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SubjectRe: [PATCH v2] block: ratelimite pr_err on IO path
On Fri, Apr 13, 2018 at 6:59 PM, Martin K. Petersen
<martin.petersen@oracle.com> wrote:
>
> Jinpu,
>
> [CC:ed the mpt3sas maintainers]
>
> The ratelimit patch is just an attempt to treat the symptom, not the
> cause.
Agree. If we can fix the root cause, it will be great.
>
>> Thanks for asking, we updated mpt3sas driver which enables DIX support
>> (prot_mask=0x7f), all disks are SATA SSDs, no DIF support.
>> After reboot, kernel reports the IO errors from all the drives behind
>> HBA, seems for almost every read IO, which turns the system unusable:
>> [ 13.079375] sda: ref tag error at location 0 (rcvd 143196159)
>> [ 13.079989] sda: ref tag error at location 937702912 (rcvd 143196159)
>> [ 13.080233] sda: ref tag error at location 937703072 (rcvd 143196159)
>> [ 13.080407] sda: ref tag error at location 0 (rcvd 143196159)
>> [ 13.080594] sda: ref tag error at location 8 (rcvd 143196159)
>
> That sounds like a bug in the mpt3sas driver or firmware. I guess the
> HBA could conceivably be operating a SATA device as DIX Type 0 and strip
> the PI on the drive side. But that doesn't seem to be a particularly
> useful mode of operation.
>
> Jinpu: Which firmware are you running? Also, please send us the output
> of:
>
> sg_readcap -l /dev/sda
> sg_inq -x /dev/sda
> sg_vpd /dev/sda
>
Disks are INTEL SSDSC2BX48, directly attached to HBA.
LSISAS3008: FWVersion(13.00.00.00), ChipRevision(0x02), BiosVersion(08.11.00.00)
mpt3sas_cm2: Protocol=(Initiator,Target),
Capabilities=(TLR,EEDP,Snapshot Buffer,Diag Trace Buffer,Task Set
Full,NCQ)

jwang@x:~$ sudo sg_vpd /dev/sdz
Supported VPD pages VPD page:
Supported VPD pages [sv]
Unit serial number [sn]
Device identification [di]
Mode page policy [mpp]
ATA information (SAT) [ai]
Block limits (SBC) [bl]
Block device characteristics (SBC) [bdc]
Logical block provisioning (SBC) [lbpv]
jwang@x:~$ sudo sg_inq -x /dev/sdz
VPD INQUIRY: extended INQUIRY data page
inquiry: field in cdb illegal (page not supported)
jwang@x:~$ sudo sg_readcap -l /dev/sdz
Read Capacity results:
Protection: prot_en=0, p_type=0, p_i_exponent=0
Logical block provisioning: lbpme=1, lbprz=1
Last logical block address=937703087 (0x37e436af), Number of
logical blocks=937703088
Logical block length=512 bytes
Logical blocks per physical block exponent=3 [so physical block
length=4096 bytes]
Lowest aligned logical block address=0
Hence:
Device size: 480103981056 bytes, 457862.8 MiB, 480.10 GB


> Broadcom: How is DIX supposed to work for SATA drives behind an mpt3sas
> controller?
>
> --
> Martin K. Petersen Oracle Linux Engineering


Thanks!

--
Jack Wang
Linux Kernel Developer

ProfitBricks GmbH
Greifswalder Str. 207
D - 10405 Berlin

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