4 * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
5 * Copyright 2014 6WIND S.A.
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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 htons() from arpa/inet.h due to name conflicts, and we
83 * cannot use rte_cpu_to_be_16() on a constant in a switch/case */
84 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
85 #define _htons(x) ((uint16_t)((((x) & 0x00ffU) << 8) | (((x) & 0xff00U) >> 8)))
91 get_psd_sum(void *l3_hdr, uint16_t ethertype, uint64_t ol_flags)
93 if (ethertype == _htons(ETHER_TYPE_IPv4))
94 return rte_ipv4_phdr_cksum(l3_hdr, ol_flags);
95 else /* assume ethertype == ETHER_TYPE_IPv6 */
96 return rte_ipv6_phdr_cksum(l3_hdr, ol_flags);
100 get_udptcp_checksum(void *l3_hdr, void *l4_hdr, uint16_t ethertype)
102 if (ethertype == _htons(ETHER_TYPE_IPv4))
103 return rte_ipv4_udptcp_cksum(l3_hdr, l4_hdr);
104 else /* assume ethertype == ETHER_TYPE_IPv6 */
105 return rte_ipv6_udptcp_cksum(l3_hdr, l4_hdr);
109 * Parse an ethernet header to fill the ethertype, l2_len, l3_len and
110 * ipproto. This function is able to recognize IPv4/IPv6 with one optional vlan
111 * header. The l4_len argument is only set in case of TCP (useful for TSO).
114 parse_ethernet(struct ether_hdr *eth_hdr, uint16_t *ethertype, uint16_t *l2_len,
115 uint16_t *l3_len, uint8_t *l4_proto, uint16_t *l4_len)
117 struct ipv4_hdr *ipv4_hdr;
118 struct ipv6_hdr *ipv6_hdr;
119 struct tcp_hdr *tcp_hdr;
121 *l2_len = sizeof(struct ether_hdr);
122 *ethertype = eth_hdr->ether_type;
124 if (*ethertype == _htons(ETHER_TYPE_VLAN)) {
125 struct vlan_hdr *vlan_hdr = (struct vlan_hdr *)(eth_hdr + 1);
127 *l2_len += sizeof(struct vlan_hdr);
128 *ethertype = vlan_hdr->eth_proto;
131 switch (*ethertype) {
132 case _htons(ETHER_TYPE_IPv4):
133 ipv4_hdr = (struct ipv4_hdr *) ((char *)eth_hdr + *l2_len);
134 *l3_len = (ipv4_hdr->version_ihl & 0x0f) * 4;
135 *l4_proto = ipv4_hdr->next_proto_id;
137 case _htons(ETHER_TYPE_IPv6):
138 ipv6_hdr = (struct ipv6_hdr *) ((char *)eth_hdr + *l2_len);
139 *l3_len = sizeof(struct ipv6_hdr);
140 *l4_proto = ipv6_hdr->proto;
148 if (*l4_proto == IPPROTO_TCP) {
149 tcp_hdr = (struct tcp_hdr *)((char *)eth_hdr +
151 *l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
156 /* modify the IPv4 or IPv4 source address of a packet */
158 change_ip_addresses(void *l3_hdr, uint16_t ethertype)
160 struct ipv4_hdr *ipv4_hdr = l3_hdr;
161 struct ipv6_hdr *ipv6_hdr = l3_hdr;
163 if (ethertype == _htons(ETHER_TYPE_IPv4)) {
165 rte_cpu_to_be_32(rte_be_to_cpu_32(ipv4_hdr->src_addr) + 1);
166 } else if (ethertype == _htons(ETHER_TYPE_IPv6)) {
167 ipv6_hdr->src_addr[15] = ipv6_hdr->src_addr[15] + 1;
171 /* if possible, calculate the checksum of a packet in hw or sw,
172 * depending on the testpmd command line configuration */
174 process_inner_cksums(void *l3_hdr, uint16_t ethertype, uint16_t l3_len,
175 uint8_t l4_proto, uint16_t tso_segsz, uint16_t testpmd_ol_flags)
177 struct ipv4_hdr *ipv4_hdr = l3_hdr;
178 struct udp_hdr *udp_hdr;
179 struct tcp_hdr *tcp_hdr;
180 struct sctp_hdr *sctp_hdr;
181 uint64_t ol_flags = 0;
183 if (ethertype == _htons(ETHER_TYPE_IPv4)) {
185 ipv4_hdr->hdr_checksum = 0;
187 if (tso_segsz != 0 && l4_proto == IPPROTO_TCP) {
188 ol_flags |= PKT_TX_IP_CKSUM;
190 if (testpmd_ol_flags & TESTPMD_TX_OFFLOAD_IP_CKSUM)
191 ol_flags |= PKT_TX_IP_CKSUM;
193 ipv4_hdr->hdr_checksum =
194 rte_ipv4_cksum(ipv4_hdr);
196 ol_flags |= PKT_TX_IPV4;
197 } else if (ethertype == _htons(ETHER_TYPE_IPv6))
198 ol_flags |= PKT_TX_IPV6;
200 return 0; /* packet type not supported, nothing to do */
202 if (l4_proto == IPPROTO_UDP) {
203 udp_hdr = (struct udp_hdr *)((char *)l3_hdr + l3_len);
204 /* do not recalculate udp cksum if it was 0 */
205 if (udp_hdr->dgram_cksum != 0) {
206 udp_hdr->dgram_cksum = 0;
207 if (testpmd_ol_flags & TESTPMD_TX_OFFLOAD_UDP_CKSUM) {
208 ol_flags |= PKT_TX_UDP_CKSUM;
209 udp_hdr->dgram_cksum = get_psd_sum(l3_hdr,
210 ethertype, ol_flags);
212 udp_hdr->dgram_cksum =
213 get_udptcp_checksum(l3_hdr, udp_hdr,
217 } else if (l4_proto == IPPROTO_TCP) {
218 tcp_hdr = (struct tcp_hdr *)((char *)l3_hdr + l3_len);
220 if (tso_segsz != 0) {
221 ol_flags |= PKT_TX_TCP_SEG;
222 tcp_hdr->cksum = get_psd_sum(l3_hdr, ethertype, ol_flags);
223 } else if (testpmd_ol_flags & TESTPMD_TX_OFFLOAD_TCP_CKSUM) {
224 ol_flags |= PKT_TX_TCP_CKSUM;
225 tcp_hdr->cksum = get_psd_sum(l3_hdr, ethertype, ol_flags);
228 get_udptcp_checksum(l3_hdr, tcp_hdr, ethertype);
230 } else if (l4_proto == IPPROTO_SCTP) {
231 sctp_hdr = (struct sctp_hdr *)((char *)l3_hdr + l3_len);
233 /* sctp payload must be a multiple of 4 to be
235 if ((testpmd_ol_flags & TESTPMD_TX_OFFLOAD_SCTP_CKSUM) &&
236 ((ipv4_hdr->total_length & 0x3) == 0)) {
237 ol_flags |= PKT_TX_SCTP_CKSUM;
239 /* XXX implement CRC32c, example available in
247 /* Calculate the checksum of outer header (only vxlan is supported,
248 * meaning IP + UDP). The caller already checked that it's a vxlan
251 process_outer_cksums(void *outer_l3_hdr, uint16_t outer_ethertype,
252 uint16_t outer_l3_len, uint16_t testpmd_ol_flags)
254 struct ipv4_hdr *ipv4_hdr = outer_l3_hdr;
255 struct ipv6_hdr *ipv6_hdr = outer_l3_hdr;
256 struct udp_hdr *udp_hdr;
257 uint64_t ol_flags = 0;
259 if (testpmd_ol_flags & TESTPMD_TX_OFFLOAD_VXLAN_CKSUM)
260 ol_flags |= PKT_TX_VXLAN_CKSUM;
262 if (outer_ethertype == _htons(ETHER_TYPE_IPv4)) {
263 ipv4_hdr->hdr_checksum = 0;
265 if ((testpmd_ol_flags & TESTPMD_TX_OFFLOAD_VXLAN_CKSUM) == 0)
266 ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr);
269 udp_hdr = (struct udp_hdr *)((char *)outer_l3_hdr + outer_l3_len);
270 /* do not recalculate udp cksum if it was 0 */
271 if (udp_hdr->dgram_cksum != 0) {
272 udp_hdr->dgram_cksum = 0;
273 if ((testpmd_ol_flags & TESTPMD_TX_OFFLOAD_VXLAN_CKSUM) == 0) {
274 if (outer_ethertype == _htons(ETHER_TYPE_IPv4))
275 udp_hdr->dgram_cksum =
276 rte_ipv4_udptcp_cksum(ipv4_hdr, udp_hdr);
278 udp_hdr->dgram_cksum =
279 rte_ipv6_udptcp_cksum(ipv6_hdr, udp_hdr);
287 * Receive a burst of packets, and for each packet:
288 * - parse packet, and try to recognize a supported packet type (1)
289 * - if it's not a supported packet type, don't touch the packet, else:
290 * - modify the IPs in inner headers and in outer headers if any
291 * - reprocess the checksum of all supported layers. This is done in SW
292 * or HW, depending on testpmd command line configuration
293 * - if TSO is enabled in testpmd command line, also flag the mbuf for TCP
294 * segmentation offload (this implies HW TCP checksum)
295 * Then transmit packets on the output port.
297 * (1) Supported packets are:
298 * Ether / (vlan) / IP|IP6 / UDP|TCP|SCTP .
299 * Ether / (vlan) / outer IP|IP6 / outer UDP / VxLAN / Ether / IP|IP6 /
302 * The testpmd command line for this forward engine sets the flags
303 * TESTPMD_TX_OFFLOAD_* in ports[tx_port].tx_ol_flags. They control
304 * wether a checksum must be calculated in software or in hardware. The
305 * IP, UDP, TCP and SCTP flags always concern the inner layer. The
306 * VxLAN flag concerns the outer IP and UDP layer (if packet is
307 * recognized as a vxlan packet).
310 pkt_burst_checksum_forward(struct fwd_stream *fs)
312 struct rte_mbuf *pkts_burst[MAX_PKT_BURST];
313 struct rte_port *txp;
315 struct ether_hdr *eth_hdr;
316 void *l3_hdr = NULL, *outer_l3_hdr = NULL; /* can be IPv4 or IPv6 */
317 struct udp_hdr *udp_hdr;
322 uint16_t testpmd_ol_flags;
324 uint16_t ethertype = 0, outer_ethertype = 0;
325 uint16_t l2_len = 0, l3_len = 0, l4_len = 0;
326 uint16_t outer_l2_len = 0, outer_l3_len = 0;
329 uint32_t rx_bad_ip_csum;
330 uint32_t rx_bad_l4_csum;
332 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
335 uint64_t core_cycles;
338 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
339 start_tsc = rte_rdtsc();
342 /* receive a burst of packet */
343 nb_rx = rte_eth_rx_burst(fs->rx_port, fs->rx_queue, pkts_burst,
345 if (unlikely(nb_rx == 0))
348 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
349 fs->rx_burst_stats.pkt_burst_spread[nb_rx]++;
351 fs->rx_packets += nb_rx;
355 txp = &ports[fs->tx_port];
356 testpmd_ol_flags = txp->tx_ol_flags;
357 tso_segsz = txp->tso_segsz;
359 for (i = 0; i < nb_rx; i++) {
365 /* Update the L3/L4 checksum error packet statistics */
366 rx_bad_ip_csum += ((m->ol_flags & PKT_RX_IP_CKSUM_BAD) != 0);
367 rx_bad_l4_csum += ((m->ol_flags & PKT_RX_L4_CKSUM_BAD) != 0);
369 /* step 1: dissect packet, parsing optional vlan, ip4/ip6, vxlan
370 * and inner headers */
372 eth_hdr = rte_pktmbuf_mtod(m, struct ether_hdr *);
373 parse_ethernet(eth_hdr, ðertype, &l2_len, &l3_len,
375 l3_hdr = (char *)eth_hdr + l2_len;
377 /* check if it's a supported tunnel (only vxlan for now) */
378 if (l4_proto == IPPROTO_UDP) {
379 udp_hdr = (struct udp_hdr *)((char *)l3_hdr + l3_len);
381 /* currently, this flag is set by i40e only if the
383 if (((m->ol_flags & PKT_RX_TUNNEL_IPV4_HDR) ||
384 (m->ol_flags & PKT_RX_TUNNEL_IPV6_HDR)))
386 /* else check udp destination port, 4789 is the default
387 * vxlan port (rfc7348) */
388 else if (udp_hdr->dst_port == _htons(4789))
392 outer_ethertype = ethertype;
393 outer_l2_len = l2_len;
394 outer_l3_len = l3_len;
395 outer_l3_hdr = l3_hdr;
397 eth_hdr = (struct ether_hdr *)((char *)udp_hdr +
398 sizeof(struct udp_hdr) +
399 sizeof(struct vxlan_hdr));
401 parse_ethernet(eth_hdr, ðertype, &l2_len,
402 &l3_len, &l4_proto, &l4_len);
403 l3_hdr = (char *)eth_hdr + l2_len;
407 /* step 2: change all source IPs (v4 or v6) so we need
408 * to recompute the chksums even if they were correct */
410 change_ip_addresses(l3_hdr, ethertype);
412 change_ip_addresses(outer_l3_hdr, outer_ethertype);
414 /* step 3: depending on user command line configuration,
415 * recompute checksum either in software or flag the
416 * mbuf to offload the calculation to the NIC. If TSO
417 * is configured, prepare the mbuf for TCP segmentation. */
419 /* process checksums of inner headers first */
420 ol_flags |= process_inner_cksums(l3_hdr, ethertype,
421 l3_len, l4_proto, tso_segsz, testpmd_ol_flags);
423 /* Then process outer headers if any. Note that the software
424 * checksum will be wrong if one of the inner checksums is
425 * processed in hardware. */
427 ol_flags |= process_outer_cksums(outer_l3_hdr,
428 outer_ethertype, outer_l3_len, testpmd_ol_flags);
431 /* step 4: fill the mbuf meta data (flags and header lengths) */
434 if (testpmd_ol_flags & TESTPMD_TX_OFFLOAD_VXLAN_CKSUM) {
435 m->l2_len = outer_l2_len;
436 m->l3_len = outer_l3_len;
437 m->inner_l2_len = l2_len;
438 m->inner_l3_len = l3_len;
441 /* if we don't do vxlan cksum in hw,
442 outer checksum will be wrong because
443 we changed the ip, but it shows that
444 we can process the inner header cksum
446 m->l2_len = outer_l2_len + outer_l3_len +
447 sizeof(struct udp_hdr) +
448 sizeof(struct vxlan_hdr) + l2_len;
453 /* this is only useful if an offload flag is
454 * set, but it does not hurt to fill it in any
460 m->tso_segsz = tso_segsz;
461 m->ol_flags = ol_flags;
463 /* if verbose mode is enabled, dump debug info */
464 if (verbose_level > 0) {
469 { PKT_TX_IP_CKSUM, PKT_TX_IP_CKSUM },
470 { PKT_TX_UDP_CKSUM, PKT_TX_L4_MASK },
471 { PKT_TX_TCP_CKSUM, PKT_TX_L4_MASK },
472 { PKT_TX_SCTP_CKSUM, PKT_TX_L4_MASK },
473 { PKT_TX_VXLAN_CKSUM, PKT_TX_VXLAN_CKSUM },
474 { PKT_TX_TCP_SEG, PKT_TX_TCP_SEG },
479 printf("-----------------\n");
480 /* dump rx parsed packet info */
481 printf("rx: l2_len=%d ethertype=%x l3_len=%d "
482 "l4_proto=%d l4_len=%d\n",
483 l2_len, rte_be_to_cpu_16(ethertype),
484 l3_len, l4_proto, l4_len);
486 printf("rx: outer_l2_len=%d outer_ethertype=%x "
487 "outer_l3_len=%d\n", outer_l2_len,
488 rte_be_to_cpu_16(outer_ethertype),
490 /* dump tx packet info */
491 if ((testpmd_ol_flags & (TESTPMD_TX_OFFLOAD_IP_CKSUM |
492 TESTPMD_TX_OFFLOAD_UDP_CKSUM |
493 TESTPMD_TX_OFFLOAD_TCP_CKSUM |
494 TESTPMD_TX_OFFLOAD_SCTP_CKSUM)) ||
496 printf("tx: m->l2_len=%d m->l3_len=%d "
498 m->l2_len, m->l3_len, m->l4_len);
500 (testpmd_ol_flags & TESTPMD_TX_OFFLOAD_VXLAN_CKSUM))
501 printf("tx: m->inner_l2_len=%d m->inner_l3_len=%d\n",
502 m->inner_l2_len, m->inner_l3_len);
504 printf("tx: m->tso_segsz=%d\n", m->tso_segsz);
505 printf("tx: flags=");
506 for (j = 0; j < sizeof(tx_flags)/sizeof(*tx_flags); j++) {
507 name = rte_get_tx_ol_flag_name(tx_flags[j].flag);
508 if ((m->ol_flags & tx_flags[j].mask) ==
515 nb_tx = rte_eth_tx_burst(fs->tx_port, fs->tx_queue, pkts_burst, nb_rx);
516 fs->tx_packets += nb_tx;
517 fs->rx_bad_ip_csum += rx_bad_ip_csum;
518 fs->rx_bad_l4_csum += rx_bad_l4_csum;
520 #ifdef RTE_TEST_PMD_RECORD_BURST_STATS
521 fs->tx_burst_stats.pkt_burst_spread[nb_tx]++;
523 if (unlikely(nb_tx < nb_rx)) {
524 fs->fwd_dropped += (nb_rx - nb_tx);
526 rte_pktmbuf_free(pkts_burst[nb_tx]);
527 } while (++nb_tx < nb_rx);
529 #ifdef RTE_TEST_PMD_RECORD_CORE_CYCLES
530 end_tsc = rte_rdtsc();
531 core_cycles = (end_tsc - start_tsc);
532 fs->core_cycles = (uint64_t) (fs->core_cycles + core_cycles);
536 struct fwd_engine csum_fwd_engine = {
537 .fwd_mode_name = "csum",
538 .port_fwd_begin = NULL,
539 .port_fwd_end = NULL,
540 .packet_fwd = pkt_burst_checksum_forward,