ixgbe_get_fdirtcpm_82599(9)

💅 ixgbe_get_fdirtcpm_82599(9) — from the Kernel API Manual, bestie ✨

okay so this is a page out of the Kernel API Manual, and honestly? It's a little niche but it's lowkey iconic once you get it. We're talking ixgbe_get_fdirtcpm_82599 — the function whose whole entire personality is flipping bits so your TCP ports come out right. Stay with me, it's gonna slay 🎀

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✨ NAME ✨

ixgbe_get_fdirtcpm_82599 — generate a tcp port from atr_input_masks 🐝

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🌸 SYNOPSIS 🌸

u32 ixgbe_get_fdirtcpm_82599 (union ixgbe_atr_input *input_mask );

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🦋 ARGUMENTS 🦋

• input_mask — the mask that's getting bit swapped. That's it, that's the whole argument, she's got one job 💅

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🔥 DESCRIPTION 🔥

So here's the vibe: the source and destination port masks for flow director are bit swapped. And not in a cute way — we mean like, bit 15 effects bit 0, 14 effects 1, 13 effects 2, etc. 🫠 It's giving upside-down.

So if you want a value that's actually swapped correctly, you gotta bit swap the mask first — and that's literally exactly what this function does. No cap, that's the whole function. She bit swaps the mask and we love her for it 💖

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👑 SEE ALSO 👑

Kernel file ./drivers/net/ethernet/intel/ixgbe/ixgbe_82599.c — and honestly the whole 82599 friend group, they all show up:

• 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_atr_compute_sig_hash_82599(9)
• ixgbe_fdir_add_signature_filter_82599(9)
• ixgbe_atr_compute_perfect_hash_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 page, bestie 🌈 Sourced from ./drivers/net/ethernet/intel/i... (the path got a lil truncated, we don't gatekeep, it's in the ixgbe driver folder), dated October 2026, and the whole thing is filed under ixgbe_get_fdirtcpm_82599(9) — go forth and bit swap responsibly 🧚💜