netdev - Re: [RFC PATCH net-next] ppp: Allow ppp device connected to an l2tp session to change of namespace

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Date:	Thu, 24 Oct 2013 18:23:14 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	François Cachereul <f.cachereul@...halink.fr>,
	Paul Mackerras <paulus@...ba.org>,
	James Chapman <jchapman@...alix.com>
CC:	netdev@...r.kernel.org, linux-ppp@...r.kernel.org
Subject: Re: [RFC PATCH net-next] ppp: Allow ppp device connected to an l2tp
 session to change of namespace

Hello.

On 10/24/2013 02:30 PM, François Cachereul wrote:

> Remove NETIF_F_NETNS_LOCAL flag from ppp device in ppp_connect_channel()
> if the device is connected to a l2tp session socket.
> Restore the flag in ppp_disconnect_channel().

> Signed-off-by: François CACHEREUL <f.cachereul@...halink.fr>
> ---
> I'm trying to get rid of this flag for ppp device connected to l2tp
> session, it's seem to be safe to do it for as l2tp_ppp module hasn't any
> reference to the ppp device except to the device name. We can probably
> do it for others modules but pppoe and pptp will require more work.

> I remove the flag for l2tp in ppp_generic.c because I couldn't find a
> place like a callback to do it in l2tp_ppp.c. The best will be to
> remove the flag for all ppp devices.

> François

>   drivers/net/ppp/ppp_generic.c |   11 +++++++++++
>   1 file changed, 11 insertions(+)

> diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c
> index 72ff14b..7ccf2ae 100644
> --- a/drivers/net/ppp/ppp_generic.c
> +++ b/drivers/net/ppp/ppp_generic.c
[...]
> @@ -2883,6 +2886,13 @@ ppp_connect_channel(struct channel *pch, int unit)
>   	++ppp->n_channels;
>   	pch->ppp = ppp;
>   	atomic_inc(&ppp->file.refcnt);
> +
> +	/* allow ppp net device to be moved in another network namespace
> +	 * if it's connected to an l2tp session */

    Acording to Documentation/CodingStyle, the preferred comment style in the 
networking code is:

/* bla
  * bla
  */

WBR, Sergei

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