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 April 22, 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 45The driver should automatically load any 46.Xr rtw88fw 4 47firmware needed for the particular chipset. 48.Pp 49It is discouraged to load the driver from 50.Xr loader 8 . 51.Sh DESCRIPTION 52The 53.Nm 54driver is derived from Realtek's Linux rtw88 driver and provides support for 55the following chipsets: 56.Pp 57.Bl -tag -width Ds -offset indent -compact 58.It Realtek 802.11n wireless 8723de (RTL8723DE) 59.It Realtek 802.11ac wireless 8821ce (RTL8821CE) 60.It Realtek 802.11ac wireless 8822be (RTL8822BE) 61.It Realtek 802.11ac wireless 8822ce (RTL8822CE) 62.El 63.Pp 64The driver uses the 65.\" No LinuxKPI man pages so no .Xr here. 66.Em linuxkpi_wlan 67and 68.Em linuxkpi 69compat framework to bridge between the Linux and 70native 71.Fx 72driver code as well as to the native 73.Xr net80211 4 74wireless stack. 75.Pp 76While 77.Nm 78supports all 802.11 a/b/g/n and ac 79the compatibility code currently only supports 802.11 a/b/g modes. 80Support for 802.11 n/ac is to come. 81.Sh LOADER TUNABLES 82.Bl -tag -width indent 83.It Va compat.linuxkpi.skb.mem_limit 84If you are running a 64bit system with more than 4GB of main memory 85you need to set this tunable to 86.Sy 1 87in 88.Xr loader.conf 5 89and reboot once to make it effective. 90This tunable will work around a problem with DMA and limit allocations 91for network buffer memory to the lower 32bit of physical memory and 92make the driver work. 93.El 94.Sh BUGS 95Certainly. 96.Pp 97Does not seem to work (reliably) on machines with more than 4GB of 98main memory. 99See in the 100.Sx LOADER TUNABLES 101section above. 102.Sh SEE ALSO 103.Xr rtw88fw 4 , 104.Xr wlan 4 , 105.Xr ifconfig 8 , 106.Xr wpa_supplicant 8 107.Sh HISTORY 108The 109.Nm 110driver first appeared in 111.Fx 13.2 . 112