Provided by: freebsd-manpages_12.2-1_all
rtwn — Realtek IEEE 802.11 wireless network driver
options RTWN_DEBUG options RTWN_WITHOUT_UCODE To compile this driver into the kernel, place the following lines in your kernel configuration file: device rtwn device rtwnfw device rtwn_usb device rtwn_pci device wlan device firmware Alternatively, to load the driver as a module at boot time, place following lines in loader.conf(5): if_rtwn_pci_load="YES" if_rtwn_usb_load="YES"
The rtwn driver provides support for wireless network devices based on the Realtek RTL8192C, RTL8188E, RTL8192E, RTL8812A and RTL8821A programming APIs. These APIs are used by a wide variety of chips; most chips with USB and some with PCI interface are supported. To enable use for PCI/PCIe systems, see the rtwn_pci(4) driver; for USB devices, use the rtwn_usb(4) driver. The driver supports station, adhoc, hostap and monitor mode operation. There are no limitations for number of monitor mode virtual interfaces; in addition to any other virtual interface one station interface can be added (Note: RTL8821AU supports two non-monitor mode interfaces at the same time). All chips have hardware support for WEP, AES-CCM and TKIP encryption. The rtwn driver can be configured at runtime with ifconfig(8).
/usr/share/doc/legal/realtek.LICENSE rtwn firmware license The driver (if not compiled with options RTWN_WITHOUT_UCODE ) may use following firmware files, which are loaded when an interface is brought up: /boot/kernel/rtwn-rtl8188eefw.ko /boot/kernel/rtwn-rtl8188eufw.ko /boot/kernel/rtwn-rtl8192cfwE_B.ko /boot/kernel/rtwn-rtl8192cfwE.ko /boot/kernel/rtwn-rtl8192cfwT.ko /boot/kernel/rtwn-rtl8192cfwU.ko /boot/kernel/rtwn-rtl8192eufw.ko /boot/kernel/rtwn-rtl8812aufw.ko /boot/kernel/rtwn-rtl8821aufw.ko
Join an existing BSS network (i.e., connect to an access point): ifconfig wlan create wlandev rtwn0 inet 192.168.0.20 \ netmask 0xffffff00 Join a specific BSS network with network name “my_net”: ifconfig wlan create wlandev rtwn0 ssid my_net up Join a specific BSS network with 64-bit WEP encryption: ifconfig wlan create wlandev rtwn0 ssid my_net \ wepmode on wepkey 0x1234567890 weptxkey 1 up Create an IBSS network with 128-bit WEP encryption on the channel 4: ifconfig wlan create wlandev rtwn0 wlanmode adhoc ssid my_net \ wepmode on wepkey 0x01020304050607080910111213 weptxkey 1 \ channel 4 Join/create an 802.11b IBSS network with network name “my_net”: ifconfig wlan0 create wlandev rtwn0 wlanmode adhoc ifconfig wlan0 inet 192.168.0.22 netmask 0xffffff00 ssid my_net \ mode 11b Create a host-based access point: ifconfig wlan0 create wlandev rtwn0 wlanmode hostap ifconfig wlan0 inet 192.168.0.10 netmask 0xffffff00 ssid my_ap
Tunables can be set at the loader(8) prompt before booting the kernel or stored in loader.conf(5). dev.rtwn.%d.hwcrypto This tunable controls how key slots are assigned: 0 - disable h/w crypto support. Features that require access to frame contents (e.g., TCP/UDP/IP Rx checksum validation) will not work; 1 - use h/w crypto support for pairwise keys only; 2 - use h/w crypto support for all keys; may not work for multi-vap configurations. By default it is set to 1. dev.rtwn.%d.ratectl This tunable switches between rate control implementations: 0 - no rate control; 1 - driver sends 'tx complete' reports to net80211; algorithm is controlled via net80211; 2 - firmware-based rate control. By default it is set to 1; however driver may choose another algorithm in case if it is not implemented Currently selected algorithm is reported via dev.rtwn.%d.ratectl_selected read-only OID. dev.rtwn.%d.rx_buf_size (USB only) Controls size of temporary Rx buffer; smaller buffer size may increase number of interrupts.
rtwn%d: could not read efuse byte at address 0x%x rtwn%d: %s: cannot read rom, error %d There was an error while reading ROM; device attach will be aborted. This should not happen. rtwn%d: failed loadfirmware of file %s For some reason, the driver was unable to read the microcode file from the filesystem. The file might be missing or corrupted. The driver will disable firmware-dependent features. rtwn%d: wrong firmware size (%zu) rtwn%d: %s: failed to upload firmware %s (error %d) rtwn%d: timeout waiting for firmware readiness Firmware upload failed; the file might be corrupted. The driver will disable firmware-dependent features. This should not happen. rtwn%d: 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(4), netintro(4), rtwn_pci(4), rtwn_usb(4), rtwnfw(4), wlan(4), wlan_amrr(4), wlan_ccmp(4), wlan_tkip(4), wlan_wep(4), wlan_xauth(4), hostapd(8), ifconfig(8), wpa_supplicant(8)
The urtwn driver first appeared in OpenBSD 4.9 and FreeBSD 10.0; the rtwn driver first appeared in OpenBSD 5.8.
The rtwn driver was initially written by Stefan Sperling <email@example.com> and ported by Kevin Lo <firstname.lastname@example.org>. It was based on the urtwn driver written by Damien Bergamini <email@example.com>.
The rtwn driver currently does not implement firmware-based rate control.