QoS recording and marking

Change-Id: Ie5a50def4ec1e4a3b3404a8b6ab9ec248bc16744
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 326 insertions, 0 deletions

diff --git a/src/vnet/qos/qos_record.c b/src/vnet/qos/qos_record.c
new file mode 100644
index 00000000000..047bd25cda4
--- /dev/null
+++ b/src/vnet/qos/qos_record.c
@@ -0,0 +1,326 @@
+/*
+ * 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_record.h>
+#include <vnet/ip/ip.h>
+#include <vnet/ip/ip6_to_ip4.h>
+#include <vnet/feature/feature.h>
+#include <vnet/qos/qos_types.h>
+
+/**
+ * Per-interface, per-protocol vector of feature on/off configurations
+ */
+static u8 *qos_record_configs[QOS_N_SOURCES];
+
+static void
+qos_record_feature_config (u32 sw_if_index,
+			   qos_source_t input_source, u8 enable)
+{
+  switch (input_source)
+    {
+    case QOS_SOURCE_IP:
+      vnet_feature_enable_disable ("ip6-unicast", "ip6-qos-record",
+				   sw_if_index, enable, NULL, 0);
+      vnet_feature_enable_disable ("ip6-multicast", "ip6-qos-record",
+				   sw_if_index, enable, NULL, 0);
+      vnet_feature_enable_disable ("ip4-unicast", "ip4-qos-record",
+				   sw_if_index, enable, NULL, 0);
+      vnet_feature_enable_disable ("ip4-multicast", "ip4-qos-record",
+				   sw_if_index, enable, NULL, 0);
+      break;
+    case QOS_SOURCE_MPLS:
+    case QOS_SOURCE_VLAN:
+    case QOS_SOURCE_EXT:
+      // not implemented yet
+      break;
+    }
+}
+
+int
+qos_record_enable (u32 sw_if_index, qos_source_t input_source)
+{
+  vec_validate (qos_record_configs[input_source], sw_if_index);
+
+  if (0 == qos_record_configs[input_source][sw_if_index])
+    {
+      qos_record_feature_config (sw_if_index, input_source, 1);
+    }
+
+  qos_record_configs[input_source][sw_if_index]++;
+  return (0);
+}
+
+int
+qos_record_disable (u32 sw_if_index, qos_source_t input_source)
+{
+  if (vec_len (qos_record_configs[input_source]) < sw_if_index)
+    return VNET_API_ERROR_NO_MATCHING_INTERFACE;
+
+  if (0 == qos_record_configs[input_source][sw_if_index])
+    return VNET_API_ERROR_VALUE_EXIST;
+
+  qos_record_configs[input_source][sw_if_index]--;
+
+  if (0 == qos_record_configs[input_source][sw_if_index])
+    {
+      qos_record_feature_config (sw_if_index, input_source, 0);
+    }
+
+  return (0);
+}
+
+/*
+ * Disable recording feautre for all protocols when the interface
+ * is deleted
+ */
+static clib_error_t *
+qos_record_ip_interface_add_del (vnet_main_t * vnm,
+				 u32 sw_if_index, u32 is_add)
+{
+  if (!is_add)
+    {
+      qos_source_t qs;
+
+      FOR_EACH_QOS_SOURCE (qs)
+      {
+	qos_record_disable (sw_if_index, qs);
+      }
+    }
+
+  return (NULL);
+}
+
+VNET_SW_INTERFACE_ADD_DEL_FUNCTION (qos_record_ip_interface_add_del);
+
+/**
+ * per-packet trace data
+ */
+typedef struct qos_record_trace_t_
+{
+  /* per-pkt trace data */
+  qos_bits_t bits;
+} qos_record_trace_t;
+
+static inline uword
+qos_record_inline (vlib_main_t * vm,
+		   vlib_node_runtime_t * node,
+		   vlib_frame_t * frame, int is_ip6)
+{
+  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)
+	{
+	  ip4_header_t *ip4_0;
+	  ip6_header_t *ip6_0;
+	  vlib_buffer_t *b0;
+	  u32 sw_if_index0, 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);
+	  if (is_ip6)
+	    {
+	      ip6_0 = vlib_buffer_get_current (b0);
+	      qos0 = ip6_traffic_class_network_order (ip6_0);
+	    }
+	  else
+	    {
+	      ip4_0 = vlib_buffer_get_current (b0);
+	      qos0 = ip4_0->tos;
+	    }
+	  vnet_buffer2 (b0)->qos.bits = qos0;
+	  vnet_buffer2 (b0)->qos.source = QOS_SOURCE_IP;
+	  b0->flags |= VNET_BUFFER_F_QOS_DATA_VALID;
+	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+
+	  vnet_feature_next (sw_if_index0, &next0, b0);
+
+	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
+			     (b0->flags & VLIB_BUFFER_IS_TRACED)))
+	    {
+	      qos_record_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;
+}
+
+/* packet trace format function */
+static u8 *
+format_qos_record_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_record_trace_t *t = va_arg (*args, qos_record_trace_t *);
+
+  s = format (s, "qos:%d", t->bits);
+
+  return s;
+}
+
+static inline uword
+ip4_qos_record (vlib_main_t * vm, vlib_node_runtime_t * node,
+		vlib_frame_t * frame)
+{
+  return (qos_record_inline (vm, node, frame, 0));
+}
+
+static inline uword
+ip6_qos_record (vlib_main_t * vm, vlib_node_runtime_t * node,
+		vlib_frame_t * frame)
+{
+  return (qos_record_inline (vm, node, frame, 1));
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip4_qos_record_node) = {
+  .function = ip4_qos_record,
+  .name = "ip4-qos-record",
+  .vector_size = sizeof (u32),
+  .format_trace = format_qos_record_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = 0,
+  .n_next_nodes = 1,
+
+  .next_nodes = {
+    [0] = "ip4-drop",
+  },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (ip4_qos_record_node, ip4_qos_record);
+
+VNET_FEATURE_INIT (ip4_qos_record_node, static) = {
+    .arc_name = "ip4-unicast",
+    .node_name = "ip4-qos-record",
+};
+
+VLIB_REGISTER_NODE (ip6_qos_record_node) = {
+  .function = ip6_qos_record,
+  .name = "ip6-qos-record",
+  .vector_size = sizeof (u32),
+  .format_trace = format_qos_record_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = 0,
+  .n_next_nodes = 1,
+
+  .next_nodes = {
+    [0] = "ip6-drop",
+  },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (ip6_qos_record_node, ip6_qos_record);
+
+VNET_FEATURE_INIT (ip6_qos_record_node, static) = {
+    .arc_name = "ip6-unicast",
+    .node_name = "ip6-qos-record",
+};
+/* *INDENT-ON* */
+
+
+static clib_error_t *
+qos_record_cli (vlib_main_t * vm,
+		unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+  vnet_main_t *vnm = vnet_get_main ();
+  u32 sw_if_index, qs;
+  u8 enable;
+
+  qs = 0xff;
+  enable = 1;
+  sw_if_index = ~0;
+
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (input, "%U", unformat_vnet_sw_interface,
+		    vnm, &sw_if_index))
+	;
+      else if (unformat (input, "%U", unformat_qos_source, &qs))
+	;
+      else if (unformat (input, "enable"))
+	enable = 1;
+      else if (unformat (input, "disable"))
+	enable = 0;
+      else
+	break;
+    }
+
+  if (~0 == sw_if_index)
+    return clib_error_return (0, "interface must be specified");
+  if (0xff == qs)
+    return clib_error_return (0, "input location must be specified");
+
+  if (enable)
+    qos_record_enable (sw_if_index, qs);
+  else
+    qos_record_disable (sw_if_index, qs);
+
+  return (NULL);
+}
+
+/*?
+ * Enable QoS bit recording on an interface using the packet's input DSCP bits
+ * Which input QoS bits to use are either; IP, MPLS or VLAN. If more than
+ * one protocol is chosen (which is foolish) the higer layers override the
+ * lower.
+ *
+ * @cliexpar
+ * @cliexcmd{qos record ip GigEthernet0/1/0}
+ ?*/
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (qos_record_command, static) = {
+  .path = "qos record",
+  .short_help = "qos record <record-source> <INTERFACE> [disable]",
+  .function = qos_record_cli,
+  .is_mp_safe = 1,
+};
+/* *INDENT-ON* */
+
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */