Currently, the second bridge command overwrites the first one.
Fix this by adding this VID to the interface behind $swp2.

The one_bridge_two_pvids() test intends to check that there is no
leakage of traffic between bridge ports which have a single VLAN - the
PVID VLAN.

Because of a typo, port $swp1 is configured with a PVID twice (second
command overwrites first), and $swp2 isn't configured at all (and since
the bridge vlan_default_pvid property is set to 0, this port will not
have a PVID at all, so it will drop all untagged and priority-tagged
traffic).

So, instead of testing the configuration that was intended, we are
testing a different one, where one port has PVID 2 and the other has
no PVID. This incorrect version of the test should also pass, but is
ineffective for its purpose, so fix the typo.

This typo has an impact on results of the test results,
potentially leading to wrong conclusions regarding
the functionality of a network device.

Fixes: 476a4f05d9b8 ("selftests: forwarding: add a no_forwarding.sh test")
Reviewed-by: Hangbin Liu <liuhangbin@gmail.com>
Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Kacper Ludwinski <kac.ludwinski@icloud.com>
---
 tools/testing/selftests/net/forwarding/no_forwarding.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

v4:
	- Add revision history od this patch
	- Add "Reviewed-by:"
	- Limit number of characters in commit to 80
	- Add impact explanation to commit message
v3:
	- Edit commit message
	- Add missing Signed-off-by
	- Link: https://lore.kernel.org/linux-kselftest/20240927112824.339-1-kac.ludwinski@icloud.com/
v2:
	- Add missing CCs
	- Fix typo in commit message
	- Add target name
	- Link: https://lore.kernel.org/linux-kselftest/fQknN_r6POzmrp8UVjyA3cknLnB1HB9I_jfaHoQScvvgHr59VfUNRs9IDo4kQHm1uxEp8_Luym2Vi6_aUGJIec3ZPhjY2qnJ57NgLZGA3K4=@protonmail.com/
v1:
	- Link: https://lore.kernel.org/linux-kselftest/20240925050539.1906-1-kacper@ludwinski.dev/

diff --git a/tools/testing/selftests/net/forwarding/no_forwarding.sh b/tools/testing/selftests/net/forwarding/no_forwarding.sh
index 9e677aa64a06..694ece9ba3a7 100755
--- a/tools/testing/selftests/net/forwarding/no_forwarding.sh
+++ b/tools/testing/selftests/net/forwarding/no_forwarding.sh
@@ -202,7 +202,7 @@ one_bridge_two_pvids()
 	ip link set $swp2 master br0
 
 	bridge vlan add dev $swp1 vid 1 pvid untagged
-	bridge vlan add dev $swp1 vid 2 pvid untagged
+	bridge vlan add dev $swp2 vid 2 pvid untagged
 
 	run_test "Switch ports in VLAN-aware bridge with different PVIDs"
 
-- 
2.43.0

On Mon, Sep 30, 2024 at 03:35:43PM +0900, Kacper Ludwinski wrote:
> This typo has an impact on results of the test results,
> potentially leading to wrong conclusions regarding
> the functionality of a network device.

Did you test this? You are effectively introducing a new test.
Could you include the test result in the commit message, please?
Also, "results of the test results" doesn't sound too good.