linux-kernel - Re: [RFC/RFT PATCH] scsi: pm8001: Expose HW queues for pm80xx hw

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Date:   Tue, 16 Feb 2021 19:15:44 +0100
From:   Hannes Reinecke <hare@...e.de>
To:     Viswas.G@...rochip.com, john.garry@...wei.com, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, akshatzen@...gle.com,
        Ruksar.devadi@...rochip.com, radha@...gle.com,
        bjashnani@...gle.com, vishakhavc@...gle.com,
        jinpu.wang@...ud.ionos.com, Ashokkumar.N@...rochip.com
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        kashyap.desai@...adcom.com, ming.lei@...hat.com
Subject: Re: [RFC/RFT PATCH] scsi: pm8001: Expose HW queues for pm80xx hw

On 2/15/21 6:31 PM, Viswas.G@...rochip.com wrote:
> Hi John,
> 
> We could test this patch and it works fine. Regarding the usage of request->tag, We have some challenges there.
> Pm80xx driver need tag for internal command as well. Tag is controller wide and we need to assign unique tag
> for internal command as well. If we use request->tag, how can we get tag for internal commands ? If driver
> allocate that, how can we make sure it will not conflict with the request->tag ?
> 
I have posted a patchset for internal tags some time ago; at the time it 
was blocked by the missing shared tagset functionality.
But seeing that we're having it now I guess I'll need to repost; that 
addresses precisely the issue you've described.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
hare@...e.de                              +49 911 74053 688
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