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* [MPTCP] [PATCH v3 6/6] mptcp: send acks when moving skbs to mptcp receive queue
From: Florian Westphal @ 2020-02-20 14:34 UTC (permalink / raw)
  To: mptcp 

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This isn't strictly required, however, without this we will
punish flows that don't do bluk transmits as they will lag
behind in their window updates sent to peer.

Signed-off-by: Florian Westphal <fw(a)strlen.de>
---
 include/net/tcp.h    | 1 +
 net/ipv4/tcp.c       | 2 +-
 net/mptcp/protocol.c | 3 +++
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/include/net/tcp.h b/include/net/tcp.h
index a5ea27df3c2b..454ecab0df8b 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -650,6 +650,7 @@ static inline int tcp_bound_to_half_wnd(struct tcp_sock *tp, int pktsize)
 
 /* tcp.c */
 void tcp_get_info(struct sock *, struct tcp_info *);
+void tcp_cleanup_rbuf(struct sock *sk, int copied);
 
 /* Read 'sendfile()'-style from a TCP socket */
 int tcp_read_sock(struct sock *sk, read_descriptor_t *desc,
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 1b685485a5b5..62362885a518 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1517,7 +1517,7 @@ static int tcp_peek_sndq(struct sock *sk, struct msghdr *msg, int len)
  * calculation of whether or not we must ACK for the sake of
  * a window update.
  */
-static void tcp_cleanup_rbuf(struct sock *sk, int copied)
+void tcp_cleanup_rbuf(struct sock *sk, int copied)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 	bool time_to_ack = false;
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 02aba8b31f1f..93963bf3f9fe 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -773,6 +773,9 @@ static bool __mptcp_move_skbs(struct mptcp_sock *msk)
 			more_data_avail = mptcp_subflow_data_available(ssk);
 		} while (more_data_avail);
 
+		if (moved > 0)
+			tcp_cleanup_rbuf(ssk, moved);
+
 		release_sock(ssk);
 	} while (!done);
 
-- 
2.24.1

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