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 2b06bb91318b7135a93c7cae4ddef0e5ebcbba56..2709bddef7d5a6f5d6f5dcc98dc74bbbd8be34c0 100644 (file)
--- a/net/dsa/tag_brcm.c
+++ b/net/dsa/tag_brcm.c
@@ -141,6 +141,8 @@ static struct sk_buff *brcm_tag_rcv_ll(struct sk_buff *skb,
        /* Remove Broadcom tag and update checksum */
        skb_pull_rcsum(skb, BRCM_TAG_LEN);
 
+       skb->offload_fwd_mark = 1;
+
        return skb;
 }