[PATCH net-next v1 0/8] net: dsa: microchip: ksz8: refactor FDB dump path

[PATCH net-next v1 0/8] net: dsa: microchip: ksz8: refactor FDB dump path

[Oleksij Rempel]

Refactor FDB dump code path for Microchip KSZ8xxx series. This series
mostly makes some cosmetic reworks and allows to forward errors detected
by the regmap.

Oleksij Rempel (8):
  net: dsa: microchip: Remove unused FDB timestamp support in
    ksz8_r_dyn_mac_table()
  net: dsa: microchip: Make ksz8_r_dyn_mac_table() static
  net: dsa: microchip: ksz8: Refactor ksz8_fdb_dump()
  net: dsa: microchip: ksz8: Refactor ksz8_r_dyn_mac_table() for
    readability
  net: dsa: microchip: ksz8: Unify variable naming in
    ksz8_r_dyn_mac_table()
  net: dsa: microchip: ksz8_r_dyn_mac_table(): ksz: do not return EAGAIN
    on timeout
  net: dsa: microchip: ksz8_r_dyn_mac_table(): return read/write error
    if we got any
  net: dsa: microchip: ksz8_r_dyn_mac_table(): use entries variable to
    signal 0 entries

 drivers/net/dsa/microchip/ksz8.h        |   2 -
 drivers/net/dsa/microchip/ksz8795.c     | 144 ++++++++++++------------
 drivers/net/dsa/microchip/ksz8795_reg.h |   1 +
 3 files changed, 75 insertions(+), 72 deletions(-)

-- 
2.39.2

[PATCH net-next v1 1/8] net: dsa: microchip: Remove unused FDB timestamp support in ksz8_r_dyn_mac_table()

[Oleksij Rempel]

The FDB timestamps are not being utilized. This commit removes the
unused timestamp support from ksz8_r_dyn_mac_table() function.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 drivers/net/dsa/microchip/ksz8.h    | 2 +-
 drivers/net/dsa/microchip/ksz8795.c | 7 ++-----
 2 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz8.h b/drivers/net/dsa/microchip/ksz8.h
index 1a5225264e6a3..5b38cbb7b058b 100644
--- a/drivers/net/dsa/microchip/ksz8.h
+++ b/drivers/net/dsa/microchip/ksz8.h
@@ -20,7 +20,7 @@ void ksz8_port_setup(struct ksz_device *dev, int port, bool cpu_port);
 int ksz8_r_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 *val);
 int ksz8_w_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 val);
 int ksz8_r_dyn_mac_table(struct ksz_device *dev, u16 addr, u8 *mac_addr,
-			 u8 *fid, u8 *src_port, u8 *timestamp, u16 *entries);
+			 u8 *fid, u8 *src_port, u16 *entries);
 void ksz8_r_mib_cnt(struct ksz_device *dev, int port, u16 addr, u64 *cnt);
 void ksz8_r_mib_pkt(struct ksz_device *dev, int port, u16 addr,
 		    u64 *dropped, u64 *cnt);
diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
index 14923535ca7e8..f59a03e6981d2 100644
--- a/drivers/net/dsa/microchip/ksz8795.c
+++ b/drivers/net/dsa/microchip/ksz8795.c
@@ -409,7 +409,7 @@ static int ksz8_valid_dyn_entry(struct ksz_device *dev, u8 *data)
 }
 
 int ksz8_r_dyn_mac_table(struct ksz_device *dev, u16 addr, u8 *mac_addr,
-			 u8 *fid, u8 *src_port, u8 *timestamp, u16 *entries)
+			 u8 *fid, u8 *src_port, u16 *entries)
 {
 	u32 data_hi, data_lo;
 	const u8 *shifts;
@@ -454,8 +454,6 @@ int ksz8_r_dyn_mac_table(struct ksz_device *dev, u16 addr, u8 *mac_addr,
 			shifts[DYNAMIC_MAC_FID];
 		*src_port = (data_hi & masks[DYNAMIC_MAC_TABLE_SRC_PORT]) >>
 			shifts[DYNAMIC_MAC_SRC_PORT];
-		*timestamp = (data_hi & masks[DYNAMIC_MAC_TABLE_TIMESTAMP]) >>
-			shifts[DYNAMIC_MAC_TIMESTAMP];
 
 		mac_addr[5] = (u8)data_lo;
 		mac_addr[4] = (u8)(data_lo >> 8);
@@ -1196,14 +1194,13 @@ int ksz8_fdb_dump(struct ksz_device *dev, int port,
 	int ret = 0;
 	u16 i = 0;
 	u16 entries = 0;
-	u8 timestamp = 0;
 	u8 fid;
 	u8 src_port;
 	u8 mac[ETH_ALEN];
 
 	do {
 		ret = ksz8_r_dyn_mac_table(dev, i, mac, &fid, &src_port,
-					   &timestamp, &entries);
+					   &entries);
 		if (!ret && port == src_port) {
 			ret = cb(mac, fid, false, data);
 			if (ret)
-- 
2.39.2

Re: [PATCH net-next v1 1/8] net: dsa: microchip: Remove unused FDB timestamp support in ksz8_r_dyn_mac_table()

[Arun.Ramadoss]

Hi Oleksij,

On Tue, 2024-04-02 at 15:13 +0200, Oleksij Rempel wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
> know the content is safe
> 
> The FDB timestamps are not being utilized. This commit removes the
> unused timestamp support from ksz8_r_dyn_mac_table() function.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>

Acked-by: Arun Ramadoss <arun.ramadoss@microchip.com>

[PATCH net-next v1 2/8] net: dsa: microchip: Make ksz8_r_dyn_mac_table() static

[Oleksij Rempel]

ksz8_r_dyn_mac_table() is not used outside the source file. Make it
static.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 drivers/net/dsa/microchip/ksz8.h    | 2 --
 drivers/net/dsa/microchip/ksz8795.c | 4 ++--
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz8.h b/drivers/net/dsa/microchip/ksz8.h
index 5b38cbb7b058b..571c26ce71e47 100644
--- a/drivers/net/dsa/microchip/ksz8.h
+++ b/drivers/net/dsa/microchip/ksz8.h
@@ -19,8 +19,6 @@ void ksz8_flush_dyn_mac_table(struct ksz_device *dev, int port);
 void ksz8_port_setup(struct ksz_device *dev, int port, bool cpu_port);
 int ksz8_r_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 *val);
 int ksz8_w_phy(struct ksz_device *dev, u16 phy, u16 reg, u16 val);
-int ksz8_r_dyn_mac_table(struct ksz_device *dev, u16 addr, u8 *mac_addr,
-			 u8 *fid, u8 *src_port, u16 *entries);
 void ksz8_r_mib_cnt(struct ksz_device *dev, int port, u16 addr, u64 *cnt);
 void ksz8_r_mib_pkt(struct ksz_device *dev, int port, u16 addr,
 		    u64 *dropped, u64 *cnt);
diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
index f59a03e6981d2..e407111db6637 100644
--- a/drivers/net/dsa/microchip/ksz8795.c
+++ b/drivers/net/dsa/microchip/ksz8795.c
@@ -408,8 +408,8 @@ static int ksz8_valid_dyn_entry(struct ksz_device *dev, u8 *data)
 	return 0;
 }
 
-int ksz8_r_dyn_mac_table(struct ksz_device *dev, u16 addr, u8 *mac_addr,
-			 u8 *fid, u8 *src_port, u16 *entries)
+static int ksz8_r_dyn_mac_table(struct ksz_device *dev, u16 addr, u8 *mac_addr,
+				u8 *fid, u8 *src_port, u16 *entries)
 {
 	u32 data_hi, data_lo;
 	const u8 *shifts;
-- 
2.39.2

Re: [PATCH net-next v1 2/8] net: dsa: microchip: Make ksz8_r_dyn_mac_table() static

[Arun.Ramadoss]

On Tue, 2024-04-02 at 15:13 +0200, Oleksij Rempel wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
> know the content is safe
> 
> ksz8_r_dyn_mac_table() is not used outside the source file. Make it
> static.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>

Acked-by: Arun Ramadoss <arun.ramadoss@microchip.com>

[PATCH net-next v1 3/8] net: dsa: microchip: ksz8: Refactor ksz8_fdb_dump()

[Oleksij Rempel]

Refactor ksz8_fdb_dump() to address potential issues:
- Limit the number of iterations to avoid endless loops.
- Handle error codes returned by ksz8_r_dyn_mac_table(), with
  an exception for -ENXIO when no more dynamic entries are detected.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 drivers/net/dsa/microchip/ksz8795.c     | 38 ++++++++++++++-----------
 drivers/net/dsa/microchip/ksz8795_reg.h |  1 +
 2 files changed, 23 insertions(+), 16 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
index e407111db6637..b70aa2c0a85ec 100644
--- a/drivers/net/dsa/microchip/ksz8795.c
+++ b/drivers/net/dsa/microchip/ksz8795.c
@@ -1191,27 +1191,33 @@ void ksz8_flush_dyn_mac_table(struct ksz_device *dev, int port)
 int ksz8_fdb_dump(struct ksz_device *dev, int port,
 		  dsa_fdb_dump_cb_t *cb, void *data)
 {
-	int ret = 0;
-	u16 i = 0;
 	u16 entries = 0;
-	u8 fid;
-	u8 src_port;
-	u8 mac[ETH_ALEN];
+	int ret, i;
+
+	for (i = 0; i < KSZ8_DYN_MAC_ENTRIES; i++) {
+		u8 mac[ETH_ALEN];
+		u8 src_port;
+		u8 fid;
 
-	do {
 		ret = ksz8_r_dyn_mac_table(dev, i, mac, &fid, &src_port,
 					   &entries);
-		if (!ret && port == src_port) {
-			ret = cb(mac, fid, false, data);
-			if (ret)
-				break;
-		}
-		i++;
-	} while (i < entries);
-	if (i >= entries)
-		ret = 0;
+		if (ret == -ENXIO)
+			return 0;
+		if (ret)
+			return ret;
 
-	return ret;
+		if (i >= entries)
+			return 0;
+
+		if (port != src_port)
+			continue;
+
+		ret = cb(mac, fid, false, data);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
 }
 
 static int ksz8_add_sta_mac(struct ksz_device *dev, int port,
diff --git a/drivers/net/dsa/microchip/ksz8795_reg.h b/drivers/net/dsa/microchip/ksz8795_reg.h
index 7c9341ef73b03..0d13a6e29b0e6 100644
--- a/drivers/net/dsa/microchip/ksz8795_reg.h
+++ b/drivers/net/dsa/microchip/ksz8795_reg.h
@@ -794,5 +794,6 @@
 #define TAIL_TAG_LOOKUP			BIT(7)
 
 #define FID_ENTRIES			128
+#define KSZ8_DYN_MAC_ENTRIES		1024
 
 #endif
-- 
2.39.2

Re: [PATCH net-next v1 3/8] net: dsa: microchip: ksz8: Refactor ksz8_fdb_dump()

[Arun.Ramadoss]

Hi Oleksij,

On Tue, 2024-04-02 at 15:13 +0200, Oleksij Rempel wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
> know the content is safe
> 
> Refactor ksz8_fdb_dump() to address potential issues:
> - Limit the number of iterations to avoid endless loops.
> - Handle error codes returned by ksz8_r_dyn_mac_table(), with
>   an exception for -ENXIO when no more dynamic entries are detected.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
> ---
>  drivers/net/dsa/microchip/ksz8795.c     | 38 ++++++++++++++---------
> --
>  drivers/net/dsa/microchip/ksz8795_reg.h |  1 +
>  2 files changed, 23 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/net/dsa/microchip/ksz8795.c
> b/drivers/net/dsa/microchip/ksz8795.c
> index e407111db6637..b70aa2c0a85ec 100644
> --- a/drivers/net/dsa/microchip/ksz8795.c
> +++ b/drivers/net/dsa/microchip/ksz8795.c
> @@ -1191,27 +1191,33 @@ void ksz8_flush_dyn_mac_table(struct
> ksz_device *dev, int port)
>  int ksz8_fdb_dump(struct ksz_device *dev, int port,
>                   dsa_fdb_dump_cb_t *cb, void *data)
>  {
> -       int ret = 0;
> -       u16 i = 0;
>         u16 entries = 0;
> -       u8 fid;
> -       u8 src_port;
> -       u8 mac[ETH_ALEN];
> +       int ret, i;
> +
> +       for (i = 0; i < KSZ8_DYN_MAC_ENTRIES; i++) {
> +               u8 mac[ETH_ALEN];
> +               u8 src_port;
> +               u8 fid;

IMO:Since there is no code other than for loop in this function,
variable declaraion can be as before.

> 
> -       do {
>                 ret = ksz8_r_dyn_mac_table(dev, i, mac, &fid,
> &src_port,
>                                            &entries);
> -               if (!ret && port == src_port) {
> -                       ret = cb(mac, fid, false, data);
> -                       if (ret)
> -                               break;
> -               }
> -               i++;
> -       } while (i < entries);
> -       if (i >= entries)
> -               ret = 0;
> +               if (ret == -ENXIO)
> +                       return 0;
> +               if (ret)
> +                       return ret;
> 
> -       return ret;
> +               if (i >= entries)
> +                       return 0;
> +
> +               if (port != src_port)
> +                       continue;

IMO: since already many returns in function, if above statement
replaced as below will increase readability.

	if (port == src_port) {
		ret = cb(mac, fid, false, data);
		if (ret)
			return ret;
	}
> +
> +               ret = cb(mac, fid, false, data);
> +               if (ret)
> +                       return ret;
> +       }
> +
> +       return 0;
>  }
> 
>  static int ksz8_add_sta_mac(struct ksz_device *dev, int port,
> diff --git a/drivers/net/dsa/microchip/ksz8795_reg.h
> b/drivers/net/dsa/microchip/ksz8795_reg.h
> index 7c9341ef73b03..0d13a6e29b0e6 100644
> --- a/drivers/net/dsa/microchip/ksz8795_reg.h
> +++ b/drivers/net/dsa/microchip/ksz8795_reg.h
> @@ -794,5 +794,6 @@
>  #define TAIL_TAG_LOOKUP                        BIT(7)
> 
>  #define FID_ENTRIES                    128
> +#define KSZ8_DYN_MAC_ENTRIES           1024
> 
>  #endif
> --
> 2.39.2
> 

[PATCH net-next v1 4/8] net: dsa: microchip: ksz8: Refactor ksz8_r_dyn_mac_table() for readability

[Oleksij Rempel]

Move the code out of a long if statement scope in ksz8_r_dyn_mac_table()
to improve code readability.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 drivers/net/dsa/microchip/ksz8795.c | 60 +++++++++++++++--------------
 1 file changed, 31 insertions(+), 29 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
index b70aa2c0a85ec..1962195e16a6f 100644
--- a/drivers/net/dsa/microchip/ksz8795.c
+++ b/drivers/net/dsa/microchip/ksz8795.c
@@ -416,7 +416,9 @@ static int ksz8_r_dyn_mac_table(struct ksz_device *dev, u16 addr, u8 *mac_addr,
 	const u32 *masks;
 	const u16 *regs;
 	u16 ctrl_addr;
+	u64 buf = 0;
 	u8 data;
+	int cnt;
 	int rc;
 
 	shifts = dev->info->shifts;
@@ -432,38 +434,38 @@ static int ksz8_r_dyn_mac_table(struct ksz_device *dev, u16 addr, u8 *mac_addr,
 	if (rc == -EAGAIN) {
 		if (addr == 0)
 			*entries = 0;
+		goto unlock_alu;
 	} else if (rc == -ENXIO) {
 		*entries = 0;
-	/* At least one valid entry in the table. */
-	} else {
-		u64 buf = 0;
-		int cnt;
-
-		ksz_read64(dev, regs[REG_IND_DATA_HI], &buf);
-		data_hi = (u32)(buf >> 32);
-		data_lo = (u32)buf;
-
-		/* Check out how many valid entry in the table. */
-		cnt = data & masks[DYNAMIC_MAC_TABLE_ENTRIES_H];
-		cnt <<= shifts[DYNAMIC_MAC_ENTRIES_H];
-		cnt |= (data_hi & masks[DYNAMIC_MAC_TABLE_ENTRIES]) >>
-			shifts[DYNAMIC_MAC_ENTRIES];
-		*entries = cnt + 1;
-
-		*fid = (data_hi & masks[DYNAMIC_MAC_TABLE_FID]) >>
-			shifts[DYNAMIC_MAC_FID];
-		*src_port = (data_hi & masks[DYNAMIC_MAC_TABLE_SRC_PORT]) >>
-			shifts[DYNAMIC_MAC_SRC_PORT];
-
-		mac_addr[5] = (u8)data_lo;
-		mac_addr[4] = (u8)(data_lo >> 8);
-		mac_addr[3] = (u8)(data_lo >> 16);
-		mac_addr[2] = (u8)(data_lo >> 24);
-
-		mac_addr[1] = (u8)data_hi;
-		mac_addr[0] = (u8)(data_hi >> 8);
-		rc = 0;
+		goto unlock_alu;
 	}
+
+	ksz_read64(dev, regs[REG_IND_DATA_HI], &buf);
+	data_hi = (u32)(buf >> 32);
+	data_lo = (u32)buf;
+
+	/* Check out how many valid entry in the table. */
+	cnt = data & masks[DYNAMIC_MAC_TABLE_ENTRIES_H];
+	cnt <<= shifts[DYNAMIC_MAC_ENTRIES_H];
+	cnt |= (data_hi & masks[DYNAMIC_MAC_TABLE_ENTRIES]) >>
+		shifts[DYNAMIC_MAC_ENTRIES];
+	*entries = cnt + 1;
+
+	*fid = (data_hi & masks[DYNAMIC_MAC_TABLE_FID]) >>
+		shifts[DYNAMIC_MAC_FID];
+	*src_port = (data_hi & masks[DYNAMIC_MAC_TABLE_SRC_PORT]) >>
+		shifts[DYNAMIC_MAC_SRC_PORT];
+
+	mac_addr[5] = (u8)data_lo;
+	mac_addr[4] = (u8)(data_lo >> 8);
+	mac_addr[3] = (u8)(data_lo >> 16);
+	mac_addr[2] = (u8)(data_lo >> 24);
+
+	mac_addr[1] = (u8)data_hi;
+	mac_addr[0] = (u8)(data_hi >> 8);
+	rc = 0;
+
+unlock_alu:
 	mutex_unlock(&dev->alu_mutex);
 
 	return rc;
-- 
2.39.2

Re: [PATCH net-next v1 4/8] net: dsa: microchip: ksz8: Refactor ksz8_r_dyn_mac_table() for readability

[Arun.Ramadoss]

Hi Oleksij,

On Tue, 2024-04-02 at 15:13 +0200, Oleksij Rempel wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
> know the content is safe
> 
> Move the code out of a long if statement scope in
> ksz8_r_dyn_mac_table()
> to improve code readability.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
> ---
>  drivers/net/dsa/microchip/ksz8795.c | 60 +++++++++++++++----------
> ----
>  1 file changed, 31 insertions(+), 29 deletions(-)
> 
> diff --git a/drivers/net/dsa/microchip/ksz8795.c
> b/drivers/net/dsa/microchip/ksz8795.c
> index b70aa2c0a85ec..1962195e16a6f 100644
> --- a/drivers/net/dsa/microchip/ksz8795.c
> +++ b/drivers/net/dsa/microchip/ksz8795.c
> @@ -416,7 +416,9 @@ static int ksz8_r_dyn_mac_table(struct ksz_device
> *dev, u16 addr, u8 *mac_addr,
>         const u32 *masks;
>         const u16 *regs;
>         u16 ctrl_addr;
> +       u64 buf = 0;
>         u8 data;
> +       int cnt;
>         int rc;

If rc is initialized with 0, we don't need to assign rc = 0 in the
success path.

But otherwise
Acked-by: Arun Ramadoss <arun.ramadoss@microchip.com>

> 
>         shifts = dev->info->shifts;
> @@ -432,38 +434,38 @@ static int ksz8_r_dyn_mac_table(struct
> ksz_device *dev, u16 addr, u8 *mac_addr,
>         if (rc == -EAGAIN) {
>                 if (addr == 0)
>                         *entries = 0;
> +               goto unlock_alu;
>         } else if (rc == -ENXIO) {
>                 *entries = 0;
> -       /* At least one valid entry in the table. */
> -       } else {
> -               u64 buf = 0;
> -               int cnt;
> -
> -               ksz_read64(dev, regs[REG_IND_DATA_HI], &buf);
> -               data_hi = (u32)(buf >> 32);
> -               data_lo = (u32)buf;
> -
> -               /* Check out how many valid entry in the table. */
> -               cnt = data & masks[DYNAMIC_MAC_TABLE_ENTRIES_H];
> -               cnt <<= shifts[DYNAMIC_MAC_ENTRIES_H];
> -               cnt |= (data_hi & masks[DYNAMIC_MAC_TABLE_ENTRIES])
> >>
> -                       shifts[DYNAMIC_MAC_ENTRIES];
> -               *entries = cnt + 1;
> -
> -               *fid = (data_hi & masks[DYNAMIC_MAC_TABLE_FID]) >>
> -                       shifts[DYNAMIC_MAC_FID];
> -               *src_port = (data_hi &
> masks[DYNAMIC_MAC_TABLE_SRC_PORT]) >>
> -                       shifts[DYNAMIC_MAC_SRC_PORT];
> -
> -               mac_addr[5] = (u8)data_lo;
> -               mac_addr[4] = (u8)(data_lo >> 8);
> -               mac_addr[3] = (u8)(data_lo >> 16);
> -               mac_addr[2] = (u8)(data_lo >> 24);
> -
> -               mac_addr[1] = (u8)data_hi;
> -               mac_addr[0] = (u8)(data_hi >> 8);
> -               rc = 0;
> +               goto unlock_alu;
>         }
> +
> +       ksz_read64(dev, regs[REG_IND_DATA_HI], &buf);
> +       data_hi = (u32)(buf >> 32);
> +       data_lo = (u32)buf;
> +
> +       /* Check out how many valid entry in the table. */
> +       cnt = data & masks[DYNAMIC_MAC_TABLE_ENTRIES_H];
> +       cnt <<= shifts[DYNAMIC_MAC_ENTRIES_H];
> +       cnt |= (data_hi & masks[DYNAMIC_MAC_TABLE_ENTRIES]) >>
> +               shifts[DYNAMIC_MAC_ENTRIES];
> +       *entries = cnt + 1;
> +
> +       *fid = (data_hi & masks[DYNAMIC_MAC_TABLE_FID]) >>
> +               shifts[DYNAMIC_MAC_FID];
> +       *src_port = (data_hi & masks[DYNAMIC_MAC_TABLE_SRC_PORT]) >>
> +               shifts[DYNAMIC_MAC_SRC_PORT];
> +
> +       mac_addr[5] = (u8)data_lo;
> +       mac_addr[4] = (u8)(data_lo >> 8);
> +       mac_addr[3] = (u8)(data_lo >> 16);
> +       mac_addr[2] = (u8)(data_lo >> 24);
> +
> +       mac_addr[1] = (u8)data_hi;
> +       mac_addr[0] = (u8)(data_hi >> 8);
> +       rc = 0;
> +
> +unlock_alu:
>         mutex_unlock(&dev->alu_mutex);
> 
>         return rc;
> --
> 2.39.2
> 

Re: [PATCH net-next v1 4/8] net: dsa: microchip: ksz8: Refactor ksz8_r_dyn_mac_table() for readability

[Jakub Kicinski]

On Tue, 2 Apr 2024 15:44:30 +0000 Arun.Ramadoss@microchip.com wrote:
> >         int rc;  
> 
> If rc is initialized with 0, we don't need to assign rc = 0 in the
> success path.

Not so sure -- it's easier for the compiler to catch uninitialized
variables than "accidentally stale" values.

[PATCH net-next v1 5/8] net: dsa: microchip: ksz8: Unify variable naming in ksz8_r_dyn_mac_table()

[Oleksij Rempel]

Use 'ret' instead of 'rc' in ksz8_r_dyn_mac_table() to maintain
consistency with the rest of the file.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 drivers/net/dsa/microchip/ksz8795.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
index 1962195e16a6f..d5ec4b9772752 100644
--- a/drivers/net/dsa/microchip/ksz8795.c
+++ b/drivers/net/dsa/microchip/ksz8795.c
@@ -419,7 +419,7 @@ static int ksz8_r_dyn_mac_table(struct ksz_device *dev, u16 addr, u8 *mac_addr,
 	u64 buf = 0;
 	u8 data;
 	int cnt;
-	int rc;
+	int ret;
 
 	shifts = dev->info->shifts;
 	masks = dev->info->masks;
@@ -430,12 +430,12 @@ static int ksz8_r_dyn_mac_table(struct ksz_device *dev, u16 addr, u8 *mac_addr,
 	mutex_lock(&dev->alu_mutex);
 	ksz_write16(dev, regs[REG_IND_CTRL_0], ctrl_addr);
 
-	rc = ksz8_valid_dyn_entry(dev, &data);
-	if (rc == -EAGAIN) {
+	ret = ksz8_valid_dyn_entry(dev, &data);
+	if (ret == -EAGAIN) {
 		if (addr == 0)
 			*entries = 0;
 		goto unlock_alu;
-	} else if (rc == -ENXIO) {
+	} else if (ret == -ENXIO) {
 		*entries = 0;
 		goto unlock_alu;
 	}
@@ -463,12 +463,12 @@ static int ksz8_r_dyn_mac_table(struct ksz_device *dev, u16 addr, u8 *mac_addr,
 
 	mac_addr[1] = (u8)data_hi;
 	mac_addr[0] = (u8)(data_hi >> 8);
-	rc = 0;
+	ret = 0;
 
 unlock_alu:
 	mutex_unlock(&dev->alu_mutex);
 
-	return rc;
+	return ret;
 }
 
 static int ksz8_r_sta_mac_table(struct ksz_device *dev, u16 addr,
-- 
2.39.2

Re: [PATCH net-next v1 5/8] net: dsa: microchip: ksz8: Unify variable naming in ksz8_r_dyn_mac_table()

[Arun.Ramadoss]

On Tue, 2024-04-02 at 15:13 +0200, Oleksij Rempel wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
> know the content is safe
> 
> Use 'ret' instead of 'rc' in ksz8_r_dyn_mac_table() to maintain
> consistency with the rest of the file.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>

Acked-by: Arun Ramadoss <arun.ramadoss@microchip.com>

[PATCH net-next v1 6/8] net: dsa: microchip: ksz8_r_dyn_mac_table(): ksz: do not return EAGAIN on timeout

[Oleksij Rempel]

EAGAIN was not used by previous code and not used by  current code. So,
remove it and use proper error value.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 drivers/net/dsa/microchip/ksz8795.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
index d5ec4b9772752..401f77055cc27 100644
--- a/drivers/net/dsa/microchip/ksz8795.c
+++ b/drivers/net/dsa/microchip/ksz8795.c
@@ -396,7 +396,7 @@ static int ksz8_valid_dyn_entry(struct ksz_device *dev, u8 *data)
 
 	/* Entry is not ready for accessing. */
 	if (*data & masks[DYNAMIC_MAC_TABLE_NOT_READY]) {
-		return -EAGAIN;
+		return -ETIMEDOUT;
 	/* Entry is ready for accessing. */
 	} else {
 		ksz_read8(dev, regs[REG_IND_DATA_8], data);
@@ -431,15 +431,14 @@ static int ksz8_r_dyn_mac_table(struct ksz_device *dev, u16 addr, u8 *mac_addr,
 	ksz_write16(dev, regs[REG_IND_CTRL_0], ctrl_addr);
 
 	ret = ksz8_valid_dyn_entry(dev, &data);
-	if (ret == -EAGAIN) {
-		if (addr == 0)
-			*entries = 0;
-		goto unlock_alu;
-	} else if (ret == -ENXIO) {
+	if (ret == -ENXIO) {
 		*entries = 0;
 		goto unlock_alu;
 	}
 
+	if (ret)
+		goto unlock_alu;
+
 	ksz_read64(dev, regs[REG_IND_DATA_HI], &buf);
 	data_hi = (u32)(buf >> 32);
 	data_lo = (u32)buf;
-- 
2.39.2

Re: [PATCH net-next v1 6/8] net: dsa: microchip: ksz8_r_dyn_mac_table(): ksz: do not return EAGAIN on timeout

[Arun.Ramadoss]

On Tue, 2024-04-02 at 15:13 +0200, Oleksij Rempel wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
> know the content is safe
> 
> EAGAIN was not used by previous code and not used by  current code.
> So,
> remove it and use proper error value.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>

Acked-by: Arun Ramadoss <arun.ramadoss@microchip.com>

[PATCH net-next v1 7/8] net: dsa: microchip: ksz8_r_dyn_mac_table(): return read/write error if we got any

[Oleksij Rempel]

The read/write path may fail. So, return error if we got it.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 drivers/net/dsa/microchip/ksz8795.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
index 401f77055cc27..27dfcc645567d 100644
--- a/drivers/net/dsa/microchip/ksz8795.c
+++ b/drivers/net/dsa/microchip/ksz8795.c
@@ -385,12 +385,16 @@ static int ksz8_valid_dyn_entry(struct ksz_device *dev, u8 *data)
 	int timeout = 100;
 	const u32 *masks;
 	const u16 *regs;
+	int ret;
 
 	masks = dev->info->masks;
 	regs = dev->info->regs;
 
 	do {
-		ksz_read8(dev, regs[REG_IND_DATA_CHECK], data);
+		ret = ksz_read8(dev, regs[REG_IND_DATA_CHECK], data);
+		if (ret)
+			return ret;
+
 		timeout--;
 	} while ((*data & masks[DYNAMIC_MAC_TABLE_NOT_READY]) && timeout);
 
@@ -399,7 +403,9 @@ static int ksz8_valid_dyn_entry(struct ksz_device *dev, u8 *data)
 		return -ETIMEDOUT;
 	/* Entry is ready for accessing. */
 	} else {
-		ksz_read8(dev, regs[REG_IND_DATA_8], data);
+		ret = ksz_read8(dev, regs[REG_IND_DATA_8], data);
+		if (ret)
+			return ret;
 
 		/* There is no valid entry in the table. */
 		if (*data & masks[DYNAMIC_MAC_TABLE_MAC_EMPTY])
@@ -428,7 +434,9 @@ static int ksz8_r_dyn_mac_table(struct ksz_device *dev, u16 addr, u8 *mac_addr,
 	ctrl_addr = IND_ACC_TABLE(TABLE_DYNAMIC_MAC | TABLE_READ) | addr;
 
 	mutex_lock(&dev->alu_mutex);
-	ksz_write16(dev, regs[REG_IND_CTRL_0], ctrl_addr);
+	ret = ksz_write16(dev, regs[REG_IND_CTRL_0], ctrl_addr);
+	if (ret)
+		goto unlock_alu;
 
 	ret = ksz8_valid_dyn_entry(dev, &data);
 	if (ret == -ENXIO) {
@@ -439,7 +447,10 @@ static int ksz8_r_dyn_mac_table(struct ksz_device *dev, u16 addr, u8 *mac_addr,
 	if (ret)
 		goto unlock_alu;
 
-	ksz_read64(dev, regs[REG_IND_DATA_HI], &buf);
+	ret = ksz_read64(dev, regs[REG_IND_DATA_HI], &buf);
+	if (ret)
+		goto unlock_alu;
+
 	data_hi = (u32)(buf >> 32);
 	data_lo = (u32)buf;
 
@@ -462,7 +473,6 @@ static int ksz8_r_dyn_mac_table(struct ksz_device *dev, u16 addr, u8 *mac_addr,
 
 	mac_addr[1] = (u8)data_hi;
 	mac_addr[0] = (u8)(data_hi >> 8);
-	ret = 0;
 
 unlock_alu:
 	mutex_unlock(&dev->alu_mutex);
-- 
2.39.2

Re: [PATCH net-next v1 7/8] net: dsa: microchip: ksz8_r_dyn_mac_table(): return read/write error if we got any

[Arun.Ramadoss]

On Tue, 2024-04-02 at 15:13 +0200, Oleksij Rempel wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
> know the content is safe
> 
> The read/write path may fail. So, return error if we got it.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>

Acked-by: Arun Ramadoss <arun.ramadoss@microchip.com> 

[PATCH net-next v1 8/8] net: dsa: microchip: ksz8_r_dyn_mac_table(): use entries variable to signal 0 entries

[Oleksij Rempel]

We already have a variable to provide number of entries. So use it,
instead of using error number.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 drivers/net/dsa/microchip/ksz8795.c | 24 +++++++-----------------
 1 file changed, 7 insertions(+), 17 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
index 27dfcc645567d..813c701b71180 100644
--- a/drivers/net/dsa/microchip/ksz8795.c
+++ b/drivers/net/dsa/microchip/ksz8795.c
@@ -399,19 +399,11 @@ static int ksz8_valid_dyn_entry(struct ksz_device *dev, u8 *data)
 	} while ((*data & masks[DYNAMIC_MAC_TABLE_NOT_READY]) && timeout);
 
 	/* Entry is not ready for accessing. */
-	if (*data & masks[DYNAMIC_MAC_TABLE_NOT_READY]) {
+	if (*data & masks[DYNAMIC_MAC_TABLE_NOT_READY])
 		return -ETIMEDOUT;
-	/* Entry is ready for accessing. */
-	} else {
-		ret = ksz_read8(dev, regs[REG_IND_DATA_8], data);
-		if (ret)
-			return ret;
 
-		/* There is no valid entry in the table. */
-		if (*data & masks[DYNAMIC_MAC_TABLE_MAC_EMPTY])
-			return -ENXIO;
-	}
-	return 0;
+	/* Entry is ready for accessing. */
+	return ksz_read8(dev, regs[REG_IND_DATA_8], data);
 }
 
 static int ksz8_r_dyn_mac_table(struct ksz_device *dev, u16 addr, u8 *mac_addr,
@@ -439,13 +431,13 @@ static int ksz8_r_dyn_mac_table(struct ksz_device *dev, u16 addr, u8 *mac_addr,
 		goto unlock_alu;
 
 	ret = ksz8_valid_dyn_entry(dev, &data);
-	if (ret == -ENXIO) {
-		*entries = 0;
+	if (ret)
 		goto unlock_alu;
-	}
 
-	if (ret)
+	if (data & masks[DYNAMIC_MAC_TABLE_MAC_EMPTY]) {
+		*entries = 0;
 		goto unlock_alu;
+	}
 
 	ret = ksz_read64(dev, regs[REG_IND_DATA_HI], &buf);
 	if (ret)
@@ -1212,8 +1204,6 @@ int ksz8_fdb_dump(struct ksz_device *dev, int port,
 
 		ret = ksz8_r_dyn_mac_table(dev, i, mac, &fid, &src_port,
 					   &entries);
-		if (ret == -ENXIO)
-			return 0;
 		if (ret)
 			return ret;
 
-- 
2.39.2

Re: [PATCH net-next v1 8/8] net: dsa: microchip: ksz8_r_dyn_mac_table(): use entries variable to signal 0 entries

[Arun.Ramadoss]

On Tue, 2024-04-02 at 15:13 +0200, Oleksij Rempel wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
> know the content is safe
> 
> We already have a variable to provide number of entries. So use it,
> instead of using error number.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>

Acked-by: Arun Ramadoss <arun.ramadoss@microchip.com>

Re: [PATCH net-next v1 0/8] net: dsa: microchip: ksz8: refactor FDB dump path

[Vladimir Oltean]

On Tue, Apr 02, 2024 at 03:13:31PM +0200, Oleksij Rempel wrote:
> Refactor FDB dump code path for Microchip KSZ8xxx series. This series
> mostly makes some cosmetic reworks and allows to forward errors detected
> by the regmap.

Reviewed-by: Vladimir Oltean <olteanv@gmail.com>