netdevsim: support taking immediate snapshot via devlink (3fe0fd53) · Commits · 戴 / test

drivers/net/netdevsim/dev.c

+22 −6

Original line number	Diff line number	Diff line
		@@ -39,23 +39,38 @@ static struct dentry *nsim_dev_ddir;

		#define NSIM_DEV_DUMMY_REGION_SIZE (1024 * 32)

		static int
		nsim_dev_take_snapshot(struct devlink devlink, struct netlink_ext_ack extack,
		u8 **data)
		{
		void *dummy_data;

		dummy_data = kmalloc(NSIM_DEV_DUMMY_REGION_SIZE, GFP_KERNEL);
		if (!dummy_data)
		return -ENOMEM;

		get_random_bytes(dummy_data, NSIM_DEV_DUMMY_REGION_SIZE);

		*data = dummy_data;

		return 0;
		}

		static ssize_t nsim_dev_take_snapshot_write(struct file *file,
		const char __user *data,
		size_t count, loff_t *ppos)
		{
		struct nsim_dev *nsim_dev = file->private_data;
		struct devlink *devlink;
		void *dummy_data;
		u8 *dummy_data;
		int err;
		u32 id;

		devlink = priv_to_devlink(nsim_dev);

		dummy_data = kmalloc(NSIM_DEV_DUMMY_REGION_SIZE, GFP_KERNEL);
		if (!dummy_data)
		return -ENOMEM;

		get_random_bytes(dummy_data, NSIM_DEV_DUMMY_REGION_SIZE);
		err = nsim_dev_take_snapshot(devlink, NULL, &dummy_data);
		if (err)
		return err;

		err = devlink_region_snapshot_id_get(devlink, &id);
		if (err) {
		@@ -351,6 +366,7 @@ static void nsim_devlink_param_load_driverinit_values(struct devlink *devlink)
		static const struct devlink_region_ops dummy_region_ops = {
		.name = "dummy",
		.destructor = &kfree,
		.snapshot = nsim_dev_take_snapshot,
		};

		static int nsim_dev_dummy_region_init(struct nsim_dev *nsim_dev,

+10 −0

Original line number	Diff line number	Diff line
		@@ -141,6 +141,16 @@ regions_test()

		check_region_snapshot_count dummy post-first-delete 2

		devlink region new $DL_HANDLE/dummy snapshot 25
		check_err $? "Failed to create a new snapshot with id 25"

		check_region_snapshot_count dummy post-first-request 3

		devlink region del $DL_HANDLE/dummy snapshot 25
		check_err $? "Failed to delete snapshot with id 25"

		check_region_snapshot_count dummy post-second-delete 2

		log_test "regions test"
		}