1.\"- 2.\" Copyright (c) 2022 Bjoern A. Zeeb 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd April 22, 2023 28.Dt RTW88 4 29.Os 30.Sh NAME 31.Nm rtw88 32.Nd Realtek IEEE 802.11n/ac wireless network driver 33.Sh SYNOPSIS 34The driver will auto-load without any user interaction using 35.Xr devmatch 8 36if enabled in 37.Xr rc.conf 5 . 38.Pp 39Only if auto-loading is explicitly disabled, place the following 40lines in 41.Xr rc.conf 5 42to manually load the driver as a module at boot time: 43.Bd -literal -offset indent 44kld_list="${kld_list} if_rtw88" 45.Ed 46.Pp 47The driver should automatically load any 48.Xr rtw88fw 4 49firmware needed for the particular chipset. 50.Pp 51It is discouraged to load the driver from 52.Xr loader 8 . 53.Sh DESCRIPTION 54The 55.Nm 56driver is derived from Realtek's Linux rtw88 driver and provides support for 57the following chipsets: 58.Pp 59.Bl -tag -width Ds -offset indent -compact 60.It Realtek 802.11n wireless 8723de (RTL8723DE) 61.It Realtek 802.11ac wireless 8821ce (RTL8821CE) 62.It Realtek 802.11ac wireless 8822be (RTL8822BE) 63.It Realtek 802.11ac wireless 8822ce (RTL8822CE) 64.El 65.Pp 66The driver uses the 67.\" No LinuxKPI man pages so no .Xr here. 68.Em linuxkpi_wlan 69and 70.Em linuxkpi 71compat framework to bridge between the Linux and 72native 73.Fx 74driver code as well as to the native 75.Xr net80211 4 76wireless stack. 77.Pp 78While 79.Nm 80supports all 802.11 a/b/g/n and ac 81the compatibility code currently only supports 802.11 a/b/g modes. 82Support for 802.11 n/ac is to come. 83.Sh LOADER TUNABLES 84.Bl -tag -width indent 85.It Va compat.linuxkpi.skb.mem_limit 86If you are running a 64bit system with more than 4GB of main memory 87you need to set this tunable to 88.Sy 1 89in 90.Xr loader.conf 5 91and reboot once to make it effective. 92This tunable will work around a problem with DMA and limit allocations 93for network buffer memory to the lower 32bit of physical memory and 94make the driver work. 95.El 96.Sh BUGS 97Certainly. 98.Pp 99Does not seem to work (reliably) on machines with more than 4GB of 100main memory. 101See in the 102.Sx LOADER TUNABLES 103section above. 104.Sh SEE ALSO 105.Xr rtw88fw 4 , 106.Xr wlan 4 , 107.Xr ifconfig 8 , 108.Xr wpa_supplicant 8 109.Sh HISTORY 110The 111.Nm 112driver first appeared in 113.Fx 13.2 . 114