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authorEgil Hjelmeland <privat@egil-hjelmeland.no>2017-11-10 12:54:35 +0100
committerDavid S. Miller <davem@davemloft.net>2017-11-11 21:50:14 +0900
commit4672cd36053e4a8480f7ca796758d56ef23ccb78 (patch)
tree7aae1b637fe1a69a312243476657dcd9917ec370 /net/dsa
parent2aee43078afc24fe8073829159292664c1eed424 (diff)
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net: dsa: lan9303: Clear offload_fwd_mark for IGMP
Now that IGMP packets no longer is flooded in HW, we want the SW bridge to forward packets based on bridge configuration. To make that happen, IGMP packets must have skb->offload_fwd_mark = 0. Signed-off-by: Egil Hjelmeland <privat@egil-hjelmeland.no> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dsa')
-rw-r--r--net/dsa/tag_lan9303.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/net/dsa/tag_lan9303.c b/net/dsa/tag_lan9303.c
index 5ba01fc3c6ba..b8c5e52b2eff 100644
--- a/net/dsa/tag_lan9303.c
+++ b/net/dsa/tag_lan9303.c
@@ -92,6 +92,8 @@ static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev,
{
u16 *lan9303_tag;
unsigned int source_port;
+ u16 ether_type_nw;
+ u8 ip_protocol;
if (unlikely(!pskb_may_pull(skb, LAN9303_TAG_LEN))) {
dev_warn_ratelimited(&dev->dev,
@@ -129,6 +131,17 @@ static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev,
skb->offload_fwd_mark = !ether_addr_equal(skb->data - ETH_HLEN,
eth_stp_addr);
+ /* We also need IGMP packets to have skb->offload_fwd_mark = 0.
+ * Solving this for all conceivable situations would add more cost to
+ * every packet. Instead we handle just the common case:
+ * No VLAN tag + Ethernet II framing.
+ * Test least probable term first.
+ */
+ ether_type_nw = lan9303_tag[2];
+ ip_protocol = *(skb->data + 9);
+ if (ip_protocol == IPPROTO_IGMP && ether_type_nw == htons(ETH_P_IP))
+ skb->offload_fwd_mark = 0;
+
return skb;
}