netdev - [PATCH net-next 4/4] net: sched: don't take rtnl lock during flow

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Message-Id: <20200211091918.20974-5-vladbu@mellanox.com>
Date:   Tue, 11 Feb 2020 11:19:18 +0200
From:   Vlad Buslov <vladbu@...lanox.com>
To:     netdev@...r.kernel.org, davem@...emloft.net
Cc:     jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
        pablo@...filter.org, marcelo.leitner@...il.com,
        Vlad Buslov <vladbu@...lanox.com>,
        Jiri Pirko <jiri@...lanox.com>
Subject: [PATCH net-next 4/4] net: sched: don't take rtnl lock during flow_action setup

Refactor tc_setup_flow_action() function not to use rtnl lock and remove
'rtnl_held' argument that is no longer needed.

Signed-off-by: Vlad Buslov <vladbu@...lanox.com>
Acked-by: Jiri Pirko <jiri@...lanox.com>
---
 include/net/pkt_cls.h    | 2 +-
 net/sched/cls_api.c      | 8 +-------
 net/sched/cls_flower.c   | 6 ++----
 net/sched/cls_matchall.c | 4 ++--
 4 files changed, 6 insertions(+), 14 deletions(-)

diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index a972244ab193..53946b509b51 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -509,7 +509,7 @@ tcf_match_indev(struct sk_buff *skb, int ifindex)
 }
 
 int tc_setup_flow_action(struct flow_action *flow_action,
-			 const struct tcf_exts *exts, bool rtnl_held);
+			 const struct tcf_exts *exts);
 void tc_cleanup_flow_action(struct flow_action *flow_action);
 
 int tc_setup_cb_call(struct tcf_block *block, enum tc_setup_type type,
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 610505117780..13c33eaf1ca1 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -3433,7 +3433,7 @@ static void tcf_sample_get_group(struct flow_action_entry *entry,
 }
 
 int tc_setup_flow_action(struct flow_action *flow_action,
-			 const struct tcf_exts *exts, bool rtnl_held)
+			 const struct tcf_exts *exts)
 {
 	struct tc_action *act;
 	int i, j, k, err = 0;
@@ -3441,9 +3441,6 @@ int tc_setup_flow_action(struct flow_action *flow_action,
 	if (!exts)
 		return 0;
 
-	if (!rtnl_held)
-		rtnl_lock();
-
 	j = 0;
 	tcf_exts_for_each_action(i, act, exts) {
 		struct flow_action_entry *entry;
@@ -3577,9 +3574,6 @@ int tc_setup_flow_action(struct flow_action *flow_action,
 	}
 
 err_out:
-	if (!rtnl_held)
-		rtnl_unlock();
-
 	if (err)
 		tc_cleanup_flow_action(flow_action);
 
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index f9c0d1e8d380..d7d3aab53120 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -449,8 +449,7 @@ static int fl_hw_replace_filter(struct tcf_proto *tp,
 	cls_flower.rule->match.key = &f->mkey;
 	cls_flower.classid = f->res.classid;
 
-	err = tc_setup_flow_action(&cls_flower.rule->action, &f->exts,
-				   rtnl_held);
+	err = tc_setup_flow_action(&cls_flower.rule->action, &f->exts);
 	if (err) {
 		kfree(cls_flower.rule);
 		if (skip_sw) {
@@ -1999,8 +1998,7 @@ static int fl_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb,
 		cls_flower.rule->match.mask = &f->mask->key;
 		cls_flower.rule->match.key = &f->mkey;
 
-		err = tc_setup_flow_action(&cls_flower.rule->action, &f->exts,
-					   true);
+		err = tc_setup_flow_action(&cls_flower.rule->action, &f->exts);
 		if (err) {
 			kfree(cls_flower.rule);
 			if (tc_skip_sw(f->flags)) {
diff --git a/net/sched/cls_matchall.c b/net/sched/cls_matchall.c
index 039cc86974f4..bf2d42ee55a3 100644
--- a/net/sched/cls_matchall.c
+++ b/net/sched/cls_matchall.c
@@ -97,7 +97,7 @@ static int mall_replace_hw_filter(struct tcf_proto *tp,
 	cls_mall.command = TC_CLSMATCHALL_REPLACE;
 	cls_mall.cookie = cookie;
 
-	err = tc_setup_flow_action(&cls_mall.rule->action, &head->exts, true);
+	err = tc_setup_flow_action(&cls_mall.rule->action, &head->exts);
 	if (err) {
 		kfree(cls_mall.rule);
 		mall_destroy_hw_filter(tp, head, cookie, NULL);
@@ -301,7 +301,7 @@ static int mall_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb,
 		TC_CLSMATCHALL_REPLACE : TC_CLSMATCHALL_DESTROY;
 	cls_mall.cookie = (unsigned long)head;
 
-	err = tc_setup_flow_action(&cls_mall.rule->action, &head->exts, true);
+	err = tc_setup_flow_action(&cls_mall.rule->action, &head->exts);
 	if (err) {
 		kfree(cls_mall.rule);
 		if (add && tc_skip_sw(head->flags)) {
-- 
2.21.0