1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2015 Intel Corporation
7 #include <rte_hash_crc.h>
8 #include <rte_byteorder.h>
17 get_psd_sum(void *l3_hdr, uint16_t ethertype, uint64_t ol_flags)
19 if (ethertype == RTE_ETHER_TYPE_IPv4)
20 return rte_ipv4_phdr_cksum(l3_hdr, ol_flags);
21 else /* assume ethertype == RTE_ETHER_TYPE_IPv6 */
22 return rte_ipv6_phdr_cksum(l3_hdr, ol_flags);
26 * Parse an ethernet header to fill the ethertype, outer_l2_len, outer_l3_len and
27 * ipproto. This function is able to recognize IPv4/IPv6 with one optional vlan
31 parse_ethernet(struct rte_ether_hdr *eth_hdr, union tunnel_offload_info *info,
34 struct ipv4_hdr *ipv4_hdr;
35 struct ipv6_hdr *ipv6_hdr;
38 info->outer_l2_len = sizeof(struct rte_ether_hdr);
39 ethertype = rte_be_to_cpu_16(eth_hdr->ether_type);
41 if (ethertype == RTE_ETHER_TYPE_VLAN) {
42 struct rte_vlan_hdr *vlan_hdr =
43 (struct rte_vlan_hdr *)(eth_hdr + 1);
44 info->outer_l2_len += sizeof(struct rte_vlan_hdr);
45 ethertype = rte_be_to_cpu_16(vlan_hdr->eth_proto);
49 case RTE_ETHER_TYPE_IPv4:
50 ipv4_hdr = (struct ipv4_hdr *)
51 ((char *)eth_hdr + info->outer_l2_len);
52 info->outer_l3_len = sizeof(struct ipv4_hdr);
53 *l4_proto = ipv4_hdr->next_proto_id;
55 case RTE_ETHER_TYPE_IPv6:
56 ipv6_hdr = (struct ipv6_hdr *)
57 ((char *)eth_hdr + info->outer_l2_len);
58 info->outer_l3_len = sizeof(struct ipv6_hdr);
59 *l4_proto = ipv6_hdr->proto;
62 info->outer_l3_len = 0;
69 * Calculate the checksum of a packet in hardware
72 process_inner_cksums(struct rte_ether_hdr *eth_hdr,
73 union tunnel_offload_info *info)
78 struct ipv4_hdr *ipv4_hdr;
79 struct ipv6_hdr *ipv6_hdr;
80 struct udp_hdr *udp_hdr;
81 struct tcp_hdr *tcp_hdr;
82 struct sctp_hdr *sctp_hdr;
83 uint64_t ol_flags = 0;
85 info->l2_len = sizeof(struct rte_ether_hdr);
86 ethertype = rte_be_to_cpu_16(eth_hdr->ether_type);
88 if (ethertype == RTE_ETHER_TYPE_VLAN) {
89 struct rte_vlan_hdr *vlan_hdr =
90 (struct rte_vlan_hdr *)(eth_hdr + 1);
91 info->l2_len += sizeof(struct rte_vlan_hdr);
92 ethertype = rte_be_to_cpu_16(vlan_hdr->eth_proto);
95 l3_hdr = (char *)eth_hdr + info->l2_len;
97 if (ethertype == RTE_ETHER_TYPE_IPv4) {
98 ipv4_hdr = (struct ipv4_hdr *)l3_hdr;
99 ipv4_hdr->hdr_checksum = 0;
100 ol_flags |= PKT_TX_IPV4;
101 ol_flags |= PKT_TX_IP_CKSUM;
102 info->l3_len = sizeof(struct ipv4_hdr);
103 l4_proto = ipv4_hdr->next_proto_id;
104 } else if (ethertype == RTE_ETHER_TYPE_IPv6) {
105 ipv6_hdr = (struct ipv6_hdr *)l3_hdr;
106 info->l3_len = sizeof(struct ipv6_hdr);
107 l4_proto = ipv6_hdr->proto;
108 ol_flags |= PKT_TX_IPV6;
110 return 0; /* packet type not supported, nothing to do */
112 if (l4_proto == IPPROTO_UDP) {
113 udp_hdr = (struct udp_hdr *)((char *)l3_hdr + info->l3_len);
114 ol_flags |= PKT_TX_UDP_CKSUM;
115 udp_hdr->dgram_cksum = get_psd_sum(l3_hdr,
116 ethertype, ol_flags);
117 } else if (l4_proto == IPPROTO_TCP) {
118 tcp_hdr = (struct tcp_hdr *)((char *)l3_hdr + info->l3_len);
119 /* Put PKT_TX_TCP_SEG bit setting before get_psd_sum(), because
120 * it depends on PKT_TX_TCP_SEG to calculate pseudo-header
123 if (tso_segsz != 0) {
124 ol_flags |= PKT_TX_TCP_SEG;
125 info->tso_segsz = tso_segsz;
126 info->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
128 ol_flags |= PKT_TX_TCP_CKSUM;
129 tcp_hdr->cksum = get_psd_sum(l3_hdr, ethertype, ol_flags);
131 } else if (l4_proto == IPPROTO_SCTP) {
132 sctp_hdr = (struct sctp_hdr *)((char *)l3_hdr + info->l3_len);
134 ol_flags |= PKT_TX_SCTP_CKSUM;
141 decapsulation(struct rte_mbuf *pkt)
143 uint8_t l4_proto = 0;
144 uint16_t outer_header_len;
145 struct udp_hdr *udp_hdr;
146 union tunnel_offload_info info = { .data = 0 };
147 struct rte_ether_hdr *phdr =
148 rte_pktmbuf_mtod(pkt, struct rte_ether_hdr *);
150 parse_ethernet(phdr, &info, &l4_proto);
152 if (l4_proto != IPPROTO_UDP)
155 udp_hdr = (struct udp_hdr *)((char *)phdr +
156 info.outer_l2_len + info.outer_l3_len);
158 /** check udp destination port, 4789 is the default vxlan port
159 * (rfc7348) or that the rx offload flag is set (i40e only
161 if (udp_hdr->dst_port != rte_cpu_to_be_16(DEFAULT_VXLAN_PORT) &&
162 (pkt->packet_type & RTE_PTYPE_TUNNEL_MASK) == 0)
164 outer_header_len = info.outer_l2_len + info.outer_l3_len
165 + sizeof(struct udp_hdr) + sizeof(struct rte_vxlan_hdr);
167 rte_pktmbuf_adj(pkt, outer_header_len);
173 encapsulation(struct rte_mbuf *m, uint8_t queue_id)
176 uint64_t ol_flags = 0;
177 uint32_t old_len = m->pkt_len, hash;
178 union tunnel_offload_info tx_offload = { .data = 0 };
179 struct rte_ether_hdr *phdr =
180 rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
182 /*Allocate space for new ethernet, IPv4, UDP and VXLAN headers*/
183 struct rte_ether_hdr *pneth =
184 (struct rte_ether_hdr *) rte_pktmbuf_prepend(m,
185 sizeof(struct rte_ether_hdr) + sizeof(struct ipv4_hdr)
186 + sizeof(struct udp_hdr) + sizeof(struct rte_vxlan_hdr));
188 struct ipv4_hdr *ip = (struct ipv4_hdr *) &pneth[1];
189 struct udp_hdr *udp = (struct udp_hdr *) &ip[1];
190 struct rte_vxlan_hdr *vxlan = (struct rte_vxlan_hdr *) &udp[1];
192 /* convert TX queue ID to vport ID */
193 vport_id = queue_id - 1;
195 /* replace original Ethernet header with ours */
196 pneth = rte_memcpy(pneth, &app_l2_hdr[vport_id],
197 sizeof(struct rte_ether_hdr));
199 /* copy in IP header */
200 ip = rte_memcpy(ip, &app_ip_hdr[vport_id],
201 sizeof(struct ipv4_hdr));
202 ip->total_length = rte_cpu_to_be_16(m->pkt_len
203 - sizeof(struct rte_ether_hdr));
205 /* outer IP checksum */
206 ol_flags |= PKT_TX_OUTER_IP_CKSUM;
207 ip->hdr_checksum = 0;
209 /* inner IP checksum offload */
211 ol_flags |= process_inner_cksums(phdr, &tx_offload);
212 m->l2_len = tx_offload.l2_len;
213 m->l3_len = tx_offload.l3_len;
214 m->l4_len = tx_offload.l4_len;
215 m->l2_len += RTE_ETHER_VXLAN_HLEN;
218 m->outer_l2_len = sizeof(struct rte_ether_hdr);
219 m->outer_l3_len = sizeof(struct ipv4_hdr);
221 ol_flags |= PKT_TX_TUNNEL_VXLAN;
223 m->ol_flags |= ol_flags;
224 m->tso_segsz = tx_offload.tso_segsz;
227 vxlan->vx_flags = rte_cpu_to_be_32(VXLAN_HF_VNI);
228 vxlan->vx_vni = rte_cpu_to_be_32(vxdev.out_key << 8);
231 udp->dgram_cksum = 0;
232 udp->dgram_len = rte_cpu_to_be_16(old_len
233 + sizeof(struct udp_hdr)
234 + sizeof(struct rte_vxlan_hdr));
236 udp->dst_port = rte_cpu_to_be_16(vxdev.dst_port);
237 hash = rte_hash_crc(phdr, 2 * RTE_ETHER_ADDR_LEN, phdr->ether_type);
238 udp->src_port = rte_cpu_to_be_16((((uint64_t) hash * PORT_RANGE) >> 32)