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| author |   Paolo Abeni <pabeni@redhat.com> | 2020-11-19 11:46:03 -0800 |
|---|---|---|
| committer |   Jakub Kicinski <kuba@kernel.org> | 2020-11-20 15:33:25 -0800 |
| commit | ea4ca586b16ff2eb6157fe13969eb72d2403a3a1 (patch) | |
| tree | 8d17cb274f9432777f1f69fe0ee729b714cc345a /net/mptcp/protocol.h | |
| parent | mptcp: track window announced to peer (diff) | |
| download | linux-dev-ea4ca586b16ff2eb6157fe13969eb72d2403a3a1.tar.xz linux-dev-ea4ca586b16ff2eb6157fe13969eb72d2403a3a1.zip | |
mptcp: refine MPTCP-level ack scheduling
Send timely MPTCP-level ack is somewhat difficult when
the insertion into the msk receive level is performed
by the worker.
It needs TCP-level dup-ack to notify the MPTCP-level
ack_seq increase, as both the TCP-level ack seq and the
rcv window are unchanged.
We can actually avoid processing incoming data with the
worker, and let the subflow or recevmsg() send ack as needed.
When recvmsg() moves the skbs inside the msk receive queue,
the msk space is still unchanged, so tcp_cleanup_rbuf() could
end-up skipping TCP-level ack generation. Anyway, when
__mptcp_move_skbs() is invoked, a known amount of bytes is
going to be consumed soon: we update rcv wnd computation taking
them in account.
Additionally we need to explicitly trigger tcp_cleanup_rbuf()
when recvmsg() consumes a significant amount of the receive buffer.
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/mptcp/protocol.h')
| -rw-r--r-- | net/mptcp/protocol.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h index 67f86818203f..82d5626323b1 100644 --- a/net/mptcp/protocol.h +++ b/net/mptcp/protocol.h @@ -220,10 +220,12 @@ struct mptcp_sock { u64 rcv_data_fin_seq; struct sock *last_snd; int snd_burst; + int old_wspace; atomic64_t snd_una; atomic64_t wnd_end; unsigned long timer_ival; u32 token; + int rmem_pending; unsigned long flags; bool can_ack; bool fully_established; @@ -231,6 +233,7 @@ struct mptcp_sock { bool snd_data_fin_enable; bool use_64bit_ack; /* Set when we received a 64-bit DSN */ spinlock_t join_list_lock; + struct sock *ack_hint; struct work_struct work; struct sk_buff *ooo_last_skb; struct rb_root out_of_order_queue; @@ -258,6 +261,11 @@ static inline struct mptcp_sock *mptcp_sk(const struct sock *sk) return (struct mptcp_sock *)sk; } +static inline int __mptcp_space(const struct sock *sk) +{ + return tcp_space(sk) + READ_ONCE(mptcp_sk(sk)->rmem_pending); +} + static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) { const struct mptcp_sock *msk = mptcp_sk(sk); |