summaryrefslogtreecommitdiffstats
path: root/examples/multi_process/symmetric_mp/main.c
blob: 1ada4ef5167c554691d5dc2e4837b6626993ecc2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2014 Intel Corporation
 */

/*
 * Sample application demostrating how to do packet I/O in a multi-process
 * environment. The same code can be run as a primary process and as a
 * secondary process, just with a different proc-id parameter in each case
 * (apart from the EAL flag to indicate a secondary process).
 *
 * Each process will read from the same ports, given by the port-mask
 * parameter, which should be the same in each case, just using a different
 * queue per port as determined by the proc-id parameter.
 */

#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdarg.h>
#include <errno.h>
#include <sys/queue.h>
#include <getopt.h>
#include <signal.h>
#include <inttypes.h>

#include <rte_common.h>
#include <rte_log.h>
#include <rte_memory.h>
#include <rte_launch.h>
#include <rte_eal.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
#include <rte_atomic.h>
#include <rte_branch_prediction.h>
#include <rte_debug.h>
#include <rte_interrupts.h>
#include <rte_ether.h>
#include <rte_ethdev.h>
#include <rte_mempool.h>
#include <rte_memcpy.h>
#include <rte_mbuf.h>
#include <rte_string_fns.h>
#include <rte_cycles.h>

#define RTE_LOGTYPE_APP RTE_LOGTYPE_USER1

#define NB_MBUFS 64*1024 /* use 64k mbufs */
#define MBUF_CACHE_SIZE 256
#define PKT_BURST 32
#define RX_RING_SIZE 1024
#define TX_RING_SIZE 1024

#define PARAM_PROC_ID "proc-id"
#define PARAM_NUM_PROCS "num-procs"

/* for each lcore, record the elements of the ports array to use */
struct lcore_ports{
	unsigned start_port;
	unsigned num_ports;
};

/* structure to record the rx and tx packets. Put two per cache line as ports
 * used in pairs */
struct port_stats{
	unsigned rx;
	unsigned tx;
	unsigned drop;
} __attribute__((aligned(RTE_CACHE_LINE_SIZE / 2)));

static int proc_id = -1;
static unsigned num_procs = 0;

static uint16_t ports[RTE_MAX_ETHPORTS];
static unsigned num_ports = 0;

static struct lcore_ports lcore_ports[RTE_MAX_LCORE];
static struct port_stats pstats[RTE_MAX_ETHPORTS];

/* prints the usage statement and quits with an error message */
static void
smp_usage(const char *prgname, const char *errmsg)
{
	printf("\nError: %s\n",errmsg);
	printf("\n%s [EAL options] -- -p <port mask> "
			"--"PARAM_NUM_PROCS" <n>"
			" --"PARAM_PROC_ID" <id>\n"
			"-p         : a hex bitmask indicating what ports are to be used\n"
			"--num-procs: the number of processes which will be used\n"
			"--proc-id  : the id of the current process (id < num-procs)\n"
			"\n",
			prgname);
	exit(1);
}


/* signal handler configured for SIGTERM and SIGINT to print stats on exit */
static void
print_stats(int signum)
{
	unsigned i;
	printf("\nExiting on signal %d\n\n", signum);
	for (i = 0; i < num_ports; i++){
		const uint8_t p_num = ports[i];
		printf("Port %u: RX - %u, TX - %u, Drop - %u\n", (unsigned)p_num,
				pstats[p_num].rx, pstats[p_num].tx, pstats[p_num].drop);
	}
	exit(0);
}

/* Parse the argument given in the command line of the application */
static int
smp_parse_args(int argc, char **argv)
{
	int opt, ret;
	char **argvopt;
	int option_index;
	unsigned i, port_mask = 0;
	char *prgname = argv[0];
	static struct option lgopts[] = {
			{PARAM_NUM_PROCS, 1, 0, 0},
			{PARAM_PROC_ID, 1, 0, 0},
			{NULL, 0, 0, 0}
	};

	argvopt = argv;

	while ((opt = getopt_long(argc, argvopt, "p:", \
			lgopts, &option_index)) != EOF) {

		switch (opt) {
		case 'p':
			port_mask = strtoull(optarg, NULL, 16);
			break;
			/* long options */
		case 0:
			if (strncmp(lgopts[option_index].name, PARAM_NUM_PROCS, 8) == 0)
				num_procs = atoi(optarg);
			else if (strncmp(lgopts[option_index].name, PARAM_PROC_ID, 7) == 0)
				proc_id = atoi(optarg);
			break;

		default:
			smp_usage(prgname, "Cannot parse all command-line arguments\n");
		}
	}

	if (optind >= 0)
		argv[optind-1] = prgname;

	if (proc_id < 0)
		smp_usage(prgname, "Invalid or missing proc-id parameter\n");
	if (rte_eal_process_type() == RTE_PROC_PRIMARY && num_procs == 0)
		smp_usage(prgname, "Invalid or missing num-procs parameter\n");
	if (port_mask == 0)
		smp_usage(prgname, "Invalid or missing port mask\n");

	/* get the port numbers from the port mask */
	for(i = 0; i < rte_eth_dev_count(); i++)
		if(port_mask & (1 << i))
			ports[num_ports++] = (uint8_t)i;

	ret = optind-1;
	optind = 1; /* reset getopt lib */

	return ret;
}

/*
 * Initialises a given port using global settings and with the rx buffers
 * coming from the mbuf_pool passed as parameter
 */
static inline int
smp_port_init(uint16_t port, struct rte_mempool *mbuf_pool,
	       uint16_t num_queues)
{
	struct rte_eth_conf port_conf = {
			.rxmode = {
				.mq_mode	= ETH_MQ_RX_RSS,
				.split_hdr_size = 0,
				.ignore_offload_bitfield = 1,
				.offloads = (DEV_RX_OFFLOAD_CHECKSUM |
					     DEV_RX_OFFLOAD_CRC_STRIP),
			},
			.rx_adv_conf = {
				.rss_conf = {
					.rss_key = NULL,
					.rss_hf = ETH_RSS_IP,
				},
			},
			.txmode = {
				.mq_mode = ETH_MQ_TX_NONE,
			}
	};
	const uint16_t rx_rings = num_queues, tx_rings = num_queues;
	struct rte_eth_dev_info info;
	struct rte_eth_rxconf rxq_conf;
	struct rte_eth_txconf txq_conf;
	int retval;
	uint16_t q;
	uint16_t nb_rxd = RX_RING_SIZE;
	uint16_t nb_txd = TX_RING_SIZE;

	if (rte_eal_process_type() == RTE_PROC_SECONDARY)
		return 0;

	if (port >= rte_eth_dev_count())
		return -1;

	printf("# Initialising port %u... ", port);
	fflush(stdout);

	rte_eth_dev_info_get(port, &info);
	info.default_rxconf.rx_drop_en = 1;

	if (info.tx_offload_capa & DEV_TX_OFFLOAD_MBUF_FAST_FREE)
		port_conf.txmode.offloads |=
			DEV_TX_OFFLOAD_MBUF_FAST_FREE;
	retval = rte_eth_dev_configure(port, rx_rings, tx_rings, &port_conf);
	if (retval < 0)
		return retval;

	retval = rte_eth_dev_adjust_nb_rx_tx_desc(port, &nb_rxd, &nb_txd);
	if (retval < 0)
		return retval;

	rxq_conf = info.default_rxconf;
	rxq_conf.offloads = port_conf.rxmode.offloads;
	for (q = 0; q < rx_rings; q ++) {
		retval = rte_eth_rx_queue_setup(port, q, nb_rxd,
				rte_eth_dev_socket_id(port),
				&rxq_conf,
				mbuf_pool);
		if (retval < 0)
			return retval;
	}

	txq_conf = info.default_txconf;
	txq_conf.txq_flags = ETH_TXQ_FLAGS_IGNORE;
	txq_conf.offloads = port_conf.txmode.offloads;
	for (q = 0; q < tx_rings; q ++) {
		retval = rte_eth_tx_queue_setup(port, q, nb_txd,
				rte_eth_dev_socket_id(port),
				&txq_conf);
		if (retval < 0)
			return retval;
	}

	rte_eth_promiscuous_enable(port);

	retval  = rte_eth_dev_start(port);
	if (retval < 0)
		return retval;

	return 0;
}

/* Goes through each of the lcores and calculates what ports should
 * be used by that core. Fills in the global lcore_ports[] array.
 */
static void
assign_ports_to_cores(void)
{

	const unsigned lcores = rte_eal_get_configuration()->lcore_count;
	const unsigned port_pairs = num_ports / 2;
	const unsigned pairs_per_lcore = port_pairs / lcores;
	unsigned extra_pairs = port_pairs % lcores;
	unsigned ports_assigned = 0;
	unsigned i;

	RTE_LCORE_FOREACH(i) {
		lcore_ports[i].start_port = ports_assigned;
		lcore_ports[i].num_ports = pairs_per_lcore * 2;
		if (extra_pairs > 0) {
			lcore_ports[i].num_ports += 2;
			extra_pairs--;
		}
		ports_assigned += lcore_ports[i].num_ports;
	}
}

/* Main function used by the processing threads.
 * Prints out some configuration details for the thread and then begins
 * performing packet RX and TX.
 */
static int
lcore_main(void *arg __rte_unused)
{
	const unsigned id = rte_lcore_id();
	const unsigned start_port = lcore_ports[id].start_port;
	const unsigned end_port = start_port + lcore_ports[id].num_ports;
	const uint16_t q_id = (uint16_t)proc_id;
	unsigned p, i;
	char msgbuf[256];
	int msgbufpos = 0;

	if (start_port == end_port){
		printf("Lcore %u has nothing to do\n", id);
		return 0;
	}

	/* build up message in msgbuf before printing to decrease likelihood
	 * of multi-core message interleaving.
	 */
	msgbufpos += snprintf(msgbuf, sizeof(msgbuf) - msgbufpos,
			"Lcore %u using ports ", id);
	for (p = start_port; p < end_port; p++){
		msgbufpos += snprintf(msgbuf + msgbufpos, sizeof(msgbuf) - msgbufpos,
				"%u ", (unsigned)ports[p]);
	}
	printf("%s\n", msgbuf);
	printf("lcore %u using queue %u of each port\n", id, (unsigned)q_id);

	/* handle packet I/O from the ports, reading and writing to the
	 * queue number corresponding to our process number (not lcore id)
	 */

	for (;;) {
		struct rte_mbuf *buf[PKT_BURST];

		for (p = start_port; p < end_port; p++) {
			const uint8_t src = ports[p];
			const uint8_t dst = ports[p ^ 1]; /* 0 <-> 1, 2 <-> 3 etc */
			const uint16_t rx_c = rte_eth_rx_burst(src, q_id, buf, PKT_BURST);
			if (rx_c == 0)
				continue;
			pstats[src].rx += rx_c;

			const uint16_t tx_c = rte_eth_tx_burst(dst, q_id, buf, rx_c);
			pstats[dst].tx += tx_c;
			if (tx_c != rx_c) {
				pstats[dst].drop += (rx_c - tx_c);
				for (i = tx_c; i < rx_c; i++)
					rte_pktmbuf_free(buf[i]);
			}
		}
	}
}

/* Check the link status of all ports in up to 9s, and print them finally */
static void
check_all_ports_link_status(uint16_t port_num, uint32_t port_mask)
{
#define CHECK_INTERVAL 100 /* 100ms */
#define MAX_CHECK_TIME 90 /* 9s (90 * 100ms) in total */
	uint16_t portid;
	uint8_t count, all_ports_up, print_flag = 0;
	struct rte_eth_link link;

	printf("\nChecking link status");
	fflush(stdout);
	for (count = 0; count <= MAX_CHECK_TIME; count++) {
		all_ports_up = 1;
		for (portid = 0; portid < port_num; portid++) {
			if ((port_mask & (1 << portid)) == 0)
				continue;
			memset(&link, 0, sizeof(link));
			rte_eth_link_get_nowait(portid, &link);
			/* print link status if flag set */
			if (print_flag == 1) {
				if (link.link_status)
					printf(
					"Port%d Link Up. Speed %u Mbps - %s\n",
						portid, link.link_speed,
				(link.link_duplex == ETH_LINK_FULL_DUPLEX) ?
					("full-duplex") : ("half-duplex\n"));
				else
					printf("Port %d Link Down\n", portid);
				continue;
			}
			/* clear all_ports_up flag if any link down */
			if (link.link_status == ETH_LINK_DOWN) {
				all_ports_up = 0;
				break;
			}
		}
		/* after finally printing all link status, get out */
		if (print_flag == 1)
			break;

		if (all_ports_up == 0) {
			printf(".");
			fflush(stdout);
			rte_delay_ms(CHECK_INTERVAL);
		}

		/* set the print_flag if all ports up or timeout */
		if (all_ports_up == 1 || count == (MAX_CHECK_TIME - 1)) {
			print_flag = 1;
			printf("done\n");
		}
	}
}

/* Main function.
 * Performs initialisation and then calls the lcore_main on each core
 * to do the packet-processing work.
 */
int
main(int argc, char **argv)
{
	static const char *_SMP_MBUF_POOL = "SMP_MBUF_POOL";
	int ret;
	unsigned i;
	enum rte_proc_type_t proc_type;
	struct rte_mempool *mp;

	/* set up signal handlers to print stats on exit */
	signal(SIGINT, print_stats);
	signal(SIGTERM, print_stats);

	/* initialise the EAL for all */
	ret = rte_eal_init(argc, argv);
	if (ret < 0)
		rte_exit(EXIT_FAILURE, "Cannot init EAL\n");
	argc -= ret;
	argv += ret;

	/* determine the NIC devices available */
	if (rte_eth_dev_count() == 0)
		rte_exit(EXIT_FAILURE, "No Ethernet ports - bye\n");

	/* parse application arguments (those after the EAL ones) */
	smp_parse_args(argc, argv);

	proc_type = rte_eal_process_type();
	mp = (proc_type == RTE_PROC_SECONDARY) ?
			rte_mempool_lookup(_SMP_MBUF_POOL) :
			rte_pktmbuf_pool_create(_SMP_MBUF_POOL, NB_MBUFS,
				MBUF_CACHE_SIZE, 0, RTE_MBUF_DEFAULT_BUF_SIZE,
				rte_socket_id());
	if (mp == NULL)
		rte_exit(EXIT_FAILURE, "Cannot get memory pool for buffers\n");

	if (num_ports & 1)
		rte_exit(EXIT_FAILURE, "Application must use an even number of ports\n");
	for(i = 0; i < num_ports; i++){
		if(proc_type == RTE_PROC_PRIMARY)
			if (smp_port_init(ports[i], mp, (uint16_t)num_procs) < 0)
				rte_exit(EXIT_FAILURE, "Error initialising ports\n");
	}

	if (proc_type == RTE_PROC_PRIMARY)
		check_all_ports_link_status((uint8_t)num_ports, (~0x0));

	assign_ports_to_cores();

	RTE_LOG(INFO, APP, "Finished Process Init.\n");

	rte_eal_mp_remote_launch(lcore_main, NULL, CALL_MASTER);

	return 0;
}