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=-5.9 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 3ACA4C433E9 for ; Tue, 19 Jan 2021 08:27:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E125F23132 for ; Tue, 19 Jan 2021 08:27:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389443AbhASFYi (ORCPT ); Tue, 19 Jan 2021 00:24:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44712 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389780AbhASFHt (ORCPT ); Tue, 19 Jan 2021 00:07:49 -0500 Received: from mail-lf1-x133.google.com (mail-lf1-x133.google.com [IPv6:2a00:1450:4864:20::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 91FABC061573 for ; Mon, 18 Jan 2021 21:07:08 -0800 (PST) Received: by mail-lf1-x133.google.com with SMTP id m25so27256121lfc.11 for ; Mon, 18 Jan 2021 21:07:08 -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=W/akeY6XUNiqWfwdMt2/eXhxvh8/S5DansuQjUtRcoI=; b=U+LgW9fAGg/LtQ0/+ydluXEu11jXbM7W1beVgBWaw0C83L3c64RqsaVJsdjstwr124 EHGCp0RYNZSos5YCjXHQVeJOVdu3wKG3qU8BdUEGC5WhMEzV1JG2myYZKtlHEe/Ws6pK ajdCKANc00gGdxdMOzUVV2DcL0RoQrng/ckzI= 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=W/akeY6XUNiqWfwdMt2/eXhxvh8/S5DansuQjUtRcoI=; b=inUswo+RzNdsAbdTXdVnEF3McdW4xM4wudVMARodmkXlzl/frT5bQ1aHi4zhVxj32d /QtNOq+SoF3TMIk6qqiCeEMGF98krzf5jxmBFDn7P4HX9aU9OSwhwkc8VsABorx3pp5/ 2kYpaV4MJdqMot8dASSoWt1n990ft1vSEN2wmGgspGZWHNfs/5xN04Z3XsqpUUDHsC4J 14IGCfP+HGnYg4KiW5IQUSpYNUDf1WxxgaQahVqY38oiqAMF7kYR8rpW5z7AZu303q8N 3k4umlgLDtBKaDRd4fdW1cHwzsjMnDgu75dk1JZkwEN1UXlRpJ2S9erIjN/dL3+/9xbR sfng== X-Gm-Message-State: AOAM533Dzr+sazV7fzy8v6t1sKca9FH/jpNWolKNgPEV37sSm2xNtfrm fZvAOoRCj8nNhNaEvo9bYTmS8cWNNAp0gucdtjfxp2pmO5Q= X-Google-Smtp-Source: ABdhPJy0PiSjlvmTk6z+ZCuTP1NMN8R9dvMWptflalmNSpqMV2fw+LCH2X9vQLXaCNWgx+XyqoRG8x/9Isl8R1YlLT8= X-Received: by 2002:ac2:4e4e:: with SMTP id f14mr586518lfr.7.1611032826513; Mon, 18 Jan 2021 21:07:06 -0800 (PST) MIME-Version: 1.0 References: <20210113121222.733517-1-jiri@resnulli.us> <9b940a66-8c91-34c1-e64e-42b92bf403a8@gmail.com> <5ee0f841-2474-ef27-ac5d-7686d40bc18f@gmail.com> In-Reply-To: <5ee0f841-2474-ef27-ac5d-7686d40bc18f@gmail.com> From: Edwin Peer Date: Mon, 18 Jan 2021 21:06:30 -0800 Message-ID: Subject: Re: [patch net-next RFC 00/10] introduce line card support for modular switch To: David Ahern Cc: Jiri Pirko , netdev , "David S . Miller" , Jakub Kicinski , Jacob Keller , roopa@nvidia.com, mlxsw Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000005c7b2b05b939cfbe" Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org --0000000000005c7b2b05b939cfbe Content-Type: text/plain; charset="UTF-8" On Mon, Jan 18, 2021 at 6:39 PM David Ahern wrote: > > Indeed, this is what we ended up doing, although we still need to > > confirm Network Manager, systemd and whatever else our customers might > > use do the necessary to satisfy the user requirement to handle the > > delayed init. > > I am not surprised about the issue - boot times have been improved and > devices have gotten more complicated. And I was wondering how network > managers (add ifupdown{2} to that list) would handle an EAGAIN. You > could have an event sent -- e.g., IFLA_EVENT_FW_READY -- to allow > managers to avoid polling. Redundant for multiple netdev's per device, > but makes it event driven. This is what I was hinting at by talking about another device state. For that, there would necessarily need to be an event to inform user space about the transition out of said state into normal open/up. Of course, the tools would need to be updated to know about such a new event too. EAGAIN does seem simpler. In our case, we don't expect to be polling too long, or frequently for that matter. It is exceptionally rare that the firmware wouldn't be ready, but it can happen. Regards, Edwin Peer --0000000000005c7b2b05b939cfbe 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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