idpf_send_mb_msg(9)

📦 version 7.3.1, in nixpkgs unstable

✨ idpf_send_mb_msg ✨

okay so this is a page from the Kernel API Manual bestie, and it's literally the lore drop for idpf_send_mb_msg — the little function that slides a mailbox message over to the device control plane. the vibes are immaculate, the flags are detailed, let's get into it 💅

🌸 NAME 🌸

idpf_send_mb_msg — send mailbox message to the device control plane 🫶

🎀 SYNOPSIS 🎀

int idpf_send_mb_msg (struct idpf_adapter *adapter , struct
libie_ctlq_xn_send_params *xn_params , void *send_buf , size_t
send_buf_size );

🦋 ARGUMENTS 🦋

  • adapter — the driver specific private structure, aka the main character of this whole operation 👑
  • xn_params — the Xn send parameters that need filling in, she's an empty cup waiting for her moment
  • send_buf — the buffer you actually want to send, no cap
  • send_buf_size — how big that send buffer is, keep it honest 📏

💖 DESCRIPTION 💖

So what she does is: fill the Xn parameters with all the required info you need to send a virtchnl message. That's the whole assignment. ✨

And here's the slay part — the send buffer is DMA mapped in the libie, specifically so we don't have to memcpy it. efficiency icon behaviour honestly 🌈

She also handles cleanup duty: the mailbox queue entries of the previously sent message get cleaned up, unmapping and releasing the buffer. past-you's mess, tidied up. we love a responsible queen 🧹💜

🔥 RETURN 🔥

  • 0 — the request was successful, we ate and left no crumbs 💅
  • -EBUSY — a reset got detected, or the Tx control queue is full 😭 (she's booked and busy, try again later)
  • other negative error code — something went wrong, it's giving failure, check your vibes

🌟 SEE ALSO 🌟

the kernel file in question, for the curious: ./drivers/net/ethernet/intel/idpf/idpf_virtchnl.c

and the whole friend group, fr fr — go read these too:

and that's the page!! 🎀 she lives in ./drivers/net/ethernet/intel/idpf, dated October 2026 — go forth and send those mailbox messages, bestie, you're gonna do amazing 💖✨🦋

📦 where this page comes from