mptcp: allow partial cleaning of rtx head dfrag (7948f6cc) · Commits · 戴 / test

After adding wmem accounting for the mptcp socket we could get into a situation where the mptcp socket can't transmit more data, and mptcp_clean_una doesn't reduce wmem even if snd_una has advanced because it currently will only remove entire dfrags. Allow advancing the dfrag head sequence and reduce wmem, even though this isn't correct (as we can't release the page). Because we will soon block on mptcp sk in case wmem is too large, call sk_stream_write_space() in case we reduced the backlog so userspace task blocked in sendmsg or poll will be woken up. This isn't an issue if the send buffer is large, but it is when SO_SNDBUF is used to reduce it to a lower value. Note we can still get a deadlock for low SO_SNDBUF values in case both sides of the connection write to the socket: both could be blocked due to wmem being too small -- and current mptcp stack will only increment mptcp ack_seq on recv. This doesn't happen with the selftest as it uses poll() and will always call recv if there is data to read. 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>

net/mptcp/protocol.c

+16 −0

Original line number	Diff line number	Diff line
		@@ -338,6 +338,7 @@ static bool mptcp_frag_can_collapse_to(const struct mptcp_sock *msk,
		static void dfrag_uncharge(struct sock *sk, int len)
		{
		sk_mem_uncharge(sk, len);
		sk_wmem_queued_add(sk, -len);
		}

		static void dfrag_clear(struct sock sk, struct mptcp_data_frag dfrag)
		@@ -364,8 +365,23 @@ static void mptcp_clean_una(struct sock *sk)
		cleaned = true;
		}

		dfrag = mptcp_rtx_head(sk);
		if (dfrag && after64(snd_una, dfrag->data_seq)) {
		u64 delta = dfrag->data_seq + dfrag->data_len - snd_una;

		dfrag->data_seq += delta;
		dfrag->data_len -= delta;

		dfrag_uncharge(sk, delta);
		cleaned = true;
		}

		if (cleaned) {
		sk_mem_reclaim_partial(sk);

		/* Only wake up writers if a subflow is ready */
		if (test_bit(MPTCP_SEND_SPACE, &msk->flags))
		sk_stream_write_space(sk);
		}
		}

net/mptcp/protocol.h

+10 −0

Original line number	Diff line number	Diff line
		@@ -190,6 +190,16 @@ static inline struct mptcp_data_frag mptcp_rtx_tail(const struct sock sk)
		return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
		}

		static inline struct mptcp_data_frag mptcp_rtx_head(const struct sock sk)
		{
		struct mptcp_sock *msk = mptcp_sk(sk);

		if (list_empty(&msk->rtx_queue))
		return NULL;

		return list_first_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
		}

		struct mptcp_subflow_request_sock {
		struct tcp_request_sock sk;
		u16 mp_capable : 1,

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