From: Nicolas Escande nico.escande@gmail.com
commit 859ae7018316daa4adbc496012dcbbb458d7e510 upstream.
There are two problems with the current code that have been highlighted with the AQL feature that is now enbaled by default.
First problem is in ieee80211_rx_h_mesh_fwding(), ieee80211_select_queue_80211() is used on received packets to choose the sending AC queue of the forwarding packet although this function should only be called on TX packet (it uses ieee80211_tx_info). This ends with forwarded mesh packets been sent on unrelated random AC queue. To fix that, AC queue can directly be infered from skb->priority which has been extracted from QOS info (see ieee80211_parse_qos()).
Second problem is the value of queue_mapping set on forwarded mesh frames via skb_set_queue_mapping() is not the AC of the packet but a hardware queue index. This may or may not work depending on AC to HW queue mapping which is driver specific.
Both of these issues lead to improper AC selection while forwarding mesh packets but more importantly due to improper airtime accounting (which is done on a per STA, per AC basis) caused traffic stall with the introduction of AQL.
Fixes: cf44012810cc ("mac80211: fix unnecessary frame drops in mesh fwding") Fixes: d3c1597b8d1b ("mac80211: fix forwarded mesh frame queue mapping") Co-developed-by: Remi Pommarel repk@triplefau.lt Signed-off-by: Remi Pommarel repk@triplefau.lt Signed-off-by: Nicolas Escande nico.escande@gmail.com Link: https://lore.kernel.org/r/20220214173214.368862-1-nico.escande@gmail.com Signed-off-by: Johannes Berg johannes.berg@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/mac80211/rx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -2918,13 +2918,13 @@ ieee80211_rx_h_mesh_fwding(struct ieee80 ether_addr_equal(sdata->vif.addr, hdr->addr3)) return RX_CONTINUE;
- ac = ieee80211_select_queue_80211(sdata, skb, hdr); + ac = ieee802_1d_to_ac[skb->priority]; q = sdata->vif.hw_queue[ac]; if (ieee80211_queue_stopped(&local->hw, q)) { IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion); return RX_DROP_MONITOR; } - skb_set_queue_mapping(skb, q); + skb_set_queue_mapping(skb, ac);
if (!--mesh_hdr->ttl) { if (!is_multicast_ether_addr(hdr->addr1))