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=-7.2 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 C25DDC71155 for ; Mon, 30 Nov 2020 17:03:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 35B1E20789 for ; Mon, 30 Nov 2020 17:03:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="XWTOroDt" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729260AbgK3RDB (ORCPT ); Mon, 30 Nov 2020 12:03:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43322 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728837AbgK3RDB (ORCPT ); Mon, 30 Nov 2020 12:03:01 -0500 Received: from mail-oi1-x243.google.com (mail-oi1-x243.google.com [IPv6:2607:f8b0:4864:20::243]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 42A81C0613CF for ; Mon, 30 Nov 2020 09:02:21 -0800 (PST) Received: by mail-oi1-x243.google.com with SMTP id h3so14887215oie.8 for ; Mon, 30 Nov 2020 09:02:21 -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=nf0BLso//5WiV40JpafL9Us1vcv9q7MDHLlkjmqkrPE=; b=XWTOroDtq7UPBhM8LARD3OK3eZ3so8GALANzZnwTvNnIzFlxUBDFhZUqyWOzwRwam+ ATV2k4ZkQ3uw5qa+rIqkMijB4wQWhF49TwU8vd/OEhojN9WmguEuCarbgcLM4RdE84v9 SUYVyr65mJSdhswnkxvgRF34ANu3bj9bPuCMg= 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=nf0BLso//5WiV40JpafL9Us1vcv9q7MDHLlkjmqkrPE=; b=bp4Ca8F88NOaqTMCDT9wCNgHFh3jZEhBKSK7ElwZw3Ktmmx8iZyPUIpP8i7QS2JAQH PlJUfEJR3yPR7fQ081AZFTNxT/YKKkS58CVTXR0U2STGVlHo2X0LjTZjM7gC1dJ3TGwI HAfoYjRwzygj36YCzTyJgp/K2d824XzTQ9KVqui+pnImveRADOKFoHWSmsfQIwYMLjdH hrk+4t9u75PkDYiI9Z5G+V6eMRJ2OcnHxVcobWEWoucyXvgO/5FVecVC4WAdDBCC79uq CGXJtMgItdcQ3mldCdKetxgnStGQQ7s15+cm55MIywM052iDIA1+k4LV5iqHd3wnRJd8 DUGA== X-Gm-Message-State: AOAM533Ah5GEzZzx9eGtpeyY0Y98KMaqjRko8B9w4ykNWbaCG8iDtQzI BjDfmN5PHFHZfDwUhgv7PFtxawmnSdEB0s4kLDZc8A== X-Google-Smtp-Source: ABdhPJwDBlrofNrjmRfUiQDXiwqZOT0KbBEJqQThrermnP0QfrppEvsn53amjt8cOg9DyadqGz3wPWApWqp8jnj6+Ig= X-Received: by 2002:a05:6808:496:: with SMTP id z22mr14865204oid.2.1606755740451; Mon, 30 Nov 2020 09:02:20 -0800 (PST) MIME-Version: 1.0 References: <20201010154119.3537085-1-idosch@idosch.org> <20201010154119.3537085-2-idosch@idosch.org> <20201123094026.GF3055@nanopsycho.orion> In-Reply-To: <20201123094026.GF3055@nanopsycho.orion> From: Edwin Peer Date: Mon, 30 Nov 2020 09:01:43 -0800 Message-ID: Subject: Re: [PATCH net-next 1/6] ethtool: Extend link modes settings uAPI with lanes To: Jiri Pirko Cc: Ido Schimmel , 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="0000000000002d27a905b555f967" Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org --0000000000002d27a905b555f967 Content-Type: text/plain; charset="UTF-8" On Mon, Nov 23, 2020 at 1:40 AM Jiri Pirko wrote: > >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 > > There is a crucial difference. Split port is configured alwasy by user. > Each split port has a devlink instace, netdevice associated with it. > It is one level above the lanes. Right, but the one still implies the other. Splitting the port implies fewer lanes available. I understand the concern if the device cannot provide sufficient MAC resources to provide for the additional ports, but leaving a net device unused (with the option to utilize an additional, now spare, port) still seems better to me than leaving lanes unused and always wasted. Otherwise, the earlier suggestion of fully specifying the forced link mode (although I don't think Andrew articulated it quite that way) instead of a forced speed and separate lane mode makes most sense. 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