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Vector Packet Processing
bier_bit_string.c
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1 /*
2  * Copyright (c) 2016 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #include <vnet/vnet.h>
17 
18 #include <vnet/bier/bier_types.h>
20 
21 /*
22  * the first bit in the first byte is bit position 1.
23  * bit position 0 is not valid
24  */
25 #define BIER_GET_STRING_POS(_bp, _byte, _bit, _str) \
26 { \
27  _bp--; \
28  _byte = ((BIER_BBS_LEN_TO_BUCKETS((_str)->bbs_len) - 1 ) - \
29  (_bp / BIER_BIT_MASK_BITS_PER_BUCKET)); \
30  _bit = _bp % BIER_BIT_MASK_BITS_PER_BUCKET; \
31 }
32 
33 static inline int
35 {
36  if (!((bp <= BIER_BBS_LEN_TO_BITS((bbs)->bbs_len)) &&
37  (bp >= 1))) {
38  return (0);
39  }
40  return (1);
41 }
42 
43 /*
44  * Validate a bit position
45  */
46 #define BIER_BIT_POS_IS_VALID(_bp, _str) \
47 { \
48  if (!bier_bit_pos_is_valid(_bp, _str)) return; \
49 }
50 
51 void
53  bier_bp_t bp)
54 {
56  u16 byte_pos, bit_pos;
57 
58  BIER_BIT_POS_IS_VALID(bp, bit_string);
59  BIER_GET_STRING_POS(bp, byte_pos, bit_pos, bit_string);
60 
61  bmask = ((bier_bit_mask_bucket_t)1 << bit_pos);
62  bit_string->bbs_buckets[byte_pos] |= bmask;
63 }
64 
65 void
67  bier_bp_t bp)
68 {
69  u16 byte_pos, bit_pos;
70 
71  BIER_BIT_POS_IS_VALID(bp, bit_string);
72  BIER_GET_STRING_POS(bp, byte_pos, bit_pos, bit_string);
73 
74  bit_string->bbs_buckets[byte_pos] &= ~(1 << bit_pos);
75 }
76 
77 u8 *
79  va_list * args)
80 {
81  bier_bit_string_t *bs = va_arg(*args, bier_bit_string_t *);
82  int leading_marker = 0;
83  int suppress_zero = 0;
84  u16 index;
85  u32 *ptr;
86 
87  ptr = (u32 *)bs->bbs_buckets;
88 
89  string = format(string, "%d#", (8 * bs->bbs_len));
90 
91  for (index = 0; index < (bs->bbs_len/4); index++) {
92  if (!ptr[index]) {
93  if (!leading_marker) {
94  leading_marker = 1;
95  suppress_zero = 1;
96  string = format(string, ":");
97  continue;
98  }
99  if (suppress_zero) continue;
100  } else {
101  suppress_zero = 0;
102  }
103 
104  string = format(string, "%s%X", index ? ":" : "",
105  clib_net_to_host_u32(ptr[index]));
106  }
107 
108  return (string);
109 }
u8 * format_bier_bit_string(u8 *string, va_list *args)
void bier_bit_string_set_bit(bier_bit_string_t *bit_string, bier_bp_t bp)
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:424
unsigned char u8
Definition: types.h:56
u16 bbs_len
The length of the string in BYTES.
Definition: bier_types.h:282
A Variable length BitString.
Definition: bier_types.h:278
unsigned int u32
Definition: types.h:88
u32 bier_bp_t
A bit positon as assigned to egress PEs.
Definition: bier_types.h:294
unsigned short u16
Definition: types.h:57
void bier_bit_string_clear_bit(bier_bit_string_t *bit_string, bier_bp_t bp)
#define BIER_GET_STRING_POS(_bp, _byte, _bit, _str)
#define BIER_BBS_LEN_TO_BITS(_len)
static int bier_bit_pos_is_valid(bier_bp_t bp, const bier_bit_string_t *bbs)
bier_bit_mask_bucket_t * bbs_buckets
The buckets in the string.
Definition: bier_types.h:287
#define BIER_BIT_POS_IS_VALID(_bp, _str)
u8 bier_bit_mask_bucket_t
A bucket is a byte.
Definition: bier_types.h:257