ikev2: handoff packets

current approach saves state in per-thread data structure. in
multi-worker + nat-t cases udp/500 and udp/4500 might be dispatched on
different workers. this patch adds hands off packet to 1 explicit thread
- 1st worker (or main thread in case there're no workers) or to thread
  that was explicitly set by user via configuration

Type: improvement

Change-Id: Ib5cd9a4b8612dfaa63b276035709524f7a492d4f
Signed-off-by: Stanislav Zaikin <stanislav.zaikin@46labs.com>

1 files changed, 165 insertions, 0 deletions

diff --git a/src/plugins/ikev2/ikev2_handoff.c b/src/plugins/ikev2/ikev2_handoff.c
new file mode 100644
index 00000000000..8f55985bce8
--- /dev/null
+++ b/src/plugins/ikev2/ikev2_handoff.c
@@ -0,0 +1,165 @@
+/*
+ * 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 <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <ikev2/ikev2_priv.h>
+
+extern ikev2_main_t ikev2_main;
+
+#define foreach_ikev2_handoff_error _ (CONGESTION_DROP, "congestion drop")
+
+typedef enum
+{
+#define _(sym, str) IKEV2_HANDOFF_ERROR_##sym,
+  foreach_ikev2_handoff_error
+#undef _
+    IKEV2_HANDOFF_N_ERROR,
+} ikev2_handoff_error_t;
+
+static char *ikev2_handoff_error_strings[] = {
+#define _(sym, string) string,
+  foreach_ikev2_handoff_error
+#undef _
+};
+
+typedef struct ikev2_handoff_trace_t_
+{
+  u32 current_worker_index;
+  u32 next_worker_index;
+} ikev2_handoff_trace_t;
+
+u8 *
+format_ikev2_handoff_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 *);
+
+  ikev2_handoff_trace_t *t = va_arg (*args, ikev2_handoff_trace_t *);
+  s = format (s, "ikev2 handoff  %d to %d", t->current_worker_index,
+	      t->next_worker_index);
+  return s;
+}
+
+static_always_inline uword
+ikev2_handoff_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
+		      vlib_frame_t *frame, u32 fq_index)
+{
+  ikev2_main_t *km = &ikev2_main;
+  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
+  u16 thread_indices[VLIB_FRAME_SIZE], *ti;
+  u32 n_enq, n_left_from, *from;
+  u32 this_thread;
+
+  this_thread = vm->thread_index;
+
+  from = vlib_frame_vector_args (frame);
+  n_left_from = frame->n_vectors;
+  vlib_get_buffers (vm, from, bufs, n_left_from);
+
+  b = bufs;
+  ti = thread_indices;
+
+  while (n_left_from > 0)
+    {
+      ti[0] = km->handoff_thread;
+
+      if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
+			 b[0]->flags & VLIB_BUFFER_IS_TRACED))
+	{
+	  ikev2_handoff_trace_t *t =
+	    vlib_add_trace (vm, node, b[0], sizeof (*t));
+	  t->current_worker_index = this_thread;
+	  t->next_worker_index = ti[0];
+	}
+      n_left_from--;
+      ti++;
+      b++;
+    }
+
+  n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from,
+					 thread_indices, frame->n_vectors, 1);
+
+  if (n_enq < frame->n_vectors)
+    vlib_node_increment_counter (vm, node->node_index,
+				 IKEV2_HANDOFF_ERROR_CONGESTION_DROP,
+				 frame->n_vectors - n_enq);
+  return n_enq;
+}
+
+/* Do worker handoff based on the ikev2's thread_index */
+VLIB_NODE_FN (ikev2_ip4_handoff)
+(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
+{
+  ikev2_main_t *km = &ikev2_main;
+
+  return ikev2_handoff_inline (vm, node, from_frame, km->handoff_ip4_fq_index);
+}
+
+VLIB_NODE_FN (ikev2_ip4_natt_handoff)
+(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
+{
+  ikev2_main_t *km = &ikev2_main;
+
+  return ikev2_handoff_inline (vm, node, from_frame,
+			       km->handoff_ip4_natt_fq_index);
+}
+
+VLIB_NODE_FN (ikev2_ip6_handoff)
+(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
+{
+  ikev2_main_t *km = &ikev2_main;
+
+  return ikev2_handoff_inline (vm, node, from_frame, km->handoff_ip6_fq_index);
+}
+
+VLIB_REGISTER_NODE (ikev2_ip4_handoff) = {
+  .name = "ikev2-ip4-handoff",
+  .vector_size = sizeof (u32),
+  .format_trace = format_ikev2_handoff_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .n_errors = ARRAY_LEN(ikev2_handoff_error_strings),
+  .error_strings = ikev2_handoff_error_strings,
+  .n_next_nodes = 1,
+  .next_nodes = {
+    [0] = "error-drop",
+  },
+};
+
+VLIB_REGISTER_NODE (ikev2_ip4_natt_handoff) = {
+  .name = "ikev2-ip4-natt-handoff",
+  .vector_size = sizeof (u32),
+  .format_trace = format_ikev2_handoff_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .n_errors = ARRAY_LEN(ikev2_handoff_error_strings),
+  .error_strings = ikev2_handoff_error_strings,
+  .n_next_nodes = 1,
+  .next_nodes = {
+    [0] = "error-drop",
+  },
+};
+
+VLIB_REGISTER_NODE (ikev2_ip6_handoff) = {
+  .name = "ikev2-ip6-handoff",
+  .vector_size = sizeof (u32),
+  .format_trace = format_ikev2_handoff_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .n_errors = ARRAY_LEN(ikev2_handoff_error_strings),
+  .error_strings = ikev2_handoff_error_strings,
+  .n_next_nodes = 1,
+  .next_nodes = {
+    [0] = "error-drop",
+  },
+};