LCOV - code coverage report
Current view: top level - lib/net - rte_net.h (source / functions) Hit Total Coverage
Test: Code coverage Lines: 0 48 0.0 %
Date: 2025-08-01 17:49:26 Functions: 0 2 0.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 0 36 0.0 %

           Branch data     Line data    Source code
       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                 :            : #include <rte_ip.h>
       9                 :            : #include <rte_udp.h>
      10                 :            : #include <rte_tcp.h>
      11                 :            : 
      12                 :            : #ifdef __cplusplus
      13                 :            : extern "C" {
      14                 :            : #endif
      15                 :            : 
      16                 :            : /**
      17                 :            :  * Structure containing header lengths associated to a packet, filled
      18                 :            :  * by rte_net_get_ptype().
      19                 :            :  */
      20                 :            : struct rte_net_hdr_lens {
      21                 :            :         uint8_t l2_len;
      22                 :            :         /* Outer_L4_len + ... + inner L2_len for tunneling pkt. */
      23                 :            :         uint8_t inner_l2_len;
      24                 :            :         uint16_t l3_len;
      25                 :            :         uint16_t inner_l3_len;
      26                 :            :         /* Protocol header of tunnel packets */
      27                 :            :         uint16_t tunnel_len;
      28                 :            :         uint8_t l4_len;
      29                 :            :         uint8_t inner_l4_len;
      30                 :            : };
      31                 :            : 
      32                 :            : /**
      33                 :            :  * Skip IPv6 header extensions.
      34                 :            :  *
      35                 :            :  * This function skips all IPv6 extensions, returning size of
      36                 :            :  * complete header including options and final protocol value.
      37                 :            :  *
      38                 :            :  * @param proto
      39                 :            :  *   Protocol field of IPv6 header.
      40                 :            :  * @param m
      41                 :            :  *   The packet mbuf to be parsed.
      42                 :            :  * @param off
      43                 :            :  *   On input, must contain the offset to the first byte following
      44                 :            :  *   IPv6 header, on output, contains offset to the first byte
      45                 :            :  *   of next layer (after any IPv6 extension header)
      46                 :            :  * @param frag
      47                 :            :  *   Contains 1 in output if packet is an IPv6 fragment.
      48                 :            :  * @return
      49                 :            :  *   Protocol that follows IPv6 header.
      50                 :            :  *   -1 if an error occurs during mbuf parsing.
      51                 :            :  */
      52                 :            : int
      53                 :            : rte_net_skip_ip6_ext(uint16_t proto, const struct rte_mbuf *m, uint32_t *off,
      54                 :            :         int *frag);
      55                 :            : 
      56                 :            : /**
      57                 :            :  * Parse an Ethernet packet to get its packet type.
      58                 :            :  *
      59                 :            :  * This function parses the network headers in mbuf data and return its
      60                 :            :  * packet type.
      61                 :            :  *
      62                 :            :  * If it is provided by the user, it also fills a rte_net_hdr_lens
      63                 :            :  * structure that contains the lengths of the parsed network
      64                 :            :  * headers. Each length field is valid only if the associated packet
      65                 :            :  * type is set. For instance, hdr_lens->l2_len is valid only if
      66                 :            :  * (retval & RTE_PTYPE_L2_MASK) != RTE_PTYPE_UNKNOWN.
      67                 :            :  *
      68                 :            :  * Supported packet types are:
      69                 :            :  *   L2: Ether, Vlan, QinQ
      70                 :            :  *   L3: IPv4, IPv6
      71                 :            :  *   L4: TCP, UDP, SCTP
      72                 :            :  *   Tunnels: IPv4, IPv6, Gre, Nvgre
      73                 :            :  *
      74                 :            :  * @param m
      75                 :            :  *   The packet mbuf to be parsed.
      76                 :            :  * @param hdr_lens
      77                 :            :  *   A pointer to a structure where the header lengths will be returned,
      78                 :            :  *   or NULL.
      79                 :            :  * @param layers
      80                 :            :  *   List of layers to parse. The function will stop at the first
      81                 :            :  *   empty layer. Examples:
      82                 :            :  *   - To parse all known layers, use RTE_PTYPE_ALL_MASK.
      83                 :            :  *   - To parse only L2 and L3, use RTE_PTYPE_L2_MASK | RTE_PTYPE_L3_MASK
      84                 :            :  * @return
      85                 :            :  *   The packet type of the packet.
      86                 :            :  */
      87                 :            : uint32_t rte_net_get_ptype(const struct rte_mbuf *m,
      88                 :            :         struct rte_net_hdr_lens *hdr_lens, uint32_t layers);
      89                 :            : 
      90                 :            : /**
      91                 :            :  * Prepare pseudo header checksum
      92                 :            :  *
      93                 :            :  * This function prepares pseudo header checksum for TSO and non-TSO tcp/udp in
      94                 :            :  * provided mbufs packet data and based on the requested offload flags.
      95                 :            :  *
      96                 :            :  * - for non-TSO tcp/udp packets full pseudo-header checksum is counted and set
      97                 :            :  *   in packet data,
      98                 :            :  * - for TSO the IP payload length is not included in pseudo header.
      99                 :            :  *
     100                 :            :  * This function expects that used headers are in the first data segment of
     101                 :            :  * mbuf, are not fragmented and can be safely modified.
     102                 :            :  *
     103                 :            :  * @param m
     104                 :            :  *   The packet mbuf to be fixed.
     105                 :            :  * @param ol_flags
     106                 :            :  *   TX offloads flags to use with this packet.
     107                 :            :  * @return
     108                 :            :  *   0 if checksum is initialized properly
     109                 :            :  */
     110                 :            : static inline int
     111                 :          0 : rte_net_intel_cksum_flags_prepare(struct rte_mbuf *m, uint64_t ol_flags)
     112                 :            : {
     113                 :            :         const uint64_t inner_requests = RTE_MBUF_F_TX_IP_CKSUM | RTE_MBUF_F_TX_L4_MASK |
     114                 :            :                 RTE_MBUF_F_TX_TCP_SEG | RTE_MBUF_F_TX_UDP_SEG;
     115                 :            :         const uint64_t outer_requests = RTE_MBUF_F_TX_OUTER_IP_CKSUM |
     116                 :            :                 RTE_MBUF_F_TX_OUTER_UDP_CKSUM;
     117                 :            :         /* Initialise ipv4_hdr to avoid false positive compiler warnings. */
     118                 :            :         struct rte_ipv4_hdr *ipv4_hdr = NULL;
     119                 :            :         struct rte_ipv6_hdr *ipv6_hdr;
     120                 :            :         struct rte_tcp_hdr *tcp_hdr;
     121                 :            :         struct rte_udp_hdr *udp_hdr;
     122                 :          0 :         uint64_t inner_l3_offset = m->l2_len;
     123                 :            : 
     124                 :            :         /*
     125                 :            :          * Does packet set any of available offloads?
     126                 :            :          * Mainly it is required to avoid fragmented headers check if
     127                 :            :          * no offloads are requested.
     128                 :            :          */
     129         [ #  # ]:          0 :         if (!(ol_flags & (inner_requests | outer_requests)))
     130                 :            :                 return 0;
     131                 :            : 
     132         [ #  # ]:          0 :         if (ol_flags & (RTE_MBUF_F_TX_OUTER_IPV4 | RTE_MBUF_F_TX_OUTER_IPV6)) {
     133                 :          0 :                 inner_l3_offset += m->outer_l2_len + m->outer_l3_len;
     134                 :            :                 /*
     135                 :            :                  * prepare outer IPv4 header checksum by setting it to 0,
     136                 :            :                  * in order to be computed by hardware NICs.
     137                 :            :                  */
     138         [ #  # ]:          0 :                 if (ol_flags & RTE_MBUF_F_TX_OUTER_IP_CKSUM) {
     139                 :          0 :                         ipv4_hdr = rte_pktmbuf_mtod_offset(m,
     140                 :            :                                         struct rte_ipv4_hdr *, m->outer_l2_len);
     141                 :          0 :                         ipv4_hdr->hdr_checksum = 0;
     142                 :            :                 }
     143         [ #  # ]:          0 :                 if (ol_flags & RTE_MBUF_F_TX_OUTER_UDP_CKSUM || ol_flags & inner_requests) {
     144         [ #  # ]:          0 :                         if (ol_flags & RTE_MBUF_F_TX_OUTER_IPV4) {
     145                 :          0 :                                 ipv4_hdr = rte_pktmbuf_mtod_offset(m, struct rte_ipv4_hdr *,
     146                 :            :                                         m->outer_l2_len);
     147                 :          0 :                                 udp_hdr = (struct rte_udp_hdr *)((char *)ipv4_hdr +
     148                 :          0 :                                         m->outer_l3_len);
     149         [ #  # ]:          0 :                                 if (ol_flags & RTE_MBUF_F_TX_OUTER_UDP_CKSUM)
     150                 :          0 :                                         udp_hdr->dgram_cksum = rte_ipv4_phdr_cksum(ipv4_hdr,
     151                 :            :                                                 m->ol_flags);
     152         [ #  # ]:          0 :                                 else if (ipv4_hdr->next_proto_id == IPPROTO_UDP)
     153                 :          0 :                                         udp_hdr->dgram_cksum = 0;
     154                 :            :                         } else {
     155                 :          0 :                                 ipv6_hdr = rte_pktmbuf_mtod_offset(m, struct rte_ipv6_hdr *,
     156                 :            :                                         m->outer_l2_len);
     157                 :          0 :                                 udp_hdr = rte_pktmbuf_mtod_offset(m, struct rte_udp_hdr *,
     158                 :            :                                          m->outer_l2_len + m->outer_l3_len);
     159         [ #  # ]:          0 :                                 if (ol_flags & RTE_MBUF_F_TX_OUTER_UDP_CKSUM)
     160                 :          0 :                                         udp_hdr->dgram_cksum = rte_ipv6_phdr_cksum(ipv6_hdr,
     161                 :            :                                                 m->ol_flags);
     162         [ #  # ]:          0 :                                 else if (ipv6_hdr->proto == IPPROTO_UDP)
     163                 :          0 :                                         udp_hdr->dgram_cksum = 0;
     164                 :            :                         }
     165                 :            :                 }
     166                 :            :         }
     167                 :            : 
     168                 :            :         /*
     169                 :            :          * Check if headers are fragmented.
     170                 :            :          * The check could be less strict depending on which offloads are
     171                 :            :          * requested and headers to be used, but let's keep it simple.
     172                 :            :          */
     173         [ #  # ]:          0 :         if (unlikely(rte_pktmbuf_data_len(m) <
     174                 :            :                      inner_l3_offset + m->l3_len + m->l4_len))
     175                 :            :                 return -ENOTSUP;
     176                 :            : 
     177         [ #  # ]:          0 :         if (ol_flags & RTE_MBUF_F_TX_IPV4) {
     178                 :          0 :                 ipv4_hdr = rte_pktmbuf_mtod_offset(m, struct rte_ipv4_hdr *,
     179                 :            :                                 inner_l3_offset);
     180                 :            : 
     181         [ #  # ]:          0 :                 if (ol_flags & RTE_MBUF_F_TX_IP_CKSUM)
     182                 :          0 :                         ipv4_hdr->hdr_checksum = 0;
     183                 :            :         }
     184                 :            : 
     185         [ #  # ]:          0 :         if ((ol_flags & RTE_MBUF_F_TX_L4_MASK) == RTE_MBUF_F_TX_UDP_CKSUM ||
     186         [ #  # ]:          0 :                         (ol_flags & RTE_MBUF_F_TX_UDP_SEG)) {
     187         [ #  # ]:          0 :                 if (ol_flags & RTE_MBUF_F_TX_IPV4) {
     188                 :          0 :                         udp_hdr = (struct rte_udp_hdr *)((char *)ipv4_hdr +
     189                 :          0 :                                         m->l3_len);
     190                 :          0 :                         udp_hdr->dgram_cksum = rte_ipv4_phdr_cksum(ipv4_hdr,
     191                 :            :                                         ol_flags);
     192                 :            :                 } else {
     193                 :          0 :                         ipv6_hdr = rte_pktmbuf_mtod_offset(m,
     194                 :            :                                 struct rte_ipv6_hdr *, inner_l3_offset);
     195                 :            :                         /* non-TSO udp */
     196                 :          0 :                         udp_hdr = rte_pktmbuf_mtod_offset(m,
     197                 :            :                                         struct rte_udp_hdr *,
     198                 :            :                                         inner_l3_offset + m->l3_len);
     199                 :          0 :                         udp_hdr->dgram_cksum = rte_ipv6_phdr_cksum(ipv6_hdr,
     200                 :            :                                         ol_flags);
     201                 :            :                 }
     202         [ #  # ]:          0 :         } else if ((ol_flags & RTE_MBUF_F_TX_L4_MASK) == RTE_MBUF_F_TX_TCP_CKSUM ||
     203         [ #  # ]:          0 :                         (ol_flags & RTE_MBUF_F_TX_TCP_SEG)) {
     204         [ #  # ]:          0 :                 if (ol_flags & RTE_MBUF_F_TX_IPV4) {
     205                 :            :                         /* non-TSO tcp or TSO */
     206                 :          0 :                         tcp_hdr = (struct rte_tcp_hdr *)((char *)ipv4_hdr +
     207                 :          0 :                                         m->l3_len);
     208                 :          0 :                         tcp_hdr->cksum = rte_ipv4_phdr_cksum(ipv4_hdr,
     209                 :            :                                         ol_flags);
     210                 :            :                 } else {
     211                 :          0 :                         ipv6_hdr = rte_pktmbuf_mtod_offset(m,
     212                 :            :                                 struct rte_ipv6_hdr *, inner_l3_offset);
     213                 :            :                         /* non-TSO tcp or TSO */
     214                 :          0 :                         tcp_hdr = rte_pktmbuf_mtod_offset(m,
     215                 :            :                                         struct rte_tcp_hdr *,
     216                 :            :                                         inner_l3_offset + m->l3_len);
     217                 :          0 :                         tcp_hdr->cksum = rte_ipv6_phdr_cksum(ipv6_hdr,
     218                 :            :                                         ol_flags);
     219                 :            :                 }
     220                 :            :         }
     221                 :            : 
     222                 :            :         return 0;
     223                 :            : }
     224                 :            : 
     225                 :            : /**
     226                 :            :  * Prepare pseudo header checksum
     227                 :            :  *
     228                 :            :  * This function prepares pseudo header checksum for TSO and non-TSO tcp/udp in
     229                 :            :  * provided mbufs packet data.
     230                 :            :  *
     231                 :            :  * - for non-TSO tcp/udp packets full pseudo-header checksum is counted and set
     232                 :            :  *   in packet data,
     233                 :            :  * - for TSO the IP payload length is not included in pseudo header.
     234                 :            :  *
     235                 :            :  * This function expects that used headers are in the first data segment of
     236                 :            :  * mbuf, are not fragmented and can be safely modified.
     237                 :            :  *
     238                 :            :  * @param m
     239                 :            :  *   The packet mbuf to be fixed.
     240                 :            :  * @return
     241                 :            :  *   0 if checksum is initialized properly
     242                 :            :  */
     243                 :            : static inline int
     244                 :          0 : rte_net_intel_cksum_prepare(struct rte_mbuf *m)
     245                 :            : {
     246                 :          0 :         return rte_net_intel_cksum_flags_prepare(m, m->ol_flags);
     247                 :            : }
     248                 :            : 
     249                 :            : #ifdef __cplusplus
     250                 :            : }
     251                 :            : #endif
     252                 :            : 
     253                 :            : 
     254                 :            : #endif /* _RTE_NET_PTYPE_H_ */

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