Re: [PATCH v2] virtio-net: Add check for mac address while peer is vdpa

[Jason Wang]

On 2020/10/23 下午5:15, Cindy Lu wrote:
> Sometime vdpa get an all 0 mac address from the hardware, this will cause the 
> traffic down
> So we add the check for this part.
> if we get an 0 mac address we will use the default mac address instead
>
> Signed-off-by: Cindy Lu <lulu@redhat.com>
> ---
>   hw/net/virtio-net.c | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> index 9179013ac4..f1648fc47d 100644
> --- a/hw/net/virtio-net.c
> +++ b/hw/net/virtio-net.c
> @@ -126,6 +126,7 @@ static void virtio_net_get_config(VirtIODevice *vdev, 
> uint8_t *config)
>       VirtIONet *n = VIRTIO_NET(vdev);
>       struct virtio_net_config netcfg;
>       NetClientState *nc = qemu_get_queue(n->nic);
> +    static const MACAddr zero = { .a = { 0, 0, 0, 0, 0, 0 } };
>   
>       int ret = 0;
>       memset(&netcfg, 0 , sizeof(struct virtio_net_config));
> @@ -151,7 +152,11 @@ static void virtio_net_get_config(VirtIODevice *vdev, 
> uint8_t *config)
>           ret = vhost_net_get_config(get_vhost_net(nc->peer), (uint8_t 
> *)&netcfg,
>                                      n->config_size);
>           if (ret != -1) {
> -            memcpy(config, &netcfg, n->config_size);
> +            if (memcmp(&netcfg.mac, &zero, sizeof(zero)) != 0) {
> +                memcpy(config, &netcfg, n->config_size);
> +        } else {
> +                error_report("Get an all zero mac address from hardware");
> +            }
>           }
>       }
>   }


Applied.

Thanks