linux-kernel - Re: [PATCH v2 03/14] PCI/P2PDMA: Add constants for not-supported result upstream_bridge

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Message-ID: <20190807055455.GA6627@lst.de>
Date:   Wed, 7 Aug 2019 07:54:55 +0200
From:   Christoph Hellwig <hch@....de>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-rdma@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Christoph Hellwig <hch@....de>,
        Christian Koenig <Christian.Koenig@....com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Dan Williams <dan.j.williams@...el.com>,
        Eric Pilmore <epilmore@...aio.com>,
        Stephen Bates <sbates@...thlin.com>
Subject: Re: [PATCH v2 03/14] PCI/P2PDMA: Add constants for not-supported
 result upstream_bridge_distance()

On Tue, Jul 30, 2019 at 10:35:34AM -0600, Logan Gunthorpe wrote:
> Add constant flags to indicate two devices are not supported or whether
> the data path goes through the host bridge instead of using the negative
> values -1 and -2.
> 
> This helps annotate the code better, but the main reason is so we
> can use the information to store the required mapping method in an
> xarray.
> 
> Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
> Reviewed-by: Christian König <christian.koenig@....com>

Is there really no way to keep the distance separate from the type of
the connection as I requested?  I think that would avoid a lot of
confusion down the road.