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Date:   Sun, 12 Nov 2023 19:27:50 +0800
From:   Jie Luo <quic_luoj@...cinc.com>
To:     Vladimir Oltean <olteanv@...il.com>
CC:     Maxime Chevallier <maxime.chevallier@...tlin.com>,
        <andrew@...n.ch>, <hkallweit1@...il.com>, <linux@...linux.org.uk>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] net: phy: at803x: add QCA8084 ethernet phy support



On 11/12/2023 6:54 AM, Vladimir Oltean wrote:
> On Fri, Nov 10, 2023 at 05:56:09PM +0800, Jie Luo wrote:
>>>>>>>> What I understand from this is that this PHY can be used either as a
>>>>>>>> switch, in which case port 4 would be connected to the host interface
>>>>>>>> at up to 2.5G, or as a quad-phy, but since it uses QUSGMII the link
>>>>>>>> speed would be limited to 1G per-port, is that correct ?
>>>>>>>
>>>>>>> When the PHY works on the interface mode QUSGMII for quad-phy, all 4
>>>>>>> PHYs can support to the max link speed 2.5G, actually the PHY can
>>>>>>> support to max link speed 2.5G for all supported interface modes
>>>>>>> including qusgmii and sgmii.
>>>>>>
>>>>>> I'm a bit confused then, as the USGMII spec says that Quad USGMII really
>>>>>> is for quad 10/100/1000 speeds, using 10b/8b encoding.
>>>>>>
>>>>>> Aren't you using the USXGMII mode instead, which can convey 4 x 2.5Gbps
>>>>>>     with 66b/64b encoding ?
>>>>>
>>>>> Hi Maxime,
>>>>> Yes, for quad PHY mode, it is using 66b/64 encoding.
>>>>>
>>>>> it seems that PHY_INTERFACE_MODE_USXGMII is for single port,
>>>>> so i take the interface name PHY_INTERFACE_MODE_QUSGMII for
>>>>> quad PHYs here.
>>>>>
>>>>> can we apply PHY_INTERFACE_MODE_USXGMII to quad PHYs in this
>>>>> case(qca8084 quad PHY mode)?
>>>>>
>>>>> Thanks,
>>>>> Jie.
>>>>
>>>> one more thing, if we use the PHY_INTERFACE_MODE_USXGMII for
>>>> the quad PHY here, the MAC serdes can't distinguish the actual
>>>> mode PHY_INTERFACE_MODE_USXGMII and 10G-QXGMII(qca8084 quad phy mode),
>>>> the MAC serdes has the different configurations for usxgmii(10g single
>>>> port) and qxsgmii(quad PHY).
>>>
>>> Yes you do need a way to know which mode to use, what I'm wondering is
>>> that the usxgmii spec actually defines something like 9 different modes
>>> ( 1/2/4/8 ports, with a total bandwidth ranging from 2.5Gbps to 20 Gbps
>>> ), should we define a phy mode for all of these variants, or should we
>>> have another way of getting the mode variant (like, saying I want to
>>> use usxgmii, in 4 ports mode, with the serdes at 10.3125Gbps).
>>>
>>> That being said, QUSGMII already exists to define a specific variant of
>>> USGMII, so maybe adding 10G-QXGMII is fine...
>>
>> Yes, Maxime, I agree with this solution, the name 10G-QXGMII is exactly
>> the working mode of qca8084 quad phy mode.
> 
> FWIW, NXP has these 2 patches in its trees. One day I was going to make
> an attempt at upstreaming them, but the Aquantia PHY driver is a bit of
> a sticky topic since I could find no way to distinguish between the
> single-port and multi-port variants of USXGMII in this PHY IP, and the
> AQR412 uses a multi-port mode which is now treated as USXGMII by Linux.
> 
> Anyway, if you do make progress with this ahead of me, please be aware
> that these patches exist, and I would appreciate if you tried to keep
> the name as "10g-qxgmii" so that I don't have to modify the (downstream)
> device trees again :)
> 
>  From 8f4c8227362bb7acad09cd756390f1efd3311395 Mon Sep 17 00:00:00 2001
> From: Vladimir Oltean <vladimir.oltean@....com>
> Date: Fri, 6 Oct 2023 23:42:35 +0300
> Subject: [PATCH] net: dsa: felix: introduce phy-mode = "10g-qxgmii" to replace
>   "usxgmii"
> 
> The "USXGMII" mode that the Felix switch ports support on LS1028A is not
> quite USXGMII, it is defined by the USXGMII multiport specification
> document as 10G-QXGMII. 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.
> 
> This change is needed in preparation for the lynx-10g driver on LS1028A,
> which will make a more clear distinction between usxgmii (supported on
> lane 0) and 10g-qxgmii (supported on lane 1). These protocols have their
> configuration in different PCCR registers (PCCRB vs PCCR9).
> 
> We touch the entire kernel side: the phylib core, phylink, the Felix
> switch driver, the Lynx PCS and the AQR412 driver. The existing
> LS1028A-QDS device trees will continue to work with "usxgmii", and will
> be updated to "10g-qxgmii" as a separate patch.

Sure Vladimir, Thanks for sharing this patch.

BTW, When do you upstream this patch? or Maybe you can upstream the
separate patch for introducing the new interface mode 10g-qxgmii 
firstly? if that, i can also update qca8084 phy driver based on
your patch.

> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> ---
>   .../bindings/net/ethernet-controller.yaml         |  1 +
>   Documentation/networking/phy.rst                  |  6 ++++++
>   drivers/net/dsa/ocelot/felix.c                    |  1 +
>   drivers/net/dsa/ocelot/felix.h                    |  3 ++-
>   drivers/net/dsa/ocelot/felix_vsc9959.c            |  3 ++-
>   drivers/net/pcs/pcs-lynx.c                        |  8 ++++++--
>   drivers/net/phy/aquantia_main.c                   | 15 +++++++++++++++
>   drivers/net/phy/phy-core.c                        |  1 +
>   drivers/net/phy/phylink.c                         | 12 ++++++++++--
>   include/linux/phy.h                               |  4 ++++
>   include/linux/phylink.h                           |  1 +
>   11 files changed, 49 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/ethernet-controller.yaml b/Documentation/devicetree/bindings/net/ethernet-controller.yaml
> index 9f6a5ccbcefe..044880d804db 100644
> --- a/Documentation/devicetree/bindings/net/ethernet-controller.yaml
> +++ b/Documentation/devicetree/bindings/net/ethernet-controller.yaml
> @@ -104,6 +104,7 @@ properties:
>         - usxgmii
>         - 10gbase-r
>         - 25gbase-r
> +      - 10g-qxgmii
>   
>     phy-mode:
>       $ref: "#/properties/phy-connection-type"
> 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/dsa/ocelot/felix.c b/drivers/net/dsa/ocelot/felix.c
> index 9a3e5ec16972..17fa31b58be4 100644
> --- a/drivers/net/dsa/ocelot/felix.c
> +++ b/drivers/net/dsa/ocelot/felix.c
> @@ -1232,6 +1232,7 @@ static const u32 felix_phy_match_table[PHY_INTERFACE_MODE_MAX] = {
>   	[PHY_INTERFACE_MODE_SGMII] = OCELOT_PORT_MODE_SGMII,
>   	[PHY_INTERFACE_MODE_QSGMII] = OCELOT_PORT_MODE_QSGMII,
>   	[PHY_INTERFACE_MODE_USXGMII] = OCELOT_PORT_MODE_USXGMII,
> +	[PHY_INTERFACE_MODE_10G_QXGMII] = OCELOT_PORT_MODE_10G_QXGMII,
>   	[PHY_INTERFACE_MODE_1000BASEX] = OCELOT_PORT_MODE_1000BASEX,
>   	[PHY_INTERFACE_MODE_2500BASEX] = OCELOT_PORT_MODE_2500BASEX,
>   };
> diff --git a/drivers/net/dsa/ocelot/felix.h b/drivers/net/dsa/ocelot/felix.h
> index 1d4befe7cfe8..4cf849e5782f 100644
> --- a/drivers/net/dsa/ocelot/felix.h
> +++ b/drivers/net/dsa/ocelot/felix.h
> @@ -12,8 +12,9 @@
>   #define OCELOT_PORT_MODE_SGMII		BIT(1)
>   #define OCELOT_PORT_MODE_QSGMII		BIT(2)
>   #define OCELOT_PORT_MODE_2500BASEX	BIT(3)
> -#define OCELOT_PORT_MODE_USXGMII	BIT(4)
> +#define OCELOT_PORT_MODE_USXGMII	BIT(4) /* compatibility */
>   #define OCELOT_PORT_MODE_1000BASEX	BIT(5)
> +#define OCELOT_PORT_MODE_10G_QXGMII	BIT(6)
>   
>   struct device_node;
>   
> diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c b/drivers/net/dsa/ocelot/felix_vsc9959.c
> index 3c5509e75a54..8ae9c2e340ab 100644
> --- a/drivers/net/dsa/ocelot/felix_vsc9959.c
> +++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
> @@ -34,7 +34,8 @@
>   					 OCELOT_PORT_MODE_QSGMII | \
>   					 OCELOT_PORT_MODE_1000BASEX | \
>   					 OCELOT_PORT_MODE_2500BASEX | \
> -					 OCELOT_PORT_MODE_USXGMII)
> +					 OCELOT_PORT_MODE_USXGMII | \
> +					 OCELOT_PORT_MODE_10G_QXGMII)
>   
>   static const u32 vsc9959_port_modes[VSC9959_NUM_PORTS] = {
>   	VSC9959_PORT_MODE_SERDES,
> diff --git a/drivers/net/pcs/pcs-lynx.c b/drivers/net/pcs/pcs-lynx.c
> index 7e1e8f61f043..f3ab17ef4e31 100644
> --- a/drivers/net/pcs/pcs-lynx.c
> +++ b/drivers/net/pcs/pcs-lynx.c
> @@ -95,6 +95,7 @@ static void lynx_pcs_get_state(struct phylink_pcs *pcs,
>   		lynx_pcs_get_state_2500basex(lynx->mdio, state);
>   		break;
>   	case PHY_INTERFACE_MODE_USXGMII:
> +	case PHY_INTERFACE_MODE_10G_QXGMII:
>   		lynx_pcs_get_state_usxgmii(lynx->mdio, state);
>   		break;
>   	case PHY_INTERFACE_MODE_10GBASER:
> @@ -151,6 +152,7 @@ static int lynx_pcs_config_giga(struct mdio_device *pcs,
>   }
>   
>   static int lynx_pcs_config_usxgmii(struct mdio_device *pcs,
> +				   phy_interface_t interface,
>   				   const unsigned long *advertising,
>   				   unsigned int neg_mode)
>   {
> @@ -158,7 +160,8 @@ static int lynx_pcs_config_usxgmii(struct mdio_device *pcs,
>   	int addr = pcs->addr;
>   
>   	if (neg_mode != PHYLINK_PCS_NEG_INBAND_ENABLED) {
> -		dev_err(&pcs->dev, "USXGMII only supports in-band AN for now\n");
> +		dev_err(&pcs->dev, "%s only supports in-band AN for now\n",
> +			phy_modes(interface));
>   		return -EOPNOTSUPP;
>   	}
>   
> @@ -189,7 +192,8 @@ static int lynx_pcs_config(struct phylink_pcs *pcs, unsigned int neg_mode,
>   		}
>   		break;
>   	case PHY_INTERFACE_MODE_USXGMII:
> -		return lynx_pcs_config_usxgmii(lynx->mdio, advertising,
> +	case PHY_INTERFACE_MODE_10G_QXGMII:
> +		return lynx_pcs_config_usxgmii(lynx->mdio, ifmode, advertising,
>   					       neg_mode);
>   	case PHY_INTERFACE_MODE_10GBASER:
>   	case PHY_INTERFACE_MODE_25GBASER:
> diff --git a/drivers/net/phy/aquantia_main.c b/drivers/net/phy/aquantia_main.c
> index 5fc93bbfbe49..4f5e6575be7b 100644
> --- a/drivers/net/phy/aquantia_main.c
> +++ b/drivers/net/phy/aquantia_main.c
> @@ -512,6 +512,20 @@ static int aqr107_read_status(struct phy_device *phydev)
>   	if (!phydev->link || phydev->autoneg == AUTONEG_DISABLE)
>   		return 0;
>   
> +	/* Quad port PHYs like AQR412 have 4 system interfaces, but they can
> +	 * also be used with a single system interface over which all 4 ports
> +	 * are multiplexed (10G-QXGMII). To the MDIO registers, this mode is
> +	 * indistinguishable from USXGMII (which implies a single 10G port),
> +	 * which is problematic because the detection logic below would
> +	 * overwrite phydev->interface with a wrong value. If the device tree
> +	 * is configured for "10g-qxgmii", always trust that value, since it is
> +	 * very unlikely that the PHY firmware was configured for protocol
> +	 * switching depending on link speed (all USXGMII variants are capable
> +	 * of symbol replication).
> +	 */
> +	if (phydev->interface == PHY_INTERFACE_MODE_10G_QXGMII)
> +		goto skip_iface_detection;
> +
>   	val = phy_read_mmd(phydev, MDIO_MMD_PHYXS, MDIO_PHYXS_VEND_IF_STATUS);
>   	if (val < 0)
>   		return val;
> @@ -546,6 +560,7 @@ static int aqr107_read_status(struct phy_device *phydev)
>   		break;
>   	}
>   
> +skip_iface_detection:
>   	/* Read possibly downshifted rate from vendor register */
>   	return aqr107_read_rate(phydev);
>   }
> diff --git a/drivers/net/phy/phy-core.c b/drivers/net/phy/phy-core.c
> index cfa6f08d8ca3..95222680a82d 100644
> --- a/drivers/net/phy/phy-core.c
> +++ b/drivers/net/phy/phy-core.c
> @@ -142,6 +142,7 @@ 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 3bf923f88494..dd0ac7139aa4 100644
> --- a/drivers/net/phy/phylink.c
> +++ b/drivers/net/phy/phylink.c
> @@ -191,6 +191,7 @@ static unsigned int phylink_pcs_neg_mode(unsigned int mode, phy_interface_t inte
>   	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
> @@ -284,6 +285,7 @@ static int phylink_interface_max_speed(phy_interface_t interface)
>   
>   	case PHY_INTERFACE_MODE_2500BASEX:
>   	case PHY_INTERFACE_MODE_2500SGMII:
> +	case PHY_INTERFACE_MODE_10G_QXGMII:
>   		return SPEED_2500;
>   
>   	case PHY_INTERFACE_MODE_5GBASER:
> @@ -553,7 +555,11 @@ 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:
> @@ -969,6 +975,7 @@ 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:
> @@ -1804,7 +1811,8 @@ 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 184b04422877..0eeeea50d9a2 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.
> @@ -166,6 +167,7 @@ typedef enum {
>   	PHY_INTERFACE_MODE_QUSGMII,
>   	PHY_INTERFACE_MODE_1000BASEKX,
>   	PHY_INTERFACE_MODE_2500SGMII,
> +	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 "qusgmii";
>   	case PHY_INTERFACE_MODE_2500SGMII:
>   		return "sgmii-2500";
> +	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 871db640ceb6..336780e76e34 100644
> --- a/include/linux/phylink.h
> +++ b/include/linux/phylink.h
> @@ -648,6 +648,7 @@ 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:

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