1.\"- 2.\" Copyright (c) 2022-2024 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 September 30, 2024 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. 51.Pp 52This driver requires firmware to be loaded before it will work. 53The package 54.Pa wifi-firmware-rtw88-kmod 55from the 56.Pa ports/net/wifi-firmware-rtw88-kmod 57port needs to be installed before the driver is loaded. 58Otherwise no 59.Xr wlan 4 60interface can be created using 61.Xr ifconfig 8 . 62One can use 63.Xr fwget 8 64to install the correct firmware package. 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 HARDWARE 97The 98.Nm 99driver supports PCIe devices with the following chipsets: 100.Pp 101.Bl -tag -width Ds -offset indent -compact 102.It Realtek 802.11n wireless 8723de (RTL8723DE) 103.It Realtek 802.11ac wireless 8821ce (RTL8821CE) 104.It Realtek 802.11ac wireless 8822be (RTL8822BE) 105.It Realtek 802.11ac wireless 8822ce (RTL8822CE) 106.El 107.Sh BUGS 108Certainly. 109.Pp 110Does not seem to work (reliably) on machines with more than 4GB of 111main memory. 112See in the 113.Sx LOADER TUNABLES 114section above. 115.Sh SEE ALSO 116.Xr rtw88fw 4 , 117.Xr wlan 4 , 118.Xr fwget 8 , 119.Xr ifconfig 8 , 120.Xr wpa_supplicant 8 121.Sh HISTORY 122The 123.Nm 124driver first appeared in 125.Fx 13.2 . 126