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mptcp: call tcp_cleanup_rbuf on subflows

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That is needed to let the subflows announce promptly when new
space is available in the receive buffer.

tcp_cleanup_rbuf() is currently a static function, drop the
scope modifier and add a declaration in the TCP header.

Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2020-09-14 10:01:18 +02:00 • committed by David S. Miller
parent d5f49190de
commit c76c695656
4 changed files with 11 additions and 1 deletions
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2
include/net/tcp.h
View file

@ -1414,6 +1414,8 @@ static inline int tcp_full_space(const struct sock *sk)
return tcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf)); return tcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf));
} }
void tcp_cleanup_rbuf(struct sock *sk, int copied);
/* We provision sk_rcvbuf around 200% of sk_rcvlowat. /* We provision sk_rcvbuf around 200% of sk_rcvlowat.
* If 87.5 % (7/8) of the space has been consumed, we want to override * If 87.5 % (7/8) of the space has been consumed, we want to override
* SO_RCVLOWAT constraint, since we are receiving skbs with too small * SO_RCVLOWAT constraint, since we are receiving skbs with too small

2
net/ipv4/tcp.c
View file

@ -1527,7 +1527,7 @@ 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 * calculation of whether or not we must ACK for the sake of
* a window update. * 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); struct tcp_sock *tp = tcp_sk(sk);
bool time_to_ack = false; bool time_to_ack = false;

6
net/mptcp/protocol.c
View file

@ -515,6 +515,8 @@ static bool __mptcp_move_skbs_from_subflow(struct mptcp_sock *msk,
} while (more_data_avail); } while (more_data_avail);
*bytes += moved; *bytes += moved;
if (moved)
tcp_cleanup_rbuf(ssk, moved);
return done; return done;
} }
@ -1424,10 +1426,14 @@ static void mptcp_rcv_space_adjust(struct mptcp_sock *msk, int copied)
*/ */
mptcp_for_each_subflow(msk, subflow) { mptcp_for_each_subflow(msk, subflow) {
struct sock *ssk; struct sock *ssk;
bool slow;
ssk = mptcp_subflow_tcp_sock(subflow); ssk = mptcp_subflow_tcp_sock(subflow);
slow = lock_sock_fast(ssk);
WRITE_ONCE(ssk->sk_rcvbuf, rcvbuf); WRITE_ONCE(ssk->sk_rcvbuf, rcvbuf);
tcp_sk(ssk)->window_clamp = window_clamp; tcp_sk(ssk)->window_clamp = window_clamp;
tcp_cleanup_rbuf(ssk, 1);
unlock_sock_fast(ssk, slow);
} }
} }
} }

2
net/mptcp/subflow.c
View file

@ -823,6 +823,8 @@ static void mptcp_subflow_discard_data(struct sock *ssk, struct sk_buff *skb,
sk_eat_skb(ssk, skb); sk_eat_skb(ssk, skb);
if (mptcp_subflow_get_map_offset(subflow) >= subflow->map_data_len) if (mptcp_subflow_get_map_offset(subflow) >= subflow->map_data_len)
subflow->map_valid = 0; subflow->map_valid = 0;
if (incr)
tcp_cleanup_rbuf(ssk, incr);
} }
static bool subflow_check_data_avail(struct sock *ssk) static bool subflow_check_data_avail(struct sock *ssk)