net/mlx5: Add host params change event

In Embedded CPU (EC) configurations, the EC driver needs to know when
the number of virtual functions change on the corresponding PF at the
host side. This is required so the EC driver can create or destroy
representor net devices that represent the VFs ports.

Whenever a change in the number of VFs occurs, firmware will generate an
event towards the EC which will trigger a work to complete the rest of
the handling. The specifics of the handling will be introduced in a
downstream patch.

Signed-off-by: Bodong Wang <bodong@mellanox.com>
Signed-off-by: Eli Cohen <eli@mellanox.com>
Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/eq.c

@@ -530,6 +530,9 @@ static u64 gather_async_events_mask(struct mlx5_core_dev *dev)
 	if (MLX5_CAP_GEN(dev, max_num_of_monitor_counters))
 		async_event_mask |= (1ull << MLX5_EVENT_TYPE_MONITOR_COUNTER);
 
+	if (mlx5_core_is_ecpf_esw_manager(dev))
+		async_event_mask |= (1ull << MLX5_EVENT_TYPE_HOST_PARAMS_CHANGE);
+
 	return async_event_mask;
 }
 

drivers/net/ethernet/mellanox/mlx5/core/events.c

@@ -103,6 +103,8 @@ static const char *eqe_type_str(u8 type)
 		return "MLX5_EVENT_TYPE_STALL_EVENT";
 	case MLX5_EVENT_TYPE_CMD:
 		return "MLX5_EVENT_TYPE_CMD";
+	case MLX5_EVENT_TYPE_HOST_PARAMS_CHANGE:
+		return "MLX5_EVENT_TYPE_HOST_PARAMS_CHANGE";
 	case MLX5_EVENT_TYPE_PAGE_REQUEST:
 		return "MLX5_EVENT_TYPE_PAGE_REQUEST";
 	case MLX5_EVENT_TYPE_PAGE_FAULT:

include/linux/mlx5/device.h

@@ -342,6 +342,8 @@ enum mlx5_event {
 	MLX5_EVENT_TYPE_PAGE_FAULT	   = 0xc,
 	MLX5_EVENT_TYPE_NIC_VPORT_CHANGE   = 0xd,
 
+	MLX5_EVENT_TYPE_HOST_PARAMS_CHANGE = 0xe,
+
 	MLX5_EVENT_TYPE_DCT_DRAINED        = 0x1c,
 
 	MLX5_EVENT_TYPE_FPGA_ERROR         = 0x20,

include/linux/mlx5/driver.h

@@ -1083,6 +1083,11 @@ static inline bool mlx5_core_is_ecpf(struct mlx5_core_dev *dev)
 	return dev->caps.embedded_cpu;
 }
 
+static inline bool mlx5_core_is_ecpf_esw_manager(struct mlx5_core_dev *dev)
+{
+	return dev->caps.embedded_cpu && MLX5_CAP_GEN(dev, eswitch_manager);
+}
+
 #define MLX5_TOTAL_VPORTS(mdev) (1 + pci_sriov_get_totalvfs((mdev)->pdev))
 #define MLX5_VPORT_MANAGER(mdev) \
 	(MLX5_CAP_GEN(mdev, vport_group_manager) && \