[openwrt/openwrt] mac80211: fix a regression in starting aggregation sessions on mesh interfaces

[LEDE Commits]

nbd pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/8bb4437c01ca35a5ac67e391630a1b24cb52dbb7

commit 8bb4437c01ca35a5ac67e391630a1b24cb52dbb7
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Tue Jun 29 13:32:31 2021 +0200

    mac80211: fix a regression in starting aggregation sessions on mesh interfaces
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 ...x-starting-aggregation-sessions-on-mesh-i.patch | 112 +++++++++++++++++++++
 1 file changed, 112 insertions(+)

diff --git a/package/kernel/mac80211/patches/subsys/379-mac80211-fix-starting-aggregation-sessions-on-mesh-i.patch b/package/kernel/mac80211/patches/subsys/379-mac80211-fix-starting-aggregation-sessions-on-mesh-i.patch
new file mode 100644
index 0000000000..56eafaf847
--- /dev/null
+++ b/package/kernel/mac80211/patches/subsys/379-mac80211-fix-starting-aggregation-sessions-on-mesh-i.patch
@@ -0,0 +1,112 @@
+From: Felix Fietkau <nbd at nbd.name>
+Date: Tue, 29 Jun 2021 13:25:09 +0200
+Subject: [PATCH] mac80211: fix starting aggregation sessions on mesh
+ interfaces
+
+The logic for starting aggregation sessions was recently moved from minstrel_ht
+to mac80211, into the subif tx handler just after the sta lookup.
+Unfortunately this didn't work for mesh interfaces, since the sta lookup is
+deferred until a much later point in time on those.
+Fix this by also calling the aggregation check right after the deferred sta
+lookup.
+
+Fixes: 08a46c642001 ("mac80211: move A-MPDU session check from minstrel_ht to mac80211")
+Signed-off-by: Felix Fietkau <nbd at nbd.name>
+---
+
+--- a/net/mac80211/tx.c
++++ b/net/mac80211/tx.c
+@@ -1159,6 +1159,29 @@ static bool ieee80211_tx_prep_agg(struct
+ 	return queued;
+ }
+ 
++static void
++ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata,
++		     struct sta_info *sta,
++		     struct sk_buff *skb)
++{
++	struct rate_control_ref *ref = sdata->local->rate_ctrl;
++	u16 tid;
++
++	if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER))
++		return;
++
++	if (!sta || !sta->sta.ht_cap.ht_supported ||
++	    !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO ||
++	    skb->protocol == sdata->control_port_protocol)
++		return;
++
++	tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
++	if (likely(sta->ampdu_mlme.tid_tx[tid]))
++		return;
++
++	ieee80211_start_tx_ba_session(&sta->sta, tid, 0);
++}
++
+ /*
+  * initialises @tx
+  * pass %NULL for the station if unknown, a valid pointer if known
+@@ -1172,6 +1195,7 @@ ieee80211_tx_prepare(struct ieee80211_su
+ 	struct ieee80211_local *local = sdata->local;
+ 	struct ieee80211_hdr *hdr;
+ 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
++	bool aggr_check = false;
+ 	int tid;
+ 
+ 	memset(tx, 0, sizeof(*tx));
+@@ -1202,8 +1226,10 @@ ieee80211_tx_prepare(struct ieee80211_su
+ 			   tx->sdata->control_port_protocol == tx->skb->protocol) {
+ 			tx->sta = sta_info_get_bss(sdata, hdr->addr1);
+ 		}
+-		if (!tx->sta && !is_multicast_ether_addr(hdr->addr1))
++		if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) {
+ 			tx->sta = sta_info_get(sdata, hdr->addr1);
++			aggr_check = true;
++		}
+ 	}
+ 
+ 	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
+@@ -1213,8 +1239,12 @@ ieee80211_tx_prepare(struct ieee80211_su
+ 		struct tid_ampdu_tx *tid_tx;
+ 
+ 		tid = ieee80211_get_tid(hdr);
+-
+ 		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
++		if (!tid_tx && aggr_check) {
++			ieee80211_aggr_check(sdata, tx->sta, skb);
++			tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
++		}
++
+ 		if (tid_tx) {
+ 			bool queued;
+ 
+@@ -3949,29 +3979,6 @@ void ieee80211_txq_schedule_start(struct
+ }
+ EXPORT_SYMBOL(ieee80211_txq_schedule_start);
+ 
+-static void
+-ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata,
+-		     struct sta_info *sta,
+-		     struct sk_buff *skb)
+-{
+-	struct rate_control_ref *ref = sdata->local->rate_ctrl;
+-	u16 tid;
+-
+-	if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER))
+-		return;
+-
+-	if (!sta || !sta->sta.ht_cap.ht_supported ||
+-	    !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO ||
+-	    skb->protocol == sdata->control_port_protocol)
+-		return;
+-
+-	tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
+-	if (likely(sta->ampdu_mlme.tid_tx[tid]))
+-		return;
+-
+-	ieee80211_start_tx_ba_session(&sta->sta, tid, 0);
+-}
+-
+ void __ieee80211_subif_start_xmit(struct sk_buff *skb,
+ 				  struct net_device *dev,
+ 				  u32 info_flags,