igb_force_mac_fc(9)

✨ NAME ✨

okay bestie, welcome to igb_force_mac_fc(9) from the Kernel API Manual 💅 this is literally the function that forces the MAC's flow control settings. no cap, that's the whole main-character job.

🌸 SYNOPSIS 🌸

s32 igb_force_mac_fc (struct e1000_hw *hw );

🎀 ARGUMENTS 🎀

• hw — pointer to the HW structure. that's it, that's the vibe: hand over the hardware struct and let the function cook 🫶

💖 DESCRIPTION 💖

so what's the tea? Force the MAC's flow control settings. It sets the TFCE and RFCE bits in the device control register so they reflect the adapter settings ✨

TFCE and RFCE need to be explicitly set by software when a copper PHY is used, because autonegotiation is managed by the PHY rather than the MAC. Software must also configure these bits when link is forced on a fiber connection. like, don't skip that part, it's giving important 💀

🦋 SEE ALSO 🦋

the whole friend group, fr fr:

• Kernel file: ./drivers/net/ethernet/intel/igb/e1000_mac.c
• igb_get_bus_info_pcie(9)
• igb_clear_vfta(9)
• igb_write_vfta(9)
• igb_init_rx_addrs(9)
• igb_find_vlvf_slot(9)
• igb_vfta_set(9)
• igb_check_alt_mac_addr(9)
• igb_rar_set(9)
• igb_mta_set(9)
• igb_hash_mc_addr(9)
• igb_i21x_hw_doublecheck(9)
• igb_update_mc_addr_list(9)
• igb_clear_hw_cntrs_base(9)
• igb_check_for_copper_link(9)
• igb_setup_link(9)
• igb_config_collision_dist(9)
• igb_set_fc_watermarks(9)
• igb_set_default_fc(9)
• igb_config_fc_after_link_up(9)
• igb_get_speed_and_duplex_copper(9)
• igb_get_hw_semaphore(9)
• igb_put_hw_semaphore(9)
• igb_get_auto_rd_done(9)
• igb_valid_led_default(9)
• igb_id_led_init(9)
• igb_cleanup_led(9)
• igb_blink_led(9)
• igb_led_off(9)
• igb_disable_pcie_master(9)
• igb_validate_mdi_setting(9)
• igb_write_8bit_ctrl_reg(9)
• igb_enable_mng_pass_thru(9)

source/version vibes: this page lives in ./drivers/net/ethernet/intel/igb, dated October 2026, and it's serving igb_force_mac_fc(9) realness. mwah 💋✨