lpfc_idiag_drbacc_read_reg(9)

📦 version 7.3.1, in nixpkgs unstable

💅 lpfc_idiag_drbacc_read_reg — the Kernel API Manual moment

okay so bestie, this one's a kernel-API manpage (lpfc_idiag_drbacc_read_reg, section 9) and honestly it's short and sweet — a lil debugfs helper that goes and reads one doorbell register and hands the bytes back to you. let's get into it 💖

✨ NAME ✨

lpfc_idiag_drbacc_read_reg — the idiag debugfs thing that reads a doorbell register. that's it, that's the whole vibe 🎀

🌸 SYNOPSIS 🌸

int lpfc_idiag_drbacc_read_reg (struct lpfc_hba *phba , char *pbuffer ,
       int len , uint32_t drbregid );

four args, one int coming back, no cap ✨

🦋 ARGUMENTS 🦋

  • phba — the pointer to the hba structure. yup, the whole HBA, main character energy 👑
  • pbuffer — the pointer to the buffer you're copying the data into. this is where the good stuff lands 🫶
  • len — the length of bytes to copied. literally how many bytes we're moving 📏
  • drbregid — the id to doorbell registers. you tell it which doorbell, it goes and rings it 🔔

💜 DESCRIPTION 💜

so what does this routine actually do? it reads a doorbell register, then copies its content over to the user buffer that pbuffer is pointing at. that's the whole plot, and honestly? it ate 🔥

⭐ RETURN ⭐

this function returns the amount of data that was copied into pbuffer. so like, if you were wondering how much actually made it in — that's your answer, bestie 💀

🌈 SEE ALSO 🌈

kernel file ./drivers/scsi/lpfc/lpfc_debugfs.c 👀

and then the whole extended friend group, fr fr:

ngl bestie, that's a lot of cross-references — every single one of them is in there tho, i checked, icon behavior 💅

🧚 sign-off 🧚

this lil beauty lives in ./drivers/scsi/lpfc, dated October 2026, and it's filed under the Kernel API Manual, section 9. go read a doorbell, kings 👑💖 periodt ✨

📦 where this page comes from