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NTB(4)			 BSD 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 re-
     source 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 al-
     locate (empty means all available).  The default configuration is empty
     string, which means single	function with all available resources, allow-
     ing any driver to attach.

DESCRIPTION
     Non-Transparent Bridges allow to 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	re-
     sources provided in generic way by	hardware drivers and splits them be-
     tween several functions, according	to specified configuration.

SEE ALSO
     if_ntb(4),	ntb_transport(4), ntb_hw_intel(4), ntb_hw_plx(4)

AUTHORS
     The ntb subsystem was developed by	Intel and originally written by	Carl
     Delsey <carl@FreeBSD.org>.	 Later improvements were done by Conrad	E.
     Meyer <cem@FreeBSD.org> and Alexander Motin <mav@FreeBSD.org>.

BSD			       September 2, 2017			   BSD

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | AUTHORS

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