mlxsw: spectrum_dcb: Convert mlxsw_sp_port_pg_prio_map() to hdroom code

The new hdroom code has certain conventions: iteration over priorities is
done through a variable named `prio', configuration is not pushed unless it
is dirty, but a `force' flag can be used to override this, updated
configuration is written to port. Convert the function
mlxsw_sp_port_pg_prio_map() to use these conventions and rename
appropriately to fit in.

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

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

@@ -64,24 +64,33 @@ static int mlxsw_sp_port_ets_validate(struct mlxsw_sp_port *mlxsw_sp_port,
 	return 0;
 }
 
-static int mlxsw_sp_port_pg_prio_map(struct mlxsw_sp_port *mlxsw_sp_port,
-				     u8 *prio_tc)
+static int mlxsw_sp_hdroom_configure_priomap(struct mlxsw_sp_port *mlxsw_sp_port,
+					     const struct mlxsw_sp_hdroom *hdroom, bool force)
 {
 	char pptb_pl[MLXSW_REG_PPTB_LEN];
-	int i;
+	bool dirty;
+	int prio;
+	int err;
+
+	dirty = memcmp(&mlxsw_sp_port->hdroom->prios, &hdroom->prios, sizeof(hdroom->prios));
+	if (!dirty && !force)
+		return 0;
 
 	mlxsw_reg_pptb_pack(pptb_pl, mlxsw_sp_port->local_port);
-	for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++)
-		mlxsw_reg_pptb_prio_to_buff_pack(pptb_pl, i, prio_tc[i]);
+	for (prio = 0; prio < IEEE_8021QAZ_MAX_TCS; prio++)
+		mlxsw_reg_pptb_prio_to_buff_pack(pptb_pl, prio, hdroom->prios.prio[prio].buf_idx);
+
+	err = mlxsw_reg_write(mlxsw_sp_port->mlxsw_sp->core, MLXSW_REG(pptb), pptb_pl);
+	if (err)
+		return err;
 
-	return mlxsw_reg_write(mlxsw_sp_port->mlxsw_sp->core, MLXSW_REG(pptb),
-			       pptb_pl);
+	mlxsw_sp_port->hdroom->prios = hdroom->prios;
+	return 0;
 }
 
 static int mlxsw_sp_port_headroom_ets_set(struct mlxsw_sp_port *mlxsw_sp_port,
 					  struct ieee_ets *ets)
 {
-	struct ieee_ets *my_ets = mlxsw_sp_port->dcb.ets;
 	struct net_device *dev = mlxsw_sp_port->dev;
 	struct mlxsw_sp_hdroom orig_hdroom;
 	struct mlxsw_sp_hdroom tmp_hdroom;
@@ -115,7 +124,7 @@ static int mlxsw_sp_port_headroom_ets_set(struct mlxsw_sp_port *mlxsw_sp_port,
 		return err;
 	}
 
-	err = mlxsw_sp_port_pg_prio_map(mlxsw_sp_port, ets->prio_tc);
+	err = mlxsw_sp_hdroom_configure_priomap(mlxsw_sp_port, &hdroom, false);
 	if (err) {
 		netdev_err(dev, "Failed to set PG-priority mapping\n");
 		goto err_port_prio_pg_map;
@@ -130,7 +139,7 @@ static int mlxsw_sp_port_headroom_ets_set(struct mlxsw_sp_port *mlxsw_sp_port,
 	return 0;
 
 err_configure_buffers:
-	mlxsw_sp_port_pg_prio_map(mlxsw_sp_port, my_ets->prio_tc);
+	mlxsw_sp_hdroom_configure_priomap(mlxsw_sp_port, &tmp_hdroom, false);
 err_port_prio_pg_map:
 	mlxsw_sp_hdroom_configure(mlxsw_sp_port, &orig_hdroom);
 	return err;