netdev - Re: [PATCH 1/7] fix hnode refcounting

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Date:   Fri, 7 Sep 2018 08:33:52 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Al Viro <viro@...IV.linux.org.uk>
Cc:     netdev@...r.kernel.org, Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>, stable@...r.kernel.org
Subject: Re: [PATCH 1/7] fix hnode refcounting

To clarify with an example i used to test
your patches:

#0 add ingress filter
$TC qdisc add dev $P ingress
#1 add filter
$TC filter add dev $P parent ffff: protocol ip prio 10 \
u32 match ip protocol 1 0xff
#2 display
$TC filter ls dev $P parent ffff:

#3 try to delete root
$TC filter delete dev $P parent ffff: protocol ip prio 10 \
handle 800: u32

#4 nothing changes..
$TC filter ls dev $P parent ffff:
#5 delete filter
$TC filter delete dev $P parent ffff: protocol ip prio 10 \
handle 800:0:800 u32
#6 filter gone but hash table still there..
$TC filter ls dev $P parent ffff:
#7 delete tp
$TC filter delete dev $P parent ffff: protocol ip prio 10 \
u32
#8 now it is gone..
$TC filter ls dev $P parent ffff:

your patches show #6 filter as still active.
We want it to look like #8

Hope this helps.

cheers,
jamal