From d34ac5cd3a73aacd11009c4fc3ba15d7ea62c411 Mon Sep 17 00:00:00 2001 From: Bart Van Assche Date: Wed, 18 Jul 2018 09:25:32 -0700 Subject: RDMA, core and ULPs: Declare ib_post_send() and ib_post_recv() arguments const Since neither ib_post_send() nor ib_post_recv() modify the data structure their second argument points at, declare that argument const. This change makes it necessary to declare the 'bad_wr' argument const too and also to modify all ULPs that call ib_post_send(), ib_post_recv() or ib_post_srq_recv(). This patch does not change any functionality but makes it possible for the compiler to verify whether the ib_post_(send|recv|srq_recv) really do not modify the posted work request. To make this possible, only one cast had to be introduce that casts away constness, namely in rpcrdma_post_recvs(). The only way I can think of to avoid that cast is to introduce an additional loop in that function or to change the data type of bad_wr from struct ib_recv_wr ** into int (an index that refers to an element in the work request list). However, both approaches would require even more extensive changes than this patch. Signed-off-by: Bart Van Assche Reviewed-by: Chuck Lever Signed-off-by: Jason Gunthorpe --- drivers/infiniband/hw/mlx4/mad.c | 7 ++++--- drivers/infiniband/hw/mlx4/mlx4_ib.h | 12 ++++++------ drivers/infiniband/hw/mlx4/qp.c | 21 +++++++++++---------- drivers/infiniband/hw/mlx4/srq.c | 4 ++-- 4 files changed, 23 insertions(+), 21 deletions(-) (limited to 'drivers/infiniband/hw/mlx4') diff --git a/drivers/infiniband/hw/mlx4/mad.c b/drivers/infiniband/hw/mlx4/mad.c index 8d730a69793d..e5466d786bb1 100644 --- a/drivers/infiniband/hw/mlx4/mad.c +++ b/drivers/infiniband/hw/mlx4/mad.c @@ -506,7 +506,7 @@ int mlx4_ib_send_to_slave(struct mlx4_ib_dev *dev, int slave, u8 port, { struct ib_sge list; struct ib_ud_wr wr; - struct ib_send_wr *bad_wr; + const struct ib_send_wr *bad_wr; struct mlx4_ib_demux_pv_ctx *tun_ctx; struct mlx4_ib_demux_pv_qp *tun_qp; struct mlx4_rcv_tunnel_mad *tun_mad; @@ -1310,7 +1310,8 @@ static int mlx4_ib_post_pv_qp_buf(struct mlx4_ib_demux_pv_ctx *ctx, int index) { struct ib_sge sg_list; - struct ib_recv_wr recv_wr, *bad_recv_wr; + struct ib_recv_wr recv_wr; + const struct ib_recv_wr *bad_recv_wr; int size; size = (tun_qp->qp->qp_type == IB_QPT_UD) ? @@ -1361,7 +1362,7 @@ int mlx4_ib_send_to_wire(struct mlx4_ib_dev *dev, int slave, u8 port, { struct ib_sge list; struct ib_ud_wr wr; - struct ib_send_wr *bad_wr; + const struct ib_send_wr *bad_wr; struct mlx4_ib_demux_pv_ctx *sqp_ctx; struct mlx4_ib_demux_pv_qp *sqp; struct mlx4_mad_snd_buf *sqp_mad; diff --git a/drivers/infiniband/hw/mlx4/mlx4_ib.h b/drivers/infiniband/hw/mlx4/mlx4_ib.h index 1a0fad30633b..e817a2f55546 100644 --- a/drivers/infiniband/hw/mlx4/mlx4_ib.h +++ b/drivers/infiniband/hw/mlx4/mlx4_ib.h @@ -775,8 +775,8 @@ int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr, int mlx4_ib_query_srq(struct ib_srq *srq, struct ib_srq_attr *srq_attr); int mlx4_ib_destroy_srq(struct ib_srq *srq); void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index); -int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr, - struct ib_recv_wr **bad_wr); +int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr, + const struct ib_recv_wr **bad_wr); struct ib_qp *mlx4_ib_create_qp(struct ib_pd *pd, struct ib_qp_init_attr *init_attr, @@ -788,10 +788,10 @@ int mlx4_ib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, int attr_mask, struct ib_udata *udata); int mlx4_ib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *qp_attr, int qp_attr_mask, struct ib_qp_init_attr *qp_init_attr); -int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr, - struct ib_send_wr **bad_wr); -int mlx4_ib_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr, - struct ib_recv_wr **bad_wr); +int mlx4_ib_post_send(struct ib_qp *ibqp, const struct ib_send_wr *wr, + const struct ib_send_wr **bad_wr); +int mlx4_ib_post_recv(struct ib_qp *ibqp, const struct ib_recv_wr *wr, + const struct ib_recv_wr **bad_wr); int mlx4_MAD_IFC(struct mlx4_ib_dev *dev, int mad_ifc_flags, int port, const struct ib_wc *in_wc, const struct ib_grh *in_grh, diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c index 44fc684b5e3a..b431757d4668 100644 --- a/drivers/infiniband/hw/mlx4/qp.c +++ b/drivers/infiniband/hw/mlx4/qp.c @@ -3569,8 +3569,8 @@ static void add_zero_len_inline(void *wqe) inl->byte_count = cpu_to_be32(1 << 31); } -static int _mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr, - struct ib_send_wr **bad_wr, bool drain) +static int _mlx4_ib_post_send(struct ib_qp *ibqp, const struct ib_send_wr *wr, + const struct ib_send_wr **bad_wr, bool drain) { struct mlx4_ib_qp *qp = to_mqp(ibqp); void *wqe; @@ -3901,14 +3901,14 @@ out: return err; } -int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr, - struct ib_send_wr **bad_wr) +int mlx4_ib_post_send(struct ib_qp *ibqp, const struct ib_send_wr *wr, + const struct ib_send_wr **bad_wr) { return _mlx4_ib_post_send(ibqp, wr, bad_wr, false); } -static int _mlx4_ib_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr, - struct ib_recv_wr **bad_wr, bool drain) +static int _mlx4_ib_post_recv(struct ib_qp *ibqp, const struct ib_recv_wr *wr, + const struct ib_recv_wr **bad_wr, bool drain) { struct mlx4_ib_qp *qp = to_mqp(ibqp); struct mlx4_wqe_data_seg *scat; @@ -3995,8 +3995,8 @@ out: return err; } -int mlx4_ib_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr, - struct ib_recv_wr **bad_wr) +int mlx4_ib_post_recv(struct ib_qp *ibqp, const struct ib_recv_wr *wr, + const struct ib_recv_wr **bad_wr) { return _mlx4_ib_post_recv(ibqp, wr, bad_wr, false); } @@ -4536,7 +4536,7 @@ void mlx4_ib_drain_sq(struct ib_qp *qp) struct ib_cq *cq = qp->send_cq; struct ib_qp_attr attr = { .qp_state = IB_QPS_ERR }; struct mlx4_ib_drain_cqe sdrain; - struct ib_send_wr *bad_swr; + const struct ib_send_wr *bad_swr; struct ib_rdma_wr swr = { .wr = { .next = NULL, @@ -4571,7 +4571,8 @@ void mlx4_ib_drain_rq(struct ib_qp *qp) struct ib_cq *cq = qp->recv_cq; struct ib_qp_attr attr = { .qp_state = IB_QPS_ERR }; struct mlx4_ib_drain_cqe rdrain; - struct ib_recv_wr rwr = {}, *bad_rwr; + struct ib_recv_wr rwr = {}; + const struct ib_recv_wr *bad_rwr; int ret; struct mlx4_ib_dev *dev = to_mdev(qp->device); struct mlx4_dev *mdev = dev->dev; diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c index ebee56cbc0e2..3731b31c3653 100644 --- a/drivers/infiniband/hw/mlx4/srq.c +++ b/drivers/infiniband/hw/mlx4/srq.c @@ -307,8 +307,8 @@ void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index) spin_unlock(&srq->lock); } -int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr, - struct ib_recv_wr **bad_wr) +int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr, + const struct ib_recv_wr **bad_wr) { struct mlx4_ib_srq *srq = to_msrq(ibsrq); struct mlx4_wqe_srq_next_seg *next; -- cgit v1.2.3-59-g8ed1b