Line data Source code
1 : /*
2 : * feat_bitmap.c: bitmap for managing feature invocation
3 : *
4 : * Copyright (c) 2013 Cisco and/or its affiliates.
5 : * Licensed under the Apache License, Version 2.0 (the "License");
6 : * you may not use this file except in compliance with the License.
7 : * You may obtain a copy of the License at:
8 : *
9 : * http://www.apache.org/licenses/LICENSE-2.0
10 : *
11 : * Unless required by applicable law or agreed to in writing, software
12 : * distributed under the License is distributed on an "AS IS" BASIS,
13 : * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 : * See the License for the specific language governing permissions and
15 : * limitations under the License.
16 : */
17 :
18 : #include <vlib/vlib.h>
19 : #include <vnet/vnet.h>
20 : #include <vnet/ethernet/ethernet.h>
21 : #include <vnet/ethernet/packet.h>
22 : #include <vlib/cli.h>
23 : #include <vnet/l2/l2_input.h>
24 : #include <vnet/l2/feat_bitmap.h>
25 :
26 : #include <vppinfra/error.h>
27 : #include <vppinfra/hash.h>
28 : #include <vppinfra/cache.h>
29 :
30 :
31 : /*
32 : * Drop node for feature bitmaps
33 : * For features that just do a drop, or are not yet implemented.
34 : * Initial feature dispatch nodes don't need to set b0->error
35 : * in case of a possible drop because that will be done here.
36 : *The next node is always error-drop.
37 : */
38 :
39 : static vlib_node_registration_t feat_bitmap_drop_node;
40 :
41 : #define foreach_feat_bitmap_drop_error \
42 : _(NO_FWD, "L2 feature forwarding disabled") \
43 : _(NYI, "L2 feature not implemented")
44 :
45 : typedef enum
46 : {
47 : #define _(sym,str) FEAT_BITMAP_DROP_ERROR_##sym,
48 : foreach_feat_bitmap_drop_error
49 : #undef _
50 : FEAT_BITMAP_DROP_N_ERROR,
51 : } feat_bitmap_drop_error_t;
52 :
53 : static char *feat_bitmap_drop_error_strings[] = {
54 : #define _(sym,string) string,
55 : foreach_feat_bitmap_drop_error
56 : #undef _
57 : };
58 :
59 : typedef enum
60 : {
61 : FEAT_BITMAP_DROP_NEXT_DROP,
62 : FEAT_BITMAP_DROP_N_NEXT,
63 : } feat_bitmap_drop_next_t;
64 :
65 : typedef struct
66 : {
67 : u32 feature_bitmap;
68 : } feat_bitmap_drop_trace_t;
69 :
70 : /* packet trace format function */
71 : static u8 *
72 57 : format_feat_bitmap_drop_trace (u8 * s, va_list * args)
73 : {
74 57 : CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
75 57 : CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
76 57 : feat_bitmap_drop_trace_t *t = va_arg (*args, feat_bitmap_drop_trace_t *);
77 :
78 : s =
79 57 : format (s, "feat_bitmap_drop: feature bitmap 0x%08x", t->feature_bitmap);
80 57 : return s;
81 : }
82 :
83 : static uword
84 9 : feat_bitmap_drop_node_fn (vlib_main_t * vm,
85 : vlib_node_runtime_t * node, vlib_frame_t * frame)
86 : {
87 : u32 n_left_from, *from, *to_next;
88 : feat_bitmap_drop_next_t next_index;
89 :
90 9 : from = vlib_frame_vector_args (frame);
91 9 : n_left_from = frame->n_vectors; /* number of packets to process */
92 9 : next_index = node->cached_next_index;
93 :
94 18 : while (n_left_from > 0)
95 : {
96 : u32 n_left_to_next;
97 :
98 : /* get space to enqueue frame to graph node "next_index" */
99 9 : vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
100 :
101 66 : while (n_left_from > 0 && n_left_to_next > 0)
102 : {
103 : u32 bi0;
104 : vlib_buffer_t *b0;
105 : u32 next0;
106 :
107 : /* speculatively enqueue b0 to the current next frame */
108 57 : bi0 = from[0];
109 57 : to_next[0] = bi0;
110 57 : from += 1;
111 57 : to_next += 1;
112 57 : n_left_from -= 1;
113 57 : n_left_to_next -= 1;
114 :
115 57 : b0 = vlib_get_buffer (vm, bi0);
116 :
117 57 : if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
118 : && (b0->flags & VLIB_BUFFER_IS_TRACED)))
119 : {
120 : feat_bitmap_drop_trace_t *t =
121 57 : vlib_add_trace (vm, node, b0, sizeof (*t));
122 57 : t->feature_bitmap = vnet_buffer (b0)->l2.feature_bitmap;
123 : }
124 :
125 57 : if (vnet_buffer (b0)->l2.feature_bitmap == 1)
126 : {
127 : /*
128 : * If we are executing the last feature, this is the
129 : * No forwarding catch-all
130 : */
131 57 : b0->error = node->errors[FEAT_BITMAP_DROP_ERROR_NO_FWD];
132 : }
133 : else
134 : {
135 0 : b0->error = node->errors[FEAT_BITMAP_DROP_ERROR_NYI];
136 : }
137 57 : next0 = FEAT_BITMAP_DROP_NEXT_DROP;
138 :
139 : /* verify speculative enqueue, maybe switch current next frame */
140 57 : vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
141 : to_next, n_left_to_next,
142 : bi0, next0);
143 : }
144 :
145 9 : vlib_put_next_frame (vm, node, next_index, n_left_to_next);
146 : }
147 9 : return frame->n_vectors;
148 : }
149 :
150 : clib_error_t *
151 559 : feat_bitmap_drop_init (vlib_main_t * vm)
152 : {
153 559 : return 0;
154 : }
155 :
156 14559 : VLIB_INIT_FUNCTION (feat_bitmap_drop_init);
157 :
158 : /* *INDENT-OFF* */
159 178120 : VLIB_REGISTER_NODE (feat_bitmap_drop_node,static) = {
160 : .function = feat_bitmap_drop_node_fn,
161 : .name = "feature-bitmap-drop",
162 : .vector_size = sizeof (u32),
163 : .format_trace = format_feat_bitmap_drop_trace,
164 : .type = VLIB_NODE_TYPE_INTERNAL,
165 :
166 : .n_errors = ARRAY_LEN(feat_bitmap_drop_error_strings),
167 : .error_strings = feat_bitmap_drop_error_strings,
168 :
169 : .n_next_nodes = FEAT_BITMAP_DROP_N_NEXT,
170 :
171 : /* edit / add dispositions here */
172 : .next_nodes = {
173 : [FEAT_BITMAP_DROP_NEXT_DROP] = "error-drop",
174 : },
175 : };
176 : /* *INDENT-ON* */
177 :
178 : /*
179 : * fd.io coding-style-patch-verification: ON
180 : *
181 : * Local Variables:
182 : * eval: (c-set-style "gnu")
183 : * End:
184 : */
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