fib: Support the POP of a Psuedo Wire Control Word

Type: feature

Change-Id: Ib24547a7c4c73ceb5383d1ca8f14ec40e6a90f01
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 80 insertions, 0 deletions

diff --git a/src/vnet/dpo/pw_cw.h b/src/vnet/dpo/pw_cw.h
new file mode 100644
index 00000000000..96f8c72c9d0
--- /dev/null
+++ b/src/vnet/dpo/pw_cw.h
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2019 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 __PW_CW_DPO_H__
+#define __PW_CW_DPO_H__
+
+#include <vnet/vnet.h>
+#include <vnet/mpls/packet.h>
+#include <vnet/dpo/dpo.h>
+
+/**
+ * A Psuedo Wire Control Word is 4 bytes
+ */
+typedef u32 pw_cw_t;
+
+/**
+ * A representation of a Psuedo Wire Control Word pop DPO
+ */
+typedef struct pw_cw_dpo_t
+{
+    /**
+     * Next DPO in the graph
+     */
+    dpo_id_t pwcw_parent;
+
+    /**
+     * Number of locks/users of the label
+     */
+    u16 pwcw_locks;
+} pw_cw_dpo_t;
+
+/**
+ * @brief Assert that the MPLS label object is less than a cache line in size.
+ * Should this get any bigger then we will need to reconsider how many labels
+ * can be pushed in one object.
+ */
+STATIC_ASSERT_SIZEOF(pw_cw_dpo_t, 2 * sizeof(u64));
+
+/* #define STATIC_ASSERT_ALIGNOF(d, s)                                      \ */
+/*     STATIC_ASSERT (alignof (d) == sizeof(s), "Align of " #d " must be " # s " bytes") */
+
+/* STATIC_ASSERT_AIGNOF(pw_cw_dpo_t, u64); */
+
+/**
+ * @brief Create an PW CW pop
+ *
+ * @param parent The parent of the created MPLS label object
+ * @param dpo The PW CW DPO created
+ */
+extern void pw_cw_dpo_create(const dpo_id_t *paremt,
+                             dpo_id_t *dpo);
+
+extern u8* format_pw_cw_dpo(u8 *s, va_list *args);
+
+/*
+ * Encapsulation violation for fast data-path access
+ */
+extern pw_cw_dpo_t *pw_cw_dpo_pool;
+
+static inline pw_cw_dpo_t *
+pw_cw_dpo_get (index_t index)
+{
+    return (pool_elt_at_index(pw_cw_dpo_pool, index));
+}
+
+extern void pw_cw_dpo_module_init(void);
+
+#endif