netdev - Re: the XSK buffer pool needs be to reverted

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Message-ID: <20200626205412.xfe4lywdbmh3kmri@bsd-mbp>
Date:   Fri, 26 Jun 2020 13:54:12 -0700
From:   Jonathan Lemon <jonathan.lemon@...il.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Björn Töpel <bjorn.topel@...el.com>,
        Alexander Duyck <alexander.duyck@...il.com>,
        netdev@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: the XSK buffer pool needs be to reverted

On Fri, Jun 26, 2020 at 09:47:25AM +0200, Christoph Hellwig wrote:
>
> Note that this is somewhat urgent, as various of the APIs that the code
> is abusing are slated to go away for Linux 5.9, so this addition comes
> at a really bad time.

Could you elaborate on what is upcoming here?


Also, on a semi-related note, are there limitations on how many pages
can be left mapped by the iommu?  Some of the page pool work involves
leaving the pages mapped instead of constantly mapping/unmapping them.

On a heavily loaded box with iommu enabled, it seems that quite often
there is contention on the iova_lock.  Are there known issues in this
area?
-- 
Jonathan