commit f92659a110436cdfdd8d7661188ba059b61404b7
author Sara Sharon <sara.sharon@intel.com> Wed Feb 03 15:04:49 2016 +0200
committer Emmanuel Grumbach <emmanuel.grumbach@intel.com> Sat Feb 27 22:00:11 2016 +0200
tree b8e849851596b1c061ea9d5100bff457932b4784
parent 7ed3eec53023deecffb61abbcb7f8408ff6ab064

iwlwifi: mvm: support VHT MU-MIMO notification

When the device is in d0i3/d3 we will not receive the VHT
MU-MIMO group id management frame. Instead, firmware will
notify us upon exit on the current status and we can in turn
update mac80211. Support this notification.
While at it, also check as a precaution that the vif is indeed
the VHT MU-MIMO owner before updating the firmware.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index 1a4946f..b755161 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -7,6 +7,7 @@
  *
  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
+ * Copyright(c) 2016 Intel Deutschland GmbH
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -1780,6 +1781,34 @@
 				    0, sizeof(cmd), &cmd);
 }
 
+static void iwl_mvm_mu_mimo_iface_iterator(void *_data, u8 *mac,
+					   struct ieee80211_vif *vif)
+{
+	if (vif->mu_mimo_owner) {
+		struct iwl_mu_group_mgmt_notif *notif = _data;
+
+		/*
+		 * MU-MIMO Group Id action frame is little endian. We treat
+		 * the data received from firmware as if it came from the
+		 * action frame, so no conversion is needed.
+		 */
+		ieee80211_update_mu_groups(vif,
+					   (u8 *)&notif->membership_status,
+					   (u8 *)&notif->user_position);
+	}
+}
+
+void iwl_mvm_mu_mimo_grp_notif(struct iwl_mvm *mvm,
+			       struct iwl_rx_cmd_buffer *rxb)
+{
+	struct iwl_rx_packet *pkt = rxb_addr(rxb);
+	struct iwl_mu_group_mgmt_notif *notif = (void *)pkt->data;
+
+	ieee80211_iterate_active_interfaces_atomic(
+			mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
+			iwl_mvm_mu_mimo_iface_iterator, notif);
+}
+
 static void iwl_mvm_bss_info_changed_station(struct iwl_mvm *mvm,
 					     struct ieee80211_vif *vif,
 					     struct ieee80211_bss_conf *bss_conf,
@@ -1890,10 +1919,10 @@
 
 		/*
 		 * The firmware tracks the MU-MIMO group on its own.
-		 * However, on HW restart we should restore this data
+		 * However, on HW restart we should restore this data.
 		 */
 		if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
-		    changes & BSS_CHANGED_MU_GROUPS) {
+		    (changes & BSS_CHANGED_MU_GROUPS) && vif->mu_mimo_owner) {
 			ret = iwl_mvm_update_mu_groups(mvm, vif);
 			if (ret)
 				IWL_ERR(mvm,