netdev - Re: [PATCH 2/4] ipgre: follow state of lower device

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Date:	Thu, 12 Apr 2012 18:32:07 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Stephen Hemminger <shemminger@...tta.com>
CC:	David Miller <davem@...emloft.net>, <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/4] ipgre: follow state of lower device

On Thu, 2012-04-12 at 09:31 -0700, Stephen Hemminger wrote:

> GRE tunnels like other layered devices should propogate
> carrier and RFC2863 state from lower device to tunnel.
> 
> Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
> 
> --- a/net/ipv4/ip_gre.c	2012-04-12 08:07:39.508107847 -0700
> +++ b/net/ipv4/ip_gre.c	2012-04-12 08:10:14.177499183 -0700
[...]
> @@ -1732,6 +1734,36 @@ static struct rtnl_link_ops ipgre_tap_op
>  	.fill_info	= ipgre_fill_info,
>  };
>  
> +/* If lower device changes state, reflect that to the tunnel. */
> +static int ipgre_notify(struct notifier_block *unused,
> +			unsigned long event, void *ptr)
> +{
> +	struct net_device *dev = ptr;
> +	struct net *net = dev_net(dev);
> +	struct ipgre_net *ign = net_generic(net, ipgre_net_id);
> +	unsigned int prio, h;
> +	struct ip_tunnel *t;
> +
> +	if (event == NETDEV_CHANGE)
> +		return NOTIFY_DONE;

Surely we should handle NETDEV_UP, NETDEV_CHANGE, NETDEV_DOWN here?  Not
everything other than NETDEV_CHANGE.

> +	for (prio = 0; prio < 4; prio++)
> +		for (h = 0; h < HASH_SIZE; h++) {
> +			for (t = rtnl_dereference(ign->tunnels[prio][h]);
> +			     t; t = rtnl_dereference(t->next)) {
> +				if (dev->ifindex != t->dev->iflink)
> +					continue;
> +				netif_stacked_transfer_operstate(dev, t->dev);
> +			}
> +		}
[...]

This seems potentially very inefficient.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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