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/*
* Copyright (c) 2016 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/vnet.h>
#include <vnet/bier/bier_types.h>
#include <vnet/bier/bier_bit_string.h>
/*
* the first bit in the first byte is bit position 1.
* bit position 0 is not valid
*/
#define BIER_GET_STRING_POS(_bp, _byte, _bit, _str) \
{ \
_bp--; \
_byte = ((BIER_BBS_LEN_TO_BUCKETS((_str)->bbs_len) - 1 ) - \
(_bp / BIER_BIT_MASK_BITS_PER_BUCKET)); \
_bit = _bp % BIER_BIT_MASK_BITS_PER_BUCKET; \
}
static inline int
bier_bit_pos_is_valid (bier_bp_t bp, const bier_bit_string_t *bbs)
{
if (!((bp <= BIER_BBS_LEN_TO_BITS((bbs)->bbs_len)) &&
(bp >= 1))) {
return (0);
}
return (1);
}
/*
* Validate a bit poistion
*/
#define BIER_BIT_POS_IS_VALID(_bp, _str) \
{ \
if (!bier_bit_pos_is_valid(_bp, _str)) return; \
}
void
bier_bit_string_set_bit (bier_bit_string_t *bit_string,
bier_bp_t bp)
{
bier_bit_mask_bucket_t bmask;
u16 byte_pos, bit_pos;
BIER_BIT_POS_IS_VALID(bp, bit_string);
BIER_GET_STRING_POS(bp, byte_pos, bit_pos, bit_string);
bmask = ((bier_bit_mask_bucket_t)1 << bit_pos);
bit_string->bbs_buckets[byte_pos] |= bmask;
}
void
bier_bit_string_clear_bit (bier_bit_string_t *bit_string,
bier_bp_t bp)
{
u16 byte_pos, bit_pos;
BIER_BIT_POS_IS_VALID(bp, bit_string);
BIER_GET_STRING_POS(bp, byte_pos, bit_pos, bit_string);
bit_string->bbs_buckets[byte_pos] &= ~(1 << bit_pos);
}
u8 *
format_bier_bit_string (u8 * string,
va_list * args)
{
bier_bit_string_t *bs = va_arg(*args, bier_bit_string_t *);
int leading_marker = 0;
int suppress_zero = 0;
u16 index;
u32 *ptr;
ptr = (u32 *)bs->bbs_buckets;
string = format(string, "%d#", (8 * bs->bbs_len));
for (index = 0; index < (bs->bbs_len/4); index++) {
if (!ptr[index]) {
if (!leading_marker) {
leading_marker = 1;
suppress_zero = 1;
string = format(string, ":");
continue;
}
if (suppress_zero) continue;
} else {
suppress_zero = 0;
}
string = format(string, "%s%X", index ? ":" : "",
clib_net_to_host_u32(ptr[index]));
}
return (string);
}
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