iwlwifi: mvm: rs: disable MCS9 Tx workaround

MCS9 introduces some corner cases in the current rs
algorithm which may lead to non optimal throughput and
instability in the throughput. Until all the corner
cases are resolved disable MCS9 for Tx as a workaround
which yields better throughput results as MCS8 is much
more stable.

Signed-off-by: Eyal Shapira <eyal@wizery.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

diff --git a/drivers/net/wireless/iwlwifi/mvm/rs.c b/drivers/net/wireless/iwlwifi/mvm/rs.c
index 62b29d7f80f01d2760829f3ddbae584919e74875..1f06450007bab36ab272b2350dd6e443b2bd74ff 100644 (file)
--- a/drivers/net/wireless/iwlwifi/mvm/rs.c
+++ b/drivers/net/wireless/iwlwifi/mvm/rs.c
@@ -2207,6 +2207,10 @@ static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
                        if (i == IWL_RATE_9M_INDEX)
                                continue;
 
+                       /* Disable MCS9 as a workaround */
+                       if (i == IWL_RATE_MCS_9_INDEX)
+                               continue;
+
                        /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
                        if (i == IWL_RATE_MCS_9_INDEX &&
                            sta->bandwidth == IEEE80211_STA_RX_BW_20)
@@ -2225,6 +2229,10 @@ static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
                        if (i == IWL_RATE_9M_INDEX)
                                continue;
 
+                       /* Disable MCS9 as a workaround */
+                       if (i == IWL_RATE_MCS_9_INDEX)
+                               continue;
+
                        /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
                        if (i == IWL_RATE_MCS_9_INDEX &&
                            sta->bandwidth == IEEE80211_STA_RX_BW_20)