hash: add support for hashing infra

Type: feature

Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com>
Change-Id: I3652ae275385d9b1eb1b11f418e3a7e5fef2f556

1 files changed, 59 insertions, 0 deletions

diff --git a/src/vnet/hash/hash.h b/src/vnet/hash/hash.h
new file mode 100644
index 00000000000..c1eb9475e28
--- /dev/null
+++ b/src/vnet/hash/hash.h
@@ -0,0 +1,59 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ * Copyright(c) 2021 Cisco Systems, Inc.
+ */
+
+#ifndef __VNET_HASH_H__
+#define __VNET_HASH_H__
+
+#include <vlib/vlib.h>
+
+#define foreach_vnet_hash_fn_types                                            \
+  _ (ETHERNET, 0, "hash-fn-ethernet")                                         \
+  _ (IP, 1, "hash-fn-ip")
+
+typedef enum
+{
+#define _(f, n, s) VNET_HASH_FN_TYPE_##f,
+  foreach_vnet_hash_fn_types
+#undef _
+    VNET_HASH_FN_TYPE_N,
+} vnet_hash_fn_type_t;
+
+typedef void (*vnet_hash_fn_t) (void **p, u32 *h, u32 n_packets);
+
+typedef struct vnet_hash_function_registration
+{
+  const char *name;
+  const char *description;
+  int priority;
+  vnet_hash_fn_t function[VNET_HASH_FN_TYPE_N];
+
+  struct vnet_hash_function_registration *next;
+} vnet_hash_function_registration_t;
+
+typedef struct
+{
+  vnet_hash_function_registration_t *hash_registrations;
+} vnet_hash_main_t;
+
+extern vnet_hash_main_t vnet_hash_main;
+
+#define VNET_REGISTER_HASH_FUNCTION(x, ...)                                   \
+  __VA_ARGS__ vnet_hash_function_registration_t __vnet_hash_function_##x;     \
+  static void __clib_constructor __vnet_hash_function_registration_##x (void) \
+  {                                                                           \
+    vnet_hash_main_t *hm = &vnet_hash_main;                                   \
+    __vnet_hash_function_##x.next = hm->hash_registrations;                   \
+    hm->hash_registrations = &__vnet_hash_function_##x;                       \
+  }                                                                           \
+  __VA_ARGS__ vnet_hash_function_registration_t __vnet_hash_function_##x
+
+vnet_hash_fn_t vnet_hash_default_function (vnet_hash_fn_type_t ftype);
+vnet_hash_fn_t vnet_hash_function_from_name (const char *name,
+					     vnet_hash_fn_type_t ftype);
+vnet_hash_function_registration_t *
+vnet_hash_function_from_func (vnet_hash_fn_t fn, vnet_hash_fn_type_t ftype);
+format_function_t format_vnet_hash;
+
+#endif