netdev - Re: [bug?] "hw csum failure" warning triggered on veth interface

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Message-ID: <72bd4d1d-ea06-4bcc-a77d-a56b5772c282@gmail.com>
Date: Tue, 8 Apr 2025 10:31:01 +0800
From: Qiyu Yan <yanqiyu01@...il.com>
To: Willem de Bruijn <willemdebruijn.kernel@...il.com>, netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>
Subject: Re: [bug?] "hw csum failure" warning triggered on veth interface

在 2025/4/7 22:59, Willem de Bruijn 写道:
> Can this be a packet coming in over the physical NIC, forwarded
> through veth to the container. Either using ip_forward or some
> redirect.
>
> Do packets arrive encapsulated in a tunnel and what does the
> decapsulation?

Yes, they are, by looking at the skb address information and compare the 
address to the route table, those are traffics from/to a CX4 NIC.

[Internet] <--> [CX4] <-- DNAT to Container/ SNAT from container --> 
[podman0] <---> [veth in netns]

I did not enable any special encapsulation on the internet/CX4 side.