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_atomic.h>
  27 #include <rte_branch_prediction.h>
  28 #include <rte_memcpy.h>
  29 #include <rte_mempool.h>
  30 #include <rte_mbuf.h>
  31 #include <rte_interrupts.h>
  32 #include <rte_pci.h>
  33 #include <rte_ether.h>
  34 #include <rte_ethdev.h>
  35 #include <rte_string_fns.h>
  36 #include <rte_flow.h>
  37
  38 #include "testpmd.h"
  39
  40 /*
  41  * Forwarding of packets in I/O mode.
  42  * Forward packets "as-is".
  43  * This is the fastest possible forwarding operation, as it does not access
  44  * to packets data.
  45  */
  46 static void
  47 pkt_burst_io_forward(struct fwd_stream *fs)
  48 {
  49         struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
  50         uint16_t nb_rx;
  51         uint16_t nb_tx;
  52         uint32_t retry;
  53         uint64_t start_tsc = 0;
  54
  55         get_start_cycles(&start_tsc);
  56
  57         /*
  58          * Receive a burst of packets and forward them.
  59          */
  60         nb_rx = rte_eth_rx_burst(fs->rx_port, fs->rx_queue,
  61                         pkts_burst, nb_pkt_per_burst);
  62         inc_rx_burst_stats(fs, nb_rx);
  63         if (unlikely(nb_rx == 0))
  64                 return;
  65         fs->rx_packets += nb_rx;
  66
  67         nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
  68                         pkts_burst, nb_rx);
  69         /*
  70          * Retry if necessary
  71          */
  72         if (unlikely(nb_tx < nb_rx) && fs->retry_enabled) {
  73                 retry = 0;
  74                 while (nb_tx < nb_rx && retry++ < burst_tx_retry_num) {
  75                         rte_delay_us(burst_tx_delay_time);
  76                         nb_tx += rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
  77                                         &pkts_burst[nb_tx], nb_rx - nb_tx);
  78                 }
  79         }
  80         fs->tx_packets += nb_tx;
  81         inc_tx_burst_stats(fs, nb_tx);
  82         if (unlikely(nb_tx < nb_rx)) {
  83                 fs->fwd_dropped += (nb_rx - nb_tx);
  84                 do {
  85                         rte_pktmbuf_free(pkts_burst[nb_tx]);
  86                 } while (++nb_tx < nb_rx);
  87         }
  88
  89         get_end_cycles(fs, start_tsc);
  90 }
  91
  92 struct fwd_engine io_fwd_engine = {
  93         .fwd_mode_name  = "io",
  94         .port_fwd_begin = NULL,
  95         .port_fwd_end   = NULL,
  96         .packet_fwd     = pkt_burst_io_forward,
  97 };