On Tue, 2019-11-05 at 18:06 -0600, Thomas Falcon wrote:
> After a migration, it is necessary to send a gratuitous ARP
> from all running interfaces so that the rest of the network
> is aware of its new location. However, some supported network
> devices are unaware that they have been migrated. To avoid network
> interruptions and other unwanted behavior, force a GARP on all
> valid, running interfaces as part of the post_mobility_fixup
> routine.
>
> Signed-off-by: Thomas Falcon <tlfal...@linux.ibm.com>
Hi Thomas,
> ---
> arch/powerpc/platforms/pseries/mobility.c | 20 ++++++++++++++++++++
> 1 file changed, 20 insertions(+)
>
> diff --git a/arch/powerpc/platforms/pseries/mobility.c
> b/arch/powerpc/platforms/pseries/mobility.c
> index b571285f6c14..c1abc14cf2bb 100644
> --- a/arch/powerpc/platforms/pseries/mobility.c
> +++ b/arch/powerpc/platforms/pseries/mobility.c
> @@ -17,6 +17,9 @@
> #include <linux/delay.h>
> #include <linux/slab.h>
> #include <linux/stringify.h>
> +#include <linux/netdevice.h>
> +#include <linux/rtnetlink.h>
> +#include <net/net_namespace.h>
>
> #include <asm/machdep.h>
> #include <asm/rtas.h>
> @@ -331,6 +334,8 @@ void post_mobility_fixup(void)
> {
> int rc;
> int activate_fw_token;
> + struct net_device *netdev;
> + struct net *net;
>
> activate_fw_token = rtas_token("ibm,activate-firmware");
> if (activate_fw_token == RTAS_UNKNOWN_SERVICE) {
> @@ -371,6 +376,21 @@ void post_mobility_fixup(void)
> /* Possibly switch to a new RFI flush type */
> pseries_setup_rfi_flush();
>
> + /* need to force a gratuitous ARP on running interfaces */
> + rtnl_lock();
> + for_each_net(net) {
> + for_each_netdev(net, netdev) {
> + if (netif_device_present(netdev) &&
> + netif_running(netdev) &&
> + !(netdev->flags & (IFF_NOARP |
> IFF_LOOPBACK)))
> + call_netdevice_notifiers(NETDEV_NOTIFY_
> PEERS,
> + netdev);
Without curly braces following the "if" statment, the second line
(below) will be executed unconditionally, which I assume with this
indentation isn't what you want.
(reported by snowpatch)
- Russell
> + call_netdevice_notifiers(NETDEV_RESEND_
> IGMP,
> + netdev);
> + }
> + }
> + rtnl_unlock();
> +
> return;
> }
>
