libnvme(2)

💖 libnvme(2) — the API manual, bestie edition 💖

okay so before we even start: this is a page out of the libnvme manual, section 2 of the manual pages, k? It's the API manual. Grab a strawberry 🍓, sit down, and let's talk about one very specific little enum. It's giving "small but mighty."

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✨ NAME ✨

enum nvme_set_feat_event_layout — this field indicates the set feature event layout. That's it. That's the whole job. It's the layout of a set feature event, and the enum is here to tell you how to poke at it. 💅

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🌈 SYNOPSIS 🌈

enum nvme_set_feat_event_layout {
    NVME_SET_FEAT_EVENT_DW_COUNT_SHIFT ,
    NVME_SET_FEAT_EVENT_CC_DW0_SHIFT ,
    NVME_SET_FEAT_EVENT_MB_COUNT_SHIFT ,
    NVME_SET_FEAT_EVENT_DW_COUNT_MASK ,
    NVME_SET_FEAT_EVENT_CC_DW0_MASK ,
    NVME_SET_FEAT_EVENT_MB_COUNT_MASK

};

look at her. six members. absolutely no notes. 👑

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🎀 Constants 🎀

bestie, this is where it gets good. Each one of these is a shift or a mask that helps you pull one specific thing out of the struct nvme_set_feature_event.layout field. Like a little treasure hunt but the treasure is Dwords and memory buffer counts. 😭

• NVME_SET_FEAT_EVENT_DW_COUNT_SHIFT — the shift amount you use to get the Dword count out of the struct nvme_set_feature_event.layout field. Shift it, bestie. ✨
• NVME_SET_FEAT_EVENT_CC_DW0_SHIFT — the shift amount you use to get the logged command completion Dword 0 (yep, the logged one) out of the struct nvme_set_feature_event.layout field.
• NVME_SET_FEAT_EVENT_MB_COUNT_SHIFT — the shift amount you use to get the memory buffer count out of the struct nvme_set_feature_event.layout field. MB count girlies rise 🫶
• NVME_SET_FEAT_EVENT_DW_COUNT_MASK — the mask that gets you the Dword count from the struct nvme_set_feature_event.layout field. Mask on, slay.
• NVME_SET_FEAT_EVENT_CC_DW0_MASK — the mask that gets you the logged command completion Dword 0 from the struct nvme_set_feature_event.layout field.
• NVME_SET_FEAT_EVENT_MB_COUNT_MASK — the mask that gets you the memory buffer count from the struct nvme_set_feature_event.layout field.

ngl, the pattern here is chef's kiss iconic: three shifts, three masks, and every single one of them is reading out of the very same struct nvme_set_feature_event.layout field. no cap. 💀

So yeah — shifts to move the bits into place, masks to keep only the bits you want, all of it living inside struct nvme_set_feature_event.layout. That's the entire vibe check. 🌸

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and that's the whole page, bestie 🦋 tysm for reading. this was libnvme(2) (the API manual's section 2, as if you forgot 💜), dated July 2026. mwah, go shift some bits responsibly. 🎀✨💅