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NTB(4) Kernel Interfaces Manual NTB(4) NAME ntb -- Non-Transparent Bridge subsystem SYNOPSIS To compile it into your kernel, place the following lines in your ker- nel 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 allo- cate (empty means all available), spad is a number of scratchpad regis- ters to allocate (empty means all available), db is a number of door- bells to allocate (empty means all available). The default configura- tion 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, scratch- pad 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 <carl@FreeBSD.org>. Later improvements were done by Conrad E. Meyer <cem@FreeBSD.org> and Alexander Motin <mav@FreeBSD.org>. FreeBSD 13.2 August 29, 2019 NTB(4)
NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | AUTHORS
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