netdev - Re: [patch v1, kernel version 3.2.1] Source mode for macvlan interaface

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Date:	Mon, 23 Jan 2012 15:11:19 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stefan Gula <steweg@...t.sk>
Cc:	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch v1, kernel version 3.2.1] Source mode for macvlan
 interaface

Le lundi 23 janvier 2012 à 13:30 +0100, Stefan Gula a écrit :
> From: Stefan Gula <steweg@...il.com>
> 
> New mode of macvlan interface called "source" allows one to specify,
> which  frames are allowed to be received by given macvlan interface.
> This logic is used only on received frames on underlaying interface.
> The ability to send frames from macvlan interface through underlaying
> interface is not modified. This feature allows one to simulate 802.1x
> mac based VLAN bahaviour by using proper netlink message to configure
> this behavior with utililty such as "ip link" from iproute2 suite.
> 
> Signed-off-by: Stefan Gula <steweg@...il.com>

Please limit line lengths to 70 chars.

I dont understand your patch description at all, and reading its body I
still dont understand its purpose.

Is it sort of firewall rules (ebtable) or bridging code ?

> +static void macvlan_hash_del_sources(struct macvlan_source_list *list,
> +					bool sync)
> +{
> +	hlist_del_rcu(&list->hlist);
> +	kfree_rcu(list, rcu);
> +	if (sync)
> +		synchronize_rcu();
> +}
> +

Please explain why are you using synchronize_rcu() here, as there must
be a good reason, but I missed it.



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