137 lines
4.0 KiB
Groff
137 lines
4.0 KiB
Groff
.\" Copyright (c) 2017 The FreeBSD Foundation
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.\" All rights reserved.
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.\"
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.\" This software was developed by Edward Tomasz Napierala under sponsorship
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.\" from the FreeBSD Foundation.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.Dd April 9, 2018
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.Dt CFUMASS 4
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.Os
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.Sh NAME
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.Nm cfumass
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.Nd USB device side support for Mass Storage Class Transport
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.Sh SYNOPSIS
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This driver can be compiled into the kernel by placing these lines in
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the kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device usb"
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.Cd "device usb_template"
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.Cd "device ctl"
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.Cd "device cfumass"
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.Ed
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.Pp
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The driver module can also be loaded at boot by adding this line to
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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cfumass_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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driver provides device side support for emulating an USB mass storage
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device compliant with the USB Mass Storage Class Bulk-Only (BBB) Transport
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specification, implemented as a
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.Xr ctl 4
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frontend driver.
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.Pp
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To use
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.Nm :
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.Bl -bullet
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.It
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.Xr cfumass 4
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must be loaded as a module or compiled into the kernel.
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.It
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The USB Mass Storage template must be chosen by setting the
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.Va hw.usb.template
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sysctl to 0.
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.It
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The USB OTG port must be working in USB device-side mode.
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This happens automatically upon connection to a USB host.
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.It
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There must be a
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.Xr ctl 4
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LUN configured for the
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.Pa cfumass
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port.
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.El
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.Pp
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Upon loading, the driver creates a
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.Xr ctl 4
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port named
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.Pa cfumass ,
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presenting the first LUN mapped for that port - usually LUN 0 - to
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the USB host.
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See
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.Xr ctl.conf 5
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and
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.Xr ctld 8
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for details on configuring the LUN.
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.Sh SYSCTL VARIABLES
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These variables are available as both
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.Xr sysctl 8
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variables and
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.Xr loader 8
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tunables:
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.Bl -tag -width indent
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.It Va hw.usb.cfumass.debug
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Verbosity level for log messages from the
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.Nm
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driver.
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Set to 0 to disable logging or 1 to warn about potential problems.
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Larger values enable debugging output.
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Defaults to 1.
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.It Va hw.usb.cfumass.ignore_stop
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Ignore START STOP UNIT SCSI commands with START and LOEJ bits cleared.
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Some initiators send that command to stop the target when the user
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attempts to gracefully eject the drive, but fail to start it when the
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drive is reconnected.
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Set to 0 to handle the command in a standards-compliant way,
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1 to ignore it and log a warning, or 2 to ignore it silently.
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Defaults to 1.
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.It Va hw.usb.cfumass.max_lun
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Max LUN number to report to the initiator (USB host).
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Must be between 0 and 15.
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Some initiators incorrectly handle values larger than 0.
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Defaults to 0.
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.El
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.Sh SEE ALSO
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.Xr ctl 4 ,
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.Xr umass 4 ,
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.Xr usb 4 ,
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.Xr usb_template 4 ,
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.Xr ctl.conf 5 ,
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.Xr ctld 8
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Fx 11.1 .
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.Sh AUTHORS
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The
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.Nm
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driver was developed by
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.An Edward Tomasz Napierala Aq Mt trasz@FreeBSD.org
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under sponsorship from the FreeBSD Foundation.
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