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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",
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