libnvme(9)

💅 NAME 💅

okay bestie, welcome to libnvme — the manual's literally called API Manual and this page is about one very specific lil guy: struct nvme_primary_ctrl_cap, aka the Identify - Controller Capabilities Structure. no cap, that's the whole name. 🫶

✨ SYNOPSIS ✨

here's the struct in all its glory, char-for-char, don't touch anything:

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];
 };

like, yes there are a LOT of fields. yes some of them are just vibes and reserved bytes. we love her anyway 💖

🎀 Members 🎀

okay so every single field, in order, no skips, let's go:

• cntlid — Controller Identifier 👑
• portid — Port Identifier 🌸
• crt — Controller Resource Types
• rsvd5 — reserved (it's giving "do not perceive her" energy 🙈)
• 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. mind your business bestie 💀)
• 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 (the final boss of reserved fields, 4016 bytes of pure "nothing to see here" 🌈)

lowkey obsessed with how the VQ block and the VI block are basically twins — same shape, different prefix. it's giving coordinated outfits. iykyk 💅

and that's the whole page bestie, you ate that 🍓

sign-off szn: this was the libnvme(9) page from the API Manual — libnvme(9), dated October 2026, all about struct nvme_primary_ctrl_cap. take care of her, she's iconic 👑✨🧚