This commit includes example tutorials and solutions for P4D2 2017. (#29)
- Added example P4 programs for ipv4_forwarding, mri, arp, calc - Added python code to invoke compiler, start bmv2, run mininet - Added solutions to above programs - Added README files that describe exercises
This commit is contained in:
Robert Soulé
committed by
Nate Foster
Nate Foster
parent
5616d53a1a
commit
a78dba7a5a
103
P4D2_2017/utils/mininet/appcontroller.py
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103
P4D2_2017/utils/mininet/appcontroller.py
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import subprocess
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from shortest_path import ShortestPath
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class AppController:
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def __init__(self, manifest=None, target=None, topo=None, net=None, links=None):
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self.manifest = manifest
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self.target = target
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self.conf = manifest['targets'][target]
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self.topo = topo
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self.net = net
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self.links = links
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def read_entries(self, filename):
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entries = []
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with open(filename, 'r') as f:
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for line in f:
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line = line.strip()
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if line == '': continue
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entries.append(line)
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return entries
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def add_entries(self, thrift_port=9090, sw=None, entries=None):
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assert entries
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if sw: thrift_port = sw.thrift_port
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print '\n'.join(entries)
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p = subprocess.Popen(['simple_switch_CLI', '--thrift-port', str(thrift_port)], stdin=subprocess.PIPE)
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p.communicate(input='\n'.join(entries))
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def read_register(self, register, idx, thrift_port=9090, sw=None):
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if sw: thrift_port = sw.thrift_port
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p = subprocess.Popen(['simple_switch_CLI', '--thrift-port', str(thrift_port)], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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stdout, stderr = p.communicate(input="register_read %s %d" % (register, idx))
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reg_val = filter(lambda l: ' %s[%d]' % (register, idx) in l, stdout.split('\n'))[0].split('= ', 1)[1]
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return long(reg_val)
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def start(self):
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shortestpath = ShortestPath(self.links)
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entries = {}
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for sw in self.topo.switches():
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entries[sw] = []
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if 'switches' in self.conf and sw in self.conf['switches'] and 'entries' in self.conf['switches'][sw]:
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extra_entries = self.conf['switches'][sw]['entries']
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if type(extra_entries) == list: # array of entries
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entries[sw] += extra_entries
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else: # path to file that contains entries
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entries[sw] += self.read_entries(extra_entries)
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#entries[sw] += [
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# 'table_set_default send_frame _drop',
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# 'table_set_default forward _drop',
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# 'table_set_default ipv4_lpm _drop']
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for host_name in self.topo._host_links:
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h = self.net.get(host_name)
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for link in self.topo._host_links[host_name].values():
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sw = link['sw']
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#entries[sw].append('table_add send_frame rewrite_mac %d => %s' % (link['sw_port'], link['sw_mac']))
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#entries[sw].append('table_add forward set_dmac %s => %s' % (link['host_ip'], link['host_mac']))
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#entries[sw].append('table_add ipv4_lpm set_nhop %s/32 => %s %d' % (link['host_ip'], link['host_ip'], link['sw_port']))
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iface = h.intfNames()[link['idx']]
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# use mininet to set ip and mac to let it know the change
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h.setIP(link['host_ip'], 16)
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h.setMAC(link['host_mac'])
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#h.cmd('ifconfig %s %s hw ether %s' % (iface, link['host_ip'], link['host_mac']))
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h.cmd('arp -i %s -s %s %s' % (iface, link['sw_ip'], link['sw_mac']))
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h.cmd('ethtool --offload %s rx off tx off' % iface)
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h.cmd('ip route add %s dev %s' % (link['sw_ip'], iface))
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h.setDefaultRoute("via %s" % link['sw_ip'])
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for h in self.net.hosts:
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h_link = self.topo._host_links[h.name].values()[0]
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for sw in self.net.switches:
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path = shortestpath.get(sw.name, h.name, exclude=lambda n: n[0]=='h')
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if not path: continue
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if not path[1][0] == 's': continue # next hop is a switch
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sw_link = self.topo._sw_links[sw.name][path[1]]
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#entries[sw.name].append('table_add send_frame rewrite_mac %d => %s' % (sw_link[0]['port'], sw_link[0]['mac']))
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#entries[sw.name].append('table_add forward set_dmac %s => %s' % (h_link['host_ip'], sw_link[1]['mac']))
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#entries[sw.name].append('table_add ipv4_lpm set_nhop %s/32 => %s %d' % (h_link['host_ip'], h_link['host_ip'], sw_link[0]['port']))
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for h2 in self.net.hosts:
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if h == h2: continue
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path = shortestpath.get(h.name, h2.name, exclude=lambda n: n[0]=='h')
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if not path: continue
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h_link = self.topo._host_links[h.name][path[1]]
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h2_link = self.topo._host_links[h2.name].values()[0]
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h.cmd('ip route add %s via %s' % (h2_link['host_ip'], h_link['sw_ip']))
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print "**********"
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print "Configuring entries in p4 tables"
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for sw_name in entries:
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print
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print "Configuring switch... %s" % sw_name
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sw = self.net.get(sw_name)
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self.add_entries(sw=sw, entries=entries[sw_name])
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print "Configuration complete."
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print "**********"
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def stop(self):
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pass
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