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net: ipv4: Notify about changes to ip_forward_update_priority

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Drivers may make offloading decision based on whether
ip_forward_update_priority is enabled or not. Therefore distribute
netevent notifications to give them a chance to react to a change.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petr Machata 2018-08-01 00:36:42 +02:00 committed by David S. Miller
parent 432e05d328
commit d18c5d1995
2 changed files with 19 additions and 1 deletions
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1
include/net/netevent.h
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@ -28,6 +28,7 @@ enum netevent_notif_type {
NETEVENT_DELAY_PROBE_TIME_UPDATE, /* arg is struct neigh_parms ptr */
NETEVENT_IPV4_MPATH_HASH_UPDATE, /* arg is struct net ptr */
NETEVENT_IPV6_MPATH_HASH_UPDATE, /* arg is struct net ptr */
NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE, /* arg is struct net ptr */
};
int register_netevent_notifier(struct notifier_block *nb);

19
net/ipv4/sysctl_net_ipv4.c
View File

@ -201,6 +201,23 @@ static int ipv4_ping_group_range(struct ctl_table *table, int write,
return ret;
}
static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
void __user *buffer,
size_t *lenp, loff_t *ppos)
{
struct net *net;
int ret;
net = container_of(table->data, struct net,
ipv4.sysctl_ip_fwd_update_priority);
ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
if (write && ret == 0)
call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
net);
return ret;
}
static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
@ -668,7 +685,7 @@ static struct ctl_table ipv4_net_table[] = {
.data = &init_net.ipv4.sysctl_ip_fwd_update_priority,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.proc_handler = ipv4_fwd_update_priority,
.extra1 = &zero,
.extra2 = &one,
},