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 33A4932AABF; Mon, 19 Jan 2026 18:34:24 +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=1768847665; cv=none; b=mIJ5+r+oeRsAykZFyk45YNb97kiBLwb92GBJRPa0s7pIQCWm4+kxdfL5fiasfL+N4xwFnvvxXvLrTx+3kA6FUK/NJrMt3VXDNl0A/3K+iVjUcN3rgeaqrD9hLYY6iHv10io8UrIgzbVrs1YNXVQ9z9zugryhEcL5c/rRMufB7s4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768847665; c=relaxed/simple; bh=kC7Zj4+slaVhN0XLjBUuk1dKiurvs5ZgBe29k50UZRU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=iWPGNa/s0v7Du6/IPP3HHb5R13xYjd0tatStyvV4YH1TrJBulnagomPvWblsuyoNsAC1mXnZfnRWiUqCPP7CQM7RzMzf97hcU4i51tkaHxG6V/7rRF11pvFmhYGr//MhoJQ4TVYVDBqAcWLGch32pm/LHYSCbw0k11+GUe5asLo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=oyrNY74r; 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="oyrNY74r" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5E6D4C116C6; Mon, 19 Jan 2026 18:34:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768847664; bh=kC7Zj4+slaVhN0XLjBUuk1dKiurvs5ZgBe29k50UZRU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=oyrNY74rnQ8quiv1V36gkrSUEMAZPyVcfAypqAIuMGU+tRwLVTtudqQp7vwcHpn0N W/0nWK/dE9uLMhIYIVjLV5siiGjiDeQwEqG6QGv0KUmJMVoDfqPS7TSaP+N/oXU2Wo nlpW2tbC7HGgEPqjidHXTSHwl3mFWnq1GMuumzXD2bls0fV1eXY1m5jU+3+3K4iIoH A9cOvRal599V2P1ZSk/OyaPMQQ+5XFybuWpUdmrEkgSMFFJ77dERGfjMOXJaQqo8yY h81HTtQa+LKoJxrP3NcJHooUTdc3cLQQ+Azz4EwcCzODnvtdzuIVuYKXRE9awS0AI9 WsIAZxCjf4bbQ== Date: Mon, 19 Jan 2026 20:34:20 +0200 From: Leon Romanovsky To: Christoph Hellwig Cc: Chuck Lever , Jason Gunthorpe , linux-rdma@vger.kernel.org, linux-nfs@vger.kernel.org, NeilBrown , Jeff Layton , Olga Kornievskaia , Dai Ngo , Tom Talpey , Chuck Lever Subject: Re: [PATCH v1 1/4] RDMA/core: add bio_vec based RDMA read/write API Message-ID: <20260119183420.GP13201@unreal> References: <20260114143948.3946615-1-cel@kernel.org> <20260114143948.3946615-2-cel@kernel.org> <20260115155334.GB14083@lst.de> <20260116212425.GJ14359@unreal> <20260119065212.GA1423@lst.de> <20260119102857.GI13201@unreal> <20260119120311.GA23572@lst.de> Precedence: bulk X-Mailing-List: linux-rdma@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260119120311.GA23572@lst.de> On Mon, Jan 19, 2026 at 01:03:11PM +0100, Christoph Hellwig wrote: > On Mon, Jan 19, 2026 at 12:28:57PM +0200, Leon Romanovsky wrote: > > > > I can add some code to this series to do that, but I don't believe > > > > I have facilities to test it. > > > > > > Please don't add untested code. If Leon wants the P2P support and > > > volunteers to test it, sure. > > > > I can do it with the help of how to setup the system. > > > > > But let's not merge it without being tested. And at least for NFS I don't > > > really see how P2P would easily fit in anyway. > > > > Chuck is proposing a new IB/core API that will also be used by NVMe too. > > Hopefully eventually, yes. Not in this series, though. Fair enough. > > > Wouldn't p2p be useful in the general case > > Well, P2P into a CMB might work in nfsd in theory now that there is > direct I/O support, but it'll require a lot of work. > > So if you want to help to convert nvmet, the series to do that would > be the right place to add P2P support, as with that we can actually > test it. If both of you plan to attend LSF/MM this year, and I receive an invitation as well, we can discuss the future p2p roadmap in person and how we want to move forward. Most of the items from our discussion last year [1] have already been completed or are on track for this or the next development cycle. The remaining big item which is left is removing SG from RDMA. Thanks [1] https://lore.kernel.org/all/20250122071600.GC10702@unreal/ >