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Re: [PATCH v5 1/1] virtio-net: Add check for mac address while peer is v
From: |
Michael S. Tsirkin |
Subject: |
Re: [PATCH v5 1/1] virtio-net: Add check for mac address while peer is vdpa |
Date: |
Thu, 25 Feb 2021 14:14:36 -0500 |
On Fri, Feb 26, 2021 at 12:55:06AM +0800, Cindy Lu wrote:
> While peer is vdpa, sometime qemu get an all zero mac address from the
> hardware,
> This is not a legal value. Add the check for this.if we get an zero mac
> address.
> qemu will use the default mac address or the mac address from qemu cmdline
>
> Signed-off-by: Cindy Lu <lulu@redhat.com>
I guess I will have to rewrite the comments and commit log :(
It is all saying what does the patch do. We want it to rather
give motivation.
Sean could you please comment on whether this patch fixes your
config?
> ---
> hw/net/virtio-net.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> index 9179013ac4..8f36ca5066 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));
> @@ -151,6 +152,15 @@ 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) {
> + /*
> + * Here is a work around, the 0 mac address is not a legal value.
> + * if we got this from hardware, qemu will use the mac address
> + * saved in VirtIONet->mac.
> + */
> + if (memcmp(&netcfg.mac, &zero, sizeof(zero)) == 0) {
> + info_report("Get an all zero mac address from hardware");
> + memcpy(netcfg.mac, n->mac, ETH_ALEN);
> + }
> memcpy(config, &netcfg, n->config_size);
> }
> }
> --
> 2.21.3