mlxsw: reg: Adjust PPCNT register to support local port 255

Local port 255 has a special meaning in PPCNT register, it is used to
refer to all local ports. This wild card ability is not currently used
by the driver.

Special casing local port 255 in Spectrum-4 systems where it is a valid
port is going to be a problem.

Work around this issue by adding and always setting the 'lp_gl' bit
which instructs the device's firmware to treat this local port like an
ordinary port.
Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -4910,8 +4910,6 @@ MLXSW_ITEM32(reg, ppcnt, swid, 0x00, 24, 8);
 
 /* reg_ppcnt_local_port
  * Local port number.
- * 255 indicates all ports on the device, and is only allowed
- * for Set() operation.
  * Access: Index
  */
 MLXSW_ITEM32_LP(reg, ppcnt, 0x00, 16, 0x00, 12);
@@ -4963,6 +4961,14 @@ MLXSW_ITEM32(reg, ppcnt, grp, 0x00, 0, 6);
  */
 MLXSW_ITEM32(reg, ppcnt, clr, 0x04, 31, 1);
 
+/* reg_ppcnt_lp_gl
+ * Local port global variable.
+ * 0: local_port 255 = all ports of the device.
+ * 1: local_port indicates local port number for all ports.
+ * Access: OP
+ */
+MLXSW_ITEM32(reg, ppcnt, lp_gl, 0x04, 30, 1);
+
 /* reg_ppcnt_prio_tc
  * Priority for counter set that support per priority, valid values: 0-7.
  * Traffic class for counter set that support per traffic class,
@@ -5396,6 +5402,7 @@ static inline void mlxsw_reg_ppcnt_pack(char *payload, u8 local_port,
 	mlxsw_reg_ppcnt_pnat_set(payload, 0);
 	mlxsw_reg_ppcnt_grp_set(payload, grp);
 	mlxsw_reg_ppcnt_clr_set(payload, 0);
+	mlxsw_reg_ppcnt_lp_gl_set(payload, 1);
 	mlxsw_reg_ppcnt_prio_tc_set(payload, prio_tc);
 }