lpfc_idiag_queacc_read(9)

💅 lpfc_idiag_queacc_read 💅

okay so real talk, this is a page out of the Kernel API Manual, bestie — section 9, kernel internals territory. No cap, it's niche but it's iconic.

---

🌸 NAME 🌸

lpfc_idiag_queacc_read — the idiag debugfs read for a port queue, literally that's the whole gig 💖

---

✨ SYNOPSIS ✨

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

---

🎀 ARGUMENTS 🎀

• file — the file pointer you're reading from. your entry point, your main character 🫶
• buf — the buffer the data gets copied into. it's where the tea lands 💅
• nbytes — how many bytes you're asking for.
• ppos — where in the file the read starts from. the vibe check of "where were we" ⭐

---

🦋 DESCRIPTION 🦋

So this routine reads data out of the phba device queue memory — following whatever the idiag command says — and copies it over to the user buf. 📥

And depending on how the queue dump read command got set up, it does one of two things:

• a single queue entry read, or
• browsing through all the entries of the queue 🌈

like, it's giving "one lil peek" vs "full scroll," iykyk.

---

🔥 RETURN 🔥

This function returns the amount of data that was actually read — and lowkey important: that can be less than nbytes if it hit the end of the file 😭 — or a negative error value if things went sideways. keep an eye on it, fr fr.

---

👑 SEE ALSO 👑

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

• lpfc_debugfs_disc_trc_data(9)
• lpfc_debugfs_slow_ring_trc_data(9)
• lpfc_debugfs_hbqinfo_data(9)
• lpfc_debugfs_commonxripools_data(9)
• lpfc_debugfs_multixripools_data(9)
• lpfc_debugfs_lockstat_data(9)
• lpfc_debugfs_dumpHBASlim_data(9)
• lpfc_debugfs_dumpHostSlim_data(9)
• lpfc_debugfs_nodelist_data(9)
• lpfc_debugfs_nvmestat_data(9)
• lpfc_debugfs_scsistat_data(9)
• lpfc_debugfs_ioktime_data(9)
• lpfc_debugfs_nvmeio_trc_data(9)
• lpfc_debugfs_hdwqstat_data(9)
• lpfc_debugfs_disc_trc(9)
• lpfc_debugfs_slow_ring_trc(9)
• lpfc_debugfs_nvme_trc(9)
• lpfc_debugfs_disc_trc_open(9)
• lpfc_debugfs_slow_ring_trc_open(9)
• lpfc_debugfs_hbqinfo_open(9)
• lpfc_debugfs_multixripools_open(9)
• lpfc_debugfs_lockstat_open(9)
• lpfc_debugfs_ras_log_open(9)
• lpfc_debugfs_dumpHBASlim_open(9)
• lpfc_debugfs_dumpHostSlim_open(9)
• lpfc_debugfs_nodelist_open(9)
• lpfc_debugfs_lseek(9)
• lpfc_debugfs_read(9)
• lpfc_debugfs_release(9)
• lpfc_debugfs_multixripools_write(9)
• lpfc_idiag_cmd_get(9)
• lpfc_idiag_open(9)
• lpfc_idiag_release(9)
• lpfc_idiag_cmd_release(9)
• lpfc_idiag_pcicfg_read(9)
• lpfc_idiag_pcicfg_write(9)
• lpfc_idiag_baracc_read(9)
• lpfc_idiag_baracc_write(9)
• lpfc_idiag_queinfo_read(9)
• lpfc_idiag_que_param_check(9)
• lpfc_idiag_queacc_read_qe(9)
• lpfc_idiag_queacc_write(9)
• lpfc_idiag_drbacc_read_reg(9)
• lpfc_idiag_drbacc_read(9)
• lpfc_idiag_drbacc_write(9)
• lpfc_idiag_ctlacc_read_reg(9)
• lpfc_idiag_ctlacc_read(9)
• lpfc_idiag_ctlacc_write(9)
• lpfc_idiag_mbxacc_get_setup(9)
• lpfc_idiag_mbxacc_read(9)
• lpfc_idiag_mbxacc_write(9)
• lpfc_idiag_extacc_avail_get(9)
• lpfc_idiag_extacc_alloc_get(9)
• lpfc_idiag_extacc_drivr_get(9)
• lpfc_idiag_extacc_write(9)
• lpfc_idiag_extacc_read(9)
• lpfc_debugfs_initialize(9)
• lpfc_debugfs_terminate(9)
• lpfc_debug_dump_all_queues(9)

---

and that's the whole page, bestie 💖✨🎀🦋🌸💅🫶

oh and the lil sign-off: this one lives in ./drivers/scsi/lpfc, dated October 2026, and it's filed under lpfc_idiag_queacc_read(9) — periodt 💜