netdev - Re: [PATCH net 5/6] virtio-net: fix the vq coalescing setting for vq resize

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Message-ID: <CACGkMEuJjxAmr6WC9ETYAw2K9dp0AUoD6LSZCduQyUQ9y7oM3Q@mail.gmail.com>
Date: Fri, 22 Sep 2023 12:29:47 +0800
From: Jason Wang <jasowang@...hat.com>
To: Heng Qi <hengqi@...ux.alibaba.com>
Cc: netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org, 
	"Michael S . Tsirkin" <mst@...hat.com>, "David S . Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, 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>, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
	Gavin Li <gavinl@...dia.com>
Subject: Re: [PATCH net 5/6] virtio-net: fix the vq coalescing setting for vq resize

On Tue, Sep 19, 2023 at 3:49 PM Heng Qi <hengqi@...ux.alibaba.com> wrote:
>
> According to the definition of virtqueue coalescing spec[1]:
>
>   Upon disabling and re-enabling a transmit virtqueue, the device MUST set
>   the coalescing parameters of the virtqueue to those configured through the
>   VIRTIO_NET_CTRL_NOTF_COAL_TX_SET command, or, if the driver did not set
>   any TX coalescing parameters, to 0.
>
>   Upon disabling and re-enabling a receive virtqueue, the device MUST set
>   the coalescing parameters of the virtqueue to those configured through the
>   VIRTIO_NET_CTRL_NOTF_COAL_RX_SET command, or, if the driver did not set
>   any RX coalescing parameters, to 0.
>
> We need to add this setting for vq resize (ethtool -G) where vq_reset happens.
>
> [1] https://lists.oasis-open.org/archives/virtio-dev/202303/msg00415.html
>
> Fixes: 394bd87764b6 ("virtio_net: support per queue interrupt coalesce command")

I'm not sure this is a real fix as spec allows it to go zero?

Thanks