nm_txrx_swap
NMR(hwna, nm_txrx_swap(t))[i]->nr_pending_mode =
struct netmap_kring *kring = NMR(hwna, nm_txrx_swap(t))[i];
enum txrx r = nm_txrx_swap(t);
r = nm_txrx_swap(kring->tx);
enum txrx r = nm_txrx_swap(t); /* swap NR_TX <-> NR_RX */
enum txrx r = nm_txrx_swap(t); /* swap NR_TX <-> NR_RX */
enum txrx r = nm_txrx_swap(t); /* swap NR_TX <-> NR_RX */