NV_TX2_VALID
tx_flags = NV_TX2_VALID;
tx_flags &= ~NV_TX2_VALID;
cpu_to_le32(NV_TX2_VALID);
!((flags = le32_to_cpu(np->get_tx.ex->flaglen)) & NV_TX2_VALID) &&
np->tx_flags = NV_TX2_VALID;