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netdevsim: support taking immediate snapshot via devlink

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Implement the .snapshot region operation for the dummy data region. This
enables a region snapshot to be taken upon request via the new
DEVLINK_CMD_REGION_SNAPSHOT command.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jacob Keller 2020-03-26 11:37:17 -07:00 • committed by David S. Miller
parent b9a17abfde
commit 3fe0fd531a
2 changed files with 35 additions and 9 deletions
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34
drivers/net/netdevsim/dev.c
View file

@ -39,17 +39,11 @@ static struct dentry *nsim_dev_ddir;
#define NSIM_DEV_DUMMY_REGION_SIZE (1024 * 32) #define NSIM_DEV_DUMMY_REGION_SIZE (1024 * 32)
static ssize_t nsim_dev_take_snapshot_write(struct file *file, static int
const char __user *data, nsim_dev_take_snapshot(struct devlink *devlink, struct netlink_ext_ack *extack,
size_t count, loff_t *ppos) u8 **data)
{ {
struct nsim_dev *nsim_dev = file->private_data;
struct devlink *devlink;
void *dummy_data; void *dummy_data;
int err;
u32 id;
devlink = priv_to_devlink(nsim_dev);
dummy_data = kmalloc(NSIM_DEV_DUMMY_REGION_SIZE, GFP_KERNEL); dummy_data = kmalloc(NSIM_DEV_DUMMY_REGION_SIZE, GFP_KERNEL);
if (!dummy_data) if (!dummy_data)
@ -57,6 +51,27 @@ static ssize_t nsim_dev_take_snapshot_write(struct file *file,
get_random_bytes(dummy_data, NSIM_DEV_DUMMY_REGION_SIZE); 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;
u8 *dummy_data;
int err;
u32 id;
devlink = priv_to_devlink(nsim_dev);
err = nsim_dev_take_snapshot(devlink, NULL, &dummy_data);
if (err)
return err;
err = devlink_region_snapshot_id_get(devlink, &id); err = devlink_region_snapshot_id_get(devlink, &id);
if (err) { if (err) {
pr_err("Failed to get snapshot id\n"); pr_err("Failed to get snapshot id\n");
@ -351,6 +366,7 @@ static void nsim_devlink_param_load_driverinit_values(struct devlink *devlink)
static const struct devlink_region_ops dummy_region_ops = { static const struct devlink_region_ops dummy_region_ops = {
.name = "dummy", .name = "dummy",
.destructor = &kfree, .destructor = &kfree,
.snapshot = nsim_dev_take_snapshot,
}; };
static int nsim_dev_dummy_region_init(struct nsim_dev *nsim_dev, static int nsim_dev_dummy_region_init(struct nsim_dev *nsim_dev,

10
tools/testing/selftests/drivers/net/netdevsim/devlink.sh
View file

@ -141,6 +141,16 @@ regions_test()
check_region_snapshot_count dummy post-first-delete 2 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" log_test "regions test"
} }