[PATCH net-next 00/10] net: stmmac: Be less dependent on Synopsys ID

[PATCH net-next 00/10] net: stmmac: Be less dependent on Synopsys ID

[Jose Abreu]

David,

This series was based on top of [1]. Please see my reply on [1] and let me
know if I need to rebase against -next without this dependecy.

All,

This targets to uniformize the handling of the different GMAC versions in
stmmac_main.c file.

Currently there are some if/else conditions in the main source file which
calls different callbacks depending on the ID of GMAC.

With the introducion of a generic HW interface handling which automatically
selects the GMAC callbacks to be used, it is now unpleasant to see if
conditions in the main code because this should be completely agnostic of the
GMAC version.

This series removes most of these conditions. There are some if conditions
that remain untouched but the callbacks handling are now uniformized.

Tested in GMAC5, hope I didn't break any previous versions.

[1] https://patchwork.ozlabs.org/patch/908618/

Cc: David S. Miller <davem@davemloft.net>
Cc: Joao Pinto <jpinto@synopsys.com>
Cc: Vitor Soares <soares@synopsys.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>

Jose Abreu (10):
  net: stmmac: Let descriptor code set skbuff address
  net: stmmac: Let descriptor code clear the descriptor
  net: stmmac: Uniformize the use of dma_{rx/tx}_mode callbacks
  net: stmmac: Remove uneeded checks for GMAC version
  net: stmmac: Move PTP and MMC base address calculation to hwif.c
  net: stmmac: Uniformize the use of dma_init_* callbacks
  net: stmmac: Remove uneeded check for GMAC version in stmmac_xmit
  net: stmmac: Do not initialize the RX Descriptor twice
  net: stmmac: Let descriptor code get skbuff address
  net: stmmac: Remove if condition by taking advantage of hwif return
    code

 drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c  |   57 ++++---
 .../net/ethernet/stmicro/stmmac/dwmac1000_dma.c    |   92 ++++++----
 drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c |   35 +++--
 drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c |   22 +++
 drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c   |    3 +-
 drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.h   |    1 -
 drivers/net/ethernet/stmicro/stmmac/enh_desc.c     |   18 ++
 drivers/net/ethernet/stmicro/stmmac/hwif.c         |   34 ++++
 drivers/net/ethernet/stmicro/stmmac/hwif.h         |   25 ++-
 drivers/net/ethernet/stmicro/stmmac/norm_desc.c    |   18 ++
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  |  193 +++++++-------------
 11 files changed, 286 insertions(+), 212 deletions(-)

[PATCH net-next 01/10] net: stmmac: Let descriptor code set skbuff address

[Jose Abreu]

Stop using if conditions depending on the GMAC version for setting the
the descriptor skbuff address and use instead a helper implemented in
the descriptor files.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Joao Pinto <jpinto@synopsys.com>
Cc: Vitor Soares <soares@synopsys.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c |    7 +++++
 drivers/net/ethernet/stmicro/stmmac/enh_desc.c     |    6 ++++
 drivers/net/ethernet/stmicro/stmmac/hwif.h         |    4 +++
 drivers/net/ethernet/stmicro/stmmac/norm_desc.c    |    6 ++++
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  |   25 ++++---------------
 5 files changed, 29 insertions(+), 19 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
index 65ed896..f67caa1 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
@@ -424,6 +424,12 @@ static void dwmac4_set_mss_ctxt(struct dma_desc *p, unsigned int mss)
 	p->des3 = cpu_to_le32(TDES3_CONTEXT_TYPE | TDES3_CTXT_TCMSSV);
 }
 
+static void dwmac4_set_addr(struct dma_desc *p, dma_addr_t addr)
+{
+	p->des0 = cpu_to_le32(addr);
+	p->des1 = 0;
+}
+
 const struct stmmac_desc_ops dwmac4_desc_ops = {
 	.tx_status = dwmac4_wrback_get_tx_status,
 	.rx_status = dwmac4_wrback_get_rx_status,
@@ -445,6 +451,7 @@ static void dwmac4_set_mss_ctxt(struct dma_desc *p, unsigned int mss)
 	.init_tx_desc = dwmac4_rd_init_tx_desc,
 	.display_ring = dwmac4_display_ring,
 	.set_mss = dwmac4_set_mss_ctxt,
+	.set_addr = dwmac4_set_addr,
 };
 
 const struct stmmac_mode_ops dwmac4_ring_mode_ops = { };
diff --git a/drivers/net/ethernet/stmicro/stmmac/enh_desc.c b/drivers/net/ethernet/stmicro/stmmac/enh_desc.c
index 3bfb3f5..02749e4 100644
--- a/drivers/net/ethernet/stmicro/stmmac/enh_desc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/enh_desc.c
@@ -437,6 +437,11 @@ static void enh_desc_display_ring(void *head, unsigned int size, bool rx)
 	pr_info("\n");
 }
 
+static void enh_desc_set_addr(struct dma_desc *p, dma_addr_t addr)
+{
+	p->des2 = cpu_to_le32(addr);
+}
+
 const struct stmmac_desc_ops enh_desc_ops = {
 	.tx_status = enh_desc_get_tx_status,
 	.rx_status = enh_desc_get_rx_status,
@@ -457,4 +462,5 @@ static void enh_desc_display_ring(void *head, unsigned int size, bool rx)
 	.get_timestamp = enh_desc_get_timestamp,
 	.get_rx_timestamp_status = enh_desc_get_rx_timestamp_status,
 	.display_ring = enh_desc_display_ring,
+	.set_addr = enh_desc_set_addr,
 };
diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.h b/drivers/net/ethernet/stmicro/stmmac/hwif.h
index b7539a1..d66d194 100644
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.h
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h
@@ -79,6 +79,8 @@ struct stmmac_desc_ops {
 	void (*display_ring)(void *head, unsigned int size, bool rx);
 	/* set MSS via context descriptor */
 	void (*set_mss)(struct dma_desc *p, unsigned int mss);
+	/* set descriptor skbuff address */
+	void (*set_addr)(struct dma_desc *p, dma_addr_t addr);
 };
 
 #define stmmac_init_rx_desc(__priv, __args...) \
@@ -123,6 +125,8 @@ struct stmmac_desc_ops {
 	stmmac_do_void_callback(__priv, desc, display_ring, __args)
 #define stmmac_set_mss(__priv, __args...) \
 	stmmac_do_void_callback(__priv, desc, set_mss, __args)
+#define stmmac_set_desc_addr(__priv, __args...) \
+	stmmac_do_void_callback(__priv, desc, set_addr, __args)
 
 struct stmmac_dma_cfg;
 struct dma_features;
diff --git a/drivers/net/ethernet/stmicro/stmmac/norm_desc.c b/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
index 7b1d901..6cf2c7c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
@@ -297,6 +297,11 @@ static void ndesc_display_ring(void *head, unsigned int size, bool rx)
 	pr_info("\n");
 }
 
+static void ndesc_set_addr(struct dma_desc *p, dma_addr_t addr)
+{
+	p->des2 = cpu_to_le32(addr);
+}
+
 const struct stmmac_desc_ops ndesc_ops = {
 	.tx_status = ndesc_get_tx_status,
 	.rx_status = ndesc_get_rx_status,
@@ -316,4 +321,5 @@ static void ndesc_display_ring(void *head, unsigned int size, bool rx)
 	.get_timestamp = ndesc_get_timestamp,
 	.get_rx_timestamp_status = ndesc_get_rx_timestamp_status,
 	.display_ring = ndesc_display_ring,
+	.set_addr = ndesc_set_addr,
 };
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 84b29ef..c972d44 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1156,10 +1156,7 @@ static int stmmac_init_rx_buffers(struct stmmac_priv *priv, struct dma_desc *p,
 		return -EINVAL;
 	}
 
-	if (priv->synopsys_id >= DWMAC_CORE_4_00)
-		p->des0 = cpu_to_le32(rx_q->rx_skbuff_dma[i]);
-	else
-		p->des2 = cpu_to_le32(rx_q->rx_skbuff_dma[i]);
+	stmmac_set_desc_addr(priv, p, rx_q->rx_skbuff_dma[i]);
 
 	if (priv->dma_buf_sz == BUF_SIZE_16KiB)
 		stmmac_init_desc3(priv, p);
@@ -3096,10 +3093,8 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
 			goto dma_map_err; /* should reuse desc w/o issues */
 
 		tx_q->tx_skbuff_dma[entry].buf = des;
-		if (unlikely(priv->synopsys_id >= DWMAC_CORE_4_00))
-			desc->des0 = cpu_to_le32(des);
-		else
-			desc->des2 = cpu_to_le32(des);
+
+		stmmac_set_desc_addr(priv, desc, des);
 
 		tx_q->tx_skbuff_dma[entry].map_as_page = true;
 		tx_q->tx_skbuff_dma[entry].len = len;
@@ -3178,10 +3173,8 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
 			goto dma_map_err;
 
 		tx_q->tx_skbuff_dma[first_entry].buf = des;
-		if (unlikely(priv->synopsys_id >= DWMAC_CORE_4_00))
-			first->des0 = cpu_to_le32(des);
-		else
-			first->des2 = cpu_to_le32(des);
+
+		stmmac_set_desc_addr(priv, first, des);
 
 		tx_q->tx_skbuff_dma[first_entry].len = nopaged_len;
 		tx_q->tx_skbuff_dma[first_entry].last_segment = last_segment;
@@ -3295,13 +3288,7 @@ static inline void stmmac_rx_refill(struct stmmac_priv *priv, u32 queue)
 				break;
 			}
 
-			if (unlikely(priv->synopsys_id >= DWMAC_CORE_4_00)) {
-				p->des0 = cpu_to_le32(rx_q->rx_skbuff_dma[entry]);
-				p->des1 = 0;
-			} else {
-				p->des2 = cpu_to_le32(rx_q->rx_skbuff_dma[entry]);
-			}
-
+			stmmac_set_desc_addr(priv, p, rx_q->rx_skbuff_dma[entry]);
 			stmmac_refill_desc3(priv, rx_q, p);
 
 			if (rx_q->rx_zeroc_thresh > 0)
-- 
1.7.1

[PATCH net-next 02/10] net: stmmac: Let descriptor code clear the descriptor

[Jose Abreu]

Stop using if conditions depending on the GMAC version for clearing the
descriptor and use instead a helper implemented in the descriptor files.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Joao Pinto <jpinto@synopsys.com>
Cc: Vitor Soares <soares@synopsys.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c |    9 +++++++++
 drivers/net/ethernet/stmicro/stmmac/enh_desc.c     |    6 ++++++
 drivers/net/ethernet/stmicro/stmmac/hwif.h         |    4 ++++
 drivers/net/ethernet/stmicro/stmmac/norm_desc.c    |    6 ++++++
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  |    9 +--------
 5 files changed, 26 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
index f67caa1..119a2f9 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
@@ -430,6 +430,14 @@ static void dwmac4_set_addr(struct dma_desc *p, dma_addr_t addr)
 	p->des1 = 0;
 }
 
+static void dwmac4_clear(struct dma_desc *p)
+{
+	p->des0 = 0;
+	p->des1 = 0;
+	p->des2 = 0;
+	p->des3 = 0;
+}
+
 const struct stmmac_desc_ops dwmac4_desc_ops = {
 	.tx_status = dwmac4_wrback_get_tx_status,
 	.rx_status = dwmac4_wrback_get_rx_status,
@@ -452,6 +460,7 @@ static void dwmac4_set_addr(struct dma_desc *p, dma_addr_t addr)
 	.display_ring = dwmac4_display_ring,
 	.set_mss = dwmac4_set_mss_ctxt,
 	.set_addr = dwmac4_set_addr,
+	.clear = dwmac4_clear,
 };
 
 const struct stmmac_mode_ops dwmac4_ring_mode_ops = { };
diff --git a/drivers/net/ethernet/stmicro/stmmac/enh_desc.c b/drivers/net/ethernet/stmicro/stmmac/enh_desc.c
index 02749e4..17cd26f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/enh_desc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/enh_desc.c
@@ -442,6 +442,11 @@ static void enh_desc_set_addr(struct dma_desc *p, dma_addr_t addr)
 	p->des2 = cpu_to_le32(addr);
 }
 
+static void enh_desc_clear(struct dma_desc *p)
+{
+	p->des2 = 0;
+}
+
 const struct stmmac_desc_ops enh_desc_ops = {
 	.tx_status = enh_desc_get_tx_status,
 	.rx_status = enh_desc_get_rx_status,
@@ -463,4 +468,5 @@ static void enh_desc_set_addr(struct dma_desc *p, dma_addr_t addr)
 	.get_rx_timestamp_status = enh_desc_get_rx_timestamp_status,
 	.display_ring = enh_desc_display_ring,
 	.set_addr = enh_desc_set_addr,
+	.clear = enh_desc_clear,
 };
diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.h b/drivers/net/ethernet/stmicro/stmmac/hwif.h
index d66d194..a6b9c97 100644
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.h
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h
@@ -81,6 +81,8 @@ struct stmmac_desc_ops {
 	void (*set_mss)(struct dma_desc *p, unsigned int mss);
 	/* set descriptor skbuff address */
 	void (*set_addr)(struct dma_desc *p, dma_addr_t addr);
+	/* clear descriptor */
+	void (*clear)(struct dma_desc *p);
 };
 
 #define stmmac_init_rx_desc(__priv, __args...) \
@@ -127,6 +129,8 @@ struct stmmac_desc_ops {
 	stmmac_do_void_callback(__priv, desc, set_mss, __args)
 #define stmmac_set_desc_addr(__priv, __args...) \
 	stmmac_do_void_callback(__priv, desc, set_addr, __args)
+#define stmmac_clear_desc(__priv, __args...) \
+	stmmac_do_void_callback(__priv, desc, clear, __args)
 
 struct stmmac_dma_cfg;
 struct dma_features;
diff --git a/drivers/net/ethernet/stmicro/stmmac/norm_desc.c b/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
index 6cf2c7c..a7b221b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
@@ -302,6 +302,11 @@ static void ndesc_set_addr(struct dma_desc *p, dma_addr_t addr)
 	p->des2 = cpu_to_le32(addr);
 }
 
+static void ndesc_clear(struct dma_desc *p)
+{
+	p->des2 = 0;
+}
+
 const struct stmmac_desc_ops ndesc_ops = {
 	.tx_status = ndesc_get_tx_status,
 	.rx_status = ndesc_get_rx_status,
@@ -322,4 +327,5 @@ static void ndesc_set_addr(struct dma_desc *p, dma_addr_t addr)
 	.get_rx_timestamp_status = ndesc_get_rx_timestamp_status,
 	.display_ring = ndesc_display_ring,
 	.set_addr = ndesc_set_addr,
+	.clear = ndesc_clear,
 };
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index c972d44..3fa9f42 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1341,14 +1341,7 @@ static int init_dma_tx_desc_rings(struct net_device *dev)
 			else
 				p = tx_q->dma_tx + i;
 
-			if (priv->synopsys_id >= DWMAC_CORE_4_00) {
-				p->des0 = 0;
-				p->des1 = 0;
-				p->des2 = 0;
-				p->des3 = 0;
-			} else {
-				p->des2 = 0;
-			}
+			stmmac_clear_desc(priv, p);
 
 			tx_q->tx_skbuff_dma[i].buf = 0;
 			tx_q->tx_skbuff_dma[i].map_as_page = false;
-- 
1.7.1

[PATCH net-next 03/10] net: stmmac: Uniformize the use of dma_{rx/tx}_mode callbacks

[Jose Abreu]

Instead of relying on the GMAC version for choosing if we need to use
dma_{rx/tx}_mode or just dma_mode callback lets uniformize this and
always use the dma_{rx/tx}_mode callbacks.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Joao Pinto <jpinto@synopsys.com>
Cc: Vitor Soares <soares@synopsys.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c  |   57 +++++++++-------
 .../net/ethernet/stmicro/stmmac/dwmac1000_dma.c    |   67 +++++++++++---------
 drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c |   10 ++--
 drivers/net/ethernet/stmicro/stmmac/hwif.h         |    6 --
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  |   32 +++------
 5 files changed, 86 insertions(+), 86 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
index a3fa65b..4dafc6b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
@@ -398,13 +398,36 @@ static int sun8i_dwmac_dma_interrupt(void __iomem *ioaddr,
 	return ret;
 }
 
-static void sun8i_dwmac_dma_operation_mode(void __iomem *ioaddr, int txmode,
-					   int rxmode, int rxfifosz)
+static void sun8i_dwmac_dma_operation_mode_rx(void __iomem *ioaddr, int mode,
+					      u32 channel, int fifosz, u8 qmode)
+{
+	u32 v;
+
+	v = readl(ioaddr + EMAC_RX_CTL1);
+	if (mode == SF_DMA_MODE) {
+		v |= EMAC_RX_MD;
+	} else {
+		v &= ~EMAC_RX_MD;
+		v &= ~EMAC_RX_TH_MASK;
+		if (mode < 32)
+			v |= EMAC_RX_TH_32;
+		else if (mode < 64)
+			v |= EMAC_RX_TH_64;
+		else if (mode < 96)
+			v |= EMAC_RX_TH_96;
+		else if (mode < 128)
+			v |= EMAC_RX_TH_128;
+	}
+	writel(v, ioaddr + EMAC_RX_CTL1);
+}
+
+static void sun8i_dwmac_dma_operation_mode_tx(void __iomem *ioaddr, int mode,
+					      u32 channel, int fifosz, u8 qmode)
 {
 	u32 v;
 
 	v = readl(ioaddr + EMAC_TX_CTL1);
-	if (txmode == SF_DMA_MODE) {
+	if (mode == SF_DMA_MODE) {
 		v |= EMAC_TX_MD;
 		/* Undocumented bit (called TX_NEXT_FRM in BSP), the original
 		 * comment is
@@ -415,40 +438,24 @@ static void sun8i_dwmac_dma_operation_mode(void __iomem *ioaddr, int txmode,
 	} else {
 		v &= ~EMAC_TX_MD;
 		v &= ~EMAC_TX_TH_MASK;
-		if (txmode < 64)
+		if (mode < 64)
 			v |= EMAC_TX_TH_64;
-		else if (txmode < 128)
+		else if (mode < 128)
 			v |= EMAC_TX_TH_128;
-		else if (txmode < 192)
+		else if (mode < 192)
 			v |= EMAC_TX_TH_192;
-		else if (txmode < 256)
+		else if (mode < 256)
 			v |= EMAC_TX_TH_256;
 	}
 	writel(v, ioaddr + EMAC_TX_CTL1);
-
-	v = readl(ioaddr + EMAC_RX_CTL1);
-	if (rxmode == SF_DMA_MODE) {
-		v |= EMAC_RX_MD;
-	} else {
-		v &= ~EMAC_RX_MD;
-		v &= ~EMAC_RX_TH_MASK;
-		if (rxmode < 32)
-			v |= EMAC_RX_TH_32;
-		else if (rxmode < 64)
-			v |= EMAC_RX_TH_64;
-		else if (rxmode < 96)
-			v |= EMAC_RX_TH_96;
-		else if (rxmode < 128)
-			v |= EMAC_RX_TH_128;
-	}
-	writel(v, ioaddr + EMAC_RX_CTL1);
 }
 
 static const struct stmmac_dma_ops sun8i_dwmac_dma_ops = {
 	.reset = sun8i_dwmac_dma_reset,
 	.init = sun8i_dwmac_dma_init,
 	.dump_regs = sun8i_dwmac_dump_regs,
-	.dma_mode = sun8i_dwmac_dma_operation_mode,
+	.dma_rx_mode = sun8i_dwmac_dma_operation_mode_rx,
+	.dma_tx_mode = sun8i_dwmac_dma_operation_mode_tx,
 	.enable_dma_transmission = sun8i_dwmac_enable_dma_transmission,
 	.enable_dma_irq = sun8i_dwmac_enable_dma_irq,
 	.disable_dma_irq = sun8i_dwmac_disable_dma_irq,
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
index 7ecf549..d7447b0 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
@@ -148,12 +148,40 @@ static u32 dwmac1000_configure_fc(u32 csr6, int rxfifosz)
 	return csr6;
 }
 
-static void dwmac1000_dma_operation_mode(void __iomem *ioaddr, int txmode,
-					 int rxmode, int rxfifosz)
+static void dwmac1000_dma_operation_mode_rx(void __iomem *ioaddr, int mode,
+					    u32 channel, int fifosz, u8 qmode)
 {
 	u32 csr6 = readl(ioaddr + DMA_CONTROL);
 
-	if (txmode == SF_DMA_MODE) {
+	if (mode == SF_DMA_MODE) {
+		pr_debug("GMAC: enable RX store and forward mode\n");
+		csr6 |= DMA_CONTROL_RSF;
+	} else {
+		pr_debug("GMAC: disable RX SF mode (threshold %d)\n", mode);
+		csr6 &= ~DMA_CONTROL_RSF;
+		csr6 &= DMA_CONTROL_TC_RX_MASK;
+		if (mode <= 32)
+			csr6 |= DMA_CONTROL_RTC_32;
+		else if (mode <= 64)
+			csr6 |= DMA_CONTROL_RTC_64;
+		else if (mode <= 96)
+			csr6 |= DMA_CONTROL_RTC_96;
+		else
+			csr6 |= DMA_CONTROL_RTC_128;
+	}
+
+	/* Configure flow control based on rx fifo size */
+	csr6 = dwmac1000_configure_fc(csr6, fifosz);
+
+	writel(csr6, ioaddr + DMA_CONTROL);
+}
+
+static void dwmac1000_dma_operation_mode_tx(void __iomem *ioaddr, int mode,
+					    u32 channel, int fifosz, u8 qmode)
+{
+	u32 csr6 = readl(ioaddr + DMA_CONTROL);
+
+	if (mode == SF_DMA_MODE) {
 		pr_debug("GMAC: enable TX store and forward mode\n");
 		/* Transmit COE type 2 cannot be done in cut-through mode. */
 		csr6 |= DMA_CONTROL_TSF;
@@ -162,42 +190,22 @@ static void dwmac1000_dma_operation_mode(void __iomem *ioaddr, int txmode,
 		 */
 		csr6 |= DMA_CONTROL_OSF;
 	} else {
-		pr_debug("GMAC: disabling TX SF (threshold %d)\n", txmode);
+		pr_debug("GMAC: disabling TX SF (threshold %d)\n", mode);
 		csr6 &= ~DMA_CONTROL_TSF;
 		csr6 &= DMA_CONTROL_TC_TX_MASK;
 		/* Set the transmit threshold */
-		if (txmode <= 32)
+		if (mode <= 32)
 			csr6 |= DMA_CONTROL_TTC_32;
-		else if (txmode <= 64)
+		else if (mode <= 64)
 			csr6 |= DMA_CONTROL_TTC_64;
-		else if (txmode <= 128)
+		else if (mode <= 128)
 			csr6 |= DMA_CONTROL_TTC_128;
-		else if (txmode <= 192)
+		else if (mode <= 192)
 			csr6 |= DMA_CONTROL_TTC_192;
 		else
 			csr6 |= DMA_CONTROL_TTC_256;
 	}
 
-	if (rxmode == SF_DMA_MODE) {
-		pr_debug("GMAC: enable RX store and forward mode\n");
-		csr6 |= DMA_CONTROL_RSF;
-	} else {
-		pr_debug("GMAC: disable RX SF mode (threshold %d)\n", rxmode);
-		csr6 &= ~DMA_CONTROL_RSF;
-		csr6 &= DMA_CONTROL_TC_RX_MASK;
-		if (rxmode <= 32)
-			csr6 |= DMA_CONTROL_RTC_32;
-		else if (rxmode <= 64)
-			csr6 |= DMA_CONTROL_RTC_64;
-		else if (rxmode <= 96)
-			csr6 |= DMA_CONTROL_RTC_96;
-		else
-			csr6 |= DMA_CONTROL_RTC_128;
-	}
-
-	/* Configure flow control based on rx fifo size */
-	csr6 = dwmac1000_configure_fc(csr6, rxfifosz);
-
 	writel(csr6, ioaddr + DMA_CONTROL);
 }
 
@@ -258,7 +266,8 @@ static void dwmac1000_rx_watchdog(void __iomem *ioaddr, u32 riwt,
 	.init = dwmac1000_dma_init,
 	.axi = dwmac1000_dma_axi,
 	.dump_regs = dwmac1000_dump_dma_regs,
-	.dma_mode = dwmac1000_dma_operation_mode,
+	.dma_rx_mode = dwmac1000_dma_operation_mode_rx,
+	.dma_tx_mode = dwmac1000_dma_operation_mode_tx,
 	.enable_dma_transmission = dwmac_enable_dma_transmission,
 	.enable_dma_irq = dwmac_enable_dma_irq,
 	.disable_dma_irq = dwmac_disable_dma_irq,
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c
index 6502b9a..80339d3 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c
@@ -51,14 +51,14 @@ static void dwmac100_dma_init(void __iomem *ioaddr,
  * The transmit threshold can be programmed by setting the TTC bits in the DMA
  * control register.
  */
-static void dwmac100_dma_operation_mode(void __iomem *ioaddr, int txmode,
-					int rxmode, int rxfifosz)
+static void dwmac100_dma_operation_mode_tx(void __iomem *ioaddr, int mode,
+					   u32 channel, int fifosz, u8 qmode)
 {
 	u32 csr6 = readl(ioaddr + DMA_CONTROL);
 
-	if (txmode <= 32)
+	if (mode <= 32)
 		csr6 |= DMA_CONTROL_TTC_32;
-	else if (txmode <= 64)
+	else if (mode <= 64)
 		csr6 |= DMA_CONTROL_TTC_64;
 	else
 		csr6 |= DMA_CONTROL_TTC_128;
@@ -113,7 +113,7 @@ static void dwmac100_dma_diagnostic_fr(void *data, struct stmmac_extra_stats *x,
 	.reset = dwmac_dma_reset,
 	.init = dwmac100_dma_init,
 	.dump_regs = dwmac100_dump_dma_regs,
-	.dma_mode = dwmac100_dma_operation_mode,
+	.dma_tx_mode = dwmac100_dma_operation_mode_tx,
 	.dma_diagnostic_fr = dwmac100_dma_diagnostic_fr,
 	.enable_dma_transmission = dwmac_enable_dma_transmission,
 	.enable_dma_irq = dwmac_enable_dma_irq,
diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.h b/drivers/net/ethernet/stmicro/stmmac/hwif.h
index a6b9c97..3ff4afe 100644
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.h
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h
@@ -153,10 +153,6 @@ struct stmmac_dma_ops {
 	void (*axi)(void __iomem *ioaddr, struct stmmac_axi *axi);
 	/* Dump DMA registers */
 	void (*dump_regs)(void __iomem *ioaddr, u32 *reg_space);
-	/* Set tx/rx threshold in the csr6 register
-	 * An invalid value enables the store-and-forward mode */
-	void (*dma_mode)(void __iomem *ioaddr, int txmode, int rxmode,
-			 int rxfifosz);
 	void (*dma_rx_mode)(void __iomem *ioaddr, int mode, u32 channel,
 			    int fifosz, u8 qmode);
 	void (*dma_tx_mode)(void __iomem *ioaddr, int mode, u32 channel,
@@ -199,8 +195,6 @@ struct stmmac_dma_ops {
 	stmmac_do_void_callback(__priv, dma, axi, __args)
 #define stmmac_dump_dma_regs(__priv, __args...) \
 	stmmac_do_void_callback(__priv, dma, dump_regs, __args)
-#define stmmac_dma_mode(__priv, __args...) \
-	stmmac_do_void_callback(__priv, dma, dma_mode, __args)
 #define stmmac_dma_rx_mode(__priv, __args...) \
 	stmmac_do_void_callback(__priv, dma, dma_rx_mode, __args)
 #define stmmac_dma_tx_mode(__priv, __args...) \
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 3fa9f42..c188c00 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1787,22 +1787,18 @@ static void stmmac_dma_operation_mode(struct stmmac_priv *priv)
 	}
 
 	/* configure all channels */
-	if (priv->synopsys_id >= DWMAC_CORE_4_00) {
-		for (chan = 0; chan < rx_channels_count; chan++) {
-			qmode = priv->plat->rx_queues_cfg[chan].mode_to_use;
+	for (chan = 0; chan < rx_channels_count; chan++) {
+		qmode = priv->plat->rx_queues_cfg[chan].mode_to_use;
 
-			stmmac_dma_rx_mode(priv, priv->ioaddr, rxmode, chan,
-					rxfifosz, qmode);
-		}
+		stmmac_dma_rx_mode(priv, priv->ioaddr, rxmode, chan,
+				rxfifosz, qmode);
+	}
 
-		for (chan = 0; chan < tx_channels_count; chan++) {
-			qmode = priv->plat->tx_queues_cfg[chan].mode_to_use;
+	for (chan = 0; chan < tx_channels_count; chan++) {
+		qmode = priv->plat->tx_queues_cfg[chan].mode_to_use;
 
-			stmmac_dma_tx_mode(priv, priv->ioaddr, txmode, chan,
-					txfifosz, qmode);
-		}
-	} else {
-		stmmac_dma_mode(priv, priv->ioaddr, txmode, rxmode, rxfifosz);
+		stmmac_dma_tx_mode(priv, priv->ioaddr, txmode, chan,
+				txfifosz, qmode);
 	}
 }
 
@@ -1971,14 +1967,8 @@ static void stmmac_set_dma_operation_mode(struct stmmac_priv *priv, u32 txmode,
 	rxfifosz /= rx_channels_count;
 	txfifosz /= tx_channels_count;
 
-	if (priv->synopsys_id >= DWMAC_CORE_4_00) {
-		stmmac_dma_rx_mode(priv, priv->ioaddr, rxmode, chan, rxfifosz,
-				rxqmode);
-		stmmac_dma_tx_mode(priv, priv->ioaddr, txmode, chan, txfifosz,
-				txqmode);
-	} else {
-		stmmac_dma_mode(priv, priv->ioaddr, txmode, rxmode, rxfifosz);
-	}
+	stmmac_dma_rx_mode(priv, priv->ioaddr, rxmode, chan, rxfifosz, rxqmode);
+	stmmac_dma_tx_mode(priv, priv->ioaddr, txmode, chan, txfifosz, txqmode);
 }
 
 static bool stmmac_safety_feat_interrupt(struct stmmac_priv *priv)
-- 
1.7.1

[PATCH net-next 04/10] net: stmmac: Remove uneeded checks for GMAC version

[Jose Abreu]

With the introducion of callbacks check in hwif.h we only call the
callback if HW supports it so there is no longer need to check for GMAC
version.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Joao Pinto <jpinto@synopsys.com>
Cc: Vitor Soares <soares@synopsys.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |   16 +++++-----------
 1 files changed, 5 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index c188c00..a45f565 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1973,11 +1973,8 @@ static void stmmac_set_dma_operation_mode(struct stmmac_priv *priv, u32 txmode,
 
 static bool stmmac_safety_feat_interrupt(struct stmmac_priv *priv)
 {
-	int ret = false;
+	int ret;
 
-	/* Safety features are only available in cores >= 5.10 */
-	if (priv->synopsys_id < DWMAC_CORE_5_10)
-		return ret;
 	ret = stmmac_safety_feat_irq_status(priv, priv->dev,
 			priv->ioaddr, priv->dma_cap.asp, &priv->sstats);
 	if (ret && (ret != -EINVAL)) {
@@ -2491,12 +2488,10 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
 	stmmac_core_init(priv, priv->hw, dev);
 
 	/* Initialize MTL*/
-	if (priv->synopsys_id >= DWMAC_CORE_4_00)
-		stmmac_mtl_configuration(priv);
+	stmmac_mtl_configuration(priv);
 
 	/* Initialize Safety Features */
-	if (priv->synopsys_id >= DWMAC_CORE_5_10)
-		stmmac_safety_feat_configuration(priv);
+	stmmac_safety_feat_configuration(priv);
 
 	ret = stmmac_rx_ipc(priv, priv->hw);
 	if (!ret) {
@@ -3050,10 +3045,9 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
 	if (enh_desc)
 		is_jumbo = stmmac_is_jumbo_frm(priv, skb->len, enh_desc);
 
-	if (unlikely(is_jumbo) && likely(priv->synopsys_id <
-					 DWMAC_CORE_4_00)) {
+	if (unlikely(is_jumbo)) {
 		entry = stmmac_jumbo_frm(priv, tx_q, skb, csum_insertion);
-		if (unlikely(entry < 0))
+		if (unlikely(entry < 0) && (entry != -EINVAL))
 			goto dma_map_err;
 	}
 
-- 
1.7.1

[PATCH net-next 05/10] net: stmmac: Move PTP and MMC base address calculation to hwif.c

[Jose Abreu]

PTP and MMC modules base address can depend on the GMAC version. As this
is HW specific lets move this base address calculation to hwif.c. Also,
add an entry in the HW table so that we can specify the module offset.
This can later be extended to more modules, if deemed necessary.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Joao Pinto <jpinto@synopsys.com>
Cc: Vitor Soares <soares@synopsys.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
---
 drivers/net/ethernet/stmicro/stmmac/hwif.c        |   34 +++++++++++++++++++++
 drivers/net/ethernet/stmicro/stmmac/hwif.h        |    5 +++
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |    8 -----
 3 files changed, 39 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.c b/drivers/net/ethernet/stmicro/stmmac/hwif.c
index 9acc8d2..23a1264 100644
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.c
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.c
@@ -6,6 +6,7 @@
 
 #include "common.h"
 #include "stmmac.h"
+#include "stmmac_ptp.h"
 
 static u32 stmmac_get_id(struct stmmac_priv *priv, u32 id_reg)
 {
@@ -72,6 +73,7 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 	bool gmac;
 	bool gmac4;
 	u32 min_id;
+	const struct stmmac_regs_off regs;
 	const void *desc;
 	const void *dma;
 	const void *mac;
@@ -86,6 +88,10 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 		.gmac = false,
 		.gmac4 = false,
 		.min_id = 0,
+		.regs = {
+			.ptp_off = PTP_GMAC3_X_OFFSET,
+			.mmc_off = MMC_GMAC3_X_OFFSET,
+		},
 		.desc = NULL,
 		.dma = &dwmac100_dma_ops,
 		.mac = &dwmac100_ops,
@@ -98,6 +104,10 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 		.gmac = true,
 		.gmac4 = false,
 		.min_id = 0,
+		.regs = {
+			.ptp_off = PTP_GMAC3_X_OFFSET,
+			.mmc_off = MMC_GMAC3_X_OFFSET,
+		},
 		.desc = NULL,
 		.dma = &dwmac1000_dma_ops,
 		.mac = &dwmac1000_ops,
@@ -110,6 +120,10 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 		.gmac = false,
 		.gmac4 = true,
 		.min_id = 0,
+		.regs = {
+			.ptp_off = PTP_GMAC4_OFFSET,
+			.mmc_off = MMC_GMAC4_OFFSET,
+		},
 		.desc = &dwmac4_desc_ops,
 		.dma = &dwmac4_dma_ops,
 		.mac = &dwmac4_ops,
@@ -122,6 +136,10 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 		.gmac = false,
 		.gmac4 = true,
 		.min_id = DWMAC_CORE_4_00,
+		.regs = {
+			.ptp_off = PTP_GMAC4_OFFSET,
+			.mmc_off = MMC_GMAC4_OFFSET,
+		},
 		.desc = &dwmac4_desc_ops,
 		.dma = &dwmac4_dma_ops,
 		.mac = &dwmac410_ops,
@@ -134,6 +152,10 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 		.gmac = false,
 		.gmac4 = true,
 		.min_id = DWMAC_CORE_4_10,
+		.regs = {
+			.ptp_off = PTP_GMAC4_OFFSET,
+			.mmc_off = MMC_GMAC4_OFFSET,
+		},
 		.desc = &dwmac4_desc_ops,
 		.dma = &dwmac410_dma_ops,
 		.mac = &dwmac410_ops,
@@ -146,6 +168,10 @@ static int stmmac_dwmac4_quirks(struct stmmac_priv *priv)
 		.gmac = false,
 		.gmac4 = true,
 		.min_id = DWMAC_CORE_5_10,
+		.regs = {
+			.ptp_off = PTP_GMAC4_OFFSET,
+			.mmc_off = MMC_GMAC4_OFFSET,
+		},
 		.desc = &dwmac4_desc_ops,
 		.dma = &dwmac410_dma_ops,
 		.mac = &dwmac510_ops,
@@ -175,6 +201,12 @@ int stmmac_hwif_init(struct stmmac_priv *priv)
 	/* Save ID for later use */
 	priv->synopsys_id = id;
 
+	/* Lets assume some safe values first */
+	priv->ptpaddr = priv->ioaddr +
+		(needs_gmac4 ? PTP_GMAC4_OFFSET : PTP_GMAC3_X_OFFSET);
+	priv->mmcaddr = priv->ioaddr +
+		(needs_gmac4 ? MMC_GMAC4_OFFSET : MMC_GMAC3_X_OFFSET);
+
 	/* Check for HW specific setup first */
 	if (priv->plat->setup) {
 		priv->hw = priv->plat->setup(priv);
@@ -206,6 +238,8 @@ int stmmac_hwif_init(struct stmmac_priv *priv)
 		mac->tc = entry->tc;
 
 		priv->hw = mac;
+		priv->ptpaddr = priv->ioaddr + entry->regs.ptp_off;
+		priv->mmcaddr = priv->ioaddr + entry->regs.mmc_off;
 
 		/* Entry found */
 		ret = entry->setup(priv);
diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.h b/drivers/net/ethernet/stmicro/stmmac/hwif.h
index 3ff4afe..06fb20b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.h
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h
@@ -442,6 +442,11 @@ struct stmmac_tc_ops {
 #define stmmac_tc_setup_cls_u32(__priv, __args...) \
 	stmmac_do_callback(__priv, tc, setup_cls_u32, __args)
 
+struct stmmac_regs_off {
+	u32 ptp_off;
+	u32 mmc_off;
+};
+
 extern const struct stmmac_ops dwmac100_ops;
 extern const struct stmmac_dma_ops dwmac100_dma_ops;
 extern const struct stmmac_ops dwmac1000_ops;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index a45f565..e433157 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -2081,14 +2081,6 @@ static void stmmac_mmc_setup(struct stmmac_priv *priv)
 	unsigned int mode = MMC_CNTRL_RESET_ON_READ | MMC_CNTRL_COUNTER_RESET |
 			    MMC_CNTRL_PRESET | MMC_CNTRL_FULL_HALF_PRESET;
 
-	if (priv->synopsys_id >= DWMAC_CORE_4_00) {
-		priv->ptpaddr = priv->ioaddr + PTP_GMAC4_OFFSET;
-		priv->mmcaddr = priv->ioaddr + MMC_GMAC4_OFFSET;
-	} else {
-		priv->ptpaddr = priv->ioaddr + PTP_GMAC3_X_OFFSET;
-		priv->mmcaddr = priv->ioaddr + MMC_GMAC3_X_OFFSET;
-	}
-
 	dwmac_mmc_intr_all_mask(priv->mmcaddr);
 
 	if (priv->dma_cap.rmon) {
-- 
1.7.1

[PATCH net-next 06/10] net: stmmac: Uniformize the use of dma_init_* callbacks

[Jose Abreu]

Instead of relying on the GMAC version for choosing if we need to use
dma_init or dma_init_{rx/tx}_chan callback, lets uniformize this and
always use the dma_init_{rx/tx}_chan callbacks.

While at it, fix the use of dma_init_chan callback, which shall be
called for as many channels as the max of rx/tx channels.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Joao Pinto <jpinto@synopsys.com>
Cc: Vitor Soares <soares@synopsys.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
---
 .../net/ethernet/stmicro/stmmac/dwmac1000_dma.c    |   25 ++++++--
 drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c |   25 ++++++--
 drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c   |    3 +-
 drivers/net/ethernet/stmicro/stmmac/hwif.h         |    2 +-
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  |   62 ++++++++-----------
 5 files changed, 64 insertions(+), 53 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
index d7447b0..aacc4aa 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
@@ -81,8 +81,7 @@ static void dwmac1000_dma_axi(void __iomem *ioaddr, struct stmmac_axi *axi)
 }
 
 static void dwmac1000_dma_init(void __iomem *ioaddr,
-			       struct stmmac_dma_cfg *dma_cfg,
-			       u32 dma_tx, u32 dma_rx, int atds)
+			       struct stmmac_dma_cfg *dma_cfg, int atds)
 {
 	u32 value = readl(ioaddr + DMA_BUS_MODE);
 	int txpbl = dma_cfg->txpbl ?: dma_cfg->pbl;
@@ -119,12 +118,22 @@ static void dwmac1000_dma_init(void __iomem *ioaddr,
 
 	/* Mask interrupts by writing to CSR7 */
 	writel(DMA_INTR_DEFAULT_MASK, ioaddr + DMA_INTR_ENA);
+}
 
-	/* RX/TX descriptor base address lists must be written into
-	 * DMA CSR3 and CSR4, respectively
-	 */
-	writel(dma_tx, ioaddr + DMA_TX_BASE_ADDR);
-	writel(dma_rx, ioaddr + DMA_RCV_BASE_ADDR);
+static void dwmac1000_dma_init_rx(void __iomem *ioaddr,
+				  struct stmmac_dma_cfg *dma_cfg,
+				  u32 dma_rx_phy, u32 chan)
+{
+	/* RX descriptor base address list must be written into DMA CSR3 */
+	writel(dma_rx_phy, ioaddr + DMA_RCV_BASE_ADDR);
+}
+
+static void dwmac1000_dma_init_tx(void __iomem *ioaddr,
+				  struct stmmac_dma_cfg *dma_cfg,
+				  u32 dma_tx_phy, u32 chan)
+{
+	/* TX descriptor base address list must be written into DMA CSR4 */
+	writel(dma_tx_phy, ioaddr + DMA_TX_BASE_ADDR);
 }
 
 static u32 dwmac1000_configure_fc(u32 csr6, int rxfifosz)
@@ -264,6 +273,8 @@ static void dwmac1000_rx_watchdog(void __iomem *ioaddr, u32 riwt,
 const struct stmmac_dma_ops dwmac1000_dma_ops = {
 	.reset = dwmac_dma_reset,
 	.init = dwmac1000_dma_init,
+	.init_rx_chan = dwmac1000_dma_init_rx,
+	.init_tx_chan = dwmac1000_dma_init_tx,
 	.axi = dwmac1000_dma_axi,
 	.dump_regs = dwmac1000_dump_dma_regs,
 	.dma_rx_mode = dwmac1000_dma_operation_mode_rx,
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c
index 80339d3..21dee25 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c
@@ -29,8 +29,7 @@
 #include "dwmac_dma.h"
 
 static void dwmac100_dma_init(void __iomem *ioaddr,
-			      struct stmmac_dma_cfg *dma_cfg,
-			      u32 dma_tx, u32 dma_rx, int atds)
+			      struct stmmac_dma_cfg *dma_cfg, int atds)
 {
 	/* Enable Application Access by writing to DMA CSR0 */
 	writel(DMA_BUS_MODE_DEFAULT | (dma_cfg->pbl << DMA_BUS_MODE_PBL_SHIFT),
@@ -38,12 +37,22 @@ static void dwmac100_dma_init(void __iomem *ioaddr,
 
 	/* Mask interrupts by writing to CSR7 */
 	writel(DMA_INTR_DEFAULT_MASK, ioaddr + DMA_INTR_ENA);
+}
 
-	/* RX/TX descriptor base addr lists must be written into
-	 * DMA CSR3 and CSR4, respectively
-	 */
-	writel(dma_tx, ioaddr + DMA_TX_BASE_ADDR);
-	writel(dma_rx, ioaddr + DMA_RCV_BASE_ADDR);
+static void dwmac100_dma_init_rx(void __iomem *ioaddr,
+				 struct stmmac_dma_cfg *dma_cfg,
+				 u32 dma_rx_phy, u32 chan)
+{
+	/* RX descriptor base addr lists must be written into DMA CSR3 */
+	writel(dma_rx_phy, ioaddr + DMA_RCV_BASE_ADDR);
+}
+
+static void dwmac100_dma_init_tx(void __iomem *ioaddr,
+				 struct stmmac_dma_cfg *dma_cfg,
+				 u32 dma_tx_phy, u32 chan)
+{
+	/* TX descriptor base addr lists must be written into DMA CSR4 */
+	writel(dma_tx_phy, ioaddr + DMA_TX_BASE_ADDR);
 }
 
 /* Store and Forward capability is not used at all.
@@ -112,6 +121,8 @@ static void dwmac100_dma_diagnostic_fr(void *data, struct stmmac_extra_stats *x,
 const struct stmmac_dma_ops dwmac100_dma_ops = {
 	.reset = dwmac_dma_reset,
 	.init = dwmac100_dma_init,
+	.init_rx_chan = dwmac100_dma_init_rx,
+	.init_tx_chan = dwmac100_dma_init_tx,
 	.dump_regs = dwmac100_dump_dma_regs,
 	.dma_tx_mode = dwmac100_dma_operation_mode_tx,
 	.dma_diagnostic_fr = dwmac100_dma_diagnostic_fr,
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
index 117c3a5..f0024ff 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
@@ -116,8 +116,7 @@ static void dwmac4_dma_init_channel(void __iomem *ioaddr,
 }
 
 static void dwmac4_dma_init(void __iomem *ioaddr,
-			    struct stmmac_dma_cfg *dma_cfg,
-			    u32 dma_tx, u32 dma_rx, int atds)
+			    struct stmmac_dma_cfg *dma_cfg, int atds)
 {
 	u32 value = readl(ioaddr + DMA_SYS_BUS_MODE);
 
diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.h b/drivers/net/ethernet/stmicro/stmmac/hwif.h
index 06fb20b..1c674d6 100644
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.h
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h
@@ -140,7 +140,7 @@ struct stmmac_dma_ops {
 	/* DMA core initialization */
 	int (*reset)(void __iomem *ioaddr);
 	void (*init)(void __iomem *ioaddr, struct stmmac_dma_cfg *dma_cfg,
-		     u32 dma_tx, u32 dma_rx, int atds);
+		     int atds);
 	void (*init_chan)(void __iomem *ioaddr,
 			  struct stmmac_dma_cfg *dma_cfg, u32 chan);
 	void (*init_rx_chan)(void __iomem *ioaddr,
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index e433157..afb2739 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -2134,10 +2134,9 @@ static int stmmac_init_dma_engine(struct stmmac_priv *priv)
 {
 	u32 rx_channels_count = priv->plat->rx_queues_to_use;
 	u32 tx_channels_count = priv->plat->tx_queues_to_use;
+	u32 dma_csr_ch = max(rx_channels_count, tx_channels_count);
 	struct stmmac_rx_queue *rx_q;
 	struct stmmac_tx_queue *tx_q;
-	u32 dummy_dma_rx_phy = 0;
-	u32 dummy_dma_tx_phy = 0;
 	u32 chan = 0;
 	int atds = 0;
 	int ret = 0;
@@ -2156,48 +2155,39 @@ static int stmmac_init_dma_engine(struct stmmac_priv *priv)
 		return ret;
 	}
 
-	if (priv->synopsys_id >= DWMAC_CORE_4_00) {
-		/* DMA Configuration */
-		stmmac_dma_init(priv, priv->ioaddr, priv->plat->dma_cfg,
-				dummy_dma_tx_phy, dummy_dma_rx_phy, atds);
-
-		/* DMA RX Channel Configuration */
-		for (chan = 0; chan < rx_channels_count; chan++) {
-			rx_q = &priv->rx_queue[chan];
-
-			stmmac_init_rx_chan(priv, priv->ioaddr,
-					priv->plat->dma_cfg, rx_q->dma_rx_phy,
-					chan);
-
-			rx_q->rx_tail_addr = rx_q->dma_rx_phy +
-				    (DMA_RX_SIZE * sizeof(struct dma_desc));
-			stmmac_set_rx_tail_ptr(priv, priv->ioaddr,
-					rx_q->rx_tail_addr, chan);
-		}
+	/* DMA Configuration */
+	stmmac_dma_init(priv, priv->ioaddr, priv->plat->dma_cfg, atds);
 
-		/* DMA TX Channel Configuration */
-		for (chan = 0; chan < tx_channels_count; chan++) {
-			tx_q = &priv->tx_queue[chan];
+	/* DMA RX Channel Configuration */
+	for (chan = 0; chan < rx_channels_count; chan++) {
+		rx_q = &priv->rx_queue[chan];
 
-			stmmac_init_chan(priv, priv->ioaddr,
-					priv->plat->dma_cfg, chan);
+		stmmac_init_rx_chan(priv, priv->ioaddr, priv->plat->dma_cfg,
+				    rx_q->dma_rx_phy, chan);
 
-			stmmac_init_tx_chan(priv, priv->ioaddr,
-					priv->plat->dma_cfg, tx_q->dma_tx_phy,
-					chan);
+		rx_q->rx_tail_addr = rx_q->dma_rx_phy +
+			    (DMA_RX_SIZE * sizeof(struct dma_desc));
+		stmmac_set_rx_tail_ptr(priv, priv->ioaddr,
+				       rx_q->rx_tail_addr, chan);
+	}
 
-			tx_q->tx_tail_addr = tx_q->dma_tx_phy +
-				    (DMA_TX_SIZE * sizeof(struct dma_desc));
-			stmmac_set_tx_tail_ptr(priv, priv->ioaddr,
-					tx_q->tx_tail_addr, chan);
-		}
-	} else {
-		rx_q = &priv->rx_queue[chan];
+	/* DMA TX Channel Configuration */
+	for (chan = 0; chan < tx_channels_count; chan++) {
 		tx_q = &priv->tx_queue[chan];
-		stmmac_dma_init(priv, priv->ioaddr, priv->plat->dma_cfg,
-				tx_q->dma_tx_phy, rx_q->dma_rx_phy, atds);
+
+		stmmac_init_tx_chan(priv, priv->ioaddr, priv->plat->dma_cfg,
+				    tx_q->dma_tx_phy, chan);
+
+		tx_q->tx_tail_addr = tx_q->dma_tx_phy +
+			    (DMA_TX_SIZE * sizeof(struct dma_desc));
+		stmmac_set_tx_tail_ptr(priv, priv->ioaddr,
+				       tx_q->tx_tail_addr, chan);
 	}
 
+	/* DMA CSR Channel configuration */
+	for (chan = 0; chan < dma_csr_ch; chan++)
+		stmmac_init_chan(priv, priv->ioaddr, priv->plat->dma_cfg, chan);
+
 	if (priv->plat->axi)
 		stmmac_axi(priv, priv->ioaddr, priv->plat->axi);
 
-- 
1.7.1

[PATCH net-next 07/10] net: stmmac: Remove uneeded check for GMAC version in stmmac_xmit

[Jose Abreu]

We either have .enable_dma_transmission or .set_tx_tail_ptr in the HW
table callbacks, we can never have both so there is no need to check for
GMAC version.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Joao Pinto <jpinto@synopsys.com>
Cc: Vitor Soares <soares@synopsys.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.h  |    1 -
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |    7 ++-----
 2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.h b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.h
index 8474bf9..c63c1fe 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.h
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.h
@@ -184,7 +184,6 @@
 #define DMA_CHAN0_DBG_STAT_RPS_SHIFT	8
 
 int dwmac4_dma_reset(void __iomem *ioaddr);
-void dwmac4_enable_dma_transmission(void __iomem *ioaddr, u32 tail_ptr);
 void dwmac4_enable_dma_irq(void __iomem *ioaddr, u32 chan);
 void dwmac410_enable_dma_irq(void __iomem *ioaddr, u32 chan);
 void dwmac4_disable_dma_irq(void __iomem *ioaddr, u32 chan);
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index afb2739..c5769b4 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3159,11 +3159,8 @@ static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	netdev_tx_sent_queue(netdev_get_tx_queue(dev, queue), skb->len);
 
-	if (priv->synopsys_id < DWMAC_CORE_4_00)
-		stmmac_enable_dma_transmission(priv, priv->ioaddr);
-	else
-		stmmac_set_tx_tail_ptr(priv, priv->ioaddr, tx_q->tx_tail_addr,
-				queue);
+	stmmac_enable_dma_transmission(priv, priv->ioaddr);
+	stmmac_set_tx_tail_ptr(priv, priv->ioaddr, tx_q->tx_tail_addr, queue);
 
 	return NETDEV_TX_OK;
 
-- 
1.7.1

[PATCH net-next 08/10] net: stmmac: Do not initialize the RX Descriptor twice

[Jose Abreu]

The RX Descriptor is already initialized in at setup phase so there is
no need to set the values again, we just need to set the owner. This
allow us to remove another if condition.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Joao Pinto <jpinto@synopsys.com>
Cc: Vitor Soares <soares@synopsys.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |    5 +----
 1 files changed, 1 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index c5769b4..80439be 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3255,10 +3255,7 @@ static inline void stmmac_rx_refill(struct stmmac_priv *priv, u32 queue)
 		}
 		dma_wmb();
 
-		if (unlikely(priv->synopsys_id >= DWMAC_CORE_4_00))
-			stmmac_init_rx_desc(priv, p, priv->use_riwt, 0, 0);
-		else
-			stmmac_set_rx_owner(priv, p);
+		stmmac_set_rx_owner(priv, p);
 
 		dma_wmb();
 
-- 
1.7.1

[PATCH net-next 09/10] net: stmmac: Let descriptor code get skbuff address

[Jose Abreu]

Stop using if conditions depending on the GMAC version for getting the
descriptor skbuff address and use instead a helper implemented in the
descriptor files.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Joao Pinto <jpinto@synopsys.com>
Cc: Vitor Soares <soares@synopsys.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c |    6 ++++++
 drivers/net/ethernet/stmicro/stmmac/enh_desc.c     |    6 ++++++
 drivers/net/ethernet/stmicro/stmmac/hwif.h         |    4 ++++
 drivers/net/ethernet/stmicro/stmmac/norm_desc.c    |    6 ++++++
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  |    6 +-----
 5 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
index 119a2f9..7f09496 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_descs.c
@@ -424,6 +424,11 @@ static void dwmac4_set_mss_ctxt(struct dma_desc *p, unsigned int mss)
 	p->des3 = cpu_to_le32(TDES3_CONTEXT_TYPE | TDES3_CTXT_TCMSSV);
 }
 
+static void dwmac4_get_addr(struct dma_desc *p, unsigned int *addr)
+{
+	*addr = le32_to_cpu(p->des0);
+}
+
 static void dwmac4_set_addr(struct dma_desc *p, dma_addr_t addr)
 {
 	p->des0 = cpu_to_le32(addr);
@@ -459,6 +464,7 @@ static void dwmac4_clear(struct dma_desc *p)
 	.init_tx_desc = dwmac4_rd_init_tx_desc,
 	.display_ring = dwmac4_display_ring,
 	.set_mss = dwmac4_set_mss_ctxt,
+	.get_addr = dwmac4_get_addr,
 	.set_addr = dwmac4_set_addr,
 	.clear = dwmac4_clear,
 };
diff --git a/drivers/net/ethernet/stmicro/stmmac/enh_desc.c b/drivers/net/ethernet/stmicro/stmmac/enh_desc.c
index 17cd26f..7eb740c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/enh_desc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/enh_desc.c
@@ -437,6 +437,11 @@ static void enh_desc_display_ring(void *head, unsigned int size, bool rx)
 	pr_info("\n");
 }
 
+static void enh_desc_get_addr(struct dma_desc *p, unsigned int *addr)
+{
+	*addr = le32_to_cpu(p->des2);
+}
+
 static void enh_desc_set_addr(struct dma_desc *p, dma_addr_t addr)
 {
 	p->des2 = cpu_to_le32(addr);
@@ -467,6 +472,7 @@ static void enh_desc_clear(struct dma_desc *p)
 	.get_timestamp = enh_desc_get_timestamp,
 	.get_rx_timestamp_status = enh_desc_get_rx_timestamp_status,
 	.display_ring = enh_desc_display_ring,
+	.get_addr = enh_desc_get_addr,
 	.set_addr = enh_desc_set_addr,
 	.clear = enh_desc_clear,
 };
diff --git a/drivers/net/ethernet/stmicro/stmmac/hwif.h b/drivers/net/ethernet/stmicro/stmmac/hwif.h
index 1c674d6..4f9f08d 100644
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.h
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h
@@ -79,6 +79,8 @@ struct stmmac_desc_ops {
 	void (*display_ring)(void *head, unsigned int size, bool rx);
 	/* set MSS via context descriptor */
 	void (*set_mss)(struct dma_desc *p, unsigned int mss);
+	/* get descriptor skbuff address */
+	void (*get_addr)(struct dma_desc *p, unsigned int *addr);
 	/* set descriptor skbuff address */
 	void (*set_addr)(struct dma_desc *p, dma_addr_t addr);
 	/* clear descriptor */
@@ -127,6 +129,8 @@ struct stmmac_desc_ops {
 	stmmac_do_void_callback(__priv, desc, display_ring, __args)
 #define stmmac_set_mss(__priv, __args...) \
 	stmmac_do_void_callback(__priv, desc, set_mss, __args)
+#define stmmac_get_desc_addr(__priv, __args...) \
+	stmmac_do_void_callback(__priv, desc, get_addr, __args)
 #define stmmac_set_desc_addr(__priv, __args...) \
 	stmmac_do_void_callback(__priv, desc, set_addr, __args)
 #define stmmac_clear_desc(__priv, __args...) \
diff --git a/drivers/net/ethernet/stmicro/stmmac/norm_desc.c b/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
index a7b221b..220e345 100644
--- a/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
+++ b/drivers/net/ethernet/stmicro/stmmac/norm_desc.c
@@ -297,6 +297,11 @@ static void ndesc_display_ring(void *head, unsigned int size, bool rx)
 	pr_info("\n");
 }
 
+static void ndesc_get_addr(struct dma_desc *p, unsigned int *addr)
+{
+	*addr = le32_to_cpu(p->des2);
+}
+
 static void ndesc_set_addr(struct dma_desc *p, dma_addr_t addr)
 {
 	p->des2 = cpu_to_le32(addr);
@@ -326,6 +331,7 @@ static void ndesc_clear(struct dma_desc *p)
 	.get_timestamp = ndesc_get_timestamp,
 	.get_rx_timestamp_status = ndesc_get_rx_timestamp_status,
 	.display_ring = ndesc_display_ring,
+	.get_addr = ndesc_get_addr,
 	.set_addr = ndesc_set_addr,
 	.clear = ndesc_clear,
 };
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 80439be..7bfe18c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3343,11 +3343,7 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue)
 			int frame_len;
 			unsigned int des;
 
-			if (unlikely(priv->synopsys_id >= DWMAC_CORE_4_00))
-				des = le32_to_cpu(p->des0);
-			else
-				des = le32_to_cpu(p->des2);
-
+			stmmac_get_desc_addr(priv, p, &des);
 			frame_len = stmmac_get_rx_frame_len(priv, p, coe);
 
 			/*  If frame length is greater than skb buffer size
-- 
1.7.1

[PATCH net-next 10/10] net: stmmac: Remove if condition by taking advantage of hwif return code

[Jose Abreu]

We can remove the if condition and check if return code is different
than -EINVAL, meaning callback is present.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Joao Pinto <jpinto@synopsys.com>
Cc: Vitor Soares <soares@synopsys.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |   23 ++++++++++-----------
 1 files changed, 11 insertions(+), 12 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 7bfe18c..451de6b 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3637,6 +3637,7 @@ static irqreturn_t stmmac_interrupt(int irq, void *dev_id)
 	/* To handle GMAC own interrupts */
 	if ((priv->plat->has_gmac) || (priv->plat->has_gmac4)) {
 		int status = stmmac_host_irq_status(priv, priv->hw, &priv->xstats);
+		int mtl_status;
 
 		if (unlikely(status)) {
 			/* For LPI we need to save the tx status */
@@ -3646,20 +3647,18 @@ static irqreturn_t stmmac_interrupt(int irq, void *dev_id)
 				priv->tx_path_in_lpi_mode = false;
 		}
 
-		if (priv->synopsys_id >= DWMAC_CORE_4_00) {
-			for (queue = 0; queue < queues_count; queue++) {
-				struct stmmac_rx_queue *rx_q =
-				&priv->rx_queue[queue];
+		for (queue = 0; queue < queues_count; queue++) {
+			struct stmmac_rx_queue *rx_q = &priv->rx_queue[queue];
 
-				status |= stmmac_host_mtl_irq_status(priv,
-						priv->hw, queue);
+			mtl_status = stmmac_host_mtl_irq_status(priv, priv->hw,
+								queue);
+			if (mtl_status != -EINVAL)
+				status |= mtl_status;
 
-				if (status & CORE_IRQ_MTL_RX_OVERFLOW)
-					stmmac_set_rx_tail_ptr(priv,
-							priv->ioaddr,
-							rx_q->rx_tail_addr,
-							queue);
-			}
+			if (status & CORE_IRQ_MTL_RX_OVERFLOW)
+				stmmac_set_rx_tail_ptr(priv, priv->ioaddr,
+						       rx_q->rx_tail_addr,
+						       queue);
 		}
 
 		/* PCS link status */
-- 
1.7.1

Re: [PATCH net-next 08/10] net: stmmac: Do not initialize the RX Descriptor twice

[Jose Abreu]

On 08-05-2018 15:45, Jose Abreu wrote:
> The RX Descriptor is already initialized in at setup phase so there is
> no need to set the values again, we just need to set the owner. This
> allow us to remove another if condition.
>
> Signed-off-by: Jose Abreu <joabreu@synopsys.com>
> Cc: David S. Miller <davem@davemloft.net>
> Cc: Joao Pinto <jpinto@synopsys.com>
> Cc: Vitor Soares <soares@synopsys.com>
> Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
> Cc: Alexandre Torgue <alexandre.torgue@st.com>
> ---
>  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |    5 +----
>  1 files changed, 1 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index c5769b4..80439be 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -3255,10 +3255,7 @@ static inline void stmmac_rx_refill(struct stmmac_priv *priv, u32 queue)
>  		}
>  		dma_wmb();
>  
> -		if (unlikely(priv->synopsys_id >= DWMAC_CORE_4_00))
> -			stmmac_init_rx_desc(priv, p, priv->use_riwt, 0, 0);

This cant be removed. Please don't merge it.

Thanks and Best Regards,
Jose Miguel Abreu

> -		else
> -			stmmac_set_rx_owner(priv, p);
> +		stmmac_set_rx_owner(priv, p);
>  
>  		dma_wmb();
>  

Re: [PATCH net-next 01/10] net: stmmac: Let descriptor code set skbuff address

[David Miller]

From: Jose Abreu <Jose.Abreu@synopsys.com>
Date: Tue,  8 May 2018 15:45:24 +0100

> Stop using if conditions depending on the GMAC version for setting the
> the descriptor skbuff address and use instead a helper implemented in
> the descriptor files.
> 
> Signed-off-by: Jose Abreu <joabreu@synopsys.com>

With Spectre mitigations, indirect calls are extremely expensive.  Much
more expensive than conditional checks.

And since this is the descriptor setup in the fast paths of the driver,
I advise that you keep these conditionals.

Re: [PATCH net-next 00/10] net: stmmac: Be less dependent on Synopsys ID

[David Miller]

From: Jose Abreu <Jose.Abreu@synopsys.com>
Date: Tue,  8 May 2018 15:45:23 +0100

> This series was based on top of [1]. Please see my reply on [1] and let me
> know if I need to rebase against -next without this dependecy.
 ...
> [1] https://patchwork.ozlabs.org/patch/908618/

V1 of that patch is what ended up in my tree before you even posted
V2.  So if you have to update to what's in V2 you must send in a
relative patch against net-next to fix it up.

Thank you.

Re: [PATCH net-next 01/10] net: stmmac: Let descriptor code set skbuff address

[Jose Abreu]

On 10-05-2018 20:06, David Miller wrote:
> From: Jose Abreu <Jose.Abreu@synopsys.com>
> Date: Tue,  8 May 2018 15:45:24 +0100
>
>> Stop using if conditions depending on the GMAC version for setting the
>> the descriptor skbuff address and use instead a helper implemented in
>> the descriptor files.
>>
>> Signed-off-by: Jose Abreu <joabreu@synopsys.com>
> With Spectre mitigations, indirect calls are extremely expensive.  Much
> more expensive than conditional checks.
>
> And since this is the descriptor setup in the fast paths of the driver,

Hmm, no. This is only done in HW setup. The only patch in this
series that can impact performance because of what you mentioned
is 09.

> I advise that you keep these conditionals.

I see your point but I'm trying to make the code more flexible
because we will add support for XGMAC soon. This XGMAC will need
a similar structure to what we have in GMAC.

By removing this conditionals we make stmmac_main totally
agnostic of HW and we will prevent patterns like this in the future:

if (priv->has_xgmac)
    do_stuff()
else if (priv->synopsys_id > GMAC_SOME_VERSION)
    do_other_stuff()
else
    do_other_other_stuff()

Thanks and Best Regards,
Jose Miguel Abreu