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 }; 98