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.Dd October 06, 2023 26.Dt RTW88 4 27.Os 28.Sh NAME 29.Nm rtw88 30.Nd Realtek IEEE 802.11n/ac wireless network driver 31.Sh SYNOPSIS 32The driver will auto-load without any user interaction using 33.Xr devmatch 8 34if enabled in 35.Xr rc.conf 5 . 36.Pp 37Only if auto-loading is explicitly disabled, place the following 38lines in 39.Xr rc.conf 5 40to manually load the driver as a module at boot time: 41.Bd -literal -offset indent 42kld_list="${kld_list} if_rtw88" 43.Ed 44.Pp 45It is discouraged to load the driver from 46.Xr loader 8 . 47.Sh DESCRIPTION 48The 49.Nm 50driver is derived from Realtek's Linux rtw88 driver and provides support for 51the following chipsets: 52.Pp 53.Bl -tag -width Ds -offset indent -compact 54.It Realtek 802.11n wireless 8723de (RTL8723DE) 55.It Realtek 802.11ac wireless 8821ce (RTL8821CE) 56.It Realtek 802.11ac wireless 8822be (RTL8822BE) 57.It Realtek 802.11ac wireless 8822ce (RTL8822CE) 58.El 59.Pp 60This driver requires firmware to be loaded before it will work. 61The package 62.Pa wifi-firmware-rtw88-kmod 63from the 64.Pa ports/net/wifi-firmware-rtw88-kmod 65port needs to be installed before the driver is loaded. 66Otherwise no 67.Xr wlan 4 68interface can be created using 69.Xr ifconfig 8 . 70One can use 71.Xr fwget 8 72to install the correct firmware package. 73.Pp 74The driver uses the 75.\" No LinuxKPI man pages so no .Xr here. 76.Em linuxkpi_wlan 77and 78.Em linuxkpi 79compat framework to bridge between the Linux and 80native 81.Fx 82driver code as well as to the native 83.Xr net80211 4 84wireless stack. 85.Pp 86While 87.Nm 88supports all 802.11 a/b/g/n and ac 89the compatibility code currently only supports 802.11 a/b/g modes. 90Support for 802.11 n/ac is to come. 91.Sh LOADER TUNABLES 92.Bl -tag -width indent 93.It Va compat.linuxkpi.skb.mem_limit 94If you are running a 64bit system with more than 4GB of main memory 95you need to set this tunable to 96.Sy 1 97in 98.Xr loader.conf 5 99and reboot once to make it effective. 100This tunable will work around a problem with DMA and limit allocations 101for network buffer memory to the lower 32bit of physical memory and 102make the driver work. 103.El 104.Sh BUGS 105Certainly. 106.Pp 107Does not seem to work (reliably) on machines with more than 4GB of 108main memory. 109See in the 110.Sx LOADER TUNABLES 111section above. 112.Sh SEE ALSO 113.Xr rtw88fw 4 , 114.Xr wlan 4 , 115.Xr fwget 8 , 116.Xr ifconfig 8 , 117.Xr wpa_supplicant 8 118.Sh HISTORY 119The 120.Nm 121driver first appeared in 122.Fx 13.2 . 123