[PATCH net-next v2 0/2] net: dsa: yt921x: Fix parsing MIB attributes

[PATCH net-next v2 0/2] net: dsa: yt921x: Fix parsing MIB attributes

[David Yang]

v1: https://lore.kernel.org/r/20251118091237.2208994-1-mmyangfl@gmail.com
  - reword commit message and add a fixes tag
  - add #defines for each MIB location

David Yang (2):
  net: dsa: yt921x: Fix parsing MIB attributes
  net: dsa: yt921x: Use macros for MIB locations

 drivers/net/dsa/yt921x.c | 105 +++++++++++++++++++--------------------
 drivers/net/dsa/yt921x.h |  54 ++++++++++++++++++++
 2 files changed, 104 insertions(+), 55 deletions(-)

--
2.51.0

[PATCH net-next v2 1/2] net: dsa: yt921x: Fix parsing MIB attributes

[David Yang]

There are hard-to-find unused fields in the MIB table I didn't notice in
the example driver code, causing wrong interpretation of the MIB data.

For some 64-bit attributes, the current (wrong) implementation took the
correct lower 32 bits, but messed up the upper 32 bits, so it would work
accidentally until 32-bit overflows happen. Fix that too.

Fixes: 186623f4aa72 ("net: dsa: yt921x: Add support for Motorcomm YT921x")
Signed-off-by: David Yang <mmyangfl@gmail.com>
---
 drivers/net/dsa/yt921x.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/net/dsa/yt921x.c b/drivers/net/dsa/yt921x.c
index 944988e29127..97fc6085f4d0 100644
--- a/drivers/net/dsa/yt921x.c
+++ b/drivers/net/dsa/yt921x.c
@@ -56,13 +56,13 @@ static const struct yt921x_mib_desc yt921x_mib_descs[] = {
 
 	MIB_DESC(1, 0x30, NULL),	/* RxPktSz1024To1518 */
 	MIB_DESC(1, 0x34, NULL),	/* RxPktSz1519ToMax */
-	MIB_DESC(2, 0x38, NULL),	/* RxGoodBytes */
-	/* 0x3c */
+	/* 0x38 unused */
+	MIB_DESC(2, 0x3c, NULL),	/* RxGoodBytes */
 
-	MIB_DESC(2, 0x40, "RxBadBytes"),
-	/* 0x44 */
-	MIB_DESC(2, 0x48, NULL),	/* RxOverSzErr */
-	/* 0x4c */
+	/* 0x40 */
+	MIB_DESC(2, 0x44, "RxBadBytes"),
+	/* 0x48 */
+	MIB_DESC(1, 0x4c, NULL),	/* RxOverSzErr */
 
 	MIB_DESC(1, 0x50, NULL),	/* RxDropped */
 	MIB_DESC(1, 0x54, NULL),	/* TxBroadcast */
@@ -79,10 +79,10 @@ static const struct yt921x_mib_desc yt921x_mib_descs[] = {
 	MIB_DESC(1, 0x78, NULL),	/* TxPktSz1024To1518 */
 	MIB_DESC(1, 0x7c, NULL),	/* TxPktSz1519ToMax */
 
-	MIB_DESC(2, 0x80, NULL),	/* TxGoodBytes */
-	/* 0x84 */
-	MIB_DESC(2, 0x88, NULL),	/* TxCollision */
-	/* 0x8c */
+	/* 0x80 unused */
+	MIB_DESC(2, 0x84, NULL),	/* TxGoodBytes */
+	/* 0x88 */
+	MIB_DESC(1, 0x8c, NULL),	/* TxCollision */
 
 	MIB_DESC(1, 0x90, NULL),	/* TxExcessiveCollistion */
 	MIB_DESC(1, 0x94, NULL),	/* TxMultipleCollision */
@@ -705,7 +705,7 @@ static int yt921x_read_mib(struct yt921x_priv *priv, int port)
 			res = yt921x_reg_read(priv, reg + 4, &val1);
 			if (res)
 				break;
-			val = ((u64)val0 << 32) | val1;
+			val = ((u64)val1 << 32) | val0;
 		}
 
 		WRITE_ONCE(*valp, val);
-- 
2.51.0

[PATCH net-next v2 2/2] net: dsa: yt921x: Use macros for MIB locations

[David Yang]

Extract MIB constants into the header file to improve code style. This
patch will not change the behavior of the function.

Signed-off-by: David Yang <mmyangfl@gmail.com>
---
 drivers/net/dsa/yt921x.c | 103 +++++++++++++++++++--------------------
 drivers/net/dsa/yt921x.h |  54 ++++++++++++++++++++
 2 files changed, 103 insertions(+), 54 deletions(-)

diff --git a/drivers/net/dsa/yt921x.c b/drivers/net/dsa/yt921x.c
index 97fc6085f4d0..ebfd34f72314 100644
--- a/drivers/net/dsa/yt921x.c
+++ b/drivers/net/dsa/yt921x.c
@@ -39,60 +39,55 @@ struct yt921x_mib_desc {
  * to perform 32bit MIB overflow wraparound.
  */
 static const struct yt921x_mib_desc yt921x_mib_descs[] = {
-	MIB_DESC(1, 0x00, NULL),	/* RxBroadcast */
-	MIB_DESC(1, 0x04, NULL),	/* RxPause */
-	MIB_DESC(1, 0x08, NULL),	/* RxMulticast */
-	MIB_DESC(1, 0x0c, NULL),	/* RxCrcErr */
-
-	MIB_DESC(1, 0x10, NULL),	/* RxAlignErr */
-	MIB_DESC(1, 0x14, NULL),	/* RxUnderSizeErr */
-	MIB_DESC(1, 0x18, NULL),	/* RxFragErr */
-	MIB_DESC(1, 0x1c, NULL),	/* RxPktSz64 */
-
-	MIB_DESC(1, 0x20, NULL),	/* RxPktSz65To127 */
-	MIB_DESC(1, 0x24, NULL),	/* RxPktSz128To255 */
-	MIB_DESC(1, 0x28, NULL),	/* RxPktSz256To511 */
-	MIB_DESC(1, 0x2c, NULL),	/* RxPktSz512To1023 */
-
-	MIB_DESC(1, 0x30, NULL),	/* RxPktSz1024To1518 */
-	MIB_DESC(1, 0x34, NULL),	/* RxPktSz1519ToMax */
-	/* 0x38 unused */
-	MIB_DESC(2, 0x3c, NULL),	/* RxGoodBytes */
-
-	/* 0x40 */
-	MIB_DESC(2, 0x44, "RxBadBytes"),
-	/* 0x48 */
-	MIB_DESC(1, 0x4c, NULL),	/* RxOverSzErr */
-
-	MIB_DESC(1, 0x50, NULL),	/* RxDropped */
-	MIB_DESC(1, 0x54, NULL),	/* TxBroadcast */
-	MIB_DESC(1, 0x58, NULL),	/* TxPause */
-	MIB_DESC(1, 0x5c, NULL),	/* TxMulticast */
-
-	MIB_DESC(1, 0x60, NULL),	/* TxUnderSizeErr */
-	MIB_DESC(1, 0x64, NULL),	/* TxPktSz64 */
-	MIB_DESC(1, 0x68, NULL),	/* TxPktSz65To127 */
-	MIB_DESC(1, 0x6c, NULL),	/* TxPktSz128To255 */
-
-	MIB_DESC(1, 0x70, NULL),	/* TxPktSz256To511 */
-	MIB_DESC(1, 0x74, NULL),	/* TxPktSz512To1023 */
-	MIB_DESC(1, 0x78, NULL),	/* TxPktSz1024To1518 */
-	MIB_DESC(1, 0x7c, NULL),	/* TxPktSz1519ToMax */
-
-	/* 0x80 unused */
-	MIB_DESC(2, 0x84, NULL),	/* TxGoodBytes */
-	/* 0x88 */
-	MIB_DESC(1, 0x8c, NULL),	/* TxCollision */
-
-	MIB_DESC(1, 0x90, NULL),	/* TxExcessiveCollistion */
-	MIB_DESC(1, 0x94, NULL),	/* TxMultipleCollision */
-	MIB_DESC(1, 0x98, NULL),	/* TxSingleCollision */
-	MIB_DESC(1, 0x9c, NULL),	/* TxPkt */
-
-	MIB_DESC(1, 0xa0, NULL),	/* TxDeferred */
-	MIB_DESC(1, 0xa4, NULL),	/* TxLateCollision */
-	MIB_DESC(1, 0xa8, "RxOAM"),
-	MIB_DESC(1, 0xac, "TxOAM"),
+	MIB_DESC(1, YT921X_MIB_DATA_RX_BROADCAST, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_RX_PAUSE, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_RX_MULTICAST, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_RX_CRC_ERR, NULL),
+
+	MIB_DESC(1, YT921X_MIB_DATA_RX_ALIGN_ERR, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_RX_UNDERSIZE_ERR, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_RX_FRAG_ERR, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_RX_PKT_SZ_64, NULL),
+
+	MIB_DESC(1, YT921X_MIB_DATA_RX_PKT_SZ_65_TO_127, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_RX_PKT_SZ_128_TO_255, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_RX_PKT_SZ_256_TO_511, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_RX_PKT_SZ_512_TO_1023, NULL),
+
+	MIB_DESC(1, YT921X_MIB_DATA_RX_PKT_SZ_1024_TO_1518, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_RX_PKT_SZ_1519_TO_MAX, NULL),
+	MIB_DESC(2, YT921X_MIB_DATA_RX_GOOD_BYTES, NULL),
+
+	MIB_DESC(2, YT921X_MIB_DATA_RX_BAD_BYTES, "RxBadBytes"),
+	MIB_DESC(1, YT921X_MIB_DATA_RX_OVERSIZE_ERR, NULL),
+
+	MIB_DESC(1, YT921X_MIB_DATA_RX_DROPPED, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_TX_BROADCAST, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_TX_PAUSE, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_TX_MULTICAST, NULL),
+
+	MIB_DESC(1, YT921X_MIB_DATA_TX_UNDERSIZE_ERR, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_TX_PKT_SZ_64, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_TX_PKT_SZ_65_TO_127, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_TX_PKT_SZ_128_TO_255, NULL),
+
+	MIB_DESC(1, YT921X_MIB_DATA_TX_PKT_SZ_256_TO_511, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_TX_PKT_SZ_512_TO_1023, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_TX_PKT_SZ_1024_TO_1518, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_TX_PKT_SZ_1519_TO_MAX, NULL),
+
+	MIB_DESC(2, YT921X_MIB_DATA_TX_GOOD_BYTES, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_TX_COLLISION, NULL),
+
+	MIB_DESC(1, YT921X_MIB_DATA_TX_EXCESSIVE_COLLISION, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_TX_MULTIPLE_COLLISION, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_TX_SINGLE_COLLISION, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_TX_PKT, NULL),
+
+	MIB_DESC(1, YT921X_MIB_DATA_TX_DEFERRED, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_TX_LATE_COLLISION, NULL),
+	MIB_DESC(1, YT921X_MIB_DATA_RX_OAM, "RxOAM"),
+	MIB_DESC(1, YT921X_MIB_DATA_TX_OAM, "TxOAM"),
 };
 
 struct yt921x_info {
diff --git a/drivers/net/dsa/yt921x.h b/drivers/net/dsa/yt921x.h
index 3e85d90826fb..44719d841d40 100644
--- a/drivers/net/dsa/yt921x.h
+++ b/drivers/net/dsa/yt921x.h
@@ -173,6 +173,60 @@
 #define  YT921X_MIB_CTRL_ALL_PORT		BIT(0)
 #define YT921X_MIBn_DATA0(port)		(0xc0100 + 0x100 * (port))
 #define YT921X_MIBn_DATAm(port, x)	(YT921X_MIBn_DATA0(port) + 4 * (x))
+#define  YT921X_MIB_DATA_RX_BROADCAST		0x00
+#define  YT921X_MIB_DATA_RX_PAUSE		0x04
+#define  YT921X_MIB_DATA_RX_MULTICAST		0x08
+#define  YT921X_MIB_DATA_RX_CRC_ERR		0x0c
+
+#define  YT921X_MIB_DATA_RX_ALIGN_ERR		0x10
+#define  YT921X_MIB_DATA_RX_UNDERSIZE_ERR	0x14
+#define  YT921X_MIB_DATA_RX_FRAG_ERR		0x18
+#define  YT921X_MIB_DATA_RX_PKT_SZ_64		0x1c
+
+#define  YT921X_MIB_DATA_RX_PKT_SZ_65_TO_127	0x20
+#define  YT921X_MIB_DATA_RX_PKT_SZ_128_TO_255	0x24
+#define  YT921X_MIB_DATA_RX_PKT_SZ_256_TO_511	0x28
+#define  YT921X_MIB_DATA_RX_PKT_SZ_512_TO_1023	0x2c
+
+#define  YT921X_MIB_DATA_RX_PKT_SZ_1024_TO_1518	0x30
+#define  YT921X_MIB_DATA_RX_PKT_SZ_1519_TO_MAX	0x34
+/* 0x38: unused */
+#define  YT921X_MIB_DATA_RX_GOOD_BYTES		0x3c
+
+/* 0x40: 64 bytes */
+#define  YT921X_MIB_DATA_RX_BAD_BYTES		0x44
+/* 0x48: 64 bytes */
+#define  YT921X_MIB_DATA_RX_OVERSIZE_ERR	0x4c
+
+#define  YT921X_MIB_DATA_RX_DROPPED		0x50
+#define  YT921X_MIB_DATA_TX_BROADCAST		0x54
+#define  YT921X_MIB_DATA_TX_PAUSE		0x58
+#define  YT921X_MIB_DATA_TX_MULTICAST		0x5c
+
+#define  YT921X_MIB_DATA_TX_UNDERSIZE_ERR	0x60
+#define  YT921X_MIB_DATA_TX_PKT_SZ_64		0x64
+#define  YT921X_MIB_DATA_TX_PKT_SZ_65_TO_127	0x68
+#define  YT921X_MIB_DATA_TX_PKT_SZ_128_TO_255	0x6c
+
+#define  YT921X_MIB_DATA_TX_PKT_SZ_256_TO_511	0x70
+#define  YT921X_MIB_DATA_TX_PKT_SZ_512_TO_1023	0x74
+#define  YT921X_MIB_DATA_TX_PKT_SZ_1024_TO_1518	0x78
+#define  YT921X_MIB_DATA_TX_PKT_SZ_1519_TO_MAX	0x7c
+
+/* 0x80: unused */
+#define  YT921X_MIB_DATA_TX_GOOD_BYTES		0x84
+/* 0x88: 64 bytes */
+#define  YT921X_MIB_DATA_TX_COLLISION		0x8c
+
+#define  YT921X_MIB_DATA_TX_EXCESSIVE_COLLISION	0x90
+#define  YT921X_MIB_DATA_TX_MULTIPLE_COLLISION	0x94
+#define  YT921X_MIB_DATA_TX_SINGLE_COLLISION	0x98
+#define  YT921X_MIB_DATA_TX_PKT			0x9c
+
+#define  YT921X_MIB_DATA_TX_DEFERRED		0xa0
+#define  YT921X_MIB_DATA_TX_LATE_COLLISION	0xa4
+#define  YT921X_MIB_DATA_RX_OAM			0xa8
+#define  YT921X_MIB_DATA_TX_OAM			0xac
 
 #define YT921X_EDATA_CTRL		0xe0000
 #define  YT921X_EDATA_CTRL_ADDR_M		GENMASK(15, 8)
-- 
2.51.0

Re: [PATCH net-next v2 0/2] net: dsa: yt921x: Fix parsing MIB attributes

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Wed, 26 Nov 2025 16:40:18 +0800 you wrote:
> v1: https://lore.kernel.org/r/20251118091237.2208994-1-mmyangfl@gmail.com
>   - reword commit message and add a fixes tag
>   - add #defines for each MIB location
> 
> David Yang (2):
>   net: dsa: yt921x: Fix parsing MIB attributes
>   net: dsa: yt921x: Use macros for MIB locations
> 
> [...]

Here is the summary with links:
  - [net-next,v2,1/2] net: dsa: yt921x: Fix parsing MIB attributes
    https://git.kernel.org/netdev/net-next/c/510026a39849
  - [net-next,v2,2/2] net: dsa: yt921x: Use macros for MIB locations
    https://git.kernel.org/netdev/net-next/c/fbce7b36c8c6

You are awesome, thank you!
-- 
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