-#ifdef PARSE_8021Q
- if (eth->h_proto == BE16(ETH_P_8021Q)) {
- if ((void*)(size_t)ctx->data + sizeof(struct ethhdr_vlan) > data_end)
+#if PARSE_8021Q == PARSE
+ if (likely(eth->h_proto == BE16(ETH_P_8021Q))) {
+ if (unlikely((void*)(size_t)ctx->data + sizeof(struct ethhdr_vlan) > data_end))