qcacmn: Set WMI_PMK_CACHE_OP_FLAG_FLUSH_ALL only for pmksa_flush

The supplicant sends del_pmksa command to delete the pmk,pmkid
for a particular bssid. In this command pmk_len will be 0.
In send_set_del_pmkid_cache_cmd_tlv() the host driver currently
checks the pmk_len to set WMI_PMK_CACHE_OP_FLAG_FLUSH_ALL.
If pmk_len is 0 WMI_PMK_CACHE_OP_FLAG_FLUSH_ALL is set, which
is not correct. pmk_len will be zero in both the flush and delete
cases.

So add a new flag is_flush_all which will be set to true when the
supplicant sends pmksa flush command.
At WMI based on this flag set the flush flag to the wmi cmd.

Change-Id: I7626c500721a4b8cccbb21a08d4235c041456d1b
CRs-Fixed: 2502478

wmi/inc/wmi_unified_sta_param.h

@@ -204,6 +204,8 @@ struct sar_limit_event {
  * @cache_id: PMK Cache ID
  * @cat_flag: whether (bssid) or (ssid,cache_id) is valid
  * @action_flag: add/delete the entry
+ * @is_flush_all: FLAG to indicate PMKSA flush. True if PMKSA cache flush is
+ * needed.
  */
 struct wmi_unified_pmk_cache {
 	uint8_t             vdev_id;
@@ -216,6 +218,7 @@ struct wmi_unified_pmk_cache {
 	uint32_t            cache_id;
 	uint32_t            cat_flag;
 	uint32_t            action_flag;
+	bool                is_flush_all;
 };
 
 #define WMI_QOS_NUM_AC_MAX 4

wmi/src/wmi_unified_sta_tlv.c

@@ -1581,7 +1581,8 @@ static QDF_STATUS send_set_del_pmkid_cache_cmd_tlv(wmi_unified_t wmi_handle,
 	wmi_pmk_cache *pmksa;
 	uint32_t len = sizeof(*cmd);
 
-	if (pmk_info->pmk_len)
+	if (pmk_info &&
+	    !pmk_info->is_flush_all)
 		len += WMI_TLV_HDR_SIZE + sizeof(*pmksa);
 
 	buf = wmi_buf_alloc(wmi_handle, len);
@@ -1599,8 +1600,8 @@ static QDF_STATUS send_set_del_pmkid_cache_cmd_tlv(wmi_unified_t wmi_handle,
 
 	cmd->vdev_id = pmk_info->vdev_id;
 
-	/* If pmk_info->pmk_len is 0, this is a flush request */
-	if (!pmk_info->pmk_len) {
+	/* If pmk_info->is_flush_all is true, this is a flush request */
+	if (pmk_info->is_flush_all) {
 		cmd->op_flag = WMI_PMK_CACHE_OP_FLAG_FLUSH_ALL;
 		cmd->num_cache = 0;
 		goto send_cmd;