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Commit 3ae6ec08 authored by Ido Schimmel's avatar Ido Schimmel Committed by David S. Miller
Browse files

ipv4: Send a netevent whenever multipath hash policy is changed 



Devices performing IPv4 forwarding need to update their multipath hash
policy whenever it is changed.

Inform these devices by generating a netevent.

Signed-off-by: default avatarIdo Schimmel <idosch@mellanox.com>
Reviewed-by: default avatarPetr Machata <petrm@mellanox.com>
Signed-off-by: default avatarJiri Pirko <jiri@mellanox.com>
Acked-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a882d20c

include/net/netevent.h

+1 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ enum netevent_notif_type { 
	NETEVENT_NEIGH_UPDATE = 1, /* arg is struct neighbour ptr */

	NETEVENT_REDIRECT,	   /* arg is struct netevent_redirect ptr */

	NETEVENT_DELAY_PROBE_TIME_UPDATE, /* arg is struct neigh_parms ptr */

	NETEVENT_MULTIPATH_HASH_UPDATE, /* arg is struct net ptr */

};



int register_netevent_notifier(struct notifier_block *nb);

net/ipv4/sysctl_net_ipv4.c

+19 −1
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ 
#include <net/inet_frag.h>

#include <net/ping.h>

#include <net/protocol.h>

#include <net/netevent.h>



static int zero;

static int one = 1;
@@ -385,6 +386,23 @@ static int proc_tcp_available_ulp(struct ctl_table *ctl, 
	return ret;

}



#ifdef CONFIG_IP_ROUTE_MULTIPATH

static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,

					  void __user *buffer, size_t *lenp,

					  loff_t *ppos)

{

	struct net *net = container_of(table->data, struct net,

	    ipv4.sysctl_fib_multipath_hash_policy);

	int ret;



	ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);

	if (write && ret == 0)

		call_netevent_notifiers(NETEVENT_MULTIPATH_HASH_UPDATE, net);



	return ret;

}

#endif



static struct ctl_table ipv4_table[] = {

	{

		.procname	= "tcp_max_orphans",
@@ -907,7 +925,7 @@ static struct ctl_table ipv4_net_table[] = { 
		.data		= &init_net.ipv4.sysctl_fib_multipath_hash_policy,

		.maxlen		= sizeof(int),

		.mode		= 0644,

		.proc_handler	= proc_dointvec_minmax,

		.proc_handler	= proc_fib_multipath_hash_policy,

		.extra1		= &zero,

		.extra2		= &one,

	},