[PATCH v7 1/4] vhost_vdpa : Add a new parameter to enable check mac address

[Cindy Lu]

When using a VDPA device, it's important to ensure that the MAC
address is correctly set.
This patch adds a new QEMU command line parameter to enable MAC
address verification,  which is enabled by default.

Usage example:
....
-netdev 
type=vhost-vdpa,vhostdev=/dev/vhost-vdpa-0,id=vhost-vdpa0,check-mac=true\
-device virtio-net-pci,netdev=vhost-vdpa0\
....
To disable this check:
....
-netdev 
type=vhost-vdpa,vhostdev=/dev/vhost-vdpa-0,id=vhost-vdpa0,check-mac=false\
-device virtio-net-pci,netdev=vhost-vdpa0\
....

Signed-off-by: Cindy Lu <l...@redhat.com>
---
 include/net/net.h | 1 +
 net/vhost-vdpa.c  | 5 +++++
 qapi/net.json     | 5 +++++
 3 files changed, 11 insertions(+)

diff --git a/include/net/net.h b/include/net/net.h
index cdd5b109b0..fac1951b6e 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -112,6 +112,7 @@ struct NetClientState {
     bool is_netdev;
     bool do_not_pad; /* do not pad to the minimum ethernet frame length */
     bool is_datapath;
+    bool check_mac;
     QTAILQ_HEAD(, NetFilterState) filters;
 };
 
diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
index 7ca8b46eee..7dbe6cf65c 100644
--- a/net/vhost-vdpa.c
+++ b/net/vhost-vdpa.c
@@ -1871,6 +1871,11 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char 
*name,
         if (!ncs[i])
             goto err;
     }
+    /* Enable the mac check by default */
+    if (opts->has_check_mac)
+        ncs[0]->check_mac = opts->check_mac;
+    else
+        ncs[0]->check_mac = true;
 
     if (has_cvq) {
         VhostVDPAState *s0 = DO_UPCAST(VhostVDPAState, nc, ncs[0]);
diff --git a/qapi/net.json b/qapi/net.json
index 310cc4fd19..0607c83833 100644
--- a/qapi/net.json
+++ b/qapi/net.json
@@ -510,6 +510,10 @@
 # @queues: number of queues to be created for multiqueue vhost-vdpa
 #     (default: 1)
 #
+# @check-mac: Enable the check for whether the device's MAC address
+#     and the MAC in QEMU command line are acceptable for booting.
+#     (default: true)
+#
 # @x-svq: Start device with (experimental) shadow virtqueue.  (Since
 #     7.1) (default: false)
 #
@@ -524,6 +528,7 @@
     '*vhostdev':     'str',
     '*vhostfd':      'str',
     '*queues':       'int',
+    '*check-mac':    'bool',
     '*x-svq':        {'type': 'bool', 'features' : [ 'unstable'] } } }
 
 ##
-- 
2.45.0