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mptcp: add subflow write space signalling and mptcp_poll

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Add new SEND_SPACE flag to indicate that a subflow has enough space to
accept more data for transmission.

It gets cleared at the end of mptcp_sendmsg() in case ssk has run
below the free watermark.

It is (re-set) from the wspace callback.

This allows us to use msk->flags to determine the poll mask.

Co-developed-by: Peter Krystad <peter.krystad@linux.intel.com>
Signed-off-by: Peter Krystad <peter.krystad@linux.intel.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Christoph Paasch <cpaasch@apple.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal
2020-01-21 16:56:25 -08:00
committed by David S. Miller
parent 648ef4b886
commit 1891c4a076
3 changed files with 57 additions and 0 deletions
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net/mptcp/protocol.h
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@@ -56,6 +56,7 @@
/* MPTCP socket flags */
#define MPTCP_DATA_READY BIT(0)
#define MPTCP_SEND_SPACE BIT(1)
/* MPTCP connection sock */
struct mptcp_sock {