[PATCH net-next 03/15] net/mlx5: devcom, add DEVCOM_CANT_FAIL for non-rollback events

[Tariq Toukan <tariqt@nvidia.com>]

From: Shay Drory <shayd@nvidia.com>

Some devcom events are not expected to fail. Rather than attempting
a rollback that may not be meaningful, allow callers to pass
DEVCOM_CANT_FAIL as the rollback_event to indicate that the event
handler should not fail. If it does, emit a warning and stop
propagating to further peers, but skip the rollback path.

Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c | 7 ++++++-
 drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h | 2 ++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c
index 96b4f06d6184..64f92427602d 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.c
@@ -306,8 +306,13 @@ int mlx5_devcom_locked_send_event(struct mlx5_devcom_comp_dev *devcom,
 
 		if (pos != devcom && data) {
 			err = comp->handler(event, data, event_data);
-			if (err)
+			if (err && rollback_event != DEVCOM_CANT_FAIL) {
 				goto rollback;
+			} else if (err && rollback_event == DEVCOM_CANT_FAIL) {
+				WARN_ONCE(1, "devcom component %d event %d failed: %d\n",
+					  comp->id, event, err);
+				return err;
+			}
 		}
 	}
 
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h
index d5c60c03e55c..7a704fafdbd3 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/devcom.h
@@ -46,6 +46,8 @@ mlx5_devcom_register_component(struct mlx5_devcom_dev *devc,
 			       void *data);
 void mlx5_devcom_unregister_component(struct mlx5_devcom_comp_dev *devcom);
 
+#define DEVCOM_CANT_FAIL (INT_MAX)
+
 int mlx5_devcom_locked_send_event(struct mlx5_devcom_comp_dev *devcom,
 				  int event, int rollback_event,
 				  void *event_data);
-- 
2.44.0