igb_phy_forc...duplex_setup(9)

💖 NAME 💖

igb_phy_force_speed_duplex_setup — Configure forced PHY speed/duplex

okay so welcome to the igb_phy_forc...duplex_setup(9) page in the Kernel API Manual — yes, the title is literally truncated like that, and no, we're not letting that stop us. This function is here to force PHY speed/duplex, and it's lowkey a whole little checklist. 💅

✨ SYNOPSIS ✨

void igb_phy_force_speed_duplex_setup (struct e1000_hw *hw , u16
       *phy_ctrl );

🌸 ARGUMENTS 🌸

• hw — pointer to the HW structure.
• phy_ctrl — pointer to current value of PHY_CONTROL.

🎀 DESCRIPTION 🎀

Forces speed and duplex on the PHY by doing the following, in this exact lineup:

• disable flow control
• force speed/duplex on the MAC
• disable auto speed detection
• disable auto-negotiation
• configure duplex
• configure speed
• configure the collision distance
• write configuration to CTRL register

Then the important bit: The caller must write to the PHY_CONTROL register for these settings to take affect. (That's the page's spelling, bestie — I'm not fixing it. 😭)

👑 SEE ALSO 👑

Kernel file: ./drivers/net/ethernet/intel/igb/e1000_phy.c

• 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_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_m88(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)

okay that's the whole thing, bestie. Cute sign-off: this page's source/version is ./drivers/net/ethernet/intel/igb, dated October 2026, and it answers to igb_phy_forc...duplex_setup(9). 💅✨