Move fields that are not read/written in fast path to a different
struct / cacheline in the RQ structure.

Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en.h      |  4 +++-
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 12 +++++++-----
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index c7ac6ebe8290..d90be82a9019 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -676,7 +676,6 @@ struct mlx5e_rq {
 			struct mlx5e_umr_wqe_hdr umr_wqe;
 			struct mlx5e_mpw_info *info;
 			mlx5e_fp_skb_from_cqe_mpwrq skb_from_cqe_mpwrq;
-			__be32                 umr_mkey_be;
 			u16                    num_strides;
 			u16                    actual_wq_head;
 			u8                     log_stride_sz;
@@ -745,6 +744,9 @@ struct mlx5e_rq {
 	struct mlx5_core_dev  *mdev;
 	struct mlx5e_channel  *channel;
 	struct mlx5e_dma_info  wqe_overflow;
+	struct {
+		__be32 umr_mkey_be;
+	} mpwqe_sp;
 
 	/* XDP read-mostly */
 	struct xdp_rxq_info    xdp_rxq;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index f7009da94f0b..20c24d829ee2 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -332,7 +332,7 @@ static inline void mlx5e_build_umr_wqe(struct mlx5e_rq *rq,
 
 	cseg->qpn_ds    = cpu_to_be32((sq->sqn << MLX5_WQE_CTRL_QPN_SHIFT) |
 				      ds_cnt);
-	cseg->umr_mkey  = rq->mpwqe.umr_mkey_be;
+	cseg->umr_mkey  = rq->mpwqe_sp.umr_mkey_be;
 
 	ucseg->flags = MLX5_UMR_TRANSLATION_OFFSET_EN | MLX5_UMR_INLINE;
 	octowords = mlx5e_mpwrq_umr_octowords(rq->mpwqe.pages_per_wqe, rq->mpwqe.umr_mode);
@@ -513,7 +513,7 @@ static int mlx5e_create_rq_umr_mkey(struct mlx5_core_dev *mdev, struct mlx5e_rq
 	err = mlx5e_create_umr_mkey(mdev, num_entries, rq->mpwqe.page_shift,
 				    &umr_mkey, rq->wqe_overflow.addr,
 				    rq->mpwqe.umr_mode, xsk_chunk_size);
-	rq->mpwqe.umr_mkey_be = cpu_to_be32(umr_mkey);
+	rq->mpwqe_sp.umr_mkey_be = cpu_to_be32(umr_mkey);
 	return err;
 }
 
@@ -1024,7 +1024,7 @@ static int mlx5e_alloc_rq(struct mlx5e_params *params,
 
 			wqe->data[0].addr = cpu_to_be64(dma_offset + headroom);
 			wqe->data[0].byte_count = cpu_to_be32(byte_count);
-			wqe->data[0].lkey = rq->mpwqe.umr_mkey_be;
+			wqe->data[0].lkey = rq->mpwqe_sp.umr_mkey_be;
 		} else {
 			struct mlx5e_rx_wqe_cyc *wqe =
 				mlx5_wq_cyc_get_wqe(&rq->wqe.wq, i);
@@ -1057,7 +1057,8 @@ static int mlx5e_alloc_rq(struct mlx5e_params *params,
 err_free_mpwqe_info:
 		kvfree(rq->mpwqe.info);
 err_rq_mkey:
-		mlx5_core_destroy_mkey(mdev, be32_to_cpu(rq->mpwqe.umr_mkey_be));
+		mlx5_core_destroy_mkey(mdev,
+				       be32_to_cpu(rq->mpwqe_sp.umr_mkey_be));
 err_rq_drop_page:
 		mlx5e_free_mpwqe_rq_drop_page(rq);
 		break;
@@ -1082,7 +1083,8 @@ static void mlx5e_free_rq(struct mlx5e_rq *rq)
 	case MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ:
 		mlx5e_rq_free_shampo(rq);
 		kvfree(rq->mpwqe.info);
-		mlx5_core_destroy_mkey(rq->mdev, be32_to_cpu(rq->mpwqe.umr_mkey_be));
+		mlx5_core_destroy_mkey(rq->mdev,
+				       be32_to_cpu(rq->mpwqe_sp.umr_mkey_be));
 		mlx5e_free_mpwqe_rq_drop_page(rq);
 		break;
 	default: /* MLX5_WQ_TYPE_CYCLIC */
-- 
2.44.0

On Thu, Mar 19, 2026 at 09:43:36AM +0200, Tariq Toukan wrote:
> Move fields that are not read/written in fast path to a different
> struct / cacheline in the RQ structure.
> 
> Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
> Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com>
> ---
>  drivers/net/ethernet/mellanox/mlx5/core/en.h      |  4 +++-
>  drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 12 +++++++-----
>  2 files changed, 10 insertions(+), 6 deletions(-)

Reviewed-by: Joe Damato <joe@dama.to>