lpfc_max_vpi_show(9)

🎀 NAME 🎀

Okay bestie, this is the kernel API manual page for lpfc_max_vpi_show(9), and it does exactly what it says on the tin: returns the maximum vpi. That's the whole vibe. ✨

💖 SYNOPSIS 💖

ssize_t lpfc_max_vpi_show (struct device *dev , struct device_attribute
       *attr , char *buf );

🦋 ARGUMENTS 🦋

• dev — the class device that is converted into a Scsi_host. Main character device energy.
• attr — the device attribute, not used. It's just there, chilling.
• buf — on return this contains the maximum vpi count in decimal, or "Unknown". Yes, with a capital U and quotes, periodt.

🌸 DESCRIPTION 🌸

So it calls lpfc_get_hba_info asking for just the mvpi count.

If lpfc_get_hba_info returns zero (failure), the buffer text is set to "Unknown", and the buffer length is returned. So the caller must check for "Unknown" in the buffer to detect a failure. Do not skip that check, bestie, it's literally the warning label. 😭

🫶 RETURN 🫶

It returns the size of the formatted string. That's it. Slay. 💅

👑 SEE ALSO 👑

The kernel file is ./drivers/scsi/lpfc/lpfc_attr.c, and the whole friend group is:

lpfc_jedec_to_ascii(9),
lpfc_drvr_version_show(9), lpfc_enable_fip_show(9), lpfc_info_show(9),
lpfc_serialnum_show(9), lpfc_temp_sensor_show(9),
lpfc_modeldesc_show(9), lpfc_modelname_show(9),
lpfc_programtype_show(9), lpfc_vportnum_show(9), lpfc_fwrev_show(9),
lpfc_hdw_show(9), lpfc_option_rom_version_show(9),
lpfc_link_state_show(9), lpfc_sli4_protocol_show(9),
lpfc_oas_supported_show(9), lpfc_link_state_store(9),
lpfc_num_discovered_ports_show(9), lpfc_issue_lip(9),
lpfc_do_offline(9), lpfc_reset_pci_bus(9), lpfc_selective_reset(9),
lpfc_issue_reset(9), lpfc_sli4_pdev_status_reg_wait(9),
lpfc_sli4_pdev_reg_request(9), lpfc_nport_evt_cnt_show(9),
lpfc_board_mode_show(9), lpfc_board_mode_store(9), lpfc_get_hba_info(9),
lpfc_max_rpi_show(9), lpfc_used_rpi_show(9), lpfc_max_xri_show(9),
lpfc_used_xri_show(9), lpfc_used_vpi_show(9), lpfc_npiv_info_show(9),
lpfc_poll_show(9), lpfc_poll_store(9), lpfc_sriov_hw_max_virtfn_show(9),
lpfc_enable_bbcr_set(9), lpfc_wwn_set(9), lpfc_oas_tgt_show(9),
lpfc_oas_tgt_store(9), lpfc_oas_priority_show(9),
lpfc_oas_priority_store(9), lpfc_oas_vpt_show(9), lpfc_oas_vpt_store(9),
lpfc_oas_lun_state_show(9), lpfc_oas_lun_state_store(9),
lpfc_oas_lun_status_show(9), lpfc_oas_lun_state_set(9),
lpfc_oas_lun_get_next(9), lpfc_oas_lun_state_change(9),
lpfc_oas_lun_show(9), lpfc_oas_lun_store(9), lpfc_nodev_tmo_show(9),
lpfc_nodev_tmo_init(9), lpfc_update_rport_devloss_tmo(9),
lpfc_nodev_tmo_set(9), lpfc_devloss_tmo_set(9),
lpfc_tgt_queue_depth_set(9), lpfc_restrict_login_init(9),
lpfc_restrict_login_set(9), lpfc_topology_store(9),
lpfc_static_vport_show(9), lpfc_link_speed_store(9),
lpfc_link_speed_init(9), lpfc_aer_support_store(9),
lpfc_aer_cleanup_state(9), lpfc_sriov_nr_virtfn_store(9),
lpfc_request_firmware_upgrade_store(9),
lpfc_request_firmware_upgrade_init(9), lpfc_force_rscn_store(9),
lpfc_force_rscn_init(9), lpfc_fcp_imax_store(9), lpfc_fcp_imax_init(9),
lpfc_cq_max_proc_limit_store(9), lpfc_cq_max_proc_limit_init(9),
lpfc_fcp_cpu_map_show(9), lpfc_fcp_cpu_map_store(9),
lpfc_fcp_cpu_map_init(9), lpfc_cpumask_irq_mode_init(9),
lpfc_irq_chann_show(9), lpfc_sg_seg_cnt_show(9),
lpfc_sg_seg_cnt_init(9), sysfs_ctlreg_write(9), sysfs_ctlreg_read(9),
sysfs_mbox_write(9), sysfs_mbox_read(9), lpfc_alloc_sysfs_attr(9),
lpfc_free_sysfs_attr(9), lpfc_get_host_symbolic_name(9),
lpfc_get_host_port_id(9), lpfc_get_host_port_type(9),
lpfc_get_host_port_state(9), lpfc_get_host_speed(9),
lpfc_get_host_fabric_name(9), lpfc_get_stats(9), lpfc_reset_stats(9),
lpfc_get_enc_info(9), lpfc_get_node_by_target(9),
lpfc_get_starget_port_id(9), lpfc_get_starget_node_name(9),
lpfc_get_starget_port_name(9), lpfc_set_rport_loss_tmo(9),
lpfc_set_vport_symbolic_name(9), lpfc_hba_log_verbose_init(9),
lpfc_get_hba_function_mode(9), lpfc_get_cfgparam(9),
lpfc_nvme_mod_param_dep(9), lpfc_get_vport_cfgparam(9)

Source/version: ./drivers/scsi/lpfc · date: October 2026 — mwah, stay sliving, kernel bestie 💋💖