__IXGBE_RX_BUILD_SKB_ENABLED
test_bit(__IXGBE_RX_BUILD_SKB_ENABLED, &(ring)->state)
clear_bit(__IXGBE_RX_BUILD_SKB_ENABLED, &rx_ring->state);
set_bit(__IXGBE_RX_BUILD_SKB_ENABLED, &rx_ring->state);