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net: linkwatch: allow vlans to get carrier changes faster 

There is a time-lag of IFF_RUNNING flag consistency between vlan and
real devices when the real devices are in problem such as link or cable
broken.

This leads to a degradation of Availability such as a delay of failover
in HA systems using vlan since the detection of the problem at real
device is delayed.

We can avoid the linkwatch delay (~1 sec) for devices linked to another
ones, since delay is already done for the realdev.

Based on a previous patch from Mitsuo Hayasaka

Reported-by: Mitsuo Hayasaka <mitsuo.hayasaka.hu@hitachi.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Patrick McHardy <kaber@trash.net>
Cc: "Michał Mirosław" <mirq-linux@rere.qmqm.pl>
Cc: Tom Herbert <therbert@google.com>
Cc: Stephen Hemminger <shemminger@vyatta.com>
Cc: Jesse Gross <jesse@nicira.com>
Tested-by: Mitsuo Hayasaka <mitsuo.hayasaka.hu@hitachi.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2011-08-30 23:31:58 +00:00 committed by David S. Miller
parent 3e829a784c
commit c37e0c9930
1 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
net/core/link_watch.c
View File

@ -78,8 +78,13 @@ static void rfc2863_policy(struct net_device *dev)
static bool linkwatch_urgent_event(struct net_device *dev)
{
return netif_running(dev) && netif_carrier_ok(dev) &&
qdisc_tx_changing(dev);
if (!netif_running(dev))
return false;
if (dev->ifindex != dev->iflink)
return true;
return netif_carrier_ok(dev) && qdisc_tx_changing(dev);
}