[PATCH 2/3] virtio_net: Add the check for vdpa mac address

[Cindy Lu]

When using a VDPA device, this is another acceptable situations
The hardware MAC address is not 0, and the MAC address in the QEMU command line 
is 0.
This is also acceptable

Signed-off-by: Cindy Lu <lulu@redhat.com>
---
 hw/net/virtio-net.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 7f51bd0dd3..c144ae2e78 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -3592,11 +3592,22 @@ static bool virtio_net_check_vdpa_mac(NetClientState 
*nc, VirtIONet *n, MACAddr
      * 1.The hardware MAC address is the same as the QEMU command line MAC
      *   address, and both of them are not 0.
      */
-
+       /*
+     * 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(&hwcfg.mac, &zero, sizeof(MACAddr)) != 0) {
                if ((memcmp(&hwcfg.mac, cmdline_mac, sizeof(MACAddr)) == 0)) {
                        return true;
                }
+               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, "vDPA device's mac != the mac address from qemu 
cmdline"
                         "Please check the the vdpa device's setting.");
-- 
2.45.0