[PATCH v1 23/24] IB/uverbs: Add clone reference counting to ib_mr

Yuval Shaia
2019-08-21T14:24:19Z

To keep track of shared object life time add ref count to ib_mr

Signed-off-by: Yuval Shaia <yuval.shaia@oracle.com>
---
drivers/infiniband/core/uverbs_cmd.c | 2 ++
include/rdma/ib_verbs.h | 3 +++
2 files changed, 5 insertions(+)

diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 25eab9dc9cad..92f04e7360b6 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -768,8 +768,10 @@ static int ib_uverbs_reg_mr(struct uverbs_attr_bundle *attrs)
atomic_inc(&pd->usecnt);
mr->res.type = RDMA_RESTRACK_MR;
rdma_restrack_uadd(&mr->res);
+ atomic_set(&mr->refcnt, 1);

uobj->object = mr;
+ uobj->refcnt = &mr->refcnt;

memset(&resp, 0, sizeof resp);
resp.lkey = mr->lkey;
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 877932305ea7..80fd78b3b654 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -1794,6 +1794,9 @@ struct ib_mr {
* Implementation details of the RDMA core, don't use in drivers:
*/
struct rdma_restrack_entry res;
+
+ /* number of uobj using this ib_pd */
+ atomic_t refcnt;
};

struct ib_mw {
--
2.20.1