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Re: [PATCH V2] net: ethernet: mellanox: correct page conversion

From Christoph Hellwig <hch@infradead.org>
Newsgroups linux.kernel
Subject Re: [PATCH V2] net: ethernet: mellanox: correct page conversion
Date 2016-04-18 15:20 +0200
Message-ID <rphfR-6dw-29@gated-at.bofh.it> (permalink)
References <roGT0-2e3-15@gated-at.bofh.it> <rpgjN-5u2-17@gated-at.bofh.it> <rph6b-69y-27@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Mon, Apr 18, 2016 at 09:06:18AM -0400, okaya@codeaurora.org wrote:
> On 2016-04-18 08:12, Christoph Hellwig wrote:
> >On Sat, Apr 16, 2016 at 06:23:32PM -0400, Sinan Kaya wrote:
> >>Current code is assuming that the address returned by dma_alloc_coherent
> >>is a logical address. This is not true on ARM/ARM64 systems.
> >
> >Can you explain what you mean with a 'logical address' and what actual
> >issue you're trying to solve?
> 
> Vmap call is failing on arm64 systems because dma alloc api already returns
> an address mapped with vmap.

Please state your problem clearly.  What I'm reverse engineering from
your posts is:  because dma_alloc_coherent uses vmap-like mappings on
arm64 (all, some systems?) a driver using a lot of them might run into
limits of the vmap pool size.

Is this correct?

> 
> Please see arch/arm64/mm directory.
---end quoted text---

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Thread

[PATCH V2] net: ethernet: mellanox: correct page conversion Sinan Kaya <okaya@codeaurora.org> - 2016-04-17 00:30 +0200
  Re: [PATCH V2] net: ethernet: mellanox: correct page conversion David Miller <davem@davemloft.net> - 2016-04-18 06:10 +0200
    Re: [PATCH V2] net: ethernet: mellanox: correct page conversion okaya@codeaurora.org - 2016-04-18 07:10 +0200
      Re: [PATCH V2] net: ethernet: mellanox: correct page conversion David Miller <davem@davemloft.net> - 2016-04-18 18:00 +0200
        Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Sinan Kaya <okaya@codeaurora.org> - 2016-04-18 18:10 +0200
  Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Eli Cohen <eli@mellanox.com> - 2016-04-18 09:00 +0200
    Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Sinan Kaya <okaya@codeaurora.org> - 2016-04-18 16:00 +0200
      Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Eli Cohen <eli@mellanox.com> - 2016-04-18 16:30 +0200
    Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Christoph Hellwig <hch@infradead.org> - 2016-04-18 16:40 +0200
      RE: [PATCH V2] net: ethernet: mellanox: correct page conversion Eli Cohen <eli@mellanox.com> - 2016-04-18 17:00 +0200
        Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Christoph Hellwig <hch@infradead.org> - 2016-04-18 17:20 +0200
          Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Sinan Kaya <okaya@codeaurora.org> - 2016-04-18 17:30 +0200
            Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Christoph Hellwig <hch@infradead.org> - 2016-04-18 17:50 +0200
              Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Sinan Kaya <okaya@codeaurora.org> - 2016-04-18 19:50 +0200
              Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Sinan Kaya <okaya@codeaurora.org> - 2016-04-19 10:00 +0200
  Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Christoph Hellwig <hch@infradead.org> - 2016-04-18 14:20 +0200
    Re: [PATCH V2] net: ethernet: mellanox: correct page conversion okaya@codeaurora.org - 2016-04-18 15:10 +0200
      Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Christoph Hellwig <hch@infradead.org> - 2016-04-18 15:20 +0200
        Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Sinan Kaya <okaya@codeaurora.org> - 2016-04-18 15:50 +0200
          Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Christoph Hellwig <hch@infradead.org> - 2016-04-18 16:00 +0200
          Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Timur Tabi <timur@codeaurora.org> - 2016-04-18 17:20 +0200
            Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Sinan Kaya <okaya@codeaurora.org> - 2016-04-18 17:30 +0200
  Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Christoph Hellwig <hch@infradead.org> - 2016-04-19 20:30 +0200
    Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Sinan Kaya <okaya@codeaurora.org> - 2016-04-19 20:40 +0200
      Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Eran Ben Elisha <eranlinuxmellanox@gmail.com> - 2016-04-20 13:10 +0200
    Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Sinan Kaya <okaya@codeaurora.org> - 2016-04-20 15:40 +0200
      Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Timur Tabi <timur@codeaurora.org> - 2016-04-20 15:50 +0200
    Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Sinan Kaya <okaya@codeaurora.org> - 2016-04-20 15:40 +0200
      Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Eran Ben Elisha <eranlinuxmellanox@gmail.com> - 2016-04-20 20:50 +0200
        Re: [PATCH V2] net: ethernet: mellanox: correct page conversion Sinan Kaya <okaya@codeaurora.org> - 2016-04-20 20:50 +0200

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