tap_recv
.recv = tap_recv,
.recv = tap_recv,
.recv = tap_recv,
.recv = tap_recv,
ssize_t tap_recv(struct net_backend *be, const struct iovec *iov, int iovcnt);
ssize_t tap_recv(struct net_backend *be, const struct iovec *iov, int iovcnt);
chan->recv = tap_recv;
static bool tap_recv(packet_t *);