NS_TXMON
uint16_t txmon = kring->tx == NR_TX ? NS_TXMON : 0;
ms->flags = (s->flags & ~NS_TXMON) | txmon;
uint16_t txmon = kring->tx == NR_TX ? NS_TXMON : 0;
ms->flags = (s->flags & ~NS_TXMON) | txmon;