Index: share/man/man9/pci.9
===================================================================
--- share/man/man9/pci.9
+++ share/man/man9/pci.9
@@ -50,6 +50,7 @@
 .Nm pci_get_vpd_ident ,
 .Nm pci_get_vpd_readonly ,
 .Nm pci_iov_attach ,
+.Nm pci_iov_attach_name ,
 .Nm pci_iov_detach ,
 .Nm pci_msi_count ,
 .Nm pci_msix_count ,
@@ -152,6 +153,14 @@
 .Ft int
 .Fn pci_iov_attach "device_t dev" "nvlist_t *pf_schema" "nvlist_t *vf_schema"
 .Ft int
+.Fo pci_iov_attach_name
+.Fa "device_t dev"
+.Fa "nvlist_t *pf_schema"
+.Fa "nvlist_t *vf_schema"
+.Fa "const char *fmt"
+.Fa "..."
+.Fc
+.Ft int
 .Fn pci_iov_detach "device_t dev"
 .Sh DESCRIPTION
 The
@@ -595,6 +604,20 @@
 The driver must never free the schemas itself.
 .Pp
 The
+.Fn pci_iov_attach_name
+function is a variant of
+.Fn pci_iov_attach
+that allows the name of the associated character device in
+.Pa /dev/iov
+to be specified by
+.Fa fmt .
+The
+.Fn pci_iov_attach
+function uses the name of
+.Fa dev
+as the device name.
+.Pp
+The
 .Fn pci_iov_detach
 function is used to advise the SR-IOV infrastructure that the driver for the
 given device is attempting to detach and that all SR-IOV resources for the
Index: sys/dev/pci/pci_if.m
===================================================================
--- sys/dev/pci/pci_if.m
+++ sys/dev/pci/pci_if.m
@@ -235,6 +235,7 @@
 	device_t	child;
 	struct nvlist	*pf_schema;
 	struct nvlist	*vf_schema;
+	const char	*name;
 };
 
 METHOD int iov_detach {
Index: sys/dev/pci/pci_iov.h
===================================================================
--- sys/dev/pci/pci_iov.h
+++ sys/dev/pci/pci_iov.h
@@ -33,11 +33,14 @@
 
 struct nvlist;
 
+int	pci_iov_attach_name(device_t dev, struct nvlist *pf_schema,
+	    struct nvlist *vf_schema, const char *fmt, ...);
+
 static __inline int
 pci_iov_attach(device_t dev, struct nvlist *pf_schema, struct nvlist *vf_schema)
 {
 	return (PCI_IOV_ATTACH(device_get_parent(dev), dev, pf_schema,
-	    vf_schema));
+	    vf_schema, device_get_nameunit(dev)));
 }
 
 static __inline int
Index: sys/dev/pci/pci_iov.c
===================================================================
--- sys/dev/pci/pci_iov.c
+++ sys/dev/pci/pci_iov.c
@@ -98,8 +98,22 @@
 static nvlist_t	*pci_iov_get_vf_subsystem_schema(void);
 
 int
+pci_iov_attach_name(device_t dev, struct nvlist *pf_schema,
+    struct nvlist *vf_schema, const char *fmt, ...)
+{
+	char buf[NAME_MAX + 1];
+	va_list ap;
+
+	va_start(ap, fmt);
+	vsnprintf(buf, sizeof(buf), fmt, ap);
+	va_end(ap);
+	return (PCI_IOV_ATTACH(device_get_parent(dev), dev, pf_schema,
+	    vf_schema, buf));
+}
+
+int
 pci_iov_attach_method(device_t bus, device_t dev, nvlist_t *pf_schema,
-    nvlist_t *vf_schema)
+    nvlist_t *vf_schema, const char *name)
 {
 	device_t pcib;
 	struct pci_devinfo *dinfo;
@@ -149,7 +163,7 @@
 	iov->iov_schema = schema;
 
 	iov->iov_cdev = make_dev(&iov_cdevsw, device_get_unit(dev),
-	    UID_ROOT, GID_WHEEL, 0600, "iov/%s", device_get_nameunit(dev));
+	    UID_ROOT, GID_WHEEL, 0600, "iov/%s", name);
 
 	if (iov->iov_cdev == NULL) {
 		error = ENOMEM;
Index: sys/dev/pci/pci_private.h
===================================================================
--- sys/dev/pci/pci_private.h
+++ sys/dev/pci/pci_private.h
@@ -158,7 +158,8 @@
 		    rman_res_t count, u_long num, u_int flags);
 
 int		pci_iov_attach_method(device_t bus, device_t dev,
-		    struct nvlist *pf_schema, struct nvlist *vf_schema);
+		    struct nvlist *pf_schema, struct nvlist *vf_schema,
+		    const char *name);
 int		pci_iov_detach_method(device_t bus, device_t dev);
 
 device_t	pci_create_iov_child_method(device_t bus, device_t pf,