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 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 5E688C64E7A for ; Wed, 2 Dec 2020 01:18:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0150B2065E for ; Wed, 2 Dec 2020 01:18:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727661AbgLBBSv (ORCPT ); Tue, 1 Dec 2020 20:18:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33852 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727154AbgLBBSu (ORCPT ); Tue, 1 Dec 2020 20:18:50 -0500 Received: from mail-oi1-x244.google.com (mail-oi1-x244.google.com [IPv6:2607:f8b0:4864:20::244]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A1F6EC0613D4 for ; Tue, 1 Dec 2020 17:18:10 -0800 (PST) Received: by mail-oi1-x244.google.com with SMTP id t143so3968412oif.10 for ; Tue, 01 Dec 2020 17:18:10 -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=qRDj8Ztuw4ieEyC/TfWVhD6IWZpAYgGcob0SCtSO7nk=; b=TniAoSUWQRI7RkjTMBl42ygExPb34EeJQr4z3NLjhK3H+FSiJpp5sGOkQ7xU0t2iTh jIqijF4SmDlCBr9y8qG+cISsh1ESJeBi+e/jtpt3iV7rWA1D7YaasYpls8XTizr3dgTZ OMB6P1QLrYYvHX/xB/cnZudL2rZW35klpnClY= 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=qRDj8Ztuw4ieEyC/TfWVhD6IWZpAYgGcob0SCtSO7nk=; b=IncalAAfXp64uuHknm/Ysq+Ahe1sXv5n+CRsLZ40J5Ef322hURMlXfgNnscc2VN/qa ecPBXXwuerLzecyqLQ1OGW5fC0yDTp+wjggZZ27YKwF39/GGrSciQdXRCs5bGMOiJazG zf7zaj3lPzQ5OaEdxOtrCIZr1V/A8B6KG7RQu5xqbB7LFSx5n0odxmViDQ2vixSF/TIV J48IpOZ58ZMHwzXeFqGiTXAybBXopCBz/DgeK5XVemBit7fudQCgc/3IS4Rk4hBxKzVd zr08Y+ROEyysbfohLiIMseWHDgi8PR45wqb+/Ux5GxGaOgteSSPKKHqjEOsdRjLdo1aP JFww== X-Gm-Message-State: AOAM533puPa91ZlCEOIyLfh6YVf8D/XYFL484gMnrVDwjz5v9Uw6nBZS reKqNG6J6gvGx/EM63G9OYhSjwXAYNPEV1lQXeKYDA== X-Google-Smtp-Source: ABdhPJyeT2vW42dG3fwqW76pVa+59kEvgXX8XNi4Agzl+8ZnO0WEXqpBq+L5GR/3QjquWoT0Aau8k9FV3vuA/Gp5k48= X-Received: by 2002:aca:3e84:: with SMTP id l126mr97388oia.55.1606871889876; Tue, 01 Dec 2020 17:18:09 -0800 (PST) MIME-Version: 1.0 References: <20201019132446.tgtelkzmfjdonhfx@lion.mk-sys.cz> <20201021070820.oszrgnsqxddi2m43@lion.mk-sys.cz> <20201021084733.sb4rpzwyzxgczvrg@lion.mk-sys.cz> <20201022162740.nisrhdzc4keuosgw@lion.mk-sys.cz> <20201124221225.6ae444gcl7npoazh@lion.mk-sys.cz> <20201126210748.mzbe7ei3wjhvryym@lion.mk-sys.cz> In-Reply-To: From: Edwin Peer Date: Tue, 1 Dec 2020 17:17:33 -0800 Message-ID: Subject: Re: [PATCH net-next 1/6] ethtool: Extend link modes settings uAPI with lanes To: Danielle Ratson Cc: Michal Kubecek , Jiri Pirko , Andrew Lunn , Jakub Kicinski , Ido Schimmel , "netdev@vger.kernel.org" , "davem@davemloft.net" , Jiri Pirko , "f.fainelli@gmail.com" , mlxsw , Ido Schimmel , "johannes@sipsolutions.net" Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="00000000000036455205b57104bd" Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org --00000000000036455205b57104bd Content-Type: text/plain; charset="UTF-8" On Tue, Dec 1, 2020 at 9:23 AM Danielle Ratson wrote: > The suggestions I have are: > 1. Add a bit that for unknown media for each link (something like ETHTOOL_LINK_MODE_100000unknown_Full_BIT). I am not sure it is even possible or makes sense. > 2. Pass the link mode as bitmap. > > Do you see any other option? Other options include: 1) Let the user specify link encoding directly, as we do for FEC. This would imply the number of lanes used at a given speed rather than the other way around. Then you only need a handful of indices in the enum. 2) Instead of an enum, encode the semantics into the link mode bit representation. N bits define the speed. Other bits define the encoding, number of lanes, media, etc. This would solve the problem of decoding the intent from a single user selected link mode index, but would require a v2 UABI. The user could have the same strings, but not much more. And then, it's probably better to give each dimension their own field in a struct and be done, lest we run out of bits. Let the user space tool map the link mode string onto the appropriate struct values. Regards, Edwin Peer --00000000000036455205b57104bd Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQPAYJKoZIhvcNAQcCoIIQLTCCECkCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg2RMIIE6DCCA9CgAwIBAgIOSBtqCRO9gCTKXSLwFPMwDQYJKoZIhvcNAQELBQAwTDEgMB4GA1UE CxMXR2xvYmFsU2lnbiBSb290IENBIC0gUjMxEzARBgNVBAoTCkdsb2JhbFNpZ24xEzARBgNVBAMT Ckdsb2JhbFNpZ24wHhcNMTYwNjE1MDAwMDAwWhcNMjQwNjE1MDAwMDAwWjBdMQswCQYDVQQGEwJC RTEZMBcGA1UEChMQR2xvYmFsU2lnbiBudi1zYTEzMDEGA1UEAxMqR2xvYmFsU2lnbiBQZXJzb25h bFNpZ24gMiBDQSAtIFNIQTI1NiAtIEczMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA tpZok2X9LAHsYqMNVL+Ly6RDkaKar7GD8rVtb9nw6tzPFnvXGeOEA4X5xh9wjx9sScVpGR5wkTg1 fgJIXTlrGESmaqXIdPRd9YQ+Yx9xRIIIPu3Jp/bpbiZBKYDJSbr/2Xago7sb9nnfSyjTSnucUcIP ZVChn6hKneVGBI2DT9yyyD3PmCEJmEzA8Y96qT83JmVH2GaPSSbCw0C+Zj1s/zqtKUbwE5zh8uuZ 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