RDMA/core: Add resource tracking for create and destroy QPs

Track create and destroy operations of QP objects.

Reviewed-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

Author: Leon Romanovsky

drivers/infiniband/core/core_priv.h

@@ -301,4 +301,31 @@ struct ib_device *ib_device_get_by_index(u32 ifindex);
 /* RDMA device netlink */
 void nldev_init(void);
 void nldev_exit(void);
+
+static inline struct ib_qp *_ib_create_qp(struct ib_device *dev,
+					  struct ib_pd *pd,
+					  struct ib_qp_init_attr *attr,
+					  struct ib_udata *udata)
+{
+	struct ib_qp *qp;
+
+	qp = dev->create_qp(pd, attr, udata);
+	if (IS_ERR(qp))
+		return qp;
+
+	qp->device = dev;
+	qp->pd = pd;
+	/*
+	 * We don't track XRC QPs for now, because they don't have PD
+	 * and more importantly they are created internaly by driver,
+	 * see mlx5 create_dev_resources() as an example.
+	 */
+	if (attr->qp_type < IB_QPT_XRC_INI) {
+		qp->res.type = RDMA_RESTRACK_QP;
+		rdma_restrack_add(&qp->res);
+	} else
+		qp->res.valid = false;
+
+	return qp;
+}
 #endif /* _CORE_PRIV_H */

drivers/infiniband/core/uverbs_cmd.c

@@ -1514,7 +1514,7 @@ static int create_qp(struct ib_uverbs_file *file,
 	if (cmd->qp_type == IB_QPT_XRC_TGT)
 		qp = ib_create_qp(pd, &attr);
 	else
-		qp = device->create_qp(pd, &attr, uhw);
+		qp = _ib_create_qp(device, pd, &attr, uhw);
 
 	if (IS_ERR(qp)) {
 		ret = PTR_ERR(qp);
@@ -1527,7 +1527,6 @@ static int create_qp(struct ib_uverbs_file *file,
 			goto err_cb;
 
 		qp->real_qp	  = qp;
-		qp->device	  = device;
 		qp->pd		  = pd;
 		qp->send_cq	  = attr.send_cq;
 		qp->recv_cq	  = attr.recv_cq;

drivers/infiniband/core/verbs.c

@@ -882,7 +882,7 @@ struct ib_qp *ib_create_qp(struct ib_pd *pd,
 	if (qp_init_attr->cap.max_rdma_ctxs)
 		rdma_rw_init_qp(device, qp_init_attr);
 
-	qp = device->create_qp(pd, qp_init_attr, NULL);
+	qp = _ib_create_qp(device, pd, qp_init_attr, NULL);
 	if (IS_ERR(qp))
 		return qp;
 
@@ -892,7 +892,6 @@ struct ib_qp *ib_create_qp(struct ib_pd *pd,
 		return ERR_PTR(ret);
 	}
 
-	qp->device     = device;
 	qp->real_qp    = qp;
 	qp->uobject    = NULL;
 	qp->qp_type    = qp_init_attr->qp_type;
@@ -922,7 +921,6 @@ struct ib_qp *ib_create_qp(struct ib_pd *pd,
 			atomic_inc(&qp_init_attr->srq->usecnt);
 	}
 
-	qp->pd	    = pd;
 	qp->send_cq = qp_init_attr->send_cq;
 	qp->xrcd    = NULL;
 
@@ -1538,6 +1536,7 @@ int ib_destroy_qp(struct ib_qp *qp)
 	if (!qp->uobject)
 		rdma_rw_cleanup_mrs(qp);
 
+	rdma_restrack_del(&qp->res);
 	ret = qp->device->destroy_qp(qp);
 	if (!ret) {
 		if (pd)