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Commit 4418f862 authored by Jiri Pirko's avatar Jiri Pirko Committed by David S. Miller
Browse files

netdevsim: implement support for devlink region and snapshots 



Implement dummy region of size 32K and allow user to create snapshots
or random data using debugfs file trigger.

Signed-off-by: default avatarJiri Pirko <jiri@mellanox.com>
Reviewed-by: default avatarJakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent bd00cc36

drivers/net/netdevsim/dev.c

+62 −1
Original line number Diff line number Diff line
@@ -27,6 +27,41 @@ 


static struct dentry *nsim_dev_ddir;



#define NSIM_DEV_DUMMY_REGION_SIZE (1024 * 32)



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;

	void *dummy_data;

	int err;

	u32 id;



	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);



	id = devlink_region_shapshot_id_get(priv_to_devlink(nsim_dev));

	err = devlink_region_snapshot_create(nsim_dev->dummy_region,

					     dummy_data, id, kfree);

	if (err) {

		pr_err("Failed to create region snapshot\n");

		kfree(dummy_data);

		return err;

	}



	return count;

}



static const struct file_operations nsim_dev_take_snapshot_fops = {

	.open = simple_open,

	.write = nsim_dev_take_snapshot_write,

	.llseek = generic_file_llseek,

};



static int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev)

{

	char dev_ddir_name[16];
@@ -44,6 +79,8 @@ static int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev) 
			   &nsim_dev->max_macs);

	debugfs_create_bool("test1", 0600, nsim_dev->ddir,

			    &nsim_dev->test1);

	debugfs_create_file("take_snapshot", 0200, nsim_dev->ddir, nsim_dev,

			    &nsim_dev_take_snapshot_fops);

	return 0;

}
@@ -248,6 +285,23 @@ static void nsim_devlink_param_load_driverinit_values(struct devlink *devlink) 
		nsim_dev->test1 = saved_value.vbool;

}



#define NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX 16



static int nsim_dev_dummy_region_init(struct nsim_dev *nsim_dev,

				      struct devlink *devlink)

{

	nsim_dev->dummy_region =

		devlink_region_create(devlink, "dummy",

				      NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX,

				      NSIM_DEV_DUMMY_REGION_SIZE);

	return PTR_ERR_OR_ZERO(nsim_dev->dummy_region);

}



static void nsim_dev_dummy_region_exit(struct nsim_dev *nsim_dev)

{

	devlink_region_destroy(nsim_dev->dummy_region);

}



static int nsim_dev_reload(struct devlink *devlink,

			   struct netlink_ext_ack *extack)

{
@@ -363,10 +417,14 @@ nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev, unsigned int port_count) 
		goto err_dl_unregister;

	nsim_devlink_set_params_init_values(nsim_dev, devlink);



	err = nsim_dev_debugfs_init(nsim_dev);

	err = nsim_dev_dummy_region_init(nsim_dev, devlink);

	if (err)

		goto err_params_unregister;



	err = nsim_dev_debugfs_init(nsim_dev);

	if (err)

		goto err_dummy_region_exit;



	err = nsim_bpf_dev_init(nsim_dev);

	if (err)

		goto err_debugfs_exit;
@@ -376,6 +434,8 @@ nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev, unsigned int port_count) 


err_debugfs_exit:

	nsim_dev_debugfs_exit(nsim_dev);

err_dummy_region_exit:

	nsim_dev_dummy_region_exit(nsim_dev);

err_params_unregister:

	devlink_params_unregister(devlink, nsim_devlink_params,

				  ARRAY_SIZE(nsim_devlink_params));
@@ -396,6 +456,7 @@ static void nsim_dev_destroy(struct nsim_dev *nsim_dev) 


	nsim_bpf_dev_exit(nsim_dev);

	nsim_dev_debugfs_exit(nsim_dev);

	nsim_dev_dummy_region_exit(nsim_dev);

	devlink_params_unregister(devlink, nsim_devlink_params,

				  ARRAY_SIZE(nsim_devlink_params));

	devlink_unregister(devlink);

drivers/net/netdevsim/netdevsim.h

+1 −0
Original line number Diff line number Diff line
@@ -160,6 +160,7 @@ struct nsim_dev { 
	bool fw_update_status;

	u32 max_macs;

	bool test1;

	struct devlink_region *dummy_region;

};



int nsim_dev_init(void);