i40e_parse_r...ow_user_data(9)

💅 i40e_parse_rx_flow_user_data — from the Kernel API Manual, bestie

okay so this one is i40e_parse_rx_flow_user_data(9), straight out of the Kernel API Manual, and honestly? she's a little decoder ring and I'm obsessed. 🎀

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✨ NAME ✨

i40e_parse_rx_flow_user_data — deconstruct user-defined data 🧚

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🌸 SYNOPSIS 🌸

int i40e_parse_rx_flow_user_data (struct ethtool_rx_flow_spec *fsp ,
struct i40e_rx_flow_userdef *data );

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🦋 ARGUMENTS 🦋

• fsp — pointer to the rx flow specification, like, the whole vibe you're describing 🌈
• data — pointer to the userdef data structure where the goods get stored 💖

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👑 DESCRIPTION 👑

So the whole point: you read the user-defined data and deconstruct that value into a structure. That's it, that's the job.

And listen — no other code should read the user-defined data. Not one line. The whole reason is so that every place reads that value the same correct way, consistently. iykyk, consistency is the moment. ✨

The user-defined field is a 64bit Big Endian format value, and we deconstruct it by reading bits or bit fields out of it. The rules for that, periodt:

• single bit flags get defined starting from the highest bits 👑
• small bit field values get defined starting from the lowest bits 🍓

Then the returns, bestie, pay attention:

• returns 0 if the data is valid 🎉
• returns non-zero if the userdef data is invalid and the filter should be rejected 💀

🫶 careful with this one: the data structure will always be modified, even if FLOW_EXT is not set. no cap. 🙈

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🔥 SEE ALSO 🔥

it's giving tag list, honestly — there's a kernel file in here and then a whole friend group:

Kernel file ./drivers/net/ethernet/intel/i40e/i40e_ethtool.c struct, plus all of these icons:

• i40e_stats(9)
• i40e_add_one_ethtool_stat(9)
• __i40e_add_ethtool_stats(9)
• i40e_add_ethtool_stats(9)
• i40e_add_queue_stats(9)
• __i40e_add_stat_strings(9)
• i40e_add_stat_strings(9)
• i40e_partition_setting_complaint(9)
• i40e_phy_type_to_ethtool(9)
• i40e_get_settings_link_up_fec(9)
• i40e_get_settings_link_up(9)
• i40e_get_settings_link_down(9)
• i40e_get_link_ksettings(9)
• i40e_speed_to_link_speed(9)
• i40e_set_link_ksettings(9)
• i40e_get_pauseparam(9)
• i40e_set_pauseparam(9)
• i40e_get_stats_count(9)
• i40e_get_veb_tc_stats(9)
• i40e_get_pfc_stats(9)
• i40e_get_ethtool_stats(9)
• i40e_get_stat_strings(9)
• i40e_set_wol(9)
• __i40e_get_coalesce(9)
• i40e_get_coalesce(9)
• i40e_get_per_queue_coalesce(9)
• i40e_set_itr_per_queue(9)
• __i40e_set_coalesce(9)
• i40e_set_coalesce(9)
• i40e_set_per_queue_coalesce(9)
• i40e_check_mask(9)
• i40e_fill_rx_flow_user_data(9)
• i40e_get_ethtool_fdir_all(9)
• i40e_get_ethtool_fdir_entry(9)
• i40e_get_rx_ring_count(9)
• i40e_get_rxnfc(9)
• i40e_get_rss_hash_bits(9)
• i40e_update_ethtool_fdir_entry(9)
• i40e_prune_flex_pit_list(9)
• i40e_del_fdir_entry(9)
• i40e_unused_pit_index(9)
• i40e_find_flex_offset(9)
• i40e_add_flex_offset(9)
• __i40e_reprogram_flex_pit(9)
• i40e_reprogram_flex_pit(9)
• i40e_flow_str(9)
• i40e_pit_index_to_mask(9)
• i40e_print_input_set(9)
• i40e_check_fdir_input_set(9)
• i40e_match_fdir_filter(9)
• i40e_disallow_matching_filters(9)
• i40e_add_fdir_ethtool(9)
• i40e_set_rxnfc(9)
• i40e_max_channels(9)
• i40e_get_channels(9)
• i40e_set_channels(9)
• i40e_get_rxfh_key_size(9)
• i40e_get_rxfh_indir_size(9)
• i40e_get_rxfh(9)
• i40e_set_rxfh(9)
• i40e_get_priv_flags(9)
• i40e_set_priv_flags(9)
• i40e_get_module_info(9)
• i40e_get_module_eeprom(9)

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and that's the whole page, bestie!! 🦋💜 it lives over in ./drivers/net/ethernet/intel/i40e, dated October 2026, and it's i40e_parse_r...ow_user_data(9) all the way down. slay, go parse some bits, ily. 💅✨