DS_SIZE_ALIGNMENT
((MLX4_EN_TX_MAX_DESC_SIZE - 128) / DS_SIZE_ALIGNMENT) /* units */
dseg += DIV_ROUND_UP(4 + len, DS_SIZE_ALIGNMENT);
dseg += DIV_ROUND_UP(4 + MIN_PKT_LEN, DS_SIZE_ALIGNMENT);
dseg += DIV_ROUND_UP(4 + len, DS_SIZE_ALIGNMENT);
dseg += DIV_ROUND_UP(8 + len, DS_SIZE_ALIGNMENT);
DS_FACT = TXBB_SIZE / DS_SIZE_ALIGNMENT,
bf_size = ds_cnt * DS_SIZE_ALIGNMENT;