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+.. BSD LICENSE
+ Copyright(c) 2017 Intel Corporation. All rights reserved.
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+ * Neither the name of Intel Corporation nor the names of its
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+Flow Classify Sample Application
+================================
+
+The Flow Classify sample application is based on the simple *skeleton* example
+of a forwarding application.
+
+It is intended as a demonstration of the basic components of a DPDK forwarding
+application which uses the Flow Classify library API's.
+
+Please refer to the
+:doc:`../prog_guide/flow_classify_lib`
+for more information.
+
+Compiling the Application
+-------------------------
+
+To compile the sample application see :doc:`compiling`.
+
+The application is located in the ``flow_classify`` sub-directory.
+
+Running the Application
+-----------------------
+
+To run the example in a ``linuxapp`` environment:
+
+.. code-block:: console
+
+ cd ~/dpdk/examples/flow_classify
+ ./build/flow_classify -c 4 -n 4 -- --rule_ipv4="../ipv4_rules_file.txt"
+
+Please refer to the *DPDK Getting Started Guide*, section
+:doc:`../linux_gsg/build_sample_apps`
+for general information on running applications and the Environment Abstraction
+Layer (EAL) options.
+
+
+Sample ipv4_rules_file.txt
+--------------------------
+
+.. code-block:: console
+
+ #file format:
+ #src_ip/masklen dst_ip/masklen src_port : mask dst_port : mask proto/mask priority
+ #
+ 2.2.2.3/24 2.2.2.7/24 32 : 0xffff 33 : 0xffff 17/0xff 0
+ 9.9.9.3/24 9.9.9.7/24 32 : 0xffff 33 : 0xffff 17/0xff 1
+ 9.9.9.3/24 9.9.9.7/24 32 : 0xffff 33 : 0xffff 6/0xff 2
+ 9.9.8.3/24 9.9.8.7/24 32 : 0xffff 33 : 0xffff 6/0xff 3
+ 6.7.8.9/24 2.3.4.5/24 32 : 0x0000 33 : 0x0000 132/0xff 4
+
+Explanation
+-----------
+
+The following sections provide an explanation of the main components of the
+code.
+
+All DPDK library functions used in the sample code are prefixed with ``rte_``
+and are explained in detail in the *DPDK API Documentation*.
+
+ACL field definitions for the IPv4 5 tuple rule
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The following field definitions are used when creating the ACL table during
+initialisation of the ``Flow Classify`` application..
+
+.. code-block:: c
+
+ enum {
+ PROTO_FIELD_IPV4,
+ SRC_FIELD_IPV4,
+ DST_FIELD_IPV4,
+ SRCP_FIELD_IPV4,
+ DSTP_FIELD_IPV4,
+ NUM_FIELDS_IPV4
+ };
+
+ enum {
+ PROTO_INPUT_IPV4,
+ SRC_INPUT_IPV4,
+ DST_INPUT_IPV4,
+ SRCP_DESTP_INPUT_IPV4
+ };
+
+ static struct rte_acl_field_def ipv4_defs[NUM_FIELDS_IPV4] = {
+ /* first input field - always one byte long. */
+ {
+ .type = RTE_ACL_FIELD_TYPE_BITMASK,
+ .size = sizeof(uint8_t),
+ .field_index = PROTO_FIELD_IPV4,
+ .input_index = PROTO_INPUT_IPV4,
+ .offset = sizeof(struct ether_hdr) +
+ offsetof(struct ipv4_hdr, next_proto_id),
+ },
+ /* next input field (IPv4 source address) - 4 consecutive bytes. */
+ {
+ /* rte_flow uses a bit mask for IPv4 addresses */
+ .type = RTE_ACL_FIELD_TYPE_BITMASK,
+ .size = sizeof(uint32_t),
+ .field_index = SRC_FIELD_IPV4,
+ .input_index = SRC_INPUT_IPV4,
+ .offset = sizeof(struct ether_hdr) +
+ offsetof(struct ipv4_hdr, src_addr),
+ },
+ /* next input field (IPv4 destination address) - 4 consecutive bytes. */
+ {
+ /* rte_flow uses a bit mask for IPv4 addresses */
+ .type = RTE_ACL_FIELD_TYPE_BITMASK,
+ .size = sizeof(uint32_t),
+ .field_index = DST_FIELD_IPV4,
+ .input_index = DST_INPUT_IPV4,
+ .offset = sizeof(struct ether_hdr) +
+ offsetof(struct ipv4_hdr, dst_addr),
+ },
+ /*
+ * Next 2 fields (src & dst ports) form 4 consecutive bytes.
+ * They share the same input index.
+ */
+ {
+ /* rte_flow uses a bit mask for protocol ports */
+ .type = RTE_ACL_FIELD_TYPE_BITMASK,
+ .size = sizeof(uint16_t),
+ .field_index = SRCP_FIELD_IPV4,
+ .input_index = SRCP_DESTP_INPUT_IPV4,
+ .offset = sizeof(struct ether_hdr) +
+ sizeof(struct ipv4_hdr) +
+ offsetof(struct tcp_hdr, src_port),
+ },
+ {
+ /* rte_flow uses a bit mask for protocol ports */
+ .type = RTE_ACL_FIELD_TYPE_BITMASK,
+ .size = sizeof(uint16_t),
+ .field_index = DSTP_FIELD_IPV4,
+ .input_index = SRCP_DESTP_INPUT_IPV4,
+ .offset = sizeof(struct ether_hdr) +
+ sizeof(struct ipv4_hdr) +
+ offsetof(struct tcp_hdr, dst_port),
+ },
+ };
+
+The Main Function
+~~~~~~~~~~~~~~~~~
+
+The ``main()`` function performs the initialization and calls the execution
+threads for each lcore.
+
+The first task is to initialize the Environment Abstraction Layer (EAL).
+The ``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");
+
+It then parses the flow_classify application arguments
+
+.. code-block:: c
+
+ ret = parse_args(argc, argv);
+ if (ret < 0)
+ rte_exit(EXIT_FAILURE, "Invalid flow_classify parameters\n");
+
+The ``main()`` function also allocates a mempool to hold the mbufs
+(Message Buffers) used by the application:
+
+.. code-block:: c
+
+ mbuf_pool = rte_mempool_create("MBUF_POOL",
+ NUM_MBUFS * nb_ports,
+ MBUF_SIZE,
+ MBUF_CACHE_SIZE,
+ sizeof(struct rte_pktmbuf_pool_private),
+ rte_pktmbuf_pool_init, NULL,
+ rte_pktmbuf_init, NULL,
+ rte_socket_id(),
+ 0);
+
+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 which is explained in the next section:
+
+.. code-block:: c
+
+ for (portid = 0; portid < nb_ports; portid++) {
+ if (port_init(portid, mbuf_pool) != 0) {
+ rte_exit(EXIT_FAILURE,
+ "Cannot init port %" PRIu8 "\n", portid);
+ }
+ }
+
+The ``main()`` function creates the ``flow classifier object`` and adds an ``ACL
+table`` to the flow classifier.
+
+.. code-block:: c
+
+ struct flow_classifier {
+ struct rte_flow_classifier *cls;
+ uint32_t table_id[RTE_FLOW_CLASSIFY_TABLE_MAX];
+ };
+
+ struct flow_classifier_acl {
+ struct flow_classifier cls;
+ } __rte_cache_aligned;
+
+ /* Memory allocation */
+ size = RTE_CACHE_LINE_ROUNDUP(sizeof(struct flow_classifier_acl));
+ cls_app = rte_zmalloc(NULL, size, RTE_CACHE_LINE_SIZE);
+ if (cls_app == NULL)
+ rte_exit(EXIT_FAILURE, "Cannot allocate classifier memory\n");
+
+ cls_params.name = "flow_classifier";
+ cls_params.socket_id = socket_id;
+ cls_params.type = RTE_FLOW_CLASSIFY_TABLE_TYPE_ACL;
+
+ cls_app->cls = rte_flow_classifier_create(&cls_params);
+ if (cls_app->cls == NULL) {
+ rte_free(cls_app);
+ rte_exit(EXIT_FAILURE, "Cannot create classifier\n");
+ }
+
+ /* initialise ACL table params */
+ table_acl_params.name = "table_acl_ipv4_5tuple";
+ table_acl_params.n_rule_fields = RTE_DIM(ipv4_defs);
+ table_acl_params.n_rules = FLOW_CLASSIFY_MAX_RULE_NUM;
+ memcpy(table_acl_params.field_format, ipv4_defs, sizeof(ipv4_defs));
+
+ /* initialise table create params */
+ cls_table_params.ops = &rte_table_acl_ops,
+ cls_table_params.arg_create = &table_acl_params,
+ cls_table_params.table_metadata_size = 0;
+
+ ret = rte_flow_classify_table_create(cls_app->cls, &cls_table_params,
+ &cls->table_id[0]);
+ if (ret) {
+ rte_flow_classifier_free(cls_app->cls);
+ rte_free(cls);
+ rte_exit(EXIT_FAILURE, "Failed to create classifier table\n");
+ }
+
+It then reads the ipv4_rules_file.txt file and initialises the parameters for
+the ``rte_flow_classify_table_entry_add`` API.
+This API adds a rule to the ACL table.
+
+.. code-block:: c
+
+ if (add_rules(parm_config.rule_ipv4_name)) {
+ rte_flow_classifier_free(cls_app->cls);
+ rte_free(cls_app);
+ rte_exit(EXIT_FAILURE, "Failed to add rules\n");
+ }
+
+Once the initialization is complete, the application is ready to launch a
+function on an lcore. In this example ``lcore_main()`` is called on a single
+lcore.
+
+.. code-block:: c
+
+ lcore_main(cls_app);
+
+The ``lcore_main()`` function is explained below.
+
+The Port Initialization Function
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The main functional part of the port initialization used in the Basic
+Forwarding application is shown below:
+
+.. code-block:: c
+
+ static inline int
+ port_init(uint8_t port, struct rte_mempool *mbuf_pool)
+ {
+ struct rte_eth_conf port_conf = port_conf_default;
+ const uint16_t rx_rings = 1, tx_rings = 1;
+ struct ether_addr addr;
+ int retval;
+ uint16_t q;
+
+ if (port >= rte_eth_dev_count())
+ return -1;
+
+ /* Configure the Ethernet device. */
+ retval = rte_eth_dev_configure(port, rx_rings, tx_rings, &port_conf);
+ if (retval != 0)
+ return retval;
+
+ /* Allocate and set up 1 RX queue per Ethernet port. */
+ for (q = 0; q < rx_rings; q++) {
+ retval = rte_eth_rx_queue_setup(port, q, RX_RING_SIZE,
+ rte_eth_dev_socket_id(port), NULL, mbuf_pool);
+ if (retval < 0)
+ return retval;
+ }
+
+ /* Allocate and set up 1 TX queue per Ethernet port. */
+ for (q = 0; q < tx_rings; q++) {
+ retval = rte_eth_tx_queue_setup(port, q, TX_RING_SIZE,
+ rte_eth_dev_socket_id(port), NULL);
+ if (retval < 0)
+ return retval;
+ }
+
+ /* Start the Ethernet port. */
+ retval = rte_eth_dev_start(port);
+ if (retval < 0)
+ return retval;
+
+ /* Display the port MAC address. */
+ rte_eth_macaddr_get(port, &addr);
+ printf("Port %u MAC: %02" PRIx8 " %02" PRIx8 " %02" PRIx8
+ " %02" PRIx8 " %02" PRIx8 " %02" PRIx8 "\n",
+ port,
+ addr.addr_bytes[0], addr.addr_bytes[1],
+ addr.addr_bytes[2], addr.addr_bytes[3],
+ addr.addr_bytes[4], addr.addr_bytes[5]);
+
+ /* Enable RX in promiscuous mode for the Ethernet device. */
+ rte_eth_promiscuous_enable(port);
+
+ return 0;
+ }
+
+The Ethernet ports are configured with default settings using the
+``rte_eth_dev_configure()`` function and the ``port_conf_default`` struct.
+
+.. code-block:: c
+
+ static const struct rte_eth_conf port_conf_default = {
+ .rxmode = { .max_rx_pkt_len = ETHER_MAX_LEN }
+ };
+
+For this example the ports are set up with 1 RX and 1 TX queue using the
+``rte_eth_rx_queue_setup()`` and ``rte_eth_tx_queue_setup()`` functions.
+
+The Ethernet port is then started:
+
+.. code-block:: c
+
+ retval = rte_eth_dev_start(port);
+
+
+Finally the RX port is set in promiscuous mode:
+
+.. code-block:: c
+
+ rte_eth_promiscuous_enable(port);
+
+The Add Rules function
+~~~~~~~~~~~~~~~~~~~~~~
+
+The ``add_rules`` function reads the ``ipv4_rules_file.txt`` file and calls the
+``add_classify_rule`` function which calls the
+``rte_flow_classify_table_entry_add`` API.
+
+.. code-block:: c
+
+ static int
+ add_rules(const char *rule_path)
+ {
+ FILE *fh;
+ char buff[LINE_MAX];
+ unsigned int i = 0;
+ unsigned int total_num = 0;
+ struct rte_eth_ntuple_filter ntuple_filter;
+
+ fh = fopen(rule_path, "rb");
+ if (fh == NULL)
+ rte_exit(EXIT_FAILURE, "%s: Open %s failed\n", __func__,
+ rule_path);
+
+ fseek(fh, 0, SEEK_SET);
+
+ i = 0;
+ while (fgets(buff, LINE_MAX, fh) != NULL) {
+ i++;
+
+ if (is_bypass_line(buff))
+ continue;
+
+ if (total_num >= FLOW_CLASSIFY_MAX_RULE_NUM - 1) {
+ printf("\nINFO: classify rule capacity %d reached\n",
+ total_num);
+ break;
+ }
+
+ if (parse_ipv4_5tuple_rule(buff, &ntuple_filter) != 0)
+ rte_exit(EXIT_FAILURE,
+ "%s Line %u: parse rules error\n",
+ rule_path, i);
+
+ if (add_classify_rule(&ntuple_filter) != 0)
+ rte_exit(EXIT_FAILURE, "add rule error\n");
+
+ total_num++;
+ }
+
+ fclose(fh);
+ return 0;
+ }
+
+
+The Lcore Main function
+~~~~~~~~~~~~~~~~~~~~~~~
+
+As we saw above the ``main()`` function calls an application function on the
+available lcores.
+The ``lcore_main`` function calls the ``rte_flow_classifier_query`` API.
+For the Basic Forwarding application the ``lcore_main`` function looks like the
+following:
+
+.. code-block:: c
+
+ /* flow classify data */
+ static int num_classify_rules;
+ static struct rte_flow_classify_rule *rules[MAX_NUM_CLASSIFY];
+ static struct rte_flow_classify_ipv4_5tuple_stats ntuple_stats;
+ static struct rte_flow_classify_stats classify_stats = {
+ .stats = (void *)&ntuple_stats
+ };
+
+ static __attribute__((noreturn)) void
+ lcore_main(cls_app)
+ {
+ const uint8_t nb_ports = rte_eth_dev_count();
+ uint8_t port;
+
+ /*
+ * Check that the port is on the same NUMA node as the polling thread
+ * for best performance.
+ */
+ for (port = 0; port < nb_ports; port++)
+ if (rte_eth_dev_socket_id(port) > 0 &&
+ rte_eth_dev_socket_id(port) != (int)rte_socket_id()) {
+ printf("\n\n");
+ printf("WARNING: port %u is on remote NUMA node\n",
+ port);
+ printf("to polling thread.\n");
+ printf("Performance will not be optimal.\n");
+
+ printf("\nCore %u forwarding packets. \n",
+ rte_lcore_id());
+ printf("[Ctrl+C to quit]\n
+ }
+
+ /* Run until the application is quit or killed. */
+ for (;;) {
+ /*
+ * Receive packets on a port and forward them on the paired
+ * port. The mapping is 0 -> 1, 1 -> 0, 2 -> 3, 3 -> 2, etc.
+ */
+ for (port = 0; port < nb_ports; port++) {
+
+ /* Get burst of RX packets, from first port of pair. */
+ struct rte_mbuf *bufs[BURST_SIZE];
+ const uint16_t nb_rx = rte_eth_rx_burst(port, 0,
+ bufs, BURST_SIZE);
+
+ if (unlikely(nb_rx == 0))
+ continue;
+
+ for (i = 0; i < MAX_NUM_CLASSIFY; i++) {
+ if (rules[i]) {
+ ret = rte_flow_classifier_query(
+ cls_app->cls,
+ cls_app->table_id[0],
+ bufs, nb_rx, rules[i],
+ &classify_stats);
+ if (ret)
+ printf(
+ "rule [%d] query failed ret [%d]\n\n",
+ i, ret);
+ else {
+ printf(
+ "rule[%d] count=%"PRIu64"\n",
+ i, ntuple_stats.counter1);
+
+ printf("proto = %d\n",
+ ntuple_stats.ipv4_5tuple.proto);
+ }
+ }
+ }
+
+ /* 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]);
+ }
+ }
+ }
+ }
+
+The main work of the application is done within the loop:
+
+.. code-block:: c
+
+ for (;;) {
+ for (port = 0; port < nb_ports; port++) {
+
+ /* Get burst of RX packets, from first port of pair. */
+ struct rte_mbuf *bufs[BURST_SIZE];
+ 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``.