netdev - Re: [LSF/MM/BPF proposal]: Physr discussion

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Message-ID: <bcd58332-c9ba-2c5e-71bb-3dabfa068856@nvidia.com>
Date:   Tue, 24 Jan 2023 06:15:18 +0000
From:   Chaitanya Kulkarni <chaitanyak@...dia.com>
To:     "lsf-pc@...ts.linuxfoundation.org" <lsf-pc@...ts.linuxfoundation.org>,
        Bart Van Assche <bvanassche@....org>,
        Jason Gunthorpe <jgg@...dia.com>,
        Matthew Wilcox <willy@...radead.org>
CC:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        Christoph Hellwig <hch@....de>,
        Joao Martins <joao.m.martins@...cle.com>,
        John Hubbard <jhubbard@...dia.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Ming Lei <ming.lei@...hat.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "nvdimm@...ts.linux.dev" <nvdimm@...ts.linux.dev>,
        Shakeel Butt <shakeelb@...gle.com>
Subject: Re: [LSF/MM/BPF proposal]: Physr discussion

On 1/23/23 11:47, Bart Van Assche wrote:
> On 1/23/23 05:44, Jason Gunthorpe wrote:
>> I've gone from quite a different starting point - I've been working
>> DMA API upwards, so what does the dma_map_XX look like, what APIs do
>> we need to support the dma_map_ops implementations to iterate/etc, how
>> do we form and return the dma mapped list, how does P2P, with all the
>> checks, actually work, etc. These help inform what we want from the
>> "phyr" as an API.
> 
> I'm interested in this topic. I'm wondering whether eliminating 
> scatterlists could help to make the block layer faster.
> 
> Thanks,
> 
> Bart.
> 

I think it will be very interesting to discuss this in great detail
and come up with the plan.

+1 from me.

-ck