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b=MhlxwvUjR7jL8BstuwYqE5yCDpDwu6mH+GB6BtHaR+uOYDgLdHU2gGsGhf8rlKet18Sej49wbbimFdPj4ztZLglGeRuPkuA8GH0FB4f1/uOLHCFCBus9i+2N0Dcp6QuFaJofQTI382GXKC2hsii8vkIX9JH4Om/5bNsdDHWEzDc= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from DS4PR12MB9708.namprd12.prod.outlook.com (2603:10b6:8:278::7) by SA1PR12MB7272.namprd12.prod.outlook.com (2603:10b6:806:2b6::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.202.18; Mon, 13 Jul 2026 23:18:26 +0000 Received: from DS4PR12MB9708.namprd12.prod.outlook.com ([fe80::8570:d817:2f81:c62a]) by DS4PR12MB9708.namprd12.prod.outlook.com ([fe80::8570:d817:2f81:c62a%6]) with mapi id 15.21.0202.014; Mon, 13 Jul 2026 23:18:26 +0000 Message-ID: <0d410deb-c670-4837-a87f-d4e8f3c73259@amd.com> Date: Mon, 13 Jul 2026 16:18:23 -0700 User-Agent: Mozilla Thunderbird Subject: Re: Ethtool is missing C2C link modes To: "D H, Siddaraju" , Maxime Chevallier , Andrew Lunn , Michal Kubecek , "netdev@vger.kernel.org" Cc: "Chintalapalle, Balaji" , "Das, Shubham" , "Srinivasan, Vijay" , "Samudrala, Sridhar" , "Keller, Jacob E" , "Nguyen, Anthony L" , "singhai.anjali55@gmail.com" , "Brandeburg, Jesse" References: From: Eric Joyner Content-Language: en-US In-Reply-To: Content-Type: text/plain; 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Just to > pick, the C2C is widely used when connecting Ethernet SoCs with retimers > and PCS SerDes terminated external-phys to offload PHY sublayer functions. > > With the existing ethtool link modes, we were not able to fit these C2C > interfaces on any others (we fitted **SGMII interfaces to baseT link modes) > and we see this as a gap. If you acknowledge this, we plan to send an > RFC patch to define below listed C2C link modes to ethtool. > > 10G_SFI_C2C SFF-8418 > 25G_AUI_C2C IEEE 802.3 Annex 109A > CAUI4 C2C IEEE 802.3 Annex 83D > LAUI2-C2C IEEE 802.3 Annex 135B > 50GAUI-1 C2C IEEE 802.3 Annex 135F > 200GAUI-4 C2C IEEE 802.3 Annex 120D > 100GAUI-1 C2C IEEE 802.3ck Annex 120F > 200GAUI-2 C2C IEEE 802.3ck Clause 162 > 400GAUI-4 C2C IEEE 802.3ck Clause 163 > > - Thank you, > Siddaraju D H > I'll piggyback on this thread because I have a related question about missing ethtool link modes: what about entries for various Active Cable types? e.g. AOC, ACC, and AEC for the appropriate speeds. I see some drivers (like i40e and ice) detect these and map them to SR or DA/CR types, but I don't see them do it in a consistent pattern, either. I couldn't find anything that suggested a precedent on how to handle these. - Eric