5849e8f575
This driver supports both NTB-to-NTB and NTB-to-Root Port modes (though the second with predictable complications on hot-plug and reboot events). I tested it with PEX 8717 and PEX 8733 chips, but expect it should work with many other compatible ones too. It supports up to two NT bridges per chip, each of which can have up to 2 64-bit or 4 32-bit memory windows, 6 or 12 scratchpad registers and 16 doorbells. There are also 4 DMA engines in those chips, but they are not yet supported. While there, rename Intel NTB driver from generic ntb_hw(4) to more specific ntb_hw_intel(4), so now it is on par with this new ntb_hw_plx(4) driver and alike to Linux naming. MFC after: 2 weeks Sponsored by: iXsystems, Inc.
98 lines
3.9 KiB
Groff
98 lines
3.9 KiB
Groff
.\"
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.\" Copyright (c) 2016-2017 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 30, 2017
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.Dt NTB_HW_INTEL 4
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.Os
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.Sh NAME
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.Nm ntb_hw_intel
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.Nd Intel(R) Non-Transparent Bridge driver
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.Sh SYNOPSIS
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To compile this driver 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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.Cd "device ntb_hw_intel"
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.Ed
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.Pp
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Or, to load the driver 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_hw_intel_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm ntb_hw_intel
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driver provides support for the Non-Transparent Bridge (NTB) hardware in
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Intel Xeon E3/E5 and S1200 processor families, which allow one of their PCIe
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ports to be switched from transparent to non-transparent bridge mode.
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In this mode bridge looks not as a PCI bridge, but as PCI endpoint device.
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The driver hides hardware details, exposing memory windows, scratchpads
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and doorbells of the other side via hardware independent KPI to
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.Xr ntb 4
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subsystem.
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.Pp
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The hardware provides 2 or 3 memory windows to the other system's memory,
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16 scratchpad registers and 14 or 34 doorbells to interrupt the other system.
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On Xeon processors one of memory windows is typically consumed by the driver
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itself to workaround multiple hardware erratas.
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.Sh CONFIGURATION
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The NTB configuration should be set by BIOS.
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It includes enabling NTB, choosing between NTB-to-NTB (back-to-back) or
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NTB-to-Root Port mode,
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enabling split BAR mode (one of two 64-bit BARs can be split into two 32-bit
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ones) and configuring BAR sizes in bits (from 12 to 29/39) for both NTB sides.
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.Pp
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The recommended configuration is NTB-to-NTB mode, split bar is enabled and
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all BAR sizes are set to 20 (1 MiB).
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This needs to be done on both systems.
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.Sh SEE ALSO
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.Xr if_ntb 4 ,
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.Xr ntb_transport 4 ,
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.Xr ntb 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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driver 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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.Sh BUGS
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NTB-to-Root Port mode is not yet supported, but it doesn't look very useful.
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.Pp
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On Xeon v2/v3/v4 processors split BAR mode should be enabled to allow
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SB01BASE_LOCKUP errata workaround to be applied by the driver.
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.Pp
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There is no way to protect your system from malicious behavior on the other
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system once the link is brought up.
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Anyone with root or kernel access on the other system can read or write to
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any location on your system.
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In other words, only connect two systems that completely trust each other.
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