netdev - Re: [patch net-next v5 02/12] devlink: remove linecard reference counting

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Date:   Wed, 18 Jan 2023 13:13:37 -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>,
        <mailhol.vincent@...adoo.fr>, <gal@...dia.com>
Subject: Re: [patch net-next v5 02/12] devlink: remove linecard reference
 counting



On 1/18/2023 7:21 AM, Jiri Pirko wrote:
> From: Jiri Pirko <jiri@...dia.com>
> 
> As long as the linecard life time is protected by devlink instance
> lock, the reference counting is no longer needed. Remove it.
> 
Makes sense.

Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>

> Signed-off-by: Jiri Pirko <jiri@...dia.com>
> Reviewed-by: Ido Schimmel <idosch@...dia.com>
> ---
> v2->v3:
> - removed devlink_linecard_put() prototype from devl_internal.h
> - fixed typo in patch description
> ---
>  net/devlink/devl_internal.h |  1 -
>  net/devlink/leftover.c      | 14 ++------------
>  net/devlink/netlink.c       |  5 -----
>  3 files changed, 2 insertions(+), 18 deletions(-)
> 
> diff --git a/net/devlink/devl_internal.h b/net/devlink/devl_internal.h
> index 32f0adc40c18..dd4e2c37cf07 100644
> --- a/net/devlink/devl_internal.h
> +++ b/net/devlink/devl_internal.h
> @@ -193,7 +193,6 @@ struct devlink_linecard;
>  
>  struct devlink_linecard *
>  devlink_linecard_get_from_info(struct devlink *devlink, struct genl_info *info);
> -void devlink_linecard_put(struct devlink_linecard *linecard);
>  
>  /* Rates */
>  extern const struct devlink_gen_cmd devl_gen_rate_get;
> diff --git a/net/devlink/leftover.c b/net/devlink/leftover.c
> index 6ba1baab80d3..c92bc04bc25c 100644
> --- a/net/devlink/leftover.c
> +++ b/net/devlink/leftover.c
> @@ -37,7 +37,6 @@ struct devlink_linecard {
>  	struct list_head list;
>  	struct devlink *devlink;
>  	unsigned int index;
> -	refcount_t refcount;
>  	const struct devlink_linecard_ops *ops;
>  	void *priv;
>  	enum devlink_linecard_state state;
> @@ -285,7 +284,6 @@ devlink_linecard_get_from_attrs(struct devlink *devlink, struct nlattr **attrs)
>  		linecard = devlink_linecard_get_by_index(devlink, linecard_index);
>  		if (!linecard)
>  			return ERR_PTR(-ENODEV);
> -		refcount_inc(&linecard->refcount);
>  		return linecard;
>  	}
>  	return ERR_PTR(-EINVAL);
> @@ -297,14 +295,6 @@ devlink_linecard_get_from_info(struct devlink *devlink, struct genl_info *info)
>  	return devlink_linecard_get_from_attrs(devlink, info->attrs);
>  }
>  
> -void devlink_linecard_put(struct devlink_linecard *linecard)
> -{
> -	if (refcount_dec_and_test(&linecard->refcount)) {
> -		mutex_destroy(&linecard->state_lock);
> -		kfree(linecard);
> -	}
> -}
> -
>  struct devlink_sb {
>  	struct list_head list;
>  	unsigned int index;
> @@ -10266,7 +10256,6 @@ devl_linecard_create(struct devlink *devlink, unsigned int linecard_index,
>  	}
>  
>  	list_add_tail(&linecard->list, &devlink->linecard_list);
> -	refcount_set(&linecard->refcount, 1);
>  	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
>  	return linecard;
>  }
> @@ -10282,7 +10271,8 @@ void devl_linecard_destroy(struct devlink_linecard *linecard)
>  	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_DEL);
>  	list_del(&linecard->list);
>  	devlink_linecard_types_fini(linecard);
> -	devlink_linecard_put(linecard);
> +	mutex_destroy(&linecard->state_lock);
> +	kfree(linecard);
>  }
>  EXPORT_SYMBOL_GPL(devl_linecard_destroy);
>  
> diff --git a/net/devlink/netlink.c b/net/devlink/netlink.c
> index b5b8ac6db2d1..3f2ab4360f11 100644
> --- a/net/devlink/netlink.c
> +++ b/net/devlink/netlink.c
> @@ -170,14 +170,9 @@ static int devlink_nl_pre_doit(const struct genl_split_ops *ops,
>  static void devlink_nl_post_doit(const struct genl_split_ops *ops,
>  				 struct sk_buff *skb, struct genl_info *info)
>  {
> -	struct devlink_linecard *linecard;
>  	struct devlink *devlink;
>  
>  	devlink = info->user_ptr[0];
> -	if (ops->internal_flags & DEVLINK_NL_FLAG_NEED_LINECARD) {
> -		linecard = info->user_ptr[1];
> -		devlink_linecard_put(linecard);
> -	}
>  	devl_unlock(devlink);
>  	devlink_put(devlink);
>  }