netdev - Re: tc rsvp filter show broke

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Message-ID: <CAM_iQpVF8bHN8WNNH5kHyanj+fLE6kbsFOwQA+t_z_=UK_v=+w@mail.gmail.com>
Date:	Sun, 28 Sep 2014 18:40:11 -0700
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	John Fastabend <john.fastabend@...il.com>
Cc:	Jamal Hadi Salim <jhs@...atatu.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: tc rsvp filter show broke

On Sun, Sep 28, 2014 at 10:50 AM, John Fastabend
<john.fastabend@...il.com> wrote:
>
>
> I don't think we need this change, (or perhaps it needs to be a bit
> more complete if something is missing) take a look a
> tcf_exts_validate(), notice the policer is added to act->list so the
> if block in dump() work out,

I thought it's clear that act->list is correct here. :)

I was thinking the dump logic was wrong, but you are right that
it should match the logic in validate. Actually the bug is we forgot
to copy exts->type, I am going to submit a patch below:

diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 77147c8..aad6a67 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -549,6 +549,7 @@ void tcf_exts_change(struct tcf_proto *tp, struct
tcf_exts *dst,
  tcf_tree_lock(tp);
  list_splice_init(&dst->actions, &tmp);
  list_splice(&src->actions, &dst->actions);
+ dst->type = src->type;
  tcf_tree_unlock(tp);
  tcf_action_destroy(&tmp, TCA_ACT_UNBIND);
 #endif
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