[PATCH] net: sfp: add quirk for OEM 2.5G optical modules

[PATCH] net: sfp: add quirk for OEM 2.5G optical modules

[weixiansen574]

Some OEM-branded SFP modules are incorrectly detected as
1000Base-X and fail to establish link on 2.5G-capable ports.

These modules do not properly advertise 2500Base-X capability
in their EEPROM and require forcing the correct SerDes mode.

Add sfp_quirk_2500basex for:

  - OEM SFP-2.5G-LH20-A
  - OEM SFP-2.5G-LH03-B

Both modules report:

  Vendor name: OEM
  Vendor PN: SFP-2.5G-LH20-A / SFP-2.5G-LH03-B

Tested on OpenWrt with successful 2.5G link establishment.

Signed-off-by: weixiansen574 <weixiansen574@163.com>
---
 drivers/net/phy/sfp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index bd970f753..6f3213793 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -583,6 +583,8 @@ static const struct sfp_quirk sfp_quirks[] = {
 	SFP_QUIRK_S("OEM", "SFP-2.5G-T", sfp_quirk_oem_2_5g),
 	SFP_QUIRK_S("OEM", "SFP-2.5G-BX10-D", sfp_quirk_2500basex),
 	SFP_QUIRK_S("OEM", "SFP-2.5G-BX10-U", sfp_quirk_2500basex),
+	SFP_QUIRK_S("OEM", "SFP-2.5G-LH20-A", sfp_quirk_2500basex),
+	SFP_QUIRK_S("OEM", "SFP-2.5G-LH03-B", sfp_quirk_2500basex),
 	SFP_QUIRK_F("OEM", "RTSFP-10", sfp_fixup_rollball_cc),
 	SFP_QUIRK_F("OEM", "RTSFP-10G", sfp_fixup_rollball_cc),
 	SFP_QUIRK_F("Turris", "RTSFP-2.5G", sfp_fixup_rollball),
-- 
2.54.0.windows.1

Re: [PATCH] net: sfp: add quirk for OEM 2.5G optical modules

[Jakub Kicinski]

On Wed, 20 May 2026 23:16:29 +0800 weixiansen574 wrote:
> Signed-off-by: weixiansen574 <weixiansen574@163.com>

A more official looking name is required.
Unicode characters are accepted FWIW, doesn't have to be westernized.

> diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
> index bd970f753..6f3213793 100644
> --- a/drivers/net/phy/sfp.c
> +++ b/drivers/net/phy/sfp.c
> @@ -583,6 +583,8 @@ static const struct sfp_quirk sfp_quirks[] = {
>  	SFP_QUIRK_S("OEM", "SFP-2.5G-T", sfp_quirk_oem_2_5g),
>  	SFP_QUIRK_S("OEM", "SFP-2.5G-BX10-D", sfp_quirk_2500basex),
>  	SFP_QUIRK_S("OEM", "SFP-2.5G-BX10-U", sfp_quirk_2500basex),
> +	SFP_QUIRK_S("OEM", "SFP-2.5G-LH20-A", sfp_quirk_2500basex),
> +	SFP_QUIRK_S("OEM", "SFP-2.5G-LH03-B", sfp_quirk_2500basex),

This list looks sorted, and I'd think LH03-B is before LH20-A 
because of the number?
-- 
pw-bot: cr