netdev - Re: [PATCH net-next v3] virtio-net: ethtool configurable RXCSUM

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Date:   Mon, 12 Oct 2020 09:33:57 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Tonghao Zhang <xiangxia.m.yue@...il.com>
Cc:     Jason Wang <jasowang@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        virtualization@...ts.linux-foundation.org,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v3] virtio-net: ethtool configurable RXCSUM

On Sun, Oct 11, 2020 at 10:03 PM <xiangxia.m.yue@...il.com> wrote:
>
> From: Tonghao Zhang <xiangxia.m.yue@...il.com>
>
> Allow user configuring RXCSUM separately with ethtool -K,
> reusing the existing virtnet_set_guest_offloads helper
> that configures RXCSUM for XDP. This is conditional on
> VIRTIO_NET_F_CTRL_GUEST_OFFLOADS.
>
> If Rx checksum is disabled, LRO should also be disabled.
>
> Cc: Michael S. Tsirkin <mst@...hat.com>
> Cc: Jason Wang <jasowang@...hat.com>
> Cc: Willem de Bruijn <willemb@...gle.com>
> Signed-off-by: Tonghao Zhang <xiangxia.m.yue@...il.com>
> Acked-by: Michael S. Tsirkin <mst@...hat.com>

Acked-by: Willem de Bruijn <willemb@...gle.com>

I had to recall why we cannot just rely on dev->features and
dev->hw_features to encode the set of feature capabilities, but need
guest_offloads_capable.

Flag NETIF_F_LRO encapsulates multiple VIRTIO_NET_F_GUEST_.. flags,
and a device may advertise a subset. We thus have to bound to the set
learned at probing time.