From 3b4b1ae83c498b0b8d5a7de3c5e6af95a61887e7 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@nbd.name>
Date: Wed, 16 Sep 2020 18:47:52 +0200
Subject: [PATCH] mac80211: allow bigger A-MSDU sizes in VHT, even if HT is
limited
Improves tx throughput when connecting to some APs (e.g. Asus RT-AC88U)
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: maurerr <mariusd84@gmail.com>
---
...igger-A-MSDU-sizes-in-VHT-even-if-HT.patch | 26 +++++++++++++++++++
1 file changed, 26 insertions(+)
create mode 100644 package/kernel/mac80211/patches/subsys/330-mac80211-allow-bigger-A-MSDU-sizes-in-VHT-even-if-HT.patch
diff --git a/package/kernel/mac80211/patches/subsys/330-mac80211-allow-bigger-A-MSDU-sizes-in-VHT-even-if-HT.patch b/package/kernel/mac80211/patches/subsys/330-mac80211-allow-bigger-A-MSDU-sizes-in-VHT-even-if-HT.patch
new file mode 100644
index 00000000000..b67030d135b
--- /dev/null
+++ b/package/kernel/mac80211/patches/subsys/330-mac80211-allow-bigger-A-MSDU-sizes-in-VHT-even-if-HT.patch
@@ -0,0 +1,26 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Wed, 16 Sep 2020 18:43:46 +0200
+Subject: [PATCH] mac80211: allow bigger A-MSDU sizes in VHT, even if HT is
+ limited
+
+Some APs (e.g. Asus RT-AC88U) have been observed to report an HT MSDU size
+limit of 3839 and a VHT limit of 7991. These APs can handle bigger frames
+than 3839 bytes just fine, so we should remove the VHT limit based on the
+HT capabilities. This improves tx throughput.
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/net/mac80211/vht.c
++++ b/net/mac80211/vht.c
+@@ -315,10 +315,6 @@ ieee80211_vht_cap_ie_to_sta_vht_cap(stru
+
+ sta->sta.bandwidth = ieee80211_sta_cur_vht_bw(sta);
+
+- /* If HT IE reported 3839 bytes only, stay with that size. */
+- if (sta->sta.max_amsdu_len == IEEE80211_MAX_MPDU_LEN_HT_3839)
+- return;
+-
+ switch (vht_cap->cap & IEEE80211_VHT_CAP_MAX_MPDU_MASK) {
+ case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454:
+ sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_11454;