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