dpaa2_io_ser..._multiple_fq(9)

📦 version 7.3.1, in nixpkgs unstable

🦋 NAME 🦋

okay bestie, so this is dpaa2_io_service_enqueue_multiple_fq(9) from the Kernel API Manual — yes that's the whole giant name, the kernel really said "let's make it a paragraph" 💀 — and what it does is: enqueue multiple frames to a frame queue using one fqid. One fqid, many frames, maximum efficiency, she's giving batch processing main character energy ✨

🎀 SYNOPSIS 🎀

int dpaa2_io_service_enqueue_multiple_fq (struct dpaa2_io *d , u32 fqid , const struct dpaa2_fd *fd , int nb );

that's the whole signature, no cap. four things go in, one int comes out 🫶

💖 ARGUMENTS 💖

okay so here's what you're feeding her, one by one:

  • d — the given DPIO service. like, the actual service object you're working with. this is the main character of the call tbh 👑
  • fqid — the given frame queue id. it's a u32, it's the queue you're aiming at, and it's the one fqid for the whole batch (that's literally the whole point, iykyk 💅)
  • fd — the frame descriptor which is enqueued. it's const struct dpaa2_fd *, so you're passing a pointer and being very polite about not mutating it ✨
  • nb — number of frames to be enqueud. yeah, the original page says "enqueud" — we're keeping that, it's iconic, don't @ me 🙈 it's an int, it's how many frames you're pushing through

✨ DESCRIPTION ✨

so what does it actually return, because that's the vibe check that matters:

  • 0 — slay, the enqueue worked, everything is fine, go off 🎉
  • -EBUSY — the enqueue ring is not ready 😭 she's busy, she's not taking new frames right now, try again later
  • -ENODEV — there is no dpio service 💀 like genuinely none, no device, nothing to talk to

that's it, that's the whole contract. no hidden lore, no surprise fourth return value. periodt 💅

🌈 SEE ALSO 🌈

the source lives in this kernel file, go read it if you want the full behind-the-scenes:

  • ./drivers/soc/fsl/dpio/dpio-service.c

and here's the whole friend group, all the sibling functions in (9) form — say hi to all of them, there are a lot:

🍓 little reminder: this page came out of ./drivers/soc/fsl/dpio — that's the directory it calls home, and that's the version tag on the tin.

and that's the whole page bestie, mwah 💋 — brought to you by the ./drivers/soc/fsl/dpio crew, dated October 2026, still out here documenting kernel functions with a (9) in the title like an absolute icon 🧚‍♀️💜

📦 where this page comes from