libnvme(9)

🎀 libnvme(9) 🎀

okay so this is straight out of the API Manual, and bestie, it's literally the whole page about enum nvme_cc — the enum that tells you all about the controller configuration 💅 no cap, that's what the NAME says, and I'm not gonna lie about it.

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🌸 NAME 🌸

enum nvme_cc — this field indicates the controller configuration. periodt.

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✨ SYNOPSIS ✨

here's the whole enum, copied exactly, every single member, don't skip a one:

enum nvme_cc {
    NVME_CC_EN_SHIFT ,
    NVME_CC_CSS_SHIFT ,
    NVME_CC_MPS_SHIFT ,
    NVME_CC_AMS_SHIFT ,
    NVME_CC_SHN_SHIFT ,
    NVME_CC_IOSQES_SHIFT ,
    NVME_CC_IOCQES_SHIFT ,
    NVME_CC_CRIME_SHIFT ,
    NVME_CC_EN_MASK ,
    NVME_CC_CSS_MASK ,
    NVME_CC_MPS_MASK ,
    NVME_CC_AMS_MASK ,
    NVME_CC_SHN_MASK ,
    NVME_CC_CRIME_MASK ,
    NVME_CC_IOSQES_MASK ,
    NVME_CC_IOCQES_MASK ,
    NVME_CC_CSS_NVM ,
    NVME_CC_CSS_CSI ,
    NVME_CC_CSS_ADMIN ,
    NVME_CC_AMS_RR ,
    NVME_CC_AMS_WRRU ,
    NVME_CC_AMS_VS ,
    NVME_CC_SHN_NONE ,
    NVME_CC_SHN_NORMAL ,
    NVME_CC_SHN_ABRUPT ,
    NVME_CC_CRWME ,
    NVME_CC_CRIME

};

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👑 Constants 👑

this is the part where every single one gets its lil moment. and yes, I'm giving you the descriptions exactly as the manual hands them over — I'm a good archivist, not a chaos gremlin 🙈

🦋 the shift amounts

• NVME_CC_EN_SHIFT — shift amount to get the enable ✨
• NVME_CC_CSS_SHIFT — shift amount to get the I/O command set selected
• NVME_CC_MPS_SHIFT — shift amount to get the memory page size
• NVME_CC_AMS_SHIFT — shift amount to get the arbitration mechanism selected
• NVME_CC_SHN_SHIFT — shift amount to get the shutdown notification
• NVME_CC_IOSQES_SHIFT — shift amount to get the I/O submission queue entry size
• NVME_CC_IOCQES_SHIFT — shift amount to get the I/O completion queue entry size
• NVME_CC_CRIME_SHIFT — shift amount to get the controller ready independent of media enable

💅 the masks

• NVME_CC_EN_MASK — mask to get the enable
• NVME_CC_CSS_MASK — mask to get the I/O command set selected
• NVME_CC_MPS_MASK — mask to get the memory page size
• NVME_CC_AMS_MASK — mask to get the arbitration mechanism selected
• NVME_CC_SHN_MASK — mask to get the shutdown notification
• NVME_CC_CRIME_MASK — mask to get the I/O submission queue entry size
• NVME_CC_IOSQES_MASK — mask to get the I/O completion queue entry size
• NVME_CC_IOCQES_MASK — mask to get the controller ready independent of media enable

bestie I am reading these straight off the page, character for character, no editing, no "fixing" — you want the manual, you get the manual, exactly as printed 🔥

🧚 the command sets

• NVME_CC_CSS_NVM — NVM command set
• NVME_CC_CSS_CSI — all supported I/O command sets
• NVME_CC_CSS_ADMIN — admin command set only

🌈 the arbitration mechanisms

• NVME_CC_AMS_RR — round robin
• NVME_CC_AMS_WRRU — weighted round robin with urgent priority class
• NVME_CC_AMS_VS — vendor specific

⭐ the shutdown notifications

• NVME_CC_SHN_NONE — no notification; no effect
• NVME_CC_SHN_NORMAL — normal shutdown notification
• NVME_CC_SHN_ABRUPT — abrupt shutdown notification

💖 the controller-ready ones

• NVME_CC_CRWME — controller ready with media enable
• NVME_CC_CRIME — controller ready independent of media enable

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and that's literally the whole vibe, bestie — 27 members, all accounted for, nothing dropped 🫶

signing off with the receipts: this was October 2026, the page is all about enum nvme_cc, and it lives in libnvme(9). go configure a controller, you icon 👑💜