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net: phy: introduce core support for phy-mode = "10g-qxgmii"

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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>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Vladimir Oltean 2024-06-15 20:00:27 +08:00 committed by Paolo Abeni
parent 041cc86b36
commit 777b8afb81
5 changed files with 20 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
Documentation/networking/phy.rst
View file

@ -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
===========================

1
drivers/net/phy/phy-core.c
View file

@ -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;

9
drivers/net/phy/phylink.c
View file

@ -231,6 +231,7 @@ 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:
@ -500,7 +501,11 @@ 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:
@ -926,6 +931,7 @@ static int phylink_parse_mode(struct phylink *pl,
case PHY_INTERFACE_MODE_5GBASER:
case PHY_INTERFACE_MODE_25GBASER:
case PHY_INTERFACE_MODE_USXGMII:
case PHY_INTERFACE_MODE_10G_QXGMII:
case PHY_INTERFACE_MODE_10GKR:
case PHY_INTERFACE_MODE_10GBASER:
case PHY_INTERFACE_MODE_XLGMII:
@ -1124,6 +1130,7 @@ static 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

4
include/linux/phy.h
View file

@ -128,6 +128,7 @@ 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.
@ -168,6 +169,7 @@ 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;
@ -289,6 +291,8 @@ 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";
}

1
include/linux/phylink.h
View file

@ -654,6 +654,7 @@ 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: