[PATCH net-next v3 0/4] irst series for xpcs based rsfec configuration

[PATCH net-next v3 0/4] irst series for xpcs based rsfec configuration

[mike.marciniszyn]

From: "Mike Marciniszyn (Meta)" <mike.marciniszyn@gmail.com>

The series:
- Fixes an addr validation error
- Adds MDIO defines associated with RS-FEC
- consolidates the handling of the boilerplat ID registers
  into a routine to report id'ish registers and reduces the lines
  of code across the entire set of c45 routines.
- adds PMA read/write routines

https://lore.kernel.org/all/20260428172810.175077-2-mike.marciniszyn@gmail.com/
has been put back into the based on
https://lore.kernel.org/all/9ec11642-8035-419c-a896-52f902020bb8@lunn.ch/

pcs reads for DEVS1 and DEVS2 cleaned up 2/3

Mike Marciniszyn (Meta) (3):
  net: eth: fbnic: Fix addr validation in pcs write
  net: mdio: Add support for RSFEC Control register for PMA
  net: eth: fbnic: Consolidate register reads for ids and devs
  net: eth: fbnic: Add pma read and write access

 drivers/net/ethernet/meta/fbnic/fbnic_csr.h  |   1 +
 drivers/net/ethernet/meta/fbnic/fbnic_mdio.c | 137 +++++++++++++++----
 include/uapi/linux/mdio.h                    |  10 ++
 3 files changed, 123 insertions(+), 25 deletions(-)

--
2.43.0

[PATCH net-next v3 1/4] net: eth: fbnic: Fix addr validation in pcs write

[mike.marciniszyn]

From: "Mike Marciniszyn (Meta)" <mike.marciniszyn@gmail.com>

The DW IP has two distinct PCS address ranges cooresponding
to the C45 PCS registers.

The shim translates the PCS addr/regno into specific CSR writes
into one of those two zero-relative.

This patch fixes a one off in the test that could allow an invalid
CSR write if an addr == 2 was called.

This patch contains a fix for addr validation in fbnic_mdio_write_pcs()
to only return actual CSR reads for addr 0 and 1.

There are as of yet, no real impact for the bug as no PCS writes are
not yet present.

Signed-off-by: Mike Marciniszyn (Meta) <mike.marciniszyn@gmail.com>
---
v3:
  - put back into the series based on https://lore.kernel.org/all/9ec11642-8035-419c-a896-52f902020bb8@lunn.ch/
  - revised commit message will additional details
v2:
  - omitted from patch series
v1: https://lore.kernel.org/all/20260428172810.175077-2-mike.marciniszyn@gmail.com/

 drivers/net/ethernet/meta/fbnic/fbnic_mdio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_mdio.c b/drivers/net/ethernet/meta/fbnic/fbnic_mdio.c
index 709041f7fc43..d6a124889f52 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_mdio.c
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_mdio.c
@@ -125,7 +125,7 @@ fbnic_mdio_write_pcs(struct fbnic_dev *fbd, int addr, int regnum, u16 val)
 		addr, regnum, val);
 
 	/* Allow access to both halves of PCS for 50R2 config */
-	if (addr > 2)
+	if (addr >= 2)
 		return;
 
 	/* Skip write for reserved registers */
-- 
2.43.0

[PATCH net-next v3 2/4] net: mdio: Add support for RSFEC Control register for PMA

[mike.marciniszyn]

From: "Mike Marciniszyn (Meta)" <mike.marciniszyn@gmail.com>

Add the constants associated with RS-FEC configuration
and status as well as the indicated separated bits for
DEVS1 to convey a separated PMA.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Mike Marciniszyn (Meta) <mike.marciniszyn@gmail.com>
---
v3:
  - no changes
v2:https://lore.kernel.org/all/20260430150802.3521-2-mike.marciniszyn@gmail.com/
  - Added Reviewed-by
v1: https://lore.kernel.org/all/20260428172810.175077-3-mike.marciniszyn@gmail.com/
  - initial revision

 include/uapi/linux/mdio.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/uapi/linux/mdio.h b/include/uapi/linux/mdio.h
index 8d769f100de6..b2541c948fc1 100644
--- a/include/uapi/linux/mdio.h
+++ b/include/uapi/linux/mdio.h
@@ -23,6 +23,10 @@
 #define MDIO_MMD_DTEXS		5	/* DTE Extender Sublayer */
 #define MDIO_MMD_TC		6	/* Transmission Convergence */
 #define MDIO_MMD_AN		7	/* Auto-Negotiation */
+#define MDIO_MMD_SEP_PMA1	8	/* Separated PMA (1) */
+#define MDIO_MMD_SEP_PMA2	9	/* Separated PMA (2) */
+#define MDIO_MMD_SEP_PMA3	10	/* Separated PMA (3) */
+#define MDIO_MMD_SEP_PMA4	11	/* Separated PMA (4) */
 #define MDIO_MMD_POWER_UNIT	13	/* PHY Power Unit */
 #define MDIO_MMD_C22EXT		29	/* Clause 22 extension */
 #define MDIO_MMD_VEND1		30	/* Vendor specific 1 */
@@ -63,6 +67,8 @@
 					 * Lanes B-D are numbered 134-136. */
 #define MDIO_PMA_10GBR_FSRT_CSR	147	/* 10GBASE-R fast retrain status and control */
 #define MDIO_PMA_10GBR_FECABLE	170	/* 10GBASE-R FEC ability */
+#define MDIO_PMA_RSFEC_CTRL	200	/* RSFEC control */
+#define MDIO_PMA_RSFEC_LANE_MAP	206	/* RSFEC lane mapping */
 #define MDIO_PCS_10GBX_STAT1	24	/* 10GBASE-X PCS status 1 */
 #define MDIO_PCS_10GBRT_STAT1	32	/* 10GBASE-R/-T PCS status 1 */
 #define MDIO_PCS_10GBRT_STAT2	33	/* 10GBASE-R/-T PCS status 2 */
@@ -175,6 +181,10 @@
 #define MDIO_DEVS_DTEXS			MDIO_DEVS_PRESENT(MDIO_MMD_DTEXS)
 #define MDIO_DEVS_TC			MDIO_DEVS_PRESENT(MDIO_MMD_TC)
 #define MDIO_DEVS_AN			MDIO_DEVS_PRESENT(MDIO_MMD_AN)
+#define MDIO_DEVS_SEP_PMA1		MDIO_DEVS_PRESENT(MDIO_MMD_SEP_PMA1)
+#define MDIO_DEVS_SEP_PMA2		MDIO_DEVS_PRESENT(MDIO_MMD_SEP_PMA2)
+#define MDIO_DEVS_SEP_PMA3		MDIO_DEVS_PRESENT(MDIO_MMD_SEP_PMA3)
+#define MDIO_DEVS_SEP_PMA4		MDIO_DEVS_PRESENT(MDIO_MMD_SEP_PMA4)
 #define MDIO_DEVS_C22EXT		MDIO_DEVS_PRESENT(MDIO_MMD_C22EXT)
 #define MDIO_DEVS_VEND1			MDIO_DEVS_PRESENT(MDIO_MMD_VEND1)
 #define MDIO_DEVS_VEND2			MDIO_DEVS_PRESENT(MDIO_MMD_VEND2)
-- 
2.43.0

[PATCH net-next v3 3/4] net: eth: fbnic: Consolidate register reads for ids and devs

[mike.marciniszyn]

From: "Mike Marciniszyn (Meta)" <mike.marciniszyn@gmail.com>

Consolidate the register reads for boiler plate registers
to reduce LOC and cleanup pcs reads for DEVS1 to
fetch overrides for reserved bits that the hardware does not
return.

Signed-off-by: Mike Marciniszyn (Meta) <mike.marciniszyn@gmail.com>
---
v3:
  - no changes
v2: https://lore.kernel.org/all/20260430150802.3521-3-mike.marciniszyn@gmail.com/
  - Restore pcs register read for DEVS2
  - read pcs DEVS1 overrides and or into return
v1: https://lore.kernel.org/all/20260428172810.175077-4-mike.marciniszyn@gmail.com/

 drivers/net/ethernet/meta/fbnic/fbnic_mdio.c | 64 ++++++++++++--------
 1 file changed, 40 insertions(+), 24 deletions(-)

diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_mdio.c b/drivers/net/ethernet/meta/fbnic/fbnic_mdio.c
index d6a124889f52..d794f5d8d84f 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_mdio.c
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_mdio.c
@@ -11,6 +11,26 @@
 #define FBNIC_PCS_VENDOR	BIT(9)
 #define FBNIC_PCS_ZERO_MASK	(DW_VENDOR - FBNIC_PCS_VENDOR)
 
+static int
+fbnic_mdio_ids(int id, int regnum)
+{
+	/* return correct IDs */
+	switch (regnum) {
+	case MDIO_DEVID1:
+		return id >> 16;
+	case MDIO_DEVID2:
+		return id & 0xffff;
+	case MDIO_DEVS1:
+		return MDIO_DEVS_SEP_PMA1 | MDIO_DEVS_PMAPMD | MDIO_DEVS_PCS;
+	case MDIO_DEVS2:
+		return 0;
+	case MDIO_STAT2:
+		return MDIO_STAT2_DEVPRST_VAL;
+	}
+
+	return 0;
+}
+
 static int
 fbnic_mdio_read_pmd(struct fbnic_dev *fbd, int addr, int regnum)
 {
@@ -29,18 +49,6 @@ fbnic_mdio_read_pmd(struct fbnic_dev *fbd, int addr, int regnum)
 	}
 
 	switch (regnum) {
-	case MDIO_DEVID1:
-		ret = MP_FBNIC_XPCS_PMA_100G_ID >> 16;
-		break;
-	case MDIO_DEVID2:
-		ret = MP_FBNIC_XPCS_PMA_100G_ID & 0xffff;
-		break;
-	case MDIO_DEVS1:
-		ret = MDIO_DEVS_PMAPMD | MDIO_DEVS_PCS;
-		break;
-	case MDIO_STAT2:
-		ret = MDIO_STAT2_DEVPRST_VAL;
-		break;
 	case MDIO_PMA_RXDET:
 		/* If training isn't complete default to 0 */
 		if (fbd->pmd_state != FBNIC_PMD_SEND_DATA)
@@ -51,6 +59,7 @@ fbnic_mdio_read_pmd(struct fbnic_dev *fbd, int addr, int regnum)
 		       (MDIO_PMD_RXDET_1 / FBNIC_AUI_MODE_R2));
 		break;
 	default:
+		ret = fbnic_mdio_ids(MP_FBNIC_XPCS_PMA_100G_ID, regnum);
 		break;
 	}
 
@@ -64,7 +73,7 @@ fbnic_mdio_read_pmd(struct fbnic_dev *fbd, int addr, int regnum)
 static int
 fbnic_mdio_read_pcs(struct fbnic_dev *fbd, int addr, int regnum)
 {
-	int ret, offset = 0;
+	int ret, offset = 0, overrides = 0;
 
 	/* We will need access to both PCS instances to get config info */
 	if (addr >= 2)
@@ -75,18 +84,25 @@ fbnic_mdio_read_pcs(struct fbnic_dev *fbd, int addr, int regnum)
 		return 0;
 
 	/* Intercept and return correct ID for PCS */
-	if (regnum == MDIO_DEVID1)
-		return DW_XPCS_ID >> 16;
-	if (regnum == MDIO_DEVID2)
-		return DW_XPCS_ID & 0xffff;
-	if (regnum == MDIO_DEVS1)
-		return MDIO_DEVS_PMAPMD | MDIO_DEVS_PCS;
-
-	/* Swap vendor page bit for FBNIC PCS vendor page bit */
-	if (regnum & DW_VENDOR)
-		offset ^= DW_VENDOR | FBNIC_PCS_VENDOR;
+	switch (regnum) {
+	case MDIO_DEVID1 ... MDIO_DEVID2:
+		ret = fbnic_mdio_ids(DW_XPCS_ID, regnum);
+		break;
+	case MDIO_DEVS1:
+		/* DW IP returns MDIO_DEVS_SEP_PMA1, MDIO_DEVS_PMAPMD,
+		 * and MDIO_DEVS_PCS as 0
+		 */
+		overrides = fbnic_mdio_ids(DW_XPCS_ID, regnum);
+		fallthrough;
+	default:
+		/* Swap vendor page bit for FBNIC PCS vendor page bit */
+		if (regnum & DW_VENDOR)
+			offset ^= DW_VENDOR | FBNIC_PCS_VENDOR;
 
-	ret = fbnic_rd32(fbd, FBNIC_PCS_PAGE(addr) + (regnum ^ offset));
+		ret = fbnic_rd32(fbd, FBNIC_PCS_PAGE(addr) + (regnum ^ offset));
+		ret |= overrides;
+		break;
+	}
 
 	dev_dbg(fbd->dev,
 		"SWMII PCS Rd: Addr: %d RegNum: %d Value: 0x%04x\n",
-- 
2.43.0

[PATCH net-next v3 4/4] net: eth: fbnic: Add pma read and write access

[mike.marciniszyn]

From: "Mike Marciniszyn (Meta)" <mike.marciniszyn@gmail.com>

Document the MDIO interface topology with an ASCII diagram
showing the MAC, PCS (MMD 3), FEC, Separated PMA (MMD 8), and PMD
(MMD 1) blocks and their interconnects. The diagram illustrates how
4 lanes connect the MAC through PCS, FEC, and PMA, then narrow to
2 lanes at the PMD.

The c45 read and write routines are enhanced to support
read and write of the separated PMA for the fbnic.

Co-developed-by: Alexander Duyck <alexanderduyck@fb.com>
Signed-off-by: Alexander Duyck <alexanderduyck@fb.com>
Signed-off-by: Mike Marciniszyn (Meta) <mike.marciniszyn@gmail.com>
---
v2: https://lore.kernel.org/all/20260430150802.3521-4-mike.marciniszyn@gmail.com/
  - no changes
v1: https://lore.kernel.org/all/20260428172810.175077-5-mike.marciniszyn@gmail.com/

 drivers/net/ethernet/meta/fbnic/fbnic_csr.h  |  1 +
 drivers/net/ethernet/meta/fbnic/fbnic_mdio.c | 71 ++++++++++++++++++++
 2 files changed, 72 insertions(+)

diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_csr.h b/drivers/net/ethernet/meta/fbnic/fbnic_csr.h
index 81794bd326e1..64b958df7774 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_csr.h
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_csr.h
@@ -805,6 +805,7 @@ enum {
 #define FBNIC_CSR_END_PCS		0x10668 /* CSR section delimiter */
 
 #define FBNIC_CSR_START_RSFEC		0x10800 /* CSR section delimiter */
+#define FBNIC_RSFEC_CONTROL(n)	(0x10800 + 8 * (n))	/* 0x42000 + 32*n */
 
 /* We have 4 RSFEC engines present in our part, however we are only using 1.
  * As such only CCW(0) and NCCW(0) will never be non-zero and the other
diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_mdio.c b/drivers/net/ethernet/meta/fbnic/fbnic_mdio.c
index d794f5d8d84f..fe3a4ce88413 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_mdio.c
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_mdio.c
@@ -7,6 +7,25 @@
 #include "fbnic.h"
 #include "fbnic_netdev.h"
 
+/* fbnic MDIO Interface Layout
+ *
+ *        +-------------------+
+ *        |        MAC        |
+ *        +-------------------+
+ *            |   |   |   |  <-- 25GMII, 50GMII, or CGMII
+ *        +-------------------+
+ *  MMD 3 |        PCS        |
+ *        +-------------------+
+ *        |        FEC        |
+ *        +-------------------+
+ *  MMD 8 |  Separated PMA    |
+ *        +-------------------+
+ *              |       |     <-- PMD Service Interface
+ *        +-------------------+
+ *  MMD 1 |        PMD        |
+ *        +-------------------+
+ */
+
 #define DW_VENDOR		BIT(15)
 #define FBNIC_PCS_VENDOR	BIT(9)
 #define FBNIC_PCS_ZERO_MASK	(DW_VENDOR - FBNIC_PCS_VENDOR)
@@ -111,6 +130,32 @@ fbnic_mdio_read_pcs(struct fbnic_dev *fbd, int addr, int regnum)
 	return ret;
 }
 
+static int
+fbnic_mdio_read_pma(struct fbnic_dev *fbd, int addr, int regnum)
+{
+	int ret = 0;
+
+	/* We will need access to both PMA instances to get config info */
+	if (addr >= 2)
+		return 0;
+
+	switch (regnum) {
+	case MDIO_PMA_RSFEC_CTRL ... MDIO_PMA_RSFEC_LANE_MAP:
+		ret = fbnic_rd32(fbd, FBNIC_RSFEC_CONTROL(addr) +
+				 regnum - MDIO_PMA_RSFEC_CTRL);
+		break;
+	default:
+		ret = fbnic_mdio_ids(MP_FBNIC_XPCS_PMA_100G_ID, regnum);
+		break;
+	}
+
+	dev_dbg(fbd->dev,
+		"SWMII PMA Rd: Addr: %d RegNum: %d Value: 0x%04x\n",
+		addr, regnum, ret);
+
+	return ret;
+}
+
 static int
 fbnic_mdio_read_c45(struct mii_bus *bus, int addr, int devnum, int regnum)
 {
@@ -122,6 +167,9 @@ fbnic_mdio_read_c45(struct mii_bus *bus, int addr, int devnum, int regnum)
 	if (devnum == MDIO_MMD_PCS)
 		return fbnic_mdio_read_pcs(fbd, addr, regnum);
 
+	if (devnum == MDIO_MMD_SEP_PMA1)
+		return fbnic_mdio_read_pma(fbd, addr, regnum);
+
 	return 0;
 }
 
@@ -155,6 +203,26 @@ fbnic_mdio_write_pcs(struct fbnic_dev *fbd, int addr, int regnum, u16 val)
 	fbnic_wr32(fbd, FBNIC_PCS_PAGE(addr) + regnum, val);
 }
 
+static void
+fbnic_mdio_write_pma(struct fbnic_dev *fbd, int addr, int regnum, u16 val)
+{
+	dev_dbg(fbd->dev,
+		"SWMII PMA Wr: Addr: %d RegNum: %d Value: 0x%04x\n",
+		addr, regnum, val);
+
+	if (addr >= 2)
+		return;
+
+	switch (regnum) {
+	case MDIO_PMA_RSFEC_CTRL ... MDIO_PMA_RSFEC_LANE_MAP:
+		fbnic_wr32(fbd, FBNIC_RSFEC_CONTROL(addr) +
+				regnum - MDIO_PMA_RSFEC_CTRL, val);
+		break;
+	default:
+		break;
+	}
+}
+
 static int
 fbnic_mdio_write_c45(struct mii_bus *bus, int addr, int devnum,
 		     int regnum, u16 val)
@@ -167,6 +235,9 @@ fbnic_mdio_write_c45(struct mii_bus *bus, int addr, int devnum,
 	if (devnum == MDIO_MMD_PCS)
 		fbnic_mdio_write_pcs(fbd, addr, regnum, val);
 
+	if (devnum == MDIO_MMD_SEP_PMA1)
+		fbnic_mdio_write_pma(fbd, addr, regnum, val);
+
 	return 0;
 }
 
-- 
2.43.0

Re: [PATCH net-next v3 0/4] irst series for xpcs based rsfec configuration

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (main)
by Paolo Abeni <pabeni@redhat.com>:

On Mon,  4 May 2026 09:58:11 -0400 you wrote:
> From: "Mike Marciniszyn (Meta)" <mike.marciniszyn@gmail.com>
> 
> The series:
> - Fixes an addr validation error
> - Adds MDIO defines associated with RS-FEC
> - consolidates the handling of the boilerplat ID registers
>   into a routine to report id'ish registers and reduces the lines
>   of code across the entire set of c45 routines.
> - adds PMA read/write routines
> 
> [...]

Here is the summary with links:
  - [net-next,v3,1/4] net: eth: fbnic: Fix addr validation in pcs write
    (no matching commit)
  - [net-next,v3,2/4] net: mdio: Add support for RSFEC Control register for PMA
    https://git.kernel.org/netdev/net-next/c/ca283942e5b9
  - [net-next,v3,3/4] net: eth: fbnic: Consolidate register reads for ids and devs
    https://git.kernel.org/netdev/net-next/c/d7dbf00b4a55
  - [net-next,v3,4/4] net: eth: fbnic: Add pma read and write access
    https://git.kernel.org/netdev/net-next/c/3877097c3c9e

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html