lpfc_idiag_ctlacc_write(9)

okay bestie, welcome to lpfc_idiag_ctlacc_write(9) from the Kernel API Manual — aka the deep-cut debugfs function that gives your idiag ctlacc commands a whole syntax-check moment 💅✨

💖 NAME 💖

lpfc_idiag_ctlacc_write — syntax check and set up idiag ctlacc commands. Periodt 🎀

✨ SYNOPSIS ✨

The signature, character-for-character, no edits bestie:

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

🎀 ARGUMENTS 🎀

• file — the file pointer to read from. Yep, read from — that is literally what the page says, no notes 🙈
• buf — the buffer to copy the user data from.
• nbytes — the number of bytes to get.
• ppos — the position in the file to start reading from.

🦋 DESCRIPTION 🦋

So this routine is lowkey the vibe check for idiag ctlacc commands. It gets the debugfs idiag command struct from user space, then performs the syntax check for port and device control register read (dump) or write (set) command accordingly. Like, it is literally making sure the command has main character energy before letting it through 💅

When it is successful, it returns the nbytges passing in from debugfs user space. Yes, nbytges — keeping that exact spelling because details are sacred 😭✨ In case of error conditions, it returns the proper error code back to user space. No cap.

🌸 SEE ALSO 🌸

Kernel file ./drivers/scsi/lpfc/lpfc_debugfs.c — plus the whole squad of related calls, exact names, all of them, iykyk:

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_read(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_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)

xoxo from ./drivers/scsi/lpfc, October 2026 — your fav kernel bestie signing off with sparkle and zero skipped details 🫶🌈💜