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| author | Eric Dumazet <edumazet@google.com> | 2013-02-05 20:22:50 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-02-06 15:59:47 -0500 |
| commit | cd431e738509e74726055390c9e5e81e8e7e03ec (patch) | |
| tree | f5efeea14ae9aa00bb18cf96dc357c73a34d6b0a /drivers/net/macvlan.c | |
| parent | 6d1ccff627806829c46091bd9d9835302a3fbf5f (diff) | |
| download | lwn-cd431e738509e74726055390c9e5e81e8e7e03ec.tar.gz lwn-cd431e738509e74726055390c9e5e81e8e7e03ec.zip | |
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>
Diffstat (limited to 'drivers/net/macvlan.c')
| -rw-r--r-- | drivers/net/macvlan.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c index 7b44ebd7770e..f494da82c33f 100644 --- a/drivers/net/macvlan.c +++ b/drivers/net/macvlan.c @@ -29,6 +29,7 @@ #include <linux/if_vlan.h> #include <linux/if_link.h> #include <linux/if_macvlan.h> +#include <linux/hash.h> #include <net/rtnetlink.h> #include <net/xfrm.h> @@ -126,6 +127,13 @@ static int macvlan_broadcast_one(struct sk_buff *skb, return vlan->receive(skb); } +static unsigned int mc_hash(const unsigned char *addr) +{ + u32 val = __get_unaligned_cpu32(addr + 2); + + return hash_32(val, MACVLAN_MC_FILTER_BITS); +} + static void macvlan_broadcast(struct sk_buff *skb, const struct macvlan_port *port, struct net_device *src, @@ -137,6 +145,7 @@ static void macvlan_broadcast(struct sk_buff *skb, struct sk_buff *nskb; unsigned int i; int err; + unsigned int hash = mc_hash(eth->h_dest); if (skb->protocol == htons(ETH_P_PAUSE)) return; @@ -146,6 +155,8 @@ static void macvlan_broadcast(struct sk_buff *skb, if (vlan->dev == src || !(vlan->mode & mode)) continue; + if (!test_bit(hash, vlan->mc_filter)) + continue; nskb = skb_clone(skb, GFP_ATOMIC); err = macvlan_broadcast_one(nskb, vlan, eth, mode == MACVLAN_MODE_BRIDGE); @@ -405,6 +416,18 @@ static void macvlan_set_mac_lists(struct net_device *dev) { struct macvlan_dev *vlan = netdev_priv(dev); + if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { + bitmap_fill(vlan->mc_filter, MACVLAN_MC_FILTER_SZ); + } else { + struct netdev_hw_addr *ha; + DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ); + + bitmap_zero(filter, MACVLAN_MC_FILTER_SZ); + netdev_for_each_mc_addr(ha, dev) { + __set_bit(mc_hash(ha->addr), filter); + } + bitmap_copy(vlan->mc_filter, filter, MACVLAN_MC_FILTER_SZ); + } dev_uc_sync(vlan->lowerdev, dev); dev_mc_sync(vlan->lowerdev, dev); } |