RDMA/restrack: Resource-tracker should not use uobject pointers

Having uobject pointer embedded in ib core objects is not aligned with a
future shared ib_x model. The resource tracker only does this to keep
track of user/kernel objects - track this directly instead.

Signed-off-by: Shamir Rabinovitch <shamir.rabinovitch@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

8 files changed, 46 insertions, 42 deletions

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 15d5bb7bf6bb..63a7cc00bae0 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -494,7 +494,7 @@ static void _cma_attach_to_dev(struct rdma_id_private *id_priv,
 	id_priv->id.route.addr.dev_addr.transport =
 		rdma_node_get_transport(cma_dev->device->node_type);
 	list_add_tail(&id_priv->list, &cma_dev->id_list);
-	rdma_restrack_add(&id_priv->res);
+	rdma_restrack_kadd(&id_priv->res);
 }
 
 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
diff --git a/drivers/infiniband/core/core_priv.h b/drivers/infiniband/core/core_priv.h
index cea92624f9d4..3cd830d52967 100644
--- a/drivers/infiniband/core/core_priv.h
+++ b/drivers/infiniband/core/core_priv.h
@@ -297,7 +297,10 @@ static inline struct ib_qp *_ib_create_qp(struct ib_device *dev,
 	 */
 	if (attr->qp_type < IB_QPT_XRC_INI) {
 		qp->res.type = RDMA_RESTRACK_QP;
-		rdma_restrack_add(&qp->res);
+		if (uobj)
+			rdma_restrack_uadd(&qp->res);
+		else
+			rdma_restrack_kadd(&qp->res);
 	} else
 		qp->res.valid = false;
 
diff --git a/drivers/infiniband/core/cq.c b/drivers/infiniband/core/cq.c
index 7fb4f64ae933..d61e5e1427c2 100644
--- a/drivers/infiniband/core/cq.c
+++ b/drivers/infiniband/core/cq.c
@@ -162,7 +162,7 @@ struct ib_cq *__ib_alloc_cq(struct ib_device *dev, void *private,
 
 	cq->res.type = RDMA_RESTRACK_CQ;
 	rdma_restrack_set_task(&cq->res, caller);
-	rdma_restrack_add(&cq->res);
+	rdma_restrack_kadd(&cq->res);
 
 	switch (cq->poll_ctx) {
 	case IB_POLL_DIRECT:
diff --git a/drivers/infiniband/core/restrack.c b/drivers/infiniband/core/restrack.c
index 3dd316159f5f..46a5c553c624 100644
--- a/drivers/infiniband/core/restrack.c
+++ b/drivers/infiniband/core/restrack.c
@@ -139,27 +139,6 @@ static struct ib_device *res_to_dev(struct rdma_restrack_entry *res)
 	}
 }
 
-static bool res_is_user(struct rdma_restrack_entry *res)
-{
-	switch (res->type) {
-	case RDMA_RESTRACK_PD:
-		return container_of(res, struct ib_pd, res)->uobject;
-	case RDMA_RESTRACK_CQ:
-		return container_of(res, struct ib_cq, res)->uobject;
-	case RDMA_RESTRACK_QP:
-		return container_of(res, struct ib_qp, res)->uobject;
-	case RDMA_RESTRACK_CM_ID:
-		return !res->kern_name;
-	case RDMA_RESTRACK_MR:
-		return container_of(res, struct ib_mr, res)->pd->uobject;
-	case RDMA_RESTRACK_CTX:
-		return true;
-	default:
-		WARN_ONCE(true, "Wrong resource tracking type %u\n", res->type);
-		return false;
-	}
-}
-
 void rdma_restrack_set_task(struct rdma_restrack_entry *res,
 			    const char *caller)
 {
@@ -175,17 +154,17 @@ void rdma_restrack_set_task(struct rdma_restrack_entry *res,
 }
 EXPORT_SYMBOL(rdma_restrack_set_task);
 
-void rdma_restrack_add(struct rdma_restrack_entry *res)
+static void rdma_restrack_add(struct rdma_restrack_entry *res)
 {
 	struct ib_device *dev = res_to_dev(res);
 
 	if (!dev)
 		return;
 
-	if (res->type != RDMA_RESTRACK_CM_ID || !res_is_user(res))
+	if (res->type != RDMA_RESTRACK_CM_ID || rdma_is_kernel_res(res))
 		res->task = NULL;
 
-	if (res_is_user(res)) {
+	if (!rdma_is_kernel_res(res)) {
 		if (!res->task)
 			rdma_restrack_set_task(res, NULL);
 		res->kern_name = NULL;
@@ -201,7 +180,28 @@ void rdma_restrack_add(struct rdma_restrack_entry *res)
 	hash_add(dev->res.hash, &res->node, res->type);
 	up_write(&dev->res.rwsem);
 }
-EXPORT_SYMBOL(rdma_restrack_add);
+
+/**
+ * rdma_restrack_kadd() - add kernel object to the reource tracking database
+ * @res:  resource entry
+ */
+void rdma_restrack_kadd(struct rdma_restrack_entry *res)
+{
+	res->user = false;
+	rdma_restrack_add(res);
+}
+EXPORT_SYMBOL(rdma_restrack_kadd);
+
+/**
+ * rdma_restrack_uadd() - add user object to the reource tracking database
+ * @res:  resource entry
+ */
+void rdma_restrack_uadd(struct rdma_restrack_entry *res)
+{
+	res->user = true;
+	rdma_restrack_add(res);
+}
+EXPORT_SYMBOL(rdma_restrack_uadd);
 
 int __must_check rdma_restrack_get(struct rdma_restrack_entry *res)
 {
diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 357d33120ca4..17be53da21b0 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -262,7 +262,7 @@ static int ib_uverbs_get_context(struct uverbs_attr_bundle *attrs)
 	fd_install(resp.async_fd, filp);
 
 	ucontext->res.type = RDMA_RESTRACK_CTX;
-	rdma_restrack_add(&ucontext->res);
+	rdma_restrack_uadd(&ucontext->res);
 
 	/*
 	 * Make sure that ib_uverbs_get_ucontext() sees the pointer update
@@ -472,7 +472,7 @@ static int ib_uverbs_alloc_pd(struct uverbs_attr_bundle *attrs)
 	memset(&resp, 0, sizeof resp);
 	resp.pd_handle = uobj->id;
 	pd->res.type = RDMA_RESTRACK_PD;
-	rdma_restrack_add(&pd->res);
+	rdma_restrack_uadd(&pd->res);
 
 	ret = uverbs_response(attrs, &resp, sizeof(resp));
 	if (ret)
@@ -788,7 +788,7 @@ static int ib_uverbs_reg_mr(struct uverbs_attr_bundle *attrs)
 	mr->uobject = uobj;
 	atomic_inc(&pd->usecnt);
 	mr->res.type = RDMA_RESTRACK_MR;
-	rdma_restrack_add(&mr->res);
+	rdma_restrack_uadd(&mr->res);
 
 	uobj->object = mr;
 
@@ -1066,7 +1066,7 @@ static struct ib_ucq_object *create_cq(struct uverbs_attr_bundle *attrs,
 	resp.response_length = uverbs_response_length(attrs, sizeof(resp));
 
 	cq->res.type = RDMA_RESTRACK_CQ;
-	rdma_restrack_add(&cq->res);
+	rdma_restrack_uadd(&cq->res);
 
 	ret = uverbs_response(attrs, &resp, sizeof(resp));
 	if (ret)
diff --git a/drivers/infiniband/core/uverbs_std_types_cq.c b/drivers/infiniband/core/uverbs_std_types_cq.c
index 42df59635a3c..a59ea89e3f2b 100644
--- a/drivers/infiniband/core/uverbs_std_types_cq.c
+++ b/drivers/infiniband/core/uverbs_std_types_cq.c
@@ -126,7 +126,7 @@ static int UVERBS_HANDLER(UVERBS_METHOD_CQ_CREATE)(
 	obj->uobject.user_handle = user_handle;
 	atomic_set(&cq->usecnt, 0);
 	cq->res.type = RDMA_RESTRACK_CQ;
-	rdma_restrack_add(&cq->res);
+	rdma_restrack_uadd(&cq->res);
 
 	ret = uverbs_copy_to(attrs, UVERBS_ATTR_CREATE_CQ_RESP_CQE, &cq->cqe,
 			     sizeof(cq->cqe));
diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index 92dbc758f6c9..bc0b3a150e3c 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -277,7 +277,7 @@ struct ib_pd *__ib_alloc_pd(struct ib_device *device, unsigned int flags,
 
 	pd->res.type = RDMA_RESTRACK_PD;
 	rdma_restrack_set_task(&pd->res, caller);
-	rdma_restrack_add(&pd->res);
+	rdma_restrack_kadd(&pd->res);
 
 	if (mr_access_flags) {
 		struct ib_mr *mr;
@@ -1902,7 +1902,7 @@ struct ib_cq *__ib_create_cq(struct ib_device *device,
 		atomic_set(&cq->usecnt, 0);
 		cq->res.type = RDMA_RESTRACK_CQ;
 		rdma_restrack_set_task(&cq->res, caller);
-		rdma_restrack_add(&cq->res);
+		rdma_restrack_kadd(&cq->res);
 	}
 
 	return cq;
@@ -1984,7 +1984,7 @@ struct ib_mr *ib_alloc_mr(struct ib_pd *pd,
 		atomic_inc(&pd->usecnt);
 		mr->need_inval = false;
 		mr->res.type = RDMA_RESTRACK_MR;
-		rdma_restrack_add(&mr->res);
+		rdma_restrack_kadd(&mr->res);
 	}
 
 	return mr;
diff --git a/include/rdma/restrack.h b/include/rdma/restrack.h
index f34aa96e4518..8f179be9d9a9 100644
--- a/include/rdma/restrack.h
+++ b/include/rdma/restrack.h
@@ -116,6 +116,10 @@ struct rdma_restrack_entry {
 	 * @type: various objects in restrack database
 	 */
 	enum rdma_restrack_type	type;
+	/**
+	 * @user: user resource
+	 */
+	bool			user;
 };
 
 /**
@@ -140,11 +144,8 @@ int rdma_restrack_count(struct rdma_restrack_root *res,
 			enum rdma_restrack_type type,
 			struct pid_namespace *ns);
 
-/**
- * rdma_restrack_add() - add object to the reource tracking database
- * @res:  resource entry
- */
-void rdma_restrack_add(struct rdma_restrack_entry *res);
+void rdma_restrack_kadd(struct rdma_restrack_entry *res);
+void rdma_restrack_uadd(struct rdma_restrack_entry *res);
 
 /**
  * rdma_restrack_del() - delete object from the reource tracking database
@@ -159,7 +160,7 @@ void rdma_restrack_del(struct rdma_restrack_entry *res);
  */
 static inline bool rdma_is_kernel_res(struct rdma_restrack_entry *res)
 {
-	return !res->task;
+	return !res->user;
 }
 
 /**