From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 2DC6822DFA6; Mon, 21 Jul 2025 07:03:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753081425; cv=none; b=KIQ+/1iwd8RB/wNVvEnPbaYUvycHcxwtcbD7QrPuhyZUg/92Ug8zs6a2HIPci1S+R+Bf+agDTCWV603A2W6/8SGr+im3X7ReLGfr+arMPGAbFkeZW9utZj9iu0w776K3DFU3gUq0Q3cD7lBZtrxH/v/VUo/Y5DdixfHCGIBEnYA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753081425; c=relaxed/simple; bh=I6akz5pfbU/lPQwpnOci9Fnqx87HkGhMiK0UmMzmsjY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=pfOde7fK4XOCl9pCLCK6NI+B63TwWNU6zwpuK0Auc02C5yKsrRm6tgGQCHXPSkWSeO7l1hbyzQVtyVonVfxVa2NukRdjnM/864FAzqRfd7orzxGxb6uTnECn9u18r2RHtcz7/YI/TknvYjb1tBgBfYOq8QKQZMQ5nzrYAznZuH8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=VLQInbT8; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="VLQInbT8" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=Re4nL4seh/u3rx2kBv4ujkDzUbNHaaKK5HUMeMxVLyo=; b=VLQInbT8BzS3WF2wguK3ElN1iN EBK9JoQe1L5sTZUvS4SJdj25s8ENLEbcU5jrkqdG2Wl3XU3aXqJ/Wvb6AlqD0QDxJkGkHS+U/FNRA fmYAHcH3fU6qn0TBzOkQlPFkT8HHNSfQxny60x0WNb+XI9sLT/NlRtgX/9GH/S0aA2Kin3xz+Kb1j kSkXmswblVe/5kGmWbVVZAEFDrOuSz/UkBOW4aZoBkccyOPc9Yp1ExwWh5MDG+Pl3IHZfxKMWRTlE ZJzrUaXQVpi5C02AhTravzmhWMTzx6rojxQT0sEv6mDDzHWUbHLJZk4I/rwSdW3FFApRZhcSErdKo DGKsP39g==; Received: from hch by bombadil.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1udkYn-0000000GSC7-13Y2; Mon, 21 Jul 2025 07:03:41 +0000 Date: Mon, 21 Jul 2025 00:03:41 -0700 From: Christoph Hellwig To: Yonatan Maman Cc: =?iso-8859-1?B?Suly9G1l?= Glisse , Andrew Morton , Jason Gunthorpe , Leon Romanovsky , Lyude Paul , Danilo Krummrich , David Airlie , Simona Vetter , Alistair Popple , Ben Skeggs , Michael Guralnik , Or Har-Toov , Daisuke Matsuda , Shay Drory , linux-mm@kvack.org, linux-rdma@vger.kernel.org, dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org, linux-kernel@vger.kernel.org, Gal Shalom Subject: Re: [PATCH v2 4/5] RDMA/mlx5: Enable P2P DMA with fallback mechanism Message-ID: References: <20250718115112.3881129-1-ymaman@nvidia.com> <20250718115112.3881129-5-ymaman@nvidia.com> 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: <20250718115112.3881129-5-ymaman@nvidia.com> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html On Fri, Jul 18, 2025 at 02:51:11PM +0300, Yonatan Maman wrote: > From: Yonatan Maman > > Add support for P2P for MLX5 NIC devices with automatic fallback to > standard DMA when P2P mapping fails. That's now how the P2P API works. You need to check the P2P availability higher up.