tb_ring_alloc_tx
ring = tb_ring_alloc_tx(xd->tb->nhi, -1, TBNET_RING_SIZE, flags);
ctl->tx = tb_ring_alloc_tx(nhi, 0, 10, RING_FLAG_NO_SUSPEND);
ring = tb_ring_alloc_tx(xd->tb->nhi, -1, DMA_TEST_TX_RING_SIZE,
EXPORT_SYMBOL_GPL(tb_ring_alloc_tx);
struct tb_ring *tb_ring_alloc_tx(struct tb_nhi *nhi, int hop, int size,