qcacmn: A vendor roam control configuration for delaying hand off for RX

Introduce a run time roam configuration for "hand off delay for RX".
This value, in milliseconds, will delay the hand off for the specified
time to receive pending RX frames from the current BSS.

Change-Id: I961109a2f9287a611ae8f4b38e2ea824ecf9c559
CRs-Fixed: 3329952

os_if/linux/qca_vendor.h

@@ -3527,6 +3527,10 @@ enum qca_vendor_attr_roam_candidate_selection_criteria {
  *	If the current RX link speed is above the threshold, roaming is not
  *	needed. If this attribute is not configured, or if it is set to 0, the
  *	driver will not consider the RX link speed in the roaming decision.
+ *
+ * @QCA_ATTR_ROAM_CONTROL_HO_DELAY_FOR_RX: u16 value in milliseconds.
+ *	Optional parameter. This configuration delays hand-off (in msec) by the
+ *	specified duration to receive pending rx frames from current BSS.
  */
 enum qca_vendor_attr_roam_control {
 	QCA_ATTR_ROAM_CONTROL_ENABLE = 1,
@@ -3547,6 +3551,7 @@ enum qca_vendor_attr_roam_control {
 	QCA_ATTR_ROAM_CONTROL_CANDIDATE_RSSI_THRESHOLD_6GHZ = 16,
 	QCA_ATTR_ROAM_CONTROL_BAND_MASK = 17,
 	QCA_ATTR_ROAM_CONTROL_RX_LINKSPEED_THRESHOLD = 24,
+	QCA_ATTR_ROAM_CONTROL_HO_DELAY_FOR_RX = 25,
 
 	/* keep last */
 	QCA_ATTR_ROAM_CONTROL_AFTER_LAST,