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mptcp: add rmem queue accounting

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If userspace never drains the receive buffers we must stop draining
the subflow socket(s) at some point.

This adds the needed rmem accouting for this.
If the threshold is reached, we stop draining the subflows.

Signed-off-by: Florian Westphal <fw@strlen.de>
Reviewed-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 2020-02-26 10:14:49 +01:00 committed by David S. Miller
parent 6771bfd9ee
commit 600911ff5f
1 changed files with 17 additions and 1 deletions
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18
net/mptcp/protocol.c
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@ -124,7 +124,7 @@ static void __mptcp_move_skb(struct mptcp_sock *msk, struct sock *ssk,
struct sock *sk = (struct sock *)msk;
__skb_unlink(skb, &ssk->sk_receive_queue);
skb_orphan(skb);
skb_set_owner_r(skb, sk);
__skb_queue_tail(&sk->sk_receive_queue, skb);
msk->ack_seq += copy_len;
@ -136,10 +136,16 @@ static bool __mptcp_move_skbs_from_subflow(struct mptcp_sock *msk,
unsigned int *bytes)
{
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
struct sock *sk = (struct sock *)msk;
unsigned int moved = 0;
bool more_data_avail;
struct tcp_sock *tp;
bool done = false;
int rcvbuf;
rcvbuf = max(ssk->sk_rcvbuf, sk->sk_rcvbuf);
if (rcvbuf > sk->sk_rcvbuf)
sk->sk_rcvbuf = rcvbuf;
tp = tcp_sk(ssk);
do {
@ -183,6 +189,11 @@ static bool __mptcp_move_skbs_from_subflow(struct mptcp_sock *msk,
WRITE_ONCE(tp->copied_seq, seq);
more_data_avail = mptcp_subflow_data_available(ssk);
if (atomic_read(&sk->sk_rmem_alloc) > READ_ONCE(sk->sk_rcvbuf)) {
done = true;
break;
}
} while (more_data_avail);
*bytes = moved;
@ -196,9 +207,14 @@ void mptcp_data_ready(struct sock *sk)
set_bit(MPTCP_DATA_READY, &msk->flags);
/* don't schedule if mptcp sk is (still) over limit */
if (atomic_read(&sk->sk_rmem_alloc) > READ_ONCE(sk->sk_rcvbuf))
goto wake;
if (schedule_work(&msk->work))
sock_hold((struct sock *)msk);
wake:
sk->sk_data_ready(sk);
}