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devlink: Add callback to query for snapshot id before snapshot create

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To restrict the driver with the snapshot ID selection a new callback
is introduced for the driver to get the snapshot ID before creating
a new snapshot. This will also allow giving the same ID for multiple
snapshots taken of different regions on the same time.

Signed-off-by: Alex Vesker <valex@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alex Vesker 2018-07-12 15:13:09 +03:00 committed by David S. Miller
parent b16ebe925a
commit ccadfa444b
2 changed files with 29 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

8
include/net/devlink.h
View file

@ -29,6 +29,7 @@ struct devlink {
struct list_head resource_list;
struct list_head param_list;
struct list_head region_list;
u32 snapshot_id;
struct devlink_dpipe_headers *dpipe_headers;
const struct devlink_ops *ops;
struct device *dev;
@ -551,6 +552,7 @@ struct devlink_region *devlink_region_create(struct devlink *devlink,
u32 region_max_snapshots,
u64 region_size);
void devlink_region_destroy(struct devlink_region *region);
u32 devlink_region_shapshot_id_get(struct devlink *devlink);
#else
@ -792,6 +794,12 @@ devlink_region_destroy(struct devlink_region *region)
{
}
static inline u32
devlink_region_shapshot_id_get(struct devlink *devlink)
{
return 0;
}
#endif
#endif /* _NET_DEVLINK_H_ */

21
net/core/devlink.c
View file

@ -4193,6 +4193,27 @@ void devlink_region_destroy(struct devlink_region *region)
}
EXPORT_SYMBOL_GPL(devlink_region_destroy);
/**
* devlink_region_shapshot_id_get - get snapshot ID
*
* This callback should be called when adding a new snapshot,
* Driver should use the same id for multiple snapshots taken
* on multiple regions at the same time/by the same trigger.
*
* @devlink: devlink
*/
u32 devlink_region_shapshot_id_get(struct devlink *devlink)
{
u32 id;
mutex_lock(&devlink->lock);
id = ++devlink->snapshot_id;
mutex_unlock(&devlink->lock);
return id;
}
EXPORT_SYMBOL_GPL(devlink_region_shapshot_id_get);
static int __init devlink_module_init(void)
{
return genl_register_family(&devlink_nl_family);