[PATCH net-next 07/13] net: enetc: offload per-tc max SDU from tc-taprio

[Vladimir Oltean]

The driver currently sets the PTCMSDUR register statically to the max
MTU supported by the interface. Keep this logic if tc-taprio is absent
or if the max_sdu for a traffic class is 0, and follow the requested max
SDU size otherwise.

Signed-off-by: Vladimir Oltean <vladimir.oltean@xxxxxxx>
---
 drivers/net/ethernet/freescale/enetc/enetc.h  |  3 +++
 .../net/ethernet/freescale/enetc/enetc_pf.c   | 25 ++++++++++++++++---
 .../net/ethernet/freescale/enetc/enetc_qos.c  | 10 +++++---
 3 files changed, 32 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc.h b/drivers/net/ethernet/freescale/enetc/enetc.h
index f4cf12c743fe..4d0bdfef51b7 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc.h
@@ -455,6 +455,9 @@ static inline void enetc_cbd_free_data_mem(struct enetc_si *si, int size,
 			  data, *dma);
 }
 
+void enetc_reset_ptcmsdur(struct enetc_hw *hw);
+void enetc_set_ptcmsdur(struct enetc_hw *hw, u32 *queue_max_sdu);
+
 #ifdef CONFIG_FSL_ENETC_QOS
 int enetc_setup_tc_taprio(struct net_device *ndev, void *type_data);
 void enetc_sched_speed_set(struct enetc_ndev_priv *priv, int speed);
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pf.c b/drivers/net/ethernet/freescale/enetc/enetc_pf.c
index c4a0e836d4f0..03275846f416 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_pf.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_pf.c
@@ -516,15 +516,34 @@ static void enetc_port_si_configure(struct enetc_si *si)
 	enetc_port_wr(hw, ENETC_PSIVLANFMR, ENETC_PSIVLANFMR_VS);
 }
 
-static void enetc_configure_port_mac(struct enetc_hw *hw)
+void enetc_set_ptcmsdur(struct enetc_hw *hw, u32 *max_sdu)
 {
 	int tc;
 
-	enetc_port_wr(hw, ENETC_PM0_MAXFRM,
-		      ENETC_SET_MAXFRM(ENETC_RX_MAXFRM_SIZE));
+	for (tc = 0; tc < 8; tc++) {
+		u32 val = ENETC_MAC_MAXFRM_SIZE;
+
+		if (max_sdu[tc])
+			val = max_sdu[tc] + VLAN_ETH_HLEN;
+
+		enetc_port_wr(hw, ENETC_PTCMSDUR(tc), val);
+	}
+}
+
+void enetc_reset_ptcmsdur(struct enetc_hw *hw)
+{
+	int tc;
 
 	for (tc = 0; tc < 8; tc++)
 		enetc_port_wr(hw, ENETC_PTCMSDUR(tc), ENETC_MAC_MAXFRM_SIZE);
+}
+
+static void enetc_configure_port_mac(struct enetc_hw *hw)
+{
+	enetc_port_wr(hw, ENETC_PM0_MAXFRM,
+		      ENETC_SET_MAXFRM(ENETC_RX_MAXFRM_SIZE));
+
+	enetc_reset_ptcmsdur(hw);
 
 	enetc_port_wr(hw, ENETC_PM0_CMD_CFG, ENETC_PM0_CMD_PHY_TX_EN |
 		      ENETC_PM0_CMD_TXP	| ENETC_PM0_PROMISC);
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_qos.c b/drivers/net/ethernet/freescale/enetc/enetc_qos.c
index 29be8a1ecee1..a412f27bc4a4 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_qos.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_qos.c
@@ -68,6 +68,7 @@ static int enetc_setup_taprio(struct net_device *ndev,
 	tge = enetc_rd(hw, ENETC_QBV_PTGCR_OFFSET);
 	if (!admin_conf->enable) {
 		enetc_wr(hw, ENETC_QBV_PTGCR_OFFSET, tge & ~ENETC_QBV_TGE);
+		enetc_reset_ptcmsdur(hw);
 
 		priv->active_offloads &= ~ENETC_F_QBV;
 
@@ -123,10 +124,13 @@ static int enetc_setup_taprio(struct net_device *ndev,
 
 	enetc_cbd_free_data_mem(priv->si, data_size, tmp, &dma);
 
-	if (!err)
-		priv->active_offloads |= ENETC_F_QBV;
+	if (err)
+		return err;
 
-	return err;
+	enetc_set_ptcmsdur(hw, admin_conf->max_sdu);
+	priv->active_offloads |= ENETC_F_QBV;
+
+	return 0;
 }
 
 int enetc_setup_tc_taprio(struct net_device *ndev, void *type_data)
-- 
2.34.1