mlxsw: spectrum_buffers: Change initialization of PG 9

As explained in commit ff6551ec0c27 ("mlxsw: spectrum: Correctly
configure headroom size") control packets are directed to priority group
buffer 9 (PG9) in the ports' headroom buffers.

Since we don't want to drop control packets in case they can't be
admitted to the switch's shared buffer we bind PG9 to a different
ingress pool from the one used by all other PGs.

Unlike other PGs, we currently don't expose the binding between PG9 to a
pool and leave it fixed.

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

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

@@ -181,6 +181,7 @@ static int mlxsw_sp_port_headroom_init(struct mlxsw_sp_port *mlxsw_sp_port)
 
 #define MLXSW_SP_SB_PR_INGRESS_SIZE				\
 	(15000000 - (2 * 20000 * MLXSW_PORT_MAX_PORTS))
+#define MLXSW_SP_SB_PR_INGRESS_MNG_SIZE (200 * 1000)
 #define MLXSW_SP_SB_PR_EGRESS_SIZE				\
 	(14000000 - (8 * 1500 * MLXSW_PORT_MAX_PORTS))
 
@@ -195,7 +196,8 @@ static const struct mlxsw_sp_sb_pr mlxsw_sp_sb_prs_ingress[] = {
 		       MLXSW_SP_BYTES_TO_CELLS(MLXSW_SP_SB_PR_INGRESS_SIZE)),
 	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, 0),
 	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, 0),
-	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, 0),
+	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC,
+		       MLXSW_SP_BYTES_TO_CELLS(MLXSW_SP_SB_PR_INGRESS_MNG_SIZE)),
 };
 
 #define MLXSW_SP_SB_PRS_INGRESS_LEN ARRAY_SIZE(mlxsw_sp_sb_prs_ingress)
@@ -261,7 +263,7 @@ static const struct mlxsw_sp_sb_cm mlxsw_sp_sb_cms_ingress[] = {
 	MLXSW_SP_SB_CM(0, 0, 0),
 	MLXSW_SP_SB_CM(0, 0, 0),
 	MLXSW_SP_SB_CM(0, 0, 0), /* dummy, this PG does not exist */
-	MLXSW_SP_SB_CM(MLXSW_SP_BYTES_TO_CELLS(20000), 0xff, 0),
+	MLXSW_SP_SB_CM(MLXSW_SP_BYTES_TO_CELLS(20000), 1, 3),
 };
 
 #define MLXSW_SP_SB_CMS_INGRESS_LEN ARRAY_SIZE(mlxsw_sp_sb_cms_ingress)
@@ -386,7 +388,7 @@ static const struct mlxsw_sp_sb_pm mlxsw_sp_sb_pms_ingress[] = {
 	MLXSW_SP_SB_PM(0, 0xff),
 	MLXSW_SP_SB_PM(0, 0),
 	MLXSW_SP_SB_PM(0, 0),
-	MLXSW_SP_SB_PM(0, 0),
+	MLXSW_SP_SB_PM(0, 0xff),
 };
 
 #define MLXSW_SP_SB_PMS_INGRESS_LEN ARRAY_SIZE(mlxsw_sp_sb_pms_ingress)