aboutsummaryrefslogtreecommitdiffstats
path: root/hicn-plugin/src/strategies/strategy_mw.c
blob: fc7ef47fc40d802efff17146b2dfce41e51bd6c7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
/*
 * 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);

  u8 next_hop_index = 0;
  for (int i = 0; i < HICN_PARAM_FIB_ENTRY_NHOPS_MAX; 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_MW_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_ERROR_DROP] = "error-drop",
  },
};
/* *INDENT-ON* */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */