MU Beamformee support?

[Martin-Éric Racine]

ti 6.5.2025 klo 19.24 Ming Kuang (ming at imkuang.com) kirjoitti:
>
> On Wed, 2025-04-30 at 17:42 +0300, Martin-Éric Racine wrote:
> > (non-subscriber; please keep me in CC)
> > Greetings,
> >
> > Having recently purchased an AC1300 dongle supported by the
> > rtw88_8822bu Linux driver, I ran into an unexpected VHT feature during
> > configuration.
> >
> > The relevant 'iw list' fragment:
> >
> > VHT Capabilities (0x03d071b2):
> >     Max MPDU length: 11454
> >     Supported Channel Width: neither 160 nor 80+80
> >     RX LDPC
> >     short GI (80 MHz)
> >     TX STBC
> >     SU Beamformee
> >     MU Beamformee
> >
> > The last line is what baffles me: The hostap.conf example in upstream
> > hostapd Git has an option for "MU Beamformer" but there is no mention
> > of "MU Beamformee" anywhere.
> >
> > Typo in the Linux rtw88 driver or missing configuration option in
> > hostapd?
>
> This is not a typo, but a normal specification noun.
>
> Usually, the transmitter is called a beamformer (most of the time it is
> an AP), and the receiver is called a beamformee (most of the time it is
> a STA).

I figured as much, since SU also exists as a former/formee pair. It's
just that hostapd.conf makes no mention of a formee for MU. I had to
make an educated guess:

vht_capab=[MAX-MPDU-11454][RXLDPC][SHORT-GI-80][TX-STBC][SU-BEAMFORMEE][MU-BEAMFORMEE][HTC-VHT]

Martin-Éric