iwlwifi: mvm: toggle tx antenna if tx fails during connection establishment

If tx fails during connection establishment, try another antenna for
the next tx. This will increase the chance to establish connection if
one of the antennas is blocked.  Note that the antenna is toggled even
when failing to tx data frames since connection establishment may use
EAPOLs for 802.1X authentication/ 4 way handshake.

Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.h b/drivers/net/wireless/intel/iwlwifi/mvm/sta.h
index de1a0a2d8723..d52cd888f77d 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.h
@@ -397,6 +397,9 @@ struct iwl_mvm_rxq_dup_data {
  * @ptk_pn: per-queue PTK PN data structures
  * @dup_data: per queue duplicate packet detection data
  * @deferred_traffic_tid_map: indication bitmap of deferred traffic per-TID
+ * @tx_ant: the index of the antenna to use for data tx to this station. Only
+ *	used during connection establishment (e.g. for the 4 way handshake
+ *	exchange).
  *
  * When mac80211 creates a station it reserves some space (hw->sta_data_size)
  * in the structure for use by driver. This structure is placed in that
@@ -439,6 +442,7 @@ struct iwl_mvm_sta {
 	u8 agg_tids;
 	u8 sleep_tx_count;
 	u8 avg_energy;
+	u8 tx_ant;
 };
 
 u16 iwl_mvm_tid_queued(struct iwl_mvm *mvm, struct iwl_mvm_tid_data *tid_data);