netdev - [PATCH net-next v8 4/5] net/sched: act_mirred: Add helper function tcf_mirred_replace

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Message-ID: <20231219181623.3845083-5-victor@mojatatu.com>
Date: Tue, 19 Dec 2023 15:16:22 -0300
From: Victor Nogueira <victor@...atatu.com>
To: jhs@...atatu.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	xiyou.wangcong@...il.com,
	jiri@...nulli.us
Cc: mleitner@...hat.com,
	vladbu@...dia.com,
	paulb@...dia.com,
	pctammela@...atatu.com,
	netdev@...r.kernel.org,
	kernel@...atatu.com
Subject: [PATCH net-next v8 4/5] net/sched: act_mirred: Add helper function tcf_mirred_replace_dev

The act of replacing a device will be repeated by the init logic for the
block ID in the patch that allows mirred to a block. Therefore we
encapsulate this functionality in a function (tcf_mirred_replace_dev) so
that we can reuse it and avoid code repetition.

Co-developed-by: Jamal Hadi Salim <jhs@...atatu.com>
Signed-off-by: Jamal Hadi Salim <jhs@...atatu.com>
Co-developed-by: Pedro Tammela <pctammela@...atatu.com>
Signed-off-by: Pedro Tammela <pctammela@...atatu.com>
Signed-off-by: Victor Nogueira <victor@...atatu.com>
---
 net/sched/act_mirred.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
index 6f2544c1e396..a1be8f3c4a8e 100644
--- a/net/sched/act_mirred.c
+++ b/net/sched/act_mirred.c
@@ -89,6 +89,16 @@ static const struct nla_policy mirred_policy[TCA_MIRRED_MAX + 1] = {
 
 static struct tc_action_ops act_mirred_ops;
 
+static void tcf_mirred_replace_dev(struct tcf_mirred *m,
+				   struct net_device *ndev)
+{
+	struct net_device *odev;
+
+	odev = rcu_replace_pointer(m->tcfm_dev, ndev,
+				   lockdep_is_held(&m->tcf_lock));
+	netdev_put(odev, &m->tcfm_dev_tracker);
+}
+
 static int tcf_mirred_init(struct net *net, struct nlattr *nla,
 			   struct nlattr *est, struct tc_action **a,
 			   struct tcf_proto *tp,
@@ -170,7 +180,7 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
 	spin_lock_bh(&m->tcf_lock);
 
 	if (parm->ifindex) {
-		struct net_device *odev, *ndev;
+		struct net_device *ndev;
 
 		ndev = dev_get_by_index(net, parm->ifindex);
 		if (!ndev) {
@@ -179,9 +189,7 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
 			goto put_chain;
 		}
 		mac_header_xmit = dev_is_mac_header_xmit(ndev);
-		odev = rcu_replace_pointer(m->tcfm_dev, ndev,
-					  lockdep_is_held(&m->tcf_lock));
-		netdev_put(odev, &m->tcfm_dev_tracker);
+		tcf_mirred_replace_dev(m, ndev);
 		netdev_tracker_alloc(ndev, &m->tcfm_dev_tracker, GFP_ATOMIC);
 		m->tcfm_mac_header_xmit = mac_header_xmit;
 	}
-- 
2.25.1