Hi,

I am using a device based on the Atheros QCA9882 chipset.

I would like to make use of the simultaneous dual-band functionality
that the device provides. The goal is to have to interfaces with one
acting as
an Access Point (wlan0) and the other acting as a client of another AP
(wlan1). Ideally, both of these interfaces should be operating on
different channels.

As I have understood it, Atheros/Qualcomm market the QCA9882 as being
capable of both dual-band and concurrent operation:
https://www.qualcomm.com/news/releases/2012/02/23/qualcomm-atheros-launches-80211ac-product-ecosystem-provide-end-end-gigabit

I am using v4.1 of the Linux kernel.

Having experienced some difficulties using hostapd and wpa_supplicant,
I checked the device capabilities using iw. If I am interpreting the
output below correctly, it is only possible to use 1 channel on both
interfaces:

valid interface combinations:
                 * #{ managed, P2P-client } <= 36, #{ P2P-GO } <= 3,
#{ AP } <= 7, #{ IBSS } <= 1,
                   total <= 36, #channels <= 1, STA/AP BI must match


As I understand it, #channels <=1 indicates that only 1 channel may be
used at a particular time by all interfaces.

I am wondering if this is a limitation of the driver, or if there has
been a misunderstanding in the capabilities of the hardware.

Does anyone have experience with this?

Regards,

Fraser

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