ACK/Cmnt: [SRU][O:linux/N:linux/J:hwe-6.8][PATCH 0/1] Fix distributed gateway usecase for mlx5 hardware offload

[Stefan Bader]

On 03.12.24 19:23, Jacob Martin wrote:
> BugLink: https://bugs.launchpad.net/bugs/2085018
> 
> SRU Justification
> 
> [Impact]
> 
>  From Frode Nordahl on LP#2085018:
> 
> Consider a topology with two chassis, A and B:
> * A acts as a distributed gateway connected to provider network on tagged VLAN
>      and has GENEVE tunnel configured towards chassis B.
> * B hosts the target instance.
> * From a third machine connected to the provider network we can observe:
>     * Only first ICMP ECHO reply from target instance is forwarded.
>     * Attempt to establish TCP connection fails.
> 
> [Fix]
> 
> The patch "net/mlx5e: Remove workaround to avoid syndrome for internal port"
> from Jianbo Liu at NVIDIA resolves the issue.
> 
> The issue affects:
> - oracular:linux
> - noble:linux
> - jammy:linux-hwe-6.8 (as it is derived from noble:linux)
> 
> [Test Plan]
> 
> Patched kernel installed and the distributed gateway usecase is verified to
> work again while using mlx5 hardware offload.
> 
> [Where problems could occur]
> 
> This fix makes changes specific to the in-tree mlx5_core driver. Issues with
> this fix would result in misbehavior of that driver.
> 
> Jianbo Liu (1):
>    UBUNTU: SAUCE: net/mlx5e: Remove workaround to avoid syndrome for
>      internal port
> 
>   .../ethernet/mellanox/mlx5/core/en/tc_tun_encap.c   | 13 +++++++++++--
>   1 file changed, 11 insertions(+), 2 deletions(-)
> 

As a hotfix maybe to n:hwe-6.11 and j:hwe-6.8. Since those are not yet 
started for the sec cycle. Long term we should try to replace this with 
a non-SAUCE variant when it is upstream (assuming it goes there since 
the commit it refers to be fixing is non-SAUCE).

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