Line data    Source code

       1             : /*
       2             :  * l2_bvi.c : layer 2 Bridged Virtual Interface
       3             :  *
       4             :  * Copyright (c) 2013 Cisco and/or its affiliates.
       5             :  * Licensed under the Apache License, Version 2.0 (the "License");
       6             :  * you may not use this file except in compliance with the License.
       7             :  * You may obtain a copy of the License at:
       8             :  *
       9             :  *     http://www.apache.org/licenses/LICENSE-2.0
      10             :  *
      11             :  * Unless required by applicable law or agreed to in writing, software
      12             :  * distributed under the License is distributed on an "AS IS" BASIS,
      13             :  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      14             :  * See the License for the specific language governing permissions and
      15             :  * limitations under the License.
      16             :  */
      17             : 
      18             : #include <vnet/l2/l2_bvi.h>
      19             : 
      20             : /**
      21             :  * send packets to l2-input.
      22             :  */
      23        2238 : VNET_DEVICE_CLASS_TX_FN (bvi_device_class) (vlib_main_t * vm,
      24             :                                             vlib_node_runtime_t * node,
      25             :                                             vlib_frame_t * frame)
      26             : {
      27             :   u32 sw_if_indices[VLIB_FRAME_SIZE], *sw_if_index;
      28             :   vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
      29             :   u16 nexts[VLIB_FRAME_SIZE];
      30             :   u32 n_left, *from;
      31             : 
      32           2 :   n_left = frame->n_vectors;
      33           2 :   from = vlib_frame_vector_args (frame);
      34             : 
      35           2 :   vlib_get_buffers (vm, from, bufs, n_left);
      36             : 
      37           2 :   b = bufs;
      38           2 :   sw_if_index = sw_if_indices;
      39             : 
      40             :   /* It's all going to l2-input */
      41           2 :   clib_memset_u16 (nexts, 0, VLIB_FRAME_SIZE);
      42             : 
      43             :   /*
      44             :    * For each packet:
      45             :    *  - fixup the L2 length of the packet
      46             :    *  - set the RX interface (which the bridge will use) to the
      47             :    *    TX interface (which routing has chosen)
      48             :    *  - Set the TX interface to the special ID so the DP knows this is a BVI
      49             :    * Don't counts packets and bytes, that's done in the bviX-output node
      50             :    */
      51          66 :   while (n_left >= 4)
      52             :     {
      53             :       /* Prefetch next iteration. */
      54          64 :       if (PREDICT_TRUE (n_left >= 8))
      55             :         {
      56             :           /* LOAD pre-fetch since meta and packet data is read */
      57          63 :           vlib_prefetch_buffer_header (b[4], LOAD);
      58          63 :           vlib_prefetch_buffer_header (b[5], LOAD);
      59          63 :           vlib_prefetch_buffer_header (b[6], LOAD);
      60          63 :           vlib_prefetch_buffer_header (b[7], LOAD);
      61             : 
      62          63 :           vlib_prefetch_buffer_data (b[4], LOAD);
      63          63 :           vlib_prefetch_buffer_data (b[5], LOAD);
      64          63 :           vlib_prefetch_buffer_data (b[6], LOAD);
      65          63 :           vlib_prefetch_buffer_data (b[7], LOAD);
      66             :         }
      67             : 
      68          64 :       vnet_update_l2_len (b[0]);
      69          64 :       vnet_update_l2_len (b[1]);
      70          64 :       vnet_update_l2_len (b[2]);
      71          64 :       vnet_update_l2_len (b[3]);
      72             : 
      73          64 :       sw_if_index[0] = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
      74          64 :       sw_if_index[1] = vnet_buffer (b[1])->sw_if_index[VLIB_TX];
      75          64 :       sw_if_index[2] = vnet_buffer (b[2])->sw_if_index[VLIB_TX];
      76          64 :       sw_if_index[3] = vnet_buffer (b[3])->sw_if_index[VLIB_TX];
      77             : 
      78          64 :       vnet_buffer (b[0])->sw_if_index[VLIB_TX] = L2INPUT_BVI;
      79          64 :       vnet_buffer (b[1])->sw_if_index[VLIB_TX] = L2INPUT_BVI;
      80          64 :       vnet_buffer (b[2])->sw_if_index[VLIB_TX] = L2INPUT_BVI;
      81          64 :       vnet_buffer (b[3])->sw_if_index[VLIB_TX] = L2INPUT_BVI;
      82             : 
      83          64 :       vnet_buffer (b[0])->sw_if_index[VLIB_RX] = sw_if_index[0];
      84          64 :       vnet_buffer (b[1])->sw_if_index[VLIB_RX] = sw_if_index[1];
      85          64 :       vnet_buffer (b[2])->sw_if_index[VLIB_RX] = sw_if_index[2];
      86          64 :       vnet_buffer (b[3])->sw_if_index[VLIB_RX] = sw_if_index[3];
      87             : 
      88          64 :       b += 4;
      89          64 :       n_left -= 4;
      90          64 :       sw_if_index += 4;
      91             :     }
      92           3 :   while (n_left)
      93             :     {
      94           1 :       sw_if_index[0] = vnet_buffer (b[0])->sw_if_index[VLIB_TX];
      95           1 :       vnet_buffer (b[0])->sw_if_index[VLIB_TX] = L2INPUT_BVI;
      96           1 :       vnet_buffer (b[0])->sw_if_index[VLIB_RX] = sw_if_index[0];
      97             : 
      98           1 :       vnet_update_l2_len (b[0]);
      99             : 
     100           1 :       b += 1;
     101           1 :       n_left -= 1;
     102           1 :       sw_if_index += 1;
     103             :     }
     104             : 
     105           2 :   vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
     106             : 
     107           2 :   return frame->n_vectors;
     108             : }
     109             : 
     110             : /*
     111             :  * fd.io coding-style-patch-verification: ON
     112             :  *
     113             :  * Local Variables:
     114             :  * eval: (c-set-style "gnu")
     115             :  * End:
     116             :  */