``argc`` and ``argv`` arguments are provided to the ``rte_eal_init()``
function. The value returned is the number of parsed arguments:
-.. code-block:: c
-
- int ret = rte_eal_init(argc, argv);
- if (ret < 0)
- rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
+.. literalinclude:: ../../../examples/ptpclient/ptpclient.c
+ :language: c
+ :start-after: Initialize the Environment Abstraction Layer (EAL). 8<
+ :end-before: >8 End of initialization of EAL.
+ :dedent: 1
And than we parse application specific arguments
-.. code-block:: c
-
- argc -= ret;
- argv += ret;
-
- ret = ptp_parse_args(argc, argv);
- if (ret < 0)
- rte_exit(EXIT_FAILURE, "Error with PTP initialization\n");
+.. literalinclude:: ../../../examples/ptpclient/ptpclient.c
+ :language: c
+ :start-after: Parse specific arguments. 8<
+ :end-before: >8 End of parsing specific arguments.
+ :dedent: 1
The ``main()`` also allocates a mempool to hold the mbufs (Message Buffers)
used by the application:
-.. code-block:: c
-
- mbuf_pool = rte_pktmbuf_pool_create("MBUF_POOL", NUM_MBUFS * nb_ports,
- MBUF_CACHE_SIZE, 0, RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id());
+.. literalinclude:: ../../../examples/ptpclient/ptpclient.c
+ :language: c
+ :start-after: Creates a new mempool in memory to hold the mbufs. 8<
+ :end-before: >8 End of a new mempool in memory to hold the mbufs.
+ :dedent: 1
Mbufs are the packet buffer structure used by DPDK. They are explained in
detail in the "Mbuf Library" section of the *DPDK Programmer's Guide*.
The ``main()`` function also initializes all the ports using the user defined
``port_init()`` function with portmask provided by user:
-.. code-block:: c
-
- for (portid = 0; portid < nb_ports; portid++)
- if ((ptp_enabled_port_mask & (1 << portid)) != 0) {
-
- if (port_init(portid, mbuf_pool) == 0) {
- ptp_enabled_ports[ptp_enabled_port_nb] = portid;
- ptp_enabled_port_nb++;
- } else {
- rte_exit(EXIT_FAILURE, "Cannot init port %"PRIu8 "\n",
- portid);
- }
- }
+.. literalinclude:: ../../../examples/ptpclient/ptpclient.c
+ :language: c
+ :start-after: Initialize all ports. 8<
+ :end-before: >8 End of initialization of all ports.
+ :dedent: 1
Once the initialization is complete, the application is ready to launch a
The main work of the application is done within the loop:
-.. code-block:: c
-
- for (portid = 0; portid < ptp_enabled_port_nb; portid++) {
-
- portid = ptp_enabled_ports[portid];
- nb_rx = rte_eth_rx_burst(portid, 0, &m, 1);
-
- if (likely(nb_rx == 0))
- continue;
-
- if (m->ol_flags & PKT_RX_IEEE1588_PTP)
- parse_ptp_frames(portid, m);
-
- rte_pktmbuf_free(m);
- }
+.. literalinclude:: ../../../examples/ptpclient/ptpclient.c
+ :language: c
+ :start-after: Read packet from RX queues. 8<
+ :end-before: >8 End of read packets from RX queues.
+ :dedent: 2
Packets are received one by one on the RX ports and, if required, PTP response
packets are transmitted on the TX ports.
If the offload flags in the mbuf indicate that the packet is a PTP packet then
the packet is parsed to determine which type:
-.. code-block:: c
-
- if (m->ol_flags & PKT_RX_IEEE1588_PTP)
- parse_ptp_frames(portid, m);
+.. literalinclude:: ../../../examples/ptpclient/ptpclient.c
+ :language: c
+ :start-after: Packet is parsed to determine which type. 8<
+ :end-before: >8 End of packet is parsed to determine which type.
+ :dedent: 3
All packets are freed explicitly using ``rte_pktmbuf_free()``.
The ``parse_ptp_frames()`` function processes PTP packets, implementing slave
PTP IEEE1588 L2 functionality.
-.. code-block:: c
-
- void
- parse_ptp_frames(uint16_t portid, struct rte_mbuf *m) {
- struct ptp_header *ptp_hdr;
- struct rte_ether_hdr *eth_hdr;
- uint16_t eth_type;
-
- eth_hdr = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
- eth_type = rte_be_to_cpu_16(eth_hdr->ether_type);
-
- if (eth_type == PTP_PROTOCOL) {
- ptp_data.m = m;
- ptp_data.portid = portid;
- ptp_hdr = (struct ptp_header *)(rte_pktmbuf_mtod(m, char *)
- + sizeof(struct rte_ether_hdr));
-
- switch (ptp_hdr->msgtype) {
- case SYNC:
- parse_sync(&ptp_data);
- break;
- case FOLLOW_UP:
- parse_fup(&ptp_data);
- break;
- case DELAY_RESP:
- parse_drsp(&ptp_data);
- print_clock_info(&ptp_data);
- break;
- default:
- break;
- }
- }
- }
+.. literalinclude:: ../../../examples/ptpclient/ptpclient.c
+ :language: c
+ :start-after: Parse ptp frames. 8<
+ :end-before: >8 End of function processes PTP packets.
There are 3 types of packets on the RX path which we must parse to create a minimal
implementation of the PTP slave client: