From 75b81ce719b79565eb0b39aa9954b6e11a5e73bf Mon Sep 17 00:00:00 2001 From: Gal Pressman Date: Wed, 10 Jan 2018 17:11:11 +0200 Subject: [PATCH] net/mlx5e: Don't override netdev features field unless in error flow Set features function sets dev->features in order to keep track of which features were successfully changed and which weren't (in case the user asks for more than one change in a single command). This breaks the logic in __netdev_update_features which assumes that dev->features is not changed on success and checks for diffs between features and dev->features (diffs that might not exist at this point because of the driver override). The solution is to keep track of successful/failed feature changes and assign them to dev->features in case of failure only. Fixes: 0e405443e803 ("net/mlx5e: Improve set features ndo resiliency") Signed-off-by: Gal Pressman Signed-off-by: Saeed Mahameed --- .../net/ethernet/mellanox/mlx5/core/en_main.c | 43 +++++++++++-------- 1 file changed, 25 insertions(+), 18 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c index d9d8227f195f..311d5ec8407c 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c @@ -3219,12 +3219,12 @@ static int mlx5e_set_mac(struct net_device *netdev, void *addr) return 0; } -#define MLX5E_SET_FEATURE(netdev, feature, enable) \ +#define MLX5E_SET_FEATURE(features, feature, enable) \ do { \ if (enable) \ - netdev->features |= feature; \ + *features |= feature; \ else \ - netdev->features &= ~feature; \ + *features &= ~feature; \ } while (0) typedef int (*mlx5e_feature_handler)(struct net_device *netdev, bool enable); @@ -3347,6 +3347,7 @@ static int set_feature_arfs(struct net_device *netdev, bool enable) #endif static int mlx5e_handle_feature(struct net_device *netdev, + netdev_features_t *features, netdev_features_t wanted_features, netdev_features_t feature, mlx5e_feature_handler feature_handler) @@ -3365,34 +3366,40 @@ static int mlx5e_handle_feature(struct net_device *netdev, return err; } - MLX5E_SET_FEATURE(netdev, feature, enable); + MLX5E_SET_FEATURE(features, feature, enable); return 0; } static int mlx5e_set_features(struct net_device *netdev, netdev_features_t features) { + netdev_features_t oper_features = netdev->features; int err; - err = mlx5e_handle_feature(netdev, features, NETIF_F_LRO, - set_feature_lro); - err |= mlx5e_handle_feature(netdev, features, + err = mlx5e_handle_feature(netdev, &oper_features, features, + NETIF_F_LRO, set_feature_lro); + err |= mlx5e_handle_feature(netdev, &oper_features, features, NETIF_F_HW_VLAN_CTAG_FILTER, set_feature_cvlan_filter); - err |= mlx5e_handle_feature(netdev, features, NETIF_F_HW_TC, - set_feature_tc_num_filters); - err |= mlx5e_handle_feature(netdev, features, NETIF_F_RXALL, - set_feature_rx_all); - err |= mlx5e_handle_feature(netdev, features, NETIF_F_RXFCS, - set_feature_rx_fcs); - err |= mlx5e_handle_feature(netdev, features, NETIF_F_HW_VLAN_CTAG_RX, - set_feature_rx_vlan); + err |= mlx5e_handle_feature(netdev, &oper_features, features, + NETIF_F_HW_TC, set_feature_tc_num_filters); + err |= mlx5e_handle_feature(netdev, &oper_features, features, + NETIF_F_RXALL, set_feature_rx_all); + err |= mlx5e_handle_feature(netdev, &oper_features, features, + NETIF_F_RXFCS, set_feature_rx_fcs); + err |= mlx5e_handle_feature(netdev, &oper_features, features, + NETIF_F_HW_VLAN_CTAG_RX, set_feature_rx_vlan); #ifdef CONFIG_RFS_ACCEL - err |= mlx5e_handle_feature(netdev, features, NETIF_F_NTUPLE, - set_feature_arfs); + err |= mlx5e_handle_feature(netdev, &oper_features, features, + NETIF_F_NTUPLE, set_feature_arfs); #endif - return err ? -EINVAL : 0; + if (err) { + netdev->features = oper_features; + return -EINVAL; + } + + return 0; } static netdev_features_t mlx5e_fix_features(struct net_device *netdev,