IP Flow Hash Config fixes
- the flow hash config is (and was) cached on the load-balance object so the fib_table_t struct is not used a switch time. Therefore changes to the table's flow hash config need to be propagated to all load-balances and hance all FIB entries in the table. - enable API for setting the IPv6 table flow hash config - use only the hash config in the fib_table_t object and not on the ipX_fib_t - add tests. Change-Id: Ib804c11162c6d4972c764957562c372f663e05d4 Signed-off-by: Neale Ranns <nranns@cisco.com>
This commit is contained in:
Neale Ranns
committed by
Damjan Marion
Damjan Marion
parent
9806eae1f5
commit
227038a444
137
test/test_ip4.py
137
test/test_ip4.py
@ -766,5 +766,142 @@ class TestIPSubNets(VppTestCase):
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rx = self.pg1.get_capture(1)
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class TestIPLoadBalance(VppTestCase):
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""" IPv4 Load-Balancing """
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def setUp(self):
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super(TestIPLoadBalance, self).setUp()
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self.create_pg_interfaces(range(5))
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for i in self.pg_interfaces:
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i.admin_up()
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i.config_ip4()
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i.resolve_arp()
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def tearDown(self):
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super(TestIPLoadBalance, self).tearDown()
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for i in self.pg_interfaces:
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i.unconfig_ip4()
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i.admin_down()
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def send_and_expect_load_balancing(self, input, pkts, outputs):
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input.add_stream(pkts)
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self.pg_enable_capture(self.pg_interfaces)
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self.pg_start()
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for oo in outputs:
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rx = oo._get_capture(1)
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self.assertNotEqual(0, len(rx))
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def test_ip_load_balance(self):
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""" IP Load-Balancing """
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#
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# An array of packets that differ only in the destination port
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#
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port_pkts = []
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#
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# An array of packets that differ only in the source address
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#
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src_pkts = []
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for ii in range(65):
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port_pkts.append((Ether(src=self.pg0.remote_mac,
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dst=self.pg0.local_mac) /
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IP(dst="10.0.0.1", src="20.0.0.1") /
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UDP(sport=1234, dport=1234 + ii) /
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Raw('\xa5' * 100)))
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src_pkts.append((Ether(src=self.pg0.remote_mac,
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dst=self.pg0.local_mac) /
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IP(dst="10.0.0.1", src="20.0.0.%d" % ii) /
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UDP(sport=1234, dport=1234) /
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Raw('\xa5' * 100)))
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route_10_0_0_1 = VppIpRoute(self, "10.0.0.1", 32,
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[VppRoutePath(self.pg1.remote_ip4,
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self.pg1.sw_if_index),
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VppRoutePath(self.pg2.remote_ip4,
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self.pg2.sw_if_index)])
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route_10_0_0_1.add_vpp_config()
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#
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# inject the packet on pg0 - expect load-balancing across the 2 paths
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# - since the default hash config is to use IP src,dst and port
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# src,dst
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# We are not going to ensure equal amounts of packets across each link,
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# since the hash algorithm is statistical and therefore this can never
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# be guaranteed. But wuth 64 different packets we do expect some
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# balancing. So instead just ensure there is traffic on each link.
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#
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self.send_and_expect_load_balancing(self.pg0, port_pkts,
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[self.pg1, self.pg2])
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self.send_and_expect_load_balancing(self.pg0, src_pkts,
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[self.pg1, self.pg2])
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#
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# change the flow hash config so it's only IP src,dst
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# - now only the stream with differing source address will
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# load-balance
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#
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self.vapi.set_ip_flow_hash(0, src=1, dst=1, sport=0, dport=0)
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self.send_and_expect_load_balancing(self.pg0, src_pkts,
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[self.pg1, self.pg2])
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self.pg0.add_stream(port_pkts)
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self.pg_enable_capture(self.pg_interfaces)
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self.pg_start()
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rx = self.pg2.get_capture(len(port_pkts))
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#
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# change the flow hash config back to defaults
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#
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self.vapi.set_ip_flow_hash(0, src=1, dst=1, sport=1, dport=1)
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#
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# Recursive prefixes
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# - testing that 2 stages of load-balancing occurs and there is no
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# polarisation (i.e. only 2 of 4 paths are used)
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#
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port_pkts = []
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src_pkts = []
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for ii in range(257):
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port_pkts.append((Ether(src=self.pg0.remote_mac,
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dst=self.pg0.local_mac) /
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IP(dst="1.1.1.1", src="20.0.0.1") /
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UDP(sport=1234, dport=1234 + ii) /
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Raw('\xa5' * 100)))
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src_pkts.append((Ether(src=self.pg0.remote_mac,
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dst=self.pg0.local_mac) /
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IP(dst="1.1.1.1", src="20.0.0.%d" % ii) /
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UDP(sport=1234, dport=1234) /
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Raw('\xa5' * 100)))
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route_10_0_0_2 = VppIpRoute(self, "10.0.0.2", 32,
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[VppRoutePath(self.pg3.remote_ip4,
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self.pg3.sw_if_index),
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VppRoutePath(self.pg4.remote_ip4,
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self.pg4.sw_if_index)])
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route_10_0_0_2.add_vpp_config()
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route_1_1_1_1 = VppIpRoute(self, "1.1.1.1", 32,
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[VppRoutePath("10.0.0.2", 0xffffffff),
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VppRoutePath("10.0.0.1", 0xffffffff)])
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route_1_1_1_1.add_vpp_config()
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#
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# inject the packet on pg0 - expect load-balancing across all 4 paths
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#
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self.vapi.cli("clear trace")
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self.send_and_expect_load_balancing(self.pg0, port_pkts,
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[self.pg1, self.pg2,
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self.pg3, self.pg4])
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self.send_and_expect_load_balancing(self.pg0, src_pkts,
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[self.pg1, self.pg2,
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self.pg3, self.pg4])
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if __name__ == '__main__':
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unittest.main(testRunner=VppTestRunner)
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