linux-kernel - Re: [PATCH 0/7] hisi_sas: Misc bugfixes and an optimisation patch

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Message-ID: <20181011063603.GA3456@infradead.org>
Date:   Wed, 10 Oct 2018 23:36:03 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     John Garry <john.garry@...wei.com>, jejb@...ux.vnet.ibm.com,
        linuxarm@...wei.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7] hisi_sas: Misc bugfixes and an optimisation patch

On Wed, Oct 10, 2018 at 09:58:25PM -0400, Martin K. Petersen wrote:
> > This is because the IPTT index must be a unique value per HBA. However,
> > if we switched to SCSI MQ, the block layer tag becomes unique per queue,
> > and not per HBA.
> 
> That doesn't sound right.

blk-mq tags are always per-host (which has actually caused problems for
ATA, which is now using its own per-device tags).