ddcd7640ca
The new macro __rte_noreturn, for compiler hinting, is now used where appropriate for consistency. Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
545 lines
17 KiB
ReStructuredText
545 lines
17 KiB
ReStructuredText
.. SPDX-License-Identifier: BSD-3-Clause
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Copyright(c) 2017 Intel Corporation.
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Flow Classify Sample Application
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================================
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The Flow Classify sample application is based on the simple *skeleton* example
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of a forwarding application.
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It is intended as a demonstration of the basic components of a DPDK forwarding
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application which uses the Flow Classify library API's.
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Please refer to the
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:doc:`../prog_guide/flow_classify_lib`
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for more information.
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Compiling the Application
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-------------------------
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To compile the sample application see :doc:`compiling`.
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The application is located in the ``flow_classify`` sub-directory.
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Running the Application
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-----------------------
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To run the example in a ``linux`` environment:
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.. code-block:: console
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cd ~/dpdk/examples/flow_classify
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./build/flow_classify -c 4 -n 4 -- --rule_ipv4="../ipv4_rules_file.txt"
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Please refer to the *DPDK Getting Started Guide*, section
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:doc:`../linux_gsg/build_sample_apps`
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for general information on running applications and the Environment Abstraction
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Layer (EAL) options.
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Sample ipv4_rules_file.txt
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--------------------------
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.. code-block:: console
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#file format:
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#src_ip/masklen dst_ip/masklen src_port : mask dst_port : mask proto/mask priority
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#
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2.2.2.3/24 2.2.2.7/24 32 : 0xffff 33 : 0xffff 17/0xff 0
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9.9.9.3/24 9.9.9.7/24 32 : 0xffff 33 : 0xffff 17/0xff 1
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9.9.9.3/24 9.9.9.7/24 32 : 0xffff 33 : 0xffff 6/0xff 2
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9.9.8.3/24 9.9.8.7/24 32 : 0xffff 33 : 0xffff 6/0xff 3
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6.7.8.9/24 2.3.4.5/24 32 : 0x0000 33 : 0x0000 132/0xff 4
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Explanation
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-----------
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The following sections provide an explanation of the main components of the
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code.
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All DPDK library functions used in the sample code are prefixed with ``rte_``
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and are explained in detail in the *DPDK API Documentation*.
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ACL field definitions for the IPv4 5 tuple rule
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The following field definitions are used when creating the ACL table during
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initialisation of the ``Flow Classify`` application..
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.. code-block:: c
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enum {
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PROTO_FIELD_IPV4,
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SRC_FIELD_IPV4,
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DST_FIELD_IPV4,
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SRCP_FIELD_IPV4,
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DSTP_FIELD_IPV4,
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NUM_FIELDS_IPV4
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};
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enum {
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PROTO_INPUT_IPV4,
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SRC_INPUT_IPV4,
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DST_INPUT_IPV4,
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SRCP_DESTP_INPUT_IPV4
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};
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static struct rte_acl_field_def ipv4_defs[NUM_FIELDS_IPV4] = {
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/* first input field - always one byte long. */
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{
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.type = RTE_ACL_FIELD_TYPE_BITMASK,
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.size = sizeof(uint8_t),
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.field_index = PROTO_FIELD_IPV4,
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.input_index = PROTO_INPUT_IPV4,
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.offset = sizeof(struct rte_ether_hdr) +
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offsetof(struct rte_ipv4_hdr, next_proto_id),
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},
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/* next input field (IPv4 source address) - 4 consecutive bytes. */
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{
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/* rte_flow uses a bit mask for IPv4 addresses */
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.type = RTE_ACL_FIELD_TYPE_BITMASK,
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.size = sizeof(uint32_t),
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.field_index = SRC_FIELD_IPV4,
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.input_index = SRC_INPUT_IPV4,
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.offset = sizeof(struct rte_ether_hdr) +
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offsetof(struct rte_ipv4_hdr, src_addr),
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},
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/* next input field (IPv4 destination address) - 4 consecutive bytes. */
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{
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/* rte_flow uses a bit mask for IPv4 addresses */
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.type = RTE_ACL_FIELD_TYPE_BITMASK,
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.size = sizeof(uint32_t),
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.field_index = DST_FIELD_IPV4,
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.input_index = DST_INPUT_IPV4,
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.offset = sizeof(struct rte_ether_hdr) +
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offsetof(struct rte_ipv4_hdr, dst_addr),
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},
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/*
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* Next 2 fields (src & dst ports) form 4 consecutive bytes.
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* They share the same input index.
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*/
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{
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/* rte_flow uses a bit mask for protocol ports */
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.type = RTE_ACL_FIELD_TYPE_BITMASK,
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.size = sizeof(uint16_t),
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.field_index = SRCP_FIELD_IPV4,
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.input_index = SRCP_DESTP_INPUT_IPV4,
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.offset = sizeof(struct rte_ether_hdr) +
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sizeof(struct rte_ipv4_hdr) +
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offsetof(struct rte_tcp_hdr, src_port),
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},
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{
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/* rte_flow uses a bit mask for protocol ports */
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.type = RTE_ACL_FIELD_TYPE_BITMASK,
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.size = sizeof(uint16_t),
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.field_index = DSTP_FIELD_IPV4,
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.input_index = SRCP_DESTP_INPUT_IPV4,
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.offset = sizeof(struct rte_ether_hdr) +
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sizeof(struct rte_ipv4_hdr) +
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offsetof(struct rte_tcp_hdr, dst_port),
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},
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};
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The Main Function
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~~~~~~~~~~~~~~~~~
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The ``main()`` function performs the initialization and calls the execution
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threads for each lcore.
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The first task is to initialize the Environment Abstraction Layer (EAL).
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The ``argc`` and ``argv`` arguments are provided to the ``rte_eal_init()``
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function. The value returned is the number of parsed arguments:
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.. code-block:: c
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int ret = rte_eal_init(argc, argv);
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if (ret < 0)
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rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
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It then parses the flow_classify application arguments
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.. code-block:: c
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ret = parse_args(argc, argv);
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if (ret < 0)
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rte_exit(EXIT_FAILURE, "Invalid flow_classify parameters\n");
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The ``main()`` function also allocates a mempool to hold the mbufs
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(Message Buffers) used by the application:
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.. code-block:: c
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mbuf_pool = rte_mempool_create("MBUF_POOL",
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NUM_MBUFS * nb_ports,
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MBUF_SIZE,
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MBUF_CACHE_SIZE,
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sizeof(struct rte_pktmbuf_pool_private),
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rte_pktmbuf_pool_init, NULL,
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rte_pktmbuf_init, NULL,
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rte_socket_id(),
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0);
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mbufs are the packet buffer structure used by DPDK. They are explained in
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detail in the "Mbuf Library" section of the *DPDK Programmer's Guide*.
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The ``main()`` function also initializes all the ports using the user defined
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``port_init()`` function which is explained in the next section:
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.. code-block:: c
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RTE_ETH_FOREACH_DEV(portid) {
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if (port_init(portid, mbuf_pool) != 0) {
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rte_exit(EXIT_FAILURE,
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"Cannot init port %" PRIu8 "\n", portid);
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}
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}
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The ``main()`` function creates the ``flow classifier object`` and adds an ``ACL
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table`` to the flow classifier.
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.. code-block:: c
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struct flow_classifier {
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struct rte_flow_classifier *cls;
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};
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struct flow_classifier_acl {
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struct flow_classifier cls;
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} __rte_cache_aligned;
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/* Memory allocation */
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size = RTE_CACHE_LINE_ROUNDUP(sizeof(struct flow_classifier_acl));
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cls_app = rte_zmalloc(NULL, size, RTE_CACHE_LINE_SIZE);
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if (cls_app == NULL)
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rte_exit(EXIT_FAILURE, "Cannot allocate classifier memory\n");
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cls_params.name = "flow_classifier";
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cls_params.socket_id = socket_id;
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cls_app->cls = rte_flow_classifier_create(&cls_params);
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if (cls_app->cls == NULL) {
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rte_free(cls_app);
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rte_exit(EXIT_FAILURE, "Cannot create classifier\n");
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}
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/* initialise ACL table params */
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table_acl_params.name = "table_acl_ipv4_5tuple";
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table_acl_params.n_rule_fields = RTE_DIM(ipv4_defs);
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table_acl_params.n_rules = FLOW_CLASSIFY_MAX_RULE_NUM;
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memcpy(table_acl_params.field_format, ipv4_defs, sizeof(ipv4_defs));
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/* initialise table create params */
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cls_table_params.ops = &rte_table_acl_ops,
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cls_table_params.arg_create = &table_acl_params,
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cls_table_params.type = RTE_FLOW_CLASSIFY_TABLE_ACL_IP4_5TUPLE;
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ret = rte_flow_classify_table_create(cls_app->cls, &cls_table_params);
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if (ret) {
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rte_flow_classifier_free(cls_app->cls);
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rte_free(cls);
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rte_exit(EXIT_FAILURE, "Failed to create classifier table\n");
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}
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It then reads the ipv4_rules_file.txt file and initialises the parameters for
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the ``rte_flow_classify_table_entry_add`` API.
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This API adds a rule to the ACL table.
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.. code-block:: c
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if (add_rules(parm_config.rule_ipv4_name)) {
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rte_flow_classifier_free(cls_app->cls);
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rte_free(cls_app);
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rte_exit(EXIT_FAILURE, "Failed to add rules\n");
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}
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Once the initialization is complete, the application is ready to launch a
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function on an lcore. In this example ``lcore_main()`` is called on a single
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lcore.
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.. code-block:: c
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lcore_main(cls_app);
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The ``lcore_main()`` function is explained below.
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The Port Initialization Function
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The main functional part of the port initialization used in the Basic
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Forwarding application is shown below:
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.. code-block:: c
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static inline int
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port_init(uint8_t port, struct rte_mempool *mbuf_pool)
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{
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struct rte_eth_conf port_conf = port_conf_default;
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const uint16_t rx_rings = 1, tx_rings = 1;
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struct rte_ether_addr addr;
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int retval;
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uint16_t q;
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/* Configure the Ethernet device. */
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retval = rte_eth_dev_configure(port, rx_rings, tx_rings, &port_conf);
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if (retval != 0)
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return retval;
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/* Allocate and set up 1 RX queue per Ethernet port. */
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for (q = 0; q < rx_rings; q++) {
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retval = rte_eth_rx_queue_setup(port, q, RX_RING_SIZE,
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rte_eth_dev_socket_id(port), NULL, mbuf_pool);
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if (retval < 0)
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return retval;
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}
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/* Allocate and set up 1 TX queue per Ethernet port. */
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for (q = 0; q < tx_rings; q++) {
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retval = rte_eth_tx_queue_setup(port, q, TX_RING_SIZE,
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rte_eth_dev_socket_id(port), NULL);
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if (retval < 0)
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return retval;
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}
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/* Start the Ethernet port. */
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retval = rte_eth_dev_start(port);
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if (retval < 0)
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return retval;
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/* Display the port MAC address. */
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retval = rte_eth_macaddr_get(port, &addr);
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if (retval < 0)
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return retval;
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printf("Port %u MAC: %02" PRIx8 " %02" PRIx8 " %02" PRIx8
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" %02" PRIx8 " %02" PRIx8 " %02" PRIx8 "\n",
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port,
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addr.addr_bytes[0], addr.addr_bytes[1],
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addr.addr_bytes[2], addr.addr_bytes[3],
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addr.addr_bytes[4], addr.addr_bytes[5]);
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/* Enable RX in promiscuous mode for the Ethernet device. */
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retval = rte_eth_promiscuous_enable(port);
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if (retval != 0)
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return retval;
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return 0;
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}
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The Ethernet ports are configured with default settings using the
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``rte_eth_dev_configure()`` function and the ``port_conf_default`` struct.
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.. code-block:: c
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static const struct rte_eth_conf port_conf_default = {
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.rxmode = { .max_rx_pkt_len = RTE_ETHER_MAX_LEN }
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};
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For this example the ports are set up with 1 RX and 1 TX queue using the
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``rte_eth_rx_queue_setup()`` and ``rte_eth_tx_queue_setup()`` functions.
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The Ethernet port is then started:
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.. code-block:: c
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retval = rte_eth_dev_start(port);
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Finally the RX port is set in promiscuous mode:
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.. code-block:: c
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retval = rte_eth_promiscuous_enable(port);
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The Add Rules function
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~~~~~~~~~~~~~~~~~~~~~~
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The ``add_rules`` function reads the ``ipv4_rules_file.txt`` file and calls the
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``add_classify_rule`` function which calls the
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``rte_flow_classify_table_entry_add`` API.
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.. code-block:: c
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static int
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add_rules(const char *rule_path)
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{
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FILE *fh;
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char buff[LINE_MAX];
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unsigned int i = 0;
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unsigned int total_num = 0;
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struct rte_eth_ntuple_filter ntuple_filter;
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fh = fopen(rule_path, "rb");
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if (fh == NULL)
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rte_exit(EXIT_FAILURE, "%s: Open %s failed\n", __func__,
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rule_path);
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fseek(fh, 0, SEEK_SET);
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i = 0;
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while (fgets(buff, LINE_MAX, fh) != NULL) {
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i++;
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if (is_bypass_line(buff))
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continue;
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if (total_num >= FLOW_CLASSIFY_MAX_RULE_NUM - 1) {
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printf("\nINFO: classify rule capacity %d reached\n",
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total_num);
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break;
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}
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if (parse_ipv4_5tuple_rule(buff, &ntuple_filter) != 0)
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rte_exit(EXIT_FAILURE,
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"%s Line %u: parse rules error\n",
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rule_path, i);
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if (add_classify_rule(&ntuple_filter) != 0)
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rte_exit(EXIT_FAILURE, "add rule error\n");
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total_num++;
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}
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fclose(fh);
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return 0;
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}
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The Lcore Main function
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~~~~~~~~~~~~~~~~~~~~~~~
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As we saw above the ``main()`` function calls an application function on the
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available lcores.
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The ``lcore_main`` function calls the ``rte_flow_classifier_query`` API.
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For the Basic Forwarding application the ``lcore_main`` function looks like the
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following:
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.. code-block:: c
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/* flow classify data */
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static int num_classify_rules;
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static struct rte_flow_classify_rule *rules[MAX_NUM_CLASSIFY];
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static struct rte_flow_classify_ipv4_5tuple_stats ntuple_stats;
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static struct rte_flow_classify_stats classify_stats = {
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.stats = (void *)&ntuple_stats
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};
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static __rte_noreturn void
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lcore_main(cls_app)
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{
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uint16_t port;
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/*
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* Check that the port is on the same NUMA node as the polling thread
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* for best performance.
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*/
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RTE_ETH_FOREACH_DEV(port)
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if (rte_eth_dev_socket_id(port) > 0 &&
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rte_eth_dev_socket_id(port) != (int)rte_socket_id()) {
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printf("\n\n");
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printf("WARNING: port %u is on remote NUMA node\n",
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port);
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printf("to polling thread.\n");
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printf("Performance will not be optimal.\n");
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printf("\nCore %u forwarding packets. \n",
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rte_lcore_id());
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printf("[Ctrl+C to quit]\n
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}
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/* Run until the application is quit or killed. */
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for (;;) {
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/*
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* Receive packets on a port and forward them on the paired
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* port. The mapping is 0 -> 1, 1 -> 0, 2 -> 3, 3 -> 2, etc.
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*/
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RTE_ETH_FOREACH_DEV(port) {
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/* Get burst of RX packets, from first port of pair. */
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struct rte_mbuf *bufs[BURST_SIZE];
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const uint16_t nb_rx = rte_eth_rx_burst(port, 0,
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bufs, BURST_SIZE);
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if (unlikely(nb_rx == 0))
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continue;
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for (i = 0; i < MAX_NUM_CLASSIFY; i++) {
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if (rules[i]) {
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ret = rte_flow_classifier_query(
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cls_app->cls,
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bufs, nb_rx, rules[i],
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&classify_stats);
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if (ret)
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printf(
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"rule [%d] query failed ret [%d]\n\n",
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i, ret);
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else {
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printf(
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"rule[%d] count=%"PRIu64"\n",
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i, ntuple_stats.counter1);
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printf("proto = %d\n",
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ntuple_stats.ipv4_5tuple.proto);
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}
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}
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}
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/* Send burst of TX packets, to second port of pair. */
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const uint16_t nb_tx = rte_eth_tx_burst(port ^ 1, 0,
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bufs, nb_rx);
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/* Free any unsent packets. */
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if (unlikely(nb_tx < nb_rx)) {
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uint16_t buf;
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for (buf = nb_tx; buf < nb_rx; buf++)
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rte_pktmbuf_free(bufs[buf]);
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}
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}
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}
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}
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The main work of the application is done within the loop:
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.. code-block:: c
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for (;;) {
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RTE_ETH_FOREACH_DEV(port) {
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/* Get burst of RX packets, from first port of pair. */
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struct rte_mbuf *bufs[BURST_SIZE];
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const uint16_t nb_rx = rte_eth_rx_burst(port, 0,
|
|
bufs, BURST_SIZE);
|
|
|
|
if (unlikely(nb_rx == 0))
|
|
continue;
|
|
|
|
/* Send burst of TX packets, to second port of pair. */
|
|
const uint16_t nb_tx = rte_eth_tx_burst(port ^ 1, 0,
|
|
bufs, nb_rx);
|
|
|
|
/* Free any unsent packets. */
|
|
if (unlikely(nb_tx < nb_rx)) {
|
|
uint16_t buf;
|
|
for (buf = nb_tx; buf < nb_rx; buf++)
|
|
rte_pktmbuf_free(bufs[buf]);
|
|
}
|
|
}
|
|
}
|
|
|
|
Packets are received in bursts on the RX ports and transmitted in bursts on
|
|
the TX ports. The ports are grouped in pairs with a simple mapping scheme
|
|
using the an XOR on the port number::
|
|
|
|
0 -> 1
|
|
1 -> 0
|
|
|
|
2 -> 3
|
|
3 -> 2
|
|
|
|
etc.
|
|
|
|
The ``rte_eth_tx_burst()`` function frees the memory buffers of packets that
|
|
are transmitted. If packets fail to transmit, ``(nb_tx < nb_rx)``, then they
|
|
must be freed explicitly using ``rte_pktmbuf_free()``.
|
|
|
|
The forwarding loop can be interrupted and the application closed using
|
|
``Ctrl-C``.
|