Re: [PATCH 1/3] selftests: forwarding: vxlan_bridge_1d: fix test failure with br_netfilter enabled

On Tue, Feb 10, 2026 at 06:51:27PM +0000, Aleksei Oladko wrote:

The test generates VXLAN traffic using mausezahn, where the encapsulated
inner IPv4 packet contains a zero IP header checksum. After VXLAN
decapsulation, such packets do not pass sanity checks in br_netfilter
and are dropped, which causes the test to fail.

Fix this by calculating and setting a valid IPv4 header checksum for the
encapsulated packet generated by mausezahn, so that the packet is accepted
by br_netfilter.

Signed-off-by: Aleksei Oladko <redacted>

If you are targeting this as a fix, then:

1. Use "[PATCH net]" as subject prefix. See [1].

2. Add a Fixes tag.

3. Please mention in the commit message that this is fixed by using the
payload_template_calc_checksum() / payload_template_expand_checksum()
helpers that are only available in v6.3 and newer kernels.

Patch looks good otherwise (I also tested it).

[1] https://docs.kernel.org/process/maintainer-netdev.html