aboutsummaryrefslogtreecommitdiffstats
path: root/hicn-plugin/src/data_fwd.h
blob: c001e5af5547c1a7fd46f2a044d6cf8fa73f943d (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
/*
 * 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.
 */

#ifndef __HICN_DATA_FWD_H__
#define __HICN_DATA_FWD_H__

#include <vlib/buffer.h>

#include "pcs.h"

/* Trace context struct */
typedef struct
{
  u32 next_index;
  u32 sw_if_index;
  u8 pkt_type;
  u8 packet_data[64];
} hicn_data_fwd_trace_t;

typedef enum
{
  HICN_DATA_FWD_NEXT_V4_LOOKUP,
  HICN_DATA_FWD_NEXT_V6_LOOKUP,
  HICN_DATA_FWD_NEXT_PUSH,
  HICN_DATA_FWD_NEXT_ERROR_DROP,
  HICN_DATA_FWD_N_NEXT,
} hicn_data_fwd_next_t;

/**
 *@brief Create a maximum of 256 clones of buffer and store them
 *   in the supplied array. Unlike the original function in the vlib
 *   library, we don't prevent cloning if n_buffer==1 and if
 *   s->current_length <= head_end_offset + CLIB_CACHE_LINE_BYTES * 2.
 *
 * @param vm - (vlib_main_t *) vlib main data structure pointer
 * @param src_buffer - (u32) source buffer index
 * @param buffers - (u32 * ) buffer index array
 * @param n_buffers - (u16) number of buffer clones requested (<=256)
 * @param head_end_offset - (u16) offset relative to current position
 *          where packet head ends
 * @return - (u16) number of buffers actually cloned, may be
 *   less than the number requested or zero
 */
always_inline u16
vlib_buffer_clone_256_2 (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
			 u16 n_buffers, u16 head_end_offset)
{
  u16 i;
  vlib_buffer_t *s = vlib_get_buffer (vm, src_buffer);

  ASSERT (n_buffers);
  ASSERT (n_buffers <= 256);

  if (s->current_length <= head_end_offset + CLIB_CACHE_LINE_BYTES * 2)
    {
      for (i = 0; i < n_buffers; i++)
	{
	  vlib_buffer_t *d;
	  d = vlib_buffer_copy (vm, s);
	  if (d == 0)
	    return i;
	  buffers[i] = vlib_get_buffer_index (vm, d);
	}
      return n_buffers;
    }
  n_buffers = vlib_buffer_alloc_from_pool (vm, buffers, n_buffers,
					   s->buffer_pool_index);

  for (i = 0; i < n_buffers; i++)
    {
      vlib_buffer_t *d = vlib_get_buffer (vm, buffers[i]);
      d->current_data = s->current_data;
      d->current_length = head_end_offset;
      d->trace_index = s->trace_index;

      d->total_length_not_including_first_buffer = s->current_length -
	head_end_offset;
      if (PREDICT_FALSE (s->flags & VLIB_BUFFER_NEXT_PRESENT))
	{
	  d->total_length_not_including_first_buffer +=
	    s->total_length_not_including_first_buffer;
	}
      d->flags = s->flags | VLIB_BUFFER_NEXT_PRESENT;
      d->flags &= ~VLIB_BUFFER_EXT_HDR_VALID;
      d->trace_index = s->trace_index;
      clib_memcpy_fast (d->opaque, s->opaque, sizeof (s->opaque));
      clib_memcpy_fast (d->opaque2, s->opaque2, sizeof (s->opaque2));
      clib_memcpy_fast (vlib_buffer_get_current (d),
			vlib_buffer_get_current (s), head_end_offset);
      d->next_buffer = src_buffer;
    }
  vlib_buffer_advance (s, head_end_offset);
  s->ref_count = n_buffers;
  while (s->flags & VLIB_BUFFER_NEXT_PRESENT)
    {
      s = vlib_get_buffer (vm, s->next_buffer);
      s->ref_count = n_buffers;
    }

  return n_buffers;
}

/**
 * @brief Create multiple clones of buffer and store them
 *  in the supplied array. Unlike the function in the vlib library,
 *   we allow src_buffer to have ref_count != 0.
 *
 * @param vm - (vlib_main_t *) vlib main data structure pointer
 * @param src_buffer - (u32) source buffer index
 * @param buffers - (u32 * ) buffer index array
 * @param n_buffers - (u16) number of buffer clones requested (<=256)
 * @param head_end_offset - (u16) offset relative to current position
 *   where packet head ends
 * @return - (u16) number of buffers actually cloned, may be
 *   less than the number requested or zero
 */
always_inline u16
vlib_buffer_clone2 (vlib_main_t * vm, u32 src_buffer, u32 * buffers,
		    u16 n_buffers, u16 head_end_offset)
{
  vlib_buffer_t *s = vlib_get_buffer (vm, src_buffer);

  /*
   * total_length_not_including_first_buffer is not initialized to 0
   * when a buffer is used.
   */
  if (PREDICT_TRUE (s->next_buffer == 0))
    s->total_length_not_including_first_buffer = 0;

  u16 n_cloned = 0;
  u8 n_clone_src = 255 - s->ref_count;

  /*
   * We need to copy src for all the clones that cannot be chained in
   * the src_buffer
   */
  /* MAX(ref_count) = 256 */
  if (n_buffers > n_clone_src)
    {
      vlib_buffer_t *copy;
      /* Ok to call the original vlib_buffer_copy. */
      copy = vlib_buffer_copy (vm, s);
      n_cloned += vlib_buffer_clone (vm,
				     vlib_get_buffer_index (vm, copy),
				     buffers,
				     n_buffers - n_clone_src,
				     head_end_offset);
      n_buffers -= n_cloned;
    }
  /*
   * vlib_buffer_clone_256 check if ref_count is 0. We force it to be
   * 0 before calling the function and we retore it to the right value
   * after the function has been called
   */
  u8 tmp_ref_count = s->ref_count;

  s->ref_count = 1;
  /*
   * The regular vlib_buffer_clone_256 does copy if we need to clone
   * only one packet. While this is not a problem per se, it adds
   * complexity to the code, especially because we need to add 1 to
   * ref_count when the packet is cloned.
   */
  n_cloned += vlib_buffer_clone_256_2 (vm,
				       src_buffer,
				       (buffers + n_cloned),
				       n_buffers, head_end_offset);

  s->ref_count += (tmp_ref_count - 1);

  return n_cloned;
}

#endif /* //__HICN_DATA_FWD_H__ */

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