ceph/src/spdk/dpdk/lib/librte_net/rte_net.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright 2016 6WIND S.A.
   3  */
   4
   5 #ifndef _RTE_NET_PTYPE_H_
   6 #define _RTE_NET_PTYPE_H_
   7
   8 #ifdef __cplusplus
   9 extern "C" {
  10 #endif
  11
  12 #include <rte_ip.h>
  13 #include <rte_udp.h>
  14 #include <rte_tcp.h>
  15 #include <rte_sctp.h>
  16
  17 /**
  18  * Structure containing header lengths associated to a packet, filled
  19  * by rte_net_get_ptype().
  20  */
  21 struct rte_net_hdr_lens {
  22         uint8_t l2_len;
  23         uint8_t l3_len;
  24         uint8_t l4_len;
  25         uint8_t tunnel_len;
  26         uint8_t inner_l2_len;
  27         uint8_t inner_l3_len;
  28         uint8_t inner_l4_len;
  29 };
  30
  31 /**
  32  * Skip IPv6 header extensions.
  33  *
  34  * This function skips all IPv6 extensions, returning size of
  35  * complete header including options and final protocol value.
  36  *
  37  * @warning
  38  * @b EXPERIMENTAL: this API may change without prior notice
  39  *
  40  * @param proto
  41  *   Protocol field of IPv6 header.
  42  * @param m
  43  *   The packet mbuf to be parsed.
  44  * @param off
  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)
  48  * @param frag
  49  *   Contains 1 in output if packet is an IPv6 fragment.
  50  * @return
  51  *   Protocol that follows IPv6 header.
  52  *   -1 if an error occurs during mbuf parsing.
  53  */
  54 int __rte_experimental
  55 rte_net_skip_ip6_ext(uint16_t proto, const struct rte_mbuf *m, uint32_t *off,
  56         int *frag);
  57
  58 /**
  59  * Parse an Ethernet packet to get its packet type.
  60  *
  61  * This function parses the network headers in mbuf data and return its
  62  * packet type.
  63  *
  64  * If it is provided by the user, it also fills a rte_net_hdr_lens
  65  * structure that contains the lengths of the parsed network
  66  * headers. Each length field is valid only if the associated packet
  67  * type is set. For instance, hdr_lens->l2_len is valid only if
  68  * (retval & RTE_PTYPE_L2_MASK) != RTE_PTYPE_UNKNOWN.
  69  *
  70  * Supported packet types are:
  71  *   L2: Ether, Vlan, QinQ
  72  *   L3: IPv4, IPv6
  73  *   L4: TCP, UDP, SCTP
  74  *   Tunnels: IPv4, IPv6, Gre, Nvgre
  75  *
  76  * @param m
  77  *   The packet mbuf to be parsed.
  78  * @param hdr_lens
  79  *   A pointer to a structure where the header lengths will be returned,
  80  *   or NULL.
  81  * @param layers
  82  *   List of layers to parse. The function will stop at the first
  83  *   empty layer. Examples:
  84  *   - To parse all known layers, use RTE_PTYPE_ALL_MASK.
  85  *   - To parse only L2 and L3, use RTE_PTYPE_L2_MASK | RTE_PTYPE_L3_MASK
  86  * @return
  87  *   The packet type of the packet.
  88  */
  89 uint32_t rte_net_get_ptype(const struct rte_mbuf *m,
  90         struct rte_net_hdr_lens *hdr_lens, uint32_t layers);
  91
  92 /**
  93  * Prepare pseudo header checksum
  94  *
  95  * This function prepares pseudo header checksum for TSO and non-TSO tcp/udp in
  96  * provided mbufs packet data and based on the requested offload flags.
  97  *
  98  * - for non-TSO tcp/udp packets full pseudo-header checksum is counted and set
  99  *   in packet data,
 100  * - for TSO the IP payload length is not included in pseudo header.
 101  *
 102  * This function expects that used headers are in the first data segment of
 103  * mbuf, are not fragmented and can be safely modified.
 104  *
 105  * @param m
 106  *   The packet mbuf to be fixed.
 107  * @param ol_flags
 108  *   TX offloads flags to use with this packet.
 109  * @return
 110  *   0 if checksum is initialized properly
 111  */
 112 static inline int
 113 rte_net_intel_cksum_flags_prepare(struct rte_mbuf *m, uint64_t ol_flags)
 114 {
 115         struct ipv4_hdr *ipv4_hdr;
 116         struct ipv6_hdr *ipv6_hdr;
 117         struct tcp_hdr *tcp_hdr;
 118         struct udp_hdr *udp_hdr;
 119         uint64_t inner_l3_offset = m->l2_len;
 120
 121         if ((ol_flags & PKT_TX_OUTER_IP_CKSUM) ||
 122                 (ol_flags & PKT_TX_OUTER_IPV6))
 123                 inner_l3_offset += m->outer_l2_len + m->outer_l3_len;
 124
 125         if ((ol_flags & PKT_TX_UDP_CKSUM) == PKT_TX_UDP_CKSUM) {
 126                 if (ol_flags & PKT_TX_IPV4) {
 127                         ipv4_hdr = rte_pktmbuf_mtod_offset(m, struct ipv4_hdr *,
 128                                         inner_l3_offset);
 129
 130                         if (ol_flags & PKT_TX_IP_CKSUM)
 131                                 ipv4_hdr->hdr_checksum = 0;
 132
 133                         udp_hdr = (struct udp_hdr *)((char *)ipv4_hdr +
 134                                         m->l3_len);
 135                         udp_hdr->dgram_cksum = rte_ipv4_phdr_cksum(ipv4_hdr,
 136                                         ol_flags);
 137                 } else {
 138                         ipv6_hdr = rte_pktmbuf_mtod_offset(m, struct ipv6_hdr *,
 139                                         inner_l3_offset);
 140                         /* non-TSO udp */
 141                         udp_hdr = rte_pktmbuf_mtod_offset(m, struct udp_hdr *,
 142                                         inner_l3_offset + m->l3_len);
 143                         udp_hdr->dgram_cksum = rte_ipv6_phdr_cksum(ipv6_hdr,
 144                                         ol_flags);
 145                 }
 146         } else if ((ol_flags & PKT_TX_TCP_CKSUM) ||
 147                         (ol_flags & PKT_TX_TCP_SEG)) {
 148                 if (ol_flags & PKT_TX_IPV4) {
 149                         ipv4_hdr = rte_pktmbuf_mtod_offset(m, struct ipv4_hdr *,
 150                                         inner_l3_offset);
 151
 152                         if (ol_flags & PKT_TX_IP_CKSUM)
 153                                 ipv4_hdr->hdr_checksum = 0;
 154
 155                         /* non-TSO tcp or TSO */
 156                         tcp_hdr = (struct tcp_hdr *)((char *)ipv4_hdr +
 157                                         m->l3_len);
 158                         tcp_hdr->cksum = rte_ipv4_phdr_cksum(ipv4_hdr,
 159                                         ol_flags);
 160                 } else {
 161                         ipv6_hdr = rte_pktmbuf_mtod_offset(m, struct ipv6_hdr *,
 162                                         inner_l3_offset);
 163                         /* non-TSO tcp or TSO */
 164                         tcp_hdr = rte_pktmbuf_mtod_offset(m, struct tcp_hdr *,
 165                                         inner_l3_offset + m->l3_len);
 166                         tcp_hdr->cksum = rte_ipv6_phdr_cksum(ipv6_hdr,
 167                                         ol_flags);
 168                 }
 169         }
 170
 171         return 0;
 172 }
 173
 174 /**
 175  * Prepare pseudo header checksum
 176  *
 177  * This function prepares pseudo header checksum for TSO and non-TSO tcp/udp in
 178  * provided mbufs packet data.
 179  *
 180  * - for non-TSO tcp/udp packets full pseudo-header checksum is counted and set
 181  *   in packet data,
 182  * - for TSO the IP payload length is not included in pseudo header.
 183  *
 184  * This function expects that used headers are in the first data segment of
 185  * mbuf, are not fragmented and can be safely modified.
 186  *
 187  * @param m
 188  *   The packet mbuf to be fixed.
 189  * @return
 190  *   0 if checksum is initialized properly
 191  */
 192 static inline int
 193 rte_net_intel_cksum_prepare(struct rte_mbuf *m)
 194 {
 195         return rte_net_intel_cksum_flags_prepare(m, m->ol_flags);
 196 }
 197
 198 #ifdef __cplusplus
 199 }
 200 #endif
 201
 202
 203 #endif /* _RTE_NET_PTYPE_H_ */