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-.\"
-.\" Copyright (c) 2013 Intel Corporation
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions, and the following disclaimer,
-.\"    without modification.
-.\" 2. Redistributions in binary form must reproduce at minimum a disclaimer
-.\"    substantially similar to the "NO WARRANTY" disclaimer below
-.\"    ("Disclaimer") and any redistribution must be conditioned upon
-.\"    including a substantially similar Disclaimer requirement for further
-.\"    binary redistribution.
-.\"
-.\" NO WARRANTY
-.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-.\" "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-.\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
-.\" A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-.\" HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
-.\" IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-.\" POSSIBILITY OF SUCH DAMAGES.
-.\"
-.\" ntb driver man page.
-.\"
-.\" Author: Carl Delsey <carl@FreeBSD.org>
-.\"
-.\" $FreeBSD$
-.\"
-.Dd Apr 11, 2013
-.Dt NTB 4
-.Os
-.Sh NAME
-.Nm ntb ,
-.Nm ntb_hw ,
-.Nm if_ntb
-.Nd Intel(R) Non-Transparent Bridge driver
-.Sh SYNOPSIS
-To compile this driver into your kernel,
-place the following lines in your kernel configuration file:
-.Bd -ragged -offset indent
-.Cd "device ntb_hw"
-.Cd "device if_ntb"
-.Ed
-.Pp
-Or, to load the driver as a module at boot, place the following line in
-.Xr loader.conf 5 :
-.Bd -literal -offset indent
-if_ntb_load="YES"
-.Ed
-.Sh DESCRIPTION
-The
-.Nm
-driver provides support for the Non-Transparent Bridge (NTB) in the Intel S1200,
-Xeon E3 and Xeon E5 processor families.
-.Pp
-The NTB allows you to connect two computer systems using a PCI-e link if they
-have the correct equipment and connectors.
-.Sh CONFIGURATION
-The NTB memory windows need to be configured by the BIOS.
-If your BIOS allows you to set their size, you should set the size of both
-memory windows to 1 MiB.
-This needs to be done on both systems.
-.Pp
-Each system needs to have a different IP address assigned.
-The MAC address is randomly generated.
-Also for maximum performance, the MTU should be set to 16 kiB.
-This can be done by adding the line below to
-.Xr rc.conf 5 :
-.Bd -literal -offset indent
-ifconfig_ntb0="inet 192.168.1.10 netmask 255.255.255.0 mtu 16384"
-.Ed
-.Pp
-And on the second system :
-.Bd -literal -offset indent
-ifconfig_ntb0="inet 192.168.1.11 netmask 255.255.255.0 mtu 16384"
-.Ed
-.Pp
-If you are using the UDP protocol, you may want to increase the
-.Va net.inet.udp.maxdgram
-.Xr sysctl 8
-variable.
-.Sh SEE ALSO
-.Xr rc.conf 5 ,
-.Xr sysctl 8
-.Sh AUTHORS
-.An -nosplit
-The
-.Nm
-driver was developed by Intel and originally written by
-.An Carl Delsey Aq Mt carl@FreeBSD.org .
-.Sh BUGS
-If the driver is unloaded, it cannot be reloaded without a system reboot.
-.Pp
-The network support is limited.
-It isn't fully configurable yet.
-It also isn't integrated into
-.Xr netgraph 4
-or
-.Xr bpf 4 .
-.Pp
-NTB to Root Port mode is not yet supported.
-.Pp
-There is no way to protect your system from malicious behavior on the other
-system once the link is brought up.
-Anyone with root or kernel access on the other system can read or write to
-any location on your system.
-In other words, only connect two systems that completely trust each other.