lib/librte_gso/rte_gso.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2017 Intel Corporation
   3  */
   4
   5 #include <errno.h>
   6
   7 #include <rte_log.h>
   8 #include <rte_ethdev.h>
   9
  10 #include "rte_gso.h"
  11 #include "gso_common.h"
  12 #include "gso_tcp4.h"
  13 #include "gso_tunnel_tcp4.h"
  14 #include "gso_udp4.h"
  15
  16 #define ILLEGAL_UDP_GSO_CTX(ctx) \
  17         ((((ctx)->gso_types & DEV_TX_OFFLOAD_UDP_TSO) == 0) || \
  18          (ctx)->gso_size < RTE_GSO_UDP_SEG_SIZE_MIN)
  19
  20 #define ILLEGAL_TCP_GSO_CTX(ctx) \
  21         ((((ctx)->gso_types & (DEV_TX_OFFLOAD_TCP_TSO | \
  22                 DEV_TX_OFFLOAD_VXLAN_TNL_TSO | \
  23                 DEV_TX_OFFLOAD_GRE_TNL_TSO)) == 0) || \
  24                 (ctx)->gso_size < RTE_GSO_SEG_SIZE_MIN)
  25
  26 int
  27 rte_gso_segment(struct rte_mbuf *pkt,
  28                 const struct rte_gso_ctx *gso_ctx,
  29                 struct rte_mbuf **pkts_out,
  30                 uint16_t nb_pkts_out)
  31 {
  32         struct rte_mempool *direct_pool, *indirect_pool;
  33         struct rte_mbuf *pkt_seg;
  34         uint64_t ol_flags;
  35         uint16_t gso_size;
  36         uint8_t ipid_delta;
  37         int ret = 1;
  38
  39         if (pkt == NULL || pkts_out == NULL || gso_ctx == NULL ||
  40                         nb_pkts_out < 1 ||
  41                         (ILLEGAL_UDP_GSO_CTX(gso_ctx) &&
  42                          ILLEGAL_TCP_GSO_CTX(gso_ctx)))
  43                 return -EINVAL;
  44
  45         if (gso_ctx->gso_size >= pkt->pkt_len) {
  46                 pkt->ol_flags &= (~(PKT_TX_TCP_SEG | PKT_TX_UDP_SEG));
  47                 pkts_out[0] = pkt;
  48                 return 1;
  49         }
  50
  51         direct_pool = gso_ctx->direct_pool;
  52         indirect_pool = gso_ctx->indirect_pool;
  53         gso_size = gso_ctx->gso_size;
  54         ipid_delta = (gso_ctx->flag != RTE_GSO_FLAG_IPID_FIXED);
  55         ol_flags = pkt->ol_flags;
  56
  57         if ((IS_IPV4_VXLAN_TCP4(pkt->ol_flags) &&
  58                         (gso_ctx->gso_types & DEV_TX_OFFLOAD_VXLAN_TNL_TSO)) ||
  59                         ((IS_IPV4_GRE_TCP4(pkt->ol_flags) &&
  60                          (gso_ctx->gso_types & DEV_TX_OFFLOAD_GRE_TNL_TSO)))) {
  61                 pkt->ol_flags &= (~PKT_TX_TCP_SEG);
  62                 ret = gso_tunnel_tcp4_segment(pkt, gso_size, ipid_delta,
  63                                 direct_pool, indirect_pool,
  64                                 pkts_out, nb_pkts_out);
  65         } else if (IS_IPV4_TCP(pkt->ol_flags) &&
  66                         (gso_ctx->gso_types & DEV_TX_OFFLOAD_TCP_TSO)) {
  67                 pkt->ol_flags &= (~PKT_TX_TCP_SEG);
  68                 ret = gso_tcp4_segment(pkt, gso_size, ipid_delta,
  69                                 direct_pool, indirect_pool,
  70                                 pkts_out, nb_pkts_out);
  71         } else if (IS_IPV4_UDP(pkt->ol_flags) &&
  72                         (gso_ctx->gso_types & DEV_TX_OFFLOAD_UDP_TSO)) {
  73                 pkt->ol_flags &= (~PKT_TX_UDP_SEG);
  74                 ret = gso_udp4_segment(pkt, gso_size, direct_pool,
  75                                 indirect_pool, pkts_out, nb_pkts_out);
  76         } else {
  77                 /* unsupported packet, skip */
  78                 pkts_out[0] = pkt;
  79                 RTE_LOG(DEBUG, GSO, "Unsupported packet type\n");
  80                 return 1;
  81         }
  82
  83         if (ret > 1) {
  84                 pkt_seg = pkt;
  85                 while (pkt_seg) {
  86                         rte_mbuf_refcnt_update(pkt_seg, -1);
  87                         pkt_seg = pkt_seg->next;
  88                 }
  89         } else if (ret < 0) {
  90                 /* Revert the ol_flags in the event of failure. */
  91                 pkt->ol_flags = ol_flags;
  92         }
  93
  94         return ret;
  95 }