mac80211: backport patch that allows receiving packets with non-standard VHT MCS10...

Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry picked from commit 56ae4eb90864373dd4663f579851290be74430aa)

diff --git a/package/kernel/mac80211/patches/subsys/327-mac80211-allow-non-standard-VHT-MCS-10-11.patch b/package/kernel/mac80211/patches/subsys/327-mac80211-allow-non-standard-VHT-MCS-10-11.patch
new file mode 100644 (file)
index 0000000..7c68e75
--- /dev/null
+++ b/package/kernel/mac80211/patches/subsys/327-mac80211-allow-non-standard-VHT-MCS-10-11.patch
@@ -0,0 +1,36 @@
+From: Ping-Ke Shih <pkshih@realtek.com>
+Date: Mon, 3 Jan 2022 09:36:21 +0800
+Subject: [PATCH] mac80211: allow non-standard VHT MCS-10/11
+
+Some AP can possibly try non-standard VHT rate and mac80211 warns and drops
+packets, and leads low TCP throughput.
+
+    Rate marked as a VHT rate but data is invalid: MCS: 10, NSS: 2
+    WARNING: CPU: 1 PID: 7817 at net/mac80211/rx.c:4856 ieee80211_rx_list+0x223/0x2f0 [mac8021
+
+Since commit c27aa56a72b8 ("cfg80211: add VHT rate entries for MCS-10 and MCS-11")
+has added, mac80211 adds this support as well.
+
+After this patch, throughput is good and iw can get the bitrate:
+    rx bitrate:        975.1 MBit/s VHT-MCS 10 80MHz short GI VHT-NSS 2
+or
+    rx bitrate:        1083.3 MBit/s VHT-MCS 11 80MHz short GI VHT-NSS 2
+
+Buglink: https://bugzilla.suse.com/show_bug.cgi?id=1192891
+Reported-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
+Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
+Link: https://lore.kernel.org/r/20220103013623.17052-1-pkshih@realtek.com
+Signed-off-by: Johannes Berg <johannes.berg@intel.com>
+---
+
+--- a/net/mac80211/rx.c
++++ b/net/mac80211/rx.c
+@@ -4945,7 +4945,7 @@ void ieee80211_rx_list(struct ieee80211_
+                               goto drop;
+                       break;
+               case RX_ENC_VHT:
+-                      if (WARN_ONCE(status->rate_idx > 9 ||
++                      if (WARN_ONCE(status->rate_idx > 11 ||
+                                     !status->nss ||
+                                     status->nss > 8,
+                                     "Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n",