Adding Nikhil's fat tree model from the uiuc_tracer branch of the codes-net repo

codes/net/fattree.h

+#ifndef FATTREE_H
+#define FATTREE_H
+
+#include <ross.h>
+
+typedef struct fattree_message fattree_message;
+
+/* this message is used for both dragonfly compute nodes and routers */
+struct fattree_message
+{
+ /* packet ID of the flit  */
+  unsigned long long packet_ID;
+  /* event type of the flit */
+  short  type;
+  /* category: comes from codes */
+  char category[CATEGORY_NAME_MAX];
+  /* final destination LP ID, this comes from codes can be a server or any other LP type*/
+  tw_lpid final_dest_gid;
+  /*sending LP ID from CODES, can be a server or any other LP type */
+  tw_lpid sender_lp;
+ /* destination terminal ID of the message */
+  int dest_num;
+  /* source terminal ID of the fattree */
+  unsigned int src_terminal_id;
+  /* Intermediate LP ID from which this message is coming */
+  unsigned int intm_lp_id;
+  short saved_vc;
+  short saved_off;
+  int last_hop;
+  int intm_id; //to find which port I connect to sender with
+
+  // For buffer message
+  short vc_index;
+  short vc_off;
+
+  /* for reverse computation */   
+  tw_stime saved_available_time;
+  tw_stime saved_credit_time;
+  uint64_t packet_size;
+   
+  /* meta data to aggregate packets into a message at receiver */
+  uint64_t msg_size;
+  uint64_t src_nic;
+  uint64_t uniq_id;
+  uint64_t saved_size;
+
+  int remote_event_size_bytes;
+  int local_event_size_bytes;
+
+};
+
+#endif /* end of include guard: FATTREE_H */
+