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
pkt_burst_io_forward(struct fwd_stream * fs)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