mac80211: backport fix for an no-ack tx status issue

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Tested-by: Jérôme Benoit <jerome.benoit@piment-noir.org> [WRT1900AC v1]
[added missing package version bump]
Signed-off-by: Petr Štetiar <ynezz@true.cz>
(cherry picked from commit e0ab33ea496f371a0683b18d5555d651f8df1f5e)

2 files changed, 83 insertions, 1 deletions

diff --git a/package/kernel/mac80211/Makefile b/package/kernel/mac80211/Makefile
index cd50bd590e..6220b73701 100644
--- a/package/kernel/mac80211/Makefile
+++ b/package/kernel/mac80211/Makefile
@@ -11,7 +11,7 @@ include $(INCLUDE_DIR)/kernel.mk
 PKG_NAME:=mac80211
 
 PKG_VERSION:=4.19.112-1
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_SOURCE_URL:=@KERNEL/linux/kernel/projects/backports/stable/v4.19.112/
 PKG_HASH:=e60a7aec902638c538b150d0d6165d866eb804845b97d7770acd653fd6a6b718
 
diff --git a/package/kernel/mac80211/patches/subsys/305-mac80211-fix-tx-status-for-no-ack-cases.patch b/package/kernel/mac80211/patches/subsys/305-mac80211-fix-tx-status-for-no-ack-cases.patch
new file mode 100644
index 0000000000..3ea78fb4ab
--- /dev/null
+++ b/package/kernel/mac80211/patches/subsys/305-mac80211-fix-tx-status-for-no-ack-cases.patch
@@ -0,0 +1,82 @@
+From: Markus Theil <markus.theil@tu-ilmenau.de>
+Date: Wed, 18 Dec 2019 15:27:36 +0100
+Subject: [PATCH] mac80211: fix tx status for no ack cases
+
+Before this patch, frames which where successfully transmitted without
+requiring acks where accounted as lost frames.
+
+Signed-off-by: Markus Theil <markus.theil@tu-ilmenau.de>
+Link: https://lore.kernel.org/r/20191218142736.15843-1-markus.theil@tu-ilmenau.de
+Signed-off-by: Johannes Berg <johannes.berg@intel.com>
+---
+
+--- a/net/mac80211/status.c
++++ b/net/mac80211/status.c
+@@ -881,6 +881,7 @@ static void __ieee80211_tx_status(struct
+ 	int rates_idx;
+ 	bool send_to_cooked;
+ 	bool acked;
++	bool noack_success;
+ 	struct ieee80211_bar *bar;
+ 	int shift = 0;
+ 	int tid = IEEE80211_NUM_TIDS;
+@@ -898,6 +899,8 @@ static void __ieee80211_tx_status(struct
+ 			clear_sta_flag(sta, WLAN_STA_SP);
+ 
+ 		acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
++		noack_success = !!(info->flags &
++				   IEEE80211_TX_STAT_NOACK_TRANSMITTED);
+ 
+ 		/* mesh Peer Service Period support */
+ 		if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
+@@ -962,12 +965,12 @@ static void __ieee80211_tx_status(struct
+ 			ieee80211_handle_filtered_frame(local, sta, skb);
+ 			return;
+ 		} else {
+-			if (!acked)
++			if (!acked && !noack_success)
+ 				sta->status_stats.retry_failed++;
+ 			sta->status_stats.retry_count += retry_count;
+ 
+ 			if (ieee80211_is_data_present(fc)) {
+-				if (!acked)
++				if (!acked && !noack_success)
+ 					sta->status_stats.msdu_failed[tid]++;
+ 
+ 				sta->status_stats.msdu_retries[tid] +=
+@@ -994,7 +997,7 @@ static void __ieee80211_tx_status(struct
+ 						       info->status.tx_time, 0);
+ 
+ 		if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
+-			if (info->flags & IEEE80211_TX_STAT_ACK) {
++			if (acked) {
+ 				if (sta->status_stats.lost_packets)
+ 					sta->status_stats.lost_packets = 0;
+ 
+@@ -1002,6 +1005,8 @@ static void __ieee80211_tx_status(struct
+ 				if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
+ 					sta->status_stats.last_tdls_pkt_time =
+ 						jiffies;
++			} else if (noack_success) {
++				/* nothing to do here, do not account as lost */
+ 			} else {
+ 				ieee80211_lost_packet(sta, info);
+ 			}
+@@ -1127,7 +1132,7 @@ void ieee80211_tx_status_ext(struct ieee
+ 
+ 		sta = container_of(pubsta, struct sta_info, sta);
+ 
+-		if (!acked)
++		if (!acked && !noack_success)
+ 			sta->status_stats.retry_failed++;
+ 		sta->status_stats.retry_count += retry_count;
+ 
+@@ -1142,6 +1147,8 @@ void ieee80211_tx_status_ext(struct ieee
+ 				sta->status_stats.last_tdls_pkt_time = jiffies;
+ 		} else if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
+ 			return;
++		} else if (noack_success) {
++			/* nothing to do here, do not account as lost */
+ 		} else {
+ 			ieee80211_lost_packet(sta, info);
+ 		}