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-rw-r--r--src/vnet/bier/bier_bit_string.h107
1 files changed, 107 insertions, 0 deletions
diff --git a/src/vnet/bier/bier_bit_string.h b/src/vnet/bier/bier_bit_string.h
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+++ b/src/vnet/bier/bier_bit_string.h
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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.
+ */
+
+#ifndef __BIER_BIT_STRING_H__
+#define __BIER_BIT_STRING_H__
+
+#include <vppinfra/byte_order.h>
+#include <vppinfra/format.h>
+
+#include <vnet/bier/bier_types.h>
+
+#define BIER_BBS_LEN_TO_BUCKETS(_len) (_len)
+#define BIER_BBS_LEN_TO_BITS(_len) (_len * 8)
+#define BIER_BBS_LEN_TO_INTS(_len) ((_len) / sizeof(int))
+#define BIER_BIT_MASK_BITS_PER_INT (sizeof(int) * 8)
+
+/*
+ * bier_find_first_bit_set
+ *
+ * find the position of the first bit set in a long
+ */
+static inline int
+bier_find_first_bit_string_set (int mask)
+{
+ return (__builtin_ffs(clib_net_to_host_u32(mask)));
+}
+
+extern void bier_bit_string_set_bit(bier_bit_string_t *mask,
+ bier_bp_t bp);
+
+
+extern void bier_bit_string_clear_bit(bier_bit_string_t *mask,
+ bier_bp_t bp);
+
+
+extern u8 *format_bier_bit_string(u8 * s, va_list * args);
+
+#define BIER_BBS_NUM_INT_BUKCETS(_bbs) \
+ (BIER_BBS_LEN_TO_BUCKETS(_bbs->bbs_len) / sizeof(int))
+
+always_inline int
+bier_bit_string_is_zero (const bier_bit_string_t *src)
+{
+ uint16_t index;
+
+ for (index = 0;
+ index < BIER_BBS_NUM_INT_BUKCETS(src);
+ index++) {
+ if (((int*)src->bbs_buckets)[index] != 0) {
+ return (0);
+ }
+ }
+ return (1);
+}
+
+always_inline void
+bier_bit_string_clear_string (const bier_bit_string_t *src,
+ bier_bit_string_t *dest)
+{
+ uint16_t index;
+
+ ASSERT(src->bbs_len == dest->bbs_len);
+
+ for (index = 0;
+ index < BIER_BBS_NUM_INT_BUKCETS(src);
+ index++) {
+ ((int*)dest->bbs_buckets)[index] &= ~(((int*)src->bbs_buckets)[index]);
+ }
+}
+
+always_inline void
+bier_bit_string_logical_and_string (const bier_bit_string_t *src,
+ bier_bit_string_t *dest)
+{
+ uint16_t index;
+
+ ASSERT(src->bbs_len == dest->bbs_len);
+
+ for (index = 0;
+ index < BIER_BBS_NUM_INT_BUKCETS(src);
+ index++) {
+ ((int*)dest->bbs_buckets)[index] &= ((int*)src->bbs_buckets)[index];
+ }
+}
+
+always_inline void
+bier_bit_string_init (bier_bit_string_t *bbs,
+ bier_hdr_len_id_t len,
+ bier_bit_mask_bucket_t *buckets)
+{
+ bbs->bbs_len = bier_hdr_len_id_to_num_bytes(len);
+ bbs->bbs_buckets = buckets;
+}
+
+#endif