Merge branch 'mlxsw-Two-small-updates'

Ido Schimmel says:

====================
mlxsw: Two small updates

Patch #1 from Petr handles a corner case in GRE tunnel offload.

Patch #2 from Amit fixes a recent issue where the driver was programming
the device to use an adjacency index (for a nexthop) that was not
properly initialized.
====================
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>

drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c

@@ -1614,8 +1614,25 @@ static int
 mlxsw_sp_netdevice_ipip_ul_vrf_event(struct mlxsw_sp *mlxsw_sp,
 				     struct mlxsw_sp_ipip_entry *ipip_entry,
 				     struct net_device *ul_dev,
+				     bool *demote_this,
 				     struct netlink_ext_ack *extack)
 {
+	u32 ul_tb_id = l3mdev_fib_table(ul_dev) ? : RT_TABLE_MAIN;
+	enum mlxsw_sp_l3proto ul_proto;
+	union mlxsw_sp_l3addr saddr;
+
+	/* Moving underlay to a different VRF might cause local address
+	 * conflict, and the conflicting tunnels need to be demoted.
+	 */
+	ul_proto = mlxsw_sp->router->ipip_ops_arr[ipip_entry->ipipt]->ul_proto;
+	saddr = mlxsw_sp_ipip_netdev_saddr(ul_proto, ipip_entry->ol_dev);
+	if (mlxsw_sp_ipip_demote_tunnel_by_saddr(mlxsw_sp, ul_proto,
+						 saddr, ul_tb_id,
+						 ipip_entry)) {
+		*demote_this = true;
+		return 0;
+	}
+
 	return __mlxsw_sp_ipip_entry_update_tunnel(mlxsw_sp, ipip_entry,
 						   true, true, false, extack);
 }
@@ -1766,6 +1783,7 @@ static int
 __mlxsw_sp_netdevice_ipip_ul_event(struct mlxsw_sp *mlxsw_sp,
 				   struct mlxsw_sp_ipip_entry *ipip_entry,
 				   struct net_device *ul_dev,
+				   bool *demote_this,
 				   unsigned long event,
 				   struct netdev_notifier_info *info)
 {
@@ -1780,6 +1798,7 @@ __mlxsw_sp_netdevice_ipip_ul_event(struct mlxsw_sp *mlxsw_sp,
 			return mlxsw_sp_netdevice_ipip_ul_vrf_event(mlxsw_sp,
 								    ipip_entry,
 								    ul_dev,
+								    demote_this,
 								    extack);
 		break;
 
@@ -1806,13 +1825,31 @@ mlxsw_sp_netdevice_ipip_ul_event(struct mlxsw_sp *mlxsw_sp,
 	while ((ipip_entry = mlxsw_sp_ipip_entry_find_by_ul_dev(mlxsw_sp,
 								ul_dev,
 								ipip_entry))) {
+		struct mlxsw_sp_ipip_entry *prev;
+		bool demote_this = false;
+
 		err = __mlxsw_sp_netdevice_ipip_ul_event(mlxsw_sp, ipip_entry,
-							 ul_dev, event, info);
+							 ul_dev, &demote_this,
+							 event, info);
 		if (err) {
 			mlxsw_sp_ipip_demote_tunnel_by_ul_netdev(mlxsw_sp,
 								 ul_dev);
 			return err;
 		}
+
+		if (demote_this) {
+			if (list_is_first(&ipip_entry->ipip_list_node,
+					  &mlxsw_sp->router->ipip_list))
+				prev = NULL;
+			else
+				/* This can't be cached from previous iteration,
+				 * because that entry could be gone now.
+				 */
+				prev = list_prev_entry(ipip_entry,
+						       ipip_list_node);
+			mlxsw_sp_ipip_entry_demote_tunnel(mlxsw_sp, ipip_entry);
+			ipip_entry = prev;
+		}
 	}
 
 	return 0;
@@ -4184,7 +4221,6 @@ mlxsw_sp_fib_entry_ralue_pack(char *ralue_pl,
 
 static int mlxsw_sp_adj_discard_write(struct mlxsw_sp *mlxsw_sp, u16 rif_index)
 {
-	u32 adj_discard_index = mlxsw_sp->router->adj_discard_index;
 	enum mlxsw_reg_ratr_trap_action trap_action;
 	char ratr_pl[MLXSW_REG_RATR_LEN];
 	int err;
@@ -4199,8 +4235,8 @@ static int mlxsw_sp_adj_discard_write(struct mlxsw_sp *mlxsw_sp, u16 rif_index)
 
 	trap_action = MLXSW_REG_RATR_TRAP_ACTION_DISCARD_ERRORS;
 	mlxsw_reg_ratr_pack(ratr_pl, MLXSW_REG_RATR_OP_WRITE_WRITE_ENTRY, true,
-			    MLXSW_REG_RATR_TYPE_ETHERNET, adj_discard_index,
-			    rif_index);
+			    MLXSW_REG_RATR_TYPE_ETHERNET,
+			    mlxsw_sp->router->adj_discard_index, rif_index);
 	mlxsw_reg_ratr_trap_action_set(ratr_pl, trap_action);
 	err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ratr), ratr_pl);
 	if (err)