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download PDF document: cfumass.4.pdf

CFUMASS(4) FreeBSD Kernel Interfaces Manual CFUMASS(4)
NAME cfumass - USB device side support for Mass Storage Class Transport
SYNOPSIS This driver can be compiled into the kernel by placing these lines in the kernel configuration file:
device usb device usb_template device ctl device cfumass
The driver module can also be loaded at boot by adding this line to loader.conf(5):
cfumass_load="YES"
DESCRIPTION The cfumass driver provides device side support for emulating an USB mass storage device compliant with the USB Mass Storage Class Bulk-Only (BBB) Transport specification, implemented as a ctl(4) frontend driver.
To use cfumass:
o cfumass(4) must be loaded as a module or compiled into the kernel.
o The USB Mass Storage template must be chosen by setting the hw.usb.template sysctl to 0.
o The USB OTG port must be working in USB device-side mode. This happens automatically upon connection to a USB host.
o There must be a ctl(4) LUN configured for the cfumass port.
Upon loading, the driver creates a ctl(4) port named cfumass, presenting the first LUN mapped for that port - usually LUN 0 - to the USB host. See ctl.conf(5) and ctld(8) for details on configuring the LUN. See the cfumass_enable and cfumass_dir rc(8) variables in rc.conf(5) for an automated way to configure it at boot.
SYSCTL VARIABLES These variables are available as both sysctl(8) variables and loader(8) tunables:
hw.usb.cfumass.debug Verbosity level for log messages from the cfumass driver. Set to 0 to disable logging or 1 to warn about potential problems. Larger values enable debugging output. Defaults to 1.
hw.usb.cfumass.ignore_stop Ignore START STOP UNIT SCSI commands with START and LOEJ bits cleared. Some initiators send that command to stop the target when the user attempts to gracefully eject the drive, but fail to start it when the drive is reconnected. Set to 0 to handle the command in a standards-compliant way, 1 to ignore it and log a warning, or 2 to ignore it silently. Defaults to 1.

HISTORY The cfumass driver first appeared in FreeBSD 11.1.
AUTHORS The cfumass driver was developed by Edward Tomasz Napierala <trasz@FreeBSD.org> under sponsorship from the FreeBSD Foundation.
FreeBSD 14.0-RELEASE-p11 April 21, 2018 FreeBSD 14.0-RELEASE-p11