summaryrefslogtreecommitdiffstats
path: root/hicn-plugin/src/interest_hitcs_node.c
blob: 651b2796a5641fcb6ffc96d4f376585f17eb75c9 (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
/*
 * 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 <vnet/ip/ip6_packet.h>
#include <vppinfra/string.h>

#include "interest_hitcs.h"
#include "mgmt.h"
#include "parser.h"
#include "data_fwd.h"
#include "infra.h"
#include "state.h"
#include "error.h"

/* packet trace format function */
static u8 *hicn_interest_hitcs_format_trace (u8 *s, va_list *args);

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

vlib_node_registration_t hicn_interest_hitcs_node;

// always_inline void drop_packet (u32 *next0);

always_inline u32
clone_from_cs (vlib_main_t *vm, u32 bi0_cs, vlib_buffer_t *dest, u8 isv6)
{
  /* Retrieve the buffer to clone */
  u32 ret = bi0_cs;
  vlib_buffer_t *cs_buf = vlib_get_buffer (vm, bi0_cs);
  hicn_buffer_t *hicnb = hicn_get_buffer (cs_buf);
  word buffer_advance = CLIB_CACHE_LINE_BYTES * 2;
  if (hicnb->flags & HICN_BUFFER_FLAGS_PKT_LESS_TWO_CL)
    {
      clib_memcpy_fast (vlib_buffer_get_current (dest),
			vlib_buffer_get_current (cs_buf),
			cs_buf->current_length);
      clib_memcpy_fast (dest->opaque2, cs_buf->opaque2,
			sizeof (cs_buf->opaque2));

      dest->current_length = cs_buf->current_length;
      dest->total_length_not_including_first_buffer = 0;
    }
  else
    {
      vlib_buffer_advance (cs_buf, -buffer_advance);
      if (PREDICT_FALSE (cs_buf->ref_count == 255))
	{
	  vlib_buffer_t *cs_buf2 = vlib_buffer_copy (vm, cs_buf);
	  vlib_buffer_advance (cs_buf, buffer_advance);
	  ret = vlib_get_buffer_index (vm, cs_buf2);
	  cs_buf->ref_count--;
	  cs_buf = cs_buf2;
	}

      clib_memcpy_fast (vlib_buffer_get_current (dest),
			vlib_buffer_get_current (cs_buf), buffer_advance);
      clib_memcpy_fast (dest->opaque2, cs_buf->opaque2,
			sizeof (cs_buf->opaque2));
      dest->current_length = buffer_advance;
      vlib_buffer_advance (cs_buf, buffer_advance);
      vlib_buffer_attach_clone (vm, dest, cs_buf);
    }

  /* Set fag for packet coming from CS */
  hicn_get_buffer (dest)->flags |= HICN_BUFFER_FLAGS_FROM_CS;

  return ret;
}

static uword
hicn_interest_hitcs_node_fn (vlib_main_t *vm, vlib_node_runtime_t *node,
			     vlib_frame_t *frame)
{
  u32 n_left_from, *from, *to_next;
  hicn_interest_hitcs_next_t next_index;
  hicn_interest_hitcs_runtime_t *rt;
  vl_api_hicn_api_node_stats_get_reply_t stats = { 0 };
  vlib_buffer_t *b0;
  u8 isv6;
  u32 bi0, bi_ret;
  u32 next0 = HICN_INTEREST_HITCS_NEXT_ERROR_DROP;
  hicn_buffer_t *hicnb0;
  u32 pcs_entry_index;
  hicn_pcs_entry_t *pcs_entry = NULL;
  const hicn_strategy_vft_t *strategy_vft0;
  const hicn_dpo_vft_t *dpo_vft0;
  u8 dpo_ctx_id0;
  f64 tnow;

  rt = vlib_node_get_runtime_data (vm, hicn_interest_hitcs_node.index);

  if (PREDICT_FALSE (rt->pitcs == NULL))
    {
      rt->pitcs = &hicn_main.pitcs;
    }
  from = vlib_frame_vector_args (frame);
  n_left_from = frame->n_vectors;
  next_index = node->cached_next_index;

  /* Capture time in vpp terms */
  tnow = vlib_time_now (vm);
  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)
	{
	  /* 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, STORE);
	    }

	  /* Dequeue a packet buffer */
	  bi0 = from[0];
	  from += 1;
	  n_left_from -= 1;
	  to_next[0] = bi0;
	  to_next += 1;
	  n_left_to_next -= 1;

	  b0 = vlib_get_buffer (vm, bi0);

	  /* Get hicn buffer and state */
	  hicnb0 = hicn_get_buffer (b0);
	  hicn_get_internal_state (hicnb0, &pcs_entry_index, &strategy_vft0,
				   &dpo_vft0, &dpo_ctx_id0);
	  pcs_entry =
	    hicn_pcs_entry_get_entry_from_index (rt->pitcs, pcs_entry_index);

	  isv6 = hicn_buffer_is_v6 (b0);

	  if (tnow > hicn_pcs_entry_get_expire_time (pcs_entry))
	    {
	      // Delete and clean up expired CS entry
	      hicn_pcs_entry_remove_lock (rt->pitcs, pcs_entry);

	      // Update stats
	      stats.cs_expired_count++;

	      // Forward interest to the strategy node
	      next0 = HICN_INTEREST_HITCS_NEXT_STRATEGY;
	    }
	  else
	    {
	      // Retrieve the incoming iface and forward
	      // the data through it
	      next0 = isv6 ? HICN_INTEREST_HITCS_NEXT_IFACE6_OUT :
				   HICN_INTEREST_HITCS_NEXT_IFACE4_OUT;
	      vnet_buffer (b0)->ip.adj_index[VLIB_TX] = hicnb0->face_id;

	      bi_ret = clone_from_cs (
		vm, hicn_pcs_entry_cs_get_buffer (pcs_entry), b0, isv6);

	      hicn_pcs_entry_cs_set_buffer (pcs_entry, bi_ret);

	      // Update stats
	      stats.pkts_from_cache_count++;
	      stats.pkts_data_count++;
	    }

	  // Maybe trace
	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
			     (b0->flags & VLIB_BUFFER_IS_TRACED)))
	    {
	      hicn_interest_hitcs_trace_t *t =
		vlib_add_trace (vm, node, b0, sizeof (*t));
	      t->pkt_type = HICN_PACKET_TYPE_INTEREST;
	      t->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX];
	      t->next_index = next0;
	    }

	  // Increment packet counter
	  stats.pkts_processed += 1;

	  // Verify speculative enqueue, maybe switch current next frame
	  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);
    }

  u32 pit_int_count = hicn_pcs_get_pit_count (rt->pitcs);

  vlib_node_increment_counter (vm, hicn_interest_hitcs_node.index,
			       HICNFWD_ERROR_CACHED,
			       stats.pkts_from_cache_count);

  vlib_node_increment_counter (vm, hicn_interest_hitcs_node.index,
			       HICNFWD_ERROR_DATAS, stats.pkts_data_count);

  update_node_counter (vm, hicn_interest_hitcs_node.index,
		       HICNFWD_ERROR_INT_COUNT, pit_int_count);

  return (frame->n_vectors);
}

#if 0
always_inline void
drop_packet (u32 *next0)
{
  *next0 = HICN_INTEREST_HITCS_NEXT_ERROR_DROP;
}
#endif

/* packet trace format function */
static u8 *
hicn_interest_hitcs_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_interest_hitcs_trace_t *t =
    va_arg (*args, hicn_interest_hitcs_trace_t *);

  s = format (s, "INTEREST-HITCS: 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 interest forwarder node
 */
VLIB_REGISTER_NODE (hicn_interest_hitcs_node) = {
  .function = hicn_interest_hitcs_node_fn,
  .name = "hicn-interest-hitcs",
  .vector_size = sizeof (u32),
  .runtime_data_bytes = sizeof (hicn_interest_hitcs_runtime_t),
  .format_trace = hicn_interest_hitcs_format_trace,
  .type = VLIB_NODE_TYPE_INTERNAL,
  .n_errors = ARRAY_LEN (hicn_interest_hitcs_error_strings),
  .error_strings = hicn_interest_hitcs_error_strings,
  .n_next_nodes = HICN_INTEREST_HITCS_N_NEXT,
  /* edit / add dispositions here */
  .next_nodes = { [HICN_INTEREST_HITCS_NEXT_STRATEGY] = "hicn-strategy",
		  [HICN_INTEREST_HITCS_NEXT_IFACE4_OUT] = "hicn4-iface-output",
		  [HICN_INTEREST_HITCS_NEXT_IFACE6_OUT] = "hicn6-iface-output",
		  [HICN_INTEREST_HITCS_NEXT_ERROR_DROP] = "error-drop" },
};

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