aboutsummaryrefslogtreecommitdiffstats
path: root/hicn-plugin/src/strategy_node.c
blob: 565f3e4968251553746d9c63bb1e6a439bc78b77 (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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
/*
 * Copyright (c) 2021 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 "hicn.h"
#include "parser.h"
#include "strategy.h"
#include "strategy_dpo_ctx.h"
#include "infra.h"
#include "mgmt.h"
#include "pcs.h"
#include "state.h"
#include "data_fwd.h"
#include "strategies/strategy_mw.h"

/* Registration struct for a graph node */
vlib_node_registration_t hicn_strategy_node;

/*
 * Node context data (to be used in all the strategy nodes); we think this is
 * per-thread/instance
 */
typedef struct hicn_strategy_runtime_s
{
  int id;
  hicn_pit_cs_t *pitcs;
} hicn_strategy_runtime_t;

/* Stats string values */
static char *hicn_strategy_error_strings[] = {
#define _(sym, string) string,
  foreach_hicnfwd_error
#undef _
};

/* packet trace format function */
u8 *
hicn_strategy_format_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 *);
  hicn_strategy_trace_t *t = va_arg (*args, hicn_strategy_trace_t *);

  const hicn_strategy_vft_t *vft = hicn_dpo_get_strategy_vft (t->dpo_type);

  return vft->hicn_format_strategy_trace (s, t);
}

always_inline void
drop_packet (vlib_main_t *vm, u32 bi0, u32 *n_left_to_next, u32 *next0,
	     u32 **to_next, u32 *next_index, vlib_node_runtime_t *node)
{
  *next0 = HICN_STRATEGY_NEXT_ERROR_DROP;

  (*to_next)[0] = bi0;
  *to_next += 1;
  *n_left_to_next -= 1;

  vlib_validate_buffer_enqueue_x1 (vm, node, *next_index, *to_next,
				   *n_left_to_next, bi0, *next0);
}

/*
 * ICN strategy later node for interests: - 1 packet at a time - ipv4/tcp
 * ipv6/tcp
 */
uword
hicn_strategy_fn (vlib_main_t *vm, vlib_node_runtime_t *node,
		  vlib_frame_t *frame)
{

  int ret;
  u32 n_left_from, *from, *to_next, n_left_to_next;
  hicn_strategy_next_t next_index;
  hicn_strategy_runtime_t *rt = NULL;
  vl_api_hicn_api_node_stats_get_reply_t stats = { 0 };
  f64 tnow;
  vlib_buffer_t *b0;
  u32 bi0;
  hicn_face_id_t outfaces[MAX_OUT_FACES];
  u32 clones[MAX_OUT_FACES];
  u16 outfaces_len;
  u32 next0;
  const hicn_dpo_ctx_t *dpo_ctx;
  const hicn_strategy_vft_t *strategy;
  hicn_buffer_t *hicnb0;
  hicn_pcs_entry_t *pcs_entry = NULL;

  from = vlib_frame_vector_args (frame);
  n_left_from = frame->n_vectors;
  next_index = (hicn_strategy_next_t) node->cached_next_index;
  rt = vlib_node_get_runtime_data (vm, hicn_strategy_node.index);
  rt->pitcs = &hicn_main.pitcs;
  /* Capture time in vpp terms */
  tnow = vlib_time_now (vm);
  next0 = next_index;

  while (n_left_from > 0)
    {

      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
      while (n_left_from > 0 && n_left_to_next > 0)
	{
	  // Prefetch for next iteration
	  if (n_left_from > 1)
	    {
	      vlib_buffer_t *b1;
	      b1 = vlib_get_buffer (vm, from[1]);
	      CLIB_PREFETCH (b1, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
	    }

	  // Dequeue a packet buffer
	  bi0 = from[0];
	  from += 1;
	  n_left_from -= 1;
	  b0 = vlib_get_buffer (vm, bi0);

	  // Drop by default
	  next0 = HICN_STRATEGY_NEXT_ERROR_DROP;

	  // Increment counters
	  stats.pkts_processed++;

	  hicnb0 = hicn_get_buffer (b0);

	  // Get the strategy VFT
	  hicnb0->dpo_ctx_id = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
	  dpo_ctx = hicn_strategy_dpo_ctx_get (hicnb0->dpo_ctx_id);
	  hicnb0->vft_id = dpo_ctx->dpo_type;
	  strategy = hicn_dpo_get_strategy_vft (hicnb0->vft_id);
	  strategy->hicn_add_interest (hicnb0->dpo_ctx_id);

	  // Check we have at least one next hop for the packet
	  ret = strategy->hicn_select_next_hop (hicnb0->dpo_ctx_id, outfaces,
						&outfaces_len);

	  if (PREDICT_FALSE (ret != HICN_ERROR_NONE || outfaces_len == 0))
	    {
	      drop_packet (vm, bi0, &n_left_from, &next0, &to_next,
			   &next_index, node);
	      continue;
	    }

	  // Create a new PIT entry
	  pcs_entry = hicn_pcs_entry_pit_get (rt->pitcs, tnow,
					      hicn_buffer_get_lifetime (b0));

	  // Add entry to PIT table
	  ret = hicn_pcs_pit_insert (rt->pitcs, pcs_entry, &hicnb0->name);

	  if (PREDICT_FALSE (ret != HICN_ERROR_NONE))
	    {
	      drop_packet (vm, bi0, &n_left_from, &next0, &to_next,
			   &next_index, node);
	      continue;
	    }

	  // Store internal state
	  ret = hicn_store_internal_state (
	    b0, hicn_pcs_entry_get_index (rt->pitcs, pcs_entry),
	    vnet_buffer (b0)->ip.adj_index[VLIB_TX]);

	  if (PREDICT_FALSE (ret != HICN_ERROR_NONE))
	    {
	      hicn_pcs_entry_remove_lock (rt->pitcs, pcs_entry);
	      drop_packet (vm, bi0, &n_left_from, &next0, &to_next,
			   &next_index, node);
	      continue;
	    }

	  // Add face
	  hicn_pcs_entry_pit_add_face (pcs_entry, hicnb0->face_id);

	  // Set next node
	  next0 = hicn_buffer_is_v6 (b0) ? HICN_STRATEGY_NEXT_INTEREST_FACE6 :
						 HICN_STRATEGY_NEXT_INTEREST_FACE4;

	  if (PREDICT_TRUE (ret == HICN_ERROR_NONE))
	    {
	      // Clone interest if needed
	      if (outfaces_len > 1)
		{
		  ret = vlib_buffer_clone (vm, bi0, clones, (u16) outfaces_len,
					   CLIB_CACHE_LINE_BYTES * 2);
		  ASSERT (ret == outfaces_len);
		}
	      else
		{
		  clones[0] = bi0;
		}

	      // Send interest to next hops
	      for (u32 nh = 0; nh < outfaces_len; nh++)
		{
		  vlib_buffer_t *local_b0 = vlib_get_buffer (vm, clones[nh]);

		  to_next[0] = clones[nh];
		  to_next += 1;
		  n_left_to_next -= 1;

		  vnet_buffer (local_b0)->ip.adj_index[VLIB_TX] = outfaces[nh];
		  stats.pkts_interest_count++;

		  // Maybe trace
		  if (PREDICT_FALSE (
			(node->flags & VLIB_NODE_FLAG_TRACE) &&
			(local_b0->flags & VLIB_BUFFER_IS_TRACED)))
		    {
		      hicn_strategy_trace_t *t =
			vlib_add_trace (vm, node, local_b0, sizeof (*t));
		      t->pkt_type = HICN_PACKET_TYPE_DATA;
		      t->sw_if_index =
			vnet_buffer (local_b0)->sw_if_index[VLIB_RX];
		      t->next_index = next0;
		      t->dpo_type = hicnb0->vft_id;
		    }

		  /*
		   * Fix in case of a wrong speculation. Needed for
		   * cloning the data in the right frame
		   */
		  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
						   to_next, n_left_to_next,
						   clones[nh], next0);
		}
	    }
	  else
	    {
	      drop_packet (vm, bi0, &n_left_from, &next0, &to_next,
			   &next_index, node);
	    }
	}

      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }

  vlib_node_increment_counter (vm, hicn_strategy_node.index,
			       HICNFWD_ERROR_PROCESSED, stats.pkts_processed);
  vlib_node_increment_counter (vm, hicn_strategy_node.index,
			       HICNFWD_ERROR_INTERESTS,
			       stats.pkts_interest_count);

  return (frame->n_vectors);
}

/*
 * Node registration for the forwarder node
 */
VLIB_REGISTER_NODE (hicn_strategy_node) =
  {
   .name = "hicn-strategy",
   .function = hicn_strategy_fn,
   .vector_size = sizeof (u32),
   .runtime_data_bytes = sizeof (int) + sizeof(hicn_pit_cs_t *),
   .format_trace = hicn_strategy_format_trace,
   .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_INTEREST_FACE4] = "hicn4-face-output",
    [HICN_STRATEGY_NEXT_INTEREST_FACE6] = "hicn6-face-output",
    [HICN_STRATEGY_NEXT_ERROR_DROP] = "error-drop",
   },
  };

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