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/*
* Copyright (c) 2017-2019 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 <vlib/vlib.h>
#include <vnet/vnet.h>
#include "../strategy.h"
#include "../strategy_dpo_ctx.h"
#include "dpo_mw.h"
#include "../faces/face.h"
#include "../route.h"
#include "../pcs.h"
#include "../strategy_dpo_manager.h"
/* Simple strategy that chooses the next hop with the maximum weight */
/* It does not require to exend the hicn_dpo */
void hicn_receive_data_mw (index_t dpo_idx, int nh_idx);
void hicn_add_interest_mw (index_t dpo_idx, hicn_hash_entry_t * pit_entry);
void hicn_on_interest_timeout_mw (index_t dpo_idx);
u32 hicn_select_next_hop_mw (index_t dpo_idx, int *nh_idx,
dpo_id_t ** outface);
u32 get_strategy_node_index_mw (void);
static hicn_strategy_vft_t hicn_strategy_mw_vft = {
.hicn_receive_data = &hicn_receive_data_mw,
.hicn_add_interest = &hicn_add_interest_mw,
.hicn_on_interest_timeout = &hicn_on_interest_timeout_mw,
.hicn_select_next_hop = &hicn_select_next_hop_mw,
.get_strategy_node_index = get_strategy_node_index_mw
};
/* Stats string values */
static char *hicn_strategy_error_strings[] = {
#define _(sym, string) string,
foreach_hicnfwd_error
#undef _
};
/*
* Return the vft of the strategy.
*/
hicn_strategy_vft_t *
hicn_mw_strategy_get_vft (void)
{
return &hicn_strategy_mw_vft;
}
/* Registration struct for a graph node */
vlib_node_registration_t hicn_mw_strategy_node;
u32
get_strategy_node_index_mw (void)
{
return hicn_mw_strategy_node.index;
}
/* DPO should be give in input as it containes all the information to calculate the next hops*/
u32
hicn_select_next_hop_mw (index_t dpo_idx, int *nh_idx, dpo_id_t ** outface)
{
hicn_strategy_mw_ctx_t *hicn_strategy_mw_ctx =
(hicn_strategy_mw_ctx_t *) hicn_strategy_mw_ctx_get (dpo_idx);
if(hicn_strategy_mw_ctx == NULL)
return HICN_ERROR_STRATEGY_NOT_FOUND;
u8 next_hop_index = 0;
for (int i = 0; i < hicn_strategy_mw_ctx->default_ctx.entry_count; i++)
{
if (dpo_id_is_valid (&hicn_strategy_mw_ctx->default_ctx.next_hops[i]))
{
if (hicn_strategy_mw_ctx->weight[next_hop_index] <
hicn_strategy_mw_ctx->weight[i])
{
next_hop_index = i;
}
}
}
if (!dpo_id_is_valid
(&hicn_strategy_mw_ctx->default_ctx.next_hops[next_hop_index]))
return HICN_ERROR_STRATEGY_NH_NOT_FOUND;
*outface =
(dpo_id_t *) & hicn_strategy_mw_ctx->default_ctx.
next_hops[next_hop_index];
return HICN_ERROR_NONE;
}
uword
hicn_mw_strategy_node_fn (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return hicn_forward_interest_fn (vm, node, frame, &hicn_strategy_mw_vft,
hicn_dpo_strategy_mw_get_type (),
&hicn_mw_strategy_node);
}
void
hicn_add_interest_mw (index_t dpo_ctx_idx, hicn_hash_entry_t * hash_entry)
{
hash_entry->dpo_ctx_id = dpo_ctx_idx;
dpo_id_t hicn_dpo_id =
{ hicn_dpo_strategy_mw_get_type (), 0, 0, dpo_ctx_idx };
hicn_strategy_mw_ctx_lock (&hicn_dpo_id);
hash_entry->vft_id = hicn_dpo_get_vft_id (&hicn_dpo_id);
}
void
hicn_on_interest_timeout_mw (index_t dpo_idx)
{
/* Nothign to do in the mw strategy when we receive an interest */
}
void
hicn_receive_data_mw (index_t dpo_idx, int nh_idx)
{
}
/* packet trace format function */
static u8 *
hicn_strategy_format_trace_mw (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 *);
hicn_strategy_trace_t *t = va_arg (*args, hicn_strategy_trace_t *);
s = format (s, "Strategy_mw: pkt: %d, sw_if_index %d, next index %d",
(int) t->pkt_type, t->sw_if_index, t->next_index);
return (s);
}
/*
* Node registration for the forwarder node
*/
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (hicn_mw_strategy_node) =
{
.name = "hicn-mw-strategy",
.function = hicn_mw_strategy_node_fn,
.vector_size = sizeof (u32),
.runtime_data_bytes = sizeof (int) + sizeof(hicn_pit_cs_t *),
.format_trace = hicn_strategy_format_trace_mw,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN (hicn_strategy_error_strings),
.error_strings = hicn_strategy_error_strings,
.n_next_nodes = HICN_STRATEGY_N_NEXT,
.next_nodes = {
[HICN_STRATEGY_NEXT_INTEREST_HITPIT] = "hicn-interest-hitpit",
[HICN_STRATEGY_NEXT_INTEREST_HITCS] = "hicn-interest-hitcs",
[HICN_STRATEGY_NEXT_ERROR_DROP] = "error-drop",
[HICN_STRATEGY_NEXT_EMPTY] = "ip4-lookup",
},
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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