[Bug 1891421] Re: kci_test_encap_fou() in rtnetlink.sh from kselftests/net failed with "FAIL: can't add fou port 7777, skipping test"

** Changed in: linux (Ubuntu Groovy)
Importance: Undecided => Medium

** Changed in: linux (Ubuntu Focal)
Importance: Undecided => Medium

** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1891421

Title:
kci_test_encap_fou() in rtnetlink.sh from kselftests/net failed with
"FAIL: can't add fou port 7777, skipping test"

Status in ubuntu-kernel-tests:
In Progress
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-5.6 package in Ubuntu:
Invalid
Status in linux-oem-osp1 package in Ubuntu:
Invalid
Status in linux source package in Bionic:
In Progress
Status in linux-oem-5.6 source package in Bionic:
Invalid
Status in linux-oem-osp1 source package in Bionic:
In Progress
Status in linux source package in Focal:
In Progress
Status in linux-oem-5.6 source package in Focal:
In Progress
Status in linux-oem-osp1 source package in Focal:
Invalid
Status in linux source package in Groovy:
In Progress
Status in linux-oem-5.6 source package in Groovy:
Invalid
Status in linux-oem-osp1 source package in Groovy:
Invalid

Bug description:
== SRU Justification ==
The kci_test_encap_fou() from kci_test_encap() in rtnetlink.sh of
kselftests/net will fail with non-zero return value, and print:
  "FAIL: can't add fou port 7777, skipping test"

How to reproduce this:
 devdummy="test-dummy0"
 testns="testns"
 ip netns add "$testns"
 ip netns exec "$testns" ip link set lo up
 ip netns exec "$testns" ip link add name "$devdummy" type dummy
 ip netns exec "$testns" ip link set "$devdummy" up
 ip netns exec "$testns" ip fou add port 7777 ipproto 47
RTNETLINK answers: No such file or directory
Error talking to the kernel

This test would require the fou module to be loaded before it gets
started.

== Fix
* 26ebd6fed9bb ("selftests: rtnetlink: load fou module for
kci_test_encap_fou() test")

This patch needs to be backported for series after Xenial.

== Test ==
Patch tested directly on the kernel tree, the test will now pass as
expected.

== Regression Potential ==
Low, change limited to the testing tool.

== Original Bug Report ==
The kci_test_encap_fou() from kci_test_encap() in rtnetlink.sh of kselftests/net will fail with non-zero return value, and print:
  "FAIL: can't add fou port 7777, skipping test"

How to reproduce this:
 devdummy="test-dummy0"
 testns="testns"
 ip netns add "$testns"
 ip netns exec "$testns" ip link set lo up
 ip netns exec "$testns" ip link add name "$devdummy" type dummy
 ip netns exec "$testns" ip link set "$devdummy" up
 ip netns exec "$testns" ip fou add port 7777 ipproto 47
RTNETLINK answers: No such file or directory
Error talking to the kernel

This is not a regression, it's the real test result after bug 1890136
has been fixed.

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