buffer_state
unsigned long buffer_state;
buffer_state = gpio->buffer[offset / 8] & gpio_mask;
bitmap_set_value8(bits, buffer_state, offset);
struct buffer_state rx_buff[RX_BD_NUM];
struct buffer_state tx_buff[TX_BD_NUM];
struct buffer_state *tx_buff = &priv->tx_buff[*txbd_dirty];
struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd];
struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd];
struct buffer_state *tx_buff = &priv->tx_buff[i];
struct buffer_state *rx_buff = &priv->rx_buff[i];