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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>
54 #include <rte_tailq.h>
56 #include <rte_per_lcore.h>
57 #include <rte_lcore.h>
58 #include <rte_atomic.h>
59 #include <rte_branch_prediction.h>
61 #include <rte_memory.h>
62 #include <rte_mempool.h>
64 #include <rte_interrupts.h>
66 #include <rte_ether.h>
67 #include <rte_ethdev.h>
69 #include <rte_string_fns.h>
73 #define BURST_TX_WAIT_US 10
74 #define BURST_TX_RETRIES 5
77 * Global variables that control number of retires and
78 * timeout (in us) between retires.
80 uint32_t burst_tx_delay_time = BURST_TX_WAIT_US;
81 uint32_t burst_tx_retry_num = BURST_TX_RETRIES;
84 * Forwarding of packets in MAC mode with a wait and retry on TX to reduce packet loss.
85 * Change the source and the destination Ethernet addressed of packets
86 * before forwarding them.
89 pkt_burst_mac_retry_forward(struct fwd_stream *fs)
91 struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
93 struct ether_hdr *eth_hdr;
98 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
101 uint64_t core_cycles;
104 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
105 start_tsc = rte_rdtsc();
109 * Receive a burst of packets and forward them.
111 nb_rx = rte_eth_rx_burst(fs->rx_port, fs->rx_queue, pkts_burst,
113 if (unlikely(nb_rx == 0))
116 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
117 fs->rx_burst_stats.pkt_burst_spread[nb_rx]++;
119 fs->rx_packets += nb_rx;
120 for (i = 0; i < nb_rx; i++) {
122 eth_hdr = (struct ether_hdr *) mb->pkt.data;
123 ether_addr_copy(&peer_eth_addrs[fs->peer_addr],
125 ether_addr_copy(&ports[fs->tx_port].eth_addr,
128 nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue, pkts_burst, nb_rx);
131 * If not all packets have been TX'd then wait and retry.
133 if (unlikely(nb_tx < nb_rx)) {
134 for (retry = 0; retry < burst_tx_retry_num; retry++) {
135 rte_delay_us(burst_tx_delay_time);
136 nb_tx += rte_eth_tx_burst(fs->tx_port, fs->tx_queue,
137 &pkts_burst[nb_tx], nb_rx - nb_tx);
143 fs->tx_packets += nb_tx;
144 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
145 fs->tx_burst_stats.pkt_burst_spread[nb_tx]++;
147 if (unlikely(nb_tx < nb_rx)) {
148 fs->fwd_dropped += (nb_rx - nb_tx);
150 rte_pktmbuf_free(pkts_burst[nb_tx]);
151 } while (++nb_tx < nb_rx);
153 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
154 end_tsc = rte_rdtsc();
155 core_cycles = (end_tsc - start_tsc);
156 fs->core_cycles = (uint64_t) (fs->core_cycles + core_cycles);
160 struct fwd_engine mac_retry_fwd_engine = {
161 .fwd_mode_name = "mac_retry",
162 .port_fwd_begin = NULL,
163 .port_fwd_end = NULL,
164 .packet_fwd = pkt_burst_mac_retry_forward,