From e27535b9c6e071d461be33b75a33047c9bb4c0ce Mon Sep 17 00:00:00 2001 From: Eli Cohen Date: Wed, 17 Nov 2010 13:39:43 +0000 Subject: [PATCH] IB/mlx4: Fix memory ordering of VLAN insertion control bits We must fully update the control segment before marking it as valid, so that hardware doesn't start executing it before we're ready. Signed-off-by: Eli Cohen [ Move VLAN control bit setting to before wmb(). - Roland ] Signed-off-by: Roland Dreier --- drivers/infiniband/hw/mlx4/qp.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c index 9a7794ac34c1..2001f20a4361 100644 --- a/drivers/infiniband/hw/mlx4/qp.c +++ b/drivers/infiniband/hw/mlx4/qp.c @@ -1816,6 +1816,11 @@ int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr, ctrl->fence_size = (wr->send_flags & IB_SEND_FENCE ? MLX4_WQE_CTRL_FENCE : 0) | size; + if (be16_to_cpu(vlan) < 0x1000) { + ctrl->ins_vlan = 1 << 6; + ctrl->vlan_tag = vlan; + } + /* * Make sure descriptor is fully written before * setting ownership bit (because HW can start @@ -1831,11 +1836,6 @@ int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr, ctrl->owner_opcode = mlx4_ib_opcode[wr->opcode] | (ind & qp->sq.wqe_cnt ? cpu_to_be32(1 << 31) : 0) | blh; - if (be16_to_cpu(vlan) < 0x1000) { - ctrl->ins_vlan = 1 << 6; - ctrl->vlan_tag = vlan; - } - stamp = ind + qp->sq_spare_wqes; ind += DIV_ROUND_UP(size * 16, 1U << qp->sq.wqe_shift); -- 2.20.1