lpfc_idiag_queinfo_read(9)

📦 version 7.3.1, in nixpkgs unstable

💅 lpfc_idiag_queinfo_read(9) — the kernel API manual page, bestie edition

okay so this is lpfc_idiag_queinfo_read, from the Kernel API Manual ✨ — and before u ask, yes it's a real kernel function and yes it's lowkey iconic. it lives in ./drivers/scsi/lpfc and the manual's dated October 2026 (we'll get to that at the end 🎀).

🌸 NAME 🌸

lpfc_idiag_queinfo_read — idiag debugfs read queue information. that's it, that's the name. she reads queue info through debugfs. periodt 💅

✨ SYNOPSIS ✨

ssize_t lpfc_idiag_queinfo_read (struct file *file , char __user *buf ,
size_t nbytes , loff_t *ppos );

she returns an ssize_t, she takes four args, she's booked and busy 💖

🫶 ARGUMENTS 🫶

  • file — the file pointer to read from. like, the actual file ur grabbing data out of 📂
  • buf — the buffer to copy the data to. this is where the info lands, no cap
  • nbytes — the number of bytes to read. the size limit, the boundary, the "how much can u take" 🧚
  • ppos — the position in the file to start reading from. where u're at in the file, bestie 📍

🌈 DESCRIPTION 🌈

so what does she actually do? this routine reads data from the phba SLI4 PCI function queue information, and copies it to the user buf. slay 💅

here's the main character plot twist tho: this routine only returns 1 EQs worth of information. just one. that's her whole thing. she remembers the last EQ she read and jumps to the next EQ on the next call 🔥 so basically, subsequent calls to queInfo will retrieve all EQs allocated for the phba. it's giving "one sip at a time" energy and honestly? we respect it 🍓

👑 RETURN 👑

this function returns the amount of data that was read — and bestie, note that this could be less than nbytes if the end of the file was reached — or a negative error value if things went sideways 😭

🦋 SEE ALSO 🦋

first up, the source itself:

  • Kernel file ./drivers/scsi/lpfc/lpfc_debugfs.c

and now the whole friend group, the entire group chat, no one gets left out 💜:

like, fifty-nine of them. she said "bring the whole squad" 😭🫶

and that's the page, bestie!! this one's stamped from ./drivers/scsi/lpfc, dated October 2026 — mwah, we love a timestamped queen 💅✨🎀

📦 where this page comes from