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Date: Fri, 27 Jan 2023 16:08:48 -0800
From: Jacob Keller <jacob.e.keller@...el.com>
To: Jiri Pirko <jiri@...nulli.us>, <netdev@...r.kernel.org>
CC: <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>,
<edumazet@...gle.com>, <michael.chan@...adcom.com>,
<yisen.zhuang@...wei.com>, <salil.mehta@...wei.com>,
<jesse.brandeburg@...el.com>, <anthony.l.nguyen@...el.com>,
<tariqt@...dia.com>, <saeedm@...dia.com>, <leon@...nel.org>,
<idosch@...dia.com>, <petrm@...dia.com>, <gal@...dia.com>,
<mailhol.vincent@...adoo.fr>
Subject: Re: [patch net-next 3/3] devlink: remove devlink features
On 1/27/2023 7:50 AM, Jiri Pirko wrote:
> From: Jiri Pirko <jiri@...dia.com>
>
> Devlink features were introduced to disallow devlink reload calls of
> userspace before the devlink was fully initialized. The reason for this
> workaround was the fact that devlink reload was originally called
> without devlink instance lock held.
>
> However, with recent changes that converted devlink reload to be
> performed under devlink instance lock, this is redundant so remove
> devlink features entirely.
>
> Note that mlx5 used this to enable devlink reload conditionally only
> when device didn't act as multi port slave. Move the multi port check
> into mlx5_devlink_reload_down() callback alongside with the other
> checks preventing the device from reload in certain states.
>
Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>
> Signed-off-by: Jiri Pirko <jiri@...dia.com>
> ---
> .../net/ethernet/broadcom/bnxt/bnxt_devlink.c | 1 -
> .../hisilicon/hns3/hns3pf/hclge_devlink.c | 1 -
> .../hisilicon/hns3/hns3vf/hclgevf_devlink.c | 1 -
> drivers/net/ethernet/intel/ice/ice_devlink.c | 1 -
> drivers/net/ethernet/mellanox/mlx4/main.c | 1 -
> .../net/ethernet/mellanox/mlx5/core/devlink.c | 9 +++++----
> drivers/net/ethernet/mellanox/mlxsw/core.c | 1 -
> drivers/net/netdevsim/dev.c | 1 -
> include/net/devlink.h | 2 +-
> net/devlink/core.c | 19 -------------------
> net/devlink/devl_internal.h | 1 -
> net/devlink/leftover.c | 3 ---
> 12 files changed, 6 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
> index 26913dc816d3..8b3e7697390f 100644
> --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
> +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
> @@ -1303,7 +1303,6 @@ int bnxt_dl_register(struct bnxt *bp)
> if (rc)
> goto err_dl_port_unreg;
>
> - devlink_set_features(dl, DEVLINK_F_RELOAD);
> out:
> devlink_register(dl);
> return 0;
> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c
> index 3d3b69605423..9a939c0b217f 100644
> --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c
> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_devlink.c
> @@ -114,7 +114,6 @@ int hclge_devlink_init(struct hclge_dev *hdev)
> priv->hdev = hdev;
> hdev->devlink = devlink;
>
> - devlink_set_features(devlink, DEVLINK_F_RELOAD);
> devlink_register(devlink);
> return 0;
> }
> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_devlink.c b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_devlink.c
> index a6c3c5e8f0ab..1b535142c65a 100644
> --- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_devlink.c
> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_devlink.c
> @@ -116,7 +116,6 @@ int hclgevf_devlink_init(struct hclgevf_dev *hdev)
> priv->hdev = hdev;
> hdev->devlink = devlink;
>
> - devlink_set_features(devlink, DEVLINK_F_RELOAD);
> devlink_register(devlink);
> return 0;
> }
> diff --git a/drivers/net/ethernet/intel/ice/ice_devlink.c b/drivers/net/ethernet/intel/ice/ice_devlink.c
> index ce753d23aba9..88497363fc4c 100644
> --- a/drivers/net/ethernet/intel/ice/ice_devlink.c
> +++ b/drivers/net/ethernet/intel/ice/ice_devlink.c
> @@ -1376,7 +1376,6 @@ void ice_devlink_register(struct ice_pf *pf)
> {
> struct devlink *devlink = priv_to_devlink(pf);
>
> - devlink_set_features(devlink, DEVLINK_F_RELOAD);
> devlink_register(devlink);
> }
>
> diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
> index 6152f77dcfd8..277738c50c56 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/main.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/main.c
> @@ -4031,7 +4031,6 @@ static int mlx4_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
> goto err_params_unregister;
>
> pci_save_state(pdev);
> - devlink_set_features(devlink, DEVLINK_F_RELOAD);
> devl_unlock(devlink);
> devlink_register(devlink);
> return 0;
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
> index 95a69544a685..63fb7912b032 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
> @@ -156,6 +156,11 @@ static int mlx5_devlink_reload_down(struct devlink *devlink, bool netns_change,
> return -EOPNOTSUPP;
> }
>
> + if (mlx5_core_is_mp_slave(dev)) {
> + NL_SET_ERR_MSG_MOD(extack, "reload is unsupported for multi port slave");
> + return -EOPNOTSUPP;
> + }
> +
> if (pci_num_vf(pdev)) {
> NL_SET_ERR_MSG_MOD(extack, "reload while VFs are present is unfavorable");
> }
> @@ -744,7 +749,6 @@ void mlx5_devlink_traps_unregister(struct devlink *devlink)
>
> int mlx5_devlink_params_register(struct devlink *devlink)
> {
> - struct mlx5_core_dev *dev = devlink_priv(devlink);
> int err;
>
> err = devl_params_register(devlink, mlx5_devlink_params,
> @@ -762,9 +766,6 @@ int mlx5_devlink_params_register(struct devlink *devlink)
> if (err)
> goto max_uc_list_err;
>
> - if (!mlx5_core_is_mp_slave(dev))
> - devlink_set_features(devlink, DEVLINK_F_RELOAD);
> -
> return 0;
>
> max_uc_list_err:
> diff --git a/drivers/net/ethernet/mellanox/mlxsw/core.c b/drivers/net/ethernet/mellanox/mlxsw/core.c
> index f8623e8388c8..42422a106433 100644
> --- a/drivers/net/ethernet/mellanox/mlxsw/core.c
> +++ b/drivers/net/ethernet/mellanox/mlxsw/core.c
> @@ -2285,7 +2285,6 @@ __mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
> }
>
> if (!reload) {
> - devlink_set_features(devlink, DEVLINK_F_RELOAD);
> devl_unlock(devlink);
> devlink_register(devlink);
> }
> diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
> index f88095b0f836..6045bece2654 100644
> --- a/drivers/net/netdevsim/dev.c
> +++ b/drivers/net/netdevsim/dev.c
> @@ -1609,7 +1609,6 @@ int nsim_drv_probe(struct nsim_bus_dev *nsim_bus_dev)
> goto err_hwstats_exit;
>
> nsim_dev->esw_mode = DEVLINK_ESWITCH_MODE_LEGACY;
> - devlink_set_features(devlink, DEVLINK_F_RELOAD);
> devl_unlock(devlink);
> return 0;
>
> diff --git a/include/net/devlink.h b/include/net/devlink.h
> index ab654cf552b8..2e85a5970a32 100644
> --- a/include/net/devlink.h
> +++ b/include/net/devlink.h
> @@ -1645,7 +1645,7 @@ static inline struct devlink *devlink_alloc(const struct devlink_ops *ops,
> {
> return devlink_alloc_ns(ops, priv_size, &init_net, dev);
> }
> -void devlink_set_features(struct devlink *devlink, u64 features);
> +
> int devl_register(struct devlink *devlink);
> void devl_unregister(struct devlink *devlink);
> void devlink_register(struct devlink *devlink);
> diff --git a/net/devlink/core.c b/net/devlink/core.c
> index 6c0e2fc57e45..aeffd1b8206d 100644
> --- a/net/devlink/core.c
> +++ b/net/devlink/core.c
> @@ -125,23 +125,6 @@ struct devlink *devlinks_xa_find_get(struct net *net, unsigned long *indexp)
> goto retry;
> }
>
> -/**
> - * devlink_set_features - Set devlink supported features
> - *
> - * @devlink: devlink
> - * @features: devlink support features
> - *
> - * This interface allows us to set reload ops separatelly from
> - * the devlink_alloc.
> - */
> -void devlink_set_features(struct devlink *devlink, u64 features)
> -{
> - WARN_ON(features & DEVLINK_F_RELOAD &&
> - !devlink_reload_supported(devlink->ops));
> - devlink->features = features;
> -}
> -EXPORT_SYMBOL_GPL(devlink_set_features);
> -
> /**
> * devl_register - Register devlink instance
> * @devlink: devlink
> @@ -303,7 +286,6 @@ static void __net_exit devlink_pernet_pre_exit(struct net *net)
> * all devlink instances from this namespace into init_net.
> */
> devlinks_xa_for_each_registered_get(net, index, devlink) {
> - WARN_ON(!(devlink->features & DEVLINK_F_RELOAD));
> devl_lock(devlink);
> err = 0;
> if (devl_is_registered(devlink))
> @@ -313,7 +295,6 @@ static void __net_exit devlink_pernet_pre_exit(struct net *net)
> &actions_performed, NULL);
> devl_unlock(devlink);
> devlink_put(devlink);
> -
> if (err && err != -EOPNOTSUPP)
> pr_warn("Failed to reload devlink instance into init_net\n");
> }
> diff --git a/net/devlink/devl_internal.h b/net/devlink/devl_internal.h
> index d0d889038138..ba161de4120e 100644
> --- a/net/devlink/devl_internal.h
> +++ b/net/devlink/devl_internal.h
> @@ -38,7 +38,6 @@ struct devlink {
> struct list_head trap_policer_list;
> struct list_head linecard_list;
> const struct devlink_ops *ops;
> - u64 features;
> struct xarray snapshot_ids;
> struct devlink_dev_stats stats;
> struct device *dev;
> diff --git a/net/devlink/leftover.c b/net/devlink/leftover.c
> index 4f78ef5a46af..92210587d349 100644
> --- a/net/devlink/leftover.c
> +++ b/net/devlink/leftover.c
> @@ -4387,9 +4387,6 @@ static int devlink_nl_cmd_reload(struct sk_buff *skb, struct genl_info *info)
> u32 actions_performed;
> int err;
>
> - if (!(devlink->features & DEVLINK_F_RELOAD))
> - return -EOPNOTSUPP;
> -
> err = devlink_resources_validate(devlink, NULL, info);
> if (err) {
> NL_SET_ERR_MSG_MOD(info->extack, "resources size validation failed");
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