perf: 删除无效代码；修改变量命名；减少内存分配

common/include/packet.h

@@ -99,7 +99,9 @@ int packet_get_outermost_two_tuple(const struct packet *handler, struct two_tupl
 const struct layer_record *packet_get_innermost_layer(const struct packet *handler, enum layer_type type);
 const struct layer_record *packet_get_outermost_layer(const struct packet *handler, enum layer_type type);
 
-uint64_t packet_get_hash(const struct packet *handler, enum ldbc_method method, int dir_is_i2e);
+// direction 1: E2I
+// direction 0: I2E
+uint64_t packet_get_hash(const struct packet *handler, enum ldbc_method method, int direction);
 
 #ifdef __cpluscplus
 }