[PATCH 4.4-only] openvswitch: clear sender cpu before forwarding packets

[PATCH 4.4-only] openvswitch: clear sender cpu before forwarding packets

[Anoob Soman]

Similar to commit c29390c6dfee ("xps: must clear sender_cpu before
forwarding") the skb->sender_cpu needs to be cleared before forwarding
packets.

Fixes: 2bd82484bb4c ("xps: fix xps for stacked devices")
Signed-off-by: Anoob Soman <anoob.soman@citrix.com>
---
 net/openvswitch/vport.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c
index 31cbc8c..a4887e7 100644
--- a/net/openvswitch/vport.c
+++ b/net/openvswitch/vport.c
@@ -503,6 +503,7 @@ void ovs_vport_send(struct vport *vport, struct sk_buff *skb)
 	}
 
 	skb->dev = vport->dev;
+	skb_sender_cpu_clear(skb);
 	vport->ops->send(skb);
 	return;
 
-- 
1.8.3.1

Re: [PATCH 4.4-only] openvswitch: clear sender cpu before forwarding packets

[Joe Stringer]

On 16 May 2017 at 07:25, Anoob Soman <anoob.soman@citrix.com> wrote:
> Similar to commit c29390c6dfee ("xps: must clear sender_cpu before
> forwarding") the skb->sender_cpu needs to be cleared before forwarding
> packets.
>
> Fixes: 2bd82484bb4c ("xps: fix xps for stacked devices")
> Signed-off-by: Anoob Soman <anoob.soman@citrix.com>

Is this needed for 4.1 too?

Re: [PATCH 4.4-only] openvswitch: clear sender cpu before forwarding packets

[Greg KH]

On Tue, May 16, 2017 at 03:25:10PM +0100, Anoob Soman wrote:
> Similar to commit c29390c6dfee ("xps: must clear sender_cpu before
> forwarding") the skb->sender_cpu needs to be cleared before forwarding
> packets.
> 
> Fixes: 2bd82484bb4c ("xps: fix xps for stacked devices")
> Signed-off-by: Anoob Soman <anoob.soman-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org>
> ---
>  net/openvswitch/vport.c | 1 +
>  1 file changed, 1 insertion(+)

Why is this a non-upstream patch?  What commit in Linus's tree fixed
this?  Why not just backport that?

thanks,

greg k-h

Re: [PATCH 4.4-only] openvswitch: clear sender cpu before forwarding packets

[Anoob Soman]

On 17/05/17 09:19, Greg KH wrote:
> Why is this a non-upstream patch?  What commit in Linus's tree fixed
> this?  Why not just backport that?
>
> thanks,
>
> greg k-h

Agreed, I think it is sensible to backport 52bd2d62ce67 "net: better 
skb->sender_cpu and skb->napi_id cohabitation" to 4.4, rather than 
having a different patch.

I think backport might be required for 4.1 as well, but I haven't checked.

-Anoob.

Re: [PATCH 4.4-only] openvswitch: clear sender cpu before forwarding packets

[Greg KH]

On Wed, May 17, 2017 at 10:21:09AM +0100, Anoob Soman wrote:
> On 17/05/17 09:19, Greg KH wrote:
> > Why is this a non-upstream patch?  What commit in Linus's tree fixed
> > this?  Why not just backport that?
> > 
> > thanks,
> > 
> > greg k-h
> 
> Agreed, I think it is sensible to backport 52bd2d62ce67 "net: better
> skb->sender_cpu and skb->napi_id cohabitation" to 4.4, rather than having a
> different patch.

So backporting that one patch solves the issue here?  Can you please
verify it, and let me know before I apply it?

thanks,

greg k-h

Re: [PATCH 4.4-only] openvswitch: clear sender cpu before forwarding packets

[Anoob Soman]

On 18/05/17 09:11, Greg KH wrote:
> So backporting that one patch solves the issue here?  Can you please
> verify it, and let me know before I apply it?
>
> thanks,
>
> greg k-h

yes, I can do that.

Re: [PATCH 4.4-only] openvswitch: clear sender cpu before forwarding packets

[kbuild test robot]

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Hi Anoob,

[auto build test ERROR on v4.9-rc8]
[also build test ERROR on next-20170519]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Anoob-Soman/openvswitch-clear-sender-cpu-before-forwarding-packets/20170519-111009
config: x86_64-rhel (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   net/openvswitch/vport.c: In function 'ovs_vport_send':
>> net/openvswitch/vport.c:513:2: error: implicit declaration of function 'skb_sender_cpu_clear' [-Werror=implicit-function-declaration]
     skb_sender_cpu_clear(skb);
     ^~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/skb_sender_cpu_clear +513 net/openvswitch/vport.c

   507					     packet_length(skb), mtu);
   508			vport->dev->stats.tx_errors++;
   509			goto drop;
   510		}
   511	
   512		skb->dev = vport->dev;
 > 513		skb_sender_cpu_clear(skb);
   514		vport->ops->send(skb);
   515		return;
   516	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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