From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 68EEBE556; Fri, 16 Feb 2024 01:10:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708045815; cv=none; b=MjRenzhx/MMgXf+bhDvcsiuTwMhWgbJlccjSGnn8dVX1zVuFkWX9n3+CBNYbzzeZeBpWV8tmKyYwRWmOhwK/gM7eKW/o4yKK1sKIxGQNZci8LWtxMADyFB+7BAxhGZZm6q0nl3X0NCXCxTC+RFUL/ZczrcL6cYgYA0QOJrBeRcM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708045815; c=relaxed/simple; bh=xLBubupRGpWWe5G03FJEqiwiLIlYHoIS//7jBeX8o28=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=d2m0l4U4tKuEr04OjtXlpLkLgd+fLm5AErkDVRde6SVOVTmAlle3MtVNEZJtWd8EVztCMX+mJZDvV414zdXKfzbAY/gyjGx/lxEadc+2VrztonRHEJ+n1bmMHrX76q5mh/bFIJiIBNqjOh3bz20eqPBBnxx3qq8CvNlaeC6olRA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=bFWM4tjP; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="bFWM4tjP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2D78CC433F1; Fri, 16 Feb 2024 01:10:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1708045814; bh=xLBubupRGpWWe5G03FJEqiwiLIlYHoIS//7jBeX8o28=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=bFWM4tjPaFcoTo7RAF6R5EbV6kRW4qVOZ/HyEWShES9Gb2Rj7u181bu3uAsHfco27 rDiMMCFTKDQjaZTeyWPFKjHllt5/lkJ69lcXj5svrZHVJagRBcusDaGNj0qjKvVOlB 9cmm2OHf4tJTkOzvW72UPKlOgZ2VHKpmFUdX6LzccRLHFeg9NxbQUvDe0X/TWZRMuo nveb9/x1LjDXpUui8GxUklgkvLXFYzr1zdKeDoAnwlDJiLgLsfLsQBOSVQb5xQ02SK tDLW5coDBNvFogwqayaDocErHPC0Io9MHB7uoQuJCgScmv/bKnvpU2oNxeSRi2ny1m gOevMz5CJOwFw== Date: Thu, 15 Feb 2024 17:10:13 -0800 From: Jakub Kicinski To: Jason Gunthorpe Cc: Christoph Hellwig , Saeed Mahameed , Arnd Bergmann , Greg Kroah-Hartman , Leon Romanovsky , Jiri Pirko , Leonid Bloch , Itay Avraham , Saeed Mahameed , David Ahern , Aron Silverton , andrew.gospodarek@broadcom.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: Re: [PATCH V4 0/5] mlx5 ConnectX control misc driver Message-ID: <20240215171013.60566d7b@kernel.org> In-Reply-To: <20240215132138.GK1088888@nvidia.com> References: <20240207072435.14182-1-saeed@kernel.org> <20240214074832.713ca16a@kernel.org> <20240215132138.GK1088888@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Thu, 15 Feb 2024 09:21:38 -0400 Jason Gunthorpe wrote: > On Wed, Feb 14, 2024 at 07:48:32AM -0800, Jakub Kicinski wrote: > > On Wed, 14 Feb 2024 00:29:16 -0800 Christoph Hellwig wrote: > > > With my busy kernel contributor head on I have to voice my > > > dissatisfaction with the subsystem maintainer overreach that's causing > > > the troubles here. > > > > Overreach is unfortunate, I'd love to say "please do merge it as part > > of RDMA". You probably don't trust my opinion but Jason admitted himself > > this is primarily for RDMA. > > "admitted"? You make it sound like a crime. I've been very clear on > this need from the RDMA community since the first posting. Sorry, unintentional :) Maybe it's a misunderstanding but my impression was that at least Saeed was trying hard to make this driver a common one, not just for RDMA. > > The problem is that some RDMA stuff is built really closely on TCP, > > Huh? Since when? Are you talking about soft-iwarp? That is a reasearch > project and Bernard is very responsive, if you have issues ask him and > he will help. > > Otherwise the actual HW devices are not entangled with netdev TCP, the > few iWarp devices have their own TCP implementation, in accordance > with what the IETF standardized. There are some things I know either from work or otherwise told me in confidence which I can't share. This is very frustrating for me, and probably for you, sorry :( > > and given Jason's and co. inability to understand that good fences > > make good neighbors it will soon start getting into the netdev stack :| > > I seem to recall you saying RDMA shouldn't call any netdev APIs at > all. We were unable to agree on where to build the fence for this > reason. Last time you were calling into the IPsec stack right? It's not just a basic API. IDK how to draw a line, definitely open to suggestions! > > Ah, and I presume they may also want it for their DOCA products. > > So 80% RDMA, 15% DOCA, 5% the rest is my guess. > > I don't know all details about DOCA, but what I know about runs over > RDMA. Well, since you're an RDMA person that's not really saying much about existence of other parts.