STRUCT ETHTOOL_FLOW_EXT(9)

🌸 struct ethtool_flow_ext(9) 🌸

okay so bestie, this little icon is from the Kernel API Manual, and it's literally all about the extra RX flow fields. it's giving "bonus filter details" energy, and we're gonna go through every single one. no skipping, no cap 💅

💖 NAME 💖

struct ethtool_flow_ext — additional RX flow fields

✨ SYNOPSIS ✨

struct ethtool_flow_ext {
    __u8 padding[2];
    unsigned char   h_dest[ETH_ALEN];
    __be16 vlan_etype;
    __be16 vlan_tci;
    __be32 data[2];
 };

🫶 Members 🫶

• padding — Reserved for future use; see the note on reserved space. bestie, it's just vibing there for later.
• h_dest — destination MAC address.
• vlan_etype — VLAN EtherType.
• vlan_tci — VLAN tag control information.
• data — user defined data.

🌟 Description 🌟

real talk: vlan_etype, vlan_tci, and data are only valid if FLOW_EXT is set in struct ethtool_rx_flow_spec flow_type. and h_dest is valid if FLOW_MAC_EXT is set. like, that's the whole vibe check for when these fields actually mean something 👑

🌈 SEE ALSO 🌈

Kernel file ./include/uapi/linux/ethtool.h — and here's the whole squad, fr fr:

• struct ethtool_cmd(9)
• struct ethtool_drvinfo(9)
• struct ethtool_wolinfo(9)
• struct ethtool_regs(9)
• struct ethtool_eeprom(9)
• struct ethtool_eee(9)
• struct ethtool_modinfo(9)
• struct ethtool_coalesce(9)
• struct ethtool_ringparam(9)
• struct ethtool_channels(9)
• struct ethtool_pauseparam(9)
• enum ethtool_stringset(9)
• enum ethtool_mac_stats_src(9)
• enum ethtool_module_power_mode_policy(9)
• enum ethtool_module_power_mode(9)
• enum ethtool_c33_pse_ext_state(9)
• enum ethtool_c33_pse_ext_substate_mr_mps_valid(9)
• enum ethtool_c33_pse_ext_substate_error_condition(9)
• enum ethtool_c33_pse_ext_substate_mr_pse_enable(9)
• enum ethtool_c33_pse_ext_substate_option_detect_ted(9)
• enum ethtool_c33_pse_ext_substate_option_vport_lim(9)
• enum ethtool_c33_pse_ext_substate_ovld_detected(9)
• enum ethtool_c33_pse_ext_substate_power_not_available(9)
• enum ethtool_c33_pse_ext_substate_short_detected(9)
• enum ethtool_pse_types(9)
• enum ethtool_c33_pse_admin_state(9)
• enum ethtool_c33_pse_pw_d_status(9)
• enum ethtool_podl_pse_admin_state(9)
• enum ethtool_podl_pse_pw_d_status(9)
• enum ethtool_mm_verify_status(9)
• enum ethtool_module_fw_flash_status(9)
• struct ethtool_gstrings(9)
• struct ethtool_sset_info(9)
• enum ethtool_test_flags(9)
• struct ethtool_test(9)
• struct ethtool_stats(9)
• struct ethtool_perm_addr(9)
• struct ethtool_tcpip4_spec(9)
• struct ethtool_ah_espip4_spec(9)
• struct ethtool_usrip4_spec(9)
• struct ethtool_tcpip6_spec(9)
• struct ethtool_ah_espip6_spec(9)
• struct ethtool_usrip6_spec(9)
• struct ethtool_rx_flow_spec(9)
• struct ethtool_rxnfc(9)
• struct ethtool_rxfh_indir(9)
• struct ethtool_rxfh(9)
• struct ethtool_rx_ntuple_flow_spec(9)
• struct ethtool_rx_ntuple(9)
• struct ethtool_dump(9)
• struct ethtool_get_features_block(9)
• struct ethtool_gfeatures(9)
• struct ethtool_set_features_block(9)
• struct ethtool_sfeatures(9)
• struct ethtool_ts_info(9)
• struct ethtool_per_queue_op(9)
• struct ethtool_fecparam(9)
• enum ethtool_fec_config_bits(9)
• struct ethtool_link_settings(9)
• enum phy_upstream(9)

signed off with love from the source/version ./include/uapi/linux, dated October 2026 💖✨ periodt