lpfc_idiag_mbxacc_write(9)

💅 lpfc_idiag_mbxacc_write(9) — Kernel API Manual energy

okay so bestie, welcome to lpfc_idiag_mbxacc_write, straight out of the Kernel API Manual ✨ this one is a debugfs write handler for the lpfc driver, and it's giving "syntax police but make it kernel" 🎀

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✨ NAME ✨

lpfc_idiag_mbxacc_write — syntax check and set up idiag mbxacc commands 🦋

🌸 SYNOPSIS 🌸

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

🎀 ARGUMENTS 🎀

• file — the file pointer to read from. yes queen, that's your handle 👑
• buf — the buffer to copy the user data from. this is where the good stuff lives 🍓
• nbytes — the number of bytes to get. literally the byte count, no cap 💅
• ppos — the position in the file to start reading from. your little bookmark in the file 🌸

💖 DESCRIPTION 💖

So here's the vibe: this routine grabs the debugfs idiag command struct from user space, then does a syntax check for the driver mailbox command (dump) and sets up the necessary states in the idiag command struct accordingly. like, it's checking that your mbxacc command isn't messy before anything goes down 🔥

When it's successful, it returns the nbytes you passed in from debugfs user space. (the original manpage says nbytges and honestly? iconic typo, we stan, but it means nbytes 💀🫶)

And if things go sideways? In case of error conditions, it returns a proper error code back to the user space. no silent failures here, she tells you what's wrong 😭✨

ngl, this is the syntax-check gatekeeper for idiag mbxacc commands — nothing gets set up until she says it's valid 💅

👑 SEE ALSO 👑

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

and the whole friend group, in order, fr fr:

• 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_ctlacc_write(9)
• lpfc_idiag_mbxacc_get_setup(9), lpfc_idiag_mbxacc_read(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)

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and that's the whole page bestie, mwah 💋

so real quick, the sign-off tea ☕ — this little icon lives in ./drivers/scsi/lpfc, it's dated October 2026, and it answers to the name lpfc_idiag_mbxacc_write(9). go off, you gorgeous debugfs handler 🫶✨🎀