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authorPaolo Abeni <pabeni@redhat.com>2022-01-06 16:20:17 -0800
committerDavid S. Miller <davem@davemloft.net>2022-01-07 11:27:07 +0000
commit71ba088ce0aa87370b18a1d35cd742f352d51c24 (patch)
tree4b492bb3324b1ef9aed7ee39185b85bc756a36e4 /net/mptcp
parentb29fcfb54cd70caca5b11c80d8d238854938884a (diff)
mptcp: cleanup accept and poll
After the previous patch, msk->subflow will never be deleted during the whole msk lifetime. We don't need anymore to acquire references to it in mptcp_stream_accept() and we can use the listener subflow accept queue to simplify mptcp_poll() for listener socket. Overall this removes a lock pair and 4 more atomic operations per accept(). Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mptcp')
-rw-r--r--net/mptcp/protocol.c25
-rw-r--r--net/mptcp/protocol.h1
-rw-r--r--net/mptcp/subflow.c1
3 files changed, 7 insertions, 20 deletions
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 83f6d6c3e3eb..628cd60c9d0f 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -3493,17 +3493,9 @@ static int mptcp_stream_accept(struct socket *sock, struct socket *newsock,
pr_debug("msk=%p", msk);
- lock_sock(sock->sk);
- if (sock->sk->sk_state != TCP_LISTEN)
- goto unlock_fail;
-
ssock = __mptcp_nmpc_socket(msk);
if (!ssock)
- goto unlock_fail;
-
- clear_bit(MPTCP_DATA_READY, &msk->flags);
- sock_hold(ssock->sk);
- release_sock(sock->sk);
+ return -EINVAL;
err = ssock->ops->accept(sock, newsock, flags, kern);
if (err == 0 && !mptcp_is_tcpsk(newsock->sk)) {
@@ -3543,14 +3535,7 @@ static int mptcp_stream_accept(struct socket *sock, struct socket *newsock,
release_sock(newsk);
}
- if (inet_csk_listen_poll(ssock->sk))
- set_bit(MPTCP_DATA_READY, &msk->flags);
- sock_put(ssock->sk);
return err;
-
-unlock_fail:
- release_sock(sock->sk);
- return -EINVAL;
}
static __poll_t mptcp_check_readable(struct mptcp_sock *msk)
@@ -3596,8 +3581,12 @@ static __poll_t mptcp_poll(struct file *file, struct socket *sock,
state = inet_sk_state_load(sk);
pr_debug("msk=%p state=%d flags=%lx", msk, state, msk->flags);
- if (state == TCP_LISTEN)
- return test_bit(MPTCP_DATA_READY, &msk->flags) ? EPOLLIN | EPOLLRDNORM : 0;
+ if (state == TCP_LISTEN) {
+ if (WARN_ON_ONCE(!msk->subflow || !msk->subflow->sk))
+ return 0;
+
+ return inet_csk_listen_poll(msk->subflow->sk);
+ }
if (state != TCP_SYN_SENT && state != TCP_SYN_RECV) {
mask |= mptcp_check_readable(msk);
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 1a4ca5a202c8..386d1a98ff1d 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -111,7 +111,6 @@
#define MPTCP_RST_TRANSIENT BIT(0)
/* MPTCP socket flags */
-#define MPTCP_DATA_READY 0
#define MPTCP_NOSPACE 1
#define MPTCP_WORK_RTX 2
#define MPTCP_WORK_EOF 3
diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 24bc9d5e87be..d861307f7efe 100644
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -1293,7 +1293,6 @@ static void subflow_data_ready(struct sock *sk)
if (reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue))
return;
- set_bit(MPTCP_DATA_READY, &msk->flags);
parent->sk_data_ready(parent);
return;
}