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net: introduce per-netns netdevice notifiers

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Often the code for example in drivers is interested in getting notifier
call only from certain network namespace. In addition to the existing
global netdevice notifier chain introduce per-netns chains and allow
users to register to that. Eventually this would eliminate unnecessary
overhead in case there are many netdevices in many network namespaces.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko
2019-09-30 10:15:10 +02:00
committed by David S. Miller
parent afa0df5998
commit a30c7b429f
3 changed files with 93 additions and 0 deletions
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3
include/net/net_namespace.h
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@@ -36,6 +36,7 @@
#include <linux/ns_common.h>
#include <linux/idr.h>
#include <linux/skbuff.h>
#include <linux/notifier.h>
struct user_namespace;
struct proc_dir_entry;
@@ -96,6 +97,8 @@ struct net {
struct list_head dev_base_head;
struct hlist_head *dev_name_head;
struct hlist_head *dev_index_head;
struct raw_notifier_head netdev_chain;
unsigned int dev_base_seq; /* protected by rtnl_mutex */
int ifindex;
unsigned int dev_unreg_count;