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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: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vladimir Oltean 2019-06-08 15:04:38 +03:00 committed by David S. Miller
parent 24c01949e5
commit 79fa706139
1 changed files with 2 additions and 0 deletions
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2
net/dsa/tag_sja1105.c
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@ -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;