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37 #include <rte_ethdev.h>
38 #include <rte_cycles.h>
39 #include <rte_lcore.h>
42 #define RX_RING_SIZE 128
43 #define TX_RING_SIZE 512
45 #define NUM_MBUFS 8191
46 #define MBUF_CACHE_SIZE 250
49 static const struct rte_eth_conf port_conf_default = {
50 .rxmode = { .max_rx_pkt_len = ETHER_MAX_LEN }
53 /* basicfwd.c: Basic DPDK skeleton forwarding example. */
56 * Initializes a given port using global settings and with the RX buffers
57 * coming from the mbuf_pool passed as a parameter.
60 port_init(uint16_t port, struct rte_mempool *mbuf_pool)
62 struct rte_eth_conf port_conf = port_conf_default;
63 const uint16_t rx_rings = 1, tx_rings = 1;
64 uint16_t nb_rxd = RX_RING_SIZE;
65 uint16_t nb_txd = TX_RING_SIZE;
69 if (port >= rte_eth_dev_count())
72 /* Configure the Ethernet device. */
73 retval = rte_eth_dev_configure(port, rx_rings, tx_rings, &port_conf);
77 retval = rte_eth_dev_adjust_nb_rx_tx_desc(port, &nb_rxd, &nb_txd);
81 /* Allocate and set up 1 RX queue per Ethernet port. */
82 for (q = 0; q < rx_rings; q++) {
83 retval = rte_eth_rx_queue_setup(port, q, nb_rxd,
84 rte_eth_dev_socket_id(port), NULL, mbuf_pool);
89 /* Allocate and set up 1 TX queue per Ethernet port. */
90 for (q = 0; q < tx_rings; q++) {
91 retval = rte_eth_tx_queue_setup(port, q, nb_txd,
92 rte_eth_dev_socket_id(port), NULL);
97 /* Start the Ethernet port. */
98 retval = rte_eth_dev_start(port);
102 /* Display the port MAC address. */
103 struct ether_addr addr;
104 rte_eth_macaddr_get(port, &addr);
105 printf("Port %u MAC: %02" PRIx8 " %02" PRIx8 " %02" PRIx8
106 " %02" PRIx8 " %02" PRIx8 " %02" PRIx8 "\n",
108 addr.addr_bytes[0], addr.addr_bytes[1],
109 addr.addr_bytes[2], addr.addr_bytes[3],
110 addr.addr_bytes[4], addr.addr_bytes[5]);
112 /* Enable RX in promiscuous mode for the Ethernet device. */
113 rte_eth_promiscuous_enable(port);
119 * The lcore main. This is the main thread that does the work, reading from
120 * an input port and writing to an output port.
122 static __attribute__((noreturn)) void
125 const uint16_t nb_ports = rte_eth_dev_count();
129 * Check that the port is on the same NUMA node as the polling thread
130 * for best performance.
132 for (port = 0; port < nb_ports; port++)
133 if (rte_eth_dev_socket_id(port) > 0 &&
134 rte_eth_dev_socket_id(port) !=
135 (int)rte_socket_id())
136 printf("WARNING, port %u is on remote NUMA node to "
137 "polling thread.\n\tPerformance will "
138 "not be optimal.\n", port);
140 printf("\nCore %u forwarding packets. [Ctrl+C to quit]\n",
143 /* Run until the application is quit or killed. */
146 * Receive packets on a port and forward them on the paired
147 * port. The mapping is 0 -> 1, 1 -> 0, 2 -> 3, 3 -> 2, etc.
149 for (port = 0; port < nb_ports; port++) {
151 /* Get burst of RX packets, from first port of pair. */
152 struct rte_mbuf *bufs[BURST_SIZE];
153 const uint16_t nb_rx = rte_eth_rx_burst(port, 0,
156 if (unlikely(nb_rx == 0))
159 /* Send burst of TX packets, to second port of pair. */
160 const uint16_t nb_tx = rte_eth_tx_burst(port ^ 1, 0,
163 /* Free any unsent packets. */
164 if (unlikely(nb_tx < nb_rx)) {
166 for (buf = nb_tx; buf < nb_rx; buf++)
167 rte_pktmbuf_free(bufs[buf]);
174 * The main function, which does initialization and calls the per-lcore
178 main(int argc, char *argv[])
180 struct rte_mempool *mbuf_pool;
184 /* Initialize the Environment Abstraction Layer (EAL). */
185 int ret = rte_eal_init(argc, argv);
187 rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
192 /* Check that there is an even number of ports to send/receive on. */
193 nb_ports = rte_eth_dev_count();
194 if (nb_ports < 2 || (nb_ports & 1))
195 rte_exit(EXIT_FAILURE, "Error: number of ports must be even\n");
197 /* Creates a new mempool in memory to hold the mbufs. */
198 mbuf_pool = rte_pktmbuf_pool_create("MBUF_POOL", NUM_MBUFS * nb_ports,
199 MBUF_CACHE_SIZE, 0, RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id());
201 if (mbuf_pool == NULL)
202 rte_exit(EXIT_FAILURE, "Cannot create mbuf pool\n");
204 /* Initialize all ports. */
205 for (portid = 0; portid < nb_ports; portid++)
206 if (port_init(portid, mbuf_pool) != 0)
207 rte_exit(EXIT_FAILURE, "Cannot init port %"PRIu16 "\n",
210 if (rte_lcore_count() > 1)
211 printf("\nWARNING: Too many lcores enabled. Only 1 used.\n");
213 /* Call lcore_main on the master core only. */