linux-kernel - Re: [PATCH net-next] ixgbe: Add 10G-BX support

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Message-ID: <b5dd3a3e-2420-4c7c-b690-3799fac14623@lunn.ch>
Date: Mon, 13 Oct 2025 18:31:58 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Birger Koblitz <mail@...ger-koblitz.de>
Cc: Tony Nguyen <anthony.l.nguyen@...el.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] ixgbe: Add 10G-BX support

> @@ -1678,6 +1679,26 @@ int ixgbe_identify_sfp_module_generic(struct ixgbe_hw *hw)
>  			else
>  				hw->phy.sfp_type =
>  					ixgbe_sfp_type_1g_bx_core1;
> +		/* Support Ethernet 10G-BX, checking the Bit Rate
> +		 * Nominal Value as per SFF-8472 to be 12.5 Gb/s (67h) and
> +		 * Single Mode fibre with at least 1km link length
> +		 */
> +		} else if ((!comp_codes_10g) && (bitrate_nominal == 0x67) &&
> +			   (!(cable_tech & IXGBE_SFF_DA_PASSIVE_CABLE)) &&
> +			   (!(cable_tech & IXGBE_SFF_DA_ACTIVE_CABLE))) {
> +			status = hw->phy.ops.read_i2c_eeprom(hw,
> +					    IXGBE_SFF_SM_LENGTH,
> +					    &sm_length);

It seems like byte 15, Length (SMF), "Link length supported for single
mode fiber, units of 100 m" should be checked here. A 255 * 100m would
be more than 1Km, the condition you say in the comment.

	Andrew