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Message-ID: <1752471585-18053-5-git-send-email-tariqt@nvidia.com>
Date: Mon, 14 Jul 2025 08:39:43 +0300
From: Tariq Toukan <tariqt@...dia.com>
To: Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew+netdev@...n.ch>, "David
S. Miller" <davem@...emloft.net>
CC: Saeed Mahameed <saeed@...nel.org>, Gal Pressman <gal@...dia.com>, "Leon
Romanovsky" <leon@...nel.org>, Saeed Mahameed <saeedm@...dia.com>, "Tariq
Toukan" <tariqt@...dia.com>, Mark Bloch <mbloch@...dia.com>,
<netdev@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, Lama Kayal <lkayal@...dia.com>
Subject: [PATCH net-next 4/6] net/mlx5e: SHAMPO, Cleanup reservation size formula
From: Lama Kayal <lkayal@...dia.com>
The reservation size formula can be reduced to a simple evaluation of
MLX5E_SHAMPO_WQ_RESRV_SIZE. This leaves mlx5e_shampo_get_log_rsrv_size()
with one single use, which can be replaced with a macro for simplicity.
Also, function mlx5e_shampo_get_log_rsrv_size() is used only throughout
params.c, make it static.
Signed-off-by: Lama Kayal <lkayal@...dia.com>
Reviewed-by: Dragos Tatulea <dtatulea@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
---
drivers/net/ethernet/mellanox/mlx5/core/en.h | 5 +--
.../ethernet/mellanox/mlx5/core/en/params.c | 34 +++++++------------
.../ethernet/mellanox/mlx5/core/en/params.h | 4 ---
3 files changed, 15 insertions(+), 28 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index 64e69e616b1f..019bc6ca4455 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -85,8 +85,9 @@ struct page_pool;
#define MLX5E_SHAMPO_WQ_HEADER_PER_PAGE (PAGE_SIZE >> MLX5E_SHAMPO_LOG_MAX_HEADER_ENTRY_SIZE)
#define MLX5E_SHAMPO_LOG_WQ_HEADER_PER_PAGE (PAGE_SHIFT - MLX5E_SHAMPO_LOG_MAX_HEADER_ENTRY_SIZE)
#define MLX5E_SHAMPO_WQ_BASE_HEAD_ENTRY_SIZE (64)
-#define MLX5E_SHAMPO_WQ_RESRV_SIZE (64 * 1024)
-#define MLX5E_SHAMPO_WQ_BASE_RESRV_SIZE (4096)
+#define MLX5E_SHAMPO_WQ_RESRV_SIZE_BASE_SHIFT (12)
+#define MLX5E_SHAMPO_WQ_LOG_RESRV_SIZE (16)
+#define MLX5E_SHAMPO_WQ_RESRV_SIZE BIT(MLX5E_SHAMPO_WQ_LOG_RESRV_SIZE)
#define MLX5_MPWRQ_MIN_LOG_STRIDE_SZ(mdev) \
(6 + MLX5_CAP_GEN(mdev, cache_line_128byte)) /* HW restriction */
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/params.c b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c
index fc945bce933a..616251ec6d69 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/params.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c
@@ -420,19 +420,10 @@ u8 mlx5e_shampo_get_log_hd_entry_size(struct mlx5_core_dev *mdev,
return order_base_2(DIV_ROUND_UP(MLX5E_RX_MAX_HEAD, MLX5E_SHAMPO_WQ_BASE_HEAD_ENTRY_SIZE));
}
-u8 mlx5e_shampo_get_log_rsrv_size(struct mlx5_core_dev *mdev,
- struct mlx5e_params *params)
+static u8 mlx5e_shampo_get_log_pkt_per_rsrv(struct mlx5e_params *params)
{
- return order_base_2(MLX5E_SHAMPO_WQ_RESRV_SIZE / MLX5E_SHAMPO_WQ_BASE_RESRV_SIZE);
-}
-
-u8 mlx5e_shampo_get_log_pkt_per_rsrv(struct mlx5_core_dev *mdev,
- struct mlx5e_params *params)
-{
- u32 resrv_size = BIT(mlx5e_shampo_get_log_rsrv_size(mdev, params)) *
- MLX5E_SHAMPO_WQ_BASE_RESRV_SIZE;
-
- return order_base_2(DIV_ROUND_UP(resrv_size, params->sw_mtu));
+ return order_base_2(DIV_ROUND_UP(MLX5E_SHAMPO_WQ_RESRV_SIZE,
+ params->sw_mtu));
}
u8 mlx5e_mpwqe_get_log_stride_size(struct mlx5_core_dev *mdev,
@@ -834,10 +825,9 @@ static u32 mlx5e_shampo_get_log_cq_size(struct mlx5_core_dev *mdev,
struct mlx5e_params *params,
struct mlx5e_xsk_param *xsk)
{
- int rsrv_size = BIT(mlx5e_shampo_get_log_rsrv_size(mdev, params)) *
- MLX5E_SHAMPO_WQ_BASE_RESRV_SIZE;
+ int rsrv_size = MLX5E_SHAMPO_WQ_RESRV_SIZE;
u16 num_strides = BIT(mlx5e_mpwqe_get_log_num_strides(mdev, params, xsk));
- int pkt_per_rsrv = BIT(mlx5e_shampo_get_log_pkt_per_rsrv(mdev, params));
+ int pkt_per_rsrv = BIT(mlx5e_shampo_get_log_pkt_per_rsrv(params));
u8 log_stride_sz = mlx5e_mpwqe_get_log_stride_size(mdev, params, xsk);
int wq_size = BIT(mlx5e_mpwqe_get_log_rq_size(mdev, params, xsk));
int wqe_size = BIT(log_stride_sz) * num_strides;
@@ -932,10 +922,11 @@ int mlx5e_build_rq_param(struct mlx5_core_dev *mdev,
MLX5_SET(wq, wq, shampo_enable, true);
MLX5_SET(wq, wq, log_reservation_size,
- mlx5e_shampo_get_log_rsrv_size(mdev, params));
+ MLX5E_SHAMPO_WQ_LOG_RESRV_SIZE -
+ MLX5E_SHAMPO_WQ_RESRV_SIZE_BASE_SHIFT);
MLX5_SET(wq, wq,
log_max_num_of_packets_per_reservation,
- mlx5e_shampo_get_log_pkt_per_rsrv(mdev, params));
+ mlx5e_shampo_get_log_pkt_per_rsrv(params));
MLX5_SET(wq, wq, log_headers_entry_size,
mlx5e_shampo_get_log_hd_entry_size(mdev, params));
lro_timeout =
@@ -1048,18 +1039,17 @@ u32 mlx5e_shampo_hd_per_wqe(struct mlx5_core_dev *mdev,
struct mlx5e_params *params,
struct mlx5e_rq_param *rq_param)
{
- int resv_size = BIT(mlx5e_shampo_get_log_rsrv_size(mdev, params)) *
- MLX5E_SHAMPO_WQ_BASE_RESRV_SIZE;
+ int rsrv_size = MLX5E_SHAMPO_WQ_RESRV_SIZE;
u16 num_strides = BIT(mlx5e_mpwqe_get_log_num_strides(mdev, params, NULL));
- int pkt_per_resv = BIT(mlx5e_shampo_get_log_pkt_per_rsrv(mdev, params));
+ int pkt_per_resv = BIT(mlx5e_shampo_get_log_pkt_per_rsrv(params));
u8 log_stride_sz = mlx5e_mpwqe_get_log_stride_size(mdev, params, NULL);
int wqe_size = BIT(log_stride_sz) * num_strides;
u32 hd_per_wqe;
/* Assumption: hd_per_wqe % 8 == 0. */
- hd_per_wqe = (wqe_size / resv_size) * pkt_per_resv;
+ hd_per_wqe = (wqe_size / rsrv_size) * pkt_per_resv;
mlx5_core_dbg(mdev, "%s hd_per_wqe = %d rsrv_size = %d wqe_size = %d pkt_per_resv = %d\n",
- __func__, hd_per_wqe, resv_size, wqe_size, pkt_per_resv);
+ __func__, hd_per_wqe, rsrv_size, wqe_size, pkt_per_resv);
return hd_per_wqe;
}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/params.h b/drivers/net/ethernet/mellanox/mlx5/core/en/params.h
index bd5877acc5b1..919895f64dcd 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/params.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/params.h
@@ -97,10 +97,6 @@ u8 mlx5e_mpwqe_get_log_rq_size(struct mlx5_core_dev *mdev,
struct mlx5e_xsk_param *xsk);
u8 mlx5e_shampo_get_log_hd_entry_size(struct mlx5_core_dev *mdev,
struct mlx5e_params *params);
-u8 mlx5e_shampo_get_log_rsrv_size(struct mlx5_core_dev *mdev,
- struct mlx5e_params *params);
-u8 mlx5e_shampo_get_log_pkt_per_rsrv(struct mlx5_core_dev *mdev,
- struct mlx5e_params *params);
u32 mlx5e_shampo_hd_per_wqe(struct mlx5_core_dev *mdev,
struct mlx5e_params *params,
struct mlx5e_rq_param *rq_param);
--
2.40.1
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