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authorVladimir Oltean <vladimir.oltean@nxp.com>2020-09-26 22:32:03 +0300
committerDavid S. Miller <davem@davemloft.net>2020-09-26 14:17:58 -0700
commit707091eb26338c0d621171a8332fed11257a63f7 (patch)
tree70e4b28e3c61918ec3228560199efbbae3169e7b /net/dsa
parentc3975400c8014e39f7f272808377c97c906c8cee (diff)
net: dsa: tag_sja1105: request promiscuous mode for master
Currently PTP is broken when ports are in standalone mode (the tagger keeps printing this message): sja1105 spi0.1: Expected meta frame, is 01-80-c2-00-00-0e in the DSA master multicast filter? Sure, one might say "simply add 01-80-c2-00-00-0e to the master's RX filter" but things become more complicated because: - Actually all frames in the 01-80-c2-xx-xx-xx and 01-1b-19-xx-xx-xx range are trapped to the CPU automatically - The switch mangles bytes 3 and 4 of the MAC address via the incl_srcpt ("include source port [in the DMAC]") option, which is how source port and switch id identification is done for link-local traffic on RX. But this means that an address installed to the RX filter would, at the end of the day, not correspond to the final address seen by the DSA master. Assume RX filtering lists on DSA masters are typically too small to include all necessary addresses for PTP to work properly on sja1105, and just request promiscuous mode unconditionally. Just an example: Assuming the following addresses are trapped to the CPU: 01-80-c2-00-00-00 to 01-80-c2-00-00-ff 01-1b-19-00-00-00 to 01-1b-19-00-00-ff These are 512 addresses. Now let's say this is a board with 3 switches, and 4 ports per switch. The 512 addresses become 6144 addresses that must be managed by the DSA master's RX filtering lists. This may be refined in the future, but for now, it is simply not worth it to add the additional addresses to the master's RX filter, so simply request it to become promiscuous as soon as the driver probes. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dsa')
-rw-r--r--net/dsa/tag_sja1105.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/dsa/tag_sja1105.c b/net/dsa/tag_sja1105.c
index 3710f9daa46d..36ebd5878061 100644
--- a/net/dsa/tag_sja1105.c
+++ b/net/dsa/tag_sja1105.c
@@ -353,6 +353,7 @@ static const struct dsa_device_ops sja1105_netdev_ops = {
.rcv = sja1105_rcv,
.filter = sja1105_filter,
.overhead = VLAN_HLEN,
+ .promisc_on_master = true,
};
MODULE_LICENSE("GPL v2");