From: Ido Schimmel <idosch@mellanox.com>
Date: Tue, 18 Jul 2017 10:10:25 +0200
Subject: mlxsw: spectrum_router: Set abort trap for IPv6
Patch-mainline: v4.14-rc1
Git-commit: bc65a8a4f4d214c30c21cba90607c93ac676f6cf
References: bsc#1112374

When we fail to insert a route we invoke the abort mechanism which
flushes all the tables and inserts a default route in each, so that all
packets incoming to the router will be trapped to the CPU.

Upon abort, add an IPv6 default route to the IPv6 tables.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c |   39 ++++++++++++------
 1 file changed, 26 insertions(+), 13 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -2817,19 +2817,20 @@ static void mlxsw_sp_router_fib4_del(str
 	mlxsw_sp_fib_node_put(mlxsw_sp, fib_node);
 }
 
-static int mlxsw_sp_router_set_abort_trap(struct mlxsw_sp *mlxsw_sp)
+static int __mlxsw_sp_router_set_abort_trap(struct mlxsw_sp *mlxsw_sp,
+					    enum mlxsw_reg_ralxx_protocol proto,
+					    u8 tree_id)
 {
 	char ralta_pl[MLXSW_REG_RALTA_LEN];
 	char ralst_pl[MLXSW_REG_RALST_LEN];
 	int i, err;
 
-	mlxsw_reg_ralta_pack(ralta_pl, true, MLXSW_REG_RALXX_PROTOCOL_IPV4,
-			     MLXSW_SP_LPM_TREE_MIN);
+	mlxsw_reg_ralta_pack(ralta_pl, true, proto, tree_id);
 	err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ralta), ralta_pl);
 	if (err)
 		return err;
 
-	mlxsw_reg_ralst_pack(ralst_pl, 0xff, MLXSW_SP_LPM_TREE_MIN);
+	mlxsw_reg_ralst_pack(ralst_pl, 0xff, tree_id);
 	err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ralst), ralst_pl);
 	if (err)
 		return err;
@@ -2842,17 +2843,14 @@ static int mlxsw_sp_router_set_abort_tra
 		if (!mlxsw_sp_vr_is_used(vr))
 			continue;
 
-		mlxsw_reg_raltb_pack(raltb_pl, vr->id,
-				     MLXSW_REG_RALXX_PROTOCOL_IPV4,
-				     MLXSW_SP_LPM_TREE_MIN);
+		mlxsw_reg_raltb_pack(raltb_pl, vr->id, proto, tree_id);
 		err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(raltb),
 				      raltb_pl);
 		if (err)
 			return err;
 
-		mlxsw_reg_ralue_pack4(ralue_pl, MLXSW_SP_L3_PROTO_IPV4,
-				      MLXSW_REG_RALUE_OP_WRITE_WRITE, vr->id, 0,
-				      0);
+		mlxsw_reg_ralue_pack(ralue_pl, proto,
+				     MLXSW_REG_RALUE_OP_WRITE_WRITE, vr->id, 0);
 		mlxsw_reg_ralue_act_ip2me_pack(ralue_pl);
 		err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(ralue),
 				      ralue_pl);
@@ -2863,6 +2861,21 @@ static int mlxsw_sp_router_set_abort_tra
 	return 0;
 }
 
+static int mlxsw_sp_router_set_abort_trap(struct mlxsw_sp *mlxsw_sp)
+{
+	enum mlxsw_reg_ralxx_protocol proto = MLXSW_REG_RALXX_PROTOCOL_IPV4;
+	int err;
+
+	err = __mlxsw_sp_router_set_abort_trap(mlxsw_sp, proto,
+					       MLXSW_SP_LPM_TREE_MIN);
+	if (err)
+		return err;
+
+	proto = MLXSW_REG_RALXX_PROTOCOL_IPV6;
+	return __mlxsw_sp_router_set_abort_trap(mlxsw_sp, proto,
+						MLXSW_SP_LPM_TREE_MIN + 1);
+}
+
 static void mlxsw_sp_fib4_node_flush(struct mlxsw_sp *mlxsw_sp,
 				     struct mlxsw_sp_fib_node *fib_node)
 {
@@ -2932,7 +2945,7 @@ static void mlxsw_sp_router_fib_flush(st
 	}
 }
 
-static void mlxsw_sp_router_fib4_abort(struct mlxsw_sp *mlxsw_sp)
+static void mlxsw_sp_router_fib_abort(struct mlxsw_sp *mlxsw_sp)
 {
 	int err;
 
@@ -2977,7 +2990,7 @@ static void mlxsw_sp_router_fib_event_wo
 		err = mlxsw_sp_router_fib4_add(mlxsw_sp, &fib_work->fen_info,
 					       replace, append);
 		if (err)
-			mlxsw_sp_router_fib4_abort(mlxsw_sp);
+			mlxsw_sp_router_fib_abort(mlxsw_sp);
 		fib_info_put(fib_work->fen_info.fi);
 		break;
 	case FIB_EVENT_ENTRY_DEL:
@@ -2988,7 +3001,7 @@ static void mlxsw_sp_router_fib_event_wo
 	case FIB_EVENT_RULE_DEL:
 		rule = fib_work->fr_info.rule;
 		if (!fib4_rule_default(rule) && !rule->l3mdev)
-			mlxsw_sp_router_fib4_abort(mlxsw_sp);
+			mlxsw_sp_router_fib_abort(mlxsw_sp);
 		fib_rule_put(rule);
 		break;
 	case FIB_EVENT_NH_ADD: /* fall through */