netdev - Re: [PATCH v11 24/40] virtio_pci: struct virtio_pci_common_cfg add queue_notify

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Date:   Fri, 1 Jul 2022 17:34:12 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        virtualization@...ts.linux-foundation.org
Cc:     Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        "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>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        Vadim Pasternak <vadimp@...dia.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Cornelia Huck <cohuck@...hat.com>,
        Halil Pasic <pasic@...ux.ibm.com>,
        Eric Farman <farman@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        linux-um@...ts.infradead.org, netdev@...r.kernel.org,
        platform-driver-x86@...r.kernel.org,
        linux-remoteproc@...r.kernel.org, linux-s390@...r.kernel.org,
        kvm@...r.kernel.org, bpf@...r.kernel.org,
        kangjie.xu@...ux.alibaba.com
Subject: Re: [PATCH v11 24/40] virtio_pci: struct virtio_pci_common_cfg add
 queue_notify_data


在 2022/6/29 14:56, Xuan Zhuo 写道:
> Add queue_notify_data in struct virtio_pci_common_cfg, which comes from
> here https://github.com/oasis-tcs/virtio-spec/issues/89
>
> Since I want to add queue_reset after queue_notify_data, I submitted
> this patch first.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> Acked-by: Jason Wang <jasowang@...hat.com>
> ---
>   include/linux/virtio_pci_modern.h | 2 ++
>   include/uapi/linux/virtio_pci.h   | 1 +
>   2 files changed, 3 insertions(+)
>
> diff --git a/include/linux/virtio_pci_modern.h b/include/linux/virtio_pci_modern.h
> index c4f7ffbacb4e..9f31dde46f57 100644
> --- a/include/linux/virtio_pci_modern.h
> +++ b/include/linux/virtio_pci_modern.h
> @@ -29,6 +29,8 @@ struct virtio_pci_common_cfg {
>   	__le32 queue_avail_hi;		/* read-write */
>   	__le32 queue_used_lo;		/* read-write */
>   	__le32 queue_used_hi;		/* read-write */
> +	__le16 queue_notify_data;	/* read-write */
> +	__le16 padding;
>   };


As previous patch, I think it's better to simple embed the uAPI 
structure here.

Thanks


>   
>   struct virtio_pci_modern_device {
> diff --git a/include/uapi/linux/virtio_pci.h b/include/uapi/linux/virtio_pci.h
> index 247ec42af2c8..748b3eb62d2f 100644
> --- a/include/uapi/linux/virtio_pci.h
> +++ b/include/uapi/linux/virtio_pci.h
> @@ -176,6 +176,7 @@ struct virtio_pci_cfg_cap {
>   #define VIRTIO_PCI_COMMON_Q_AVAILHI	44
>   #define VIRTIO_PCI_COMMON_Q_USEDLO	48
>   #define VIRTIO_PCI_COMMON_Q_USEDHI	52
> +#define VIRTIO_PCI_COMMON_Q_NDATA	56
>   
>   #endif /* VIRTIO_PCI_NO_MODERN */
>