app/test-pmd/iofwd.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #include <stdarg.h>
   6 #include <stdio.h>
   7 #include <string.h>
   8 #include <errno.h>
   9 #include <stdint.h>
  10 #include <unistd.h>
  11 #include <inttypes.h>
  12
  13 #include <sys/queue.h>
  14 #include <sys/stat.h>
  15
  16 #include <rte_common.h>
  17 #include <rte_byteorder.h>
  18 #include <rte_log.h>
  19 #include <rte_debug.h>
  20 #include <rte_cycles.h>
  21 #include <rte_memory.h>
  22 #include <rte_launch.h>
  23 #include <rte_eal.h>
  24 #include <rte_per_lcore.h>
  25 #include <rte_lcore.h>
  26 #include <rte_branch_prediction.h>
  27 #include <rte_memcpy.h>
  28 #include <rte_mempool.h>
  29 #include <rte_mbuf.h>
  30 #include <rte_interrupts.h>
  31 #include <rte_pci.h>
  32 #include <rte_ether.h>
  33 #include <rte_ethdev.h>
  34 #include <rte_string_fns.h>
  35 #include <rte_flow.h>
  36
  37 #include "testpmd.h"
  38
  39 /*
  40  * Forwarding of packets in I/O mode.
  41  * Forward packets "as-is".
  42  * This is the fastest possible forwarding operation, as it does not access
  43  * to packets data.
  44  */
  45 static void
  46 pkt_burst_io_forward(struct fwd_stream *fs)
  47 {
  48         struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
  49         uint16_t nb_rx;
  50         uint16_t nb_tx;
  51         uint32_t retry;
  52         uint64_t start_tsc = 0;
  53
  54         get_start_cycles(&start_tsc);
  55
  56         /*
  57          * Receive a burst of packets and forward them.
  58          */
  59         nb_rx = rte_eth_rx_burst(fs->rx_port, fs->rx_queue,
  60                         pkts_burst, nb_pkt_per_burst);
  61         inc_rx_burst_stats(fs, nb_rx);
  62         if (unlikely(nb_rx == 0))
  63                 return;
  64         fs->rx_packets += nb_rx;
  65
  66         nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
  67                         pkts_burst, nb_rx);
  68         /*
  69          * Retry if necessary
  70          */
  71         if (unlikely(nb_tx < nb_rx) && fs->retry_enabled) {
  72                 retry = 0;
  73                 while (nb_tx < nb_rx && retry++ < burst_tx_retry_num) {
  74                         rte_delay_us(burst_tx_delay_time);
  75                         nb_tx += rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
  76                                         &pkts_burst[nb_tx], nb_rx - nb_tx);
  77                 }
  78         }
  79         fs->tx_packets += nb_tx;
  80         inc_tx_burst_stats(fs, nb_tx);
  81         if (unlikely(nb_tx < nb_rx)) {
  82                 fs->fwd_dropped += (nb_rx - nb_tx);
  83                 do {
  84                         rte_pktmbuf_free(pkts_burst[nb_tx]);
  85                 } while (++nb_tx < nb_rx);
  86         }
  87
  88         get_end_cycles(fs, start_tsc);
  89 }
  90
  91 struct fwd_engine io_fwd_engine = {
  92         .fwd_mode_name  = "io",
  93         .port_fwd_begin = NULL,
  94         .port_fwd_end   = NULL,
  95         .packet_fwd     = pkt_burst_io_forward,
  96 };