netdev - [net-next PATCH v2 04/11] net: phy: Add identifier for fbnic PMA and use it to skip initial reset

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Message-ID: 
 <176218922469.2759873.11916903841868552104.stgit@ahduyck-xeon-server.home.arpa>
Date: Mon, 03 Nov 2025 09:00:24 -0800
From: Alexander Duyck <alexander.duyck@...il.com>
To: netdev@...r.kernel.org
Cc: kuba@...nel.org, kernel-team@...a.com, andrew+netdev@...n.ch,
 hkallweit1@...il.com, linux@...linux.org.uk, pabeni@...hat.com,
 davem@...emloft.net
Subject: [net-next PATCH v2 04/11] net: phy: Add identifier for fbnic PMA and
 use it to skip initial reset

From: Alexander Duyck <alexanderduyck@...com>

The fbnic driver is planning to make use of the XPCS driver to enable
support for PCS and better integration with phylink. To do this though we
will need to enable several workarounds since the PMA/PMD interface for
fbnic is likely to be unique since it is a mix of two different vendor
products with a unique wrapper around the IP.

As such I have generated a PHY identifier based on IEEE 802.3-2022
22.2.4.3.1 using the OUI belonging to Meta Platforms and used with our
NICs. Using this we will provide it as the PHY ID via the SW based MDIO
interface so that the fbnic device can be identified and necessary
workarounds enabled in the XPCS driver.

As an initial workaround this change adds an exception so that soft_reset
is not set when the driver is initially bound to the PCS.

Signed-off-by: Alexander Duyck <alexanderduyck@...com>
---
 drivers/net/pcs/pcs-xpcs.c   |    3 ++-
 include/linux/pcs/pcs-xpcs.h |    2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
index fde9d9299756..a65a7474e490 100644
--- a/drivers/net/pcs/pcs-xpcs.c
+++ b/drivers/net/pcs/pcs-xpcs.c
@@ -1554,7 +1554,8 @@ static struct dw_xpcs *xpcs_create(struct mdio_device *mdiodev)

 	xpcs_get_interfaces(xpcs, xpcs->pcs.supported_interfaces);

-	if (xpcs->info.pma == WX_TXGBE_XPCS_PMA_10G_ID)
+	if (xpcs->info.pma == WX_TXGBE_XPCS_PMA_10G_ID ||
+	    xpcs->info.pma == MP_FBNIC_XPCS_PMA_100G_ID)
 		xpcs->pcs.poll = false;
 	else
 		xpcs->need_reset = true;
diff --git a/include/linux/pcs/pcs-xpcs.h b/include/linux/pcs/pcs-xpcs.h
index 4cf6bd611e5a..36073f7b6bb4 100644
--- a/include/linux/pcs/pcs-xpcs.h
+++ b/include/linux/pcs/pcs-xpcs.h
@@ -39,6 +39,8 @@ enum dw_xpcs_pma_id {
 	DW_XPCS_PMA_GEN5_10G_ID,
 	DW_XPCS_PMA_GEN5_12G_ID,
 	WX_TXGBE_XPCS_PMA_10G_ID = 0xfc806000,
+	/* Meta Platforms OUI 88:25:08, model 0, revision 0 */
+	MP_FBNIC_XPCS_PMA_100G_ID = 0x46904000,
 };

 struct dw_xpcs_info {