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skmsg: Use rcu work for destroying psock 

The RCU callback sk_psock_destroy() only queues work psock->gc,
so we can just switch to rcu work to simplify the code.

Signed-off-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20210331023237.41094-6-xiyou.wangcong@gmail.com
This commit is contained in:
Cong Wang 2021-03-30 19:32:26 -07:00 committed by Alexei Starovoitov
parent 799aa7f98d
commit 7786dfc41a
2 changed files with 6 additions and 16 deletions
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5
include/linux/skmsg.h
View File

@ -102,10 +102,7 @@ struct sk_psock {
struct mutex work_mutex;
struct sk_psock_work_state work_state;
struct work_struct work;
union {
struct rcu_head rcu;
struct work_struct gc;
};
struct rcu_work rwork;
};
int sk_msg_alloc(struct sock *sk, struct sk_msg *msg, int len,

17
net/core/skmsg.c
View File

@ -666,10 +666,10 @@ void sk_psock_stop(struct sk_psock *psock, bool wait)
static void sk_psock_done_strp(struct sk_psock *psock);
static void sk_psock_destroy_deferred(struct work_struct *gc)
static void sk_psock_destroy(struct work_struct *work)
{
struct sk_psock *psock = container_of(gc, struct sk_psock, gc);
struct sk_psock *psock = container_of(to_rcu_work(work),
struct sk_psock, rwork);
/* No sk_callback_lock since already detached. */
sk_psock_done_strp(psock);
@ -688,14 +688,6 @@ static void sk_psock_destroy_deferred(struct work_struct *gc)
kfree(psock);
}
static void sk_psock_destroy(struct rcu_head *rcu)
{
struct sk_psock *psock = container_of(rcu, struct sk_psock, rcu);
INIT_WORK(&psock->gc, sk_psock_destroy_deferred);
schedule_work(&psock->gc);
}
void sk_psock_drop(struct sock *sk, struct sk_psock *psock)
{
sk_psock_stop(psock, false);
@ -709,7 +701,8 @@ void sk_psock_drop(struct sock *sk, struct sk_psock *psock)
sk_psock_stop_verdict(sk, psock);
write_unlock_bh(&sk->sk_callback_lock);
call_rcu(&psock->rcu, sk_psock_destroy);
INIT_RCU_WORK(&psock->rwork, sk_psock_destroy);
queue_rcu_work(system_wq, &psock->rwork);
}
EXPORT_SYMBOL_GPL(sk_psock_drop);