mlxsw: spectrum: Query cell size from firmware

As explained in the previous patch, the cell size may change in future
devices, so query it from the firmware instead of hard coding it.

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

4 files changed, 119 insertions, 83 deletions

diff --git a/drivers/net/ethernet/mellanox/mlxsw/resources.h b/drivers/net/ethernet/mellanox/mlxsw/resources.h
index 41553a79d99d..ee097691fa8c 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/resources.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/resources.h
@@ -50,6 +50,7 @@ enum mlxsw_res_id {
 	MLXSW_RES_ID_MAX_LAG,
 	MLXSW_RES_ID_MAX_LAG_MEMBERS,
 	MLXSW_RES_ID_MAX_BUFFER_SIZE,
+	MLXSW_RES_ID_CELL_SIZE,
 	MLXSW_RES_ID_ACL_MAX_TCAM_REGIONS,
 	MLXSW_RES_ID_ACL_MAX_TCAM_RULES,
 	MLXSW_RES_ID_ACL_MAX_REGIONS,
@@ -85,6 +86,7 @@ static u16 mlxsw_res_ids[] = {
 	[MLXSW_RES_ID_MAX_LAG] = 0x2520,
 	[MLXSW_RES_ID_MAX_LAG_MEMBERS] = 0x2521,
 	[MLXSW_RES_ID_MAX_BUFFER_SIZE] = 0x2802,	/* Bytes */
+	[MLXSW_RES_ID_CELL_SIZE] = 0x2803,	/* Bytes */
 	[MLXSW_RES_ID_ACL_MAX_TCAM_REGIONS] = 0x2901,
 	[MLXSW_RES_ID_ACL_MAX_TCAM_RULES] = 0x2902,
 	[MLXSW_RES_ID_ACL_MAX_REGIONS] = 0x2903,
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index c440b351a0e4..eabfe5c22b05 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -359,9 +359,10 @@ static bool mlxsw_sp_span_is_egress_mirror(struct mlxsw_sp_port *port)
 	return false;
 }
 
-static int mlxsw_sp_span_mtu_to_buffsize(int mtu)
+static int mlxsw_sp_span_mtu_to_buffsize(const struct mlxsw_sp *mlxsw_sp,
+					 int mtu)
 {
-	return MLXSW_SP_BYTES_TO_CELLS(mtu * 5 / 2) + 1;
+	return mlxsw_sp_bytes_cells(mlxsw_sp, mtu * 5 / 2) + 1;
 }
 
 static int mlxsw_sp_span_port_mtu_update(struct mlxsw_sp_port *port, u16 mtu)
@@ -374,8 +375,9 @@ static int mlxsw_sp_span_port_mtu_update(struct mlxsw_sp_port *port, u16 mtu)
 	 * updated according to the mtu value
 	 */
 	if (mlxsw_sp_span_is_egress_mirror(port)) {
-		mlxsw_reg_sbib_pack(sbib_pl, port->local_port,
-				    mlxsw_sp_span_mtu_to_buffsize(mtu));
+		u32 buffsize = mlxsw_sp_span_mtu_to_buffsize(mlxsw_sp, mtu);
+
+		mlxsw_reg_sbib_pack(sbib_pl, port->local_port, buffsize);
 		err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(sbib), sbib_pl);
 		if (err) {
 			netdev_err(port->dev, "Could not update shared buffer for mirroring\n");
@@ -412,8 +414,10 @@ mlxsw_sp_span_inspected_port_bind(struct mlxsw_sp_port *port,
 
 	/* if it is an egress SPAN, bind a shared buffer to it */
 	if (type == MLXSW_SP_SPAN_EGRESS) {
-		mlxsw_reg_sbib_pack(sbib_pl, port->local_port,
-				    mlxsw_sp_span_mtu_to_buffsize(port->dev->mtu));
+		u32 buffsize = mlxsw_sp_span_mtu_to_buffsize(mlxsw_sp,
+							     port->dev->mtu);
+
+		mlxsw_reg_sbib_pack(sbib_pl, port->local_port, buffsize);
 		err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(sbib), sbib_pl);
 		if (err) {
 			netdev_err(port->dev, "Could not create shared buffer for mirroring\n");
@@ -800,28 +804,35 @@ static int mlxsw_sp_port_set_mac_address(struct net_device *dev, void *p)
 	return 0;
 }
 
-static u16 mlxsw_sp_pg_buf_threshold_get(int mtu)
+static u16 mlxsw_sp_pg_buf_threshold_get(const struct mlxsw_sp *mlxsw_sp,
+					 int mtu)
 {
-	return 2 * MLXSW_SP_BYTES_TO_CELLS(mtu);
+	return 2 * mlxsw_sp_bytes_cells(mlxsw_sp, mtu);
 }
 
 #define MLXSW_SP_CELL_FACTOR 2	/* 2 * cell_size / (IPG + cell_size + 1) */
-static u16 mlxsw_sp_pfc_delay_get(int mtu, u16 delay)
+
+static u16 mlxsw_sp_pfc_delay_get(const struct mlxsw_sp *mlxsw_sp, int mtu,
+				  u16 delay)
 {
-	delay = MLXSW_SP_BYTES_TO_CELLS(DIV_ROUND_UP(delay, BITS_PER_BYTE));
-	return MLXSW_SP_CELL_FACTOR * delay + MLXSW_SP_BYTES_TO_CELLS(mtu);
+	delay = mlxsw_sp_bytes_cells(mlxsw_sp, DIV_ROUND_UP(delay,
+							    BITS_PER_BYTE));
+	return MLXSW_SP_CELL_FACTOR * delay + mlxsw_sp_bytes_cells(mlxsw_sp,
+								   mtu);
 }
 
-/* Maximum delay buffer needed in case of PAUSE frames, in cells.
+/* Maximum delay buffer needed in case of PAUSE frames, in bytes.
  * Assumes 100m cable and maximum MTU.
  */
-#define MLXSW_SP_PAUSE_DELAY 612
-static u16 mlxsw_sp_pg_buf_delay_get(int mtu, u16 delay, bool pfc, bool pause)
+#define MLXSW_SP_PAUSE_DELAY 58752
+
+static u16 mlxsw_sp_pg_buf_delay_get(const struct mlxsw_sp *mlxsw_sp, int mtu,
+				     u16 delay, bool pfc, bool pause)
 {
 	if (pfc)
-		return mlxsw_sp_pfc_delay_get(mtu, delay);
+		return mlxsw_sp_pfc_delay_get(mlxsw_sp, mtu, delay);
 	else if (pause)
-		return MLXSW_SP_PAUSE_DELAY;
+		return mlxsw_sp_bytes_cells(mlxsw_sp, MLXSW_SP_PAUSE_DELAY);
 	else
 		return 0;
 }
@@ -869,8 +880,9 @@ int __mlxsw_sp_port_headroom_set(struct mlxsw_sp_port *mlxsw_sp_port, int mtu,
 			continue;
 
 		lossy = !(pfc || pause_en);
-		thres = mlxsw_sp_pg_buf_threshold_get(mtu);
-		delay = mlxsw_sp_pg_buf_delay_get(mtu, delay, pfc, pause_en);
+		thres = mlxsw_sp_pg_buf_threshold_get(mlxsw_sp, mtu);
+		delay = mlxsw_sp_pg_buf_delay_get(mlxsw_sp, mtu, delay, pfc,
+						  pause_en);
 		mlxsw_sp_pg_buf_pack(pbmc_pl, i, thres + delay, thres, lossy);
 	}
 
@@ -1577,6 +1589,7 @@ err_port_pause_configure:
 struct mlxsw_sp_port_hw_stats {
 	char str[ETH_GSTRING_LEN];
 	u64 (*getter)(const char *payload);
+	bool cells_bytes;
 };
 
 static struct mlxsw_sp_port_hw_stats mlxsw_sp_port_hw_stats[] = {
@@ -1697,17 +1710,11 @@ static struct mlxsw_sp_port_hw_stats mlxsw_sp_port_hw_prio_stats[] = {
 
 #define MLXSW_SP_PORT_HW_PRIO_STATS_LEN ARRAY_SIZE(mlxsw_sp_port_hw_prio_stats)
 
-static u64 mlxsw_reg_ppcnt_tc_transmit_queue_bytes_get(const char *ppcnt_pl)
-{
-	u64 transmit_queue = mlxsw_reg_ppcnt_tc_transmit_queue_get(ppcnt_pl);
-
-	return MLXSW_SP_CELLS_TO_BYTES(transmit_queue);
-}
-
 static struct mlxsw_sp_port_hw_stats mlxsw_sp_port_hw_tc_stats[] = {
 	{
 		.str = "tc_transmit_queue_tc",
-		.getter = mlxsw_reg_ppcnt_tc_transmit_queue_bytes_get,
+		.getter = mlxsw_reg_ppcnt_tc_transmit_queue_get,
+		.cells_bytes = true,
 	},
 	{
 		.str = "tc_no_buffer_discard_uc_tc",
@@ -1819,6 +1826,8 @@ static void __mlxsw_sp_port_get_stats(struct net_device *dev,
 				      enum mlxsw_reg_ppcnt_grp grp, int prio,
 				      u64 *data, int data_index)
 {
+	struct mlxsw_sp_port *mlxsw_sp_port = netdev_priv(dev);
+	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
 	struct mlxsw_sp_port_hw_stats *hw_stats;
 	char ppcnt_pl[MLXSW_REG_PPCNT_LEN];
 	int i, len;
@@ -1828,8 +1837,13 @@ static void __mlxsw_sp_port_get_stats(struct net_device *dev,
 	if (err)
 		return;
 	mlxsw_sp_port_get_stats_raw(dev, grp, prio, ppcnt_pl);
-	for (i = 0; i < len; i++)
+	for (i = 0; i < len; i++) {
 		data[data_index + i] = hw_stats[i].getter(ppcnt_pl);
+		if (!hw_stats[i].cells_bytes)
+			continue;
+		data[data_index + i] = mlxsw_sp_cells_bytes(mlxsw_sp,
+							    data[data_index + i]);
+	}
 }
 
 static void mlxsw_sp_port_get_stats(struct net_device *dev,
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
index 958acac91ba8..3025b766fea1 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.h
@@ -65,11 +65,6 @@
 
 #define MLXSW_SP_PORT_BASE_SPEED 25000	/* Mb/s */
 
-#define MLXSW_SP_BYTES_PER_CELL 96
-
-#define MLXSW_SP_BYTES_TO_CELLS(b) DIV_ROUND_UP(b, MLXSW_SP_BYTES_PER_CELL)
-#define MLXSW_SP_CELLS_TO_BYTES(c) (c * MLXSW_SP_BYTES_PER_CELL)
-
 #define MLXSW_SP_KVD_LINEAR_SIZE 65536 /* entries */
 #define MLXSW_SP_KVD_GRANULARITY 128
 
@@ -147,6 +142,7 @@ struct mlxsw_sp_sb_port {
 struct mlxsw_sp_sb {
 	struct mlxsw_sp_sb_pr prs[2][MLXSW_SP_SB_POOL_COUNT];
 	struct mlxsw_sp_sb_port *ports;
+	u32 cell_size;
 };
 
 #define MLXSW_SP_PREFIX_COUNT (sizeof(struct in6_addr) * BITS_PER_BYTE)
@@ -284,6 +280,18 @@ mlxsw_sp_lag_get(struct mlxsw_sp *mlxsw_sp, u16 lag_id)
 	return &mlxsw_sp->lags[lag_id];
 }
 
+static inline u32 mlxsw_sp_cells_bytes(const struct mlxsw_sp *mlxsw_sp,
+				       u32 cells)
+{
+	return mlxsw_sp->sb.cell_size * cells;
+}
+
+static inline u32 mlxsw_sp_bytes_cells(const struct mlxsw_sp *mlxsw_sp,
+				       u32 bytes)
+{
+	return DIV_ROUND_UP(bytes, mlxsw_sp->sb.cell_size);
+}
+
 struct mlxsw_sp_port_pcpu_stats {
 	u64			rx_packets;
 	u64			rx_bytes;
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c
index 7e67d0e5b7f3..997189cfe7fd 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c
@@ -162,8 +162,8 @@ static int mlxsw_sp_sb_pm_occ_query(struct mlxsw_sp *mlxsw_sp, u8 local_port,
 }
 
 static const u16 mlxsw_sp_pbs[] = {
-	[0] = 2 * MLXSW_SP_BYTES_TO_CELLS(ETH_FRAME_LEN),
-	[9] = 2 * MLXSW_SP_BYTES_TO_CELLS(MLXSW_PORT_MAX_MTU),
+	[0] = 2 * ETH_FRAME_LEN,
+	[9] = 2 * MLXSW_PORT_MAX_MTU,
 };
 
 #define MLXSW_SP_PBS_LEN ARRAY_SIZE(mlxsw_sp_pbs)
@@ -171,20 +171,22 @@ static const u16 mlxsw_sp_pbs[] = {
 
 static int mlxsw_sp_port_pb_init(struct mlxsw_sp_port *mlxsw_sp_port)
 {
+	struct mlxsw_sp *mlxsw_sp = mlxsw_sp_port->mlxsw_sp;
 	char pbmc_pl[MLXSW_REG_PBMC_LEN];
 	int i;
 
 	mlxsw_reg_pbmc_pack(pbmc_pl, mlxsw_sp_port->local_port,
 			    0xffff, 0xffff / 2);
 	for (i = 0; i < MLXSW_SP_PBS_LEN; i++) {
+		u16 size = mlxsw_sp_bytes_cells(mlxsw_sp, mlxsw_sp_pbs[i]);
+
 		if (i == MLXSW_SP_PB_UNUSED)
 			continue;
-		mlxsw_reg_pbmc_lossy_buffer_pack(pbmc_pl, i, mlxsw_sp_pbs[i]);
+		mlxsw_reg_pbmc_lossy_buffer_pack(pbmc_pl, i, size);
 	}
 	mlxsw_reg_pbmc_lossy_buffer_pack(pbmc_pl,
 					 MLXSW_REG_PBMC_PORT_SHARED_BUF_IDX, 0);
-	return mlxsw_reg_write(mlxsw_sp_port->mlxsw_sp->core,
-			       MLXSW_REG(pbmc), pbmc_pl);
+	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(pbmc), pbmc_pl);
 }
 
 static int mlxsw_sp_port_pb_prio_init(struct mlxsw_sp_port *mlxsw_sp_port)
@@ -237,18 +239,17 @@ static void mlxsw_sp_sb_ports_fini(struct mlxsw_sp *mlxsw_sp)
 
 static const struct mlxsw_sp_sb_pr mlxsw_sp_sb_prs_ingress[] = {
 	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC,
-		       MLXSW_SP_BYTES_TO_CELLS(MLXSW_SP_SB_PR_INGRESS_SIZE)),
+		       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,
-		       MLXSW_SP_BYTES_TO_CELLS(MLXSW_SP_SB_PR_INGRESS_MNG_SIZE)),
+		       MLXSW_SP_SB_PR_INGRESS_MNG_SIZE),
 };
 
 #define MLXSW_SP_SB_PRS_INGRESS_LEN ARRAY_SIZE(mlxsw_sp_sb_prs_ingress)
 
 static const struct mlxsw_sp_sb_pr mlxsw_sp_sb_prs_egress[] = {
-	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC,
-		       MLXSW_SP_BYTES_TO_CELLS(MLXSW_SP_SB_PR_EGRESS_SIZE)),
+	MLXSW_SP_SB_PR(MLXSW_REG_SBPR_MODE_DYNAMIC, MLXSW_SP_SB_PR_EGRESS_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),
@@ -265,11 +266,9 @@ static int __mlxsw_sp_sb_prs_init(struct mlxsw_sp *mlxsw_sp,
 	int err;
 
 	for (i = 0; i < prs_len; i++) {
-		const struct mlxsw_sp_sb_pr *pr;
+		u32 size = mlxsw_sp_bytes_cells(mlxsw_sp, prs[i].size);
 
-		pr = &prs[i];
-		err = mlxsw_sp_sb_pr_write(mlxsw_sp, i, dir,
-					   pr->mode, pr->size);
+		err = mlxsw_sp_sb_pr_write(mlxsw_sp, i, dir, prs[i].mode, size);
 		if (err)
 			return err;
 	}
@@ -298,7 +297,7 @@ static int mlxsw_sp_sb_prs_init(struct mlxsw_sp *mlxsw_sp)
 	}
 
 static const struct mlxsw_sp_sb_cm mlxsw_sp_sb_cms_ingress[] = {
-	MLXSW_SP_SB_CM(MLXSW_SP_BYTES_TO_CELLS(10000), 8, 0),
+	MLXSW_SP_SB_CM(10000, 8, 0),
 	MLXSW_SP_SB_CM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN, 0),
 	MLXSW_SP_SB_CM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN, 0),
 	MLXSW_SP_SB_CM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN, 0),
@@ -307,20 +306,20 @@ static const struct mlxsw_sp_sb_cm mlxsw_sp_sb_cms_ingress[] = {
 	MLXSW_SP_SB_CM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN, 0),
 	MLXSW_SP_SB_CM(0, MLXSW_REG_SBXX_DYN_MAX_BUFF_MIN, 0),
 	MLXSW_SP_SB_CM(0, 0, 0), /* dummy, this PG does not exist */
-	MLXSW_SP_SB_CM(MLXSW_SP_BYTES_TO_CELLS(20000), 1, 3),
+	MLXSW_SP_SB_CM(20000, 1, 3),
 };
 
 #define MLXSW_SP_SB_CMS_INGRESS_LEN ARRAY_SIZE(mlxsw_sp_sb_cms_ingress)
 
 static const struct mlxsw_sp_sb_cm mlxsw_sp_sb_cms_egress[] = {
-	MLXSW_SP_SB_CM(MLXSW_SP_BYTES_TO_CELLS(1500), 9, 0),
-	MLXSW_SP_SB_CM(MLXSW_SP_BYTES_TO_CELLS(1500), 9, 0),
-	MLXSW_SP_SB_CM(MLXSW_SP_BYTES_TO_CELLS(1500), 9, 0),
-	MLXSW_SP_SB_CM(MLXSW_SP_BYTES_TO_CELLS(1500), 9, 0),
-	MLXSW_SP_SB_CM(MLXSW_SP_BYTES_TO_CELLS(1500), 9, 0),
-	MLXSW_SP_SB_CM(MLXSW_SP_BYTES_TO_CELLS(1500), 9, 0),
-	MLXSW_SP_SB_CM(MLXSW_SP_BYTES_TO_CELLS(1500), 9, 0),
-	MLXSW_SP_SB_CM(MLXSW_SP_BYTES_TO_CELLS(1500), 9, 0),
+	MLXSW_SP_SB_CM(1500, 9, 0),
+	MLXSW_SP_SB_CM(1500, 9, 0),
+	MLXSW_SP_SB_CM(1500, 9, 0),
+	MLXSW_SP_SB_CM(1500, 9, 0),
+	MLXSW_SP_SB_CM(1500, 9, 0),
+	MLXSW_SP_SB_CM(1500, 9, 0),
+	MLXSW_SP_SB_CM(1500, 9, 0),
+	MLXSW_SP_SB_CM(1500, 9, 0),
 	MLXSW_SP_SB_CM(0, 0, 0),
 	MLXSW_SP_SB_CM(0, 0, 0),
 	MLXSW_SP_SB_CM(0, 0, 0),
@@ -344,7 +343,7 @@ static const struct mlxsw_sp_sb_cm mlxsw_sp_cpu_port_sb_cms[] = {
 	MLXSW_SP_CPU_PORT_SB_CM,
 	MLXSW_SP_CPU_PORT_SB_CM,
 	MLXSW_SP_CPU_PORT_SB_CM,
-	MLXSW_SP_SB_CM(MLXSW_SP_BYTES_TO_CELLS(10000), 0, 0),
+	MLXSW_SP_SB_CM(10000, 0, 0),
 	MLXSW_SP_CPU_PORT_SB_CM,
 	MLXSW_SP_CPU_PORT_SB_CM,
 	MLXSW_SP_CPU_PORT_SB_CM,
@@ -384,13 +383,17 @@ static int __mlxsw_sp_sb_cms_init(struct mlxsw_sp *mlxsw_sp, u8 local_port,
 
 	for (i = 0; i < cms_len; i++) {
 		const struct mlxsw_sp_sb_cm *cm;
+		u32 min_buff;
 
 		if (i == 8 && dir == MLXSW_REG_SBXX_DIR_INGRESS)
 			continue; /* PG number 8 does not exist, skip it */
 		cm = &cms[i];
+		/* All pools are initialized using dynamic thresholds,
+		 * therefore 'max_buff' isn't specified in cells.
+		 */
+		min_buff = mlxsw_sp_bytes_cells(mlxsw_sp, cm->min_buff);
 		err = mlxsw_sp_sb_cm_write(mlxsw_sp, local_port, i, dir,
-					   cm->min_buff, cm->max_buff,
-					   cm->pool);
+					   min_buff, cm->max_buff, cm->pool);
 		if (err)
 			return err;
 	}
@@ -498,21 +501,21 @@ struct mlxsw_sp_sb_mm {
 	}
 
 static const struct mlxsw_sp_sb_mm mlxsw_sp_sb_mms[] = {
-	MLXSW_SP_SB_MM(MLXSW_SP_BYTES_TO_CELLS(20000), 0xff, 0),
-	MLXSW_SP_SB_MM(MLXSW_SP_BYTES_TO_CELLS(20000), 0xff, 0),
-	MLXSW_SP_SB_MM(MLXSW_SP_BYTES_TO_CELLS(20000), 0xff, 0),
-	MLXSW_SP_SB_MM(MLXSW_SP_BYTES_TO_CELLS(20000), 0xff, 0),
-	MLXSW_SP_SB_MM(MLXSW_SP_BYTES_TO_CELLS(20000), 0xff, 0),
-	MLXSW_SP_SB_MM(MLXSW_SP_BYTES_TO_CELLS(20000), 0xff, 0),
-	MLXSW_SP_SB_MM(MLXSW_SP_BYTES_TO_CELLS(20000), 0xff, 0),
-	MLXSW_SP_SB_MM(MLXSW_SP_BYTES_TO_CELLS(20000), 0xff, 0),
-	MLXSW_SP_SB_MM(MLXSW_SP_BYTES_TO_CELLS(20000), 0xff, 0),
-	MLXSW_SP_SB_MM(MLXSW_SP_BYTES_TO_CELLS(20000), 0xff, 0),
-	MLXSW_SP_SB_MM(MLXSW_SP_BYTES_TO_CELLS(20000), 0xff, 0),
-	MLXSW_SP_SB_MM(MLXSW_SP_BYTES_TO_CELLS(20000), 0xff, 0),
-	MLXSW_SP_SB_MM(MLXSW_SP_BYTES_TO_CELLS(20000), 0xff, 0),
-	MLXSW_SP_SB_MM(MLXSW_SP_BYTES_TO_CELLS(20000), 0xff, 0),
-	MLXSW_SP_SB_MM(MLXSW_SP_BYTES_TO_CELLS(20000), 0xff, 0),
+	MLXSW_SP_SB_MM(20000, 0xff, 0),
+	MLXSW_SP_SB_MM(20000, 0xff, 0),
+	MLXSW_SP_SB_MM(20000, 0xff, 0),
+	MLXSW_SP_SB_MM(20000, 0xff, 0),
+	MLXSW_SP_SB_MM(20000, 0xff, 0),
+	MLXSW_SP_SB_MM(20000, 0xff, 0),
+	MLXSW_SP_SB_MM(20000, 0xff, 0),
+	MLXSW_SP_SB_MM(20000, 0xff, 0),
+	MLXSW_SP_SB_MM(20000, 0xff, 0),
+	MLXSW_SP_SB_MM(20000, 0xff, 0),
+	MLXSW_SP_SB_MM(20000, 0xff, 0),
+	MLXSW_SP_SB_MM(20000, 0xff, 0),
+	MLXSW_SP_SB_MM(20000, 0xff, 0),
+	MLXSW_SP_SB_MM(20000, 0xff, 0),
+	MLXSW_SP_SB_MM(20000, 0xff, 0),
 };
 
 #define MLXSW_SP_SB_MMS_LEN ARRAY_SIZE(mlxsw_sp_sb_mms)
@@ -525,10 +528,15 @@ static int mlxsw_sp_sb_mms_init(struct mlxsw_sp *mlxsw_sp)
 
 	for (i = 0; i < MLXSW_SP_SB_MMS_LEN; i++) {
 		const struct mlxsw_sp_sb_mm *mc;
+		u32 min_buff;
 
 		mc = &mlxsw_sp_sb_mms[i];
-		mlxsw_reg_sbmm_pack(sbmm_pl, i, mc->min_buff,
-				    mc->max_buff, mc->pool);
+		/* All pools are initialized using dynamic thresholds,
+		 * therefore 'max_buff' isn't specified in cells.
+		 */
+		min_buff = mlxsw_sp_bytes_cells(mlxsw_sp, mc->min_buff);
+		mlxsw_reg_sbmm_pack(sbmm_pl, i, min_buff, mc->max_buff,
+				    mc->pool);
 		err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(sbmm), sbmm_pl);
 		if (err)
 			return err;
@@ -541,6 +549,10 @@ int mlxsw_sp_buffers_init(struct mlxsw_sp *mlxsw_sp)
 	u64 sb_size;
 	int err;
 
+	if (!MLXSW_CORE_RES_VALID(mlxsw_sp->core, CELL_SIZE))
+		return -EIO;
+	mlxsw_sp->sb.cell_size = MLXSW_CORE_RES_GET(mlxsw_sp->core, CELL_SIZE);
+
 	if (!MLXSW_CORE_RES_VALID(mlxsw_sp->core, MAX_BUFFER_SIZE))
 		return -EIO;
 	sb_size = MLXSW_CORE_RES_GET(mlxsw_sp->core, MAX_BUFFER_SIZE);
@@ -627,7 +639,7 @@ int mlxsw_sp_sb_pool_get(struct mlxsw_core *mlxsw_core,
 	struct mlxsw_sp_sb_pr *pr = mlxsw_sp_sb_pr_get(mlxsw_sp, pool, dir);
 
 	pool_info->pool_type = (enum devlink_sb_pool_type) dir;
-	pool_info->size = MLXSW_SP_CELLS_TO_BYTES(pr->size);
+	pool_info->size = mlxsw_sp_cells_bytes(mlxsw_sp, pr->size);
 	pool_info->threshold_type = (enum devlink_sb_threshold_type) pr->mode;
 	return 0;
 }
@@ -637,9 +649,9 @@ int mlxsw_sp_sb_pool_set(struct mlxsw_core *mlxsw_core,
 			 enum devlink_sb_threshold_type threshold_type)
 {
 	struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
+	u32 pool_size = mlxsw_sp_bytes_cells(mlxsw_sp, size);
 	u8 pool = pool_get(pool_index);
 	enum mlxsw_reg_sbxx_dir dir = dir_get(pool_index);
-	u32 pool_size = MLXSW_SP_BYTES_TO_CELLS(size);
 	enum mlxsw_reg_sbpr_mode mode;
 
 	if (size > MLXSW_CORE_RES_GET(mlxsw_sp->core, MAX_BUFFER_SIZE))
@@ -658,7 +670,7 @@ static u32 mlxsw_sp_sb_threshold_out(struct mlxsw_sp *mlxsw_sp, u8 pool,
 
 	if (pr->mode == MLXSW_REG_SBPR_MODE_DYNAMIC)
 		return max_buff - MLXSW_SP_SB_THRESHOLD_TO_ALPHA_OFFSET;
-	return MLXSW_SP_CELLS_TO_BYTES(max_buff);
+	return mlxsw_sp_cells_bytes(mlxsw_sp, max_buff);
 }
 
 static int mlxsw_sp_sb_threshold_in(struct mlxsw_sp *mlxsw_sp, u8 pool,
@@ -676,7 +688,7 @@ static int mlxsw_sp_sb_threshold_in(struct mlxsw_sp *mlxsw_sp, u8 pool,
 			return -EINVAL;
 		*p_max_buff = val;
 	} else {
-		*p_max_buff = MLXSW_SP_BYTES_TO_CELLS(threshold);
+		*p_max_buff = mlxsw_sp_bytes_cells(mlxsw_sp, threshold);
 	}
 	return 0;
 }
@@ -963,8 +975,8 @@ int mlxsw_sp_sb_occ_port_pool_get(struct mlxsw_core_port *mlxsw_core_port,
 	struct mlxsw_sp_sb_pm *pm = mlxsw_sp_sb_pm_get(mlxsw_sp, local_port,
 						       pool, dir);
 
-	*p_cur = MLXSW_SP_CELLS_TO_BYTES(pm->occ.cur);
-	*p_max = MLXSW_SP_CELLS_TO_BYTES(pm->occ.max);
+	*p_cur = mlxsw_sp_cells_bytes(mlxsw_sp, pm->occ.cur);
+	*p_max = mlxsw_sp_cells_bytes(mlxsw_sp, pm->occ.max);
 	return 0;
 }
 
@@ -982,7 +994,7 @@ int mlxsw_sp_sb_occ_tc_port_bind_get(struct mlxsw_core_port *mlxsw_core_port,
 	struct mlxsw_sp_sb_cm *cm = mlxsw_sp_sb_cm_get(mlxsw_sp, local_port,
 						       pg_buff, dir);
 
-	*p_cur = MLXSW_SP_CELLS_TO_BYTES(cm->occ.cur);
-	*p_max = MLXSW_SP_CELLS_TO_BYTES(cm->occ.max);
+	*p_cur = mlxsw_sp_cells_bytes(mlxsw_sp, cm->occ.cur);
+	*p_max = mlxsw_sp_cells_bytes(mlxsw_sp, cm->occ.max);
 	return 0;
 }