netdev - [PATCH net-next v2 12/12] net: sched: flower: set unlocked flag for flower proto ops

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Message-Id: <20190227101226.26196-13-vladbu@mellanox.com>
Date:   Wed, 27 Feb 2019 12:12:26 +0200
From:   Vlad Buslov <vladbu@...lanox.com>
To:     netdev@...r.kernel.org
Cc:     jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
        davem@...emloft.net, sbrivio@...hat.com,
        Vlad Buslov <vladbu@...lanox.com>
Subject: [PATCH net-next v2 12/12] net: sched: flower: set unlocked flag for flower proto ops

Set TCF_PROTO_OPS_DOIT_UNLOCKED for flower classifier to indicate that its
ops callbacks don't require caller to hold rtnl lock. Don't take rtnl lock
in fl_destroy_filter_work() that is executed on workqueue instead of being
called by cls API and is not affected by setting
TCF_PROTO_OPS_DOIT_UNLOCKED. Rtnl mutex is still manually taken by flower
classifier before calling hardware offloads API that has not been updated
for unlocked execution.

Signed-off-by: Vlad Buslov <vladbu@...lanox.com>
---
Changes from V1 to V2:
  - Don't take rtnl lock before calling __fl_destroy_filter() in
    workqueue context.
  - Extend commit message with explanation why flower still takes rtnl
    lock before calling hardware offloads API.

 net/sched/cls_flower.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 68bac808cf35..0638f17ac5ab 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -368,9 +368,7 @@ static void fl_destroy_filter_work(struct work_struct *work)
 	struct cls_fl_filter *f = container_of(to_rcu_work(work),
 					struct cls_fl_filter, rwork);
 
-	rtnl_lock();
 	__fl_destroy_filter(f);
-	rtnl_unlock();
 }
 
 static void fl_hw_destroy_filter(struct tcf_proto *tp, struct cls_fl_filter *f,
@@ -2372,6 +2370,7 @@ static struct tcf_proto_ops cls_fl_ops __read_mostly = {
 	.tmplt_destroy	= fl_tmplt_destroy,
 	.tmplt_dump	= fl_tmplt_dump,
 	.owner		= THIS_MODULE,
+	.flags		= TCF_PROTO_OPS_DOIT_UNLOCKED,
 };
 
 static int __init cls_fl_init(void)
-- 
2.13.6