DPDK: Data Plane Development Kit

18.08.0-rc1
examples/server_node_efd/node/node.c
/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2016-2017 Intel Corporation
*/
#include <stdint.h>
#include <stdio.h>
#include <inttypes.h>
#include <stdarg.h>
#include <errno.h>
#include <sys/queue.h>
#include <stdlib.h>
#include <getopt.h>
#include <string.h>
#include <rte_common.h>
#include <rte_malloc.h>
#include <rte_memory.h>
#include <rte_memzone.h>
#include <rte_eal.h>
#include <rte_atomic.h>
#include <rte_log.h>
#include <rte_per_lcore.h>
#include <rte_launch.h>
#include <rte_lcore.h>
#include <rte_ring.h>
#include <rte_debug.h>
#include <rte_mempool.h>
#include <rte_mbuf.h>
#include <rte_interrupts.h>
#include <rte_ether.h>
#include <rte_ethdev.h>
#include <rte_string_fns.h>
#include <rte_ip.h>
#include "common.h"
/* Number of packets to attempt to read from queue */
#define PKT_READ_SIZE ((uint16_t)32)
/*
* Our node id number - tells us which rx queue to read, and NIC TX
* queue to write to.
*/
static uint8_t node_id;
#define MBQ_CAPACITY 32
/* maps input ports to output ports for packets */
static uint16_t output_ports[RTE_MAX_ETHPORTS];
/* buffers up a set of packet that are ready to send */
struct rte_eth_dev_tx_buffer *tx_buffer[RTE_MAX_ETHPORTS];
/* shared data from server. We update statistics here */
static struct tx_stats *tx_stats;
static struct filter_stats *filter_stats;
/*
* print a usage message
*/
static void
usage(const char *progname)
{
printf("Usage: %s [EAL args] -- -n <node_id>\n\n", progname);
}
/*
* Convert the node id number from a string to an int.
*/
static int
parse_node_num(const char *node)
{
char *end = NULL;
unsigned long temp;
if (node == NULL || *node == '\0')
return -1;
temp = strtoul(node, &end, 10);
if (end == NULL || *end != '\0')
return -1;
node_id = (uint8_t)temp;
return 0;
}
/*
* Parse the application arguments to the node app.
*/
static int
parse_app_args(int argc, char *argv[])
{
int option_index, opt;
char **argvopt = argv;
const char *progname = NULL;
static struct option lgopts[] = { /* no long options */
{NULL, 0, 0, 0 }
};
progname = argv[0];
while ((opt = getopt_long(argc, argvopt, "n:", lgopts,
&option_index)) != EOF) {
switch (opt) {
case 'n':
if (parse_node_num(optarg) != 0) {
usage(progname);
return -1;
}
break;
default:
usage(progname);
return -1;
}
}
return 0;
}
/*
* Tx buffer error callback
*/
static void
flush_tx_error_callback(struct rte_mbuf **unsent, uint16_t count,
void *userdata) {
int i;
uint16_t port_id = (uintptr_t)userdata;
tx_stats->tx_drop[port_id] += count;
/* free the mbufs which failed from transmit */
for (i = 0; i < count; i++)
rte_pktmbuf_free(unsent[i]);
}
static void
configure_tx_buffer(uint16_t port_id, uint16_t size)
{
int ret;
/* Initialize TX buffers */
tx_buffer[port_id] = rte_zmalloc_socket("tx_buffer",
if (tx_buffer[port_id] == NULL)
rte_exit(EXIT_FAILURE,
"Cannot allocate buffer for tx on port %u\n", port_id);
rte_eth_tx_buffer_init(tx_buffer[port_id], size);
ret = rte_eth_tx_buffer_set_err_callback(tx_buffer[port_id],
flush_tx_error_callback, (void *)(intptr_t)port_id);
if (ret < 0)
rte_exit(EXIT_FAILURE,
"Cannot set error callback for tx buffer on port %u\n",
port_id);
}
/*
* set up output ports so that all traffic on port gets sent out
* its paired port. Index using actual port numbers since that is
* what comes in the mbuf structure.
*/
static void
configure_output_ports(const struct shared_info *info)
{
int i;
if (info->num_ports > RTE_MAX_ETHPORTS)
rte_exit(EXIT_FAILURE, "Too many ethernet ports. "
"RTE_MAX_ETHPORTS = %u\n",
(unsigned int)RTE_MAX_ETHPORTS);
for (i = 0; i < info->num_ports - 1; i += 2) {
uint8_t p1 = info->id[i];
uint8_t p2 = info->id[i+1];
output_ports[p1] = p2;
output_ports[p2] = p1;
configure_tx_buffer(p1, MBQ_CAPACITY);
configure_tx_buffer(p2, MBQ_CAPACITY);
}
}
/*
* Create the hash table that will contain the flows that
* the node will handle, which will be used to decide if packet
* is transmitted or dropped.
*/
static struct rte_hash *
create_hash_table(const struct shared_info *info)
{
uint32_t num_flows_node = info->num_flows / info->num_nodes;
struct rte_hash *h;
/* create table */
struct rte_hash_parameters hash_params = {
.entries = num_flows_node * 2, /* table load = 50% */
.key_len = sizeof(uint32_t), /* Store IPv4 dest IP address */
.hash_func_init_val = 0,
};
snprintf(name, sizeof(name), "hash_table_%d", node_id);
hash_params.name = name;
h = rte_hash_create(&hash_params);
if (h == NULL)
rte_exit(EXIT_FAILURE,
"Problem creating the hash table for node %d\n",
node_id);
return h;
}
static void
populate_hash_table(const struct rte_hash *h, const struct shared_info *info)
{
unsigned int i;
int32_t ret;
uint32_t ip_dst;
uint32_t num_flows_node = 0;
uint64_t target_node;
/* Add flows in table */
for (i = 0; i < info->num_flows; i++) {
target_node = i % info->num_nodes;
if (target_node != node_id)
continue;
ip_dst = rte_cpu_to_be_32(i);
ret = rte_hash_add_key(h, (void *) &ip_dst);
if (ret < 0)
rte_exit(EXIT_FAILURE, "Unable to add entry %u "
"in hash table\n", i);
else
num_flows_node++;
}
printf("Hash table: Adding 0x%x keys\n", num_flows_node);
}
/*
* This function performs routing of packets
* Just sends each input packet out an output port based solely on the input
* port it arrived on.
*/
static inline void
transmit_packet(struct rte_mbuf *buf)
{
int sent;
const uint16_t in_port = buf->port;
const uint16_t out_port = output_ports[in_port];
struct rte_eth_dev_tx_buffer *buffer = tx_buffer[out_port];
sent = rte_eth_tx_buffer(out_port, node_id, buffer, buf);
if (sent)
tx_stats->tx[out_port] += sent;
}
static inline void
handle_packets(struct rte_hash *h, struct rte_mbuf **bufs, uint16_t num_packets)
{
struct ipv4_hdr *ipv4_hdr;
uint32_t ipv4_dst_ip[PKT_READ_SIZE];
const void *key_ptrs[PKT_READ_SIZE];
unsigned int i;
int32_t positions[PKT_READ_SIZE] = {0};
for (i = 0; i < num_packets; i++) {
/* Handle IPv4 header.*/
ipv4_hdr = rte_pktmbuf_mtod_offset(bufs[i], struct ipv4_hdr *,
sizeof(struct ether_hdr));
ipv4_dst_ip[i] = ipv4_hdr->dst_addr;
key_ptrs[i] = &ipv4_dst_ip[i];
}
/* Check if packets belongs to any flows handled by this node */
rte_hash_lookup_bulk(h, key_ptrs, num_packets, positions);
for (i = 0; i < num_packets; i++) {
if (likely(positions[i] >= 0)) {
filter_stats->passed++;
transmit_packet(bufs[i]);
} else {
filter_stats->drop++;
/* Drop packet, as flow is not handled by this node */
rte_pktmbuf_free(bufs[i]);
}
}
}
/*
* Application main function - loops through
* receiving and processing packets. Never returns
*/
int
main(int argc, char *argv[])
{
const struct rte_memzone *mz;
struct rte_ring *rx_ring;
struct rte_hash *h;
struct rte_mempool *mp;
struct shared_info *info;
int need_flush = 0; /* indicates whether we have unsent packets */
int retval;
void *pkts[PKT_READ_SIZE];
uint16_t sent;
retval = rte_eal_init(argc, argv);
if (retval < 0)
return -1;
argc -= retval;
argv += retval;
if (parse_app_args(argc, argv) < 0)
rte_exit(EXIT_FAILURE, "Invalid command-line arguments\n");
rte_exit(EXIT_FAILURE, "No Ethernet ports - bye\n");
rx_ring = rte_ring_lookup(get_rx_queue_name(node_id));
if (rx_ring == NULL)
rte_exit(EXIT_FAILURE, "Cannot get RX ring - "
"is server process running?\n");
mp = rte_mempool_lookup(PKTMBUF_POOL_NAME);
if (mp == NULL)
rte_exit(EXIT_FAILURE, "Cannot get mempool for mbufs\n");
mz = rte_memzone_lookup(MZ_SHARED_INFO);
if (mz == NULL)
rte_exit(EXIT_FAILURE, "Cannot get port info structure\n");
info = mz->addr;
tx_stats = &(info->tx_stats[node_id]);
filter_stats = &(info->filter_stats[node_id]);
configure_output_ports(info);
h = create_hash_table(info);
populate_hash_table(h, info);
RTE_LOG(INFO, APP, "Finished Process Init.\n");
printf("\nNode process %d handling packets\n", node_id);
printf("[Press Ctrl-C to quit ...]\n");
for (;;) {
uint16_t rx_pkts = PKT_READ_SIZE;
uint16_t port;
/*
* Try dequeuing max possible packets first, if that fails,
* get the most we can. Loop body should only execute once,
* maximum
*/
while (rx_pkts > 0 &&
rx_pkts, NULL) == 0))
rx_pkts = (uint16_t)RTE_MIN(rte_ring_count(rx_ring),
PKT_READ_SIZE);
if (unlikely(rx_pkts == 0)) {
if (need_flush)
for (port = 0; port < info->num_ports; port++) {
info->id[port],
node_id,
tx_buffer[port]);
if (unlikely(sent))
tx_stats->tx[port] += sent;
}
need_flush = 0;
continue;
}
handle_packets(h, (struct rte_mbuf **)pkts, rx_pkts);
need_flush = 1;
}
}