* [PATCH 1/3] sd_try_extended_inquiry for SPC-3 targets
@ 2013-05-21 13:40 Ilan Steinberg
2013-05-21 19:33 ` Martin K. Petersen
0 siblings, 1 reply; 4+ messages in thread
From: Ilan Steinberg @ 2013-05-21 13:40 UTC (permalink / raw)
To: linux-scsi
Hello,
I am new to this forum, I tried to look up this question, but could not find
any reference.
I have some trouble in with the 0xb1 VPD inquiry.
I set my device as a non-rotational device by returning 0x0001 in bytes 4-5
(MEDIUM ROTATION RATE) just as the SBC-3 demands:
"0001h Non-rotating medium (e.g., solid state)"
However, in the sysfs I see that the device is set as rotational device. I
went into the kernel code to see why this happens. I found that the 0xb1
inquiry is only called if sd_try_extended_inquiry(sdp) returns a scsi
version higher then SCSI_SPC_2. There is even a comment:
"
static int sd_try_extended_inquiry(struct scsi_device *sdp)
{
/*
* Although VPD inquiries can go to SCSI-2 type devices,
* some USB ones crash on receiving them, and the pages
* we currently ask for are for SPC-3 and beyond
*/
if (sdp->scsi_level > SCSI_SPC_2)
return 1;
return 0;
}
"
my device supports SPC-3.
The scsi_level of my device (as I expose it in the page0 inquiry) is 0x5
according to SPC4 this means SPC-3.
This is from SPC4-revision 24 (3-6 are the same in revision 36e which is the
latest I have):
"
00h The device does not claim conformance to any standard.
02h Obsolete
03h The device complies to ANSI INCITS 301-1997 (a withdrawn standard).
04h The device complies to ANSI INCITS 351-2001 (SPC-2).
05h The device complies to ANSI INCITS 408-2005 (SPC-3).
06h The device complies to this standard.
"
So it should pass the sd_try_extended_inquiry(spd).
The problem is that SCSI_SPC_2 is defined as 5 in include/scsi/scsi.h:484
(below). This causes SPC-3 devices not to be queried. and thus, they are set
as rotational devices in the sysfs.
/*
* struct scsi_device::scsi_level values. For SCSI devices other than those
* prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
* where "resp" is a byte array of the response to an INQUIRY. The
scsi_level
* variable is visible to the user via sysfs.
*/
#define SCSI_UNKNOWN 0
#define SCSI_1 1
#define SCSI_1_CCS 2
#define SCSI_2 3
#define SCSI_3 4 /* SPC */
#define SCSI_SPC_2 5
#define SCSI_SPC_3 6
If you read the comment it seams to me that the test (sdp->scsi_level >
SCSI_SPC_2) is incorrect.
I looked at the native linux target, and it uses the scsi.h definitions, so
it passes the test properly. For non native targets, this is a problem. Is
this done by design (I can see that this code has been in the SCSI layer
since the initial git)?
Thank you,
Ilan Steinberg
--
View this message in context: http://old.nabble.com/sd_try_extended_inquiry-for-SPC-3-targets-tp35421216p35421216.html
Sent from the linux-scsi mailing list archive at Nabble.com.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH 1/3] sd_try_extended_inquiry for SPC-3 targets
2013-05-21 13:40 [PATCH 1/3] sd_try_extended_inquiry for SPC-3 targets Ilan Steinberg
@ 2013-05-21 19:33 ` Martin K. Petersen
0 siblings, 0 replies; 4+ messages in thread
From: Martin K. Petersen @ 2013-05-21 19:33 UTC (permalink / raw)
To: Ilan Steinberg; +Cc: linux-scsi
>>>>> "Ilan" == Ilan Steinberg <ilan.steinberg@kaminario.com> writes:
Ilan> If you read the comment it seams to me that the test
Ilan> (sdp->scsi_level > SCSI_SPC_2) is incorrect.
scsi_device->scsi_level is not in sync with SPC-n. We set scsi_level
to match the offset Linux constants at device discovery time.
Did you remember to include the Block Device Characteristics VPD page in
your page 0?
--
Martin K. Petersen Oracle Linux Engineering
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH 1/3] sd_try_extended_inquiry for SPC-3 targets
@ 2013-05-21 13:40 Ilan Steinberg
0 siblings, 0 replies; 4+ messages in thread
From: Ilan Steinberg @ 2013-05-21 13:40 UTC (permalink / raw)
To: linux-scsi
Hello,
I am new to this forum, I tried to look up this question, but could not find
any reference.
I have some trouble in with the 0xb1 VPD inquiry.
I set my device as a non-rotational device by returning 0x0001 in bytes 4-5
(MEDIUM ROTATION RATE) just as the SBC-3 demands:
"0001h Non-rotating medium (e.g., solid state)"
However, in the sysfs I see that the device is set as rotational device. I
went into the kernel code to see why this happens. I found that the 0xb1
inquiry is only called if sd_try_extended_inquiry(sdp) returns a scsi
version higher then SCSI_SPC_2. There is even a comment:
"
static int sd_try_extended_inquiry(struct scsi_device *sdp)
{
/*
* Although VPD inquiries can go to SCSI-2 type devices,
* some USB ones crash on receiving them, and the pages
* we currently ask for are for SPC-3 and beyond
*/
if (sdp->scsi_level > SCSI_SPC_2)
return 1;
return 0;
}
"
my device supports SPC-3.
The scsi_level of my device (as I expose it in the page0 inquiry) is 0x5
according to SPC4 this means SPC-3.
This is from SPC4-revision 24 (3-6 are the same in revision 36e which is the
latest I have):
"
00h The device does not claim conformance to any standard.
02h Obsolete
03h The device complies to ANSI INCITS 301-1997 (a withdrawn standard).
04h The device complies to ANSI INCITS 351-2001 (SPC-2).
05h The device complies to ANSI INCITS 408-2005 (SPC-3).
06h The device complies to this standard.
"
So it should pass the sd_try_extended_inquiry(spd).
The problem is that SCSI_SPC_2 is defined as 5 in include/scsi/scsi.h:484
(below). This causes SPC-3 devices not to be queried. and thus, they are set
as rotational devices in the sysfs.
/*
* struct scsi_device::scsi_level values. For SCSI devices other than those
* prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
* where "resp" is a byte array of the response to an INQUIRY. The
scsi_level
* variable is visible to the user via sysfs.
*/
#define SCSI_UNKNOWN 0
#define SCSI_1 1
#define SCSI_1_CCS 2
#define SCSI_2 3
#define SCSI_3 4 /* SPC */
#define SCSI_SPC_2 5
#define SCSI_SPC_3 6
If you read the comment it seams to me that the test (sdp->scsi_level >
SCSI_SPC_2) is incorrect.
I looked at the native linux target, and it uses the scsi.h definitions, so
it passes the test properly. For non native targets, this is a problem. Is
this done by design (I can see that this code has been in the SCSI layer
since the initial git)?
Thank you,
Ilan Steinberg
--
View this message in context: http://old.nabble.com/sd_try_extended_inquiry-for-SPC-3-targets-tp35421213p35421213.html
Sent from the linux-scsi mailing list archive at Nabble.com.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH 1/3] sd_try_extended_inquiry for SPC-3 targets
@ 2013-05-21 13:39 Ilan Steinberg
0 siblings, 0 replies; 4+ messages in thread
From: Ilan Steinberg @ 2013-05-21 13:39 UTC (permalink / raw)
To: linux-scsi
Hello,
I am new to this forum, I tried to look up this question, but could not find
any reference.
I have some trouble in with the 0xb1 VPD inquiry.
I set my device as a non-rotational device by returning 0x0001 in bytes 4-5
(MEDIUM ROTATION RATE) just as the SBC-3 demands:
"0001h Non-rotating medium (e.g., solid state)"
However, in the sysfs I see that the device is set as rotational device. I
went into the kernel code to see why this happens. I found that the 0xb1
inquiry is only called if sd_try_extended_inquiry(sdp) returns a scsi
version higher then SCSI_SPC_2. There is even a comment:
"
static int sd_try_extended_inquiry(struct scsi_device *sdp)
{
/*
* Although VPD inquiries can go to SCSI-2 type devices,
* some USB ones crash on receiving them, and the pages
* we currently ask for are for SPC-3 and beyond
*/
if (sdp->scsi_level > SCSI_SPC_2)
return 1;
return 0;
}
"
my device supports SPC-3.
The scsi_level of my device (as I expose it in the page0 inquiry) is 0x5
according to SPC4 this means SPC-3.
This is from SPC4-revision 24 (3-6 are the same in revision 36e which is the
latest I have):
"
00h The device does not claim conformance to any standard.
02h Obsolete
03h The device complies to ANSI INCITS 301-1997 (a withdrawn standard).
04h The device complies to ANSI INCITS 351-2001 (SPC-2).
05h The device complies to ANSI INCITS 408-2005 (SPC-3).
06h The device complies to this standard.
"
So it should pass the sd_try_extended_inquiry(spd).
The problem is that SCSI_SPC_2 is defined as 5 in include/scsi/scsi.h:484
(below). This causes SPC-3 devices not to be queried. and thus, they are set
as rotational devices in the sysfs.
/*
* struct scsi_device::scsi_level values. For SCSI devices other than those
* prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
* where "resp" is a byte array of the response to an INQUIRY. The
scsi_level
* variable is visible to the user via sysfs.
*/
#define SCSI_UNKNOWN 0
#define SCSI_1 1
#define SCSI_1_CCS 2
#define SCSI_2 3
#define SCSI_3 4 /* SPC */
#define SCSI_SPC_2 5
#define SCSI_SPC_3 6
If you read the comment it seams to me that the test (sdp->scsi_level >
SCSI_SPC_2) is incorrect.
I looked at the native linux target, and it uses the scsi.h definitions, so
it passes the test properly. For non native targets, this is a problem. Is
this done by design (I can see that this code has been in the SCSI layer
since the initial git)?
Thank you,
Ilan Steinberg
--
View this message in context: http://old.nabble.com/sd_try_extended_inquiry-for-SPC-3-targets-tp35421210p35421210.html
Sent from the linux-scsi mailing list archive at Nabble.com.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2013-05-21 19:33 UTC | newest]
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2013-05-21 13:40 [PATCH 1/3] sd_try_extended_inquiry for SPC-3 targets Ilan Steinberg
2013-05-21 19:33 ` Martin K. Petersen
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2013-05-21 13:40 Ilan Steinberg
2013-05-21 13:39 Ilan Steinberg
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