1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2015 Intel Corporation
3 */
4
5 #include <stdint.h>
6 #include <stdlib.h>
7 #include <inttypes.h>
8 #include <rte_eal.h>
9 #include <rte_ethdev.h>
10 #include <rte_cycles.h>
11 #include <rte_lcore.h>
12 #include <rte_mbuf.h>
13
14 #define RX_RING_SIZE 1024
15 #define TX_RING_SIZE 1024
16
17 #define NUM_MBUFS 8191
18 #define MBUF_CACHE_SIZE 250
19 #define BURST_SIZE 32
20
21 /* basicfwd.c: Basic DPDK skeleton forwarding example. */
22
23 /*
24 * Initializes a given port using global settings and with the RX buffers
25 * coming from the mbuf_pool passed as a parameter.
26 */
27
28 /* Main functional part of port initialization. 8< */
29 static inline int
port_init(uint16_t port,struct rte_mempool * mbuf_pool)30 port_init(uint16_t port, struct rte_mempool *mbuf_pool)
31 {
32 struct rte_eth_conf port_conf;
33 const uint16_t rx_rings = 1, tx_rings = 1;
34 uint16_t nb_rxd = RX_RING_SIZE;
35 uint16_t nb_txd = TX_RING_SIZE;
36 int retval;
37 uint16_t q;
38 struct rte_eth_dev_info dev_info;
39 struct rte_eth_txconf txconf;
40
41 if (!rte_eth_dev_is_valid_port(port))
42 return -1;
43
44 memset(&port_conf, 0, sizeof(struct rte_eth_conf));
45
46 retval = rte_eth_dev_info_get(port, &dev_info);
47 if (retval != 0) {
48 printf("Error during getting device (port %u) info: %s\n",
49 port, strerror(-retval));
50 return retval;
51 }
52
53 if (dev_info.tx_offload_capa & RTE_ETH_TX_OFFLOAD_MBUF_FAST_FREE)
54 port_conf.txmode.offloads |=
55 RTE_ETH_TX_OFFLOAD_MBUF_FAST_FREE;
56
57 /* Configure the Ethernet device. */
58 retval = rte_eth_dev_configure(port, rx_rings, tx_rings, &port_conf);
59 if (retval != 0)
60 return retval;
61
62 retval = rte_eth_dev_adjust_nb_rx_tx_desc(port, &nb_rxd, &nb_txd);
63 if (retval != 0)
64 return retval;
65
66 /* Allocate and set up 1 RX queue per Ethernet port. */
67 for (q = 0; q < rx_rings; q++) {
68 retval = rte_eth_rx_queue_setup(port, q, nb_rxd,
69 rte_eth_dev_socket_id(port), NULL, mbuf_pool);
70 if (retval < 0)
71 return retval;
72 }
73
74 txconf = dev_info.default_txconf;
75 txconf.offloads = port_conf.txmode.offloads;
76 /* Allocate and set up 1 TX queue per Ethernet port. */
77 for (q = 0; q < tx_rings; q++) {
78 retval = rte_eth_tx_queue_setup(port, q, nb_txd,
79 rte_eth_dev_socket_id(port), &txconf);
80 if (retval < 0)
81 return retval;
82 }
83
84 /* Starting Ethernet port. 8< */
85 retval = rte_eth_dev_start(port);
86 /* >8 End of starting of ethernet port. */
87 if (retval < 0)
88 return retval;
89
90 /* Display the port MAC address. */
91 struct rte_ether_addr addr;
92 retval = rte_eth_macaddr_get(port, &addr);
93 if (retval != 0)
94 return retval;
95
96 printf("Port %u MAC: %02" PRIx8 " %02" PRIx8 " %02" PRIx8
97 " %02" PRIx8 " %02" PRIx8 " %02" PRIx8 "\n",
98 port, RTE_ETHER_ADDR_BYTES(&addr));
99
100 /* Enable RX in promiscuous mode for the Ethernet device. */
101 retval = rte_eth_promiscuous_enable(port);
102 /* End of setting RX port in promiscuous mode. */
103 if (retval != 0)
104 return retval;
105
106 return 0;
107 }
108 /* >8 End of main functional part of port initialization. */
109
110 /*
111 * The lcore main. This is the main thread that does the work, reading from
112 * an input port and writing to an output port.
113 */
114
115 /* Basic forwarding application lcore. 8< */
116 static __rte_noreturn void
lcore_main(void)117 lcore_main(void)
118 {
119 uint16_t port;
120
121 /*
122 * Check that the port is on the same NUMA node as the polling thread
123 * for best performance.
124 */
125 RTE_ETH_FOREACH_DEV(port)
126 if (rte_eth_dev_socket_id(port) >= 0 &&
127 rte_eth_dev_socket_id(port) !=
128 (int)rte_socket_id())
129 printf("WARNING, port %u is on remote NUMA node to "
130 "polling thread.\n\tPerformance will "
131 "not be optimal.\n", port);
132
133 printf("\nCore %u forwarding packets. [Ctrl+C to quit]\n",
134 rte_lcore_id());
135
136 /* Main work of application loop. 8< */
137 for (;;) {
138 /*
139 * Receive packets on a port and forward them on the paired
140 * port. The mapping is 0 -> 1, 1 -> 0, 2 -> 3, 3 -> 2, etc.
141 */
142 RTE_ETH_FOREACH_DEV(port) {
143
144 /* Get burst of RX packets, from first port of pair. */
145 struct rte_mbuf *bufs[BURST_SIZE];
146 const uint16_t nb_rx = rte_eth_rx_burst(port, 0,
147 bufs, BURST_SIZE);
148
149 if (unlikely(nb_rx == 0))
150 continue;
151
152 /* Send burst of TX packets, to second port of pair. */
153 const uint16_t nb_tx = rte_eth_tx_burst(port ^ 1, 0,
154 bufs, nb_rx);
155
156 /* Free any unsent packets. */
157 if (unlikely(nb_tx < nb_rx)) {
158 uint16_t buf;
159 for (buf = nb_tx; buf < nb_rx; buf++)
160 rte_pktmbuf_free(bufs[buf]);
161 }
162 }
163 }
164 /* >8 End of loop. */
165 }
166 /* >8 End Basic forwarding application lcore. */
167
168 /*
169 * The main function, which does initialization and calls the per-lcore
170 * functions.
171 */
172 int
main(int argc,char * argv[])173 main(int argc, char *argv[])
174 {
175 struct rte_mempool *mbuf_pool;
176 unsigned nb_ports;
177 uint16_t portid;
178
179 /* Initializion the Environment Abstraction Layer (EAL). 8< */
180 int ret = rte_eal_init(argc, argv);
181 if (ret < 0)
182 rte_exit(EXIT_FAILURE, "Error with EAL initialization\n");
183 /* >8 End of initialization the Environment Abstraction Layer (EAL). */
184
185 argc -= ret;
186 argv += ret;
187
188 /* Check that there is an even number of ports to send/receive on. */
189 nb_ports = rte_eth_dev_count_avail();
190 if (nb_ports < 2 || (nb_ports & 1))
191 rte_exit(EXIT_FAILURE, "Error: number of ports must be even\n");
192
193 /* Creates a new mempool in memory to hold the mbufs. */
194
195 /* Allocates mempool to hold the mbufs. 8< */
196 mbuf_pool = rte_pktmbuf_pool_create("MBUF_POOL", NUM_MBUFS * nb_ports,
197 MBUF_CACHE_SIZE, 0, RTE_MBUF_DEFAULT_BUF_SIZE, rte_socket_id());
198 /* >8 End of allocating mempool to hold mbuf. */
199
200 if (mbuf_pool == NULL)
201 rte_exit(EXIT_FAILURE, "Cannot create mbuf pool\n");
202
203 /* Initializing all ports. 8< */
204 RTE_ETH_FOREACH_DEV(portid)
205 if (port_init(portid, mbuf_pool) != 0)
206 rte_exit(EXIT_FAILURE, "Cannot init port %"PRIu16 "\n",
207 portid);
208 /* >8 End of initializing all ports. */
209
210 if (rte_lcore_count() > 1)
211 printf("\nWARNING: Too many lcores enabled. Only 1 used.\n");
212
213 /* Call lcore_main on the main core only. Called on single lcore. 8< */
214 lcore_main();
215 /* >8 End of called on single lcore. */
216
217 /* clean up the EAL */
218 rte_eal_cleanup();
219
220 return 0;
221 }
222