summaryrefslogtreecommitdiff
path: root/examples/exception_path/main.c
blob: 440422bc8fca3b67be6cf3102bbda61fba424180 (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
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2014 Intel Corporation
 */

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

#include <netinet/in.h>
#include <net/if.h>
#ifdef RTE_EXEC_ENV_LINUXAPP
#include <linux/if_tun.h>
#endif
#include <fcntl.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <signal.h>

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

#ifndef APP_MAX_LCORE
#if (RTE_MAX_LCORE > 64)
#define APP_MAX_LCORE 64
#else
#define APP_MAX_LCORE RTE_MAX_LCORE
#endif
#endif

/* Macros for printing using RTE_LOG */
#define RTE_LOGTYPE_APP RTE_LOGTYPE_USER1
#define FATAL_ERROR(fmt, args...)       rte_exit(EXIT_FAILURE, fmt "\n", ##args)
#define PRINT_INFO(fmt, args...)        RTE_LOG(INFO, APP, fmt "\n", ##args)

/* Max ports than can be used (each port is associated with two lcores) */
#define MAX_PORTS               (APP_MAX_LCORE / 2)

/* Max size of a single packet */
#define MAX_PACKET_SZ (2048)

/* Size of the data buffer in each mbuf */
#define MBUF_DATA_SZ (MAX_PACKET_SZ + RTE_PKTMBUF_HEADROOM)

/* Number of mbufs in mempool that is created */
#define NB_MBUF                 8192

/* How many packets to attempt to read from NIC in one go */
#define PKT_BURST_SZ            32

/* How many objects (mbufs) to keep in per-lcore mempool cache */
#define MEMPOOL_CACHE_SZ        PKT_BURST_SZ

/* Number of RX ring descriptors */
#define NB_RXD                  1024

/* Number of TX ring descriptors */
#define NB_TXD                  1024

/*
 * RX and TX Prefetch, Host, and Write-back threshold values should be
 * carefully set for optimal performance. Consult the network
 * controller's datasheet and supporting DPDK documentation for guidance
 * on how these parameters should be set.
 */

/* Options for configuring ethernet port */
static struct rte_eth_conf port_conf = {
	.rxmode = {
		.offloads = DEV_RX_OFFLOAD_CRC_STRIP,
	},
	.txmode = {
		.mq_mode = ETH_MQ_TX_NONE,
	},
};

/* Mempool for mbufs */
static struct rte_mempool * pktmbuf_pool = NULL;

/* Mask of enabled ports */
static uint32_t ports_mask = 0;

/* Mask of cores that read from NIC and write to tap */
static uint64_t input_cores_mask = 0;

/* Mask of cores that read from tap and write to NIC */
static uint64_t output_cores_mask = 0;

/* Array storing port_id that is associated with each lcore */
static uint16_t port_ids[APP_MAX_LCORE];

/* Structure type for recording lcore-specific stats */
struct stats {
	uint64_t rx;
	uint64_t tx;
	uint64_t dropped;
} __rte_cache_aligned;

/* Array of lcore-specific stats */
static struct stats lcore_stats[APP_MAX_LCORE];

/* Print out statistics on packets handled */
static void
print_stats(void)
{
	unsigned i;

	printf("\n**Exception-Path example application statistics**\n"
	       "=======  ======  ============  ============  ===============\n"
	       " Lcore    Port            RX            TX    Dropped on TX\n"
	       "-------  ------  ------------  ------------  ---------------\n");
	RTE_LCORE_FOREACH(i) {
		/* limit ourselves to application supported cores only */
		if (i >= APP_MAX_LCORE)
			break;
		printf("%6u %7u %13"PRIu64" %13"PRIu64" %16"PRIu64"\n",
		       i, (unsigned)port_ids[i],
		       lcore_stats[i].rx, lcore_stats[i].tx,
		       lcore_stats[i].dropped);
	}
	printf("=======  ======  ============  ============  ===============\n");
}

/* Custom handling of signals to handle stats */
static void
signal_handler(int signum)
{
	/* When we receive a USR1 signal, print stats */
	if (signum == SIGUSR1) {
		print_stats();
	}

	/* When we receive a USR2 signal, reset stats */
	if (signum == SIGUSR2) {
		memset(&lcore_stats, 0, sizeof(lcore_stats));
		printf("\n**Statistics have been reset**\n");
		return;
	}
}

#ifdef RTE_EXEC_ENV_LINUXAPP
/*
 * Create a tap network interface, or use existing one with same name.
 * If name[0]='\0' then a name is automatically assigned and returned in name.
 */
static int tap_create(char *name)
{
	struct ifreq ifr;
	int fd, ret;

	fd = open("/dev/net/tun", O_RDWR);
	if (fd < 0)
		return fd;

	memset(&ifr, 0, sizeof(ifr));

	/* TAP device without packet information */
	ifr.ifr_flags = IFF_TAP | IFF_NO_PI;

	if (name && *name)
		snprintf(ifr.ifr_name, IFNAMSIZ, "%s", name);

	ret = ioctl(fd, TUNSETIFF, (void *) &ifr);
	if (ret < 0) {
		close(fd);
		return ret;
	}

	if (name)
		snprintf(name, IFNAMSIZ, "%s", ifr.ifr_name);

	return fd;
}
#else
/*
 * Find a free tap network interface, or create a new one.
 * The name is automatically assigned and returned in name.
 */
static int tap_create(char *name)
{
	int i, fd = -1;
	char devname[PATH_MAX];

	for (i = 0; i < 255; i++) {
		snprintf(devname, sizeof(devname), "/dev/tap%d", i);
		fd = open(devname, O_RDWR);
		if (fd >= 0 || errno != EBUSY)
			break;
	}

	if (name)
		snprintf(name, IFNAMSIZ, "tap%d", i);

	return fd;
}
#endif

/* Main processing loop */
static int
main_loop(__attribute__((unused)) void *arg)
{
	const unsigned lcore_id = rte_lcore_id();
	char tap_name[IFNAMSIZ];
	int tap_fd;

	if ((1ULL << lcore_id) & input_cores_mask) {
		/* Create new tap interface */
		snprintf(tap_name, IFNAMSIZ, "tap_dpdk_%.2u", lcore_id);
		tap_fd = tap_create(tap_name);
		if (tap_fd < 0)
			FATAL_ERROR("Could not create tap interface \"%s\" (%d)",
					tap_name, tap_fd);

		PRINT_INFO("Lcore %u is reading from port %u and writing to %s",
		           lcore_id, (unsigned)port_ids[lcore_id], tap_name);
		fflush(stdout);
		/* Loop forever reading from NIC and writing to tap */
		for (;;) {
			struct rte_mbuf *pkts_burst[PKT_BURST_SZ];
			unsigned i;
			const unsigned nb_rx =
					rte_eth_rx_burst(port_ids[lcore_id], 0,
					    pkts_burst, PKT_BURST_SZ);
			lcore_stats[lcore_id].rx += nb_rx;
			for (i = 0; likely(i < nb_rx); i++) {
				struct rte_mbuf *m = pkts_burst[i];
				/* Ignore return val from write() */
				int ret = write(tap_fd,
				                rte_pktmbuf_mtod(m, void*),
				                rte_pktmbuf_data_len(m));
				rte_pktmbuf_free(m);
				if (unlikely(ret < 0))
					lcore_stats[lcore_id].dropped++;
				else
					lcore_stats[lcore_id].tx++;
			}
		}
	}
	else if ((1ULL << lcore_id) & output_cores_mask) {
		/* Create new tap interface */
		snprintf(tap_name, IFNAMSIZ, "tap_dpdk_%.2u", lcore_id);
		tap_fd = tap_create(tap_name);
		if (tap_fd < 0)
			FATAL_ERROR("Could not create tap interface \"%s\" (%d)",
					tap_name, tap_fd);

		PRINT_INFO("Lcore %u is reading from %s and writing to port %u",
		           lcore_id, tap_name, (unsigned)port_ids[lcore_id]);
		fflush(stdout);
		/* Loop forever reading from tap and writing to NIC */
		for (;;) {
			int ret;
			struct rte_mbuf *m = rte_pktmbuf_alloc(pktmbuf_pool);
			if (m == NULL)
				continue;

			ret = read(tap_fd, rte_pktmbuf_mtod(m, void *),
				MAX_PACKET_SZ);
			lcore_stats[lcore_id].rx++;
			if (unlikely(ret < 0)) {
				FATAL_ERROR("Reading from %s interface failed",
				            tap_name);
			}
			m->nb_segs = 1;
			m->next = NULL;
			m->pkt_len = (uint16_t)ret;
			m->data_len = (uint16_t)ret;
			ret = rte_eth_tx_burst(port_ids[lcore_id], 0, &m, 1);
			if (unlikely(ret < 1)) {
				rte_pktmbuf_free(m);
				lcore_stats[lcore_id].dropped++;
			}
			else {
				lcore_stats[lcore_id].tx++;
			}
		}
	}
	else {
		PRINT_INFO("Lcore %u has nothing to do", lcore_id);
		return 0;
	}
	/*
	 * Tap file is closed automatically when program exits. Putting close()
	 * here will cause the compiler to give an error about unreachable code.
	 */
}

/* Display usage instructions */
static void
print_usage(const char *prgname)
{
	PRINT_INFO("\nUsage: %s [EAL options] -- -p PORTMASK -i IN_CORES -o OUT_CORES\n"
	           "    -p PORTMASK: hex bitmask of ports to use\n"
	           "    -i IN_CORES: hex bitmask of cores which read from NIC\n"
	           "    -o OUT_CORES: hex bitmask of cores which write to NIC",
	           prgname);
}

/* Convert string to unsigned number. 0 is returned if error occurs */
static uint64_t
parse_unsigned(const char *portmask)
{
	char *end = NULL;
	uint64_t num;

	num = strtoull(portmask, &end, 16);
	if ((portmask[0] == '\0') || (end == NULL) || (*end != '\0'))
		return 0;

	return (uint64_t)num;
}

/* Record affinities between ports and lcores in global port_ids[] array */
static void
setup_port_lcore_affinities(void)
{
	unsigned long i;
	uint16_t tx_port = 0;
	uint16_t rx_port = 0;

	/* Setup port_ids[] array, and check masks were ok */
	for (i = 0; i < APP_MAX_LCORE; i++) {
		if (!rte_lcore_is_enabled(i))
			continue;
		if (input_cores_mask & (1ULL << i)) {
			/* Skip ports that are not enabled */
			while ((ports_mask & (1 << rx_port)) == 0) {
				rx_port++;
				if (rx_port > (sizeof(ports_mask) * 8))
					goto fail; /* not enough ports */
			}

			port_ids[i] = rx_port++;
		} else if (output_cores_mask & (1ULL << (i & 0x3f))) {
			/* Skip ports that are not enabled */
			while ((ports_mask & (1 << tx_port)) == 0) {
				tx_port++;
				if (tx_port > (sizeof(ports_mask) * 8))
					goto fail; /* not enough ports */
			}

			port_ids[i] = tx_port++;
		}
	}

	if (rx_port != tx_port)
		goto fail; /* uneven number of cores in masks */

	if (ports_mask & (~((1 << rx_port) - 1)))
		goto fail; /* unused ports */

	return;
fail:
	FATAL_ERROR("Invalid core/port masks specified on command line");
}

/* Parse the arguments given in the command line of the application */
static void
parse_args(int argc, char **argv)
{
	int opt;
	const char *prgname = argv[0];

	/* Disable printing messages within getopt() */
	opterr = 0;

	/* Parse command line */
	while ((opt = getopt(argc, argv, "i:o:p:")) != EOF) {
		switch (opt) {
		case 'i':
			input_cores_mask = parse_unsigned(optarg);
			break;
		case 'o':
			output_cores_mask = parse_unsigned(optarg);
			break;
		case 'p':
			ports_mask = parse_unsigned(optarg);
			break;
		default:
			print_usage(prgname);
			FATAL_ERROR("Invalid option specified");
		}
	}

	/* Check that options were parsed ok */
	if (input_cores_mask == 0) {
		print_usage(prgname);
		FATAL_ERROR("IN_CORES not specified correctly");
	}
	if (output_cores_mask == 0) {
		print_usage(prgname);
		FATAL_ERROR("OUT_CORES not specified correctly");
	}
	if (ports_mask == 0) {
		print_usage(prgname);
		FATAL_ERROR("PORTMASK not specified correctly");
	}

	setup_port_lcore_affinities();
}

/* Initialise a single port on an Ethernet device */
static void
init_port(uint16_t port)
{
	int ret;
	uint16_t nb_rxd = NB_RXD;
	uint16_t nb_txd = NB_TXD;
	struct rte_eth_dev_info dev_info;
	struct rte_eth_rxconf rxq_conf;
	struct rte_eth_txconf txq_conf;
	struct rte_eth_conf local_port_conf = port_conf;

	/* Initialise device and RX/TX queues */
	PRINT_INFO("Initialising port %u ...", port);
	fflush(stdout);
	rte_eth_dev_info_get(port, &dev_info);
	if (dev_info.tx_offload_capa & DEV_TX_OFFLOAD_MBUF_FAST_FREE)
		local_port_conf.txmode.offloads |=
			DEV_TX_OFFLOAD_MBUF_FAST_FREE;
	ret = rte_eth_dev_configure(port, 1, 1, &local_port_conf);
	if (ret < 0)
		FATAL_ERROR("Could not configure port%u (%d)", port, ret);

	ret = rte_eth_dev_adjust_nb_rx_tx_desc(port, &nb_rxd, &nb_txd);
	if (ret < 0)
		FATAL_ERROR("Could not adjust number of descriptors for port%u (%d)",
			    port, ret);

	rxq_conf = dev_info.default_rxconf;
	rxq_conf.offloads = local_port_conf.rxmode.offloads;
	ret = rte_eth_rx_queue_setup(port, 0, nb_rxd,
				rte_eth_dev_socket_id(port),
				&rxq_conf,
				pktmbuf_pool);
	if (ret < 0)
		FATAL_ERROR("Could not setup up RX queue for port%u (%d)",
				port, ret);

	txq_conf = dev_info.default_txconf;
	txq_conf.offloads = local_port_conf.txmode.offloads;
	ret = rte_eth_tx_queue_setup(port, 0, nb_txd,
				rte_eth_dev_socket_id(port),
				&txq_conf);
	if (ret < 0)
		FATAL_ERROR("Could not setup up TX queue for port%u (%d)",
				port, ret);

	ret = rte_eth_dev_start(port);
	if (ret < 0)
		FATAL_ERROR("Could not start port%u (%d)", port, ret);

	rte_eth_promiscuous_enable(port);
}

/* Check the link status of all ports in up to 9s, and print them finally */
static void
check_all_ports_link_status(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;
		RTE_ETH_FOREACH_DEV(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");
		}
	}
}

/* Initialise ports/queues etc. and start main loop on each core */
int
main(int argc, char** argv)
{
	int ret;
	unsigned i,high_port;
	uint16_t nb_sys_ports, port;

	/* Associate signal_hanlder function with USR signals */
	signal(SIGUSR1, signal_handler);
	signal(SIGUSR2, signal_handler);

	/* Initialise EAL */
	ret = rte_eal_init(argc, argv);
	if (ret < 0)
		FATAL_ERROR("Could not initialise EAL (%d)", ret);
	argc -= ret;
	argv += ret;

	/* Parse application arguments (after the EAL ones) */
	parse_args(argc, argv);

	/* Create the mbuf pool */
	pktmbuf_pool = rte_pktmbuf_pool_create("mbuf_pool", NB_MBUF,
			MEMPOOL_CACHE_SZ, 0, MBUF_DATA_SZ, rte_socket_id());
	if (pktmbuf_pool == NULL) {
		FATAL_ERROR("Could not initialise mbuf pool");
		return -1;
	}

	/* Get number of ports found in scan */
	nb_sys_ports = rte_eth_dev_count_avail();
	if (nb_sys_ports == 0)
		FATAL_ERROR("No supported Ethernet device found");
	/* Find highest port set in portmask */
	for (high_port = (sizeof(ports_mask) * 8) - 1;
			(high_port != 0) && !(ports_mask & (1 << high_port));
			high_port--)
		; /* empty body */
	if (high_port > nb_sys_ports)
		FATAL_ERROR("Port mask requires more ports than available");

	/* Initialise each port */
	RTE_ETH_FOREACH_DEV(port) {
		/* Skip ports that are not enabled */
		if ((ports_mask & (1 << port)) == 0) {
			continue;
		}
		init_port(port);
	}
	check_all_ports_link_status(ports_mask);

	/* Launch per-lcore function on every lcore */
	rte_eal_mp_remote_launch(main_loop, NULL, CALL_MASTER);
	RTE_LCORE_FOREACH_SLAVE(i) {
		if (rte_eal_wait_lcore(i) < 0)
			return -1;
	}

	return 0;
}