ACK: [SRU][N][PATCH 0/4] re-enable Ubuntu FAN in the Noble kernel

[Stefan Bader]

On 01.05.24 14:34, Andrea Righi wrote:
> BugLink: https://bugs.launchpad.net/bugs/2064508
> 
> [Impact]
> 
> In LP: #2063298, we have opted to deprecate Ubuntu FAN support because
> of the maintenance overhead and the possibility of regressions /
> conflicts with the new networking eBPF APIs in kernels >= 6.8.
> 
> However, we cannot disable this feature in HWE/backport kernels, so it
> seems safer to adjust the Ubuntu FAN kernel patch set to ensure proper
> co-existence with the updated vxlan policy requirements in newer 6.8
> kernels.
> 
> The re-introduction of Ubuntu FAN should be considered as a temporary
> measure, aimed at facilitating a smooth transition during its
> deprecation without disrupting existing users (specifically Juju), and
> enabling the backporting of 6.8 kernels to older releases.
> 
> The main plan is still to deprecate Ubuntu FAN in newer releases.
> 
> [Test case]
> 
> Rely on the specific Ubuntu FAN regression test to validate the proper
> kernel support of this feature:
> 
> https://git.launchpad.net/~canonical-kernel-team/+git/autotest-client-tests/tree/ubuntu_fan_smoke_test?h=autotest3
> 
> [Fix]
> 
> Re-apply the Ubuntu FAN patch set to the latest Noble kernel 6.8 and
> integrate the IFLA_VXLAN_FAN_MAP attribute type in vxlan_policy to
> satisfy the strict length validation check.
> 
> Test result (ubuntu_fan_smoke_test) with this patch set applied to the
> latest Noble kernel:
> 
>   11:48:05 INFO | Writing results to /home/ubuntu/autotest/client/results/default
>   11:48:05 INFO | START	----	----	timestamp=1714564085	localtime=May 01 11:48:05
>   11:48:05 INFO | 	START	ubuntu_fan_smoke_test.setup	ubuntu_fan_smoke_test.setup	timeout=1200	timestamp=1714564085	localtime=May 01 11:48:05
>   11:48:07 INFO | 		GOOD	ubuntu_fan_smoke_test.setup	ubuntu_fan_smoke_test.setup	timestamp=1714564087	localtime=May 01 11:48:07	completed successfully
>   11:48:07 INFO | 	END GOOD	ubuntu_fan_smoke_test.setup	ubuntu_fan_smoke_test.setup	timestamp=1714564087	localtime=May 01 11:48:07
>   11:48:07 INFO | 	START	ubuntu_fan_smoke_test.fan-smoke-test	ubuntu_fan_smoke_test.fan-smoke-test	timeout=1800	timestamp=1714564087	localtime=May 01 11:48:07
>   11:51:46 INFO | Testing Fan Networking (pre-0.13.0 API)
>   11:51:46 INFO | docker pull --platform linux/amd64 ubuntu: PASSED
>   11:51:46 INFO | enable disable fan test: PASSED
>   11:51:46 INFO | fanctl show test: PASSED
>   11:51:46 INFO | fanctl check bridge config test: PASSED
>   11:51:46 INFO | fanatic docker test(--dns=192.168.122.1): PASSED
>   11:51:47 INFO | 		GOOD	ubuntu_fan_smoke_test.fan-smoke-test	ubuntu_fan_smoke_test.fan-smoke-test	timestamp=1714564307	localtime=May 01 11:51:47	completed successfully
>   11:51:47 INFO | 	END GOOD	ubuntu_fan_smoke_test.fan-smoke-test	ubuntu_fan_smoke_test.fan-smoke-test	timestamp=1714564307	localtime=May 01 11:51:47
>   11:51:47 INFO | END GOOD	----	----	timestamp=1714564307	localtime=May 01 11:51:47
>   11:51:47 INFO | Report successfully generated at /home/ubuntu/autotest/client/results/default/job_report.html
> 
> [Regression potential]
> 
> We may experience regressions with eBPF vxlan capabilities and
> potentially specific use cases of the Ubuntu FAN technology (Juju
> installations).
> 
> ----------------------------------------------------------------
> Andrea Righi (1):
>        UBUNTU: SAUCE: fan: support vxlan strict length validation
> 
> Jay Vosburgh (2):
>        UBUNTU: SAUCE: fan: tunnel multiple mapping mode (v3)
>        UBUNTU: SAUCE: fan: add VXLAN implementation
> 
> Juerg Haefliger (1):
>        UBUNTU: SAUCE: fan: Fix NULL pointer dereference
> 
>   drivers/net/vxlan/vxlan_core.c | 264 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>   include/net/ip_tunnels.h       |  28 +++++++++++
>   include/net/vxlan.h            |   2 +
>   include/uapi/linux/if_link.h   |   1 +
>   include/uapi/linux/if_tunnel.h |  19 ++++++++
>   net/ipv4/ip_tunnel.c           |   2 +-
>   net/ipv4/ipip.c                | 311 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
>   7 files changed, 624 insertions(+), 3 deletions(-)
> 

Acked-by: Stefan Bader <stefan.bader at canonical.com>
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