linux-kernel - Re: [PATCH net-next v1 3/3] r8169: add support for chip RTL9151AS

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Message-ID: <02c00a95-34c6-4b01-8f0a-7dbd113e26ba@gmail.com>
Date: Mon, 12 Jan 2026 23:20:48 +0100
From: Heiner Kallweit <hkallweit1@...il.com>
To: javen <javen_xu@...lsil.com.cn>, nic_swsd@...ltek.com,
 andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, horms@...nel.org
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v1 3/3] r8169: add support for chip RTL9151AS

On 1/12/2026 3:45 AM, javen wrote:
> From: Javen Xu <javen_xu@...lsil.com.cn>
> 
> This patch adds support for chip RTL9151AS. Since lacking of Hardware
> version IDs, we use TX_CONFIG_V2 to recognize RTL9151AS and coming chips.
> rtl_chip_infos_extend is used to store IC information for RTL9151AS and
> coming chips. The TxConfig value between RTL9151AS and RTL9151A is 
> 
> different.
> 
> Signed-off-by: Javen Xu <javen_xu@...lsil.com.cn>
> ---
>  drivers/net/ethernet/realtek/r8169.h      |  3 ++-
>  drivers/net/ethernet/realtek/r8169_main.c | 28 +++++++++++++++++++++--
>  2 files changed, 28 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/realtek/r8169.h b/drivers/net/ethernet/realtek/r8169.h
> index 2c1a0c21af8d..f66c279cbee6 100644
> --- a/drivers/net/ethernet/realtek/r8169.h
> +++ b/drivers/net/ethernet/realtek/r8169.h
> @@ -72,7 +72,8 @@ enum mac_version {
>  	RTL_GIGA_MAC_VER_70,
>  	RTL_GIGA_MAC_VER_80,
>  	RTL_GIGA_MAC_NONE,
> -	RTL_GIGA_MAC_VER_LAST = RTL_GIGA_MAC_NONE - 1
> +	RTL_GIGA_MAC_VER_LAST = RTL_GIGA_MAC_NONE - 1,
> +	RTL_GIGA_MAC_VER_CHECK_EXTEND
>  };
>  
>  struct rtl8169_private;
> diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
> index 9b89bbf67198..164ad6570059 100644
> --- a/drivers/net/ethernet/realtek/r8169_main.c
> +++ b/drivers/net/ethernet/realtek/r8169_main.c
> @@ -95,8 +95,8 @@
>  #define JUMBO_16K	(SZ_16K - VLAN_ETH_HLEN - ETH_FCS_LEN)
>  
>  static const struct rtl_chip_info {
> -	u16 mask;
> -	u16 val;
> +	u32 mask;
> +	u32 val;
>  	enum mac_version mac_version;
>  	const char *name;
>  	const char *fw_name;
> @@ -205,10 +205,20 @@ static const struct rtl_chip_info {
>  	{ 0xfc8, 0x040,	RTL_GIGA_MAC_VER_03, "RTL8110s" },
>  	{ 0xfc8, 0x008,	RTL_GIGA_MAC_VER_02, "RTL8169s" },
>  
> +	/* extend chip version*/
> +	{ 0x7cf, 0x7c8, RTL_GIGA_MAC_VER_CHECK_EXTEND },
> +
>  	/* Catch-all */
>  	{ 0x000, 0x000,	RTL_GIGA_MAC_NONE }
>  };
>  
> +static const struct rtl_chip_info rtl_chip_infos_extend[] = {
> +	{ 0x7fffffff, 0x00000000, RTL_GIGA_MAC_VER_64, "RTL9151AS", FIRMWARE_9151A_1},
> +

Seems all bits except bit 31 are used for chip detection. However register is
named TX_CONFIG_V2, even though only bit 31 is left for actual tx configuration.
Is the register name misleading, or is the mask incorrect?


> +	/* Catch-all */
> +	{ 0x00000000, 0x00000000, RTL_GIGA_MAC_NONE }
> +};
> +
>  static const struct pci_device_id rtl8169_pci_tbl[] = {
>  	{ PCI_VDEVICE(REALTEK,	0x2502) },
>  	{ PCI_VDEVICE(REALTEK,	0x2600) },
> @@ -255,6 +265,8 @@ enum rtl_registers {
>  	IntrStatus	= 0x3e,
>  
>  	TxConfig	= 0x40,
> +	/* Extend version register */
> +	TX_CONFIG_V2	= 0x60b0,
>  #define	TXCFG_AUTO_FIFO			(1 << 7)	/* 8111e-vl */
>  #define	TXCFG_EMPTY			(1 << 11)	/* 8111e-vl */
>  
> @@ -2351,6 +2363,15 @@ static const struct ethtool_ops rtl8169_ethtool_ops = {
>  	.get_eth_ctrl_stats	= rtl8169_get_eth_ctrl_stats,
>  };
>  
> +static const struct rtl_chip_info *rtl8169_get_extend_chip_version(u32 txconfigv2)
> +{
> +	const struct rtl_chip_info *p = rtl_chip_infos_extend;
> +
> +	while ((txconfigv2 & p->mask) != p->val)
> +		p++;
> +	return p;
> +}
> +
>  static const struct rtl_chip_info *rtl8169_get_chip_version(u16 xid, bool gmii)
>  {
>  	/* Chips combining a 1Gbps MAC with a 100Mbps PHY */
> @@ -5543,6 +5564,9 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
>  
>  	/* Identify chip attached to board */
>  	chip = rtl8169_get_chip_version(xid, tp->supports_gmii);
> +
> +	if (chip->mac_version == RTL_GIGA_MAC_VER_CHECK_EXTEND)
> +		chip = rtl8169_get_extend_chip_version(RTL_R32(tp, TX_CONFIG_V2));
>  	if (chip->mac_version == RTL_GIGA_MAC_NONE)
>  		return dev_err_probe(&pdev->dev, -ENODEV,
>  				     "unknown chip XID %03x, contact r8169 maintainers (see MAINTAINERS file)\n",