From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: SCSI regression in 4.11
Date: Wed, 1 Mar 2017 15:39:30 -0800
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References: <20170227152955.1362aabb@xeon-e3>
        <20170227171931.30b9f619@xeon-e3>
        <20170228140812.GC20197@lst.de>
        <c1949de0-8b95-e254-1bec-bcdae762890f@kernel.dk>
        <1488301573.3046.9.camel@linux.vnet.ibm.com>
        <20170228105741.6253bb8a@xeon-e3>
        <1488325732.11610.9.camel@linux.vnet.ibm.com>
        <20170228172532.280811ed@xeon-e3>
        <1488349258.20321.11.camel@linux.vnet.ibm.com>
        <20170301104800.00322bd4@xeon-e3>
        <1488394620.2183.20.camel@linux.vnet.ibm.com>
        <1488396022.2183.26.camel@HansenPartnership.com>
        <20170301132741.7aa3eb96@xeon-e3>
        <1488409784.2183.48.camel@HansenPartnership.com>
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To: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Jens Axboe <axboe@kernel.dk>, Christoph Hellwig <hch@lst.de>, Linus Torvalds <torvalds@linux-foundation.org>, "Martin K. Petersen" <martin.petersen@oracle.com>, "K. Y. Srinivasan" <kys@microsoft.com>, Dexuan Cui <decui@microsoft.com>, Long Li <longli@microsoft.com>, Josh Poulson <jopoulso@microsoft.com>, v-adsuho@microsoft.com, linux-scsi@vger.kernel.org, Haiyang Zhang <haiyangz@microsoft.com>

On Wed, 01 Mar 2017 15:09:44 -0800
James Bottomley <James.Bottomley@HansenPartnership.com> wrote:

> On Wed, 2017-03-01 at 13:27 -0800, Stephen Hemminger wrote:
> > Ok here is much better data, wasn't accounting for the offset in the
> > payload  
> 
> But now both responses are the same:
> 
> > Working 4.10  
> [...]
> > [    1.048920] hv_storvsc: INQUIRY cmd 0x12 0x0 0x0 scsi status 0x0
> > srb status 0x20 length 36
> > [    1.048920] hv_storvsc:  payload size 288 count 1 offset 1024 len
> > 36 pfn 0x1f15d7
> > [    1.048921] hv_storvsc:  sg 0: phys 0x1f15d7000 virt
> > ffff9270b15d7000 offset 0x400 length 36
> > [    1.048922] data: 00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00
> > 00 00 00  ................
> > [    1.048923] data: 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00
> > 00 00 00  ................
> > [    1.048923] data: 00000020: 00 00 00 00                           
> >            ....
> > [    1.048942] scsi host1: scsi scan: INQUIRY result too short (5),
> > using 36
> > 
> > 
> > Broken 4.11  
> [...]
> > [    1.812926] hv_storvsc: INQUIRY cmd 0x12 0x0 0x0 scsi status 0x0
> > srb status 0x20 length 36
> > [    1.812927] hv_storvsc:  payload size 288 count 1 offset 2816 len
> > 36 pfn 0x1f198b
> > [    1.812928] hv_storvsc:  sg 0: phys 0x1f198b000 virt
> > ffff9a42f198b000 offset 0xb00 length 36
> > [    1.812953] data: 00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00
> > 00 00 00  ................
> > [    1.812953] data: 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00
> > 00 00 00  ................
> > [    1.812954] data: 00000020: 00 00 00 00                           
> >            ....
> > [    1.813258] scsi host1: scsi scan: INQUIRY result too short (5),
> > using 36  
> 
> Hyper-v is returning a buffer of zeros for INQUIRY to the offline
> device in both cases ... that means the problem isn't where I thought
> it was.
> 
> James

Yes. Earlier output wasn't accounting for offsets, new dump code is.