netdev - [PATCH net-next 5/7] net/mlx5e: Do not re-apply TIR loopback configuration if not necessary

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Message-ID: <1761201820-923638-6-git-send-email-tariqt@nvidia.com>
Date: Thu, 23 Oct 2025 09:43:38 +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 <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>,
	Tariq Toukan <tariqt@...dia.com>, Mark Bloch <mbloch@...dia.com>,
	<netdev@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Gal Pressman <gal@...dia.com>, "Carolina
 Jubran" <cjubran@...dia.com>, Dragos Tatulea <dtatulea@...dia.com>
Subject: [PATCH net-next 5/7] net/mlx5e: Do not re-apply TIR loopback configuration if not necessary

On old firmware, (tis_tir_td_order=0), TIR of a transport domain should
either be created after all SQs of the same domain, or TIR.self_lb_en
should be reapplied using MODIFY_TIR, for self loopback filtering to
function correctly.

This is not necessary anymnore on new FW (tis_tir_td_order=1), thus
there's no need for calling modify_tir operations after creating a new
set of SQs to maintain the self loopback prevention functional.

Skip these operations.

This saves O(max_num_channels) MODIFY_TIR firmware commands in
operations like interface up or channels configuration change.

Signed-off-by: Tariq Toukan <tariqt@...dia.com>
Reviewed-by: Carolina Jubran <cjubran@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_common.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_common.c b/drivers/net/ethernet/mellanox/mlx5/core/en_common.c
index fad6b761f622..1d663c9597a3 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_common.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_common.c
@@ -282,5 +282,8 @@ int mlx5e_modify_tirs_lb(struct mlx5_core_dev *mdev, bool enable_uc_lb,
 int mlx5e_refresh_tirs(struct mlx5_core_dev *mdev, bool enable_uc_lb,
 		       bool enable_mc_lb)
 {
+	if (MLX5_CAP_GEN(mdev, tis_tir_td_order))
+		return 0; /* refresh not needed */
+
 	return mlx5e_modify_tirs_lb(mdev, enable_uc_lb, enable_mc_lb);
 }
-- 
2.31.1