netdev - Re: [patch v4, kernel version 3.2.1] net/ipv4/ip

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Date:	Wed, 25 Jan 2012 10:17:24 +0100
From:	Štefan Gula <steweg@...t.sk>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Jesse Gross <jesse@...ira.com>, David Miller <davem@...emloft.net>,
	joseph.glanville@...onvm.com.au, kuznet@....inr.ac.ru,
	jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch v4, kernel version 3.2.1] net/ipv4/ip_gre: Ethernet
 multipoint GRE over IP

2012/1/25 Eric Dumazet <eric.dumazet@...il.com>:
> Le mardi 24 janvier 2012 à 23:11 -0800, Jesse Gross a écrit :
>
>> I think it's actually the opposite - Open vSwitch can be used to
>> implement this type of thing as well as for many other use cases.  On
>> the other hand, even when implementing a multipoint L2 solution it can
>> be useful to have additional levels of control but you can't do that
>> with this patch because it essentially statically glues together
>> tunneling and bridging.
>
> Unless you can provide a working solution in a very short time, this
> patch is a pragmatic one.
>
> Code is not perfect and could be improved (for example using a helper
> function to keep ipgre_rcv() shorter and reduce indentation level)
>
> Stefan, could you move this code out of ipgre_rcv() ?
>
>
> +#ifdef CONFIG_NET_IPGRE_BRIDGE
> +                       if (ipv4_is_multicast(tunnel->parms.iph.daddr)) {
> +                               tethhdr = eth_hdr(skb);
> +                               if (!is_multicast_ether_addr(
> +                                       tethhdr->h_source)) {
> +                                       head = &tunnel->hash[
> +                                               ipgre_tap_bridge_hash(
> +                                                       tethhdr->h_source)];
> +                                       entry = ipgre_tap_bridge_find_rcu(head,
> +                                               tethhdr->h_source);
> +                                       if (likely(entry)) {
> +                                               entry->raddr = orig_source;
> +                                               entry->updated = jiffies;
> +                                       } else {
> +                                         spin_lock(&tunnel->hash_lock);
> +                                         if (!ipgre_tap_bridge_find(head,
> +                                               tethhdr->h_source))
> +                                               ipgre_tap_bridge_create(
> +                                                       head,
> +                                                       orig_source,
> +                                                       tethhdr->h_source);
> +                                         spin_unlock(&tunnel->hash_lock);
> +                                       }
> +                               }
> +                       }
> +#endif
>
>
>
Ok