netdev - Re: [PATCH net-next] rtnetlink: delay RTM_DELLINK notification until after ndo

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Message-ID: <20141202100746.GA13717@casper.infradead.org>
Date:	Tue, 2 Dec 2014 10:07:46 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	Mahesh Bandewar <maheshb@...gle.com>
Cc:	netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Roopa Prabhu <roopa@...ulusnetworks.com>,
	Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
Subject: Re: [PATCH net-next] rtnetlink: delay RTM_DELLINK notification until
 after ndo_uninit()

On 12/01/14 at 09:54pm, Mahesh Bandewar wrote:
> --- a/net/core/rtnetlink.c
> +++ b/net/core/rtnetlink.c
> @@ -2220,8 +2220,16 @@ static int rtnl_dump_all(struct sk_buff *skb, struct netlink_callback *cb)
>  	return skb->len;
>  }
>  
> -void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
> -		  gfp_t flags)
> +void rtmsg_ifinfo_send(struct sk_buff *skb, struct net_device *dev, gfp_t flags)
> +{
> +	struct net *net = dev_net(dev);
> +
> +	rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
> +}
> +EXPORT_SYMBOL(rtmsg_ifinfo_send);
> +
> +struct sk_buff *rtmsg_ifinfo(int type, struct net_device *dev,
> +			     unsigned int change, gfp_t flags, bool fill_only)
>  {
>  	struct net *net = dev_net(dev);
>  	struct sk_buff *skb;
> @@ -2239,11 +2247,15 @@ void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
>  		kfree_skb(skb);
>  		goto errout;
>  	}
> +	if (fill_only)
> +	    return skb;
> +
>  	rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, flags);
> -	return;
> +	return NULL;
>  errout:
>  	if (err < 0)
>  		rtnl_set_sk_err(net, RTNLGRP_LINK, err);
> +	return NULL;
>  }

I think it would be cleaner to introduce a new function, for example
rtmsg_ifinfo_build_skb() which is called from rtmsg_ifinfo(). The
single caller that requires delayed sending can use the build skb
function directly and then send it off.

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