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net: dsa: tag_sja1105: fix MAC DA patching from meta frames 

[ Upstream commit 1dcf6efd5f ]

The SJA1105 manual says that at offset 4 into the meta frame payload we
have "MAC destination byte 2" and at offset 5 we have "MAC destination
byte 1". These are counted from the LSB, so byte 1 is h_dest[ETH_HLEN-2]
aka h_dest[4] and byte 2 is h_dest[ETH_HLEN-3] aka h_dest[3].

The sja1105_meta_unpack() function decodes these the other way around,
so a frame with MAC DA 01:80:c2:11:22:33 is received by the network
stack as having 01:80:c2:22:11:33.

Fixes: e53e18a6fe ("net: dsa: sja1105: Receive and decode meta frames")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Vladimir Oltean 2023-07-04 01:05:44 +03:00 committed by Greg Kroah-Hartman
parent 67a67e2584
commit 58b1b3c54e
1 changed files with 2 additions and 2 deletions
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4
net/dsa/tag_sja1105.c
View File

@ -48,8 +48,8 @@ static void sja1105_meta_unpack(const struct sk_buff *skb,
* a unified unpacking command for both device series.
*/
packing(buf, &meta->tstamp, 31, 0, 4, UNPACK, 0);
packing(buf + 4, &meta->dmac_byte_4, 7, 0, 1, UNPACK, 0);
packing(buf + 5, &meta->dmac_byte_3, 7, 0, 1, UNPACK, 0);
packing(buf + 4, &meta->dmac_byte_3, 7, 0, 1, UNPACK, 0);
packing(buf + 5, &meta->dmac_byte_4, 7, 0, 1, UNPACK, 0);
packing(buf + 6, &meta->source_port, 7, 0, 1, UNPACK, 0);
packing(buf + 7, &meta->switch_id, 7, 0, 1, UNPACK, 0);
}