linux-kernel - Re: [PATCH v4 00/14] Copy Offload in NVMe Fabrics with P2P PCI Memory

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Message-ID: <805645c1-ea40-2e57-88eb-5dd34e579b2e@deltatee.com>
Date:   Wed, 2 May 2018 09:56:09 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Christian König <christian.koenig@....com>,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-rdma@...r.kernel.org,
        linux-nvdimm@...ts.01.org, linux-block@...r.kernel.org
Cc:     Stephen Bates <sbates@...thlin.com>,
        Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        Keith Busch <keith.busch@...el.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Alex Williamson <alex.williamson@...hat.com>
Subject: Re: [PATCH v4 00/14] Copy Offload in NVMe Fabrics with P2P PCI Memory

Hi Christian,

On 5/2/2018 5:51 AM, Christian König wrote:
> it would be rather nice to have if you could separate out the functions 
> to detect if peer2peer is possible between two devices.

This would essentially be pci_p2pdma_distance() in the existing 
patchset. It returns the sum of the distance between a list of clients 
and a P2PDMA provider. It returns -1 if peer2peer is not possible 
between the devices (presently this means they are not behind the same 
root port).

Logan