[dpdk-dev] How classification happens in scheduling ?

[ravulakollu.kumar at wipro.com]

Hi all,

Could someone explain me how this code snippet determining subport,pipe,traffic_class,queue,color.

        uint16_t *pdata = rte_pktmbuf_mtod(m, uint16_t *); //points to the start of the data in the mbuf

        *subport = (rte_be_to_cpu_16(pdata[SUBPORT_OFFSET]) & 0x0FFF) &(port_params.n_subports_per_port - 1); /* Outer VLAN ID*/
        *pipe = (rte_be_to_cpu_16(pdata[PIPE_OFFSET]) & 0x0FFF) & (port_params.n_pipes_per_subport - 1); /* Inner VLAN ID */
        *traffic_class = (pdata[QUEUE_OFFSET] & 0x0F) & (RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE - 1); /* Destination IP */
        *queue = ((pdata[QUEUE_OFFSET] >> 8) & 0x0F) & (RTE_SCHED_QUEUES_PER_TRAFFIC_CLASS - 1) ; /* Destination IP */
        *color = pdata[COLOR_OFFSET] & 0x03;    /* Destination IP */

Thanks & Regards,
Uday
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