qos: Store function

Type: feature

store: write a QoS value into the buffer meta-data
record: Extract a QoS value from a packet header and store it.
mark: Make a change to the content of a packet header by writing a stored
      QoS value

Change-Id: I07d1e87dd1ca90d40ac1ae1774fee1b272cab83f
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 179 insertions, 0 deletions

diff --git a/src/vnet/qos/qos_store_node.c b/src/vnet/qos/qos_store_node.c
new file mode 100644
index 00000000000..2273b2eac77
--- /dev/null
+++ b/src/vnet/qos/qos_store_node.c
@@ -0,0 +1,179 @@
+/*
+ * 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.
+ */
+
+#include <vnet/qos/qos_store.h>
+#include <vnet/ip/ip.h>
+#include <vnet/ip/ip6_to_ip4.h>
+#include <vnet/feature/feature.h>
+#include <vnet/qos/qos_types.h>
+
+extern u8 *qos_store_configs[QOS_N_SOURCES];
+
+/**
+ * per-packet trace data
+ */
+typedef struct qos_store_trace_t_
+{
+  /* per-pkt trace data */
+  qos_bits_t bits;
+} qos_store_trace_t;
+
+/* packet trace format function */
+static u8 *
+format_qos_store_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 *);
+  qos_store_trace_t *t = va_arg (*args, qos_store_trace_t *);
+
+  s = format (s, "qos:%d", t->bits);
+
+  return s;
+}
+
+static inline uword
+qos_store_inline (vlib_main_t * vm,
+		  vlib_node_runtime_t * node,
+		  vlib_frame_t * frame, qos_source_t qos_src)
+{
+  u32 n_left_from, *from, *to_next, next_index;
+
+  next_index = 0;
+  n_left_from = frame->n_vectors;
+  from = vlib_frame_vector_args (frame);
+
+  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 > 0 && n_left_to_next > 0)
+	{
+	  vlib_buffer_t *b0;
+	  u32 next0, bi0;
+	  qos_bits_t qos0;
+
+	  next0 = 0;
+	  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);
+
+	  qos0 =
+	    *(qos_bits_t *) vnet_feature_next_with_data (&next0, b0,
+							 sizeof (qos_bits_t));
+
+	  vnet_buffer2 (b0)->qos.bits = qos0;
+	  vnet_buffer2 (b0)->qos.source = qos_src;
+	  b0->flags |= VNET_BUFFER_F_QOS_DATA_VALID;
+
+	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
+			     (b0->flags & VLIB_BUFFER_IS_TRACED)))
+	    {
+	      qos_store_trace_t *t =
+		vlib_add_trace (vm, node, b0, sizeof (*t));
+	      t->bits = qos0;
+	    }
+
+
+	  /* verify speculative enqueue, maybe switch current next frame */
+	  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 frame->n_vectors;
+}
+
+
+VLIB_NODE_FN (ip4_qos_store_node) (vlib_main_t * vm,
+				   vlib_node_runtime_t * node,
+				   vlib_frame_t * frame)
+{
+  return (qos_store_inline (vm, node, frame, QOS_SOURCE_IP));
+}
+
+VLIB_NODE_FN (ip6_qos_store_node) (vlib_main_t * vm,
+				   vlib_node_runtime_t * node,
+				   vlib_frame_t * frame)
+{
+  return (qos_store_inline (vm, node, frame, QOS_SOURCE_IP));
+}
+
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip4_qos_store_node) = {
+  .name = "ip4-qos-store",
+  .vector_size = sizeof (u32),
+  .format_trace = format_qos_store_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = 0,
+  .n_next_nodes = 1,
+
+  .next_nodes = {
+    [0] = "ip4-drop",
+  },
+};
+
+VNET_FEATURE_INIT (ip4_qos_store_node, static) = {
+    .arc_name = "ip4-unicast",
+    .node_name = "ip4-qos-store",
+};
+VNET_FEATURE_INIT (ip4m_qos_store_node, static) = {
+    .arc_name = "ip4-multicast",
+    .node_name = "ip4-qos-store",
+};
+
+VLIB_REGISTER_NODE (ip6_qos_store_node) = {
+  .name = "ip6-qos-store",
+  .vector_size = sizeof (u32),
+  .format_trace = format_qos_store_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = 0,
+  .n_next_nodes = 1,
+
+  .next_nodes = {
+    [0] = "ip6-drop",
+  },
+};
+
+VNET_FEATURE_INIT (ip6_qos_store_node, static) = {
+    .arc_name = "ip6-unicast",
+    .node_name = "ip6-qos-store",
+};
+VNET_FEATURE_INIT (ip6m_qos_store_node, static) = {
+    .arc_name = "ip6-multicast",
+    .node_name = "ip6-qos-store",
+};
+
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */