cpdma_chan_process
num_tx += cpdma_chan_process(txv->ch, cur_budget);
num_tx = cpdma_chan_process(cpsw->txv[0].ch, budget);
num_rx += cpdma_chan_process(rxv->ch, cur_budget);
num_rx = cpdma_chan_process(cpsw->rxv[0].ch, budget);
int cpdma_chan_process(struct cpdma_chan *chan, int quota);
cpdma_chan_process(priv->txchan, EMAC_DEF_TX_MAX_SERVICE);
num_rx_pkts = cpdma_chan_process(priv->rxchan, budget);