hbg_get_spec_fifo_max_num
hbg_get_spec_fifo_max_num(priv, ring->dir));
len = hbg_get_spec_fifo_max_num(priv, dir) + 1;
len += hbg_get_spec_fifo_max_num(priv, dir);
hbg_get_spec_fifo_max_num(priv, dir);