Re: [PATCH rdma-next 2/2] IB/mlx5: Enable UAR to have DevX UID

On Wed, Sep 15, 2021 at 10:47:53AM -0300, Jason Gunthorpe wrote:

On Wed, Sep 15, 2021 at 02:11:23AM +0300, Leon Romanovsky wrote:

quoted

From: Meir Lichtinger <redacted>

UID field was added to alloc_uar and dealloc_uar PRM command, to specify
DevX UID for UAR. This change enables firmware validating user access to
its own UAR resources.

For the kernel allocated UARs the UID will stay 0 as of today.

Signed-off-by: Meir Lichtinger <redacted>
Reviewed-by: Yishai Hadas <yishaih@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
 drivers/infiniband/hw/mlx5/cmd.c  | 24 ++++++++++++++
 drivers/infiniband/hw/mlx5/cmd.h  |  2 ++
 drivers/infiniband/hw/mlx5/main.c | 55 +++++++++++++++++--------------
 3 files changed, 57 insertions(+), 24 deletions(-)

diff --git a/drivers/infiniband/hw/mlx5/cmd.c b/drivers/infiniband/hw/mlx5/cmd.c
index a8db8a051170..0fe3c4ceec43 100644
+++ b/drivers/infiniband/hw/mlx5/cmd.c

@@ -206,3 +206,27 @@ int mlx5_cmd_mad_ifc(struct mlx5_core_dev *dev, const void *inb, void *outb,
 	kfree(in);
 	return err;
 }
+
+int mlx5_ib_cmd_uar_alloc(struct mlx5_core_dev *dev, u32 *uarn, u16 uid)
+{
+	u32 out[MLX5_ST_SZ_DW(alloc_uar_out)] = {};
+	u32 in[MLX5_ST_SZ_DW(alloc_uar_in)] = {};
+	int err;
+
+	MLX5_SET(alloc_uar_in, in, opcode, MLX5_CMD_OP_ALLOC_UAR);
+	MLX5_SET(alloc_uar_in, in, uid, uid);
+	err = mlx5_cmd_exec_inout(dev, alloc_uar, in, out);
+	if (!err)
+		*uarn = MLX5_GET(alloc_uar_out, out, uar);

Success oriented flow:

 if (err)
     return err;
 *uarn = MLX5_GET(alloc_uar_out, out, uar);
 return 0;

And why did we add entirely new functions instead of just adding a uid
argument to the core ones? Or, why doesn't this delete the old core
functions that look unused outside of IB anyhow?

We didn't want to add not-needed for mlx5_core uid field, the rest
comments are valid and I'm sorry that I missed them.

Thanks

Jason