hfi1_ipoib_ring_hwat
tx_ring->avail = hfi1_ipoib_ring_hwat(txq);
if (hfi1_ipoib_used(txq) >= hfi1_ipoib_ring_hwat(txq))
min_t(u32, hfi1_ipoib_ring_hwat(txq),
txq->tx_ring.avail = hfi1_ipoib_ring_hwat(txq);
if (hfi1_ipoib_used(txq) >= hfi1_ipoib_ring_hwat(txq) &&