[PATCHv4 0/4] Fixup return value for nvme_submit_sync_cmd()

[PATCHv4 0/4] Fixup return value for nvme_submit_sync_cmd()

[Hannes Reinecke]

Hi all,

here are some small patches for fixing up the return value of
nvme_submit_sync_cmd().
As Keith correctly noted, nvme_submit_sync_cmd() should be returning
an error if the command could not be performed; however, currently
only pci does that.
So we need to fix up nvme_cancel_request() to return an -EINTR
on any pending sync commands during reset.
And modify nvme-fc to return the same nvme status after timing out
or cancelling requests.

As usual, comments and reviews are welcome.

Changes to v3:
- Dropped patch to change the status code for aborted commands
- Dropped patch to set -ETIMEDOUT on timed out commands
- Include reviews from Chao Leng

Changes to v2:
- Include reviews from Sagi
- Simplify error logic from nvme_validate_ns()

Changes to v1:
- Include reviews from Daniel
- Include changes for nvme-fc to return the same status as the
  other transports

Hannes Reinecke (4):
  nvme: simplify error logic in nvme_validate_ns()
  nvme: add NVME_REQ_CANCELLED flag in nvme_cancel_request()
  nvme-fc: set NVME_REQ_CANCELLED in nvme_fc_terminate_exchange()
  nvme-fc: return NVME_SC_HOST_ABORTED_CMD when a command has been
    aborted

 drivers/nvme/host/core.c | 9 +++++----
 drivers/nvme/host/fc.c   | 3 ++-
 2 files changed, 7 insertions(+), 5 deletions(-)

-- 
2.29.2


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[PATCH 1/4] nvme: simplify error logic in nvme_validate_ns()

[Hannes Reinecke]

We only should remove namespaces when we get fatal error back from
the device or when the namespace IDs have changed.
So instead of painfully masking out error numbers which might indicate
that the error should be ignored we could use an NVME status code
to indicated when the namespace should be removed.
That simplifies the final logic and makes it less error-prone.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
---
 drivers/nvme/host/core.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index d77f3f26d8d3..bde1b22ca7f2 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1439,7 +1439,7 @@ static int nvme_identify_ns(struct nvme_ctrl *ctrl, unsigned nsid,
 		goto out_free_id;
 	}
 
-	error = -ENODEV;
+	error = NVME_SC_INVALID_NS | NVME_SC_DNR;
 	if ((*id)->ncap == 0) /* namespace not allocated or attached */
 		goto out_free_id;
 
@@ -4036,7 +4036,7 @@ static void nvme_ns_remove_by_nsid(struct nvme_ctrl *ctrl, u32 nsid)
 static void nvme_validate_ns(struct nvme_ns *ns, struct nvme_ns_ids *ids)
 {
 	struct nvme_id_ns *id;
-	int ret = -ENODEV;
+	int ret = NVME_SC_INVALID_NS | NVME_SC_DNR;
 
 	if (test_bit(NVME_NS_DEAD, &ns->flags))
 		goto out;
@@ -4045,7 +4045,7 @@ static void nvme_validate_ns(struct nvme_ns *ns, struct nvme_ns_ids *ids)
 	if (ret)
 		goto out;
 
-	ret = -ENODEV;
+	ret = NVME_SC_INVALID_NS | NVME_SC_DNR;
 	if (!nvme_ns_ids_equal(&ns->head->ids, ids)) {
 		dev_err(ns->ctrl->device,
 			"identifiers changed for nsid %d\n", ns->head->ns_id);
@@ -4063,7 +4063,7 @@ static void nvme_validate_ns(struct nvme_ns *ns, struct nvme_ns_ids *ids)
 	 *
 	 * TODO: we should probably schedule a delayed retry here.
 	 */
-	if (ret && ret != -ENOMEM && !(ret > 0 && !(ret & NVME_SC_DNR)))
+	if (ret > 0 && (ret & NVME_SC_DNR))
 		nvme_ns_remove(ns);
 }
 
-- 
2.29.2


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Re: [PATCH 1/4] nvme: simplify error logic in nvme_validate_ns()

[Daniel Wagner]

Hi Hannes,

On Fri, Feb 26, 2021 at 08:17:25AM +0100, Hannes Reinecke wrote:
> @@ -4045,7 +4045,7 @@ static void nvme_validate_ns(struct nvme_ns *ns, struct nvme_ns_ids *ids)
>  	if (ret)
>  		goto out;
>  
> -	ret = -ENODEV;
> +	ret = NVME_SC_INVALID_NS | NVME_SC_DNR;
>  	if (!nvme_ns_ids_equal(&ns->head->ids, ids)) {
>  		dev_err(ns->ctrl->device,
>  			"identifiers changed for nsid %d\n", ns->head->ns_id);
> @@ -4063,7 +4063,7 @@ static void nvme_validate_ns(struct nvme_ns *ns, struct nvme_ns_ids *ids)
>  	 *
>  	 * TODO: we should probably schedule a delayed retry here.
>  	 */
> -	if (ret && ret != -ENOMEM && !(ret > 0 && !(ret & NVME_SC_DNR)))
> +	if (ret > 0 && (ret & NVME_SC_DNR))
>  		nvme_ns_remove(ns);

I think Chao's comment still holds, nvme_update_ns_info() can return
-EINVAL, -IEO or -ENODEV. Don't we have to remove the NS in these
cases?

Thanks,
Daniel

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Re: [PATCH 1/4] nvme: simplify error logic in nvme_validate_ns()

[Hannes Reinecke]

On 2/26/21 10:10 AM, Daniel Wagner wrote:
> Hi Hannes,
> 
> On Fri, Feb 26, 2021 at 08:17:25AM +0100, Hannes Reinecke wrote:
>> @@ -4045,7 +4045,7 @@ static void nvme_validate_ns(struct nvme_ns *ns, struct nvme_ns_ids *ids)
>>   	if (ret)
>>   		goto out;
>>   
>> -	ret = -ENODEV;
>> +	ret = NVME_SC_INVALID_NS | NVME_SC_DNR;
>>   	if (!nvme_ns_ids_equal(&ns->head->ids, ids)) {
>>   		dev_err(ns->ctrl->device,
>>   			"identifiers changed for nsid %d\n", ns->head->ns_id);
>> @@ -4063,7 +4063,7 @@ static void nvme_validate_ns(struct nvme_ns *ns, struct nvme_ns_ids *ids)
>>   	 *
>>   	 * TODO: we should probably schedule a delayed retry here.
>>   	 */
>> -	if (ret && ret != -ENOMEM && !(ret > 0 && !(ret & NVME_SC_DNR)))
>> +	if (ret > 0 && (ret & NVME_SC_DNR))
>>   		nvme_ns_remove(ns);
> 
> I think Chao's comment still holds, nvme_update_ns_info() can return
> -EINVAL, -IEO or -ENODEV. Don't we have to remove the NS in these
> cases?
> 
I thought I had fixed up all instances where we can return -ENODEV; and 
all others are indeed transport or transient error which should not 
result in a namespace removal.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
hare@suse.de                              +49 911 74053 688
SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), Geschäftsführer: Felix Imendörffer

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Re: [PATCH 1/4] nvme: simplify error logic in nvme_validate_ns()

[Daniel Wagner]

On Fri, Feb 26, 2021 at 10:24:46AM +0100, Hannes Reinecke wrote:
> I thought I had fixed up all instances where we can return -ENODEV; and all
> others are indeed transport or transient error which should not result in a
> namespace removal.

I think I was digging through the wrong tree. There is indeed no ENODEV
in nvme/nvme-5.12. Sorry about the noise.

Reviewed-by: Daniel Wagner <dwagner@suse.de>



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Re: [PATCH 1/4] nvme: simplify error logic in nvme_validate_ns()

[Sagi Grimberg]

On 2/25/21 11:17 PM, Hannes Reinecke wrote:
> We only should remove namespaces when we get fatal error back from
> the device or when the namespace IDs have changed.
> So instead of painfully masking out error numbers which might indicate
> that the error should be ignored we could use an NVME status code
> to indicated when the namespace should be removed.
> That simplifies the final logic and makes it less error-prone.
> 
> Signed-off-by: Hannes Reinecke <hare@suse.de>
> Reviewed-by: Keith Busch <kbusch@kernel.org>
> ---
>   drivers/nvme/host/core.c | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
> index d77f3f26d8d3..bde1b22ca7f2 100644
> --- a/drivers/nvme/host/core.c
> +++ b/drivers/nvme/host/core.c
> @@ -1439,7 +1439,7 @@ static int nvme_identify_ns(struct nvme_ctrl *ctrl, unsigned nsid,
>   		goto out_free_id;
>   	}
>   
> -	error = -ENODEV;
> +	error = NVME_SC_INVALID_NS | NVME_SC_DNR;
>   	if ((*id)->ncap == 0) /* namespace not allocated or attached */
>   		goto out_free_id;
>   
> @@ -4036,7 +4036,7 @@ static void nvme_ns_remove_by_nsid(struct nvme_ctrl *ctrl, u32 nsid)
>   static void nvme_validate_ns(struct nvme_ns *ns, struct nvme_ns_ids *ids)
>   {
>   	struct nvme_id_ns *id;
> -	int ret = -ENODEV;
> +	int ret = NVME_SC_INVALID_NS | NVME_SC_DNR;
>   
>   	if (test_bit(NVME_NS_DEAD, &ns->flags))
>   		goto out;
> @@ -4045,7 +4045,7 @@ static void nvme_validate_ns(struct nvme_ns *ns, struct nvme_ns_ids *ids)
>   	if (ret)
>   		goto out;
>   
> -	ret = -ENODEV;
> +	ret = NVME_SC_INVALID_NS | NVME_SC_DNR;
>   	if (!nvme_ns_ids_equal(&ns->head->ids, ids)) {
>   		dev_err(ns->ctrl->device,
>   			"identifiers changed for nsid %d\n", ns->head->ns_id);
> @@ -4063,7 +4063,7 @@ static void nvme_validate_ns(struct nvme_ns *ns, struct nvme_ns_ids *ids)
>   	 *
>   	 * TODO: we should probably schedule a delayed retry here.
>   	 */
> -	if (ret && ret != -ENOMEM && !(ret > 0 && !(ret & NVME_SC_DNR)))
> +	if (ret > 0 && (ret & NVME_SC_DNR))
>   		nvme_ns_remove(ns);
>   }

This looks ok to me,

Reviewed-by: Sagi Grimberg <sagi@grimberg.me>

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[PATCH 2/4] nvme: add NVME_REQ_CANCELLED flag in nvme_cancel_request()

[Hannes Reinecke]

NVME_REQ_CANCELLED is translated into -EINTR in nvme_submit_sync_cmd(),
so we should be setting this flags during nvme_cancel_request() to
ensure that the callers to nvme_submit_sync_cmd() will get the correct
error code when the controller is reset.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Chao Leng <lengchao@huawei.com>
---
 drivers/nvme/host/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index bde1b22ca7f2..bf32460c180a 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -380,6 +380,7 @@ bool nvme_cancel_request(struct request *req, void *data, bool reserved)
 		return true;
 
 	nvme_req(req)->status = NVME_SC_HOST_ABORTED_CMD;
+	nvme_req(req)->flags |= NVME_REQ_CANCELLED;
 	blk_mq_complete_request(req);
 	return true;
 }
-- 
2.29.2


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Re: [PATCH 2/4] nvme: add NVME_REQ_CANCELLED flag in nvme_cancel_request()

[Sagi Grimberg]

Reviewed-by: Sagi Grimberg <sagi@grimberg.me>

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[PATCH 3/4] nvme-fc: set NVME_REQ_CANCELLED in nvme_fc_terminate_exchange()

[Hannes Reinecke]

nvme_fc_terminate_exchange() is being called when exchanges are
being deleted, and as such we should be setting the NVME_REQ_CANCELLED
flag to have identical behaviour on all transports.

Cc: James Smart <james.smart@broadcom.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
---
 drivers/nvme/host/fc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index 20dadd86e981..ef12a619daec 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -2443,6 +2443,7 @@ nvme_fc_terminate_exchange(struct request *req, void *data, bool reserved)
 	struct nvme_fc_ctrl *ctrl = to_fc_ctrl(nctrl);
 	struct nvme_fc_fcp_op *op = blk_mq_rq_to_pdu(req);
 
+	op->nreq.flags |= NVME_REQ_CANCELLED;
 	__nvme_fc_abort_op(ctrl, op);
 	return true;
 }
-- 
2.29.2


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Re: [PATCH 3/4] nvme-fc: set NVME_REQ_CANCELLED in nvme_fc_terminate_exchange()

[Sagi Grimberg]

Reviewed-by: Sagi Grimberg <sagi@grimberg.me>

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Re: [PATCH 3/4] nvme-fc: set NVME_REQ_CANCELLED in nvme_fc_terminate_exchange()

[James Smart]

On 2/25/2021 11:17 PM, Hannes Reinecke wrote:
> nvme_fc_terminate_exchange() is being called when exchanges are
> being deleted, and as such we should be setting the NVME_REQ_CANCELLED
> flag to have identical behaviour on all transports.
> 
> Cc: James Smart <james.smart@broadcom.com>
> Signed-off-by: Hannes Reinecke <hare@suse.de>
> Reviewed-by: Daniel Wagner <dwagner@suse.de>
> Reviewed-by: Keith Busch <kbusch@kernel.org>
> ---

Reviewed-by: James Smart <jsmart2021@gmail.com>

Looks good.

-- james


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[PATCH 4/4] nvme-fc: return NVME_SC_HOST_ABORTED_CMD when a command has been aborted

[Hannes Reinecke]

When a command has been aborted we should return NVME_SC_HOST_ABORTED_CMD
to be consistent with the other transports.

Cc: James Smart <james.smart@broadcom.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
---
 drivers/nvme/host/fc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index ef12a619daec..97e3424c7b03 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -1956,7 +1956,7 @@ nvme_fc_fcpio_done(struct nvmefc_fcp_req *req)
 				sizeof(op->rsp_iu), DMA_FROM_DEVICE);
 
 	if (opstate == FCPOP_STATE_ABORTED)
-		status = cpu_to_le16(NVME_SC_HOST_PATH_ERROR << 1);
+		status = cpu_to_le16(NVME_SC_HOST_ABORTED_CMD << 1);
 	else if (freq->status) {
 		status = cpu_to_le16(NVME_SC_HOST_PATH_ERROR << 1);
 		dev_info(ctrl->ctrl.device,
-- 
2.29.2


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Re: [PATCH 4/4] nvme-fc: return NVME_SC_HOST_ABORTED_CMD when a command has been aborted

[James Smart]

On 2/25/2021 11:17 PM, Hannes Reinecke wrote:
> When a command has been aborted we should return NVME_SC_HOST_ABORTED_CMD
> to be consistent with the other transports.
>
> Cc: James Smart <james.smart@broadcom.com>
> Signed-off-by: Hannes Reinecke <hare@suse.de>
> Reviewed-by: Daniel Wagner <dwagner@suse.de>
> ---
>   drivers/nvme/host/fc.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
> index ef12a619daec..97e3424c7b03 100644
> --- a/drivers/nvme/host/fc.c
> +++ b/drivers/nvme/host/fc.c
> @@ -1956,7 +1956,7 @@ nvme_fc_fcpio_done(struct nvmefc_fcp_req *req)
>   				sizeof(op->rsp_iu), DMA_FROM_DEVICE);
>   
>   	if (opstate == FCPOP_STATE_ABORTED)
> -		status = cpu_to_le16(NVME_SC_HOST_PATH_ERROR << 1);
> +		status = cpu_to_le16(NVME_SC_HOST_ABORTED_CMD << 1);
>   	else if (freq->status) {
>   		status = cpu_to_le16(NVME_SC_HOST_PATH_ERROR << 1);
>   		dev_info(ctrl->ctrl.device,

Is there a difference between an I/O aborted by a NVME ABORT cmd vs a 
transport-cancelled io ?   This line is more the transport-cancelled io.

-- james


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Re: [PATCH 4/4] nvme-fc: return NVME_SC_HOST_ABORTED_CMD when a command has been aborted

[Hannes Reinecke]

On 3/1/21 8:07 PM, James Smart wrote:
> On 2/25/2021 11:17 PM, Hannes Reinecke wrote:
>> When a command has been aborted we should return NVME_SC_HOST_ABORTED_CMD
>> to be consistent with the other transports.
>>
>> Cc: James Smart <james.smart@broadcom.com>
>> Signed-off-by: Hannes Reinecke <hare@suse.de>
>> Reviewed-by: Daniel Wagner <dwagner@suse.de>
>> ---
>>   drivers/nvme/host/fc.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
>> index ef12a619daec..97e3424c7b03 100644
>> --- a/drivers/nvme/host/fc.c
>> +++ b/drivers/nvme/host/fc.c
>> @@ -1956,7 +1956,7 @@ nvme_fc_fcpio_done(struct nvmefc_fcp_req *req)
>>                   sizeof(op->rsp_iu), DMA_FROM_DEVICE);
>>         if (opstate == FCPOP_STATE_ABORTED)
>> -        status = cpu_to_le16(NVME_SC_HOST_PATH_ERROR << 1);
>> +        status = cpu_to_le16(NVME_SC_HOST_ABORTED_CMD << 1);
>>       else if (freq->status) {
>>           status = cpu_to_le16(NVME_SC_HOST_PATH_ERROR << 1);
>>           dev_info(ctrl->ctrl.device,
> 
> Is there a difference between an I/O aborted by a NVME ABORT cmd vs a
> transport-cancelled io ?   This line is more the transport-cancelled io.
> 
Well, as we have several distinct error codes for that:

0x07 (Command abort requested) is for commands terminated by NVME Abort
0x08 (Command aborted due to SQ deletion) is for commands terminated due
to an explicit 'Delete I/O submission queue' command
0x370 (Host pathing error) is for any random host pathing error
0x371 (Command aborted by host) is for commands being aborted 'as a
result of a host action'

arguably both (0x370 and 0x371) can be used when failing I/O on path
loss, but all other transports are using 0x371 here, so FC really should
be using the same convention to have consistent error handling.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		           Kernel Storage Architect
hare@suse.de			                  +49 911 74053 688
SUSE Software Solutions Germany GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), GF: Felix Imendörffer

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Re: [PATCH 4/4] nvme-fc: return NVME_SC_HOST_ABORTED_CMD when a command has been aborted

[Sagi Grimberg]

Reviewed-by: Sagi Grimberg <sagi@grimberg.me>

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Re: [PATCH 4/4] nvme-fc: return NVME_SC_HOST_ABORTED_CMD when a command has been aborted

[James Smart]

On 2/25/2021 11:17 PM, Hannes Reinecke wrote:
> When a command has been aborted we should return NVME_SC_HOST_ABORTED_CMD
> to be consistent with the other transports.
> 
> Cc: James Smart <james.smart@broadcom.com>
> Signed-off-by: Hannes Reinecke <hare@suse.de>
> Reviewed-by: Daniel Wagner <dwagner@suse.de>
> ---
>   drivers/nvme/host/fc.c | 2 +-

Reviewed-by: James Smart <jsmart2021@gmail.com>

Looks good.

-- james



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Re: [PATCHv4 0/4] Fixup return value for nvme_submit_sync_cmd()

[Chao Leng]

On 2021/2/26 15:17, Hannes Reinecke wrote:
> Hi all,
> 
> here are some small patches for fixing up the return value of
> nvme_submit_sync_cmd().
> As Keith correctly noted, nvme_submit_sync_cmd() should be returning
> an error if the command could not be performed; however, currently
> only pci does that.
> So we need to fix up nvme_cancel_request() to return an -EINTR
> on any pending sync commands during reset.
> And modify nvme-fc to return the same nvme status after timing out
> or cancelling requests.
> 
> As usual, comments and reviews are welcome.
> 
> Changes to v3:
> - Dropped patch to change the status code for aborted commands
> - Dropped patch to set -ETIMEDOUT on timed out commands
->timeout() also need to consider, maybe can add the flag:NVME_REQ_CANCELLED
like nvme_cancel_request.
> - Include reviews from Chao Leng
> 
> Changes to v2:
> - Include reviews from Sagi
> - Simplify error logic from nvme_validate_ns()
> 
> Changes to v1:
> - Include reviews from Daniel
> - Include changes for nvme-fc to return the same status as the
>    other transports
> 
> Hannes Reinecke (4):
>    nvme: simplify error logic in nvme_validate_ns()
>    nvme: add NVME_REQ_CANCELLED flag in nvme_cancel_request()
>    nvme-fc: set NVME_REQ_CANCELLED in nvme_fc_terminate_exchange()
>    nvme-fc: return NVME_SC_HOST_ABORTED_CMD when a command has been
>      aborted
> 
>   drivers/nvme/host/core.c | 9 +++++----
>   drivers/nvme/host/fc.c   | 3 ++-
>   2 files changed, 7 insertions(+), 5 deletions(-)
> 

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Re: [PATCHv4 0/4] Fixup return value for nvme_submit_sync_cmd()

[Christoph Hellwig]

Thanks,

applied to nvme-5.12.

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