macvlan: add multicast filter
Setting up IPv6 addresses on configurations with many macvlans
is not really working, as many multicast messages are dropped.
Add a multicast filter to macvlan to reduce the amount of cloned
skbs and overhead.
Successfully tested with 1024 macvlans on one ethernet device.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Ben Greear <greearb@candelatech.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/if_macvlan.h b/include/linux/if_macvlan.h
index f65e8d2..84dde1d 100644
--- a/include/linux/if_macvlan.h
+++ b/include/linux/if_macvlan.h
@@ -52,6 +52,9 @@
*/
#define MAX_MACVTAP_QUEUES (NR_CPUS < 16 ? NR_CPUS : 16)
+#define MACVLAN_MC_FILTER_BITS 8
+#define MACVLAN_MC_FILTER_SZ (1 << MACVLAN_MC_FILTER_BITS)
+
struct macvlan_dev {
struct net_device *dev;
struct list_head list;
@@ -59,6 +62,9 @@
struct macvlan_port *port;
struct net_device *lowerdev;
struct macvlan_pcpu_stats __percpu *pcpu_stats;
+
+ DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
+
enum macvlan_mode mode;
u16 flags;
int (*receive)(struct sk_buff *skb);