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/*
* Copyright (c) 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.
*/
#include <vnet/fib/fib_entry_track.h>
#include <vnet/fib/fib_table.h>
#include <vnet/fib/fib_entry_delegate.h>
#include <vnet/fib/fib_walk.h>
static fib_entry_delegate_t *
fib_entry_track_delegate_add (u32 fib_index,
const fib_prefix_t *prefix)
{
fib_entry_delegate_t *fed;
fib_node_index_t fei;
fei = fib_table_entry_special_add(fib_index,
prefix,
FIB_SOURCE_RR,
FIB_ENTRY_FLAG_NONE);
fed = fib_entry_delegate_find_or_add(fib_entry_get(fei),
FIB_ENTRY_DELEGATE_TRACK);
fib_node_init(&fed->fd_track.fedt_node,
FIB_NODE_TYPE_ENTRY_TRACK);
fed->fd_entry_index = fei;
fed->fd_track.fedt_sibling =
fib_entry_child_add(fei,
FIB_NODE_TYPE_ENTRY_TRACK,
fib_entry_delegate_get_index(fed));
return (fed);
}
fib_node_index_t
fib_entry_track (u32 fib_index,
const fib_prefix_t *prefix,
fib_node_type_t child_type,
index_t child_index,
u32 *sibling)
{
fib_entry_delegate_t *fed;
fib_node_index_t fei;
fei = fib_table_lookup_exact_match(fib_index, prefix);
if (INDEX_INVALID == fei ||
NULL == (fed = fib_entry_delegate_find(fib_entry_get(fei),
FIB_ENTRY_DELEGATE_TRACK)))
{
fed = fib_entry_track_delegate_add(fib_index, prefix);
}
/*
* add this child to the entry's delegate
*/
*sibling = fib_node_child_add(FIB_NODE_TYPE_ENTRY_TRACK,
fib_entry_delegate_get_index(fed),
child_type,
child_index);
return (fed->fd_entry_index);
}
void
fib_entry_untrack (fib_node_index_t fei,
u32 sibling)
{
fib_entry_delegate_t *fed;
fed = fib_entry_delegate_find(fib_entry_get(fei),
FIB_ENTRY_DELEGATE_TRACK);
if (NULL != fed)
{
fib_node_child_remove(FIB_NODE_TYPE_ENTRY_TRACK,
fib_entry_delegate_get_index(fed),
sibling);
/* if this is the last child the delegate will be removed. */
}
/* else untracked */
}
static fib_node_t *
fib_entry_track_get_node (fib_node_index_t index)
{
fib_entry_delegate_t *fed;
fed = fib_entry_delegate_get(index);
return (&fed->fd_track.fedt_node);
}
static fib_entry_delegate_t*
fib_entry_delegate_from_fib_node (fib_node_t *node)
{
ASSERT(FIB_NODE_TYPE_ENTRY_TRACK == node->fn_type);
return ((fib_entry_delegate_t *) (((char *) node) -
STRUCT_OFFSET_OF (fib_entry_delegate_t,
fd_track.fedt_node)));
}
static void
fib_entry_track_last_lock_gone (fib_node_t *node)
{
fib_entry_delegate_t *fed;
fib_node_index_t fei;
u32 sibling;
fed = fib_entry_delegate_from_fib_node(node);
fei = fed->fd_entry_index;
sibling = fed->fd_track.fedt_sibling;
/*
* the tracker has no more children so it can be removed,
* and the FIB entry unsourced.
* remove the delegate first, then unlock the fib entry,
* since the delegate may be holding the last lock
*/
fib_entry_delegate_remove(fib_entry_get(fei),
FIB_ENTRY_DELEGATE_TRACK);
/* having removed the deletegate the fed object is now toast */
fib_entry_child_remove(fei, sibling);
fib_table_entry_delete_index(fei, FIB_SOURCE_RR);
}
static fib_node_back_walk_rc_t
fib_entry_track_back_walk_notify (fib_node_t *node,
fib_node_back_walk_ctx_t *ctx)
{
fib_entry_delegate_t *fed;
fed = fib_entry_delegate_from_fib_node(node);
/*
* propagate the walk to the delgate's children
*/
fib_walk_sync(FIB_NODE_TYPE_ENTRY_TRACK,
fib_entry_delegate_get_index(fed),
ctx);
return (FIB_NODE_BACK_WALK_CONTINUE);
}
static void
fib_entry_track_show_memory (void)
{
}
/*
* The FIB entry tracker's graph node virtual function table
*/
static const fib_node_vft_t fib_entry_track_vft = {
.fnv_get = fib_entry_track_get_node,
.fnv_last_lock = fib_entry_track_last_lock_gone,
.fnv_back_walk = fib_entry_track_back_walk_notify,
.fnv_mem_show = fib_entry_track_show_memory,
};
void
fib_entry_track_module_init (void)
{
fib_node_register_type(FIB_NODE_TYPE_ENTRY_TRACK, &fib_entry_track_vft);
}
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