mlxsw: spectrum_buffers: Use new CPU ingress pool for control packets

Use the new ingress pool that was added in the previous patch for
control packets (e.g., STP, LACP) that are trapped to the CPU.

The previous management pool is no longer necessary and therefore its
size is set to 0.

The maximum quota for traffic towards the CPU is increased to 50% of the
free space in the new ingress pool and therefore the reserved space is
reduced by half, to 10KB - in both the shared and headroom buffer. This
allows for more efficient utilization of the shared buffer as reserved
space cannot be used for other purposes.
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -54,7 +54,6 @@ struct mlxsw_sp_sb_pool_des {
 };
 
 #define MLXSW_SP_SB_POOL_ING		0
-#define MLXSW_SP_SB_POOL_ING_MNG	3
 #define MLXSW_SP_SB_POOL_EGR		4
 #define MLXSW_SP_SB_POOL_EGR_MC		8
 #define MLXSW_SP_SB_POOL_ING_CPU	9
@@ -290,7 +289,7 @@ static int mlxsw_sp_port_pb_init(struct mlxsw_sp_port *mlxsw_sp_port)
 {
 	const u32 pbs[] = {
 		[0] = MLXSW_SP_PB_HEADROOM * mlxsw_sp_port->mapping.width,
-		[9] = 2 * MLXSW_PORT_MAX_MTU,
+		[9] = MLXSW_PORT_MAX_MTU,
 	};
 	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
 	char pbmc_pl[MLXSW_REG_PBMC_LEN];
@@ -414,7 +413,6 @@ static void mlxsw_sp_sb_ports_fini(struct mlxsw_sp *mlxsw_sp)
 	}
 
 #define MLXSW_SP1_SB_PR_INGRESS_SIZE	12440000
-#define MLXSW_SP1_SB_PR_INGRESS_MNG_SIZE (200 * 1000)
 #define MLXSW_SP1_SB_PR_EGRESS_SIZE	13232000
 #define MLXSW_SP1_SB_PR_CPU_SIZE	(256 * 1000)
 
@@ -424,8 +422,7 @@ static const struct mlxsw_sp_sb_pr mlxsw_sp1_sb_prs[] = {
 		       MLXSW_SP1_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,
-		       MLXSW_SP1_SB_PR_INGRESS_MNG_SIZE),
+	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, 0),
 	MLXSW_SP_SB_PR_EXT(MLXSW_REG_SBPR_MODE_DYNAMIC,
 			   MLXSW_SP1_SB_PR_EGRESS_SIZE, true, false),
 	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, 0),
@@ -440,7 +437,6 @@ static const struct mlxsw_sp_sb_pr mlxsw_sp1_sb_prs[] = {
 };
 
 #define MLXSW_SP2_SB_PR_INGRESS_SIZE	40960000
-#define MLXSW_SP2_SB_PR_INGRESS_MNG_SIZE (200 * 1000)
 #define MLXSW_SP2_SB_PR_EGRESS_SIZE	40960000
 #define MLXSW_SP2_SB_PR_CPU_SIZE	(256 * 1000)
 
@@ -450,8 +446,7 @@ static const struct mlxsw_sp_sb_pr mlxsw_sp2_sb_prs[] = {
 		       MLXSW_SP2_SB_PR_INGRESS_SIZE),
 	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_STATIC, 0),
 	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_STATIC, 0),
-	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC,
-		       MLXSW_SP2_SB_PR_INGRESS_MNG_SIZE),
+	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_STATIC, 0),
 	MLXSW_SP_SB_PR_EXT(MLXSW_REG_SBPR_MODE_DYNAMIC,
 			   MLXSW_SP2_SB_PR_EGRESS_SIZE, true, false),
 	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_STATIC, 0),
@@ -530,7 +525,7 @@ static const struct mlxsw_sp_sb_cm mlxsw_sp1_sb_cms_ingress[] = {
 	MLXSW_SP_SB_CM_ING(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
 	MLXSW_SP_SB_CM_ING(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
 	MLXSW_SP_SB_CM_ING(0, 0), /* dummy, this PG does not exist */
-	MLXSW_SP_SB_CM(20000, 1, MLXSW_SP_SB_POOL_ING_MNG),
+	MLXSW_SP_SB_CM(10000, 8, MLXSW_SP_SB_POOL_ING_CPU),
 };
 
 static const struct mlxsw_sp_sb_cm mlxsw_sp2_sb_cms_ingress[] = {
@@ -543,7 +538,7 @@ static const struct mlxsw_sp_sb_cm mlxsw_sp2_sb_cms_ingress[] = {
 	MLXSW_SP_SB_CM_ING(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
 	MLXSW_SP_SB_CM_ING(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
 	MLXSW_SP_SB_CM_ING(0, 0), /* dummy, this PG does not exist */
-	MLXSW_SP_SB_CM(20000, 1, MLXSW_SP_SB_POOL_ING_MNG),
+	MLXSW_SP_SB_CM(10000, 8, MLXSW_SP_SB_POOL_ING_CPU),
 };
 
 static const struct mlxsw_sp_sb_cm mlxsw_sp1_sb_cms_egress[] = {
@@ -709,7 +704,7 @@ static const struct mlxsw_sp_sb_pm mlxsw_sp1_sb_pms[] = {
 	MLXSW_SP_SB_PM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MAX),
 	MLXSW_SP_SB_PM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
 	MLXSW_SP_SB_PM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
-	MLXSW_SP_SB_PM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MAX),
+	MLXSW_SP_SB_PM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
 	MLXSW_SP_SB_PM(0, 7),
 	MLXSW_SP_SB_PM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
 	MLXSW_SP_SB_PM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
@@ -724,7 +719,7 @@ static const struct mlxsw_sp_sb_pm mlxsw_sp2_sb_pms[] = {
 	MLXSW_SP_SB_PM(0, 7),
 	MLXSW_SP_SB_PM(0, 0),
 	MLXSW_SP_SB_PM(0, 0),
-	MLXSW_SP_SB_PM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MAX),
+	MLXSW_SP_SB_PM(0, 0),
 	MLXSW_SP_SB_PM(0, 7),
 	MLXSW_SP_SB_PM(0, 0),
 	MLXSW_SP_SB_PM(0, 0),