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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright 2016 6WIND S.A.
*/
#ifndef _RTE_NET_PTYPE_H_
#define _RTE_NET_PTYPE_H_
#ifdef __cplusplus
extern "C" {
#endif
#include <rte_ip.h>
#include <rte_udp.h>
#include <rte_tcp.h>
#include <rte_sctp.h>
/**
* Structure containing header lengths associated to a packet, filled
* by rte_net_get_ptype().
*/
struct rte_net_hdr_lens {
uint8_t l2_len;
uint8_t l3_len;
uint8_t l4_len;
uint8_t tunnel_len;
uint8_t inner_l2_len;
uint8_t inner_l3_len;
uint8_t inner_l4_len;
};
/**
* Skip IPv6 header extensions.
*
* This function skips all IPv6 extensions, returning size of
* complete header including options and final protocol value.
*
* @warning
* @b EXPERIMENTAL: this API may change without prior notice
*
* @param proto
* Protocol field of IPv6 header.
* @param m
* The packet mbuf to be parsed.
* @param off
* On input, must contain the offset to the first byte following
* IPv6 header, on output, contains offset to the first byte
* of next layer (after any IPv6 extension header)
* @param frag
* Contains 1 in output if packet is an IPv6 fragment.
* @return
* Protocol that follows IPv6 header.
* -1 if an error occurs during mbuf parsing.
*/
__rte_experimental
int
rte_net_skip_ip6_ext(uint16_t proto, const struct rte_mbuf *m, uint32_t *off,
int *frag);
/**
* Parse an Ethernet packet to get its packet type.
*
* This function parses the network headers in mbuf data and return its
* packet type.
*
* If it is provided by the user, it also fills a rte_net_hdr_lens
* structure that contains the lengths of the parsed network
* headers. Each length field is valid only if the associated packet
* type is set. For instance, hdr_lens->l2_len is valid only if
* (retval & RTE_PTYPE_L2_MASK) != RTE_PTYPE_UNKNOWN.
*
* Supported packet types are:
* L2: Ether, Vlan, QinQ
* L3: IPv4, IPv6
* L4: TCP, UDP, SCTP
* Tunnels: IPv4, IPv6, Gre, Nvgre
*
* @param m
* The packet mbuf to be parsed.
* @param hdr_lens
* A pointer to a structure where the header lengths will be returned,
* or NULL.
* @param layers
* List of layers to parse. The function will stop at the first
* empty layer. Examples:
* - To parse all known layers, use RTE_PTYPE_ALL_MASK.
* - To parse only L2 and L3, use RTE_PTYPE_L2_MASK | RTE_PTYPE_L3_MASK
* @return
* The packet type of the packet.
*/
uint32_t rte_net_get_ptype(const struct rte_mbuf *m,
struct rte_net_hdr_lens *hdr_lens, uint32_t layers);
/**
* Prepare pseudo header checksum
*
* This function prepares pseudo header checksum for TSO and non-TSO tcp/udp in
* provided mbufs packet data and based on the requested offload flags.
*
* - for non-TSO tcp/udp packets full pseudo-header checksum is counted and set
* in packet data,
* - for TSO the IP payload length is not included in pseudo header.
*
* This function expects that used headers are in the first data segment of
* mbuf, are not fragmented and can be safely modified.
*
* @param m
* The packet mbuf to be fixed.
* @param ol_flags
* TX offloads flags to use with this packet.
* @return
* 0 if checksum is initialized properly
*/
static inline int
rte_net_intel_cksum_flags_prepare(struct rte_mbuf *m, uint64_t ol_flags)
{
/* Initialise ipv4_hdr to avoid false positive compiler warnings. */
struct rte_ipv4_hdr *ipv4_hdr = NULL;
struct rte_ipv6_hdr *ipv6_hdr;
struct rte_tcp_hdr *tcp_hdr;
struct rte_udp_hdr *udp_hdr;
uint64_t inner_l3_offset = m->l2_len;
#ifdef RTE_LIBRTE_ETHDEV_DEBUG
/*
* Does packet set any of available offloads?
* Mainly it is required to avoid fragmented headers check if
* no offloads are requested.
*/
if (!(ol_flags & PKT_TX_OFFLOAD_MASK))
return 0;
#endif
if (ol_flags & (PKT_TX_OUTER_IPV4 | PKT_TX_OUTER_IPV6))
inner_l3_offset += m->outer_l2_len + m->outer_l3_len;
#ifdef RTE_LIBRTE_ETHDEV_DEBUG
/*
* Check if headers are fragmented.
* The check could be less strict depending on which offloads are
* requested and headers to be used, but let's keep it simple.
*/
if (unlikely(rte_pktmbuf_data_len(m) <
inner_l3_offset + m->l3_len + m->l4_len))
return -ENOTSUP;
#endif
if (ol_flags & PKT_TX_IPV4) {
ipv4_hdr = rte_pktmbuf_mtod_offset(m, struct rte_ipv4_hdr *,
inner_l3_offset);
if (ol_flags & PKT_TX_IP_CKSUM)
ipv4_hdr->hdr_checksum = 0;
}
if ((ol_flags & PKT_TX_L4_MASK) == PKT_TX_UDP_CKSUM) {
if (ol_flags & PKT_TX_IPV4) {
udp_hdr = (struct rte_udp_hdr *)((char *)ipv4_hdr +
m->l3_len);
udp_hdr->dgram_cksum = rte_ipv4_phdr_cksum(ipv4_hdr,
ol_flags);
} else {
ipv6_hdr = rte_pktmbuf_mtod_offset(m,
struct rte_ipv6_hdr *, inner_l3_offset);
/* non-TSO udp */
udp_hdr = rte_pktmbuf_mtod_offset(m,
struct rte_udp_hdr *,
inner_l3_offset + m->l3_len);
udp_hdr->dgram_cksum = rte_ipv6_phdr_cksum(ipv6_hdr,
ol_flags);
}
} else if ((ol_flags & PKT_TX_L4_MASK) == PKT_TX_TCP_CKSUM ||
(ol_flags & PKT_TX_TCP_SEG)) {
if (ol_flags & PKT_TX_IPV4) {
/* non-TSO tcp or TSO */
tcp_hdr = (struct rte_tcp_hdr *)((char *)ipv4_hdr +
m->l3_len);
tcp_hdr->cksum = rte_ipv4_phdr_cksum(ipv4_hdr,
ol_flags);
} else {
ipv6_hdr = rte_pktmbuf_mtod_offset(m,
struct rte_ipv6_hdr *, inner_l3_offset);
/* non-TSO tcp or TSO */
tcp_hdr = rte_pktmbuf_mtod_offset(m,
struct rte_tcp_hdr *,
inner_l3_offset + m->l3_len);
tcp_hdr->cksum = rte_ipv6_phdr_cksum(ipv6_hdr,
ol_flags);
}
}
return 0;
}
/**
* Prepare pseudo header checksum
*
* This function prepares pseudo header checksum for TSO and non-TSO tcp/udp in
* provided mbufs packet data.
*
* - for non-TSO tcp/udp packets full pseudo-header checksum is counted and set
* in packet data,
* - for TSO the IP payload length is not included in pseudo header.
*
* This function expects that used headers are in the first data segment of
* mbuf, are not fragmented and can be safely modified.
*
* @param m
* The packet mbuf to be fixed.
* @return
* 0 if checksum is initialized properly
*/
static inline int
rte_net_intel_cksum_prepare(struct rte_mbuf *m)
{
return rte_net_intel_cksum_flags_prepare(m, m->ol_flags);
}
#ifdef __cplusplus
}
#endif
#endif /* _RTE_NET_PTYPE_H_ */
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