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Date:   Tue, 27 Sep 2022 13:36:04 -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 09/16] net/mlx5e: Use the aligned max TX MPWQE size

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

TX MPWQE size is limited to the cacheline-aligned maximum. Use the same
value for the stop room and the capability check.

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/params.c | 8 ++++----
 drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h   | 7 +++++++
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c   | 5 +++--
 3 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/params.c b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c
index 2be09cc3c437..2c8fe2e60e17 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/params.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/params.c
@@ -209,11 +209,11 @@ u16 mlx5e_calc_sq_stop_room(struct mlx5_core_dev *mdev, struct mlx5e_params *par
 	stop_room  = mlx5e_ktls_get_stop_room(mdev, params);
 	stop_room += mlx5e_stop_room_for_max_wqe(mdev);
 	if (is_mpwqe)
-		/* A MPWQE can take up to the maximum-sized WQE + all the normal
-		 * stop room can be taken if a new packet breaks the active
-		 * MPWQE session and allocates its WQEs right away.
+		/* A MPWQE can take up to the maximum cacheline-aligned WQE +
+		 * all the normal stop room can be taken if a new packet breaks
+		 * the active MPWQE session and allocates its WQEs right away.
 		 */
-		stop_room += mlx5e_stop_room_for_max_wqe(mdev);
+		stop_room += mlx5e_stop_room_for_mpwqe(mdev);
 
 	return stop_room;
 }
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h b/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
index c208ea307bff..8751e48e283d 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
@@ -439,6 +439,13 @@ static inline u16 mlx5e_stop_room_for_max_wqe(struct mlx5_core_dev *mdev)
 	return MLX5E_STOP_ROOM(mlx5e_get_max_sq_wqebbs(mdev));
 }
 
+static inline u16 mlx5e_stop_room_for_mpwqe(struct mlx5_core_dev *mdev)
+{
+	u8 mpwqe_wqebbs = mlx5e_get_max_sq_aligned_wqebbs(mdev);
+
+	return mlx5e_stop_room_for_wqe(mdev, mpwqe_wqebbs);
+}
+
 static inline bool mlx5e_icosq_can_post_wqe(struct mlx5e_icosq *sq, u16 wqe_size)
 {
 	u16 room = sq->reserved_room;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index e7fea19ac523..a3013d5190d1 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -75,7 +75,7 @@ bool mlx5e_check_fragmented_striding_rq_cap(struct mlx5_core_dev *mdev)
 
 	striding_rq_umr = MLX5_CAP_GEN(mdev, striding_rq) && MLX5_CAP_GEN(mdev, umr_ptr_rlky) &&
 			  MLX5_CAP_ETH(mdev, reg_umr_sq);
-	max_wqe_sz_cap = mlx5e_get_max_sq_wqebbs(mdev) * MLX5_SEND_WQE_BB;
+	max_wqe_sz_cap = mlx5e_get_max_sq_aligned_wqebbs(mdev) * MLX5_SEND_WQE_BB;
 	inline_umr = max_wqe_sz_cap >= MLX5E_UMR_WQE_INLINE_SZ;
 	if (!striding_rq_umr)
 		return false;
@@ -1155,7 +1155,8 @@ static int mlx5e_alloc_xdpsq(struct mlx5e_channel *c,
 		is_redirect ?
 			&c->priv->channel_stats[c->ix]->xdpsq :
 			&c->priv->channel_stats[c->ix]->rq_xdpsq;
-	sq->stop_room = mlx5e_stop_room_for_max_wqe(mdev);
+	sq->stop_room = param->is_mpw ? mlx5e_stop_room_for_mpwqe(mdev) :
+					mlx5e_stop_room_for_max_wqe(mdev);
 	sq->max_sq_mpw_wqebbs = mlx5e_get_max_sq_aligned_wqebbs(mdev);
 
 	param->wq.db_numa_node = cpu_to_node(c->cpu);
-- 
2.37.3

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