mlxsw: spectrum_buffers: Add pools for CPU traffic

Packets that are trapped to the CPU are transmitted through the CPU port
to the attached host. The CPU port is therefore like any other port and
needs to have shared buffer configuration.

The maximum quotas configured for the CPU are provided using dynamic
threshold and cannot be changed by the user. In order to make sure that
these thresholds are always valid, the configuration of the threshold
type of these pools is forbidden.
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Petr Machata <petrm@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -57,6 +57,8 @@ struct mlxsw_sp_sb_pool_des {
 #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
+#define MLXSW_SP_SB_POOL_EGR_CPU	10
 
 static const struct mlxsw_sp_sb_pool_des mlxsw_sp1_sb_pool_dess[] = {
 	{MLXSW_REG_SBXX_DIR_INGRESS, 0},
@@ -68,6 +70,8 @@ static const struct mlxsw_sp_sb_pool_des mlxsw_sp1_sb_pool_dess[] = {
 	{MLXSW_REG_SBXX_DIR_EGRESS, 2},
 	{MLXSW_REG_SBXX_DIR_EGRESS, 3},
 	{MLXSW_REG_SBXX_DIR_EGRESS, 15},
+	{MLXSW_REG_SBXX_DIR_INGRESS, 4},
+	{MLXSW_REG_SBXX_DIR_EGRESS, 4},
 };
 
 static const struct mlxsw_sp_sb_pool_des mlxsw_sp2_sb_pool_dess[] = {
@@ -80,6 +84,8 @@ static const struct mlxsw_sp_sb_pool_des mlxsw_sp2_sb_pool_dess[] = {
 	{MLXSW_REG_SBXX_DIR_EGRESS, 2},
 	{MLXSW_REG_SBXX_DIR_EGRESS, 3},
 	{MLXSW_REG_SBXX_DIR_EGRESS, 15},
+	{MLXSW_REG_SBXX_DIR_INGRESS, 4},
+	{MLXSW_REG_SBXX_DIR_EGRESS, 4},
 };
 
 #define MLXSW_SP_SB_ING_TC_COUNT 8
@@ -410,6 +416,7 @@ 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)
 
 /* Order according to mlxsw_sp1_sb_pool_dess */
 static const struct mlxsw_sp_sb_pr mlxsw_sp1_sb_prs[] = {
@@ -426,11 +433,16 @@ static const struct mlxsw_sp_sb_pr mlxsw_sp1_sb_prs[] = {
 	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, 0),
 	MLXSW_SP_SB_PR_EXT(MLXSW_REG_SBPR_MODE_STATIC, MLXSW_SP_SB_INFI,
 			   true, true),
+	MLXSW_SP_SB_PR_EXT(MLXSW_REG_SBPR_MODE_DYNAMIC,
+			   MLXSW_SP1_SB_PR_CPU_SIZE, true, false),
+	MLXSW_SP_SB_PR_EXT(MLXSW_REG_SBPR_MODE_DYNAMIC,
+			   MLXSW_SP1_SB_PR_CPU_SIZE, true, false),
 };
 
 #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)
 
 /* Order according to mlxsw_sp2_sb_pool_dess */
 static const struct mlxsw_sp_sb_pr mlxsw_sp2_sb_prs[] = {
@@ -447,6 +459,10 @@ static const struct mlxsw_sp_sb_pr mlxsw_sp2_sb_prs[] = {
 	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_STATIC, 0),
 	MLXSW_SP_SB_PR_EXT(MLXSW_REG_SBPR_MODE_STATIC, MLXSW_SP_SB_INFI,
 			   true, true),
+	MLXSW_SP_SB_PR_EXT(MLXSW_REG_SBPR_MODE_DYNAMIC,
+			   MLXSW_SP2_SB_PR_CPU_SIZE, true, false),
+	MLXSW_SP_SB_PR_EXT(MLXSW_REG_SBPR_MODE_DYNAMIC,
+			   MLXSW_SP2_SB_PR_CPU_SIZE, true, false),
 };
 
 static int mlxsw_sp_sb_prs_init(struct mlxsw_sp *mlxsw_sp,
@@ -699,6 +715,8 @@ static const struct mlxsw_sp_sb_pm mlxsw_sp1_sb_pms[] = {
 	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(10000, 90000),
+	MLXSW_SP_SB_PM(0, 8),	/* 50% occupancy */
+	MLXSW_SP_SB_PM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
 };
 
 /* Order according to mlxsw_sp2_sb_pool_dess */
@@ -712,6 +730,8 @@ static const struct mlxsw_sp_sb_pm mlxsw_sp2_sb_pms[] = {
 	MLXSW_SP_SB_PM(0, 0),
 	MLXSW_SP_SB_PM(0, 0),
 	MLXSW_SP_SB_PM(10000, 90000),
+	MLXSW_SP_SB_PM(0, 8),	/* 50% occupancy */
+	MLXSW_SP_SB_PM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN),
 };
 
 static int mlxsw_sp_port_sb_pms_init(struct mlxsw_sp_port *mlxsw_sp_port)