From: Logan Gunthorpe <logang@deltatee.com>
To: "Leon Romanovsky" <leon@kernel.org>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Chaitanya Kulkarni" <kch@nvidia.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Jens Axboe" <axboe@kernel.dk>,
"Alex Williamson" <alex@shazbot.org>,
"Ankit Agrawal" <ankita@nvidia.com>,
"Jason Gunthorpe" <jgg@ziepe.ca>,
"Jonathan Corbet" <corbet@lwn.net>,
"Shuah Khan" <skhan@linuxfoundation.org>,
"Joerg Roedel (AMD)" <joro@8bytes.org>,
"Will Deacon" <will@kernel.org>,
"Robin Murphy" <robin.murphy@arm.com>,
"Randy Dunlap" <rdunlap@infradead.org>,
"Sumit Semwal" <sumit.semwal@linaro.org>,
"Christian König" <christian.koenig@amd.com>
Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-doc@vger.kernel.org, iommu@lists.linux.dev,
Tushar Dave <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
Subject: Re: [PATCH v6 09/18] PCI/P2PDMA: Route Relaxed Ordering Completions directly
Date: Fri, 18 Sep 2026 16:07:08 -0600 [thread overview]
Message-ID: <0671be58-45d0-4448-a83f-eeae466c22cb@deltatee.com> (raw)
In-Reply-To: <20260914-fix-p2p-acs-v4-0-v6-9-5ef07ec9ef06@nvidia.com>
On 2026-09-14 05:22, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@nvidia.com>
>
> 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 <leonro@nvidia.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
next prev parent reply other threads:[~2026-09-18 22:07 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-14 11:22 [PATCH v6 00/18] PCI/P2PDMA: Route peer-to-peer DMA by TLP class Leon Romanovsky
2026-09-14 11:22 ` [PATCH v6 01/18] PCI/P2PDMA: Document pdev->p2pdma lifetime rules Leon Romanovsky
2026-09-18 18:25 ` Logan Gunthorpe
2026-09-19 4:39 ` Leon Romanovsky
2026-09-14 11:22 ` [PATCH v6 02/18] PCI/P2PDMA: Document the TLP attribute assumptions Leon Romanovsky
2026-09-14 11:22 ` [PATCH v6 03/18] PCI/P2PDMA: Derive routing from directional ACS controls Leon Romanovsky
2026-09-18 19:39 ` Logan Gunthorpe
2026-09-14 11:22 ` [PATCH v6 04/18] PCI: Reject unreadable ACS controls in isolation checks Leon Romanovsky
2026-09-18 19:59 ` Logan Gunthorpe
2026-09-14 11:22 ` [PATCH v6 05/18] PCI/P2PDMA: Evaluate ACS controls at the path divergence Leon Romanovsky
2026-09-18 20:07 ` Logan Gunthorpe
2026-09-14 11:22 ` [PATCH v6 06/18] PCI/P2PDMA: Document directional ACS routing Leon Romanovsky
2026-09-18 20:53 ` Logan Gunthorpe
2026-09-14 11:22 ` [PATCH v6 07/18] PCI/P2PDMA: Collect the path's ACS controls before deciding Leon Romanovsky
2026-09-18 21:11 ` Logan Gunthorpe
2026-09-14 11:22 ` [PATCH v6 08/18] PCI/P2PDMA: Answer routing per TLP class Leon Romanovsky
2026-09-18 21:55 ` Logan Gunthorpe
2026-09-14 11:22 ` [PATCH v6 09/18] PCI/P2PDMA: Route Relaxed Ordering Completions directly Leon Romanovsky
2026-09-18 22:07 ` Logan Gunthorpe [this message]
2026-09-14 11:22 ` [PATCH v6 10/18] PCI/P2PDMA: Reject Translated Requests blocked by Translation Blocking Leon Romanovsky
2026-09-14 11:22 ` [PATCH v6 11/18] PCI/P2PDMA: Route Translated Requests under Direct Translated P2P Leon Romanovsky
2026-09-14 11:22 ` [PATCH v6 12/18] PCI/P2PDMA: Log detailed ACS routing diagnostics Leon Romanovsky
2026-09-14 11:22 ` [PATCH v6 13/18] PCI/P2PDMA: Add KUnit tests for the ACS routing decisions Leon Romanovsky
2026-09-14 11:22 ` [PATCH v6 14/18] PCI/P2PDMA: Test the ACS P2P routing walk Leon Romanovsky
2026-09-14 11:22 ` [PATCH v6 15/18] PCI: Add KUnit coverage for ACS isolation checks Leon Romanovsky
2026-09-14 11:22 ` [PATCH v6 16/18] PCI/P2PDMA: Document TLP-class routing Leon Romanovsky
2026-09-14 11:22 ` [PATCH v6 17/18] dma-buf: Let importers ask how peer-to-peer traffic is routed Leon Romanovsky
2026-09-14 14:27 ` Christian König
2026-09-14 22:10 ` Jason Gunthorpe
2026-09-15 6:28 ` Leon Romanovsky
2026-09-15 6:23 ` Leon Romanovsky
2026-09-14 11:22 ` [PATCH v6 18/18] RDMA/mlx5: Ask P2PDMA whether ATS takes a direct peer-to-peer route Leon Romanovsky
2026-09-17 13:56 ` Thomas Hellström
2026-09-17 14:00 ` Christian König
2026-09-17 14:28 ` Jason Gunthorpe
2026-09-17 14:02 ` Jason Gunthorpe
2026-09-17 14:16 ` Thomas Hellström
2026-09-17 15:15 ` Jason Gunthorpe
2026-09-18 12:15 ` Leon Romanovsky
2026-09-18 13:42 ` Thomas Hellström
2026-09-18 17:05 ` Jason Gunthorpe
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