linux-kernel - [PATCH AUTOSEL 6.12 422/486] net/mlx5e: Avoid WARN_ON when configuring MQPRIO with HTB offload enabled

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Message-Id: <20250505223922.2682012-422-sashal@kernel.org>
Date: Mon,  5 May 2025 18:38:18 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Carolina Jubran <cjubran@...dia.com>,
	Yael Chemla <ychemla@...dia.com>,
	Cosmin Ratiu <cratiu@...dia.com>,
	Tariq Toukan <tariqt@...dia.com>,
	Kalesh AP <kalesh-anakkur.purayil@...adcom.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Sasha Levin <sashal@...nel.org>,
	saeedm@...dia.com,
	andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	netdev@...r.kernel.org,
	linux-rdma@...r.kernel.org
Subject: [PATCH AUTOSEL 6.12 422/486] net/mlx5e: Avoid WARN_ON when configuring MQPRIO with HTB offload enabled

From: Carolina Jubran <cjubran@...dia.com>

[ Upstream commit 689805dcc474c2accb5cffbbcea1c06ee4a54570 ]

When attempting to enable MQPRIO while HTB offload is already
configured, the driver currently returns `-EINVAL` and triggers a
`WARN_ON`, leading to an unnecessary call trace.

Update the code to handle this case more gracefully by returning
`-EOPNOTSUPP` instead, while also providing a helpful user message.

Signed-off-by: Carolina Jubran <cjubran@...dia.com>
Reviewed-by: Yael Chemla <ychemla@...dia.com>
Reviewed-by: Cosmin Ratiu <cratiu@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@...adcom.com>
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 15ec9750d4be0..36a2c935267b0 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -3759,8 +3759,11 @@ static int mlx5e_setup_tc_mqprio(struct mlx5e_priv *priv,
 	/* MQPRIO is another toplevel qdisc that can't be attached
 	 * simultaneously with the offloaded HTB.
 	 */
-	if (WARN_ON(mlx5e_selq_is_htb_enabled(&priv->selq)))
-		return -EINVAL;
+	if (mlx5e_selq_is_htb_enabled(&priv->selq)) {
+		NL_SET_ERR_MSG_MOD(mqprio->extack,
+				   "MQPRIO cannot be configured when HTB offload is enabled.");
+		return -EOPNOTSUPP;
+	}
 
 	switch (mqprio->mode) {
 	case TC_MQPRIO_MODE_DCB:
-- 
2.39.5