./build/l2fwd -l 0-3 -n 4 -- -q 8 -p 0x2 -T 1
./build/l2fwd -l 0-3 -n 4 -d librte_pmd_e1000.so -d librte_mempool_ring.so -- -q 8 -p 0x2 -T 1
gdb --args ./build/l2fwd -l 0-3 -n 4 -d librte_pmd_e1000.so -d librte_mempool_ring.so -- -q 8 -p 0x3 -T 1
/* init EAL */
ret = rte_eal_init(argc, argv);
/* arguments of port, queue and time */
ret = l2fwd_parse_args(argc, argv);
l2fwd_enabled_port_mask = l2fwd_parse_portmask(optarg);
l2fwd_rx_queue_per_lcore = l2fwd_parse_nqueue(optarg);
timer_secs = l2fwd_parse_timer_period(optarg);
/* create the mbuf pool */
l2fwd_pktmbuf_pool = rte_pktmbuf_pool_create("mbuf_pool", // name
NB_MBUF, // number of elements
MEMPOOL_CACHE_SIZE, //cache size
0, //private data size
RTE_MBUF_DEFAULT_BUF_SIZE, //each of the rte-mbuf size
rte_socket_id()); // master: 0the basic initialization for packet forwarding
/* reset l2fwd_dst_ports */
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.
*/
for (portid = 0; portid < nb_ports; portid++) {
if ((l2fwd_enabled_port_mask & (1 << portid)) == 0)
continue;
if (nb_ports_in_mask % 2) {
l2fwd_dst_ports[portid] = last_port;
l2fwd_dst_ports[last_port] = portid;
} else
last_port = portid;
nb_ports_in_mask++;
rte_eth_dev_info_get(portid, &dev_info); // this function is not necessary
}match destination array for each of the ports
/*
* save the list of port id in the global configuration struct
*/
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];
struct lcore_queue_conf *qconf;
for (portid = 0; portid < nb_ports; portid++) {
// skip ports that are not enabled
if ((l2fwd_enabled_port_mask & (1 << portid)) == 0)
continue;
// get the lcore_id for this 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");
}
if (qconf != &lcore_queue_conf[rx_lcore_id])
// Assigned a new logical core in the loop above.
qconf = &lcore_queue_conf[rx_lcore_id];
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);
}
nb_ports_available = nb_ports;lcore_queue_conf
add the number of rx queues for the global configuration file
/* Initialise each port */
for (portid = 0; portid < nb_ports; portid++) {
// skip ports that are not enabled
if ((l2fwd_enabled_port_mask & (1 << portid)) == 0) {
printf("Skipping disabled port %u\n", (unsigned) portid);
nb_ports_available--;
continue;
}
// init port
printf("Initializing port %u... ", (unsigned) portid);
fflush(stdout);
ret = rte_eth_dev_configure(portid, 1, 1, &port_conf);
// ethernet addresses of ports
rte_eth_macaddr_get(portid,&l2fwd_ports_eth_addr[portid]);
// static struct ether_addr l2fwd_ports_eth_addr[RTE_MAX_ETHPORTS];
// l2fwd_ports_eth_addr[portid].addr_bytes[0],
// l2fwd_ports_eth_addr[portid].addr_bytes[1],
// l2fwd_ports_eth_addr[portid].addr_bytes[2],
// init one RX queue
fflush(stdout);
ret = rte_eth_rx_queue_setup(portid, // The port identifier of the Ethernet device.
0, // The index of the receive queue to set up.
nb_rxd, // The number of receive descriptors to allocate for the receive ring.
rte_eth_dev_socket_id(portid), // The socket_id argument is the socket identifier in case of NUMA.
NULL, // The pointer to the configuration data to be used for the receive queue
l2fwd_pktmbuf_pool); // The pointer to the memory pool
// init one TX queue on each port
fflush(stdout);
ret = rte_eth_tx_queue_setup(portid, 0, nb_txd, rte_eth_dev_socket_id(portid), NULL);
// static struct rte_eth_dev_tx_buffer * tx_buffer[RTE_MAX_ETHPORTS];
// Structure used to buffer packets for future TX Used by APIs rte_eth_tx_buffer and rte_eth_tx_buffer_flush
// Initialize TX buffers
tx_buffer[portid] = rte_zmalloc_socket(
"tx_buffer", // name
RTE_ETH_TX_BUFFER_SIZE(MAX_PKT_BURST), // Size (in bytes) to be allocated
0, // if 0, the return is a pointer that is suitably aligned for any kind of variable
rte_eth_dev_socket_id(portid) // NUMA socket to allocate memory on.
);
rte_eth_tx_buffer_init(
tx_buffer[portid], // Tx buffer to be initialized
MAX_PKT_BURST // Buffer size
);
// read the packet loss
ret = rte_eth_tx_buffer_set_err_callback(tx_buffer[portid], rte_eth_tx_buffer_count_callback, &port_statistics[portid].dropped);
// Start device
ret = rte_eth_dev_start(portid);
rte_eth_promiscuous_enable(portid);
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
memset(&port_statistics, 0, sizeof(port_statistics));
}
check_all_ports_link_status(nb_ports, l2fwd_enabled_port_mask);ret = 0;
/* launch per-lcore init on every lcore */
rte_eal_mp_remote_launch(l2fwd_launch_one_lcore, NULL, CALL_MASTER);
RTE_LCORE_FOREACH_SLAVE(lcore_id) {
if (rte_eal_wait_lcore(lcore_id) < 0) {
ret = -1;
break;
}
}prev_tsc = 0;
timer_tsc = 0;
lcore_id = rte_lcore_id(); // get the current core id
qconf = &lcore_queue_conf[lcore_id]; // get the configuration file of the core id
if (qconf->n_rx_port == 0) {
RTE_LOG(INFO, L2FWD, "lcore %u has nothing to do\n", lcore_id);
return;
}
while (!force_quit) {
cur_tsc = rte_rdtsc();
// TX burst queue drain
diff_tsc = cur_tsc - prev_tsc;
if (unlikely(diff_tsc > drain_tsc)) {
for (i = 0; i < qconf->n_rx_port; i++) {
portid = l2fwd_dst_ports[qconf->rx_port_list[i]];
buffer = tx_buffer[portid];
sent = rte_eth_tx_buffer_flush(portid, 0, buffer);
if (sent)
port_statistics[portid].tx += sent;
}
// if timer is enabled
if (timer_period > 0) {
// advance the timer
timer_tsc += diff_tsc;
// if timer has reached its timeout
if (unlikely(timer_tsc >= timer_period)) {
// do this only on master core
if (lcore_id == rte_get_master_lcore()) {
print_stats();
// reset the timer
timer_tsc = 0;
}
}
}
prev_tsc = cur_tsc;
}run when printing the status
it seems that it also drains the tx queue if necessary
// Read packet from RX queues
for (i = 0; i < qconf->n_rx_port; i++) {
portid = qconf->rx_port_list[i];
nb_rx = rte_eth_rx_burst((uint8_t) portid, 0,
pkts_burst, MAX_PKT_BURST);
port_statistics[portid].rx += nb_rx;
for (j = 0; j < nb_rx; j++) {
m = pkts_burst[j];
rte_prefetch0( // Prefetch a cache line into all cache levels.
rte_pktmbuf_mtod(
m, // The packet mbuf.
void * // The type to cast the result into
)
);
l2fwd_simple_forward(m, portid);
}
}
}static void
l2fwd_simple_forward(struct rte_mbuf *m, unsigned portid){
unsigned dst_port;
int sent;
struct rte_eth_dev_tx_buffer *buffer;
dst_port = l2fwd_dst_ports[portid];
if (mac_updating)
l2fwd_mac_updating(m, dst_port);
buffer = tx_buffer[dst_port];
sent = rte_eth_tx_buffer(dst_port, 0, buffer, m);
if (sent)
port_statistics[dst_port].tx += sent;
}