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mptcp: fix potential wake-up event loss

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After the blamed commit below, the send buffer auto-tuning can
happen after that the mptcp_propagate_sndbuf() completes - via
the delegated action infrastructure.

We must check for write space even after such change or we risk
missing the wake-up event.

Fixes: 8005184fd1 ("mptcp: refactor sndbuf auto-tuning")
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://lore.kernel.org/r/20240223-upstream-net-20240223-misc-fixes-v1-6-162e87e48497@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Paolo Abeni 2024-02-23 17:14:16 +01:00 committed by Jakub Kicinski
parent adf1bb78da
commit b111d8fbd2
1 changed files with 11 additions and 10 deletions
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21
net/mptcp/protocol.h
View File

@ -790,6 +790,16 @@ static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk)
READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt);
}
static inline void mptcp_write_space(struct sock *sk)
{
if (sk_stream_is_writeable(sk)) {
/* pairs with memory barrier in mptcp_poll */
smp_mb();
if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags))
sk_stream_write_space(sk);
}
}
static inline void __mptcp_sync_sndbuf(struct sock *sk)
{
struct mptcp_subflow_context *subflow;
@ -808,6 +818,7 @@ static inline void __mptcp_sync_sndbuf(struct sock *sk)
/* the msk max wmem limit is <nr_subflows> * tcp wmem[2] */
WRITE_ONCE(sk->sk_sndbuf, new_sndbuf);
mptcp_write_space(sk);
}
/* The called held both the msk socket and the subflow socket locks,
@ -838,16 +849,6 @@ static inline void mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk)
local_bh_enable();
}
static inline void mptcp_write_space(struct sock *sk)
{
if (sk_stream_is_writeable(sk)) {
/* pairs with memory barrier in mptcp_poll */
smp_mb();
if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags))
sk_stream_write_space(sk);
}
}
void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags);
#define MPTCP_TOKEN_MAX_RETRIES 4