aboutsummaryrefslogtreecommitdiffstats
path: root/app/test-pmd/icmpecho.c
blob: 6a4e750fc13742fa76f335c125c42373f6630845 (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
/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2013 6WIND
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * Neither the name of 6WIND S.A. nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <stdarg.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <stdint.h>
#include <unistd.h>
#include <inttypes.h>

#include <sys/queue.h>
#include <sys/stat.h>

#include <rte_common.h>
#include <rte_byteorder.h>
#include <rte_log.h>
#include <rte_debug.h>
#include <rte_cycles.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
#include <rte_atomic.h>
#include <rte_branch_prediction.h>
#include <rte_memory.h>
#include <rte_mempool.h>
#include <rte_mbuf.h>
#include <rte_ether.h>
#include <rte_ethdev.h>
#include <rte_arp.h>
#include <rte_ip.h>
#include <rte_icmp.h>
#include <rte_string_fns.h>

#include "testpmd.h"

static const char *
arp_op_name(uint16_t arp_op)
{
	switch (arp_op ) {
	case ARP_OP_REQUEST:
		return "ARP Request";
	case ARP_OP_REPLY:
		return "ARP Reply";
	case ARP_OP_REVREQUEST:
		return "Reverse ARP Request";
	case ARP_OP_REVREPLY:
		return "Reverse ARP Reply";
	case ARP_OP_INVREQUEST:
		return "Peer Identify Request";
	case ARP_OP_INVREPLY:
		return "Peer Identify Reply";
	default:
		break;
	}
	return "Unkwown ARP op";
}

static const char *
ip_proto_name(uint16_t ip_proto)
{
	static const char * ip_proto_names[] = {
		"IP6HOPOPTS", /**< IP6 hop-by-hop options */
		"ICMP",       /**< control message protocol */
		"IGMP",       /**< group mgmt protocol */
		"GGP",        /**< gateway^2 (deprecated) */
		"IPv4",       /**< IPv4 encapsulation */

		"UNASSIGNED",
		"TCP",        /**< transport control protocol */
		"ST",         /**< Stream protocol II */
		"EGP",        /**< exterior gateway protocol */
		"PIGP",       /**< private interior gateway */

		"RCC_MON",    /**< BBN RCC Monitoring */
		"NVPII",      /**< network voice protocol*/
		"PUP",        /**< pup */
		"ARGUS",      /**< Argus */
		"EMCON",      /**< EMCON */

		"XNET",       /**< Cross Net Debugger */
		"CHAOS",      /**< Chaos*/
		"UDP",        /**< user datagram protocol */
		"MUX",        /**< Multiplexing */
		"DCN_MEAS",   /**< DCN Measurement Subsystems */

		"HMP",        /**< Host Monitoring */
		"PRM",        /**< Packet Radio Measurement */
		"XNS_IDP",    /**< xns idp */
		"TRUNK1",     /**< Trunk-1 */
		"TRUNK2",     /**< Trunk-2 */

		"LEAF1",      /**< Leaf-1 */
		"LEAF2",      /**< Leaf-2 */
		"RDP",        /**< Reliable Data */
		"IRTP",       /**< Reliable Transaction */
		"TP4",        /**< tp-4 w/ class negotiation */

		"BLT",        /**< Bulk Data Transfer */
		"NSP",        /**< Network Services */
		"INP",        /**< Merit Internodal */
		"SEP",        /**< Sequential Exchange */
		"3PC",        /**< Third Party Connect */

		"IDPR",       /**< InterDomain Policy Routing */
		"XTP",        /**< XTP */
		"DDP",        /**< Datagram Delivery */
		"CMTP",       /**< Control Message Transport */
		"TPXX",       /**< TP++ Transport */

		"ILTP",       /**< IL transport protocol */
		"IPv6_HDR",   /**< IP6 header */
		"SDRP",       /**< Source Demand Routing */
		"IPv6_RTG",   /**< IP6 routing header */
		"IPv6_FRAG",  /**< IP6 fragmentation header */

		"IDRP",       /**< InterDomain Routing*/
		"RSVP",       /**< resource reservation */
		"GRE",        /**< General Routing Encap. */
		"MHRP",       /**< Mobile Host Routing */
		"BHA",        /**< BHA */

		"ESP",        /**< IP6 Encap Sec. Payload */
		"AH",         /**< IP6 Auth Header */
		"INLSP",      /**< Integ. Net Layer Security */
		"SWIPE",      /**< IP with encryption */
		"NHRP",       /**< Next Hop Resolution */

		"UNASSIGNED",
		"UNASSIGNED",
		"UNASSIGNED",
		"ICMPv6",     /**< ICMP6 */
		"IPv6NONEXT", /**< IP6 no next header */

		"Ipv6DSTOPTS",/**< IP6 destination option */
		"AHIP",       /**< any host internal protocol */
		"CFTP",       /**< CFTP */
		"HELLO",      /**< "hello" routing protocol */
		"SATEXPAK",   /**< SATNET/Backroom EXPAK */

		"KRYPTOLAN",  /**< Kryptolan */
		"RVD",        /**< Remote Virtual Disk */
		"IPPC",       /**< Pluribus Packet Core */
		"ADFS",       /**< Any distributed FS */
		"SATMON",     /**< Satnet Monitoring */

		"VISA",       /**< VISA Protocol */
		"IPCV",       /**< Packet Core Utility */
		"CPNX",       /**< Comp. Prot. Net. Executive */
		"CPHB",       /**< Comp. Prot. HeartBeat */
		"WSN",        /**< Wang Span Network */

		"PVP",        /**< Packet Video Protocol */
		"BRSATMON",   /**< BackRoom SATNET Monitoring */
		"ND",         /**< Sun net disk proto (temp.) */
		"WBMON",      /**< WIDEBAND Monitoring */
		"WBEXPAK",    /**< WIDEBAND EXPAK */

		"EON",        /**< ISO cnlp */
		"VMTP",       /**< VMTP */
		"SVMTP",      /**< Secure VMTP */
		"VINES",      /**< Banyon VINES */
		"TTP",        /**< TTP */

		"IGP",        /**< NSFNET-IGP */
		"DGP",        /**< dissimilar gateway prot. */
		"TCF",        /**< TCF */
		"IGRP",       /**< Cisco/GXS IGRP */
		"OSPFIGP",    /**< OSPFIGP */

		"SRPC",       /**< Strite RPC protocol */
		"LARP",       /**< Locus Address Resoloution */
		"MTP",        /**< Multicast Transport */
		"AX25",       /**< AX.25 Frames */
		"4IN4",       /**< IP encapsulated in IP */

		"MICP",       /**< Mobile Int.ing control */
		"SCCSP",      /**< Semaphore Comm. security */
		"ETHERIP",    /**< Ethernet IP encapsulation */
		"ENCAP",      /**< encapsulation header */
		"AES",        /**< any private encr. scheme */

		"GMTP",       /**< GMTP */
		"IPCOMP",     /**< payload compression (IPComp) */
		"UNASSIGNED",
		"UNASSIGNED",
		"PIM",        /**< Protocol Independent Mcast */
	};

	if (ip_proto < sizeof(ip_proto_names) / sizeof(ip_proto_names[0]))
		return ip_proto_names[ip_proto];
	switch (ip_proto) {
#ifdef IPPROTO_PGM
	case IPPROTO_PGM:  /**< PGM */
		return "PGM";
#endif
	case IPPROTO_SCTP:  /**< Stream Control Transport Protocol */
		return "SCTP";
#ifdef IPPROTO_DIVERT
	case IPPROTO_DIVERT: /**< divert pseudo-protocol */
		return "DIVERT";
#endif
	case IPPROTO_RAW: /**< raw IP packet */
		return "RAW";
	default:
		break;
	}
	return "UNASSIGNED";
}

static void
ipv4_addr_to_dot(uint32_t be_ipv4_addr, char *buf)
{
	uint32_t ipv4_addr;

	ipv4_addr = rte_be_to_cpu_32(be_ipv4_addr);
	sprintf(buf, "%d.%d.%d.%d", (ipv4_addr >> 24) & 0xFF,
		(ipv4_addr >> 16) & 0xFF, (ipv4_addr >> 8) & 0xFF,
		ipv4_addr & 0xFF);
}

static void
ether_addr_dump(const char *what, const struct ether_addr *ea)
{
	char buf[ETHER_ADDR_FMT_SIZE];

	ether_format_addr(buf, ETHER_ADDR_FMT_SIZE, ea);
	if (what)
		printf("%s", what);
	printf("%s", buf);
}

static void
ipv4_addr_dump(const char *what, uint32_t be_ipv4_addr)
{
	char buf[16];

	ipv4_addr_to_dot(be_ipv4_addr, buf);
	if (what)
		printf("%s", what);
	printf("%s", buf);
}

static uint16_t
ipv4_hdr_cksum(struct ipv4_hdr *ip_h)
{
	uint16_t *v16_h;
	uint32_t ip_cksum;

	/*
	 * Compute the sum of successive 16-bit words of the IPv4 header,
	 * skipping the checksum field of the header.
	 */
	v16_h = (unaligned_uint16_t *) ip_h;
	ip_cksum = v16_h[0] + v16_h[1] + v16_h[2] + v16_h[3] +
		v16_h[4] + v16_h[6] + v16_h[7] + v16_h[8] + v16_h[9];

	/* reduce 32 bit checksum to 16 bits and complement it */
	ip_cksum = (ip_cksum & 0xffff) + (ip_cksum >> 16);
	ip_cksum = (ip_cksum & 0xffff) + (ip_cksum >> 16);
	ip_cksum = (~ip_cksum) & 0x0000FFFF;
	return (ip_cksum == 0) ? 0xFFFF : (uint16_t) ip_cksum;
}

#define is_multicast_ipv4_addr(ipv4_addr) \
	(((rte_be_to_cpu_32((ipv4_addr)) >> 24) & 0x000000FF) == 0xE0)

/*
 * Receive a burst of packets, lookup for ICMP echo requets, and, if any,
 * send back ICMP echo replies.
 */
static void
reply_to_icmp_echo_rqsts(struct fwd_stream *fs)
{
	struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
	struct rte_mbuf *pkt;
	struct ether_hdr *eth_h;
	struct vlan_hdr *vlan_h;
	struct arp_hdr  *arp_h;
	struct ipv4_hdr *ip_h;
	struct icmp_hdr *icmp_h;
	struct ether_addr eth_addr;
	uint32_t retry;
	uint32_t ip_addr;
	uint16_t nb_rx;
	uint16_t nb_tx;
	uint16_t nb_replies;
	uint16_t eth_type;
	uint16_t vlan_id;
	uint16_t arp_op;
	uint16_t arp_pro;
	uint32_t cksum;
	uint8_t  i;
	int l2_len;
#ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
	uint64_t start_tsc;
	uint64_t end_tsc;
	uint64_t core_cycles;
#endif

#ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
	start_tsc = rte_rdtsc();
#endif

	/*
	 * First, receive a burst of packets.
	 */
	nb_rx = rte_eth_rx_burst(fs->rx_port, fs->rx_queue, pkts_burst,
				 nb_pkt_per_burst);
	if (unlikely(nb_rx == 0))
		return;

#ifdef RTE_TEST_PMD_RECORD_BURST_STATS
	fs->rx_burst_stats.pkt_burst_spread[nb_rx]++;
#endif
	fs->rx_packets += nb_rx;
	nb_replies = 0;
	for (i = 0; i < nb_rx; i++) {
		if (likely(i < nb_rx - 1))
			rte_prefetch0(rte_pktmbuf_mtod(pkts_burst[i + 1],
						       void *));
		pkt = pkts_burst[i];
		eth_h = rte_pktmbuf_mtod(pkt, struct ether_hdr *);
		eth_type = RTE_BE_TO_CPU_16(eth_h->ether_type);
		l2_len = sizeof(struct ether_hdr);
		if (verbose_level > 0) {
			printf("\nPort %d pkt-len=%u nb-segs=%u\n",
			       fs->rx_port, pkt->pkt_len, pkt->nb_segs);
			ether_addr_dump("  ETH:  src=", &eth_h->s_addr);
			ether_addr_dump(" dst=", &eth_h->d_addr);
		}
		if (eth_type == ETHER_TYPE_VLAN) {
			vlan_h = (struct vlan_hdr *)
				((char *)eth_h + sizeof(struct ether_hdr));
			l2_len  += sizeof(struct vlan_hdr);
			eth_type = rte_be_to_cpu_16(vlan_h->eth_proto);
			if (verbose_level > 0) {
				vlan_id = rte_be_to_cpu_16(vlan_h->vlan_tci)
					& 0xFFF;
				printf(" [vlan id=%u]", vlan_id);
			}
		}
		if (verbose_level > 0) {
			printf(" type=0x%04x\n", eth_type);
		}

		/* Reply to ARP requests */
		if (eth_type == ETHER_TYPE_ARP) {
			arp_h = (struct arp_hdr *) ((char *)eth_h + l2_len);
			arp_op = RTE_BE_TO_CPU_16(arp_h->arp_op);
			arp_pro = RTE_BE_TO_CPU_16(arp_h->arp_pro);
			if (verbose_level > 0) {
				printf("  ARP:  hrd=%d proto=0x%04x hln=%d "
				       "pln=%d op=%u (%s)\n",
				       RTE_BE_TO_CPU_16(arp_h->arp_hrd),
				       arp_pro, arp_h->arp_hln,
				       arp_h->arp_pln, arp_op,
				       arp_op_name(arp_op));
			}
			if ((RTE_BE_TO_CPU_16(arp_h->arp_hrd) !=
			     ARP_HRD_ETHER) ||
			    (arp_pro != ETHER_TYPE_IPv4) ||
			    (arp_h->arp_hln != 6) ||
			    (arp_h->arp_pln != 4)
			    ) {
				rte_pktmbuf_free(pkt);
				if (verbose_level > 0)
					printf("\n");
				continue;
			}
			if (verbose_level > 0) {
				ether_addr_copy(&arp_h->arp_data.arp_sha, &eth_addr);
				ether_addr_dump("        sha=", &eth_addr);
				ip_addr = arp_h->arp_data.arp_sip;
				ipv4_addr_dump(" sip=", ip_addr);
				printf("\n");
				ether_addr_copy(&arp_h->arp_data.arp_tha, &eth_addr);
				ether_addr_dump("        tha=", &eth_addr);
				ip_addr = arp_h->arp_data.arp_tip;
				ipv4_addr_dump(" tip=", ip_addr);
				printf("\n");
			}
			if (arp_op != ARP_OP_REQUEST) {
				rte_pktmbuf_free(pkt);
				continue;
			}

			/*
			 * Build ARP reply.
			 */

			/* Use source MAC address as destination MAC address. */
			ether_addr_copy(&eth_h->s_addr, &eth_h->d_addr);
			/* Set source MAC address with MAC address of TX port */
			ether_addr_copy(&ports[fs->tx_port].eth_addr,
					&eth_h->s_addr);

			arp_h->arp_op = rte_cpu_to_be_16(ARP_OP_REPLY);
			ether_addr_copy(&arp_h->arp_data.arp_tha, &eth_addr);
			ether_addr_copy(&arp_h->arp_data.arp_sha, &arp_h->arp_data.arp_tha);
			ether_addr_copy(&eth_h->s_addr, &arp_h->arp_data.arp_sha);

			/* Swap IP addresses in ARP payload */
			ip_addr = arp_h->arp_data.arp_sip;
			arp_h->arp_data.arp_sip = arp_h->arp_data.arp_tip;
			arp_h->arp_data.arp_tip = ip_addr;
			pkts_burst[nb_replies++] = pkt;
			continue;
		}

		if (eth_type != ETHER_TYPE_IPv4) {
			rte_pktmbuf_free(pkt);
			continue;
		}
		ip_h = (struct ipv4_hdr *) ((char *)eth_h + l2_len);
		if (verbose_level > 0) {
			ipv4_addr_dump("  IPV4: src=", ip_h->src_addr);
			ipv4_addr_dump(" dst=", ip_h->dst_addr);
			printf(" proto=%d (%s)\n",
			       ip_h->next_proto_id,
			       ip_proto_name(ip_h->next_proto_id));
		}

		/*
		 * Check if packet is a ICMP echo request.
		 */
		icmp_h = (struct icmp_hdr *) ((char *)ip_h +
					      sizeof(struct ipv4_hdr));
		if (! ((ip_h->next_proto_id == IPPROTO_ICMP) &&
		       (icmp_h->icmp_type == IP_ICMP_ECHO_REQUEST) &&
		       (icmp_h->icmp_code == 0))) {
			rte_pktmbuf_free(pkt);
			continue;
		}

		if (verbose_level > 0)
			printf("  ICMP: echo request seq id=%d\n",
			       rte_be_to_cpu_16(icmp_h->icmp_seq_nb));

		/*
		 * Prepare ICMP echo reply to be sent back.
		 * - switch ethernet source and destinations addresses,
		 * - use the request IP source address as the reply IP
		 *    destination address,
		 * - if the request IP destination address is a multicast
		 *   address:
		 *     - choose a reply IP source address different from the
		 *       request IP source address,
		 *     - re-compute the IP header checksum.
		 *   Otherwise:
		 *     - switch the request IP source and destination
		 *       addresses in the reply IP header,
		 *     - keep the IP header checksum unchanged.
		 * - set IP_ICMP_ECHO_REPLY in ICMP header.
		 * ICMP checksum is computed by assuming it is valid in the
		 * echo request and not verified.
		 */
		ether_addr_copy(&eth_h->s_addr, &eth_addr);
		ether_addr_copy(&eth_h->d_addr, &eth_h->s_addr);
		ether_addr_copy(&eth_addr, &eth_h->d_addr);
		ip_addr = ip_h->src_addr;
		if (is_multicast_ipv4_addr(ip_h->dst_addr)) {
			uint32_t ip_src;

			ip_src = rte_be_to_cpu_32(ip_addr);
			if ((ip_src & 0x00000003) == 1)
				ip_src = (ip_src & 0xFFFFFFFC) | 0x00000002;
			else
				ip_src = (ip_src & 0xFFFFFFFC) | 0x00000001;
			ip_h->src_addr = rte_cpu_to_be_32(ip_src);
			ip_h->dst_addr = ip_addr;
			ip_h->hdr_checksum = ipv4_hdr_cksum(ip_h);
		} else {
			ip_h->src_addr = ip_h->dst_addr;
			ip_h->dst_addr = ip_addr;
		}
		icmp_h->icmp_type = IP_ICMP_ECHO_REPLY;
		cksum = ~icmp_h->icmp_cksum & 0xffff;
		cksum += ~htons(IP_ICMP_ECHO_REQUEST << 8) & 0xffff;
		cksum += htons(IP_ICMP_ECHO_REPLY << 8);
		cksum = (cksum & 0xffff) + (cksum >> 16);
		cksum = (cksum & 0xffff) + (cksum >> 16);
		icmp_h->icmp_cksum = ~cksum;
		pkts_burst[nb_replies++] = pkt;
	}

	/* Send back ICMP echo replies, if any. */
	if (nb_replies > 0) {
		nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue, pkts_burst,
					 nb_replies);
		/*
		 * Retry if necessary
		 */
		if (unlikely(nb_tx < nb_replies) && fs->retry_enabled) {
			retry = 0;
			while (nb_tx < nb_replies &&
					retry++ < burst_tx_retry_num) {
				rte_delay_us(burst_tx_delay_time);
				nb_tx += rte_eth_tx_burst(fs->tx_port,
						fs->tx_queue,
						&pkts_burst[nb_tx],
						nb_replies - nb_tx);
			}
		}
		fs->tx_packets += nb_tx;
#ifdef RTE_TEST_PMD_RECORD_BURST_STATS
		fs->tx_burst_stats.pkt_burst_spread[nb_tx]++;
#endif
		if (unlikely(nb_tx < nb_replies)) {
			fs->fwd_dropped += (nb_replies - nb_tx);
			do {
				rte_pktmbuf_free(pkts_burst[nb_tx]);
			} while (++nb_tx < nb_replies);
		}
	}

#ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
	end_tsc = rte_rdtsc();
	core_cycles = (end_tsc - start_tsc);
	fs->core_cycles = (uint64_t) (fs->core_cycles + core_cycles);
#endif
}

struct fwd_engine icmp_echo_engine = {
	.fwd_mode_name  = "icmpecho",
	.port_fwd_begin = NULL,
	.port_fwd_end   = NULL,
	.packet_fwd     = reply_to_icmp_echo_rqsts,
};