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authorPavel Emelyanov <xemul@parallels.com>2012-08-08 21:53:19 +0000
committerDavid S. Miller <davem@davemloft.net>2012-08-09 16:18:07 -0700
commitaa79e66eee5d525e2fcbd2a5fcb87ae3dd4aa9e9 (patch)
treefd275880600683733adcb1d84477ea35a04dd901 /include/net/net_namespace.h
parente6f8f1a739b652c56e6f959d6714d92e05621e21 (diff)
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net: Make ifindex generation per-net namespace
Strictly speaking this is only _really_ required for checkpoint-restore to make loopback device always have the same index. This change appears to be safe wrt "ifindex should be unique per-system" concept, as all the ifindex usage is either already made per net namespace of is explicitly limited with init_net only. There are two cool side effects of this. The first one -- ifindices of devices in container are always small, regardless of how many containers we've started (and re-started) so far. The second one is -- we can speed up the loopback ifidex access as shown in the next patch. v2: Place ifindex right after dev_base_seq : avoid two holes and use the same cache line, dirtied in list_netdevice()/unlist_netdevice() Signed-off-by: Pavel Emelyanov <xemul@parallels.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/net_namespace.h')
-rw-r--r--include/net/net_namespace.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index ae1cd6c..6dc3db3 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -66,6 +66,7 @@ struct net {
struct hlist_head *dev_name_head;
struct hlist_head *dev_index_head;
unsigned int dev_base_seq; /* protected by rtnl_mutex */
+ int ifindex;
/* core fib_rules */
struct list_head rules_ops;
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