[PATCH 0/2] nvme-multipath: fixes for non-optimized paths

[PATCH 0/2] nvme-multipath: fixes for non-optimized paths

[Hannes Reinecke]

Hi all,

one of our partners informed us that the round-robin path selector
didn't do the right thing when only one optimized path (or, indeed,
none at all) are present.
These patches will fixup nvme_round_robin() to handle the case when
less than two optimized (but several non-optimized) paths are present.

These pathes are a rework of the earlier patches send by Martin Wilck.

As usual, comments and reviews are welcome.

Hannes Reinecke (1):
  nvme-multipath: do not fall back to __nvme_find_path() for
    non-optimized paths

Martin Wilck (1):
  nvme-multipath: fix logic for non-optimized paths

 drivers/nvme/host/multipath.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

-- 
2.16.4


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[PATCH 1/2] nvme-multipath: fix logic for non-optimized paths

[Hannes Reinecke]

From: Martin Wilck <mwilck@suse.com>

Handle the special case where we have exactly one optimized path,
which we should keep using in this case.

Signed off-by: Martin Wilck <mwilck@suse.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 drivers/nvme/host/multipath.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 66509472fe06..fe8f7f123fac 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -246,6 +246,12 @@ static struct nvme_ns *nvme_round_robin_path(struct nvme_ns_head *head,
 			fallback = ns;
 	}
 
+	/* No optimized path found, re-check the current path */
+	if (!nvme_path_is_disabled(old) &&
+	    old->ana_state == NVME_ANA_OPTIMIZED) {
+		found = old;
+		goto out;
+	}
 	if (!fallback)
 		return NULL;
 	found = fallback;
-- 
2.16.4


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[PATCH 2/2] nvme-multipath: do not fall back to __nvme_find_path() for non-optimized paths

[Hannes Reinecke]

When nvme_round_robin_path() finds a valid namespace we should be using it;
falling back to __nvme_find_path() for non-optimized paths will cause the
result from nvme_round_robin_path() to be ignored for non-optimized paths.

Signed-off-by: Martin Wilck <mwilck@suse.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 drivers/nvme/host/multipath.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index fe8f7f123fac..97d3c19b5684 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -272,8 +272,11 @@ inline struct nvme_ns *nvme_find_path(struct nvme_ns_head *head)
 	struct nvme_ns *ns;
 
 	ns = srcu_dereference(head->current_path[node], &head->srcu);
-	if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR && ns)
+	if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR && ns) {
 		ns = nvme_round_robin_path(head, node, ns);
+		if (ns)
+			return ns;
+	}
 	if (unlikely(!ns || !nvme_path_is_optimized(ns)))
 		ns = __nvme_find_path(head, node);
 	return ns;
-- 
2.16.4


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Re: [PATCH 1/2] nvme-multipath: fix logic for non-optimized paths

[Sagi Grimberg]

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

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Re: [PATCH 2/2] nvme-multipath: do not fall back to __nvme_find_path() for non-optimized paths

[Sagi Grimberg]

On 7/27/20 9:08 AM, Hannes Reinecke wrote:
> When nvme_round_robin_path() finds a valid namespace we should be using it;
> falling back to __nvme_find_path() for non-optimized paths will cause the
> result from nvme_round_robin_path() to be ignored for non-optimized paths.
> 
> Signed-off-by: Martin Wilck <mwilck@suse.com>
> Signed-off-by: Hannes Reinecke <hare@suse.de>
> ---
>   drivers/nvme/host/multipath.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
> index fe8f7f123fac..97d3c19b5684 100644
> --- a/drivers/nvme/host/multipath.c
> +++ b/drivers/nvme/host/multipath.c
> @@ -272,8 +272,11 @@ inline struct nvme_ns *nvme_find_path(struct nvme_ns_head *head)
>   	struct nvme_ns *ns;
>   
>   	ns = srcu_dereference(head->current_path[node], &head->srcu);
> -	if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR && ns)
> +	if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR && ns) {
>   		ns = nvme_round_robin_path(head, node, ns);
> +		if (ns)
> +			return ns;
> +	}
>   	if (unlikely(!ns || !nvme_path_is_optimized(ns)))
>   		ns = __nvme_find_path(head, node);

Maybe instead of the early return put the following condition on else?

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Re: [PATCH 2/2] nvme-multipath: do not fall back to __nvme_find_path() for non-optimized paths

[Hannes Reinecke]

On 7/27/20 9:46 PM, Sagi Grimberg wrote:
> 
> 
> On 7/27/20 9:08 AM, Hannes Reinecke wrote:
>> When nvme_round_robin_path() finds a valid namespace we should be 
>> using it;
>> falling back to __nvme_find_path() for non-optimized paths will cause the
>> result from nvme_round_robin_path() to be ignored for non-optimized 
>> paths.
>>
>> Signed-off-by: Martin Wilck <mwilck@suse.com>
>> Signed-off-by: Hannes Reinecke <hare@suse.de>
>> ---
>>   drivers/nvme/host/multipath.c | 5 ++++-
>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/nvme/host/multipath.c 
>> b/drivers/nvme/host/multipath.c
>> index fe8f7f123fac..97d3c19b5684 100644
>> --- a/drivers/nvme/host/multipath.c
>> +++ b/drivers/nvme/host/multipath.c
>> @@ -272,8 +272,11 @@ inline struct nvme_ns *nvme_find_path(struct 
>> nvme_ns_head *head)
>>       struct nvme_ns *ns;
>>       ns = srcu_dereference(head->current_path[node], &head->srcu);
>> -    if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR && ns)
>> +    if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR && ns) {
>>           ns = nvme_round_robin_path(head, node, ns);
>> +        if (ns)
>> +            return ns;
>> +    }
>>       if (unlikely(!ns || !nvme_path_is_optimized(ns)))
>>           ns = __nvme_find_path(head, node);
> 
> Maybe instead of the early return put the following condition on else?

That depends on whether we want to have a fallback to __nvme_find_path() 
or not. With your suggestion we would lose that; I'd rather keep it.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke            Teamlead Storage & Networking
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 2/2] nvme-multipath: do not fall back to __nvme_find_path() for non-optimized paths

[Sagi Grimberg]

>>> When nvme_round_robin_path() finds a valid namespace we should be 
>>> using it;
>>> falling back to __nvme_find_path() for non-optimized paths will cause 
>>> the
>>> result from nvme_round_robin_path() to be ignored for non-optimized 
>>> paths.
>>>
>>> Signed-off-by: Martin Wilck <mwilck@suse.com>
>>> Signed-off-by: Hannes Reinecke <hare@suse.de>
>>> ---
>>>   drivers/nvme/host/multipath.c | 5 ++++-
>>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/nvme/host/multipath.c 
>>> b/drivers/nvme/host/multipath.c
>>> index fe8f7f123fac..97d3c19b5684 100644
>>> --- a/drivers/nvme/host/multipath.c
>>> +++ b/drivers/nvme/host/multipath.c
>>> @@ -272,8 +272,11 @@ inline struct nvme_ns *nvme_find_path(struct 
>>> nvme_ns_head *head)
>>>       struct nvme_ns *ns;
>>>       ns = srcu_dereference(head->current_path[node], &head->srcu);
>>> -    if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR && ns)
>>> +    if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR && ns) {
>>>           ns = nvme_round_robin_path(head, node, ns);
>>> +        if (ns)
>>> +            return ns;
>>> +    }
>>>       if (unlikely(!ns || !nvme_path_is_optimized(ns)))
>>>           ns = __nvme_find_path(head, node);
>>
>> Maybe instead of the early return put the following condition on else?
> 
> That depends on whether we want to have a fallback to __nvme_find_path() 
> or not. With your suggestion we would lose that; I'd rather keep it.

OK...

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

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Re: [PATCH 2/2] nvme-multipath: do not fall back to __nvme_find_path() for non-optimized paths

[Christoph Hellwig]

On Tue, Jul 28, 2020 at 08:25:18AM +0200, Hannes Reinecke wrote:
>> Maybe instead of the early return put the following condition on else?
>
> That depends on whether we want to have a fallback to __nvme_find_path() or 
> not. With your suggestion we would lose that; I'd rather keep it.

Why would we want to fall back?  nvme_round_robin_path only
returns NULL in case there is a single disabled path, in which
case __nvme_find_path won't find anything either.  I'd go for something
like this:

---
From 4f578364a3d15898c7d715315a3371b2f71db416 Mon Sep 17 00:00:00 2001
From: Hannes Reinecke <hare@suse.de>
Date: Mon, 27 Jul 2020 18:08:03 +0200
Subject: nvme-multipath: do not fall back to __nvme_find_path() for
 non-optimized paths

When nvme_round_robin_path() finds a valid namespace we should be using it;
falling back to __nvme_find_path() for non-optimized paths will cause the
result from nvme_round_robin_path() to be ignored for non-optimized paths.

Signed-off-by: Martin Wilck <mwilck@suse.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/nvme/host/multipath.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 93c70e1591de8f..3ded54d2c9c6ad 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -281,10 +281,13 @@ inline struct nvme_ns *nvme_find_path(struct nvme_ns_head *head)
 	struct nvme_ns *ns;
 
 	ns = srcu_dereference(head->current_path[node], &head->srcu);
-	if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR && ns)
-		ns = nvme_round_robin_path(head, node, ns);
-	if (unlikely(!ns || !nvme_path_is_optimized(ns)))
-		ns = __nvme_find_path(head, node);
+	if (unlikely(!ns))
+		return __nvme_find_path(head, node);
+
+	if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR)
+		return nvme_round_robin_path(head, node, ns);
+	if (unlikely(!nvme_path_is_optimized(ns)))
+		return __nvme_find_path(head, node);
 	return ns;
 }
 
-- 
2.27.0


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Re: [PATCH 2/2] nvme-multipath: do not fall back to __nvme_find_path() for non-optimized paths

[Hannes Reinecke]

On 7/28/20 10:02 AM, Christoph Hellwig wrote:
> On Tue, Jul 28, 2020 at 08:25:18AM +0200, Hannes Reinecke wrote:
>>> Maybe instead of the early return put the following condition on else?
>>
>> That depends on whether we want to have a fallback to __nvme_find_path() or 
>> not. With your suggestion we would lose that; I'd rather keep it.
> 
> Why would we want to fall back?  nvme_round_robin_path only
> returns NULL in case there is a single disabled path, in which
> case __nvme_find_path won't find anything either.  I'd go for something
> like this:
> 
> ---
> From 4f578364a3d15898c7d715315a3371b2f71db416 Mon Sep 17 00:00:00 2001
> From: Hannes Reinecke <hare@suse.de>
> Date: Mon, 27 Jul 2020 18:08:03 +0200
> Subject: nvme-multipath: do not fall back to __nvme_find_path() for
>  non-optimized paths
> 
> When nvme_round_robin_path() finds a valid namespace we should be using it;
> falling back to __nvme_find_path() for non-optimized paths will cause the
> result from nvme_round_robin_path() to be ignored for non-optimized paths.
> 
> Signed-off-by: Martin Wilck <mwilck@suse.com>
> Signed-off-by: Hannes Reinecke <hare@suse.de>
> Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/nvme/host/multipath.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
> index 93c70e1591de8f..3ded54d2c9c6ad 100644
> --- a/drivers/nvme/host/multipath.c
> +++ b/drivers/nvme/host/multipath.c
> @@ -281,10 +281,13 @@ inline struct nvme_ns *nvme_find_path(struct nvme_ns_head *head)
>  	struct nvme_ns *ns;
>  
>  	ns = srcu_dereference(head->current_path[node], &head->srcu);
> -	if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR && ns)
> -		ns = nvme_round_robin_path(head, node, ns);
> -	if (unlikely(!ns || !nvme_path_is_optimized(ns)))
> -		ns = __nvme_find_path(head, node);
> +	if (unlikely(!ns))
> +		return __nvme_find_path(head, node);
> +
> +	if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR)
> +		return nvme_round_robin_path(head, node, ns);
> +	if (unlikely(!nvme_path_is_optimized(ns)))
> +		return __nvme_find_path(head, node);
>  	return ns;
>  }
>  
> 

Yes, that would work, too.

Should I resend?

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 2/2] nvme-multipath: do not fall back to __nvme_find_path() for non-optimized paths

[Christoph Hellwig]

On Tue, Jul 28, 2020 at 10:14:14AM +0200, Hannes Reinecke wrote:
> On 7/28/20 10:02 AM, Christoph Hellwig wrote:
> > On Tue, Jul 28, 2020 at 08:25:18AM +0200, Hannes Reinecke wrote:
> >>> Maybe instead of the early return put the following condition on else?
> >>
> >> That depends on whether we want to have a fallback to __nvme_find_path() or 
> >> not. With your suggestion we would lose that; I'd rather keep it.
> > 
> > Why would we want to fall back?  nvme_round_robin_path only
> > returns NULL in case there is a single disabled path, in which
> > case __nvme_find_path won't find anything either.  I'd go for something
> > like this:
> > 
> > ---
> > From 4f578364a3d15898c7d715315a3371b2f71db416 Mon Sep 17 00:00:00 2001
> > From: Hannes Reinecke <hare@suse.de>
> > Date: Mon, 27 Jul 2020 18:08:03 +0200
> > Subject: nvme-multipath: do not fall back to __nvme_find_path() for
> >  non-optimized paths
> > 
> > When nvme_round_robin_path() finds a valid namespace we should be using it;
> > falling back to __nvme_find_path() for non-optimized paths will cause the
> > result from nvme_round_robin_path() to be ignored for non-optimized paths.
> > 
> > Signed-off-by: Martin Wilck <mwilck@suse.com>
> > Signed-off-by: Hannes Reinecke <hare@suse.de>
> > Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
> > Signed-off-by: Christoph Hellwig <hch@lst.de>
> > ---
> >  drivers/nvme/host/multipath.c | 11 +++++++----
> >  1 file changed, 7 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
> > index 93c70e1591de8f..3ded54d2c9c6ad 100644
> > --- a/drivers/nvme/host/multipath.c
> > +++ b/drivers/nvme/host/multipath.c
> > @@ -281,10 +281,13 @@ inline struct nvme_ns *nvme_find_path(struct nvme_ns_head *head)
> >  	struct nvme_ns *ns;
> >  
> >  	ns = srcu_dereference(head->current_path[node], &head->srcu);
> > -	if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR && ns)
> > -		ns = nvme_round_robin_path(head, node, ns);
> > -	if (unlikely(!ns || !nvme_path_is_optimized(ns)))
> > -		ns = __nvme_find_path(head, node);
> > +	if (unlikely(!ns))
> > +		return __nvme_find_path(head, node);
> > +
> > +	if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR)
> > +		return nvme_round_robin_path(head, node, ns);
> > +	if (unlikely(!nvme_path_is_optimized(ns)))
> > +		return __nvme_find_path(head, node);
> >  	return ns;
> >  }
> >  
> > 
> 
> Yes, that would work, too.
> 
> Should I resend?

No need, I can apply it with the modification.   But if you have a
RR test setup it would be great to run it through that again, just in
case.

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Re: [PATCH 2/2] nvme-multipath: do not fall back to __nvme_find_path() for non-optimized paths

[Hannes Reinecke]

On 7/28/20 10:16 AM, Christoph Hellwig wrote:
> On Tue, Jul 28, 2020 at 10:14:14AM +0200, Hannes Reinecke wrote:
>> On 7/28/20 10:02 AM, Christoph Hellwig wrote:
>>> On Tue, Jul 28, 2020 at 08:25:18AM +0200, Hannes Reinecke wrote:
>>>>> Maybe instead of the early return put the following condition on else?
>>>>
>>>> That depends on whether we want to have a fallback to __nvme_find_path() or 
>>>> not. With your suggestion we would lose that; I'd rather keep it.
>>>
>>> Why would we want to fall back?  nvme_round_robin_path only
>>> returns NULL in case there is a single disabled path, in which
>>> case __nvme_find_path won't find anything either.  I'd go for something
>>> like this:
>>>
>>> ---
>>> From 4f578364a3d15898c7d715315a3371b2f71db416 Mon Sep 17 00:00:00 2001
>>> From: Hannes Reinecke <hare@suse.de>
>>> Date: Mon, 27 Jul 2020 18:08:03 +0200
>>> Subject: nvme-multipath: do not fall back to __nvme_find_path() for
>>>  non-optimized paths
>>>
>>> When nvme_round_robin_path() finds a valid namespace we should be using it;
>>> falling back to __nvme_find_path() for non-optimized paths will cause the
>>> result from nvme_round_robin_path() to be ignored for non-optimized paths.
>>>
>>> Signed-off-by: Martin Wilck <mwilck@suse.com>
>>> Signed-off-by: Hannes Reinecke <hare@suse.de>
>>> Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
>>> Signed-off-by: Christoph Hellwig <hch@lst.de>
>>> ---
>>>  drivers/nvme/host/multipath.c | 11 +++++++----
>>>  1 file changed, 7 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
>>> index 93c70e1591de8f..3ded54d2c9c6ad 100644
>>> --- a/drivers/nvme/host/multipath.c
>>> +++ b/drivers/nvme/host/multipath.c
>>> @@ -281,10 +281,13 @@ inline struct nvme_ns *nvme_find_path(struct nvme_ns_head *head)
>>>  	struct nvme_ns *ns;
>>>  
>>>  	ns = srcu_dereference(head->current_path[node], &head->srcu);
>>> -	if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR && ns)
>>> -		ns = nvme_round_robin_path(head, node, ns);
>>> -	if (unlikely(!ns || !nvme_path_is_optimized(ns)))
>>> -		ns = __nvme_find_path(head, node);
>>> +	if (unlikely(!ns))
>>> +		return __nvme_find_path(head, node);
>>> +
>>> +	if (READ_ONCE(head->subsys->iopolicy) == NVME_IOPOLICY_RR)
>>> +		return nvme_round_robin_path(head, node, ns);
>>> +	if (unlikely(!nvme_path_is_optimized(ns)))
>>> +		return __nvme_find_path(head, node);
>>>  	return ns;
>>>  }
>>>  
>>>
>>
>> Yes, that would work, too.
>>
>> Should I resend?
> 
> No need, I can apply it with the modification.   But if you have a
> RR test setup it would be great to run it through that again, just in
> case.
> 
I'm at it.

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 0/2] nvme-multipath: fixes for non-optimized paths

[Christoph Hellwig]

Applied to nvme-5.9 with the tweak discussed earlier.

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