Commit 085e1a65 authored Apr 11, 2017 by David Ahern Committed by David S. Miller Apr 13, 2017

rtnetlink: Do not generate notifications for MTU events



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 <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent b6518e6a

net/core/rtnetlink.c

+0 −2

Original line number	Diff line number	Diff line
		@@ -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: