Rx Channel and Rx Flow Association for 6678 PASS and QMSS

Vilas Bhade

Prodigy 90 points

I am trying to understand programming of PA, QMSS and CPPI from “Pa_simpleExample” that came with the EVM.

- I see that all 24 Rx channels are opened for PA

- I do see that setupFlow0() does association of flow zero to a queue as seen below.

o rxFlowCfg.rx_dest_qnum = 902; /* Override in PA */

o rxFlowCfg.rx_fdq0_sz0_qnum = gvRxBufQ;

What I do not see is association of a Rx channel to the Rx flow zero. Is it done implicitly? is it necessary to associate a Rx channel to a Rx flow? How does PA hardware know which channel to use?

Thanks,

Vilas

over 13 years ago

0 Eric Mao over 13 years ago

Genius 4330 points

I also doubt about how to associate a Rx channel to a Rx flow.

0 Adil Kursad Ergut over 13 years ago in reply to Eric Mao

Prodigy 20 points

There seems to be an association via memory map. Each PKTDMA has a predefined number of receive, transmit channels and Rx Flow Configs (sprugr9e , 4.2 packet DMA). Configuration of these channels(for each PKTDMA) is mapped to special memory address. These addresses are also listed in Multicore Navigator user guide (sprugr9e ,5.3.2 PKTDMA Register Memory Map).

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Rx Channel and Rx Flow Association for 6678 PASS and QMSS