#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/queue.h>
#include <netinet/in.h>
#include <setjmp.h>
#include <stdarg.h>
#include <ctype.h>
#include <errno.h>
#include <getopt.h>
#include <signal.h>
#include <stdbool.h>
#include <rte_common.h>
#include <rte_log.h>
#include <rte_malloc.h>
#include <rte_memory.h>
#include <rte_memcpy.h>
#include <rte_memzone.h>
#include <rte_eal.h>
#include <rte_per_lcore.h>
#include <rte_launch.h>
#include <rte_atomic.h>
#include <rte_cycles.h>
#include <rte_prefetch.h>
#include <rte_lcore.h>
#include <rte_per_lcore.h>
#include <rte_branch_prediction.h>
#include <rte_interrupts.h>
#include <rte_pci.h>
#include <rte_random.h>
#include <rte_debug.h>
#include <rte_ether.h>
#include <rte_ethdev.h>
#include <rte_mempool.h>
#include <rte_mbuf.h>
static volatile bool force_quit;
/* MAC updating enabled by default */
static int mac_updating = 1;
#define RTE_LOGTYPE_L2FWD RTE_LOGTYPE_USER1
#define NB_MBUF 8192
#define MAX_PKT_BURST 32
#define BURST_TX_DRAIN_US 100 /* TX drain every ~100us */
#define MEMPOOL_CACHE_SIZE 256
/*
* Configurable number of RX/TX ring descriptors
*/
#define RTE_TEST_RX_DESC_DEFAULT 128
#define RTE_TEST_TX_DESC_DEFAULT 512
static uint16_t nb_rxd = RTE_TEST_RX_DESC_DEFAULT;
static uint16_t nb_txd = RTE_TEST_TX_DESC_DEFAULT;
/* ethernet addresses of ports */
//端口的以太网地址
static struct ether_addr l2fwd_ports_eth_addr[RTE_MAX_ETHPORTS];
/* mask of enabled ports */
//启用端口的mask
static uint32_t l2fwd_enabled_port_mask = 0;
/* list of enabled ports */
//启用端口列表
static uint32_t l2fwd_dst_ports[RTE_MAX_ETHPORTS];
static unsigned int l2fwd_rx_queue_per_lcore = 1;
#define MAX_RX_QUEUE_PER_LCORE 16
#define MAX_TX_QUEUE_PER_PORT 16
struct lcore_queue_conf {
unsigned n_rx_port;
unsigned rx_port_list[MAX_RX_QUEUE_PER_LCORE];
} __rte_cache_aligned;
struct lcore_queue_conf lcore_queue_conf[RTE_MAX_LCORE];
static struct rte_eth_dev_tx_buffer *tx_buffer[RTE_MAX_ETHPORTS];
static const struct rte_eth_conf port_conf = {
.rxmode = {
.split_hdr_size = 0,
.header_split = 0, /**< Header Split disabled */ //报头分离
.hw_ip_checksum = 0, /**< IP checksum offload disabled */ //IP校验和卸载
.hw_vlan_filter = 0, /**< VLAN filtering disabled */ //vlan过滤
.jumbo_frame = 0, /**< Jumbo Frame Support disabled */ //巨星帧的支持
.hw_strip_crc = 0, /**< CRC stripped by hardware */ //使用硬件清除CRC
},
.txmode = {
.mq_mode = ETH_MQ_TX_NONE,
},
};
struct rte_mempool * l2fwd_pktmbuf_pool = NULL;
/* Per-port statistics struct */
struct l2fwd_port_statistics {
uint64_t tx;
uint64_t rx;
uint64_t dropped;
} __rte_cache_aligned;
struct l2fwd_port_statistics port_statistics[RTE_MAX_ETHPORTS];
#define MAX_TIMER_PERIOD 86400 /* 1 day max */
/* A tsc-based timer responsible for triggering statistics printout */
static uint64_t timer_period = 10; /* default period is 10 seconds */
/* Print out statistics on packets dropped */
//打印的属性跳过。。
static void
print_stats(void)
{
uint64_t total_packets_dropped, total_packets_tx, total_packets_rx;
unsigned portid;
total_packets_dropped = 0;
total_packets_tx = 0;
total_packets_rx = 0;
const char clr[] = { 27, '[', '2', 'J', '\0' };
const char topLeft[] = { 27, '[', '1', ';', '1', 'H','\0' };
/* Clear screen and move to top left */
printf("%s%s", clr, topLeft);
printf("\nPort statistics ====================================");
for (portid = 0; portid < RTE_MAX_ETHPORTS; portid++) {
/* skip disabled ports */
if ((l2fwd_enabled_port_mask & (1 << portid)) == 0)
continue;
printf("\nStatistics for port %u ------------------------------"
"\nPackets sent: %24"PRIu64
"\nPackets received: %20"PRIu64
"\nPackets dropped: %21"PRIu64,
portid,
port_statistics[portid].tx,
port_statistics[portid].rx,
port_statistics[portid].dropped);
total_packets_dropped += port_statistics[portid].dropped;
total_packets_tx += port_statistics[portid].tx;
total_packets_rx += port_statistics[portid].rx;
}
printf("\nAggregate statistics ==============================="
"\nTotal packets sent: %18"PRIu64
"\nTotal packets received: %14"PRIu64
"\nTotal packets dropped: %15"PRIu64,
total_packets_tx,
total_packets_rx,
total_packets_dropped);
printf("\n====================================================\n");
}
static void
l2fwd_mac_updating(struct rte_mbuf *m, unsigned dest_portid)
{
struct ether_hdr *eth;
void *tmp;
eth = rte_pktmbuf_mtod(m, struct ether_hdr *);
/* 02:00:00:00:00:xx */
tmp = ð->d_addr.addr_bytes[0];
*((uint64_t *)tmp) = 0x000000000002 + ((uint64_t)dest_portid << 40);
/* src addr */
ether_addr_copy(&l2fwd_ports_eth_addr[dest_portid], ð->s_addr);
}
//处理收到的数据包
static void
l2fwd_simple_forward(struct rte_mbuf *m, unsigned portid)
{
unsigned dst_port;
int sent;
struct rte_eth_dev_tx_buffer *buffer;
//获取目的端口ID
dst_port = l2fwd_dst_ports[portid];
//更新MAC地址
if (mac_updating)
l2fwd_mac_updating(m, dst_port);
//获取目的端口的 tx 缓存
buffer = tx_buffer[dst_port];
//发送数据包，到目的端口的tx缓存
sent = rte_eth_tx_buffer(dst_port, 0, buffer, m);
if (sent)
port_statistics[dst_port].tx += sent; //如果发包成功，发包计数+1
}
/* main processing loop */
static void
l2fwd_main_loop(void)
{
struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
struct rte_mbuf *m;
int sent;
unsigned lcore_id;
uint64_t prev_tsc, diff_tsc, cur_tsc, timer_tsc;
unsigned i, j, portid, nb_rx;
struct lcore_queue_conf *qconf;
const uint64_t drain_tsc = (rte_get_tsc_hz() + US_PER_S - 1) / US_PER_S *
BURST_TX_DRAIN_US;
struct rte_eth_dev_tx_buffer *buffer;
prev_tsc = 0;
timer_tsc = 0;
//获取当前核心的ID
lcore_id = rte_lcore_id();
//获取当前核心的配置
qconf = &lcore_queue_conf[lcore_id];
//如果 rx_port的个数为0，则 记录日志。（其实是出错了）
if (qconf->n_rx_port == 0) {
RTE_LOG(INFO, L2FWD, "lcore %u has nothing to do\n", lcore_id);
return;
}
//记录日志，
RTE_LOG(INFO, L2FWD, "entering main loop on lcore %u\n", lcore_id);
//遍历所有的port
for (i = 0; i < qconf->n_rx_port; i++) {
//获取到portID
portid = qconf->rx_port_list[i];
//记录日志
RTE_LOG(INFO, L2FWD, " -- lcoreid=%u portid=%u\n", lcore_id,
portid);
}
//如果没超时（最开始设置的那个二层转发的运行时间）
while (!force_quit) {
//获取时间戳
cur_tsc = rte_rdtsc();
/*
* TX burst queue drain
*/
//对比时间戳
diff_tsc = cur_tsc - prev_tsc;
if (unlikely(diff_tsc > drain_tsc)) {
for (i = 0; i < qconf->n_rx_port; i++) {
//获得portid和buffer
portid = l2fwd_dst_ports[qconf->rx_port_list[i]];
buffer = tx_buffer[portid];
//把buffer中的数据发送到portid对应的port
sent = rte_eth_tx_buffer_flush(portid, 0, buffer);
if (sent)
port_statistics[portid].tx += sent; //如果发包成功，发包计数+1
}
/* if timer is enabled */
//如果计时器开启
if (timer_period > 0) {
/* advance the timer */
//调整计时器
timer_tsc += diff_tsc;
/* if timer has reached its timeout */
//如果计时器超时
if (unlikely(timer_tsc >= timer_period)) {
/* do this only on master core */
//主线程打印一些属性，仅有主线程会执行print_stats
if (lcore_id == rte_get_master_lcore()) {
print_stats(); //打印属性，
/* reset the timer */
timer_tsc = 0; //设置计时器为0
}
}
}
prev_tsc = cur_tsc;
}
/*
* Read packet from RX queues //收包模块
*/
for (i = 0; i < qconf->n_rx_port; i++) {
//获取portID
portid = qconf->rx_port_list[i];
//从portID对应的Port收到nb_rx个包
nb_rx = rte_eth_rx_burst((uint8_t) portid, 0,
pkts_burst, MAX_PKT_BURST);
port_statistics[portid].rx += nb_rx; //收包计数+=nb_rx
for (j = 0; j < nb_rx; j++) { //遍历收到的包
m = pkts_burst[j];
rte_prefetch0(rte_pktmbuf_mtod(m, void *)); //预取到pktmbuf
l2fwd_simple_forward(m, portid); //调用函数，处理收到的包
}
}
}
}
//__attribute__((unused))表示可能没有这个参数，编译器不会报错
static int
l2fwd_launch_one_lcore(__attribute__((unused)) void *dummy)
{
l2fwd_main_loop(); //二层转发主要循环
return 0;
}
/* display usage */
static void
l2fwd_usage(const char *prgname)
{
printf("%s [EAL options] -- -p PORTMASK [-q NQ]\n"
" -p PORTMASK: hexadecimal bitmask of ports to configure\n"
" -q NQ: number of queue (=ports) per lcore (default is 1)\n"
" -T PERIOD: statistics will be refreshed each PERIOD seconds (0 to disable, 10 default, 86400 maximum)\n"
" --[no-]mac-updating: Enable or disable MAC addresses updating (enabled by default)\n"
" When enabled:\n"
" - The source MAC address is replaced by the TX port MAC address\n"
" - The destination MAC address is replaced by 02:00:00:00:00:TX_PORT_ID\n",
prgname);
}
static int
l2fwd_parse_portmask(const char *portmask)
{
char *end = NULL;
unsigned long pm;
/* parse hexadecimal string */
//解析十六进制字符串，将十六进制字符串转换为unsigned long
pm = strtoul(portmask, &end, 16);
if ((portmask[0] == '\0') || (end == NULL) || (*end != '\0'))
return -1;
if (pm == 0)
return -1;
return pm;
}
static unsigned int
l2fwd_parse_nqueue(const char *q_arg)
{
char *end = NULL;
unsigned long n;
/* parse hexadecimal string */
n = strtoul(q_arg, &end, 10);
if ((q_arg[0] == '\0') || (end == NULL) || (*end != '\0'))
return 0;
if (n == 0)
return 0;
if (n >= MAX_RX_QUEUE_PER_LCORE)
return 0;
return n;
}
static int
l2fwd_parse_timer_period(const char *q_arg)
{
char *end = NULL;
int n;
/* parse number string */
n = strtol(q_arg, &end, 10);
if ((q_arg[0] == '\0') || (end == NULL) || (*end != '\0'))
return -1;
if (n >= MAX_TIMER_PERIOD)
return -1;
return n;
}
//解析命令行参数
/* Parse the argument given in the command line of the application */
static int
l2fwd_parse_args(int argc, char **argv)
{
int opt, ret, timer_secs;
char **argvopt;
int option_index;
char *prgname = argv[0];
static struct option lgopts[] = {
{ "mac-updating", no_argument, &mac_updating, 1},
{ "no-mac-updating", no_argument, &mac_updating, 0},
{NULL, 0, 0, 0}
};
argvopt = argv; //复制argv指针
//解析命令行，getopt_long()可以解析命令行参数
while ((opt = getopt_long(argc, argvopt, "p:q:T:",
lgopts, &option_index)) != EOF) {
//命令行有三个参数， p:portmask，n:nqueue，T：timer period
switch (opt) {
/* portmask */
//port的个数，以十六进制表示的，如0x0f表示15
case 'p':
//l2fwd_parse_portmask()函数为自定义函数
//把十六进制的mask字符串转换成unsigned long。
//端口使能情况
l2fwd_enabled_port_mask = l2fwd_parse_portmask(optarg);
if (l2fwd_enabled_port_mask == 0) { //mask为0表示出错
printf("invalid portmask\n");
l2fwd_usage(prgname); //打印用户选项，类似于 --help
return -1; //参数传递错误，会返回-1，其结果是退出程序
}
break;
/* nqueue */
//队列的个数，同样也是用十六进制字符串表示的。
case 'q':
//每个核心配置几个 rx 队列。
l2fwd_rx_queue_per_lcore = l2fwd_parse_nqueue(optarg);
if (l2fwd_rx_queue_per_lcore == 0) { //lcore 0表示出错
printf("invalid queue number\n");
l2fwd_usage(prgname);
return -1; //返回-1，其结果是退出程序。
}
break;
/* timer period */ //定时器周期
case 'T':
//配置定时器周期，单位为秒
//即l2fwd运行多少秒，使用十六进制表示的。
timer_secs = l2fwd_parse_timer_period(optarg);
if (timer_secs < 0) {
printf("invalid timer period\n");
l2fwd_usage(prgname);
return -1;
}
//timer_period表示二层转发测试时间，默认为10秒，可通过-T来调节时间
timer_period = timer_secs;
break;
/* long options */
//--打头的选项不处理
case 0:
break;
default:
//参数传递错误，打印--help
l2fwd_usage(prgname);
return -1;
}
}
if (optind >= 0)
argv[optind-1] = prgname;
ret = optind-1;
optind = 0; /* reset getopt lib */
return ret;
}
/* Check the link status of all ports in up to 9s, and print them finally */
static void
check_all_ports_link_status(uint8_t port_num, uint32_t port_mask)
{
#define CHECK_INTERVAL 100 /* 100ms */
#define MAX_CHECK_TIME 90 /* 9s (90 * 100ms) in total */
uint8_t portid, count, all_ports_up, print_flag = 0;
struct rte_eth_link link;
printf("\nChecking link status");
fflush(stdout);
for (count = 0; count <= MAX_CHECK_TIME; count++) {
if (force_quit)
return;
all_ports_up = 1;
for (portid = 0; portid < port_num; portid++) {
if (force_quit)
return;
if ((port_mask & (1 << portid)) == 0)
continue;
memset(&link, 0, sizeof(link));
rte_eth_link_get_nowait(portid, &link);
/* print link status if flag set */
if (print_flag == 1) {
if (link.link_status)
printf("Port %d Link Up - speed %u "
"Mbps - %s\n", (uint8_t)portid,
(unsigned)link.link_speed,
(link.link_duplex == ETH_LINK_FULL_DUPLEX) ?
("full-duplex") : ("half-duplex\n"));
else
printf("Port %d Link Down\n",
(uint8_t)portid);
continue;
}
/* clear all_ports_up flag if any link down */
if (link.link_status == ETH_LINK_DOWN) {
all_ports_up = 0;
break;
}
}
/* after finally printing all link status, get out */
if (print_flag == 1)
break;
if (all_ports_up == 0) {
printf(".");
fflush(stdout);
rte_delay_ms(CHECK_INTERVAL);
}
/* set the print_flag if all ports up or timeout */
if (all_ports_up == 1 || count == (MAX_CHECK_TIME - 1)) {
print_flag = 1;
printf("done\n");
}
}
}
static void
signal_handler(int signum)
{
if (signum == SIGINT || signum == SIGTERM) {
printf("\n\nSignal %d received, preparing to exit...\n",
signum);
force_quit = true; //强制退出按钮为真
}
}
int
main(int argc, char **argv)
{
/*
//程序前面自定义的结构
// __rte_cache_aligned 是一个宏，表示内存对其
struct lcore_queue_conf {
unsigned n_rx_port; //rx_port个数
unsigned rx_port_list[MAX_RX_QUEUE_PER_LCORE]; //rx_port列表
} __rte_cache_aligned;
struct lcore_queue_conf lcore_queue_conf[RTE_MAX_LCORE];
//一个计算机，包含多个核心，一个核心处理多个rx_port
*/
struct lcore_queue_conf *qconf;
struct rte_eth_dev_info dev_info; //设备信息
int ret; //返回值
uint8_t nb_ports; //总port个数
uint8_t nb_ports_available; //可用port个数
uint8_t portid, last_port; //当前portid，前一个portid。
unsigned lcore_id, rx_lcore_id; //核心id，rx_lcore_id
unsigned nb_ports_in_mask = 0; //？？
/* init EAL */
//初始化环境
ret = rte_eal_init(argc, argv);
if (ret < 0)
rte_exit(EXIT_FAILURE, "Invalid EAL arguments\n");
argc -= ret; //？？未知，貌似没用，不明所以
argv += ret; //？？未知，貌似没用，不明所以
force_quit = false; //强制推出按钮为假
//当捕获到SIGINT或SIGTERM信号时，强制推出按钮为真，详见signal_handler
//signal_handler为自定义函数
signal(SIGINT, signal_handler); //信号捕获处理1
signal(SIGTERM, signal_handler); //信号捕获处理2
/* parse application arguments (after the EAL ones) */
//解析传参（必须在eal_init之后），此为自定义函数，详见函数定义
ret = l2fwd_parse_args(argc, argv);
if (ret < 0)
rte_exit(EXIT_FAILURE, "Invalid L2FWD arguments\n");
printf("MAC updating %s\n", mac_updating ? "enabled" : "disabled");
/* convert to number of cycles */
//获取定时器的时钟周期
timer_period *= rte_get_timer_hz();
/* create the mbuf pool */
//创建缓存池，用于存储数据包。
l2fwd_pktmbuf_pool = rte_pktmbuf_pool_create("mbuf_pool", NB_MBUF,
MEMPOOL_CACHE_SIZE, 0, RTE_MBUF_DEFAULT_BUF_SIZE,
rte_socket_id());
if (l2fwd_pktmbuf_pool == NULL)
rte_exit(EXIT_FAILURE, "Cannot init mbuf pool\n");
//获取Eth口的个数
nb_ports = rte_eth_dev_count();
if (nb_ports == 0)
rte_exit(EXIT_FAILURE, "No Ethernet ports - bye\n");
/* reset l2fwd_dst_ports */
//复位（清0）目的端口，此代码块作用是初始化l2fwd_dst_ports
//个人认为写的比较low
for (portid = 0; portid < RTE_MAX_ETHPORTS; portid++)
l2fwd_dst_ports[portid] = 0;
last_port = 0;
/*
* Each logical core is assigned a dedicated TX queue on each port.
*/
//设置每个 port 接收的数据包要 转发 到的目的port。
for (portid = 0; portid < nb_ports; portid++) {
/* skip ports that are not enabled */
//跳过没使能的端口
if ((l2fwd_enabled_port_mask & (1 << portid)) == 0)
continue;
//每两个port为一对，互相作二层转发
//单数发到单数+1，双数发到双数-1
if (nb_ports_in_mask % 2) {
l2fwd_dst_ports[portid] = last_port;
l2fwd_dst_ports[last_port] = portid;
}
else
last_port = portid; //对last_port赋值。
nb_ports_in_mask++; //对标记 ++
rte_eth_dev_info_get(portid, &dev_info); //获取对应portid的dev信息
}
//如果剩下一个网口，则该网口自己转发给自己
if (nb_ports_in_mask % 2) {
printf("Notice: odd number of ports in portmask.\n");
l2fwd_dst_ports[last_port] = last_port;
}
rx_lcore_id = 0;
qconf = NULL;
//初始化每个核心的队列配置
/* Initialize the port/queue configuration of each logical core */
//遍历所有port
for (portid = 0; portid < nb_ports; portid++) {
/* skip ports that are not enabled */
//跳过没使能的端口
if ((l2fwd_enabled_port_mask & (1 << portid)) == 0)
continue;
/* get the lcore_id for this port */
//port分配一个 lcore_id。
//rte_lcore_is_enabled(rx_lcore_id) 测试core是否使能
//lcore_queue_conf是一个自定义的结构，包含port个数和portid
//意思是一个核心，对多个port的rx队列
//在这里，一个核心只能匹配一个port
while (rte_lcore_is_enabled(rx_lcore_id) == 0 ||
lcore_queue_conf[rx_lcore_id].n_rx_port ==
l2fwd_rx_queue_per_lcore) {
rx_lcore_id++;
if (rx_lcore_id >= RTE_MAX_LCORE)
rte_exit(EXIT_FAILURE, "Not enough cores\n");
}
//赋值qconf，qconf最开始为NULL
if (qconf != &lcore_queue_conf[rx_lcore_id])
/* Assigned a new logical core in the loop above. */
qconf = &lcore_queue_conf[rx_lcore_id];
//当前lcore添加一个port
//当前lcore管理的rx_port总数+1
qconf->rx_port_list[qconf->n_rx_port] = portid;
qconf->n_rx_port++;
printf("Lcore %u: RX port %u\n", rx_lcore_id, (unsigned) portid);
}
//使能的port总数
nb_ports_available = nb_ports;
/* Initialise each port */
//获取可用的port个数
for (portid = 0; portid < nb_ports; portid++) {
/* skip ports that are not enabled */
//不可用的会剪掉。
if ((l2fwd_enabled_port_mask & (1 << portid)) == 0) {
printf("Skipping disabled port %u\n", (unsigned) portid);
nb_ports_available--;
continue;
}
/* init port */
//初始化port
printf("Initializing port %u... ", (unsigned) portid);
fflush(stdout);
//配置port，其中port_conf是一个结构，包含关于port的配置
//vlan分离，crc硬件校验，认为这两个有用。
ret = rte_eth_dev_configure(portid, 1, 1, &port_conf);
if (ret < 0)
rte_exit(EXIT_FAILURE, "Cannot configure device: err=%d, port=%u\n",
ret, (unsigned) portid);
//获取port的mac地址
//l2fwd_ports_eth_addr[] 的 类型为一个结构，是全局数组
rte_eth_macaddr_get(portid,&l2fwd_ports_eth_addr[portid]);
/* init one RX queue */
//初始化RX队列
fflush(stdout);
//rx队列会绑定到当前port上，l2fwd_pktmbuf_pool为内存池
ret = rte_eth_rx_queue_setup(portid, 0, nb_rxd,
rte_eth_dev_socket_id(portid),
NULL,
l2fwd_pktmbuf_pool);
if (ret < 0)
rte_exit(EXIT_FAILURE, "rte_eth_rx_queue_setup:err=%d, port=%u\n",
ret, (unsigned) portid);
/* init one TX queue on each port */
//初始化tx队列
fflush(stdout);
//tx队列会绑定到port上
ret = rte_eth_tx_queue_setup(portid, 0, nb_txd,
rte_eth_dev_socket_id(portid),
NULL);
if (ret < 0)
rte_exit(EXIT_FAILURE, "rte_eth_tx_queue_setup:err=%d, port=%u\n",
ret, (unsigned) portid);
/* Initialize TX buffers */
//malloc tx缓存，tx_buffer为指针数组，每个port对应一个tx缓存
tx_buffer[portid] = rte_zmalloc_socket("tx_buffer",
RTE_ETH_TX_BUFFER_SIZE(MAX_PKT_BURST), 0,
rte_eth_dev_socket_id(portid));
if (tx_buffer[portid] == NULL)
rte_exit(EXIT_FAILURE, "Cannot allocate buffer for tx on port %u\n",
(unsigned) portid);
//初始化tx缓存
rte_eth_tx_buffer_init(tx_buffer[portid], MAX_PKT_BURST);
//tx缓存满了的时候，设置回调函数
ret = rte_eth_tx_buffer_set_err_callback(tx_buffer[portid],
rte_eth_tx_buffer_count_callback,
&port_statistics[portid].dropped);
if (ret < 0)
rte_exit(EXIT_FAILURE, "Cannot set error callback for "
"tx buffer on port %u\n", (unsigned) portid);
/* Start device */
//启动设备
ret = rte_eth_dev_start(portid);
if (ret < 0)
rte_exit(EXIT_FAILURE, "rte_eth_dev_start:err=%d, port=%u\n",
ret, (unsigned) portid);
printf("done: \n");
//设置网卡为混杂模式
rte_eth_promiscuous_enable(portid);
//打印port的MAC地址
printf("Port %u, MAC address: %02X:%02X:%02X:%02X:%02X:%02X\n\n",
(unsigned) portid,
l2fwd_ports_eth_addr[portid].addr_bytes[0],
l2fwd_ports_eth_addr[portid].addr_bytes[1],
l2fwd_ports_eth_addr[portid].addr_bytes[2],
l2fwd_ports_eth_addr[portid].addr_bytes[3],
l2fwd_ports_eth_addr[portid].addr_bytes[4],
l2fwd_ports_eth_addr[portid].addr_bytes[5]);
/* initialize port stats */
//初始化port属性
memset(&port_statistics, 0, sizeof(port_statistics));
}
//如果可以使能的网卡为0个，则报错。
if (!nb_ports_available) {
rte_exit(EXIT_FAILURE,
"All available ports are disabled. Please set portmask.\n");
}
//检查所有port的link属性
check_all_ports_link_status(nb_ports, l2fwd_enabled_port_mask);
ret = 0;
/* launch per-lcore init on every lcore */
//启动所有的lcore，回调l2fwd_launch_one_lcore函数，参数为NULL
rte_eal_mp_remote_launch(l2fwd_launch_one_lcore, NULL, CALL_MASTER);
//遍历所有lcore_id
RTE_LCORE_FOREACH_SLAVE(lcore_id) {
//等所有线程结束
if (rte_eal_wait_lcore(lcore_id) < 0) {
ret = -1;
break;
}
}
//停止并且关闭所有的port
for (portid = 0; portid < nb_ports; portid++) {
if ((l2fwd_enabled_port_mask & (1 << portid)) == 0)
continue;
printf("Closing port %d...", portid);
rte_eth_dev_stop(portid);
rte_eth_dev_close(portid);
printf(" Done\n");
}
printf("Bye...\n");
return ret;
}
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