mptcp: implement TCP_NOTSENT_LOWAT support

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Add support for such socket option storing the user-space provided
value in a new msk field, and using such data to implement the
_mptcp_stream_memory_free() helper, similar to the TCP one.

To avoid adding more indirect calls in the fast path, open-code
a variant of sk_stream_memory_free() in mptcp_sendmsg() and add
direct calls to the mptcp stream memory free helper where possible.

Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/464
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Mat Martineau <martineau@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Paolo Abeni 2024-03-01 18:43:46 +01:00 • committed by David S. Miller

parent a74762675f

commit 29b5e5ef87

3 changed files with 73 additions and 6 deletions

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39

net/mptcp/protocol.c

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28

net/mptcp/protocol.h

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12

net/mptcp/sockopt.c

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