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 == ETHER_TYPE_IPv4)
20 return rte_ipv4_phdr_cksum(l3_hdr, ol_flags);
21 else /* assume ethertype == 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 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 ether_hdr);
39 ethertype = rte_be_to_cpu_16(eth_hdr->ether_type);
41 if (ethertype == ETHER_TYPE_VLAN) {
42 struct vlan_hdr *vlan_hdr = (struct vlan_hdr *)(eth_hdr + 1);
43 info->outer_l2_len += sizeof(struct vlan_hdr);
44 ethertype = rte_be_to_cpu_16(vlan_hdr->eth_proto);
49 ipv4_hdr = (struct ipv4_hdr *)
50 ((char *)eth_hdr + info->outer_l2_len);
51 info->outer_l3_len = sizeof(struct ipv4_hdr);
52 *l4_proto = ipv4_hdr->next_proto_id;
55 ipv6_hdr = (struct ipv6_hdr *)
56 ((char *)eth_hdr + info->outer_l2_len);
57 info->outer_l3_len = sizeof(struct ipv6_hdr);
58 *l4_proto = ipv6_hdr->proto;
61 info->outer_l3_len = 0;
68 * Calculate the checksum of a packet in hardware
71 process_inner_cksums(struct ether_hdr *eth_hdr, union tunnel_offload_info *info)
76 struct ipv4_hdr *ipv4_hdr;
77 struct ipv6_hdr *ipv6_hdr;
78 struct udp_hdr *udp_hdr;
79 struct tcp_hdr *tcp_hdr;
80 struct sctp_hdr *sctp_hdr;
81 uint64_t ol_flags = 0;
83 info->l2_len = sizeof(struct ether_hdr);
84 ethertype = rte_be_to_cpu_16(eth_hdr->ether_type);
86 if (ethertype == ETHER_TYPE_VLAN) {
87 struct vlan_hdr *vlan_hdr = (struct vlan_hdr *)(eth_hdr + 1);
88 info->l2_len += sizeof(struct vlan_hdr);
89 ethertype = rte_be_to_cpu_16(vlan_hdr->eth_proto);
92 l3_hdr = (char *)eth_hdr + info->l2_len;
94 if (ethertype == ETHER_TYPE_IPv4) {
95 ipv4_hdr = (struct ipv4_hdr *)l3_hdr;
96 ipv4_hdr->hdr_checksum = 0;
97 ol_flags |= PKT_TX_IPV4;
98 ol_flags |= PKT_TX_IP_CKSUM;
99 info->l3_len = sizeof(struct ipv4_hdr);
100 l4_proto = ipv4_hdr->next_proto_id;
101 } else if (ethertype == ETHER_TYPE_IPv6) {
102 ipv6_hdr = (struct ipv6_hdr *)l3_hdr;
103 info->l3_len = sizeof(struct ipv6_hdr);
104 l4_proto = ipv6_hdr->proto;
105 ol_flags |= PKT_TX_IPV6;
107 return 0; /* packet type not supported, nothing to do */
109 if (l4_proto == IPPROTO_UDP) {
110 udp_hdr = (struct udp_hdr *)((char *)l3_hdr + info->l3_len);
111 ol_flags |= PKT_TX_UDP_CKSUM;
112 udp_hdr->dgram_cksum = get_psd_sum(l3_hdr,
113 ethertype, ol_flags);
114 } else if (l4_proto == IPPROTO_TCP) {
115 tcp_hdr = (struct tcp_hdr *)((char *)l3_hdr + info->l3_len);
116 /* Put PKT_TX_TCP_SEG bit setting before get_psd_sum(), because
117 * it depends on PKT_TX_TCP_SEG to calculate pseudo-header
120 if (tso_segsz != 0) {
121 ol_flags |= PKT_TX_TCP_SEG;
122 info->tso_segsz = tso_segsz;
123 info->l4_len = (tcp_hdr->data_off & 0xf0) >> 2;
125 ol_flags |= PKT_TX_TCP_CKSUM;
126 tcp_hdr->cksum = get_psd_sum(l3_hdr, ethertype, ol_flags);
128 } else if (l4_proto == IPPROTO_SCTP) {
129 sctp_hdr = (struct sctp_hdr *)((char *)l3_hdr + info->l3_len);
131 ol_flags |= PKT_TX_SCTP_CKSUM;
138 decapsulation(struct rte_mbuf *pkt)
140 uint8_t l4_proto = 0;
141 uint16_t outer_header_len;
142 struct udp_hdr *udp_hdr;
143 union tunnel_offload_info info = { .data = 0 };
144 struct ether_hdr *phdr = rte_pktmbuf_mtod(pkt, struct ether_hdr *);
146 parse_ethernet(phdr, &info, &l4_proto);
148 if (l4_proto != IPPROTO_UDP)
151 udp_hdr = (struct udp_hdr *)((char *)phdr +
152 info.outer_l2_len + info.outer_l3_len);
154 /** check udp destination port, 4789 is the default vxlan port
155 * (rfc7348) or that the rx offload flag is set (i40e only
157 if (udp_hdr->dst_port != rte_cpu_to_be_16(DEFAULT_VXLAN_PORT) &&
158 (pkt->packet_type & RTE_PTYPE_TUNNEL_MASK) == 0)
160 outer_header_len = info.outer_l2_len + info.outer_l3_len
161 + sizeof(struct udp_hdr) + sizeof(struct vxlan_hdr);
163 rte_pktmbuf_adj(pkt, outer_header_len);
169 encapsulation(struct rte_mbuf *m, uint8_t queue_id)
172 uint64_t ol_flags = 0;
173 uint32_t old_len = m->pkt_len, hash;
174 union tunnel_offload_info tx_offload = { .data = 0 };
175 struct ether_hdr *phdr = rte_pktmbuf_mtod(m, struct ether_hdr *);
177 /*Allocate space for new ethernet, IPv4, UDP and VXLAN headers*/
178 struct ether_hdr *pneth = (struct ether_hdr *) rte_pktmbuf_prepend(m,
179 sizeof(struct ether_hdr) + sizeof(struct ipv4_hdr)
180 + sizeof(struct udp_hdr) + sizeof(struct vxlan_hdr));
182 struct ipv4_hdr *ip = (struct ipv4_hdr *) &pneth[1];
183 struct udp_hdr *udp = (struct udp_hdr *) &ip[1];
184 struct vxlan_hdr *vxlan = (struct vxlan_hdr *) &udp[1];
186 /* convert TX queue ID to vport ID */
187 vport_id = queue_id - 1;
189 /* replace original Ethernet header with ours */
190 pneth = rte_memcpy(pneth, &app_l2_hdr[vport_id],
191 sizeof(struct ether_hdr));
193 /* copy in IP header */
194 ip = rte_memcpy(ip, &app_ip_hdr[vport_id],
195 sizeof(struct ipv4_hdr));
196 ip->total_length = rte_cpu_to_be_16(m->pkt_len
197 - sizeof(struct ether_hdr));
199 /* outer IP checksum */
200 ol_flags |= PKT_TX_OUTER_IP_CKSUM;
201 ip->hdr_checksum = 0;
203 /* inner IP checksum offload */
205 ol_flags |= process_inner_cksums(phdr, &tx_offload);
206 m->l2_len = tx_offload.l2_len;
207 m->l3_len = tx_offload.l3_len;
208 m->l4_len = tx_offload.l4_len;
209 m->l2_len += ETHER_VXLAN_HLEN;
212 m->outer_l2_len = sizeof(struct ether_hdr);
213 m->outer_l3_len = sizeof(struct ipv4_hdr);
215 ol_flags |= PKT_TX_TUNNEL_VXLAN;
217 m->ol_flags |= ol_flags;
218 m->tso_segsz = tx_offload.tso_segsz;
221 vxlan->vx_flags = rte_cpu_to_be_32(VXLAN_HF_VNI);
222 vxlan->vx_vni = rte_cpu_to_be_32(vxdev.out_key << 8);
225 udp->dgram_cksum = 0;
226 udp->dgram_len = rte_cpu_to_be_16(old_len
227 + sizeof(struct udp_hdr)
228 + sizeof(struct vxlan_hdr));
230 udp->dst_port = rte_cpu_to_be_16(vxdev.dst_port);
231 hash = rte_hash_crc(phdr, 2 * ETHER_ADDR_LEN, phdr->ether_type);
232 udp->src_port = rte_cpu_to_be_16((((uint64_t) hash * PORT_RANGE) >> 32)