IB/mlx4: Add strong ordering to local inval and fast reg work requests

commit 2ac6bf4ddc87c3b6b609f8fa82f6ebbffeac12f4 upstream.

The ConnectX Programmer's Reference Manual states that the "SO" bit
must be set when posting Fast Register and Local Invalidate send work
requests.  When this bit is set, the work request will be executed
only after all previous work requests on the send queue have been
executed.  (If the bit is not set, Fast Register and Local Invalidate
WQEs may begin execution too early, which violates the defined
semantics for these operations)

This fixes the issue with NFS/RDMA reported in
<http://lists.openfabrics.org/pipermail/general/2009-April/059253.html>

Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index 9559248..8c844a1 100644 (file)
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -1563,12 +1563,16 @@ int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
                                break;
 
                        case IB_WR_LOCAL_INV:
+                               ctrl->srcrb_flags |=
+                                       cpu_to_be32(MLX4_WQE_CTRL_STRONG_ORDER);
                                set_local_inv_seg(wqe, wr->ex.invalidate_rkey);
                                wqe  += sizeof (struct mlx4_wqe_local_inval_seg);
                                size += sizeof (struct mlx4_wqe_local_inval_seg) / 16;
                                break;
 
                        case IB_WR_FAST_REG_MR:
+                               ctrl->srcrb_flags |=
+                                       cpu_to_be32(MLX4_WQE_CTRL_STRONG_ORDER);
                                set_fmr_seg(wqe, wr);
                                wqe  += sizeof (struct mlx4_wqe_fmr_seg);
                                size += sizeof (struct mlx4_wqe_fmr_seg) / 16;

diff --git a/include/linux/mlx4/qp.h b/include/linux/mlx4/qp.h
index bf8f119..9f29d86 100644 (file)
--- a/include/linux/mlx4/qp.h
+++ b/include/linux/mlx4/qp.h
@@ -165,6 +165,7 @@ enum {
        MLX4_WQE_CTRL_IP_CSUM           = 1 << 4,
        MLX4_WQE_CTRL_TCP_UDP_CSUM      = 1 << 5,
        MLX4_WQE_CTRL_INS_VLAN          = 1 << 6,
+       MLX4_WQE_CTRL_STRONG_ORDER      = 1 << 7,
 };
 
 struct mlx4_wqe_ctrl_seg {