netdev - [PATCH net-next 09/13] net: sched: extend tcf

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Date:   Thu,  6 Sep 2018 10:58:58 +0300
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, stephen@...workplumber.org,
        ktkhai@...tuozzo.com, paulmck@...ux.vnet.ibm.com,
        nicolas.dichtel@...nd.com, leon@...nel.org,
        gregkh@...uxfoundation.org, mark.rutland@....com, fw@...len.de,
        dsahern@...il.com, lucien.xin@...il.com,
        jakub.kicinski@...ronome.com, christian.brauner@...ntu.com,
        jbenc@...hat.com, Vlad Buslov <vladbu@...lanox.com>
Subject: [PATCH net-next 09/13] net: sched: extend tcf_block with rcu

Extend tcf_block with rcu to allow safe deallocation when it is accessed
concurrently.

Signed-off-by: Vlad Buslov <vladbu@...lanox.com>
Acked-by: Jiri Pirko <jiri@...lanox.com>
---
 include/net/sch_generic.h | 1 +
 net/sched/cls_api.c       | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 825e2bf6c5c3..2b87b47c49f6 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -357,6 +357,7 @@ struct tcf_block {
 		struct tcf_chain *chain;
 		struct list_head filter_chain_list;
 	} chain0;
+	struct rcu_head rcu;
 };
 
 static inline void tcf_block_offload_inc(struct tcf_block *block, u32 *flags)
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index f11da74dd339..502b2da8a885 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -241,7 +241,7 @@ static void tcf_chain_destroy(struct tcf_chain *chain)
 		block->chain0.chain = NULL;
 	kfree(chain);
 	if (list_empty(&block->chain_list) && !refcount_read(&block->refcnt))
-		kfree(block);
+		kfree_rcu(block, rcu);
 }
 
 static void tcf_chain_hold(struct tcf_chain *chain)
@@ -785,7 +785,7 @@ int tcf_block_attach_ext(struct tcf_block **p_block, struct Qdisc *q,
 		if (tcf_block_shared(block))
 			tcf_block_remove(block, net);
 err_block_insert:
-		kfree(block);
+		kfree_rcu(block, rcu);
 	} else {
 		refcount_dec(&block->refcnt);
 	}
@@ -841,7 +841,7 @@ void tcf_block_detach_ext(struct tcf_block *block, struct Qdisc *q,
 		tcf_block_offload_unbind(block, q, ei);
 
 		if (free_block)
-			kfree(block);
+			kfree_rcu(block, rcu);
 		else
 			tcf_block_put_all_chains(block);
 	} else {
-- 
2.7.5