[PATCH iwl-net] ice: fix FDB deletion

[Aleksandr Loktionov <aleksandr.loktionov@intel.com>]

From: Jakub Staniszewski <jakub.staniszewski@intel.com>

Correct the logic in ndo_fdb_del() to align with other drivers in
upstream. The condition was inverted — it was rejecting permanent
(NUD_PERMANENT) MAC addresses while allowing non-permanent ones to be
deleted, which is the opposite of the intended behavior.

The correct logic is to reject deletion of non-permanent entries,
mirroring the fix applied to ndo_dflt_fdb_del() in commit 645359930231
("rtnetlink: Fix inverted check in ndo_dflt_fdb_del()").

Also add is_link_local_ether_addr() to the unicast branch of
ice_fdb_del() to mirror ice_fdb_add(), which already handles link-local
addresses as unicast via dev_uc_add_excl(). Without this, a link-local
address added via ice_fdb_add() would fall through to dev_mc_del() on
deletion and fail to be removed.

Fixes: e94d4478669357cd ("ice: Implement filter sync, NDO operations and bump version")
Cc: stable@vger.kernel.org
Signed-off-by: Jakub Staniszewski <jakub.staniszewski@intel.com>
Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index d888354..4c6d863 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -6151,12 +6151,12 @@ ice_fdb_del(struct ndmsg *ndm, __always_unused struct nlattr *tb[],
 {
 	int err;
 
-	if (ndm->ndm_state & NUD_PERMANENT) {
+	if (!(ndm->ndm_state & NUD_PERMANENT)) {
 		netdev_err(dev, "FDB only supports static addresses\n");
 		return -EINVAL;
 	}
 
-	if (is_unicast_ether_addr(addr))
+	if (is_unicast_ether_addr(addr) || is_link_local_ether_addr(addr))
 		err = dev_uc_del(dev, addr);
 	else if (is_multicast_ether_addr(addr))
 		err = dev_mc_del(dev, addr);
-- 
2.52.0