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Commit 79fa7061 authored by Vladimir Oltean's avatar Vladimir Oltean Committed by David S. Miller
Browse files

net: dsa: sja1105: Make sja1105_is_link_local not match meta frames 



Although meta frames are configured to be sent at SJA1105_META_DMAC
(01-80-C2-00-00-0E) which is a multicast MAC address that would also be
trapped by the switch to the CPU, were it to receive it on a front-panel
port, meta frames are conceptually not link-local frames, they only
carry their RX timestamps.

The choice of sending meta frames at a multicast DMAC is a pragmatic
one, to avoid installing an extra entry to the DSA master port's
multicast MAC filter.

Signed-off-by: default avatarVladimir Oltean <olteanv@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 24c01949

net/dsa/tag_sja1105.c

+2 −0
Original line number Diff line number Diff line
@@ -13,6 +13,8 @@ static inline bool sja1105_is_link_local(const struct sk_buff *skb) 
	const struct ethhdr *hdr = eth_hdr(skb);

	u64 dmac = ether_addr_to_u64(hdr->h_dest);



	if (ntohs(hdr->h_proto) == ETH_P_SJA1105_META)

		return false;

	if ((dmac & SJA1105_LINKLOCAL_FILTER_A_MASK) ==

		    SJA1105_LINKLOCAL_FILTER_A)

		return true;