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/*
* Copyright (c) 2016 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <vnet/bier/bier_disp_table.h>
#include <vnet/bier/bier_hdr_inlines.h>
/**
* @brief A struct to hold tracing information for the MPLS label imposition
* node.
*/
typedef struct bier_disp_lookup_trace_t_
{
/**
* BIER source BP used in the lookup - host order
*/
bier_bp_t bp;
/**
* BIER disp table
*/
index_t bdti;
} bier_disp_lookup_trace_t;
/**
* Next nodes from BIER disposition lookup
*/
typedef enum bier_disp_lookup_next_t_
{
BIER_DISP_LOOKUP_NEXT_DROP,
BIER_DISP_LOOKUP_NEXT_DISPATCH,
} bier_disp_lookup_next_t;
#define BIER_DISP_LOOKUP_N_NEXT (BIER_DISP_LOOKUP_NEXT_DISPATCH+1)
always_inline uword
bier_disp_lookup_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
u32 n_left_from, next_index, * from, * to_next;
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
next_index = node->cached_next_index;
while (n_left_from > 0)
{
u32 n_left_to_next;
vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next);
while (n_left_from > 0 && n_left_to_next > 0)
{
const bier_hdr_t *hdr0;
bier_hdr_src_id_t src0;
vlib_buffer_t * b0;
u32 bdei0, bdti0;
u32 next0, bi0;
bi0 = from[0];
to_next[0] = bi0;
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
bdti0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
hdr0 = vlib_buffer_get_current(b0);
/*
* lookup - source is in network order.
*/
src0 = bier_hdr_get_src_id(hdr0);
next0 = BIER_DISP_LOOKUP_NEXT_DISPATCH;
bdei0 = bier_disp_table_lookup(bdti0, src0);
if (PREDICT_FALSE(INDEX_INVALID == bdei0))
{
/*
* if a specific match misses, try the default
*/
bdei0 = bier_disp_table_lookup(bdti0, 0);
if (PREDICT_FALSE(INDEX_INVALID == bdei0))
{
next0 = BIER_DISP_LOOKUP_NEXT_DROP;
}
}
vnet_buffer(b0)->ip.adj_index[VLIB_TX] = bdei0;
if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
{
bier_disp_lookup_trace_t *tr =
vlib_add_trace (vm, node, b0, sizeof (*tr));
tr->bp = clib_net_to_host_u16(bier_hdr_get_src_id(hdr0));
tr->bdti = bdti0;
}
vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next,
n_left_to_next, bi0, next0);
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
return from_frame->n_vectors;
}
static u8 *
format_bier_disp_lookup_trace (u8 * s, va_list * args)
{
CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
bier_disp_lookup_trace_t * t;
t = va_arg (*args, bier_disp_lookup_trace_t *);
s = format (s, "tbl:%d src:%d", t->bdti, t->bp);
return (s);
}
VLIB_NODE_FN (bier_disp_lookup_node) (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return (bier_disp_lookup_inline(vm, node, frame));
}
VLIB_REGISTER_NODE (bier_disp_lookup_node) = {
.name = "bier-disp-lookup",
.vector_size = sizeof (u32),
.format_trace = format_bier_disp_lookup_trace,
.n_next_nodes = BIER_DISP_LOOKUP_N_NEXT,
.next_nodes = {
[BIER_DISP_LOOKUP_NEXT_DROP] = "bier-drop",
[BIER_DISP_LOOKUP_NEXT_DISPATCH] = "bier-disp-dispatch",
}
};
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