txgbe_atr_compute_sig_hash(9)

💅 txgbe_atr_compute_sig_hash(9) — the Kernel API Manual, bestie edition 🎀

okay so this is a page from the Kernel API Manual, and the star of the show is txgbe_atr_compute_sig_hash — say that five times fast, i literally dare you 😭

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✨ NAME ✨

txgbe_atr_compute_sig_hash — literally just computes the signature hash. that's the whole gig. no cap. 💫

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🦋 SYNOPSIS 🦋

void txgbe_atr_compute_sig_hash (union txgbe_atr_hash_dword input ,
union txgbe_atr_hash_dword common , u32 *hash );

bestie look at her. void, so she doesn't even return anything — she just does the work and dips. main character energy fr fr 👑

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🌸 ARGUMENTS 🌸

• input — the input bitstream you're computing the hash on. that's the raw material, the vibe, the source material 💖
• common — the compressed common input dword. yes it's compressed, yes it's common, yes it's a dword. we love a triple threat ✨
• hash — a pointer to the computed hash. she doesn't hand you the answer, she points you at it. very mysterious of her 🫶

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🔥 DESCRIPTION 🔥

so this function is almost identical to the function above it — like, sisters, not twins, yk? 👯‍♀️ but she's got several optimizations baked in and honestly? obsessed.

the optimizations are, in order:

• unwinding all of the loops — no looping, we're just straight through it now 💅
• letting the compiler work out all of the conditional ifs — since the keys are static defines, the compiler can just figure it out itself. queen behavior, delegating like that 👑
• 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 icon ⭐

no notes. she ate. 🔥

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🌈 SEE ALSO 🌈

• the kernel file ./drivers/net/ethernet/wangxun/txgbe/txgbe_fdir.c — go read it, i believe in you 🧚
• txgbe_atr_compute_perfect_hash(9)
• txgbe_fdir_add_signature_filter(9)
• txgbe_fdir_enable(9)
• txgbe_init_fdir_signature(9)
• txgbe_init_fdir_perfect(9)

iykyk 💜

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ngl like half of these are basically her siblings, so if you liked this one go give them a read too 🍓

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and that's the page!! this came from ./drivers/net/ethernet/wangxun... and it's dated October 2026, and the whole thing is filed under txgbe_atr_compute_sig_hash(9). mwah, bye bestie 💖🎀🦋