[PATCH v2 2/3] virtio_net: Add the 2rd acceptable situation for Mac setup.

[Cindy Lu <lulu@redhat.com>]

When using a VDPA device, the following situations are
also acceptable: the hardware MAC address is not 0,
and the MAC address in the QEMU command line is 0.

Signed-off-by: Cindy Lu <lulu@redhat.com>
---
 hw/net/virtio-net.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 7aa7308244..5c610d8078 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -3607,6 +3607,18 @@ static bool virtio_net_check_vdpa_mac(NetClientState *nc, VirtIONet *n,
         if ((memcmp(&hwcfg.mac, cmdline_mac, sizeof(MACAddr)) == 0)) {
             return true;
         }
+        /*
+         * 2.The hardware MAC address is not 0,
+         *  and the MAC address in the QEMU command line is 0.
+         *  In this situation, the hardware MAC address will overwrite
+         *  the QEMU command line address.
+         */
+        if (memcmp(cmdline_mac, &zero, sizeof(MACAddr)) == 0) {
+            /* overwrite the mac address with hardware address*/
+            memcpy(&n->mac[0], &hwcfg.mac, sizeof(n->mac));
+            memcpy(&n->nic_conf.macaddr, &hwcfg.mac, sizeof(n->mac));
+            return true;
+        }
     }
 
     error_setg(errp,
-- 
2.45.0