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net/mlx5: E-switch, Devcom, sync devcom events and devcom comp register

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[ Upstream commit 8c253dfc89 ]

devcom events are sent to all registered component. Following the
cited patch, it is possible for two components, e.g.: two eswitches,
to send devcom events, while both components are registered. This
means eswitch layer will do double un/pairing, which is double
allocation and free of resources, even though only one un/pairing is
needed. flow example:

	cpu0					cpu1
	----					----

 mlx5_devlink_eswitch_mode_set(dev0)
  esw_offloads_devcom_init()
   mlx5_devcom_register_component(esw0)
                                         mlx5_devlink_eswitch_mode_set(dev1)
                                          esw_offloads_devcom_init()
                                           mlx5_devcom_register_component(esw1)
                                           mlx5_devcom_send_event()
   mlx5_devcom_send_event()

Hence, check whether the eswitches are already un/paired before
free/allocation of resources.

Fixes: 09b278462f ("net: devlink: enable parallel ops on netlink interface")
Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Shay Drory
2023-02-06 11:52:02 +02:00
committed by Greg Kroah-Hartman
parent 3347ac7a81
commit 085f27f48c
2 changed files with 9 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
View File

@@ -340,6 +340,7 @@ struct mlx5_eswitch {
} params;
struct blocking_notifier_head n_head;
struct dentry *dbgfs;
bool paired[MLX5_MAX_PORTS];
};
void esw_offloads_disable(struct mlx5_eswitch *esw);

9
drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
View File

@@ -2827,6 +2827,9 @@ static int mlx5_esw_offloads_devcom_event(int event,
mlx5_eswitch_vport_match_metadata_enabled(peer_esw))
break;
if (esw->paired[mlx5_get_dev_index(peer_esw->dev)])
break;
err = mlx5_esw_offloads_set_ns_peer(esw, peer_esw, true);
if (err)
goto err_out;
@@ -2838,14 +2841,18 @@ static int mlx5_esw_offloads_devcom_event(int event,
if (err)
goto err_pair;
esw->paired[mlx5_get_dev_index(peer_esw->dev)] = true;
peer_esw->paired[mlx5_get_dev_index(esw->dev)] = true;
mlx5_devcom_set_paired(devcom, MLX5_DEVCOM_ESW_OFFLOADS, true);
break;
case ESW_OFFLOADS_DEVCOM_UNPAIR:
if (!mlx5_devcom_is_paired(devcom, MLX5_DEVCOM_ESW_OFFLOADS))
if (!esw->paired[mlx5_get_dev_index(peer_esw->dev)])
break;
mlx5_devcom_set_paired(devcom, MLX5_DEVCOM_ESW_OFFLOADS, false);
esw->paired[mlx5_get_dev_index(peer_esw->dev)] = false;
peer_esw->paired[mlx5_get_dev_index(esw->dev)] = false;
mlx5_esw_offloads_unpair(peer_esw);
mlx5_esw_offloads_unpair(esw);
mlx5_esw_offloads_set_ns_peer(esw, peer_esw, false);