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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/buffer.h>
#include <vnet/bier/bier_fmask.h>
#include <vnet/bier/bier_hdr_inlines.h>
#include <vlib/vlib.h>
static char * bier_output_error_strings[] = {
#define bier_error(n,s) s,
#include <vnet/bier/bier_output_error.def>
#undef bier_error
};
/*
* Keep these values sematically the same as BIER output
*/
#define foreach_bier_output_next \
_(DROP, "bier-drop")
typedef enum {
#define _(s,n) BIER_OUTPUT_NEXT_##s,
foreach_bier_output_next
#undef _
BIER_OUTPUT_N_NEXT,
} bier_output_next_t;
typedef enum {
#define bier_error(n,s) BIER_OUTPUT_ERROR_##n,
#include <vnet/bier/bier_output_error.def>
#undef bier_error
BIER_OUTPUT_N_ERROR,
} bier_output_error_t;
/**
* Forward declaration
*/
vlib_node_registration_t bier_output_node;
extern vlib_combined_counter_main_t bier_fmask_counters;
/**
* @brief Packet trace recoed for a BIER output
*/
typedef struct bier_output_trace_t_
{
u32 next_index;
index_t bfm_index;
} bier_output_trace_t;
static uword
bier_output (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * from_frame)
{
vlib_combined_counter_main_t *cm = &bier_fmask_counters;
u32 n_left_from, next_index, * from, * to_next;
u32 thread_index;
thread_index = vlib_get_thread_index ();
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
/*
* objection your honour! speculation!
*/
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)
{
bier_output_next_t next0;
bier_bit_string_t bbs;
vlib_buffer_t * b0;
bier_fmask_t *bfm0;
mpls_label_t *h0;
bier_hdr_t *bh0;
u32 bfmi0;
u32 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);
bh0 = vlib_buffer_get_current (b0);
bier_bit_string_init_from_hdr(bh0, &bbs);
/*
* In the BIER Lookup node we squirelled away the
* BIER fmask index as the adj index
*/
bfmi0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
bfm0 = bier_fmask_get(bfmi0);
vlib_increment_combined_counter(
cm, thread_index, bfmi0, 1,
vlib_buffer_length_in_chain (vm, b0));
/*
* perform the logical AND of the packet's mask with
* that of the fmask objects, to reset the bits that
* are only on the shortest path the the fmask NH.
*/
bier_bit_string_logical_and_string(
&bfm0->bfm_bits.bfmb_input_reset_string,
&bbs);
/*
* this is the last time we touch the BIER header
* so flip to network order
*/
bier_hdr_hton(bh0);
/*
* paint the BIER peer's label
*/
if (!(bfm0->bfm_flags & BIER_FMASK_FLAG_DISP))
{
/*
* since a BIFT value and a MPLS label are formated the
* same, this painting works OK.
*/
vlib_buffer_advance(b0, -(word)sizeof(mpls_label_t));
h0 = vlib_buffer_get_current(b0);
h0[0] = bfm0->bfm_label;
((char*)h0)[3]= vnet_buffer(b0)->mpls.ttl - 1;
}
/*
* setup next graph node
*/
next0 = bfm0->bfm_dpo.dpoi_next_node;
vnet_buffer(b0)->ip.adj_index[VLIB_TX] = bfm0->bfm_dpo.dpoi_index;
if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
{
bier_output_trace_t *tr;
tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
tr->next_index = next0;
tr->bfm_index = bfmi0;
}
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);
}
vlib_node_increment_counter (vm, bier_output_node.index,
BIER_OUTPUT_ERROR_NONE,
from_frame->n_vectors);
return (from_frame->n_vectors);
}
static u8 *
format_bier_output_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_output_trace_t * t = va_arg (*args, bier_output_trace_t *);
s = format (s, " next [%d], BFM index %d",
t->next_index, t->bfm_index);
return s;
}
VLIB_REGISTER_NODE (bier_output_node) = {
.function = bier_output,
.name = "bier-output",
/* Takes a vector of packets. */
.vector_size = sizeof (u32),
.n_errors = BIER_OUTPUT_N_ERROR,
.error_strings = bier_output_error_strings,
.n_next_nodes = BIER_OUTPUT_N_NEXT,
.next_nodes = {
[BIER_OUTPUT_NEXT_DROP] = "bier-drop",
},
.format_trace = format_bier_output_trace,
};
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