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_entry.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_dispatch_trace_t_
      24             : {
      25             :     /**
      26             :      * BIER payload protocol used to dispatch
      27             :      */
      28             :     bier_hdr_proto_id_t pproto;
      29             : 
      30             :     /**
      31             :      * RPF-ID packet is tagged with
      32             :      */
      33             :     u32 rpf_id;
      34             : } bier_disp_dispatch_trace_t;
      35             : 
      36             : always_inline uword
      37           6 : bier_disp_dispatch_inline (vlib_main_t * vm,
      38             :                          vlib_node_runtime_t * node,
      39             :                          vlib_frame_t * from_frame)
      40             : {
      41             :     u32 n_left_from, next_index, * from, * to_next;
      42             : 
      43           6 :     from = vlib_frame_vector_args (from_frame);
      44           6 :     n_left_from = from_frame->n_vectors;
      45             : 
      46           6 :     next_index = node->cached_next_index;
      47             : 
      48          12 :     while (n_left_from > 0)
      49             :     {
      50             :         u32 n_left_to_next;
      51             : 
      52           6 :         vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next);
      53             : 
      54         144 :         while (n_left_from > 0 && n_left_to_next > 0)
      55             :         {
      56             :             bier_hdr_proto_id_t pproto0;
      57             :             bier_disp_entry_t *bde0;
      58             :             u32 next0, bi0, bdei0;
      59             :             const dpo_id_t *dpo0;
      60             :             vlib_buffer_t * b0;
      61             :             bier_hdr_t *hdr0;
      62             :             u32 entropy0;
      63             : 
      64         138 :             bi0 = from[0];
      65         138 :             to_next[0] = bi0;
      66         138 :             from += 1;
      67         138 :             to_next += 1;
      68         138 :             n_left_from -= 1;
      69         138 :             n_left_to_next -= 1;
      70             : 
      71         138 :             b0 = vlib_get_buffer (vm, bi0);
      72         138 :             bdei0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
      73         138 :             hdr0 = vlib_buffer_get_current(b0);
      74         138 :             bde0 = bier_disp_entry_get(bdei0);
      75         138 :             vnet_buffer(b0)->ip.adj_index[VLIB_RX] = BIER_RX_ITF;
      76             : 
      77             :             /*
      78             :              * header is in network order - flip it, we are about to
      79             :              * consume it anyway
      80             :              */
      81         138 :             bier_hdr_ntoh(hdr0);
      82         138 :             pproto0 = bier_hdr_get_proto_id(hdr0);
      83         138 :             entropy0 = bier_hdr_get_entropy(hdr0);
      84             : 
      85             :             /*
      86             :              * strip the header and copy the entropy value into
      87             :              * the packets flow-hash field
      88             :              * DSCP mumble mumble...
      89             :              */
      90         138 :             vlib_buffer_advance(b0, (vnet_buffer(b0)->mpls.bier.n_bytes +
      91             :                                      sizeof(*hdr0)));
      92         138 :             vnet_buffer(b0)->ip.flow_hash = entropy0;
      93             : 
      94             :             /*
      95             :              * use the payload proto to dispatch to the
      96             :              * correct stacked DPO.
      97             :              */
      98         138 :             dpo0 = &bde0->bde_fwd[pproto0].bde_dpo;
      99         138 :             next0 = dpo0->dpoi_next_node;
     100         138 :             vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
     101         138 :             vnet_buffer(b0)->ip.rpf_id = bde0->bde_fwd[pproto0].bde_rpf_id;
     102             : 
     103         138 :             if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
     104             :             {
     105             :                 bier_disp_dispatch_trace_t *tr =
     106         138 :                     vlib_add_trace (vm, node, b0, sizeof (*tr));
     107         138 :                 tr->pproto = pproto0;
     108         138 :                 tr->rpf_id = vnet_buffer(b0)->ip.rpf_id;
     109             :             }
     110             : 
     111         138 :             vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next,
     112             :                                             n_left_to_next, bi0, next0);
     113             :         }
     114           6 :         vlib_put_next_frame (vm, node, next_index, n_left_to_next);
     115             :     }
     116           6 :     return from_frame->n_vectors;
     117             : }
     118             : 
     119             : static u8 *
     120         173 : format_bier_disp_dispatch_trace (u8 * s, va_list * args)
     121             : {
     122         173 :     CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
     123         173 :     CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
     124             :     bier_disp_dispatch_trace_t * t;
     125             : 
     126         173 :     t = va_arg (*args, bier_disp_dispatch_trace_t *);
     127         173 :     s = format (s, "%U", format_bier_hdr_proto, t->pproto);
     128             : 
     129         173 :     return (s);
     130             : }
     131             : 
     132        2242 : VLIB_NODE_FN (bier_disp_dispatch_node) (vlib_main_t * vm,
     133             :                   vlib_node_runtime_t * node,
     134             :                   vlib_frame_t * frame)
     135             : {
     136           6 :     return (bier_disp_dispatch_inline(vm, node, frame));
     137             : }
     138             : 
     139      178120 : VLIB_REGISTER_NODE (bier_disp_dispatch_node) = {
     140             :     .name = "bier-disp-dispatch",
     141             :     .vector_size = sizeof (u32),
     142             : 
     143             :     .format_trace = format_bier_disp_dispatch_trace,
     144             :     .n_next_nodes = 1,
     145             :     .next_nodes = {
     146             :         [0] = "bier-drop",
     147             :     }
     148             : };