BDX_TXF_DESC_SZ
f->m.rptr += BDX_TXF_DESC_SZ;
((GET_PCK_TH(tdintcm) * PCK_TH_MULT) / BDX_TXF_DESC_SZ);
(((tx_max_coal * BDX_TXF_DESC_SZ) + PCK_TH_MULT - 1)
return (FIFO_SIZE * (1 << tx_size)) / BDX_TXF_DESC_SZ;