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