netdev - [net-next 01/15] net/mlx5e: Suppress Send WQEBB room warning for PAGE

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Date:   Wed, 18 Jan 2023 10:35:48 -0800
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>,
        Rahul Rameshbabu <rrameshbabu@...dia.com>,
        kernel test robot <lkp@...el.com>
Subject: [net-next 01/15] net/mlx5e: Suppress Send WQEBB room warning for PAGE_SIZE >= 16KB

From: Rahul Rameshbabu <rrameshbabu@...dia.com>

Send WQEBB size is 64 bytes and the max number of WQEBBs for an SQ is 255.
For 16KB pages and greater, there is always sufficient spaces for all
WQEBBs of an SQ. Cast mlx5e_get_max_sq_wqebbs(mdev) to u16. Prevents
-Wtautological-constant-out-of-range-compare warnings from occurring when
PAGE_SIZE >= 16KB.

Signed-off-by: Rahul Rameshbabu <rrameshbabu@...dia.com>
Reported-by: kernel test robot <lkp@...el.com>
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h b/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
index 853f312cd757..5578f92f7e0f 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
@@ -445,7 +445,7 @@ mlx5e_set_eseg_swp(struct sk_buff *skb, struct mlx5_wqe_eth_seg *eseg,
 
 static inline u16 mlx5e_stop_room_for_wqe(struct mlx5_core_dev *mdev, u16 wqe_size)
 {
-	WARN_ON_ONCE(PAGE_SIZE / MLX5_SEND_WQE_BB < mlx5e_get_max_sq_wqebbs(mdev));
+	WARN_ON_ONCE(PAGE_SIZE / MLX5_SEND_WQE_BB < (u16)mlx5e_get_max_sq_wqebbs(mdev));
 
 	/* A WQE must not cross the page boundary, hence two conditions:
 	 * 1. Its size must not exceed the page size.
-- 
2.39.0