[PATCH rdma-rc] RDMA/mlx5: Set user priority for DCT

[PATCH rdma-rc] RDMA/mlx5: Set user priority for DCT

[Leon Romanovsky]

From: Patrisious Haddad <phaddad@nvidia.com>

Currently, the driver doesn't set the PCP-based priority for DCT,
hence DCT response packets are transmitted without user priority.

Fix it by setting user provided priority in the eth_prio field
in the DCT context, which in turn sets the value in the transmitted packet.

Fixes: 776a3906b692 ("IB/mlx5: Add support for DC target QP")
Signed-off-by: Patrisious Haddad <phaddad@nvidia.com>
Reviewed-by: Maor Gottlieb <maorg@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
 drivers/infiniband/hw/mlx5/qp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/infiniband/hw/mlx5/qp.c b/drivers/infiniband/hw/mlx5/qp.c
index b2fca110346c..e5abbcfc1d57 100644
--- a/drivers/infiniband/hw/mlx5/qp.c
+++ b/drivers/infiniband/hw/mlx5/qp.c
@@ -4458,6 +4458,8 @@ static int mlx5_ib_modify_dct(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 		MLX5_SET(dctc, dctc, mtu, attr->path_mtu);
 		MLX5_SET(dctc, dctc, my_addr_index, attr->ah_attr.grh.sgid_index);
 		MLX5_SET(dctc, dctc, hop_limit, attr->ah_attr.grh.hop_limit);
+		if (attr->ah_attr.type == RDMA_AH_ATTR_TYPE_ROCE)
+			MLX5_SET(dctc, dctc, eth_prio, attr->ah_attr.sl & 0x7);
 
 		err = mlx5_core_create_dct(dev, &qp->dct.mdct, qp->dct.in,
 					   MLX5_ST_SZ_BYTES(create_dct_in), out,
-- 
2.31.1

Re: [PATCH rdma-rc] RDMA/mlx5: Set user priority for DCT

[Jason Gunthorpe]

On Wed, Oct 06, 2021 at 12:31:53PM +0300, Leon Romanovsky wrote:
> From: Patrisious Haddad <phaddad@nvidia.com>
> 
> Currently, the driver doesn't set the PCP-based priority for DCT,
> hence DCT response packets are transmitted without user priority.
> 
> Fix it by setting user provided priority in the eth_prio field
> in the DCT context, which in turn sets the value in the transmitted packet.
> 
> Fixes: 776a3906b692 ("IB/mlx5: Add support for DC target QP")
> Signed-off-by: Patrisious Haddad <phaddad@nvidia.com>
> Reviewed-by: Maor Gottlieb <maorg@nvidia.com>
> Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
> ---
>  drivers/infiniband/hw/mlx5/qp.c | 2 ++
>  1 file changed, 2 insertions(+)

Applied to for-rc, thanks

Jason