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net: sched: don't dump chains only held by actions

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In case a chain is empty and not explicitly created by a user,
such chain should not exist. The only exception is if there is
an action "goto chain" pointing to it. In that case, don't show the
chain in the dump. Track the chain references held by actions and
use them to find out if a chain should or should not be shown
in chain dump.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko
2018-07-27 09:45:05 +02:00
committed by David S. Miller
parent 7a49d3d4ea
commit 1f3ed383fb
4 changed files with 64 additions and 14 deletions
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3
include/net/pkt_cls.h
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@@ -39,7 +39,10 @@ bool tcf_queue_work(struct rcu_work *rwork, work_func_t func);
#ifdef CONFIG_NET_CLS
struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
bool create);
struct tcf_chain *tcf_chain_get_by_act(struct tcf_block *block,
u32 chain_index);
void tcf_chain_put(struct tcf_chain *chain);
void tcf_chain_put_by_act(struct tcf_chain *chain);
void tcf_block_netif_keep_dst(struct tcf_block *block);
int tcf_block_get(struct tcf_block **p_block,
struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,