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# This is an example of an n port network switch to work in dist-gem5.
# Users can extend this to have different different topologies

import argparse
import sys

import m5
from m5.defines import buildEnv
from m5.objects import *
from m5.util import addToPath, fatal

addToPath("../")

from common import Simulation
from common import Options


def build_switch(args):
    # instantiate an EtherSwitch
    switch = EtherSwitch()
    # instantiate distEtherLinks to connect switch ports
    # to other gem5 instances
    switch.portlink = [
        DistEtherLink(
            speed=args.ethernet_linkspeed,
            delay=args.ethernet_linkdelay,
            dist_rank=args.dist_rank,
            dist_size=args.dist_size,
            server_name=args.dist_server_name,
            server_port=args.dist_server_port,
            sync_start=args.dist_sync_start,
            sync_repeat=args.dist_sync_repeat,
            is_switch=True,
            num_nodes=args.dist_size,
        )
        for i in range(args.dist_size)
    ]

    for i, link in enumerate(switch.portlink):
        link.int0 = switch.interface[i]

    return switch


def main():
    # Add options
    parser = argparse.ArgumentParser()
    Options.addCommonOptions(parser)
    Options.addFSOptions(parser)
    args = parser.parse_args()

    system = build_switch(args)
    root = Root(full_system=True, system=system)
    Simulation.run(args, root, None, None)


if __name__ == "__m5_main__":
    main()