netdev - Re: [patch net-next v2 1/3] team: handle sending port list in the same way option list is sent

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Date:	Sat, 2 Feb 2013 00:31:47 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	Pablo Neira Ayuso <pablo@...filter.org>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, fbl@...hat.com
Subject: Re: [patch net-next v2 1/3] team: handle sending port list in the
 same way option list is sent

Fri, Feb 01, 2013 at 09:43:10PM CET, pablo@...filter.org wrote:
>On Fri, Feb 01, 2013 at 08:00:26PM +0100, Jiri Pirko wrote:
>> >> +send_done:
>> >> +	nlh = nlmsg_put(skb, portid, seq, NLMSG_DONE, 0, flags | NLM_F_MULTI);
>> >> +	if (!nlh) {
>> >> +		err = __send_and_alloc_skb(&skb, team, portid, send_func);
>> >> +		if (err)
>> >> +			goto errout;
>> >> +		goto send_done;
>> >> +	}
>> >
>> >I'd suggest to use netlink_dump_start for this, so you don't need to
>> >manually create the NLMSG_DONE message.
>> 
>> I believe that is not possible for genl
>
>By looking at net/netlink/genetlink.c, you can make it by means of the
>.dumpit callback in struct genl_ops. You have to pass NLM_F_DUMP from
>user-space to hit that code.

Correct. But I need to do unsolicited multicast messages as well. And
that can't be resolved by dumpit.

>
>BTW, perhaps it is good idea to keep the old get function that takes
>no NLM_F_DUMP for a while to avoid breaking old versions of userspace
>code?
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