pvti: Packet Vector Tunnel Interface

This plugin implements a PoC of UDP-based tunnel substrate whose aim is
to specifically provide higher MTU to the upper layers by chunking
the payload PDUs into smaller packets with full 5-tuple.

At the same time, if there are multiple small packets to
the same destination during the vector processing, they
are packed into "carrier" packets up to underlay MTU size.

It does assume a trustworthy underlying medium, thus for the
operation over Internet it requires the use of encryption layer
underneath.

Type: feature
Change-Id: I323958fa8de62584f6ed15643ea689568a9a62bc
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>

1 files changed, 85 insertions, 0 deletions

diff --git a/src/plugins/pvti/output-main.c b/src/plugins/pvti/output-main.c
new file mode 100644
index 00000000000..ae4ae5f8e98
--- /dev/null
+++ b/src/plugins/pvti/output-main.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2024 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 <pvti/output.h>
+
+/* packet trace format function */
+static u8 *
+format_pvti_output_trace (u8 *s, va_list *args)
+{
+  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+  pvti_output_trace_t *t = va_arg (*args, pvti_output_trace_t *);
+
+  u32 indent = format_get_indent (s);
+  s =
+    format (s, "PVTI-OUT(%d): sw_if_index %d, next index %d, underlay_mtu %d,",
+	    t->trace_type, t->sw_if_index, t->next_index, t->underlay_mtu);
+  s = format (s, "\n%U stream_index %d, bi0_max_current_length %d, tx_seq %d",
+	      format_white_space, indent, t->stream_index,
+	      t->bi0_max_current_length, t->tx_seq);
+  s = format (s, "\n%U%U", format_white_space, indent,
+	      format_ip_adjacency_packet_data, t->packet_data,
+	      sizeof (t->packet_data));
+
+  return s;
+}
+
+vlib_node_registration_t pvti_output_node;
+
+static char *pvti_output_error_strings[] = {
+#define _(sym, string) string,
+  foreach_pvti_output_error
+#undef _
+};
+
+VLIB_REGISTER_NODE (pvti4_output_node) =
+{
+  .name = "pvti4-output",
+  .vector_size = sizeof (u32),
+  .format_trace = format_pvti_output_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .n_errors = ARRAY_LEN(pvti_output_error_strings),
+  .error_strings = pvti_output_error_strings,
+
+  .n_next_nodes = PVTI_OUTPUT_N_NEXT,
+
+  .next_nodes = {
+        [PVTI_OUTPUT_NEXT_DROP] = "error-drop",
+        [PVTI_OUTPUT_NEXT_INTERFACE_OUTPUT] = "adj-midchain-tx",
+        [PVTI_OUTPUT_NEXT_IP4_LOOKUP] = "ip4-lookup",
+        [PVTI_OUTPUT_NEXT_IP6_LOOKUP] = "ip6-lookup",
+  },
+
+};
+VLIB_REGISTER_NODE (pvti6_output_node) =
+{
+  .name = "pvti6-output",
+  .vector_size = sizeof (u32),
+  .format_trace = format_pvti_output_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .n_errors = ARRAY_LEN(pvti_output_error_strings),
+  .error_strings = pvti_output_error_strings,
+
+  .n_next_nodes = PVTI_OUTPUT_N_NEXT,
+
+  .next_nodes = {
+        [PVTI_OUTPUT_NEXT_DROP] = "error-drop",
+        [PVTI_OUTPUT_NEXT_INTERFACE_OUTPUT] = "adj-midchain-tx",
+        [PVTI_OUTPUT_NEXT_IP4_LOOKUP] = "ip4-lookup",
+        [PVTI_OUTPUT_NEXT_IP6_LOOKUP] = "ip6-lookup",
+  },
+
+};