STRUCT ETHTOOL_MODINFO(9)

💖 NAME 💖

okay bestie, welcome to the struct ethtool_modinfo(9) page from the Kernel API Manual — it’s giving plugin module eeprom information, and honestly it’s a tiny but iconic little struct 🎀

🦋 SYNOPSIS 🦋

struct ethtool_modinfo {
    __u32 cmd;
    __u32 type;
    __u32 eeprom_len;
    __u32 reserved[8];
 };

🎀 Members 🎀

quick vibe check on the fields, bestie:

• cmd — ETHTOOL_GMODULEINFO 👑
• type — the standard the module information conforms to: ETH_MODULE_SFF_xxxx ✨
• eeprom_len — length of the eeprom 📏
• reserved — reserved for future use; see the note on reserved space 🫶

🌈 Description 🌈

okay so this structure is used to return the information to properly size memory for a subsequent call to ETHTOOL_GMODULEEEPROM — literally the pre-game for your eeprom read, no cap 💅

and the type code indicates the eeprom data format, so that’s the little label that tells you what format you’re looking at 🦋

✨ SEE ALSO ✨

the whole cross-reference friend group, no skips:

• 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_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_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)

and that’s the page, periodt 💅 — source/version is ./include/uapi/linux, dated October 2026, so jot that down and go slay your eeprom sizing 🫶✨