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Man Pages
RSU(4) FreeBSD Kernel Interfaces Manual RSU(4)

rsu
Realtek RTL8188SU/RTL8192SU USB IEEE 802.11b/g/n wireless network device

To compile this driver into the kernel, place the following lines in your kernel configuration file:
device ehci
device uhci
device ohci
device usb
device rsu
device rsufw
device wlan
Alternatively, to load the driver as a module at boot time, place the following lines in loader.conf(5):
if_rsu_load="YES" 
rsu-rtl8712fw_load="YES"

The rsu driver supports USB 2.0 wireless network devices based on Realtek RTL8188SU, RTL8191SU and RTL8192SU chipsets.
The RTL8188SU is a highly integrated 802.11n adapter that combines a MAC, a 1T1R capable baseband and an RF in a single chip. It operates in the 2GHz spectrum only.
The RTL8191SU is a highly integrated multiple-in, single-out (MISO) 802.11n adapter that combines a MAC, a 1T2R capable baseband and an RF in a single chip. It operates in the 2GHz spectrum only.
The RTL8192SU is a highly integrated multiple-in, multiple-out (MIMO) 802.11n adapter that combines a MAC, a 2T2R capable baseband and an RF in a single chip. It operates in the 2GHz spectrum only.
These are the modes the rsu driver can operate in:
BSS mode
Also known as infrastructure mode, this is used when associating with an access point, through which all traffic passes. This mode is the default.
monitor mode
In this mode the driver is able to receive packets without associating with an access point. This disables the internal receive filter and enables the card to capture packets from networks which it wouldn't normally have access to, or to scan for access points.
The rsu driver can be configured to use Wired Equivalent Privacy (WEP) or Wi-Fi Protected Access (WPA-PSK and WPA2-PSK). WPA is the de facto encryption standard for wireless networks. It is strongly recommended that WEP not be used as the sole mechanism to secure wireless communication, due to serious weaknesses in it.
The rsu driver can be configured at runtime with ifconfig(8).

/usr/share/doc/legal/realtek.LICENSE
rsu firmware license
The driver needs at least version 1.2 of the following firmware file, which is loaded when an interface is attached:
/boot/kernel/rsu-rtl8712fw.ko
 

The rsu driver provices support for Realtek RTL8188SU/RTL8192SU USB IEEE 802.11b/g/n wireless network adapters, including:
ASUS USB-N10
 
Belkin F7D1101 v1
 
D-Link DWA-131 A1
 
EDUP EP-MS150N(W)
 
Edimax EW-7622UMN
 
Hercules HWGUn-54
 
Hercules HWNUm-300
 
Planex GW-USNano
 
Sitecom WL-349 v1
 
Sitecom WL-353
 
Sweex LW154
 
TRENDnet TEW-646UBH
 
TRENDnet TEW-648UB
 
TRENDnet TEW-649UB
 

Join an existing BSS network (i.e., connect to an access point):
ifconfig wlan create wlandev rsu0 inet 192.168.0.20 \ 
    netmask 0xffffff00
Join a specific BSS network with network name “my_net”:
ifconfig wlan create wlandev rsu0 ssid my_net up
Join a specific BSS network with 64-bit WEP encryption:
ifconfig wlan create wlandev rsu0 ssid my_net \ 
        wepmode on wepkey 0x1234567890 weptxkey 1 up

%s: failed load firmware of file rsu-rtl8712fw
For some reason, the driver was unable to read the microcode file from the filesystem. The file might be missing or corrupted.
device timeout
A frame dispatched to the hardware for transmission did not complete in time. The driver will reset the hardware. This should not happen.

intro(1), netintro(4), rsufw(4), usb(4), wlan(4), arp(8), hostapd(8), ifconfig(8), wpa_supplicant(8)

The rsu driver first appeared in OpenBSD 4.9 and FreeBSD 10.0.

The rsu driver was written by Damien Bergamini <damien@openbsd.org> and ported by Rui Paulo <rpaulo@freebsd.org>. The 802.11n support was added by Adrian Chadd <adrian@freebsd.org>.

The rsu driver currently does not support 802.11n transmit aggregation, either A-MSDU or A-MPDU.
The rsu driver does not capture management frames in non-monitor modes; without this limitation some firmware functions (e.g., 'join bss') will not work properly.
April 4, 2018 FreeBSD 12.0-RELEASE

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