[PATCH v5 3/4] virtio_net: Add second acceptable configuration for MAC setup

[Cindy Lu <lulu@redhat.com>]

For VDPA devices, Allow configurations where the hardware MAC address
is non-zero while the MAC address in the QEMU command line is zero.

Signed-off-by: Cindy Lu <lulu@redhat.com>
---
 hw/net/virtio-net.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index a3b431e000..1fd0403d5d 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -3767,6 +3767,20 @@ 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, Here we use the hardware MAC address overwrite
+         *  the QEMU command line address(is 0) in VirtIONet->mac[0].
+         *  in the follwoing process, QEMU will use this mac in VirtIONet and
+         *  finish the bring up
+         */
+        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