mlxsw: core_linecards: Implement line card activation process

Allow to process events generated upon line card getting "ready" and
"active".

When DSDSC event with "ready" bit set is delivered, that means the
line card is powered up. Use MDDC register to push the line card to
active state. Once FW is done with that, the DSDSC event with "active"
bit set is delivered.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Jiri Pirko

drivers/net/ethernet/mellanox/mlxsw/core.h

@@ -564,7 +564,9 @@ struct mlxsw_linecard {
 	char mbct_pl[MLXSW_REG_MBCT_LEN]; /* Too big for stack */
 	enum mlxsw_linecard_status_event_type status_event_type_to;
 	struct delayed_work status_event_to_dw;
-	u8 provisioned:1;
+	u8 provisioned:1,
+	   ready:1,
+	   active:1;
 	u16 hw_revision;
 	u16 ini_version;
 };

drivers/net/ethernet/mellanox/mlxsw/core_linecards.c

@@ -90,6 +90,8 @@ static const char *mlxsw_linecard_type_name(struct mlxsw_linecard *linecard)
 static void mlxsw_linecard_provision_fail(struct mlxsw_linecard *linecard)
 {
 	linecard->provisioned = false;
+	linecard->ready = false;
+	linecard->active = false;
 	devlink_linecard_provision_fail(linecard->devlink_linecard);
 }
 
@@ -131,6 +133,46 @@ static void mlxsw_linecard_provision_clear(struct mlxsw_linecard *linecard)
 	devlink_linecard_provision_clear(linecard->devlink_linecard);
 }
 
+static int mlxsw_linecard_ready_set(struct mlxsw_linecard *linecard)
+{
+	struct mlxsw_core *mlxsw_core = linecard->linecards->mlxsw_core;
+	char mddc_pl[MLXSW_REG_MDDC_LEN];
+	int err;
+
+	mlxsw_reg_mddc_pack(mddc_pl, linecard->slot_index, false, true);
+	err = mlxsw_reg_write(mlxsw_core, MLXSW_REG(mddc), mddc_pl);
+	if (err)
+		return err;
+	linecard->ready = true;
+	return 0;
+}
+
+static int mlxsw_linecard_ready_clear(struct mlxsw_linecard *linecard)
+{
+	struct mlxsw_core *mlxsw_core = linecard->linecards->mlxsw_core;
+	char mddc_pl[MLXSW_REG_MDDC_LEN];
+	int err;
+
+	mlxsw_reg_mddc_pack(mddc_pl, linecard->slot_index, false, false);
+	err = mlxsw_reg_write(mlxsw_core, MLXSW_REG(mddc), mddc_pl);
+	if (err)
+		return err;
+	linecard->ready = false;
+	return 0;
+}
+
+static void mlxsw_linecard_active_set(struct mlxsw_linecard *linecard)
+{
+	linecard->active = true;
+	devlink_linecard_activate(linecard->devlink_linecard);
+}
+
+static void mlxsw_linecard_active_clear(struct mlxsw_linecard *linecard)
+{
+	linecard->active = false;
+	devlink_linecard_deactivate(linecard->devlink_linecard);
+}
+
 static int mlxsw_linecard_status_process(struct mlxsw_linecards *linecards,
 					 struct mlxsw_linecard *linecard,
 					 const char *mddq_pl)
@@ -164,6 +206,25 @@ static int mlxsw_linecard_status_process(struct mlxsw_linecards *linecards,
 			goto out;
 	}
 
+	if (ready == MLXSW_REG_MDDQ_SLOT_INFO_READY_READY && !linecard->ready) {
+		err = mlxsw_linecard_ready_set(linecard);
+		if (err)
+			goto out;
+	}
+
+	if (active && linecard->active != active)
+		mlxsw_linecard_active_set(linecard);
+
+	if (!active && linecard->active != active)
+		mlxsw_linecard_active_clear(linecard);
+
+	if (ready != MLXSW_REG_MDDQ_SLOT_INFO_READY_READY &&
+	    linecard->ready) {
+		err = mlxsw_linecard_ready_clear(linecard);
+		if (err)
+			goto out;
+	}
+
 	if (!provisioned && linecard->provisioned != provisioned)
 		mlxsw_linecard_provision_clear(linecard);
 
@@ -676,6 +737,8 @@ static void mlxsw_linecard_fini(struct mlxsw_core *mlxsw_core,
 	cancel_delayed_work_sync(&linecard->status_event_to_dw);
 	/* Make sure all scheduled events are processed */
 	mlxsw_core_flush_owq();
+	if (linecard->active)
+		mlxsw_linecard_active_clear(linecard);
 	devlink_linecard_destroy(linecard->devlink_linecard);
 	mutex_destroy(&linecard->lock);
 }