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authorVladimir Oltean <vladimir.oltean@nxp.com>2021-07-30 20:18:13 +0300
committerDavid S. Miller <davem@davemloft.net>2021-08-02 16:28:28 +0300
commit728db843df88753aeb7224314807a203afa8eb32 (patch)
tree44054f8763defbf86048c6299208236baf088688 /drivers
parent6c5fc159e0927531707895709eee1f8bfa04289f (diff)
downloadlinux-728db843df88753aeb7224314807a203afa8eb32.tar.xz
net: dsa: sja1105: ignore the FDB entry for unknown multicast when adding a new address
Currently, when sja1105pqrs_fdb_add() is called for a host-joined IPv6 MDB entry such as 33:33:00:00:00:6a, the search for that address will return the FDB entry for SJA1105_UNKNOWN_MULTICAST, which has a destination MAC of 01:00:00:00:00:00 and a mask of 01:00:00:00:00:00. It returns that entry because, well, it matches, in the sense that unknown multicast is supposed by design to match it... But the issue is that we then proceed to overwrite this entry with the one for our precise host-joined multicast address, and the unknown multicast entry is no longer there - unknown multicast is now flooded to the same group of ports as broadcast, which does not look up the FDB. To solve this problem, we should ignore searches that return the unknown multicast address as the match, and treat them as "no match" which will result in the entry being installed to hardware. For this to work properly, we need to put the result of the FDB search in a temporary variable in order to avoid overwriting the l2_lookup entry we want to program. The l2_lookup entry returned by the search might not have the same set of DESTPORTS and not even the same MACADDR as the entry we're trying to add. Fixes: 4d9423549501 ("net: dsa: sja1105: offload bridge port flags to device") Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/dsa/sja1105/sja1105_main.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index 5a4c7789ca43..5d8739b30d8c 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -1456,14 +1456,19 @@ int sja1105pqrs_fdb_add(struct dsa_switch *ds, int port,
}
l2_lookup.destports = BIT(port);
+ tmp = l2_lookup;
+
rc = sja1105_dynamic_config_read(priv, BLK_IDX_L2_LOOKUP,
- SJA1105_SEARCH, &l2_lookup);
- if (rc == 0) {
+ SJA1105_SEARCH, &tmp);
+ if (rc == 0 && tmp.index != SJA1105_MAX_L2_LOOKUP_COUNT - 1) {
/* Found a static entry and this port is already in the entry's
* port mask => job done
*/
- if ((l2_lookup.destports & BIT(port)) && l2_lookup.lockeds)
+ if ((tmp.destports & BIT(port)) && tmp.lockeds)
return 0;
+
+ l2_lookup = tmp;
+
/* l2_lookup.index is populated by the switch in case it
* found something.
*/