[PATCH 5.4 020/154] net/mlx5e: Prevent bridge link show failure for non-eswitch-allowed devices

Greg Kroah-Hartman
2025-04-08T12:03:08Z

From: Carolina Jubran <cjubran@nvidia.com>

[ Upstream commit e92df790d07a8eea873efcb84776e7b71f81c7d5 ]

mlx5_eswitch_get_vepa returns -EPERM if the device lacks
eswitch_manager capability, blocking mlx5e_bridge_getlink from
retrieving VEPA mode. Since mlx5e_bridge_getlink implements
ndo_bridge_getlink, returning -EPERM causes bridge link show to fail
instead of skipping devices without this capability.

To avoid this, return -EOPNOTSUPP from mlx5e_bridge_getlink when
mlx5_eswitch_get_vepa fails, ensuring the command continues processing
other devices while ignoring those without the necessary capability.

Fixes: 4b89251de024 ("net/mlx5: Support ndo bridge_setlink and getlink")
Signed-off-by: Carolina Jubran <cjubran@nvidia.com>
Reviewed-by: Jianbo Liu <jianbol@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Link: https://patch.msgid.link/1741644104-97767-7-git-send-email-tariqt@nvidia.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 363c4ab059909..b3ba996004f1d 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -4684,11 +4684,9 @@ static int mlx5e_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
struct mlx5e_priv *priv = netdev_priv(dev);
struct mlx5_core_dev *mdev = priv->mdev;
u8 mode, setting;
- int err;

- err = mlx5_eswitch_get_vepa(mdev->priv.eswitch, &setting);
- if (err)
- return err;
+ if (mlx5_eswitch_get_vepa(mdev->priv.eswitch, &setting))
+ return -EOPNOTSUPP;
mode = setting ? BRIDGE_MODE_VEPA : BRIDGE_MODE_VEB;
return ndo_dflt_bridge_getlink(skb, pid, seq, dev,
mode,
--
2.39.5