netdev - Re: [PATCH v3 01/17] virtio_pci: struct virtio_pci_common_cfg add queue_notify

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Date:   Mon, 7 Feb 2022 11:41:06 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>, bpf@...r.kernel.org
Subject: Re: [PATCH v3 01/17] virtio_pci: struct virtio_pci_common_cfg add
 queue_notify_data


在 2022/1/26 下午3:35, 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 it, I submitted this patch first.
>
> Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> ---
>   include/uapi/linux/virtio_pci.h | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/include/uapi/linux/virtio_pci.h b/include/uapi/linux/virtio_pci.h
> index 3a86f36d7e3d..492c89f56c6a 100644
> --- a/include/uapi/linux/virtio_pci.h
> +++ b/include/uapi/linux/virtio_pci.h
> @@ -164,6 +164,7 @@ 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 */
>   };


So I had the same concern as previous version.

This breaks uABI where program may try to use sizeof(struct 
virtio_pci_common_cfg).

We probably need a container structure here.

THanks


>   
>   /* Fields in VIRTIO_PCI_CAP_PCI_CFG: */