From: Paolo Abeni <pabeni@redhat.com>
The mptcp-level TX path info (write_seq, bytes_sent, snd_nxt) are under
the msk socket lock protection, and are accessed lockless in a few spots.
Always mark the write operations with WRITE_ONCE, read operations
outside the lock with READ_ONCE and drop the annotation for read
under such lock.
To simplify the annotations move mptcp_pending_data_fin_ack() from
__mptcp_data_acked() to __mptcp_clean_una(), under the msk socket
lock, where such call would belong.
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
---
net/mptcp/options.c | 2 +-
net/mptcp/protocol.c | 15 +++++++--------
net/mptcp/protocol.h | 2 +-
3 files changed, 9 insertions(+), 10 deletions(-)
diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index 5e2b130d8680..9b31a0a06265 100644
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -1060,7 +1060,7 @@ static void ack_update_msk(struct mptcp_sock *msk,
msk->wnd_end = new_wnd_end;
/* this assumes mptcp_incoming_options() is invoked after tcp_ack() */
- if (after64(msk->wnd_end, READ_ONCE(msk->snd_nxt)))
+ if (after64(msk->wnd_end, snd_nxt))
__mptcp_check_push(sk, ssk);
if (after64(new_snd_una, old_snd_una)) {
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index 874f019c5093..b1c24ac3630f 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -1033,13 +1033,15 @@ static void __mptcp_clean_una(struct sock *sk)
msk->recovery = false;
out:
- if (snd_una == READ_ONCE(msk->snd_nxt) &&
- snd_una == READ_ONCE(msk->write_seq)) {
+ if (snd_una == msk->snd_nxt && snd_una == msk->write_seq) {
if (mptcp_rtx_timer_pending(sk) && !mptcp_data_fin_enabled(msk))
mptcp_stop_rtx_timer(sk);
} else {
mptcp_reset_rtx_timer(sk);
}
+
+ if (mptcp_pending_data_fin_ack(sk))
+ mptcp_schedule_work(sk);
}
static void __mptcp_clean_una_wakeup(struct sock *sk)
@@ -1499,7 +1501,7 @@ static void mptcp_update_post_push(struct mptcp_sock *msk,
*/
if (likely(after64(snd_nxt_new, msk->snd_nxt))) {
msk->bytes_sent += snd_nxt_new - msk->snd_nxt;
- msk->snd_nxt = snd_nxt_new;
+ WRITE_ONCE(msk->snd_nxt, snd_nxt_new);
}
}
@@ -3200,8 +3202,8 @@ struct sock *mptcp_sk_clone_init(const struct sock *sk,
if (mp_opt->suboptions & OPTION_MPTCP_CSUMREQD)
WRITE_ONCE(msk->csum_enabled, true);
- msk->write_seq = subflow_req->idsn + 1;
- msk->snd_nxt = msk->write_seq;
+ WRITE_ONCE(msk->write_seq, subflow_req->idsn + 1);
+ WRITE_ONCE(msk->snd_nxt, msk->write_seq);
msk->snd_una = msk->write_seq;
msk->wnd_end = msk->snd_nxt + req->rsk_rcv_wnd;
msk->setsockopt_seq = mptcp_sk(sk)->setsockopt_seq;
@@ -3303,9 +3305,6 @@ void __mptcp_data_acked(struct sock *sk)
__mptcp_clean_una(sk);
else
__set_bit(MPTCP_CLEAN_UNA, &mptcp_sk(sk)->cb_flags);
-
- if (mptcp_pending_data_fin_ack(sk))
- mptcp_schedule_work(sk);
}
void __mptcp_check_push(struct sock *sk, struct sock *ssk)
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h
index 13b8cf8ec704..421dede93e2b 100644
--- a/net/mptcp/protocol.h
+++ b/net/mptcp/protocol.h
@@ -402,7 +402,7 @@ static inline struct mptcp_data_frag *mptcp_rtx_head(struct sock *sk)
{
struct mptcp_sock *msk = mptcp_sk(sk);
- if (msk->snd_una == READ_ONCE(msk->snd_nxt))
+ if (msk->snd_una == msk->snd_nxt)
return NULL;
return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list);
--
2.43.0