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
|
/*
* feat_bitmap.c: bitmap for managing feature invocation
*
* Copyright (c) 2013 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 <vnet/ethernet/ethernet.h>
#include <vnet/ethernet/packet.h>
#include <vlib/cli.h>
#include <vnet/l2/l2_input.h>
#include <vnet/l2/feat_bitmap.h>
#include <vppinfra/error.h>
#include <vppinfra/hash.h>
#include <vppinfra/cache.h>
/*
* Drop node for feature bitmaps
* For features that just do a drop, or are not yet implemented.
* Initial feature dispatch nodes don't need to set b0->error
* in case of a possible drop because that will be done here.
*The next node is always error-drop.
*/
static vlib_node_registration_t feat_bitmap_drop_node;
#define foreach_feat_bitmap_drop_error \
_(NO_FWD, "L2 feature forwarding disabled") \
_(NYI, "L2 feature not implemented")
typedef enum
{
#define _(sym,str) FEAT_BITMAP_DROP_ERROR_##sym,
foreach_feat_bitmap_drop_error
#undef _
FEAT_BITMAP_DROP_N_ERROR,
} feat_bitmap_drop_error_t;
static char *feat_bitmap_drop_error_strings[] = {
#define _(sym,string) string,
foreach_feat_bitmap_drop_error
#undef _
};
typedef enum
{
FEAT_BITMAP_DROP_NEXT_DROP,
FEAT_BITMAP_DROP_N_NEXT,
} feat_bitmap_drop_next_t;
typedef struct
{
u32 feature_bitmap;
} feat_bitmap_drop_trace_t;
/* packet trace format function */
static u8 *
format_feat_bitmap_drop_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 *);
feat_bitmap_drop_trace_t *t = va_arg (*args, feat_bitmap_drop_trace_t *);
s =
format (s, "feat_bitmap_drop: feature bitmap 0x%08x", t->feature_bitmap);
return s;
}
static uword
feat_bitmap_drop_node_fn (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
u32 n_left_from, *from, *to_next;
feat_bitmap_drop_next_t next_index;
from = vlib_frame_vector_args (frame);
n_left_from = frame->n_vectors; /* number of packets to process */
next_index = node->cached_next_index;
while (n_left_from > 0)
{
u32 n_left_to_next;
/* get space to enqueue frame to graph node "next_index" */
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
vlib_buffer_t *b0;
u32 next0;
/* speculatively enqueue b0 to the current next frame */
bi0 = from[0];
to_next[0] = bi0;
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
b0 = vlib_get_buffer (vm, bi0);
if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
&& (b0->flags & VLIB_BUFFER_IS_TRACED)))
{
feat_bitmap_drop_trace_t *t =
vlib_add_trace (vm, node, b0, sizeof (*t));
t->feature_bitmap = vnet_buffer (b0)->l2.feature_bitmap;
}
if (vnet_buffer (b0)->l2.feature_bitmap == 1)
{
/*
* If we are executing the last feature, this is the
* No forwarding catch-all
*/
b0->error = node->errors[FEAT_BITMAP_DROP_ERROR_NO_FWD];
}
else
{
b0->error = node->errors[FEAT_BITMAP_DROP_ERROR_NYI];
}
next0 = FEAT_BITMAP_DROP_NEXT_DROP;
/* 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);
}
return frame->n_vectors;
}
clib_error_t *
feat_bitmap_drop_init (vlib_main_t * vm)
{
return 0;
}
VLIB_INIT_FUNCTION (feat_bitmap_drop_init);
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (feat_bitmap_drop_node,static) = {
.function = feat_bitmap_drop_node_fn,
.name = "feature-bitmap-drop",
.vector_size = sizeof (u32),
.format_trace = format_feat_bitmap_drop_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(feat_bitmap_drop_error_strings),
.error_strings = feat_bitmap_drop_error_strings,
.n_next_nodes = FEAT_BITMAP_DROP_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[FEAT_BITMAP_DROP_NEXT_DROP] = "error-drop",
},
};
/* *INDENT-ON* */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
