NAT: Refactoring / Housekeeping (VPP-1415)

Change-Id: Ia3ce24cc94f9b2fb331ad62a4181ddcd41bc78ca
Signed-off-by: Matus Fabian <matfabia@cisco.com>

1 files changed, 229 insertions, 0 deletions

diff --git a/src/plugins/nat/nat44_handoff.c b/src/plugins/nat/nat44_handoff.c
new file mode 100644
index 00000000000..a49b8de658f
--- /dev/null
+++ b/src/plugins/nat/nat44_handoff.c
@@ -0,0 +1,229 @@
+/*
+ * Copyright (c) 2018 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.
+ */
+/**
+ * @file
+ * @brief NAT44 worker handoff
+ */
+
+#include <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <vnet/handoff.h>
+#include <vnet/fib/ip4_fib.h>
+#include <vppinfra/error.h>
+#include <nat/nat.h>
+
+typedef struct
+{
+  u32 next_worker_index;
+  u8 in2out;
+} nat44_handoff_trace_t;
+
+#define foreach_nat44_handoff_error                       \
+_(CONGESTION_DROP, "congestion drop")
+
+typedef enum
+{
+#define _(sym,str) NAT44_HANDOFF_ERROR_##sym,
+  foreach_nat44_handoff_error
+#undef _
+    NAT44_HANDOFF_N_ERROR,
+} nat44_handoff_error_t;
+
+static char *nat44_handoff_error_strings[] = {
+#define _(sym,string) string,
+  foreach_nat44_handoff_error
+#undef _
+};
+
+
+vlib_node_registration_t snat_in2out_worker_handoff_node;
+vlib_node_registration_t snat_in2out_output_worker_handoff_node;
+vlib_node_registration_t snat_out2in_worker_handoff_node;
+
+static u8 *
+format_nat44_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 *);
+  nat44_handoff_trace_t *t = va_arg (*args, nat44_handoff_trace_t *);
+  char *tag;
+
+  tag = t->in2out ? "IN2OUT" : "OUT2IN";
+  s =
+    format (s, "NAT44_%s_WORKER_HANDOFF: next-worker %d", tag,
+	    t->next_worker_index);
+
+  return s;
+}
+
+static inline uword
+nat44_worker_handoff_fn_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
+				vlib_frame_t * frame, u8 is_output,
+				u8 is_in2out)
+{
+  snat_main_t *sm = &snat_main;
+  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
+  u32 n_enq, n_left_from, *from;
+  u16 thread_indices[VLIB_FRAME_SIZE], *ti;
+  u32 fq_index;
+  snat_get_worker_function_t *get_worker;
+
+  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;
+
+  ASSERT (vec_len (sm->workers));
+
+  if (is_in2out)
+    {
+      get_worker = sm->worker_in2out_cb;
+      if (is_output)
+	fq_index = sm->fq_in2out_output_index;
+      else
+	fq_index = sm->fq_in2out_index;
+    }
+  else
+    {
+      fq_index = sm->fq_out2in_index;
+      get_worker = sm->worker_out2in_cb;
+    }
+
+  while (n_left_from > 0)
+    {
+      u32 sw_if_index0;
+      u32 rx_fib_index0;
+      ip4_header_t *ip0;
+
+      sw_if_index0 = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
+      rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0);
+      ip0 = vlib_buffer_get_current (b[0]);
+      ti[0] = get_worker (ip0, rx_fib_index0);
+
+      if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+			 && (b[0]->flags & VLIB_BUFFER_IS_TRACED)))
+	{
+	  nat44_handoff_trace_t *t =
+	    vlib_add_trace (vm, node, b[0], sizeof (*t));
+	  t->next_worker_index = ti[0];
+	  t->in2out = is_in2out;
+	}
+
+      n_left_from -= 1;
+      ti += 1;
+      b += 1;
+    }
+
+  n_enq =
+    vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices,
+				   frame->n_vectors, 1);
+
+  if (n_enq < frame->n_vectors)
+    vlib_node_increment_counter (vm, node->node_index,
+				 NAT44_HANDOFF_ERROR_CONGESTION_DROP,
+				 frame->n_vectors - n_enq);
+  return frame->n_vectors;
+}
+
+static uword
+snat_in2out_worker_handoff_fn (vlib_main_t * vm,
+			       vlib_node_runtime_t * node,
+			       vlib_frame_t * frame)
+{
+  return nat44_worker_handoff_fn_inline (vm, node, frame, 0, 1);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (snat_in2out_worker_handoff_node) = {
+  .function = snat_in2out_worker_handoff_fn,
+  .name = "nat44-in2out-worker-handoff",
+  .vector_size = sizeof (u32),
+  .format_trace = format_nat44_handoff_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .n_errors = ARRAY_LEN(nat44_handoff_error_strings),
+  .error_strings = nat44_handoff_error_strings,
+  .n_next_nodes = 1,
+  .next_nodes = {
+    [0] = "error-drop",
+  },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_worker_handoff_node,
+			      snat_in2out_worker_handoff_fn);
+
+static uword
+snat_in2out_output_worker_handoff_fn (vlib_main_t * vm,
+				      vlib_node_runtime_t * node,
+				      vlib_frame_t * frame)
+{
+  return nat44_worker_handoff_fn_inline (vm, node, frame, 1, 1);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (snat_in2out_output_worker_handoff_node) = {
+  .function = snat_in2out_output_worker_handoff_fn,
+  .name = "nat44-in2out-output-worker-handoff",
+  .vector_size = sizeof (u32),
+  .format_trace = format_nat44_handoff_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .n_errors = ARRAY_LEN(nat44_handoff_error_strings),
+  .error_strings = nat44_handoff_error_strings,
+  .n_next_nodes = 1,
+  .next_nodes = {
+    [0] = "error-drop",
+  },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_output_worker_handoff_node,
+			      snat_in2out_output_worker_handoff_fn);
+
+static uword
+snat_out2in_worker_handoff_fn (vlib_main_t * vm,
+			       vlib_node_runtime_t * node,
+			       vlib_frame_t * frame)
+{
+  return nat44_worker_handoff_fn_inline (vm, node, frame, 0, 0);
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (snat_out2in_worker_handoff_node) = {
+  .function = snat_out2in_worker_handoff_fn,
+  .name = "nat44-out2in-worker-handoff",
+  .vector_size = sizeof (u32),
+  .format_trace = format_nat44_handoff_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+  .n_errors = ARRAY_LEN(nat44_handoff_error_strings),
+  .error_strings = nat44_handoff_error_strings,
+  .n_next_nodes = 1,
+  .next_nodes = {
+    [0] = "error-drop",
+  },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (snat_out2in_worker_handoff_node,
+			      snat_out2in_worker_handoff_fn);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */