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/*
 * Copyright (C) 2013 University of Chicago.
 * See COPYRIGHT notice in top-level directory.
 *
 */

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// Local router ID: 0 --- total_router-1
// Router LP ID 
// Terminal LP ID

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#include <ross.h>

#include "codes/codes_mapping.h"
#include "codes/codes.h"
#include "codes/model-net.h"
#include "codes/model-net-method.h"
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#include "codes/model-net-lp.h"
#include "codes/net/dragonfly.h"
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#define CREDIT_SIZE 8
#define MEAN_PROCESS 1.0

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/* collective specific parameters */
#define TREE_DEGREE 4
#define LEVEL_DELAY 1000
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#define DRAGONFLY_COLLECTIVE_DEBUG 0
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#define NUM_COLLECTIVES  1
#define COLLECTIVE_COMPUTATION_DELAY 5700
#define DRAGONFLY_FAN_OUT_DELAY 20.0

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// debugging parameters
#define TRACK 235221
#define PRINT_ROUTER_TABLE 1
#define DEBUG 1

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#define LP_CONFIG_NM (model_net_lp_config_names[DRAGONFLY])
#define LP_METHOD_NM (model_net_method_names[DRAGONFLY])

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// arrival rate
static double MEAN_INTERVAL=200.0;
/* radix of a dragonfly router = number of global channels + number of
 * compute node channels + number of local router channels */
static int radix=0;

/* configurable parameters, coming from the codes config file*/
/* number of virtual channels, number of routers comes from the
 * config file, number of compute nodes, global channels and group
 * is calculated from these configurable parameters */
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static int num_vcs, num_routers, num_cn, num_global_channels, num_groups, chunk_size;
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/* adaptive threshold is to bias the adaptive routing */
static int total_routers, adaptive_threshold = 10;

/* minimal and non-minimal packet counts for adaptive routing*/
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int minimal_count=0, nonmin_count=0;
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/* configurable parameters, global channel, local channel and 
 * compute node bandwidth */
static double global_bandwidth, local_bandwidth, cn_bandwidth;

/*configurable parameters, global virtual channel size, local
 * virtual channel size and compute node channel size */
static int global_vc_size, local_vc_size, cn_vc_size;

/* global variables for codes mapping */
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static char lp_group_name[MAX_NAME_LENGTH];
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static int mapping_grp_id, mapping_type_id, mapping_rep_id, mapping_offset;

/* handles terminal and router events like packet generate/send/receive/buffer */
typedef enum event_t event_t;

typedef struct terminal_state terminal_state;
typedef struct router_state router_state;

/* dragonfly compute node data structure */
struct terminal_state
{
   unsigned long long packet_counter;

   // Dragonfly specific parameters
   unsigned int router_id;
   unsigned int terminal_id;

   // Each terminal will have an input and output channel with the router
   int* vc_occupancy; // NUM_VC
   int* output_vc_state;
   tw_stime terminal_available_time;
   tw_stime next_credit_available_time;
// Terminal generate, sends and arrival T_SEND, T_ARRIVAL, T_GENERATE
// Router-Router Intra-group sends and receives RR_LSEND, RR_LARRIVE
// Router-Router Inter-group sends and receives RR_GSEND, RR_GARRIVE
   struct mn_stats dragonfly_stats_array[CATEGORY_MAX];
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  /* collective init time */
  tw_stime collective_init_time;

  /* node ID in the tree */ 
   tw_lpid node_id;

   /* messages sent & received in collectives may get interchanged several times so we have to save the 
     origin server information in the node's state */
   tw_lpid origin_svr; 
  
  /* parent node ID of the current node */
   tw_lpid parent_node_id;
   /* array of children to be allocated in terminal_init*/
   tw_lpid* children;

   /* children of a node can be less than or equal to the tree degree */
   int num_children;

   short is_root;
   short is_leaf;

   /* to maintain a count of child nodes that have fanned in at the parent during the collective
      fan-in phase*/
   int num_fan_nodes;
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};
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/* terminal event type (1-4) */
enum event_t
{
  T_GENERATE=1,
  T_ARRIVE,
  T_SEND,
  T_BUFFER,
  R_SEND,
  R_ARRIVE,
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  R_BUFFER,
  D_COLLECTIVE_INIT,
  D_COLLECTIVE_FAN_IN,
  D_COLLECTIVE_FAN_OUT
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};
/* status of a virtual channel can be idle, active, allocated or wait for credit */
enum vc_status
{
   VC_IDLE,
   VC_ACTIVE,
   VC_ALLOC,
   VC_CREDIT
};

/* whether the last hop of a packet was global, local or a terminal */
enum last_hop
{
   GLOBAL,
   LOCAL,
   TERMINAL
};

/* three forms of routing algorithms available, adaptive routing is not
 * accurate and fully functional in the current version as the formulas
 * for detecting load on global channels are not very accurate */
enum ROUTING_ALGO
{
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    MINIMAL = 0,
    NON_MINIMAL,
    ADAPTIVE
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};

struct router_state
{
   unsigned int router_id;
   unsigned int group_id;
  
   int* global_channel; 
   tw_stime* next_output_available_time;
   tw_stime* next_credit_available_time;
   int* vc_occupancy;
   int* output_vc_state;
};

static short routing = MINIMAL;

static int head_delay;
static uint64_t num_chunks;

static tw_stime         dragonfly_total_time = 0;
static tw_stime         dragonfly_max_latency = 0;
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static tw_stime         max_collective = 0;
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static long long       total_hops = 0;
static long long       N_finished_packets = 0;

/* returns the dragonfly router lp type for lp registration */
static const tw_lptype* dragonfly_get_router_lp_type(void);

/* returns the dragonfly message size */
static int dragonfly_get_msg_sz(void)
{
	   return sizeof(terminal_message);
}


/* setup the dragonfly model, initialize global parameters */
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static void dragonfly_setup(const void* net_params)
{
   dragonfly_param* d_param = (dragonfly_param*)net_params;

   num_vcs = d_param->num_vcs;
   num_routers = d_param->num_routers;
   num_cn = num_routers/2;
   num_global_channels = num_routers/2;
   num_groups = num_routers * num_cn + 1; 

   global_bandwidth = d_param->global_bandwidth;
   local_bandwidth = d_param->local_bandwidth;
   cn_bandwidth = d_param->cn_bandwidth;

   global_vc_size = d_param->global_vc_size;
   local_vc_size = d_param->local_vc_size;
   cn_vc_size = d_param->cn_vc_size;
   routing = d_param->routing;
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   chunk_size = d_param->chunk_size;
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   radix = num_vcs * (num_cn + num_global_channels + num_routers);
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   total_routers = num_groups * num_routers;
   lp_type_register("dragonfly_router", dragonfly_get_router_lp_type());
   return;
}

/* report dragonfly statistics like average and maximum packet latency, average number of hops traversed */
static void dragonfly_report_stats()
{
/* TODO: Add dragonfly packet average, maximum latency and average number of hops traversed */
   long long avg_hops, total_finished_packets;
   tw_stime avg_time, max_time;
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   int total_minimal_packets, total_nonmin_packets;
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   MPI_Reduce( &total_hops, &avg_hops, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
   MPI_Reduce( &N_finished_packets, &total_finished_packets, 1, MPI_LONG_LONG, MPI_SUM, 0, MPI_COMM_WORLD);
   MPI_Reduce( &dragonfly_total_time, &avg_time, 1,MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
   MPI_Reduce( &dragonfly_max_latency, &max_time, 1, MPI_DOUBLE, MPI_MAX, 0, MPI_COMM_WORLD);
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   if(routing == ADAPTIVE)
    {
	MPI_Reduce(&minimal_count, &total_minimal_packets, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
 	MPI_Reduce(&nonmin_count, &total_nonmin_packets, 1, MPI_INT, MPI_SUM, 0, MPI_COMM_WORLD);
    }
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   /* print statistics */
   if(!g_tw_mynode)
   {
      printf(" Average number of hops traversed %f average message latency %lf us maximum message latency %lf us \n", (float)avg_hops/total_finished_packets, avg_time/(total_finished_packets*1000), max_time/1000);
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     if(routing == ADAPTIVE)
              printf("\n ADAPTIVE ROUTING STATS: %d packets routed minimally %d packets routed non-minimally ", total_minimal_packets, total_nonmin_packets);
 
  }
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   return;
}
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void dragonfly_collective_init(terminal_state * s,
           		   tw_lp * lp)
{
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    // TODO: be annotation-aware
    codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, NULL,
            &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
    int num_lps = codes_mapping_get_lp_count(lp_group_name, 1, LP_CONFIG_NM,
            NULL, 1);
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    int num_reps = codes_mapping_get_group_reps(lp_group_name);
    s->node_id = (mapping_rep_id * num_lps) + mapping_offset;

    int i;
   /* handle collective operations by forming a tree of all the LPs */
   /* special condition for root of the tree */
   if( s->node_id == 0)
    {
        s->parent_node_id = -1;
        s->is_root = 1;
   }
   else
   {
       s->parent_node_id = (s->node_id - ((s->node_id - 1) % TREE_DEGREE)) / TREE_DEGREE;
       s->is_root = 0;
   }
   s->children = (tw_lpid*)malloc(TREE_DEGREE * sizeof(tw_lpid));

   /* set the isleaf to zero by default */
   s->is_leaf = 1;
   s->num_children = 0;

   /* calculate the children of the current node. If its a leaf, no need to set children,
      only set isleaf and break the loop*/

   for( i = 0; i < TREE_DEGREE; i++ )
    {
        tw_lpid next_child = (TREE_DEGREE * s->node_id) + i + 1;
        if(next_child < (num_lps * num_reps))
        {
            s->num_children++;
            s->is_leaf = 0;
            s->children[i] = next_child;
        }
        else
           s->children[i] = -1;
    }

#if DRAGONFLY_COLLECTIVE_DEBUG == 1
   printf("\n LP %ld parent node id ", s->node_id);

   for( i = 0; i < TREE_DEGREE; i++ )
        printf(" child node ID %ld ", s->children[i]);
   printf("\n");

   if(s->is_leaf)
        printf("\n LP %ld is leaf ", s->node_id);
#endif
}

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/* dragonfly packet event , generates a dragonfly packet on the compute node */
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static tw_stime dragonfly_packet_event(char* category, tw_lpid final_dest_lp, uint64_t packet_size, int is_pull, uint64_t pull_size, tw_stime offset, int remote_event_size, const void* remote_event, int self_event_size, const void* self_event, tw_lpid src_lp, tw_lp *sender, int is_last_pckt)
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{
    tw_event * e_new;
    tw_stime xfer_to_nic_time;
    terminal_message * msg;
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    tw_lpid dest_nic_id;
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    char* tmp_ptr;

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    //TODO: be annotation-aware
    codes_mapping_get_lp_info(final_dest_lp, lp_group_name, &mapping_grp_id,
            NULL, &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
    codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, NULL, 1,
            mapping_rep_id, mapping_offset, &dest_nic_id);
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    xfer_to_nic_time = codes_local_latency(sender); /* Throws an error of found last KP time > current event time otherwise when LPs of one type are placed together*/
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    //printf("\n transfer in time %f %f ", xfer_to_nic_time+offset, tw_now(sender));
    //e_new = tw_event_new(sender->gid, xfer_to_nic_time+offset, sender);
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    //msg = tw_event_data(e_new);
    e_new = model_net_method_event_new(sender->gid, xfer_to_nic_time+offset,
            sender, DRAGONFLY, (void**)&msg, (void**)&tmp_ptr);
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    strcpy(msg->category, category);
    msg->final_dest_gid = final_dest_lp;
    msg->dest_terminal_id = dest_nic_id;
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    msg->sender_lp=src_lp;
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    msg->packet_size = packet_size;
    msg->remote_event_size_bytes = 0;
    msg->local_event_size_bytes = 0;
    msg->type = T_GENERATE;
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    msg->is_pull = is_pull;
    msg->pull_size = pull_size;
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    if(is_last_pckt) /* Its the last packet so pass in remote and local event information*/
      {
	if(remote_event_size > 0)
	 {
		msg->remote_event_size_bytes = remote_event_size;
		memcpy(tmp_ptr, remote_event, remote_event_size);
		tmp_ptr += remote_event_size;
	}
	if(self_event_size > 0)
	{
		msg->local_event_size_bytes = self_event_size;
		memcpy(tmp_ptr, self_event, self_event_size);
		tmp_ptr += self_event_size;
	}
     }
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	   //printf("\n dragonfly remote event %d local event %d last packet %d %lf ", msg->remote_event_size_bytes, msg->local_event_size_bytes, is_last_pckt, xfer_to_nic_time);
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    tw_event_send(e_new);
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    return xfer_to_nic_time;
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}

/* dragonfly packet event reverse handler */
static void dragonfly_packet_event_rc(tw_lp *sender)
{
	  codes_local_latency_reverse(sender);
	    return;
}

/* given a group ID gid, find the router in the current group that is attached
 * to a router in the group gid */
tw_lpid getRouterFromGroupID(int gid, 
		    router_state * r)
{
  int group_begin = r->group_id * num_routers;
  int group_end = (r->group_id * num_routers) + num_routers-1;
  int offset = (gid * num_routers - group_begin) / num_routers;
  
  if((gid * num_routers) < group_begin)
    offset = (group_begin - gid * num_routers) / num_routers; // take absolute value
  
  int half_channel = num_global_channels / 2;
  int index = (offset - 1)/(half_channel * num_routers);
  
  offset=(offset - 1) % (half_channel * num_routers);

  // If the destination router is in the same group
  tw_lpid router_id;

  if(index % 2 != 0)
    router_id = group_end - (offset / half_channel); // start from the end
  else
    router_id = group_begin + (offset / half_channel);

  return router_id;
}	

/*When a packet is sent from the current router and a buffer slot becomes available, a credit is sent back to schedule another packet event*/
void router_credit_send(router_state * s, tw_bf * bf, terminal_message * msg, tw_lp * lp)
{
  tw_event * buf_e;
  tw_stime ts;
  terminal_message * buf_msg;

  int dest=0, credit_delay=0, type = R_BUFFER;
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  int is_terminal = 0;
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 // Notify sender terminal about available buffer space
  if(msg->last_hop == TERMINAL)
  {
   dest = msg->src_terminal_id;
   //determine the time in ns to transfer the credit
   credit_delay = (1 / cn_bandwidth) * CREDIT_SIZE;
   type = T_BUFFER;
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   is_terminal = 1;
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  }
   else if(msg->last_hop == GLOBAL)
   {
     dest = msg->intm_lp_id;
     credit_delay = (1 / global_bandwidth) * CREDIT_SIZE;
   }
    else if(msg->last_hop == LOCAL)
     {
        dest = msg->intm_lp_id;
     	credit_delay = (1/local_bandwidth) * CREDIT_SIZE;
     }
    else
      printf("\n Invalid message type");

   // Assume it takes 0.1 ns of serialization latency for processing the credits in the queue
    int output_port = msg->saved_vc / num_vcs;
    msg->saved_available_time = s->next_credit_available_time[output_port];
    s->next_credit_available_time[output_port] = max(tw_now(lp), s->next_credit_available_time[output_port]);
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    ts = credit_delay + 0.1 + tw_rand_exponential(lp->rng, (double)credit_delay/1000);
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    s->next_credit_available_time[output_port]+=ts;
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    if (is_terminal){
        buf_e = model_net_method_event_new(dest, 
                s->next_credit_available_time[output_port] - tw_now(lp), lp,
                DRAGONFLY, (void**)&buf_msg, NULL);
    }
    else{
        buf_e = tw_event_new(dest, s->next_credit_available_time[output_port] - tw_now(lp) , lp);
        buf_msg = tw_event_data(buf_e);
    }
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    buf_msg->vc_index = msg->saved_vc;
    buf_msg->type=type;
    buf_msg->last_hop = msg->last_hop;
    buf_msg->packet_ID=msg->packet_ID;

    tw_event_send(buf_e);

    return;
}

/* generates packet at the current dragonfly compute node */
void packet_generate(terminal_state * s, tw_bf * bf, terminal_message * msg, tw_lp * lp)
{
  tw_stime ts;
  tw_event *e;
  terminal_message *m;
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  int i, total_event_size;
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  num_chunks = msg->packet_size / chunk_size;
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  msg->packet_ID = lp->gid + g_tw_nlp * s->packet_counter + tw_rand_integer(lp->rng, 0, lp->gid + g_tw_nlp * s->packet_counter);
  msg->travel_start_time = tw_now(lp);
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  msg->my_N_hop = 0;
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  for(i = 0; i < num_chunks; i++)
  {
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	  // Before
	  // msg->my_N_hop = 0; generating a packet, check if the input queue is available
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        ts = g_tw_lookahead + 0.1 + tw_rand_exponential(lp->rng, MEAN_INTERVAL/200);
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	int chan = -1, j;
	for(j = 0; j < num_vcs; j++)
	 {
	     if(s->vc_occupancy[j] < cn_vc_size * num_chunks)
	      {
	       chan=j;
	       break;
	      }
         }

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        // this is a terminal event, so use the method-event version
       //e = tw_event_new(lp->gid, i + ts, lp);
       //m = tw_event_data(e);
       //memcpy(m, msg, sizeof(terminal_message) + msg->remote_event_size_bytes + msg->local_event_size_bytes);
       void * m_data;
       e = model_net_method_event_new(lp->gid, i+ts, lp, DRAGONFLY,
               (void**)&m, &m_data);
       memcpy(m, msg, sizeof(terminal_message));
       void * m_data_src = model_net_method_get_edata(DRAGONFLY, msg);
       if (msg->remote_event_size_bytes){
            memcpy(m_data, m_data_src, msg->remote_event_size_bytes);
       }
       if (msg->local_event_size_bytes){ 
            memcpy((char*)m_data + msg->remote_event_size_bytes,
                    (char*)m_data_src + msg->remote_event_size_bytes,
                    msg->local_event_size_bytes);
       }
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       m->intm_group_id = -1;
       m->saved_vc=0;
       m->chunk_id = i;
       
       if(msg->packet_ID == TRACK && msg->chunk_id == num_chunks-1)
         printf("\n packet generated %lld at terminal %d chunk id %d ", msg->packet_ID, (int)lp->gid, i);
       
       m->output_chan = -1;
       if(chan != -1) // If the input queue is available
   	{
	    // Send the packet out
	     m->type = T_SEND;
 	     tw_event_send(e);
        }
      else
         {
	  printf("\n Exceeded queue size, exitting %d", s->vc_occupancy[0]);
	  MPI_Finalize();
	  exit(-1);
        } //else
  } // for
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  total_event_size = model_net_get_msg_sz(DRAGONFLY) + 
      msg->remote_event_size_bytes + msg->local_event_size_bytes;
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  mn_stats* stat;
  stat = model_net_find_stats(msg->category, s->dragonfly_stats_array);
  stat->send_count++;
  stat->send_bytes += msg->packet_size;
  stat->send_time += (1/cn_bandwidth) * msg->packet_size;
  if(stat->max_event_size < total_event_size)
	  stat->max_event_size = total_event_size;
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  return;
}

/* sends the packet from the current dragonfly compute node to the attached router */
void packet_send(terminal_state * s, tw_bf * bf, terminal_message * msg, tw_lp * lp)
{
  tw_stime ts;
  tw_event *e;
  terminal_message *m;
  tw_lpid router_id;
  /* Route the packet to its source router */ 
   int vc=msg->saved_vc;

   //  Each packet is broken into chunks and then sent over the channel
   msg->saved_available_time = s->terminal_available_time;
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   head_delay = (1/cn_bandwidth) * chunk_size;
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   ts = head_delay + tw_rand_exponential(lp->rng, (double)head_delay/200);
   s->terminal_available_time = max(s->terminal_available_time, tw_now(lp));
   s->terminal_available_time += ts;

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   //TODO: be annotation-aware
   codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, NULL,
           &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
   codes_mapping_get_lp_id(lp_group_name, "dragonfly_router", NULL, 1,
           s->router_id, 0, &router_id);
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   // we are sending an event to the router, so no method_event here
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   e = tw_event_new(router_id, s->terminal_available_time - tw_now(lp), lp);

   if(msg->packet_ID == TRACK && msg->chunk_id == num_chunks-1)
     printf("\n terminal %d packet %lld chunk %d being sent to router %d router id %d ", (int)lp->gid, (long long)msg->packet_ID, msg->chunk_id, (int)router_id, s->router_id);
   m = tw_event_data(e);
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   memcpy(m, msg, sizeof(terminal_message));
   if (msg->remote_event_size_bytes){
        memcpy(m+1, model_net_method_get_edata(DRAGONFLY, msg),
                msg->remote_event_size_bytes);
   }
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   m->type = R_ARRIVE;
   m->src_terminal_id = lp->gid;
   m->saved_vc = vc;
   m->last_hop = TERMINAL;
   m->intm_group_id = -1;
   m->local_event_size_bytes = 0;
   tw_event_send(e);
//  Each chunk is 32B and the VC occupancy is in chunks to enable efficient flow control

   if(msg->chunk_id == num_chunks - 1) 
    {
      /* local completion message */
      if(msg->local_event_size_bytes > 0)
	 {
           tw_event* e_new;
	   terminal_message* m_new;
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	   void* local_event = 
               (char*)model_net_method_get_edata(DRAGONFLY, msg) + 
               msg->remote_event_size_bytes;
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	   ts = g_tw_lookahead + (1/cn_bandwidth) * msg->local_event_size_bytes;
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	   e_new = tw_event_new(msg->sender_lp, ts, lp);
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	   m_new = tw_event_data(e_new);
	   memcpy(m_new, local_event, msg->local_event_size_bytes);
	   tw_event_send(e_new);
	}
    }
   
   s->packet_counter++;
   s->vc_occupancy[vc]++;

   if(s->vc_occupancy[vc] >= (cn_vc_size * num_chunks))
      s->output_vc_state[vc] = VC_CREDIT;
   return;
}

/* packet arrives at the destination terminal */
void packet_arrive(terminal_state * s, tw_bf * bf, terminal_message * msg, tw_lp * lp)
{
#if DEBUG
if( msg->packet_ID == TRACK && msg->chunk_id == num_chunks-1)
    {
	printf( "(%lf) [Terminal %d] packet %lld has arrived  \n",
              tw_now(lp), (int)lp->gid, msg->packet_ID);

	printf("travel start time is %f\n",
                msg->travel_start_time);

	printf("My hop now is %d\n",msg->my_N_hop);
    }
#endif

  // Packet arrives and accumulate # queued
  // Find a queue with an empty buffer slot
   tw_event * e, * buf_e;
   terminal_message * m, * buf_msg;
   tw_stime ts;
   bf->c3 = 0;
   bf->c2 = 0;

   msg->my_N_hop++;
  if(msg->chunk_id == num_chunks-1)
  {
	 bf->c2 = 1;
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	 mn_stats* stat = model_net_find_stats(msg->category, s->dragonfly_stats_array);
	 stat->recv_count++;
	 stat->recv_bytes += msg->packet_size;
	 stat->recv_time += tw_now(lp) - msg->travel_start_time;

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	 N_finished_packets++;
	 dragonfly_total_time += tw_now( lp ) - msg->travel_start_time;
	 total_hops += msg->my_N_hop;

	 if (dragonfly_max_latency < tw_now( lp ) - msg->travel_start_time) 
	 {
		bf->c3 = 1;
		msg->saved_available_time = dragonfly_max_latency;
		dragonfly_max_latency=tw_now( lp ) - msg->travel_start_time;
	 }
	// Trigger an event on receiving server
	if(msg->remote_event_size_bytes)
	{
644
            void * tmp_ptr = model_net_method_get_edata(DRAGONFLY, msg);
645
            ts = g_tw_lookahead + 0.1 + (1/cn_bandwidth) * msg->remote_event_size_bytes;
646
            if (msg->is_pull){
647
                int net_id = model_net_get_id(LP_METHOD_NM);
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                model_net_event(net_id, msg->category, msg->sender_lp,
                        msg->pull_size, ts, msg->remote_event_size_bytes,
                        tmp_ptr, 0, NULL, lp);
            }
            else{
                e = tw_event_new(msg->final_dest_gid, ts, lp);
                m = tw_event_data(e);
                memcpy(m, tmp_ptr, msg->remote_event_size_bytes);
                tw_event_send(e); 
            }
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	}
  }

  int credit_delay = (1 / cn_bandwidth) * CREDIT_SIZE;
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  ts = credit_delay + 0.1 + tw_rand_exponential(lp->rng, credit_delay/1000);
663
  
664
  msg->saved_credit_time = s->next_credit_available_time;
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  s->next_credit_available_time = max(s->next_credit_available_time, tw_now(lp));
  s->next_credit_available_time += ts;

  tw_lpid router_dest_id;
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  //TODO: be annotation-aware
  codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, NULL,
          &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
  codes_mapping_get_lp_id(lp_group_name, "dragonfly_router", NULL, 1,
          s->router_id, 0, &router_dest_id);
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  // no method_event here - message going to router
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  buf_e = tw_event_new(router_dest_id, s->next_credit_available_time - tw_now(lp), lp);
  buf_msg = tw_event_data(buf_e);
  buf_msg->vc_index = msg->saved_vc;
  buf_msg->type=R_BUFFER;
  buf_msg->packet_ID=msg->packet_ID;
  buf_msg->last_hop = TERMINAL;
  tw_event_send(buf_e);

  return;
}

/* initialize a dragonfly compute node terminal */
void 
terminal_init( terminal_state * s, 
	       tw_lp * lp )
{
    int i;
    // Assign the global router ID
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    // TODO: be annotation-aware
   codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, NULL, &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
   int num_lps = codes_mapping_get_lp_count(lp_group_name, 1, LP_CONFIG_NM,
           NULL, 1);
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   s->terminal_id = (mapping_rep_id * num_lps) + mapping_offset;  
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   s->router_id=(int)s->terminal_id / num_routers;
   s->terminal_available_time = 0.0;
   s->packet_counter = 0;

   s->vc_occupancy = (int*)malloc(num_vcs * sizeof(int));
   s->output_vc_state = (int*)malloc(num_vcs * sizeof(int));

   for( i = 0; i < num_vcs; i++ )
    {
      s->vc_occupancy[i]=0;
      s->output_vc_state[i]=VC_IDLE;
    }
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   dragonfly_collective_init(s, lp);
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   return;
}

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/* collective operation for the torus network */
void dragonfly_collective(char* category, int message_size, int remote_event_size, const void* remote_event, tw_lp* sender)
{
    tw_event * e_new;
    tw_stime xfer_to_nic_time;
    terminal_message * msg;
    tw_lpid local_nic_id;
    char* tmp_ptr;

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    codes_mapping_get_lp_info(sender->gid, lp_group_name, &mapping_grp_id,
            NULL, &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
    codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, NULL, 1,
            mapping_rep_id, mapping_offset, &local_nic_id);
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729
    xfer_to_nic_time = codes_local_latency(sender);
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    e_new = model_net_method_event_new(local_nic_id, xfer_to_nic_time,
            sender, DRAGONFLY, (void**)&msg, (void**)&tmp_ptr);

    msg->remote_event_size_bytes = message_size;
    strcpy(msg->category, category);
    msg->sender_svr=sender->gid;
    msg->type = D_COLLECTIVE_INIT;

    tmp_ptr = (char*)msg;
    tmp_ptr += dragonfly_get_msg_sz();
    if(remote_event_size > 0)
     {
            msg->remote_event_size_bytes = remote_event_size;
            memcpy(tmp_ptr, remote_event, remote_event_size);
            tmp_ptr += remote_event_size;
     }

    tw_event_send(e_new);
    return;
}

/* reverse for collective operation of the dragonfly network */
void dragonfly_collective_rc(int message_size, tw_lp* sender)
{
     codes_local_latency_reverse(sender);
     return;
}

static void send_remote_event(terminal_state * s,
                        tw_bf * bf,
                        terminal_message * msg,
                        tw_lp * lp)
{
    // Trigger an event on receiving server
    if(msg->remote_event_size_bytes)
     {
            tw_event* e;
            tw_stime ts;
            terminal_message * m;
            ts = (1/cn_bandwidth) * msg->remote_event_size_bytes;
            e = codes_event_new(s->origin_svr, ts, lp);
            m = tw_event_data(e);
            char* tmp_ptr = (char*)msg;
            tmp_ptr += dragonfly_get_msg_sz();
            memcpy(m, tmp_ptr, msg->remote_event_size_bytes);
            tw_event_send(e);
     }
}

static void node_collective_init(terminal_state * s,
                        tw_bf * bf,
                        terminal_message * msg,
                        tw_lp * lp)
{
        tw_event * e_new;
        tw_lpid parent_nic_id;
        tw_stime xfer_to_nic_time;
        terminal_message * msg_new;
        int num_lps;

        msg->saved_collective_init_time = s->collective_init_time;
        s->collective_init_time = tw_now(lp);
	s->origin_svr = msg->sender_svr;
	
        if(s->is_leaf)
        {
            //printf("\n LP %ld sending message to parent %ld ", s->node_id, s->parent_node_id);
            /* get the global LP ID of the parent node */
798 799 800 801 802 803 804 805 806
            // TODO: be annotation-aware
            codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id,
                    NULL, &mapping_type_id, NULL, &mapping_rep_id,
                    &mapping_offset);
            num_lps = codes_mapping_get_lp_count(lp_group_name, 1, LP_CONFIG_NM,
                    NULL, 1);
            codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, NULL, 1,
                    s->parent_node_id/num_lps, (s->parent_node_id % num_lps),
                    &parent_nic_id);
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           /* send a message to the parent that the LP has entered the collective operation */
            xfer_to_nic_time = g_tw_lookahead + LEVEL_DELAY;
            //e_new = codes_event_new(parent_nic_id, xfer_to_nic_time, lp);
	    void* m_data;
	    e_new = model_net_method_event_new(parent_nic_id, xfer_to_nic_time,
            	lp, DRAGONFLY, (void**)&msg_new, (void**)&m_data);
	    	
            memcpy(msg_new, msg, sizeof(terminal_message));
	    if (msg->remote_event_size_bytes){
        	memcpy(m_data, model_net_method_get_edata(DRAGONFLY, msg),
                	msg->remote_event_size_bytes);
      	    }
	    
            msg_new->type = D_COLLECTIVE_FAN_IN;
            msg_new->sender_node = s->node_id;

            tw_event_send(e_new);
        }
        return;
}

static void node_collective_fan_in(terminal_state * s,
                        tw_bf * bf,
                        terminal_message * msg,
                        tw_lp * lp)
{
        int i;
        s->num_fan_nodes++;

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        codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id,
                NULL, &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
        int num_lps = codes_mapping_get_lp_count(lp_group_name, 1, LP_CONFIG_NM,
                NULL, 1);
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        tw_event* e_new;
        terminal_message * msg_new;
        tw_stime xfer_to_nic_time;

        bf->c1 = 0;
        bf->c2 = 0;

        /* if the number of fanned in nodes have completed at the current node then signal the parent */
        if((s->num_fan_nodes == s->num_children) && !s->is_root)
        {
            bf->c1 = 1;
            msg->saved_fan_nodes = s->num_fan_nodes-1;
            s->num_fan_nodes = 0;
            tw_lpid parent_nic_id;
            xfer_to_nic_time = g_tw_lookahead + LEVEL_DELAY;

            /* get the global LP ID of the parent node */
859 860 861
            codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, NULL, 1,
                    s->parent_node_id/num_lps, (s->parent_node_id % num_lps),
                    &parent_nic_id);
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           /* send a message to the parent that the LP has entered the collective operation */
            //e_new = codes_event_new(parent_nic_id, xfer_to_nic_time, lp);
            //msg_new = tw_event_data(e_new);
	    void * m_data;
      	    e_new = model_net_method_event_new(parent_nic_id,
              xfer_to_nic_time,
              lp, DRAGONFLY, (void**)&msg_new, &m_data);
	    
            memcpy(msg_new, msg, sizeof(terminal_message));
            msg_new->type = D_COLLECTIVE_FAN_IN;
            msg_new->sender_node = s->node_id;

            if (msg->remote_event_size_bytes){
	        memcpy(m_data, model_net_method_get_edata(DRAGONFLY, msg),
        	        msg->remote_event_size_bytes);
      	   }
	    
            tw_event_send(e_new);
      }

      /* root node starts off with the fan-out phase */
      if(s->is_root && (s->num_fan_nodes == s->num_children))
      {
           bf->c2 = 1;
           msg->saved_fan_nodes = s->num_fan_nodes-1;
           s->num_fan_nodes = 0;
           send_remote_event(s, bf, msg, lp);

           for( i = 0; i < s->num_children; i++ )
           {
                tw_lpid child_nic_id;
                /* Do some computation and fan out immediate child nodes from the collective */
                xfer_to_nic_time = g_tw_lookahead + COLLECTIVE_COMPUTATION_DELAY + LEVEL_DELAY + tw_rand_exponential(lp->rng, (double)LEVEL_DELAY/50);

                /* get global LP ID of the child node */
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                codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, NULL, 1,
                        s->children[i]/num_lps, (s->children[i] % num_lps),
                        &child_nic_id);
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                //e_new = codes_event_new(child_nic_id, xfer_to_nic_time, lp);

                //msg_new = tw_event_data(e_new);
                void * m_data;
	        e_new = model_net_method_event_new(child_nic_id,
                xfer_to_nic_time,
		lp, DRAGONFLY, (void**)&msg_new, &m_data);

		memcpy(msg_new, msg, sizeof(terminal_message));
	        if (msg->remote_event_size_bytes){
911
	                memcpy(m_data, model_net_method_get_edata(DRAGONFLY, msg),
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        	               msg->remote_event_size_bytes);
      		}
		
                msg_new->type = D_COLLECTIVE_FAN_OUT;
                msg_new->sender_node = s->node_id;

                tw_event_send(e_new);
           }
      }
}

static void node_collective_fan_out(terminal_state * s,
                        tw_bf * bf,
                        terminal_message * msg,
                        tw_lp * lp)
{
        int i;
929 930
        int num_lps = codes_mapping_get_lp_count(lp_group_name, 1, LP_CONFIG_NM,
                NULL, 1);
931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951
        bf->c1 = 0;
        bf->c2 = 0;

        send_remote_event(s, bf, msg, lp);

        if(!s->is_leaf)
        {
            bf->c1 = 1;
            tw_event* e_new;
            nodes_message * msg_new;
            tw_stime xfer_to_nic_time;

           for( i = 0; i < s->num_children; i++ )
           {
                xfer_to_nic_time = g_tw_lookahead + DRAGONFLY_FAN_OUT_DELAY + tw_rand_exponential(lp->rng, (double)DRAGONFLY_FAN_OUT_DELAY/10);

                if(s->children[i] > 0)
                {
                        tw_lpid child_nic_id;

                        /* get global LP ID of the child node */
952 953 954
                        codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM,
                                NULL, 1, s->children[i]/num_lps,
                                (s->children[i] % num_lps), &child_nic_id);
955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981
                        //e_new = codes_event_new(child_nic_id, xfer_to_nic_time, lp);
                        //msg_new = tw_event_data(e_new);
                        //memcpy(msg_new, msg, sizeof(nodes_message) + msg->remote_event_size_bytes);
			void* m_data;
			e_new = model_net_method_event_new(child_nic_id,
							xfer_to_nic_time,
					                lp, DRAGONFLY, (void**)&msg_new, &m_data);
		        memcpy(msg_new, msg, sizeof(nodes_message));
		        if (msg->remote_event_size_bytes){
			        memcpy(m_data, model_net_method_get_edata(DRAGONFLY, msg),
			                msg->remote_event_size_bytes);
      			}


                        msg_new->type = D_COLLECTIVE_FAN_OUT;
                        msg_new->sender_node = s->node_id;
                        tw_event_send(e_new);
                }
           }
         }
	//printf("\n Fan out phase completed %ld ", lp->gid);
        if(max_collective < tw_now(lp) - s->collective_init_time )
          {
              bf->c2 = 1;
              max_collective = tw_now(lp) - s->collective_init_time;
          }
}
982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021
/* update the compute node-router channel buffer */
void 
terminal_buf_update(terminal_state * s, 
		    tw_bf * bf, 
		    terminal_message * msg, 
		    tw_lp * lp)
{
  // Update the buffer space associated with this router LP 
    int msg_indx = msg->vc_index;
    
    s->vc_occupancy[msg_indx]--;
    s->output_vc_state[msg_indx] = VC_IDLE;

    return;
}

void 
terminal_event( terminal_state * s, 
		tw_bf * bf, 
		terminal_message * msg, 
		tw_lp * lp )
{
  *(int *)bf = (int)0;
  switch(msg->type)
    {
    case T_GENERATE:
       packet_generate(s,bf,msg,lp);
    break;
    
    case T_ARRIVE:
        packet_arrive(s,bf,msg,lp);
    break;
    
    case T_SEND:
      packet_send(s,bf,msg,lp);
    break;
    
    case T_BUFFER:
       terminal_buf_update(s, bf, msg, lp);
     break;
1022 1023 1024 1025
    
    case D_COLLECTIVE_INIT:
      node_collective_init(s, bf, msg, lp);
    break;
1026

1027 1028 1029 1030 1031 1032 1033 1034
    case D_COLLECTIVE_FAN_IN:
      node_collective_fan_in(s, bf, msg, lp);
    break;

    case D_COLLECTIVE_FAN_OUT:
      node_collective_fan_out(s, bf, msg, lp);
    break;
    
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    default:
       printf("\n LP %d Terminal message type not supported %d ", (int)lp->gid, msg->type);
    }
}

void 
1041
dragonfly_terminal_final( terminal_state * s, 
1042 1043
      tw_lp * lp )
{
1044
	model_net_print_stats(lp->gid, s->dragonfly_stats_array);
1045 1046
}

1047 1048 1049 1050 1051
void dragonfly_router_final(router_state * s,
		tw_lp * lp)
{
   free(s->global_channel);
}
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/* get the next stop for the current packet
 * determines if it is a router within a group, a router in another group
 * or the destination terminal */
tw_lpid 
get_next_stop(router_state * s, 
		      tw_bf * bf, 
		      terminal_message * msg, 
		      tw_lp * lp, 
		      int path)
{
   int dest_lp;
1063
   tw_lpid router_dest_id = -1;
1064 1065 1066
   int i;
   int dest_group_id;

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   //TODO: be annotation-aware
   codes_mapping_get_lp_info(msg->dest_terminal_id, lp_group_name,
           &mapping_grp_id, NULL, &mapping_type_id, NULL, &mapping_rep_id,
           &mapping_offset); 
   int num_lps = codes_mapping_get_lp_count(lp_group_name, 1, LP_CONFIG_NM,
           NULL, 1);
1073
   int dest_router_id = (mapping_offset + (mapping_rep_id * num_lps)) / num_routers;
1074
   
1075 1076
   codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, NULL,
           &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
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   int local_router_id = (mapping_offset + mapping_rep_id);

   bf->c2 = 0;

1081
  /* If the packet has arrived at the destination router */
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   if(dest_router_id == local_router_id)
    {
        dest_lp = msg->dest_terminal_id;

        return dest_lp;
    }
1088
   /* Generate inter-mediate destination for non-minimal routing (selecting a random group) */
1089
   if(msg->last_hop == TERMINAL && msg->path_type == NON_MINIMAL)
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    {
      if(dest_router_id / num_routers != s->group_id)
         {
            bf->c2 = 1;
            int intm_grp_id = tw_rand_integer(lp->rng, 0, num_groups-1);
1095 1096
            //int intm_grp_id = (s->group_id + s->group_id/2) % num_groups;
	    msg->intm_group_id = intm_grp_id;
1097 1098
          }    
    }
1099
  /* It means that the packet has arrived at the inter-mediate group for non-minimal routing. Reset the group now. */
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   if(msg->intm_group_id == s->group_id)
   {  
           msg->intm_group_id = -1;//no inter-mediate group
   } 
1104
  /* Intermediate group ID is set. Divert the packet to an intermediate group. */
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  if(msg->intm_group_id >= 0)
   {
      dest_group_id = msg->intm_group_id;
   }
1109
  else /* direct the packet to the destination group */
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   {
     dest_group_id = dest_router_id / num_routers;
   }
  
1114
  /* It means the packet has arrived at the destination group. Now divert it to the destination router. */
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  if(s->group_id == dest_group_id)
   {
     dest_lp = dest_router_id;
   }
   else
   {
1121
      /* Packet is at the source or intermediate group. Find a router that has a path to the destination group. */
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      dest_lp=getRouterFromGroupID(dest_group_id,s);
  
      if(dest_lp == local_router_id)
      {
        for(i=0; i < num_global_channels; i++)
           {
            if(s->global_channel[i] / num_routers == dest_group_id)
                dest_lp=s->global_channel[i];
          }
      }
   }
1133 1134
  codes_mapping_get_lp_id(lp_group_name, "dragonfly_router", NULL, 1, dest_lp,
          0, &router_dest_id);
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  return router_dest_id;
}

/* gets the output port corresponding to the next stop of the message */
int 
get_output_port( router_state * s, 
		tw_bf * bf, 
		terminal_message * msg, 
		tw_lp * lp, 
		int next_stop )
{
  int output_port = -1, i, terminal_id;
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  codes_mapping_get_lp_info(msg->dest_terminal_id, lp_group_name,
          &mapping_grp_id, NULL, &mapping_type_id, NULL, &mapping_rep_id,
          &mapping_offset);
  int num_lps = codes_mapping_get_lp_count(lp_group_name,1,LP_CONFIG_NM,NULL,1);
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  terminal_id = (mapping_rep_id * num_lps) + mapping_offset;
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  if(next_stop == msg->dest_terminal_id)
   {
      output_port = num_routers + num_global_channels + ( terminal_id % num_cn);
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      //if(output_port > 6)
	//      printf("\n incorrect output port %d terminal id %d ", output_port, terminal_id);
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    }
    else
    {
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     codes_mapping_get_lp_info(next_stop, lp_group_name, &mapping_grp_id,
             NULL, &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
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     int local_router_id = mapping_rep_id + mapping_offset;
     int intm_grp_id = local_router_id / num_routers;

     if(intm_grp_id != s->group_id)
      {
        for(i=0; i < num_global_channels; i++)
         {
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           if(s->global_channel[i] == local_router_id)
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             output_port = num_routers + i;
          }
      }
      else
       {
        output_port = local_router_id % num_routers;
       }
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//	      printf("\n output port not found %d next stop %d local router id %d group id %d intm grp id %d %d", output_port, next_stop, local_router_id, s->group_id, intm_grp_id, local_router_id%num_routers);
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    }
    return output_port;
}

/* routes the current packet to the next stop */
void 
router_packet_send( router_state * s, 
		    tw_bf * bf, 
		     terminal_message * msg, tw_lp * lp)
{
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//   *(int *)bf = (int)0;
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   tw_stime ts;
   tw_event *e;
   terminal_message *m;

   int next_stop = -1, output_port = -1, output_chan = -1;
   float bandwidth = local_bandwidth;
   int path = routing;
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   int minimal_out_port = -1, nonmin_out_port = -1;
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   bf->c3 = 0;

   if(msg->last_hop == TERMINAL && routing == ADAPTIVE)
   {
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  // decide which routing to take
    int minimal_next_stop=get_next_stop(s, bf, msg, lp, MINIMAL);
    minimal_out_port = get_output_port(s, bf, msg, lp, minimal_next_stop);
    int nonmin_next_stop = get_next_stop(s, bf, msg, lp, NON_MINIMAL);
    nonmin_out_port = get_output_port(s, bf, msg, lp, nonmin_next_stop);
    int nonmin_port_count = s->vc_occupancy[nonmin_out_port];
    int min_port_count = s->vc_occupancy[minimal_out_port];
    int nonmin_vc = s->vc_occupancy[nonmin_out_port * num_vcs + 2];
    int min_vc = s->vc_occupancy[minimal_out_port * num_vcs + 1];

    // Adaptive routing condition from the dragonfly paper Page 83
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   // modified according to booksim adaptive routing condition
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   if((min_vc <= (nonmin_vc * 2 + adaptive_threshold) && minimal_out_port == nonmin_out_port)
               || (min_port_count <= (nonmin_port_count * 2 + adaptive_threshold) && minimal_out_port != nonmin_out_port))
        {
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	   msg->path_type = MINIMAL;
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           next_stop = minimal_next_stop;
           output_port = minimal_out_port;
           minimal_count++;
           msg->intm_group_id = -1;
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           if(msg->packet_ID == TRACK)
              printf("\n (%lf) [Router %d] Packet %d routing minimally ", tw_now(lp), (int)lp->gid, (int)msg->packet_ID);
        }
       else
         {
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	   msg->path_type = NON_MINIMAL;
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           next_stop = nonmin_next_stop;
           output_port = nonmin_out_port;
           nonmin_count++;
           if(msg->packet_ID == TRACK)
                printf("\n (%lf) [Router %d] Packet %d routing non-minimally ", tw_now(lp), (int)lp->gid, (int)msg->packet_ID);

         }
  }
  else
   {
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	msg->path_type = routing; /*defaults to the routing algorithm if we don't have adaptive routing here*/
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   	next_stop = get_next_stop(s, bf, msg, lp, path);
   	output_port = get_output_port(s, bf, msg, lp, next_stop); 
   }
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   output_chan = output_port * num_vcs;

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    // Even numbered channels for minimal routing
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   // Odd numbered channels for nonminimal routing
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   // Separate the queue occupancy into minimal and non minimal virtual channels if the min & non min
   // paths start at the same output port
   /*if((routing == ADAPTIVE) && (minimal_out_port == nonmin_out_port))
   {
        if(path == MINIMAL)
          output_chan = output_chan + 1;
        else
          if(path == NON_MINIMAL)
            output_chan = output_chan + 2;
   }*/

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   int global=0;
   int buf_size = local_vc_size;

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   assert(output_port != -1);
   assert(output_chan != -1);
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   // Allocate output Virtual Channel
  if(output_port >= num_routers && output_port < num_routers + num_global_channels)
  {
	 bandwidth = global_bandwidth;
	 global = 1;
	 buf_size = global_vc_size;
  }

  if(output_port >= num_routers + num_global_channels)
	buf_size = cn_vc_size;

   if(s->vc_occupancy[output_chan] >= buf_size)
    {
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	    printf("\n %lf Router %ld buffers overflowed from incoming terminals channel %d occupancy %d radix %d next_stop %d ", tw_now(lp),(long int) lp->gid, output_chan, s->vc_occupancy[output_chan], radix, next_stop);
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	    bf->c3 = 1;
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	    return;
	    //MPI_Finalize();
	    //exit(-1);
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    }

#if DEBUG
if( msg->packet_ID == TRACK && next_stop != msg->dest_terminal_id && msg->chunk_id == num_chunks-1)
  {
   printf("\n (%lf) [Router %d] Packet %lld being sent to intermediate group router %d Final destination terminal %d Output Channel Index %d Saved vc %d msg_intm_id %d \n", 
              tw_now(lp), (int)lp->gid, msg->packet_ID, next_stop, 
	      msg->dest_terminal_id, output_chan, msg->saved_vc, msg->intm_group_id);
  }
#endif
 // If source router doesn't have global channel and buffer space is available, then assign to appropriate intra-group virtual channel 
  msg->saved_available_time = s->next_output_available_time[output_port];
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  ts = g_tw_lookahead + 0.1 + ((1/bandwidth) * chunk_size) + tw_rand_exponential(lp->rng, (double)chunk_size/200);
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  s->next_output_available_time[output_port] = max(s->next_output_available_time[output_port], tw_now(lp));
  s->next_output_available_time[output_port] += ts;
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  // dest can be a router or a terminal, so we must check
  void * m_data;
  if (next_stop == msg->dest_terminal_id){
      e = model_net_method_event_new(next_stop, 
              s->next_output_available_time[output_port] - tw_now(lp), lp,
              DRAGONFLY, (void**)&m, &m_data);
  }
  else{
      e = tw_event_new(next_stop, s->next_output_available_time[output_port] - tw_now(lp), lp);
      m = tw_event_data(e);
      m_data = m+1;
  }
  memcpy(m, msg, sizeof(terminal_message));
  if (msg->remote_event_size_bytes){
      memcpy(m_data, msg+1, msg->remote_event_size_bytes);
  }
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  if(global)
    m->last_hop=GLOBAL;
  else
    m->last_hop = LOCAL;

  m->saved_vc = output_chan;
  msg->old_vc = output_chan;
  m->intm_lp_id = lp->gid;
  s->vc_occupancy[output_chan]++;

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  /* Determine the event type. If the packet has arrived at the final destination
     router then it should arrive at the destination terminal next. */
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  if(next_stop == msg->dest_terminal_id)
  {
    m->type = T_ARRIVE;

    if(s->vc_occupancy[output_chan] >= cn_vc_size * num_chunks)
      s->output_vc_state[output_chan] = VC_CREDIT;
  }
  else
  {
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    /* The packet has to be sent to another router */
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    m->type = R_ARRIVE;

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   /* If this is a global channel then the buffer space is different */
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   if( global )
   {
     if(s->vc_occupancy[output_chan] >= global_vc_size * num_chunks )
       s->output_vc_state[output_chan] = VC_CREDIT;
   }
  else
    {
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     /* buffer space is less for local channels */
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     if( s->vc_occupancy[output_chan] >= local_vc_size * num_chunks )
	s->output_vc_state[output_chan] = VC_CREDIT;
    }
  }
  tw_event_send(e);
  return;
}

/* Packet arrives at the router and a credit is sent back to the sending terminal/router */
void 
router_packet_receive( router_state * s, 
			tw_bf * bf, 
			terminal_message * msg, 
			tw_lp * lp )
{
    tw_event *e;
    terminal_message *m;
    tw_stime ts;

    msg->my_N_hop++;
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    ts = g_tw_lookahead + 0.1 + tw_rand_exponential(lp->rng, (double)MEAN_INTERVAL/200);
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    num_chunks = msg->packet_size/chunk_size;
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    if(msg->packet_ID == TRACK && msg->chunk_id == num_chunks-1)
       printf("\n packet %lld chunk %d received at router %d ", msg->packet_ID, msg->chunk_id, (int)lp->gid);
   
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    // router self message - no need for method_event
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    e = tw_event_new(lp->gid, ts, lp);
    m = tw_event_data(e);
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    memcpy(m, msg, sizeof(terminal_message) + msg->remote_event_size_bytes);
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    m->type = R_SEND;
    router_credit_send(s, bf, msg, lp);
    tw_event_send(e);  
    return;
}

/* sets up the router virtual channels, global channels, local channels, compute node channels */
void router_setup(router_state * r, tw_lp * lp)
{
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   codes_mapping_get_lp_info(lp->gid, lp_group_name, &mapping_grp_id, NULL,
           &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
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   r->router_id=mapping_rep_id + mapping_offset;
   r->group_id=r->router_id/num_routers;

   int i;
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   int router_offset=(r->router_id % num_routers) * (num_global_channels / 2) + 1;
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   r->global_channel = (int*)malloc(num_global_channels * sizeof(int));
   r->next_output_available_time = (tw_stime*)malloc(radix * sizeof(tw_stime));
   r->next_credit_available_time = (tw_stime*)malloc(radix * sizeof(tw_stime));
   r->vc_occupancy = (int*)malloc(radix * sizeof(int));
   r->output_vc_state = (int*)malloc(radix * sizeof(int));
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   for(i=0; i < radix; i++)
    {
       // Set credit & router occupancy
	r->next_output_available_time[i]=0;
        r->next_credit_available_time[i]=0;
        r->vc_occupancy[i]=0;
        r->output_vc_state[i]= VC_IDLE;
    }

   //round the number of global channels to the nearest even number
   for(i=0; i < num_global_channels; i++)
    {
      if(i % 2 != 0)
          {
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             r->global_channel[i]=(r->router_id + (router_offset * num_routers))%total_routers;
             router_offset++;
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          }
          else
           {
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             r->global_channel[i]=r->router_id - ((router_offset) * num_routers);
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           }
        if(r->global_channel[i]<0)
         {
           r->global_channel[i]=total_routers+r->global_channel[i]; 
	 }
    }
   return;
}	

/* Update the buffer space associated with this router LP */
void router_buf_update(router_state * s, tw_bf * bf, terminal_message * msg, tw_lp * lp)
{
    int msg_indx = msg->vc_index;
    s->vc_occupancy[msg_indx]--;
    s->output_vc_state[msg_indx] = VC_IDLE;
    return;
}

void router_event(router_state * s, tw_bf * bf, terminal_message * msg, tw_lp * lp)
{
  *(int *)bf = (int)0;
  switch(msg->type)
   {
	   case R_SEND: // Router has sent a packet to an intra-group router (local channel)
 		 router_packet_send(s, bf, msg, lp);
           break;

	   case R_ARRIVE: // Router has received a packet from an intra-group router (local channel)
	        router_packet_receive(s, bf, msg, lp);
	   break;
	
	   case R_BUFFER:
	        router_buf_update(s, bf, msg, lp);
	   break;

	   default:
		  printf("\n (%lf) [Router %d] Router Message type not supported %d dest terminal id %d packet ID %d ", tw_now(lp), (int)lp->gid, msg->type, (int)msg->dest_terminal_id, (int)msg->packet_ID);
	   break;
   }	   
}

/* Reverse computation handler for a terminal event */
void terminal_rc_event_handler(terminal_state * s, tw_bf * bf, terminal_message * msg, tw_lp * lp)
{
   switch(msg->type)
   {
	   case T_GENERATE:
		 {
		 int i;
		 tw_rand_reverse_unif(lp->rng);

		 for(i = 0; i < num_chunks; i++)
                  tw_rand_reverse_unif(lp->rng);
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		 mn_stats* stat;
		 stat = model_net_find_stats(msg->category, s->dragonfly_stats_array);
		 stat->send_count--;
		 stat->send_bytes -= msg->packet_size;
		 stat->send_time -= (1/cn_bandwidth) * msg->packet_size;
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		 }
	   break;
	   
	   case T_SEND:
	         {
	           s->terminal_available_time = msg->saved_available_time;
		   tw_rand_reverse_unif(lp->rng);	
		   int vc = msg->saved_vc;
		   s->vc_occupancy[vc]--;
		   s->packet_counter--;
		   s->output_vc_state[vc] = VC_IDLE;
		 }
	   break;

	   case T_ARRIVE:
	   	 {
		   tw_rand_reverse_unif(lp->rng);
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		   s->next_credit_available_time = msg->saved_credit_time;
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		   if(bf->c2)
		   {
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		    mn_stats* stat;
		    stat = model_net_find_stats(msg->category, s->dragonfly_stats_array);
		    stat->recv_count--;
		    stat->recv_bytes -= msg->packet_size;
		    stat->recv_time -= tw_now(lp) - msg->travel_start_time;
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		    N_finished_packets--;
		    dragonfly_total_time -= (tw_now(lp) - msg->travel_start_time);
		    total_hops -= msg->my_N_hop;
		   if(bf->c3)
		         dragonfly_max_latency = msg->saved_available_time;
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		   }
		    
		   msg->my_N_hop--;
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		 }
           break;

	   case T_BUFFER:
	        {
		   int msg_indx = msg->vc_index;
		   s->vc_occupancy[msg_indx]++;
		   
		   if(s->vc_occupancy[msg_indx] == cn_vc_size * num_chunks)
			s->output_vc_state[msg_indx] = VC_CREDIT;
	     }  
	   break;
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          case D_COLLECTIVE_INIT:
                {
                    s->collective_init_time = msg->saved_collective_init_time;
                }
          break;

          case D_COLLECTIVE_FAN_IN:
                {
                   int i;
                   s->num_fan_nodes--;
                   if(bf->c1)
                    {
                        s->num_fan_nodes = msg->saved_fan_nodes;
                    }
                   if(bf->c2)
                     {
                        s->num_fan_nodes = msg->saved_fan_nodes;
                        for( i = 0; i < s->num_children; i++ )
                            tw_rand_reverse_unif(lp->rng);
                     }
                }
        break;

        case D_COLLECTIVE_FAN_OUT:
                {
                 int i;
                 if(bf->c1)
                    {
                        for( i = 0; i < s->num_children; i++ )
                            tw_rand_reverse_unif(lp->rng);
                    }
                }	 
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   }
}

/* Reverse computation handler for a router event */
void router_rc_event_handler(router_state * s, tw_bf * bf, terminal_message * msg, tw_lp * lp)
{
  switch(msg->type)
    {
            case R_SEND:
		    {
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			if(msg->path_type == NON_MINIMAL && bf->c2)
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			   tw_rand_reverse_unif(lp->rng);
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			if(routing == ADAPTIVE && msg->path_type == MINIMAL)
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                                minimal_count--;
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                        if(routing == ADAPTIVE && msg->path_type == NON_MINIMAL)
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                                nonmin_count--;
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			if(bf->c3)
			   return;
			    
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		        tw_rand_reverse_unif(lp->rng);
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			int output_chan = msg->old_vc;
			int output_port = output_chan / num_vcs;

			s->next_output_available_time[output_port] = msg->saved_available_time;
			s->vc_occupancy[output_chan]--;
			s->output_vc_state[output_chan]=VC_IDLE;
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		    }
	    break;

	    case R_ARRIVE:
	    	    {
			msg->my_N_hop--;
			tw_rand_reverse_unif(lp->rng);
			tw_rand_reverse_unif(lp->rng);
			int output_port = msg->saved_vc/num_vcs;
			s->next_credit_available_time[output_port] = msg->saved_available_time;
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                        if (msg->chunk_id == num_chunks-1 && 
                                msg->remote_event_size_bytes && 
                                msg->is_pull){
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                            int net_id = model_net_get_id(LP_METHOD_NM);
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                            model_net_event_rc(net_id, lp, msg->pull_size);
                        }
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		    }
	    break;

	    case R_BUFFER:
	    	   {
		      int msg_indx = msg->vc_index;
                      s->vc_occupancy[msg_indx]++;

                      int buf = local_vc_size;

		      if(msg->last_hop == GLOBAL)
			 buf = global_vc_size;
		       else if(msg->last_hop == TERMINAL)
			 buf = cn_vc_size;
	 
		      if(s->vc_occupancy[msg_indx] >= buf * num_chunks)
                          s->output_vc_state[msg_indx] = VC_CREDIT;

		   }
	    break;
	  
    }
}
/* dragonfly compute node and router LP types */
tw_lptype dragonfly_lps[] =
{
   // Terminal handling functions
   {
    (init_f)terminal_init,
    (event_f) terminal_event,
    (revent_f) terminal_rc_event_handler,
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    (final_f) dragonfly_terminal_final,
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    (map_f) codes_mapping,
    sizeof(terminal_state)
    },
   {
     (init_f) router_setup,
     (event_f) router_event,
     (revent_f) router_rc_event_handler,
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     (final_f) dragonfly_router_final,
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     (map_f) codes_mapping,
     sizeof(router_state),
   },
   {0},
};

/* returns the dragonfly lp type for lp registration */
static const tw_lptype* dragonfly_get_cn_lp_type(void)
{
	   return(&dragonfly_lps[0]);
}
static const tw_lptype* dragonfly_get_router_lp_type(void)
{
	           return(&dragonfly_lps[1]);
}          

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static tw_lpid dragonfly_find_local_device(tw_lp *sender)
{
     int mapping_grp_id, mapping_rep_id, mapping_type_id, mapping_offset;
     tw_lpid dest_id;

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     codes_mapping_get_lp_info(sender->gid, lp_group_name, &mapping_grp_id,
             NULL, &mapping_type_id, NULL, &mapping_rep_id, &mapping_offset);
     codes_mapping_get_lp_id(lp_group_name, LP_CONFIG_NM, NULL, 1,
             mapping_rep_id, mapping_offset, &dest_id);
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    return(dest_id);
}
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/* data structure for dragonfly statistics */
struct model_net_method dragonfly_method =
{
    .mn_setup = dragonfly_setup,
    .model_net_method_packet_event = dragonfly_packet_event,
    .model_net_method_packet_event_rc = dragonfly_packet_event_rc,
    .mn_get_lp_type = dragonfly_get_cn_lp_type,
    .mn_get_msg_sz = dragonfly_get_msg_sz,
    .mn_report_stats = dragonfly_report_stats,
    .model_net_method_find_local_device = dragonfly_find_local_device,
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    .mn_collective_call = dragonfly_collective,
    .mn_collective_call_rc = dragonfly_collective_rc   
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};

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/*
 * Local variables:
 *  c-indent-level: 4
 *  c-basic-offset: 4
 * End:
 *
 * vim: ts=8 sts=4 sw=4 expandtab
 */