crc64_nvme(9)

🎀 crc64_nvme — NAME 🎀

ok so this page lives in the Kernel API Manual, section 9, and it's literally all about crc64_nvme — aka Calculate CRC64-NVME 💖

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✨ SYNOPSIS ✨

u64 crc64_nvme (u64 crc , const void *p , size_t len );

that's the whole vibe: you hand it a u64 seed, a pointer, and a length, and it hands you back a u64. no cap. 🫶

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🌸 ARGUMENTS 🌸

• crc — the seed value for the computation, bestie. drop a 0 in here for a brand-new CRC calculation, or pass the previous crc64 value if you're computing incrementally (aka doing it in little chunks, main character energy). 🔥
• p — pointer to the buffer that the CRC64 gets run over. it's giving "here's my data, do your thing" 💅
• len — the length of buffer p. gotta tell it how far to go, we're not mind readers 🧚

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🦋 DESCRIPTION 🦋

okay so this one computes the CRC64 that's defined in the NVME NVM Command Set Specification, and the important part — the part you cannot miss — is that it does this including the bitwise inversion at the beginning and end 😭✨

like, both ends. beginning AND end. it's not optional, it's built in, it's the whole point. so don't go inverting anything yourself afterward, the function already ate and left no crumbs 👑

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💜 SEE ALSO 💜

• Kernel file ./include/linux/crc64.h — the header, the source of truth, the blueprint 💖
• crc64_be(9) — the other CRC64, its sibling, its costar 🌈

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ngl if you're doing incremental CRC you better remember to feed the previous crc64 value back in as crc, otherwise the vibe check fails 🫣

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⭐ that's a wrap, bestie! this iconic little page came to you from ./include/linux, dated October 2026, and yes it's crc64_nvme(9) — go forth and checksum responsibly 💅🎀🌸