linux-kernel - Re: [PATCH v2] AF_PACKET doesnt strip VLAN information

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Date:   Mon, 20 Jul 2020 16:36:58 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     stephen@...workplumber.org
Cc:     willemdebruijn.kernel@...il.com, srirakr2@...co.com,
        akpm@...ux-foundation.org, xe-linux-external@...co.com,
        kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, sthemmin@...rosoft.com,
        mbumgard@...co.com
Subject: Re: [PATCH v2] AF_PACKET doesnt strip VLAN information

From: Stephen Hemminger <stephen@...workplumber.org>
Date: Mon, 20 Jul 2020 13:56:50 -0700

> It matters because the problem is generic, not just to the netvsc driver.
> For example, BPF programs and netfilter rules will see different packets
> when send is through AF_PACKET than they would see for sends from the
> kernel stack.
> 
> Presenting uniform data to the lower layers makes sense.

The issue here is that for hyperv, vlan offloading is not a "may" but
a "must" and I've never understood it to have that meaning.

And I still haven't heard what is going to happen in Q-in-Q situations
even with the ugly hyperv driver hack that is currently under review.