[PATCH] nvme: Namepace identification descriptor list is optional

[PATCH] nvme: Namepace identification descriptor list is optional

[Keith Busch]

Despite NVM Express specification 1.3 requires a controller claiming to
be 1.3 or higher implement Identify CNS 03h (Namespace Identification
Descriptor list), the driver doesn't really need this identification in
order to use a namespace. The code had already documented in comments
that we're not to consider an error to this command.

Return success if the controller provided any response to an
namespace identification descriptors command.

Fixes: 538af88ea7d9de24 ("nvme: make nvme_report_ns_ids propagate error back")
Reported-by: Ingo Brunberg <ingo_brunberg@web.de>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: stable@vger.kernel.org # 5.4+
Signed-off-by: Keith Busch <kbusch@kernel.org>
---
 drivers/nvme/host/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index e6ee34376c5e..2a84e1402244 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1735,6 +1735,8 @@ static int nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid,
 		if (ret)
 			dev_warn(ctrl->device,
 				 "Identify Descriptors failed (%d)\n", ret);
+		if (ret > 0)
+			ret = 0;
 	}
 	return ret;
 }
-- 
2.21.0


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Re: [PATCH] nvme: Namepace identification descriptor list is optional

[Christoph Hellwig]

On Tue, Dec 03, 2019 at 12:56:11AM +0900, Keith Busch wrote:
> Despite NVM Express specification 1.3 requires a controller claiming to
> be 1.3 or higher implement Identify CNS 03h (Namespace Identification
> Descriptor list), the driver doesn't really need this identification in
> order to use a namespace. The code had already documented in comments
> that we're not to consider an error to this command.
> 
> Return success if the controller provided any response to an
> namespace identification descriptors command.
> 
> Fixes: 538af88ea7d9de24 ("nvme: make nvme_report_ns_ids propagate error back")
> Reported-by: Ingo Brunberg <ingo_brunberg@web.de>

Why would we ignore the error?  Do you have a buggy controller messing
this up?

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Re: [PATCH] nvme: Namepace identification descriptor list is optional

[Keith Busch]

On Mon, Dec 02, 2019 at 05:15:45PM +0100, Christoph Hellwig wrote:
> On Tue, Dec 03, 2019 at 12:56:11AM +0900, Keith Busch wrote:
> > Despite NVM Express specification 1.3 requires a controller claiming to
> > be 1.3 or higher implement Identify CNS 03h (Namespace Identification
> > Descriptor list), the driver doesn't really need this identification in
> > order to use a namespace. The code had already documented in comments
> > that we're not to consider an error to this command.
> > 
> > Return success if the controller provided any response to an
> > namespace identification descriptors command.
> > 
> > Fixes: 538af88ea7d9de24 ("nvme: make nvme_report_ns_ids propagate error back")
> > Reported-by: Ingo Brunberg <ingo_brunberg@web.de>
> 
> Why would we ignore the error?  Do you have a buggy controller messing
> this up?

I don't have such a controller, but many apparently do. The regression
was reported here:

http://lists.infradead.org/pipermail/linux-nvme/2019-December/028223.html

And of course it's the SMI controller ...

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Re: [PATCH] nvme: Namepace identification descriptor list is optional

[Nadolski, Edmund]

On 12/2/2019 9:22 AM, Keith Busch wrote:
> On Mon, Dec 02, 2019 at 05:15:45PM +0100, Christoph Hellwig wrote:
>> On Tue, Dec 03, 2019 at 12:56:11AM +0900, Keith Busch wrote:
>> > Despite NVM Express specification 1.3 requires a controller claiming to
>> > be 1.3 or higher implement Identify CNS 03h (Namespace Identification
>> > Descriptor list), the driver doesn't really need this identification in
>> > order to use a namespace. The code had already documented in comments
>> > that we're not to consider an error to this command.
>> > 
>> > Return success if the controller provided any response to an
>> > namespace identification descriptors command.
>> > 
>> > Fixes: 538af88ea7d9de24 ("nvme: make nvme_report_ns_ids propagate error back")
>> > Reported-by: Ingo Brunberg <ingo_brunberg@web.de>
>> 
>> Why would we ignore the error?  Do you have a buggy controller messing
>> this up?
> 
> I don't have such a controller, but many apparently do. The regression
> was reported here:
> 
> http://lists.infradead.org/pipermail/linux-nvme/2019-December/028223.html
> 
> And of course it's the SMI controller ...

Does 5.4 show the exact error code?  Perhaps we should selectively allow just 
for that case?

Ed


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Re: [PATCH] nvme: Namepace identification descriptor list is optional

[Christoph Hellwig]

On Mon, Dec 02, 2019 at 09:27:14AM -0700, Nadolski, Edmund wrote:
>> I don't have such a controller, but many apparently do. The regression
>> was reported here:
>>
>> http://lists.infradead.org/pipermail/linux-nvme/2019-December/028223.html
>>
>> And of course it's the SMI controller ...
>
> Does 5.4 show the exact error code?  Perhaps we should selectively allow 
> just for that case?

They'll find other ways to f***ck up.  Looks like at least the controller
in the bug report also doesn't have an subnqn and the nguid/eui64 are
bogus.  I wonder if we actually do users a favour by allowing that..

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Re: [PATCH] nvme: Namepace identification descriptor list is optional

[Nadolski, Edmund]

On 12/2/2019 9:29 AM, Christoph Hellwig wrote:
> On Mon, Dec 02, 2019 at 09:27:14AM -0700, Nadolski, Edmund wrote:
>>> I don't have such a controller, but many apparently do. The regression
>>> was reported here:
>>>
>>> http://lists.infradead.org/pipermail/linux-nvme/2019-December/028223.html
>>>
>>> And of course it's the SMI controller ...
>>
>> Does 5.4 show the exact error code?  Perhaps we should selectively allow 
>> just for that case?
> 
> They'll find other ways to f***ck up.  Looks like at least the controller
> in the bug report also doesn't have an subnqn and the nguid/eui64 are
> bogus.  I wonder if we actually do users a favour by allowing that..

Agreed, tho since it looks like a regression, does it make sense to treat as a 
quirk?

Ed


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Re: [PATCH] nvme: Namepace identification descriptor list is optional

[Keith Busch]

On Mon, Dec 02, 2019 at 05:29:05PM +0100, Christoph Hellwig wrote:
> On Mon, Dec 02, 2019 at 09:27:14AM -0700, Nadolski, Edmund wrote:
> >> I don't have such a controller, but many apparently do. The regression
> >> was reported here:
> >>
> >> http://lists.infradead.org/pipermail/linux-nvme/2019-December/028223.html
> >>
> >> And of course it's the SMI controller ...
> >
> > Does 5.4 show the exact error code?  Perhaps we should selectively allow 
> > just for that case?
> 
> They'll find other ways to f***ck up.  Looks like at least the controller
> in the bug report also doesn't have an subnqn and the nguid/eui64 are
> bogus.

Indeed, they will find creative ways to break it.

Customer or OEM requirments are poorly written, like "Must report NVMe
version 1.3". Nobody bothers to mention that it must also be compliant
to that version, or even realize they never cared for those features in
the first place.

Compliance testing like from UNH should have caught this before shipping
with such a device, but it's a cheap device, so maybe they skip that step.

>  I wonder if we actually do users a favour by allowing that..

I think it's too late now. We did successfully use such namespaces
before 5.4, even if they're fundamentally broken.

Johannes also commented *not* to consider these errors when this
identification was originally implemented, so either he knew vendors
screwed this up, or had the forethought to know they would.

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Re: [PATCH] nvme: Namepace identification descriptor list is optional

[Christoph Hellwig]

On Tue, Dec 03, 2019 at 01:49:03AM +0900, Keith Busch wrote:
> Customer or OEM requirments are poorly written, like "Must report NVMe
> version 1.3". Nobody bothers to mention that it must also be compliant
> to that version, or even realize they never cared for those features in
> the first place.
> 
> Compliance testing like from UNH should have caught this before shipping
> with such a device, but it's a cheap device, so maybe they skip that step.
> 
> >  I wonder if we actually do users a favour by allowing that..
> 
> I think it's too late now. We did successfully use such namespaces
> before 5.4, even if they're fundamentally broken.
> 
> Johannes also commented *not* to consider these errors when this
> identification was originally implemented, so either he knew vendors
> screwed this up, or had the forethought to know they would.

Yes. I guess your patch is the best thing for now:

Reviewed-by: Christoph Hellwig <hch@lst.de>

But I think we might need a new kernel tain flag or something like
it for devices that are so obviously broken in their identifiers.

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Re: [PATCH] nvme: Namepace identification descriptor list is optional

[Keith Busch]

On Mon, Dec 02, 2019 at 06:34:14PM +0100, Christoph Hellwig wrote:
> Yes. I guess your patch is the best thing for now:
> 
> Reviewed-by: Christoph Hellwig <hch@lst.de>

Thanks, applied for-5.5
 
> But I think we might need a new kernel tain flag or something like
> it for devices that are so obviously broken in their identifiers.

That's fine with me. We currently just log a warning when an error
is returned here, we can add_taint() too. Which flag do you think?
TAINT_FIRMWARE_WORKAROUND, TAINT_CRAP, or something else?

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Re: [PATCH] nvme: Namepace identification descriptor list is optional

[Ingo Brunberg]

With commit ea43d97, appearing now in kernel 5.7.8, you made my cheap
SSD disfunctional again. For reference, see bug 205679. Maybe you
remember the discussion.

I do not know if this was intentional or not. Maybe you should introduce
a quirk for that particular controller.

Regards
Ingo Brunberg

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Re: [PATCH] nvme: Namepace identification descriptor list is optional

[Sagi Grimberg]

> With commit ea43d97, appearing now in kernel 5.7.8, you made my cheap
> SSD disfunctional again. For reference, see bug 205679. Maybe you
> remember the discussion.
> 
> I do not know if this was intentional or not. Maybe you should introduce
> a quirk for that particular controller.

Either we quirk this controller, or we are back to test specific errors...

What is the pci id of the device to test a quirk?

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Re: [PATCH] nvme: Namepace identification descriptor list is optional

[Ingo Brunberg]

Sagi Grimberg <sagi@grimberg.me> writes:

>> With commit ea43d97, appearing now in kernel 5.7.8, you made my cheap
>> SSD disfunctional again. For reference, see bug 205679. Maybe you
>> remember the discussion.
>>
>> I do not know if this was intentional or not. Maybe you should introduce
>> a quirk for that particular controller.
>
> Either we quirk this controller, or we are back to test specific errors...
>
> What is the pci id of the device to test a quirk?

The PCI ID is 126f:2263

Related old and new bugs on bugzilla.kernel.org with some actual drives
listed are: 205679, 205645, 208583, 208585

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Re: [PATCH] nvme: Namepace identification descriptor list is optional

[Christoph Hellwig]

On Thu, Jul 23, 2020 at 03:23:28AM +0200, Ingo Brunberg wrote:
> Sagi Grimberg <sagi@grimberg.me> writes:
> 
> >> With commit ea43d97, appearing now in kernel 5.7.8, you made my cheap
> >> SSD disfunctional again. For reference, see bug 205679. Maybe you
> >> remember the discussion.
> >>
> >> I do not know if this was intentional or not. Maybe you should introduce
> >> a quirk for that particular controller.
> >
> > Either we quirk this controller, or we are back to test specific errors...
> >
> > What is the pci id of the device to test a quirk?
> 
> The PCI ID is 126f:2263

Please try this patch:

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 05aa568a60af62..0602e0f3e77de9 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1287,18 +1287,6 @@ static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
 	if (status) {
 		dev_warn(ctrl->device,
 			"Identify Descriptors failed (%d)\n", status);
-		 /*
-		  * Don't treat non-retryable errors as fatal, as we potentially
-		  * already have a NGUID or EUI-64.  If we failed with DNR set,
-		  * we want to silently ignore the error as we can still
-		  * identify the device, but if the status has DNR set, we want
-		  * to propagate the error back specifically for the disk
-		  * revalidation flow to make sure we don't abandon the
-		  * device just because of a temporal retry-able error (such
-		  * as path of transport errors).
-		  */
-		if (status > 0 && (status & NVME_SC_DNR) && !nvme_multi_css(ctrl))
-			status = 0;
 		goto free_data;
 	}
 
@@ -1888,7 +1876,9 @@ static int nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid,
 		memcpy(ids->eui64, id->eui64, sizeof(id->eui64));
 	if (ctrl->vs >= NVME_VS(1, 2, 0))
 		memcpy(ids->nguid, id->nguid, sizeof(id->nguid));
-	if (ctrl->vs >= NVME_VS(1, 3, 0) || nvme_multi_css(ctrl))
+	if (nvme_multi_css(ctrl) ||
+	    (ctrl->vs >= NVME_VS(1, 3, 0) &&
+	     !(ctrl->quirks & NVME_QUIRK_NO_NS_DESC_LIST)))
 		return nvme_identify_ns_descs(ctrl, nsid, ids);
 	return 0;
 }
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index c5c1bac797aa5a..4cadaea9034ae4 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -137,6 +137,13 @@ enum nvme_quirks {
 	 * Don't change the value of the temperature threshold feature
 	 */
 	NVME_QUIRK_NO_TEMP_THRESH_CHANGE	= (1 << 14),
+
+	/*
+	 * The controller doesn't handle the Identify Namespace
+	 * Identification Descriptor list subcommand despite claiming
+	 * NVMe 1.3 compliance.
+	 */
+	NVME_QUIRK_NO_NS_DESC_LIST		= (1 << 15),
 };
 
 /*
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 61e612d52d61d6..bac3a3f9c79e0d 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -3181,6 +3181,8 @@ static const struct pci_device_id nvme_id_table[] = {
 	{ PCI_DEVICE(0x1cc1, 0x8201),   /* ADATA SX8200PNP 512GB */
 		.driver_data = NVME_QUIRK_NO_DEEPEST_PS |
 				NVME_QUIRK_IGNORE_DEV_SUBNQN, },
+	{ PCI_DEVICE(0x126f, 0x2263),
+		.driver_data = NVME_QUIRK_NO_NS_DESC_LIST, },
 	{ PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001),
 		.driver_data = NVME_QUIRK_SINGLE_VECTOR },

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Re: [PATCH] nvme: Namepace identification descriptor list is optional

[Ingo Brunberg]

Christoph Hellwig <hch@infradead.org> writes:

> Please try this patch:
>
> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
> index 05aa568a60af62..0602e0f3e77de9 100644
> --- a/drivers/nvme/host/core.c
> +++ b/drivers/nvme/host/core.c
> @@ -1287,18 +1287,6 @@ static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
>  	if (status) {
>  		dev_warn(ctrl->device,
>  			"Identify Descriptors failed (%d)\n", status);
> -		 /*
> -		  * Don't treat non-retryable errors as fatal, as we potentially
> -		  * already have a NGUID or EUI-64.  If we failed with DNR set,
> -		  * we want to silently ignore the error as we can still
> -		  * identify the device, but if the status has DNR set, we want
> -		  * to propagate the error back specifically for the disk
> -		  * revalidation flow to make sure we don't abandon the
> -		  * device just because of a temporal retry-able error (such
> -		  * as path of transport errors).
> -		  */
> -		if (status > 0 && (status & NVME_SC_DNR) && !nvme_multi_css(ctrl))
> -			status = 0;
>  		goto free_data;
>  	}
>
> @@ -1888,7 +1876,9 @@ static int nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid,
>  		memcpy(ids->eui64, id->eui64, sizeof(id->eui64));
>  	if (ctrl->vs >= NVME_VS(1, 2, 0))
>  		memcpy(ids->nguid, id->nguid, sizeof(id->nguid));
> -	if (ctrl->vs >= NVME_VS(1, 3, 0) || nvme_multi_css(ctrl))
> +	if (nvme_multi_css(ctrl) ||
> +	    (ctrl->vs >= NVME_VS(1, 3, 0) &&
> +	     !(ctrl->quirks & NVME_QUIRK_NO_NS_DESC_LIST)))
>  		return nvme_identify_ns_descs(ctrl, nsid, ids);
>  	return 0;
>  }
> diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
> index c5c1bac797aa5a..4cadaea9034ae4 100644
> --- a/drivers/nvme/host/nvme.h
> +++ b/drivers/nvme/host/nvme.h
> @@ -137,6 +137,13 @@ enum nvme_quirks {
>  	 * Don't change the value of the temperature threshold feature
>  	 */
>  	NVME_QUIRK_NO_TEMP_THRESH_CHANGE	= (1 << 14),
> +
> +	/*
> +	 * The controller doesn't handle the Identify Namespace
> +	 * Identification Descriptor list subcommand despite claiming
> +	 * NVMe 1.3 compliance.
> +	 */
> +	NVME_QUIRK_NO_NS_DESC_LIST		= (1 << 15),
>  };
>
>  /*
> diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
> index 61e612d52d61d6..bac3a3f9c79e0d 100644
> --- a/drivers/nvme/host/pci.c
> +++ b/drivers/nvme/host/pci.c
> @@ -3181,6 +3181,8 @@ static const struct pci_device_id nvme_id_table[] = {
>  	{ PCI_DEVICE(0x1cc1, 0x8201),   /* ADATA SX8200PNP 512GB */
>  		.driver_data = NVME_QUIRK_NO_DEEPEST_PS |
>  				NVME_QUIRK_IGNORE_DEV_SUBNQN, },
> +	{ PCI_DEVICE(0x126f, 0x2263),
> +		.driver_data = NVME_QUIRK_NO_NS_DESC_LIST, },
>  	{ PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001),
>  		.driver_data = NVME_QUIRK_SINGLE_VECTOR },

Thanks, the patch works. Maybe it is not too late to make its way into
kernel 5.8.

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Re: [PATCH] nvme: Namepace identification descriptor list is optional

[Sagi Grimberg]

>> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
>> index 05aa568a60af62..0602e0f3e77de9 100644
>> --- a/drivers/nvme/host/core.c
>> +++ b/drivers/nvme/host/core.c
>> @@ -1287,18 +1287,6 @@ static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid,
>>   	if (status) {
>>   		dev_warn(ctrl->device,
>>   			"Identify Descriptors failed (%d)\n", status);
>> -		 /*
>> -		  * Don't treat non-retryable errors as fatal, as we potentially
>> -		  * already have a NGUID or EUI-64.  If we failed with DNR set,
>> -		  * we want to silently ignore the error as we can still
>> -		  * identify the device, but if the status has DNR set, we want
>> -		  * to propagate the error back specifically for the disk
>> -		  * revalidation flow to make sure we don't abandon the
>> -		  * device just because of a temporal retry-able error (such
>> -		  * as path of transport errors).
>> -		  */
>> -		if (status > 0 && (status & NVME_SC_DNR) && !nvme_multi_css(ctrl))
>> -			status = 0;
>>   		goto free_data;
>>   	}
>>
>> @@ -1888,7 +1876,9 @@ static int nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid,
>>   		memcpy(ids->eui64, id->eui64, sizeof(id->eui64));
>>   	if (ctrl->vs >= NVME_VS(1, 2, 0))
>>   		memcpy(ids->nguid, id->nguid, sizeof(id->nguid));
>> -	if (ctrl->vs >= NVME_VS(1, 3, 0) || nvme_multi_css(ctrl))
>> +	if (nvme_multi_css(ctrl) ||
>> +	    (ctrl->vs >= NVME_VS(1, 3, 0) &&
>> +	     !(ctrl->quirks & NVME_QUIRK_NO_NS_DESC_LIST)))
>>   		return nvme_identify_ns_descs(ctrl, nsid, ids);
>>   	return 0;
>>   }
>> diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
>> index c5c1bac797aa5a..4cadaea9034ae4 100644
>> --- a/drivers/nvme/host/nvme.h
>> +++ b/drivers/nvme/host/nvme.h
>> @@ -137,6 +137,13 @@ enum nvme_quirks {
>>   	 * Don't change the value of the temperature threshold feature
>>   	 */
>>   	NVME_QUIRK_NO_TEMP_THRESH_CHANGE	= (1 << 14),
>> +
>> +	/*
>> +	 * The controller doesn't handle the Identify Namespace
>> +	 * Identification Descriptor list subcommand despite claiming
>> +	 * NVMe 1.3 compliance.
>> +	 */
>> +	NVME_QUIRK_NO_NS_DESC_LIST		= (1 << 15),
>>   };
>>
>>   /*
>> diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
>> index 61e612d52d61d6..bac3a3f9c79e0d 100644
>> --- a/drivers/nvme/host/pci.c
>> +++ b/drivers/nvme/host/pci.c
>> @@ -3181,6 +3181,8 @@ static const struct pci_device_id nvme_id_table[] = {
>>   	{ PCI_DEVICE(0x1cc1, 0x8201),   /* ADATA SX8200PNP 512GB */
>>   		.driver_data = NVME_QUIRK_NO_DEEPEST_PS |
>>   				NVME_QUIRK_IGNORE_DEV_SUBNQN, },
>> +	{ PCI_DEVICE(0x126f, 0x2263),
>> +		.driver_data = NVME_QUIRK_NO_NS_DESC_LIST, },
>>   	{ PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) },
>>   	{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001),
>>   		.driver_data = NVME_QUIRK_SINGLE_VECTOR },
> 
> Thanks, the patch works. Maybe it is not too late to make its way into
> kernel 5.8.
> 

Patch looks good, you can add my
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>

on the formal patch.

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Re: [PATCH] nvme: Namepace identification descriptor list is optional

[Ingo Brunberg]

"Rajashekar, Revanth" <revanth.rajashekar@intel.com> writes:

> Hi,
>
> On 7/10/2020 2:22 AM, Ingo Brunberg wrote:
>
>  With commit ea43d97, appearing now in kernel 5.7.8, you made my
>  cheap
> SSD disfunctional again. For reference, see bug 205679. Maybe you
> remember the discussion.
>
> Shouldn't the logic used in commit ea43d97, be applied to the line 'if (ret == -ENOMEM || (ret > 0 &&
> !(ret & NVME_SC_DNR)))' in function '_nvme_revalidate_disk' ?

I was wondering the same. But that does not make my drive
work. Something about that logic is not quite right. If the condition is
met in nvme_identify_ns_descs, 0 is returned. So there is no point in
repeating the same test in nvme_revalidate_disk as that code path is not
reached anyway.

If I got it right, NVME_SC_DNR is not set for my drive, so this test is
not the right solution for that problematic controller.

Regards
Ingo Brunberg

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Re: [PATCH] nvme: Namepace identification descriptor list is optional

[Rajashekar, Revanth]

On 7/12/2020 3:31 AM, Ingo Brunberg wrote:
> "Rajashekar, Revanth" <revanth.rajashekar@intel.com> writes:
>
>> Hi,
>>
>> On 7/10/2020 2:22 AM, Ingo Brunberg wrote:
>>
>>  With commit ea43d97, appearing now in kernel 5.7.8, you made my
>>  cheap
>> SSD disfunctional again. For reference, see bug 205679. Maybe you
>> remember the discussion.
>>
>> Shouldn't the logic used in commit ea43d97, be applied to the line 'if (ret == -ENOMEM || (ret > 0 &&
>> !(ret & NVME_SC_DNR)))' in function '_nvme_revalidate_disk' ?
> I was wondering the same. But that does not make my drive
> work. Something about that logic is not quite right. If the condition is
> met in nvme_identify_ns_descs, 0 is returned. So there is no point in
> repeating the same test in nvme_revalidate_disk as that code path is not
> reached anyway.

I agree with that... My concern is in case if the status had the DNR bit cleared.

In  that case this line of the code is reached and the status is silently suppressed to 0 because of the condition !(ret & NVME_SC_DNR)

The intention of the commit ea43d97 was to navigate back the error in-case if it was a retryable error (DNR cleared to 0).

>
> If I got it right, NVME_SC_DNR is not set for my drive, so this test is
> not the right solution for that problematic controller.
>
> Regards
> Ingo Brunberg

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Re: [PATCH] nvme: Namepace identification descriptor list is optional

[Keith Busch]

On Sun, Jul 12, 2020 at 11:31:18AM +0200, Ingo Brunberg wrote:
> If I got it right, NVME_SC_DNR is not set for my drive, so this test is
> not the right solution for that problematic controller.

So your controller claims v1.3 spec compliance, but does not implement a
required command type, then tells the host that we should retry that
command...

I did mention the DNR reliance seemed a bit fragile considering the check
was supposed to be for non-compliant controllers. The check as it exists
is fixing real issues, though. I don't have an idea off the top of my
head for a generic solution that will work with your controller and the
issue the existing code addresses, but will think about it a bit more.

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