[PATCH v6 1/6] net: phy: introduce core support for phy-mode = "10g-qxgmii"

Luo Jie
2023-11-26T06:08:46Z

From: Vladimir Oltean <vladimir.oltean@nxp.com>

10G-QXGMII is a MAC-to-PHY interface defined by the USXGMII multiport
specification. It uses the same signaling as USXGMII, but it multiplexes
4 ports over the link, resulting in a maximum speed of 2.5G per port.

Some in-tree SoCs like the NXP LS1028A use "usxgmii" when they mean
either the single-port USXGMII or the quad-port 10G-QXGMII variant, and
they could get away just fine with that thus far. But there is a need to
distinguish between the 2 as far as SerDes drivers are concerned.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Luo Jie <quic_luoj@quicinc.com>
---
Documentation/networking/phy.rst | 6 ++++++
drivers/net/phy/phy-core.c | 1 +
drivers/net/phy/phylink.c | 11 +++++++++--
include/linux/phy.h | 4 ++++
include/linux/phylink.h | 2 ++
5 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/Documentation/networking/phy.rst b/Documentation/networking/phy.rst
index 1283240d7620..f64641417c54 100644
--- a/Documentation/networking/phy.rst
+++ b/Documentation/networking/phy.rst
@@ -327,6 +327,12 @@ Some of the interface modes are described below:
This is the Penta SGMII mode, it is similar to QSGMII but it combines 5
SGMII lines into a single link compared to 4 on QSGMII.

+``PHY_INTERFACE_MODE_10G_QXGMII``
+ Represents the 10G-QXGMII PHY-MAC interface as defined by the Cisco USXGMII
+ Multiport Copper Interface document. It supports 4 ports over a 10.3125 GHz
+ SerDes lane, each port having speeds of 2.5G / 1G / 100M / 10M achieved
+ through symbol replication. The PCS expects the standard USXGMII code word.
+
Pause frames / flow control
===========================

diff --git a/drivers/net/phy/phy-core.c b/drivers/net/phy/phy-core.c
index 966c93cbe616..1cd58723d6d0 100644
--- a/drivers/net/phy/phy-core.c
+++ b/drivers/net/phy/phy-core.c
@@ -141,6 +141,7 @@ int phy_interface_num_ports(phy_interface_t interface)
return 1;
case PHY_INTERFACE_MODE_QSGMII:
case PHY_INTERFACE_MODE_QUSGMII:
+ case PHY_INTERFACE_MODE_10G_QXGMII:
return 4;
case PHY_INTERFACE_MODE_PSGMII:
return 5;
diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index c276f9482f78..803251299342 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -218,6 +218,7 @@ static int phylink_interface_max_speed(phy_interface_t interface)
return SPEED_1000;

case PHY_INTERFACE_MODE_2500BASEX:
+ case PHY_INTERFACE_MODE_10G_QXGMII:
return SPEED_2500;

case PHY_INTERFACE_MODE_5GBASER:
@@ -487,7 +488,11 @@ static unsigned long phylink_get_capabilities(phy_interface_t interface,

switch (interface) {
case PHY_INTERFACE_MODE_USXGMII:
- caps |= MAC_10000FD | MAC_5000FD | MAC_2500FD;
+ caps |= MAC_10000FD | MAC_5000FD;
+ fallthrough;
+
+ case PHY_INTERFACE_MODE_10G_QXGMII:
+ caps |= MAC_2500FD;
fallthrough;

case PHY_INTERFACE_MODE_RGMII_TXID:
@@ -905,6 +910,7 @@ static int phylink_parse_mode(struct phylink *pl,
phylink_set(pl->supported, 25000baseSR_Full);
fallthrough;
case PHY_INTERFACE_MODE_USXGMII:
+ case PHY_INTERFACE_MODE_10G_QXGMII:
case PHY_INTERFACE_MODE_10GKR:
case PHY_INTERFACE_MODE_10GBASER:
phylink_set(pl->supported, 10baseT_Half);
@@ -1777,7 +1783,8 @@ static int phylink_bringup_phy(struct phylink *pl, struct phy_device *phy,
if (phy->is_c45 && config.rate_matching == RATE_MATCH_NONE &&
interface != PHY_INTERFACE_MODE_RXAUI &&
interface != PHY_INTERFACE_MODE_XAUI &&
- interface != PHY_INTERFACE_MODE_USXGMII)
+ interface != PHY_INTERFACE_MODE_USXGMII &&
+ interface != PHY_INTERFACE_MODE_10G_QXGMII)
config.interface = PHY_INTERFACE_MODE_NA;
else
config.interface = interface;
diff --git a/include/linux/phy.h b/include/linux/phy.h
index e5f1f41e399c..b4ea3fa172a2 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -125,6 +125,7 @@ extern const int phy_10gbit_features_array[1];
* @PHY_INTERFACE_MODE_10GKR: 10GBASE-KR - with Clause 73 AN
* @PHY_INTERFACE_MODE_QUSGMII: Quad Universal SGMII
* @PHY_INTERFACE_MODE_1000BASEKX: 1000Base-KX - with Clause 73 AN
+ * @PHY_INTERFACE_MODE_10G_QXGMII: 10G-QXGMII - 4 ports over 10G USXGMII
* @PHY_INTERFACE_MODE_MAX: Book keeping
*
* Describes the interface between the MAC and PHY.
@@ -165,6 +166,7 @@ typedef enum {
PHY_INTERFACE_MODE_10GKR,
PHY_INTERFACE_MODE_QUSGMII,
PHY_INTERFACE_MODE_1000BASEKX,
+ PHY_INTERFACE_MODE_10G_QXGMII,
PHY_INTERFACE_MODE_MAX,
} phy_interface_t;

@@ -286,6 +288,8 @@ static inline const char *phy_modes(phy_interface_t interface)
return "100base-x";
case PHY_INTERFACE_MODE_QUSGMII:
return "qusgmii";
+ case PHY_INTERFACE_MODE_10G_QXGMII:
+ return "10g-qxgmii";
default:
return "unknown";
}
diff --git a/include/linux/phylink.h b/include/linux/phylink.h
index 875439ab45de..92bd2726cc8a 100644
--- a/include/linux/phylink.h
+++ b/include/linux/phylink.h
@@ -128,6 +128,7 @@ static inline unsigned int phylink_pcs_neg_mode(unsigned int mode,
case PHY_INTERFACE_MODE_QSGMII:
case PHY_INTERFACE_MODE_QUSGMII:
case PHY_INTERFACE_MODE_USXGMII:
+ case PHY_INTERFACE_MODE_10G_QXGMII:
/* These protocols are designed for use with a PHY which
* communicates its negotiation result back to the MAC via
* inband communication. Note: there exist PHYs that run
@@ -680,6 +681,7 @@ static inline int phylink_get_link_timer_ns(phy_interface_t interface)
case PHY_INTERFACE_MODE_SGMII:
case PHY_INTERFACE_MODE_QSGMII:
case PHY_INTERFACE_MODE_USXGMII:
+ case PHY_INTERFACE_MODE_10G_QXGMII:
return 1600000;

case PHY_INTERFACE_MODE_1000BASEX:
--
2.42.0