netdevsim: move device registration and related code to bus.c
Move netdevsim device registration into bus.c and alongside with that
the related sysfs attributes. Introduce new struct nsim_bus_dev to
represent a netdevsim device on netdevsim bus.
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/netdevsim/bus.c b/drivers/net/netdevsim/bus.c
index 26b866b..7e83a2e 100644
--- a/drivers/net/netdevsim/bus.c
+++ b/drivers/net/netdevsim/bus.c
@@ -4,15 +4,155 @@
*/
#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/rtnetlink.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
#include "netdevsim.h"
-struct bus_type nsim_bus = {
+static u32 nsim_bus_dev_id;
+
+static struct nsim_bus_dev *to_nsim_bus_dev(struct device *dev)
+{
+ return container_of(dev, struct nsim_bus_dev, dev);
+}
+
+static int nsim_bus_dev_vfs_enable(struct nsim_bus_dev *nsim_bus_dev,
+ unsigned int num_vfs)
+{
+ nsim_bus_dev->vfconfigs = kcalloc(num_vfs,
+ sizeof(struct nsim_vf_config),
+ GFP_KERNEL);
+ if (!nsim_bus_dev->vfconfigs)
+ return -ENOMEM;
+ nsim_bus_dev->num_vfs = num_vfs;
+
+ return 0;
+}
+
+static void nsim_bus_dev_vfs_disable(struct nsim_bus_dev *nsim_bus_dev)
+{
+ kfree(nsim_bus_dev->vfconfigs);
+ nsim_bus_dev->vfconfigs = NULL;
+ nsim_bus_dev->num_vfs = 0;
+}
+
+static ssize_t
+nsim_bus_dev_numvfs_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
+ unsigned int num_vfs;
+ int ret;
+
+ ret = kstrtouint(buf, 0, &num_vfs);
+ if (ret)
+ return ret;
+
+ rtnl_lock();
+ if (nsim_bus_dev->num_vfs == num_vfs)
+ goto exit_good;
+ if (nsim_bus_dev->num_vfs && num_vfs) {
+ ret = -EBUSY;
+ goto exit_unlock;
+ }
+
+ if (num_vfs) {
+ ret = nsim_bus_dev_vfs_enable(nsim_bus_dev, num_vfs);
+ if (ret)
+ goto exit_unlock;
+ } else {
+ nsim_bus_dev_vfs_disable(nsim_bus_dev);
+ }
+exit_good:
+ ret = count;
+exit_unlock:
+ rtnl_unlock();
+
+ return ret;
+}
+
+static ssize_t
+nsim_bus_dev_numvfs_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
+
+ return sprintf(buf, "%u\n", nsim_bus_dev->num_vfs);
+}
+
+static struct device_attribute nsim_bus_dev_numvfs_attr =
+ __ATTR(sriov_numvfs, 0664, nsim_bus_dev_numvfs_show,
+ nsim_bus_dev_numvfs_store);
+
+static struct attribute *nsim_bus_dev_attrs[] = {
+ &nsim_bus_dev_numvfs_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group nsim_bus_dev_attr_group = {
+ .attrs = nsim_bus_dev_attrs,
+};
+
+static const struct attribute_group *nsim_bus_dev_attr_groups[] = {
+ &nsim_bus_dev_attr_group,
+ NULL,
+};
+
+static void nsim_bus_dev_release(struct device *dev)
+{
+ struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
+
+ nsim_bus_dev_vfs_disable(nsim_bus_dev);
+}
+
+static struct device_type nsim_bus_dev_type = {
+ .groups = nsim_bus_dev_attr_groups,
+ .release = nsim_bus_dev_release,
+};
+
+int nsim_num_vf(struct device *dev)
+{
+ struct nsim_bus_dev *nsim_bus_dev = to_nsim_bus_dev(dev);
+
+ return nsim_bus_dev->num_vfs;
+}
+
+static struct bus_type nsim_bus = {
.name = DRV_NAME,
.dev_name = DRV_NAME,
.num_vf = nsim_num_vf,
};
+struct nsim_bus_dev *nsim_bus_dev_new(void)
+{
+ struct nsim_bus_dev *nsim_bus_dev;
+ int err;
+
+ nsim_bus_dev = kzalloc(sizeof(*nsim_bus_dev), GFP_KERNEL);
+ if (!nsim_bus_dev)
+ return ERR_PTR(-ENOMEM);
+
+ nsim_bus_dev->dev.id = nsim_bus_dev_id++;
+ nsim_bus_dev->dev.bus = &nsim_bus;
+ nsim_bus_dev->dev.type = &nsim_bus_dev_type;
+ err = device_register(&nsim_bus_dev->dev);
+ if (err)
+ goto err_nsim_bus_dev_free;
+ return nsim_bus_dev;
+
+err_nsim_bus_dev_free:
+ kfree(nsim_bus_dev);
+ return ERR_PTR(err);
+}
+
+void nsim_bus_dev_del(struct nsim_bus_dev *nsim_bus_dev)
+{
+ device_unregister(&nsim_bus_dev->dev);
+ kfree(nsim_bus_dev);
+}
+
int nsim_bus_init(void)
{
return bus_register(&nsim_bus);