Merge branch 'stmmac-ETF-support'

Jose Abreu says:

====================
net: stmmac: ETF support

This series adds the support for ETF scheduler in stmmac.

1) Starts adding the support by implementing Enhanced Descriptors in stmmac
main core. This is needed for ETF feature in XGMAC and QoS cores.

2) Integrates the ETF logic into stmmac TC core.

3) and 4) adds the HW specific support for ETF in XGMAC and QoS cores. The
IP feature is called TBS (Time Based Scheduling).

5) Enables ETF in GMAC5 IPK PCI entry for all Queues except Queue 0.

6) Adds the new TBS feature and even more information into the debugFS
HW features file.
====================
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/stmicro/stmmac/common.h

@@ -368,6 +368,7 @@ struct dma_features {
 	unsigned int estdep;
 	unsigned int estsel;
 	unsigned int fpesel;
+	unsigned int tbssel;
 };
 
 /* RX Buffer size must be multiple of 4/8/16 bytes */

drivers/net/ethernet/stmicro/stmmac/descs.h

@@ -171,6 +171,15 @@ struct dma_extended_desc {
 	__le32 des7;	/* Tx/Rx Timestamp High */
 };
 
+/* Enhanced descriptor for TBS */
+struct dma_edesc {
+	__le32 des4;
+	__le32 des5;
+	__le32 des6;
+	__le32 des7;
+	struct dma_desc basic;
+};
+
 /* Transmit checksum insertion control */
 #define	TX_CIC_FULL	3	/* Include IP header and pseudoheader */
 

drivers/net/ethernet/stmicro/stmmac/dwmac4.h

@@ -239,6 +239,7 @@ enum power_event {
 
 /* MAC HW features3 bitmap */
 #define GMAC_HW_FEAT_ASP		GENMASK(29, 28)
+#define GMAC_HW_FEAT_TBSSEL		BIT(27)
 #define GMAC_HW_FEAT_FPESEL		BIT(26)
 #define GMAC_HW_FEAT_ESTWID		GENMASK(21, 20)
 #define GMAC_HW_FEAT_ESTDEP		GENMASK(19, 17)

drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c

@@ -10,6 +10,7 @@
 
 #include <linux/stmmac.h>
 #include "common.h"
+#include "dwmac4.h"
 #include "dwmac4_descs.h"
 
 static int dwmac4_wrback_get_tx_status(void *data, struct stmmac_extra_stats *x,
@@ -505,6 +506,14 @@ static void dwmac4_set_sec_addr(struct dma_desc *p, dma_addr_t addr)
 	p->des3 = cpu_to_le32(upper_32_bits(addr) | RDES3_BUFFER2_VALID_ADDR);
 }
 
+static void dwmac4_set_tbs(struct dma_edesc *p, u32 sec, u32 nsec)
+{
+	p->des4 = cpu_to_le32((sec & TDES4_LT) | TDES4_LTV);
+	p->des5 = cpu_to_le32(nsec & TDES5_LT);
+	p->des6 = 0;
+	p->des7 = 0;
+}
+
 const struct stmmac_desc_ops dwmac4_desc_ops = {
 	.tx_status = dwmac4_wrback_get_tx_status,
 	.rx_status = dwmac4_wrback_get_rx_status,
@@ -534,6 +543,7 @@ const struct stmmac_desc_ops dwmac4_desc_ops = {
 	.set_vlan = dwmac4_set_vlan,
 	.get_rx_header_len = dwmac4_get_rx_header_len,
 	.set_sec_addr = dwmac4_set_sec_addr,
+	.set_tbs = dwmac4_set_tbs,
 };
 
 const struct stmmac_mode_ops dwmac4_ring_mode_ops = {

drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.h

@@ -73,6 +73,13 @@
 #define TDES3_CONTEXT_TYPE		BIT(30)
 #define	TDES3_CONTEXT_TYPE_SHIFT	30
 
+/* TDES4 */
+#define TDES4_LTV			BIT(31)
+#define TDES4_LT			GENMASK(7, 0)
+
+/* TDES5 */
+#define TDES5_LT			GENMASK(31, 8)
+
 /* TDS3 use for both format (read and write back) */
 #define TDES3_OWN			BIT(31)
 #define TDES3_OWN_SHIFT			31

drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c

@@ -404,6 +404,7 @@ static void dwmac4_get_hw_feature(void __iomem *ioaddr,
 
 	/* 5.10 Features */
 	dma_cap->asp = (hw_cap & GMAC_HW_FEAT_ASP) >> 28;
+	dma_cap->tbssel = (hw_cap & GMAC_HW_FEAT_TBSSEL) >> 27;
 	dma_cap->fpesel = (hw_cap & GMAC_HW_FEAT_FPESEL) >> 26;
 	dma_cap->estwid = (hw_cap & GMAC_HW_FEAT_ESTWID) >> 20;
 	dma_cap->estdep = (hw_cap & GMAC_HW_FEAT_ESTDEP) >> 17;
@@ -471,6 +472,25 @@ static void dwmac4_enable_sph(void __iomem *ioaddr, bool en, u32 chan)
 	writel(value, ioaddr + DMA_CHAN_CONTROL(chan));
 }
 
+static int dwmac4_enable_tbs(void __iomem *ioaddr, bool en, u32 chan)
+{
+	u32 value = readl(ioaddr + DMA_CHAN_TX_CONTROL(chan));
+
+	if (en)
+		value |= DMA_CONTROL_EDSE;
+	else
+		value &= ~DMA_CONTROL_EDSE;
+
+	writel(value, ioaddr + DMA_CHAN_TX_CONTROL(chan));
+
+	value = readl(ioaddr + DMA_CHAN_TX_CONTROL(chan)) & DMA_CONTROL_EDSE;
+	if (en && !value)
+		return -EIO;
+
+	writel(DMA_TBS_DEF_FTOS, ioaddr + DMA_TBS_CTRL);
+	return 0;
+}
+
 const struct stmmac_dma_ops dwmac4_dma_ops = {
 	.reset = dwmac4_dma_reset,
 	.init = dwmac4_dma_init,
@@ -527,4 +547,5 @@ const struct stmmac_dma_ops dwmac410_dma_ops = {
 	.qmode = dwmac4_qmode,
 	.set_bfsize = dwmac4_set_bfsize,
 	.enable_sph = dwmac4_enable_sph,
+	.enable_tbs = dwmac4_enable_tbs,
 };

drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.h

@@ -22,6 +22,7 @@
 #define DMA_DEBUG_STATUS_1		0x00001010
 #define DMA_DEBUG_STATUS_2		0x00001014
 #define DMA_AXI_BUS_MODE		0x00001028
+#define DMA_TBS_CTRL			0x00001050
 
 /* DMA Bus Mode bitmap */
 #define DMA_BUS_MODE_SFT_RESET		BIT(0)
@@ -82,6 +83,11 @@
 
 #define DMA_AXI_BURST_LEN_MASK		0x000000FE
 
+/* DMA TBS Control */
+#define DMA_TBS_FTOS			GENMASK(31, 8)
+#define DMA_TBS_FTOV			BIT(0)
+#define DMA_TBS_DEF_FTOS		(DMA_TBS_FTOS | DMA_TBS_FTOV)
+
 /* Following DMA defines are chanels oriented */
 #define DMA_CHAN_BASE_ADDR		0x00001100
 #define DMA_CHAN_BASE_OFFSET		0x80
@@ -114,6 +120,7 @@
 #define DMA_CONTROL_MSS_MASK		GENMASK(13, 0)
 
 /* DMA Tx Channel X Control register defines */
+#define DMA_CONTROL_EDSE		BIT(28)
 #define DMA_CONTROL_TSE			BIT(12)
 #define DMA_CONTROL_OSP			BIT(4)
 #define DMA_CONTROL_ST			BIT(0)

drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h

@@ -139,6 +139,7 @@
 #define XGMAC_HWFEAT_TXQCNT		GENMASK(9, 6)
 #define XGMAC_HWFEAT_RXQCNT		GENMASK(3, 0)
 #define XGMAC_HW_FEATURE3		0x00000128
+#define XGMAC_HWFEAT_TBSSEL		BIT(27)
 #define XGMAC_HWFEAT_FPESEL		BIT(26)
 #define XGMAC_HWFEAT_ESTWID		GENMASK(24, 23)
 #define XGMAC_HWFEAT_ESTDEP		GENMASK(22, 20)
@@ -346,6 +347,13 @@
 #define XGMAC_TDPS			GENMASK(29, 0)
 #define XGMAC_RX_EDMA_CTRL		0x00003044
 #define XGMAC_RDPS			GENMASK(29, 0)
+#define XGMAC_DMA_TBS_CTRL0		0x00003054
+#define XGMAC_DMA_TBS_CTRL1		0x00003058
+#define XGMAC_DMA_TBS_CTRL2		0x0000305c
+#define XGMAC_DMA_TBS_CTRL3		0x00003060
+#define XGMAC_FTOS			GENMASK(31, 8)
+#define XGMAC_FTOV			BIT(0)
+#define XGMAC_DEF_FTOS			(XGMAC_FTOS | XGMAC_FTOV)
 #define XGMAC_DMA_SAFETY_INT_STATUS	0x00003064
 #define XGMAC_MCSIS			BIT(31)
 #define XGMAC_MSUIS			BIT(29)
@@ -360,6 +368,7 @@
 #define XGMAC_SPH			BIT(24)
 #define XGMAC_PBLx8			BIT(16)
 #define XGMAC_DMA_CH_TX_CONTROL(x)	(0x00003104 + (0x80 * (x)))
+#define XGMAC_EDSE			BIT(28)
 #define XGMAC_TxPBL			GENMASK(21, 16)
 #define XGMAC_TxPBL_SHIFT		16
 #define XGMAC_TSE			BIT(12)
@@ -404,6 +413,9 @@
 #define XGMAC_REGSIZE			((0x0000317c + (0x80 * 15)) / 4)
 
 /* Descriptors */
+#define XGMAC_TDES0_LTV			BIT(31)
+#define XGMAC_TDES0_LT			GENMASK(7, 0)
+#define XGMAC_TDES1_LT			GENMASK(31, 8)
 #define XGMAC_TDES2_IVT			GENMASK(31, 16)
 #define XGMAC_TDES2_IVT_SHIFT		16
 #define XGMAC_TDES2_IOC			BIT(31)
@@ -422,6 +434,7 @@
 #define XGMAC_TDES3_TCMSSV		BIT(26)
 #define XGMAC_TDES3_SAIC		GENMASK(25, 23)
 #define XGMAC_TDES3_SAIC_SHIFT		23
+#define XGMAC_TDES3_TBSV		BIT(24)
 #define XGMAC_TDES3_THL			GENMASK(22, 19)
 #define XGMAC_TDES3_THL_SHIFT		19
 #define XGMAC_TDES3_IVTIR		GENMASK(19, 18)

drivers/net/ethernet/stmicro/stmmac/dwxgmac2_descs.c

@@ -339,6 +339,14 @@ static void dwxgmac2_set_vlan(struct dma_desc *p, u32 type)
 	p->des2 |= cpu_to_le32(type & XGMAC_TDES2_VTIR);
 }
 
+static void dwxgmac2_set_tbs(struct dma_edesc *p, u32 sec, u32 nsec)
+{
+	p->des4 = cpu_to_le32((sec & XGMAC_TDES0_LT) | XGMAC_TDES0_LTV);
+	p->des5 = cpu_to_le32(nsec & XGMAC_TDES1_LT);
+	p->des6 = 0;
+	p->des7 = 0;
+}
+
 const struct stmmac_desc_ops dwxgmac210_desc_ops = {
 	.tx_status = dwxgmac2_get_tx_status,
 	.rx_status = dwxgmac2_get_rx_status,
@@ -368,4 +376,5 @@ const struct stmmac_desc_ops dwxgmac210_desc_ops = {
 	.set_sarc = dwxgmac2_set_sarc,
 	.set_vlan_tag = dwxgmac2_set_vlan_tag,
 	.set_vlan = dwxgmac2_set_vlan,
+	.set_tbs = dwxgmac2_set_tbs,
 };

drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c

@@ -429,6 +429,7 @@ static void dwxgmac2_get_hw_feature(void __iomem *ioaddr,
 
 	/* MAC HW feature 3 */
 	hw_cap = readl(ioaddr + XGMAC_HW_FEATURE3);
+	dma_cap->tbssel = (hw_cap & XGMAC_HWFEAT_TBSSEL) >> 27;
 	dma_cap->fpesel = (hw_cap & XGMAC_HWFEAT_FPESEL) >> 26;
 	dma_cap->estwid = (hw_cap & XGMAC_HWFEAT_ESTWID) >> 23;
 	dma_cap->estdep = (hw_cap & XGMAC_HWFEAT_ESTDEP) >> 20;
@@ -523,6 +524,28 @@ static void dwxgmac2_enable_sph(void __iomem *ioaddr, bool en, u32 chan)
 	writel(value, ioaddr + XGMAC_DMA_CH_CONTROL(chan));
 }
 
+static int dwxgmac2_enable_tbs(void __iomem *ioaddr, bool en, u32 chan)
+{
+	u32 value = readl(ioaddr + XGMAC_DMA_CH_TX_CONTROL(chan));
+
+	if (en)
+		value |= XGMAC_EDSE;
+	else
+		value &= ~XGMAC_EDSE;
+
+	writel(value, ioaddr + XGMAC_DMA_CH_TX_CONTROL(chan));
+
+	value = readl(ioaddr + XGMAC_DMA_CH_TX_CONTROL(chan)) & XGMAC_EDSE;
+	if (en && !value)
+		return -EIO;
+
+	writel(XGMAC_DEF_FTOS, ioaddr + XGMAC_DMA_TBS_CTRL0);
+	writel(XGMAC_DEF_FTOS, ioaddr + XGMAC_DMA_TBS_CTRL1);
+	writel(XGMAC_DEF_FTOS, ioaddr + XGMAC_DMA_TBS_CTRL2);
+	writel(XGMAC_DEF_FTOS, ioaddr + XGMAC_DMA_TBS_CTRL3);
+	return 0;
+}
+
 const struct stmmac_dma_ops dwxgmac210_dma_ops = {
 	.reset = dwxgmac2_dma_reset,
 	.init = dwxgmac2_dma_init,
@@ -550,4 +573,5 @@ const struct stmmac_dma_ops dwxgmac210_dma_ops = {
 	.qmode = dwxgmac2_qmode,
 	.set_bfsize = dwxgmac2_set_bfsize,
 	.enable_sph = dwxgmac2_enable_sph,
+	.enable_tbs = dwxgmac2_enable_tbs,
 };

drivers/net/ethernet/stmicro/stmmac/hwif.h

@@ -29,6 +29,7 @@ struct stmmac_extra_stats;
 struct stmmac_safety_stats;
 struct dma_desc;
 struct dma_extended_desc;
+struct dma_edesc;
 
 /* Descriptors helpers */
 struct stmmac_desc_ops {
@@ -95,6 +96,7 @@ struct stmmac_desc_ops {
 	void (*set_vlan_tag)(struct dma_desc *p, u16 tag, u16 inner_tag,
 			     u32 inner_type);
 	void (*set_vlan)(struct dma_desc *p, u32 type);
+	void (*set_tbs)(struct dma_edesc *p, u32 sec, u32 nsec);
 };
 
 #define stmmac_init_rx_desc(__priv, __args...) \
@@ -157,6 +159,8 @@ struct stmmac_desc_ops {
 	stmmac_do_void_callback(__priv, desc, set_vlan_tag, __args)
 #define stmmac_set_desc_vlan(__priv, __args...) \
 	stmmac_do_void_callback(__priv, desc, set_vlan, __args)
+#define stmmac_set_desc_tbs(__priv, __args...) \
+	stmmac_do_void_callback(__priv, desc, set_tbs, __args)
 
 struct stmmac_dma_cfg;
 struct dma_features;
@@ -210,6 +214,7 @@ struct stmmac_dma_ops {
 	void (*qmode)(void __iomem *ioaddr, u32 channel, u8 qmode);
 	void (*set_bfsize)(void __iomem *ioaddr, int bfsize, u32 chan);
 	void (*enable_sph)(void __iomem *ioaddr, bool en, u32 chan);
+	int (*enable_tbs)(void __iomem *ioaddr, bool en, u32 chan);
 };
 
 #define stmmac_reset(__priv, __args...) \
@@ -268,6 +273,8 @@ struct stmmac_dma_ops {
 	stmmac_do_void_callback(__priv, dma, set_bfsize, __args)
 #define stmmac_enable_sph(__priv, __args...) \
 	stmmac_do_void_callback(__priv, dma, enable_sph, __args)
+#define stmmac_enable_tbs(__priv, __args...) \
+	stmmac_do_callback(__priv, dma, enable_tbs, __args)
 
 struct mac_device_info;
 struct net_device;
@@ -526,6 +533,7 @@ struct tc_cls_u32_offload;
 struct tc_cbs_qopt_offload;
 struct flow_cls_offload;
 struct tc_taprio_qopt_offload;
+struct tc_etf_qopt_offload;
 
 struct stmmac_tc_ops {
 	int (*init)(struct stmmac_priv *priv);
@@ -537,6 +545,8 @@ struct stmmac_tc_ops {
 			 struct flow_cls_offload *cls);
 	int (*setup_taprio)(struct stmmac_priv *priv,
 			    struct tc_taprio_qopt_offload *qopt);
+	int (*setup_etf)(struct stmmac_priv *priv,
+			 struct tc_etf_qopt_offload *qopt);
 };
 
 #define stmmac_tc_init(__priv, __args...) \
@@ -549,6 +559,8 @@ struct stmmac_tc_ops {
 	stmmac_do_callback(__priv, tc, setup_cls, __args)
 #define stmmac_tc_setup_taprio(__priv, __args...) \
 	stmmac_do_callback(__priv, tc, setup_taprio, __args)
+#define stmmac_tc_setup_etf(__priv, __args...) \
+	stmmac_do_callback(__priv, tc, setup_etf, __args)
 
 struct stmmac_counters;
 

drivers/net/ethernet/stmicro/stmmac/stmmac.h

@@ -39,13 +39,18 @@ struct stmmac_tx_info {
 	bool is_jumbo;
 };
 
+#define STMMAC_TBS_AVAIL	BIT(0)
+#define STMMAC_TBS_EN		BIT(1)
+
 /* Frequently used values are kept adjacent for cache effect */
 struct stmmac_tx_queue {
 	u32 tx_count_frames;
+	int tbs;
 	struct timer_list txtimer;
 	u32 queue_index;
 	struct stmmac_priv *priv_data;
 	struct dma_extended_desc *dma_etx ____cacheline_aligned_in_smp;
+	struct dma_edesc *dma_entx;
 	struct dma_desc *dma_tx;
 	struct sk_buff **tx_skbuff;
 	struct stmmac_tx_info *tx_skbuff_dma;

drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c

@@ -401,6 +401,8 @@ static int snps_gmac5_default_data(struct pci_dev *pdev,
 		plat->tx_queues_cfg[i].use_prio = false;
 		plat->tx_queues_cfg[i].mode_to_use = MTL_QUEUE_DCB;
 		plat->tx_queues_cfg[i].weight = 25;
+		if (i > 0)
+			plat->tx_queues_cfg[i].tbs_en = 1;
 	}
 
 	plat->rx_sched_algorithm = MTL_RX_ALGORITHM_SP;

drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c

@@ -14,6 +14,7 @@
 #include <linux/phy.h>
 #include <linux/udp.h>
 #include <net/pkt_cls.h>
+#include <net/pkt_sched.h>
 #include <net/tcp.h>
 #include <net/udp.h>
 #include <net/tc_act/tc_gact.h>
@@ -50,6 +51,7 @@ struct stmmac_packet_attrs {
 	u8 id;
 	int sarc;
 	u16 queue_mapping;
+	u64 timestamp;
 };
 
 static u8 stmmac_test_next_id;
@@ -208,6 +210,9 @@ static struct sk_buff *stmmac_test_get_udp_skb(struct stmmac_priv *priv,
 	skb->pkt_type = PACKET_HOST;
 	skb->dev = priv->dev;
 
+	if (attr->timestamp)
+		skb->tstamp = ns_to_ktime(attr->timestamp);
+
 	return skb;
 }
 
@@ -339,8 +344,7 @@ static int __stmmac_test_loopback(struct stmmac_priv *priv,
 		goto cleanup;
 	}
 
-	skb_set_queue_mapping(skb, attr->queue_mapping);
-	ret = dev_queue_xmit(skb);
+	ret = dev_direct_xmit(skb, attr->queue_mapping);
 	if (ret)
 		goto cleanup;
 
@@ -926,8 +930,7 @@ static int __stmmac_test_vlanfilt(struct stmmac_priv *priv)
 			goto vlan_del;
 		}
 
-		skb_set_queue_mapping(skb, 0);
-		ret = dev_queue_xmit(skb);
+		ret = dev_direct_xmit(skb, 0);
 		if (ret)
 			goto vlan_del;
 
@@ -1018,8 +1021,7 @@ static int __stmmac_test_dvlanfilt(struct stmmac_priv *priv)
 			goto vlan_del;
 		}
 
-		skb_set_queue_mapping(skb, 0);
-		ret = dev_queue_xmit(skb);
+		ret = dev_direct_xmit(skb, 0);
 		if (ret)
 			goto vlan_del;
 
@@ -1286,8 +1288,7 @@ static int stmmac_test_vlanoff_common(struct stmmac_priv *priv, bool svlan)
 	__vlan_hwaccel_put_tag(skb, htons(proto), tpriv->vlan_id);
 	skb->protocol = htons(proto);
 
-	skb_set_queue_mapping(skb, 0);
-	ret = dev_queue_xmit(skb);
+	ret = dev_direct_xmit(skb, 0);
 	if (ret)
 		goto vlan_del;
 
@@ -1639,8 +1640,7 @@ static int stmmac_test_arpoffload(struct stmmac_priv *priv)
 	if (ret)
 		goto cleanup;
 
-	skb_set_queue_mapping(skb, 0);
-	ret = dev_queue_xmit(skb);
+	ret = dev_direct_xmit(skb, 0);
 	if (ret)
 		goto cleanup_promisc;
 
@@ -1728,6 +1728,68 @@ static int stmmac_test_sph(struct stmmac_priv *priv)
 	return 0;
 }
 
+static int stmmac_test_tbs(struct stmmac_priv *priv)
+{
+#define STMMAC_TBS_LT_OFFSET		(500 * 1000 * 1000) /* 500 ms*/
+	struct stmmac_packet_attrs attr = { };
+	struct tc_etf_qopt_offload qopt;
+	u64 start_time, curr_time = 0;
+	unsigned long flags;
+	int ret, i;
+
+	if (!priv->hwts_tx_en)
+		return -EOPNOTSUPP;
+
+	/* Find first TBS enabled Queue, if any */
+	for (i = 0; i < priv->plat->tx_queues_to_use; i++)
+		if (priv->tx_queue[i].tbs & STMMAC_TBS_AVAIL)
+			break;
+
+	if (i >= priv->plat->tx_queues_to_use)
+		return -EOPNOTSUPP;
+
+	qopt.enable = true;
+	qopt.queue = i;
+
+	ret = stmmac_tc_setup_etf(priv, priv, &qopt);
+	if (ret)
+		return ret;
+
+	spin_lock_irqsave(&priv->ptp_lock, flags);
+	stmmac_get_systime(priv, priv->ptpaddr, &curr_time);
+	spin_unlock_irqrestore(&priv->ptp_lock, flags);
+
+	if (!curr_time) {
+		ret = -EOPNOTSUPP;
+		goto fail_disable;
+	}
+
+	start_time = curr_time;
+	curr_time += STMMAC_TBS_LT_OFFSET;
+
+	attr.dst = priv->dev->dev_addr;
+	attr.timestamp = curr_time;
+	attr.timeout = nsecs_to_jiffies(2 * STMMAC_TBS_LT_OFFSET);
+	attr.queue_mapping = i;
+
+	ret = __stmmac_test_loopback(priv, &attr);
+	if (ret)
+		goto fail_disable;
+
+	/* Check if expected time has elapsed */
+	spin_lock_irqsave(&priv->ptp_lock, flags);
+	stmmac_get_systime(priv, priv->ptpaddr, &curr_time);
+	spin_unlock_irqrestore(&priv->ptp_lock, flags);
+
+	if ((curr_time - start_time) < STMMAC_TBS_LT_OFFSET)
+		ret = -EINVAL;
+
+fail_disable:
+	qopt.enable = false;
+	stmmac_tc_setup_etf(priv, priv, &qopt);
+	return ret;
+}
+
 #define STMMAC_LOOPBACK_NONE	0
 #define STMMAC_LOOPBACK_MAC	1
 #define STMMAC_LOOPBACK_PHY	2
@@ -1861,6 +1923,10 @@ static const struct stmmac_test {
 		.name = "Split Header               ",
 		.lb = STMMAC_LOOPBACK_PHY,
 		.fn = stmmac_test_sph,
+	}, {
+		.name = "TBS (ETF Scheduler)        ",
+		.lb = STMMAC_LOOPBACK_PHY,
+		.fn = stmmac_test_tbs,
 	},
 };
 
@@ -1869,7 +1935,6 @@ void stmmac_selftest_run(struct net_device *dev,
 {
 	struct stmmac_priv *priv = netdev_priv(dev);
 	int count = stmmac_selftest_get_count(priv);
-	int carrier = netif_carrier_ok(dev);
 	int i, ret;
 
 	memset(buf, 0, sizeof(*buf) * count);
@@ -1879,15 +1944,12 @@ void stmmac_selftest_run(struct net_device *dev,
 		netdev_err(priv->dev, "Only offline tests are supported\n");
 		etest->flags |= ETH_TEST_FL_FAILED;
 		return;
-	} else if (!carrier) {
+	} else if (!netif_carrier_ok(dev)) {
 		netdev_err(priv->dev, "You need valid Link to execute tests\n");
 		etest->flags |= ETH_TEST_FL_FAILED;
 		return;
 	}
 
-	/* We don't want extra traffic */
-	netif_carrier_off(dev);
-
 	/* Wait for queues drain */
 	msleep(200);
 
@@ -1942,10 +2004,6 @@ void stmmac_selftest_run(struct net_device *dev,
 			break;
 		}
 	}
-
-	/* Restart everything */
-	if (carrier)
-		netif_carrier_on(dev);
 }
 
 void stmmac_selftest_get_strings(struct stmmac_priv *priv, u8 *data)

drivers/net/ethernet/stmicro/stmmac/stmmac_tc.c

@@ -727,10 +727,31 @@ static int tc_setup_taprio(struct stmmac_priv *priv,
 	return ret;
 }
 
+static int tc_setup_etf(struct stmmac_priv *priv,
+			struct tc_etf_qopt_offload *qopt)
+{
+	if (!priv->dma_cap.tbssel)
+		return -EOPNOTSUPP;
+	if (qopt->queue >= priv->plat->tx_queues_to_use)
+		return -EINVAL;
+	if (!(priv->tx_queue[qopt->queue].tbs & STMMAC_TBS_AVAIL))
+		return -EINVAL;
+
+	if (qopt->enable)
+		priv->tx_queue[qopt->queue].tbs |= STMMAC_TBS_EN;
+	else
+		priv->tx_queue[qopt->queue].tbs &= ~STMMAC_TBS_EN;
+
+	netdev_info(priv->dev, "%s ETF for Queue %d\n",
+		    qopt->enable ? "enabled" : "disabled", qopt->queue);
+	return 0;
+}
+
 const struct stmmac_tc_ops dwmac510_tc_ops = {
 	.init = tc_init,
 	.setup_cls_u32 = tc_setup_cls_u32,
 	.setup_cbs = tc_setup_cbs,
 	.setup_cls = tc_setup_cls,
 	.setup_taprio = tc_setup_taprio,
+	.setup_etf = tc_setup_etf,
 };

include/linux/stmmac.h

@@ -139,6 +139,7 @@ struct stmmac_txq_cfg {
 	u32 low_credit;
 	bool use_prio;
 	u32 prio;
+	int tbs_en;
 };
 
 struct plat_stmmacenet_data {