diff options
| author | Cong Wang <cong.wang@bytedance.com> | 2021-03-30 19:32:25 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2021-04-01 10:56:13 -0700 |
| commit | 799aa7f98d53e0f541fa6b4dc9aa47b4ff2178e3 (patch) | |
| tree | 38226a66a54ab0b7db060abb3e08cadebaa6500c /include/linux/skmsg.h | |
| parent | 0739cd28f2645e814586c7536ba5da9825cb8029 (diff) | |
skmsg: Avoid lock_sock() in sk_psock_backlog()
We do not have to lock the sock to avoid losing sk_socket,
instead we can purge all the ingress queues when we close
the socket. Sending or receiving packets after orphaning
socket makes no sense.
We do purge these queues when psock refcnt reaches zero but
here we want to purge them explicitly in sock_map_close().
There are also some nasty race conditions on testing bit
SK_PSOCK_TX_ENABLED and queuing/canceling the psock work,
we can expand psock->ingress_lock a bit to protect them too.
As noticed by John, we still have to lock the psock->work,
because the same work item could be running concurrently on
different CPU's.
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/20210331023237.41094-5-xiyou.wangcong@gmail.com
Diffstat (limited to 'include/linux/skmsg.h')
| -rw-r--r-- | include/linux/skmsg.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/skmsg.h b/include/linux/skmsg.h index f2d45a73b2b2..7382c4b518d7 100644 --- a/include/linux/skmsg.h +++ b/include/linux/skmsg.h @@ -99,6 +99,7 @@ struct sk_psock { void (*saved_write_space)(struct sock *sk); void (*saved_data_ready)(struct sock *sk); struct proto *sk_proto; + struct mutex work_mutex; struct sk_psock_work_state work_state; struct work_struct work; union { @@ -347,6 +348,7 @@ static inline void sk_psock_report_error(struct sk_psock *psock, int err) } struct sk_psock *sk_psock_init(struct sock *sk, int node); +void sk_psock_stop(struct sk_psock *psock, bool wait); #if IS_ENABLED(CONFIG_BPF_STREAM_PARSER) int sk_psock_init_strp(struct sock *sk, struct sk_psock *psock); |