From: Jacob Keller <jacob.e.keller@intel.com>
Date: Thu, 26 Mar 2020 11:37:17 -0700
Subject: netdevsim: support taking immediate snapshot via devlink
Patch-mainline: v5.7-rc1
Git-commit: 3fe0fd531a35c229f8309c8b74ef0226de2626ab
References: jsc#SLE-15075
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>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/netdevsim/dev.c | 28 +++++++++++----
tools/testing/selftests/drivers/net/netdevsim/devlink.sh | 10 +++++
2 files changed, 32 insertions(+), 6 deletions(-)
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -38,23 +38,38 @@ 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) {
@@ -256,6 +271,7 @@ static void nsim_devlink_param_load_driv
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,
--- a/tools/testing/selftests/drivers/net/netdevsim/devlink.sh
+++ b/tools/testing/selftests/drivers/net/netdevsim/devlink.sh
@@ -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"
}