[PATCH 2/2] mt76: mt7915: add .set_bitrate_mask() callback

[Ryder Lee]

On Mon, 2021-04-26 at 11:41 -0700, Ben Greear wrote:
> On 4/26/21 9:29 AM, Ryder Lee wrote:
> > Add runtime configuration for bitrate mask. Note that GI cannot be setup.
> > 
> > Example:
> > iw dev wlan0 set bitrates vht-mcs-5 1:9 he-mcs-5 2:7
> > iw dev wlan0 set bitrates legacy-5 6 he-mcs-5 2:0-11
> 
> Is this only for data frames?  In other words, is it OK to
> set exactly one HE/VHT MCS rate and let mgt, bcast, mcast, still
> work OK at legacy rates?
> 
> Thanks,
> Ben
> 
Yes. And this's more like a 'limit', and it actually re-initializes
firmware rate control for each peer to add a boundry on top of rate
table. When you specify something like 'iw dev wlan0 set bitrates
vht-mcs-5 1:9', which means nss=1 mcs0-9 actually. If you would like
stick to a fixed rate then there's a knob in mt7915 debugfs.
As for other the mgmt, mcast, bcast should sill remain in low rate.