[PATCH] net/ixgbe: Treat 1G Cu SFPs as 1G SX on the X550 devices

[Thomas Monjalon]

Please, could we have a review of this patch?
+Cc new ixgbe maintainers


07/03/2022 23:34, jeffd at silicom-usa.com:
> From: Stephen Douthit <stephend at silicom-usa.com>
> 
> 1G Cu SFPs are not officially supported on the X552/X553 family of devices
> but treat them as 1G SX modules since they usually work.  Print a warning
> though since support isn't validated, similar to what already happens for
> other unofficially supported SFPs enabled via the allow_unsupported_sfps
> parameter inherited from the mainline Linux driver.
> 
> Signed-off-by: Stephen Douthit <stephend at silicom-usa.com>
> Signed-off-by: Jeff Daly <jeffd at silicom-usa.com>
> ---
>  drivers/net/ixgbe/base/ixgbe_x550.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ixgbe/base/ixgbe_x550.c b/drivers/net/ixgbe/base/ixgbe_x550.c
> index 8810d1658e..8d1bc6c80d 100644
> --- a/drivers/net/ixgbe/base/ixgbe_x550.c
> +++ b/drivers/net/ixgbe/base/ixgbe_x550.c
> @@ -1538,9 +1538,21 @@ STATIC s32 ixgbe_supported_sfp_modules_X550em(struct ixgbe_hw *hw, bool *linear)
>  	case ixgbe_sfp_type_1g_lha_core1:
>  		*linear = false;
>  		break;
> -	case ixgbe_sfp_type_unknown:
> +	/* Copper SFPs are not officially supported for x550em devices, but can
> +	 * often be made to work at fixed 1G speeds.  Pretend they're 1g_sx
> +	 * modules here to allow g.Fast DSL SFPs to work.
> +	 */
>  	case ixgbe_sfp_type_1g_cu_core0:
> +		EWARN(hw, "Pretending that unsupported 1g_cu SFP is 1g_sx\n");
> +		*linear = false;
> +		hw->phy.sfp_type = ixgbe_sfp_type_1g_sx_core0;
> +		break;
>  	case ixgbe_sfp_type_1g_cu_core1:
> +		EWARN(hw, "Pretending that unsupported 1g_cu SFP is 1g_sx\n");
> +		*linear = false;
> +		hw->phy.sfp_type = ixgbe_sfp_type_1g_sx_core1;
> +		break;
> +	case ixgbe_sfp_type_unknown:
>  	default:
>  		return IXGBE_ERR_SFP_NOT_SUPPORTED;
>  	}