VPP-470: Introduce VxLAN-GPE as transport for iOAM.

See Jira ticket for more details
- New plugins created to (a) Add VxLAN-GPE as transport (b) Provide export infra for
  VxLAN-GPE.

Change-Id: Ife50c7434f53d17a4783062310f73d063d53494c
Signed-off-by: Vengada Govindan <venggovi@cisco.com>

1 files changed, 223 insertions, 0 deletions

diff --git a/plugins/ioam-plugin/ioam/lib-vxlan-gpe/ioam_decap.c b/plugins/ioam-plugin/ioam/lib-vxlan-gpe/ioam_decap.c
new file mode 100644
index 00000000000..f938a330446
--- /dev/null
+++ b/plugins/ioam-plugin/ioam/lib-vxlan-gpe/ioam_decap.c
@@ -0,0 +1,223 @@
+/*
+ * 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.
+ */
+#include <vppinfra/error.h>
+#include <vppinfra/hash.h>
+#include <vnet/vnet.h>
+#include <vnet/ip/ip.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/vxlan-gpe/vxlan_gpe.h>
+#include <vnet/vxlan-gpe/vxlan_gpe.h>
+#include <ioam/lib-vxlan-gpe/vxlan_gpe_ioam_packet.h>
+#include <ioam/lib-vxlan-gpe/vxlan_gpe_ioam.h>
+#include <ioam/lib-vxlan-gpe/vxlan_gpe_ioam_util.h>
+
+/* Statistics (not really errors) */
+#define foreach_vxlan_gpe_decap_ioam_v4_error    \
+_(DECAPSULATED, "good packets decapsulated")
+
+static char *vxlan_gpe_decap_ioam_v4_error_strings[] = {
+#define _(sym,string) string,
+  foreach_vxlan_gpe_decap_ioam_v4_error
+#undef _
+};
+
+typedef enum
+{
+#define _(sym,str) VXLAN_GPE_DECAP_IOAM_V4_ERROR_##sym,
+  foreach_vxlan_gpe_decap_ioam_v4_error
+#undef _
+    VXLAN_GPE_DECAP_IOAM_V4_N_ERROR,
+} vxlan_gpe_decap_ioam_v4_error_t;
+
+
+always_inline void
+vxlan_gpe_decap_ioam_v4_two_inline (vlib_main_t * vm,
+				    vlib_node_runtime_t * node,
+				    vxlan_gpe_main_t * ngm,
+				    vlib_buffer_t * b0, vlib_buffer_t * b1,
+				    u32 * next0, u32 * next1)
+{
+  vxlan_gpe_ioam_main_t *hm = &vxlan_gpe_ioam_main;
+
+  next0[0] = next1[0] = hm->decap_v4_next_override;
+  vxlan_gpe_encap_decap_ioam_v4_one_inline (vm, node, ngm, b0, &next0[0],
+					    VXLAN_GPE_DECAP_IOAM_V4_NEXT_DROP,
+					    0 /* use_adj */ );
+  vxlan_gpe_encap_decap_ioam_v4_one_inline (vm, node, ngm, b1, &next0[1],
+					    VXLAN_GPE_DECAP_IOAM_V4_NEXT_DROP,
+					    0 /* use_adj */ );
+}
+
+
+
+static uword
+vxlan_gpe_decap_ioam (vlib_main_t * vm,
+		      vlib_node_runtime_t * node,
+		      vlib_frame_t * from_frame, u8 is_ipv6)
+{
+  u32 n_left_from, next_index, *from, *to_next;
+  vxlan_gpe_main_t *ngm = &vxlan_gpe_main;
+  vxlan_gpe_ioam_main_t *hm = &vxlan_gpe_ioam_main;
+
+  from = vlib_frame_vector_args (from_frame);
+  n_left_from = from_frame->n_vectors;
+
+  next_index = node->cached_next_index;
+
+  while (n_left_from > 0)
+    {
+      u32 n_left_to_next;
+
+      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+      while (n_left_from >= 4 && n_left_to_next >= 2)
+	{
+	  u32 bi0, bi1;
+	  vlib_buffer_t *b0, *b1;
+	  u32 next0, next1;
+
+	  next0 = next1 = hm->decap_v4_next_override;
+
+	  /* Prefetch next iteration. */
+	  {
+	    vlib_buffer_t *p2, *p3;
+
+	    p2 = vlib_get_buffer (vm, from[2]);
+	    p3 = vlib_get_buffer (vm, from[3]);
+
+	    vlib_prefetch_buffer_header (p2, LOAD);
+	    vlib_prefetch_buffer_header (p3, LOAD);
+
+	    CLIB_PREFETCH (p2->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
+	    CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
+	  }
+
+	  bi0 = from[0];
+	  bi1 = from[1];
+	  to_next[0] = bi0;
+	  to_next[1] = bi1;
+	  from += 2;
+	  to_next += 2;
+	  n_left_to_next -= 2;
+	  n_left_from -= 2;
+
+	  b0 = vlib_get_buffer (vm, bi0);
+	  b1 = vlib_get_buffer (vm, bi1);
+
+
+	  vlib_buffer_advance (b0,
+			       -(word) (sizeof (udp_header_t) +
+					sizeof (ip4_header_t) +
+					sizeof (vxlan_gpe_header_t)));
+	  vlib_buffer_advance (b1,
+			       -(word) (sizeof (udp_header_t) +
+					sizeof (ip4_header_t) +
+					sizeof (vxlan_gpe_header_t)));
+
+	  vxlan_gpe_decap_ioam_v4_two_inline (vm, node, ngm, b0, b1,
+					      &next0, &next1);
+
+
+	  vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
+					   n_left_to_next, bi0, bi1, next0,
+					   next1);
+
+	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+	    {
+	      vxlan_gpe_ioam_v4_trace_t *tr = vlib_add_trace (vm, node, b0,
+							      sizeof (*tr));
+	    }
+	}
+
+      while (n_left_from > 0 && n_left_to_next > 0)
+	{
+	  u32 bi0;
+	  vlib_buffer_t *b0;
+	  u32 next0 = hm->decap_v4_next_override;
+
+	  bi0 = from[0];
+	  to_next[0] = bi0;
+	  from += 1;
+	  to_next += 1;
+	  n_left_from -= 1;
+	  n_left_to_next -= 1;
+
+	  b0 = vlib_get_buffer (vm, bi0);
+
+
+	  vlib_buffer_advance (b0,
+			       -(word) (sizeof (udp_header_t) +
+					sizeof (ip4_header_t) +
+					sizeof (vxlan_gpe_header_t)));
+
+	  next0 = hm->decap_v4_next_override;
+	  vxlan_gpe_encap_decap_ioam_v4_one_inline (vm, node, ngm, b0,
+						    &next0,
+						    VXLAN_GPE_DECAP_IOAM_V4_NEXT_DROP,
+						    0 /* use_adj */ );
+
+	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+	    {
+	      vxlan_gpe_ioam_v4_trace_t *tr = vlib_add_trace (vm, node, b0,
+							      sizeof (*tr));
+	    }
+	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
+					   n_left_to_next, bi0, next0);
+	}
+
+      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+    }
+
+  return from_frame->n_vectors;
+}
+
+
+static uword
+vxlan_gpe_decap_ioam_v4 (vlib_main_t * vm,
+			 vlib_node_runtime_t * node,
+			 vlib_frame_t * from_frame)
+{
+  return vxlan_gpe_decap_ioam (vm, node, from_frame, 0);
+}
+
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (vxlan_gpe_decap_ioam_v4_node) = {
+  .function = vxlan_gpe_decap_ioam_v4,
+  .name = "vxlan-gpe-decap-ioam-v4",
+  .vector_size = sizeof (u32),
+  .format_trace = format_vxlan_gpe_ioam_v4_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = ARRAY_LEN(vxlan_gpe_decap_ioam_v4_error_strings),
+  .error_strings = vxlan_gpe_decap_ioam_v4_error_strings,
+
+  .n_next_nodes = VXLAN_GPE_DECAP_IOAM_V4_N_NEXT,
+
+  .next_nodes = {
+    [VXLAN_GPE_DECAP_IOAM_V4_NEXT_POP] = "vxlan-gpe-pop-ioam-v4",
+    [VXLAN_GPE_DECAP_IOAM_V4_NEXT_DROP] = "error-drop",
+  },
+};
+/* *INDENT-ON* */
+
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */