vdpasim: allow to assign a MAC address

Add macaddr parameter to the module to set the MAC address to use

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Link: https://lore.kernel.org/r/20201029122050.776445-3-lvivier@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index 3192ce4..9e9ead8 100644 (file)
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -38,6 +38,10 @@ static int batch_mapping = 1;
 module_param(batch_mapping, int, 0444);
 MODULE_PARM_DESC(batch_mapping, "Batched mapping 1 -Enable; 0 - Disable");
 
+static char *macaddr;
+module_param(macaddr, charp, 0);
+MODULE_PARM_DESC(macaddr, "Ethernet MAC address");
+
 struct vdpasim_virtqueue {
        struct vringh vring;
        struct vringh_kiov iov;
@@ -375,7 +379,15 @@ static struct vdpasim *vdpasim_create(void)
        if (!vdpasim->buffer)
                goto err_iommu;
 
-       eth_random_addr(vdpasim->config.mac);
+       if (macaddr) {
+               mac_pton(macaddr, vdpasim->config.mac);
+               if (!is_valid_ether_addr(vdpasim->config.mac)) {
+                       ret = -EADDRNOTAVAIL;
+                       goto err_iommu;
+               }
+       } else {
+               eth_random_addr(vdpasim->config.mac);
+       }
 
        vringh_set_iotlb(&vdpasim->vqs[0].vring, vdpasim->iommu);
        vringh_set_iotlb(&vdpasim->vqs[1].vring, vdpasim->iommu);