iwlwifi: mvm: choose an initial tx rate based on rssi conditions

Improve the initial tx rate and antenna selection to be based on
the rssi of the last rx. This avoids starting at the lowest legacy
rate always and requiring more tx traffic to "climb" up the rates.
Since this option might cause trouble in certain setups, allow to
disable it by default.

Signed-off-by: Eyal Shapira <eyalx.shapira@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

1 files changed, 24 insertions, 17 deletions

diff --git a/drivers/net/wireless/iwlwifi/mvm/rx.c b/drivers/net/wireless/iwlwifi/mvm/rx.c
index a6cb84ed653f..3cf40f3f58ec 100644
--- a/drivers/net/wireless/iwlwifi/mvm/rx.c
+++ b/drivers/net/wireless/iwlwifi/mvm/rx.c
@@ -246,6 +246,7 @@ int iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 	struct iwl_rx_packet *pkt = rxb_addr(rxb);
 	struct iwl_rx_phy_info *phy_info;
 	struct iwl_rx_mpdu_res_start *rx_res;
+	struct ieee80211_sta *sta;
 	u32 len;
 	u32 ampdu_status;
 	u32 rate_n_flags;
@@ -261,23 +262,6 @@ int iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 	memset(&rx_status, 0, sizeof(rx_status));
 
 	/*
-	 * We have tx blocked stations (with CS bit). If we heard frames from
-	 * a blocked station on a new channel we can TX to it again.
-	 */
-	if (unlikely(mvm->csa_tx_block_bcn_timeout)) {
-		struct ieee80211_sta *sta;
-
-		rcu_read_lock();
-
-		sta = ieee80211_find_sta(
-			rcu_dereference(mvm->csa_tx_blocked_vif), hdr->addr2);
-		if (sta)
-			iwl_mvm_sta_modify_disable_tx_ap(mvm, sta, false);
-
-		rcu_read_unlock();
-	}
-
-	/*
 	 * drop the packet if it has failed being decrypted by HW
 	 */
 	if (iwl_mvm_set_mac80211_rx_flag(mvm, hdr, &rx_status, rx_pkt_status)) {
@@ -325,6 +309,29 @@ int iwl_mvm_rx_rx_mpdu(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 	IWL_DEBUG_STATS_LIMIT(mvm, "Rssi %d, TSF %llu\n", rx_status.signal,
 			      (unsigned long long)rx_status.mactime);
 
+	rcu_read_lock();
+	/*
+	 * We have tx blocked stations (with CS bit). If we heard frames from
+	 * a blocked station on a new channel we can TX to it again.
+	 */
+	if (unlikely(mvm->csa_tx_block_bcn_timeout)) {
+		sta = ieee80211_find_sta(
+			rcu_dereference(mvm->csa_tx_blocked_vif), hdr->addr2);
+		if (sta)
+			iwl_mvm_sta_modify_disable_tx_ap(mvm, sta, false);
+	}
+
+	/* This is fine since we don't support multiple AP interfaces */
+	sta = ieee80211_find_sta_by_ifaddr(mvm->hw, hdr->addr2, NULL);
+	if (sta) {
+		struct iwl_mvm_sta *mvmsta;
+		mvmsta = iwl_mvm_sta_from_mac80211(sta);
+		rs_update_last_rssi(mvm, &mvmsta->lq_sta,
+				    &rx_status);
+	}
+
+	rcu_read_unlock();
+
 	/* set the preamble flag if appropriate */
 	if (phy_info->phy_flags & cpu_to_le16(RX_RES_PHY_FLAGS_SHORT_PREAMBLE))
 		rx_status.flag |= RX_FLAG_SHORTPRE;