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395
dpdk/examples/server_node_efd/node/node.c
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395
dpdk/examples/server_node_efd/node/node.c
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/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2016-2017 Intel Corporation
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <inttypes.h>
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#include <stdarg.h>
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#include <errno.h>
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#include <sys/queue.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include <string.h>
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#include <rte_common.h>
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#include <rte_malloc.h>
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#include <rte_memory.h>
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#include <rte_memzone.h>
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#include <rte_eal.h>
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#include <rte_branch_prediction.h>
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#include <rte_log.h>
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#include <rte_per_lcore.h>
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#include <rte_launch.h>
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#include <rte_lcore.h>
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#include <rte_ring.h>
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#include <rte_debug.h>
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#include <rte_mempool.h>
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#include <rte_mbuf.h>
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#include <rte_interrupts.h>
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#include <rte_ether.h>
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#include <rte_ethdev.h>
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#include <rte_string_fns.h>
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#include <rte_ip.h>
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#include "common.h"
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/* Number of packets to attempt to read from queue */
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#define PKT_READ_SIZE ((uint16_t)32)
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/*
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* Our node id number - tells us which rx queue to read, and NIC TX
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* queue to write to.
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*/
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static uint8_t node_id;
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#define MBQ_CAPACITY 32
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/* maps input ports to output ports for packets */
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static uint16_t output_ports[RTE_MAX_ETHPORTS];
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/* buffers up a set of packet that are ready to send */
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struct rte_eth_dev_tx_buffer *tx_buffer[RTE_MAX_ETHPORTS];
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/* shared data from server. We update statistics here */
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static struct tx_stats *tx_stats;
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static struct filter_stats *filter_stats;
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/*
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* print a usage message
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*/
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static void
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usage(const char *progname)
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{
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printf("Usage: %s [EAL args] -- -n <node_id>\n\n", progname);
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}
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/*
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* Convert the node id number from a string to an int.
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*/
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static int
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parse_node_num(const char *node)
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{
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char *end = NULL;
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unsigned long temp;
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if (node == NULL || *node == '\0')
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return -1;
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temp = strtoul(node, &end, 10);
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if (end == NULL || *end != '\0')
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return -1;
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node_id = (uint8_t)temp;
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return 0;
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}
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/*
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* Parse the application arguments to the node app.
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*/
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static int
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parse_app_args(int argc, char *argv[])
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{
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int option_index, opt;
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char **argvopt = argv;
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const char *progname = NULL;
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static struct option lgopts[] = { /* no long options */
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{NULL, 0, 0, 0 }
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};
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progname = argv[0];
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while ((opt = getopt_long(argc, argvopt, "n:", lgopts,
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&option_index)) != EOF) {
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switch (opt) {
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case 'n':
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if (parse_node_num(optarg) != 0) {
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usage(progname);
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return -1;
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}
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break;
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default:
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usage(progname);
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return -1;
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}
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}
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return 0;
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}
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/*
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* Tx buffer error callback
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*/
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static void
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flush_tx_error_callback(struct rte_mbuf **unsent, uint16_t count,
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void *userdata) {
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int i;
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uint16_t port_id = (uintptr_t)userdata;
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tx_stats->tx_drop[port_id] += count;
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/* free the mbufs which failed from transmit */
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for (i = 0; i < count; i++)
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rte_pktmbuf_free(unsent[i]);
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}
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static void
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configure_tx_buffer(uint16_t port_id, uint16_t size)
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{
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int ret;
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/* Initialize TX buffers */
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tx_buffer[port_id] = rte_zmalloc_socket("tx_buffer",
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RTE_ETH_TX_BUFFER_SIZE(size), 0,
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rte_eth_dev_socket_id(port_id));
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if (tx_buffer[port_id] == NULL)
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rte_exit(EXIT_FAILURE,
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"Cannot allocate buffer for tx on port %u\n", port_id);
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rte_eth_tx_buffer_init(tx_buffer[port_id], size);
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ret = rte_eth_tx_buffer_set_err_callback(tx_buffer[port_id],
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flush_tx_error_callback, (void *)(intptr_t)port_id);
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if (ret < 0)
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rte_exit(EXIT_FAILURE,
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"Cannot set error callback for tx buffer on port %u\n",
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port_id);
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}
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/*
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* set up output ports so that all traffic on port gets sent out
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* its paired port. Index using actual port numbers since that is
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* what comes in the mbuf structure.
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*/
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static void
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configure_output_ports(const struct shared_info *info)
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{
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int i;
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if (info->num_ports > RTE_MAX_ETHPORTS)
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rte_exit(EXIT_FAILURE, "Too many ethernet ports. "
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"RTE_MAX_ETHPORTS = %u\n",
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(unsigned int)RTE_MAX_ETHPORTS);
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for (i = 0; i < info->num_ports - 1; i += 2) {
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uint8_t p1 = info->id[i];
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uint8_t p2 = info->id[i+1];
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output_ports[p1] = p2;
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output_ports[p2] = p1;
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configure_tx_buffer(p1, MBQ_CAPACITY);
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configure_tx_buffer(p2, MBQ_CAPACITY);
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}
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}
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/*
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* Create the hash table that will contain the flows that
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* the node will handle, which will be used to decide if packet
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* is transmitted or dropped.
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*/
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/* Creation of hash table. 8< */
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static struct rte_hash *
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create_hash_table(const struct shared_info *info)
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{
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uint32_t num_flows_node = info->num_flows / info->num_nodes;
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char name[RTE_HASH_NAMESIZE];
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struct rte_hash *h;
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/* create table */
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struct rte_hash_parameters hash_params = {
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.entries = num_flows_node * 2, /* table load = 50% */
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.key_len = sizeof(uint32_t), /* Store IPv4 dest IP address */
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.socket_id = rte_socket_id(),
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.hash_func_init_val = 0,
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};
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snprintf(name, sizeof(name), "hash_table_%d", node_id);
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hash_params.name = name;
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h = rte_hash_create(&hash_params);
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if (h == NULL)
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rte_exit(EXIT_FAILURE,
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"Problem creating the hash table for node %d\n",
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node_id);
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return h;
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}
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static void
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populate_hash_table(const struct rte_hash *h, const struct shared_info *info)
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{
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unsigned int i;
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int32_t ret;
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uint32_t ip_dst;
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uint32_t num_flows_node = 0;
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uint64_t target_node;
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/* Add flows in table */
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for (i = 0; i < info->num_flows; i++) {
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target_node = i % info->num_nodes;
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if (target_node != node_id)
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continue;
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ip_dst = rte_cpu_to_be_32(i);
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ret = rte_hash_add_key(h, (void *) &ip_dst);
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if (ret < 0)
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rte_exit(EXIT_FAILURE, "Unable to add entry %u "
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"in hash table\n", i);
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else
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num_flows_node++;
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}
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printf("Hash table: Adding 0x%x keys\n", num_flows_node);
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}
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/* >8 End of creation of hash table. */
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/*
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* This function performs routing of packets
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* Just sends each input packet out an output port based solely on the input
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* port it arrived on.
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*/
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static inline void
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transmit_packet(struct rte_mbuf *buf)
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{
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int sent;
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const uint16_t in_port = buf->port;
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const uint16_t out_port = output_ports[in_port];
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struct rte_eth_dev_tx_buffer *buffer = tx_buffer[out_port];
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sent = rte_eth_tx_buffer(out_port, node_id, buffer, buf);
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if (sent)
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tx_stats->tx[out_port] += sent;
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}
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/* Packets dequeued from the shared ring. 8< */
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static inline void
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handle_packets(struct rte_hash *h, struct rte_mbuf **bufs, uint16_t num_packets)
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{
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struct rte_ipv4_hdr *ipv4_hdr;
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uint32_t ipv4_dst_ip[PKT_READ_SIZE];
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const void *key_ptrs[PKT_READ_SIZE];
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unsigned int i;
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int32_t positions[PKT_READ_SIZE] = {0};
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for (i = 0; i < num_packets; i++) {
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/* Handle IPv4 header.*/
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ipv4_hdr = rte_pktmbuf_mtod_offset(bufs[i],
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struct rte_ipv4_hdr *, sizeof(struct rte_ether_hdr));
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ipv4_dst_ip[i] = ipv4_hdr->dst_addr;
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key_ptrs[i] = &ipv4_dst_ip[i];
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}
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/* Check if packets belongs to any flows handled by this node */
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rte_hash_lookup_bulk(h, key_ptrs, num_packets, positions);
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for (i = 0; i < num_packets; i++) {
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if (likely(positions[i] >= 0)) {
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filter_stats->passed++;
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transmit_packet(bufs[i]);
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} else {
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filter_stats->drop++;
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/* Drop packet, as flow is not handled by this node */
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rte_pktmbuf_free(bufs[i]);
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}
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}
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}
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/* >8 End of packets dequeuing. */
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/*
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* Application main function - loops through
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* receiving and processing packets. Never returns
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*/
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int
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main(int argc, char *argv[])
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{
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const struct rte_memzone *mz;
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struct rte_ring *rx_ring;
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struct rte_hash *h;
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struct rte_mempool *mp;
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struct shared_info *info;
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int need_flush = 0; /* indicates whether we have unsent packets */
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int retval;
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void *pkts[PKT_READ_SIZE];
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uint16_t sent;
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retval = rte_eal_init(argc, argv);
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if (retval < 0)
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return -1;
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argc -= retval;
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argv += retval;
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if (parse_app_args(argc, argv) < 0)
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rte_exit(EXIT_FAILURE, "Invalid command-line arguments\n");
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if (rte_eth_dev_count_avail() == 0)
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rte_exit(EXIT_FAILURE, "No Ethernet ports - bye\n");
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/* Attaching to the server process memory. 8< */
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rx_ring = rte_ring_lookup(get_rx_queue_name(node_id));
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if (rx_ring == NULL)
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rte_exit(EXIT_FAILURE, "Cannot get RX ring - "
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"is server process running?\n");
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mp = rte_mempool_lookup(PKTMBUF_POOL_NAME);
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if (mp == NULL)
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rte_exit(EXIT_FAILURE, "Cannot get mempool for mbufs\n");
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mz = rte_memzone_lookup(MZ_SHARED_INFO);
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if (mz == NULL)
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rte_exit(EXIT_FAILURE, "Cannot get port info structure\n");
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info = mz->addr;
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tx_stats = &(info->tx_stats[node_id]);
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filter_stats = &(info->filter_stats[node_id]);
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/* >8 End of attaching to the server process memory. */
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configure_output_ports(info);
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h = create_hash_table(info);
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populate_hash_table(h, info);
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RTE_LOG(INFO, APP, "Finished Process Init.\n");
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printf("\nNode process %d handling packets\n", node_id);
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printf("[Press Ctrl-C to quit ...]\n");
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for (;;) {
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uint16_t rx_pkts = PKT_READ_SIZE;
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uint16_t port;
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/*
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* Try dequeuing max possible packets first, if that fails,
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* get the most we can. Loop body should only execute once,
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* maximum
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*/
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while (rx_pkts > 0 &&
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unlikely(rte_ring_dequeue_bulk(rx_ring, pkts,
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rx_pkts, NULL) == 0))
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rx_pkts = (uint16_t)RTE_MIN(rte_ring_count(rx_ring),
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PKT_READ_SIZE);
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if (unlikely(rx_pkts == 0)) {
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if (need_flush)
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for (port = 0; port < info->num_ports; port++) {
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sent = rte_eth_tx_buffer_flush(
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info->id[port],
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node_id,
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tx_buffer[port]);
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if (unlikely(sent))
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tx_stats->tx[port] += sent;
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}
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need_flush = 0;
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continue;
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}
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handle_packets(h, (struct rte_mbuf **)pkts, rx_pkts);
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need_flush = 1;
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}
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/* clean up the EAL */
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rte_eal_cleanup();
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}
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