1# Copyright (c) 2010 Advanced Micro Devices, Inc.
2# All rights reserved.
3#
4# Redistribution and use in source and binary forms, with or without
5# modification, are permitted provided that the following conditions are
6# met: redistributions of source code must retain the above copyright
7# notice, this list of conditions and the following disclaimer;
8# redistributions in binary form must reproduce the above copyright

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34class Crossbar(SimpleTopology):
35 description='Crossbar'
36
37 def makeTopology(self, options, network, IntLink, ExtLink, Router):
38 # Create an individual router for each controller plus one more for
39 # the centralized crossbar. The large numbers of routers are needed
40 # because external links do not model outgoing bandwidth in the
41 # simple network, but internal links do.
42 # For garnet, one router suffices, use CrossbarGarnet.py
43
44 routers = [Router(router_id=i) for i in range(len(self.nodes)+1)]
45 xbar = routers[len(self.nodes)] # the crossbar router is the last router created
46 network.routers = routers
47
48 ext_links = [ExtLink(link_id=i, ext_node=n, int_node=routers[i])
49 for (i, n) in enumerate(self.nodes)]
50 network.ext_links = ext_links
51
52 link_count = len(self.nodes)
53
54 int_links = []
55 for i in range(len(self.nodes)):
56 int_links.append(IntLink(link_id=(link_count+i),
57 src_node=routers[i],
58 dst_node=xbar))
59
60 link_count += len(self.nodes)
61
62 for i in range(len(self.nodes)):
63 int_links.append(IntLink(link_id=(link_count+i),
64 src_node=xbar,
65 dst_node=routers[i]))
66
67 network.int_links = int_links