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>

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index fec82f7c2fa6f35d81da38e471c13eba8008bfb3..93680af62c47da15317c12cb00ccb4e407362029 100644 (file)
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -4929,7 +4929,7 @@ void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta,
                                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",