88 lines
2.7 KiB
Groff
88 lines
2.7 KiB
Groff
.\" Copyright (c) 2017 Netflix, Inc
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.\" All rights reserved.
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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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.\"
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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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.\"
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.Dd December 20, 2017
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.Dt NDA 4
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.Os
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.Sh NAME
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.Nm nda
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.Nd NVMe Direct Access device driver
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.Sh SYNOPSIS
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.Cd device nvme
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.Cd device scbus
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for direct access devices, implementing the
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.Tn NVMe
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command protocol, that are attached to the system through a host adapter
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supported by the CAM subsystem.
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.Sh SYSCTL VARIABLES
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The following 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 12
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.It Va kern.cam.nda.sort_io_queue
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.Pp
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This variable determines whether the software queued entries are
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sorted in LBA order or not.
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Sorting is almost always a waste of time.
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The default is to not sort.
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.El
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.Pp
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The following report per-device settings, and are read-only unless
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otherwise indicated. Replace
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.Va N
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with the device unit number.
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.Bl -tag -width 12
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.It Va kern.cam.nda.N.rotating
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.Pp
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This variable reports whether the storage volume is spinning or
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flash.
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It's value is hard coded to 0 indicating flash.
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.It Va kern.cam.nda.N.unmapped_io
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This variable reports whether the
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.Nm
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driver accepts unmapped I/O for this unit.
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.Sh FILES
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.Bl -tag -width ".Pa /dev/nda*" -compact
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.It Pa /dev/nda*
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NVMe storage device nodes
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.El
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.Sh SEE ALSO
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.Xr nvme 4 ,
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.Xr nvd 4
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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 12.0 .
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.Sh AUTHORS
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.An Warner Losh Aq Mt imp@FreeBSD.org
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