netdev - Re: linux-next: manual merge of the net-next tree with the net tree

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Date:   Thu, 1 Dec 2016 08:56:20 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     David Miller <davem@...emloft.net>,
        Networking <netdev@...r.kernel.org>, linux-next@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jiri Pirko <jiri@...lanox.com>,
        Roi Dayan <roid@...lanox.com>
Subject: Re: linux-next: manual merge of the net-next tree with the net tree

Thu, Dec 01, 2016 at 02:41:59AM CET, sfr@...b.auug.org.au wrote:
>Hi all,
>
>Today's linux-next merge of the net-next tree got a conflict in:
>
>  net/sched/cls_flower.c
>
>between commit:
>
>  725cbb62e7ad ("sched: cls_flower: remove from hashtable only in case skip sw flag is not set")
>
>from the net tree and commit:
>
>  13fa876ebd03 ("net/sched: cls_flower: merge filter delete/destroy common code")
>
>from the net-next tree.
>
>I fixed it up (see below) and can carry the fix as necessary. This
>is now fixed as far as linux-next is concerned, but any non trivial
>conflicts should be mentioned to your upstream maintainer when your tree
>is submitted for merging.  You may also want to consider cooperating
>with the maintainer of the conflicting tree to minimise any particularly
>complex conflicts.

Looks fine to me. Thanks.

>
>-- 
>Cheers,
>Stephen Rothwell
>
>diff --cc net/sched/cls_flower.c
>index 904442421db3,e8dd09af0d0c..000000000000
>--- a/net/sched/cls_flower.c
>+++ b/net/sched/cls_flower.c
>@@@ -273,24 -272,14 +276,32 @@@ static void fl_hw_update_stats(struct t
>  	dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, &tc);
>  }
>  
> +static void fl_destroy_sleepable(struct work_struct *work)
> +{
> +	struct cls_fl_head *head = container_of(work, struct cls_fl_head,
> +						work);
> +	if (head->mask_assigned)
> +		rhashtable_destroy(&head->ht);
> +	kfree(head);
> +	module_put(THIS_MODULE);
> +}
> +
> +static void fl_destroy_rcu(struct rcu_head *rcu)
> +{
> +	struct cls_fl_head *head = container_of(rcu, struct cls_fl_head, rcu);
> +
> +	INIT_WORK(&head->work, fl_destroy_sleepable);
> +	schedule_work(&head->work);
> +}
> +
>+ static void __fl_delete(struct tcf_proto *tp, struct cls_fl_filter *f)
>+ {
>+ 	list_del_rcu(&f->list);
>+ 	fl_hw_destroy_filter(tp, (unsigned long)f);
>+ 	tcf_unbind_filter(tp, &f->res);
>+ 	call_rcu(&f->rcu, fl_destroy_filter);
>+ }
>+ 
>  static bool fl_destroy(struct tcf_proto *tp, bool force)
>  {
>  	struct cls_fl_head *head = rtnl_dereference(tp->root);
>@@@ -299,14 -288,12 +310,11 @@@
>  	if (!force && !list_empty(&head->filters))
>  		return false;
>  
>- 	list_for_each_entry_safe(f, next, &head->filters, list) {
>- 		fl_hw_destroy_filter(tp, (unsigned long)f);
>- 		list_del_rcu(&f->list);
>- 		call_rcu(&f->rcu, fl_destroy_filter);
>- 	}
>+ 	list_for_each_entry_safe(f, next, &head->filters, list)
>+ 		__fl_delete(tp, f);
> -	RCU_INIT_POINTER(tp->root, NULL);
> -	if (head->mask_assigned)
> -		rhashtable_destroy(&head->ht);
> -	kfree_rcu(head, rcu);
> +
> +	__module_get(THIS_MODULE);
> +	call_rcu(&head->rcu, fl_destroy_rcu);
>  	return true;
>  }
>  
>@@@ -761,13 -782,9 +804,10 @@@ static int fl_delete(struct tcf_proto *
>  	struct cls_fl_head *head = rtnl_dereference(tp->root);
>  	struct cls_fl_filter *f = (struct cls_fl_filter *) arg;
>  
> -	rhashtable_remove_fast(&head->ht, &f->ht_node,
> -			       head->ht_params);
> +	if (!tc_skip_sw(f->flags))
> +		rhashtable_remove_fast(&head->ht, &f->ht_node,
> +				       head->ht_params);
>- 	list_del_rcu(&f->list);
>- 	fl_hw_destroy_filter(tp, (unsigned long)f);
>- 	tcf_unbind_filter(tp, &f->res);
>- 	call_rcu(&f->rcu, fl_destroy_filter);
>+ 	__fl_delete(tp, f);
>  	return 0;
>  }
>