diff --git a/ci/travis.sh b/ci/travis.sh
index 836916c..72e1d65 100644
--- a/ci/travis.sh
+++ b/ci/travis.sh
@@ -41,7 +41,6 @@ yum install -y libMESA_prof_load-devel
 yum install -y libMESA_field_stat2-devel
 yum install -y librulescan-devel
 yum install -y sapp-devel # Maat_rule require MESA/stream.h
-yum install -y libasan
 yum install -y numactl-libs # required by mrzcpd
 yum install -y libibverbs # required by mrzcpd
 
diff --git a/platform/src/packet_io.cpp b/platform/src/packet_io.cpp
index 1681a86..c5b21f1 100644
--- a/platform/src/packet_io.cpp
+++ b/platform/src/packet_io.cpp
@@ -133,9 +133,11 @@ static enum raw_pkt_action handle_raw_packet(struct packet_io *handle, marsio_bu
 // return : INJT_PKT_HIT_FWD2NF
 static enum inject_pkt_action handle_inject_packet(struct packet_io *handle, marsio_buff_t *rx_buff, int thread_seq, void *ctx, int *action_bytes);
 
+// rx_buff   : not include g_vxlan header
 // return  + : send n bytes
 // return -1 : error
 static int forward_packet_to_sf(struct packet_io *handle, marsio_buff_t *rx_buff, struct metadata *meta, struct selected_sf *sf, int thread_seq, void *ctx);
+// rx_buff   : include g_vxlan header
 // return  + : send n bytes
 // return -1 : error
 static int forward_packet_to_nf(struct packet_io *handle, marsio_buff_t *rx_buff, struct metadata *meta, int thread_seq, void *ct);
@@ -765,6 +767,9 @@ static enum raw_pkt_action handle_raw_packet(struct packet_io *handle, marsio_bu
                 return RAW_PKT_ERR_BYPASS;
             }
 
+            // rx_buff   : not include g_vxlan header
+            // return  + : send n bytes
+            // return -1 : error
             nsend = forward_packet_to_sf(handle, rx_buff, &meta, node, thread_seq, ctx);
             if (nsend > 0)
             {
@@ -897,7 +902,11 @@ static enum inject_pkt_action handle_inject_packet(struct packet_io *handle, mar
                 *action_bytes = raw_len;
                 return INJT_PKT_ERR_DROP;
             }
+            marsio_buff_adj(rx_buff, raw_len - meta.raw_len);
 
+            // rx_buff   : not include g_vxlan header
+            // return  + : send n bytes
+            // return -1 : error
             nsend = forward_packet_to_sf(handle, rx_buff, &meta, node, thread_seq, ctx);
             if (nsend > 0)
             {
@@ -928,6 +937,9 @@ static enum inject_pkt_action handle_inject_packet(struct packet_io *handle, mar
     }
     else
     {
+        // rx_buff   : include g_vxlan header
+        // return  + : send n bytes
+        // return -1 : error
         int nsend = forward_packet_to_nf(handle, rx_buff, &meta, thread_seq, ctx);
         if (nsend > 0)
         {
@@ -944,6 +956,7 @@ static enum inject_pkt_action handle_inject_packet(struct packet_io *handle, mar
     }
 }
 
+// rx_buff   : not include g_vxlan header
 // return  + : send n bytes
 // return -1 : error
 static int forward_packet_to_sf(struct packet_io *handle, marsio_buff_t *rx_buff, struct metadata *meta, struct selected_sf *sf, int thread_seq, void *ctx)
@@ -976,7 +989,8 @@ static int forward_packet_to_sf(struct packet_io *handle, marsio_buff_t *rx_buff
     return raw_len;
 }
 
-// return  0 : success
+// rx_buff   : include g_vxlan header
+// return  + : send n bytes
 // return -1 : error
 static int forward_packet_to_nf(struct packet_io *handle, marsio_buff_t *rx_buff, struct metadata *meta, int thread_seq, void *ct)
 {
@@ -1066,6 +1080,9 @@ static int forward_all_nf_packet_to_sf(struct packet_io *handle, marsio_buff_t *
 
     // forward data
 forward:
+    // rx_buff   : not include g_vxlan header
+    // return  + : send n bytes
+    // return -1 : error
     int nsend = forward_packet_to_sf(handle, rx_buff, &meta, sf, thread_seq, ctx);
     if (nsend > 0)
     {
@@ -1138,7 +1155,9 @@ static int forward_all_sf_packet_to_nf(struct packet_io *handle, marsio_buff_t *
         memcpy(meta.route_ctx, s_ctx->raw_pkt_i2e_route_ctx, sizeof(s_ctx->raw_pkt_i2e_route_ctx));
     }
 
-    // sendto nf
+    // rx_buff   : include g_vxlan header
+    // return  + : send n bytes
+    // return -1 : error
     int nsend = forward_packet_to_nf(handle, rx_buff, &meta, thread_seq, ctx);
     if (nsend > 0)
     {
diff --git a/platform/src/policy.cpp b/platform/src/policy.cpp
index 3c365ae..2f04443 100644
--- a/platform/src/policy.cpp
+++ b/platform/src/policy.cpp
@@ -1443,10 +1443,12 @@ void policy_enforce_select_chaining(struct selected_chaining *chaining, struct p
             continue;
         }
         item->sff_forward_type = sff_param->sff_forward_type;
+        LOG_DEBUG("%s: chaining policy %d -> sff_profile %d sf_profile_ids_num %d (before filter nearby and sctive)", LOG_TAG_POLICY, policy_id, item->sff_profile_id, sff_param->sf_profile_ids_num);
 
         memset(&array, 0, sizeof(array));
         fixed_num_array_init(&array);
         select_sf_by_nearby_and_active(enforcer, sff_param, &array);
+        LOG_DEBUG("%s: chaining policy %d -> sff_profile %d sf_profile_ids_num %d (after filter nearby and sctive)", LOG_TAG_POLICY, policy_id, item->sff_profile_id, fixed_num_array_count_elem(&array));
         if (fixed_num_array_count_elem(&array) == 0)
         {
             LOG_DEBUG("%s: chaining policy %d -> sff_profile %d, no sf available after filtering by 'nearby & active', bypass current sff !!!", LOG_TAG_POLICY, policy_id, item->sff_profile_id);
@@ -1459,6 +1461,7 @@ void policy_enforce_select_chaining(struct selected_chaining *chaining, struct p
 
         hash_value = raw_packet_parser_get_hash_value(parser, sff_param->sff_ldbc.method, dir_is_internal);
         item->sf_action = select_sf_by_ldbc(hash_value, sff_param, &array, &(item->sf_profile_id), &(item->sf_action_reason));
+        LOG_DEBUG("%s: chaining policy %d -> sff_profile %d sf_profile_ids_num %d (after filter ldbc)", LOG_TAG_POLICY, policy_id, item->sff_profile_id, fixed_num_array_count_elem(&array));
         if (item->sf_action != SESSION_ACTION_FORWARD)
         {
             chaining->chaining_used++;