fd784f7f60
Submitted by: Rajesh Kumar <rajesh1.kumar@amd.com> Reviewed by: bcr MFC after: 3 days Differential Revision: https://reviews.freebsd.org/D21462
93 lines
3.2 KiB
Groff
93 lines
3.2 KiB
Groff
.\"
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.\" Copyright (c) 2017 Alexander Motin <mav@FreeBSD.org>
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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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.\" 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 August 29, 2019
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.Dt NTB 4
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.Os
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.Sh NAME
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.Nm ntb
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.Nd Non-Transparent Bridge subsystem
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.Sh SYNOPSIS
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To compile it into your kernel,
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place the following lines in your kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device ntb"
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.Ed
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.Pp
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Or, to load it as a module at boot, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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ntb_load="YES"
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.Ed
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.Pp
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The following tunables are settable from the
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.Xr loader 8 :
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.Bl -ohang
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.It Va hw.ntb.debug_level
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Driver debug level.
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The default value is 0, higher means more verbose.
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.It Va hint.ntb_hw. Ns Ar X Ns Va .config
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Configures a set of NTB functions, separated by commas,
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and their resource allocation.
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Each function can be configured as: "[<name>][:<mw>[:<spad>[:<db>]]]", where:
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.Va name
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is a name of the driver to attach (empty means any),
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.Va mw
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is a number of memory windows to allocate (empty means all available),
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.Va spad
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is a number of scratchpad registers to allocate (empty means all available),
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.Va db
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is a number of doorbells to allocate (empty means all available).
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The default configuration is empty string, which means single function
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with all available resources, allowing any driver to attach.
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.El
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.Sh DESCRIPTION
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Non-Transparent Bridges connect two computer systems with PCIe
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link(s), providing each of them limited access to others memory space,
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scratchpad registers and interrupts.
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The
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.Nm
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subsystem uses those resources provided in generic way by hardware drivers
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and splits them between several functions, according to specified
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configuration.
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.Sh SEE ALSO
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.Xr if_ntb 4 ,
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.Xr ntb_hw_amd 4 ,
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.Xr ntb_hw_intel 4 ,
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.Xr ntb_hw_plx 4 ,
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.Xr ntb_transport 4
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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subsystem was developed by Intel and originally written by
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.An Carl Delsey Aq Mt carl@FreeBSD.org .
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Later improvements were done by
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.An Conrad E. Meyer Aq Mt cem@FreeBSD.org
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and
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.An Alexander Motin Aq Mt mav@FreeBSD.org .
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