* The GFAR buffer descriptors track the ring buffers. The rx_bd_base
* and tx_bd_base always point to the currently available buffer.
* The dirty_tx tracks the current buffer that is being sent by the
* The GFAR buffer descriptors track the ring buffers. The rx_bd_base
* and tx_bd_base always point to the currently available buffer.
* The dirty_tx tracks the current buffer that is being sent by the