[net-next, 1/2] enetc: Configure the Time-Aware Scheduler via tc-taprio offload

[Po Liu <po.liu@nxp.com>]

ENETC supports in hardware for time-based egress shaping according
to IEEE 802.1Qbv. This patch implement the Qbv enablement by the
hardware offload method qdisc tc-taprio method.
Also update cbdr writeback to up level since control bd ring may
writeback data to control bd ring.

Signed-off-by: Po Liu <Po.Liu@nxp.com>
Singed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com>
---
 drivers/net/ethernet/freescale/enetc/Makefile |   1 +
 drivers/net/ethernet/freescale/enetc/enetc.c  |  19 ++-
 drivers/net/ethernet/freescale/enetc/enetc.h  |   2 +
 .../net/ethernet/freescale/enetc/enetc_cbdr.c |   5 +-
 .../net/ethernet/freescale/enetc/enetc_hw.h   | 150 ++++++++++++++++--
 .../net/ethernet/freescale/enetc/enetc_qos.c  | 130 +++++++++++++++
 6 files changed, 285 insertions(+), 22 deletions(-)
 create mode 100644 drivers/net/ethernet/freescale/enetc/enetc_qos.c

diff --git a/drivers/net/ethernet/freescale/enetc/Makefile b/drivers/net/ethernet/freescale/enetc/Makefile
index d200c27c3bf6..389f722efc43 100644
--- a/drivers/net/ethernet/freescale/enetc/Makefile
+++ b/drivers/net/ethernet/freescale/enetc/Makefile
@@ -5,6 +5,7 @@ common-objs := enetc.o enetc_cbdr.o enetc_ethtool.o
 obj-$(CONFIG_FSL_ENETC) += fsl-enetc.o
 fsl-enetc-y := enetc_pf.o enetc_mdio.o $(common-objs)
 fsl-enetc-$(CONFIG_PCI_IOV) += enetc_msg.o
+fsl-enetc-$(CONFIG_NET_SCH_TAPRIO) += enetc_qos.o
 
 obj-$(CONFIG_FSL_ENETC_VF) += fsl-enetc-vf.o
 fsl-enetc-vf-y := enetc_vf.o $(common-objs)
diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
index 3e8f9819f08c..d58dbc2c4270 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc.c
@@ -1427,8 +1427,7 @@ int enetc_close(struct net_device *ndev)
 	return 0;
 }
 
-int enetc_setup_tc(struct net_device *ndev, enum tc_setup_type type,
-		   void *type_data)
+int enetc_setup_tc_mqprio(struct net_device *ndev, void *type_data)
 {
 	struct enetc_ndev_priv *priv = netdev_priv(ndev);
 	struct tc_mqprio_qopt *mqprio = type_data;
@@ -1436,9 +1435,6 @@ int enetc_setup_tc(struct net_device *ndev, enum tc_setup_type type,
 	u8 num_tc;
 	int i;
 
-	if (type != TC_SETUP_QDISC_MQPRIO)
-		return -EOPNOTSUPP;
-
 	mqprio->hw = TC_MQPRIO_HW_OFFLOAD_TCS;
 	num_tc = mqprio->num_tc;
 
@@ -1483,6 +1479,19 @@ int enetc_setup_tc(struct net_device *ndev, enum tc_setup_type type,
 	return 0;
 }
 
+int enetc_setup_tc(struct net_device *ndev, enum tc_setup_type type,
+		   void *type_data)
+{
+	switch (type) {
+	case TC_SETUP_QDISC_MQPRIO:
+		return enetc_setup_tc_mqprio(ndev, type_data);
+	case TC_SETUP_QDISC_TAPRIO:
+		return enetc_setup_tc_taprio(ndev, type_data);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
 struct net_device_stats *enetc_get_stats(struct net_device *ndev)
 {
 	struct enetc_ndev_priv *priv = netdev_priv(ndev);
diff --git a/drivers/net/ethernet/freescale/enetc/enetc.h b/drivers/net/ethernet/freescale/enetc/enetc.h
index 541b4e2073fe..8676631041d5 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc.h
@@ -244,3 +244,5 @@ int enetc_set_fs_entry(struct enetc_si *si, struct enetc_cmd_rfse *rfse,
 void enetc_set_rss_key(struct enetc_hw *hw, const u8 *bytes);
 int enetc_get_rss_table(struct enetc_si *si, u32 *table, int count);
 int enetc_set_rss_table(struct enetc_si *si, const u32 *table, int count);
+int enetc_send_cmd(struct enetc_si *si, struct enetc_cbd *cbd);
+int enetc_setup_tc_taprio(struct net_device *ndev, void *type_data);
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_cbdr.c b/drivers/net/ethernet/freescale/enetc/enetc_cbdr.c
index de466b71bf8f..201cbc362e33 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_cbdr.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_cbdr.c
@@ -32,7 +32,7 @@ static int enetc_cbd_unused(struct enetc_cbdr *r)
 		r->bd_count;
 }
 
-static int enetc_send_cmd(struct enetc_si *si, struct enetc_cbd *cbd)
+int enetc_send_cmd(struct enetc_si *si, struct enetc_cbd *cbd)
 {
 	struct enetc_cbdr *ring = &si->cbd_ring;
 	int timeout = ENETC_CBDR_TIMEOUT;
@@ -66,6 +66,9 @@ static int enetc_send_cmd(struct enetc_si *si, struct enetc_cbd *cbd)
 	if (!timeout)
 		return -EBUSY;
 
+	/* CBD may writeback data, feedback up level */
+	*cbd = *dest_cbd;
+
 	enetc_clean_cbdr(si);
 
 	return 0;
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_hw.h b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
index 88276299f447..75a7c0f1f8ce 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_hw.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
@@ -18,6 +18,7 @@
 #define ENETC_SICTR0	0x18
 #define ENETC_SICTR1	0x1c
 #define ENETC_SIPCAPR0	0x20
+#define ENETC_SIPCAPR0_QBV	BIT(4)
 #define ENETC_SIPCAPR0_RSS	BIT(8)
 #define ENETC_SIPCAPR1	0x24
 #define ENETC_SITGTGR	0x30
@@ -148,6 +149,12 @@ enum enetc_bdr_type {TX, RX};
 #define ENETC_PORT_BASE		0x10000
 #define ENETC_PMR		0x0000
 #define ENETC_PMR_EN	GENMASK(18, 16)
+#define ENETC_PMR_PSPEED_MASK GENMASK(11, 8)
+#define ENETC_PMR_PSPEED_10M 0x000
+#define ENETC_PMR_PSPEED_100M 0x100
+#define ENETC_PMR_PSPEED_1000M 0x200
+#define ENETC_PMR_PSPEED_2500M 0x400
+
 #define ENETC_PSR		0x0004 /* RO */
 #define ENETC_PSIPMR		0x0018
 #define ENETC_PSIPMR_SET_UP(n)	BIT(n) /* n = SI index */
@@ -440,22 +447,6 @@ union enetc_rx_bd {
 #define EMETC_MAC_ADDR_FILT_RES	3 /* # of reserved entries at the beginning */
 #define ENETC_MAX_NUM_VFS	2
 
-struct enetc_cbd {
-	union {
-		struct {
-			__le32 addr[2];
-			__le32 opt[4];
-		};
-		__le32 data[6];
-	};
-	__le16 index;
-	__le16 length;
-	u8 cmd;
-	u8 cls;
-	u8 _res;
-	u8 status_flags;
-};
-
 #define ENETC_CBD_FLAGS_SF	BIT(7) /* short format */
 #define ENETC_CBD_STATUS_MASK	0xf
 
@@ -554,3 +545,130 @@ static inline void enetc_set_bdr_prio(struct enetc_hw *hw, int bdr_idx,
 	val |= ENETC_TBMR_SET_PRIO(prio);
 	enetc_txbdr_wr(hw, bdr_idx, ENETC_TBMR, val);
 }
+
+enum bdcr_cmd_class {
+	BDCR_CMD_UNSPEC = 0,
+	BDCR_CMD_MAC_FILTER,
+	BDCR_CMD_VLAN_FILTER,
+	BDCR_CMD_RSS,
+	BDCR_CMD_RFS,
+	BDCR_CMD_PORT_GCL,
+	BDCR_CMD_RECV_CLASSIFIER,
+	__BDCR_CMD_MAX_LEN,
+	BDCR_CMD_MAX_LEN = __BDCR_CMD_MAX_LEN - 1,
+};
+
+/* class 5, command 0 */
+struct tgs_gcl_conf {
+	u8	atc;	/* init gate value */
+	u8	res[7];
+	union {
+		struct {
+			u8	res1[4];
+			__le16	acl_len;
+			u8	res2[2];
+		};
+		struct {
+			u32 cctl;
+			u32 ccth;
+		};
+	};
+};
+
+#define ENETC_CBDR_SGL_IOMEN	BIT(0)
+#define ENETC_CBDR_SGL_IPVEN	BIT(3)
+#define ENETC_CBDR_SGL_GTST	BIT(4)
+#define ENETC_CBDR_SGL_IPV_MASK 0xe
+
+/* gate control list entry */
+struct gce {
+	u32	period;
+	u8	gate;
+	u8	res[3];
+};
+
+/* tgs_gcl_conf address point to this data space */
+struct tgs_gcl_data {
+	u32	btl;
+	u32	bth;
+	u32	ct;
+	u32	cte;
+};
+
+/* class 5, command 1 */
+struct tgs_gcl_query {
+		u8	res[12];
+		union {
+			struct {
+				__le16	acl_len; /* admin list length */
+				__le16	ocl_len; /* operation list length */
+			};
+			struct {
+				u16 admin_list_len;
+				u16 oper_list_len;
+			};
+		};
+};
+
+/* tgs_gcl_query command response data format */
+struct tgs_gcl_resp {
+	u32 abtl;	/* base time */
+	u32 abth;
+	u32 act;	/* cycle time */
+	u32 acte;	/* cycle time extend */
+	u32 cctl;	/* config change time */
+	u32 ccth;
+	u32 obtl;	/* operation base time */
+	u32 obth;
+	u32 oct;	/* operation cycle time */
+	u32 octe;	/* operation cycle time extend */
+	u32 ccel;	/* config change error */
+	u32 cceh;
+};
+
+struct enetc_cbd {
+	union{
+		struct {
+			__le32	addr[2];
+			union {
+				__le32	opt[4];
+				struct tgs_gcl_conf	gcl_conf;
+				struct tgs_gcl_query	gcl_query;
+			};
+		};	/* Long format */
+		__le32 data[6];
+	};
+	__le16 index;
+	__le16 length;
+	u8 cmd;
+	u8 cls;
+	u8 _res;
+	u8 status_flags;
+};
+
+#define ENETC_PTCFPR(n)		(0x1910 + (n) * 4) /* n = [0 ..7] */
+#define ENETC_FPE		BIT(31)
+
+/* Port capability register 0 */
+#define ENETC_PCAPR0_PSFPM	BIT(10)
+#define ENETC_PCAPR0_PSFP	BIT(9)
+#define ENETC_PCAPR0_TSN	BIT(4)
+#define ENETC_PCAPR0_QBU	BIT(3)
+
+/* port time gating control register */
+#define ENETC_QBV_PTGCR_OFFSET		0x11a00
+#define ENETC_QBV_TGE			0x80000000
+#define ENETC_QBV_TGPE			BIT(30)
+#define ENETC_QBV_TGDROP_DISABLE	BIT(29)
+
+/* Port time gating capability register */
+#define ENETC_QBV_PTGCAPR_OFFSET	0x11a08
+#define ENETC_QBV_MAX_GCL_LEN_MASK	0xffff
+
+/* Port time gating admin gate list status register */
+#define ENETC_QBV_PTGAGLSR_OFFSET	0x11a10
+#define ENETC_QBV_CFG_PEND_MASK	0x00000002
+
+#define ENETC_TGLSTR			0xa200
+#define ENETC_TGS_MIN_DIS_MASK		0x80000000
+#define ENETC_MIN_LOOKAHEAD_MASK	0xffff
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_qos.c b/drivers/net/ethernet/freescale/enetc/enetc_qos.c
new file mode 100644
index 000000000000..036bb39c7a0b
--- /dev/null
+++ b/drivers/net/ethernet/freescale/enetc/enetc_qos.c
@@ -0,0 +1,130 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
+/* Copyright 2019 NXP */
+
+#include "enetc.h"
+
+#include <net/pkt_sched.h>
+
+static u16 enetc_get_max_gcl_len(struct enetc_hw *hw)
+{
+	return enetc_rd(hw, ENETC_QBV_PTGCAPR_OFFSET)
+		& ENETC_QBV_MAX_GCL_LEN_MASK;
+}
+
+static int enetc_setup_taprio(struct net_device *ndev,
+			      struct tc_taprio_qopt_offload *admin_conf)
+{
+	struct enetc_ndev_priv *priv = netdev_priv(ndev);
+	struct enetc_cbd cbd = {.cmd = 0};
+	struct tgs_gcl_conf *gcl_config;
+	struct tgs_gcl_data *gcl_data;
+	struct gce *gce;
+	dma_addr_t dma;
+	u16 data_size;
+	u16 gcl_len;
+	u32 temp;
+	int i;
+
+	gcl_len = admin_conf->num_entries;
+	if (gcl_len > enetc_get_max_gcl_len(&priv->si->hw))
+		return -EINVAL;
+
+	if (admin_conf->enable) {
+		enetc_wr(&priv->si->hw,
+			 ENETC_QBV_PTGCR_OFFSET,
+			 temp & (~ENETC_QBV_TGE));
+		usleep_range(10, 20);
+		enetc_wr(&priv->si->hw,
+			 ENETC_QBV_PTGCR_OFFSET,
+			 temp | ENETC_QBV_TGE);
+	} else {
+		enetc_wr(&priv->si->hw,
+			 ENETC_QBV_PTGCR_OFFSET,
+			 temp & (~ENETC_QBV_TGE));
+		return 0;
+	}
+
+	/* Configure the (administrative) gate control list using the
+	 * control BD descriptor.
+	 */
+	gcl_config = &cbd.gcl_conf;
+
+	data_size = sizeof(struct tgs_gcl_data) + gcl_len * sizeof(struct gce);
+
+	gcl_data = kzalloc(data_size, __GFP_DMA | GFP_KERNEL);
+	if (!gcl_data)
+		return -ENOMEM;
+
+	gce = (struct gce *)(gcl_data + 1);
+
+	/* Since no initial state config in taprio, set gates open as default.
+	 */
+	gcl_config->atc = 0xff;
+	gcl_config->acl_len = cpu_to_le16(gcl_len);
+
+	if (!admin_conf->base_time) {
+		gcl_data->btl =
+			cpu_to_le32(enetc_rd(&priv->si->hw, ENETC_SICTR0));
+		gcl_data->bth =
+			cpu_to_le32(enetc_rd(&priv->si->hw, ENETC_SICTR1));
+	} else {
+		gcl_data->btl =
+			cpu_to_le32(lower_32_bits(admin_conf->base_time));
+		gcl_data->bth =
+			cpu_to_le32(upper_32_bits(admin_conf->base_time));
+	}
+
+	gcl_data->ct = cpu_to_le32(admin_conf->cycle_time);
+	gcl_data->cte = cpu_to_le32(admin_conf->cycle_time_extension);
+
+	for (i = 0; i < gcl_len; i++) {
+		struct tc_taprio_sched_entry *temp_entry;
+		struct gce *temp_gce = gce + i;
+
+		temp_entry = &admin_conf->entries[i];
+
+		temp_gce->gate = cpu_to_le32(temp_entry->gate_mask);
+		temp_gce->period = cpu_to_le32(temp_entry->interval);
+	}
+
+	cbd.length = cpu_to_le16(data_size);
+	cbd.status_flags = 0;
+
+	dma = dma_map_single(&priv->si->pdev->dev, gcl_data,
+			     data_size, DMA_TO_DEVICE);
+	if (dma_mapping_error(&priv->si->pdev->dev, dma)) {
+		netdev_err(priv->si->ndev, "DMA mapping failed!\n");
+		kfree(gcl_data);
+		return -ENOMEM;
+	}
+
+	cbd.addr[0] = lower_32_bits(dma);
+	cbd.addr[1] = upper_32_bits(dma);
+	cbd.cls = BDCR_CMD_PORT_GCL;
+
+	/* Updated by ENETC on completion of the configuration
+	 * command. A zero value indicates success.
+	 */
+	cbd.status_flags = 0;
+
+	enetc_send_cmd(priv->si, &cbd);
+
+	dma_unmap_single(&priv->si->pdev->dev, dma, data_size, DMA_TO_DEVICE);
+	kfree(gcl_data);
+
+	return 0;
+}
+
+int enetc_setup_tc_taprio(struct net_device *ndev, void *type_data)
+{
+	struct tc_taprio_qopt_offload *taprio = type_data;
+	struct enetc_ndev_priv *priv = netdev_priv(ndev);
+	int i;
+
+	for (i = 0; i < priv->num_tx_rings; i++)
+		enetc_set_bdr_prio(&priv->si->hw,
+				   priv->tx_ring[i]->index,
+				   taprio->enable ? i : 0);
+
+	return enetc_setup_taprio(ndev, taprio);
+}
-- 
2.17.1