[PATCH net 0/2] cls_u32 hardware offload fixes

[PATCH net 0/2] cls_u32 hardware offload fixes

[Jakub Kicinski]

Hi!

This set fixes two small issues with error codes I noticed
in cls_u32.  Second patch could be viewed as user space API
change but that portion of API is not part of any release,
yet.

Compile tested only.

Jakub Kicinski (2):
  net: cls_u32: fix error code for invalid flags
  net: cls_u32: be more strict about skip-sw flag

 net/sched/cls_u32.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

-- 
1.9.1

[PATCH net 1/2] net: cls_u32: fix error code for invalid flags

[Jakub Kicinski]

'err' variable is not set in this test, we would return whatever
previous test set 'err' to.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
---
 net/sched/cls_u32.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index 079b43b3c5d2..b17e090f2fe1 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -863,7 +863,7 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
 	if (tb[TCA_U32_FLAGS]) {
 		flags = nla_get_u32(tb[TCA_U32_FLAGS]);
 		if (!tc_flags_valid(flags))
-			return err;
+			return -EINVAL;
 	}
 
 	n = (struct tc_u_knode *)*arg;
-- 
1.9.1

[PATCH net 2/2] net: cls_u32: be more strict about skip-sw flag

[Jakub Kicinski]

Return an error if user requested skip-sw and the underlaying
hardware cannot handle tc offloads (or offloads are disabled).

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
---
 net/sched/cls_u32.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index b17e090f2fe1..fe05449537a3 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -457,20 +457,21 @@ static int u32_replace_hw_hnode(struct tcf_proto *tp,
 	struct tc_to_netdev offload;
 	int err;
 
+	if (!tc_should_offload(dev, flags))
+		return tc_skip_sw(flags) ? -EINVAL : 0;
+
 	offload.type = TC_SETUP_CLSU32;
 	offload.cls_u32 = &u32_offload;
 
-	if (tc_should_offload(dev, flags)) {
-		offload.cls_u32->command = TC_CLSU32_NEW_HNODE;
-		offload.cls_u32->hnode.divisor = h->divisor;
-		offload.cls_u32->hnode.handle = h->handle;
-		offload.cls_u32->hnode.prio = h->prio;
+	offload.cls_u32->command = TC_CLSU32_NEW_HNODE;
+	offload.cls_u32->hnode.divisor = h->divisor;
+	offload.cls_u32->hnode.handle = h->handle;
+	offload.cls_u32->hnode.prio = h->prio;
 
-		err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
-						    tp->protocol, &offload);
-		if (tc_skip_sw(flags))
-			return err;
-	}
+	err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
+					    tp->protocol, &offload);
+	if (tc_skip_sw(flags))
+		return err;
 
 	return 0;
 }
-- 
1.9.1

Re: [PATCH net 1/2] net: cls_u32: fix error code for invalid flags

[Samudrala, Sridhar]

On 6/6/2016 8:16 AM, Jakub Kicinski wrote:
> 'err' variable is not set in this test, we would return whatever
> previous test set 'err' to.
>
> Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>

Acked-by: Sridhar Samudrala <sridhar.samudrala@intel.com>

> ---
>   net/sched/cls_u32.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
> index 079b43b3c5d2..b17e090f2fe1 100644
> --- a/net/sched/cls_u32.c
> +++ b/net/sched/cls_u32.c
> @@ -863,7 +863,7 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
>   	if (tb[TCA_U32_FLAGS]) {
>   		flags = nla_get_u32(tb[TCA_U32_FLAGS]);
>   		if (!tc_flags_valid(flags))
> -			return err;
> +			return -EINVAL;
>   	}
>   
>   	n = (struct tc_u_knode *)*arg;

Re: [PATCH net 2/2] net: cls_u32: be more strict about skip-sw flag

[Samudrala, Sridhar]

On 6/6/2016 8:16 AM, Jakub Kicinski wrote:
> Return an error if user requested skip-sw and the underlaying
> hardware cannot handle tc offloads (or offloads are disabled).
>
> Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>

looks good. I think we need similar checks in u32_replace_hw_knode() too.


> ---
>   net/sched/cls_u32.c | 21 +++++++++++----------
>   1 file changed, 11 insertions(+), 10 deletions(-)
>
> diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
> index b17e090f2fe1..fe05449537a3 100644
> --- a/net/sched/cls_u32.c
> +++ b/net/sched/cls_u32.c
> @@ -457,20 +457,21 @@ static int u32_replace_hw_hnode(struct tcf_proto *tp,
>   	struct tc_to_netdev offload;
>   	int err;
>   
> +	if (!tc_should_offload(dev, flags))
> +		return tc_skip_sw(flags) ? -EINVAL : 0;
> +
>   	offload.type = TC_SETUP_CLSU32;
>   	offload.cls_u32 = &u32_offload;
>   
> -	if (tc_should_offload(dev, flags)) {
> -		offload.cls_u32->command = TC_CLSU32_NEW_HNODE;
> -		offload.cls_u32->hnode.divisor = h->divisor;
> -		offload.cls_u32->hnode.handle = h->handle;
> -		offload.cls_u32->hnode.prio = h->prio;
> +	offload.cls_u32->command = TC_CLSU32_NEW_HNODE;
> +	offload.cls_u32->hnode.divisor = h->divisor;
> +	offload.cls_u32->hnode.handle = h->handle;
> +	offload.cls_u32->hnode.prio = h->prio;
>   
> -		err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
> -						    tp->protocol, &offload);
> -		if (tc_skip_sw(flags))
> -			return err;
> -	}
> +	err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
> +					    tp->protocol, &offload);
> +	if (tc_skip_sw(flags))
> +		return err;
>   
>   	return 0;
>   }

[PATCHv2 net 0/2] cls_u32 hardware offload fixes

[Jakub Kicinski]

Hi!

This set fixes two small issues with error codes I noticed
in cls_u32.  Second patch could be viewed as user space API
change but that portion of API is not part of any release,
yet.

Compile tested only.

Jakub Kicinski (2):
  net: cls_u32: fix error code for invalid flags
  net: cls_u32: be more strict about skip-sw flag

 net/sched/cls_u32.c | 60 +++++++++++++++++++++++++++--------------------------
 1 file changed, 31 insertions(+), 29 deletions(-)

-- 
1.9.1

[PATCHv2 net 1/2] net: cls_u32: fix error code for invalid flags

[Jakub Kicinski]

'err' variable is not set in this test, we would return whatever
previous test set 'err' to.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dinan Gunawardena <dinan.gunawardena@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Acked-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
---
 net/sched/cls_u32.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index 079b43b3c5d2..b17e090f2fe1 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -863,7 +863,7 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
 	if (tb[TCA_U32_FLAGS]) {
 		flags = nla_get_u32(tb[TCA_U32_FLAGS]);
 		if (!tc_flags_valid(flags))
-			return err;
+			return -EINVAL;
 	}
 
 	n = (struct tc_u_knode *)*arg;
-- 
1.9.1

[PATCHv2 net 2/2] net: cls_u32: be more strict about skip-sw flag

[Jakub Kicinski]

Return an error if user requested skip-sw and the underlaying
hardware cannot handle tc offloads (or offloads are disabled).

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dinan Gunawardena <dgunawardena@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
---
v2:
  - handle both knode and hnodes
---
 net/sched/cls_u32.c | 58 +++++++++++++++++++++++++++--------------------------
 1 file changed, 30 insertions(+), 28 deletions(-)

diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index b17e090f2fe1..0fc1d47885f8 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -457,20 +457,21 @@ static int u32_replace_hw_hnode(struct tcf_proto *tp,
 	struct tc_to_netdev offload;
 	int err;
 
+	if (!tc_should_offload(dev, flags))
+		return tc_skip_sw(flags) ? -EINVAL : 0;
+
 	offload.type = TC_SETUP_CLSU32;
 	offload.cls_u32 = &u32_offload;
 
-	if (tc_should_offload(dev, flags)) {
-		offload.cls_u32->command = TC_CLSU32_NEW_HNODE;
-		offload.cls_u32->hnode.divisor = h->divisor;
-		offload.cls_u32->hnode.handle = h->handle;
-		offload.cls_u32->hnode.prio = h->prio;
+	offload.cls_u32->command = TC_CLSU32_NEW_HNODE;
+	offload.cls_u32->hnode.divisor = h->divisor;
+	offload.cls_u32->hnode.handle = h->handle;
+	offload.cls_u32->hnode.prio = h->prio;
 
-		err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
-						    tp->protocol, &offload);
-		if (tc_skip_sw(flags))
-			return err;
-	}
+	err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
+					    tp->protocol, &offload);
+	if (tc_skip_sw(flags))
+		return err;
 
 	return 0;
 }
@@ -507,27 +508,28 @@ static int u32_replace_hw_knode(struct tcf_proto *tp,
 	offload.type = TC_SETUP_CLSU32;
 	offload.cls_u32 = &u32_offload;
 
-	if (tc_should_offload(dev, flags)) {
-		offload.cls_u32->command = TC_CLSU32_REPLACE_KNODE;
-		offload.cls_u32->knode.handle = n->handle;
-		offload.cls_u32->knode.fshift = n->fshift;
+	if (!tc_should_offload(dev, flags))
+		return tc_skip_sw(flags) ? -EINVAL : 0;
+
+	offload.cls_u32->command = TC_CLSU32_REPLACE_KNODE;
+	offload.cls_u32->knode.handle = n->handle;
+	offload.cls_u32->knode.fshift = n->fshift;
 #ifdef CONFIG_CLS_U32_MARK
-		offload.cls_u32->knode.val = n->val;
-		offload.cls_u32->knode.mask = n->mask;
+	offload.cls_u32->knode.val = n->val;
+	offload.cls_u32->knode.mask = n->mask;
 #else
-		offload.cls_u32->knode.val = 0;
-		offload.cls_u32->knode.mask = 0;
+	offload.cls_u32->knode.val = 0;
+	offload.cls_u32->knode.mask = 0;
 #endif
-		offload.cls_u32->knode.sel = &n->sel;
-		offload.cls_u32->knode.exts = &n->exts;
-		if (n->ht_down)
-			offload.cls_u32->knode.link_handle = n->ht_down->handle;
-
-		err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
-						    tp->protocol, &offload);
-		if (tc_skip_sw(flags))
-			return err;
-	}
+	offload.cls_u32->knode.sel = &n->sel;
+	offload.cls_u32->knode.exts = &n->exts;
+	if (n->ht_down)
+		offload.cls_u32->knode.link_handle = n->ht_down->handle;
+
+	err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
+					    tp->protocol, &offload);
+	if (tc_skip_sw(flags))
+		return err;
 
 	return 0;
 }
-- 
1.9.1

Re: [PATCH net 1/2] net: cls_u32: fix error code for invalid flags

[John Fastabend]

On 16-06-06 08:16 AM, Jakub Kicinski wrote:
> 'err' variable is not set in this test, we would return whatever
> previous test set 'err' to.
> 
> Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
> ---
>  net/sched/cls_u32.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
> index 079b43b3c5d2..b17e090f2fe1 100644
> --- a/net/sched/cls_u32.c
> +++ b/net/sched/cls_u32.c
> @@ -863,7 +863,7 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
>  	if (tb[TCA_U32_FLAGS]) {
>  		flags = nla_get_u32(tb[TCA_U32_FLAGS]);
>  		if (!tc_flags_valid(flags))
> -			return err;
> +			return -EINVAL;
>  	}
>  
>  	n = (struct tc_u_knode *)*arg;
> 

Yep, I agree it is nice to get an error on this case.

Acked-by: John Fastabend <john.r.fastabend@intel.com>

Re: [PATCHv2 net 1/2] net: cls_u32: fix error code for invalid flags

[John Fastabend]

On 16-06-07 03:46 AM, Jakub Kicinski wrote:
> 'err' variable is not set in this test, we would return whatever
> previous test set 'err' to.
> 
> Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
> Reviewed-by: Dinan Gunawardena <dinan.gunawardena@netronome.com>
> Reviewed-by: Simon Horman <simon.horman@netronome.com>
> Acked-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
> ---
>  net/sched/cls_u32.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
> index 079b43b3c5d2..b17e090f2fe1 100644
> --- a/net/sched/cls_u32.c
> +++ b/net/sched/cls_u32.c
> @@ -863,7 +863,7 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
>  	if (tb[TCA_U32_FLAGS]) {
>  		flags = nla_get_u32(tb[TCA_U32_FLAGS]);
>  		if (!tc_flags_valid(flags))
> -			return err;
> +			return -EINVAL;
>  	}
>  
>  	n = (struct tc_u_knode *)*arg;
> 

Acking the v2 now -- seems nice to throw an error in this case.

Acked-by: John Fastabend <john.r.fastabend@intel.com>

Re: [PATCHv2 net 2/2] net: cls_u32: be more strict about skip-sw flag

[John Fastabend]

On 16-06-07 03:46 AM, Jakub Kicinski wrote:
> Return an error if user requested skip-sw and the underlaying
> hardware cannot handle tc offloads (or offloads are disabled).
> 
> Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
> Reviewed-by: Dinan Gunawardena <dgunawardena@netronome.com>
> Reviewed-by: Simon Horman <simon.horman@netronome.com>
> ---
> v2:
>   - handle both knode and hnodes
> ---
>  net/sched/cls_u32.c | 58 +++++++++++++++++++++++++++--------------------------
>  1 file changed, 30 insertions(+), 28 deletions(-)
> 
> diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
> index b17e090f2fe1..0fc1d47885f8 100644
> --- a/net/sched/cls_u32.c
> +++ b/net/sched/cls_u32.c
> @@ -457,20 +457,21 @@ static int u32_replace_hw_hnode(struct tcf_proto *tp,
>  	struct tc_to_netdev offload;
>  	int err;
>  
> +	if (!tc_should_offload(dev, flags))
> +		return tc_skip_sw(flags) ? -EINVAL : 0;
> +
>  	offload.type = TC_SETUP_CLSU32;
>  	offload.cls_u32 = &u32_offload;
>  
> -	if (tc_should_offload(dev, flags)) {
> -		offload.cls_u32->command = TC_CLSU32_NEW_HNODE;
> -		offload.cls_u32->hnode.divisor = h->divisor;
> -		offload.cls_u32->hnode.handle = h->handle;
> -		offload.cls_u32->hnode.prio = h->prio;
> +	offload.cls_u32->command = TC_CLSU32_NEW_HNODE;
> +	offload.cls_u32->hnode.divisor = h->divisor;
> +	offload.cls_u32->hnode.handle = h->handle;
> +	offload.cls_u32->hnode.prio = h->prio;
>  
> -		err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
> -						    tp->protocol, &offload);
> -		if (tc_skip_sw(flags))
> -			return err;
> -	}
> +	err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
> +					    tp->protocol, &offload);
> +	if (tc_skip_sw(flags))
> +		return err;
>  
>  	return 0;
>  }

Looks like we also need to catch the error at u32_replace_hw_hnode call
sites?


                u32_replace_hw_hnode(tp, ht, flags);
                return 0;
        }

should be

		return replace_hw_hnode(tp, ht,flags)


Thanks,
John

Re: [PATCHv2 net 2/2] net: cls_u32: be more strict about skip-sw flag

[Jakub Kicinski]

On Tue, 7 Jun 2016 08:53:35 -0700, John Fastabend wrote:
> On 16-06-07 03:46 AM, Jakub Kicinski wrote:
> > Return an error if user requested skip-sw and the underlaying
> > hardware cannot handle tc offloads (or offloads are disabled).
> > 
> > Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
> > Reviewed-by: Dinan Gunawardena <dgunawardena@netronome.com>
> > Reviewed-by: Simon Horman <simon.horman@netronome.com>
> > ---
> > v2:
> >   - handle both knode and hnodes
> > ---
> >  net/sched/cls_u32.c | 58 +++++++++++++++++++++++++++--------------------------
> >  1 file changed, 30 insertions(+), 28 deletions(-)
> > 
> > diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
> > index b17e090f2fe1..0fc1d47885f8 100644
> > --- a/net/sched/cls_u32.c
> > +++ b/net/sched/cls_u32.c
> > @@ -457,20 +457,21 @@ static int u32_replace_hw_hnode(struct tcf_proto *tp,
> >  	struct tc_to_netdev offload;
> >  	int err;
> >  
> > +	if (!tc_should_offload(dev, flags))
> > +		return tc_skip_sw(flags) ? -EINVAL : 0;
> > +
> >  	offload.type = TC_SETUP_CLSU32;
> >  	offload.cls_u32 = &u32_offload;
> >  
> > -	if (tc_should_offload(dev, flags)) {
> > -		offload.cls_u32->command = TC_CLSU32_NEW_HNODE;
> > -		offload.cls_u32->hnode.divisor = h->divisor;
> > -		offload.cls_u32->hnode.handle = h->handle;
> > -		offload.cls_u32->hnode.prio = h->prio;
> > +	offload.cls_u32->command = TC_CLSU32_NEW_HNODE;
> > +	offload.cls_u32->hnode.divisor = h->divisor;
> > +	offload.cls_u32->hnode.handle = h->handle;
> > +	offload.cls_u32->hnode.prio = h->prio;
> >  
> > -		err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
> > -						    tp->protocol, &offload);
> > -		if (tc_skip_sw(flags))
> > -			return err;
> > -	}
> > +	err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
> > +					    tp->protocol, &offload);
> > +	if (tc_skip_sw(flags))
> > +		return err;
> >  
> >  	return 0;
> >  }  
> 
> Looks like we also need to catch the error at u32_replace_hw_hnode call
> sites?
> 
> 
>                 u32_replace_hw_hnode(tp, ht, flags);
>                 return 0;
>         }
> 
> should be
> 
> 		return replace_hw_hnode(tp, ht,flags)

Indeed. I'll add a third patch to the series, seems like a separate bug.

[PATCHv3 net 0/3] cls_u32 hardware offload fixes

[Jakub Kicinski]

Hi!

This set fixes three small issues with error codes I noticed
in cls_u32.  Second patch could be viewed as user space API
change but that portion of API is not part of any release,
yet.

Very lightly tested.

Jakub Kicinski (3):
  net: cls_u32: fix error code for invalid flags
  net: cls_u32: be more strict about skip-sw flag
  net: cls_u32: catch all hardware offload errors

 net/sched/cls_u32.c | 68 ++++++++++++++++++++++++++++++-----------------------
 1 file changed, 38 insertions(+), 30 deletions(-)

-- 
1.9.1

[PATCHv3 net 1/3] net: cls_u32: fix error code for invalid flags

[Jakub Kicinski]

'err' variable is not set in this test, we would return whatever
previous test set 'err' to.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dinan Gunawardena <dinan.gunawardena@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Acked-by: Sridhar Samudrala <sridhar.samudrala@intel.com>
Acked-by: John Fastabend <john.r.fastabend@intel.com>
---
 net/sched/cls_u32.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index 079b43b3c5d2..b17e090f2fe1 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -863,7 +863,7 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
 	if (tb[TCA_U32_FLAGS]) {
 		flags = nla_get_u32(tb[TCA_U32_FLAGS]);
 		if (!tc_flags_valid(flags))
-			return err;
+			return -EINVAL;
 	}
 
 	n = (struct tc_u_knode *)*arg;
-- 
1.9.1

[PATCHv3 net 2/3] net: cls_u32: be more strict about skip-sw flag

[Jakub Kicinski]

Return an error if user requested skip-sw and the underlaying
hardware cannot handle tc offloads (or offloads are disabled).

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dinan Gunawardena <dgunawardena@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
---
v2:
  - handle both knode and hnodes
---
 net/sched/cls_u32.c | 58 +++++++++++++++++++++++++++--------------------------
 1 file changed, 30 insertions(+), 28 deletions(-)

diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index b17e090f2fe1..0fc1d47885f8 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -457,20 +457,21 @@ static int u32_replace_hw_hnode(struct tcf_proto *tp,
 	struct tc_to_netdev offload;
 	int err;
 
+	if (!tc_should_offload(dev, flags))
+		return tc_skip_sw(flags) ? -EINVAL : 0;
+
 	offload.type = TC_SETUP_CLSU32;
 	offload.cls_u32 = &u32_offload;
 
-	if (tc_should_offload(dev, flags)) {
-		offload.cls_u32->command = TC_CLSU32_NEW_HNODE;
-		offload.cls_u32->hnode.divisor = h->divisor;
-		offload.cls_u32->hnode.handle = h->handle;
-		offload.cls_u32->hnode.prio = h->prio;
+	offload.cls_u32->command = TC_CLSU32_NEW_HNODE;
+	offload.cls_u32->hnode.divisor = h->divisor;
+	offload.cls_u32->hnode.handle = h->handle;
+	offload.cls_u32->hnode.prio = h->prio;
 
-		err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
-						    tp->protocol, &offload);
-		if (tc_skip_sw(flags))
-			return err;
-	}
+	err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
+					    tp->protocol, &offload);
+	if (tc_skip_sw(flags))
+		return err;
 
 	return 0;
 }
@@ -507,27 +508,28 @@ static int u32_replace_hw_knode(struct tcf_proto *tp,
 	offload.type = TC_SETUP_CLSU32;
 	offload.cls_u32 = &u32_offload;
 
-	if (tc_should_offload(dev, flags)) {
-		offload.cls_u32->command = TC_CLSU32_REPLACE_KNODE;
-		offload.cls_u32->knode.handle = n->handle;
-		offload.cls_u32->knode.fshift = n->fshift;
+	if (!tc_should_offload(dev, flags))
+		return tc_skip_sw(flags) ? -EINVAL : 0;
+
+	offload.cls_u32->command = TC_CLSU32_REPLACE_KNODE;
+	offload.cls_u32->knode.handle = n->handle;
+	offload.cls_u32->knode.fshift = n->fshift;
 #ifdef CONFIG_CLS_U32_MARK
-		offload.cls_u32->knode.val = n->val;
-		offload.cls_u32->knode.mask = n->mask;
+	offload.cls_u32->knode.val = n->val;
+	offload.cls_u32->knode.mask = n->mask;
 #else
-		offload.cls_u32->knode.val = 0;
-		offload.cls_u32->knode.mask = 0;
+	offload.cls_u32->knode.val = 0;
+	offload.cls_u32->knode.mask = 0;
 #endif
-		offload.cls_u32->knode.sel = &n->sel;
-		offload.cls_u32->knode.exts = &n->exts;
-		if (n->ht_down)
-			offload.cls_u32->knode.link_handle = n->ht_down->handle;
-
-		err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
-						    tp->protocol, &offload);
-		if (tc_skip_sw(flags))
-			return err;
-	}
+	offload.cls_u32->knode.sel = &n->sel;
+	offload.cls_u32->knode.exts = &n->exts;
+	if (n->ht_down)
+		offload.cls_u32->knode.link_handle = n->ht_down->handle;
+
+	err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
+					    tp->protocol, &offload);
+	if (tc_skip_sw(flags))
+		return err;
 
 	return 0;
 }
-- 
1.9.1

[PATCHv3 net 3/3] net: cls_u32: catch all hardware offload errors

[Jakub Kicinski]

Errors reported by u32_replace_hw_hnode() were not propagated.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dinan Gunawardena <dgunawardena@netronome.com>
---
v3:
 - new patch

 net/sched/cls_u32.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index 0fc1d47885f8..b9c3875fddc6 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -923,11 +923,17 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
 		ht->divisor = divisor;
 		ht->handle = handle;
 		ht->prio = tp->prio;
+
+		err = u32_replace_hw_hnode(tp, ht, flags);
+		if (err) {
+			kfree(ht);
+			return err;
+		}
+
 		RCU_INIT_POINTER(ht->next, tp_c->hlist);
 		rcu_assign_pointer(tp_c->hlist, ht);
 		*arg = (unsigned long)ht;
 
-		u32_replace_hw_hnode(tp, ht, flags);
 		return 0;
 	}
 
-- 
1.9.1

Re: [PATCHv3 net 2/3] net: cls_u32: be more strict about skip-sw flag

[Samudrala, Sridhar]

On 6/7/2016 3:17 PM, Jakub Kicinski wrote:
> Return an error if user requested skip-sw and the underlaying
> hardware cannot handle tc offloads (or offloads are disabled).
>
> Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
> Reviewed-by: Dinan Gunawardena <dgunawardena@netronome.com>
> Reviewed-by: Simon Horman <simon.horman@netronome.com>
> ---
> v2:
>    - handle both knode and hnodes
> ---

Acked-by: Sridhar Samudrala <sridhar.samudrala@intel.com>

Re: [PATCHv3 net 3/3] net: cls_u32: catch all hardware offload errors

[Samudrala, Sridhar]

On 6/7/2016 3:17 PM, Jakub Kicinski wrote:
> Errors reported by u32_replace_hw_hnode() were not propagated.
>
> Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
> Reviewed-by: Dinan Gunawardena <dgunawardena@netronome.com>
> ---
> v3:
>   - new patch
Acked-by: Sridhar Samudrala <sridhar.samudrala@intel.com>

>
>   net/sched/cls_u32.c | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
> index 0fc1d47885f8..b9c3875fddc6 100644
> --- a/net/sched/cls_u32.c
> +++ b/net/sched/cls_u32.c
> @@ -923,11 +923,17 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
>   		ht->divisor = divisor;
>   		ht->handle = handle;
>   		ht->prio = tp->prio;
> +
> +		err = u32_replace_hw_hnode(tp, ht, flags);
> +		if (err) {
> +			kfree(ht);
> +			return err;
> +		}
> +
>   		RCU_INIT_POINTER(ht->next, tp_c->hlist);
>   		rcu_assign_pointer(tp_c->hlist, ht);
>   		*arg = (unsigned long)ht;
>   
> -		u32_replace_hw_hnode(tp, ht, flags);
>   		return 0;
>   	}
>   

Re: [PATCH net 0/2] cls_u32 hardware offload fixes

[David Miller]

From: Jakub Kicinski <jakub.kicinski@netronome.com>
Date: Mon,  6 Jun 2016 16:16:46 +0100

> This set fixes two small issues with error codes I noticed
> in cls_u32.  Second patch could be viewed as user space API
> change but that portion of API is not part of any release,
> yet.
> 
> Compile tested only.

Applied, thanks.

Re: [PATCH net 0/2] cls_u32 hardware offload fixes

[Jakub Kicinski]

On Tue, 07 Jun 2016 16:27:31 -0700 (PDT), David Miller wrote:
> From: Jakub Kicinski <jakub.kicinski@netronome.com>
> Date: Mon,  6 Jun 2016 16:16:46 +0100
> 
> > This set fixes two small issues with error codes I noticed
> > in cls_u32.  Second patch could be viewed as user space API
> > change but that portion of API is not part of any release,
> > yet.
> > 
> > Compile tested only.  
> 
> Applied, thanks.

I think you applied v1 instead of v3 (which is still in patchwork) :S
Should I post an incremental patch to bring the code to v3 state?

Re: [PATCH net 0/2] cls_u32 hardware offload fixes

[David Miller]

From: Jakub Kicinski <jakub.kicinski@netronome.com>
Date: Wed, 8 Jun 2016 11:18:30 +0100

> On Tue, 07 Jun 2016 16:27:31 -0700 (PDT), David Miller wrote:
>> From: Jakub Kicinski <jakub.kicinski@netronome.com>
>> Date: Mon,  6 Jun 2016 16:16:46 +0100
>> 
>> > This set fixes two small issues with error codes I noticed
>> > in cls_u32.  Second patch could be viewed as user space API
>> > change but that portion of API is not part of any release,
>> > yet.
>> > 
>> > Compile tested only.  
>> 
>> Applied, thanks.
> 
> I think you applied v1 instead of v3 (which is still in patchwork) :S
> Should I post an incremental patch to bring the code to v3 state?

Yeah please do, sorry about that :-/

Re: [PATCH net 0/2] cls_u32 hardware offload fixes

[Jakub Kicinski]

On Wed, 08 Jun 2016 11:09:36 -0700 (PDT), David Miller wrote:
> From: Jakub Kicinski <jakub.kicinski@netronome.com>
> Date: Wed, 8 Jun 2016 11:18:30 +0100
> 
> > On Tue, 07 Jun 2016 16:27:31 -0700 (PDT), David Miller wrote:  
> >> From: Jakub Kicinski <jakub.kicinski@netronome.com>
> >> Date: Mon,  6 Jun 2016 16:16:46 +0100
> >>   
> >> > This set fixes two small issues with error codes I noticed
> >> > in cls_u32.  Second patch could be viewed as user space API
> >> > change but that portion of API is not part of any release,
> >> > yet.
> >> > 
> >> > Compile tested only.    
> >> 
> >> Applied, thanks.  
> > 
> > I think you applied v1 instead of v3 (which is still in patchwork) :S
> > Should I post an incremental patch to bring the code to v3 state?  
> 
> Yeah please do, sorry about that :-/

Done and marked v3 as Superseded, hope that's OK!