BRB_BLOCK_SIZE
#define BRB_HYST_BLOCKS (BRB_HYST_BYTES / BRB_BLOCK_SIZE)
tc_headroom_blocks = (u32)DIV_ROUND_UP(req->headroom_per_tc, BRB_BLOCK_SIZE);
min_pkt_size_blocks = (u32)DIV_ROUND_UP(req->min_pkt_size, BRB_BLOCK_SIZE);
tc_guaranteed_blocks = (u32)DIV_ROUND_UP(req->guranteed_per_tc, BRB_BLOCK_SIZE);