From: Christoph Hellwig <hch@lst.de>
To: Kashyap Desai <kashyap.desai@broadcom.com>
Cc: Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
Sebastian Ott <sebott@linux.ibm.com>,
Sagi Grimberg <sagi@grimberg.me>,
Max Gurtovoy <maxg@mellanox.com>,
Bart Van Assche <bvanassche@acm.org>,
Ulf Hansson <ulf.hansson@linaro.org>,
Alan Stern <stern@rowland.harvard.edu>,
Oliver Neukum <oneukum@suse.com>,
linux-block@vger.kernel.org, linux-rdma@vger.kernel.org,
linux-mmc@vger.kernel.org, linux-nvme@lists.infradead.org,
linux-scsi@vger.kernel.org,
"PDL,MEGARAIDLINUX" <megaraidlinux.pdl@broadcom.com>,
PDL-MPT-FUSIONLINUX <mpt-fusionlinux.pdl@broadcom.com>,
linux-hyperv@vger.kernel.org, linux-usb@vger.kernel.org,
usb-storage@lists.one-eyed-alien.net,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 10/13] megaraid_sas: set virt_boundary_mask in the scsi host
Date: Mon, 17 Jun 2019 10:44:33 +0200 [thread overview]
Message-ID: <20190617084433.GA7969@lst.de> (raw)
In-Reply-To: <98f6557ae91a7cdfe8069fcf7d788c88@mail.gmail.com>
On Fri, Jun 14, 2019 at 01:28:47AM +0530, Kashyap Desai wrote:
> Is there any changes in API blk_queue_virt_boundary? I could not find
> relevant code which account for this. Can you help ?
> Which git repo shall I use for testing ? That way I can confirm, I didn't
> miss relevant changes.
Latest mainline plus the series (which is about to get resent).
blk_queue_virt_boundary now forced an unlimited max_hw_sectors as that
is how PRP-like schemes work, to work around a block driver merging
bug. But we also need to communicate that limit to the DMA layer so
that we don't set a smaller iommu segment size limitation.
> >From your above explanation, it means (after this patch) max segment size
> of the MR controller will be set to 4K.
> Earlier it is possible to receive single SGE of 64K datalength (Since max
> seg size was 64K), but now the same buffer will reach the driver having 16
> SGEs (Each SGE will contain 4K length).
No, there is no more limit for the size of the segment at all,
as for PRPs each PRP is sort of a segment from the hardware perspective.
We just require the segments to not have gaps, as PRPs don't allow for
that.
That being said I think these patches are wrong for the case of megaraid
or mpt having both NVMe and SAS/ATA devices behind a single controller.
Is that a valid configuration?
next prev parent reply other threads:[~2019-06-17 8:45 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-05 19:08 properly communicate queue limits to the DMA layer Christoph Hellwig
2019-06-05 19:08 ` [PATCH 01/13] nvme-pci: don't limit DMA segement size Christoph Hellwig
2019-06-05 19:08 ` [PATCH 02/13] rsxx: don't call dma_set_max_seg_size Christoph Hellwig
2019-06-05 19:08 ` [PATCH 03/13] mtip32xx: also set max_segment_size in the device Christoph Hellwig
2019-06-05 19:08 ` [PATCH 04/13] mmc: " Christoph Hellwig
2019-06-05 19:08 ` [PATCH 05/13] scsi: add a host / host template field for the virt boundary Christoph Hellwig
2019-06-05 19:08 ` [PATCH 06/13] ufshcd: set max_segment_size in the scsi host template Christoph Hellwig
2019-06-05 19:08 ` [PATCH 07/13] storvsc: set virt_boundary_mask " Christoph Hellwig
2019-06-05 19:08 ` [PATCH 08/13] IB/iser: set virt_boundary_mask in the scsi host Christoph Hellwig
2019-06-05 20:22 ` Jason Gunthorpe
2019-06-05 23:35 ` Sagi Grimberg
2019-06-06 6:24 ` Christoph Hellwig
2019-06-06 12:59 ` Jason Gunthorpe
2019-06-06 14:19 ` Christoph Hellwig
2019-06-05 19:08 ` [PATCH 09/13] IB/srp: " Christoph Hellwig
2019-06-05 19:08 ` [PATCH 10/13] megaraid_sas: " Christoph Hellwig
2019-06-06 6:02 ` Hannes Reinecke
2019-06-06 6:41 ` Christoph Hellwig
2019-06-06 15:37 ` Kashyap Desai
2019-06-08 8:14 ` Christoph Hellwig
2019-06-13 19:58 ` Kashyap Desai
2019-06-17 8:44 ` Christoph Hellwig [this message]
2019-06-17 9:10 ` Kashyap Desai
2019-06-13 8:44 ` Christoph Hellwig
2019-06-13 20:04 ` Kashyap Desai
2019-06-05 19:08 ` [PATCH 11/13] mpt3sas: " Christoph Hellwig
2019-06-05 19:08 ` [PATCH 12/13] usb-storage: " Christoph Hellwig
2019-06-05 19:08 ` [PATCH 13/13] uas: " Christoph Hellwig
2019-06-05 19:17 ` properly communicate queue limits to the DMA layer Jens Axboe
2019-06-05 19:24 ` Christoph Hellwig
2019-06-07 5:52 ` Jens Axboe
2019-06-07 17:30 ` Martin K. Petersen
2019-06-08 8:10 ` Jens Axboe
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