ceph/src/dpdk/examples/rxtx_callbacks/main.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <stdint.h>
  35 #include <inttypes.h>
  36 #include <rte_eal.h>
  37 #include <rte_ethdev.h>
  38 #include <rte_cycles.h>
  39 #include <rte_lcore.h>
  40 #include <rte_mbuf.h>
  41
  42 #define RX_RING_SIZE 128
  43 #define TX_RING_SIZE 512
  44
  45 #define NUM_MBUFS 8191
  46 #define MBUF_CACHE_SIZE 250
  47 #define BURST_SIZE 32
  48
  49 static const struct rte_eth_conf port_conf_default = {
  50         .rxmode = { .max_rx_pkt_len = ETHER_MAX_LEN, },
  51 };
  52
  53 static unsigned nb_ports;
  54
  55 static struct {
  56         uint64_t total_cycles;
  57         uint64_t total_pkts;
  58 } latency_numbers;
  59
  60
  61 static uint16_t
  62 add_timestamps(uint8_t port __rte_unused, uint16_t qidx __rte_unused,
  63                 struct rte_mbuf **pkts, uint16_t nb_pkts,
  64                 uint16_t max_pkts __rte_unused, void *_ __rte_unused)
  65 {
  66         unsigned i;
  67         uint64_t now = rte_rdtsc();
  68
  69         for (i = 0; i < nb_pkts; i++)
  70                 pkts[i]->udata64 = now;
  71         return nb_pkts;
  72 }
  73
  74 static uint16_t
  75 calc_latency(uint8_t port __rte_unused, uint16_t qidx __rte_unused,
  76                 struct rte_mbuf **pkts, uint16_t nb_pkts, void *_ __rte_unused)
  77 {
  78         uint64_t cycles = 0;
  79         uint64_t now = rte_rdtsc();
  80         unsigned i;
  81
  82         for (i = 0; i < nb_pkts; i++)
  83                 cycles += now - pkts[i]->udata64;
  84         latency_numbers.total_cycles += cycles;
  85         latency_numbers.total_pkts += nb_pkts;
  86
  87         if (latency_numbers.total_pkts > (100 * 1000 * 1000ULL)) {
  88                 printf("Latency = %"PRIu64" cycles\n",
  89                 latency_numbers.total_cycles / latency_numbers.total_pkts);
  90                 latency_numbers.total_cycles = 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(uint8_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         int retval;
 105         uint16_t q;
 106
 107         if (port >= rte_eth_dev_count())
 108                 return -1;
 109
 110         retval = rte_eth_dev_configure(port, rx_rings, tx_rings, &port_conf);
 111         if (retval != 0)
 112                 return retval;
 113
 114         for (q = 0; q < rx_rings; q++) {
 115                 retval = rte_eth_rx_queue_setup(port, q, RX_RING_SIZE,
 116                                 rte_eth_dev_socket_id(port), NULL, mbuf_pool);
 117                 if (retval < 0)
 118                         return retval;
 119         }
 120
 121         for (q = 0; q < tx_rings; q++) {
 122                 retval = rte_eth_tx_queue_setup(port, q, TX_RING_SIZE,
 123                                 rte_eth_dev_socket_id(port), NULL);
 124                 if (retval < 0)
 125                         return retval;
 126         }
 127
 128         retval  = rte_eth_dev_start(port);
 129         if (retval < 0)
 130                 return retval;
 131
 132         struct ether_addr addr;
 133
 134         rte_eth_macaddr_get(port, &addr);
 135         printf("Port %u MAC: %02"PRIx8" %02"PRIx8" %02"PRIx8
 136                         " %02"PRIx8" %02"PRIx8" %02"PRIx8"\n",
 137                         (unsigned)port,
 138                         addr.addr_bytes[0], addr.addr_bytes[1],
 139                         addr.addr_bytes[2], addr.addr_bytes[3],
 140                         addr.addr_bytes[4], addr.addr_bytes[5]);
 141
 142         rte_eth_promiscuous_enable(port);
 143         rte_eth_add_rx_callback(port, 0, add_timestamps, NULL);
 144         rte_eth_add_tx_callback(port, 0, calc_latency, NULL);
 145
 146         return 0;
 147 }
 148
 149 /*
 150  * Main thread that does the work, reading from INPUT_PORT
 151  * and writing to OUTPUT_PORT
 152  */
 153 static  __attribute__((noreturn)) void
 154 lcore_main(void)
 155 {
 156         uint8_t port;
 157
 158         for (port = 0; port < nb_ports; port++)
 159                 if (rte_eth_dev_socket_id(port) > 0 &&
 160                                 rte_eth_dev_socket_id(port) !=
 161                                                 (int)rte_socket_id())
 162                         printf("WARNING, port %u is on remote NUMA node to "
 163                                         "polling thread.\n\tPerformance will "
 164                                         "not be optimal.\n", port);
 165
 166         printf("\nCore %u forwarding packets. [Ctrl+C to quit]\n",
 167                         rte_lcore_id());
 168         for (;;) {
 169                 for (port = 0; port < nb_ports; port++) {
 170                         struct rte_mbuf *bufs[BURST_SIZE];
 171                         const uint16_t nb_rx = rte_eth_rx_burst(port, 0,
 172                                         bufs, BURST_SIZE);
 173                         if (unlikely(nb_rx == 0))
 174                                 continue;
 175                         const uint16_t nb_tx = rte_eth_tx_burst(port ^ 1, 0,
 176                                         bufs, nb_rx);
 177                         if (unlikely(nb_tx < nb_rx)) {
 178                                 uint16_t buf;
 179
 180                                 for (buf = nb_tx; buf < nb_rx; buf++)
 181                                         rte_pktmbuf_free(bufs[buf]);
 182                         }
 183                 }
 184         }
 185 }
 186
 187 /* Main function, does initialisation and calls the per-lcore functions */
 188 int
 189 main(int argc, char *argv[])
 190 {
 191         struct rte_mempool *mbuf_pool;
 192         uint8_t portid;
 193
 194         /* init EAL */
 195         int ret = rte_eal_init(argc, argv);
 196
 197         if (ret < 0)
 198                 rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
 199         argc -= ret;
 200         argv += ret;
 201
 202         nb_ports = rte_eth_dev_count();
 203         if (nb_ports < 2 || (nb_ports & 1))
 204                 rte_exit(EXIT_FAILURE, "Error: number of ports must be even\n");
 205
 206         mbuf_pool = rte_pktmbuf_pool_create("MBUF_POOL",
 207                 NUM_MBUFS * nb_ports, MBUF_CACHE_SIZE, 0,
 208                 RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id());
 209         if (mbuf_pool == NULL)
 210                 rte_exit(EXIT_FAILURE, "Cannot create mbuf pool\n");
 211
 212         /* initialize all ports */
 213         for (portid = 0; portid < nb_ports; portid++)
 214                 if (port_init(portid, mbuf_pool) != 0)
 215                         rte_exit(EXIT_FAILURE, "Cannot init port %"PRIu8"\n",
 216                                         portid);
 217
 218         if (rte_lcore_count() > 1)
 219                 printf("\nWARNING: Too much enabled lcores - "
 220                         "App uses only 1 lcore\n");
 221
 222         /* call lcore_main on master core only */
 223         lcore_main();
 224         return 0;
 225 }