wifi: mac80211: remove mesh forwarding congestion check

Now that all drivers use iTXQ, it does not make sense to check to drop
tx forwarding packets when the driver has stopped the queues.
fq_codel will take care of dropping packets when the queues fill up

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20230213100855.34315-3-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/debugfs_netdev.c

@@ -603,8 +603,6 @@ IEEE80211_IF_FILE(fwded_mcast, u.mesh.mshstats.fwded_mcast, DEC);
 IEEE80211_IF_FILE(fwded_unicast, u.mesh.mshstats.fwded_unicast, DEC);
 IEEE80211_IF_FILE(fwded_frames, u.mesh.mshstats.fwded_frames, DEC);
 IEEE80211_IF_FILE(dropped_frames_ttl, u.mesh.mshstats.dropped_frames_ttl, DEC);
-IEEE80211_IF_FILE(dropped_frames_congestion,
-		  u.mesh.mshstats.dropped_frames_congestion, DEC);
 IEEE80211_IF_FILE(dropped_frames_no_route,
 		  u.mesh.mshstats.dropped_frames_no_route, DEC);
 
@@ -740,7 +738,6 @@ static void add_mesh_stats(struct ieee80211_sub_if_data *sdata)
 	MESHSTATS_ADD(fwded_frames);
 	MESHSTATS_ADD(dropped_frames_ttl);
 	MESHSTATS_ADD(dropped_frames_no_route);
-	MESHSTATS_ADD(dropped_frames_congestion);
 #undef MESHSTATS_ADD
 }
 

net/mac80211/ieee80211_i.h

@@ -327,7 +327,6 @@ struct mesh_stats {
 	__u32 fwded_frames;		/* Mesh total forwarded frames */
 	__u32 dropped_frames_ttl;	/* Not transmitted since mesh_ttl == 0*/
 	__u32 dropped_frames_no_route;	/* Not transmitted, no route found */
-	__u32 dropped_frames_congestion;/* Not forwarded due to congestion */
 };
 
 #define PREQ_Q_F_START		0x1

net/mac80211/rx.c

@@ -2926,11 +2926,6 @@ ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx)
 		return RX_CONTINUE;
 
 	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, ac);
 
 	if (!--mesh_hdr->ttl) {