Hans Schultz
2023-Mar-26 15:41 UTC
[Bridge] [PATCH v2 net-next 6/6] selftests: forwarding: add dynamic FDB test
On Mon, Mar 20, 2023 at 10:44, Ido Schimmel <idosch at nvidia.com> wrote:>> + $MZ $swp1 -c 1 -p 128 -t udp "sp=54321,dp=12345" \ >> + -a $mac -b `mac_get $h2` -A 192.0.2.1 -B 192.0.2.2 -q >> + tc_check_packets "dev $swp2 egress" 1 1 >> + check_fail $? "Dynamic FDB entry did not age out" > > Shouldn't this be check_err()? After the FDB entry was aged you want to > make sure that packets received via $swp1 with SMAC being $mac are no > longer forwarded by the bridge.I was thinking that check_fail() will pass when tc_check_packets() does not see any packets, thus the test passing here when no packets are forwarded?> > Also, I suggest executing 'bridge fdb get' to make sure the entry is no > longer present in the bridge FDB. >
Ido Schimmel
2023-Mar-28 16:40 UTC
[Bridge] [PATCH v2 net-next 6/6] selftests: forwarding: add dynamic FDB test
On Sun, Mar 26, 2023 at 05:41:06PM +0200, Hans Schultz wrote:> On Mon, Mar 20, 2023 at 10:44, Ido Schimmel <idosch at nvidia.com> wrote: > >> + $MZ $swp1 -c 1 -p 128 -t udp "sp=54321,dp=12345" \ > >> + -a $mac -b `mac_get $h2` -A 192.0.2.1 -B 192.0.2.2 -q > >> + tc_check_packets "dev $swp2 egress" 1 1 > >> + check_fail $? "Dynamic FDB entry did not age out" > > > > Shouldn't this be check_err()? After the FDB entry was aged you want to > > make sure that packets received via $swp1 with SMAC being $mac are no > > longer forwarded by the bridge. > > I was thinking that check_fail() will pass when tc_check_packets() does > not see any packets, thus the test passing here when no packets are forwarded?What do you mean by "I was *thinking*"? How is it possible that you are submitting a selftest that you didn't bother running?! I see you trimmed my earlier question: "Does this actually work?" I tried it and it passed: # ./bridge_locked_port.sh TEST: Locked port ipv4 [ OK ] TEST: Locked port ipv6 [ OK ] TEST: Locked port vlan [ OK ] TEST: Locked port MAB [ OK ] TEST: Locked port MAB roam [ OK ] TEST: Locked port MAB configuration [ OK ] TEST: Locked port MAB FDB flush [ OK ] And I couldn't understand how that's even possible. Then I realized that the entire test is dead code because the patch is missing this fundamental hunk: ``` diff --git a/tools/testing/selftests/net/forwarding/bridge_locked_port.sh b/tools/testing/selftests/net/forwarding/bridge_locked_port.sh index dbc7017fd45d..5bf6b2aa1098 100755 --- a/tools/testing/selftests/net/forwarding/bridge_locked_port.sh +++ b/tools/testing/selftests/net/forwarding/bridge_locked_port.sh @@ -9,6 +9,7 @@ ALL_TESTS=" locked_port_mab_roam locked_port_mab_config locked_port_mab_flush + locked_port_dyn_fdb " NUM_NETIFS=4 ``` Which tells me that you didn't even try running it once. Now the test failed as I expected: # ./bridge_locked_port.sh TEST: Locked port ipv4 [ OK ] TEST: Locked port ipv6 [ OK ] TEST: Locked port vlan [ OK ] TEST: Locked port MAB [ OK ] TEST: Locked port MAB roam [ OK ] TEST: Locked port MAB configuration [ OK ] TEST: Locked port MAB FDB flush [ OK ] TEST: Locked port dyn FDB [FAIL] Packet not seen on egress after adding dynamic FDB Fixed by: ``` @@ -336,7 +337,7 @@ locked_port_dyn_fdb() tc filter add dev $swp2 egress protocol ip pref 1 handle 1 flower \ dst_ip 192.0.2.2 ip_proto udp dst_port 12345 action pass - $MZ $swp1 -c 1 -p 128 -t udp "sp=54321,dp=12345" \ + $MZ $h1 -c 1 -p 128 -t udp "sp=54321,dp=12345" \ -a $mac -b `mac_get $h2` -A 192.0.2.1 -B 192.0.2.2 -q tc_check_packets "dev $swp2 egress" 1 1 check_err $? "Packet not seen on egress after adding dynamic FDB" ``` Ran it again and it failed because of the second issue I pointed out: # ./bridge_locked_port.sh TEST: Locked port ipv4 [ OK ] TEST: Locked port ipv6 [ OK ] TEST: Locked port vlan [ OK ] TEST: Locked port MAB [ OK ] TEST: Locked port MAB roam [ OK ] TEST: Locked port MAB configuration [ OK ] TEST: Locked port MAB FDB flush [ OK ] TEST: Locked port dyn FDB [FAIL] Dynamic FDB entry did not age out Fixed by: ``` @@ -346,7 +347,7 @@ locked_port_dyn_fdb() $MZ $swp1 -c 1 -p 128 -t udp "sp=54321,dp=12345" \ -a $mac -b `mac_get $h2` -A 192.0.2.1 -B 192.0.2.2 -q tc_check_packets "dev $swp2 egress" 1 1 - check_fail $? "Dynamic FDB entry did not age out" + check_err $? "Dynamic FDB entry did not age out" ip link set dev br0 type bridge ageing_time $ageing_time bridge link set dev $swp1 learning off locked off ``` # ./bridge_locked_port.sh TEST: Locked port ipv4 [ OK ] TEST: Locked port ipv6 [ OK ] TEST: Locked port vlan [ OK ] TEST: Locked port MAB [ OK ] TEST: Locked port MAB roam [ OK ] TEST: Locked port MAB configuration [ OK ] TEST: Locked port MAB FDB flush [ OK ] TEST: Locked port dyn FDB [ OK ] Sigh
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