diff mbox series

[mptcp-next,v2,4/7] mptcp: cleanup writer wake-up

Message ID 29aa1523f11bdc4b5605f9b33ca03f2529c87811.1707739536.git.pabeni@redhat.com (mailing list archive)
State Superseded, archived
Delegated to: Mat Martineau
Headers show
Series mptcp: implement TCP_NOTSENT_LOWAT support | expand

Checks

Context Check Description
matttbe/checkpatch success total: 0 errors, 0 warnings, 0 checks, 61 lines checked
matttbe/build success Build and static analysis OK
matttbe/KVM_Validation__normal success Success! ✅
matttbe/KVM_Validation__debug__except_selftest_mptcp_join_ success Success! ✅
matttbe/KVM_Validation__debug__only_selftest_mptcp_join_ success Success! ✅

Commit Message

Paolo Abeni Feb. 12, 2024, 3:18 p.m. UTC 
After commit 5cf92bbadc58 ("mptcp: re-enable sndbuf autotune"), the
MPTCP_NOSPACE bit is redundant: it is always set and cleared together with
SOCK_NOSPACE.

Let's drop the first and always relay on the latter, dropping a bunch
of useless code.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
 net/mptcp/protocol.c | 15 +++------------
 net/mptcp/protocol.h | 16 ++++++----------
 2 files changed, 9 insertions(+), 22 deletions(-)
diff mbox series

Patch

diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 7c3cb97214b8..def01e030121 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -1692,15 +1692,6 @@  static void __mptcp_subflow_push_pending(struct sock *sk, struct sock *ssk, bool
 	}
 }
 
-static void mptcp_set_nospace(struct sock *sk)
-{
-	/* enable autotune */
-	set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
-
-	/* will be cleared on avail space */
-	set_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags);
-}
-
 static int mptcp_disconnect(struct sock *sk, int flags);
 
 static int mptcp_sendmsg_fastopen(struct sock *sk, struct msghdr *msg,
@@ -1874,7 +1865,7 @@  static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 		continue;
 
 wait_for_memory:
-		mptcp_set_nospace(sk);
+		set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
 		__mptcp_push_pending(sk, msg->msg_flags);
 		ret = sk_stream_wait_memory(sk, &timeo);
 		if (ret)
@@ -3896,8 +3887,8 @@  static __poll_t mptcp_check_writeable(struct mptcp_sock *msk)
 	if (sk_stream_is_writeable(sk))
 		return EPOLLOUT | EPOLLWRNORM;
 
-	mptcp_set_nospace(sk);
-	smp_mb__after_atomic(); /* msk->flags is changed by write_space cb */
+	set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
+	smp_mb__after_atomic(); /* NOSPACE is changed by mptcp_write_space() */
 	if (sk_stream_is_writeable(sk))
 		return EPOLLOUT | EPOLLWRNORM;
 
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 2e197262a42e..0aa77c03643d 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -113,10 +113,9 @@ 
 #define MPTCP_RST_TRANSIENT	BIT(0)
 
 /* MPTCP socket atomic flags */
-#define MPTCP_NOSPACE		1
-#define MPTCP_WORK_RTX		2
-#define MPTCP_FALLBACK_DONE	4
-#define MPTCP_WORK_CLOSE_SUBFLOW 5
+#define MPTCP_WORK_RTX		1
+#define MPTCP_FALLBACK_DONE	2
+#define MPTCP_WORK_CLOSE_SUBFLOW 3
 
 /* MPTCP socket release cb flags */
 #define MPTCP_PUSH_PENDING	1
@@ -799,12 +798,9 @@  static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk)
 
 static inline void mptcp_write_space(struct sock *sk)
 {
-	if (sk_stream_is_writeable(sk)) {
-		/* pairs with memory barrier in mptcp_poll */
-		smp_mb();
-		if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags))
-			sk_stream_write_space(sk);
-	}
+	/* pairs with memory barrier in mptcp_poll */
+	smp_mb();
+	sk_stream_write_space(sk);
 }
 
 static inline void __mptcp_sync_sndbuf(struct sock *sk)