[PATCH 6.18 449/752] net/mlx5: E-switch, Clear legacy flag when moving to switchdev

Sasha Levin
2026-02-28T17:54:25Z

From: Shay Drory <shayd@nvidia.com>

[ Upstream commit d7073e8b978ae925f1f0f08754f33f84d8547ea7 ]

The cited commit introduced MLX5_PRIV_FLAGS_SWITCH_LEGACY to identify
when a transition to legacy mode is requested via devlink. However, the
logic failed to clear this flag if the mode was subsequently changed
back to MLX5_ESWITCH_OFFLOADS (switchdev). Consequently, if a user
toggled from legacy to switchdev, the flag remained set, leaving the
driver with wrong state indicating

Fix this by explicitly clearing the MLX5_PRIV_FLAGS_SWITCH_LEGACY bit
when the requested mode is MLX5_ESWITCH_OFFLOADS.

Fixes: 2a4f56fbcc47 ("net/mlx5e: Keep netdev when leave switchdev for devlink set legacy only")
Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260224114652.1787431-4-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
index 784130cdf6c07..8c0e812f13c3f 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
@@ -3854,6 +3854,8 @@ int mlx5_devlink_eswitch_mode_set(struct devlink *devlink, u16 mode,

if (mode == DEVLINK_ESWITCH_MODE_LEGACY)
esw->dev->priv.flags |= MLX5_PRIV_FLAGS_SWITCH_LEGACY;
+ if (mlx5_mode == MLX5_ESWITCH_OFFLOADS)
+ esw->dev->priv.flags &= ~MLX5_PRIV_FLAGS_SWITCH_LEGACY;
mlx5_eswitch_disable_locked(esw);
if (mode == DEVLINK_ESWITCH_MODE_SWITCHDEV) {
if (mlx5_devlink_trap_get_num_active(esw->dev)) {
--
2.51.0