examples/rxtx_callbacks/main.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 <getopt.h>
   8 #include <rte_eal.h>
   9 #include <rte_ethdev.h>
  10 #include <rte_cycles.h>
  11 #include <rte_lcore.h>
  12 #include <rte_mbuf.h>
  13
  14 #define RX_RING_SIZE 1024
  15 #define TX_RING_SIZE 1024
  16
  17 #define NUM_MBUFS 8191
  18 #define MBUF_CACHE_SIZE 250
  19 #define BURST_SIZE 32
  20
  21 static const char usage[] =
  22         "%s EAL_ARGS -- [-t]\n";
  23
  24 static const struct rte_eth_conf port_conf_default = {
  25         .rxmode = {
  26                 .max_rx_pkt_len = RTE_ETHER_MAX_LEN,
  27         },
  28 };
  29
  30 static struct {
  31         uint64_t total_cycles;
  32         uint64_t total_queue_cycles;
  33         uint64_t total_pkts;
  34 } latency_numbers;
  35
  36 int hw_timestamping;
  37
  38 #define TICKS_PER_CYCLE_SHIFT 16
  39 static uint64_t ticks_per_cycle_mult;
  40
  41 static uint16_t
  42 add_timestamps(uint16_t port __rte_unused, uint16_t qidx __rte_unused,
  43                 struct rte_mbuf **pkts, uint16_t nb_pkts,
  44                 uint16_t max_pkts __rte_unused, void *_ __rte_unused)
  45 {
  46         unsigned i;
  47         uint64_t now = rte_rdtsc();
  48
  49         for (i = 0; i < nb_pkts; i++)
  50                 pkts[i]->udata64 = now;
  51         return nb_pkts;
  52 }
  53
  54 static uint16_t
  55 calc_latency(uint16_t port, uint16_t qidx __rte_unused,
  56                 struct rte_mbuf **pkts, uint16_t nb_pkts, void *_ __rte_unused)
  57 {
  58         uint64_t cycles = 0;
  59         uint64_t queue_ticks = 0;
  60         uint64_t now = rte_rdtsc();
  61         uint64_t ticks;
  62         unsigned i;
  63
  64         if (hw_timestamping)
  65                 rte_eth_read_clock(port, &ticks);
  66
  67         for (i = 0; i < nb_pkts; i++) {
  68                 cycles += now - pkts[i]->udata64;
  69                 if (hw_timestamping)
  70                         queue_ticks += ticks - pkts[i]->timestamp;
  71         }
  72
  73         latency_numbers.total_cycles += cycles;
  74         if (hw_timestamping)
  75                 latency_numbers.total_queue_cycles += (queue_ticks
  76                         * ticks_per_cycle_mult) >> TICKS_PER_CYCLE_SHIFT;
  77
  78         latency_numbers.total_pkts += nb_pkts;
  79
  80         if (latency_numbers.total_pkts > (100 * 1000 * 1000ULL)) {
  81                 printf("Latency = %"PRIu64" cycles\n",
  82                 latency_numbers.total_cycles / latency_numbers.total_pkts);
  83                 if (hw_timestamping) {
  84                         printf("Latency from HW = %"PRIu64" cycles\n",
  85                            latency_numbers.total_queue_cycles
  86                            / latency_numbers.total_pkts);
  87                 }
  88                 latency_numbers.total_cycles = 0;
  89                 latency_numbers.total_queue_cycles = 0;
  90                 latency_numbers.total_pkts = 0;
  91         }
  92         return nb_pkts;
  93 }
  94
  95 /*
  96  * Initialises a given port using global settings and with the rx buffers
  97  * coming from the mbuf_pool passed as parameter
  98  */
  99 static inline int
 100 port_init(uint16_t port, struct rte_mempool *mbuf_pool)
 101 {
 102         struct rte_eth_conf port_conf = port_conf_default;
 103         const uint16_t rx_rings = 1, tx_rings = 1;
 104         uint16_t nb_rxd = RX_RING_SIZE;
 105         uint16_t nb_txd = TX_RING_SIZE;
 106         int retval;
 107         uint16_t q;
 108         struct rte_eth_dev_info dev_info;
 109         struct rte_eth_rxconf rxconf;
 110         struct rte_eth_txconf txconf;
 111
 112         if (!rte_eth_dev_is_valid_port(port))
 113                 return -1;
 114
 115         retval = rte_eth_dev_info_get(port, &dev_info);
 116         if (retval != 0) {
 117                 printf("Error during getting device (port %u) info: %s\n",
 118                                 port, strerror(-retval));
 119
 120                 return retval;
 121         }
 122
 123         if (dev_info.tx_offload_capa & DEV_TX_OFFLOAD_MBUF_FAST_FREE)
 124                 port_conf.txmode.offloads |=
 125                         DEV_TX_OFFLOAD_MBUF_FAST_FREE;
 126
 127         if (hw_timestamping) {
 128                 if (!(dev_info.rx_offload_capa & DEV_RX_OFFLOAD_TIMESTAMP)) {
 129                         printf("\nERROR: Port %u does not support hardware timestamping\n"
 130                                         , port);
 131                         return -1;
 132                 }
 133                 port_conf.rxmode.offloads |= DEV_RX_OFFLOAD_TIMESTAMP;
 134         }
 135
 136         retval = rte_eth_dev_configure(port, rx_rings, tx_rings, &port_conf);
 137         if (retval != 0)
 138                 return retval;
 139
 140         retval = rte_eth_dev_adjust_nb_rx_tx_desc(port, &nb_rxd, &nb_txd);
 141         if (retval != 0)
 142                 return retval;
 143
 144         rxconf = dev_info.default_rxconf;
 145
 146         for (q = 0; q < rx_rings; q++) {
 147                 retval = rte_eth_rx_queue_setup(port, q, nb_rxd,
 148                         rte_eth_dev_socket_id(port), &rxconf, mbuf_pool);
 149                 if (retval < 0)
 150                         return retval;
 151         }
 152
 153         txconf = dev_info.default_txconf;
 154         txconf.offloads = port_conf.txmode.offloads;
 155         for (q = 0; q < tx_rings; q++) {
 156                 retval = rte_eth_tx_queue_setup(port, q, nb_txd,
 157                                 rte_eth_dev_socket_id(port), &txconf);
 158                 if (retval < 0)
 159                         return retval;
 160         }
 161
 162         retval  = rte_eth_dev_start(port);
 163         if (retval < 0)
 164                 return retval;
 165
 166         if (hw_timestamping && ticks_per_cycle_mult  == 0) {
 167                 uint64_t cycles_base = rte_rdtsc();
 168                 uint64_t ticks_base;
 169                 retval = rte_eth_read_clock(port, &ticks_base);
 170                 if (retval != 0)
 171                         return retval;
 172                 rte_delay_ms(100);
 173                 uint64_t cycles = rte_rdtsc();
 174                 uint64_t ticks;
 175                 rte_eth_read_clock(port, &ticks);
 176                 uint64_t c_freq = cycles - cycles_base;
 177                 uint64_t t_freq = ticks - ticks_base;
 178                 double freq_mult = (double)c_freq / t_freq;
 179                 printf("TSC Freq ~= %" PRIu64
 180                                 "\nHW Freq ~= %" PRIu64
 181                                 "\nRatio : %f\n",
 182                                 c_freq * 10, t_freq * 10, freq_mult);
 183                 /* TSC will be faster than internal ticks so freq_mult is > 0
 184                  * We convert the multiplication to an integer shift & mult
 185                  */
 186                 ticks_per_cycle_mult = (1 << TICKS_PER_CYCLE_SHIFT) / freq_mult;
 187         }
 188
 189         struct rte_ether_addr addr;
 190
 191         rte_eth_macaddr_get(port, &addr);
 192         printf("Port %u MAC: %02"PRIx8" %02"PRIx8" %02"PRIx8
 193                         " %02"PRIx8" %02"PRIx8" %02"PRIx8"\n",
 194                         (unsigned)port,
 195                         addr.addr_bytes[0], addr.addr_bytes[1],
 196                         addr.addr_bytes[2], addr.addr_bytes[3],
 197                         addr.addr_bytes[4], addr.addr_bytes[5]);
 198
 199         retval = rte_eth_promiscuous_enable(port);
 200         if (retval != 0)
 201                 return retval;
 202
 203         rte_eth_add_rx_callback(port, 0, add_timestamps, NULL);
 204         rte_eth_add_tx_callback(port, 0, calc_latency, NULL);
 205
 206         return 0;
 207 }
 208
 209 /*
 210  * Main thread that does the work, reading from INPUT_PORT
 211  * and writing to OUTPUT_PORT
 212  */
 213 static  __attribute__((noreturn)) void
 214 lcore_main(void)
 215 {
 216         uint16_t port;
 217
 218         RTE_ETH_FOREACH_DEV(port)
 219                 if (rte_eth_dev_socket_id(port) > 0 &&
 220                                 rte_eth_dev_socket_id(port) !=
 221                                                 (int)rte_socket_id())
 222                         printf("WARNING, port %u is on remote NUMA node to "
 223                                         "polling thread.\n\tPerformance will "
 224                                         "not be optimal.\n", port);
 225
 226         printf("\nCore %u forwarding packets. [Ctrl+C to quit]\n",
 227                         rte_lcore_id());
 228         for (;;) {
 229                 RTE_ETH_FOREACH_DEV(port) {
 230                         struct rte_mbuf *bufs[BURST_SIZE];
 231                         const uint16_t nb_rx = rte_eth_rx_burst(port, 0,
 232                                         bufs, BURST_SIZE);
 233                         if (unlikely(nb_rx == 0))
 234                                 continue;
 235                         const uint16_t nb_tx = rte_eth_tx_burst(port ^ 1, 0,
 236                                         bufs, nb_rx);
 237                         if (unlikely(nb_tx < nb_rx)) {
 238                                 uint16_t buf;
 239
 240                                 for (buf = nb_tx; buf < nb_rx; buf++)
 241                                         rte_pktmbuf_free(bufs[buf]);
 242                         }
 243                 }
 244         }
 245 }
 246
 247 /* Main function, does initialisation and calls the per-lcore functions */
 248 int
 249 main(int argc, char *argv[])
 250 {
 251         struct rte_mempool *mbuf_pool;
 252         uint16_t nb_ports;
 253         uint16_t portid;
 254         struct option lgopts[] = {
 255                 { NULL,  0, 0, 0 }
 256         };
 257         int opt, option_index;
 258
 259
 260         /* init EAL */
 261         int ret = rte_eal_init(argc, argv);
 262
 263         if (ret < 0)
 264                 rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
 265         argc -= ret;
 266         argv += ret;
 267
 268         while ((opt = getopt_long(argc, argv, "t", lgopts, &option_index))
 269                         != EOF)
 270                 switch (opt) {
 271                 case 't':
 272                         hw_timestamping = 1;
 273                         break;
 274                 default:
 275                         printf(usage, argv[0]);
 276                         return -1;
 277                 }
 278         optind = 1; /* reset getopt lib */
 279
 280         nb_ports = rte_eth_dev_count_avail();
 281         if (nb_ports < 2 || (nb_ports & 1))
 282                 rte_exit(EXIT_FAILURE, "Error: number of ports must be even\n");
 283
 284         mbuf_pool = rte_pktmbuf_pool_create("MBUF_POOL",
 285                 NUM_MBUFS * nb_ports, MBUF_CACHE_SIZE, 0,
 286                 RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id());
 287         if (mbuf_pool == NULL)
 288                 rte_exit(EXIT_FAILURE, "Cannot create mbuf pool\n");
 289
 290         /* initialize all ports */
 291         RTE_ETH_FOREACH_DEV(portid)
 292                 if (port_init(portid, mbuf_pool) != 0)
 293                         rte_exit(EXIT_FAILURE, "Cannot init port %"PRIu8"\n",
 294                                         portid);
 295
 296         if (rte_lcore_count() > 1)
 297                 printf("\nWARNING: Too much enabled lcores - "
 298                         "App uses only 1 lcore\n");
 299
 300         /* call lcore_main on master core only */
 301         lcore_main();
 302         return 0;
 303 }