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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 60904EB64DD for ; Tue, 11 Jul 2023 16:01:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232296AbjGKQBU (ORCPT ); Tue, 11 Jul 2023 12:01:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38152 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230486AbjGKQBC (ORCPT ); Tue, 11 Jul 2023 12:01:02 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BB2401BC6; Tue, 11 Jul 2023 09:00:51 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 4232761561; Tue, 11 Jul 2023 16:00:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B73A1C433C8; Tue, 11 Jul 2023 16:00:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1689091250; bh=qJNl12vo3sFEgIC9eU4i4GFHtknelm6lEufyoqloygg=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=H5Pjqt9ztd1rsXJxiMRPURZwTa2ExxdjvmdAB+R2m6SIGj9BZXzsFh8fGEuiSTvcm judzO3qp7mqlviGZdHfT9sbnjnh7490DvZQa7s5T+0mqaBlhZbmTkQYKjneddOr+zU I70OFnP7HqecLR1sMTBg5IyfCTdYnn+/rbEAn2glXwwMxHVhQ+QwarY7jc03Bi7ww2 byWkJRLIUtz0tkaUzKuPvGqtrAhdOE7ZFL4wWDtTcgcgau59/IWCMnMGAP6m8DA2sQ fnlNevf7wZVPt1tPCiqMTLRIvyGYwZut8EY+Mzks1hOkDrkQuZgqAklkfJWwGQfh+U q8F+qHZDvJx3w== Date: Tue, 11 Jul 2023 09:00:47 -0700 From: Jakub Kicinski To: Jason Gunthorpe , Christoph Hellwig Cc: Mina Almasry , John Hubbard , Dan Williams , David Ahern , Jesper Dangaard Brouer , brouer@redhat.com, Alexander Duyck , Yunsheng Lin , davem@davemloft.net, pabeni@redhat.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Lorenzo Bianconi , Yisen Zhuang , Salil Mehta , Eric Dumazet , Sunil Goutham , Geetha sowjanya , Subbaraya Sundeep , hariprasad , Saeed Mahameed , Leon Romanovsky , Felix Fietkau , Ryder Lee , Shayne Chen , Sean Wang , Kalle Valo , Matthias Brugger , AngeloGioacchino Del Regno , Jesper Dangaard Brouer , Ilias Apalodimas , linux-rdma@vger.kernel.org, linux-wireless@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, Jonathan Lemon Subject: Re: Memory providers multiplexing (Was: [PATCH net-next v4 4/5] page_pool: remove PP_FLAG_PAGE_FRAG flag) Message-ID: <20230711090047.37d7fe06@kernel.org> In-Reply-To: References: <5e0ac5bb-2cfa-3b58-9503-1e161f3c9bd5@kernel.org> <20230711042708.GA18658@lst.de> <20230710215906.49514550@kernel.org> <20230711050445.GA19323@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 11 Jul 2023 09:05:02 -0300 Jason Gunthorpe wrote: > On Tue, Jul 11, 2023 at 07:04:45AM +0200, Christoph Hellwig wrote: > > On Mon, Jul 10, 2023 at 09:59:06PM -0700, Jakub Kicinski wrote: > > > Noob question - how does RDMA integrate with the out of tree junk? > > > AFAIU it's possible to run the "in-tree" RDMA stack and get "GPU > > > direct". > > > > I don't care and it has absolutel no business being discussed here. My question was genuine. If you think the code is dog shit I will make no argument for merging it. I just get hives from looking at proprietary code so I was hoping someone could explain how the proprietary stacks get it done. > > FYI at leat iWarp is a totally open standard. And I'm sure someone cares about that. I care about open source. I think people in the networking world have a deeper understanding of standardization processes, and their practical implication for open source and hack-ability. If all usable implementations are proprietary the standard could as well not exist. That may be a little hard to understand for folks coming from storage and fabric worlds where the interesting bits of the implementation was pretty much always closed. > So is Infiniband, Jakub has a unique definition of "proprietary". For IB AFAIU there's only one practically usable vendor, such an impressive ecosystem!! > RDMA works with the AMD and Intel intree drivers using DMABUF without > requiring struct pages using the DRM hacky scatterlist approach. I see, thanks. We need pages primarily for refcounting. Avoiding all the infamous problems with memory pins. Oh well.