mptcp: re-enable sndbuf autotune

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After commit 6e628cd3a8 ("mptcp: use mptcp release_cb for
delayed tasks"), MPTCP never sets the flag bit SOCK_NOSPACE
on its subflow. As a side effect, autotune never takes place,
as it happens inside tcp_new_space(), which in turn is called
only when the mentioned bit is set.

Let's sendmsg() set the subflows NOSPACE bit when looking for
more memory and use the subflow write_space callback to propagate
the snd buf update and wake-up the user-space.

Additionally, this allows dropping a bunch of duplicate code and
makes the SNDBUF_LIMITED chrono relevant again for MPTCP subflows.

Fixes: 6e628cd3a8 ("mptcp: use mptcp release_cb for delayed tasks")
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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This commit is contained in:

Paolo Abeni 2021-01-20 15:39:11 +01:00 • committed by Jakub Kicinski

parent 866f26f2a9

commit 5cf92bbadc

3 changed files with 45 additions and 33 deletions

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52

net/mptcp/protocol.c

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19

net/mptcp/protocol.h

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7

net/mptcp/subflow.c

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