[PATCH 0/5] sh_eth: clean up the TSU register accessors

[PATCH 0/5] sh_eth: clean up the TSU register accessors

[Sergei Shtylyov]

Hello!

Here's a set of 5 patches against DaveM's 'net-next.git' repo. They do a final
clean up of the TSU register accessors...

[1/1] sh_eth: uninline sh_eth_tsu_get_offset()
[2/3] sh_eth: make sh_eth_tsu_get_offset() match its name
[3/3] sh_eth: call sh_eth_tsu_get_offset() from TSU register accessors
[4/5] sh_eth: make sh_eth_tsu_write_entry() take 'offset' parameter
[5/5] sh_eth: make sh_eth_tsu_{read|write}_entry() prototypes symmetric

MBR, Sergei

[PATCH 1/5] sh_eth: uninline sh_eth_tsu_get_offset()

[Sergei Shtylyov]

sh_eth_tsu_get_offset() is called several  times  by the driver, remove
*inline* and move  that function  from the header to the driver  itself
to let gcc decide  whether to expand it inline or not...

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

---
 drivers/net/ethernet/renesas/sh_eth.c |    5 +++++
 drivers/net/ethernet/renesas/sh_eth.h |    6 ------
 2 files changed, 5 insertions(+), 6 deletions(-)

Index: net-next/drivers/net/ethernet/renesas/sh_eth.c
===================================================================
--- net-next.orig/drivers/net/ethernet/renesas/sh_eth.c
+++ net-next/drivers/net/ethernet/renesas/sh_eth.c
@@ -439,6 +439,11 @@ static void sh_eth_modify(struct net_dev
 		     enum_index);
 }
 
+static void *sh_eth_tsu_get_offset(struct sh_eth_private *mdp, int enum_index)
+{
+	return mdp->tsu_addr + mdp->reg_offset[enum_index];
+}
+
 static void sh_eth_tsu_write(struct sh_eth_private *mdp, u32 data,
 			     int enum_index)
 {
Index: net-next/drivers/net/ethernet/renesas/sh_eth.h
===================================================================
--- net-next.orig/drivers/net/ethernet/renesas/sh_eth.h
+++ net-next/drivers/net/ethernet/renesas/sh_eth.h
@@ -558,10 +558,4 @@ struct sh_eth_private {
 	unsigned wol_enabled:1;
 };
 
-static inline void *sh_eth_tsu_get_offset(struct sh_eth_private *mdp,
-					  int enum_index)
-{
-	return mdp->tsu_addr + mdp->reg_offset[enum_index];
-}
-
 #endif	/* #ifndef __SH_ETH_H__ */

[PATCH 2/5] sh_eth: make sh_eth_tsu_get_offset() match its name

[Sergei Shtylyov]

sh_eth_tsu_get_offset(), despite its name, returns a TSU register's address,
not its offset.  Make this  function match its name and return a register's
offset  from the TSU  registers base address instead.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

---
 drivers/net/ethernet/renesas/sh_eth.c |   24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

Index: net-next/drivers/net/ethernet/renesas/sh_eth.c
===================================================================
--- net-next.orig/drivers/net/ethernet/renesas/sh_eth.c
+++ net-next/drivers/net/ethernet/renesas/sh_eth.c
@@ -439,9 +439,9 @@ static void sh_eth_modify(struct net_dev
 		     enum_index);
 }
 
-static void *sh_eth_tsu_get_offset(struct sh_eth_private *mdp, int enum_index)
+static u16 sh_eth_tsu_get_offset(struct sh_eth_private *mdp, int enum_index)
 {
-	return mdp->tsu_addr + mdp->reg_offset[enum_index];
+	return mdp->reg_offset[enum_index];
 }
 
 static void sh_eth_tsu_write(struct sh_eth_private *mdp, u32 data,
@@ -2712,12 +2712,12 @@ static void sh_eth_tsu_read_entry(void *
 static int sh_eth_tsu_find_entry(struct net_device *ndev, const u8 *addr)
 {
 	struct sh_eth_private *mdp = netdev_priv(ndev);
-	void *reg_offset = sh_eth_tsu_get_offset(mdp, TSU_ADRH0);
+	u16 reg_offset = sh_eth_tsu_get_offset(mdp, TSU_ADRH0);
 	int i;
 	u8 c_addr[ETH_ALEN];
 
 	for (i = 0; i < SH_ETH_TSU_CAM_ENTRIES; i++, reg_offset += 8) {
-		sh_eth_tsu_read_entry(reg_offset, c_addr);
+		sh_eth_tsu_read_entry(mdp->tsu_addr + reg_offset, c_addr);
 		if (ether_addr_equal(addr, c_addr))
 			return i;
 	}
@@ -2739,7 +2739,7 @@ static int sh_eth_tsu_disable_cam_entry_
 					      int entry)
 {
 	struct sh_eth_private *mdp = netdev_priv(ndev);
-	void *reg_offset = sh_eth_tsu_get_offset(mdp, TSU_ADRH0);
+	u16 reg_offset = sh_eth_tsu_get_offset(mdp, TSU_ADRH0);
 	int ret;
 	u8 blank[ETH_ALEN];
 
@@ -2747,7 +2747,9 @@ static int sh_eth_tsu_disable_cam_entry_
 			 ~(1 << (31 - entry)), TSU_TEN);
 
 	memset(blank, 0, sizeof(blank));
-	ret = sh_eth_tsu_write_entry(ndev, reg_offset + entry * 8, blank);
+	ret = sh_eth_tsu_write_entry(ndev,
+				     mdp->tsu_addr + reg_offset + entry * 8,
+				     blank);
 	if (ret < 0)
 		return ret;
 	return 0;
@@ -2756,7 +2758,7 @@ static int sh_eth_tsu_disable_cam_entry_
 static int sh_eth_tsu_add_entry(struct net_device *ndev, const u8 *addr)
 {
 	struct sh_eth_private *mdp = netdev_priv(ndev);
-	void *reg_offset = sh_eth_tsu_get_offset(mdp, TSU_ADRH0);
+	u16 reg_offset = sh_eth_tsu_get_offset(mdp, TSU_ADRH0);
 	int i, ret;
 
 	if (!mdp->cd->tsu)
@@ -2768,7 +2770,9 @@ static int sh_eth_tsu_add_entry(struct n
 		i = sh_eth_tsu_find_empty(ndev);
 		if (i < 0)
 			return -ENOMEM;
-		ret = sh_eth_tsu_write_entry(ndev, reg_offset + i * 8, addr);
+		ret = sh_eth_tsu_write_entry(ndev,
+					     mdp->tsu_addr + reg_offset + i * 8,
+					     addr);
 		if (ret < 0)
 			return ret;
 
@@ -2830,15 +2834,15 @@ static int sh_eth_tsu_purge_all(struct n
 static void sh_eth_tsu_purge_mcast(struct net_device *ndev)
 {
 	struct sh_eth_private *mdp = netdev_priv(ndev);
+	u16 reg_offset = sh_eth_tsu_get_offset(mdp, TSU_ADRH0);
 	u8 addr[ETH_ALEN];
-	void *reg_offset = sh_eth_tsu_get_offset(mdp, TSU_ADRH0);
 	int i;
 
 	if (!mdp->cd->tsu)
 		return;
 
 	for (i = 0; i < SH_ETH_TSU_CAM_ENTRIES; i++, reg_offset += 8) {
-		sh_eth_tsu_read_entry(reg_offset, addr);
+		sh_eth_tsu_read_entry(mdp->tsu_addr + reg_offset, addr);
 		if (is_multicast_ether_addr(addr))
 			sh_eth_tsu_del_entry(ndev, addr);
 	}

[PATCH 3/5] sh_eth: call sh_eth_tsu_get_offset() from TSU register accessors

[Sergei Shtylyov]

With sh_eth_tsu_get_offset() now actually returning TSU register's offset,
we  can at last use it in sh_eth_tsu_{read|write}(). Somehow this saves 248
bytes of object code with AArch64 gcc 4.8.5... :-)

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

---
 drivers/net/ethernet/renesas/sh_eth.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: net-next/drivers/net/ethernet/renesas/sh_eth.c
===================================================================
--- net-next.orig/drivers/net/ethernet/renesas/sh_eth.c
+++ net-next/drivers/net/ethernet/renesas/sh_eth.c
@@ -447,7 +447,7 @@ static u16 sh_eth_tsu_get_offset(struct
 static void sh_eth_tsu_write(struct sh_eth_private *mdp, u32 data,
 			     int enum_index)
 {
-	u16 offset = mdp->reg_offset[enum_index];
+	u16 offset = sh_eth_tsu_get_offset(mdp, enum_index);
 
 	if (WARN_ON(offset == SH_ETH_OFFSET_INVALID))
 		return;
@@ -457,7 +457,7 @@ static void sh_eth_tsu_write(struct sh_e
 
 static u32 sh_eth_tsu_read(struct sh_eth_private *mdp, int enum_index)
 {
-	u16 offset = mdp->reg_offset[enum_index];
+	u16 offset = sh_eth_tsu_get_offset(mdp, enum_index);
 
 	if (WARN_ON(offset == SH_ETH_OFFSET_INVALID))
 		return ~0U;

[PATCH 4/5] sh_eth: make sh_eth_tsu_write_entry() take 'offset' parameter

[Sergei Shtylyov]

We can add the TSU register base address to a TSU register offset right
in sh_eth_tsu_write_entry(),  no need to do it in its callers...

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

---
 drivers/net/ethernet/renesas/sh_eth.c |   15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

Index: net-next/drivers/net/ethernet/renesas/sh_eth.c
===================================================================
--- net-next.orig/drivers/net/ethernet/renesas/sh_eth.c
+++ net-next/drivers/net/ethernet/renesas/sh_eth.c
@@ -2676,18 +2676,19 @@ static int sh_eth_tsu_busy(struct net_de
 	return 0;
 }
 
-static int sh_eth_tsu_write_entry(struct net_device *ndev, void *reg,
+static int sh_eth_tsu_write_entry(struct net_device *ndev, u16 offset,
 				  const u8 *addr)
 {
+	struct sh_eth_private *mdp = netdev_priv(ndev);
 	u32 val;
 
 	val = addr[0] << 24 | addr[1] << 16 | addr[2] << 8 | addr[3];
-	iowrite32(val, reg);
+	iowrite32(val, mdp->tsu_addr + offset);
 	if (sh_eth_tsu_busy(ndev) < 0)
 		return -EBUSY;
 
 	val = addr[4] << 8 | addr[5];
-	iowrite32(val, reg + 4);
+	iowrite32(val, mdp->tsu_addr + offset + 4);
 	if (sh_eth_tsu_busy(ndev) < 0)
 		return -EBUSY;
 
@@ -2747,9 +2748,7 @@ static int sh_eth_tsu_disable_cam_entry_
 			 ~(1 << (31 - entry)), TSU_TEN);
 
 	memset(blank, 0, sizeof(blank));
-	ret = sh_eth_tsu_write_entry(ndev,
-				     mdp->tsu_addr + reg_offset + entry * 8,
-				     blank);
+	ret = sh_eth_tsu_write_entry(ndev, reg_offset + entry * 8, blank);
 	if (ret < 0)
 		return ret;
 	return 0;
@@ -2770,9 +2769,7 @@ static int sh_eth_tsu_add_entry(struct n
 		i = sh_eth_tsu_find_empty(ndev);
 		if (i < 0)
 			return -ENOMEM;
-		ret = sh_eth_tsu_write_entry(ndev,
-					     mdp->tsu_addr + reg_offset + i * 8,
-					     addr);
+		ret = sh_eth_tsu_write_entry(ndev, reg_offset + i * 8, addr);
 		if (ret < 0)
 			return ret;
 

[PATCH 5/5] sh_eth: make sh_eth_tsu_{read|write}_entry() prototypes symmetric

[Sergei Shtylyov]

sh_eth_tsu_read_entry() is still asymmetric with sh_eth_tsu_write_entry()
WRT their prototypes -- make them symmetric by passing to the former a TSU
register offset instead of its address and also adding the (now necessary)
'ndev' parameter...

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

---
 drivers/net/ethernet/renesas/sh_eth.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

Index: net-next/drivers/net/ethernet/renesas/sh_eth.c
===================================================================
--- net-next.orig/drivers/net/ethernet/renesas/sh_eth.c
+++ net-next/drivers/net/ethernet/renesas/sh_eth.c
@@ -2695,16 +2695,17 @@ static int sh_eth_tsu_write_entry(struct
 	return 0;
 }
 
-static void sh_eth_tsu_read_entry(void *reg, u8 *addr)
+static void sh_eth_tsu_read_entry(struct net_device *ndev, u16 offset, u8 *addr)
 {
+	struct sh_eth_private *mdp = netdev_priv(ndev);
 	u32 val;
 
-	val = ioread32(reg);
+	val = ioread32(mdp->tsu_addr + offset);
 	addr[0] = (val >> 24) & 0xff;
 	addr[1] = (val >> 16) & 0xff;
 	addr[2] = (val >> 8) & 0xff;
 	addr[3] = val & 0xff;
-	val = ioread32(reg + 4);
+	val = ioread32(mdp->tsu_addr + offset + 4);
 	addr[4] = (val >> 8) & 0xff;
 	addr[5] = val & 0xff;
 }
@@ -2718,7 +2719,7 @@ static int sh_eth_tsu_find_entry(struct
 	u8 c_addr[ETH_ALEN];
 
 	for (i = 0; i < SH_ETH_TSU_CAM_ENTRIES; i++, reg_offset += 8) {
-		sh_eth_tsu_read_entry(mdp->tsu_addr + reg_offset, c_addr);
+		sh_eth_tsu_read_entry(ndev, reg_offset, c_addr);
 		if (ether_addr_equal(addr, c_addr))
 			return i;
 	}
@@ -2839,7 +2840,7 @@ static void sh_eth_tsu_purge_mcast(struc
 		return;
 
 	for (i = 0; i < SH_ETH_TSU_CAM_ENTRIES; i++, reg_offset += 8) {
-		sh_eth_tsu_read_entry(mdp->tsu_addr + reg_offset, addr);
+		sh_eth_tsu_read_entry(ndev, reg_offset, addr);
 		if (is_multicast_ether_addr(addr))
 			sh_eth_tsu_del_entry(ndev, addr);
 	}

Re: [PATCH 0/5] sh_eth: clean up the TSU register accessors

[David Miller]

From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Date: Mon, 23 Jul 2018 21:08:31 +0300

> Here's a set of 5 patches against DaveM's 'net-next.git' repo. They
> do a final clean up of the TSU register accessors...

Series applied, thanks Sergei.

Re: [PATCH 1/5] sh_eth: uninline sh_eth_tsu_get_offset()

[Geert Uytterhoeven]

On Mon, Jul 23, 2018 at 8:10 PM Sergei Shtylyov
<sergei.shtylyov@cogentembedded.com> wrote:
> sh_eth_tsu_get_offset() is called several  times  by the driver, remove
> *inline* and move  that function  from the header to the driver  itself
> to let gcc decide  whether to expand it inline or not...
>
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH 2/5] sh_eth: make sh_eth_tsu_get_offset() match its name

[Geert Uytterhoeven]

On Mon, Jul 23, 2018 at 8:11 PM Sergei Shtylyov
<sergei.shtylyov@cogentembedded.com> wrote:
> sh_eth_tsu_get_offset(), despite its name, returns a TSU register's address,
> not its offset.  Make this  function match its name and return a register's
> offset  from the TSU  registers base address instead.
>
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH 3/5] sh_eth: call sh_eth_tsu_get_offset() from TSU register accessors

[Geert Uytterhoeven]

Hi Sergei,

On Mon, Jul 23, 2018 at 8:13 PM Sergei Shtylyov
<sergei.shtylyov@cogentembedded.com> wrote:
> With sh_eth_tsu_get_offset() now actually returning TSU register's offset,
> we  can at last use it in sh_eth_tsu_{read|write}(). Somehow this saves 248
> bytes of object code with AArch64 gcc 4.8.5... :-)

Adding two more users may be the trigger for gcc not to inline the
function anymore?

> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH 4/5] sh_eth: make sh_eth_tsu_write_entry() take 'offset' parameter

[Geert Uytterhoeven]

On Mon, Jul 23, 2018 at 8:15 PM Sergei Shtylyov
<sergei.shtylyov@cogentembedded.com> wrote:
> We can add the TSU register base address to a TSU register offset right
> in sh_eth_tsu_write_entry(),  no need to do it in its callers...
>
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH 5/5] sh_eth: make sh_eth_tsu_{read|write}_entry() prototypes symmetric

[Geert Uytterhoeven]

On Mon, Jul 23, 2018 at 8:16 PM Sergei Shtylyov
<sergei.shtylyov@cogentembedded.com> wrote:
> sh_eth_tsu_read_entry() is still asymmetric with sh_eth_tsu_write_entry()
> WRT their prototypes -- make them symmetric by passing to the former a TSU
> register offset instead of its address and also adding the (now necessary)
> 'ndev' parameter...
>
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds