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 }; 97