Hi, > I have been poking at ath10k to get some CSI reporting working. > The CSI reports are a bit over 2k bytes in length, and they could > happen quite often. As far as I can tell, there is no good way in > the kernel to make this available. > > I was thinking maybe a callback into the mac80211 stack, which would > then send a netlink event might be a useful way to implement this?
The CSI data has variable length [1] but it's fundamentally always tied to a specific frame and as such we've always attached it to that frame using a radiotap vendor namespace. You can easily implement that in a mac80211 driver since it has support for that via RX_FLAG_RADIOTAP_VENDOR_DATA and the associated struct ieee80211_vendor_radiotap that you put into the skb's head. Why should anything else be needed? johannes [1] mostly depending on the bandwidth
