netdev - Re: [PATCH v11 23/40] virtio_pci: move struct virtio_pci_common_cfg to virtio_pci

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Date:   Fri, 1 Jul 2022 17:33:00 +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 23/40] virtio_pci: move struct virtio_pci_common_cfg
 to virtio_pci_modern.h


在 2022/6/29 14:56, Xuan Zhuo 写道:
> In order to facilitate the expansion of virtio_pci_common_cfg in the
> future, move it from uapi to virtio_pci_modern.h. In this way, we can
> freely expand virtio_pci_common_cfg in the future.
>
> Other projects using virtio_pci_common_cfg in uapi need to maintain a
> separate virtio_pci_common_cfg or use the offset macro defined in uapi.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> ---
>   include/linux/virtio_pci_modern.h | 26 ++++++++++++++++++++++++++
>   include/uapi/linux/virtio_pci.h   | 26 --------------------------
>   2 files changed, 26 insertions(+), 26 deletions(-)
>
> diff --git a/include/linux/virtio_pci_modern.h b/include/linux/virtio_pci_modern.h
> index eb2bd9b4077d..c4f7ffbacb4e 100644
> --- a/include/linux/virtio_pci_modern.h
> +++ b/include/linux/virtio_pci_modern.h
> @@ -5,6 +5,32 @@
>   #include <linux/pci.h>
>   #include <linux/virtio_pci.h>
>   
> +/* Fields in VIRTIO_PCI_CAP_COMMON_CFG: */
> +struct virtio_pci_common_cfg {
> +	/* About the whole device. */
> +	__le32 device_feature_select;	/* read-write */
> +	__le32 device_feature;		/* read-only */
> +	__le32 guest_feature_select;	/* read-write */
> +	__le32 guest_feature;		/* read-write */
> +	__le16 msix_config;		/* read-write */
> +	__le16 num_queues;		/* read-only */
> +	__u8 device_status;		/* read-write */
> +	__u8 config_generation;		/* read-only */
> +
> +	/* About a specific virtqueue. */
> +	__le16 queue_select;		/* read-write */
> +	__le16 queue_size;		/* read-write, power of 2. */
> +	__le16 queue_msix_vector;	/* read-write */
> +	__le16 queue_enable;		/* read-write */
> +	__le16 queue_notify_off;	/* read-only */
> +	__le32 queue_desc_lo;		/* read-write */
> +	__le32 queue_desc_hi;		/* read-write */
> +	__le32 queue_avail_lo;		/* read-write */
> +	__le32 queue_avail_hi;		/* read-write */
> +	__le32 queue_used_lo;		/* read-write */
> +	__le32 queue_used_hi;		/* read-write */
> +};
> +
>   struct virtio_pci_modern_device {
>   	struct pci_dev *pci_dev;
>   
> diff --git a/include/uapi/linux/virtio_pci.h b/include/uapi/linux/virtio_pci.h
> index 3a86f36d7e3d..247ec42af2c8 100644
> --- a/include/uapi/linux/virtio_pci.h
> +++ b/include/uapi/linux/virtio_pci.h
> @@ -140,32 +140,6 @@ struct virtio_pci_notify_cap {
>   	__le32 notify_off_multiplier;	/* Multiplier for queue_notify_off. */
>   };
>   
> -/* Fields in VIRTIO_PCI_CAP_COMMON_CFG: */
> -struct virtio_pci_common_cfg {
> -	/* About the whole device. */
> -	__le32 device_feature_select;	/* read-write */
> -	__le32 device_feature;		/* read-only */
> -	__le32 guest_feature_select;	/* read-write */
> -	__le32 guest_feature;		/* read-write */
> -	__le16 msix_config;		/* read-write */
> -	__le16 num_queues;		/* read-only */
> -	__u8 device_status;		/* read-write */
> -	__u8 config_generation;		/* read-only */
> -
> -	/* About a specific virtqueue. */
> -	__le16 queue_select;		/* read-write */
> -	__le16 queue_size;		/* read-write, power of 2. */
> -	__le16 queue_msix_vector;	/* read-write */
> -	__le16 queue_enable;		/* read-write */
> -	__le16 queue_notify_off;	/* read-only */
> -	__le32 queue_desc_lo;		/* read-write */
> -	__le32 queue_desc_hi;		/* read-write */
> -	__le32 queue_avail_lo;		/* read-write */
> -	__le32 queue_avail_hi;		/* read-write */
> -	__le32 queue_used_lo;		/* read-write */
> -	__le32 queue_used_hi;		/* read-write */
> -};
> -


I think it's better not delete those from uAPI. We can embed this struct 
in the private virito_pci_moden.h anyhow.

Thanks


>   /* Fields in VIRTIO_PCI_CAP_PCI_CFG: */
>   struct virtio_pci_cfg_cap {
>   	struct virtio_pci_cap cap;