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authorIdo Schimmel <idosch@mellanox.com>2016-08-25 19:42:37 +0300
committerDavid S. Miller <davem@davemloft.net>2016-08-26 23:13:36 +0300
commit6bc506b4fb065eac3d89ca1ce37082e174493d9e (patch)
treeb2ce45bcdf47c388d9d0977af7bf511685a00e6e /net/bridge/br_forward.c
parent5c326ab49e5ee014ba5314c076fe9b93fd8b0406 (diff)
downloadlinux-6bc506b4fb065eac3d89ca1ce37082e174493d9e.tar.xz
bridge: switchdev: Add forward mark support for stacked devices
switchdev_port_fwd_mark_set() is used to set the 'offload_fwd_mark' of port netdevs so that packets being flooded by the device won't be flooded twice. It works by assigning a unique identifier (the ifindex of the first bridge port) to bridge ports sharing the same parent ID. This prevents packets from being flooded twice by the same switch, but will flood packets through bridge ports belonging to a different switch. This method is problematic when stacked devices are taken into account, such as VLANs. In such cases, a physical port netdev can have upper devices being members in two different bridges, thus requiring two different 'offload_fwd_mark's to be configured on the port netdev, which is impossible. The main problem is that packet and netdev marking is performed at the physical netdev level, whereas flooding occurs between bridge ports, which are not necessarily port netdevs. Instead, packet and netdev marking should really be done in the bridge driver with the switch driver only telling it which packets it already forwarded. The bridge driver will mark such packets using the mark assigned to the ingress bridge port and will prevent the packet from being forwarded through any bridge port sharing the same mark (i.e. having the same parent ID). Remove the current switchdev 'offload_fwd_mark' implementation and instead implement the proposed method. In addition, make rocker - the sole user of the mark - use the proposed method. Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bridge/br_forward.c')
-rw-r--r--net/bridge/br_forward.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
index 63a83d8d7da3..32a02de39cd2 100644
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -29,7 +29,8 @@ static inline int should_deliver(const struct net_bridge_port *p,
vg = nbp_vlan_group_rcu(p);
return ((p->flags & BR_HAIRPIN_MODE) || skb->dev != p->dev) &&
- br_allowed_egress(vg, skb) && p->state == BR_STATE_FORWARDING;
+ br_allowed_egress(vg, skb) && p->state == BR_STATE_FORWARDING &&
+ nbp_switchdev_allowed_egress(p, skb);
}
int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb)