[PATCH v3 4/4] virtio_net: Add the 3rd acceptable situation for Mac setup.

[Cindy Lu]

While the hardware MAC address is 0 and the MAC address in
the QEMU command line is also 0, this configuration is
acceptable.

Signed-off-by: Cindy Lu <l...@redhat.com>
---
 hw/net/virtio-net.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 6900e3c44b..1e6a31baf8 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -3622,6 +3622,19 @@ static bool virtio_net_check_vdpa_mac(NetClientState 
*nc, VirtIONet *n,
             return true;
         }
     }
+    /*
+     * 3.The hardware MAC address is 0,
+     *  and the MAC address in the QEMU command line is also 0.
+     *  In this situation, qemu will generate a random mac address
+     *  QEMU will try to use CVQ/set_config to set this address to
+     *  device
+     */
+    if ((memcmp(&hwcfg.mac, &zero, sizeof(MACAddr)) == 0) &&
+        (memcmp(cmdline_mac, &zero, sizeof(MACAddr)) == 0)) {
+        memcpy(&n->mac[0], &n->nic_conf.macaddr, sizeof(n->mac));
+
+        return true;
+    }
 
     error_setg(errp,
                "vDPA device's mac %02x:%02x:%02x:%02x:%02x:%02x"
-- 
2.45.0