From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vivien Didelot Subject: Re: [PATCH net-next] switchdev: enforce no pvid flag in vlan ranges Date: Mon, 12 Oct 2015 13:36:25 -0400 Message-ID: <20151012173625.GA17983@ketchup.lan> References: <1444651299-2813-1-git-send-email-razor@blackwall.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: netdev@vger.kernel.org, sfeldma@gmail.com, jiri@resnulli.us, davem@davemloft.net, Nikolay Aleksandrov To: Nikolay Aleksandrov Return-path: Received: from mail.savoirfairelinux.com ([208.88.110.44]:50785 "EHLO mail.savoirfairelinux.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751329AbbJLRqx (ORCPT ); Mon, 12 Oct 2015 13:46:53 -0400 Content-Disposition: inline In-Reply-To: <1444651299-2813-1-git-send-email-razor@blackwall.org> Sender: netdev-owner@vger.kernel.org List-ID: Hi guys, On Oct. Monday 12 (42) 02:01 PM, Nikolay Aleksandrov wrote: > From: Nikolay Aleksandrov > > We shouldn't allow BRIDGE_VLAN_INFO_PVID flag in VLAN ranges. > > Signed-off-by: Nikolay Aleksandrov > --- > net/switchdev/switchdev.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c > index 6e4a4f9ad927..256c596de896 100644 > --- a/net/switchdev/switchdev.c > +++ b/net/switchdev/switchdev.c > @@ -720,6 +720,9 @@ static int switchdev_port_br_afspec(struct net_device *dev, > if (vlan.vid_begin) > return -EINVAL; > vlan.vid_begin = vinfo->vid; > + /* don't allow range of pvids */ > + if (vlan.flags & BRIDGE_VLAN_INFO_PVID) > + return -EINVAL; > } else if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END) { > if (!vlan.vid_begin) > return -EINVAL; > -- > 2.4.3 > Yes the patch looks good, but it is a minor check though. I hope the subject of this thread is making sense. VLAN ranges seem to have been included for an UX purpose (so commands look like Cisco IOS). We don't want to change any existing interface, so we pushed that down to drivers, with the only valid reason that, maybe one day, an hardware can be capable of programming a range on a per-port basis. So what happens is that we'll add some code to fix and check non-sense (e.g. range + PVID) in switchdev, bridge, and I'm sure we are missing other spots. Sorry for being insistent, but this still doesn't look right to me. It seems like we are bloating bridge, switchdev and drivers for the only reason to maintain a kernel support for something like: # for i in $(seq 100 4000); do bridge vlan add vid $i dev swp0; done Thanks, -v