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authorLeon Romanovsky <leonro@mellanox.com>2019-02-18 22:25:44 +0200
committerJason Gunthorpe <jgg@mellanox.com>2019-02-18 21:04:36 -0700
commit18c4c66f76d99df89ad682ba25bafb9227e8ec30 (patch)
tree78a0d4190c3e416bda0a1ff4cc372c1d4fd70b6e
parentfd47c2f99f04249d1ba82c422d1818dcbe193908 (diff)
RDMA/restrack: Translate from ID to restrack object
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>
-rw-r--r--drivers/infiniband/core/restrack.c25
-rw-r--r--include/rdma/restrack.h3
2 files changed, 28 insertions, 0 deletions
diff --git a/drivers/infiniband/core/restrack.c b/drivers/infiniband/core/restrack.c
index b4f302811858..ac97167da81c 100644
--- a/drivers/infiniband/core/restrack.c
+++ b/drivers/infiniband/core/restrack.c
@@ -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;
diff --git a/include/rdma/restrack.h b/include/rdma/restrack.h
index 16e11b4c3ec3..44ce32cc0b51 100644
--- a/include/rdma/restrack.h
+++ b/include/rdma/restrack.h
@@ -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_ */