diff --git a/common/common_defines.h b/common/common_defines.h
index e35f49a..05cd539 100644
--- a/common/common_defines.h
+++ b/common/common_defines.h
@@ -94,7 +94,7 @@ struct ingressinfo {
 
 #define PORT_AVAILABLE 1024
 
-int verbose;
+static int verbose = 0;
 
 #define EXIT_OK   0 /* == EXIT_SUCCESS (stdlib.h) man exit(3) */
 #define EXIT_FAIL  1 /* == EXIT_FAILURE (stdlib.h) man exit(3) */
diff --git a/tc_prog/common_kern.h b/tc_prog/common_kern.h
index e62feae..5b9a8c7 100644
--- a/tc_prog/common_kern.h
+++ b/tc_prog/common_kern.h
@@ -90,7 +90,7 @@ unsigned long long load_word(void *skb,
 #define IS_SRC 1
 #define IS_DST 2
 
-static inline void set_ip_tos(struct __sk_buff *skb, unsigned int off, __u8 tos)
+static inline int set_ip_tos(struct __sk_buff *skb, unsigned int off, __u8 tos)
 {
     __u8 old_tos = load_byte(skb, off + IP_TOS_OFF);
     __u8 new_tos;
@@ -103,6 +103,7 @@ static inline void set_ip_tos(struct __sk_buff *skb, unsigned int off, __u8 tos)
         skb, off + IP_CSUM_OFF, htons(old_tos), htons(new_tos), 2);
     bpf_skb_store_bytes(
         skb, off + IP_TOS_OFF, &new_tos, sizeof(new_tos), 0);
+    return TC_ACT_OK;
 }
 
 static inline void set_new_ip(
diff --git a/tc_prog/tc_prog_kern.c b/tc_prog/tc_prog_kern.c
index 12004ed..5aa8573 100644
--- a/tc_prog/tc_prog_kern.c
+++ b/tc_prog/tc_prog_kern.c
@@ -5,49 +5,49 @@
 #define PORT_MAX 65535
 #define ENABLENP
 
-struct bpf_elf_map SEC("maps") ingress_cache = {
-    .type = BPF_MAP_TYPE_LRU_HASH,
-    .size_key = sizeof(__be32),
-    .size_value = sizeof(struct ingressinfo),
-    .pinning    = PIN_GLOBAL_NS,
-    .max_elem = 1024,
-};
+struct {
+    __uint(type, BPF_MAP_TYPE_LRU_HASH);
+    __uint(max_entries, 1024);
+    __type(key, __be32);
+    __type(value, struct ingressinfo);
+    __uint(pinning, LIBBPF_PIN_BY_NAME);
+} ingress_cache SEC(".maps");
 
-struct bpf_elf_map SEC("maps") egressip_cache = {
-    .type = BPF_MAP_TYPE_LRU_HASH,
-    .size_key = sizeof(__be32),
-    .size_value = sizeof(__be32),
-    .pinning    = PIN_GLOBAL_NS,
-    .max_elem = 4096
-};
+struct {
+    __uint(type, BPF_MAP_TYPE_LRU_HASH);
+    __uint(max_entries, 4096);
+    __type(key, __be32);
+    __type(value, __be32);
+    __uint(pinning, LIBBPF_PIN_BY_NAME);
+} egressip_cache SEC(".maps");
 
-struct bpf_elf_map SEC("maps") egress_cache = {
-    .type = BPF_MAP_TYPE_LRU_HASH,
-    .size_key = sizeof(__be32),
-    .size_value = sizeof(struct egressinfo),
-    .pinning    = PIN_GLOBAL_NS,
-    .max_elem = 1024,
-};
+struct {
+    __uint(type, BPF_MAP_TYPE_LRU_HASH);
+    __uint(max_entries, 1024);
+    __type(key, __be32);
+    __type(value, struct egressinfo);
+    __uint(pinning, LIBBPF_PIN_BY_NAME);
+} egress_cache SEC(".maps");
 
-struct bpf_elf_map SEC("maps") policy_cache = {
-    .type = BPF_MAP_TYPE_LRU_HASH,
-    .size_key = sizeof(struct fivetuple),
-    .size_value = sizeof(struct action),
-    .pinning    = PIN_GLOBAL_NS,
-    .max_elem = 4096,
-};
+struct {
+    __uint(type, BPF_MAP_TYPE_LRU_HASH);
+    __uint(max_entries, 4096);
+    __type(key, struct fivetuple);
+    __type(value, struct action);
+    __uint(pinning, LIBBPF_PIN_BY_NAME);
+} policy_cache SEC(".maps");
 
-struct bpf_elf_map SEC("maps") devmap = {
-    .type = BPF_MAP_TYPE_LRU_HASH,
-    .size_key = sizeof(int),
-    .size_value = sizeof(struct devinfo),
-    .pinning    = PIN_GLOBAL_NS,
-    .max_elem = 8,
-};
+struct {
+    __uint(type, BPF_MAP_TYPE_LRU_HASH);
+    __uint(max_entries, 8);
+    __type(key, int);
+    __type(value, struct devinfo);
+    __uint(pinning, LIBBPF_PIN_BY_NAME);
+} devmap SEC(".maps");
 
 SEC("tc_init_e")
 int tc_init_e_func(struct __sk_buff *skb) {
-    int err;
+    // int err;
     void *data = (void *)(long)skb->data;
     void *data_end = (void *)(long)skb->data_end;
     ////////////////// Check if the packet is a VXLAN packet ////////////////////
@@ -95,12 +95,14 @@ int tc_init_e_func(struct __sk_buff *skb) {
     // Make sure there is elem in the map
     struct egressinfo tmpnodeegressinfo_;
     initegressinfo(&tmpnodeegressinfo_, data, skb->ifindex);
-    err = bpf_map_update_elem(&egress_cache, &outer_iph->daddr, &tmpnodeegressinfo_, BPF_NOEXIST);
+    // err = 
+    bpf_map_update_elem(&egress_cache, &outer_iph->daddr, &tmpnodeegressinfo_, BPF_NOEXIST);
     // if(!err) {
         // bpf_printkm("(tc_init_e)INFO: Updated an nodeegressinfo element");
     // }
 
-    err = bpf_map_update_elem(&egressip_cache, &inner_iph->daddr, &outer_iph->daddr, BPF_NOEXIST);
+    // err = 
+    bpf_map_update_elem(&egressip_cache, &inner_iph->daddr, &outer_iph->daddr, BPF_NOEXIST);
     // if(!err) {
         // bpf_printkm("(tc_init_e)INFO: Added an podip element. RemoteIP is %x", inner_iph->daddr);
     // }