802.11ax ER-SU (Extended Rates SU) Support#

To enable ER-SU (Extended Rates SU) support, use module parameters and debugfs. Accordingly, auto-rate table will be changed, as shown below.


config_er_su Value	Description	Auto Rate Table Change
0	Don't use ER-SU rates even though AP supports ER-SU transmissions	No change
1	Use ER-SU rates along with other non-ER SU rates if AP supports	Add ER-SU rate along with non ER-SU rates
2	Use only ER-SU rates in auto rate if AP supports	Add only ER-SU rate

Note:
Auto rate table should be updated to firmware on dynamic change from the user or from AP.
Fixed rate should also be configured based on config_er_su.
config_er_su=2 uses ER-SU rate and limits ER-SU rate to mcs2.
config_er_su=1 still uses non ER-SU rates.

Enabling ER-SU PPDU Transmission Support#

The driver can enable ER-SU PPDU transmission support through module param and update it dynamically through debugfs. Follow the steps below to enable ER-SU.

Compile the driver as described in the Compilation Steps section.
```
#make clean;make 
```

Navigate to the release folder and run the following commands to insert the driver.

# cd release
# insmod rsi_91x.ko driver_mode_value=1 rsi_zone_enabled=0x601 config_er_su=1/2
# insmod rsi_sdio.ko

To connect to the third access point (AP), run the following command:
```
# wpa_supplicant -i <interface_name> -D nl80211 -c <sta_settings.conf > -ddddt > log1 &
```
See the Configure Station using WPA Supplicant section for different options in wpa_supplicant.
To dynamically change the config_er_su value, use the command below after connection.
```
# echo 2 >/sys/kernel/debug/phyX/config_er_su
```
To check the config_er_su value, use the command below.
```
# cat /sys/kernel/debug/phyX/config_er_su
```
To use the fixed rate in ER-SU, follow the steps described in the Configuring the 802.11ax Wi-Fi Data Rate section.