[PATCH linux-next v2 2/7] vdpa_sim_net: Add module param to disable default vdpa net device

[Parav Pandit <parav@nvidia.com>]

To support creating multiple vdpa devices and to allow user to
manage them, add a knob to disable a default vdpa net device.

Signed-off-by: Parav Pandit <parav@nvidia.com>
---
Changelog:
v1->v2:
 - new patch
---
 drivers/vdpa/vdpa_sim/vdpa_sim_net.c | 41 ++++++++++++++++++++--------
 1 file changed, 29 insertions(+), 12 deletions(-)

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
index f0482427186b..34155831538c 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
@@ -33,6 +33,10 @@ static char *macaddr;
 module_param(macaddr, charp, 0);
 MODULE_PARM_DESC(macaddr, "Ethernet MAC address");
 
+static bool default_device = true;
+module_param(default_device, bool, 0);
+MODULE_PARM_DESC(default_device, "Support single default VDPA device");
+
 static u8 macaddr_buf[ETH_ALEN];
 
 static struct vdpasim *vdpasim_net_dev;
@@ -120,21 +124,11 @@ static void vdpasim_net_get_config(struct vdpasim *vdpasim, void *config)
 	memcpy(net_config->mac, macaddr_buf, ETH_ALEN);
 }
 
-static int __init vdpasim_net_init(void)
+static int vdpasim_net_default_dev_register(void)
 {
 	struct vdpasim_dev_attr dev_attr = {};
 	int ret;
 
-	if (macaddr) {
-		mac_pton(macaddr, macaddr_buf);
-		if (!is_valid_ether_addr(macaddr_buf)) {
-			ret = -EADDRNOTAVAIL;
-			goto out;
-		}
-	} else {
-		eth_random_addr(macaddr_buf);
-	}
-
 	dev_attr.id = VIRTIO_ID_NET;
 	dev_attr.supported_features = VDPASIM_NET_FEATURES;
 	dev_attr.nvqs = VDPASIM_NET_VQ_NUM;
@@ -161,13 +155,36 @@ static int __init vdpasim_net_init(void)
 	return ret;
 }
 
-static void __exit vdpasim_net_exit(void)
+static void vdpasim_net_default_dev_unregister(void)
 {
 	struct vdpa_device *vdpa = &vdpasim_net_dev->vdpa;
 
 	vdpa_unregister_device(vdpa);
 }
 
+static int __init vdpasim_net_init(void)
+{
+	int ret = 0;
+
+	if (macaddr) {
+		mac_pton(macaddr, macaddr_buf);
+		if (!is_valid_ether_addr(macaddr_buf))
+			return -EADDRNOTAVAIL;
+	} else {
+		eth_random_addr(macaddr_buf);
+	}
+
+	if (default_device)
+		ret = vdpasim_net_default_dev_register();
+	return ret;
+}
+
+static void __exit vdpasim_net_exit(void)
+{
+	if (default_device)
+		vdpasim_net_default_dev_unregister();
+}
+
 module_init(vdpasim_net_init);
 module_exit(vdpasim_net_exit);
 
-- 
2.26.2