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SAI port serdes attributes support for Linear Pluggable Optics (LPO)

Signed-off-by: pullarao <[email protected]>
@tjchadaga
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/azp run

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@tjchadaga tjchadaga requested a review from prgeor June 26, 2025 15:05
@tjchadaga tjchadaga added the reviewed PR is discussed in SAI Meeting label Jun 26, 2025
* @default empty
*/
SAI_PORT_SERDES_ATTR_REACH_MODE,

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please check if this attribute is a standard one, defined in the spec and can be beneficial for all vendors. If it is vendor-specific please consider using the SAI "custom" infrastructure (#2122)

* @flags CREATE_AND_SET
* @default empty
*/
SAI_PORT_SERDES_ATTR_RX_ECD_MLSE_STATE,

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Please also double-check if it is a standard attribute. See my comment above

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@prgeor prgeor Jul 4, 2025

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@eddyk-nvidia MLSE is a known technique similar to existing channel equalization techniques like DFE, FFE, CTLE. Though here its being introduced in the LPO context, its not a mandatory attribute as per the LPO MSA. Its upto the user if they want to derive the extra BER improved performance that comes with MLSE being enabled(at the cost of extra power). For example, NLC attribute introduced here is also optional and not mandatory but helps to remove the non linearity based on your application specific channel characteristics.

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@eddyk-nvidia All these attributes are optional. Could you please provide your feedback.

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@eddyk-nvidia, @prgeor - could you please complete the review on this?

* @flags CREATE_AND_SET
* @default empty
*/
SAI_PORT_SERDES_ATTR_REACH_MODE,
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@prgeor prgeor Aug 25, 2025

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@pullaraogunda can we move this to custom attribute since this is not applicable for all vendors ?

    SAI_PORT_SERDES_ATTR_END,

    /** Custom range base value */
    SAI_PORT_SERDES_ATTR_CUSTOM_RANGE_START = 0x10000000,

    /** End of custom range base */
    SAI_PORT_SERDES_ATTR_CUSTOM_RANGE_END

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6 participants