1.\" 2.\" Copyright (c) 2016 Alexander Motin <mav@FreeBSD.org> 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.\" $FreeBSD$ 27.\" 28.Dd July 10, 2016 29.Dt NTB_TRANSPORT 4 30.Os 31.Sh NAME 32.Nm ntb_transport 33.Nd Packet-oriented transport for Non-Transparent Bridges 34.Sh SYNOPSIS 35To load the driver as a module at boot, place the following line in 36.Xr loader.conf 5 : 37.Bd -literal -offset indent 38ntb_transport_load="YES" 39.Ed 40.Pp 41The following tunables are settable from the 42.Xr loader 8 : 43.Bl -ohang 44.It Va hw.ntb_transport.debug_level 45Driver debug level. 46The default value is 0, higher means more verbose. 47.It Va hw.ntb_transport.max_num_clients 48Number of bidirectional queues to setup. 49The default value is 0, that means one queue per available memory window. 50Maximal number is limited by number of doorbells. 51.El 52.Sh DESCRIPTION 53The 54.Nm 55driver attaches on top of the 56.Nm ntb 57driver to utilize its resources to create set of bidirectional queues, 58delivering packets between the systems. 59The primary purpose of this is to be used by 60.Nm if_ntb 61network interface, but other consumers may also be developed using KPI. 62.Sh SEE ALSO 63.Xr if_ntb 4 , 64.Xr ntb_hw 4 65.Sh AUTHORS 66.An -nosplit 67The 68.Nm 69driver was developed by Intel and originally written by 70.An Carl Delsey Aq Mt carl@FreeBSD.org . 71Later improvements were done by 72.An Conrad E. Meyer Aq Mt cem@FreeBSD.org 73and 74.An Alexander Motin Aq Mt mav@FreeBSD.org . 75