy_init_script_igp3(9)
• igb_initialize_M88E1512_phy(9)
• igb_initialize_M88E1543_phy(9)
• igb_power_up_phy_copper(9)
• igb_power_down_phy_copper(9)
• igb_check_polarity_82580(9)
• igb_phy_force_speed_duplex_82580(9)
• igb_get_phy_info_82580(9)
• igb_get_cable_length_82580(9)
• igb_set_master_slave_mode(9)

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and that's the whole page, bestie 🎀✨

cute little sign-off before you go: this one lives under ./drivers/net/ethernet/intel/igb and the version/date situation is October 2026 — so she's dated, she's sourced, she's iconic. love that for her 💜🦋