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authorNeale Ranns <nranns@cisco.com>2017-10-21 10:53:20 -0700
committerDamjan Marion <dmarion.lists@gmail.com>2017-11-09 15:16:52 +0000
commitd792d9c01e60656cbfe1b0f1fd6a9b125f5dab0c (patch)
treedb88d99dd8102389fb92e8ed44bc7d6a55dc3080 /src/vnet/bier/bier_bit_string.c
parenta2ff7b8cfc829ffbb6d5de7534efb51f7cba9cf3 (diff)
BIER
- see draft-ietf-bier-mpls-encapsulation-10 - midpoint, head and tail functions - supported payload protocols; IPv4 and IPv6 only. Change-Id: I59d7363bb6fdfdce8e4016a68a9c8f5a5e5791cb Signed-off-by: Neale Ranns <nranns@cisco.com>
Diffstat (limited to 'src/vnet/bier/bier_bit_string.c')
-rw-r--r--src/vnet/bier/bier_bit_string.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/src/vnet/bier/bier_bit_string.c b/src/vnet/bier/bier_bit_string.c
new file mode 100644
index 00000000000..aa42e083be8
--- /dev/null
+++ b/src/vnet/bier/bier_bit_string.c
@@ -0,0 +1,109 @@
+/*
+ * 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;
+ uint16_t 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)
+{
+ uint16_t 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);
+}