NSHSFC-1 Initial move from VPP to NSH_SFC

- API is giving me some negative energy currently
-- I'll work it out but wanted to publish both VPP-61 and this simultaneously

Change-Id: I4a04b56dd470655114605621d0c44ea3c26bc069
Signed-off-by: Keith Burns (alagalah) <alagalah@gmail.com>
Signed-off-by: Ed Warnicke <eaw@cisco.com>

1 files changed, 130 insertions, 0 deletions

diff --git a/nsh-plugin/nsh/nsh.h b/nsh-plugin/nsh/nsh.h
new file mode 100644
index 0000000..c574148
--- /dev/null
+++ b/nsh-plugin/nsh/nsh.h
@@ -0,0 +1,130 @@
+/*
+ * Copyright (c) 2015 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 included_nsh_h
+#define included_nsh_h
+
+#include <vnet/vnet.h>
+#include <nsh/nsh_packet.h>
+#include <vnet/ip/ip4_packet.h>
+
+typedef struct {
+
+  /** Key for nsh_header_t entry: 24bit NSP 8bit NSI */
+  u32 nsp_nsi;
+
+  /** Key for nsh_header_t entry to map to. : 24bit NSP 8bit NSI 
+   *  This may be ~0 if next action is to decap to NSH next protocol
+   *  Note the following heuristic:
+   *  if nsp_nsi == mapped_nsp_nsi then use-case is like SFC SFF
+   *  if nsp_nsi != mapped_nsp_nsi then use-case is like SFC SF
+   *  Note: these are heuristics. Rules about NSI decrement are out of scope
+   */
+  u32 mapped_nsp_nsi;
+
+  /* vnet intfc sw_if_index */
+  u32 sw_if_index;
+
+  u32 next_node;
+
+} nsh_map_t;
+
+typedef struct {
+  nsh_map_t map;
+  u32 is_add;
+} nsh_add_del_map_args_t;
+
+typedef struct {
+  u8 is_add;
+  nsh_header_t nsh;
+} nsh_add_del_entry_args_t;
+
+typedef struct {
+  /* API message ID base */
+  u16 msg_id_base;
+
+  /* vector of nsh_header entry instances */
+  nsh_header_t *nsh_entries;
+
+  /* hash lookup nsh header by key: {u32: nsp_nsi} */
+  uword * nsh_entry_by_key;
+
+  /* vector of nsh_mappings */
+  nsh_map_t *nsh_mappings;
+
+  /* hash lookup nsh mapping by key: {u32: nsp_nsi} */
+  uword * nsh_mapping_by_key;
+  uword * nsh_mapping_by_mapped_key; // for use in NSHSFC
+
+  /* convenience */
+  vlib_main_t * vlib_main;
+  vnet_main_t * vnet_main;
+} nsh_main_t;
+
+nsh_main_t nsh_main;
+
+u8 * format_nsh_input_map_trace (u8 * s, va_list * args);
+u8 * format_nsh_header_with_length (u8 * s, va_list * args);
+
+/* Helper macros used in nsh.c and nsh_test.c */
+#define foreach_copy_nshhdr_field               \
+_(ver_o_c)					\
+_(length)					\
+_(md_type)					\
+_(next_protocol)				\
+_(nsp_nsi)					\
+_(c1)						\
+_(c2)						\
+_(c3)						\
+_(c4)						
+/* TODO Temp killing tlvs as its causing pain - fix in NSH_SFC */
+#define foreach_32bit_field			\
+_(nsp_nsi)                                      \
+_(c1)                                           \
+_(c2)                                           \
+_(c3)                                           \
+_(c4)
+
+/* Statistics (not really errors) */
+#define foreach_nsh_input_error    \
+_(MAPPED, "NSH header found and mapped") \
+_(NO_MAPPING, "no mapping for nsh key") \
+_(INVALID_NEXT_PROTOCOL, "invalid next protocol") \
+
+typedef enum {
+#define _(sym,str) NSH_INPUT_ERROR_##sym,
+    foreach_nsh_input_error
+#undef _
+  NSH_INPUT_N_ERROR,
+
+} nsh_input_error_t;
+
+#define foreach_nsh_input_next        \
+  _(DROP, "error-drop")			\
+  _(ENCAP_GRE, "gre-input" )		\
+  _(ENCAP_VXLANGPE, "vxlan-gpe-encap" ) \
+/* /\* TODO once moved to Project:NSH_SFC *\/ */
+  /* _(ENCAP_ETHERNET, "*** TX TO ETHERNET ***")   \ */
+/*   _(DECAP_ETHERNET_LOOKUP, "ethernet-input" )	\ */
+/*   _(DECAP_IP4_INPUT,  "ip4-input") \ */
+/*   _(DECAP_IP6_INPUT,  "ip6-input" ) \  */
+
+typedef enum {
+#define _(s,n) NSH_INPUT_NEXT_##s,
+  foreach_nsh_input_next
+#undef _
+  NSH_INPUT_N_NEXT,
+} nsh_input_next_t;
+
+#endif /* included_nsh_h */