netdev - Re: [PATCH 1/2] virtio_net: checksum offloading handling fix

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Date: Tue, 18 Jun 2024 18:15:16 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Heng Qi <hengqi@...ux.alibaba.com>
Cc: Jason Wang <jasowang@...hat.com>, netdev@...r.kernel.org,
 virtualization@...ts.linux.dev, Thomas Huth <thuth@...ux.vnet.ibm.com>,
 "Michael S. Tsirkin" <mst@...hat.com>, Xuan Zhuo
 <xuanzhuo@...ux.alibaba.com>, Eugenio Pérez
 <eperezma@...hat.com>, Eric Dumazet <edumazet@...gle.com>, "David S.
 Miller" <davem@...emloft.net>, Paolo Abeni <pabeni@...hat.com>, Alexei
 Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>,
 Jesper Dangaard Brouer <hawk@...nel.org>, John Fastabend
 <john.fastabend@...il.com>
Subject: Re: [PATCH 1/2] virtio_net: checksum offloading handling fix

On Tue, 18 Jun 2024 11:09:02 +0800 Heng Qi wrote:
> > (Should we manually do checksum if RXCUSM is disabled?)
> >   
> 
> Currently we do not allow RXCUSM to be disabled.

You don't have to disable checksuming in the device.
Just ignore VIRTIO_NET_HDR_F_DATA_VALID if user cleared NETIF_F_RXCSUM.
I know some paranoid workloads which do actually want the kernel to
calculate the checksum.