net: dsa: Fix duplicate frames flooded by learning

[ Upstream commit 0e62f543bed03a64495bd2651d4fe1aa4bcb7fe5 ]

When both the switch and the bridge are learning about new addresses,
switch ports attached to the bridge would see duplicate ARP frames
because both entities would attempt to send them.

Fixes: 5037d532b83d ("net: dsa: add Broadcom tag RX/TX handler")
Reported-by: Maxime Bizon <mbizon@freebox.fr>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/dsa/tag_brcm.c b/net/dsa/tag_brcm.c
index e2aadb73111d544c1ce16db13bfd99c7506642fc..657f7b1af315086d7e11c3da750828f16fd8078b 100644 (file)
--- a/net/dsa/tag_brcm.c
+++ b/net/dsa/tag_brcm.c
@@ -84,6 +84,8 @@ static struct sk_buff *brcm_tag_xmit(struct sk_buff *skb, struct net_device *dev
                brcm_tag[2] = BRCM_IG_DSTMAP2_MASK;
        brcm_tag[3] = (1 << p->port) & BRCM_IG_DSTMAP1_MASK;
 
+       skb->offload_fwd_mark = 1;
+
        return skb;
 
 out_free: