On Thursday 08 January 2009 04:36:02 Alex Williamson wrote:
> virtio_net: Enable setting MAC, promisc, and allmulti mode

Hi Alex,

   There's nothing wrong with this idea: I assume you have an actual usage
for this rather than it being an abstract improvement?

> @@ -41,7 +41,14 @@ struct virtnet_info
>       struct virtqueue *rvq, *svq;
>       struct net_device *dev;
>       struct napi_struct napi;
> -     unsigned int status;
> +     union {
> +             u16 raw;
> +             struct {
> +                     u16 link:1;
> +                     u16 promisc:1;
> +                     u16 allmulti:1;
> +             } bits;
> +     } status;

I don't think this works, as it depends on bitfield endian.

> @@ -30,7 +32,14 @@ struct virtio_net_config
>       __u8 mac[6];
>       /* Status supplied by host; see VIRTIO_NET_F_STATUS and VIRTIO_NET_S_*
>        * bits above */
> -     __u16 status;
> +     union {
> +             __u16 raw;
> +             struct {
> +                     __u16 link:1;
> +                     __u16 promisc:1;
> +                     __u16 allmulti:1;
> +             } bits;
> +       } status;
>  } __attribute__((packed));

As does this.  I think we need to leave the status bitfield as is.

Thanks,
Rusty.
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