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Message-ID: <74edb8d45d004e8d8f5318eede6ccc3d786d8ba9.1705502064.git.petrm@nvidia.com>
Date: Wed, 17 Jan 2024 16:04:19 +0100
From: Petr Machata <petrm@...dia.com>
To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
<pabeni@...hat.com>, <netdev@...r.kernel.org>
CC: Ido Schimmel <idosch@...dia.com>, Petr Machata <petrm@...dia.com>,
Danielle Ratson <danieller@...dia.com>, Amit Cohen <amcohen@...dia.com>,
"Jiri Pirko" <jiri@...nulli.us>, <mlxsw@...dia.com>, Maksym Yaremchuk
<maksymy@...dia.com>
Subject: [PATCH net 4/6] mlxsw: spectrum_router: Register netdevice notifier before nexthop
If there are IPIP nexthops at the time when the driver is loaded (or the
devlink instance reloaded), the driver looks up the corresponding IPIP
entry. But IPIP entries are only created as a result of netdevice
notifications. Since the netdevice notifier is registered after the nexthop
notifier, mlxsw_sp_nexthop_type_init() never finds the IPIP entry,
registers the nexthop MLXSW_SP_NEXTHOP_TYPE_ETH, and fails to assign a CRIF
to the nexthop. Later on when the CRIF is necessary, the WARN_ON in
mlxsw_sp_nexthop_rif() triggers, causing the splat [1].
In order to fix the issue, reorder the netdevice notifier to be registered
before the nexthop one.
[1] (edited for clarity):
WARNING: CPU: 1 PID: 1364 at drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:3245 mlxsw_sp_nexthop_rif (drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:3246 (discriminator 1)) mlxsw_spectrum
Hardware name: Mellanox Technologies Ltd. MSN4410/VMOD0010, BIOS 5.11 01/06/2019
Call Trace:
? mlxsw_sp_nexthop_rif (drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:3246 (discriminator 1)) mlxsw_spectrum
__mlxsw_sp_nexthop_eth_update (drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:3637) mlxsw_spectrum
mlxsw_sp_nexthop_update (drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:3679 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:3727) mlxsw_spectrum
mlxsw_sp_nexthop_group_update (drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:3757) mlxsw_spectrum
mlxsw_sp_nexthop_group_refresh (drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:4112) mlxsw_spectrum
mlxsw_sp_nexthop_obj_event (drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:5118 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:5191 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:5315 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:5500) mlxsw_spectrum
nexthops_dump (net/ipv4/nexthop.c:217 net/ipv4/nexthop.c:440 net/ipv4/nexthop.c:3609)
register_nexthop_notifier (net/ipv4/nexthop.c:3624)
mlxsw_sp_router_init (drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:11486) mlxsw_spectrum
mlxsw_sp_init (drivers/net/ethernet/mellanox/mlxsw/spectrum.c:3267) mlxsw_spectrum
__mlxsw_core_bus_device_register (drivers/net/ethernet/mellanox/mlxsw/core.c:2202) mlxsw_core
mlxsw_devlink_core_bus_device_reload_up (drivers/net/ethernet/mellanox/mlxsw/core.c:2265 drivers/net/ethernet/mellanox/mlxsw/core.c:1603) mlxsw_core
devlink_reload (net/devlink/dev.c:314 net/devlink/dev.c:475)
[...]
Fixes: 9464a3d68ea9 ("mlxsw: spectrum_router: Track next hops at CRIFs")
Reported-by: Maksym Yaremchuk <maksymy@...dia.com>
Signed-off-by: Petr Machata <petrm@...dia.com>
Reviewed-by: Ido Schimmel <idosch@...dia.com>
---
.../ethernet/mellanox/mlxsw/spectrum_router.c | 24 +++++++++----------
1 file changed, 12 insertions(+), 12 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index 2c255ed9b8a9..7164f9e6370f 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -11472,6 +11472,13 @@ int mlxsw_sp_router_init(struct mlxsw_sp *mlxsw_sp,
if (err)
goto err_register_netevent_notifier;
+ mlxsw_sp->router->netdevice_nb.notifier_call =
+ mlxsw_sp_router_netdevice_event;
+ err = register_netdevice_notifier_net(mlxsw_sp_net(mlxsw_sp),
+ &mlxsw_sp->router->netdevice_nb);
+ if (err)
+ goto err_register_netdev_notifier;
+
mlxsw_sp->router->nexthop_nb.notifier_call =
mlxsw_sp_nexthop_obj_event;
err = register_nexthop_notifier(mlxsw_sp_net(mlxsw_sp),
@@ -11487,22 +11494,15 @@ int mlxsw_sp_router_init(struct mlxsw_sp *mlxsw_sp,
if (err)
goto err_register_fib_notifier;
- mlxsw_sp->router->netdevice_nb.notifier_call =
- mlxsw_sp_router_netdevice_event;
- err = register_netdevice_notifier_net(mlxsw_sp_net(mlxsw_sp),
- &mlxsw_sp->router->netdevice_nb);
- if (err)
- goto err_register_netdev_notifier;
-
return 0;
-err_register_netdev_notifier:
- unregister_fib_notifier(mlxsw_sp_net(mlxsw_sp),
- &mlxsw_sp->router->fib_nb);
err_register_fib_notifier:
unregister_nexthop_notifier(mlxsw_sp_net(mlxsw_sp),
&mlxsw_sp->router->nexthop_nb);
err_register_nexthop_notifier:
+ unregister_netdevice_notifier_net(mlxsw_sp_net(mlxsw_sp),
+ &router->netdevice_nb);
+err_register_netdev_notifier:
unregister_netevent_notifier(&mlxsw_sp->router->netevent_nb);
err_register_netevent_notifier:
unregister_inet6addr_validator_notifier(&router->inet6addr_valid_nb);
@@ -11550,11 +11550,11 @@ void mlxsw_sp_router_fini(struct mlxsw_sp *mlxsw_sp)
{
struct mlxsw_sp_router *router = mlxsw_sp->router;
- unregister_netdevice_notifier_net(mlxsw_sp_net(mlxsw_sp),
- &router->netdevice_nb);
unregister_fib_notifier(mlxsw_sp_net(mlxsw_sp), &router->fib_nb);
unregister_nexthop_notifier(mlxsw_sp_net(mlxsw_sp),
&router->nexthop_nb);
+ unregister_netdevice_notifier_net(mlxsw_sp_net(mlxsw_sp),
+ &router->netdevice_nb);
unregister_netevent_notifier(&router->netevent_nb);
unregister_inet6addr_validator_notifier(&router->inet6addr_valid_nb);
unregister_inetaddr_validator_notifier(&router->inetaddr_valid_nb);
--
2.42.0
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