netdev - Re: [patch net-next 6/8] genetlink: introduce helpers to do filtered multicast

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Message-ID: <ZVXBqGyBkalA3nM9@nanopsycho>
Date: Thu, 16 Nov 2023 08:15:52 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
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,
	amritha.nambiar@...el.com, sdf@...gle.com
Subject: Re: [patch net-next 6/8] genetlink: introduce helpers to do filtered
 multicast

Wed, Nov 15, 2023 at 03:53:37PM CET, andriy.shevchenko@...ux.intel.com wrote:
>On Wed, Nov 15, 2023 at 03:17:22PM +0100, Jiri Pirko wrote:
>> From: Jiri Pirko <jiri@...dia.com>
>> 
>> Currently it is possible for netlink kernel user to pass custom
>> filter function to broadcast send function netlink_broadcast_filtered().
>> However, this is not exposed to multicast send and to generic
>> netlink users.
>> 
>> Extend the api and introduce a netlink helper nlmsg_multicast_filtered()
>> and a generic netlink helper genlmsg_multicast_netns_filtered()
>> to allow generic netlink families to specify filter function
>> while sending multicast messages.
>
>...
>
>> +/**
>> + * genlmsg_multicast_netns_filtered - multicast a netlink message
>> + *				      to a specific netns with filter
>> + *				      function
>> + * @family: the generic netlink family
>> + * @net: the net namespace
>> + * @skb: netlink message as socket buffer
>> + * @portid: own netlink portid to avoid sending to yourself
>> + * @group: offset of multicast group in groups array
>> + * @flags: allocation flags
>> + * @filter: filter function
>> + * @filter_data: filter function private data
>
>	scripts/kernel-doc -v -none -Wall ...
>
>will complain.

Will fix.


>
>> + */
>
>...
>
>> +				 int (*filter)(struct sock *dsk,
>> +					       struct sk_buff *skb,
>> +					       void *data),
>
>Since it occurs more than once, perhaps
>
>typedef int (*genlmsg_filter_fn)(struct sock *, struct sk_buff *, void *);

Makes sense. Will make that in a separate patch before this one.


>
>?
>
>...
>
>>  /**
>> - * nlmsg_multicast - multicast a netlink message
>> + * nlmsg_multicast_filtered - multicast a netlink message with filter function
>>   * @sk: netlink socket to spread messages to
>>   * @skb: netlink message as socket buffer
>>   * @portid: own netlink portid to avoid sending to yourself
>>   * @group: multicast group id
>>   * @flags: allocation flags
>> + * @filter: filter function
>> + * @filter_data: filter function private data
>
>I believe same complain by kernel-doc here and in more places...
>
>Can you at least make sure your patches do not add new ones and removes ones
>where you touch the code?

Okay.


>
>-- 
>With Best Regards,
>Andy Shevchenko
>
>