4 * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
5 * Copyright 2014 6WIND S.A.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * * Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * * Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
18 * * Neither the name of Intel Corporation nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
25 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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32 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42 #include <sys/queue.h>
45 #include <rte_common.h>
46 #include <rte_byteorder.h>
48 #include <rte_debug.h>
49 #include <rte_cycles.h>
50 #include <rte_memory.h>
51 #include <rte_memcpy.h>
52 #include <rte_memzone.h>
53 #include <rte_launch.h>
54 #include <rte_tailq.h>
56 #include <rte_per_lcore.h>
57 #include <rte_lcore.h>
58 #include <rte_atomic.h>
59 #include <rte_branch_prediction.h>
61 #include <rte_memory.h>
62 #include <rte_mempool.h>
64 #include <rte_memcpy.h>
65 #include <rte_interrupts.h>
67 #include <rte_ether.h>
68 #include <rte_ethdev.h>
73 #include <rte_prefetch.h>
74 #include <rte_string_fns.h>
77 #define IP_DEFTTL 64 /* from RFC 1340. */
78 #define IP_VERSION 0x40
79 #define IP_HDRLEN 0x05 /* default IP header length == five 32-bits words. */
80 #define IP_VHL_DEF (IP_VERSION | IP_HDRLEN)
82 /* We cannot use rte_cpu_to_be_16() on a constant in a switch/case */
83 #if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
84 #define _htons(x) ((uint16_t)((((x) & 0x00ffU) << 8) | (((x) & 0xff00U) >> 8)))
89 /* structure that caches offload info for the current packet */
90 struct testpmd_offload_info {
97 uint16_t outer_ethertype;
98 uint16_t outer_l2_len;
99 uint16_t outer_l3_len;
100 uint8_t outer_l4_proto;
104 /* simplified GRE header (flags must be 0) */
105 struct simple_gre_hdr {
111 get_psd_sum(void *l3_hdr, uint16_t ethertype, uint64_t ol_flags)
113 if (ethertype == _htons(ETHER_TYPE_IPv4))
114 return rte_ipv4_phdr_cksum(l3_hdr, ol_flags);
115 else /* assume ethertype == ETHER_TYPE_IPv6 */
116 return rte_ipv6_phdr_cksum(l3_hdr, ol_flags);
120 get_udptcp_checksum(void *l3_hdr, void *l4_hdr, uint16_t ethertype)
122 if (ethertype == _htons(ETHER_TYPE_IPv4))
123 return rte_ipv4_udptcp_cksum(l3_hdr, l4_hdr);
124 else /* assume ethertype == ETHER_TYPE_IPv6 */
125 return rte_ipv6_udptcp_cksum(l3_hdr, l4_hdr);
128 /* Parse an IPv4 header to fill l3_len, l4_len, and l4_proto */
130 parse_ipv4(struct ipv4_hdr *ipv4_hdr, struct testpmd_offload_info *info)
132 struct tcp_hdr *tcp_hdr;
134 info->l3_len = (ipv4_hdr->version_ihl & 0x0f) * 4;
135 info->l4_proto = ipv4_hdr->next_proto_id;
137 /* only fill l4_len for TCP, it's useful for TSO */
138 if (info->l4_proto == IPPROTO_TCP) {
139 tcp_hdr = (struct tcp_hdr *)((char *)ipv4_hdr + info->l3_len);
140 info->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
145 /* Parse an IPv6 header to fill l3_len, l4_len, and l4_proto */
147 parse_ipv6(struct ipv6_hdr *ipv6_hdr, struct testpmd_offload_info *info)
149 struct tcp_hdr *tcp_hdr;
151 info->l3_len = sizeof(struct ipv6_hdr);
152 info->l4_proto = ipv6_hdr->proto;
154 /* only fill l4_len for TCP, it's useful for TSO */
155 if (info->l4_proto == IPPROTO_TCP) {
156 tcp_hdr = (struct tcp_hdr *)((char *)ipv6_hdr + info->l3_len);
157 info->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
163 * Parse an ethernet header to fill the ethertype, l2_len, l3_len and
164 * ipproto. This function is able to recognize IPv4/IPv6 with one optional vlan
165 * header. The l4_len argument is only set in case of TCP (useful for TSO).
168 parse_ethernet(struct ether_hdr *eth_hdr, struct testpmd_offload_info *info)
170 struct ipv4_hdr *ipv4_hdr;
171 struct ipv6_hdr *ipv6_hdr;
173 info->l2_len = sizeof(struct ether_hdr);
174 info->ethertype = eth_hdr->ether_type;
176 if (info->ethertype == _htons(ETHER_TYPE_VLAN)) {
177 struct vlan_hdr *vlan_hdr = (struct vlan_hdr *)(eth_hdr + 1);
179 info->l2_len += sizeof(struct vlan_hdr);
180 info->ethertype = vlan_hdr->eth_proto;
183 switch (info->ethertype) {
184 case _htons(ETHER_TYPE_IPv4):
185 ipv4_hdr = (struct ipv4_hdr *) ((char *)eth_hdr + info->l2_len);
186 parse_ipv4(ipv4_hdr, info);
188 case _htons(ETHER_TYPE_IPv6):
189 ipv6_hdr = (struct ipv6_hdr *) ((char *)eth_hdr + info->l2_len);
190 parse_ipv6(ipv6_hdr, info);
200 /* Parse a vxlan header */
202 parse_vxlan(struct udp_hdr *udp_hdr, struct testpmd_offload_info *info,
203 uint64_t mbuf_olflags)
205 struct ether_hdr *eth_hdr;
207 /* check udp destination port, 4789 is the default vxlan port
208 * (rfc7348) or that the rx offload flag is set (i40e only
210 if (udp_hdr->dst_port != _htons(4789) &&
211 (mbuf_olflags & (PKT_RX_TUNNEL_IPV4_HDR |
212 PKT_RX_TUNNEL_IPV6_HDR)) == 0)
216 info->outer_ethertype = info->ethertype;
217 info->outer_l2_len = info->l2_len;
218 info->outer_l3_len = info->l3_len;
219 info->outer_l4_proto = info->l4_proto;
221 eth_hdr = (struct ether_hdr *)((char *)udp_hdr +
222 sizeof(struct udp_hdr) +
223 sizeof(struct vxlan_hdr));
225 parse_ethernet(eth_hdr, info);
226 info->l2_len += ETHER_VXLAN_HLEN; /* add udp + vxlan */
229 /* Parse a gre header */
231 parse_gre(struct simple_gre_hdr *gre_hdr, struct testpmd_offload_info *info)
233 struct ether_hdr *eth_hdr;
234 struct ipv4_hdr *ipv4_hdr;
235 struct ipv6_hdr *ipv6_hdr;
237 /* if flags != 0; it's not supported */
238 if (gre_hdr->flags != 0)
241 if (gre_hdr->proto == _htons(ETHER_TYPE_IPv4)) {
243 info->outer_ethertype = info->ethertype;
244 info->outer_l2_len = info->l2_len;
245 info->outer_l3_len = info->l3_len;
246 info->outer_l4_proto = info->l4_proto;
248 ipv4_hdr = (struct ipv4_hdr *)((char *)gre_hdr +
249 sizeof(struct simple_gre_hdr));
251 parse_ipv4(ipv4_hdr, info);
252 info->ethertype = _htons(ETHER_TYPE_IPv4);
255 } else if (gre_hdr->proto == _htons(ETHER_TYPE_IPv6)) {
257 info->outer_ethertype = info->ethertype;
258 info->outer_l2_len = info->l2_len;
259 info->outer_l3_len = info->l3_len;
260 info->outer_l4_proto = info->l4_proto;
262 ipv6_hdr = (struct ipv6_hdr *)((char *)gre_hdr +
263 sizeof(struct simple_gre_hdr));
265 info->ethertype = _htons(ETHER_TYPE_IPv6);
266 parse_ipv6(ipv6_hdr, info);
269 } else if (gre_hdr->proto == _htons(0x6558)) { /* ETH_P_TEB in linux */
271 info->outer_ethertype = info->ethertype;
272 info->outer_l2_len = info->l2_len;
273 info->outer_l3_len = info->l3_len;
274 info->outer_l4_proto = info->l4_proto;
276 eth_hdr = (struct ether_hdr *)((char *)gre_hdr +
277 sizeof(struct simple_gre_hdr));
279 parse_ethernet(eth_hdr, info);
283 info->l2_len += sizeof(struct simple_gre_hdr);
286 /* modify the IPv4 or IPv4 source address of a packet */
288 change_ip_addresses(void *l3_hdr, uint16_t ethertype)
290 struct ipv4_hdr *ipv4_hdr = l3_hdr;
291 struct ipv6_hdr *ipv6_hdr = l3_hdr;
293 if (ethertype == _htons(ETHER_TYPE_IPv4)) {
295 rte_cpu_to_be_32(rte_be_to_cpu_32(ipv4_hdr->src_addr) + 1);
296 } else if (ethertype == _htons(ETHER_TYPE_IPv6)) {
297 ipv6_hdr->src_addr[15] = ipv6_hdr->src_addr[15] + 1;
301 /* if possible, calculate the checksum of a packet in hw or sw,
302 * depending on the testpmd command line configuration */
304 process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info,
305 uint16_t testpmd_ol_flags)
307 struct ipv4_hdr *ipv4_hdr = l3_hdr;
308 struct udp_hdr *udp_hdr;
309 struct tcp_hdr *tcp_hdr;
310 struct sctp_hdr *sctp_hdr;
311 uint64_t ol_flags = 0;
313 if (info->ethertype == _htons(ETHER_TYPE_IPv4)) {
315 ipv4_hdr->hdr_checksum = 0;
317 ol_flags |= PKT_TX_IPV4;
318 if (info->tso_segsz != 0 && info->l4_proto == IPPROTO_TCP) {
319 ol_flags |= PKT_TX_IP_CKSUM;
321 if (testpmd_ol_flags & TESTPMD_TX_OFFLOAD_IP_CKSUM)
322 ol_flags |= PKT_TX_IP_CKSUM;
324 ipv4_hdr->hdr_checksum =
325 rte_ipv4_cksum(ipv4_hdr);
327 } else if (info->ethertype == _htons(ETHER_TYPE_IPv6))
328 ol_flags |= PKT_TX_IPV6;
330 return 0; /* packet type not supported, nothing to do */
332 if (info->l4_proto == IPPROTO_UDP) {
333 udp_hdr = (struct udp_hdr *)((char *)l3_hdr + info->l3_len);
334 /* do not recalculate udp cksum if it was 0 */
335 if (udp_hdr->dgram_cksum != 0) {
336 udp_hdr->dgram_cksum = 0;
337 if (testpmd_ol_flags & TESTPMD_TX_OFFLOAD_UDP_CKSUM) {
338 ol_flags |= PKT_TX_UDP_CKSUM;
339 udp_hdr->dgram_cksum = get_psd_sum(l3_hdr,
340 info->ethertype, ol_flags);
342 udp_hdr->dgram_cksum =
343 get_udptcp_checksum(l3_hdr, udp_hdr,
347 } else if (info->l4_proto == IPPROTO_TCP) {
348 tcp_hdr = (struct tcp_hdr *)((char *)l3_hdr + info->l3_len);
350 if (info->tso_segsz != 0) {
351 ol_flags |= PKT_TX_TCP_SEG;
352 tcp_hdr->cksum = get_psd_sum(l3_hdr, info->ethertype,
354 } else if (testpmd_ol_flags & TESTPMD_TX_OFFLOAD_TCP_CKSUM) {
355 ol_flags |= PKT_TX_TCP_CKSUM;
356 tcp_hdr->cksum = get_psd_sum(l3_hdr, info->ethertype,
360 get_udptcp_checksum(l3_hdr, tcp_hdr,
363 } else if (info->l4_proto == IPPROTO_SCTP) {
364 sctp_hdr = (struct sctp_hdr *)((char *)l3_hdr + info->l3_len);
366 /* sctp payload must be a multiple of 4 to be
368 if ((testpmd_ol_flags & TESTPMD_TX_OFFLOAD_SCTP_CKSUM) &&
369 ((ipv4_hdr->total_length & 0x3) == 0)) {
370 ol_flags |= PKT_TX_SCTP_CKSUM;
372 /* XXX implement CRC32c, example available in
380 /* Calculate the checksum of outer header (only vxlan is supported,
381 * meaning IP + UDP). The caller already checked that it's a vxlan
384 process_outer_cksums(void *outer_l3_hdr, struct testpmd_offload_info *info,
385 uint16_t testpmd_ol_flags)
387 struct ipv4_hdr *ipv4_hdr = outer_l3_hdr;
388 struct ipv6_hdr *ipv6_hdr = outer_l3_hdr;
389 struct udp_hdr *udp_hdr;
390 uint64_t ol_flags = 0;
392 if (info->outer_ethertype == _htons(ETHER_TYPE_IPv4)) {
393 ipv4_hdr->hdr_checksum = 0;
394 ol_flags |= PKT_TX_OUTER_IPV4;
396 if (testpmd_ol_flags & TESTPMD_TX_OFFLOAD_OUTER_IP_CKSUM)
397 ol_flags |= PKT_TX_OUTER_IP_CKSUM;
399 ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr);
400 } else if (testpmd_ol_flags & TESTPMD_TX_OFFLOAD_OUTER_IP_CKSUM)
401 ol_flags |= PKT_TX_OUTER_IPV6;
403 if (info->outer_l4_proto != IPPROTO_UDP)
406 /* outer UDP checksum is always done in software as we have no
407 * hardware supporting it today, and no API for it. */
409 udp_hdr = (struct udp_hdr *)((char *)outer_l3_hdr + info->outer_l3_len);
410 /* do not recalculate udp cksum if it was 0 */
411 if (udp_hdr->dgram_cksum != 0) {
412 udp_hdr->dgram_cksum = 0;
413 if (info->outer_ethertype == _htons(ETHER_TYPE_IPv4))
414 udp_hdr->dgram_cksum =
415 rte_ipv4_udptcp_cksum(ipv4_hdr, udp_hdr);
417 udp_hdr->dgram_cksum =
418 rte_ipv6_udptcp_cksum(ipv6_hdr, udp_hdr);
425 * Receive a burst of packets, and for each packet:
426 * - parse packet, and try to recognize a supported packet type (1)
427 * - if it's not a supported packet type, don't touch the packet, else:
428 * - modify the IPs in inner headers and in outer headers if any
429 * - reprocess the checksum of all supported layers. This is done in SW
430 * or HW, depending on testpmd command line configuration
431 * - if TSO is enabled in testpmd command line, also flag the mbuf for TCP
432 * segmentation offload (this implies HW TCP checksum)
433 * Then transmit packets on the output port.
435 * (1) Supported packets are:
436 * Ether / (vlan) / IP|IP6 / UDP|TCP|SCTP .
437 * Ether / (vlan) / outer IP|IP6 / outer UDP / VxLAN / Ether / IP|IP6 /
439 * Ether / (vlan) / outer IP|IP6 / GRE / Ether / IP|IP6 / UDP|TCP|SCTP
440 * Ether / (vlan) / outer IP|IP6 / GRE / IP|IP6 / UDP|TCP|SCTP
442 * The testpmd command line for this forward engine sets the flags
443 * TESTPMD_TX_OFFLOAD_* in ports[tx_port].tx_ol_flags. They control
444 * wether a checksum must be calculated in software or in hardware. The
445 * IP, UDP, TCP and SCTP flags always concern the inner layer. The
446 * OUTER_IP is only useful for tunnel packets.
449 pkt_burst_checksum_forward(struct fwd_stream *fs)
451 struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
452 struct rte_port *txp;
454 struct ether_hdr *eth_hdr;
455 void *l3_hdr = NULL, *outer_l3_hdr = NULL; /* can be IPv4 or IPv6 */
460 uint16_t testpmd_ol_flags;
461 uint32_t rx_bad_ip_csum;
462 uint32_t rx_bad_l4_csum;
463 struct testpmd_offload_info info;
465 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
468 uint64_t core_cycles;
471 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
472 start_tsc = rte_rdtsc();
475 /* receive a burst of packet */
476 nb_rx = rte_eth_rx_burst(fs->rx_port, fs->rx_queue, pkts_burst,
478 if (unlikely(nb_rx == 0))
481 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
482 fs->rx_burst_stats.pkt_burst_spread[nb_rx]++;
484 fs->rx_packets += nb_rx;
488 txp = &ports[fs->tx_port];
489 testpmd_ol_flags = txp->tx_ol_flags;
490 memset(&info, 0, sizeof(info));
491 info.tso_segsz = txp->tso_segsz;
493 for (i = 0; i < nb_rx; i++) {
499 /* Update the L3/L4 checksum error packet statistics */
500 rx_bad_ip_csum += ((m->ol_flags & PKT_RX_IP_CKSUM_BAD) != 0);
501 rx_bad_l4_csum += ((m->ol_flags & PKT_RX_L4_CKSUM_BAD) != 0);
503 /* step 1: dissect packet, parsing optional vlan, ip4/ip6, vxlan
504 * and inner headers */
506 eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);
507 parse_ethernet(eth_hdr, &info);
508 l3_hdr = (char *)eth_hdr + info.l2_len;
510 /* check if it's a supported tunnel */
511 if (testpmd_ol_flags & TESTPMD_TX_OFFLOAD_PARSE_TUNNEL) {
512 if (info.l4_proto == IPPROTO_UDP) {
513 struct udp_hdr *udp_hdr;
514 udp_hdr = (struct udp_hdr *)((char *)l3_hdr +
516 parse_vxlan(udp_hdr, &info, m->ol_flags);
517 } else if (info.l4_proto == IPPROTO_GRE) {
518 struct simple_gre_hdr *gre_hdr;
519 gre_hdr = (struct simple_gre_hdr *)
520 ((char *)l3_hdr + info.l3_len);
521 parse_gre(gre_hdr, &info);
525 /* update l3_hdr and outer_l3_hdr if a tunnel was parsed */
526 if (info.is_tunnel) {
527 outer_l3_hdr = l3_hdr;
528 l3_hdr = (char *)l3_hdr + info.outer_l3_len + info.l2_len;
531 /* step 2: change all source IPs (v4 or v6) so we need
532 * to recompute the chksums even if they were correct */
534 change_ip_addresses(l3_hdr, info.ethertype);
535 if (info.is_tunnel == 1)
536 change_ip_addresses(outer_l3_hdr, info.outer_ethertype);
538 /* step 3: depending on user command line configuration,
539 * recompute checksum either in software or flag the
540 * mbuf to offload the calculation to the NIC. If TSO
541 * is configured, prepare the mbuf for TCP segmentation. */
543 /* process checksums of inner headers first */
544 ol_flags |= process_inner_cksums(l3_hdr, &info, testpmd_ol_flags);
546 /* Then process outer headers if any. Note that the software
547 * checksum will be wrong if one of the inner checksums is
548 * processed in hardware. */
549 if (info.is_tunnel == 1) {
550 ol_flags |= process_outer_cksums(outer_l3_hdr, &info,
554 /* step 4: fill the mbuf meta data (flags and header lengths) */
556 if (info.is_tunnel == 1) {
557 if (testpmd_ol_flags & TESTPMD_TX_OFFLOAD_OUTER_IP_CKSUM) {
558 m->outer_l2_len = info.outer_l2_len;
559 m->outer_l3_len = info.outer_l3_len;
560 m->l2_len = info.l2_len;
561 m->l3_len = info.l3_len;
564 /* if there is a outer UDP cksum
565 processed in sw and the inner in hw,
566 the outer checksum will be wrong as
567 the payload will be modified by the
569 m->l2_len = info.outer_l2_len +
570 info.outer_l3_len + info.l2_len;
571 m->l3_len = info.l3_len;
572 m->l4_len = info.l4_len;
575 /* this is only useful if an offload flag is
576 * set, but it does not hurt to fill it in any
578 m->l2_len = info.l2_len;
579 m->l3_len = info.l3_len;
580 m->l4_len = info.l4_len;
582 m->tso_segsz = info.tso_segsz;
583 m->ol_flags = ol_flags;
585 /* if verbose mode is enabled, dump debug info */
586 if (verbose_level > 0) {
591 { PKT_TX_IP_CKSUM, PKT_TX_IP_CKSUM },
592 { PKT_TX_UDP_CKSUM, PKT_TX_L4_MASK },
593 { PKT_TX_TCP_CKSUM, PKT_TX_L4_MASK },
594 { PKT_TX_SCTP_CKSUM, PKT_TX_L4_MASK },
595 { PKT_TX_IPV4, PKT_TX_IPV4 },
596 { PKT_TX_IPV6, PKT_TX_IPV6 },
597 { PKT_TX_OUTER_IP_CKSUM, PKT_TX_OUTER_IP_CKSUM },
598 { PKT_TX_OUTER_IPV4, PKT_TX_OUTER_IPV4 },
599 { PKT_TX_OUTER_IPV6, PKT_TX_OUTER_IPV6 },
600 { PKT_TX_TCP_SEG, PKT_TX_TCP_SEG },
605 printf("-----------------\n");
606 /* dump rx parsed packet info */
607 printf("rx: l2_len=%d ethertype=%x l3_len=%d "
608 "l4_proto=%d l4_len=%d\n",
609 info.l2_len, rte_be_to_cpu_16(info.ethertype),
610 info.l3_len, info.l4_proto, info.l4_len);
611 if (info.is_tunnel == 1)
612 printf("rx: outer_l2_len=%d outer_ethertype=%x "
613 "outer_l3_len=%d\n", info.outer_l2_len,
614 rte_be_to_cpu_16(info.outer_ethertype),
616 /* dump tx packet info */
617 if ((testpmd_ol_flags & (TESTPMD_TX_OFFLOAD_IP_CKSUM |
618 TESTPMD_TX_OFFLOAD_UDP_CKSUM |
619 TESTPMD_TX_OFFLOAD_TCP_CKSUM |
620 TESTPMD_TX_OFFLOAD_SCTP_CKSUM)) ||
622 printf("tx: m->l2_len=%d m->l3_len=%d "
624 m->l2_len, m->l3_len, m->l4_len);
625 if ((info.is_tunnel == 1) &&
626 (testpmd_ol_flags & TESTPMD_TX_OFFLOAD_OUTER_IP_CKSUM))
627 printf("tx: m->outer_l2_len=%d m->outer_l3_len=%d\n",
628 m->outer_l2_len, m->outer_l3_len);
629 if (info.tso_segsz != 0)
630 printf("tx: m->tso_segsz=%d\n", m->tso_segsz);
631 printf("tx: flags=");
632 for (j = 0; j < sizeof(tx_flags)/sizeof(*tx_flags); j++) {
633 name = rte_get_tx_ol_flag_name(tx_flags[j].flag);
634 if ((m->ol_flags & tx_flags[j].mask) ==
641 nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue, pkts_burst, nb_rx);
642 fs->tx_packets += nb_tx;
643 fs->rx_bad_ip_csum += rx_bad_ip_csum;
644 fs->rx_bad_l4_csum += rx_bad_l4_csum;
646 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
647 fs->tx_burst_stats.pkt_burst_spread[nb_tx]++;
649 if (unlikely(nb_tx < nb_rx)) {
650 fs->fwd_dropped += (nb_rx - nb_tx);
652 rte_pktmbuf_free(pkts_burst[nb_tx]);
653 } while (++nb_tx < nb_rx);
655 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
656 end_tsc = rte_rdtsc();
657 core_cycles = (end_tsc - start_tsc);
658 fs->core_cycles = (uint64_t) (fs->core_cycles + core_cycles);
662 struct fwd_engine csum_fwd_engine = {
663 .fwd_mode_name = "csum",
664 .port_fwd_begin = NULL,
665 .port_fwd_end = NULL,
666 .packet_fwd = pkt_burst_checksum_forward,