mirror of https://github.com/m-labs/artiq
84 lines
2.3 KiB
Python
Executable File
84 lines
2.3 KiB
Python
Executable File
#!/usr/bin/env python3
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import argparse
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def get_argparser():
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parser = argparse.ArgumentParser(description="ARTIQ DRTIO routing table "
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"manipulation tool")
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parser.add_argument("file", metavar="FILE", type=str,
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help="target file")
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action = parser.add_subparsers(dest="action")
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action.required = True
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action.add_parser("init", help="create a new empty routing table")
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action.add_parser("show", help="show contents of routing table")
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a_set = action.add_parser("set", help="set routing table entry")
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a_set.add_argument("destination", metavar="DESTINATION", type=int,
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help="destination to operate on")
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a_set.add_argument("hop", metavar="HOP", type=int, nargs="*",
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help="hop(s) to the destination")
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return parser
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DEST_COUNT = 256
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MAX_HOPS = 32
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def init(filename):
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with open(filename, "wb") as f:
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f.write(b"\xff"*(DEST_COUNT*MAX_HOPS))
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def show_routes(filename):
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routes = []
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with open(filename, "rb") as f:
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for i in range(DEST_COUNT):
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hops = [int.from_bytes(f.read(1), "big") for j in range(MAX_HOPS)]
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routes.append(hops)
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for destination, route in enumerate(routes):
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if route[0] != 0xff:
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fmt = "{:3d}:".format(destination)
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for hop in route:
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if hop == 0xff:
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break
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fmt += " {:3d}".format(hop)
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print(fmt)
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def set_route(filename, destination, hops):
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with open(filename, "r+b") as f:
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if destination >= DEST_COUNT:
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raise ValueError("destination must be less than {}".format(DEST_COUNT))
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f.seek(destination*MAX_HOPS)
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if len(hops) + 1 >= MAX_HOPS:
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raise ValueError("too many hops")
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for hop in hops:
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if hop >= 0xff:
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raise ValueError("all hops must be less than 255")
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hops = hops + [0xff]*(MAX_HOPS-len(hops))
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f.write(bytes(hops))
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def main():
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args = get_argparser().parse_args()
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if args.action == "init":
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init(args.file)
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elif args.action == "show":
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show_routes(args.file)
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elif args.action == "set":
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set_route(args.file, args.destination, args.hop)
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else:
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raise ValueError
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if __name__ == "__main__":
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main()
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