[openwrt/openwrt] mac80211: fix an issue with wds links on 802.11ax devices

[LEDE Commits]

nbd pushed a commit to openwrt/openwrt.git, branch openwrt-21.02:
https://git.openwrt.org/3d0ed7d763b54f22520be74c0c7354947082ef0c

commit 3d0ed7d763b54f22520be74c0c7354947082ef0c
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Sat Jun 19 12:16:49 2021 +0200

    mac80211: fix an issue with wds links on 802.11ax devices
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
    (cherry-picked from commit 89c9ccc3b241d8f07c22a1c271211322c4703f7b)
---
 ...move-iwlwifi-specific-workaround-that-bro.patch | 51 ++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/package/kernel/mac80211/patches/subsys/378-mac80211-remove-iwlwifi-specific-workaround-that-bro.patch b/package/kernel/mac80211/patches/subsys/378-mac80211-remove-iwlwifi-specific-workaround-that-bro.patch
new file mode 100644
index 0000000000..a5ad377e6f
--- /dev/null
+++ b/package/kernel/mac80211/patches/subsys/378-mac80211-remove-iwlwifi-specific-workaround-that-bro.patch
@@ -0,0 +1,51 @@
+From: Felix Fietkau <nbd at nbd.name>
+Date: Sat, 19 Jun 2021 12:10:14 +0200
+Subject: [PATCH] mac80211: remove iwlwifi specific workaround that broke sta
+ NDP tx
+
+Sending nulldata packets is important for sw AP link probing and detecting
+4-address mode links. The checks that dropped these packets were apparently
+added to work around an iwlwifi firmware bug with multi-TID aggregation.
+
+Fixes: 41cbb0f5a295 ("mac80211: add support for HE")
+Cc: stable at vger.kernel.org
+Signed-off-by: Felix Fietkau <nbd at nbd.name>
+---
+
+--- a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
++++ b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
+@@ -1085,6 +1085,9 @@ static int iwl_mvm_tx_mpdu(struct iwl_mv
+ 	if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_INVALID_STA))
+ 		return -1;
+ 
++	if (unlikely(ieee80211_is_any_nullfunc(fc)) && sta->he_cap.has_he)
++		return -1;
++
+ 	if (unlikely(ieee80211_is_probe_resp(fc)))
+ 		iwl_mvm_probe_resp_set_noa(mvm, skb);
+ 
+--- a/net/mac80211/mlme.c
++++ b/net/mac80211/mlme.c
+@@ -1094,11 +1094,6 @@ void ieee80211_send_nullfunc(struct ieee
+ 	struct ieee80211_hdr_3addr *nullfunc;
+ 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
+ 
+-	/* Don't send NDPs when STA is connected HE */
+-	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
+-	    !(ifmgd->flags & IEEE80211_STA_DISABLE_HE))
+-		return;
+-
+ 	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif,
+ 		!ieee80211_hw_check(&local->hw, DOESNT_SUPPORT_QOS_NDP));
+ 	if (!skb)
+@@ -1130,10 +1125,6 @@ static void ieee80211_send_4addr_nullfun
+ 	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
+ 		return;
+ 
+-	/* Don't send NDPs when connected HE */
+-	if (!(sdata->u.mgd.flags & IEEE80211_STA_DISABLE_HE))
+-		return;
+-
+ 	skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
+ 	if (!skb)
+ 		return;