NAPI_STATE_THREADED_BUSY_POLL
NAPIF_STATE_THREADED_BUSY_POLL = BIT(NAPI_STATE_THREADED_BUSY_POLL),
assign_bit(NAPI_STATE_THREADED_BUSY_POLL, &napi->state, busy_poll);
if (test_bit(NAPI_STATE_THREADED_BUSY_POLL, &n->state))