From: Geliang Tang geliang.tang@suse.com
commit 0530020a7c8f2204e784f0dbdc882bbd961fdbde upstream.
This patch adds a new member allow_infinite_fallback in mptcp_sock, which is initialized to 'true' when the connection begins and is set to 'false' on any retransmit or successful MP_JOIN. Only do infinite mapping fallback if there is a single subflow AND there have been no retransmissions AND there have never been any MP_JOINs.
Suggested-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Geliang Tang geliang.tang@suse.com Signed-off-by: Mat Martineau mathew.j.martineau@linux.intel.com Signed-off-by: David S. Miller davem@davemloft.net Stable-dep-of: e32d262c89e2 ("mptcp: handle consistently DSS corruption") [ Conflicts in protocol.c, because commit 3e5014909b56 ("mptcp: cleanup MPJ subflow list handling") is not in this version. This commit is linked to a new feature, changing the context around. The new line can still be added at the same place. Conflicts in protocol.h, because commit 4f6e14bd19d6 ("mptcp: support TCP_CORK and TCP_NODELAY") is not in this version. This commit is linked to a new feature, changing the context around. The new line can still be added at the same place. Conflicts in subflow.c, because commit 0348c690ed37 ("mptcp: add the fallback check") is not in this version. This commit is linked to a new feature, changing the context around. The new line can still be added at the same place. Extra conflicts in v5.10, because the context has been changed. ] Signed-off-by: Matthieu Baerts (NGI0) matttbe@kernel.org --- net/mptcp/protocol.c | 6 +++++- net/mptcp/protocol.h | 1 + net/mptcp/subflow.c | 1 + 3 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c index 590e2c9bb67e..24a21ff0cb8a 100644 --- a/net/mptcp/protocol.c +++ b/net/mptcp/protocol.c @@ -1810,9 +1810,11 @@ static void mptcp_worker(struct work_struct *work) if (!mptcp_ext_cache_refill(msk)) break; } - if (copied) + if (copied) { tcp_push(ssk, msg.msg_flags, mss_now, tcp_sk(ssk)->nonagle, size_goal); + WRITE_ONCE(msk->allow_infinite_fallback, false); + }
dfrag->data_seq = orig_write_seq; dfrag->offset = orig_offset; @@ -1845,6 +1847,7 @@ static int __mptcp_init_sock(struct sock *sk)
msk->first = NULL; inet_csk(sk)->icsk_sync_mss = mptcp_sync_mss; + WRITE_ONCE(msk->allow_infinite_fallback, true);
mptcp_pm_data_init(msk);
@@ -2543,6 +2546,7 @@ bool mptcp_finish_join(struct sock *sk) if (parent_sock && !sk->sk_socket) mptcp_sock_graft(sk, parent_sock); subflow->map_seq = READ_ONCE(msk->ack_seq); + WRITE_ONCE(msk->allow_infinite_fallback, false); return true; }
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h index 44944e8f73c5..2330140d6b1c 100644 --- a/net/mptcp/protocol.h +++ b/net/mptcp/protocol.h @@ -213,6 +213,7 @@ struct mptcp_sock { bool rcv_data_fin; bool snd_data_fin_enable; bool use_64bit_ack; /* Set when we received a 64-bit DSN */ + bool allow_infinite_fallback; spinlock_t join_list_lock; struct work_struct work; struct sk_buff *ooo_last_skb; diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c index 843c61ebd421..0c020ca463f4 100644 --- a/net/mptcp/subflow.c +++ b/net/mptcp/subflow.c @@ -1179,6 +1179,7 @@ int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, list_add_tail(&subflow->node, &msk->join_list); spin_unlock_bh(&msk->join_list_lock);
+ WRITE_ONCE(msk->allow_infinite_fallback, false); return err;
failed: