ixgbe_atr_co...g_hash_82599(9)

💖 ixgbe_atr_compute_sig_hash_82599(9) 💖

okay so real talk, bestie: this is a page from the Kernel API Manual and it's about one very specific little function in the ixgbe driver. the title up top got chopped by the manpage formatter so it shows as ixgbe_atr_co...g_hash_82599(9) — that's just the long name being too iconic for the header column, no cap. 🎀

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✨ NAME ✨

ixgbe_atr_compute_sig_hash_82599 — compute the signature hash. that's it. that's the whole vibe. 💅

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🌸 SYNOPSIS 🌸

u32 ixgbe_atr_compute_sig_hash_82599 (union ixgbe_atr_hash_dword input ,
union ixgbe_atr_hash_dword common );

it returns a u32, she takes two union ixgbe_atr_hash_dword args, and yes both of them are literally named input and common. slay. 🦋

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🧚 ARGUMENTS 🧚

• input — the input bitstream we're computing the hash on. this is the main character of the operation, fr fr. ⭐
• common — the compressed common input dword. yeah, it's a dword that's been compressed and also it's common. iykyk. 💜

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🔥 DESCRIPTION 🔥

so this function is almost identical to the function above it (the one right before this one in the source, bestie, keep up 💀) — but it's got several optimizations layered on top, and honestly? obsessed.

the optimizations are:

• unwinding all of the loops. no loops, no problem. 🌀
• letting the compiler work out all of the conditional ifs, since the keys are static defines — so the compiler does the thinking and we just vibe. 🧠✨
• computing two keys at once, because the hashed dword stream will be the same for both keys. why do it twice when you can do it once? efficiency queen behavior. 👑

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🌈 SEE ALSO 🌈

the kernel file lives at:

./drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c

and here's the whole friend group, in order, no one gets left out 🫶:

• prot_autoc_read_82599(9)
• prot_autoc_write_82599(9)
• ixgbe_init_phy_ops_82599(9)
• ixgbe_get_link_capabilities_82599(9)
• ixgbe_get_media_type_82599(9)
• ixgbe_stop_mac_link_on_d3_82599(9)
• ixgbe_start_mac_link_82599(9)
• ixgbe_disable_tx_laser_multispeed_fiber(9)
• ixgbe_enable_tx_laser_multispeed_fiber(9)
• ixgbe_flap_tx_laser_multispeed_fiber(9)
• ixgbe_set_hard_rate_select_speed(9)
• ixgbe_setup_mac_link_smartspeed(9)
• ixgbe_setup_mac_link_82599(9)
• ixgbe_setup_copper_link_82599(9)
• ixgbe_reset_hw_82599(9)
• ixgbe_fdir_check_cmd_complete(9)
• ixgbe_reinit_fdir_tables_82599(9)
• ixgbe_fdir_enable_82599(9)
• ixgbe_init_fdir_signature_82599(9)
• ixgbe_init_fdir_perfect_82599(9)
• ixgbe_fdir_add_signature_filter_82599(9)
• ixgbe_atr_compute_perfect_hash_82599(9)
• ixgbe_get_fdirtcpm_82599(9)
• ixgbe_read_analog_reg8_82599(9)
• ixgbe_write_analog_reg8_82599(9)
• ixgbe_start_hw_82599(9)
• ixgbe_identify_phy_82599(9)
• ixgbe_enable_rx_dma_82599(9)
• ixgbe_verify_fw_version_82599(9)
• ixgbe_verify_lesm_fw_enabled_82599(9)
• ixgbe_read_eeprom_buffer_82599(9)
• ixgbe_read_eeprom_82599(9)
• ixgbe_reset_pipeline_82599(9)
• ixgbe_read_i2c_byte_82599(9)
• ixgbe_write_i2c_byte_82599(9)

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💖 and that's the tea, bestie 💖

this little baddie comes to you from the source file ./drivers/net/ethernet/intel/i... (yep, the manpage footer truncated it too, we stay humble 🙈) and it's dated October 2026. go forth and hash those signatures. 🍓✨