NTB(4) FreeBSD Kernel Interfaces Manual NTB(4)
NAME
ntb - Non-Transparent Bridge subsystem
SYNOPSIS
To compile it into your kernel, place the following lines in your kernel
configuration file:
device ntb
Or, to load it as a module at boot, place the following line in
loader.conf(5):
ntb_load="YES"
The following tunables are settable from the loader(8):
hw.ntb.debug_level
Driver debug level. The default value is 0, higher means more verbose.
hint.ntb_hw.X.config
Configures a set of NTB functions, separated by commas, and their
resource allocation. Each function can be configured as:
"[<name>][:<mw>[:<spad>[:<db>]]]", where: name is a name of the driver to
attach (empty means any), mw is a number of memory windows to allocate
(empty means all available), spad is a number of scratchpad registers to
allocate (empty means all available), db is a number of doorbells to
allocate (empty means all available). The default configuration is empty
string, which means single function with all available resources,
allowing any driver to attach.
DESCRIPTION
Non-Transparent Bridges connect two computer systems with PCIe link(s),
providing each of them limited access to others memory space, scratchpad
registers and interrupts. The ntb subsystem uses those resources
provided in generic way by hardware drivers and splits them between
several functions, according to specified configuration.
SEE ALSO
if_ntb(4), ntb_hw_amd(4), ntb_hw_intel(4), ntb_hw_plx(4),
ntb_transport(4)
AUTHORS
The ntb subsystem was developed by Intel and originally written by Carl
Delsey <
[email protected]>. Later improvements were done by Conrad E.
Meyer <
[email protected]> and Alexander Motin <
[email protected]>.
FreeBSD 14.1-RELEASE-p8 August 29, 2019 FreeBSD 14.1-RELEASE-p8