linux-kernel - Re: [PATCH] sfc: Export fibre-specific link modes for 1/10G

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Date:   Tue, 19 Oct 2021 17:31:52 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Erik Ekman <erik@...o.se>
Cc:     Edward Cree <ecree.xilinx@...il.com>,
        Martin Habets <habetsm.xilinx@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sfc: Export fibre-specific link modes for 1/10G

On Mon, Oct 18, 2021 at 08:37:08PM +0200, Erik Ekman wrote:
> These modes were added to ethtool.h in 5711a98221443 ("net: ethtool: add support
> for 1000BaseX and missing 10G link modes") back in 2016.
> 
> Only setting CR mode for 10G, similar to how 25/40/50/100G modes are set up.
> 
> Tested using SFN5122F-R7 (with 2 SFP+ ports) and a 1000BASE-BX10 SFP module.

Did you test with a Copper SFP modules? 

> +++ b/drivers/net/ethernet/sfc/mcdi_port_common.c
> @@ -133,9 +133,9 @@ void mcdi_to_ethtool_linkset(u32 media, u32 cap, unsigned long *linkset)
>  	case MC_CMD_MEDIA_QSFP_PLUS:
>  		SET_BIT(FIBRE);
>  		if (cap & (1 << MC_CMD_PHY_CAP_1000FDX_LBN))
> -			SET_BIT(1000baseT_Full);
> +			SET_BIT(1000baseX_Full);

I'm wondering if you should have both? The MAC is doing 1000BaseX. But
it could then be connected to a copper PHY which then does
1000baseT_Full? At 1G, it is however more likely to be using SGMII,
not 1000BaseX.

    Andrew