netdev - Re: [patch net-next v2 6/9] netlink: introduce typedef for filter function

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Date: Sun, 19 Nov 2023 14:58:55 +0000
From: Simon Horman <horms@...nel.org>
To: Jiri Pirko <jiri@...nulli.us>
Cc: netdev@...r.kernel.org, kuba@...nel.org, pabeni@...hat.com,
	davem@...emloft.net, edumazet@...gle.com, jacob.e.keller@...el.com,
	jhs@...atatu.com, johannes@...solutions.net,
	andriy.shevchenko@...ux.intel.com, amritha.nambiar@...el.com,
	sdf@...gle.com
Subject: Re: [patch net-next v2 6/9] netlink: introduce typedef for filter
 function

On Thu, Nov 16, 2023 at 05:48:18PM +0100, Jiri Pirko wrote:
> From: Jiri Pirko <jiri@...dia.com>
> 
> Make the code using filter function a bit nicer by consolidating the
> filter function arguments using typedef.
> 
> Suggested-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Signed-off-by: Jiri Pirko <jiri@...dia.com>
> ---
> v1->v2:
> - new patch
> ---
>  drivers/connector/connector.c | 5 ++---
>  include/linux/connector.h     | 6 ++----
>  include/linux/netlink.h       | 6 ++++--
>  net/netlink/af_netlink.c      | 6 ++----
>  4 files changed, 10 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/connector/connector.c b/drivers/connector/connector.c
> index 7f7b94f616a6..4028e8eeba82 100644
> --- a/drivers/connector/connector.c
> +++ b/drivers/connector/connector.c
> @@ -59,9 +59,8 @@ static int cn_already_initialized;
>   * both, or if both are zero then the group is looked up and sent there.
>   */
>  int cn_netlink_send_mult(struct cn_msg *msg, u16 len, u32 portid, u32 __group,
> -	gfp_t gfp_mask,
> -	int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data),
> -	void *filter_data)
> +			 gfp_t gfp_mask, netlink_filter_fn filter,
> +			 void *filter_data)
>  {
>  	struct cn_callback_entry *__cbq;
>  	unsigned int size;
> diff --git a/include/linux/connector.h b/include/linux/connector.h
> index cec2d99ae902..cb18d70d623f 100644
> --- a/include/linux/connector.h
> +++ b/include/linux/connector.h
> @@ -98,10 +98,8 @@ void cn_del_callback(const struct cb_id *id);
>   *
>   * If there are no listeners for given group %-ESRCH can be returned.
>   */
> -int cn_netlink_send_mult(struct cn_msg *msg, u16 len, u32 portid,
> -			 u32 group, gfp_t gfp_mask,
> -			 int (*filter)(struct sock *dsk, struct sk_buff *skb,
> -				       void *data),
> +int cn_netlink_send_mult(struct cn_msg *msg, u16 len, u32 portid, u32 __group,
> +			 gfp_t gfp_mask, netlink_filter_fn filter,
>  			 void *filter_data);

nit: It might be good to update the kernel doc to account for
     group => group.
     Curiously the kernel doc already documents filter_data rather
     than data.

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