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