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         rte_eth_dev_info_get(port, &dev_info);
 116         if (dev_info.tx_offload_capa & DEV_TX_OFFLOAD_MBUF_FAST_FREE)
 117                 port_conf.txmode.offloads |=
 118                         DEV_TX_OFFLOAD_MBUF_FAST_FREE;
 119
 120         if (hw_timestamping) {
 121                 if (!(dev_info.rx_offload_capa & DEV_RX_OFFLOAD_TIMESTAMP)) {
 122                         printf("\nERROR: Port %u does not support hardware timestamping\n"
 123                                         , port);
 124                         return -1;
 125                 }
 126                 port_conf.rxmode.offloads |= DEV_RX_OFFLOAD_TIMESTAMP;
 127         }
 128
 129         retval = rte_eth_dev_configure(port, rx_rings, tx_rings, &port_conf);
 130         if (retval != 0)
 131                 return retval;
 132
 133         retval = rte_eth_dev_adjust_nb_rx_tx_desc(port, &nb_rxd, &nb_txd);
 134         if (retval != 0)
 135                 return retval;
 136
 137         rxconf = dev_info.default_rxconf;
 138
 139         for (q = 0; q < rx_rings; q++) {
 140                 retval = rte_eth_rx_queue_setup(port, q, nb_rxd,
 141                         rte_eth_dev_socket_id(port), &rxconf, mbuf_pool);
 142                 if (retval < 0)
 143                         return retval;
 144         }
 145
 146         txconf = dev_info.default_txconf;
 147         txconf.offloads = port_conf.txmode.offloads;
 148         for (q = 0; q < tx_rings; q++) {
 149                 retval = rte_eth_tx_queue_setup(port, q, nb_txd,
 150                                 rte_eth_dev_socket_id(port), &txconf);
 151                 if (retval < 0)
 152                         return retval;
 153         }
 154
 155         retval  = rte_eth_dev_start(port);
 156         if (retval < 0)
 157                 return retval;
 158
 159         if (hw_timestamping && ticks_per_cycle_mult  == 0) {
 160                 uint64_t cycles_base = rte_rdtsc();
 161                 uint64_t ticks_base;
 162                 retval = rte_eth_read_clock(port, &ticks_base);
 163                 if (retval != 0)
 164                         return retval;
 165                 rte_delay_ms(100);
 166                 uint64_t cycles = rte_rdtsc();
 167                 uint64_t ticks;
 168                 rte_eth_read_clock(port, &ticks);
 169                 uint64_t c_freq = cycles - cycles_base;
 170                 uint64_t t_freq = ticks - ticks_base;
 171                 double freq_mult = (double)c_freq / t_freq;
 172                 printf("TSC Freq ~= %" PRIu64
 173                                 "\nHW Freq ~= %" PRIu64
 174                                 "\nRatio : %f\n",
 175                                 c_freq * 10, t_freq * 10, freq_mult);
 176                 /* TSC will be faster than internal ticks so freq_mult is > 0
 177                  * We convert the multiplication to an integer shift & mult
 178                  */
 179                 ticks_per_cycle_mult = (1 << TICKS_PER_CYCLE_SHIFT) / freq_mult;
 180         }
 181
 182         struct rte_ether_addr addr;
 183
 184         rte_eth_macaddr_get(port, &addr);
 185         printf("Port %u MAC: %02"PRIx8" %02"PRIx8" %02"PRIx8
 186                         " %02"PRIx8" %02"PRIx8" %02"PRIx8"\n",
 187                         (unsigned)port,
 188                         addr.addr_bytes[0], addr.addr_bytes[1],
 189                         addr.addr_bytes[2], addr.addr_bytes[3],
 190                         addr.addr_bytes[4], addr.addr_bytes[5]);
 191
 192         rte_eth_promiscuous_enable(port);
 193         rte_eth_add_rx_callback(port, 0, add_timestamps, NULL);
 194         rte_eth_add_tx_callback(port, 0, calc_latency, NULL);
 195
 196         return 0;
 197 }
 198
 199 /*
 200  * Main thread that does the work, reading from INPUT_PORT
 201  * and writing to OUTPUT_PORT
 202  */
 203 static  __attribute__((noreturn)) void
 204 lcore_main(void)
 205 {
 206         uint16_t port;
 207
 208         RTE_ETH_FOREACH_DEV(port)
 209                 if (rte_eth_dev_socket_id(port) > 0 &&
 210                                 rte_eth_dev_socket_id(port) !=
 211                                                 (int)rte_socket_id())
 212                         printf("WARNING, port %u is on remote NUMA node to "
 213                                         "polling thread.\n\tPerformance will "
 214                                         "not be optimal.\n", port);
 215
 216         printf("\nCore %u forwarding packets. [Ctrl+C to quit]\n",
 217                         rte_lcore_id());
 218         for (;;) {
 219                 RTE_ETH_FOREACH_DEV(port) {
 220                         struct rte_mbuf *bufs[BURST_SIZE];
 221                         const uint16_t nb_rx = rte_eth_rx_burst(port, 0,
 222                                         bufs, BURST_SIZE);
 223                         if (unlikely(nb_rx == 0))
 224                                 continue;
 225                         const uint16_t nb_tx = rte_eth_tx_burst(port ^ 1, 0,
 226                                         bufs, nb_rx);
 227                         if (unlikely(nb_tx < nb_rx)) {
 228                                 uint16_t buf;
 229
 230                                 for (buf = nb_tx; buf < nb_rx; buf++)
 231                                         rte_pktmbuf_free(bufs[buf]);
 232                         }
 233                 }
 234         }
 235 }
 236
 237 /* Main function, does initialisation and calls the per-lcore functions */
 238 int
 239 main(int argc, char *argv[])
 240 {
 241         struct rte_mempool *mbuf_pool;
 242         uint16_t nb_ports;
 243         uint16_t portid;
 244         struct option lgopts[] = {
 245                 { NULL,  0, 0, 0 }
 246         };
 247         int opt, option_index;
 248
 249
 250         /* init EAL */
 251         int ret = rte_eal_init(argc, argv);
 252
 253         if (ret < 0)
 254                 rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
 255         argc -= ret;
 256         argv += ret;
 257
 258         while ((opt = getopt_long(argc, argv, "t", lgopts, &option_index))
 259                         != EOF)
 260                 switch (opt) {
 261                 case 't':
 262                         hw_timestamping = 1;
 263                         break;
 264                 default:
 265                         printf(usage, argv[0]);
 266                         return -1;
 267                 }
 268         optind = 1; /* reset getopt lib */
 269
 270         nb_ports = rte_eth_dev_count_avail();
 271         if (nb_ports < 2 || (nb_ports & 1))
 272                 rte_exit(EXIT_FAILURE, "Error: number of ports must be even\n");
 273
 274         mbuf_pool = rte_pktmbuf_pool_create("MBUF_POOL",
 275                 NUM_MBUFS * nb_ports, MBUF_CACHE_SIZE, 0,
 276                 RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id());
 277         if (mbuf_pool == NULL)
 278                 rte_exit(EXIT_FAILURE, "Cannot create mbuf pool\n");
 279
 280         /* initialize all ports */
 281         RTE_ETH_FOREACH_DEV(portid)
 282                 if (port_init(portid, mbuf_pool) != 0)
 283                         rte_exit(EXIT_FAILURE, "Cannot init port %"PRIu8"\n",
 284                                         portid);
 285
 286         if (rte_lcore_count() > 1)
 287                 printf("\nWARNING: Too much enabled lcores - "
 288                         "App uses only 1 lcore\n");
 289
 290         /* call lcore_main on master core only */
 291         lcore_main();
 292         return 0;
 293 }