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v26.07
examples/skeleton/basicfwd.c
221 строка
6 KB
Arin Kharkar
examples/skeleton: report available port count on error
17 июл 2026, 16:30
17 июл 2026, 16:30
683987d
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/* SPDX-License-Identifier: BSD-3-Clause * Copyright(c) 2010-2015 Intel Corporation */ #include <stdint.h> #include <stdlib.h> #include <inttypes.h> #include <rte_eal.h> #include <rte_ethdev.h> #include <rte_cycles.h> #include <rte_lcore.h> #include <rte_mbuf.h> #define RX_RING_SIZE 1024 #define TX_RING_SIZE 1024 #define NUM_MBUFS 8191 #define MBUF_CACHE_SIZE 250 #define BURST_SIZE 32 /* basicfwd.c: Basic DPDK skeleton forwarding example. */ /* * Initializes a given port using global settings and with the RX buffers * coming from the mbuf_pool passed as a parameter. */ /* Main functional part of port initialization. 8< */ static inline int port_init(uint16_t port, struct rte_mempool *mbuf_pool) { struct rte_eth_conf port_conf; const uint16_t rx_rings = 1, tx_rings = 1; uint16_t nb_rxd = RX_RING_SIZE; uint16_t nb_txd = TX_RING_SIZE; int retval; uint16_t q; struct rte_eth_dev_info dev_info; struct rte_eth_txconf txconf; if (!rte_eth_dev_is_valid_port(port)) return -1; memset(&port_conf, 0, sizeof(struct rte_eth_conf)); retval = rte_eth_dev_info_get(port, &dev_info); if (retval != 0) { printf("Error during getting device (port %u) info: %s\n", port, strerror(-retval)); return retval; } if (dev_info.tx_offload_capa & RTE_ETH_TX_OFFLOAD_MBUF_FAST_FREE) port_conf.txmode.offloads |= RTE_ETH_TX_OFFLOAD_MBUF_FAST_FREE; /* Configure the Ethernet device. */ retval = rte_eth_dev_configure(port, rx_rings, tx_rings, &port_conf); if (retval != 0) return retval; retval = rte_eth_dev_adjust_nb_rx_tx_desc(port, &nb_rxd, &nb_txd); if (retval != 0) return retval; /* Allocate and set up 1 RX queue per Ethernet port. */ for (q = 0; q < rx_rings; q++) { retval = rte_eth_rx_queue_setup(port, q, nb_rxd, rte_eth_dev_socket_id(port), NULL, mbuf_pool); if (retval < 0) return retval; } txconf = dev_info.default_txconf; txconf.offloads = port_conf.txmode.offloads; /* Allocate and set up 1 TX queue per Ethernet port. */ for (q = 0; q < tx_rings; q++) { retval = rte_eth_tx_queue_setup(port, q, nb_txd, rte_eth_dev_socket_id(port), &txconf); if (retval < 0) return retval; } /* Starting Ethernet port. 8< */ retval = rte_eth_dev_start(port); /* >8 End of starting of ethernet port. */ if (retval < 0) return retval; /* Display the port MAC address. */ struct rte_ether_addr addr; retval = rte_eth_macaddr_get(port, &addr); if (retval != 0) return retval; printf("Port %u MAC: %02" PRIx8 " %02" PRIx8 " %02" PRIx8 " %02" PRIx8 " %02" PRIx8 " %02" PRIx8 "\n", port, RTE_ETHER_ADDR_BYTES(&addr)); /* Enable RX in promiscuous mode for the Ethernet device. */ retval = rte_eth_promiscuous_enable(port); /* End of setting RX port in promiscuous mode. */ if (retval != 0) return retval; return 0; } /* >8 End of main functional part of port initialization. */ /* * The lcore main. This is the main thread that does the work, reading from * an input port and writing to an output port. */ /* Basic forwarding application lcore. 8< */ static __rte_noreturn void lcore_main(void) { uint16_t port; /* * Check that the port is on the same NUMA node as the polling thread * for best performance. */ RTE_ETH_FOREACH_DEV(port) if (rte_eth_dev_socket_id(port) >= 0 && rte_eth_dev_socket_id(port) != (int)rte_socket_id()) printf("WARNING, port %u is on remote NUMA node to " "polling thread.\n\tPerformance will " "not be optimal.\n", port); printf("\nCore %u forwarding packets. [Ctrl+C to quit]\n", rte_lcore_id()); /* Main work of application loop. 8< */ for (;;) { /* * Receive packets on a port and forward them on the paired * port. The mapping is 0 -> 1, 1 -> 0, 2 -> 3, 3 -> 2, etc. */ RTE_ETH_FOREACH_DEV(port) { /* Get burst of RX packets, from first port of pair. */ struct rte_mbuf *bufs[BURST_SIZE]; const uint16_t nb_rx = rte_eth_rx_burst(port, 0, bufs, BURST_SIZE); if (unlikely(nb_rx == 0)) continue; /* Send burst of TX packets, to second port of pair. */ const uint16_t nb_tx = rte_eth_tx_burst(port ^ 1, 0, bufs, nb_rx); /* Free any unsent packets. */ if (unlikely(nb_tx < nb_rx)) { uint16_t buf; for (buf = nb_tx; buf < nb_rx; buf++) rte_pktmbuf_free(bufs[buf]); } } } /* >8 End of loop. */ } /* >8 End Basic forwarding application lcore. */ /* * The main function, which does initialization and calls the per-lcore * functions. */ int main(int argc, char *argv[]) { struct rte_mempool *mbuf_pool; unsigned nb_ports; uint16_t portid; /* Initializion the Environment Abstraction Layer (EAL). 8< */ int ret = rte_eal_init(argc, argv); if (ret < 0) rte_exit(EXIT_FAILURE, "Error with EAL initialization\n"); /* >8 End of initialization the Environment Abstraction Layer (EAL). */ argc -= ret; argv += ret; /* Check that there is an even number of ports to send/receive on. */ nb_ports = rte_eth_dev_count_avail(); if (nb_ports < 2 || (nb_ports & 1)) rte_exit(EXIT_FAILURE, "Error: number of ports must be even, found %u ports\n", nb_ports); /* Create and allocate a mempool to hold the mbufs. 8< */ mbuf_pool = rte_pktmbuf_pool_create("MBUF_POOL", NUM_MBUFS * nb_ports, MBUF_CACHE_SIZE, 0, RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id()); /* >8 End of allocating mempool to hold mbuf. */ if (mbuf_pool == NULL) rte_exit(EXIT_FAILURE, "Cannot create mbuf pool\n"); /* Initializing all ports. 8< */ RTE_ETH_FOREACH_DEV(portid) if (port_init(portid, mbuf_pool) != 0) rte_exit(EXIT_FAILURE, "Cannot init port %"PRIu16 "\n", portid); /* >8 End of initializing all ports. */ if (rte_lcore_count() > 1) printf("\nWARNING: Too many lcores enabled. Only 1 used.\n"); /* Call lcore_main on the main core only. Called on single lcore. 8< */ lcore_main(); /* >8 End of called on single lcore. */ /* clean up the EAL */ rte_eal_cleanup(); return 0; }