netdev - 答复: [PATCH] ipvlan: flush arp table when mac address changed

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Date:   Mon, 14 May 2018 08:49:07 +0000
From:   liuqifa <liuqifa@...wei.com>
To:     Paolo Abeni <pabeni@...hat.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "dsahern@...il.com" <dsahern@...il.com>,
        "maheshb@...gle.com" <maheshb@...gle.com>,
        "weiyongjun (A)" <weiyongjun1@...wei.com>,
        maowenan <maowenan@...wei.com>,
        Dingtianhong <dingtianhong@...wei.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: 答复: [PATCH] ipvlan: flush arp table when mac address changed

Hi,
> 
> Hi,
> 
> On Sat, 2018-05-12 at 19:00 +0800, liuqifa@...wei.com wrote:
> > From: Keefe Liu <liuqifa@...wei.com>
> >
> > When master device's mac has been changed, the commit <32c10bbfe914>
> > "ipvlan: always use the current L2 addr of the master" makes the
> > IPVlan devices's mac changed also, but it doesn't flush the IPVlan's
> > arp table.
> >
> > Signed-off-by: Keefe Liu <liuqifa@...wei.com>
> > ---
> >  drivers/net/ipvlan/ipvlan_main.c | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/ipvlan/ipvlan_main.c
> > b/drivers/net/ipvlan/ipvlan_main.c
> > index 450eec2..a1edfe1 100644
> > --- a/drivers/net/ipvlan/ipvlan_main.c
> > +++ b/drivers/net/ipvlan/ipvlan_main.c
> > @@ -7,6 +7,8 @@
> >   *
> >   */
> >
> > +#include <net/neighbour.h>
> > +#include <net/arp.h>
> >  #include "ipvlan.h"
> >
> >  static unsigned int ipvlan_netid __read_mostly; @@ -792,8 +794,10 @@
> > static int ipvlan_device_event(struct notifier_block *unused,
> >  		break;
> >
> >  	case NETDEV_CHANGEADDR:
> > -		list_for_each_entry(ipvlan, &port->ipvlans, pnode)
> > +		list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
> >  			ether_addr_copy(ipvlan->dev->dev_addr, dev-
> >dev_addr);
> > +			neigh_changeaddr(&arp_tbl, ipvlan->dev);
> > +		}
> 
> Why don't using:
> 
>  call_netdevice_notifiers(NETDEV_CHANGEADDR, ipvlan->dev);
> 
> instead?
> 
> that is what other stacked device - bridge and vlans - are currently doing in
> the same scenario.
> 
> Thanks,
> 
> Paolo
>
Yes, I agre with you, this is a better solution.

Thanks

Keefe