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net/mlx5e: Don't create devices during unload flow

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Running devlink reload command for port in switchdev mode cause
resources to corrupt: driver can't release allocated EQ and reclaim
memory pages, because "rdma" auxiliary device had add CQs which blocks
EQ from deletion.
Erroneous sequence happens during reload-down phase, and is following:

1. detach device - suspends auxiliary devices which support it, destroys
   others. During this step "eth-rep" and "rdma-rep" are destroyed,
   "eth" - suspended.
2. disable SRIOV - moves device to legacy mode; as part of disablement -
   rescans drivers. This step adds "rdma" auxiliary device.
3. destroy EQ table - <failure>.

Driver shouldn't create any device during unload flows. To handle that
implement MLX5_PRIV_FLAGS_DETACH flag, set it on device detach and unset
on device attach. If flag is set do no-op on drivers rescan.

Fixes: a925b5e309 ("net/mlx5: Register mlx5 devices to auxiliary virtual bus")
Signed-off-by: Dmytro Linkin <dlinkin@nvidia.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
This commit is contained in:
Dmytro Linkin 2021-05-14 11:14:19 +03:00 committed by Saeed Mahameed
parent 65fb7d109a
commit a5ae8fc905
2 changed files with 8 additions and 0 deletions
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4
drivers/net/ethernet/mellanox/mlx5/core/dev.c
View file

@ -303,6 +303,7 @@ int mlx5_attach_device(struct mlx5_core_dev *dev)
int ret = 0, i;
mutex_lock(&mlx5_intf_mutex);
priv->flags &= ~MLX5_PRIV_FLAGS_DETACH;
for (i = 0; i < ARRAY_SIZE(mlx5_adev_devices); i++) {
if (!priv->adev[i]) {
bool is_supported = false;
@ -375,6 +376,7 @@ void mlx5_detach_device(struct mlx5_core_dev *dev)
del_adev(&priv->adev[i]->adev);
priv->adev[i] = NULL;
}
priv->flags |= MLX5_PRIV_FLAGS_DETACH;
mutex_unlock(&mlx5_intf_mutex);
}
@ -463,6 +465,8 @@ int mlx5_rescan_drivers_locked(struct mlx5_core_dev *dev)
struct mlx5_priv *priv = &dev->priv;
lockdep_assert_held(&mlx5_intf_mutex);
if (priv->flags & MLX5_PRIV_FLAGS_DETACH)
return 0;
delete_drivers(dev);
if (priv->flags & MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV)

4
include/linux/mlx5/driver.h
View file

@ -542,6 +542,10 @@ struct mlx5_core_roce {
enum {
MLX5_PRIV_FLAGS_DISABLE_IB_ADEV = 1 << 0,
MLX5_PRIV_FLAGS_DISABLE_ALL_ADEV = 1 << 1,
/* Set during device detach to block any further devices
* creation/deletion on drivers rescan. Unset during device attach.
*/
MLX5_PRIV_FLAGS_DETACH = 1 << 2,
};
struct mlx5_adev {