From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 60809C388F9 for ; Thu, 19 Nov 2020 20:39:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D93F12222F for ; Thu, 19 Nov 2020 20:39:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="g3Ie2cFd" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726100AbgKSUjM (ORCPT ); Thu, 19 Nov 2020 15:39:12 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36314 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725887AbgKSUjL (ORCPT ); Thu, 19 Nov 2020 15:39:11 -0500 Received: from mail-oi1-x242.google.com (mail-oi1-x242.google.com [IPv6:2607:f8b0:4864:20::242]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5B266C0613CF for ; Thu, 19 Nov 2020 12:39:11 -0800 (PST) Received: by mail-oi1-x242.google.com with SMTP id d9so7875041oib.3 for ; Thu, 19 Nov 2020 12:39:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=v824lG//nmLu7fMmCoQN9yLeXX898jVxJG1IxzxuRio=; b=g3Ie2cFdQ2BibjpI9v6ddxOoAxgRk7Z+O55lynwKl6JCJjylOxoy9CZwUzdymh4mu5 alADNDskJpLlDcXpeN42xZUM547vDZscKlmgniOEWJ+4pWxCOfwnDXebYSGKqUrMni7z R6zO1Ves6Co4jPcCJ5lQvoXGhlSWxzWs+dwko= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=v824lG//nmLu7fMmCoQN9yLeXX898jVxJG1IxzxuRio=; b=Apow/Am5mYhKnCc+L/hYL5Ojj7ZhDxjmzaePz/oUrFc9ix9ZqxpC/2RaQ5P6Zjf93N QdYA60+PVq+w6dyI4uZJ3uEO1wOG68RhUqrawCfRw6pJ77JaRC3aB5rLf9w5ubLUaLgR WXNfWEu+HtuRfYRhHmyyl/bdTOwqgOxN+W2xQWt259gxfDPD7CVR0Mps74OUu0LFdI4g Hdgg37qqbRFKgSnVmQCnq94nlgG4RMn58Jhj/cpfarGvQXEGF6TRAUBPjN6ls62Fqy4K S1pz4XpQhokBCwbrD9MR4bLKXpQRhlzM2k2Du+VjRzGsqtZS5ESQ+p9o2YjmFg0qOm1J qsIA== X-Gm-Message-State: AOAM532CQGPC3QEbOeTSfVBurHMo69EJxlYe363LbKMlWyTAQ+i+MJ60 dNL1mrAfE2UXn8Mrs33yidv3s5e9Oml61GHrvJTYbr66MEQ= X-Google-Smtp-Source: ABdhPJwAB1LtKrk2AjfPljnfsewvFfxKCp99hF74P17v8gQD01Vq6eGeDnzN1Fw7n/7PKb/RfRRo+l8B2PK3kMOwGK4= X-Received: by 2002:aca:da89:: with SMTP id r131mr4359470oig.166.1605818350610; Thu, 19 Nov 2020 12:39:10 -0800 (PST) MIME-Version: 1.0 References: <20201010154119.3537085-1-idosch@idosch.org> <20201010154119.3537085-2-idosch@idosch.org> In-Reply-To: <20201010154119.3537085-2-idosch@idosch.org> From: Edwin Peer Date: Thu, 19 Nov 2020 12:38:34 -0800 Message-ID: Subject: Re: [PATCH net-next 1/6] ethtool: Extend link modes settings uAPI with lanes To: Ido Schimmel Cc: netdev , "David S . Miller" , Jakub Kicinski , jiri@nvidia.com, danieller@nvidia.com, andrew@lunn.ch, f.fainelli@gmail.com, mkubecek@suse.cz, mlxsw@nvidia.com, Ido Schimmel Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000006256ee05b47bb827" Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org --0000000000006256ee05b47bb827 Content-Type: text/plain; charset="UTF-8" On Sat, Oct 10, 2020 at 3:54 PM Ido Schimmel wrote: > Add 'ETHTOOL_A_LINKMODES_LANES' attribute and expand 'struct > ethtool_link_settings' with lanes field in order to implement a new > lanes-selector that will enable the user to advertise a specific number > of lanes as well. Why can't this be implied by port break-out configuration? For higher speed signalling modes like PAM4, what's the difference between a port with unused lanes vs the same port split into multiple logical ports? In essence, the driver could then always choose the slowest signalling mode that utilizes all the available lanes. 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