6.12-stable review patch. If anyone has any objections, please let me know.
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From: Jianbo Liu jianbol@nvidia.com
[ Upstream commit 2a4f56fbcc473d8faeb29b73082df39efbe5893c ]
In the cited commit, when changing from switchdev to legacy mode, uplink representor's netdev is kept, and its profile is replaced with nic profile, so netdev is detached from old profile, then attach to new profile.
During profile change, the hardware resources allocated by the old profile will be cleaned up. However, the cleanup is relying on the related kernel modules. And they may need to flush themselves first, which is triggered by netdev events, for example, NETDEV_UNREGISTER. However, netdev is kept, or netdev_register is called after the cleanup, which may cause troubles because the resources are still referred by kernel modules.
The same process applies to all the caes when uplink is leaving switchdev mode, including devlink eswitch mode set legacy, driver unload and devlink reload. For the first one, it can be blocked and returns failure to users, whenever possible. But it's hard for the others. Besides, the attachment to nic profile is unnecessary as the netdev will be unregistered anyway for such cases.
So in this patch, the original behavior is kept only for devlink eswitch set mode legacy. For the others, moves netdev unregistration before the profile change.
Fixes: 7a9fb35e8c3a ("net/mlx5e: Do not reload ethernet ports when changing eswitch mode") Signed-off-by: Jianbo Liu jianbol@nvidia.com Signed-off-by: Tariq Toukan tariqt@nvidia.com Link: https://patch.msgid.link/20241220081505.1286093-5-tariqt@nvidia.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- .../net/ethernet/mellanox/mlx5/core/en_main.c | 19 +++++++++++++++++-- .../net/ethernet/mellanox/mlx5/core/en_rep.c | 15 +++++++++++++++ .../mellanox/mlx5/core/eswitch_offloads.c | 2 ++ include/linux/mlx5/driver.h | 1 + 4 files changed, 35 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c index c14bef83d84d..62b8a7c1c6b5 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c @@ -6510,8 +6510,23 @@ static void _mlx5e_remove(struct auxiliary_device *adev)
mlx5_core_uplink_netdev_set(mdev, NULL); mlx5e_dcbnl_delete_app(priv); - unregister_netdev(priv->netdev); - _mlx5e_suspend(adev, false); + /* When unload driver, the netdev is in registered state + * if it's from legacy mode. If from switchdev mode, it + * is already unregistered before changing to NIC profile. + */ + if (priv->netdev->reg_state == NETREG_REGISTERED) { + unregister_netdev(priv->netdev); + _mlx5e_suspend(adev, false); + } else { + struct mlx5_core_dev *pos; + int i; + + if (test_bit(MLX5E_STATE_DESTROYING, &priv->state)) + mlx5_sd_for_each_dev(i, mdev, pos) + mlx5e_destroy_mdev_resources(pos); + else + _mlx5e_suspend(adev, true); + } /* Avoid cleanup if profile rollback failed. */ if (priv->profile) priv->profile->cleanup(priv); diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c index 92094bf60d59..0657d1076535 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c @@ -1508,6 +1508,21 @@ mlx5e_vport_uplink_rep_unload(struct mlx5e_rep_priv *rpriv)
priv = netdev_priv(netdev);
+ /* This bit is set when using devlink to change eswitch mode from + * switchdev to legacy. As need to keep uplink netdev ifindex, we + * detach uplink representor profile and attach NIC profile only. + * The netdev will be unregistered later when unload NIC auxiliary + * driver for this case. + * We explicitly block devlink eswitch mode change if any IPSec rules + * offloaded, but can't block other cases, such as driver unload + * and devlink reload. We have to unregister netdev before profile + * change for those cases. This is to avoid resource leak because + * the offloaded rules don't have the chance to be unoffloaded before + * cleanup which is triggered by detach uplink representor profile. + */ + if (!(priv->mdev->priv.flags & MLX5_PRIV_FLAGS_SWITCH_LEGACY)) + unregister_netdev(netdev); + mlx5e_netdev_attach_nic_profile(priv); }
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c index 3cf695425f0a..3950b1d4b3d8 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c @@ -3759,6 +3759,8 @@ int mlx5_devlink_eswitch_mode_set(struct devlink *devlink, u16 mode, esw->eswitch_operation_in_progress = true; up_write(&esw->mode_lock);
+ if (mode == DEVLINK_ESWITCH_MODE_LEGACY) + esw->dev->priv.flags |= MLX5_PRIV_FLAGS_SWITCH_LEGACY; mlx5_eswitch_disable_locked(esw); if (mode == DEVLINK_ESWITCH_MODE_SWITCHDEV) { if (mlx5_devlink_trap_get_num_active(esw->dev)) { diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h index a9fca765b3d1..82c7056e2759 100644 --- a/include/linux/mlx5/driver.h +++ b/include/linux/mlx5/driver.h @@ -555,6 +555,7 @@ enum { * creation/deletion on drivers rescan. Unset during device attach. */ MLX5_PRIV_FLAGS_DETACH = 1 << 2, + MLX5_PRIV_FLAGS_SWITCH_LEGACY = 1 << 3, };
struct mlx5_adev {