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/*
* Copyright (c) 2015 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.
*/
/*
* ip/ip4_fib.h: ip4 mtrie fib
*
* Copyright (c) 2012 Eliot Dresselhaus
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef included_ip_ip4_fib_h
#define included_ip_ip4_fib_h
#include <vppinfra/cache.h>
#include <vppinfra/vector.h>
#include <vnet/ip/lookup.h>
#include <vnet/ip/ip4_packet.h> /* for ip4_address_t */
/* ip4 fib leafs: 4 ply 8-8-8-8 mtrie.
1 + 2*adj_index for terminal leaves.
0 + 2*next_ply_index for non-terminals, i.e. PLYs
1 => empty (adjacency index of zero is special miss adjacency). */
typedef u32 ip4_fib_mtrie_leaf_t;
#define IP4_FIB_MTRIE_LEAF_EMPTY (1 + 2*0)
/**
* @brief the 16 way stride that is the top PLY of the mtrie
* We do not maintain the count of 'real' leaves in this PLY, since
* it is never removed. The FIB will destroy the mtrie and the ply once
* the FIB is destroyed.
*/
#define PLY_16_SIZE (1<<16)
typedef struct ip4_fib_mtrie_16_ply_t_
{
/**
* The leaves/slots/buckets to be filed with leafs
*/
union
{
ip4_fib_mtrie_leaf_t leaves[PLY_16_SIZE];
#ifdef CLIB_HAVE_VEC128
u32x4 leaves_as_u32x4[PLY_16_SIZE / 4];
#endif
};
/**
* Prefix length for terminal leaves.
*/
u8 dst_address_bits_of_leaves[PLY_16_SIZE];
} ip4_fib_mtrie_16_ply_t;
/**
* @brief One ply of the 4 ply mtrie fib.
*/
typedef struct ip4_fib_mtrie_8_ply_t_
{
/**
* The leaves/slots/buckets to be filed with leafs
*/
union
{
ip4_fib_mtrie_leaf_t leaves[256];
#ifdef CLIB_HAVE_VEC128
u32x4 leaves_as_u32x4[256 / 4];
#endif
};
/**
* Prefix length for leaves/ply.
*/
u8 dst_address_bits_of_leaves[256];
/**
* Number of non-empty leafs (whether terminal or not).
*/
i32 n_non_empty_leafs;
/**
* The length of the ply's coviering prefix. Also a measure of its depth
* If a leaf in a slot has a mask length longer than this then it is
* 'non-empty'. Otherwise it is the value of the cover.
*/
i32 dst_address_bits_base;
/* Pad to cache line boundary. */
u8 pad[CLIB_CACHE_LINE_BYTES - 2 * sizeof (i32)];
}
ip4_fib_mtrie_8_ply_t;
STATIC_ASSERT (0 == sizeof (ip4_fib_mtrie_8_ply_t) % CLIB_CACHE_LINE_BYTES,
"IP4 Mtrie ply cache line");
/**
* @brief The mutiway-TRIE.
* There is no data associated with the mtrie apart from the top PLY
*/
typedef struct
{
/**
* Embed the PLY with the mtrie struct. This means that the Data-plane
* 'get me the mtrie' returns the first ply, and not an indirect 'pointer'
* to it. therefore no cachline misses in the data-path.
*/
ip4_fib_mtrie_16_ply_t root_ply;
} ip4_fib_mtrie_t;
/**
* @brief Initialise an mtrie
*/
void ip4_mtrie_init (ip4_fib_mtrie_t * m);
/**
* @brief Free an mtrie, It must be emty when free'd
*/
void ip4_mtrie_free (ip4_fib_mtrie_t * m);
/**
* @brief Add a route/rntry to the mtrie
*/
void ip4_fib_mtrie_route_add (ip4_fib_mtrie_t * m,
const ip4_address_t * dst_address,
u32 dst_address_length, u32 adj_index);
/**
* @brief remove a route/rntry to the mtrie
*/
void ip4_fib_mtrie_route_del (ip4_fib_mtrie_t * m,
const ip4_address_t * dst_address,
u32 dst_address_length,
u32 adj_index,
u32 cover_address_length, u32 cover_adj_index);
/**
* @brief Format/display the contents of the mtrie
*/
format_function_t format_ip4_fib_mtrie;
/**
* @brief A global pool of 8bit stride plys
*/
extern ip4_fib_mtrie_8_ply_t *ip4_ply_pool;
/**
* Is the leaf terminal (i.e. an LB index) or non-terminak (i.e. a PLY index)
*/
always_inline u32
ip4_fib_mtrie_leaf_is_terminal (ip4_fib_mtrie_leaf_t n)
{
return n & 1;
}
/**
* From the stored slot value extract the LB index value
*/
always_inline u32
ip4_fib_mtrie_leaf_get_adj_index (ip4_fib_mtrie_leaf_t n)
{
ASSERT (ip4_fib_mtrie_leaf_is_terminal (n));
return n >> 1;
}
/**
* @brief Lookup step. Processes 1 byte of 4 byte ip4 address.
*/
always_inline ip4_fib_mtrie_leaf_t
ip4_fib_mtrie_lookup_step (const ip4_fib_mtrie_t * m,
ip4_fib_mtrie_leaf_t current_leaf,
const ip4_address_t * dst_address,
u32 dst_address_byte_index)
{
ip4_fib_mtrie_8_ply_t *ply;
uword current_is_terminal = ip4_fib_mtrie_leaf_is_terminal (current_leaf);
if (!current_is_terminal)
{
ply = ip4_ply_pool + (current_leaf >> 1);
return (ply->leaves[dst_address->as_u8[dst_address_byte_index]]);
}
return current_leaf;
}
/**
* @brief Lookup step number 1. Processes 2 bytes of 4 byte ip4 address.
*/
always_inline ip4_fib_mtrie_leaf_t
ip4_fib_mtrie_lookup_step_one (const ip4_fib_mtrie_t * m,
const ip4_address_t * dst_address)
{
ip4_fib_mtrie_leaf_t next_leaf;
next_leaf = m->root_ply.leaves[dst_address->as_u16[0]];
return next_leaf;
}
#endif /* included_ip_ip4_fib_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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