mptcp: add statistics for mptcp socket in use

Do the statistics of mptcp socket in use with sock_prot_inuse_add().
Therefore, we can get the count of used mptcp socket from
/proc/net/protocols:

& cat /proc/net/protocols
protocol  size sockets  memory press maxhdr  slab module     cl co di ac io in de sh ss gs se re sp bi br ha uh gp em
MPTCPv6   2048      0       0   no       0   yes  kernel      y  n  y  y  y  y  y  y  y  y  y  y  n  n  n  y  y  y  n
MPTCP     1896      1       0   no       0   yes  kernel      y  n  y  y  y  y  y  y  y  y  y  y  n  n  n  y  y  y  n

Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Menglong Dong <imagedong@tencent.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 1ce003f..13595d6 100644 (file)
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2891,6 +2891,12 @@ static __poll_t mptcp_check_readable(struct mptcp_sock *msk)
        return EPOLLIN | EPOLLRDNORM;
 }
 
+static void mptcp_listen_inuse_dec(struct sock *sk)
+{
+       if (inet_sk_state_load(sk) == TCP_LISTEN)
+               sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
+}
+
 bool __mptcp_close(struct sock *sk, long timeout)
 {
        struct mptcp_subflow_context *subflow;
@@ -2900,6 +2906,7 @@ bool __mptcp_close(struct sock *sk, long timeout)
        sk->sk_shutdown = SHUTDOWN_MASK;
 
        if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) {
+               mptcp_listen_inuse_dec(sk);
                inet_sk_state_store(sk, TCP_CLOSE);
                goto cleanup;
        }
@@ -3000,6 +3007,7 @@ static int mptcp_disconnect(struct sock *sk, int flags)
        if (msk->fastopening)
                return 0;
 
+       mptcp_listen_inuse_dec(sk);
        inet_sk_state_store(sk, TCP_CLOSE);
 
        mptcp_stop_timer(sk);
@@ -3657,8 +3665,10 @@ static int mptcp_listen(struct socket *sock, int backlog)
 
        err = ssock->ops->listen(ssock, backlog);
        inet_sk_state_store(sk, inet_sk_state_load(ssock->sk));
-       if (!err)
+       if (!err) {
+               sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
                mptcp_copy_inaddrs(sk, ssock->sk);
+       }
 
        mptcp_event_pm_listener(ssock->sk, MPTCP_EVENT_LISTENER_CREATED);
 

diff --git a/net/mptcp/token.c b/net/mptcp/token.c
index 3af502a..5bb9245 100644 (file)
--- a/net/mptcp/token.c
+++ b/net/mptcp/token.c
@@ -153,6 +153,7 @@ int mptcp_token_new_connect(struct sock *ssk)
        struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
        struct mptcp_sock *msk = mptcp_sk(subflow->conn);
        int retries = MPTCP_TOKEN_MAX_RETRIES;
+       struct sock *sk = subflow->conn;
        struct token_bucket *bucket;
 
 again:
@@ -175,6 +176,7 @@ again:
        __sk_nulls_add_node_rcu((struct sock *)msk, &bucket->msk_chain);
        bucket->chain_len++;
        spin_unlock_bh(&bucket->lock);
+       sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
        return 0;
 }
 
@@ -190,8 +192,10 @@ void mptcp_token_accept(struct mptcp_subflow_request_sock *req,
                        struct mptcp_sock *msk)
 {
        struct mptcp_subflow_request_sock *pos;
+       struct sock *sk = (struct sock *)msk;
        struct token_bucket *bucket;
 
+       sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
        bucket = token_bucket(req->token);
        spin_lock_bh(&bucket->lock);
 
@@ -370,12 +374,14 @@ void mptcp_token_destroy_request(struct request_sock *req)
  */
 void mptcp_token_destroy(struct mptcp_sock *msk)
 {
+       struct sock *sk = (struct sock *)msk;
        struct token_bucket *bucket;
        struct mptcp_sock *pos;
 
        if (sk_unhashed((struct sock *)msk))
                return;
 
+       sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
        bucket = token_bucket(msk->token);
        spin_lock_bh(&bucket->lock);
        pos = __token_lookup_msk(bucket, msk->token);