netdev - [PATCH 3/4] vdpa_sim_net: don't always set VIRTIO_NET_F

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Date:   Sun, 22 Jan 2023 11:05:25 +0100
From:   Laurent Vivier <lvivier@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Parav Pandit <parav@...dia.com>,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        Eli Cohen <elic@...dia.com>, Jason Wang <jasowang@...hat.com>,
        Gautam Dawar <gautam.dawar@...inx.com>,
        Cindy Lu <lulu@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eugenio Pérez <eperezma@...hat.com>
Subject: [PATCH 3/4] vdpa_sim_net: don't always set VIRTIO_NET_F_MAC

if vdpa dev command doesn't set a MAC address, don't report
VIRTIO_NET_F_MAC.

As vdpa_sim_net sets VIRTIO_NET_F_MAC without setting the MAC address,
virtio-net doesn't set a random one and the address appears to be the
zero MAC address.

Signed-off-by: Laurent Vivier <lvivier@...hat.com>
---
 drivers/vdpa/vdpa_sim/vdpa_sim_net.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
index 584b975a98a7..28e858659b85 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
@@ -257,6 +257,12 @@ static int vdpasim_net_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
 	dev_attr.work_fn = vdpasim_net_work;
 	dev_attr.buffer_size = PAGE_SIZE;
 
+	/* if vdpa dev doesn't provide a MAC address,
+	 * don't report we have one
+	 */
+	if (!(config->mask & (1 << VDPA_ATTR_DEV_NET_CFG_MACADDR)))
+		dev_attr.supported_features &= ~(1ULL << VIRTIO_NET_F_MAC);
+
 	simdev = vdpasim_create(&dev_attr, config);
 	if (IS_ERR(simdev))
 		return PTR_ERR(simdev);
-- 
2.39.0