perf: 优化session_ctx减少内存占用; 优化global metrics的结构

platform/include/packet_io.h

@@ -12,6 +12,35 @@ extern "C"
  * Packet IO API for gtest
  ******************************************************************************/
 
+struct sids
+{
+    sid_t elems[MR_SID_LIST_MAXLEN];
+    int num;
+};
+
+struct route_ctx
+{
+    char data[64];
+    int len;
+};
+
+struct metadata
+{
+    uint64_t session_id;
+    uint32_t rehash_index;
+
+    char *raw_data; // refer to current packet data
+    int raw_len;
+    uint16_t l7offset;
+
+    int direction; // 1: E2I; 0: I2E
+    int is_ctrl_pkt;
+    int is_decrypted;
+
+    struct sids sids;
+    struct route_ctx route_ctx;
+};
+
 int mbuff_get_metadata(marsio_buff_t *rx_buff, struct metadata *meta);
 int mbuff_set_metadata(marsio_buff_t *tx_buff, struct metadata *meta);
 void vlan_encapsulate(marsio_buff_t *mbuff, int vlan_id, int replace_orig_vlan_header);