From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from fhigh3-smtp.messagingengine.com (fhigh3-smtp.messagingengine.com [103.168.172.154]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8DBB71CA98; Thu, 21 Mar 2024 12:33:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=103.168.172.154 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711024413; cv=none; b=r6U2OIdaYAW/hF5ReWGqSRuzU/r85ukOyA0aRKFlHLq4aNjt96JE35gC8tUGNZwNgT7w6zczE17t1s4+V7n2WMYDVO98RZXzm7IRisJ7xuHcXwb8IFzTB99MwKTjRpbHkBYQJUsWllgHTx/R3qOby8pvYmYpJyyKfqWCyd8rYTQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711024413; c=relaxed/simple; bh=q5IfiyaueGM8Q4RRN24o4rSaqoE85hMKqBJB+BrvQeU=; h=Content-Type:Mime-Version:Subject:From:In-Reply-To:Date:Cc: Message-Id:References:To; b=EzgDfEfpsaUhxxrWzjS1aiBxK0HgOdbeY2VfvmRKKFASplEaQAEzJ4T4s/iIfnENbh5vtZGW7AZYAgXANQooaVCESMIx0dgBGvCKX/AITabVJXV8u5nRfYd2d6hAM3+M7ZSFRDkot6xa5EJ04s9XjcNfDhGo7Pr9YrPUzh6Vv9Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=yotsuba.nl; spf=pass smtp.mailfrom=yotsuba.nl; dkim=pass (2048-bit key) header.d=yotsuba.nl header.i=@yotsuba.nl header.b=DFaTq9Qp; dkim=pass (2048-bit key) header.d=messagingengine.com header.i=@messagingengine.com header.b=XiGJ5Jj/; arc=none smtp.client-ip=103.168.172.154 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=yotsuba.nl Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=yotsuba.nl Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=yotsuba.nl header.i=@yotsuba.nl header.b="DFaTq9Qp"; dkim=pass (2048-bit key) header.d=messagingengine.com header.i=@messagingengine.com header.b="XiGJ5Jj/" Received: from compute6.internal (compute6.nyi.internal [10.202.2.47]) by mailfhigh.nyi.internal (Postfix) with ESMTP id 9531A11400F6; Thu, 21 Mar 2024 08:33:30 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute6.internal (MEProxy); Thu, 21 Mar 2024 08:33:30 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yotsuba.nl; h=cc :cc:content-transfer-encoding:content-type:content-type:date :date:from:from:in-reply-to:in-reply-to:message-id:mime-version :references:reply-to:subject:subject:to:to; s=fm1; t=1711024410; x=1711110810; bh=fG/X16PKF1cEznvYesAB8B6aZcrt7Z18W0ByBUINONs=; b= DFaTq9QpmSbuVItJ7aQTwmdbofl+SJ1NulYtgG05HfQv74eHa7ixjW1dEnyR4YF6 gMNggU9swb1zNxcA7Q2X3MRD4qyQDHWhzGLUeOAa1oN/1JrBD9d8h2V7NSbAaZfw Ruyt7pm7JmnsBbhmfXECibrP3AwOOuqixzE/HGI3Re08ZsagmDymoLQwbjxfK+Nz X3DLtFX1enVGHdABUlvEbstzl0QenLdZ0YB1gD1VNXDS1H89iRGthO7FHlrsYH8N 8mnqgzsLMcXatfXeD45hzbhQjjJt8/SO4r6gXcB4JkbZc6GWlNXpBfJCdm6Zs/zH YnKnvXY3Q932j3kL1QLg8w== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding :content-type:content-type:date:date:feedback-id:feedback-id :from:from:in-reply-to:in-reply-to:message-id:mime-version :references:reply-to:subject:subject:to:to:x-me-proxy:x-me-proxy :x-me-sender:x-me-sender:x-sasl-enc; s=fm2; t=1711024410; x= 1711110810; bh=fG/X16PKF1cEznvYesAB8B6aZcrt7Z18W0ByBUINONs=; b=X iGJ5Jj/+7vFQJEWGtOHUdBu8KVQQZepnxO/5K2w4G/5Vtz3NTfzTRi406aZuXgSU 6gRLdFbOI6GQAQ4+Dyp/2o8Eg4BJjGODXjgS/Htf6dw5GHygiEEIOBTaix5ZQA5Y AZlFLtkU42gAsdDUDyRB9G+NhAM41zWvtMOWnSBWwebmGnXchw+Qevj7p8joBVTm Pp7IPDFQyMM9QkiqPK+vMI3P/xFgSgZITdEjepaORHm4jPUwbJC4oyVRfRj6DsK+ tiM/mVhYcpQB9o0809CYqgcW7zgy+w/MlVHdK+04jOzlkOhQV8Ly0Aql/P8RvJNp upo2oENv4T1TUxIQxBNug== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvledrleeigdegudcutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenuc fjughrpegtggfuhfgjffevgffkfhfvofesthhqmhdthhdtjeenucfhrhhomhepofgrrhhk uceomhgrrhhkseihohhtshhusggrrdhnlheqnecuggftrfgrthhtvghrnhepfefgfeevie efueelffekffevhfeufeduuddugeekuefhiedvieelfeelteduvdeinecuffhomhgrihhn pehkvghrnhgvlhdrohhrghenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmh grihhlfhhrohhmpehmrghrkheshihothhsuhgsrgdrnhhl X-ME-Proxy: Feedback-ID: i85e1472c:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Thu, 21 Mar 2024 08:33:29 -0400 (EDT) Content-Type: text/plain; charset=utf-8 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3774.300.61.1.2\)) Subject: Re: [EXTERNAL] [PATCH] netpoll: support sending over raw IP interfaces From: Mark In-Reply-To: Date: Thu, 21 Mar 2024 13:33:17 +0100 Cc: "netdev@vger.kernel.org" , Hans de Goede , Eric Dumazet , Jakub Kicinski , Breno Leitao , Ingo Molnar , "David S. Miller" , Paolo Abeni , "linux-kernel@vger.kernel.org" Content-Transfer-Encoding: quoted-printable Message-Id: <4ACBB9C7-EFF5-47CA-9A8A-114209AE7953@yotsuba.nl> References: <20240313124613.51399-1-mark@yotsuba.nl> <20240313133602.GA1263314@maili.marvell.com> <7C42FC4B-D803-4194-8FBB-19A432D37124@yotsuba.nl> <57AE2A31-257C-4702-A571-C590A5DD234A@yotsuba.nl> To: Ratheesh Kannoth X-Mailer: Apple Mail (2.3774.300.61.1.2) Hi Ratheesh, > Op 18 mrt 6 Reiwa, om 15:06 heeft Ratheesh Kannoth = het volgende geschreven: >=20 >> [=E2=80=A6] > Is below network topology possible ? =20 > Netpoll()- ------> netdev A ----> raw interface=20 > Where netdev A's netdev->header_ops !=3D NULL I believe so, this is not uncommon in tunnel devices like gretap. However, those fully encapsulate the link layer header in the packet to the lower interface. I am not aware of a interface driver that = removes a header upon xmit, so to speak. However, I have just posted a v2 that instead uses the documented `dev_has_header()` API, which seems to fit = the check exactly, here: https://lore.kernel.org/netdev/20240321122003.20089-1-mark@yotsuba.nl/T/ I hope this change manages to mitigate your concerns. :-) > [=E2=80=A6] Thanks and regards, Mark