diff options
| author | Matthieu Baerts (NGI0) <matttbe@kernel.org> | 2025-02-21 16:44:03 +0100 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2025-02-24 18:23:44 -0800 |
| commit | 8275ac799ee15e972841eb77b694d63f5e888519 (patch) | |
| tree | a359becb06c3565f8614502426a6ea5a888b3df3 | |
| parent | b68b106b0f15424db6c78d8c1a0616f698080b9d (diff) | |
mptcp: blackhole: avoid checking the state twice
A small cleanup, reordering the conditions to avoid checking things
twice.
The code here is called in case of timeout on a TCP connection, before
triggering a retransmission. But it only acts on SYN + MPC packets.
So the conditions can be re-order to exit early in case of non-MPTCP
SYN + MPC. This also reduce the indentation levels.
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20250221-net-next-mptcp-pm-misc-cleanup-3-v1-10-2b70ab1cee79@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| -rw-r--r-- | net/mptcp/ctrl.c | 30 |
1 files changed, 17 insertions, 13 deletions
diff --git a/net/mptcp/ctrl.c b/net/mptcp/ctrl.c index 2dd81e6c26bd..be6c0237e10b 100644 --- a/net/mptcp/ctrl.c +++ b/net/mptcp/ctrl.c @@ -401,26 +401,30 @@ void mptcp_active_enable(struct sock *sk) void mptcp_active_detect_blackhole(struct sock *ssk, bool expired) { struct mptcp_subflow_context *subflow; + u8 timeouts, to_max; + struct net *net; - if (!sk_is_mptcp(ssk)) + /* Only check MPTCP SYN ... */ + if (likely(!sk_is_mptcp(ssk) || ssk->sk_state != TCP_SYN_SENT)) return; subflow = mptcp_subflow_ctx(ssk); - if (subflow->request_mptcp && ssk->sk_state == TCP_SYN_SENT) { - struct net *net = sock_net(ssk); - u8 timeouts, to_max; + /* ... + MP_CAPABLE */ + if (!subflow->request_mptcp) { + /* Mark as blackhole iif the 1st non-MPTCP SYN is accepted */ + subflow->mpc_drop = 0; + return; + } - timeouts = inet_csk(ssk)->icsk_retransmits; - to_max = mptcp_get_pernet(net)->syn_retrans_before_tcp_fallback; + net = sock_net(ssk); + timeouts = inet_csk(ssk)->icsk_retransmits; + to_max = mptcp_get_pernet(net)->syn_retrans_before_tcp_fallback; - if (timeouts == to_max || (timeouts < to_max && expired)) { - MPTCP_INC_STATS(net, MPTCP_MIB_MPCAPABLEACTIVEDROP); - subflow->mpc_drop = 1; - mptcp_subflow_early_fallback(mptcp_sk(subflow->conn), subflow); - } - } else if (ssk->sk_state == TCP_SYN_SENT) { - subflow->mpc_drop = 0; + if (timeouts == to_max || (timeouts < to_max && expired)) { + MPTCP_INC_STATS(net, MPTCP_MIB_MPCAPABLEACTIVEDROP); + subflow->mpc_drop = 1; + mptcp_subflow_early_fallback(mptcp_sk(subflow->conn), subflow); } } |