RE: Driver version for PMC Adaptec HBA in Linux and from vendor

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Hi Paul,

> -----Original Message-----
> From: Paul Menzel [mailto:pmenzel@xxxxxxxxxxxxx]
> Sent: Tuesday, December 19, 2017 3:12 PM
> To: Raghava Aditya Renukunta
> <RaghavaAditya.Renukunta@xxxxxxxxxxxxx>; dl-esc-Aacraid Linux Driver
> <aacraid@xxxxxxxxxxxxx>
> Cc: linux-scsi@xxxxxxxxxxxxxxx; it+linux-scsi@xxxxxxxxxxxxx
> Subject: Re: Driver version for PMC Adaptec HBA in Linux and from vendor
> 
> EXTERNAL EMAIL
> 
> 
> Dear Raghava Aditya,
> 
> 
> Thank you for your answer.
> 
> Am 18.12.2017 um 19:09 schrieb Raghava Aditya Renukunta:
> 
> >> -----Original Message-----
> >> From: Paul Menzel [mailto:pmenzel@xxxxxxxxxxxxx]
> >> Sent: Saturday, December 16, 2017 1:39 AM
> >> To: Raghava Aditya Renukunta
> >> <RaghavaAditya.Renukunta@xxxxxxxxxxxxx>; dl-esc-Aacraid Linux Driver
> >> <aacraid@xxxxxxxxxxxxx>
> >> Cc: linux-scsi@xxxxxxxxxxxxxxx; it+linux-scsi@xxxxxxxxxxxxxxx
> >> Subject: Re: Driver version for PMC Adaptec HBA in Linux and from
> vendor
> 
> >> Am 17.02.2017 um 20:29 schrieb Raghava Aditya Renukunta:
> >>
> >>>> Using a PMC Adaptec HBA 1000-8e with latest Linux, it only initializes
> >>>> in sync mode, instead of async mode.
> >>>
> >>> The patches that enable async mode in HBA 1000-8e, have been
> included in
> >> the James Bottomley's linux-scsi Branch and are on track be
> >>> Included into Linux 4.11.
> >>>
> >>> https://git.kernel.org/cgit/linux/kernel/git/jejb/scsi.git/
> >>>
> >>>> ```
> >>>> $ git describe --tag
> >>>> v4.10-rc8-47-g0722f57bf
> >>>> $ dmesg
> >>>> [   21.359635] Adaptec aacraid driver 1.2-1[41066]-ms
> >>>> [   21.360017] aacraid 0000:04:00.0: can't disable ASPM; OS doesn't have
> >>>> ASPM control
> >>>> [   21.363987] AAC0: Async. mode not supported by current driver, sync.
> >>>> mode enforced.
> >>>> [   21.363987] Please update driver to get full performance.
> >>>> [   21.364949] AAC0: kernel 1.2-0[0] Nov  5 2015
> >>>> [   21.365275] AAC0: monitor 0.0-0[0]
> >>>> [   21.371382] AAC0: bios 0.13-209[32000]
> >>>> [   21.371711] AAC0: serial 10F447
> >>>> [   21.372035] AAC0: Non-DASD support enabled.
> >>>> [   21.372360] AAC0: 64bit support enabled.
> >>>> [   21.372688] AAC0: 64 Bit DAC enabled
> >>>> […]
> >>>> $ git grep 'AAC_DRIVER_BUILD 41066'
> >>>> drivers/scsi/aacraid/aacraid.h:# define AAC_DRIVER_BUILD 41066
> >>>> ```
> >>>>
> >>>> Searching the vendor Web site, there is *Linux Driver Source
> >>>> 1.2.1-53005* available for download [1].
> >>>
> >>> The latest upstream driver version is 50740. We will be reaching version
> 53005 in couple of patch sets  ( ~ 3).
> >>>
> >>
> http://git.kernel.org/cgit/linux/kernel/git/jejb/scsi.git/commit/?id=96f6a613
> >> 4766de0d42a98c7758736dde16e0add5
> >>
> >> Thank you for the details. At our infrastructure we only want to use LTS
> >> Linux kernels, and the latest in 4.14. So right now, Linux 4.14.6
> >> includes version 50834 [1], which is the same version currently in Linus
> >> master branch (4.15-rc3). Is that save to use with async mode, or are
> >> you aware of problems and we should always use the latest out of tree
> >> driver, which is at version 55022 and can be download from the Microsemi
> >> server [3].
> >
> > Well at this point I am in the process of creating a patch set that solves a
> kdump regression issue(Should be out before the new year), other than that
> the upstream driver is pretty much up to date. If kdump support is a must
> for you I would recommend that  55022 be used.
> 
>  From your answer the state of async support is unclear to me. Could you
> please clarify, if that’s support in 4.14.x? (What source line do I need
> to check?)

It is supported in 4.14, there is no single line specifically, but if the variable sa_firmware is set
then async mode is enabled.

> >>>> How does the upstream process work? Is there a git repository
> somewhere
> >>>> from Microsemi? Are the patches already up for review? (I didn’t find
> them.)
> >>>
> >>> We try to push out patch sets to kernel.org for every major  driver
> release we make.  Usually they go into the
> >>> sub component maintainers branch (linux-scsi ) , which is then pushed
> out to Linus when the merge
> >>> window for  opens (currently the merge window for 4.10 is closed ,
> barring fixes). So Linux version 4.11 should have
> >>> full async support and more for HBA1000-8e.
> >>>
> >>> We do not maintain a git repository unfortunately, but we do release the
> >>> source code for every release as you indicated.
> >>>
> >>> For further reference the patches are sent out in the scsi mailing list
> linux-scsi@xxxxxxxxxxxxxxx ,
> >>> the archive is here http://marc.info/?l=linux-scsi&r=1&w=2 .
> >>>
> >>> Hope I cleared up your doubts. Please do reach out if you have other
> concerns or questions.
> >>
> >> Yes, thank you for your elaborate answer, which cleared up a lot of my
> >> doubts. We would be even more satisfied if you moved your
> development
> >> fully to the Linux kernel tree, so that it always carries the latest
> >> driver. If we can help with that by contacting certain people, please
> >> tell us.
> >
> > We would love to, but  we have lots of customers who are on the older
> kernel versions 2.6.32, 3.10.0 etc and It becomes almost impossible for us to
> fully move our development to the  Linux kernel tree and support our
> customers at the same time.  Hopefully we will start being up to date with
> the upstream kernel in the coming months. Hope that answered your
> questions.
> 
> I understand, but doesn’t it make more sense to adapt the model like
> done for Linux Long Term Support (LTS) series to develop against the
> latest Linux kernel, and then backport the corresponding patches?
> 
> Maybe you should talk to Red Hat and SUSE? I guess that’s the systems
> you have to support. Probably you already talk to them.

That is a good thought, I can funnel back your feedback to my Team and Management. I certainly think there is value in it.

Regards,
Raghava Aditya
 
> Kind regards,
> 
> Paul
> 
> 
> >>>> [1] https://storage.microsemi.com/en-
> us/speed/raid/aac/linux/aacraid-linux-src-1_2_1-53005_tgz.php
> >> [2] https://elixir.free-
> electrons.com/linux/v4.14.6/source/drivers/scsi/aacraid/aacraid.h#L100
> >> [3] https://storage.microsemi.com/en-
> us/downloads/linux_source/linux_source_code/productid=aha-1000-
> 8e&dn=microsemi+adaptec+hba+1000-8e.php




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