snip
> This code seems incorrect to me for the SRP protocol. In the SRP
> protocol, although there is no TCQ support, queue depths above one are
> supported.
>
> I also have a more general remark. There is no TCQ support in the SRP
> protocol, which means that sdev->tagged_supported is always 0 (false).
> So my recommendation is to leave out all code that depends on "if
> (sdev->tagged_supported)" and to remove the "if
> (!sdev->tagged_supported)" tests.
>
> Bart.
Hello Bart,
I look into scsi core about above statement:
In drivers/scsi/scsi_scan.c:865:
if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
!(*bflags & BLIST_NOTQ))
sdev->tagged_supported = 1;
It check inquiry result byte 7 with cmdque bit.
inquiry result of a disk export through srp/srpt
sg_inq /dev/sdb
standard INQUIRY:
PQual=0 Device_type=0 RMB=0 version=0x06 [SPC-4]
[AERC=0] [TrmTsk=0] NormACA=0 HiSUP=0 Resp_data_format=2
SCCS=0 ACC=0 TPGS=0 3PC=0 Protect=0 [BQue=0]
EncServ=0 MultiP=1 (VS=0) [MChngr=0] [ACKREQQ=0] Addr16=0
[RelAdr=0] WBus16=0 Sync=0 Linked=0 [TranDis=0] CmdQue=1
[SPI: Clocking=0x0 QAS=0 IUS=0]
length=66 (0x42) Peripheral device type: disk
Vendor identification: SCST_FIO
Product identification: vol0
Product revision level: 300
Unit serial number: 609bbc13
So the sdev_>tagged_supported will be set in this case
In srpr16 p38
The TASK ATTRIBUTE field is defined in table 21, it includes support for:
head of queue
ordered
simple
Do I miss something?
Regards,
Jack
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