Hello Felix, As user of the mesh part of mac80211 on multiple products at work let me say thank you for all the work you do on wifi, especially on 80211s, and especially the recent improvements you made for mesh fast RX/TX & cross vendor AMSDU compat We upgraded our kernel from an older (5.15) to a newer 6.4. The problem is STP doesn't work anymore and alas we use it for now (for the better or worse). What I gathered so far from my setup: - we use ath9k & ath10k - in my case STP frames are received as regular packet and not as amsdu - the received packets have a wrong length of 44 in tcpdump (instead of 38 with our previous kernel) - llc_fixup_skb() tries to pull some 41 bytes out of a 35 bytes packet this makes llc_rcv() discard the frames & breaks STP >From bisecting the culprit seems to be 986e43b19ae9176093da35e0a844e65c8bf9ede7 (wifi: mac80211: fix receiving A-MSDU frames on mesh interfaces) I guess that your changes to handle both ampdu subframes & normal frames in the same datapath ends up putting a wrong skb->len for STP (multicast) frames ? Honestly I don't understand enough of the 80211 internals & spec to pinpoint the exact problem. It seems this change was already in the 6.3 kernel so I guess someone should have seen it before (but I didn't find anything..) ? Maybe I missed something... Anyway I'm happy to provide more info or try anything you throw at me. Thanks, --- Nicolas E.
