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RDMA/restrack: Translate from ID to restrack object

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Add new general helper to get restrack entry given by ID and their
respective type.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Leon Romanovsky 2019-02-18 22:25:44 +02:00 committed by Jason Gunthorpe
parent fd47c2f99f
commit 18c4c66f76
2 changed files with 28 additions and 0 deletions
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25
drivers/infiniband/core/restrack.c
View File

@ -256,6 +256,31 @@ int __must_check rdma_restrack_get(struct rdma_restrack_entry *res)
}
EXPORT_SYMBOL(rdma_restrack_get);
/**
* rdma_restrack_get_byid() - translate from ID to restrack object
* @dev: IB device
* @type: resource track type
* @id: ID to take a look
*
* Return: Pointer to restrack entry or -ENOENT in case of error.
*/
struct rdma_restrack_entry *
rdma_restrack_get_byid(struct ib_device *dev,
enum rdma_restrack_type type, u32 id)
{
struct rdma_restrack_root *rt = &dev->res;
struct rdma_restrack_entry *res;
down_read(&dev->res.rwsem);
res = xa_load(&rt->xa[type], id);
if (!res || !rdma_restrack_get(res))
res = ERR_PTR(-ENOENT);
up_read(&dev->res.rwsem);
return res;
}
EXPORT_SYMBOL(rdma_restrack_get_byid);
static void restrack_release(struct kref *kref)
{
struct rdma_restrack_entry *res;

3
include/rdma/restrack.h
View File

@ -179,4 +179,7 @@ int rdma_nl_put_driver_u32_hex(struct sk_buff *msg, const char *name,
int rdma_nl_put_driver_u64(struct sk_buff *msg, const char *name, u64 value);
int rdma_nl_put_driver_u64_hex(struct sk_buff *msg, const char *name,
u64 value);
struct rdma_restrack_entry *rdma_restrack_get_byid(struct ib_device *dev,
enum rdma_restrack_type type,
u32 id);
#endif /* _RDMA_RESTRACK_H_ */