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Date: Wed, 27 Jul 2022 20:03:31 +0300
From: Moshe Shemesh <moshe@...dia.com>
To: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Saeed Mahameed <saeedm@...dia.com>,
Leon Romanovsky <leon@...nel.org>,
"Tariq Toukan" <tariqt@...dia.com>,
Eric Dumazet <edumazet@...gle.com>,
Paolo Abeni <pabeni@...hat.com>
CC: Jiri Pirko <jiri@...dia.com>, <netdev@...r.kernel.org>,
Moshe Shemesh <moshe@...dia.com>
Subject: [PATCH net-next 4/9] net/mlx5: Lock mlx5 devlink reload callbacks
Change devlink instance locks in mlx5 driver to have devlink reload
callbacks locked, while keeping all driver paths which lead to devl_ API
functions called by the driver locked.
Add mlx5_load_one_devl_locked() and mlx5_unload_one_devl_locked() which
are used by the paths which are already locked such as devlink reload
callbacks.
This patch makes the driver use devl_ API also for traps register as
these functions are called from the driver paths parallel to reload that
requires locking now.
Signed-off-by: Moshe Shemesh <moshe@...dia.com>
Reviewed-by: Jiri Pirko <jiri@...dia.com>
---
drivers/net/ethernet/mellanox/mlx5/core/dev.c | 19 ++-----
.../net/ethernet/mellanox/mlx5/core/devlink.c | 50 ++++++++++++-------
.../net/ethernet/mellanox/mlx5/core/eswitch.c | 18 ++-----
.../net/ethernet/mellanox/mlx5/core/main.c | 34 ++++++++++++-
.../ethernet/mellanox/mlx5/core/mlx5_core.h | 2 +
.../net/ethernet/mellanox/mlx5/core/sriov.c | 6 +++
6 files changed, 79 insertions(+), 50 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/dev.c b/drivers/net/ethernet/mellanox/mlx5/core/dev.c
index ccf2068d2e79..0571e40c6ee5 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/dev.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/dev.c
@@ -335,13 +335,12 @@ static void del_adev(struct auxiliary_device *adev)
int mlx5_attach_device(struct mlx5_core_dev *dev)
{
- struct devlink *devlink = priv_to_devlink(dev);
struct mlx5_priv *priv = &dev->priv;
struct auxiliary_device *adev;
struct auxiliary_driver *adrv;
int ret = 0, i;
- devl_lock(devlink);
+ devl_assert_locked(priv_to_devlink(dev));
mutex_lock(&mlx5_intf_mutex);
priv->flags &= ~MLX5_PRIV_FLAGS_DETACH;
priv->flags |= MLX5_PRIV_FLAGS_MLX5E_LOCKED_FLOW;
@@ -394,20 +393,18 @@ int mlx5_attach_device(struct mlx5_core_dev *dev)
}
priv->flags &= ~MLX5_PRIV_FLAGS_MLX5E_LOCKED_FLOW;
mutex_unlock(&mlx5_intf_mutex);
- devl_unlock(devlink);
return ret;
}
void mlx5_detach_device(struct mlx5_core_dev *dev)
{
- struct devlink *devlink = priv_to_devlink(dev);
struct mlx5_priv *priv = &dev->priv;
struct auxiliary_device *adev;
struct auxiliary_driver *adrv;
pm_message_t pm = {};
int i;
- devl_lock(devlink);
+ devl_assert_locked(priv_to_devlink(dev));
mutex_lock(&mlx5_intf_mutex);
priv->flags |= MLX5_PRIV_FLAGS_MLX5E_LOCKED_FLOW;
for (i = ARRAY_SIZE(mlx5_adev_devices) - 1; i >= 0; i--) {
@@ -441,21 +438,17 @@ void mlx5_detach_device(struct mlx5_core_dev *dev)
priv->flags &= ~MLX5_PRIV_FLAGS_MLX5E_LOCKED_FLOW;
priv->flags |= MLX5_PRIV_FLAGS_DETACH;
mutex_unlock(&mlx5_intf_mutex);
- devl_unlock(devlink);
}
int mlx5_register_device(struct mlx5_core_dev *dev)
{
- struct devlink *devlink;
int ret;
- devlink = priv_to_devlink(dev);
- devl_lock(devlink);
+ devl_assert_locked(priv_to_devlink(dev));
mutex_lock(&mlx5_intf_mutex);
dev->priv.flags &= ~MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV;
ret = mlx5_rescan_drivers_locked(dev);
mutex_unlock(&mlx5_intf_mutex);
- devl_unlock(devlink);
if (ret)
mlx5_unregister_device(dev);
@@ -464,15 +457,11 @@ int mlx5_register_device(struct mlx5_core_dev *dev)
void mlx5_unregister_device(struct mlx5_core_dev *dev)
{
- struct devlink *devlink;
-
- devlink = priv_to_devlink(dev);
- devl_lock(devlink);
+ devl_assert_locked(priv_to_devlink(dev));
mutex_lock(&mlx5_intf_mutex);
dev->priv.flags = MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV;
mlx5_rescan_drivers_locked(dev);
mutex_unlock(&mlx5_intf_mutex);
- devl_unlock(devlink);
}
static int add_drivers(struct mlx5_core_dev *dev)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
index 41bb50d94caa..1c05a7091698 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/devlink.c
@@ -108,7 +108,7 @@ static int mlx5_devlink_reload_fw_activate(struct devlink *devlink, struct netli
if (err)
return err;
- mlx5_unload_one(dev);
+ mlx5_unload_one_devl_locked(dev);
err = mlx5_health_wait_pci_up(dev);
if (err)
NL_SET_ERR_MSG_MOD(extack, "FW activate aborted, PCI reads fail after reset");
@@ -143,6 +143,7 @@ static int mlx5_devlink_reload_down(struct devlink *devlink, bool netns_change,
struct mlx5_core_dev *dev = devlink_priv(devlink);
struct pci_dev *pdev = dev->pdev;
bool sf_dev_allocated;
+ int ret = 0;
sf_dev_allocated = mlx5_sf_dev_allocated(dev);
if (sf_dev_allocated) {
@@ -163,19 +164,25 @@ static int mlx5_devlink_reload_down(struct devlink *devlink, bool netns_change,
NL_SET_ERR_MSG_MOD(extack, "reload while VFs are present is unfavorable");
}
+ devl_lock(devlink);
switch (action) {
case DEVLINK_RELOAD_ACTION_DRIVER_REINIT:
- mlx5_unload_one(dev);
- return 0;
+ mlx5_unload_one_devl_locked(dev);
+ break;
case DEVLINK_RELOAD_ACTION_FW_ACTIVATE:
if (limit == DEVLINK_RELOAD_LIMIT_NO_RESET)
- return mlx5_devlink_trigger_fw_live_patch(devlink, extack);
- return mlx5_devlink_reload_fw_activate(devlink, extack);
+ ret = mlx5_devlink_trigger_fw_live_patch(devlink, extack);
+ else
+ ret = mlx5_devlink_reload_fw_activate(devlink, extack);
+ break;
default:
/* Unsupported action should not get to this function */
WARN_ON(1);
- return -EOPNOTSUPP;
+ ret = -EOPNOTSUPP;
}
+
+ devl_unlock(devlink);
+ return ret;
}
static int mlx5_devlink_reload_up(struct devlink *devlink, enum devlink_reload_action action,
@@ -183,24 +190,29 @@ static int mlx5_devlink_reload_up(struct devlink *devlink, enum devlink_reload_a
struct netlink_ext_ack *extack)
{
struct mlx5_core_dev *dev = devlink_priv(devlink);
+ int ret = 0;
+ devl_lock(devlink);
*actions_performed = BIT(action);
switch (action) {
case DEVLINK_RELOAD_ACTION_DRIVER_REINIT:
- return mlx5_load_one(dev, false);
+ ret = mlx5_load_one_devl_locked(dev, false);
+ break;
case DEVLINK_RELOAD_ACTION_FW_ACTIVATE:
if (limit == DEVLINK_RELOAD_LIMIT_NO_RESET)
break;
/* On fw_activate action, also driver is reloaded and reinit performed */
*actions_performed |= BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT);
- return mlx5_load_one(dev, false);
+ ret = mlx5_load_one_devl_locked(dev, false);
+ break;
default:
/* Unsupported action should not get to this function */
WARN_ON(1);
- return -EOPNOTSUPP;
+ ret = -EOPNOTSUPP;
}
- return 0;
+ devl_unlock(devlink);
+ return ret;
}
static struct mlx5_devlink_trap *mlx5_find_trap_by_id(struct mlx5_core_dev *dev, int trap_id)
@@ -837,28 +849,28 @@ static int mlx5_devlink_traps_register(struct devlink *devlink)
struct mlx5_core_dev *core_dev = devlink_priv(devlink);
int err;
- err = devlink_trap_groups_register(devlink, mlx5_trap_groups_arr,
- ARRAY_SIZE(mlx5_trap_groups_arr));
+ err = devl_trap_groups_register(devlink, mlx5_trap_groups_arr,
+ ARRAY_SIZE(mlx5_trap_groups_arr));
if (err)
return err;
- err = devlink_traps_register(devlink, mlx5_traps_arr, ARRAY_SIZE(mlx5_traps_arr),
- &core_dev->priv);
+ err = devl_traps_register(devlink, mlx5_traps_arr, ARRAY_SIZE(mlx5_traps_arr),
+ &core_dev->priv);
if (err)
goto err_trap_group;
return 0;
err_trap_group:
- devlink_trap_groups_unregister(devlink, mlx5_trap_groups_arr,
- ARRAY_SIZE(mlx5_trap_groups_arr));
+ devl_trap_groups_unregister(devlink, mlx5_trap_groups_arr,
+ ARRAY_SIZE(mlx5_trap_groups_arr));
return err;
}
static void mlx5_devlink_traps_unregister(struct devlink *devlink)
{
- devlink_traps_unregister(devlink, mlx5_traps_arr, ARRAY_SIZE(mlx5_traps_arr));
- devlink_trap_groups_unregister(devlink, mlx5_trap_groups_arr,
- ARRAY_SIZE(mlx5_trap_groups_arr));
+ devl_traps_unregister(devlink, mlx5_traps_arr, ARRAY_SIZE(mlx5_traps_arr));
+ devl_trap_groups_unregister(devlink, mlx5_trap_groups_arr,
+ ARRAY_SIZE(mlx5_trap_groups_arr));
}
int mlx5_devlink_register(struct devlink *devlink)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
index 30a6c9fbf1b6..6aa58044b949 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
@@ -1300,20 +1300,19 @@ int mlx5_eswitch_enable_locked(struct mlx5_eswitch *esw, int num_vfs)
*/
int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int num_vfs)
{
- struct devlink *devlink;
bool toggle_lag;
int ret;
if (!mlx5_esw_allowed(esw))
return 0;
+ devl_assert_locked(priv_to_devlink(esw->dev));
+
toggle_lag = !mlx5_esw_is_fdb_created(esw);
if (toggle_lag)
mlx5_lag_disable_change(esw->dev);
- devlink = priv_to_devlink(esw->dev);
- devl_lock(devlink);
down_write(&esw->mode_lock);
if (!mlx5_esw_is_fdb_created(esw)) {
ret = mlx5_eswitch_enable_locked(esw, num_vfs);
@@ -1327,7 +1326,6 @@ int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int num_vfs)
esw->esw_funcs.num_vfs = num_vfs;
}
up_write(&esw->mode_lock);
- devl_unlock(devlink);
if (toggle_lag)
mlx5_lag_enable_change(esw->dev);
@@ -1338,13 +1336,10 @@ int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int num_vfs)
/* When disabling sriov, free driver level resources. */
void mlx5_eswitch_disable_sriov(struct mlx5_eswitch *esw, bool clear_vf)
{
- struct devlink *devlink;
-
if (!mlx5_esw_allowed(esw))
return;
- devlink = priv_to_devlink(esw->dev);
- devl_lock(devlink);
+ devl_assert_locked(priv_to_devlink(esw->dev));
down_write(&esw->mode_lock);
/* If driver is unloaded, this function is called twice by remove_one()
* and mlx5_unload(). Prevent the second call.
@@ -1373,7 +1368,6 @@ void mlx5_eswitch_disable_sriov(struct mlx5_eswitch *esw, bool clear_vf)
unlock:
up_write(&esw->mode_lock);
- devl_unlock(devlink);
}
/* Free resources for corresponding eswitch mode. It is called by devlink
@@ -1407,18 +1401,14 @@ void mlx5_eswitch_disable_locked(struct mlx5_eswitch *esw)
void mlx5_eswitch_disable(struct mlx5_eswitch *esw)
{
- struct devlink *devlink;
-
if (!mlx5_esw_allowed(esw))
return;
+ devl_assert_locked(priv_to_devlink(esw->dev));
mlx5_lag_disable_change(esw->dev);
- devlink = priv_to_devlink(esw->dev);
- devl_lock(devlink);
down_write(&esw->mode_lock);
mlx5_eswitch_disable_locked(esw);
up_write(&esw->mode_lock);
- devl_unlock(devlink);
mlx5_lag_enable_change(esw->dev);
}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index 8b621c1ddd14..01fcb23eb69a 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -1304,8 +1304,10 @@ static void mlx5_unload(struct mlx5_core_dev *dev)
int mlx5_init_one(struct mlx5_core_dev *dev)
{
+ struct devlink *devlink = priv_to_devlink(dev);
int err = 0;
+ devl_lock(devlink);
mutex_lock(&dev->intf_state_mutex);
dev->state = MLX5_DEVICE_STATE_UP;
@@ -1334,6 +1336,7 @@ int mlx5_init_one(struct mlx5_core_dev *dev)
goto err_register;
mutex_unlock(&dev->intf_state_mutex);
+ devl_unlock(devlink);
return 0;
err_register:
@@ -1348,11 +1351,15 @@ int mlx5_init_one(struct mlx5_core_dev *dev)
err_function:
dev->state = MLX5_DEVICE_STATE_INTERNAL_ERROR;
mutex_unlock(&dev->intf_state_mutex);
+ devl_unlock(devlink);
return err;
}
void mlx5_uninit_one(struct mlx5_core_dev *dev)
{
+ struct devlink *devlink = priv_to_devlink(dev);
+
+ devl_lock(devlink);
mutex_lock(&dev->intf_state_mutex);
mlx5_unregister_device(dev);
@@ -1371,13 +1378,15 @@ void mlx5_uninit_one(struct mlx5_core_dev *dev)
mlx5_function_teardown(dev, true);
out:
mutex_unlock(&dev->intf_state_mutex);
+ devl_unlock(devlink);
}
-int mlx5_load_one(struct mlx5_core_dev *dev, bool recovery)
+int mlx5_load_one_devl_locked(struct mlx5_core_dev *dev, bool recovery)
{
int err = 0;
u64 timeout;
+ devl_assert_locked(priv_to_devlink(dev));
mutex_lock(&dev->intf_state_mutex);
if (test_bit(MLX5_INTERFACE_STATE_UP, &dev->intf_state)) {
mlx5_core_warn(dev, "interface is up, NOP\n");
@@ -1419,8 +1428,20 @@ int mlx5_load_one(struct mlx5_core_dev *dev, bool recovery)
return err;
}
-void mlx5_unload_one(struct mlx5_core_dev *dev)
+int mlx5_load_one(struct mlx5_core_dev *dev, bool recovery)
{
+ struct devlink *devlink = priv_to_devlink(dev);
+ int ret;
+
+ devl_lock(devlink);
+ ret = mlx5_load_one_devl_locked(dev, recovery);
+ devl_unlock(devlink);
+ return ret;
+}
+
+void mlx5_unload_one_devl_locked(struct mlx5_core_dev *dev)
+{
+ devl_assert_locked(priv_to_devlink(dev));
mutex_lock(&dev->intf_state_mutex);
mlx5_detach_device(dev);
@@ -1438,6 +1459,15 @@ void mlx5_unload_one(struct mlx5_core_dev *dev)
mutex_unlock(&dev->intf_state_mutex);
}
+void mlx5_unload_one(struct mlx5_core_dev *dev)
+{
+ struct devlink *devlink = priv_to_devlink(dev);
+
+ devl_lock(devlink);
+ mlx5_unload_one_devl_locked(dev);
+ devl_unlock(devlink);
+}
+
static const int types[] = {
MLX5_CAP_GENERAL,
MLX5_CAP_GENERAL_2,
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
index 9cc7afea2758..ad61b86d5769 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
@@ -290,7 +290,9 @@ void mlx5_mdev_uninit(struct mlx5_core_dev *dev);
int mlx5_init_one(struct mlx5_core_dev *dev);
void mlx5_uninit_one(struct mlx5_core_dev *dev);
void mlx5_unload_one(struct mlx5_core_dev *dev);
+void mlx5_unload_one_devl_locked(struct mlx5_core_dev *dev);
int mlx5_load_one(struct mlx5_core_dev *dev, bool recovery);
+int mlx5_load_one_devl_locked(struct mlx5_core_dev *dev, bool recovery);
int mlx5_vport_get_other_func_cap(struct mlx5_core_dev *dev, u16 function_id, void *out);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/sriov.c b/drivers/net/ethernet/mellanox/mlx5/core/sriov.c
index 5757cd6e1819..ee2e1b7c1310 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/sriov.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/sriov.c
@@ -154,13 +154,16 @@ mlx5_device_disable_sriov(struct mlx5_core_dev *dev, int num_vfs, bool clear_vf)
static int mlx5_sriov_enable(struct pci_dev *pdev, int num_vfs)
{
struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
+ struct devlink *devlink = priv_to_devlink(dev);
int err;
+ devl_lock(devlink);
err = mlx5_device_enable_sriov(dev, num_vfs);
if (err) {
mlx5_core_warn(dev, "mlx5_device_enable_sriov failed : %d\n", err);
return err;
}
+ devl_unlock(devlink);
err = pci_enable_sriov(pdev, num_vfs);
if (err) {
@@ -173,10 +176,13 @@ static int mlx5_sriov_enable(struct pci_dev *pdev, int num_vfs)
void mlx5_sriov_disable(struct pci_dev *pdev)
{
struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
+ struct devlink *devlink = priv_to_devlink(dev);
int num_vfs = pci_num_vf(dev->pdev);
pci_disable_sriov(pdev);
+ devl_lock(devlink);
mlx5_device_disable_sriov(dev, num_vfs, true);
+ devl_unlock(devlink);
}
int mlx5_core_sriov_configure(struct pci_dev *pdev, int num_vfs)
--
2.18.2
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