netdev - Re: [PATCH net] net: drop secpath extension before skb deferral free

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Date: Thu, 23 May 2024 08:44:56 +0200
From: Steffen Klassert <steffen.klassert@...unet.com>
To: Jianbo Liu <jianbol@...dia.com>
CC: Leon Romanovsky <leonro@...dia.com>, "edumazet@...gle.com"
	<edumazet@...gle.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"fw@...len.de" <fw@...len.de>
Subject: Re: [PATCH net] net: drop secpath extension before skb deferral free

On Thu, May 23, 2024 at 02:22:38AM +0000, Jianbo Liu wrote:
> On Wed, 2024-05-22 at 11:34 +0200, Steffen Klassert wrote:
> > 
> > Maybe we should directly remove the device from the xfrm_state
> > when the decice goes down, this should catch all the cases.
> > 
> > I think about something like this (untested) patch:
> > 
> > diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
> > index 0c306473a79d..ba402275ab57 100644
> > --- a/net/xfrm/xfrm_state.c
> > +++ b/net/xfrm/xfrm_state.c
> > @@ -867,7 +867,11 @@ int xfrm_dev_state_flush(struct net *net, struct
> > net_device *dev, bool task_vali
> >                                 xfrm_state_hold(x);
> >                                 spin_unlock_bh(&net-
> > >xfrm.xfrm_state_lock);
> >  
> > -                               err = xfrm_state_delete(x);
> > +                               spin_lock_bh(&x->lock);
> > +                               err = __xfrm_state_delete(x);
> > +                               xfrm_dev_state_free(x);
> > +                               spin_unlock_bh(&x->lock);
> > +
> >                                 xfrm_audit_state_delete(x, err ? 0 :
> > 1,
> >                                                         task_valid);
> >                                 xfrm_state_put(x);
> > 
> > The secpath is still attached to all skbs, but the hang on device
> > unregister should go away.
> 
> It didn't fix the issue.

Do you have a backtrace of the ref_tracker?

Is that with packet offload?

Looks like we need to remove the device from the xfrm_policy
too if packet offload is used.