1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation
13 #include <sys/queue.h>
16 #include <rte_common.h>
17 #include <rte_byteorder.h>
19 #include <rte_debug.h>
20 #include <rte_cycles.h>
21 #include <rte_memory.h>
22 #include <rte_launch.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>
31 #include <rte_interrupts.h>
33 #include <rte_ether.h>
34 #include <rte_ethdev.h>
35 #include <rte_string_fns.h>
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
47 pkt_burst_io_forward(struct fwd_stream *fs)
49 struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
53 uint64_t start_tsc = 0;
55 get_start_cycles(&start_tsc);
58 * Receive a burst of packets and forward them.
60 nb_rx = rte_eth_rx_burst(fs->rx_port, fs->rx_queue,
61 pkts_burst, nb_pkt_per_burst);
62 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
63 fs->rx_burst_stats.pkt_burst_spread[nb_rx]++;
65 if (unlikely(nb_rx == 0))
67 fs->rx_packets += nb_rx;
69 nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
74 if (unlikely(nb_tx < nb_rx) && fs->retry_enabled) {
76 while (nb_tx < nb_rx && retry++ < burst_tx_retry_num) {
77 rte_delay_us(burst_tx_delay_time);
78 nb_tx += rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
79 &pkts_burst[nb_tx], nb_rx - nb_tx);
82 fs->tx_packets += nb_tx;
83 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
84 fs->tx_burst_stats.pkt_burst_spread[nb_tx]++;
86 if (unlikely(nb_tx < nb_rx)) {
87 fs->fwd_dropped += (nb_rx - nb_tx);
89 rte_pktmbuf_free(pkts_burst[nb_tx]);
90 } while (++nb_tx < nb_rx);
93 get_end_cycles(fs, start_tsc);
96 struct fwd_engine io_fwd_engine = {
97 .fwd_mode_name = "io",
98 .port_fwd_begin = NULL,
100 .packet_fwd = pkt_burst_io_forward,