qcacld-3.0: Follow Ap's BW when moved from 40 MHz to 20 MHz in 2.4 GHz

For 2.4 GHz band, if AP switches its BW from 40 MHz to 20 MHz, it
changes its beacon respectivily with ch_width 20 MHz without STA
disconnection.
This will result in TDLS remaining on 40 MHz and not follwoing APs BW
on 2.4 GHz.
Better Teardown the link here and with traffic going on between peers
the tdls connection will again be restablished with the new BW

Change-Id: I7f7b3cdc7937b2d4b78df46ca970fae22efc2ead
CRs-Fixed: 3243624

core/mac/src/pe/lim/lim_process_tdls.c

@@ -74,7 +74,7 @@
 #include "wlan_mlme_api.h"
 #include "wlan_tdls_public_structs.h"
 #include "wlan_cfg80211_tdls.h"
-
+#include "wlan_tdls_api.h"
 
 /* define NO_PAD_TDLS_MIN_8023_SIZE to NOT padding: See CR#447630
    There was IOT issue with cisco 1252 open mode, where it pads
@@ -3850,6 +3850,29 @@ void lim_update_tdls_set_state_for_fw(struct pe_session *session_entry,
 	session_entry->tdls_send_set_state_disable  = value;
 }
 
+void lim_update_tdls_2g_bw(struct pe_session *session)
+{
+	struct wlan_objmgr_psoc *psoc = NULL;
+
+	/*
+	 * For 2.4 GHz band, if AP switches its BW from 40 MHz to 20 Mhz, it
+	 * changes its beacon respectivily with ch_width 20 Mhz without STA
+	 * disconnection.
+	 * This will result in TDLS remaining on 40 MHz and not follwoing APs BW
+	 * on 2.4 GHz.
+	 * Better Teardown the link here and with traffic going on between peers
+	 * the tdls connection will again be restablished with the new BW
+	 */
+	if (!wlan_reg_is_24ghz_ch_freq(session->curr_op_freq))
+		return;
+
+	psoc = wlan_vdev_get_psoc(session->vdev);
+	if (!psoc)
+		return;
+
+	wlan_tdls_teardown_links(psoc);
+}
+
 /**
  * lim_delete_tdls_peers() - delete tdls peers
  *

core/mac/src/pe/lim/lim_types.h

@@ -918,6 +918,16 @@ void lim_process_tdls_del_sta_rsp(struct mac_context *mac_ctx,
  */
 void lim_update_tdls_set_state_for_fw(struct pe_session *session_entry,
 				      bool value);
+
+/**
+ * lim_update_tdls_2g_bw() - Update TDLS peer bw to fw
+ *
+ * @session_entry - PE sessions
+ *
+ * Return: void
+ */
+void lim_update_tdls_2g_bw(struct pe_session *session);
+
 #else
 static inline QDF_STATUS lim_delete_tdls_peers(struct mac_context *mac_ctx,
 						struct pe_session *session_entry)
@@ -934,6 +944,10 @@ static inline void lim_update_tdls_set_state_for_fw(struct pe_session
 						    *session_entry, bool value)
 {
 }
+
+static inline void lim_update_tdls_2g_bw(struct pe_session *session)
+{
+}
 #endif
 
 /* Algorithms & Link Monitoring related functions */

core/mac/src/pe/lim/lim_utils.c

@@ -4838,6 +4838,7 @@ bool lim_check_vht_op_mode_change(struct mac_context *mac,
 	qdf_mem_copy(tempParam.peer_mac, peerMac, sizeof(tSirMacAddr));
 
 	lim_send_mode_update(mac, &tempParam, pe_session);
+	lim_update_tdls_2g_bw(pe_session);
 
 	return true;
 }