netdev - [Patch net-next] act_mirred: use tcfm_dev in tcf_mirred_get

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Message-Id: <20171130225335.6957-1-xiyou.wangcong@gmail.com>
Date:   Thu, 30 Nov 2017 14:53:32 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     netdev@...r.kernel.org
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Jamal Hadi Salim <jhs@...atatu.com>
Subject: [Patch net-next] act_mirred: use tcfm_dev in tcf_mirred_get_dev()

tcfm_dev always points to the correct netdev and we already
hold a refcnt, so no need to use ifindex to lookup again.

If we would support moving target netdev across netns, using
pointer would be better than ifindex.

Cc: Jiri Pirko <jiri@...lanox.com>
Cc: Jamal Hadi Salim <jhs@...atatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
---
 include/net/tc_act/tc_mirred.h | 1 -
 net/sched/act_mirred.c         | 3 +--
 2 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/include/net/tc_act/tc_mirred.h b/include/net/tc_act/tc_mirred.h
index 21d253c9a8c6..b2dbbfaefd22 100644
--- a/include/net/tc_act/tc_mirred.h
+++ b/include/net/tc_act/tc_mirred.h
@@ -11,7 +11,6 @@ struct tcf_mirred {
 	int			tcfm_ifindex;
 	bool			tcfm_mac_header_xmit;
 	struct net_device __rcu	*tcfm_dev;
-	struct net		*net;
 	struct list_head	tcfm_list;
 };
 #define to_mirred(a) ((struct tcf_mirred *)a)
diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
index 8b3e59388480..fe6489f9c3cf 100644
--- a/net/sched/act_mirred.c
+++ b/net/sched/act_mirred.c
@@ -140,7 +140,6 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
 	m->tcfm_eaction = parm->eaction;
 	if (dev != NULL) {
 		m->tcfm_ifindex = parm->ifindex;
-		m->net = net;
 		if (ret != ACT_P_CREATED)
 			dev_put(rcu_dereference_protected(m->tcfm_dev, 1));
 		dev_hold(dev);
@@ -318,7 +317,7 @@ static struct net_device *tcf_mirred_get_dev(const struct tc_action *a)
 {
 	struct tcf_mirred *m = to_mirred(a);
 
-	return __dev_get_by_index(m->net, m->tcfm_ifindex);
+	return rtnl_dereference(m->tcfm_dev);
 }
 
 static struct tc_action_ops act_mirred_ops = {
-- 
2.13.0