[{"id":3686753,"web_url":"http://patchwork.ozlabs.org/comment/3686753/","msgid":"<6F0C5872-0388-47AF-8CD9-1D116EA13224@nutanix.com>","list_archive_url":null,"date":"2026-05-05T00:59:40","subject":"Re: [Intel-wired-lan] [PATCH net-next] e1000e: ethtool: add\n get_channels support","submitter":{"id":84134,"url":"http://patchwork.ozlabs.org/api/people/84134/","name":"Jon Kohler","email":"jon@nutanix.com"},"content":"> On May 4, 2026, at 7:49 PM, Jakub Kicinski wrote:\n> \n> On Mon, 4 May 2026 08:48:23 -0700 Jon Kohler wrote:\n>> e1000e hardware supports a single RX/TX queue pair, add basic support\n>> for ethtool -l (i.e. get_channels), so that callers indeed see a single\n>> queue.\n> \n> Why? Isn't EOPNOTSUP from ethtool -l implicitly saying that there's\n> only one queue?\n\nPerhaps, but I’m not sure that is a guarantee. A good relevant example\nis when I added get_channels support to enic, which supports all sorts\nof channels, so I don’t think EOPNOTSUP can be 100% consider reliable\nin that case. Meaning, if it just so happens that the original author(s)\ndidn't put in get_channels, that doesn’t necessarily mean there is only\none queue.\n\nAnd in this case, there is an \"other\" queue as as well too, as far as\nI can tell, so the output is at least semi-interesting.\n\nJon","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=osuosl.org header.i=@osuosl.org header.a=rsa-sha256\n header.s=default header.b=1+Tsa+JU;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=140.211.166.137; helo=smtp4.osuosl.org;\n envelope-from=intel-wired-lan-bounces@osuosl.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g9D59702Jz1yJx\n\tfor ; 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mx.microsoft.com 1; spf=pass\n smtp.mailfrom=nutanix.com; dmarc=pass action=none header.from=nutanix.com;\n dkim=pass header.d=nutanix.com; arc=none","From":"Jon Kohler ","To":"Jakub Kicinski ","CC":"Tony Nguyen , Przemek Kitszel\n , Andrew Lunn , \"David\n S. Miller\" , Eric Dumazet , Paolo\n Abeni , \"intel-wired-lan@lists.osuosl.org\"\n , \"netdev@vger.kernel.org\"\n , \"linux-kernel@vger.kernel.org\"\n ","Thread-Topic":"[PATCH net-next] e1000e: ethtool: add get_channels support","Thread-Index":"AQHc29Y9rxTi743U1ky+dQQiRDIOo7X+iX2AgAATsQA=","Date":"Tue, 5 May 2026 00:59:40 +0000","Message-ID":"<6F0C5872-0388-47AF-8CD9-1D116EA13224@nutanix.com>","References":"<20260504154823.2535612-1-jon@nutanix.com>\n <20260504164901.7b3a737b@kernel.org>","In-Reply-To":"<20260504164901.7b3a737b@kernel.org>","Accept-Language":"en-US","Content-Language":"en-US","X-MS-Has-Attach":"","X-MS-TNEF-Correlator":"","x-mailer":"Apple Mail (2.3864.500.181)","x-ms-publictraffictype":"Email","x-ms-traffictypediagnostic":"LV0PR02MB11133:EE_|DS0PR02MB10272:EE_","x-ms-office365-filtering-correlation-id":"4c8b0600-a1be-4b52-2c24-08deaa419646","x-proofpoint-crosstenant":"true","x-ms-exchange-senderadcheck":"1","x-ms-exchange-antispam-relay":"0","x-microsoft-antispam":"BCL:0;\n ARA:13230040|366016|1800799024|10070799003|7416014|376014|22082099003|56012099003|18002099003|38070700021;","x-microsoft-antispam-message-info":"\n 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","x-forefront-antispam-report":"CIP:255.255.255.255; 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Isn't EOPNOTSUP from ethtool -l implicitly saying that there's\n>>> only one queue? \n>> \n>> Perhaps, but I’m not sure that is a guarantee. A good relevant example\n>> is when I added get_channels support to enic, which supports all sorts\n>> of channels, so I don’t think EOPNOTSUP can be 100% consider reliable\n>> in that case. Meaning, if it just so happens that the original author(s)\n>> didn't put in get_channels, that doesn’t necessarily mean there is only\n>> one queue.\n>> \n>> And in this case, there is an \"other\" queue as as well too, as far as\n>> I can tell, so the output is at least semi-interesting.\n> \n> Sorry I wasn't clear enough - if you have an actual, real life use case\n> why you need queue count of 1 to be explicitly reported - please explain\n> it and put it in the commit message.\n> \n> If you don't - please don't send patches for the sake of it.\n\nAh, ok, sorry I misread your message, this isn’t a patch for the sake of\na patch. Long story short, we’ve got a user space part of our control plane\nthat reads in the output of ethtool -l as part of some broader queue\nmanagement code. On systems with an e1000e device present, this specific\ncomponent goes into a crash loop as it expects all NIC(s) to at least\ngive it some sort of output.\n\nThat crash loop is easy enough to fix to ignore unsupported outputs;\nhowever, my thought here is a simply defense in depth fixup, especially\nsince the kernel patch is quite trivial.","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=osuosl.org header.i=@osuosl.org header.a=rsa-sha256\n header.s=default header.b=uk+qw8L9;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=2605:bc80:3010::137; helo=smtp4.osuosl.org;\n envelope-from=intel-wired-lan-bounces@osuosl.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from smtp4.osuosl.org (smtp4.osuosl.org [IPv6:2605:bc80:3010::137])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g9D5F00RZz1yJx\n\tfor ; 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Miller\" , Eric Dumazet , Paolo\n Abeni , \"intel-wired-lan@lists.osuosl.org\"\n , \"netdev@vger.kernel.org\"\n , \"linux-kernel@vger.kernel.org\"\n ","Thread-Topic":"[PATCH net-next] e1000e: ethtool: add get_channels support","Thread-Index":"AQHc29Y9rxTi743U1ky+dQQiRDIOo7X+iX2AgAATsQCAAAIUAIAAAYGA","Date":"Tue, 5 May 2026 01:12:29 +0000","Message-ID":"","References":"<20260504154823.2535612-1-jon@nutanix.com>\n <20260504164901.7b3a737b@kernel.org>\n <6F0C5872-0388-47AF-8CD9-1D116EA13224@nutanix.com>\n <20260504180656.62539d96@kernel.org>","In-Reply-To":"<20260504180656.62539d96@kernel.org>","Accept-Language":"en-US","Content-Language":"en-US","X-MS-Has-Attach":"","X-MS-TNEF-Correlator":"","x-mailer":"Apple Mail (2.3864.500.181)","x-ms-publictraffictype":"Email","x-ms-traffictypediagnostic":"LV0PR02MB11133:EE_|PH0PR02MB7672:EE_","x-ms-office365-filtering-correlation-id":"1477445c-8143-4605-4d36-08deaa4360e9","x-proofpoint-crosstenant":"true","x-ms-exchange-senderadcheck":"1","x-ms-exchange-antispam-relay":"0","x-microsoft-antispam":"BCL:0;\n ARA:13230040|366016|10070799003|1800799024|7416014|376014|38070700021|56012099003|18002099003|22082099003;","x-microsoft-antispam-message-info":"\n 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","x-forefront-antispam-report":"CIP:255.255.255.255; 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A good relevant example\n>>>> is when I added get_channels support to enic, which supports all sorts\n>>>> of channels, so I don’t think EOPNOTSUP can be 100% consider reliable\n>>>> in that case. Meaning, if it just so happens that the original author(s)\n>>>> didn't put in get_channels, that doesn’t necessarily mean there is only\n>>>> one queue.\n>>>>\n>>>> And in this case, there is an \"other\" queue as as well too, as far as\n>>>> I can tell, so the output is at least semi-interesting. \n>>>\n>>> Sorry I wasn't clear enough - if you have an actual, real life use case\n>>> why you need queue count of 1 to be explicitly reported - please explain\n>>> it and put it in the commit message.\n>>>\n>>> If you don't - please don't send patches for the sake of it. \n>>\n>> Ah, ok, sorry I misread your message, this isn’t a patch for the sake of\n>> a patch. Long story short, we’ve got a user space part of our control plane\n>> that reads in the output of ethtool -l as part of some broader queue\n>> management code. On systems with an e1000e device present, this specific\n>> component goes into a crash loop as it expects all NIC(s) to at least\n>> give it some sort of output.\n>>\n>> That crash loop is easy enough to fix to ignore unsupported outputs;\n>> however, my thought here is a simply defense in depth fixup, especially\n>> since the kernel patch is quite trivial.\n> \n> Got it, thanks for explaining.\n> \n> My concern is that if we are expected to always report channel counts\n> we're signing up for a major whack-a-mole with the existing drivers.\n> Most drivers don't implement it. The networking stack does report\n> the number of queues the device asked for via rtnetlink:\n> \n> ip -j -d li show dev $ifc | jq '.[].num_rx_queues'\n> \n> but in your case I'd personally lean towards user space fix.\n\nYea, unless we wanted to modify the core ethtool logic so that a driver\nwithout .get_channels would report a single queue.. but I don't know if\nthat's very accurate.\n\nStill, I think in this case it makes sense to just fix the userspace to\nhandle EOPNOTSUPP instead of assuming it will be available.\n\nThanks,\nJake","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","intel-wired-lan@lists.osuosl.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=osuosl.org header.i=@osuosl.org header.a=rsa-sha256\n header.s=default header.b=hy58l40B;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=2605:bc80:3010::137; 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Miller\" , Eric Dumazet , \"Paolo\n Abeni\" , \"intel-wired-lan@lists.osuosl.org\"\n , \"netdev@vger.kernel.org\"\n , \"linux-kernel@vger.kernel.org\"\n ","References":"<20260504154823.2535612-1-jon@nutanix.com>\n <20260504164901.7b3a737b@kernel.org>\n <6F0C5872-0388-47AF-8CD9-1D116EA13224@nutanix.com>\n <20260504180656.62539d96@kernel.org>\n \n <20260504182635.39e1b7a6@kernel.org>","Content-Language":"en-US","From":"Jacob Keller ","In-Reply-To":"<20260504182635.39e1b7a6@kernel.org>","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"8bit","X-ClientProxiedBy":"MW4PR03CA0072.namprd03.prod.outlook.com\n (2603:10b6:303:b6::17) To SN7PR11MB7592.namprd11.prod.outlook.com\n (2603:10b6:806:343::16)","MIME-Version":"1.0","X-MS-PublicTrafficType":"Email","X-MS-TrafficTypeDiagnostic":"SN7PR11MB7592:EE_|SJ5PPFF8B526086:EE_","X-MS-Office365-Filtering-Correlation-Id":"9a136244-6dcf-4cb3-97ee-08deac933cd8","X-LD-Processed":"46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr","X-MS-Exchange-SenderADCheck":"1","X-MS-Exchange-AntiSpam-Relay":"0","X-Microsoft-Antispam":"BCL:0;\n ARA:13230040|1800799024|366016|376014|3023799003|56012099003|18002099003|22082099003;","X-Microsoft-Antispam-Message-Info":"\n JsgyfOAY1tEndeL+aLkTcwyVV0w54vtinl3UE1cxfYHZtZQUNH2+mVxlty5D8KhFhHoEEtJ7GgpoG/YuIsP6FC6IW7ueERsUrP5U1kJbC/RXPHgSEU7kE2+BBTdp+1VneuBGNVpjKW2UtUfv9mX5kqjqRZT8LNTNM26wKjY+gllbZl7Y8IitwKte+2c8vLa00ICQY7jMywqGgJXqzhkAu20xtH/EqsreWqnQZNzUxsmU//OKH4xpCosvtjIIDgUD0numi/L8Zcoihdn0usIoySeBRsJlVKQHtTs+HGaMjF9OSsqIqW/2bb2ymbFsDEdO6yYfXI1x7Q3NNLlSw5GTUqAel9wyoUmhHlKaoYrdLSS8OgkhWBu6HCkGGahd1v9Tm/1nhAR6AWMSBAjridGGgFPuKwMnluFUlZO4drnrn833JIM3H5TGs63Q8aq7D/cf5GfZfTyoplDq1RvXcs5OTGHpxPWAaOhwtcMjx5pC883KeAUfIt+xAeNzKDVMwVyMEqpGCCFiEq5QjiWisSutKJmqlNShW/W5PWEn8Ml+pPt9sBjv9nGwdz4hUxW8j9kZeTTT04qHQyqKt+rWLbwZjsfoGnVCJk5hA47essAYyjAZHIwfdagSMRm+XK5WXDZIbR5IOYuMmnbY9EEUI6fgNrONfOpHp/t3W6uYEcTjvzSqii1CZ63sEoEdneM3jwgc","X-Forefront-Antispam-Report":"CIP:255.255.255.255; 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