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diff --git a/src/vnet/classify/trace_classify.h b/src/vnet/classify/trace_classify.h
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+/*
+ * trace_classify.h - Use the classifier to decide if a packet is traced
+ *
+ * Copyright (c) 2019 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 <vppinfra/error.h>
+#include <vnet/classify/vnet_classify.h>
+
+/** @file trace_classify.h
+ * Use the vpp classifier to decide whether to trace packets
+ */
+
+/** @brief vnet_is_packet_traced
+ * @param vlib_buffer_t *b - packet to classify
+ * @param int func - 0 => use classifier w/ supplied table index
+ * @param u32 classify_table_index - classifier table index
+ * @return 0 => no trace, 1 => trace, -1 => error
+ */
+
+static inline int
+vnet_is_packet_traced_inline (vlib_buffer_t * b,
+ u32 classify_table_index, int func)
+{
+ vnet_classify_main_t *vcm = &vnet_classify_main;
+ vnet_classify_table_t *t;
+ vnet_classify_entry_t *e;
+ u64 hash;
+
+ /*$$$ add custom classifiers here, if any */
+ if (func != 0)
+ return -1;
+
+ /* This will happen... */
+ if (pool_is_free_index (vcm->tables, classify_table_index))
+ return -1;
+
+ /* Get the table */
+ t = pool_elt_at_index (vcm->tables, classify_table_index);
+
+ /* Hash the packet */
+ hash = vnet_classify_hash_packet (t, vlib_buffer_get_current (b));
+
+ /* See if there's a matching entry */
+ e = vnet_classify_find_entry (t, vlib_buffer_get_current (b), hash,
+ 0 /* time = 0, disables hit-counter */ );
+ /* Hit means trace the packet... */
+ if (e)
+ {
+ /* Manual hit accounting */
+ e->hits++;
+ return 1;
+ }
+
+ /*
+ * Look for a hit in a less-specific table.
+ * Performance hint: for this use-case, don't go there.
+ */
+ while (1)
+ {
+ /* Most likely, we're done right now */
+ if (PREDICT_TRUE (t->next_table_index == ~0))
+ return 0;
+ t = pool_elt_at_index (vcm->tables, t->next_table_index);
+
+ /* Compute hash for this table */
+ hash = vnet_classify_hash_packet (t, vlib_buffer_get_current (b));
+
+ /* See if there's a matching entry */
+ e = vnet_classify_find_entry (t, vlib_buffer_get_current (b), hash,
+ 0 /* time = 0, disables hit-counter */ );
+ if (e)
+ {
+ /* Manual hit accounting */
+ e->hits++;
+ return 1;
+ }
+ }
+ /* NOTREACHED */
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */