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Priority FIFO in DM8148

Respected Sir/Madam,

I am trying to transmit Ethernet packet according to their priority (VLAN Tagged Packets), so that higher priority packets transmit first than lower priority packets.  As according to reference manual we can do it just by configuring CPDMA_RX_CH_MAP and CPDMA_TX_PRI_MAP and configuring some registers as given in rate limiting mode.Is it enough? in my thinking i have to do some coding at driver level such that my higher priority data has to be pushed in higher priority queues and goal can be achieved. Also can i use NDK in this situations.Plz suggest me in this regard.

Thanks in advanced.