ceph/src/dpdk/app/test-pmd/iofwd.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 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 <stdarg.h>
  35 #include <stdio.h>
  36 #include <string.h>
  37 #include <errno.h>
  38 #include <stdint.h>
  39 #include <unistd.h>
  40 #include <inttypes.h>
  41
  42 #include <sys/queue.h>
  43 #include <sys/stat.h>
  44
  45 #include <rte_common.h>
  46 #include <rte_byteorder.h>
  47 #include <rte_log.h>
  48 #include <rte_debug.h>
  49 #include <rte_cycles.h>
  50 #include <rte_memory.h>
  51 #include <rte_memzone.h>
  52 #include <rte_launch.h>
  53 #include <rte_eal.h>
  54 #include <rte_per_lcore.h>
  55 #include <rte_lcore.h>
  56 #include <rte_atomic.h>
  57 #include <rte_branch_prediction.h>
  58 #include <rte_memory.h>
  59 #include <rte_memcpy.h>
  60 #include <rte_mempool.h>
  61 #include <rte_mbuf.h>
  62 #include <rte_interrupts.h>
  63 #include <rte_pci.h>
  64 #include <rte_ether.h>
  65 #include <rte_ethdev.h>
  66 #include <rte_string_fns.h>
  67
  68 #include "testpmd.h"
  69
  70 /*
  71  * Forwarding of packets in I/O mode.
  72  * Forward packets "as-is".
  73  * This is the fastest possible forwarding operation, as it does not access
  74  * to packets data.
  75  */
  76 static void
  77 pkt_burst_io_forward(struct fwd_stream *fs)
  78 {
  79         struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
  80         uint16_t nb_rx;
  81         uint16_t nb_tx;
  82         uint32_t retry;
  83
  84 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
  85         uint64_t start_tsc;
  86         uint64_t end_tsc;
  87         uint64_t core_cycles;
  88 #endif
  89
  90 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
  91         start_tsc = rte_rdtsc();
  92 #endif
  93
  94         /*
  95          * Receive a burst of packets and forward them.
  96          */
  97         nb_rx = rte_eth_rx_burst(fs->rx_port, fs->rx_queue,
  98                         pkts_burst, nb_pkt_per_burst);
  99         if (unlikely(nb_rx == 0))
 100                 return;
 101         fs->rx_packets += nb_rx;
 102
 103 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
 104         fs->rx_burst_stats.pkt_burst_spread[nb_rx]++;
 105 #endif
 106         nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
 107                         pkts_burst, nb_rx);
 108         /*
 109          * Retry if necessary
 110          */
 111         if (unlikely(nb_tx < nb_rx) && fs->retry_enabled) {
 112                 retry = 0;
 113                 while (nb_tx < nb_rx && retry++ < burst_tx_retry_num) {
 114                         rte_delay_us(burst_tx_delay_time);
 115                         nb_tx += rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
 116                                         &pkts_burst[nb_tx], nb_rx - nb_tx);
 117                 }
 118         }
 119         fs->tx_packets += nb_tx;
 120 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
 121         fs->tx_burst_stats.pkt_burst_spread[nb_tx]++;
 122 #endif
 123         if (unlikely(nb_tx < nb_rx)) {
 124                 fs->fwd_dropped += (nb_rx - nb_tx);
 125                 do {
 126                         rte_pktmbuf_free(pkts_burst[nb_tx]);
 127                 } while (++nb_tx < nb_rx);
 128         }
 129 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
 130         end_tsc = rte_rdtsc();
 131         core_cycles = (end_tsc - start_tsc);
 132         fs->core_cycles = (uint64_t) (fs->core_cycles + core_cycles);
 133 #endif
 134 }
 135
 136 struct fwd_engine io_fwd_engine = {
 137         .fwd_mode_name  = "io",
 138         .port_fwd_begin = NULL,
 139         .port_fwd_end   = NULL,
 140         .packet_fwd     = pkt_burst_io_forward,
 141 };