[PATCH net-next v2 1/8] rtnetlink: Do not generate notifications for MTU events

[David Ahern]

Changing MTU on a link currently causes 3 messages to be sent to userspace:

[LINK]11: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1490 qdisc noqueue state 
UNKNOWN group default
    link/ether f2:52:5c:6d:21:f3 brd ff:ff:ff:ff:ff:ff

[LINK]11: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state 
UNKNOWN group default
    link/ether f2:52:5c:6d:21:f3 brd ff:ff:ff:ff:ff:ff

[LINK]11: dummy1: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state 
UNKNOWN group default
    link/ether f2:52:5c:6d:21:f3 brd ff:ff:ff:ff:ff:ff

Remove the messages sent for PRE_CHANGE_MTU and CHANGE_MTU netdev events.

Signed-off-by: David Ahern <d...@cumulusnetworks.com>
---
 net/core/rtnetlink.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 58419da7961b..79ab43796b08 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -4117,7 +4117,6 @@ static int rtnetlink_event(struct notifier_block *this, 
unsigned long event, voi
 
        switch (event) {
        case NETDEV_REBOOT:
-       case NETDEV_CHANGEMTU:
        case NETDEV_CHANGEADDR:
        case NETDEV_CHANGENAME:
        case NETDEV_FEAT_CHANGE:
@@ -4126,7 +4125,6 @@ static int rtnetlink_event(struct notifier_block *this, 
unsigned long event, voi
        case NETDEV_NOTIFY_PEERS:
        case NETDEV_CHANGEUPPER:
        case NETDEV_RESEND_IGMP:
-       case NETDEV_PRECHANGEMTU:
        case NETDEV_CHANGEINFODATA:
        case NETDEV_PRECHANGEUPPER:
        case NETDEV_CHANGELOWERSTATE:
-- 
2.1.4