ixgbe: NULL xdp_tx rings on resource cleanup

tx_rings and rx_rings are cleaned up on close paths in ixgbe driver
however, xdp_rings are not. Set the xdp_rings to NULL here so that
we can use the pointer to indicate if the XDP rings are initialized.
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/intel/ixgbe/ixgbe_lib.c

@@ -1018,8 +1018,12 @@ static void ixgbe_free_q_vector(struct ixgbe_adapter *adapter, int v_idx)
 	struct ixgbe_q_vector *q_vector = adapter->q_vector[v_idx];
 	struct ixgbe_ring *ring;
 
-	ixgbe_for_each_ring(ring, q_vector->tx)
+	ixgbe_for_each_ring(ring, q_vector->tx) {
+		if (ring_is_xdp(ring))
+			adapter->xdp_ring[ring->queue_index] = NULL;
+		else
 			adapter->tx_ring[ring->queue_index] = NULL;
+	}
 
 	ixgbe_for_each_ring(ring, q_vector->rx)
 		adapter->rx_ring[ring->queue_index] = NULL;