netif_put
.netif_put = cs_put,
.netif_put = efinet_put,
return (*((struct netif*)desc->io_netif)->nif_driver->netif_put)
n = netif_put(d, eh, len);
ssize_t netif_put(struct iodesc *, void *, size_t);
if (drv->netif_put == NULL)
rv = drv->netif_put(desc, pkt, len);
int (*netif_put)(struct iodesc *, void *, size_t);
.netif_put = efinet_put,