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Message-ID: <6e0c608a-fa54-6943-7b33-0f5520fef5f4@intel.com>
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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