netdev - Re: [net-next 14/15] net/mlx5: SRIOV, Add 802.1ad VST support

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Date:   Thu, 8 Dec 2022 18:04:42 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Saeed Mahameed <saeed@...nel.org>
Cc:     Saeed Mahameed <saeedm@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
        Tariq Toukan <tariqt@...dia.com>,
        Moshe Shemesh <moshe@...dia.com>,
        Mark Bloch <mbloch@...dia.com>
Subject: Re: [net-next 14/15] net/mlx5: SRIOV, Add 802.1ad VST support

On Thu, 8 Dec 2022 17:57:57 -0800 Saeed Mahameed wrote:
> So the whole thing started from finding these gaps in our out of tree 
> driver. there's the bug fix i will explain below, and the addition of .1ad
> both were found missing upstream when we convinced a customer to switch
> to upstream/inbox driver.
> 
> vst .1q and vst .1ad are both totally separate scenarios and use cases for
> the customers.
> 
> Currently upstream mlx5 only support VST for vlan proto .1q, 
> but it's buggy when traffic from the guest comes with a vlan tag, 
> depending on the HW/FW version, either the packets get dropped or
> the guest vlans get overridden with the VST host vlan, this is due to
> wrong interpretation of the hw steering rules in the initial driver
> implementation. in both cases it's a bug and the latter is even worse.

I see, but that's the fix? Uniformly drop?
Start stacking with just .1q? 
Auto-select the ethtype for .1ad if there's already a tag?