mlxsw: spectrum_router: Allow returning errors from mlxsw_sp_nexthop_group_refresh()

The function is responsible for allocating the adjacency entries used by
the nexthop group and populating them with the adjacency information
such as egress RIF and MAC address.

Allow the function to return an error when it encounters a problem and
have the relevant call sites check it.
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -3552,7 +3552,7 @@ mlxsw_sp_nexthop_group_offload_refresh(struct mlxsw_sp *mlxsw_sp,
 	}
 }
 
-static void
+static int
 mlxsw_sp_nexthop_group_refresh(struct mlxsw_sp *mlxsw_sp,
 			       struct mlxsw_sp_nexthop_group *nh_grp)
 {
@@ -3562,13 +3562,12 @@ mlxsw_sp_nexthop_group_refresh(struct mlxsw_sp *mlxsw_sp,
 	bool offload_change = false;
 	u32 adj_index;
 	bool old_adj_index_valid;
+	int i, err2, err = 0;
 	u32 old_adj_index;
-	int i;
-	int err;
 
 	if (!nhgi->gateway) {
 		mlxsw_sp_nexthop_fib_entries_update(mlxsw_sp, nh_grp);
-		return;
+		return 0;
 	}
 
 	for (i = 0; i < nhgi->count; i++) {
@@ -3589,7 +3588,7 @@ mlxsw_sp_nexthop_group_refresh(struct mlxsw_sp *mlxsw_sp,
 			dev_warn(mlxsw_sp->bus_info->dev, "Failed to update neigh MAC in adjacency table.\n");
 			goto set_trap;
 		}
-		return;
+		return 0;
 	}
 	mlxsw_sp_nexthop_group_normalize(nhgi);
 	if (!nhgi->sum_norm_weight)
@@ -3637,7 +3636,7 @@ mlxsw_sp_nexthop_group_refresh(struct mlxsw_sp *mlxsw_sp,
 			dev_warn(mlxsw_sp->bus_info->dev, "Failed to add adjacency index to fib entries.\n");
 			goto set_trap;
 		}
-		return;
+		return 0;
 	}
 
 	err = mlxsw_sp_adj_index_mass_update(mlxsw_sp, nh_grp,
@@ -3649,7 +3648,7 @@ mlxsw_sp_nexthop_group_refresh(struct mlxsw_sp *mlxsw_sp,
 		goto set_trap;
 	}
 
-	return;
+	return 0;
 
 set_trap:
 	old_adj_index_valid = nhgi->adj_index_valid;
@@ -3658,13 +3657,14 @@ mlxsw_sp_nexthop_group_refresh(struct mlxsw_sp *mlxsw_sp,
 		nh = &nhgi->nexthops[i];
 		nh->offloaded = 0;
 	}
-	err = mlxsw_sp_nexthop_fib_entries_update(mlxsw_sp, nh_grp);
-	if (err)
+	err2 = mlxsw_sp_nexthop_fib_entries_update(mlxsw_sp, nh_grp);
+	if (err2)
 		dev_warn(mlxsw_sp->bus_info->dev, "Failed to set traps for fib entries.\n");
 	mlxsw_sp_nexthop_group_offload_refresh(mlxsw_sp, nh_grp);
 	if (old_adj_index_valid)
 		mlxsw_sp_kvdl_free(mlxsw_sp, MLXSW_SP_KVDL_ENTRY_TYPE_ADJ,
 				   nhgi->ecmp_size, nhgi->adj_index);
+	return err;
 }
 
 static void __mlxsw_sp_nexthop_neigh_update(struct mlxsw_sp_nexthop *nh,
@@ -4122,10 +4122,14 @@ mlxsw_sp_nexthop4_group_info_init(struct mlxsw_sp *mlxsw_sp,
 		if (err)
 			goto err_nexthop4_init;
 	}
-	mlxsw_sp_nexthop_group_refresh(mlxsw_sp, nh_grp);
+	err = mlxsw_sp_nexthop_group_refresh(mlxsw_sp, nh_grp);
+	if (err)
+		goto err_group_refresh;
 
 	return 0;
 
+err_group_refresh:
+	i = nhgi->count;
 err_nexthop4_init:
 	for (i--; i >= 0; i--) {
 		nh = &nhgi->nexthops[i];
@@ -5433,10 +5437,14 @@ mlxsw_sp_nexthop6_group_info_init(struct mlxsw_sp *mlxsw_sp,
 		mlxsw_sp_rt6 = list_next_entry(mlxsw_sp_rt6, list);
 	}
 	nh_grp->nhgi = nhgi;
-	mlxsw_sp_nexthop_group_refresh(mlxsw_sp, nh_grp);
+	err = mlxsw_sp_nexthop_group_refresh(mlxsw_sp, nh_grp);
+	if (err)
+		goto err_group_refresh;
 
 	return 0;
 
+err_group_refresh:
+	i = nhgi->count;
 err_nexthop6_init:
 	for (i--; i >= 0; i--) {
 		nh = &nhgi->nexthops[i];