From 3f55d12df35552ae948587a62d6f9015664adc13 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= <eperezma@redhat.com>
Date: Wed, 21 Dec 2022 12:50:12 +0100
Subject: [PATCH 1/9] virtio_net: Modify virtio_net_get_config to early return
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RH-Author: Eugenio Pérez <eperezma@redhat.com>
RH-MergeRequest: 137: vDPA net SVQ guest announce support
RH-Bugzilla: 2141088
RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
RH-Acked-by: Cindy Lu <lulu@redhat.com>
RH-Acked-by: Jason Wang <jasowang@redhat.com>
RH-Commit: [1/4] 4f5e79afd54e157f32e6fff56ae33e2b71492525 (eperezmartin/qemu-kvm)

Next patches introduce more code on vhost-vdpa branch, with already have
too much indentation.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20221221115015.1400889-2-eperezma@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit ebc141a62508dc91901373c1a19fe7e2cf560dfb)
---
 hw/net/virtio-net.c | 28 +++++++++++++++-------------
 1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index ec974f7a76..5935e55653 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -168,20 +168,22 @@ static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
     if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
         ret = vhost_net_get_config(get_vhost_net(nc->peer), (uint8_t *)&netcfg,
                                    n->config_size);
-        if (ret != -1) {
-            /*
-             * Some NIC/kernel combinations present 0 as the mac address.  As
-             * that is not a legal address, try to proceed with the
-             * address from the QEMU command line in the hope that the
-             * address has been configured correctly elsewhere - just not
-             * reported by the device.
-             */
-            if (memcmp(&netcfg.mac, &zero, sizeof(zero)) == 0) {
-                info_report("Zero hardware mac address detected. Ignoring.");
-                memcpy(netcfg.mac, n->mac, ETH_ALEN);
-            }
-            memcpy(config, &netcfg, n->config_size);
+        if (ret == -1) {
+            return;
         }
+
+        /*
+         * Some NIC/kernel combinations present 0 as the mac address.  As that
+         * is not a legal address, try to proceed with the address from the
+         * QEMU command line in the hope that the address has been configured
+         * correctly elsewhere - just not reported by the device.
+         */
+        if (memcmp(&netcfg.mac, &zero, sizeof(zero)) == 0) {
+            info_report("Zero hardware mac address detected. Ignoring.");
+            memcpy(netcfg.mac, n->mac, ETH_ALEN);
+        }
+
+        memcpy(config, &netcfg, n->config_size);
     }
 }
 
-- 
2.31.1