net/mlx5: EQ, Introduce atomic notifier chain subscription API

Use atomic_notifier_chain to fire firmware events at internal mlx5 core
components such as eswitch/fpga/clock/FW tracer/etc.., this is to
avoid explicit calls from low level mlx5_core to upper components and to
simplify the mlx5_core API for future developments.

Simply provide register/unregister notifiers API and call the notifier
chain on firmware async events.

Example: to subscribe to a FW event:
struct mlx5_nb port_event;

MLX5_NB_INIT(&port_event, port_event_handler, PORT_CHANGE);
mlx5_eq_notifier_register(mdev, &port_event);

where:
 - port_event_handler is the notifier block callback.
 - PORT_EVENT is the suffix of MLX5_EVENT_TYPE_PORT_CHANGE.

The above will guarantee that port_event_handler will receive all FW
events of the type MLX5_EVENT_TYPE_PORT_CHANGE.

To receive all FW/HW events one can subscribe to
MLX5_EVENT_TYPE_NOTIFY_ANY.

The next few patches will start moving all mlx5 core components to use
this new API and cleanup mlx5_eq_async_int misx handler from component
explicit calls and specific logic.

Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

1 files changed, 14 insertions, 2 deletions

diff --git a/include/linux/mlx5/eq.h b/include/linux/mlx5/eq.h
index 71d82c5a1a02..00045cc4ea11 100644
--- a/include/linux/mlx5/eq.h
+++ b/include/linux/mlx5/eq.h
@@ -4,8 +4,6 @@
 #ifndef MLX5_CORE_EQ_H
 #define MLX5_CORE_EQ_H
 
-#include <linux/mlx5/driver.h>
-
 enum {
 	MLX5_EQ_PAGEREQ_IDX        = 0,
 	MLX5_EQ_CMD_IDX            = 1,
@@ -22,6 +20,7 @@ enum {
 #define MLX5_NUM_SPARE_EQE (0x80)
 
 struct mlx5_eq;
+struct mlx5_core_dev;
 
 struct mlx5_eq_param {
 	u8             index;
@@ -57,4 +56,17 @@ static inline u32 mlx5_eq_update_cc(struct mlx5_eq *eq, u32 cc)
 	return cc;
 }
 
+struct mlx5_nb {
+	struct notifier_block nb;
+	u8 event_type;
+};
+
+#define mlx5_nb_cof(ptr, type, member) \
+	(container_of(container_of(ptr, struct mlx5_nb, nb), type, member))
+
+#define MLX5_NB_INIT(name, handler, event) do {              \
+	(name)->nb.notifier_call = handler;                  \
+	(name)->event_type = MLX5_EVENT_TYPE_##event;        \
+} while (0)
+
 #endif /* MLX5_CORE_EQ_H */