QoS recording and marking

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

1 files changed, 447 insertions, 0 deletions

diff --git a/src/vnet/qos/qos_mark.c b/src/vnet/qos/qos_mark.c
new file mode 100644
index 00000000000..cec7192b018
--- /dev/null
+++ b/src/vnet/qos/qos_mark.c
@@ -0,0 +1,447 @@
+/*
+ * 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/ip/ip.h>
+#include <vnet/feature/feature.h>
+#include <vnet/qos/qos_egress_map.h>
+#include <vnet/qos/qos_mark.h>
+
+/**
+ * per-interface vector of which MAP is used by which interface
+ * for each output source
+ */
+index_t *qos_mark_configs[QOS_N_SOURCES];
+
+void
+qos_mark_ip_enable_disable (u32 sw_if_index, u8 enable)
+{
+  vnet_feature_enable_disable ("ip6-output", "ip6-qos-mark",
+			       sw_if_index, enable, NULL, 0);
+  vnet_feature_enable_disable ("ip4-output", "ip4-qos-mark",
+			       sw_if_index, enable, NULL, 0);
+}
+
+void
+qos_mark_vlan_enable_disable (u32 sw_if_index, u8 enable)
+{
+  vnet_feature_enable_disable ("interface-output", "vlan-qos-mark",
+			       sw_if_index, enable, NULL, 0);
+}
+
+void
+qos_mark_mpls_enable_disable (u32 sw_if_index, u8 enable)
+{
+  vnet_feature_enable_disable ("mpls-output", "mpls-qos-mark",
+			       sw_if_index, enable, NULL, 0);
+}
+
+static void
+qos_egress_map_feature_config (u32 sw_if_index, qos_source_t qs, u8 enable)
+{
+  switch (qs)
+    {
+    case QOS_SOURCE_EXT:
+      ASSERT (0);
+      break;
+    case QOS_SOURCE_VLAN:
+      qos_mark_vlan_enable_disable (sw_if_index, enable);
+      break;
+    case QOS_SOURCE_MPLS:
+      qos_mark_mpls_enable_disable (sw_if_index, enable);
+      break;
+    case QOS_SOURCE_IP:
+      qos_mark_ip_enable_disable (sw_if_index, enable);
+      break;
+    }
+}
+
+always_inline qos_egress_map_t *
+qos_egress_map_interface (u32 sw_if_index, qos_source_t output_source)
+{
+  ASSERT (vec_len (qos_mark_configs[output_source]) > sw_if_index);
+
+  return pool_elt_at_index (qem_pool,
+			    qos_mark_configs[output_source][sw_if_index]);
+}
+
+/**
+ * per-packet trace data
+ */
+typedef struct qos_mark_trace_t_
+{
+  /* per-pkt trace data */
+  qos_bits_t bits;
+  qos_source_t input;
+  u32 used;
+} qos_mark_trace_t;
+
+static inline uword
+qos_mark_inline (vlib_main_t * vm,
+		 vlib_node_runtime_t * node,
+		 vlib_frame_t * frame, qos_source_t output_source, 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)
+	{
+	  qos_source_t input_source0;
+	  ethernet_vlan_header_t *vlan0;
+	  u32 sw_if_index0, next0, bi0;
+	  qos_egress_map_t *qem0;
+	  ip4_header_t *ip4_0;
+	  ip6_header_t *ip6_0;
+	  vlib_buffer_t *b0;
+	  qos_bits_t qos0;
+	  u8 *mpls_bytes_0;
+	  u8 eos0;
+
+	  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);
+	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
+	  input_source0 = vnet_buffer2 (b0)->qos.source;
+
+	  qem0 = qos_egress_map_interface (sw_if_index0, output_source);
+	  qos0 = qem0->qem_output[input_source0][vnet_buffer2 (b0)->qos.bits];
+
+	  if (PREDICT_TRUE (b0->flags & VNET_BUFFER_F_QOS_DATA_VALID))
+	    {
+	      /* there is a source of QoS recording for this packet */
+	      if (QOS_SOURCE_IP == output_source)
+		{
+		  if (is_ip6)
+		    {
+		      ip6_0 = (vlib_buffer_get_current (b0) +
+			       vnet_buffer (b0)->ip.save_rewrite_length);
+
+		      ip6_set_traffic_class_network_order (ip6_0, qos0);
+		    }
+		  else
+		    {
+		      ip4_0 = (vlib_buffer_get_current (b0) +
+			       vnet_buffer (b0)->ip.save_rewrite_length);
+		      if (PREDICT_FALSE (qos0 != ip4_0->tos))
+			{
+			  ip4_0->tos = qos0;
+			  ip4_0->checksum = ip4_header_checksum (ip4_0);
+			}
+		    }
+		}
+	      else if (QOS_SOURCE_MPLS == output_source)
+		{
+		  mpls_bytes_0 = (vlib_buffer_get_current (b0) +
+				  vnet_buffer (b0)->mpls.save_rewrite_length);
+
+		  /* apply to all the labels in the stack */
+		  do
+		    {
+		      /* clear out the old COS bts */
+		      mpls_bytes_0[2] &= 0xf1;
+		      /* OR in 3 bits of the mapped value */
+		      mpls_bytes_0[2] |= (qos0 & 0x7) << 1;
+		      eos0 = mpls_bytes_0[2] & 0x1;
+		      mpls_bytes_0 += 4;
+		    }
+		  while (!eos0);
+		}
+	      else if (QOS_SOURCE_VLAN == output_source)
+		{
+		  vlan0 = (vlib_buffer_get_current (b0) +
+			   sizeof (ethernet_header_t));
+
+		  ethernet_vlan_header_set_priority_net_order (vlan0, qos0);
+		}
+	    }
+	  vnet_feature_next (sw_if_index0, &next0, b0);
+
+	  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+	    {
+	      qos_mark_trace_t *t =
+		vlib_add_trace (vm, node, b0, sizeof (*t));
+	      t->bits = qos0;
+	      t->input = input_source0;
+	      t->used = (b0->flags & VNET_BUFFER_F_QOS_DATA_VALID);
+	    }
+
+	  /* 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_mark_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_mark_trace_t *t = va_arg (*args, qos_mark_trace_t *);
+
+  s = format (s, "source:%U qos:%d used:%s",
+	      format_qos_source, t->input, t->bits, (t->used ? "yes" : "no"));
+
+  return s;
+}
+
+static inline uword
+ip4_qos_mark (vlib_main_t * vm, vlib_node_runtime_t * node,
+	      vlib_frame_t * frame)
+{
+  return (qos_mark_inline (vm, node, frame, QOS_SOURCE_IP, 0));
+}
+
+static inline uword
+ip6_qos_mark (vlib_main_t * vm, vlib_node_runtime_t * node,
+	      vlib_frame_t * frame)
+{
+  return (qos_mark_inline (vm, node, frame, QOS_SOURCE_IP, 1));
+}
+
+static inline uword
+mpls_qos_mark (vlib_main_t * vm, vlib_node_runtime_t * node,
+	       vlib_frame_t * frame)
+{
+  return (qos_mark_inline (vm, node, frame, QOS_SOURCE_MPLS, 0));
+}
+
+static inline uword
+vlan_qos_mark (vlib_main_t * vm, vlib_node_runtime_t * node,
+	       vlib_frame_t * frame)
+{
+  return (qos_mark_inline (vm, node, frame, QOS_SOURCE_VLAN, 0));
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ip4_qos_mark_node) = {
+  .function = ip4_qos_mark,
+  .name = "ip4-qos-mark",
+  .vector_size = sizeof (u32),
+  .format_trace = format_qos_mark_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = 0,
+  .n_next_nodes = 1,
+
+  .next_nodes = {
+    [0] = "ip4-drop",
+  },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (ip4_qos_mark_node, ip4_qos_mark);
+
+VNET_FEATURE_INIT (ip4_qos_mark_node, static) = {
+    .arc_name = "ip4-output",
+    .node_name = "ip4-qos-mark",
+};
+
+VLIB_REGISTER_NODE (ip6_qos_mark_node) = {
+  .function = ip6_qos_mark,
+  .name = "ip6-qos-mark",
+  .vector_size = sizeof (u32),
+  .format_trace = format_qos_mark_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = 0,
+  .n_next_nodes = 1,
+
+  .next_nodes = {
+    [0] = "ip6-drop",
+  },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (ip6_qos_mark_node, ip6_qos_mark);
+
+VNET_FEATURE_INIT (ip6_qos_mark_node, static) = {
+    .arc_name = "ip6-output",
+    .node_name = "ip6-qos-mark",
+};
+
+VLIB_REGISTER_NODE (mpls_qos_mark_node) = {
+  .function = mpls_qos_mark,
+  .name = "mpls-qos-mark",
+  .vector_size = sizeof (u32),
+  .format_trace = format_qos_mark_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = 0,
+  .n_next_nodes = 1,
+
+  .next_nodes = {
+    [0] = "mpls-drop",
+  },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (mpls_qos_mark_node, mpls_qos_mark);
+
+VNET_FEATURE_INIT (mpls_qos_mark_node, static) = {
+    .arc_name = "mpls-output",
+    .node_name = "mpls-qos-mark",
+};
+VLIB_REGISTER_NODE (vlan_qos_mark_node) = {
+  .function = vlan_qos_mark,
+  .name = "vlan-qos-mark",
+  .vector_size = sizeof (u32),
+  .format_trace = format_qos_mark_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = 0,
+  .n_next_nodes = 1,
+
+  .next_nodes = {
+    [0] = "error-drop",
+  },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (vlan_qos_mark_node, vlan_qos_mark);
+
+VNET_FEATURE_INIT (vlan_qos_mark_node, static) = {
+    .arc_name = "interface-output",
+    .node_name = "vlan-qos-mark",
+};
+/* *INDENT-ON* */
+
+int
+qos_mark_enable (u32 sw_if_index,
+		 qos_source_t output_source, qos_egress_map_id_t mid)
+{
+  index_t qemi;
+
+  vec_validate_init_empty (qos_mark_configs[output_source],
+			   sw_if_index, INDEX_INVALID);
+
+  qemi = qos_egress_map_find (mid);
+
+  if (INDEX_INVALID == qemi)
+    return VNET_API_ERROR_NO_SUCH_TABLE;
+
+  if (INDEX_INVALID == qos_mark_configs[output_source][sw_if_index])
+    {
+      qos_egress_map_feature_config (sw_if_index, output_source, 1);
+    }
+
+  qos_mark_configs[output_source][sw_if_index] = qemi;
+
+  return (0);
+}
+
+int
+qos_mark_disable (u32 sw_if_index, qos_source_t output_source)
+{
+  if (vec_len (qos_mark_configs[output_source]) < sw_if_index)
+    return VNET_API_ERROR_NO_MATCHING_INTERFACE;
+  if (INDEX_INVALID == qos_mark_configs[output_source][sw_if_index])
+    return VNET_API_ERROR_VALUE_EXIST;
+
+  if (INDEX_INVALID != qos_mark_configs[output_source][sw_if_index])
+    {
+      qos_egress_map_feature_config (sw_if_index, output_source, 0);
+    }
+
+  qos_mark_configs[output_source][sw_if_index] = INDEX_INVALID;
+
+  return (0);
+}
+
+static clib_error_t *
+qos_mark_cli (vlib_main_t * vm,
+	      unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+  qos_egress_map_id_t map_id;
+  u32 sw_if_index, qs;
+  vnet_main_t *vnm;
+  int rv, enable;
+
+  vnm = vnet_get_main ();
+  map_id = ~0;
+  qs = 0xff;
+  enable = 1;
+
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (input, "id %d", &map_id))
+	;
+      else if (unformat (input, "disable"))
+	enable = 0;
+      else if (unformat (input, "%U", unformat_qos_source, &qs))
+	;
+      else if (unformat (input, "%U",
+			 unformat_vnet_sw_interface, vnm, &sw_if_index))
+	;
+      else
+	break;
+    }
+
+  if (~0 == sw_if_index)
+    return clib_error_return (0, "interface must be specified");
+  if (0xff == qs)
+    return clib_error_return (0, "output location must be specified");
+
+  if (enable)
+    rv = qos_mark_enable (sw_if_index, qs, map_id);
+  else
+    rv = qos_mark_disable (sw_if_index, qs);
+
+  if (0 == rv)
+    return (NULL);
+
+  return clib_error_return (0, "Failed to map interface");
+}
+
+/*?
+ * Apply a QoS egress mapping table to an interface for QoS marking packets
+ * at the given output protocol.
+ *
+ * @cliexpar
+ * @cliexcmd{qos egress interface GigEthernet0/9/0 id 0 output ip}
+ ?*/
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (qos_egress_map_interface_command, static) = {
+  .path = "qos mark",
+  .short_help = "qos mark <SOURCE> <INTERFACE> id <MAP>",
+  .function = qos_mark_cli,
+  .is_mp_safe = 1,
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+* Local Variables:
+* eval: (c-set-style "gnu")
+* End:
+*
+*/