AT_BANNER([bfd])

m4_define([BFD_CHECK], [
AT_CHECK([ovs-appctl bfd/show $1 | sed -e '/Time:/d' | sed -e '/Discriminator/d' | sed -e '/Interval:/d'],[0],
[dnl
	Forwarding: $2
	Detect Multiplier: 3
	Concatenated Path Down: $3

	Local Flags: $4
	Local Session State: $5
	Local Diagnostic: $6

	Remote Flags: $7
	Remote Session State: $8
	Remote Diagnostic: $9
])
])

m4_define([BFD_CHECK_TX], [
AT_CHECK([ovs-appctl bfd/show $1 | sed -n '/TX Interval/p'],[0],
[dnl
	TX Interval: Approx $2
	Local Minimum TX Interval: $3
	Remote Minimum TX Interval: $4
])
])

m4_define([BFD_CHECK_RX], [
AT_CHECK([ovs-appctl bfd/show $1 | sed -n '/RX Interval/p'],[0],
[dnl
	RX Interval: Approx $2
	Local Minimum RX Interval: $3
	Remote Minimum RX Interval: $4
])
])
AT_SETUP([bfd - basic config on different bridges])
#Create 2 bridges connected by patch ports and enable BFD
OVS_VSWITCHD_START(
   [add-br br1 -- \
       set bridge br1 datapath-type=dummy \
       other-config:hwaddr=aa:55:aa:56:00:00 -- \
    add-port br1 p1 -- set Interface p1 type=patch \
       options:peer=p0 -- \
    add-port br0 p0 -- set Interface p0 type=patch \
       options:peer=p1 -- \
    set Interface p0 bfd:enable=true -- \
    set Interface p1 bfd:enable=true ])
ovs-appctl time/stop
for i in `seq 0 40`; do ovs-appctl time/warp 100; done

#Verify that BFD has been enabled on both interfaces.
BFD_CHECK([p1], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
BFD_CHECK([p0], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])

AT_CHECK([ ovs-vsctl set interface p0 bfd:enable=false])
for i in `seq 0 40`; do ovs-appctl time/warp 100; done
BFD_CHECK([p1], [false], [false], [none], [down], [Control Detection Time Expired], [none], [down], [No Diagnostic])

AT_CHECK([ ovs-vsctl set interface p0 bfd:enable=true])
for i in `seq 0 40`; do ovs-appctl time/warp 100; done
BFD_CHECK([p1], [true], [false], [none], [up], [Control Detection Time Expired], [none], [up], [No Diagnostic])
BFD_CHECK([p0], [true], [false], [none], [up], [No Diagnostic], [none], [up], [Control Detection Time Expired])

ovs-vsctl del-br br0
AT_CHECK([ovs-appctl bfd/show p0], [2],[ignore], [no such bfd object
ovs-appctl: ovs-vswitchd: server returned an error
])
ovs-vsctl del-br br1
#Check that the entries are gone.
AT_CHECK([ovs-appctl bfd/show p1], [2],[ignore], [no such bfd object
ovs-appctl: ovs-vswitchd: server returned an error
])

OVS_VSWITCHD_STOP
AT_CLEANUP


AT_SETUP([bfd - Verify tunnel down detection])
#Create 3 bridges - br-bfd0, br-bfd1 and br-sw which is midway between the two. br2 is
#connected to br-bfd0 and br-bfd1 through patch ports p0-2 and p1-2. Enable BFD on
#interfaces in br-bfd0 and br-bfd1. When br-sw is dropping all packets, BFD should detect
# that the tunnel is down, and come back up when br-sw is working fine.

OVS_VSWITCHD_START(
   [add-br br-bfd0 -- \
       set bridge br-bfd0 datapath-type=dummy \
       other-config:hwaddr=aa:55:aa:56:00:00 -- \
    add-br br-bfd1 -- \
       set bridge br-bfd1 datapath-type=dummy \
       other-config:hwaddr=aa:55:aa:57:00:00 -- \
    add-br br-sw -- \
       set bridge br-sw datapath-type=dummy \
       other-config:hwaddr=aa:55:aa:58:00:00 -- \
    add-port br-sw p1-sw -- set Interface p1-sw type=patch \
       options:peer=p1 -- \
    add-port br-sw p0-sw -- set Interface p0-sw type=patch \
       options:peer=p0 -- \
    add-port br-bfd1 p1 -- set Interface p1 type=patch \
       options:peer=p1-sw bfd:enable=true -- \
    add-port br-bfd0 p0 -- set Interface p0 type=patch \
       options:peer=p0-sw bfd:enable=true --])

ovs-appctl time/stop

#Create 2 bridges connected by patch ports and enable BFD

AT_CHECK([ovs-ofctl add-flow br-sw 'priority=0,actions=NORMAL'])
#Verify that BFD is enabled.
for i in `seq 0 40`; do ovs-appctl time/warp 100; done
BFD_CHECK([p1], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
BFD_CHECK([p0], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])

#Drop all packets in the br-sw bridge so that the tunnel is down.
AT_CHECK([ ovs-ofctl add-flow br-sw 'priority=5,actions=drop' ])
for i in `seq 0 40`; do ovs-appctl time/warp 100; done
BFD_CHECK([p1], [false], [false], [none], [down], [Control Detection Time Expired], [none], [down], [No Diagnostic])
BFD_CHECK([p0], [false], [false], [none], [down], [Control Detection Time Expired], [none], [down], [No Diagnostic])

#Delete the added flow
AT_CHECK([ovs-ofctl del-flows br-sw], [0])
AT_CHECK([ovs-ofctl add-flow br-sw 'priority=0,actions=NORMAL'])
#Verify that BFD is back up again.
for i in `seq 0 40`; do ovs-appctl time/warp 100; done

BFD_CHECK([p1], [true], [false], [none], [up], [Control Detection Time Expired], [none], [up], [Control Detection Time Expired])
BFD_CHECK([p0], [true], [false], [none], [up], [Control Detection Time Expired], [none], [up], [Control Detection Time Expired])

#Now, Verify one-side tunnel down detection
#When br-sw is dropping packets from one end, BFD should detect
# that the tunnel is down, and come back up when br-sw is working fine.

#Bring down the br-bfd1 - br-sw link. So BFD packets will be sent from p0,
# but not received by p1. p0 will receive all BFD packets from p1.

AT_CHECK([ ovs-ofctl add-flow br-sw 'in_port=1,priority=5,actions=drop'])
for i in `seq 0 40`; do ovs-appctl time/warp 100; done
# Make sure p1 BFD state is down since it received no BFD packets.
BFD_CHECK([p1], [false], [false], [none], [down], [Control Detection Time Expired], [none], [down], [No Diagnostic])
for i in `seq 0 40`; do ovs-appctl time/warp 100; done
# p0 will be in init state once it receives "down" BFD message from p1.
BFD_CHECK([p0], [false], [false], [none], [init], [Neighbor Signaled Session Down], [none], [down], [Control Detection Time Expired])

AT_CHECK([ovs-ofctl del-flows br-sw])
AT_CHECK([ovs-ofctl add-flow br-sw 'priority=0,actions=NORMAL'])
#Ensure that BFD is back up again.

for i in `seq 0 10`; do ovs-appctl time/warp 100; done
#Bring down the br-bfd0 - br-sw link
AT_CHECK([ ovs-ofctl add-flow br-sw 'in_port=2,priority=5,actions=drop'])
for i in `seq 0 40`; do ovs-appctl time/warp 100; done
BFD_CHECK([p0], [false], [false], [none], [down], [Control Detection Time Expired], [none], [down], [No Diagnostic])
for i in `seq 0 40`; do ovs-appctl time/warp 100; done
BFD_CHECK([p1], [false], [false], [none], [init], [Neighbor Signaled Session Down], [none], [down], [Control Detection Time Expired])
OVS_VSWITCHD_STOP
AT_CLEANUP


AT_SETUP([bfd - concatenated path down])
#Create 2 bridges connected by patch ports and enable BFD
OVS_VSWITCHD_START()
ovs-appctl time/stop
AT_CHECK([ ovs-vsctl -- add-br br1 -- \
           set bridge br1 datapath-type=dummy \
           other-config:hwaddr=aa:55:aa:56:00:00 ])
AT_CHECK([ ovs-vsctl -- add-port br1 p1 -- set Interface p1 type=patch \
           options:peer=p0 ])
AT_CHECK([ ovs-vsctl -- add-port br0 p0 -- set Interface p0 type=patch \
           options:peer=p1 ])
AT_CHECK([ ovs-vsctl -- set interface p0 bfd:enable=true ])
AT_CHECK([ ovs-vsctl -- set interface p1 bfd:enable=true ])
for i in `seq 0 40`; do ovs-appctl time/warp 100; done

#Verify that BFD has been enabled on both interfaces.
BFD_CHECK([p1], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
BFD_CHECK([p0], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])

#Set cpath_down to true on one interface, make sure the remote interface updates its values.
AT_CHECK([ovs-vsctl set interface p0 bfd:cpath_down=true])
for i in `seq 0 40`; do ovs-appctl time/warp 100; done
BFD_CHECK([p1], [false], [false], [none], [up], [No Diagnostic], [none], [up], [Concatenated Path Down])
OVS_VSWITCHD_STOP
AT_CLEANUP


AT_SETUP([bfd - Edit the Min Tx/Rx values])
#Create 2 bridges connected by patch ports and enable BFD
OVS_VSWITCHD_START()
ovs-appctl time/stop
AT_CHECK([ ovs-vsctl -- add-br br1 -- \
           set bridge br1 datapath-type=dummy ])
AT_CHECK([ ovs-vsctl -- add-port br1 p1 -- set Interface p1 type=patch \
           options:peer=p0 ])
AT_CHECK([ ovs-vsctl -- add-port br0 p0 -- set Interface p0 type=patch \
           options:peer=p1 ])
AT_CHECK([ ovs-vsctl -- set interface p0 bfd:enable=true ])
AT_CHECK([ ovs-vsctl -- set interface p1 bfd:enable=true ])
for i in `seq 0 30`; do ovs-appctl time/warp 100; done
#Verify that BFD has been enabled on both interfaces.
BFD_CHECK([p1], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
BFD_CHECK([p0], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
#Edit the min Tx value.
AT_CHECK([ovs-vsctl set interface p0 bfd:min_tx=200])
for i in `seq 0 20`; do ovs-appctl time/warp 100; done
BFD_CHECK_TX([p0], [1000ms], [200ms], [100ms])
BFD_CHECK_TX([p1], [1000ms], [100ms], [200ms])

#Edit the min Rx value.
AT_CHECK([ovs-vsctl set interface p1 bfd:min_rx=300])
for i in `seq 0 20`; do ovs-appctl time/warp 100; done
BFD_CHECK_RX([p1], [300ms], [300ms], [1000ms])
BFD_CHECK_RX([p0], [1000ms], [1000ms], [300ms])

OVS_VSWITCHD_STOP
AT_CLEANUP

AT_SETUP([bfd - check_tnl_key])
OVS_VSWITCHD_START([add-port br0 p1 -- set Interface p1 type=gre \
                    options:remote_ip=2.2.2.2 options:key=1 ofport_request=1 -- \
                    set interface p1 bfd:enable=true -- \
                    set bridge br0 fail-mode=standalone])

# by default check_tnl_key is false. so we should process a bfd packet with tun_id=1.
AT_CHECK([ovs-appctl ofproto/trace ovs-dummy 'tunnel(tun_id=0x1,src=2.2.2.2,dst=2.2.2.1,tos=0x0,ttl=64,flags(key)),in_port(1),skb_mark(0/0),eth(src=00:11:22:33:44:55,dst=00:23:20:00:00:01),eth_type(0x0800),ipv4(src=169.254.1.0/0.0.0.0,dst=169.254.1.1/0.0.0.0,proto=17/0xff,tos=0/0,ttl=255/0,frag=no/0xff),udp(src=49152/0,dst=3784/0xffff)' -generate], [0], [stdout])
# check that the packet should be handled as BFD packet.
AT_CHECK([tail -2 stdout], [0], [dnl
This flow is handled by the userspace slow path because it:
	- Consists of BFD packets.
], [])

# turn on the check_tnl_key.
AT_CHECK([ovs-vsctl set interface p1 bfd:check_tnl_key=true])
AT_CHECK([ovs-appctl ofproto/trace ovs-dummy 'tunnel(tun_id=0x1,src=2.2.2.2,dst=2.2.2.1,tos=0x0,ttl=64,flags(key)),in_port(1),skb_mark(0/0),eth(src=00:11:22:33:44:55,dst=00:23:20:00:00:01),eth_type(0x0800),ipv4(src=169.254.1.0/0.0.0.0,dst=169.254.1.1/0.0.0.0,proto=17/0xff,tos=0/0,ttl=255/0,frag=no/0xff),udp(src=49152/0,dst=3784/0xffff)' -generate], [0], [stdout])
# check that the packet should be handled as normal packet.
AT_CHECK([tail -1 stdout], [0],[dnl
Datapath actions: 100
], [])

# set the tunnel key to 0.
AT_CHECK([ovs-vsctl set interface p1 options:key=0])
AT_CHECK([ovs-appctl ofproto/trace ovs-dummy 'tunnel(tun_id=0x0,src=2.2.2.2,dst=2.2.2.1,tos=0x0,ttl=64,flags(key)),in_port(1),skb_mark(0/0),eth(src=00:11:22:33:44:55,dst=00:23:20:00:00:01),eth_type(0x0800),ipv4(src=169.254.1.0/0.0.0.0,dst=169.254.1.1/0.0.0.0,proto=17/0xff,tos=0/0,ttl=255/0,frag=no/0xff),udp(src=49152/0,dst=3784/0xffff)' -generate], [0], [stdout])
# check that the packet should be handled as BFD packet.
AT_CHECK([tail -2 stdout], [0], [dnl
This flow is handled by the userspace slow path because it:
	- Consists of BFD packets.
], [])

OVS_VSWITCHD_STOP
AT_CLEANUP

# Tests below are for bfd decay features.
AT_SETUP([bfd - bfd decay])
OVS_VSWITCHD_START([add-br br1 -- set bridge br1 datapath-type=dummy -- \
                    add-port br1 p1 -- set Interface p1 type=patch \
                    options:peer=p0 ofport_request=2 -- \
                    add-port br0 p0 -- set Interface p0 type=patch \
                    options:peer=p1 ofport_request=1 -- \
                    set Interface p0 bfd:enable=true bfd:min_tx=300 bfd:min_rx=300 -- \
                    set Interface p1 bfd:enable=true bfd:min_tx=500 bfd:min_rx=500])

ovs-appctl time/stop

# wait for a while to stablize everything.
for i in `seq 0 9`; do ovs-appctl time/warp 500; done
BFD_CHECK([p0], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
BFD_CHECK([p1], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
BFD_CHECK_RX([p0], [500ms], [300ms], [500ms])

# Test-1 BFD decay: decay to decay_min_rx
AT_CHECK([ovs-vsctl set interface p0 bfd:decay_min_rx=3000])
# set the bfd:decay_min_rx of p0 to 3000ms.
BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
BFD_CHECK_RX([p0], [500ms], [300ms], [500ms])

# bfd:decay_min_rx is set to 3000ms after the local state of p0 goes up,
# so for the first 2500ms, there should be no change.
for i in `seq 0 4`; do ovs-appctl time/warp 500; done
BFD_CHECK([p0], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
BFD_CHECK_RX([p0], [500ms], [300ms], [500ms])

# advance the clock by 2000ms.
for i in `seq 0 3`; do ovs-appctl time/warp 500; done
# now, min_rx should decay to 3000ms.
BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
BFD_CHECK_RX([p0], [3000ms], [3000ms], [500ms])

# the rx_min of p0 is 3000ms now, and p1 will send next control message
# 3000ms after decay. so, advance clock by 5000ms to make that happen.
for i in `seq 0 9`; do ovs-appctl time/warp 500; done
BFD_CHECK([p0], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
BFD_CHECK([p1], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
BFD_CHECK_RX([p0], [3000ms], [3000ms], [500ms])
# End of Test-1 ###############################################################


# Test-2 BFD decay: go back to cfg_min_rx when there is traffic
# receive packet at 1/100ms rate for 5000ms.
for i in `seq 0 49`
do
    ovs-appctl time/warp 100
    AT_CHECK([ovs-ofctl packet-out br1 3 2  "90e2ba01475000101856b2e80806000108000604000100101856b2e80202020300000000000002020202"],
             [0], [stdout], [])
done
# after a decay interval (3000ms), the p0 min_rx will go back to
# cfg_min_rx.
BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
BFD_CHECK_RX([p0], [500ms], [300ms], [500ms])
# End of Test-2 ###############################################################


# Test-3 BFD decay: go back to cfg_min_rx when decay_min_rx is changed
# advance the clock by 5000m. p0 shoud decay.
for i in `seq 0 9`; do ovs-appctl time/warp 500; done
BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
BFD_CHECK_RX([p0], [3000ms], [3000ms], [500ms])

# advance the clock, to make 'flag' go back to none.
for i in `seq 0 5`; do ovs-appctl time/warp 500; done
BFD_CHECK([p0], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
BFD_CHECK([p1], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])

# change decay_min_rx to 1000ms.
# for decay_min_rx < 2000ms, the decay detection time is set to 2000ms.
# this should reset the min_rx.
AT_CHECK([ovs-vsctl set Interface p0 bfd:decay_min_rx=1000])
BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
BFD_CHECK_RX([p0], [500ms], [300ms], [500ms])

# for the following 1500ms, there should be no decay,
# since the decay_detect_time is set to 2000ms.
for i in `seq 0 2`
do
    ovs-appctl time/warp 500
    BFD_CHECK([p0], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
    BFD_CHECK([p1], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
    BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
    BFD_CHECK_RX([p0], [500ms], [300ms], [500ms])
done

# advance the clock by 2000ms, decay should have happened.
for i in `seq 0 3`; do ovs-appctl time/warp 500; done
BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
BFD_CHECK_RX([p0], [1000ms], [1000ms], [500ms])
# advance the clock, so 'flag' go back to none.
for i in `seq 0 9`; do ovs-appctl time/warp 500; done
# End of Test-3 ###############################################################


# Test-4 BFD decay: set min_rx to 800ms.
# this should firstly reset the min_rx and then re-decay to 1000ms.
AT_CHECK([ovs-vsctl set Interface p0 bfd:min_rx=800])
BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
BFD_CHECK_RX([p0], [800ms], [800ms], [500ms])

# for the following 1600ms, there should be no decay,
# since the decay detection time is set to 2000ms.
for i in `seq 0 1`
do
    ovs-appctl time/warp 800
    BFD_CHECK([p0], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
    BFD_CHECK([p1], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
    BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
    BFD_CHECK_RX([p0], [800ms], [800ms], [500ms])
done

# advance the clock by 2000ms, decay should have happened.
for i in `seq 0 3`; do ovs-appctl time/warp 500; done
BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
BFD_CHECK_RX([p0], [1000ms], [1000ms], [500ms])
# advance the clock, so 'flag' go back to none.
for i in `seq 0 9`; do ovs-appctl time/warp 500; done
# End of Test-4 ###############################################################


# Test-5 BFD decay: set min_rx to 300ms and decay_min_rx to 5000ms together.
AT_CHECK([ovs-vsctl set Interface p0 bfd:min_rx=300 bfd:decay_min_rx=5000])
BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
BFD_CHECK_RX([p0], [500ms], [300ms], [500ms])

# for decay_min_rx > 2000ms, the decay detection time is set to
# decay_min_rx (5000ms).
# for the following 4500ms, there should be no decay,
# since the decay detection time is set to 5000ms.
for i in `seq 0 8`
do
    ovs-appctl time/warp 500
    BFD_CHECK([p0], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
    BFD_CHECK([p1], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
    BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
    BFD_CHECK_RX([p0], [500ms], [300ms], [500ms])
done

# advance the clock by 2000ms, decay should have happened.
for i in `seq 0 3`; do ovs-appctl time/warp 500; done
BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
BFD_CHECK_RX([p0], [5000ms], [5000ms], [500ms])
# advance the clock, to make 'flag' go back to none.
for i in `seq 0 9`; do ovs-appctl time/warp 500; done
# End of Test-5 ###############################################################


# Test-6 BFD decay: set decay_min_rx to 0 to disable bfd decay.
AT_CHECK([ovs-vsctl set Interface p0 bfd:decay_min_rx=0])
# min_rx is reset.
BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
BFD_CHECK_RX([p0], [500ms], [300ms], [500ms])
for i in `seq 0 20`
do
    ovs-appctl time/warp 500
    BFD_CHECK([p0], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
    BFD_CHECK([p1], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
    BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
    BFD_CHECK_RX([p0], [500ms], [300ms], [500ms])
done
# End of Test-6 ################################################################


# Test-7 BFD decay: rmt_min_tx is greater than decay_min_rx
AT_CHECK([ovs-vsctl set Interface p0 bfd:decay_min_rx=3000 -- set interface p1 bfd:min_tx=5000])
# there will be poll sequences from both sides. and it is hard to determine the
# order. so just skip 10000ms and check the RX/TX. at that time, p0 should be in decay already.
for i in `seq 0 19`; do ovs-appctl time/warp 500; done
BFD_CHECK_TX([p0], [500ms], [300ms], [5000ms])
BFD_CHECK_RX([p0], [5000ms], [3000ms], [500ms])
# then, there should be no change of status,
for i in `seq 0 9`
do
    ovs-appctl time/warp 500
    BFD_CHECK([p0], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
    BFD_CHECK([p1], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
    BFD_CHECK_TX([p0], [500ms], [300ms], [5000ms])
    BFD_CHECK_RX([p0], [5000ms], [3000ms], [500ms])
done
# reset the p1's min_tx to 500ms.
AT_CHECK([ovs-vsctl set Interface p1 bfd:min_tx=500])
# since p0 has been in decay, now the RX will show 3000ms.
BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
BFD_CHECK_RX([p0], [3000ms], [3000ms], [500ms])
# End of Test-7 ###############################################################


# Test-8 BFD decay: state up->down->up.
# turn bfd off on p1
AT_CHECK([ovs-vsctl set Interface p1 bfd:enable=false])

# check the state change of bfd on p0. After 15000 ms (> 3 min_rx intervals)
for i in `seq 0 14`; do ovs-appctl time/warp 1000; done
BFD_CHECK([p0], [false], [false], [none], [down], [Control Detection Time Expired], [none], [down], [No Diagnostic])
BFD_CHECK_TX([p0], [1000ms], [1000ms], [0ms])
BFD_CHECK_RX([p0], [300ms], [300ms], [1ms])

# resume the bfd on p1. the bfd should not go to decay mode direclty.
AT_CHECK([ovs-vsctl set Interface p1 bfd:enable=true])
for i in `seq 0 3`; do ovs-appctl time/warp 500; done
BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
BFD_CHECK_RX([p0], [500ms], [300ms], [500ms])

# since the decay_min_rx is still 3000ms, so after 5000ms, p0 should have decayed.
for i in `seq 0 9`; do ovs-appctl time/warp 500; done
BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
BFD_CHECK_RX([p0], [3000ms], [3000ms], [500ms])
# End of Test-8 ################################################################

OVS_VSWITCHD_STOP
AT_CLEANUP

# Tests below are for bfd forwarding_if_rx feature.
# forwarding_if_rx Test1: bfd is enabled on one end of link.
AT_SETUP([bfd - bfd forwarding_if_rx 1])
OVS_VSWITCHD_START([add-br br1 -- set bridge br1 datapath-type=dummy -- \
                    add-port br1 p1 -- set Interface p1 type=patch \
                    options:peer=p0 ofport_request=2 -- \
                    add-port br0 p0 -- set Interface p0 type=patch \
                    options:peer=p1 ofport_request=1 -- \
                    set Interface p0 bfd:enable=true bfd:min_tx=500 bfd:min_rx=500 -- \
                    add-port br1 p2 -- set Interface p2 type=internal ofport_request=3])

ovs-appctl time/stop
# check the inital status.
BFD_CHECK([p0], [false], [false], [none], [down], [No Diagnostic], [none], [down], [No Diagnostic])
BFD_CHECK_TX([p0], [1000ms], [1000ms], [0ms])
BFD_CHECK_RX([p0], [500ms], [500ms], [1ms])

# enable forwarding_if_rx.
AT_CHECK([ovs-vsctl set Interface p0 bfd:forwarding_if_rx=true], [0])

# there should be no change of forwarding flag, since
# there is no traffic.
for i in `seq 0 3`
do
    ovs-appctl time/warp 500
    BFD_CHECK([p0], [false], [false], [none], [down], [No Diagnostic], [none], [down], [No Diagnostic])
done

# receive one packet.
AT_CHECK([ovs-ofctl packet-out br1 3 2  "90e2ba01475000101856b2e80806000108000604000100101856b2e80202020300000000000002020202"],
             [0], [stdout], [])
# wait for 1000ms
for i in `seq 0 14`; do ovs-appctl time/warp 100; done
# the forwarding flag should turn to true sometime in this 1000ms, since there is data received.
BFD_CHECK([p0], [true], [false], [none], [down], [No Diagnostic], [none], [down], [No Diagnostic])
BFD_CHECK_TX([p0], [1000ms], [1000ms], [0ms])
BFD_CHECK_RX([p0], [500ms], [500ms], [1ms])

# Stop sending packets for 2000ms.
for i in `seq 0 19`; do ovs-appctl time/warp 100; done
BFD_CHECK([p0], [false], [false], [none], [down], [No Diagnostic], [none], [down], [No Diagnostic])
BFD_CHECK_TX([p0], [1000ms], [1000ms], [0ms])
BFD_CHECK_RX([p0], [500ms], [500ms], [1ms])

# receive packet at 1/100ms rate for 2000ms.
for i in `seq 0 19`
do
    ovs-appctl time/warp 100
    AT_CHECK([ovs-ofctl packet-out br1 3 2  "90e2ba01475000101856b2e80806000108000604000100101856b2e80202020300000000000002020202"],
             [0], [stdout], [])
done
# the forwarding flag should be true, since there is data received.
BFD_CHECK([p0], [true], [false], [none], [down], [No Diagnostic], [none], [down], [No Diagnostic])
BFD_CHECK_TX([p0], [1000ms], [1000ms], [0ms])
BFD_CHECK_RX([p0], [500ms], [500ms], [1ms])

# reset bfd forwarding_if_rx.
AT_CHECK([ovs-vsctl set Interface p0 bfd:forwarding_if_rx=false], [0])
# forwarding flag should turn to false since the STATE is DOWN.
BFD_CHECK([p0], [false], [false], [none], [down], [No Diagnostic], [none], [down], [No Diagnostic])
BFD_CHECK_TX([p0], [1000ms], [1000ms], [0ms])
BFD_CHECK_RX([p0], [500ms], [500ms], [1ms])

AT_CHECK([ovs-vsctl del-br br1], [0], [ignore])
AT_CLEANUP

# forwarding_if_rx Test2: bfd is enabled on both ends of link.
AT_SETUP([bfd - bfd forwarding_if_rx 2])
OVS_VSWITCHD_START([add-br br1 -- set bridge br1 datapath-type=dummy -- \
                    add-port br1 p1 -- set Interface p1 type=patch \
                    options:peer=p0 ofport_request=2 -- \
                    add-port br0 p0 -- set Interface p0 type=patch \
                    options:peer=p1 ofport_request=1 -- \
                    set Interface p0 bfd:enable=true bfd:min_tx=500 bfd:min_rx=500 -- \
                    set Interface p1 bfd:enable=true bfd:min_tx=300 bfd:min_rx=300 -- \
                    add-port br1 p2 -- set Interface p2 type=internal ofport_request=3])

ovs-appctl time/stop
# advance the clock, to stablize the states.
for i in `seq 0 9`; do ovs-appctl time/warp 500; done

# enable forwarding_if_rx.
AT_CHECK([ovs-vsctl set Interface p0 bfd:forwarding_if_rx=true], [0])

# there should be no change of the forwarding flag, since
# the bfd on both ends is already up.
for i in `seq 0 5`
do
    ovs-appctl time/warp 500
    BFD_CHECK([p0], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
done

# stop the bfd on one side.
AT_CHECK([ovs-vsctl set Interface p1 bfd:enable=false], [0])
# for within 1500ms, the detection timer is not out.
# there is no change to status.
for i in `seq 0 1`
do
    ovs-appctl time/warp 500
    BFD_CHECK([p0], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
    for i in `seq 0 4`
    do
        AT_CHECK([ovs-ofctl packet-out br1 3 2  "90e2ba01475000101856b2e80806000108000604000100101856b2e80202020300000000000002020202"],
                 [0], [stdout], [])
    done
done

# at 1500ms, the STATE should go DOWN, due to Control Detection Time Expired.
# but forwarding flag should be still true.
ovs-appctl time/warp 500
BFD_CHECK([p0], [true], [false], [none], [down], [Control Detection Time Expired], [none], [down], [No Diagnostic])

# receive packet at 1/100ms rate for 1000ms.
for i in `seq 0 9`
do
    AT_CHECK([ovs-ofctl packet-out br1 3 2  "90e2ba01475000101856b2e80806000108000604000100101856b2e80202020300000000000002020202"],
             [0], [stdout], [])
    ovs-appctl time/warp 100
    # the forwarding flag should always be true during this time.
    BFD_CHECK([p0], [true], [false], [none], [down], [Control Detection Time Expired], [none], [down], [No Diagnostic])
done

# reset bfd forwarding_if_rx.
AT_CHECK([ovs-vsctl set Interface p0 bfd:forwarding_if_rx=false], [0])
# forwarding flag should turn to false since the STATE is DOWN.
BFD_CHECK([p0], [false], [false], [none], [down], [Control Detection Time Expired], [none], [down], [No Diagnostic])
BFD_CHECK_TX([p0], [1000ms], [1000ms], [0ms])
BFD_CHECK_RX([p0], [500ms], [500ms], [1ms])

# re-enable bfd on the other end. the states should be up.
AT_CHECK([ovs-vsctl set Interface p1 bfd:enable=true bfd:min_tx=300 bfd:min_rx=300])
# advance the clock, to stablize the states.
for i in `seq 0 9`; do ovs-appctl time/warp 500; done
BFD_CHECK([p0], [true], [false], [none], [up], [Control Detection Time Expired], [none], [up], [No Diagnostic])
BFD_CHECK([p1], [true], [false], [none], [up], [No Diagnostic], [none], [up], [Control Detection Time Expired])
BFD_CHECK_TX([p0], [500ms], [500ms], [300ms])
BFD_CHECK_RX([p0], [500ms], [500ms], [300ms])

AT_CHECK([ovs-vsctl del-br br1], [0], [ignore])
AT_CLEANUP

# forwarding_if_rx Test3: bfd is enabled on both ends of link and decay is enabled.
AT_SETUP([bfd - bfd forwarding_if_rx 3])
OVS_VSWITCHD_START([add-br br1 -- set bridge br1 datapath-type=dummy -- \
                    add-port br1 p1 -- set Interface p1 type=patch \
                    options:peer=p0 ofport_request=2 -- \
                    add-port br0 p0 -- set Interface p0 type=patch \
                    options:peer=p1 ofport_request=1 -- \
                    set Interface p0 bfd:enable=true bfd:min_tx=300 bfd:min_rx=300 bfd:decay_min_rx=3000 -- \
                    set Interface p1 bfd:enable=true bfd:min_tx=500 bfd:min_rx=500])

ovs-appctl time/stop
# advance the clock, to stablize the states.
for i in `seq 0 19`; do ovs-appctl time/warp 500; done
BFD_CHECK([p0], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
BFD_CHECK([p1], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
BFD_CHECK_RX([p0], [3000ms], [3000ms], [500ms])

# enable forwarding_if_rx.
AT_CHECK([ovs-vsctl set Interface p0 bfd:forwarding_if_rx=true], [0])

# there should be no change of the forwarding flag, since
# the bfd on both ends is already up.
for i in `seq 0 9`
do
    ovs-appctl time/warp 500
    BFD_CHECK([p0], [true], [false], [none], [up], [No Diagnostic], [none], [up], [No Diagnostic])
done

# reconfigure the decay_min_rx to 1000ms.
AT_CHECK([ovs-vsctl set interface p0 bfd:decay_min_rx=1000])
BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
BFD_CHECK_RX([p0], [500ms], [300ms], [500ms])

# wait for 5000ms to decay.
for i in `seq 0 9`; do ovs-appctl time/warp 500; done
BFD_CHECK_TX([p0], [500ms], [300ms], [500ms])
BFD_CHECK_RX([p0], [1000ms], [1000ms], [500ms])

# stop the bfd on one side.
AT_CHECK([ovs-vsctl set Interface p1 bfd:enable=false], [0])

# advance clock by 4000ms, while receiving packets.
# the STATE should go DOWN, due to Control Detection Time Expired.
# but forwarding flag should be still true.
for i in `seq 0 7`
do
    ovs-appctl time/warp 500
    AT_CHECK([ovs-ofctl packet-out br1 3 2  "90e2ba01475000101856b2e80806000108000604000100101856b2e80202020300000000000002020202"],
             [0], [stdout], [])
done
BFD_CHECK([p0], [true], [false], [none], [down], [Control Detection Time Expired], [none], [down], [No Diagnostic])

# receive packet at 1/100ms rate for 1000ms.
for i in `seq 0 9`
do
    AT_CHECK([ovs-ofctl packet-out br1 3 2  "90e2ba01475000101856b2e80806000108000604000100101856b2e80202020300000000000002020202"],
             [0], [stdout], [])
    ovs-appctl time/warp 100
    # the forwarding flag should always be true during this time.
    BFD_CHECK([p0], [true], [false], [none], [down], [Control Detection Time Expired], [none], [down], [No Diagnostic])
done

# stop receiving for 3000ms.
for i in `seq 0 29`; do ovs-appctl time/warp 100; done
BFD_CHECK([p0], [false], [false], [none], [down], [Control Detection Time Expired], [none], [down], [No Diagnostic])

# reset bfd forwarding_if_rx.
AT_CHECK([ovs-vsctl set Interface p0 bfd:forwarding_if_rx=false])
# forwarding flag should turn to false since the STATE is DOWN.
BFD_CHECK([p0], [false], [false], [none], [down], [Control Detection Time Expired], [none], [down], [No Diagnostic])
BFD_CHECK_TX([p0], [1000ms], [1000ms], [0ms])
BFD_CHECK_RX([p0], [300ms], [300ms], [1ms])

# re-enable bfd forwarding_if_rx.
AT_CHECK([ovs-vsctl set Interface p0 bfd:forwarding_if_rx=true])
# there should be no change.
BFD_CHECK([p0], [false], [false], [none], [down], [Control Detection Time Expired], [none], [down], [No Diagnostic])
BFD_CHECK_TX([p0], [1000ms], [1000ms], [0ms])
BFD_CHECK_RX([p0], [300ms], [300ms], [1ms])

# re-enable bfd on the other end. the states should be up.
AT_CHECK([ovs-vsctl set Interface p1 bfd:enable=true bfd:min_tx=300 bfd:min_rx=300])
# advance the clock, to stablize the states.
for i in `seq 0 19`; do ovs-appctl time/warp 500; done
BFD_CHECK([p0], [true], [false], [none], [up], [Control Detection Time Expired], [none], [up], [No Diagnostic])
BFD_CHECK([p1], [true], [false], [none], [up], [No Diagnostic], [none], [up], [Control Detection Time Expired])
BFD_CHECK_TX([p0], [300ms], [300ms], [300ms])
BFD_CHECK_RX([p0], [1000ms], [1000ms], [300ms])

AT_CHECK([ovs-vsctl del-br br1], [0], [ignore])
AT_CLEANUP