1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2016 Intel Corporation
3 */
4
5 #include <stdint.h>
6 #include <stdio.h>
7 #include <inttypes.h>
8 #include <stdarg.h>
9 #include <errno.h>
10 #include <sys/queue.h>
11 #include <stdlib.h>
12 #include <getopt.h>
13 #include <string.h>
14
15 #include <rte_common.h>
16 #include <rte_malloc.h>
17 #include <rte_memory.h>
18 #include <rte_memzone.h>
19 #include <rte_eal.h>
20 #include <rte_atomic.h>
21 #include <rte_branch_prediction.h>
22 #include <rte_log.h>
23 #include <rte_per_lcore.h>
24 #include <rte_lcore.h>
25 #include <rte_ring.h>
26 #include <rte_launch.h>
27 #include <rte_debug.h>
28 #include <rte_mempool.h>
29 #include <rte_mbuf.h>
30 #include <rte_interrupts.h>
31 #include <rte_ether.h>
32 #include <rte_ethdev.h>
33 #include <rte_string_fns.h>
34
35 #include "common.h"
36
37 /* Number of packets to attempt to read from queue */
38 #define PKT_READ_SIZE ((uint16_t)32)
39
40 /* our client id number - tells us which rx queue to read, and NIC TX
41 * queue to write to. */
42 static uint8_t client_id = 0;
43
44 #define MBQ_CAPACITY 32
45
46 /* maps input ports to output ports for packets */
47 static uint16_t output_ports[RTE_MAX_ETHPORTS];
48
49 /* buffers up a set of packet that are ready to send */
50 struct rte_eth_dev_tx_buffer *tx_buffer[RTE_MAX_ETHPORTS];
51
52 /* shared data from server. We update statistics here */
53 static volatile struct tx_stats *tx_stats;
54
55
56 /*
57 * print a usage message
58 */
59 static void
usage(const char * progname)60 usage(const char *progname)
61 {
62 printf("Usage: %s [EAL args] -- -n <client_id>\n\n", progname);
63 }
64
65 /*
66 * Convert the client id number from a string to an int.
67 */
68 static int
parse_client_num(const char * client)69 parse_client_num(const char *client)
70 {
71 char *end = NULL;
72 unsigned long temp;
73
74 if (client == NULL || *client == '\0')
75 return -1;
76
77 temp = strtoul(client, &end, 10);
78 if (end == NULL || *end != '\0')
79 return -1;
80
81 client_id = (uint8_t)temp;
82 return 0;
83 }
84
85 /*
86 * Parse the application arguments to the client app.
87 */
88 static int
parse_app_args(int argc,char * argv[])89 parse_app_args(int argc, char *argv[])
90 {
91 int option_index, opt;
92 char **argvopt = argv;
93 const char *progname = NULL;
94 static struct option lgopts[] = { /* no long options */
95 {NULL, 0, 0, 0 }
96 };
97 progname = argv[0];
98
99 while ((opt = getopt_long(argc, argvopt, "n:", lgopts,
100 &option_index)) != EOF){
101 switch (opt){
102 case 'n':
103 if (parse_client_num(optarg) != 0){
104 usage(progname);
105 return -1;
106 }
107 break;
108 default:
109 usage(progname);
110 return -1;
111 }
112 }
113 return 0;
114 }
115
116 /*
117 * Tx buffer error callback
118 */
119 static void
flush_tx_error_callback(struct rte_mbuf ** unsent,uint16_t count,void * userdata)120 flush_tx_error_callback(struct rte_mbuf **unsent, uint16_t count,
121 void *userdata) {
122 int i;
123 uint16_t port_id = (uintptr_t)userdata;
124
125 tx_stats->tx_drop[port_id] += count;
126
127 /* free the mbufs which failed from transmit */
128 for (i = 0; i < count; i++)
129 rte_pktmbuf_free(unsent[i]);
130
131 }
132
133 static void
configure_tx_buffer(uint16_t port_id,uint16_t size)134 configure_tx_buffer(uint16_t port_id, uint16_t size)
135 {
136 int ret;
137
138 /* Initialize TX buffers */
139 tx_buffer[port_id] = rte_zmalloc_socket("tx_buffer",
140 RTE_ETH_TX_BUFFER_SIZE(size), 0,
141 rte_eth_dev_socket_id(port_id));
142 if (tx_buffer[port_id] == NULL)
143 rte_exit(EXIT_FAILURE, "Cannot allocate buffer for tx on port %u\n",
144 port_id);
145
146 rte_eth_tx_buffer_init(tx_buffer[port_id], size);
147
148 ret = rte_eth_tx_buffer_set_err_callback(tx_buffer[port_id],
149 flush_tx_error_callback, (void *)(intptr_t)port_id);
150 if (ret < 0)
151 rte_exit(EXIT_FAILURE,
152 "Cannot set error callback for tx buffer on port %u\n",
153 port_id);
154 }
155
156 /*
157 * set up output ports so that all traffic on port gets sent out
158 * its paired port. Index using actual port numbers since that is
159 * what comes in the mbuf structure.
160 */
161 static void
configure_output_ports(const struct port_info * ports)162 configure_output_ports(const struct port_info *ports)
163 {
164 int i;
165 if (ports->num_ports > RTE_MAX_ETHPORTS)
166 rte_exit(EXIT_FAILURE, "Too many ethernet ports. RTE_MAX_ETHPORTS = %u\n",
167 (unsigned)RTE_MAX_ETHPORTS);
168 for (i = 0; i < ports->num_ports - 1; i+=2){
169 uint16_t p1 = ports->id[i];
170 uint16_t p2 = ports->id[i+1];
171 output_ports[p1] = p2;
172 output_ports[p2] = p1;
173
174 configure_tx_buffer(p1, MBQ_CAPACITY);
175 configure_tx_buffer(p2, MBQ_CAPACITY);
176
177 }
178 }
179
180 /*
181 * This function performs routing of packets
182 * Just sends each input packet out an output port based solely on the input
183 * port it arrived on.
184 */
185 static void
handle_packet(struct rte_mbuf * buf)186 handle_packet(struct rte_mbuf *buf)
187 {
188 int sent;
189 const uint16_t in_port = buf->port;
190 const uint16_t out_port = output_ports[in_port];
191 struct rte_eth_dev_tx_buffer *buffer = tx_buffer[out_port];
192
193 sent = rte_eth_tx_buffer(out_port, client_id, buffer, buf);
194 if (sent)
195 tx_stats->tx[out_port] += sent;
196
197 }
198
199 /*
200 * Application main function - loops through
201 * receiving and processing packets. Never returns
202 */
203 int
main(int argc,char * argv[])204 main(int argc, char *argv[])
205 {
206 const struct rte_memzone *mz;
207 struct rte_ring *rx_ring;
208 struct rte_mempool *mp;
209 struct port_info *ports;
210 int need_flush = 0; /* indicates whether we have unsent packets */
211 int retval;
212 void *pkts[PKT_READ_SIZE];
213 uint16_t sent;
214
215 if ((retval = rte_eal_init(argc, argv)) < 0)
216 return -1;
217 argc -= retval;
218 argv += retval;
219
220 if (parse_app_args(argc, argv) < 0)
221 rte_exit(EXIT_FAILURE, "Invalid command-line arguments\n");
222
223 if (rte_eth_dev_count_avail() == 0)
224 rte_exit(EXIT_FAILURE, "No Ethernet ports - bye\n");
225
226 rx_ring = rte_ring_lookup(get_rx_queue_name(client_id));
227 if (rx_ring == NULL)
228 rte_exit(EXIT_FAILURE, "Cannot get RX ring - is server process running?\n");
229
230 mp = rte_mempool_lookup(PKTMBUF_POOL_NAME);
231 if (mp == NULL)
232 rte_exit(EXIT_FAILURE, "Cannot get mempool for mbufs\n");
233
234 mz = rte_memzone_lookup(MZ_PORT_INFO);
235 if (mz == NULL)
236 rte_exit(EXIT_FAILURE, "Cannot get port info structure\n");
237 ports = mz->addr;
238 tx_stats = &(ports->tx_stats[client_id]);
239
240 configure_output_ports(ports);
241
242 RTE_LOG(INFO, APP, "Finished Process Init.\n");
243
244 printf("\nClient process %d handling packets\n", client_id);
245 printf("[Press Ctrl-C to quit ...]\n");
246
247 for (;;) {
248 uint16_t i, rx_pkts;
249
250 rx_pkts = rte_ring_dequeue_burst(rx_ring, pkts,
251 PKT_READ_SIZE, NULL);
252
253 if (rx_pkts == 0 && need_flush) {
254 for (i = 0; i < ports->num_ports; i++) {
255 uint16_t port = ports->id[i];
256
257 sent = rte_eth_tx_buffer_flush(port,
258 client_id,
259 tx_buffer[port]);
260 tx_stats->tx[port] += sent;
261 }
262 need_flush = 0;
263 continue;
264 }
265
266 for (i = 0; i < rx_pkts; i++)
267 handle_packet(pkts[i]);
268
269 need_flush = 1;
270 }
271 }
272