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 21bffde6e4bf1043c65eeef86f206c592e987eb7..76d55a80f3b967c203c8ff8617a248c67825859d 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: