From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from ale.deltatee.com (ale.deltatee.com [204.191.154.188]) (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 3B86C3AFCED; Fri, 18 Sep 2026 22:07:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=204.191.154.188 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789769236; cv=none; b=urYxUdJ6DsNJF7hVj/T+keVU/8HmlTvwB1Lp2712ClR7yU0X4wELL0lTkOvreb7jYYCaGpxoJ1tttMY7UrMyOIGhFH94vM/Tug3eIxMmk9b0y+CAQauI2T6B1Rv2z7+syfAckm3U/wMAEgWtEd7kO4OBpppFzgrJ/Vbob6psUjo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789769236; c=relaxed/simple; bh=/c1oMlmLTWJaN6avLnnwg95XZGTSRowOmDi8dACzT6g=; h=Message-ID:Date:MIME-Version:To:Cc:References:From:In-Reply-To: Content-Type:Subject; b=dAvMFvZquEPKcP1qMkaIBNf1awbnSTI3GkSOJBfHefQqbmDe0/IjbgPPDEop0fGVgChGxJf0pm/8ZJWNlGL7oezyZZUul6u7cjClUI2FWPEexQ8eIq+tB0FuqPGJHkW0obaaQqMvtIzv/Fp3DD0kWOY2PQ+uRmm9hE6UTKtmeTE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=deltatee.com; spf=pass smtp.mailfrom=deltatee.com; dkim=pass (2048-bit key) header.d=deltatee.com header.i=@deltatee.com header.b=NatcX72N; arc=none smtp.client-ip=204.191.154.188 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=deltatee.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=deltatee.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=deltatee.com header.i=@deltatee.com header.b="NatcX72N" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=deltatee.com; s=20200525; h=Subject:In-Reply-To:From:References:Cc:To: MIME-Version:Date:Message-ID:content-disposition; bh=m94KH1rUE8xsCRUl4tYdgtiOBSbe9rGzqg8G+EWYrUw=; b=NatcX72NhP8Ze5rzpAsyRpUcdz FRPn6jS30hDGnefYxuDW0GkBaqg7MW48ZwDR0idErdzBHZUekbclVL44XaibfKaaZP9r/bM9mkDbD /oLY18+T20Vaq0isjzqm1AVuf0bC3P8M3+q52j9/jmXCUGHMz92M677710hG5qzR3NsUDuBjTjLgm TyNzT1XctON/nZCdB4mcZ3BWHznHMhOcsHhPLeb1mRP2caOwURJ3wLJi0H3bBpcbrrtuPZaorvDYe 0L8T3j227XdyusqKBPRmoc8qoVOuXKzLEaKivPhHiFk0qbgxJ12d/VhLO8BBZye8CxEb7M58xRli5 sCK0wg0w==; Received: from guinness.priv.deltatee.com ([172.16.1.162]) by ale.deltatee.com with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.98.2) (envelope-from ) id 1x7gje-0000000Ctdy-3n0O; Fri, 18 Sep 2026 16:07:11 -0600 Message-ID: <0671be58-45d0-4448-a83f-eeae466c22cb@deltatee.com> Date: Fri, 18 Sep 2026 16:07:08 -0600 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: Leon Romanovsky , Bjorn Helgaas , Chaitanya Kulkarni , Greg Kroah-Hartman , Jens Axboe , Alex Williamson , Ankit Agrawal , Jason Gunthorpe , Jonathan Corbet , Shuah Khan , "Joerg Roedel (AMD)" , Will Deacon , Robin Murphy , Randy Dunlap , Sumit Semwal , =?UTF-8?Q?Christian_K=C3=B6nig?= Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, iommu@lists.linux.dev, Tushar Dave , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-rdma@vger.kernel.org, kvm@vger.kernel.org References: <20260914-fix-p2p-acs-v4-0-v6-0-5ef07ec9ef06@nvidia.com> <20260914-fix-p2p-acs-v4-0-v6-9-5ef07ec9ef06@nvidia.com> Content-Language: en-CA From: Logan Gunthorpe In-Reply-To: <20260914-fix-p2p-acs-v4-0-v6-9-5ef07ec9ef06@nvidia.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 172.16.1.162 X-SA-Exim-Rcpt-To: leon@kernel.org, bhelgaas@google.com, kch@nvidia.com, gregkh@linuxfoundation.org, axboe@kernel.dk, alex@shazbot.org, ankita@nvidia.com, jgg@ziepe.ca, corbet@lwn.net, skhan@linuxfoundation.org, joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, rdunlap@infradead.org, sumit.semwal@linaro.org, christian.koenig@amd.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, iommu@lists.linux.dev, tdave@nvidia.com, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-rdma@vger.kernel.org, kvm@vger.kernel.org X-SA-Exim-Mail-From: logang@deltatee.com X-Spam-Level: Subject: Re: [PATCH v6 09/18] PCI/P2PDMA: Route Relaxed Ordering Completions directly X-SA-Exim-Version: 4.2.1 (built Sun, 23 Feb 2025 07:57:16 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) On 2026-09-14 05:22, Leon Romanovsky wrote: > From: Leon Romanovsky > > ACS P2P Completion Redirect leaves Completions carrying the Relaxed > Ordering attribute alone. PCIe r7.0 sec 6.12.1.1 redirects only those "that > do not have the Relaxed Ordering Attribute bit set", and sec 7.7.12.5 > describes the enable bit as "applicable only to Completions whose Relaxed > Ordering Attribute is clear". P2PDMA reports one answer for every kind of > TLP, so a client whose provider returns such Completions is sent through > the host bridge for a redirect that never happens to it. > > Add enum pci_p2pdma_tlp_flags and let a caller state that property. > > Signed-off-by: Leon Romanovsky Reviewed-by: Logan Gunthorpe