From: Mat Martineau <mathew.j.martineau@linux.intel.com>
To: mptcp@lists.linux.dev
Cc: Mat Martineau <mathew.j.martineau@linux.intel.com>
Subject: [PATCH mptcp-net 2/3] mptcp: Add a variant of mptcp_subflow_send_ack() for locked subflows
Date: Tue, 28 Jun 2022 12:03:55 -0700 [thread overview]
Message-ID: <20220628190356.326233-3-mathew.j.martineau@linux.intel.com> (raw)
In-Reply-To: <20220628190356.326233-1-mathew.j.martineau@linux.intel.com>
The existing mptcp_subflow_send_ack() function handles subflow locking,
but it's also sometimes necessary to force an ack from a caller that
already holds the subflow socket lock. This is required for the
following commit.
Fixes: 340fa6667a69 ("mptcp: Only send extra TCP acks in eligible socket states")
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
---
net/mptcp/protocol.c | 9 +++++++--
net/mptcp/protocol.h | 1 +
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 3efbae948707..b96a80c8e22a 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -506,13 +506,18 @@ static inline bool tcp_can_send_ack(const struct sock *ssk)
(TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_TIME_WAIT | TCPF_CLOSE | TCPF_LISTEN));
}
+void __mptcp_subflow_send_ack(struct sock *ssk)
+{
+ if (tcp_can_send_ack(ssk))
+ tcp_send_ack(ssk);
+}
+
void mptcp_subflow_send_ack(struct sock *ssk)
{
bool slow;
slow = lock_sock_fast(ssk);
- if (tcp_can_send_ack(ssk))
- tcp_send_ack(ssk);
+ __mptcp_subflow_send_ack(ssk);
unlock_sock_fast(ssk, slow);
}
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index c14d70c036d0..033c995772dc 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -607,6 +607,7 @@ void __init mptcp_subflow_init(void);
void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how);
void mptcp_close_ssk(struct sock *sk, struct sock *ssk,
struct mptcp_subflow_context *subflow);
+void __mptcp_subflow_send_ack(struct sock *ssk);
void mptcp_subflow_send_ack(struct sock *ssk);
void mptcp_subflow_reset(struct sock *ssk);
void mptcp_subflow_queue_clean(struct sock *ssk);
--
2.37.0
next prev parent reply other threads:[~2022-06-28 19:04 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-28 19:03 [PATCH mptcp-net 0/3] Locking fixes for subflow flag changes Mat Martineau
2022-06-28 19:03 ` [PATCH mptcp-net 1/3] mptcp: Avoid acquiring PM lock for subflow priority changes Mat Martineau
2022-06-29 19:57 ` Paolo Abeni
2022-06-28 19:03 ` Mat Martineau [this message]
2022-06-28 19:03 ` [PATCH mptcp-net 3/3] mptcp: Acquire the subflow socket lock before modifying MP_PRIO flags Mat Martineau
2022-06-28 20:50 ` mptcp: Acquire the subflow socket lock before modifying MP_PRIO flags: Tests Results MPTCP CI
2022-06-29 19:59 ` [PATCH mptcp-net 3/3] mptcp: Acquire the subflow socket lock before modifying MP_PRIO flags Paolo Abeni
2022-06-29 20:51 ` Mat Martineau
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