libnvme(9)

💅 libnvme(9) — API Manual, bestie edition 🎀

okay so this page is from the libnvme API Manual (section 9, the kernel/API girlies) and it's all about one little enum, and honestly? she's lowkey iconic. it's the enum nvme_eom_optional_data_present page, aka the EOM Optional Data Present Fields moment. no cap, this is a niche one but we're gonna slay it together ✨

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✨ NAME ✨

enum nvme_eom_optional_data_present — the EOM Optional Data Present Fields, fr fr. that's the whole vibe. 🦋

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🌸 SYNOPSIS 🌸

here's the whole enum, bestie, laid out exactly as she comes:

enum nvme_eom_optional_data_present {
    NVME_EOM_ODP_PEFP_SHIFT ,
    NVME_EOM_ODP_EDFP_SHIFT ,
    NVME_EOM_ODP_RSVD_SHIFT ,
    NVME_EOM_ODP_PEFP_MASK ,
    NVME_EOM_ODP_EDFP_MASK ,
    NVME_EOM_ODP_RSVD_MASK

};

look at her. six little constants. main character energy from top to bottom 💜

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👑 Constants 👑

every single one of these bad girls is a helper for reading one specific field: .odp inside struct nvme_phy_rx_eom_log. some are shifts, some are masks, and all of them are pulling a different piece of the story out of that field. iykyk 🔥

• NVME_EOM_ODP_PEFP_SHIFT — the shift amount that gets you the printable eye field present value out of the struct nvme_phy_rx_eom_log.odp field. shift it, and the printable eye field present is like, right there. 💫
• NVME_EOM_ODP_EDFP_SHIFT — the shift amount that gets you the eye data field present value out of the struct nvme_phy_rx_eom_log.odp field. same energy, different field. 🫶
• NVME_EOM_ODP_RSVD_SHIFT — the shift amount that gets you the reserved optional data present value out of the struct nvme_phy_rx_eom_log.odp field. yes, "reserved optional data present" — that's the exact wording, don't @ me 🙈
• NVME_EOM_ODP_PEFP_MASK — the mask that gets you the printable eye field present value from the struct nvme_phy_rx_eom_log.odp field. masking era ✨
• NVME_EOM_ODP_EDFP_MASK — the mask that gets you the eye data field present value from the struct nvme_phy_rx_eom_log.odp field. another mask, another slay 💅
• NVME_EOM_ODP_RSVD_MASK — the mask that gets you the reserved data present value from the struct nvme_phy_rx_eom_log.odp field. (and yes, this one just says "reserved data present" while the shift one above says "reserved optional data present" — i noticed too, but that's literally what the page says, so we keep it exactly like that ⭐)

little reminder bestie: shifts and masks are two different moves — shifts get you the amount to shift by, masks get you the bits to mask with. both, always, out of that same .odp field in struct nvme_phy_rx_eom_log. 🧚

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and that's the whole page!! short and sweet, just how we like her. this was the libnvme(9) page for enum nvme_eom_optional_data_present, and it's dated October 2026, so mark your calendars and stan responsibly. mwah, ily, go read some .odp fields 💖🎀🦋🌸💅