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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_memcpy.h>
52 #include <rte_memzone.h>
53 #include <rte_launch.h>
55 #include <rte_per_lcore.h>
56 #include <rte_lcore.h>
57 #include <rte_atomic.h>
58 #include <rte_branch_prediction.h>
60 #include <rte_memory.h>
61 #include <rte_mempool.h>
63 #include <rte_interrupts.h>
65 #include <rte_ether.h>
66 #include <rte_ethdev.h>
68 #include <rte_string_fns.h>
72 #define BURST_TX_WAIT_US 10
73 #define BURST_TX_RETRIES 5
76 * Global variables that control number of retires and
77 * timeout (in us) between retires.
79 uint32_t burst_tx_delay_time = BURST_TX_WAIT_US;
80 uint32_t burst_tx_retry_num = BURST_TX_RETRIES;
83 * Forwarding of packets in MAC mode with a wait and retry on TX to reduce packet loss.
84 * Change the source and the destination Ethernet addressed of packets
85 * before forwarding them.
88 pkt_burst_mac_retry_forward(struct fwd_stream *fs)
90 struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
92 struct ether_hdr *eth_hdr;
97 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
100 uint64_t core_cycles;
103 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
104 start_tsc = rte_rdtsc();
108 * Receive a burst of packets and forward them.
110 nb_rx = rte_eth_rx_burst(fs->rx_port, fs->rx_queue, pkts_burst,
112 if (unlikely(nb_rx == 0))
115 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
116 fs->rx_burst_stats.pkt_burst_spread[nb_rx]++;
118 fs->rx_packets += nb_rx;
119 for (i = 0; i < nb_rx; i++) {
121 eth_hdr = rte_pktmbuf_mtod(mb, struct ether_hdr *);
122 ether_addr_copy(&peer_eth_addrs[fs->peer_addr],
124 ether_addr_copy(&ports[fs->tx_port].eth_addr,
127 nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue, pkts_burst, nb_rx);
130 * If not all packets have been TX'd then wait and retry.
132 if (unlikely(nb_tx < nb_rx)) {
133 for (retry = 0; retry < burst_tx_retry_num; retry++) {
134 rte_delay_us(burst_tx_delay_time);
135 nb_tx += rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
136 &pkts_burst[nb_tx], nb_rx - nb_tx);
142 fs->tx_packets += nb_tx;
143 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
144 fs->tx_burst_stats.pkt_burst_spread[nb_tx]++;
146 if (unlikely(nb_tx < nb_rx)) {
147 fs->fwd_dropped += (nb_rx - nb_tx);
149 rte_pktmbuf_free(pkts_burst[nb_tx]);
150 } while (++nb_tx < nb_rx);
152 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
153 end_tsc = rte_rdtsc();
154 core_cycles = (end_tsc - start_tsc);
155 fs->core_cycles = (uint64_t) (fs->core_cycles + core_cycles);
159 struct fwd_engine mac_retry_fwd_engine = {
160 .fwd_mode_name = "mac_retry",
161 .port_fwd_begin = NULL,
162 .port_fwd_end = NULL,
163 .packet_fwd = pkt_burst_mac_retry_forward,