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42 #include <sys/queue.h>
45 #include <rte_common.h>
46 #include <rte_byteorder.h>
48 #include <rte_debug.h>
49 #include <rte_cycles.h>
50 #include <rte_memory.h>
51 #include <rte_memzone.h>
52 #include <rte_launch.h>
54 #include <rte_per_lcore.h>
55 #include <rte_lcore.h>
56 #include <rte_atomic.h>
57 #include <rte_branch_prediction.h>
58 #include <rte_memory.h>
59 #include <rte_memcpy.h>
60 #include <rte_mempool.h>
62 #include <rte_interrupts.h>
64 #include <rte_ether.h>
65 #include <rte_ethdev.h>
66 #include <rte_string_fns.h>
72 * Forwarding of packets in I/O mode.
73 * Forward packets "as-is".
74 * This is the fastest possible forwarding operation, as it does not access
78 pkt_burst_io_forward(struct fwd_stream *fs)
80 struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
85 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
91 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
92 start_tsc = rte_rdtsc();
96 * Receive a burst of packets and forward them.
98 nb_rx = rte_eth_rx_burst(fs->rx_port, fs->rx_queue,
99 pkts_burst, nb_pkt_per_burst);
100 if (unlikely(nb_rx == 0))
102 fs->rx_packets += nb_rx;
104 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
105 fs->rx_burst_stats.pkt_burst_spread[nb_rx]++;
107 nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
112 if (unlikely(nb_tx < nb_rx) && fs->retry_enabled) {
114 while (nb_tx < nb_rx && retry++ < burst_tx_retry_num) {
115 rte_delay_us(burst_tx_delay_time);
116 nb_tx += rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
117 &pkts_burst[nb_tx], nb_rx - nb_tx);
120 fs->tx_packets += nb_tx;
121 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
122 fs->tx_burst_stats.pkt_burst_spread[nb_tx]++;
124 if (unlikely(nb_tx < nb_rx)) {
125 fs->fwd_dropped += (nb_rx - nb_tx);
127 rte_pktmbuf_free(pkts_burst[nb_tx]);
128 } while (++nb_tx < nb_rx);
130 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
131 end_tsc = rte_rdtsc();
132 core_cycles = (end_tsc - start_tsc);
133 fs->core_cycles = (uint64_t) (fs->core_cycles + core_cycles);
137 struct fwd_engine io_fwd_engine = {
138 .fwd_mode_name = "io",
139 .port_fwd_begin = NULL,
140 .port_fwd_end = NULL,
141 .packet_fwd = pkt_burst_io_forward,