ceph/src/spdk/dpdk/examples/skeleton/basicfwd.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2015 Intel Corporation
   3  */
   4
   5 #include <stdint.h>
   6 #include <inttypes.h>
   7 #include <rte_eal.h>
   8 #include <rte_ethdev.h>
   9 #include <rte_cycles.h>
  10 #include <rte_lcore.h>
  11 #include <rte_mbuf.h>
  12
  13 #define RX_RING_SIZE 1024
  14 #define TX_RING_SIZE 1024
  15
  16 #define NUM_MBUFS 8191
  17 #define MBUF_CACHE_SIZE 250
  18 #define BURST_SIZE 32
  19
  20 static const struct rte_eth_conf port_conf_default = {
  21         .rxmode = {
  22                 .max_rx_pkt_len = ETHER_MAX_LEN,
  23         },
  24 };
  25
  26 /* basicfwd.c: Basic DPDK skeleton forwarding example. */
  27
  28 /*
  29  * Initializes a given port using global settings and with the RX buffers
  30  * coming from the mbuf_pool passed as a parameter.
  31  */
  32 static inline int
  33 port_init(uint16_t port, struct rte_mempool *mbuf_pool)
  34 {
  35         struct rte_eth_conf port_conf = port_conf_default;
  36         const uint16_t rx_rings = 1, tx_rings = 1;
  37         uint16_t nb_rxd = RX_RING_SIZE;
  38         uint16_t nb_txd = TX_RING_SIZE;
  39         int retval;
  40         uint16_t q;
  41         struct rte_eth_dev_info dev_info;
  42         struct rte_eth_txconf txconf;
  43
  44         if (!rte_eth_dev_is_valid_port(port))
  45                 return -1;
  46
  47         rte_eth_dev_info_get(port, &dev_info);
  48         if (dev_info.tx_offload_capa & DEV_TX_OFFLOAD_MBUF_FAST_FREE)
  49                 port_conf.txmode.offloads |=
  50                         DEV_TX_OFFLOAD_MBUF_FAST_FREE;
  51
  52         /* Configure the Ethernet device. */
  53         retval = rte_eth_dev_configure(port, rx_rings, tx_rings, &port_conf);
  54         if (retval != 0)
  55                 return retval;
  56
  57         retval = rte_eth_dev_adjust_nb_rx_tx_desc(port, &nb_rxd, &nb_txd);
  58         if (retval != 0)
  59                 return retval;
  60
  61         /* Allocate and set up 1 RX queue per Ethernet port. */
  62         for (q = 0; q < rx_rings; q++) {
  63                 retval = rte_eth_rx_queue_setup(port, q, nb_rxd,
  64                                 rte_eth_dev_socket_id(port), NULL, mbuf_pool);
  65                 if (retval < 0)
  66                         return retval;
  67         }
  68
  69         txconf = dev_info.default_txconf;
  70         txconf.offloads = port_conf.txmode.offloads;
  71         /* Allocate and set up 1 TX queue per Ethernet port. */
  72         for (q = 0; q < tx_rings; q++) {
  73                 retval = rte_eth_tx_queue_setup(port, q, nb_txd,
  74                                 rte_eth_dev_socket_id(port), &txconf);
  75                 if (retval < 0)
  76                         return retval;
  77         }
  78
  79         /* Start the Ethernet port. */
  80         retval = rte_eth_dev_start(port);
  81         if (retval < 0)
  82                 return retval;
  83
  84         /* Display the port MAC address. */
  85         struct ether_addr addr;
  86         rte_eth_macaddr_get(port, &addr);
  87         printf("Port %u MAC: %02" PRIx8 " %02" PRIx8 " %02" PRIx8
  88                            " %02" PRIx8 " %02" PRIx8 " %02" PRIx8 "\n",
  89                         port,
  90                         addr.addr_bytes[0], addr.addr_bytes[1],
  91                         addr.addr_bytes[2], addr.addr_bytes[3],
  92                         addr.addr_bytes[4], addr.addr_bytes[5]);
  93
  94         /* Enable RX in promiscuous mode for the Ethernet device. */
  95         rte_eth_promiscuous_enable(port);
  96
  97         return 0;
  98 }
  99
 100 /*
 101  * The lcore main. This is the main thread that does the work, reading from
 102  * an input port and writing to an output port.
 103  */
 104 static __attribute__((noreturn)) void
 105 lcore_main(void)
 106 {
 107         uint16_t port;
 108
 109         /*
 110          * Check that the port is on the same NUMA node as the polling thread
 111          * for best performance.
 112          */
 113         RTE_ETH_FOREACH_DEV(port)
 114                 if (rte_eth_dev_socket_id(port) > 0 &&
 115                                 rte_eth_dev_socket_id(port) !=
 116                                                 (int)rte_socket_id())
 117                         printf("WARNING, port %u is on remote NUMA node to "
 118                                         "polling thread.\n\tPerformance will "
 119                                         "not be optimal.\n", port);
 120
 121         printf("\nCore %u forwarding packets. [Ctrl+C to quit]\n",
 122                         rte_lcore_id());
 123
 124         /* Run until the application is quit or killed. */
 125         for (;;) {
 126                 /*
 127                  * Receive packets on a port and forward them on the paired
 128                  * port. The mapping is 0 -> 1, 1 -> 0, 2 -> 3, 3 -> 2, etc.
 129                  */
 130                 RTE_ETH_FOREACH_DEV(port) {
 131
 132                         /* Get burst of RX packets, from first port of pair. */
 133                         struct rte_mbuf *bufs[BURST_SIZE];
 134                         const uint16_t nb_rx = rte_eth_rx_burst(port, 0,
 135                                         bufs, BURST_SIZE);
 136
 137                         if (unlikely(nb_rx == 0))
 138                                 continue;
 139
 140                         /* Send burst of TX packets, to second port of pair. */
 141                         const uint16_t nb_tx = rte_eth_tx_burst(port ^ 1, 0,
 142                                         bufs, nb_rx);
 143
 144                         /* Free any unsent packets. */
 145                         if (unlikely(nb_tx < nb_rx)) {
 146                                 uint16_t buf;
 147                                 for (buf = nb_tx; buf < nb_rx; buf++)
 148                                         rte_pktmbuf_free(bufs[buf]);
 149                         }
 150                 }
 151         }
 152 }
 153
 154 /*
 155  * The main function, which does initialization and calls the per-lcore
 156  * functions.
 157  */
 158 int
 159 main(int argc, char *argv[])
 160 {
 161         struct rte_mempool *mbuf_pool;
 162         unsigned nb_ports;
 163         uint16_t portid;
 164
 165         /* Initialize the Environment Abstraction Layer (EAL). */
 166         int ret = rte_eal_init(argc, argv);
 167         if (ret < 0)
 168                 rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
 169
 170         argc -= ret;
 171         argv += ret;
 172
 173         /* Check that there is an even number of ports to send/receive on. */
 174         nb_ports = rte_eth_dev_count_avail();
 175         if (nb_ports < 2 || (nb_ports & 1))
 176                 rte_exit(EXIT_FAILURE, "Error: number of ports must be even\n");
 177
 178         /* Creates a new mempool in memory to hold the mbufs. */
 179         mbuf_pool = rte_pktmbuf_pool_create("MBUF_POOL", NUM_MBUFS * nb_ports,
 180                 MBUF_CACHE_SIZE, 0, RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id());
 181
 182         if (mbuf_pool == NULL)
 183                 rte_exit(EXIT_FAILURE, "Cannot create mbuf pool\n");
 184
 185         /* Initialize all ports. */
 186         RTE_ETH_FOREACH_DEV(portid)
 187                 if (port_init(portid, mbuf_pool) != 0)
 188                         rte_exit(EXIT_FAILURE, "Cannot init port %"PRIu16 "\n",
 189                                         portid);
 190
 191         if (rte_lcore_count() > 1)
 192                 printf("\nWARNING: Too many lcores enabled. Only 1 used.\n");
 193
 194         /* Call lcore_main on the master core only. */
 195         lcore_main();
 196
 197         return 0;
 198 }