Index: head/share/man/man4/ntb_transport.4 =================================================================== --- head/share/man/man4/ntb_transport.4 (revision 354596) +++ head/share/man/man4/ntb_transport.4 (revision 354597) @@ -1,114 +1,114 @@ .\" .\" Copyright (c) 2016-2019 Alexander Motin .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" $FreeBSD$ .\" .Dd November 9, 2019 .Dt NTB_TRANSPORT 4 .Os .Sh NAME .Nm ntb_transport .Nd Packet-oriented transport for Non-Transparent Bridges .Sh SYNOPSIS To compile this driver into your kernel, place the following lines in your kernel configuration file: .Bd -ragged -offset indent .Cd "device ntb" .Cd "device ntb_transport" .Ed .Pp Or, to load the driver as a module at boot, place the following line in .Xr loader.conf 5 : .Bd -literal -offset indent ntb_transport_load="YES" .Ed .Pp The following tunables are settable from the .Xr loader 8 : .Bl -ohang .It Va hw.ntb_transport.debug_level Driver debug level. The default value is 0, higher means more verbose. .It Va hw.ntb_transport.max_mw_size Limits maximum memory window usage. Allocation of big physically contiguous memory buffer may be a problem, while too big buffers makes no much sense for low latency network interface. .It Va hint.ntb_transport. Ns Ar X Ns Va .config Configures a set of the transport consumers, separated by commas. Each consumer can be configured as: "[][:]", where: .Va name is a name of the driver to attach (empty means any), .Va queues is a number of queues to allocate (empty means automatic). The default configuration is empty string, which means single consumer with one queue per memory window, allowing any driver to attach. .It Va hint.ntb_transport. Ns Ar X Ns Va .compact -Non-zero value enables compact version of sratchpad protocol, using twice -less registers. +Non-zero value enables compact version of scratchpad protocol, using half +as many registers. Enabled automatically if there is not enough registers to negotiate all available memory windows. The compact version does not support memory windows of 4GB and above. .El .Sh DESCRIPTION The .Nm driver attaches on top of the .Nm ntb driver to utilize its resources to create a set of bidirectional queues, delivering packets between the systems. The primary purpose of this driver is to be used by .Nm if_ntb network interface, but other consumers may also be developed using KPI. .Pp Each .Nm require from underlying .Nm ntb instance: .Bl -bullet -compact .It 1 or more memory windows; .It 6 scratchpads, plus 2 more for each additional memory window, or 3 plus 1 in case of compact protocol; .It 1 doorbell for each memory window or configured queue. .El .Sh SEE ALSO .Xr if_ntb 4 , .Xr ntb 4 , .Xr ntb_hw_amd 4 , .Xr ntb_hw_intel 4 , .Xr ntb_hw_plx 4 .Sh AUTHORS .An -nosplit The .Nm driver was developed by Intel and originally written by .An Carl Delsey Aq Mt carl@FreeBSD.org . Later improvements were done by .An Conrad E. Meyer Aq Mt cem@FreeBSD.org and .An Alexander Motin Aq Mt mav@FreeBSD.org .