Netdev Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Christoph Hellwig <hch@lst.de>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: Daniel Vetter <daniel@ffwll.ch>,
	Matthew Wilcox <willy@infradead.org>,
	nvdimm@lists.linux.dev, linux-rdma@vger.kernel.org,
	John Hubbard <jhubbard@nvidia.com>,
	linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
	Ming Lei <ming.lei@redhat.com>,
	linux-block@vger.kernel.org, linux-mm@kvack.org,
	netdev@vger.kernel.org, Joao Martins <joao.m.martins@oracle.com>,
	Logan Gunthorpe <logang@deltatee.com>,
	Christoph Hellwig <hch@lst.de>
Subject: Re: Phyr Starter
Date: Thu, 20 Jan 2022 15:09:39 +0100	[thread overview]
Message-ID: <20220120140939.GA11707@lst.de> (raw)
In-Reply-To: <20220111202648.GP2328285@nvidia.com>

On Tue, Jan 11, 2022 at 04:26:48PM -0400, Jason Gunthorpe wrote:
> What I did in RDMA was make an iterator rdma_umem_for_each_dma_block()
> 
> The driver passes in the page size it wants and the iterator breaks up
> the SGL into that size.
> 
> So, eg on a 16k page size system the SGL would be full of 16K stuff,
> but the driver only support 4k and so the iterator hands out 4 pages
> for each SGL entry.
> 
> All the drivers use this to build their DMA lists and tables, it works
> really well.

The block layer also has the equivalent functionality by setting the
virt_boundary value in the queue_limits.  This is needed for NVMe
PRPs and RDMA drivers.

  reply	other threads:[~2022-01-20 14:09 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-10 19:34 Matthew Wilcox
2022-01-11  0:41 ` Jason Gunthorpe
2022-01-11  4:32   ` Matthew Wilcox
2022-01-11 15:01     ` Jason Gunthorpe
2022-01-11 18:33       ` Matthew Wilcox
2022-01-11 20:21         ` Jason Gunthorpe
2022-01-11 21:25           ` Matthew Wilcox
2022-01-11 22:09             ` Logan Gunthorpe
2022-01-11 22:57               ` Jason Gunthorpe
2022-01-11 23:02                 ` Logan Gunthorpe
2022-01-11 22:53             ` Jason Gunthorpe
2022-01-11 22:57               ` Logan Gunthorpe
2022-01-11 23:02                 ` Jason Gunthorpe
2022-01-11 23:08                   ` Logan Gunthorpe
2022-01-12 18:37               ` Matthew Wilcox
2022-01-12 19:08                 ` Jason Gunthorpe
2022-01-20 14:03                 ` Christoph Hellwig
2022-01-20 17:17                   ` Jason Gunthorpe
2022-01-20 14:00       ` Christoph Hellwig
2022-01-11  9:05   ` Daniel Vetter
2022-01-11 20:26     ` Jason Gunthorpe
2022-01-20 14:09       ` Christoph Hellwig [this message]
2022-01-20 13:56   ` Christoph Hellwig
2022-01-20 15:27     ` Keith Busch
2022-01-20 15:28       ` Christoph Hellwig
2022-01-20 17:54       ` Robin Murphy
2022-01-11  8:17 ` John Hubbard
2022-01-11 14:01   ` Matthew Wilcox
2022-01-11 15:02     ` Jason Gunthorpe
2022-01-11 17:31   ` Logan Gunthorpe
2022-01-20 14:12   ` Christoph Hellwig
2022-01-20 21:35     ` John Hubbard
2022-01-11 11:40 ` Thomas Zimmermann
2022-01-11 13:56   ` Matthew Wilcox
2022-01-11 14:10     ` Thomas Zimmermann
2022-01-20 13:39 ` Christoph Hellwig

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20220120140939.GA11707@lst.de \
    --to=hch@lst.de \
    --cc=daniel@ffwll.ch \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=jgg@nvidia.com \
    --cc=jhubbard@nvidia.com \
    --cc=joao.m.martins@oracle.com \
    --cc=linux-block@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=linux-rdma@vger.kernel.org \
    --cc=logang@deltatee.com \
    --cc=ming.lei@redhat.com \
    --cc=netdev@vger.kernel.org \
    --cc=nvdimm@lists.linux.dev \
    --cc=willy@infradead.org \
    --subject='Re: Phyr Starter' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).