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devlink: Add callback to query for snapshot id before snapshot create
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>
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2 changed files with 29 additions and 0 deletions
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@ -29,6 +29,7 @@ struct devlink {
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struct list_head resource_list;
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struct list_head param_list;
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struct list_head region_list;
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u32 snapshot_id;
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struct devlink_dpipe_headers *dpipe_headers;
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const struct devlink_ops *ops;
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struct device *dev;
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@ -551,6 +552,7 @@ struct devlink_region *devlink_region_create(struct devlink *devlink,
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u32 region_max_snapshots,
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u64 region_size);
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void devlink_region_destroy(struct devlink_region *region);
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u32 devlink_region_shapshot_id_get(struct devlink *devlink);
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#else
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@ -792,6 +794,12 @@ devlink_region_destroy(struct devlink_region *region)
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{
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}
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static inline u32
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devlink_region_shapshot_id_get(struct devlink *devlink)
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{
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return 0;
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}
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#endif
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#endif /* _NET_DEVLINK_H_ */
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@ -4193,6 +4193,27 @@ void devlink_region_destroy(struct devlink_region *region)
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}
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EXPORT_SYMBOL_GPL(devlink_region_destroy);
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/**
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* devlink_region_shapshot_id_get - get snapshot ID
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*
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* This callback should be called when adding a new snapshot,
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* Driver should use the same id for multiple snapshots taken
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* on multiple regions at the same time/by the same trigger.
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*
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* @devlink: devlink
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*/
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u32 devlink_region_shapshot_id_get(struct devlink *devlink)
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{
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u32 id;
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mutex_lock(&devlink->lock);
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id = ++devlink->snapshot_id;
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mutex_unlock(&devlink->lock);
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return id;
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}
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EXPORT_SYMBOL_GPL(devlink_region_shapshot_id_get);
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static int __init devlink_module_init(void)
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{
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return genl_register_family(&devlink_nl_family);
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