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>

diff --git a/drivers/infiniband/core/restrack.c b/drivers/infiniband/core/restrack.c
index b4f3028..ac97167 100644 (file)
--- 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 16e11b4..44ce32c 100644 (file)
--- 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_ */