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authorMahesh Bandewar <maheshb@google.com>2015-05-05 03:06:11 +0300
committerDavid S. Miller <davem@davemloft.net>2015-05-06 02:29:49 +0300
commitf631c44bbe1581d18d0aba628b3802d0eacb6373 (patch)
treead5402d0f33bfdff1e446bdb135ea20a7747c5e4 /drivers/net/ipvlan
parentba35f8588f474d5bf8988615b04ee722a2684fd2 (diff)
downloadlinux-f631c44bbe1581d18d0aba628b3802d0eacb6373.tar.xz
ipvlan: Always set broadcast bit in multicast filter
Earlier tricks of setting broadcast bit only when IPv4 address is added onto interface are not good enough especially when autoconf comes in play. Setting them on always is performance drag but now that multicast / broadcast is not processed in fast-path; enabling broadcast will let autoconf work correctly without affecting performance characteristics of the device. Signed-off-by: Mahesh Bandewar <maheshb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ipvlan')
-rw-r--r--drivers/net/ipvlan/ipvlan_main.c20
1 files changed, 6 insertions, 14 deletions
diff --git a/drivers/net/ipvlan/ipvlan_main.c b/drivers/net/ipvlan/ipvlan_main.c
index a16d3017fdc3..1acc283160d9 100644
--- a/drivers/net/ipvlan/ipvlan_main.c
+++ b/drivers/net/ipvlan/ipvlan_main.c
@@ -218,17 +218,6 @@ static void ipvlan_change_rx_flags(struct net_device *dev, int change)
dev_set_allmulti(phy_dev, dev->flags & IFF_ALLMULTI? 1 : -1);
}
-static void ipvlan_set_broadcast_mac_filter(struct ipvl_dev *ipvlan, bool set)
-{
- struct net_device *dev = ipvlan->dev;
- unsigned int hashbit = ipvlan_mac_hash(dev->broadcast);
-
- if (set && !test_bit(hashbit, ipvlan->mac_filters))
- __set_bit(hashbit, ipvlan->mac_filters);
- else if (!set && test_bit(hashbit, ipvlan->mac_filters))
- __clear_bit(hashbit, ipvlan->mac_filters);
-}
-
static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
{
struct ipvl_dev *ipvlan = netdev_priv(dev);
@@ -243,6 +232,12 @@ static void ipvlan_set_multicast_mac_filter(struct net_device *dev)
netdev_for_each_mc_addr(ha, dev)
__set_bit(ipvlan_mac_hash(ha->addr), mc_filters);
+ /* Turn-on broadcast bit irrespective of address family,
+ * since broadcast is deferred to a work-queue, hence no
+ * impact on fast-path processing.
+ */
+ __set_bit(ipvlan_mac_hash(dev->broadcast), mc_filters);
+
bitmap_copy(ipvlan->mac_filters, mc_filters,
IPVLAN_MAC_FILTER_SIZE);
}
@@ -710,7 +705,6 @@ static int ipvlan_add_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
*/
if (netif_running(ipvlan->dev))
ipvlan_ht_addr_add(ipvlan, addr);
- ipvlan_set_broadcast_mac_filter(ipvlan, true);
return 0;
}
@@ -727,8 +721,6 @@ static void ipvlan_del_addr4(struct ipvl_dev *ipvlan, struct in_addr *ip4_addr)
list_del(&addr->anode);
ipvlan->ipv4cnt--;
WARN_ON(ipvlan->ipv4cnt < 0);
- if (!ipvlan->ipv4cnt)
- ipvlan_set_broadcast_mac_filter(ipvlan, false);
kfree_rcu(addr, rcu);
return;