STRUCT ETHTOOL_TCPIP4_SPEC(9)

💅 struct ethtool_tcpip4_spec(9) — flow spec realness 💅

okay so bestie, this is the Kernel API Manual page for struct ethtool_tcpip4_spec, and I folded the manual name right in here so we don’t have to copy that boring double-header line. This struct is literally the blueprint for a flow specification, and we’re about to vibe-check every single field. no cap. 🫶

✨ NAME ✨

struct ethtool_tcpip4_spec — flow specification for TCP/IPv4 etc.

🌸 SYNOPSIS 🌸

struct ethtool_tcpip4_spec {
    __be32 ip4src;
    __be32 ip4dst;
    __be16 psrc;
    __be16 pdst;
    __u8 tos;
};

🎀 Members 🎀

okay these are the fields, and each one is doing its little job, bestie:

• ip4src — Source host. the origin story.
• ip4dst — Destination host. where we’re going.
• psrc — Source port.
• pdst — Destination port.
• tos — Type-of-service. yes, that exact hyphen vibe.

💖 Description 💖

No cap: this can be used to specify a TCP/IPv4, UDP/IPv4 or SCTP/IPv4 flow. that’s the whole description, and it ate. 💅

🦋 SEE ALSO 🦋

the reference list starts with the kernel file itself, then goes absolutely feral with related pages — every single one is here, no skipping:

• Kernel file ./include/uapi/linux/ethtool.h
• 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_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_flow_ext(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)

okay bye bestie 💖 this page comes from ./include/uapi/linux, it’s dated October 2026, and the footer name is struct ethtool_tcpip4_spec(9). mwah — go slay your flow specs. 🎀