i40e_alloc_rx_buffers_zc
ok = i40e_alloc_rx_buffers_zc(ring, I40E_DESC_UNUSED(ring));
failure |= !i40e_alloc_rx_buffers_zc(rx_ring, entries_to_alloc);
bool i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 cleaned_count);