net/mlx5: Handle pairing of E-switch via uplink un/load APIs

commit 2be5bd42a5bba1a05daedc86cf0e248210009669 upstream.

In case user switch a device from switchdev mode to legacy mode, mlx5
first unpair the E-switch and afterwards unload the uplink vport.
From the other hand, in case user remove or reload a device, mlx5
first unload the uplink vport and afterwards unpair the E-switch.

The latter is causing a bug[1], hence, handle pairing of E-switch as
part of uplink un/load APIs.

[1]
In case VF_LAG is used, every tc fdb flow is duplicated to the peer
esw. However, the original esw keeps a pointer to this duplicated
flow, not the peer esw.
e.g.: if user create tc fdb flow over esw0, the flow is duplicated
over esw1, in FW/HW, but in SW, esw0 keeps a pointer to the duplicated
flow.
During module unload while a peer tc fdb flow is still offloaded, in
case the first device to be removed is the peer device (esw1 in the
example above), the peer net-dev is destroyed, and so the mlx5e_priv
is memset to 0.
Afterwards, the peer device is trying to unpair himself from the
original device (esw0 in the example above). Unpair API invoke the
original device to clear peer flow from its eswitch (esw0), but the
peer flow, which is stored over the original eswitch (esw0), is
trying to use the peer mlx5e_priv, which is memset to 0 and result in
bellow kernel-oops.

[  157.964081 ] BUG: unable to handle page fault for address: 000000000002ce60
[  157.964662 ] #PF: supervisor read access in kernel mode
[  157.965123 ] #PF: error_code(0x0000) - not-present page
[  157.965582 ] PGD 0 P4D 0
[  157.965866 ] Oops: 0000 [#1] SMP
[  157.967670 ] RIP: 0010:mlx5e_tc_del_fdb_flow+0x48/0x460 [mlx5_core]
[  157.976164 ] Call Trace:
[  157.976437 ]  <TASK>
[  157.976690 ]  __mlx5e_tc_del_fdb_peer_flow+0xe6/0x100 [mlx5_core]
[  157.977230 ]  mlx5e_tc_clean_fdb_peer_flows+0x67/0x90 [mlx5_core]
[  157.977767 ]  mlx5_esw_offloads_unpair+0x2d/0x1e0 [mlx5_core]
[  157.984653 ]  mlx5_esw_offloads_devcom_event+0xbf/0x130 [mlx5_core]
[  157.985212 ]  mlx5_devcom_send_event+0xa3/0xb0 [mlx5_core]
[  157.985714 ]  esw_offloads_disable+0x5a/0x110 [mlx5_core]
[  157.986209 ]  mlx5_eswitch_disable_locked+0x152/0x170 [mlx5_core]
[  157.986757 ]  mlx5_eswitch_disable+0x51/0x80 [mlx5_core]
[  157.987248 ]  mlx5_unload+0x2a/0xb0 [mlx5_core]
[  157.987678 ]  mlx5_uninit_one+0x5f/0xd0 [mlx5_core]
[  157.988127 ]  remove_one+0x64/0xe0 [mlx5_core]
[  157.988549 ]  pci_device_remove+0x31/0xa0
[  157.988933 ]  device_release_driver_internal+0x18f/0x1f0
[  157.989402 ]  driver_detach+0x3f/0x80
[  157.989754 ]  bus_remove_driver+0x70/0xf0
[  157.990129 ]  pci_unregister_driver+0x34/0x90
[  157.990537 ]  mlx5_cleanup+0xc/0x1c [mlx5_core]
[  157.990972 ]  __x64_sys_delete_module+0x15a/0x250
[  157.991398 ]  ? exit_to_user_mode_prepare+0xea/0x110
[  157.991840 ]  do_syscall_64+0x3d/0x90
[  157.992198 ]  entry_SYSCALL_64_after_hwframe+0x46/0xb0

Fixes: 04de7dda7394 ("net/mlx5e: Infrastructure for duplicated offloading of TC flows")
Fixes: 1418ddd96afd ("net/mlx5e: Duplicate offloaded TC eswitch rules under uplink LAG")
Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 023fb00513631c2c77350b753c1478e2be5f4fa5..2b1094e5b0c9d8b738577b3af20955b0a8a52e2d 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -5449,6 +5449,8 @@ int mlx5e_tc_esw_init(struct mlx5_rep_uplink_priv *uplink_priv)
                goto err_action_counter;
        }
 
+       mlx5_esw_offloads_devcom_init(esw);
+
        return 0;
 
 err_action_counter:
@@ -5477,7 +5479,7 @@ void mlx5e_tc_esw_cleanup(struct mlx5_rep_uplink_priv *uplink_priv)
        priv = netdev_priv(rpriv->netdev);
        esw = priv->mdev->priv.eswitch;
 
-       mlx5e_tc_clean_fdb_peer_flows(esw);
+       mlx5_esw_offloads_devcom_cleanup(esw);
 
        mlx5e_tc_tun_cleanup(uplink_priv->encap);
 

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
index 9d5a5756a15a969d25212c0dcb3967e4882846cb..c8c12d1672f998e68479cd7599480f33925ee844 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
@@ -371,6 +371,8 @@ int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int num_vfs);
 void mlx5_eswitch_disable_sriov(struct mlx5_eswitch *esw, bool clear_vf);
 void mlx5_eswitch_disable_locked(struct mlx5_eswitch *esw);
 void mlx5_eswitch_disable(struct mlx5_eswitch *esw);
+void mlx5_esw_offloads_devcom_init(struct mlx5_eswitch *esw);
+void mlx5_esw_offloads_devcom_cleanup(struct mlx5_eswitch *esw);
 int mlx5_eswitch_set_vport_mac(struct mlx5_eswitch *esw,
                               u16 vport, const u8 *mac);
 int mlx5_eswitch_set_vport_state(struct mlx5_eswitch *esw,
@@ -768,6 +770,8 @@ static inline void mlx5_eswitch_cleanup(struct mlx5_eswitch *esw) {}
 static inline int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int num_vfs) { return 0; }
 static inline void mlx5_eswitch_disable_sriov(struct mlx5_eswitch *esw, bool clear_vf) {}
 static inline void mlx5_eswitch_disable(struct mlx5_eswitch *esw) {}
+static inline void mlx5_esw_offloads_devcom_init(struct mlx5_eswitch *esw) {}
+static inline void mlx5_esw_offloads_devcom_cleanup(struct mlx5_eswitch *esw) {}
 static inline bool mlx5_eswitch_is_funcs_handler(struct mlx5_core_dev *dev) { return false; }
 static inline
 int mlx5_eswitch_set_vport_state(struct mlx5_eswitch *esw, u16 vport, int link_state) { return 0; }

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
index c99d208722f58db3497e6779b9fc45649df866b2..590df9bf39a56f77c725dd18b5e0cc630792c2b7 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
@@ -2781,7 +2781,7 @@ static int mlx5_esw_offloads_devcom_event(int event,
        return err;
 }
 
-static void esw_offloads_devcom_init(struct mlx5_eswitch *esw)
+void mlx5_esw_offloads_devcom_init(struct mlx5_eswitch *esw)
 {
        struct mlx5_devcom *devcom = esw->dev->priv.devcom;
 
@@ -2804,7 +2804,7 @@ static void esw_offloads_devcom_init(struct mlx5_eswitch *esw)
                               ESW_OFFLOADS_DEVCOM_PAIR, esw);
 }
 
-static void esw_offloads_devcom_cleanup(struct mlx5_eswitch *esw)
+void mlx5_esw_offloads_devcom_cleanup(struct mlx5_eswitch *esw)
 {
        struct mlx5_devcom *devcom = esw->dev->priv.devcom;
 
@@ -3274,8 +3274,6 @@ int esw_offloads_enable(struct mlx5_eswitch *esw)
        if (err)
                goto err_vports;
 
-       esw_offloads_devcom_init(esw);
-
        return 0;
 
 err_vports:
@@ -3316,7 +3314,6 @@ static int esw_offloads_stop(struct mlx5_eswitch *esw,
 
 void esw_offloads_disable(struct mlx5_eswitch *esw)
 {
-       esw_offloads_devcom_cleanup(esw);
        mlx5_eswitch_disable_pf_vf_vports(esw);
        esw_offloads_unload_rep(esw, MLX5_VPORT_UPLINK);
        esw_set_passing_vport_metadata(esw, false);