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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>
This commit is contained in:
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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12
net/mptcp/sockopt.c
View File

@@ -812,6 +812,16 @@ static int mptcp_setsockopt_sol_tcp(struct mptcp_sock *msk, int optname,
return 0;
case TCP_ULP:
return -EOPNOTSUPP;
case TCP_NOTSENT_LOWAT:
ret = mptcp_get_int_option(msk, optval, optlen, &val);
if (ret)
return ret;
lock_sock(sk);
WRITE_ONCE(msk->notsent_lowat, val);
mptcp_write_space(sk);
release_sock(sk);
return 0;
case TCP_CONGESTION:
return mptcp_setsockopt_sol_tcp_congestion(msk, optval, optlen);
case TCP_CORK:
@@ -1345,6 +1355,8 @@ static int mptcp_getsockopt_sol_tcp(struct mptcp_sock *msk, int optname,
return mptcp_put_int_option(msk, optval, optlen, msk->cork);
case TCP_NODELAY:
return mptcp_put_int_option(msk, optval, optlen, msk->nodelay);
case TCP_NOTSENT_LOWAT:
return mptcp_put_int_option(msk, optval, optlen, msk->notsent_lowat);
}
return -EOPNOTSUPP;
}