SPRUIM2H May 2020 – October 2023 AM2431 , AM2432 , AM2434 , AM6411 , AM6412 , AM6421 , AM6422 , AM6441 , AM6442
Tx channels also use packet queues referred to as “transmit completion queues” to return packets to the host after they are transmitted. A Tx Completion Queue is provided for each Tx Queue. The DMA controllers do not actually write anything back to completion queues (except for a teardown acknowledgement) but instead just increment the reverse occupancy. Transmit completion queues are implemented as the reverse queue on the shared ring structure for a Tx flow.