Line data    Source code

       1             : /*
       2             :  * Copyright (c) 2016 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             : 
      16             : #include <vnet/bier/bier_disp_table.h>
      17             : #include <vnet/bier/bier_hdr_inlines.h>
      18             : 
      19             : /**
      20             :  * @brief A struct to hold tracing information for the MPLS label imposition
      21             :  * node.
      22             :  */
      23             : typedef struct bier_disp_lookup_trace_t_
      24             : {
      25             :     /**
      26             :      * BIER source BP used in the lookup - host order
      27             :      */
      28             :     bier_bp_t bp;
      29             :     /**
      30             :      * BIER disp table
      31             :      */
      32             :     index_t bdti;
      33             : } bier_disp_lookup_trace_t;
      34             : 
      35             : /**
      36             :  * Next nodes from BIER disposition lookup
      37             :  */
      38             : typedef enum bier_disp_lookup_next_t_
      39             : {
      40             :     BIER_DISP_LOOKUP_NEXT_DROP,
      41             :     BIER_DISP_LOOKUP_NEXT_DISPATCH,
      42             : } bier_disp_lookup_next_t;
      43             : #define BIER_DISP_LOOKUP_N_NEXT (BIER_DISP_LOOKUP_NEXT_DISPATCH+1)
      44             : 
      45             : always_inline uword
      46           7 : bier_disp_lookup_inline (vlib_main_t * vm,
      47             :                          vlib_node_runtime_t * node,
      48             :                          vlib_frame_t * from_frame)
      49             : {
      50             :     u32 n_left_from, next_index, * from, * to_next;
      51             : 
      52           7 :     from = vlib_frame_vector_args (from_frame);
      53           7 :     n_left_from = from_frame->n_vectors;
      54             : 
      55           7 :     next_index = node->cached_next_index;
      56             : 
      57          14 :     while (n_left_from > 0)
      58             :     {
      59             :         u32 n_left_to_next;
      60             : 
      61           7 :         vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next);
      62             : 
      63         147 :         while (n_left_from > 0 && n_left_to_next > 0)
      64             :         {
      65             :             const bier_hdr_t *hdr0;
      66             :             bier_hdr_src_id_t src0;
      67             :             vlib_buffer_t * b0;
      68             :             u32 bdei0, bdti0;
      69             :             u32 next0, bi0;
      70             : 
      71         140 :             bi0 = from[0];
      72         140 :             to_next[0] = bi0;
      73         140 :             from += 1;
      74         140 :             to_next += 1;
      75         140 :             n_left_from -= 1;
      76         140 :             n_left_to_next -= 1;
      77             : 
      78         140 :             b0 = vlib_get_buffer (vm, bi0);
      79             : 
      80         140 :             bdti0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
      81         140 :             hdr0 = vlib_buffer_get_current(b0);
      82             : 
      83             :             /*
      84             :              * lookup - source is in network order.
      85             :              */
      86         140 :             src0 = bier_hdr_get_src_id(hdr0);
      87         140 :             next0 = BIER_DISP_LOOKUP_NEXT_DISPATCH;
      88             : 
      89         140 :             bdei0 = bier_disp_table_lookup(bdti0, src0);
      90             : 
      91         140 :             if (PREDICT_FALSE(INDEX_INVALID == bdei0))
      92             :             {
      93             :                 /*
      94             :                  * if a specific match misses, try the default
      95             :                  */
      96           4 :                 bdei0 = bier_disp_table_lookup(bdti0, 0);
      97             : 
      98           4 :                 if (PREDICT_FALSE(INDEX_INVALID == bdei0))
      99             :                 {
     100           2 :                     next0 = BIER_DISP_LOOKUP_NEXT_DROP;
     101             :                 }
     102             :             }
     103             : 
     104         140 :             vnet_buffer(b0)->ip.adj_index[VLIB_TX] = bdei0;
     105             : 
     106         140 :             if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
     107             :             {
     108             :                 bier_disp_lookup_trace_t *tr =
     109         140 :                     vlib_add_trace (vm, node, b0, sizeof (*tr));
     110         140 :                 tr->bp = clib_net_to_host_u16(bier_hdr_get_src_id(hdr0));
     111         140 :                 tr->bdti = bdti0;
     112             :             }
     113             : 
     114         140 :             vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next,
     115             :                                             n_left_to_next, bi0, next0);
     116             :         }
     117           7 :         vlib_put_next_frame (vm, node, next_index, n_left_to_next);
     118             :     }
     119           7 :     return from_frame->n_vectors;
     120             : }
     121             : 
     122             : static u8 *
     123         175 : format_bier_disp_lookup_trace (u8 * s, va_list * args)
     124             : {
     125         175 :     CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
     126         175 :     CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
     127             :     bier_disp_lookup_trace_t * t;
     128             : 
     129         175 :     t = va_arg (*args, bier_disp_lookup_trace_t *);
     130         175 :     s = format (s, "tbl:%d src:%d", t->bdti, t->bp);
     131             : 
     132         175 :     return (s);
     133             : }
     134             : 
     135        2243 : VLIB_NODE_FN (bier_disp_lookup_node) (vlib_main_t * vm,
     136             :                   vlib_node_runtime_t * node,
     137             :                   vlib_frame_t * frame)
     138             : {
     139           7 :     return (bier_disp_lookup_inline(vm, node, frame));
     140             : }
     141             : 
     142      178120 : VLIB_REGISTER_NODE (bier_disp_lookup_node) = {
     143             :     .name = "bier-disp-lookup",
     144             :     .vector_size = sizeof (u32),
     145             : 
     146             :     .format_trace = format_bier_disp_lookup_trace,
     147             :     .n_next_nodes = BIER_DISP_LOOKUP_N_NEXT,
     148             :     .next_nodes = {
     149             :         [BIER_DISP_LOOKUP_NEXT_DROP] = "bier-drop",
     150             :         [BIER_DISP_LOOKUP_NEXT_DISPATCH] = "bier-disp-dispatch",
     151             :     }
     152             : };