libnvme(2)

💖 NAME 💖

bestie, meet struct nvme_primary_ctrl_cap — aka the Identify - Controller Capabilities Structure ✨ it's from the libnvme API manual and it lives in section 2. she's a struct, she's iconic, she's holding all the controller capability tea 👑

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🦋 SYNOPSIS 🦋

okay so here's the whole shape of her, no cap:

struct nvme_primary_ctrl_cap {
    __le16 cntlid;
    __le16 portid;
    __u8 crt;
    __u8 rsvd5[27];
    __le32 vqfrt;
    __le32 vqrfa;
    __le16 vqrfap;
    __le16 vqprt;
    __le16 vqfrsm;
    __le16 vqgran;
    __u8 rsvd48[16];
    __le32 vifrt;
    __le32 virfa;
    __le16 virfap;
    __le16 viprt;
    __le16 vifrsm;
    __le16 vigran;
    __u8 rsvd80[4016];
};

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🌸 Members 🌸

literally every single field, in order, zero skipped 💅

• cntlid — Controller Identifier 🪪
• portid — Port Identifier 🚪
• crt — Controller Resource Types 🧩
• rsvd5 — reserved 🙈 (don't touch her, she's just vibing there)
• vqfrt — VQ Resources Flexible Total 📊
• vqrfa — VQ Resources Flexible Assigned ✅
• vqrfap — VQ Resources Flexible Allocated to Primary 👑
• vqprt — VQ Resources Private Total 🔒
• vqfrsm — VQ Resources Flexible Secondary Maximum ⬆️
• vqgran — VQ Flexible Resource Preferred Granularity 🎚️
• rsvd48 — reserved 🙈 (again, just sitting there being mysterious)
• vifrt — VI Resources Flexible Total 📈
• virfa — VI Resources Flexible Assigned ✅
• virfap — VI Resources Flexible Allocated to Primary 👑
• viprt — VI Resources Private Total 🔒
• vifrsm — VI Resources Flexible Secondary Maximum ⬆️
• vigran — VI Flexible Resource Preferred Granularity 🎚️
• rsvd80 — reserved 🙈 (yes, another one — the reserved girlies said "we're staying")

not me pointing out that the rsvd5, rsvd48, and rsvd80 fields are all just padding doing absolutely nothing academically 📚✨ they keep the byte math honest so the real fields land in the right spots. respect the grind fr fr.

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and that's the whole page, bestie 🫶 this was struct nvme_primary_ctrl_cap from the libnvme API Manual, dated July 2026 — documented right here under libnvme(2). go forth and identify those controller capabilities, queen 💜🧚💖