netdev - [net-next 02/16] net/mlx5e: Convert mlx5e_get_max_sq

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Message-Id: <20220927203611.244301-3-saeed@kernel.org>
Date:   Tue, 27 Sep 2022 13:35:57 -0700
From:   Saeed Mahameed <saeed@...nel.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org,
        Tariq Toukan <tariqt@...dia.com>,
        Maxim Mikityanskiy <maximmi@...dia.com>
Subject: [net-next 02/16] net/mlx5e: Convert mlx5e_get_max_sq_wqebbs to u8

From: Maxim Mikityanskiy <maximmi@...dia.com>

The return value of mlx5e_get_max_sq_wqebbs is clamped down to
MLX5_SEND_WQE_MAX_WQEBBS = 16, which fits into u8. This commit changes
the return type of this function to u8 for stricter type safety.

Signed-off-by: Maxim Mikityanskiy <maximmi@...dia.com>
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
Reviewed-by: Saeed Mahameed <saeedm@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en.h | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index 648a178e8db8..05126c6ae13d 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -227,10 +227,12 @@ static inline int mlx5e_get_max_num_channels(struct mlx5_core_dev *mdev)
  * bytes units. Driver hardens the limitation to 1KB (16
  * WQEBBs), unless firmware capability is stricter.
  */
-static inline u16 mlx5e_get_max_sq_wqebbs(struct mlx5_core_dev *mdev)
+static inline u8 mlx5e_get_max_sq_wqebbs(struct mlx5_core_dev *mdev)
 {
-	return min_t(u16, MLX5_SEND_WQE_MAX_WQEBBS,
-		     MLX5_CAP_GEN(mdev, max_wqe_sz_sq) / MLX5_SEND_WQE_BB);
+	BUILD_BUG_ON(MLX5_SEND_WQE_MAX_WQEBBS > U8_MAX);
+
+	return (u8)min_t(u16, MLX5_SEND_WQE_MAX_WQEBBS,
+			 MLX5_CAP_GEN(mdev, max_wqe_sz_sq) / MLX5_SEND_WQE_BB);
 }
 
 static inline u8 mlx5e_get_sw_max_sq_mpw_wqebbs(u8 max_sq_wqebbs)
-- 
2.37.3