Messages in this thread Patch in this message | | | Subject | [PATCH net-next] net: linkwatch: allow vlans to get carrier changes faster | From | Eric Dumazet <> | Date | Wed, 31 Aug 2011 11:31:58 +0200 |
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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> --- net/core/link_watch.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/net/core/link_watch.c b/net/core/link_watch.c index 357bd4e..c3519c6 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); }
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