On Wed, Jul 04, 2018 at 01:09:37PM -0600, Jason Gunthorpe wrote:
> On Tue, Jun 19, 2018 at 08:47:24AM +0300, Leon Romanovsky wrote:
> > From: Yonatan Cohen <yonat...@mellanox.com>
> >
> > MLX5 IB HCA offers the memory key, dump_fill_mkey to boost
> > performance, when used in a send or receive operations.
> >
> > It is used to force local HCA operations to skip the PCI bus access,
> > while keeping track of the processed length in the ibv_sge handling.
> >
> > Meaning, instead of a PCI write access the HCA leaves the target
> > memory untouched, and skips filling that packet section. Similar
> > behavior is done upon send, the HCA skips data in memory relevant
> > to this key and saves PCI bus access.
> >
> > This functionality saves PCI read/write operations.
> >
> > Signed-off-by: Yonatan Cohen <yonat...@mellanox.com>
> > Reviewed-by: Yishai Hadas <yish...@mellanox.com>
> > Reviewed-by: Guy Levi <gu...@mellanox.com>
> > Signed-off-by: Leon Romanovsky <leo...@mellanox.com>
> > drivers/infiniband/hw/mlx5/main.c | 16 +++++++++++++++-
> > include/uapi/rdma/mlx5-abi.h | 3 ++-
> > 2 files changed, 17 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/infiniband/hw/mlx5/main.c
> > b/drivers/infiniband/hw/mlx5/main.c
> > index c29c7c838980..97113957398d 100644
> > +++ b/drivers/infiniband/hw/mlx5/main.c
> > @@ -1634,6 +1634,7 @@ static struct ib_ucontext
> > *mlx5_ib_alloc_ucontext(struct ib_device *ibdev,
> > int err;
> > size_t min_req_v2 = offsetof(struct mlx5_ib_alloc_ucontext_req_v2,
> > max_cqe_version);
> > + u32 dump_fill_mkey;
> > bool lib_uar_4k;
> >
> > if (!dev->ib_active)
> > @@ -1743,8 +1744,12 @@ static struct ib_ucontext
> > *mlx5_ib_alloc_ucontext(struct ib_device *ibdev,
> > }
> >
> > err = mlx5_ib_devx_create(dev, context);
> > + }
> > +
> > + if (MLX5_CAP_GEN(dev->mdev, dump_fill_mkey)) {
> > + err = mlx5_cmd_dump_fill_mkey(dev->mdev, &dump_fill_mkey);
> > if (err)
> > - goto out_td;
> > + goto out_mdev;
> > }
>
> Dropping the if (err) after mlx5_ib_devx_create is a rebasing error,
> right?
Sorry, you are right, the fixup is pretty straightforward.
diff --git a/drivers/infiniband/hw/mlx5/main.c
b/drivers/infiniband/hw/mlx5/main.c
index 2bbafee6976c..71f3e9677622 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -1739,6 +1739,8 @@ static struct ib_ucontext
*mlx5_ib_alloc_ucontext(struct ib_device *ibdev,
}
err = mlx5_ib_devx_create(dev, context);
if (err)
+ goto out_td;
}
if (MLX5_CAP_GEN(dev->mdev, dump_fill_mkey)) {
>
> Jason
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