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From: Christoph Hellwig <hch@lst.de>
To: Jason Gunthorpe <jgg@ziepe.ca>
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, megaraidlinux.pdl@broadcom.com,
	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 08/13] IB/iser: set virt_boundary_mask in the scsi host
Date: Thu, 6 Jun 2019 16:19:50 +0200	[thread overview]
Message-ID: <20190606141950.GB15112@lst.de> (raw)
In-Reply-To: <20190606125935.GA17373@ziepe.ca>

On Thu, Jun 06, 2019 at 09:59:35AM -0300, Jason Gunthorpe wrote:
> > Until we've sorted that out the device paramter needs to be set to
> > the smallest value supported.
> 
> smallest? largest? We've been setting it to the largest value the
> device can handle (ie 2G)

Well, in general we need the smallest value supported by any ULP,
because if any ULP can't support a larger segment size, we must not
allow the IOMMU to merge it to that size.  That being said I can't
really see why any RDMA ULP should limit the size given how the MRs
work.

WARNING: multiple messages have this Message-ID (diff)
From: hch@lst.de (Christoph Hellwig)
Subject: [PATCH 08/13] IB/iser: set virt_boundary_mask in the scsi host
Date: Thu, 6 Jun 2019 16:19:50 +0200	[thread overview]
Message-ID: <20190606141950.GB15112@lst.de> (raw)
In-Reply-To: <20190606125935.GA17373@ziepe.ca>

On Thu, Jun 06, 2019@09:59:35AM -0300, Jason Gunthorpe wrote:
> > Until we've sorted that out the device paramter needs to be set to
> > the smallest value supported.
> 
> smallest? largest? We've been setting it to the largest value the
> device can handle (ie 2G)

Well, in general we need the smallest value supported by any ULP,
because if any ULP can't support a larger segment size, we must not
allow the IOMMU to merge it to that size.  That being said I can't
really see why any RDMA ULP should limit the size given how the MRs
work.

  reply	other threads:[~2019-06-06 14:20 UTC|newest]

Thread overview: 67+ 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 ` 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   ` 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   ` 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   ` Christoph Hellwig
2019-06-05 19:08 ` [PATCH 04/13] mmc: " Christoph Hellwig
2019-06-05 19:08   ` 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   ` 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   ` Christoph Hellwig
2019-06-05 19:08 ` [PATCH 07/13] storvsc: set virt_boundary_mask " Christoph Hellwig
2019-06-05 19:08   ` 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 19:08   ` Christoph Hellwig
2019-06-05 20:22   ` Jason Gunthorpe
2019-06-05 20:22     ` Jason Gunthorpe
2019-06-05 23:35     ` Sagi Grimberg
2019-06-05 23:35       ` Sagi Grimberg
2019-06-06  6:24     ` Christoph Hellwig
2019-06-06  6:24       ` Christoph Hellwig
2019-06-06 12:59       ` Jason Gunthorpe
2019-06-06 12:59         ` Jason Gunthorpe
2019-06-06 14:19         ` Christoph Hellwig [this message]
2019-06-06 14:19           ` Christoph Hellwig
2019-06-05 19:08 ` [PATCH 09/13] IB/srp: " Christoph Hellwig
2019-06-05 19:08   ` Christoph Hellwig
2019-06-05 19:08 ` [PATCH 10/13] megaraid_sas: " Christoph Hellwig
2019-06-05 19:08   ` Christoph Hellwig
2019-06-06  6:02   ` Hannes Reinecke
2019-06-06  6:02     ` Hannes Reinecke
2019-06-06  6:41     ` Christoph Hellwig
2019-06-06  6:41       ` Christoph Hellwig
2019-06-06 15:37   ` Kashyap Desai
2019-06-06 15:37     ` Kashyap Desai
2019-06-08  8:14     ` Christoph Hellwig
2019-06-08  8:14       ` Christoph Hellwig
2019-06-13 19:58       ` Kashyap Desai
2019-06-13 19:58         ` Kashyap Desai
2019-06-13 19:58         ` Kashyap Desai
2019-06-17  8:44         ` Christoph Hellwig
2019-06-17  8:44           ` Christoph Hellwig
2019-06-17  9:10           ` Kashyap Desai
2019-06-17  9:10             ` Kashyap Desai
2019-06-13  8:44     ` Christoph Hellwig
2019-06-13  8:44       ` Christoph Hellwig
2019-06-13 20:04       ` Kashyap Desai
2019-06-13 20:04         ` Kashyap Desai
2019-06-05 19:08 ` [PATCH 11/13] mpt3sas: " Christoph Hellwig
2019-06-05 19:08   ` Christoph Hellwig
2019-06-05 19:08 ` [PATCH 12/13] usb-storage: " Christoph Hellwig
2019-06-05 19:08   ` Christoph Hellwig
2019-06-05 19:08 ` [PATCH 13/13] uas: " Christoph Hellwig
2019-06-05 19:08   ` Christoph Hellwig
2019-06-05 19:17 ` properly communicate queue limits to the DMA layer Jens Axboe
2019-06-05 19:17   ` Jens Axboe
2019-06-05 19:24   ` Christoph Hellwig
2019-06-05 19:24     ` Christoph Hellwig
2019-06-07  5:52     ` Jens Axboe
2019-06-07  5:52       ` Jens Axboe
2019-06-07 17:30       ` Martin K. Petersen
2019-06-07 17:30         ` Martin K. Petersen
2019-06-08  8:10         ` Jens Axboe
2019-06-08  8:10           ` Jens Axboe

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