mpt_register(9)

📦 version 7.3.1, in nixpkgs unstable

💖 mpt_register(9) 💖

okay so first things first, bestie: this is a page from the Kernel API Manual, and the star of the show is mpt_register — the little glue function that says "hey, driver, tell me where to send your callbacks." 🎀

✨ NAME ✨

mpt_register — register your protocol-specific main callback handler, no cap.

✨ SYNOPSIS ✨

u8 mpt_register (MPT_CALLBACK cbfunc , MPT_DRIVER_CLASS dclass , char
*func_name );

🌸 ARGUMENTS 🌸

  • cbfunc — the callback function pointer. like, the actual address of the function you want called back. this is your main character. 👑
  • dclass — your protocol driver's class, which is a MPT_DRIVER_CLASS enum value. gotta tell the kernel who you are.
  • func_name — the name of the function you're calling. you know, for the vibes (and the records 📝).

🦋 DESCRIPTION 🦋

so here's the tea ☕ — this routine gets called by a protocol-specific driver (think: SCSI host, LAN, or SCSI target) to register its reply callback routine. and it's not optional, bestie. every protocol-specific driver must do this before it can use any IOC resources at all — like, including just obtaining request frames. no registration, no resources. periodt. 💅

⭐ NOTES ⭐

okay so the SCSI protocol driver is out here calling this routine three whole times to register separate callbacks, and honestly? iconic. 🙈 once for "normal" SCSI IO, once for MptScsiTaskMgmt requests, and once for Scan/DV requests. three callbacks, three vibes.

it returns a u8 valued "handle" in the range (and S.O.D. order) {N,...,7,6,5,...,1} if it works out. 🎉

⚠️ big warning bestie: if you get back MPT_MAX_PROTOCOL_DRIVERS — and yes, that includes zero! — the caller should consider that an error. do not pass go, do not collect $200. 💀

🔥 SEE ALSO 🔥

the kernel file ./drivers/message/fusion/mptbase.c, plus literally the entire extended universe of related calls:

and that's the whole page, bestie!! 🫶 this lil gem lives over in ./drivers/message/fusion, it's dated October 2026, and it answers to the name mpt_register(9). go forth and register those callbacks, you gorgeous kernel gremlin 💜✨

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