linux-kernel - Re: [PATCH v9 23/24] nvme-pci: convert to blk_rq_dma

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Message-ID: <20250423154712.GA32009@lst.de>
Date: Wed, 23 Apr 2025 17:47:12 +0200
From: Christoph Hellwig <hch@....de>
To: Leon Romanovsky <leon@...nel.org>
Cc: Christoph Hellwig <hch@....de>, Keith Busch <kbusch@...nel.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Jens Axboe <axboe@...nel.dk>, Jake Edge <jake@....net>,
	Jonathan Corbet <corbet@....net>, Jason Gunthorpe <jgg@...pe.ca>,
	Zhu Yanjun <zyjzyj2000@...il.com>,
	Robin Murphy <robin.murphy@....com>, Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>, Sagi Grimberg <sagi@...mberg.me>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Logan Gunthorpe <logang@...tatee.com>,
	Yishai Hadas <yishaih@...dia.com>,
	Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
	Kevin Tian <kevin.tian@...el.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Jérôme Glisse <jglisse@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-block@...r.kernel.org, linux-rdma@...r.kernel.org,
	iommu@...ts.linux.dev, linux-nvme@...ts.infradead.org,
	linux-pci@...r.kernel.org, kvm@...r.kernel.org, linux-mm@...ck.org,
	Niklas Schnelle <schnelle@...ux.ibm.com>,
	Chuck Lever <chuck.lever@...cle.com>,
	Luis Chamberlain <mcgrof@...nel.org>,
	Matthew Wilcox <willy@...radead.org>,
	Dan Williams <dan.j.williams@...el.com>,
	Kanchan Joshi <joshi.k@...sung.com>,
	Chaitanya Kulkarni <kch@...dia.com>,
	Nitesh Shetty <nj.shetty@...sung.com>
Subject: Re: [PATCH v9 23/24] nvme-pci: convert to blk_rq_dma_map

On Wed, Apr 23, 2025 at 01:03:14PM +0300, Leon Romanovsky wrote:
> On Wed, Apr 23, 2025 at 11:24:37AM +0200, Christoph Hellwig wrote:
> > I don't think the meta SGL handling is quite right yet, and the
> > single segment data handling also regressed.  Totally untested
> > patch below, I'll try to allocate some testing time later today.
> 
> Christoph,
> 
> Can we please progress with the DMA patches and leave NVMe for later?
> NVMe is one the users for new DMA API, let's merge API first.

We'll need to merge the block/nvme patches through the block tree
anyway to avoid merges from hell, so yes.