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>

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
new file mode 100644
index 00000000000..9baebfa6e69
--- /dev/null
+++ b/src/vnet/bier/bier_bit_string.h
@@ -0,0 +1,107 @@
+/*
+ * 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