2 * feat_bitmap.c: bitmap for managing feature invocation
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:
9 * http://www.apache.org/licenses/LICENSE-2.0
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.
18 #include <vlib/vlib.h>
19 #include <vnet/vnet.h>
20 #include <vnet/ethernet/ethernet.h>
21 #include <vnet/ethernet/packet.h>
23 #include <vnet/l2/l2_input.h>
24 #include <vnet/l2/feat_bitmap.h>
26 #include <vppinfra/error.h>
27 #include <vppinfra/hash.h>
28 #include <vppinfra/cache.h>
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.
39 static vlib_node_registration_t feat_bitmap_drop_node;
41 #define foreach_feat_bitmap_drop_error \
42 _(NO_FWD, "L2 feature forwarding disabled") \
43 _(NYI, "L2 feature not implemented")
47 #define _(sym,str) FEAT_BITMAP_DROP_ERROR_##sym,
48 foreach_feat_bitmap_drop_error
50 FEAT_BITMAP_DROP_N_ERROR,
51 } feat_bitmap_drop_error_t;
53 static char *feat_bitmap_drop_error_strings[] = {
54 #define _(sym,string) string,
55 foreach_feat_bitmap_drop_error
61 FEAT_BITMAP_DROP_NEXT_DROP,
62 FEAT_BITMAP_DROP_N_NEXT,
63 } feat_bitmap_drop_next_t;
68 } feat_bitmap_drop_trace_t;
70 /* packet trace format function */
72 format_feat_bitmap_drop_trace (u8 * s, va_list * args)
74 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
75 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
76 feat_bitmap_drop_trace_t *t = va_arg (*args, feat_bitmap_drop_trace_t *);
79 format (s, "feat_bitmap_drop: feature bitmap 0x%08x", t->feature_bitmap);
84 feat_bitmap_drop_node_fn (vlib_main_t * vm,
85 vlib_node_runtime_t * node, vlib_frame_t * frame)
87 u32 n_left_from, *from, *to_next;
88 feat_bitmap_drop_next_t next_index;
90 from = vlib_frame_vector_args (frame);
91 n_left_from = frame->n_vectors; /* number of packets to process */
92 next_index = node->cached_next_index;
94 while (n_left_from > 0)
98 /* get space to enqueue frame to graph node "next_index" */
99 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
101 while (n_left_from > 0 && n_left_to_next > 0)
107 /* speculatively enqueue b0 to the current next frame */
115 b0 = vlib_get_buffer (vm, bi0);
117 if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
118 && (b0->flags & VLIB_BUFFER_IS_TRACED)))
120 feat_bitmap_drop_trace_t *t =
121 vlib_add_trace (vm, node, b0, sizeof (*t));
122 t->feature_bitmap = vnet_buffer (b0)->l2.feature_bitmap;
125 if (vnet_buffer (b0)->l2.feature_bitmap == 1)
128 * If we are executing the last feature, this is the
129 * No forwarding catch-all
131 b0->error = node->errors[FEAT_BITMAP_DROP_ERROR_NO_FWD];
135 b0->error = node->errors[FEAT_BITMAP_DROP_ERROR_NYI];
137 next0 = FEAT_BITMAP_DROP_NEXT_DROP;
139 /* verify speculative enqueue, maybe switch current next frame */
140 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
141 to_next, n_left_to_next,
145 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
147 return frame->n_vectors;
151 feat_bitmap_drop_init (vlib_main_t * vm)
156 VLIB_INIT_FUNCTION (feat_bitmap_drop_init);
158 VLIB_REGISTER_NODE (feat_bitmap_drop_node,static) = {
159 .function = feat_bitmap_drop_node_fn,
160 .name = "feature-bitmap-drop",
161 .vector_size = sizeof (u32),
162 .format_trace = format_feat_bitmap_drop_trace,
163 .type = VLIB_NODE_TYPE_INTERNAL,
165 .n_errors = ARRAY_LEN(feat_bitmap_drop_error_strings),
166 .error_strings = feat_bitmap_drop_error_strings,
168 .n_next_nodes = FEAT_BITMAP_DROP_N_NEXT,
170 /* edit / add dispositions here */
172 [FEAT_BITMAP_DROP_NEXT_DROP] = "error-drop",
177 * fd.io coding-style-patch-verification: ON
180 * eval: (c-set-style "gnu")