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mptcp: schedule worker when subflow is closed

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When remote side closes a subflow we should schedule the worker to
dispose of the subflow in a timely manner.

Otherwise, SF_CLOSED event won't be generated until the mptcp
socket itself is closing or local side is closing another subflow.

Signed-off-by: Florian Westphal <fw@strlen.de>
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:
Florian Westphal 2021-02-12 15:59:56 -08:00 committed by David S. Miller
parent a141e02e39
commit 40947e1399
2 changed files with 27 additions and 2 deletions
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4
net/mptcp/protocol.c
View file

@ -2170,6 +2170,10 @@ static void __mptcp_close_subflow(struct mptcp_sock *msk)
if (inet_sk_state_load(ssk) != TCP_CLOSE)
continue;
/* 'subflow_data_ready' will re-sched once rx queue is empty */
if (!skb_queue_empty_lockless(&ssk->sk_receive_queue))
continue;
mptcp_close_ssk((struct sock *)msk, ssk, subflow);
}
}

25
net/mptcp/subflow.c
View file

@ -953,6 +953,22 @@ static void mptcp_subflow_discard_data(struct sock *ssk, struct sk_buff *skb,
subflow->map_valid = 0;
}
/* sched mptcp worker to remove the subflow if no more data is pending */
static void subflow_sched_work_if_closed(struct mptcp_sock *msk, struct sock *ssk)
{
struct sock *sk = (struct sock *)msk;
if (likely(ssk->sk_state != TCP_CLOSE))
return;
if (skb_queue_empty(&ssk->sk_receive_queue) &&
!test_and_set_bit(MPTCP_WORK_CLOSE_SUBFLOW, &msk->flags)) {
sock_hold(sk);
if (!schedule_work(&msk->work))
sock_put(sk);
}
}
static bool subflow_check_data_avail(struct sock *ssk)
{
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
@ -991,11 +1007,11 @@ static bool subflow_check_data_avail(struct sock *ssk)
}
if (status != MAPPING_OK)
return false;
goto no_data;
skb = skb_peek(&ssk->sk_receive_queue);
if (WARN_ON_ONCE(!skb))
return false;
goto no_data;
/* if msk lacks the remote key, this subflow must provide an
* MP_CAPABLE-based mapping
@ -1029,6 +1045,9 @@ static bool subflow_check_data_avail(struct sock *ssk)
}
return true;
no_data:
subflow_sched_work_if_closed(msk, ssk);
return false;
fatal:
/* fatal protocol error, close the socket */
/* This barrier is coupled with smp_rmb() in tcp_poll() */
@ -1413,6 +1432,8 @@ static void subflow_state_change(struct sock *sk)
if (mptcp_subflow_data_available(sk))
mptcp_data_ready(parent, sk);
subflow_sched_work_if_closed(mptcp_sk(parent), sk);
if (__mptcp_check_fallback(mptcp_sk(parent)) &&
!subflow->rx_eof && subflow_is_done(sk)) {
subflow->rx_eof = 1;