1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright 2016 6WIND S.A.
5 #ifndef _RTE_NET_PTYPE_H_
6 #define _RTE_NET_PTYPE_H_
18 * Structure containing header lengths associated to a packet, filled
19 * by rte_net_get_ptype().
21 struct rte_net_hdr_lens {
32 * Skip IPv6 header extensions.
34 * This function skips all IPv6 extensions, returning size of
35 * complete header including options and final protocol value.
38 * @b EXPERIMENTAL: this API may change without prior notice
41 * Protocol field of IPv6 header.
43 * The packet mbuf to be parsed.
45 * On input, must contain the offset to the first byte following
46 * IPv6 header, on output, contains offset to the first byte
47 * of next layer (after any IPv6 extension header)
49 * Contains 1 in output if packet is an IPv6 fragment.
51 * Protocol that follows IPv6 header.
52 * -1 if an error occurs during mbuf parsing.
56 rte_net_skip_ip6_ext(uint16_t proto, const struct rte_mbuf *m, uint32_t *off,
60 * Parse an Ethernet packet to get its packet type.
62 * This function parses the network headers in mbuf data and return its
65 * If it is provided by the user, it also fills a rte_net_hdr_lens
66 * structure that contains the lengths of the parsed network
67 * headers. Each length field is valid only if the associated packet
68 * type is set. For instance, hdr_lens->l2_len is valid only if
69 * (retval & RTE_PTYPE_L2_MASK) != RTE_PTYPE_UNKNOWN.
71 * Supported packet types are:
72 * L2: Ether, Vlan, QinQ
75 * Tunnels: IPv4, IPv6, Gre, Nvgre
78 * The packet mbuf to be parsed.
80 * A pointer to a structure where the header lengths will be returned,
83 * List of layers to parse. The function will stop at the first
84 * empty layer. Examples:
85 * - To parse all known layers, use RTE_PTYPE_ALL_MASK.
86 * - To parse only L2 and L3, use RTE_PTYPE_L2_MASK | RTE_PTYPE_L3_MASK
88 * The packet type of the packet.
90 uint32_t rte_net_get_ptype(const struct rte_mbuf *m,
91 struct rte_net_hdr_lens *hdr_lens, uint32_t layers);
94 * Prepare pseudo header checksum
96 * This function prepares pseudo header checksum for TSO and non-TSO tcp/udp in
97 * provided mbufs packet data and based on the requested offload flags.
99 * - for non-TSO tcp/udp packets full pseudo-header checksum is counted and set
101 * - for TSO the IP payload length is not included in pseudo header.
103 * This function expects that used headers are in the first data segment of
104 * mbuf, are not fragmented and can be safely modified.
107 * The packet mbuf to be fixed.
109 * TX offloads flags to use with this packet.
111 * 0 if checksum is initialized properly
114 rte_net_intel_cksum_flags_prepare(struct rte_mbuf *m, uint64_t ol_flags)
116 /* Initialise ipv4_hdr to avoid false positive compiler warnings. */
117 struct rte_ipv4_hdr *ipv4_hdr = NULL;
118 struct rte_ipv6_hdr *ipv6_hdr;
119 struct rte_tcp_hdr *tcp_hdr;
120 struct rte_udp_hdr *udp_hdr;
121 uint64_t inner_l3_offset = m->l2_len;
123 #ifdef RTE_LIBRTE_ETHDEV_DEBUG
125 * Does packet set any of available offloads?
126 * Mainly it is required to avoid fragmented headers check if
127 * no offloads are requested.
129 if (!(ol_flags & PKT_TX_OFFLOAD_MASK))
133 if (ol_flags & (PKT_TX_OUTER_IPV4 | PKT_TX_OUTER_IPV6))
134 inner_l3_offset += m->outer_l2_len + m->outer_l3_len;
136 #ifdef RTE_LIBRTE_ETHDEV_DEBUG
138 * Check if headers are fragmented.
139 * The check could be less strict depending on which offloads are
140 * requested and headers to be used, but let's keep it simple.
142 if (unlikely(rte_pktmbuf_data_len(m) <
143 inner_l3_offset + m->l3_len + m->l4_len))
147 if (ol_flags & PKT_TX_IPV4) {
148 ipv4_hdr = rte_pktmbuf_mtod_offset(m, struct rte_ipv4_hdr *,
151 if (ol_flags & PKT_TX_IP_CKSUM)
152 ipv4_hdr->hdr_checksum = 0;
155 if ((ol_flags & PKT_TX_L4_MASK) == PKT_TX_UDP_CKSUM) {
156 if (ol_flags & PKT_TX_IPV4) {
157 udp_hdr = (struct rte_udp_hdr *)((char *)ipv4_hdr +
159 udp_hdr->dgram_cksum = rte_ipv4_phdr_cksum(ipv4_hdr,
162 ipv6_hdr = rte_pktmbuf_mtod_offset(m,
163 struct rte_ipv6_hdr *, inner_l3_offset);
165 udp_hdr = rte_pktmbuf_mtod_offset(m,
166 struct rte_udp_hdr *,
167 inner_l3_offset + m->l3_len);
168 udp_hdr->dgram_cksum = rte_ipv6_phdr_cksum(ipv6_hdr,
171 } else if ((ol_flags & PKT_TX_L4_MASK) == PKT_TX_TCP_CKSUM ||
172 (ol_flags & PKT_TX_TCP_SEG)) {
173 if (ol_flags & PKT_TX_IPV4) {
174 /* non-TSO tcp or TSO */
175 tcp_hdr = (struct rte_tcp_hdr *)((char *)ipv4_hdr +
177 tcp_hdr->cksum = rte_ipv4_phdr_cksum(ipv4_hdr,
180 ipv6_hdr = rte_pktmbuf_mtod_offset(m,
181 struct rte_ipv6_hdr *, inner_l3_offset);
182 /* non-TSO tcp or TSO */
183 tcp_hdr = rte_pktmbuf_mtod_offset(m,
184 struct rte_tcp_hdr *,
185 inner_l3_offset + m->l3_len);
186 tcp_hdr->cksum = rte_ipv6_phdr_cksum(ipv6_hdr,
195 * Prepare pseudo header checksum
197 * This function prepares pseudo header checksum for TSO and non-TSO tcp/udp in
198 * provided mbufs packet data.
200 * - for non-TSO tcp/udp packets full pseudo-header checksum is counted and set
202 * - for TSO the IP payload length is not included in pseudo header.
204 * This function expects that used headers are in the first data segment of
205 * mbuf, are not fragmented and can be safely modified.
208 * The packet mbuf to be fixed.
210 * 0 if checksum is initialized properly
213 rte_net_intel_cksum_prepare(struct rte_mbuf *m)
215 return rte_net_intel_cksum_flags_prepare(m, m->ol_flags);
223 #endif /* _RTE_NET_PTYPE_H_ */