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Re: [PATCH 0/15] copy offload patches

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  Re: [PATCH 0/15] copy offload patches Mikulas Patocka <mpatocka@redhat.com> - 2015-12-15 02:30 +0100
    Re: [PATCH 0/15] copy offload patches Douglas Gilbert <dgilbert@interlog.com> - 2015-12-15 04:50 +0100
    Re: [PATCH 0/15] copy offload patches "Martin K. Petersen" <martin.petersen@oracle.com> - 2015-12-16 04:10 +0100

#1291755 — Re: [PATCH 0/15] copy offload patches

On Thu, 10 Dec 2015, Martin K. Petersen wrote:

> >>>>> "Mikulas" == Mikulas Patocka <mpatocka@redhat.com> writes:
> 
> Mikulas,
> 
> Mikulas> This patch series adds copy offload (the XCOPY command) to the
> Mikulas> block layer, SCSI subsystems and device mapper.
> 
> Now that the VFS stuff appears to stabilize I agree it's a good time to
> revisit all this. I just merged the required VPD patches from Hannes so
> those will be in 4.5.
> 
> I have a bunch of changes to the SCSI code that I worked on over the
> spring/summer based on a feedback from the array vendors after
> discussions we started at LSF/MM. Generally speaking, their comments
> didn't make things easier, nor prettier :( But your two bio approach is
> a requirement to accommodate those needs (token-based copy) so I'll work
> on consolidating your changes with mine.

Let me know when you make some progress with that.

Is there some software iSCSI implementation that supports token-based 
copy? So that I could try to make support for it.

Mikulas

> That said, we still need Mike Christie's patches to go in first.
> 
> Mike: What's your status? I'm afraid I didn't get a chance to dig very
> deep in your series since it coincided with me scrambling to sort out
> SCSI for 4.4. Do you think there's a chance we could get your patches in
> shape for 4.5? Is there an up-to-date tree I can look at?
> 
> -- 
> Martin K. Petersen	Oracle Linux Engineering

Mikulas
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#1291827

On 15-12-14 08:22 PM, Mikulas Patocka wrote:
>
>
> On Thu, 10 Dec 2015, Martin K. Petersen wrote:
>
>>>>>>> "Mikulas" == Mikulas Patocka <mpatocka@redhat.com> writes:
>>
>> Mikulas,
>>
>> Mikulas> This patch series adds copy offload (the XCOPY command) to the
>> Mikulas> block layer, SCSI subsystems and device mapper.
>>
>> Now that the VFS stuff appears to stabilize I agree it's a good time to
>> revisit all this. I just merged the required VPD patches from Hannes so
>> those will be in 4.5.
>>
>> I have a bunch of changes to the SCSI code that I worked on over the
>> spring/summer based on a feedback from the array vendors after
>> discussions we started at LSF/MM. Generally speaking, their comments
>> didn't make things easier, nor prettier :( But your two bio approach is
>> a requirement to accommodate those needs (token-based copy) so I'll work
>> on consolidating your changes with mine.
>
> Let me know when you make some progress with that.
>
> Is there some software iSCSI implementation that supports token-based
> copy? So that I could try to make support for it.

FreeNAS. See:
    http://www.freenas.org/

It has the best ODX implementation (thanks to Alexander Motin) that
I have come across for testing my ddpt based ODX client. It also
supports large parts of the more general xcopy LID1 and LID4.


BTW In SPC-5 xcopy LID1 has been dropped and "xcopy" now means
xcopy LID4 (as found in SPC-4).

Doug Gilbert

>> That said, we still need Mike Christie's patches to go in first.
>>
>> Mike: What's your status? I'm afraid I didn't get a chance to dig very
>> deep in your series since it coincided with me scrambling to sort out
>> SCSI for 4.4. Do you think there's a chance we could get your patches in
>> shape for 4.5? Is there an up-to-date tree I can look at?
>>
>> --
>> Martin K. Petersen	Oracle Linux Engineering


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#1292714

>>>>> "Mikulas" == Mikulas Patocka <mpatocka@redhat.com> writes:

Mikulas> Is there some software iSCSI implementation that supports
Mikulas> token-based copy? So that I could try to make support for it.

I did write support for token-based copy but it's in a different branch
from the xcopy stuff. I will have to reconcile those two branches and
then layer your stuff on top.

-- 
Martin K. Petersen	Oracle Linux Engineering
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