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authorEli Cohen <eli@dev.mellanox.co.il>2010-11-17 13:39:43 +0000
committerRoland Dreier <rolandd@cisco.com>2010-12-01 11:08:54 -0800
commite27535b9c6e071d461be33b75a33047c9bb4c0ce (patch)
tree85175ba81cbd99a2e797a298eace5f084223b4bd /drivers/infiniband
parentc48c43e422c1404fd72c57d1d21a6f6d01e18900 (diff)
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 <eli@mellanox.co.il> [ Move VLAN control bit setting to before wmb(). - Roland ] Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband')
-rw-r--r--drivers/infiniband/hw/mlx4/qp.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index 9a7794ac34c..2001f20a436 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);