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authorEric Dumazet <eric.dumazet@gmail.com>2011-08-30 23:31:58 +0000
committerDavid S. Miller <davem@davemloft.net>2011-09-15 15:36:34 -0400
commitc37e0c993055d8c4fd82202331d06e6ef9bfec4b (patch)
tree6145e674eef915ec15f605646be59c4b9ff4852b /net/core
parent3e829a784c16513ac9a1d29ad23d7753d8f40b79 (diff)
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>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/link_watch.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/net/core/link_watch.c b/net/core/link_watch.c
index 357bd4ee4ba..c3519c6d1b1 100644
--- a/net/core/link_watch.c
+++ b/net/core/link_watch.c
@@ -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);
}