From 18c4c66f76d99df89ad682ba25bafb9227e8ec30 Mon Sep 17 00:00:00 2001
From: Leon Romanovsky <leonro@mellanox.com>
Date: Mon, 18 Feb 2019 22:25:44 +0200
Subject: [PATCH] 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>
---
drivers/infiniband/core/restrack.c | 25 +++++++++++++++++++++++++
include/rdma/restrack.h | 3 +++
2 files changed, 28 insertions(+)
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_ */