src/plugins/ioam/lib-vxlan-gpe/ioam_decap.c

   1 /*
   2  * Copyright (c) 2015 Cisco and/or its affiliates.
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15 #include <vppinfra/error.h>
  16 #include <vppinfra/hash.h>
  17 #include <vnet/vnet.h>
  18 #include <vnet/ip/ip.h>
  19 #include <vnet/ethernet/ethernet.h>
  20 #include <vnet/vxlan-gpe/vxlan_gpe.h>
  21 #include <vnet/vxlan-gpe/vxlan_gpe.h>
  22 #include <ioam/lib-vxlan-gpe/vxlan_gpe_ioam_packet.h>
  23 #include <ioam/lib-vxlan-gpe/vxlan_gpe_ioam.h>
  24 #include <ioam/lib-vxlan-gpe/vxlan_gpe_ioam_util.h>
  25
  26 /* Statistics (not really errors) */
  27 #define foreach_vxlan_gpe_decap_ioam_v4_error    \
  28 _(DECAPSULATED, "good packets decapsulated")
  29
  30 static char *vxlan_gpe_decap_ioam_v4_error_strings[] = {
  31 #define _(sym,string) string,
  32   foreach_vxlan_gpe_decap_ioam_v4_error
  33 #undef _
  34 };
  35
  36 typedef enum
  37 {
  38 #define _(sym,str) VXLAN_GPE_DECAP_IOAM_V4_ERROR_##sym,
  39   foreach_vxlan_gpe_decap_ioam_v4_error
  40 #undef _
  41     VXLAN_GPE_DECAP_IOAM_V4_N_ERROR,
  42 } vxlan_gpe_decap_ioam_v4_error_t;
  43
  44
  45 always_inline void
  46 vxlan_gpe_decap_ioam_v4_two_inline (vlib_main_t * vm,
  47                                     vlib_node_runtime_t * node,
  48                                     vxlan_gpe_main_t * ngm,
  49                                     vlib_buffer_t * b0, vlib_buffer_t * b1,
  50                                     u32 * next0, u32 * next1)
  51 {
  52   vxlan_gpe_ioam_main_t *hm = &vxlan_gpe_ioam_main;
  53
  54   next0[0] = next1[0] = hm->decap_v4_next_override;
  55   vxlan_gpe_encap_decap_ioam_v4_one_inline (vm, node, b0, &next0[0],
  56                                             VXLAN_GPE_DECAP_IOAM_V4_NEXT_DROP,
  57                                             0 /* use_adj */ );
  58   vxlan_gpe_encap_decap_ioam_v4_one_inline (vm, node, b1, &next0[1],
  59                                             VXLAN_GPE_DECAP_IOAM_V4_NEXT_DROP,
  60                                             0 /* use_adj */ );
  61 }
  62
  63
  64
  65 static uword
  66 vxlan_gpe_decap_ioam (vlib_main_t * vm,
  67                       vlib_node_runtime_t * node,
  68                       vlib_frame_t * from_frame, u8 is_ipv6)
  69 {
  70   u32 n_left_from, next_index, *from, *to_next;
  71   vxlan_gpe_main_t *ngm = &vxlan_gpe_main;
  72   vxlan_gpe_ioam_main_t *hm = &vxlan_gpe_ioam_main;
  73
  74   from = vlib_frame_vector_args (from_frame);
  75   n_left_from = from_frame->n_vectors;
  76
  77   next_index = node->cached_next_index;
  78
  79   while (n_left_from > 0)
  80     {
  81       u32 n_left_to_next;
  82
  83       vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
  84
  85       while (n_left_from >= 4 && n_left_to_next >= 2)
  86         {
  87           u32 bi0, bi1;
  88           vlib_buffer_t *b0, *b1;
  89           u32 next0, next1;
  90
  91           next0 = next1 = hm->decap_v4_next_override;
  92
  93           /* Prefetch next iteration. */
  94           {
  95             vlib_buffer_t *p2, *p3;
  96
  97             p2 = vlib_get_buffer (vm, from[2]);
  98             p3 = vlib_get_buffer (vm, from[3]);
  99
 100             vlib_prefetch_buffer_header (p2, LOAD);
 101             vlib_prefetch_buffer_header (p3, LOAD);
 102
 103             CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
 104             CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
 105           }
 106
 107           bi0 = from[0];
 108           bi1 = from[1];
 109           to_next[0] = bi0;
 110           to_next[1] = bi1;
 111           from += 2;
 112           to_next += 2;
 113           n_left_to_next -= 2;
 114           n_left_from -= 2;
 115
 116           b0 = vlib_get_buffer (vm, bi0);
 117           b1 = vlib_get_buffer (vm, bi1);
 118
 119
 120           vlib_buffer_advance (b0,
 121                                -(word) (sizeof (udp_header_t) +
 122                                         sizeof (ip4_header_t) +
 123                                         sizeof (vxlan_gpe_header_t)));
 124           vlib_buffer_advance (b1,
 125                                -(word) (sizeof (udp_header_t) +
 126                                         sizeof (ip4_header_t) +
 127                                         sizeof (vxlan_gpe_header_t)));
 128
 129           vxlan_gpe_decap_ioam_v4_two_inline (vm, node, ngm, b0, b1,
 130                                               &next0, &next1);
 131
 132
 133           vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
 134                                            n_left_to_next, bi0, bi1, next0,
 135                                            next1);
 136
 137           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 138             {
 139               vxlan_gpe_ioam_v4_trace_t *tr = vlib_add_trace (vm, node, b0,
 140                                                               sizeof (*tr));
 141             }
 142         }
 143
 144       while (n_left_from > 0 && n_left_to_next > 0)
 145         {
 146           u32 bi0;
 147           vlib_buffer_t *b0;
 148           u32 next0 = hm->decap_v4_next_override;
 149
 150           bi0 = from[0];
 151           to_next[0] = bi0;
 152           from += 1;
 153           to_next += 1;
 154           n_left_from -= 1;
 155           n_left_to_next -= 1;
 156
 157           b0 = vlib_get_buffer (vm, bi0);
 158
 159
 160           vlib_buffer_advance (b0,
 161                                -(word) (sizeof (udp_header_t) +
 162                                         sizeof (ip4_header_t) +
 163                                         sizeof (vxlan_gpe_header_t)));
 164
 165           next0 = hm->decap_v4_next_override;
 166           vxlan_gpe_encap_decap_ioam_v4_one_inline (vm, node, b0,
 167                                                     &next0,
 168                                                     VXLAN_GPE_DECAP_IOAM_V4_NEXT_DROP,
 169                                                     0 /* use_adj */ );
 170
 171           if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
 172             {
 173               vxlan_gpe_ioam_v4_trace_t *tr = vlib_add_trace (vm, node, b0,
 174                                                               sizeof (*tr));
 175             }
 176           vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
 177                                            n_left_to_next, bi0, next0);
 178         }
 179
 180       vlib_put_next_frame (vm, node, next_index, n_left_to_next);
 181     }
 182
 183   return from_frame->n_vectors;
 184 }
 185
 186
 187 static uword
 188 vxlan_gpe_decap_ioam_v4 (vlib_main_t * vm,
 189                          vlib_node_runtime_t * node,
 190                          vlib_frame_t * from_frame)
 191 {
 192   return vxlan_gpe_decap_ioam (vm, node, from_frame, 0);
 193 }
 194
 195
 196 /* *INDENT-OFF* */
 197 VLIB_REGISTER_NODE (vxlan_gpe_decap_ioam_v4_node) = {
 198   .function = vxlan_gpe_decap_ioam_v4,
 199   .name = "vxlan-gpe-decap-ioam-v4",
 200   .vector_size = sizeof (u32),
 201   .format_trace = format_vxlan_gpe_ioam_v4_trace,
 202   .type = VLIB_NODE_TYPE_INTERNAL,
 203
 204   .n_errors = ARRAY_LEN(vxlan_gpe_decap_ioam_v4_error_strings),
 205   .error_strings = vxlan_gpe_decap_ioam_v4_error_strings,
 206
 207   .n_next_nodes = VXLAN_GPE_DECAP_IOAM_V4_N_NEXT,
 208
 209   .next_nodes = {
 210     [VXLAN_GPE_DECAP_IOAM_V4_NEXT_POP] = "vxlan-gpe-pop-ioam-v4",
 211     [VXLAN_GPE_DECAP_IOAM_V4_NEXT_DROP] = "error-drop",
 212   },
 213 };
 214 /* *INDENT-ON* */
 215
 216
 217 /*
 218  * fd.io coding-style-patch-verification: ON
 219  *
 220  * Local Variables:
 221  * eval: (c-set-style "gnu")
 222  * End:
 223  */