[PATCH rdma-next v2 6/7] RDMA/core: Properly increment and decrement QP usecnts

Leon Romanovsky
2021-08-03T18:21:14Z

The QP usecnts were incremented through QP attributes structure while
decreased through QP itself. Rely on the ib_creat_qp_user() code that
initialized all QP parameters prior returning to the user and increment
exactly like destroy does.

Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
drivers/infiniband/core/core_priv.h | 2 +
drivers/infiniband/core/uverbs_cmd.c | 13 +---
drivers/infiniband/core/uverbs_std_types_qp.c | 13 +---
drivers/infiniband/core/verbs.c | 60 ++++++++++---------
4 files changed, 39 insertions(+), 49 deletions(-)

diff --git a/drivers/infiniband/core/core_priv.h b/drivers/infiniband/core/core_priv.h
index d28ced053222..d8f464b43dbc 100644
--- a/drivers/infiniband/core/core_priv.h
+++ b/drivers/infiniband/core/core_priv.h
@@ -320,6 +320,8 @@ 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_uqp_object *uobj,
const char *caller);
+void ib_qp_usecnt_inc(struct ib_qp *qp);
+void ib_qp_usecnt_dec(struct ib_qp *qp);

struct rdma_dev_addr;
int rdma_resolve_ip_route(struct sockaddr *src_addr,
diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index b5153200b8a8..62cafd768d89 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -1445,18 +1445,9 @@ static int create_qp(struct uverbs_attr_bundle *attrs,
ret = PTR_ERR(qp);
goto err_put;
}
+ ib_qp_usecnt_inc(qp);

- if (cmd->qp_type != IB_QPT_XRC_TGT) {
- atomic_inc(&pd->usecnt);
- if (attr.send_cq)
- atomic_inc(&attr.send_cq->usecnt);
- if (attr.recv_cq)
- atomic_inc(&attr.recv_cq->usecnt);
- if (attr.srq)
- atomic_inc(&attr.srq->usecnt);
- if (ind_tbl)
- atomic_inc(&ind_tbl->usecnt);
- } else {
+ if (cmd->qp_type == IB_QPT_XRC_TGT) {
/* It is done in _ib_create_qp for other QP types */
qp->uobject = obj;
}
diff --git a/drivers/infiniband/core/uverbs_std_types_qp.c b/drivers/infiniband/core/uverbs_std_types_qp.c
index 92812f6a21b0..a0e734735ba5 100644
--- a/drivers/infiniband/core/uverbs_std_types_qp.c
+++ b/drivers/infiniband/core/uverbs_std_types_qp.c
@@ -258,18 +258,9 @@ static int UVERBS_HANDLER(UVERBS_METHOD_QP_CREATE)(
ret = PTR_ERR(qp);
goto err_put;
}
+ ib_qp_usecnt_inc(qp);

- if (attr.qp_type != IB_QPT_XRC_TGT) {
- atomic_inc(&pd->usecnt);
- if (attr.send_cq)
- atomic_inc(&attr.send_cq->usecnt);
- if (attr.recv_cq)
- atomic_inc(&attr.recv_cq->usecnt);
- if (attr.srq)
- atomic_inc(&attr.srq->usecnt);
- if (attr.rwq_ind_tbl)
- atomic_inc(&attr.rwq_ind_tbl->usecnt);
- } else {
+ if (attr.qp_type == IB_QPT_XRC_TGT) {
obj->uxrcd = container_of(xrcd_uobj, struct ib_uxrcd_object,
uobject);
atomic_inc(&obj->uxrcd->refcnt);
diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index 1f0f0beebe22..a568155b63f5 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -1274,6 +1274,36 @@ struct ib_qp *_ib_create_qp(struct ib_device *dev, struct ib_pd *pd,
}
EXPORT_SYMBOL(_ib_create_qp);

+void ib_qp_usecnt_inc(struct ib_qp *qp)
+{
+ if (qp->pd)
+ atomic_inc(&qp->pd->usecnt);
+ if (qp->send_cq)
+ atomic_inc(&qp->send_cq->usecnt);
+ if (qp->recv_cq)
+ atomic_inc(&qp->recv_cq->usecnt);
+ if (qp->srq)
+ atomic_inc(&qp->srq->usecnt);
+ if (qp->rwq_ind_tbl)
+ atomic_inc(&qp->rwq_ind_tbl->usecnt);
+}
+EXPORT_SYMBOL(ib_qp_usecnt_inc);
+
+void ib_qp_usecnt_dec(struct ib_qp *qp)
+{
+ if (qp->rwq_ind_tbl)
+ atomic_dec(&qp->rwq_ind_tbl->usecnt);
+ if (qp->srq)
+ atomic_dec(&qp->srq->usecnt);
+ if (qp->recv_cq)
+ atomic_dec(&qp->recv_cq->usecnt);
+ if (qp->send_cq)
+ atomic_dec(&qp->send_cq->usecnt);
+ if (qp->pd)
+ atomic_dec(&qp->pd->usecnt);
+}
+EXPORT_SYMBOL(ib_qp_usecnt_dec);
+
struct ib_qp *ib_create_qp_kernel(struct ib_pd *pd,
struct ib_qp_init_attr *qp_init_attr,
const char *caller)
@@ -1306,14 +1336,7 @@ struct ib_qp *ib_create_qp_kernel(struct ib_pd *pd,
return xrc_qp;
}

- if (qp_init_attr->recv_cq)
- atomic_inc(&qp_init_attr->recv_cq->usecnt);
- if (qp->srq)
- atomic_inc(&qp_init_attr->srq->usecnt);
-
- atomic_inc(&pd->usecnt);
- if (qp_init_attr->send_cq)
- atomic_inc(&qp_init_attr->send_cq->usecnt);
+ ib_qp_usecnt_inc(qp);

if (qp_init_attr->cap.max_rdma_ctxs) {
ret = rdma_rw_init_mrs(qp, qp_init_attr);
@@ -1971,10 +1994,6 @@ int ib_destroy_qp_user(struct ib_qp *qp, struct ib_udata *udata)
{
const struct ib_gid_attr *alt_path_sgid_attr = qp->alt_path_sgid_attr;
const struct ib_gid_attr *av_sgid_attr = qp->av_sgid_attr;
- struct ib_pd *pd;
- struct ib_cq *scq, *rcq;
- struct ib_srq *srq;
- struct ib_rwq_ind_table *ind_tbl;
struct ib_qp_security *sec;
int ret;

@@ -1986,11 +2005,6 @@ int ib_destroy_qp_user(struct ib_qp *qp, struct ib_udata *udata)
if (qp->real_qp != qp)
return __ib_destroy_shared_qp(qp);

- pd = qp->pd;
- scq = qp->send_cq;
- rcq = qp->recv_cq;
- srq = qp->srq;
- ind_tbl = qp->rwq_ind_tbl;
sec = qp->qp_sec;
if (sec)
ib_destroy_qp_security_begin(sec);
@@ -2010,16 +2024,8 @@ int ib_destroy_qp_user(struct ib_qp *qp, struct ib_udata *udata)
rdma_put_gid_attr(alt_path_sgid_attr);
if (av_sgid_attr)
rdma_put_gid_attr(av_sgid_attr);
- if (pd)
- atomic_dec(&pd->usecnt);
- if (scq)
- atomic_dec(&scq->usecnt);
- if (rcq)
- atomic_dec(&rcq->usecnt);
- if (srq)
- atomic_dec(&srq->usecnt);
- if (ind_tbl)
- atomic_dec(&ind_tbl->usecnt);
+
+ ib_qp_usecnt_dec(qp);
if (sec)
ib_destroy_qp_security_end(sec);

--
2.31.1