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mptcp: track and update contiguous data status 

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>
This commit is contained in:
Geliang Tang 2022-04-22 14:55:38 -07:00 committed by David S. Miller
parent 0348c690ed
commit 0530020a7c
3 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
net/mptcp/protocol.c
View File

@ -2465,6 +2465,7 @@ static void __mptcp_retrans(struct sock *sk)
dfrag->already_sent = max(dfrag->already_sent, info.sent);
tcp_push(ssk, 0, info.mss_now, tcp_sk(ssk)->nonagle,
info.size_goal);
WRITE_ONCE(msk->allow_infinite_fallback, false);
}
release_sock(ssk);
@ -2539,6 +2540,7 @@ static int __mptcp_init_sock(struct sock *sk)
msk->first = NULL;
inet_csk(sk)->icsk_sync_mss = mptcp_sync_mss;
WRITE_ONCE(msk->csum_enabled, mptcp_is_checksum_enabled(sock_net(sk)));
WRITE_ONCE(msk->allow_infinite_fallback, true);
msk->recovery = false;
mptcp_pm_data_init(msk);
@ -3275,6 +3277,7 @@ err_prohibited:
}
subflow->map_seq = READ_ONCE(msk->ack_seq);
WRITE_ONCE(msk->allow_infinite_fallback, false);
out:
mptcp_event(MPTCP_EVENT_SUB_ESTABLISHED, msk, ssk, GFP_ATOMIC);

1
net/mptcp/protocol.h
View File

@ -263,6 +263,7 @@ struct mptcp_sock {
bool rcv_fastclose;
bool use_64bit_ack; /* Set when we received a 64-bit DSN */
bool csum_enabled;
bool allow_infinite_fallback;
u8 recvmsg_inq:1,
cork:1,
nodelay:1;

4
net/mptcp/subflow.c
View File

@ -1206,7 +1206,8 @@ fallback:
if (!__mptcp_check_fallback(msk)) {
/* RFC 8684 section 3.7. */
if (subflow->send_mp_fail) {
if (mptcp_has_another_subflow(ssk)) {
if (mptcp_has_another_subflow(ssk) ||
!READ_ONCE(msk->allow_infinite_fallback)) {
ssk->sk_err = EBADMSG;
tcp_set_state(ssk, TCP_CLOSE);
subflow->reset_transient = 0;
@ -1486,6 +1487,7 @@ int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
/* discard the subflow socket */
mptcp_sock_graft(ssk, sk->sk_socket);
iput(SOCK_INODE(sf));
WRITE_ONCE(msk->allow_infinite_fallback, false);
return err;
failed_unlink: