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

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Date:   Fri,  7 Apr 2017 14:25:33 -0700
From:   David Ahern <dsa@...ulusnetworks.com>
To:     netdev@...r.kernel.org
Cc:     vyasevic@...hat.com, davem@...emloft.net,
        David Ahern <dsa@...ulusnetworks.com>
Subject: [PATCH net-next 1/8] 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 event PRE_CHANGE_MTU
    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 event CHANGE_MTU
    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 PRE_CHANGE_MTU and CHANGE_MTU messages.

Signed-off-by: David Ahern <dsa@...ulusnetworks.com>
---
 include/uapi/linux/if_link.h | 2 --
 net/core/rtnetlink.c         | 8 --------
 2 files changed, 10 deletions(-)

diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index 97f6d302f627..e8b7e9342cc0 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -903,7 +903,6 @@ enum {
 enum {
 	IFLA_EVENT_UNSPEC,
 	IFLA_EVENT_REBOOT,
-	IFLA_EVENT_CHANGE_MTU,
 	IFLA_EVENT_CHANGE_ADDR,
 	IFLA_EVENT_CHANGE_NAME,
 	IFLA_EVENT_FEAT_CHANGE,
@@ -912,7 +911,6 @@ enum {
 	IFLA_EVENT_NOTIFY_PEERS,
 	IFLA_EVENT_CHANGE_UPPER,
 	IFLA_EVENT_RESEND_IGMP,
-	IFLA_EVENT_PRE_CHANGE_MTU,
 	IFLA_EVENT_CHANGE_INFO_DATA,
 	IFLA_EVENT_PRE_CHANGE_UPPER,
 	IFLA_EVENT_CHANGE_LOWER_STATE,
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index b2bd4c9ee860..72d365ae14b3 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1285,9 +1285,6 @@ static int rtnl_fill_link_event(struct sk_buff *skb, unsigned long event)
 	case NETDEV_REBOOT:
 		rtnl_event = IFLA_EVENT_REBOOT;
 		break;
-	case NETDEV_CHANGEMTU:
-		rtnl_event = IFLA_EVENT_CHANGE_MTU;
-		break;
 	case NETDEV_CHANGEADDR:
 		rtnl_event = IFLA_EVENT_CHANGE_ADDR;
 		break;
@@ -1312,9 +1309,6 @@ static int rtnl_fill_link_event(struct sk_buff *skb, unsigned long event)
 	case NETDEV_RESEND_IGMP:
 		rtnl_event = IFLA_EVENT_RESEND_IGMP;
 		break;
-	case NETDEV_PRECHANGEMTU:
-		rtnl_event = IFLA_EVENT_PRE_CHANGE_MTU;
-		break;
 	case NETDEV_CHANGEINFODATA:
 		rtnl_event = IFLA_EVENT_CHANGE_INFO_DATA;
 		break;
@@ -4191,7 +4185,6 @@ 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:
@@ -4200,7 +4193,6 @@ 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